Converter pure dry dedusting system integrating high-temperature constant-temperature treatment, high-temperature purification and waste heat recovery

Abstract

The invention belongs to the field of energy conservation and environmental protection, and particularly relates to a converter pure dry dedusting system integrating high-temperature constant-temperature treatment, high-temperature purification and waste heat recovery. The system comprises an evaporative cooling flue, a high-temperature phase change type heat storage device, a high-temperature-resistant pulse-jet ceramic filter tube type dust removal device, a waste heat recovery system and an explosion venting escape flue gas trapping and treatment system. Converter gas does not directly contact with water in the cooling process, and does not contain water. CO loss is reduced, and gas recovery amount is large. The converter gas is beneficial to conveying and use, and has high gas quality.A full waste heat recovery device is used for recovering converter flue gas waste heat to the maximum extent, steam is stably produced for power generation or production, and the energy-saving benefit is obvious. Besides heat and gas recovery, all kinds of dust are free of water mixing, easy to separate, recover and reuse, free of secondary pollution and free of waste water treatment cost.

Description

technical field [0001] The invention belongs to the field of energy saving and environmental protection, and specifically relates to a converter pure dry dust removal system integrating high temperature constant temperature, high temperature purification and waste heat recovery. Background technique [0002] In recent years, smog weather has frequently appeared in our country, and the air quality problem has attracted great attention from the whole society. As a major player in industrial emissions, the iron and steel industry is increasingly subject to strict restrictions on its emission standards and emissions. [0003] China's iron and steel industry is in a period of structural adjustment, optimization and upgrading, and is facing increasingly severe resource and environmental pressures. It must take the road of resource-saving and environment-friendly sustainable development. [0004] As the main steelmaking process of iron and steel enterprises, converter steelmaking ...

AI Technical Summary

Problems solved by technology

[0007] There is always a high risk of gas explosion in dry dust removal, and the electrostatic precipitator cannot avoid the high-voltage flashover problem of the electric field, which leads to the explosion venting problem of the electrostatic precipitator

During the actual production and operation of the converter primary flue gas dry electrostatic precipitator system, due to the frequent occurrence of explosion and smoke problems, the converter primary flue gas dry precipitator system often cannot ensure that the flue gas emission is stable and up to standard

At the same time, the explosion venting of the electrostatic precipitator also causes secondary pollution in the workplace

[0008] Because the temperature of the flue gas is cooled by spraying water and steam, the flue gas contains a lot of water, which causes corrosion of the flue gas pipe, electrostatic precipitator plate and shell, gas pipe, and gas recovery equipment

[0009] Oxygen-blowing smelting is not continuous in the steelmaking process of the converter, so the vaporization cooling flue and waste heat recovery device of the primary dedusting system of the converter are always in the working state of heating and cooling cycles alternately, resulting in the alternation of the vaporization cooling flue and waste heat recovery device high thermal stress

Under the action of alternating thermal stress, the vaporization cooling flue and waste heat recovery device have a short service life, and the daily maintenance and repair workload is heavy, which also has a great impact on the converter steelmaking production to a certain extent

[0010] The explosion venting devices installed in the primary dust removal system of the existing converter are all directly connected to the atmosphere, and when the explosion venting occurs in the system, it will also cause a certain degree of secondary pollution to the working environment

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