CN111237734A - Three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system and operation method - Google Patents
Three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system and operation method Download PDFInfo
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- CN111237734A CN111237734A CN202010164747.6A CN202010164747A CN111237734A CN 111237734 A CN111237734 A CN 111237734A CN 202010164747 A CN202010164747 A CN 202010164747A CN 111237734 A CN111237734 A CN 111237734A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/08—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass at critical or supercritical pressure values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
- F22G1/04—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler by diverting flow or hot flue gases to separate superheaters operating in reheating cycle, e.g. for reheating steam between a high-pressure turbine stage and an intermediate turbine stage
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Abstract
A three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system and an operation method thereof are disclosed, the system adopts a three-stage regenerator arrangement, a part of supercritical carbon dioxide working medium with higher temperature is shunted from a cold side outlet of a middle-temperature regenerator, the supercritical carbon dioxide working medium is expanded and does work at a first-stage medium-pressure turbine part, then enters a boiler tail partial flow superheater for reheating, the temperature is raised and is completely expanded and does work at a second-stage medium-pressure turbine, and the temperature is lowered and then converges to a hot side inlet of the middle-temperature regenerator, so that on one hand, the heat of the middle-temperature flue gas at the tail part of the boiler is recovered, the exhaust gas temperature of the boiler; the invention has higher power generation efficiency and is also suitable for the field of power generation by taking the solar chimney as a heat source.
Description
Technical Field
The invention relates to the technical field of coal-fired power generation, in particular to a three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system and an operation method.
Background
Coal-fired power generation is a main power generation mode in China, but coal-fired power generation causes environmental pollution, so that the improvement of the power generation efficiency of thermal power generation and the reduction of coal combustion have great significance for energy conservation and emission reduction in China. In recent years, the conventional steam power cycle thermal power generation technology is mature, and the technology for improving the thermal power generation efficiency is changed from the modes of improving initial parameters, reheating steam and the like to the directions of full-working-condition operation, deep utilization of waste heat and the like. Therefore, changing the development thought of thermal power and renovating the thermal power generation technology have important significance for improving the thermal power generation efficiency. The supercritical carbon dioxide power cycle system has the characteristics of high energy density, compact system structure, high cycle efficiency and the like, so that the application of the supercritical carbon dioxide power cycle system to the field of coal-fired power generation is expected to greatly improve the coal-fired power generation efficiency.
Although the recompression supercritical carbon dioxide brayton cycle has a high cycle efficiency, there is a problem in applying it directly to a pulverized coal boiler heat source. Different from the traditional steam Rankine cycle, the temperature of the working medium at the inlet of the supercritical carbon dioxide Brayton cycle boiler is higher, about 490 ℃, and the temperature of the flue gas at the inlet of the air preheater is about 375 ℃, which causes that the heat of the low-temperature flue gas at about 520-375 ℃ at the tail flue of the boiler cannot be utilized, thus causing the over-high temperature of the flue gas of the boiler, the reduction of the efficiency of the boiler and the lower power generation efficiency of the system, and the configuration of the supercritical carbon dioxide power cycle system needs to be further optimized.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system and an operation method thereof, which have the characteristics of reducing the exhaust gas temperature, improving the boiler efficiency and ensuring the higher thermal efficiency of the supercritical carbon dioxide circulation, so that the system has higher power generation efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
a three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system comprises a main compressor 1, wherein the output end of the main compressor 1 is sequentially connected with a low-temperature regenerator 2 and a medium-temperature regenerator 3, and the output end of the medium-temperature regenerator 3 is divided into a main loop and a shunt loop;
the main loop respectively comprises a high-temperature heat regenerator 4, a boiler economizer 5, an overheating air cooling wall 6, a low-temperature superheater 7, a high-temperature superheater 8, a high-pressure turbine 9, a reheating air cooling wall 10, a low-temperature reheater 11, a high-temperature reheater 12 and a low-pressure turbine 13, wherein the high-temperature heat regenerator 4 and the boiler economizer are connected with the output end of the medium-temperature heat regenerator 3;
the flow dividing loop comprises a first-stage medium-pressure turbine 16 connected with the output end of the medium-temperature heat regenerator 3, and the output end of the first-stage medium-pressure turbine 16 is sequentially connected with a flow dividing superheater 17 and a second-stage medium-pressure turbine 18;
the exhaust end of the output of the low-pressure turbine 13 is connected with the high-temperature heat regenerator 4, the output end of the high-temperature heat regenerator 4 is mixed with the exhaust end of the output of the second-stage medium-pressure turbine 18, and then the mixture is sequentially split into two paths after heat release of the medium-temperature heat regenerator 3 and the low-temperature heat regenerator 2, namely a main compression loop and a recompression loop, and the output end of the main compression loop is connected with the main compressor 1 through a precooler 15 to complete closed circulation; the recompression loop output is in communication with the cold side outlet of low temperature regenerator 2 via compressor 14.
