A detection system and analysis method for the intrinsic kinetics law of medium dehydration

Abstract

A detection system and analysis method for the intrinsic kinetics law of medium dehydration, which relates to the field of dehydration rate testing. The analysis method for the intrinsic kinetics law of medium dehydration obtains the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage, calculates the permeability, pre-exponential factor and dehydration activation energy of the medium to be detected based on the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage, and then predicts the dehydration rate of the medium to be detected in other dehydration stages. The detection system and analysis method for the intrinsic kinetics law of medium dehydration respectively use a seepage model and a desorption kinetics model to invert the intrinsic dehydration kinetic parameters of the medium according to the different dehydration mechanism mechanisms in different stages of the medium to be detected, so as to predict the dehydration rate of the medium under different working conditions based on the intrinsic dehydration kinetic parameters of the medium, and solves the problems that the traditional medium dehydration test method can only obtain the apparent dehydration rate and the test results vary with the test conditions and lack universality, etc.

Description

Technical Field

[0001] The present application relates to the field of dehydration rate testing, and more specifically, to a detection system and analysis method for the intrinsic dehydration kinetics law of a medium. Background Art

[0002] The detection of the dehydration characteristics of a medium is a common requirement in many fields such as food, chemical engineering, civil engineering, and environmental protection. The shape of the cumulative water dehydration curve over time in the conventional medium dehydration process is similar to the Langmuir curve within a certain moisture content range. Therefore, the existing methods for characterizing the medium dehydration law mainly calculate the ultimate dehydration amount and desorption constant by fitting the law of moisture content change over time. 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 parameters such as the composition of the drying gas (such as air, carbon dioxide, nitrogen, etc.), temperature, pressure, and flow rate according to 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 are inevitably 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 detection system and analysis method for the intrinsic dehydration kinetics law of a medium, which obtains the intrinsic dehydration kinetic parameters of the medium by using seepage and desorption inversion, so as to predict the dehydration rate of the medium under different working conditions based on the intrinsic dehydration kinetic parameters of the medium.

[0005] The present application is implemented as follows:

[0006] The present application provides a detection system for the intrinsic dehydration kinetics law of a medium, which includes:

[0007] A sample detection reactor, provided with a detection chamber for accommodating the medium to be detected and a gas inlet and a gas outlet respectively communicating with both ends of the detection chamber;

[0008] A flow controller, provided at the gas inlet, for adjusting the gas flow rate through the gas inlet;

[0009] An inlet pressure sensor, for detecting the gas inlet pressure;

[0010] An outlet pressure sensor, for detecting the gas outlet pressure;

[0011] A temperature sensor, for detecting the gas inlet temperature;

[0012] A pair of porous distribution plates are provided in the detection chamber, and one of the porous distribution plates is provided between each of the gas inlet and the gas outlet and both ends of the medium to be detected;

[0013] A drying device is communicated with the gas outlet for drying the gas discharged from the gas outlet;

[0014] A weight detection device is used to detect the weight of the drying device in real time.

[0015] In some alternative embodiments, a sample carrying device is further provided in the detection chamber. The sample carrying device includes two coarse-hole carrying plates provided at both ends of the medium to be detected, and the two porous distribution plates respectively press against the two coarse-hole carrying plates.

[0016] In some alternative embodiments, one-way air-permeable membranes are respectively provided between both ends of the medium to be detected and the two coarse-hole carrying plates. The one-way air-permeable membranes are used to define that the gas moves unidirectionally from the gas inlet towards the gas outlet.

[0017] In some alternative embodiments, a humidity and flow rate detection device connected to the drying device is further included; the humidity and flow rate detection device is used to receive the gas discharged after being dried by the drying device and detect the humidity and flow rate of the gas discharged after being dried by the drying device.

[0018] This application also provides a method for analyzing the intrinsic kinetics law of medium dehydration, which includes the following steps:

[0019] Obtain the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage;

[0020] Calculate 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;

[0021] Obtain the dehydration rate of the medium to be detected in the deep dehydration stage, and calculate the pre-exponential factor and dehydration activation energy of the medium to be detected;

[0022] Calculate the dehydration rate of the medium to be detected in the deep dehydration stage under the new working conditions according to the pre-exponential factor and dehydration activation energy of the medium to be detected.

