Regenerative combustion equipment

Abstract

To quickly detect an abnormality in an exhaust valve provided in an exhaust gas pipe for discharging combustion exhaust gas from inside a furnace through a heat storage section in a regenerative combustion facility equipped with a pair of regenerative burners that alternately perform combustion operation and heat storage operation. [Solution] In a regenerative combustion facility equipped with a pair of regenerative burners 10a, 10b that alternate between combustion operation and heat storage operation, oxygen concentration sensors 36a, 36b are provided downstream of exhaust valves 34a, 34b provided in exhaust gas pipes 32a, 32b that exhaust combustion exhaust gas Gr from inside the furnace 1 through heat storage sections 20a, 20b, and the oxygen concentration sensors measure the oxygen concentration contained in the gas flowing through the exhaust gas pipes of the regenerative burners during combustion operation to detect any abnormalities in the exhaust valves.

Description

[Technical Field]

[0001] The present invention relates to a regenerative combustion facility equipped with a pair of regenerative burners that alternately perform a combustion operation in which a supply valve provided on an air supply pipe is opened to introduce combustion air into a heat storage unit, the combustion air is heated in the heat storage unit and sprayed into a furnace, and fuel gas is burned in the furnace, and an exhaust operation in which the combustion exhaust gas after the fuel gas has been burned is introduced from the furnace into the heat storage unit, the heat of the combustion exhaust gas is stored in the heat storage unit, and the combustion exhaust gas is exhausted by opening an exhaust valve provided on an exhaust gas pipe. In particular, in the regenerative burner, when a supply valve on the air supply pipe is opened to introduce combustion air into the heat storage section, the combustion air is heated in the heat storage section and ejected into the furnace, and the fuel gas is burned in the furnace, some of the combustion air leaks out through the exhaust valve on the exhaust gas pipe and is exhausted, reducing the amount of combustion air mixed with the fuel gas and burned. As a result, the heat in the heat storage section is not consumed by the combustion air and the temperature of the heat storage section increases, and as a result, the combustion exhaust gas cannot exchange heat with the heat storage body sufficiently, and the combustion exhaust gas passes through the exhaust valve at a high temperature, which can cause early thermal damage to the exhaust valve, or the fuel gas is burned at a low air ratio, generating soot that contaminates the furnace, or generating unburned fuel gas. [Background technology]

[0002] Conventionally, in industrial furnaces and the like that heat-treat various materials to be treated, such as steel, regenerative combustion equipment equipped with a pair of regenerative burners has been widely used that performs the following operations alternately: a combustion operation in which a supply valve provided in an air supply pipe is opened to introduce combustion air into a heat storage unit, the combustion air is heated in the heat storage unit and ejected into the furnace, and the air is mixed with fuel gas and burned in the furnace, so as to make effective use of the heat of the combustion exhaust gas produced when fuel gas is burned inside the furnace; and an exhaust operation in which the combustion exhaust gas produced after the fuel gas has been burned is introduced from inside the furnace into the heat storage unit, the heat of the combustion exhaust gas is stored in the heat storage unit, and the combustion exhaust gas is exhausted by opening an exhaust valve provided in the exhaust gas pipe.

[0003] In the regenerative combustion equipment described above, an exhaust valve provided in the exhaust gas pipe is opened to exhaust the combustion exhaust gas, and an exhaust fan is provided in the exhaust gas pipe to create negative pressure inside the exhaust gas pipe and suck in the combustion exhaust gas.

[0004] Here, in the regenerative burner, when the combustion operation and exhaust operation are performed alternately as described above, the temperature of the combustion exhaust gas after storing heat in the heat storage section is high, and opening the exhaust valve to exhaust the combustion exhaust gas repeatedly can cause the exhaust valve to deteriorate, or for other reasons, the exhaust valve can malfunction, making it impossible to close the exhaust valve completely, or leaving a gap even when the valve plate is closed.

