CN111396160A - Flue gas waste heat cogeneration system and cogeneration method - Google Patents

Flue gas waste heat cogeneration system and cogeneration method Download PDF

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Publication number
CN111396160A
CN111396160A CN202010301547.0A CN202010301547A CN111396160A CN 111396160 A CN111396160 A CN 111396160A CN 202010301547 A CN202010301547 A CN 202010301547A CN 111396160 A CN111396160 A CN 111396160A
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China
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heat
flue gas
valve
unit
heat exchange
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CN202010301547.0A
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Chinese (zh)
Inventor
王璞尧
韩卿洋
陈龙
杨兆瀚
许庆禄
袁智威
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703th Research Institute of CSIC
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703th Research Institute of CSIC
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Priority to CN202010301547.0A priority Critical patent/CN111396160A/en
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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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10Adaptations for driving, or combinations with, electric generators
    • 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
    • F01K13/00General layout or general methods of operation of complete plants
    • F01K13/02Controlling, e.g. stopping or starting
    • 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
    • F01K25/00Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00Domestic hot-water supply systems
    • F24D17/0005Domestic hot-water supply systems using recuperation of waste heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/18Domestic hot-water supply systems using recuperated or waste heat

Abstract

A flue gas waste heat cogeneration system and a cogeneration method relate to a cogeneration system and a cogeneration method. The invention aims to solve the problem of low utilization rate of recovered waste heat of the existing organic Rankine cycle low-temperature flue gas waste heat recovery power generation system which is used independently. A flue gas heat exchange unit B is connected in series with an organic Ranunculi metal circulating unit A, and a heat supply unit C is connected in series with the flue gas heat exchange unit B; through the combined circulation of the flue gas heat exchange unit, the organic Ranunculi circulation unit and the heat supply unit, the utilization rate of waste heat can be improved to 40-50%. The method comprises the following steps: heat exchange of the flue gas waste heat resource 1; step two: water media in the organic Rankine cycle unit A and the flue gas heat exchange unit B exchange heat; step three: adjusting the opening of the valve according to the working condition requirement; step four: the heat supply unit C realizes heat supply to users; step five: the organic Rankine cycle unit A realizes power supply to a user. The invention is used for reasonably utilizing the waste heat of the flue gas.

Description

Flue gas waste heat cogeneration system and cogeneration method
Technical Field
The invention relates to a flue gas waste heat cogeneration system and a cogeneration method. In particular to a flue gas waste heat cogeneration system and a cogeneration method based on organic Rankine cycle, belonging to the energy power industry.
Background
The flue gas waste heat resource is a typical secondary energy widely existing in various industrial production processes, and is waste heat in a flue gas form discharged by insufficient combustion and other reasons in the utilization and processing process of primary energy sources such as fossil fuel. At present, the heat recycling means of the waste heat of the flue gas with higher temperature (more than 250 ℃) is mature, but the reasonable utilization of the low-temperature flue gas waste heat resource with the temperature lower than 250 ℃ is a difficult problem.
Most of low-temperature flue gas in industrial production is directly discharged and cannot be directly utilized, the organic Rankine cycle is one of effective means for carrying out low-temperature flue gas waste heat recovery and power generation, but the efficiency of an independent organic Rankine cycle unit is only about 10%. Industrial production plants producing waste heat of flue gas have large power demand and heat demand basically, and a large amount of waste heat of flue gas at low temperature section can be used for heating and power consumption of the plants.
Disclosure of Invention
The invention aims to solve the problem that the existing organic Rankine cycle low-temperature flue gas waste heat recovery power generation system used independently is low in waste heat recovery utilization. Further provides a flue gas waste heat cogeneration system and a cogeneration method.
