Comprehensive treatment device for tail gas of heating furnace

Abstract

The invention provides a comprehensive treatment device for tail gas of a heating furnace. The device comprises a mixing flue, a low-temperature SCR reactor, a desulfurization flue and a bag-type dust collector which are sequentially arranged in the flue gas conveying direction. The input end of the mixing flue is provided with two flue branches, and the junction of the two flue branches is connected with a dilution fan. A homogenizing device and an ammonia gas spraying pipe are arranged in the mixing flue, the dilution fan is connected with the homogenizing device through a blowpipe, and the ammonia gas injection pipe is arranged on the upstream of the homogenizing device and connected with a reducing agent spraying system. The mixing flue is further connected with a tail gas heating device. The output end of the mixing flue is connected into an inlet of the low-temperature SCR reactor, an outlet of the low-temperature SCR reactor is connected with the bag-type dust collector through the desulfurization flue, and the desulfurization flue is connected with a desulfurizing agent spraying and flow equalizing device which is used for spraying a desulfurizing agent into the desulfurization flue. The device is compact in overall structure, uniform mixing can be ensured, and the desulfurization efficiency is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of environmental protection equipment, in particular to a comprehensive treatment device for exhaust gas of a heating furnace. 【Background technique】 [0002] The heating furnace is an important component of the iron and steel plant. The tail gas produced during the production process includes soot and air smoke. The flue gas contains SO 2 , NO X , dust and other harmful pollutants. With the strengthening of environmental protection, it is proposed that the tail gas treatment of the heating furnace should meet the ultra-low emission requirements, that is, the emission concentration of particulate matter should be less than or equal to 10mg / m under the condition of 8% of the reference oxygen. 3 , SO 2 Emission concentration is less than or equal to 50mg / m 3 , NO x Emission concentration is less than or equal to 150mg / m 3 , therefore, it is very important to carry out deep purification treatment of the...

AI Technical Summary

Problems solved by technology

[0003] There are certain defects in the existing technology: the exhaust gas of the heating furnace is divided into soot flue gas and air flue gas. The current technology is to treat the two flue gases separately. The project has many equipments, complex control, serious secondary pollution, and occupies an area The area is large, which increases the construction cost of the project

In addition, the denitrification reducing agent injection device has a large resistance and a complex structure

The desulfurization agent is sprayed into and mixes unevenly with the flue gas, which affects the desulfurization efficiency. A comprehensive treatment device for heating furnace tail gas is now proposed

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