CN104712432A - Two-stage organic Rankine cycle power generation system utilizing exhaust heat of gas turbine - Google Patents
Two-stage organic Rankine cycle power generation system utilizing exhaust heat of gas turbine Download PDFInfo
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Abstract
The invention discloses a two-stage organic Rankine cycle power generation system utilizing exhaust heat of a gas turbine. The system comprises a gas compressor (1), the gas turbine (3), a high-temperature steam turbine (11), a low-temperature steam turbine (15) and a power generator (18), wherein the gas compressor (1) is connected with a combustion chamber (2) through a pipeline; the combustion chamber (2) is connected with the gas turbine (3) through a pipeline; the gas turbine (3) is connected with a waste heat boiler (4) through a flue gas pipeline; the waste heat boiler (4) is connected with the high-temperature steam turbine (11) through a high-temperature organic Rankine cycle system (19) and connected with the low-temperature steam turbine (15) through a low-temperature organic Rankine cycle system (20). Through combined use of the high-temperature organic Rankine cycle system and the low-temperature organic Rankine cycle system, gradient utilization of flue gas waste heat of the gas turbine is realized.
Description
Technical field
The present invention relates to the power generation system that a kind of two-stage organic Rankine bottoming cycle utilizes gas turbine smoke discharging residual heat, belong to field of generating equipment.
Background technique
At present, China, still based on coal fired power generation, brings serious pollution problem; Coal-burning power plant is away from central city, and by electrical network transmission & distribution, there is certain energy loss, total efficiency of energy utilization is lower.And distributed energy resource system meets the criterion of " cascade utilization " of supply system, there is the advantages such as efficiency of energy utilization is high, energy-provision way is various, environmental protection, and closely energy supply, decrease electric energy, the heat energy energy loss in course of conveying.In recent years, be that the distributed energy resource system of core obtains very fast development in China with small size gas turbine, the capacity of small size gas turbine generally at 1 ~ 20MW, flexible configuration.The temperature of exhaust fume of small size gas turbine is at 400 ~ 550 DEG C, smoke discharging residual heat is reclaimed according to steam turbine, because flue gas flow is less, cause the little thermal efficiency of the capacity of steam turbine lower, equipment investment is large, and floor space is large, and varying duty ability is poor, earning rate is less, therefore often the smoke discharging residual heat of small size gas turbine is directly used in heat supply in engineering or supplies lithium bromide absorbing type refrigeration.Direct heat utilization, the energy figure factor is low, and by restrictions such as seasonal factors, may not necessarily utilize smoke discharging residual heat completely, and then can not give full play to the advantage of cascaded utilization of energy.
Summary of the invention
The object of the invention is to, a kind of two-stage organic Rankine bottoming cycle is provided to utilize the power generation system of gas turbine smoke discharging residual heat, high temperature organic Rankine bottoming cycle utilizes the heat of high-temperature flue gas, and drive the generating of High Temperature Gas turbine, low-temperature flue gas then supplies low temperature organic rankine cycle system and generates electricity; By parameter matching, realize the cascade utilization of gas turbine flue gas waste heat.
Technological scheme of the present invention: a kind of two-stage organic Rankine bottoming cycle utilizes the power generation system of gas turbine smoke discharging residual heat, comprise the coaxial gas compressor, gas turbine, high-temperature steam turbine, low-temperature turbine and the generator that arrange, gas compressor is connected with firing chamber by pipeline, firing chamber is connected with gas turbine by pipeline, gas turbine is connected with exhaust heat boiler by fume pipe, exhaust heat boiler is connected with high-temperature steam turbine by high temperature organic rankine cycle system, and exhaust heat boiler is connected with low-temperature turbine by low temperature organic rankine cycle system.Two-stage organic Rankine bottoming cycle tandem arrangement, the high temperature steam condenser of high temperature organic Rankine bottoming cycle, as the vaporizer of low temperature organic Rankine bottoming cycle, namely only has low temperature organic Rankine bottoming cycle to there is cold source energy.High temperature organic Rankine bottoming cycle utilizes the heat of high-temperature flue gas, and low temperature organic Rankine bottoming cycle utilizes the heat of low-temperature flue gas, and high temperature organic working medium condensation thermal discharge is absorbed by low temperature organic Rankine bottoming cycle, achieves the cascade utilization of energy.
