Efficient energy-saving purifying system for industrial volatile organic pollutants

Abstract

The invention relates to an efficient energy-saving purifying system for industrial volatile organic pollutants. The system is characterized in that (1) an adsorbent bed is provided with an active carbon clapboard of a hollow structure, wherein the active carbon clapboard is communicated with side walls of a hollow structure, and the two side walls of a hollow structure are provided with a hot air inlet and a hot air outlet respectively; and (2) a catalytic combustion bed is connected with a plate type heat exchanger, wherein the plate type heat exchanger is connected with the hot air inlets of the side walls of a hollow structure of the adsorbent bed through an adsorbent bed heating fan. The system provided by the invention is of a simple and reasonable structure, and ensures that the energy consumption can be effectively reduced, the purifying rate is improved, the service life of a catalyst is prolonged, the desorption time is shortened, the purifying efficiency is improved, and the operation cost is lowered, thereby being a safe and reliable efficient energy-saving purifying system for industrial volatile organic pollutants.

Description

technical field [0001] The invention belongs to the field of organic pollutant purification systems, in particular to a high-efficiency energy-saving purification system for industrial volatile organic pollutants. Background technique [0002] In the prior art, the purification system composed of the adsorption system and the desorption catalytic combustion system is used to realize the treatment of industrial volatile organic pollutants with large air volume and low concentration. Its main structure includes filters, flame arresters, adsorption beds, Adsorption main fan and desorption electric heater, catalytic combustion bed, mixed flow heat exchanger and desorption circulation fan in the desorption catalytic combustion system. The filter, flame arrester, adsorption bed and adsorption main fan in the adsorption system are connected sequentially through pipelines to realize the adsorption of industrial volatile organic pollutants with large air volume and low concentration....

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Problems solved by technology

Although this existing system can realize the processing of large air volume and low concentration industrial volatile organic pollutants, it has the following problems: 1. Because the air after the desorption electric heater is heated enters the adsorption bed, it will affect the adsorbent and adsorbate. And the metal structure of the adsorption bed is heated at the same time, so that the metal structure of the adsorption bed consumes part of the heat energy, thus prolonging the desorption time and reducing the desorption efficiency, especially in winter in the north, the loss of heat energy is greater, and the desorption time is longer. , if the waste heat generated by catalytic combustion is not fully utilized, it will also aggravate the heat pollution of the atmospheric environment; Reduce the oxygen partial pressure of the mixed gas, reduce the active oxygen participating in the catalytic reaction, and reduce the catalyst activity, thus affecting the continuous stability and completeness of the catalytic oxidation reaction, reducing the purification rate and increasing the energy consumption of electric heating; 3. The purification rate of the catalytic combustion bed is low, and the service life of the catalyst is short. The reason is that industrial volatile organic pollutants enter the catalytic combustion bed in the prior art from below and are discharged from the top. The catalytic bed produces heating effect, so the upper area of ​​the overall catalytic bed is easy to exceed its allowable working temperature due to the accumulation of heat energy, causing the catalyst to lose its activity, resulting in a reduction in the purification rate and a shortened service life of the catalyst; in addition, the catalytic combustion process of industrial volatile organic pollutants is natural The direction of convection is from bottom to top. When passing through the catalytic combustion bed, the exhaust gas begins to rise rapidly, resulting in a decrease in the contact time between the exhaust gas and the catalytic combustion bed, resulting in a decrease in the purification rate.

In summary, the above three reasons lead to high energy consumption, low purification rate, shortened service life of the catalyst, long desorption process time, low purification efficiency and high operating cost in the purification system of the entire prior art

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