A synergistic denitration type liquid boiler decoking agent and its preparation method and application

Abstract

The invention discloses a synergistic-denitration type liquid boiler clinker removal agent and a preparation method and application thereof and belongs to the field of clean combustion of coal.The clinker removal agent is prepared from, by weight, 5-20% of magnesium acetate, 1-5% of copper nitrate, 1-5% of nickel nitrate, 2-10% of ammonium nitrate, 3-10% of boric acid, 0.5-2% of cerium nitrate and the balance water.The clinker removal agent is atomized and added into a boiler through jetting, magnesium acetate is decomposed to generate MgO and alkyl (CHi) at the high temperature, the fuel intermediate CHi has reduction action for NO, the content of NO in flue gas can be reduced, the synertistic effect is achieved for denitration, generated nanoscale MgO pores are high in specific surface area, the clinker removal agent can serve as a catalytic carrier of a denitration reaction and also can react with a low-melting-point compound in a clinker layer to raise the clinker melting point so that clinker can be loosened and be crispy, the clinker removal agent is small in consumption and can obviously reduce the boiler coking phenomenon, and meanwhile the good synergistic NO removal effect is achieved.

Description

technical field [0001] The invention belongs to the field of coal clean combustion, and in particular relates to a synergistic denitrification type liquid boiler decoking agent and its preparation method and application, which are used for direct atomization and spraying in a furnace to suppress and remove coking in the furnace. Background technique [0002] During the long-term operation of coal-fired boilers, due to large changes in coal quality, defects in boiler design, local high temperature, and improper operation, etc., the heating surface of the water-cooled wall is prone to coking, superheater, and reheater pipes. , so that the heat transfer efficiency of the boiler decreases, the exhaust gas temperature increases, and the waste of coal resources is serious. When the coking and ash accumulation is serious, the falling of large coke blocks can easily cause a boiler fire extinguishing accident, which poses a great safety hazard. At this time, the enterprise usually ne...

AI Technical Summary

Problems solved by technology

Comprehensive analysis of the existing liquid decoking agents, most of which use nitrate as the basic active ingredient, use its "micro-explosion" effect and combustion-supporting properties to promote the loosening and falling off of coke slag, and its decomposition at high temperature will produce a large amount of NO x , but the NO produced by the decomposition of a large amount of nitrate x The pollutants will increase the emission of pollutants. Although the boiler achieves the purpose of decoking, the NO x The increase in emissions will inevitably increase the difficulty of denitrification and the cost of out-of-stock, such as the Chinese patent document "Publication No. CN103215100A", which discloses a decoking agent for boilers of 600MW and above thermal power generation units, which is characterized by the composition of the following components in weight ratio : Sulfur powder: Potassium nitrate: Sodium borate: Charcoal powder: Nano-ceramic powder = 16:60~80:50~70:15~20:5~8. and system pollution, in this case decoking is actually not cost-effective

Images