Adsorption catalytic combustion, low concentration of organic waste gas flow, low temperature, the use of catalytic combustion requires a lot of fuel consumption, can be adsorbed on the adsorbent concentration of organic waste gas, and then through hot air purification, organic waste gas stripping high concentration of organic waste gas (can concentrate more than 10 times), and then catalytic combustion. At this point, you don't need to add a heat source to keep it running.
Preheating is the basic flow form of RCO catalytic combustion. The temperature of organic waste gas is lower than 100 ℃, the concentration is low, and the heat is not self-sufficient. Therefore, the reactor chamber is preheated before entering the reactor to increase its temperature. After combustion and purification, the gas is exchanged with the untreated waste gas in the heat exchanger to recover part of the heat. This process is usually heated by gas or electricity to the ignition temperature required for the catalytic reaction.
When the temperature of the organic waste gas is higher than the ignition temperature (about 300 ℃) and the content of organic matter is high, part of the recovered purified gas of the heat exchanger can be kept in heat balance, and no additional heat is needed during normal operation. An electric heater is usually installed in the catalytic reactor to ignite.
Natural gas is generally used as auxiliary fuel for catalytic combustion, and fuel oil and electric heating can also be used as auxiliary fuel. Generally, purified gas is used for combustion supporting. If the purified gas cannot be used as combustion supporting gas, air should be introduced to assist combustion.
The combustion chamber must have enough length and space to make the air flow and temperature distribution uniform through the catalyst surface and ensure that the flame does not directly contact the catalyst surface. Catalytic combustion device should have good heat preservation effect. The furnace body is usually lined with refractory material with steel structure shell or double wall structure.
Since catalytic combustion is an irreversible exothermic reaction, it should be carried out at the highest possible temperature no matter what stage of the reaction is, so as to obtain a higher conversion rate. However, the operating temperature is often limited by some conditions, such as the heat-resistant temperature of the catalyst, the acquisition of high-temperature materials, the supply of heat energy, and whether there are side reactions. Therefore, it should be selected according to the actual situation in actual production.
The catalytic combustion device is easy to clean and replace. Generally, the catalyst reactor should be designed as a mold tray structure with convenient loading and unloading, so as to clean and replace the catalyst carrier. These aspects should be considered in the design of catalytic combustion device.
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