CN103207130A - Method for testing deformation feature parameters of coal test sample in thermal expansion process - Google Patents
Method for testing deformation feature parameters of coal test sample in thermal expansion process Download PDFInfo
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Abstract
The invention discloses a method for testing deformation feature parameters of a coal test sample in a thermal expansion process. The method comprises the following steps of: sticking measurement strain gauges along the axial direction and the radial direction of the surface of the coal test sample, arranging temperature compensation sheets of the same specification at adjacent positions, and respectively connecting the two measurement strain gauges and the compensation sheets to form two Wheatstone bridge circuits; putting the coal test sample into a desorption tank, putting the desorption tank into a water bath tank, heating a water bath gradually step by step, monitoring the flow of gas discharged from the desorption tank, concentrations of component of the gas and volume strain data of the coal test sample in real time, and obtaining volume deformation amounts of the coal test sample in a heat absorption stage and a heat balance stage and the desorption amount of the desorbed gas; and analyzing and calculating a thermal expansion coefficient and a desorption contraction coefficient of the coal test sample according to the volume deformation amounts of the coal test sample and the amount of the desorbed gas under different constant-temperature conditions, so that deformation features of coal in a hot environment can be quantified and evaluated; and an important test basis is supplied to research on the stability of a coal layer in a high temperature heat damage mine.
Description
Technical field
The invention belongs to the physical detection methods of coal, be specifically related to a kind of method of estimating coal deformation behaviour parameter under hot environment.
Background technology
In the seam mining environment of deep, high ground temperature has become influences the very important principal element of regularity of coal seam.It is generally acknowledged that rock medium generally has the characteristic of expanding with heat and contract with cold, but because the double porosity structure that exists in the coal body thereby have stronger characterization of adsorption.The temperature that raises can also discharge a large amount of desorption gas from the coal pore texture except causing the coal body thermal expansion.After the adsorbed gas desorb breaks away from the coal surface, because the increase of coal surface energy can make matrix of coal occur to inner tendencies toward shrinkage.The deformation process of this first expansion post shrinkage under hot environment can produce complicated irreversible fire damage to the coal body structure, can significantly change the mechanical strength of coal body.Therefore, by obtaining coal body deformation behaviour parameter under thermal environment coal body distortion evolution rule in the further investigation hot environment further is familiar with deep heat evil mine and is caused calamity mechanism and can play a key effect.
Summary of the invention
The object of the invention is to provide the method for testing of deformation behaviour parameter in a kind of coal sample thermal expansion process.
For achieving the above object, the technical scheme that the present invention takes is:
The method of testing of deformation behaviour parameter in a kind of coal sample thermal expansion process may further comprise the steps:
The first step, the coal sample is processed into right cylinder, at cylindric coal sample periphery axially and paste radial measurement foil gauge and axial measurement foil gauge in the radial position respectively, the foil gauge of same size is set as the temperature compensation foil gauge of axial and radial measurement foil gauge respectively two adjacent locations of measuring foil gauge, the temperature compensation foil gauge is not fixed on the coal sample surface; Axially measure foil gauge and radial measurement foil gauge and connect to form this electric bridge half-bridge structure of two Huitong with separately temperature compensation foil gauge according to the half-bridge mode respectively;
In second step, the above-mentioned coal sample that has this electric bridge half-bridge structure of Huitong is placed on the solution cucurbitula base; The lead of two these electric bridge half-bridge structures of Huitong is connected to external strain acquirement instrument by the data-interface on the desorb tank body;
The 3rd step, an air-path interface separating cucurbitula is connected the protection source of the gas that has air valve, another road air-path interface connects gas meter and gas chromatograph successively; To separate that cucurbitula is built-in goes into temperature sensor, temperature sensor and external temperature Acquisition Instrument are connected; After assembling finishes, detect the impermeability of separating cucurbitula;
