Ash treatment system and hydrogen concentration detection system

Abstract

To provide an ash treatment system which can prevent an occurrence of an unexpected explosion in an ash treatment unit, and a hydrogen concentration detection system.SOLUTION: An ash treatment system 1 for treating ashes removed from a combustion furnace A includes an ash treatment unit 3 which cools down the ashes with water and transports the cooled ashes, and a hydrogen sensor 41 which can measure a hydrogen concentration within the ash treatment unit 3.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an ash treatment system and a hydrogen concentration detection system.

Background Art

[0002] Conventionally, as a facility for cooling incineration ash discharged from an incinerator, there is known an ash extrusion device that cools ash in a tank in which cooling water is stored and extrudes the cooled ash.

[0003] In such an ash extrusion device, it is known that hydrogen gas is generated by the reaction between the cooling water made alkaline by cooling incineration ash (the main component is alkaline) and the metal (aluminum) contained in the incineration ash.

[0004] For example, Patent Document 1 below discloses an explosion prevention device that introduces outside air to the top of an ash discharge section to discharge hydrogen gas in a tank in an incineration ash cooling device including a sealed tank having an ash input section and an ash discharge section.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the explosion prevention device described in Patent Document 1 above, the concentration of hydrogen gas and the flow of hydrogen gas cannot be grasped.

[0007] Therefore, there are not a few cases where hydrogen gas generated in the tank does not flow toward the ash discharge section but flows into peripheral equipment connected to the incineration ash cooling device, and the flowing-in hydrogen stays in an unexpected place and causes an explosion accident. Also, since it is derived from garbage, it is difficult to predict the amount and timing of hydrogen generation.

[0008] The present invention provides an ash treatment system capable of avoiding the occurrence of hydrogen explosion in an ash treatment apparatus and a hydrogen concentration detection system.

Means for Solving the Problems

[0009] The present invention [1] is an ash treatment system for treating ash discharged from an incinerator, including an ash treatment apparatus that cools the ash with water and conveys the cooled ash, and a hydrogen sensor capable of measuring the hydrogen concentration in the ash treatment apparatus.

[0010] According to such a configuration, the hydrogen concentration in the ash treatment apparatus can be monitored by the hydrogen sensor.

[0011] Therefore, based on the hydrogen concentration measured by the hydrogen sensor, the risk of explosion caused by hydrogen gas can be evaluated, and a process for avoiding explosion can be executed.

[0012] As a result, the occurrence of hydrogen explosion in the ash treatment apparatus can be avoided.

[0013] The present invention [2] includes the ash treatment system of the above [1], wherein the ash treatment apparatus includes an ash extrusion device that cools the ash with water and extrudes the cooled ash, and an upstream conveyance path connected to the ash extrusion device for conveying the ash, and the hydrogen sensor is an upstream hydrogen sensor capable of measuring the hydrogen concentration in the upstream conveyance path.

[0014] According to such a configuration, even if hydrogen gas generated in the ash extrusion device flows into the upstream conveyance path, an increase in the hydrogen concentration in the upstream conveyance path can be detected by the upstream hydrogen sensor.

[0015] As a result, in the upstream conveyance path, a process for avoiding explosion can be executed.

[0016] The present invention [3] includes the ash treatment system of the above [2], wherein the upstream conveyance path is a fallen ash conveyance path for conveying fallen ash dropped from the incinerator to the ash extrusion device.

[0017] According to such a configuration, even if the hydrogen gas generated in the ash extrusion device flows into the falling ash conveyance path, the increase in the hydrogen concentration in the falling ash conveyance path can be detected by the upstream hydrogen sensor.

[0018] As a result, in the falling ash conveyance path, processing for avoiding an explosion can be executed.

[0019] The present invention [4] includes the ash treatment system of the above [2], in which the upstream conveyance path is a boiler-attached ash conveyance path for conveying the fly ash attached to the boiler to the ash extrusion device.

[0020] According to such a configuration, even if the hydrogen gas generated in the ash extrusion device flows into the boiler-attached ash conveyance path, the increase in the hydrogen concentration in the boiler-attached ash conveyance path can be detected by the upstream hydrogen sensor.

[0021] As a result, in the boiler-attached ash conveyance path, processing for avoiding an explosion can be executed.

[0022] The present invention [5] includes the ash treatment system of any one of the above [1] to [4], in which the ash treatment device includes an ash extrusion device that cools the ash with water and extrudes the cooled ash, and a downstream conveyance path for conveying the ash extruded from the ash extrusion device, and the hydrogen sensor is a downstream hydrogen sensor capable of measuring the hydrogen concentration in the downstream conveyance path.

[0023] According to such a configuration, the hydrogen generated from the wet ash in the downstream conveyance path can be monitored by the downstream hydrogen sensor.

[0024] Therefore, also in the downstream conveyance path, processing for avoiding an explosion can be executed.

[0025] Further, when the hydrogen concentration in the downstream conveyance path excessively increases, such as when the hydrogen gas generated in the ash extrusion device flows into the downstream conveyance path, processing for avoiding an explosion can be executed in the same manner as in the upstream conveyance path.

[0026] The present invention [6] further includes a control device capable of receiving a signal from the hydrogen sensor in the ash treatment system, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device executes a ventilation process for ventilating the upstream conveyance path, and includes any one of the ash treatment systems of [2] to [4] above.

[0027] According to such a configuration, when the hydrogen concentration measured by the upstream hydrogen sensor exceeds the threshold value and the risk of explosion due to hydrogen gas in the upstream conveyance path increases, the upstream conveyance path can be ventilated to avoid explosion.

