29results about "Material crystallisation" patented technology

The invention relates to the technical field of molten salt treatment, and discloses a molten salt recovery system based on a steel belt cooling granulator. The system comprises a molten salt physical property monitoring module, a viscosity modeling module, a cooling optimization module, a partition temperature control module, a phase change monitoring module, a dynamic adjustment module, a particle size analysis module, a quality grading module, a pneumatic conveying module and a waste heat recovery module. The progressive crystallization control of the molten salt particles is realized; a heat pipe type heat exchanger and an organic Rankine cycle system are integrated at the waste heat recovery end, so that comprehensive energy consumption is reduced; the environment regulation and control end monitors the workshop temperature and humidity in real time based on a dew point calculation model, and the long-term stability of hygroscopic fused salt particles is guaranteed. According to the method, four technical bottlenecks of out-of-control crystallization, energy waste, classification loss and environmental interference in fused salt recovery are overcome, and low-cost, high-purity and zero-waste fused salt resource recycling is realized.

The present application provides a urine processing method and a urine testing system. The method comprises processing urine to obtain urinary sediment and supernatant, performing crystallization processing on the supernatant and making analysis to obtain supernatant-related parameters, and making comprehensive analysis through combination of the supernatant-related parameters with urinary sediment-related parameters and urine dry chemistry-related parameters. The system comprises a urine processing module configured to process urine to obtain urinary sediment and supernatant, and a supernatant analysis module configured to perform crystallization processing on the supernatant and make analysis to obtain supernatant-related parameters, and to make comprehensive analysis through combination of the supernatant-related parameters with the urinary sediment-related parameters and the urine dry chemistry-related parameters.

The present invention discloses an experimental device and method for studying the wax deposition law in porous media in near-wellbore areas, belonging to the technical field of wax deposition experiments. The experimental device comprises a wax deposition visualization model, a multi-stage temperature control module, a liquid injection and cleaning module, a confining pressure adjustment module, a back pressure control module, a product recovery module and an image acquisition module; a natural core slice with a pore throat structure is simulated by a wax deposition visualization model, a multi-stage temperature control module is used to perform graded local heating to simulate complex formation temperature conditions, a confining pressure adjustment module is used to provide confining pressure, a back pressure control module is used to adjust the model outlet pressure to simulate bottom hole flow pressure, a liquid injection and cleaning module is used to inject crude oil and cleaning fluid therein, and an oil displacement experiment and subsequent cleaning are completed; an image acquisition module and a visualization clamping module are used to intuitively observe the wax deposition process in the model, and the wax crystal phase change process during the experiment is analyzed, and the wax deposition formulas of different parts of the model are used to characterize the step-by-step precipitation law of wax.

The application discloses an experimental device for simulating solidification structure of continuous casting billets, which comprises a crystallization unit and a temperature monitoring unit. The crystallization unit can enclose a crystallization cavity. A cooling channel is arranged in the water-cooled wall of the crystallization unit. The cooling channel is connected with a cooling medium source. The cooling intensity of the slab in the continuous casting production is simulated by controlling the temperature and flow rate of the cooling medium. The test element of the temperature monitoring unit can monitor the temperature of the cooling medium in the crystallization cavity in real time, so as to accurately restore the solidification process of the continuous casting billets. The application also discloses an experimental method for simulating solidification structure of continuous casting billets. The target unit is selected, and the cooling medium flow rate parameter is set to restore the change process of the cooling intensity of the surface of the continuous casting billets with time, and the heat flow density of the solidification process is analyzed. After the solidification is completed, the simulation unit is obtained, and the solidification structure of the simulation unit is analyzed. The application can accurately simulate the change process of the heat flow density of the surface of the slab in the continuous casting process, and provides convenience for the solidification structure research of the continuous casting billets.

This invention relates to the field of fault early warning technology and discloses a fault early warning system for desalination in saline soil areas based on multi-source data. The system includes a preprocessing module, a prediction module, a working condition monitoring module, a display module, and an optional fault location module for extended functions. The system predicts crystallization risk by monitoring multi-source parameters such as temperature, flow rate, concentration, and pressure head within the desalination pipe, and issues anomaly warnings before a fault occurs. This overcomes the shortcomings of existing technologies that cannot effectively monitor crystallization risk within the desalination pipe, and is of great significance for ensuring the reliable operation of the desalination system and the long-term stability of saline soil subgrades.

