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Are fully premixed wall-hung boilers really efficient and energy-saving?
Release time:
2022/05/25 10:14
With rising living standards, people increasingly value comfortable home environments. Wall-hung boilers meet the needs of home heating and domestic hot water, and their two-in-one feature is very popular.
When choosing a wall-hung boiler, "energy efficiency" is an important consideration. So, let's find out if fully premixed wall-hung boilers are truly energy-efficient! Fully premixed wall-hung boilers mainly involve two technologies: fully premixed combustion technology and condensing technology. What is the difference between ordinary combustion and fully premixed wall-hung boiler combustion? Normal combustion In conventional combustion technology, the gas ratio valve opening is adjusted to adjust the load. In this case, the gas volume can be adjusted, but the air intake cannot be adjusted. Because the gas and air do not reach the completely mixed ratio for combustion, the thermal efficiency of this combustion technology is very low. Fully premixed wall-hung boiler combustion Fully premixed wall-hung boiler combustion is carried out after the air and gas are fully mixed. Fully premixed wall-hung boilers are characterized by fast combustion speed, high flame temperature, complete combustion, small excess air coefficient, and high thermal efficiency. Why are fully premixed wall-hung boilers energy-efficient? They use fully premixed combustion. The amount of air required for gas combustion is to make the combustion more complete; insufficient air will affect the completeness of the combustion. Fully premixed combustion is different from the combustion method of ordinary wall-hung boilers. Under different load conditions, the air-fuel ratio is always at the optimal state at the time of leaving the factory, ensuring complete combustion and no excess air, resulting in more complete and energy-efficient combustion. Smoke condensation. Fully premixed wall-hung boilers condense the water vapor in the flue gas by lowering the flue gas temperature, making full use of almost all the sensible heat and part of the latent heat of the water vapor, and having a good flue gas effect. However, the temperature of ordinary fireplaces is very high, so the latent heat in the water vapor cannot be utilized.
Meanwhile, the high flue gas temperature carries away sensible heat, reducing thermal efficiency, and fully premixed boilers are more energy-efficient than ordinary wall-hung boilers. Mature wall-hung technology is an adaptive system of oxygen sensors. However, oxygen sensors are prone to poisoning, resulting in a decrease in detection sensitivity after prolonged use.
Real-time detection and control of the gas valve opening to achieve closed-loop control. Continuous operation of the oxygen sensor greatly shortens the service life of the oxygen sensor.
When changing the detection sequence, a short-time smoke detection and adjustment are performed each time the boiler ignites, and then the smoke channel entering the oxygen sensor is closed. An appropriate detection value is set before the smoke exceeds the benchmark value, and the sensor smoke channel is closed to protect the oxygen sensor and avoid poisoning.
In addition, each time the boiler ignites, the system corrects the sensitivity of the oxygen sensor to lower the sensitivity curve and adjusts the detection accuracy according to the reduced parameters to prevent a decrease. This can significantly improve the service life of the oxygen sensor.
However, intermittent adjustment of the gas valve can only be used for this immediate use. Body adjustment is another adaptive thermal coupling detection of flame temperature.
With the gas volume unchanged, the air volume is changed. Each group has three air volume change values. The middle air volume value is the highest flame temperature detected by the thermocouple. The current electrical control valve opening is consistent with the current air volume. Excess air and air will lower the flame temperature. The fire introduction is that the fully premixed boiler is truly efficient and energy-saving. If you need to learn more, please Contact Us!
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