CN220750114U - Ammonia fuel hot-rolling heating furnace combustion system - Google Patents
Ammonia fuel hot-rolling heating furnace combustion system Download PDFInfo
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- CN220750114U CN220750114U CN202321587834.8U CN202321587834U CN220750114U CN 220750114 U CN220750114 U CN 220750114U CN 202321587834 U CN202321587834 U CN 202321587834U CN 220750114 U CN220750114 U CN 220750114U
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- heating furnace
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 341
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 141
- 239000000446 fuel Substances 0.000 title claims abstract description 88
- 238000010438 heat treatment Methods 0.000 title claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 39
- 238000005098 hot rolling Methods 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 46
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000005336 cracking Methods 0.000 claims abstract description 33
- 239000003546 flue gas Substances 0.000 claims abstract description 33
- 238000009826 distribution Methods 0.000 claims abstract description 26
- 238000002309 gasification Methods 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 238000003860 storage Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 35
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 13
- 239000001257 hydrogen Substances 0.000 description 13
- 229910052739 hydrogen Inorganic materials 0.000 description 13
- 239000002918 waste heat Substances 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 238000011217 control strategy Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
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- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The utility model relates to a combustion system of an ammonia fuel hot rolling heating furnace, and belongs to the field of energy conservation and emission reduction. The liquid ammonia storage tank is connected to the liquid ammonia gasification distribution device, and an outlet of the liquid ammonia gasification distribution device is connected to the ammonia fuel burner, the SNCR denitration device, the ammonia cracking device and the SCR denitration device respectively in four paths. The combustion-supporting fan is connected to the ammonia fuel burner. An ammonia fuel burner is arranged on the furnace body, and an SNCR denitration device is arranged at the tail end of the furnace body close to the furnace body. The tail end of the furnace body is sequentially connected with an ammonia cracking device, a liquid ammonia gasification distribution device, an SCR denitration device and a residual ammonia trapping device along the flow direction of the flue gas. The utility model can realize the safe and stable combustion of ammonia fuel and the discharge of ultralow nitrogen oxides under the full working condition of the hot-rolling heating furnace, and the final discharge of the combustion system is nitrogen, thereby realizing the zero carbon discharge of the heating furnace while meeting the heating process requirement of the hot-rolling heating furnace.
Description
Technical Field
The utility model belongs to the field of energy conservation and emission reduction, and relates to a combustion system of an ammonia fuel hot-rolling heating furnace.
Background
Under the background of double carbon, higher process requirements are put forward for the ferrous metallurgy industry. The existing hot-rolling heating furnace mainly uses carbon-containing fuel generated in the production flow of a steelworks, and the fuel of the hot-rolling heating furnace is necessarily changed in the future whether the technology is a short-flow arc furnace technology or a hydrogen metallurgy technology. It is urgent to find a "no-carbon fuel" to replace the original fuel of the hot-rolled heating furnace.
The ammonia combustion products are nitrogen and water, so that zero carbon emission can be realized. Compared with the high cost of hydrogen preparation, transportation and storage at the present stage, the preparation, transportation and storage cost of ammonia is low, the method has abundant application experience in other fields of industry and has the potential of large-scale application in a hot rolling heating furnace. However: ammonia is used as fuel, the flame propagation speed is low, the ignition range is narrow, unstable combustion phenomenon can occur at lower temperature, and potential safety hazards exist; meanwhile, ammonia contains nitrogen element, and as a nitrogenous fuel, a large amount of nitrogen oxides can be generated by combustion of the ammonia, so that the emission standard of government pollutants is not met.
Disclosure of Invention
Accordingly, the present utility model is directed to a combustion system of an ammonia-fueled hot-rolled heating furnace
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the combustion system of the ammonia fuel hot rolling heating furnace comprises a liquid ammonia storage tank, a combustion-supporting blower, a liquid ammonia gasification distribution device, an ammonia cracking device, a furnace body, an ammonia fuel burner, an SNCR denitration device, an SCR denitration device and a residual ammonia trapping device;
the liquid ammonia storage tank is connected to the liquid ammonia gasification distribution device, the outlet of the liquid ammonia gasification distribution device is divided into four paths, the three paths are respectively connected to the SNCR denitration device, the ammonia cracking device and the SCR denitration device, and the one path is connected to the ammonia fuel burner to form an ammonia fuel channel;
the combustion-supporting fan is connected with the ammonia fuel burner to form a combustion-supporting gas channel;
the ammonia fuel burner is arranged on the furnace body, and the SNCR denitration device is arranged at the tail end of the furnace body; the tail end of the furnace body passes through a flue along the flow direction of the flue gas, is connected with an ammonia cracking device or a short circuit bypass pipeline of the ammonia cracking device, then passes through a liquid ammonia gasification distribution device, an SCR denitration device and a residual ammonia trapping device, and is connected with a condensate water collecting device and a nitrogen collecting device to form a flue gas channel.
