Coal-fired boiler flue gas desulphurization and denitrification device

Abstract

The invention relates to a coal-fired boiler flue gas desulphurization and denitrification device, comprising a coal-fired boiler, an on-line flue gas monitoring and control device, a bag-type dust collector, a fan, an adsorptive reactor, a water bath type ammonia gasifier and a wet electro-static precipitator; the device is characterized in that the coal-fired boiler is connected with the on-line flue gas monitoring and control device, the bag-type dust collector, the fan, the adsorptive reactor, the water bath type ammonia gasifier and the wet electro-static precipitator by pipelines; the on-line flue gas monitoring and control device is connected with a frequency-variable rotary feeder; an electronic screw scale is connected with the upper part of the frequency-variable rotary feeder and is also connected with an unloader. The coal-fired boiler flue gas desulphurization and denitrification device can be used for removing pollutants such as SO2, NOx, mercury, dioxin and smoke in coal-fired boiler flue gas; the fine particulate matters and aerosol in the flue gas are removed by means of the wet electro-static precipitator, and the removal rates of the fine particulate matters and the aerosol reach up to 99-99.99%, so that the combined pollutants such as the fine particulate matters and SO3 acid mist can be efficiently removed; therefore, up-to-standard emission of the flue gas is realized, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to flue gas desulfurization and denitrification equipment, in particular to a coal-fired boiler flue gas desulfurization and denitrification device, which belongs to the technical field of environmental protection. Background technique [0002] At present, for the treatment of flue gas from coal-fired boilers, the denitrification process mainly uses ammonia water as a reducing agent to react with nitrogen oxides in the flue gas; then remove SO 2 gas, where SO 2 The gas removal method adopts a semi-dry process, and the above method has many disadvantages: [0003] (1) The denitrification process mainly uses ammonia water as a reducing agent to react with nitrogen oxides in flue gas; its disadvantage is that ammonia water and liquid ammonia are dangerous goods and are not convenient for transportation and storage. [0004] (2) The semi-dry desulfurization method is to spray lime slurry into the reactor through nozzles or rotary sp...

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Problems solved by technology

[0003] (1) The denitrification process mainly uses ammonia water as a reducing agent to react with nitrogen oxides in the flue gas; its disadvantage is that ammonia water and liquid ammonia are dangerous goods and are not convenient for transportation and storage

[0004] (2) The semi-dry desulfurization method is to spray lime slurry into the reactor through nozzles or rotary sprayers to form droplets with smaller particle sizes, so that SO 2 Gas reacts with lime slurry to form salts. The disadvantage is that the preparation of lime slurry is complicated and the desulfurization efficiency is limited.

[0005] The traditional flue gas dedusting, desulfurization and denitrification device has a good effect on the dust and SO in the flue gas 2 , NOx has a certain removal effect, but for fine dust, SO 3 The removal efficiency of complex pollutants such as acid mist is very low;

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