CN105311923A

CN105311923A - VOC (volatile organic compound) gas recovery system

Info

Publication number: CN105311923A
Application number: CN201510782431.2A
Authority: CN
Inventors: 贾崇启
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-11-16
Filing date: 2015-11-16
Publication date: 2016-02-10

Abstract

The invention relates to a VOC (volatile organic compound) gas recovery system which comprises a storage tank used for storing an organic liquid, and further comprises a compressor, a buffer tank, a condenser, an air heat exchanger, a membrane separator, a filter and a condensed liquid tank, wherein an organic vapor volatilized from the storage tank is compressed by the compressor; the compressed vapor enters the condenser containing cooling water after passing through the buffer tank; part of macromolecular organic materials are condensed into a liquid I; the liquid I enters the condensed liquid tank; while gaseous substances which are not condensed enter the air heat exchanger to rise environmental temperature by heating air and enters the membrane separator; organic gas molecules in the gaseous substances return to the storage tank through a molecular membrane return pipeline, while other nitrogen-containing gas meeting emission requirements is filtered by the filter, and the filtered gas is emitted into the atmosphere. According to the VOC gas recovery system, gas volatilized from the organic liquid stored in the storage tank is recovered through tertiary treatment of condensation, membrane separation and filtration, so as to ensure that the nitrogen-containing gas emitted into the atmosphere confirms to the emission standard.

Description

A kind of VOC gas recovery system

Technical field

The present invention relates to a kind of gas recovery system, be specifically related to the organic gas recovery system of organic non-methane hydrocarbon.

Background technology

Along with China's industrialization development is to certain phase, environmental pollution becomes more and more outstanding social concern, particularly a lot of Organic Chemical Plants, and accumulating factory is when storage is considered to not have virose organic liquid, naturally volatilization is all directly enter air, severe contamination environment.Volatile organic matter (VOCs) discharge is reduced in order to impel enterprise, improve VOCs pollution control technology, make the life better and eco-environmental quality, according to " The Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution ", " Administrative Regulations on Pollution Discharge Fee Levy ", the regulations such as " State Council is about the notice printing and distributing prevention and control of air pollution action plan " (No. (2013) 37, promulgated by the State Council), increase pilot industry VOCs pollution charge way has been formulated in June, 2015, NMHC (alkane is mainly comprised to having volatile organic compound, alkene, alkynes, aromatic hydrocarbon), oxygen-containing organic compound (aldehyde, ketone, alcohol, ether etc.), halogenated hydrocarbons, nitrogen-containing compound, the products such as sulfur-containing compound are discharged in air and charge, this regulation proposes more harsh requirement to petroleum chemical enterprise's environmental emission.

But existing a lot of organic exhaust gas flow processs are too simple, do not reach GB discharge standard after process at all, be necessary that carrying out innovation improves.

Summary of the invention

The present invention seeks to produce pollution on the environment problem in storage and transport process for solving organic chemical industry, provide a kind of VOC gas recovery system of improvement, be conducive to reducing the burden on enterprises, protection health of people, meets the needs of social development.

The present invention solves its technical problem and is achieved through the following technical solutions:

A kind of VOC gas recovery system, comprise the storage tank storing organic liquid, also include compressor, surge tank, condenser, air heat exchanger, membrane separator, filter and lime set tank, store the organic steam of the storage tank volatilization of organic liquid through compressor compresses, the condenser by cooling water is arrived again through surge tank, part larger molecular organics is condensed into liquid phase and enters lime set tank, the gaseous substance be not condensed enters air heat exchanger, by air heat to environment temperature, enter membrane separator, wherein organic gas molecule gets back to storage tank through molecular film reflux line, what other contained nitrogen emission gases can enter air after filter.

The compressor adopted is liquid rotary compressor, and filter comprises molecular sieve filter and active carbon filter, and the condenser of employing is by water quench, and the gaseous substance after condenser enters air heat exchanger and is heated to environment temperature.