A method for monitoring a crystallizer in a high-temperature environment based on an improved BOCDA comprises the following steps: after a sensing optical fiber is laid on the surface of the crystallizer in a two-dimensional plane mode, the sensing optical fiber and the BOCDA arranged in a normal-temperature environment are respectively connected through a dispersion compensation optical fiber (DCF); the optical fiber Brillouin frequency shift (BFS) on a specific section distance in the sensing optical fiber is obtained by setting modulation frequency parameters, and then temperature information of the surface of the crystallizer is obtained through calculation. According to the invention, the sensing optical fiber with a heat-resistant coating layer is combined with the dispersion compensation optical fiber (DCF), and the BFS of the sensing optical fiber is remotely measured by utilizing the property that the BFS of the two optical fibers is greatly different, so that the accurate temperature measurement in a high-temperature environment is realized.

The present application provides a urine processing method and a urine testing system. The method comprises processing urine to obtain urinary sediment and supernatant, performing crystallization processing on the supernatant and making analysis to obtain supernatant-related parameters, and making comprehensive analysis through combination of the supernatant-related parameters with urinary sediment-related parameters and urine dry chemistry-related parameters. The system comprises a urine processing module configured to process urine to obtain urinary sediment and supernatant, and a supernatant analysis module configured to perform crystallization processing on the supernatant and make analysis to obtain supernatant-related parameters, and to make comprehensive analysis through combination of the supernatant-related parameters with the urinary sediment-related parameters and the urine dry chemistry-related parameters.

The present invention discloses an experimental device and experimental method for dynamic wax deposition or wax removal, which specifically relates to the technical field of oil and gas field development, including an experimental chamber, a displacement module, a controller, a pressure regulating module for regulating the pressure in the experimental chamber, a temperature control device for regulating the temperature in the experimental chamber, and an oil pumping device; the displacement module includes a liquid storage device and a driving device for transporting the substance in the liquid storage device to the experimental chamber; during the wax deposition experiment, a clean wellbore or a clean formation porous medium is placed in the experimental chamber, the liquid storage device stores an oil-water mixture, and the oil pumping device is used to extract the oil-water mixture in the central through hole of the clean wellbore; during the wax removal experiment, a waxed wellbore or a waxed formation porous medium is placed in the experimental chamber, and the liquid storage device stores a wax remover. The present invention can deeply understand the wax deposition rules and influencing factors of wellbores and formation porous media, evaluate the wax removal effects of different wax removers, optimize the oilfield mining process, improve recovery, and reduce costs.

The invention provides an ice crystal particle collecting device and method for an ice crystal parameter calibration test. The device comprises a liquid nitrogen storage tank, a lubricating oil tank, a heat preservation refrigeration pipe, a lubricating oil collecting tank with ice crystals and a lubricating oil flow curtain. Wherein the lubricating oil tank provides lubricating oil for the heat preservation refrigeration pipe, and the liquid nitrogen storage tank provides liquid nitrogen for the heat preservation refrigeration pipe so as to cool the lubricating oil. Lubricating oil on the lubricating oil flow curtain spreads to form an oil film flowing from top to bottom, and ice crystal particles can be conveniently carried to flow. The ice-crystal-containing lubricating oil collecting box is used for collecting ice crystal particles, and the ice crystal particles are maintained not to melt with the help of liquid nitrogen. According to the method, the ice crystal particles are conveyed into the ice-crystal-containing lubricating oil collecting box by means of flowing lubricating oil with the temperature lower than the freezing point, it is ensured that the ice crystal particles are collected in the non-melting state, and therefore the morphology of the collected ice crystal particles can be observed conveniently. Meanwhile, some basic parameters can be obtained through a simple measurement mode, the concentration of the ice crystal cloud field can be calculated, and the difficulty and cost of ice crystal cloud field measurement are reduced.

Provided is a multi-scale test device for crystallization performance of high-temperature melts, including a furnace body, an atmosphere control system, an optical path system, a temperature control system and a control display system. The furnace body includes furnace body includes a cavity, a thermocouple wire, a hot wire fixing block, a hot wire welding electrode, a reflecting surface, an air inlet pipe and an air outlet pipe. The thermocouple wire, the hot wire fixing block, the hot wire welding electrode and the reflecting surface are located in the cavity, the air inlet pipe and the air outlet pipe are in communication with the cavity. The thermocouple wire is connected with the hot wire welding electrode to form a heating wire structure onto which a sample is placed, and a center of the heating wire structure is located directly above the reflecting surface.

