CN108459049B - Device and method for testing thermal stability characteristics of mining foam fluid material - Google Patents
Device and method for testing thermal stability characteristics of mining foam fluid material Download PDFInfo
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Abstract
The invention discloses a device and a method for testing thermal stability characteristics of a mining foam fluid material, wherein the device comprises a constant-temperature heating device, a large beaker, a small beaker, a temperature measuring device and a data processing device; taking the quantity of heat absorbed by the foam fluid material in the same time interval as an index for measuring the thermal stability, when the thermal stability of the foam fluid material reaches a critical point and is damaged along with the increase of the temperature, the quantity of heat absorbed by the foam fluid material is obviously reduced, the characteristic point is called a destabilization critical point, the temperature of the point is called a destabilization critical temperature, the time from the beginning of the experiment to the destabilization critical point is called a destabilization critical time, and the total quantity of heat absorbed by the foam fluid material in the period is called a critical heat absorption quantity; the method obtains the instability critical time and the critical heat absorption capacity of different types of foam fluid materials through measurement, and further obtains the thermal stability characteristics of the different types of foam fluid materials.
Description
Technical Field
The invention relates to a device and a method for testing the characteristics of a foamed fluid material, in particular to a device and a method for testing the thermal stability characteristics of a mining foamed fluid material.
Background
Mine fires are one of the main disasters of coal mines, wherein coal spontaneous combustion fire accidents caused by air leakage of coal rock cracks account for more than 90 percent of the total number of mine fires. Grouting, nitrogen gas injection, foam injection, inhibitor spraying, gel injection, composite colloid injection and other fire prevention and extinguishing technologies are generally adopted at home and abroad to prevent the spontaneous combustion of mine coal. The material has certain effect in the field application process, but has some problems, mainly solving the problem of continuous plugging and inerting of high-temperature coal rock fractures. The foam plugging material has the characteristics of good crack permeability, high accumulation, three-dimensional coverage and the like, and is more and more concerned by scholars at home and abroad in recent years. The foam fire-preventing and extinguishing materials commonly used in coal mines at present mainly comprise inert gas foam, inhibition foam, gel foam, three-phase foam, foam mortar and the like, but the thermal stability of the materials is the most critical characteristic in the actual process of preventing and controlling the fracture of the high-temperature coal rock on site. Therefore, it is necessary to develop a method for testing the thermal stability of the foam material.
At present, the thermal stability characteristic test of the material has some determination principles, methods and experimental devices in some application fields, and also forms some national standards and determination specifications of the thermal stability characteristic test of the material, for example, the thermal stability performance of the polyformaldehyde is determined by a color development method; the thermal stability of PVC materials is reflected by the thermal stability of certain products released by the material when heated. The foamed fluid material is different from the polyformaldehyde and PVC material in nature, mainly because the foamed fluid material belongs to a solid, liquid and gas three-phase mixture and is a heterogeneous material, and the accelerated liquid drainage of a foamed carrier liquid film and the pressure change of a gas medium in a bubble air affect the stability of the foamed fluid under the heating condition. There is no heat release material and no compositional change during the entire heating process. Therefore, the foamed fluid cannot be tested by the method for testing the stability of the polyformaldehyde and PVC materials. The current testing method for the thermal stability characteristics of the foam fluid is still blank.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for testing the thermal stability of a mining foam fluid material.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a mining foam fluid material thermal stability characteristic testing arrangement, includes constant temperature heating device, big beaker, little beaker, temperature measuring device and data processing device, is equipped with the asbestos net on the constant temperature heating device, and big beaker is placed on the asbestos net, and inside little beaker was in big beaker, temperature measuring device is two thermocouples, and two thermocouples are placed respectively in big beaker and little beaker, and two thermocouples all are connected with data processing device, and the upper end of big beaker is equipped with the heat insulating board.
Further, the data processing device is a computer.
Further, the constant temperature heating device is a constant temperature heating instrument.
