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Technical characteristics and development direction of full premix wall-hung boilers
Release time:
2022/05/25 10:15
In recent years, due to favorable policies for natural gas and people's increasing awareness of energy conservation and environmental protection, the wall-hung boiler market has entered a period of rapid development.
Condensing wall-hung boilers, with their green advantages, have become the choice for many families' winter heating needs! Now, let's understand the technical characteristics and 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 heat 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 in the flue gas is significantly reduced, significantly reducing the condensation efficiency. The thermal efficiency of air combustion condensing boilers is due to wind combustion and intelligence. The furnace uses fog control. The combustion power does not change during the whole process. In the early stage of heating, the rated power can be used for heating. The wind is controlled by wind and intelligence. The furnace is controlled by fog. The combustion power does not change during the whole process. In the early stage of heating, the 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 known as premixed combustion, where gas pressure is ejected from the nozzle, and part of the air is introduced through the nozzle inlet until partial mixing is achieved.
A part of the mixed gas of the primary air is ejected from the flame holes of the burner, introducing secondary air around the flame, forming secondary combustion with the unburned gas.
The flame length of the 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 replacement fan indoor negative pressure combustion heat density is small. 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 work safely and stably, all premixed wall-hung boiler installation and adjustment personnel need professional installation and adjustment skills. Backfire of all premixed combustion will have serious consequences, especially 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 backfire occurs at mm, the gap between the pressure reducing plate and the outer net plate will cause an explosion.
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 state, please stay away from the backfire area as much as possible. The selection of the wall-hung boiler is the main part of the mixed wall-hung boiler. If the selection is incorrect, the whole 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 option is to combine both. 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 Contact Us!
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