[0028] The present invention [7] further includes a control device capable of receiving a signal from the hydrogen sensor in the ash treatment system, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device executes a ventilation process for ventilating the downstream conveyance path, and includes the ash treatment system of [5] above.

[0029] According to such a configuration, when the hydrogen concentration measured by the downstream hydrogen sensor exceeds the threshold value and the risk of explosion due to hydrogen gas in the downstream conveyance path increases, the downstream conveyance path can be ventilated to avoid explosion.

[0030] The present invention [8] is such that the hydrogen sensor is a wireless hydrogen detection device, the ash treatment system includes a plurality of the upstream hydrogen sensors, and the plurality of the upstream hydrogen sensors continuously measure the hydrogen concentrations at a plurality of locations separated from each other in the upstream conveyance path, and includes any one of the ash treatment systems of [2] to [4] above.

[0031] According to such a configuration, by continuously measuring the hydrogen concentrations at a plurality of locations separated from each other, the flow of hydrogen gas in the upstream conveyance path can be estimated.

[0032] The present invention [9] includes the ash treatment system described in [5] above, wherein the hydrogen sensor is a wireless hydrogen detection device, the ash treatment system includes a plurality of the downstream hydrogen sensors, and the plurality of the downstream hydrogen sensors continuously measure hydrogen concentrations at a plurality of locations separated from each other in the downstream conveyance path.

[0033] According to such a configuration, by continuously measuring hydrogen concentrations at a plurality of locations separated from each other, the flow of hydrogen gas in the downstream conveyance path can be estimated.

[0034] The present invention

[10] includes the ash treatment system according to any one of [2] to [9] above, wherein the ash extrusion device has an inlet for receiving the ash, and the ash treatment system further includes an inlet hydrogen sensor capable of measuring the hydrogen concentration in the inlet of the ash extrusion device.

[0035] According to such a configuration, the hydrogen concentration in the ash extrusion device, which is assumed to be the main source of hydrogen gas, can be monitored by the inlet hydrogen sensor.

[0036] The present invention

[11] includes the ash treatment system according to any one of [2] to

[10] above, wherein the ash extrusion device has a cooling water tank for immersing the ash in water for cooling.

[0037] The present invention

[12] is an ash treatment system according to any one of [2] to

[10] above, wherein the ash extrusion device has a water spraying means for spraying water on the ash to cool the ash.

[0038] The present invention

[13] includes the ash treatment system described in [1] above, wherein the ash treatment device includes a water-cooled conveyor for cooling the ash with water and conveying the cooled ash, and the hydrogen sensor is capable of measuring the hydrogen concentration in the water-cooled conveyor.

[0039] According to such a configuration, when the ash is cooled by the water-cooled conveyor, the hydrogen concentration in the water-cooled conveyor, which is assumed to be the main source of hydrogen gas, can be monitored.

[0040] The present invention

[14] is a hydrogen concentration detection system for detecting the hydrogen concentration in an ash treatment device for treating ash discharged from an incinerator, and includes a hydrogen sensor capable of measuring the hydrogen concentration and a control device capable of receiving a signal from the hydrogen sensor.

[0041] According to such a configuration, the hydrogen concentration in the ash treatment device can be monitored by the hydrogen sensor.

[0042] Therefore, based on the hydrogen concentration measured by the hydrogen sensor, the risk of explosion caused by hydrogen gas can be evaluated, and a process for avoiding explosion can be executed.

[0043] As a result, the occurrence of an unexpected explosion in the ash treatment device can be suppressed.

[0044] The present invention

[15] includes the hydrogen concentration detection system of the above

[14] , wherein the ash treatment device includes an ash extrusion device that cools the ash with water and extrudes the cooled ash, and an upstream conveyance path connected to the ash extrusion device for conveying the ash, and the hydrogen sensor is an upstream hydrogen sensor capable of measuring the hydrogen concentration in the upstream conveyance path.

[0045] According to such a configuration, even if hydrogen gas generated in the ash extrusion device flows into the upstream conveyance path, an increase in the hydrogen concentration in the upstream conveyance path can be detected by the upstream hydrogen sensor.

[0046] As a result, in the upstream conveyance path, a process for avoiding explosion can be executed.

[0047] The present invention

[16] includes the hydrogen concentration detection system of the above

[14] , wherein the ash treatment device includes an ash extrusion device that cools the ash with water and extrudes the cooled ash, and a downstream conveyance path connected to the ash extrusion device for conveying the ash extruded from the ash extrusion device, and the hydrogen sensor is a downstream hydrogen sensor capable of measuring the hydrogen concentration in the downstream conveyance path.

[0048] According to such a configuration, hydrogen generated from the wet ash in the downstream conveyance path can be monitored by the downstream hydrogen sensor.

[0049] Further, when the hydrogen concentration in the downstream conveyance path rises excessively, such as when hydrogen gas generated by the ash extrusion device flows into the downstream conveyance path, processing for avoiding an explosion can be executed, similar to the upstream conveyance path.

[0050] The present invention

[17] includes the hydrogen concentration detection system according to

[15] or

[16] above, further comprising a receiving port hydrogen sensor capable of measuring the hydrogen concentration in the receiving port of the ash extrusion device, where the ash extrusion device has a receiving port for receiving the ash, and the hydrogen concentration detection system includes the receiving port hydrogen sensor.

