CN206831480U - A kind of supercritical carbon dioxide CFBB heating system - Google Patents
A kind of supercritical carbon dioxide CFBB heating system Download PDFInfo
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- CN206831480U CN206831480U CN201720757382.1U CN201720757382U CN206831480U CN 206831480 U CN206831480 U CN 206831480U CN 201720757382 U CN201720757382 U CN 201720757382U CN 206831480 U CN206831480 U CN 206831480U
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- superheater
- carbon dioxide
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a kind of supercritical carbon dioxide CFBB heating system, including boiler, spirally-wound tubes superheater, separator, flue and convection superheater, wherein, the spirally-wound tubes superheater is arranged on inside the burner hearth of boiler, it is spirally-wound tubes structure, and bolt pipeloop provides supercritical carbon dioxide stream passage；The convection superheater is arranged on the inside of flue, there is provided supercritical carbon dioxide stream passage；The upper end of burner hearth and the inlet communication of separator, the exhanst gas outlet of separator are connected with one end of the flue, and the solid particle outlet of separator is connected by returning charge valve with the burner hearth of boiler；Spirally-wound tubes superheater is set in parallel or series with convection superheater.
Description
Technical field
The utility model belongs to efficient thermal power generating technology field, and in particular to a kind of supercritical carbon dioxide is ciculation fluidized
Bed boiler heating system.
Background technology
Power cycle is core and the basis of thermal power generation unit, and it is the eternal mesh that power industry is pursued to improve cycle efficieny
Mark.Conventional fired power generating unit uses steam Rankine cycle more, and the key determinant of its efficiency is main steam condition, most advanced at present
700 DEG C of extra-supercritical unit efficiency theories on can break through 50%.However, being restricted by current material and technique, steam parameter carries
Height has its limit and with high costs.How on the basis of state of the art, the innovation and breakthrough of power cycle technology are realized, it is right
In China's energy sustainable development and clean transition there is important reality and far-reaching significance.
In recent years, domestic and international energy source and power circle has carried out numerous studies work in new type power cycle art, wherein and with
Supercritical carbon dioxide Brayton cycle technology attention.The technology can reach at a lower temperature to be followed with steam Rankine
The ring identical thermal efficiency, unit floor space is small, than low cost and realizes Resources of Carbon Dioxide and utilizes, and has hair well
Open up potentiality.However, in terms of presently disclosed document, the main face of research to supercritical carbon dioxide Brayton cycle electricity generation system
To nuclear energy, solar energy and industrial exhaust heat, rarely has the report of the thermal power generation system for the solid energy such as coal, biomass.I
The energy resource structure of state is based on coal, while China is biomass resource big country again, thus develops supercritical carbon dioxide Bretton
Circulation thermal power generation system tallies with the national condition, wide market.
Boiler is one of critical equipment of supercritical carbon dioxide Brayton cycle thermal power generation system.For low capacity (<
100MW) thermal power generation system, supercritical carbon dioxide Brayton cycle are adapted to use the recompression circulation process without reheating, this
Under the conditions of, supercritical carbon dioxide boiler faces many obstacles in the design：First, carbon dioxide is in a supercritical state, inhales
Thermal process is not undergone phase transition, and economizer need not be arranged in back-end ductwork；Secondly, a large amount of backheats are circulated and use low-pressure ratio, it is super to face
Boundary's carbon dioxide temperature rise in boiler small (about 150 DEG C) but flow are far above with steam boiler under thermic load so that superheater cloth
Put difficulty increase；Again, supercritical carbon dioxide temperature into boiler it is higher (>400 DEG C), and specific heat is less than vapor, makes
The easy overtemperature of radiation heating-surface tube wall in burner hearth is obtained, also make it that exhaust gas temperature is higher.
Utility model content
For technical problem present in above-mentioned prior art, the purpose of this utility model is to provide a kind of overcritical dioxy
Change carbon cycle fluidized-bed combustion boiler heating system and heating means.The boiler heating system can be used for the overcritical titanium dioxide of low capacity
Carbon Brayton cycle thermal power generation system, have higher thermal efficiency, the advantage compared with low-nitrogen oxide discharging, and can overcome burner hearth by
The problems such as hot face overtemperature of tube wall and heating surface arrangement space deficiency.
