CN114002112B - Spray type coal rock contact angle measuring device and method - Google Patents
Spray type coal rock contact angle measuring device and method Download PDFInfo
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- CN114002112B CN114002112B CN202111305323.8A CN202111305323A CN114002112B CN 114002112 B CN114002112 B CN 114002112B CN 202111305323 A CN202111305323 A CN 202111305323A CN 114002112 B CN114002112 B CN 114002112B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
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Abstract
The invention discloses a spray type coal rock contact angle measuring device and a method, and the device comprises a spraying device, a rotating device, a liquid pumping device, a burette device and a contact angle measuring instrument, wherein the rotating device is fixedly arranged above a support frame; the method comprises the steps of uniformly spraying a surfactant solution on the surface of a coal sample in a small amount through atomization, rotating a titration device after drying treatment, and measuring the contact angle of the surface of the coal sample by using a contact angle measuring instrument. The invention has scientific principle, reasonable structure and convenient operation, realizes the function of integrating spraying, drying and titration of the coal sample, and has the advantages of quick drying time of the coal sample, less medicament dosage, small expansion deformation and convenient and simple operation.
Description
Technical Field
The invention relates to a device and a method for measuring a contact angle of a coal sample or a rock sample, in particular to a device and a method for measuring a spray type coal rock contact angle.
Background
Water lock damage is caused by capillary action when an external invading liquid enters into the pore-fissures inside the coal body, and the severity of the water lock damage is influenced by the wettability of the surface of the coal sample. The mine dust fall can improve the underground operation environment, has an extremely important function on reducing occupational diseases such as pneumoconiosis and silicosis, and the dust fall effect and the difficulty degree are also influenced by the surface wettability of the coal sample. Changing the wettability of the coal sample surface by using a surfactant is an important way and mode for eliminating water lock damage and improving the dust settling effect.
The change of the wettability of the coal sample surface can be visually presented by measuring the contact angle and the surface tension. Therefore, in order to quantitatively analyze the influence of the surfactant solution on the wettability change of the coal sample under different types and concentration conditions, the optimal use concentration and type of the surfactant solution are preferably determined and determined. The contact angle and surface tension measurement is a crucial link, and the contact angle measuring instrument is an essential instrument in the process of measuring the two parameters.
At present, the main methods for measuring the contact angle are a soaking method and a direct titration method, and the two methods have respective defects and application ranges. The soaking method is mainly applied to the measurement of raw coal samples with larger firmness coefficients, and when the contact angle measurement is carried out on coal samples with low firmness coefficients, the problems that the raw coal drilling and cutting difficulty is large, the success rate is low, the time required for soaking and drying the coal samples is long, the dosage of a surfactant is large, the utilization rate is low and the like exist; the direct titration method is applied to the measurement of a coal sample of a briquette, realizes the measurement of the contact angle of the coal sample with low firmness coefficient, but has the problems of complicated and complicated operation, interference of water on the experimental measurement result, expansion deformation, short and unstable retention time, incapability of measuring a hydrophobic surfactant solution and the like when the briquette is measured.
Disclosure of Invention
The invention provides a spray type coal rock contact angle measuring device and a spray type coal rock contact angle measuring method, aiming at the problems and limitations of the existing method that the measuring range is narrow, the soaking and drying time is long, the dosage of a medicament is large, the operation is complicated, the error of an experimental result is large and the like in the contact angle measuring process.
In order to solve the above problems, the present invention provides the following technical solutions:
the utility model provides a pair of atomizing coal petrography contact angle survey device, which comprises a tray, the coal sample, atomizer, the buret, the support frame, distilled water, surfactant solution and contact angle measuring apparatu, rotary device fixed mounting is in the support frame top, 1# pump liquid device passes through the spraying tube coupling with the three-way valve and installs on the support frame in proper order, the distillation straw communicates with survey liquid straw through three-way valve and spraying tube, 2# pump liquid device is installed to the three-way valve below and by distillation straw interconnect.
