Cooling control device, cooling control method, program and incineration facility

Abstract

To provide a cooling control device capable of preventing a problem caused by a temperature of exhaust gas in an apparatus to which the exhaust gas discharged from a fluid type incinerator flows in, a cooling control method, a program and an incineration facility.SOLUTION: A cooling control device includes: a temperature information acquisition section that acquires temperature information indicating a temperature at an inlet of an apparatus to which exhaust gas discharged from a fluid type incinerator flows in; a control target selection section that selects a water supply device to be controlled from a plurality of water supply devices provided on the upper side of a free board part of the fluid type incinerator on the basis of the acquired temperature information; and a flow rate control section that controls a flow rate of cooling water to be supplied from the water supply device selected as the control target to inside of the incinerator on the basis of the acquired temperature information.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a cooling control device, a cooling control method, a program, and an incineration facility. [Background technology]

[0002] Conventionally, incineration facilities including incinerators emit greenhouse gases that affect global warming during incineration, and therefore there is a demand for reducing the amount of greenhouse gas emissions. For example, in a fluidized incinerator, exhaust gas is generated during incineration, and the exhaust gas contains nitrous oxide (N2O), a type of greenhouse gas. For this reason, in fluidized incinerators, in consideration of global warming, there is a demand for reducing the amount of nitrous oxide emissions contained in the exhaust gas generated during incineration. In fluidized incinerators, incineration operation is performed at high temperatures to reduce the amount of nitrous oxide emissions. In addition to increasing the temperature of the entire furnace, there are incineration operation methods that generate high-temperature areas in the middle and lower parts of the freeboard, for example, in combustion under pressure or in combustion in which some combustion air is supplied to the freeboard section. However, incineration operation at high temperatures causes the exhaust gas generated in the fluidized incinerator to flow into equipment such as an air preheater while still at a high temperature. This causes problems such as thermal damage to the equipment into which the exhaust gas flows, adhesion due to melting of incineration ash, and blockage.

[0003] Therefore, in order to prevent problems that could occur in the equipment due to the inflow of high-temperature exhaust gas during operation of a fluidized bed incinerator, cooling is carried out using a water-cooling device to keep the temperature inside the furnace and the exhaust gas temperature at the furnace outlet below allowable temperatures. For example, Patent Document 1 listed below discloses a technology in which a water-cooled nozzle is provided at the top of the freeboard section of a fluidized incinerator, the inlet exhaust gas temperature of an air preheater, into which the exhaust gas from the fluidized incinerator flows, is measured, and the water-cooled nozzle provided at the top of the freeboard section is controlled so that the measured inlet exhaust gas temperature becomes a predetermined temperature. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4173791 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technology of Patent Document 1, water sprayed from a water cooling device installed at the top of the freeboard section may drip down to the bottom of the freeboard section. This creates a local low-temperature area in the freeboard section. The low-temperature area inhibits the decomposition of nitrous oxide generated in the sand layer and the bottom of the freeboard section in the high-temperature area in the middle and upper parts of the freeboard section. For this reason, the technology of Patent Document 1 may increase the amount of nitrous oxide emissions. On the other hand, since local high-temperature areas are also created, adhesion or blockage may occur due to melting of incineration ash accompanying the exhaust gas. In addition, the occurrence of local low-temperature and high-temperature areas causes the temperature of the freeboard section to become uneven, resulting in temperature unevenness in the exhaust gas. If the exhaust gas discharged from a fluidized bed incinerator flows into other equipment while maintaining uneven temperatures, problems such as thermal damage, including thermal cracks, can occur in the tube sheet of the equipment into which the exhaust gas flows.

[0006] In view of the above-mentioned problems, an object of the present invention is to provide a cooling control device, a cooling control method, a program, and incineration equipment that can prevent problems caused by the temperature of exhaust gas in equipment into which exhaust gas discharged from a fluidized incinerator flows. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a cooling control device according to one embodiment of the present invention includes a temperature information acquisition unit that acquires temperature information indicating the temperature at the inlet of an equipment into which exhaust gas discharged from a fluidized incinerator flows, a control target selection unit that selects a water supply device to be controlled from among a plurality of water supply devices provided above the freeboard section of the fluidized incinerator based on the acquired temperature information, and a flow rate control unit that controls the flow rate of cooling water supplied from the water supply device selected as the control target into the furnace based on the acquired temperature information.

[0008] A cooling control method according to one embodiment of the present invention includes a temperature information acquisition process in which a computer acquires temperature information indicating the temperature at an inlet of an equipment into which exhaust gas discharged from a fluidized incinerator flows, a control target selection process in which, based on the acquired temperature information, a water supply device to be controlled is selected from a plurality of water supply devices provided above a freeboard section of the fluidized incinerator, and a flow rate control process in which, based on the acquired temperature information, a flow rate of cooling water supplied from the water supply device selected as the control target into the furnace is controlled.

[0009] A program according to one embodiment of the present invention causes a computer to function as: a temperature information acquisition means for acquiring temperature information indicating the temperature at the inlet of an equipment into which exhaust gas discharged from a fluidized incinerator flows; a control target selection means for selecting a water supply device to be controlled from among a plurality of water supply devices provided above the freeboard section of the fluidized incinerator based on the acquired temperature information; and a flow rate control means for controlling the flow rate of cooling water supplied into the furnace from the water supply device selected as the control target based on the acquired temperature information. Effect of the Invention

[0010] According to the present invention, it is possible to prevent problems caused by the temperature of exhaust gas in equipment into which exhaust gas discharged from a fluidized incinerator flows. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram showing a schematic configuration of an incineration facility according to a first embodiment. [Diagram 2] 3 is a diagram showing an example of an input / output relationship in a region to which cooling water is supplied, a region of a tube sheet portion, and a cooling control device according to the first embodiment. FIG. [Diagram 3] FIG. 4 is a diagram showing an example of correspondence information according to the first embodiment. [Figure 4] FIG. 2 is a diagram showing an example of an overall temperature distribution obtained by a thermal fluid analysis of the incineration facility according to the first embodiment. [Diagram 5] FIG. 3 is a diagram showing an example of the temperature distribution of a tube sheet portion obtained by a thermal fluid analysis of the incineration facility according to the first embodiment. [Figure 6] 2 is a diagram illustrating an example of a functional configuration of a cooling control device according to the first embodiment. FIG. [Figure 7] FIG. 2 is a flow chart illustrating an example of a process flow in the cooling control device according to the first embodiment. [Figure 8] FIG. 4 is a diagram illustrating an example of a hardware configuration of a cooling control device according to a modified example of the first embodiment. [Figure 9] 13 is a diagram showing an example of an input / output relationship in a region to which cooling water is supplied, a region of a tube sheet portion, and a cooling control device according to a second embodiment. FIG. [Figure 10] FIG. 11 is a diagram illustrating an example of a functional configuration of a cooling control device according to a second embodiment. [Figure 11] FIG. 11 is a flow chart illustrating an example of a process flow in a cooling control device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, an X-axis, a Y-axis, and a Z-axis that are mutually orthogonal are shown as necessary. On each axis, the direction in which the arrow extends is called the "positive direction," and the direction opposite to the positive direction is called the "negative direction."

[0013] <<1. First embodiment>> The first embodiment will be described with reference to FIGS.

[0014] <1-1. Outline of incineration facility> The schematic configuration of the incineration facility according to the first embodiment will be described with reference to Figures 1 to 5. Figure 1 is a diagram showing the schematic configuration of the incineration facility according to the first embodiment. The incineration facility 1 shown in Fig. 1 is a facility installed in a water treatment plant that treats sewage such as domestic wastewater. In the water treatment plant, sludge is separated from sewage such as domestic wastewater. The separated sludge is further concentrated and dehydrated to become dehydrated sludge. The incineration facility 1 incinerates, for example, the dehydrated sludge as the incineration target. As shown in FIG. 1, the incineration facility 1 includes a fluidized incinerator 10, an air preheater 20, and a cooling control device 100, as well as a dust collector (not shown) and an exhaust gas treatment device (not shown). The air preheater 20 is an example of a device into which the exhaust gas discharged from the fluidized incinerator 10 flows. The fluidized incinerator 10 and the air preheater 20 are connected by a duct 30. The dust collector is a device into which the exhaust gas discharged from the air preheater 20 flows and which separates the incineration ash in the exhaust gas. The exhaust gas treatment device is a device into which the exhaust gas discharged from the dust collector flows and which treats sulfur oxides and the like in the exhaust gas.

[0015] (1) Fluidized Bed Incinerator 10 As shown in FIG. 1, the fluidized incinerator 10 includes a sand layer section 11 and a freeboard section 12. The fluidized incinerator 10 incinerates the incineration target 2 (e.g., dewatered sludge) supplied from a previous stage device (e.g., a dehydrator) by combustion under pressure or by supplying a portion of combustion air to the freeboard section 12. The incineration target 2 supplied from the previous stage device is burned in the sand layer section 11. When the incineration target 2 is burned in the sand layer section 11, exhaust gas 3 is generated. The exhaust gas 3 is further burned in the freeboard section 12 and discharged from the fluidized incinerator 10. The freeboard section 12 is a portion above the sand layer section 11 in the fluidized incinerator 10. In the first embodiment, the portion above the sand layer section 11 in the fluidized incinerator 10 (i.e., the freeboard section 12) is divided into three parts, which are the lower section 12A, the middle section 12B, and the upper section 12C of the freeboard section 12. Exhaust gas 3 discharged from the fluidized incinerator 10 flows into the air preheater 20 through a duct 30.

