CN106285805B - A kind of coal base supercritical carbon dioxide Brayton cycle electricity generation system of intermediate preheating - Google Patents
A kind of coal base supercritical carbon dioxide Brayton cycle electricity generation system of intermediate preheating Download PDFInfo
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- CN106285805B CN106285805B CN201610653896.2A CN201610653896A CN106285805B CN 106285805 B CN106285805 B CN 106285805B CN 201610653896 A CN201610653896 A CN 201610653896A CN 106285805 B CN106285805 B CN 106285805B
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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
- 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
-
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a kind of coal base supercritical carbon dioxide Brayton cycle electricity generation systems of intermediate preheating, the system is the supercritical carbon dioxide electricity generation system of enclosed indirectly heat, including main compressor, low pressure turbine, generator, forecooler, cryogenic regenerator, high temperature regenerator, boiler, high pressure turbine, recompression machine and mixer.Wherein boiler includes main working medium radiation heating-surface, reheating working medium radiation heating-surface, high temperature superheater, high temperature reheater, low-temperature reheater, low temperature superheater, intermediate preheater and air preheater again.The present invention passes through after the low-temperature reheater of boiler back end ductwork, low temperature superheater, intermediate preheater is arranged before air preheater, while the working medium after to mixer, before high temperature regenerator cold side input port preheats, the effective waste heat that boiler back end ductwork is utilized, exhaust gas temperature is reduced, improves the generating efficiency of boiler thermal efficiency and whole system.
Description
Technical field
The invention belongs to the efficient field of thermal power of supercritical carbon dioxide, and in particular to a kind of coal base of intermediate preheating surpasses
Critical carbon dioxide Brayton cycle electricity generation system.
Background technology
The height of generating set efficiency suffers from the development and environmental protection of national economy great influence, the storage of China's energy
Standby composition feature determines that Thermal generation unit is still the main force of China's power industry in coming few decades, therefore, carries
The efficiency of high Thermal generation unit is particularly important in China.The raising Thermal generation unit efficiency generally acknowledged in the world at present
Two mainstream technology routes are 700 DEG C of generation technologies and supercritical carbon dioxide Brayton cycle generation technology.700 DEG C of power generation skills
Art refers to that the main steam condition by traditional steam Rankine cycle generating set is improved to 700 DEG C, can be by the generating efficiency of unit
It improves to 50% or so.700 DEG C of generation technologies are a kind of methods for improving efficiency of generating unit the most direct, still, at present
700 DEG C of high-temperature alloy material development difficulties are big, of high cost, and problem of materials becomes the maximum bottleneck of 700 DEG C of generation technologies.In order to
The technical bottleneck in terms of material is avoided, sight is transferred to the new type power circulatory system by scholars one after another, to realize power generation
The promotion of efficiency.By a large amount of early-stage study of scholars and demonstration, supercritical carbon dioxide Bretton is generally believed at present
The circulatory system is the new concept advanced power systems of great potential.This is mainly due to supercritical carbon dioxides to have energy density
Greatly, the features such as heat transfer efficiency is high, supercritical carbon dioxide Brayton cycle efficient power generation system can be in 620 DEG C of temperature ranges
Reach the efficiency of 700 DEG C of conventional steam Rankine cycle, do not need to novel high temperature alloy of redeveloping, and equipment size is less than with ginseng
Several steam units, economy are very good.
But supercritical carbon dioxide Brayton cycle efficient power generation system is as a kind of novel advanced electricity generation system,
Still some problems have to be solved.For example, the supercritical carbon dioxide Brayton cycle and biography of the conventional recompression containing shunting
Unite structure boiler directly in conjunction with and it is improper.Due to carbon dioxide and the difference of water physical property, carbon dioxide Brayton cycle with
The electricity generating principle of steam Rankine cycle also has notable difference, in coal base supercritical carbon dioxide Brayton cycle electricity generation system,
The temperature of carbon dioxide boiler inlet working medium is higher by 100-200 DEG C than same parameter steam boiler, it means that when 600 DEG C of grades
When supercritical carbon dioxide boiler still uses the structure type of conventional supercritical fluid steam boiler, along the afterbody pair in flue gas direction
Temperature of Working can reach 500-550 DEG C in stream heating surface, and the flue-gas temperature at the convection heating surface can then be up to 600 DEG C or more,
And the more rational smoke inlet temperature of air preheater after the heating surface should be 400 DEG C, which results in 600 DEG C -400 DEG C
This partial fume waste heat can not utilize, boiler thermal efficiency is low, has seriously affected the generating efficiency of unit, in addition, excessively high cigarette
Temperature degree can cause the damage of air preheater and denitration device can not work normally.It is therefore proposed that a kind of coal-burning boiler and dioxy
Change the electricity generation system that carbon Bretton loop optimization combines seem very it is necessary to.