Optionally, the combustion-supporting gas is blown into the system through the combustion-supporting fan and is connected into the combustion-supporting gas inlet of the ammonia fuel burner.
Optionally, the combustion air, the oxygen-enriched air or the pure oxygen is controlled and regulated by a valve.
Optionally, the furnace body is divided into a heat recovery section without heat supply, a preheating section, a heating section and a soaking section, and ammonia fuel burners are installed on the preheating section, the heating section and the soaking section.
Optionally, the heat recovery section is not equipped with ammonia fuel burners or other heating equipment so that the SNCR denitration device operates at a suitable temperature.
Optionally, the device also comprises a condensed water collecting device and a nitrogen collecting device, and the residual ammonia collecting device is connected with the condensed water collecting device and the nitrogen collecting device.
Optionally, the device also comprises an ammonia preheater, the outlet of the liquid ammonia gasification distribution device is connected to the ammonia preheater, the SNCR denitration device, the ammonia cracking device and the SCR denitration device respectively in four paths, and the outlet of the ammonia preheater is connected to an ammonia fuel flame regulating burner and an ammonia fuel flat flame burner to form an ammonia fuel channel.
Optionally, the device further comprises a combustion-supporting gas preheater, wherein the combustion-supporting fan is connected to the combustion-supporting gas preheater, and the outlet of the combustion-supporting gas preheater is connected to the ammonia fuel flame regulating burner and the ammonia fuel flat flame burner to form a combustion-supporting gas channel.
The utility model has the beneficial effects that:
according to the system, the proportion of four parts of ammonia gas involved in direct combustion, cracking, SNCR and SCR in the system under different working conditions is regulated, so that the safe and stable combustion of ammonia fuel and the ultralow nitrogen oxide emission of the hot-rolling heating furnace under all working conditions are realized, the final emission of the combustion system is nitrogen, and the zero carbon emission of the heating furnace is realized while the heating process requirement of the hot-rolling heating furnace is met.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a system according to embodiment 1 of the present utility model;
FIG. 2 is a schematic diagram of an ammonia fuel burner;
FIG. 3 is a schematic diagram of another ammonia fuel burner configuration;
fig. 4 is a schematic diagram of a system in embodiment 2 of the present utility model.
Reference numerals: the device comprises a liquid ammonia storage tank 1, a combustion-supporting blower 2, a liquid ammonia gasification distribution device 3, an ammonia cracking device 4, a furnace body 5, an ammonia fuel burner 6, an ammonia fuel burner hydrogen fuel inlet 61, an ammonia fuel burner ammonia fuel inlet 62, an ammonia fuel burner combustion-supporting gas inlet 63, an SNCR denitration device 7, an SCR denitration device 8, a residual ammonia trapping device 9, a condensate water collecting device 10, a nitrogen collecting device 11, an ammonia preheater 12 and a combustion-supporting gas preheater 13.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
Referring to fig. 1 to 3, the utility model comprises a liquid ammonia storage tank 1, a combustion-supporting blower 2, a liquid ammonia gasification distribution device 3, an ammonia cracking device 4, a furnace body 5, an ammonia fuel burner 6, an SNCR denitration device 7, an SCR denitration device 8, a residual ammonia trapping device 9, a condensed water collecting device 10 and a nitrogen collecting device 11. The liquid ammonia storage tank 1 is connected to the liquid ammonia gasification distribution device 3, the outlet of the liquid ammonia gasification distribution device 3 is divided into four paths, three paths are respectively connected to the SNCR denitration device 7, the ammonia cracking device 4 and the SCR denitration device 8, and one path is connected to the ammonia fuel burner 6 to form an ammonia fuel channel. The combustion-supporting fan 2 is connected to the ammonia fuel burner 6 to form a combustion-supporting gas channel. An ammonia fuel burner 6 is arranged on the furnace body 5, an SNCR denitration device 7 is arranged at a position of the furnace body 5 close to the tail end smoke temperature of 850-1100 ℃, the tail end of the furnace body 5 is connected with an ammonia cracking device 4 or an ammonia cracking device short circuit bypass pipeline along the smoke flow direction through a flue, then flows through a liquid ammonia gasification distribution device 3, an SCR denitration device 8 and a residual ammonia trapping device 9, and the