CN110905618A - Internal combustion engine cogeneration waste heat recovery system suitable for distributed energy system - Google Patents
Internal combustion engine cogeneration waste heat recovery system suitable for distributed energy system Download PDFInfo
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- CN110905618A CN110905618A CN201911124284.4A CN201911124284A CN110905618A CN 110905618 A CN110905618 A CN 110905618A CN 201911124284 A CN201911124284 A CN 201911124284A CN 110905618 A CN110905618 A CN 110905618A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/065—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
- F02G5/04—Profiting from waste heat of exhaust gases in combination with other waste heat from combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G2260/00—Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses an internal combustion engine cogeneration waste heat recovery system suitable for a distributed energy system, which comprises an organic Rankine cycle, an absorption heat pump, a first hot water heat exchanger (13), a second hot water heat exchanger (14), a low-temperature flue gas heat exchanger (15) and a charge air cooler (16), wherein: the organic Rankine cycle comprises a flue gas heat exchanger (1), an expander (2), a first condenser (3) and a working medium pump (4); the absorption heat pump comprises a generator (5), a second condenser (6), an expansion valve (7), an evaporator (8), an absorber (9), a valve (10), a solution pump and a solution exchanger; the invention mainly forms an efficient waste heat recovery system by mutually coupling the organic Rankine cycle, the absorption heat pump and the plurality of independent heat exchangers, and can fully utilize the waste heat of the flue gas and the pressurized air of the internal combustion engine according to the principle of energy utilization according to the quality, thereby saving precious energy and having good energy-saving and emission-reducing effects.
Description
Technical Field
The invention relates to the technical field of energy utilization, in particular to a heat and power cogeneration waste heat recovery system of an internal combustion engine, which is suitable for a distributed energy system.
Background
At present, along with the increasing severity of energy crisis and environmental problems, distributed energy systems are increasingly receiving attention from people because of having the advantages of high energy utilization rate, flexible operation and the like. The internal combustion engine is a very important prime mover in the distributed energy system, however, the operation efficiency of the internal combustion engine is only about 40%, and a large amount of heat is taken away by smoke, cylinder water and pressurized air. Therefore, the waste heat recovery technology is a method for effectively improving the efficiency of the internal combustion engine.
For an internal combustion engine, the grade of each waste heat source of the internal combustion engine is different, wherein: the most main waste heat source is flue gas, the temperature of the flue gas can reach about 600 ℃, the temperature of the flue gas is greatly reduced after the flue gas is recovered by waste heat, the energy quality span is large, and the flue gas belongs to large-temperature-difference waste heat; secondly, the residual heat of the cylinder liner water is used, but the temperature of the cylinder liner water is generally between 75 and 85 ℃; for an intake supercharged engine, the charge air also carries away a portion of the heat, which is typically around 150 ℃ at the outlet of the supercharger.
However, the conventional simple waste heat recovery system cannot effectively recover and utilize various waste heat of the internal combustion engine.
Disclosure of Invention
The invention aims to provide a heat and power cogeneration waste heat recovery system of an internal combustion engine, which is suitable for a distributed energy system, aiming at the technical defects in the prior art.
Therefore, the invention provides an internal combustion engine cogeneration waste heat recovery system suitable for a distributed energy system, which comprises an organic Rankine cycle, an absorption heat pump, a first hot water heat exchanger, a second hot water heat exchanger, a low-temperature flue gas heat exchanger and a charge air cooler, wherein:
the organic Rankine cycle comprises a flue gas heat exchanger, an expander, a first condenser and a working medium pump;
the absorption heat pump comprises a generator, a second condenser, an expansion valve, an evaporator, an absorber, a valve, a solution pump and a solution exchanger;
for an organic Rankine cycle, an air inlet of the flue gas heat exchanger is communicated with a flue gas outlet of the internal combustion engine;
the working medium outlet of the flue gas heat exchanger is communicated with the working medium inlet of the expansion machine;
the working medium outlet of the expansion machine is communicated with the working medium inlet of the first condenser;
the working medium outlet of the first condenser is communicated with the inlet of the working medium pump;
the outlet of the working medium pump is communicated with the working medium inlet of the flue gas heat exchanger;
for the absorption heat pump, an inlet of a pressurized air circulation pipeline in the generator is communicated with an air outlet of a turbocharger;
a flue gas bypass branch is communicated with the front of an air inlet of the organic Rankine cycle flue gas heat exchanger;
the smoke bypass branch is communicated with an inlet of a smoke circulation pipeline in the generator;
the generator is provided with an inlet of a flue gas circulation pipeline and is also communicated with an air outlet of the flue gas heat exchanger.
