Tank top vocs recovery and nitrogen reuse system and method

Abstract

The invention discloses a tank top VOCs recovery and nitrogen reuse system and method. The system includes a pressurization subsystem, a condensation subsystem, a pressure swing adsorption subsystem and a nitrogen recovery subsystem. The pressurization subsystem includes a pressurization air pump And flame arrester, condensation subsystem includes recuperator heat exchanger, pre-cooling heat exchanger, shallow cooling heat exchanger, cryogenic heat exchanger, explosion-proof refrigeration compressor, condensation heat exchanger, evaporation condensation heat exchanger and throttling Components, etc., the pressure swing adsorption subsystem includes more than two sets of parallel pressure swing adsorption devices, and the nitrogen recovery subsystem is composed of a nitrogen buffer tank and a one-way valve. The present invention uses the pressurized recuperation heat exchanger, pre-cooling heat exchanger, shallow cooling heat exchanger, and deep cooling heat exchanger to carry out gradual cooling and condensation, pressure swing adsorption recovery and purification of VOCs gas on the top of the tank, and finally VOCs are recycled and utilized , The nitrogen on the top of the tank is purified and reused, and the unit has no secondary pollution during operation.

Description

technical field [0001] The present invention relates to a tank top VOCs recovery and inert gas recycling system and method, in particular to a nitrogen sealing tank top gas recovery and nitrogen recycling system and method. Background technique [0002] In oil refining and petrochemical plants, various oil products or petrochemical products are stored. Most of the storage tanks are built outdoors. In order to avoid direct contact of these materials with the air, to prevent volatilization and oxidation of the materials, and to ensure the safety of the container, a nitrogen sealing device is often used to keep the nitrogen pressure at the top of the container constant and to isolate it from the outside world. In addition, in order to reduce the loss of material volatilization caused by small breathing and large breathing during storage tank storage, a nitrogen blanketing device is also used. [0003] The treatment of VOCs waste gas on the top of the tank is carried out in an ...

AI Technical Summary

Problems solved by technology

Chinese patent CN201721880896.2 discloses a device for recovering and utilizing VOCs gas discharged from a fixed-roof storage tank. The device uses a combination of alkali cleaning unit, recovery unit and fuel gas pipeline network to solve the problem of VOCs emission standards, but the fuel gas loss is great

So far, there is no zero-emission system on the market that can meet the recovery of VOCs in the tank roof VOCs gas and reuse the nitrogen gas sealed on the tank roof

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