41 results about "Hydrogen measurement" patented technology

A method and a device for measuring a content of hydrogen absorbed by a metal workpiece by permeation in the form of hydrogen atoms are described. The device includes a probe with a mixing chamber accessible to an amount of hydrogen emanating from the workpiece, and communicating with an inlet port of a measurement gas. The device further includes a solid-state hydrogen concentration sensor pneumatically connected with the mixing chamber, a gas transfer means for forming a flow of a measurement gas from the inlet port to the sensor, and a processor means for processing a concentration signal of the sensor and for producing a parameter related to the interaction between the metal workpiece and the absorbed hydrogen.

The invention relates to a high-stability film hydrogen sensor and a use method thereof. The film hydrogen sensor comprises a substrate, a hydrogen measurement unit arranged on the substrate for detecting hydrogen concentration, and a temperature control unit used for controlling the temperature of the hydrogen measurement unit, wherein the hydrogen measurement unit comprises a Wheatstone bridge structure, which is composed of a plurality of hydrogen sensitive resistance elements having the same electrochemical properties and is provided with 4 bridge arms, the number of the hydrogen sensitive resistance elements on the 4 bridge arms is the same, passivated composite coatings used for isolating hydrogen are arranged on the surfaces of the hydrogen sensitive resistance elements on 2 bridge arms among the 4 bridge arms, and the 2 bridge arms are 2 opposite bridge arms. According to the high-stability film hydrogen sensor provided by the invention, the hydrogen measurement unit based on the Wheatstone bridge structure is adopted, drift caused by inherent instability of the sensor and temperature drift can mutually counteract, the sensitivity is twice as high as that of a single hydrogen sensitive resistor, and the stability of the film hydrogen sensor is perfected significantly.

The invention discloses a method for measuring a concentration of hydrogen in a nuclear power station containment vessel. The method comprises that a hydrogen measurement part plated with a palladium-silver alloy membrane is arranged in a nuclear power station containment vessel, a processor cabinet acquires a conductivity signal of the hydrogen measurement part after hydrogen absorption and release, and the processor cabinet determines a concentration of hydrogen in the nuclear power station containment vessel according the acquired conductivity signal and a signal of pressure in the nuclear power station containment vessel. The method for measuring a concentration of hydrogen in a nuclear power station containment vessel can realize safe and accurate measurement of a concentration of hydrogen in the nuclear power station containment vessel. The invention also discloses a device and system for measuring a concentration of hydrogen in a nuclear power station containment vessel.

The invention relates to a hydrogen annealing furnace tail gas treatment system which comprises a tail gas outlet pipe and a hydrogen tail gas combustion apparatus. One end of the tail gas outlet pipeis connected with a reaction tube, and the other end of the tail gas outlet pipe is connected with the hydrogen tail gas combustion apparatus; and a hydrogen measurement assembly used for measuring tail gas flow and hydrogen concentration in the tail gas outlet pipe, an oxygen flow measurement assembly used for measuring flow of oxygen injected into the hydrogen tail gas combustion apparatus andan intelligent control operation terminal used for receiving data transmitted by the hydrogen measurement assembly and controlling the oxygen flow of the oxygen flow measurement assembly according tothe received data are further included. The invention further discloses a tail gas treatment method, by measuring the hydrogen concentration and the tail gas flow, according to the hydrogen concentration and flow, an appropriate amount of oxygen is led in, and after hydrogen sufficiently and safely burns inside the combustion apparatus, the tail gas is discharged into the atmospheric environment.The hydrogen annealing furnace tail gas treatment system has the beneficial effects of being high in control accuracy, good in safety performance, high in reliable performance, simple in structure andthe like.

