Control device

Abstract

This control device for combustion equipment, which has a combustion furnace for combusting an object to be calcined, is provided with: a first control unit capable of controlling a first adjustment unit for adjusting the gas temperature of exhaust gas in the combustion equipment, and a second adjustment unit for adjusting the gas temperature by a method different from that of the first adjustment unit; the control unit selectively controls one or more of the first adjustment unit and the second adjustment unit according to the state in the combustion equipment. And a second control unit that, after selectively controlling one or more of the first adjustment unit and the second adjustment unit by the first control unit, controls the denitration agent supply unit to supply the denitration agent to the exhaust gas in the combustion equipment.

Description

Technical Field

[0001] The invention relates to a control device.

[0002] This application claims priority based on patent application No. 2022-160076 filed in Japan on October 4, 2022, and the contents are incorporated herein by reference. Background Art

[0003] For example, Patent Document 1 discloses an exhaust gas treatment system, which includes: an injection device that injects ammonia or urea into a combustion furnace; a recirculation catalytic denitration device that uses a portion of the exhaust gas recovered from the boiler as recirculation exhaust gas and performs denitration treatment on the recirculation exhaust gas; and an exhaust gas recirculation fan that injects the recirculation exhaust gas that has been denitrated by the recirculation catalytic denitration device into the combustion furnace. In the exhaust gas treatment system, the injection amount of ammonia injected into the recirculation exhaust gas is controlled in such a way that the NOx concentration of the recirculation exhaust gas from the recirculation catalytic denitration device becomes a predetermined value.

[0004] Furthermore, for example, Patent Document 2 discloses a catalyst-free denitrification method for a coal-fired combustion furnace, in which combustion exhaust gas is extracted from a post-combustion area in a main combustion chamber where post-combustion is performed, urea water is blown into the extracted combustion exhaust gas to generate ammonia-containing combustion exhaust gas, and the ammonia-containing combustion exhaust gas is blown into the downstream side of the combustion exhaust gas flow in a secondary combustion area where secondary combustion is performed.

[0005] Previous technical literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2013-072571

[0008] Patent Document 2: Japanese Patent Application Publication No. 2013-108668 Summary of the invention

[0009] Technical issues to be solved by the invention

[0010] However, in the combustion furnace of the incineration equipment for treating garbage, if the gas temperature of the exhaust gas generated by the combustion of the calcined material increases, the denitrification rate of the exhaust gas may decrease. Therefore, water is sometimes sprayed into the combustion furnace to reduce the gas temperature, but the result of spraying water deteriorates the combustion state of the calcined material in the combustion furnace, and the exhaust gas temperature of the combustion equipment may become unstable.

[0011] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a control device capable of stabilizing the exhaust gas temperature of a combustion device.

[0012] Means for solving technical problems

[0013] In order to solve the above-mentioned problems, the control device involved in the present invention is a control device for a combustion equipment having a combustion furnace that burns a calcined object, and comprises: a first control unit, which can control a first adjustment unit that adjusts the gas temperature of the exhaust gas in the combustion equipment, and a second adjustment unit that adjusts the gas temperature in a method different from that of the first adjustment unit, and selectively controls one or more of the first adjustment unit and the second adjustment unit according to the state in the combustion equipment; and a second control unit, which controls a denitrification agent supply unit to supply a denitrification agent to the exhaust gas in the combustion equipment after selectively controlling one or more of the first adjustment unit and the second adjustment unit through the first control unit.

[0014] Effects of the Invention

[0015] According to the present invention, it is possible to provide a control device capable of stabilizing the exhaust gas temperature of a combustion plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a figure which shows the structure of the combustion equipment which concerns on embodiment of this invention.

[0017] Figure 2 This is a functional block diagram of the control device according to the first embodiment of the present invention.

[0018] Figure 3 This is a flowchart showing the operation of the control device according to the first embodiment of the present invention.

[0019] Figure 4 This is a flowchart showing the operation of the control device according to the first embodiment of the present invention.

[0020] Figure 5 This is a flowchart showing the operation of the control device according to the first embodiment of the present invention.

[0021] Figure 6 This is a flowchart showing the operation of the control device according to the second embodiment of the present invention.

[0022] Figure 7 It is a figure which shows the structure of the combustion equipment which concerns on the 3rd Embodiment of this invention.

[0023] Figure 8 This is a flowchart showing the operation of the control device according to the third embodiment of the present invention.

[0024] Fig. 9 This is a functional block diagram of a control device according to a fourth embodiment of the present invention.

[0025] Fig.10This is a flowchart showing the operation of the control device according to the fourth embodiment of the present invention.

[0026] Fig.11 This is a flowchart showing the operation of the control device according to the fourth embodiment of the present invention.

[0027] Fig.12 It is a hardware configuration diagram showing the configuration of a computer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] Hereinafter, a control device according to an embodiment of the present invention will be described with reference to the drawings.

[0029] <First embodiment>

[0030] (Combustion equipment)

[0031] The combustion equipment 100 is, for example, a coal-fired combustion furnace that burns urban garbage, industrial waste, or biomass as a burnt material. Hereinafter, for convenience of explanation, the "burnt material" is referred to as "garbage." The garbage in this embodiment is a fuel for generating a combustion reaction in the combustion furnace.

[0032] like Figure 1 As shown, the combustion equipment 100 includes: a combustion furnace 1, an exhaust heat recovery boiler 12, a cooling tower 13, a dust collecting device 14, an outlet flow path 15, a chimney 16, an induced draft fan 17, a garbage pit 18, an ash pressing device 19, an ash pit 20, a filtrate supply unit 21, an in-furnace water supply unit 22, an exhaust gas recirculation pipeline 23, a denitrification material supply unit 24, an exhaust gas temperature detection unit 25, an oxygen concentration detection unit 26, a flow detection unit 27, and a control device 30.

[0033] (Combustion furnace)

[0034] The combustion furnace 1 is a furnace that burns garbage W while conveying it inside. As the garbage W is burned in the combustion furnace 1 , exhaust gas is generated from the combustion furnace 1 . The generated exhaust gas is sent to an exhaust heat recovery boiler 12 connected to the upper part of the combustion furnace 1 .

[0035] The exhaust heat recovery boiler 12 heats water by exchanging heat between the exhaust gas and water to generate steam. The generated steam is used in a steam turbine or other equipment (not shown) outside the combustion device 100. The exhaust gas passing through the exhaust heat recovery boiler 12 is cooled in the cooling tower 13 and then sent to the dust collector 14. The exhaust gas after the soot and dust are removed in the dust collector 14 is discharged into the atmosphere through the outlet flow path 15 and the chimney 16.

[0036] Here, an induced draft fan 17 (IDF) capable of guiding exhaust gas generated in the combustion furnace 1 toward the chimney 16 is disposed in the middle of the outlet flow path 15. The induced draft fan 17 guides exhaust gas from the combustion furnace 1 to maintain the interior of the combustion furnace 1 at a negative pressure.

[0037] The rotation speed of the induced draft fan 17 (the amount of induced draft of exhaust gas) of this embodiment is controlled by a control device 30 provided outside the combustion furnace 1. Specifically, the induced draft fan 17 receives a signal indicating the rotation speed from the control device 30 via wired or wireless communication.

[0038] That is, the induced draft fan 17 rotates according to the rotation speed indicated by the signal, guides the exhaust gas in the combustion furnace 1, and sends it to the chimney 16. The induced draft fan 17 transmits a signal indicating its output rotation speed to the control device 30 at predetermined time intervals via wired or wireless communication.

[0039] The combustion furnace 1 includes a furnace body 2, a fuel supply mechanism 3, a stoker 4, a wind box 5, an exhaust passage 6, a furnace 7, a forced air blower 8, a primary air line 9, an air preheater 10 (a first adjustment unit, a second adjustment unit) and a secondary air line 11.

[0040] (Furnace body)

[0041] A processing space V for burning the garbage W is formed inside the furnace body 2. In the processing space V, the garbage W is burned while being conveyed in the conveying direction Da ( Figure 1 The waste W calcined in the processing space V is discharged to the outside of the furnace body 2 through the discharge channel 6.

[0042] In the following, for convenience of description, the side from the discharge passage 6 toward the fuel supply mechanism 3 in the conveying direction Da ( Figure 1 The left side of the Dal is referred to as "side Dal". The side of the conveying garbage W opposite to the side Dal ( Figure 1 The right side in the picture is called the "other side Dar".

[0043] (Fuel supply mechanism)

[0044] The fuel supply mechanism 3 receives garbage W from outside the combustion furnace 1 and supplies the received garbage W to the processing space V inside the furnace body 2. The fuel supply mechanism 3 of this embodiment includes a hopper 300 and a feeder 310.

[0045] (hopper)

[0046] The hopper 300 is an entrance of the combustion furnace 1 for supplying garbage W into the furnace body 2. The garbage W is thrown into the hopper 300 from the outside of the combustion furnace 1 by the crane 182. The hopper 300 has an entrance 301 and an exit 302.

[0047] The inlet 301 is an inlet portion of the hopper 300 into which the garbage W enters from the outside. The inlet 301 guides the garbage W supplied from the upper side Dvu in the vertical direction Dv that coincides with the gravity direction to the outlet 302 in the lower side Dvd. The inlet 301 is in the shape of a cylinder extending in the vertical direction Dv. The outlet 302 is connected to the lower part of the inlet 301. Therefore, the garbage W fed into the inlet 301 falls to the lower side Dvd due to gravity.

[0048] In the following, for convenience of explanation, the upper side Dvu ( Figure 1 The upper side in the figure is referred to as "upper side Dvu". Figure 1 The lower side in the DVD is referred to as the "lower side DVD".

[0049] The outlet portion 302 is an outlet part of the hopper 300 that guides the garbage W introduced into the inlet portion 301 to the processing space V inside the furnace body 2. The outlet portion 302 forms a storage space R inside, and the storage space R temporarily stores the garbage W before supplying the garbage W to the processing space V inside the furnace body 2. The outlet portion 302 of this embodiment has a box shape extending in the conveying direction Da.

[0050] (Feeder)

[0051] The feeder 310 is a device for supplying the waste W in the hopper 300 to the processing space V in the furnace body 2. The feeder 310 is disposed so as to be reciprocable in the conveying direction Da relative to a floor surface 302a on the inner surface of the outlet portion 302 facing upward Dvu.

[0052] The end of one side Dal of the feeder 310 is connected to a feeder drive mechanism (not shown) that reciprocates the feeder 310 by hydraulic pressure or the like. The feeder 310 is configured to be able to reciprocate along the conveying direction Da in the storage space R by the feeder drive mechanism. That is, the feeder 310 is configured to be able to advance and retreat from one side Dal toward the other side Dar on the floor 302a of the exit portion 302.

[0053] The feeder 310 is in the shape of a plate extending in the conveying direction Da and the furnace width direction Dw and having a predetermined thickness. The feeder 310 has an upper surface 311 facing the upper side Dvu and an extrusion surface 312 connected to the upper surface 311 and facing the other side Dar. Hereinafter, for convenience of explanation, the width direction of the furnace body 2, which is a direction perpendicular to the conveying direction Da and the up-down direction Dv, is referred to as the "furnace width direction Dw".

[0054] The upper surface 311 is a surface on which the garbage W supplied from the inlet 301 is accumulated. The extrusion surface 312 is a surface on which the garbage W accumulated on the ground 302a is extruded toward the other side Dar. That is, the feeder 310 intermittently extrudes the garbage W in the storage space R toward the processing space V by reciprocating the feeder 310 itself in the conveying direction Da at a predetermined timing.

[0055] The garbage W of this embodiment is compressed inside the storage space R. The garbage W in the storage space R has viscosity, and can be regarded as a continuous body that moves in the entire storage space R in the conveying direction Da.

[0056] That is, the garbage W on the upper surface 311 of the feeder 310 and the garbage W on the floor 302a of the outlet 302 are integrated in the storage space R. Therefore, the extrusion surface 312 of the feeder 310 squeezes the garbage W toward the processing space V, and the garbage W accumulated on the upper surface 311 is also moved toward the processing space V.

[0057] The forward and backward movement of the feeder 310 in the conveying direction Da of this embodiment is controlled by the control device 30. Specifically, the feeder 310 receives a signal indicating the forward and backward instruction from the control device 30. That is, the feeder 310 reciprocates on the floor 302a of the exit portion 302 according to the instruction indicated by the signal.

[0058] Furthermore, the feeder 310 can send a signal to the control device 30 at a predetermined time interval via wired or wireless communication, and the signal indicates the amount of advance and retreat from the reference position, the advance and retreat speed, and the interval of the start time of the advance and retreat. The feeder 310 of this embodiment sends a signal indicating the amount of advance and retreat from the reference position to the control device 30.

[0059] (Stoker)

[0060] The stoker 4 is composed of a plurality of grates (not shown) forming a stoker surface 4a to which garbage W is supplied in layers by the fuel supply mechanism 3. The grate is composed of a fixed grate (not shown) and a movable grate (not shown).

