Resource reclamation type membrane flue gas desulphurization and denitration device and its technology

Abstract

The invention discloses a resource reclamation type membrane flue gas desulphurization and denitration device which comprises at least one hydrophobic hollow fiber membrane absorber. A technology of the device is as follows: nitric oxide in flue gas is firstly subjected to an oxidation reaction to generate nitrogen dioxide, and the flue gas and an alkaline absorbent respectively enter a shell side and a tube side of the hydrophobic hollow fiber membrane absorber; SO2 and NOX in the flue gas permeate membrane wall micropores and undergo a rapid interfacial reaction with the alkaline absorbent so as to realize purification of the flue gas; and the alkaline absorbent is recycled to form a high-concentration salt-making mother liquor which is processed to prepare sulfate and nitrate. According to the technology, flow velocity of gas-liquid two-phase is independently controlled, and operating range is wide; non-direct contact between the flue gas and the absorbent can avoid heavy metal in flue dust and flue gas from entering the absorbent, resource recycling of pollutants in the flue gas is realized, and a high-purity by-product with high added value is obtained; and the technological process has high degree of automation, is economic and highly efficient and causes no secondary pollution.

Description

technical field [0001] The invention belongs to the intersecting field of air pollution control technology and membrane science and technology application, and specifically relates to a method of using membrane absorption technology and alkaline absorbent to remove sulfur dioxide and nitrogen oxides in flue gas simultaneously in one process, and obtain A process for reusing high-quality sulfate and nitrate fertilizer by-products. Background technique [0002] Sulfur dioxide and nitrogen oxides in the atmosphere mainly come from the combustion of fossil fuels such as industrial waste gas and coal and oil. In our country at present and for a long period of time in the future, it is still necessary to provide heat and power resources through coal combustion. [0003] Currently, industrialized SO 2 / NO X Most of the combined desulfurization process is desulfurization by limestone-gypsum flue gas desulfurization system first, and then denitrification by selective catalytic red...

AI Technical Summary

Problems solved by technology

However, the device used in this process is traditional gas absorption equipment (spray tower), which still cannot get rid of the common problems of wet flue gas desulfurization and denitrification: the gas-liquid two-phase is completely mixed during the flue gas absorption process, and the flow rate adjustment range of the two fluids is limited , it is difficult to resist high concentration SO 2 and NO X The impact of the impact, the exhausted flue gas contains a large amount of water vapor and acid mist, and the equipment corrosion problem is serious

At the same time, the by-product inorganic salt recovered by this process is mixed with soot and heavy metals from the flue gas, which is of poor quality and has the problem of secondary pollution

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