The method of thermal deaeration of water

 

The invention relates to the field of power engineering and can be used in thermal power plants. A known 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 adjustment of flow rate and temperature of the hot water. When the concentration of carbon dioxide relative to the specified value first increases the flow rate of the hot water, and then, if necessary, increase its temperature. At lower concentrations of carbon dioxide relative to a given value of the first lower the temperature of the hot water, and then reduce its consumption. 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 used in certain 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 (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 the increased energy cost of supply and the heat of the heating agent in 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 flow rates and temperatures of the hot water, but despite this, the temperature and flow greusome modes of consumption and the temperature 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 optimal parameters of the flow and temperature of 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 water is carried out by sequential adjustment of flow rate and temperature of the hot water, and when the concentration of carbon dioxide relative to the specified value and lowering the concentration of carbon dioxide relative to a given value of the first lower the temperature of the hot water, and then reduce its consumption.

A new method of thermal deaeration of water can 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 of the carbon dioxide 9 in the make-up water heating system, which is connected to the sensor, the concentration of carbon dioxide 10 in deaerated make-up water and with regulatory bodies 11 on the piping hot in the van 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 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 carbon dioxide in deaerated make-up water is carried out by sequential temperature control and flow rate of the hot water. When the concentration of carbon dioxide relative to the specified value first increases the flow rate of the hot water, and then if necessary to increase its temperature 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 reduce its consumption.

As the regulator may use commercially available microprocessor controller remikont R-130 to implement about 90 programs control reg the Oia with it under the stated manner consistent regulation of the flow rate of the hot water and its temperature (in this sequence and is the main distinctive feature of the claimed method) when used as a controlled factor residual content of carbon dioxide problem. Operations are blocking 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 changing the flow rate of the hot water and its temperature.

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 the optimal mode of operation of the turbine plant with a maximum production of electricity at thermal consumption.

Claims

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 serial flow control and China first increase the flow of hot water and then, if necessary, increase its temperature 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 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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