An improved method for controlling aerosol generation in an absorption process of ammonia desulfurization

Abstract

An improved method for controlling aerosol generation in an absorption process of ammonia desulfurization is disclosed. The absorption reaction temperature and the process gas oxygen and water contents are controlled, and an absorption circulating liquid containing ammonium sulfite is utilized to remove sulfur dioxide in flue gas in order to control aerosol generation during the absorption processof ammonia desulfurization. Through graded solution composition control and reaction condition control, high-efficiency desulfurization and dust removal are achieved, ammonia escape and aerosol generation in the absorption process are controlled at the same time of high-efficiency desulfurization, the flue gas purified and cooled preliminary by pre-washing circulating liquid is brought into contact with absorption circulating liquid and micro particle washing circulating liquid in order, components of solutions of each stage, the reaction temperature and flue gas components are controlled, synergistic control of absorption, oxidation and concentration is achieved, and therefore, investment and energy consumption are reduced at the same time of ensuring the absorption efficiency of the absorption process, controlling ammonia escape and controlling aerosol generation, and long-term stable operation of equipment is achieved.

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. In 2014, the total amount of sulfur dioxide emissions was 19.74 million tons. In 2017, the total amount of sulfur dioxide emissions was 8.754 million tons, causing huge economic losses and seriously affecting 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 tec...

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 clearly control the oxygen content of the flue gas, the control method of the absorption temperature, and the treatment of the absorption wastewater. Further optimization is still needed to clarify the process control indicators and control methods to provide support for controlling the aerosols generated during the ammonia desulfurization absorption process from the source.

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