CN105823667B - A kind of cherry coal rock sample-preparing system and method - Google Patents
A kind of cherry coal rock sample-preparing system and method Download PDFInfo
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- CN105823667B CN105823667B CN201610336331.1A CN201610336331A CN105823667B CN 105823667 B CN105823667 B CN 105823667B CN 201610336331 A CN201610336331 A CN 201610336331A CN 105823667 B CN105823667 B CN 105823667B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The present invention relates to a kind of cherry coal rock sample-preparing system and methods, it includes chest and safety relief valve equipped with case lid, hole is offered on the case lid and liquid nitrogen processing system and pumped vacuum systems are separately connected by pipeline, and the liquid nitrogen processing system includes passing through inlet pipe liquid feed valve connected in sequence, first pressure gauge, liquid nitrogen container shut-off valve and liquid nitrogen container；The safety relief valve passes through case lid and stretches into chest, and the junction of safety relief valve and case lid is arranged with sealing shroud.The system carries out vacuum outgas using pumped vacuum systems, so that the microdefects spaces such as cherry coal lithofraction gap is filled by water, and reach water suction saturation state；Super low temperature is carried out to cherry coal rock using liquid nitrogen processing system, freezes cherry coal rock, solves the cherry coal rock difficulty easily broken when preparing test specimen.The system structure is simple, easy to use, realizes and fast and efficiently prepares soft coal petrography test sample, and advantageous experiment determination condition is provided for the physico mechanical characteristic parameter etc. of cherry coal rock.
Description
Technical field
The invention belongs to coal petrography attribute testing technical fields, and in particular to a kind of cherry coal rock sample-preparing system and method, mainly
Making for coal petrography test specimen used in laboratory experiment.
Background technology
It is well known that in the design of the engineerings such as coal mining, coal bed gas drainage, coal bed gas gas injecting mining, coal petrography
Physico mechanical characteristic parameter（Such as：The tension compressive strength of coal petrography, absorption constant, permeability etc.）It is critically important index, these ginsengs
Number must be obtained by experiment.However, China's major part mine coal seam belongs to weak seam, coal quality is soft, intensity is relatively low and easy
Work of producing to cherry coal coal sample in broken the features such as increases difficulty.Therefore, the preparation method of cherry coal coal sample is research work
Person's urgent problem to be solved.
At present there are two types of the test specimen preparation methods of cherry coal rock：One is moulded coal coal sample preparation method, this method be by
Cherry coal crushes, and a certain amount of additive is mixed into coal dust, if the substance for being analogous to oil or resin etc of addition, this
A little substances can not be removed after making moulded coal coal sample, can lead to the change of coal sample physico-mechanical properties.Another kind is raw coal
Production method is directly sampled using drill hole sampling machine on the complete coal cinder of bulk, since there are some initially to split in original coal cinder
Gap/crackle and intensity is low, it is easily broken, coal sample drill through complete before begin to be broken, success rate is low, is extremely difficult to manage
The sampling effect thought.Therefore, a kind of new cherry coal rock sample-preparing system of urgent need and method realization fast and efficiently prepare cherry coal rock
Test specimen.
Invention content
Present invention aims to overcome that prior art defect, a kind of effective cherry coal rock sample-preparing system and method are provided,
Simple and easy to do, success rate is high, provides advantageous experiment determination condition for the physico mechanical characteristic parameter etc. of cherry coal rock, is prepared into
Soft coal petrography test sample compared with Method for making briquette, can more embody the true physico mechanical characteristic of cherry coal.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of cherry coal rock sample-preparing system comprising be equipped with the chest of case lid, offer hole on the case lid and pass through pipeline
Be separately connected liquid nitrogen processing system and pumped vacuum systems, the liquid nitrogen processing system include by inlet pipe it is connected in sequence into
Liquid valve, first pressure gauge, liquid nitrogen container shut-off valve and liquid nitrogen container；It is additionally provided with safety relief valve on the case lid.
Specifically, the pumped vacuum systems includes by outlet pipe the first valve connected in sequence, second pressure gauge, delays
Rush tank, the second valve, vacuum meter and vacuum pump.
Preferably, the chest is wooden case；The inlet pipe and outlet pipe pass through case lid and stretch into chest, and into
The junction of liquid pipeline and outlet pipe and case lid is arranged with sealing shroud.
