JPS5953468B2 - Condensate purification method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condensate purification method and apparatus applied to a condensate system of a thermal or nuclear power plant.

A combination of a filtration tower and a desalination tower is usually used to purify condensate.

A plurality of these towers are arranged in parallel.

The differential pressure of each group, especially each filtration tower, increases depending on the operating time.

An increase in differential pressure causes a decrease in the efficiency of the pump that supplies condensate to the purification tower and a decrease in purification capacity.

This is mainly due to the fact that the crud and ionic compounds contained in the condensate are adsorbed by the filter material, or that the material and the granular treatment agent themselves are pulverized.

The differential pressure, that is, the degree of contamination, differs in each tower section, and in an uncontrolled state, the flow rate in the most contaminated column is small, and the flow rate in the column immediately after regeneration processing is large.

Since each purification tower has an optimum flow rate to demonstrate its purification ability, a tower with a high differential pressure becomes unusable, and a tower immediately after regeneration processing has an excessive flow rate.

In order to prevent this situation, the maximum flow rate of the column immediately after the regeneration treatment should be within the above-mentioned optimum range, but in this case, each group will not be fully utilized.

Therefore, by flowing condensate at the same flow rate to each unit, the towers with high differential pressure can be fully utilized, and the life of the towers with low differential pressure (the time before entering regeneration processing) can be extended. Conceivable.

In addition, after measuring the differential pressure inside each column and separating the column where the differential pressure reached the specified value from other columns (after stopping the flow of condensate),
After cleaning or taking it out and performing a regeneration process outside, it will be refilled, or it will go through a regeneration process, such as taking it out and refilling it with a new one.

Conventionally, the side stream type (that is, two condensate reservoirs are provided, one is a condensate reservoir for turbine exhaust steam, the other is a temporary storage tank for purification agent condensate to be sent to the boiler; This is a type of condensate purification device that returns the remainder to the condensate reservoir.

Same below.

) In a popular type condensate purification system that does not have a A method of matching the flow rate is adopted.

Specifically, first, the flow rate of two adjacent towers is detected, the rain detection signal is applied to a biselector, and the larger one is selected.Similarly, the flow rates of two towers are applied to the biselector at a time for the other towers, and the selected several The output signal is further applied to the bi-selector two by two to select the larger one, and this selection of higher values is repeated in sequence to select the output signal that corresponds to the maximum flow rate (i.e., the maximum opening of the flow rate control valve) in each column group. .

This maximum output signal is input to the master controller and compared with the set signal.

The output signal of the master regulator is cascaded to a flow regulator associated with each unit.

Each flow rate regulator then compares the output signal of the master regulator with a signal indicating the current flow rate of each group to adjust the flow rate of each group.

In this way, it is ultimately (ideally) possible to achieve equal flow rate control between the columns.

However, with the conventional method of detecting the current flow rate, subjecting it to the comparison and selection process described above, and then outputting a control command signal, the current flow rate may have already fluctuated by the time this command signal is generated. , there is a problem with control followability.

This means that when the condensate flow rate (required amount) increases rapidly, such as when the operating load of the turbine suddenly increases, cavitation occurs in the pump that supplies condensate to the condensate purification equipment, and the condensate flows to the boiler, etc. Water supply pumps that supply water may cause accidents such as pump trips.

Moreover, since a large number of biselectors are used, the control device becomes complicated.

The present invention eliminates the above-mentioned conventional drawbacks and provides a condensate purification method and an apparatus thereof that are excellent in followability of equal flow rate control between columns.

In order to achieve the above object, the present invention performs the equal flow rate control based on the total flow rate of condensate flowing through all purification towers and the flow rate of condensate in each purification tower.

If control is performed based on the total flow rate of condensate and the flow rate in each column in this way, there is no need to repeatedly compare the current flow rates with each other as in the past. Since the flow rate is adjusted immediately after comparing it with the total flow rate, the flow rate is controlled to be equal between each column with good followability.

In addition, the control device is simplified.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram of a condensate purification apparatus showing a first embodiment of the present invention.

