CN-121988137-A - Carbon capture waste heat recycling system based on high-temperature steam heat pump

CN121988137ACN 121988137 ACN121988137 ACN 121988137ACN-121988137-A

Abstract

The application relates to the technical field of flue gas carbon dioxide recovery and discloses a carbon capture waste heat recycling system based on a high-temperature steam heat pump, which comprises a carbon dioxide absorption tower, a desorption tower and a high-temperature steam heat pump, wherein the carbon capture waste heat recycling system is connected with the carbon dioxide absorption tower so as to absorb carbon dioxide, and the absorbed rich liquid is desorbed in the desorption tower; the high-temperature steam heat pump comprises an evaporator, a high-efficiency device, a compressor and a steam generator which are sequentially connected through pipelines, wherein an outlet of a heat medium side channel of the evaporator is connected with a carbon dioxide absorption tower, a refrigerant discharged from an outlet of a refrigerant channel of the evaporator sequentially enters a refrigerant side channel of the high-efficiency device, the compressor and the steam generator, the refrigerant subjected to heat exchange of the steam generator returns to the evaporator after passing through the heat medium side channel of the high-efficiency device, the steam generator is connected with a desorption tower, and heat of flue gas is recovered through the refrigerant to generate steam to be supplied to the desorption tower, so that energy loss of steam generation is reduced, and external energy consumption of a desorption process is reduced.

Inventors

LI YANAN
HUANG GUOHUA
LI SHAOFEI
DU WEIWEI
ZHAO JINZI
SUN WENQIAN
GU ZAIFENG

Assignees

同方节能工程技术有限公司
同方智慧能源有限责任公司

Dates

Publication Date: 20260508
Application Date: 20251127

Claims (10)

1. Carbon entrapment waste heat recovery utilizes system based on high temperature steam heat pump, its characterized in that includes: A carbon dioxide absorption tower and a desorption tower, wherein the carbon dioxide absorption tower is connected with the desorption tower to absorb carbon dioxide, and the absorbed rich liquid is desorbed in the desorption tower; The high-temperature steam heat pump comprises an evaporator, a high-efficiency device, a compressor and a steam generator which are sequentially connected through pipelines, wherein an outlet of a heat medium side channel of the evaporator is connected with a carbon dioxide absorption tower, an inlet of the heat medium side channel of the evaporator is connected with a flue gas source, a refrigerant discharged from an outlet of a refrigerant channel of the evaporator sequentially enters a refrigerant side channel of the high-efficiency device, the compressor and the steam generator, the refrigerant subjected to heat exchange by the steam generator returns to the evaporator after passing through the heat medium side channel of the high-efficiency device, the steam generator is connected with a desorption tower, water in the steam generator absorbs heat of the high-temperature refrigerant, the heat is directly evaporated into steam, and the steam is supplied to the desorption tower to heat rich liquid in the desorption tower.
2. The carbon capture waste heat recovery and utilization system according to claim 1, further comprising a direct contact heat exchanger, wherein a flue gas channel of the direct contact heat exchanger is connected to the carbon dioxide absorption tower, a circulating water channel of the direct contact heat exchanger is connected to a heat medium side channel of the evaporator, and the heat medium side channel in the evaporator exchanges heat with the refrigerant channel to recover flue gas waste heat through the circulating water and heat the refrigerant in the evaporator.
3. The carbon capture waste heat recovery system according to claim 1 or 2, wherein the high temperature steam heat pump further comprises a preheater provided with a water replenishing channel and a refrigerant channel, the refrigerant discharged from the steam generator enters the heat medium side channel of the high efficiency device after heat exchange with the water replenishing channel of the preheater, and the water replenishing channel of the preheater is connected with the steam generator to preheat water entering the steam generator by waste heat of the refrigerant.
4. The carbon capture waste heat recovery system according to claim 1 or 2, wherein the high temperature steam heat pump further comprises a reboiler, the reboiler being connected to the desorber, the steam generator being connected to the reboiler to heat the rich liquid of the desorber by the steam generated by the steam generator.
5. The carbon capture waste heat recovery system of claim 3, wherein the high temperature steam heat pump further comprises an economizer, the refrigerant passage of the preheater is connected to the inlet of the heat medium side passage of the economizer, and the outlet of the heat medium side passage of the economizer is connected to the heat medium side passage of the high efficiency; the pipeline that the economizer is connected with the high-efficiency device is provided with a branched air supplementing loop, a refrigerant outlet of the air supplementing loop is connected with an inlet of a refrigerant side channel of the economizer, an outlet of the refrigerant side channel of the economizer is connected with the compressor, and a heat medium side channel of the economizer exchanges heat with the air supplementing loop, so that the refrigerant after heat exchange in the air supplementing loop is supplemented into the compressor.
6. The carbon capture waste heat recovery system according to claim 1 or 2, wherein the high temperature steam heat pump further comprises a first expansion valve provided on a line connecting an inlet of the refrigerant passage of the evaporator and an outlet of the heat medium side passage of the high efficiency device.
7. The carbon capturing waste heat recycling system according to claim 1 or 2, wherein the carbon dioxide absorption tower is provided with a lean solution inlet, two rich solution passages are provided for connecting the carbon dioxide absorption tower and the desorption tower, one rich solution passage is provided with a lean and rich solution heat exchanger, a lean solution outlet of the desorption tower is connected with the lean and rich solution heat exchanger, and a lean solution outlet of the lean and rich solution heat exchanger is connected with a lean solution inlet of the carbon dioxide absorption tower so that the rich solution exchanges heat with the lean solution through the lean and rich solution heat exchanger.
8. The carbon capture waste heat recovery system of claim 1 or 2, further comprising an inter-stage cooler, wherein a cooling channel of the inter-stage cooler is connected to the first liquid outlet and the first liquid inlet of the carbon dioxide absorption tower, respectively, the first liquid outlet is located above the first liquid inlet, and the first liquid inlet is located above a flue gas inlet of the carbon dioxide absorption tower, so as to cool lean liquid in the absorption tower.
9. The carbon capture waste heat recovery and utilization system according to claim 1 or 2, further comprising a scrubber liquor cooler provided with a flue gas inlet and a flue gas outlet connected to the top of the carbon dioxide absorption tower, respectively, such that the flue gas is cooled by the scrubber liquor cooler.
10. The carbon capture waste heat recovery and utilization system according to claim 1 or 2, further comprising a gas-liquid separator, wherein the desorber is provided with a gas outlet, and the gas outlet of the desorber is connected to an inlet of the gas-liquid separator.

