Green cleaning device and method for hazardous chemical tanker based on VOCs separation and recovery technology

Abstract

The invention discloses a green cleaning device and method for hazardous chemical tanker based on VOCs separation and recovery technology, and the method comprises the steps of nitrogen purging, condensation recovery, molecular sieve adsorption, exhaust emission and molecular sieve desorption. Opening and closing of a valve is adjusted by values in two VOCs online detectors. Whether the exhaust enters a circulating system to be circulated or enters a catalytic oxidation device to be subjected to oxidation treatment and discharged is determined, if the concentration of the VOCs in an outlet of the tanker is reduced to 0.2 v% or below or the concentration of the VOCs in an outlet pipeline of the molecular sieve device exceeds 0.2 v% or above, the exhaust enters the catalytic oxidation device, and otherwise, the exhaust enters a purging system to be subjected to circulating purging. According to the invention, hydration-free cleaning of the tanker can be realized, discharge of harmful solid waste liquid and waste is reduced, residual oil medium difficult to treat in the oil gas vehicle is recovered, and the invention is energy-saving, environment-friendly and safe and stable in operation.

Description

technical field [0001] The invention relates to a cleaning device and method for tank cars involving hazardous chemicals, in particular to a green cleaning device and method for tank cars involving hazardous chemicals based on VOCs separation and recovery technology. Background technique [0002] Under the situation that the country pays more and more attention to safety and environmental protection, the cleaning of hazardous chemical tank trucks has been a fundamental problem that has plagued the industry for many years. Most oil and gas tanker users still adopt the traditional method of air replacement after repeated immersion in hot water for cleaning. The process will not only produce a large amount of oily wastewater, but also generate VOCs, causing serious pollution to the surrounding environment. [0003] At present, the cleaning methods of oil and gas storage and transportation equipment mainly include manual cleaning, chemical cleaning and mechanical cleaning. For ...

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Problems solved by technology

It is loose and porous, with a large specific surface area and a large pore volume, but activated carbon has the disadvantages of being flammable, and its adsorption performance is greatly affected by water vapor, and it needs to be replaced regularly.

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