Wherein, the generator is provided with an outlet of a flue gas circulation pipeline which is communicated with the low-temperature flue gas heat exchanger through a first hot water heat exchanger;
the outlet of a charge air circulation pipeline arranged in the generator is communicated with the charge air cooler through a second hot water heat exchanger;
the cooling water outlet of the first condenser is respectively communicated with the cooling water inlets of the low-temperature flue gas heat exchanger and the charge air cooler;
the cooling water outlets of the low-temperature flue gas heat exchanger and the charge air cooler are communicated with the cooling water inlet of the evaporator after converging through a hollow connecting pipeline;
the working medium inlet of the evaporator is communicated with the working medium outlet of the second condenser through an expansion valve;
the working medium inlet of the second condenser is communicated with the working medium outlet of the generator;
the working medium outlet of the evaporator is communicated with the working medium inlet of the absorber.
The first working medium outlet at the top of the absorber is communicated with the first inlet of the solution heat exchanger through a valve;
a second working medium outlet of the absorber is communicated with a second inlet of the solution heat exchanger through a solution pump;
the first outlet of the solution heat exchanger is communicated with the first inlet of the solution heat exchanger through an internal connecting coil;
the first outlet of the solution heat exchanger is communicated with the first working medium inlet of the generator;
the second outlet of the solution heat exchanger is communicated with the second inlet of the solution heat exchanger through an internal connecting coil;
and the second outlet of the solution heat exchanger is communicated with the second working medium inlet of the generator.
Compared with the prior art, the internal combustion engine cogeneration waste heat recovery system suitable for the distributed energy system is provided by the technical scheme, and the efficient waste heat recovery system is formed by mutually coupling the absorption heat pump and the independent heat exchangers through the organic Rankine cycle, can fully utilize the waste heat of the flue gas and the pressurized air of the internal combustion engine according to the principle of energy utilization according to the quality, thereby saving precious energy, having good energy-saving and emission-reducing effects, being beneficial to popularization and application and having great practical significance.
Drawings
Fig. 1 is a schematic structural diagram of a co-generation waste heat recovery system of an internal combustion engine suitable for a distributed energy system provided by the invention.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1, the present invention provides an internal combustion engine cogeneration waste heat recovery system suitable for a distributed energy system, comprising an organic rankine cycle, an absorption heat pump, a first hot water heat exchanger 13, a second hot water heat exchanger 14, a low temperature flue gas heat exchanger 15 and a charge air cooler 16, wherein:
the organic Rankine cycle comprises a flue gas heat exchanger 1, an expander 2, a first condenser 3 and a working medium pump 4;
the absorption heat pump includes a generator 5, a second condenser 6, an expansion valve 7, an evaporator 8, an absorber 9, a valve 10, a solution pump 11, and a solution exchanger 12.
In the present invention, in a specific implementation, for an organic rankine cycle, an air inlet of the flue gas heat exchanger 1 is communicated with a flue gas outlet of the internal combustion engine 100 (through a hollow connecting pipeline);
the working medium outlet of the flue gas heat exchanger 1 is communicated with the working medium inlet of the expansion machine 2;
the working medium outlet of the expander 2 is communicated with the working medium inlet of the first condenser 3;
the working medium outlet of the first condenser 3 is communicated with the inlet of the working medium pump 4;
the outlet of the working medium pump 4 is communicated with the working medium inlet of the flue gas heat exchanger 1.
