JP4936759B2 - Control device - Google Patents

Description

  The present invention relates to a control device that controls, for example, a coal combustion device.

  When coal is burned in a coal combustion device, exhaust gas and coal ash are produced. The exhaust gas passes through a flue having an air heater, an electrostatic precipitator, etc., and is discharged out of the coal combustion apparatus. The exhaust gas contains sulfur oxides that corrode the side walls of the flue and the like, and as a result of the corrosion by the sulfur oxides, the flue may cause a blockage failure. On the other hand, coal ash contains heavy metals such as chromium as trace elements, and these heavy metals may be eluted from the coal ash to the outside.

In order to reduce the possibility of the obstruction of the flue, an additive consisting of magnesium hydrogen carbonate or an aqueous solution of calcium hydrogen carbonate is added to the flue in the combustion air, in the combustion device, downstream of the combustion device, etc. It is known to perform the neutralization treatment (see Patent Document 1). According to this neutralization treatment, sulfur oxides generated by the use of coal can be removed efficiently and safely.
JP 2002-52311 A

  However, the above-mentioned additives are not added to coal for the purpose of suppressing heavy metals from eluting to the outside. Here, considering the use of additives in coal for the purpose of reducing the possibility of heavy metals leaching to the outside from coal ash, in order to obtain a sufficient leaching prevention effect, depending on the amount of coal ash generated It is necessary to add a predetermined amount or more of additives. On the other hand, if an excessive amount of additive is added to coal, heat transfer inhibition due to boiler slacking may occur due to the additive. From the point of view of the manager of the coal combustion equipment, it is necessary to purchase unnecessary additives and to take unnecessary countermeasures against corrosion, and to operate the coal combustion boiler as compared with the case where the minimum amount of additive is added. Economic efficiency is inferior. Therefore, the manager is required to provide a control device that can adjust the amount of the additive added to the coal combustion device to the minimum necessary amount.

  The objective of this invention is providing the control apparatus which can adjust the quantity of the additive added to a coal combustion boiler to the minimum necessary quantity.

  More specifically, the present invention provides the following.

  (1) A coal-fired boiler, and an elution inhibitor for adding to the coal an elution inhibitor for preventing heavy metals contained in coal ash generated by burning coal in the coal-fired boiler from leaching to the outside. An addition device, and a control device for controlling the coal combustion device, the ash content data storing means for storing the ash content data corresponding to the ash content contained in the coal, and the concentration of the predetermined metal element contained in the coal Concentration data storage means for storing corresponding concentration data, consumption data storage means for storing consumption data corresponding to the consumption of coal consumed in the coal combustion boiler, ash content data, concentration data, and The addition amount calculating means for calculating the addition amount of the elution inhibitor based on the consumption data, and the addition amount calculation means for the elution inhibitor addition device. The out the amount of elution preventive agent and the addition amount control means for controlling the addition of the coal, the control apparatus comprising: a.

  According to the invention of (1), the coal combustion apparatus has an elution inhibitor adding apparatus for adding an elution inhibitor to the coal, and the addition amount control means is ash data, concentration for the elution inhibitor addition apparatus. Control is performed to add an amount of dissolution inhibitor calculated based on the data and consumption data. As a result, the amount of the elution inhibitor added to the coal from the elution inhibitor addition device can be minimized, so that the possibility of heavy metals eluting from the coal ash to the outside can be reduced, and an excessive amount It is possible to suppress the occurrence of heat transfer inhibition due to boiler slacking by adding an elution inhibitor. Therefore, it is not necessary to purchase unnecessary additives or perform unnecessary heat transfer inhibition measures, so that the burden on the administrator can be reduced and the use cost of the coal combustion apparatus can be suppressed.

  (2) The control device according to (1), further comprising a concentration calculation unit that calculates a concentration of the predetermined metal element contained in the coal ash based on the ash data and the concentration data, and the addition amount calculation The control device calculates the addition amount of the elution inhibitor on the condition that the concentration of the predetermined metal element calculated by the concentration calculation device is less than a predetermined concentration.

  According to the invention of (2), the addition amount calculating means calculates the addition amount of the elution inhibitor when the concentration of the predetermined metal element contained in the coal ash is less than the predetermined concentration, and the predetermined concentration If it is not less than that, the addition amount of the dissolution inhibitor is not calculated. As a result, particularly when the concentration of the predetermined metal element is not less than the predetermined concentration, elution of heavy metal can be prevented without using an elution inhibitor, and as a result, the use cost of the coal combustion apparatus can be suppressed. Can do.

  (3) In the control device according to (1) or (2), a load fluctuation determination unit that determines whether or not a load applied to a generator connected to the coal combustion boiler is fluctuating, and the load fluctuation determination. Consumption data switching means for switching the consumption data stored in the consumption data storage means to another consumption data on condition that the load is determined to be changed by the means. Control device characterized.

  According to the invention of (3), the amount of the elution inhibitor added to the coal ash recovery silo from the elution inhibitor addition device can be switched according to the load applied to the generator. In addition, it is possible to suppress the elution of heavy metals from the coal ash due to the lack of the elution inhibitor. On the other hand, when the load is reduced, the corrosion of the coal combustion apparatus due to the addition of an excessive amount of the dissolution inhibitor can be suppressed. Therefore, the burden on the manager can be reduced and the use cost of the coal combustion apparatus can be suppressed.

  (4) In the control device according to any one of (1) to (3), a coal type change determining unit that determines whether or not a type of coal to be input to the coal combustion boiler is changed, and the coal type Changed by the ash content data switching means for switching the ash content data stored by the ash content data storage means to another ash content data and the coal type change determination means, on condition that it is determined that the change is determined by the change determination means. And a density data switching means for switching density data stored by the density data storage means to another density data on the condition that the density data is determined to be.

  According to invention of (4), when the kind of coal thrown into a coal combustion boiler is changed, the quantity of the elution inhibitor added to a coal ash collection | recovery silo can be switched from an elution inhibitor addition apparatus. Thereby, when the density | concentration of the predetermined | prescribed metal element contained in the coal after a change is low compared with the density | concentration before a change, it can suppress that a heavy metal elutes from coal ash by the lack of an elution inhibitor. On the other hand, when the concentration of the predetermined metal element contained in the coal after the change is higher than the concentration before the change, the corrosion of the coal combustion apparatus due to the addition of an excessive amount of the dissolution inhibitor can be suppressed. Therefore, the burden on the manager can be reduced and the use cost of the coal combustion apparatus can be suppressed.

  (5) In the control device according to (4), the coal combustion device has a plurality of coal silos for storing the coal, and inputs coal to the coal combustion boiler by an input operation of an administrator. A selection signal receiving means for receiving a selection signal, a coal silo data storage means for storing coal silo data corresponding to the selection signal among the plurality of coal silos, and a selection signal by the selection signal receiving means. Is received, the coal silo data corresponding to the selection signal received from the selection signal receiving means and the coal silo data storage are stored on the condition that the coal silo data is stored in the coal silo data storage means. Comparing means for comparing the data of the coal silo stored in the means, wherein the coal type change determining means is selected by the comparing means. On the condition that the coal silo data corresponding to the selection signal received from the signal receiving means and the coal silo data stored in the coal silo data storage means are determined to be different data. It is discriminated that the type of coal to be fed into the tank has been changed.

