Sequencing batch limestone slurry wet desulfurization technique

Abstract

The present invention provides an order-batch-mode limestone mortar wet desulphurization process, in particular relates to a high-efficient limestone desulphurization process that adopts the limestone mortar as the desulphurization agent, and adopts the order-batch alternative absorption reaction, and adopts the high-efficient desulphurization tower as the desulphurization device, and adopts lower pH value, lower liquid-gas ratio and economical desulphurization rate, and adopts the desulphurization waste slag as the byproduct. Smoke enters into the high-efficient desulphurization device, and a group of limestone mortar is adopted as absorption agent for the smoke to be desulphurized, until the pH value is decreased to a pre-determined value, and the smoke is temporarily withdrawn and the absorption is stopped; the absorption solution is continued to be reacted with the tiny particle of CaCO3, until the pH value is returned to the original value, and then another group of limestone mortar is filled to be desulphurized until the pH decreases to the pre-determined value; the mortar is filled at one group by another group for alternative absorption and after the mortar is reacted with the CaCO3, a new group of limestone mortar is replaced; the waste mortar is discharged after being processed; the waste slag is processed after being dehydrated. The order-batch-mode limestone mortar wet desulphurization process saves the investment, and has low operation expense, and is simple to be operated and managed, and has wide application, and resolves the scale formation problem of the tower and pool.

Description

Technical field [0001] The invention relates to the fields of environmental protection and chemical industry, and belongs to waste gas purification technology, in particular to a sequencing batch limestone slurry wet desulfurization process. Background technique [0002] Since the industrial revolution, a large amount of fossil fuels have been used, and a large amount of carbon dioxide and sulfur dioxide have been emitted. The carbon dioxide in the atmosphere causes the "greenhouse effect" and warms the climate, which constitutes long-term harm; the accumulation of sulfur dioxide forms "acid rain", which endangers the normal survival and life of surface animals and plants. Desulfurization technology has become one of the key technologies for human survival and development. [0003] There are many types of desulfurization technologies, and only a dozen are widely used in domestic and foreign industries. Wet desulfurization technology is the most researched and widely used de...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the problems of relatively high cost of limestone-gypsum wet desulfurization, high requirements for flue gas dust removal, complex system management and operation, and difficulty in application of small and medium-sized flue gas and fuel oil flue gas desulfurization devices, the invention provides a sequencing batch limestone slurry wet desulfurization The desulfurization process uses the cheapest limestone powder / slurry as the absorbent, the most efficient mass transfer tower as the absorption device, with lower pH, lower liquid-gas ratio and economical desulfurization rate, and discards desulfurization by-products Simplify the four major process systems of the prior art flue gas system, absorbent preparation and supply system, sulfur dioxide absorption system, and desulfurization by-product treatment system, so that the desulfurization system has low investment, simple operation and management, and wider application

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