residual ammonia trapping device 9 is connected with a condensate water collecting device 10 and a nitrogen collecting device 11 to form a smoke channel. The liquid ammonia is stored in a liquid ammonia storage tank 1, flows through a liquid ammonia gasification and distribution device 3, absorbs waste heat or electric heat of flue gas of a heating furnace, and is converted into ammonia; the gasified ammonia gas is divided into four strands, wherein the first flow rate is a and is connected with an ammonia fuel inlet of an ammonia fuel burner 6, the second flow rate is b and is connected with an SNCR denitration device 7, the third flow rate is c, the third flow rate is connected with a hydrogen fuel inlet of the ammonia fuel burner 6 after absorbing waste heat of flue gas or converting electric heat into hydrogen and a small amount of nitrogen under the action of a catalyst through an ammonia pyrolysis device 4, and the fourth flow rate is d and is connected with an SCR denitration device 8; the flow of the four ammonia gas is controlled and regulated by a valve according to a combustion control strategy. Combustion-supporting gas is blown into the system through a fan 2; a combustion-supporting gas inlet connected with an ammonia fuel burner 6; the combustion-supporting gas can be air, oxygen-enriched air or pure oxygen, and the gas flow is controlled and regulated by a valve according to the gas composition and the corresponding combustion control strategy. After the flue gas in the furnace is sprayed into ammonia gas to reduce nitrogen oxides through the SNCR denitration device 7, the flue gas is discharged into a flue from a furnace body, flows through the ammonia cracking device 4 or a short-circuit bypass pipeline of the ammonia cracking device, and then flows through the liquid ammonia gasification distribution device 3, the SCR denitration device 8 and the residual ammonia trapping device 9; the water in the flue gas is collected and stored by the condensed water collecting device 10; only nitrogen remains in the flue gas after water removal to the nitrogen collection device 11 for recycling or direct discharge of the flue gas. The furnace body 5 is divided into a heat recovery section without heat supply, a preheating section, a heating section and a soaking section, wherein the preheating section, the heating section and the soaking section are provided with ammonia fuel burners, and the heat recovery section is not provided with the ammonia fuel burners or other heat supply equipment so that the SNCR denitration device works at a proper temperature. The ammonia fuel burner 6 has a hydrogen fuel inlet 61, an ammonia fuel inlet 62, and a combustion gas inlet 63, in this embodiment: a low-nitrogen oxide gas flame regulating burner disclosed in CN2379705Y is adopted, a central air pipe is utilized as a hydrogen fuel inlet 61, a gas pipe is utilized as an ammonia fuel inlet 62, and an air inlet pipe is utilized as a combustion-supporting gas inlet 63; and a dual swirl flat flame burner disclosed in CN106122946B, using its central air duct as hydrogen fuel inlet 61, its gas duct as ammonia fuel inlet 62, and its main air duct as combustion supporting gas inlet 63.
The working principle of this embodiment is as follows:
according to the system, the proportion of four parts of ammonia gas involved in direct combustion, cracking, SNCR and SCR in the system under different working conditions is regulated, so that the safe and stable combustion of ammonia fuel and the ultralow nitrogen oxide emission of the hot-rolling heating furnace under all working conditions are realized, the final emission of the combustion system is nitrogen, and the zero carbon emission of the heating furnace is realized while the heating process requirement of the hot-rolling heating furnace is met.
Starting the furnace until the furnace temperature is lower than 652℃: the furnace temperature is lower than the ignition point of ammonia, and the burner is required to provide open flame to stabilize the combustion of ammonia; at the moment, the temperature of the flue gas is lower than 800-900 ℃ required by the ammonia cracking device, at the moment, the ammonia cracking device is operated by using electric heat, and the inflowing 15-30% ammonia gas is cracked into hydrogen and a small amount of nitrogen gas which are connected to a burner to serve as long-term open flame fuel, so that stable combustion of the ammonia gas is ensured; at this time, the temperature of the flue gas is lower than 850-1100 ℃ required by the SNCR device, and a large amount of nitrogen oxides are generated by the combustion of the ammonia gas containing nitrogen elements, at this time, the ammonia gas supply of the SNCR device is closed, the SCR ammonia gas supply at the tail end of the flue is started, and the nitrogen oxides in the flue gas are treated by adopting selective catalytic denitration.
