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Efficient engine waste heat recovery and heat exchange system and method

A heat exchange system and waste heat recovery technology, applied in engine components, combustion engines, machines/engines, etc., can solve the problems of a single input end, low heat exchange of the evaporator, and low thermal efficiency of the system, so as to improve thermal efficiency and improve thermal efficiency. Efficient, compact effect

Pending Publication Date: 2020-11-20
BEIJING U BRIDGE CHAOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the evaporative heat exchange system of motor vehicles adopts a single heat source for heat exchange, and its input end is single, the heat exchange capacity of the evaporator is low, and the thermal efficiency of the system is low.
Limited to the existing functional structure of the motor vehicle and the load limit, the space layout and system weight of the WHR system are also greatly restricted

Method used

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  • Efficient engine waste heat recovery and heat exchange system and method
  • Efficient engine waste heat recovery and heat exchange system and method
  • Efficient engine waste heat recovery and heat exchange system and method

Examples

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Embodiment 1

[0031] This embodiment is an engine waste heat recovery heat exchange system, such as figure 1 shown. figure 1 The single-line arrow in the middle indicates the flow direction of the engine exhaust gas, and the double-line arrow indicates the flow direction of the working fluid in the waste heat recovery cycle. This embodiment includes: an evaporator 3 that is provided with two mutually isolated exhaust gas flow passages and can centrally recover the heat of EGR exhaust gas and SCR exhaust gas. It is connected with the exhaust pipe 101 of the engine 1 and the outlet pipe 901 of the SCR8. The evaporator is provided with two exhaust gas outlets 303, 304, and one exhaust gas outlet is connected with the intake pipe 102 of the engine, that is, from the exhaust The exhaust gas that enters the evaporator through the pipe enters the evaporator after sufficient heat exchange and then enters the engine intake pipe again for EGR circulation, and the other exhaust gas outlet is connecte...

Embodiment 2

[0049] This embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment on the evaporator. The diffusion chamber of the evaporator described in this embodiment is divided into two independent diffusion chambers; the collection chamber is also divided into two independent collection chambers; the two independent diffusion chambers The two independent collection chambers are respectively connected with independent heat exchange tube groups to form two independent exhaust gas flow channels for EGR exhaust gas and SCR exhaust gas, and the two sets of mutually independent heat exchange tube groups are arranged in the same evaporation chamber .

[0050] In this embodiment, the EGR exhaust gas and the SCR exhaust gas pass through two mutually isolated passages in the evaporator, and perform heat exchange in the same evaporation chamber, and use the heat exchange to evaporate the working medium in the evaporation chamber, and output it to the turb...

Embodiment 3

[0052] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the working medium collection end of the evaporator. The working medium collection end of the evaporator described in this embodiment is connected to a bypass valve 9 in pipelines, and the two output ends of the bypass valve are respectively connected to the input end 701 of the turbine and the input end 601 of the condenser, as shown in FIG. figure 2 shown.

[0053] In some cases, for example, when the engine is idling or running at low speed, when the superheated steam produced by the evaporator is not enough to do work, this embodiment sets a bypass valve to bypass the turbine so that the superheated steam produced by the evaporator It is sent directly to the condenser to reduce the loss of the turbine.

[0054] The bypass valve can also be arranged between the output end of the turbine and the input end of the condenser, and the bypass pipe connects the...

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Abstract

The invention relates to an efficient engine waste heat recovery and heat exchange system and method. The efficient engine waste heat recovery and heat exchange system comprises an evaporator. The evaporator is provided with two heat source inlets and is connected with an exhaust pipe of an engine and an output pipe of an SCR through a valve set, one waste gas exhaust port of the evaporator is connected with a gas inlet pipe of the engine through a pipeline, and the other waste gas exhaust port of the evaporator is connected with the atmosphere. The working medium input end of the evaporator is sequentially connected with a working medium pump, an expansion water tank, a condenser, a turbine and the working medium collecting end of the evaporator. EGR tail gas and SCR tail gas are subjected to heat exchange in the same evaporator, the structure is more compact, and the heat efficiency of the evaporator is improved. A heat exchanger commonly used in a traditional engine recirculation system is replaced by the evaporator, heat in engine waste gas is absorbed through the phase change process that media are changed into gas from liquid so as to push the turbine to drive a generator togenerate electricity, the heat in the engine waste gas is fully utilized to generate electricity, and the energy-saving and emission-reducing effects are achieved. The system and the method provide asolution for improving the heat engine efficiency of the engine.

Description

technical field [0001] The invention relates to a high-efficiency engine waste heat recovery heat exchange system and method, is an auxiliary device and method for an automobile engine exhaust system, and is an environmental protection facility and method. Background technique [0002] The traditional waste heat recovery cycle, or "WHR" technology, is a technology that recovers waste heat from engine exhaust to do work or generate electricity. It can reduce the emission of exhaust pollutants (similar to the engine recirculation system (EGR)), and at the same time recover the waste heat of the engine to do work or generate electricity, improve the thermal efficiency of the engine, and make the vehicle more fuel-efficient during driving. Since the waste heat recovery process needs to exchange heat between the exhaust gas and the heat exchange working medium through the evaporator, and at the same time heat the working medium to a specific superheated steam, the thermal efficie...

Claims

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Application Information

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IPC IPC(8): F01K23/10F01N5/02F02M26/23
CPCF01K23/10F01K23/065F01N5/02F02M26/23Y02T10/12
Inventor 景建周朱燕阎佳奇
Owner BEIJING U BRIDGE CHAOYANG
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