A condensate reservoir or hot well 2 is formed at the bottom of the condenser 1 into which turbine exhaust steam is introduced.

A condensate feed pipe 3 opens at the bottom of the hot well 2 .

This pipe repeats branching and flow path gathering several times along the way.

First, immediately after the hot well 2, a condensate water supply pump 4 is placed on each of the branch pipes that have branched into multiple pipes (two in the figure). Place two units in parallel.

Next, the downstream side of the 4 groups of condensate water supply pumps once gathers the flow paths and then branches again into multiple lines, and the condensate purification line 5 is placed on each branch pipe, and in this way, the condensate purification line 5 is connected to the condensate water. A plurality of them are arranged in parallel on the feed pipe 3.

Each condensate purification line 5 is configured with a flow rate detector 6, a flow rate control valve 7, and a filtration tower 8 arranged in this order from the upstream side.

In addition, the filtration tower 8 is attached with an internal filtration tower differential pressure detector 9.

Next, on the downstream side of each group of 5 condensate purification series, the flow paths are once assembled and then branched again into multiple lines, and the demineralization tower 10 is arranged on the branch pipe, and in this way, the demineralization tower 10 is used to feed the condensate. A plurality of tubes are arranged in parallel on the tube 3.

Next, the flow paths on the downstream side of each desalination tower 10 are once assembled and then branched into three lines, and a grand steam condenser 11. Orifice 12 and condenser air extractor 13 are arranged.

Gland steam condenser 11. A flow rate detector 14 is disposed on the condensate feed pipe 3 in which the downstream sides of the orifice 12 and the condenser air extractor 13 are assembled into flow paths.

The other end of the condensate feed pipe 3 (the downstream end 1 is the intermediate storage tank 1
5 (Also called side stream tank or second hot well.

). In addition, a condensate feed pipe 16 leading to a boiler (not shown) and a condensate return pipe 17 returning to the condenser 1 are opened at the bottom of the intermediate storage tank 15 .

The steam spaces between the intermediate storage tank 15 and the condenser 1 are communicated through a steam space communication pipe 18.

A condensate feed pump 19 is provided on the condensate feed pipe 16, and a plurality of flow control valves 20 are provided in parallel on the condensate return pipe 17.

A water level detector 21 is attached to the intermediate storage tank 15.

Further, the electrical connections are as follows.

Flow sensor 14 connects to relatively 22 input terminals.

The other input terminals of the comparator 22 are connected to setters 23 and 24.

The setting device 23 is used to set the rated flow rate when two condensate feed pumps 4 are in operation, and the setting device 24 is used to set the rated flow rate when one of the condensate feed pumps 4 is in operation.

On the other hand, the condensate feed pump 4 is connected to a set value selector 25.

The set value selector 25 is connected to the setter 23 and the setter 24.

The set value selector 25 selects either the setter 23 or the setter 24 as the setter for input to the comparator 22 depending on the number of operating condensate feed pumps 4.

Each flow control valve 7 is also connected to an output terminal of a comparator 26.

A comparator 26 is attached to each condensate purification line 5.

The input terminal of each comparator 26 is connected to the flow rate detector 6 in the same series and the output terminal of the average value calculator 40.

The input terminal of the average value calculator 40 is connected to the output terminal of the comparator 22.

On the other hand, the water level detector 21 is connected to the flow rate control valve 20 via a valve opening adjuster 27.

The number of valve opening adjusters 27 is equal to the number of flow rate control valves 20.

Turbine exhaust steam is condensed in a condenser 1, and the condensed water is temporarily stored in a hot well 2.

Condensed water (that is, condensate) in the hot well 2 is sent to various devices on the downstream side by a condensate feed pipe 3 and a condensate feed pump 4.

The condensate is first divided into a plurality of condensate purification lines 5.

Each train reaches a rear column 8 whose flow rate is controlled by a flow rate control valve 7.

Changes in the differential pressure within the filtration tower 8 are detected by a differential pressure detector 9.

According to the control procedure described later, condensate flows at the same flow rate between each series, and the differential pressure in each filtration column 8 is detected by differential pressure detection 9, and when it reaches a specified value, the column is isolated from other columns. The above-mentioned playback process begins.