[0005] In this state, when the supply valve provided on the air supply pipe is opened as described above to introduce combustion air into the heat storage section, where it is heated and ejected into the furnace, and the fuel gas is burned in the furnace, a portion of the combustion air introduced into the heat storage section is introduced into the exhaust gas pipe, which is under negative pressure, through gaps in the valve plate of the exhaust valve, and is exhausted.

[0006] If a portion of the combustion air introduced into the heat storage unit from the air supply pipe leaks through the exhaust valve and is exhausted through the exhaust gas pipe, the amount of combustion air introduced into the heat storage unit decreases, the heat in the heat storage unit is not consumed by the combustion air, the temperature of the heat storage unit increases, and as a result, the combustion exhaust gas cannot sufficiently exchange heat with the heat storage unit, and the combustion exhaust gas passes through the exhaust valve at a high temperature, which can cause early thermal damage to the exhaust valve.Furthermore, the fuel gas is burned with a low air ratio, which generates soot that pollutes the furnace interior and generates unburned fuel gas, among other problems.

[0007] Furthermore, as shown in Patent Document 1, a conventional system has been disclosed in which combustion exhaust gas is led from inside a furnace to a heat storage section to store the heat of the combustion exhaust gas in the heat storage section, and when the combustion exhaust gas is discharged by opening an exhaust valve provided in an exhaust gas pipe, outside air is taken in to lower the temperature of the combustion exhaust gas led to the exhaust valve through the exhaust gas pipe, thereby preventing damage to the exhaust valve.

[0008] However, in the device shown in Patent Document 1, as described above, a defect occurs in the exhaust valve, making it impossible to close the exhaust valve completely, and it is not possible to properly detect that part of the combustion air led from the air supply pipe to the heat storage section is led through the exhaust valve to the exhaust gas pipe, which is under negative pressure, and then exhausted.

[0009] Furthermore, Patent Document 2 discloses a method in which a regenerative burner is stopped, the gas temperature between the regenerative section and the exhaust valve is measured while the burner is stopped, and if the gas temperature exceeds a predetermined level, air is introduced from an air supply pipe to cool the burner, thereby preventing damage to the exhaust valve.

[0010] However, although the device shown in Patent Document 2 detects danger by measuring the temperature of the gas, the temperature of the gas changes slowly due to the influence of heat stored in surrounding heated parts and radiation, and the gas remaining in areas where it is difficult to flow, making it difficult to detect abnormalities accurately and quickly. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Patent No. 7311482 [Patent Document 2] Patent No. 4801185 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0012] The present invention aims to solve the above-mentioned problems in a regenerative combustion facility equipped with a regenerative burner that alternately performs a combustion operation in which a supply valve provided on an air supply pipe is opened to introduce combustion air into a heat storage section, the combustion air is heated in the heat storage section and sprayed into a furnace, and fuel gas is burned in the furnace, and an exhaust operation in which the combustion exhaust gas after the fuel gas has been burned is introduced from the furnace into the heat storage section, the heat of the combustion exhaust gas is stored in the heat storage section, and the combustion exhaust gas is exhausted by opening an exhaust valve provided on an exhaust gas pipe.

[0013] That is, in the present invention, in a regenerative burner installed in a regenerative combustion facility as described above, when a supply valve on an air supply pipe is opened to introduce combustion air into a heat storage unit, where it is heated and ejected into a furnace, and fuel gas is burned in the furnace, if the exhaust valve cannot be completely closed during the combustion operation, part of the combustion air introduced into the heat storage unit is introduced through the exhaust valve into an exhaust gas pipe which is under negative pressure and exhausted, reducing the amount of combustion air introduced into the heat storage unit, and the heat in the heat storage unit is not consumed by the combustion air, causing the temperature of the heat storage unit to rise, preventing sufficient heat exchange between the combustion exhaust gas and the heat storage body, and causing the combustion exhaust gas to pass through the exhaust valve at a high temperature, which can lead to early thermal damage to the exhaust valve, or the fuel gas being burned with a low air ratio, which can generate soot and contaminate the inside of the furnace, or the generation of unburned fuel gas, the object of the present invention is to prevent such problems by detecting the symptoms and allowing parts to be replaced or maintenance to be performed before such problems occur. [Means for solving the problem]