Furnace temperature is higher than 652 ℃ until furnace temperature reaches 950 ℃: the furnace temperature is higher than the ignition point of ammonia, so that stable combustion of ammonia can be realized without long-term open flame; at the moment, the temperature of the flue gas just reaches the active temperature range of the catalyst before the ammonia pyrolysis device, but the long-term open flame stable combustion of hydrogen fuel is not needed at the moment, and the ammonia supply of the ammonia catalytic device can be closed; at this time, the temperature of the flue gas is lower than 850-1100 ℃ required by the SNCR device, and a large amount of nitrogen oxides are generated by the combustion of the ammonia gas containing nitrogen elements, at this time, the ammonia gas supply of the SNCR device is closed, the SCR ammonia gas supply at the tail end of the flue is started, and the selective catalytic reduction method is adopted to treat the nitrogen oxides in the flue gas.
Furnace temperature is higher than 950 ℃ until the furnace temperature reaches 1400℃: the ammonia can be burnt stably; the flue gas temperature before the ammonia cracking device also reaches the catalyst activity temperature range, the more the ammonia cracking needs to absorb heat, the more the cracking proportion is, the more the flue gas waste heat is recycled, the more the flue gas temperature is, the more the ammonia fuel is saved, but more ammonia cracking catalyst is simultaneously lost, the catalyst use cost and the liquid ammonia cost need to be evaluated, and the ammonia cracking proportion is adjusted; and the temperature of the tail end of the furnace body reaches the reaction temperature suitable for SNCR, at the moment, the supply of SCR ammonia gas at the tail end of the flue is closed, and the selective non-catalytic reduction method is used for treating nitrogen oxides in the flue gas.
Example two
Referring to fig. 4, the utility model comprises a liquid ammonia storage tank 1, a combustion fan 2, a liquid ammonia gasification distribution device 3, an ammonia cracking device 4, a furnace body 5, an ammonia fuel burner 6, an ammonia fuel burner hydrogen fuel inlet 61, an ammonia fuel burner ammonia fuel inlet 62, an ammonia fuel burner combustion-supporting gas inlet 63, an SNCR denitration device 7, an SCR denitration device 8, a residual ammonia trapping device 9, a condensed water collecting device 10, a nitrogen collecting device 11, an ammonia preheater 12 and a combustion-supporting gas preheater 13.
The liquid ammonia storage tank 1 is connected to the liquid ammonia gasification distribution device 3, the outlet of the liquid ammonia gasification distribution device 3 is connected to the ammonia preheater 12, the SNCR denitration device 7, the ammonia cracking device 4 and the SCR denitration device 8 respectively in four paths, and the outlet of the ammonia preheater 12 is connected to the ammonia fuel burner 6 to form an ammonia fuel channel. The combustion-supporting fan 2 is connected to the combustion-supporting gas preheater 13, and the outlet of the combustion-supporting gas preheater 13 is connected to the burner 6 to form a combustion-supporting gas channel. The furnace body 5 is provided with a burner 6, the tail end of the furnace body 5 is provided with an SNCR denitration device 7 near the tail end, the tail end of the furnace body 5 is sequentially connected with an ammonia cracking device 4, a combustion-supporting gas preheater 13, an ammonia preheater 12, a liquid ammonia gasification distribution device 3, an SCR denitration device 8 and a residual ammonia trapping device 9 along the flow direction of flue gas, and the residual ammonia trapping device 9 is connected with a condensate water collecting device 10 and a nitrogen collecting device 11 to form a flue gas channel. The liquid ammonia is stored in a liquid ammonia storage tank 1, flows through a liquid ammonia gasification and distribution device 3, absorbs waste heat or electric heat of flue gas of a heating furnace, and is converted into ammonia; the gasified ammonia gas is divided into four flows, wherein the first flow rate is a, the flow rate passes through an ammonia preheater 12 to absorb the waste heat of the flue gas and then is connected to an ammonia fuel inlet of an ammonia fuel burner 6, the second flow rate is b, the flow rate is connected to an SNCR denitration device 7, the third flow rate is c, the flow rate is connected to a hydrogen fuel inlet of the ammonia fuel burner 6 after the waste heat of the flue gas is absorbed by an ammonia cracking device 4 or the electric heat is converted into hydrogen and a small amount of nitrogen under the action of a catalyst, and the fourth flow rate is d, the flow rate is connected to an SCR denitration device 8; the flow of the four ammonia gas is controlled and regulated by a valve according to a combustion control strategy. Combustion-supporting gas is blown into the system through a fan 2; the waste heat of the flue gas is absorbed by the combustion-supporting gas preheater 13 and then is connected to a combustion-supporting gas inlet of the ammonia fuel burner 6; the combustion-supporting gas can be air, oxygen-enriched air or pure oxygen, and the gas flow is controlled and regulated by a valve according to the gas composition and the corresponding combustion control strategy. After the flue gas in the furnace is sprayed with ammonia gas to reduce nitrogen oxides through the SCR denitration device 8, the flue gas is discharged into a flue from a furnace body and sequentially flows through the ammonia cracking device 4, the combustion-supporting gas preheater 13, the ammonia gas preheater 12, the liquid ammonia gasification distribution device 3, the SCR denitration device 8 and the residual ammonia trapping device 9; the water in the flue gas is collected and stored by the condensed water collecting device 10 for other purposes or direct discharge; only nitrogen remains in the flue gas after water removal to the nitrogen collection device 11 for recycling or direct discharge of the flue gas.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.
