Electric-bag combined converter gas dry cleaning and recovering system

Abstract

The invention discloses an electric-bag combined converter gas dry cleaning and recovering system. The system is characterized in that a gas hood is connected with an evaporation cooling stack; an evaporative cooling tower is arranged behind the evaporation cooling stack; a single-cell drum-type electrostatic dust collector is arranged behind the evaporative cooling tower; a fan is arranged behind the electrostatic dust collector; a switching station of a bag type waste gas dust collecting device and a bag type gas dust collecting device is arranged behind the fan; the bag type waste gas dust collecting device and the bag type gas dust collecting device are arranged behind the switching station; a gas cooler is arranged behind the bag type gas dust collecting device; and a waste gas burner is arranged behind the bag type waste gas dust collecting device. The system has reasonable structure and good working performances.

Description

technical field [0001] The invention relates to a system for dust removal, purification and recycling of coal gas produced in the converter steelmaking process in the metallurgical industry. Background technique [0002] The oxygen blowing converter is a major smelting process equipment in steel production. my country has more than 400 large and small converters, and its annual output accounts for 70-80% of my country's crude steel output. During the converter blowing process, high-temperature flue gas containing a large amount of dust and combustible gas is produced, in which the CO content can reach more than 80%. After dust removal and purification, it is a kind of converter gas with great recovery value, and the calorific value can reach 8000kJ / N m 3 above. In the "Tenth Five-Year Plan", "Eleventh Five-Year Plan" and "120,000" scientific and technological development plans, the country regards "Converter Gas Purification and Recovery Technology" as a key development ...

AI Technical Summary

Problems solved by technology

[0007] ⑴ The dust removal accuracy is not high, and the fluctuation is large. The designed net gas dust concentration is 20mg / Nm, but many users can actually reach ≤50mg / Nm 3 , affecting the normal operation of downstream process facilities and the recovery and use of clean gas;

[0008] (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;

[0009] (3) The cathode wire is corroded and disconnected, sometimes causing a short circuit, which affects the dust removal efficiency and safe operation;

[0010] ⑷ There are many failure factors and a large maintenance workload, which makes LT operation and safety and stability a pair of contradictions and restricts each other;

[0011] 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

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