However through investigation it is found that introducing supercritical carbon dioxide Brayton cycle in open achievement domestic and international at present and patent
It applies the content in coal-fired power generation field seldom, more rarely has patent to be related to solving above-mentioned coal-burning boiler and supercritical carbon dioxide cloth
The method of thunder cycle matching problem.
Invention content
It is an object of the invention to solve the problems, such as coal-burning boiler and the matching of supercritical carbon dioxide Brayton cycle, provide
A kind of coal base supercritical carbon dioxide Brayton cycle electricity generation system of intermediate preheating, the system have effectively achieved coal-fired pot
Optimizing integration for stove and supercritical carbon dioxide Brayton cycle, takes full advantage of supercritical carbon dioxide boiler back end ductwork
Fume afterheat improves the thermal efficiency of boiler and the generating efficiency of system, while ensure that boiler tail air preheater and take off
The safe operation of nitre equipment.
In order to achieve the above objectives, the technical solution adopted in the present invention is：
The coal base supercritical carbon dioxide Brayton cycle electricity generation system of a kind of intermediate preheating, including main compressor, low pressure
Turbine, forecooler, cryogenic regenerator, high temperature regenerator, high pressure turbine, recompresses machine, mixer and as heat source at generator
Boiler, boiler include heating system, reheat system, intermediate preheater and air preheater；
Low pressure turbine is connected with main compressor, generator；
The lack of gas of low pressure turbine are followed by high temperature regenerator and cryogenic regenerator hot side, the working medium of cryogenic regenerator outlet
It is split into two-way in parallel, i.e., main compression circuit and recompression circuit；After the pre-cooled device of working medium of main compression circuit, main compressor
Into the cold side channel of cryogenic regenerator, mixer is entered after heating, recompresses the working medium in circuit after the boosting of recompression machine
Into mixer；Mixed working medium enters intermediate preheater with flowing into the cold of high temperature regenerator after flue gas heat exchange in mixer
Wing passage enters boiler after heating as Biological process；
Biological process enters high pressure turbine in boiler and does work after heating system heats to main Way of Refrigerant Design temperature, subsequently enter
The reheat system of boiler, by the hot gas again that is thermally formed of reheat system, reheating gas enters low pressure turbine acting, becomes after workmanship
Low pressure turbine lack of gas, so far working medium closed cycle is formd in whole system.
Further improve of the invention is that boiler is equipped with main working medium radiation heating-surface, again thermal technology successively along flue gas flow
Matter radiation heating-surface, high temperature superheater, high temperature reheater, low-temperature reheater, low temperature superheater, intermediate preheater (7-7) and sky
Air preheater；
Main working medium radiation heating-surface, low temperature superheater and high temperature superheater form heating system；
Reheating working medium radiation heating-surface, low-temperature reheater and high temperature reheater form reheat system.
Further improve of the invention is that, along flue gas flow, intermediate preheater is arranged in the low temperature of boiler back end ductwork
After reheater, low temperature superheater, before air preheater.
Of the invention further improve be, after being located at mixer along working medium flow intermediate preheater, high temperature regenerator
Before cold side input port.
Further improve of the invention is that high pressure turbine and recompression machine are coaxially arranged.
Further improve of the invention is that low pressure turbine, main compressor and generator coaxle are arranged.
