Energy-saving and synergizing wet desulfurization catalyst and using thereof

Abstract

The invention provides a desulphurization catalyst which can substantially improve desulphurization efficiency, reduce system obstruction and fouling, prevent foaming and overflow of a slurry pump and reduce energy consumption of system, and a limestone-gypsum wet desulphurization technology used for large-scale thermal power, belonging to the technical field of environment protection. The catalyst comprises components by weight percent: 40-70 % of organic polyprotic acid or sodium salt thereof, 0.1-5 % of transition metal salts, 5-15 % of a pH buffering agent, 0.05-2 % of a surfactant and 5-20 % of a scale inhibitor. The catalyst is characterized in that a synergist can be directly added into a filtrate pit of an absorbing tower, uniformly stirred and dissolved and then pumped into the absorbing tower; or the synergist can be mixed with a limestone powder into a certain concentration and then added. By using the flue gas desulphurization catalyst, buffer capacity of a pH value of the slurry is relatively good, an oxidation rate of sulfite is accelerated by more than 30 %, a desulphurization efficiency is improved by 10 %, residual CaCO3 in the gypsum is reduced to be less than 1 %, a water content is reduced to be more than 2 %, distribution of crystal size is relatively uniform, share of rhombic crystal shapes and columnar shapes are increased, a specific surface area of the crystal is increased and a dehydrated performance of the gypsum is relatively good.

Description

technical field [0001] The invention provides a limestone-gypsum wet desulfurization catalyst, which is used in the desulfurization technology of coal-fired flue gas of large thermal power units, and belongs to the technical field of environmental protection. Background technique [0002] my country's energy consumption structure is dominated by coal, and coal consumption for thermal power generation accounts for more than 50% of the total coal consumption, SO 2 Emissions accounted for SO 2 52% of the total discharge has caused serious environmental pollution problems such as acid rain and soil acidification. Currently thermal power plant SO 2 The control technology is mainly based on flue gas desulfurization. In 2011, the installed capacity of flue gas desulfurization in my country was close to 600 million kilowatts, and a total of 3,266 sets of desulfurization facilities were installed, of which more than 85% used limestone-gypsum wet flue gas desulfurization technology....

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Problems solved by technology

Although the above-mentioned patents can improve the desulfurization efficiency and reduce the amount of limestone, there are problems such as easy foaming of desulfurization slurry, scaling and blockage of equipment, and difficulty in dehydration of gypsum.

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