CN108167040B - Double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system - Google Patents

Double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system Download PDF

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CN108167040B
CN108167040B CN201711145126.8A CN201711145126A CN108167040B CN 108167040 B CN108167040 B CN 108167040B CN 201711145126 A CN201711145126 A CN 201711145126A CN 108167040 B CN108167040 B CN 108167040B
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waste heat
pressure
rankine cycle
organic rankine
heat boiler
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CN108167040A (en
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王辉涛
黄靖伦
王建军
朱道飞
王�华
韩金蓉
赵玲玲
王维蔚
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/02Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type

Abstract

The invention relates to a double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system, and belongs to the technical field of energy and environment. The method takes middle-low temperature waste heat flue gas with the temperature of 200-350 ℃ as a driving heat source, organic working medium feeding liquid is preheated in a preheating section of the ORC waste heat boiler to reach a saturated liquid state, then a part of saturated liquid organic working medium enters an evaporation section and a superheating section of the waste heat boiler, and generated saturated (or superheated) steam enters a centripetal turbine to complete a high-pressure-stage organic Rankine cycle expansion work-doing process. The other part of the saturated liquid organic working medium enters a flash evaporator after throttling and pressure reduction. And (4) introducing the saturated steam separated from the flash evaporator into a low-pressure-level screw expander to complete the low-pressure-level organic Rankine cycle expansion work-applying process. The injection compressor is adopted to recover the liquid-phase working medium separated by the flash evaporator, so that liquid delivery pumps are reduced, the system is simplified, and the possibility of cavitation of the pumps is eliminated.

Description

Double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system
Technical Field
The invention relates to a double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system, and belongs to the technical field of energy and environment.
Background
China has a large amount of waste heat resources, and particularly various flue gas waste heat resources have the characteristics of high recycling feasibility and high economical efficiency. In the production process of a plurality of high-energy-consumption industries such as steel, cement, caustic soda, synthetic ammonia, glass, sulfuric acid, calcium carbide and the like, a lot of medium and low temperature waste heat is not recycled, and the development and utilization potential of the medium and low temperature flue gas waste heat is more than 1 hundred million tons of standard coal. At present, many theoretical researches and engineering practices prove that Organic Rankine Cycle (ORC) is an important technology for efficiently recovering medium-low temperature waste heat. When the conventional single-stage ORC is used for recovering waste heat with higher temperature, the exhaust temperature of the waste heat flowing through the ORC heat exchange equipment is still higher, and the waste heat recovery rate is lower. There are many scholars who propose the use of multi-stage ORC technology. For example, some scholars propose an ejector-type organic rankine cycle (EORC) that recovers waste heat using a two-stage evaporator; the researchers also propose to recover the exhaust waste heat of the engine and the cooling water waste heat of the cylinder jacket by adopting two-stage organic Rankine cycle; the inventor also proposes a novel regenerative two-stage organic Rankine bottom cycle waste heat recovery system, wherein exhaust gas is used as a driving heat source in a high-temperature stage cycle, and exhaust gas, cooling water and exhaust gas of the high-temperature stage cycle are used as driving heat sources in a low-temperature stage cycle. Although these methods can improve the efficiency, they lead to complex systems, too high equipment cost, and reduced technical economy of the systems, which are not favorable for popularization and application in practical engineering. In view of the above, the invention uses the medium-low temperature waste heat flue gas with the temperature of 200-350 ℃ as a driving heat source to preheat the organic working medium feeding liquid in the preheating section of the ORC waste heat boiler to a saturated liquid state, then, a part of the saturated liquid organic working medium enters the evaporation section and the overheating section of the waste heat boiler, and the generated saturated (or overheated) steam enters the centripetal turbine to complete the high-pressure-stage organic Rankine cycle expansion work-doing process. The other part of the saturated liquid organic working medium enters a flash evaporator after throttling and pressure reduction. Saturated steam separated from the flash evaporator enters a low-pressure-stage screw expander to complete the low-pressure-stage organic Rankine cycle expansion work-applying process, and efficient cascade utilization of waste heat resources can be fully realized. The injection compressor is adopted to recover the liquid-phase working medium separated by the flash evaporator, so that liquid delivery pumps are reduced, the system is simplified, and the possibility of cavitation of the pumps is eliminated.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system. The method takes middle-low temperature waste heat flue gas with the temperature of 200-350 ℃ as a driving heat source, organic working medium feeding liquid is preheated in a preheating section of the ORC waste heat boiler to reach a saturated liquid state, then a part of saturated liquid organic working medium enters an evaporation section and a superheating section of the waste heat boiler, and generated saturated (or superheated) steam enters a centripetal turbine to complete a high-pressure-stage organic Rankine cycle expansion work-doing process. The other part of the saturated liquid organic working medium enters a flash evaporator after throttling and pressure reduction. And (4) introducing the saturated steam separated from the flash evaporator into a low-pressure-level screw expander to complete the low-pressure-level organic Rankine cycle expansion work-applying process. The injection compressor is adopted to recover the liquid-phase working medium separated by the flash evaporator, so that liquid delivery pumps are reduced, the system is simplified, and the possibility of cavitation of the pumps is eliminated. The invention is realized by the following technical scheme.