The superheated air cooling wall 6, the reheating air cooling wall 10, the low-temperature superheater 7, the low-temperature reheater 11, the high-temperature superheater 8, the high-temperature reheater 12, the economizer 5, the shunt superheater 17 and the air preheater 19 are sequentially arranged from bottom to top to form the tower boiler.
The low-temperature heat regenerator 2, the medium-temperature heat regenerator 3 and the high-temperature heat regenerator 4 form a heat regeneration system.
The first stage intermediate pressure turbine 16, the bypass superheater 17 and the second stage intermediate pressure turbine 18 form an intermediate reheating system.
An operation method of a three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system comprises the following steps;
after the working medium is boosted by the main compressor 1, the working medium absorbs heat in the low-temperature heat regenerator 2 and the medium-temperature heat regenerator 3 in sequence and then is divided into two paths, namely a main loop and a shunt loop; the working medium of the main loop absorbs heat in a high-temperature heat regenerator 4, a boiler economizer 5, an overheating air cooling wall 6, a low-temperature superheater 7 and a high-temperature superheater 8 in sequence, the working medium enters a high-pressure turbine 9 to partially expand and do work after the temperature rises, the working medium absorbs heat in the reheating air cooling wall 10, a low-temperature reheater 11 and a high-temperature reheater 12 in sequence after the temperature and the pressure are both reduced, and the working medium enters a low-pressure turbine 13 to completely expand and do work after the temperature rises again; the working medium of the shunt loop partially expands and does work in the first-stage medium-pressure turbine 16, enters the shunt superheater 17 to absorb heat, and enters the second-stage medium-pressure turbine 18 to completely expand and do work after the temperature rises; the low-pressure turbine 13 exhausts heat in the high-temperature heat regenerator 4, then mixes with the second-stage medium-pressure turbine 18, and branches into two paths, namely a main compression loop and a recompression loop, after the heat is released in the medium-temperature heat regenerator 3 and the low-temperature heat regenerator 2 in sequence; after releasing heat in the precooler 15, the working medium of the main compression loop enters the main compressor 1 to complete closed circulation; the recompression loop working medium is mixed with the working medium at the cold side outlet of the low-temperature heat regenerator 2 after being boosted by a recompressor 14; the cold air is preheated in the air preheater 19 and then enters the furnace to assist combustion.
The working medium used by the system is supercritical carbon dioxide.
The invention has the beneficial effects that:
the invention 1 shunts part of high temperature working medium from the cold side outlet of the medium temperature heat regenerator, and after the working medium is reduced to lower temperature by the expansion of the first stage medium pressure turbine part, the heat of medium and low temperature flue gas is fully recovered by the shunting superheater, thereby reducing the flue gas temperature and improving the boiler efficiency.
2 the main flow working medium and the shunt working medium of the invention are expanded in a reheating mode in a segmented way, thus realizing higher cycle efficiency.
3 the heat source of the invention is a pulverized coal boiler, but is also applicable to other heat sources with wider temperature range, such as a solar chimney and the like.