The condensate that has passed through the filtration tower 8 and has been subjected to the filtration treatment is once collected and divided again to enter the plurality of demineralization towers 10.

Water quality treatment is performed within each desalination tower 10.

The condensate that has passed through the desalination tower 10 once collects, and then is divided into a gland steam condenser 11 and a condenser air extractor 13, where indirect heat exchange is performed, preheated, and flows out to the downstream side. .

The gland steam condenser 11 is used to condense the steam enclosed in the turbine and valve gland parts (not shown), and the condenser air extractor 13 is used to extract non-condensed gas in the condenser 1. This is to condense the discharged steam of the steam ejector drive steam.

The orifice 12 is used to maintain a constant flow of condensate to the gland steam condenser 11 and condenser air extractor 13.

The purified condensate that has passed through these indirect heat exchange sections gathers again and passes through the flow rate detector 14 before entering the intermediate storage tank 15 .

The condensate introduced into the intermediate storage tank 15 is a main system (that is, a system including a turbine-driving steam generator (not shown), etc.).

) is discharged from the condensate feed pipe 16 by the condensate feed pump 19.

The remaining condensate is then returned into the condenser 1 via the condensate return pipe 17 and the flow rate control valve 20.

The intermediate storage tank 15 is provided at a position higher than the water level of the hot well 2, and the condensate passes through the condensate return pipe 17 to the hot well 2.
fall to.

A water level detector 21 provided on the side of the intermediate storage tank 15 is electrically connected to the input end of a valve opening regulator 27 to adjust the opening of each flow control valve 20 and control the condenser return flow. Adjust the amount of condensate.

The inside of the intermediate storage tank 15 and the inside of the condenser 1 are kept at the same pressure by a steam space communication pipe 18.

The total condensate flow rate detected by the flow rate detector 14 installed on the condensate feed pipe 3 is input to the comparator 22 .

On the other hand, the set value selector 25 is informed whether the number of operating condensate feed pumps 4 is one or two, and the set value is immediately switched.

When the number of operating condensate feed pumps 4 is two, setter 2
3 and comparator 22 are connected, and when there is one unit, setting device 2
4 and comparator 22 are connected.

In this way, the set flow rate corresponding to the number of operating condensate feed pumps 4 is compared with the total condensate flow rate.

In addition, each set flow rate is set to the rated flow rate of the condensate feed pump 4 in order to make maximum use of the capacity of the condensate purification device and to operate the condensate feed pump 4 at the highest efficiency point. to be enacted.

For example, the 100% flow rate when 12 pumps are operated is aml/mi.
n and the total condensate flow rate actually detected by the flow rate detector 14 is bml/min, then the comparator 22 calculates (
a-b) A signal is issued commanding a flow increase of ml/min, which signal is distributed evenly over the number of condensate purification series 5 by means of an average value calculator 40.

If the number of condensate purification series 5 is assumed to be two for simplicity of explanation,
An increase command of (a-b) 2m 1 /min is issued for each cylinder.

On the other hand, the flow rate detector 6 detects the current flow rate C (flow rate d in other series) m I /min, which is compared in the comparator 26 to calculate ((a-b)/min for each series.
2-C” or ((a-b)/2-d)
A flow rate change command of ml/min is given to the flow rate control valve 7.

Then, each flow rate control valve 7 changes its opening degree based on the given flow rate change command, and for example, the current flow rate is cm l /min.
The series is the flow rate increase (decrease) ((a-b)/2-c
) m 1 /min opening degree change is dml /mi
The series of n is the flow rate decrease (increase) ((a-b)/2-
d) The opening degree is changed by ml/min to control the flow rate between each column to be equal.

Also, the total flow rate after changing the opening of both columns is [((a-b)/2-
C) +((a-b)/2'-d), l or bm
The flow rate is increased to 1/min.

According to the first embodiment of the present invention described above, the following effects can be obtained mainly.

