CN217763522U - Natural gas ammonia-doped combustion system for coupling green hydrogen to produce ammonia - Google Patents
Natural gas ammonia-doped combustion system for coupling green hydrogen to produce ammonia Download PDFInfo
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- CN217763522U CN217763522U CN202221930465.3U CN202221930465U CN217763522U CN 217763522 U CN217763522 U CN 217763522U CN 202221930465 U CN202221930465 U CN 202221930465U CN 217763522 U CN217763522 U CN 217763522U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The utility model discloses a natural gas ammonia-mixing combustion system for coupling green hydrogen to prepare ammonia, wherein a boiler burner is arranged as a natural gas ammonia burner, the natural gas ammonia burner is connected with a gas mixing tank and an air pipeline, and gas and air inlets are respectively provided with a flow regulating valve; 1. the secondary energy saver is connected in series and arranged behind a flue at the tail part of the boiler, and the flue gas online analyzer is arranged in the flue behind the secondary energy saver; the outlet of the PSA carbon-nitrogen separation device is respectively connected with a nitrogen buffer tank and a carbon dioxide buffer tank; the inlet of the ammonia synthesis device is respectively connected with the outlets of the nitrogen buffer tank and the hydrogen buffer tank through flow regulating valves, and the outlet is connected with the ammonia buffer tank; the water inlet of the water electrolysis hydrogen production tank is connected with the desalting water tank through a water pump, and the outlet of the water electrolysis hydrogen production tank is respectively connected with the hydrogen buffer tank and the oxygen buffer tank. The utility model discloses can carry out the maximum comprehensive recycle and the zero carbon emission of water conservation to the heat matter of flue gas when realizing that the natural gas mixes ammonia oxygen boosting and falls the burning of carbon low nitrogen.
Description
Technical Field
The utility model belongs to the technical field of the clean electricity generation of gaseous fuel low carbon low nitrogen, concretely relates to ammonia combustion system is mixed to natural gas of green hydrogen system ammonia of coupling.
Background
Under the background of carbon peak carbon neutralization, a gas-fired boiler mainly burning natural gas also faces great energy-saving and carbon-reduction challenges, and the current mainstream carbon neutralization technical route can adopt zero-carbon fuel part to replace carbon-containing fuel to reduce the whole carbon emission level besides carbon dioxide capture, utilization and storage (CCUS). On the other hand, with the rapid increase of installed capacity of renewable energy sources year by year and the undeveloped large-scale energy storage, the green electricity abandon rate is high, and how to effectively utilize the abandoned electricity is an urgent problem to be solved.
Hydrogen is divided into ash hydrogen, blue hydrogen and green hydrogen, the ash hydrogen produced by global fossil energy currently accounts for more than 95%, but the green hydrogen produced by electrolyzing water by using renewable energy is vigorously developed. Compared with hydrogen, ammonia is an effective carrier of hydrogen energy, the preparation process is mature, the storage and transportation cost is low, the safety is high, zero carbon emission can be realized in the whole life cycle, and the fuel is paid much attention as 'zero carbon' fuel. The PSA carbon-nitrogen separation device can realize the nitrogen preparation and carbon dioxide capture synchronously by the flue gas pressure swing adsorption process. The existing research situation is integrated, and the problems of small ammonia doping proportion, high nitrogen oxide emission, insufficient overall heat efficiency and the like of the existing ammonia-doped combustion of the gas-fired boiler are solved. Therefore, how to realize the maximum carbon reduction and low nitrogen emission of the gas boiler and simultaneously carry out comprehensive recycling of heat and mass has profound significance for developing green recycling economy in petrochemical industry parks, coal industry parks, iron and steel, metallurgy and other industries.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of above-mentioned prior art, the utility model aims to provide a natural gas of green hydrogen system ammonia of coupling mixes ammonia combustion system, the utility model discloses can carry out the maximum comprehensive recycle and the zero carbon emission of water conservation to the heat matter of flue gas when realizing that the natural gas mixes the ammonia oxygen boosting and falls the burning of carbon low nitrogen, realize the step utilization of energy and the organic circulation of material.