Thermal power station operating process

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

 

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

Known equivalent ways of operating thermal power station, which is produced in the boiler steam is directed into the turbine, the exhaust turbine steam condense in the condenser, the main turbine condensate condensate pump serves in regenerative heaters low pressure and later in the deaerator high pressure auxiliary feedwater dearyou in atmospheric deaerator and served in the path of the primary condensate, flash steam atmospheric deaerator is removed into the atmosphere (see Ryzhkin VIA Thermal power station. M: Energy. 1976. Fig. 14-1 and the description of him p. 203). This analog adopted as a prototype.

Disadvantages analogs and prototypes are reduced reliability and efficiency of thermal power plants due to the lack of quality of the feedwater flow and increase energy consumption for additional feedwater deaeration. In particular, with the increase of air flowing into the vacuum system of the turbine, for example, when changing the mode of operation of the turbine deteriorates the quality of feed water supplied to the deaerator high blood pressure. On the other hand, at high air-tightness of the vacuum system of the turbine are increased energy consumption on the abotu of atmospheric deaerator incremental feed water, despite the sufficient quality of the mixed flow of the main condensate and incremental feed water supplied to the deaerator high blood pressure.

The technical result achieved by the present invention is to increase the efficiency and reliability of thermal power stations by providing high quality streams feed water before the deaerator high pressure under different modes turbine, as well as by reducing energy consumption for atmospheric additional feedwater deaeration.

To achieve this result, a method of operating thermal power station, which is produced in the boiler steam is directed into the turbine, the exhaust turbine steam condense in the condenser, the main turbine condensate condensate pump serves in regenerative heaters low pressure and later in the deaerator high pressure auxiliary feedwater dearyou in atmospheric deaerator and served in the path of the primary condensate, flash steam atmospheric deaerator is removed into the atmosphere.

The peculiarity lies in the fact that the regulation of the flow of vapour atmospheric deaerator produce a given amount of dissolved oxygen in the mixed stream of additional feedwater and main turbine condensate outside the vacuum system of the turbine, for example, the second along the main condensate heater low pressure.

A new way of operating thermal power stations can increase the reliability and efficiency of thermal power plants due to the guarantee given value of dissolved oxygen in the mixed flow of the main condensate and additional feedwater outside the vacuum system of the turbine, i.e. to decrease the intensity of internal corrosion of the pipeline of the main condensate is caused by the inflow of air into the vacuum system of the turbine, and also to reduce the energy consumption for atmospheric additional feedwater deaeration.

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, explaining the proposed method. The station contains a boiler, a steam turbine 1 with a heating selections, condenser, piping main condensate turbine 2 with the inclusion of a condensate pump and regenerative heaters low pressure 3, atmospheric deaerator additional feedwater 4 with connected piping exhaust steam 5 and the heating agent. Atmospheric deaerator equipped with 4 controllers is or dissolved oxygen 6 mixed flow of the main condensate and incremental feed water, which is connected to the oxygen sensor 7 connected to the main pipeline condensate outside the vacuum system of the turbine after the connection point of the pipeline system feed incremental feed water, and valve 8 mounted on the exhaust tube of a flash steam 5 atmospheric deaerator additional feedwater. Pipeline heating agent atmospheric deaerator 4 additional feedwater has a regulatory body 9 connected to the pressure regulator 10, which is supported by the set pressure in the atmospheric deaerator.