A method for testing the thermal stability of a mining foam fluid material comprises the following specific steps:
(1) detecting one of the foam fluid materials by using a differential scanning calorimeter to obtain a DSC curve of the foam fluid material, and then drawing a curve graph of the specific heat capacity of the foam fluid material along with the temperature change characteristic according to the DSC curve;
(2) the thermal insulation plate is opened, the foam fluid material is placed in a small beaker in a mining foam fluid material thermal stability characteristic testing device, then soybean oil is injected into the large beaker, the liquid level of the soybean oil is higher than the liquid level of the foam fluid material, the foam fluid material can be in an environment of uniform heating due to the arrangement mode, the influence of non-uniformity of heat conduction and heat dissipation of the large beaker on experimental data can be reduced due to the fact that the liquid level of the soybean oil is higher than the liquid level of the foam fluid material, and the thermal insulation plate is placed at the upper end of the large beaker after the thermal insulation plate is completed;
(3) starting a constant temperature heating instrument to uniformly heat the soybean oil in the big beaker from room temperature, and detecting the temperature of the soybean oil in real time by a thermocouple in the big beaker and feeding the temperature back to the data processing device;
(4) the data processing device controls thermocouples in the small beaker to measure the temperature T of the foam fluid material at the same interval, obtains the temperature variation delta T in each interval time period according to the measured temperature T values, combines a curve of specific heat capacity along with the temperature variation, calculates the heat absorption data of the foam fluid material by adopting the following formula, and finally fits a curve graph of the heat absorption quantity of the foam fluid material along with the time variation by the data processing device;
ΔQp＝CpmΔT
in the formula: delta QPIs the heat in adjacent time periods, CpThe foam fluid isobaric specific heat capacity is provided, m is the foam fluid sample mass, and delta T is the temperature variation in an interval time period;
(5) selecting different kinds of foam fluid materials to repeat the steps (1) to (4) to obtain a curve graph of the change of the heat absorption capacity of the various foam fluid materials along with time;
(6) the data processing device generates a discrete point diagram of each experimental data point X according to the curve graph of the change of the heat absorption capacity of the foam fluid material along with time;
(7) performing quadratic curve fitting by adopting the following function formula to obtain a fitting curve Y;
Q＝K1t2+K2t+K3
in the formula: q is the heat absorption capacity of the foam fluid material, and t is the heat absorption time of the foam fluid material; parameter K1、K2、K3The specific calculation process is as follows:
fitting the data by least square method, and setting f (x) as primitive function, g (x) as approximate function, and (x)i，f(xi) (i ═ 1, …, n) are data points such that g (x):
known experimental data points (x) as described abovei，yi) (i-1, …, n) using a quadratic function Q-K1t2+K2t+K3Making an approximate fit curve and making the mean square error be
from this, the parameter K is derived1、K2、K3A value of (d);
(8) connecting the starting point A and the stopping point B of the fitting curve Y into a straight line AB, obtaining the slope K of the straight line AB, and obtaining a tangent Z by utilizing the Langerhans' median theorem that the tangent of a point on the curve is equal to the slope of the straight line AB;
(9) the tangent point of the tangent line Z and the fitting curve Y is the instability critical point, and the corresponding abscissa time is the instability critical time Tc；
(10) From the initial time to the instability critical time TcWithin range to fitted curve YIntegration is performed (i.e. fitting curve Y and destabilization critical time T in FIG. 2)cTotal area of the regions of composition) to obtain the critical heat absorption Q of various foam fluid materialsc；
(11) According to the obtained instability critical time T of various foam fluid materialscAnd critical heat absorption capacity QcAnd determining the thermal stability characteristics of various foam fluid materials.
