Resource utilization and zero emission system for fossil energy combustion pollutants

Abstract

The invention belongs to the field of fossil energy combustion and energy conservation and emission reduction, and relates to a fossil energy combustion pollutant resource utilization and zero emission system which comprises an air separation device, an oxygen-enriched combustion system, a dust removal device, a desulfurization device, a water treatment device and a CO2 recovery device. According to the scheme provided by the invention, inhalable particles and nitrogen oxides generated by fossil energy combustion can be greatly reduced, carbon dioxide and sulfides generated by fossil energy combustion are comprehensively recycled, and zero emission of combustion pollutants is realized.

Description

Technical Field

[0001] The present invention relates to the field of fossil energy combustion and energy conservation and emission reduction, and in particular to a resource utilization and zero-emission system of fossil energy combustion pollutants. Background Art

[0002] The main energy sources in the world today are still fossil energy, such as coal, oil and natural gas. The pollutants produced by the combustion of fossil energy mainly include carbon dioxide, sulfur dioxide, nitrogen oxides, inhalable particulate matter, etc. In order to reduce the emission of pollutants from fossil energy, humans have taken a variety of measures to reduce the emission of pollutants or increase the control of pollutants. For example, the wet desulfurization process will form white smoke plumes, SCR denitrification will have secondary pollution from ammonia escape, and the absorption / adsorption method is costly to capture CO2. These measures cannot eliminate the pollutant emissions caused by the combustion of fossil energy from the source, and increase the cost of equipment investment.

[0003] The resource and environmental problems caused by the combustion and use of fossil energy have increasingly attracted widespread attention from the international community. How to achieve resource utilization and zero emission of pollutants from the combustion of fossil energy is the direction pursued in this field. Summary of the invention

[0004] The present invention aims to address the technical problems existing in the prior art and provide a fossil energy combustion pollutant resource utilization and zero emission system, which can significantly reduce the inhalable particulate matter and nitrogen oxides produced by the combustion of fossil energy, and comprehensively recycle the carbon dioxide and sulfide produced by the combustion of fossil energy, thereby achieving zero emission of combustion pollutants.

[0005] In order to achieve the above technical effects, the technical solution provided according to the present invention is as follows:

[0006] A resource utilization and zero-emission system for fossil energy combustion pollutants, comprising:

[0007] Air separation unit, oxygen-enriched combustion system, dust removal unit, desulfurization unit, CO 2 Recovery devices and water treatment devices;

[0008] The air separation device, oxygen-enriched combustion system, dust removal device, desulfurization device, CO 2 The recovery devices are connected in sequence via pipelines;

[0009] Air separation unit is used to separate air to produce O 2 and N 2 , the generated O 2 Supplied to the oxygen-enriched combustion system to support the combustion of fossil energy; the N 2 Output as a by-product, or used for synthesizing ammonia;

[0010] The flue gas generated by the combustion of fossil energy is treated by the dust removal device and desulfurization device and then enters the CO 2 Recovery device recovers CO 2 ; The recovered CO 2 As liquid CO 2 The product is exported or used as a raw material to prepare methanol or urea;

[0011] The desulfurization device is used to remove sulfides from flue gas and recover SO 2 ; Recovered SO 2 For use in the synthesis of ammonium sulfate or in the preparation of sulfuric acid;

[0012] The desulfurization device is connected to the water treatment device. The wastewater discharged from the desulfurization device is used for electrolysis of water to prepare H after water treatment. 2 and O 2 ;

[0013] The prepared O 2 Used to support the combustion of fossil energy; the prepared H 2 The product is output as liquid hydrogen, or used as a raw material for synthesizing methanol or ammonia; the synthesized ammonia is output as liquid ammonia, or used as a raw material for preparing ammonium sulfate.

