RU2269010C2 - Method of operation of thermal power station - Google Patents

Abstract

FIELD: heat power engineering.

SUBSTANCE: according to proposed method, steam from turbine extractions is fed to regenerative high and low pressure heaters in which main condensate, after turbine condenser, and feed water are heated successively, and primary makeup water is delivered to heat supply system makeup water preparation plant and is deaerated in vacuum deaerator. Primary water is heated in lower low-pressure regenerative heater nearest to condenser before heat supply system makeup water preparation plant, and regenerative heating of main condensate of turbine is started in low-pressure heater, second from turbine condenser.

EFFECT: increased economy and improved reliability of thermal power station owing to heating of primary water to technologically required temperatures by highly economic low-potential extraction of turbine steam at minimum capital layouts for reconstruction of circuit of thermal power station without fitting special primary water heater.

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Description

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

Analogs are known - the methods of operating a thermal power plant, in which steam from the turbine offsets is taken to regenerative heaters of low and high pressure, in which the main condensate after the turbine condenser and feed water are sequentially heated, the feed water is sent to a water treatment plant for heating system recharge and deaerated in a vacuum deaerator (see Sokolov E.Ya. Heating and heating networks: 5th ed., revised. - M.: Energoizdat, 1982. Fig. 3.1. p. 53). This analogue is adopted as a prototype.

The disadvantages of the analogues and the prototype are reduced reliability and efficiency due to the difficulty of providing technologically necessary heating of the source water before the water treatment plant to recharge the heating system to the temperature necessary for high-quality water treatment. Typically, in power plants, high potential production steam is used to heat the feed water.

The technical result achieved by the present invention is to increase the efficiency and reliability of a thermal power plant by heating the source water to a technologically necessary temperature with a highly economical low-potential steam extraction of the turbine with minimal capital costs for reconstruction of the power plant circuit, without installing a special source water heater.

To achieve this result, a method of operating a thermal power plant is proposed, in which steam from the turbine offsets is taken to regenerative heaters of low and high pressure, in which the main condensate after the turbine condenser and feed water are sequentially heated, the initial make-up water is sent to a water treatment plant for heating network recharge and deaerated in a vacuum deaerator.

The peculiarity lies in the fact that in the lower regenerative low-pressure heater closest to the condenser, the source water is heated before the water treatment plant for feeding the heating network, and the regenerative heating of the main condensate of the turbine begins in the second low-pressure heater from the turbine condenser.

A new way of operating a thermal power plant allows you to increase the cost-effectiveness and reliability of a thermal power plant by using low-potential selection to provide technologically necessary heating of the feed water.

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 with steam extraction 2, a condenser 3 connected to the condenser 3, the pipeline of the main condensate of the turbine 5 with a condensate pump 4 included in it, regenerative low-pressure heaters 6, 7, 8, 9, lower and upper network heaters 10, 11, the feed water supply pipe 12 and the water treatment plant 13 with a vacuum deaerator 14. The regenerative low-pressure heater 6 connected to the lower regenerative steam extraction closest to the condenser is switched on by heating the medium to be fed into the feed water pipe 12 before the water treatment plant 13 and is excluded from the main condensate heating circuit. Only regenerative low pressure heaters 7, 8, 9 are included in the main condensate heating circuit.

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 3, the main condensate of the turbine is pumped by the condensate pump 4 sequentially through regenerative low-pressure heaters 7, 8, 9 and then to the high pressure deaerator, after which the deaerated water is supplied by the feed pump through the regenerative high-pressure heaters to the steam boiler 1. The feed water of the heating system feeds through the built-in bundles of the condenser 3 to the regenerative low-pressure heater 6 and grevayut to the required conditions for quality vodoprigotovleniya temperature before it is supplied to the water treatment plant 13 and the vacuum deaerator 14.

Thus, the proposed solution improves the reliability of the power plant by eliminating the low-pressure heater 6 connected to the lower regenerative steam selection closest to the condenser from the regenerative heating circuit of the main condensate and including it in the source water heating circuit before the water treatment installation of the heating system. The use of the low-grade steam of the last regenerative selection of the turbine to replace the commonly used high-potential samples for heating the source water increases the efficiency of the power plant. The efficiency of the power plant also increases by increasing the consumption of low-grade steam selection for heating the main condensate after the condenser 3 in the regenerative low-pressure heater 7.

Claims (1)

The method of operation of a thermal power plant, in which the steam from the turbine offsets is directed to regenerative heaters of low and high pressure, in which the main condensate after the turbine condenser and feed water are sequentially heated, the feed water is sent to a water treatment plant for heating network supply and deaerated in a vacuum deaerator, characterized by the fact that in the lower regenerative low pressure heater closest to the condenser, the source water is heated before the water treatment Drains heating system installation, and regenerative heating of main condensate in a second turbine start capacitor from low pressure turbine preheater.