[0016] The exhaust gas 3 generated by incinerating the incineration target 2 in the fluidized incinerator 10 contains nitrous oxide (N2O). Since the nitrous oxide is a greenhouse gas that affects global warming, it is required to reduce its emission. Therefore, in the fluidized incinerator 10, for example, a high-temperature incineration operation is performed in order to reduce the emission of nitrous oxide. Conventionally, in a general fluidized incinerator, the upper part of the freeboard part is set as a high-temperature area, and the thermal decomposition of nitrous oxide is often performed in the upper part of the freeboard part. For this reason, if cooling water is supplied to the upper part of the freeboard part by the conventional method, the temperature of the area where the thermal decomposition of nitrous oxide is most performed is lowered, and the reduction of nitrous oxide may not be achieved. Therefore, in the high-temperature incineration operation, it is important to maintain at least one of the lower part 12A and the middle part 12B of the freeboard part 12 at a high temperature. Therefore, in the fluidized incinerator 10 in the first embodiment, an incinerator capable of incinerating at least one of the lower portion 12A and the middle portion 12B of the freeboard portion 12 in a high temperature region is used. For example, in the case of a fluidized incinerator 10 capable of pressurized combustion or combustion in which a part of combustion air is supplied to the freeboard portion 12 (multilayer combustion), operation in which at least one of the lower portion 12A and the middle portion 12B of the freeboard portion 12 in a high temperature region is possible. Nitrous oxide generated in the sand layer portion 11 or the lower portion 12A of the freeboard portion 12 by high temperature incineration operation is decomposed in the high temperature region of the lower portion 12A or the middle portion 12B of the freeboard portion 12. As a result, even if cooling water is supplied to the upper portion 12C of the freeboard portion 12, there is a low risk of lowering the temperature of the high temperature region of the lower portion 12A or the middle portion 12B of the freeboard portion 12 where thermal decomposition of nitrous oxide is most likely to occur, so that it is possible to prevent the reduction of nitrous oxide emissions in the fluidized incinerator 10 from being hindered. In high-temperature incineration operation, for example, the high-temperature region is operated to be about 850° C. to 950° C. In this case, it is preferable to operate so that at least one of the lower portion 12A and the middle portion 12B of the freeboard portion 12 has the highest temperature.

[0017] On the other hand, the high-temperature incineration operation causes the temperature of the exhaust gas 3 generated in the fluidized incinerator 10 to become high. If the exhaust gas 3 flows into equipment such as the air preheater 20 while still at a high temperature, problems such as heat damage, adhesion and blockage due to melting of incineration ash may occur in the equipment into which the exhaust gas 3 flows. Therefore, a water spray 40 (an example of a water supply device) for cooling the exhaust gas 3 is provided on the upper part 12C of the freeboard part 12. The water spray 40 adjusts the temperature of the exhaust gas 3 by supplying cooling water 4 to the exhaust gas 3. As shown in FIG. 1, the water spray 40 is provided on the canopy part of the freeboard part 12. If the water spray 40 is provided on the side part of the freeboard part 12 (for example, a part other than the canopy part of the upper part 12C), the cooling water 4 may not be supplied to the center of the furnace when the flow rate of the supplied cooling water 4 is low. In addition, if the piping is extended from the side part of the freeboard part 12 to supply the cooling water 4 to the center of the furnace, the amount of cooling air to prevent the nozzle of the water spray 40 from being burned by combustion becomes excessive. Therefore, it is preferable that the water spray 40 is provided on the canopy part of the freeboard part 12 of the fluidized bed incinerator 10. By providing the water spray 40 on the canopy of the freeboard section 12, the cooling water 4 can be supplied to the center of the furnace without supplying an excessive amount of cooling air to prevent the nozzle of the water spray 40 from burning, even when the flow rate of the supplied cooling water 4 is low, and the exhaust gas can be cooled reliably. In addition, there is no need to supply a large amount of cooling water 4, and the risk of the cooling water 4 dripping onto the lower part 12A of the freeboard section 12 is reduced, preventing the occurrence of a low temperature area. Furthermore, even in the case of high-temperature incineration operation, the high-temperature area of ​​the lower part 12A or middle part 12B of the freeboard section 12 is prevented from being cooled, and an increase in nitrous oxide can be suppressed. The flow rate of the cooling water 4 supplied from the water spray 40 is adjusted by a valve 50. The valve 50 is controlled by a cooling control device 100. The cooling water 4 may be sprayed from the water spray 40, for example. The temperature of the exhaust gas 3 is adjusted by increasing the flow rate of the cooling water supplied from the water spray 40, thereby decreasing the flow rate of the cooling water, thereby decreasing the flow rate of the cooling water. In this way, the fluidized bed incinerator 10 adjusts the temperature of the exhaust gas 3 by using the water spray 40 at the upper portion 12C of the freeboard section 12, thereby reducing the number of high-temperature or low-temperature areas that are locally generated in the exhaust gas 3, and preventing problems such as heat damage and adhesion or blockage due to melting of incineration ash in equipment into which the exhaust gas 3 flows. Furthermore, in the first embodiment, the cooling water 4 is supplied to selected locations where it is required, thereby making it possible to suppress a sudden decrease in temperature in the freeboard section 12 and to suppress an increase in nitrous oxide.

[0018] For example, when a large amount of cooling water 4 is supplied from the water spray 40 provided on the upper part 12C of the freeboard part 12, the supplied cooling water 4 may drip onto the lower part 12A of the freeboard part 12. This may result in a localized low temperature area in the lower part 12A of the freeboard part 12. If this low temperature area occurs so as to extend in the vertical direction, it may inhibit the decomposition of nitrous oxide generated in the lower part 12A of the freeboard part 12 in the middle part 12B or upper part 12C of the freeboard part 12. This increases the amount of nitrous oxide emissions, inhibiting the reduction of nitrous oxide emissions. On the other hand, the occurrence of localized low-temperature regions also leads to the occurrence of localized high-temperature regions, which may cause problems such as adhesion or blockage due to melting of incineration ash accompanying the exhaust gas 3. In addition, the temperature of the freeboard section 12 becomes non-uniform, causing temperature unevenness in the exhaust gas 3. If the exhaust gas 3 with temperature unevenness flows into the equipment, the temperature difference will cause thermal damage such as thermal cracking at the inlet of the equipment. Therefore, a plurality of water sprays 40 are provided on the upper portion 12C of the freeboard portion 12. By dispersing the cooling water 4 from the plurality of water sprays 40 and supplying it, the flow rate of the cooling water 4 supplied from one water spray 40 can be reduced. This prevents the cooling water 4 from dripping onto the lower portion 12A of the freeboard portion 12 and the generation of low temperature areas. Therefore, it is possible to prevent the inhibition of the reduction of the emission amount of nitrous oxide caused by the generation of low temperature areas and the generation of high temperature areas. Furthermore, it is possible to prevent the generation of temperature differences in the exhaust gas 3 due to local low temperature areas and high temperature areas, and it is also possible to prevent the occurrence of problems caused by the temperature of the exhaust gas in equipment into which the exhaust gas 3 discharged from the fluidized incinerator 10 flows.

[0019] (2) Air preheater 20 The air preheater 20 exchanges heat between the exhaust gas 3 generated by burning the incineration target 2 in the fluidized incinerator 10 and the fluidizing air supplied to the fluidized incinerator 10, and heats the fluidizing air to a high temperature. The exhaust gas 3 from which the fluidizing air has been heated in the air preheater 20 is supplied to, for example, a dust collector (not shown), where dust and the like contained in the exhaust gas 3 is removed. A thermometer 60 for measuring the temperature of the inlet portion is provided at the inlet portion of the air preheater 20. The inlet portion is, for example, the tube sheet portion 21 of the air preheater 20. The thermometer 60 measures the temperature at the tube sheet portion 21 into which the exhaust gas discharged from the fluidized incinerator 10 flows. The tube sheet portion 21 is provided with a plurality of thermometers 60. This makes it possible to detect temperature unevenness at the tube sheet portion 21 from the plurality of measured temperatures. Information indicating the temperature of the tube sheet portion 21 (hereinafter also referred to as "temperature information") is transmitted from the thermometer 60 to the cooling control device 100.

[0020] (3) Cooling control device 100 The cooling control device 100 is a device that controls cooling in the fluidized incinerator 10. The cooling control device 100 is configured, for example, with a PC (Personal Computer), one or more servers (for example, cloud servers), and the like.

[0021] The cooling control device 100 controls the cooling of the exhaust gas 3 discharged from the fluidized incinerator 10 (or the inside of the furnace) by controlling the flow rate of the cooling water 4 supplied from the water spray 40. For example, the cooling control device 100 selects a water spray 40 to be controlled from among the multiple water sprays 40 based on temperature information transmitted from a thermometer 60, and controls the flow rate of the cooling water 4 supplied from the water spray 40 selected as the control target to the inside of the furnace. The cooling control device 100 controls the flow rate of the cooling water 4 by transmitting a control signal to a valve 50 corresponding to the water spray 40 selected as the control target. The control by the cooling control device 100 is performed, for example, by PID (Proportional Integral Differential) control.

[0022] When the temperature information indicates that temperature adjustment is required in the tube sheet section 21 of the air preheater 20, the cooling control device 100 selects as the control target the water spray 40 that supplies cooling water 4 to the area in the furnace corresponding to the area of ​​the tube sheet section 21 where temperature adjustment is required. The cooling control device 100 determines whether or not temperature adjustment is necessary based on, for example, whether or not there is an area in the tube sheet portion 21 where the maximum temperature is equal to or higher than a predetermined temperature, or whether or not there is an area where the temperature difference between the maximum temperature and the minimum temperature is equal to or higher than a predetermined temperature difference. When it is determined that temperature adjustment is necessary, the cooling control device 100 selects an object to be controlled based on, for example, the correspondence information.

[0023] The correspondence information is information showing various correspondences in the incineration equipment 1. The various correspondences are, for example, the correspondences in the fluidized incinerator 10, the correspondences in the air preheater 20, and the correspondences between the fluidized incinerator 10 and the air preheater 20. The correspondences in the fluidized incinerator 10 show, for example, the correspondences between the area to which the cooling water 4 is supplied, the water sprays 40 that supply the cooling water 4 to each area, and the valves 50 that control the flow rate of the cooling water 4 supplied from each water spray 40. The correspondences in the air preheater 20 show, for example, the correspondences between the area of ​​the tube sheet section 21 and the thermometer 60 that measures the temperature in the area of ​​the tube sheet section 21. The correspondences in the fluidized incinerator 10 and the air preheater 20 show, for example, the correspondences between the area to which the water sprays 40 supply the cooling water 4 and the area of ​​the tube sheet section 21 whose temperature changes as a result of the cooling water 4 being supplied to that area. Therefore, the cooling control device 100 can determine, based on the correspondence information, the area in the furnace that corresponds to the area of ​​the tube sheet portion 21 that requires temperature adjustment.

[0024] Here, referring to Fig. 2, the correspondence between the region to which the cooling water 4 is supplied, the region of the tube sheet portion 21, the cooling control device 100, and the input / output will be described. Fig. 2 is a diagram showing an example of the input / output relationship between the region to which the cooling water 4 is supplied, the region of the tube sheet portion 21, and the cooling control device 100 according to the first embodiment. The fluidized bed incinerator 10 and the air preheater 20 shown in Fig. 2 are shown as viewed from the positive direction of the Y axis. For convenience of explanation, the duct 30 is omitted in Fig. 2.

