TWI876968B - Regenerative hydrogen combustion equipment - Google Patents

Abstract

In the present invention, gas supply/exhaust ports (20a, 20b) are provided on two sides of a fuel injection nozzle (10) which injects hydrogen (H₂) into a furnace (R1), and a combustion operation is performed while a heat storage operation is alternatively performed, wherein the combustion operation injects air (Air) that has been heated in heat storage portions (33a, 33b) accommodated with heat storage bodies (34a, 34b) into the furnace from one of the gas supply/exhaust ports and burns hydrogen that is injected into the furnace from the fuel injection nozzle, and the heat storage operation guides combustion exhaust gas after the fuel has been combusted inside the furnace to the heat storage portions through the other of the gas supply/exhaust ports, and stores heat of the combustion exhaust gas in the heat storage bodies accommodated in the heat storage portions.

Description

Regenerative hydrogen combustion equipment

The present invention relates to a heat storage type hydrogen combustion device, which uses hydrogen in fuel. The heat storage type combustion device performs: a combustion action, in which fuel is ejected from a fuel ejection nozzle into a furnace, and air heated by passing through a heat storage part containing a heat storage body is ejected from a supply/exhaust port into the furnace, so that the fuel and air are mixed and burned in the furnace; and a heat storage action, in which combustion exhaust gas after the fuel is burned in the furnace is guided from the supply/exhaust port 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.

In the past, in industrial furnaces that heat various processed materials such as steel, a heat storage type combustion device is known. In order to effectively utilize the heat of the combustion exhaust gas after the fuel is burned in the furnace, the heat storage type combustion device performs: a combustion action, in which the fuel is sprayed into the furnace from the fuel spray nozzle, and the air heated by passing through the heat storage part containing the heat storage body is sprayed into the furnace from the supply/exhaust port, so that the fuel and the air are mixed and burned in the furnace; and a heat storage action, in which the combustion exhaust gas after the fuel is burned in the furnace is guided from the supply/exhaust port 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.

Furthermore, as such a heat storage combustion device, there is known a device disclosed in Patent Document 1, which is to provide air supply/exhaust ports on both sides of a fuel injection nozzle, alternately inject air heated in a heat storage part containing a heat storage body from one air supply/exhaust port into a furnace, and burn the fuel injected from the fuel injection nozzle into the furnace, and on the other hand, to guide the combustion exhaust gas after the fuel is burned in the furnace to the heat storage part through the other air supply/exhaust port, and store the heat of the combustion exhaust gas in the heat storage body contained in the heat storage part.

In addition, as disclosed in Patent Document 2, a regenerative burner having a fuel injection nozzle and an air supply/exhaust port is known, wherein the fuel injection nozzle causes the fuel to be ejected into the furnace; the air supply/exhaust port causes the air heated in the heat storage section containing the heat storage body to be ejected into the furnace, and causes the combustion exhaust gas after the fuel is burned in the furnace to be guided to the heat storage section and causes the heat of the combustion exhaust gas to be stored in the heat storage body contained in the heat storage section; in one regenerative burner, the fuel is ejected from the fuel injection nozzle into the heat storage section; and the heat storage section is used to eject the fuel from the fuel injection nozzle into the heat storage section. In the furnace, the air heated by the heat storage part containing the heat storage body is ejected from the air supply/exhaust port into the furnace, and the fuel is mixed with the air and burned in the furnace. On the other hand, in the other regenerative burner, the action of ejecting the fuel from the fuel ejection nozzle into the furnace is stopped, and the combustion exhaust gas after the fuel is burned in the furnace is guided to the heat storage part and the heat of the combustion exhaust gas is stored in the heat storage body contained in the heat storage part. The combustion action and the heat storage action are alternately switched in the paired regenerative burners.

Here, in the known regenerative combustion equipment, in the regenerative burners as described above, fossil fuels such as hydrocarbon gas are generally used as fuel.

