In the process of chemical production, distillation non-condensable gas, reaction pressure relief exhaust, vacuum desoluble exhaust gas, material replacement exhaust gas and other points will produce a large number of high-concentration organic exhaust gas, which is rich in dichloromethane, ethyl acetate, acetone, alcohols, ketones and other high-value organic solvents. This kind of exhaust gas organic components accounted for a high proportion, with significant recovery value, but the exhaust process gas volume fluctuations are obvious, instantaneous impact load is large, the air flow often entrained solvent droplets, aerosols, some operating conditions contain halogenated acidic corrosive medium. If the high concentration of tail gas is directly disposed of, it will not only cause considerable material waste, increase the cost of raw material procurement, but also bring the safety risk of combustible gas accumulation in the workshop, and can not meet the requirements of environmental protection emission control.
Traditional treatment process in the face of chemical high concentration tail gas has obvious limitations. The incineration process directly destroys the recyclable solvent and converts the reusable material into waste, resulting in huge resource loss. The combustion of halogen-containing medium will generate corrosive by-products, high energy consumption of the equipment, and large investment in later operation and maintenance.activated charcoalThe adsorption process is not suitable for high-concentration conditions, high-load air flow can easily cause the adsorption material to quickly saturate the plate, the risk of heat fire increases significantly, the amount of hazardous waste generation surges, can only be used as an auxiliary treatment means, can not achieve solvent recovery and cost reduction. The single condensation process relies on low-temperature liquefaction to recover the solvent, but is constrained by the partial pressure of steam, the recovery effect fluctuates obviously when the gas volume fluctuates sharply, the concentration of residual tail gas is high, and it is difficult to achieve stable emission standards.
Chemical high-concentration exhaust liquefaction recovery cost-effective exhaust gas treatment equipment using compression-condensation-film coupling full physical process, the whole process without combustion, no chemical reaction, no secondary pollutants. The high-concentration exhaust gas discharged from the production device is collected centrally through a closed negative pressure pipeline and sent to a buffer pressure stabilization unit to eliminate the pressure and gas volume impact caused by the instantaneous exhaust gas, stabilize the intake condition of the equipment, and weaken the disturbance of the high-concentration pulse air flow to the system.
The tail gas enters the multi-stage pretreatment system to remove solvent droplets, fine aerosols and free moisture from the air stream step by step, to prevent impurities from entering the core components such as compressors, heat exchangers and membrane modules, to reduce corrosion, scaling and blockage failures, and to ensure the long-term reliable operation of the entire equipment. The pre-treated exhaust gas is compressed and pressurized, the organic vapor partial pressure is increased, the solvent liquefaction phase change conditions are improved, and it is sent to the multi-stage gradient condensation unit, which is graded and cooled according to the boiling point difference of different solvents, and most of the organic components are directly liquefied and precipitated, completing the main recovery of the solvent.
After condensation, the remaining low-concentration organic tail gas enters the membrane separation unit, and the organic vapor is enriched by the permeability selectivity of the polymer membrane material, the purified tail gas reaches the emission target, and the concentrated high-concentration organic gas stream is recycled to the front end of the equipment for recycling, further increasing the comprehensive solvent recovery rate of the whole system. The recovered liquid solvent is separated into water, filtered and purified, and the quality meets the production reuse standard. It can be returned to the production process for recycling, directly reducing the enterprise's solvent procurement expenses, reducing the amount of hazardous waste disposal, and realizing the simultaneous landing of waste gas treatment and economic benefits.
The equipment can adopt the form of skid-mounted integration, complete assembly, pressure test and explosion-proof calibration in the factory, and the whole machine leaves the factory. The site only needs to connect with the original tail gas pipeline, with less civil construction, short installation and commissioning period, and low impact on the continuous production of the enterprise. It can not only support the new chemical plant, but also be used for the technical renovation project of high concentration tail gas treatment in the old factory area. The whole machine is designed according to the chemical class a explosion-proof standard, all electrical components reach the explosion-proof level, and the corresponding anti-corrosion materials are selected for the pipelines and components contacting the medium. The system is equipped with over-temperature, over-pressure, combustible gas detection interlock protection and emergency vent bypass to deal with high concentration impact and other sudden working conditions to eliminate potential safety hazards. The intelligent frequency conversion control system can dynamically adjust the operating power according to the exhaust gas concentration and air volume, optimize the energy consumption level, and support long-term unattended operation. According to the on-site exhaust gas composition, air volume parameters and site space, the process parameters can be customized and adjusted to adapt to various chemical high-concentration organic exhaust gas resource treatment projects.
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