CN205332163U - High -efficient power generation system of coal -based super supercritical carbon dioxide brayton cycle double split flow - Google Patents
High -efficient power generation system of coal -based super supercritical carbon dioxide brayton cycle double split flow Download PDFInfo
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- CN205332163U CN205332163U CN201620053790.4U CN201620053790U CN205332163U CN 205332163 U CN205332163 U CN 205332163U CN 201620053790 U CN201620053790 U CN 201620053790U CN 205332163 U CN205332163 U CN 205332163U
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Abstract
The utility model discloses a high -efficient power generation system of coal -based super supercritical carbon dioxide brayton cycle double split flow, including the low temperature regenerator, the precooler, the main compressor, the recompression machine, the high temperature regenerator, the boiler, the high pressure turbine, the low pressure turbine, boiler and generator, the combustion passage of the direction of flue gas circulation by consecutive expert is followed to the boiler, main heat transfer passageway and afterbody flue are formed, wherein, the direction that flows along the flue in the combustion passage is equipped with water -cooling wall and reheat water -cooling wall in proper order, direction along the flue gas circulation in the main heat transfer passageway is equipped with high temperature over heater and high -temperature reheater in proper order, direction along the flue gas circulation in the afterbody flue is equipped with the baffle in proper order, economizer and low -level (stack -gas) economizer, the both sides of baffle are equipped with cold reheat ware and low temperature superheater. The utility model discloses can realize optimizing integration of coal fired boiler and super supercritical carbon dioxide brayton cycle to the heat exchange efficiency of high temperature regenerator, the thermal efficiency of boiler and power generation system's efficiency is higher.
Description
Technical field
This utility model belongs to advanced efficiency power generation apparatus field, relates to a kind of coal-based supercritical carbon dioxide Brayton cycle double split flow efficient power generation system。
Background technology
Development and the environmental conservation of national economy are suffered from material impact by the height of generating set efficiency, and particularly in the China based on thermal power generation, the efficiency improving coal unit is just particularly important。But, for traditional generating set being energy conversion system with steam Rankine cycle, if improving generating efficiency to about 50%, then needing to be increased to main steam condition 700 DEG C, this means that needs to spend high economic cost and time cost to research and develop New Nickel based high-temperature alloy。In order to avoid the technical bottleneck of material aspect, sight is transferred to new type power blood circulation by scholars one after another, to realizing the lifting of generating efficiency。Through the substantial amounts of early-stage Study of scholars and demonstration, generally believe that supercritical carbon dioxide Brayton cycle is the new ideas advanced power systems of great potential at present。This has mainly due to supercritical carbon dioxide, and energy density is big, heat transfer efficiency high, supercritical carbon dioxide Brayton cycle efficient power generation system can reach the efficiency of conventional steam Rankine cycle 700 DEG C in 620 DEG C of temperature ranges, need not redevelop novel high temperature alloy, and equipment size is less than the steam unit of same parameter, economy is very good。
The composition feature of China's energy reserves determines Thermal generation unit and remains the main force of China's power industry in coming few decades, therefore, coal-based supercritical carbon dioxide Brayton cycle efficient power generation system tallies with the national condition very much, will have extraordinary development prospect in China。