[0025] The region to which the cooling water 4 is supplied is the region of the upper part 12C of the freeboard section 12. Region 13 shown in Fig. 2 is the region to which the cooling water 4 is supplied, and is shown as a cross-sectional region in the vertical direction (Y-axis direction) of the fluidized incinerator 10. In the example shown in Fig. 2, region 13 is divided into four regions: region 13A, region 13B, region 13C, and region 13D. The upper part 12C of the freeboard section 12 is provided with water sprays 40A which supply cooling water 4 to region 13A, water sprays 40B which supply cooling water 4 to region 13B, water sprays 40C which supply cooling water 4 to region 13C, and water sprays 40D which supply cooling water 4 to region 13D. Also provided are a valve 50A for controlling the flow rate of the cooling water 4 supplied from the water spray 40A, a valve 50B for controlling the flow rate of the cooling water 4 supplied from the water spray 40B, a valve 50C for controlling the flow rate of the cooling water 4 supplied from the water spray 40C, and a valve 50D for controlling the flow rate of the cooling water 4 supplied from the water spray 40D. Each valve 50 is connected to the cooling control device 100 so as to be able to receive a control signal for controlling the flow rate of the cooling water 4 from the cooling control device 100.

[0026] 2 is a region of the tube sheet portion 21, and is shown as a cross-sectional region in the vertical direction (Y-axis direction) of the air preheater 20. In the example shown in Fig. 2, the region 22 is divided into four regions: a region 22A', a region 22B', a region 22C', and a region 22D'. The air preheater 20 is provided with a thermometer 60A' for measuring the temperature of the region 22A', a thermometer 60B' for measuring the temperature of the region 22B', a thermometer 60C' for measuring the temperature of the region 22C', and a thermometer 60D' for measuring the temperature of the region 22D'. Each thermometer 60 is connected to the cooling control device 100 so as to be able to transmit temperature information indicating the measured temperature of the region of the tube sheet portion 21 to the cooling control device 100.

[0027] The cooling control device 100 determines which of the regions 22A' to 22D' require temperature adjustment based on temperature information input from the thermometers 60A' to 60D'. If there is an area requiring temperature adjustment, the cooling control device 100 determines which of the regions 13A to 13D corresponds to the area determined to require temperature adjustment based on the correspondence information. After the determination, the cooling control device 100 selects, as a control target, one of the water sprays 40A to 40D that is provided to supply the cooling water 4 to the determined area. After the selection, the cooling control device 100 transmits a control signal to one of the valves 50A to 50D that is provided to control the flow rate of the cooling water 4 supplied from the selected water spray 40.

[0028] Here, the correspondence information will be described with reference to Fig. 3. Fig. 3 is a diagram showing an example of the correspondence information according to the first embodiment.

[0029] Figure 3 shows, as an example of the corresponding relationships in the fluidized incinerator 10, that a water spray 40A supplies cooling water 4 to area 13A at a flow rate controlled by a valve 50A, that a water spray 40B supplies cooling water 4 to area 13B at a flow rate controlled by a valve 50B, that a water spray 40C supplies cooling water 4 to area 13C at a flow rate controlled by a valve 50C, and that a water spray 40D supplies cooling water 4 to area 13D at a flow rate controlled by a valve 50D. Additionally, as an example of the correspondence in air preheater 20, it is shown that thermometer 60A' measures the temperature of region 22A', thermometer 60B' measures the temperature of region 22B', thermometer 60C' measures the temperature of region 22C', and thermometer 60D' measures the temperature of region 22D'. Furthermore, as an example of the correspondence between the fluidized incinerator 10 and the air preheater 20, it is shown that when cooling water 4 is supplied to area 13A, the temperature of area 22B' changes, when cooling water 4 is supplied to area 13B, the temperature of area 22D' changes, when cooling water 4 is supplied to area 13C, the temperature of area 22A' changes, and when cooling water 4 is supplied to area 13D, the temperature of area 22C' changes. This correspondence information is information that is prepared in advance based on the results of a thermal fluid analysis of the incineration facility 1.

[0030] Here, an example of a thermal fluid analysis of the incineration facility 1 will be described with reference to FIGS.

[0031] Fig. 4 is a diagram showing an example of the overall temperature distribution obtained by thermal fluid analysis of the incineration facility 1 according to the first embodiment. Fig. 4 shows the incineration facility 1 shown in Fig. 1 as viewed from the negative direction of the Z axis.

[0032] As shown in Fig. 4, by performing a thermal fluid analysis on the incineration facility 1, it is possible to obtain the temperature distribution of the entire incineration facility 1 when the exhaust gas 3 discharged from the fluidized incinerator 10 flows into the air preheater 20 through the duct 30 as an analysis result. From the example shown in Fig. 4, it can be seen that the temperature inside the fluidized incinerator 10 is about 920°C, and the temperature of the tube plate portion 21 of the air preheater 20 is about 850°C. Similarly, it is also possible to obtain changes in temperature distribution throughout the incineration facility 1 when the flow rate of the cooling water 4 supplied from the multiple water sprays 40 is adjusted individually or all at once.

[0033] Fig. 5 is a diagram showing an example of the temperature distribution of the tube sheet portion 21 obtained by a thermal fluid analysis of the incineration equipment 1 according to the first embodiment. Fig. 5 shows a view of the incineration equipment 1 shown in Fig. 1 as seen from the positive direction of the Y axis.

[0034] As shown in Figure 5, by performing a thermal fluid analysis on the incineration facility 1, it is possible to obtain the temperature distribution in the cross-sectional area of ​​the tube sheet section 21 when the exhaust gas 3 discharged from the fluidized incinerator 10 flows into the air preheater 20 through the duct 30 as an analysis result. From the example shown in Figure 5, it can be seen that the temperature distribution in the cross-sectional area of ​​the tube sheet section 21 varies from about 849°C to about 854°C, and the temperature difference between the maximum and minimum temperatures is about 5°C. Similarly, it is also possible to obtain changes in temperature distribution in the cross-sectional area of ​​the tube sheet portion 21 when the flow rates of the cooling water 4 supplied from the multiple water sprays 40 are adjusted individually or collectively.

[0035] 4 and 5, it is possible to know which thermometer 60 indicates which region of the tube sheet section 21 has changed in temperature when the flow rate of the cooling water 4 supplied from which water spray 40 is adjusted by which valve 50 and the cooling water 4 is supplied to which region of the upper part 12C of the freeboard section 12. This makes it possible to prepare corresponding information such as that shown in FIG.

[0036] <1-2. Functional configuration of cooling control device> The schematic configuration of the incineration facility 1 according to the first embodiment has been described above. Next, the functional configuration of the cooling control device 100 according to the first embodiment will be described with reference to Fig. 6. Fig. 6 is a diagram showing an example of the functional configuration of the cooling control device 100 according to the first embodiment. As shown in FIG. 6, the cooling control device 100 includes a communication unit 110, a storage unit 120, and a control unit .

[0037] (1) Communications Department 110 The communication unit 110 has a function of transmitting and receiving various information. For example, the communication unit 110 receives temperature information from the thermometer 60 and transmits a control signal to the valve 50.

[0038] (2) Storage section 120 The storage unit 120 has a function of storing various information. The storage unit 120 is configured by a storage medium provided as hardware in the cooling control device 100, such as a hard disk drive (HDD), a solid state drive (SSD), a flash memory, an electrically erasable programmable read only memory (EEPROM), a random access read / write memory (RAM), a read only memory (ROM), or any combination of these storage media. The storage unit 120 stores, for example, the correspondence information.

[0039] (3) Control unit 130 The control unit 130 has a function of controlling the overall operation of the cooling control device 100. The control unit 130 is realized, for example, by causing a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit) provided as hardware in the cooling control device 100 to execute a program. As shown in FIG. 6, the control unit 130 includes a temperature information acquisition unit 131, a control target selection unit 132, and a flow rate control unit 133.

[0040] (3-1) Temperature information acquisition unit 131 The temperature information acquisition unit 131 has a function of acquiring temperature information. For example, the temperature information acquisition unit 131 acquires temperature information received by the communication unit 110 from the thermometer 60. The temperature information acquisition unit 131 outputs the acquired temperature information to the control target selection unit 132 and the flow rate control unit 133.

[0041] (3-2) Control object selection unit 132 The control target selection unit 132 has a function of selecting a control target. For example, the control target selection unit 132 selects a water spray 40 to be controlled from among the multiple water sprays 40 provided in the upper portion 12C of the freeboard section 12 of the fluidized incinerator 10 based on the temperature information acquired by the temperature information acquisition unit 131.

[0042] First, the control target selection unit 132 determines whether or not the temperature of the tube sheet portion 21 of the air preheater 20 needs to be adjusted, based on the temperature information. When the temperature information indicates that temperature adjustment of the tube sheet section 21 is necessary, the control object selection unit 132 selects, as a control object, the water sprays 40 that supply cooling water 4 to an area in the furnace corresponding to the area of ​​the tube sheet section 21 that requires temperature adjustment. At this time, the control object selection unit 132 determines, based on the correspondence information stored in the memory unit 120, an area in the furnace that corresponds to the area of ​​the tube sheet section 21 that requires temperature adjustment, and selects, as a control object, the water sprays 40 that are provided to supply cooling water 4 to the determined area. On the other hand, if the temperature information does not indicate that temperature adjustment of the tube sheet portion 21 is necessary, the control object selection unit 132 determines that temperature adjustment of the region of the tube sheet portion 21 is not necessary and does not select a control object.

[0043] Here, the determination of whether or not the temperature of the tube sheet section 21 needs to be adjusted will be specifically described. For example, the control target selection unit 132 determines whether or not there is a region in the multiple regions divided into the tube sheet section 21 where the temperature indicated by the temperature information is equal to or higher than a predetermined temperature. The predetermined temperature in this determination is, for example, the minimum temperature at which problems such as thermal damage, adhesion due to melting of incineration ash, and blockage may occur in the air preheater 20. When there is a region where the temperature is equal to or higher than a predetermined temperature, the control object selection unit 132 determines that the temperature of that region of the tube sheet portion 21 needs to be adjusted. For example, when the temperature information acquired by the thermometer 60A' indicates the maximum temperature and is equal to or higher than a predetermined temperature, the control target selection unit 132 determines that the temperature of the region 22A' needs to be adjusted. Furthermore, when the temperature information acquired by the thermometer 60B' indicates the maximum temperature and is equal to or higher than a predetermined temperature, the control object selection unit 132 determines that the temperature of the region 22B' needs to be adjusted. Furthermore, when the temperature information acquired by the thermometer 60C' indicates the maximum temperature and is equal to or higher than a predetermined temperature, the control object selection unit 132 determines that the temperature of the area 22C' needs to be adjusted. Furthermore, when the temperature information acquired by the thermometer 60D' indicates the maximum temperature and is equal to or higher than a predetermined temperature, the control object selection unit 132 determines that the temperature of the area 22D' needs to be adjusted. On the other hand, if there is no area where the maximum temperature is higher than the predetermined temperature, i.e., if the temperatures of all areas are lower than the predetermined temperature, the control object selection unit 132 determines that temperature adjustment is not necessary for that area of ​​the tube sheet section 21.

