A low-temperature desulfurization and denitrification catalyst and flue gas low-temperature integrated desulfurization and denitrification method

Abstract

The invention relates to a low-temperature desulfurization and denitrification catalyst and a flue gas low-temperature integrated desulfurization and denitrification method. The catalyst is prepared by the following method: 1) mixing semi-coke particles and calcium oxide powder to obtain a mixture; 2) continuously passing the mixture into water Under the condition of mixed gas of steam and CO2, activate the carrier at high temperature; 3) Prepare the precursor solution containing copper nitrate, manganese nitrate and sodium chloride; 4) Use the equal volume impregnation method to impregnate the activated carrier with the precursor solution to The total loading mass of CuO and MnO2 on the activated carrier reaches 4.0%-6.0%, that is, it is obtained. The present invention uses a variety of activation modes to act synergistically, which greatly improves the specific surface area and pore volume of the semi-coke; in the presence of NaCl, CuO and MnO2 are loaded on the activation carrier, and the adsorption activity of the activated semi-coke cooperates with CuO and MnO2, and the obtained The catalyst has high desulfurization and denitrification efficiency, sulfur capacity and long catalytic activity period.

Description

technical field [0001] The invention belongs to the technical field of flue gas integrated desulfurization and denitrification, specifically relates to a low-temperature desulfurization and denitrification catalyst, and also relates to a flue gas low-temperature integrated desulfurization and denitrification method using the low-temperature desulfurization and denitrification catalyst. Background technique [0002] Soot-type pollution is the main feature of air pollution in my country. Coal-fired flue gas contains PM, SO 2 , ON X , Hg, CO 2 and other pollutants, among which SO 2 and ON X The large amount of discharge is the main factor for the formation of acid rain and photochemical smog, which not only causes serious damage to the ecological environment and social environment, such as causing soil acidification, slow growth of animals and plants, acidification of water bodies, and building corrosion, but also greatly endangers human health. Health, as SO in the atmosph...

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Problems solved by technology

The operating temperature window of this method is generally high, such as CuO / γ-Al 2 o 3 It has good simultaneous desulfurization and denitrification performance at 300°C-450°C, but when the operating temperature is low, the catalyst cannot achieve sufficient catalytic activity, and the desulfurization and denitrification reactions cannot be carried out. Therefore, a heating device is required to reheat the flue gas, and the cost is relatively high. High, and the catalyst has a small sulfur capacity and requires frequent regeneration, which further increases the loss of the catalyst and increases the cost

Solid adsorbents commonly used in solid adsorption catalytic methods include activated carbon, molecular sieve, silica gel, etc. Under the condition of oxygen and water in the flue gas, injecting ammonia into the activated carbon desulfurization system can remove SO at the same time 2 and ON X ; The operating temperature window of this method is relatively low, and it has a high removal efficiency between 120°C and 160°C. However, due to the high price and low strength of activated carbon, the loss in the adsorption and regeneration process is large, and it is easily affected by the gas in the flue gas. Oxygen oxidation limits its popularization and use

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