The technical scheme of the invention is as follows: a combined heat and power system for waste heat of flue gas comprises an organic Ranian circulation unit, a flue gas heat exchange unit and a heat supply unit, wherein the flue gas heat exchange unit is connected in series with the organic Ranian circulation unit; the flue gas heat exchange unit comprises a water tank, a valve I, a valve II, a flue gas heat exchanger, a water pump and a valve III, the valve IV, a first metal pipeline and a second metal pipeline, the flue gas heat exchanger is connected with flue gas waste heat resources, a flue gas discharge pipeline is arranged on the flue gas heat exchanger, one end of the first metal pipeline is connected with the outlet end of an evaporator on the organic Rana circulating unit, the other end of the first metal pipeline is connected with the inlet end of the evaporator on the organic Rana circulating unit, the valve I, the water tank, the flue gas heat exchanger, the water pump and the valve IV are sequentially installed on the metal pipeline to form a first loop, one end of the second metal pipeline is communicated with the first metal pipeline between the water pump and the valve IV, the other end of the second metal pipeline is communicated with the first metal pipeline between the valve I and the water tank, and the valve III, the heat supply unit and the valve II are sequentially installed on the second metal pipeline to.
Further, the first valve, the water tank, the flue gas heat exchanger, the water pump and the fourth valve are clockwise installed on the metal pipeline to form a first heat exchange loop.
Further, a third valve, a heating unit and a second valve are arranged on the second metal pipeline anticlockwise to form a second heating loop.
Furthermore, the heat supply unit comprises a heat exchange station, a user heat input pipeline and a medium to be heated input pipeline, the heat exchange station is connected in series with a second metal pipeline of the second heat supply loop, and the user heat input pipeline and the medium to be heated input pipeline are respectively connected with the heat exchange station.
Furthermore, the heat input pipeline for the user and the pipeline of the medium input pipeline to be heated are both metal pipelines.
Furthermore, the organic Rankine cycle unit comprises a turbine, a condenser, a liquid storage tank, an organic working medium circulating pump, an evaporator and a pipeline, wherein the two ends of the pipeline are respectively connected with the output end and the input end of the evaporator, the turbine, the condenser, the liquid storage tank and the organic working medium circulating pump are sequentially installed on the pipeline, and the condenser is provided with a cold water inlet end and a cold water return end.
Furthermore, the turbine, the condenser, the liquid storage tank and the organic working medium circulating pump are clockwise arranged on the pipeline.
Further, the organic Rankine cycle unit further comprises an engine, and the engine is connected with the turbine.
The invention also provides a combined heat and power method, which comprises the following steps:
the method comprises the following steps: heat exchange of flue gas waste heat resources;
the recovered low-temperature flue gas waste heat resource enters a flue gas heat exchanger to exchange heat with water entering a flue gas heat exchange unit, the water of the flue gas heat exchange unit is stored in a water tank, pressurized and acted by a water pump and then flows into the flue gas heat exchanger, and the flue gas heat is absorbed and then respectively enters an organic Rankine cycle unit through a valve IV and enters a heat supply unit through a valve III;
step two: water media exchange heat in the organic Rankine cycle unit and the flue gas heat exchange unit;
the water passing through the valve IV in the flue gas heat exchange unit transfers heat to an organic working medium in the organic Rankine cycle unit through an evaporator, and the water passing through the valve III in the flue gas heat exchange unit transfers heat to a medium to be heated in the heat supply unit through a heat exchange station;
step three: adjusting the opening of the valve according to the working condition requirement;
when the heat supply temperature of the industrial production plant is required to be higher than 80 ℃, opening a second valve and a third valve, and reducing the first valve and the fourth valve;
when the power consumption demand of the industrial production plant is larger than the generated energy of the plant self-contained power plant, opening a first valve and a fourth valve, and reducing a second valve and a third valve;
step four: the heat supply unit realizes heat supply and reflux heat exchange for users;
after absorbing the heat of water in the flue gas heat exchange unit in the heat exchange station, a medium to be heated in the heat supply unit enters a user heat input pipeline, and after the heat supply of a user heat end is finished and the temperature is reduced, the medium to be heated flows back to the heat exchange station again through the medium to be heated input pipeline, and then flows into the flue gas heat exchange unit for circulating heat exchange, so that the heat supply and the backflow heat exchange of the heat supply unit are completed;
step five: the organic Rankine cycle unit realizes power supply to users;
the organic working medium in the organic Rankine cycle unit is converted into a high-temperature gaseous working medium at 90-120 ℃, the high-temperature gaseous working medium enters a turbine to drive the turbine to rotate to do work, the turbine drives a generator to generate power, the gaseous organic working medium doing work by the turbine enters a condenser and is condensed into a low-temperature liquid working medium at 30-40 ℃ by cooling water in a plant area, and the low-temperature liquid organic working medium is pressurized by an organic working medium pump and enters an evaporator to complete power supply of the organic Rankine cycle unit.
