JP5000223B2 - Compressor control device and coal gasification power generation system - Google Patents

Description

  The present invention relates to a compressor control device and a coal gasification power generation system for pumping air, fuel gas, inert gas and the like in an energy / petrochemical plant such as a coal gasification power generation system.

As shown in FIG. 16, as a control device for a compressor that compresses gas, an inflow amount adjusting means 95 that adjusts an inflow amount of fuel gas to the compressor 1, and a fuel gas discharged from the compressor 1 as a compressor 1 and a control operation value for operating the compressor 1 at a predetermined operating point. Based on the control operation value, the inflow rate adjusting means 95 and the recycle valve 4 are set. Control means for controlling, and when the control operation value is greater than or equal to a predetermined value, the control means generates a signal that increases as the operation value increases as a control signal for the inflow amount adjustment means 95. Control signal generating means 96, and a second control signal generating means 97 for generating a signal that decreases as the operation value increases as a control signal for the recycle valve 4 when the control operation value is less than a predetermined value. , Having It proposed.
In addition, 7 is a header tank, 5 is a check valve, 6 is an on-off valve (shutoff valve), PC is a pressure regulator, FC is a flow regulator, HS is a high-level selector, and the set pressure is the pressure regulator PC. (For example, Patent Document 1).

  However, in the one described in Patent Document 1, when the relationship between the opening degree of the inflow amount adjusting means 95 and the inflow amount of the fuel gas to the compressor 1 does not have linearity, the fuel with respect to the change in the control operation amount of the pressure regulator PC There is a problem that the change in gas inflow amount varies depending on the opening degree of the inflow amount adjusting means 95, which may make it difficult to control the pressure.

In addition, a gasification furnace that generates a combustible gas by bringing a fossil fuel and a gasifying agent into contact with each other, a gas turbine that generates power by rotating a turbine by combustion of the combustible gas, and a gas turbine air compressor are partially extracted. There has been proposed a gasification power generation system provided with a bleed air system line that supplies the air as a gasifying agent to the gasification furnace using a bleed air compressor (for example, Patent Document 2).
However, in Patent Document 2, when the load of the gas turbine largely fluctuates, the amount of air flowing into the extraction air compressor also changes, so it is necessary to control each valve in the extraction air compressor. Control in the case where the relationship between the opening degree of the valves and the inflow amount of air to the compressor is not linear is not disclosed, and the control of the extraction air compressor may be difficult.

JP 2005-76461 A JP-A-10-251669

  The present invention is intended to solve the problem of the above-described configuration, and provides linearity in the relationship between the opening of the inflow adjustment means and the inflow of gas such as fuel gas to the compressor. An object of the present invention is to provide a compressor control device and a coal gasification power generation system capable of easily controlling pressure.

  In order to solve the above problems, the present invention aims to solve the problems by the following means.

(1) The coal gasification power generation system of the first means is:
A gasification furnace for generating a combustible gas by bringing a fossil fuel and a gasifying agent into contact with each other, a gas turbine for generating electric power by rotating a turbine by combustion of the combustible gas, and a gas turbine air compressor driven by the gas turbine An extraction air line for supplying a part of the air extracted from the gasification furnace as a gasifying agent, a raw material air compressor for introducing the atmosphere, and an air separation device connected to the raw material air compressor; A nitrogen supply line for introducing a part of the nitrogen separated in the air separation device into the gasification furnace and introducing the remaining nitrogen into a system system between the gasification furnace and the gas turbine;
In a coal gasification power generation system having an oxygen-enriched air supply line for mixing separated oxygen into the extracted air line,
A compressor having a compressor, an IGV disposed on a suction side of the compressor, a recycle line connecting a discharge side and a suction side of the compressor, and a recycle valve provided in the recycle line A control device is provided in the extraction air line; and
The control device of the compressor is
A valve operation correction value based on a supply pressure measurement value measured by a header tank pressure gauge that measures a supply flow rate command value to the compressor, a supply pressure set value, and a header tank pressure connected to the downstream side of the compressor A valve opening calculation unit for calculating
The valve operation correction value is received from the valve opening calculation unit, and when the valve operation correction value is greater than or equal to a predetermined split point, the valve operation correction value increases as the valve operation correction value increases, and is less than or equal to the split point. An adjusted flow function generator for calculating an IGV opening command value, which is sometimes a predetermined lower limit value of the flow adjustment opening;
In order to control the opening degree of the IGV so that the IGV opening degree command value is input from the control flow function generator and the flow rate actually flowing through the compressor is in a proportional relationship. A non-linear valve opening function generator for calculating the IGV opening command correction value of
Receiving the valve operation correction value from the valve opening calculation unit, calculating a recycle valve opening command value that decreases as the valve operation correction value increases when the valve operation correction value is less than a predetermined split point A recycle valve opening function generator that outputs the recycle valve control signal;
It is provided with.

(2) The compressor control device of the second means is:
A compressor having a compressor, an IGV disposed on a suction side of the compressor, a recycle line connecting a discharge side and a suction side of the compressor, and a recycle valve provided in the recycle line In the control device,
A valve operation correction value based on a supply pressure measurement value measured by a header tank pressure gauge that measures a supply flow rate command value to the compressor, a supply pressure set value, and a header tank pressure connected to the downstream side of the compressor A valve opening calculation unit for calculating
Comparator for calculating a supply pressure set value / inlet pressure measurement value ratio that is a ratio between the supply pressure set value and an inlet pressure measurement value measured by an inlet bleed air pressure gauge that measures the pressure downstream of the compressor When,
An opening command lower limit value calculator that receives a supply pressure set value / inlet pressure measurement value ratio from the comparator and calculates an opening command lower limit value that increases in accordance with the supply pressure set value / inlet pressure measurement value ratio; ,
A split point calculator for receiving a supply pressure set value / inlet pressure measured value ratio from the comparator and calculating a split point that increases in accordance with the supply pressure set value / inlet pressure measured value ratio;
The valve operation correction value is received from the valve opening calculation unit, the opening command lower limit value is received from the opening command lower limit calculator, the split point is received from the split point calculator, and An adjustment flow rate that calculates an IGV opening command value that increases as the valve operation correction value increases when the valve operation correction value is equal to or greater than the split point and that is the opening command lower limit value when the valve operation correction value is equal to or less than the split point. A function generator;
In order to control the opening degree of the IGV so that the IGV opening degree command value is input from the control flow function generator and the flow rate actually flowing through the compressor is in a proportional relationship. A non-linear valve opening function generator for calculating the IGV opening command correction value of
The valve operation correction value is received from the valve opening calculation unit, the split point is received from the split point calculator, and the valve operation correction value increases when the valve operation correction value is less than the split point. A recycle valve opening function generator that calculates a recycle valve opening command value that decreases along with the recycle valve opening command value and outputs the recycle valve control signal;
It is provided with.

(3) The coal gasification power generation system of the third means is
A gasification furnace for producing a combustible gas by contacting a fossil fuel with a gasifying agent;
A gas turbine that generates electricity by rotating the turbine by burning combustible gas; and
A bleed air line for supplying air partially extracted from a gas turbine air compressor driven by the gas turbine as a gasifying agent to the gasification furnace;
An air compressor for raw materials that introduces the atmosphere;
An air separation device connected to the raw material air compressor;
A nitrogen supply line for introducing a part of nitrogen separated in the air separation device into the gasification furnace and introducing the remaining nitrogen into a system system between the gasification furnace and the gas turbine;
In a coal gasification power generation system having an oxygen-enriched air supply line for mixing separated oxygen into the extracted air line,
The bleed air line is provided with a compressor control device of the first or second means.

