Fully dry process purification recovery method for converter gas heat energy and device

Abstract

The invention relates to a fully dry process purification recovery method for converter gas heat energy and a device. The device is characterized by comprising a dust collecting gas collecting hood, an evaporative cooling flue, a primary dust collecting device, a heat energy recovery device, an anti-explosive wear-resistant variable frequency fan, a silencer, a coal gas analyzer and a switching station communicated successively through a pipeline, wherein an ash outlet of the primary dust collecting device corresponds to a first coarse ash conveying system, an ash outlet of the heat energy recovery device corresponds to a second coarse ash conveying system, and ash outlets of the first and second coarse ash conveying systems correspond to an ash storage bin. The method and the device provided by the invention have the advantages that high-temperature sensible heat of the converter gas is utilized deeply; the temperature of flue gas is continuously cooled 600-700 DEG C from 1000 DEG C in a radiation heat transfer section of the evaporative cooling flue, so that the recovered waste heat quantity and the like are increased.

Description

technical field [0001] The invention relates to a converter gas thermal energy full-dry purification recovery device, which belongs to the technical field of metallurgical energy recovery. Background technique [0002] The oxygen blowing converter is a major smelting process equipment in steel production. my country has more than 800 large and small converters, and its annual output accounts for 70-80% of my country's crude steel output. During the converter blowing process, a large amount of dust and combustible high-temperature flue gas is produced, in which the CO content can reach more than 80%. If it is dedusted and purified, it will become a very valuable converter gas with a calorific value of 8000kJ. / Nm 3 above. [0003] Converter gas has the characteristics of high temperature, high dust concentration, high CO concentration, short smelting cycle, large fluctuations in composition, flammable, explosive, and toxic. So far, two purification and recovery technologie...

AI Technical Summary

Problems solved by technology

[0008] ⑴ The dust removal accuracy is not high and the fluctuation is large, which affects the normal operation of downstream process facilities and the recovery and use of clean gas

[0009] (2) There is an explosion problem in the electrostatic precipitator, and the frequent action of the explosion relief valve is an unsafe factor in itself, and it is easy to cause deformation of the polar plate and polar line, reducing the dust removal efficiency

[0010] (3) Corrosion and disconnection of the cathode wire, sometimes causing a short circuit, affecting dust removal efficiency and safe operation

[0011] ⑷ Many failure factors and heavy maintenance and repair workload make LT operation and safety and stability a pair of contradictions, which restrict their promotion and application

[0012] ⑸ LT electrostatic precipitator has a poor purification effect on PM2.5, and it is difficult to solve the problem of fine dust control that has been put on the agenda in recent years

[0013] ⑹ The LT method uses an evaporative cooler to strengthen spray humidification and cooling, and lower the flue gas temperature from 1000-800°C to below 200°C, which requires a lot of water, and the heat of the flue gas is not recovered, which wastes energy

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