Simultaneous desulphurization and denitration device for seawater smoke with membrane absorption method, as well as process of device

Abstract

The invention discloses a simultaneous desulphurization and denitration device for seawater smoke with a membrane absorption method. The device comprises at least one level of hydrophobic hollow fiber membrane absorber. A process of the device comprises steps as follows: firstly, nitric oxide in the smoke performs an oxidizing reaction to generate nitrogen dioxide, and the smoke and a seawater-based absorbent enter a shell pass and a tube pass of the hydrophobic hollow fiber membrane absorber respectively; SO2 and NOX in the smoke and the seawater-based absorbent perform fast interface reaction through membrane wall micropores, and a reaction product is moved away timely, so that simultaneous desulphurization and denitration of the smoke are realized; and a desulphurized and denitrated absorption liquid is treated and discharged after the absorption liquid is up to the standard. According to the process, two phases of gas and liquid are not directly contacted, the flowing speed is independently controlled, the adjusting range is wide, and problems such as serious equipment corrosion, heavy metal pollution hidden danger and the like, which exist in a conventional seawater desulfurization process, can be avoided; and impact of smoke containing high-concentration pollutants can be flexibly coped with, the degree of automation is high, the operation and the maintenance are convenient and fast, and the device and the process are suitable for upgrading and reconstruction of boilers in a coastal area and other desulfurization and denitration processes which produce waste gas.

Description

technical field [0001] The invention belongs to the intersecting field of air pollution control technology and application of membrane science and technology, and specifically relates to a process for simultaneously removing sulfur dioxide and nitrogen oxides in flue gas in one process using membrane absorption technology and seawater-based absorbent. 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 reduction denitrification technology (SCR). The desulfurization and denitrification ...

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Problems solved by technology

However, since the devices used are gas absorption equipment (such as packed towers, liquid column towers and spray towers, etc.), they still cannot get rid of the common problems of wet flue gas desulfurization: the gas-liquid two-phase is completely mixed and contacted, and the adjustment range is limited. Difficult to resist high concentrations of SO 2 and NO X The impact of the flue gas absorption process; the gas-liquid two-phase direct contact, the discharged flue gas contains a large amount of water vapor, and the equipment corrosion problem is serious

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