SU72912A1 - Steam turbine with adjustable extraction or steam supply - Google Patents

Description

The invention is directed to eliminating the reduction in efficiency. turbines with changes in the selection or supply pressure over a wide range. For this purpose, the selection or supply of steam is made from several outputs (inputs) with a special switching of one output (input) to another.

The drawing shows a diagram of the proposed steam turbine, in which the selection consists not of one, but of several, for example 2, 3, 4, 5, etc., exits for successively placed turbine steps. As the vapor pressure required by the consumer decreases, the selection switches automatically or manually from output 2 to outputs 3, 4, 5, etc., and as this pressure increases, similar switchings are made in the opposite direction. As a result of such switchings, the number of stages in the preceding stage increases or decreases, their selection of a part of the turbine and, accordingly, their number in the subsequent part decreases or, therefore, even with very significant changes in the pressure of the controlled selection, the efficiency the turbines do not decrease, since its stages always operate with stable, little deviating from the norm.

It is also proposed to be limited to only one regulating stage} and locate it in the part of the turbine next to the selection or supply of steam. In this case, the selection will be made not only from output 5, when the regulating stage, as usual, is immediately behind the selection site, but in some modes also from output 4, 3 or 2, i.e., in such unusual conditions, when the subsequent control stage is not in the beginning, but in the middle of the part of the turbine following the selection. Under these conditions, selection control will also be ensured.

In a turbine with several adjustable selections, it can be made switchable as all selections, and some of them, and moreover, any. All of the above applies to turbines with adjustable intermediate steam supply, each of which can be made switchable using the design scheme, analog No. 72912-2 -

gichnuyu above described. Along with the stepwise switching of the controlled selection (supply) from one output to another, the possibility of more subtle changes in its pressure within the limits of operation to each of the outputs is also not excluded by the usual permutation of the pressure regulator. Due to the fact that the pressures in the adjacent outlets differ slightly and their ratios are close to unity, with such permutations the efficiency of the turbine does not change much.

It is feasible to expand the boundaries of pressure change of a switchable adjustable selection (supply) of steam by switching it to adjacent adjustable outlets (inlets) or to the exhaust manifold, and the pressure in the latter can also be changed by interchanging the pressure regulator; by switching from one output to another.

Subject invention

Claims (2)

1. A steam turbine with an adjustable extraction or steam supply, characterized in that, in order to eliminate the reduction in efficiency. turbines with changes in the pressure of the selection or supply of steam over a wide range, the selection or supply of steam is made by several outputs (inputs) and switches from one output (input) to another in such a way that in any mode the selection or supply is connected to such an outlet (inlet), during operation of which the thermal gradients preceding the extraction or supply of steam and the next, their turbine stages remain close to the norm. 2. The turbine configuration form according to claim 1, characterized in that in the part of the turbine next to the steam extraction or supplying there is only one regulating stage located behind the last output (INPUT) of the switched selection or steam selection.