32 results about "Hydrogen analysis" patented technology

A sampling analysis system for measuring the concentration of hydrogen in the containment vessel, comprising: a sampling pipeline, a transmission pipeline, a water vapor analysis sensor, a gas pretreatment unit, a hydrogen analysis sensor, a booster pump, a microprocessor, and a display unit; The gas in the containment is extracted by the sampling pipeline with thermal insulation treatment function, and the gas is processed to normal temperature and pressure by the pretreatment unit after passing through the water vapor analysis sensor, and the hydrogen volume in the pretreated gas is measured by the hydrogen analysis sensor Concentration, the microprocessor determines the current hydrogen volume concentration in the containment according to the measurement results of the sensor and outputs and displays it. It adapts to the use requirements of common gas analysis sensors and eliminates the influence of water vapor on the gas extraction measurement method in the containment by preprocessing the measured gas and combining with the preset algorithm program in the microprocessor. It is especially suitable for accurate measurement of the volume concentration of hydrogen or other explosive gas components in the containment under accident conditions of nuclear power plants.

The invention relates to a full-degassing-lighter-hydrocarbon automatic sample introducing system used for lighter hydrogen analysis. The full-degassing-lighter-hydrocarbon automatic sample introducing system comprises a heating part, a timing control part, a temperature control part, a heat distilling degasser, an automatic sample introducing system, a power supply and an R232 circuit which are assembled in a casing, wherein the timing control part, the temperature control part and the heating part are connected together. A mud slurry pot of the heat distilling degasser is arranged on the heating part, the heat distilling degasser and the automatic sample introducing system are connected with the A end of a T-shaped electromagnetic valve of the automatic sample introducing system by the sample gas outlet of the heat distilling degasser, and the automatic sample introducing system is connected with the R232 circuit. The invention has the advantages of full automation, and no boiling phenomenon if the mud slurry is heated; the danger is reduced, the pollution of the chromatogram post caused by the separation of heavy hydrocarbon is avoided, quantitative tubes are used for sample introduction, the consistency of the sample introducing quantity at each time is guaranteed, and the analyzing performance of the instrument is improved.

The invention relates to a method for preparing a PCL-PDMS-PCL stabilizing agent by hydrogen chloride/ether solution catalysis. The method comprises the following steps: initiating epsilon-caprolactone (epsilon-CL) ring opening polymerization by adopting hydroxypropyl terminated polydimethylsiloxane (HTPDMS) as an initiator and a hydrogen chloride/ether solution (HCL.Et20) as a catalyst to prepare a tri-block stabilizing agent polycaprolactone-b-polydimethylsiloxane-b-polycaprolactone (PCL-PDMS-PCL). Infrared spectroscopy and nuclear magnetic resonance hydrogen analysis indicate that the synthesized molecules are accordant with the structure of a target molecule. The optimized reacting conditions include a reacting temperature of 25 DEG C, a reacting time of 4 hours and a molar ratio of HCL.Et2O to HTPDMS being 2:1. The method can be used for solving a conventional problem caused by adopting a metal catalyst since the hydrogen chloride/ether solution is adopted as the catalyst, the preparation environment is environment-friendly, the reacting time is remarkably shortened, and the prepared tri-block stabilizing agent can be applied to a dispersing agent of biopharmaceutical polymerization in supercritical fluids.

The invention discloses a method for preparing p-acetoxy-benzoic acid. The method comprises the following steps of: reacting p-hydroxybenzoic acid as a raw material, acetic anhydride as an acylating agent and pyridine as a catalyst in a condition of 1.2-1.5 times of the excessive acetic anhydride: firstly, adding a certain amount of the p-hydroxybenzoic acid and the acetic anhydride into a reactor; dropwise adding the pyridine while stirring and raising the temperature to 80-85 DEG C; controlling the dropwise adding speed, wherein preferentially the temperature raising speed of a reactant is not beyond 10 DEG C; keeping the reaction temperature and continuously stirring for 2-3 h after adding the p-hydroxybenzoic acid and the pyridine and completely converting the reactant into crystals; and finally, repetitively washing the cooled reactant till the pH value of filtrate is 3-4 so as to obtain a crude product of acetoxy-benzoic acid. Both purities of a liquid chromatogram analysis result and a nuclear magnetic resonance hydrogen analysis result of the p-acetoxy-benzoic acid are more than 99.5%. According to the method disclosed by the invention, the conversion rate of the p-acetoxy-benzoic acid is more than 96%; furthermore, the content of by-products is low; and the difficultly for further refining and purifying the product is greatly reduced.