  According to the invention of (5), it is determined that the coal silo data corresponding to the selection signal received from the selection signal receiving means is different from the coal silo data stored in the coal silo data storage means. When the concentration of the predetermined metal element contained in the subsequent coal is lower than the concentration before the determination, it is possible to prevent heavy metals from eluting from the coal ash due to the lack of the dissolution inhibitor. On the other hand, the coal silo data corresponding to the selection signal received from the selection signal receiving means and the coal silo data stored in the coal silo data storage means are included in the coal after being determined to be different data. When the concentration of the predetermined metal element to be determined is higher than the concentration before the determination, the corrosion of the coal combustion apparatus due to the addition of an excessive amount of the dissolution inhibitor can be suppressed. Therefore, the burden on the manager can be reduced and the use cost of the coal combustion apparatus can be suppressed.

  (6) In the control device according to (5), each of the plurality of coal silos includes a storage amount measuring device for measuring the amount of stored coal, and the coal type change determination unit includes: The coal combustion boiler is provided on the condition that the amount of coal stored in the coal silo corresponding to the coal silo data stored by the coal silo data storage means is measured by the storage amount measuring device to be zero. It is discriminated that the type of coal to be fed into the tank has been changed.

  According to the invention of (6), the concentration of the predetermined metal element contained in the coal after the amount of coal stored in the coal silo is measured to be zero by the storage amount measuring instrument is not measured. When it is lower than the concentration, it is possible to prevent heavy metals from eluting from the coal ash due to the lack of the elution inhibitor. On the other hand, when the concentration of the predetermined metal element contained in the coal after it is measured that the amount of coal stored in the coal silo is zero by the storage amount measuring instrument is higher than the concentration before the measurement In addition, corrosion of the coal combustion apparatus due to the addition of an excessive amount of the dissolution inhibitor can be suppressed. Therefore, the burden on the manager can be reduced and the use cost of the coal combustion apparatus can be suppressed.

  (7) In the control device according to any one of (4) to (6), the control device according to any one of (4) to (6) further includes a timing unit that counts time when it is determined that the coal type change determination unit has changed. The means switches the ash data to another ash data on the condition that a predetermined time is measured by the time measuring means, and the concentration data switching means is configured to measure a predetermined time by the time measuring means. A control device that switches the density data to another density data according to a condition.

  According to the invention of (7), even if it is determined that the coal type change determining means has changed, the ash content is switched by the ash data switching means and the concentration data switching means until the time measuring means counts the predetermined time. Data and density data are not switched. As a result, the ash content data before the change is determined until the coal ash generated after the combustion of the changed coal is actually stored in the coal ash recovery silo after the change is determined by the coal type change determination means. And an elution inhibitor can be added based on the concentration data. Therefore, the amount of the elution inhibitor added to the coal ash recovery silo from the elution inhibitor addition device can be more strictly defined.

  (8) In the control device according to any one of (1) to (7), the control device has an input port for supplying the coal, and is added from the coal input from the input port and the elution inhibitor adding device. A mixing device for mixing the elution inhibitor, and a sensor for detecting that the coal is being charged from the charging port to the mixing device is provided in the vicinity of the charging port. And a detection determination unit that determines whether or not the addition amount control unit performs control to add the elution inhibitor to the coal on the condition that it is determined that the detection determination unit detects the addition. A control device characterized by that.

  According to the invention of (8), even if the addition amount of the elution inhibitor is calculated by the addition amount calculation means, until the sensor detects that coal is being introduced from the elution inhibitor addition device to the mixing device. Does not add the dissolution inhibitor from the dissolution inhibitor addition apparatus to the mixing apparatus. Therefore, the amount of the dissolution inhibitor added from the dissolution inhibitor adding device to the mixing device can be more strictly defined.

  (9) In the control device according to any one of (1) to (8), the coal combustion device is configured to remove sulfur compounds contained in exhaust gas generated by burning coal in the coal combustion boiler. A desulfurizer and a neutralizer addition device for adding a neutralizer to the desulfurizer, both the elution inhibitor and the neutralizer are limestone, and the predetermined metal element is calcium. The control device characterized by being.

  According to the invention of (9), since limestone is cheaper than other substances suitable as an elution inhibitor, coal ash can be processed at a low cost. In general, when coal is burned in a coal-fired boiler, exhaust gas is generated. Since this exhaust gas contains sulfur oxides, desulfurization treatment is required. Limestone can be used. Therefore, in terms of equipment, there is no need to separately provide a silo for storing the anti-elution agent and a silo for storing the neutralizing agent, so that the equipment cost can be reduced and the maintenance management of the silo can be saved. Can be achieved. In terms of management, the same material can be ordered in large quantities. As a result, the cost of raw materials can be reduced, and the number of brands necessary for inventory management can also be reduced.

  According to the present invention, since the amount of the elution inhibitor added to the coal ash recovery silo from the elution inhibitor addition device can be minimized, it is possible to reduce the possibility of heavy metals eluting from the coal ash to the outside. In addition, the addition of an excessive amount of an elution inhibitor can suppress the occurrence of heat transfer inhibition due to boiler slacking. Therefore, it is not necessary to purchase unnecessary additives or perform unnecessary corrosion countermeasures, so that the burden on the administrator can be reduced and the use cost of the coal combustion apparatus can be suppressed.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. This is merely an embodiment, and the technical scope of the present invention is not limited to this.

  FIG. 1 is a schematic diagram of a control device 1 according to the present embodiment. The control device 1 includes a main body 11, a display 12, and a keyboard 13.

  As will be described later, a display control circuit 100 is provided inside the display 12, and the display 12 and the display control circuit 100 are electrically connected. The keyboard 13 is electrically connected to a CPU 92 provided inside the main body 11. The keyboard 13 includes numeric keys 0 to 9, alphabet keys A to Z, cursor keys, space keys, and a plurality of function keys. The alphabet keys also have a function of inputting kana characters by inputting Roman characters. The space key basically has a function of inputting a blank character, but also has a function of executing kanji conversion of the input kana character. The cursor key is used to move the cursor displayed on the display 12.

  FIG. 2 is a schematic cross-sectional view of the coal combustion device 2 controlled by the control device 1. The coal combustion device 2 and the control device 1 are connected to each other via a network.

  The coal combustion apparatus 2 includes a coal combustion boiler 20, a coal addition unit 30 that adds coal to the coal combustion boiler 20, and nitrogen oxides from exhaust gas and coal ash generated by burning coal in the coal combustion boiler 20. A denitration device 40 to be removed, an electric dust collector 50 that separates exhaust gas and coal ash that have passed through the denitration device 40, an exhaust gas discharge unit 60 that discharges the exhaust gas separated by the electric dust collector 50, and electrostatic dust collection And a coal ash discharge part 70 for discharging the coal ash separated by the vessel 50.

  Here, when coal is burned in the coal-fired boiler 20, coal ash is generated. This coal ash is mixed with exhaust gas as floating particles and fly ash moving from the coal-fired boiler 20 to the denitration device 40, and a plurality of particles are mutually connected. By agglomerating, it can be roughly classified into clinker ash that drops and accumulates at the bottom of the coal-fired boiler 20. Below, coal ash is divided and explained to fly ash and clinker ash.

  Inside the coal combustion boiler 20, a steam transport pipe 21 for transporting steam heated by the coal combustion boiler 20 is provided. The steam transport pipe 21 is connected to a turbine 22 for operating a generator (not shown).

  Further, a clinker ash collection silo 23 for collecting clinker ash is provided at the bottom of the coal combustion boiler 20. This clinker ash collection | recovery silo 23 is a water tank of the shape expanded toward upper direction from the downward direction.

