Medium dehydration intrinsic dynamics law detection system and analysis method

Abstract

The invention discloses a medium dehydration intrinsic dynamics law detection system and an analysis method, and relates to the field of dehydration rate testing. According to the medium dehydration intrinsic dynamics law analysis method, the dehydration rate and the Darcy seepage resistance of a to-be-detected medium in a rapid dehydration stage are obtained, and the permeability, the pre-exponential factor and the dehydration activation energy of the to-be-detected medium are calculated according to the dehydration rate and the Darcy seepage resistance of the to-be-detected medium in the rapid dehydration stage. And further predicting the dehydration rate of the to-be-detected medium in other dehydration stages. According to the medium dehydration intrinsic dynamic law detection system and the analysis method, medium intrinsic dehydration dynamic parameters are obtained through inversion of a seepage model and a desorption dynamic model according to different dehydration mechanisms in different stages of a to-be-detected medium; therefore, the method is used for predicting the medium dehydration rate under different working conditions according to the intrinsic dehydration kinetic parameters of the medium, and the problems that a traditional medium dehydration test method can only obtain the apparent dehydration rate and the test result is poor in universality along with the change of the test conditions are solved.

Description

Technical Field

[0001] The present application relates to the field of dehydration rate testing, and in particular, to a medium dehydration intrinsic kinetic law detection system and analysis method. Background Art

[0002] The detection of the dehydration characteristics of the medium is a common requirement in many fields such as food, chemical industry, civil engineering, and environmental protection. The shape of the curve of the cumulative dehydration amount of the conventional medium dehydration process over time is similar to the Langmuir curve within a certain moisture content range. Therefore, the existing method for characterizing the dehydration law of the medium mainly obtains the law of the change of moisture content over time to obtain the limit dehydration amount and desorption constant for calculation. However, the above parameters are only apparent parameters under specific working conditions and need to be retested for different working conditions. In practical applications, it is often necessary to select appropriate drying gas composition (such as air, carbon dioxide, nitrogen, etc.), temperature, pressure, and flow rate parameters based on the dehydration characteristics of the medium under different working conditions, taking into account factors such as effect and cost. If traditional testing and analysis methods are used, a large number of repetitive tests will inevitably be required.

[0003] Therefore, a testing system and method are needed to predict the dehydration rate of the medium under different working conditions. Summary of the invention

[0004] The purpose of the present application is to provide a medium dehydration intrinsic kinetic law detection system and analysis method, which obtains the medium intrinsic dehydration kinetic parameters by using seepage and desorption inversion, and then predicts the medium dehydration rate under different working conditions based on the medium intrinsic dehydration kinetic parameters.

[0005] This application is implemented as follows: The present application provides a medium dehydration intrinsic dynamic law detection system, which includes: A sample detection reactor is provided with a detection chamber for accommodating a medium to be detected and a gas inlet and a gas outlet respectively connected to two ends of the detection chamber; a flow controller, disposed at the gas inlet, for regulating the gas flow through the gas inlet; An inlet pressure sensor, used for detecting the gas inlet pressure; An outlet pressure sensor, used for detecting the gas outlet pressure; A temperature sensor, used for detecting the gas inlet temperature; A pair of porous distribution plates are arranged in the detection chamber, and one of the porous distribution plates is respectively arranged between the gas inlet and the gas outlet and the two ends of the medium to be detected; a drying device, connected to the gas outlet, for drying the gas discharged from the gas outlet; The weight detection device is used to detect the weight of the drying device in real time.

[0006] In some optional embodiments, a sample carrying device is further included in the detection chamber, and the sample carrying device includes two coarse-porous carrying plates arranged at both ends of the medium to be detected, and the two porous distribution plates are respectively pressed against the two coarse-porous carrying plates.

[0007] In some optional embodiments, one-way air-permeable membranes are respectively provided at both ends of the medium to be detected and between the two coarse-pore supporting plates, and the one-way air-permeable membranes are used to limit the one-way movement of gas from the gas inlet toward the gas outlet.

