605results about "Steam boilers components" patented technology

The invention relates to the field of boiler fixing devices, in particular to a boiler fixing device which comprises two rotating frames, two sets of clamping pieces, an adjusting piece, a plurality of rotating wheels and a limiting rod. The two rotating frames are symmetrically arranged on the fixed seat, and the first openings of the two rotating frames are opposite to each other; the two sets of clamping pieces are installed in the two rotating frames respectively, a clamping space is formed between each set of clamping pieces, a second opening is formed in the side, close to the first opening, of the clamping space, the width of the second opening is smaller than the inner diameter of the clamping space, and the width of the second opening is adjustable; the adjusting piece is inserted into the end parts of the rotating frames, is in transmission connection with the clamping piece and is used for adjusting the clamping piece to move along the opposite directions of the two rotating frames; the multiple rotating wheels are installed on the surface of the clamping piece and attached to the pipeline in the clamping space. The limiting rod is inserted into the fixing base, and when the clamping piece is in a stopped state, the surface of the limiting rod is clamped to the upper end face and the lower end face of the clamping piece, and the clamping piece is fixed.

The embodiment of the invention discloses a pressure control method and system for a once-through steam generator of a nuclear reactor, and relates to the technical field of nuclear power. Determining power deviation according to the operation power and the secondary circuit load; according to the power deviation, the rated power corresponding to the nuclear reactor and the rated feed water flow corresponding to the once-through steam generator in the nuclear reactor, pressure regulation information is determined; and adjusting the pressure of the once-through steam generator according to the pressure adjusting information. According to the embodiment of the invention, a PID controller is not needed in the process of determining the pressure regulation information, but the pressure regulation information determined based on the power deviation directly acts on the feed water flow regulation valve, so that rapid and accurate OTSG pressure control can be realized.

The invention discloses a boiler operation intelligent diagnosis platform based on multi-source data fusion. The boiler operation intelligent diagnosis platform comprises a data acquisition and preprocessing module, a multi-source data fusion and feature extraction module, an intelligent diagnosis and decision support module and a man-machine interaction and alarm module. According to the invention, a modularized multi-source data fusion intelligent diagnosis platform is constructed, various heterogeneous data are uniformly processed through a data acquisition and preprocessing module, and a high-quality data basis is provided for upper-layer analysis; a multi-source data fusion and feature extraction module is used for deeply mining associated features among data, and a fusion feature set capable of comprehensively reflecting the boiler health state is constructed; and finally, through an intelligent diagnosis and decision support module, in combination with historical data and real-time fusion features, early warning, accurate positioning and root analysis of boiler faults are realized, an operation and maintenance mode is converted into predictive maintenance from post-maintenance and regular maintenance, and the safety and reliability of boiler operation are remarkably improved.

The invention discloses a steam utilization device for steam turbine overhaul, and belongs to the technical field of steam utilization, the steam utilization device comprises an equipment base, a heat exchange box body is fixedly mounted at the top of the equipment base, the top of the heat exchange box body is fixedly connected with an evaporation boiler through a heat conduction structure, and the evaporation boiler and the heat exchange box body are in heat conduction fit; an energy conversion shell is fixedly installed at the position, close to the heat exchange box body, of the top of the equipment base, a first-stage condenser is fixedly installed at the position, close to the energy conversion shell, of the top of the equipment base, and the inlet end of the first-stage condenser communicates with the outlet end of the energy conversion shell in a sealed mode through a pipeline. High-temperature and high-pressure steam firstly enters the heat exchange rectangular pipe to release heat energy, condensate water containing impurities is evaporated and purified through the discharged high-temperature steam, thorough separation of the impurities and a water body is achieved, and the situation that steam water containing the impurities enters a steam turbine again to pollute the steam turbine is fundamentally avoided.

The utility model discloses a composite high-voltage solid heat storage electric boiler, and relates to the field of electric boilers. A composite type high-voltage solid heat storage electric boiler comprises a boiler cabinet and further comprises an installation cavity, a heat storage cavity, a heat storage cavity and a heat storage cavity, the bearing plates are fixedly connected to the inner wall of the mounting cavity at equal intervals; the solid heat storage bricks are placed on the bearing plate; the connecting rod is connected into the mounting cavity in a sliding mode, and a plurality of fixing blocks used in cooperation with the bearing plate are fixedly connected to the connecting rod at equal intervals; according to the utility model, through the cooperation of the pressurizing pipe, the piston disc, the connecting rod and the fixing block, the solid heat storage brick can be preliminarily fixed, and the heat conduction rod conducts heat in the mounting cavity to the sleeve, so that gas in the sleeve is heated and expanded to increase air pressure, and the clamping force of the fixing block on the solid heat storage brick is further increased; the fixing stability of the solid heat storage brick in the working process is effectively improved, looseness caused by factors such as vibration is reduced, and stable operation of equipment is guaranteed.