[0014] In order to solve the above-mentioned problems, the regenerative combustion equipment of the present invention is equipped with a regenerative burner that alternately performs a combustion operation in which a supply valve provided on an air supply pipe is opened to introduce combustion air into a heat storage unit, the combustion air is heated in the heat storage unit and sprayed into a furnace, and fuel gas is burned in the furnace, and an exhaust operation in which the combustion exhaust gas after the fuel gas has been burned is introduced from the furnace into a heat storage unit, the heat of the combustion exhaust gas is stored in the heat storage unit, and the combustion exhaust gas is exhausted by opening an exhaust valve provided on an exhaust gas pipe.In this regenerative combustion equipment, an oxygen concentration sensor is provided downstream of the exhaust valve provided on the exhaust gas pipe, and the oxygen concentration sensor measures the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner during combustion operation to detect any abnormalities in the exhaust valve.

[0015] In addition, as in the regenerative combustion equipment of the present invention, an oxygen concentration sensor is provided downstream of the exhaust valve provided in the exhaust gas pipe, and the oxygen concentration sensor detects leakage of combustion air based on the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner during combustion operation.This means that the device is not affected by radiation or stagnation, as is the case when measuring temperature, and it becomes possible to quickly detect abnormalities in leakage of combustion air (actually oxygen in the air) from the exhaust valve.

[0016] Furthermore, in the regenerative combustion equipment of the present invention, when measuring the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner during combustion operation using the oxygen concentration sensor as described above, the exhaust valve provided on the exhaust gas pipe is closed, and then the supply valve provided on the air supply pipe that supplies combustion air to the regenerative burner is opened, thereby measuring the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner.

[0017] Normally, the exhaust valve is closed and the supply valve is opened simultaneously. However, when using a butterfly valve like the one shown in the embodiment, it takes several seconds for these operations to be completed. During this time, some of the combustion air led from the air supply pipe to the thermal storage unit passes through the lower space of the thermal storage unit and short-passes into the exhaust gas pipe via the exhaust valve. This causes a large amount of air to temporarily flow into the exhaust gas pipe, leading the oxygen concentration sensor to mistakenly believe there is a leak. This means that accurate measurements cannot be made until some time has passed since the exhaust valve closed. However, by closing the exhaust valve first, short-passing can be prevented, allowing accurate measurements to be made immediately after the exhaust valve closes.

[0018] In addition, in the regenerative combustion equipment of the present invention, a detection operation timing for detecting an abnormality in the exhaust valve can be set, and at this detection operation timing, the oxygen concentration sensor can measure the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner during combustion operation. In order to accurately measure whether a portion of the combustion air led from the air supply pipe to the thermal storage unit leaks through the exhaust valve and is exhausted through the exhaust gas pipe, it is preferable that, during combustion operation, after closing the exhaust valve provided on the exhaust gas pipe as described above, the supply valve provided on the air supply pipe that supplies combustion air to the regenerative burner is opened, and the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner is measured by the oxygen concentration sensor.

[0019] In addition, in the regenerative combustion equipment according to the present invention, a suction pipe can be provided in the exhaust gas pipe downstream of the exhaust valve to suck in the gas flowing through the exhaust gas pipe and guide it to the oxygen concentration sensor. In this way, when combustion air leaks from the exhaust valve and flows through the exhaust gas pipe, the gas flowing through the exhaust gas pipe can be sucked in by the suction pipe and reliably guided to the oxygen concentration sensor, making it possible to measure the oxygen concentration. [Effects of the Invention]

[0020] In the regenerative combustion equipment of the present invention, an oxygen concentration sensor is provided downstream of the exhaust valve provided in the exhaust gas pipe as described above, and the oxygen concentration sensor measures the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner during combustion operation to detect abnormalities in the exhaust valve.Therefore, during combustion operation, the oxygen concentration sensor can detect earlier leakage of some of the combustion air led to the regenerative unit through the exhaust valve provided in the exhaust gas pipe and being exhausted than when a conventional temperature sensor is used.