[0008] In some optional embodiments, a humidity flow detection device connected to the drying device is further included; the humidity flow detection device is used to receive the gas discharged after drying by the drying device and detect the humidity and flow of the gas after drying by the drying device.

[0009] The present application also provides a method for analyzing the intrinsic kinetics of medium dehydration, which comprises the following steps: Obtain the dehydration rate and Darcy seepage resistance of the medium to be tested in the rapid dehydration stage; Calculating the permeability of the medium to be detected according to the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage; Obtaining the dehydration rate of the medium to be detected in the deep dehydration stage, and calculating the pre-exponential factor and dehydration activation energy of the medium to be detected; The dehydration rate of the medium to be detected in the deep dehydration stage under the new working condition is calculated according to the pre-exponential factor and dehydration activation energy of the medium to be detected.

[0010] In some optional embodiments, the following method is used to obtain the dehydration rate and Darcy seepage resistance of the medium to be tested in the rapid dehydration stage: The gas is passed into the detection chamber through the gas inlet and discharged from the gas inlet to the drying device for drying. When the gas flow rate into the detection chamber is stable at Q, the pressure of the gas inlet and the gas outlet are recorded as p 11 and p 12 ; The quality is m 0 to be detected is placed in the detection chamber and the above steps are repeated to record the pressure of the gas inlet and the gas outlet respectively. p 21 and p 22 , calculate the Darcy seepage resistance of the medium to be tested : ; The law of the weight change of the drying device over time is recorded, and the dehydration rate of the medium to be detected in the rapid dehydration stage is calculated according to the law of the weight change of the drying device over time.

[0011] In some optional embodiments, the permeability of the medium to be detected is calculated using the following formula: ; In the formula, is the permeability of the medium to be detected; is the viscosity of the gas passing through the medium to be detected into the detection chamber; L is the length of the medium to be detected in the direction of gas flow; The Darcy flow resistance of the gas passing through the medium to be detected into the detection cavity; is the windward area of ​​the medium to be tested; It is the dehydration rate of the medium to be tested in the rapid dehydration stage.

[0012] In some optional embodiments, after the permeability of the medium to be detected is calculated, when the working conditions change, the dehydration rate of the medium to be detected in the rapid dehydration stage under the new working conditions is predicted by the following formula: ; In the formula, The dehydration rate of the medium to be tested in the rapid dehydration stage under new working conditions; is the permeability of the medium to be tested; The viscosity of the gas passing through the medium to be tested into the test chamber for the new working condition; The length of the medium to be tested in the gas flow direction under the new working condition; The Darcy flow resistance of the gas passing through the medium to be detected into the detection cavity under the new working condition; It is the windward area of ​​the medium to be tested under new working conditions.

[0013] In some optional embodiments, the time-varying pattern of the weight of the drying device is continuously recorded until the weight of the drying device no longer changes with time, and the dehydration rate of the medium to be detected in the deep dehydration stage is calculated according to the time-varying pattern of the weight of the drying device; The pre-exponential factor and dehydration activation energy of the medium to be detected are calculated using the following formula: ; In the formula, It is the dehydration rate of the unit mass of the medium to be tested in the deep dehydration stage; is the pre-exponential factor; is the dehydration activation energy; R is the thermodynamic constant; T0 is the temperature of the gas passing through the gas inlet.

[0014] In some optional embodiments, the dehydration rate of the medium to be detected in the deep dehydration stage under the new working condition is calculated using the following formula according to the pre-exponential factor and dehydration activation energy of the medium to be detected: ; In the formula, It is the dehydration rate of the unit mass of the medium to be tested in the deep dehydration stage of the new working condition; is the pre-exponential factor; is the dehydration activation energy; R is the thermodynamic constant; T is the temperature of the gas passing through the gas inlet under the new working conditions.

[0015] In some optional embodiments, after calculating the pre-exponential factor and dehydration activation energy of the medium to be detected, the dimensionless time of the deep dehydration stage of the medium to be detected under the detection conditions is calculated to determine the accuracy of the calculated pre-exponential factor and dehydration activation energy.