The invention relates to the field of technologies for measuring the content of equivalent water in cold spaces in fuel rods, in particular to a device for measuring the content of equivalent water in cold spaces in a fuel rod. A connecting piece of the device is connected with a first connector of the fuel rod by a first transparent tube, the upper end of the first connector of the fuel rod is connected with a second connector of the fuel rod by a pipeline, the fuel rod is clamped and heated by a tube electric furnace, and a upper end and a lower end of the fuel rod are nested in the first transparent tube and a second transparent tube; the second connector of the fuel rod is connected with a rod breaking apparatus by the second transparent tube, the rod breaking apparatus is sequentially connected with a sample storage machine and a reduction furnace, moisture carried by carrier gas can be reduced by the reduction furnace to obtain hydrogen, and the content of the equivalent water in the fuel rod can be measured by a gas chromatograph in hydrogen measurement modes. The device has the advantages that various components of the device can be effectively purged to adsorb water, the blank stabilization time can be shortened to the great extent, blank absolute values can be obviously reduced, interference of air moisture in operation procedures can be reduced, the pressure bearing capacity and the operational convenience of the device can be improved, and the detection efficiency can be enhanced.

The invention discloses rapid hydrogen measurement device and hydrogen measurement method for aluminium alloy, and belongs to the technical field of alloy melt purification and detection. The device comprises a vacuum pump, wherein a sealing ring is arranged between a cover board and a vacuum container; the vacuum pump is communicated with a vacuum chamber through a vacuum pipeline; and a vacuum relief valve, a vacuum degree adjusting valve and a vacuum meter are respectively arranged on the vacuum pipeline. The method comprises the following steps: turning on the vacuum pump, so that the set pressure is reached in the vacuum chamber; turning off the vacuum pump, decompressing the vacuum chamber into an atmospheric pressure state, and opening the cover board; casting to-be-measured melt into a crucible, so that the melt is solidified under an atmospheric pressure; pouring the to-be-measured melt into another crucible, putting into the vacuum chamber, covering the cover board, and turning on the vacuum pump, so that the to-be-measured melt is solidified under the set vacuum condition; and measuring the density of a reference sample solidified under the atmospheric pressure and the density of the sample solidified under the set vacuum condition by adopting a densimeter, determining the density index of the to-be-measured aluminium alloy melt, and determining the hydrogen content of the to-be-measured melt.

The invention discloses a device and a method for nondestructive measurement of hydrogen content in solid steel. The device comprises a high-temperature proton conductor, a supporting pipe and a sealing cover, wherein the outer wall of the high-temperature proton conductor is coated with a porous electrode and an auxiliary heating electrode, the inner wall is coated with a reference electrode, thereference electrode and the porous electrode are connected with a first voltmeter, the porous electrode and the solid steel to be measured are connected with a second voltmeter, and the solid steel to be measured is in compression contact with the high-temperature proton conductor. The method comprises the following steps of (1), introducing reference gas into the device for nondestructive measurement of the hydrogen content in the solid steel; (2), heating the high-temperature proton conductor to a target temperature; (3), measuring the voltage between the inner wall and the outer wall of the high-temperature proton conductor through the first voltmeter, and measuring the voltage between the outer wall of the high-temperature proton conductor and the solid steel to be measured through the second voltmeter; and (4), calculating the hydrogen content at the contact part of the high-temperature proton conductor and the solid steel to be measured. According to the device and the method, nondestructive hydrogen measurement of service steel parts can be realized, the test is accurate, the test speed is high, the steps are simple, the hydrogen content of the steel parts can be measured through point-by-point scanning, and the hydrogen gathering area can be found in time.