Aforesaid two-stage organic Rankine bottoming cycle utilizes in the power generation system of gas turbine smoke discharging residual heat, and described high temperature organic rankine cycle system comprises the heat-condutive oil heat exchanger, high-temperature evaporator and the high-temperature preheater that are connected in turn by conduction oil transfer conduit; Also comprise regenerator, high temperature steam condenser and high temperature refrigerant pump, high-temperature preheater is connected with high-temperature evaporator by working medium transmission pipeline, high-temperature evaporator is connected with high-temperature steam turbine by working medium transmission pipeline, high-temperature steam turbine is connected with regenerator, high temperature steam condenser and high temperature refrigerant pump successively by working medium transmission pipeline, high temperature refrigerant pump is finally connected with high-temperature preheater after being again connected with regenerator by working medium transmission pipeline, and described heat-condutive oil heat exchanger is located in exhaust heat boiler.
Aforesaid two-stage organic Rankine bottoming cycle utilizes in the power generation system of gas turbine smoke discharging residual heat, described low temperature organic rankine cycle system comprises air cooling condenser and low-temperature pre-heater, low-temperature pre-heater is connected with high temperature steam condenser by working medium transmission pipeline, high temperature steam condenser is connected with the admission line of low-temperature turbine by working medium transmission pipeline, the outlet pipe of low-temperature turbine is connected with air cooling condenser by working medium transmission pipeline, air cooling condenser is connected with low-temperature pre-heater by working medium transmission pipeline, and described low-temperature pre-heater is located in exhaust heat boiler.。
Aforesaid two-stage organic Rankine bottoming cycle utilizes in the power generation system of gas turbine smoke discharging residual heat, and the conduction oil transfer conduit that high-temperature preheater is connected with heat-condutive oil heat exchanger is provided with Heat-transfer Oil Pump; The working medium transmission pipeline that air cooling condenser is connected with low-temperature pre-heater is provided with cryogenic fluid pump.
Aforesaid two-stage organic Rankine bottoming cycle utilizes in the power generation system of gas turbine smoke discharging residual heat, is filled with conduction oil in described conduction oil transfer conduit; The working medium of filling in the working medium transmission pipeline of high temperature organic rankine cycle system is MDM; The working medium of filling in the working medium transmission pipeline of low temperature organic rankine cycle system is R123.Described MDM is octamethyltrisiloxane, and R123 is trifluorobichloroethane, is the well known materials of related domain.
Aforesaid two-stage organic Rankine bottoming cycle utilizes in the power generation system of gas turbine smoke discharging residual heat, high-temperature steam turbine and low-temperature turbine reversed arrangement.High Temperature Gas turbine and low temperature gas-turbine reversed arrangement, to eliminate end thrust.
Aforesaid two-stage organic Rankine bottoming cycle utilizes in the power generation system of gas turbine smoke discharging residual heat, is also provided with middle temperature flue gas heat-exchange unit in exhaust heat boiler.Middle temperature flue gas heat-exchange unit utilizes the flue gas heat of about 200 DEG C, for lithium-bromide absorption-type refrigerating machine or directly provide water vapor higher than 100 DEG C.
Compared with prior art, present invention achieves the cascade utilization of gas turbine flue gas waste heat, high temperature organic Rankine bottoming cycle utilizes the heat drive gas-turbine of high-temperature flue gas to generate electricity, and middle temperature flue gas is for lithium bromide absorbing type refrigeration or heat supply, and low-temperature flue gas then supplies low temperature organic Rankine bottoming cycle and generates electricity; And according to user's actual need, the multiple kinds of energies such as electric, hot, cold can be supplied; Organic Rankine bottoming cycle running temperature is lower, and volume is little, reduces floor space and equipment investment.
Advantage of the present invention also has: two-stage organic Rankine bottoming cycle, only has low temperature organic Rankine bottoming cycle to there is cold source energy; Can according to gas turbine operation parameter, the running temperature of adjustment high temperature organic Rankine bottoming cycle and low temperature organic Rankine bottoming cycle and working medium flow, coupling gas turbine temperature of exhaust fume, reduces irreversible loss, and improves generated energy and the efficiency of energy utilization of system; Smoke discharging residual heat for small size gas turbine utilizes, and the equipment investment of organic Rankine bottoming cycle is less than the condensing steam turbine of same capacity, and load adaptability is good, and part-load efficiency is high, and maintenance cost is low.
