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. In the method of operation of a thermal power station, at 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. For this tank serves the source and heated water. Maintain the desired concentration of dissolved oxygen in the deaerated makeup water is carried out by sequential regulation of the temperature of the source water and the flow rate of the hot water. When the concentration of dissolved oxygen relative to a given value of the first raise the temperature of the source water, and then, if necessary, increase the flow rate of the hot water. With decreasing oxygen concentration relative to a given value of the first reduce the consumption of the hot water, and then reduce the temperature of the source water. The invention improves the reliability and efficiency of thermal power station. 1 Il.

The invention relates to the field of power engineering and can be esportatori mains water is heated in the network heaters steam heating cogeneration turbine, make-up water heat before serving in the reverse pipeline network dearyou in vacuum deaerator, which in the deaerator served source water and heated water.with. SU 1328563, F 01 17/02, 07.08.1987). 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 of a heating agent may be insufficient to ensure regulatory quality deaeration, particularly for vacuum deaeration of water. Thus, another disadvantage of this method is the low quality of deaeration of water, leading to lower reliability thermal nadezhnosti and efficiency of thermal power plants by maintaining the optimum temperature of the source water and the flow rate of a heating agent, 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 regulation of the temperature of the source water and the flow rate of the hot water, and when the concentration of dissolved oxygen relative to a given value of the first raise the temperature of the source water, and then, if necessary, increase the flow rate of the hot water and, conversely, by lowering the concentration of oxygen relative to a given value of the first reduce the consumption of the hot water, and then reduce the temperature of the source water.

A new way of operating thermal power stations can increase the reliability and efficiency of thermal power stations by ensuring that the required quality is 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 source water pipeline 3 source water heater 7 that is connected to the piping of a 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, with regulatory bodies 11 on the pipeline of the heating medium heater source water and 12 on the piping 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 cogeneration turbine 1, feed water heating before serving in the reverse pipeline network 6 beaurocrat ferry bottom of the heating process heater 7, and overheated water steam extraction the higher potential. Maintain the desired concentration of dissolved oxygen in the deaerated makeup water is carried out by sequential regulation of the temperature of the source water and the flow rate of the hot water. When the concentration of dissolved oxygen relative to a given value of the first raise the temperature of the source water within the heat output of heater water source or to a temperature of t=40-50C, and then if necessary, increase the flow rate of the hot water and, conversely, by lowering the concentration of oxygen relative to a given value of the first reduce the consumption of the hot water, and then reduce the temperature of the source water. This regulation provides preferential loading high-efficiency lower heating turbine selection.

When implementing the invention (claimed solution has successfully passed an industrial control) as a regulator applied commercially available microprocessor controller remikont R-130 to implement about 90 management programs regulated processes, moreover, has a number of features of self-regulated processes. Implementation with its Pomona hot water (in this sequence and is the main distinctive feature of the claimed method) when used as a leading factor of the residual oxygen content is not presented difficulties. The operation to block the signals from the controller to the regulators is implemented by Ramakanta on the basis of the input in the sequence of operation of the regulatory authorities and are valid for a particular plant spacing changes the temperature of the source water and 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 an economical loading selections turbine.

Claims

The method of operation of a thermal power station, at 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 serves original and overheated water, characterized in that the maintenance of the desired concentration of dissolved oxygen in the deaerated makeup water is carried out by sequential regulation of the temperature of the source water and the flow rate of the hot water, and when you raise the end of then if necessary, increase the flow rate of the hot water and, conversely, with decreasing oxygen concentration relative to a given value of the first reduce the consumption of the hot water, and then reduce the temperature of the source water.

 

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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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