CN211975090U - Vehicle-mounted Rankine cycle waste heat recovery system - Google Patents
Vehicle-mounted Rankine cycle waste heat recovery system Download PDFInfo
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- CN211975090U CN211975090U CN201922387187.6U CN201922387187U CN211975090U CN 211975090 U CN211975090 U CN 211975090U CN 201922387187 U CN201922387187 U CN 201922387187U CN 211975090 U CN211975090 U CN 211975090U
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Abstract
The utility model discloses an on-vehicle rankine cycle waste heat recovery system, include: the low-grade organic Rankine cycle device comprises an engine (6), a low-grade expansion machine (7), a low-grade condenser (9), a low-grade working medium pump (10) and a low-grade preheater (11); the low-grade organic working medium enters the low-grade preheater (11) to exchange heat with a coolant in a cooling flow channel of the engine (6); the high-grade organic Rankine cycle device comprises a high-grade evaporator (1), a high-grade expansion machine (2), a high-grade condenser (4) and a high-grade working medium pump (5), wherein high-grade organic working medium of the high-grade organic Rankine cycle device enters the high-grade evaporator (1) to exchange heat with smoke discharged by an engine (6). The vehicle-mounted Rankine cycle waste heat recovery system improves the waste heat recovery and utilization efficiency of the engine.
Description
Technical Field
The utility model relates to an on-vehicle rankine cycle waste heat recovery system equipment technical field especially relates to an on-vehicle rankine cycle waste heat recovery system.
Background
The traditional vehicle-mounted organic Rankine cycle only recycles the waste heat of high-grade flue gas. Although the temperature of a low-grade heat source (a cylinder sleeve or cylinder sleeve water of an engine) using a coolant such as water is low, the proportion of the waste heat of the cylinder sleeve water of the engine to the total waste heat is large, and the waste heat is not recycled, so that the effective utilization of the low-grade heat source and the waste heat recycling efficiency of the engine cannot be met.
Therefore, how to improve the waste heat recycling efficiency of the engine is a technical problem that needs to be solved by those skilled in the art at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an on-vehicle rankine cycle waste heat recovery system to improve the waste heat recovery and utilization efficiency of engine.
In order to solve the technical problem, the utility model provides an on-vehicle rankine cycle waste heat recovery system, include:
the low-grade organic Rankine cycle device comprises an engine, a low-grade expander, a low-grade condenser, a low-grade working medium pump and a low-grade preheater; the low-grade organic working medium enters the low-grade preheater to exchange heat with a coolant in a cooling runner of the engine;
the high-grade organic Rankine cycle device comprises a high-grade evaporator, a high-grade expander, a high-grade condenser and a high-grade working medium pump, wherein the high-grade organic working medium of the high-grade organic Rankine cycle device enters the high-grade evaporator to exchange heat with smoke exhausted by an engine.
Optionally, in the vehicle-mounted rankine cycle waste heat recovery system, the low-grade organic rankine cycle device further includes a low-grade evaporator;
and the low-grade organic working medium enters the low-grade evaporator to exchange heat with the smoke discharged by the engine.
Optionally, in the vehicle-mounted rankine cycle waste heat recovery system, the flue gas discharged by the engine sequentially passes through the high-grade evaporator and the low-grade evaporator.
Optionally, in the vehicle-mounted rankine cycle waste heat recovery system, the flue gas discharged by the engine flows into the high-grade evaporator and the low-grade evaporator through two branch pipelines respectively.
Optionally, in the vehicle-mounted rankine cycle waste heat recovery system, two low-grade connecting branch pipelines are arranged between an outlet of the low-grade preheater and an inlet of the low-grade expander, and a low-grade control valve is arranged on each of the two low-grade connecting branch pipelines;
and a low-grade heating part for heating the low-grade organic working medium is arranged on one low-grade connecting branch pipeline.
Optionally, in the vehicle-mounted rankine cycle waste heat recovery system, the low-grade heating component is a heat accumulator; and the heat storage heat source of the low-grade heating component is the smoke discharged by the engine.
