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Thermal Storage Incineration (RTO) is a device that burns and treats organic pollutants in waste gas, and uses thermal storage to exchange heat and raise the temperature of the waste gas itself. It is currently an effective measure for treating VOC waste gas.
Suitable exhaust gas conditions for RTO device incineration
In general, exhaust gases with a volatile organic compound concentration below 25% LEL (lower explosive limit of combustible gases) and a combustion adiabatic temperature rise above 40 ℃ are suitable for RTO device treatment.
Waste gases with VOCs concentration less than 2000mg/Nm3 and adiabatic combustion temperature rise below 40 ℃ require combustion assistance to increase their adiabatic temperature rise to above 40 ℃.
Process design of the main components of the system
The thermal storage incineration device consists of a thermal storage chamber, a combustion chamber, a directional valve, and a control system. The process design of its main component system includes: selection of the number of heat storage chamber beds, selection of heat storage material and type, calculation of heat storage volume, and determination of the inlet flow rate of the empty tower; The combustion temperature of the combustion chamber, the residence time of the flue gas, and the selection of the burner; Valve switching time; Selection and quantity calculation of insulation refractory materials; The matching of pre-processing measures and security measures.
Generally speaking, RTO automatic fresh air replenishment mainly involves the following processes:
(1) When the combustion chamber temperature remains above the set value, the fresh air damper will automatically increase the dilution air volume;
(2) When the air duct pressure is lower than the set value, the fresh air damper will automatically adjust to maintain the pressure inside the air duct within the set range;
(3) The oxygen content at the RTO outlet has been consistently lower than the set value, and the fresh air damper will automatically adjust to increase the oxygen content at the RTO outlet.
In addition, during the heating stage (0-750 ℃) of the RTO oxidation chamber, the bypass fan and valve are opened, the fresh air valve is opened, the intake valve is closed, and the combustion fan, atomization classification, and water circulation pump are turned on. When the temperature of the RTO oxidation chamber reaches 750 ℃ or above and there is a delay, the side ventilation fan, bypass valve, and fresh air valve will automatically close, and the main intake valve will automatically open to introduce exhaust gas for oxidation work. When the average temperature of the RTO oxidation chamber reaches 870 ℃ or above, the burner will shut down, and the bypass fan and valve will automatically open to allow the workshop exhaust gas to enter the emergency activated carbon adsorption device at the end; When the temperature in the oxidation chamber drops to 750 ℃, the burner automatically ignites.
The RTO intake pipeline is equipped with a combustible gas monitoring device to monitor the intake concentration in real time. During the intake phase of the system, the intake concentration should be strictly controlled between 5% LEL and 20% LEL. If the intake concentration is too high, the fresh air valve should be adjusted to manual mode and opened on the control panel. The exhaust gas concentration should be controlled within the above required range until the temperature of the heat storage chamber stabilizes at 820 ℃, and then the fresh air valve can be adjusted to automatic mode; If the organic gas concentration reaches 25% LEL or above, the RTO system will perform the following operations in sequence: close the main intake valve, open the fresh air valve, open the bypass fan and bypass valve, turn off the burner and enter the cooling stage. The exhaust gas will be treated by the activated carbon emergency adsorption device and discharged at a height of 25 meters to ensure the safe operation of the RTO system. (i.e. checking the concentration of exhaust gas intake. If the workshop emits a large amount of exhaust gas in a short period of time, resulting in an instantaneous high concentration of exhaust gas, it will cause a temperature alarm due to a rapid oxidation reaction in the incinerator. In this case, the fresh air valve should be opened in a timely manner to dilute the exhaust gas concentration.) As can be seen from the above, supplementing fresh air will actually affect the benchmark oxygen content value of RTO.
classic case
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