[0014] The basic principles of the above technical solution of the present invention are as follows:

[0015] Air separation unit is used to separate air to obtain N 2 and O 2 , N 2 Output as a by-product, or used for synthesizing ammonia;

[0016] O separated from the air separation unit 2 The air is sent to the oxygen-enriched combustion system as the oxidant required for the combustion of fossil energy. Under oxygen-enriched conditions, the nitrogen oxides in the flue gas produced by the oxygen-enriched combustion system are extremely low in emission, reducing the impact on the environment. At the same time, CO in the flue gas 2 The volume fraction of gas is significantly increased (CO 2 The flue gas is directly used to recover CO after dust removal and desulfurization. 2 , reducing carbon emissions and lowering the greenhouse effect; the recovered CO 2 As liquid CO 2 The product is exported or used as a raw material to prepare methanol or urea;

[0017] On the other hand, the flue gas discharged from the oxygen-enriched combustion system is desulfurized by a desulfurization device to remove sulfides from the flue gas and recover SO 2 , achieving zero emission of sulfides; the recovered SO 2 For use in the synthesis of ammonium sulfate or in the preparation of sulfuric acid;

[0018] The wastewater generated by the desulfurization device is used for electrolysis of water to produce H after water treatment. 2 and O 2 , to achieve the purification and recycling of wastewater, reduce wastewater discharge and save water. 2 Used to support the combustion of fossil energy; the prepared H 2 The product is output as liquid hydrogen, or used as a raw material for synthesizing methanol or ammonia; the synthesized ammonia is output as liquid ammonia, or used as a raw material for preparing ammonium sulfate.

[0019] According to the technical solution of the present invention, the fossil energy includes any form of fossil fuel, such as coal, oil, natural gas, etc.

[0020] According to the technical solution of the present invention, preferably, the system also includes a flue gas reflux device, and part of the flue gas exhausted from the oxygen-enriched combustion system is transported to the inlet of the oxygen-enriched combustion system through the flue gas reflux device, and mixed with the oxygen output by the air separation device, and recycled flue gas is used instead of nitrogen as a diluent for oxygen, thereby improving the completeness of combustion, significantly reducing the exhaust volume of the oxygen-enriched combustion system, reducing the emission of pollutants, reducing exhaust heat loss, and significantly improving the thermal efficiency of the oxygen-enriched combustion system.

[0021] The present invention has no particular limitation on the smoke reflow device. Preferably, the smoke reflow device disclosed in the CN105823074A application is adopted.

[0022] According to the technical solution of the present invention, the air separation device belongs to the common equipment in the field, and the present invention does not limit this. Preferably, the air separation device disclosed in the CN105823074A application is used, and oxygen can be obtained by using methods such as "air pressure swing adsorption method", "air membrane filtration method", "air deep cold processing method", "oxygen from liquid oxygen tank or pipeline", etc.

[0023] According to the technical solution of the present invention, the oxygen-enriched combustion system controls nitrogen entering the combustion system from the source, thereby truly achieving ultra-low nitrogen oxide emissions; the present invention does not limit the oxygen-enriched combustion system, and preferably, the oxygen-enriched combustion system disclosed in the CN105823074A application is adopted.

[0024] According to the technical solution of the present invention, the dust removal device adopts common equipment in the art, and the present invention does not limit this. Preferably, an electrostatic dust removal device is adopted.

[0025] According to the technical solution of the present invention, CO 2 The recovery device is a common device in this field and is not limited in the present invention. 2 As liquid CO 2 Product output; or used as raw material for synthesizing methanol or urea;

[0026] More preferably, the device further comprises a cold recovery device, which recovers the liquid O generated by the air separation device. 2 and / or liquid N 2 , the cold energy is recovered by the cold energy recovery device and used for CO 2 Recovery device recovers CO 2 ;

[0027] According to the technical solution of the present invention, SO recovered by the desulfurization device 2 Used in the synthesis of ammonium sulfate or in the preparation of sulfuric acid;

[0028] The SO 2 The recycling includes SO 2 The amine liquid is used as the absorbent. After the dust-removed flue gas enters the desulfurization device, in the absorption section, the SO 2 Contacting with amine solution and being absorbed, the flue gas after desulfurization enters CO 2 Recovery system. Absorbs SO 2 The amine solution enters the desorption part for regeneration, and the regenerated amine solution is circulated in the system. This process reduces the consumption of chemicals such as limestone or caustic soda, almost completely eliminates the generation of solid waste, avoids the white plume phenomenon caused by gypsum desulfurization, and recovers SO 2 Bring certain economic benefits.

[0029] Further preferably, the present invention further comprises a flue gas heat recovery device for recovering heat from the flue gas and using the recovered heat for decomposing the amine solution in the desulfurization device to achieve SO 2 The flue gas heat recovery device is a common device in the art, and the present invention does not limit this.

[0030] According to the technical solution of the present invention, the water treatment device adopts common equipment in the field. Preferably, a mechanical vapor compression (MVC) water treatment system is adopted, and the wastewater is treated by MVC water treatment technology, and the water quality index is excellent, and it can be directly used for electrolysis of water, or for boiler replenishment or system circulating cooling water replenishment.