  The coal addition unit 30 is added from a coal addition device 31 that adds coal, an elution inhibitor addition device 32 that adds an elution inhibitor, and coal added from the coal addition device 31 and an elution inhibitor addition device 32. A mixing device 33 that mixes the elution inhibitor and a mill 34 that pulverizes the coal supplied from the mixing device 33 and adds the pulverized coal to the coal combustion boiler 20 are included.

  Below the coal adding device 31, a coal flow rate adjusting valve 35 for adjusting the flow rate of coal to be fed into the mixing device 33 is provided, and below the elution inhibitor adding device 32, elution to be added to the mixing device 33. An elution inhibitor flow rate adjusting valve 36 for adjusting the flow rate of the inhibitor is provided. In addition, the mixing device 33 has an input port for supplying coal from the coal addition device 31, and a sensor 37 that detects that coal is input from the coal addition device 31 is provided in the vicinity of the input port. ing. The sensor 37 includes an emission unit 38 that emits light such as visible light and infrared light, and a detection unit 39 that detects the emitted light. The detection unit 39 detects whether or not coal is supplied from the coal addition device 31 to the mixing device 33 by detecting light from the injection unit 38.

  Examples of the elution inhibitor stored in the elution inhibitor adding device 32 include calcium compounds such as limestone, calcium oxide, and slaked lime, and iron hydroxide.

  Here, the coal thrown into the coal addition apparatus 31 is thrown in from the coal warehouse 3 mentioned later via a conveyor. In the present embodiment, the coal warehouse 3 is also a component of the coal combustion device 2 in a broad sense.

  Between the denitration device 40 and the electrostatic precipitator 50, the combustion air supplied to the coal combustion boiler 20 is heated by the heat of the exhaust gas that has passed through the denitration device 40, and the combustion air is supplied to the air heater. A pushing ventilator 42 to be supplied is provided. In addition, a heat recovery unit 43 that recovers the heat of the exhaust gas that has passed through the denitration device 40 is provided between the denitration device 40 and the electrostatic precipitator 50.

  The exhaust gas discharge unit 60 includes a desulfurization device 61 that removes sulfur oxide in the exhaust gas, a neutralizer addition device 62 that adds a neutralizing agent to the desulfurization device 61 in order to react with the sulfur oxide, and a desulfurization device 61. And a chimney 63 for discharging the exhaust gas that has passed into the atmosphere. Below the neutralizer addition device 62, a neutralizer flow rate adjustment valve 64 for adjusting the flow rate of the neutralizer added to the desulfurization device 61 is provided. A reheater 65 is provided between the desulfurization device 61 and the chimney 63 to superheat the exhaust gas that has passed through the desulfurization device 61 with the heat recovered by the heat recovery device 43.

  The sulfate produced as a by-product by the desulfurization device 61 is transported to the sulfate concentration device 66 through the sulfate transport pipe provided below the desulfurization device 61. In the sulfate concentrating device 66, concentrated sulfate is produced by concentrating the transported sulfate. The produced concentrated sulfate is transported to a sulfate warehouse (not shown) through a concentrated sulfate transport pipe 67 provided below the sulfate concentrator 66.

  Examples of the neutralizing agent include calcium compounds such as limestone (calcium carbonate), calcium oxide and slaked lime (calcium hydroxide), and magnesium compounds such as magnesium oxide and magnesium hydroxide. These calcium compounds and magnesium compounds may be powders or slurries.

  Moreover, as a neutralizing agent, sodium hydroxide (caustic soda), the aqueous solution of sodium carbonate (sodium carbonate), ammonia, etc. are mentioned.

  Sulfate as a by-product is calcium sulfate (gypsum) that can be used as a building material when a calcium compound is used as a neutralizing agent, and when a magnesium compound or ammonia is used as a neutralizing agent. Is magnesium sulfate that can be used as a fertilizer. Therefore, the exhaust gas can be effectively used by using these neutralizing agents. In particular, when limestone is used as a neutralizing agent, limestone can be desulfurized at low cost because limestone is less expensive than other materials suitable for the neutralizing agent.

  The coal ash discharge unit 70 kneads the fly ash recovery silo 72 that stores the fly ash and the elution inhibitor separated by the electric dust collector 50, the fly ash, the elution inhibitor, and water, and is insoluble in water. And a kneader 73 for generating a compound.

  As the kneading machine 73, for example, a known kneading machine such as an extrusion granulator or a rolling granulator can be used. The fly ash and elution inhibitor kneaded by the kneader 73 are supplied from the fly ash recovery silo 72, and the water kneaded by the kneader 73 is supplied from a water tank (not shown) through the water transport pipe 75. It is. Since the fly ash kneaded by the kneading machine 73 contains an elution inhibitor, an insoluble compound is produced by kneading the fly ash, the elution inhibitor and water with the kneader 73, and this insoluble compound. Is discharged to the outside through a discharge pipe 76 provided below the kneader 73.

  FIG. 3 is a schematic view of the coal warehouse 3 that stores the coal to be input to the coal adding device 31 described above. The coal warehouse 3 is a component of the coal combustion device 2 in a broad sense, and the coal warehouse 3 and the control device 1 are connected to each other via a network.

  The coal warehouse 3 includes a plurality of coal silos, and includes at least a first coal silo 81A and a second coal silo 81B. For simplicity, the present embodiment will be described with respect to two coal silos, but the present invention is not limited to this, and there may be three or more coal silos.

  Above the first coal silo 81A and the second coal silo 81B, a coal receiving conveyor 82 for receiving coal from a ship, a truck, or the like is provided. On the coal receiving conveyor 82, coal received from a ship, a truck, or the like A coal receiving flow rate measuring device 83 is provided for measuring the flow rate. A first switching damper 84A for receiving coal into the first coal silo 81A is provided above the first coal silo 81A. Above the second coal silo 81B, the coal is fed to the second coal silo 81B. A second switching damper 84B for receiving is provided. When the first switching damper 84A is opened, the coal is received by the first coal silo 81A. On the other hand, when the first switching damper 84A is closed and the second switching damper 84B is opened, the coal is received by the second coal silo 81B.

  In addition, a first storage amount measuring device 85A for measuring the amount of coal stored in the first coal silo 81A is provided above the first coal silo 81A, and above the second coal silo 81B. A second storage amount measuring device 85B for measuring the amount of coal stored in the second coal silo 81B is provided.

  Below the first coal silo 81 </ b> A and the second coal silo 81 </ b> B, a coal delivery conveyor 86 for feeding coal into the coal addition device 31 is provided. Further, a first coal discharge valve 87A for discharging coal from the first coal silo 81A to the coal discharge conveyor 86 is provided between the first coal silo 81A and the coal discharge conveyor 86, and the second coal silo 81B. And a coal discharge conveyor 86, a second coal discharge valve 87B for discharging coal from the second coal silo 81B to the coal discharge conveyor 86 is provided.

  On the coal delivery conveyor 86, between the 1st coal discharge valve 87A and the 2nd coal discharge valve 87B, the 1st for measuring the flow volume of the coal discharged | emitted from the 1st coal silo 81A to the coal delivery conveyor 86. A coal discharge flow rate measuring device 88A is provided. Moreover, it is on the coal delivery conveyor 86, and between the 2nd coal discharge valve 87B and the coal addition apparatus 31, it is the 2nd for measuring the flow volume of the coal discharged | emitted from the 2nd coal silo 81B to the coal delivery conveyor 86. A coal discharge flow rate measuring device 88B is provided. In the present embodiment, the flow rate of coal discharged from the first coal silo 81A to the coal delivery conveyor 86 is obtained from the measured value of the first coal discharge flow rate measuring device 88A. On the other hand, the flow rate of coal discharged from the second coal silo 81B to the coal delivery conveyor 86 is obtained by subtracting the measured value of the first coal discharge flow rate measuring device 88A from the measured value of the second coal discharge flow rate measuring device 88B. Desired.

