Survey: Temperature drop of flue gas from regenerator outlet to flue gas heater inlet (after butterfly valve)

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The temperature drop of flue gas from the regenerator outlet to the flue gas fan inlet (behind the butterfly valve) is an important parameter reflecting the efficiency of flue gas energy recovery in the system. A large temperature drop indicates significant heat loss of the flue gas in the flue, which generally leads to a reduced efficiency in flue gas energy recovery. At present, there are significant differences in the temperature drop of flue gas from the outlet of the regenerator in various domestic units to the inlet of the flue gas turbine (after the butterfly valve), and there are many factors that influence this drop. Factors such as the length of the flue duct, whether water or steam is sprayed, the thickness of the insulation material, the quality of that insulation, and the type of regeneration all affect the magnitude of this temperature difference. Below are the temperature difference data from some Sinopec catalytic units as recorded in a survey conducted in 2003; we welcome everyone to provide the actual data from their own units, along with information such as the type of regeneration used. Incomplete regeneration of the regenerator, flue gas reburning process; complete regeneration of the regenerator. Temperature drop in °C: Yanshan 3# – 44, Qilu 2# – 22, Shijiazhuang – 31, Gaoqiao 2# – 21, Jinan 2# – 26, Yangzi – 30, Gaoqiao 1# – 36, Tianjin – 22, Shengli Petrochemical – 45, Yuehua – 28, Luoyang 1# – 29, Changling – 50, Luoyang 2# – 25, Cangzhou – 26, Gaoqiao 3# – 13, Yanshan 2# – 32, Guangzhou 1# – 23