SU1574841A1 - Method of operation of multicylinder extraction turbine plant - Google Patents

Abstract

This invention relates to a power system. The method of operation of a turbo-installation on modes with maximum extraction of steam for heating, equipped with a multi-stage low pressure cylinder (LPC) with one or several tight swivel regulating diaphragms, includes the selection of steam for cooling the stages of a low-pressure cylinder, cooling it by injecting condensate in a special device and moving consistently through all stages LPCs to the most heated stages. The use of this invention improves the maneuverability of the turbine plant, its reliability and efficiency by Accelerating thermal capacity. 1 il.

Description

The invention relates to a power system and can be used in operation to improve the operating modes of heat-generating turbines with maximum steam extraction for heating, as well as in developing the design and thermal diagrams of new heat and power plants.

The aim of the invention is to increase the economy by increasing the heat output and reliability of the blade apparatus of the low pressure cylinder.

The drawing shows a schematic diagram of the heating plant.

The scheme contains cylinders 1-3 of high, medium to low pressure, an electric generator 4. From the cylinder 2 of medium pressure (DSC) steam is drawn to the heaters 5 and 6, through which the heating system’s network water is passed through line 7. In the cylinder 3 low pressure (LPD)

rotary regulating diaphragms 8 are located. The low-pressure cylinder 3 by the exhaust pipes 9 is connected to the condenser 10. Steam inlet 11 of the low-pressure cylinder 3 is connected to the transfer chambers 12, which can be used as steam extraction chambers (not shown), at the entrance to the intermediate stages 13 LPC 3 by means of pipe 14 for supplying cooling steam with a locking body 15 in it. A special device 16 is located in the pipe 14, into which the condensate is fed through the pipe 17 with a shut-off member 18 to reduce the temperature of the cooling steam from the steam inlet of the low-pressure cylinder 3.

The method is implemented as follows.

Before the transition of the cogeneration turbine unit of the short-circuit condensation mode to the cogeneration one with the maximum extraction of steam for heating, the shut-off body 15 is opened in the supply pipeline 14

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cooling steam taken from the steam inlet 11 of the low-pressure cylinder 3 to the transfer chambers 12 and further to the intermediate stages 13 of the low-pressure cylinder 3, which have blades over 550 mm long. Then, the rotary regulating diaphragms 8 in the steam inlet 11 of the low-pressure cylinder 3 are gradually closed until they are completely closed, stopping the successive supply of cooling steam through all the steps of the low-pressure cylinder 3 and de-fusing some of the steps of the low-pressure cylinder 3. Thus, they cool the last steps of the low-pressure cylinder 3 with working blades over 550 mm reduced cooling flow rate compared to that required to cool the flow-through jiofi part of the low-pressure cylinder 3 in the case of sequential passing of the cooling steam through all the low-pressure low-pressure stages. To ensure the reliability of the LPD 3 blade apparatus by reducing its erosion, the shut-off Organ 15 is opened on the cooling steam supply line 14 and the shut-off organ 18 on the pipeline 17 and using them, using their known flow characteristics, the ratio of condensate to steam in the cooling mixture is not more than 1: ten.

This ratio provides a reduction in the consumption of cooling steam. An additional amount of cooling steam is sent to the mains heater 5, which increases the heat output of the turbo unit.

During the reverse transition from the heat generation to the condensation mode from the center

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During the periods of maximum electric loads, first open the rotary control diaphragms 8, successively close the condensate supply using the valve 18, then supply the cooling steam using the valve 15 to the transfer chambers 12 and then to the intermediate stages 13 of the LPD 3.

Claims (2)

1. Method of operation of a multi-cylinder heat turbine installation on modes with maximum steam extraction for heat generation and closed rotary diaphragms by mixing condensate and cooling steam taken before the low-pressure steam cylinder into the intermediate stage of the latter, characterized in that, in order to improve the economy and reliability, apparatus by reducing the flow of cooling steam and preventing erosion of the blades, a saturated steam mixture is fed to the intermediate stage condensate from the core after concentration densatnogo condensate pump and lower part of the flow of steam in the heating selection ratio of 0.07 ... 0.09. 2. A method according to claim 1, characterized in that the mixture is fed to at least two intermediate stages of a low pressure cylinder. S