This application belongs to the field of nuclear power plant engineering, specifically relating to a device for secondary side maintenance of a horizontal steam generator used in a nuclear power plant. The device includes: an air supply duct, an air supply fan, an exhaust duct, and an exhaust fan. One end of the air supply duct enters the steam generator through a manhole and extends to the bottom of the heat transfer tubes of the steam generator; the other end of the air supply duct is connected and fixed to the outlet of the air supply fan. One end of the exhaust duct is placed on an underwater steam distribution plate inside the steam generator, and the other end passes through the manhole and is connected and fixed to the inlet of the exhaust fan. No special placement platform is required; any location on site can be used as a placement location. Internal maintenance can be achieved simply by opening one manhole, improving maintenance efficiency.

The utility model discloses a steam boiler ash removal device, relates to the technical field of boiler ash removal, and aims to solve the problem of low boiler ash removal efficiency in the prior art, the steam boiler ash removal device comprises a moving mechanism, the moving mechanism comprises a bottom plate, universal wheels, a push handle and a hydraulic elevator, and a mounting plate is fixed at the top of the moving mechanism. And supporting plates are fixed to the two sides of the top of the mounting plate correspondingly, a collecting box is arranged between the two supporting plates, the two supporting plates are rotationally connected with ash removal mechanisms correspondingly, and each ash removal mechanism comprises a fixing cylinder, a second servo motor, an ash removal shovel, a spiral conveying rod and a discharging pipe. According to the boiler ash removal device, the ash removal mechanism is inserted into the boiler, the ash removal shovel is inserted into the boiler ash, the second servo motor drives the spiral conveying rod to rotate, the boiler ash is conveyed in the fixing barrel and discharged into the collecting box through the discharging pipe, and therefore manual ash removal of the boiler is replaced, the labor intensity of workers is relieved, and the working efficiency is improved. And the working efficiency can be improved.

The invention discloses a heat pipe type steam generator based on boiler exhaust smoke waste heat utilization, and relates to the field of steam generators, the heat pipe type steam generator specifically comprises a steam generator shell, a heating furnace is arranged in the steam generator shell, a front heat exchange smoke pipe is arranged on one side of the heating furnace, and rear heat exchange smoke pipes are arranged on the two sides of the front heat exchange smoke pipe; a smoke outlet is formed in the top of the steam generator shell, and a residual smoke pushing mechanism and an intermittent smoke discharging mechanism are arranged on one side of the rear heat exchange smoke pipe. The multiple heat conduction bins are arranged in the area located at the tail end of the heat exchange smoke pipe, hot smoke is fed into the heat conduction bins through the push plate moving in a reciprocating mode, the heat conduction bins conduct heat into water again, the heat utilization effect of the hot smoke is improved, meanwhile, the cover ring and the pressing plate are arranged at the smoke exchange position, and the heat exchange efficiency is improved. Hot flue gas is directly extruded and fed into the heat exchange flue gas pipe through reciprocating motion, the residence time of the high-temperature flue gas is shortened, and heat waste of the high-temperature flue gas is avoided.

The systems and methods of the invention pertain to analyzing steam generator tube data for the detection of wear. Further, the invention is capable of performing a comparison of current tube signal data to baseline or historic tube signal data, e.g., from previous and / or the first, in-service inspection of the steam generator. The systems and methods are automated and can generate results to show potential tube-to-tube contact wear areas as well as the progression of tube-to-tube gap reduction within a steam generator tube bundle. In certain embodiments, the invention is capable of comparing current and historical eddy current data to determine the difference that may be related to degradation or other interested phenomena, and of processing and trending historical comparison results to establish normal variance and detect abnormal variances.