Compared with the prior art, the invention adopts the instability critical time and critical heat absorption capacity of the foam fluid material, takes the quantity of heat absorbed by the foam fluid material in the same time interval as an index for measuring the thermal stability characteristic, when the thermal stability characteristic of the foam fluid material reaches a critical point and is destroyed along with the increase of the temperature, the heat absorbed by the foam fluid material is obviously reduced, the characteristic point is called the instability critical point, the temperature of the point is called the instability critical temperature, the time from the beginning of the experiment to the instability critical point is called the instability critical time, and the total heat absorbed by the foam fluid material in the period is called the critical heat absorption capacity; the method obtains the instability critical time and the critical heat absorption capacity of different types of foam fluid materials through measurement, and further obtains the thermal stability characteristics of the different types of foam fluid materials.
Drawings
FIG. 1 is a schematic diagram of the structure of the testing device of the present invention;
FIG. 2 is a graph of the heat absorption of the foamed fluid material of the present invention as a function of temperature;
FIG. 3 is a graph of the endothermic heat as a function of temperature for the inorganic curable foam fluid of example 1;
FIG. 4 is a graph of the endothermic heat change with temperature for the gel foam fluid of example 2;
FIG. 5 is a graph of the endothermic heat change with temperature for a three-phase foamed fluid in example 3;
FIG. 6 is a graph of the endotherm of the AB component foam fluid of example 4 as a function of temperature.
In the figure: 1. the device comprises a heat insulation plate, 2, a large beaker, 3, a small beaker, 4, a constant temperature heating instrument, 5 and a temperature measuring device.
Detailed Description
The present invention will be further explained below.
As shown in figure 1, the mining foam fluid material thermal stability characteristic testing device comprises a constant temperature heating device, a large beaker 2, a small beaker 3, a temperature measuring device 5 and a data processing device, wherein an asbestos net is arranged on the constant temperature heating device, the large beaker 2 is placed on the asbestos net, the small beaker 3 is positioned inside the large beaker 2, the temperature measuring device 5 is two thermocouples, the two thermocouples are respectively placed in the large beaker 2 and the small beaker 3, the two thermocouples are both connected with the data processing device, and a heat insulation plate 1 is arranged at the upper end of the large beaker 2.
Further, the data processing device is a computer.
Further, the constant temperature heating device is a constant temperature heating instrument 4.
Example 1:
the method for testing the thermal stability of the inorganic curing foam fluid material comprises the following specific steps:
(1) detecting the inorganic curing foam fluid material by using a differential scanning calorimeter to obtain a DSC curve of the inorganic curing foam fluid material, and then drawing a curve graph of the specific heat capacity of the inorganic curing foam fluid material along with the temperature change characteristic according to the DSC curve;
(2) opening the heat insulation plate 1, placing the inorganic solidified foam fluid material in a small beaker 3 in a mine foam fluid material thermal stability characteristic testing device, then injecting soybean oil into a large beaker 2, and enabling the liquid level of the soybean oil to be higher than that of the inorganic solidified foam fluid material, and placing the heat insulation plate 1 at the upper end of the large beaker 2 after completion;
(3) starting a constant temperature heating instrument 4 to uniformly heat the soybean oil in the big beaker 2 from room temperature, and detecting the temperature of the soybean oil in real time by a thermocouple in the big beaker 2 and feeding the temperature back to the data processing device;
(4) the data processing device controls a thermocouple in the small beaker 3 to measure the temperature T of the inorganic curing foam fluid material every 3 minutes, obtains the temperature variation delta T in each interval time period according to each measured temperature T value, combines a curve of specific heat capacity along with temperature variation, calculates the heat absorption data of the inorganic curing foam fluid material by adopting the following formula, and finally fits a curve graph of the change of the heat absorption of the inorganic curing foam fluid material along with time by the data processing device;
ΔQp＝CpmΔT
in the formula: delta QPIs the heat in adjacent time periods, CpThe foam fluid isobaric specific heat capacity is obtained, m is the sample mass of the inorganic solidified foam fluid material, and delta T is the temperature variation in an interval time period;
(5) the data processing device generates a discrete point diagram of each experimental data point X according to a curve graph of the heat absorption quantity of the inorganic solidified foam fluid material along with the time;
(6) performing quadratic curve fitting by adopting the following function formula to obtain a fitting curve Y;
Q＝K1t2+K2t+K3
