Heat accumulating type hydrogen combustion equipment

Abstract

Air supply and exhaust ports (20a, 20b) are provided on both sides of a fuel injection nozzle (10) that injects hydrogen gas (H2) into a furnace (R1), and a combustion operation in which air (Air) heated in heat storage sections (33a, 33b) that house heat storage bodies (34a, 34b) is injected into the furnace from one of the air supply and exhaust ports, and a heat storage operation in which air (Air) heated in the heat storage sections (33a, 33b) is injected from the other of the air supply and exhaust ports into the furnace (R1) is performed alternately. And a heat storage operation in which combustion exhaust gas obtained by combusting the fuel in the furnace is guided to the heat storage unit through the other supply / exhaust port, and heat of the combustion exhaust gas is stored in the heat storage body housed in the heat storage unit.

Description

Technical Field

[0001] The present invention relates to a regenerative hydrogen combustion device using hydrogen as fuel, which performs a combustion action and a regenerative action. In the combustion action, the fuel is sprayed into a furnace from a fuel spray nozzle, and air heated by passing through a regenerative section containing a regenerative body is sprayed into the furnace from an air supply and exhaust port, and the fuel and air are mixed and burned in the furnace. In the regenerative action, the combustion exhaust gas after the fuel is burned in the furnace is guided from the air supply and exhaust port to the regenerative section, and the heat of the combustion exhaust gas is stored in the regenerative body contained in the regenerative section. Background Art

[0002] Conventionally, in industrial furnaces for heat treatment of various processed materials such as steel, in order to effectively utilize the heat of combustion exhaust gas formed by burning fuel in the furnace, a heat storage type combustion device that performs combustion action and heat storage action is known. In the combustion action, fuel is sprayed into the furnace from a fuel spray nozzle, and air heated by passing through a heat storage section that accommodates a heat storage body is sprayed into the furnace from an air supply and exhaust port, and the fuel and air are mixed and burned in the furnace. In the heat storage action, the combustion exhaust gas after the fuel is burned in the furnace is guided from the air supply and exhaust port to the heat storage section, and the heat of the combustion exhaust gas is stored in the heat storage body accommodated in the heat storage section.

[0003] Moreover, as the heat storage combustion equipment, as shown in Patent Document 1, there is known a device in which air supply and exhaust ports are provided on both sides of a fuel injection nozzle and combustion action and heat storage action are alternately performed. In the combustion action, air heated in a heat storage section accommodating a heat storage body is injected into a furnace from the air supply and exhaust ports on one side, and the fuel injected into the furnace from the fuel injection nozzle is burned. In the heat storage action, the combustion exhaust gas after the fuel is burned in the furnace is guided to the heat storage section through the air supply and exhaust ports on the other side, and the heat of the combustion exhaust gas is stored in the heat storage body accommodated in the heat storage section.

[0004] In addition, as shown in Patent Document 2, a structure is known in which a pair of regenerative burners are arranged, wherein the regenerative burners have a fuel injection nozzle and an air supply and exhaust port, wherein the fuel injection nozzle sprays fuel into the furnace, and the air supply and exhaust port sprays air heated in a heat storage section containing a regenerative body into the furnace and guides combustion exhaust gas after the fuel is burned in the furnace to the regenerative section so that the heat of the combustion exhaust gas is stored in the regenerative body contained in the regenerative section, wherein a combustion action is performed in one of the regenerative burners, and in the combustion action, the heat from the combustion exhaust gas is heated to a certain temperature. The fuel injection nozzle injects fuel into the furnace, and the air heated by passing through the heat storage section which accommodates the heat storage body is injected into the furnace from the air supply and exhaust port, and the fuel and air are mixed and burned in the furnace. In the other heat storage burner, a heat storage action is performed. In the heat storage action, the injection of fuel into the furnace from the fuel injection nozzle is stopped, and the combustion exhaust gas after the fuel is burned in the furnace is guided to the heat storage section so that the heat of the combustion exhaust gas is stored in the heat storage body accommodated in the heat storage section. In the paired heat storage burners, the combustion action and the heat storage action are switched alternately.

[0005] Here, in each of the above-mentioned regenerative combustion burners of the conventional regenerative combustion equipment, fossil fuels such as hydrocarbon gas are generally used as fuel.