Further, the organic working medium of the organic Rankine cycle unit in the fourth step is R134a or R245 fa.
Compared with the prior art, the invention has the following effects:
1. the organic Rankine cycle power generation technology and the heat supply technology are combined aiming at the heat recovery of the flue gas waste heat resource, the high-efficiency reasonable utilization of the waste heat resource can be reasonably realized according to the actual demand of an industrial plant with the flue gas waste heat resource, the heating and power utilization efficiency of related enterprises is improved, and therefore the influence on the environment is reduced.
2. According to the invention, by setting the combined heat and power system comprising the organic Rankine cycle unit, the heat supply unit and the flue gas heat exchange unit, water in the flue gas heat exchange unit absorbs heat of flue gas waste heat, and relevant valves are adjusted according to heat supply and power demand of a plant area to control hot water to respectively enter the organic Rankine cycle unit to heat organic working media for power generation and enter the heat supply unit to supply heat, so that reasonable and graded utilization of flue gas waste heat resources is realized.
3. According to the invention, through the combined circulation of the flue gas heat exchange unit, the organic Ranunculi circulation unit and the heat supply unit, the waste heat utilization rate can be increased to 40-50%, the full recycling of low-temperature flue gas waste heat resources is realized, the operation cost of an industrial production plant is reduced, and the thermal pollution to the environment is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, and the flue gas waste heat cogeneration system of the embodiment comprises an organic brown cycle unit a, a flue gas heat exchange unit B and a heat supply unit C, wherein the flue gas heat exchange unit B is connected in series with the organic brown cycle unit a, and the heat supply unit C is connected in series with the flue gas heat exchange unit B; the flue gas heat exchange unit B comprises a water tank 2, a first valve 3, a second valve 4, a flue gas heat exchanger 5, a water pump 7, a third valve 8, a fourth valve 9, a first metal pipeline D and a second metal pipeline E, the flue gas heat exchanger 5 is connected with the flue gas waste heat resource 1, a flue gas discharge pipeline 6 is arranged on the flue gas heat exchanger 5, one end of the first metal pipeline D is connected with the outlet end of an evaporator 20 on the organic Rana circulation unit A, the other end of the first metal pipeline D is connected with the inlet end of the evaporator 20 on the organic Rana circulation unit A, the first valve 3, the water tank 2, the flue gas heat exchanger 5, the water pump 7 and the fourth valve 9 are sequentially arranged on the metal pipeline D to form a first loop, one end of the second metal pipeline E is communicated with the first metal pipeline D between the water pump 7 and the fourth valve 9, the other end of the second metal pipeline E is communicated with the first metal pipeline, and the third valve 8, the heat supply unit C and the second valve 4 are sequentially arranged on the second metal pipeline E to form a second loop.
The organic Rankine cycle unit of the embodiment meets the power consumption requirement of a user, and the heat supply unit meets the heat requirement of the user.
The second embodiment is as follows: referring to fig. 1, the first valve 3, the water tank 2, the flue gas heat exchanger 5, the water pump 7 and the fourth valve 9 of the present embodiment are installed on the metal pipeline D clockwise to form a first heat exchange loop. Due to the arrangement, the medium passing through the flue gas heat exchanger 5 is conveyed to the evaporator 20, and heat is transferred to the organic working medium in the organic Brown circulating unit A for power generation. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: referring to fig. 1, the third valve 8, the heating unit C and the second valve 4 of the present embodiment are installed on the second metal pipe E counterclockwise to form a second heating loop. The arrangement is used as another loop, so that the medium passing through the flue gas heat exchanger 5 can be conveyed to the heat exchange station 11 conveniently, and heat is transferred to the medium to be heated in the heat supply unit C for supplying hot water to users. Other compositions and connections are the same as in the first or second embodiments.
