Steam turbine steam exhaust device atomization control method and device

The invention provides a steam turbine steam exhaust device atomization control method. The method comprises the following steps that n spraying pipelines which are connected in parallel are arrangedat the tail end of a water supplementing pipeline, and the ith spraying pipeline is provided with Ni atomizing nozzles, wherein i is sequentially taken from 1 to n, n and Ni are integers greater than1, and the number of the atomizing nozzles arranged on the spraying pipelines is different; and the current water supplementing flow Q supplement is compared with the value of N1*Q single...Nn*Q single and the sum of at least any two of the values of N1*Q single...Nn*Q single, then the value which is closest to the current water supplementing flow Q supplement is selected out, and branch water supplementing electric doors at the front ends of the spraying pipeline or the spraying pipelines related to the closest value are opened, wherein Q single is the maximum flow of the single atomizing nozzle. Correspondingly, the