The method of thermal deaeration of water

 

The invention relates to the field of power engineering and can be used in thermal power plants. The method of thermal deaeration of water for thermal stations of that network 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 the source and heated water. Maintain the desired concentration of carbon dioxide in deaerated make-up water is carried out by sequential regulation of the temperature of the source water and the temperature of the hot water. When the concentration of carbon dioxide relative to a given value of the first raise the temperature of the source water, and then, if necessary, increase the temperature of the hot water. At lower concentrations of carbon dioxide relative to a given value of the first lower the temperature of the hot water, and then the temperature of the source water. 1 Il.

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

Known equivalent ways deaerate the steam heating cogeneration turbine, make-up water heat before serving in the reverse pipeline network dearyou in vacuum deaerator, which in the deaerator serves original and overheated water (see and.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 deaeration of water for thermal power plants due to increased energy costs heating hot and the source water before the deaerator at a residual concentration of carbon dioxide in deaerated water below the required value. Usually thermal and hydraulic regimes preparation of makeup water constant support, according to the specified norms of the absence of carbon dioxide CO2in deaerated water in the estimated stationary mode. During operation of thermal power plants in several variables, modes of preparation of make-up water changes, water quality, together with the absence of CO2can be achieved at lower temperatures of the source and the hot water, but despite this, the temperature of the source and the hot water before deaerator remain unchanged, resulting in waste of energy. Another drawback, and the historic station.

The technical result achieved by the present invention is to improve the reliability and efficiency of thermal power plants by maintaining the optimum temperature of the source and the hot water supplied to the deaerator.

To achieve this result, a method of thermal deaeration of water for thermal stations of that network 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 the source and heated water.

The difference of the proposed method is that the maintenance of the desired concentration of carbon dioxide in deaerated make-up water is carried out by sequential regulation of the temperature of the source water and the temperature of the hot water, and when the concentration of carbon dioxide relative to a given value of the first raise the temperature of the source water, and then, if necessary, the temperature of the hot water and, conversely, by lowering the concentration of carbon dioxide relative to a given value of the first reduced water for thermal power stations can increase the reliability and efficiency of thermal power stations by providing the required quality deaeration at an economical work 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 source water pipeline 3 source water heater 7 with pipe heating medium 8 and the piping hot water 4 heater 9 that is connected to the steam pipeline of high potential 10. The station is equipped with a regulator carbon dioxide 11 in the make-up water heating system, which is connected to the sensor, the concentration of carbon dioxide 12 in deaerated make-up water and with regulatory bodies 13 on the pipeline of the heating medium heater source water and 14 on the steam pipeline of high potential hot water heater. As the sensor 12 may be them an example implementation of the claimed method of thermal deaeration of water.

Mains water is heated in the network heaters steam heating cogeneration turbine 1, feed water heating before serving in the reverse pipeline network 6 dearyou in vacuum deaerator 2, which in the deaerator serves the source and heated water. The source water is heated by steam the bottom of the heating process heater 7, and heated water - vapor sampling a higher capacity heater 9. Maintain the desired concentration of carbon dioxide in deaerated make-up water is carried out by sequential regulation of the temperature of the source water and the temperature of the hot water. When the concentration of carbon dioxide 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=40-50With, and then if necessary, increase the temperature of the hot water and, conversely, by lowering the concentration of carbon dioxide relative to a given value of the first lower the temperature of the hot water, and then the temperature of the source water. This regulation provides preferential loading high-efficiency nizhnesaksonskogo controller remikont R-130, to implement about 90 management programs regulated processes, moreover, has a number of features of self-regulated processes. Implementation with it under the stated manner consistent temperature control of the source water and the flow rate of the hot water (in this sequence and is the main distinctive feature of the claimed method) when used as a controlled factor residual content of carbon dioxide is not presented difficulties. Operations are blocking signals from the controller regulators are 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 temperature of the hot water.

Thus, the new method can improve the reliability and efficiency of thermal power stations by providing a given concentration of carbon dioxide in deaerated make-up water at an economical loading selections turbine.

Claims

The method of thermal deaeration of water on thermal power is operating turbine, make-up water heat 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 carbon dioxide in deaerated make-up water is carried out by sequential regulation of the temperature of the source water and the temperature of the hot water, and when the concentration of carbon dioxide relative to a given value of the first raise the temperature of the source water, and then if necessary, increase the temperature of the hot water and, conversely, when decreasing the concentration of carbon dioxide relative to a given value of the first lower the temperature of the hot water, and then 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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