The spraying device is formed by combining a support frame, a spraying pipeline and an atomizing nozzle, the spraying pipeline is arranged in the support frame, and the atomizing nozzle is connected at the outlet of the spraying pipeline.
Preferably, the spraying device atomizes the measured surfactant solution through the atomizing nozzle, and uniformly and slightly sprays the surfactant solution on the surface of the coal sample to be measured, so that the problem that the titration solution is measured on the surface of the coal sample subjected to expansion deformation due to the fact that the surface of the briquette absorbs excessive water and further influences the experimental measurement result is avoided.
Preferably, the atomized coal sample is placed in a drying oven for drying and cooling, and the water in the hydrophobic surfactant solution is removed through evaporation, so that the interference of the water in the surfactant solution on the experimental result is avoided, and the cleaning work of the titration device after titration by the surfactant solution is reduced; meanwhile, surfactant molecules are retained on the surface of the coal sample to form a hydrophobic protective film, and the contact angle formed by the titration liquid on the surface of the coal sample is long in existence time and stable, so that the contact angle can be measured easily.
Preferably, when the coal sample is subjected to atomization treatment, the dosage of the surfactant solution is less, and the surfactant solution is not in direct contact with the coal sample, so that the pollution of the coal sample to the surfactant solution in a soaking method is reduced, and the coal sample can be used for multiple times; the method only sprays the water solution on the surface of the coal sample to be titrated, so that the drying time is short, and the contact angle measurement efficiency is improved.
The titration device is formed by combining a titration needle head, a titration tube, titration liquid and a push rod with a piston, and the titration tube is fixed on the support frame through a clamp holder; the rotating device connects the spraying device on the left side of the supporting frame with the titration device on the right side of the supporting frame, so that the rotation of the two groups of devices can be realized; the liquid pumping device comprises a 1# liquid pumping device and a 2# liquid pumping device, the 1# liquid pumping device is located below the rotating device, the 2# liquid pumping device is located below the three-way valve, surface shells of the 2# liquid pumping device have high elasticity and compressibility, and the liquid pumping device is internally composed of a liquid inlet one-way valve, a liquid outlet one-way valve and a spring.
Preferably, the liquid outlet one-way valve is arranged above the inside of the liquid pumping device, and the liquid inlet one-way valve is arranged below the inside of the device; the spring is arranged in the middle of the inside of the device, and plays an auxiliary role in the recovery stage after the liquid pumping device is extruded, so that the liquid pumping device can be quickly recovered to the initial state before extrusion, and the liquid pumping efficiency is improved. The surface shell of the liquid pumping device has stronger elasticity and compressibility, when the liquid pumping device is extruded, the internal space of the device is reduced, the pressure is increased, and the liquid flows out of the liquid outlet one-way valve and then flows into an upper spraying pipeline or a three-way valve; at the recovery stage after extrusion, the liquid pumping device is quickly recovered to the initial state before extrusion under the assistance of atmospheric pressure and a spring, at the moment, the internal space of the device is increased, the pressure is reduced, liquid flows in through a liquid inlet one-way valve, and distilled water or surfactant solution below the liquid pumping device is sucked into the liquid pumping device.
The three-way valve is positioned above the No. 2 liquid pumping device and is arranged on the supporting frame, and the interface of the three-way valve is sequentially connected with the spraying pipeline, the distillation suction pipe and the measuring liquid suction pipe to respectively communicate the No. 1 liquid pumping device, the distilled water and the measuring liquid. Wherein the determination solution is a surfactant solution under a certain concentration condition; the No. 2 pump liquid device can be used as a limiting device and a power device which only allow distilled water to flow out in a single direction, and is mainly used for cleaning the measuring liquid suction pipe; the distilled water is used for cleaning devices such as a 1# pump liquid device, a spraying pipeline, a spraying device and a measuring liquid suction pipe, the disassembly and the assembly of the cleaning work are reduced, and the working efficiency is improved.