[0044] If this judgment determines that temperature adjustment of the tube sheet section 21 is necessary, the control object selection unit 132 selects as the control object the water spray 40 that supplies cooling water 4 to an area in the furnace corresponding to an area where the temperature indicated by the temperature information is higher than or equal to a predetermined temperature, among the multiple areas divided into the tube sheet section 21. For example, when it is determined that the temperature of region 22A' needs to be adjusted, control object selection unit 132 refers to the correspondence information to confirm information associated with region 22A'. In the case of the correspondence information shown in Fig. 3, region 13C, water spray 40C, and valve 50C are associated with region 22A'. Therefore, control object selection unit 132 selects water spray 40C as the control object. Furthermore, when it is determined that temperature adjustment of region 22B' is necessary, controlled object selection unit 132 refers to the correspondence information to confirm information associated with region 22B'. In the case of the correspondence information shown in Fig. 3, region 13A, water spray 40A, and valve 50A are associated with region 22B'. Therefore, controlled object selection unit 132 selects water spray 40A as the controlled object. Furthermore, when it is determined that the temperature of region 22C' needs to be adjusted, control object selection unit 132 refers to the correspondence information to confirm information associated with region 22C'. In the case of the correspondence information shown in Fig. 3, region 13D, water spray 40D, and valve 50D are associated with region 22C'. Therefore, control object selection unit 132 selects water spray 40D as the control object. Furthermore, when it is determined that the temperature of region 22D' needs to be adjusted, control object selection unit 132 refers to the correspondence information to confirm information associated with region 22D'. In the case of the correspondence information shown in Fig. 3, region 13B, water spray 40B, and valve 50B are associated with region 22D'. Therefore, control object selection unit 132 selects water spray 40B as the control object.

[0045] The control object selection unit 132 may also determine whether or not temperature adjustment of the tube sheet section 21 is necessary based on temperature differences in multiple regions of the tube sheet section 21. For example, the control object selection unit 132 determines whether or not the temperature difference between the region in which the temperature information indicates the maximum temperature and the region in which the temperature information indicates the minimum temperature in multiple regions divided into the tube sheet section 21 is equal to or greater than a predetermined temperature difference. The predetermined temperature difference in this determination is, for example, the minimum temperature difference at which thermal damage such as thermal cracking may occur in the tube sheet section 21. If the temperature difference is equal to or greater than a predetermined temperature difference, the control object selection unit 132 determines that temperature adjustment of the tube sheet section 21 is necessary. For example, if the temperature information acquired by the thermometer 60A' indicates the maximum temperature, the temperature information acquired by the thermometer 60C' indicates the minimum temperature, and the temperature difference is equal to or greater than a predetermined temperature difference, the control object selection unit 132 determines that temperature adjustment of the regions 22A' and 22C' is necessary. Similarly, if there is another combination of the region with the maximum temperature and the region with the minimum temperature, the control object selection unit 132 determines the region that requires temperature adjustment. On the other hand, when the temperature difference is less than the predetermined temperature difference, the control target selection unit 132 determines that the temperature adjustment of the tube sheet portion 21 is not necessary.

[0046] If this judgment determines that temperature adjustment of the tube sheet section 21 is necessary, the control object selection unit 132 selects as control objects the water sprays 40 that supply cooling water 4 to the area in the furnace corresponding to the area where the temperature indicated by the temperature information is the highest temperature, and the water sprays 40 that supply cooling water 4 to the area in the furnace corresponding to the area where the temperature indicated by the temperature information is the lowest temperature, among the multiple areas divided into the tube sheet section 21. For example, when the control object selection unit 132 determines that the temperature adjustment of the region 22A' and the region 22C' is necessary, the control object selection unit 132 refers to the correspondence information and checks the information associated with the region 22A' and the information associated with the region 22C'. In the case of the correspondence information shown in FIG. 3, the region 22A' is associated with the region 13C, the water spray 40C, and the valve 50C, and the region 22C' is associated with the region 13D, the water spray 40D, and the valve 50D. Therefore, the control object selection unit 132 selects the water spray 40C and the water spray 40D as the control object. Similarly, when the combination of the regions requiring the temperature adjustment is another combination, the control object selection unit 132 refers to the correspondence information and selects the control object. At this time, the control object selection unit 132 may select as the control object only one of the water sprays 40 that supply cooling water 4 to the area in the furnace corresponding to the area with the highest temperature, and the water sprays 40 that supply cooling water 4 to the area in the furnace corresponding to the area with the lowest temperature indicated by the temperature information.

[0047] The control object selection unit 132 may combine the judgment based on only the maximum temperature and the judgment based on the temperature difference between the maximum and minimum temperatures. In this case, when the control object selection unit 132 judges that the temperature adjustment is not necessary for the region of the tube sheet portion 21 based on the judgment based on only the maximum temperature, the control object selection unit 132 further judges based on the temperature difference between the maximum and minimum temperatures. When it is determined based on the temperature difference between the maximum and minimum temperatures that temperature adjustment is necessary for the region of the tube sheet section 21, the control object selection unit 132 selects a control object. On the other hand, when it is determined based on the temperature difference between the maximum and minimum temperatures that temperature adjustment is not necessary for the region of the tube sheet section 21, the control object selection unit 132 does not select a control object.

[0048] (3-3) Flow control unit 133 The flow rate control unit 133 has a function of controlling the flow rate of the cooling water 4 supplied from the water spray 40. For example, the flow rate control unit 133 controls the flow rate of the cooling water 4 supplied from the water spray 40 selected as the control target into the furnace based on the temperature information acquired by the temperature information acquisition unit 131.

[0049] The flow rate control unit 133 controls the flow rate of the cooling water 4 supplied from the water spray 40 selected as the control target so that the temperatures indicated by the temperature information in multiple regions obtained by dividing the cross-sectional area of ​​the tube sheet section 21 become less than a predetermined temperature. For example, it is assumed that the control target selection unit 132 selects the control target by determination based only on the maximum temperature. In this case, the flow rate control unit 133 transmits a control signal to the valve 50 that controls the flow rate of the water spray 40 that supplies the cooling water 4 to the region having the highest temperature in the region of the tube sheet section 21 so that the temperature of the region having the highest temperature becomes less than the predetermined temperature.

[0050] In the determination based only on the maximum temperature, the flow rate control unit 133 determines the valve 50 corresponding to the control object selected by the control object selection unit 132 based on the correspondence information stored in the storage unit 120 . For example, when water spray 40C is selected as the control target by control target selection unit 132, flow rate control unit 133 refers to the correspondence information to confirm the information associated with water spray 40C. In the case of the correspondence information shown in Fig. 3, valve 50C is associated with water spray 40C. Therefore, flow rate control unit 133 determines that valve 50 corresponding to water spray 40C, which is the control target, is valve 50C. Similarly, when the control target is a control target other than water spray 40C, flow rate control unit 133 refers to the correspondence information to determine the valve 50 corresponding to the control target.

[0051] Furthermore, the flow rate control unit 133 controls the flow rate of the cooling water 4 supplied from the water spray 40 selected as the control target so that the temperature difference indicated by the temperature information in a plurality of regions obtained by dividing the cross-sectional area of ​​the tube sheet section 21 is less than a predetermined temperature difference. For example, it is assumed that the control target selection unit 132 selects the control target by determination based on the temperature difference between the maximum temperature and the minimum temperature. In this case, the flow rate control unit 133 transmits a control signal to the valve 50 that controls the flow rate of the water spray 40 that supplies the cooling water 4 to a necessary region so that the temperature difference between the maximum temperature region and the minimum temperature region in the region of the tube sheet section 21 is less than the predetermined temperature difference.

[0052] In the determination based on the temperature difference between the maximum temperature and the minimum temperature, the flow control unit 133 determines the valve 50 corresponding to the control object selected by the control object selection unit 132 based on the correspondence information stored in the storage unit 120. For example, when water spray 40C and water spray 40D are selected as control targets by control target selection unit 132, flow rate control unit 133 refers to the correspondence information to confirm the information associated with water spray 40C and the information associated with water spray 40D. In the case of the correspondence information shown in Fig. 3, valve 50C is associated with water spray 40C, and valve 50D is associated with water spray 40D. Therefore, the flow control unit 133 determines that the valve 50 corresponding to the water spray 40C that is the control target is the valve 50C, and that the valve 50 corresponding to the water spray 40D is the valve 50D. Similarly, when the control target is a combination other than the water spray 40C and the water spray 40D, the flow control unit 133 refers to the correspondence information and determines the valve 50 that corresponds to the control target.

[0053] In addition, when the control object selection unit 132 determines based on the temperature difference between the maximum temperature and the minimum temperature that only the water spray 40 corresponding to one of the temperatures is selected as the control object, the flow control unit 133 sends a control signal only to the valve 50 corresponding to the selected water spray 40.

[0054] <1-3. Processing flow> The functional configuration of the cooling control device 100 according to the first embodiment has been described above. Next, the flow of processing according to the first embodiment will be described with reference to Fig. 7. Fig. 7 is a flow chart showing an example of the flow of processing in the cooling control device 100 according to the first embodiment.

[0055] As shown in FIG. 7, first, the temperature information acquisition unit 131 of the cooling control device 100 acquires temperature information measured by the multiple thermometers 60 provided on the tube sheet portion 21 of the air preheater 20 (step S101).

