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Sintering flue gas purification method based on catalytic action of hot sinter

A technology of sintering flue gas and sintering ore, which is applied in the field of flue gas purification, can solve the problems of lower flue gas temperature, high operating cost, and large floor space, and achieve high waste heat utilization rate, good purification effect, and small floor space Effect

Inactive Publication Date: 2015-08-05
武汉钢铁有限公司 +2
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Problems solved by technology

However, since this process first performs wet desulfurization, the temperature of the flue gas will be greatly reduced, and the denitration treatment can only be carried out after the temperature is raised to about 350°C by the heating device.
This process has problems such as large energy consumption, high operating costs and large floor space.

Method used

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  • Sintering flue gas purification method based on catalytic action of hot sinter
  • Sintering flue gas purification method based on catalytic action of hot sinter
  • Sintering flue gas purification method based on catalytic action of hot sinter

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Embodiment Construction

[0032] The rationale for the reaction in the SCR denitrification stage is as follows:

[0033]

[0034]

[0035]

[0036]

[0037]

[0038] When the reaction temperature is 350-600°C, the NO in the flue gas x with NH 3 Under the action of hot sinter, the selective catalytic reduction reaction is carried out, and the NO in the flue gas x converted to N 2 (such as reaction equations (1)-(3)), so as to achieve SCR denitrification, due to the O in the sintering flue gas 2 The concentration is as high as 14-18%, therefore, at high temperature (≥600°C), the unreacted NO part will be further oxidized to generate NO 2 ((such as reaction equations (4)-(5)).

[0039] The ammonia desulfurization and denitrification process can simultaneously remove the unremoved nitrate in the flue gas while desulfurizing, and its reaction principle is as follows:

[0040] The denitrated sintering flue gas is introduced into the desulfurization and denitrification tower, and ammonia w...

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PUM

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Abstract

The invention discloses a sintering flue gas purifying method and a system thereof based on thermal agglomerate catalytic reducing. The problem that existing sintering flue gas purifying is complex in technology and high in energy loss, and equipment investment and operation cost is high is solved. According to the technical scheme, sintering flue gas after dust removing guided out from a sintering machine and agglomerate guided out from the sintering machine are subjected to direct heat exchanging in agglomerate cooling equipment, selective catalytic reducing reaction is carried out under the effect of the agglomerate, NOx in the flue gas is converted to N2, the volume ratio of NH3 / NOx in the flue gas is controlled to be equal to 0.4-0.5, the temperature of denitration flue gas guided out from the agglomerate cooling equipment is lowered to 100-150 DEG C through waste heat recovery, then clean flue gas is obtained through ammonia process desulfurization and denitration, the clean glue gas is discharged through a chimney, temperature of the agglomerate is lowered below 150 DEG C in the agglomerate cooling equipment in a heat-exchanging mode, and then the agglomerate is sent to the next procedure. The method is simple in technology and low in energy loss, SCR catalysts are not consumed, desulfurization and denitration effect is good, the system is small in occupied space, investment cost and operation cost are low, and environment-friendly performance is achieved.

Description

technical field [0001] The invention relates to a flue gas purification method, in particular to a sintering flue gas purification method based on the catalysis of hot sintered ore. Background technique [0002] With the rapid development of my country's economy and the remarkable improvement of the level of industrialization, the air pollution is becoming more and more serious. In 2010, my country's sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ) emissions were 22.678 million tons and 22.766 million tons respectively, both ranking first in the world. 2 and NO x The emissions were 1,766,500 tons and 931,000 tons respectively, ranking among the top among all industrial emission sources, of which more than 70% of SO 2 , more than 50% NO x From kiln sintering machine. In 2012, the Ministry of Environmental Protection promulgated the "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standard (GB28662-2012)", which puts forward new requirements for the emi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/56B01D53/50
CPCY02C20/10
Inventor 吴高明杨秀林肖扬陈旺生秦林波韩军罗静
Owner 武汉钢铁有限公司
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