Automatic control SCR flue gas denitrification urea pyrolysis system

Abstract

The invention discloses an automatic control SCR flue gas denitrification urea pyrolysis system. The system is characterized in that a gas-gas heat exchanger is arranged in an inlet flue of an electric precipitator so as to form an air heating unit; a set of flue gas heating tube bundles are arranged in a boiler, so as to form an air reheating unit; after heated by the gas-gas heat exchanger and reheated by the flue gas heating tube bundles, air becomes high-temperature air at the temperature of heat resource required by urea pyrolysis; the high-temperature air is fed into a urea pyrolysis furnace and is mixed with a sprayed atomized urea solution, and then the pyrolysis is performed and an ammonia / air mixture is generated; the ammonia / air mixture is sprayed into an inlet flue of an SCR denitrification reactor through an AIG ammonia injection grating. The automatic control SCR flue gas denitrification urea pyrolysis system has the advantages that the technical structure is simple; the system can be widely applied to an SCR denitrification device of a coal-fired power plant; the urea atomizing pyrolysis efficiency can be effectively increased and the crystal plugging problem can be thoroughly solved; the waste-heat utilization of flue gas can be realized and the electrostatic precipitation efficiency can be increased; water used by a desulfurization system can be reduced.

Description

technical field [0001] The invention relates to an automatic control SCR flue gas denitrification urea pyrolysis system, which belongs to the technical field of energy saving and emission reduction of power plants. Background technique [0002] Selective catalytic reduction SCR denitrification technology is a certain concentration of reducing agent NH 3 It is sprayed into the flue to mix with the flue gas, and reacts under the action of a catalyst in the reactor to form non-toxic and harmless N 2 and H 2 O. Due to its mature technology and high denitrification efficiency, it is recognized as the most effective method for denitrification of coal-fired flue gas. In the current SCR denitrification technology, there are three main reducing agents: liquid ammonia, ammonia water and urea. Liquid ammonia is a hazardous chemical, and its transportation and storage are demanding. There are also potential safety hazards in the transportation and storage of ammonia water, and more...

AI Technical Summary

Problems solved by technology

[0004] In order to avoid the shortcomings of the above-mentioned prior art, the present invention provides an automatic control SCR flue gas denitrification urea pyrolysis process, realizes the utilization of high-temperature flue gas heat at the inlet of the electrostatic precipitator and the reheating zone of the boiler, and effectively solves the problem of urea heat loss. Solve the problems of high energy consumption and high operating costs of the system

Images