Method for wet removal of sulfur and mercury components in flue gas containing mercury and sulfur by urea phosphate

Abstract

The invention relates to the technical field of purification treatment of flue gases, in particular to a method for wet removal of sulfur and mercury components in flue gas containing mercury and sulfur by urea phosphate. The method comprises the following steps: researching removal of the sulfur and mercury components in the flue gas containing the mercury and the sulfur; adding the urea phosphate for removing, adsorbing with activated carbon and then carrying out spraying treatment by adopting a sulfur and mercury removing agent prepared from the urea phosphate and pyrolusite. Therefore, liquid subjected to sulfur removal and mercury removal can be used for producing fertilizer, further the efficiency of the sulfur removal and the mercury removal for the flue gas containing the sulfur and the mercury is improved, added values of the sulfur removal and the mercury removal are also increased, and the cost of the sulfur removal and the mercury removal for the flue gas is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas purification treatment, in particular to a method for wet removal of sulfur and mercury components in flue gas containing mercury and sulfur by using urea phosphate. Background technique [0002] At present, my country's sulfur dioxide emissions have ranked among the top in the world, becoming the third largest acid rain area in the world, and the damage caused by acid rain has gradually increased every year, reaching more than 100 billion yuan. The source of sulfur dioxide is mainly sintering flue gas, and Most of the sintering flue gas also contains mercury components, so that when sulfur dioxide enters the air and forms acid rain, mercury components also enter the environment, and mercury is a toxic heavy metal component, which enters the environment with rainwater Afterwards, it is easy to enter the organism and convert into methylmercury in the organism, and methylmercury can greatly affect th...

AI Technical Summary

Problems solved by technology

[0002] At present, my country's sulfur dioxide emissions have ranked among the top in the world, becoming the third largest acid rain area in the world, and the damage caused by acid rain has gradually increased every year, reaching more than 100 billion yuan. The source of sulfur dioxide is mainly sintering flue gas, and Most of the sintering flue gas also contains mercury components, so that when sulfur dioxide enters the air and forms acid rain, mercury components also enter the environment, and mercury is a toxic heavy metal component, which enters the environment with rainwater Afterwards, it is easy to enter the organism and convert into methylmercury in the organism, and methylmercury can greatly affect the metabolism of the organism, leading to threats to the health of the organism

[0003] Therefore, it is necessary to desulfurize and demercurize sintering flue gas; for desulfurization, most of the desulfurization at home and abroad is still dominated by wet desulfurization, and wet desulfurization accounts for more than 85%. Limestone-gypsum method and sodium desulfurization are generally used Alkali method, etc. These methods not only have high investment and operating costs, but also easily scale and block equipment during the desulfurization process, and the price of by-products after desulfurization is low, and the waste residue has little application value and is likely to cause secondary pollution; therefore, desulfurization technology is gradually Appeared semi-dry and dry desulfurization process

For mercury removal, it mainly involves mercury removal before combustion, mercury removal during combustion and mercury removal after combustion. The mercury removal in these three stages mainly involves mercury removal by technology without dedusting equipment, mercury removal by adsorbent, catalytic oxidation mercury removal, Wet flue gas desulfurization device for mercury removal, solution absorption method for mercury removal, however, for mercury removal in flue gas, the technology is still in an unsatisfactory state, and in industry, most of them use activated carbon adsorption to remove mercury, so that mercury The emission of mercury has been effectively controlled, but due to the high price of activated carbon, the cost of mercury removal using a large amount of activated carbon is relatively high