Thermal energy storage hydrogen combustion equipment

Abstract

To solve the problem of soot generation resulting from incomplete fuel combustion in a heat storage type combustion facility comprising a pair of heat storage type combustion burners alternately carrying out a combustion operation and a heat storing operation.SOLUTION: A heat storage type hydrogen combustion facility provided with air intake and exhaust ports 20a, 20b on either side of a fuel injection nozzle 10 injecting H2 into a furnace R1, is characterized by alternately carrying out a combustion operation of injecting air "Air" heated in heat storage units 33a, 33b housing heat storing bodies 34a, 34b into the furnace from one of the air-intake and exhaust ports to combust hydrogen injected into the furnace from the fuel injection nozzle, and a heat storing operation of guiding combustion exhaust resulting from combusting fuel in the furnace to the heat storage unit via the other of the air-intake and exhaust ports, allowing the heat storing body housed in the heat storage unit to store the heat of the combustion exhaust.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a regenerative hydrogen combustion facility that ejects fuel into a furnace from a fuel injection nozzle, ejects heated air from an air supply and exhaust port into the furnace through a heat storage section containing a heat storage body, mixes the fuel with the air, and burns the mixture in the furnace, and performs a heat storage operation of guiding combustion exhaust gas after the fuel is burned in the furnace from the air supply and exhaust port to the heat storage section and storing the heat of the combustion exhaust gas in the heat storage body contained in the heat storage section, using hydrogen as the fuel.

Background Art

[0002] Conventionally, in industrial furnaces for heat-treating various workpieces such as steel materials, in order to effectively utilize the heat of combustion exhaust gas generated by burning fuel in the furnace, fuel is ejected into the furnace from a fuel injection nozzle, and at the same time, heated air is ejected into the furnace from an air supply and exhaust port through a heat storage section containing a heat storage body, and a combustion operation of mixing the fuel with the air and burning it in the furnace, and a heat storage operation of guiding combustion exhaust gas after the fuel is burned in the furnace from the air supply and exhaust port to the heat storage section and storing the heat of the combustion exhaust gas in the heat storage body contained in the heat storage section are performed. A regenerative combustion facility is known.

[0003] And as such a regenerative combustion facility, as shown in Patent Document 1, air supply and exhaust ports are provided on both sides of a fuel injection nozzle, and heated air in a heat storage section containing a heat storage body is ejected into the furnace from one air supply and exhaust port to perform a combustion operation of burning fuel ejected into the furnace from the fuel injection nozzle. On the other hand, a heat storage operation of guiding combustion exhaust gas after the fuel is burned in the furnace through the other air supply and exhaust port to the heat storage section and storing the heat of the combustion exhaust gas in the heat storage body contained in the heat storage section is alternately performed.

[0004] Furthermore, as shown in Patent Document 2, a pair of regenerative combustion burners are provided, each having a fuel injection nozzle for injecting fuel into the furnace, and an intake / exhaust port that performs the operation of injecting air heated in a heat storage section containing a heat storage body into the furnace, and the operation of guiding the combustion exhaust gas after the fuel has been burned in the furnace into the heat storage section to store the heat of the combustion exhaust gas in the heat storage body contained in the heat storage section. In one of the regenerative combustion burners, fuel is injected into the furnace from the fuel injection nozzle, and the heat storage section containing the heat storage body is also provided. In one type of combustion burner, heated air is blown into the furnace through the intake and exhaust ports to mix the fuel with the air and burn it in the furnace. In the other type of regenerative combustion burner, the injection of fuel into the furnace from the fuel injection nozzle is stopped, and the combustion exhaust gas after the fuel has been burned in the furnace is guided to a heat storage section to store the heat of the combustion exhaust gas in a heat storage element housed in the heat storage section. In this type of regenerative combustion burner, the combustion operation and the heat storage operation are alternately switched between in a pair.

[0005] In conventional regenerative combustion equipment, the regenerative combustion burners described above generally use fossil fuels such as hydrocarbon gases as fuel.

[0006] Here, as shown in Patent Document 1, when a combustion operation is performed in which fossil fuels such as hydrocarbon gases are ejected from a fuel injection nozzle and heated air from a heat storage section containing a heat storage element is injected into the furnace from one intake / exhaust port to burn the fuel injected into the furnace from the fuel injection nozzle, and a heat storage operation is performed in which the combustion exhaust gas after the fuel has been burned in the furnace is guided to the heat storage section through the other intake / exhaust port to store the heat of the combustion exhaust gas in the heat storage element contained in the heat storage section, there is a problem that when switching between these operations, there is a temporary shortage of air, and the fossil fuel ejected into the furnace from the fuel injection nozzle is not completely burned, resulting in the generation of soot and contamination of the material to be processed.

