The method of operation of a thermal power station

 

The invention relates to the field of power engineering and can be used in thermal power plants. For implementing the method of operating thermal power station mains water is heated in the network heaters steam heating cogeneration turbine, feed water heating before serving in the reverse pipeline network dearyou in vacuum deaerator, which in the deaerator served source water and heated water. Maintain the desired concentration of dissolved oxygen in the deaerated makeup water is carried out by sequential adjustment of flow rate and temperature of heating agent, and when the concentration of dissolved oxygen relative to the specified value first increases the flow rate of the hot water, and then if necessary to increase the temperature of the heating agent and, conversely, by lowering the concentration of oxygen relative to a given value of the first lower the temperature of the heating agent, and then reduce the flow rate of the hot water. The invention improves the efficiency and reliability of thermal power plants. 1 Il.

The invention relates to the field teploenergeticheskii station, which mains water is heated in the network heaters steam heating cogeneration turbine, feed water heating before serving in the reverse pipeline network dearyou in vacuum deaerator, which in the deaerator served source water and heated water (see and.with. 1328563, B. I. No. 29, 1987). This analog adopted as a prototype.

The disadvantage of analogs and prototypes is reduced efficiency of the method of operation of thermal power plants due to the increased energy cost of supply and the heat of the heating agent in the deaerator at a residual concentration of oxygen in the deaerated water below the required value. Because regulatory quality deaeration of water, characterized primarily by dissolved oxygen in the deaerated water, can be achieved at much lower values of temperature and flow rate of a heating agent, deaeration almost always occurs with excessive temperature and flow rate of a heating agent. On the other hand, in some modes, the flow rate and temperature of heating agent may be insufficient to ensure regulatory quality deaeration, particularly for vacuum deaeration of water. So obrazmisli thermal power station.

The technical result achieved by the present invention is to improve the reliability and efficiency of thermal power plants by maintaining the optimal parameters of the flow and temperature of heating agent is supplied to the deaerator.

To achieve this result, a method of operating thermal power stations, which mains water is heated in the network heaters steam heating cogeneration turbine, feed water heating before serving in the reverse pipeline network dearyou in vacuum deaerator, which in the deaerator served source water and heated water.

The difference of the proposed method is that the maintenance of the desired concentration of dissolved oxygen in the deaerated makeup water is carried out by sequential adjustment of flow rate and temperature of heating agent, and when the concentration of dissolved oxygen relative to the specified value first increases the flow rate of the hot water, and then if necessary to increase the temperature of the heating agent and, conversely, by lowering the concentration of oxygen relative to a given value of the first lower temperature greasepole to improve the reliability and efficiency of thermal power stations by providing the required quality deaeration at an economical working of thermal power station.

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 thermal power station, explanatory way.

The station contains cogeneration turbine 1 with the selections of a pair connected by the heating medium to the heating selections, and turned on the heated environment in the network pipeline network heaters, vacuum deaerator 2 pipelines source 3 and the hot water 4 is connected by a pipeline deaerated makeup water 5 from the reverse pipeline network 6, is included in the piping hot water 4 heater 7 with pipe heating medium 8. The station is equipped with a regulator dissolved oxygen 9 in the make-up water heating system, which is connected to the sensor dissolved oxygen 10 in deaerated make-up water and with regulatory bodies 11 on the pipe of the hot water and 12 on the pipeline of the heating medium heater hot water.

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

Mains water is heated in the network heaters steam heating selections tip in vacuum deaerator 2, why in the deaerator served source water and heated water. The source water is heated by steam lower heating selection, and overheated water steam of selecting higher capacity heater 7. Maintain the desired concentration of dissolved oxygen in the deaerated makeup water is carried out by sequential adjustment of flow rate and temperature of heating agent. When the concentration of dissolved oxygen relative to the specified value first increases the flow rate of the hot water, and then if necessary to increase the temperature of the heating agent and, conversely, by lowering the concentration of oxygen relative to a given value of the first lower the temperature of the heating agent, and then reduce the flow rate of the hot water.

Thus, the new method can improve the reliability and efficiency of thermal power stations by providing a set concentration of dissolved oxygen in the deaerated makeup water at the optimal mode of operation of the turbine plant with a maximum production of electricity at thermal consumption.

Claims

The method of operation of a thermal power station, which is deliciou water heat before serving in the reverse pipeline network dearyou in vacuum deaerator, why in the deaerator served source water and the heating agent, characterized in that the maintenance of the desired concentration of dissolved oxygen in the deaerated makeup water is carried out by sequential adjustment of flow rate and temperature of heating agent, and when the concentration of dissolved oxygen relative to the specified value first increases the flow of a heating agent, and then if necessary to increase its temperature and, conversely, by lowering the concentration of oxygen relative to a given value of the first lower the temperature of the heating agent, and then reduce its consumption.

 

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FIELD: thermal engineering; thermal power stations.

SUBSTANCE: proposed operating process of thermal power station is as follows. Boiler-generated steam is conveyed to turbine wherefrom it is supplied to condenser for condensing it; full-flow condensate is delivered by means of condensate pump to low-pressure regenerative heaters and then to high-pressure deaerator; makeup water is deaerated in atmospheric-pressure deaerator and conveyed to full-flow condensate path, vented steam being discharged from atmospheric-pressure deaerator into atmosphere. Flowrate of vented steam discharged from atmospheric-pressure deaerator is regulated with respect to desired content of oxygen dissolved in mixed flow of makeup water and full-flow condensate beyond vacuum system of turbine unit, for instance downstream of low-pressure heater second along full-flow-condensate path.

EFFECT: enhanced economic efficiency and operating reliability of thermal power station.

1 cl, 1 dwg

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