In the present invention, in a specific implementation, for an absorption heat pump, an inlet of a pressurized air circulation pipeline (such as a coil pipe) in the generator 5 is communicated with an air outlet of the turbocharger 101;
in the concrete implementation, a flue gas bypass branch is communicated with the front of an air inlet of the organic Rankine cycle flue gas heat exchanger 1;
the flue gas bypass branch is communicated with an inlet of a flue gas circulation pipeline (such as a coil pipe) arranged in the generator 5 (specifically, a heat source interface of the generator can be used);
the generator 5 is provided with an inlet of a flue gas circulation pipeline and is also communicated with an air outlet (used for flowing out medium-temperature flue gas after heat exchange treatment) of the flue gas heat exchanger 1 (not shown in the figure);
it should be noted that, for the present invention, the heat source of the generator 5 in the absorption heat pump is divided into three streams, which are the middle temperature flue gas after the organic rankine cycle flue gas heat exchanger 1, the part of the high temperature flue gas bypassed in front of the flue gas heat exchanger 1, and the middle temperature pressurized air at the outlet of the turbocharger.
In particular, an outlet of a flue gas circulation pipeline arranged in the generator 5 is communicated with a low-temperature flue gas heat exchanger 15 through a first hot water heat exchanger 13;
the generator 5 has an outlet of a charge air circulation line which communicates with a charge air cooler 16 via a second hot water heat exchanger 14.
The cooling water outlet of the first condenser 3 is respectively communicated with the cooling water inlets of the low-temperature flue gas heat exchanger 15 and the charge air cooler 16;
cooling water outlets of the low-temperature flue gas heat exchanger 15 and the charge air cooler 16 are communicated with a cooling water inlet of the evaporator 8 after converging through a hollow connecting pipeline;
a working medium inlet of the evaporator 8 is communicated with a working medium outlet of the second condenser 6 through an expansion valve 7;
a working medium inlet of the second condenser 6 is communicated with a working medium outlet of the generator 5;
and a working medium outlet of the evaporator 8 is communicated with a working medium inlet of the absorber 9.
In particular, a first working medium outlet at the top of the absorber 9 is communicated with a first inlet of a solution heat exchanger 12 through a valve 10;
a second working medium outlet of the absorber 9 is communicated with a second inlet of the solution heat exchanger 12 through a solution pump 11;
a first outlet of the solution heat exchanger 12 is communicated with a first inlet of the solution heat exchanger 12 through an internal connecting coil;
a first outlet of the solution heat exchanger 12 is communicated with a first working medium inlet of the generator 5;
a second outlet of the solution heat exchanger 12 is communicated with a second inlet of the solution heat exchanger 12 through an internal connecting coil;
and a second outlet of the solution heat exchanger 12 is communicated with a second working medium inlet of the generator 5.
In particular, the hot water in the absorber 9 is independent and is not connected with other parts of the system, and the hot water is directly supplied to users.
For the present invention, it should be noted that the flue gas of the internal combustion engine 100 passes through the flue gas heat exchanger 1 of the organic rankine cycle, and then continues to be introduced into the generator 5 of the absorption heat pump to heat the solution. Meanwhile, a flue gas bypass branch is arranged in front of the organic Rankine cycle flue gas heat exchanger 1 and used for taking a part of high-temperature flue gas as a heat source in the generator 5 so as to regulate and control heat entering the generator 5, and therefore the low-temperature heat absorption capacity of the absorption heat pump evaporator 8 and the high-temperature heat absorption capacity of the generator 5 are balanced.
The cold fluid in the low temperature flue gas heat exchanger 15 and the charge air cooler 16 on the flue gas and charge air flow paths are both cooling water in the organic rankine cycle. After passing through the first condenser 3 of the organic working medium, the cooling water in the organic Rankine cycle is divided into two paths which are connected in parallel, and the two paths respectively pass through the low-temperature flue gas heat exchanger 15 and the charge air cooler 16 and then are converged into a strand of cooling water.
In the invention, the organic Rankine cycle heats the organic working medium by recovering the waste heat of the high-temperature section of the partial flue gas of the internal combustion engine so as to push the expansion machine 2 to do work for power generation and provide electric energy for users; working medium exhaust steam after acting is cooled in the first condenser 3, pressurized by the working medium pump 4 and conveyed into the flue gas heat exchanger 1 again to be heated and evaporated by flue gas.