[0056] Next, the control target selection unit 132 of the cooling control device 100 determines, based on the temperature information acquired by the temperature information acquisition unit 131, whether or not temperature adjustment of the tube sheet portion 21 of the air preheater 20 is necessary. First, the control object selection unit 132 determines whether or not there is an area in which the temperature indicated by the temperature information is equal to or higher than a predetermined temperature among the multiple areas divided into the tube sheet section 21 (step S102). If there is an area in which the temperature is equal to or higher than the predetermined temperature (step S102 / YES), the control object selection unit 132 determines that the temperature adjustment is required for that area of ​​the tube sheet section 21, and proceeds to step S104. On the other hand, if there is no area in which the temperature is equal to or higher than the predetermined temperature (step S102 / NO), the control object selection unit 132 proceeds to step S103.

[0057] When the process proceeds to step S103, the control object selection unit 132 determines whether or not the temperature difference between the region where the temperature indicated by the temperature information is the maximum temperature and the region where the temperature indicated by the temperature information is the minimum temperature is equal to or greater than a predetermined temperature difference in a plurality of regions obtained by dividing the cross-sectional region of the tube sheet section 21 (step S103). When there is a region where the temperature difference is equal to or greater than the predetermined temperature difference (step S103 / YES), the control object selection unit 132 determines that the temperature adjustment is required for that region of the tube sheet section 21, and proceeds to step S104. On the other hand, when there is no region where the temperature difference is equal to or greater than the predetermined temperature difference (step S103 / NO), the control object selection unit 132 determines that the temperature adjustment of each region of the tube sheet section 21 is not required, and returns the process to step S101.

[0058] When the process proceeds to step S104, the control object selection unit 132 selects a control object (step S104). At this time, the control object selection unit 132 selects the control object based on the result of the determination in step S102 or step S103 and the corresponding information stored in the storage unit 120. For example, if it is determined in step S102 that temperature adjustment of the tube sheet section 21 is necessary, the control object selection unit 132 selects, based on the correspondence relationship indicated by the correspondence information, the water spray 40 corresponding to the area in the tube sheet section 21 where the temperature indicated by the temperature information is higher than or equal to a predetermined temperature, as the control object. In addition, if it is determined in step S103 that temperature adjustment of the tube sheet section 21 is necessary, the control object selection unit 132 selects, as the control object, the water sprays 40 corresponding to the areas in the tube sheet section 21 where the temperatures indicated by the temperature information are the highest and lowest, based on the correspondence relationship indicated by the correspondence information.

[0059] Next, the flow rate control unit 133 of the cooling control device 100 controls the flow rate of the cooling water 4 supplied from the water spray 40 which is the control target selected by the control target selection unit 132 (step S105). At this time, the flow rate control unit 133 determines the valve 50 corresponding to the control target based on the correspondence information stored in the storage unit 120, and transmits a control signal to the valve 50. Also, based on the temperature information acquired by the temperature information acquisition unit 131, the flow rate control unit 133 determines the control amount of the valve 50 so that the temperature after control is less than a predetermined temperature or the temperature difference after control is less than a predetermined temperature difference.

[0060] After step S105, the cooling control device 100 returns the process to step S101, and repeats the processes of steps S101 to S105 until step S103 becomes NO.

[0061] As described above, the cooling control device 100 of the first embodiment comprises a temperature information acquisition unit 131 that acquires temperature information indicating the temperature at the tube plate section 21 (inlet section) of the air preheater 20 (equipment) into which the exhaust gas 3 discharged from the fluidized incinerator 10 flows, a control target selection unit 132 that selects a water spray 40 to be controlled from among a plurality of water sprays 40 (water supply devices) provided on the upper part 12C of the freeboard section 12 of the fluidized incinerator 10 based on the acquired temperature information, and a flow rate control unit 133 that controls the flow rate of the cooling water 4 supplied to the furnace from the water spray 40 selected as the control target based on the acquired temperature information.

[0062] With this configuration, in the fluidized incinerator 10, the temperature of the exhaust gas 3 is adjusted by the water spray 40 in the upper part 12C of the freeboard section 12. This reduces the number of high-temperature or low-temperature parts locally generated in the exhaust gas 3, and prevents problems such as heat damage in the air preheater 20 and adhesion or blockage due to melting of incineration ash. In addition, in the fluidized incinerator 10, the cooling water 4 is supplied in a dispersed manner from a plurality of water sprays 40, so the flow rate of the cooling water 4 supplied from one water spray 40 is reduced, preventing the cooling water 4 from dripping onto the lower portion 12A of the freeboard section 12 and preventing the occurrence of low temperature areas. This makes it possible to prevent the occurrence of low temperature areas in the fluidized incinerator 10 from hindering the reduction of nitrous oxide emissions or the occurrence of high temperature areas, the occurrence of local low temperature and high temperature areas in the fluidized incinerator 10 from causing temperature differences in the exhaust gas 3, and the occurrence of problems due to the temperature of the exhaust gas in the air preheater 20 into which the exhaust gas 3 discharged from the fluidized incinerator 10 flows.

[0063] Therefore, the cooling control device 100 of the first embodiment makes it possible to prevent problems caused by the temperature of the exhaust gas 3 in the air preheater 20 (equipment) into which the exhaust gas 3 discharged from the fluidized incinerator 10 flows.

[0064] <1-4. Modifications> The first embodiment has been described above. Next, modified examples of the first embodiment described above will be described. Note that each modified example described below may be applied to the first embodiment alone, or may be applied to the first embodiment in combination. Also, each modified example may be applied in place of the configuration described in the first embodiment, or may be applied in addition to the configuration described in the first embodiment.

[0065] In the above-described first embodiment, the correspondence information is stored in the storage unit 120 of the cooling control device 100, and an example has been described in which the flow control unit 133 controls the flow rate for a control target selected by the control target selection unit 132 based on the correspondence information, but the present invention is not limited to such an example. For example, the cooling control device 100 may be configured such that the flow control unit 133 can control the flow rate for a control target selected without using the correspondence information.

[0066] Here, a hardware configuration of the cooling control device 100A in this case will be described with reference to Fig. 8. Fig. 8 is a diagram showing an example of a hardware configuration of a cooling control device 100A according to a modification of the first embodiment.

[0067] As shown in Fig. 8, the cooling control device 100A includes a TIC (Temperature Indication Controller) 101 and a FIC (Flow Indication Controller) 102. Temperature information measured by thermometers 60A'-60D' is input to the TIC 101. The TIC 101 and the FIC 102 are wired together. For example, when it is determined that a temperature adjustment is required for a region of the tube sheet portion 21, the TIC 101 and the FIC 102 are wired together so as to be able to transmit a control signal to the valve 50 corresponding to that region. In FIG. 8, for example, when it is determined that temperature adjustment of area 22A' is necessary based on temperature information acquired by thermometer 60A', the wiring is configured to send a control signal to valve 50C corresponding to water spray 40C that supplies cooling water 4 to area 13C. In addition, when it is determined that temperature adjustment of area 22B' is necessary based on the temperature information acquired by thermometer 60B', the thermometer 60B' is wired to send a control signal to valve 50A corresponding to water spray 40A that supplies cooling water 4 to area 13A. In addition, when it is determined that temperature adjustment of area 22C' is necessary based on the temperature information obtained by thermometer 60C', the valve 50D corresponding to the water spray 40D that supplies cooling water 4 to area 13D is wired to send a control signal to the valve 50D corresponding to the water spray 40D. In addition, when it is determined that temperature adjustment of area 22D' is necessary based on the temperature information obtained by thermometer 60D', the thermometer 60D' is wired to send a control signal to valve 50B corresponding to water spray 40B that supplies cooling water 4 to area 13B. This allows the control object selection unit 132 to transmit a control signal to the valve 50 corresponding to the region of the tube sheet portion 21 for which it has been determined that temperature adjustment is necessary, without using the correspondence information.

[0068] In the above-mentioned first embodiment, an example has been described in which the thermometer 60 is provided in each of the regions obtained by dividing the cross-sectional region of the tube sheet section 21 into a plurality of regions, but the present invention is not limited to such an example. For example, the thermometer 60 may be provided only in the region of the tube sheet section 21 that has the highest temperature and the region of the lowest temperature. The region of the tube sheet section 21 that has the highest temperature and the region of the lowest temperature can be detected in advance based on the analysis results of a thermal fluid analysis of the incineration equipment 1.

[0069] In the above-described first embodiment, an example has been described in which the number of divisions of the cross-sectional area of ​​the upper portion 12C of the freeboard portion 12, the number of water sprays 40, the number of valves 50, the number of divisions of the cross-sectional area of ​​the tube sheet portion 21, and the number of thermometers 60 are each four, but the present invention is not limited to such an example. Any number may be set according to the size of the fluidized incinerator 10 and the size of the air preheater 20. For example, the cross-sectional area of ​​the upper portion 12C of the freeboard portion 12 and the cross-sectional area of ​​the tube sheet portion 21 may each be divided into six, and six water sprays 40, six valves 50, and six thermometers 60 may each be provided.

[0070] <<2. Second embodiment>> Having described the first embodiment, the second embodiment will now be described with reference to Figs. In the above-mentioned first embodiment, an example was described in which one cooling control device selects a water spray to be controlled from among multiple water sprays based on temperature information transmitted from a thermometer, and controls the flow rate of cooling water supplied to the furnace from the water spray selected as the control target (i.e., a 1:multiple relationship between the cooling control device and the valves), but this is not limited to such an example. In the second embodiment, an example will be described in which cooling control devices are prepared according to the number of valves (i.e., multiple cooling control devices), and one cooling control device controls one valve (i.e., a 1:1 relationship between the cooling control device and the valves). In the following, explanations that overlap with the first embodiment will be omitted as appropriate.

[0071] <2-1. Outline of incineration facility> The schematic configuration of the incineration facility according to the second embodiment is similar to the schematic configuration of the incineration facility 1 described with reference to FIG. 1 in the above-mentioned first embodiment, and therefore description thereof will be omitted. In the following, the incineration facility according to the second embodiment and each component included in the incineration facility will be designated by the same reference numerals as the incineration facility 1 according to the first embodiment and each component included in the incineration facility 1. Note that the cooling control device will be designated by the reference numeral 100B.