The contact angle measuring instrument consists of a high-speed camera and a computer provided with contact angle measuring software. The high-speed camera shoots the titration process of the titration liquid on the surface of the coal sample and the change condition of the contact angle, and the contact angle measurement software arranged on the computer is used for measuring and calculating to obtain the more accurate contact angle.
The technical scheme of the invention also provides a method for measuring the spray type coal rock contact angle, which comprises the following steps:
s001, rotating a rotary switch on a three-way valve to communicate a liquid measuring suction pipe with a spray pipeline;
s002, placing the coal sample below the spraying device, and enabling the atomizing nozzle to be opposite to the surface of the coal sample;
s003, extruding and releasing the No. 1 pump liquid device for multiple times, wherein the measured surfactant solution enters the No. 1 pump liquid device through a liquid inlet one-way valve and is sprayed out from an atomizing nozzle through a spraying pipeline, and the atomized surfactant solution is uniformly sprayed on the surface of the coal sample;
s004, placing the atomized coal sample in a drying box for drying, taking out and cooling;
s005, opening the contact angle measuring instrument, and placing the coal sample at a proper position where the high-speed camera can shoot;
s006 adjusts the rotating device and the clamp holder, adjusts the titration apparatus right above the coal sample, and ensures that the liquid outlet of the titration needle and the surface of the coal sample are in the shooting range of the high-speed camera;
s007 slowly pushes a push rod with a piston, and a titration solution in a titration tube forms a liquid drop which is continuously enlarged at a titration needle head until the titration solution drops on the surface of a coal sample and forms a certain angle on the surface of the coal sample;
s008, shooting the titration solution on the whole process of coal surface contact by using a contact angle measuring instrument to form hundreds of shot images, selecting clear and stable images from the shot images, and measuring and calculating a contact angle by using software, wherein at the moment, the contact angle of the surfactant solution with the concentration on the surface of the coal sample is determined to be finished;
s009, rotating a rotary switch on the three-way valve to communicate the distillation suction pipe with the spray pipeline;
s010 carries out extrusion and release on the No. 1 pump liquid device for multiple times again, and the measurement liquid retained in the spraying device and the No. 1 pump liquid device is cleaned and removed, so that the influence on the next group of experiment results is avoided;
s011, rotating a rotary switch on the three-way valve again, communicating the distillation suction pipe with the measuring liquid suction pipe, extruding and releasing the 2# pump liquid device for multiple times, and flushing the surfactant solution retained in the measuring liquid suction pipe;
s012 removing the measured liquid after the measurement, inserting a measured liquid suction pipe into the liquid to be measured, and converting the liquid to be measured into the measured liquid;
s013 repeating the steps, and measuring the contact angle of the surface of the next group of coal samples;
s014, the contact angles of the surfaces of the coal samples treated by the surfactant solutions with different concentrations and types are measured and recorded, and the data of the measured contact angles are collated, analyzed and summarized.
Due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
(1) When the spray type coal rock contact angle measuring method is used for measuring, the measuring range of the contact angle is wide, the method is suitable for measuring the contact angle of raw coal and coal samples of molded coal, and the problems that the coal sample is difficult to drill and take and the success rate is low when the coal sample with low firmness coefficient and the contact angle cannot be measured by a direct titration method due to the fact that the titration solution exists on the surface of the coal sample for a short time and is unstable are solved.
(2) The atomizing nozzle is arranged in the spraying device, the surfactant solution is uniformly and slightly sprayed on the surface of the measured coal sample, the dosage of the medicament is small, the deformation of the coal sample is small, the soaking and drying time is short, the error of the experimental result is reduced, and the contact angle measuring efficiency and accuracy are improved.
(3) According to the invention, the three-way valve and the liquid pumping device are utilized to carry out liquid pumping, spraying, titration and cleaning operations of an experiment, repeated disassembly and replacement are not required, the cleaning workload of the experiment device is reduced, and the problems of single repeated operation and complexity in the contact angle measurement process are avoided.