But, conventional containing the supercritical carbon dioxide Brayton cycle of shunting recompression and the boiler of traditional structure directly in conjunction with and improper, topmost problem is embodied in following two aspects: first, in traditional supercritical carbon dioxide shunting recompression Brayton cycle, the cold side of high temperature regenerator is the same with hot side working medium flow, now cold side, hot side working medium physical property difference cause that high temperature regenerator hot junction heat transfer temperature difference is higher, the efficiency of high temperature regenerator still has room for promotion；Secondly, difference due to carbon dioxide and water physical property, and the difference of Brayton cycle and Rankine cycle, in coal-based supercritical carbon dioxide Brayton cycle electricity generation system, the temperature of carbon dioxide boiler inlet working medium is far above the steam boiler of same parameter, namely in economizer, the temperature of working medium will far above the steam boiler of same parameter, after this can cause economizer, flue-gas temperature before air preheater is too high (with 22MPa, the loop parameter of 600/600/32 DEG C is example, the temperature of carbon dioxide boiler inlet working medium is about 530 DEG C, after economizer, the temperature of flue gas is then up to 550 DEG C-650 DEG C, far above after same parameter steam boiler economizer 350～400 DEG C of cigarette temperature。), it is unfavorable for the reduction of the final exhaust gas temperature of boiler, and the normal operation of denitration device can be had a strong impact on。
Through investigation it can be seen that the conventional open achievement about supercritical carbon dioxide Brayton cycle electricity generation system and patent all exist the problems referred to above。Such as, the supercritical carbon dioxide Brayton cycle containing shunting recompression mentioned in patent " supercritical carbon dioxide turbine for solar energy equipment " (200710306179.3) exists for high temperature regenerator hot junction heat transfer temperature difference higher, the problem that high temperature regenerator heat exchange efficiency is relatively low。In the system containing multi-stage diffluence mentioned in patent " coal-based Novel supercritical working medium multi-stage diffluence reheat-type efficient power generation system " (201520152457.4), shunting working medium is all drawn from the hot-side channel of regenerator, and the mean specific heat of hot side carbon dioxide is less than the mean specific heat of cold side working medium, this can cause that the cold and hot side heat transfer temperature difference of high temperature regenerator and cryogenic regenerator all increases, and reduces the heat exchange efficiency of regenerator；And draw working medium from the hot side of regenerator and enter the boiler back end ductwork cooling-down effect to flue gas not as drawing the effective of working medium from the cold side of regenerator。
Utility model content
The purpose of this utility model is in that the shortcoming overcoming above-mentioned prior art, provide a kind of coal-based supercritical carbon dioxide Brayton cycle double split flow efficient power generation system, this system is capable of optimizing integration of coal-burning boiler and supercritical carbon dioxide Brayton cycle, and the efficiency of the thermal efficiency of the heat exchange efficiency of high temperature regenerator, boiler and electricity generation system is higher。
For reaching above-mentioned purpose, coal-based supercritical carbon dioxide Brayton cycle double split flow efficient power generation system described in the utility model includes cryogenic regenerator, precooler, main compressor, recompression machine, high temperature regenerator, boiler, high pressure turbine, low pressure turbine, boiler and electromotor；
Boiler forms along the direction that flue gas circulates by being sequentially connected logical burning gallery, main heat exchange passage and back-end ductwork, wherein, it is sequentially provided with water-cooling wall and reheating water-cooling wall along the direction of flue flowing in burning gallery, it is sequentially provided with high temperature superheater and high temperature reheater along the direction of flue gas circulation in main heat exchange passage, being sequentially provided with baffle plate, economizer and low-level (stack-gas) economizer along the direction of flue gas circulation in back-end ductwork, the both sides of baffle plate are provided with low-temperature reheater and low temperature superheater；
