An online
wet steam dryness gauge comprises a sampler, a
heat exchanger, a water tank, a
centrifuge, a cooler, a first sampling
branch, a second sampling
branch, a first cooling
branch, a second cooling branch and a third cooling branch. The sampler, the
heat exchanger, the water tank, the
centrifuge and the cooler are connected by the first sampling branch, the second sampling branch, the first cooling branch, the second cooling branch and the third cooling branch. The online
wet steam dryness gauge further comprises a first
enthalpy measuring device, a second
enthalpy measuring device, a first flow measuring device, a second flow measuring device and a
data processing module, wherein the first
enthalpy measuring device is used for measuring enthalpy at a medium outlet of the
heat exchanger, the second enthalpy measuring device is used for measuring enthalpy a cooling water inlet and a cooling water outlet, the first flow measuring device is mounted on the second sampling branch, the second flow measuring device is mounted on a second secondary branch, and the
data processing module is connected with the first enthalpy measuring device, the second enthalpy measuring device, the first flow measuring device and the second flow measuring device. By the gauge, pressure on a sampling side and a cooling side can be measured and calculated in real time, and real-time
wet steam dryness can be provided.