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 dioxide and water into small molecules cannot recover its valuable components; 3. The operation stability and safety are not good, because the catalytic combustion process needs to be operated under high temperature conditions, and the concentration of the exhaust gas treated is unstable Unstable processing efficiency, high temperature conditions lead to poor safety

[0004] At present, the organic waste gas recovery process has been developed to a certain extent in China, but the engineering cases and process research inventions of organic waste gas recovery and treatment devices with large air volume and low concentration are still rare.

The invention patent No. 201010254498.6 proposes a recovery device and recovery method for large-volume and low-concentration organic waste gas, which effectively solves the problem of recycling this kind of organic waste gas to a certain extent, but the process it uses still has relatively low energy consumption. Disadvantages of high, limited efficiency, and limited application fields

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