In the 4th step, will separate cucurbitula and insert water bath; Open the air valve of protection source of the gas, source of the gas injects helium to separating in the cucurbitula, fill with helium after, in jar unnecessary gas can the gas coming through flowmeter and gas chromatograph be discharged into external environment; When gas meter monitoring gas flow steadily, gas chromatograph detect gas concentration value near 100% after, illustrate that separating in cucurbitula and the coal sample air pocket is discharged the pass gas check valve fully;
The 5th step: water temperature in the water bath is risen to design temperature, the temperature T in the temperature acquisition instrument real time record solution cucurbitula; The axial strain ε a of strain acquirement instrument real time record coal sample and the strain data of radial strain ε r both direction obtain the bulk strain amount ε v of coal sample under the different temperatures; The stripping gas scale of construction V that discharges in the gas meter real time record solution cucurbitula; Gas chromatograph detects separates composition and the concentration of discharging gas in the cucurbitula;
The 6th step: make and separate temperature rising Δ T in the cucurbitula by setting different bath temperatures, obtain under corresponding temperature condition coal sample from original state to the thermal equilibrium process bulk strain amount ε v and the stripping gas scale of construction V of coal sample.Utilize mathematical physics relation between the two, can be in the hope of the coal sample thermal expansivity γ under the corresponding temperature condition and desorb contraction coefficient K, and the test result under all temperature conditions carried out statistical study, thereby obtain comparatively accurate coal thermal expansivity and desorption gas contraction coefficient thereof.Concrete grammar is as follows:
The 6.1st step: calculate coal volume of sample dependent variable ε v
Bulk strain amount ε v for the coal of elastic deformation can be expressed as formula (1):
εv=εa+2·εr (1)
In the formula (1): ε a representative axially should be measured, and ε r represents the radial strain amount;
The bulk strain amount ε v that measures foil gauge monitoring coal is the thermal expansion dependent variable ε of coal
TOffset gas desorption and cause matrix of coal contraction strain amount ε
dAfter effective strain amount ε
e, i.e. formula (2)
εv=εe=εa+2ε
r=ε
T-εd (2)
The 6.2nd step: calculate matrix of coal contraction strain amount ε
d
Stripping gas scale of construction V and matrix of coal contraction strain amount ε from coal
dBecome positive correlation:
εd∝V
The coal discharge stripping gas scale of construction V that observes under isoperibol is that the function of heat balance time t is V=V (t); So matrix of coal contraction strain amount ε
dCan be expressed as ε d=KV (t) with stripping gas scale of construction V relation, wherein K is the matrix of coal contraction coefficient.
The 6.3rd step: calculate total stripping gas scale of construction V
The desorption gas component and the corresponding concentration C i thereof that utilize the gas chromatograph analysis to discharge, wherein i is the adsorbed gas classification;
Concentration according to discharging gas flow V and gas with various calculates all kinds of stripping gas scale of construction Vi=VCi, and desorption gas cumulative volume amount is V=∑ VCi so.
The 6.4th step: obtain coal volume of sample dependent variable ε v and stripping gas scale of construction V relation
The thermal expansivity γ of coal is constant, the thermal expansion dependent variable ε of coal
TCan be expressed as ε
T=γ Δ T can draw formula (3) thus
εv=εa+2εr=εT-εd=γ·ΔT-K·V(t) (3)
In the formula: temperature lift-off value in the cucurbitula is separated in Δ T representative under a certain constant water bath temperature condition.
The 6.5th step: the volume expansivity γ and the matrix of coal contraction coefficient K that calculate coal under the different constant temperatures
Obtain the bulk strain amount ε v of coal under the different constant temperatures by rising water bath temperature
j, separate temperature lift-off value Δ T in the cucurbitula
j, stripping gas scale of construction V
j, wherein j is corresponding temperature, thereby draws volume expansivity γ and the matrix of coal contraction coefficient K of coal under the different constant temperatures, namely
εv
j=γ·ΔT
j–K·V
j (4)
εv
j+1=γ·ΔT
j+1–K·V
j+1 (5)
Simultaneous formula (4) gets with (5) respectively:
γ=(εv
j·V
j+1–εv
j+1·V
j)/(ΔT
j·V
j+1–ΔT
j+1·V
j)
K=(εv
j·ΔT
j+1–εv
j+1·ΔT
j)/(ΔT
j·V
j+1–ΔT
j+1·V
j)。
Good effect of the present invention is: according to cubic deformation amount and the desorption gas amount of coal sample under the different constant temperatures, calculate the thermal expansivity of coal sample is conciliate absorption contracting coefficient, thereby realize the deformation characteristic of coal in the quantitatively evaluating thermal environment, for the regularity of coal seam research of elevated temperature heat evil mine provides important means of testing, also seal in the process reservoir physical-property parameter up for safekeeping and change and play the gordian technique support obtaining coal-seam gas extraction and carbon dioxide geological simultaneously.