in the formula: q is the heat absorption capacity of the foam fluid material, and t is the heat absorption time of the foam fluid material; parameter K1、K2、K3The specific calculation process is as follows:
fitting the data by least square method, and setting f (x) as primitive function, g (x) as approximate function, and (x)i，f(xi) (i ═ 1, …, n) are data points such that g (x):
known experimental data points (x) as described abovei，yi) (i-1, …, n) using a quadratic function Q-K1t2+K2t+K3Making an approximate fit curve and making the mean square error be
from this, the parameter K is derived1、K2、K3Values of-2.41, 37.45, 797.38, respectively;
(8) connecting the starting point A and the stopping point B of the fitting curve Y into a straight line AB, obtaining the slope K of the straight line AB, and obtaining a tangent Z by utilizing the Langerhans' median theorem that the tangent of a point on the curve is equal to the slope of the straight line AB;
(9) the tangent point of the tangent line Z and the fitting curve Y is the instability critical point, and the corresponding abscissa time is the instability critical time Tc；
(10) From the initial time to the instability critical time TcIntegrating the fitted curve Y in the range to obtain the critical heat absorption Q of the inorganic curing foam fluid materialc；
(11) According to the obtained instability critical time T of the inorganic curing foam fluid materialcAnd critical heat absorption capacity Qc(as shown in fig. 3), the thermal stability characteristics of the inorganic cured foam fluid material were determined.
Example 2:
the method for testing the thermal stability of the gel foam fluid material comprises the following specific steps:
(1) detecting the gel foam fluid material by using a differential scanning calorimeter to obtain a DSC curve of the gel foam fluid material, and then drawing a curve graph of the specific heat capacity of the gel foam fluid material along with the temperature change characteristic according to the DSC curve;
(2) opening the heat insulation plate 1, placing the gel foam fluid material in a small beaker 3 in a mining foam fluid material thermal stability characteristic testing device, then injecting soybean oil into a large beaker 2, and enabling the liquid level of the soybean oil to be higher than that of the gel foam fluid material, and placing the heat insulation plate 1 at the upper end of the large beaker 2 after the completion;
(3) starting a constant temperature heating instrument 4 to uniformly heat the soybean oil in the big beaker 2 from room temperature, and detecting the temperature of the soybean oil in real time by a thermocouple in the big beaker 2 and feeding the temperature back to the data processing device;
(4) the data processing device controls a thermocouple in the small beaker 3 to measure the temperature T of the gel foam fluid material every 3 minutes, obtains the temperature variation delta T in each interval time period according to each measured temperature T value, combines a curve of specific heat capacity along with temperature variation, calculates the heat absorption data of the gel foam fluid material by adopting the following formula, and finally fits a curve graph of the heat absorption of the gel foam fluid material along with the time variation by the data processing device;
ΔQp＝CpmΔT
in the formula: delta QPIs the heat in adjacent time periods, CpThe constant pressure specific heat capacity of the foam fluid is shown, m is the mass of a sample of the gel foam fluid material, and delta T is the temperature variation in an interval time period;
(5) the data processing device generates a discrete point diagram of each experimental data point X according to the curve graph of the change of the heat absorption quantity of the gel foam fluid material along with time;
(6) performing quadratic curve fitting by adopting the following function formula to obtain a fitting curve Y;
Q＝K1t2+K2t+K3
in the formula: q is the heat absorption capacity of the foam fluid material, and t is the heat absorption time of the foam fluid material; parameter K1、K2、K3The specific calculation process is as follows:
fitting the data by least square method, and setting f (x) as primitive function, g (x) as approximate function, and (x)i，f(xi) (i ═ 1, …, n) are data points such that g (x):
known experimental data points (x) as described abovei，yi) (i-1, …, n) using a quadratic function Q-K1t2+K2t+K3Making an approximate fit curve and making the mean square error be
from this, the parameter K is derived1、K2、K3Values of-1.96, 17.75, 877.98, respectively;
(8) connecting the starting point A and the stopping point B of the fitting curve Y into a straight line AB, obtaining the slope K of the straight line AB, and obtaining a tangent Z by utilizing the Langerhans' median theorem that the tangent of a point on the curve is equal to the slope of the straight line AB;
(9) the tangent point of the tangent line Z and the fitting curve Y is the instability critical point, and the corresponding abscissa time is the instability critical time Tc；
(10) From the initial time to the instability critical time TcIntegrating the fitted curve Y in the range to obtain the critical heat absorption Q of the gel foam fluid materialc；
(11) According to the obtained buckling critical time T of the gel foam fluid materialcAnd critical heat absorption capacity Qc(as shown in fig. 4), the thermal stability characteristics of the gel foam fluid material were determined.
