16 results about "Helium temperature" patented technology

The application discloses a kind of salt cavern helium storage wellbore-cavity-surrounding rock temperature field prediction method.Real-time monitoring salt cavern helium storage operation dynamics, including but not limited to wellhead pressure and injection-production rate and other data, based on the collected helium injection-production operation data, combined with the basic parameters of wellbore composite structure, the numerical calculation of helium flow and heat transfer equation is carried out;Again based on the prediction result of helium temperature field in wellbore, the convection law of helium in cavity is solved, and then the coupling heat transfer between cavity and surrounding rock is calculated, to realize the accurate prediction of wellbore-cavity-surrounding rock temperature field finally.

A circulating refrigeration system without liquid helium consumption. The system comprises: a liquid-helium-free refrigerating machine (40); a copper shielding tube (10), one end of the copper shielding tube (10) being connected to a shielding cylinder (5) of the liquid-helium-free refrigerating machine (40), and a first-stage cold head connector (11) and a second-stage cold head connector (13) being provided at the other end of the copper shielding tube (10); a first-stage cold shield, which is connected to the first-stage cold head connector (11) by means of a copper braid and is arranged on the outer ring of a μ metal cover; the μ metal cover, which is connected to the first-stage cold head connector (11) by means of the copper braid and is connected to the first-stage cold shield by means of a first-stage cold shield copper braid, wherein the μ metal cover, as a fixing ring, is in vacuum connection with a lower pole piece of an electron microscope, and the μ metal cover is connected to a Z-axis piezoelectric ceramic holder in a sample chamber (8) by means of a thermally insulating gasket; and a sample stage fixing member (28), which is connected to the second-stage cold head connector (13) by means of the copper braid. The present application can achieve a required liquid-helium temperature range environment for a long time, thereby greatly reducing the experiment cost, reducing mechanical vibrations, improving the transverse resolution, and thus realizing an ultrahigh resolution of an electron microscope.

The invention discloses a method for calculating the surface temperature of different batches of fuel spheres of a pebble-bed high-temperature gas cooled reactor, which comprises the following steps of: performing grid division on the pebble-bed high-temperature gas cooled reactor, and calculating the helium temperature, the heat exchange coefficient and the grid power of the pebble-bed high-temperature gas cooled reactor; establishing the relationship between the average temperature of the grid and the surface temperature of the fuel balls by using a volume averaging method, calculating the power of the different batches of fuel balls in the grid according to the power ratio of the different batches of fuel balls in the grid, and obtaining the steady-state energy conservation equation of the different batches of fuel balls according to the steady-state energy conservation equation of the grid; compared with a widely used method for calculating the surface temperature of the fuel balls by solving the one-dimensional heat conduction equations of the fuel balls of different batches, the method for calculating the surface temperature of the fuel balls of different batches has the advantages that the calculation efficiency is higher; and meanwhile, certain calculation accuracy is guaranteed, and the requirement of engineering calculation can be met.

The invention discloses a near space floating air ball thermal characteristic calculation method. Comprising the following steps: establishing a near space floating balloon thermal environment model, establishing a near space floating balloon skin and helium temperature thermal balance differential equation, and establishing a near space floating balloon kinematic model considering a wind field environment and volume change; the method comprises the following steps: establishing a thermal environment model of a floating air ball, simultaneously solving differential equations of skin temperature and helium temperature, and differential equations for controlling horizontal and vertical movement of the floating air ball, and the like, establishing a detailed thermal environment model of the floating air ball, and introducing the influence of an external wind field on an external convection environment. Helium temperature change caused by external acting of volume expansion in the balloon rising process and buoyancy weight balance change caused by helium leakage are considered in a helium temperature heat balance equation. According to the method, the changes of the external skin temperature, the internal helium temperature, the volume and the three-dimensional motion trail of the floating balloon in the whole rising and flat flying process can be obtained at the same time, and the calculation accuracy is improved.

The application discloses a high-temperature gas cooled reactor nuclear power plant high-pressure heater disassembly transient compensation system and a working method thereof, and belongs to the technical field of nuclear power. When the unit is normally operated, part of steam is extracted from main steam to heat low-temperature molten salt, and heat is transferred to high-temperature molten salt and stored in a high-temperature molten salt storage tank; when a high-pressure heater disassembly transient condition occurs, the system automatically switches feed water to a second heat exchanger, transports high-temperature molten salt in the storage tank to the second heat exchanger to heat feed water, and returns low-temperature molten salt after heat exchange and cooling to the low-temperature molten salt storage tank for storage. Through the system, the feed water temperature at the steam generator inlet can be stabilized, the cold and hot helium temperatures of the primary loop are further stabilized, reactor accidents caused by severe condition fluctuations are prevented, the risk resistance of the unit is improved, the unit can be stably operated and power generation is maintained, and the system has high safety and economy.