The invention discloses a hydrogen concentration measuring device resistant to resistant to high temperature, high pressure, high humidity and radiation and a hydrogen measuring probe. The hydrogen measuring probe comprises a probe shell, a hydrogen measuring element and a fixing assembly, wherein the probe shell is provided with a hydrogen measuring inlet covered with a filter screen, the fixingassembly is used for fixing the hydrogen measuring element in the probe shell; and the hydrogen measuring element adopts a catalytic electrochemical mode to measure the hydrogen concentration, and comprises a measuring element shell internally provided with an insulating layer, a filtration permeable membrane, a measuring electrode, a counter electrode, a reference electrode, an electrolyte layer,an oxygen storage layer and a hydrogen measuring element lead, and the oxygen storage layer adopts a metal oxygen storage and oxygen release production material and can continuously release oxygen. The hydrogen concentration measuring device adopts the hydrogen measuring probe to measure the hydrogen partial pressure. The device is suitable for hydrogen concentration measurement in high-temperature, high-pressure, high-humidity and high-radiation environments of a nuclear power plant, and is also suitable for hydrogen concentration measurement in other severe environments.

The invention relates to a method for accurately measuring the hydrogen evolution temperature range of steel materials, which is to uniformly heat the pretreated steel samples to the target temperature in an ultra-high vacuum state, the heating rate is 100-300 °C/h, and the target temperature is 800 °C ~850°C; during the uniform heating process, use a hydrogen analysis mass spectrometer to measure the change of the hydrogen evolution rate of the sample with temperature, and find out the temperature range corresponding to the fastest range of hydrogen evolution rate according to the change law of hydrogen evolution rate with temperature, which is the test The optimal hydrogen evolution temperature range of the sample. It solves the problem that the temperature range is difficult to set in the traditional hydrogen expansion process, and can solve the problem that the previous hydrogen measurement method has limitations on the sample requirements. It is a simple, fast, accurate, and environmentally friendly method for measuring the optimum temperature of hydrogen evolution, which fills the blank that cannot accurately measure the hydrogen evolution temperature range of steel materials.

The invention provides a dual-mode full-range oxygen-nitrogen-hydrogen analyzer, relates to the technical field of oxygen-nitrogen-hydrogen analyzers, solves the problems of low automation degree and inaccurate analysis of the existing oxygen-nitrogen-hydrogen analyzer, and comprises an electronic balance, an analysis host, a computer and a printer, the analysis host is connected with the computer through a power controller and a gas circuit controller, the analysis host is connected with a cooling-water machine, and the cooling-water machine is controlled through the computer. According to the method, the temperature of a pulse furnace heating device reaches 2000-3000 DEG C, nitrogen in a sample is released, and the percentage content of oxygen and the percentage content of hydrogen in the detected sample are indirectly determined through an infrared hydrogen measurement analysis pool and an infrared oxygen measurement analysis pool respectively; finally, CO2 in the gas is filtered through a CO2 treatment device, the percentage content of nitrogen is determined through a thermal conductivity detection pool, and the analysis accuracy can be effectively improved through automatic control of a gas path system.

The invention relates to a dehydrogenation method. According to the method, steel having a manganese content higher than 7% is subjected to dehydrogenation, dehydrogenation is performed in a RH vacuum refining furnace, hydrogen measurement is performed before the dehydrogenation, and the hydrogen content in a steel liquid is more than 4.0 ppm. Steps are characterized in that I: before treatment, the temperature of the steel liquid is not + 80 DEG C less than the liquidus temperature of the steel; and II the vacuum degree is 5*10<2> Pa to 10*10<2> Pa, and the treating time is not less than 18 min. According to the dehydrogenation method, the hydrogen content in the steel liquid decreases to be below 2.5 ppm, and the manganese loss rate after vacuum treatment is less than 2%. The method is capable of reducing the manganese loss in the vacuum treatment at the same time of reducing the hydrogen content in the steel, thus avoiding casting blank adhesion, steel leakage and longitudinal crack generation due to high hydrogen content in continuous casting.