[0016] In some optional embodiments, the following method is used to determine the accuracy of the calculated pre-exponential factor and dehydration activation energy: The characteristic time scale of the convective transport process is calculated according to the following formula: ; In the formula, is the characteristic time scale of gas flow; d is the average pore size of the sample to be tested; is the average flow rate of gas in the detection chamber; The characteristic time scale of the water desorption process is calculated according to the following formula: ; In the formula, is the characteristic time scale of the water desorption process; is the molar mass of water; The molar amount of water in the unit volume of gas introduced into the detection chamber when it reaches saturation can be obtained by consulting the thermal properties parameter manual; is the pre-exponential factor; is the dehydration activation energy; R is the thermodynamic constant; T0 is the temperature of the gas passing through the gas inlet; The dimensionless time of the deep dehydration stage of the medium to be tested under the test conditions is calculated according to the following formula: ; like Da ≤1, the accuracy of the calculated pre-exponential factor and dehydration activation energy is reliable; if Da >1, the accuracy of the calculated pre-exponential factor and dehydration activation energy is unreliable.

[0017] In some optional embodiments, when Da>1, the dehydration rate and Darcy seepage resistance of the medium to be tested in the rapid dehydration stage are re-obtained, and the gas flow rate into the detection chamber is adjusted to be stable at Q× Da above.

[0018] The beneficial effects of the present application are as follows: the medium dehydration intrinsic kinetic law detection system and analysis method provided by the present application obtains the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage; calculates the permeability of the medium to be detected according to the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage; obtains the dehydration rate of the medium to be detected in the deep dehydration stage, calculates the pre-exponential factor and dehydration activation energy of the medium to be detected; calculates the dehydration rate of the medium to be detected in the deep dehydration stage under new working conditions according to the pre-exponential factor and dehydration activation energy of the medium to be detected. The medium dehydration intrinsic kinetic law detection system and analysis method provided by the present application adopts the seepage model and the desorption kinetic model to invert and obtain the medium intrinsic dehydration kinetic parameters according to the different dehydration mechanisms of the medium to be detected at different stages, so as to predict the medium dehydration rate under different working conditions according to the medium intrinsic dehydration kinetic parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Picture 1 A partial cross-sectional structural schematic diagram of a medium dehydration intrinsic dynamics law detection system provided in an embodiment of the present application; Picture 2 A schematic diagram of the structure of a sample carrying device carrying a medium to be detected in a medium dehydration intrinsic dynamics law detection system provided in an embodiment of the present application; Picture 3 A schematic flow chart of a method for analyzing the intrinsic kinetics of medium dehydration provided in an embodiment of the present application.

[0021] In the figure: 100, sample detection reactor; 110, detection chamber; 120, gas inlet; 130, gas outlet; 140, flow controller; 150, inlet pressure sensor; 160, outlet pressure sensor; 170, temperature sensor; 200, sample supporting device; 210, porous distribution plate; 220, coarse-pore supporting plate; 230, one-way breathable membrane; 300, drying device; 400, weight detection device; 500, humidity flow detection device; 600, data acquisition module; 700, medium to be detected. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] The characteristics and performance of the medium dehydration intrinsic kinetic law detection system and analysis method of the present application are further described in detail below in conjunction with the embodiments.

