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4545results about "Weighing by removing component" patented technology

Experimental device and experimental method for transformer oilpaper insulating thermal ageing

The invention belongs to the technical field of transformer ageing detection. An experimental device for transformer oilpaper insulating thermal ageing consists of an outer cavity, an inner cavity and a measurement-display system, wherein the inner cavity consist of a main cavity body, an oil conservator on the main cavity body, an electrode-sample test frame inside the main cavity body and a minor cavity body; the minor cavity body and the main cavity body are connected through a pipeline; a valve is arranged on the pipeline; and an air exhaust port and an oil injection port are arranged on the main cavity body. An experimental method for transformer oilpaper insulating thermal ageing comprises the following steps: 1) performing insulating-paperboard vacuum dry sample treatment; 2) placing sample and injecting oil; 3) installing the minor cavity body; 4) injecting transformer oil; 5) accelerating thermal ageing experiment; 6) measuring dielectric parameters on line to acquire related experiment data; and 7) analyzing off-line sample physicochemical parameters to acquire experiment data. The invention can measure the dielectric parameters of the samples on line in real time, regularly samples on the premise of not changing the prior test environment of the samples, and can research thermal ageing laws of oilpaper insulating materials of large-scale power transformers.
Owner:XI AN JIAOTONG UNIV

Thermo-mechanical-environmental coupling effect testing device and application from room temperature to ultrahigh temperature

The invention relates to the field of test of mechanical properties of materials and in particular relates to a thermo-mechanical-environmental coupling effect testing device and application from room temperature to ultrahigh temperature. The device comprises an electronic universal testing machine, a loading control system, a power supply control system, an induction heater, a strain measurement system, a sample clamp, a temperature measuring system, a pressure control system, a display and analysis system and a vacuum system, wherein a vacuum cavity in the electronic universal testing machine is in a fully water-cooled design, and various functional windows, such as a sensor connector of the clamp and the electronic universal testing machine, an infrared or thermocouple temperature measuring opening of the temperature measuring system, a pressure control opening of the pressure control system, an induction power supply introduction opening of the power supply control system, an extensometer introduction opening of the strain measurement system and a connector of the vacuum system and the vacuum cavity, are reserved in different parts of the vacuum cavity. The device disclosed by the invention can quantitatively research the thermo-mechanical-environmental coupling effect and has the advantages of diversified tested mechanical property parameters, high sample heating and cooling speed and the like.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Judging method of solid insulating and aging degrees of transformer

The invention relates to a judging method of the solid insulating and aging degrees of a transformer, which sequentially comprises the following steps of: 1. preparing a gradient concentration standard solution of a furfural solution, carrying out liquid chromatographic detection, and making a standard curve I; 2. taking insulating paper samples in an actual electric network transformer, carrying out the liquid chromatographic detection, and obtaining the furfural concentration in each sample according to the standard curve I; 3. respectively measuring the water content H thereof by adopting the insulating paper samples in the step 2, computing the dry paper concentration C, additionally sampling, measuring the specific viscosity thereof, and computing the polymerization degree of the insulating paper samples according to a Martin empirical formula; 4. making a standard curve II by using the polymerization degree of insulating paper as an abscissa and using the logarithm of the furfural concentration as an ordinate; and 5. measuring the furfural concentration for an unknown sample, obtaining the polymerization degree of the insulating paper according to the standard curve II in the step 4, and judging the solid insulating and aging degrees of the transformer according to an IEC60450 standard. The method only needs to extract proper oil samples, has simple operation, does not need power failure, and is a quite practical method.
Owner:JIYUAN POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER

Detection method and device of coke reactivity and post-reaction heat-treatability

The invention discloses a detection method and device of the reactivity and post-reaction heat-treatability of coke and the method and device are used to detect the gasifying starting temperature, reactivity and post-reaction heat-treatability of coke. The detection method adopts an electric furnace as a heating furnace and uses an electronic balance for to weight. The reactivity detection method is performed on the condition of first heating and second keeping temperature constant, the electronic balance is used to measure the mass loss of a coke sample; and when the coke weight-loss ratio equals a specified value, the measurement weight-loss ratio (time) minus one is used as the reactivity index; the detection method of the post-reaction heat-treatability of coke is that when the coke weight-loss ratio equals the specified value, coke is continuously heated under the protection of inert gas, and the coke weight-loss ratio is used as the post-reaction heat-treatability index during the detection period of heat treatment. The detection device comprises the electronic balance, a reaction tube support, a reaction tube, the heating furnace and a heating furnace elevating mechanism. The method and device of the invention can provide 1500-1600 DEG C of detection temperature and the coke thermal characterization in the bosh (before an air port) and the hearth can be displayed.
Owner:山西今日太工煤焦技术研究有限公司

