1. Regenerative thermal oxidation incinerator RTO
(Regenerative Thermal Oxidizers)
The principle is to oxidize the organic compounds (VOCs) in the exhaust gas into corresponding carbon dioxide and water at high temperature, so as to purify the exhaust gas and recover the heat released during the decomposition of the exhaust gas. The three-chamber RTO exhaust gas decomposition efficiency reaches more than 99%, and the heat recovery efficiency reaches above 95. The main structure of RTO consists of combustion chamber, regenerator and switching valve.
The high-temperature gas generated by oxidation flows through the special ceramic regenerator, which makes the ceramic body warm up and “restores heat”, which is used to preheat the organic waste gas that enters subsequently. This saves fuel consumption for exhaust gas warming. The ceramic regenerator should be divided into two (including two) or more, and each regenerator undergoes procedures such as heat storage, heat release, cleaning, etc. in turn, and it works continuously. After the regenerator “releases heat”, an appropriate amount of clean air should be introduced to clean the regenerator (to ensure that the VOC removal rate is above 98%), and the “heat storage” procedure can only be entered after the cleaning is completed. Otherwise, the residual VOCS is discharged to the chimney with the flue gas, thereby reducing the treatment efficiency.
2. Regenerative catalyst incinerator RCO
(Regenerative Catalytic Oxidation)
The exhaust gas containing VOCs discharged from the process enters the double-tank RCO, and the three-way switching air valve guides the exhaust gas into the heat storage tank of the RCO to preheat the exhaust gas. The polluted exhaust gas is gradually heated by the heat storage ceramic block and then enters the catalytic bed. VOCs After being decomposed by the catalyst and oxidized, the ceramic block releases heat energy in the second heat storage tank to reduce the consumption of auxiliary fuel. The pottery block is heated, and the clean gas after combustion and oxidation gradually reduces the temperature, so the outlet temperature is slightly higher than the RCO inlet temperature. The three-way switching damper switches to change the RCO outlet/inlet temperature. If the concentration of VOCs is high enough and the heat energy released is sufficient, RCO does not require fuel. For example, when the RCO heat recovery efficiency is 95%, the RCO outlet temperature is only 25°C higher than the inlet temperature.
3. Catalyst incinerator
The design of the catalyst incinerator is determined according to the exhaust air volume, VOCs concentration and the desired destruction removal efficiency. During operation, the exhaust gas containing VOCs is introduced into the heat exchanger in the system by the system fan. After the exhaust gas is heated through the tube side of the heat exchanger, it passes through the burner. At this time, the exhaust gas has been heated to the catalytic decomposition temperature, and then passes through the catalyst bed. Catalytic decomposition releases heat, and VOCs are decomposed into carbon dioxide and water vapor. After that, the hot and purified gas enters the shell side of the heat exchanger to heat the untreated VOC waste gas on the tube side. This heat exchanger will reduce energy consumption. Finally, the purified gas is discharged from the chimney to the atmosphere.
4. Direct combustion incinerator
(Direct Fired Thermal Oxidizer-DFTO)
The design of the direct-fired incinerator is determined by the exhaust air volume, the concentration of VOCs and the required damage removal efficiency. During operation, the exhaust gas containing VOCs is introduced into the heat exchanger in the system by the system fan. After the exhaust gas is heated through the tube side of the heat exchanger, it passes through the burner. At this time, the exhaust gas has been heated to the catalytic decomposition temperature (650~1000℃) , and have sufficient indwelling time (0.5~2.0 seconds). At this time, a thermal reaction occurs, and the VOCs are decomposed into carbon dioxide and water vapor. Then this hot and purified gas enters the shell side of the heat exchanger to heat the untreated VOC waste gas on the tube side. This heat exchanger will reduce energy consumption (even when the concentration of VOCs is above a certain appropriate level. requires additional fuel), and finally, the purified gas is discharged from the stack to the atmosphere.
5. Concentration runner / incinerator
The concentrator rotor/incinerator system adsorbs volatile organic compounds (VOCs) with high air volume and low concentration. After desorption, the small air volume and high concentration waste gas is introduced into the incinerator to be decomposed and purified. The VOCs waste gas with large air volume and low concentration passes through a runner with zeolite as the adsorption material. The VOCs are adsorbed by the zeolite in the runner adsorption zone and the purified gas is discharged to the atmosphere through the chimney, and then in the desorption zone at 180℃~ A small amount of hot air at 200°C desorbs VOCs. Such a high-concentration and small-air volume desorption waste gas is decomposed into carbon dioxide and water gas in the incinerator, and the purified gas is discharged to the atmosphere through the chimney.
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