Example 3:
the method for testing the thermal stability of the three-phase foam fluid material comprises the following specific steps:
(1) detecting the three-phase foam fluid material by using a differential scanning calorimeter to obtain a DSC curve of the three-phase foam fluid material, and then drawing a curve graph of the specific heat capacity of the three-phase foam fluid material along with the temperature change characteristic according to the DSC curve;
(2) opening the heat insulation plate 1, placing the three-phase foam fluid material in a small beaker 3 in a mine foam fluid material thermal stability characteristic testing device, then injecting soybean oil into a large beaker 2, and enabling the liquid level of the soybean oil to be higher than that of the three-phase foam fluid material, and placing the heat insulation plate 1 at the upper end of the large beaker 2 after completion;
(3) starting a constant temperature heating instrument 4 to uniformly heat the soybean oil in the big beaker 2 from room temperature, and detecting the temperature of the soybean oil in real time by a thermocouple in the big beaker 2 and feeding the temperature back to the data processing device;
(4) the data processing device controls a thermocouple in the small beaker 3 to measure the temperature T of the three-phase foam fluid material every 3 minutes, obtains the temperature variation delta T in each interval time period according to each measured temperature T value, combines a curve of specific heat capacity along with temperature variation, calculates the heat absorption data of the three-phase foam fluid material by adopting the following formula, and finally fits a curve graph of the heat absorption quantity of the three-phase foam fluid material along with the time variation by the data processing device;
ΔQp＝CpmΔT
in the formula: delta QPIs the heat in adjacent time periods, CpThe foam fluid isobaric specific heat capacity is obtained, m is the mass of a three-phase foam fluid material sample, and delta T is the temperature variation in an interval time period;
(5) the data processing device generates a discrete point diagram of each experimental data point X according to a curve graph of the heat absorption quantity of the three-phase foam fluid material along with the time change;
(6) performing quadratic curve fitting by adopting the following function formula to obtain a fitting curve Y;
Q＝K1t2+K2t+K3
in the formula: q is the heat absorption capacity of the foam fluid material, and t is the heat absorption time of the foam fluid material; parameter K1、K2、K3The specific calculation process is as follows:
fitting the data by least square method, and setting f (x) as primitive function, g (x) as approximate function, and (x)i，f(xi) (i ═ 1, …, n) are data points such that g (x):
known experimental data points (x) as described abovei，yi) (i-1, …, n) using a quadratic function Q-K1t2+K2t+K3Making an approximate fit curve and making the mean square error be
from this, the parameter K is derived1、K2、K3Values of-1.19, 14.71, 1124.05, respectively;
(8) connecting the starting point A and the stopping point B of the fitting curve Y into a straight line AB, obtaining the slope K of the straight line AB, and obtaining a tangent Z by utilizing the Langerhans' median theorem that the tangent of a point on the curve is equal to the slope of the straight line AB;
(9) the tangent point of the tangent line Z and the fitting curve Y is the instability critical point, and the corresponding abscissa time is the instability critical time Tc；
(10) From the initial time to the instability critical time TcIntegrating the fitting curve Y in the range to obtain the critical heat absorption capacity Q of the three-phase foam fluid materialc；
(11) According to the obtained instability critical time T of the three-phase foam fluid materialcAnd critical heat absorption capacity Qc(as shown in fig. 5), the thermal stability characteristics of the three-phase foamed fluid material were determined.