  FIG. 4 shows a circuit configuration including a main control circuit 90 provided in the main body 11 and a peripheral device (actuator) electrically connected to the main control circuit 90.

  The main control circuit 90 includes a microcomputer 91 disposed on a circuit board as a main component. The microcomputer 91 includes a CPU 92 that performs a control operation in accordance with a preset program (FIGS. 9 to 11 described later), and a ROM 93 and a RAM 94 that are storage means (storage means).

  The CPU 92 is connected to a clock pulse generation circuit 95 that generates a reference clock pulse, a frequency divider 96, and a timer IC 97. In the present embodiment, the timer IC 97 is used as a time measuring means, and measures the time when it is determined that the type of coal to be input to the coal combustion boiler 20 has been changed. That is, the time elapsed is counted as “0” when it is determined that the type of coal to be input to the coal combustion boiler 20 has been changed.

  The ROM 93 stores the above-described program, various control commands (commands) for transmission to the actuator, and the like. The RAM 94 stores various data (information) and is provided with various storage areas. The RAM 94 includes, for example, ash data corresponding to ash contained in coal burned in the coal combustion boiler 20, concentration data corresponding to the concentration of a predetermined metal element, and consumption corresponding to the consumption of coal consumed in the coal combustion boiler. Data such as quantity data is stored. The predetermined metal element is calcium when the elution inhibitor is a calcium compound, and iron when the elution inhibitor is iron hydroxide.

  In the circuit of FIG. 4, the main actuators whose operation is controlled by a control signal from the microcomputer 91 include a coal flow rate adjustment valve 35, an elution inhibitor flow rate adjustment valve 36, a first coal discharge valve 87 </ b> A, There are two coal discharge valves 87B and a display 12.

  Further, a coal flow rate adjustment valve drive circuit 98 for driving and controlling the coal flow rate adjustment valve 35 is provided inside the coal flow rate adjustment valve 35, and the elution inhibitor flow rate control valve 36 is provided with this elution inhibitor flow rate. An elution inhibitor flow rate adjusting valve driving circuit 99 for driving and controlling the adjusting valve 36 is provided. The first coal discharge valve drive circuit 100A is provided inside the first coal discharge valve 87A, and the second coal discharge valve drive circuit 100B is provided inside the second coal discharge valve 87B. Each of these drive circuits is connected to the output unit of the CPU 92 via a network, and receives a control signal such as a drive command output from the CPU 92 to control the operation of each actuator.

  A display control circuit 100 that controls image display on the display 12 is provided inside the main body 11 and is connected to an output unit of the CPU 92. The display control circuit 100 controls the image display on the display 12 in response to a control signal such as an image display command output from the CPU 92.

  The main input signal generating means for generating an input signal necessary for the microcomputer 91 to generate a control command includes a detection unit switch 39S, a keyboard switch 13S, a first storage amount measuring circuit 102A, 2 storage amount measurement circuit 102B and demand power detection circuit 110.

  The detection unit switch 39S is provided inside the detection unit 39, generates a detection signal when detecting light emitted from the emission unit 38, and supplies the detection signal to the CPU 92. The keyboard switch 13 </ b> S is provided inside the keyboard 13, generates an input signal such as a corresponding character according to an operation of the keyboard 13, and supplies the input signal to the CPU 92. The first storage amount measuring circuit 102A is provided inside the first storage amount measuring device 85A, generates an input signal corresponding to the storage amount of coal stored in the first coal silo 81A, and supplies the input signal to the CPU 92. The second storage amount measuring circuit 102B is provided inside the second storage amount measuring device 85B, generates an input signal corresponding to the storage amount of coal stored in the second coal silo 81B, and supplies it to the CPU 92.

  The demand power detection circuit 110 is provided inside the demand power detection server 4 and includes a demand power detection microcomputer 111, a program ROM 112, and a work RAM 113. The demand power detection server 4 is connected to the control device 1 via a network.

  The demand power detection microcomputer 111 includes a CPU. The CPU included in the demand power detection microcomputer 111 calculates the demand power based on the control program stored in the program ROM 112 based on the power request signal transmitted by the consumer performing the power request operation. Data corresponding to the calculation result is transmitted to the CPU 92.

  The program ROM 112 stores a control program executed by the demand power detection microcomputer 111 and the like. The work RAM 113 is configured as a temporary storage unit for work when the demand power detection microcomputer 111 executes the control program described above.

  With reference to FIG. 5, the power demand zone determination table used for determining whether or not the load applied to the generator is fluctuating is determined.

  FIG. 5 is a demand power zone determination table. The demand power zone determination table includes demand power zone data (information) corresponding to demand power. When the calculation result of the demand power performed by the CPU provided in the demand power detection microcomputer 111 is less than 120 MW, the demand power zone is zone 1, and when the demand power zone is 120 MW or more, the demand power zone is zone 2. It is.

  The CPU provided in the demand power detection microcomputer 111 transmits data indicating whether the demand power zone is zone 1 or zone 2 to the CPU 92. The CPU 92 compares the demand power zone data stored in the RAM 94 with the transmitted data. Thereby, when each data is different, it can be determined that the load applied to the generator is fluctuating, and when each data is the same, the load applied to the generator is not fluctuated. Can be determined.

  FIG. 6 is a coal consumption determination table. This coal consumption determination table is used on the condition that the CPU 92 determines that the load on the generator is fluctuating. In the present embodiment, the flow rate of coal input from the coal adding device 31 to the coal combustion boiler 20 via the mill 34 is defined as the consumption of coal. It is not limited.

  The coal consumption determination table includes coal consumption data (information) corresponding to the demand power zone. When the demand power zone is Zone 1, the coal consumption (flow rate) is 200 t / h, and when the demand power zone is Zone 2, the coal consumption (flow rate) is 300 t / h. is there.

  Here, when the demand power zone is zone 1, the CPU 92 drives the coal flow rate adjusting valve to drive the consumption data to supply the coal from the coal adding device 31 to the mill 34 at a consumption (flow rate) of 200 t / h. Transmit to circuit 98. Receiving this consumption data, the coal flow control valve 35 is driven to a position where coal is supplied at a consumption (flow rate) of 200 t / h. When the demand power zone is zone 2, the CPU 92 uses the coal flow control valve drive circuit 98 to supply consumption data for supplying coal from the coal addition device 31 to the mill 34 at a consumption (flow rate) of 300 t / h. Send to. Receiving this consumption data, the coal flow control valve 35 is driven to a position where coal is supplied at a consumption (flow rate) of 300 t / h.

  Next, operation | movement of the coal combustion apparatus 2 controlled by the control apparatus 1 is demonstrated, referring FIG. Hereinafter, the case where the neutralizing agent and the dissolution inhibitor are limestone will be described, but the present invention is not limited to this.

  First, the display 12 receives the control signal from the CPU 92 described above, and displays the ash content (%) and the concentration (%) of calcium (predetermined metal element) contained in the coal to be fed into the coal addition device 31 with the keyboard 13. An image that prompts the administrator of the control device 1 to perform an operation input from is displayed. The administrator operates the above-described keyboard 13 based on the display on the display 12 to generate an input signal corresponding to the ash (%) and calcium concentration (%) contained in the coal to be input to the coal addition device 31. . At this time, the CPU 92 (FIG. 4) stores the ash content (%) contained in the coal as ash data in the RAM 94 (ash content data storage means) in FIG. 4, and the calcium concentration (%) contained in the coal as the concentration data. The data is stored in the RAM 94 (density data storage means).