The fourth concrete implementation mode: referring to fig. 1, the heat supply unit C of the present embodiment includes a heat exchange station 11, a user heat input pipeline 10, and a to-be-heated medium input pipeline 12, the heat exchange station 11 is connected in series to a second metal pipeline E of a second heat supply loop, and the user heat input pipeline 10 and the to-be-heated medium input pipeline 12 are respectively connected to the heat exchange station 11. So set up, simple structure has formed a complete water circulating system through the user, and continuous hot water of supplying with to the user, the cooling water backward flow of heat transfer continues the heat transfer, the water economy resource, and heat exchange efficiency is high. Other compositions and connection relationships are the same as in the first, second or third embodiment.
The fifth concrete implementation mode: referring to fig. 1, the present embodiment will be described, in which the user heat input pipe 10 and the medium to be heated input pipe 12 are both metal pipes. So set up, life is high. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.
The sixth specific implementation mode: referring to fig. 1, the organic rankine cycle unit a of the present embodiment includes a turbine 18, a condenser 16, a liquid storage tank 14, an organic working medium circulation pump 13, an evaporator 20 and a pipeline F, wherein two ends of the pipeline F are respectively connected to an output end and an input end of the evaporator 20, the turbine 18, the condenser 16, the liquid storage tank 14 and the organic working medium circulation pump 13 are sequentially installed on the pipeline F, and the condenser 16 is provided with a cold water inlet 15 and a cold water return 17. So set up, be convenient for the acting electricity generation for the waste heat resource of flue gas obtains better utilization. Other compositions and connection relationships are the same as in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: referring to fig. 1, the turbine 18, the condenser 16, the liquid storage tank 14, and the organic working medium circulation pump 13 of the present embodiment are installed on the pipeline F clockwise. So set up, sealed effectual. Other compositions and connection relationships are the same as in the first, second, third, fourth, fifth or sixth embodiment.
The specific implementation mode is eight: referring to fig. 1, the embodiment will be described, and the organic brown cycle unit a of the embodiment further includes an engine 19, and the engine 19 is connected to a turbine 18. So set up, be convenient for realize the electricity generation. Other components and connection relationships are the same as those in any one of the first to seventh embodiments.
The specific implementation method nine: the present embodiment will be described with reference to fig. 1, and the cogeneration method of the present embodiment includes the steps of:
the method comprises the following steps: heat exchange of the flue gas waste heat resource 1;
the recovered low-temperature flue gas waste heat resource 1 enters a flue gas heat exchanger 5 to exchange heat with water in a flue gas heat exchange unit B, the water in the flue gas heat exchange unit B is stored in a water tank 2, pressurized by a water pump 7 to do work and then flows into the flue gas heat exchanger 5, and the water enters an organic Rankine cycle unit A through a valve IV 9 and enters a heat supply unit C through a valve III 8 after absorbing flue gas heat;
step two: exchanging heat of water media in the organic Rankine cycle unit A and the heat supply unit C;
the water passing through the valve IV 9 in the flue gas heat exchange unit B transfers heat to the organic working medium in the organic Rankine cycle unit A through the evaporator 20, and the water passing through the valve III 8 in the flue gas heat exchange unit B transfers heat to a medium to be heated 12 in the heat supply unit through the heat exchange station 11;
step three: adjusting the opening of the valve according to the working condition requirement;
when the heat supply temperature of the industrial production plant is required to be higher than 80 ℃, opening the second valve 4 and the third valve 8, and reducing the first valve 3 and the fourth valve 9;
when the power consumption demand of the industrial production plant is larger than the generated energy of the self-contained power plant of the plant, opening a first valve 3 and a fourth valve 9, and reducing a second valve 4 and a third valve 8;
step four: the heat supply unit C realizes heat supply and reflux heat exchange for users;
after absorbing the heat of the water in the flue gas heat exchange unit B in the heat exchange station 11, the medium to be heated in the heat supply unit C enters the user heat input pipeline 10, and after the heat supply of the user heat end is finished and the temperature is reduced, the medium to be heated flows back to the heat exchange station 11 again through the medium to be heated input pipeline 12, and then flows into the flue gas heat exchange unit B for circulating heat exchange, so that the heat supply and the backflow heat exchange of the heat supply unit C are completed;
step five: the organic Rankine cycle unit A realizes power supply for users;
the organic working medium in the organic Rankine cycle unit A is converted into a high-temperature gaseous working medium at 90-120 ℃, the high-temperature gaseous working medium enters a turbine 18 to drive the turbine 18 to rotate to do work, the turbine 18 drives a generator 19 to generate electricity, the gaseous organic working medium doing work by the turbine 18 enters a condenser 16 and is condensed into a low-temperature liquid working medium at 30-40 ℃ by cooling water 15 in a plant area, and the low-temperature liquid organic working medium is pressurized by an organic working medium pump 13 and enters an evaporator 20 to complete power supply of the organic Rankine cycle unit A.