Claims (8)
1. A combustion system of an ammonia fuel hot rolling heating furnace is characterized in that,
the device comprises a liquid ammonia storage tank (1), a combustion-supporting fan (2), a liquid ammonia gasification distribution device (3), an ammonia cracking device (4), a furnace body (5), an ammonia fuel burner (6), an SNCR denitration device (7), an SCR denitration device (8) and a residual ammonia trapping device (9);
the liquid ammonia storage tank (1) is connected to the liquid ammonia gasification distribution device (3), the outlet of the liquid ammonia gasification distribution device (3) is divided into four paths, three paths are respectively connected to the SNCR denitration device (7), the ammonia cracking device (4) and the SCR denitration device (8), and one path is connected to the ammonia fuel burner (6) to form an ammonia fuel channel;
the combustion-supporting fan (2) is connected to the ammonia fuel burner (6) to form a combustion-supporting gas channel;
the ammonia fuel burner (6) is arranged on the furnace body (5), and the SNCR denitration device (7) is assembled at the tail end of the furnace body (5); the tail end of the furnace body (5) passes through a flue along the flow direction of flue gas, is connected with an ammonia cracking device (4) or a short circuit bypass pipeline of the ammonia cracking device (4), and then passes through a liquid ammonia gasification distribution device (3), an SCR denitration device (8) and a residual ammonia trapping device (9), and is connected with a condensate water collecting device (10) and a nitrogen collecting device (11) after the residual ammonia trapping device (9) to form a flue gas channel.
2. The combustion system of the ammonia-fuel hot-rolled heating furnace according to claim 1, wherein combustion-supporting gas is blown into the combustion-supporting gas inlet of the ammonia-fuel burner (6) through the combustion-supporting fan (2) blowing system.
3. The combustion system of an ammonia-fueled hot rolled heating furnace according to claim 1, wherein the combustion supporting gas air, oxygen-enriched air or pure oxygen is regulated by valve control.
4. The combustion system of the ammonia-fuel hot-rolling heating furnace according to claim 1, wherein the furnace body is divided into a heat recovery section, a preheating section, a heating section and a soaking section which are not supplied with heat, and ammonia-fuel burners (6) are installed in the preheating section, the heating section and the soaking section.
5. The combustion system of an ammonia-fueled hot rolled heating furnace according to claim 4, wherein the heat recovery section is not equipped with heating equipment so that the SNCR denitration device (7) operates at a suitable temperature.
6. The combustion system of the ammonia fuel hot rolling heating furnace according to claim 1, further comprising a condensed water collecting device (10) and a nitrogen collecting device (11), wherein the condensed water collecting device (10) and the nitrogen collecting device (11) are connected behind the residual ammonia collecting device (9).
7. The combustion system of the ammonia-fuel hot-rolling heating furnace according to claim 1, further comprising an ammonia preheater, wherein the outlet of the liquid ammonia gasification distribution device is respectively connected to the ammonia preheater, the SNCR denitration device, the ammonia cracking device and the SCR denitration device in four paths, and the outlet of the ammonia preheater is connected to an ammonia-fuel flame regulating burner and an ammonia-fuel flat flame burner to form an ammonia fuel channel.
8. The combustion system of an ammonia-fueled hot rolled heating furnace according to claim 1, further comprising a combustion-supporting gas preheater, the combustion-supporting blower being connected to the combustion-supporting gas preheater, the combustion-supporting gas preheater outlet being connected to the ammonia-fueled flame regulating burner, the ammonia-fueled flat flame burner, forming a combustion-supporting gas channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321587834.8U CN220750114U (en) | 2023-06-20 | 2023-06-20 | Ammonia fuel hot-rolling heating furnace combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321587834.8U CN220750114U (en) | 2023-06-20 | 2023-06-20 | Ammonia fuel hot-rolling heating furnace combustion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220750114U true CN220750114U (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321587834.8U Active CN220750114U (en) | 2023-06-20 | 2023-06-20 | Ammonia fuel hot-rolling heating furnace combustion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220750114U (en) |
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- 2023-06-20 CN CN202321587834.8U patent/CN220750114U/en active Active
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