A low-temperature temperature calibration system in a superfluid helium temperature range under a magnetic field environment, which is used to calibrate a thermometer in the 1.8K liquid helium temperature range. The system includes a cryogenic dewar, a cryogenic constant temperature system, a sample chamber, a superconducting magnet system, and cryogenic measurement and control equipment. The cryogenic dewar consists of an outer vacuum chamber assembly and a radiation shield assembly located in the vacuum chamber. Among them, the vacuum chamber consists of a top cover and a cylinder body, and a vacuum unit that provides negative pressure. The cold screen is hoisted in the cylinder body; the sample chamber consists of a cavity and a sample rod. The sample chamber is installed at the center of the top cover, extends downward to the center of the vacuum chamber, and a heater is provided at the bottom. The sample rod is inserted into the sample chamber, and a sample rack is provided at the bottom; the cryogenic constant temperature system consists of two GM refrigerators, which are respectively installed on both sides of the sample chamber, and the main part extends into the vacuum chamber; the superconducting magnet system is hoisted around the sample rack. The low-temperature temperature calibration system of the present invention can reduce the consumption and waste of liquid helium and significantly reduce costs.

The invention provides a method and device for controlling helium inlet pressure through a variable-temperature surge tank, and relates to the field of low-temperature systems.The device comprises a helium circulating system and a temperature adjusting system, the temperature adjusting system comprises a buffer tank, a coiled tube heat exchanger and a cold water bath unit, and the buffer tank is connected with the cold water bath unit; the cold water bath unit is arranged at the outlet end of the buffer tank and is used for cooling the helium to normal temperature so as to ensure that the helium temperature does not exceed a preset value. According to the method and the device for controlling the helium inlet pressure through the variable-temperature surge tank, the problem that the normal temperature and the normal pressure of pressurized helium cannot be recovered or pressure fluctuation exists is solved.

The utility model provides a safety valve helium protection structure, and particularly relates to the technical field of low-temperature equipment, the safety valve helium protection structure is connected with a first positive pressure connecting pipe through a micro-positive pressure helium system, and then the first positive pressure connecting pipe is sequentially connected with an inlet flange, a safety valve, an outlet flange, a negative pressure connecting pipe and a negative pressure pipeline. When the negative pressure pipeline leaks, micro-positive pressure helium enters the negative pressure pipeline, it is ensured that air outside the system cannot enter the system, and stable operation can be achieved in a 2K superfluid helium temperature area.

The invention provides a reactor outlet temperature control method and system of a miniature high-temperature gas cooled reactor nuclear power supply device, the nuclear power supply device and a nuclear power supply system, and belongs to the technical field of miniature high-temperature gas cooled reactor control. The control method comprises the following steps: acquiring a helium temperature set value, a helium temperature measured value, a reactor power measured value and a load set value of a reactor outlet; determining a reactor power target value according to a helium temperature set value and the helium temperature measurement value; determining a target rod speed according to the reactor power measurement value, the reactor power target value and the load set value; and driving the control rod to move according to the target rod speed so as to adjust the reactor power and realize helium temperature control of the reactor outlet. The control method is used for solving the problems that the temperature-power disturbance amplification effect caused by the low inertia of the miniature high-temperature gas cooled reactor and the mismatch contradiction of the dynamic response of the first / second loop cannot be inhibited in the prior art.

The application relates to the technical field of nuclear reactor engineering safety, and discloses a helium temperature field technical balancing device and method for a high-temperature gas cooled reactor, which comprises a reactor hot gas guide pipe, a mixed flow guide component fixed in the guide pipe, a temperature monitoring array, an active spoiler system integrated on the component and a control unit. The mixed flow guide component has a porous honeycomb structure, and the active spoiler system comprises rotatable spoilers and a wall-penetrating driving mechanism. According to the application, the airflow is physically divided by the static honeycomb structure, the spoilers are deflected by driving the spoilers according to the real-time monitored temperature difference data by the control unit, directional disturbance is applied to the local high-temperature area, thermal expansion compensation and pressure boundary sealing design are adopted, the high-temperature and high-pressure working conditions are adapted, and the fault reset function is provided, so that the helium thermal stratification problem is effectively solved, and the safe operation of the reactor hot gas guide pipe and downstream equipment is guaranteed.