[0025] like Picture 1 and Picture 2 As shown, the embodiment of the present application provides a medium dehydration intrinsic dynamic law detection system, which includes a sample detection reactor 100 provided with a detection cavity 110, a sample carrying device 200 provided in the detection cavity 110, a drying device 300, a weight detection device 400, a humidity flow detection device 500 and a data acquisition module 600; The bottom and top of the sample detection reactor 100 are respectively provided with a gas inlet 120 and a gas outlet 130 connected to the detection chamber 110. The gas inlet 120 is provided with a flow controller 140, an inlet pressure sensor 150 and a temperature sensor 170. The flow controller 140 is used to adjust the gas flow through the gas inlet 120, the inlet pressure sensor 150 is used to detect the gas pressure through the gas inlet 120, and the temperature sensor 170 is used to detect the gas temperature through the gas inlet 120. The gas outlet 130 is provided with an outlet pressure sensor 160, and the outlet pressure sensor 160 is used to detect the gas pressure through the gas outlet 130. A pair of porous distribution plates 210 for clamping the sample carrier 200 is provided in the detection chamber 110, and a porous distribution plate 210 is respectively provided between the gas inlet 120 and the gas outlet 130 and the two ends of the sample carrier 200. The sample carrier 200 includes two coarse-porous carrier plates 220 provided at the two ends of the medium to be detected 700, and a one-way gas permeable membrane 230 is respectively provided between the two ends of the medium to be detected 700 and the two coarse-porous carrier plates 220. The one-way gas permeable membrane 230 is used to limit the gas to move in one direction from the gas inlet 120 to the gas outlet 130; the two porous distribution plates 210 press against the two coarse-porous carrier plates 220 respectively; The drying device 300 is connected to the gas outlet 130 to dry the gas discharged from the gas outlet 130, and the weight detection device 400 is used to detect the weight of the drying device 300 in real time; the humidity flow detection device 500 is connected to the drying device 300, and is used to receive the gas discharged after drying by the drying device 300 and detect the humidity and flow of the gas after drying by the drying device 300; the data acquisition module 600 is electrically connected to the inlet pressure sensor 150, the outlet pressure sensor 160, the weight detection device 400, and the humidity flow detection device 500, respectively, and the data acquisition module 600 is used to record the pressure detected by the inlet pressure sensor 150, the pressure detected by the outlet pressure sensor 160, the weight detected by the weight detection device 400, and the humidity and flow detected by the humidity flow detection device 500.

[0026] like Picture 3 As shown, the embodiment of the present application also provides a method for analyzing the intrinsic kinetic law of medium dehydration, which comprises the following steps: Step 1: obtaining the dehydration rate and Darcy seepage resistance of the medium to be tested 700 in the rapid dehydration stage; The above-mentioned medium dehydration intrinsic dynamic law detection system is used to test the medium 700 to be detected; before the medium 700 to be detected is placed in the detection chamber 110, the gas is introduced into the detection chamber 110 through the gas inlet 120 and discharged from the gas inlet 120 to the drying device 300 for drying, and the gas flow rate into the detection chamber 110 is adjusted by the flow controller 140 to be stable at Q, and the pressures of the gas inlet 120 and the gas outlet 130 are recorded as p 11 and p 12 , record the gas temperature T0 passing through the gas inlet 120.

[0027] The quality of m After the medium to be detected 700 of 0 is placed in the detection chamber 110, one-way air-permeable membranes 230 are respectively arranged at both ends of the medium to be detected 700, coarse-hole carrier plates 220 are respectively arranged on the side of the two one-way air-permeable membranes 230 away from the medium to be detected 700, and porous distribution plates 210 are respectively arranged on the ends of the two coarse-hole carrier plates 220 away from the medium to be detected 700, and the gas is introduced into the detection chamber 110 through the gas inlet 120 and discharged from the gas inlet 120 to the drying device 300 for drying, and the gas flow rate introduced into the detection chamber 110 is adjusted by the flow controller 140 to be stable at Q, and the pressures of the gas inlet 120 and the gas outlet 130 are respectively recorded as p 21 and p 22 , calculate the Darcy seepage resistance of the medium to be tested 700 : ; Record the law of the weight change of the drying device 300 over time, and calculate the dehydration rate of the medium to be tested 700 in the rapid dehydration stage according to the law of the weight change of the drying device 300 over time. , continue to record the time-varying pattern of the weight of the drying device 300 until the weight of the drying device 300 no longer changes with time, and calculate the dehydration rate of the medium 700 to be tested in the deep dehydration stage .

[0028] When recording the pattern of the weight change of the drying device 300 over time, pay attention to whether the humidity data detected by the humidity flow detection device 500 changes. When it is found that the humidity data detected by the humidity flow detection device 500 increases, it is necessary to replace the desiccant in the drying device 300 and restart the test.