Controllable fast-heating up thermobalance reacting furnace

The invention discloses a controllable fast-heating up thermobalance reacting furnace, comprising a high temperature furnace reaction unit, a balance weighting device, an air control device and an electronic control unit, wherein the high temperature furnace reaction unit uses two-section heating, the temperature of the furnace body is set, collected and transmitted by the electronic control device; and when in an experiment, the air control device adjusts the air atmosphere in the high temperature furnace reaction unit, a sample is rapidly placed in a constant temperature zone of the high temperature furnace reaction unit to realize rapid heating up by a balance lifting mechanism in the balance weighting device, and mass change of the sample is converted into electronic signals in real time to be transmitted to the electronic control device for continuous monitoring and storing. The invention has the characteristics of large controllable range of heating rate, large range of test sample amount and controllable reaction atmosphere, thus meeting the requirement of the thermobalance test research under various reaction conditions with different sample amounts and heating rate; and common measurement equipment can perform on-line air component analysis, thus being favor of disclosing the action mechanism and control strategy in the reaction process.
Owner:HUAZHONG UNIV OF SCI & TECH

Performance testing equipment for humidifying function material and testing method

The invention discloses performance testing equipment for a humidifying function material and a testing method. The equipment disclosed by the invention comprises a relative humidity control part, a weighing part and a temperature and humidity monitoring part, wherein the relative humidity control part is a mechanical constant temperature cabinet system, a humidity change equipment system or a saturated saline water solution system and is provided with a closed space with adjustable temperature and humidity; a temperature probe and a humidity probe of the weighing part and the temperature andhumidity monitoring part are arranged in the closed space; the weighing part is an electronic balance; and the electronic balance, the temperature probe and the humidity probe are connected with a computer which is arranged outside the closed space. By means of different temperature and humidity control modes, the humidity absorption and release performances of the material are detected through ahumidity reaction method; the computer records the data of a detection sample which is weighed by the electronic balance in real time; and the humidity absorption and release capabilities of the sample are obtained by computing. The invention can accurately detect the humidifying performance of the material, and a testing result has good stability.
Owner:CHINA BUILDING MATERIALS ACAD

Determination device and method of constraint irreducible water saturation in reservoir rock core

The invention discloses a determination device and method of constraint irreducible water saturation in a reservoir rock core. The device mainly comprises a high-pressure nitrogen source, a humidifier, a rock core holding device, an oil-water displacement pump, a loop pressure pump, a return pressure control pump, a gas metering instrument and a liquid metering instrument, wherein the rock core clamping device is arranged in a constant-temperature box; the high-pressure nitrogen source is connected with the inlet end of the rock core clamping device through the humidifier; the oil-water displacement pump is also connected with the inlet end of the rock core clamping device through an oil-water displacement control valve; the loop pressure pump is connectd with the rock core clamping device through a loop pressure control valve, and applies confining pressure to the rock core; and the outlet end of the rock core clamping device is connected with the return pressure control pump, and is also connected with the gas metering instrument and the liquid metering instrument respectively. The device is reliable in principle, is reasonable in structure, and is simple and convenient to operate, is utilized for determining the constraint irreducible water saturation in the reservoir rock core, can achieve the highest pressure of 70Mpa and the highest temperature of 150 DEG C, and remedies the defects of an existing gas reservoir log analysis and gas well production dynamic analysis method as well as the technique application.
Owner:SOUTHWEST PETROLEUM UNIV +1