The invention relates to a carrier gas purification filter pipe for an oxygen-nitrogen-hydrogen analyzer, a furnace head and an oxygen-nitrogen-hydrogen analyzer, and belongs to the technical field of oxygen-nitrogen-hydrogen analysis. The carrier gas purification filter pipe for the oxygen-nitrogen-hydrogen analyzer comprises a filter pipe and a filtering material arranged in the filter pipe and used for filtering gas, as well as a linear displacement detector used for detecting the displacement of the filtering material. According to the carrier gas purification filter pipe for the oxygen-nitrogen-hydrogen analyzer, the linear displacement detector is used for precisely displaying the amount of graphite powder adsorbed by the filtering material in the filter pipe, and the filtering material can be timely replaced, so that the precision of an analysis result is improved, and the analysis cost is reduced.

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 discloses a preparation method of a graphite material for an oxygen-nitrogen-hydrogen analysis instrument. The preparation method comprises the following steps: 1) preparing a paste material; 2) extruding into a green body bar; 3) carbonizing to prepare a carbonized bar; and 4) purifying to obtain the high-purity graphite material for the oxygen-nitrogen-hydrogen analysis instrument.The low-nitrogen natural microcrystalline graphite is used as a main raw material so that compared with the existing production technology which generally adopts calcined petroleum coke and calcinedpitch coke as raw materials, the nitrogen content of the raw materials is remarkably reduced, and the production of the graphite material meeting the requirements of oxygen-nitrogen-hydrogen analysisinstruments is facilitated. The natural microcrystalline graphite has the advantages of high graphitization degree, good lubricity and the like so that the natural microcrystalline graphite is used asa raw material to be beneficial to reducing the resistance among materials during forming, and a product with a fine and compact structure and good uniformity is obtained; in the carbonization process, a specific heating system is adopted so that the product can be effectively prevented from cracking, the carbon residue rate of the binder is improved, and the density and strength of the product are further improved.

The invention relates to the field of oil-rich coal resource evaluation and oil product extraction, in particular to an analysis method of oil-rich coal. The analysis method comprises the following steps: firstly, carrying out industrial analysis, total sulfur analysis, hydrocarbon analysis, ash component analysis, nitrogen analysis, Gray-King low-temperature dry distillation analysis, vitrinite reflectivity analysis, maceral classification analysis, scanning electron microscope analysis, energy spectrum quantitative analysis and X-ray diffraction total rock analysis on the oil-rich coal, and then carrying out pyrolysis treatment. The pyrolysis treatment conditions are as follows: heating is started from room temperature, the temperature is raised to 550-650 DEG C at the rate of 15 +/-0.5 DEG C/min, and the temperature is kept for 25-35 minutes. The pyrolysis treatment conditions of the oil-rich coal are determined by analyzing the oil-rich coal, and high-quality pyrolysis coke, pyrolysis liquid and pyrolysis gas can be obtained by performing pyrolysis treatment on the oil-rich coal under the conditions.

The invention provides a total hydrocarbon analysis control system and control method for oxygen generation. The control system is composed of an oxygen generator system, an analysis system and a DSCsystem. The oxygen generator system consists of a first air separation unit and a second air separation unit, a third air separation unit and a liquid oxygen tank. The analysis system consists of a first analysis channel, a second analysis channel, a third analysis channel, and a hot standby analysis channel. And the DSC system includes a control unit. Besides, the control method comprises: S1, injecting combustion air; S2, injecting combustion hydrogen; S3, injecting total hydrocarbon sample gas; S4, operating a total hydrocarbon analysis meter; and S5, analyzing and controlling a total hydrocarbon content of the oxygen generator system. Compared with the prior art, the control system and control method have the following beneficial effects: when any air separation analyzer or other unitcomponent has a fault problem or is damaged or the analyzer is in an off-line state because of checking and maintenance, the total hydrocarbon content of the corresponding air separation unit can be monitored continuously, so that an explosion risk caused by excessive accumulation of total hydrocarbons in air separation is avoided.