A method for measuring the physical properties of liquid / solid electrolytes, belonging to the field of nonferrous metallurgy, specifically discloses a finite element analysis-assisted thermal analysis method to obtain the thermal conductivity, primary crystallization temperature, electrolyte composition, and latent heat of phase transition of liquid / solid electrolytes. The method includes the following steps: measuring the thermal analysis curve of a liquid molten salt sample during cooling using a sensor; simulating the behavior of the thermal analysis curve using a sensor physical model established by finite element analysis; and comparing and analyzing the numerical thermal analysis curve and the measured thermal analysis curve to obtain the corresponding liquid / solid thermal conductivity, primary crystallization temperature, electrolyte composition, and latent heat of phase transition of the molten salt system. The method described in this invention can rapidly obtain the thermal conductivity, primary crystallization temperature, molten salt composition, and latent heat of phase transition of solid / liquid inorganic salts and multi-component mixtures, enabling online measurement of relevant physical properties of liquid molten salts and solid electrolytes, and possesses practicality and economy.

The invention relates to a wind tunnel-based pipeline surface frosting analysis test system and method, relates to the technical field of wind tunnel tests, and aims to research the surface frosting phenomenon of a pipeline and obtain the characteristics of the pipeline surface frosting rate. According to the scheme, the first view field rectangle and the second view field rectangle of the outer surface of the internally tangent pipeline can be obtained in real time based on the first image collecting device, the second image collecting device, the third image collecting device and the fourth image collecting device; and obtaining an octagon of which each edge is tangent to the outer surface of the pipeline based on the first field-of-view rectangle and the second field-of-view rectangle, calculating the length of each edge in the octagon, and calculating the sectional area and volume of the pipeline based on the length of each edge in the octagon so as to meet the analysis requirement of frost on the surface of the pipeline. On the basis, the surface frosting phenomenon of the pipeline can be researched, and the surface frosting rate of the pipeline can be obtained.

This invention relates to a wind tunnel-based system and method for analyzing pipe surface frost, belonging to the field of wind tunnel testing technology, to study the frost phenomenon on pipe surfaces and obtain the characteristics of the frost rate. In this application, a first and second field-of-view rectangle tangent to the outer surface of the pipe can be acquired in real time using a first, second, third, and fourth image acquisition device. Based on the first and second field-of-view rectangles, an octagon with each side tangent to the outer surface of the pipe is obtained, and the length of each side of the octagon is calculated. Then, the cross-sectional area and volume of the pipe are calculated based on the length of each side of the octagon to meet the analysis needs of pipe surface frost. Based on this, the frost phenomenon on the pipe surface can be studied, and the frost rate of the pipe surface can be obtained.

The present invention discloses a method for predicting the morphology of spherulites after crystallization based on DSC test results, comprising selecting representative cubic volume units, uniformly dividing the cubic unit grid into pixel point types, establishing a three-dimensional isothermal crystallization process crystal growth model of a semi-crystalline resin using a cellular automaton method, and inputting multiple sets of different parameters G and I based on the model to obtain the corresponding spherulite semi-crystallization time t. 0.5 The parameter ln(k) and the characteristic parameter t in the Avrami model of crystallization kinetics c The functional relationship between them is used to construct the average radius of the spherulites based on the multiple sets of different parameters G and I input above. <r>The functional relationship between the characteristic parameter Lc and the spherulite morphology after crystallization of semi-crystalline resin can be obtained by performing a simple DSC test on the material. 0.5 and the value of ln(k), the spherulite morphology after crystallization can be directly predicted through the obtained functional relationship, thus reducing the experimental time.< / r>

The invention relates to a carbon crystallization defect treatment technology in carbon recovery, and aims to improve the production efficiency and avoid the carbon crystallization defect. According to a plurality of historical production cycle production reports of carbon recovery, obtaining abnormal data of carbon crystal defects and integrating the abnormal data into a defect comparison table; in the current production cycle, carbon crystal growth data are monitored in real time, and abnormal growth data are identified and integrated into a predicted abnormal group by constructing a two-dimensional coordinate system, setting a reference line and an early warning line and analyzing a production change curve; performing normalization, time sequence feature extraction and other processing on the production data on the super early warning curve, constructing a multivariable feature vector, selecting an LSTM architecture time sequence model, and training a large model by using historical sample data; the trained large model is used for predicting the carbon crystal defects in the current production cycle, whether the defects occur or not is judged according to comparison between the prediction probability and a threshold value, if yes, an alarm is generated, and technicians analyze reasons and intervene according to the alarm, so that the defects are effectively avoided, and the production efficiency and quality are improved.