Compared with prior art, the invention has the advantages that：The present invention is in super the facing of traditional shunting recompression
On boundary's carbon dioxide Brayton Cycle system, intermediate preheating technology is employed, particularly by intermediate preheater along boiler smoke air-flow
Journey be arranged in the low-temperature reheater of boiler back end ductwork, low temperature superheater after, before air preheater, be then arranged in along working medium flow
After the mixer of system, before the cold side input port of high temperature regenerator.By intermediate preheating technology, by the medium temperature after mixer converges
It is cold that high temperature regenerator is entered back into after high-pressure carbon dioxide (200 DEG C of grades) introducing intermediate preheater and boiler tail flue gas heat exchange
Side efficiently solves 600 DEG C of -400 DEG C of unserviceable problems of region heat of supercritical carbon dioxide boiler tail flue gas, carries
The high generating efficiency of the thermal efficiency of supercritical carbon dioxide boiler and entire electricity generation system, while also assure overcritical dioxy
Change the safe operation of air preheater and denitration device in carbon boiler back end ductwork.
Further, the present invention in intermediate preheater along boiler smoke flow arrangement boiler back end ductwork low temperature again
After hot device, low temperature superheater, before air preheater, after being then arranged in the mixer of system along working medium flow, high temperature regenerator
Before cold side input port.By this arrangement, the medium temperature high-pressure carbon dioxide (200 DEG C of grades) after mixer converges is introduced
High temperature regenerator cold side is entered back into after intermediate preheater and boiler tail flue gas heat exchange, efficiently solves overcritical titanium dioxide
600 DEG C of -400 DEG C of unserviceable problems of region heat of carbon boiler tail flue gas improve the heat of supercritical carbon dioxide boiler
The generating efficiency of efficiency and entire electricity generation system, while also assure air preheat in supercritical carbon dioxide boiler back end ductwork
The safe operation of device and denitration device.
Further, the present invention is coaxially arranged using high pressure turbine and recompression machine, low pressure turbine, main compressor and power generation
The coaxially arranged scheme of machine.The program has fully considered the characteristics of recompression machine wasted work is big in shunting recompression Brayton cycle,
Reasonably the work characteristics of the thermal technology again of boiler and two compressors is combined, high pressure turbine is realized and drives recompression
Machine works, and low pressure turbine drives the function of main compressor and generator operation.
Description of the drawings
Fig. 1 is the structure diagram of the present invention, in figure by taking π type boilers as an example, but is not limited to π type boilers.
Wherein, 1 is main compressor；2 be low pressure turbine；3 be generator；4 be forecooler；5 be cryogenic regenerator；6 be height
Warm regenerator；7 be boiler；7-1 is main working medium radiation heating-surface；7-2 is reheating working medium radiation heating-surface；7-3 is hyperthermia and superheating
Device；7-4 is high temperature reheater；7-5 is low-temperature reheater；7-6 is low temperature superheater；7-7 is intermediate preheater；7-8 is air
Preheater；8 be high pressure turbine；9 be recompression machine；10 be mixer.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples：
The present invention is illustrated by taking π type boilers as an example, but is not limited to π type boilers.
Referring to Fig. 1, intermediate preheating moulded coal base overcritical dioxy of the invention for the recompression containing shunting of enclosed indirectly heat
Change carbon Bretton cycle generating system, including main compressor 1, low pressure turbine 2, generator 3, forecooler 4, cryogenic regenerator 5, height
Warm regenerator 6, boiler 7, high pressure turbine 8, recompression machine 9 and mixer 10.
The heat source of the electricity generation system is 7 boilers, and boiler 7 includes heating system, reheat system, intermediate preheater 7-7 and sky
Air preheater 7-8；
Boiler 7 is equipped with main working medium radiation heating-surface 7-1, reheating working medium radiation heating-surface 7-2, high temperature successively along flue gas flow
Superheater 7-3, high temperature reheater 7-4, low-temperature reheater 7-5, low temperature superheater 7-6, intermediate preheater 7-7 and air preheater
7-8。
Wherein, main working medium radiation heating-surface 7-1, low temperature superheater 7-6 and high temperature superheater 7-3 form heating system；Again
Hot working fluid radiation heating-surface 7-2, low-temperature reheater 7-5 and high temperature reheater 7-4 form reheat system.