(1) Equal flow rate control between each column has a marked difference in followability compared to the conventional method in which the current flow rates of two adjacent columns are sequentially compared using a biselector.

For example, if there are 10 condensate purification series 5, in the conventional method, comparisons are performed 10 times in a tournament style until a flow rate fluctuation command is issued to each series, but in this embodiment, 2 comparisons are made for each series.
comparison (i.e., comparison between the total flow rate and the set flow rate, and the comparison between the command flow rate based on that comparison and the current flow rate for each series.

) is sufficient. As an applied example, it is possible to implement a method in which comparison with a set value is not performed, but in such a case, only one comparison is required.

As described above, according to this embodiment, there is an effect that uniform flow rate control with excellent followability can be achieved.

Moreover, the control circuit is simplified as shown.

(2) Even if the flow rate of each unit is controlled at the same rate, the differential pressure in current filtration towers tends to increase as the operating time increases.

In this embodiment, each filtration column 8 is equipped with a differential pressure detector 9 to detect the differential pressure within each column, so that when the differential pressure reaches a specified value, regeneration is performed for each column as appropriate. can enter.

(3) Each filtration tower 8 is filled with resin in a regular manner, so if the flow rate is too small, the resin will shift in position, and the flow resistance due to differential pressure will increase, making it even more difficult to flow. .

On the other hand, if the flow rate becomes too large, a phenomenon of positional displacement of the resin will occur, and the amount of increase in differential pressure will further increase.

Conversely, there is a possibility that the water may pass through without being sufficiently filtered.

However, in this example, the flow rate fluctuation is determined by comparing the total condensate flow rate with the set value, and the average value obtained by dividing this flow rate fluctuation by the number of each filtration tower is compared with the flow rate for each series. Since the flow rate is controlled to be constant, it is possible to maintain the flow rate in the filtration tower 8 within the optimum range.

(4) In this embodiment, the set value is the rated flow rate of the condensate feed pump 4 that causes condensate to flow into each series, so the capacity of the condensate purification device can be utilized to the maximum, Moreover, the condensate feed pump 4 can be operated at the highest efficiency point.

(5) In this embodiment, two condensate feed pumps 4 are provided, so
It is possible to deal with the failure or startup of the condensate feed pump 4.

Moreover, by preparing setting values corresponding to the number of operating condensate feed pumps 4, such as the setting values of the setting devices 23 and 24, and making this selectable, the design conditions for the condensate feed pump 4 are relaxed. be done.

This will be explained using FIG.

FIG. 2 is a diagram illustrating the characteristics of the condensate feed pump 4.

The discharge amount when two condensate feed pumps 4 are operated is represented by a characteristic curve i that shows the relationship between the head and the flow rate, and a characteristic curve ii that shows the relationship between the flow rate and the system pressure loss curve (also called a system pressure loss curve).

) is determined by the fulcrum.

The pressure drop in the filter tower 8 changes depending on the operating time.

When the differential pressure between each group is small, the system pressure loss curve is as shown in ii, and therefore the operating point of the condensate feed pump 4 is the intersection O.

However, when the differential pressure increases, the system pressure loss curve becomes iii, and the operating point of the condensate feed pump 4 becomes the intersection point P.

Therefore, if the condensate purification system flow rate is not controlled, the condensate purification system flow rate will change over time even if the power plant load is the same.

Therefore, the above-mentioned equal flow rate control is performed to maintain a substantially constant flow rate both between towers and over time, thereby stably maintaining the purification ability.

On the other hand, the characteristic curve when one condensate feed pump 4 is operated is iv
It is indicated by.

According to the conventional system, the operating point of the condensate feed pump 4 is on the curve i.
The flow rate at this point is approximately 160% of the rated flow rate of the condensate feed pump 4.

The condensate feed pump 4 is designed to operate continuously at such an excessive flow rate.
This can be said to be a very harsh condition as the pushing pressure decreases and cavitation is more likely to occur, and the drive motor becomes overloaded.

However, in this embodiment, since the set value can be selected according to the number of operating units as described above, the increase in system loss due to throttling of the flow control valve 7 is shown by the system pressure loss curve V.