The invention discloses a multi-channel crystallization process rapid screening method combined with microflow imaging analysis, which comprises the following steps: S1, lifting an upper sealing cover, putting into six crystallization glass beakers, and adding raw materials and solvents into the respective beakers; s2, lowering an upper sealing cover, connecting external circulation of a high-low temperature circulator to a temperature control tank, starting a magnetic stirrer and temperature control through program control, and starting dissolution; s3, after dissolution is completed, cooling crystallization is achieved by reducing the temperature or solvent-out crystallization is achieved by adding a poor solvent into a feeding opening in the upper portion; and S4, after the crystals are separated out, starting an automatic sampling program, and carrying out wet particle size and particle shape detection on the crystal recrystallization sample of each channel to obtain morphology results under different experimental conditions. According to the invention, real-time monitoring of particle morphology in a wet environment can be realized, disturbance of the whole process to a crystallization system is minimum, real'lossless' monitoring is realized, and the method has the advantages of high time resolution, resource saving and the like.

The invention provides flow and particle size adjustable ice crystal cloud field construction equipment and method. The equipment comprises a liquid nitrogen supply mechanism, an ice crystal grinding mechanism, an ice crystal particle size screening mechanism and an ice crystal particle conveying mechanism. The liquid nitrogen supply mechanism is responsible for supplying low-temperature nitrogen to ensure that the whole system is in a low-temperature state; the ice crystal grinding mechanism is responsible for providing crushed ice; the ice crystal particle size screening mechanism is responsible for screening out ice crystals of which the particle sizes meet the requirements of an ice crystal cloud field from the crushed ice; the ice crystal particle conveying mechanism is responsible for blowing ice crystals to form a cloud field. Through cooperation of all the mechanisms, the ice crystal particles meeting the standard particle size (50-200 microns) are successfully obtained, the ice crystal particles meeting the MVD requirement of an ice crystal cloud field are accurately screened out, and the ice crystal particles are quantitatively and stably conveyed to a downstream test piece. Meanwhile, the particle size range and the supply amount of the ice crystals are adjustable, so that an ice crystal cloud field which meets the FAR-25 requirement and is controllable in concentration and particle size distribution can be formed.

The present application provides a urine processing method and a urine testing system. The method comprises processing urine to obtain urinary sediment and supernatant, performing crystallization processing on the supernatant and making analysis to obtain supernatant-related parameters, and making comprehensive analysis through combination of the supernatant-related parameters with urinary sediment-related parameters and urine dry chemistry-related parameters. The system comprises a urine processing module configured to process urine to obtain urinary sediment and supernatant, and a supernatant analysis module configured to perform crystallization processing on the supernatant and make analysis to obtain supernatant-related parameters, and to make comprehensive analysis through combination of the supernatant-related parameters with the urinary sediment-related parameters and the urine dry chemistry-related parameters.

The invention discloses a method for measuring the static recrystallization temperature of a Q420 cold-rolled sheet based on an orthogonal test and thermal simulation, which comprises the following steps: 1) sample preparation: taking a Q420 cold-rolled sheet with a thickness, processing the Q420 cold-rolled sheet into a standard sample, and using the center area of the sample for thermal treatment simulation; 2) orthogonal test design; 3) thermal simulation experiment: simulating a continuous annealing process by using a simulation testing machine; 4) testing hardness; recrystallization temperature is judged; and in combination with a metallographic structure, taking an average value of a plurality of groups of tests TRX, namely the static recrystallization temperature range of the Q420 cold-rolled sheet. According to the method, key parameters such as the annealing temperature and the heat preservation time are optimized through an orthogonal test, the continuous annealing process is simulated by combining a thermal simulation testing machine, the softening trend is analyzed through a Rockwell hardness test, and the static recrystallization temperature range is defined.