[0006] Here, as shown in the aforementioned patent document 1, the combustion action and the heat storage action are switched alternately. In the combustion action, a fossil fuel such as hydrocarbon gas is ejected from a fuel injection nozzle, and air heated in a heat storage section containing a heat storage body is ejected from an air supply and exhaust port on one side into the furnace, and the fuel injected into the furnace from the fuel injection nozzle is burned. In the heat storage action, the combustion exhaust gas after the fuel is burned in the furnace is guided to the heat storage section through an air supply and exhaust port on the other side, and the heat of the combustion exhaust gas is stored in the heat storage body contained in the heat storage section. In this case, there is the following problem: the air is temporarily insufficient during the switching, and the fossil fuel ejected from the fuel injection nozzle into the furnace is not completely burned, thereby generating smoke and dust, so that the treated object is contaminated.

[0007] In addition, as shown in the aforementioned patent document 2, in one side of the heat storage burner, a combustion action is performed, in which fossil fuel is sprayed into the furnace from the fuel injection nozzle, and air heated by passing through a heat storage section containing a heat storage body is sprayed into the furnace from the air supply and exhaust port, and the fossil fuel and air are mixed and burned in the furnace. On the other hand, in the other side of the heat storage burner, a heat storage action is performed, in which the fuel is stopped from being sprayed into the furnace from the fuel injection nozzle, and the combustion exhaust gas after the fossil fuel is burned in the furnace is guided to the heat storage section, and the heat of the combustion exhaust gas is accumulated in the heat storage body contained in the heat storage section. The combustion action and the heat storage action are switched alternately in the paired heat storage burners. Even in this case, there is the following problem: the air is temporarily insufficient, and when switching between the combustion action and the heat storage action, the fossil fuel sprayed into the furnace from the fuel injection nozzle is not completely burned and generates smoke, so that the treated object is contaminated.

[0008] Furthermore, in the structure shown in the aforementioned patent document 2, Figure 1 As shown, combustion action is alternately performed in the regenerative burner 1A on one side and regenerative action is performed in the regenerative burner 1B on the other side. In the combustion action, fossil fuel G such as hydrocarbon gas is ejected into the furnace R from the fuel ejection nozzle 2a, and air Air heated by passing through the regenerative section 4a containing the regenerative body 3a is ejected into the furnace R from the supply and exhaust port 5a, and the fossil fuel G and air Air are mixed and burned in the furnace R. In the regenerative action, ejection of the fossil fuel G into the furnace R from the fuel ejection nozzle 2b is stopped, and the combustion exhaust gas after the fossil fuel G is burned in the furnace R is guided from the supply and exhaust port 5b to the regenerative section 4b, so that the heat of the combustion exhaust gas is accumulated in the regenerative body 3b contained in the regenerative section 4b. At this time, as shown in FIG. Figure 2 As shown, in both the heat storage burners 1A and 1B, at the time of starting the combustion action, the air Air that has been heated by passing through the heat storage sections 4a and 4b containing the heat storage bodies 3a and 3b is first ejected from the air supply and exhaust ports 5a and 5b into the furnace R, and then the fossil fuel G is ejected from the fuel ejection nozzles 2a and 2b into the furnace R to start combustion. On the other hand, at the time of starting the heat storage action, the ejection of the fossil fuel G from the fuel ejection nozzles 2a and 2b into the furnace R is first stopped, and then the action of ejecting the air Air that has been heated by passing through the heat storage sections 4a and 4b containing the heat storage bodies 3a and 3b from the air supply and exhaust ports 5a and 5b into the furnace R is stopped. When the fossil fuel G is ejected from the fuel ejection nozzles 2a and 2b into the furnace R, the generation of smoke is suppressed during combustion in such a way that the air Air that has been heated by passing through the heat storage sections 4a and 4b containing the heat storage bodies 3a and 3b and ejected from the air supply and exhaust ports 5a and 5b into the furnace R will never be insufficient.