The weary gas outlet of the hot side of cryogenic regenerator is divided into two-way, wherein, the one pre-cooled device in tunnel is connected with the entrance of main compressor, the outlet of main compressor is connected with the cold side input port of cryogenic regenerator, another road is connected with the entrance of recompression machine, the outlet of recompression machine and the cold side outlet port of cryogenic regenerator are by being divided into two-way after pipeline pipe, wherein, one tunnel is connected with the cold side input port of high temperature regenerator, another road is connected with the entrance of shunting low-level (stack-gas) economizer, the outlet of high temperature regenerator cold side outlet port and shunting low-level (stack-gas) economizer is all connected with the entrance of economizer, the outlet of economizer is successively through the water-cooling wall of boiler, after low temperature superheater and high temperature superheater, the once gas entrance with high pressure turbine is connected, the weary gas outlet reheated water-cooling wall successively of high pressure turbine, after low-temperature reheater and high temperature reheater, the secondary gas entrance with low pressure turbine is connected, the weary gas outlet of low pressure turbine is connected with the weary gas entrance of the hot side of cryogenic regenerator through the hot side of high temperature regenerator, the axle that drives of electromotor is connected with the output shaft of low pressure turbine。
It is additionally provided with air preheater in described back-end ductwork。
This utility model has the advantages that
Coal-based supercritical carbon dioxide Brayton cycle double split flow efficient power generation system described in the utility model is in the course of the work, the back-end ductwork of boiler is provided with shunting low-level (stack-gas) economizer, the carbon dioxide of cryogenic regenerator cold side outlet port and the outlet of recompression machine is divided into two-way, wherein a road enters into high temperature regenerator, another road enters in shunting low-level (stack-gas) economizer, heat exchange is carried out again through the fume side with boiler, thus temperature working medium in regenerator section, effectively reduce the flue-gas temperature after supercritical carbon dioxide boiler economizer simultaneously, and then reduce the size of air preheater, effectively reduce exhaust gas temperature, improve boiler thermal output。In addition, it is necessary to illustrate, this utility model adopts diversion design again, making high temperature regenerator cold side working medium flow lower than hot side working medium flow, reducing the heat transfer temperature difference of the cold and hot side of high temperature regenerator, thus improving the heat exchange efficiency of high temperature regenerator。When concrete operations, then the shunt volume tapped suitably can regulate according to the flue-gas temperature that shunting low-level (stack-gas) economizer need to reduce, and reduces the heat loss due to exhaust gas of boiler, to reaching the boiler thermal output of optimum as far as possible。
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model。
Wherein, 1 for precooler, 2 be main compressor, 3 for recompression machine, 4 for cryogenic regenerator, 5 for high temperature regenerator, 6 for boiler, 7 for high pressure turbine, 8 for low pressure turbine, 9 for electromotor, 61 for water-cooling wall, 62 for reheating water-cooling wall, 63 for high temperature superheater, 64 for high temperature reheater, 65 for low-temperature reheater, 66 for low temperature superheater, 67 for economizer, 68 for shunting low-level (stack-gas) economizer, 69 be air preheater。
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in further detail:
With reference to Fig. 1, coal-based supercritical carbon dioxide Brayton cycle double split flow efficient power generation system described in the utility model includes cryogenic regenerator 4, precooler 1, main compressor 2, recompression machine 3, high temperature regenerator 5, boiler 6, high pressure turbine 7, low pressure turbine 8, boiler 6 and electromotor 9；Boiler 6 forms along the direction that flue gas circulates by being sequentially connected logical burning gallery, main heat exchange passage and back-end ductwork, wherein, it is sequentially provided with water-cooling wall 61 and reheating water-cooling wall 62 along the direction of flue flowing in burning gallery, it is sequentially provided with high temperature superheater 63 and high temperature reheater 64 along the direction of flue gas circulation in main heat exchange passage, being sequentially provided with baffle plate, economizer 67 and low-level (stack-gas) economizer 68 along the direction of flue gas circulation in back-end ductwork, the both sides of baffle plate are provided with low-temperature reheater 65 and low temperature superheater 66；The weary gas outlet of the hot side of cryogenic regenerator 4 is divided into two-way, wherein, the one pre-cooled device 1 in tunnel is connected with the entrance of main compressor 2, the outlet of main compressor 2 is connected with the cold side input port of cryogenic regenerator 4, another road is connected with the entrance of recompression machine 