| 摘要 |
PURPOSE:To make the efficiency of a back pressure turbine system come close to a maximum value by a method wherein in the case of a group of turbines of the same type, a calculating operation is made so as to find out a point of correspondence of the operating point of each of the turbines to an operating point on a valve loop of the turbine on the bases of the valve loop and the present operation condition of the turbine. CONSTITUTION:A plurality of turbines 2a,..., 2d have their exhaust pipes connected in common to a basi pipe 11 so that the turbines are controlled to have a constant steam pressure. That is, each of the turbines is brought under such a valve loop operation condition that the total output of the turbines becomes maximum without changing the total flow rate of steam flowing through the turbines. For this purpose, the point of correspondence of the operating point of each of the turbines to the operating point on the valve loop of the turbine stored in a memory 6 is ascertained on the base of the actual flow rate of steam through the turbine. Thus, in operating the distribution of steam for the turbines, the inclinations deltaW/deltaQ of the valve loop at the operating points of the turbines are compared to one another and the flow rate of steam in the turbine having a larger valve loop inclination is increased while that in the turbine having a smaller valve loop inclination is decreased. Therefore, it is possible to make the efficiency of the back pressure turbine system maximum by repeating the above operation. |
