System and method for sintering flue gas SCR denitration catalyst preheating

A technology for denitration catalyst and sintering flue gas, which is applied in chemical instruments and methods, separation methods, dispersed particle separation, etc. Controllable, avoid excessive dust, and avoid the effect of catalyst blockage
CN112275137BActive Publication Date: 2022-07-22DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
Publication Date
2022-07-22

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Abstract

The invention discloses a system and a method for preheating a SCR denitration catalyst for sintering flue gas. The system includes: an original sintering flue gas SCR denitration line, including a flue gas introduction unit, a supplementary combustion unit, an SCR unit connected in sequence through a flue A denitration unit and a flue gas discharge unit, and a flue gas heat exchange unit arranged between the inlet flue and the outlet flue of the SCR denitration unit; the cold air intake unit is arranged on the flue gas inlet side of the flue gas heat exchange unit And it is used to introduce cold air; the bypass unit can control the sintering flue gas to be directly sent from the flue gas introduction unit to the flue gas discharge unit. The method utilizes the above-mentioned system for preheating the SCR denitration catalyst for sintering flue gas to preheat the SCR denitration catalyst. The invention can avoid the influence of excessive dust and excessive moisture in the initial stage of the sintering machine to the greatest extent, avoid the blockage of the catalyst caused by high dust and high moisture, and prolong the service life of the catalyst.
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Description

technical field

[0001] The invention relates to the technical field of environmental protection treatment of sintering flue gas, and more particularly, to a system and method for preheating SCR denitration catalyst of sintering flue gas which can effectively protect the catalyst. Background technique

[0002] The iron and steel industry has a large scale, a long process flow, high energy consumption and large pollutant emissions. The Opinions clarified that iron and steel enterprises in various regions should carry out ultra-low emission transformation step by step. Among them, the sintering machine head flue gas requires that the hourly average emission concentrations of particulate matter, sulfur dioxide and nitrogen oxides should not be higher than 10% under the condition of the benchmark oxygen content of 16%. , 35, 50mg / m 3 .

[0003] The sintering process is to mix iron ore powder, pulverized coal (anthracite), lime, blast furnace dust, rolled steel skin, steel slag,...

Claims

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