1. Combustion temperature conditioning burner temperature conditioning can be input through the keyboard of the text display, change the output frequency of the frequency converter, and regulate the appropriate air volume. When the air volume increases and the combustion temperature exceeds the set value, the PLC controls the inverter to reduce the output frequency and reduce the air volume to stabilize the temperature of the burner.
If the output frequency of the frequency converter is lower than the set value (the frequency of the fan output air is set to 5Hz), and the output air volume is still higher than the set value, the PLC starts timing. If it drops to the set value within the time, the PLC discards the timing and continues to operate with frequency conversion and speed regulation.
If the temperature is still higher than the set value within the time, PLC will continue to adjust until the set value is reached. The frequency output of frequency converter is controlled by PLC after PID calculation; if the temperature is not good, the frequency will rise and the delay will persist. vice versa.
2. The setting of fuel air ratio has been indicated in the literature that the range of "gas / air ratio" during catalytic combustion is generally between 4% and 11%; under combustion conditions, when the fuel / air ratio is 6%, better catalytic combustion can be achieved, and the combustion system can achieve thermal efficiency and better emission effect.
The gas air ratio of the system is regulated by zero pressure valve. When the air volume of the fan is changed, the fuel / air ratio can also be changed to meet the requirements of catalytic burner combustion. In the start-up, as long as the frequency of the output converter is adjusted, the fuel / air ratio change from flaming combustion to catalytic combustion can be achieved.
Catalytic RCO combustion equipment
3. Combustion starting process: when the control system is on standby, it will enter the combustion operation state after receiving the input starting command. First, the control system will conduct self-test, then purge, and the inverter will output signal to control the rotation of the fan.
The air volume gradually changes from low speed to high speed and then gradually to low speed. Fresh air is blown through the combustion furnace plate to ensure that there is no residual gas in the furnace and the combustion process is stable. The detailed operation is to start the inverter first.
PLC Analog output signal makes the frequency of the frequency converter rise from the start set frequency, and then drop after reaching the frequency, so as to finish the purging before starting. After that, the combustion signal is announced and the high-pressure burner operates. At the same time, the valve of the combustion pipe is opened and the small fire is ignited.
Through the detection of ultraviolet sensor, after the small fire is ignited, open the main gas valve. At this time, the catalytic combustion furnace plate carries out flame combustion until the detection temperature signal reaches the set combustion closing temperature, the combustion valve is closed, the combustion process is completed, and the catalytic combustion conditioning stage is entered.
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