Here, as shown in the aforementioned patent document 1, when the structure is configured to alternately switch to allow fossil fuels such as hydrocarbon gas to be ejected from the fuel ejection nozzle, and to allow air heated in the heat storage portion containing the heat storage body to be ejected from one supply/exhaust port into the furnace, and to cause the fuel ejected from the fuel ejection nozzle into the furnace to burn, and to burn the fuel in the furnace, When the exhaust gas after combustion in the furnace is guided to the heat storage part through the other supply/exhaust port and the heat of the exhaust gas is stored in the heat storage body contained in the heat storage part, there will be a problem of temporary air shortage during the switching, and the fossil fuel ejected from the fuel injection nozzle into the furnace will not be completely burned, so soot will be generated, and the treated material will be polluted.

In addition, as shown in the aforementioned patent document 2, when the structure is such that in one regenerative burner, the fossil fuel is ejected from the fuel ejection nozzle into the furnace, and the air heated by passing through the heat storage part containing the heat storage body is ejected from the supply/exhaust port into the furnace, and the fossil fuel and the air are mixed and burned in the furnace, on the other hand, in the other regenerative burner, the action of ejecting the fuel from the fuel ejection nozzle into the furnace is stopped, and The combustion exhaust gas after the fossil fuel is burned in the furnace is guided to the heat storage part and the heat of the combustion exhaust gas is stored in the heat storage body contained in the heat storage part. When the combustion action and the heat storage action are alternately switched in the paired heat storage burners, there will be a temporary shortage of air. When switching the combustion action and the heat storage action, the fossil fuel ejected from the fuel injection nozzle into the furnace is not completely burned and soot is generated, causing the treated material to be contaminated.

Furthermore, the above-mentioned patent document 2 discloses the following contents: as shown in FIG. 1, when a fossil fuel G such as hydrocarbon gas is alternately ejected from a fuel ejection nozzle 2a into a furnace R in one regenerative burner 1A, and air Air heated by passing through a regenerative portion 4a containing a regenerative body 3a is ejected from an air supply/exhaust port 5a into the furnace R, and the fossil fuel G is mixed with the air Air and burned in the furnace R, The combustion action is stopped, and in the other regenerative burner 1B, the action of ejecting the fossil fuel G from the fuel ejection nozzle 2b into the furnace R is stopped, and the combustion exhaust gas after the fossil fuel G is burned in the furnace R is guided from the supply/exhaust port 5b to the heat storage part 4b and the heat of the combustion exhaust gas is stored in the heat storage body 3b accommodated in the heat storage part 4b. As shown in FIG. 2, in any regenerative burner 1A, 1B, at the start of combustion, the At the time of the burning operation, the air Air heated by passing through the heat storage parts 4a and 4b containing the heat storage bodies 3a and 3b is first ejected from the air supply/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 and starts to burn. On the other hand, at the time of starting the heat storage operation, the ejection of the fossil fuel G into the furnace R from the fuel ejection nozzles 2a and 2b is first stopped, and then the ejection of the fossil fuel G into the furnace R from the fuel ejection nozzles 2a and 2b is stopped. The air Air heated by the heat storage parts 4a and 4b of the heat storage bodies 3a and 3b is ejected from the air supply and exhaust ports 5a and 5b into the furnace R. When the fossil fuel G is ejected from the fuel ejection nozzles 2a and 2b into the furnace R, the air Air heated by the heat storage parts 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 not be insufficient, thereby suppressing the generation of coal smoke during combustion.

However, in this case, there will be a time when combustion is not carried out in any of the regenerative burners 1A and 1B, and as shown in FIG2 , at this time, the temperature in the furnace R will drop and the temperature in the furnace R will fluctuate, making it impossible to heat the processed material at an appropriate temperature.

[Prior Art Literature]

[Patent Literature]

Patent document 1: Japanese Patent No. 4602858

Patent document 2: Japanese Patent No. 3159606

The purpose of the present invention is to solve the above-mentioned problems in the heat storage type combustion equipment. The heat storage type combustion equipment is configured to perform: combustion action, which is to spray fuel from the fuel spray nozzle into the furnace, and make the air heated by passing through the heat storage part containing the heat storage body spray into the furnace from the supply/exhaust port, so that the fuel and air are mixed and burned in the furnace; and heat storage action, which is to guide the combustion exhaust gas after the fuel is burned in the furnace from the supply/exhaust port 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.