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a natural gas ammonia-doped combustion system for coupling green hydrogen to prepare ammonia comprises a boiler, an economizer group formed by connecting a plurality of economizers in series, a PSA carbon-nitrogen separation device, an ammonia synthesis device, a water electrolysis hydrogen production tank, a gas mixing tank and an oxygen buffer tank, wherein the boiler is a natural gas ammonia burner, the economizer group is arranged at the tail end of a flue at the tail part of the boiler, a flue gas outlet of the economizer at the last stage in the economizer group is connected with an inlet of the PSA carbon-nitrogen separation device, a nitrogen gas outlet of the PSA carbon-nitrogen separation device is connected with a nitrogen gas inlet of the ammonia synthesis device, a hydrogen gas outlet of the water electrolysis hydrogen production tank is connected with a hydrogen gas inlet of the ammonia synthesis device, an oxygen gas outlet of the water electrolysis tank is connected with an inlet of the oxygen buffer tank, an outlet of the oxygen buffer tank is connected with a combustion-supporting air channel of the natural gas ammonia burner after being connected with an air source, an ammonia outlet of the ammonia synthesis device is connected with an ammonia inlet of the gas mixing tank, an ammonia gas inlet of the gas mixing tank is also arranged on the gas mixing tank, and a mixed gas outlet of the gas mixing tank is connected with a fuel gas channel of the natural gas burner;
the hydrogen inlet of the ammonia synthesis device, the nitrogen inlet of the ammonia synthesis device, the ammonia inlet of the gas mixing tank, the natural gas inlet of the gas mixing tank, the mixed gas outlet of the gas mixing tank, the outlet of the oxygen buffer tank and the inlet of the combustion-supporting air channel of the natural gas ammonia burner are all provided with flow regulating valves;
the water electrolysis hydrogen production tank is electrically connected with the green.
Preferably, the economizer group comprises a primary economizer and a secondary economizer which are sequentially connected in series, and a flue gas outlet of the secondary economizer is connected with an inlet of the PSA carbon-nitrogen separation device.
Preferably, the natural gas ammonia-doped combustion system for producing ammonia by coupling green hydrogen also comprises a desalting water tank; the temperature of the flue gas can be reduced to be below a water dew point after passing through the secondary economizer, a water outlet is formed in the secondary economizer, the water outlet of the secondary economizer is connected with a demineralized water tank, the demineralized water tank is also connected with a cold end inlet of the secondary economizer, a cold end outlet of the secondary economizer is connected with a cold end inlet of the primary economizer, and a cold end outlet of the primary economizer is connected with a steam-water system inlet of a boiler; and water pumps are arranged on a pipeline for connecting the water outlet of the secondary energy saver with the demineralized water tank, a pipeline for connecting the demineralized water tank with the cold end inlet of the secondary energy saver, a pipeline for connecting the cold end outlet of the secondary energy saver with the cold end inlet of the primary energy saver and a pipeline for connecting the cold end outlet of the primary energy saver with the steam-water system inlet of the boiler, and a flow regulating valve is arranged at a water pump outlet on a pipeline for connecting the demineralized water tank with the cold end inlet of the secondary energy saver.
Preferably, the demineralized water tank is connected with the water electrolysis hydrogen production tank, a water pump is arranged on a pipeline connecting the demineralized water tank with the water electrolysis hydrogen production tank, and a flow regulating valve is arranged at an outlet of the water pump.
Preferably, the utility model discloses the green hydrogen ammonia production's of coupling natural gas mixes ammonia combustion system still includes flue gas on-line analyzer, and flue gas on-line analyzer's survey hole is arranged on the pipeline of the exhanst gas outlet of second grade energy-saving appliance and PSA carbon nitrogen separator entry linkage.
Preferably, a nitrogen buffer tank is arranged on a pipeline connecting a nitrogen outlet of the PSA carbon-nitrogen separation device and a nitrogen inlet of the ammonia synthesis device, and a flow regulating valve is arranged at an outlet of the nitrogen buffer tank.
Preferably, an ammonia buffer tank is arranged on a pipeline connecting an ammonia outlet of the ammonia synthesis device and an ammonia inlet of the gas mixing tank, and a flow regulating valve is arranged at an outlet of the ammonia buffer tank.