[0007] Furthermore, as shown in Patent Document 2, in one regenerative combustion burner, fossil fuel is injected into the furnace from a fuel injection nozzle, and heated air is injected into the furnace from an intake / exhaust port through a heat storage section containing a heat storage body, mixing the fossil fuel with the air and burning it in the furnace. On the other hand, in the other regenerative combustion burner, the injection of fuel from the fuel injection nozzle into the furnace is stopped, and the combustion exhaust gas after the fossil fuel has been burned in the furnace is guided to the heat storage section to store the heat of the combustion exhaust gas in the heat storage body contained in the heat storage section. In this case, the pair of regenerative combustion burners alternately switch between combustion and heat storage operations. However, there is a problem that air is temporarily insufficient, and when switching between combustion and heat storage operations, the fossil fuel injected into the furnace from the fuel injection nozzle is not completely burned, generating soot and contaminating the material being processed.

[0008] Furthermore, in the case shown in Patent Document 2, as shown in Figure 1, in one regenerative combustion burner 1A, a combustion operation is performed in which fossil fuel G such as hydrocarbon gas is injected into the furnace R from a fuel injection nozzle 2a, and heated air Air is injected into the furnace R from an intake / exhaust port 5a through a heat storage section 4a containing a heat storage body 3a, mixing the fossil fuel G with the air Air and burning it in the furnace R. In the other regenerative combustion burner 1B, the injection of fossil fuel G into the furnace R from the fuel injection nozzle 2b is stopped, and the combustion exhaust gas after the fossil fuel G has been burned in the furnace R is guided from the intake / exhaust port 5b to the heat storage section 4b, and the heat of the combustion exhaust gas is stored in the heat storage body 3b contained in the heat storage section 4b. When switching between these two operations, as shown in Figure 2, in both regenerative combustion burners 1A and 1B, at the time the combustion operation is started In this system, first, heated air is injected into the furnace R from the intake and exhaust ports 5a and 5b through the heat storage sections 4a and 4b containing the heat storage elements 3a and 3b, and then fossil fuel G is injected into the furnace R from the fuel injection nozzles 2a and 2b to start combustion. However, at the time when the heat storage operation starts, the injection of fossil fuel G into the furnace R from the fuel injection nozzles 2a and 2b is stopped first, and then the operation of injecting heated air through the heat storage sections 4a and 4b containing the heat storage elements 3a and 3b into the furnace R from the intake and exhaust ports 5a and 5b is stopped. This ensures that when fossil fuel G is injected into the furnace R from the fuel injection nozzles 2a and 2b, there is always enough heated air injected into the furnace R from the intake and exhaust ports 5a and 5b to suppress the generation of soot during combustion.

[0009] However, this approach results in periods where no combustion occurs in either the regenerative combustion burner 1A or 1B. As shown in Figure 2, during these times, the temperature inside the furnace R decreases, causing temperature fluctuations and making it impossible to heat-treat the workpiece at an appropriate temperature. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Patent No. 4602858 [Patent Document 2] Patent No. 3159606 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0011] The present invention aims to solve the aforementioned problems in a regenerative combustion system that performs a combustion operation in which fuel is injected into the furnace from a fuel injection nozzle, and heated air is injected into the furnace from an intake / exhaust port through a heat storage section containing a heat storage element, mixing the fuel with the air and burning it in the furnace, and a heat storage operation in which the combustion exhaust gas after the fuel has been burned in the furnace is guided from the intake / exhaust port to the heat storage section and the heat of the combustion exhaust gas is stored in the heat storage element contained in the heat storage section. [Means for solving the problem]

[0012] In the first regenerative hydrogen combustion equipment according to the present invention, in order to solve the above-mentioned problems, intake and exhaust ports are provided on both sides of the fuel injection nozzle that injects hydrogen into the furnace, and a combustion operation is performed in which heated air from the heat storage section containing the heat storage body is injected into the furnace from one intake and exhaust port to burn the hydrogen injected into the furnace from the fuel injection nozzle, while the combustion exhaust gas after the hydrogen has been burned in the furnace is guided to the heat storage section through the other intake and exhaust port to store the heat of the combustion exhaust gas in the heat storage body contained in the heat storage section, and the heat storage operation is performed while injecting hydrogen into the furnace from the fuel injection nozzle.

