Synergistic-denitration type liquid boiler clinker removal agent and preparation method and application thereof

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 specifically relates to a synergistic denitration type liquid boiler decoking agent and its preparation method and application, which is used for directly atomizing and spraying into the 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 the boiler design, local high temperatures, improper operation and other problems, the heating surface of the water-cooled wall is prone to coking and dust accumulation in the superheater and reheater pipes. , causing the heat exchange efficiency of the boiler to decrease, the exhaust gas temperature to increase, and coal resources to be wasted seriously. When coking and ash accumulation are severe, falling large coke blocks can easily cause boiler fire-fighting accidents, posing great safety risks. At this time, enterpri...

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