Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
  • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
  • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
  • F01K7/40—Use of two or more feed-water heaters in series
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
  • F22D11/00—Feed-water supply not provided for in other main groups
  • F22D11/006—Arrangements of feedwater cleaning with a boiler

Definitions

• the present invention relates to a condensate / water condensing device for a steam generator used in a nuclear power plant or a thermal power plant, and in particular, has a feed water heater for using steam extracted from a turbine for heating feed water.
• the present invention relates to a condensate water supply device for a steam generator.
• the steam generated in the reactor drives a high-pressure turbine and a low-pressure turbine, and then enters a condenser where it is condensed.
• the water condensed in the condenser is pressurized by the condensate-pump and passed through the condensate filtration desalinator and the condensate desalinator before being desalinated.
• the heated water is pressurized by a water supply pump, then heated again by a water heater (hereinafter referred to as the final water heater) and supplied to the reactor.
• a water heater hereinafter referred to as the final water heater
• a plurality of feedwater heaters on the upstream side near the condenser are heated by steam discharged from the low-pressure turbine, and the feedwater heaters on the downstream side are high-pressure turbines. It is heated by the steam extracted from the high-pressure steam system.
• the oil discharge steam condenses and returns to the condenser after heating the feedwater in each water heater.
• a condensate water supply system having a condensate in which condensate condensed by a feed water heater is transferred to a condenser has the following two problems. ,
• the extracted steam is condensed by the feedwater heater, and is supplied to the reactor as feedwater.
• the condensate condensed by the oil discharge steam accounts for about 40% of the total lined water volume.
• the condensed condensate, still temperature when flowing out the feed water heater of the most upstream side is high, the amount of heat possessed by the condensate is reaches about 1. 0 X 1 0 8 Kcal h.
• An object of the present invention is to provide a condensate water supply device capable of simultaneously improving the thermal efficiency of a steam generator and reducing the desalination capacity.
• a feature of the present invention is a steam generator, a turbine driven by steam generated by the steam generator, a condenser provided downstream of the turbine, and a desalter provided downstream of the condenser.
• a feedwater heater in a power plant comprising: a feedwater heater provided downstream of the desalter; wherein the condensate condensed by the feedwater heater is supplied to a water pipe downstream of the desalter. The point is that a pipe was provided, and a filter was provided in this pipe.
• the present invention directs the condensate to the feedwater pipe downstream of the desalter. Contact and raise the water supply temperature. This makes it possible to make effective use of the amount of heat in the re-grid system and improve thermal efficiency.
• the conventional equipment requires a desalinator with a capacity (100%) capable of desalinating the total feedwater. .
• the present invention focuses on the fact that the condensate condensed by the feed water heater does not require water to pass through the desalination unit, and only the water supplied from the condenser is included in the total water supply. Is configured to pass through a desalinator.
• the size of the water supply supplied from the vessel can be desalted.
• the condensed water condensed by the feedwater heater is often mixed with a clad, which is filtered by a filter (for normal temperature) provided in the pipe for returning the condensed water to the feedwater pipe. Removed.
• the desalinator capacity can be lowered while using the low-temperature filter.
• FIG. 1 is a diagram showing the overall configuration of a steam generator having a condensate water supply device according to one embodiment of the present invention.
• FIG. 2 is a diagram showing only a part of the condensate water supply device according to the present invention out of the overall configuration shown in FIG.
• FIG. 3 is a diagram similar to FIG. 2 and shows the configuration of a conventional condensate water supply device.
• FIG. 4 is a thermal settlement diagram for explaining the thermal efficiency of the steam generator having the conventional condensate water supply device shown in FIG.
• FIG. 5 is a thermal settlement diagram for explaining the thermal efficiency of the steam generator having the condensate water supply device of the present invention shown in FIG.
• FIG. 6 is a diagram showing another embodiment of the present invention.
• FIG. 1 to FIG. Fig. 3 shows the configuration of a conventional condensate purification system.
• the steam generated in the reactor 1 passes through the high-pressure turbine 2, the moisture separator 3, and the low-pressure turbine 4, and is guided to the condenser 6.
