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Cement kiln flue gas waste heat utilization and purification system and low-temperature SCR denitration system

A flue gas waste heat and purification system technology, applied in the field of low-temperature SCR denitrification system

Pending Publication Date: 2021-04-06
成都达奇科技股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a cement kiln flue gas waste heat utilization and purification system to solve the technical problem of better organically combining the low-temperature SCR denitrification system with the cement kiln flue gas treatment process
The purpose of the present invention is also to provide a low-temperature SCR denitrification system to solve the technical problem of making better use of the temperature of the initial flue gas itself so that the temperature of the flue gas to be denitrated is more in line with the requirements of low-temperature SCR denitrification treatment

Method used

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Embodiment 1

[0038] Adopt the technical solution of the embodiment of the waste heat utilization and purification system of the cement kiln flue gas, wherein the cement kiln 1 is a cement kiln without an SNCR denitrification system in the furnace. During the operation of the system, the state of the dust-removed flue gas output by the dust collector 6 is: the concentration of nitrogen oxides is 300mg / Nm 3 Around, dust concentration 3 , gas volume is about 5000Nm 3 / h, the temperature is 100-150°C. The low-temperature SCR denitrification system controls the volume ratio of ammonia to nitrogen oxides to be 1.05. The denitrification efficiency of the low-temperature SCR denitrification system was measured > 80%, and the outlet NO x Concentration3 , dust concentration 3 .

Embodiment 2

[0040] Adopt the technical solution of the embodiment of the cement kiln flue gas waste heat utilization and purification system, wherein the cement kiln 1 is a cement kiln equipped with an SNCR denitrification system in the furnace. During the operation of the system, the state of the dust-removed flue gas output by the dust collector 6 is: the concentration of nitrogen oxides is 260mg / Nm 3 Around, dust concentration 3 , gas volume is about 5000Nm 3 / h, the temperature is 100-150°C. The volume ratio of ammonia to nitrogen oxides set by the SNCR denitrification system in the furnace is 1.5-1.7:1, and the volume ratio of ammonia to nitrogen oxides set by the low-temperature SCR denitrification system is 0.9-1.05:1 . The denitrification efficiency of the low-temperature SCR denitrification system was measured > 85%, and the outlet NO x Concentration3 , dust concentration 3 .

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Abstract

The invention discloses a cement kiln flue gas waste heat utilization and purification system to solve the technical problem of better organic combination of a low-temperature SCR denitration system and a cement kiln flue gas treatment process. The invention further aims to provide a low-temperature SCR denitration system so as to solve the technical problem that the temperature of the to-be-denitrated flue gas better meets the low-temperature SCR denitration treatment requirement by better utilizing the temperature of the initial flue gas. The cement kiln flue gas waste heat utilization and purification system comprises a preheater, a waste heat boiler, a flow distribution system, a raw material mill, a confluence system, a dust remover and a low-temperature SCR denitration system which are sequentially connected front and back in the flue gas conveying direction of a cement kiln. The low-temperature SCR denitration system comprises: a dividing module which is used for dividing one path of flue gas into at least two paths of flue gas, so that the at least two paths of flue gas are respectively subjected to different treatment to generate a temperature difference; a combining module which is used for respectively receiving at least two paths of flue gas with the generated temperature difference and combining the flue gas to be used as flue gas to be denitrified; and a low-temperature SCR denitration module.

Description

technical field [0001] On the one hand, the invention relates to a cement kiln flue gas waste heat utilization and purification system, and on the other hand, it also relates to a low-temperature SCR denitrification system. Background technique [0002] At present, the combined denitrification technology of low nitrogen burner + staged combustion + SNCR is mostly used in the denitrification of cement kiln flue gas, but the denitrification effect of this combined denitrification technology is limited. In order to further reduce the emission of nitrogen oxides, it can usually be used in the cement kiln flue gas treatment process SCR denitrification system is added to the process. However, the overall effect of the existing SCR denitrification system and its combination with the cement kiln flue gas treatment process is still unsatisfactory. It cannot achieve the effect of ensuring efficient and stable denitrification effect and fully exploiting the value of cement kiln flue ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01D53/34B01D53/76
CPCB01D53/8628B01D53/346B01D53/56B01D53/76B01D2258/0283B01D2258/0233B01D2251/2062
Inventor 李月丽刘晓丽李新尹华强黄昆明李刚张利恒
Owner 成都达奇科技股份有限公司
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