LPG-related tank car cleaning device and method based on pressure swing adsorption technology

Abstract

The invention discloses an LPG-related tank car cleaning device and method based on pressure swing adsorption technology, the first step is a nitrogen purging subsystem, the second step is a waste gas recycling subsystem, and the waste gas recycling subsystem comprises a buffer tank and a double-tower pressure swing adsorption device. Residual media in the tank enter a buffer tank along with nitrogen after being purged and then enter adsorption towers after being compressed by a compressor, organic matters are effectively separated under adsorption pressure, purified exhaust reaching the standard enters a first-step purging pipeline for cyclic utilization, if exhaust from the first adsorption tower does not reach the standard, the exhaust enters a second adsorption tower for adsorption. meanwhile, the first adsorption tower is subjected to depressurization desorption, and desorbed exhaust enters a residual liquid tank to be recycled. Hydration-free cleaning of the tank car can be achieved, emission of harmful gas is reduced, residual oil media which are difficult to treat in the LPG vehicle are recycled, and energy conservation and environment protection are achieved; and meanwhile, the equipment investment is low, the operation is simple, the running time is long, and the device is particularly suitable for LPG tank car detection units or hazardous chemical parking lots.

Description

technical field [0001] The invention relates to an LPG tank car cleaning device and method, in particular to an LPG tank car cleaning device and method based on pressure swing adsorption technology. Background technique [0002] LPG tanker is a means of transport for liquefied petroleum gas. It is a mobile pressure vessel. The storage tank of the tanker is a pressure vessel for transporting flammable and explosive media. The safety inspection and regular inspection of LPG tanker are stipulated in national regulations and standards. There are clear regulations, and before safety inspections and regular inspections, the cleaning of tank cars is a necessary prerequisite. Under the situation that the country pays more and more attention to safety and environmental protection, the cleaning of LPG tank cars has been a fundamental problem that has plagued the industry for many years. [0003] Most users of LPG tankers use hot water immersion for air replacement or inert gas replace...

AI Technical Summary

Problems solved by technology

This method provides a possibility for the cleaning of tank trucks, but this method needs to be heated first and then condensed, which consumes a lot of energy; the combined application of condensation method and membrane separation method requires complicated equipment; the separation method requires large investment and expensive equipment , the life of the membrane is short, the separation device requires stable voltage and flow, and the operation requirements are high

It is not a cost-effective cleaning method for LPG tanker cleaning

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