Steam dryness determining method and device

The embodiment of the invention discloses a steam dryness determining method and device. The method comprises the steps that a first range and a second range are determined; parameters are read, and a heat resistance value and a heat loss maximum value in the radial direction in the first range are determined; according to the heat loss maximum value and first preset space distance, a second position and first unit heat loss are determined; according to the first unit heat loss, first heat loss and second heat loss are determined; first steam dryness and second steam dryness are determined; according to the first steam dryness and the second steam dryness at all positions in the first range, the steam dryness of a first oil layer steam outlet is determined; a third heat loss value at a shaft third position in the second range is determined; according to the third position and second preset space distance, fourth heat loss and fourth steam dryness are determined; and the steam dryness at a second oil layer steam outlet is determined. According to the steam dryness determining method and device, the steam dryness at the steam outlets can be determined.