阅读说明：本技术 一种采用高温净化的高效整体煤气化燃料电池发电系统及方法 (High-efficiency integrated coal gasification fuel cell power generation system and method adopting high-temperature purification ) 是由 周贤 彭烁 许世森 钟迪 王保民 于 2019-12-10 设计创作，主要内容包括：本发明提供的一种采用高温净化的高效整体煤气化燃料电池发电系统及方法,包括备煤单元、气化炉、废热锅炉、高温除尘单元、水汽变换塔、精脱硫塔、引射器、燃料电池、纯氧燃烧器、燃气透平、阴极空气压缩机、阴极回热器、空气透平、余热锅炉和汽轮机；本发明避免了合成气降温脱硫再升温反应的过程,合成气显热全部输入了燃料电池单元；同时,避免了基于合成气溶液吸收法的脱硫过程,减少了吸收过程中合成气有效气的损失,大幅度提高了全系统的发电效率；同时省去了复杂的合成气冷却降温与溶液吸收法脱硫过程,简化了发电系统流程,提高了全系统运行稳定性与控制灵活性。(The invention provides a high-efficiency integrated coal gasification fuel cell power generation system and a method adopting high-temperature purification, which comprises a coal preparation unit, a gasification furnace, a waste heat boiler, a high-temperature dust removal unit, a water vapor conversion tower, a fine desulfurization tower, an ejector, a fuel cell, a pure oxygen combustor, a gas turbine, a cathode air compressor, a cathode regenerator, an air turbine, a waste heat boiler and a steam turbine, wherein the coal preparation unit is used for preparing coal; the invention avoids the process of cooling, desulfurizing and heating the synthesis gas, and the sensible heat of the synthesis gas is completely input into the fuel cell unit; meanwhile, a desulfurization process based on a synthetic gas solution absorption method is avoided, the loss of effective gas of the synthetic gas in the absorption process is reduced, and the power generation efficiency of the whole system is greatly improved; meanwhile, the complex processes of cooling the synthesis gas and desulfurizing by a solution absorption method are omitted, the flow of the power generation system is simplified, and the operation stability and the control flexibility of the whole system are improved.)

1. A high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification is characterized by comprising a coal preparation unit (1), a gasification furnace (2), a waste heat boiler (4), a high-temperature dust removal unit (5), a water vapor conversion tower (7), a fine desulfurization tower (8), an ejector (9), a fuel cell (10), a pure oxygen combustor (11), a gas turbine (12), a cathode air compressor (13), a cathode heat regenerator (15), an air turbine (16), a waste heat boiler (17) and a steam turbine (18), wherein a raw coal inlet and a desulfurizer inlet are formed in the coal preparation unit (1), and a mixture outlet of the coal preparation unit (1) is connected with an inlet of the gasification furnace (2); a high-temperature crude synthesis gas outlet on the gasification furnace (2) is connected with an inlet of a waste heat boiler (4), and a saturated steam outlet arranged on the waste heat boiler (4) is connected with an inlet of a waste heat boiler (17); a raw synthesis gas outlet arranged on the waste heat boiler (4) is connected with an inlet of the high-temperature dust removal unit (5), a synthesis gas outlet on the high-temperature dust removal unit (5) is divided into two paths, and one path is connected with a synthesis gas inlet of the waste heat boiler (4); the other path is connected with an inlet of a water-vapor conversion tower (7); a synthetic gas outlet of the water-vapor conversion tower (7) is connected with an inlet of the fine desulfurization tower (8), and a desulfurization synthetic gas outlet arranged on the fine desulfurization tower (8) is connected with an inlet of the ejector (9); the synthetic gas outlet of the ejector (9) is connected with the anode of the fuel cell (10), the anode outlet of the fuel cell (10) is divided into two paths, one path is connected with the ejector (9), and the other path is connected with the inlet of the pure oxygen combustor (11); a tail gas outlet of the pure oxygen combustor (11) is connected with a gas turbine (12), and a tail gas outlet of the gas turbine (12) is connected with an inlet of a waste heat boiler (17);