[0061] The fixed grate is fixed to the surface of the wind box 5 facing the upper side Dvu of the wind box 5. The movable grate moves at a constant speed to one side Dal (upstream side) and the other side Dar (downstream side), thereby mixing and conveying the garbage W on the movable grate and the fixed grate (on the stoker surface 4a) to the downstream side. The stoker 4 conveys the garbage W supplied to the stoker surface 4a in a layered manner toward the discharge passage 6 while burning it.

[0062] The furnace body 2 has a drying section 200, a combustion section 201, and a post-combustion section 202 in order from one side Dal. These drying section 200, combustion section 201, and post-combustion section 202 divide the processing space V along the conveying direction Da. The drying section 200 is an area for drying the garbage W supplied from the hopper 300 before being burned on the stoker 4.

[0063] The combustion section 201 and the post-combustion section 202 are areas where the garbage W in a dried state is burned on the stoker 4. In the combustion section 201, diffusion combustion occurs due to the pyrolysis gas generated by the garbage W, and a luminous flame F is generated. In the post-combustion section 202, the fixed carbon of the garbage W after the diffusion combustion is burned, so the luminous flame F is not generated. Therefore, the luminous flame F generated with the combustion is mainly formed in the combustion section 201.

[0064] (bellows)

[0065] The wind box 5 supplies combustion air from below the stoker 4 toward the processing space V. A plurality of wind boxes 5 are arranged along the conveying direction Da. In this embodiment, the furnace body 2 is divided into a drying section 200, a combustion section 201, and a post-combustion section 202 by the wind boxes 5.

[0066] (Exhaust channel)

[0067] The discharge duct 6 is a device for causing the garbage W that has been burned and turned into ash to fall toward the ash pressing device 19 located at the lower side Dvd of the furnace body 2. The discharge duct 6 is provided at the end of the post-combustion stage 202 on the other side Dar.

[0068] (stove)

[0069] The furnace 7 extends from the upper portion of the furnace body 2 toward the upper side Dvu. Exhaust gas generated by burning the garbage W in the processing space V is sent to the waste heat recovery boiler 12 through the furnace 7.

[0070] (Forced Blower)

[0071] The forced blower 8 is a device that pressurizes and conveys air for burning the garbage W in the processing space V toward the inside of the combustion furnace 1. The number of revolutions (flow rate of air) of the forced blower 8 of this embodiment is controlled by the above-mentioned control device 30. Specifically, the forced blower 8 receives a signal indicating the number of revolutions from the control device 30 via wired or wireless communication.

[0072] That is, forced blower 8 rotates according to the number of revolutions indicated by the signal, and pressurizes and delivers the air toward processing space V. Furthermore, forced blower 8 transmits a signal indicating its own output rotation speed to control device 30 at predetermined time intervals via wired or wireless communication.

[0073] The forced blower 8 includes a first forced blower 81 and a second forced blower 82. The first forced blower 81 pressurizes and delivers combustion air to the wind box 5 through the primary air line 9. The second forced blower 82 pressurizes and delivers combustion air to the furnace 7 through the secondary air line 11.

[0074] (1st air line)

[0075] The primary air line 9 is a pipe connecting the first forced blower 81 and the wind box 5. The first forced blower 81 is driven, and the air required for burning the garbage W is supplied to the wind box 5 through the primary air line 9. The air supplied to the wind box 5 is directed toward the garbage W from below the stoker 4. Hereinafter, for convenience of description, the air supplied to the inside of the furnace body 2 through the primary air line 9 is referred to as "combustion air".

[0076] The primary air line 9 has a primary air damper 90. The primary air damper 90 is provided in the middle of the primary air line 9, and the flow rate of the combustion air in the primary air line 9 is limited by the opening of the damper of the primary air damper 90. The opening of the primary air damper 90 of the present embodiment is controlled by the control device 30. Specifically, the primary air damper 90 receives a signal indicating the opening from the control device 30 via wired or wireless communication.

[0077] (Air preheater)

[0078] The air preheater 10 is a heat exchanger that preheats the air that is pressurized and sent from the first forced blower 81. The air preheater 10 is provided in the middle of the primary air line 9, and preheats the primary combustion air that flows from the first forced blower 81 toward the wind box 5.

[0079] The primary combustion air preheated by the air preheater 10 is supplied to the processing space V and utilized for combustion of the garbage W, and performs heat exchange with the exhaust gas generated by the combustion of the garbage W. Therefore, the air preheater 10 can adjust the temperature of the exhaust gas by adjusting the temperature of the combustion air.

[0080] The set temperature (temperature of combustion air) of the air preheater 10 of the present embodiment is controlled by the control device 30. Specifically, the air preheater 10 receives a signal indicating the set temperature from the control device 30 via wired or wireless communication.

[0081] That is, the air preheater 10 preheats the combustion air according to the temperature indicated by the signal. Furthermore, the air preheater 10 transmits a signal indicating its own set temperature to the control device 30 at predetermined time intervals via wired or wireless communication.

[0082] (Secondary air line)

[0083] The secondary air line 11 connects the second forced air blower 82 and the furnace 7. The second forced air blower 82 is driven, and the air required for burning the garbage W is supplied to the furnace 7 through the secondary air line 11. The secondary air supplied to the furnace 7 is directed from above the stoker 4 toward the garbage W. Hereinafter, for convenience of description, the air supplied to the inside of the furnace body 2 through the secondary air line 11 is referred to as "combustion air".

[0084] The secondary air line 11 has a secondary air damper 110. The secondary air damper 110 is provided in the middle of the secondary air line 11, and the flow rate of the secondary air is restricted by the opening of the damper of the secondary air damper 110. The opening of the secondary air damper 110 of the present embodiment is controlled by the control device 30. Specifically, the secondary air damper 110 receives a signal indicating the opening from the control device 30 via wired or wireless communication.

[0085] (Garbage pit)

[0086] The garbage pit 18 stores garbage W and supplies the garbage W to the hopper 300 . The garbage pit 18 includes a garbage pit body 180 , a platform 181 , a crane 182 , and a crane control device 189 .

[0087] The garbage pit body 180 is a chamber for storing garbage W on one side Dal of the combustion furnace 1. The garbage pit body 180 is connected to the inlet 301 of the hopper 300. That is, the inside of the hopper 300 is connected to the inside of the garbage pit body 180, and garbage W can be supplied from the inside of the garbage pit body 180 to the inside of the hopper 300.

[0088] Here, the garbage pit 18 has a first liquid level sensor 18a that can measure the storage amount of the filtrate (wastewater from the garbage W) stored in the garbage pit main body 180. The first liquid level sensor 18a is a sensor that can measure the storage amount of the filtrate in the garbage pit 18 by, for example, measuring the height of the liquid level of the filtrate in the garbage pit 18. The first liquid level sensor 18a is disposed in the garbage pit main body 180. The first liquid level sensor 18a transmits the measurement result to the control device 30 via wired or wireless communication.

[0089] The platform 181 is a carrying-in entrance for carrying the garbage W into the garbage pit main body 180. The platform 181 is connected to a carrying-in opening formed on one side Dal of the garbage pit main body 180. The garbage collection truck T carries the garbage W from the outside of the combustion equipment 100 to the platform 181. The garbage collection truck T puts the carried garbage W into the garbage pit main body 180.

[0090] The crane 182 holds a part of the garbage W stored in the garbage pit main body 180 and transfers the held garbage W from the garbage pit main body 180 to the entrance portion 301 of the hopper 300. The crane 182 is provided at a ceiling portion on the upper side Dvu of the garbage pit main body 180.

[0091] The crane 182 has a track 183 installed on the ceiling, a main beam 184 running along the track 183, a trolley 185 running horizontally on the main beam 184, a wire rope 186 hoisted from the trolley 185, a winch 187 for hoisting and lowering the wire rope 186, and a grab hook 188 installed on the front end of the wire rope 186.

[0092] The crane control device 189 is a device that controls the travel of the main beam 184, the transverse movement of the trolley 185, the hoisting and lowering of the wire rope 186 of the winch 187, and the gripping action of the grab hook 188.

[0093] (Ash pressing device)

[0094] The ash pressing device 19 receives the waste W (ash) that has passed through the discharge passage 6 and fallen to the lower side Dvd of the furnace body 2, and squeezes it out toward the subsequent ash pit 20. The ash pressing device 19 includes an squeezing device body 190 and a squeezing mechanism (not shown).

[0095] The extrusion device body 190 receives the garbage W that has been burned and turned into ash in the processing space V and temporarily accumulates it. The extrusion device body 190 is arranged at a position closer to the lower side Dvd than the furnace body 2. The extrusion device body 190 is connected to the discharge channel 6 from the lower side Dvd. The extrusion mechanism squeezes the garbage W (ash) that falls into the extrusion device body 190 toward the ash pit 20.

[0096] (Ash pit)

[0097] The ash pit 20 is a chamber that receives the waste W in the extruder and stores it therein. The ash pit 20 of this embodiment is connected to the extruder body 190 from the other side Dar. The waste W stored in the ash pit 20 is transferred to the outside of the combustion equipment 100 by, for example, an ash crane or the like (not shown).

[0098] Here, the ash pit 20 has a second liquid level sensor 20a, which can measure the storage amount of the filtrate (sewage from the ash, i.e., garbage W) stored in the ash pit 20. The second liquid level sensor 20a is a sensor that measures the storage amount of the filtrate in the ash pit 20 by, for example, measuring the liquid level of the filtrate in the ash pit 20. The second liquid level sensor 20a is arranged in the ash pit 20. The second liquid level sensor 20a transmits the measurement result to the control device 30 via wired or wireless communication.

[0099] (Filtrate supply unit)

[0100] The filtrate supply unit 21 collects filtrate (wastewater) generated from the garbage W in the garbage pit 18 and the ash pit 20 and supplies it to the combustion furnace 1. The filtrate supply unit 21 includes a first filtrate line 210, a first filtrate pump 211 (a first adjustment unit, a second adjustment unit), a second filtrate line 212, and a second filtrate pump 213 (a first adjustment unit, a second adjustment unit).

[0101] The first filtrate pipeline 210 is a pipe connecting the garbage pit 18 and the furnace 7. The filtrate generated from the garbage W in the garbage pit 18 flows from the garbage pit 18 to the furnace 7 in the first filtrate pipeline 210. One end of the first filtrate pipeline 210 of the present embodiment is connected to the lower part of the garbage pit 18, and the other end of the first filtrate pipeline 210 is connected to the furnace 7 at the lower side Dvd than the connection part with the secondary air pipeline 11 in the furnace 7.

[0102] The first filtrate pump 211 is disposed in the middle of the first filtrate pipeline 210. The first filtrate pump 211 pressurizes and delivers the filtrate generated from the garbage pit 18 to the furnace 7 through the first filtrate pipeline 210. The filtrate pressurized and delivered to the first filtrate pipeline 210 by the first filtrate pump 211 is sprayed into the furnace 7, and heat is exchanged with the exhaust gas flowing in the furnace 7. Therefore, the first filtrate pump 211 can adjust the temperature of the exhaust gas by supplying the filtrate generated in the garbage pit 18 to the combustion furnace 1.

[0103] The start or stop of the first filtrate pump 211 and the rated rotation speed (the flow rate of the filtrate from the garbage pit 18) of the present embodiment are controlled by the above-mentioned control device 30. Specifically, the first filtrate pump 211 receives a signal indicating a start instruction, a signal indicating a stop instruction, or a signal indicating an output rotation speed from the control device 30 via wired or wireless communication.

[0104] That is, the first filtrate pump 211 rotates according to the number of revolutions indicated by the signal, and pressurizes and delivers the filtrate sucked from the garbage pit 18 to the furnace 7. Furthermore, the first filtrate pump 211 transmits a signal indicating its output rotation speed to the control device 30 at predetermined time intervals via wired or wireless communication.

[0105] The second filtrate pipeline 212 is a pipe connecting the ash pit 20 and the furnace 7. The filtrate generated from the garbage W in the ash pit 20 flows from the ash pit 20 to the furnace 7 in the second filtrate pipeline 212. One end of the second filtrate pipeline 212 of the present embodiment is connected to the lower part of the ash pit 20, and the other end of the second filtrate pipeline 212 is connected to the furnace 7 on the lower side Dvd than the connection part with the secondary air pipeline 11 in the furnace 7.

[0106] The second filtrate pump 213 is disposed in the middle of the second filtrate line 212. The second filtrate pump 213 sucks the filtrate generated from the ash pit 20, and pressurizes and delivers the filtrate sucked through the second filtrate line 212 to the furnace 7.

[0107] The filtrate pumped under pressure into the second filtrate line 213 by the second filtrate pump 212 is sprayed into the furnace 7 to exchange heat with the exhaust gas flowing in the furnace 7. Therefore, the second filtrate pump 213 supplies the filtrate generated in the ash pit 20 to the combustion furnace 1, thereby adjusting the temperature of the exhaust gas.

[0108] The start or stop of the second filtrate pump 213 of this embodiment and the rated speed (the flow rate of the filtrate from the ash pit 20) are controlled by the above-mentioned control device 30. Specifically, the second filtrate pump 213 receives a signal indicating a start instruction, a signal indicating a stop instruction, or a signal indicating an output speed from the control device 30 via wired or wireless communication.

