SNCR (selective non-catalytic reduction) denitration device and method for rotary cement kiln

A cement rotary kiln and denitrification technology, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve problems affecting SNCR denitrification performance, achieve the effects of suppressing negative effects, improving denitrification performance, and simple operation

Active Publication Date: 2012-12-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dust such as CaO in the cement rotary kiln can catalyze the oxidation of the reducing agent, thus affecting the denitrification performance of SNCR

Method used

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  • SNCR (selective non-catalytic reduction) denitration device and method for rotary cement kiln
  • SNCR (selective non-catalytic reduction) denitration device and method for rotary cement kiln
  • SNCR (selective non-catalytic reduction) denitration device and method for rotary cement kiln

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The reducing agent used is urea, and the ammonia to nitrogen ratio is 1.0. The first-level spray gun 3 is installed at the position of the tail 2 of the cement rotary kiln at a temperature of 1100℃; x Online detection instrument 13 detects NO in flue gas x The concentration is 1000 mg / Nm 3 , After spraying urea, NO x Online detection instrument 13 detects NO in flue gas x The concentration becomes 210mg / Nm 3 , The actual denitrification efficiency after the first-level spray gun 3 is sprayed with urea is 79%; the second-level spray gun 5 is placed at the bottom of the decomposition furnace 4 at a temperature of about 1000 ℃, and the NO x Online detection instrument 13 detects NO in flue gas x The concentration is 650mg / Nm 3 , After spraying urea, NO x Online detection instrument 13 detects NO in flue gas x The concentration becomes 200 mg / Nm 3 , The actual denitrification efficiency after urea treatment by the secondary spray gun 5 is 69.2%, and the ammonia leakage detected...

Embodiment 2

[0031] The reducing agent used is ammonia, and the ratio of ammonia to nitrogen is 1.0. The first-stage spray gun 3 is installed at the position of the tail 2 of the cement rotary kiln, and the temperature is 1050℃. The NO x Online detection instrument 13 detects NO in flue gas x The concentration is 1210 mg / Nm 3 , After spraying ammonia water after NO x Online detection instrument 13 detects NO in flue gas x The concentration becomes 320mg / Nm 3 , The actual denitrification efficiency after the first-stage spray gun 3 is sprayed with ammonia is 74%; the second-stage spray gun 5 is placed at the bottom of the decomposition furnace 4 at a temperature of 900~950℃, and the NO x Online detection instrument 13 detects NO in flue gas x The concentration is 750mg / Nm 3 , After spraying ammonia water after NO x Online detection instrument 13 detects NO in flue gas x The concentration becomes 265 mg / Nm 3 , The actual denitration efficiency after spraying urea by the secondary spray gun 5 is ...

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Abstract

The invention discloses an SNCR (selective non-catalytic reduction) denitration device and an SNCR denitration method for a rotary cement kiln and belongs to the technical field of rotary cement kiln pollutant discharge control. The device comprises a reducing agent preparation and storage system, a reducing agent transporting system, a reducing agent spraying system and a control system, wherein the reducing agent preparation and storage system consists of a reducing storage tank and a reducing agent dissolving tank, the reducing agent transporting system consists of a conveying pump and a conveying pipeline, the reducing agent spraying system consists of a booster pump and two stages of spray guns, and the control system consists of two flow meters and two flow meter controllers; and the device further comprises NOx on-line detection instruments respectively positioned in a position with the distance being 10 to 20m from the downstream parts of the two-stage spray guns. The method is realized by using the device, ammonia, urea or alkaline industrial waste liquid is used as a reducing agent, the proportion of the quantity of nitric oxide substances in smoke of a decomposing furnace and the quantity of nitrogen element substances in the reducing agent is determined according to the condition of NOx purified by each stage of spray gun, and the reducing agent is sprayed into the decomposing furnace. The SNCR denitration device and the SNCR denitration method have the advantages that economy and environment protection are realized, the operation is simple, the control is flexible, and the denitration performance is high.

Description

Technical field [0001] The invention belongs to the technical field of pollutant emission control in cement rotary kilns, and particularly relates to an SNCR denitrification device and method for cement rotary kilns. Background technique [0002] Nitrogen oxide NO x Is one of the main pollutants in the atmosphere, it is mainly composed of NO and NO 2 It consists of two substances. NO produced by high temperature combustion of various industrial equipment x It mainly exists in the form of NO. After NO is discharged into the atmosphere, it can easily interact with O in the atmosphere. 2 Reaction to form NO 2 , Causing pollution phenomena such as acid rain and photochemical smog, which have a huge negative impact on human health, and also cause serious damage to the ecological environment, industrial equipment, and buildings. With the rapid development of my country's social economy, the consumption and output of cement in my country have risen sharply. Due to the high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/56
Inventor 宋蔷姚强付世龙
Owner TSINGHUA UNIV
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