System and method for sintering flue gas SCR denitration catalyst preheating

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.

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,...

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies of the existing technology, in order to solve the impact of excessive moisture and ash in the sintering flue gas on the catalyst during the start-up stage of the sintering machine, solve the problems of easy blockage of the catalyst, hardening of ash on the surface of the catalyst, high energy consumption of flue gas heating and high investment cost of the catalyst. Problem, the present invention proposes a system and method for preheating sintering flue gas SCR denitrification catalysts that can protect the catalyst and ensure the smooth operation of the sintering flue gas purification system

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