[0013] In the first regenerative hydrogen combustion facility described above, since hydrogen is used as the fuel injected into the furnace from the fuel injection nozzle, even if the hydrogen injected into the furnace from the fuel injection nozzle is not completely burned, soot is not generated as with conventional fossil fuels, thus preventing contamination of the material being processed. Furthermore, even if the combustion operation and heat storage operation are switched as described above while hydrogen is injected into the furnace from the fuel injection nozzle, hydrogen is highly flammable, so any unburned hydrogen is quickly burned.

[0014] Furthermore, in the first regenerative hydrogen combustion equipment described above, if the operation of injecting air heated in the heat storage section containing the heat storage element into the furnace from one intake / exhaust port and the operation of guiding the air to the heat storage section through the other intake / exhaust port are switched simultaneously, even if the hydrogen ejected into the furnace from the fuel injection nozzle is not completely burned during the switch, soot will not be generated as described above, thus preventing contamination of the material being processed. In addition, because hydrogen is highly flammable, any unburned hydrogen will be quickly burned.

[0015] Also, Reference InventionIn the second regenerative hydrogen combustion equipment relating to the above, in order to solve the above-mentioned problems, a pair of regenerative combustion burners are provided, each having a fuel injection nozzle for injecting hydrogen into the furnace, and an intake / exhaust port that performs the operation of injecting air heated in a heat storage section containing a heat storage body into the furnace, and the operation of guiding the combustion exhaust gas after the combustion of hydrogen in the furnace into the heat storage section to store the heat of the combustion exhaust gas in the heat storage body contained in the heat storage section. In one of the regenerative combustion burners, hydrogen is injected into the furnace from the fuel injection nozzle, and air heated through the heat storage section containing the heat storage body is guiding into the furnace from the intake / exhaust port. One fuel injection nozzle injects hydrogen into the furnace, mixing it with air for combustion. In the other regenerative combustion burner, the injection of hydrogen into the furnace from the fuel injection nozzle is stopped, and the combustion exhaust gas remaining after the hydrogen has been burned in the furnace is guided to the heat storage section, where the heat from the combustion exhaust gas is stored in the heat storage element. In this pair of regenerative combustion burners, when switching between combustion and heat storage operations, the injection of hydrogen into the furnace from one fuel injection nozzle and the stopping of the injection of hydrogen into the furnace from the other fuel injection nozzle are performed simultaneously.

[0016] Here, in the second regenerative hydrogen combustion facility, as with the first regenerative hydrogen combustion facility described above, hydrogen is used as the fuel injected into the furnace from the fuel injection nozzle. Therefore, even if the hydrogen injected into the furnace from the fuel injection nozzle is not completely burned, soot is not generated as with conventional fossil fuels, thus preventing contamination of the material being processed. Furthermore, because hydrogen is highly flammable, any unburned hydrogen is quickly burned.

[0017] Furthermore, in the second regenerative hydrogen combustion equipment described above, when switching between the combustion operation and the heat storage operation of the paired regenerative combustion burners, if the operation of injecting air heated in the heat storage section containing the heat storage material into the furnace from one intake / exhaust port and the operation of guiding the air to the heat storage section through the other intake / exhaust port are switched simultaneously, even if the hydrogen ejected into the furnace from the fuel injection nozzle in the combustion state remains unburned during the switch, soot will not be generated as described above, thus preventing contamination of the material to be processed. Moreover, because hydrogen is highly flammable, any unburned hydrogen will be quickly burned by the combustion operation of the other regenerative combustion burner.