The invention mainly belongs to the field of electrolysis of metal titanium through molten salt, and particularly relates to a method for measuring the concentration of low-valent titanium ions. The method is used for measuring the concentrations of titanium ions in various valence states in a mixed electrolyte through a molten salt electrolysis process, and the valence state of the titanium ions in the mixed electrolyte is Ti<n+>(n=2, 3, 4). The method comprises the following steps: (1) measuring the concentration W1 of Ti<2+> in the mixed electrolyte through a hydrogen measurement method; (2) measuring the concentration W2 in the mixed electrolyte through ammonium ferric sulfate titrimetry based on a solution subjected to hydrogen measurement, wherein the concentration of Ti<3+> is equal to a value obtained by subtracting W1 from W2; and (3) measuring the concentration of Ti<4+> through spectrophotometry. The method can be used for measuring the concentrations of the low-valent titanium ions in various valence states through the molten salt electrolysis process, so as to obtain a relatively stable electrolyte system and guide metal electrolysis preparation or metal titanium electrolysis and refining industrial production.

The invention discloses a pH measurement system for waste gas from a smelter, which comprises a light bulb arranged in the street lamp body, and is characterized in that the light bulb is arranged at the bottom of the lampshade of the street lamp body, and the lampshade is closest to the ground The surface of the side is provided with a rainwater collection hole, and the surface is also provided with a rain collector. The rainwater collection hole is connected to a pipeline. One end of the pipeline is connected to a rainwater collection hole, and the other end is connected to an acid rain detection device. The device uploads the detected rainwater pH value to the server through the wireless transmission device. When it rains, the rainwater enters the lampshade in the wall street lamp, collects the rainwater on the inner wall of the lampshade through the rain collector, and enters the inside of the pipe through the rainwater collection hole, and the pipe is connected to the acid rain detection equipment in the wall street lamp to measure the pH of the rainwater Value detection, so that the acid rain detection equipment is built in, which can prevent the acid rain detection equipment from being exposed to the external environment for a long time, and its detection accuracy will be affected.

The invention relates to a hydrogen partial pressure rapid detection method for an aluminum alloy melt dynamic respiration method hydrogen measurement device, which belongs to the field of casting andmetallurgy, and solves the problems of complex structure, long detection time, inconvenient application and high manufacturing and use cost of the previous dynamic respiration method hydrogen measurement device. A melt hydrogen partial pressure detection system is constructed, no-load operation is carried out to determine characteristic parameters of a variable-capacity vacuum unit, an electric push rod drives a first cylinder and a second cylinder to increase the capacity to extract the vacuum degree required by hydrogen measurement by a dynamic respiration method, the gas pressure intensityin the variable-volume vacuum chamber is compared with the sum of the iterative computation theoretical pressure intensity and the vacuum chamber characteristic parameters so as to judge whether diffusion is finished or not and solve the melt hydrogen partial pressure, negative pressure required by the dynamic respiration method hydrogen measurement device can be provided through air cylinder volume changing, aluminum alloy melt hydrogen partial pressure detection is completed while capacity increasing and vacuum pumping are conducted in the variable-volume vacuum chamber, and rapid hydrogenpartial pressure detection is achieved under the condition that the vacuum pump and a hydrogen cylinder are not used.

The invention discloses a hydrogen measured value correction method based on a hydrogen sensor. The method comprises the following steps: completing calibration of the hydrogen sensor under a fixed absolute pressure P0; recording an environment absolute pressure value P0 when the hydrogen sensor is calibrated; and assuming that X is a gas to be measured, measuring the gas to be measured, and recording an environment absolute pressure value Px and a concentration value under the pressure during measurement. The invention provides a simple and reliable environmental pressure correction method which is characterized in that the hydrogen concentration usually changes along with the pressure change of a measurement environment in the detection process of a hydrogen sensor, and in order to ensure that an accurate hydrogen concentration value can be measured through the hydrogen sensor under different environmental pressures, the invention provides the simple and reliable environmental pressure correction method.

