SU1337530A1 - Method of controlling turbine steam consumption and device for effecting same - Google Patents

Abstract

Invention m. used in ship installations and allows to increase the efficiency on partial load modes. The blades (L) 2, 3 are interconnected through one into two groups, which are associated with the main and auxiliary drives. The rotation of L 2 is performed through one, increasing or decreasing the installation angle, and the rotation of the remaining L 3 before contacting their output edges 21 with the backs of 17 L 2. This implementation allows to ensure, starting from 80-85% of the load, any given mode of operation turbine unit and reduce losses from the mismatch of the geometry of the nozzle apparatus to the flow regime. 2 sec. f-ly, 9 ill. And askh at 2 20 g5 3 19 17 2 23 with 00 pr sf with figl

Description

The invention relates to turbine construction and can be used in steam turbines of ship and stationary power plants.

The aim of the invention is to improve the economy on partial load conditions.

FIG. 1 shows a radial-axial stage double-flow steam turbine; in fig. 2 is a drive for rotating one blade group (view A in FIG. 1); in fig. 3 is a drive for rotating another group of blades (view B in FIG. 1); in fig. 4 — initial grid of nozzle profiles corresponding to nominal steam consumption; in fig. 5 shows the relative positions of the profiles in the nozzle array, corresponding to 85% of the nominal steam consumption; in fig. 6 - the same, for 50 ° / o nominal steam consumption; in fig. 7 - the same, for 25 ° / o nominal steam consumption; in fig. 8 shows the relative position of the profiles in the grating of the nozzle apparatus, at which the steam supply to the turbine is stopped; in fig. 9 shows the dependence of the change in the relative flow rate (G) of steam on the change in the angle (D at Uy, Ru) of the installation of the nozzle vanes relative to their initial position using the example of the radial-axial stage of the icebreaker turbine unit L. Brezhnev.

A device for controlling the steam flow of a turbine contains a radial nozzle apparatus 1 with rotary nozzle vanes 2, 3. The vanes 2 are connected to a rotary ring 4 on which the pin 5 is rigidly attached, which enters the groove 6 of the lever 7, and the latter is rigidly fixed on axis 8 turning the nozzle vanes 2. The rotary ring 4 has a support 9. The bearing 10 refers to the rotary ring 11 on which the pin 12, which enters the groove 13 of the lever 14, is fixed, and the latter is rigidly fixed on the axis 5 of the rotation of the nozzle vanes 3. The nozzle vanes 2 have output edge 16, back (in Convex surface 17 and a concave surface 18. Blades 2 and 3 form interscapular channels 19 and 20. Blades 3 have an exit edge 21, a back 22 and a concave surface 23. Nozzle vanes 2 and 3 are joined together through one into groups 24 and 25, which are associated respectively with primary and secondary drives, which include supports 9 and 10, swivel rings 4 and 11, pins 5 and 12, levers 7 and 14.

When switching to the partial load mode, moving the rotary ring 4 (in the direction indicated in FIG. 2), through the levers 7, the nozzle vanes 2 are rotated with an increase in angle j of the setting by a predetermined value. Simultaneously moving the rotary ring 11 (in direction.

indicated in FIG. 3) through the levers 14, the nozzle vanes 3 are rotated prior to the contact (contact) of their output edges 21 with the backs 17

adjacent blades 2. In this case, the interscapular channels 20 formed by the backs 17 of the nozzle vanes 2 and the concave surface 23 of the nozzle vanes 3 are blocked, and the interscapular channels 19 acquire a supersonic form (Fig. 5). A further reduction in the flow rate up to the termination of the steam supply to the turbine is carried out as follows. Moving the rotary ring 4 (in the direction indicated in Fig. 2) through

5, the levers 7 rotate the nozzle vanes 2 with decreasing the angle Py of the installation. At the same time, by moving the rotary ring 11 (in the direction indicated in Fig. 3) through the levers 14, the nozzle vanes 3 are rotated at such an angle that their output edges 21 are in constant contact with the backs of the 17 nozzle vanes 2 and the inter-blade channels 20 overlapped (Fig. 6, 7). Steam entry to the turbine

5 stops when the exit edges 16 of the nozzle vanes 2 contact the backs of the 22 nozzle blades 3, and the interscapular ducts 19 are also blocked (Fig. 8).

0 Modes of more than 80-85% of the load are provided by the simultaneous rotation of all the blades 2, 3 of the nozzle apparatus 1. Thus, it is possible to control the increase or decrease of the load over the entire range of possible modes of the turbine operation without jumps.

To any given mode of operation from the specified range, you can go directly from the nominal, intermediate intermediate mine. This is necessary

0 by moving the rotary ring 4 (Fig. 2) in one direction or another (reducing or increasing the angle Ru) through the levers 7, turn the nozzle vanes 2 by a predetermined angle p, and the nozzle blades 3 through the levers 14 by moving the rotary ring 11 (in the direction indicated in Fig. 3) turn before contact (contact) of their output edges 21 with the backs 17 of the nozzle vanes 2 (Figs. 5, 6, 7).

0 Turning the nozzle vanes 2 through one, starting from the first, at a given angle of Py and changing the angle p, for the installation of the remaining length 3, until their output edges 21 touch the backs of the first 17, it ensures that starting from 80-85% of the load5, the specified mode of operation of the turbine unit (see Fig. 9) and reduce the losses due to the mismatch of the geometry of the nozzle unit 1 to the flow regime.

five

Claims (2)

1. A method of controlling the steam flow rate of a turbine by changing the angle of installation of the nozzle vanes by rotating them one relative to another and relative to their initial position, characterized in that, in order to improve efficiency on partial load conditions, the blades are rotated through one, increasing or decreasing the angle of installation and turn the remaining blades before contacting their output edges with the backs of the first. 2. A device for controlling the steam flow rate of a turbine, containing a radial nozzle apparatus with rotary nozzle vanes and the main drive for their rotation, characterized in that it is equipped with an additional drive, and the blades are combined through one into groups, one of which is connected with the main one, and other - with additional drives. 7 ff 75 J L 73  Js 17 f8 :%  2122. is 19 4 1 / ucx 5  2Z 20 ucx 17  15 gz 3 22 sixteen Z3 20 22 -W -5 ° Editor M. Bandura Order 4107/29 VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 05 rO ° fiye.9 L Compiled by V. Gutorov Tehred I. VeresKorrektor M. Demchik Circulation 481 Subscription