Technical characteristics and development direction of fully premixed wall-hung boilers

In recent years, due to favorable policies for natural gas and increasing public awareness of energy conservation and environmental protection, the wall-hung boiler market has entered a period of rapid development.
Condensing wall-hung boilers have stood out for their green advantages and have become the choice for many families' winter heating needs! Now, let's learn about the technical characteristics and future direction of fully premixed wall-hung boilers!
In the past atmospheric combustion, excessive air entered the furnace (=1.2~2), only absorbing heat, 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 thermal efficiency of the heat exchanger. In addition, compared with the existing atmospheric combustion, the air entering the furnace is greatly reduced.
The humidity of the remaining air flue gas is significantly reduced, and the condensation efficiency is significantly improved. The high thermal efficiency of air-burning condensing boilers is due to wind and intelligent control. The furnace uses fog control. The combustion power remains unchanged throughout the process. In the early stages of heating, rated power can be used for heating. The wind is controlled by wind and intelligent control. The furnace is controlled by fog. The combustion power remains unchanged throughout the process. In the early stages of heating, rated power can be used for heating.
After the water temperature reaches the set temperature, it automatically switches to low-power heat preservation to achieve constant temperature control. Through intelligent control, the change in combustion output adapts to the change in water temperature, thus eliminating gas waste. Gas elimination and atmospheric premixed combustion are also called premixed combustion, where gas is ejected from the nozzle under pressure, drawing in part of the air through the nozzle inlet until partially mixed.
Part of the mixed gas of primary air is ejected from the flame holes of the burner, introducing secondary air around the flame to form secondary combustion with the unburned gas.
The flame length of primary and secondary combustion is longer, and the flame temperature is lower. If the heat exchanger is not far (about 130mm), the flame contacting the heat exchanger will cause incomplete combustion.
Secondary air is generated by the negative pressure combustion of the replacement fan, resulting in low heat density. The heat exchanger is for heat exchange. Fifth, all preheating modes are poor. The combustion mode is stable. The combustion range is small. If the gas-air ratio is incorrect, it is difficult to ignite. Therefore, in order for the machine to operate safely and stably, all installation and adjustment personnel for premixed wall-hung boilers need professional installation and adjustment skills. Flashback in all premixed combustion will have serious consequences, especially for metal fiber burners.
The burner consists of a pressure reducing plate and an outer net. The roller burner has 3 pressure reducing plates and outer net plates. When flashback occurs at mm, the gap between the pressure reducing plate and the outer net plate will cause an explosion.
The metal fiber is close to the pressure reducing plate, and the mixed gas in the pressure reducing plate explodes due to flashback. Therefore, when adjusting the combustion state, please stay as far away from the flashback area as possible. The selection of the wall-hung boiler is the main component of the premixed wall-hung boiler. If the selection is incorrect, the entire machine will fail to operate. The heat exchanger of the condensing wall-hung boiler consists of a main heat exchanger and a condensing heat exchanger. The heat exchanger of the wall-hung boiler consists of a main heat exchanger and a condensing heat exchanger.
The best choice is to combine the two. This can reduce heat loss and save costs. For more information on the technical characteristics and development direction of fully premixed wall-hung boilers, please feel free to contact us!