Boiler 7 has been sequentially arranged main working medium radiation heating-surface 7-1, low temperature superheater 7-6 and high temperature mistake along main working fluid journey
Hot device 7-3 has been sequentially arranged reheating working medium radiation heating-surface 7-2, low-temperature reheater 7-5 and high temperature reheating along reheating working medium flow
Device 7-4.
Working medium flow in system is：The lack of gas of low pressure turbine 2 are followed by 5 heat of high temperature regenerator 6 and cryogenic regenerator
Cold side working medium is heated in side, and the working medium that cryogenic regenerator 5 exports is split into two-way in parallel, i.e., main compression circuit and presses again
The working medium in retraction road, main compression circuit and recompression circuit is converged in mixer 10.Main compression circuit includes forecooler 4, main pressure
The cold side channel of contracting machine 1 and cryogenic regenerator 5；The working medium of main compression circuit is released waste heat to environment in forecooler 4, is passed through after
Main compressor 1 enters the cold side channel of cryogenic regenerator 5 after boosting, mixer 10 is entered after heating；Recompression circuit only includes
Recompression machine 9, the working medium for recompressing circuit are then directly over entering mixer 10 after recompression machine 9 boosts.In mixer 10
Mixed working medium enters intermediate preheater 7-7 with flowing into the cold side channel of high temperature regenerator 6, conduct after heating after flue gas heat exchange
Biological process enters boiler 7.Biological process is in boiler 7 followed by main working medium radiation heating-surface 7-1, low temperature superheater 7-6 and height
Warm superheater 7-3 does work into high pressure turbine 8 after being heated to main Way of Refrigerant Design temperature, subsequently enters the reheat system of boiler 7,
Hot gas again, then hot gas are thermally formed by reheating working medium radiation heating-surface 7-2, low-temperature reheater 7-5 and high temperature reheater 7-4
It does work into low pressure turbine 2, becomes 2 lack of gas of low pressure turbine after workmanship, so far working medium forms closed cycle in whole system.
Particularly, in the electricity generation system, intermediate preheater 7-7 is along boiler smoke flow arrangement in boiler back end ductwork
After low-temperature reheater 7-5, low temperature superheater 7-6, before air preheater 7-8, the mixer of system is then arranged in along working medium flow
After 10, before the cold side input port of high temperature regenerator 6.By this arrangement, by the medium temperature high pressure two after mixer 10 converges
200 DEG C of grades of carbonoxide enter back into 6 cold side of high temperature regenerator after introducing intermediate preheater 7-7 and boiler tail flue gas heat exchange, have
It solves 600 DEG C of -400 DEG C of unserviceable problems of region heat of supercritical carbon dioxide boiler tail flue gas to effect, improves
The generating efficiency of the thermal efficiency of supercritical carbon dioxide boiler and entire electricity generation system, while also assure supercritical carbon dioxide
The safe operation of air preheater 7-8 and denitration device in boiler back end ductwork.
In addition, the present invention is coaxially arranged using high pressure turbine 8 and recompression machine 9, low pressure turbine 2, main compressor 1 and power generation
The coaxially arranged scheme of machine 3；And low pressure turbine 2 is connected with generator 3.The program has fully considered that shunting recompression Bretton follows
The characteristics of 9 wasted work of machine is big is recompressed in ring, reasonably ties the work characteristics of the thermal technology again of boiler 7 and two compressors
It closes, realizes high pressure turbine 8 and recompression machine 9 is driven to work, low pressure turbine 2 drives 3 work work of main compressor 1 and generator
Energy.
Above-described specific embodiment has carried out the purpose of the present invention, technical solution and advantageous effect further
It is described in detail, it should be understood that the foregoing is merely the specific embodiment of the present invention, is not limited to this hair
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection domain within.