  The invention according to each claim described in the claims employs each of the above-described means, and the compressor and the IGV must be installed at locations distant from each other. In the case where the nonlinearity with the actual flow rate increases and the control of the compressor is hindered, the linearity of the flow rate and the IGV opening can be provided, and the control performance can be improved.

(Overall configuration of coal gasification combined cycle system)
Hereinafter, a compressor control device and a coal gasification combined power generation system according to embodiments of the present invention will be described.
FIG. 1 is an overall configuration diagram of a combined coal gasification combined power generation system employing a compressor control device according to each embodiment of the present invention.
FIG. 2 is a schematic diagram of a control device of the coal gasification combined power generation system of FIG.

First, the overall configuration of a combined coal gasification combined power generation system employing a compressor control device according to each embodiment of the present invention will be described with reference to FIG.
The overall configuration of the combined coal gasification combined power generation system shown in FIG. 1 is similar to that disclosed in Japanese Patent Laid-Open No. 10-251669 (Patent Document 2) except for the extraction air compressor 64.
As shown in FIG. 1, the coal gasification combined system includes a gasification furnace 51, a generated gas cooler 52, a cyclone 53 and a porous filter 54 that are arranged in the annulus 51 a in order from the upstream side. The desulfurization device 56 and the gas turbine 57 are arranged in this order.

A pulverized coal supply device 58 (mill) is disposed on the upstream side of the gasification furnace 51.
The raw coal is introduced into the pulverized coal supply device 58 (mill) from the raw coal supply line 101 and is pulverized by the pulverization roller at the lower part of the pulverized coal supply device 58.
The pulverized pulverized coal is conveyed by nitrogen gas (inert gas) from the compressed air line 108, and pulverized coal having a predetermined particle diameter or less is selected and sorted by the rotary separator at the top of the pulverized coal supply device 58. The pulverized coal passes through the pulverized coal conveyance line 102 and is supplied to the gasification furnace 51.
The gasification furnace 51 causes the pulverized coal supply device 58 to contact the pulverized coal with a gasifying agent such as oxygen in the extracted air described later.
The gasification furnace 51 combusts and gasifies the pulverized coal at a high temperature of 1500 to 2000 ° C. to generate a combustible gas, and discharges it to the product gas cooler 52.
At this time, the slag generated in the gasification furnace 51 is discharged from a slag discharge line 109 below the gasification furnace 51.

In the product gas cooler 52, the high-temperature combustible gas including the introduced carbon monoxide, hydrogen gas, methane gas, etc. is cooled to recover heat, and the cooled combustible gas is sent to the dust removing device 55 on the downstream side. Discharged.
In the dedusting device 55, coarse particles of solid unreacted char contained in the combustible gas are dedusted by the cyclone 53, and fine particles that could not be dedusted by the cyclone 53 are dedusted by the porous filter 54.
Here, the char separated from the combustible gas is collected in the gasification furnace 51 through the char supply line 113 and reused.
On the other hand, the combustible gas dedusted by the dedusting device 55 is discharged to the desulfurization device 56.
In the desulfurization device 56, sulfur contained in the combustible gas is separated.

And the combustible gas discharged | emitted from the desulfurization apparatus 56 is supplied to the combustion part 57b through the combustible gas supply line 103. FIG.
In the combustion part 57b, the combustible gas discharged | emitted from the desulfurization apparatus 56 is mixed with the compressed air from the gas turbine air compressor 57a, and combusts.
The combustion gas that has been combusted and expanded is discharged to the gas turbine 57.
The gas turbine 57 is rotated by the combustion gas that has been combusted and expanded, drives a generator 57c that is connected to the shaft, and generates power by the generator 57c.
The exhaust heat recovery boiler 61 disposed on the downstream side of the gas turbine 57 generates steam by the heat of the high-temperature combustion gas introduced from the gas turbine 57, and this steam passes through the steam discharge line 111 to be a steam turbine. To 62.
The steam turbine 62 is rotated by the steam discharged from the exhaust heat recovery boiler 61 and the steam discharged from the product gas cooler 52 via the condensate evaporation line 112, and a generator 62a connected to the generator 62a. And the generator 62a generates power.

The steam discharged from the steam turbine 62 is cooled by the cooler 62b and sent to the product gas cooler 52 by the condensate pump 62c.
A part of the compressed air compressed by the gas turbine air compressor 57a is introduced into the extraction air line 104a.
An upstream regeneration heat exchanger 59, an extraction air compressor 64, a downstream regeneration heat exchanger 60, an extraction air control valve 74, and a flow meter 79 are interposed in the extraction air lines 104a and 104b.
Then, a part of the compressed air compressed by the gas turbine air compressor 57a passes through the upstream regeneration heat exchanger 59, is further compressed by the extraction air compressor 64, passes through the downstream regeneration heat exchanger 60, The gasification furnace 51 is introduced through the gasifying agent supply line 107.
The bleed air compressor 64 is composed of the compressor 1, the prime mover 2, the IGV 3, the header tank 7, and the like, details of which will be described later.

The coal gasification combined power generation system is also provided with a raw material air compressor 65, an air separation device 63, and the like.
The air separation device 63 is a device that separates nitrogen and oxygen contained in air.
The air separation device 63 is connected to a raw material air compressor 65 for sucking air from the atmosphere outside the power generation system so as to suck air.
Of the air separated by the air separation device 63, nitrogen gas is discharged to the nitrogen supply line 106, and oxygen is discharged to the oxygen-enriched air supply line 105.

A part of the air compressed by the gas turbine air compressor 57a is conveyed to the extraction air compressor 64, and the remaining air is conveyed to the combustion unit 57b.
Therefore, the amount and pressure of the bleed air flowing into the bleed air compressor 64 vary greatly depending on the operating conditions of the combustion unit 57b, the gas turbine 57, and the generator 57c.
Therefore, the bleed air compressor 64 is provided with the IGV 3, the recycle valve 4, and the like so as to adjust the pressure conveyed to the gasification furnace 51.
On the other hand, the air compressor 65 for raw materials, the nitrogen compressor 66, the oxygen compressor 67, and the high-pressure nitrogen gas compressor 68 are for introducing air from the atmosphere, compressing and transporting it. There is no need, and the installation position in the coal gasification combined power generation system is also flexible.

In the nitrogen supply line 106, the nitrogen gas is compressed by the nitrogen compressor 66 and discharged to the downstream side, and then branches in two directions.
That is, a part of the nitrogen gas is further compressed by the high-pressure nitrogen gas compressor 68 and then supplied to the pulverized coal supply device 58 through the pressurized air line 108 in which the nitrogen control valve 70 is interposed. The gas is supplied to the gasification furnace 51 through the pressurization line 110 in which the valve 71 is interposed.
Note that the nitrogen gas supplied to the pulverized coal supply device 58 is used as a transport medium or the like when the pulverized coal is transported to the gasification furnace 51.
The remaining nitrogen gas passes through the nitrogen gas addition line 114 in which the nitrogen control valve 72 is interposed, and is sent to the downstream side of the product gas cooler 52 in the system.
In this way, an amount of nitrogen gas is introduced into the system so that the oxygen concentration to the gasification furnace 51 is optimal.
Note that flow meters 75, 76, and 77 are disposed in the pressurized air line 108, the pressurized line 110, and the nitrogen gas addition line 114, respectively.