Drawings
FIG. 1 is a schematic view of the overall structure of the atomization process of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the contact angle measurement of the present invention;
FIG. 3 is a schematic view of the internal structure of the liquid pumping device;
FIG. 4 is a schematic structural view of a three-way valve in a state where a measuring liquid suction pipe is communicated with a spray pipeline;
FIG. 5 shows the three-way valve in the distillation straw and spray a schematic structural diagram in a state that the pipelines are communicated;
FIG. 6 is a schematic view showing the structure of a three-way valve in a state where a measuring liquid suction pipe is communicated with a distillation suction pipe;
graphic notation: 1. a handle; 2. a tray; 3. coal sample; 4. a spraying device; 5. an atomizing nozzle; 6. a rotating device; 7. 1# pump liquid device; 8. a three-way valve; 9. 2# liquid pumping device; 10. a support frame; 11. distilled water; 12. measuring the liquid; 13. a solution to be tested; 14. a measuring liquid suction pipe; 15. a distillation straw; 16. a three-way valve interface; 17. a spray line; 18. a three-way valve rotary switch; 19. a liquid inlet check valve; 20. a liquid outlet one-way valve; 21. a spring; 22. a liquid pumping device surface housing; 23. a nozzle outlet; 24. a push rod with a piston; 25. a burette; 26. a titration needle head; 27. a computer; 28. a contact angle measuring instrument; 29. high-speed cameras.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device, component, or structure referred to must have a particular orientation, be constructed or operated in a particular orientation, and should not be construed as limiting the present invention.
The following will further explain the specific implementation method of the present invention with reference to the attached drawings.
As shown in fig. 1-6, the device comprises a tray 2, a coal sample 3, a spraying device 4, a burette 25, a support frame 10, distilled water 11, a surfactant solution 12 and a contact angle measuring instrument 28, wherein a rotating device 6 is fixedly arranged above the support frame 10, a 1# pump liquid device 7 and a three-way valve 8 are connected through a spraying pipeline 17 and are sequentially arranged on the support frame, a distillation suction pipe 15 and a measuring liquid suction pipe 14 are communicated with the spraying pipeline 17 through the three-way valve 8, and a 2# pump liquid device 9 is arranged below the three-way valve 8 and is connected with each other through the distillation suction pipe 15.
The spraying device 4 is formed by combining a support frame 10, a spraying pipeline 17 and an atomizing nozzle 5, the spraying pipeline 17 is installed inside the support frame 10, and the atomizing nozzle 5 is connected at the outlet of the spraying pipeline 17.
Preferably, the spraying device 4 sprays the measured surfactant solution 12 on the surface of the coal sample to be measured uniformly and slightly through the atomizing nozzle 5, so that the problem that the titration solution is measured on the surface of the coal sample subjected to expansion deformation due to the fact that the surface of the briquette absorbs excessive water, and further the experimental measurement result is influenced is avoided.
Preferably, the atomized briquette is placed in a drying oven for drying and cooling, and the water in the hydrophobic surfactant solution is removed through evaporation, so that the interference of the water in the surfactant solution 12 on the experimental result is avoided, and the cleaning work of the titration device after titration by the surfactant solution 12 is reduced; meanwhile, surfactant molecules are retained on the surface of the coal sample to form a hydrophobic protective film, and the contact angle formed by the titration liquid on the surface of the coal sample is long in existence time and stable, so that the contact angle can be measured easily.
Preferably, when the coal sample 3 is atomized, the amount of the surfactant solution 12 is small, and the surfactant solution is not in direct contact with the coal sample, so that the pollution of the coal sample to the surfactant solution 12 in a soaking method is reduced, and the coal sample can be used for multiple times; the method only sprays the water solution on the surface of the coal sample to be titrated, so that the drying time is short, and the contact angle measurement efficiency is improved.
