Why does the fully premixed condensing wall-hung boiler save gas?

The downstairs friend's explanation of total premixed condensation is very professional and easy to understand.

Let me add why the fully premixed condensing boiler saves fuel.

Complete premixing means that gas and air are mixed in a scientific proportion before entering the combustion chamber. Why should we mix them in proportion?

Because any fuel must consume oxygen in the air when burning, different fuels with the same volume (or mass) need different oxygen. The proportion of flue gas in the air is about 2 1%.

Total premixing is to dynamically adjust the intake of gas and air according to the amount of oxygen required for gas combustion, which ensures the full combustion of gas on the one hand and reduces the generation of flue gas on the other.

Full combustion is to fully release the chemical energy of fuel.

If too much air enters, nitrogen and other small proportion gases in the air that do not participate in combustion will be heated into high-temperature flue gas, and even if there is a condensation system, some heat will be taken away.

Therefore, the existence of total premixing can improve combustion efficiency, improve heat release and reduce heat loss from the above two aspects. After the heat utilization rate is improved, the temperature of the water flow in the wall-hung boiler is finally increased, so that the wall-hung boiler can raise the water temperature to the set temperature with less gas, thus saving gas.

Weber reverse heat exchange full premixed condensation wall-hung boiler core heat exchanger

Condensation is to recover the heat from the high-temperature flue gas produced by combustion through the condensation system and transfer this heat to the water system of the wall-hung boiler, which can not only raise the water temperature, but also reduce the exhaust temperature. When the temperature of flue gas reaches the dew point, the flue gas condenses into water droplets, releasing the latent heat of condensation and providing it to the water system of wall-hung boiler for use. Although this part of the heat is not much, the wall-hung boiler will run continuously for nearly 100 days in the heating season, and the accumulated heat is also very objective. In a real condensing wall-hung boiler, the flue gas temperature is less than 60, which reduces the contents of nitrogen oxides and CO in the flue gas and is more environmentally friendly.

Weibo wall-hung boiler

To sum up, the fully premixed condensation wall-hung boiler uses as much heat as possible to heat the system water, and reduces heat loss by improving heat release and heat absorption. After the heat utilization rate of the wall-hung boiler combustion system is improved, the output of fuel can be reduced, that is, the combustion power can be reduced, and the consumption of gas can be reduced to achieve the effect of saving gas.

Therefore, the fully premixed condensation wall-hung boiler also needs to have dynamic and intelligent power regulation, that is, frequency conversion function or intelligent load regulation function.