Optionally, in the vehicle-mounted rankine cycle waste heat recovery system, a first flue gas control valve is disposed on a low-grade flue gas inlet pipeline of the low-grade heating component.
Optionally, the vehicle-mounted rankine cycle waste heat recovery system further includes a control cabinet, and the control cabinet includes a first control unit that is in communication connection with the low level control valve and the first flue gas control valve and controls an opening degree.
Optionally, the vehicle-mounted rankine cycle waste heat recovery system further comprises a high-grade heat regenerator, wherein the high-grade heat regenerator is arranged on the first high-grade heat exchange tube and the second high-grade heat exchange tube and is used for exchanging heat for fluid in the first high-grade heat exchange tube and the second high-grade heat exchange tube;
the first high-grade heat exchange tube is a connecting tube between the high-grade expander and an inlet of the high-grade condenser; the second high-grade heat exchange tube is a connecting tube between the outlet of the high-grade condenser and the engine.
Optionally, the vehicle-mounted rankine cycle waste heat recovery system further comprises a low-grade heat regenerator, wherein the low-grade heat regenerator is arranged on the first low-grade heat exchange tube and the second low-grade heat exchange tube and is used for exchanging heat for fluid in the first low-grade heat exchange tube and the second low-grade heat exchange tube;
the first low-grade heat exchange tube is a connecting tube between the low-grade expander and an inlet of the low-grade condenser; the second low-grade heat exchange tube is an outlet tube of the low-grade condenser.
The utility model provides an on-vehicle rankine cycle waste heat recovery system need not to change current structure, directly carries out the heat transfer with low-grade organic working medium and coolant for the heat of low-grade organic working medium absorption coolant (the cylinder liner water of engine). Namely, the low-grade organic Rankine cycle device and the high-grade organic Rankine cycle device are arranged, so that the high-grade organic Rankine cycle device is used for carrying out heat exchange and waste heat recovery on the smoke exhausted by the engine, and the low-grade organic Rankine cycle device is used for carrying out heat exchange and waste heat recovery on the engine. On the basis of not influencing the recovery of the waste heat of the flue gas, the waste heat of the engine is recovered, the effective utilization of a low-grade heat source is met, and the waste heat recovery and utilization efficiency of the engine is improved.
Drawings
Fig. 1 is a schematic structural diagram of the vehicle-mounted rankine cycle waste heat recovery system provided by the present invention.
Detailed Description
The utility model discloses a core provides an on-vehicle rankine cycle waste heat recovery system to improve the waste heat recovery and utilization efficiency of engine.
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, an embodiment of the present invention provides a vehicle-mounted rankine cycle waste heat recovery system, which includes a low-grade organic rankine cycle device and a high-grade organic rankine cycle device. The low-grade organic Rankine cycle device comprises an engine 6, a low-grade expander 7, a low-grade condenser 9, a low-grade working medium pump 10 and a low-grade preheater 11; the low-grade organic working medium enters the low-grade preheater 11 to exchange heat with the coolant in the cooling flow channel of the engine 6. The high-grade organic Rankine cycle device comprises a high-grade evaporator 1, a high-grade expansion machine 2, a high-grade condenser 4 and a high-grade working medium pump 5, wherein high-grade organic working media of the high-grade organic Rankine cycle device enter the high-grade evaporator 1 to exchange heat with smoke discharged by an engine 6.
The embodiment of the utility model provides an on-vehicle rankine cycle waste heat recovery system need not to change current structure, directly carries out the heat transfer with low-grade organic working medium and coolant for the heat of low-grade organic working medium absorption coolant (the cylinder liner water of engine). That is, by providing the low-grade organic rankine cycle device and the high-grade organic rankine cycle device, the high-grade organic rankine cycle device is used to recover heat exchange and waste heat of the flue gas discharged from the engine 6, and the low-grade organic rankine cycle device is used to recover heat exchange and waste heat of the engine 6. On the basis of not influencing the recovery of the waste heat of the flue gas, the waste heat of the engine 6 is recovered, the effective utilization of a low-grade heat source is met, and the waste heat recovery and utilization efficiency of the engine is improved.
