Double-oxidation, double-loop and double-demisting desulfurization tower and processing device

Abstract

The invention relates to the technical field of environmental protection equipment, in particular to a double-oxidation, double-loop and double-demisting desulfurization tower and a processing device for carrying out desorption and recovery treatment for sulfur dioxide in flue gas from a boiler, wherein the tower body is divided into four sections, comprising an oxidation section, an oxidation evaporation saturation section, a purification absorption section and a demisting section from bottom to top; a flue gas inlet is arranged at the middle of the tower; the top of the tower is provided with a flue gas outlet and a dewatering and demisting section for desorbing water vapor; the bottom of the tower is provided with the oxidation section for collecting reaction products and carrying out ventilation oxidation for the reaction products; the dewatering and demisting section is provided with a device for demisting, filling and spraying process water; and the oxidation section is provided with a circulating liquid outlet which is connected to a spray system through a circulating pump. The invention has the beneficial effects of simple structure, convenient operation and maintenance, environmental protection, good double demisting effect, and low ammonia consumption; and in the invention, double oxidation efficiency reaches 99%, double circulation desulfuration efficiency is more than 98%, demisting effect is good, ammonia consume is low and the product ammonium sulfate reaches the standard.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a double oxidation, double circuit, double defogging, triple double desulfurization and process device for removing and recovering sulfur dioxide in boiler flue gas. Background technique [0002] When the current ammonia desulfurization is applied to the desulfurization of coal-fired boiler flue gas, there are common problems such as high ammonia consumption, difficulty in eliminating aerosol, high cost of absorbing liquid treatment, and difficult operation. Usually ammonia flue gas desulfurization uses ammonia to absorb sulfur dioxide to generate ammonium sulfite, and then oxidizes it with air, but high-concentration ammonium sulfite cannot be quickly and completely oxidized into ammonium sulfate, but is oxidized at a lower concentration and then evaporated. The product obtained by the concentration process has a large amount of evaporation, a large en...

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Problems solved by technology

[0002] When the current ammonia desulfurization is applied to the desulfurization of coal-fired boiler flue gas, there are common problems such as high ammonia consumption, difficulty in eliminating aerosol, high cost of absorbing liquid treatment, and difficult operation.

Usually ammonia flue gas desulfurization uses ammonia to absorb sulfur dioxide to generate ammonium sulfite, and then oxidizes it with air, but high-concentration ammonium sulfite cannot be quickly and completely oxidized into ammonium sulfate, but is oxidized at a lower concentration and then evaporated. The product obtained by the concentration process has a large amount of evaporation, a large energy consumption, a long process, a large amount of equipment, a large area, and high operating costs. Complicated and difficult to maintain

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