[0051] According to such a configuration, the hydrogen concentration in the ash extrusion device, which is assumed to be the main source of hydrogen gas, can be monitored by the receiving port hydrogen sensor.

Effect of the Invention

[0052] According to the ash treatment system and the hydrogen concentration detection system of the present invention, the occurrence of hydrogen explosion in the ash treatment device can be avoided.

Brief Description of the Drawings

[0053]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiment for Carrying out the Invention

[0054] 1. Ash treatment system As shown in FIG. 1, the ash treatment system 1 treats the ash discharged from the incinerator A in a waste incineration facility. Specifically, the ash treatment system 1 cools the ash discharged from the incinerator A and conveys it to the ash pit B. The ash pit B stores the ash cooled by the ash treatment system 1. The ash contains at least main ash. The ash may contain fly ash. The main ash contains incineration ash. The main ash may contain the ash that has fallen through the gaps of the grate of the incinerator A.

[0055] The ash treatment system 1 includes a chute 2 (see FIG. 2), an ash treatment device 3, and a hydrogen concentration detection system 4.

[0056] In the following description, as shown in FIG. 2, the case where the ash treatment system 1 is applied to a stoker (grate) type incinerator will be taken as an example for explanation. The stoker type incinerator sequentially includes a drying grate A11, a combustion grate A12, and a post-combustion grate A13 from the waste inlet A1 to the ash outlet A2.

[0057] (1) Chute The chute 2 guides the incineration ash to the ash treatment device 3. Specifically, the chute 2 guides the incineration ash to an ash extrusion device 31 described later. One end of the chute 2 is connected to the outlet A2 of the incinerator A. The other end of the chute 2 is connected to the inlet 311A (see FIG. 3) of the ash extrusion device 31.

[0058] (2) Ash treatment device The ash treatment device 3 cools the ash with water and conveys the cooled ash toward the ash pit B. Specifically, the ash treatment device 3 includes an ash extrusion device 31, a fallen ash conveyance path 32 as an example of an upstream conveyance path, a boiler-attached ash conveyance path 33 as an example of an upstream conveyance path, and a downstream conveyance path 34.

[0059] (2-1) Ash Extrusion Device As shown in FIG. 3, the ash extrusion device 31 cools the ash with water and extrudes the cooled ash. In the present embodiment, the ash extrusion device 31 is a water-sealed type. Specifically, the ash extrusion device 31 includes a cooling water tank 311, a scraper 312, and a scraper driving device 313.

[0060] The cooling water tank 311 is a water tank for immersing the ash in water for cooling. The cooling water tank 311 has a substantially box shape extending in the horizontal direction. Cooling water W is stored in the cooling water tank 311. The ash that has passed through the chute 2 and entered the cooling water tank 311 is cooled by the cooling water W. The cooling water tank 311 has an inlet 311A and an outlet 311B. That is, the ash extrusion device 31 has an inlet 311A.

[0061] The inlet 311A is disposed on the upper wall of the cooling water tank 311. The inlet 311A is located above the water level L of the cooling water W. The inlet 311A can receive the ash. The ash that has passed through the chute 2 enters the cooling water tank 311 through the inlet 311A.

[0062] The outlet 311B is disposed at one end of the cooling water tank 311 in the horizontal direction. The outlet 311B is disposed away from the inlet 311A in the horizontal direction. The outlet 311B is located above the water level L of the cooling water W. The ash immersed in the cooling water W is discharged out of the cooling water tank 311 through the outlet 311B.

[0063] The bottom wall 3111 of the cooling water tank 311 has a deepest part 3111A and an inclined part 3111B. The deepest part 3111A is arranged away below the receiving port 311A. The water depth of the cooling water W is the deepest at the deepest part 3111A. The inclined part 3111B inclines upward as it approaches the discharge port 311B from the deepest part 3111A. The ash in the cooling water tank 311 is pushed by the scraper 312 from the deepest part 3111A toward the discharge port 311B, climbs the inclined part 3111B, and is discharged from the discharge port 311B.

[0064] The scraper 312 is arranged in the cooling water tank 311. The scraper 312 extrudes the ash in the cooling water tank 311. Specifically, the scraper 312 pushes the ash on the deepest part 3111A toward the discharge port 311B. The scraper 312 can repeatedly move between a first position (refer to the virtual line in FIG. 3) and a second position (refer to the solid line in FIG. 3). When the scraper 312 moves from the first position to the second position, it pushes the ash on the deepest part 3111A toward the discharge port 311B.

[0065] The scraper drive device 313 drives the scraper 312. Examples of the scraper drive device 313 include a hydraulic cylinder.

[0066] (2-2) Conveyor path for fallen ash As shown in FIG. 2, the conveyor path 32 for fallen ash is a conveyor path for conveying fallen ash to the ash extrusion device 31. The conveyor path 32 for fallen ash is arranged below the incinerator A. The conveyor path 32 for fallen ash is arranged below the drying grate A11, the combustion grate A12, and the afterburning grate A13. The conveyor path 32 for fallen ash can receive the fallen ash dropped from each of the drying grate A11, the combustion grate A12, and the afterburning grate A13. The conveyor path 32 for fallen ash is connected to the ash extrusion device 31 via, for example, the chute 2. A drag chain conveyor is arranged in the conveyor path 32 for fallen ash. The fallen ash in the conveyor path 32 for fallen ash is conveyed toward the ash extrusion device 31 by the drag chain conveyor.

