Experimentalstudy on performance ofintelligent phasechange recoverysystemforsulfur-containingfluegas waste heat

In order to master the operation characteristics of the intelligent phase change recovery system for sulfur-containing flue gas waste heat, a performance test bench was designed and built to test the influence of flue gas heat load ratio, LiBr solution mass concentration and circulating pump frequency on the operation characteristics of the system. The results show that the energy efficiency increases linearly as the flue gas heat load ratio rises. And the exergy efficiency decreases with the increase of flue gas heat load ratio, but the exergy efficiency is only about 0.15-0.20, indicating that the system is suitable for production and living heating rather than work. Meanwhile, LiBr solution mass concentration and circulating pump frequency have a little influence on the energy efficiency and exergy efficiency. In addition, the temperature difference of LiBr solution at inlet and outlet of the heat exchanger first increases, then tends to be flat, and increases again with the increase of flue gas load ratio. When the system operates at low heat load ratio condition with the 53% of LiBr solution mass concentration, the wall temperature of heat exchanger and the outlet temperature of flue gas are less affected by the flue gas heat load ratio. The above conclusions can provide a theoretical basis for the operation of intelligent phase change recovery system for sulfur-containing flue gas waste heat.