<P> The purpose of a reheating cycle is to remove the moisture carried by the steam at the final stages of the expansion process . In this variation , two turbines work in series . The first accepts vapor from the boiler at high pressure . After the vapor has passed through the first turbine , it re-enters the boiler and is reheated before passing through a second , lower - pressure , turbine . The reheat temperatures are very close or equal to the inlet temperatures , whereas the optimum reheat pressure needed is only one fourth of the original boiler pressure . Among other advantages , this prevents the vapor from condensing during its expansion and thereby damaging the turbine blades , and improves the efficiency of the cycle , because more of the heat flow into the cycle occurs at higher temperature . The reheat cycle was first introduced in the 1920s , but was not operational for long due to technical difficulties . In the 1940s , it was reintroduced with the increasing manufacture of high - pressure boilers , and eventually double reheating was introduced in the 1950s . The idea behind double reheating is to increase the average temperature . It was observed that more than two stages of reheating are unnecessary , since the next stage increases the cycle efficiency only half as much as the preceding stage . Today , double reheating is commonly used in power plants that operate under supercritical pressure . </P>
advantage of using reheat cycle in steam power plant
prevents the vapor from condensing during its expansion and thereby damaging the turbine blades , and improves the efficiency of the cycle , because more of the heat flow into the cycle occurs at higher temperature