A double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system comprises a low-pressure-level organic Rankine cycle system, a high-pressure-level organic Rankine cycle system, and a pipeline and an accessory which are connected; the low-pressure-stage organic Rankine cycle system and the high-pressure-stage organic Rankine cycle system respectively comprise an ORC waste heat boiler, and the ORC waste heat boiler is divided into a preheating section, an evaporation section and a superheating section;
the low-pressure organic Rankine cycle system comprises an ORC waste heat boiler preheating section, a pressure reducing valve, a flash evaporator, a screw expander, a generator, a condenser, a condensation pump, an injection compressor and a connecting pipeline accessory; the high-pressure organic Rankine cycle system comprises an ORC waste heat boiler evaporation section, a superheat section, a centripetal turbine, a generator, a condenser, a condensation pump, an injection compressor and a connecting pipeline accessory;
one side of an ORC waste heat boiler in the low-pressure organic Rankine cycle system is provided with a medium-low temperature waste heat flue gas inlet, the other side of the ORC waste heat boiler is provided with a medium-low temperature waste heat flue gas inlet outlet, a preheating section organic working medium outlet of an ORC waste heat boiler 1 is divided into two sections, one section is connected to a pressure reducing valve through a pipeline and then connected to an inlet of a flash evaporator, a saturated steam outlet positioned at the top of the flash evaporator is connected to an inlet of a screw expander through a pipeline, the screw expander expands to apply work to generate electricity for a generator, a saturated liquid outlet positioned at the bottom of the flash evaporator is connected to an injection cavity inlet of an injection compressor, an exhaust steam outlet of the screw expander is connected to a steam inlet of a condenser, an organic working medium condensate outlet in the condenser is connected to an injection cavity;
the organic working medium outlet of the preheating section of the ORC waste heat boiler is divided into two sections, one section is connected to a pressure reducing valve through a pipeline, the other section is connected to an evaporation section and a superheat section of the ORC waste heat boiler in the high-pressure organic Rankine cycle system through a pipeline, a superheated steam outlet of the superheat section of the ORC waste heat boiler is connected with a centripetal turbine through a pipeline, the centripetal turbine expands to apply work to drive a generator to generate electricity, a waste steam outlet at the bottom of the centripetal turbine is connected with a waste steam outlet of a screw expander in the low-pressure organic Rankine cycle system and then is connected with a steam inlet of a condenser, and an organic working medium condensate outlet in the.
When the condenser is the water-cooled condenser, the device still includes cooling water circulating system, and cooling water circulating system includes condenser, circulating water pump and cooling tower, and condenser cooling water exit linkage is to the water inlet of cooling tower, and the cooling water export of cooling tower is connected to the import of circulating water pump by the pipeline, and the cooling water import of condenser is inserted again to the circulating water pump export, forms cooling water circulation return circuit.