[0031] Preferably, the wastewater is treated by a water treatment device and then enters a water electrolysis hydrogen production device for preparing H 2 and O 2 The water electrolysis hydrogen production device is a common device in the art, and the present invention does not limit this.

[0032] Further preferably, the present invention uses valley electricity as power supply. Valley electricity is also called low valley electricity, which is a way of expressing relative to the peak period of electricity consumption. Using electricity during the valley period not only reduces power loss but also reduces the power load during the peak period, thereby achieving the effect of shaving the peak and filling the valley, which is used to alleviate the power supply pressure during the peak period of electricity consumption.

[0033] According to the technical solution of the present invention, the O generated by electrolysis of water 2 The pipeline is connected to the inlet of the oxygen-enriched combustion system to support the combustion of fossil energy; H produced by electrolysis of water 2 Export as liquid hydrogen product; or use in synthesizing ammonia or methanol;

[0034] When H is prepared by electrolysis of water 2 When used for synthesizing ammonia, preferably, an air separation device is used to separate air to obtain N 2 As raw material, the air separation unit separates air to obtain N 2 With H 2 The two are jointly input into an ammonia synthesis device to prepare ammonia; the ammonia synthesis device is a common device in the art and is not limited in the present invention.

[0035] The prepared ammonia can be output as liquid ammonia product; or used as raw material for synthesizing ammonium sulfate or urea;

[0036] When the prepared ammonia is used to synthesize ammonium sulfate, preferably, the SO 2 The raw materials are input into a synthetic ammonium sulfate device to prepare ammonium sulfate; the synthetic ammonium sulfate device is a common equipment in the art, and the present invention does not limit this.

[0037] When the prepared ammonia is used to synthesize urea, preferably, the recovered CO 2 Raw materials, ammonia and CO 2 The urea synthesis device is commonly used in the art and is not limited in the present invention.

[0038] When H is prepared by electrolysis of water 2 When used for methanol synthesis, it is preferred to use the recovered CO 2 As raw material, CO 2 With H 2 The two are input together into a synthetic methanol device, which is a common device in the art and is not limited in the present invention.

[0039] According to the technical solution of the present invention, SO recovered by the desulfurization device 2 When used to prepare sulfuric acid, SO 2 The sulfuric acid is input into a synthetic sulfuric acid device, which is a common device in the art and is not limited in the present invention.

[0040] The resource utilization and zero emission system of fossil energy combustion pollutants provided by the present invention can achieve zero emission of pollutants and comprehensive utilization of energy.

[0041] From the perspective of material utilization:

[0042] Use air separation unit to separate air to obtain N 2 and O 2 , N 2 Output as a by-product, or used to synthesize ammonia with hydrogen obtained by electrolysis of water. The synthesized ammonia can be output as a liquid ammonia product, or further used as a raw material for synthesizing ammonium sulfate or urea;

[0043] Controlling N at the source using an oxygen-enriched combustion system 2 The input of flue gas has ultra-low nitrogen oxide emissions, which reduces the impact on the environment. 2 The volume fraction of gas is significantly increased (CO 2 content above 80%), can be directly used to recover CO 2 ;

[0044] Utilizing CO 2 Recovery device recovers CO from flue gas 2 , reducing carbon emissions and lowering the greenhouse effect; recycled CO 2 Can be used as liquid CO 2 Product output or used for H prepared by electrolysis of water 2 Synthesize methanol, or use it together with prepared ammonia to synthesize urea;

[0045] Use desulfurization equipment to remove sulfides from flue gas and recover SO 2 , achieving zero emission of sulfides; the recovered SO 2 It can be used to synthesize ammonium sulfate together with synthetic ammonia, or to prepare sulfuric acid products;

[0046] The wastewater is treated by water treatment equipment and the treated wastewater is used for electrolysis of water to produce H 2 and O 2 , achieve the purification and recycling of wastewater, reduce wastewater discharge and save water;

[0047] H prepared by electrolysis of water 2 It can be exported as liquid hydrogen product, or used as raw material to synthesize methanol or ammonia; O produced by electrolysis of water 2 The oxygen-enriched combustion system is used to support the combustion of fossil fuels.