3, the cold side outlet port of the outlet of recompression machine and cryogenic regenerator 4 is by being divided into two-way after pipeline pipe, wherein, one tunnel is connected with the cold side input port of high temperature regenerator 5, another road is connected with the entrance of shunting low-level (stack-gas) economizer 68, the outlet of high temperature regenerator 5 cold side outlet port and shunting low-level (stack-gas) economizer 68 is all connected with the entrance of economizer 67, the outlet of economizer 67 is successively through the water-cooling wall 61 of boiler, after low temperature superheater 66 and high temperature superheater 63, the once gas entrance with high pressure turbine 7 is connected, the weary gas outlet reheated water-cooling wall 62 successively of high pressure turbine 7, after low-temperature reheater 65 and high temperature reheater 64, the secondary gas entrance with low pressure turbine 8 is connected, the weary gas outlet of low pressure turbine 8 is connected with the weary gas entrance of the hot side of cryogenic regenerator 4 through the hot side of high temperature regenerator 5, the axle that drives of electromotor 9 is connected with the output shaft of low pressure turbine 8, air preheater 69 it is additionally provided with in back-end ductwork。
Specific works process of the present utility model is:
The hot side of cryogenic regenerator 4 weary gas out is split into two parts, a part of weary gas by precooler 1 cool down laggard enter main compressor 2 boost, high pressure Biological process after boosting enters the cold side of cryogenic regenerator 4 and carries out pre-heating temperature elevation, the weary gas of another part is by being divided into two-way after confluxing with the high pressure Biological process of cryogenic regenerator 4 cold side output after recompression machine 3 boosting, wherein a road enters into the cold side of high temperature regenerator 5 and carries out pre-heating temperature elevation, another road working medium enters directly in the shunting low-level (stack-gas) economizer 68 in boiler 6 back-end ductwork and preheats, the working medium of working medium and the high temperature regenerator 5 cold side output of shunting low-level (stack-gas) economizer 68 output after confluxing in the porch of economizer 67 successively through economizer 67, water-cooling wall 61, low temperature superheater 66 and high temperature superheater 63 form once gas, once gas enters into expansion work in high pressure turbine 7, the weary gas reheated water-cooling wall 62 successively of high pressure turbine 7 output, low-temperature reheater 65 and high temperature reheater 64 form secondary gas, secondary gas enters in low pressure turbine 8 and does work, the spent stream that low pressure turbine 8 produces enters the hot side of cryogenic regenerator 4 through the hot side of high temperature regenerator 5, so that working medium forms a complete closed cycle in this system。
Wherein Biological process splits into two-way again after cryogenic regenerator cold side outlet port confluxes, wherein a road enters into the cold side of high temperature regenerator 5 and carries out pre-heating temperature elevation, another road then enters directly in the shunting low-level (stack-gas) economizer 68 in boiler 6 back-end ductwork and preheats, wherein, then the adjustment of shunt volume need to ensure in blood circulation premised on high temperature regenerator 5 heat exchange efficiency。If shunt volume is excessive again, in high temperature regenerator 5, cold side working medium flow then can be too small, causes that it by sufficiently cool for hot side working medium, namely can not can not utilize the waste heat of the weary gas of turbine fully, make this part of waste heat enter environment eventually through precooler 1, reduce the cycle efficieny of system on the contrary。Through calculating it can be seen that must not exceed the 8% of total flow for 22MPa, the blood circulation of 600/600/32 DEG C, then the shunt volume tapped in detail。
Above-described detailed description of the invention; the purpose of this utility model, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only detailed description of the invention of the present utility model; it is not limited to this utility model; all within spirit of the present utility model and principle, any amendment of making, equivalent replacement, improvement etc., should be included within protection domain of the present utility model。
Claims (2)
