Method for controlling aerosol generation in absorbing process by ammonia process of desulfurization

Abstract

The invention discloses a method for controlling aerosol generation in absorbing process by an ammonia process of desulfurization. Sulfurdioxide is removed from flue gas with an absorption circulatingliquid containing ammonium sulfite in order to control generation of aerosol during absorption in the ammonia process of desulfurization. Efficient desulphurization and dust removal are realized by graded solution component control and reaction condition control, ammonia escape and generation of aerosol in the absorbing process are controlled during efficient desulfurization, initially cooled andpurified flue gas comes into contact with the absorption circulating liquid and a fine particle washing circulating liquid in sequence, the components of each stage of solution and reaction temperature are controlled, synergistical control of absorption, oxidization and concentration is realized, the absorbing efficiency in the absorbing process is ensured, ammonia escape and aerosol are controlled, meanwhile energy consumption is lowered, and long-term stable running of the device is realized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for controlling the generation of aerosol in the absorption process through ammonia desulfurization. Background technique [0002] All countries in the world emit sulfur dioxide to varying degrees. China has a huge amount of sulfur dioxide emissions, which has had a huge impact on the environment and society. Huge economic losses have seriously affected China's ecological environment and people's health. [0003] At present, there are hundreds of relatively mature desulfurization technologies, among which the wet desulfurization process is the most widely used, accounting for about 85% of the world's total installed desulfurization capacity. Common wet flue gas desulfurization technologies include limestone-gypsum method, double alkali method, sodium carbonate method, ammonia method, magnesium oxide method, etc. Ammonia desulfurization is a...

AI Technical Summary

Problems solved by technology

The method has 1) the concentration of the absorption liquid is low, and it is only suitable for low-sulfur flue gas

2) The control of ammonia escape and aerosol generation in the absorption process is not paid attention to, and a reheater needs to be installed to eliminate white smoke

3) Crystallization is affected by drying air volume and dust content, and the amount of crystallization is small and unstable.

The process does not specify the solution composition, pH value and absorption temperature, and still cannot completely control the escape of ammonia and the generation of aerosols from the source, and the investment in oxidation washing is large, the operating cost is high, and there are certain safety risks

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