[0048] From the perspective of energy utilization: the liquid O generated by the air separation unit is recovered by the cold recovery unit. 2 and / or liquid N 2 Recover cold energy from the2 Recovery device recovers CO 2 ; Use the flue gas heat recovery device to recover heat from the flue gas, and use the recovered heat to analyze the amine liquid in the desulfurization device to achieve SO 2 of recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 : Schematic diagram of the structure of the fossil energy combustion pollutant resource utilization and zero emission system shown in the present invention.

[0050] Description of reference numerals:

[0051] Air separation device 1, oxygen-enriched combustion system 2, dust removal device 3, desulfurization device 4, CO 2 Recovery device 5, water treatment device 6, cold recovery device 7, water electrolysis hydrogen production device 8, ammonia synthesis device 9, ammonium sulfate synthesis device 10, methanol synthesis device 11, urea synthesis device 12, sulfuric acid synthesis device 13, flue gas heat recovery device 14; flue gas reflux device 15. DETAILED DESCRIPTION

[0052] The present invention will now be further described in conjunction with the accompanying drawings, but the following embodiments do not constitute a limitation of the present invention.

[0053] Figure 1 The schematic diagram of the structure of the fossil energy combustion pollutant resource utilization and zero emission system provided by the present invention is shown.

[0054] like Figure 1 As shown, the fossil energy combustion pollutant resource utilization and zero emission system includes:

[0055] Air separation device 1, oxygen-enriched combustion system 2, dust removal device 3, desulfurization device 4, CO 2 Recovery device 5, water treatment device 6;

[0056] Air separation device 1, oxygen-enriched combustion system 2, dust removal device 3, desulfurization device 4, CO 2 The recovery device 5 is connected in sequence through pipelines,

[0057] The air separation device 1 is used to separate air to produce O 2 and N 2 , the generated O 2 Supplied to the oxygen-enriched combustion system to support the combustion of fossil energy; the N 2 Output as a by-product, or used for synthesizing ammonia;

[0058] The flue gas generated by the combustion of fossil energy is processed by the dust removal device 3 and the desulfurization device 4 in turn, and then enters the CO 2 Recovery device 5 recovers CO2 ; The recovered CO 2 As liquid CO 2 The product is exported or used as a raw material to prepare methanol or urea;

[0059] The desulfurization device 4 is used to remove sulfides from flue gas and recover SO 2 ; The recovered SO2 is used to synthesize ammonium sulfate or to prepare sulfuric acid;

[0060] The desulfurization device 4 is connected to the water treatment device 6, and the wastewater is used for electrolysis of water to prepare H after water treatment. 2 and O 2 ;

[0061] The prepared O 2 Used to support the combustion of fossil energy; the prepared H 2 The product is output as liquid hydrogen, or used as a raw material for synthesizing methanol or ammonia; the synthesized ammonia is output as liquid ammonia, or used as a raw material for preparing ammonium sulfate.

[0062] The system also includes a flue gas reflow device 15, through which part of the flue gas exhausted from the oxygen-enriched combustion system is transported to the inlet of the oxygen-enriched combustion system 2 and mixed with the oxygen output by the air separation device 1. Circulating flue gas is used instead of nitrogen as a diluent to improve the completeness of combustion, significantly reduce the amount of smoke exhausted from the oxygen-enriched combustion system 2, reduce the emission of pollutants, reduce heat loss from smoke exhaust, and significantly improve the thermal efficiency of the oxygen-enriched combustion system.

[0063] The present invention has no particular limitation on the smoke reflow device. Preferably, the smoke reflow device disclosed in the CN105823074A application is adopted.

[0064] The air separation device 1 is a common device in the art, and the present invention does not limit this. Preferably, the air separation device disclosed in the CN105823074A application is used, and oxygen can be obtained by using methods such as "air pressure swing adsorption method", "air membrane filtration method", "air cryogenic processing method", "oxygen from liquid oxygen tank or pipeline", etc.

[0065] The oxygen-enriched combustion system 2 controls nitrogen from the source to enter the combustion system, thereby achieving true ultra-low nitrogen emissions; the present invention does not limit the oxygen-enriched combustion system. Preferably, the oxygen-enriched combustion system disclosed in the CN105823074A application is used.

[0066] The dust removal device 3 adopts common equipment in this field, preferably, an electrostatic dust removal equipment.

