Direct-fired heat energy recovering and purifying system and technology of converter gas

Abstract

The invention relates to a direct-fired heat energy recovering and purifying system and technology of converter gas. The adopted technical scheme is that a water-cooled flue gas recovery vessel hood is connected with a primary vaporizing and cooling flue; a CO / O2 analyzer is arranged on the primary vaporizing and cooling flue; the outlet of the primary vaporizing and cooling flue is connected with a burning settling chamber; an ignition device is arranged on the burning settling chamber; the burning settling chamber is connected with a combustion-supporting air supply device; the outlet of the burning settling chamber is connected with a secondary vaporizing and cooling flue; the outlet of the secondary vaporizing and cooling flue is connected with an afterheat boiler; the outlet of the afterheat boiler is connected with a bag-type dust remover; the outlet of the bag-type dust remover is connected with an induced draft fan and a motor; the induced draft fan and the motor adjust the revolution through a transducer; the outlet of the induced draft fan is connected with a chimney. By adopting the direct-fired heat energy recovering and purifying system and technology, heat energy released by CO in the converter gas in a direct burning manner and the heat energy in the flue gas can be recovered, and the flue gas after heat energy recovery is purified; the system is simple in equipment, high in safety performance, and good in dust removal effect.

Description

technical field [0001] The invention relates to a direct combustion heat energy recovery and purification system and process aimed at the recovery and utilization of converter flue gas. Background technique [0002] Converter steelmaking is divided into several stages such as charging, oxygen blowing smelting, deoxidizing steel tapping, slag splashing to protect the furnace, and slag dumping. Each stage produces a large amount of high-temperature flue gas, especially in the flue gas generated in the oxygen blowing smelting stage. Contains a large amount of CO, its concentration can reach 60-80%. Currently, converter gas purification and utilization methods mainly include: OG wet gas purification recovery process, converter gas dry electrostatic precipitator purification recovery process and converter gas dry bag dust removal purification recovery process. In the process of OG wet dust removal, purification and recovery, water is used to wash the gas, which produces a large ...

AI Technical Summary

Problems solved by technology

In the process of OG wet dust removal, purification and recovery, water is used to wash the gas, which produces a large amount of waste water, and the gas contains a large amount of water vapor, which reduces the combustion temperature of the gas. The heat energy of this stage cannot be recovered

Converter gas dry electrostatic precipitator purification and recovery process requires spraying a large amount of water and nitrogen into the atomization cooler, and a large amount of heat energy is absorbed by the water. The saturated water vapor in the converter gas entering the electrostatic precipitator increases, and the volume of the gas increases. The high-voltage electric field on the electrostatic precipitator is easy to generate electric sparks, and when the oxygen and gas are mixed to a certain ratio, it is easy to explode, the safety performance is poor, and the latent heat in the flue gas cannot be recovered

The converter gas heat energy recovery dry bag purification recovery process cannot recover the heat energy in the flue gas in the whole process. The heat energy in the early and late stages of blowing, deoxidation tapping, slag splashing and furnace protection cannot be recovered. The dust collector needs to be based on the gas Design, manufacture and install dust collectors

Images