The method for carrying out cherry coal rock sample preparation using above system, specifically comprises the following steps：
1）Case lid is opened, is positioned over the original coal cinder come is fetched from scene in chest, is then added water to and flood into chest
Do not have original coal cinder；
2）Case lid, installation connection liquid nitrogen processing system and pumped vacuum systems are covered, and ensures that junction seals；
3）Close liquid nitrogen container shut-off valve and safety relief valve, start pumped vacuum systems, to entire cherry coal rock sample-preparing system into
Row degassing process closes pumped vacuum systems after cherry coal rock sample-preparing system vacuum degree reaches requirement；
4）Liquid feed valve and safety relief valve are opened, liquid nitrogen container shut-off valve is adjusted according to first pressure gauge registration, passes through feed liquor
Pipeline injects liquid nitrogen into chest so that original coal cinder and water freeze, and closing liquid nitrogen container shut-off valve and liquid feed valve, liquid nitrogen are handled
After 20-40min, closed safe relief valve；
5）It dismantles liquid nitrogen processing system and pumped vacuum systems, opens case lid, it will be equipped with the original coal cinder and ice after freezing
Chest, which is placed on the coring platform of drill hole sampling machine, carries out coring；
6）The column coal sample for drilling through out is polished into the coal sample of size needed for experiment on Double End stone mill, and will system
The coal sample performed is placed in drying in drying box, in case needed for experiment.
In the present invention, the anabolic reactions system such as chest, case lid, sealing shroud, safety relief valve is utilized.Original coal cinder is placed
In chest, water is injected into chest to original coal cinder is flooded, case lid is placed on wooden case and is screwed（Case lid and chest can be spiral shells
Line connects）Constitute closed system；Case lid is equipped with aperture, is separately connected pumped vacuum systems and liquid nitrogen processing system.
In the present invention, pumped vacuum systems is formed using vacuum pump, vacuum meter, surge tank and associated pipe etc..Close liquid nitrogen
Tank shut-off valve and safety relief valve are de-gassed to entirely testing pipeline using vacuum pump, keep original coal cinder crack etc. micro-
It is filled by water and is finally reached water suction saturation state in defect space；Prevent water from entering vacuum when the effect of surge tank is to vacuumize
In pump, vacuum pump is caused to damage, plays the role of protecting vacuum pump, it is ensured that sample making course carries out safely.
In the present invention, liquid nitrogen container, liquid nitrogen container shut-off valve, low temperature resistant first pressure gauge, liquid feed valve and associated pipe are utilized
Deng composition liquid nitrogen processing system.Since 1 cubic metre of liquid nitrogen can be expanded to 696 cubic metres of pure gaseous nitrogen, to avoid liquid nitrogen
Vaporization causes volume drastically to expand in injection chest, opens safety relief valve；Liquid nitrogen shut-off valve is opened, liquid nitrogen goes out from liquid nitrogen container
After coming, indicates that number adjusts liquid feed valve and controls liquid nitrogen flow size according to low-temperature pressure, case is injected by low temperature resistant inlet pipe
In son, makes to reach in chest and inhale the ultralow temperature that water saturated original coal cinder and water are handled in liquid nitrogen（- 180 DEG C or so）Under the conditions of it is fast
Quick-frozen knot.
Compared to the prior art, beneficial effects of the present invention：
1）The present invention provides a kind of cherry coal rock sample-preparing systems, and the system structure is simple, easy to operate.The system and drilling
Sampling organically combines, by cherry coal rock vacuum outgas, reaching water suction saturation, then liquid nitrogen being utilized to handle, freeze cherry coal, finally
The cylindrical cherry coal coal sample of test requirements document is obtained by drill hole sampling machine coring；
2）The present invention provides a kind of easy-to-use cherry coal rock method for making sample, coal sample can be kept preferable using this method
Integrality, that improves raw coal sample produces efficiency；
3）The present invention is that the physico mechanical characteristic parameter etc. of cherry coal rock provides advantageous experiment determination condition；By this hair
The bright soft coal petrography test sample being prepared into can more embody the true physico mechanical characteristic of cherry coal rock compared with Method for making briquette.
Description of the drawings
Fig. 1 is the structural schematic diagram of cherry coal rock sample-preparing system of the present invention；
1：Liquid nitrogen container；2：Liquid nitrogen container shut-off valve；3：First pressure gauge；4：Liquid feed valve；5：Low temperature resistant inlet pipe；6：Wood
Case；7：Original coal cinder；8：Water；9：Case lid；10：Sealing shroud；11：Outlet pipe；12：Safety relief valve；13 first valves；14：
Second valve；15：Second pressure gauge；16：Surge tank；17：Vacuum meter；18：Vacuum pump；
Fig. 2 is drill hole sampling machine coring schematic diagram；19：Ice；20：Drill hole sampling machine coring drill rod；21：Drill hole sampling machine；
Fig. 3 is the stress-of the cherry coal rock coal sample produced using system and method described in embodiment 1 under the conditions of confining pressure 3MPa
Strain curve；
Fig. 4 is that the stress-strain of the moulded coal coal sample produced using existing moulded coal preparation method under the conditions of confining pressure 3MPa is closed
It is curve.