• 5 is a generator.
• the steam is converted to water by the condenser S, it passes through the condenser pump 7, the room temperature filter 8, and the desalinator 9, and then from the feed water heater 16 (first stage feed water heater) to the feed water heater 11 (Final stage feed water heater) and the temperature rises to reactor 1.
• 10 is a feedwater pump.
• the feedwater heaters 11 and 12 are heated by steam extracted from the high-pressure steam system such as the high-pressure turbine 2.
• the feed water heaters 12 to 1 S are heated by the steam discharged from the low-pressure turbine 4.
• the condensate from the feed water heater 1 S in the conventional device flowed into the condenser S.
• a drain pump 20 and a filter 21 are provided so that the condensate can be returned to the water supply pipe downstream of the condensate desalinator 9.
• the drain pump 20 is installed to increase the pressure of the condensate water, tighten the water to the room temperature filter 21, and then smoothly supply the condensate water to the water pressurized by the condensate pump 7. I have.
• the room temperature filter 21 is installed to remove the clad 'mixed with the condensate from the feed water heaters 11-1S.
• Fig. 4 shows the heat balance diagram for the conventional device
• Fig. 5 shows the heat balance diagram for one embodiment of the present invention.
• the figures in the heat balance diagram used here are the approximate values of the standard electric power of the 11,000-kilogram nuclear reactor-reactor, which is the standard electric power of the Shaoshui nuclear power plant.
• the reactor 1 outlet steam condition, the amount of heat consumed for heating the feedwater, and the condenser S outlet water supply condition are the same.
• the water supply condition of the conventional device (Fig. 4) is-, assuming that there is no heat input from the condenser S to the S-th feedwater heater 1S, the temperature at the inlet of the S-th feedwater heater 1S is 33 C , Enthalpy 33 Kcal z kg, then heated by a six-stage heater, the temperature at the outlet of the 1st water heater 11 was 2 15 ° C, enthalpy 2 2 1
• the ratio of ripening heat of feedwater to steam heat of reactor 1 outlet that is, the ratio of heat recovery is about 33.4%.
• OMPI Condensed condensate (temperature 42. C, enthalpy 42 Kcal / kg) is added. For this reason, at the inlet of the 6th water heater 16, the temperature is 37 “C, enthalpy 37 Kcal / kg, at the outlet of the 1st water heater 11 1, the temperature is 2 19 ° C, enthalpy 2 In this case, the rate of heat recovery is about 34.0%.
• the difference in the amount of heat recovered is 25640 x 10 3 Kcal h, which is approximately 30,000 kilo-kilos. -This value is less than 3% of 1.1 million kilowatts of electrical output.
• G flow rate (tonZhr) H: enthalpy (KcalZkg) (steam) h: enthalpy (cal / kg) (water)
• the present invention provides a lined water drain from the condenser 6. Since the desalinator 9 is required for the plant, the desalinator 9 can be reduced to 60% capacity.
• the filter requires the entire lined water capacity. By distributing 60% capacity to the filter and 40% capacity to the filter 21, the overall capacity is 100%, which is the same as before.
• the present invention is characterized in that the capacity of the desalter 9 is reduced by using a low-temperature filter.
• the drain pump 20 is added.
• This embodiment is different from the embodiment shown in FIG. 1 in that the condensed water condensed in the high-temperature side feed water heater 11 is passed through a hot-air filter 22 and the condensate is cooled. That is, it is returned to the water supply pipe on the suction side of pump 10.
• the condensed water condensed by the low-temperature side water heaters 12 to 16 as in Fig. 1 is pressurized by the drain pump 20, passed through the filter 21, and then condensed.
• the water is pressurized at 7 and is supplied smoothly.
• Filters 21 and 22 installed in the condensed water return pipe remove the cloud mixed in the condensate with a lined water heater 11 to 16
• the condensed water condensed by the high-temperature side feed water heater 11 can be passed to the feed water pump 10 suction water supply pipe, eliminating the need for installing a new drain pump. .
• the capacity of the drain pump 20 can be reduced from the value shown in FIG. 5 by the condensed water condensed by the hot water supply heater 11.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Water Supply & Treatment (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Heat Treatment Of Water, Waste Water Or Sewage (AREA)
• Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
• Treatment Of Water By Ion Exchange (AREA)

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• 1983
  • 1983-06-02 JP JP58098452A patent/JPS59222793A/ja active Granted
• 1984
  • 1984-06-01 EP EP19840902077 patent/EP0149677A4/en not_active Withdrawn
  • 1984-06-01 WO PCT/JP1984/000279 patent/WO1984004952A1/ja not_active Application Discontinuation

Patent Citations (2)

Non-Patent Citations (2)

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