The present invention adopts low temperature organic working medium in addition, and in utilization in low temperature heat energy, the thermal efficiency is higher than water vapor Rankine cycle.Adopt the gas-turbine thermal efficiency of organic working medium high, and be less than the condensing steam turbine of same capacity by the impact of load variations, organic working medium employing master stream body, is in overheated zone after expansion, there is not the erosion to blade of gas turbine; Volume flowrate and the expansion ratio of organic working medium are less than water vapor, and size and the metal wastage of gas-turbine are less; In addition, organic Rankine bottoming cycle also has that start and stop are convenient, load adaptability is good, the sub load thermal efficiency is high and the advantage such as maintenance cost is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Being labeled as in accompanying drawing: 1-gas compressor, 2-firing chamber, 3-gas turbine, 4-exhaust heat boiler, 5-heat-condutive oil heat exchanger, warm flue gas heat-exchange unit in 6-, 7-low-temperature pre-heater, 8-high-temperature evaporator, 9-high-temperature preheater, 10-Heat-transfer Oil Pump, 11-high-temperature steam turbine, 12-regenerator, 13-high temperature steam condenser, 14-high temperature refrigerant pump, 15-low-temperature turbine, 16-air cooling condenser, 17-cryogenic fluid pump, 18-generator, 19-high temperature organic rankine cycle system, 20-low temperature organic rankine cycle system.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated, but not as the foundation limited the present invention.
Embodiments of the invention: as shown in Figure 1, a kind of two-stage organic Rankine bottoming cycle utilizes the power generation system of gas turbine smoke discharging residual heat, comprise the coaxial gas compressor 1 arranged, gas turbine 3, high-temperature steam turbine 11, low-temperature turbine 15 and generator 18, gas compressor 1 is connected with firing chamber 2 by pipeline, firing chamber 2 is connected with gas turbine 3 by pipeline, gas turbine 3 is connected with exhaust heat boiler 4 by fume pipe, exhaust heat boiler 4 is connected with high-temperature steam turbine 11 by high temperature organic rankine cycle system 19, exhaust heat boiler 4 is connected with low-temperature turbine 15 by low temperature organic rankine cycle system 20.High-temperature steam turbine 11 and low-temperature turbine 15 reversed arrangement.
Described high temperature organic rankine cycle system 19 comprises the heat-condutive oil heat exchanger 5, high-temperature evaporator 8 and the high-temperature preheater 9 that are connected in turn by conduction oil transfer conduit; Also comprise regenerator 12, high temperature steam condenser 13 and high temperature refrigerant pump 14, high-temperature preheater 9 is connected with high-temperature evaporator 8 by working medium transmission pipeline, high-temperature evaporator 8 is connected with high-temperature steam turbine 11 by working medium transmission pipeline, high-temperature steam turbine 11 is connected with regenerator 12, high temperature steam condenser 13 and high temperature refrigerant pump 14 successively by working medium transmission pipeline, high temperature refrigerant pump 14 is again connected with regenerator 12 by working medium transmission pipeline and is finally connected with high-temperature preheater 9 afterwards, and described heat-condutive oil heat exchanger 5 is located in exhaust heat boiler 4.
Described low temperature organic rankine cycle system 20 comprises air cooling condenser 16 and low-temperature pre-heater 7, low-temperature pre-heater 7 is connected with high temperature steam condenser 13 by working medium transmission pipeline, high temperature steam condenser 13 is connected with the admission line of low-temperature turbine 15 by working medium transmission pipeline, the outlet pipe of low-temperature turbine 15 is connected with air cooling condenser 16 by working medium transmission pipeline, air cooling condenser 16 is connected with low-temperature pre-heater 7 by working medium transmission pipeline, and described low-temperature pre-heater 7 is located in exhaust heat boiler 4.Middle temperature flue gas heat-exchange unit 6 is also provided with in exhaust heat boiler 4.