The coolant in the cooling flow passage of the engine 6 may be cooling water or cooling oil.
It can be understood that the high-grade working medium pump 5 provides the circulating power of the high-grade organic rankine cycle device and the evaporation pressure required by the high-grade evaporator 1. The low-grade working medium pump 10 provides the circulating power of the low-grade organic Rankine cycle device and the evaporation pressure required by the low-grade organic working medium in the engine 6. The specific arrangement positions of the high-grade working medium pump 5 and the low-grade working medium pump 10 are not limited.
In this embodiment, the working medium outlet of the high-grade evaporator 1 is connected to the inlet of the high-grade expander 2, the outlet of the high-grade expander 2 is connected to the inlet of the high-grade condenser 4, the outlet of the high-grade condenser 4 is connected to the inlet of the high-grade working medium pump 5, and the outlet of the high-grade working medium pump 5 is connected to the working medium inlet of the high-grade evaporator 1. Firstly, high-grade organic working media are heated and evaporated into high-temperature and high-pressure gas in a high-grade evaporator 1 by high-grade flue gas, and the high-temperature and high-pressure gas enters a high-grade expansion machine 2. The gaseous working medium expands in the high-grade expander 2 to work and is changed into gas with lower pressure and lower temperature, and then the gas enters the high-grade condenser 4 to be condensed and is changed into liquid working medium with lower pressure and lower temperature. The liquid working medium enters a high-grade working medium pump 5, is pressurized in the high-grade working medium pump 5 and then enters a high-grade evaporator 1.
In this embodiment, a working medium outlet of the low-grade preheater 11 is connected to an inlet of the low-grade expander 7, an outlet of the low-grade expander 7 is connected to an inlet of the low-grade condenser 9, an outlet of the low-grade condenser 9 is connected to an inlet of the low-grade working medium pump 10, and an outlet of the low-grade working medium pump 10 is connected to a working medium inlet of the low-grade preheater 11. The low-grade organic working medium enters the low-grade preheater 11 to exchange heat with the coolant in the cooling flow channel of the engine 6 to absorb heat.
However, since the temperature of the low-grade heat source (such as cylinder liner water of the engine) is low, the cylinder liner water of the engine is directly used as the heat source, so that the pressure of the evaporator in the low-grade organic rankine cycle device is low to heat and evaporate the low-grade organic working medium, and the efficiency of the low-grade expander 7 is low and the output work is also low. In order to improve the output power, the low-grade organic rankine cycle device further comprises a low-grade evaporator 12; the low-grade organic working medium enters a low-grade evaporator 12 to exchange heat with the smoke discharged by the engine 6.
Firstly, the coolant of the engine 6 comes out of the engine 6 and enters the low-grade preheater 11, and in the low-grade preheater 11, the coolant of the engine 6 exchanges heat with the low-grade organic working medium. At this time, the low-grade organic working medium with higher temperature coming out of the low-grade preheater 11 enters the low-grade evaporator 12. In the low-grade evaporator 12, the low-grade organic working medium with higher temperature is heated and evaporated by the smoke discharged by the engine 6 into a gaseous working medium with higher pressure and temperature, and the gaseous working medium enters the low-grade expansion machine 7. The gaseous working medium expands in the low-grade expansion machine 7 to work and is changed into gas with lower pressure and lower temperature, and then the gas enters the low-grade condenser 9 to be condensed and is changed into liquid working medium with lower pressure and lower temperature. The liquid working medium enters a low-grade working medium pump 10, is pressurized in the low-grade working medium pump 10 and then enters a low-grade preheater 11. Through the arrangement, the low-grade organic working medium is preheated by the coolant (cylinder sleeve water of the engine), and after the heat of the coolant is absorbed by the low-grade organic working medium, the temperature of the low-grade organic working medium is further increased through the low-grade evaporator 12, so that the stable operation of the low-grade organic Rankine cycle device is ensured on the basis of recycling the low-grade heat source.
Preferably, in one embodiment, the flue gas from the engine 6 passes through the high-grade evaporator 1 and the low-grade evaporator 12 in sequence. Namely, the heat source of the low-grade evaporator 12 is secondary flue gas, and the recovery rate of the high-grade heat source is further improved.