[0018] Furthermore, in the second regenerative hydrogen combustion equipment described above, it is preferable to provide a fuel switching valve for switching between supplying and stopping hydrogen to the fuel injection nozzle, and an inert gas supply pipe for supplying inert gas to the fuel injection nozzle, and to supply inert gas from the inert gas supply pipe to the fuel injection nozzle from which the hydrogen supply has been stopped by the fuel switching valve. In this way, inert gas is supplied into the fuel injection nozzle when the combustion operation is stopped, preventing air in the furnace from flowing into the fuel injection nozzle, and when hydrogen is supplied into the fuel injection nozzle to perform the combustion operation next, 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] Furthermore, in the second regenerative hydrogen combustion equipment described above, it is preferable to provide a fuel switching valve, which switches between supplying and stopping hydrogen to the fuel injection nozzle, near the nozzle of the fuel injection nozzle. By providing the fuel switching valve near the nozzle of the fuel injection nozzle in this way, when the fuel switching valve is closed, the space between the fuel injection nozzle, which has stopped combustion, and the fuel switching valve becomes smaller, and the amount of air from inside the furnace that flows into the fuel injection nozzle can be greatly reduced. When hydrogen is supplied into the fuel injection nozzle to perform combustion, the hydrogen mixes with the air inside the fuel injection nozzle, which suppresses the occurrence of an explosion inside the fuel injection nozzle.

Advantages of the Invention

[0020] In the regenerative hydrogen combustion equipment of the present invention, as described above, by using hydrogen as the fuel ejected into the furnace from the fuel injection nozzle, even if the hydrogen ejected into the furnace from the fuel injection nozzle is not completely burned, there will be no generation of soot, and it is possible to prevent the object to be treated from being soiled. In addition, since hydrogen has a very high combustibility, even if unburned hydrogen is generated, it will be burned promptly. First

[0021] As a result, when switching between the combustion operation and the heat storage operation, fluctuations in the furnace temperature can be eliminated.

Brief Description of the Drawings

[0022] [Figure 1] It is a schematic cross-sectional explanatory view showing a conventional regenerative combustion equipment. [Figure 2] <000C093>In a pair of regenerative combustion burners 1A and 1B in a conventional regenerative combustion equipment, it shows the relationship between the timing of ejecting fossil fuel into the furnace from the fuel injection nozzle and the timing of ejecting air into the furnace from the air supply and exhaust port, the timing of stopping ejecting fossil fuel into the furnace from the fuel injection nozzle, the timing of stopping ejecting air into the furnace from the air supply and exhaust port, and the change in the furnace temperature. [Figure 3] It is a schematic cross-sectional explanatory view showing the regenerative hydrogen combustion equipment in Embodiment 1 of the present invention. [Figure 4] It is a schematic cross-sectional explanatory view showing the regenerative hydrogen combustion equipment in Reference Embodiment 2 according to the reference invention. [Figure 5] In a pair of regenerative combustion burners 40A and 40B in the regenerative hydrogen combustion equipment in the above-mentioned Reference Embodiment 2, it shows the relationship between the timing of ejecting hydrogen into the furnace from the fuel injection nozzle and the timing of ejecting air into the furnace from the air supply and exhaust port, the timing of stopping ejecting hydrogen into the furnace from the fuel injection nozzle, the timing of stopping ejecting air into the furnace from the air supply and exhaust port, and the change in the furnace temperature. [Figure 6] [Figure 6] This schematic cross-sectional diagram shows an example of a modification to the regenerative hydrogen combustion equipment in Reference Embodiment 2 described above, in which a fuel switching valve for switching between supplying and stopping hydrogen to the fuel injection nozzle is installed near the nozzle opening of the fuel injection nozzle. [Best Mode for Carrying Out the Invention]

[0023] Hereinafter, a regenerative hydrogen combustion system according to an embodiment of the present invention will be specifically described with reference to the attached drawings. It should be noted that the regenerative hydrogen combustion system according to the present invention is not limited to those shown in the embodiments below, and can be modified as appropriate without altering the essence of the invention.

[0024] (Embodiment 1) In the regenerative combustion equipment of Embodiment 1, as shown in Figure 3, a fuel switching valve 12 provided in the fuel supply pipe 11 that supplies hydrogen H2 is opened to guide hydrogen H2 through the fuel supply pipe 11 to the fuel injection nozzle 10, and the hydrogen H2 is injected into the furnace R1 from the nozzle 13 at the tip of the fuel injection nozzle 10. Here, the fuel switching valve 12 and the various valves described later are shown in white when open and in black when closed.

[0025] Furthermore, two intake and exhaust ports 20a and 20b are provided on either side of the nozzle 13 at the tip of the fuel injection nozzle 10 located in the reactor R1.