The invention provides potassium sulfate and sodium sulfate crystallization detection equipment and a preferential crystallization method, and relates to the technical field of visual detection, the equipment comprises a mounting seat, a collection cup, a driving mechanism and a detection mechanism; a mounting cover is mounted at the top of the mounting base through bolts, a middle plate is fixedly arranged in the mounting cover, the driving mechanism comprises a motor which is mounted in the mounting base and located in the middle of the bottom of the middle plate, and a positioning frame is fixedly arranged in the mounting cover and located above the middle plate. According to the scheme, when the industrial camera rotates forwards relative to the collection cup, the industrial camera and the collection cup form differential motion, the field of view of the industrial camera scans each area in the collection cup, the problems that fixed detection can only shoot local areas, cup walls are blocked and other blind areas are solved, the accuracy of visual detection is further improved, and the detection efficiency is improved. Omni-directional imaging of a solid-liquid two-phase system in the cup can be achieved through cooperation of the two, crystals attached to the cup wall, crystals deposited at the bottom and suspended crystals can be clearly captured, and omni-directional detection is achieved.

The invention relates to the technical field of fault early warning, and discloses a salt elimination fault early warning system in a saline soil area based on multi-source data, which comprises a preprocessing module for realizing basic functions, a prediction module, a working condition monitoring module, a display module and an optional fault positioning module for realizing extended functions. According to the system, the crystallization risk is predicted by monitoring the multi-source parameters of the temperature, the flow speed, the concentration and the pressure water head in the salt elimination pipe, abnormity warning is conducted before a fault occurs, and the defect that the crystallization risk in the salt elimination pipe cannot be effectively monitored in the prior art is overcome; the method is of great significance to guarantee reliable operation of a salt elimination system and long-term stability of a salinized soil roadbed.

The invention discloses a silicone rubber composite material and an electrical parameter regulation and control method of a crystalline state of the silicone rubber composite material. The composite material comprises: 100 parts of a silicone rubber matrix; 40 to 120 parts of a flame retardant filler; the flame-retardant filler is aluminum hydroxide, the enhanced filler is silicon dioxide, and the relative crystallinity of the composite material at the temperature of-60 DEG C is 0.4-0.6. According to the composite material, the crystalline state of the silicone rubber composite material is represented through the combination of DSC and XRD, the association between the crystalline state and electrical parameters is established in combination with a broadband dielectric spectrum test, and theoretical guidance is provided for the design of the novel silicone rubber composite material.

The invention provides a dynamic recrystallization test method and application of a steel grade sensitive to deformation due to temperature change, and the method comprises the following steps: welding a thermocouple at the middle position of the cylindrical surface of a sample, the interval between the positive electrode and the negative electrode of the thermocouple being 1.0 + / -0.2 mm; a graphite gasket is arranged between the contact surfaces of the clamp and the sample to form a sample-clamp system; the thickness of the graphite gasket is 0.05 to 0.15 mm; placing the sample-clamp system in a vacuum chamber, vacuumizing until the pressure is less than or equal to 1 * 10 <-3 > Pa, and filling inert protective gas until the pressure is 0.1-0.3 MPa; and heating to 900-1150 DEG C at the speed of 5-15 DEG C / s, preserving heat for 30-120 seconds, and monitoring the temperature of the sample in real time through a thermocouple. The test method provided by the invention has good application in dynamic recrystallization behavior tests of high manganese steel and duplex stainless steel. The method is simple and convenient to operate.

The application discloses a liquid sample crystallization real-time detection method based on an intelligent sensor and relates to the technical field of intelligent sensors.The method comprises the following steps: step 1, a liquid sample is combined with a toluene-acetone adjustable ratio ternary dewaxing medium composed of toluene, acetone and solvent oil according to a predetermined volume ratio, and a uniform mixed system is formed in a constant-temperature liquid preparation environment; step 2, the mixed system is placed into a sedimentation device; step 3, after an external physical field is terminated, the mixed system is allowed to stand and settle, wavelet analysis is performed to extract a wax precipitation signal, and a wax precipitation end point is determined according to a preset threshold; step 4, a wax-containing layer is separated at the wax precipitation end point, and the wax content of the liquid sample is output; and step 5, supernatant obtained after the standing and settling is completed is taken and reacted in a water bath to form a yellow complex.The application has the advantages of a short detection period, high separation efficiency, accurate signal recognition and objective and automatic calculation process.