[0009] However, in this case, there is a time when no combustion is performed in both the regenerative burners 1A and 1B. Figure 2 As shown, at this point in time, there is a problem that the temperature in the furnace R drops and fluctuates, and the object to be processed cannot be heated at an appropriate temperature. [Prior art literature] [Patent Literature]

[0010] [Patent Document 1]: Japanese Patent No. 4602858 [Patent Document 2]: Japanese Patent No. 3159606 Summary of the invention

[0011] The object of the present invention is to solve the above-mentioned problems in a heat storage type combustion device, wherein the heat storage type combustion device performs a combustion action and a heat storage action. In the combustion action, fuel is sprayed into a furnace from a fuel spray nozzle, and air heated by passing through a heat storage section accommodating a heat storage body is sprayed into the furnace from an air supply and exhaust port, and the fuel and air are mixed and burned in the furnace. In the heat storage action, combustion exhaust gas after the fuel is burned in the furnace is guided from the air supply and exhaust port to the heat storage section, and the heat of the combustion exhaust gas is stored in the heat storage body accommodated in the heat storage section.

[0012] In the first heat storage type hydrogen combustion equipment of the present invention, in order to solve the above-mentioned technical problem, air supply and exhaust ports are provided on both sides of the fuel injection nozzle for spraying hydrogen into the furnace, and combustion action and heat storage action are performed alternately. In the combustion action, air heated in a heat storage section accommodating a heat storage body is sprayed into the furnace from the air supply and exhaust ports on one side, and the hydrogen sprayed into the furnace from the fuel injection nozzle is burned. In the heat storage action, the combustion exhaust gas after the hydrogen is burned in the furnace is guided to the heat storage section through the air supply and exhaust ports on the other side, and the heat of the combustion exhaust gas is stored in the heat storage body accommodated in the heat storage section.

[0013] Here, in the first heat storage type hydrogen combustion equipment, hydrogen is used as the fuel sprayed from the fuel injection nozzle into the furnace. Therefore, even if the hydrogen sprayed from the fuel injection nozzle into the furnace is not completely burned, it will not produce smoke like the existing fossil fuels, thereby preventing the treated object from being contaminated. Moreover, since the combustibility of hydrogen is very high, even if unburned hydrogen is produced, it will be quickly burned.

[0014] Moreover, in the first heat storage type hydrogen combustion equipment, when the action of injecting the air heated in the heat storage part accommodating the heat storage body into the furnace from the air supply and exhaust port on one side and the action of guiding it to the heat storage part through the air supply and exhaust port on the other side are switched at the same time, even if the hydrogen injected into the furnace from the fuel injection nozzle is not completely burned and remains during the switching, smoke will not be generated as mentioned above, thereby preventing the treated object from being contaminated. Moreover, since the combustibility of hydrogen is very high, even if unburned hydrogen is generated, it will be burned quickly.

[0015] In addition, in the second regenerative hydrogen combustion equipment of the present invention, in order to solve the above-mentioned technical problem, a regenerative burner is arranged in pairs, and the regenerative burner has a fuel injection nozzle and an air supply and exhaust port, the fuel injection nozzle sprays hydrogen into the furnace, and the air supply and exhaust port performs the action of spraying air heated in a heat storage part containing a heat storage body into the furnace and the action of guiding the combustion exhaust gas after the hydrogen is burned in the furnace to the heat storage part so that the heat of the combustion exhaust gas is stored in the heat storage body contained in the heat storage part, wherein, in one of the regenerative burners, a combustion action is performed, and in the During the combustion operation, hydrogen is ejected from the fuel ejection nozzle into the furnace, and air heated by passing through a heat storage section containing a heat storage body is ejected from the air supply and exhaust port into the furnace, and the hydrogen and air are mixed and burned in the furnace. In the other heat storage burner, a heat storage operation is performed. During the heat storage operation, the ejection of hydrogen into the furnace from the fuel ejection nozzle is stopped, and the combustion exhaust gas after the hydrogen is burned in the furnace is guided to the heat storage section, and the heat of the combustion exhaust gas is stored in the heat storage body contained in the heat storage section. In the paired heat storage burners, the combustion operation and the heat storage operation are performed alternately.

[0016] Here, in the second thermal storage type hydrogen combustion equipment, similarly to the first thermal storage type hydrogen combustion equipment, hydrogen is used as the fuel sprayed from the fuel injection nozzle into the furnace. Therefore, even if the hydrogen sprayed from the fuel injection nozzle into the furnace is not completely burned, smoke will not be generated like the existing fossil fuels, thereby preventing the treated object from being contaminated. Furthermore, since the combustibility of hydrogen is very high, even if unburned hydrogen is generated, it will be quickly burned.