[0023] In some alternative embodiments, the following method is used to obtain the dehydration rate and Darcy seepage resistance of the medium to be detected in the rapid dehydration stage:

[0024] Pass the gas into the detection chamber through the gas inlet and discharge it from the gas outlet to the drying device for drying. When the gas flow rate into the detection chamber is stable at Q, record the pressures at the gas inlet and the gas outlet respectively as p 11 andp 12 ; Place the medium to be detected with a mass of m 0 into the detection chamber, and then repeat the above steps. Record the pressures at the gas inlet and the gas outlet as p 21 and p 22 respectively, and calculate the Darcy seepage resistance of the medium to be detected: ;

[0025] Record the law of the change of the weight of the drying device over time, and calculate the dehydration rate of the medium to be detected in the rapid dehydration stage according to the law of the change of the weight of the drying device over time.

[0026] In some alternative embodiments, the following formula is used to calculate the permeability of the medium to be detected:

[0027] ;

[0028] 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 in the detection chamber; L is the length of the medium to be detected in the gas flow direction; is the Darcy seepage resistance of the gas passing through the medium to be detected in the detection chamber; is the windward area of the medium to be detected; is the dehydration rate of the medium to be detected in the rapid dehydration stage.

[0029] In some alternative embodiments, after calculating the permeability of the medium to be detected, when the working condition changes, the dehydration rate of the medium to be detected in the rapid dehydration stage under the new working condition is predicted by the following formula:

[0030] ;

[0031] In the formula, is the dehydration rate of the medium to be detected in the rapid dehydration stage under the new working condition; is the permeability of the medium to be detected; is the viscosity of the gas passing through the medium to be detected in the detection chamber under the new working condition; is the length of the medium to be detected in the gas flow direction under the new working condition; is the Darcy seepage resistance of the gas passing through the medium to be detected in the detection chamber under the new working condition; is the windward area of the medium to be detected under the new working condition.

[0032] In some alternative embodiments, the law of the weight change 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 detected in the deep dehydration stage is calculated according to the law of the weight change of the drying device over time;

[0033] The pre-exponential factor and dehydration activation energy of the medium to be detected are calculated using the following formula:

[0034] ;

[0035] In the formula, is the dehydration rate of the medium to be detected per unit mass in the deep dehydration stage; is the pre-exponential factor; is the dehydration activation energy; R is the thermodynamic constant; T 0 is the temperature of the gas passing through the gas inlet.

[0036] In some alternative embodiments, according to 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 using the following formula:

[0037] ;

[0038] In the formula, is the dehydration rate of the medium to be detected per unit mass in the deep dehydration stage under 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 condition.

[0039] In some alternative embodiments, after calculating the pre-exponential factor and dehydration activation energy of the medium to be detected, the dimensionless time of the medium to be detected in the deep dehydration stage under the detection working condition is calculated to judge the accuracy of the calculated pre-exponential factor and dehydration activation energy.

[0040] In some alternative embodiments, the following method is used to judge the accuracy of the calculated pre-exponential factor and dehydration activation energy:

[0041] The characteristic time scale of the convective transport process is calculated according to the following formula:

[0042] ;

[0043] In the formula, is the characteristic time scale of gas flow; d is the average pore diameter of the sample to be detected; is the average flow velocity of the gas in the detection chamber;

[0044] The characteristic time scale of the moisture desorption process is calculated according to the following formula:

[0045] ;

[0046] 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; T 0 is the temperature of the gas passing through the gas inlet;

[0047] 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:

[0048] ;

[0049] 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.

[0050] 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.

[0051] 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

[0052] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0053] Figure 1 Schematic diagram of a partial cross-section of the system for detecting the intrinsic kinetics of medium dehydration provided by the embodiments of the present application;

[0054] Figure 2 Schematic diagram of the structure of the sample loading device in the system for detecting the intrinsic kinetics of medium dehydration provided by the embodiments of the present application when loading the medium to be detected;

[0055] Figure 3 Schematic diagram of the flow of the method for analyzing the intrinsic kinetics of medium dehydration provided by the embodiments of the present application.

[0056] 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 loading device; 210, porous distribution plate; 220, coarse pore loading 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 embodiments

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0058] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application that is claimed, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0059] The following further describes in detail the characteristics and performance of the system and analysis method for detecting the intrinsic kinetics of medium dehydration of the present application in combination with embodiments.