4 the invention adopts a tower boiler, and other types of boilers such as pi-type boilers and the like are also used.
Drawings
FIG. 1 is a schematic diagram of a three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system comprises a main compressor 1, a recompressor 14, a precooler 15, a low-temperature reheater 2, an intermediate-temperature reheater 3, a high-temperature reheater 4, a high-pressure turbine 9, a low-pressure turbine 13, a first-stage intermediate-pressure turbine 16, a second-stage intermediate-pressure turbine 18, a superheated air cooling wall 6, a reheated air cooling wall 10, a low-temperature superheater 7, a low-temperature reheater 11, a high-temperature superheater 8, a high-temperature reheater 12, an economizer 5, a shunt superheater 17 and an air preheater 19; wherein the content of the first and second substances,
an outlet of a main compressor 1, an inlet and an outlet of a cold side of a low-temperature heat regenerator 2, an inlet and an outlet of a cold side of a medium-temperature heat regenerator 3, an inlet and an outlet of a high-temperature heat regenerator 4, an inlet and an outlet of an economizer 5, an inlet and an outlet of a superheated air cooling wall 6, an inlet and an outlet of a low-temperature superheater 7, an inlet and an outlet of a high-temperature superheater 8, an inlet and an outlet of a high-pressure turbine 9, an inlet and an outlet of a reheated air cooling wall 10, an inlet and an outlet of a low-temperature reheater 11, an inlet and an outlet of a high-temperature reheate; the outlet of the cold side of the medium temperature heat regenerator 3, the inlet and outlet of the first-stage medium pressure turbine 16, the inlet and outlet of the shunt superheater 17, the inlet and outlet of the second-stage medium pressure turbine 18 and the inlet of the hot side of the medium temperature heat regenerator 3 are communicated in sequence; the hot side outlet of the low-temperature regenerator 2, the inlet and the outlet of the recompressor 14 and the cold side outlet of the low-temperature regenerator 2 are communicated in sequence.
In a preferred embodiment of the present invention, the superheated air-cooled wall 6, the reheated air-cooled wall 10, the low-temperature superheater 7, the low-temperature reheater 11, the high-temperature superheater 8, the high-temperature reheater 12, the economizer 5, the bypass superheater 17, and the air preheater 19 are arranged in this order from bottom to top to form a tower boiler.
As a preferred embodiment of the present invention, the low-temperature regenerator 2, the medium-temperature regenerator 3, and the high-temperature regenerator 4 constitute a regenerative system.
As a preferred embodiment of the invention, the first stage intermediate pressure turbine 16, the bypass superheater 17 and the second stage intermediate pressure turbine 18 constitute an intermediate reheating system.
In a preferred embodiment of the present invention, the working fluid used in the system is supercritical carbon dioxide.
The system adopts a three-stage heat regenerator arrangement, a part of supercritical carbon dioxide working medium with higher temperature is shunted from a cold side outlet of a middle temperature heat regenerator 3, the supercritical carbon dioxide working medium is expanded and does work at a first stage medium pressure turbine 16 part firstly, then enters a boiler tail shunt superheater 17 for reheating, the temperature is increased and is completely expanded and does work at a second stage medium pressure turbine 18, the temperature is reduced and then is converged into a hot side inlet of the middle temperature heat regenerator 3, on one hand, the middle and low temperature flue gas heat at the tail part of the boiler is recovered, the boiler exhaust gas temperature is reduced, the boiler efficiency is improved, on the other; the invention has higher power generation efficiency and is also suitable for the field of power generation by taking the solar chimney as a heat source.