  Next, the CPU 92 (concentration calculation means) is included in the coal ash generated when the coal to be input to the coal addition device 31 is burned in the coal combustion boiler 20 based on the ash content data and the concentration data stored in the RAM 94. Calculate the calcium concentration (%).

  When the calculated calcium concentration is equal to or higher than the predetermined concentration, the CPU 92 transmits a signal for closing the elution inhibitor flow rate adjustment valve 36 to the elution inhibitor flow rate adjustment valve drive circuit 99 (FIG. 4). In the present embodiment, the predetermined concentration is 10%, but this predetermined concentration differs depending on the type of the coal combustion boiler 20. When the calculated calcium concentration is equal to or higher than the predetermined concentration, the elution inhibitor is not supplied to the fly ash recovery silo 72. In this case, the kneading machine 73 is insoluble by kneading coal ash and water. Is formed. Therefore, the usage-amount of limestone (elution inhibitor) can be suppressed by aiming at the effective utilization of calcium contained in coal ash.

  On the other hand, when the calcium concentration is not equal to or higher than the predetermined concentration, the CPU provided in the demand power detection microcomputer 111 calculates the demand power by the consumer and stores it in the above demand power zone determination table stored in the work RAM 113 in advance. Based on this, the demand power zone is determined. The CPU provided in the demand power detection microcomputer 111 transmits data of the determined demand power zone to the CPU 92.

  Next, the CPU 92 (load fluctuation determining means) determines whether or not the load applied to the generator is fluctuating based on the demand power zone data received from the CPU provided in the demand power detection microcomputer 111. The demand power zone data is determined by the CPU provided in the demand power detection microcomputer 111 based on the demand power zone determination table. Then, the CPU 92 determines the consumption (flow rate) of coal based on the coal consumption determination table on the condition that the load applied to the generator is fluctuating, and the consumption corresponding to the determined consumption. The quantity data is transmitted to the coal flow control valve driving circuit 98.

  Thus, by providing the demand power zone determination table and the coal consumption determination table, the amount of the elution inhibitor added to the fly ash recovery silo 72 from the elution inhibitor addition device 32 is switched according to the load on the generator. be able to. Therefore, when the load on the generator is increased, heavy metals can be prevented from leaching out of coal ash due to the lack of elution inhibitors, and when the load is reduced, excessive amounts of elution are prevented. Corrosion of the coal combustion device due to the addition of the agent can be suppressed. Therefore, the burden on the manager can be reduced, and the use cost of the coal combustion device 2 can be suppressed.

  The coal adding device 31 adds the coal carried from the coal warehouse 3 to the mixing device 33, and the elution inhibitor adding device 32 adds limestone to the mixing device 33. The amount of limestone added from the elution inhibitor addition device 32 to the mixing device 33 is determined by opening and closing the elution inhibitor flow rate adjustment valve 36.

Here, the opening / closing control of the elution inhibitor flow rate adjusting valve 36 will be described. CPU92 (addition amount calculation means) calculates the addition amount of the limestone added to the fly ash collection | recovery silo 72 from the elution inhibitor addition apparatus 32 based on ash content data, density | concentration data, and consumption data. Specifically, the numerical value corresponding to the ash content data is ash, the numerical value corresponding to the concentration data is the calcium concentration in the coal, and the numerical value corresponding to the consumption data is the coal amount. ] Is calculated. In the present embodiment, the addition amount is determined by the flow rate (t / h), but is not limited thereto.

  The CPU 92 determines whether or not a detection signal is received from the detection unit switch 39S. If the detection signal is received, the CPU 92 transmits the calculated limestone addition amount data to the elution inhibitor flow rate adjustment valve drive circuit 99. .

  As described above, the coal combustion device 2 includes the elution inhibitor addition device 32 that adds limestone (elution inhibitor) to the coal addition device 31, and the CPU 92 (addition amount calculation means) includes ash content data, concentration data, and The amount of limestone added is calculated based on the consumption data. Thereby, since the quantity of the limestone added to the coal addition apparatus 31 from the elution inhibitor addition apparatus 32 can be suppressed to a necessary minimum, while being able to reduce possibility that a heavy metal will elute outside from a fly ash, it is excessive It is possible to suppress the occurrence of heat transfer inhibition or the like due to boiler slacking by adding an appropriate amount of the dissolution inhibitor. Therefore, it is not necessary to purchase unnecessary additives or perform unnecessary corrosion countermeasures, so that the burden on the administrator can be reduced and the use cost of the coal combustion device 2 can be suppressed.

  Further, only when the sensor 37 is provided and the detection signal is received from the detection unit switch 39S, the amount of limestone added is obtained by transmitting the calculated limestone flow rate information to the elution inhibitor flow rate adjusting valve drive circuit 99. Is calculated, limestone is added from the elution inhibitor addition device 32 to the mixing device 33 until the sensor 37 detects that the coal is added from the coal addition device 31 to the mixing device 33. There is no. Therefore, the amount of the elution inhibitor added from the elution inhibitor addition device 32 to the mixing device 33 can be regulated more strictly.

  In the mill 34, the coal input from the mixing device 33 is pulverized to be easily burned by the coal combustion boiler 20 and added to the coal combustion boiler 20. In the coal combustion boiler 20, the added coal is burned, and the water inside the steam transport pipe 21 is heated. The water in the steam transport pipe 21 changes its state to steam by being heated, and is transported from the coal combustion boiler 20 to the upper side of the turbine 22 through the steam transport pipe 21 and used for the turbine 22. A generator (not shown) can be operated.

  Further, when coal is burned, exhaust gas and coal ash are generated. As described above, the coal ash is roughly classified into fly ash and clinker ash. The exhaust gas and fly ash move to the denitration apparatus 40, and the clinker ash is deposited on the clinker ash recovery silo 23 containing water.

  In the denitration apparatus 40, nitrogen compounds contained in the exhaust gas and fly ash are removed, and the exhaust gas and fly ash are transferred to the electric dust collector 50. At this time, the exhaust gas and fly ash pass through the air heater 41 and the heat recovery machine 43. In the air heater 41, the combustion air supplied from the forced air blower 42 to the coal combustion boiler 20 is heated by the heat of the exhaust gas and fly ash. The heat recovery machine 43 recovers heat contained in the exhaust gas and fly ash. The recovered heat is used in the reheater 65.

  In the electric dust collector 50, the exhaust gas and fly ash are separated, the separated exhaust gas is transferred to the desulfurization device 61, and the fly ash is transferred to the fly ash collection silo 72. In the desulfurization apparatus 61, the limestone added from the neutralizer addition apparatus 62 and sulfur oxide in the exhaust gas are reacted to separate into exhaust gas and calcium sulfate, and the separated exhaust gas is transferred to the chimney 63 and separated sulfuric acid. Transfer calcium to sulfate concentrator 66. Thereby, the sulfur oxide in exhaust gas can be removed. The flow rate of limestone added from the neutralizer addition device 62 to the desulfurization device 61 is determined by opening and closing of the neutralizer flow rate adjustment valve 64, and opening and closing of the neutralizer flow rate adjustment valve 64 is not shown. Controlled by a flow control valve drive circuit.

  The exhaust gas passes through the reheater 65 when moving from the desulfurization device 61 to the chimney 63. At this time, the exhaust gas is heated by the heat recovered by the heat recovery machine 43. Thereby, exhaust gas can be efficiently discharged from the chimney 63. In the sulfate concentrator 66, the calcium sulfate transported from the desulfurizer 61 is concentrated to produce gypsum and transported to a sulfate warehouse (not shown) through the concentrated sulfate transport pipe 67.

