Fuel gas injection type recovery method of sensible heat of convertor coal gas and convertor flue gas

Abstract

The invention relates to a fuel gas injection type recovery method of sensible heat of convertor coal gas and convertor flue gas, and belongs to the technical field of recycling sensible heat of convertor coal gas and convertor flue gas. The main technical problems to be solved are as follows: on one hand, the water waste problem is to be solved, on the other hand, efficient utilization of physical sensible heat in the convertor flue gas is to be realized, and the effects of eliminating the potential safety hazard existing in the traditional system, greatly improving the yield of convertor coal gas and the like are also to be achieved. The method comprises allocation of a flue heat exchange device, a rough dust removing device and a refined dust removing device, an induced draft fan, a pipe network a control system, and is characterized in that a combustion chamber is arranged in a recovery system, fuel gas is injected into the combustion chamber, a heat exchanger is also arranged in the recovery system and the heat exchanger is installed behind the combustion chamber. The method is suitable for the technical field of recycling physical sensible heat in the convertor coal gas and convertor flue gas, and has the effects of saving energy, saving water, being safe, improving yield of convertor coal gas and the like.

Description

technical field [0001] The invention relates to a method for recovering the sensible heat of injected gas type converter gas and converter flue gas, and belongs to the technical field of recovering and utilizing the sensible heat of converter gas and converter flue gas. Background technique [0002] The converter gas recovery system is one of the process links widely used in the current metallurgical industry. Its main process equipment includes flue heat exchange device, cooling device, dust removal device, induced draft fan, switching station, pipe network and control system. The cooling device used in the existing system is a vaporization cooling tower, and the dust removal device used is an electrostatic precipitator and the like. [0003] The main problems with the existing system are: [0004] 1. The physical sensible heat in the converter flue gas is completely wasted in the process of vaporization and cooling. Since the flue gas volume of the converter is large, th...

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Problems solved by technology

[0004] 1. The physical sensible heat in the converter flue gas is all wasted in the process of vaporization and cooling. Due to the large amount of flue gas in the converter, this waste is amazing

[0005] 2. In the evaporative cooling tower, the cooling rate of the pre-cooled converter flue gas from the flue heat exchange device is very fast, which has the condition that the reaction between oxygen and gas is not sufficient, and there is a chance of coexistence of remaining oxygen and remaining gas , become an important safety hazard; when the amount of oxygen and gas are in a transitional state where they can be basically exhausted through combustion, their concentrations are relatively low at this time, and the cooling rate in the vaporization cooling tower is very fast Faster, it is easier to exist the coexistence state of residual oxygen and residual gas, so that the existence of safety isolation section with low concentration of oxygen and combustible gas between the gas flow section with excess oxygen and excess gas is not obvious, which also constitutes an important safety hazard

At the same time, when the above-mentioned gas flow section enters the switching station, it will cause the gas concentration to be still high, such as about 35%, because the oxygen content exceeds the standard, such as ≥ 2%, and it will be released, thereby causing the gas. waste

[0006] 3. Due to the dangerous concentration of oxygen entering the fine dust collector and the subsequent system is unavoidable, there are potential safety hazards in the system

[0007] 4. Evaporation cooling not only wastes a lot of sensible heat of the converter flue gas, but also consumes a lot of water, and the quality of the converter gas is also reduced due to the entry of water, which improves the anti-corrosion requirements of the system

[0008] 5. Because the moisture entering the system has a tendency to condense, the bag filter cannot be used in the existing system; the use of the electrostatic precipitator not only requires a large initial investment, but also high operating costs (including maintenance costs and energy consumption, etc.)

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