Provided is a hydrogen measurement sensor capable of monitoring a content of hydrogen within molten metal in real-time using an aluminum or magnesium alloy casting method, and, more particularly, a hydrogen measurement sensor having a junction structure of a solid oxygen ion conductor and a solid hydrogen ion conductor in molten metal capable of measuring a content of hydrogen within aluminum-magnesium alloy-molten metal using a new method which generates a fixed concentration of oxygen gas from a solid reference material at a high temperature by replacing a reference material of a standard gas method which is difficult to handle with a solid reference material or external air which is easy to handle or has the same effect as that of the gas reference material by using a feature in which the external air contains a predetermined pressure (0.21 atm) of oxygen.

The invention provides a high-temperature protection device for a hydrogen measuring instrument, which is a flip type box body, and when the hydrogen measuring instrument is used for measuring the hydrogen content of molten aluminum, an operator puts the hydrogen measuring instrument into the high-temperature protection device for the hydrogen measuring instrument; in order not to influence the normal use of the hydrogen measuring probe, a probe hole is reserved at the turnover cover of the box body and is used by the hydrogen measuring probe; in order to clearly see parameters and display of the hydrogen measuring instrument, the flip cover of the high-temperature protection device of the hydrogen measuring instrument needs to be made of a transparent material; the high-temperature protection device for the hydrogen measuring instrument is used beside high-temperature molten aluminum, and the used material is required to have good corrosion resistance and heat resistance, so that 304 stainless steel is selected as the shell material of the high-temperature protection device for the hydrogen measuring instrument; in order to better isolate the high temperature transmitted by the molten aluminum, a layer of heat insulation cotton needs to be laid on the side, close to the molten aluminum, of the high-temperature protection device of the hydrogen meter; in order to prevent heat from gathering in the high-temperature protection device of the hydrogen measuring instrument, a compressed air inlet and an air outlet are formed in the two sides of the high-temperature protection device of the hydrogen measuring instrument respectively, compressed air is communicated for purging and cooling during hydrogen measurement, and the whole device has a very targeted protection effect.

The invention discloses a self-adaptive interference value suppression system of a thermal conductivity type hydrogen online analyzer, which is characterized in that an electronic system with a simple structure is designed by utilizing low-cost electronic components, 4-20mA signals output by an analysis table are processed, and in the occasion of coexistence of hydrogen, carbon dioxide and methane, a processor senses the content of methane and carbon dioxide in real time, and the interference value of the thermal conductivity type hydrogen online analyzer is suppressed. The interference value of the content of the carbon dioxide and the methane under the current content on the hydrogen measurement value is obtained through calculation, and the interference value is inhibited. The method is a self-adaptive interference value suppression scheme, and compared with a method for setting a fixed interference value in an instrument, the method can also accurately measure the hydrogen content when the content of methane and the content of carbon dioxide change. Compared with a scheme of eliminating an existing infrared analyzer and purchasing an industrial chromatogram, the scheme provided by the invention has the advantages that the cost is low, only one thousandth of the total cost of replacing the industrial chromatogram is realized, the performance is reliable, and the measurement result can completely meet the requirements of a production process.

The invention discloses a sampling device for gas concentration measurement. The device comprises a pressure container, a nitrogen cylinder, a hydrogen cylinder, a hydrogen measuring system, a chromatograph and a deionized water tank, one side of the pressure container is communicated with the nitrogen cylinder, and one side of the pressure container is also communicated with the hydrogen cylinder; and four sampling probes are arranged in the pressure container, each sampling probe comprises a sampling tube, a joint, a sampling head and an anti-spray cover, the anti-spray cover is connected tothe surface of the sampling tube in a sleeving manner, and the bottom end of the sampling tube is fixedly connected with the top end of the joint. Concentration parameters of hydrogen in sampled gasare detected through the hydrogen measuring system, meanwhile, the hydrogen concentration in the sampled gas is detected through the chromatograph, and the precision of the sampling device is obtainedaccording to comparison results of four pairs of hydrogen concentrations in the hydrogen measuring system and the chromatograph.