[0072] Here, the correspondence relationship between the region to which the cooling water 4 is supplied, the region of the tube sheet portion 21, the cooling control device 100B, and input / output according to the second embodiment will be described with reference to Fig. 9. Fig. 9 is a diagram showing an example of the input / output relationship between the region to which the cooling water 4 is supplied, the region of the tube sheet portion 21, and the cooling control device 100B according to the second embodiment. The example shown in Fig. 9 differs from the example described with reference to Fig. 2 in the first embodiment in that there are multiple cooling control devices 100B. In the example shown in Fig. 9, as an example, four cooling control devices 100B-1 to 100B-4 are provided. Accordingly, the input / output relationship in the cooling control device 100B differs from the input / output relationship in the cooling control device 100 of the first embodiment. The thermometers 60A'-60D' are connected to the cooling control devices 100B-1-100B-4 so as to be able to transmit measured temperature information of the region of the tube sheet portion 21 to each of the cooling control devices 100B-1-100B-4. That is, each of the cooling control devices 100B-1-100B-4 receives temperature information from all of the thermometers 60A'-60D'. Each valve 50 is connected to one of the cooling control devices 100B-1 to 100B-4 so as to be able to receive a control signal for controlling the flow rate of the cooling water 4 from a corresponding one of the cooling control devices. That is, each of the cooling control devices 100B-1 to 100B-4 transmits a control signal only to the valve 50 connected to the own device. In the example shown in FIG. 9, the cooling control device 100B-1 is connected to the valve 50D, the cooling control device 100B-2 is connected to the valve 50A, the cooling control device 100B-3 is connected to the valve 50C, and the cooling control device 100B-4 is connected to the valve 50B.

[0073] Each of the cooling control devices 100B-1 to 100B-4 judges whether or not it is necessary to adjust the temperature of the area corresponding to the device among the areas 22A' to 22D' based on the temperature information input from the thermometers 60A' to 60D'. In the example shown in Fig. 9, the cooling control device 100B-1 judges the area 22C', the cooling control device 100B-2 judges the area 22B', the cooling control device 100B-3 judges the area 22A', and the cooling control device 100B-4 judges the area 22D'. Each of the cooling control devices 100B-1 to 100B-4 has area correspondence information indicating which area of ​​the areas 22A' to 22D' the device corresponds to, for example, and recognizes the area corresponding to the device based on the area correspondence information. Of the cooling control devices 100B-1 to 100B-4, the cooling control device that has determined that the temperature of its corresponding region needs to be adjusted transmits a control signal to the valve 50 connected to its own device.

[0074] The corresponding relationship between each of the cooling control devices 100B-1 to 100B-4 and the regions 22A' to 22D', and the connection relationship between each of the cooling control devices 100B-1 to 100B-4 and the valves 50A to 50D are set in advance based on the results of a thermal fluid analysis of the incineration facility 1. This thermal fluid analysis makes it possible to know which region of the regions 22A' to 22D' of the air preheater 20 will change in temperature when cooling water 4 is supplied to which region of the regions 13A to 13D in the fluidized incinerator 10. In the example shown in Figure 9, as an example, supplying cooling water to region 13A changes the temperature of region 22B', supplying cooling water to region 13B changes the temperature of region 22D', supplying cooling water to region 13C changes the temperature of region 22A', and supplying cooling water to region 13D changes the temperature of region 22C'. Thus, in the example shown in FIG. 9, cooling control device 100B-1 is connected to valve 50D to adjust the temperature of region 22C', cooling control device 100B-2 is connected to valve 50A to adjust the temperature of region 22B', cooling control device 100B-3 is connected to valve 50C to adjust the temperature of region 22A', and cooling control device 100B-4 is connected to valve 50B to adjust the temperature of region 22D'.

[0075] <2-2. Functional configuration of cooling control device> The schematic configuration of the incineration facility 1 according to the second embodiment has been described above. Next, the functional configuration of the cooling control device 100B according to the second embodiment will be described with reference to Fig. 10. Fig. 10 is a diagram showing an example of the functional configuration of the cooling control device 100B according to the second embodiment. As shown in FIG. 10, the cooling control device 100B includes a communication unit 110B, a storage unit 120B, and a control unit 130B.

[0076] (1) Communication department 110B The communication unit 110B has a function of transmitting and receiving various information. For example, the communication unit 110B receives temperature information from all of the thermometers 60A' to 60D', and transmits a control signal to the valve 50 connected to the own device among the valves 50A to 50D.

[0077] (2) Storage section 120B The storage unit 120B has a function of storing various types of information, for example, area correspondence information.

[0078] (3) Control unit 130B The control unit 130B has a function of controlling the overall operation of the cooling control device 100B. As shown in FIG. 10, the control unit 130B includes a temperature information acquisition unit 131B, a control necessity determination unit 134, and a flow rate control unit 133B.

[0079] (3-1) Temperature information acquisition section 131B The temperature information acquisition unit 131B has a function of acquiring temperature information. For example, the temperature information acquisition unit 131B acquires temperature information received by the communication unit 110B from the thermometers 60A' to 60D'. The temperature information acquisition unit 131B outputs the acquired temperature information to the control necessity determination unit 134 and the flow rate control unit 133B.

[0080] (3-2) Control necessity determination unit 134 The control necessity determination unit 134 has a function of determining whether or not control is necessary. For example, the control necessity determination unit 134 determines whether or not control is necessary to adjust the temperature in the region of the tube sheet portion 21 corresponding to the device itself, based on the temperature information acquired by the temperature information acquisition unit 131B.

[0081] The control necessity determination unit 134 determines whether the temperature indicated by the temperature information of the region corresponding to the device itself is equal to or higher than a predetermined temperature in the multiple regions divided into the tube sheet portion 21. If the temperature is equal to or higher than the predetermined temperature, the control necessity determination unit 134 determines that control is necessary. For example, in the example shown in FIG. 9, the control necessity determination unit 134 of the cooling control device 100B-1 determines that control for temperature adjustment is required for the area 22C' when the temperature of the area 22C' indicated by the temperature information acquired from the thermometer 60C' is equal to or higher than a predetermined temperature. The control necessity determining unit 134 of the cooling control device 100B-2 determines that control for adjusting the temperature of the region 22B' is necessary when the temperature of the region 22B' indicated by the temperature information acquired from the thermometer 60B' is equal to or higher than a predetermined temperature. The control necessity determining unit 134 of the cooling control device 100B-3 determines that control for adjusting the temperature of the area 22A' is necessary when the temperature of the area 22A' indicated by the temperature information acquired from the thermometer 60A' is equal to or higher than a predetermined temperature. The control necessity determining unit 134 of the cooling control device 100B-4 determines that control for adjusting the temperature of the area 22D' is necessary when the temperature of the area 22D' indicated by the temperature information acquired from the thermometer 60D' is equal to or higher than a predetermined temperature. On the other hand, when the temperature indicated by the temperature information of the area corresponding to the own device is lower than the predetermined temperature, the control necessity determining unit 134 determines that control is unnecessary.

[0082] The control necessity determination unit 134 may also determine whether or not temperature adjustment of the tube sheet section 21 is necessary based on the temperature difference in multiple regions of the tube sheet section 21. For example, the control necessity determination unit 134 determines whether or not the temperature difference between a region in which the temperature indicated by the temperature information of the region corresponding to the own device is the highest temperature and a region in which the temperature indicated by the other temperature information is the lowest temperature is equal to or greater than a predetermined temperature difference in multiple regions divided into the tube sheet section 21. If the temperature difference is equal to or greater than the predetermined temperature difference, the control necessity determination unit 134 determines that control is necessary. For example, in the example shown in FIG. 9, the control necessity determination unit 134 of the cooling control device 100B-1 determines that control for temperature adjustment is necessary for area 22C' when the temperature information acquired from thermometer 60C' indicates that the temperature of area 22C' is the highest temperature and the temperature difference between this area and the area indicated by other temperature information that has the lowest temperature is equal to or greater than a predetermined temperature difference. The control necessity determination unit 134 of the cooling control device 100B-2 determines that control for temperature adjustment is necessary for area 22B' when the temperature information acquired from the thermometer 60B' indicates that the temperature of area 22B' is the highest temperature and the temperature difference between this area and the temperature information indicating the lowest temperature is greater than or equal to a predetermined temperature difference. The control necessity determination unit 134 of the cooling control device 100B-3 determines that control for temperature adjustment is necessary for area 22A' when the temperature information acquired from the thermometer 60A' indicates that the temperature of area 22A' is the highest temperature and the temperature difference between this area and the temperature information indicating the lowest temperature is greater than or equal to a predetermined temperature difference. The control necessity determination unit 134 of the cooling control device 100B-4 determines that control for temperature adjustment is necessary for area 22D' when the temperature information acquired from the thermometer 60D' indicates that the temperature of area 22D' is the highest temperature and the temperature difference between this area and the temperature information indicating the lowest temperature is greater than or equal to a predetermined temperature difference. On the other hand, the control necessity determination unit 134 determines that control is unnecessary when the temperature indicated by the temperature information of the area corresponding to the own device is the highest temperature, but the temperature difference between this area and another area indicated by the temperature information of the other area is the lowest temperature, is less than a predetermined temperature difference.

[0083] In addition, even if the control necessity determination unit 134 determines that the temperature indicated by the temperature information of the area corresponding to the device itself is below a predetermined temperature and that control is unnecessary, it may determine that control is necessary based on a judgment based on the temperature difference with other areas.

[0084] (3-3) Flow control unit 133B The flow rate control unit 133B has a function of controlling the flow rate of the cooling water 4 supplied from the water spray 40. For example, when the control necessity determination unit 134 determines that control is necessary, the flow rate control unit 133 controls the flow rate of the cooling water 4 supplied from the water spray 40 connected to its own device to the furnace based on the temperature information acquired by the temperature information acquisition unit 131.

[0085] Assume that the control necessity determination unit 134 determines that control is necessary because the temperature indicated by the temperature information of the region corresponding to the own device is equal to or higher than a predetermined temperature. In this case, the flow rate control unit 133B controls the flow rate of the cooling water 4 supplied from the water spray 40 connected to the own device, so that the temperature indicated by the temperature information of the region corresponding to the own device becomes less than the predetermined temperature in a plurality of regions obtained by dividing the cross-sectional region of the tube sheet portion 21. Specifically, the flow rate control unit 133B transmits a control signal to the valve 50 that controls the flow rate of the water spray 40 connected to the own device, so that the temperature of the region corresponding to the own device becomes less than the predetermined temperature. For example, in the example shown in FIG. 9, when the control necessity determination unit 134 determines that control is necessary for region 22C', the flow control unit 133B of the cooling control device 100B-1 sends a control signal to the valve 50D connected to the device so that the temperature of region 22C' becomes less than a predetermined temperature. When the control necessity determination unit 134 determines that control is necessary for the region 22B', the flow control unit 133B of the cooling control device 100B-2 sends a control signal to the valve 50A connected to the device so that the temperature of the region 22B' becomes less than a predetermined temperature. When the control necessity determination unit 134 determines that control is necessary for the region 22A', the flow control unit 133B of the cooling control device 100B-3 sends a control signal to the valve 50C connected to the device so that the temperature of the region 22A' becomes less than a predetermined temperature. When the control necessity determination unit 134 determines that control is necessary for the region 22D', the flow control unit 133B of the cooling control device 100B-4 sends a control signal to the valve 50B connected to the device so that the temperature of the region 22D' becomes less than a predetermined temperature.