Preferably, the utility model discloses the green hydrogen system ammonia's of coupling natural gas mixes ammonia combustion system still includes flue gas temperature on-line monitoring appearance, and flue gas temperature on-line monitoring appearance's measurement station is arranged in the furnace export smoke chamber that changes of boiler.
Preferably, a carbon dioxide buffer tank (20) is connected to a nitrogen outlet of the PSA carbon-nitrogen separation device (4).
The utility model discloses following beneficial effect has:
the utility model discloses green hydrogen system ammonia's of coupling natural gas mixes ammonia combustion system carries out heat recovery and utilizes when realizing the oxygen-enriched combustion of the big proportion of the mixed burning ammonia gas on gas boiler through supporting construction energy-saving appliance group, PSA carbon nitrogen separator, water electrolysis hydrogen manufacturing cell system green hydrogen system oxygen and ammonia synthesizer that are formed by a plurality of energy-saving appliances establishing ties, realizes whole water conservation zero carbon emission; the utility model can dynamically adjust the proportion of the ammonia doped in the natural gas and the oxygen content of the combustion-supporting air by monitoring the temperature of the flue gas at the outlet of the boiler furnace and the components of the flue gas at the tail part, thereby realizing the stable, high-efficiency and low-nitrogen combustion of the mixed gas in the boiler; the smoke temperature can be reduced to 40-50 ℃ by an energy saver group formed by connecting a plurality of energy savers in series; carbon dioxide and nitrogen in the flue gas are completely purified and recovered by a PSA carbon-nitrogen separation system, hydrogen and nitrogen are further synthesized into ammonia gas in an ammonia synthesis device and are doped into natural gas by hydrogen and nitrogen electrolysis hydrogen production oxygen production by utilizing green electricity, and oxygen generated by electrolysis is used as a combustion improver and is mixed into air. To sum up, the utility model discloses when realizing that the natural gas mixes the ammonia oxygen boosting and falls the burning of carbon low nitrogen, carry out maximum comprehensive recycle and the zero carbon emission of water conservation to the heat matter of flue gas, realize the cascade of energy utilization and the organic circulation of material, have profound meaning to the green recycling economy of high carbon industry development such as petrochemical garden, coal industry garden and steel, metallurgy.
Furthermore, the boiler can be heated by the desalting water tank and the economizer group, and all condensed water in the flue gas can be recovered.
Drawings
Fig. 1 is a schematic diagram of the ammonia-doped natural gas combustion system for producing ammonia by coupling green hydrogen of the utility model.
Wherein, 1 is natural gas ammonia gas combustor, 2 is the one-level energy-saving appliance, 3 is the second grade energy-saving appliance, 4 is PSA carbon nitrogen separator, 5 is the ammonia synthesizer, 6 is water electrolysis hydrogen manufacturing groove, 7 is the gas blending tank, 8 is the boiler, 9 is the oxygen buffer tank, 10 is the ammonia buffer tank, 11 is the nitrogen buffer tank, 12 is the hydrogen buffer tank, 13 is the online analyzer of flue gas, 14 is the demineralized water case, 15 is flow control valve, 16 is the water pump, 17 is green electricity, 18 is flue gas temperature on-line monitoring appearance, 19 is power generation facility, 20 is the carbon dioxide buffer tank.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described in the figures are only exemplary and are intended to illustrate the invention, but not to be construed as limiting the invention.