[0021] As a result, in the regenerative combustion equipment of the present invention, during combustion operation, the amount of combustion air mixed with the fuel gas and burned decreases, the heat in the heat storage section is not consumed by the combustion air, and the temperature of the heat storage section increases. As a result, the combustion exhaust gas cannot exchange heat sufficiently with the heat storage body, and the combustion exhaust gas passes through the exhaust valve at a high temperature, which can cause early thermal damage to the exhaust valve, or the fuel gas is burned at a low air ratio, generating soot and contaminating the inside of the furnace, or generating unburned fuel gas.By being able to quickly detect the symptoms and perform part replacement or maintenance before these problems occur, it is possible to prevent such problems at an early stage. [Brief explanation of the drawings]

[0022] [Figure 1] This is a schematic explanatory diagram showing a regenerative combustion facility according to one embodiment of the present invention, in which in one regenerative burner, a supply valve provided on an air supply pipe is opened to guide combustion air into a heat storage section, the combustion air is heated in the heat storage section and sprayed into a furnace, and the air is mixed with fuel gas in the furnace and burned, performing a combustion operation; in the other regenerative burner, the combustion exhaust gas after the fuel gas has been burned is guided from the furnace to a heat storage section, the heat of the combustion exhaust gas is stored in the heat storage section, and the exhaust valve provided on the exhaust gas pipe is opened to exhaust the combustion exhaust gas. [Figure 2]This is a schematic diagram showing a state in which, in the regenerative combustion equipment of the above embodiment, an oxygen concentration sensor is provided downstream of an exhaust valve provided in an exhaust gas pipe, and the oxygen concentration sensor measures the oxygen concentration contained in the gas that leaks from the exhaust valve and flows through the exhaust gas pipe during combustion operation, thereby detecting an abnormality in the exhaust valve. [Figure 3] 1A and 1B are partial schematic diagrams showing an example of operating an exhaust valve provided in an exhaust gas pipe and a supply valve provided in an air supply pipe when switching from exhaust operation to combustion operation in one of the regenerative burners in the regenerative combustion equipment of the above embodiment. [Figure 4] FIG. 10 is a partial schematic explanatory diagram showing an example in which a bypass pipe is provided in the regenerative combustion equipment according to the embodiment, in order to use a suction blower to draw exhaust gas into the oxygen concentration sensor. BEST MODE FOR CARRYING OUT THE INVENTION

[0023] The regenerative combustion equipment according to the embodiment of the present invention will be specifically described below with reference to the accompanying drawings. Note that the regenerative combustion equipment according to the present invention is not limited to the embodiment shown below, and can be appropriately modified and implemented within the scope of the invention.

[0024] In the regenerative combustion equipment of this embodiment, as shown in Figure 1, a pair of first and second regenerative burners 10a and 10b are arranged facing each other toward the inside of the furnace 1, and each of the pair of regenerative burners 10a, 10b is provided with a fuel injection nozzle 11a, 11b that injects fuel gas G toward the inside of the furnace 1.

[0025] In addition, in the regenerative combustion equipment of this embodiment, combustion air Air is blown by an air blower 21, and is supplied to each of the regenerative burners 10a, 10b through air supply pipes 22a, 22b to each of the regenerative sections 20a, 20b containing the regenerative body x, and each of the air supply pipes 22a, 22b is provided with a supply valve 23a, 23b.