Technique scheme can be found out, owing to the present invention is directed to the different component of organic tail gas, have employed perfect treatment measures, the component VOCs content being discharged into air is former in discharging standards 120mg/m2, solves current most of organic tail gas absorption plant weak effect, loses time, the shortcoming such as contaminated environment.

This organic gas recovery technology, solves current organic tail gas poor processing effect, loses time, the shortcoming such as contaminated environment, really achieves the qualified discharge of organic non-methane hydrocarbon.

Accompanying drawing explanation

Fig. 1 is schematic flow sheet of the present invention.

Indicate in figure: 1, storage tank, 2, compressor, 3, surge tank, 4, condenser, 5, air heat exchanger, 6, membrane separator, 7, molecular sieve filter, 8, active carbon filter, 9, lime set tank.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.

See Fig. 1, a kind of VOC gas recovery system, comprises the storage tank 1 storing organic liquid, compressor 2, surge tank 3, condenser 4, air heat exchanger 5, membrane separator 6, molecular sieve filter 7 and active carbon filter 8 and lime set tank 9.In order to better sealing in application, the compressor 2 of employing is liquid rotary compressor.

During recovery system work, the organic steam that the storage tank 1 storing organic liquid volatilizees compresses through compressor 2, the condenser 4 by cooling water is arrived again through surge tank 3, part larger molecular organics is condensed into liquid phase and enters lime set tank 9, the gaseous substance be not condensed enters air heat exchanger 5, by air heat to environment temperature, enter membrane separator 6, by the pressure-control valve in membrane separator 6 downstream, membrane separator 6 inside is made to keep certain pressure differential 3 ~ 10barg, organic gas molecule can enter through molecular film the low-pressure side being rich in organic gas, then storage tank 1 is got back to through reflux line, not by the on high-tension side gas mainly nitrogen of molecular film, air is entered after molecular sieve filter 7 and active carbon filter 8, in adsorption process, active carbon filter 8 and molecular sieve filter 7 ensure certain pressure 2.5 ~ 3.0barg by the pressure-regulating valve in downstream.

VOC gas recovery system of the present invention, to the volatilization gas of organic liquid stored through condensation, UF membrane, filter tertiary treatment reclaim, ensure that being discharged in air is standard compliant nitrogenous gas, efficiently solve current organic tail gas poor processing effect, lose time, the shortcoming such as contaminated environment, really achieve the qualified discharge of organic non-methane hydrocarbon.

Claims

1. a VOC gas recovery system, comprise the storage tank (1) storing organic liquid, it is characterized in that: also include compressor (2), surge tank (3), condenser (4), air heat exchanger (5), membrane separator (6), filter and lime set tank (9)

The organic steam that the storage tank (1) storing organic liquid volatilizees compresses through compressor (2), the condenser (4) by cooling water is arrived again through surge tank (3), part larger molecular organics is condensed into liquid phase and enters lime set tank (9), the gaseous substance be not condensed enters air heat exchanger (5), by air heat to environment temperature, enter membrane separator (6), wherein organic gas molecule gets back to storage tank through molecular film reflux line, and what other contained nitrogen emission gases can enter air after filter.

2. VOC gas recovery system according to claim 1, is characterized in that: the compressor (2) of employing is liquid rotary compressor.

3. VOC gas recovery system according to claim 1, is characterized in that: described filter comprises molecular sieve filter (7) and active carbon filter (8).

4. the VOC gas recovery system according to Claims 2 or 3, is characterized in that: the condenser of employing is by water quench, and the gaseous substance after condenser enters air heat exchanger and is heated to environment temperature.

5. VOC gas recovery system according to claim 4, is characterized in that: film separation system will guarantee the pressure reduction of 3 ~ 10barg.

6. VOC gas recovery system according to claim 5, is characterized in that: in adsorption process, and active carbon filter (8) and molecular sieve filter (8) ensure certain pressure 2.5 ~ 3.0barg by the pressure-regulating valve in downstream.