Adsorption - Absorption Type Voc Treatment System Vapor Recovery Unit Design

Adsorption - Absorption Type Voc Treatment System Vapor Recovery Unit Design

Adsorption-Absorption Type Vapor Recovery Unit

* Summary

Vapor Recovery Unit is to collect the organic vapor discharged during the manufacturing, storage, loading and unloading processes of various industries and recycle it by means of condensation, adsorption, absorption, membrane separation, etc. so as to finally satisfy the emission standards and create certain economic benefits for the end user.

The oil vapor handled by adsorbent will satisfy the emission standard and be discharged directly. The organics separated will be adsorbed and enriched in the adsorbent. When the adsorbent is nearly saturated, vacuum will be created to have the oil vapor adsorbed released from the adsorbent. The oil vapor released will be absorbed by liquid oil spray and then returned to the product oil tank or raw material tank for the purpose of oil vapor recovery.

Adsorption process is ideal for the oil vapor of low concentration. The emission after treatment can satisfy stringent national or local standards. The Adsorption-Absorption Process is featured by reduced investment, easy operation, high recovery efficiency and low energy consumption.

Principle / Flow Procedure

Taking advantage of different bonding force between the various compositions and the adsorbent, the adsorption process can first separate those difficult to be adsorbed from the others and then the organics apt to be adsorbed get enriched in the adsorbent. Clean emission after treatment then is directly discharged into the atmosphere. When the absorbent is nearly saturated, a vacuum atmosphere will be created in the adsorption tank by a dry screw vacuum pump so that the compositions collected in it vaporize and escape. The oil vapor released is then led to the absorption tower and caught in the absorbent. The liquid oil recovered can be delivered to the product tank or raw material tank requiring no further separation and purification. The absorbent SMDERI uses is the coal based dedicated activated carbon of oil vapor.

Structure & Parameter (typical project)

Advantage

1) Software: ASPEN for process calculation, SW6 for equipment calculation, CADworx for design of          the skid;

2) Started R&D since 2007, built a test platform, accumulated plenty of analysis and research data;

3) Built projects are compliant with current emission standard. Plenty of project experience;

4) 3 tanks + 2 stage adsorption, the exhaust gas meets the emission standard;

5) Automatic switchover between adsorption and desorption;

6) Multi point of temperature monitor for adsorption tank, equipment safety is assured;

7) Dry screw vacuum pump used for desorption, high vacuum degree, no contamination of oil or              water, wear free operation;

8) High efficiency structured packing and low consumption of absorbent;

9) Delivered as a skid to reduce site installation work;

10) Fully sealed blower and flanged connection in the skid to achieve zero leakage;

      11) ExdIIBT4 or ExdIICT4 explosion proof.

Applied data for an typical project

---- Concentration of emission: Compliance with GB31570-2015 <Standard of pollutant emission           for oil refinery industry>, GB31571-2015 <Standard of pollutant for petrochemical industry> and           the related local standard.

---- Details:

      Benzene ≤ 4mg/m³,

      Toluene ≤ 15mg/m³,

      Xylene ≤ 20mg/m³,

      Ethylbenzene ≤ 100mg/m³,

      Acetonitrile ≤ 50mg/m³;

      Non-methane total hydrocarbons:

- Removal rate ≥ 97%,

- Concentration of emission ≤ 120mg/m³;

      Noise (1m from VRU): ≤ 85dB (A)

      Height of exhaust port: ≥ 15m.