In the first heat storage hydrogen combustion device of the present invention, in order to solve the above-mentioned problem, air supply/exhaust ports are provided on both sides of the fuel injection nozzle that sprays hydrogen into the furnace, and a combustion action is performed and a heat storage action is performed alternately on the other hand. The combustion action is to spray the air heated in the heat storage part containing the heat storage body into the furnace from the air supply/exhaust port on one side, and to burn the hydrogen sprayed into the furnace from the fuel injection nozzle; the heat storage action is to guide the combustion exhaust gas after the hydrogen is burned in the furnace through the air supply/exhaust port on the other side to the heat storage part, and store the heat of the combustion exhaust gas in the heat storage body contained in the heat storage part.

Here, in the aforementioned first regenerative hydrogen combustion equipment, hydrogen is used as the fuel ejected from the fuel ejection nozzle into the furnace, so even if the hydrogen ejected from the fuel ejection nozzle into the furnace is not completely burned, soot will not be generated like the known fossil fuel, and the treated material will be prevented from being polluted. In addition, hydrogen has extremely high combustibility, so even if unburned hydrogen is generated, it will be burned quickly.

Furthermore, in the aforementioned first regenerative hydrogen combustion equipment, when the configuration is to switch simultaneously to eject the air heated in the heat storage part containing the heat storage body from one supply/exhaust port into the furnace and to guide the air to the heat storage part through the other supply/exhaust port, even if the hydrogen ejected from the fuel injection nozzle into the furnace is not completely burned and remains during the switching, the situation of soot as described above will not occur, and the treated material will be prevented from being contaminated. Moreover, the combustibility of hydrogen is extremely high, so even if unburned hydrogen is generated, it will be burned quickly.

In addition, in the second regenerative hydrogen combustion equipment of the present invention, in order to solve the above-mentioned problem, a regenerative burner having a fuel injection nozzle and a supply/exhaust port is arranged in pairs, the fuel injection nozzle causes hydrogen to be ejected into the furnace; the supply/exhaust port causes the air heated in the heat storage section containing the heat storage body to be ejected into the furnace, 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 regenerative burner on one side, hydrogen is discharged from the fuel and discharged into the furnace; The ejection nozzle ejects into the furnace, and the air heated by passing through the heat storage part containing the heat storage body is ejected into the furnace from the air supply/exhaust port, and hydrogen is mixed with air and burned in the furnace. On the other hand, in the other regenerative burner, the action of ejecting hydrogen into the furnace from the fuel ejection nozzle is stopped, and the combustion exhaust gas after hydrogen is burned in the furnace is guided to the heat storage part, and the heat of the combustion exhaust gas is stored in the heat storage body contained in the heat storage part. The combustion action and the heat storage action are alternately switched in the paired regenerative burners.

Here, in the second regenerative hydrogen combustion equipment, similarly to the first regenerative hydrogen combustion equipment, hydrogen is used in the fuel ejected from the fuel ejection nozzle into the furnace, so even if the hydrogen ejected from the fuel ejection nozzle into the furnace is not completely burned, there will be no soot as in the known fossil fuels, and the treated material will be prevented from being contaminated. Furthermore, hydrogen has extremely high combustibility, so even if unburned hydrogen is generated, it will be burned quickly.

Furthermore, when the second regenerative hydrogen combustion device is configured such that, when switching between the combustion action and the heat storage action in the paired regenerative burner, the action of ejecting the air heated in the heat storage part containing the heat storage body from the air supply/exhaust port on one side into the furnace and the action of guiding the air heated in the heat storage part through the air supply/exhaust port on the other side are performed simultaneously, In this case, even if the hydrogen ejected from the burning fuel injection nozzle into the furnace is not completely burned and remains during switching, there will be no soot as mentioned above, thus preventing the treated material from being contaminated. In addition, hydrogen has a very high combustibility, so even if unburned hydrogen is produced, it will be quickly burned by the combustion action in the other regenerative burner.