[0017] Moreover, in the second heat storage type hydrogen combustion equipment, when switching between the combustion action and the heat storage action in the paired heat storage burners, when simultaneously switching between the action of injecting the air heated in the heat storage part accommodating the heat storage body into the furnace from the air supply and exhaust port on one side and the action of guiding it to the heat storage part through the air supply and exhaust port on the other side, even if the hydrogen injected into the furnace from the fuel injection nozzle in the combustion state is not completely burned and remains during the switching, smoke will not be generated as described above, thereby preventing the treated object from being contaminated. Moreover, since the combustibility of hydrogen is very high, even if unburned hydrogen is generated, it will be quickly burned by the combustion action in the other heat storage burner.

[0018] In addition, it is preferred that in the second regenerative hydrogen combustion equipment, a fuel switching valve for switching the supply and stop of hydrogen to the fuel injection nozzle is provided, and an inert gas supply pipe for supplying inert gas to the fuel injection nozzle is provided, and the inert gas is supplied from the inert gas supply pipe to the fuel injection nozzle whose supply of hydrogen has been stopped by the fuel switching valve. In this way, the inert gas is supplied to the fuel injection nozzle whose combustion action has been stopped, thereby preventing the air in the furnace from flowing into the fuel injection nozzle, and then hydrogen is supplied to the fuel injection nozzle and the combustion action is performed. In this case, it is possible to prevent the hydrogen from mixing with the air in the fuel injection nozzle and causing an explosion in the fuel injection nozzle.

[0019] In addition, it is preferred that, in the second regenerative hydrogen combustion device, a fuel switching valve for switching the supply and stop of hydrogen to the fuel injection nozzle is disposed near the nozzle of the fuel injection nozzle. In this way, if the fuel switching valve is disposed near the nozzle of the fuel injection nozzle, when the fuel switching valve is closed, the space between the fuel injection valve for stopping the combustion action and the fuel switching valve becomes smaller, so that the amount of air in the furnace flowing into the fuel injection nozzle can be made very small, and when hydrogen is supplied to the fuel injection nozzle and the combustion action is performed, the hydrogen can be prevented from mixing with the air in the fuel injection nozzle and causing an explosion in the fuel injection nozzle.

[0020] In the first heat storage type hydrogen combustion device and the second heat storage type hydrogen combustion device of the present invention, hydrogen is used as the fuel sprayed from the fuel injection nozzle into the furnace as described above. Even if the hydrogen sprayed from the fuel injection nozzle into the furnace is not completely burned, smoke will not be generated, thereby preventing the treated object from being contaminated. Moreover, since the combustibility of hydrogen is very high, even if unburned hydrogen is generated, it will be quickly burned.

[0021] This can eliminate the temperature fluctuation in the furnace when switching between the combustion operation and the heat storage operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic cross-sectional explanatory diagram showing a conventional thermal storage combustion device. Figure 2 It is a diagram showing the relationship between the timing of spraying fossil fuel from the fuel injection nozzle into the furnace and the timing of spraying air from the air supply and exhaust port into the furnace, the relationship between the timing of stopping spraying fossil fuel from the fuel injection nozzle into the furnace and the timing of stopping spraying air from the air supply and exhaust port into the furnace, and the change in the temperature in the furnace in a pair of heat storage burners 1A and 1B of an existing heat storage combustion equipment. Figure 3 This is a schematic cross-sectional explanatory diagram showing the thermal storage type hydrogen combustion equipment according to the first embodiment of the present invention. Figure 4 This is a schematic cross-sectional explanatory diagram showing a thermal storage type hydrogen combustion device according to a second embodiment of the present invention. Figure 5 It is a diagram showing the relationship between the timing of spraying hydrogen from the fuel injection nozzle into the furnace and the timing of spraying air from the air supply and exhaust port into the furnace, the relationship between the timing of stopping spraying hydrogen from the fuel injection nozzle into the furnace and the timing of stopping spraying air from the air supply and exhaust port into the furnace, and the change in the temperature in the furnace, in the paired regenerative burners 40A and 40B of the regenerative hydrogen combustion equipment of embodiment 2. Figure 6 This is a schematic cross-sectional illustration showing a modification of the thermal storage type hydrogen combustion device of the second embodiment, and showing a state in which a fuel switching valve for switching the supply and stop of hydrogen to the fuel injection nozzle is provided near the injection port of the fuel injection nozzle. (Explanation of symbols) 10 fuel injection nozzle; 11 fuel supply pipe; 12 Fuel switching valve; 13. Spout; 20a, 20b supply and exhaust ports; 21 air supply blower; 22 suction blower; 31: air supply pipe; 32a, 32b supply valve; 33a, 33b heat storage part; 34a, 34b heat storage body; 35 exhaust pipe; 36 Exhaust tower; 36a, 36b exhaust valve; 40A, 40B regenerative burners; 41a, 41b supply and exhaust ports; 42a, 42b heat storage part; 43a, 43b heat storage body; 50a, 50b fuel injection nozzle; 51a, 51b fuel supply pipe; 52a, 52b fuel switching valve; 53a, 53b: ejection port; 54a, 54b inert gas supply pipe; 55a, 55b opening and closing valves; 61 air supply blower; 62 air supply pipe; 63a, 63b supply valve; 64 Suction blower; 65 exhaust pipe; 66a, 66b exhaust valve; 67 Exhaust Tower; Air H2 Hydrogen; N2 Nitrogen (inert gas); R1 furnace; R2 furnace. DETAILED DESCRIPTION

