Efficient energy-saving large-air-quantity low-concentration organic waste gas recovery and treatment device and method

Abstract

The invention discloses an efficient energy-saving large-air-quantity low-concentration organic waste gas recovery and treatment device and method. The recovery and treatment device comprises a pretreatment system and an adsorption and purification device, the output end of the pretreatment system is connected with a waste gas inlet of the adsorption and purification device through an adsorption and purification fan, and the adsorption and purification device is an adsorption and purification fixed bed or a zeolite rotary wheel adsorption and purification system. A recovery device further comprises a first heat exchanger, a first cooler, an adsorption recovery bed, a condenser, a layering tank, a solvent recovery tank, a heater, a first dried filter, a dehumidifying fan and a cooling fan. The recovery and treatment method includes the steps of firstly, pretreatment, secondly, adsorption and purification, thirdly, adsorption and concentration, fourthly, cooling and adsorption and fifthly, adsorption and recovery. By means of multi-stage reuse of heat and multi-stage adsorption of organic waste gas, the effects of reducing energy consumption and improving recovery efficiency are achieved, the device and method are particularly suitable for large-air-quantity low-concentration organic waste gas recovery and treatment, the aim of clean production is achieved, recycling of resources are achieved, and environment protection is achieved while energy is saved and emission is reduced.

Description

technical field [0001] The invention relates to a device and method for recycling and treating organic waste gas, in particular to a device and method for recycling and treating organic waste gas with high air volume and low concentration, which are highly efficient and energy-saving. Background technique [0002] Organic waste gas is mainly produced in the production process of painting, printing, chemical industry, shoe-making glue, paint, etc., and these organic waste gases will be discharged indirectly or directly in the form of waste gas. The organic waste gas needs to be purified before it will pollute the environment. [0003] At present, there are many kinds of organic waste gas treatment processes, including adsorption method, biological method, UV photolysis, catalytic combustion method, absorption method, and direct combustion method. However, for organic waste gas with large air volume and low concentration, the adsorption-catalytic combustion method is still the ...

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Problems solved by technology

[0003] At present, there are many kinds of organic waste gas treatment processes, including adsorption method, biological method, UV photolysis, catalytic combustion method, absorption method, and direct combustion method. However, for organic waste gas with large air volume and low concentration, the adsorption-catalytic combustion method is still the main method. However, this process has the following disadvantages: 1. The operating cost is high, because it needs to raise the temperature of the exhaust gas to above 280 degrees Celsius to carry out more efficient catalytic combustion. The demand for temperature rise will inevitably cause a large amount of energy consumption. Many enterprises use this After the process, the energy consumption of the system cannot be borne; 2. The valuable solvent cannot be recovered. The organic waste gas contains a large amount of valuable recyclable solvent components. The catalytic combustion method is only for the solvent components in it. Oxidative decomposition of carbon diox

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