The operating point of the restoring feed pump 4 becomes the intersection R, and by throttling the flow control valve 7 so that the intersection R becomes the rated flow rate of the condensate feed pump 4, the design conditions of the condensate feed pump 4 are eased. will be done.

(6) This example is adopted for a side stream type condensate system.

Therefore, a flow rate corresponding to the required amount can be sent to the main system using the intermediate storage tank 15 as a cushion, and the flow rate in the condensate purification system (that is, from the hot well 2 to the intermediate storage tank 15) can be maintained at a nearly constant flow rate. It becomes possible.

In this way, the capacity of the purifying device can be maintained even more stably.

(7) In this embodiment, a flow rate control valve 20 is provided on the condensate return pipe 17 to control the flow rate of the condenser return.

Therefore, troubles caused by the difference in head between the intermediate storage tank 15 and the liquid level in the hot well 2 can be prevented.

FIG. 3 is a system diagram of a condensate purification apparatus showing a second embodiment of the present invention.

The difference from the first embodiment is mainly that cavitation of the flow control valve 20 is prevented.

Characteristic parts of the second embodiment will be explained below.

Flow rate detector 14 is connected to an input terminal of comparator 22 and also to an input terminal of control switch 28 .

The control switch 28 includes a setting device 23, 24 and a control switch 29.
Connect to.

In addition to this, the input terminal of the control switch 29 is connected to a valve opening detector 3.
0 is connected.

Control switch 29 is connected to setting device 23 and converters 31,32.

A water level detector 21 is also connected to the converters 31 and 32.

A flow restrictor 33 is connected to the output terminal of the converter 31;
A flow restrictor 34 is connected to each of the two output terminals.

The setters 23 and 24 and the converters 31 and 32 are also connected to a set value selector 25.

The setters 23 and 24 and the flow rate limiters 33 and 34 are all connected to the input terminal of the comparator 22 along with the flow rate detector 14.

The rest is the same as the first embodiment.

Note that the control switch 28 switches the setting device 23.2 depending on whether the flow rate detected by the flow rate detector 14 is 90% or more of the rated flow rate.
4 or control based on the control switch 29, and the control switch 29 is a device that selects control based on 4 or control based on the control switch 29, and the control switch 29 is a device that selects control based on 1
This device selects control based on the setter 23, 24 or the water level detector 21 depending on whether the water level is below %.

Further, the converters 31.32 are devices that convert the amount of water level change detected by the water level detector 21 into a flow rate signal similar to the setter 23.24, and the flow rate limiters 33.34 are devices that convert the amount of water level change detected by the water level detector 21
This device prevents the condensate purification system flow rate from changing suddenly when the water level fluctuation signal changes suddenly.

FIG. 4 is a diagram showing the control flow of this embodiment.

First, the total condensate flow rate detected by the flow rate detector 14 is input to the control switch 28.

Therefore, if the flow rate is 90% or more of the rated flow rate, the control switch 29 is activated.

Conversely, if it is 90% or less, the setting devices 23 and 24 are ready to operate.

On the other hand, when the opening degree of the flow rate control valve 20 detected by the valve opening degree detector 30 becomes 10% or less for 30 seconds continuously, the converter 31.3
2 is ready for operation, otherwise the setting device 23
．． 24 becomes operational.

A water level fluctuation signal is input from the water level detector 21 to the converters 31 and 32, where the signal is converted into a flow rate unit and then enters the comparator 22 via flow rate limiters 33 and 34.

The setters 23 and 24 also enter the comparator 22 in the same manner as in the first embodiment.

Note that when two condensate feed pumps 4 are in operation, the setting device 23 or the converter 31 is in a drivable state, and when one condensate feed pump 4 is in operation, the setting device 24 or the converter 32 is in a drivable state.

In this way, the opening degree of the flow rate control valve 20 is continuously maintained at 10% for 30 seconds.
When the water level exceeds that level, control is performed to keep the water level of the intermediate storage tank 15 constant.

