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SCR denitration device and method applied to high-dust-content smoke from kiln tail of cement clinker production line

A cement clinker and production line technology, applied in the direction of separation methods, chemical instruments and methods, climate sustainability, etc., can solve the problems of reduced catalyst activity, high power consumption, and difficult transformation, so as to achieve no impact on thermal insulation design and overcome The effect of pressure loss

Active Publication Date: 2015-05-27
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Setting up a high-temperature dust collector can effectively solve the abrasive, clogged and deactivated catalyst caused by high dust in theory, but in actual engineering, there are problems such as difficult transformation, large pressure loss, and high power consumption.
In addition, the flue gas temperature at the inlet of the SCR reactor in the cement kiln decomposition furnace is about 320-350°C, and the temperature drop caused by the installation of high-temperature pre-dust removal will also reduce the activity of the catalyst

Method used

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  • SCR denitration device and method applied to high-dust-content smoke from kiln tail of cement clinker production line
  • SCR denitration device and method applied to high-dust-content smoke from kiln tail of cement clinker production line

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Embodiment 1

[0063] This embodiment follows as figure 1 The device and process shown. Cement kiln calciner 10000Nm 3 / h Bypass flue gas SCR denitrification test device, set up bypass at the front and back ends of the waste heat boiler to introduce actual flue gas, flue gas temperature 350℃±20℃, dust content 30-100g / m 3 , The initial concentration of NOx is 280-1200mg / m3 (the upstream of the SCR denitrification reactor has been equipped with SNCR denitrification device, if the upstream SNCR denitrification device is not put into operation, the initial concentration is as high as 700-1200mg / m 3 , After the upstream SNCR denitrification device is put into operation, the minimum NOx emission concentration can be controlled at 200mg / m 3 , Generally controlled at 320mg / m according to the standard 3 Below, therefore, the inlet NOx concentration can be adjusted within a wide range.

[0064] See attached for details figure 1 SCR denitration reactor is installed on the bypass flue at the front and back e...

Embodiment 2

[0069] This embodiment follows as figure 2 The device and process shown. SCR denitration project of cement kiln calciner with daily output of 2500t clinker, deep denitration of flue gas, flue gas volume of 295000m 3 / h, flue gas temperature 350℃±20℃, dust content 30-100g / m 3 , The initial concentration of NOx is 280-1200mg / m 3 (The upstream of the SCR denitrification reactor has already been equipped with an SNCR denitrification device. If the upstream SNCR denitrification device is not put into operation, the initial concentration is as high as 700-1200mg / m 3 , After the upstream SNCR denitrification device is put into operation, the minimum NOx emission concentration can be controlled at 200mg / m 3 , Generally controlled at 320mg / m according to the standard 3 Below, therefore, the inlet NOx concentration can be adjusted within a wide range.

[0070] See attached for details figure 2 An SCR denitration reactor is added at the front end of the waste heat boiler. After denitratio...

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Abstract

The invention discloses an SCR (selective catalytic reduction) denitration device and an SCR denitration method applied to high-dust-content smoke from a kiln tail of a cement clinker production line. The device comprises a cement kiln decomposing furnace, a preheater, an afterheat boiler, a raw mill, an electric dust remover and a kiln tail chimney which are connected in sequence along the smoke direction, and further comprises an SCR reactor, wherein the SCR reactor comprises a reactor shell; an inlet divergent section is arranged at the top of the reactor shell, and an ash bucket is arranged at the bottom of the reactor shell; an inlet flue of the SCR reactor is connected with the preheater and the inlet divergent section and is provided with a reducer sprayer; a plurality of catalyst layers are arranged in the reactor shell in sequence from top to bottom; a plurality of steam ash blowers correspond to the catalyst layers one to one and are arranged above the corresponding catalyst layers; an outlet flue of the SCR reactor is connected with the bottom of the reactor shell and an upstream flue or a downstream flue of the afterheat boiler and is additionally provided with a high-temperature fan. On the basis that a high-temperature dust remover is not arranged, the SCR denitration device can handle with the smoke characteristics of high NOx load fluctuation, temperature fluctuation and high dust content.

Description

Technical field [0001] The invention belongs to the technical field of treatment of nitrogen oxides in flue gas of industrial furnaces and kilns, and specifically relates to an SCR denitrification device and method for high-dust flue gas of kilns in cement clinker production lines. Background technique [0002] There are three main types of NOx control technologies for cement kiln decomposers: Low NOx burner (LNB), Selective Non-Catalytic Reduction (SNCR) and SCR (Selective Catalytic Reduction, SCR) Denitration technology. [0003] Low-nitrogen combustion technology includes low-NOx burners, fuel staged combustion, air staged combustion and other means. It mainly starts from the aspects of controlling oxygen supply or reducing flue gas temperature to reduce the generation of thermal NOx. Its denitrification effect is affected by the cement clinker calcination process. Restrictions, the denitration efficiency is generally considered to be 15-30%, and the stability is not good. It i...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56F27D17/00
CPCY02C20/10Y02P10/25
Inventor 周荣韦彦斐许明海王付超汪昊琪周敏捷姚建松顾震宇褚定衫
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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