The oxygen-enriched air separated by the air separation device 63 passes through the oxygen-enriched air supply line 105, is compressed by the oxygen compressor 67, and is discharged to the downstream side. It is mixed with the bleed air in the bleed air line 104b via the flow meter 78.
In this case, the mixing may be performed in the middle of the extraction air line 104b or the burner tip of the gasification furnace 51.

(Control of coal gasification combined cycle system)
Next, based on FIG. 2, the control of the combined coal gasification combined power generation system employing the compressor control device according to each embodiment of the present invention will be described.
Note that the control of the coal gasification combined power generation system shown in FIG. 2 is similar to that disclosed in Japanese Patent Laid-Open No. 10-251669 (Patent Document 2).
The air supply control panel 41 shown in FIG. 2 includes the extraction air lines 104a and 104b, the nitrogen supply line 106, the oxygen-enriched air supply line 105, the pressurized air line 108, the pressurization line 110, and the nitrogen gas addition line 114. This is for controlling the flow rate, and controls the flow rate of each gas flowing through the control valves 70 to 73 and the extraction air control valve 74 provided in the extraction air line 104b described above and later.
Flow lines 75 to 79 for detecting the flow rate of each gas or bleed air flowing through the pipe line are provided in the pipe line of each line in which these control valves are provided.

The air supply control panel 41 includes a turbine control panel 42 that controls the generators 57c and 62a, a raw coal pulverizer control panel 46 that controls the pulverized coal supply device 58, and an extraction air compressor that controls the extraction air compressor 64. Connected to control panel 45a (45b), compressor control panels 43a to 43d for controlling the respective compressors 65 to 68, nitrogen control valves 70, 71 and 72, and valve control panels 44a to 44d for controlling the oxygen control valves 73 and 74 Has been.
The char supply line 113 is also provided with a flow meter 80 for detecting the char flow rate and a control valve 81, and a valve control panel 44e for controlling this is connected to the air supply control panel 41 to control the char flow rate. is doing.
The air supply control panel 41 and the like are connected to the central monitoring control panel 40.

With such a configuration, the coal gasification combined power generation system allows the air compressed by the gas turbine air compressor 57a to be cooled by the regenerative heat exchanger 59 and compressed by the extraction air compressor 64, and then regenerated heat exchange again. It passes through the vessel 60 and is discharged to the gasification furnace 51 side.
At this time, oxygen separated by the air separation device 63 is mixed with the air in the extraction air line 104b through the oxygen-enriched air supply line 105.
At this time, the flow meter 78 disposed in the oxygen-enriched air supply line 105 detects the flow rate of oxygen gas, and the flow meter 79 disposed in the extraction air line 104b detects the extraction air flow rate.
Then, the air supply control panel 41 adjusts the throttle amount of the oxygen control valve 73 and the extraction air control valve 74, and mixes the gas containing oxygen and nitrogen into the gasification furnace 51 at a preferable mixing ratio as a gasifying agent. Introduce.
Thereby, combustible gas is efficiently generated.

  On the other hand, in the nitrogen supply line 106, the air supply control panel 41 similarly detects the flow rate of nitrogen gas with the flow meters 75, 76, 77, adjusts the throttle amount of the nitrogen control valves 70, 71, 72, and controls the nitrogen control valve. 70 and 71 are adjusted to a suitable throttle amount for the pulverized coal and char pumping air line 108 or the pressurizing line 110, and the nitrogen control valve 72 has a mixing ratio of all these nitrogen and oxygen. The throttle amount is adjusted so as to be suitable and returned to the nitrogen gas addition line 114.

Needless to say, each measurement value or output signal transmitted from each measurement device or each operation panel described above is converted into a commonly used predetermined electrical signal.
Further, each of the control panels described above is in the form of an integral or separate computer, and each function generator, arithmetic unit, etc. in each control panel is in the form of a program, sequence block, or memory for executing it. However, the present invention is not limited to this, and may be configured by individual electric circuits.

(Configuration and Control of Extraction Air Compressor of First Embodiment)
Next, based on FIGS. 3-9, the control apparatus of the extraction air compressor in the 1st Embodiment of this invention is demonstrated.
FIG. 3 is a configuration diagram of the extraction air compressor 64 according to the first embodiment of the present invention.
FIG. 4 is a characteristic diagram illustrating the relationship between the supply flow rate command value SV1 and the supply pressure set value SV2 in the command value function generator 22 of FIG. 3 using the valve operation value MV1 as a parameter.
FIG. 5 is a graph illustrating the relationship between the supply flow rate command value SV1 and the valve operation value MV1 in the command value function generator 22 of FIG.
FIG. 6 is a graph illustrating a function of the valve operation correction value MV3 and the IGV opening command value MV4 in the adjusted flow rate function generator 24 of FIG.
FIG. 7 is a graph illustrating the relationship between the IGV opening command value MV4 and the IGV opening command correction value MV6 in the nonlinear opening function generator 25.
FIG. 8 is a graph illustrating a function of the valve operation correction value MV3 and the recycle valve opening command value MV5 in the recycle valve opening function generator 26 of FIG.
FIG. 9 is a diagram showing an operating state in the first embodiment of the present invention.

In the combined coal gasification combined power generation system shown in FIG. 1 described above, since the air supply source to the raw material air compressor 65 is the atmosphere, operating conditions such as pressure and flow rate on the inlet side of the raw material air compressor 65 are as follows. Almost no change.
The nitrogen compressor 66, the oxygen compressor 67, and the high-pressure nitrogen gas compressor 68 are also connected to the downstream side of the raw material air compressor 65 and are the same.
However, the supply source of the bleed air compressor 64 is the gas turbine air compressor 57a, which varies greatly depending on the output of the gas turbine 57 and the generator 57c connected to the gas turbine air compressor 57a.
Therefore, it is necessary to control the extraction air compressor 64 according to the output of the gas turbine 57 and the generator 57c that fluctuate greatly.

In general, when the flow rate is controlled by IGV (inlet guide vane or inlet guide vane / hereinafter referred to as “IGV”), if the IGV is closed (the opening degree is reduced), the pressure loss is reduced. The opening degree and the actual flow rate are not proportional, and there is no nonlinearity.
However, when the IGV and the compressor are arranged close to each other, a swirling flow (a flow like a spiral) is generated at the IGV outlet, and due to this effect, the opening degree of the IGV and the actual flow rate are linear. In other words, the non-linearity is hardly a problem in practical use.

However, in the case of the extraction air compressor 64 in the coal gasification combined power generation system, it is disposed in the extraction air lines 104a and 104b between the gas turbine air compressor 57a, the regenerative heat exchangers 59 and 60, and the pulverized coal supply device 58. For this reason, the compressor 1 and the IGV 3 may have to be installed at locations distant from each other.
In this case, the non-linearity between the opening of the IGV 3 and the flow rate that actually flows increases, which hinders the control of the IGV 3.
Therefore, it is necessary to correct and control this nonlinearity.

First, the configuration of the extraction air compressor 64 will be described with reference to FIG.
As shown in FIG. 3, a bleed air line 104a (pipe) is connected to the gas turbine air compressor 57a via a regenerative heat exchanger 59 (not shown in FIG. 3) shown in FIG. Yes.
This bleed air line 104a is connected to a compressor suction line 9 (piping), and the compressor suction line 9 is connected to the suction port of the compressor 1 via an IGV 3 as an inflow amount adjusting means for adjusting the inflow of the bleed air. It is connected.
The rotary shaft of the compressor 1 is connected to a prime mover (motor) 2 such as a steam turbine or an electric motor via a clutch (not shown).
In the present embodiment, the IGV 3 is not disposed in the vicinity of the suction port of the compressor 1, and the IGV 3 and the suction port of the compressor 1 are disposed away from each other, or the IGV 3 and the compression are compressed. The compressor suction line 9 between the suction port of the machine 1 is bent.
As described above, the various conditions (inlet fluid pressure, etc.) of the extracted air supplied from the gas turbine air compressor 57a vary greatly depending on the outputs of the gas turbine 57 and the generator 57c.