In addition, in the aforementioned second heat storage type hydrogen combustion equipment, it is preferred to provide a fuel switching valve for switching the supply and stop of hydrogen to the aforementioned fuel injection nozzle, and to provide an inert gas supply pipe for supplying inert gas to the aforementioned fuel injection nozzle, and to supply inert gas from the aforementioned inert gas supply pipe to the fuel injection nozzle where the supply of hydrogen is stopped by the aforementioned fuel switching valve. In this way, inert gas is supplied to the fuel injection nozzle that has stopped burning, preventing the air in the furnace from flowing into the aforementioned fuel injection nozzle, and when hydrogen is supplied to the fuel injection nozzle to perform combustion, it can prevent hydrogen from mixing with the air in the fuel injection nozzle and causing an explosion in the fuel injection nozzle.

Furthermore, in the second regenerative hydrogen combustion device, it is preferred that a fuel switching valve for switching between stopping and supplying hydrogen to the fuel injection nozzle be provided near an injection port in the fuel injection nozzle. In this way, if the aforementioned fuel switching valve is arranged near the injection port in the fuel injection nozzle, when the aforementioned fuel switching valve is closed, the space between the fuel injection nozzle which has stopped 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 reduced to a minimum, and when hydrogen is supplied to the fuel injection nozzle to perform the combustion action, the hydrogen can be suppressed from mixing with the air in the fuel injection nozzle, and an explosion can be suppressed from occurring in the fuel injection nozzle.

In the first and second regenerative hydrogen combustion devices of the present invention, as mentioned above, hydrogen is used in the fuel ejected from the fuel ejection nozzle into the furnace, so even if the hydrogen ejected from the fuel ejection nozzle into the furnace is not completely burned, there will be no soot, and the treated material will be prevented from being contaminated. In addition, hydrogen has extremely high combustibility, so even if unburned hydrogen is generated, it will be quickly burned.

This can eliminate temperature fluctuations in the furnace when switching between combustion and heat storage.

10,50a,50b: fuel injection nozzle

11,51a,51b: fuel supply pipe

12,52a,52b: Fuel switching valve

13,53a,53b: Spray outlet

20a, 20b: air supply/exhaust port

21,61: Air blower

22,64: Suction blower

31,62: Air supply pipe

32a,32b,63a,63b: Supply valve

33a, 33b, 42a, 42b: heat storage part

34a,34b,43a,43b: heat storage body

35,65: Exhaust pipe

36,67: Exhaust tower

36a,36b,66a,66b: Exhaust valve

40A, 40B: Regenerative burner

41a,41b: air supply/exhaust port

54a, 54b: Inert gas supply pipe

55a,55b: Open/Close valve

Air: Air

H ₂ : Hydrogen

_N2 : Nitrogen (inert gas)

R1, R2: Furnace

Figure 1 is a schematic cross-sectional view of a known regenerative combustion device.

FIG2 shows the relationship between the time when fossil fuel is ejected from the fuel ejection nozzle into the furnace and the time when air is ejected from the supply/exhaust port into the furnace in a pair of regenerative burners 1A and 1B in the known regenerative combustion equipment; the relationship between the time when fossil fuel is stopped from being ejected from the fuel ejection nozzle into the furnace and the time when air is stopped from being ejected from the supply/exhaust port into the furnace; and the change in the temperature in the furnace.

Figure 3 is a schematic cross-sectional view of the heat storage hydrogen combustion equipment of embodiment 1 of the present invention.

FIG4 is a schematic cross-sectional view showing the heat storage hydrogen combustion equipment of embodiment 2 of the present invention.

FIG5 shows the relationship between the time when hydrogen is ejected from the fuel ejection nozzle into the furnace and the time when air is ejected from the supply/exhaust port into the furnace in a pair of regenerative hydrogen burners 40A and 40B in the regenerative hydrogen combustion equipment of the aforementioned embodiment 2; the relationship between the time when hydrogen is stopped from being ejected from the fuel ejection nozzle into the furnace and the time when air is stopped from being ejected from the supply/exhaust port into the furnace; and the change in the temperature in the furnace.

