MOISTURE SEPARATION HEATER

A moisture separator/heater that removes moisture from highly moist steam and heats the steam from which the moisture has been removed to produce superheated steam is provided. The moisture separator/heater includes a cylindrical main shell, a moisture separator that removes moisture in steam to be heated that flows in through the bottom of the main shell, and a heater disposed above the moisture separator in the main shell. A plurality of restricting members are disposed in a heating space in the moisture separator/ heater so as to sandwich a tube bundle side plate with an outer rail to restrict rounded-back deformation thereof and are disposed so as to satisfy an expression of 0.2‰¤L1/L and L2/L‰¤0.4, where L represents the total length of a straight tube portion, L1 represents the distance from one of the pad members that is closest to a steam heating header to an end of the straight tube portion on the side where the steam heating header is present, and L2 represents the distance from one of the pad members that is closest to a curved tube portion to an end of the straight tube portion on the side where the curved tube portion is present. The thus configured moisture separator/ heater allows a leak path between an inner rail and the outer rail can be made sufficiently narrow irrespective of the length of a heat-transfer tube.