Zeolite (molecular sieve) runner concentration technology is used in the treatment of flexible packaging VOCs waste

With the country’s increasingly strict environmental inspections and the introduction of national, provincial and municipal VOCs pollution discharge fees, the flexible packaging industry is increasingly paying attention to the treatment of VOCs, and various treatment technologies have gradually gained everyone’s recognition.
 
  In view of the actual situation of VOCs in flexible packaging companies with complex composition, large air volume, and large concentration range fluctuations, a more efficient treatment process-zeolite (molecular sieve) rotor adsorption concentration + catalytic combustion method is introduced, which can target the flexible packaging industry VOCs, to achieve continuous emission standards.
 
1. The structure and characteristics of zeolite
 
  Zeolite is the general name of zeolite group minerals, which is a water-containing alkali metal or alkaline earth metal aluminosilicate ore. There are 36 kinds of zeolites that have been discovered, and their common feature is that they have a framework structure, that is, in their crystals, the molecules are connected together like a scaffold, forming many cavities in the middle.
 
  Zeolite has the properties of adsorption, ion exchange, catalysis, acid and heat resistance, so it is widely used as adsorbents, ion exchangers and catalysts, and can also be used for gas drying, purification and sewage treatment.
 
1. The structure and characteristics of zeolite
 
  Zeolite is the general name of zeolite group minerals, which is a water-containing alkali metal or alkaline earth metal aluminosilicate ore. There are 36 kinds of zeolites that have been discovered, and their common feature is that they have a framework structure, that is, in their crystals, the molecules are connected together like a scaffold, forming many cavities in the middle.
 
  Zeolite has the properties of adsorption, ion exchange, catalysis, acid and heat resistance, so it is widely used as adsorbents, ion exchangers and catalysts, and can also be used for gas drying, purification and sewage treatment.
 
2. Working principle
 
  The working principle of the zeolite runner concentrated catalytic combustion method to treat organic waste gas is: the exhaust gas containing VOCs enters the zeolite runner. At this time, most of the VOCs in the exhaust gas are adsorbed by the zeolite on the runner, and the content of VOCs in the exhaust gas is greatly reduced. It becomes a relatively clean gas and is discharged into the atmosphere up to the standard. The exhaust gas that is adsorbed by the runner and then desorbed at a high temperature becomes a high-concentration VOCs gas, which can reduce the operating cost of subsequent processing procedures. The zeolite concentration rotor is used to concentrate the high-volume, low-concentration exhaust gas into low-volume, high-concentration exhaust gas, and then convert organic components into harmless CO2 and H2O by means of catalytic combustion to achieve the purpose of removing VOCs.
 
  The thermal combustion treatment process of zeolite runner is especially suitable for the treatment of large air volume and low concentration organic waste gas, which can effectively improve the treatment efficiency and reduce the operating cost. The VOCs removal efficiency can reach more than 90%, and some can even reach more than 99%.
 
  The purpose of zeolite rotor adsorption is to concentrate VOCs exhaust gas from a large air volume to a small air volume and a high concentration. In the case of small air volume, high-concentration VOCs gas will be processed by the burner more efficiently. The exhaust gas containing VOCs is collected when passing through the treatment zone of the rotating wheel. After the gas passes through the rotating wheel, the VOCs are adsorbed by the adsorption medium on the rotating wheel to be removed.
 
  When the runner turns to the desorption zone, the VOCs attached to the runner are desorbed from the opposite direction by the continuous high temperature and low flow desorption gas, and the highly concentrated VOCs are separated from the turntable and sent to the combustion furnace for combustion treatment . The rotating wheel passes through the desorption zone and then goes to the treatment zone again after low-temperature regeneration to adsorb and purify the VOCs exhaust gas.
 
  A small part of the purified VOCs waste gas enters the desorption zone by heating to regenerate the adsorption medium. Most of the purified gas enters the heat exchanger of the combustion furnace, is converted from low temperature gas to high temperature gas, and is transported to the workshop for equipment drying. The excess purified gas and the gas after combustion treatment are discharged through the exhaust cylinder.
 
  The purpose of the combustion furnace is to burn and oxidize the high-concentration VOCs gas desorbed by the runner, and at the same time use a heat exchanger to heat the gas purified by the runner.
 
3. Application of zeolite runner VOCs purification treatment soft packaging
 
  The VOCs discharged from the printing press, dry laminating machine, and coating machine are recycled to the zeolite runner VOCs purification treatment group. Under normal pressure, the strong adsorption capacity of zeolite for polar molecules and unsaturated molecules can be used for VOCs. The exhaust gas is adsorbed, and the treated high-temperature clean gas passes through the high-efficiency heat exchanger, and then sent to the gravure printing machine, laminating machine, coating machine, etc., to dry the product, replace various traditional electric heating methods, and realize gravure The control of VOCs emitted by machines and compound machines meets the standards.
 
  The zeolite runner VOCs purification processing unit adopts atmospheric pressure to output heat energy air with high safety performance. The total emissions of the volatile organic waste gas (the main components are ethanol, isopropanol, propanol, ethyl acetate, butyl acetate, butyl acetate, etc.) after the high-temperature treatment of the unit is lower than the concentration and concentration in national and local regulations. Rate of emission standards. The clean gas purified by the zeolite runner concentration system is recycled to the drying of printing presses and composite machines, saving drying costs for enterprises.