Specific implementation mode
Technical scheme of the present invention is further discussed in detail with reference to embodiments, but protection scope of the present invention
It is not limited thereto.
Embodiment 1
As shown in Figure 1, a kind of cherry coal rock sample-preparing system comprising be equipped with the wooden case 6 of case lid 9, offered on the case lid 9
Hole is simultaneously separately connected liquid nitrogen processing system and pumped vacuum systems by pipeline, and the liquid nitrogen processing system includes passing through inlet pipe
5 liquid feed valve 4, first pressure gauge 3, liquid nitrogen container shut-off valve 2 and liquid nitrogen containers 1 connected in sequence；Safety is additionally provided on the case lid 9 to let out
Pressure valve 12.The pumped vacuum systems includes by 11 first valve 13 connected in sequence of outlet pipe, second pressure gauge 15, buffering
Tank 16, the second valve 14, vacuum meter 17 and vacuum pump 18.The inlet pipe 5 and outlet pipe 11 pass through case lid 9 and stretch into wood
In case 6, and inlet pipe 5 and outlet pipe 11 and the junction of case lid 9 are arranged with sealing shroud 10.
In the present invention, first pressure gauge 3（To monitor the pressure of liquid nitrogen）, inlet pipe 5 and sealing shroud 10 be because being used for
Liquid nitrogen is conveyed, so needing to have low temperature resistant function, these are the common components of liquid nitrogen transportation art, can directly be bought general
Logical commercial product.
As illustrated in fig. 1 and 2, the method for carrying out cherry coal rock sample preparation using above system, specifically comprises the following steps：
1）Case lid 9 is opened, is positioned over the original coal cinder 7 come is fetched from scene in the appropriate wooden case of size 6, then to wooden case
In 6 plus water 8 are to flooding original coal cinder 7；
2）It covers and screws case lid 9 so that case lid 9 constitutes confined space with wooden case 6.Installation connection liquid nitrogen processing system and
Pumped vacuum systems, and ensure that junction seals；
3）Liquid nitrogen container shut-off valve 2 and safety relief valve 12 are closed, the first valve 13 and the second valve 14 are opened, starts vacuum
18 pairs of entire cherry coal rock sample-preparing systems of pump are de-gassed, make the microdefects space such as crack of original coal cinder 7 filled by water 8 and
It is finally reached water suction saturation, the vacuum level requirements for reaching experiment are judged whether according to the reading of vacuum meter 17.Wait for vacuum meter 17
When reading is 40Pa ± 0.5Pa, that is, it is considered as the vacuum level requirements for reaching experiment.It is then turned off vacuum pump 18, simultaneously closes off first
Valve 13 and the second valve 14；
4）Liquid feed valve 4 and safety relief valve 12 are opened, liquid nitrogen container shut-off valve 2 is adjusted according to the registration of first pressure gauge 3, is led to
It crosses inlet pipe 5 and injects liquid nitrogen into wooden case 6 so that original coal cinder 7 and water 8 are in ultralow temperature（- 180 DEG C or so）Under the conditions of quickly
Freeze, closes liquid nitrogen container shut-off valve 2 and liquid feed valve 4, after liquid nitrogen handles about 30min, closed safe relief valve 12；
5）It dismantles liquid nitrogen processing system and pumped vacuum systems, opens case lid 9, it will be equipped with the original coal cinder 7 and ice after freezing
19 wooden case 6 is placed on the coring platform of drill hole sampling machine 21, and coring is carried out using drill hole sampling machine coring drill rod 20；
6）The column coal sample for drilling through out is polished into the coal sample of size needed for experiment on Double End stone mill, and will system
The coal sample performed is placed in drying box, in case experiment is used.
Fig. 3 is the stress-of the cherry coal rock coal sample produced using system and method described in embodiment 1 under the conditions of confining pressure 3MPa
Strain curve；Fig. 4 is that the stress-of the moulded coal coal sample produced using existing moulded coal preparation method under the conditions of confining pressure 3MPa is answered
Become relation curve.Comparison diagram 3 and Fig. 4 can be seen that：The cherry coal rock coal sample produced using system and method described in embodiment 1 can
More accurately react the load-deformation curve of raw coal；Due to when producing coal sample using moulded coal coal sample preparation method, being mixed with and adding
The intensity that agent makes coal sample is added to change so that the load-deformation curve tested deviates larger with raw coal experimental result.