[0067] The CO 2 The recovery device 5 is a common device in the art and is not limited in the present invention. 2As liquid CO 2 Product output; either for synthesizing methanol or for synthesizing urea;

[0068] It is further preferred that the liquid O produced from the air separation device 1 2 and / or liquid N 2 , the cold energy is recovered by the cold energy recovery device 7 and used for CO 2 Recovery device 5 recovers CO 2 ;

[0069] SO recovered by desulfurization device 4 2 Used to synthesize ammonium sulfate or to prepare sulfuric acid; SO 2 The recovery includes absorption and analysis. Amine liquid is used as the absorbent. After the dust-removed flue gas enters the desulfurization device, in the absorption section, SO 2 After multi-stage countercurrent contact with amine liquid and absorption, the desulfurized flue gas enters the CO 2 Recovery system. Absorbs SO 2 The amine solution enters the desorption part for regeneration, and the regenerated amine solution is circulated in the system. This process reduces the consumption of chemicals such as limestone or caustic soda, almost completely eliminates the generation of solid waste, and avoids the white feather phenomenon caused by gypsum desulfurization.

[0070] The device also includes a flue gas heat recovery device 14, which is used to recover heat from the flue gas and use the recovered heat in the desulfurization device to achieve SO 2 The flue gas heat recovery device is a common device in the art, and the present invention does not limit this.

[0071] The water treatment device 6 adopts common equipment in this field, preferably, a mechanical vapor compression (Mechanical Vapor Compression, MVC for short) water treatment system.

[0072] After being treated by the water treatment device 6, the wastewater enters the water electrolysis hydrogen production device 8 for electrolysis of water to produce H 2 and O 2 Preferably, the present invention uses valley electricity as the electrical energy source for the water electrolysis hydrogen production device to alleviate the power supply pressure during peak power consumption periods.

[0073] O produced by water electrolysis 2 The pipeline is connected to the inlet of the oxygen-enriched combustion system 2 to support the combustion of fossil energy; H 2 Export as liquid hydrogen product; or use in synthesizing ammonia or methanol;

[0074] When H is prepared by electrolysis of water 2 When used for synthesizing ammonia, preferably, an air separation device is used to separate air to obtain N 2As raw material; air separation device separates air to obtain N 2 H prepared by electrolysis of water 2 They are fed together into the ammonia synthesis unit 9 for preparing ammonia.

[0075] The prepared ammonia gas can be output as liquid ammonia product; or used as raw material for synthesizing ammonium sulfate or urea.

[0076] When the prepared ammonia is used to synthesize ammonium sulfate, preferably, the SO 2 The raw materials are input into the synthetic ammonium sulfate device 10 to prepare ammonium sulfate.

[0077] When the prepared ammonia is used to synthesize urea, preferably, the recovered CO 2 Raw materials, ammonia and CO 2 They are input together into the urea synthesis device 12 .

[0078] When H is prepared by electrolysis of water 2 When used for methanol synthesis, it is preferred to use the recovered CO 2 As raw material, CO 2 With H 2 They are input together into the synthetic methanol device 11 .

[0079] SO recovered by desulfurization device 2 When used to prepare sulfuric acid, SO 2 It is input to the synthetic sulfuric acid device 13.

[0080] Separate air to obtain N using an air separation unit 2 The air separation device separates air to obtain N2 and H prepared by electrolysis of water. 2 They are fed together into the ammonia synthesis unit 9 for preparing ammonia.

[0081] Ammonia gas produced by synthetic ammonia equipment can be exported as liquid ammonia product; or used as raw material to produce ammonium sulfate;

[0082] When the prepared ammonia is used to prepare ammonium sulfate, preferably, the SO 2 The raw materials are input into the synthetic ammonium sulfate device to prepare ammonium sulfate.

[0083] The resource utilization and zero emission system of fossil energy combustion pollutants provided by the present invention can achieve zero emission of pollutants and comprehensive utilization of energy.