Example 4:
the method for testing the thermal stability of the AB component foam fluid material comprises the following specific steps:
(1) detecting the AB component foam fluid material by using a differential scanning calorimeter to obtain a DSC curve of the AB component foam fluid material, and then drawing a curve chart of the change characteristic of the specific heat capacity of the AB component foam fluid material along with the temperature according to the DSC curve;
(2) opening the heat insulation plate 1, placing the AB component foam fluid material in a small beaker 3 in a mine foam fluid material thermal stability characteristic testing device, then injecting soybean oil into a large beaker 2, and enabling the liquid level of the soybean oil to be higher than that of the AB component foam fluid material, and placing the heat insulation plate 1 at the upper end of the large beaker 2 after completion;
(3) starting a constant temperature heating instrument 4 to uniformly heat the soybean oil in the big beaker 2 from room temperature, and detecting the temperature of the soybean oil in real time by a thermocouple in the big beaker 2 and feeding the temperature back to the data processing device;
(4) the data processing device controls a thermocouple in a small beaker 3 to measure the temperature T of the AB component foam fluid material every 3 minutes, obtains the temperature variation delta T in each interval time period according to each measured temperature T value, combines a curve of the specific heat capacity along with the temperature variation, calculates the heat absorption data of the AB component foam fluid material by adopting the following formula, and finally fits a curve graph of the heat absorption quantity of the AB component foam fluid material along with the time variation by the data processing device;
ΔQp＝CpmΔT
in the formula: delta QPIs the heat in adjacent time periods, CpThe foam fluid isobaric specific heat capacity is obtained, m is the sample mass of the AB component foam fluid material, and delta T is the temperature variation in an interval time period;
(5) the data processing device generates a discrete point diagram of each experimental data point X according to a curve graph of the endothermic quantity of the AB component foam fluid material along with the time;
(6) performing quadratic curve fitting by adopting the following function formula to obtain a fitting curve Y;
Q＝K1t2+K2t+K3
in the formula: q is the heat absorption capacity of the foam fluid material, and t is the heat absorption time of the foam fluid material; parameter K1、K2、K3The specific calculation process is as follows:
fitting the data by least square method, and setting f (x) as primitive function, g (x) as approximate function, and (x)i，f(xi) (i ═ 1, …, n) are data points such that g (x):
known experimental data points (x) as described abovei，yi) (i-1, …, n) using a quadratic function Q-K1t2+K2t+K3Making an approximate fit curve and making the mean square error be
from this, the parameter K is derived1、K2、K3The values of (a) are-3.51, 27.2, 917.86, respectively;
(8) connecting the starting point A and the stopping point B of the fitting curve Y into a straight line AB, obtaining the slope K of the straight line AB, and obtaining a tangent Z by utilizing the Langerhans' median theorem that the tangent of a point on the curve is equal to the slope of the straight line AB;
(9) the tangent point of the tangent line Z and the fitting curve Y is the instability thresholdPoint, the corresponding abscissa time of which is the instability critical time Tc；
(10) From the initial time to the instability critical time TcIntegrating the fitting curve Y in the range to obtain the critical heat absorption Q of the AB component foam fluid materialc；
(11) According to the obtained instability critical time T of the AB component foam fluid materialcAnd critical heat absorption capacity Qc(as shown in fig. 6), the thermal stability characteristics of the AB component foam fluid material were determined.