The invention relates to a method for analyzing trace hydrogen sulfide in coal gas, which comprises the following steps: 1) preparing an absorption liquid: measuring the H2S concentration of the absorption liquid which is a mixed solution of NaOH and KOH, and putting the absorption liquid into a reaction tank at a position where the liquid level of the absorption liquid is not lower than half of the height of the tank body; (2) sequentially connecting a coal gas inlet, a sucking pump I, a flow meter, a gas storage bag I, a sucking pump II, an absorber, a gas storage bag II, a sucking pump III and a gas storage bag I through gas conveying pipes; the absorber, the liquid volume measuring instrument and the liquid component analysis equipment are sequentially connected through a liquid conveying pipe; 3) carrying out online absorption on hydrogen cyanide in the coal gas; 4) completely discharging the absorption liquid out of the absorber, and measuring the volume of the absorption liquid and the concentration of H2S; and 5) calculating the H2S concentration. The method has the advantages that the to-be-detected gas is circulated for multiple times, the hydrogen sulfide in the coal gas is completely absorbed, and the method is extremely high in accuracy, low in cost and high in efficiency.

A test time for measuring hydrogen diffusion in a steel material is improved. The reproducibility of a position where hydrogen exists in the steel material is improved. A control terminal controls a solution supply/discharge control device, a gas supply control device, a first potentiostat/galvanostat, and a second potentiostat/galvanostat on the basis of a predefined procedure, so that a plurality of processing steps, which are performed for analyzing hydrogen diffused from the inside to the surface of a steel material to be measured, are performed continuously. Further, the processing of inactivating the surface of the steel material to be measured is performed before the main processing using a metal ion replacement method, or an inert gas is injected into the solution during the main processing.

A high-strength steel member having a predetermined chemical composition, having a tensile strength of 1,000 MPa or higher, containing 0.10% or more of, in terms of percent (%) by area, at least one Ti precipitate that has an average size of from 30 to 200 nm in terms of an average equivalent circle diameter and is selected from the group consisting of a Ti carbide, a Ti nitride, and a composite compound thereof, at a location of 1 mm in depth from a surface of the steel member, and containing 0.5 ppm by mass or more of non-diffusible hydrogen that is released in a temperature range of from 400 to 800° C. in a thermal desorption hydrogen analysis.

The invention discloses a reactor primary loop dissolved hydrogen content determination method. The method comprises the following steps: S1, respectively installing a flowmeter and a pressure gauge on an inlet and an outlet of a flow cell of a portable hydrogen analyzer, and calibrating; S2, connecting a portable hydrogen analyzer into a primary loop of the reactor, and connecting a gas supply steel head of the portable hydrogen analyzer with a nitrogen supply system; S3, enabling the coolant of the reactor primary loop to enter the flow cell through the inlet and return to the reactor primary loop through the outlet; S4, determining the coolant by the portable hydrogen analyzer to obtain the total content of hydrogen and helium in the coolant; and S5, subtracting the content of helium in the coolant, which is measured by a gas-liquid phase separator in advance, from the total content of hydrogen and helium to obtain the content of hydrogen in the coolant. According to the invention, online continuous measurement of the dissolved hydrogen content in the reactor primary loop coolant is realized, the accuracy, stability and sensitivity of dissolved hydrogen content measurement are improved, the radiation dose of personnel during dissolved hydrogen analysis is reduced, and the working efficiency is improved.

The invention discloses an online circulating hydrogen analysis detector, which comprises a detector, a sampling port formed in a process pipeline, a sampling channel communicated with the sampling port, a control valve arranged on the sampling channel, a hydrocarbon remover, a purifier and an analysis membrane communicated with the hydrocarbon remover, wherein the hydrocarbon remover and the purifier are respectively communicated with the sampling channel and are arranged in parallel, the analysis membrane is communicated with the gas inlet pipeline of the detector, the purifier is communicated with a switching valve, the switching valve is connected with a hydrogen generator, a calibration gas inlet pipeline, a first reference gas pipeline, a second reference gas pipeline and a tail gasblowing pipeline, the tail gas blowing pipeline is communicated with the gas inlet pipeline of the detector, and the detector is provided with a first reference gas inlet communicated with the first reference gas pipeline and a second reference gas inlet communicated with the second reference gas pipeline. The online circulating hydrogen analysis detector is strong in functionality and high in sensitivity.