Reactor VOCs tail gas liquefaction recovery chemical waste gas resource recovery device | Luoyang Wo Hong Petrochemical.

The fine chemical reactor will continue to discharge a large amount of VOCs organic tail gas during the operation stages of feeding, reaction temperature rise, pressure relief, vacuum pumping, discharging, etc. The waste gas components mostly contain flammable and explosive organic solvents such as dichloromethane, ethyl acetate, acetone, tetrahydrofuran, alcohol ketones, etc. The exhaust of the reaction kettle has obvious intermittent characteristics, the pulse of gas volume and concentration will appear at the moment of feeding and pressure relief, the solvent mist droplets and aerosols are often entrained in the air flow, some working conditions contain halogenated corrosive medium, and the working conditions change complex. If the tail gas treatment scheme is not matched properly, it will not only cause a large amount of solvent material loss, increase the cost of raw material procurement, but also have potential safety hazards in the workshop, and it is difficult to stably meet the environmental emission requirements.

There are many shortcomings in the traditional treatment process for the treatment of reactor tail gas. The incineration process directly destroys recyclable organic solvents, resulting in serious waste of resources. The combustion of halogen-containing media will generate corrosive by-products, and the energy consumption of equipment and the cost of later operation and maintenance remain high.activated charcoalAdsorption only realizes the transfer of pollutants, can not complete the solvent recycling, pulse high concentration air flow is easy to cause the adsorption layer consolidation saturation, there is a risk of heat accumulation fire, the operation process continues to produce dangerous solid waste. The single condensation process is limited by the partial pressure of organic steam, and in the face of the tail gas of the reactor instantaneous high-low concentration alternation, the recovery efficiency fluctuates greatly, and it is difficult to achieve full-cycle stable management.

The reactor VOCs tail gas liquefaction recovery chemical waste gas resource recovery device adopts the compression-condensation-film coupling full physical process, the whole process without combustion, no chemical reaction, no secondary pollutants. The organic tail gas generated by the reactor pressure relief and each process is collected through a closed negative pressure pipeline and connected to a buffer pressure stabilizing unit to buffer the pressure and gas volume impact brought by the moment of pressure relief, stabilize the working conditions of the main engine, and avoid the disturbance of the whole system caused by pulse air flow.

The tail gas enters the multi-stage pretreatment unit to remove liquid droplets, aerosol impurities and free moisture carried by the airflow, protect the core precision components such as compressors, heat exchangers, and membrane modules, reduce corrosion, scaling, and blockage failures, and extend the service life of the equipment. After pre-treatment, the exhaust gas is compressed and pressurized, the organic vapor partial pressure is increased, the solvent liquefaction phase change conditions are improved, and then enter the multi-stage gradient condensation unit, according to the difference of the boiling point of different solvents, the temperature is reduced, and most of the organic components are liquefied and separated to complete the recovery.

The remaining low-concentration tail gas after condensation is sent to the membrane separation unit, which relies on the permeability selectivity of the polymer membrane material to complete the enrichment of organic components, the purified tail gas meets the emission requirements, and the concentrated high-concentration organic gas flow is recycled to the front end of the equipment to further improve the overall recovery efficiency of the mixed solvent. After water separation, filtration and purification, the quality of the recovered liquid solvent reaches the production reuse standard, and can be sent back to the reactor production process for recycling, reducing the cost of solvent procurement, reducing the output of hazardous waste, and realizing waste gas treatment and material recovery.

The whole set of equipment can adopt skid-mounted integrated structure, the factory completes assembly, pressure test and explosion-proof calibration, and the whole machine leaves the factory. The site only needs to connect the original tail gas pipeline of the reactor, the construction amount is small, the transformation period is short, and the normal production of the workshop will not be disturbed too much. It is not only suitable for the new production line, but also can be used for the upgrading and transformation of the old reactor system. The equipment shall be designed in accordance with Class A explosion-proof standard for chemical industry, the electrical components shall meet the explosion-proof requirements, and the contact medium parts shall be made of suitable anti-corrosion materials. The system is equipped with over-temperature, over-pressure, combustible gas detection interlock protection and emergency venting bypass to deal with abnormal conditions such as sudden pressure relief of the reactor and avoid safety risks. The intelligent frequency conversion automatic control system can dynamically adjust the operating load following the intermittent exhaust of the reactor, reduce energy consumption, and support unattended operation. Can be combined with the reactor specifications, exhaust components, instantaneous gas volume, site space conditions customized process configuration, suitable for medicine, fine chemical all kinds of reactor exhaust resource project landing.