Method for desulphurizing, denitrating and decoking fire coal

Abstract

The invention discloses a method for desulphurizing, denitrating and decoking fire coal. In the method, in a raw coal burning stage, a synergist is added in an amount of 0.2 to 0.3 weight percent based on the total weight of the raw coal into the fire coal, and a catalytic active agent is added in an amount of 0.002 to 0.008 weight percent based on the total weight of the raw coal into a slurry boax in a desulphurizing system at the same time. The synergist comprises 8 to 25 mass percent of calcium carbona, 5 to 15 mass percent of magnesium oxide, 5 to 10 mass percent of silicon dioxide, 5 to10 mass percent of zinc oxide, 8 to 10 mass percent of manganese dioxide, 15 to 40 mass percent of calcium oxide, 5 to 10 mass percent of barium hydroxide, 3 to 8 mass percent of aluminum oxide and 8to 15 mass percent of potassium permanganate; and the catalytic active agent comprises 0 to 40 mass percent of active calcium oxide, 20 to 30 mass percent of active carbon, 10 to 15 mass percent of calcium ammonium nitrate, 5 to 20 mass percent of ferric oxide and 2 to 10 percent of zinc oxide. Under the condition of not changing the conventional boiler equipment and process, the method can realize fire coal combustion-supporting and coal-saving functions at one time so as to perform desulphurization, denitration and decoking.

Description

technical field [0001] The invention relates to the field of desulfurization and denitrification, in particular to a method with integrated functions of desulfurization, denitrification and coke cleaning in the coal burning process. Background technique [0002] At present, there is no combustion-supporting coal-saving, SO 2 , NO x , emission reduction, dust removal and coke removal and other methods, the single-function desulfurization technology has the following types: [0003] 1. Desulfurization before combustion: desulfurize the raw coal by concentrated water washing, molding and other methods. The main problem is that the structural sulfur or organic sulfur in coal cannot be removed: and the cost is high, especially the coal used in power plants cannot be used. [0004] 2. Flue gas desulfurization: mainly using flue gas desulfurization devices. Existing problems are huge cost, high operating cost, and secondary pollution. [0005] Wet limestone gypsum process and ...

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Problems solved by technology

[0006] 3. The single sulfur fixation and desulfurization technology in combustion fails to solve the problem of sulfur fixation and secondary release in the high temperature area above 900 °C, the desulfurization rate is low, and the desulfurization effect is not good

Although the synergist can also realize the functions of coal saving, desulfurization and coke cleaning at the same time, its effect is not significant

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