[0109] That is, the second filtrate pump 213 rotates according to the number of revolutions indicated by the signal, and pressurizes and delivers the filtrate sucked from the ash pit 20 to the furnace 7. Furthermore, the second filtrate pump 213 transmits a signal indicating its output rotation speed to the control device 30 at predetermined time intervals via wired or wireless communication.

[0110] (Furnace water supply unit)

[0111] The furnace water supply unit 22 supplies furnace water (water) into the combustion furnace 1. The furnace water supply unit 22 includes a water tank 220, a furnace water line 221, and a furnace water pump 222 (a first regulating unit, a second regulating unit).

[0112] The water tank 220 is a water tank for storing furnace water which is not sewage. The water tank 220 of this embodiment is disposed adjacent to the garbage pit main body 180, for example.

[0113] The furnace water pipe line 221 is a pipe connecting the water tank 220 and the furnace 7. The furnace water in the water tank 220 flows from the water tank 220 to the furnace 7 in the furnace water pipe line 221. One end of the furnace water pipe line 221 of the present embodiment is connected to the water tank 220, and the other end of the furnace water pipe line 221 is connected to the furnace 7 on the upper side Dvu of the connection portion with the secondary air pipe line 11 in the furnace 7.

[0114] The furnace water pump 222 is disposed in the middle of the furnace water pipeline 221. The furnace water pump 222 pumps water in the water tank 220 and pressurizes and delivers the furnace water pumped through the furnace water pipeline 221 to the furnace 7.

[0115] The water pumped under pressure to the furnace water line 221 by the furnace water pump 222 is sprayed into the furnace 7 to exchange heat with the exhaust gas flowing in the furnace 7. Therefore, the furnace water pump 222 supplies furnace water to the combustion furnace 1, thereby adjusting the temperature of the exhaust gas.

[0116] The start or stop of the furnace water pump 222 of this embodiment and the rated speed (the flow rate of the furnace water from the water tank 220) are controlled by the above-mentioned control device 30. Specifically, the furnace water pump 222 receives a signal indicating a start instruction, a signal indicating a stop instruction, or a signal indicating an output speed from the control device 30 via wired or wireless communication.

[0117] That is, the furnace water pump 222 rotates according to the number of revolutions indicated by the signal, and pressurizes and delivers the water pumped from the water tank 220 to the furnace 7. The furnace water pump 222 transmits a signal indicating its output speed to the control device 30 at predetermined time intervals via wired or wireless communication.

[0118] (Exhaust gas recirculation line)

[0119] The exhaust gas recirculation line 23 allows the exhaust gas after combustion, which flows in the outlet flow path 15, to flow back into the furnace 7. The exhaust gas recirculation line 23 of the present embodiment is a pipe for realizing EGR (Exhaust Gas Recirculation).

[0120] The exhaust gas recirculation line 23 connects the outlet flow path 15 and the furnace 7. One end of the exhaust gas recirculation line 23 of the present embodiment is connected to the vicinity of the dust collector 14 of the outlet flow path 15, and the other end of the exhaust gas recirculation line 23 is connected to the furnace 7 on the upper side Dvu of the connection portion with the furnace water line 221 in the furnace 7.

[0121] (Denitrification Material Supply Department)

[0122] The denitrification material supply unit 24 supplies denitrification materials such as ammonia water (NH3) or urea water (CH4N2O) to the exhaust gas flowing in the furnace 7. The denitrification material supply unit 24 has a denitrification material supply source 240 and a denitrification material supply pipeline 241. The denitrification material supply source 240 is a device that holds the above-mentioned denitrification material inside and can supply the held denitrification material to the outside. The denitrification material supply source 240 of this embodiment can switch between a state of supplying denitrification materials to the outside, i.e., a "supply state", and a state of not supplying denitrification materials, i.e., a "non-supply state".

[0123] The denitrification material supply line 241 is a pipe connecting the denitrification material supply source 240 and the exhaust gas recirculation line 23. The denitrification material in the denitrification material supply line 241 flows from the denitrification material supply source 240 to the exhaust gas recirculation line 23 in the denitrification material supply line 241. The denitrification material flowing into the exhaust gas recirculation line 23 merges with the exhaust gas flowing from the outlet flow path 15 to the furnace 7 in the exhaust gas recirculation line 23, and is supplied to the furnace 7 together with the merged exhaust gas.

[0124] The control device 30 controls whether the denitrification material supply unit 24 is in a supply state or a non-supply state. Specifically, the denitrification material supply source 240 of the denitrification material supply unit 24 receives a signal indicating the presence or absence (state) of the denitrification material supply from the control device 30 via wired or wireless communication.

[0125] That is, the denitrification material supply unit 24 transitions from the supply state to the non-supply state, or from the non-supply state to the supply state, according to the instruction indicated by the signal. Furthermore, the denitrification material supply source 240 of the denitrification material supply unit 24 transmits a signal indicating the presence (state) of its own denitrification material supply to the control device 30 at a predetermined time interval via wired or wireless communication.

[0126] (Exhaust gas temperature detection unit)

[0127] The exhaust gas temperature detection unit 25 is a sensor that detects the gas temperature of the exhaust gas flowing in the combustion furnace 1. The exhaust gas temperature detection unit 25 is arranged in the furnace 7. Specifically, the exhaust gas temperature detection unit 25 is arranged in the furnace 7 on the downstream side of the connection portion of the furnace 7 with the exhaust gas recirculation line 23. The exhaust gas temperature detection unit 25 sends the detection result to the control device 30 via wired or wireless communication.

[0128] (Oxygen concentration detection unit)

[0129] The oxygen concentration detector 26 is a sensor for detecting the oxygen concentration of the exhaust gas. The oxygen concentration detector 26 is provided in the outlet flow path 15. Specifically, the oxygen concentration detector 26 is arranged in the outlet flow path 15 on the chimney 16 side of the induced draft fan 17 of the outlet flow path 15.

[0130] The oxygen concentration detector 26 detects the oxygen concentration of the exhaust gas flowing from the combustion furnace 1 to the outlet flow path 15, thereby indirectly detecting the oxygen concentration of the exhaust gas in the combustion furnace 1. The oxygen concentration detector 26 transmits the detection result to the control device 30 via wired or wireless communication.

[0131] (Flow rate detection unit)

[0132] The flow rate detection unit 27 is a sensor for detecting the flow rate of the combustion air. The flow rate detection unit 27 is provided in the middle of the primary air line 9. Specifically, the flow rate detection unit 27 is arranged in the primary air line 9 on the wind box 5 side of the air preheater 10 of the primary air line 9. The flow rate detection unit 27 sends the detection result to the control device 30 via wired or wireless communication.

[0133] (Control device)

[0134] The control device 30 sends and receives signals with the above-mentioned various devices, thereby adjusting the exhaust gas temperature in the combustion furnace 1. Figure 2 As shown, the control device 30 of the present embodiment includes an acquisition unit 31 , a determination unit 32 , a first control unit 33 , a second control unit 34 , and a storage unit 35 .

[0135] (Acquisition Department)

[0136] The acquisition unit 31 receives signals from the above-mentioned various devices and acquires values, states, etc. indicated by the received signals from the various devices.

[0137] (obtained from induced draft fan)

[0138] The acquisition unit 31 receives a signal transmitted from the induced draft fan 17, thereby acquiring the output speed of the induced draft fan 17 indicated by the signal. The acquisition unit 31 transmits the acquired output speed of the induced draft fan 17 to the determination unit 32.

[0139] (obtained from feeder)

[0140] The acquisition unit 31 receives a signal transmitted from the feeder 310 , thereby acquiring the amount of advance and retreat of the feeder 310 from the reference position indicated by the signal. The acquisition unit 31 transmits the acquired amount of advance and retreat of the feeder 310 from the reference position to the determination unit 32 .

[0141] (obtained from forced blower)

[0142] The acquisition unit 31 receives signals transmitted from the first forced blower 81 and the second forced blower 82, respectively, and thereby acquires the output speeds of the first forced blower 81 and the second forced blower 82 indicated by these signals. The acquisition unit 31 transmits the acquired output speeds of the first forced blower 81 and the second forced blower 82 to the determination unit 32.

[0143] (obtained from air preheater)

[0144] The acquisition unit 31 receives a signal transmitted from the air preheater 10, thereby acquiring the set temperature of the air preheater 10 indicated by the signal. The acquisition unit 31 transmits the acquired set temperature of the air preheater 10 to the determination unit 32.

[0145] (obtained from the first and second liquid level sensors)

[0146] The acquisition unit 31 receives a signal sent from the first liquid level sensor 18a, thereby acquiring the filtrate storage amount (measurement result) of the garbage pit 18 indicated by the signal. In addition, the acquisition unit 31 receives a signal sent from the second liquid level sensor 20a, thereby acquiring the filtrate storage amount (measurement result) of the ash pit 20 indicated by the signal. The acquisition unit 31 transmits the acquired filtrate storage amounts in the garbage pit 18 and the ash pit 20 to the determination unit 32.

[0147] (obtained from the 1st filtrate pump and the 2nd filtrate pump)

[0148] The acquisition unit 31 receives a signal sent from the first filtrate pump 211, thereby acquiring the output speed of the first filtrate pump 211 indicated by the signal. In addition, the acquisition unit 31 receives a signal sent from the second filtrate pump 213, thereby acquiring the output speed of the second filtrate pump 213 indicated by the signal. The acquisition unit 31 transmits the acquired output speeds of the first filtrate pump 211 and the second filtrate pump 213 to the determination unit 32.

[0149] (obtained from the water pump in the furnace)

[0150] The acquisition unit 31 receives a signal transmitted from the furnace water pump 222, thereby acquiring the output speed of the furnace water pump 222 indicated by the signal. The acquisition unit 31 transmits the acquired output speed of the furnace water pump 222 to the determination unit 32.

[0151] (Obtained from the denitrification material supply department)

[0152] The acquisition unit 31 receives a signal sent from the denitrification material supply source 240 of the denitrification material supply unit 24 , and acquires the presence (state) of the denitrification material supply from the denitrification material supply source 240 indicated by the signal. The acquisition unit 31 transmits the acquired supply state of the denitrification material from the denitrification material supply source 240 to the determination unit 32 .

[0153] (obtained from the exhaust gas temperature detection unit)

[0154] The acquisition unit 31 receives a signal sent from the exhaust gas temperature detection unit 25 , thereby acquiring the gas temperature (detection result) of the exhaust gas in the furnace 7 indicated by the signal. The acquisition unit 31 transmits the acquired gas temperature of the exhaust gas to the determination unit 32 .

[0155] (obtained from the oxygen concentration detection unit)

[0156] The acquisition unit 31 receives the signal sent from the oxygen concentration detection unit 26 , thereby acquiring the oxygen concentration (detection result) of the exhaust gas flowing in the outlet flow path 15 indicated by the signal. The acquisition unit 31 transmits the acquired oxygen concentration of the exhaust gas to the determination unit 32 .

[0157] (obtained from the flow detection department)

[0158] The acquisition unit 31 receives a signal sent from the flow rate detection unit 27 , thereby acquiring the flow rate (detection result) of the combustion air flowing in the primary air line indicated by the signal. The acquisition unit 31 transmits the acquired flow rate of the combustion air to the determination unit 32 .

[0159] (Judgment Department)

[0160] The determination unit 32 performs determination processing based on the values ​​or states indicated by the signals of various devices received from the acquisition unit 31 and various predetermined values ​​stored in advance in the storage unit 35 .

[0161] (About the determination of induced draft fans)

[0162] When receiving the output speed of the induced draft fan 17 from the acquisition unit 31, the determination unit 32 divides the output speed by the maximum output speed of the induced draft fan 17 pre-stored in the storage unit 35, and obtains the ratio (%) of the output speed to the maximum output speed. Hereinafter, for convenience of explanation, the obtained ratio is referred to as "the speed of the induced draft fan 17".

[0163] The determination unit 32 compares the number of revolutions of the induced draft fan 17 with a predetermined first ratio threshold value P1 (%) pre-stored in the storage unit 35. When the number of revolutions of the induced draft fan 17 is less than or equal to the first ratio threshold value P1, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is less than or equal to the first ratio threshold value P1", and stores the time of determination in the storage unit 35.

[0164] On the other hand, when the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 confirms the difference between this time and the time when it is determined that "the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1" after the time when it is last determined that "the number of revolutions of the induced draft fan 17 is less than the first ratio threshold value P1".

[0165] At this time, the determination unit 32 determines whether the difference is greater than or equal to the first duration t1 pre-stored in the storage unit 35. When the time difference is less than the first duration t1, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1 and less than the first duration t1". On the other hand, when the time difference is greater than or equal to the first duration t1, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1 and is greater than or equal to the first duration t1".

[0166] Furthermore, when the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1 and less than the first duration t1", the determination unit 32 compares the number of revolutions of the induced draft fan 17 with a predetermined second ratio threshold value P2 (%) pre-stored in the storage unit 35. When the number of revolutions of the induced draft fan 17 is less than the second ratio threshold value P2, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is less than the second ratio threshold value P2", and stores the time of determination in the storage unit 35.