[0026] On one side of the intake / exhaust port 20a, as shown in Figure 3, air is supplied to the air supply pipe 31 by a blower 21, and one supply valve 32a provided on the air supply pipe 31 is opened to guide the air to one heat storage unit 33a, where the air is heated by the heated heat storage body 34a inside the heat storage unit 33a, and the heated air is injected into the furnace R1 from one of the intake / exhaust ports 20a to perform a combustion operation in which hydrogen H2 injected into the furnace R1 from the fuel injection nozzle 10 is burned. During this combustion operation in which air is supplied into the heat storage unit 33a to burn hydrogen H2, one exhaust valve 36a provided on the exhaust pipe 35 that discharges combustion exhaust gas from inside the heat storage unit 33a is closed.

[0027] On the other hand, on the other side of the intake / exhaust port 20b, as shown in Figure 3, the other supply valve 32b provided in the air supply pipe 31 is closed to prevent air from being guided to the other heat storage unit 33b. At the same time, the exhaust valve 36b provided in the exhaust pipe 35 that discharges combustion exhaust gas from the heat storage unit 33b is opened, and the combustion exhaust gas after burning hydrogen H2 is drawn in by the suction blower 22 and guided from the furnace R1 through the intake / exhaust port 20b to the other heat storage unit 33b. After a heat storage operation is performed in which the heat of the combustion exhaust gas is stored in the heat storage body 34b in this heat storage unit 33b, the combustion exhaust gas is then guided through the exhaust pipe 35 to the exhaust tower 36 and exhausted.

[0028] In this embodiment 1 of the regenerative combustion equipment, as described above, hydrogen H2 is injected into the furnace R1 from the fuel injection nozzle 10 while simultaneously and alternately switching between the combustion operation on one of the intake / exhaust port 20a and the heat storage operation on the other intake / exhaust port 20b.

[0029] In this embodiment 1 of the regenerative combustion equipment, as described above, hydrogen H2 is injected into the furnace R1 from the fuel injection nozzle 10 and burned. Therefore, when switching between the combustion operation on one intake / exhaust port 20a and the heat storage operation on the other intake / exhaust port 20b, even if there is a temporary shortage of air and the hydrogen H2 is not completely burned, leaving some hydrogen H2 behind, soot is not generated as with conventional fossil fuels, and the material to be processed (not shown) is not contaminated. Furthermore, because hydrogen H2 is highly flammable, even if unburned hydrogen H2 is produced, it is quickly burned by the air injected into the furnace R1 from the intake / exhaust ports 20a and 20b after the switchover.

[0030] ( Reference form 2 ) Reference form 2 In the regenerative combustion equipment, as shown in Figure 4, a pair of regenerative combustion burners 40A and 40B are installed facing each other towards the inside of the furnace R2.

[0031] In the paired regenerative combustion burners 40A and 40B described above, the fuel switching valves 52a and 52b provided in the respective fuel supply pipes 51a and 51b that supply hydrogen H2 are opened to guide hydrogen H2 through the fuel supply pipes 51a and 51b to the respective fuel injection nozzles 50a and 50b, and the hydrogen H2 is injected into the furnace R2 from the nozzles 53a and 53b at the tips of the respective fuel injection nozzles 50a and 50b. Note that, as in Embodiment 1 described above, the open state of the fuel switching valves 52a and 52b and the various valves described later are shown in white and the closed state in black.

[0032] Furthermore, inert gas supply pipes 54a and 54b are provided to supply nitrogen N2 as an inert gas to the fuel injection nozzles 50a and 50b, respectively. On / off valves 55a and 55b are also provided to each inert gas supply pipe 54a and 54b, respectively, and the supply and cessation of nitrogen N2 to each fuel injection nozzle 50a and 50b are controlled by opening and closing the on / off valves 55a and 55b.

[0033] and, Reference form 2In the regenerative combustion equipment, air is supplied from a blower 61 to an air supply pipe 62. Supply valves 63a and 63b are provided in the air supply pipe 62, corresponding to the heat storage sections 42a and 42b of each regenerative combustion burner 40A and 40B. By opening and closing the supply valves 63a and 63b, the supply of air to each heat storage section 42a and 42b is switched on and off, causing the air to be injected into the furnace R2 through the heat storage sections 42a and 42b from the intake and exhaust ports 41a and 41b of each regenerative combustion burner 40A and 40B.