[0067] (2-3) Conveyor path for boiler-attached ash The boiler-attached ash conveying path 33 is a conveying path for conveying the fly ash attached to the boiler 5 to the ash extrusion device 31. The boiler-attached ash conveying path 33 is connected to the ash extrusion device 31. The boiler 5 is provided in an exhaust gas treatment device for treating the exhaust gas discharged from the incinerator A. The boiler 5 boils water by utilizing the heat of the exhaust gas. The steam obtained in the boiler 5 is used, for example, for power generation. Here, fly ash contained in the exhaust gas adheres to the boiler 5. The fly ash attached to the boiler 5 is removed, for example, by soot blowing, and is conveyed through the boiler-attached ash conveying path 33 to the ash extrusion device 31. A scraper conveyor is arranged in the boiler-attached ash conveying path 33. The fly ash in the boiler-attached ash conveying path 33 is conveyed by the scraper conveyor toward the ash extrusion device 31.

[0068] (2-4) Downstream conveying path The downstream conveying path 34 is a conveying path for conveying the ash extruded from the ash extrusion device 31 toward the ash pit B. The downstream conveying path 34 can receive the ash extruded from the ash extrusion device 31. A scraper conveyor is arranged in the downstream conveying path 34. The ash in the downstream conveying path 34 is conveyed by the scraper conveyor toward the ash pit B.

[0069] (3) Hydrogen concentration detection system The hydrogen concentration detection system 4 detects the hydrogen concentration in the ash treatment device 3.

[0070] In the ash treatment device 3, since the ash (the main component is alkaline) is cooled by the cooling water W (see FIG. 3), the cooling water W becomes alkaline. In particular, when the cooling water W is circulated, the alkalinity of the cooling water W becomes stronger. Then, the metal (for example, aluminum) contained in the ash reacts with the alkaline cooling water W, and hydrogen is generated. If the generated hydrogen stays, there is a possibility that an explosion caused by the staying hydrogen may occur.

[0071] Therefore, in the present invention, the hydrogen concentration detection system 4 monitors the hydrogen concentration in the ash treatment device 3. Specifically, the hydrogen concentration detection system 4 includes a plurality of hydrogen sensors 41 and a control device 42. That is, the ash treatment system 1 includes a plurality of hydrogen sensors 41.

[0072] (3-1) Hydrogen Sensor The plurality of hydrogen sensors 41 can measure the hydrogen concentration in the ash treatment device 3. That is, the hydrogen concentration detection system 4 can measure the hydrogen concentration at a plurality of locations in the ash treatment device 3. Specifically, the plurality of hydrogen sensors 41 include a plurality of upstream hydrogen sensors 41A, 41B, 41C, 41D, a plurality of downstream hydrogen sensors 41E, 41F, and an inlet hydrogen sensor 41G.

[0073] The upstream hydrogen sensors 41A, 41B can measure the hydrogen concentration in the fly ash conveying path 32. The upstream hydrogen sensors 41A, 41B are arranged apart from each other in the direction in which the fly ash conveying path 32 extends. Thereby, the upstream hydrogen sensors 41A, 41B continuously measure the hydrogen concentrations at two locations separated from each other in the fly ash conveying path 32. Note that the number of hydrogen sensors 41 attached to the fly ash conveying path 32 is not limited. The number of hydrogen sensors 41 attached to the fly ash conveying path 32 may be one, or may be three or more.

[0074] The upstream hydrogen sensors 41C, 41D can measure the hydrogen concentration in the boiler-attached ash conveying path 33. The upstream hydrogen sensors 41C, 41D are arranged apart from each other in the direction in which the boiler-attached ash conveying path 33 extends. Thereby, the upstream hydrogen sensors 41C, 41D continuously measure the hydrogen concentrations at two locations separated from each other in the boiler-attached ash conveying path 33. Note that the number of hydrogen sensors 41 attached to the boiler-attached ash conveying path 33 is not limited. The number of hydrogen sensors 41 attached to the boiler-attached ash conveying path 33 may be one, or may be three or more.

[0075] The downstream hydrogen sensors 41E and 41F can measure the hydrogen concentration in the downstream conveyance path 34. The downstream hydrogen sensors 41E and 41F are arranged apart from each other in the direction in which the downstream conveyance path 34 extends. Thereby, the downstream hydrogen sensors 41E and 41F continuously measure the hydrogen concentrations at two locations separated from each other in the downstream conveyance path 34. Note that the number of hydrogen sensors 41 attached to the downstream conveyance path 34 is not limited. The number of hydrogen sensors 41 attached to the downstream conveyance path 34 may be one, or may be three or more.

[0076] As shown in FIG. 3, the inlet hydrogen sensor 41G can measure the hydrogen concentration in the inlet 311A of the ash extrusion device 31. The inlet hydrogen sensor 41G continuously measures the hydrogen concentration in the inlet 311A of the ash extrusion device 31.

[0077] Each of the plurality of hydrogen sensors 41 is preferably a wireless hydrogen detection device. Each of the plurality of hydrogen sensors 41 may be a wired hydrogen detection device. The generated hydrogen stays in an unexpected location in the ash treatment device 3. Therefore, it is preferable to perform multi-point monitoring of the hydrogen concentration using a small wireless hydrogen sensor and a communication device that can be easily attached and measured anywhere. By performing multi-point monitoring of the hydrogen concentration, it is possible to predict the retention status and accident risk of hydrogen from the variation tendency of the hydrogen concentration at each installation location of the hydrogen sensor. Then, when it is determined that the explosion risk has increased, explosion can be avoided by measures such as promoting ventilation of the entire facility or forcibly ventilating the location where the explosion risk has increased pinpoint. Note that when it is determined that the hydrogen concentration has gradually increased and the explosion risk has increased, it is preferable to promote ventilation of the entire facility, and when it is determined that the explosion risk has increased due to a rapid increase in the hydrogen concentration, it is preferable to forcibly ventilate (such as blowing + opening to the atmosphere) the location where the explosion risk has increased pinpoint.