[0167] On the other hand, when the number of revolutions of the induced draft fan 17 is greater than the second ratio threshold value P2, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is greater than the second ratio threshold value P2", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 confirms the difference between this time and the time when it is determined that "the number of revolutions of the induced draft fan 17 is greater than the second ratio threshold value P2" after the time when it is last determined that "the number of revolutions of the induced draft fan 17 is less than the second ratio threshold value P2".

[0168] At this time, the determination unit 32 determines whether the difference is greater than or equal to the first duration t1 pre-stored in the storage unit 35. When the time difference is less than the first duration t1, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is greater than the second ratio threshold value P2 and less than the first duration t1". On the other hand, when the time difference is greater than or equal to the first duration t1, the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is greater than the second ratio threshold value P2 and is greater than or equal to the first duration t1".

[0169] The first ratio threshold value P1 of the present embodiment is smaller than the second ratio threshold value P2. The first ratio threshold value P1 and the second ratio threshold value P2 of the present embodiment are, for example, numerical values ​​greater than 90% and less than 100%. In addition, the first ratio threshold value P1 and the second ratio threshold value P2 may be numerical values ​​less than 90%. Furthermore, the first duration t1 is, for example, a time greater than 1 second and less than 10 seconds. In addition, the first duration t1 may be a time greater than 10 seconds.

[0170] (About the determination of the exhaust gas temperature detection unit)

[0171] When receiving the gas temperature of the exhaust gas from the acquisition unit 31, the determination unit 32 determines whether the gas temperature is higher than a predetermined first gas temperature G1 pre-stored in the storage unit 35. When the gas temperature is lower than the first gas temperature G1, the determination unit 32 determines that "the gas temperature is lower than the first gas temperature G1" and stores the time of determination in the storage unit 35.

[0172] On the other hand, when the gas temperature is higher than the first gas temperature G1, the determination unit 32 determines that "the gas temperature is higher than the first gas temperature G1", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 checks the difference between this time and the time when it is determined that "the gas temperature is higher than the first gas temperature G1" after the time when it is last determined that "the gas temperature is lower than the first gas temperature G1".

[0173] At this time, the determination unit 32 determines whether the difference is equal to or longer than a predetermined second duration t2 stored in advance in the storage unit 35. If the time difference is shorter than the second duration t2, the determination unit 32 determines that the gas temperature is higher than the first gas temperature G1 and shorter than the second duration t2.

[0174] On the other hand, when the time difference is equal to or longer than the second duration t2, the determination unit 32 determines that "the gas temperature is higher than the first gas temperature G1 and is equal to or longer than the second duration t2".

[0175] Furthermore, when the determination unit 32 determines that “the gas temperature is lower than the first gas temperature G1” or “the gas temperature is higher than the first gas temperature G1 and lower than the second duration t2”, it determines whether the gas temperature is lower than the specified second gas temperature G2 pre-stored in the storage unit 35. When the gas temperature is higher than the second gas temperature G2, the determination unit 32 determines that “the gas temperature is higher than the second gas temperature G2” and stores the determination time in the storage unit 35.

[0176] On the other hand, when the gas temperature is lower than the second gas temperature G2, the determination unit 32 determines that "the gas temperature is lower than the second gas temperature G2", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 checks the difference between this time and the time when it is determined that "the gas temperature is lower than the second gas temperature G2" after the time when it is last determined that "the gas temperature is higher than the second gas temperature G2".

[0177] At this time, the determination unit 32 determines whether the difference is equal to or longer than the second duration t2 stored in advance in the storage unit 35. If the time difference is shorter than the second duration t2, the determination unit 32 determines that "the gas temperature is lower than the second gas temperature G2 and shorter than the second duration t2".

[0178] On the other hand, when the time difference is equal to or longer than the second duration t2, the determination unit 32 determines that "the gas temperature is lower than the second gas temperature G2 and is equal to or longer than the second duration t2".

[0179] Furthermore, when receiving the gas temperature of the exhaust gas from the acquisition unit 31, the determination unit 32 determines whether the gas temperature is equal to or higher than a predetermined third gas temperature G3 pre-stored in the storage unit 35. When the gas temperature is lower than the third gas temperature G3, the determination unit 32 determines that "the gas temperature is lower than the third gas temperature G3" and stores the time of determination in the storage unit 35.

[0180] On the other hand, when the gas temperature is equal to or higher than the third gas temperature G3, the determination unit 32 determines that "the gas temperature is equal to or higher than the third gas temperature G3", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 checks the difference between this time and the time when the gas temperature is determined to be equal to or higher than the third gas temperature G3 after the time when the gas temperature is determined to be lower than the third gas temperature G3.

[0181] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2 pre-stored in the storage unit 35. When the time difference is less than the second duration t2, the determination unit 32 determines that "the gas temperature is greater than or equal to the third gas temperature G3 and less than the second duration t2". On the other hand, when the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the gas temperature is greater than or equal to the third gas temperature G3 and is greater than or equal to the second duration t2".

[0182] Furthermore, when the determination unit 32 determines that “the gas temperature is lower than the third gas temperature G3” or “the gas temperature is higher than the third gas temperature G3 and lower than the second duration t2”, it determines whether the gas temperature is lower than the fourth gas temperature G4 pre-stored in the storage unit 35. When the gas temperature is higher than the fourth gas temperature G4, the determination unit 32 determines that “the gas temperature is higher than the fourth gas temperature G4” and stores the determination time in the storage unit 35.

[0183] On the other hand, when the gas temperature is lower than or equal to the fourth gas temperature G4, the determination unit 32 determines that "the gas temperature is lower than or equal to the fourth gas temperature G4", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 checks the difference between this time and the time when it was determined that "the gas temperature is lower than or equal to the fourth gas temperature G4" after the time when it was last determined that "the gas temperature is higher than the fourth gas temperature G4".

[0184] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2 pre-stored in the storage unit 35. When the time difference is less than the second duration t2, the determination unit 32 determines that "the gas temperature is less than or equal to the fourth gas temperature G4 and less than the second duration t2". On the other hand, when the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the gas temperature is less than or equal to the fourth gas temperature G4 and greater than or equal to the second duration t2".

[0185] Furthermore, when the determination unit 32 receives the gas temperature of the exhaust gas from the acquisition unit 31 and determines that "the number of revolutions of the induced draft fan 17 is less than or equal to the first ratio threshold value P1" or "the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1 and less than the first duration t1", it determines whether the gas temperature is greater than or equal to the prescribed fifth gas temperature G5 pre-stored in the storage unit 35. When the gas temperature is less than the fifth gas temperature G5, the determination unit 32 determines that "the gas temperature is less than the fifth gas temperature G5" and stores the time of determination in the storage unit 35.

[0186] On the other hand, when the gas temperature is equal to or higher than the fifth gas temperature G5, the determination unit 32 determines that "the gas temperature is equal to or higher than the fifth gas temperature G5", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 checks the difference between this time and the time when the gas temperature is determined to be equal to or higher than the fifth gas temperature G5 after the time when the gas temperature is determined to be lower than the fifth gas temperature G5.

[0187] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2 pre-stored in the storage unit 35. When the time difference is less than the second duration t2, the determination unit 32 determines that "the gas temperature is greater than or equal to the fifth gas temperature G5 and less than the second duration t2". On the other hand, when the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the gas temperature is greater than or equal to the fifth gas temperature G5 and is greater than or equal to the second duration t2".

[0188] In addition, when the determination unit 32 determines that "the number of revolutions of the induced draft fan 17 is less than the second ratio threshold value P2" or "the number of revolutions of the induced draft fan 17 is greater than the second ratio threshold value P2 and less than the first duration t1", the determination unit 32 determines whether the gas temperature is less than the specified sixth gas temperature G6 pre-stored in the storage unit 35.

[0189] Similarly, when the determination unit 32 determines that "the gas temperature is lower than the fifth gas temperature G5" or "the gas temperature is higher than the fifth gas temperature G5 and lower than the second duration t2", it determines whether the gas temperature is lower than the sixth gas temperature G6. When the gas temperature is higher than the sixth gas temperature G6, the determination unit 32 determines that "the gas temperature is higher than the sixth gas temperature G6" and stores the determination time in the storage unit 35.

[0190] On the other hand, when the gas temperature is lower than the sixth gas temperature G6, the determination unit 32 determines that "the gas temperature is lower than the sixth gas temperature G6", and stores the time of determination in the storage unit 35. At the same time, the determination unit 32 checks the difference between this time and the time when the gas temperature is determined to be lower than the sixth gas temperature G6 after the time when the gas temperature is last determined to be higher than the sixth gas temperature G6.

[0191] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2 pre-stored in the storage unit 35. When the time difference is less than the second duration t2, the determination unit 32 determines that "the gas temperature is less than the sixth gas temperature G6 and less than the second duration t2". On the other hand, when the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the gas temperature is less than the sixth gas temperature G6 and is greater than or equal to the second duration t2".

[0192] The first gas temperature G1 of the present embodiment is higher than the second gas temperature G2. The first gas temperature G1 and the second gas temperature G2 of the present embodiment are, for example, values ​​of 900° C. or higher and less than 1000° C. Alternatively, the first gas temperature G1 and the second gas temperature G2 may be values ​​less than 900° C. or greater than 1000° C.

[0193] Furthermore, the third gas temperature G3 is greater than the fourth gas temperature G4. The third gas temperature G3 and the fourth gas temperature G4 of the present embodiment are, for example, values ​​of 900° C. or higher and less than 1000° C. Alternatively, the third gas temperature G3 and the fourth gas temperature G4 may be values ​​less than 900° C. or greater than 1000° C.

[0194] Furthermore, the fifth gas temperature G5 is greater than the sixth gas temperature G6. The fifth gas temperature G5 and the sixth gas temperature G6 of the present embodiment are, for example, values ​​of 900° C. or more and less than 1100° C. In addition, the fifth gas temperature G5 and the sixth gas temperature G6 may be values ​​less than 900° C. or greater than 1100° C.

[0195] Regarding the first gas temperature G1, the second gas temperature G2, the third gas temperature G3, and the fourth gas temperature G4, the fifth gas temperature G5, the sixth gas temperature G6, the first gas temperature G1, the second gas temperature G2, the third gas temperature G3, and the fourth gas temperature G4 are high in order. Also, the second duration t2 is, for example, a time of more than 1 second and less than 60 seconds. Alternatively, the second duration t2 may be a time of more than 60 seconds.

[0196] (About the judgment of air preheater)

[0197] After receiving the set temperature of the air preheater 10 from the acquisition unit 31 , when the determination unit 32 determines that “the gas temperature is higher than the first gas temperature G1 and is longer than the second duration t2 ”, it determines whether the set temperature is higher than the specified first combustion temperature T1 stored in the storage unit 35 .

[0198] When the set temperature is equal to or higher than the first combustion temperature T1, the determination unit 32 determines that the set temperature is equal to or higher than the first combustion temperature T1. On the other hand, when the set temperature is lower than the first combustion temperature T1, the determination unit 32 determines that the set temperature is lower than the first combustion temperature T1.

[0199] Furthermore, when the determination unit 32 receives the set temperature of the air preheater 10 from the acquisition unit 31 and determines that "the gas temperature of the exhaust gas is lower than the second gas temperature G2 and is longer than the second duration t2", it determines whether the set temperature is lower than the specified second combustion temperature T2 stored in the storage unit 35.

[0200] When the set temperature is lower than the second combustion temperature T2, the determination unit 32 determines that "the set temperature is lower than the second combustion temperature T2". On the other hand, when the set temperature is higher than the second combustion temperature T2, the determination unit 32 determines that "the set temperature is higher than the second combustion temperature T2".

[0201] The first combustion temperature T1 of the present embodiment is lower than the second combustion temperature T2. The first combustion temperature T1 and the second combustion temperature T2 of the present embodiment are, for example, values ​​of 100° C. or higher and less than 200° C. Alternatively, the first combustion temperature T1 and the second combustion temperature T2 may be values ​​of less than 100° C. or greater than 200° C.

[0202] (First control unit)

[0203] The first control unit 33 can control any one of the air preheater 10, the first filtrate pump 211, the second filtrate pump 213, and the furnace water pump 222 as the first adjustment unit, and any one of the air preheater 10, the first filtrate pump 211, the second filtrate pump 213, and the furnace water pump 222 as the second adjustment unit different from the first adjustment unit.

[0204] The first control unit 33 selectively controls one or more of the first adjustment unit and the second adjustment unit according to the state in the combustion device 100. For example, the first control unit 33 selectively controls one or more of the first adjustment unit and the second adjustment unit according to the detection result (gas temperature) of the exhaust gas temperature detection unit 25 as the state in the combustion device 100.

[0205] (About air preheater control)

[0206] When the determination unit 32 determines that the set temperature is equal to or higher than the first combustion temperature T1, the first control unit 33 sends a signal indicating an instruction to lower the set temperature to the air preheater 10 as the first adjustment unit or the second adjustment unit. Specifically, the first control unit 33 sends a signal indicating an instruction to lower the specified "adjustment temperature Ta" pre-stored in the storage unit 35 by every specified "unit time tu" pre-stored in the storage unit 35 to the air preheater 10, and stores the sending time in the storage unit 35.