  The fly ash recovery silo 72 stores limestone added from the elution inhibitor adding device 32 and fly ash separated by the electric dust collector 50. In the kneader 73, an elution inhibitor (here, the elution inhibitor is limestone, but is not limited thereto), fly ash, and water are kneaded to produce a compound insoluble in water. The elution inhibitor and fly ash are supplied from a fly ash collection silo 72, and water is supplied through a water transport pipe 75 from a water tank (not shown). The insoluble compound produced by the kneader 73 is discharged to the outside through the discharge pipe 76.

  Next, operation | movement of the coal warehouse 3 controlled by the control apparatus 1 is demonstrated, referring FIG.

  First, coal received from a ship or a truck is conveyed to the first switching damper 84A through the coal receiving conveyor 82. Whether the coal to be transported is input to the first coal silo 81A or the second coal silo 81B is selected by an operation of the keyboard 13 (described above) by the administrator. Specifically, when the CPU 92 (described above) receives a command signal to input the first coal silo 81A by operating the keyboard 13, the CPU 92 opens the first switching damper 84A and the second switching damper 84B. Is transmitted to a first switching damper driving circuit (not shown) and a second switching damper driving circuit (not shown). The first switching damper driving circuit and the second switching damper driving circuit drive the first switching damper 84A and the second switching damper 84B based on the command signal received from the CPU 92. On the other hand, when the CPU 92 (described above) receives a command signal for input to the second coal silo 81B by operating the keyboard 13, the CPU 92 closes the first switching damper 84A and switches the second switching damper 84B. A command signal for opening is transmitted to the first switching damper driving circuit and the second switching damper driving circuit. The first switching damper driving circuit and the second switching damper driving circuit drive the first switching damper 84A and the second switching damper 84B based on the command signal received from the CPU 92. FIG. 8 shows a state in which the first switching damper 84A is opened and the second switching damper 84B is closed. In this case, the coal is input to the first coal silo 81A and is not input to the second coal silo 81B.

  Whether the coal to be charged into the above-described coal combustion boiler 20 is input from the first coal silo 81A into the coal combustion boiler 20 or the second coal silo 81B into the coal combustion boiler 20 is also determined by the keyboard 13 ( Selected by the above operation. Specifically, when the above-described CPU 92 (selection signal receiving means) receives a selection signal for selecting the first coal silo 81A as a coal silo to input coal into the coal combustion boiler 20 by an input operation of the keyboard 13 by the administrator. The CPU 92 sends a command signal for opening the first coal discharge valve 87A and closing the second coal discharge valve 87B to the first coal discharge valve drive circuit 100A (described above) and the second coal discharge valve drive circuit 100B (described above). ). Further, in this case, the CPU 92 stores the data of the coal silo indicating that the coal silo that inputs the coal into the coal combustion boiler 20 is the first coal silo 81A in the RAM 94 (coal silo data storage means). The first coal discharge valve drive circuit 100A and the second coal discharge valve drive circuit 100B drive the first coal discharge valve 87A and the second coal discharge valve 87B based on a command signal received from the CPU 92. On the other hand, when the above-mentioned CPU 92 (selection signal receiving means) receives a selection signal for selecting the second coal silo 81B as a coal silo to input coal into the coal combustion boiler 20 by an input operation of the keyboard 13 by the administrator. The CPU 92 transmits a command signal for closing the first coal discharge valve 87A and opening the second coal discharge valve 87B to the first coal discharge valve drive circuit 100A and the second coal discharge valve drive circuit 100B. Further, in this case, the CPU 92 stores the data of the coal silo indicating that the coal silo that inputs the coal into the coal combustion boiler 20 is the second coal silo 81B in the RAM 94 (coal silo data storage means). The first coal discharge valve drive circuit 100A and the second coal discharge valve drive circuit 100B drive the first coal discharge valve 87A and the second coal discharge valve 87B based on a command signal received from the CPU 92. FIG. 8 shows a state where the second coal discharge valve 87B is opened and the first coal discharge valve 87A is closed. In this case, coal is input from the second coal silo 81B and is not input from the first coal silo 81A.

  It is also possible to send a command signal for putting 70% coal from the first coal silo 81A by operating the keyboard 13 and putting 30% coal from the first coal silo 81A. In this case, the CPU 92 outputs a command signal for opening the first coal discharge valve 87A by 70% of the fully open state and opening the second coal discharge valve 87B by 30% of the fully open state of the first coal discharge valve driving circuit 100A (described above). ) And the second coal discharge valve drive circuit 100B (described above).

  The first storage amount measuring device 85A measures the amount of coal stored in the first coal silo 81A. The amount measured here is transmitted from the first storage amount measurement circuit 102A to the CPU 92 as first storage amount data. Similarly, the second storage amount measuring device 85B measures the amount of coal stored in the second coal silo 81B. The amount measured here is transmitted from the second storage amount measurement circuit 102B to the CPU 92 as second storage amount data.

  Here, the coal type change which changes the kind of coal thrown into the coal combustion boiler 20 is demonstrated. When the CPU 92 receives a selection signal for selecting the first coal silo 81A or a selection signal for selecting the second coal silo 81B as a coal silo for charging coal into the coal combustion boiler 20 by an input operation of the keyboard 13 by the administrator, It is determined whether or not the coal type has been changed. Specifically, the CPU 92 as the comparison means, on the condition that the coal silo data is stored in the RAM 94 (coal silo data storage means), the coal silo data corresponding to the received selection signal, and the RAM 94 ( The data of the coal silo stored in the coal silo data storage means) is compared. Then, the CPU 92 as the coal type change determining means determines that the coal type has been changed when the respective data is different, and if the respective data are the same, the coal type is changed. It is determined that it is not.

  Further, the CPU 92 receives information indicating that the amount of coal stored in the first coal silo 81A is “0” from the first storage amount measurement circuit 102A, or the second storage amount measurement circuit 102B receives the second coal. Even when information indicating that the amount of coal stored in the silo 81B is “0” is determined, it is determined that the coal type has been changed.

  When it is determined that the coal type has been changed, the time set in the above-described timer IC 97 is updated to zero, and the timer IC 97 (time measuring means) indicates that the coal type has been changed. The time is counted until a predetermined time is reached based on the determined time. The purpose of timing is the ash content data before the coal type change until the fly ash by the coal after the coal type change reaches the fly ash recovery silo 72 even after the coal type change is performed. This is because limestone should be added based on the concentration data. The predetermined time is the time until the fly ash by coal after the change of the coal type reaches the fly ash recovery silo 72, but this predetermined time may be set in advance, You may determine based on the flow velocity in the coal combustion apparatus 2, the capacity | capacitance of the coal combustion apparatus 2, etc. Then, when a predetermined time is counted by the timer IC 97, an image that prompts the administrator of the control device 1 to input the ash content (%) and the concentration (%) of calcium (predetermined metal element) from the keyboard 13 Is displayed again. When the administrator generates an input signal, the CPU 92 (ash data switching means) switches the ash data stored in the RAM 94 (ash data storage means) to ash data corresponding to the input signal. The CPU 92 (density data switching means) switches density data stored in the RAM 94 (density data storage means) to density data corresponding to the input signal.