In the invention, the generator 5 of the absorption heat pump absorbs the middle-temperature section heat of the pressurized air at the outlet of the turbocharger 101, the middle-temperature section heat of the flue gas of the internal combustion engine after passing through the flue gas heat exchanger 1 in the organic Rankine cycle, and part of the high-temperature flue gas heat bypassing the flue gas heat exchanger 1, and the waste heat is used as the driving heat source of the absorption heat pump. The by-pass high-temperature flue gas is mainly used for regulating and controlling the heat absorption capacity of the generator 5, so that the by-pass high-temperature flue gas is balanced with the low-temperature heat absorption capacity of the evaporator 8 of the absorption heat pump. The evaporator 8 of the absorption heat pump needs to absorb low-temperature heat, so the condensation heat of the organic Rankine cycle and the low-temperature section waste heat of the flue gas and the pressurized air are used as low-temperature heat sources of the absorption heat pump.
In the invention, the low-temperature cooling water of the organic Rankine cycle firstly takes away the condensation heat of the organic working medium through the first condenser 3, and then is divided into two parts: one stream recovers the low-temperature section heat of the flue gas through the low-temperature flue gas heat exchanger 15, and the other stream recovers the low-temperature section heat of the pressurized air through the pressurized air cooler 16. Then, the two cooling water streams are converged again and continuously pass through the evaporator 8 of the absorption heat pump, and simultaneously, the low-temperature waste heat carried by the cooling water streams is transferred to the absorption heat pump to be used as a low-temperature heat source of the absorption heat pump.
In the invention, a first hot water heat exchanger 13 is arranged between a generator 5 of an absorption heat pump and a low-temperature flue gas heat exchanger 15 on a flue gas flow path and is used for absorbing the heat of the flue gas at a medium-low temperature section and generating hot water for use; on the flow path of the pressurized air, a second hot water heat exchanger 14 is also arranged between the generator 5 of the absorption heat pump and the pressurized air cooler 16 and is used for absorbing the heat of the medium-low temperature section of the pressurized air and generating the hot water for use.
For the invention, any two mutually communicated components are communicated through a hollow connecting pipeline.
It should be noted that, aiming at the problems in the prior art, the invention provides a novel waste heat recovery system coupled by various technologies according to the principle of energy utilization according to quality and cascade utilization and the specific requirements of users on energy utilization, and by fully and reasonably utilizing the waste heat energy of each temperature section of flue gas and pressurized air and deeply utilizing the condensation heat of organic Rankine cycle, the utilization rate of the waste heat of the internal combustion engine is greatly improved, and the waste heat of the internal combustion engine is fully utilized. The effects of energy conservation and emission reduction are achieved.
For the waste heat recovery system provided by the invention, most of the waste heat of the high-temperature section of the flue gas of the internal combustion engine is recovered through the evaporator of the organic Rankine cycle. Then, the residual heat of the high-temperature section of the other small part of the flue gas, the residual heat of the medium-temperature section of the residual flue gas and the residual heat of the medium-temperature section of the pressurized air are used as heat sources of a generator in the absorption heat pump. The flue gas and the pressurized air in the middle-low temperature section are used for heating domestic hot water, and finally the flue gas and the pressurized air in the low temperature section are used as low-temperature heat sources of the heat absorption type heat pump.
The generator of the absorption heat pump is driven by the high-temperature section waste heat of a small part of flue gas and the medium-temperature section waste heat of the flue gas and the pressurized air; the low-temperature heat source of the absorption heat pump is provided by the condensation heat of the organic Rankine cycle and the low-temperature section heat of the flue gas and the pressurized air. The waste heat recovery system can fully utilize different heat sources of the internal combustion engine in a gradient manner according to the energy quality, and the overall energy efficiency of the internal combustion engine is obviously improved.
In order to more clearly understand the technical scheme of the invention, the invention is further illustrated by the following detailed description of a preferred embodiment in combination with the attached drawings.