In order to improve the combustion stability in the large-proportion natural gas ammonia-doped furnace and realize the water saving and zero carbon emission of the system, the utility model provides a natural gas ammonia-doped combustion system for preparing ammonia by coupling green hydrogen, the system is a gas boiler comprehensive system for large-proportion dynamic blending combustion of ammonia gas, oxygen-enriched combustion and heat recovery, and referring to figure 1, the utility model discloses a natural gas ammonia-doped combustion system for coupling green hydrogen to ammonia comprises a boiler 8, a natural gas ammonia burner 1, a primary energy saver 2, a secondary energy saver 3, a PSA carbon-nitrogen separation device 4, an ammonia synthesis device 5, a water electrolysis hydrogen production tank 6, a gas mixing tank 7, an oxygen buffer tank 9, a flue gas temperature online monitor 18 and a flue gas online analyzer 13, the burner of the boiler 8 is set as the natural gas ammonia burner 1, an energy saver group is arranged at the tail end of a flue at the tail part of the boiler, the energy saver group comprises the primary energy saver 2 and the secondary energy saver 3 which are connected in series in sequence, the temperature of the flue gas can be reduced to below a water dew point after passing through the secondary energy saver 3, the flue gas outlet of the secondary energy saver 3 is connected with the inlet of a PSA carbon-nitrogen separation device 4, the nitrogen outlet of the PSA carbon-nitrogen separation device 4 is connected with the nitrogen inlet of an ammonia synthesizer 5, the carbon dioxide outlet of the PSA carbon-nitrogen separation device 4 is connected with a carbon dioxide buffer tank 20, the hydrogen outlet of a water electrolysis hydrogen production tank 6 is connected with the hydrogen inlet of the ammonia synthesizer 5, the oxygen outlet of the water electrolysis hydrogen production tank 6 is connected with the inlet of an oxygen buffer tank 9, the outlet of the oxygen buffer tank 9 is connected with an air source and then is connected with a combustion-supporting air channel of a natural gas ammonia burner 1, the ammonia outlet of the ammonia synthesizer 5 is connected with the ammonia inlet of a gas mixing tank 7, the gas mixing tank 7 is also provided with a natural gas inlet, and the mixed gas outlet of the gas mixing tank 7 is connected with a fuel gas channel of the natural gas burner 1; a water outlet is arranged on the secondary economizer 3, the water outlet of the secondary economizer 3 is connected with a demineralized water tank 14, the demineralized water tank 14 is also connected with a cold end inlet of the secondary economizer 3, a cold end outlet of the secondary economizer 3 is connected with a cold end inlet of the primary economizer 2, and a cold end outlet of the primary economizer 2 is connected with a steam-water system inlet of the boiler 8; a water pump is arranged on a pipeline connecting a water outlet of the secondary energy saver 3 with the demineralized water tank 14, a pipeline connecting the demineralized water tank 14 with a cold end inlet of the secondary energy saver 3, a pipeline connecting a cold end outlet of the secondary energy saver 3 with a cold end inlet of the primary energy saver 2, and a pipeline connecting a cold end outlet of the primary energy saver 2 with a steam-water system inlet of the boiler 8, and a flow regulating valve is arranged at a water pump outlet on a pipeline connecting the demineralized water tank 14 with the cold end inlet of the secondary energy saver 3; the demineralized water tank 14 is connected with the water electrolysis hydrogen production tank 6, a water pump is arranged on a pipeline connecting the demineralized water tank 14 with the water electrolysis hydrogen production tank 6, and a flow regulating valve is arranged at the outlet of the water pump; a measuring hole of the flue gas online analyzer 13 is arranged on a pipeline connecting a flue gas outlet of the secondary economizer 3 and an inlet of the PSA carbon-nitrogen separation device 4; the measuring point of the flue gas temperature on-line monitor 18 is arranged at a hearth outlet smoke transfer chamber of the boiler 8; a nitrogen buffer tank 11 is arranged on a pipeline connecting a nitrogen outlet of the PSA carbon-nitrogen separation device 4 and a nitrogen inlet of the ammonia synthesis device 5; an ammonia buffer tank 10 is arranged on a pipeline connecting an ammonia outlet of the ammonia synthesizer 5 and an ammonia inlet of the gas mixing tank 7; a hydrogen inlet of the ammonia synthesis device 5, a nitrogen inlet of the ammonia synthesis device 5, an ammonia inlet of the gas mixing tank 7, a natural gas inlet of the gas mixing tank 7, a mixed gas outlet of the gas mixing tank 7, an outlet of the oxygen buffer tank 9 and an inlet of a combustion-supporting air channel of the natural gas ammonia burner 1 are respectively provided with a flow regulating valve 15; the water electrolysis hydrogen production tank 6 is connected with a green battery 17.