[0207] Furthermore, when the determination unit 32 determines that "the set temperature is less than or equal to the second combustion temperature T2", the first control unit 33 sends a signal indicating an instruction to increase the set temperature to the air preheater 10. Specifically, the first control unit 33 sends a signal to the air preheater 10, and stores only the time of the initial transmission in the storage unit 35, indicating an instruction to increase the adjustment temperature Ta per unit time tu.

[0208] Here, when receiving the set temperature of the air preheater 10 from the acquisition unit 31, the determination unit 32 compares the difference between the transmission time stored in the storage unit 35 by the first control unit 33 and the current time with the unit time tu. When the difference is less than the unit time tu, the determination unit 32 determines that "the unit time tu or more has not passed since the last temperature control". On the other hand, when the difference is greater than the unit time tu, the determination unit 32 determines that "the unit time tu or more has passed since the last temperature control".

[0209] The predetermined unit time tu pre-stored in the storage unit 35 of the present embodiment is, for example, a time of 1 minute or more and 60 minutes or less. Alternatively, the unit time tu may be a time of 60 minutes or more. Furthermore, the adjustment temperature Ta is, for example, a temperature of 1° C. or more and 100° C. or less. Alternatively, the adjustment temperature Ta may be a temperature of 100° C. or more.

[0210] (Regarding the control of the first filtrate pump and the second filtrate pump)

[0211] Furthermore, when the determination unit 32 determines that "the gas temperature is equal to or higher than the third gas temperature G3 and is equal to or longer than the second duration t2", the first control unit 33 sends a signal indicating a start instruction to the first filtrate pump 211 and the second filtrate pump 213, which are the first adjustment unit or the second adjustment unit. On the other hand, when the determination unit 32 determines that "the gas temperature is equal to or lower than the fourth gas temperature G4 and is equal to or longer than the second duration t2", the first control unit 33 sends a signal indicating a stop instruction to the first filtrate pump 211 and the second filtrate pump 213.

[0212] (Regarding the control of the water pump in the furnace)

[0213] Furthermore, when the determination unit 32 determines that "the gas temperature is equal to or higher than the fifth gas temperature G5 and is equal to or longer than the second duration t2", the first control unit 33 sends a signal indicating a start instruction to the furnace water pump 222, which is the first adjustment unit or the second adjustment unit. On the other hand, when the determination unit 32 determines that "the gas temperature is lower than the sixth gas temperature G6 and is equal to or longer than the second duration t2", the first control unit 33 sends a signal indicating a stop instruction to the furnace water pump 222.

[0214] (Second control unit)

[0215] After the first control unit 33 selectively controls one or more of the first adjustment unit and the second adjustment unit, the second control unit 34 controls the denitrification material supply unit 24 to supply the denitrification material to the exhaust gas in the combustion equipment 100. Specifically, after one or more of the first adjustment unit and the second adjustment unit are controlled, the second control unit 34 sends a signal indicating a supply instruction to the denitrification material supply source 240 of the denitrification material supply unit 24.

[0216] (Control device operation)

[0217] Next, the operation of the control device 30 will be described. Figure 3 An example of the operation of the control device 30 when the first adjustment unit or the second adjustment unit is the air preheater 10 will be described. However, the order of the processing described below is not limited to the following example, and may be appropriately changed.

[0218] The acquisition unit 31 acquires the set temperature of the air preheater 10 from the air preheater 10 (step S0). Next, the determination unit 32 determines whether the unit time tu has passed since the last set temperature control (step S1). If the determination unit 32 determines that the unit time tu has not passed since the last temperature control (step S1: No), the process of step S0 is performed again.

[0219] If the determination unit 32 determines that the unit time tu or more has passed since the last temperature control (step S1: Yes), the acquisition unit 31 acquires the gas temperature of the exhaust gas from the exhaust gas temperature detection unit 25 (step S2). Next, the determination unit 32 determines whether the gas temperature is higher than the first gas temperature G1, and if the gas temperature is higher than the first gas temperature G1, determines whether the state where the gas temperature is higher than the first gas temperature G1 continues for more than the second duration t2 (step S3).

[0220] If the determination unit 32 determines that the gas temperature is higher than the first gas temperature G1 and is longer than the second duration t2 (step S3: Yes), the determination unit 32 determines whether the set temperature of the air preheater 10 is higher than the first combustion temperature T1 (step S4). If the determination unit 32 determines that the set temperature is lower than the first combustion temperature T1 (step S4: No), the process of step S0 is performed again.

[0221] If the determination unit 32 determines that the set temperature is equal to or higher than the first combustion temperature T1 (step S4: Yes), the first control unit 33 sends a signal to the air preheater 10, indicating that the set temperature is lowered by the adjustment temperature Ta per unit time tu (step S5). After the processing of step S5 is completed, the processing of step S0 is performed again.

[0222] If the determination unit 32 determines that the gas temperature is lower than the first gas temperature G1, or the gas temperature is higher than the first gas temperature G1 and lower than the second duration t2 (step S3: No), the determination unit 32 determines whether the gas temperature is higher than the second gas temperature G2, and if the gas temperature is higher than the second gas temperature G2, determines whether the state in which the gas temperature is higher than the second gas temperature G2 continues for more than the second duration t2 (step S6).

[0223] If the determination unit 32 determines that the gas temperature is higher than the second gas temperature G2 and is longer than the second duration t2 (step S6: Yes), the determination unit 32 determines whether the set temperature of the air preheater 10 is higher than the second combustion temperature T2 (step S7). If the determination unit 32 determines that the set temperature is lower than the second combustion temperature T2 (step S7: No), the process of step S0 is performed again.

[0224] If the determination unit 32 determines that the set temperature is equal to or higher than the second combustion temperature T2 (step S7: Yes), the first control unit 33 sends a signal to the air preheater 10 indicating that the set temperature is increased by the adjustment temperature Ta per unit time tu (step S8). After the processing of step S8 is completed, the processing of step S0 is performed again.

[0225] If the determination unit 32 determines that the gas temperature is lower than the second gas temperature G2 or that the gas temperature is higher than the second gas temperature G2 and shorter than the second duration t2 (step S6 : No), the process of step S0 is performed again.

[0226] The processing from step S1 to step S8 described above is repeatedly executed during the operation phase of the combustion equipment 100 .

[0227] Below, reference Figure 4 , an example of the operation of the control device 30 when the first adjustment unit or the second adjustment unit is the first filtrate pump 211 and the second filtrate pump 213 is described. However, the order of the processing described below is not limited to the following example, and can also be appropriately replaced.

[0228] The acquisition unit 31 acquires the gas temperature of the exhaust gas from the air preheater 10 (step S10). Next, the determination unit 32 determines whether the gas temperature is equal to or higher than the third gas temperature G3, and if the gas temperature is equal to or higher than the third gas temperature G3, determines whether the state of the gas temperature being equal to or higher than the third gas temperature G3 continues for more than the second duration t2 (step S11).

[0229] If the determination unit 32 determines that the gas temperature is equal to or higher than the third gas temperature G3 and is equal to or higher than the second duration t2 (step S11: Yes), the first control unit 33 sends a signal indicating a start instruction to the first filtrate pump 211 and the second filtrate pump 213 (step S12). After the process of step S12 is completed, the process of step S10 is performed again.

[0230] If the determination unit 32 determines that the gas temperature is lower than the third gas temperature G3, or the gas temperature is higher than the third gas temperature G3 and lower than the second duration t2 (step S11: No), the determination unit 32 determines whether the gas temperature is lower than the fourth gas temperature G4, and if the gas temperature is lower than the fourth gas temperature G4, determines whether the state of the gas temperature being lower than the fourth gas temperature G4 has continued for more than the second duration t2 (step S13).

[0231] If the determination unit 32 determines that the gas temperature is lower than the fourth gas temperature G4 and is longer than the second duration t2 (step S13: Yes), the first control unit 33 sends a signal indicating a stop instruction to the first filtrate pump 211 and the second filtrate pump 213 (step S14). After the process of step S14 is completed, the process of step S10 is performed again.

[0232] If the determination unit 32 determines that the gas temperature is higher than the fourth gas temperature G4 or the gas temperature is lower than the fourth gas temperature G4 and shorter than the second duration t2 (step S13 : No), the process of step S10 is performed again.

[0233] The processing from step S10 to step S14 described above is repeatedly executed during the operation phase of the combustion equipment 100 .

[0234] Below, reference Figure 5 , an example of the operation of the control device 30 when the first adjustment unit or the second adjustment unit is the furnace water pump 222 is described. However, the order of the processing described below is not limited to the following example, and can be appropriately replaced.

[0235] The acquisition unit 31 acquires the gas temperature of the exhaust gas from the air preheater 10 (step S20). Next, the acquisition unit 31 acquires the number of revolutions of the induced draft fan 17 (step S21). Next, the determination unit 32 determines whether the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1, and if the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1, determines whether the state in which the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1 continues for a time shorter than the first duration t1 (step S22).

[0236] If the determination unit 32 determines that the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1 and less than the first duration t1 (step S22: yes), the determination unit 32 determines whether the gas temperature is greater than the fifth gas temperature G5, and if the gas temperature is greater than the fifth gas temperature G5, determines whether the state of the gas temperature being greater than the fifth gas temperature G5 has continued for greater than the second duration t2 (step S23).

[0237] If the determination unit 32 determines that the gas temperature is equal to or higher than the fifth gas temperature G5 and is equal to or higher than the second duration t2 (step S23: Yes), the first control unit 33 sends a signal indicating a start instruction to the furnace water pump 222 (step S24). After the processing of step S24 is completed, the processing of step S20 is performed again.

[0238] If the determination unit 32 determines that the speed of the induced draft fan 17 is below the first ratio threshold value P1, or the speed of the induced draft fan 17 is greater than the first ratio threshold value P1 and is greater than the first duration t1 (step S22: No), the determination unit 32 determines whether the speed of the induced draft fan 17 is greater than the second ratio threshold value P2, and if the speed of the induced draft fan 17 is greater than the second ratio threshold value P2, determines whether the state in which the speed of the induced draft fan 17 is greater than the second ratio threshold value P2 has continued for a time shorter than the first duration t1 (step S25).

[0239] If the determination unit 32 determines that the number of revolutions of the induced draft fan 17 is greater than the first ratio threshold value P1 and less than the first duration t1 (step S25: yes), the determination unit 32 determines whether the gas temperature is lower than the sixth gas temperature G6, and if the gas temperature is lower than the sixth gas temperature G6, determines whether the state in which the gas temperature is lower than the sixth gas temperature G6 has continued for more than the second duration t2 (step S26).

[0240] If the determination unit 32 determines that the gas temperature is lower than the sixth gas temperature G6 and is longer than the second duration t2 (step S26: Yes), the first control unit 33 sends a signal indicating a stop instruction to the furnace water pump 222 (step S27). After the process of step S27 is completed, the process of step S20 is performed again.

[0241] Then, in step S25 , if the determination unit 32 determines that the rotation speed of the induced draft fan 17 is less than or equal to the second ratio threshold value P2 or the rotation speed of the induced draft fan 17 is greater than the second ratio threshold value P2 and is longer than the first duration t1 (step S25 : No), the process proceeds to step S27 .

[0242] Then, in step S26 , if the determination unit 32 determines that the gas temperature is equal to or higher than the sixth gas temperature G6 or that the gas temperature is lower than the sixth gas temperature G6 and shorter than the second duration t2 (step S26 : No), the process of step S20 is performed again.

[0243] Then, in step S23 , if the determination unit 32 determines that the gas temperature is equal to or lower than the fifth gas temperature G5 or that the gas temperature is equal to or higher than the fifth gas temperature G5 and is less than the second duration t2 (step S23 : No), the process proceeds to step S26 .

[0244] The processing from step S20 to step S27 described above is repeatedly executed during the operation phase of the combustion equipment 100 .

[0245] (Effect)

[0246] According to the control device 30 according to the first embodiment, after selectively controlling one or more of the first adjustment unit and the second adjustment unit that adjust the gas temperature of the exhaust gas, the denitrification agent supply unit is controlled to supply the denitrification agent to the exhaust gas in the combustion equipment 100 .

[0247] Thus, compared with the configuration of the control device 30 having only one adjustment unit as a mechanism for adjusting the gas temperature, for example, it is possible to selectively perform control to adjust the gas temperature in accordance with the state in the combustion device 100. Therefore, it is possible to suppress deterioration of the combustion state in the combustion device 100, and as a result, it is possible to stabilize the exhaust gas temperature of the combustion device 100.

[0248] Furthermore, according to the control device 30 according to the first embodiment, the first adjustment unit is an adjustment unit that adjusts any one of the amount of filtrate, the temperature of the combustion air, or the amount of water sprayed in the furnace. Furthermore, the second adjustment unit is an adjustment unit that adjusts any other of the amount of filtrate, the temperature of the combustion air, or the amount of water sprayed in the furnace. In addition, the first control unit 33 selectively controls one or more of the first adjustment unit and the second adjustment unit based on the gas temperature as the detection result of the exhaust gas temperature detection unit 25 as the state in the combustion equipment 100.