an air inlet is arranged on the cathode air compressor (13), a high-pressure air outlet of the cathode air compressor (13) is connected with a cold side inlet of the cathode regenerator (15), and a cold side outlet of the cathode regenerator (15) is connected with a cathode inlet of the fuel cell (10); the cathode outlet of the fuel cell (10) is connected with the hot side inlet of the cathode regenerator (15), the hot side outlet of the cathode regenerator (15) is connected with the air turbine (16), and the tail gas outlet of the air turbine (16) is connected with the inlet of the waste heat boiler (17);

a high-pressure superheated steam outlet of the waste heat boiler (17) is connected with an inlet of a steam turbine (18); a medium-pressure steam outlet of the steam turbine (18) is respectively connected with a steam inlet of the water-steam conversion tower (7) and a steam inlet of the gasification furnace (2);

a tail gas outlet of the waste heat boiler (17) is respectively connected with inlets of the gasification furnace (2) and the ejector (9);

and the gasification furnace (2) and the pure oxygen combustor (11) are both provided with pure oxygen inlets.

2. The high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification as claimed in claim 1, wherein the gasification furnace (2) is provided with a slag hole, the slag hole is connected with the inlet of the calcining furnace (3), and the calcining furnace (3) is provided with a slag discharge hole and an air inlet.

3. The high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification as claimed in claim 1, wherein a recycle gas compressor (6) is arranged between a synthesis gas outlet of the high-temperature dust removal unit (5) and a synthesis gas inlet of the waste heat boiler (4).

4. The high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification according to claim 1, characterized in that a first carbon dioxide compressor (20) is arranged between the tail gas outlet of the waste heat boiler (17) and the inlet of the gasification furnace (2); a second carbon dioxide compressor (19) is arranged between the tail gas outlet of the waste heat boiler (17) and the ejector (9).

5. The high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification as claimed in claim 1, wherein the tail gas outlet of the waste heat boiler (17) is further connected with a first waste heat recovery heat exchanger (21), the outlet of the first waste heat recovery heat exchanger (21) is connected with a third carbon dioxide multistage compressor (22), and a liquid carbon dioxide outlet is arranged on the third carbon dioxide multistage compressor (22).

6. The high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification according to claim 1, characterized in that a high-pressure air outlet of the cathode air compressor (13) is further connected with a cryogenic air separation unit (23), the cryogenic air separation unit (23) is provided with a waste nitrogen outlet, an argon outlet, an oxygen removal outlet and an air inlet, wherein a pure oxygen inlet of the cryogenic air separation unit (23) is respectively connected with an oxygen inlet of the gasification furnace (2) and an oxygen inlet of the oxygen removal combustor (11) through an oxygen compressor (24).

7. The high efficiency integrated coal gasification fuel cell power generation system using high temperature purification as claimed in claim 6, wherein a second waste heat recovery heat exchanger (14) is provided between the cathode air compressor (13) and the cryogenic air separation unit (23).

8. A high-efficiency integrated coal gasification fuel cell power generation method using high-temperature purification, which is based on any one of claims 1 to 7, and comprises the following steps:

raw coal and a desulfurizer are ground and dried in a coal preparation unit (1) to form a mixture of dry coal powder and the desulfurizer, high-pressure carbon dioxide gas is conveyed to a gasification furnace (2), medium and small amount of pressure steam and pure oxygen extracted from the middle part of a steam turbine (18) are simultaneously conveyed to the gasification furnace (2) for reaction, high-temperature crude synthesis gas generated at the top of the gasification furnace (2) and low-temperature synthesis gas generated by a high-temperature dust removal unit (5) are mixed and chilled, and then conveyed to a waste heat boiler (4), and saturated steam generated by the waste heat boiler (4) is conveyed to a waste heat boiler (17) for further heating; the raw synthesis gas after waste heat recovery by the waste heat boiler (4) is sent to a high-temperature dust removal unit (5), the other part of synthesis gas after dust removal is sent to a steam-steam conversion tower (7) to generate steam-steam conversion reaction and carbonyl sulfide hydrolysis reaction with a small amount of medium-pressure steam extracted from the middle part of a steam turbine (18), and the synthesis gas at the outlet of the steam-steam conversion tower (7) enters a fine desulfurization tower (8) to perform a high-temperature fine desulfurization process;

