Closed submerged arc furnace coal gas dry-process purifying and recycling system

Abstract

The invention relates to a closed submerged arc furnace coal gas dry-process purifying and recycling system which comprises a closed submerged arc furnace 1, an air natural cooler 3, a bag filter 4, a water-cooled type condensation drainer 5, a coal gas draught fan 6, a coal gas cabinet 7 and an automatic control system 11. The closed submerged arc furnace 1, the air natural cooler 3, the bag filter 4, the water-cooled type condensation drainer 5, the coal gas draught fan 6 and the coal gas cabinet 7 are sequentially connected through carbon steel pipes. The connecting pipeline between the closed submerged arc furnace 1 and the air natural cooler 3 and the connecting pipeline between the coal gas draught fan 6 and the coal gas cabinet 7 are provided with switching valves 2. A furnace cover of the closed submerged arc furnace 1 is provided with a furnace pressure measuring device 10. The automatic control system 11 is connected with the devices and the valves through signal lines. The dust content of coal gas purified through the system is smaller than 10 mg / m<3>, and investment and running energy consumption are low; the water content of the recycled coal gas is low, and the heating value is high; no waste water problem or sludge problem exists, and no corrosion, blockage, freeze or other running faults exist; furnace pressure is controlled accurately, and running is safely and reliably conducted in place; occupied area is small, and technical transformation is facilitated.

Description

technical field [0001] The invention relates to a closed submerged arc furnace gas dry purification and recovery system, which belongs to the new technology in the field of environmental protection, and is especially suitable for dry gas purification and recovery of closed electric furnaces in the ferroalloy industry and calcium carbide furnaces in the chemical industry. Background technique [0002] Ferroalloy is an indispensable material for steelmaking as a deoxidizer and additive for steelmaking; calcium carbide is an important chemical raw material, mainly used to produce acetylene gas, and also used in organic synthesis, oxyacetylene welding, etc. [0003] Ferroalloy electric furnace and calcium carbide furnace are collectively referred to as submerged arc furnace, and the furnace structure and smelting process are similar. The gas temperature of the closed submerged arc furnace is high and fluctuates greatly. The normal working condition temperature is 150-450°C, and ...

AI Technical Summary

Problems solved by technology

Wet purification mainly has the following problems: ① low purification efficiency, high dust content in gas, and can not meet environmental protection discharge standards; ② large water consumption, high investment in sewage treatment, high energy consumption in operation, high product cost, and no market competition Advantages; ③The gas has high water content, low calorific value, and low quality; ④The washing water pipeline and equipment are often blocked, corroded or frozen, and the furnace is frequently shut down for maintenance, which affects normal production

The disadvantages of this process are: ①The diameter of the cooling tubes of the air mechanical cooler is small (100-150mm), and it is often blocked during operation; multiple axial fans are used for forced cooling, which consumes electric energy; ②The secondary cooling of the condenser belongs to Although the cooling method of direct spraying water can reduce the temperature and precipitate tar and water, it needs to consume water resources and cause water treatment problems

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