[0029] Step 2: Calculate the permeability of the medium 700 to be tested according to the dehydration rate of the medium 700 to be tested in the rapid dehydration stage and the Darcy seepage resistance; The permeability of the medium 700 to be detected is calculated using the following formula: ; In the formula, is the permeability of the medium to be tested, in kg / m; is the viscosity of the gas passing through the medium 700 to be detected and entering the detection chamber 110, in N·s / m 2 ; L is the length of the medium to be detected in the gas flow direction, in meters; The Darcy flow resistance of the gas passing through the medium to be detected into the detection cavity, in Pa; is the windward area of ​​the medium to be tested, in m 2 ; It is the dehydration rate of the medium to be tested in the rapid dehydration stage, in kg / s.

[0030] When the working conditions change, the dehydration rate of the medium to be tested in the rapid dehydration stage under the new working conditions can be predicted by the following formula: ; In the formula, The dehydration rate of the medium to be tested in the rapid dehydration stage under the new working conditions, in kg / s; is the permeability of the medium to be tested, in kg / m; The viscosity of the gas passing through the medium to be detected and entering the detection chamber 110 under the new working condition, in N·s / m 2 ; The length of the medium to be tested in the gas flow direction under the new working condition, in meters; The Darcy flow resistance of the gas passing through the detection chamber 110 and the medium to be detected under the new working condition, in Pa; is the windward area of ​​the medium to be tested under the new working condition, in m 2 .

[0031] Step 3: Calculate the pre-exponential factor and dehydration activation energy of the medium to be tested using the following formula: ; In the formula, It is the dehydration rate of the unit mass of the medium to be tested in the deep dehydration stage, in kg / s; is the pre-exponential factor, unit is kg / s; is the dehydration activation energy, in J / mol; R is a thermodynamic constant, in J / (mol·K); T0 is the temperature of the gas passing through the gas inlet 120, in K.

[0032] Step 4: Determine the accuracy of the measured pre-exponential factor and dehydration activation energy according to the following method: The characteristic time scale of the convective transport process is calculated using the following formula: ; In the formula, is the characteristic time scale of gas flow, in seconds; d is the microscopic characteristic size of the sample to be tested, usually the particle size of the smallest particle unit that constitutes the porous medium of the sample to be tested. For the convenience of acquisition, the average pore size of the porous medium of the sample to be tested can be directly taken, in meters; is the average flow velocity of the gas in the detection chamber 110, which is calculated based on the ratio of the steady-state gas flow Q to the cross-sectional area of ​​the detection chamber 110, and the unit is m / s.

[0033] The characteristic time scale of the desorption process is calculated according to the following formula: ; In the formula, is the characteristic time scale of the water desorption process, in seconds; is the molar mass of water in kg / mol; It is the molar amount of water in the unit volume of gas entering the detection chamber when it reaches saturation, which is obtained by querying the thermal physical property parameter manual, and the unit is mol. The dimensionless time of the deep dehydration stage of the medium to be tested under the test conditions is calculated according to the following formula: ; like Da ≤1, the test result is reliable and we can continue with step 5. Da >1, the gas flow rate into the detection chamber 110 should be adjusted to be stable at Q× Da The above fixed value is used, and the test is repeated from step 1 to calculate the dehydration rate and Darcy seepage resistance of the medium 700 to be tested in the rapid dehydration stage.

[0034] Step 5: When the working condition changes, the dehydration rate of the medium to be tested 700 in the deep dehydration stage under the new working condition is calculated according to the pre-exponential factor and dehydration activation energy of the medium to be tested 700: ; In the formula, is the dehydration rate of the unit mass of the medium to be tested in the deep dehydration stage under the new working conditions, in kg / s; is the pre-exponential factor, unit is kg / s; is the dehydration activation energy, in J / mol; R is the thermodynamic constant, in J / (mol·K); T is the temperature of the gas passing through the gas inlet 120 under the new operating condition, in K.