The application provides a coupling system and a control method for improving the variable load rate of a secondary reheat unit integrated with a medium-temperature energy storage, wherein the medium-temperature energy storage system is connected with the high-pressure cylinder outlet through a high-pressure cylinder outlet steam extraction valve during the energy storage process, is connected with the deaerator outlet through a pressure relief valve, is connected with the feed water pump outlet through a deaerator outlet regulating valve during the energy release process, and is connected with the boiler feed water inlet through a pipeline, so as to form a secondary reheat unit integrated with the medium-temperature energy storage; and a load splitting method is provided, which splits the whole unit load instruction into a medium-temperature energy storage system load instruction and a secondary reheat unit boiler coordination system load instruction, and the medium-temperature energy storage system load instruction is realized through high-pressure cylinder exhaust valve opening degree control and deaerator outlet regulating valve opening degree control in the load decreasing and increasing processes; through the coupling system and the load splitting method, the time-space transfer of the unit energy in the variable load process is realized, the variable load rate of the secondary reheat unit is improved, and the flexibility of the unit is enhanced.

A nuclear power plant comprising at least one nuclear reactor having a steam generator, a steam cycle including the steam generator, a first turbine fluidly coupled to the steam generator, a first condenser fluidly coupled to the first turbine, and a feedwater heater fluidly coupled to the first condenser and the steam generator, an intermediate thermal loop including the first condenser, and an evaporator, and an organic cycle including the evaporator, a second turbine fluidly coupled to the evaporator, a second condenser fluidly coupled to the second turbine, and a heat exchanger fluidly coupled to the second condenser and the evaporator.

This utility model discloses a heating device for drying a fluidized bed. It includes a steam boiler, with a steam pipe fixedly connected to the upper surface of the steam boiler. The steam pipe is fixedly connected to a shell, with a fluidized bed above the shell and a wind chamber below. Multiple layers of steam ring pipes are embedded in the inner wall of the fluidized bed. The steam ring pipes are fixedly connected to a condensate pipe and a steam riser pipe. The steam riser pipe is fixedly connected to a spiral finned tube, which is fixedly connected to the wind chamber. A fan is fixedly connected to the left surface of the wind chamber, and an air inlet pipe is fixedly connected to the upper surface of the wind chamber. An air distribution plate is fixedly connected to the upper surface of the air inlet pipe. Through this structure, the embedded steam ring pipes avoid the problem of adhesion in areas prone to dead zones on the surface of the internal heat exchanger. Furthermore, the steam heat is transferred to the fluidized air through the spiral finned tubes to achieve primary drying, while the material is further dried secondaryly through the embedded steam ring pipes within the fluidized bed, fully utilizing a single heating system for double-efficiency material drying.

The utility model provides an independent circulation pipeline evaporator which comprises an ascending pipe connected to a steam pocket; the first evaporation screen is communicated with the ascending pipe through a first ascending communicating pipe, the first evaporation screen comprises a plurality of first pipe pieces, and the first pipe pieces are arranged on two flues in parallel; each first duct piece is arranged in a bow shape in the vertical direction, so that the heating area of each first duct piece is increased, and meanwhile, a steam soot blower can penetrate through each first duct piece and carry out decoking and soot cleaning on each first duct piece; the first descending communicating pipe is connected between the first evaporation screen and a descending pipe, and the descending pipe is connected to the bottom of the steam pocket and used for conveying water in the steam pocket to the first descending communicating pipe and then conveying the water to the first evaporation screen. The problems of overtemperature and high-temperature corrosion of the superheater mentioned in the background technology are solved.

This invention provides a novel PTC steam generator, comprising a PTC heating core. The end of the PTC heating core furthest from the outlet is connected to a flow channel frame. After connection, the PTC heating core is installed inside a housing. A sealing ring is installed at the outlet end of the housing, followed by a sealing device. The housing has a liquid inlet and a gas outlet. The flow channel frame has spiral flow channel ribs centered on the PTC heating core. These ribs, along with the outer surface of the PTC heating core and the inner surface of the housing, form a spiral liquid flow channel, ensuring sufficient contact between the liquid and the PTC heating core to generate gas. Compared to existing technologies, the advantages of this invention are: the spiral flow channel ribs centered on the PTC heating core maximize the utilization of the PTC heating core's surface to create a liquid flow channel, ensuring sufficient contact between the liquid and the heat source PTC heating core to generate gas, thus improving product performance.