[0026] In the regenerative combustion system of this embodiment, the combustion exhaust gas Gr obtained after the combustion of the fuel gas G is exhausted from the furnace 1 through the intake and exhaust ports 24a, 24b of the regenerative burners 10a, 10b and the regenerative burners 10b through the regenerative burners 20a, 20b. The combustion exhaust gas Gr is drawn into the furnace 1 by the suction blower 31 and guided to the regenerative burners 20a, 20b. The heat of the combustion exhaust gas Gr is stored in the regenerative burners 20a, 20b. The regenerative burners 10a, 10b then exhaust the combustion exhaust gas Gr through the regenerative burners 10a, 10b through the regenerative burners 10a, 10b. The regenerative burners 10a, 10b are each provided with an exhaust valve 34a, 34b. While the regenerative burners 10a, 10b are illustrated as butterfly valves, other valves, such as solenoid valves, may be used.

[0027] In the regenerative combustion system of this embodiment, suction pipes 35a, 35b are provided downstream of the exhaust valves 34a, 34b provided in the exhaust pipes 32a, 32b to suck in a portion of the gas flowing through the exhaust pipes 32a, 32b. The gas sucked in by the suction pipes 35a, 35b is guided to oxygen concentration sensors 36a, 36b to measure the oxygen concentration of the gas flowing through the exhaust pipes 32a, 32b. The oxygen concentration sensors 36a, 36b are paired with suction pumps (not shown) to suck in the gas flowing through the exhaust pipes 32a, 32b. The gas may be sucked in naturally by positive pressure within the exhaust pipes 32a, 32b, or by connecting a bypass pipe 37 and using the suction force of a suction blower 31, as shown in FIG. 4.

[0028] The oxygen concentrations measured by the oxygen concentration sensors 36a, 36b are output to an abnormality detection device 40, which detects abnormalities in the exhaust valves 34a, 34b based on the measured oxygen concentrations.

[0029] 1, in the regenerative combustion equipment of this embodiment, in the regenerative burner 10a performing combustion operation, the supply valve 23a provided on the air supply pipe 22a is opened, combustion air Air is introduced through the air supply pipe 22a to the heat storage section 20a containing the heat storage body x, the combustion air Air is heated by the heat stored in the heat storage body x contained in the heat storage section 20a, and the heated combustion air Air is injected into the furnace 1 through the intake and exhaust port 24a of the regenerative burner 10a, and fuel gas G is injected into the furnace 1 from the fuel injection nozzle 11a, so that the fuel gas G is mixed with the combustion air Air and combusted in the furnace 1. In this case, in the regenerative burner 10a, the exhaust valve 34a provided on the exhaust gas pipe 32a is closed to prevent the combustion exhaust gas Gr from being introduced from the furnace 1 to the heat storage section 20a through the intake and exhaust port 24a.

[0030] On the other hand, in the regenerative burner 10b that performs the exhaust operation, as shown in FIG. 1, the supply valve 23b provided on the air supply pipe 22b is closed to prevent the introduction of combustion air Air to the heat storage section 20b and to prevent the supply of fuel gas G to the fuel injection nozzle 11b, while the exhaust valve 34b provided on the exhaust gas pipe 32b is opened, and the combustion exhaust gas Gr obtained after the fuel gas G is burned in the furnace 1 is introduced into the heat storage section 20b through the intake and exhaust port 24b by the suction blower 31, and the heat of the combustion exhaust gas Gr is stored in the heat storage body x contained in this heat storage section 20b, and then the combustion exhaust gas Gr is exhausted through the exhaust gas pipe 32b with the exhaust valve 34b opened.

[0031] Here, when the pair of regenerative burners 10a and 10b are configured to alternately perform the combustion operation and exhaust operation, the temperature of the combustion exhaust gas Gr after storing heat in each of the heat storage sections 20a, 20b is high, and by repeatedly opening each of the exhaust valves 34a, 34b and exhausting the combustion exhaust gas Gr through each of the exhaust gas pipes 32a, 32b as described above, each of the exhaust valves 34a, 34b may deteriorate, and for other reasons, each of the exhaust valves 34a, 34b may malfunction, making it impossible to completely close each of the exhaust valves 34a, 34b.

