Method for stable operation of wet flue gas desulfurization adopting white mud

Abstract

The invention discloses a method for applying white mud of paper-making to wet flue gas desulfurization and stable operation. The method comprises the steps that a TDS limiting value in a desulfurization system is found by measuring the SO3<2-> content in the slurry, and then TDS in the slurry is controlled through discharging waste water, and meanwhile slurry pre-oxidation measures are increased to ensure the oxidation of the slurry; the pH of the discharged waste water is adjusted to 9 by adopting the white mud, and the discharged waste water is sprayed into a gas flue, and evaporated to dryness by excess heat in the gas flue, meanwhile zero emission of the desulfurization waste water is achieved. The method fills up the world-wide technical blank of applying the white mud of paper-making to wet flue gas desulfurization and stable operation, and the technology is applicable to the operating conditions of low sulfur, middle sulfur and high sulfur. As the papermaking trash is used for wet flue gas desulfurization, the method has the advantages of realizing refuse reclamation, using waste to treat waste, maintaining long-term stable operation of the desulfurization system, and bringing immeasurable economic benefits for papermaking enterprises and thermal power plants.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource utilization and air pollutant control, and in particular relates to a method for stable operation of lime mud wet flue gas desulfurization. Background technique [0002] At present, the wet limestone-gypsum process is the most widely used desulfurization process for flue gas desulfurization in the world, accounting for about 83%. In my country, the limestone-gypsum desulfurization technology accounts for 78.26% of all desulfurization technologies. For the limestone-gypsum process, using limestone as a desulfurizer will consume a large amount of limestone and damage vegetation and ecological environment. Moreover, the consumption of desulfurizer limestone accounts for a large proportion of the total cost of desulfurization. For a long time, new desulfurizers have been the direction and focus of research. With the increasing pressure on economic benefits and environmental protection of ...

AI Technical Summary

Problems solved by technology

At present, less than 1% of units use white mud wet flue gas desulfurization

[0004] Papermaking lime mud is used in the wet flue gas desulfurization process due to its own composition characteristics, but because there are more impurities in the white mud, the pH of the white mud is higher, the content of Na, Mg, and K is higher, and the content of acidic insolubles is higher. , the desulfurization efficiency will decrease during operation, SO 2 The export concentration exceeds the standard, the sulfite content exceeds the standard, and the moisture content of gypsum is too high, which leads to the inability to operate stably for a long time. Solving this problem will help to further expand the white mud desulfurization market

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