In order to solve problem above, the technical solution of the utility model is：
A kind of supercritical carbon dioxide CFBB heating system, including boiler, spirally-wound tubes superheater, separation
Device, flue and convection superheater, wherein, the spirally-wound tubes superheater is arranged on inside the burner hearth of boiler, and it is spirally-wound tubes
Structure, bolt pipeloop provide supercritical carbon dioxide stream passage；
The convection superheater is arranged on the inside of flue, there is provided supercritical carbon dioxide stream passage；
The upper end of burner hearth and the inlet communication of separator, the exhanst gas outlet of separator connect with one end of the flue, point
Solid particle outlet from device is connected by returning charge valve with the burner hearth of boiler；
Spirally-wound tubes superheater is set in parallel or series with convection superheater.
Superheater in burner hearth replaces traditional water wall structure using spirally-wound tubes structure, in parallel with convection superheater
When, by adjusting the flow-rate ratio of the supercritical carbon dioxide entered in spirally-wound tubes superheater and convection superheater, can effectively keep away
Exempt from heat-transfer surface cloth caused by convection superheater flue gas exit temperature is too high and stream of supercritical carbon dioxide amount is big, the inlet and outlet temperature difference is small
Problem is put, while can also save economizer to make process simplification.
When spirally-wound tubes superheater is connected with convection superheater, low temperature supercritical carbon dioxide initially enters spirally-wound tubes mistake
Hot device, furnace heating surface mean temperature is low, can reduce the overtemperature of tube wall risk that its non-phase-change heat-exchange is brought.
Convection superheater is used simultaneously, supercritical carbon dioxide is heated using the flue gas in flue, adds heating surface,
Can solve the problems, such as burner hearth internal heating surface arrangement space deficiency.
Gas solid separation is carried out to flue gas using separator, and using solid particle to the overcritical dioxy in external reheater
Change carbon to be heated, reclaimed the heat of solid particle in flue gas, improved the utilization rate of energy.
Further, the separator is cyclone separator.
Cyclone separator is to utilize the equipment of solid particle or drop in centrifugal force separate air-flow.
Further, when spirally-wound tubes superheater and convection superheater are connected, it is provided with the downstream of convection superheater
Economizer.
Further, the flow direction of the supercritical carbon dioxide in economizer is opposite with flue gas flow direction.
Further, the downstream of the economizer is provided with main air preheater.
Further, the downstream of the main air preheater is provided with secondary air preheater.
Further, following again of being connected with the furnace chamber of boiler is provided between the main air preheater and economizer
Annular smoke flue, blower fan is provided with recirculating gas duct.
The partial fume in flue is introduced in the furnace chamber of boiler by blower fan, partial fume is recycled, can reduce
The concentration of oxygen in burner hearth, it can effectively reduce the generation of nitrogen oxides.The flow increase of tail flue gas simultaneously, is advantageous to strengthen
Fume side exchanges heat, and reduces convection heating surface heat exchange area.
The side heated using the supercritical carbon dioxide CFBB heating system to supercritical carbon dioxide
Method, comprise the following steps：
Spirally-wound tubes superheater and convection superheater are worked using mode in parallel or series：
When in parallel：Supercritical carbon dioxide is divided into two-way, respectively enters spirally-wound tubes superheater and convection superheater, enters
The supercritical carbon dioxide all the way of spirally-wound tubes superheater exchanges heat with the mixture of flue gas and solid particle in burner hearth, into convection current
The supercritical carbon dioxide all the way of superheater and the flue gas heat exchange in flue, two-way supercritical carbon dioxide overheat in spirally-wound tubes
Turbine is sent into the outlet of device and convection superheater after converging.
During series connection：Supercritical carbon dioxide sequentially enters spirally-wound tubes superheater and convection superheater is exchanged heat, convection current
The supercritical carbon dioxide of superheater outlet is sent into turbine.
The supercritical carbon dioxide of turbine outlet sequentially enters high temperature regenerator and the low-pressure side of cryogenic regenerator is cooled,
The supercritical carbon dioxide of high temperature regenerator outlet is divided into two-way, enters main compressor after cooler further cools down all the way,
Enter cryogenic regenerator high-pressure side after compression, another way enters presses compressor to be compressed again, and two-way converges before high temperature regenerator
It is heated after conjunction into high temperature regenerator high-pressure side.Supercritical carbon dioxide into economizer is drawn after main compressor, warp
Converge after economizer heating with the supercritical carbon dioxide of high temperature regenerator outlet and be sent into spirally-wound tubes superheater and convection current overheat
In device, a circulation is completed.
Further, supercritical carbon dioxide total flow is accounted for into the stream of supercritical carbon dioxide amount of spirally-wound tubes superheater
55-65%.