[0084] From the perspective of material utilization:

[0085] Use air separation unit to separate air to obtain N 2 and O 2 , N 2It can be used as a by-product, or used to synthesize ammonia with hydrogen obtained by electrolysis of water. The synthesized ammonia can be output as liquid ammonia product, or further used as a raw material for synthesizing ammonium sulfate or urea;

[0086] Controlling N at the source using an oxygen-enriched combustion system 2 The input of the flue gas produces ultra-low nitrogen oxide emissions, reducing the impact on the environment. 2 The volume fraction of gas is significantly increased (CO 2 content above 80%), can be directly used to recover CO 2 ;

[0087] Utilizing CO 2 Recovery device recovers CO from flue gas 2 , reducing carbon emissions and lowering the greenhouse effect; recycled CO 2 Can be used as liquid CO 2 Product output or used for H prepared by electrolysis of water 2 Synthesize methanol, or use it together with prepared ammonia to synthesize urea;

[0088] Use desulfurization equipment to remove sulfides from flue gas and recover SO 2 , achieving zero emission of sulfides; the recovered SO 2 It can be used to synthesize ammonium sulfate together with synthetic ammonia, or to prepare sulfuric acid products;

[0089] The wastewater is treated by water treatment equipment and the treated wastewater is used for electrolysis of water to produce H 2 and O 2 , achieve the purification and recycling of wastewater, reduce wastewater discharge and save water;

[0090] H prepared by electrolysis of water 2 Can be used to synthesize methanol or ammonia; O produced by electrolysis of water 2 It can be input into oxygen-enriched combustion system to support the combustion of fossil energy.

[0091] From the perspective of energy utilization:

[0092] Liquid O produced from the air separation unit 2 and / or liquid N 2 The recovered cold is used for CO 2 Recovery device recovers CO 2 ; Through the flue gas heat recovery device, heat is recovered from the flue gas and used in the desulfurization device to achieve SO 2 of recycling.

[0093] The resource utilization and zero emission system of fossil energy combustion pollutants provided by the present invention can significantly reduce the inhalable particulate matter and nitrogen oxides produced by the combustion of fossil energy, and comprehensively recycle the carbon dioxide and sulfide produced by the combustion of fossil energy, thereby achieving zero emission of combustion pollutants.

[0094] The present invention has been introduced in detail above. Specific examples have been used in the specification to illustrate the principles and implementation methods of the present invention. However, the examples are only used to help understand the present invention and should not be construed as limiting the present invention.

Claims

1. A resource utilization and zero-emission system for pollutants from fossil energy combustion, including the following features: Air separation unit, oxygen-enriched combustion system, dust removal unit, desulfurization unit, CO2 recovery unit and water treatment unit; The air separation unit, oxygen-enriched combustion system, dust removal unit, desulfurization unit, and CO2 recovery unit are connected in sequence through pipelines; The air separation unit is used to separate air to produce O2 and N2. The produced O2 is supplied to the oxygen-enriched combustion system to support the combustion of fossil energy; The flue gas generated after the combustion of fossil energy is processed by the dust removal device and the desulfurization device in turn, and then enters the CO2 recovery device to recover CO2; The desulfurization device is used to remove sulfides from flue gas and recover SO2; The desulfurization device is connected to the water treatment device, and the wastewater is used for electrolysis to produce H2 and O2 after water treatment.

2. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 1 is characterized by: It also includes a flue gas reflux device, through which part of the flue gas discharged from the oxygen-enriched combustion system is transported to the inlet of the oxygen-enriched combustion system, mixed with the oxygen output by the air separation device, and then input into the oxygen-enriched combustion system.

3. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 1 is characterized by: It also includes a cold recovery device, which is used to recover cold from liquid O2 and / or liquid N2 produced by the air separation device and used for the CO2 recovery device to recover CO2.

4. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 1 is characterized by: It also includes a flue gas heat recovery device for recovering heat from the flue gas, and using the recovered heat in the desulfurization device to achieve SO2 recovery.

5. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 1 is characterized by: The O2 obtained by electrolyzing water is connected to the inlet of the oxygen-enriched combustion system through a pipeline to support the combustion of fossil energy.

6. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 1 is characterized by: Air is separated by an air separation device to obtain N2 which is output as liquid nitrogen product or used to synthesize ammonia with H2 obtained by electrolysis of water.

7. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 6 is characterized by: The synthesized ammonia is output as liquid ammonia product or used as raw material for synthesizing ammonium sulfate or urea.

8. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 1 is characterized by: The H2 obtained by electrolysis of water is output as a liquid hydrogen product, or used as a raw material to react with recovered CO2 to produce methanol.

9. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 7 is characterized by: The recovered SO2 is used as a raw material to react with the synthesized ammonia to prepare ammonium sulfate.

10. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 7 is characterized by: The recovered CO2 is used as a raw material to react with synthesized ammonia to produce urea.

11. The fossil energy combustion pollutant resource utilization and zero emission system according to claim 1 is characterized by: The recovered SO2 is used as a raw material for preparing sulfuric acid.

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