JP4077658B2 - Boiler operation support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boiler operation support apparatus that performs operation support for performing optimized operation of a boiler.
[0002]
[Prior art]
Conventional coal-fired boilers usually have a large influence on the design, operation, and maintenance depending on the properties of the coal to be fired. On the other hand, in recent coal-fired boilers, automation has progressed, and in order to continue the stable operation of the boiler even when the coal type changes, the plant type controller (hereinafter referred to as APC) in advance has its coal type. Select and use a program that sets the device state quantity that suits each property. However, since it is practically difficult to set a program for all the designed coals of several tens of coal types, among the designed coal types of the boiler, for example, high moisture coal, high fuel specific coal, low HGI coal, etc. Several types of coal (hereinafter referred to as representative coal) that are prominent in moisture, combustibility, grindability, etc. are actually subjected to combustion adjustment, load static characteristic test, and load dynamic characteristic test during trial operation in plant construction. For each type of coal, various state quantities appropriate for APC are set as programs. The program setting related to the combustion characteristics of the boiler in APC is mainly related to the boiler body, the burner air ratio, the economizer outlet O₂, Two-stage combustion ratio, air register opening, and the like, and in relation to a pulverized coal machine (hereinafter referred to as a mill), hydraulic pressure, mill rotary classifier rotational speed, and the like.
[0003]
Such program set values are not limited to the operation of each equipment, including plant start / stop and load changes. In terms of characteristics, boiler steam temperature characteristics, boiler outlet NOx, remaining in coal ash Then, unburned carbon (hereinafter referred to as unburned ash in the ash) that is taken out of the system and causes heat loss in the boiler thermal efficiency, carbon monoxide (CO) at the boiler outlet, etc. will not hinder the operation. It is set. In addition, because this setting is a multi-coal type boiler, it is necessary to ensure that it does not hinder the operation of coal types other than the representative coal as well. . In addition, when coal other than the representative coal is to be burned, the most suitable one is selected from several existing programs, and the boiler is operated by this selected program.
[0004]
[Problems to be solved by the invention]
By the way, in the boiler operation, the economizer outlet O₂That is, the setting of the air ratio of the combustion air has a different tendency depending on the type of coal, but generally the economizer outlet O₂When the set value of is decreased, the dry exhaust gas loss in the boiler heat loss is reduced, but the unburned amount in ash is increased and the unburned loss is increased. On the other hand, boiler outlet NOx concentration (O₂= 6%), and the power of the forced draft fan, the induction draft fan, and the desulfurization ventilator (hereinafter referred to as a large ventilator) also decreases. At the same time, economizer outlet O₂When the set value is decreased, sulfurization in the reducing atmosphere of the boiler (H₂S) There is also one aspect that promotes corrosion thinning of the boiler tube due to corrosion. Moreover, increasing the setting of the rotational speed of the mill dry-drying classifier improves the combustibility because the particle size of the pulverized coal charged into the boiler becomes finer, and the boiler outlet NOx, unburned in ash However, the power of the mill and the wear amount of the mill crushing roller and the segment tend to increase.
As described above, in accordance with changes in operating conditions, in fact, not only steam temperature characteristics, boiler outlet NOx, unburned ash content, boiler outlet CO, but also boiler thermal efficiency, power of large ventilators and mills (hereinafter referred to as in-house power) In addition, the amount of wear of the equipment such as corrosion thinning and wear of the equipment also changes.
[0005]
However, the conventional program set values are not optimal settings considering all these factors, and because they are positioned as multi-coal-type boilers, they are set with a margin. There is a problem that the optimum setting is not set for the representative coal itself.
In addition, in order to achieve optimal operation of boilers that support multiple coal types, not only steam temperature characteristics, boiler outlet NOx, unburned ash in boilers, boiler outlet CO, but also boiler thermal efficiency, in-house power, equipment Based on comprehensive judgment, including the amount of wear, the economizer outlet O₂And the set value of the mill dry-dry classifier should be determined, but conventionally, the amount of change in the wear of equipment has not been displayed in real time. There is also a problem that the rationality of the set value cannot be judged, and it is necessary to follow the operation by the program setting having a margin that is not necessarily optimal.
[0006]
This invention is made | formed in view of such a situation, and it aims at providing the boiler driving assistance apparatus which performs the driving assistance for performing the optimization driving | operation of a boiler.