[0023] Hereinafter, the thermal storage type hydrogen combustion device according to the embodiment of the present invention will be described in detail based on the drawings. In addition, the thermal storage type hydrogen combustion device of the present invention is not limited to the device shown in the following embodiment, and can be implemented with appropriate changes within the scope of the invention.

[0024] (Implementation Method 1) In the regenerative combustion device of embodiment 1, if Figure 3 As shown, the fuel switching valve 12 provided on the fuel supply pipe 11 for supplying hydrogen H2 is opened, and the hydrogen H2 is guided to the fuel injection nozzle 10 through the fuel supply pipe 11, and the hydrogen H2 is ejected into the furnace R1 from the ejection port 13 at the front end of the fuel injection nozzle 10. Here, regarding the aforementioned fuel switching valve 12 and various valves described later, the open state is indicated by blank, and the closed state is indicated by black.

[0025] Furthermore, two air supply and exhaust ports 20a and 20b are provided so as to be located on both sides of the ejection port 13 provided at the front end of the fuel injection nozzle 10 of the furnace R1.

[0026] Moreover, on one side of the air supply and exhaust port 20a, as shown in FIG. Figure 3As shown in the figure, the following combustion action is performed: air Air is supplied to the air supply pipe 31 by the air blower 21, and the supply valve 32a provided on one side of the air supply pipe 31 is opened, and the air Air is guided to the heat storage part 33a on one side, and the air Air is heated by the heat storage body 34a heated in the heat storage part 33a, and the heated air Air is injected into the furnace R1 from the supply and exhaust port 20a on one side, and the hydrogen H2 injected into the furnace R1 from the fuel injection nozzle 10 is burned. In addition, in the combustion action of supplying air Air to the heat storage part 33a in the above manner and burning the hydrogen H2, the exhaust valve 36a provided on one side of the exhaust pipe 35 for discharging the combustion exhaust gas from the heat storage part 33a is closed.

[0027] On the other hand, on the other side of the air supply and exhaust port 20b, as shown in FIG. Figure 3 As shown, the following heat storage action is performed: the supply valve 32b on the other side provided on the air supply pipe 31 is closed so that the air Air is not guided to the heat storage section 33b on the other side. On the other hand, the exhaust valve 36b provided on the exhaust pipe 35 for discharging the combustion exhaust gas from the heat storage section 33b is opened, and the combustion exhaust gas after burning the hydrogen H2 is sucked by the suction blower 22, and is guided from the furnace R1 through the supply and exhaust port 20b to the heat storage section 33b on the other side, and the heat of the combustion exhaust gas is stored in the heat storage body 34b in the heat storage section 33b; thereafter, the combustion exhaust gas is guided to the exhaust tower 36 through the exhaust pipe 35 and discharged.

[0028] Moreover, in the regenerative combustion equipment of this embodiment 1, as described above, while hydrogen H2 is ejected from the fuel injection nozzle 10 into the furnace R1, the combustion action on the one side of the supply and exhaust port 20a and the regenerative action on the other side of the supply and exhaust port 20b are simultaneously switched alternately.