The working principle of the double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system is as follows:
the method comprises the following steps that middle-low temperature waste heat flue gas with various temperatures of 200-350 ℃ is used as a driving heat source, the middle-low temperature waste heat flue gas enters from a middle-low temperature waste heat flue gas inlet of an ORC waste heat boiler, organic working medium feeding liquid is preheated to a saturated liquid state in a preheating section of the ORC waste heat boiler, then, a part of saturated liquid organic working medium enters an evaporation section and a superheating section of the ORC waste heat boiler to generate saturated (or superheated) steam, and the saturated (or superheated) steam enters a centripetal turbine to complete a high-pressure;
the other saturated liquid organic working medium at the preheating section of the ORC waste heat boiler enters a flash evaporator through a pressure reducing valve, and saturated steam separated from the flash evaporator enters a low-pressure-stage screw expansion machine to complete the low-pressure-stage organic Rankine cycle expansion work-doing process; a saturated liquid outlet at the bottom of the flash evaporator is connected to an inlet of an injection cavity of the injection compressor;
the waste steam discharged by the low-pressure stage screw expander and the centripetal turbine is mixed and then enters a condenser, condensed into organic working medium condensate, then the organic working medium condensate is pressurized by a condensing pump and then enters an injection compressor, the organic working medium condensate and saturated liquid at the bottom of a flash evaporator are mixed in the injection compressor, then the organic working medium condensate enters a diffusion section of the injection compressor for pressurization, and finally the organic working medium condensate is used as feed liquid of an ORC waste heat boiler and enters a preheating section for heating, so that a circulation process is completed.
The invention has the beneficial effects that:
(1) the organic Rankine cycle system adopts two-stage pressure expansion, the high-pressure stage uses an ORC waste heat boiler to generate saturated (or superheated) steam, the low-pressure stage uses a part of saturated liquid working medium at the outlet of the preheating section to generate flash steam, and the efficient cascade utilization of waste heat resources can be fully realized.
(2) The injection compressor is adopted to recover the liquid-phase working medium separated by the flash evaporator, so that liquid delivery pumps are reduced, the system is simplified, and the possibility of cavitation of the pumps is eliminated.
Drawings
FIG. 1 is a schematic diagram of a device for recycling medium and low temperature waste heat to generate power by using a water-cooled condenser and a double-pressure expansion organic Rankine cycle as a condenser in embodiment 1 of the invention;
FIG. 2 is a schematic diagram of a device for recycling medium and low temperature waste heat to generate power by using an air-cooled condenser as a condenser in embodiment 2 of the invention.
In the figure: the system comprises a 1-ORC waste heat boiler, a 2-centripetal turbine, a 3-generator, a 4-pressure reducing valve, a 5-flash evaporator, a 6-screw expander, a 7-condenser, an 8-condensation pump, a 9-jet compressor, a 10-circulating water pump and a 11-cooling tower.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1
As shown in FIG. 1, the double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system comprises a low-pressure stage organic Rankine cycle system, a high-pressure stage organic Rankine cycle system and connected pipelines and accessories; the low-pressure-stage organic Rankine cycle system and the high-pressure-stage organic Rankine cycle system both comprise an ORC waste heat boiler 1, and the ORC waste heat boiler 1 is divided into a preheating section, an evaporation section and a superheating section;
the low-pressure organic Rankine cycle system comprises an ORC waste heat boiler 1 preheating section, a pressure reducing valve 4, a flash evaporator 5, a screw expander 6, a generator 3, a condenser 7, a condensation pump 8, an injection compressor 9 and connecting pipeline accessories; the high-pressure organic Rankine cycle system comprises an ORC waste heat boiler 1, an evaporation section, a superheat section, a centripetal turbine 2, a generator 3, a condenser 7, a condensation pump 8, an injection compressor 9 and connecting pipeline accessories;
one side of an ORC waste heat boiler 1 in the low-pressure organic Rankine cycle system is provided with a medium-low temperature waste heat flue gas inlet (the temperature of introduced low-temperature waste heat flue gas is 200-350 ℃, the mass flow is 155400 kg/h), the other side of the low-low temperature waste heat flue gas inlet is provided with a medium-low temperature waste heat flue gas outlet, an organic working medium outlet of a preheating section of the ORC waste heat boiler 1 is divided into two sections (the circulating working medium adopts R245 fa), one section is connected to a pressure reducing valve 4 through a pipeline and then connected to an inlet of a flash evaporator 5, a saturated steam outlet positioned at the top of the flash evaporator 5 is connected to an inlet of a screw expander 6 through a pipeline, the screw expander 6 performs expansion work to generate power for a generator 3, a saturated liquid outlet positioned at the bottom of the flash evaporator 5 is connected to an injection cavity inlet of an injection compressor 9, an organic working medium condensate outlet in the condenser 7 is connected to an injection cavity inlet of an injection compressor 9 through a condensation pump 8, and an organic working medium outlet at a diffusion section of the injection compressor 9 is connected with an organic working medium inlet at a preheating section of the ORC waste heat boiler 1;
the preheating section organic working medium outlet of the ORC waste heat boiler 1 is divided into two sections, one section is connected to the pressure reducing valve 4 through a pipeline, the other section is connected to an evaporation section (the evaporation temperature is set to be 95 ℃) and a superheat section of the ORC waste heat boiler 1 in the high-pressure organic Rankine cycle system through a pipeline, a superheated steam outlet of the superheat section of the ORC waste heat boiler 1 is connected with the centripetal turbine 2 through a pipeline, the centripetal turbine 2 does work through expansion to generate power for the generator 3, a waste steam outlet at the bottom of the centripetal turbine 2 is connected with a waste steam outlet of the screw expander 6 in the low-pressure organic Rankine cycle system and then is connected with a steam inlet of the condenser 7, and an organic working medium condensate outlet in the condenser 7.