For this water level-chemotaxis control, a signal based on the amount of water level fluctuation is compared with a signal based on the total condensate flow rate detected by the flow rate detector 14 in the comparator 22, and is further compared with the flow rate for each condensate purification series. The opening degree of the flow rate control valve 7 is determined by comparison.

On the other hand, when the total condensate flow rate is 90% or less of the rated flow rate, or when the valve opening degree of the flow rate control valve 20 is 10% or more or 10% or less but only temporarily for less than 30 seconds,
The same control as in the first embodiment, that is, control to achieve the rated flow rate of the pump is performed.

Figure 5 shows this operating procedure in relation to the operating load of the main system.

In the figure, curve vi shows the flow rate from the intermediate storage tank 15 to the main system, and curve vii shows the flow rate in the side stream system, that is, the condensate feed pipe 3 of purified condensate supplied to the intermediate storage tank 15. It is something.

This flow rate difference will be returned to the condenser 1.

Therefore, if the flow rate difference becomes sign a in the figure, the opening degree of the flow control valve 20 becomes 10% or less, and if this flow rate difference continues for 30 seconds, the water level in the intermediate storage tank 15 is controlled to be constant. will be started.

This control ultimately determines the flow rate entering the intermediate storage tank 15 and the intermediate storage tank 1.
Since the flow rate in the condensate feed pipe 3 is made equal to the flow rate in the condensate feed pipe 3, the flow rate in the condensate feed pipe 3 substantially follows the curve vi.

When the total condensate flow rate becomes 90% or less, that is, when the flow rate difference reaches the sign shown in the figure, control is returned to control based on the rated flow rate of the condensate feed pump 4, that is, control that follows curve V.

According to this embodiment, in addition to the effects of the first embodiment, cavitation of the flow control valve 20 can be prevented.

Cavitation is caused by high flow velocity in the flow contraction part of the valve, causing the static pressure of the fluid to locally drop below the saturation pressure, generating bubbles, and in the subsequent stream, the flow velocity decreases and the static pressure saturates. This is a phenomenon in which bubbles are rapidly crushed when the pressure exceeds that level.

This bubble collapse phenomenon is accompanied by severe vibrations and noise, and
Since an impact pressure of Qata to 1QQata is generated, it causes erosion of the valve body and piping.

All currently used valves produce cavitation.

If a valve of a type that does not generate air even if cavitation occurs at a low opening degree is used, the capacity of the valve body will be small, and the number of valve bodies will eventually increase.

In any case, according to this embodiment, cavitation can be prevented as described above.

FIG. 6 is a system diagram of a condensate purification apparatus showing a third embodiment of the present invention.

The difference from the second embodiment is that the demineralization tower can also be controlled with equal flow rate.

Characteristic parts of the third embodiment will be explained below.

A flow rate detector 35 and a flow rate control valve 36 are attached to the upstream side of each demineralization tower 10, and a differential pressure detector 37 is attached to the demineralization tower 10 to detect the differential pressure between the upper and lower sides. A salt series 38 is formed.

Flow rate detector 35 is electrically connected to the input terminal of comparator 39.

The input terminal of the comparator 39 is also connected to the output terminal of the average value calculator 41.

The input terminal of the average value calculator 41 is connected to the output terminal of the comparator 22.

Further, the output terminal of the comparator 39 is connected to the flow rate control valve 36.

In this manner, in this embodiment, equal flow rate control between the condensate desalination series 38 is also performed.

The differential pressure in each demineralization tower 10 is detected by a differential pressure detector 37, and regenerated in the same manner as in the condensate purification line 5.

For example, the 100% flow rate when two pumps are operated is aml/mi.
n, and the total condensate flow rate actually detected by the flow rate detector 14 is bml/min (however, 90% of the rated flow rate).
below), the comparator 22 is (a −1)) m
A signal is issued commanding a flow rate increase of 1/min, which signal is equally distributed over a number of minutes in each of the condensate purification series 5 and the condensate desalination series 38.

For example, if two condensate purification series 5 are arranged as in the previous two embodiments, the series with the current flow rate cml/min will have an increase (decrease) in flow rate of ((a b)/2-c) ml/min.
In the series where n opening degree change is dml/min, the flow rate decrease (increase) is ((a-b)/2-d) ml/min
The opening degree is changed to control the flow rate between each column to be equal.