[0060] Such as Figure 1 And Figure 2As shown in the figure, an intrinsic kinetic law detection system for medium dehydration provided by an embodiment of the present application includes a sample detection reactor 100 with a detection chamber 110 provided therein, a sample carrying device 200 provided in the detection chamber 110, a drying device 300, a weight detection device 400, a humidity flow detection device 500, and a data acquisition module 600;

[0061] Among them, a gas inlet 120 and a gas outlet 130 communicating with the detection chamber 110 are respectively provided at the bottom and top of the sample detection reactor 100. 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 rate passing through the gas inlet 120, the inlet pressure sensor 150 is used to detect the gas pressure passing through the gas inlet 120, and the temperature sensor 170 is used to detect the gas temperature passing 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 passing through the gas outlet 130;

[0062] A pair of porous distribution plates 210 for clamping the sample carrying device 200 are provided in the detection chamber 110. A porous distribution plate 210 is respectively provided between the gas inlet 120 and the two ends of the sample carrying device 200 and between the gas outlet 130 and the two ends of the sample carrying device 200. The sample carrying device 200 includes two coarse-hole carrying plates 220 provided at both ends of the medium 700 to be detected. One-way air-permeable membranes 230 are respectively provided between both ends of the medium 700 to be detected and the two coarse-hole carrying plates 220. The one-way air-permeable membranes 230 are used to limit the unidirectional movement of gas from the gas inlet 120 towards the gas outlet 130; the two porous distribution plates 210 respectively press against the two coarse-hole carrying plates 220;

[0063] The drying device 300 is connected to the gas outlet 130 to dry the gas discharged from the gas outlet 130. 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 rate of the gas discharged after drying by the drying device 300; the data acquisition module 600 is respectively 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. 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, the humidity and flow rate detected by the humidity flow detection device 500.

[0064] As Figure 3 shown, an embodiment of the present application also provides an analysis method for the intrinsic kinetic law of medium dehydration, which includes the following steps:

[0065] Step 1. Obtain the dehydration rate and Darcy seepage resistance of the medium 700 to be detected during the rapid dehydration stage;

[0066] Use the above-mentioned intrinsic kinetic law detection system for medium dehydration to conduct tests on the medium 700 to be detected; before putting the medium 700 to be detected into the detection chamber 110, pass the gas through the gas inlet 120 into the detection chamber 110 and discharge it from the gas outlet 130 to the drying device 300 for drying, and when the gas flow rate into the detection chamber 110 is adjusted to be stable at Q by the flow controller 140, record the pressures at the gas inlet 120 and the gas outlet 130 respectively as p 11 and p 12 , and record the gas temperature T passing through the gas inlet 120 0 .

[0067] After putting the medium 700 to be detected with a mass of m 0 into the detection chamber 110, set one-way breathable membranes 230 at both ends of the medium 700 to be detected, set coarse-hole bearing plates 220 on the sides of the two one-way breathable membranes 230 away from the medium 700 to be detected, and set porous distribution plates 210 at the ends of the two coarse-hole bearing plates 220 away from the medium 700 to be detected. Pass the gas through the gas inlet 120 into the detection chamber 110 and discharge it from the gas inlet 120 to the drying device 300 for drying, and when the gas flow rate into the detection chamber 110 is adjusted to be stable at Q by the flow controller 140, record the pressures at the gas inlet 120 and the gas outlet 130 respectively as p 21 and p 22 , and calculate the Darcy seepage resistance : ;

[0068] Record the law of the weight change of the drying device 300 with time, and calculate the dehydration rate of the medium 700 to be detected during the rapid dehydration stage according to the law of the weight change of the drying device 300 with time. Continue to record the law of the weight change of the drying device 300 with time until the weight of the drying device 300 no longer changes with time, and calculate the dehydration rate of the medium 700 to be detected during the deep dehydration stage.

[0069] When recording the law of the weight change of the drying device 300 with 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 rises, the desiccant in the drying device 300 needs to be replaced and the test needs to be restarted.

[0070] Step 2: Calculate the permeability of the medium to be detected 700 based on the dehydration rate and Darcy seepage resistance of the medium to be detected 700 in the rapid dehydration stage;

[0071] The permeability of the medium to be detected 700 is calculated using the following formula:

[0072] ;

[0073] In the formula, is the permeability of the medium to be detected, with the unit of kg / m; is the gas viscosity of the gas passing through the detection chamber 110 and passing through the medium to be detected 700, with the unit of N·s / m 2 ; L is the length of the medium to be detected in the gas flow direction, with the unit of m; is the Darcy seepage resistance of the gas passing through the medium to be detected in the detection chamber, with the unit of Pa; is the windward area of the medium to be detected, with the unit of m 2 ; is the dehydration rate of the medium to be detected in the rapid dehydration stage, with the unit of kg / s.