[0029] Here, in the heat storage combustion equipment of the present embodiment 1, since the hydrogen H2 is sprayed from the fuel injection nozzle 10 into the furnace R1 and burned as described above, even if the air is temporarily insufficient when switching the combustion action on the side of the supply and exhaust port 20a on one side and the heat storage action on the side of the supply and exhaust port 20b on the other side, the hydrogen H2 is not completely burned, and a part of the hydrogen H2 still remains, smoke will not be generated like the existing fossil fuels, and the treated object (not shown) will not be contaminated. In addition, since the combustibility of hydrogen H2 is very high, even if unburned hydrogen H2 is generated, it will be quickly burned by the air Air injected into the furnace R1 from the supply and exhaust ports 20a, 20b after the switching.

[0030] (Implementation Method 2) In the regenerative combustion device of embodiment 2, if Figure 4As shown, a pair of regenerative burners 40A and 40B are disposed so as to face each other toward the inside of the furnace R2.

[0031] Furthermore, in each of the paired regenerative burners 40A and 40B, each fuel switching valve 52a and 52b provided on each fuel supply pipe 51a and 51b for supplying hydrogen H2 is opened, and the hydrogen H2 is guided to each fuel injection nozzle 50a and 50b through each fuel supply pipe 51a and 51b, and the hydrogen H2 is sprayed into the furnace R2 from the spray ports 53a and 53b at the front end of each fuel injection nozzle 50a and 50b. In addition, regarding the aforementioned fuel switching valves 52a and 52b and various valves described later, similarly to the first embodiment, the open state is indicated by blank, and the closed state is indicated by black.

[0032] In addition, for the fuel injection nozzles 50a, 50b, inert gas supply pipes 54a, 54b for supplying inert gas nitrogen N2 are respectively provided, and opening and closing valves 55a, 55b are respectively provided on each inert gas supply pipe 54a, 54b, and the supply and stop of nitrogen N2 relative to each fuel injection nozzle 50a, 50b are carried out by opening and closing the opening and closing valves 55a, 55b.

[0033] Moreover, in the heat storage combustion equipment of embodiment 2, air Air is supplied to the air supply pipe 62 by the air supply blower 61, and supply valves 63a, 63b are respectively arranged in the air supply pipe 62 corresponding to each heat storage part 42a, 42b in each heat storage burner 40A, 40B, so that the supply valves 63a, 63b are opened and closed, and the supply and stop of air Air relative to each heat storage part 42a, 42b are switched, and the air Air is sprayed into the furnace R2 from each supply and exhaust port 41a, 41b in each heat storage burner 40A, 40B through each heat storage part 42a, 42b.

[0034] In addition, the combustion exhaust gas after the combustion of hydrogen H2 in the furnace R2 is sucked by the suction blower 64 and guided to the heat storage parts 42a and 42b through the exhaust ports 41a and 41b in the heat storage burners 40A and 40B, and the combustion exhaust gas guided to the heat storage parts 42a and 42b is guided to the exhaust pipe 65, and the exhaust valves 66a and 66b provided on the exhaust pipe 65 are opened, and the combustion exhaust gas is guided from the heat storage parts 42a and 42b through the exhaust pipe 65 to the exhaust tower 67 and discharged.

[0035] Moreover, the following combustion action is performed in the heat storage burner 40A on one side: air Air is supplied to the air supply pipe 62 by the air supply blower 61, and the supply valve 63a on one side provided on the air supply pipe 62 is opened, and the air Air is guided to the heat storage section 42a in the heat storage burner 40A, and the air Air is heated by the heated heat storage body 43a in the heat storage section 42a, and the heated air Air is injected into the furnace R2 from the air supply and exhaust port 41a in the heat storage burner 40A, and the fuel switching valve 52a provided on the fuel supply pipe 51a is opened, hydrogen H2 is supplied to the fuel injection valve 50a, and the hydrogen H2 is injected into the furnace R1 from the injection port 53a at the front end of the fuel injection nozzle 50a, and the hydrogen H2 is burned.

[0036] Here, in the heat storage burner 40A on one side that performs the combustion action of injecting the air Air heated by passing through the heat storage section 42a in the above-mentioned manner from the supply and exhaust port 41a into the furnace R2 and burning the hydrogen H2, with respect to the combustion exhaust gas after the hydrogen H2 is burned in the furnace R2, the exhaust valve 66a on one side provided on the exhaust pipe 65 that discharges the combustion exhaust gas from the heat storage section 42a is closed, and the on-off valve 55a provided on the inert gas supply pipe 54a is closed so as not to supply the inert gas nitrogen N2 into the fuel injection nozzle 50a.