Further, the total flow rate after changing the opening degree of both columns is increased so that it becomes bml/min.

Exactly the same control is performed in the condensate desalination line 38 as well.

As described above, according to this embodiment, since the demineralization tower 10 can also be controlled to have a uniform flow rate, it has the effect that the demineralization capacity can be fully exhibited in the same way as the filtration tower.

In all of the above three embodiments, equal flow rate control between the purification series is performed by comparing the set flow rate and the total condensate flow rate, but as shown in Fig. 7, there is also a method that does not perform such a comparison. It is possible.

In the embodiment shown in FIG. 7, the output of the flow rate detector 14 is immediately connected to the average value calculator 40.

In this way, the condensate purification device can have a simpler structure.

Note that equal flow rate control in this case is performed as follows.

That is, the total condensate flow rate detected by the flow rate detector 14 is b
If it is ml/min, the average value calculator 40 divides it into the number of filtration towers 8. For example, if there are two filtration towers 8, a signal that should be b/2 ml/min per tower is output. .

When this signal is input to the comparator 26, the current flow rate C (or d) ml/min of each group and the b/2ml
/min, and the opening degree is adjusted according to the flow rate difference.

In other words, (1) / 2-c) ml 7ml
n (or (b/2-d) ml/min,
However, C1d) ml/min=bml/
From the relationship of min (c - uniform flow rate control between the columns is achieved.

Note that the present invention is not limited to the above-mentioned four types of embodiments, and for example, it is also possible to arrange a long series in parallel, which is a combination of the condensate purification series 5 and the condensate desalination series 38.
Further, the position of the flow rate detector 14 is not limited to the downstream side of the grand steam condenser 11, but may be any location where the total flow rate of condensate can be detected.

Furthermore, the number of condensate pumps 4 is not particularly limited.

As is clear from the above description, the present invention has the effect of controlling the flow rate to be equal between each purification tower with extremely good followability.

Furthermore, there is an effect that the control circuit is simpler than the conventional one.

[Brief explanation of drawings]

Figures 1, 3, 6, and 7 are all system diagrams of a condensate purification device according to an embodiment of the present invention, and Figure 2 is a characteristic diagram showing the performance of a condensate feed pump. 4 is a flowchart for explaining the control method of the embodiment of FIG. 3, and FIG. 5 is an explanatory diagram for explaining the control method of the embodiment of FIG. 3. 1...Condenser, 2...Hotwell,
3,16... Condensate feed pipe, 4,19...
・Condensate feed pump, 5... Condensate purification series, 6.
14. 35... Sound flow detector, 7. 20. 36
...Flow control valve, 8...Kawaro tower, 9,37
...Curve differential pressure detector, 1o, bend, desalination tower, 15...
・Intermediate storage tank, 17...Recovery water return pipe, 18...
Steam space communication pipe, 21... Water level detector, 22, 26
．． 39... Comparator, 23. 24...Tune setting device, 25...Setting value selector, 27...Valve opening degree regulator, 28, 29......Control switching device, 3o...Tune/valve opening degree detection Container, 31, 32...Converter, 38
・Song/Condensate desalination series, 40, 41...Average value calculator.

Claims (1)

