Gas boiler heat loss types and solutions

Heat loss refers to the difference between the total heat released by the fuel in a gas boiler and the heat used by the boiler. This wasted heat is primarily due to high-temperature flue gas emissions, heat dissipation by the furnace itself, incomplete combustion of the fuel, and physical heat loss from ash.

Waste heat loss: The exhaust temperature of an industrial boiler is approximately 200-300°C. The higher the exhaust gas temperature, the more heat is released by the flue gas, and the greater the heat loss. Reducing the exhaust gas temperature by 15-20°C can reduce exhaust heat loss by approximately 1%. Installing a condensation recovery device near the flue duct condenses and releases heat as the high-temperature flue gas passes through, which is then recycled back into the boiler. This can significantly reduce the exhaust temperature of a gas boiler and significantly improve thermal efficiency.

Incomplete fuel combustion: A furnace that is too small, too low, or with an inadequate fuel-to-air ratio can result in incomplete combustion of the fuel, which enters the low-temperature flue duct, leading to heat loss. Advanced premixed combustion technology can be used to precisely match the fuel and air before the fuel enters the combustion chamber for more complete combustion, thus avoiding heat loss caused by incomplete combustion.

Heat loss from the furnace: The temperature of the furnace wall and the gas boiler body is always higher than the ambient air temperature. This temperature difference results in heat loss. Heat loss is related to the boiler's surface area, insulation level, external air temperature, and airflow velocity. Generally, the furnace wall surface temperature should not exceed 50°C to effectively reduce heat loss.

Heat loss from ash: Some solid fuels produce ash after combustion, which often retains some heat, resulting in heat loss. Currently, there is no effective method for recovering this waste heat.