The structural parameters of the preheating section of the ORC waste heat boiler 1 are as follows: the heat transfer pipe adopts high-frequency welding finned tubes, the outer diameter of a light pipe is 40mm, the inner diameter of the light pipe is 32mm, the length of the light pipe is 3.8m, the thickness of each fin is 1mm, the pitch of the fins is 8mm, the height of each fin is 15mm, the fin ratio is 6.25, the fin efficiency is 0.69, the number of the finned tubes is 392, the heat transfer pipe is arranged in an equilateral triangle, the transverse spacing of the finned tubes is 90mm, the number of transverse tube rows is 28, and the number of longitudinal tube rows is 14; the structure parameters of the evaporation section and the overheating section of the ORC waste heat boiler 1 are as follows: the heat transfer pipe adopts a high-frequency welding finned pipe, the outer diameter of a light pipe is 42mm, the inner diameter of the light pipe is 34mm, and the length of the light pipe is 3.8 m. The fin thickness is 2mm, the fin pitch is 10mm, the fin height is 12mm, the fin ratio is 4.2, the fin efficiency is 0.86, the number of finned tubes is 392, the finned tubes are arranged in an equilateral triangle, the transverse spacing of the finned tubes is 86mm, and the number of transverse tube rows is 30; when condenser 7 was the water-cooled condenser, the device still included cooling water circulation system, and cooling water circulation system includes condenser 7, circulating water pump 10 and cooling tower 11, and 7 cooling water exit linkage in cooling tower 11's water inlet of condenser, and 11 cooling water exports by the import of pipe connection to circulating water pump 10 of cooling tower, and the cooling water import of condenser 7 is access again in circulating water pump 10 export, forms cooling water circulation circuit.
The centripetal turbine 2 adopts an excitation alternating current generator with the rated power of 2500kW and the frequency of 50Hz, and a generator 3 in the high-pressure organic Rankine cycle system adopts a 3000kW rated power; the screw expander 6 adopts an excitation alternating current generator with the rated power of 1500kW and the frequency of 50Hz, and the generator 3 in the low-pressure organic Rankine cycle system adopts a 2000kW rated power; the coagulation pump 8 adopts two shield pumps with the model number of BA32H-222H2BM-50-40-160-FV and the flow rate of 600m3The lift is 100m, and the water is used and prepared; and (3) adopting stainless steel pipes for all pipelines, after the pipelines are completely filled, carrying out nitrogen purging on the pipelines, and filling the pipelines into R245fa as required after the organic Rankine cycle pipeline is vacuumized to be qualified.