FIG6 is a schematic cross-sectional view showing a modification of the heat storage hydrogen combustion equipment of the aforementioned embodiment 2, and showing a state in which a fuel switching valve is set near the injection port in the fuel injection nozzle, and the fuel switching valve switches the supply and stop of hydrogen to the fuel injection nozzle.

The following specifically describes the thermal storage hydrogen combustion equipment of the embodiment of the present invention according to the attached drawings. In addition, the thermal storage hydrogen combustion equipment of the present invention is not limited to the embodiment shown below, and can be appropriately modified and implemented within the scope of not changing the gist of the invention.

(Implementation Type 1)

In the regenerative combustion equipment of the embodiment 1, as shown in FIG3, the fuel switching valve 12 provided in the fuel supply pipe 11 for supplying hydrogen _H2 is opened, hydrogen _H2 is guided to the fuel injection nozzle 10 through the fuel supply pipe 11, and hydrogen _H2 is ejected into the furnace R1 from the injection port 13 at the front end of the fuel injection nozzle 10. Here, regarding the aforementioned fuel switching valve 12 or various valves described later, the open state is highlighted, and the closed state is displayed in black.

In addition, two air supply/exhaust ports 20a, 20b are provided on both sides of the injection port 13 at the front end of the fuel injection nozzle 10 provided in the furnace R1.

Furthermore, on the side of the air supply/exhaust port 20a on one side, as shown in FIG3, it is configured to supply air Air to the air supply pipe 31 by the air blower 21, and open the supply valve 32a provided on one side of the aforementioned air supply pipe 31, thereby guiding the air Air to the heat storage section 33a on one side, and making the aforementioned air Air heated by the heated heat storage body 34a in the heat storage section 33a, and making the heated air Air be ejected into the furnace R1 from the air supply/exhaust port 20a on one side, so that the combustion action of hydrogen _H2 ejected into the furnace R1 from the aforementioned fuel injection nozzle 10 is burned. In addition, during the combustion operation in which air Air is supplied to the heat storage section 33a and hydrogen _H2 is burned, the exhaust valve 36a provided on one side of the exhaust pipe 35 for discharging the combustion exhaust gas from the heat storage section 33a is closed.

On the other hand, on the other side of the air supply/exhaust port 20b, as shown in FIG. 3, the supply valve 32b on the other side provided in the air supply pipe 31 is closed so that the air Air is not guided to the other side of the heat storage part 33b, and on the other hand, the exhaust valve 36b provided in the exhaust pipe 35 for exhausting the combustion exhaust gas from the heat storage part 33b is opened, and the combustion hydrogen H is sucked by the suction blower 22. The combustion exhaust gas after ₂ is guided from the furnace R1 through the aforementioned supply/exhaust port 20b to the other side of the heat storage section 33b, and after the heat storage action of the heat storage body 34b in the heat storage section 33b, the aforementioned combustion exhaust gas is guided to the exhaust tower 36 through the aforementioned exhaust pipe 35 to be exhausted.

Furthermore, in the regenerative combustion equipment of this embodiment 1, as described above, hydrogen _H2 is ejected from the fuel injection nozzle 10 into the furnace R1 while simultaneously and alternately switching between the combustion operation on the supply/exhaust port 20a side on one side and the regenerative operation on the supply/exhaust port 20b side on the other side.

Here, in the regenerative combustion equipment of this embodiment 1, as described above, hydrogen H ₂ is ejected from the fuel injection nozzle 10 into the furnace R1 and burns. Therefore, when switching between the combustion operation on the supply/exhaust port 20a side and the regenerative operation on the supply/exhaust port 20b side, even if the air is temporarily insufficient and the hydrogen H ₂ is not completely burned, and a part of the hydrogen H ₂ remains, there will be no soot generation like the conventional fossil fuel, which will cause the treated material (not shown) to be polluted. Moreover, since hydrogen H ₂ has an extremely high combustibility, even if unburned hydrogen H ₂ is generated, , will also be rapidly burned after switching by the air Air sprayed into the furnace R1 from the air supply/exhaust ports 20a, 20b.