As shown in fig. 1, in the operation method of the three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system, after the pressure of a working medium is increased by a main compressor 1, the working medium absorbs heat in a low-temperature regenerator 2 and a medium-temperature regenerator 3 in sequence, and then is divided into two paths, namely a main loop and a shunt loop; the working medium of the main loop absorbs heat in a high-temperature heat regenerator 4, a boiler economizer 5, an overheating air cooling wall 6, a low-temperature superheater 7 and a high-temperature superheater 8 in sequence, the working medium enters a high-pressure turbine 9 to partially expand and do work after the temperature rises, the working medium absorbs heat in the reheating air cooling wall 10, a low-temperature reheater 11 and a high-temperature reheater 12 in sequence after the temperature and the pressure are both reduced, and the working medium enters a low-pressure turbine 13 to completely expand and do work after the temperature rises again; the working medium of the shunt loop partially expands and does work in the first-stage medium-pressure turbine 16, enters the shunt superheater 17 to absorb heat, and enters the second-stage medium-pressure turbine 18 to completely expand and do work after the temperature rises; the low-pressure turbine 13 exhausts heat in the high-temperature heat regenerator 4, then mixes with the second-stage medium-pressure turbine 18, and branches into two paths, namely a main compression loop and a recompression loop, after the heat is released in the medium-temperature heat regenerator 3 and the low-temperature heat regenerator 2 in sequence; after releasing heat in the precooler 15, the working medium of the main compression loop enters the main compressor 1 to complete closed circulation; the recompression loop working medium is mixed with the working medium at the cold side outlet of the low-temperature heat regenerator 2 after being boosted by a recompressor 14; the cold air is preheated in the air preheater 19 and then enters the furnace to assist combustion.
The temperature of the working medium at the outlet of the secondary compressor 14 is low, the temperature difference between the working medium and the medium-low temperature flue gas is large, and if the working medium is directly used for recovering the heat of the medium-low temperature flue gas, a large amount of irreversible loss can be caused. The temperature of the working medium at the outlet of the cold side of the high-temperature heat regenerator 4 is too high, the heat of the medium-low temperature flue gas cannot be recovered, and even if the working medium is completely expanded to do work, the temperature is still higher, and the heat of the medium-low temperature flue gas cannot be recovered. The medium temperature heat regenerator 3 is arranged to heat the working medium to a proper temperature, part of the working medium is shunted to enable the working medium to be partially expanded to do work, the temperature is reduced to recover the heat of medium and low temperature flue gas, so that the exhaust gas temperature is reduced, the boiler efficiency is improved, the power generation efficiency is improved, the reheated working medium can be continuously and completely expanded to do work, and the reheated working medium can be mixed with the working medium with the temperature close to the temperature of the hot side inlet of the medium temperature heat regenerator 3 after the temperature is.
Claims (6)
1. The three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system is characterized by comprising a main compressor (1), wherein the output end of the main compressor (1) is sequentially connected with a low-temperature regenerator (2) and a medium-temperature regenerator (3), and the output end of the medium-temperature regenerator (3) is divided into a main loop and a shunt loop;
the main loop comprises a high-temperature regenerator (4) and a boiler economizer (5) which are connected with the output end of a medium-temperature regenerator (3), an overheating air cooling wall (6), a low-temperature superheater (7), a high-temperature superheater (8), a high-pressure turbine (9), a reheating air cooling wall (10), a low-temperature reheater (11), a high-temperature reheater (12) and a low-pressure turbine (13) respectively;
the flow dividing loop comprises a first-stage medium-pressure turbine (16) connected with the output end of the medium-temperature heat regenerator (3), and the output end of the first-stage medium-pressure turbine (16) is sequentially connected with a flow dividing superheater (17) and a second-stage medium-pressure turbine (18);
the exhaust end of the output of the low-pressure turbine (13) is connected with the high-temperature heat regenerator (4), the output end of the high-temperature heat regenerator (4) is mixed with the exhaust end of the output of the second-stage medium-pressure turbine (18), and then the mixture is divided into two paths, namely a main compression loop and a recompression loop, after heat release of the medium-temperature heat regenerator (3) and the low-temperature heat regenerator (2) in sequence, the output end of the main compression loop is connected with the main compressor (1) through a precooler (15), and closed circulation is completed; the output end of the recompression loop is communicated with a cold side outlet of the low-temperature regenerator (2) through a compressor (14).