The conduction oil transfer conduit that high-temperature preheater 9 is connected with heat-condutive oil heat exchanger 5 is provided with Heat-transfer Oil Pump 10; The working medium transmission pipeline that air cooling condenser 16 is connected with low-temperature pre-heater 7 is provided with cryogenic fluid pump 17.
Conduction oil is filled with in described conduction oil transfer conduit; The working medium of filling in the working medium transmission pipeline of high temperature organic rankine cycle system 19 is MDM; The working medium of filling in the working medium transmission pipeline of low temperature organic rankine cycle system 20 is R123.Adopt this working medium all nontoxic and non-combustible, and the cascade utilization of smoke discharging residual heat can be realized.
Working principle of the present invention: operationally, air enters gas compressor 1 and pressurizes this system, then enter firing chamber 2 and mix with rock gas and burn, high-temperature flue gas enters gas turbine 3 expansion work, and the flue gas after acting enters exhaust heat boiler 4.
In exhaust heat boiler 4, first high-temperature flue gas heats conduction oil, high temperature heat conductive oil passes through conduction oil transfer conduit successively through high-temperature evaporator 8 and high-temperature preheater 9, high temperature organic working medium MDM is heated to vapor state, then exhaust heat boiler 4 is returned through Heat-transfer Oil Pump 10, high temperature organic working medium forms steam and enters High Temperature Gas turbine 11 expansion work in high-temperature evaporator 8, organic working medium after acting is in superheat state, first through regenerator 12, preheating enters the organic working medium of high-temperature preheater 9, then high temperature steam condenser 13 is entered, saturated liquid state is cooled to by low temperature organic working medium, pressurize through high temperature refrigerant pump 14, successively by regenerator 12, high-temperature preheater 9, high-temperature evaporator 8, complete circulation.
Low temperature organic working medium evaporates the latent heat absorbing high temperature refrigerant in high temperature steam condenser, then low temperature gas-turbine 15 expansion work is entered, weary gas after acting enters air cooling condenser 16 and is cooled to saturated liquid state, then enter through cryogenic fluid pump 17 pressurization the heat that low-temperature pre-heater 7 absorbs low-temperature flue gas, then enter high temperature gas condensating device 13 and complete circulation.
Claims (7)
1. a two-stage organic Rankine bottoming cycle utilizes the power generation system of gas turbine smoke discharging residual heat, comprise the coaxial gas compressor (1) arranged, gas turbine (3), high-temperature steam turbine (11), low-temperature turbine (15) and generator (18), it is characterized in that: gas compressor (1) is connected with firing chamber (2) by pipeline, firing chamber (2) is connected with gas turbine (3) by pipeline, gas turbine (3) is connected with exhaust heat boiler (4) by fume pipe, exhaust heat boiler (4) is connected with high-temperature steam turbine (11) by high temperature organic rankine cycle system (19), exhaust heat boiler (4) is connected with low-temperature turbine (15) by low temperature organic rankine cycle system (20).
2. a kind of two-stage organic Rankine bottoming cycle according to claim 1 utilizes the power generation system of gas turbine smoke discharging residual heat, it is characterized in that: described high temperature organic rankine cycle system (19) comprises the heat-condutive oil heat exchanger (5), high-temperature evaporator (8) and the high-temperature preheater (9) that are connected in turn by conduction oil transfer conduit, also comprise regenerator (12), high temperature steam condenser (13) and high temperature refrigerant pump (14), high-temperature preheater (9) is connected with high-temperature evaporator (8) by working medium transmission pipeline, high-temperature evaporator (8) is connected with high-temperature steam turbine (11) by working medium transmission pipeline, high-temperature steam turbine (11) by working medium transmission pipeline successively with regenerator (12), high temperature steam condenser (13) is connected with high temperature refrigerant pump (14), high temperature refrigerant pump (14) is finally connected with high-temperature preheater (9) after being again connected with regenerator (12) by working medium transmission pipeline, described heat-condutive oil heat exchanger (5) is located in exhaust heat boiler (4).