[0249] In this way, the effects of the above-described embodiment can be achieved with a more specific structure. Furthermore, since the first control unit 33 selectively controls the first adjustment unit and the second adjustment unit according to the gas temperature of the exhaust gas, deterioration of the combustion state in the combustion equipment 100 can be further suppressed.

[0250] <Second embodiment>

[0251] Next, the structure of the control device 30 of the combustion equipment 100 according to the second embodiment of the present invention is described. In the second embodiment, the functions and operations of each processing unit of the control device 30 are partially different from those of the first embodiment. In addition, the first adjustment unit of the second embodiment is the air preheater 10. The same reference numerals are attached to the same parts as those of the first embodiment and the repeated description is omitted.

[0252] (Judgment Department)

[0253] The determination unit 32 performs determination processing based on the values ​​or states indicated by the signals of various devices received from the acquisition unit 31 and various predetermined values ​​stored in advance in the storage unit 35 .

[0254] (About determination of oxygen concentration detection unit)

[0255] When receiving the oxygen concentration of the exhaust gas from the acquisition unit 31 as the state in the combustion equipment, the determination unit 32 determines whether the time average Tm of the oxygen concentration is within the prescribed first range R1 pre-stored in the storage unit 35. The time average Tm of the present embodiment is, for example, a time average of more than 30 minutes. In addition, the time average Tm may be a time average of less than 30 minutes.

[0256] When the time average Tm of the oxygen concentration is within the first range R1, the determination unit 32 determines that "the time average Tm of the oxygen concentration is within the first range R1". On the other hand, when the time average Tm of the oxygen concentration exceeds the first range R1, the determination unit 32 determines that "the time average Tm of the oxygen concentration is outside the first range R1".

[0257] Furthermore, when the determination unit 32 receives the oxygen concentration of the exhaust gas from the acquisition unit 31, it determines whether the oxygen concentration is equal to or greater than a predetermined oxygen concentration threshold value stored in advance in the storage unit 35. When the oxygen concentration is less than the oxygen concentration threshold value, the determination unit 32 determines that the oxygen concentration is low. On the other hand, when the oxygen concentration is equal to or greater than the oxygen concentration threshold value, the determination unit 32 determines that the oxygen concentration is high.

[0258] When receiving the oxygen concentration of the exhaust gas from the acquisition unit 31, the determination unit 32 temporarily stores the oxygen concentration. When receiving a new oxygen concentration from the acquisition unit 31, the determination unit 32 determines whether the newly received oxygen concentration is higher or lower than the temporarily stored oxygen concentration.

[0259] When the newly received oxygen concentration is higher than the temporarily stored oxygen concentration, the determination unit 32 determines that the oxygen concentration is “rising” and stores the time of determination in the storage unit 35. On the other hand, when the newly received oxygen concentration is lower than the temporarily stored oxygen concentration, the determination unit 32 determines that the oxygen concentration is “decreasing” and stores the time of determination in the storage unit 35.

[0260] When determining that “the oxygen concentration is rising”, the determination unit 32 checks the difference between the time of the determination and the time when “the oxygen concentration is rising” is determined after the time when “the oxygen concentration is falling” is determined last.

[0261] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2. When the time difference is less than the second duration t2, the determination unit 32 determines that "the oxygen concentration is not continuously increasing." On the other hand, when the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the oxygen concentration is continuously increasing."

[0262] When determining that “the oxygen concentration is decreasing”, the determination unit 32 checks the difference between the latest time and the time at which “the oxygen concentration is decreasing” was determined after the time at which “the oxygen concentration is increasing” was determined last.

[0263] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2. If the time difference is less than the second duration t2, the determination unit 32 determines that "the oxygen concentration is not continuously decreasing." On the other hand, if the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the oxygen concentration is continuously decreasing."

[0264] (About the judgment of the flow rate detection unit)

[0265] When receiving the flow rate of the combustion air from the acquisition unit 31, the determination unit 32 determines whether the flow rate is within the specified second range R2 pre-stored in the storage unit 35. When the flow rate of the combustion air is within the second range R2, the determination unit 32 determines that "the flow rate is within the second range R2". On the other hand, when the flow rate of the combustion air exceeds the second range R2, the determination unit 32 determines that "the flow rate is outside the second range R2".

[0266] (About the judgment of the feeder)

[0267] When receiving the advance and retreat amount of the feeder 310 from the reference position from the acquisition unit 31, the determination unit 32 determines whether the advance and retreat amount is within the third range R3 pre-stored in the storage unit 35. When the advance and retreat amount of the feeder 310 is within the third range R3, the determination unit 32 determines that "the garbage supply amount is within the third range R3". On the other hand, when the advance and retreat amount of the feeder 310 exceeds the third range R3, the determination unit 32 determines that "the garbage supply amount is outside the third range R3".

[0268] (About the determination of the exhaust gas temperature detection unit)

[0269] The determination unit 32 temporarily stores the gas temperature when receiving the gas temperature of the exhaust gas from the acquisition unit 31. The determination unit 32 temporarily stores the gas temperature when receiving a new gas temperature from the acquisition unit 31. The determination unit 32 determines whether the newly received gas temperature is higher or lower than the temporarily stored gas temperature.

[0270] When the temperature of the newly received gas is higher than the temperature of the temporarily stored gas, the determination unit 32 determines that the "gas temperature has risen" and stores the time of determination in the storage unit 35. On the other hand, when the temperature of the newly received gas is lower than the temperature of the temporarily stored gas, the determination unit 32 determines that the "gas temperature has fallen" and stores the time of determination in the storage unit 35.

[0271] When determining that “the gas temperature has risen”, the determination unit 32 checks the difference between the latest time and the time at which “the gas temperature has risen” was determined after the time at which “the gas temperature has fallen” was determined last.

[0272] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2. If the time difference is less than the second duration t2, the determination unit 32 determines that "the gas temperature is not continuously rising". On the other hand, if the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the gas temperature is continuously rising".

[0273] When determining that “the gas temperature is decreasing”, the determination unit 32 checks the difference between the latest time and the time at which “the gas temperature is decreasing” was determined after the time at which “the gas temperature is increasing” was determined last.

[0274] At this time, the determination unit 32 determines whether the difference is greater than or equal to the second duration t2. If the time difference is less than the second duration t2, the determination unit 32 determines that "the gas temperature is not continuously decreasing." On the other hand, if the time difference is greater than or equal to the second duration t2, the determination unit 32 determines that "the gas temperature is continuously decreasing."

[0275] (First control unit)

[0276] The first control unit 33 of the present embodiment controls at least one of the first forced blower 81 as the third adjustment unit and the feeder 310 as the fourth adjustment unit in addition to the configuration of the first embodiment.

[0277] (Regarding the control of the first forced blower)

[0278] When the determination unit 32 determines that "the time average Tm of the oxygen concentration is outside the first range R1", the first control unit 33 changes the amount of combustion air blown by the first forced blower 81 within the predetermined planned range Rt pre-stored in the storage unit 35. The first control unit 33 sends a signal indicating an increase or decrease in the combustion air (increase or decrease in the number of revolutions) to the first forced blower 81, thereby changing the amount of combustion air within the planned range Rt.

[0279] Specifically, when the determination unit 32 determines that the "oxygen concentration is less than the oxygen concentration threshold value", the first control unit 33 sends a signal indicating an increase in the number of revolutions to the first forced blower 81. On the other hand, when the determination unit 32 determines that the "oxygen concentration is above the oxygen concentration threshold value", the first control unit 33 sends a signal indicating an increase in the number of revolutions to the first forced blower 81. Furthermore, when the determination unit 32 determines that the "flow rate is outside the second range R2", the first control unit 33 sends a signal indicating an increase in the number of revolutions to the first forced blower 81.

[0280] (About feeder control)

[0281] When the determination unit 32 determines that the "advance and retreat amount is outside the third range R3", the first control unit 33 sends to the feeder 310 one or more of the following: a signal indicating an increase or decrease in the advance and retreat amount, a signal indicating an increase or decrease in the advance and retreat speed, and a signal indicating an increase or decrease in the interval between the start and retreat times.

[0282] (About air preheater control)

[0283] When the determination unit 32 determines that “the gas temperature continues to decrease” and “the oxygen concentration continues to increase”, the first control unit 33 transmits a signal indicating an instruction to increase the set temperature to the air preheater 10 as the first adjustment unit.

[0284] Furthermore, when the determination unit 32 determines that “the gas temperature continues to rise” and “the oxygen concentration continues to decrease”, the first control unit 33 transmits a signal indicating a setting temperature decrease instruction to the air preheater 10 .

[0285] (Control device operation)

[0286] Below, reference Figure 6 An example of the operation of the control device 30 will be described. However, the order of the processing described below is not limited to the following example, and can be appropriately changed.

[0287] The acquisition unit 31 acquires the gas temperature of the exhaust gas from the air preheater 10 (step S30). Next, the acquisition unit 31 acquires the oxygen concentration from the oxygen concentration detection unit 26 (step S31). Next, the determination unit 32 determines whether the time average Tm of the oxygen concentration exceeds the first range R1 (step S32).

[0288] When the determination unit 32 determines that the oxygen concentration is outside the first range R1 (step S32: Yes), the first control unit 33 sends a signal indicating an increase or decrease in the number of revolutions to the first forced blower 81, thereby changing the combustion air amount within the planned range Rt (step S33). When the determination unit 32 determines that the oxygen concentration is within the first range R1 (step S32: No), the process of step S30 is performed again.

[0289] Next, the determination unit 32 determines whether the flow rate of the combustion air is within the second range R2 and whether the refuse supply amount is within the third range R3 (step S34). When the determination unit 32 determines that the flow rate is within the second range R2 and the refuse supply amount is within the third range R3 (step S34: Yes), the determination unit 32 determines whether the gas temperature continues to decrease and whether the oxygen concentration continues to increase (step S35).

[0290] When the determination unit 32 determines that the flow rate is outside the second range R2 or the garbage supply amount is outside the third range R3 (step S34: No), the process of step S30 is performed again. When the determination unit 32 determines that the gas temperature continues to decrease and the oxygen concentration continues to increase (step S35: Yes), the first control unit 33 sends a signal indicating a set temperature increase instruction to the air preheater 10 as the first adjustment unit (step S36).

[0291] After the process of step S36 is completed, the process of step S30 is performed again. When the determination unit 32 determines that the gas temperature is not continuously decreasing or the oxygen concentration is not continuously increasing (step S35: No), the determination unit 32 determines whether the gas temperature is continuously increasing or the oxygen concentration is continuously decreasing (step S37).

[0292] When the determination unit 32 determines that the gas temperature continues to rise and the oxygen concentration continues to decrease (step S37: Yes), the first control unit 33 sends a signal indicating a set temperature reduction instruction to the air preheater 10 as the first adjustment unit (step S38). When the determination unit 32 determines that the gas temperature does not continue to rise or the oxygen concentration does not continue to decrease (step S37: No), the process of step S30 is performed again.

[0293] The processing from step S30 to step S38 described above is repeatedly executed during the operation phase of the combustion equipment 100 .

[0294] Therefore, when the time average oxygen concentration Tm exceeds the first range R1, even if the first forced blower 81 as the third adjustment unit is controlled, if the oxygen concentration continues to rise or fall, the first control unit 33 controls the air preheater 10 as the first adjustment unit.

[0295] (Effect)

[0296] In the control device 30 according to the second embodiment, when the oxygen concentration increases or decreases even when the first forced blower 81 is controlled by the first control unit 33 , the air preheater 10 is controlled by the first control unit 33 .

[0297] Thus, for example, even if the amount of combustion air is adjusted, when the oxygen concentration in the combustion furnace 1 is still high or low, that is, when the combustion state in the combustion furnace 1 is not good, the combustion state can be improved by adjusting the temperature of the combustion air. Therefore, the exhaust gas temperature of the combustion equipment 100 can be stabilized.

[0298] <Third embodiment>

[0299] Next, the structure of the control device 30 of the combustion equipment 100 according to the third embodiment of the present invention will be described. In the third embodiment, the combustion equipment 100 further includes an image acquisition unit 28, and the functions and operations of each processing unit of the control device 30 are partially different from those of the first embodiment. In addition, the first adjustment unit of the third embodiment is the air preheater 10. The same reference numerals are attached to the same parts as those of the first embodiment, and repeated descriptions are omitted.

[0300] (Image acquisition unit)

[0301] The image acquisition unit 28 is a visual camera that can photograph the interior of the furnace body 2, and the image acquisition unit 28 is installed on the ceiling 2a inside the furnace body 2. In the photographing result (processed image) generated by the image acquisition unit 28 photographing the interior of the furnace body 2, the area where each of the feeder 310, the drying section 200, the combustion section 201, and the post-combustion section 202 is photographed is predetermined. The image acquisition unit 28 photographs the interior of the furnace body 2 at a predetermined time interval, and sends a signal indicating the photographing result to the control device 30 via wired or wireless communication.