The discharge port of the compressor 1 is connected to the inlet of the header tank 7 via the compressor discharge line 10 (pipe), the check valve 5, the shutoff valve 6, and the header tank supply line 12 (pipe).
The outlet of the header tank 7 is connected to the gasification furnace 51 by a bleed air line 104b via a regenerative heat exchanger 60 (not shown in FIG. 3) shown in FIG.
The junction between the compressor discharge line 10 and the header tank supply line 12 and the junction between the compressor suction line 9 and the bleed air line 104a are a recycle valve 4 [or a return valve or RCV (Recycle Valve). )] Is connected by a recycle line 11 (also referred to as return pipe or bypass pipe).

The recycle valve 4 also has an anti-surge control function, and when the compressor 1 enters a surging state, the recycle valve 4 has a function of opening and reducing the discharge pressure in order to quickly escape from that state.
For this reason, the recycle valve 4 is superior in responsiveness and control accuracy compared to the IGV 3.

In the above-described configuration, the extracted air supplied from the gas turbine air compressor 57a passes through the extracted air line 104a, the IGV 3 and the compressor intake line 9, and is sucked and compressed by the compressor 1.
The bleed air compressed by the compressor 1 is stored in the header tank 7 through the compressor discharge line 10, the check valve 5, the shutoff valve 6 and the header tank supply line 12.
The header tank 7 has a function of mitigating fluctuations in the abrupt pressure, flow rate, etc. of the extracted air.
The extracted air in the header tank 7 is supplied to the gasification furnace 51 through the extracted air line 104b and the like.
In addition, the header which measures the pressure of the extraction air in the header tank 7 in the header tank 7 or the header tank 7 vicinity of the header tank supply line 12, and outputs the supply pressure measured value PV1 to the demand destination of the gasification furnace 51 is output. A tank pressure gauge 8 is attached.

During the operation of the extraction air compressor 64, the measurement value of the above-described header tank pressure gauge 8 is transmitted to the extraction air compressor control panel 45a via a signal wire.
On the other hand, the command value function generator 22 of the extraction air compressor control panel 45a is supplied from the air supply control panel 41 (or the central monitoring control panel 40) as the discharge flow rate of the extraction air necessary for the gasification furnace 51. A flow rate command value SV1 is transmitted.

Next, calculation contents in the command value function generator 22 of the extraction air compressor control panel 45a will be described with reference to FIGS.
In the command value function generator 22, the supply flow rate command value SV1 transmitted from the air supply control panel 41 (or the central monitoring control panel 40) and the pressure setter 21 in the extraction air compressor control panel 45a are transmitted. Based on the supply pressure set value SV2, the valve operation value MV1 is calculated by the function shown in FIG.
That is, in FIG. 4, the pressure flow characteristic curves a, b, and c illustrate the relationship between the discharge flow rate and the discharge pressure of the compressor 1 when the opening degree of the IGV 3 is 20%, 50%, and 100%, respectively. is there.
According to this relationship, when the supply pressure set value SV2 transmitted and stored from the air supply control panel 41 to the pressure setter 21 is P1 and the supply flow rate command value SV1 is F1, the valve operation value MV1 of the IGV3 is 50%. By setting to, the compressor 1 is operated at the operating point A1.

When the supply flow rate command value SV1 decreases, the opening degree of the IGV3 is decreased, and the discharge flow rate of the extraction air is reduced to an amount commensurate with the supply flow rate command value SV1.
However, IGV3 has a low control accuracy below a certain opening due to its structure.
For this reason, in this first embodiment, as will be described later, the minimum opening command value of IGV3 that enables accurate flow rate control by IGV3 (in this example, the minimum opening that is 20% opening). Degree command value) is set so that the opening of the IGV 3 does not become smaller than the minimum opening.

If the minimum opening command value is set, the discharge flow rate cannot be reduced after the IGV 3 reaches this minimum opening.
Therefore, as will be described later, when the IGV 3 reaches the minimum opening, the opening is maintained and a part of the extracted air discharged from the compressor 1 is extracted via the recycle valve 4 to the extracted air line. It is made to return to the 104a side.

That is, if the required discharge flow rate of the bleed air is, for example, F2 shown in FIG. 4, depending on the IGV3, the discharge flow rate can be reduced only to the discharge flow rate F3 (> F2) based on the opening 20%. The recycle valve 4 is opened so that the amount of extracted air corresponding to F3-F2 is returned to the extracted air line 104a, that is, recycled.
Thereby, the extracted air having the required flow rate F2 is supplied to the gasification furnace 51 side.
In this case, the operating point of the compressor 1 is A3 instead of A2.
The relationship between the supply flow rate command value SV1 and the valve operation value MV1 based on FIG. 4 described above is a function as shown in FIG.
In this manner, the valve operation value MV1 calculated by the command value function generator 22 is transmitted to the opening command adder 23.

In the opening command adder 23, the valve operation value MV1 transmitted from the command value function generator 22 and the correction operation value MV2 transmitted from the pressure regulator 27 described later are added to obtain the valve operation correction value MV3. Then, the valve operation correction value MV3 is transmitted to the adjusted flow rate function generator 24 and the recycle valve opening function generator 26.
The valve operation correction value MV3 obtained by the opening degree command adder 23 is substantially the same as the valve operation value MV1 for feedback control during the steady operation of the compressor 1.
That is, during steady operation, the supply pressure measurement value PV1, which is the pressure in the header tank 7, is transmitted from the air supply control panel 41 to the pressure setter 21 and kept at the stored supply pressure set value SV2. In addition, since the amount of the extracted air flowing into the header tank 7 and the amount of the extracted air flowing out are constant, the correction operation value MV2 is almost zero.

Next, the correction operation value MV2 for feedforward control input to the opening command adder 23 will be described.
A pressure setting device 21 is disposed in the valve opening calculation unit 20a of the extraction air compressor control panel 45a.
In the pressure setting device 21, the supply pressure set value SV 2 of the extracted air supplied to the gasification furnace 51 is transmitted from the air supply control panel 41 and stored.
The supply pressure set value SV2 is input to the pressure regulator 27.

On the other hand, the supply pressure measurement value PV <b> 1 measured by the header tank pressure gauge 8 is also input to the pressure regulator 27.
In the pressure regulator 27, a PI (proportional, integral) calculation process is performed based on the deviation between the supply pressure set value SV2 and the supply pressure measurement value PV1, and a correction operation value MV2 is calculated by the following equation. This correction operation value MV2 Is output to the opening command adder 23 as an operation signal for feedback control.
Correction operation value MV2 = K1 · (SV2−PV1) + K2 · ∫ (SV2−PV1) dt
K1 and K2 are coefficients.

  As described above, the supply flow rate command value SV1, the supply pressure set value SV2, and the header tank pressure from the air supply control panel 41 by the command value function generator 22, the opening degree command adder 23, the pressure setter 21 and the pressure regulator 27. A valve opening calculation unit 20a that calculates the valve operation correction value MV3 based on the supply pressure measurement value PV1 from the total 8 is configured.