after mixing the synthesis gas at the outlet of the fine desulfurization tower (8) with the high-pressure carbon dioxide gas generated by the waste heat boiler (17), diluting the carbon monoxide gas in the synthesis gas, sending the diluted synthesis gas into an ejector (9), ejecting partial tail gas at the outlet of the anode of the fuel cell (10), and allowing the synthesis gas at the outlet of the ejector (9) to enter the anode of the fuel cell (10) for reaction;

the rest tail gas at the anode outlet of the fuel cell (10) enters a pure oxygen combustor (11) to perform catalytic combustion reaction with pure oxygen to generate combustion tail gas, the main components of the combustion tail gas are water vapor and carbon dioxide, and then the combustion tail gas is sent to a waste heat boiler (17) after being acted by a gas turbine (12);

one air is pressurized by a cathode air compressor (13), and then a part of the air is sent to a cold side inlet of a cathode heat regenerator (15), high-temperature air at a cold side outlet is sent to a cathode inlet of a fuel cell (10), the air is sent to a hot side inlet of the cathode heat regenerator (15) after reaction in the fuel cell (10), the air is sent to an air turbine (16) after temperature reduction, the air turbine (16) is driven to rotate to do work and then sent to a waste heat boiler (17), and waste heat is recycled and then discharged to the atmosphere;

the waste heat boiler (17) recovers the waste heat of tail gas exhausted by the gas turbine (12) and the air turbine (16), simultaneously superheats saturated steam generated by the waste heat boiler (4), and the waste heat boiler (17) generates high-pressure superheated steam and sends the high-pressure superheated steam to the steam turbine (18) to do work.

Technical Field

The invention belongs to the technical field of clean coal power generation, and particularly relates to a high-efficiency integrated coal gasification fuel cell power generation system and method adopting high-temperature purification.

Background

Coal is an important guarantee for energy safety in China. An integrated gasification fuel cell power generation system IGFC is a power generation system combining integrated gasification combined cycle power generation and a high-temperature fuel cell, and the IGFC breaks through the limit of the theoretical efficiency of Carnot cycle, has high power generation efficiency and has high pollutant and CO₂The method can achieve the characteristic of near zero emission and becomes an important choice for future coal-based power generation.

However, in the coal gasification process of IGFC, normal or low temperature absorption solvent is usually used to remove H₂S, the high-temperature synthesis gas is required to be subjected to a cooling and heating utilization process, so that the consumption of cold energy and heat energy of the whole system is very unfavorable, the problem of cold and heat diseases is serious, and the overall energy utilization efficiency of the system is difficult to improve.

The high-temperature purification technology comprises high-temperature dust removal and dry desulfurization technology, the high-temperature dust removal technology is commonly applied in the coal gasification process, and the dry desulfurization technology generally adopts ZnO and H₂S reacts to remove sulfur in the synthesis gas, but the sulfur capacity of ZnO is limited, and the ZnO can only be used as a fine desulfurization process after pre-desulfurization.

