Sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system

A technology for sintering flue gas and pollutants, applied in waste heat treatment, gas treatment, separation methods, etc., can solve the problem of low utilization rate of waste heat resources of sintering flue gas, failure to consider the influence of flue gas humidity, and zero utilization rate of sintering flue gas and other issues, to achieve the effect of reducing flue gas emission control, improving the efficiency of waste heat utilization, and realizing the effect of waste heat utilization
CN104748567AActive Publication Date: 2015-07-01INST OF PROCESS ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2015-07-01

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Abstract

The invention provides a sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system. According to the process, sintering flue gas is divided into low-temperature high-oxygen low-humidity section sintering flue gas, medium-temperature low-oxygen high-humidity section sintering flue gas and high-temperature high-oxygen low-humidity section sintering flue gas according to the emission characteristics of flue gas temperature and oxygen concentration and humidity. The low-temperature high-oxygen low-humidity section sintering flue gas is subjected to dust removal and then is led into a sintering machine for hot air sintering and hot air ignition. The medium-temperature low-oxygen high-humidity section sintering flue gas is subjected to dust removal and desulfurization treatment. The high-temperature high-oxygen low-humidity section sintering flue gas is mixed with cooling machine waste gas and then is led into the sintering machine for hot air sintering. The sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system can conduct staged utilization on flue gas waste heat, recover low-temperature sensible heat in flue gas, enable carbon monoxide left in the sintering flue gas to be secondarily combusted and reduce the energy consumption in the sintering process on the premise that the quality and yield of sintered ores are ensured. Cyclic flue gas utilization is achieved, the pollutant emission quantity of unit sintering ores and total emission quantity of the sintering flue gas are reduced, and the sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system have very high energy-saving emission-reduction value.
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Description

technical field

[0001] The invention belongs to the technical field of sintering production in the metallurgical industry, and relates to a sintering flue gas waste heat classification and recycling process system, in particular to a sintering flue gas waste heat classification and recycling process and pollutant emission reduction process and system, and more specifically to a smoke-based The sintering flue gas waste heat graded recycling and pollutant emission reduction process and system with different temperature, oxygen concentration and humidity emission characteristics. Background technique

[0002] The iron and steel industry is a highly polluting industry, and a large amount of flue gas is generated during the iron ore sintering process, such as a 495m 2 When the sintering machine is in normal production, the amount of flue gas emitted is as high as 1.2 million standard cubic meters (Nm 3 / h), in addition, due to the high air leakage rate (40%-50%) and high solid m...

Claims

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