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

A technology of cement rotary kiln and nitrogen oxides, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, which can solve the problems of temperature window and residence time limitation, and achieve convenient control, lower temperature window, and enhanced denitrification performance Effect

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

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of temperature window and residence time limitation in the implementation of SNCR denitrification technology in cement rotary kiln decomposition furnace, the present invention proposes a SNCR denitrification device and method for controlling nitrogen oxides in cement rotary kiln

Method used

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

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Embodiment 1

[0026] The bagged urea granules are stored in the urea storage room 4, transported by the bucket elevator 5 to the urea dissolving tank 6, and the urea granules are dissolved into a urea solution with a mass fraction of 20% to 60% with deionized water; the additive is Na 2 CO 3 , according to Na 2 CO 3 The molar ratio with urea determines the amount of additive added in a ratio of 1:5; after metering the additive according to the actual required amount with the metering device 13, it is dissolved into 40% Na in the additive storage tank 12 with deionized water 2 CO 3 Solution, after being metered by the second flowmeter 15, be delivered to the urea dissolving tank 6 and the urea solution by the second delivery pump 16 after metering to form a modified urea solution; the modified urea solution is metered by the first flowmeter 7 The first transfer pump 8 is transported to the modified reductant storage tank 9 for storage; or the additive solution is directly mixed with the u...

Embodiment 2

[0029]The bagged urea granules are stored in the urea storage room 4, transported by the bucket elevator 5 to the urea dissolving tank 6, and the urea granules are dissolved into a urea solution with a mass fraction of 20% to 60% with deionized water; the additive is H 2 o 2 , according to H 2 o 2 The molar ratio with urea is in the ratio of 1:5 to determine the additive amount of the additive; after metering the additive according to the actual required amount with the metering device 13, it is diluted with deionized water in the additive storage tank 12 to form a mass fraction of 30% H 2 o 2 Solution, after being metered by the second flow meter 15, be delivered to the urea dissolving tank 6 and the urea solution by the second delivery pump 16 after metering to form a modified urea solution; the modified urea solution is metered by the first flow meter 7 The first delivery pump 8 is transported to the modified reductant storage tank 9 for storage; or the additive solution...

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Abstract

The invention discloses an SNCR (selective non-catalytic reduction) denitration device and an SNCR denitration method for rotary cement kiln nitrogen oxide control and belongs to the technical field of rotary cement kiln pollutant control. The device comprises a reducing agent preparation and storage system, a reducing agent spraying system and a control system, wherein the reducing agent preparation and storage system comprises a urea storage chamber, a bucket elevator, a urea dissolving tank, an additive storage tank, two conveying pumps, a metering device and a modified reducing agent storage tank, the reducing agent spraying system comprises a booster pump and a spray gun, the control system comprises two flow meters and two flow meter controllers, and in addition, a NOx on-line detection instrument is arranged at the outlet part of a decomposing furnace. The method is realized by using the device, Na2CO3 or H2O2 is used as additives, the additives are added into urea solution with the mass fraction being 20 to 60 percent according to a mole ratio of the additives to the urea being 1:3-15, and then, the mixed solution is sprayed into the decomposing furnace in an atomized state. The SNCR denitration device and the SNCR denitration method have the advantages that economy and environment protection are realized, and the denitration performance is high.

Description

technical field [0001] The invention belongs to the technical field of cement rotary kiln pollutant control, in particular to an SNCR denitrification device and method for controlling nitrogen oxides in a cement rotary kiln. Background technique [0002] Nitrogen oxide NO x It is one of the main pollutants of the atmosphere, it is mainly composed of NO and NO 2 Composed of two substances. NO produced by high temperature combustion of various industrial equipment x It mainly exists in the form of NO, which is easily combined with O in the atmosphere after being emitted into the atmosphere. 2 NO 2 , causing acid rain, photochemical smog and other pollution phenomena, causing huge adverse effects on human health, and at the same time causing serious damage to the ecological environment, industrial equipment, and buildings. With the rapid development of my country's social economy, the amount and output of cement in my country have increased significantly. Due to the high-...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/56
Inventor 宋蔷姚强付世龙
Owner TSINGHUA UNIV
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