[0007]
[Means for Solving the Problems]
  The invention described in claim 1O at the economizer exit ₂ In a power generation plant comprising a coal-fired boiler that is operation-controlled based on a set value of concentration, and a fuel supply device that is operated and controlled based on a set value of the rotational speed of a mill rotary classifier, the boiler A boiler driving support device that performs driving support, wherein the first driving power or current value of a fuel supply device that supplies fuel to the boiler is detected.State detection means;Based on the power or current value of the fuel supply device, a first amount of wear due to wear of a grinding roller or a segment of a mill that pulverizes coal constituting the fuel supply device is calculated by a predetermined calculation formula.Wear amount calculating means;Operating state detecting means for detecting the state of the boiler and the fuel supply device, operating cost calculating means for calculating an operating cost based on a value detected by the operating state detecting means, and wear of grinding rollers or segments of the mill The storage means for storing the wear amount and the repair cost associated with each other and the repair cost according to the wear amount calculated by the first wear amount calculation means is read from the storage means and the repair cost is acquired. Repair cost acquisition means and O of the economizer exit ₂ The concentration, the rotational speed of the mill rotary classifier, the detected value detected by the operating state detecting means, the operating cost, the amount of wear due to wear of the milling roller or segment of the mill, and the repair cost, On the same time axis during operation of the boilerAnd display means for displaying.
[0008]
  The invention described in claim 2Second state detection means for detecting the flow rate or flow rate of the combustion gas in the boiler and the soot concentration of the combustion gas, the boiler tube of the boiler based on the flow rate or flow rate of the combustion gas and the soot concentration of the combustion gas, or A second wear amount calculating means for calculating the wear amount of the tube protector by a predetermined calculation formula, and the storage means associates the wear amount of the boiler tube of the boiler or the tube protector with a repair cost. The repair cost acquisition means acquires the repair cost by reading the repair cost according to the wear amount calculated by the second wear amount calculation means from the storage means, and the display means Repair cost according to the wear amount of the boiler tube or the tube protector of the boiler and the wear amount calculated by the second wear amount calculating means. Wherein said displaying on the same time axis.
[0009]
  The invention according to claim 3H in the combustion gas in the boiler ₂ Third state detecting means for detecting S concentration, and H in the combustion gas ₂ A third wear amount calculating means for calculating a wear amount due to corrosion thinning of the water-cooled wall pipe of the boiler based on an S concentration by a predetermined calculation formula, and the storage means includes a water-cooled wall of the boiler The amount of wear due to the corrosion reduction of the pipe and the repair cost are stored in association with each other, and the repair cost acquisition means stores the repair cost according to the wear amount calculated by the third wear amount calculation means from the storage means. The display means obtains the amount of wear due to corrosion thinning of the water-cooled wall pipe of the boiler and the repair cost according to the amount of wear calculated by the third wear amount calculating means. Display on the same time axis.
[0011]
  Claim4The invention described in the aboveUsed in the first, second and third wear amount calculation meansCalculation formula is pastThe fruitA correction coefficient based on the result value is multiplied.
[0020]
  Claim5The invention described inSaidDue to changes in the properties of the fuel supplied to the boiler,By the first, second and third state detection meansThe detected amount,According to the first, second and third wear amount calculating meansThe amount of wear,According to the repair cost calculation meansDetection means for detecting that any of the repair costs exceeds a predetermined threshold value, and operation control is performed so that each value does not exceed the threshold value according to the detection result. It further comprises setting value output means for changing a setting value for performing and outputting the setting value to the operation control device.