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

Produced in the boiler steam is directed into the turbine 1, the exhaust turbine steam condense in the condenser, the main turbine condensate condensate pump serves in regenerative heaters low pressure 3. Leakage of feed water from the steam cycle thermal power plant compensate for incremental feed water, which dearyou in atmospheric deaerator 4, which in the deaerator serves a heating agent, and guide us to the path of the main condensate turbine 2. Regulation of the flow rate of vapour atmospheric deaerator make with the regulating valve 8, the flow regulator flash unit 6 and the sensor for a given value of the dissolved oxygen in the mixed stream of additional feedwater and main turbine condensate outside the vacuum system of the turbine, for example, the second along the main condensate heater low pressure. Sensor 7 measuring the residual oxygen content in the mixed flow of the main condensate and incremental feed water and, when the deviation from the set, for example, due to the increase of air flowing into the vacuum system of the turbine or deterioration of deaeration of additional feedwater flow controller 6 with the regulating valve 8 increases the flow of vapour atmospheric deaerator additional feedwater 4, thereby setting its value necessary and sufficient to maintain a residual oxygen content in the mixed flow of the main condensate turbines and additional feedwater outside the vacuum system of the turbine. On the contrary, when the reduction of air flowing into the vacuum system of the turbine or improve the quality of atmospheric additional feedwater deaeration pulse from the sensor dissolved oxygen 7 supplied to the controller 6, the regulating valve 8 reduce the consumption of steam atmospheric deaerator additional feedwater 4. Next, produce a deaeration of the mixed flow of the main condensate and incremental feed water in the deaerator high pressure and then a nutrient pump procative the t through the high pressure heaters and served in a steam boiler.

Thus, the new method can improve the reliability and efficiency of thermal power plants by reducing the intensity of internal corrosion caused by the high content of dissolved oxygen in the water, and reduce energy costs at atmospheric additional feedwater deaeration.

The method of operation of a thermal power station, which is produced in the boiler steam is directed into the turbine, the exhaust turbine steam condense in the condenser, the main turbine condensate condensate pump serves in regenerative heaters low pressure and later in the deaerator high pressure auxiliary feedwater dearyou in atmospheric deaerator and served in the path of the primary condensate, flash steam atmospheric deaerator removes the atmosphere, characterized in that the control flow of vapour atmospheric deaerator produce a given amount of dissolved oxygen in the mixed stream of additional feedwater and main turbine condensate outside the vacuum system of the turbine, for example for the second course the main condensate heater low pressure.



 

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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

FIELD: heat power engineering.

SUBSTANCE: according to proposed method steam produced in boiler is delivered to turbine, waste steam of turbine is condensed in condenser, and main condensate from turbine is delivered into low-pressure regenerative heaters and further on into higher pressure deaerator by condensate pumps, and additional feed water is deaerated in deaerator. For this purpose heating agent is fed deaerator, and then deaerated additional feed water is delivered into main condensate conduit. Regulation of rate of heating agent of additional feed water deaerator is carried out basing on preset value of content of dissolved in mixture of additional feed water and main condensate of turbines out of the limits of vacuum system of turboplant, for instance, after second low-pressure heater of main condensate in direction of flow.

EFFECT: improved reliability of thermal power station, increased economy.

1 dwg

FIELD: heat power engineering.

SUBSTANCE: method of operation of heat power station includes condensing of waste steam from turbine, heating of turbine condensate by regenerative extraction of steam in regenerative heaters, heating of heating system water from consumers by steam of heating extractions in heating system heaters. According to invention, heat pump is installed in heat power station circuit, part of turbine waste steam is condensed in turbine condenser, and part, in heat pump evaporator, condensate from turbine before heating in regenerative heaters and heating system water getting from consumers before heating in heating system heaters are heated in condensers of heat pump, thus increasing efficiency of power station with heat pump.

EFFECT: increased economy and generation of energy at heat consumption.

1 dwg

FIELD: heat power engineering.

SUBSTANCE: proposed steam-gas power plant contains steam turbine unit with steam boiler operating on solid fuel and steam turbine, and gas-turbine unit with gas turbine using heated compressed air as working medium, surface heater of compressed air for heating compressed air by solid fuel combustion products, and gaseous fuel combustion chamber for additional contact heating of compressed air. Surface heater of compressed air is installed in high-temperature part of convection gas pass of steam boiler.

EFFECT: increased economy of steam-gas power plant at combustion of solid fuel.

2 cl, 2 dwg

FIELD: power engineering.