[0078] (3-2) Control device As shown in FIGS. 2 and 3, the control device 42 can receive signals from each of the plurality of hydrogen sensors 41.

[0079] As shown in FIG. 4, the ash treatment system 1 may further include a display device 51, a warning light 52, a fan 53 for the falling ash conveyance path 32, a fan 54 for the boiler-attached ash conveyance path 33, a fan 55 for the downstream conveyance path 34, a fan 56 for the ash extrusion device 31, and a post-combustion grate drive device 57.

[0080] The display device 51 is disposed, for example, in the control room of the waste incineration facility. The warning light 52 is attached to, for example, the ash extrusion device 31. The fan 53 is attached to the falling ash conveyance path 32. The fan 54 is attached to the boiler-attached ash conveyance path 33. The fan 55 is attached to the downstream conveyance path 34. The fan 56 is attached to the ash extrusion device 31. The post-combustion grate drive device 57 is connected to the post-combustion grate A13. The post-combustion grate drive device 57 drives the post-combustion grate A13 of the incinerator A.

[0081] The control device 42 controls the display device 51, the warning light 52, the fan 53 for the falling ash conveyance path 32, the fan 54 for the boiler-attached ash conveyance path 33, the fan 55 for the downstream conveyance path 34, the fan 56 for the ash extrusion device 31, the post-combustion grate drive device 57, and the scraper drive device 313 by wireless connection or wired connection. Note that the control device 42 may be integrated with other control devices of the incinerator.

[0082] As shown in FIG. 5, the control device 42 monitors the hydrogen concentration in the falling ash conveyance path 32 based on signals from the upstream hydrogen sensors 41A and 41B (see FIG. 2). When the hydrogen concentration in the falling ash conveyance path 32 exceeds a threshold value (first threshold value) (S1: YES), the control device 42 performs ventilation processing on the falling ash conveyance path 32 (S2). In the ventilation processing of the falling ash conveyance path 32, the control device 42 operates the fan 53 (see FIG. 4) to ventilate the inside of the falling ash conveyance path 32.

[0083] In addition, in parallel with the processing for the falling ash conveyance path 32, the control device 42 also monitors the internal hydrogen concentration for the boiler-attached ash conveyance path 33 and the downstream conveyance path 34, and performs ventilation processing when the hydrogen concentration exceeds the threshold value.

[0084] Specifically, the control device 42 monitors the hydrogen concentration in the boiler adherent ash conveyance path 33 based on signals from the upstream hydrogen sensors 41C and 41D (see FIG. 2). When the hydrogen concentration in the boiler adherent ash conveyance path 33 exceeds a threshold value (second threshold value), the control device 42 performs ventilation processing on the boiler adherent ash conveyance path 33. In the ventilation processing of the boiler adherent ash conveyance path 33, the control device 42 operates the fan 54 (see FIG. 4) to ventilate the inside of the boiler adherent ash conveyance path 33. The second threshold value can be set independently of the first threshold value. The second threshold value may be the same as or different from the first threshold value.

[0085] Further, the control device 42 monitors the hydrogen concentration in the downstream conveyance path 34 based on signals from the downstream hydrogen sensors 41E and 41F (see FIG. 2). When the hydrogen concentration in the downstream conveyance path 34 exceeds a threshold value (third threshold value), the control device 42 performs ventilation processing on the downstream conveyance path 34. In the ventilation processing of the downstream conveyance path 34, the control device 42 operates the fan 55 (see FIG. 4) to ventilate the inside of the downstream conveyance path 34. The third threshold value can be set independently of the first threshold value and the second threshold value. The third threshold value may be the same as or different from the first threshold value and the second threshold value. The third threshold value is preferably higher than the first threshold value and the second threshold value.

[0086] Then, when the hydrogen concentration becomes equal to or lower than the safety value (S1: NO, S3: YES, S4: YES), the control device 42 stops the ventilation processing (S5).

[0087] Also, as shown in FIG. 6, the control device 42 monitors the hydrogen concentration in the inlet 311A of the ash extrusion device 31 based on a signal from the inlet hydrogen sensor 41G (see FIG. 3). When the hydrogen concentration detected by the inlet hydrogen sensor 41G exceeds a threshold value (fourth threshold value) (S11: YES), the control device 42 executes a warning process (S12). The fourth threshold value can be set independently of the first threshold value, the second threshold value, and the third threshold value. The fourth threshold value may be the same as or different from the first threshold value, the second threshold value, and the third threshold value. The fourth threshold value is preferably higher than the first threshold value, the second threshold value, and the third threshold value.

[0088] Here, when the hydrogen concentration detected by the inlet hydrogen sensor 41G exceeds the threshold value (the fourth threshold value) and adheres to and grows on the inner wall of the chute 2 (see FIG. 3), a state called a "bridge" occurs where the inside of the chute 2 is blocked. If the chute 2 is blocked, hydrogen in the ash extrusion device 31 that would have escaped to the incinerator side when the chute 2 was not blocked may be retained in the vicinity of the inlet 311A.