[0302] The light flame F is mainly photographed within the photographing range of the image acquisition unit 28. The light flame F mainly occurs in the combustion section 201, and the light flame F is mainly photographed in the upper half of the furnace image. Here, the light flame F has a burnout length at the end of one side Dal. The burnout length is a point on the stoker 4 indicating the end of the diffusion combustion of the garbage W in the combustion section 201 (the point where the generation of volatile gas ends), and is one of the indicators used in the control for achieving appropriate combustion in the combustion furnace 1.

[0303] (Acquisition Department)

[0304] The acquisition unit 31 receives signals from the above-mentioned various devices and acquires values, states, etc. indicated by the received signals from the various devices.

[0305] (Acquired from the image acquisition unit)

[0306] The acquisition unit 31 receives a signal transmitted from the image acquisition unit 28 , thereby acquiring a photographing result indicated by the signal. The acquisition unit 31 transmits the acquired photographing result to the determination unit 32 .

[0307] (Judgment Department)

[0308] The determination unit 32 performs determination processing based on the values ​​or states indicated by the signals of various devices received from the acquisition unit 31 and various predetermined values ​​stored in advance in the storage unit 35 .

[0309] (Judgment of the Image Acquisition Unit)

[0310] When receiving the image capturing result as the state in the combustion equipment from the acquisition unit 31, the determination unit 32 determines whether the burnout length is less than or equal to a burnout threshold value of a predetermined length pre-stored in the storage unit 35 based on the image capturing result. When the burnout length is greater than the burnout threshold value, the determination unit 32 determines that the combustion state is "poor". On the other hand, when the burnout length is less than or equal to the burnout threshold value, the determination unit 32 determines that the combustion state is "good".

[0311] (Control device operation)

[0312] Below, reference Figure 8 An example of the operation of the control device 30 is described. However, the order of the processing described below is not limited to the following example, and can be appropriately replaced. In this embodiment, except that there is a process of step S9 between step S3 and step S4 of the operation of the control device 30 described in the first embodiment, all are the same processing. Therefore, the description of steps S1 to S8 is omitted.

[0313] After step S3, the determination unit 32 determines whether the combustion state is good (step S9). If the determination unit 32 determines that the combustion state is good (step S9: Yes), the process proceeds to step S4. If the determination unit 32 determines that the combustion state is not good, the process of step S0 is performed again.

[0314] The processes from step S1 to step S9 are repeatedly executed during the operation phase of the combustion equipment 100 .

[0315] (Effect)

[0316] In the control device 30 according to the third embodiment, the air preheater 10 as the first adjustment unit is controlled by the first control unit 33 based on the imaging result of the image acquisition unit 28 .

[0317] Thus, the first control unit 33 performs control based on the image capturing result showing the combustion state in the combustion furnace 1, so that, for example, the operator does not need to visually check the state in the combustion furnace 1 to perform control. Therefore, it is possible to suppress the deviation in the determination of the combustion state. Therefore, it is possible to stabilize the exhaust gas temperature of the combustion equipment 100.

[0318] <Fourth embodiment>

[0319] Next, the structure of the control device 30 of the combustion equipment 100 according to the fourth embodiment of the present invention is described. In the fourth embodiment, the functions and operations of each processing unit of the control device 30 are partially different from those of the first embodiment. In addition, the first adjustment unit is the first filtrate pump 211 and the second filtrate pump 213, or the furnace water pump 222, and the second adjustment unit is the air preheater 10. The same parts as those in the first embodiment are assigned the same reference numerals and described, and duplicate descriptions are omitted.

[0320] (Control device)

[0321] like Fig. 9 As shown, the control device 30 of the present embodiment includes an acquisition unit 31 , a determination unit 32 , a first control unit 33 , a second control unit 34 , a threshold value adjustment unit 36 ​​, and a storage unit 35 .

[0322] (First control unit)

[0323] In addition to the structure of the first embodiment, the first control unit 33 of this embodiment controls at least one of the first forced blower 81 as the third adjustment unit and the feeder 310 as the fourth adjustment unit based on the detection result of the exhaust gas temperature detection unit 25 and the exhaust gas temperature threshold.

[0324] (Threshold adjustment section)

[0325] The threshold value adjustment unit 36 ​​changes the exhaust gas temperature threshold value according to the detection result of the exhaust gas temperature detection unit 25 when the first control unit 33 controls at least one of the first adjustment unit and the second adjustment unit including the first adjustment unit.

[0326] Here, the exhaust gas temperature threshold values ​​are the first gas temperature G1 , the second gas temperature G2 , the third gas temperature G3 , the fourth gas temperature G4 , the fifth gas temperature G5 , and the sixth gas temperature G6 stored in advance in the storage unit 35 described in the first embodiment.

[0327] Specifically, when the first control unit 33 controls the first adjustment unit, the threshold adjustment unit 36 ​​subtracts the predetermined temperature, i.e., the threshold adjustment amount, which is pre-stored in the storage unit 35, from the exhaust gas temperature threshold. The threshold adjustment amount in this embodiment corresponds to the supply amount of the filtrate and the furnace water calculated based on the respective rotation speeds of the first filtrate pump 211, the second filtrate pump 213, and the furnace water pump 222, for example.

[0328] The threshold adjustment amount in the present embodiment adopts a numerical value of, for example, 1° C. or more and less than 100° C. Alternatively, the threshold adjustment amount may adopt a numerical value of 100° C. or more.

[0329] (Control device operation)

[0330] Below, reference Fig.10An example of the operation of the control device 30 is described. However, the order of the processing described below is not limited to the following example, and can be appropriately changed. In this embodiment, except that there is a process of step S15 after step S12 in the operation of the control device 30 described in the first embodiment, all are the same processing. Therefore, the description of steps S1 to S14 is omitted.

[0331] After step S12, the threshold value adjustment unit 36 ​​adjusts the exhaust gas temperature threshold value by subtracting the threshold value adjustment amount from the exhaust gas temperature threshold value (first gas temperature G1, second gas temperature G2, third gas temperature G3, fourth gas temperature G4, fifth gas temperature G5, sixth gas temperature G6) (step S15). After the processing of step S15 is completed, the processing of step S10 is performed again.

[0332] The processing from step S10 to step S15 is repeatedly executed during the operation phase of the combustion equipment 100 .

[0333] Below, reference Fig.11 An example of the operation of the control device 30 is described. However, the order of the processing described below is not limited to the following example, and can be appropriately changed. In this embodiment, except that there is a process of step S28 after step S24 in the operation of the control device 30 described in the first embodiment, all are the same processing. Therefore, the description of steps S20 to S27 is omitted.

[0334] After step S24, the threshold adjustment unit 36 ​​adjusts the exhaust gas temperature threshold by subtracting the threshold adjustment amount from the exhaust gas temperature threshold (first gas temperature G1, second gas temperature G2, third gas temperature G3, fourth gas temperature G4, fifth gas temperature G5, sixth gas temperature G6) (step S28). After the processing of step S28 is completed, the processing of step S20 is performed again.

[0335] The processing from step S20 to step S28 is repeatedly executed during the operation phase of the combustion equipment 100 .

[0336] (Effect)

[0337] In the control device 30 according to the fourth embodiment, when controlling at least one of the first adjustment unit and the second adjustment unit including the first adjustment unit, the exhaust gas temperature threshold value is changed by the threshold adjustment unit 36 ​​.

[0338] Thus, when the filtrate or furnace water is supplied to the combustion furnace 1, the gas temperature of the exhaust gas decreases and the exhaust gas temperature threshold decreases. Therefore, the gas temperature in the combustion furnace 1 can be adjusted more accurately, and as a result, the exhaust gas temperature of the combustion equipment 100 can be stabilized.

[0339] (Other Implementations)

[0340] The embodiments of the present invention have been described in detail above with reference to the drawings, but the specific structure is not limited to the structure of each embodiment, and addition, omission, replacement and other changes of the structure can be made within the scope not departing from the gist of the present invention.

[0341] in addition, Fig.12 11 is a hardware configuration diagram showing the configuration of a computer 1100 according to the present embodiment. The computer 1100 includes a processor 1110 , a main memory 1120 , a storage device 1130 , and an interface 1140 .

[0342] The control device 30 is installed in the computer 1100. The operations of the processing units are stored in the storage device 1130 in the form of a program. The processor 1110 reads the program from the storage device 1130, expands it in the main memory 1120, and executes the processing according to the program. The processor 1110 reserves storage areas corresponding to the storage units 35 in the main memory 1120 according to the program.

[0343] The program can be used to implement a part of the functions that enable the computer 1100 to function. For example, the program can function by combining with other programs stored in the storage device 1130, or by combining with other programs installed in other devices. In addition to or instead of the above structure, the computer 1100 can also have a customized LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device). Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). At this time, part or all of the functions implemented by the processor 1110 can be implemented by the integrated circuit.

[0344] Examples of the storage device 1130 include a magnetic disk, a magneto-optical disk, and a semiconductor memory. The storage device 1130 may be an internal medium directly connected to the bus of the computer 1100, or an external medium connected to the computer 1100 via the interface 1140 or a communication line. Furthermore, when the program is distributed to the computer 1100 via the communication line, the computer 1100 that receives the distribution may expand the program in the main memory 1120 to execute the above-mentioned processing. In the above-mentioned embodiment, the storage device 1130 is a non-transitory tangible storage medium.

[0345] Furthermore, the program may be used to realize a part of the above-mentioned functions. Furthermore, the program may be a so-called difference file (difference program) that realizes the above-mentioned functions by combining with other programs stored in the storage device 1130 .

[0346] Furthermore, in the embodiment, although the configuration in which one end of the first filtrate line 210 is connected to the garbage pit 18 and one end of the second filtrate line 212 is connected to the ash pit 20 is described, the configuration is not limited thereto. For example, the garbage pit 18 may further include a first filtrate absorption tank connected to the garbage pit body 180 from the lower side Dvd, and the ash pit 20 may further include a second filtrate absorption tank connected to the ash pit body from the lower side Dvd. In this case, one end of the first filtrate line 210 is connected to the first filtrate absorption tank, and one end of the second filtrate line 212 is connected to the second filtrate absorption tank. Furthermore, in this case, the first liquid level sensor 18a is disposed in the first filtrate absorption tank, and the second liquid level sensor 20a is disposed in the second filtrate absorption tank.

[0347] Furthermore, in the embodiment, although the air preheater 10 is described as being arranged only in the first pipeline, the present invention is not limited to this structure. For example, the combustion furnace 1 may also be configured to further include a second air preheater arranged in the middle of the secondary air pipeline 11. In this case, the second air preheater may be controlled by the first control unit 33 as the first adjustment unit or the second adjustment unit, similarly to the air preheater 10 arranged in the primary air pipeline 9.

[0348] Furthermore, in the second embodiment, when the determination unit 32 determines that the flow rate is outside the second range R2, a signal indicating that the first control unit 33 indicates an increase in the number of revolutions is sent to the first forced blower 81, but the present invention is not limited to this structure. For example, when the determination unit 32 determines that the flow rate is outside the second range R2, the first control unit 33 may also send a signal indicating an increase in the opening degree to the primary air damper 90.

[0349] Furthermore, the first filtrate pump 211 and the second filtrate pump 213 as the first adjustment unit or the second adjustment unit do not need to be controlled simultaneously by the first control unit 33, and may be controlled independently. In this case, for example, the storage amount of the filtrate obtained by the acquisition unit 31 from the first liquid level sensor 18a and the storage amount of the filtrate obtained from the second liquid level sensor 20a may be compared, and only the filtrate pump having a larger storage amount of the filtrate may be controlled by the first control unit 33.

[0350] Furthermore, the combustion equipment 100 may further include a combustion air temperature detection unit that detects the temperature of the combustion air flowing in the primary air line 9 and sends the detection result to the control device 30. The acquisition unit 31 of the control device 30 receives the signal sent from the combustion air temperature detection unit, thereby acquiring the temperature of the combustion air indicated by the signal. The acquisition unit 31 sends the acquired combustion air temperature to the determination unit 32. At this time, in the processing of step S0 in the operation of the control device 30 described in the first embodiment, instead of the structure in which the acquisition unit 31 acquires the set temperature of the air preheater 10 from the air preheater 10, it may be a structure in which the acquisition unit 31 acquires the temperature of the combustion air from the combustion air temperature detection unit. Furthermore, at this time, the following structure may be adopted: in step S4, the determination unit 32 determines whether the temperature of the combustion air is above the first combustion temperature T1, and in step S7, the determination unit 32 determines whether the temperature of the combustion air is above the second combustion temperature T2.