The invention relates to the field of material forging forming, and discloses a hub bearing dynamic recrystallization microstructure evolution visual prediction method, which comprises the following steps of: performing an isothermal thermal compression test on a raw material, and establishing a raw material constitutive model, a peak strain model, a critical strain model and a dynamic recrystallization and grain size model based on test data; a material plastic forming technology is combined, and a finite element model of continuous multiple stations such as upsetting, pre-forging and finish forging is established; the transient evolution rule of each field quantity and microstructure in each station is analyzed, and microstructure distribution can be predicted in advance. According to the method, instantaneous visual characterization and prediction of important field quantities and microstructures in the whole forging process of the hub bearing mandrel can be achieved, the forging process is optimized, the test efficiency is greatly improved, and the cost is greatly reduced.

The application discloses an experimental device and method suitable for testing deposition of ammonium chloride particles on the wall of a tube bundle, wherein a test section is horizontally arranged, an outlet in an air heating system is connected with a horizontal inlet of the test section, a part of a solution atomization system is arranged inside a vertical inlet of the test section, heat exchange tubes in a heat exchange system are arranged in the middle of the test section, and an outlet of the test section is connected with a waste gas collector; and a shooting system is arranged towards a quartz glass tube of the test section and shoots. By adjusting different gas flow rates, humidity and water temperature, the application can observe the deposition process of crystalline particles on the wall of the heat exchange tubes, analyze the crystalline phase structure and deposition amount of the outer wall of the tube bundle, calculate the deposition layer thickness and deposition rate of the crystalline phase on the wall of the heat exchange tubes under different working conditions, and research the deposition of ammonium chloride crystalline particles in a petrochemical system.

The invention discloses a liquid sample crystallization precipitation real-time detection method based on an intelligent sensor, and relates to the technical field of intelligent sensors, and the method comprises the following steps: 1, combining a liquid sample with a toluene-acetone ratio-adjustable ternary dewaxing medium composed of toluene, acetone and solvent oil according to a predetermined volume ratio, a uniform mixed system is formed in a constant-temperature liquid preparation environment; step 2, putting the mixed system into a sedimentation device; 3, after the external physical field is terminated, standing settlement is conducted on the mixed system, then wavelet analysis is executed to extract a wax precipitation signal, and a wax precipitation end point is judged according to a preset threshold value; 4, separating a wax-containing layer at a wax precipitation end point, and outputting the wax content of the liquid sample; and step 5, taking supernate obtained after standing and settling are finished, and reacting in a water bath to form a yellow complex. The method has the advantages of short detection period, high separation efficiency, accurate signal identification, objective and automatic calculation process and the like.

The application relates to an evaluation method of demulsification performance of a cationic aromatic side chain demulsifier, which comprises the following steps: S1, synthesizing 4-bromobutyl triethylammonium bromide, 4-bromobutyl benzalkonium bromide and 4-bromobutyl quinoline bromide, and then synthesizing target products triethylamine-poly succinimide, N, N-dimethyl benzylamine-poly succinimide and quinoline-poly succinimide by chemical modification with poly succinimide as a main chain. The evaluation method of demulsification performance of the cationic aromatic side chain demulsifier, the synthesized TEA-PSI, BZK-PSI and QA-PSI demulsifiers can all be high-efficiency demulsification under different pH conditions, especially under acidic conditions (such as pH=2.0), the demulsification effect is particularly remarkable, and in actual application, the demulsification effect can be guaranteed even under harsh conditions, the demulsifier can not only effectively demulsify, but also can inhibit scale formation to a certain extent, so that the equipment corrosion is reduced, the service life of the equipment is prolonged, the production cost is reduced, the demulsifier has good biocompatibility and environmental friendliness.

The invention belongs to the field of food detection, and particularly relates to a meat ice crystal temperature point rapid measurement method and system based on low-field nuclear magnetic resonance. By optimizing test parameters of the low-field nuclear magnetic resonance spectrometer and combining accurate temperature control of the low-temperature constant-temperature module, continuous acquisition of gradient cooling signals from normal temperature to-80 DEG C can be realized only by directly putting a meat sample into a low-temperature-resistant sealed sample tube, and a moisture phase change inflection point is determined through a change curve of a transverse relaxation time T2 spectrum. The corresponding temperature is the ice crystal temperature point. The method has the advantages of no damage to samples in the detection process, no pollution, simple and easy operation, low instrument and equipment maintenance cost, good stability and high reliability, and can be used in field environments such as food processing workshops and refrigeration houses. The detection result is high in accuracy, the actual condition of the ice crystal point of the chicken can be accurately reflected, and a scientific basis is provided for optimization of a freezing process.