Process and system for ammonia spraying flue gas desulfurization and sulfur dioxide recovery

Abstract

The invention discloses a process and a system for ammonia spraying flue gas desulfurization and sulfur dioxide recovery. The process comprises the following steps: (1) mixing flue gas which is subjected to dedusting and temperature reduction with atomized ammonia to carry out desulfurization; (2) demisting the desulfurized flue gas; (3) evaporating the desulfurized solution which is obtained in the process of demisting at the temperature of between 50 and 130 DEG C to obtain mother solution comprising concentrated ammonium sulfate and mixed gas of ammonia and sulfur dioxide; and (4) after sulfur dioxide in the mixed gas of ammonia and sulfur dioxide is absorbed by adsorption solution, making ammonia enter a flue gas channel to carry out atomization and desulfurization, desorbing pregnant solution obtained after the adsorption solution absorbs sulfur dioxide to obtain a sulfur dioxide product and making desorbed and regenerated barren solution enter an adsorption tower for recycling. The system comprises the flue gas channel, an ammonia sprayer, a demister, an evaporator, the adsorption tower and a desorption tower. By using the method, a desulfurizing tower is saved, and the method can fulfill the desulfurization aim only by ammonia atomization through a transmission flue channel, has simple process and low cost, is convenient to operation and improves the processing efficiency.

Description

technical field [0001] The invention relates to a technology suitable for desulfurization of boiler flue gas and sintering flue gas of iron and steel plants and recovery of part of sulfur dioxide, which belongs to the technical field of flue gas purification. Background technique [0002] Flue gas desulfurization is currently the main method to control atmospheric sulfur dioxide pollution. One of the industries with the largest sulfur dioxide emissions is thermal power generation, which widely uses the limestone gypsum desulfurization process. Other industries, such as the iron and steel industry, lack effective desulfurization measures due to the large air volume of sintering flue gas and low concentration of sulfur dioxide. [0003] At present, flue gas desulfurization mainly adopts limestone gypsum method, ammonia method and other desulfurization methods. Limestone gypsum desulfurization has major disadvantages. Desulfurization devices are prone to fouling and clogging, ...

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at the problems of low mass transfer efficiency, high operating cost, serious secondary pollution and resource consumption of traditional separation equipment existing in the existing sulfur dioxide removal technology in flue gas, and provides a method with simple process, low cost, convenient operation and high processing efficiency. Ammonia Spray Flue Gas Desulfurization and Sulfur Dioxide Recovery Process

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