Further, the above method also includes for the flue gas partial in economizer downstream being introduced into the step recycled in boiler
Suddenly, the exhaust gas volumn for introducing boiler is the 15-20% of amount of flue gas emission.
Further, the supercritical carbon dioxide working medium import of spirally-wound tubes superheater is arranged in burner hearth bottom, and it flows
Direction is arranged as following current with flow of flue gas direction；
Supercritical carbon dioxide Working fluid flow direction is arranged as adverse current with flow of flue gas direction in convection superheater.
The beneficial effects of the utility model are：
1) CFBB pattern is used, temperature maintains 850-900 DEG C in burner hearth, reduces radiant heat transfer amount.Stove
Supercritical carbon dioxide heating surface replaces traditional water wall structure using spirally-wound tubes structure in thorax, and uses and afterbody convection current
Heating surface parallel way, furnace heating surface are heated evenly, easy to adjust during boiler part load operation, can effectively avoid being faced by super
The overtemperature of tube wall problem that carbon dioxide inlet temperature high and non-phase-change heat-exchange in boundary's is brought, while air preheating temperature is up to 400 DEG C
More than, be advantageous to use high ash content, low heat value inferior fuel；
2) flue gas recirculation is used, oxygen concentration in burner hearth is reduced, can effectively reduce NO_x formation, while back-end ductwork
Flow increase, be advantageous to strengthen fume side heat exchange, reduce convection heating surface heat exchange area；
3) device flow is simple, compact-sized, device integration is high, can save floor space, reduces process pipelines.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is the structural representation of the utility model embodiment 1；
Fig. 2 is the structural representation of the utility model embodiment 2.
Wherein：1st, burner hearth, 2, spirally-wound tubes superheater, 2a, spirally-wound tubes superheater working medium import, 2b, spirally-wound tubes mistake
Hot device sender property outlet, 3, cyclone separator, 4, returning charge valve, 5, convection superheater, 5a, convection superheater working medium import, 5b, convection current
Superheater sender property outlet, 6, main air preheater, 7, secondary air preheater, 8, recirculating gas duct, 9, recirculation blower,
10th, economizer is shunted.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Embodiment 1
As shown in figure 1, a kind of small-sized supercritical carbon dioxide circulating fluidized bed boiler device, including boiler furnace 1, spiral
Pipeloop superheater 2, cyclone separator 3, returning charge valve 4, convection superheater 5, main air preheater 6, secondary air preheater 7,
Recirculating gas duct 8, recirculation blower 9 and connecting pipe.
Half buried tube type spirally-wound tubes superheater 2 of arrangement, spirally-wound tubes superheater working medium import 2a in the furnace wall of boiler furnace 1
Lower furnace portion is arranged in, spiral superheater sender property outlet 2b is arranged in upper furnace, and the heat exchanger tube number of turns is enclosed for 1.5-2.Boiler
The top exhanst gas outlet of burner hearth 1 and the inlet communication of cyclone separator 3, the bottom solid particle outlet of cyclone separator 3 are entered with returning charge valve 4
Mouth connection, the outlet of returning charge valve 4 connects with the bottom of boiler furnace 1, to form solid particle circulation canal.The top of cyclone separator 3
Exhanst gas outlet is connected with boiler back end ductwork, and convection superheater 5, secondary flue gas preheater 6 and one are sequentially arranged in back-end ductwork
Secondary smoke-gas preheater 7.Flue gas recycled extraction point is arranged in the afterbody cigarette between convection superheater 5 and secondary flue gas preheater 6
On road, 1 wind inlets of burner hearth or secondary air inlet, flue gas recycled amount are sent into by recirculating gas duct 8 and recirculation blower 9
For the 15-20% of amount of theoretical flue gas.
Spirally-wound tubes superheater 2 and convection superheater 5 use parallel way, spirally-wound tubes superheater working medium import 2a with it is right
Superheater working medium import 5a connections are flowed, spirally-wound tubes superheater sender property outlet 2b is connected with convection superheater sender property outlet 5b, entered
The supercritical carbon dioxide working medium for entering boiler is divided into two-way, and the distribution of two-way working medium flow is adjusted by regulating valve 2c and regulating valve 5c
Section.
The spirally-wound tubes superheater working medium and flow of flue gas mode are downflow type, convection superheater working medium and flow of flue gas
Mode is reverse-flow.The ratio that the working medium into spirally-wound tubes superheater 2 accounts for total flow is 60%.