Disclosure of Invention

The invention aims to provide a high-efficiency integrated coal gasification fuel cell power generation system and method adopting high-temperature purification, which solve the defect that the energy utilization efficiency is difficult to improve in the coal gasification process of the conventional IGFC.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification, which comprises a coal preparation unit, a gasification furnace, a waste heat boiler, a high-temperature dust removal unit, a water vapor conversion tower, a fine desulfurization tower, an ejector, a fuel cell, a pure oxygen combustor, a gas turbine, a cathode air compressor, a cathode regenerator, an air turbine, a waste heat boiler and a steam turbine, wherein the coal preparation unit is provided with a raw coal inlet and a desulfurizer inlet, and a mixture outlet of the coal preparation unit is connected with an inlet of the gasification furnace; a high-temperature crude synthesis gas outlet on the gasification furnace is connected with an inlet of a waste heat boiler, and a saturated steam outlet arranged on the waste heat boiler is connected with an inlet of a waste heat boiler; a raw synthesis gas outlet arranged on the waste heat boiler is connected with an inlet of the high-temperature dust removal unit, a synthesis gas outlet on the high-temperature dust removal unit is divided into two paths, and one path is connected with a synthesis gas inlet of the waste heat boiler; the other path is connected with an inlet of the water-vapor conversion tower; a synthetic gas outlet of the water-vapor conversion tower is connected with an inlet of the fine desulfurization tower, and a desulfurized synthetic gas outlet arranged on the fine desulfurization tower is connected with an inlet of the ejector; the synthetic gas outlet of the ejector is connected with the anode of the fuel cell, the anode outlet of the fuel cell is divided into two paths, one path is connected with the ejector, and the other path is connected with the inlet of the pure oxygen combustor; the tail gas outlet of the pure oxygen combustor is connected with a gas turbine, and the tail gas outlet of the gas turbine is connected with the inlet of the waste heat boiler;

the cathode air compressor is provided with an air inlet, a high-pressure air outlet of the cathode air compressor is connected with a cold side inlet of the cathode heat regenerator, and a cold side outlet of the cathode heat regenerator is connected with a cathode inlet of the fuel cell; the cathode outlet of the fuel cell is connected with the hot side inlet of the cathode regenerator, the hot side outlet of the cathode regenerator is connected with the air turbine, and the tail gas outlet of the air turbine is connected with the inlet of the waste heat boiler;

a high-pressure superheated steam outlet of the waste heat boiler is connected with an inlet of a steam turbine; a medium-pressure steam outlet of the steam turbine is respectively connected with a steam inlet of the water-steam conversion tower and a steam inlet of the gasification furnace;

a tail gas outlet of the waste heat boiler is respectively connected with inlets of the gasification furnace and the ejector;

and the gasification furnace and the pure oxygen combustor are both provided with pure oxygen inlets.

Preferably, the gasification furnace is provided with a slag hole, the slag hole is connected with an inlet of the calcining furnace, and the calcining furnace is provided with a slag discharge hole and an air inlet.

Preferably, a recycle gas compressor is arranged between a synthesis gas outlet of the high-temperature dust removal unit and a synthesis gas inlet of the waste heat boiler.

Preferably, a first carbon dioxide compressor is arranged between the tail gas outlet of the waste heat boiler and the inlet of the gasification furnace; and a second carbon dioxide compressor is arranged between the tail gas outlet of the waste heat boiler and the ejector.

Preferably, the tail gas outlet of the waste heat boiler is further connected with a first waste heat recovery heat exchanger, the outlet of the first waste heat recovery heat exchanger is connected with a third carbon dioxide multistage compressor, and a liquid carbon dioxide outlet is formed in the third carbon dioxide multistage compressor.

Preferably, the high-pressure air outlet of the cathode air compressor is further connected with a cryogenic air separation unit, the cryogenic air separation unit is provided with a waste nitrogen outlet, an argon outlet, a deoxygenation outlet and an air inlet, and the pure oxygen inlet of the cryogenic air separation unit is respectively connected with the oxygen inlet of the gasification furnace and the oxygen inlet of the deoxygenation burner through the oxygen compressor.

Preferably, a second waste heat recovery heat exchanger is arranged between the cathode air compressor and the cryogenic air separation unit.