  As described above, when it is determined that the coal type is changed, the ash content data and the concentration data can be switched, so that the type of coal to be input to the coal combustion boiler 20 is changed. The amount of the elution inhibitor to be added from the elution inhibitor addition device 32 to the mixing device 33 can be switched. Thereby, when the density | concentration of the calcium contained in the coal after a change is low compared with the density | concentration before a change, it can suppress that a heavy metal elutes from coal ash by the lack of limestone. On the other hand, when the concentration of calcium contained in the coal after the change is higher than the concentration before the change, corrosion of the coal combustion apparatus due to the addition of an excessive amount of limestone can be suppressed. Therefore, the burden on the manager can be reduced and the use cost of the coal combustion apparatus can be suppressed.

  Further, even if it is determined that the coal type is changed by using the timer IC 97, the ash content data and the concentration data are switched by the CPU 92 until the timer IC 97 counts a predetermined time. It will never be done. Thus, until it is determined that the coal type has been changed and the fly ash generated after combustion of the changed coal is actually stored in the fly ash recovery silo 72, the ash content data before the change and Limestone can be added based on the concentration data. Therefore, the amount of limestone added to the coal ash recovery silo from the elution inhibitor adding device can be more strictly defined.

  The control operation of the main control circuit 90 will be described with reference to the main flowcharts shown in FIGS. Here, although the case where the elution inhibitor is limestone will be described, the present invention is not limited to this, and may be calcium oxide, slaked lime, iron hydroxide, or the like as described above.

  First, the CPU 92 performs initialization (step S1), and proceeds to step S2. Specifically, initialization of the storage contents of the RAM 94, initialization of communication data, and the like are performed. In step S2, the predetermined stored contents of the RAM 94 are erased (cleared), and the process proceeds to step S3. Specifically, the data (for example, ash content data, density data) in the writable area of the RAM 94 used in the previous process is deleted.

  In step S <b> 3, the CPU 92 displays a signal for displaying on the display 12 an image prompting the administrator to input the ash (%) and calcium concentration (%) contained in the coal to be input to the coal adding device 31 from the keyboard 13. Is transmitted to the display control circuit 100, and the process proceeds to step S4. In step S4, it is determined whether or not an input signal corresponding to ash (%) and calcium concentration (%) contained in the coal is received from the keyboard switch 13S. If this determination is YES, the process proceeds to step S5, and if NO, the process proceeds to step S4. In step S5, the input signal corresponding to the ash contained in the coal is stored as ash data in the RAM 94, the input signal corresponding to the calcium concentration contained in the coal is stored in the RAM 94 as the concentration data, and the process proceeds to step S6.

  In step S6, the concentration of calcium (predetermined metal element) contained in the clinker ash is calculated based on the ash content data and concentration data stored in the RAM 94, and the process proceeds to step S7. In step S7, it is determined whether or not the calculated calcium concentration is equal to or higher than a predetermined concentration (for example, 10%). When this determination is YES, the process proceeds to step S8, and when NO, the process proceeds to step S9 in FIG. In step S8, a signal for closing the elution inhibitor flow rate adjustment valve 36 is transmitted to the elution inhibitor flow rate adjustment valve drive circuit 99, and the process proceeds to step S22 in FIG.

  In step S9 of FIG. 10, a signal for requesting data of the demand power zone is transmitted to the demand power detection microcomputer 111, and the process proceeds to step S10. Thereby, the CPU provided in the demand power detection microcomputer 111 calculates the demand power by the consumer, and determines the demand power zone based on the above-described demand power zone determination table stored in the work RAM 113 in advance.

  In step S <b> 10, it is determined whether or not demand power zone data is received from a CPU provided in the demand power detection microcomputer 111. When this determination is YES, the process proceeds to step S11, and when NO, the process proceeds to step S10. In step S <b> 11, it is determined whether or not the demand power zone data is stored in the RAM 94. When this determination is YES, the process proceeds to step S12, and when NO, the process proceeds to step S13.

  In step S12, it is determined whether or not the load applied to the generator is fluctuating. When this determination is YES, the process proceeds to step S13, and when NO, the process proceeds to step S17 in FIG. Whether or not the load on the generator is fluctuating is determined by comparing the demand power zone data stored in the RAM 94 with the data transmitted from the CPU provided in the demand power detection microcomputer 111. . Specifically, when these data are different from each other, it is determined that the load is fluctuating, and when the data is the same, it is determined that the load is not fluctuating.

  In step S13, the demand power zone data transmitted from the CPU provided in the demand power detection microcomputer 111 is stored in the RAM 94, and the process proceeds to step S14. In step S14, the coal consumption is determined based on the demand power zone data stored in the RAM 94 and the coal consumption determination table (described above) similarly stored in the RAM 94, and the process proceeds to step S15. In step S15, the determined coal consumption is stored in the RAM 94 as consumption data, and the process proceeds to step S16. In step S16, the consumption data stored in the RAM 94 is transmitted to the coal flow control valve drive circuit 98, and the process proceeds to step S17 in FIG.

  In step S17 of FIG. 11, addition of limestone added to the mixing device 33 from the elution inhibitor adding device 32 based on the ash content data, concentration data, and consumption data among the data stored in the RAM 94. The amount is calculated, and the process proceeds to step S18. In this step S17, the above-described [Equation 1] and [Equation 2] are calculated. In step S18, the calculated addition amount of limestone is stored in RAM 94 as addition amount data, and the process proceeds to step S19.

  In step S19, it is determined whether or not the time measured by the timer IC 97 has reached a predetermined time. The time measured by the timer IC 97 is the time that has elapsed since the time was set to “0” in the process of step S27. Moreover, although predetermined time is based on the time until the coal after a coal type change reaches | attains the mixing apparatus 33, you may set to fixed time beforehand, consumption of coal, and the coal addition apparatus 31 You may determine based on a capacity | capacitance, the flow velocity in the coal combustion apparatus 2, etc. When this determination is YES, the process proceeds to step S20, and when NO, the process proceeds to step S19.

  In step S20, it is determined whether or not a detection signal is received from the detection unit switch 39S. When this determination is YES, the process proceeds to step S21, and when NO, the process proceeds to step S20. In step S21, the addition amount data stored in the RAM 94 is transmitted to the elution inhibitor flow rate adjustment valve drive circuit 99, and the process proceeds to step S22.

  In step S22, it is determined whether or not the amount of stored coal is “0”. Specifically, the storage amount of the coal silo corresponding to the coal silo data stored in the RAM 94 is determined based on the signals transmitted from the first storage amount measurement circuit 102A and the second storage amount measurement circuit 102B. . If this determination is YES, the process proceeds to step S26, and if NO, the process proceeds to step S23.

  In step S23, it is determined whether a selection signal is received from the keyboard switch 13S. When this determination is YES, the process proceeds to step S24, and when this determination is NO, the process proceeds to step S20. In step S24, it is determined whether or not coal silo data is stored in the RAM 94. When this determination is YES, the process proceeds to step S25, and when it is NO, the process proceeds to step S26.

  In step S25, it is determined whether or not the coal type is changed. In the process of step S25, the coal silo data corresponding to the selection signal received from the keyboard switch 13S is compared with the coal silo data stored in the RAM 94. If the data is different, it is determined that the coal type has been changed. If the data is the same, it is determined that the coal type has not been changed. When this determination is YES, the process proceeds to step S26, and when this determination is NO, the process proceeds to step S20.

  In step S26, the coal silo data is stored in the RAM 94, and the process proceeds to step S27. In step S27, the timer IC 97 is set to “0”, and the process proceeds to step S2 in FIG. In the process of step S27, the timer IC 97 starts measuring time at the same time as setting the time to “0”.

  Note that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.

