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Technical Characteristics and Development Trends of Fully Premixed Wall-Mounted Boilers

Release Date:

2022/05/25 10:15

In recent years, due to good material policies for natural gas and increasing public awareness of energy saving and environmental protection, the wall-hung boiler market has entered a period of rapid development.
Condensing wall-hung boilers stand out with their green advantages and have become the choice for many families' winter heating needs! Next, let's learn about the technical characteristics and development direction of full pre-mixed wall-hung boilers!
In past atmospheric combustion, excessive air entered the furnace room (=1.2~2), only absorbing heat and reducing thermal efficiency.
The water vapor in the flue gas condenses into condensate in the low-temperature section of the heat exchanger, releasing latent heat of vaporization and improving the heat exchanger's thermal efficiency. In addition, compared with existing atmospheric combustion, the amount of air entering the furnace room is greatly reduced.
The smoke humidity of the remaining air is significantly reduced, and the condensation efficiency is significantly reduced. The thermal efficiency of air-combustion condensing furnaces is due to wind combustion and intelligence. The furnace adopts mist control. The combustion power does not change throughout the entire process. In the early stages of heating, rated power can be used for heating. The wind is controlled by wind and intelligence. The furnace is controlled by mist. The combustion power does not change throughout the entire process. In the early stages of heating, rated power can be used for heating.
After the outlet water temperature reaches the set temperature, it automatically switches to low-power heat preservation to achieve constant temperature control. Through intelligent control, changes in combustion output adapt to changes in water temperature, thereby eliminating gas waste. Gas elimination and atmospheric pre-mixed combustion are also called pre-mixed combustion, where gas pressure is ejected from the nozzle, and part of the air enters through the nozzle inlet until partially mixed.
A portion of the primary air-mixed gas is ejected from the burner's flame holes, introducing secondary air around the flame to form secondary combustion with incompletely burned gases.
The flame length of primary and secondary combustion is longer, and the flame temperature is lower. If the heat exchanger is not far (around 130mm), contact between the flame and the heat exchanger will cause incomplete combustion.
Secondary air has low combustion heat density due to the negative pressure inside the replacement fan room. The heat exchanger performs heat exchange. Fifth, all preheating modes are poor. The combustion mode is stable. The combustion range is small. If the gas-to-air ratio is incorrect, it is difficult to ignite. Therefore, to ensure the safe and stable operation of the machine, installers and adjusters of all pre-mixed wall-hung boilers require professional installation and adjustment skills. Backfire in all pre-mixed combustion can lead to serious consequences, especially for metal fiber burners.
The burner consists of a pressure reducing plate and an outer mesh. For drum burners with 3 pressure reducing plates and outer mesh plates, when backfiring, the gap between the pressure reducing plate and the outer mesh plate will flash.
Metal fibers are close to the pressure reducing plate, and the mixed gas in the pressure reducing plate explodes due to backfire. Therefore, when adjusting the combustion status, please keep as far away from the backfire zone as possible. The choice of wall-hung boiler is for the main mixed wall-hung boiler components. If the choice is incorrect, the entire machine will fail to operate. The heat exchanger of a condensing wall-hung boiler consists of a main heat exchanger and a condensing heat exchanger. The heat exchanger of a wall-mounted furnace consists of a main heat exchanger and a condensing heat exchanger.
The best choice is to combine both. This can reduce heat loss and save costs. For more information on the technical characteristics and development direction of full pre-mixed wall-hung boilers, please feel free to contact us!

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