A high-efficiency integrated coal gasification fuel cell power generation method adopting high-temperature purification is based on the high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification, and comprises the following steps:

grinding coal of raw coal and a desulfurizer in a coal preparation unit, drying to form a mixture of dry coal powder and the desulfurizer, conveying the mixture to a gasification furnace by high-pressure carbon dioxide gas, simultaneously feeding a small amount of medium-pressure steam extracted from the middle part of a steam turbine and pure oxygen into the gasification furnace for reaction, mixing and chilling high-temperature crude synthesis gas generated at the top of the gasification furnace and low-temperature synthesis gas generated by a high-temperature dust removal unit, and then feeding the mixture into a waste heat boiler, wherein saturated steam generated by the waste heat boiler is fed into a waste heat boiler for further heating; feeding the crude synthesis gas after waste heat recovery by the waste heat boiler into a high-temperature dust removal unit, feeding the other part of the synthesis gas after dust removal into a steam-steam converter to perform steam-steam conversion reaction and carbonyl sulfide hydrolysis reaction with a small amount of medium-pressure steam extracted from the middle part of a steam turbine, and feeding the synthesis gas at the outlet of the steam-steam converter into a fine desulfurization tower to perform a high-temperature fine desulfurization process;

mixing the synthesis gas at the outlet of the fine desulfurization tower with high-pressure carbon dioxide gas generated by a waste heat boiler, diluting the carbon monoxide gas in the synthesis gas, feeding the diluted gas into an ejector, ejecting partial tail gas at the outlet of the anode of the fuel cell, and allowing the synthesis gas at the outlet of the ejector to enter the anode of the fuel cell for reaction;

the rest tail gas at the anode outlet of the fuel cell enters a pure oxygen combustor to perform catalytic combustion reaction with pure oxygen to generate combustion tail gas, wherein the main components of the combustion tail gas are water vapor and carbon dioxide, and then the combustion tail gas is sent to a waste heat boiler after being acted by a gas turbine;

one air is pressurized by a cathode air compressor, and then a part of the air is sent to a cold side inlet of a cathode regenerator, high-temperature air at a cold side outlet is sent to a cathode inlet of a fuel cell, the air is sent to a hot side inlet of the cathode regenerator after reaction in the fuel cell, the air is sent to an air turbine after cooling, the air turbine is driven to rotate to apply work and then sent to a waste heat boiler, and the waste heat is recycled and then discharged to the atmosphere;

the waste heat boiler recovers tail gas waste heat discharged by the gas turbine and the air turbine, simultaneously superheats saturated steam generated by the waste heat boiler, and generates high-pressure superheated steam which is sent to the steam turbine to do work.

Compared with the prior art, the invention has the beneficial effects that:

according to the high-efficiency integrated coal gasification fuel cell power generation system and method adopting high-temperature purification, the most of the desulfurization process is carried out in the gasification furnace, high-temperature synthesis gas can directly enter the fuel cell for power generation, the process of cooling, desulfurization and reheating reaction of the synthesis gas is avoided, and all sensible heat of the synthesis gas is input into the fuel cell unit; meanwhile, a desulfurization process based on a synthetic gas solution absorption method is avoided, the loss of effective gas of the synthetic gas in the absorption process is reduced, and the power generation efficiency of the whole system is greatly improved; the condensation of water vapor in the cooling process of the synthesis gas is avoided, the corrosion resistance requirement of downstream equipment materials is reduced, and the treatment capacity of the wastewater of the whole plant is reduced; meanwhile, the complex processes of cooling the synthesis gas and desulfurizing by a solution absorption method are omitted, the flow of the power generation system is simplified, and the operation stability and the control flexibility of the whole system are improved.

Drawings

Fig. 1 is a schematic configuration diagram of a power generation system according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in figure 1, the high-efficiency integrated coal gasification fuel cell power generation system adopting high-temperature purification provided by the invention comprises a coal preparation unit 1, a gasification furnace 2, a calcining furnace 3, a waste heat boiler 4, a high-temperature dust removal unit 5, a circulating gas compressor 6, a water-steam conversion tower 7, a fine desulfurization tower 8, an ejector 9, a fuel cell 10, a pure oxygen combustor 11, a gas turbine 12, a cathode air compressor 13, a second waste heat recovery heat exchanger 14, a cathode heat regenerator 15, an air turbine 16, a waste heat boiler 17, a steam turbine 18, a second carbon dioxide compressor 19, a first carbon dioxide compressor 20, a first waste heat recovery heat exchanger 21, a third carbon dioxide multistage compressor 22, a cryogenic unit 23 and an oxygen compressor 24, wherein, the coal preparation unit 1 is provided with a raw coal inlet and a desulfurizer inlet, and a mixture outlet of the coal preparation unit 1 is connected with an inlet of the gasification furnace 2; the gasification furnace 2 is provided with a slag hole and a high-temperature crude synthesis gas outlet, the high-temperature crude synthesis gas outlet on the gasification furnace 2 is connected with an inlet of the waste heat boiler 4, the slag hole on the gasification furnace 2 is connected with an inlet of the calcining furnace 3, and the calcining furnace 3 is provided with a slag discharge hole and an air inlet.