The titration apparatus is composed of a titration needle 26, a burette 25, a titration solution and a push rod 24 with a piston, wherein the burette is fixed on the support frame 10 through a clamper; the rotating device 6 connects the spraying device 4 on the left side of the support frame 10 with the titration device on the right side, so that the rotation of the two groups of devices can be realized; the liquid pumping device comprises a 1# liquid pumping device 7 and a 2# liquid pumping device 9,1# liquid pumping device 7 which are positioned below the rotating device 6, a 2# liquid pumping device 9 which is positioned below the three-way valve 8, surface shells 22 of the liquid pumping devices have high elasticity and compressibility, and the liquid pumping devices are internally composed of a liquid inlet one-way valve 19, a liquid outlet one-way valve 20 and a spring 21.
Preferably, the liquid outlet one-way valve 20 is arranged above the inside of the liquid pumping device, and the liquid inlet one-way valve 19 is arranged below the inside of the device; the spring 21 is arranged in the middle of the interior of the device, and plays an auxiliary role in the recovery stage after the liquid pumping device extrudes, so that the liquid pumping device can quickly recover to the initial state before extrusion, and the liquid pumping efficiency is improved. The surface shell 22 of the liquid pumping device has stronger elasticity and compressibility, when the liquid pumping device extrudes the liquid pumping device, the internal space of the device is reduced, the pressure is increased, and the liquid flows out of the liquid outlet one-way valve 20 and then flows into the spraying pipeline 17 or the three-way valve 8 above the liquid outlet one-way valve; in the recovery stage after extrusion, the liquid pumping device is quickly restored to the initial state before extrusion under the assistance of the atmospheric pressure and the spring 21, at this time, the internal space of the device is increased, the pressure is reduced, the liquid flows in through the liquid inlet one-way valve 19, and the distilled water 11 or the surfactant solution 12 below is sucked into the liquid pumping device.
As shown in fig. 4, the three-way valve 8 is positioned above the # 2 pump liquid device 9 and attached to the support frame 10, and its ports are connected to the spray line 17, the distillation suction pipe 15, and the measurement liquid suction pipe 14 in this order, and communicate the # 1 pump liquid device 7, the distilled water 11, and the measurement liquid 12, respectively. Wherein, the measuring liquid is a surfactant solution 12,2# pump liquid device under the condition of certain concentration, can be used as a limiting device and a power device which only allow the distilled water 11 to flow out in one direction, and is mainly used for cleaning the measuring liquid suction pipe 14; the distilled water 11 is used for cleaning devices such as the No. 1 pump liquid device 7, the spraying pipeline 16, the spraying device 4, the measuring liquid suction pipe 13 and the like, so that the disassembly and assembly of the cleaning work are reduced, and the working efficiency is improved.
The contact angle measuring instrument 28 is composed of a high-speed camera 29 and a computer 27 equipped with contact angle measuring software. The high-speed camera 29 shoots the titration process of the titration liquid on the surface of the coal sample and the change condition of the contact angle, and the contact angle measurement software arranged on the computer 27 is used for measurement and calculation to obtain a more accurate contact angle.