In summary：Present system carries out vacuum outgas using pumped vacuum systems, keeps the microdefects such as cherry coal lithofraction gap empty
Between filled by water, and reach water suction saturation state；Super low temperature is carried out to cherry coal rock using liquid nitrogen processing system, freezes cherry coal
Rock solves the cherry coal rock difficulty easily broken when preparing test specimen.Present system is simple in structure, easy to use, real
Show and fast and efficiently prepared soft coal petrography test sample, advantageous examination is provided for the physico mechanical characteristic parameter etc. of cherry coal rock
Test fixed condition.
Claims (3)
1. a kind of method carrying out cherry coal rock sample preparation using cherry coal rock sample-preparing system, which is characterized in that include the following steps：
1）Case lid is opened, is positioned over the original coal cinder come is fetched from scene in chest, is then added water into chest and flood original
Beginning coal cinder；
2）Case lid is covered, liquid nitrogen processing system and pumped vacuum systems are connected, and ensures that junction seals；
3）Liquid nitrogen container shut-off valve and safety relief valve are closed, starts pumped vacuum systems, entire cherry coal rock sample-preparing system is taken off
Gas disposal closes pumped vacuum systems after cherry coal rock sample-preparing system vacuum degree reaches requirement；
4）Liquid feed valve and safety relief valve are opened, liquid nitrogen container shut-off valve is adjusted according to first pressure gauge registration, passes through inlet pipe
Liquid nitrogen is injected into chest so that original coal cinder and water freeze, and closing liquid nitrogen container shut-off valve and liquid feed valve wait for that liquid nitrogen handles 20-
After 40min, closed safe relief valve；
5）It dismantles liquid nitrogen processing system and pumped vacuum systems, case lid is opened, by the chest equipped with original coal cinder and ice after freezing
It is placed on the coring platform of drill hole sampling machine and carries out coring；
6）The column coal sample for drilling through out is polished into the coal sample of size needed for experiment on Double End stone mill, and will be made
Coal sample be placed in drying box it is dry, in case needed for experiment；
The cherry coal rock sample-preparing system includes the chest equipped with case lid, offers hole on the case lid and is separately connected by pipeline
Liquid nitrogen processing system and pumped vacuum systems, the liquid nitrogen processing system include by inlet pipe liquid feed valve connected in sequence, the
One pressure gauge, liquid nitrogen container shut-off valve and liquid nitrogen container；It is additionally provided with safety relief valve on the case lid.
2. the method for cherry coal rock sample preparation as described in claim 1, which is characterized in that the pumped vacuum systems includes passing through escape pipe
Road the first valve connected in sequence, second pressure gauge, surge tank, the second valve, vacuum meter and vacuum pump.
3. the method for cherry coal rock sample preparation as described in claim 1, which is characterized in that the chest is wooden case；The inlet pipe
Case lid is passed through with outlet pipe and is stretched into chest, and the junction of inlet pipe and outlet pipe and case lid is arranged with sealing
Set.
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| CN201610336331.1A CN105823667B (en) | 2016-05-20 | 2016-05-20 | A kind of cherry coal rock sample-preparing system and method |
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| CN106840911B (en) * | 2017-01-05 | 2019-12-24 | 中国石油大学(华东) | Liquid nitrogen temperature and pressure control freeze-thaw damage shale experimental device and method |
| CN110608922A (en) * | 2019-09-10 | 2019-12-24 | 北京建筑大学 | Liquid sample vacuum collecting device and control method |
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| CN103245539A (en) * | 2013-04-22 | 2013-08-14 | 河南理工大学 | Manufacturing method of coal samples with different water contents |
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| CN205642964U (en) * | 2016-05-20 | 2016-10-12 | 河南理工大学 | Soft coal rock system appearance system |
| CN205691360U (en) * | 2016-06-16 | 2016-11-16 | 重庆大学 | Coal seam gas-bearing capacity measures advanced freezing sampler |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294876A (en) * | 2008-06-03 | 2008-10-29 | 中国科学院武汉岩土力学研究所 | Production method and device of soft coal petrography test sample |
| CN101514614A (en) * | 2009-04-02 | 2009-08-26 | 吉林大学 | Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method |
| CN102830213A (en) * | 2012-08-10 | 2012-12-19 | 河南理工大学 | Adsorption-desorption-seepage experiment system for loaded coal containing gas under condition of varying temperatures |
| CN102928272A (en) * | 2012-10-24 | 2013-02-13 | 河南理工大学 | Briquette coal sample making tool and method |
| CN103245539A (en) * | 2013-04-22 | 2013-08-14 | 河南理工大学 | Manufacturing method of coal samples with different water contents |
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