This utility model relates to the field of steam equipment technology, specifically a steam generator for steam equipment. It includes a housing, a heating chamber disposed inside the housing, a scale-collecting chamber located below the heating chamber, and a water inlet and an air outlet correspondingly disposed on the housing and communicating with the heating chamber. The water inlet is located on the front top of the housing and is angled, while the air outlet is located on the rear top of the housing, with its central axis perpendicular to the outer surface of the housing. The inner opening of the air outlet is located above the heating chamber and the scale-collecting chamber. It also includes a heating element assembled inside the heating chamber, which employs a U-shaped heating tube structure to increase the heating surface area. This utility model improves heating efficiency, reduces costs, and prevents clogging of the air outlet by replacing the single-ended heating tube with a traditional U-shaped electric heating tube and optimizing the air outlet structure of the steam generator.

A method for measuring the deep peak regulation load of a coal-fired boiler in an electric power auxiliary service market comprises the steps that preparation before testing is conducted, specifically, the quality of coal entering the boiler is selected, and all devices in a boiler system are verified; coal with the selected coal quality is put into the boiler to be combusted, and when the boiler load reaches or exceeds the soot blowing threshold value, soot blowing is conducted on the heating surface of the boiler comprehensively; after soot blowing is finished and a preset stable combustion condition is met, the boiler load is gradually reduced according to a preset rule; in the process of reducing the boiler load, monitoring each parameter of each device, and when each parameter exceeds a corresponding safety limit value, determining whether the abnormity is recoverable or not and determining the abnormity type; and for recoverable anomalies, the boiler load is gradually increased according to the type of the anomalies until the parameters are kept stable under the current boiler load for a preset time length, and the current boiler load reaching the preset time length serves as the deep peak regulation load lower limit. The power dispatching accuracy and the operation efficiency of the peak regulation market can be improved, and a reliable basis is provided for dispatching decision making.

The utility model relates to the technical field of steam generation, in particular to a heat storage steam generation device, which comprises an energy storage tank, a steam generator, a steam generator, a steam generator, a steam generator, a steam generator, a steam generator and an energy storage tank, the energy storage tank is internally provided with a partition plate, and the partition plate divides the interior of the energy storage tank into a heating chamber and an energy storage chamber; the electric heater is arranged in the heating chamber; the heat exchange assembly is fixedly connected with the inner wall of the energy storage tank; the heat exchange assembly comprises a heat exchange pipe arranged in the energy storage chamber. The moving structure is fixedly connected with the heat exchange tube and is used for moving the heat exchange tube; the two heat insulation structures are symmetrically arranged on the two sides of the energy storage tank and fixedly connected with the energy storage tank. By operating the moving structure, the moving structure can enable the heat exchange pipe to vertically move, so that the heat exchange pipe is separated from the molten salt, the heat exchange pipe and the molten salt are separated by utilizing the heat insulation structure, liquid in the heat exchange pipe is prevented from being heated in the molten salt melting process, and thus heat loss is avoided.

The invention discloses a water-vapor separation high-temperature steam boiler, which relates to the technical field of steam boilers, and comprises a water-vapor play prevention mechanism, an evaporation chamber, a condensing device, a driving device and a combustion device, the condensing device exchanges heat with high-temperature flue gas, preheats water entering the evaporation chamber, reduces thermal stress, and improves the combustion efficiency. The water vapor moving prevention mechanism controls a water vapor flowing path in the evaporation chamber, so that more sufficient wall-attached flowing or disturbance flowing of water is formed in the evaporation chamber, the heat exchange area of water and the inner wall of the evaporation chamber is increased, the water is promoted to rapidly absorb heat and evaporate, meanwhile, an ascending path of water vapor in the boiler is prolonged, and the heat exchange efficiency is improved. And the retention time and evaporation time of water are prolonged in a limited boiler space, so that the water in the steam can be heated and evaporated more sufficiently, the content of the water carried in the steam is reduced, the dryness and output temperature of the steam are improved, and the energy-saving and water-saving effects in the boiler operation process are achieved.

The present application relates to a method for reducing the start-up time of a water-cooled wall standby furnace, which uses equipment including a gasifier water-cooled wall, a steam drum and a water-cooled wall circulating water pump. The present application makes full use of the heat of the continuous blowdown of the operating series steam drum, and realizes the maintenance of the standby series water-cooled wall temperature, and the system is simple and the control is convenient; compared with the prior art, the present application can reduce the start-up time of the standby furnace, reduce the impact of the gasifier trip on the device operation load, and reduce the economic loss caused by shutdown. According to the water baking time of 8 hours, the present application can reduce the economic loss of 8 hours caused by unplanned shutdown, and according to the gasification scale of 100,000 standard cubic meters / hour of effective gas production, the economic loss can be reduced by nearly 500,000 yuan.

