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 flow rate 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 flow rate of the hot water. At lower concentrations of carbon dioxide 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 moretechnical stations (TES), 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. 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 on heating water source and supply of heating agent to 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 is changing the quality of the source water, and with it the lack of CO2can be achieved at a lower temperature of the source water and the costs of heating agent, but nesmaidit waste of energy. On the other hand, in some modes, the temperature of the source water and the flow rate of the 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 of thermal power plants.

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 water and the flow rate of a heating agent is 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 in the 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 flow rate of the hot water and, conversely, by lowering the concentration of carbon dioxide 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 method of deaeration of water can improve the reliability and efficiency of thermal power stations by providing the required quality deaeration at the most economical operation of the 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 that is connected to the piping of a heating medium 8. The station is equipped with a regulator is Yes carbon 10 in deaerated make-up water and with regulatory bodies 11 on the pipeline of the heating medium heater source water and 12 on the piping hot water. As the sensor 10 can be used pH meter with transducer readings on the pH value, the concentration of carbon dioxide.

Consider the example of an 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 the overheated water steam extraction the higher potential. 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 flow rate 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 flow rate of the hot water and, conversely, by lowering the concentration of carbon dioxide on a given 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 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. 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, a new method of deaeration can increase the reliability and efficiency of thermal power stations by providing a given concentration of carbon dioxide in de is gaining

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 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 flow rate 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 flow rate of the hot water and on the contrary, at lower concentrations of carbon dioxide 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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