Claims (2)
1. The mining foam fluid material thermal stability characteristic testing method is characterized in that the adopted mining foam fluid material thermal stability characteristic testing device comprises a constant temperature heating device, a large beaker, a small beaker, a temperature measuring device (5) and a data processing device, an asbestos net is arranged on the constant temperature heating device, the large beaker (2) is placed on the asbestos net, the small beaker (3) is located inside the large beaker (2), the temperature measuring device is two thermocouples, the two thermocouples are respectively placed in the large beaker (2) and the small beaker (3), the two thermocouples are both connected with the data processing device, the upper end of the large beaker (2) is provided with a heat insulation board (1), the constant temperature insulation board heating device is a constant temperature heating instrument (4), and the concrete steps are as follows:
(1) detecting one of the foam fluid materials by using a differential scanning calorimeter to obtain a DSC curve of the foam fluid material, and then drawing a curve graph of the specific heat capacity of the foam fluid material along with the temperature change characteristic according to the DSC curve;
(2) opening the heat insulation plate (1), placing the foamed fluid material in a small beaker (3) in a mining foamed fluid material thermal stability characteristic testing device, then injecting soybean oil into a large beaker (2), enabling the liquid level of the soybean oil to be higher than that of the foamed fluid material, and placing the heat insulation plate (1) at the upper end of the large beaker (2) after completion;
(3) starting a constant temperature heating instrument (4) to uniformly heat the soybean oil in the big beaker (2) from room temperature, and detecting the temperature of the soybean oil in real time by a thermocouple in the big beaker (2) and feeding the temperature back to the data processing device;
(4) the data processing device controls a thermocouple in a small beaker (3) to measure the temperature T of the foam fluid material at the same interval, obtains the temperature variation delta T in each interval time period according to the measured temperature T values, combines a curve of the specific heat capacity along with the temperature variation, calculates the heat absorption data of the foam fluid material by adopting the following formula, and finally fits a curve chart of the heat absorption quantity along with the time variation of the foam fluid material by the data processing device;
ΔQp＝CpmΔT
in the formula: delta QPIs the heat in adjacent time periods, CpThe foam fluid isobaric specific heat capacity is provided, m is the foam fluid sample mass, and delta T is the temperature variation in an interval time period;
(5) selecting different kinds of foam fluid materials to repeat the steps (1) to (4) to obtain a curve graph of the change of the heat absorption capacity of the various foam fluid materials along with time;
(6) the data processing device generates a discrete point diagram of each experimental data point X according to the curve graph of the change of the heat absorption capacity of the foam fluid material along with time;
(7) performing quadratic curve fitting by adopting the following function formula to obtain a fitting curve Y;
Q＝K1t2+K2t+K3
in the formula: q is the heat absorption capacity of the foam fluid material, and t is the heat absorption time of the foam fluid material; parameter K1、K2、K3The specific calculation process is as follows:
fitting the data by least square method, and setting f (x) as primitive function, g (x) as approximate function, and (x)i，f(xi) (i ═ 1, …, n) are data points such that g (x):
known experimental data points (x) as described abovei，yi) (i-1, …, n) using a quadratic function Q-K1t2+K2t+K3Making an approximate fit curve and making the mean square error be
from this, the parameter K is derived1、K2、K3A value of (d);
(8) connecting the starting point A and the stopping point B of the fitting curve Y into a straight line AB, obtaining the slope K of the straight line AB, and obtaining a tangent Z by utilizing the Langerhans' median theorem that the tangent of a point on the curve is equal to the slope of the straight line AB;
(9) the tangent point of the tangent line Z and the fitting curve Y is the instability critical point, and the corresponding abscissa time is the instability critical time Tc；
(10) From the initial time to the instability critical time TcIntegrating the fitted curve Y in the range to obtain the critical heat absorption capacity Q of various foam fluid materialsc；
(11) According to the obtained instability critical time T of various foam fluid materialscAnd critical heat absorption capacity QcAnd determining the thermal stability characteristics of various foam fluid materials.
2. The method for testing the thermal stability of the mining foam fluid material according to claim 1, wherein the data processing device is a computer.
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