Thermal power plant SCR denitration reaction catalytic device

Abstract

The invention belongs to the technical field of flue gas denitration and specifically relates to a thermal power plant SCR denitration reaction catalytic device which comprises a flue gas injection pipe, an ammonia gas injection pipe, a mixing tank, an ammonia spraying device and a reactor, wherein the ammonia spraying device comprises a motor, a nut, a rotating ring, an elastic spiral pipe and aninstallation block; the motor is arranged at the top of the mixing tank, the nut is arranged on a rotating shaft of the motor in a rotary mode, the rotating ring is arranged on an outer ring of the nut in a rotary mode, one end of the elastic spiral pipe is fixedly connected to the rotating ring, the other end of the elastic spiral pipe is arranged on the installation block in a rotary mode, theinstallation block is fixedly connected to an inner wall of the mixing tank, and the ammonia injection pipe is arranged on the outer side of one side of the installation block of the mixing tank; theammonia injection pipe and the elastic spiral pipe are communicated, and a group of air spraying holes are arranged on the elastic spiral pipe. According to the thermal power plant SCR denitration reaction catalytic device disclosed by the invention, the motor can drive the rotating ring to move up and down, the elastic spiral pipe can be changed into a conical shape from a planar shape under thetraction of the rotating ring; by means of changing ammonia spraying position, the ammonia gas and the flue gas can be fully mixed.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, in particular to a catalytic device for SCR denitrification reaction in a thermal power plant. Background technique [0002] NOx is a major pollutant in air pollution. It can form photochemical smog, acid rain, destroy the ozone layer, and even cause a serious greenhouse effect, which is extremely harmful to the human body, the environment and the ecosystem. Therefore, controlling NOx and perfecting denitrification technology are of great significance to the protection of the ecological environment and the sustainable development of our country. [0003] At present, the traditional denitrification mainly adopts selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). Among them, the widely used SCR technology is an effective method to control NOx emissions from the tail gas. The reducing agents include urea, ammonia water and pure ammonia. Usually, NH3 i...

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Problems solved by technology

[0005] This technical solution can fully mix ammonia gas and flue gas, but this solution sprays ammonia gas through the swirl atomizing nozzle, which makes the concentration of ammonia gas at the top higher, resulting in insufficient mixing of ammonia gas and flue gas, which affects the follow-up reduction reaction of , making the scheme less efficient

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