(Implementation Type 2)

In the regenerative hydrogen combustion equipment of embodiment 2, as shown in FIG4 , a pair of regenerative burners 40A and 40B are arranged to face each other toward the inside of the furnace R2.

Furthermore, in the aforementioned paired regenerative burners 40A, 40B, the fuel switching valves 52a, 52b provided in the fuel supply pipes 51a, 51b for supplying hydrogen ₂ are opened, hydrogen 2 is introduced to the fuel injection nozzles 50a, 50b through the fuel supply pipes 51a, 51b, and hydrogen ₂ is sprayed into the furnace R2 from the spray ports 53a, 53b at the front ends of the fuel injection _nozzles 50a, 50b. In addition, regarding the aforementioned fuel switching valves 52a, 52b or various valves described later, the opened state is highlighted and the closed state is displayed in black, similarly to the aforementioned embodiment 1.

In addition, inert gas supply pipes 54a and 54b for supplying nitrogen _N2 as an inert gas are provided for the fuel injection nozzles 50a and 50b, respectively, and opening and closing valves 55a and 55b are provided on the inert gas supply pipes 54a and 54b, respectively. By opening and closing the opening and closing valves 55a and 55b, the supply and stop of nitrogen _N2 to the fuel injection nozzles 50a and 50b are performed.

Furthermore, in the regenerative combustion equipment of the second embodiment, the air Air is supplied to the air supply pipe 62 by the air supply blower 61, and the supply valves 63a and 63b are respectively provided in the air supply pipe 62 in a manner corresponding to the heat storage parts 42a and 42b in the regenerative burners 40A and 40B, and the supply and stop of the air Air to the heat storage parts 42a and 42b are switched by opening and closing the supply valves 63a and 63b, and the air Air is ejected from the air supply/exhaust ports 41a and 41b in the regenerative burners 40A and 40B through the heat storage parts 42a and 42b into the furnace R2.

In addition, the exhaust gas after the hydrogen _H2 is burned in the furnace R2 is sucked by the suction blower 64, and is guided to the aforementioned heat storage parts 42a, 42b through the respective supply/exhaust ports 41a, 41b in the respective heat storage burners 40A, 40B, and the exhaust gas guided to the respective heat storage parts 42a, 42b is guided to the exhaust pipe 65; and the exhaust valves 66a, 66b provided in the exhaust pipe 65 are opened, so that the aforementioned exhaust gas is guided from the respective heat storage parts 42a, 42b to the exhaust tower 67 through the exhaust pipe 65 and discharged.

Furthermore, in the regenerative burner 40A on one side, the combustion operation is performed in the following manner: the air Air is supplied to the air supply pipe 62 by the air supply blower 61, and the supply valve 63a provided on one side of the air supply pipe 62 is opened to guide the air Air to the heat storage part 42a in the regenerative burner 40A, and the air Air is heated by the heated heat storage body 43a in the heat storage part 42a, and the heated air Air is ejected from the air supply/exhaust port 41a in the regenerative burner 40A into the furnace R2, and the fuel switching valve 52a provided on the fuel supply pipe 51a is opened to inject hydrogen H ₂ is supplied to the aforementioned fuel injection nozzle 50a, and hydrogen H ₂ is ejected from the injection port 53a at the front end of the fuel injection nozzle 50a into the furnace R1, thereby causing the hydrogen H ₂ to burn.

Here, in the regenerative burner 40A which performs a combustion operation of burning hydrogen _H2 by injecting the air Air heated by passing through the regenerative heat section 42a into the furnace R2 from the supply/exhaust port 41a, the exhaust valve 66a provided on one side of the exhaust pipe 65 for discharging the combustion exhaust gas from the regenerative heat section 42a after the hydrogen _H2 is burned in the furnace R2 is closed, and the on-off valve 55a provided on the inert gas supply pipe 54a is closed, so that the nitrogen _N2 of the inert gas is not supplied to the fuel injection nozzle 50a.