[0037] On the other hand, in the other side of the regenerative burner 40B where no combustion action is performed, the following regenerative action is performed: the fuel switching valve 52b provided on the fuel supply pipe 51b is closed so as not to supply hydrogen H2 to the fuel injection nozzle 50b, and the supply valve 63b provided on the air supply pipe 62 is closed so as not to guide the air Air to the regenerative section 42b in the regenerative burner 40B. In this state, the exhaust valve 66b provided on the exhaust pipe 65 for discharging the combustion exhaust gas from the regenerative section 42b is opened, and the combustion exhaust gas after the combustion of the hydrogen H2 in the furnace R2 is sucked by the suction blower 64, and is guided to the regenerative section 42b through the supply and exhaust port 41b in the regenerative burner 40B, so that the heat of the combustion exhaust gas is stored in the regenerative body 43b accommodated in the regenerative section 42b; thereafter, the combustion exhaust gas is guided to the exhaust tower 67 through the exhaust pipe 65 and discharged.

[0038] Here, in the regenerative burner 40B on the other side of the heat storage action in which the hydrogen H2 is not supplied to the fuel injection nozzle 50b and the combustion exhaust gas in the furnace R2 is guided to the heat storage section 42b so that the heat of the combustion exhaust gas is stored in the heat storage body 43b accommodated in the heat storage section 42b as described above, the on-off valve 55b provided on the inert gas supply pipe 54b is opened to slightly supply the inert gas nitrogen N2 to the fuel injection nozzle 50b.

[0039] In this way, when the fuel switching valve 52b is closed, the hydrogen gas H2 remaining in the fuel injection nozzle 50b is ejected into the furnace R2 and driven out, so that backfire can be prevented.

[0040] In addition, when the air Air in the furnace R2 is prevented from flowing into the fuel injection nozzle 50b and hydrogen H2 is supplied to the fuel injection valve 50b and combustion is performed in the regenerative burner 40B on the other side, it is possible to prevent the hydrogen H2 supplied to the fuel injection nozzle 50b from mixing with the air Air flowing into the fuel injection nozzle 50b and causing an explosion in the fuel injection nozzle 50b.

[0041] Furthermore, by circulating nitrogen gas N2 at room temperature, it is possible to prevent excessive temperature rise in the thin fuel injection nozzle 50b, and to prevent the fuel injection nozzle 50b from being deformed due to heat.

[0042] Furthermore, in the heat storage combustion equipment of embodiment 2, hydrogen H2 is used as the fuel. Therefore, even if the hydrogen H2 is not completely burned when switching between the combustion action and the heat storage action, and a part of the hydrogen H2 remains, smoke will not be generated like the existing fossil fuels, and the treated object (not shown) will not be contaminated. Furthermore, the combustibility of hydrogen H2 is very high. Therefore, even if unburned hydrogen H2 is generated, it will be quickly burned after switching by being injected into the air Air in the furnace R2 from the supply and exhaust ports 41a, 41b.

[0043] Thus, in the regenerative combustion equipment of the second embodiment, in the paired regenerative burners 40A and 40B, when switching between the combustion action and the regenerative action as described above, the switching between the combustion action and the regenerative action is performed simultaneously, such as Figure 5 As shown, the timing of switching the supply and stop of hydrogen H2 from the fuel injection nozzles 50a and 50b to the furnace R2 by the fuel switching valves 52a and 52b can be synchronized with the timing of switching the supply and stop of air Air from the respective supply and exhaust ports 41a and 41b in the respective regenerative burners 40A and 40B to the furnace R2 by the supply valves 63a and 63b provided on the air supply pipe 62. As a result, Figure 5As shown, the temperature in the furnace R2 is kept constant, and the object to be processed (not shown) can be processed at a stable temperature in the furnace R2.