Microwave moisture analyzer: apparatus and method

A toploading weighing instrumentality which determines loss on drying by a cylindrical microwave. The cylindrical cavity of the microwave includes a power supply, a magnetron, a power module operatively coupled between said power supply and said magnetron for driving said magnetron, a wave guide communicating with the magnetron and with a microwave containment chamber for delivering energy thereto, at least one microwave energy sensor for sensing microwave energy or magnetic and/or electric field strength within the chamber for controlling, inter alia, the loss on drying process of the sample being assayed and determining when the drying process is complete. A precision electronic balance is operatively disposed within the microwave chamber for allowing a specimen being assayed to be weighed. In addition, a ventilation chamber is provided for venting moisture from the microwave chamber. A processing unit and associated memory allows means for data acquisition, processing and storage of data from the power module driving the magnetron, the microwave energy sensor(s) for sensing magnetic and/or electric fields and the electronic balance for weighing the initial and final weights of the specimen for loss on drying moisture analysis. Both signaling the removal of microwave energy in the chamber.
Owner:DENVER INSTR

Method for measuring contents of silicon-calcium elements in silicon-calcium alloy

The invention relates to a method for measuring the contents of silicon-calcium elements in a silicon-calcium alloy. After a sample is grinded and passes through an analysis sieve with 180-200 meshes, the method provided by the invention is characterized in that the sample is fused at high temperature by adopting an alkali fusion method; the fusion course comprises the steps of: weighing and adding the sample and sodium hydroxide solid to a nickel crucible; after adding the mixture to a high temperature furnace to be heated, taking out and cooling; washing the fused analysis sample to an evaporation dish by utilizing deionized water and hydrochloric acid; drying and adding the hydrochloric acid to be acidized; adding warm water to be stirred until soluble salts are completely dissolved; instantly filtering by utilizing quantitative filter paper; enabling the filtrate to be constant volume in a volumetric flask to prepare a sample analysis solution; and maintaining the precipitations to be analysis components. The method for respectively measuring the contents of silicon and calcium provided by the invention comprises the following steps: measuring the content of the silicon with precipitation and filter paper by utilizing a weight analysis method after ashing, firing, cooling and weighing; and measuring the content of the calcium with the sample analysis solution by utilizing a volumetric method. The method provided by the invention has the advantages of once sample weighing, multi-element continuous measurement, time and labor saving, energy conservation, consumption reduction and the like and can reduce the damage of hydrofluoric acid to human bodies and environments.
Owner:TAIYUAN HEAVY IND

Standard distribution sample for detecting comprehensive performance of environmental chamber and detection method thereof

The invention relates to a standard distribution sample for detecting comprehensive performance of an environmental chamber and a detection method thereof and belongs to the field of indoor environment detection. The sample comprises a polytetrafluoroethylene cylindrical container of which the upper end is opened, organic volatile matter VOC liquid accommodated in the container, a barrier layer arranged on the upper end face of the cylindrical container and a sealing device fixing the barrier layer. The method comprises the following steps of: establishing a model; measuring the ventilation rate of the environmental chamber to be detected; placing the sample in the environmental chamber to be detected, placing the sample on an electronic balance, and recording the mass change of the standard distribution sample in real time; when the environmental chamber is in a sealed state, distributing the VOC liquid in the cylindrical container, calculating a distribution rate with the model according to the mass change, and calculating VOC concentration in the environmental chamber; acquiring the VOC concentration at an outlet of the environmental chamber in real time; and comparing the measured value and the calculated value of the VOC concentration to evaluate the comprehensive performance of the environmental chamber. The standard distribution sample and the detection method for the standard distribution sample have the advantages of simpleness and convenience, easy operation and relatively high precision and reliability.
Owner:TSINGHUA UNIV

Test method of sulphate content of desulfurization gypsum

The invention provides a test method of the sulphate content of desulfurization gypsum, comprising the following steps: 3-5 grams of gypsum samples are taken to be heated and dried for 30-60 minutes in a baking oven with the temperature of 42-48 DEG C and then placed into a drier to be cooled to room temperature and weighed by a 1/10000 level balance, the gypsum samples are repeatedly heated and weighed till the gypsum samples have constant weight, and the weight W (g) of the gypsum samples is recorded; the gypsum samples are placed back to the baking oven to be heated and dried for 30-60 minutes under the temperature of 350-370 DEG C and then placed into the drier to be cooled to the room temperature and weighed by the 1/10000 level balance, the gypsum samples are repeatedly heated and weighed till the gypsum samples have constant weight, and the weight W1 (g) of the gypsum samples is recorded; the computation of the crystallization water content of the gypsum samples is as follows: the crystallization water content X(%)=(W-W1)*100/W, and the computation of the sulphate content of the gypsum samples is as follows: the sulphate content is indicated by calcium sulphate dehydrate content, CaSO4.2H2O(%)=X*100/20.9275. The method is simple, convenient and fast; and in addition, compared with the prior art, the invention greatly enhances the analysis speed, simplifies the analysis steps and decreases the experimental apparatus.
Owner:HEBEI ELECTRIC POWER RES INST

