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Desulfurization system and desulfurization method for cement kiln

A technology for cement kilns and kiln tails, which is applied in separation methods, chemical instruments and methods, and dispersed particle filtration, etc. It can solve the problems of inability to meet industrial desulfurization requirements and low desulfurization efficiency, and achieve good economic and environmental benefits and investment costs. The effect of low cost and simple process

Pending Publication Date: 2017-11-21
NANJING KISEN INT ENG
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Problems solved by technology

Adding hydrated lime for desulfurization efficiency is not high, nor can it meet the requirements of industrial desulfurization

Method used

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  • Desulfurization system and desulfurization method for cement kiln

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Embodiment

[0036] Flue gas SO from kiln tail chimney in a cement production enterprise 2 The content is 600~800mg / Nm 3 , with an average concentration of 700mg / Nm 3 . Spray ammonia water with a mass concentration of 20% to 30% into the preheater, the molar ratio of ammonia water to sulfur dioxide generated by the preheater is 2.1 to 2.3, and the ammonia water and the SO2 generated here 2 The reaction produces (NH 4 ) 2 SO 4 ;The generated ammonium sulfate enters the bag filter with the flue gas; the dust of the bag filter is collected into the ash bin, and the desulfurized flue gas enters the chimney; after the desulfurization is completed, the SO in the kiln tail flue gas is detected at the chimney 2 The concentration is 91mg / Nm 3 , the removal rate reaches 87%, and the chimney outlet SO 2The concentration reaches the latest emission standard of the cement industry. The ash bin is rich in (NH 4 ) 2 SO 4 The ash is transported to the middle and upper part of the calciner; the ...

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Abstract

The invention relates to a desulfurization system and a desulfurization method, and specially relates to a cement kiln desulfurization system and cement kiln desulfurization method used for a cement kiln. Ammonia water is sprayed into a preheater, and the sprayed ammonia water reacts with SO2 produced in the preheater to form (NH4)2SO4; the formed (NH4)2SO4 passes through a waste heat power generation boiler along with flue gas and enters a bag-type dust collector; in the bag-type dust collector, dust is collected to a dust bin, and flue gas subjected to desulfurization enters a chimney; dust which is rich in (NH4)2SO4 in the dust bin is conveyed to the middle-upper part of a decomposition furnace; and a stable sulfate is formed in the decomposition furnace by the (NH4)2SO4 formed in a desulfurization process, the formed sulfate enters a rotary kiln, and finally the sulfate is discharged from the rotary furnace along with clinkers. The desulfurization method is less in investment, and high in efficiency, does not produce secondary pollution, and can effectively solve a problem that discharge exceeds the standard that the content of SO2 of flue gas in a chimney of a cement plant is less than or equal to 1000mg / Nm<3>.

Description

technical field [0001] The invention relates to a desulfurization system and a desulfurization method, in particular to a cement kiln desulfurization system and a desulfurization method for a cement kiln. Background technique [0002] The key work opinions on environmental protection promulgated by the State Council, especially pointing out that for cement, petrochemical, coal chemical and other industries SO 2 and NOX governance should be more stringent. GB4915-2013 "Emission Standard of Air Pollutants for the Cement Industry" stipulates that from July 1, 2015, the existing cement kiln and kiln-mill integrated SO 2 The maximum allowable emission concentration is 200mg / Nm3, and new cement kilns and kiln-mill integrated SO 2 The maximum allowable discharge concentration is 200mg / Nm3, and the key areas will implement 1000mg / Nm3 according to the decision of the environmental protection administrative department of the State Council or the provincial people's government 3 str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/48B01D46/02
CPCB01D46/023B01D53/48B01D53/78B01D2251/60
Inventor 桑圣欢陈艳征罗超李安平
Owner NANJING KISEN INT ENG
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