A carbon dioxide capture or separation system coupled with low-temperature multiple-effect distillation technology

Abstract

A low temperature multiple-effect distillation technology coupled carbon dioxide capturing or separating system is characterized in that a liquid rich outlet of an absorption tower is connected with a low temperature multiple-effect distillation device, the low temperature multiple-effect distillation device is connected with an absorbent lean liquid storage tank, the concentrate rich liquid outlet of the distillation device is connected with a regeneration tower, and the regeneration tower and the outlet of the low temperature multiple-effect distillation device are connected with a gas-liquid separation tank; and the regeneration tower is connected with the lean liquid storage tank, the lean liquid storage tank is connected with the absorbent inlet of the absorption tower, a reboiler is arranged at the outer side of the bottom of the regeneration tower, and the outlet of a thermal compressor is connected with the first-effect steam inlet of the low temperature multiple-effect distillation device. The system can be applied in the fields of process gas purification, carbon dioxide emission reduction and the like; and a low temperature multiple-effect distillation technology is adopted before a CO2 rich liquid enters a desorption tower in order to carry out concentration treatment, so the participation of water in the rich liquid desorption process in the regeneration tower is reduced, the thermal load of the reboiler is reduced, and the decrease of the total energy consumption of the CO2 capturing or separating process can be realized relative to the increase of the energy consumption of the low temperature multiple-effect distillation device.

Description

technical field [0001] The invention belongs to the technical field of process gas purification and carbon dioxide emission reduction, and in particular relates to a carbon dioxide capture or separation system coupled with low-temperature multi-effect distillation technology. Background technique [0002] carbon dioxide (CO 2 ) is the main greenhouse gas that causes global warming, CO in the flue gas of coal-fired power plants 2 The capture and separation of carbon dioxide is an important area of ​​greenhouse gas emission reduction. In addition, there are also large amounts of CO in industrial fields such as steelmaking, cement, and chemical industry (such as ammonia synthesis, hydrogen production, and natural gas purification). 2 capture or separation process. The absorption method is currently the most mature CO method and is expected to achieve large-scale commercial application. 2 capture separation technology. [0003] Traditional CO 2 The energy consumption and o...

AI Technical Summary

Problems solved by technology

[0003] Traditional CO 2 The energy consumption and operation cost of the absorption separation technology in the application process are very high, especially the steam heat energy consumed by the regeneration of the absorbent accounts for the vast majority of the energy consumption of the entire system

The main reason for the high energy consumption is that the high-temperature desorption of the rich liquid is used, and the proportion of water in the rich liquid is relatively high (generally above 70wt%). 2 The heating and volatilization of water in the process of high temperature desorption will consume a lot of energy

To solve the problem of high energy consumption in the absorption method, concentrate the rich liquid to change the water environment in the regeneration process, and develop a new type of CO 2 Capture or separation system is one of the effective ways to reduce operating costs

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