[0021]
  Claim6In the invention described in the above, the set value output means includes:Total of the operating cost and the repair costThe set value is changed so as to minimize the cost.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a boiler operation support device according to an embodiment of the present invention will be described with reference to the drawings. First, with reference to FIG. 1, the structure of the whole plant of the coal boiler corresponding to the multi-coal type for electric power generation is demonstrated. FIG. 1 is a block diagram showing the overall configuration of a multi-coal type-compatible coal boiler. In this figure, reference numeral 1 is a mill for pulverizing coal, which is fuel for a boiler, and has a segment 2 and a roller 3. Reference numeral 4 denotes a mill rotary classifier, which supplies pulverized coal B to the boiler 5. Reference numeral 6 is a boiler water-cooled wall pipe provided on the wall surface of the boiler 5. Reference numeral 7 denotes a economizer, and an economizer outlet O₂O concentration at the outlet by the concentration measuring device 8₂The concentration is measured. Reference numeral 9 denotes a denitration device ammonia injector for injecting ammonia into the denitration device 11. The code | symbol 10 is a boiler exit NOx measuring device which measures the NOx density | concentration of a boiler exit. Reference numeral 12 denotes an air preheater that preheats the combustion air A with exhaust gas. Reference numeral 13 denotes an air preheater outlet gas temperature measuring device. The exhaust gas is discharged from the chimney 18 to the atmosphere via the EP 14, the induction fan 15, the desulfurization fan 16, and the desulfurization device 17. Reference numeral 19 denotes a forced draft fan that supplies combustion air A. The configuration shown in FIG. 1 is a general power generation multi-coal compatible / coal boiler plant, and therefore detailed description thereof is omitted here.
[0023]
Next, the configuration of the boiler operation support apparatus will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration of an embodiment of the boiler operation support apparatus. In this figure, the code | symbol 21 is a plant general control apparatus (henceforth APC), and the exit O of the economizer 7 as a setting value.₂The concentration or the rotational speed of the mill rotary classifier 4 is input, and the operation of the boiler 5 is controlled based on this set value. Reference numeral 22 denotes a control computer that controls combustion in the boiler 5. Reference numeral 23 denotes an operation data processing computer that performs data processing of operation data obtained during operation of the boiler 5. Reference numeral 24 denotes a driving support device that calculates the amount of wear of the equipment constituting the boiler 5 and displays the operating state of the boiler 5 on the screen. Reference numeral 25 denotes a measurement data group measured at each part of the plant shown in FIG. 1, and is notified to the driving support device 24 via the control computer 22 and the driving data 23.
[0024]
Next, the operation of the driving support device 24 shown in FIG. 2 will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the driving support device 24. First, the driving support device 24 is connected to the economizer outlet O.₂The set value of the density and the set value of the rotation speed of the classifier are changed and output to the control computer 22 (step S1). When this operation is at the time of starting operation, a predetermined value is output to the control computer 22.
[0025]
Next, the driving support device 24 acquires the measurement data of the operating state detected in each part of the plant through the control computer 22 and the operation data processing computer 23 (step S2). The measurement data acquired here is the economizer outlet O₂, Unburned ash, air preheater outlet gas temperature, boiler outlet NOx, in-house power, and the like. Subsequently, the driving support device 24 calculates the boiler thermal efficiency, the plant thermal efficiency coal supply amount, the ash processing amount, and the like and the wear amount of the equipment constituting the boiler based on the acquired measurement data group 25 (step S3). . The amount of equipment wear calculated here is the amount of corrosion thinning per unit time of the boiler water-cooled wall pipe, the amount of wear per unit time of the boiler tube or tube protector, and the amount of wear per unit time of the milling roller and segment. It is. The amount of equipment wear obtained by this calculation is corrected and updated based on the actual value of the amount of wear performed when the boiler 5 is stopped (step S4).
[0026]
Here, a calculation formula for obtaining each amount of wear will be described. The amount of corrosion wall thinning of the boiler water-cooled wall₂It is known that the amount of wear of the boiler tube or the tube protector is related to the concentration of soot in the boiler combustion gas and the combustion gas flow rate or the combustion gas flow rate, which can be measured or calculated. Further, the wear amount of the mill grinding roller and the segment can be obtained by calculation because it is related to the power or current of the mill that can be obtained by measurement. Therefore, it is possible to indirectly determine the amount of equipment wear per unit time in real time by measuring and calculating each state quantity in real time without directly measuring the amount of wear after stopping the boiler operation. Is possible.
[0027]
<Corrosion thinning amount per unit time of boiler water-cooled wall pipe>
The corrosion thinning amount W [mm / hour] per unit time of the boiler water-cooled wall tube is calculated by the equation (1).
W = Wa × S^α× K (1)
However,
Wa: Unit H in the relevant or similar design / preceding boiler₂Unit per S concentration
Actual amount of water-cooled wall pipe corrosion per hour [mm / hour]
S: H in the boiler combustion gas₂S concentration [ppm]
α: multiplier specific to the boiler
K: Correction coefficient specific to the boiler
It is.