[Claims] 1. In a condensate purification method in which condensate is purified by flowing through a plurality of condensate purification means arranged in parallel, and the condensate flow rate of each purification means is controlled to be equal flow rate, the condensate purification method The actual total amount of water flowing through the system is detected, the deviation from the set value corresponding to the predetermined target total amount of water flowing is determined, and the target for each purification means is determined according to the deviation. Set the condensate flow rate,
The actual condensate flow rate for each purification means is detected, and the deviation between this detected value and the target condensate flow rate is used to control the condensate flow rate control valve provided in series with each purification means until the deviation is the minimum. A condensate purification method characterized by controlling the condensate so that the 2. The condensate purification method according to claim 1, wherein the differential pressure is detected for each of the purification means and the purification means is regenerated based on the detected value. 3. Compare the actual total water flow rate with the set value to find the flow rate deviation, and divide this flow rate deviation by the number of purification means to obtain an average value and the actual recovery for each purification means. The condensate purification method according to claim 1 or 2, characterized in that the condensate flow rate control valve is controlled by comparing the flow rate with the flow rate of water. 4. The condensate purification method according to claim 3, wherein the set value of the target total flow rate of assembled water is a rated flow rate of a pump that causes condensate to flow into the purification means. 5 A condensate feed pump is disposed on a condensate feed pipe that opens to a condensate reservoir in a condenser, and a downstream feed pipe of the pump is configured to receive condensate from the condensate reservoir. The pump side is configured by alternately connecting main feed pipes that collectively flow in one pipe line and feed pipe distribution pipe groups in which the condensate flows in a distributed manner in a plurality of parallelly arranged pipe lines. In the condensate purification device, in which a condensate filtration tower, a condensate flow rate detector, and a condensate flow rate control valve are arranged for each distribution pipe in the distribution pipe group, the total condensate flow rate is measured on the main feed pipe. a first comparator which is provided with a detector and which compares a condensate total flow rate signal detected by the total flow rate detector with a predetermined set value and outputs the deviation; and a first comparator output signal. An average value calculation unit is provided which outputs a signal obtained by equally dividing the number of pipes into the number of pipes in the pump-side distribution pipe group, and the output signal of the calculation unit and the detection signal of the condensate flow rate detector provided for each of the distribution pipes are combined. A second comparator is attached to each dispersion pipe, and the second comparator is attached to each dispersion pipe to compare the difference signal and adjust the opening degree of the flow rate control valve on each dispersion pipe so that the difference signal is minimized. Features of condensate purification equipment. 6. The condensate purification device according to claim 5, wherein each of the condensate filtration towers is provided with a filtration tower differential pressure detector. 7. A second dispersion pipe group is disposed downstream of the pump-side dispersion pipe group via the feed pipe main pipe, and the dispersion pipe group includes a condensate desalination device and a second dispersion pipe for each dispersion pipe. a condensate flow rate detector and a second condensate flow rate control valve, and a second average value calculator that equally divides the total condensate flow rate into the number of pipes in the second distributed pipe group;
The output signal of the computing unit and the detection signal of each of the second condensate flow rate detectors are compared, and the opening degree of the second flow rate control valve on each distribution pipe is determined according to the difference signal. 7. The condensate purification device according to claim 5 or 6, wherein a third comparator is provided for each dispersion pipe to adjust the amount of water to a minimum. 8. The condensate purification device according to claim 5, wherein a setting device for setting the rated flow rate of the pump as the set value is attached to the first comparator. 9. Claim 8, wherein a plurality of the pumps are arranged in parallel, and a set value selector for changing the set value according to the number of operating pumps is attached to the first comparator. Condensate purification device as described in section. 10 In addition to the condensate reservoir at the bottom of the condenser, there is a second condensate reservoir, both sets of water reservoirs are connected by the condensate feed pipe, and purified condensate is supplied to the second condensate reservoir. The second part is sent to the boiler.
A condensate supply pipe and a condensate return pipe for returning the remainder of the purified condensate to the condenser are opened, and a condensate return pipe that returns the remainder of the purified condensate to the condenser is opened, and the condensate is removed from the container having the second condensate reservoir and the condenser. 6. The condensate purification device according to claim 5, wherein the space is also connected to piping. 11 A claim characterized in that a water level detector is attached to the container, and a condensate return flow rate control valve whose opening degree is adjusted based on a detection signal of the water level detector is attached on the condensate return pipe. The condensate purification device according to item 10. 12 A control switch is provided for inputting a fluctuating flow rate signal that maintains the water level in the container constant instead of the set flow rate signal according to the opening degree of the condensate return flow rate control valve, and the switch is connected to the water level detector. 12. The condensate purification device according to claim 11, further comprising a converter for converting a detection signal of the flow rate signal into a flow rate signal.