The installing dimensions of gas-gas heater (GGH)rotors in desulphurization systems of thermal power plants are exacting.

火力发电厂环保脱硫系统中烟气加热器（G GH）扇形仓转子的安装尺寸精度要求非常严格。

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Before entering the existing stack the flue gas has to be reheated to protect the stack against condensates. For reheating the gas gas Heater (GGH) is used.

因此在进入烟囱之前，必须被再度加热而使烟囱不结露，因此烟气换热器就被运用了。

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