[0034] Furthermore, the combustion exhaust gas remaining after the combustion of hydrogen H2 in the furnace R2 is drawn in by a suction blower 64 and guided to the respective heat storage units 42a and 42b through the respective intake and exhaust ports 41a and 41b of each regenerative combustion burner 40A and 40B. The combustion exhaust gas guided to the respective heat storage units 42a and 42b is then guided to the exhaust pipe 65. The exhaust valves 66a and 66b provided in the exhaust pipe 65 are opened to guide the combustion exhaust gas from the respective heat storage units 42a and 42b through the exhaust pipe 65 to the exhaust tower 67 for exhaust.

[0035] In the regenerative combustion burner 40A, air is supplied from the blower 61 to the air supply pipe 62, and one of the supply valves 63a provided in the air supply pipe 62 is opened to guide the air to the heat storage section 42a of the regenerative combustion burner 40A. The air is heated by the heated heat storage body 43a in the heat storage section 42a, and the heated air is injected into the furnace R2 from the intake / exhaust port 41a of the regenerative combustion burner 40A. At the same time, the fuel switching valve 52a provided in the fuel supply pipe 51a is opened to supply hydrogen H2 to the fuel injection nozzle 50a, and hydrogen H2 is injected into the furnace R1 from the nozzle 53a at the tip of the fuel injection nozzle 50a to perform a combustion operation in which hydrogen H2 is burned.

[0036] In this configuration, one regenerative combustion burner 40A, which performs a combustion operation in which heated air (Air) through the heat storage unit 42a is injected into the furnace R2 from the intake / exhaust port 41a to burn hydrogen (H2), closes one exhaust valve 66a on the exhaust pipe 65 that discharges the combustion exhaust gas from the heat storage unit 42a, and also closes the on / off valve 55a on the inert gas supply pipe 54a to prevent the supply of inert gas nitrogen (N2) into the fuel injection nozzle 50a.

[0037] Meanwhile, in the other regenerative combustion burner 40B, which does not perform combustion, the fuel switching valve 52b provided in the fuel supply pipe 51b is closed to prevent hydrogen H2 from being supplied to the fuel injection nozzle 50b, and the supply valve 63b provided in the air supply pipe 62 is closed to prevent air from being introduced into the heat storage section 42b of this regenerative combustion burner 40B. In this state, combustion exhaust gas is discharged from within the heat storage section 42b. The exhaust valve 66b installed in the exhaust pipe 65 is opened, and the combustion exhaust gas remaining after hydrogen H2 has been burned in the furnace R2 is drawn in by the suction blower 64 and guided through the intake and exhaust port 41b of the regenerative combustion burner 40B to the heat storage section 42b. After a heat storage operation is performed in which the heat of the combustion exhaust gas is stored in the heat storage body 43b housed in the heat storage section 42b, the combustion exhaust gas is guided through the exhaust pipe 65 to the exhaust tower 67 and exhausted.

[0038] In this configuration, hydrogen H2 is not supplied to the fuel injection nozzle 50b as described above, and the combustion exhaust gas from the furnace R2 is guided to the heat storage unit 42b to store the heat of the combustion exhaust gas in the heat storage body 43b housed in the heat storage unit 42b. In this other regenerative combustion burner 40B, the on / off valve 55b provided in the inert gas supply pipe 54b is opened to supply a small amount of inert gas nitrogen N2 to the fuel injection nozzle 50b.

[0039] In this way, when the fuel switching valve 52b is closed, the hydrogen H2 remaining in the fuel injection nozzle 50b is ejected into the reactor R2, thereby preventing flashback.

[0040] Furthermore, air in the furnace R2 is prevented from flowing into the fuel injection nozzle 50b, and in the other regenerative combustion burner 40B, when hydrogen H2 is supplied to the fuel injection nozzle 50b for combustion, the hydrogen H2 supplied to the fuel injection nozzle 50b mixes with the air that has flowed into the fuel injection nozzle 50b, preventing an explosion from occurring within the fuel injection nozzle 50b.

[0041] Furthermore, by flowing nitrogen N2 at room temperature, overheating of the narrow fuel injection nozzle 50b is prevented, and deformation of the fuel injection nozzle 50b due to heat can be prevented.

[0042] Also, Reference form 2 In the regenerative combustion equipment, by using hydrogen (H2) as fuel, even if the hydrogen (H2) is not completely burned during the switch between combustion and heat storage operations and some hydrogen (H2) remains, soot is not generated as with conventional fossil fuels, and the material being processed (not shown) is not contaminated. Furthermore, because hydrogen (H2) is highly flammable, even if unburned hydrogen (H2) is produced, it is quickly burned by the air injected into the furnace R2 from the intake and exhaust ports 41a and 41b after the switchover.

