Heat treatment process oil gas recovery device and method

Abstract

The invention provides a heat treatment process oil gas recovery device and a method. The method includes the steps that oil gas discharged by a heat treatment furnace is intensively collected througha pipeline, and the collected hot oil gas is subjected to multi-section heat exchange and cooling, so that rolling oil in the oil gas is condensed and separated out; multi-section heat exchange is carried out on the gas subjected to deep cooling and rolling oil removal again, heat exchange and temperature rise are carried out on the gas and hot oil gas exhausted by the heat treatment furnace, andthe heated gas enters into the heat treatment furnace to replace the hot oil gas; and an exhaust system and an air inlet system of the heat treatment furnace form a closed loop, inert gas is introduced into the closed loop to replace internal air, and inert gas such as liquid carbon dioxide or liquid nitrogen is introduced into the coldest end to deeply cool the oil gas. According to the heat treatment process oil gas recovery device and the method, pollution of the oil gas evaporated and discharged in the heat treatment process to the atmosphere can be eliminated, the rolling oil can be recycled, meanwhile, power consumption of the heat treatment furnace can be greatly reduced, and potential safety hazards caused by discharging of the hot oil gas are eliminated.

Description

technical field [0001] The invention belongs to the field of metal processing, and in particular relates to an oil gas recovery device and method in the heat treatment process after aluminum foil rolling. Background technique [0002] In the rolling process of aluminum foil and aluminum plate, rolling oil is an essential auxiliary raw material, and heat treatment is an essential key process. Rolling oil is mainly composed of base oil and additives. It mainly plays the role of lubricating, cleaning and cooling aluminum foil. The processing of each ton of aluminum foil requires about 60kg of rolling oil. The consumption of rolling oil is mainly in several ways: rolling process Evaporation by heating, natural evaporation during the stacking process of aluminum foil, heat treatment evaporation on the surface of the aluminum foil, oily waste generated during the filtration and refining process, scrapping of rolling oil, etc. Among them, the heat evaporation in the rolling proces...

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Problems solved by technology

According to the type and size of the aluminum foil, the heat treatment process of the aluminum foil usually takes 1-15 days, and precise heating and heat preservation in the furnace is required, generally at 200-230°C. Blowing in air and discharging high-temperature oil and gas will inevitably cause heat loss in the furnace, which requires a lot of power consumption to control the temperature

Therefore, in the current heat treatment process of aluminum foil processing, based on an average of 1-5kg of rolling oil per ton of aluminum foil, 10-50 tons of VOC will be produced for every 10,000 tons of aluminum foil produced. These rolling oils contain aromatics and sulfur. It will cause serious pollution to the atmosphere; in addition, the continuous use of normal temperature air to replace the high temperature oil and gas in the furnace will cause a lot of waste of electricity

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