RU2275509C1 - Method of operation of thermal power station - Google Patents

Abstract

FIELD: heat power engineering.

SUBSTANCE: proposed invention increases economy and improves reliability of thermal power station owing to stable and high economy heating of heat-carrying agent before vacuum deaerator of make-up water of heating system to technologically required temperature at minimum capital outlays for reconstruction of thermal power station. To obtain this result, when operating thermal power station, steam from three steam extractions of extraction turbine is directed to high pressure regenerative heaters, and from last four extractions, to low-pressure regenerative heaters in which main condensate after turbine condenser and feed water are successively heated. Steam from seventh and sixth turbine extractions is directed for heating system water, respectively, in lower and upper heating system heaters. Influent water and heat-carrying agent are directed into vacuum deaerator of make-up water of heating system, make-up water or heating system water being used as heat-carrying agent. Water used as heat-carrying agent of vacuum deaerator of make-up water of heating system is heated by steam of fifth extraction of turbine before delivery into vacuum deaerator.

EFFECT: improved economy and reliability of thermal power station.

1 dwg

Description

The invention relates to the field of power engineering and can be used in thermal power plants.

Analogs are known - methods of operating a thermal power plant, in which steam from the first three samples of a cogeneration turbine is diverted to high pressure regenerative heaters, and of the last four to low pressure regenerative heaters, in which the main condensate after the turbine condenser and feed water are sequentially heated, from the seventh and sixth selections of the turbine divert steam to heat the network water, respectively, in the lower and upper network heaters, in the vacuum deaerator of makeup water t heating networks direct source water and a heating agent - network water after the upper network heater (see Ryzhkin V.Ya. Thermal power plants. M .: Energy. 1976. Fig. 14-4 and description to it on page 210). This analogue is adopted as a prototype.

The disadvantages of the analogues and the prototype are the reduced reliability and efficiency of thermal power plants due to the insufficient temperature of the heating agent under the conditions for ensuring effective deaeration of make-up water of the heating system, especially in the warm season, at low temperatures of the mains water after the top network heater.

The technical result achieved by the present invention is to increase the efficiency and reliability of a thermal power plant due to the stable and highly economical heating of the heating agent in front of the vacuum deaerator of the heating system’s make-up water to the technologically necessary temperature with minimal capital expenditures for the reconstruction of the power plant circuit.

To achieve this result, a method is proposed for operating a thermal power plant, in which steam from the first three selections of a cogeneration turbine is diverted to high pressure regenerative heaters, and of the last four to low pressure regenerative heaters, in which the main condensate after the turbine condenser and feed water are sequentially heated , from the seventh and sixth selections of the turbine steam is diverted to heat the network water, respectively, in the lower and upper network heaters, in a vacuum deae The heating water feed water distributor is supplied with feed water and a heating agent, which is used as makeup or mains water.

The peculiarity lies in the fact that the water used as the heating agent of the vacuum deaerator of the heating water make-up water is heated with the fifth turbine fifth steam before being fed to the vacuum deaerator.

A new way of operating a thermal power plant allows to increase the cost-effectiveness and reliability of a thermal power plant due to the stable heating of a heating agent of a vacuum deaerator of heating water to a technologically necessary temperature with low-potential extraction of turbine steam with minimal capital costs for reconstruction of the power plant circuit.

Next, we consider the information confirming the possibility of carrying out the invention with obtaining the desired technical result.

The drawing shows a schematic diagram of a thermal power plant, explaining the proposed method. The station contains a steam boiler 1, a steam turbine 2 with seven steam take-offs 3-9, a condenser 10 connected to the condenser 10, the main condensate pipe of the turbine 11 with a condensate pump 12 included in it, regenerative low-pressure heaters 13, lower and upper network heaters 14 and 15, included in the network pipe 16 and connected to the seventh 9 and sixth 8 of the turbine take-off, a steam-water heat exchanger 17, connected via a heated medium into the pipeline of the heating agent 18 of the vacuum deaerator of makeup water of the heating network 19 and Turning to the fifth conduit 20, extraction steam 7.

Consider an example of the implementation of the claimed method of operation of a thermal power plant.

The steam generated in the steam boiler 1 is sent to the turbine 2 and condensed in the condenser 10, the main condensate of the turbine is pumped by the condensate pump 12 sequentially through the low pressure regenerative heaters 13 and then to the high pressure deaerator, after which the deaerated water is supplied by the feed pump through the high pressure regenerative heaters to steam boiler 1. Loss of network water from the pipelines of the heating network is compensated by make-up water. The heating agent 18 for the vacuum deaerator of the make-up water of the heating network 19 is sent to the steam-water heat exchanger 17 and is heated by the fifth selection steam 7 to the temperature necessary to ensure effective deaeration.

Thus, the use of a steam-water heat exchanger 17, connected by a pipe 20 to the fifth selection of steam 7, allows providing technologically necessary heating of the heating agent throughout the year, thereby improving the reliability and efficiency of the power plant. The station’s efficiency is also increased by increasing the generation of electricity from heat consumption due to the additional consumption of low-grade steam from the fifth turbine selection.

Claims (1)

The method of operation of a thermal power plant, in which steam from the first three selections of a cogeneration turbine is diverted to high pressure regenerative heaters, and of the last four to low pressure regenerative heaters, in which the main condensate after the turbine condenser and feed water are sequentially heated from the seventh and sixth of turbine withdrawals, steam is diverted to heat the network water, respectively, in the lower and upper network heaters, into the vacuum deaerator of makeup water of the heating network m heating the raw water and an agent which is used as make-up water or a network, characterized in that the water used as a heating agent vacuum deaerator feed water heating system, prior to feeding preheated steam turbine of the fifth selection in the vacuum deaerator.