Catalytic combustion equipment

Catalytic combustion equipment refers to a device or equipment that burns under the action of a catalyst. The working principle of the catalytic combustion equipment is: with the help of a catalyst, the organic waste gas undergoes flameless combustion at a lower ignition temperature, so that the organic waste gas is decomposed into carbon dioxide and water vapor. The electrical control system of catalytic combustion equipment consists of PLC controller, text display, frequency converter, igniter, ultraviolet sensor, thermocouple and other electrical control equipment, as well as a fan. In addition, a zero-pressure valve regulates the ratio of gas to air.

Combustibles burn under the action of catalysts. Compared with direct combustion, catalytic combustion has lower combustion temperature. The catalysts used in catalytic combustion are multi-component substances of noble metals and metal oxides with large specific surface areas. For example, household catalytic gas stoves loaded with Pd or rare earth compounds can reduce the CO content in the exhaust gas and improve thermal efficiency. The alumina catalyst loaded with 0.2% pt can burn most organic compounds at 500°C and deodorize and purify it to a chemical shift σ=1 or less. Catalytic combustion is flameless combustion, so it is suitable for occasions with high performance requirements, such as fuel cells using H2 and O2 as raw materials, and stoves using gasoline or alcohol as raw materials (the catalyst is Pt-impregnated asbestos), etc. For example, to eliminate NOx smoke in chemical plants, fuel can be added to the smoke, and NOx can be converted into N2 gas through catalytic combustion through supported platinum and palladium catalysts. Using an appropriate catalyst, a combustion method is used to decompose and oxidize the combustible substances in the gas at a lower temperature.

The electrical control system of catalytic combustion equipment consists of PLC controller, text display, frequency converter, igniter, ultraviolet sensor, thermocouple and other electrical control equipment, as well as a fan. In addition, a zero-pressure valve regulates the ratio of gas to air. The working process of the catalytic combustion electrical control system is divided into three states: burner working state, stop state and parameter setting state. In the working state, it is divided into ignition process and combustion process. The temperature is detected by the installed thermocouple and sent to the text display for display. The PLC has analog input and output modules that detect flame combustion signals and thermocouple temperature signals. After comparing the detected signals with the set signals, it controls the output frequency of the inverter through 0 to 10 V electrical signals to adjust the fan speed and maintain the combustion temperature of the burner. This constitutes a control system based on the set temperature. It automatically detects the burner temperature signal and compares it with the set temperature, outputs various alarm signals or directly shuts down the machine. The display can show gas flow, combustion temperature and inverter output frequency. Information such as setting parameters and working status; the operating temperature parameters can be adjusted online through the display, and the set temperature can be modified to control the operation of the fan. The system is also equipped with a variety of protection functions, especially a strong logical interlock function, so that the system works and has relatively complete control functions.

Characteristics of catalytic combustion equipment:

1. Suitable for treating high-temperature, continuous organic waste gas

2. No secondary pollution is produced, and equipment investment and operating costs are low;

3. Catalytic low-temperature decomposition, short preheating time, low energy consumption, long service life of the catalyst, and catalytic decomposition up to above;

4. The equipment operates stably, has few moving parts, has a well-equipped maintenance system, and is easy to operate and maintain;

5. Fully automated PLC control is realized during the entire operation process, which is convenient;

6. The system has complete facilities, equipped with flame arresters and explosion vents. If any abnormal conditions occur during operation, the system will alarm and automatically shut down.