SCR denitration method and device with combined soot blowing function

An SCR reactor and denitrification technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of large temperature drop of compressed air, high energy consumption, and large steam consumption, and achieve comprehensive energy consumption reduction, Improve system stability and energy saving, and enhance the effect of soot blowing

Active Publication Date: 2019-04-12
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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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:

Method used

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  • SCR denitration method and device with combined soot blowing function
  • SCR denitration method and device with combined soot blowing function
  • SCR denitration method and device with combined soot blowing function

Examples

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Embodiment 1

[0062] The SCR flue gas denitrification device of the cement kiln is arranged downstream of the C1-level cyclone preheater (that is, the high-dust arrangement), and the flue gas entering the SCR reactor is 10000Nm 3 / h, smoke concentration 60-80g / m 3 , the temperature is 300-340°C, the SCR reactor is arranged vertically, and there are 5 layers of catalysts in total. The upper part of each catalyst layer is equipped with a steam soot blower, the steam is led from the waste heat boiler, the steam temperature is 340°C, the gas source of each sonic soot blower is controlled by an electric valve, and the purge hole of the rake steam soot blower is 400mm away from the upper surface of the catalyst. A sonic sootblower is arranged on the upper part of the rake sootblower. The center line of the bell mouth of the sonic sootblower is 750mm away from the upper surface of the catalyst. The air source of the sonic sootblower is compressed air, controlled by a solenoid valve, and the compre...

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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 method and device, in particular to a selective catalytic reduction denitrification technology for 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 mature, but the promotion and ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56B01D53/96
CPCB01D53/8631B01D53/8696B01D53/90B01D53/96B01D2258/0283
Inventor 韦彦斐周荣高翔彭兴华陈幼荣詹杰
Owner ZHEJIANG UNIV
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