Example 2
As shown in FIG. 1, the double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system comprises a low-pressure stage organic Rankine cycle system, a high-pressure stage organic Rankine cycle system and connected pipelines and accessories; the low-pressure-stage organic Rankine cycle system and the high-pressure-stage organic Rankine cycle system both comprise an ORC waste heat boiler 1, and the ORC waste heat boiler 1 is divided into a preheating section, an evaporation section and a superheating section;
the low-pressure organic Rankine cycle system comprises an ORC waste heat boiler 1 preheating section, a pressure reducing valve 4, a flash evaporator 5, a screw expander 6, a generator 3, a condenser 7, a condensation pump 8, an injection compressor 9 and connecting pipeline accessories; the high-pressure organic Rankine cycle system comprises an ORC waste heat boiler 1, an evaporation section, a superheat section, a centripetal turbine 2, a generator 3, a condenser 7, a condensation pump 8, an injection compressor 9 and connecting pipeline accessories;
one side of an ORC waste heat boiler 1 in the low-pressure organic Rankine cycle system is provided with a medium-low temperature waste heat flue gas inlet (the temperature of introduced low-temperature waste heat flue gas is 200-350 ℃, the mass flow is 155400 kg/h), the other side of the low-low temperature waste heat flue gas inlet is provided with a medium-low temperature waste heat flue gas inlet outlet, an organic working medium outlet of a preheating section of the ORC waste heat boiler 1 is divided into two sections (the circulating working medium adopts R245 fa), one section is connected to a pressure reducing valve 4 through a pipeline and then connected to an inlet of a flash evaporator 5, a saturated steam outlet positioned at the top of the flash evaporator 5 is connected to an inlet of a screw expander 6 through a pipeline, the screw expander 6 performs expansion work to generate power for a generator 3, a saturated liquid outlet positioned at the bottom of the flash evaporator 5 is connected to an injection cavity inlet of an injection, an organic working medium condensate outlet in the condenser 7 is connected to an injection cavity inlet of an injection compressor 9 through a condensation pump 8, and an organic working medium outlet at a diffusion section of the injection compressor 9 is connected with an organic working medium inlet at a preheating section of the ORC waste heat boiler 1;
the preheating section organic working medium outlet of the ORC waste heat boiler 1 is divided into two sections, one section is connected to the pressure reducing valve 4 through a pipeline, the other section is connected to an evaporation section (the evaporation temperature is set to be 95 ℃) and a superheat section of the ORC waste heat boiler 1 in the high-pressure organic Rankine cycle system through a pipeline, a superheated steam outlet of the superheat section of the ORC waste heat boiler 1 is connected with the centripetal turbine 2 through a pipeline, the centripetal turbine 2 does work through expansion to generate power for the generator 3, a waste steam outlet at the bottom of the centripetal turbine 2 is connected with a waste steam outlet of the screw expander 6 in the low-pressure organic Rankine cycle system and then is connected with a steam inlet of the condenser 7, and an organic working medium condensate outlet in the condenser 7.
The preheating section of the ORC waste heat boiler 1 has the following structural parameters: the heat transfer pipe adopts high-frequency welding finned tubes, the outer diameter of a light pipe is 40mm, the inner diameter of the light pipe is 32mm, the length of the light pipe is 3.8m, the thickness of each fin is 1mm, the pitch of the fins is 8mm, the height of each fin is 15mm, the fin ratio is 6.25, the fin efficiency is 0.69, the number of the finned tubes is 392, the heat transfer pipe is arranged in an equilateral triangle, the transverse spacing of the finned tubes is 90mm, the number of transverse tube rows is 28, and the number of longitudinal tube rows is 14; the structure parameters of the evaporation section and the overheating section of the ORC waste heat boiler 1 are as follows: the heat transfer pipe adopts a high-frequency welding finned pipe, the outer diameter of a light pipe is 42mm, the inner diameter of the light pipe is 34mm, and the length of the light pipe is 3.8 m. The fin thickness is 2mm, the fin pitch is 10mm, the fin height is 12mm, the fin ratio is 4.2, the fin efficiency is 0.86, the number of finned tubes is 392, the finned tubes are arranged in an equilateral triangle, the transverse spacing of the finned tubes is 86mm, and the number of transverse tube rows is 30; wherein the condenser 7 is an air-cooled condenser.