[0089] Therefore, in the warning process, the control device 42, for example, displays on the display device 51 (see FIG. 4) that there is a possibility that the chute 2 is blocked, and operates the warning lamp 52 (see FIG. 4) to warn of the blockage of the chute 2.

[0090] In addition, when the hydrogen concentration detected by the inlet hydrogen sensor 41G exceeds the threshold value, it is also conceivable that the alkalinity of the cooling water is excessively strong and the amount of hydrogen generated is increasing.

[0091] Therefore, the control device 42 may execute a water injection process of adding cooling water together with the warning process (S12). Note that the water injection process may be executed independently of the warning process (S12) based on different threshold values and safety values from the warning process (S12).

[0092] When the hydrogen concentration becomes equal to or lower than the safety value (S11: NO, S13: YES, S14: YES), the control device 42 cancels the warning (S15).

[0093] Note that the hydrogen concentration distribution for each location of the hydrogen sensor, the threshold value of the hydrogen concentration, and the safety value may be determined by machine learning or the like.

[0094] 2. Operational Effects (1) According to the ash treatment system 1 and the hydrogen concentration detection system 4, as shown in FIG. 2, the hydrogen concentrations at a plurality of points in the ash treatment device 3 can be monitored by the plurality of hydrogen sensors 41.

[0095] Therefore, based on the hydrogen concentration measured by the hydrogen sensor 41, the risk of explosion caused by hydrogen gas can be evaluated, and processes for avoiding explosion can be executed.

[0096] As a result, the occurrence of hydrogen explosion in the ash treatment apparatus 3 can be avoided.

[0097] (2) According to the ash treatment system 1 and the hydrogen concentration detection system 4, as shown in FIG. 2, the ash treatment apparatus 3 includes an ash extrusion device 31, a falling ash conveyance path 32 and a boiler-attached ash conveyance path 33 as upstream conveyance paths connected to the ash extrusion device 31. The upstream hydrogen sensors 41A and 41B can measure the hydrogen concentration in the falling ash conveyance path 32. The upstream hydrogen sensors 41C and 41D can measure the hydrogen concentration in the boiler-attached ash conveyance path 33.

[0098] Thereby, even if the hydrogen gas generated in the ash extrusion device 31 flows into the falling ash conveyance path 32, the increase in the hydrogen concentration in the falling ash conveyance path 32 can be detected by the upstream hydrogen sensors 41A and 41B.

[0099] Also, even if the hydrogen gas generated in the ash extrusion device 31 flows into the boiler-attached ash conveyance path 33, the increase in the hydrogen concentration in the boiler-attached ash conveyance path 33 can be detected by the upstream hydrogen sensors 41C and 41D.

[0100] As a result, in the falling ash conveyance path 32 and the boiler-attached ash conveyance path 33, processes for avoiding explosion can be executed.

[0101] (3) According to the ash treatment system 1 and the hydrogen concentration detection system 4, as shown in FIG. 2, the ash treatment apparatus 3 includes a downstream conveyance path 34 that conveys the ash extruded from the ash extrusion device 31. The downstream hydrogen sensors 41E and 41F can measure the hydrogen concentration in the downstream conveyance path 34.

[0102] Thereby, the hydrogen generated from the wet ash in the downstream conveyance path 34 can be monitored by the downstream hydrogen sensors 41E and 41F.

[0103] Also, when the hydrogen gas generated by the ash extrusion device 31 flows into the downstream conveyance path 34, or when the hydrogen concentration in the downstream conveyance path 34 rises excessively, the same explosion avoidance processing as that for the upstream conveyance path (the falling ash conveyance path 32 and the boiler-attached ash conveyance path 33) can be executed.

[0104] (4) According to the ash treatment system 1 and the hydrogen concentration detection system 4, as shown in FIGS. 2 and 5, when the hydrogen concentration in the falling ash conveyance path 32 exceeds the threshold value (S1: YES), the control device 42 executes ventilation processing for the falling ash conveyance path 32 (S2).

[0105] Therefore, when the hydrogen concentration measured by the upstream hydrogen sensors 41A and 41B exceeds the threshold value and the risk of explosion due to hydrogen gas in the falling ash conveyance path 32 increases, the falling ash conveyance path 32 can be ventilated to avoid explosion.

[0106] Similarly, when the hydrogen concentration in the boiler-attached ash conveyance path 33 exceeds the threshold value (S1: YES), the control device 42 executes ventilation processing for the boiler-attached ash conveyance path 33 (S2).

[0107] Therefore, when the hydrogen concentration measured by the upstream hydrogen sensors 41C and 41D exceeds the threshold value and the risk of explosion due to hydrogen gas in the boiler-attached ash conveyance path 33 increases, the boiler-attached ash conveyance path 33 can be ventilated to avoid explosion.

[0108] (5) According to the ash treatment system 1 and the hydrogen concentration detection system 4, as shown in FIGS. 2 and 5, when the hydrogen concentration in the downstream conveyance path 34 exceeds the threshold value (S1: YES), the control device 42 executes ventilation processing for the downstream conveyance path 34 (S2).

[0109] Therefore, when the hydrogen concentration measured by the downstream hydrogen sensors 41E and 41F exceeds the threshold value and the risk of explosion due to hydrogen gas in the downstream conveyance path 34 increases, the downstream conveyance path 34 can be ventilated to avoid explosion.

