Devulcanizing wet-flue-gas hydrothermal medium type GGH (Gas-gas Heater) heating system

The invention discloses a devulcanizing wet-flue-gas hydrothermal medium type GGH (Gas-gas Heater) heating system. The system comprises a flue gas heat collector, an air heater, a working hot water circulating pump, a backup hot water circulating pump, a working pipeline, a backup pipeline and a bypass adjusting subline. According to the devulcanizing wet-flue-gas hydrothermal medium type GGH heating system, gathering high-temperature flue gas before being devulcanized and chimney protecting air for heat exchanging is saved, so that the design of a huge gas channel and a huge duct can be avoided; the minimum pipe wall temperature of the flue gas heat collector can be controlled to be above dew point temperature of the flue gas all the time, so that the low-temperature corrosion can be prevented, and the service life of equipment can be prolonged. 本发明公开了种脱硫湿烟气水热媒式GGH加热系统，包括烟气取热器、空气加热器、工作热水循环泵、备用热水循环泵、工作管道、备用管道和旁通调节副线。本发明的脱硫湿烟气水热媒式GGH加热系统，无需将脱硫前的高温烟气和烟囱保护空气拉到起进行换热，避免庞大烟道和风道设计，可以将烟气取热器的最低管壁温度始终控制在烟气的露点温度以上，防止低温腐