[0032] In this way, if it becomes impossible to completely close each exhaust valve 34a, 34b, for example, in a regenerative burner 10a performing combustion operation, as shown in Figure 2, if the supply valve 23a is opened and combustion air Air is guided to the heat storage section 20a through the air supply pipe 22a, part of the combustion air Air guided to the heat storage section 20a will be sucked in by the suction blower 31 and guided through the exhaust valve 34a, which is not completely closed, to the exhaust gas pipe 32a and exhausted.

[0033] When a portion of the combustion air Air led to the heat storage section 20a in this manner is led through the exhaust valve 34a, which is not completely closed, to the exhaust gas pipe 32a and exhausted, the amount of combustion air Air led to the heat storage section 20a decreases, the heat in the heat storage section 20a is not consumed by the combustion air Air, and the temperature of the heat storage section 20a increases. As a result, the combustion exhaust gas Gr cannot sufficiently exchange heat with the heat storage body x, and the combustion exhaust gas Gr passes through the exhaust valve 34a at a high temperature, which can cause early thermal damage to the exhaust valve 34a, or the fuel gas G can be burned at a low air ratio, generating soot and contaminating the inside of the furnace 1, or generating unburned fuel gas G.

[0034] For this reason, in the regenerative combustion equipment of this embodiment, in the regenerative burner 10a performing combustion operation, the gas flowing through the exhaust gas pipe 32a is guided to the oxygen concentration sensor 36a through the suction pipe 35a provided in the exhaust gas pipe 32a downstream of the exhaust valve 34a as described above, and the oxygen concentration contained in the gas flowing through the exhaust gas pipe 32a is measured by the oxygen concentration sensor 36a and the measurement result is output to the abnormality detection device 40. If the measured oxygen concentration rises to or exceeds a predetermined value even during combustion operation, the abnormality detection device 40 detects an abnormality in the exhaust valve 34a and issues an instruction to replace the exhaust valve 34a, etc.

[0035] As a result, in the regenerative combustion equipment of this embodiment, an abnormality in the exhaust valve 34a can be quickly detected and a portion of the combustion air Air led to the thermal storage section 20a can be quickly prevented from being led through the exhaust valve 34a to the exhaust gas pipe 32a and exhausted. This makes it possible to quickly and reliably prevent problems such as the temperature of the thermal storage section 20a becoming too high, which would prevent the combustion exhaust gas Gr from sufficiently exchanging heat with the thermal storage body x, causing the combustion exhaust gas Gr to pass through the exhaust valve 34a at a high temperature, resulting in early thermal damage to the exhaust valve 34a, or the fuel gas G being burned at a low air ratio, generating soot and contaminating the inside of the furnace 1, or the generation of unburned fuel gas G. By being able to quickly and reliably detect the symptoms and perform part replacement or maintenance, such problems can be prevented early and reliably.

[0036] Furthermore, in the regenerative combustion equipment of this embodiment, as shown in Figure 3(A), in one of the regenerative burners 10a, the supply valve 23a provided on the air supply pipe 22a is closed to prevent the combustion air (Air) from being introduced to the heat storage section 20a, while the exhaust valve 34a provided on the exhaust gas pipe 32a is opened to introduce the combustion exhaust gas (Gr) into the heat storage section 20a, storing the heat of the combustion exhaust gas (Gr) in the heat storage section 20a, and then, when switching from the exhaust operation in which the combustion exhaust gas (Gr) is exhausted from the exhaust valve 34a through the exhaust gas pipe 32a to the combustion operation shown in Figure 2, it is preferable to operate the exhaust valve 34a to close while keeping the supply valve 23a provided on the air supply pipe 22a closed, and then open the supply valve 23a provided on the air supply pipe 22a to introduce the combustion air (Air) to the heat storage section 20a, as shown in Figure 2.

