The approximate process flow of catalytic combustion equipment
Release time:
2023-04-14 09:17
1. Preheating: Preheating is the basic process form of catalytic combustion. The exhaust gas temperature is below 100 ℃ and the concentration is also low, so heat cannot be self-sufficient. Therefore, before entering the reactor, it needs to be heated in the preheating chamber. After combustion and purification, the gas exchanges heat with the untreated exhaust gas in the heat exchanger to recover some of the heat. This process usually uses gas or electric heating to raise the temperature to the ignition temperature required for the catalytic reaction.
2. Self heat balance type: When the exhaust gas is discharged at a high temperature (around 300 ℃), higher than the ignition temperature, and with a high content of substances, the heat exchanger recovers the heat generated by the purified gas, which can maintain heat balance under normal operation without the need for additional heat. Usually, only an electric heater is required in the catalytic combustion reactor for ignition.
3. Adsorption catalytic combustion: When the flow rate, concentration, and temperature of the exhaust gas are high, low, and catalytic combustion requires a large amount of fuel, adsorption can be used to adsorb the exhaust gas onto an adsorbent for concentration, and then hot air blowing can be used to desorb the exhaust gas into concentrated waste gas (which can be concentrated by more than 10 times), and then catalytic combustion can be carried out. At this point, there is no need to supplement the heat source to maintain normal operation.
4. The selection of catalytic combustion process for exhaust gas mainly depends on the heat release during the combustion process, i.e. the type and concentration of combustibles in the exhaust gas; The ignition temperature, i.e. the properties of the components and catalyst activity; Heat recovery rate, etc. When the recovered heat exceeds the required heat for preheating, it can achieve its own thermal balance operation without the need for external heat sources, which is economical.
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