The utility model discloses green hydrogen ammonia production's of coupling natural gas mixes ammonia combustion system at the during operation, boiler afterbody flue gas flows through one-level energy-saving appliance 2 and second grade energy-saving appliance 3 in proper order, and step by step heat transfer reduces to the gas temperature behind the water dew point, and whole PSA carbon nitrogen separator 4 that get into, the water condensation in the flue gas is back from the whole recycle in outlet of second grade energy-saving appliance 3, converges into demineralized water tank 14 after the water treatment. The low-temperature demineralized water from the demineralized water tank 14 sequentially flows through the secondary economizer 3 and the primary economizer 2 through the water pump 16 and the flow regulating valve 15, exchanges heat with the flue gas, enters a steam-water system of the boiler 8, absorbs heat in the heating surface of the boiler 8 to be changed into steam, and enters the power generation device 19 to generate power. The PSA carbon nitrogen separation device 4 adopts two-stage pressure swing adsorption, separates and purifies carbon dioxide and nitrogen components in the flue gas, and respectively converges into the nitrogen buffer tank 11 and the carbon dioxide buffer tank 20 to realize carbon dioxide capture. The natural gas from a natural gas pipe network and the ammonia gas from the ammonia buffer tank 10 respectively enter a gas mixing tank 7, the mixing proportion is regulated by respective flow regulating valves 15, and the mixed fuel gas enters a fuel gas channel of a natural gas ammonia gas burner 1 and then enters a boiler hearth for combustion; oxygen from the oxygen buffer tank 9 is adjusted in flow rate through the flow adjusting valve 15 and mixed with air, and the mixed combustion-supporting air is adjusted in flow rate through the flow adjusting valve 15, enters a combustion-supporting air channel of the natural gas ammonia burner 1 and then enters a boiler hearth to participate in combustion. A measuring point of the online flue gas temperature monitor 18 is arranged at a flue gas transferring chamber at the outlet of the boiler furnace to monitor the flue gas temperature in real time; and a measuring hole of the flue gas on-line analyzer 13 is arranged in a flue behind the secondary energy saver 3 and in front of the PSA carbon-nitrogen separation device 4, so that the concentration of components such as nitrogen oxides, carbon dioxide and the like in the flue gas is monitored in real time.
Specifically, the utility model discloses a natural gas ammonia gas combustor 1 is in the excess air coefficient scope for 1.05 ~ 1.10, the oxygen content scope is 21% ~ 30% in the combustion-supporting wind and when boiler furnace export flue gas temperature is 800 ~ 1000 ℃, can realize 0 ~ 80% ammonia mixing proportion, and afterbodyThe concentration of nitrogen oxides in the smoke is not higher than 30mg/Nm 3 。
Specifically, the utility model discloses the natural gas of green hydrogen system ammonia of coupling mixes ammonia combustion system is when operation, controls natural gas ammonia gas combustor 1 earlier and only puts in the natural gas and carry out the load-lifting and the furnace intensification when the natural gas boiler cold starting, and other equipment begin to operate in step, after the boiler load reaches more than 20% and the furnace temperature rises to more than 650 ℃, begin to improve the oxygen content in ammonia blending proportion and the combustion-supporting wind step by step, finally realize the natural gas and mix ammonia oxygen boosting steady combustion; when the natural gas boiler is started in a hot state, the mixed gas with a low proportion (10 percent) can be directly put into operation; in the operation stage of the boiler, steam enters a power generation device 19 for power generation, the flue gas is cooled and condensed in the second stage, all condensed water is treated by water and then is converged into a desalting water tank 14, a PSA carbon-nitrogen separation device 4 carries out pressure swing adsorption on nitrogen and carbon dioxide in all low-temperature flue gas, the generated high-purity carbon dioxide is sent into a carbon dioxide buffer tank 20 for carbon dioxide capture, and the generated high-purity nitrogen is sent into a nitrogen buffer tank 11; meanwhile, the water electrolysis hydrogen production tank 6 utilizes green electricity 17 to electrolyze desalted water into hydrogen which is converged into the hydrogen buffer tank 11, and oxygen is converged into the oxygen buffer tank 9; meanwhile, the ammonia synthesizer 5 utilizes hydrogen and nitrogen to catalyze and synthesize ammonia gas under the conditions of high temperature and high pressure and then the ammonia gas is converged into the ammonia buffer tank 10; in the process of changing the load of the boiler or in the process of improving the ammonia mixing proportion of the fuel gas, the flow regulating valve 15 is controlled to regulate the ammonia mixing proportion in the gas mixing tank 7 according to the data such as the concentration and the oxygen content of the nitrogen oxides in the fuel gas fed back by the online flue gas analyzer 13 in real time, the flow regulating valve 15 is controlled to regulate the oxygen content in the combustion-supporting air, and the concentration of the nitrogen oxides in the flue gas meets the requirement of ultralow emission. The water electrolysis hydrogen production tank 6 utilizes green electricity 17 to carry out electrolysis hydrogen production, the required demineralized water is provided by a demineralized water tank 14, the amount of electrolyzed water is controlled by a flow regulating valve 15, hydrogen generated by electrolysis enters a hydrogen buffer tank 12, and oxygen generated by electrolysis enters an oxygen buffer tank 9.