The invention relates to the technical field of measuring devices, in particular to an RRR value measuring device and a measuring method.The RRR value measuring device is internally provided with a base assembly, a container assembly, a refrigeration assembly and a measuring assembly, the container assembly is fixedly installed on the base assembly and comprises a helium cavity, the refrigeration assembly is installed in the container assembly, and the helium cavity is communicated with the helium cavity. The refrigerating end of the refrigerating assembly is connected with the helium cavity, and the measuring assembly is used for placing a metal sample of which the RRR value is to be detected into the helium cavity; therefore, the metal sample is fixed in the helium cavity through the measuring assembly, and the temperature in the helium cavity is reduced through the refrigerating assembly, so that the temperature of helium in the helium cavity reaches a low temperature required for measuring the RRR value of the metal sample, and a low-temperature environment required for measuring the RRR value of the metal sample is manufactured; by replacing a liquid helium environment with a helium environment, the measurement cost of the RRR value can be effectively reduced.

The invention discloses a pebble-bed high-temperature gas cooled reactor core solid temperature calculation method and system, and relates to the technical field of nuclear reactor thermal calculation, and the method comprises the steps: calculating the helium temperature of a pebble-bed high-temperature gas cooled reactor primary loop according to the given core power density distribution by using a fluid temperature calculation program, and calculating the helium temperature of the pebble-bed high-temperature gas cooled reactor primary loop according to the model segment division condition; assuming an initial average temperature for each solid segment; according to the average temperature of the segments, the heat conductivity coefficients of the segments are updated according to the relational expression between the heat conductivity coefficients of various materials in the reactor and the temperature; the average temperature at the boundary of each grid is updated in three directions through the continuous conditions of the temperature and the heat flow between the adjacent grids; updating the average temperature of each segment based on a segment expansion method; and iterative solution is carried out until the whole solid temperature field converges. The method can quickly and accurately calculate the solid temperature of the high-temperature gas cooled reactor core and calculate and evaluate the operation state of the reactor core. The calculated model is expanded from two dimensions to three dimensions, and the circumferential non-uniformity of the reactor core is fully considered.

The invention relates to the technical field of low-temperature refrigeration, in particular to a rapid rewarming helium low-temperature system which comprises a cold box, a first-stage heat exchanger and a second-stage heat exchanger. The high-purity helium source is used for releasing helium to be mixed with helium at a high-pressure inlet of the final-stage heat exchanger to realize temperature mixing; and the regulating valve is arranged between the high-purity helium source and the high-pressure inlet of the final-stage heat exchanger and is used for regulating the helium flow or air pressure of the high-purity helium source entering the cold box. The high-purity helium source is mixed with helium at a high-pressure inlet of a last-stage heat exchanger in the helium low-temperature system to achieve temperature mixing, the temperature of the helium in the helium low-temperature system is increased, the heated helium passes through the last-stage heat exchanger and plays a role in heating the heat exchanger, meanwhile, the heated helium exchanges heat with helium in a low-pressure pipeline, the temperature of backflow helium is increased, and the temperature of the backflow helium is increased. The rewarming of low-temperature helium in the cold box can be realized more quickly, so that the energy consumption of a helium low-temperature system in the rewarming process can be reduced, the energy is saved, and the rewarming benefit of the helium low-temperature system is improved.

The application provides a kind of double-component propulsion system tank filling pressure control method and device, the method comprises: according to the filling propellant mass of double-component propulsion system on filling day, target orbit tank pressure and helium dissolution rate after orbit, determine helium air cushion filling pressure on filling day;According to helium air cushion filling pressure, determine helium filling mass on filling day;Obtain tank telemetry data of double-component propulsion system on the day of air supplement;According to the helium filling mass on filling day, tank telemetry data, filling propellant mass and helium dissolution rate on the day of air supplement, determine the filling helium temperature on filling day;According to the filling helium temperature on filling day, target orbit tank pressure and helium dissolution rate after orbit, determine tank air cushion adjustment pressure on the day of air supplement.The scheme can realize the quantitative control of tank target filling pressure within the effective control precision range.

A circulating refrigeration system without liquid helium consumption. The system comprises: a liquid-helium-free refrigerating machine (40); a copper shielding tube (10), one end of the copper shieldi

The invention discloses a high-pressure hydrogen, oxygen and helium filling device and method. Comprising a liquid oxygen tank group, a hydrogen tank group, a helium tank group, a liquid oxygen pressurization system, a hydrogen pressurization system, a helium pressurization system, a heat exchange system, an oxygen temperature and flow control system, a hydrogen temperature and flow control system, a helium temperature and flow control system, a filling gun isolation device, an autoclave, a remote master control system and a data pipeline. The device can simulate actual conditions of hydrogen, oxygen and helium filling in a closed space in a high-pressure environment, and research on a high-pressure closed hydrogen, oxygen and helium mixing rule and filling accuracy is carried out.