Method for measuring pH value of slurry in absorption tower for wet flue gas desulfurization

The invention provides a method for measuring the pH value of slurry in an absorption tower for wet flue gas desulfurization, which uses a measuring device. The device comprises an inlet pipeline, a sampling port switch valve, a pH meter measuring cylinder, outlet adjusting valves arranged at the downstream and the lower part of the pH meter measuring cylinder, and a pH meter mounting port, wherein the pH meter mounting port is arranged to be in an inclined state so as to enable a probe of the pH meter inserted into the pH meter mounting port to be inserted downwards in an inclined manner, and the angle between the axis of the pH meter mounting port and the horizontal plane is 15-65 degrees; The measuring device further comprises a flushing water pipe and a flushing water switch valve which are connected to an inlet pipeline at the downstream of the sampling opening switch valve, wherein the inner diameter or equivalent inner diameter of the pH meter measuring cylinder is more than two times of the inner diam