Taking a 50T/H SZS50-1.3/310-Q natural gas steam boiler as an example, the water supply temperature is 25 ℃, the efficiency of the boiler is designed to be not less than 92 percent, and under the condition of keeping the full load output of the boiler, 8 percent of natural gas is mixed and burnt under the conditions of 1.05 excess air factor and 30 percent of oxygen content0% ammonia gas, the required ammonia gas flow rate is approximately 6200Nm 3 The required electrolysis water flow is 9323kg/h (80% of alkaline electrolysis efficiency), and the oxygen flow in the air is approximately 928Nm 3 And/h, the flow of the co-recoverable condensed water in the flue gas is 9973kg/h, and the water supplement is reduced by 650kg/h. When the operation hours per year is 2500h, renewable energy can be consumed for generating 0.93 hundred million degrees of green electricity per year, 930 ten thousand standard prescriptions can be supplied with oxygen per year, 1494 ten thousand standard prescriptions can be supplied with nitrogen per year, and 7620 tons of carbon dioxide can be collected per year. Can reduce 12743 tons of carbon dioxide emission in the year of not mixing ammonia, and has remarkable social and environmental protection benefits.
The utility model discloses a coupling flue gas heat recovery system, PSA carbon nitrogen piece-rate system, water electrolysis system oxyhydrogen system and ammonia synthesis system, in the ammonia that will make mixes the gas boiler, combine 18 on-line monitoring appearance of flue gas temperature and the online analyzer 13 real-time dynamic feedbacks of flue gas, reach high load regulation nature, furnace and fuel adaptability to control nitrogen oxide emission concentration when realizing zero carbon operation and not exceeding standard. When the concrete implementation, the utility model discloses a gas boiler provides the transformation technical route of zero carbon water conservation, improves boiler efficiency on a large scale consuming renewable energy rated time simultaneously, reduces the operation fuel cost. Green hydrogen system ammonia's of coupling natural gas mix ammonia combustion system has realized the interior burning operating mode of stove and has stabilized and the low dynamic matching who discharges of nitrogen oxide under the ammonia mixing proportion of difference, carry out the zero carbon emission of maximum comprehensive recycle and water conservation to the heat matter of flue gas simultaneously, realize that the step of energy utilizes and the organic circulation of material.
