With the strengthening of environmental policies and the elimination of coal-fired boilers, many users will purchase new environmentally friendly boiler products. Natural gas boilers follow the trend and emerge as the times require. They are well received by the market, so many users choose to buy them. But after buying it, there will be some minor problems. Today, let’s take adjusting the intake size of the burner as an example to share how to adjust the intake size of the burner for a natural gas boiler.
How to adjust the intake air size of the burner for natural gas boilers:
the
① Remove the overpressure switch and explosion-proof pin on the explosion-proof port, take out the medium temperature sensor, and take out the overtemperature switch.
the
②Set the vacuum target on the display to 25Kpa, and the vacuum switch to 20Kpa.
③ Put the flue gas cut-off valve on the chimney in the open state, and put the gas ball valve in the open state.
④ Exhaust the air through the release pipe on the gas pipe, and close the release valve until the smell of gas is smelled.
⑤ Install the portable pressure gauge on the pressure measuring point at the inlet end of the valve group.
⑥ Adjust the gas pressure switch and air pressure switch to a small scale, turn on the burner and observe the gas butterfly valve (the gas butterfly valve should be rotated to 90° when the burner is pre-blowing on high fire, and the gas butterfly valve is generally at 25°-30° when pre-blowing on low fire. °). If not, the burner should be stopped first, and then realized by adjusting the servo motor.
⑦Turn the pressure adjustment screw on the valve group to the wide opening, turn on the burner for ignition. It is possible that the ignition will be unsuccessful at the first two times, because the gas may be impure or the damper is too large, and the gas volume is small.
⑧After the ignition is successful, keep the burner burning at a low fire, and check the flow rate and adjust the flow rate (generally, the flow rate at a low fire is about 1/3 of the gas consumption per hour of full load). After adjusting the flow rate of the small fire, switch to the high fire for combustion, and check and adjust the flow (the flow rate of the high fire is the full-load hourly gas consumption of the unit)
⑨ After the flow rate is adjusted, turn the burner to low fire and high fire respectively, and adjust the size of the damper according to the measured value on the oxygen content instrument (generally, the oxygen content of flue gas after low fire combustion is 5%, and after high fire combustion The oxygen content of flue gas is about 3%), adjust the damper to the ideal position.
⑩Let the burner run at the low fire position, turn the air pressure switch clockwise until the burner is locked, then turn the dial 20% counterclockwise, turn it on again and ensure that it works normally. If it still locks, please turn the dial counterclockwise a little more until it works normally.
Let the burner run on high fire, turn the gas pressure switch clockwise until the burner stops, then turn the gas pressure switch 2mbar counterclockwise, turn on the burner again, if it still stops, continue to turn the gas pressure switch counterclockwise Rotate 1mbar.
Based on the analysis of how to adjust the intake air of the burner for the above-mentioned natural gas boiler, it can be known that the gas pressure gauge should be observed at any time during the commissioning process. If the pressure does not meet the requirements or the fluctuation is too large, the unit may not be able to burn normally.
With the strengthening of environmental policies and the elimination of coal-fired boilers, many users will purchase new environmentally friendly boiler products. Natural gas boilers follow the trend and emerge as the times require. They are well received by the market, so many users choose to buy them. But after buying it, there will be some minor problems. Today, let’s take adjusting the intake size of the burner as an example to share how to adjust the intake size of the burner for a natural gas boiler.
How to adjust the intake air size of the burner for natural gas boilers:
the
① Remove the overpressure switch and explosion-proof pin on the explosion-proof port, take out the medium temperature sensor, and take out the overtemperature switch.
the
②Set the vacuum target on the display to 25Kpa, and the vacuum switch to 20Kpa.
③ Put the flue gas cut-off valve on the chimney in the open state, and put the gas ball valve in the open state.
④ Exhaust the air through the release pipe on the gas pipe, and close the release valve until the smell of gas is smelled.
⑤ Install the portable pressure gauge on the pressure measuring point at the inlet end of the valve group.
⑥ Adjust the gas pressure switch and air pressure switch to a small scale, turn on the burner and observe the gas butterfly valve (the gas butterfly valve should be rotated to 90° when the burner is pre-blowing on high fire, and the gas butterfly valve is generally at 25°-30° when pre-blowing on low fire. °). If not, the burner should be stopped first, and then realized by adjusting the servo motor.
⑦Turn the pressure adjustment screw on the valve group to the wide opening, turn on the burner for ignition. It is possible that the ignition will be unsuccessful at the first two times, because the gas may be impure or the damper is too large, and the gas volume is small.
⑧After the ignition is successful, keep the burner burning at a low fire, and check the flow rate and adjust the flow rate (generally, the flow rate at a low fire is about 1/3 of the gas consumption per hour of full load). After adjusting the flow rate of the small fire, switch to the high fire for combustion, and check and adjust the flow (the flow rate of the high fire is the full-load hourly gas consumption of the unit)
⑨ After the flow rate is adjusted, turn the burner to low fire and high fire respectively, and adjust the size of the damper according to the measured value on the oxygen content instrument (generally, the oxygen content of flue gas after low fire combustion is 5%, and after high fire combustion The oxygen content of flue gas is about 3%), adjust the damper to the ideal position.
⑩Let the burner run at the low fire position, turn the air pressure switch clockwise until the burner is locked, then turn the dial 20% counterclockwise, turn it on again and ensure that it works normally. If it still locks, please turn the dial counterclockwise a little more until it works normally.
Let the burner run on high fire, turn the gas pressure switch clockwise until the burner stops, then turn the gas pressure switch 2mbar counterclockwise, turn on the burner again, if it still stops, continue to turn the gas pressure switch counterclockwise Rotate 1mbar.
Based on the analysis of how to adjust the intake air of the burner for the above-mentioned natural gas boiler, it can be known that the gas pressure gauge should be observed at any time during the commissioning process. If the pressure does not meet the requirements or the fluctuation is too large, the unit may not be able to burn normally.