Experimental device and representation method of multiphase medium high-temperature corrosion rate

The invention discloses an experimental device and a representation method of multiphase medium high-temperature corrosion rate. The experimental device comprises an air distribution device, a heating device and a tail gas treatment device which are communicated sequentially, wherein the air distribution device comprises a mixing device and a plurality of air bottles which are communicated with the mixing device; a quality flow meter connected with a computer is arranged among the mixing device and the air bottles; and the heating device comprises a heating furnace and a quartz tube reactor in the heating furnace. The representation method comprises the following steps: carrying out a gas phase or gas-liquid phase high-temperature corrosion experiment on a test sample according to the experiment requirement, thereby obtaining the decrement of the weights of the test sample before and after being corroded, and then converting the decrement into the thickness of the corroded test sample as the generation thickness of the corrosion layer during the test period of the test sample; and carrying out line energy spectrum line scanning experiment on the corroded test sample, thereby obtaining the maximal migration depth of a corrosive element in the thickness of the test sample, and finally calculating the high-temperature corrosion rate. By adopting the experiment device and the representation method provided by the invention, the high-temperature corrosion rate and the corrosion degree of a corrosive factor on the test sample are truly reflected from the macroscopic and microcosmic views.
Owner:XI AN JIAOTONG UNIV

Method for evaluating erosion rate of sand control pipe and its special-purpose apparatus

The invention relates to a method for evaluating erosion rate of a sand control pipe and its special-purpose apparatus, which is characterized in that the on-site screen casings are used for processing to screen casing sheets for experiments. According to the invention, change of sand control pipe precision can be evaluated by a laser granularity analysis on sand from different periods of experiment process, erosion rate of the screen casing under specific reservoir condition and production condition can be evaluated according to the mass change of the screen casing sheet before and after the experiment, and finally the erosion rate and the usage life of the screen casing can be predicted. For solving the problems, a technical scheme is characterized in that the special-purpose apparatus is a whole set of fluid circulation apparatus, which comprises a circulation solution storage pot 1, a high pressure pump 2, a pressure gage 3, a flow monitor device 4, a safety exhaust valve 6, a pressure transducer 7, an enclosed autoclave body 8, an oil-sand separator 9, and a data acquisition system 10. According to the special-purpose apparatus, an erosion stand 14, a cleaning nozzle 22 and a sand washing nozzle 15 are arranged in the enclosed autoclave body 8.
Owner:CHINA UNIV OF PETROLEUM (BEIJING) +1

Hierarchical collection device of suspended matters of natural water body, and collection method of hierarchical collection device

The invention discloses a hierarchical collection device of suspended matters of a natural water body, and a collection method of the hierarchical collection device. The collection device comprises a filtering combination suite, a control box, a submersible pump and a water pipe, wherein the filtering combination suite further comprises a water inlet element, filtering elements and a water outlet element, and a plurality of filtering elements are overlapped together and are arranged between the water inlet element and the water outlet element. According to the hierarchical collection device, the plurality of filtering elements are overlapped together, the apertures of the filtering elements are gradually reduced from top to bottom, the suspended matters in different particle sizes are separated in a layer-by-layer manner, and the suspended matters in different particle sizes can be separated at one time, so that the operation is simple and quick, and precision is improved. The collection device is easy to use during field sampling, depth and flow instruments can be used for quantitative sampling of the natural water bodies in different depths, the suspended matters are separated in place, and the original state of the suspended matters is ensured; and the difficulty in separation of bio-particles in a sedimentation method is overcome; and the collection device has the advantages of large flux, time saving and very low cost.
Owner:PEKING UNIV
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