All-dry method converter gas purification recovery technology

Abstract

The invention relates to an all-dry method converter gas purification recovery technology. By means of the cold and clean gas dilution effect, converter gas with the temperature of 900-1000 DEG C and cold and clean converter gas from a gasometer are rapidly mixed and cooled to reach the temperature of 600 DEG C, and mixed gas with the temperature of 600 DEG C is formed; then, a heat pipe exchanger is utilized for recycling intermediate and low temperature exhaust heat in the converter gas, the mixed gas is cooled to reach the temperature of 200-250 DEG C, and dust removal is performed to obtain clean gas. The converter gas waste heat can be recycled to the largest extent, the steel melting cost is lowered, no water resources are consumed, and the sewage disposal cost is saved; the accidents that a steam cooler accumulates dust seriously, the service life of a spraying gun of the steam cooler is short, wet dust is likely to be accumulated on an electrostatic dust collector and polar lines are bound are fundamentally eradicated; nitrogen atomization cooling water is not needed, the nitrogen content in the converter gas is lowered, and the CO content is improved.

Description

technical field [0001] The invention relates to a process for purifying and recovering converter gas, in particular to a fully dry process for rapidly cooling converter gas from 900°C to 1000°C to 600°C by diluting cooled gas, and then using a heat pipe heat exchanger to recover medium and low-temperature waste heat from converter gas. French converter gas purification and recovery process. Background technique [0002] Converter gas purification and recovery technology is the basic technology to reduce the production cost of steelmaking process and realize negative energy steelmaking. At present, converter gas purification and recovery technologies include wet purification and recovery (OG method) and semi-dry purification and recovery, both of which have certain defects. [0003] (1) Defects in the wet purification and recovery (OG method) process: the heat released by the cooling of converter gas above 900°C is absorbed by water, and the dust removal method is wet dust r...

AI Technical Summary

Problems solved by technology

[0003] (1) Defects in the wet purification and recovery (OG method) process: the heat released by the cooling of converter gas above 900°C is absorbed by water, and the dust removal method is wet dust removal, which consumes a lot of water; converter gas below 900°C Sensible heat is wasted, and waste heat recovery efficiency is very low

[0004] (2) Defects in the semi-dry purification and recovery process: the evaporative cooler needs to atomize the cooling water. Since the evaporative cooler has high requirements on the atomization effect of the water, the evaporative cooler uses nitrogen as the mist of the cooling water chemical agent, the nitrogen consumption per ton of steel is as high as 25Nm 3 , high nitrogen consumption; because the evaporative cooler uses limestone for steelmaking, calcium oxide is produced after thermal decomposition inside the converter, and calcium oxide is easy to absorb moisture inside the evaporative cooler, and it is easy to stick to the wall of the evaporative cooler. The internal dust accumulation of the evaporative cooler is serious, and it needs to be cleaned regularly (usually once a week); the spray gun of the evaporative cooler needs to be replaced regularly, and the spray gun needs to be replaced once every 8 months or so

Since the spray gun will burst if used for too long, it needs to be replaced regularly; the flue contains a large amount of water vapor, which makes the dust easy to stick to the electrode line, which affects the dust removal effect of the electrostatic precipitator; the evaporative cooler uses nitrogen The method of atomization will reduce the concentration of CO (by about 8%; the sensible heat of converter gas below 900 ℃ is wasted, and the sensible heat recovery rate of converter gas is very low

[0005] In summary, compared with the wet process, the semi-dry purification recovery process saves a lot of water resources, but the nitrogen consumption is higher, the operation stability of the evaporative cooler and the electrostatic precipitator is poor, and the sensible heat recovery rate of the converter gas very low

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