Unit H in the relevant or similar design / preceding boiler₂You may make it update the numerical value of the actual corrosion amount Wa of the water-cooled wall pipe | tube per S density | concentration reflecting the result measured at the time of the said boiler stop. Further, the corrosion thinning amount may be a change amount per unit time.
[0028]
<Amount of wear per unit time of boiler tube or tube protector>
The wear amount W [mm / hour] per unit time of the boiler tube or the tube protector is calculated by the equation (2).
W = Wa × (C / Ca) × (V / Va)^β× K (2)
However,
Wa: Actual wear amount per unit time of the boiler tube or tube protector in the relevant or similar design / preceding boiler [mm / hour]
C: Dust concentration of the combustion gas of the boiler [g / m^Three]
Corresponding to Ca: Wa or similar design / past boiler combustion gas soot concentration [g / m^Three]
V: Combustion gas flow rate [m / hour] of the boiler,
Or combustion gas flow [m^ThreeN / hour]
(The unit of combustion gas flow rate is [m^Three/ Hour]. )
Va: Combustion gas actual flow velocity [m / hour] of the relevant or similar design / preceding boiler corresponding to Wa, or actual combustion gas flow rate [m^ThreeN / hour], [m^Three/time]
β: multiplier specific to the boiler
K: Correction coefficient specific to the boiler
It is.
The numerical value of the actual wear amount Wa per unit time of the boiler tube or the tube protector in the same or similar design / preceding boiler may be updated to reflect the result measured when the boiler is stopped. The wear amount may be a change amount per unit time.
[0029]
<Abrasion amount per unit time of mill grinding roller and segment>
The abrasion amount W [mm / hour] per unit time of the mill crushing roller and the segment is calculated by the equation (3).
W = Wa × (A / Aa) × K (3)
However,
Wa: Actual wear amount per unit time [mm / hour] of roller and segment of the same or similar design / preceding mill
A: Power of the mill [kWh] or current value [A]
Aa: Corresponding to Wa or similar design / Power of preceding mill [kWh]
Or current [A]
K: Correction factor specific to the mill
It is.
Note that the numerical value of the actual wear amount Wa per unit time of the roller or segment of this or similar design / preceding mill may be updated to reflect the result measured when the boiler is stopped. The wear amount may be a change amount per unit time.
[0030]
Next, the driving assistance device 24 displays the operation state quantity of the boiler 5 on the same time axis and in real time (step S5). Here, the operating state quantity to be displayed is the economizer outlet O₂Concentration, rotational speed of mill rotary classifier, boiler outlet NOx, unburned ash content, in-house power (electric power consumed by ventilator and mill), ammonia injection amount, boiler thermal efficiency, plant thermal efficiency, coal supply, ash Disposal amount, equipment wear amount per unit time (water-cooled wall pipe corrosion amount, boiler tube or tube protector wear amount, mill roller / segment wear amount) and repair cost, fuel cost, ammonia cost, ash treatment cost corresponding to this wear amount , In-house power costs and the total of these costs. FIG. 4 shows a display example of the screen. Here, the unit of the vertical axis is not specified, but each value may be displayed so that it can be read. In addition, the repair cost is calculated in advance by calculating the relationship between the amount of wear and the repair cost, storing the calculated repair cost in advance in the driving support device 24 in relation to the amount of wear. This is realized by reading out the repair cost corresponding to the amount of wear.
[0031]
Next, the driving support device 24 determines for each driving state quantity whether all the driving state quantities exceed a predetermined threshold (step S6). As a result of this determination, when there is at least one operating state quantity that exceeds the threshold value, the driving support device 24 determines that the economizer outlet O₂The set value of the density and the set value of the rotation speed of the classifier are changed to the previous set values (step S7), and the process returns to step S1.
[0032]
On the other hand, when all the driving state quantities do not exceed the threshold value, the driving support device 24 stores therein the current set value and the average value of the total cost (step S8). Then, the driving support device 24 determines whether the amount of data (set value and total cost) stored therein is sufficient. If the result is not sufficient, the process returns to step S1 to repeat the process. If the data amount is sufficient, the driving support device 24 selects a minimum value and a setting value corresponding to the minimum value from the average value of the total costs stored inside (step S10).