The natural gas ammonia-doped combustion system for preparing ammonia by coupling green hydrogen realizes the large-proportion ammonia gas oxygen-enriched combustion and the heat recovery and utilization on a gas boiler by constructing a flue gas deep heat recovery system, a PSA carbon-nitrogen separation system, a water electrolysis green hydrogen preparation oxygen generation system and an ammonia synthesis system in a matching way, and realizes the integral water-saving zero-carbon emission; the ammonia doping proportion of natural gas and the oxygen content of combustion-supporting air are dynamically adjusted by monitoring the temperature of the smoke at the outlet of the hearth and the components of the tail smoke, so that the stable and efficient low-nitrogen combustion of the mixed gas in the furnace is realized; the temperature of the flue gas is reduced to 40-50 ℃ while the boiler feed water is heated by a two-stage energy saver, and all condensed water in the flue gas is recovered; carbon dioxide and nitrogen in the flue gas are completely purified and recovered by a PSA carbon-nitrogen separation system, hydrogen and oxygen are produced by electrolyzing water by utilizing green electricity, the hydrogen and the nitrogen are further synthesized into ammonia gas in an ammonia synthesis subsystem and are doped into natural gas, and oxygen generated by electrolysis is used as a combustion improver and is mixed into air. To sum up, the utility model discloses when realizing that the natural gas mixes ammonia oxygen boosting and falls the burning of carbon low nitrogen, carry out the zero carbon emission of maximum comprehensive recycle and water conservation to the heat matter of flue gas, realize the step of energy and utilize and the organic circulation of material, have profound meaning to the green recycling economy of high carbon industry development such as petrochemical garden, coal industry garden and steel, metallurgy.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The natural gas ammonia-doped combustion system is characterized by comprising a boiler (8), an economizer group formed by connecting a plurality of economizers in series, a PSA carbon-nitrogen separation device (4), an ammonia synthesis device (5), a water electrolysis hydrogen production tank (6), a gas mixing tank (7) and an oxygen buffer tank (9), wherein the burner of the boiler (8) is set as a natural gas ammonia burner (1), the economizer group is arranged at the tail end of a flue of the boiler, a flue gas outlet of the last economizer in the economizer group is connected with an inlet of the PSA carbon-nitrogen separation device (4), a nitrogen outlet of the PSA carbon-nitrogen separation device (4) is connected with a nitrogen inlet of the ammonia synthesis device (5), a hydrogen outlet of the water electrolysis hydrogen production tank (6) is connected with a hydrogen inlet of the ammonia synthesis device (5), an oxygen outlet of the water electrolysis hydrogen production tank (6) is connected with an inlet of the oxygen buffer tank (9), an outlet of the oxygen mixing tank (9) is connected with a combustion-supporting air channel of the natural gas ammonia burner (1) after being connected with the hydrogen outlet of the ammonia synthesis device (5), an ammonia outlet of the water electrolysis hydrogen production device (5) is connected with an ammonia mixing tank (7), and an ammonia mixing tank (7) is also provided with a gas mixing tank (7) gas inlet of the natural gas mixing tank (7), and a gas mixing tank (7) on the natural gas mixing tank, and a gas inlet of the natural gas mixing tank (1) is arranged on the natural gas mixing tank;
a hydrogen inlet of the ammonia synthesis device (5), a nitrogen inlet of the ammonia synthesis device (5), an ammonia inlet of the gas mixing tank (7), a natural gas inlet of the gas mixing tank (7), a mixed gas outlet of the gas mixing tank (7), an outlet of the oxygen buffer tank (9) and an inlet of a combustion-supporting air channel of the natural gas ammonia combustor (1) are respectively provided with a flow regulating valve (15);
the water electrolysis hydrogen production tank (6) is connected with the green battery (17).
2. The natural gas ammonia-doped combustion system for coupling green hydrogen to produce ammonia according to claim 1, wherein the economizer group comprises a primary economizer (2) and a secondary economizer (3) which are sequentially connected in series, and a flue gas outlet of the secondary economizer (3) is connected with an inlet of a PSA carbon-nitrogen separation device (4).
3. The natural gas ammonia-doped combustion system for coupling green hydrogen to produce ammonia as claimed in claim 2, further comprising a desalting water tank (14);
the temperature of the flue gas can be reduced to be below a water dew point after passing through the secondary economizer (3), a water outlet is formed in the secondary economizer (3), the water outlet of the secondary economizer (3) is connected with a demineralized water tank (14), the demineralized water tank (14) is also connected with a cold end inlet of the secondary economizer (3), a cold end outlet of the secondary economizer (3) is connected with a cold end inlet of the primary economizer (2), and a cold end outlet of the primary economizer (2) is connected with a steam-water system inlet of a boiler (8); the water pump system is characterized in that a water outlet of the secondary economizer (3) is connected with a demineralized water tank (14), the demineralized water tank (14) is connected with a cold end inlet of the secondary economizer (3), water pumps are arranged on a cold end outlet of the secondary economizer (3) and a cold end inlet of the primary economizer (2) and a cold end outlet of the primary economizer (2) and a steam-water system inlet of the boiler (8), and a flow regulating valve is arranged at a water pump outlet of the demineralized water tank (14) and the cold end inlet of the secondary economizer (3).