The adjusted flow rate function generator 24 sets the IGV opening command value MV4 to a predetermined lower limit value when the valve operation correction value MV3 is equal to or less than a predetermined split point (for example, 50%) based on the function illustrated in FIG. If the valve operation correction value MV3 is 50% or more, the IGV opening command value MV4 that linearly increases as the valve operation correction value MV3 increases is calculated.
The calculated IGV opening command value MV4 is transmitted to the nonlinear valve opening function generator 25.

In the nonlinear valve opening function generator 25, a correction function as shown in FIG. 7 is set (or stored) in advance.
The correction function set (or stored) in the nonlinear valve opening function generator 25 is a function specific to each coal gasification combined power generation system. It is preset by the turbine air compressor 57a, the regenerative heat exchangers 59 and 60, the positional relationship between the compressor 1 and the IGV 3, the shapes of the extraction air lines 104a and 104b, and the like.

The correction function is calculated by, for example, installing a flow meter in the compressor suction line 9 or the compressor discharge line 10, and comparing the flow rate measurement value from the flow meter with the actual opening value of the IGV3. Alternatively, feedback control can be considered.
However, the correction based on the measured flow rate value and the actual measured opening value of IGV3 not only makes the structure complicated, but also controls the linearity more than necessary, and the control is unstable. There is a possibility.
Further, the opening degree and flow rate of the IGV 3 originally have a certain degree of nonlinearity, and it is not necessary to perform control with strictly linearity in the control.

Next, the correction function shown in FIG. 7 will be described in detail.
The relationship between the flow rate Q (Am ³ / h) and the inlet / outlet pressure ratio (Pd / Ps) when the opening degree of the IGV 3 is 5%, 30%, and 100% is as shown in FIG.
The relationship between the normalized flow rate with the opening amount of IGV3 and the flow rate Q at 100% opening degree of IGV3 as 100% is compared with the characteristic curve Ls which is substantially proportional as shown in FIG. 7B. Thus, the characteristic curve Ln having a strong non-linearity is provided.
The IGV opening command value MV4 and the normalized flow rate are equivalent, and the relationship between the IGV opening command value MV4 and the IGV opening command correction value MV6 is as shown in FIG. 7 (b) is a graph in which the horizontal axis and the vertical axis are interchanged.

In the case of the graph of FIG. 7C, when the IGV opening command value MV4 is 40%, 90%, and 100%, the IGV opening command correction value MV6 is 5%, 30%, and 100%, respectively. And the opening degree of the IGV 3 is controlled.
The preset (or stored) correction function may be (0, 0), (40%, 5% ± 1%), (90) even if it has a polygonal line shape as shown in FIG. %, 30% ± 6%), and (100%, 100%) may be approximate curves connecting four points.
Further, as described above, in the values of these four points, an increase / decrease of about 20% is within an allowable range.

That is, in the nonlinear valve opening function generator 25, the IGV opening command value MV4 is input from the adjusted flow function generator 24, and the IGV opening command value MV4 and the flow rate actually flowing through the compressor 1 are the same. The IGV opening command correction value MV6 for controlling the opening of the IGV3 is calculated so as to have a proportional relationship.
In this case, the nonlinear valve opening function generator 25 has a relational expression (or graph) showing the relationship between the IGV3 opening command value (MV4) and the IGV opening command correction value (MV6) shown in FIG. ) Is set and stored in advance (in other words, pre-installed in the processing program or sequence).
Thus, IGV3 is controlled by the IGV opening command correction value MV6 calculated by the nonlinear valve opening function generator 25.

On the other hand, the valve operation correction value MV3 is input to the recycle valve opening function generator 26 from the opening command adder 23 of the valve opening calculator 20a.
Then, in the recycle valve opening function generator 26, based on the function illustrated in FIG. 8, the recycle valve 4 opening is changed from 100% to 0% until the valve operation correction value MV3 becomes 0% to 50%. When the valve operation correction value MV3 decreases linearly and the valve operation correction value MV3 is 50% or more, a recycle valve opening command value MV5 for maintaining the recycle valve 4 opening at 0% is calculated.
The recycle valve 4 is controlled based on the calculated recycle valve opening command value MV5.

(Operation of the extraction air compressor control panel 45a)
The operation of the extracted air compressor control panel 45a according to the first embodiment of the present invention will be described below.
The supply flow rate command value SV1 transmitted from the air supply control panel 41 (or the central monitoring control panel 40) is input to the command value function generator 22.
In the command value function generator 22, when the supply flow rate command value SV1 is F1 and the supply pressure set value SV2 is P1, the valve operation value MV1 = 50% is calculated as shown in FIG.

When the corrected operation value MV2 = 0%, the valve operation correction value MV3 is 50%.
Based on the valve operation correction value MV3, the opening degree of the IGV3 is set to 20% by the IGV opening degree command value MV4 output from the adjusted flow function generator 24.
Furthermore, the opening degree of the recycling valve 4 is set to 0% by the recycling valve opening degree command value MV5 output from the recycling valve opening degree function generator 26 based on the valve operation correction value MV3.

Since the opening settings of the IGV 3 and the recycle valve 4 are executed by feedback control, the discharge pressure of the compressor 1 is quickly brought close to the set value P1.
Finally, the discharge pressure is accurately established to the set value P1 by feedback control based on the valve operation correction value MV3. As a result, the operating point of the compressor 1 becomes the point A1 shown in FIG.

Next, for example, when an output command requesting the discharge flow rate F2 shown in FIG. 4 is input from the air supply control panel 41 (or the central monitoring control panel 40) to the extraction air compressor control panel 45a, the IGV 3 is opened. The degree is set to 20% which is the minimum opening degree.
Therefore, the flow rate of the compressor 1 is F3.
On the other hand, the opening degree of the recycle valve 4 is set so that the bleed air of the discharge flow rate F3-F2 is recycled to the bleed air line 104a side.
In other words, the recycle valve 4 is opened, and excess bleed air passing through the IGV 3 is returned to the bleed air line 104 a side through the recycle valve 4.
As a result, the flow rate of the bleed air flowing through the header tank supply line 12 becomes the requested discharge flow rate F2.

Next, a case where the coal gasification combined power generation system trips and a bleed air shut-off signal is input from the air supply control panel 41 (or the central monitoring control panel 40) will be described.
In this case, in the pressure setter 21, the supply pressure set value SV2 is set to P2 on the surge control line as shown in FIG.
At the time of shutting off the bleed air, for example, an output command requesting the discharge flow rate F4 shown in FIG. 4 (the minimum flow rate in the gasification furnace 51 minus the flow rate from the oxygen-enriched air supply line 105) is an air supply control. Input from the panel 41 (or the central monitoring control panel 40) to the bleed air compressor control panel 45a.

In this case, when the opening degree of the IGV 3 is set to 20% which is the minimum opening degree, the compressor 1 is operated in a surge region exceeding the surge line d.
In this case, as shown in FIG. 6, since the extracted air is recycled by the recycle valve 4, the operation on the surge control line e is executed.

  Even when the supply flow rate command value SV1 from the air supply control panel 41 (or the central monitoring control panel 40) changes, the surge control line between the set values P1 and P2 is calculated and processed in the same manner as described above. The valve operation value MV1 is calculated so as not to exceed e.

  Since not only the IGV 3 but also the recycle valve 4 is used for controlling the discharge pressure, the fluctuation of the discharge pressure of the compressor 1 in all operating states (when the combined gasification combined cycle system trips, during normal operation, etc.) In other words, the controllability of the discharge pressure can be improved.