[0033]
Next, the driving support device 24 determines whether the selected setting value is a setting value for optimum driving (step S11). As a result of this determination, if it is not the set value for optimum operation, the optimum set value is set (step S12). Then, the set value selected or set is set as the final set value (step S13).
[0034]
For the change of the set value, the tendency of various state quantity changes when the set value is changed in the boiler having the predetermined performance or for each property of the fuel is obtained in advance and stored, and this stored information The change value may be selected based on the above. Fig. 5 shows the economizer outlet O₂It is a figure which shows the various state quantity changes accompanying a density | concentration change. In this figure, the horizontal axis represents the economizer outlet O.₂The density [%] is shown, and the vertical axis shows the value of each state quantity. Such economizer outlet O₂By preparing or storing data defining the relationship between the concentration and various state quantities for each fuel property, and selecting and selecting fuel property data having performances that are close to each other, the optimum operation can be achieved at an early stage. It is possible to migrate. Moreover, FIG. 6 is a figure which shows the various state-quantity changes accompanying a mill rotation classifier rotation speed change. In this figure, the horizontal axis indicates the mill rotary classifier rotation speed [rpm], and the vertical axis indicates the value of each state quantity. The set value of the rotational speed of the mill rotary classifier is also the economizer outlet O₂Similar to the concentration, it may be prepared or stored for each property of the fuel, and the set value may be changed based on data indicating a close tendency.
[0035]
Thus, since the operation state of the boiler is displayed on the same screen in real time, the operator who performs operation management can easily grasp the operation state. In particular, the economizer outlet O where the operator changes the set value by manual intervention.₂In addition to the rotational speed of the mill rotary classifier, the boiler thermal efficiency based on the loss method, the amount of coal supply calculated using it, and the boiler outlet NOx concentration (O₂= 6% conversion) and the ammonia injection amount in the corresponding denitration equipment, and the intruder, induction fan, desulfurizer, power or current value of the mill, unburned ash content, ash treatment amount, etc. Boiler water-cooled wall tube, boiler tube, tube protector, mill grinding roller and segment wear / repair cost per unit time, fuel cost, ammonia cost, ash treatment cost, in-house power cost, and the total of these costs are the same screen Since it is displayed above, the operator can grasp the driving state from various angles, and can perform the optimum driving based on the displayed driving state.
[0036]
Next, details of the operation in which the driving support device 24 changes the set value will be described.
First, in the boiler in operation, when the properties of the burning coal change,₂The operation of automatically finding the optimum setting value by changing the density will be described. Economizer outlet O₂In principle, the concentration set value is changed by changing the set value at an appropriate interval with an amount of change that does not cause disturbance in the operation of the operating boiler. At this time, the economizer outlet O₂Boiler thermal efficiency based on the loss method in which the state quantity changes as the concentration set value changes, the amount of coal supply calculated by that, and the boiler outlet NOx concentration (O₂= 6% conversion) and the amount of ammonia injected in the corresponding denitration equipment, in-house power and ash treatment amount, as well as the amount of equipment wear per unit time calculated in real time. Economizer outlet O until the most reasonable operating condition₂The density setting is automatically changed. The overall most reasonable operation here refers to the amount of wear and the amount of wear per unit time that does not exceed a preset threshold among the items in which each state quantity changes. Assuming that the cumulative sum of the amount of wear obtained by multiplying the amount of wear by the planned time until the next equipment stoppage is a value that does not lead to equipment failure, the amount of coal supply and the amount of ammonia injected In other words, the operation is performed so that the total cost per unit time corresponding to the in-house power, the ash treatment amount, and the wear amount of the equipment is minimized.
[0037]
In addition, economizer outlet O₂In the process of concentration change, when one of the items whose state quantity changes, the threshold is exceeded, or the next equipment stop planned for the existing wear amount and the wear amount of the equipment per unit time When the sum of the cumulative amount of wear multiplied by the operating time up to exceeds the value leading to equipment failure, or the economizer outlet O set in advance₂When the concentration target value is reached, the economizer outlet O₂Stops changing the density setting value automatically. Further, when the change stops exceeding the threshold value, the economizer outlet O immediately before the change is stopped.₂Automatically return to the density setting. Economizer outlet O₂From the time when the concentration is changed to the time when it is determined that the data for selecting the optimum set value can be obtained, the average value of the total cost during the appropriate interval and the corresponding economizer outlet O₂Memorize the concentration. Then, at the time when it is determined that data capable of selecting the optimum set value has been acquired, the minimum value and the economizer exit O at that time are selected from the stored average values of the total costs during the appropriate interval.₂Select the concentration automatically. The selected economizer outlet O with a change amount that does not cause disturbance of operation and with an appropriate interval₂Automatically change until By doing in this way, since it becomes possible to select and set an optimal setting value, the optimal operation of a boiler is attained as a result.
