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Multi-stage low-temperature waste heat recovery system based on supercritical carbon dioxide

A waste heat recovery system, carbon dioxide technology, applied in the direction of indirect carbon dioxide emission reduction, heat exchanger, indirect heat exchanger, etc., can solve the waste heat loss of waste heat flue gas, can not effectively recycle low and low temperature waste heat, regenerative heat exchanger Low efficiency and other issues

Active Publication Date: 2021-08-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
  • Claims
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Problems solved by technology

The system aims to solve the problems of a large amount of flue gas waste heat loss and the ineffective recovery and utilization of low-temperature waste heat due to the low efficiency of the regenerative heat exchanger in the existing waste heat recovery system and the waste heat is only used in a single stage.

Method used

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  • Multi-stage low-temperature waste heat recovery system based on supercritical carbon dioxide
  • Multi-stage low-temperature waste heat recovery system based on supercritical carbon dioxide

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Embodiment 1

[0028] A multi-stage low-temperature waste heat recovery system based on supercritical carbon dioxide provided by a preferred embodiment of the present invention includes a carbon dioxide high-pressure turbine 1, a carbon dioxide medium-pressure turbine 2, a carbon dioxide low-pressure turbine 3, a primary reheater 4, two Secondary reheater 5, first stage regenerator 6, second stage main regenerator 7, third stage regenerator 8, second stage auxiliary regenerator 13, low pressure economizer 14, high pressure economizer 15. The second-stage sub-condenser 16, the second-stage sub-compressor 17, the low-temperature heat exchanger 18, the air preheater 30, and the third-stage main condenser 31;

[0029]The carbon dioxide high-pressure turbine 1, the carbon dioxide medium-pressure turbine 2, and the carbon dioxide low-pressure turbine 3 are connected in sequence, and the boiler primary reheater 4 is connected between the carbon dioxide high-pressure turbine 1 and the carbon dioxide ...

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Abstract

The invention discloses a multi-stage low-temperature waste heat recovery system based on supercritical carbon dioxide. The multi-stage low-temperature waste heat recovery system comprises a supercritical carbon dioxide multi-stage waste heat recovery circulating system and a novel heat exchange system for providing a cold source for the whole system; and the novel heat exchange system comprises a first-stage novel heat exchanger, carbon dioxide of a low-temperature heat exchanger exchanges heat with a circulating cooling working medium through the first-stage novel heat exchanger, and carbon dioxide discharged from the first-stage novel heat exchanger enters a second-stage novel heat exchanger through a large-temperature-difference heat exchange unit and exchanges heat with circulating cooling liquid, and finally the low-temperature carbon dioxide working medium is formed and returns to the low-temperature heat exchanger to be subjected to heat exchange with the low-temperature flue gas for next-stage circulation. According to the low-temperature multi-stage waste heat recovery system with the supercritical carbon dioxide as the working medium, after heat exchange is conducted at the position of a first-stage heat regenerator 6, the high-temperature working medium is divided into two paths, and the waste heat utilization efficiency is improved.

Description

technical field [0001] The invention belongs to the field of waste heat recovery, and relates to a multi-stage low-temperature waste heat recovery system based on supercritical carbon dioxide. Background technique [0002] At present, waste heat power generation is a good way to solve energy recovery, which not only saves energy but also is beneficial to environmental protection. Waste heat power generation is mainly a technology that converts excess heat energy generated in the production process into electrical energy. According to the survey, the total waste heat resources of various industries account for about 17% to 67% of their total fuel consumption, and the recyclable waste heat resources are about 60% of the total waste heat resources. At present, high-temperature and medium-temperature waste heat can be recycled and utilized very well. The low-temperature waste heat recovery technology is complicated, and it is difficult to recover low-temperature waste heat. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D21/00F23L15/00F01K25/10
CPCF28D21/0014F23L15/00F01K25/103Y02E20/34
Inventor 徐尚龙郑师晨颛孙壮志叶鑫龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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