  Moreover, when the valve operation correction value MV3 is 50% or more, the command signal for the discharge pressure of the recycle valve 4 is set to zero and the discharge pressure is controlled only by the IGV3. When the valve operation correction value MV3 is less than 50%, Since the discharge pressure is controlled only by the recycle valve 4 while maintaining the IGV 3 at the minimum opening (20%), that is, since the IGV 3 and the recycle valve 4 are operated in the split range, the discharge by the IGV 3 and the recycle valve 4 is performed. Pressure control interference is avoided.

In addition to this, since the nonlinear valve opening function generator 25 can control the IGV 3 having linearity, even if the state of the bleed air from the gas turbine air compressor 57a changes, the amount of bleed air properly Can be controlled.
FIG. 9 shows an operating state according to the first embodiment of the present invention.
What is shown in FIG. 9 is a graph of the relationship between the IGV opening command value MV4 and the normalized flow rate.
As is apparent from FIG. 9, the non-linearity is improved as compared with the conventional one.

(Configuration and Control of Extraction Air Compressor of Second Embodiment)
Next, based on FIGS. 10-15, it demonstrates per control apparatus of the extraction air compressor which concerns on the 2nd Embodiment of this invention.
FIG. 10 is a diagram showing an operating state according to the second embodiment of the present invention.
FIG. 11 is a configuration diagram of a bleed air compressor 64 according to the second embodiment of the present invention.
FIG. 12 is a graph illustrating the relationship between the supply pressure set value SV2 / inlet pressure measurement value PV2 ratio and the opening command lower limit value R2 in the opening command lower limit calculator 32 in FIG.
FIG. 13 is a graph illustrating the relationship between the supply pressure set value SV2 / inlet pressure measured value PV2 ratio and the split valve operation opening correction value R3 in the split calculator 33 of FIG.
FIG. 14 is a graph illustrating a function of the valve operation correction value MV3 and the IGV opening command value MV4 in the adjusted flow rate function generator 24 of FIG.
FIG. 15 is a graph illustrating a function of the valve operation correction value MV3 and the recycle valve opening command value MV5 in the recycle valve opening function generator 26 of FIG.

3 to FIG. 9 is different from the control device for the extraction air compressor according to the first embodiment of the present invention shown in FIGS. 3 to 9 in the extraction air compressor control panel 45b in the valve opening calculation unit shown in FIG. 20a is a valve opening calculation unit 20b that performs feedforward control and feedback control, and a valve lower limit calculation unit 30 is provided.
Other configurations are the same as those of the control device for the extraction air compressor according to the first embodiment.

That is, as shown in FIG. 11, the bleed air compressor 64 in the second embodiment of the present invention is similar to the first embodiment of the present invention in that the compressor 1, the prime mover 2, the IGV 3, and the recycle A valve 4, a check valve 5, a shutoff valve 6, a header tank 7, a header tank pressure gauge 8 and the like are provided.
In addition, an inlet bleed air pressure gauge 14 is attached to the compressor suction line 9.
The header tank supply line 12 is attached with a header tank supply line flow meter 13 that measures the supply amount of the extraction air supplied to the header tank 7 and outputs a tank supply flow rate measurement value PV4.
A tank outlet side line flow meter 15 that measures the flow rate of the extracted air supplied to the gasification furnace 51 and outputs a tank outlet side flow rate measurement value PV3 is attached to the extraction air line 104b.

  On the other hand, the bleed air compressor control panel 45b includes a valve opening calculator 20b, a valve lower limit calculator 30, a regulating flow rate function generator 24, a nonlinear valve opening function generator 25, a recycle valve opening function generator 26, A valve lower limit calculation unit 30 is provided.

First, the valve opening calculation unit 20b will be described.
The valve opening calculation unit 20b includes an adder 28 and a flow rate regulator 29 in addition to the pressure setter 21, the command value function generator 22, and the opening command adder 23 in the first embodiment of the present invention. Is provided.
The pressure setting device 21 stores the supply pressure set value SV2 inputted from the air supply control panel 41.

The pressure regulator 27 receives the supply pressure set value SV2 from the pressure setter 21 and the supply pressure measurement value PV1 measured from the header tank pressure gauge 8.
In the pressure regulator 27, a PI (proportional, integral) calculation process is performed based on the deviation between the supply pressure set value SV2 and the supply pressure measurement value PV1, and a pressure operation value MV7 is calculated by the following equation. This pressure operation value MV7 Is output to the adder 28 as an operation signal for feedback control.
Pressure operation value MV7 = K1 · (SV2−PV1) + K2 · ∫ (SV2−PV1) dt

In the adder 28, the pressure operation value MV7 and the tank outlet side flow rate measurement value PV3 (for feedforward control) input from the tank outlet side line flow meter 15 are added as shown in the following equation, and the pressure operation correction value MV8 is added. Is output to the flow controller 29.
Pressure operation correction value MV8 = MV7 + K3 · PV3
A tank supply flow rate measurement value PV4 (for feedforward control) is also input to the flow rate regulator 29 from the header tank supply line flow meter 13.

In the flow rate regulator 29, PI (proportional, integral) calculation processing is performed based on the deviation between the pressure operation correction value MV8 and the tank supply flow rate measurement value PV4 to calculate an operation increase / decrease value (for feedforward signal).
That is, finally, in the pressure regulator 27 adder 28 and the flow rate regulator 29, the corrected operation value MV2 is calculated by the following equation.
Correction operation value MV2 = K3 · (MV8−PV4) + K4 · ∫ (MV8−PV4) dt
K1 to K4 are constants.
Thus, pressure control with high responsiveness is possible by a combination of feedforward control and feedback control.
The corrected operation value MV2 calculated by the flow rate regulator 29 is output to the opening degree command adder 23.
The command value function generator 22 and the opening command adder 23 perform the same calculation and processing as those in the first embodiment of the present invention.

  As described above, the supply flow rate command value SV1 from the air supply control panel 41 and the supply by the command value function generator 22, the opening degree command adder 23, the pressure setter 21, the pressure regulator 27, the adder 28, and the flow rate regulator 29. A valve opening calculation unit 20b that calculates the valve operation correction value MV3 based on the pressure set value SV2 and the supply pressure measurement value PV1 from the header tank pressure gauge 8 is configured.

Next, when the supply pressure set value SV2 is changed based on FIGS. 12 and 13, the opening command lower limit value and the split point change in the adjustment flow rate function generator 24 and the recycle valve opening function generator 26, which will be described later, are changed. (Correction) will be described.
That is, according to the change command of the supply pressure set value SV2 from the air supply control panel 41, the comparator 31, the opening command lower limit calculator 32, and the split point calculator 33 cause the flow rate adjustment opening lower limit and the split point. Is to change.

First, an inlet pressure measurement value PV2 is transmitted from the inlet bleed air pressure gauge 14 to the comparator 31, and a supply pressure setting value SV2 is transmitted from the pressure setter 21.
Then, in the comparator 31, the supply pressure set value SV2 and the inlet pressure measured value PV2 are compared (divided).
The calculation result, supply pressure set value / inlet pressure measurement value ratio R1 (R1 = SV2 / PV2) is output to the opening command lower limit calculator 32 and the split point calculator 33.