[0037] Normally, the exhaust valve 34a is closed and the supply valve 23a is opened simultaneously. However, when using a butterfly valve such as the one shown in the figure, it takes several seconds for these operations to complete. During this time, some of the combustion air (Air) guided from the air supply pipe 22a to the thermal storage unit 20a short-passes from the lower space of the thermal storage unit 20a through the exhaust valve 34a and into the exhaust gas pipe 32a. This causes a large amount of combustion air to temporarily flow into the exhaust gas pipe 32a, leading the oxygen concentration sensor 36a to mistakenly believe that a leak has occurred. This may mean that accurate measurements cannot be made until some time has passed since the exhaust valve 34a closed. However, by closing the exhaust valve 34a first, short-passing can be prevented, allowing accurate measurements to be made immediately after the exhaust valve 34a closes.

[0038] This operation does not need to be performed every time the air supply and exhaust are switched, but a detection operation timing for detecting an abnormality in the exhaust valve 34a can be set (for example, by setting it to "detection operation mode"), and the oxygen concentration sensor 36a can measure the oxygen concentration contained in the gas flowing through the exhaust gas pipe 32a of the regenerative burner 10a during combustion operation at the detection operation timing. This can be performed at any timing or periodically.

[0039] Furthermore, since the above operation temporarily closes both the exhaust valve 34a and the supply valve 23a, which may affect the pressure inside the furnace 1, it is best to perform this operation at a time when it will not affect operation, such as when there is no object to be heated (not shown) inside the furnace 1. [Explanation of symbols]

[0040] 1: Furnace 10a, 10b: Regenerative burner 11a, 11b: fuel injection nozzle 20a, 20b: Heat storage part 21: Air blower 22a, 22b: Air supply pipe 23a, 23b: Supply valve 24a, 24b: Supply / exhaust port 31: Suction blower 32a, 32b: Exhaust gas pipe 34a, 34b: Exhaust valve 35a, 35b: Suction tube 36a, 36b: Oxygen concentration sensor 37: Bypass pipe 40: Anomaly detection device Air: Combustion air G: Fuel gas Gr: Combustion exhaust gas x : Heat storage body

Claims

1. In this regenerative combustion equipment, which is equipped with a pair of regenerative burners, the equipment alternates between a combustion operation in which a supply valve provided on an air supply pipe is opened to introduce combustion air into a heat storage unit, where the combustion air is heated and ejected into a furnace, thereby burning fuel gas in the furnace, and an exhaust operation in which the combustion exhaust gas after the fuel gas has been burned is introduced from the furnace into a heat storage unit, where the heat of the combustion exhaust gas is stored in the heat storage unit, and the combustion exhaust gas is exhausted by opening an exhaust valve provided on the exhaust gas pipe.The regenerative combustion equipment is characterized in that an oxygen concentration sensor is provided downstream of the exhaust valve provided on the exhaust gas pipe, and the oxygen concentration sensor measures the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner during combustion operation to detect an abnormality in the exhaust valve.

2. In the regenerative combustion equipment described in claim 1, when the oxygen concentration sensor measures the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative burner during combustion operation, after closing the exhaust valve provided on the exhaust gas pipe, the supply valve provided on the air supply pipe that supplies combustion air to the regenerative burner is opened, and the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative combustion equipment is measured.

3. In the regenerative combustion equipment described in claim 1 or claim 2, a detection operation timing is set to perform an operation to detect an abnormality in the exhaust valve, and at the detection operation timing, the oxygen concentration sensor measures the oxygen concentration contained in the gas flowing through the exhaust gas pipe of the regenerative combustion burner during combustion operation.

4. 3. The regenerative combustion equipment according to claim 1, wherein a suction pipe is provided in the exhaust gas pipe downstream of the exhaust valve to suck in the gas flowing through the exhaust gas pipe and lead it to the oxygen concentration sensor.

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