A kind of SCR denitrification method and device combined with soot blowing

Abstract

The invention discloses an SCR denitration method and device with a combined soot blowing function. The device comprises an SCR reactor, wherein steam soot blowers and sonic soot blowers are arrangedin sequence in the counter-smoke flow direction above each catalyst bed layer in the reactor; differential pressure transmitters are arranged between the upper and lower portions of the catalyst bed layers; all steam soot blowers are connected in parallel and then externally connected with an high-temperature steam source, each parallel pipeline is provided with a high-temperature steam electric valve respectively, and a main pipe is provided with a temperature sensor; all acoustic sensors are connected in parallel and then externally connected with a compressed air source, each parallel pipeline is provided with a compressed air electric valve respectively, and the main pipe is provided with a pressure transmitter; the device further comprises a controller, the temperature sensor, the pressure transmitter and all differential pressure transmitters are connected with the controller separately, and all high-temperature steam electric valves and compressed air electric valves are connected with the controller separately. The SCR denitration method and device with the combined soot blowing function solves the problems that the content of denitrated particulate matters of the SCR in acement kiln is large, large granular particles in soot cannot be removed, and the thermal energy loss is large due to the steam consumption of a pure steam scoot blower.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide treatment in flue gas from industrial kilns, in particular to a combined soot blowing SCR denitrification method and device, in particular to the selective catalytic reduction denitrification technology applied to the high-dust flue gas at the kiln tail of a cement clinker production line ( Selective Catalytic Reduction, SCR). Background technique [0002] The catalyst is the core of the SCR denitrification technology. In addition to the intrinsic active components, it is very important to ensure the ambient temperature of the catalyst and the specific surface area of ​​the catalyst during operation. Therefore, the purging of the catalyst is an essential part of the SCR denitrification technology. There are two main types of sootblowers for SCR denitrification technology: steam sootblower and sonic sootblower. [0003] The application of SCR denitrification technology in power plants is ma...

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Problems solved by technology

[0006] In view of the large temperature drop of high-dust SCR denitrification compressed air, the simple high-temperature soot blowing technology has large steam consumption and high energy consumption:

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