The opening command lower limit calculator 32 calculates an opening command lower limit R2 that increases according to the supply pressure set value / inlet pressure measurement value ratio R1, based on the function illustrated in FIG.
For example, when the supply pressure set value / inlet pressure measurement value ratio R1 is 2.4, 3.6, 3.8, the opening command lower limit value R2 is 40% (= y1) and 90%, respectively. (= Y2), a function that becomes 100% (= y3).
This function is a function of a polygonal curve that passes through points y1, y2, and y3 or a broken line that bends at the inflection point y2.
The calculated opening command lower limit value R2 (y1 to y2 to y3) is transmitted to the adjusted flow function generator 24.

The split point calculator 33 calculates a split point R3 that increases in accordance with the supply pressure set value / inlet pressure measured value ratio R1, based on the function illustrated in FIG.
For example, when the supply pressure set value / inlet pressure measurement value ratio R1 is 2.4, 3.6, 3.8, the split point R3 is 50% (= x1) and 75% (= x2), respectively. ), 95% (= x3).
This function is a function of a polygonal curve that passes through points x1, x2, and x3, or a bent line that bends at an inflection point x2.
The calculated split point R3 (x1 to x2 to x3) is transmitted to the adjusted flow rate function generator 24 and the recycle valve opening function generator 26.

As described above, the valve operation correction value MV3 is transmitted from the opening command adder 23 of the valve opening calculation unit 20b to the adjusted flow function generator 24, and the opening command lower limit calculator 32 receives the opening command lower limit value. R2 is transmitted, and the split point R3 is transmitted from the split point calculator 33.
Then, the adjusted flow rate function generator 24 calculates the IGV opening command value MV4 from the valve operation correction value MV3, the opening command lower limit value R2, and the split point R3 based on the function illustrated in FIG. The degree command value MV4 is output to the nonlinear valve opening function generator 25.

In the function illustrated in FIG. 14, when the split point is S1 (x1 = 50%, y1 = 40%), the IGV is not opened until the valve operation correction value MV3 is changed from 0% to 50% (= x1). The degree command value MV4 is maintained at 50% (= y1), and the IGV opening command value MV4 is increased from 50% (= y1) to 100% as the valve operation correction value MV3 increases from 50% (= x1). It increases linearly up to (split point S3).
When the split point is S2 (x2 = 75%, y2 = 90%), the IGV opening command value MV4 is 90 until the valve operation correction value MV3 is changed from 0% to 75% (= x2). % (= Y2) is maintained, and as the valve operation correction value MV3 increases from 75% (= x2), the IGV opening command value MV4 increases from 90% (= y2) to 100% (split point S3). Increases linearly.
Note that the split points (S1 to S2 to S3) are on a broken line that is bent at the point S2 (x2 = 70%, y2 = 50%) or the points S1 (x1 = 50%, y1 = 40%), S2 (x2). = 75%, y2 = 90%) and move on a polynomial approximation curve passing through S3 (x3 = 95%, y3 = 100%).

In the nonlinear valve opening function generator 25, as in the case of the second embodiment of the present invention, the IGV opening command correction value MV6 is set by a preset or stored correction function as shown in FIG. Is calculated.
The IGV3 is controlled by the IGV opening command correction value MV6 calculated by the nonlinear valve opening function generator 25.

  When the opening command lower limit value R2 is output as the IGV opening command value MV4, it is calculated by the nonlinear valve opening function generator 25 to become the flow rate adjustment opening lower limit value, and the supply pressure set value (SV2) The relation with the measured / inlet pressure value (PV2) ratio R1 is as illustrated in FIG.

On the other hand, to the recycle valve opening function generator 26, the valve operation correction value MV3 is input from the opening command adder 23 of the valve opening calculator 20b, and the split point R3 is input from the split point calculator 33.
In the recycle valve opening function generator 26, the valve operation correction value MV3 is changed from 0% to the split point R3 (x1 = 50% to x2 = 75% to x3 = 95%) based on the function illustrated in FIG. Recycle valve 4 opening degree is linearly decreased from 100% to 0% until the valve becomes, and when the valve operation correction value MV3 is equal to or higher than the split point R3, the recycle valve opening degree is held at 0%. A value MV5 is calculated.
The recycle valve 4 is controlled based on the calculated recycle valve opening command value MV5.

  In this way, as the supply pressure set value SV2 increases (when the inlet pressure measured value PV2 is constant) or as the inlet pressure measured value PV2 decreases (when the supply pressure set value SV2 is constant), further As the supply pressure set value / inlet pressure measured value ratio R1 that is the ratio of the supply pressure set value SV2 and the inlet pressure measured value PV2 increases (both the supply pressure set value SV2 and the inlet pressure measured value PV2 change), the split point is changed. By making it larger (changed) than 50%, the split point is appropriately set so as to improve the controllability of the recycle valve 4 in consideration of the dynamic characteristics of the recycle valve 4. The flow rate adjustment means) and the opening of the recycle valve 4 are highly accurate without surging, and the pressure according to the situation of the energy / petrochemical plant plant, etc. Control becomes possible.

  In addition to this, similarly to the bleed air compressor of the first embodiment, the nonlinear valve opening function generator 25 can control the IGV 3 having linearity, so the gas turbine air compressor 57a. Even if the bleed air from the air changes, the amount of bleed air can be controlled appropriately.

In addition, the control apparatus of the above-mentioned extraction air compressor 64 is not limited to compression and pumping of extraction air of a coal gasification power generation system, but can be applied to various other compressible gases.
Moreover, you may incorporate the valve lower limit operation part 30 in 2nd Embodiment in the extraction air compressor control board 45a in 1st Embodiment of this invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the whole coal gasification combined cycle system which employ | adopted the control apparatus of the compressor which concerns on each embodiment of this invention. It is the schematic of the control apparatus of the coal gasification combined cycle system of FIG. It is a block diagram of the extraction air compressor 64 which concerns on the 1st Embodiment of this invention. FIG. 4 is a characteristic diagram illustrating the relationship between a supply flow rate command value SV1 and a supply pressure set value SV2 in the command value function generator 22 of FIG. 3 using a valve operation value MV1 as a parameter. 4 is a graph illustrating a relationship between a supply flow rate command value SV1 and a valve operation value MV1 in the command value function generator 22 of FIG. 4 is a graph illustrating a function of a valve operation correction value MV3 and an IGV opening command value MV4 in the adjusted flow rate function generator 24 of FIG. 6 is a graph illustrating the relationship between an IGV opening command value MV4 and an IGV opening command correction value MV6 in the nonlinear opening function generator 25. 4 is a graph illustrating a function of a valve operation correction value MV3 and a recycle valve opening command value MV5 in the recycle valve opening function generator 26 of FIG. It is a figure which shows the operation state in the 1st Embodiment of this invention. It is a figure which shows the operation state which concerns on the 2nd Embodiment of this invention. It is a block diagram of the extraction air compressor 64 which concerns on the 2nd Embodiment of this invention. 12 is a graph illustrating the relationship between a supply pressure set value SV2 / inlet pressure measurement value PV2 ratio and an opening command lower limit value R2 in the opening command lower limit calculator 32 of FIG. 12 is a graph illustrating the relationship between a supply pressure set value SV2 / inlet pressure measurement value PV2 ratio and a split valve operation opening correction value R3 in the split calculator 33 of FIG. 12 is a graph illustrating a function of a valve operation correction value MV3 and an IGV opening command value MV4 in the adjusted flow rate function generator 24 of FIG. 12 is a graph illustrating a function of a valve operation correction value MV3 and a recycle valve opening command value MV5 in the recycle valve opening function generator 26 of FIG. It is the schematic of the control apparatus of the conventional compressor.