The technical scheme of the invention also provides a method for measuring the spray type coal rock contact angle, which comprises the following steps:
s001, rotating a rotary switch 18 on the three-way valve 8 to communicate the measuring liquid suction pipe 14 with the spraying pipeline 17;
s002, placing the coal sample 3 below the spraying device 4, and enabling the atomizing nozzle 5 to be opposite to the surface of the coal sample;
s003, extruding and releasing the No. 1 pump liquid device 7 for multiple times, wherein the measured surfactant solution 12 enters the No. 1 pump liquid device 7 through the liquid inlet one-way valve 19, and is sprayed out from the atomizing nozzle 5 through the atomizing pipeline 17, and the atomized surfactant solution 12 is uniformly sprayed on the surface of the coal sample;
s004, placing the atomized coal sample 3 in a drying box for drying, taking out and cooling;
s005, opening the contact angle measuring instrument 28, and placing the coal sample at a proper position where the high-speed camera 29 can shoot;
s006 adjusts the rotating device 6 and the clamp holder, adjusts the titration apparatus to be right above the coal sample 3, and ensures that the liquid outlet of the titration needle 25 and the surface of the coal sample 3 are in the shooting range of the high-speed camera 29;
s007 slowly pushes a push rod 24 with a piston, and a titration liquid in a burette 25 forms a liquid drop which is continuously enlarged at a titration needle 26 until the liquid drop falls on the surface of the coal sample and forms a certain angle on the surface of the coal sample;
s008, shooting the titrated liquid drop in the whole process of contacting the surface of the coal body by using a contact angle measuring instrument 28 to form hundreds of shot images, selecting a clear and stable image from the shot images, and measuring and calculating a contact angle by using software, wherein the contact angle of the surfactant solution 12 with the concentration on the surface of the coal sample is determined to be finished;
s009 rotating a rotary switch 18 on the three-way valve to communicate the distillation suction pipe 15 with the spray pipeline 17;
s010 extrudes and releases the 1# pump liquid device 7 for multiple times again, and cleans and removes the measuring liquid 12 retained in the spraying device 4 and the 1# pump liquid device 7, so as to avoid influencing the next group of experimental results;
s011, rotating a rotary switch 18 on a three-way valve again, communicating a distillation suction pipe 15 with a measuring liquid suction pipe 14, extruding and releasing a 2# pump liquid device 9 for multiple times, and flushing the surfactant solution 12 retained in the measuring liquid suction pipe 14;
s012 removing the measured liquid 12 after the measurement is finished, inserting a measured liquid suction pipe 14 into the liquid 13 to be measured, and converting the liquid 13 to be measured into the measured liquid 12;
s013 repeating the steps, and measuring the contact angle of the surface of the next group of coal samples;
s014, the contact angles of the surfaces of the coal samples treated by the surfactant solutions with different concentrations and types are measured and recorded, and the data of the measured contact angles are arranged, analyzed and summarized.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations and modifications can be made, which are consistent with the principles of the invention, from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (4)
1. A spray type coal rock contact angle measuring method is characterized by comprising the following steps:
s001, rotating a rotary switch on a three-way valve to communicate a measuring liquid suction pipe with a spray pipeline;
s002, placing the coal sample below the spraying device, and enabling the atomizing nozzle to be opposite to the surface of the coal sample;
s003, extruding and releasing the No. 1 pump liquid device for multiple times, wherein the measured surfactant solution enters the No. 1 pump liquid device through a liquid inlet one-way valve and is sprayed out from an atomizing nozzle through a spraying pipeline, and the atomized surfactant solution is uniformly sprayed on the surface of the coal sample;
s004, placing the atomized coal sample in a drying box for drying, taking out and cooling;
s005, opening the contact angle measuring instrument, and placing the coal sample at a proper position where the high-speed camera can shoot;
s006 adjusts the rotating device and the clamp holder, adjusts the titration apparatus right above the coal sample, ensures the liquid outlet of the titration needle and the surface of the coal sample in the range shot by the high-speed camera;
s007 slowly pushes a push rod with a piston, and a titration solution in a titration tube forms a liquid drop which is continuously enlarged at a titration needle head until the titration solution drops on the surface of a coal sample and forms a certain angle on the surface of the coal sample;
s008, shooting the titration solution on the whole process of contact of the surface of the coal sample by using a contact angle measuring instrument to form hundreds of shot images, selecting clear and stable images from the shot images, and measuring and calculating a contact angle by using software, wherein the contact angle of the surfactant solution with the concentration on the surface of the coal sample is determined to be finished;
