Multi-stream circulation desulfurization system and multi-stream circulation desulfurization method

Abstract

The invention discloses a multi-flow-path circulating desulfurization system. The multi-flow-path circulating desulfurization system comprises an absorption column, a barren liquor tank, a rich liquor tank and a desorption column, wherein the rich liquor tank is communicated with a rich liquor inlet of the desorption column; a column kettle barren liquid outlet of the desorption column is communicated with the barren liquor tank; the barren liquor tank is further communicated with a top liquid phase inlet of the absorption column; a column kettle liquid phase outlet of the absorption column is communicated with at least two liquid flow pipelines which are arranged in parallel; at least one of the liquid flow pipelines is communicated with the rich liquor tank, while the other one is communicated with the barren liquor tank. The invention further discloses a multi-flow-path circulating desulfurization method which comprises the following steps: utilizing the absorption column to absorb and remove sulfur dioxide from the smoke, utilizing the multiple liquid flow pipelines which are arranged in parallel to selectively convey the absorption liquid discharged by the absorption column, utilizing the desorption column to desorb and regenerate the rich liquor of the absorption liquid discharged by the absorption column, and finally circulating and returning the desorbed and regenerated barren liquor of the absorption liquid to the absorption column. The multi-flow-path circulating desulfurization system disclosed by the invention is reasonable in structure, energy-saving, capable of reducing consumption and low in cost, and can be well adapted to the concentration fluctuation of the sulfur dioxide in the smoke.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a desulfurization system and method which need to use heat energy (such as steam) to participate in realizing the cycle regeneration of absorption liquid. Background technique [0002] my country is one of the countries most seriously polluted by sulfur dioxide. Because the acid rain formed by sulfur dioxide emission has brought serious damage to industry and agriculture, the country loses more than hundreds of billions of yuan every year. With the continuous improvement of national environmental protection regulations and the continuous improvement of the country's emphasis on sulfur dioxide pollution, more and more desulfurization technologies have sprung up like mushrooms after rain. [0003] At present, the industrialized desulfurization technologies at home and abroad mainly include gypsum method, sodium alkali method, and cyclic absorption desu...

AI Technical Summary

Problems solved by technology

For some flue gases with large fluctuations and poor regularity of sulfur dioxide concentration, the circulation desulfurization technology often has problems such as low desulfurization absorbent saturation and high average steam consumption, which brings great cost pressure to enterprises

Especially for some non-ferrous smelting processes with intermittent feeding, during the entire smelting cycle, there will be a long period of time when the flue gas is in a sulfur-depleted period (the concentration of sulfur dioxide is only: 600-2000mg / Nm 3 ), and to ensure the normal operation of the absorption tower, a certain amount of lean liquid spraying must be ensured, resulting in unsaturated absorption of the absorption liquid, large desorption amount of the rich liquid, and finally resulting in a large volume of desorption tower equipment and excessively high steam consumption per unit of sulfur dioxide

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