The medium to be heated of the heat supply unit of the present embodiment is liquid water.
The detailed implementation mode is ten: referring to fig. 1, the organic working medium in the organic rankine cycle unit a in the fourth step of the present embodiment is R134a or R245 fa. Other components and connection relationships are the same as those in any one of the first to ninth embodiments.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a flue gas waste heat cogeneration system, it includes organic brown circulation unit (A), its characterized in that: the organic Rankine cycle flue gas heat exchanger also comprises a flue gas heat exchange unit (B) and a heat supply unit (C), wherein the flue gas heat exchange unit (B) is connected in series with the organic Rankine cycle unit (A), and the heat supply unit (C) is connected in series with the flue gas heat exchange unit (B);
the flue gas heat exchange unit (B) comprises a water tank (2), a first valve (3), a second valve (4), a flue gas heat exchanger (5), a water pump (7), a third valve (8), a fourth valve (9), a first metal pipeline (D) and a second metal pipeline (E),
the flue gas heat exchanger (5) is connected with the flue gas waste heat resource (1), a flue gas discharge pipeline (6) is arranged on the flue gas heat exchanger (5), one end of a first metal pipeline (D) is connected with the outlet end of an evaporator (20) on an organic Rana circulating unit (A), the other end of the first metal pipeline (D) is connected with the inlet end of the evaporator (20) on the organic Rana circulating unit (A), a first valve (3), a water tank (2), the flue gas heat exchanger (5), a water pump (7) and a fourth valve (9) are sequentially installed on the metal pipeline (D) to form a first loop, one end of a second metal pipeline (E) is communicated with the first metal pipeline (D) between the water pump (7) and the fourth valve (9), the other end of the second metal pipeline (E) is communicated with the first metal pipeline (D) between the first valve (3) and the water tank (2), and a third valve (8), And the heat supply unit (C) and the second valve (4) are sequentially arranged on the second metal pipeline (E) to form a second loop.
2. The combined heat and power system utilizing the waste heat of the flue gas as set forth in claim 1, wherein: the first valve (3), the water tank (2), the flue gas heat exchanger (5), the water pump (7) and the fourth valve (9) are clockwise installed on the metal pipeline (D) to form a first heat exchange loop.
3. The combined heat and power system utilizing the waste heat of the flue gas as set forth in claim 2, wherein: and the third valve (8), the heat supply unit (C) and the second valve (4) are arranged on the second metal pipeline (E) anticlockwise to form a second heat supply loop.
4. The combined heat and power system utilizing the waste heat of the flue gas as set forth in claim 3, wherein: the heat supply unit (C) comprises a heat exchange station (11), a user heat input pipeline (10) and a medium to be heated input pipeline (12), the heat exchange station (11) is connected in series with a second metal pipeline (E) of the second heat supply loop, and the user heat input pipeline (10) and the medium to be heated input pipeline (12) are respectively connected with the heat exchange station (11).
5. The combined heat and power system utilizing the waste heat of the flue gas as set forth in claim 6, wherein: the heat input pipeline (10) for users and the pipeline of the medium input pipeline (12) to be heated are both metal pipelines.
6. The combined heat and power system utilizing the waste heat of the flue gas as set forth in claim 5, wherein: organic Lung circulation unit (A) includes turbine (18), condenser (16), liquid storage pot (14), organic working medium circulating pump (13), evaporimeter (20) and pipeline (F), and the both ends of pipeline (F) are connected with the output and the input of evaporimeter (20) respectively, and turbine (18), condenser (16), liquid storage pot (14) and organic working medium circulating pump (13) are installed in proper order on pipeline (F), are equipped with cold water inlet end (15) and cold water return end (17) on condenser (16).