[0074] When the working condition changes, the dehydration rate of the medium to be detected in the rapid dehydration stage under the new working condition can be predicted by the following formula:

[0075] ;

[0076] In the formula, is the dehydration rate of the medium to be detected in the rapid dehydration stage under the new working condition, with the unit of kg / s; is the permeability of the medium to be detected, with the unit of kg / m; is the gas viscosity of the gas passing through the detection chamber 110 and passing through the medium to be detected under the new working condition, with the unit of N·s / m 2 ; is the length of the medium to be detected in the gas flow direction under the new working condition, with the unit of m; is the Darcy seepage resistance of the gas passing through the medium to be detected in the detection chamber 110 under the new working condition, with the unit of Pa; is the windward area of the medium to be detected under the new working condition, with the unit of m 2 .

[0077] Step 3: Calculate the pre-exponential factor and dehydration activation energy of the medium to be detected using the following formula:

[0078] ;

[0079] In the formula, is the dehydration rate of the medium to be detected per unit mass in the deep dehydration stage, with the unit of 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 0 is the temperature of the gas passing through the gas inlet 120, in K.

[0080] Step 4: Determine the accuracy of the measured pre-exponential factor and dehydration activation energy according to the following method:

[0081] The characteristic time scale of the convective transport process is calculated using the following formula:

[0082] ;

[0083] 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.

[0084] The characteristic time scale of the desorption process is calculated according to the following formula:

[0085] ;

[0086] 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:

[0087] ;

[0088] 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.

[0089] Step 5. When the working condition changes, calculate the dehydration rate of the medium to be detected 700 in the deep dehydration stage under the new working condition according to the pre-exponential factor and dehydration activation energy of the medium to be detected 700:

[0090] ;

[0091] In the formula, is the dehydration rate of the medium to be detected per unit mass in the deep dehydration stage under the new working condition, with the unit of kg / s; is the pre-exponential factor, with the unit of kg / s; is the dehydration activation energy, with the unit of J / mol; R is the thermodynamic constant, with the unit of J / (mol·K); T is the temperature of the gas passing through the gas inlet 120 under the new working condition, with the unit of K.

[0092] The medium dehydration intrinsic kinetic law detection system and analysis method provided by the embodiments of the present application perform tests by setting the sample detection reactor 100 to accommodate the medium to be detected 700 and finely controlling the mass transfer conditions of the dehydration of the medium to be detected 700, obtaining the dehydration rate of the medium to be detected 700 under a specific carrier gas flow intensity, and then, aiming at the different dehydration mechanism principles in different stages of the medium to be detected 700, respectively using the seepage model and desorption kinetic model to inversely obtain the intrinsic dehydration kinetic parameters of the medium to be detected 700, and using the intrinsic dehydration kinetic parameters of the medium to be detected 700 for predicting the rapid dehydration rate and deep dehydration rate of the medium under different working conditions, solving the problems that the traditional medium dehydration test method can only obtain the apparent dehydration rate and the test results vary with the test conditions and lack universality.

[0093] The new working condition described in the embodiments of the present application is to perform dehydration tests on the medium to be detected 700 by changing different gas types, temperature magnitudes, pressure magnitudes, and flow magnitudes. Each time the above test parameters are changed for dehydration tests, it is a new working condition.

[0094] The above-described embodiments are some embodiments of the present application, rather than all embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

Claims

1. A method for analyzing the intrinsic kinetics of medium dehydration, characterized in that: It includes the following steps: Use the medium dehydration intrinsic dynamics law detection system to test the medium to be tested, and 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 tested according to the dehydration rate of the medium to be tested in the rapid dehydration stage and the Darcy seepage resistance, and predicting the dehydration rate of the medium to be tested in the rapid dehydration stage under the new working conditions when the working conditions change; 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; Calculating the dehydration rate of the medium to be tested in the deep dehydration stage under the new working condition according to the pre-exponential factor and dehydration activation energy of the medium to be tested; The medium dehydration intrinsic dynamics law detection system comprises: 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 adjusting 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 method for analyzing the intrinsic kinetics of medium dehydration according to claim 1, 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 method for analyzing the intrinsic kinetics of medium dehydration according to claim 2, 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 method for analyzing the intrinsic kinetics of medium dehydration according to claim 1, 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. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 1, 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 outlet to the drying device for drying. When the gas flow rate into the detection chamber is stable at Q, the pressures 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.

6. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 5, characterized in that: The permeability of the medium to be tested 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.

7. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 6, 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.

8. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 7, 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.

9. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 8, 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.

10. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 8, 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.

11. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 10, 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; T 0 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.

12. The method for analyzing the intrinsic kinetics of medium dehydration according to claim 11, 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.

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