[0038]
Next, the operation of automatically finding the optimum set value by automatically changing the rotational speed of the mill rotary classifier when the properties of the coal to be changed in the operating boiler will be described. Changing the rotational speed of the mill rotary classifier is to change the set value of the rotational speed of the mill rotary classifier automatically at an appropriate interval with a change amount that does not cause disturbance of operation in the operating boiler. It is a principle. At this time, with the change in the rotational speed of the mill rotary classifier, the boiler thermal efficiency based on the loss method in which the state quantity changes, the coal supply amount calculated thereby, and the boiler outlet NOx concentration (O₂= 6% conversion) and the amount of ammonia injected in the corresponding denitration equipment, in-house power and ash treatment amount, as well as the amount of equipment wear per unit time calculated in real time. The setting value of the rotational speed of the mill rotary classifier is automatically changed until the most reasonable operating condition is achieved.
[0039]
Also, in the process of changing the rotational speed of the mill rotary classifier, when one of the items whose state quantity changes, the threshold is exceeded, or the amount of wear and the amount of equipment worn per unit time On the other hand, when the sum of the cumulative amount of wear obtained by multiplying the planned operation time until the next equipment stop exceeds the numerical value that leads to equipment failure, or the preset mill rotary classifier When the target value of the rotational speed is reached, the changing operation of the setting value of the rotational speed of the mill rotary classifier is automatically stopped. Further, when the change stops after exceeding the threshold value, it is automatically returned to the set value of the rotational speed of the immediately preceding mill rotary classifier. The average value of the total cost during the appropriate interval from the time when the rotational speed of the mill rotary classifier is changed to the time when it is determined that the data that can select the optimum setting value has been acquired, and the corresponding mill The rotational speed of the rotary classifier is stored. Then, at the time when it is determined that data capable of selecting the optimum setting value has been acquired, the minimum value and the mill rotary classifier at that time are selected from the stored average values of the total costs during the appropriate interval. Automatic selection of rotation speed. By doing in this way, since it becomes possible to select and set an optimal setting value, the optimal operation of a boiler is attained as a result.
[0040]
As described above, the economizer outlet O in which the set value is changed by manual intervention in the operating boiler.₂The boiler thermal efficiency based on the loss method, the amount of coal supply calculated from the loss method, and the NOx concentration of the boiler outlet (O₂= 6% conversion) and the corresponding amount of ammonia infusion in the NOx removal system corresponding to it, in-house power and ash treatment amount, as well as quantitative changes in equipment wear per unit time due to changes in boiler operating conditions and corresponding to them By calculating all the costs to be performed in real time and displaying them on the same time axis on the same screen, it becomes possible to use as an index of the set value change operation aimed at the optimum operation of the operation management worker. Moreover, based on each state quantity obtained by calculation or measurement, the economizer outlet O is automatically set at an appropriate interval with a change amount that does not cause disturbance of the boiler operation.₂Since the concentration set value is automatically changed, optimal operation control can be easily performed without complicated operation.
[0041]
It should be noted that a program for realizing each function shown in FIG. 3 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute boiler operation support processing. You may go. Here, the “computer system” includes an OS and hardware such as peripheral devices. Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.
[0042]
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.
[0043]
【The invention's effect】
As described above, according to the present invention, in the operation of the boiler, the economizer outlet O₂In addition to the various state quantities that change with the change in the set value of the rotational speed of the mill rotary classifier, that is, boiler thermal efficiency, boiler outlet NOx, in-house power, ash throughput, equipment corrosion per unit time Since the change in the amount of wear is displayed in real time, it is possible to find an optimal operation setting based on comprehensive judgment, and the effect that more rational operation is possible can be obtained. In addition, since the amount of corrosion and wear of the equipment per unit time is calculated and displayed, it can be used as an evaluation of remaining life for each equipment. Inspections, inspections, and repairs can be made at a planned time, which can contribute to improving the reliability of the plant.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an overall configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention.