7. The combined heat and power system utilizing the waste heat of the flue gas as set forth in claim 6, wherein: the turbine (18), the condenser (16), the liquid storage tank (14) and the organic working medium circulating pump (13) are clockwise arranged on the pipeline (F).
8. The combined heat and power system utilizing the waste heat of the flue gas as set forth in claim 7, wherein: the organic Brown cycle unit (A) further comprises an engine (19), the engine (19) being connected to the turbine (18).
9. A cogeneration method using the flue gas waste heat cogeneration system of any one of claims 1 to 8, characterized in that: it comprises the following steps:
the method comprises the following steps: heat exchange of the flue gas waste heat resource (1);
the recovered low-temperature flue gas waste heat resource (1) enters a flue gas heat exchanger (5) to exchange heat with water entering a flue gas heat exchange unit (B), the water of the flue gas heat exchange unit (B) is stored in a water tank (2), pressurized and acted by a water pump (7) and then flows into the flue gas heat exchanger (5), and after absorbing flue gas heat, the flue gas heat respectively enters an organic Rankine cycle unit (A) through a valve four (9) and enters a heat supply unit (C) through a valve three (8);
step two: water medium heat exchange is carried out between the organic Rankine cycle unit (A) and the flue gas heat exchange unit (B);
the heat is transferred to the organic working medium in the organic Rankine cycle unit (A) through the evaporator (20) by the water in the valve IV (9) in the flue gas heat exchange unit (B), and the heat is transferred to the medium to be heated (12) in the heat supply unit by the water in the flue gas heat exchange unit (B) in the valve III (8) through the heat exchange station (11);
step three: adjusting the opening of the valve according to the working condition requirement;
when the heat supply temperature of the industrial production plant is required to be higher than 80 ℃, opening the second valve (4) and the third valve (8), and reducing the first valve (3) and the fourth valve (9);
when the power consumption demand of an industrial production plant is larger than the generated energy of a self-contained power plant of the plant, opening a first valve (3) and a fourth valve (9) and reducing a second valve (4) and a third valve (8);
step four: the heat supply unit (C) realizes heat supply and reflux heat exchange for users;
after absorbing the heat of water in the flue gas heat exchange unit (B) in the heat exchange station (11), a medium to be heated in the heat supply unit (C) enters a user heat input pipeline (10), and after the heat supply of a user heat end is finished and the temperature is reduced, the medium to be heated flows back to the heat exchange station (11) again through the medium to be heated input pipeline (12) and then flows into the flue gas heat exchange unit (B) for circulating heat exchange, so that the heat supply and the backflow heat exchange of the heat supply unit (C) are completed;
step five: the organic Rankine cycle unit (A) realizes power supply to a user;
after the organic working medium in the organic Rankine cycle unit (A) is converted into a high-temperature gaseous working medium at 90-120 ℃, the high-temperature gaseous working medium enters a turbine (18) to drive the turbine (18) to rotate to do work, the turbine (18) drives a generator (19) to generate power, the gaseous organic working medium doing work through the turbine (18) enters a condenser (16) and is condensed into a low-temperature liquid working medium at 30-40 ℃ by cooling water (15) in a plant area, and the low-temperature liquid organic working medium is pressurized by an organic working medium pump (13) and enters an evaporator (20) to complete power supply of the organic Rankine cycle unit (A).
10. The cogeneration method of claim 9, wherein: and in the fourth step, the organic working medium of the organic Rankine cycle unit (A) is R134a or R245 fa.
CN202010301547.0A 2020-04-16 2020-04-16 Flue gas waste heat cogeneration system and cogeneration method Pending CN111396160A (en)

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Publication number Priority date Publication date Assignee Title
CN113279830A (en) * 2021-06-03 2021-08-20 宁波海运股份有限公司 Steam Rankine system of combined heat and power supply marine diesel engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113279830A (en) * 2021-06-03 2021-08-20 宁波海运股份有限公司 Steam Rankine system of combined heat and power supply marine diesel engine

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