The application relates to a boiler container, which comprises a container with a containing cavity, a plurality of openings in communication with the containing cavity, an inner wall of the container provided with a reflecting layer, and an outer wall of the container provided with a heat insulation layer; a plurality of boilers, at least one of which is arranged in the opening, and any two adjacent boilers are communicated through at least one heat transfer pipe, the heat transfer pipe is arranged in the containing cavity, and the reflecting layer is used for reflecting heat radiated outward by the heat transfer pipe to the heat transfer pipe. As known from the above, the boiler container in the embodiment can reduce the heat dissipation of the heat transfer pipe, reduce the heat energy loss of the boiler container, increase the number of the heat transfer pipes, and guarantee the energy conversion efficiency of the boiler container.

The utility model discloses a boiler with double-color water level display, which comprises a body, a first pipeline, a second pipeline and a double-color water level display device are arranged at one end of the body, the first pipeline and the second pipeline are communicated with the inside of the body, the double-color water level display device is communicated with the first pipeline and the second pipeline, and the double-color water level display device comprises a fixing plate and a glass tube arranged in the middle of the fixing plate. The upper end and the lower end of the glass tube are communicated with the first pipeline and the second pipeline respectively, and a pressurizing tube which is coaxial with the glass tube and used for enhancing impact force of liquid entering the glass tube is arranged at the joint of the end of the first pipeline and the upper end of the glass tube. A sewage discharge pipe which is coaxial with the glass pipe and can be opened and closed is arranged at the joint of the end part of the second pipeline and the lower end of the glass pipe. The boiler anti-scaling device has the advantages that anti-scaling treatment on a boiler is guaranteed, the glass tube can be flushed without a blind area, water level monitoring display is prevented from being affected by accumulation of water granulated slag in the glass tube, and the accuracy of water level monitoring is guaranteed.

NUCLEAR STEAM SUPPLY SYSTEM AND METHOD This disclosure relates to a nuclear steam supply system, comprising: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer, and a steam heat accumulator, where the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other. This disclosure allows for peak levelling load adjustment of the nuclear power plant and steam load adjustment of the steam consumer, while ensuring the operational safety of an electrical grid and a reactor. Summary figure: Fig. 1

The utility model relates to a steam generator with a metal shell, which comprises the metal shell, a heating membrane, a generator main body, an anti-dry-burning temperature controller and a fuse, and the anti-dry-burning temperature controller, the heating membrane and the fuse are connected in series and fixed through a circuit. The metal shell is formed by bending a metal plate and sequentially comprises a metal top plate, a first metal side plate, a metal bottom plate and a second metal side plate, and the metal top plate and the second metal side plate are locked through a buckle structure; the metal shell is provided with an arrangement cavity with front and rear openings, the generator body is arranged in the arrangement cavity, the heating membrane is attached to the top face of the generator body, and the fuse is located in the arrangement cavity and abuts against the bottom of the generator body. The dry-burning-resistant temperature controller is installed on the metal top plate in a penetrating mode, and a detection part of the dry-burning-resistant temperature controller is attached to the heating membrane. The utility model provides a steam generator with another shell structure.

To provide a method for forming a functional self-fluxing alloy coating, capable of exhibiting excellent wear resistance, corrosion resistance and lubricity and suppressing the suppression effect of the adhesion and deposition of ash (clinker) for a long period of time.SOLUTION: A method for forming a functional self-fluxing alloy coating comprises: the thermal spray coating formation step of forming a self-fluxing alloy thermal spray coating on the surface of a base material; the lubricant composition impregnation step; the drying step of drying the thermal spray coating including the impregnated lubricant composition to remove the solvent and form a thermal spray coating including the solid lubricant particles; and the self-fluxing alloy remelting step of heating the thermal spray coating including the solid lubricant particles to remelt the self-fluxing alloy.SELECTED DRAWING: Figure 1

The application discloses a layered collaborative control method for auxiliary deaerator pressure stabilization of a molten salt steam generator, builds an auxiliary optimization control layer on the original coordination control system of the unit, and forms a layered collaborative architecture of "MPC optimization decision-CCS execution tracking". The upper layer calculates and rolls over the optimal set values of the molten salt steam pressure, the deaerator pressure and the feedwater temperature in real time based on model predictive control (MPC); the lower layer realizes fast and stable tracking of the set values through three control loops of cascade-ratio control, three-impulse collaborative control and PID control embedded in CCS, and is seamlessly coordinated with the original feedwater and combustion control logic of the unit. The application effectively solves the problems of multivariable strong coupling, large response inertia and strong mode switching impact of the coal-molten salt coupling system in deep load regulation, significantly improves the load response speed, operation safety and low-load economy of the unit, and enhances the accommodation capacity of the power system to new energy.

