Organic waste gas recycling device and method

Abstract

The invention discloses an organic waste gas recycling device. The device comprises an adsorption fan, a dust removal filter, a first heat exchanger, an adsorption / desorption device, a nitrogen production unit and a low-temperature liquid storage tank, which are sequentially connected, the first heat exchanger is also connected with an oilless air compressor; the oilless air compressor is connected with a second heat exchanger; the low-temperature liquid storage tank and the first refrigerating unit are respectively connected with the second heat exchanger; a plurality of adsorption / desorptioncavities are formed in the adsorption / desorption device; electric heating plates are arranged on the two sides of each adsorption / desorption cavity. The organic waste gas recycling method comprises the steps of dehydration before adsorption, low-temperature adsorption, thermal-storage desorption under protective gas, recovery through pressurized condensation, and active cooling adsorption tower treatment. According to the device and the method, the cost and the energy consumption of the waste gas recycling device are reduced, and meanwhile, the waste gas recycling efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of waste gas recovery, in particular to an organic waste gas recovery and reuse device and method. Background technique [0002] In the process of modern industrial production, various organic waste gases (VOCs) will be produced. If they are directly discharged into the atmosphere without harmless treatment or recycling, they will inevitably cause different degrees of pollution to the environment and aggravate the air pollution. The formation of smog poses a serious threat to human health. In addition, the emission of some organic waste gases will also cause damage to the atmospheric ozone layer, directly threatening the safety of the earth's biological environment; some organic waste gases are greenhouse gases, and a large amount of emissions will also cause the temperature of the earth's surface to rise; many organic waste gases are toxic gases , direct emissions threaten human health. Therefore, it is v...

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Problems solved by technology

Condensation adsorption method, physical absorption method and membrane separation method have high investment costs and high energy consumption during operation; direct combustion method cannot recover valuable organic vapor, has no economic benefits, and can only be limited to high-concentration oil and gas that are easy to burn, etc. , the scope of application is limited; the conventional adsorption and desorption method for organic waste gas with high boiling point, high molecular polarity or high solubility in water, using water vapor desorption, the effect is very poor, such as some alcohols or halogenated hydrocarbon organic waste gas, etc.; using vacuum Desorption, because desorption is an endothermic process, and the heat transfer efficiency of activated carbon and molecular sieve is low, so the heat energy cannot be quickly supplemented, so the desorption effect is also very poor, and it can only be applied to the desorption of a very small part of organic waste gas. The effective life of the adsorbent is significantly shortened if the adsorption is not complete; the heating efficiency is low by using hot air (nitrogen) circulation heating, and the desorbed organic waste gas is difficult to efficiently recover and reuse through the condensation method due to its low concentration, otherwise it must be passed The multi-stage condensation method uses extremely low condensation temperature to obtain a certain recovery efficiency; the use of catalytic combustion method to burn the desorbed organic waste gas can recover heat energy and achieve environmental protection and discharge standards, but the catalyst used in catalytic combustion needs to be used under high temperature conditions. It is easy to be poisoned and the technology is not very mature. For organic waste gas with high economic value, it cannot be recycled and reused, which is also a waste

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