FIG. 3 is a flowchart showing an operation of the driving support device 24 shown in FIG.
FIG. 4 is a screen display example in the driving support device 24;
[Fig.5] Eco-saving device outlet O₂It is explanatory drawing which shows the state quantity change accompanying a density change.
FIG. 6 is an explanatory view showing a state quantity change accompanying a mill rotary classifier rotational speed change.
[Explanation of symbols]
21 ... APC (Plant General Control Equipment)
22 ... Control computer
23 ... Operating data processing computer
24 ... Driving support device
25 ... Measurement data group

Claims (6)

Power generation comprising a coal-fired boiler that is operated and controlled based on a set value of the O ₂ concentration at the outlet of the economizer, and a fuel supply device that is controlled and operated based on a set value of the rotational speed of the mill rotary classifier A boiler operation support device for supporting operation of the boiler in an industrial plant,
First state detection means for detecting power or current value of a fuel supply device for supplying fuel to the boiler ;
A first wear amount calculation that calculates a wear amount due to wear of a grinding roller or a segment of a mill that crushes the coal constituting the fuel supply device based on a power or current value of the fuel supply device, according to a predetermined calculation formula. Means,
An operation state detecting means for detecting states of the boiler and the fuel supply device;
An operating cost calculating means for calculating an operating cost based on a value detected by the operating state detecting means;
Storage means for storing the amount of wear due to wear of the milling roller or segment of the mill and the repair cost in association with each other;
Repair cost acquisition means for acquiring a repair cost by reading a repair cost corresponding to the wear amount calculated by the first wear amount calculation means from the storage means;
According to the O ₂ concentration at the outlet of the economizer, the rotational speed of the mill rotary classifier, the detected value detected by the operating state detecting means, the operating cost, and the wear of the mill grinding roller or segment. A boiler operation support apparatus , comprising: a display unit that displays the amount of wear and the repair cost on the same time axis during operation of the boiler. Second state detection means for detecting the flow velocity or flow rate of the combustion gas in the boiler and the dust concentration of the combustion gas;
A second wear amount calculating means for calculating a wear amount of the boiler tube or the tube protector of the boiler based on a flow velocity or flow rate of the combustion gas and a dust concentration of the combustion gas by a predetermined calculation formula;
In the storage means, the amount of wear of the boiler tube or the tube protector of the boiler and the repair cost are stored in association with each other,
The repair cost acquisition unit acquires the repair cost by reading the repair cost according to the wear amount calculated by the second wear amount calculation unit from the storage unit,
The display means displays the wear amount of the boiler tube or the tube protector of the boiler and the repair cost according to the wear amount calculated by the second wear amount calculation means on the same time axis. The boiler operation support device according to claim 1. Third state detecting means for detecting the H ₂ S concentration in the combustion gas in the boiler ;
A third wear amount calculating means for calculating a wear amount due to corrosion thinning of the water-cooled wall pipe of the boiler based on the H ₂ S concentration in the combustion gas by a predetermined calculation formula;
In the storage means, the amount of wear due to corrosion thinning of the water-cooled wall pipe of the boiler and the repair cost are stored in association with each other,
The repair cost acquisition unit acquires the repair cost by reading the repair cost corresponding to the wear amount calculated by the third wear amount calculation unit from the storage unit,
The display means displays the amount of wear due to corrosion thinning of the water-cooled wall tube of the boiler and the repair cost according to the amount of wear calculated by the third wear amount calculation means on the same time axis. The boiler operation support apparatus according to claim 2 . The first calculation equation used in the second and third wear amount calculating means, the boiler driving support apparatus according to claim 3, characterized in that the correction factor based on past actual績値is multiplied. By nature of the fuel supplied to the boiler is changed, the wear due to said detected amount by the first, second and third state detecting means, said first, second and third wear amount calculating hand stage Detecting means for detecting that any of the repair costs by the amount, the repair cost calculating means exceeds a predetermined threshold value;
A set value output means for changing a set value for performing operation control so that each value does not exceed a threshold value according to the detection result, and outputting the set value to the operation control device; The boiler operation support device according to claim 4 , wherein the boiler operation support device is provided. 6. The boiler operation support apparatus according to claim 5 , wherein the set value output means changes the set value so that a total cost of the operation cost and the repair cost is minimized.

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