[0035] The medium dehydration intrinsic kinetic law detection system and analysis method provided in the embodiment of the present application are configured to set up a sample detection reactor 100 to accommodate the medium 700 to be detected and finely control the mass transfer conditions for the dehydration of the medium 700 to be detected to conduct experiments, thereby obtaining the dehydration rate of the medium 700 to be detected under a specific carrier gas flow intensity, and then according to the different dehydration mechanisms of the medium 700 to be detected at different stages, the intrinsic dehydration kinetic parameters of the medium 700 to be detected are obtained by inversion using a seepage model and a desorption kinetic model, respectively. The intrinsic dehydration kinetic parameters of the medium 700 to be detected are used to predict the rapid dehydration rate and deep dehydration rate of the medium under different working conditions, thereby solving the problems that the traditional medium dehydration test method can only obtain the apparent dehydration rate and the test results lack universality due to changes in the test conditions.

[0036] The new working condition described in the embodiment of the present application is to perform a dehydration test on the medium to be detected 700 by changing different gas types, temperature, pressure, and flow rates. Each time the above test parameters are changed to perform a dehydration test, it is a new working condition.

[0037] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A medium dehydration intrinsic dynamics law detection system, characterized in that: It includes: A sample detection reactor is provided with a detection chamber for accommodating a medium to be detected and a gas inlet and a gas outlet respectively connected to two ends of the detection chamber; a flow controller, disposed at the gas inlet, for regulating the gas flow through the gas inlet; An inlet pressure sensor, used for detecting the gas inlet pressure; An outlet pressure sensor, used for detecting the gas outlet pressure; A temperature sensor, used for detecting the gas inlet temperature; A pair of porous distribution plates are arranged in the detection chamber, and one of the porous distribution plates is respectively arranged between the gas inlet and the gas outlet and the two ends of the medium to be detected; a drying device, connected to the gas outlet, for drying the gas discharged from the gas outlet; The weight detection device is used to detect the weight of the drying device in real time.

2. The medium dehydration intrinsic dynamics law detection system according to claim 1 is characterized in that: It also includes a sample carrying device arranged in the detection chamber, the sample carrying device includes two coarse-porous carrying plates arranged at both ends of the medium to be detected, and the two porous distribution plates respectively press against the two coarse-porous carrying plates.

3. The medium dehydration intrinsic dynamics law detection system according to claim 2 is characterized in that: One-way air-permeable membranes are respectively arranged at both ends of the medium to be detected and between the two coarse-pore supporting plates, and the one-way air-permeable membranes are used to limit the one-way movement of gas from the gas inlet toward the gas outlet.

4. The medium dehydration intrinsic dynamics law detection system according to claim 1 is characterized in that: It also includes a humidity flow detection device connected to the drying device; the humidity flow detection device is used to receive the gas discharged after drying by the drying device and detect the humidity and flow of the gas discharged after drying by the drying device.

5. A method for analyzing the intrinsic kinetics of medium dehydration, characterized in that: It includes the following steps: Obtain the dehydration rate and Darcy seepage resistance of the medium to be tested in the rapid dehydration stage; Calculating the permeability of the medium to be detected according to the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage; Obtaining the dehydration rate of the medium to be detected in the deep dehydration stage, and calculating the pre-exponential factor and dehydration activation energy of the medium to be detected; The dehydration rate of the medium to be detected in the deep dehydration stage under the new working condition is calculated according to the pre-exponential factor and dehydration activation energy of the medium to be detected.

6. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 5, characterized in that: The dehydration rate and Darcy seepage resistance of the medium to be tested in the rapid dehydration stage are obtained using the following method: The gas is passed into the detection chamber through the gas inlet and discharged from the gas inlet to the drying device for drying. When the gas flow rate into the detection chamber is stable at Q, the pressure of the gas inlet and the gas outlet are recorded as p 11 and p 12 ; The quality is m 0 to be detected is placed in the detection chamber and the above steps are repeated to record the pressure of the gas inlet and the gas outlet respectively. p 21 and p 22 , calculate the Darcy seepage resistance of the medium to be tested : ; The law of the weight change of the drying device over time is recorded, and the dehydration rate of the medium to be detected in the rapid dehydration stage is calculated according to the law of the weight change of the drying device over time.

7. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 6, characterized in that: The permeability of the medium to be detected is calculated using the following formula: ； In the formula, is the permeability of the medium to be detected; is the viscosity of the gas passing through the medium to be detected into the detection chamber; L is the length of the medium to be detected in the direction of gas flow; The Darcy flow resistance of the gas passing through the medium to be detected into the detection cavity; is the windward area of ​​the medium to be tested; It is the dehydration rate of the medium to be tested in the rapid dehydration stage.

8. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 7, characterized in that: After the permeability of the medium to be tested is calculated, when the working conditions change, the dehydration rate of the medium to be tested in the rapid dehydration stage under the new working conditions is predicted by the following formula: ； In the formula, is the dehydration rate of the medium to be tested in the rapid dehydration stage under new working conditions, is the permeability of the medium to be tested; The viscosity of the gas passing through the medium to be tested into the test chamber for the new working condition; The length of the medium to be tested in the gas flow direction under the new working condition; The Darcy flow resistance of the gas passing through the medium to be detected into the detection cavity under the new working condition; It is the windward area of ​​the medium to be tested under new working conditions.

9. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 8, characterized in that: The weight change pattern of the drying device over time is continuously recorded until the weight of the drying device no longer changes over time, and the dehydration rate of the medium to be tested in the deep dehydration stage is calculated according to the weight change pattern of the drying device over time; The pre-exponential factor and dehydration activation energy of the medium to be detected are calculated using the following formula: ； In the formula, It is the dehydration rate of the unit mass of the medium to be tested in the deep dehydration stage; is the pre-exponential factor; is the dehydration activation energy; R is the thermodynamic constant; T0 is the temperature of the gas passing through the gas inlet.

10. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 9, characterized in that: The dehydration rate of the medium to be tested in the deep dehydration stage under the new working conditions is calculated using the following formula according to the pre-exponential factor and dehydration activation energy of the medium to be tested: ； In the formula, It is the dehydration rate of the unit mass of the medium to be tested in the deep dehydration stage of the new working condition; is the pre-exponential factor; is the dehydration activation energy; R is the thermodynamic constant; T is the temperature of the gas passing through the gas inlet under the new working conditions.

11. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 9, characterized in that: After calculating the pre-exponential factor and dehydration activation energy of the medium to be detected, the dimensionless time of the deep dehydration stage of the medium to be detected under the detection condition is calculated to determine the accuracy of the calculated pre-exponential factor and dehydration activation energy.

12. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 11, characterized in that: The following method is used to determine the accuracy of the calculated pre-exponential factor and dehydration activation energy: The characteristic time scale of the convective transport process is calculated according to the following formula: ； In the formula, is the characteristic time scale of gas flow; d is the average pore size of the sample to be tested; is the average flow rate of gas in the detection chamber; The characteristic time scale of the water desorption process is calculated according to the following formula: ； In the formula, is the characteristic time scale of the water desorption process; is the molar mass of water; The molar amount of water in the unit volume of gas introduced into the detection chamber when it reaches saturation can be obtained by consulting the thermal properties parameter manual; is the pre-exponential factor; is the dehydration activation energy; R is the thermodynamic constant; T0 is the temperature of the gas passing through the gas inlet; The dimensionless time of the deep dehydration stage of the medium to be tested under the test conditions is calculated according to the following formula: ； like Da ≤1, the accuracy of the calculated pre-exponential factor and dehydration activation energy is reliable; if Da >1, the accuracy of the calculated pre-exponential factor and dehydration activation energy is unreliable.

13. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 12, characterized in that: when Da >1, the dehydration rate and Darcy seepage resistance of the medium to be tested in the rapid dehydration stage are re-obtained, and the gas flow rate entering the detection chamber is adjusted to be stable at Q× Da above.

Images