Flue gas waste heat gradient utilization device and method capable of simultaneously capturing carbon and sulfur

Abstract

The invention relates to the field of carbon and sulfur trapping, in particular to a flue gas waste heat gradient utilization device and method capable of simultaneously trapping carbon and sulfur, the device comprising a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger, a sixth heat exchanger, a seventh heat exchanger, an absorption tower, a sulfur dioxide desorption tower and a carbon dioxide desorption tower; according to the device ,the heat supply network return water is used as a cold source, so that the consumption and consumption of circulating cooling water are reduced, carbon dioxide and sulfur dioxide are respectively removed and captured by the desorption tower at different temperatures, and the temperature of flue gas entering the absorption tower is reduced and the carbon dioxide absorption amount is increased through gradient cooling of the flue gas and gradient heating of the heat supply network return water; meanwhile, gradient utilization of flue gas waste heat is achieved, the heat utilization efficiency is improved, and the heat supply benefit is improved. Through stepped cooling of the ionic liquid, effective recycling of the ionic liquid is realized.

Description

technical field [0001] The invention relates to the field of carbon and sulfur capture, in particular to a device and method for cascaded utilization of flue gas waste heat for simultaneous capture of carbon and sulfur. Background technique [0002] The sharply increased carbon dioxide concentration will trigger a severe greenhouse effect, which in turn will lead to severe global warming and related natural disasters, melting glaciers and extreme climate. The development and application of carbon dioxide capture plays an important role in mitigating global warming and thus has received great attention. [0003] Similarly, sulfur dioxide produced by fossil fuel combustion poses a serious threat to human health and the ecological environment. How to effectively capture sulfur dioxide has attracted widespread attention from scholars at home and abroad. The capture of sulfur in the gas, and although the existing technology can achieve a certain purpose of recovery and preheatin...

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Problems solved by technology

[0004] The present invention proposes a flue gas waste heat cascade utilization device and method for simultaneous capture of carbon and sulfur to solve the problem that the prior art does not involve the capture of sulfur in the flue gas, the heat recovery rate is low, and the temperature of the heating network water provided is low. The problem

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