Of course, in another embodiment, the flue gas from the engine 6 flows into the high-grade evaporator 1 and the low-grade evaporator 12 through two branch pipes. That is, the heat source of the low-grade evaporator 12 is the primary flue gas discharged from the engine 6. The recycling rate of the high-grade heat source can be optimized through the flow of the flue gas in the two branch pipelines.
Two low-grade connecting branch pipelines are arranged between the outlet of the cooling flow channel and the inlet of the low-grade expansion machine 7, and low-grade control valves are arranged on the two low-grade connecting branch pipelines; one low-grade connecting branch pipeline is provided with a low-grade heating part for heating the low-grade organic working medium. By arranging the low-grade heating parts and adjusting the opening degree of the low-grade control valves on the two low-grade connecting branch pipelines, the flow of the low-grade organic working medium which is shunted and passes through the low-grade heating parts is achieved, when the temperature of the engine 6 body is low, the low-grade heating parts adjust the flow of the low-grade organic working medium, the stability of the low-grade organic working medium for absorbing heat is effectively ensured, and the operation stability of the low-grade organic Rankine cycle device is further ensured.
In this embodiment, the low-grade heating member is a heat accumulator. Through the arrangement, the energy-saving effect is further improved. Of course, the low-grade heating member may be provided as an electric heater or the like.
Preferably, the heat storage heat source of the low-grade heating component is flue gas discharged by the engine 6. Of course, the heat storage heat source of the low-grade heating member may be the engine 6 body or another type, and is not particularly limited herein. In this embodiment, the flue gas discharged from the engine 6 is divided, and the first part flows into the high-grade evaporator 1, and the second part flows into the low-grade heating element, so that the temperature of the heat storage heat source (the flue gas discharged from the engine 6) of the low-grade heating element is ensured, and the heat storage effect is further ensured. The flue gas flowing out of the high-grade evaporator 1 can also be used as a heat storage source of the low-grade heating component.
In order to realize the heat storage control of the low-grade heating component, a first flue gas control valve is arranged on a low-grade flue gas inlet pipeline of the low-grade heating component.
The vehicle-mounted Rankine cycle waste heat recovery system in the embodiment further comprises a control cabinet, wherein the control cabinet comprises a first control unit which is in communication connection with the low-grade control valve and the first smoke control valve and controls the opening degree. The first control unit adjusts the opening degrees of the two low-level control valves and the first smoke control valve, so that automatic control is realized. Wherein, the opening degree of two low-grade control valves and a first flue gas control valve can be according to the temperature and the flow of the low-grade organic working medium flowing out of the engine 6.
Furthermore, two high-grade connecting branch pipelines are arranged between the working medium outlet of the high-grade evaporator 1 and the inlet of the high-grade expansion machine 2, and high-grade control valves are arranged on the two high-grade connecting branch pipelines; one high-grade connecting branch pipeline is provided with a high-grade heating part for heating the high-grade organic working medium. Through setting up the high-grade heater block, through adjusting the aperture of the high-grade level control valve on two high-grade connection branch pipelines, realized the reposition of redundant personnel and through the flow of the high-grade organic working medium of high-grade heater block, when the flue gas temperature or the flow of engine 6 exhaust are lower, the high-grade heater block is adjusted the flow of high-grade organic working medium, has effectively ensured the stability that high-grade organic working medium absorbs the heat, has further ensured the operating stability of high-grade organic rankine cycle device.
The high-grade heating component is a heat accumulator. Through the arrangement, the energy-saving effect is further improved. Of course, the high-grade heating member may be provided as an electric heater or the like.
Preferably, the heat storage heat source of the high-grade heating component is flue gas discharged by the engine 6. Of course, the heat storage heat source of the high-grade heating member may be the engine 6 body or another type, and is not particularly limited herein. In this embodiment, the flue gas discharged from the engine 6 is split, and the first portion flows into the high-grade evaporator 1, the second portion flows into the low-grade heating member, and the third portion flows into the high-grade heating member, so that the temperature of the heat storage heat source (the flue gas discharged from the engine 6) of the high-grade heating member is ensured, and the heat storage effect is further ensured. The flue gas flowing out of the high-grade evaporator 1 can also be used as a heat storage source of the high-grade heating component.