Explanation of symbols

1 Compressor 2 Motor 3 IGV
4 Recycle valve 5 Check valve 6 Shut-off valve 7 Header tank 8 Header tank pressure gauge 9 Compressor suction line 10 Compressor discharge line 11 Recycle line 12 Header tank supply line 13 Header tank supply line flow meter 14 Inlet extraction air pressure gauge 15 Tank outlet side line flow meter 20a, 20b Valve opening calculator 21 Pressure setter 22 Command value function generator 23 Opening command adder 24 Adjusted flow function generator 25 Nonlinear valve opening function generator 26 Recycle valve opening function Generator 27 Pressure regulator 28 Adder 29 Flow rate regulator 30 Valve lower limit value calculator 31 Comparator 32 Opening command lower limit value calculator 33 Split point calculator 40 Central monitoring control panel 41 Air supply control panel 42 Turbine control panel 43a -43d Compressor control panel 44a-44d Valve control panel 45a, 45b Extraction air pressure Machine control panel 46 Raw coal pulverizer control panel 51 Gasification furnace 51a Annulus section 52 Generated gas cooler 53 Cyclone 54 Porous filter 55 Dedusting device 56 Desulfurization apparatus 57 Gas turbine 57a Gas turbine air compressor 57b Combustion section 57c Generator 58 Pulverized coal supply device 59, 60 Regenerative heat exchanger 61 Waste heat recovery boiler 62 Steam turbine 62a Generator 62b Cooler 62c Condensate pump 63 Air separation device 64 Extraction air compressor 65 Raw material air compressor 66 Nitrogen compressor 67 Oxygen Compressor 68 High-pressure nitrogen gas compressor 70 to 72 Nitrogen control valve 73 Oxygen control valve 74 Extraction air control valve 75 to 80 Flow meter 81 Control valve 101 Coal coal supply line 102 Pulverized coal transport line 103 Combustible gas supply line 104a, 104b Extraction air line 105 Oxygen-enriched sky Supply line 106 Nitrogen supply line 107 Gasification agent supply line 108 Pressure air line 109 Slag discharge line 110 Pressurization line 111 Steam discharge line 112 Condensate evaporation line 113 Char supply line 114 Nitrogen gas addition line R1 Supply pressure set value / Inlet pressure Measured value ratio R2 Opening command lower limit value R3 Split point SV1 Supply flow rate command value SV2 Supply pressure setting value MV1 Valve operation value MV2 Correction operation value MV3 Valve operation correction value MV4 IGV opening command value MV5 Recycle valve opening command value MV6 IGV Opening command correction value MV7 Pressure operation value MV8 Pressure operation correction value PV1 Supply pressure measurement value PV2 Inlet pressure measurement value PV3 Tank outlet side flow rate measurement value PV4 Tank supply flow rate measurement value

Claims (3)

A gasification furnace for producing a combustible gas by contacting a fossil fuel with a gasifying agent;
A gas turbine that generates electricity by rotating the turbine by burning combustible gas; and
A bleed air line for supplying air partially extracted from a gas turbine air compressor driven by the gas turbine as a gasifying agent to the gasification furnace;
An air compressor for raw materials that introduces the atmosphere;
An air separation device connected to the raw material air compressor;
A nitrogen supply line for introducing a part of nitrogen separated in the air separation device into the gasification furnace and introducing the remaining nitrogen into a system system between the gasification furnace and the gas turbine;
In a coal gasification power generation system having an oxygen-enriched air supply line for mixing separated oxygen into the extracted air line,
A compressor having a compressor, an IGV disposed on a suction side of the compressor, a recycle line connecting a discharge side and a suction side of the compressor, and a recycle valve provided in the recycle line A control device is provided in the extraction air line; and
The control device of the compressor is
A valve operation correction value based on a supply pressure measurement value measured by a header tank pressure gauge that measures a supply flow rate command value to the compressor, a supply pressure set value, and a header tank pressure connected to the downstream side of the compressor A valve opening calculation unit for calculating
The valve operation correction value is received from the valve opening calculation unit, and when the valve operation correction value is greater than or equal to a predetermined split point, the valve operation correction value increases as the valve operation correction value increases, and is less than or equal to the split point. An adjusted flow function generator for calculating an IGV opening command value, which is sometimes a predetermined lower limit value of the flow adjustment opening;
In order to control the opening degree of the IGV so that the IGV opening degree command value is input from the control flow function generator and the flow rate actually flowing through the compressor is in a proportional relationship. A non-linear valve opening function generator for calculating the IGV opening command correction value of
Receiving the valve operation correction value from the valve opening calculation unit, calculating a recycle valve opening command value that decreases as the valve operation correction value increases when the valve operation correction value is less than a predetermined split point A recycle valve opening function generator that outputs the recycle valve control signal;
A coal gasification power generation system comprising: A compressor having a compressor, an IGV disposed on a suction side of the compressor, a recycle line connecting a discharge side and a suction side of the compressor, and a recycle valve provided in the recycle line In the control device,
A valve operation correction value based on a supply pressure measurement value measured by a header tank pressure gauge that measures a supply flow rate command value to the compressor, a supply pressure set value, and a header tank pressure connected to the downstream side of the compressor A valve opening calculation unit for calculating
Comparator for calculating a supply pressure set value / inlet pressure measurement value ratio that is a ratio between the supply pressure set value and an inlet pressure measurement value measured by an inlet bleed air pressure gauge that measures the pressure downstream of the compressor When,
An opening command lower limit value calculator that receives a supply pressure set value / inlet pressure measurement value ratio from the comparator and calculates an opening command lower limit value that increases in accordance with the supply pressure set value / inlet pressure measurement value ratio; ,
A split point calculator for receiving a supply pressure set value / inlet pressure measured value ratio from the comparator and calculating a split point that increases in accordance with the supply pressure set value / inlet pressure measured value ratio;
The valve operation correction value is received from the valve opening calculation unit, the opening command lower limit value is received from the opening command lower limit calculator, the split point is received from the split point calculator, and An adjustment flow rate that calculates an IGV opening command value that increases as the valve operation correction value increases when the valve operation correction value is equal to or greater than the split point and that is the opening command lower limit value when the valve operation correction value is equal to or less than the split point. A function generator;
In order to control the opening degree of the IGV so that the IGV opening degree command value is input from the control flow function generator and the flow rate actually flowing through the compressor is in a proportional relationship. A non-linear valve opening function generator for calculating the IGV opening command correction value of
The valve operation correction value is received from the valve opening calculation unit, the split point is received from the split point calculator, and the valve operation correction value increases when the valve operation correction value is less than the split point. A recycle valve opening function generator that calculates a recycle valve opening command value that decreases along with the recycle valve opening command value and outputs the recycle valve control signal;
A control device for a compressor, comprising: A gasification furnace for producing a combustible gas by contacting a fossil fuel with a gasifying agent;
A gas turbine that generates electricity by rotating the turbine by burning combustible gas; and
A bleed air line for supplying air partially extracted from a gas turbine air compressor driven by the gas turbine as a gasifying agent to the gasification furnace;
An air compressor for raw materials that introduces the atmosphere;
An air separation device connected to the raw material air compressor;
A nitrogen supply line for introducing a part of nitrogen separated in the air separation device into the gasification furnace and introducing the remaining nitrogen into a system system between the gasification furnace and the gas turbine;
In a coal gasification power generation system having an oxygen-enriched air supply line for mixing separated oxygen into the extracted air line,
Coal gasification power generation system characterized by comprising a control apparatus for compressor mounting serial to claim 2 to the bleed air line.

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