[0086] Assume that the control necessity determination unit 134 determines that control is necessary because the temperature difference between the region corresponding to the own device and other regions is equal to or greater than a predetermined temperature difference. In this case, the flow rate control unit 133B controls the flow rate of the cooling water 4 supplied from the water spray 40 connected to the own device so that the temperature difference between the maximum temperature indicated by the temperature information of the region corresponding to the own device and the minimum temperature indicated by the other temperature information becomes less than the predetermined temperature difference in a plurality of regions obtained by dividing the cross-sectional region of the tube sheet portion 21. Specifically, the flow rate control unit 133B transmits a control signal to the valve 50 that controls the flow rate of the water spray 40 connected to the own device so that the temperature difference becomes less than the predetermined temperature difference. For example, in the example shown in FIG. 9, when the control necessity determination unit 134 determines that control is necessary for region 22C', the flow control unit 133B of the cooling control device 100B-1 sends a control signal to the valve 50D connected to the device so that the temperature difference between the temperature of region 22C' and the minimum temperature is less than a predetermined temperature difference. When the control necessity determination unit 134 determines that control is necessary for the region 22B', the flow control unit 133B of the cooling control device 100B-2 sends a control signal to the valve 50A connected to the device so that the temperature difference between the temperature of the region 22B' and the minimum temperature is less than a predetermined temperature difference. When the control necessity determination unit 134 determines that control is necessary for the region 22A', the flow control unit 133B of the cooling control device 100B-3 sends a control signal to the valve 50C connected to the device so that the temperature difference between the temperature of the region 22A' and the minimum temperature is less than a predetermined temperature difference. When the control necessity determination unit 134 determines that control is necessary for the region 22D', the flow control unit 133B of the cooling control device 100B-4 sends a control signal to the valve 50B connected to the device so that the temperature difference between the temperature of the region 22D' and the minimum temperature is less than a predetermined temperature difference.

[0087] <2-3. Processing flow> The functional configuration of the cooling control device 100B according to the second embodiment has been described above. Next, the flow of processing according to the second embodiment will be described with reference to Fig. 11. Fig. 11 is a flow chart showing an example of the flow of processing in the cooling control device 100B according to the second embodiment.

[0088] As shown in FIG. 11, first, the temperature information acquisition unit 131B of the cooling control device 100B acquires temperature information measured by the multiple thermometers 60 provided on the tube sheet portion 21 of the air preheater 20 (step S201).

[0089] Next, the control necessity determination unit 134 of the cooling control device 100B determines, based on the temperature information acquired by the temperature information acquisition unit 131B, whether or not control is necessary to adjust the temperature in the area of ​​the tube sheet section 21 corresponding to the cooling control device itself (the cooling control device 100B). First, the control necessity determination unit 134 determines whether or not the temperature indicated by the temperature information of the region corresponding to the device itself is equal to or higher than a predetermined temperature in the multiple regions divided into the tube sheet portion 21 (step S202). If the temperature is equal to or higher than the predetermined temperature (step S202 / YES), the control necessity determination unit 134 determines that control is necessary and proceeds to step S204. On the other hand, if the temperature is lower than the predetermined temperature (step S202 / NO), the control necessity determination unit 134 proceeds to step S203.

[0090] When the process proceeds to step S203, the control necessity determination unit 134 determines whether or not the temperature difference between the region in which the temperature information of the region corresponding to the own device is the highest temperature and the region in which the temperature information of the other region is the lowest temperature is equal to or greater than a predetermined temperature difference in a plurality of regions divided from the cross-sectional region of the tube sheet portion 21 (step S203). If the temperature difference is equal to or greater than the predetermined temperature difference (step S203 / YES), the control necessity determination unit 134 determines that control is necessary and proceeds to step S204. On the other hand, if the temperature difference is less than the predetermined temperature difference (step S203 / NO), the control necessity determination unit 134 determines that control is unnecessary and returns the process to step S201.

[0091] When the process proceeds to step S204, the flow control unit 133B of the cooling control device 100B controls the flow rate of the cooling water 4 supplied to the furnace from the water spray 40 connected to the cooling control device 100B (step S204). At this time, the flow control unit 133B determines the control amount of the valve 50 based on the temperature information acquired by the temperature information acquisition unit 131B so that the temperature after control is less than a predetermined temperature or the temperature difference after control is less than a predetermined temperature difference.

[0092] After step S204, the cooling control device 100B returns the process to step S201, and repeats the processes of steps S201 to S204 until step S203 becomes NO.

[0093] As described above, the cooling control device 100B (100B-1 to 100B-4) according to the second embodiment includes a temperature information acquisition unit 131B that acquires temperature information indicating the temperature at the tube plate section 21 (inlet section) of the air preheater 20 (equipment) into which the exhaust gas 3 discharged from the fluidized incinerator 10 flows, a control necessity determination unit 134 that determines whether or not control is necessary to adjust the temperature in the region of the tube plate section 21 corresponding to the cooling control device 100B (its own device) based on the acquired temperature information, and a flow rate control unit 133B that, when it is determined that control is necessary, controls the flow rate of the cooling water 4 supplied to the furnace from the water sprays 40 (water supply devices) connected to the cooling control device 100B, among the multiple water sprays 40 (water supply devices) provided on the upper portion 12C of the freeboard section 12 of the fluidized incinerator 10, based on the acquired temperature information.

[0094] With this configuration, in the fluidized incinerator 10, the temperature of the exhaust gas 3 is adjusted by the water spray 40 in the upper part 12C of the freeboard section 12. This reduces the number of high-temperature or low-temperature parts locally generated in the exhaust gas 3, and prevents problems such as heat damage in the air preheater 20 and adhesion or blockage due to melting of incineration ash. In addition, in the fluidized incinerator 10, the cooling water 4 is supplied in a dispersed manner from a plurality of water sprays 40, so the flow rate of the cooling water 4 supplied from one water spray 40 is reduced, preventing the cooling water 4 from dripping onto the lower portion 12A of the freeboard section 12 and preventing the occurrence of low temperature areas. This makes it possible to prevent the occurrence of low temperature areas in the fluidized incinerator 10 from hindering the reduction of nitrous oxide emissions or the occurrence of high temperature areas, the occurrence of local low temperature and high temperature areas in the fluidized incinerator 10 from causing temperature differences in the exhaust gas 3, and the occurrence of problems due to the temperature of the exhaust gas in the air preheater 20 into which the exhaust gas 3 discharged from the fluidized incinerator 10 flows.

[0095] Therefore, the cooling control device 100B of the second embodiment makes it possible to prevent problems caused by the temperature of the exhaust gas 3 in the air preheater 20 (equipment) into which the exhaust gas 3 discharged from the fluidized incinerator 10 flows.

[0096] <2-4. Modifications> The second embodiment has been described above. Next, modified examples of the second embodiment described above will be described. Note that each modified example described below may be applied to the second embodiment alone, or may be applied to the second embodiment in combination. Also, each modified example may be applied in place of the configuration described in the second embodiment, or may be applied in addition to the configuration described in the second embodiment.

[0097] In the second embodiment described above, the flow control unit 133B of the cooling control device 100B may control the valve 50 connected to its own device, taking into consideration the amount of cooling water 4 supplied from the water spray 40 of the valve 50 controlled by the other cooling control device 100B and the total supply amount of cooling water 4 supplied from each water spray 40 to the inside of the fluidized incinerator 10. For example, the flow control unit 133B controls the amount of cooling water 4 supplied from each water spray 40 so that the total supply amount of cooling water 4 actually supplied from each water spray 40 does not exceed a preset total supply amount. In this case, the multiple cooling control devices 100B are connected to each other so as to be able to communicate with each other in order to share the amount of cooling water 4 supplied from the water spray 40 controlled by each cooling control device 100B with the other cooling control devices 100B. Also, the memory unit 120B of each cooling control device 100B stores information indicating a preset total amount of water supply. The flow control unit 133B controls the flow rate of the cooling water 4 supplied from the water spray 40 connected to the own device to the inside of the furnace based on the total supply water amount calculated from the amount of the cooling water 4 supplied from the water spray 40 controlled by the own device and the amount of the cooling water 4 supplied from the water spray 40 controlled by the other cooling control device 100B. Specifically, first, the flow control unit 133B of each cooling control device 100B acquires information indicating the amount of the cooling water 4 supplied from the water spray 40 controlled by the own device and information indicating the amount of the cooling water 4 supplied from the water spray 40 controlled by the other cooling control device 100B. After acquisition, the flow control unit 133B calculates the total supply water amount from the water amount indicated by each acquired information. After calculation, the flow control unit 133B compares the calculated total supply water amount with the total supply water amount indicated by the information stored in the memory unit 120. Then, the flow rate control unit 133B sends a control signal to each valve 50 to adjust the amount (flow rate) of cooling water 4 supplied from each water spray 40 so that the actual total supply water amount does not exceed a preset total supply water amount.

[0098] In the above-mentioned second embodiment, an example has been described in which the thermometer 60 is provided in each of the regions obtained by dividing the cross-sectional region of the tube sheet section 21 into a plurality of regions, but the present invention is not limited to such an example. For example, the thermometer 60 may be provided only in the region of the tube sheet section 21 that has the highest temperature and the region of the lowest temperature. The region of the tube sheet section 21 that has the highest temperature and the region of the lowest temperature can be detected in advance based on the analysis results of a thermal fluid analysis of the incineration equipment 1.

[0099] In the above-described second embodiment, an example has been described in which the number of divisions of the cross-sectional area of ​​the upper portion 12C of the freeboard portion 12, the number of water sprays 40, the number of valves 50, the number of divisions of the cross-sectional area of ​​the tube sheet portion 21, and the number of thermometers 60 are each four, but the present invention is not limited to such an example. Any number may be set according to the size of the fluidized incinerator 10 and the size of the air preheater 20. For example, the cross-sectional area of ​​the upper portion 12C of the freeboard portion 12 and the cross-sectional area of ​​the tube sheet portion 21 may each be divided into six, and six water sprays 40, six valves 50, and six thermometers 60 may each be provided.