On the other hand, in the other regenerative burner 40B that does not perform the combustion operation, the fuel switching valve 52b provided in the fuel supply pipe 51b is closed, so that hydrogen _H2 is not supplied to the fuel injection nozzle 50b, and the supply valve 63b provided in the air supply pipe 62 is closed, so that the air Air is not introduced into the regenerative burner 40B. In this state, the exhaust valve 66b provided in the exhaust pipe 65 for exhausting the combustion exhaust gas from the regenerative burner 42b is opened, and the hydrogen H2 in the furnace R2 is sucked by the suction blower 64. The _combustion exhaust gas after being combusted is guided to the aforementioned heat storage section 42b through the supply/exhaust port 41b in the heat storage burner 40B, and the heat of the combustion exhaust gas is stored in the heat storage body 43b accommodated in the heat storage section 42b. After the heat storage action, the aforementioned combustion exhaust gas is guided to the exhaust tower 67 through the aforementioned exhaust pipe 65 to be exhausted.

Here, in the heat storage burner 40B on the other side of the heat storage action in which the combustion exhaust gas in the furnace _R2 is guided to the aforementioned heat storage section 42b and 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 in the aforementioned inert gas supply pipe 54b is opened, so that the nitrogen _N2 of the inert gas is supplied to the aforementioned fuel injection nozzle 50b in a small amount.

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 furnace R2 to be expelled, thereby preventing flashback.

In addition, the air Air in the furnace R2 can be prevented from flowing into the aforementioned fuel injection nozzle 50b, and in the other side's regenerative burner 40B, when hydrogen _H2 is supplied to the aforementioned fuel injection nozzle 50b to perform combustion, the hydrogen _H2 supplied to the fuel injection nozzle 50b and the air Air flowing into the fuel injection nozzle 50b can be prevented from mixing and causing an explosion in the fuel injection nozzle 50b.

Furthermore, by flowing nitrogen N ₂ at room temperature, excessive temperature rise in the small fuel injection nozzle 50b can be prevented, and deformation of the fuel injection nozzle 50b due to heat can be prevented.

Furthermore, in the regenerative combustion equipment of the second embodiment, since hydrogen _H2 is used as fuel, even if hydrogen _H2 is not completely burned and a part of hydrogen _H2 remains when switching between the combustion operation and the regenerative operation, there is no possibility of generating soot as in the conventional fossil fuels, thereby causing the treated material (not shown) to be polluted. Furthermore, since hydrogen _H2 has an extremely high combustibility, even if unburned hydrogen _H2 is generated, it will be quickly burned by the air Air injected into the furnace R2 from the aforementioned air supply/exhaust ports 41a, 41b after the switching.

Thus, in the regenerative hydrogen combustion device of the second embodiment, when the combustion operation and the regenerative heat operation are switched alternately in the pair of regenerative hydrogen burners 40A and 40B, the switching of the combustion operation and the regenerative heat operation is performed simultaneously, as shown in FIG. 5 , so that the hydrogen H can be switched by the fuel switching valves 52a and 52b. The timing of supplying and stopping the fuel injection nozzles _50a and 50b to the furnace R2 and the timing of switching the supply and stopping of the air Air from the respective air supply/exhaust ports 41a and 41b in the respective regenerative burners 40A and 40B to the furnace R2 by the aforementioned supply valves 63a and 63b provided in the air supply pipe 62 are synchronized. As a result, as shown in FIG. 5, the temperature in the furnace R2 is kept constant, and the processed object (not shown) can be processed at a stable temperature in the furnace R2.

In addition, in the regenerative hydrogen combustion equipment of this embodiment 2, as described above, although it is configured that the air Air in the furnace R2 flows into the fuel injection nozzles 50a and 50b that have stopped the combustion operation and performs the combustion operation, in order to prevent the hydrogen _H2 supplied to the fuel injection nozzles 50a and 50b from mixing with the air Air flowing into the fuel injection nozzles 50a and 50b and causing an explosion in the fuel injection nozzles 50a and 50b, the nitrogen _N2 of the inert gas is supplied from the inert gas supply pipes 54a and 54b to the fuel injection nozzles 50a and 50b that have stopped the combustion operation. However, it is not necessary to supply the nitrogen N2 of the inert gas to the fuel injection nozzles 50a and 50b. ₂ is supplied from the inert gas supply pipes 54a, 54b to the fuel injection nozzles 50a, 50b.