The temperature of the smoke outlet of a natural gas fuel internal combustion engine for power generation is about 500 ℃. The heat source is connected to a flue gas heat exchanger 1 in the organic Rankine cycle and is used as a heat source of the organic Rankine cycle. The high-temperature smoke heats the organic working medium into high-temperature and high-pressure gas, and then the working medium flows into the expander 2 to expand to do work to generate power so as to supply power to users. The expander 2 is connected with the condenser 3, so that the working medium after doing work is cooled into liquid. The working medium pump 4 is connected behind the first condenser 3 and used for pressurizing the working medium and conveying the working medium to the flue gas heat exchanger 1 again.
After the flue gas is subjected to heat exchange by the flue gas heat exchanger 1 of the organic Rankine cycle, the outlet temperature is about 180 ℃, and the flue gas can be used as a driving heat source of the absorption heat pump. Therefore, the flue gas is continuously introduced into the generator 5 of the absorption heat pump to heat the solution. A flue gas bypass branch is arranged in front of the organic Rankine cycle flue gas heat exchanger 1 and used for introducing a part of high-temperature flue gas into the generator 5 of the absorption heat pump, so that the heat entering the generator 5 is regulated and controlled, and the low-temperature heat absorption capacity of the absorption heat pump evaporator 8 and the high-temperature heat absorption capacity of the generator 5 are balanced. The temperature of the pressurized air after exiting the turbocharger 101 is about 150 ℃ which is sufficient as a driving heat source for the absorption heat pump. Therefore, pressurized air is also passed into the generator 5 of the absorption heat pump to heat the solution. The solution in the generator 5 is heated to evaporate gaseous working medium, then flows into the second condenser 6, is condensed into liquid and gives out heat for users to use; the expansion valve 7 and the evaporator 8 are connected in turn after the second condenser 6, the pressure of the working medium drops after the expansion valve 7, and then the working medium is evaporated and absorbs the low-temperature heat of the cooling water from the organic Rankine cycle in the evaporator 8. An absorber 9 is connected downstream of the evaporator 8, where the working medium is absorbed by the solution and releases heat for the user.
The temperature of the flue gas and the pressurized air after passing through the generator 5 is reduced to about 100 ℃, and the flue gas and the pressurized air are respectively introduced into the first hot water heat exchanger 13 and the second hot water heat exchanger 14 to heat domestic hot water so as to provide hot water requirements for users. The temperature of the flue gas and the pressurized air coming out of the first hot water heat exchanger 13 and the second hot water heat exchanger 14 is about 50 ℃, and the flue gas and the pressurized air are respectively introduced into the low-temperature flue gas heat exchanger 15 and the pressurized air cooler 16, so that the flue gas and the pressurized air exchange heat with the cooling water at the outlet of the first condenser 3 in the organic Rankine cycle, and the low-temperature heat of the flue gas is transferred to the cooling water.
On the cooling water loop of the organic Rankine cycle, a condenser 3 is connected firstly, and then the cooling water loop is divided into two paths: one path is connected with a low-temperature flue gas heat exchanger 15, the other path is connected with a charge air cooler 16, and the two paths of heat sources are respectively used for recovering low-temperature waste heat of about 30-50 ℃. The two cooling water streams are merged again after the two low-temperature flue gas heat exchangers 15 and the charge air cooler 16, and continuously pass through the evaporator 8 of the absorption heat pump to release low-temperature waste heat to the evaporator 8.