4. The natural gas ammonia-mixing combustion system for coupling green hydrogen to produce ammonia according to claim 3, wherein the desalting water tank (14) is connected with the water electrolysis hydrogen production tank (6), a water pump is arranged on a pipeline connecting the desalting water tank (14) and the water electrolysis hydrogen production tank (6), and a flow regulating valve is arranged at an outlet of the water pump.
5. The natural gas ammonia-blending combustion system for coupling green hydrogen to prepare ammonia according to claim 2, further comprising a flue gas online analyzer (13), wherein a measuring hole of the flue gas online analyzer (13) is arranged on a pipeline connecting a flue gas outlet of the secondary economizer (3) and an inlet of the PSA carbon-nitrogen separation device (4).
6. The natural gas ammonia-mixing combustion system for coupling green hydrogen to prepare ammonia according to claim 1, wherein a nitrogen buffer tank (11) is arranged on a pipeline connecting a nitrogen outlet of the PSA carbon-nitrogen separation device (4) and a nitrogen inlet of the ammonia synthesis device (5), and a flow regulating valve is arranged at an outlet of the nitrogen buffer tank (11).
7. The natural gas ammonia-blending combustion system for coupling green hydrogen to prepare ammonia according to claim 1, wherein an ammonia buffer tank (10) is arranged on a pipeline connecting an ammonia gas outlet of the ammonia synthesis device (5) and an ammonia gas inlet of the gas mixing tank (7), and a flow regulating valve is arranged at an outlet of the ammonia buffer tank (10).
8. The natural gas ammonia-blending combustion system for coupling green hydrogen to prepare ammonia according to claim 1, further comprising a flue gas temperature online monitor (18), wherein a measuring point of the flue gas temperature online monitor (18) is arranged at a furnace outlet smoke transfer chamber of the boiler (8).
9. The natural gas ammonia-blending combustion system for coupling green hydrogen to produce ammonia according to claim 1, wherein a nitrogen outlet of the PSA carbon-nitrogen separation device (4) is connected with a carbon dioxide buffer tank (20).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20230088217A1 (en) * | 2021-09-22 | 2023-03-23 | Michael D. Mercer | Intelligent fuel storage system |
| CN116282069A (en) * | 2023-02-16 | 2023-06-23 | 河北正元氢能科技有限公司 | Gray hydrogen green hydrogen coupling ammonia production system |
| CN116395715A (en) * | 2023-06-07 | 2023-07-07 | 河北正元化工工程设计有限公司 | Process for preparing ammonia and co-producing nitric acid and ammonium nitrate by coupling green hydrogen and gray hydrogen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230088217A1 (en) * | 2021-09-22 | 2023-03-23 | Michael D. Mercer | Intelligent fuel storage system |
| US20230086470A1 (en) * | 2021-09-22 | 2023-03-23 | Michael D. Mercer | Energy utilization system |
| US11885270B2 (en) * | 2021-09-22 | 2024-01-30 | Michael D. Mercer | Energy utilization system |
| US11927144B2 (en) * | 2021-09-22 | 2024-03-12 | Michael D. Mercer | Intelligent fuel storage system |
| CN116282069A (en) * | 2023-02-16 | 2023-06-23 | 河北正元氢能科技有限公司 | Gray hydrogen green hydrogen coupling ammonia production system |
| CN116395715A (en) * | 2023-06-07 | 2023-07-07 | 河北正元化工工程设计有限公司 | Process for preparing ammonia and co-producing nitric acid and ammonium nitrate by coupling green hydrogen and gray hydrogen |
| CN116395715B (en) * | 2023-06-07 | 2023-08-18 | 河北正元化工工程设计有限公司 | Process for preparing ammonia and co-producing nitric acid and ammonium nitrate by coupling green hydrogen and gray hydrogen |
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