2. The three-level regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system according to claim 1, wherein the hot gas cooling wall (6), the reheating gas cooling wall (10), the low-temperature superheater (7), the low-temperature reheater (11), the high-temperature superheater (8), the high-temperature reheater (12), the economizer (5), the shunt superheater (17) and the air preheater (19) are sequentially arranged from bottom to top to form a tower boiler.
3. The three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system according to claim 1, wherein the low-temperature regenerator (2), the medium-temperature regenerator (3) and the high-temperature regenerator (4) form a regenerative system.
4. The three-stage regenerative intermediate reheat supercritical carbon dioxide coal-fired power generation system of claim 1, wherein the first stage intermediate pressure turbine (16), the bypass superheater (17) and the second stage intermediate pressure turbine (18) comprise an intermediate reheat system.
5. An operation method of a three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system is characterized by comprising the following steps;
after the pressure of the working medium is increased by the main compressor (1), the working medium absorbs heat in the low-temperature heat regenerator (2) and the medium-temperature heat regenerator (3) in sequence and then is divided into two paths, namely a main loop and a shunt loop; the main loop working medium absorbs heat in a high-temperature regenerator (4), a boiler economizer (5), an overheating air cooling wall (6), a low-temperature superheater (7) and a high-temperature superheater (8) in sequence, the working medium enters a high-pressure turbine (9) to partially expand to do work after the temperature rises, the working medium absorbs heat in a reheating air cooling wall (10), a low-temperature reheater (11) and a high-temperature reheater (12) in sequence after the temperature and the pressure are both reduced, and the working medium enters a low-pressure turbine (13) to completely expand to do work after the temperature rises again; the working medium of the shunt loop enters a shunt superheater (17) to absorb heat after being partially expanded and does work in a first-stage medium-pressure turbine (16), and enters a second-stage medium-pressure turbine (18) to be fully expanded and do work after the temperature is increased; the exhaust gas of the low-pressure turbine (13) is mixed with the exhaust gas of the second-stage medium-pressure turbine (18) after being released in the high-temperature heat regenerator (4), and is divided into two paths, namely a main compression loop and a recompression loop, after being released in the medium-temperature heat regenerator (3) and the low-temperature heat regenerator (2) in sequence; after releasing heat in the precooler (15), the working medium of the main compression loop enters the main compressor (1) to complete closed circulation; the recompression loop working medium is boosted by a recompressor (14) and then mixed with the working medium at the cold side outlet of the low-temperature heat regenerator (2); the cold air enters the hearth for auxiliary combustion after being preheated in the air preheater (19).
6. The operation method of the three-stage regenerative intermediate reheating supercritical carbon dioxide coal-fired power generation system according to claim 5, wherein the working medium used by the system is supercritical carbon dioxide.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623039A (en) * | 2021-09-17 | 2021-11-09 | 西安热工研究院有限公司 | Air-carbon dioxide combined cycle power generation system and method |
| CN114687824A (en) * | 2022-03-31 | 2022-07-01 | 西安交通大学 | Supercritical carbon dioxide circulating system and method suitable for regulating and controlling temperature of villiaumite high-temperature reactor |
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2020
- 2020-03-11 CN CN202010164747.6A patent/CN111237734A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623039A (en) * | 2021-09-17 | 2021-11-09 | 西安热工研究院有限公司 | Air-carbon dioxide combined cycle power generation system and method |
| CN114687824A (en) * | 2022-03-31 | 2022-07-01 | 西安交通大学 | Supercritical carbon dioxide circulating system and method suitable for regulating and controlling temperature of villiaumite high-temperature reactor |
| CN114687824B (en) * | 2022-03-31 | 2023-03-21 | 西安交通大学 | Supercritical carbon dioxide circulating system and method suitable for regulating and controlling temperature of villiaumite high-temperature reactor |
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