SUBSTANCE: invention relates to hydroturbine plants in which heated water is used as working medium. Proposed regenerative heat hydraulic turbine plant contains steam generator, cooler injector, compressor, power injector, hydraulic turbine, electric generator, cooler, power injector pump, deaerator pump, deaerator, feed pump, air heater, blower, heat exchanger of heat supply circuit, heat collector. Steam generator is connected to cooler injector, and compressor is connected with cooler and with inlet of injector intake chamber. Outlet of injector is connected with nozzle chamber of power injector into intake chamber of which water cooled in cooler is delivered. Outlet of power injector is connected to hydraulic turbine, and outlet of turbine is connected with cooler and, through pump, with deaerator and also with air heater, heat exchanger of heat supply system and with heat collector.

EFFECT: increased efficiency of plant, reduced cost and load on environment.

2 cl, 2 dwg

FIELD: heat power engineering; thermal power stations.

SUBSTANCE: according to proposed method, steam generated in boiler is directed into turbine, waste steam in condensed in condenser, main condensate of turbines is delivered by condensate pumps into low-pressure regenerative heaters and further on into higher-pressure deaerator, additional feed water is deaerated in vacuum deaerator to which source water and heating agent are delivered. Heating of additional source water is provided by mixing water with condensate of regenerative low-pressure heater first in direction of main condensate flow. Control of rate of condensate of regenerative low-pressure heaters used for heating source additional feed water is carried out basing on preset value of content of dissolved oxygen in mixed flow of additional feed water and main condensate of turbine out of the limits of vacuum system of turbine plant, for instance, after low-pressure heater second in direction of main condensate flow.

EFFECT: improved economy and reliability of thermal power station.

1 dwg

FIELD: heat power engineering.

SUBSTANCE: proposed thermal power station contains steam turbine with main condensate pipeline connected to higher pressure deaerator, additional feed water deaerator with pipelines of source water and heating agent. Station is furnished with regulator of dissolved oxygen content in mixed flow of main condensate and additional feed water. Said regulator is connected with oxygen content pickup connected to main condensate pipeline out of the limits of vacuum system of turboplant, for instance, after second low-pressure heater in direction of main condensate flow and with regulating member installed on heating agent pipeline of additional feed water deaerator.

EFFECT: increased economy and improved reliability of thermal power station.

1 dwg

FIELD: heat power engineering.

SUBSTANCE: proposed thermal power station contains steam turbine with main condensate pipeline connected to higher pressure deaerator, atmospheric deaerator of additional feed water with flash steam outlet and heating agent pipelines. Station s furnished with regulator of dissolved oxygen content in mixed flow of main condensate and additional feed water. Said regulator is connected with oxygen content pickup connected to pipeline of main condensate out of the limits of vacuum system of turboplant, for instance, after low-pressure heater of main condensate second in direction of main condensate flow and with regulating member installed on flash steam outlet pipeline of atmospheric deaerator of additional feed water.

EFFECT: increased economy and improved reliability of thermal power station.

1 dwg

FIELD: heat power engineering.

SUBSTANCE: proposed thermal power station contains at least one steam turbine with process and heating steam extraction, systems of regenerative and line heaters and station medium steam pressure manifold to which combination evaporator plant with multistage evaporator set, heating steam condensate expander of separate evaporator stages, deaerator of multistage evaporator plant and flashing evaporator plant are connected. Cooler of distillate from expander is placed in water pipeline of deaerator of multistage evaporator plant. Source water pipe-line from end condenser of flashing unit evaporator plant is connected through heater, chemical water cleaning unit and pump, to pressure manifold of makeup water of flashing evaporator plant, multistage evaporator plant and heating system. Pipelines of distillate from expander of multistage evaporator plant and flashing evaporator plant are connected to additional water atmospheric deaerator. Water pipeline from atmospheric deaerator is connected to main condensate line of steam turbine.

EFFECT: increased thermal economy of station.

1 dwg

FIELD: thermal engineering; thermal power stations.

SUBSTANCE: proposed thermal power station operation process is characterized in that source water and heating agent are passed through vacuum deaerator, heated in source water and heating agent heater, and steam bled off the turbine is introduced as heating medium into heating agent. Used as heating medium in source water heater is condensate of heating agent heater.

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

1 cl, 1 dwg

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