Method of operation of thermal power station

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.

1 dwg

 

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

Known equivalent ways of operating thermal power stations, in which steam from the turbine selection is removed for regenerative heaters low and high pressure, in which successively heated main condensate after the turbine condenser and feed water, the source of feed water is directed to water treatment installation of heating systems and dearyou in vacuum deaerator (see Sokolov DEATH, district Heating and heat networks: 5th ed., Rev.): Energoizdat, 1982. 3.1. p.53). This analog adopted as a prototype.

Disadvantages analogs and prototypes are reduced safety and efficiency due to the complexity of providing technologically necessary heating of the source water before treatment installation of heating systems to the required conditions of high quality vodopidgotovki temperature. Usually at power plants for heating the source of make-up water use pairs high-potential production selection.

The technical result achieved by the present invention is to increase the efficiency and reliability of thermal power plants due to the heated water source to the technologically required temperature high the cheap low-grade steam extraction turbine with minimal capital costs of the reconstruction scheme of the power plant, without installing special heater water source.

To achieve this result, a method of operating thermal power stations, through which steam from the turbine selection is removed for regenerative heaters low and high pressure, in which successively heated main condensate after the turbine condenser and feed water, the source of feed water is directed to water treatment installation of heating systems and dearyou in vacuum deaerator.

The peculiarity lies in the fact that at the bottom, closest to the condenser regenerative heater low pressure fuel source water before treatment installation of heating systems, and regenerative preheating of the main turbine condensate begin in the second from the turbine condenser of the low pressure heater.

A new way of operating thermal power station allows you to increase the efficiency and reliability of thermal power plants due to the use of low-grade selection to provide technologically necessary heating of the source of makeup water.

Next, consider the information, confirming the possibility of carrying out the invention with getting the required technical result.

The drawing shows a schematic diagram of a thermal electric mill is AI, explaining the proposed method. The station contains a steam boiler 1, a steam turbine with extraction steam 2, a capacitor 3 connected to the capacitor 3, the pipeline of the main condensate turbine 5 with the inclusion of a condensate pump 4, the regenerative heaters low pressure 6, 7, 8, 9, the lower and upper network heaters 10, 11, the pipeline of the source of makeup water 12 and water treatment installation 13 with a vacuum deaerator 14. Regenerative low pressure heater 6, is connected to the bottom, closest to the regenerative capacitor selection pair, turned on the heated environment in the pipeline of the source of makeup water 12 water treatment before you install 13 and excluded from the scheme of heating the main condensate. In the heating scheme of the main condensate is included only regenerative heaters low pressure 7, 8, 9.

Consider the example of implementing the inventive method of operating thermal power station.

Produced in the steam boiler 1 steam is directed into the turbine 2 and condense in the condenser 3, the main turbine condensate pump condensate pump 4 sequentially through regenerative heaters low pressure 7, 8, 9, and later in the deaerator high pressure, after which the deaerated water is fed a nutrient pump through regenerative heaters the high pressure steam boiler 1. Source water heating system is directed through the built-in beams of the capacitor 3 in the regenerative low pressure heater 6 and is heated to the required conditions of high quality vodopidgotovki temperature before submitting it to the water treatment installation 13 and the vacuum deaerator 14.

Thus, the proposed solution allows to increase the reliability of the plant by eliminating the low pressure heater 6, is connected to the bottom, closest to the regenerative capacitor selection a couple of circuits of the regenerative preheating of the primary condensate, and its inclusion in the scheme heat source water before treatment installation of the heating system. Use for heating water source low-grade pair of last regenerative turbine selection instead of the commonly used high-potential selection increases the efficiency of the power plant. The efficiency of the plant is also enhanced by increasing consumption of low-grade pair selection for heating the main condensate after the condenser 3 in the regenerative heater low pressure 7.

The method of operation of a thermal power station, through which steam from the turbine selection is removed for regenerative heaters low and high pressure, in which the sequence is correctly heated main condensate after the turbine condenser and feed water, the original feed water is directed to water treatment installation of heating systems and dearyou in vacuum deaerator, characterized in that at the bottom, closest to the condenser regenerative heater low pressure fuel source water before treatment installation of heating systems, and regenerative preheating of the main turbine condensate begin in the second from the turbine condenser of the low pressure heater.



 

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