[0110] (6) According to the ash treatment system 1 and the hydrogen concentration detection system 4, each hydrogen sensor 41 is a wireless hydrogen detection device. As shown in FIG. 2, the upstream hydrogen sensors 41A and 41B continuously measure the hydrogen concentrations at two locations separated from each other in the fly ash conveyance path 32.

[0111] Thereby, the flow of hydrogen gas in the fly ash conveyance path 32 can be estimated.

[0112] Also, the upstream hydrogen sensors 41C and 41D continuously measure the hydrogen concentrations at two locations separated from each other in the boiler adherent ash conveyance path 33.

[0113] Thereby, the flow of hydrogen gas in the boiler adherent ash conveyance path 33 can be estimated.

[0114] (7) According to the ash treatment system 1 and the hydrogen concentration detection system 4, as shown in FIG. 2, the downstream hydrogen sensors 41E and 41F continuously measure the hydrogen concentrations at two locations separated from each other in the downstream conveyance path 34.

[0115] Thereby, the flow of hydrogen gas in the downstream conveyance path 34 can be estimated.

[0116] (8) According to the ash treatment system 1 and the hydrogen concentration detection system 4, as shown in FIG. 3, the inlet hydrogen sensor 41G can measure the hydrogen concentration in the inlet 311A of the ash extrusion device 31.

[0117] Therefore, the inlet hydrogen sensor 41G can monitor the hydrogen concentration in the ash extrusion device 31, which is assumed to be the main hydrogen gas generation source.

[0118] 3. Modification Example The following describes a modification example. In the modification example, the same members as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0119] (1) The ash treatment device 3 may not have the boiler-attached ash conveyance path 33. The boiler-attached ash (fly ash) may be conveyed to a fly ash treatment facility separate from the ash treatment device 3 and may be solidified in the fly ash treatment facility.

[0120] (2) As shown in FIG. 7, the ash extrusion device 31 may be of the water spraying type. Specifically, the ash extrusion device 31 sprays cooling water onto the ash in the cooling water tank 311 without immersing the ash in the cooling water in the cooling water tank 311. The ash extrusion device 31 has a nozzle 61 as an example of the water spraying means. The nozzle 61 sprays water onto the ash in the cooling water tank 311 to cool the ash. The cooled ash is pushed by the scraper 312 and discharged from the discharge port 311B.

[0121] (3) Instead of the ash extrusion device 31, the ash treatment device 3 may be provided with a water-cooled conveyor 71. As shown in FIG. 8, the water-cooled conveyor 71 may be of the water-sealed type in which the ash is immersed in the cooling water W stored in the water-cooled conveyor 71 for cooling, or as shown in FIG. 9, it may be of the water spraying type in which the ash is cooled by water spraying from the nozzle 72.

[0122] The water-cooled conveyor 71 cools the ash with water and conveys the cooled ash. A drag chain conveyor is arranged in the water-cooled conveyor 71. The ash in the water-cooled conveyor 71 is conveyed by the drag chain conveyor toward the ash pit B (see FIG. 1).

[0123] The inlet hydrogen sensor 41G may be able to measure the hydrogen concentration in the inlet 311A of the water-cooled conveyor 71.

[0124] According to this modification, when the water-cooled conveyor 71 is provided instead of the ash extrusion device 31 and the ash is cooled by the water-cooled conveyor 71, the inlet hydrogen sensor 41G can monitor the hydrogen concentration in the water-cooled conveyor 71, which is assumed to be the main source of hydrogen gas.

[0125] (4) The water-cooled conveyor 71 may be continuous with the falling ash conveyance path 32 (see FIG. 2).

[0126] (5) When the hydrogen concentration detected by the inlet hydrogen sensor 41G (see FIG. 3) exceeds the threshold value, the control device 42 may control the afterburning fire grate drive device 57 to adjust the drive speed of the afterburning fire grate A13 (see FIG. 2) as shown in FIG. 4.

[0127] According to this modification, based on the hydrogen concentration detected by the inlet hydrogen sensor 41G, the drive speed of the afterburning fire grate A13 can be adjusted so that the generation amount of hydrogen gas does not increase excessively.

[0128] Specifically, when the hydrogen concentration detected by the inlet hydrogen sensor 41G exceeds the threshold value, the control device 42 controls the afterburning fire grate drive device 57 to slow down the drive speed of the afterburning fire grate A13.

[0129] By slowing down the drive speed of the afterburning fire grate A13, the amount of incineration ash supplied to the ash extrusion device 31 per unit time can be reduced, and the amount of hydrogen generated by the ash extrusion device 31 can be reduced.

[0130] (6) When the hydrogen concentration detected by the inlet hydrogen sensor 41G (see FIG. 3) exceeds the threshold value, the control device 42 may control the scraper drive device 313 to adjust the drive timing of the scraper 312 (see FIG. 3).

[0131] According to this modification, based on the hydrogen concentration detected by the inlet hydrogen sensor 41G, the drive timing of the scraper 312 can be adjusted so that the generation amount of hydrogen gas does not increase excessively.

[0132] Specifically, when the hydrogen concentration detected by the inlet hydrogen sensor 41G exceeds the threshold value, the control device 42 controls the scraper drive device 313 to adjust the drive timing of the scraper 312 so that the drive interval of the scraper 312 becomes longer than the set value. Also, the control device 42 controls the scraper drive device 313 to adjust the drive timing of the scraper 312 so that the drive timing of the scraper 312 is delayed with respect to the drive timing of the afterburning fire grate drive device 57.

[0133] Even in Modifications (1) to (6), the same operational effects as those of the embodiment can be obtained.