3. a kind of two-stage organic Rankine bottoming cycle according to claim 2 utilizes the power generation system of gas turbine smoke discharging residual heat, it is characterized in that: described low temperature organic rankine cycle system (20) comprises air cooling condenser (16) and low-temperature pre-heater (7), low-temperature pre-heater (7) is connected with high temperature steam condenser (13) by working medium transmission pipeline, high temperature steam condenser (13) is connected by the admission line of working medium transmission pipeline with low-temperature turbine (15), the outlet pipe of low-temperature turbine (15) is connected with air cooling condenser (16) by working medium transmission pipeline, air cooling condenser (16) is connected with low-temperature pre-heater (7) by working medium transmission pipeline, described low-temperature pre-heater (7) is located in exhaust heat boiler (4).
4. a kind of two-stage organic Rankine bottoming cycle according to claim 3 utilizes the power generation system of gas turbine smoke discharging residual heat, it is characterized in that: the conduction oil transfer conduit that high-temperature preheater (9) is connected with heat-condutive oil heat exchanger (5) is provided with Heat-transfer Oil Pump (10); The working medium transmission pipeline that air cooling condenser (16) is connected with low-temperature pre-heater (7) is provided with cryogenic fluid pump (17).
5. a kind of two-stage organic Rankine bottoming cycle according to claim 4 utilizes the power generation system of gas turbine smoke discharging residual heat, it is characterized in that: be filled with conduction oil in described conduction oil transfer conduit; The working medium of filling in the working medium transmission pipeline of high temperature organic rankine cycle system (19) is MDM; The working medium of filling in the working medium transmission pipeline of low temperature organic rankine cycle system (20) is R123.
6. a kind of two-stage organic Rankine bottoming cycle according to claim 1 utilizes the power generation system of gas turbine smoke discharging residual heat, it is characterized in that: high-temperature steam turbine (11) and low-temperature turbine (15) reversed arrangement.
7. a kind of two-stage organic Rankine bottoming cycle according to Claims 2 or 3 utilizes the power generation system of gas turbine smoke discharging residual heat, it is characterized in that: be also provided with middle temperature flue gas heat-exchange unit (6) in exhaust heat boiler (4).
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| CN104989530A (en) * | 2015-07-15 | 2015-10-21 | 中国电力工程顾问集团华东电力设计院有限公司 | Heat supplying system of heat-conducting oil in combined heat and power generation of gas-steam combined cycle and heat supplying method |
| CN105298567A (en) * | 2015-11-19 | 2016-02-03 | 中国核动力研究设计院 | Industrial waste heat utilization system adopting supercritical carbon dioxide working medium |
| CN105605776A (en) * | 2016-03-03 | 2016-05-25 | 杭州锅炉集团股份有限公司 | Heat transfer oil heat-exchanging energy-saving system |
| CN106925115A (en) * | 2017-03-28 | 2017-07-07 | 中国华电科工集团有限公司 | It is the gas distributed energy system and technique of reducing agent denitration using liquefied ammonia |
| CN107060923A (en) * | 2017-03-07 | 2017-08-18 | 吉林大学 | Space backheat organic Rankine bottoming cycle complementary energy recovery system and control strategy |
| CN108798808A (en) * | 2018-06-11 | 2018-11-13 | 山东理工大学 | A kind of CO for high-temperature flue gas waste heat recovery2Circulating thermoelectric co-generation system |
| CN113301988A (en) * | 2019-03-15 | 2021-08-24 | 三菱动力株式会社 | Apparatus and method for processing raw material fluid |
| CN114508420A (en) * | 2021-12-29 | 2022-05-17 | 东方电气集团东方汽轮机有限公司 | Parallel gas turbine compressor exhaust waste heat utilization system |
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| CN113301988A (en) * | 2019-03-15 | 2021-08-24 | 三菱动力株式会社 | Apparatus and method for processing raw material fluid |
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Address after: 100160 Beijing, Fengtai District Automobile Museum Road, No. 6, Ying Kun century A block, floor 11 Applicant after: CHINA HUADIAN ENGINEERING CO., LTD. Applicant after: Huadian Distributed Energy Engineering & Technology Co., Ltd. Address before: 100160 Beijing, Fengtai District Automobile Museum Road, No. 6, Ying Kun century A block, floor 11 Applicant before: China Huadian Engineering (Group) Co., Ltd. Applicant before: Huadian Distributed Energy Engineering & Technology Co., Ltd. |
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| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150617 |
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| RJ01 | Rejection of invention patent application after publication |