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Solution for deep recovery of flue gas waste heat

In natural gas boiler heating and gas-fired power generation systems, the high return water temperature of the heating network limits the reduction of flue gas temperature. As a result, the energy utilization efficiency of natural gas remains low, heating costs are high, and visible white smoke often appears in the exhaust, negatively impacting the urban landscape. Since the flue gas contains a large amount of water vapor with significant latent heat of vaporization, recovering and utilizing this heat can significantly improve the overall energy efficiency of natural gas and reduce heating costs.

Technical Advantages

Flue gas temperature from gas boilers can be reduced to below 30°C.

Improves natural gas utilization efficiency by more than 10%.

Reduces emissions of pollutants such as NOx and SO₂ in the flue gas, and eliminates visible white smoke.

The unit can also provide cooling in summer, offering dual functionality.

Application Description

After natural gas is combusted in the gas boiler, the resulting flue gas enters the flue gas deep heat recovery unit. This system deeply recovers the heat from the flue gas, significantly reducing the exhaust temperature. The recovered heat is then used to heat the return water of the heating network or directly for heat supply.

Case Study

Beijing Jingneng Future Gas Thermal Power Co., Ltd. adopts a gas-steam combined cycle for power generation while also providing heating to the surrounding areas. Huayuan Taimeng implemented a deep heat recovery system for the flue gas from the gas turbine, achieving a total heat recovery of 48 MW and a total heat supply capacity of 112 MW. This project marks the world’s first application of deep flue gas heat recovery technology in a gas-fired power plant.