Wet desulphurization technology and system using coal ash

Abstract

The invention discloses a wet desulphurization technology and system using coal ash. The wet desulphurization technology using coal ash mainly comprises the following steps: (1) collecting superfine coal ash in flue gas which is generated after boiler combustion, and conveying the collected superfine coal ash to a liquid preparation tank; (2) fully reacting activating oxides in the superfine coal ash with a certain proportion of water in the liquid preparation tank so as to obtain an alkaline solution; (3) conveying the alkaline solution to a desulphurization circulating pool; and (4) enabling the alkaline solution in the desulphurization circulating pool to circularly flow between a desulphurization tower and the desulphurization circulating pool so as to realize the removal of sulfur in the flue gas. The wet desulphurization system using coal ash comprises a dust collector, the liquid preparation tank, the desulphurization circulating pool and the desulphurization tower. According to the technology and the system, the removal of sulfur in the flue gas is realized by directly using the activating oxides contained in the coal ash. The desulfurized coal ash solid liquid generated after desulphurization can be reused, so that the comprehensive cyclic utilization of the coal ash is realized, and the utility value of the coal ash is fully exerted; and the wet desulphurization technology and system using the coal ash are particularly suitable for the removal of sulfur of sulfur dioxide in flue gas of small and medium-sized industrial pulverized coal boilers with the raw coal sulfur content of below 1.0%.

Description

technical field [0001] The present invention relates to the technical field of flue gas desulfurization of pulverized coal combustion, specifically refers to a wet desulfurization process using fly ash and its system, which is especially suitable for the sulfur dioxide removal from the flue gas of small and medium-sized industrial pulverized coal boilers with a sulfur content of less than 1.0% in raw coal. Desulfurization application. Background technique [0002] Pulverized coal industrial boiler is a new type of furnace developed in my country in recent years, and fly ash is the main solid waste discharged from pulverized coal industrial boiler. With the continuous development of industry, the technology of pulverized coal industrial boilers has been continuously matured, and has the advantages of fast start-up, wide load adjustment range, high degree of automation and low energy consumption, and has been put into use in industrial and civil fields more and more. How to d...

AI Technical Summary

Problems solved by technology

How to deal with the fly ash produced after combustion and how to achieve comprehensive recycling is extremely critical in industrial production. At present, fly ash is mainly used as an admixture for concrete and in the field of red brick production. In terms of treatment and comprehensive recycling There has been no good solution

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