Heat recovery steam generator flue gas denitration apparatus

Abstract

The invention discloses a heat recovery steam generator flue gas denitration apparatus, which belongs to the industrial tail gas purification equipment field. The apparatus comprises an evaporator provided in the heat recovery steam generator, a multistage heating surface is provided along a flue gas flow channel, the temperature is gradually reduced along the flue gas direction, the apparatus also comprises a denitration reactor, a reducing agent injection system and a preparation system for providing a reducing agent to the reducing agent injection system, a catalyst is provided in the reactor, the denitration reactor is arranged between adjacent two stages heating surfaces of the evaporator, the temperature in two stages heating surfaces is the optimum reaction temperature for catalyst denitration, the reducing agent injection system uniformly injects the reducing agent through the section of the flue gas flow channel, and is arranged on the upstream of the denitration reactor along the flue gas flow direction and possesses several stages heating surfaces to the denitration reactor. According to the invention, the problem of NOx discharge in flue gas of a gas turbine combined cycle unit and an industrial exhaust-heat boiler can be solved, and the SCR denitration requirements with low dust, low NOx concentration and high denitration efficiency can be solved.

Description

technical field [0001] The invention belongs to the field of industrial tail gas purification equipment, and in particular relates to a gas turbine combined cycle unit and a NOx purification equipment in flue gas of an industrial waste heat boiler. Background technique [0002] At present, the mainstream technology of flue gas denitrification devices in thermal power plants is SCR denitrification technology. The reactor arranged between the boiler economizer and the air preheater is used to remove NOx from the flue gas. The reactor is equipped with a denitrification catalyst. The agent is sprayed into the flue through the injection system arranged in the inlet flue and fully mixed with the NOx in the flue gas for catalytic reduction and denitrification. For conventional power plant boilers, the flue gas temperature at the outlet of the economizer is the temperature window required for the SCR denitrification reaction, and it is arranged with high dust, the denitrification ef...

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Problems solved by technology

[0003] The purpose of the present invention is to: solve the problem of NOx emission in gas turbine combined cycle unit and industrial waste heat boiler flue gas, realize environmental protection and energy saving at the same time, solve the SCR denitrification requirements of low dust, low NOx concentration and high denitrification efficiency, and can be flexible and changeable The scheme meets the purpose of denitrification of different types of waste heat boilers

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