For example, as shown in FIG. 6 , fuel switching valves 52a, 52b for switching the supply and stop of hydrogen _H2 to the fuel injection nozzles 50a, 50b may be disposed near the injection ports 53a, 53b of the aforementioned fuel injection nozzles 50a, 50b, thereby reducing the volume of the air Air in the furnace R2 flowing into the fuel injection nozzles 50a, 50b whose combustion has been stopped.

In this way, the amount of air Air flowing from the furnace R2 into the fuel injection nozzles 50a and 50b becomes extremely small, and when the combustion operation is performed, the hydrogen _H2 supplied to the fuel injection nozzles 50a and 50b can be suppressed from exploding in the fuel injection nozzles 50a and 50b.

40A, 40B: Regenerative burner

41a,41b: air supply/exhaust port

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: Spray outlet

54a, 54b: Inert gas supply pipe

55a,55b: Open/Close valve

61: Air blower

62: Air supply pipe

63a,63b: Supply valve

64: Suction blower

65: Exhaust pipe

66a,66b: Exhaust valve

67: Exhaust tower

Air: Air

H ₂ : Hydrogen

_N2 : Nitrogen (inert gas)

R2: Furnace

Claims (5)

A heat storage type hydrogen combustion device is provided with supply/exhaust ports on both sides of a fuel injection nozzle for spraying hydrogen into a furnace. While spraying hydrogen into the furnace from the aforementioned fuel injection nozzle, combustion action is alternately performed and heat storage action is performed on the other hand. The combustion action is to spray air heated in a heat storage part containing a heat storage body into the furnace from the supply/exhaust port on one side, and to burn hydrogen sprayed into the furnace from the fuel injection nozzle; the heat storage action is to guide the combustion exhaust gas after the fuel is burned in the furnace to the heat storage part through the supply/exhaust port on the other side, and to store the heat of the combustion exhaust gas in the heat storage body contained in the heat storage part. The heat storage hydrogen combustion equipment as described in claim 1, wherein the air heated in the heat storage part containing the heat storage body is simultaneously switched to be ejected into the furnace from one air supply/exhaust port and guided to the heat storage part through the other air supply/exhaust port. A regenerative hydrogen combustion device is a regenerative burner having a fuel injection nozzle and a supply/exhaust port arranged in pairs. The fuel injection nozzle sprays hydrogen into a furnace; the supply/exhaust port sprays air heated in a heat storage part containing a heat storage body into the furnace and guides the exhaust gas after the fuel is burned in the furnace. In one regenerative burner, hydrogen is ejected from a fuel ejection nozzle into a furnace, and air heated by passing through a regenerative part containing a regenerative body is ejected from a supply/exhaust port into the furnace, and hydrogen and air are mixed and burned in the furnace. On the other hand, in the other regenerative burner, the action of spraying hydrogen from the fuel spray nozzle into the furnace is stopped, and the combustion exhaust gas after the fuel is burned in the furnace is guided to the heat storage part and the heat of the combustion exhaust gas is stored in the heat storage body accommodated in the heat storage part. The paired regenerative burners are alternately burned. Action and heat storage action, wherein a fuel switching valve is provided for switching the supply and stop of hydrogen to the aforementioned fuel injection nozzle, and an inert gas supply pipe is provided for supplying inert gas to the aforementioned fuel injection nozzle, and inert gas is supplied from the aforementioned inert gas supply pipe to the fuel injection nozzle where the supply of hydrogen is stopped by the aforementioned fuel switching valve. As described in claim 3, the heat storage hydrogen combustion equipment, wherein when switching the combustion action and the heat storage action in the pair of heat storage burners, the action of ejecting the air heated in the heat storage part containing the heat storage body from one supply/exhaust port into the furnace and the action of guiding the air to the heat storage part through the other supply/exhaust port are switched simultaneously. The regenerative hydrogen combustion device as described in claim 3 or 4, wherein the fuel switching valve for switching the supply and stop of hydrogen to the aforementioned fuel injection nozzle is arranged near the injection port in the aforementioned fuel injection nozzle.

Images