Embodiment 2
As shown in Fig. 2 a kind of small-sized supercritical carbon dioxide circulating fluidized bed boiler device, including boiler furnace 1, spiral
Pipeloop superheater 2, cyclone separator 3, returning charge valve 4, convection superheater 5, secondary air preheater 6, main air preheater 7,
Recirculating gas duct 8, recirculation blower 9, shunting economizer 10 and connecting pipe.
The present embodiment and the difference of embodiment 1 are：
Spirally-wound tubes superheater uses series system, spirally-wound tubes superheater sender property outlet 2b and convection current with convection superheater
Superheater working medium 5a is connected, and the supercritical carbon dioxide working medium into boiler passes sequentially through spirally-wound tubes superheater 2 and to flowing through
Hot device 5.Arrangement shunting economizer 10 between convection superheater 5 and secondary smoke preheater 6, flue gas recycled pumping in back-end ductwork
Point is arranged on the flue between shunting economizer 10 and secondary air preheater 6.
Spirally-wound tubes superheater and convection superheater are worked using mode in parallel or series：
When in parallel：Supercritical carbon dioxide is divided into two-way, respectively enters spirally-wound tubes superheater and convection superheater, enters
The supercritical carbon dioxide all the way of spirally-wound tubes superheater exchanges heat with the mixture of flue gas and solid particle in burner hearth, into convection current
The supercritical carbon dioxide all the way of superheater and the flue gas heat exchange in flue, two-way supercritical carbon dioxide overheat in spirally-wound tubes
Turbine is sent into the outlet of device and convection superheater after converging.
During series connection：Supercritical carbon dioxide sequentially enters spirally-wound tubes superheater and convection superheater is exchanged heat, convection current
The supercritical carbon dioxide of superheater outlet is sent into turbine.
The supercritical carbon dioxide of turbine outlet sequentially enters high temperature regenerator and the low-pressure side of cryogenic regenerator is cooled,
The supercritical carbon dioxide of high temperature regenerator outlet is divided into two-way, enters main compressor after cooler further cools down all the way,
Enter cryogenic regenerator high-pressure side after compression, another way enters presses compressor to be compressed again, and two-way converges before high temperature regenerator
It is heated after conjunction into high temperature regenerator high-pressure side.Supercritical carbon dioxide into economizer is drawn after main compressor, warp
Converge after economizer heating with the supercritical carbon dioxide of high temperature regenerator outlet and be sent into spirally-wound tubes superheater and convection current overheat
In device, a circulation is completed.
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (6)
- A kind of 1. supercritical carbon dioxide CFBB heating system, it is characterised in that：Including boiler, spirally-wound tubes mistake Hot device, separator, flue and convection superheater, wherein, the spirally-wound tubes superheater is arranged on inside the burner hearth of boiler, and it is Spirally-wound tubes structure, bolt pipeloop provide supercritical carbon dioxide stream passage；The convection superheater is arranged on the inside of flue, there is provided supercritical carbon dioxide stream passage；The upper end of burner hearth and the inlet communication of separator, the exhanst gas outlet of separator connect with one end of the flue, separator Solid particle outlet connected by returning charge valve with the burner hearth of boiler；Spirally-wound tubes superheater is set in parallel or series with convection superheater.
- 2. heating system according to claim 1, it is characterised in that：Spirally-wound tubes superheater and convection superheater series connection When, economizer is installed in the downstream of convection superheater.
- 3. heating system according to claim 2, it is characterised in that：The flow direction of supercritical carbon dioxide in economizer with Flue gas flow direction is opposite.
- 4. heating system according to claim 2, it is characterised in that：It is pre- that the downstream of the economizer is provided with main air Hot device.
- 5. heating system according to claim 4, it is characterised in that：The downstream of the main air preheater is provided with two Level air preheater.
- 6. heating system according to claim 4, it is characterised in that：Set between the main air preheater and economizer The recirculating gas duct connected with the furnace chamber of boiler is equipped with, blower fan is provided with recirculating gas duct.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720757382.1U CN206831480U (en) | 2017-06-27 | 2017-06-27 | A kind of supercritical carbon dioxide CFBB heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720757382.1U CN206831480U (en) | 2017-06-27 | 2017-06-27 | A kind of supercritical carbon dioxide CFBB heating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120642A (en) * | 2017-06-27 | 2017-09-01 | 山东大学 | A kind of supercritical carbon dioxide CFBB heating system and heating means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120642A (en) * | 2017-06-27 | 2017-09-01 | 山东大学 | A kind of supercritical carbon dioxide CFBB heating system and heating means |
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