1. Regenerative thermal oxidation incinerator (RTO)
(Regenerative Thermal Oxidizers)
The principle is to oxidize the organic matter (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 by the decomposition of the exhaust gas. The three-chamber RTO exhaust gas decomposition efficiency is more than 99%, and the heat recovery efficiency is more than 95%. The main structure of RTO consists of combustor, regenerator and switch valve.
The high-temperature gas generated by oxidation flows through the special ceramic heat accumulator, which heats the ceramic body and “stores heat”, which is used to preheat the subsequent organic waste gas. Thus saving waste gas heating fuel consumption. Ceramic regenerator should be divided into two (including two) or more, each regenerator successively through the process of heat storage – heat release – cleaning, etc., cycle, continuous work. The regenerator shall be immediately cleaned with an appropriate amount of clean air (to ensure the VOC removal rate above 98%) after the “heat release”, and the “heat storage” process can only be entered after the cleaning is completed. Otherwise, residual VOCS will be discharged into the chimney with the flue gas, thus reducing the treatment efficiency.
2. Regenerative catalyst incinerator RCO
(Regenerative Catalytic Oxidation)
Emissions from the process of VOCs into double groove RCO, three-way switch air valve exhaust gas import this RCO heat storage tank and preheating of the waste gas, waste gas containing pollution by regenerative ceramic block gradually entered the catalytic bed after heating, VOCs in the catalyst decomposition was oxidized and gives off heat in the heat storage tank of ceramic pieces, to reduce the consumption of the auxiliary fuel. The ceramic 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. Three – way switch air valve switch to change the RCO outlet/inlet temperature. If the VOCs concentration is high enough and the heat released is enough, the RCO needs no fuel. RCO heat recovery efficiency was 95%, for example, RCO export only relatively high inlet temperature 25 ℃.
3. Catalyst incinerator
The design of the catalyst incinerator depends on the exhaust air volume, VOCs concentration and the required removal efficiency. During operation, the exhaust gas fan with VOCs is introduced into the heat exchanger in the system. The exhaust gas is heated through the side of the heat exchanger tube and then through the burner. At this time, the exhaust gas has been heated to the catalytic decomposition temperature. After that, the heat enters the shell side of the heat exchanger through the purified gas to heat the untreated VOC exhaust gas on the tube side. This heat exchanger will reduce the energy consumption. Finally, the purified gas is discharged into the atmosphere from the chimney.
4. Direct combustion incinerator
(Direct Fired Thermal Oxidizer – DFTO)
The design of the direct combustion incinerator depends on the exhaust air volume, VOCs concentration and the required removal efficiency of the destruction. Waste gases containing VOCs used when operating system heat exchanger, fan import waste gas is heated by heat exchanger tube side, again through the burner, the gas has been heated to catalytic decomposition temperature (650 ~ 1000 ℃), and have enough indwelling time (0.5 ~ 2.0 seconds). Thermal reactions occur and VOCs are broken down into carbon dioxide and water vapour. After that, the heat enters the shell side of the heat exchanger through the purified gas to heat the untreated VOC exhaust gas at the side of the tube (tubeside). This heat exchanger will reduce the energy consumption (even when the concentration of certain appropriate VOCs is above, no additional fuel is needed). Finally, the purified gas is discharged into the atmosphere from the chimney.
5. Concentration wheel/incinerator
Concentrated runner/incinerator system adsorbs high air volume and low concentration volatile organic compounds (VOCs). Then the small air volume high concentration waste gas after defuxing is introduced into the incinerator for decomposition and purification. Big air volume low concentration of VOCs emissions, by a wheel for adsorption by zeolite materials, VOCs after by wheel adsorption of zeolite adsorption purification of gas through the chimney into the atmosphere, and then in the stripping zone with 180 ℃ ~ 200 ℃ hot air, small will be stripping VOCs. The desorption waste gas of such a high concentration and small air volume is decomposed into carbon dioxide and water gas in the incinerator, and the purified gas is discharged into the atmosphere through the chimney.