[0351] Furthermore, in the embodiment, the first control unit 33 selectively controls one or more of the first adjustment unit and the second adjustment unit according to the gas temperature detected by the exhaust gas temperature detection unit 25, but the present invention is not limited to this structure. For example, the acquisition unit 31 may acquire the storage amount of the filtrate in the garbage pit 18 and the ash pit 20 as the state in the combustion device 100 through the first liquid level sensor 18a and the second liquid level sensor 20a, and make the first control unit 33 selectively control one or more of the first adjustment unit and the second adjustment unit according to the storage amount of the filtrate. For example, the determination unit 32 compares the acquired storage amount of the filtrate with a predetermined filtrate threshold value pre-stored in the storage unit 35. When the storage amount of the filtrate is greater than the filtrate threshold value, the determination unit 32 determines that "the combustion device 100 is in the first state", and when the storage amount of the filtrate is greater than the filtrate threshold value, the determination unit 32 determines that "the combustion device 100 is in the second state". When the determination unit 32 determines that "the combustion device 100 is in the first state", the control device 30 may not perform the operation starting from step S20, for example. That is, the first control unit 33 selectively controls one or more of the first filtrate pump 211 and the second filtrate pump 213 as the first adjustment unit and the air preheater 10 as the second adjustment unit. And when the determination unit 32 determines that "the combustion device 100 is in the second state", the control device 30 may not perform the operation starting from step S10, for example. That is, the first control unit 33 selectively controls one or more of the air preheater 10 as the first adjustment unit and the furnace water pump 222 as the second adjustment unit.

[0352] Furthermore, in step S33 of the operation of the control device 30 of the second embodiment, the garbage supply amount may be controlled so that the time average Tm of the oxygen concentration is within the first range R1. For example, after the processing of step S34, the first control unit 33 may perform processing to send the following signals to the feeder 310: a signal indicating an increase or decrease in the amount of advance and retreat, a signal indicating an increase or decrease in the advance and retreat speed, and a signal indicating an increase or decrease in the interval between the start times of advance and retreat.

[0353] Furthermore, in the embodiment, the oxygen concentration detection unit 26 is described as being provided in the outlet flow path 15 , but the invention is not limited to this structure. The oxygen concentration detection unit 26 may be provided in the combustion furnace 1 .

[0354] Furthermore, the configuration of the control device 30 in the combustion equipment 100 described in each embodiment is not necessarily an independent configuration, but the control device 30 may be configured by appropriately combining the components described in each embodiment.

[0355] Furthermore, in the embodiment, the combustion device 100 is set as a coal-fired combustion furnace, but is not limited to the coal-fired combustion furnace. The combustion device 100 may be, for example, a kiln, a biomass fluidized bed boiler, a sludge combustion furnace, etc. Therefore, the control device 30 may be a control device for the combustion devices such as these kilns, biomass fluidized bed boilers, sludge combustion furnaces, etc.

[0356] <Appendix>

[0357] The control device described in each embodiment can be understood, for example, as follows.

[0358] (1) The control device 30 involved in the first embodiment is a control device 30 for a combustion device 100 having a combustion furnace 1 for burning a calcined object W, and comprises: a first control unit 33 that can control a first adjustment unit for adjusting the gas temperature of the exhaust gas in the combustion device 100 and a second adjustment unit for adjusting the gas temperature in a method different from that of the first adjustment unit, and selectively controls one or more of the first adjustment unit and the second adjustment unit according to the state in the combustion device 100; and a second control unit 34 that controls a denitrification agent supply unit to supply a denitrification agent to the exhaust gas in the combustion device 100 after the first control unit 33 selectively controls one or more of the first adjustment unit and the second adjustment unit.

[0359] Therefore, compared with the structure of the control device 30 having only one adjustment unit as a mechanism for adjusting the gas temperature, the gas temperature can be selectively controlled according to the state in the combustion equipment 100, thereby suppressing the deterioration of the combustion state in the combustion equipment 100.

[0360] (2) The control device 30 involved in the second embodiment is the control device 30 of (1), which can be as follows: the combustion equipment 100 also has an exhaust gas temperature detection unit 25 for detecting the gas temperature of the exhaust gas, the first adjustment unit is an adjustment unit for adjusting any one of the amount of filtrate of the exhaust gas recovered from the combustion equipment 100 and supplied to the combustion furnace 1, the temperature of the combustion air supplied to the combustion furnace 1, or the amount of water spray in the furnace supplied to the exhaust gas, the second adjustment unit is an adjustment unit for adjusting any other of the amount of the filtrate, the temperature of the combustion air, or the amount of water spray in the furnace, and the first control unit 33 selectively controls one or more of the first adjustment unit and the second adjustment unit based on at least the detection result of the exhaust gas temperature detection unit 25 as the state in the combustion equipment 100.

[0361] Thus, since the first adjustment unit and the second adjustment unit are selectively controlled according to the gas temperature of the exhaust gas, it is possible to further suppress deterioration of the combustion state in the combustion equipment 100 .

[0362] (3) The control device 30 involved in the third embodiment is the control device 30 of (1) or (2), which can be configured as follows: the first adjustment unit is an adjustment unit for adjusting the temperature of the combustion air supplied to the combustion furnace 1, the first control unit 33 controls at least one of the third adjustment unit and the fourth adjustment unit in such a manner that the oxygen concentration in the combustion furnace 1 or on the downstream side of the combustion furnace 1 becomes within a prescribed range, and when, as a state in the combustion equipment 100, the oxygen concentration still deviates from a target value by more than a certain amount even if at least one of the third adjustment unit and the fourth adjustment unit is controlled, the first adjustment unit is controlled, the third adjustment unit controls the amount of the combustion air, and the fourth adjustment unit adjusts the supply amount of the calcined object W.

[0363] Thus, even when the combustion state in the combustion furnace 1 is not good, the combustion state can be improved by adjusting the temperature of the combustion air.

[0364] (4) The control device 30 involved in the fourth embodiment is any one of the control devices 30 (1) to (3), which can be configured as follows: the combustion equipment 100 further includes an image acquisition unit 28 capable of photographing the combustion state of the calcined material W in the combustion furnace 1; the first adjustment unit is an adjustment unit for adjusting the temperature of the combustion air supplied to the combustion furnace 1; and the first control unit 33 determines whether to control the first adjustment unit or its control amount based on at least the photographing result of the image acquisition unit 28 as the state in the combustion equipment 100.

[0365] Thus, the first control unit 33 performs control based on the imaging result indicating the combustion state in the combustion furnace 1 , and therefore it is not necessary for the operator to visually check the state in the combustion furnace 1 to perform control.

[0366] (5) The control device 30 involved in the fifth embodiment is the control device 30 of (3) or (4), and it can be configured as follows: it further includes a threshold value adjustment unit 36 ​​capable of adjusting a threshold value regarding the gas temperature, i.e., a waste gas temperature threshold value; the first adjustment unit is an adjustment unit that adjusts any one of the amount of filtrate of the waste gas recovered from the combustion equipment 100 and supplied to the combustion furnace 1, or the amount of in-furnace water spray supplied to the waste gas; the second adjustment unit is an adjustment unit that adjusts the temperature of the combustion air supplied to the combustion furnace 1; the first control unit 33 controls at least one of a third adjustment unit that controls the amount of the combustion air and a fourth adjustment unit that adjusts the supply amount of the calcined material W according to the gas temperature and the waste gas temperature threshold value; and the threshold value adjustment unit changes the waste gas temperature threshold value when the first control unit controls the first adjustment unit and the second adjustment unit, including at least one of the first adjustment unit.

[0367] Thus, when the filtrate or furnace water is supplied into the combustion furnace 1, the gas temperature of the exhaust gas is lowered and the exhaust gas temperature threshold is decreased. Therefore, the gas temperature in the combustion furnace 1 can be adjusted more accurately.

[0368] Industrial Applicability

[0369] According to the present invention, it is possible to provide a control device capable of stabilizing the exhaust gas temperature of a combustion plant.

[0370] Explanation of symbols

[0371] 1-combustion furnace, 2-furnace body, 2a-ceiling, 3-fuel supply mechanism, 4-stoker, 4a-stoker surface, 5-wind box, 6-exhaust channel, 7-furnace, 8-forced blower, 9-primary air pipeline, 10-air preheater, 11-secondary air pipeline, 12-exhaust heat recovery boiler, 13-cooling tower, 14-dust collecting device, 15-export flow path, 16-chimney, 17-induced draft fan, 18-garbage pit, 18a-first liquid level sensor, 19-ash pressing device, 20-ash pit, 20a-second liquid level sensor, 21-filtrate supply unit, 22-furnace water supply unit, 23-exhaust gas recirculation pipeline, 24-desnitrification material supply unit, 25-exhaust gas temperature detection unit, 26 - oxygen concentration detection unit, 27 - flow detection unit, 28 - image acquisition unit, 30 - control device, 31 - acquisition unit, 32 - determination unit, 33 - first control unit, 34 - second control unit, 35 - storage unit, 36 - threshold value adjustment unit, 81 - first forced blower, 82 - second forced blower, 90 - first air shock absorber, 100 - combustion equipment, 110 - second air shock absorber, 180 - garbage pit body, 181 - platform, 182 - crane, 183 - track, 184 - main beam, 185 - trolley, 186 - wire rope, 187 - winch, 188 - grab hook, 189 - crane control device, 190 - extrusion device body, 200 - drying section, 20 1-combustion section, 202-post-combustion section, 210-first filtrate pipeline, 211-first filtrate pump, 212-second filtrate pipeline, 213-second filtrate pump, 220-water tank, 221-water pipeline in furnace, 222-water pump in furnace, 240-denitrification material supply source, 241-denitrification material supply pipeline, 300-hopper, 301-inlet, 302-outlet, 302a-ground, 310-feeder, 311-upper surface, 312-extrusion surface, 1100-computer, 1110-processor, 1120-main memory, 1130-storage device, 1140-interface, Da-transport direction, Dar-other side, Dal-one side, Dv-up and down direction , Dvd-lower side, Dvu-upper side, Dw-furnace width direction, F-flame, G1-1st gas temperature, G2-2nd gas temperature, G3-3rd gas temperature, G4-4th gas temperature, G5-5th gas temperature, G6-6th gas temperature, P1-1st ratio threshold, P2-2nd ratio threshold, R-storage space, R1-1st range, R2-2nd range, R3-3rd range, Rt-planned range, T-garbage collection truck, T1-1st combustion temperature, t1-1st duration, T2-2nd combustion temperature, t2-2nd duration, Ta-adjustment temperature, Tm-time average, tu-unit time, V-processing space, W-calcined material, garbage.

Claims

1. A control device for a combustion facility having a combustion furnace for burning a material to be calcined, comprising: a first control unit that controls a first adjustment unit that adjusts the gas temperature of the exhaust gas in the combustion device and a second adjustment unit that adjusts the gas temperature in a method different from that of the first adjustment unit, and selectively controls one or more of the first adjustment unit and the second adjustment unit according to a state in the combustion device; and A second control unit controls a denitrification agent supply unit to supply a denitrification agent to the exhaust gas in the combustion equipment after the first control unit selectively controls at least one of the first adjustment unit and the second adjustment unit.

2. The control device according to claim 1, wherein: The combustion equipment further includes an exhaust gas temperature detection unit for detecting the gas temperature of the exhaust gas. The first adjustment unit is an adjustment unit that adjusts any one of the amount of the filtrate of the exhaust gas recovered from the combustion equipment and supplied to the combustion furnace, the temperature of the combustion air supplied to the combustion furnace, or the amount of the furnace water spray supplied to the exhaust gas. The second adjustment unit is an adjustment unit that adjusts any other one of the amount of the filtrate, the temperature of the combustion air, or the amount of the water spray in the furnace. The first control unit selectively controls at least one of the first adjustment unit and the second adjustment unit based on at least a detection result of the exhaust gas temperature detection unit as a state in the combustion equipment.

3. The control device according to claim 1 or 2, wherein: The first adjustment unit is an adjustment unit for adjusting the temperature of the combustion air supplied to the combustion furnace. The first control unit controls at least one of the third adjustment unit and the fourth adjustment unit in such a manner that the oxygen concentration in the combustion furnace or on the downstream side of the combustion furnace is within a specified range, and when, as a state in the combustion equipment, the oxygen concentration still deviates from a target value by more than a certain amount even if at least one of the third adjustment unit and the fourth adjustment unit is controlled, the first adjustment unit is controlled, the third adjustment unit controls the amount of the combustion air, and the fourth adjustment unit adjusts the supply amount of the calcined material.

4. The control device according to claim 1 or 2, wherein: The combustion equipment further includes an image acquisition unit capable of capturing a combustion state of the object to be calcined in the combustion furnace. The first adjustment unit is an adjustment unit for adjusting the temperature of the combustion air supplied to the combustion furnace. The first control unit determines whether to control the first adjustment unit or a control amount thereof based on at least the imaging result of the image acquisition unit as the state inside the combustion equipment.

5. The control device according to claim 1 or 2, further comprising a threshold value adjustment unit capable of adjusting a threshold value regarding the gas temperature, that is, an exhaust gas temperature threshold value, The first adjustment unit is an adjustment unit that adjusts either the amount of the filtrate of the exhaust gas recovered from the combustion equipment and supplied to the combustion furnace, or the amount of the furnace water spray supplied to the exhaust gas. The second adjustment unit is an adjustment unit for adjusting the temperature of the combustion air supplied to the combustion furnace. The first control unit controls at least one of the third adjustment unit and the fourth adjustment unit according to the gas temperature and the exhaust gas temperature threshold, the third adjustment unit controls the amount of the combustion air, and the fourth adjustment unit adjusts the supply amount of the calcined material. The threshold value adjustment unit changes the exhaust gas temperature threshold value when the first control unit controls at least one of the first adjustment unit and the second adjustment unit including the first adjustment unit.

Images