A saturated steam outlet arranged on the waste heat boiler 4 is connected with an inlet of the waste heat boiler 17.

A crude synthesis gas outlet arranged on the waste heat boiler 4 is connected with an inlet of a high-temperature dust removal unit 5, a fly ash outlet and a synthesis gas outlet are arranged on the high-temperature dust removal unit 5, the synthesis gas outlet on the high-temperature dust removal unit 5 is divided into two paths, and one path is connected with the synthesis gas inlet of the waste heat boiler 4 through a circulating gas compressor 6; the other path is connected with the inlet of the water-steam conversion tower 7.

The synthetic gas outlet of the water-vapor conversion tower 7 is connected with the inlet of the fine desulfurization tower 8, and the desulfurized synthetic gas outlet arranged on the fine desulfurization tower 8 is connected with the inlet of the ejector 9.

The synthetic gas outlet of the ejector 9 is connected with the anode of the fuel cell 10, the anode outlet of the fuel cell is divided into two paths, one path is connected with the ejector 9, and the other path is connected with the inlet of the pure oxygen burner 11.

The tail gas outlet of the pure oxygen combustor 11 is connected with a gas turbine 12, and the tail gas outlet of the gas turbine 12 is connected with the inlet of a waste heat boiler 17.

The tail gas outlet of the waste heat boiler 17 is divided into three paths, and one path is connected with the inlet of the gasification furnace 2 through a first carbon dioxide compressor 20; the second path is connected with the ejector 9 through a second carbon dioxide compressor 19; the third path is connected with the first waste heat recovery heat exchanger 21, the outlet of the first waste heat recovery heat exchanger 21 is connected with the third carbon dioxide multistage compressor 22, and the third carbon dioxide multistage compressor 22 is provided with a liquid carbon dioxide outlet.

An air inlet is arranged on the cathode air compressor 13, a high-pressure air outlet of the cathode air compressor 13 is divided into two paths, one path is connected with a cold side inlet of a cathode heat regenerator 15, and a cold side outlet of the cathode heat regenerator 15 is connected with a cathode inlet of the fuel cell 10; the cathode outlet of the fuel cell 10 is connected with the hot side inlet of the cathode heat regenerator 15, the hot side outlet of the cathode heat regenerator 15 is connected with the air turbine 16, and the tail gas outlet of the air turbine 16 is connected with the inlet of the waste heat boiler 17;

the other path of high-pressure air outlet of the cathode air compressor 13 is connected with the cryogenic air separation unit 23 through the second waste heat recovery heat exchanger 14, the cryogenic air separation unit 23 is provided with a waste nitrogen outlet, an argon outlet, a deoxygenation outlet and an air inlet, wherein the pure oxygen inlet of the cryogenic air separation unit 23 is respectively connected with the oxygen inlet of the gasification furnace 2 and the oxygen inlet of the deoxygenation burner 11 through the oxygen compressor 24.

The high-pressure superheated steam of the waste heat boiler 17 is connected with the inlet of a steam turbine 18; the medium pressure steam outlet of the steam turbine 18 is respectively connected with the steam inlet of the steam-water shift tower 7 and the steam inlet of the gasification furnace 2.

The waste heat boiler 17 is also provided with an exhaust port.