[0043] If you do this, Reference form 2In the regenerative combustion equipment, the pair of regenerative combustion burners 40A and 40B switch between combustion and heat storage operations as described above, but the switching between combustion and heat storage operations is performed simultaneously. As shown in Figure 5, the timing of switching the supply and cessation of hydrogen H2 from the fuel injection nozzles 50a and 50b into the furnace R2 by the fuel switching valves 52a and 52b is made to coincide with the timing of switching the supply and cessation of air from the respective intake and exhaust ports 41a and 41b of each regenerative combustion burner 40A and 40B into the furnace R2 by the supply valves 63a and 63b provided in the air supply pipe 62. As a result, as shown in Figure 5, the temperature inside the furnace R2 is kept constant, and the material to be processed (not shown) can be processed at a stable temperature inside the furnace R2.

[0044] Also, this Reference form 2 In the regenerative combustion equipment described above, when air in the furnace R2 flows into the fuel injection nozzles 50a and 50b, which have stopped combustion, and combustion is performed, hydrogen H2 supplied to the fuel injection nozzles 50a and 50b mixes with the air that has flowed into the fuel injection nozzles 50a and 50b, and in order to prevent an explosion from occurring in the fuel injection nozzles 50a and 50b, inert gas nitrogen N2 is supplied to the fuel injection nozzles 50a and 50b, which have stopped combustion, from the inert gas supply pipes 54a and 54b. However, it is not necessarily required to supply inert gas nitrogen N2 to the fuel injection nozzles 50a and 50b from the inert gas supply pipes 54a and 54b.

[0045] For example, as shown in Figure 6, fuel switching valves 52a and 52b, which switch between supplying and stopping hydrogen H2 to fuel injection nozzles 50a and 50b, are installed near the nozzles 53a and 53b of the fuel injection nozzles 50a and 50b, thereby reducing the volume of air in the reactor R2 that flows into the fuel injection nozzles 50a and 50b when combustion is stopped.

[0046] In this way, the amount of air flowing from inside the reactor R2 into the fuel injection nozzles 50a and 50b is greatly reduced, which suppresses the explosion of hydrogen H2 supplied to the fuel injection nozzles 50a and 50b during combustion. [Explanation of Symbols]

[0047] 10: Fuel injection nozzle 11:Fuel supply pipe 12: Fuel switching valve 13: Spout 20a, 20b: Supply and exhaust ports 21: Blower 22: Suction blower 31: Air supply pipe 32a, 32b: Supply valve 33a, 33b: Heat storage part 34a, 34b: Heat storage material 35: Exhaust pipe 36: Exhaust tower 36a, 36b: Exhaust valve 40A, 40B: Regenerative combustion burner 41a, 41b: Supply / exhaust port 42a, 42b: Heat storage part 43a, 43b: Heat storage material 50a, 50b: Fuel injection nozzles 51a, 51b: Fuel supply pipe 52a, 52b: Fuel switching valve 53a,53b: spout 54a, 54b: Inert gas supply pipe 55a, 55b: Shut-off valves 61: Blower 62: Air supply pipe 63a, 63b: Supply valve 64: Suction blower 65: Exhaust pipe 66a, 66b: Exhaust valve 67: Exhaust tower Air: air H2: Hydrogen N2: Nitrogen (inert gas) R1: Furnace R2: Furnace

Claims

1. A regenerative hydrogen combustion system is characterized by having intake and exhaust ports on both sides of a fuel injection nozzle that injects hydrogen into the furnace, injecting heated air from one intake and exhaust port into the furnace to burn the hydrogen injected into the furnace from the fuel injection nozzle, and alternating between these operations: one in which combustion exhaust gas, after the fuel has been burned in the furnace, is guided to the heat storage unit through the other intake and exhaust port to store the heat of the combustion exhaust gas in the heat storage unit, while injecting hydrogen into the furnace from the fuel injection nozzle.

2. A regenerative hydrogen combustion apparatus according to claim 1, characterized in that it simultaneously switches between an operation to inject air heated in a heat storage section containing a heat storage element into the furnace from one intake / exhaust port and an operation to guide the air to the heat storage section through the other intake / exhaust port.

Images