1. a coal-based supercritical carbon dioxide Brayton cycle double split flow efficient power generation system, it is characterized in that, including cryogenic regenerator (4), precooler (1), main compressor (2), recompression machine (3), high temperature regenerator (5), boiler (6), high pressure turbine (7), low pressure turbine (8), boiler (6) and electromotor (9)；
Boiler (6) along the direction that flue gas circulates by being sequentially connected logical burning gallery, main heat exchange passage and back-end ductwork composition, wherein, it is sequentially provided with water-cooling wall (61) and reheating water-cooling wall (62) along the direction of flue flowing in burning gallery, it is sequentially provided with high temperature superheater (63) and high temperature reheater (64) along the direction of flue gas circulation in main heat exchange passage, it is sequentially provided with baffle plate along the direction of flue gas circulation in back-end ductwork, economizer (67) and low-level (stack-gas) economizer (68), the both sides of baffle plate are provided with low-temperature reheater (65) and low temperature superheater (66)；
The weary gas outlet of cryogenic regenerator (4) hot side is divided into two-way, wherein, the one pre-cooled device in tunnel (1) is connected with the entrance of main compressor (2), the outlet of main compressor (2) is connected with the cold side input port of cryogenic regenerator (4), another road is connected with the entrance of recompression machine (3), the cold side outlet port of the outlet of recompression machine and cryogenic regenerator (4) is by being divided into two-way after pipeline pipe, wherein, one tunnel is connected with the cold side input port of high temperature regenerator (5), another road is connected with the entrance of shunting low-level (stack-gas) economizer (68), the outlet of high temperature regenerator (5) cold side outlet port and shunting low-level (stack-gas) economizer (68) is all connected with the entrance of economizer (67), the outlet of economizer (67) is successively through the water-cooling wall (61) of boiler, low temperature superheater (66) and high temperature superheater (63) are connected with the once gas entrance of high pressure turbine (7) afterwards, weary gas outlet reheated water-cooling wall (62) successively of high pressure turbine (7), low-temperature reheater (65) and high temperature reheater (64) are connected with the secondary gas entrance of low pressure turbine (8) afterwards, the weary gas outlet of low pressure turbine (8) is connected with the weary gas entrance of cryogenic regenerator (4) hot side through the hot side of high temperature regenerator (5), the driving axle of electromotor (9) is connected with the output shaft of low pressure turbine (8)。
2. coal-based supercritical carbon dioxide Brayton cycle double split flow efficient power generation system according to claim 1, it is characterised in that be additionally provided with air preheater (69) in described back-end ductwork。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105526576A (en) * | 2016-01-20 | 2016-04-27 | 西安热工研究院有限公司 | Coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system |
| CN105971679A (en) * | 2016-07-13 | 2016-09-28 | 西安热工研究院有限公司 | Supercritical water gasification and supercritical carbon dioxide Brayton cycle joint production system |
| CN106150580A (en) * | 2016-07-13 | 2016-11-23 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulates the layout and startup optimization mode being combined with combustion engine |
| CN106402831A (en) * | 2016-09-13 | 2017-02-15 | 华能国际电力股份有限公司 | Double-flue boiler for supercritical CO 2 Brayton cycle power generation system |
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- 2016-01-20 CN CN201620053790.4U patent/CN205332163U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526576A (en) * | 2016-01-20 | 2016-04-27 | 西安热工研究院有限公司 | Coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system |
| CN105971679A (en) * | 2016-07-13 | 2016-09-28 | 西安热工研究院有限公司 | Supercritical water gasification and supercritical carbon dioxide Brayton cycle joint production system |
| CN106150580A (en) * | 2016-07-13 | 2016-11-23 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulates the layout and startup optimization mode being combined with combustion engine |
| CN105971679B (en) * | 2016-07-13 | 2017-09-12 | 西安热工研究院有限公司 | Supercritical water gasification and supercritical carbon dioxide Brayton cycle Joint Production system |
| CN106402831A (en) * | 2016-09-13 | 2017-02-15 | 华能国际电力股份有限公司 | Double-flue boiler for supercritical CO 2 Brayton cycle power generation system |
| CN106402831B (en) * | 2016-09-13 | 2018-12-11 | 华能国际电力股份有限公司 | For supercritical CO2Double-flue boiler of Brayton cycle power generation system |
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