Description

Carbon capture waste heat recycling system based on high-temperature steam heat pump Technical Field The application relates to the technical field of flue gas carbon dioxide recovery, in particular to a carbon capture waste heat recycling system based on a high-temperature steam heat pump. Background CO 2 capture utilization and sequestration (Carbon Capture Utilization and Storage, abbreviated CCUS) is a necessary choice to achieve the goal. 40% -50% of CO 2 emission in China comes from coal-fired power plants, CO 2 trapping and utilization in the power plants are one of the most important technical paths for realizing carbon emission reduction in China, and CO 2 recycling and energy recycling can be realized in a conversion and utilization mode, so that economic benefits are generated. The prior alcohol amine method is widely used, and the alcohol amine solution has good absorption performance on carbon dioxide and can realize higher carbon dioxide trapping efficiency. However, a large amount of heat is consumed in the desorption process, resulting in high energy consumption of the whole carbon capture system and waste heat generated in the capture process. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows. The embodiment of the disclosure provides a carbon capture waste heat recycling system based on a high-temperature steam heat pump, which is matched with each device of the high-temperature steam heat pump, directly generates steam through absorbing waste heat of flue gas and supplies the steam to a desorption tower, so that the energy loss of the generated steam is reduced, the electric heating conversion efficiency is improved, and the external energy consumption in the desorption process is reduced. In some embodiments, a high temperature steam heat pump based carbon capture waste heat recovery system includes: The carbon dioxide absorption tower is connected with the desorption tower to absorb the flue gas, and the absorbed rich liquid is desorbed in the desorption tower; The high-temperature steam heat pump comprises an evaporator, a high-efficiency device, a compressor and a steam generator which are sequentially connected through pipelines, wherein an outlet of a heat medium side channel of the evaporator is connected with a carbon dioxide absorption tower, an inlet of the heat medium side channel of the evaporator is connected with a flue gas source, a refrigerant discharged from an outlet of a refrigerant channel of the evaporator sequentially enters a refrigerant side channel of the high-efficiency device, the compressor and the steam generator, the refrigerant subjected to heat exchange by the steam generator returns to the evaporator after passing through the heat medium side channel of the high-efficiency device, the steam generator is connected with a desorption tower, water in the steam generator absorbs heat of the high-temperature refrigerant, the heat is directly evaporated into steam, and the steam is supplied to the desorption tower to heat rich liquid in the desorption tower. Optionally, the carbon capturing waste heat recycling system further comprises a direct contact heat exchanger, a flue gas channel of the direct contact heat exchanger is connected with the carbon dioxide absorption tower, a circulating water channel of the direct contact heat exchanger is connected with a heat medium side channel of the evaporator, and the heat medium side channel in the evaporator exchanges heat with the refrigerant channel so as to recycle the flue gas waste heat through the circulating water and heat the refrigerant in the evaporator. Optionally, the high-temperature steam heat pump further comprises a preheater, the preheater is provided with a water supplementing channel and a refrigerant channel, the refrigerant discharged by the steam generator exchanges heat with water supplementing through the refrigerant channel of the preheater and then enters the heat medium side channel of the high-efficiency device, and the water supplementing channel of the preheater is connected with the steam generator so as to preheat water entering the steam generator through waste heat of the refrigerant. Optionally, the high temperature steam heat pump further comprises a reboiler, the reboiler is connected with the desorption tower, and the steam generator is connected with the reboiler to heat the rich li