The utility model discloses a glycerol vacuum condensation processing device which comprises an evaporation boiler, a condensation mechanism, a vacuum pump and an air guide pipe, a valve cylinder is arranged on the evaporation boiler, a sliding plate is installed in the valve cylinder in a sliding mode, a pressure relief spring is fixedly installed between the sliding plate and the top wall of the inner side of the valve cylinder, a guide rod is fixedly installed at one end of the sliding plate, and the air guide pipe is fixedly installed at the other end of the sliding plate. A sealing plate is fixedly installed at the other end of the guide rod, a sealing block is slidably installed in the center of the sealing plate, a pressure limiting spring is arranged between the sealing block and the sliding plate, a communicating pipe is fixedly installed on the valve cylinder, and a cooling pipe is fixedly installed at the other end of the communicating pipe. The pressure in the steam kettle can be automatically adjusted, potential safety hazards caused by too high pressure and raw material waste caused by steam overflow due to pressure relief can be avoided, the pressure relief threshold value of the steam kettle can be flexibly adjusted, the system can conduct self-adaptive adjustment according to actual requirements, and the purification efficiency and flexibility are improved.

This invention discloses a system for preventing overheating and cracking of the heating surface fins in a power plant boiler. The system, used in power plant boilers, includes: heating surface tubes extending along a first direction, multiple heating surface tubes spaced apart along a second direction; fins connecting adjacent heating surface tubes; and rib structures disposed on the wall surface of the fins facing the outer side of the furnace, with the rib structures located in the middle region of the fins along the second direction. According to this invention, by adding rib structures to the wall surface of the fins facing the outer side of the furnace, and with the rib structures located in the middle region of the fins along the second direction, the system can effectively dissipate heat from the middle region of the fins along the second direction without changing the fin width, overcoming the problem of fin cracking caused by fin overheating in the prior art, which leads to cracking and leakage of the heating surface tubes.

The invention relates to the technical field of intelligent cooking, in particular to a method for detecting faults of a steam generator and cooking equipment. The steam generator is provided with a temperature sensor which is used for detecting the temperature of the steam generator; the method comprises the following steps: acquiring a first temperature value acquired by a temperature sensor; according to the method for detecting the fault of the steam generator, the steam generator is provided with a temperature sensor, so that the temperature of the steam generator is detected through the temperature sensor; under the condition that the first temperature value represents that the temperature sensor is not abnormal within the preset temperature range, whether the heating function actually takes effect or not is further judged by monitoring whether the temperature variation of the steam generator within the preset heating time length is smaller than the preset variation threshold value or not, accurate positioning of the steam generator fault root is achieved, and the accuracy of the steam generator fault root is improved. And the maintenance efficiency and the user satisfaction can be improved.

To appropriately prevent a problem caused by entry of particles together with fluid into a cylindrical nozzle stub part installed so as to surround a through hole formed in a pipe through which the fluid flows.SOLUTION: A plug structure 200 blocks a through hole 52 formed in a pipe through which fluid flows, and the plug structure 200 comprises: a cylindrical nozzle stub part 210 arranged so as to surround the through hole 52, and having a base end part 211 joined to an outer peripheral surface of a pipe 50; and a plug 220 inserted into the nozzle stub part 210, and joined to a tip part 212 of the nozzle stub part 210. The plug 220 comprises a sealing part 222 sealing the through hole so that an internal space IS1 of the pipe 50 and an internal space IS2 of the nozzle stub part 210 do not communicate with each other.SELECTED DRAWING: Figure 5

The present invention relates to a system and a method for automatically setting a main steam condensate drain valve closing setpoint of a nuclear power plant, and, specifically, to a system and a method for automatically setting a main steam condensate drain valve closing setpoint of a nuclear power plant, which apply different setpoints to respective condensate drain valves since the pressure of main steam and a condenser of a nuclear power plant varies according to operating conditions such as turbine output, and the discharge speeds of the condensate vary according to the different installation positions of condensate drain valves.