Exhaust gas desulfurization process

Abstract

The invention relates to a process for exhaust gas desulfurization. After being subjected to dust collection and cooling, exhaust gas enters an absorption tower and is in reflux contact with a solution; the solution absorbs sulfides in the exhaust gas; purified gas is discharged from the top of the tower, and rich solution is exported from the bottom of the absorption tower through a rich solution pump; one part of the rich solution is returned to the middle part of the absorption tower for re-absorption, and the rest rich solution exchanges heat with a barren solution in a solution heat exchanger; the solution subjected to heat exchange is released into the upper part of a regeneration tower and is in reflux contact with rising steam so as to be regenerated; the regenerated barren solution passes through the solution heat exchanger, and then is cooled by a barren solution cooler and conveyed into the top of the absorption tower for the use as a solution; the gas discharged from the top of the regenerated tower enters a regenerated gas cooler and a regenerated gas separator to cool water vapor in the gas, and separated liquid drops are recycled and conveyed back into the system to maintain the system solution concentration; the regeneration separator discharges the regenerated gas.

Description

technical field [0001] The invention belongs to gas separation technology, and in particular relates to a desulfurization process of sulfur-containing flue gas and a desulfurization device thereof. Background technique [0002] SO 2 As one of the main gases of air pollution, it has attracted widespread attention. In order to effectively suppress the increasingly serious pollution of sulfur dioxide and nitrogen oxides to the atmospheric environment, countries around the world, especially developed countries, have made long-term unremitting efforts and developed more than 200 desulfurization and denitrification technologies. SO 2 Control technology can be divided into pre-combustion desulfurization, desulfurization during combustion and post-combustion desulfurization (also known as flue gas desulfurization). Among them, flue gas desulfurization (FGD) is currently the most widely used technology with the highest desulfurization efficiency. 2 The main technical means of emi...

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Problems solved by technology

[0005] However, due to the low sulfide content in the flue gas, the absorption liquid from the absorption tower did not reach its maximum absorption capacity, so it was sent for

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