[0044] In addition, in the regenerative combustion equipment of the present embodiment 2, although when the air Air in the furnace R2 flows into the fuel injection nozzles 50a, 50b that stop the combustion action and the combustion action is performed as described above, in order to prevent the hydrogen H2 supplied to the fuel injection nozzles 50a, 50b from mixing with the air Air flowing into the fuel injection nozzles 50a, 50b and causing an explosion in the fuel injection nozzles 50a, 50b, the inert gas nitrogen N2 is supplied from the inert gas supply pipes 54a, 54b to the fuel injection nozzles 50a, 50b that stop the combustion action, it is not necessarily necessary to supply the inert gas nitrogen N2 from the inert gas supply pipes 54a, 54b to the fuel injection nozzles 50a, 50b.

[0045] For example, Figure 6 As shown, the fuel switching valves 52a, 52b for switching the supply and stop of hydrogen H2 to the fuel injection nozzles 50a, 50b are arranged near the nozzles 53a, 53b at the fuel injection nozzles 50a, 50b, which can reduce the volume of the air Air in the furnace R2 flowing into the fuel injection nozzles 50a, 50b where the combustion action is stopped.

[0046] In this way, when the amount of air Air flowing from the furnace R2 into the fuel injection nozzles 50a, 50b becomes extremely small and combustion operation is performed, the hydrogen gas H2 supplied to the fuel injection nozzles 50a, 50b can be suppressed from exploding in the fuel injection nozzles 50a, 50b.

Claims

1. A regenerative hydrogen combustion device, characterized in that: Air supply and exhaust ports are provided on both sides of a fuel injection nozzle for spraying hydrogen into the furnace, and a combustion action and a heat storage action are performed alternately. In the combustion action, air heated in a heat storage section accommodating a heat storage body is sprayed into the furnace from the air supply and exhaust ports on one side, and the hydrogen sprayed into the furnace from the fuel injection nozzle is burned. In the heat storage action, a combustion exhaust gas after the fuel is burned in the furnace is guided to the heat storage section through the air supply and exhaust ports on the other side, and the heat of the combustion exhaust gas is stored in the heat storage body accommodated in the heat storage section.

2. The regenerative hydrogen combustion equipment according to claim 1, characterized in that: The operation of injecting the air heated in the heat storage unit storing the heat storage body from one of the air supply and exhaust ports into the furnace and the operation of guiding the air into the heat storage unit through the other air supply and exhaust port are switched simultaneously.

3. A regenerative hydrogen combustion device, characterized in that: The regenerative burners are arranged in pairs, and the regenerative burners have a fuel injection nozzle and an air supply and exhaust port. The fuel injection nozzle sprays hydrogen into the furnace, and the air supply and exhaust port sprays air heated in a heat storage part containing a regenerative body into the furnace, and guides the combustion exhaust gas after the fuel is burned in the furnace to the heat storage part so that the heat of the combustion exhaust gas is stored in the regenerative body. In one regenerative burner, a combustion operation is performed in which hydrogen is ejected from a fuel ejection nozzle into a furnace, and air heated by passing through a regenerative portion containing a regenerative body is ejected from an air supply and exhaust port into the furnace, and the hydrogen and air are mixed and burned in the furnace. In the regenerative burner on the other side, a regenerative action is performed. In the regenerative action, the injection of hydrogen into the furnace from the fuel injection nozzle is stopped, and the combustion exhaust gas after the fuel is burned in the furnace is guided to the regenerative section, so that the heat of the combustion exhaust gas is accumulated in the regenerative body accommodated in the regenerative section. In the paired regenerative burners, the combustion action and the regenerative action are performed alternately.

4. The regenerative hydrogen combustion equipment according to claim 3, characterized in that: When switching the combustion action and the heat storage action in the paired regenerative burners, the action of ejecting the air heated in the heat storage unit containing the heat storage body from one supply and exhaust port into the furnace and the action of guiding the air to the heat storage unit through the other supply and exhaust port are switched simultaneously.

5. The regenerative hydrogen combustion equipment according to claim 3 or 4, characterized in that: A fuel switching valve is provided for switching the supply and stop of hydrogen gas to the fuel injection nozzle, and an inert gas supply pipe is provided for supplying inert gas to the fuel injection nozzle, and the inert gas is supplied from the inert gas supply pipe to the fuel injection nozzle whose hydrogen supply has been stopped by the fuel switching valve.

6. The regenerative hydrogen combustion equipment according to claim 3 or 4, characterized in that: A fuel switching valve for switching supply and stop of hydrogen gas to the fuel injection nozzle is provided near a discharge port of the fuel injection nozzle.

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