In order to realize the heat storage control of the high-grade heating component, a second flue gas control valve is arranged on a high-grade flue gas inlet pipeline of the high-grade heating component.
The vehicle-mounted Rankine cycle waste heat recovery system in the embodiment further comprises a control cabinet, wherein the control cabinet comprises a second control unit which is in communication connection with the high-grade control valve and the second smoke control valve and controls the opening degree. The second control unit adjusts the opening degrees of the two high-level control valves and the second smoke control valve, so that automatic control is realized. Wherein, the opening degree of the two high-grade control valves and the second flue gas control valve can be according to the temperature and the flow of the high-grade organic working medium flowing out of the high-grade evaporator 1.
In this embodiment, the vehicle-mounted rankine cycle waste heat recovery system further includes a high-grade heat regenerator 3, and the high-grade heat regenerator 3 is disposed on the first high-grade heat exchange tube and the second high-grade heat exchange tube, and is used for exchanging heat for fluid in the first high-grade heat exchange tube and the second high-grade heat exchange tube; the first high-grade heat exchange pipe is a connecting pipe between the high-grade expander 2 and the inlet of the high-grade condenser 4; the second high-grade heat exchange pipe is a connecting pipe between the outlet of the high-grade condenser 4 and the engine 6.
The high-grade organic working medium is a liquid working medium after passing through a high-grade condenser 4, and the liquid working medium is pressurized by a high-grade working medium pump 5 and then enters a high-grade heat regenerator 3; the high-grade organic working medium is a gas working medium after passing through the high-grade evaporator 1, and the gas working medium is expanded by the high-grade expander 2 to do work and then enters the high-grade heat regenerator 3. At the moment, the liquid working medium entering the high-grade heat regenerator 3 through the high-grade working medium pump 5 exchanges heat with the gas working medium entering the high-grade heat regenerator 3 through the high-grade expander 2, so that the liquid working medium exchanges heat and is heated, and then enters the high-grade evaporator 1 to exchange heat with the exhaust gas of the engine 6 and is heated again; and the gas working medium is subjected to heat exchange and temperature reduction, so that the energy which does not participate in the expansion work of the high-grade expander 2 in the gas working medium can be utilized again.
Further, the vehicle-mounted Rankine cycle waste heat recovery system further comprises a low-grade heat regenerator 8, wherein the low-grade heat regenerator 8 is arranged on the first low-grade heat exchange tube and the second low-grade heat exchange tube and is used for exchanging heat for fluid in the first low-grade heat exchange tube and the second low-grade heat exchange tube; the first low-grade heat exchange pipe is a connecting pipe between the low-grade expander 7 and the inlet of the low-grade condenser 9; the second low-grade heat exchange tube is an outlet tube of the low-grade condenser 9. As shown in fig. 1, the outlet pipe of the low-grade condenser 9 is a connecting pipe between the outlet of the low-grade condenser 9 and the low-grade preheater 11.
The low-grade organic working medium is a liquid working medium after passing through a low-grade condenser 9, and the liquid working medium enters a low-grade heat regenerator 8 after being pressurized by a low-grade working medium pump 10; the low-grade organic working medium is a gas working medium after passing through the engine 6 or the low-grade preheater 11, and the gas working medium also enters the low-grade heat regenerator 8 after passing through the low-grade evaporator 12 and performing expansion work through the low-grade expander 7. At the moment, the liquid working medium entering the low-grade heat regenerator 8 through the low-grade working medium pump 10 exchanges heat with the gas working medium entering the low-grade heat regenerator 8 through the low-grade expander 7, so that the liquid working medium exchanges heat and is heated, and then enters the low-grade preheater 11 for heat exchange and is heated again; and the gas working medium is subjected to heat exchange and temperature reduction, so that the energy which does not participate in the expansion work of the low-grade expander 7 in the gas working medium can be utilized again.