Claims (2)
1. a kind of coal base supercritical carbon dioxide Brayton cycle electricity generation system of intermediate preheating, it is characterised in that：Including main pressure
Contracting machine (1), low pressure turbine (2), generator (3), forecooler (4), cryogenic regenerator (5), high temperature regenerator (6), high pressure turbine
(8), recompression machine (9), mixer (10) and the boiler (7) as heat source, boiler (7) including heating system, reheat system, in
Between preheater (7-7) and air preheater (7-8)；
Low pressure turbine (2) is connected with main compressor (1), generator (3)；
The lack of gas of low pressure turbine (2) add cold side working medium followed by high temperature regenerator (6) and cryogenic regenerator (5) hot side
Heat, the working medium of cryogenic regenerator (5) hot side outlet are split into two-way in parallel, i.e., main compression circuit and recompression circuit；Main pressure
The pre-cooled device of working medium (4), the main compressor (1) on retraction road enter the cold side channel of cryogenic regenerator (5) afterwards, enter after heating mixed
Clutch (10), the working medium for recompressing circuit enter mixer (10) after recompression machine (9) boosting；It main compression circuit and presses again
Medium temperature high-pressure carbon dioxide of the working medium on retraction road after mixer (10) converges enters intermediate preheater (7-7) and boiler tail
The cold side channel of high temperature regenerator (6) is flowed into after flue gas heat exchange, enters boiler (7) as Biological process after heating；
Biological process enters high pressure turbine (8) after boiler (7) interior heating system heats to main Way of Refrigerant Design temperature and does work, with laggard
Enter the reheat system of boiler (7), by the hot gas again that is thermally formed of reheat system, reheating gas enters low pressure turbine (2) acting, does
Become low pressure turbine (2) lack of gas after work, so far working medium forms closed cycle in whole system；
Boiler (7) is equipped with main working medium radiation heating-surface (7-1), reheating working medium radiation heating-surface (7-2), height along flue gas flow successively
Warm superheater (7-3), high temperature reheater (7-4), low-temperature reheater (7-5), low temperature superheater (7-6), intermediate preheater (7-7)
With air preheater (7-8)；
Main working medium radiation heating-surface (7-1), low temperature superheater (7-6) and high temperature superheater (7-3) form heating system；
Reheating working medium radiation heating-surface (7-2), low-temperature reheater (7-5) and high temperature reheater (7-4) form reheat system；
Along flue gas flow, intermediate preheater (7-7) is arranged in low-temperature reheater (7-5), the low temperature superheater of boiler back end ductwork
(7-6) afterwards, before air preheater (7-8)；
Along working medium flow intermediate preheater (7-7) positioned at mixer (10) afterwards, before the cold side input port of high temperature regenerator (6)；
High pressure turbine (8) and recompression machine (9) are coaxially arranged.
2. a kind of coal base supercritical carbon dioxide Brayton cycle electricity generation system of intermediate preheating according to claim 1,
It is characterized in that：Low pressure turbine (2), main compressor (1) and generator (3) are coaxially arranged.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107387178A (en) * | 2017-07-13 | 2017-11-24 | 上海发电设备成套设计研究院有限责任公司 | A kind of co-generation unit based on supercritical carbon dioxide closed cycle |
| CN109555569B (en) * | 2018-12-25 | 2020-06-02 | 西安交通大学 | Supercritical carbon dioxide circulation cold end waste heat recovery power generation system and operation method |
| CN109611168A (en) * | 2019-01-15 | 2019-04-12 | 西安热工研究院有限公司 | A kind of supercritical carbon dioxide electricity generation system of turbine high position arrangement |
| CN110836131B (en) * | 2019-11-05 | 2021-03-23 | 西安交通大学 | Supercritical carbon dioxide recompression circulating turbine mechanical system |
| CN114655923B (en) * | 2022-04-22 | 2023-05-30 | 西安热工研究院有限公司 | System and method for cogeneration of hydrogen and electricity of coal-fired boiler |
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| CN104728823A (en) * | 2015-03-17 | 2015-06-24 | 西安热工研究院有限公司 | Novel supercritical carbon dioxide coal-fired boiler |
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| CN104728823A (en) * | 2015-03-17 | 2015-06-24 | 西安热工研究院有限公司 | Novel supercritical carbon dioxide coal-fired boiler |
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