s009 a rotary switch on the three-way valve is rotated to communicate the distilled water suction pipe with the spray pipeline;
s010 carries out extrusion and release on the No. 1 pump liquid device for multiple times again, and the measurement liquid retained in the spraying device and the No. 1 pump liquid device is cleaned and removed, so that the influence on the next group of experiment results is avoided;
s011, rotating a rotary switch on a three-way valve to communicate a distillation suction pipe with a measuring liquid suction pipe, extruding and releasing a 2# pump liquid device for multiple times, and flushing surfactant solution retained in the measuring liquid suction pipe;
s012 removing the measured liquid after the measurement, inserting a measured liquid suction pipe into the liquid to be measured, and converting the liquid to be measured into the measured liquid;
s013 repeating the steps, and measuring the contact angle of the surface of the next group of coal samples;
s014, measuring and recording the contact angles of the surfaces of the coal samples treated by the surfactant solutions with different concentrations and types, and sorting, analyzing and summarizing the data of the measured contact angles;
the spray type coal rock contact angle measuring device comprises a spraying device, a titration device, a support frame, a rotating device, a liquid pumping device and a contact angle measuring instrument, wherein the rotating device is fixedly arranged above the support frame, the 1# liquid pumping device is positioned between the rotating device and a three-way valve, a distillation suction pipe and a liquid measuring suction pipe are communicated with a spraying pipeline through the three-way valve, and the 2# liquid pumping device is arranged below the three-way valve and connected with each other through the distillation suction pipe;
the spraying device is formed by combining a spraying pipeline and an atomizing nozzle, the spraying pipeline is arranged in the support frame, the atomizing nozzle is connected at the outlet of the spraying pipeline, and the surfactant solution is atomized at the atomizing nozzle and uniformly sprayed and attached to the surface of the coal sample;
the titration apparatus is formed by combining a titration needle head, a titration tube, titration liquid and a push rod with a piston, the titration tube is fixed on the support frame through a clamp holder, and the rotation device can adjust the positions of the titration apparatus and the spraying apparatus, so that the operation is simple and the work is efficient.
2. The spray-type coal rock contact angle measurement method according to claim 1, characterized in that: the liquid pumping device comprises a 1# liquid pumping device and a 2# liquid pumping device, wherein the 1# liquid pumping device is positioned below the rotating device, the 2# liquid pumping device is positioned below the three-way valve, surface shells of the 2# liquid pumping device are elastic and compressible, and the liquid pumping device is internally composed of a liquid inlet one-way valve, a liquid outlet one-way valve and a spring; the liquid inlet one-way valve is positioned below the interior of the liquid pumping device, the liquid outlet one-way valve is positioned above the interior of the liquid pumping device, and when the surface shell of the liquid pumping device is extruded, liquid in the device flows out through the liquid outlet one-way valve and enters the spraying pipeline/three-way valve; in the spring-assisted recovery stage, liquid enters the liquid pumping device through the liquid inlet one-way valve.
3. The spray-type coal rock contact angle measurement method according to claim 1, characterized in that: the three-way valve is positioned above the No. 2 liquid pumping device and is arranged on the support frame, and the interface of the three-way valve is connected with the spraying pipeline, the distillation suction pipe and the liquid measuring suction pipe to respectively communicate the No. 1 liquid pumping device, the distilled water and the liquid measuring suction pipe; wherein the determination solution is a surfactant solution under a certain concentration condition; the 2# pump liquid device can be used as a limiting device and a power device which only allow distilled water to flow out in a single direction, and the distilled water is used for cleaning the 1# pump liquid device, the spraying device and the measuring liquid suction pipe, so that the disassembly and assembly of the cleaning work are reduced, and the working efficiency is improved.
4. The spray-type coal rock contact angle measurement method according to claim 1, characterized in that: the pump liquid device cleans and removes the retained surfactant solution, reduces the workload of disassembling and flushing the pipeline system, reduces the error caused by the residual surfactant solution in the pipeline to the experimental result, and improves the accuracy and the reliability of the experiment.
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| JPH0850088A (en) * | 1994-08-09 | 1996-02-20 | Toyota Motor Corp | Contact angle measuring method |
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