Explanation of Signs

[0134] 1 Ash treatment system 3 Ash treatment device 31 Ash extrusion device 311 Cooling water tank 311A Inlet 32 Fallen ash conveyance path (an example of an upstream conveyance path) 33 Boiler-attached ash conveyance path (an example of an upstream conveyance path) 34 Downstream conveyance path 4 Hydrogen concentration detection system 41 Hydrogen sensor 41A to 41D Upstream hydrogen sensors 41E, 41F Downstream hydrogen sensors 41G Inlet hydrogen sensor 42 Control device 61 Nozzle (an example of a water spraying means) 71 Water-cooled conveyor A Incinerator

Claims

1. An ash treatment system for treating ash discharged from an incinerator, comprising: an ash treatment device configured to cool the ash with water and convey the cooled ash; and a hydrogen sensor capable of measuring the hydrogen concentration in the ash treatment device. The ash treatment system according to claim 1.

2. The ash treatment device includes: an ash extrusion device configured to cool the ash with water and extrude the cooled ash; and an upstream conveyance path connected to the ash extrusion device for conveying the ash, and the hydrogen sensor is an upstream hydrogen sensor capable of measuring the hydrogen concentration in the upstream conveyance path. The ash treatment system according to claim 1.

3. The upstream conveyance path is a fallen ash conveyance path for conveying fallen ash dropped from the incinerator to the ash extrusion device. The ash treatment system according to claim 2.

4. The upstream conveyance path is a boiler-attached ash conveyance path for conveying fly ash attached to a boiler to the ash extrusion device. The ash treatment system according to claim 2.

5. The ash treatment device includes: an ash extrusion device configured to cool the ash with water and extrude the cooled ash; and a downstream conveyance path for conveying the ash extruded from the ash extrusion device, and the hydrogen sensor is a downstream hydrogen sensor capable of measuring the hydrogen concentration in the downstream conveyance path. The ash treatment system according to claim 1.

6. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

7. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

8. The hydrogen sensor is a wireless hydrogen detection device, and the ash treatment system includes a plurality of the upstream hydrogen sensors, and the plurality of upstream hydrogen sensors continuously measure the hydrogen concentration at a plurality of locations separated from each other in the upstream conveyance path. The ash treatment system according to claim 2.

9. The hydrogen sensor is a wireless hydrogen detection device, and the ash treatment system includes a plurality of the downstream hydrogen sensors, and the plurality of downstream hydrogen sensors continuously measure the hydrogen concentration at a plurality of locations separated from each other in the downstream conveyance path. The ash treatment system according to claim 5.

10. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

11. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

12. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

13. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

14. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

15. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

16. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

17. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

18. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

19. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

20. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

21. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

22. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

23. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

24. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

25. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

26. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

27. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

28. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

29. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

30. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

31. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

32. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

33. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

34. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

35. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

36. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

37. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

38. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

39. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

40. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

41. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the upstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the upstream conveyance path. The ash treatment system according to claim 2.

42. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and when the hydrogen concentration in the downstream conveyance path exceeds a threshold value, the control device performs a ventilation process for ventilating the downstream conveyance path. The ash treatment system according to claim 5.

43. The ash treatment system further includes a control device capable of receiving a signal from the hydrogen sensor, and The ash treatment system according to claim 5, wherein the plurality of downstream hydrogen sensors continuously measure the hydrogen concentrations at a plurality of locations separated from each other in the downstream conveyance path.

10. The ash extrusion device has an inlet for receiving the ash, The ash treatment system, The ash treatment system according to claim 2 or claim 5, further comprising an inlet hydrogen sensor capable of measuring the hydrogen concentration in the inlet of the ash extrusion device.

11. The ash treatment system according to claim 2 or claim 5, wherein the ash extrusion device has a cooling water tank for immersing the ash in water for cooling.

12. The ash treatment system according to claim 2 or claim 5, wherein the ash extrusion device has a water spraying means for spraying water on the ash to cool the ash.

13. The ash treatment device, Comprises a water-cooled conveyor for cooling the ash with water and conveying the cooled ash, The ash treatment system according to claim 1, wherein the hydrogen sensor is capable of measuring the hydrogen concentration in the water-cooled conveyor.

14. A hydrogen concentration detection system for detecting the hydrogen concentration in an ash treatment device for treating ash discharged from an incinerator, A hydrogen sensor capable of measuring the hydrogen concentration, And a control device capable of receiving a signal from the hydrogen sensor A hydrogen concentration detection system comprising:

15. The ash treatment device, An ash extrusion device for cooling the ash with water and extruding the cooled ash, And an upstream conveyance path connected to the ash extrusion device for conveying the ash, The hydrogen concentration detection system according to claim 14, wherein the hydrogen sensor is an upstream hydrogen sensor capable of measuring the hydrogen concentration in the upstream conveyance path.

16. The ash treatment device, An ash extrusion device for cooling the ash with water and extruding the cooled ash, And a downstream conveyance path connected to the ash extrusion device for conveying the ash extruded from the ash extrusion device, The hydrogen concentration detection system according to claim 14, wherein the hydrogen sensor is a downstream hydrogen sensor capable of measuring the hydrogen concentration in the downstream conveyance path.

17. The ash extrusion device has an inlet for receiving the ash, The hydrogen concentration detection system, The hydrogen concentration detection system according to claim 15 or claim 16, further comprising an inlet hydrogen sensor capable of measuring the hydrogen concentration in the inlet of the ash extrusion device.

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