[0100] <2-5.Additional Notes> Below, additional notes regarding aspects of the second embodiment are provided. (1) One aspect of the second embodiment is a cooling control device that includes a temperature information acquisition unit that acquires temperature information indicating the temperature at an inlet of an equipment through which exhaust gas discharged from a fluidized incinerator flows in, a control necessity determination unit that determines whether or not control is necessary to adjust the temperature in an area at the inlet corresponding to the device itself based on the acquired temperature information, and a flow rate control unit that controls the flow rate of cooling water supplied into the furnace from one of a plurality of water supply devices connected to the device itself, among multiple water supply devices provided above a freeboard section of the fluidized incinerator, based on the acquired temperature information when it is determined that the control is necessary.

[0101] (2) One aspect of the second embodiment is the cooling control device described in (1) above, wherein the control necessity determination unit may determine that the control is necessary when the temperature indicated by the temperature information of a region corresponding to the device itself is equal to or higher than a predetermined temperature in multiple regions divided by the inlet portion.

[0102] (3) One aspect of the second embodiment is the cooling control device described in (1) above, wherein the control necessity determination unit may determine that the control is necessary when, in a plurality of regions divided by the inlet portion, the temperature indicated by the temperature information of a region corresponding to the device itself is the highest temperature and the temperature difference between the region and another region indicated by the temperature information of the other region is the lowest temperature, is a predetermined temperature difference or more.

[0103] (4) One aspect of the second embodiment is a cooling control device as described in (1) or (2) above, wherein the flow control unit may control the flow rate of the cooling water supplied from the water supply device connected to the device itself so that the temperature indicated by the temperature information of the area corresponding to the device itself is less than a predetermined temperature in multiple areas divided by the inlet unit.

[0104] (5) One aspect of the second embodiment is a cooling control device as described in (1) or (3) above, wherein the flow control unit may control the flow rate of the cooling water supplied from the water supply device connected to the device itself so that, in multiple regions divided by the inlet portion, the temperature difference between the maximum temperature indicated by the temperature information of the region corresponding to the device itself and the minimum temperature indicated by other temperature information is less than a predetermined temperature difference.

[0105] (6) One aspect of the second embodiment is the cooling control device described in (1) above, wherein the flow rate control unit may control the flow rate of cooling water supplied from the water supply device connected to the device itself to the reactor based on a total supply water volume calculated from the volume of cooling water supplied from the water supply device controlled by the device itself and the volume of cooling water supplied from the water supply device controlled by another cooling control device.

[0106] (7) One aspect of the second embodiment is the cooling control device described in (1) above, wherein the equipment is an air preheater, and the inlet portion is a tube sheet portion of the air preheater.

[0107] (8) One aspect of the second embodiment is the cooling control device described in (1) above, wherein the fluidized bed incinerator may be an incinerator capable of incinerating so that at least one of the lower and middle parts of the freeboard section becomes a high temperature area.

[0108] (9) One aspect of the second embodiment is the cooling control device described in (1) above, wherein the water supply device may be a device provided in the canopy portion of the freeboard section of the fluidized bed incinerator.

[0109] (10) One aspect of the second embodiment may be an incineration facility equipped with the cooling control device described in (1) above.

[0110] (11) One aspect of the second embodiment is a cooling control method including: a temperature information acquisition process in which a computer acquires temperature information indicating the temperature at an inlet of an equipment through which exhaust gas discharged from a fluidized incinerator flows; a control necessity determination process in which, based on the acquired temperature information, a computer determines whether or not control is necessary to adjust the temperature in an area at the inlet corresponding to the equipment itself; and, if it is determined that the control is necessary, a flow rate control process in which, based on the acquired temperature information, a flow rate of cooling water supplied into the furnace from one of a plurality of water supply devices connected to the equipment itself, among the water supply devices provided above the freeboard section of the fluidized incinerator, is controlled.

[0111] (12) One aspect of the second embodiment is a program for causing a computer to function as: a temperature information acquisition means for acquiring temperature information indicating the temperature at an inlet of an equipment through which exhaust gas discharged from a fluidized incinerator flows; a control necessity determination means for determining, based on the acquired temperature information, whether or not control is necessary to adjust the temperature in the area at the inlet corresponding to the device itself; and, when it is determined that the control is necessary, a flow control means for controlling, based on the acquired temperature information, the flow rate of cooling water supplied into the furnace from one of a plurality of water supply devices connected to the device itself, among the water supply devices provided above the freeboard section of the fluidized incinerator.

[0112] The embodiment has been described above. In addition, a part or the whole of the cooling control device 100 in the above-mentioned embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in the recording medium may be read into a computer system and executed to realize the function. In addition, the "computer system" here includes hardware such as an OS and peripheral devices. In addition, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, an optical magnetic disk, a ROM, a CD-ROM, and a storage device such as a hard disk built into a computer system. Furthermore, the "computer-readable recording medium" may include a medium that dynamically holds a program for a short period of time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line, and a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client in that case. In addition, the above-mentioned program may be a program for realizing a part of the above-mentioned function, or may be a program that can realize the above-mentioned function in combination with a program already recorded in the computer system, or may be a program that is realized using a programmable logic device such as an FPGA (Field Programmable Gate Array).

[0113] Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to the above, and various design changes, etc. are possible within the scope that does not deviate from the gist of the present invention. [Explanation of symbols]

[0114] 1... incineration equipment, 2... incineration object, 3... exhaust gas, 4... cooling water, 10... fluidized bed incinerator, 11... sand layer section, 12... freeboard section, 12A... lower section, 12B... middle section, 12C... upper section, 20... air preheater, 21... tube sheet section, 30... duct, 40 (40A to 40D)... water spray, 50 (50A to 50D)... valve, 60 (60A' to 60D')... thermometer, 100, 100A, 100B (100B-1 to 100B-4)... cooling control device, 110, 110B... communication section, 120, 120B... memory section, 130, 130B... control section, 131, 131B... temperature information acquisition section, 132... control object selection section, 133, 133B... flow rate control section, 134... control necessity determination section

Claims

1. A temperature information acquisition unit that acquires temperature information indicating a temperature at an inlet of the equipment into which the exhaust gas discharged from the fluidized bed incinerator flows; A control target selection unit that selects a water supply device to be controlled from among a plurality of water supply devices provided on the upper part of the freeboard section of the fluidized bed incinerator based on the acquired temperature information; a flow rate control unit that controls a flow rate of the cooling water supplied from the water supply device selected as the control target into the furnace based on the acquired temperature information; A cooling control device comprising:

2. When the temperature information indicates that temperature adjustment of the inlet is required, the control object selection unit selects, as the control object, the water supply device that supplies the cooling water to an area in the furnace corresponding to an area of ​​the inlet that requires temperature adjustment. The cooling control device according to claim 1 .

3. the control target selection unit determines that temperature adjustment of the inlet is necessary when a region in which a temperature indicated by the temperature information is equal to or higher than a predetermined temperature exists among a plurality of regions obtained by dividing the inlet. The cooling control device according to claim 2 .

4. the control object selection unit selects, as the control object, the water supply device that supplies the cooling water to an area in the furnace corresponding to an area where the temperature indicated by the temperature information is equal to or higher than a predetermined temperature, among a plurality of areas divided by the inlet portion; The cooling control device according to claim 2 or 3.

5. the control target selection unit determines that temperature adjustment of the inlet is necessary when a temperature difference between a region in which the temperature information indicates a maximum temperature and a region in which the temperature information indicates a minimum temperature is equal to or greater than a predetermined temperature difference in a plurality of regions obtained by dividing the inlet. The cooling control device according to claim 2 .

6. the control object selection unit selects, as the control object, the water supply device that supplies the cooling water to an area in the furnace corresponding to an area in which the temperature indicated by the temperature information is the highest temperature, and the water supply device that supplies the cooling water to an area in the furnace corresponding to an area in which the temperature indicated by the temperature information is the lowest temperature, among the multiple areas divided by the inlet portion. The cooling control device according to claim 2 or 5.

7. a storage unit that stores correspondence information indicating a correspondence relationship between an area to which the water supply device supplies the cooling water and an area of ​​the inlet portion whose temperature changes as a result of the cooling water being supplied to the area; Further equipped with The control object selection unit determines an area in the furnace that corresponds to an area of ​​the inlet portion that requires temperature adjustment based on the correspondence information. The cooling control device according to claim 2 .

8. The flow rate control unit controls the flow rate of the cooling water supplied from the water supply device selected as the control target so that the temperature indicated by the temperature information in each of the plurality of regions obtained by dividing the inlet portion is less than a predetermined temperature. The cooling control device according to claim 1 or 2.

9. The flow rate control unit controls the flow rate of the cooling water supplied from the water supply device selected as the control target so that a temperature difference indicated by the temperature information in a plurality of regions obtained by dividing the inlet portion is less than a predetermined temperature difference. The cooling control device according to claim 1 or 2.

10. The equipment is an air preheater, The inlet portion is a tube sheet portion of the air preheater. The cooling control device according to claim 1 .

11. The fluidized bed incinerator is an incinerator capable of incinerating at least one of the lower and middle parts of the freeboard section in a high temperature region; The cooling control device according to claim 1 .

12. The water supply device is a device provided on the canopy of the freeboard section of the fluidized incinerator, The cooling control device according to claim 1 .

13. An incineration facility comprising the cooling control device according to claim 1.

14. The computer A temperature information acquisition process for acquiring temperature information indicating a temperature at an inlet of the equipment into which the exhaust gas discharged from the fluidized bed incinerator flows; A control target selection process for selecting a water supply device to be controlled from among a plurality of water supply devices provided on the upper part of the freeboard section of the fluidized bed incinerator based on the acquired temperature information; a flow rate control process for controlling a flow rate of the cooling water supplied from the water supply device selected as the control target into the reactor based on the acquired temperature information; A cooling control method comprising:

15. Computer, A temperature information acquisition means for acquiring temperature information indicating a temperature at an inlet of the equipment into which the exhaust gas discharged from the fluidized bed incinerator flows; A control target selection means for selecting a water supply device to be controlled from among a plurality of water supply devices provided on the upper part of the freeboard section of the fluidized bed incinerator based on the acquired temperature information; a flow rate control means for controlling a flow rate of the cooling water supplied from the water supply device selected as the control target into the reactor based on the acquired temperature information; A program to function as a

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