It is right above the utility model provides a vehicle-mounted rankine cycle waste heat recovery system has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (9)
1. A vehicle-mounted Rankine cycle waste heat recovery system is characterized by comprising:
the low-grade organic Rankine cycle device comprises an engine (6), a low-grade expander (7), a low-grade condenser (9), a low-grade working medium pump (10), a low-grade preheater (11) and a low-grade evaporator (12); a low-grade organic working medium of the low-grade organic Rankine cycle device enters the low-grade preheater (11) to exchange heat with a coolant in a cooling channel of the engine (6), the low-grade organic working medium enters the low-grade evaporator (12) to exchange heat with flue gas discharged by the engine (6), and the low-grade organic working medium with higher temperature discharged from the low-grade preheater (11) enters the low-grade evaporator (12);
the high-grade organic Rankine cycle device comprises a high-grade evaporator (1), a high-grade expansion machine (2), a high-grade condenser (4) and a high-grade working medium pump (5), wherein high-grade organic working medium of the high-grade organic Rankine cycle device enters the high-grade evaporator (1) to exchange heat with smoke discharged by an engine (6).
2. The vehicle Rankine cycle waste heat recovery system according to claim 1, wherein flue gas emitted by the engine (6) passes through the high-grade evaporator (1) and the low-grade evaporator (12) in sequence.
3. The on-board Rankine cycle waste heat recovery system according to claim 1, wherein flue gas emitted by the engine (6) flows into the high-grade evaporator (1) and the low-grade evaporator (12) through two branch ducts, respectively.
4. The vehicle Rankine cycle waste heat recovery system according to claim 1, wherein two low-grade connecting branch pipelines are arranged between the outlet of the low-grade preheater (11) and the inlet of the low-grade expander (7), and a low-grade control valve is arranged on each of the two low-grade connecting branch pipelines;
and a low-grade heating part for heating the low-grade organic working medium is arranged on one low-grade connecting branch pipeline.
5. The vehicle Rankine cycle waste heat recovery system according to claim 4, wherein the low-grade heating component is a heat accumulator; the heat storage heat source of the low-grade heating component is flue gas discharged by the engine (6).
6. The vehicle Rankine cycle waste heat recovery system according to claim 5, wherein a first flue gas control valve is arranged on a low-grade flue gas inlet pipeline of the low-grade heating component.
7. The on-board Rankine cycle waste heat recovery system according to claim 6, further comprising a control cabinet including a first control unit communicatively connected to the low-level control valve and the first flue gas control valve and controlling an opening degree.
8. The vehicle Rankine cycle waste heat recovery system according to any one of claims 1-7, further comprising a high-grade heat regenerator (3), wherein the high-grade heat regenerator (3) is arranged on the first high-grade heat exchange tube and the second high-grade heat exchange tube and is used for exchanging heat of fluid in the first high-grade heat exchange tube and the second high-grade heat exchange tube;
the first high-grade heat exchange pipe is a connecting pipe between the high-grade expander (2) and an inlet of the high-grade condenser (4); the second high-grade heat exchange tube is a connecting tube between the outlet of the high-grade condenser (4) and the engine (6).
9. The vehicle Rankine cycle waste heat recovery system according to any one of claims 1-7, further comprising a low-grade heat regenerator (8), wherein the low-grade heat regenerator (8) is disposed on the first low-grade heat exchange tube and the second low-grade heat exchange tube and is used for exchanging heat with fluid in the first low-grade heat exchange tube and the second low-grade heat exchange tube;
the first low-grade heat exchange pipe is a connecting pipe between the low-grade expander (7) and an inlet of the low-grade condenser (9); the second low-grade heat exchange tube is an outlet tube of the low-grade condenser (9).
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| CN201922387187.6U CN211975090U (en) | 2019-12-25 | 2019-12-25 | Vehicle-mounted Rankine cycle waste heat recovery system |
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| CN201922387187.6U CN211975090U (en) | 2019-12-25 | 2019-12-25 | Vehicle-mounted Rankine cycle waste heat recovery system |
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