The system flow is as follows:

the raw coal and the desulfurizer are ground and dried in the coal preparation unit 1 to form a mixture of dry coal powder and the desulfurizer, high-pressure carbon dioxide gas generated by a first carbon dioxide compressor 20 is conveyed to the gasification furnace 2, part of pure oxygen at the outlet of the oxygen compressor 24 and a small amount of medium-pressure steam extracted from the middle part of the steam turbine 18 are simultaneously conveyed to the gasification furnace 2 to react, slag generated at the bottom of the gasification furnace 2 enters the calcining furnace 3 and reacts with air to form final-form slag containing calcium sulfate. The high-temperature crude synthesis gas generated at the top of the gasification furnace 2 and the low-temperature synthesis gas at the outlet of the circulating gas compressor 6 are mixed and chilled, then the mixture is sent to a waste heat boiler 4, saturated steam generated by the waste heat boiler 4 is sent to a waste heat boiler 17 for further heating, the crude synthesis gas after waste heat recovery by the waste heat boiler is sent to a high-temperature dust removal unit 5, part of the synthesis gas after dust removal is circulated to the inlet of the circulating gas compressor 6, and the other part of the synthesis gas is sent to a water vapor conversion tower 7 to perform water vapor conversion reaction and carbonyl sulfide hydrolysis reaction with a small amount of medium-pressure steam extracted from the middle. And the synthesis gas at the outlet of the water-vapor shift tower 7 enters a fine desulfurization tower 8 to carry out a high-temperature fine desulfurization process.

After mixing the synthesis gas at the outlet of the fine desulfurization tower 8 with the high-pressure carbon dioxide gas generated by the second carbon dioxide compressor 19, diluting the carbon monoxide gas in the synthesis gas, sending the diluted synthesis gas into the ejector 9, ejecting part of tail gas at the outlet of the anode of the fuel cell 10, and allowing the synthesis gas at the outlet of the ejector 9 to enter the anode of the fuel cell 10 for reaction; the rest tail gas at the outlet of the anode of the fuel cell 10 enters a pure oxygen combustor 11 to perform catalytic combustion reaction with partial pure oxygen at the outlet of an oxygen compressor 24, combustion tail gas is generated, the main components of the combustion tail gas are water vapor and carbon dioxide, the water vapor and the carbon dioxide are subjected to work by a gas turbine 12 and then are sent into a waste heat boiler 17, the combustion tail gas is cooled and then is divided into three streams, the first stream is sent into an inlet of a first carbon dioxide compressor 20, the second stream is sent into an inlet of a second carbon dioxide compressor 19, the third stream is sent into a first waste heat recovery heat exchanger 21, the condensation is cooled, moisture is removed and then is sent into a third. One air is pressurized by a cathode air compressor 13, and then a part of the air is sent to a cold side inlet of a cathode heat regenerator 15, high-temperature air at a cold side outlet is sent to a cathode inlet of a fuel cell 10, the air is sent to a hot side inlet of the cathode heat regenerator 15 after reacting in the fuel cell 10, the air is sent to an air turbine 16 after cooling, the air turbine 16 is sent to a waste heat boiler 17 after driving the air turbine 16 to rotate to do work, and the air is discharged to the atmosphere after waste heat is recovered; the other part of air at the outlet of the cathode air compressor 13 is sent into a second waste heat recovery heat exchanger 14 and then sent into a cryogenic air separation unit 23, an argon separation process is arranged in the cryogenic air separation unit 23, waste nitrogen generated by the cryogenic air separation unit 23 is discharged into the atmosphere, and the generated pure argon can be used as a product to generate high-purity oxygen and sent into an inlet of an oxygen compressor 24; the exhaust-heat boiler 17 recovers exhaust gas waste heat discharged from the gas turbine 12 and the air turbine 16, and superheats saturated steam generated by the exhaust-heat boiler 4, and the exhaust-heat boiler 17 generates high-pressure superheated steam which is sent to the steam turbine 18.

The electrical power generated by the system is generated by a fuel cell 10, a gas turbine 12, an air turbine 16, and a steam turbine 18.