In summary, compared with the prior art, the internal combustion engine cogeneration waste heat recovery system suitable for the distributed energy system provided by the invention is an efficient waste heat recovery system formed by coupling an absorption heat pump and a plurality of independent heat exchangers through an organic rankine cycle, and can fully utilize the waste heat of the flue gas and the pressurized air of the internal combustion engine according to the principle of energy utilization according to the quality, thereby saving precious energy, having good energy-saving and emission-reducing effects, being beneficial to popularization and application, and having great practical significance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. Internal-combustion engine cogeneration waste heat recovery system suitable for distributed energy system, its characterized in that, including organic rankine cycle, absorption heat pump and first hot water heat exchanger (13), second hot water heat exchanger (14), low temperature gas heater (15) and charge air cooler (16), wherein:
the organic Rankine cycle comprises a flue gas heat exchanger (1), an expander (2), a first condenser (3) and a working medium pump (4);
the absorption heat pump comprises a generator (5), a second condenser (6), an expansion valve (7), an evaporator (8), an absorber (9), a valve (10), a solution pump (11) and a solution exchanger (12);
for an organic Rankine cycle, wherein the air inlet of the flue gas heat exchanger (1) is communicated with the flue gas outlet of the internal combustion engine (100);
the working medium outlet of the flue gas heat exchanger (1) is communicated with the working medium inlet of the expansion machine (2);
the working medium outlet of the expander (2) is communicated with the working medium inlet of the first condenser (3);
the working medium outlet of the first condenser (3) is communicated with the inlet of the working medium pump (4);
the outlet of the working medium pump (4) is communicated with the working medium inlet of the flue gas heat exchanger (1);
for the absorption heat pump, an inlet of a pressurized air circulation pipeline arranged in the generator (5) is communicated with an air outlet of a turbocharger (101);
a flue gas bypass branch is communicated with the front of an air inlet of the flue gas heat exchanger (1) of the organic Rankine cycle;
the flue gas bypass branch is communicated with an inlet of a flue gas circulation pipeline arranged in the generator (5);
the generator (5) is provided with an inlet of a flue gas circulation pipeline and is also communicated with an air outlet of the flue gas heat exchanger (1).
2. The cogeneration waste heat recovery system of an internal combustion engine according to claim 1, wherein the generator (5) has an outlet of a flue gas circulation line which is communicated with the low-temperature flue gas heat exchanger (15) through the first hot water heat exchanger (13);
the generator (5) is internally provided with an outlet of a pressurized air circulation pipeline which is communicated with a pressurized air cooler (16) through a second hot water heat exchanger (14);
a cooling water outlet of the first condenser (3) is respectively communicated with a cooling water inlet of the low-temperature flue gas heat exchanger (15) and a cooling water inlet of the charge air cooler (16);
cooling water outlets of the low-temperature flue gas heat exchanger (15) and the charge air cooler (16) are communicated with a cooling water inlet of the evaporator (8) after converging through a hollow connecting pipeline;
a working medium inlet of the evaporator (8) is communicated with a working medium outlet of the second condenser (6) through an expansion valve (7);
the working medium inlet of the second condenser (6) is communicated with the working medium outlet of the generator (5);
the working medium outlet of the evaporator (8) is communicated with the working medium inlet of the absorber (9).
3. The cogeneration waste heat recovery system of an internal combustion engine according to claim 2, wherein the first working medium outlet at the top of the absorber (9) is communicated with the first inlet of the solution heat exchanger (12) through a valve (10);
a second working medium outlet of the absorber (9) is communicated with a second inlet of the solution heat exchanger (12) through a solution pump (11);
the first outlet of the solution heat exchanger (12) is communicated with the first inlet of the solution heat exchanger (12) through an internal connecting coil;
a first outlet of the solution heat exchanger (12) is communicated with a first working medium inlet of the generator (5);
the second outlet of the solution heat exchanger (12) is communicated with the second inlet of the solution heat exchanger (12) through an internal connecting coil;
and a second outlet of the solution heat exchanger (12) is communicated with a second working medium inlet of the generator (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911124284.4A CN110905618A (en) | 2019-11-18 | 2019-11-18 | Internal combustion engine cogeneration waste heat recovery system suitable for distributed energy system |
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| CN201911124284.4A CN110905618A (en) | 2019-11-18 | 2019-11-18 | Internal combustion engine cogeneration waste heat recovery system suitable for distributed energy system |
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| CN110905618A true CN110905618A (en) | 2020-03-24 |
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| CN201911124284.4A Pending CN110905618A (en) | 2019-11-18 | 2019-11-18 | Internal combustion engine cogeneration waste heat recovery system suitable for distributed energy system |
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| CN114000926A (en) * | 2021-11-01 | 2022-02-01 | 哈尔滨工程大学 | Exhaust and shunt two-stage waste heat utilization system of low-speed diesel engine |
| CN116481210A (en) * | 2023-05-23 | 2023-07-25 | 哈尔滨工程大学 | ORC and lithium bromide refrigeration dual-cycle gradient waste heat utilization system for exhaust energy split flow of low-speed diesel engine and working method |
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