The centripetal turbine 2 adopts an excitation alternating current generator with the rated power of 2500kW and the frequency of 50Hz, and a generator 3 in the high-pressure organic Rankine cycle system adopts a 3000kW rated power; the screw expander 6 adopts an excitation alternating current generator with the rated power of 1500kW and the frequency of 50Hz, and the generator 3 in the low-pressure organic Rankine cycle system adopts a 2000kW rated power; the coagulation pump 8 adopts two shield pumps with the model number of BA32H-222H2BM-50-40-160-FV and the flow rate of 600m3The lift is 100m, and the water is used and prepared; and (3) adopting stainless steel pipes for all pipelines, after the pipelines are completely filled, carrying out nitrogen purging on the pipelines, and filling the pipelines into R245fa as required after the organic Rankine cycle pipeline is vacuumized to be qualified.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.

Claims (2)

1. A double-pressure expansion organic Rankine cycle recovery medium-low temperature waste heat power generation system is characterized in that: the device comprises a low-pressure-level organic Rankine cycle system, a high-pressure-level organic Rankine cycle system and connected pipelines and accessories; the low-pressure-stage organic Rankine cycle system and the high-pressure-stage organic Rankine cycle system respectively comprise an ORC waste heat boiler (1), and the ORC waste heat boiler (1) is divided into a preheating section, an evaporation section and a superheating section;
the low-pressure organic Rankine cycle system comprises an ORC waste heat boiler (1), a preheating section, a pressure reducing valve (4), a flash evaporator (5), a screw expander (6), a generator (3), a condenser (7), a condensation pump (8), an injection compressor (9) and connecting pipeline accessories; the high-pressure organic Rankine cycle system comprises an ORC waste heat boiler (1), an evaporation section, a superheat section, a centripetal turbine (2), a generator (3), a condenser (7), a condensation pump (8), an injection compressor (9) and connecting pipeline accessories;
one side of an ORC waste heat boiler (1) in the low-pressure organic Rankine cycle system is provided with a medium-low temperature waste heat flue gas inlet, the other side of the ORC waste heat boiler is provided with a medium-low temperature waste heat flue gas inlet outlet, a preheating section organic working medium outlet of the ORC waste heat boiler (1) is divided into two sections, one section is connected to a pressure reducing valve (4) through a pipeline and then connected to an inlet of a flash evaporator (5), a saturated steam outlet positioned at the top of the flash evaporator (5) is connected to an inlet of a screw expander (6) through a pipeline, the screw expander (6) expands and works to generate power for a generator (3), a saturated liquid outlet positioned at the bottom of the flash evaporator (5) is connected to an injection cavity inlet of an injection compressor (9), a waste steam outlet of the screw expander (6) is connected to a steam inlet of a condenser (7), an organic working medium condensate outlet in the condenser, an organic working medium outlet of a diffusion section of the injection compressor (9) is connected with an organic working medium inlet of a preheating section of the ORC waste heat boiler (1);
the other section of the organic working medium outlet of the preheating section of the ORC waste heat boiler (1) is connected to an evaporation section and a superheating section of the ORC waste heat boiler (1) in the high-pressure organic Rankine cycle system through a pipeline, the superheated steam outlet of the superheating section of the ORC waste heat boiler (1) is connected with the centripetal turbine (2) through a pipeline, the centripetal turbine (2) performs expansion and work to generate power for the generator (3), and a waste steam outlet at the bottom of the centripetal turbine (2) is connected with a waste steam outlet of a screw expander (6) in the low-pressure organic Rankine cycle system and then is connected with a steam inlet of the condenser.
2. The dual pressure expansion organic rankine cycle recovery medium and low temperature waste heat power generation system of claim 1, characterized in that: when condenser (7) is the water-cooled condenser, the device still includes cooling water circulation system, and cooling water circulation system includes condenser (7), circulating water pump (10) and cooling tower (11), and condenser (7) cooling water exit linkage to the water inlet of cooling tower (11), and the cooling water export of cooling tower (11) is connected to the import of circulating water pump (10) by the pipeline, and circulating water pump (10) export is inserted the cooling water import of condenser (7) again, forms cooling water circulation circuit.
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CN103775145A (en) * 2014-01-15 2014-05-07 天津大学 Organic Rankine circulating system with double-ejector supercharging device
CN104315750A (en) * 2014-10-27 2015-01-28 势加透博(北京)科技有限公司 System and method for cooling gas compressor inlet gas
CN107218094A (en) * 2017-04-21 2017-09-29 昆明理工大学 A kind of multiple pressure flashes the device of organic Rankine bottoming cycle cogeneration

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