  For example, in the demand power zone determination table, the demand power zone is set in two stages, zone 1 and zone 2, but is not limited to this, and is set in a multi-stage setting of three or more stages according to the demand power. May be. Thereby, since unnecessary coal can be prevented from being input from the coal addition device 31 to the mixing device 33, the power generation cost can be reduced.

  In the present embodiment, it is described that there is only one coal addition device 31, but the present invention is not limited to this, and a plurality of coal addition devices may be provided. Thereby, in the coal consumption determination table, it is possible to provide information on the number of coal adding apparatuses corresponding to the demand power zone. For example, when the number of coal adding devices is four, information can be provided in which the number of coal adding devices corresponding to zone 1 is three and the number of coal adding devices corresponding to zone 2 is two. . By using a plurality of coal addition devices in this way, even if one coal addition device fails, the coal combustion boiler 20 can be moved by the remaining coal addition devices, so that stable power supply can be achieved. Can do. Moreover, maintenance of a coal addition apparatus can be performed even if the coal combustion boiler 20 is working by resting one of the coal addition apparatuses.

  In the present embodiment, it is described that only a single lot of coal is input to one coal silo. However, the present invention is not limited to this, and a plurality of lots of coal are input to one coal silo. It may be. In this case, it is necessary to calculate the amount of coal stored in each lot and store the calculation result in the RAM 94. Further, it is necessary to store in the ROM 93 a program for determining that the coal type is changed on condition that the stock quantity of any lot becomes “0”.

  In the present embodiment, the elution inhibitor adding device 32 is provided above the mixing device 33, but the present invention is not limited to this. In the combustion air, in the combustion device, in the flue downstream of the combustion device, etc. You may provide so that it may add.

  In the present embodiment, the elution prevention of the fly ash introduced into the fly ash collection silo 72 is described. However, the present invention is not limited to this, and the clinker ash introduced into the clinker ash collection silo 23 is also kneaded by the kneader 73. Elution prevention can be performed by providing such an apparatus.

  In this embodiment, although the case where coal is burned with the coal combustion boiler 20 is demonstrated, it is not restricted to this, For example, if it is an apparatus which burns coal like an incinerator, what kind of apparatus will be used? It can also be used. In this case, it should be noted that load fluctuation is not performed according to demand power.

The schematic sectional drawing of the control apparatus 1 which concerns on embodiment of this invention. 1 is a schematic view of a coal combustion device 2. FIG. Schematic of the coal warehouse 3. The block diagram which shows the structure of an electric circuit. The figure which shows a demand power zone determination table. The figure which shows a coal consumption determination table. Schematic which shows operation | movement of the coal combustion apparatus 2 controlled by the control apparatus 1. FIG. Schematic which shows operation | movement of the coal warehouse 3 controlled by the control apparatus 1. FIG. The main flowchart of the main control circuit 90. The flowchart following FIG. The flowchart following FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Coal combustion apparatus 20 Coal combustion boiler 32 Elution inhibitor addition apparatus 37 Sensor 72 Coal ash collection | recovery silo 81A 1st coal silo 81B 2nd coal silo 85A 1st storage amount measuring device 85B 2nd storage amount measuring device 92 CPU
94 RAM
97 Timer IC

Claims (9)

A coal fired boiler,
An elution inhibitor adding device for adding an elution inhibitor comprising a metal salt for preventing heavy metals contained in coal ash generated by burning coal in the coal combustion boiler from leaching to the outside;
A control device for controlling a coal combustion device having
Ash data storage means for storing ash data corresponding to the ash contained in the coal;
Concentration data storage means for storing concentration data corresponding to the concentration of the metal element constituting the metal salt contained in the coal;
Consumption data storage means for storing consumption data corresponding to the consumption of the coal consumed in the coal combustion boiler;
An addition amount calculating means for calculating an addition amount of the elution inhibitor based on the ash data, the concentration data, and the consumption data;
An addition amount control means for controlling the addition of the elution inhibitor calculated by the addition amount calculation means to the coal with respect to the elution inhibitor addition device;
A control device comprising: The control device according to claim 1,
Based on the ash content data and the concentration data, comprising a concentration calculation means for calculating the concentration of the metal element constituting the metal salt contained in the coal ash,
The addition amount calculation means calculates the addition amount of the elution inhibitor on the condition that the concentration of the metal element constituting the metal salt calculated by the concentration calculation means is less than a predetermined concentration. Control device. The control device according to claim 1 or 2,
Load variation determination means for determining whether or not the load applied to the generator connected to the coal combustion boiler is fluctuating;
Consumption data switching means for switching the consumption data stored by the consumption data storage means to another consumption data on condition that the load fluctuation determination means determines that the load is changing;
A control device comprising: In the control device according to any one of claims 1 to 3,
A coal type change discriminating means for discriminating whether or not the type of coal to be charged into the coal combustion boiler has been changed;
Ash content data switching means for switching the ash content data stored by the ash content data storage means to another ash content data on the condition that it is determined that the coal type change determination means has been changed,
Concentration data switching means for switching the concentration data stored by the concentration data storage means to another concentration data on the condition that it is determined that the coal type change determination means has been changed,
A control device comprising: The control device according to claim 4,
The coal combustion device
A plurality of coal silos for storing the coal;
A selection signal receiving means for receiving a selection signal for selecting a coal silo to input coal into the coal combustion boiler by an input operation of an administrator;
Coal silo data storage means for storing coal silo data corresponding to the selection signal among the plurality of coal silos;
When the selection signal is received by the selection signal receiving unit, the coal silo corresponding to the selection signal received from the selection signal receiving unit is provided on the condition that the coal silo data is stored in the coal silo data storage unit. And means for comparing the data of the coal silo stored in the coal silo data storage means,
With
The coal type change discriminating means is a means for comparing the data of the coal silo corresponding to the selection signal received from the selection signal receiving means and the data of the coal silo stored in the coal silo data storage means by the comparing means. It is determined that the type of coal to be input to the coal combustion boiler has been changed on the condition that it is determined that The control device according to claim 5,
Each of the plurality of coal silos has a storage amount measuring device for measuring the amount of stored coal,
The coal type change determining means is measured by the storage amount measuring device to measure that the amount of coal stored in the coal silo corresponding to the coal silo data stored by the coal silo data storage means is zero. On the condition, it is determined that the type of coal to be input to the coal combustion boiler has been changed. The control device according to any one of claims 4 to 6,
Comprising time measuring means for measuring time based on when it is determined that the coal type change determining means has been changed,
The ash content data switching means switches the ash content data to another ash content data on the condition that a predetermined time is counted by the timing means.
The control device characterized in that the density data switching means switches the density data to another density data on condition that a predetermined time is counted by the time measuring means. In the control device according to any one of claims 1 to 7,
It has an inlet for charging the coal, and comprises a mixing device for mixing the coal introduced from the inlet and the dissolution inhibitor added from the dissolution inhibitor adding device,
In the vicinity of the charging port, a sensor is provided for detecting that the coal is charged from the charging port to the mixing device,
It further comprises a detection determination means for determining whether or not the sensor is detecting,
The control apparatus characterized in that the addition amount control means performs control to add the elution inhibitor to the coal on the condition that it is determined that the detection determination means has detected. The control device according to any one of claims 1 to 8,
The coal combustion device
A desulfurization apparatus for removing sulfur compounds contained in exhaust gas generated by burning coal in the coal combustion boiler;
A neutralizer addition device for adding a neutralizer to the desulfurization device;
Have
The elution inhibitor and the neutralizing agent are both limestone, and the metal element constituting the metal salt is calcium.

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