Description of drawings
Fig. 1 is the synoptic diagram of measuring method of the present invention.
Marginal data: 1-temperature acquisition instrument; 2-strain acquirement instrument; The 3-gas meter; The 4-gas chromatograph; The 5-temperature sensor; 6-temperature compensation sheet; 7-radial measurement foil gauge; 8-axially measures foil gauge; The 9-water bath; The 10-air valve; 11-protection gas source of the gas; 12-coal sample; 13-separates cucurbitula, 14-T-valve.
Embodiment
As shown in Figure 1, a kind of method of testing of testing matrix of coal shrinkage parameters in the coal sample thermal expansion process may further comprise the steps:
The first step, at first get cylindric coal sample 12, at cylindric coal sample 12 peripheries axially and paste radial measurement foil gauge 7 in the radial position respectively and axially measure foil gauge 8, and arrange the temperature compensation sheet 6 identical with measuring the foil gauge specification separately respectively in the adjacent position of radial measurement foil gauge 7 and axial measurement foil gauge 8; Electrically connect with separately temperature compensation sheet 6 respectively axially measuring foil gauge 8 and radial measurement foil gauge 7, form two these electric bridge half-bridge structures of Huitong;
Second step, the coal sample 12 of this electric bridge half-bridge structure of above-mentioned band Huitong is packed in the solution cucurbitula 13, the lead of two these electric bridge half-bridge structures of Huitong is connected to external strain acquirement instrument 2 by the data-interface on the desorb tank body;
The 3rd step was divided into two-way with the air-path interface of separating cucurbitula 13 tops with T-valve 14, and wherein one road tape splicing has the protection gas source of the gas 11 of air valve 10, and another road is communicated with gas meter 3 and gas chromatograph 4 successively; Temperature sensor 5 is inserted in the solution cucurbitula 13, and temperature sensor 5 is connected with external temperature Acquisition Instrument 1; After assembling finishes, detect the impermeability of separating cucurbitula 13;
In the 4th step, will separate cucurbitula 13 and insert water bath 9; Open air valve 10, source of the gas 11 injects helium to separating in the cucurbitula 13, fill with helium after, separate gases unnecessary in the cucurbitula 13 can gas coming through flowmeters 3 and gas chromatograph 4 be discharged into external environment; Steady when gas meter 3 monitoring gas flows, gas chromatograph 4 detects gas concentration value near after 100%, illustrate that separating in cucurbitula 13 and the coal sample 12 air pocket is discharged pass gas check valve 10 fully;
The 5th step: water temperature in the water bath 9 is risen to design temperature, the temperature T in the temperature acquisition instrument 1 real time record solution cucurbitula 13; The strain data of the axial strain ε a of strain acquirement instrument 2 real time record coal samples 12 and radial strain ε r both direction obtains the bulk strain amount ε v of coal sample 12 under the different temperatures; The stripping gas scale of construction V that discharges in the gas meter 3 real time record solution cucurbitulas 13; Gas chromatograph 4 detects separates composition and the concentration of discharging gas in the cucurbitula 13;
The 6th step: make and separate temperature rising Δ T in the cucurbitula 13 by setting different bath temperatures, obtain under corresponding temperature condition coal sample 12 from original state to the thermal equilibrium process bulk strain amount ε v and the stripping gas scale of construction V of coal sample 12; Utilize ε v and V mathematical physics relation between the two, can be in the hope of the coal sample thermal expansivity γ under the corresponding temperature condition and desorb contraction coefficient K, and the test result under all temperature conditions carried out statistical study, thereby obtain comparatively accurate coal thermal expansivity and desorption gas contraction coefficient thereof.Concrete grammar is as follows:
The 6.1st step: the bulk strain amount ε v that calculates coal sample 12
Bulk strain amount ε v for the coal of elastic deformation can be expressed as formula (1):
εv=εa+2·εr (1)
In the formula (1): ε a represents the axial strain amount, and ε r represents the radial strain amount;
The bulk strain amount ε v that measures foil gauge monitoring coal is the thermal expansion dependent variable ε of coal
TOffset gas desorption and cause matrix of coal contraction strain amount ε
dAfter effective strain amount ε
e, i.e. formula (2)
εv=εe=εa+2ε
r=ε
T-εd (2)
The 6.2nd step: calculate matrix of coal contraction strain amount ε
d
Stripping gas scale of construction V and matrix of coal contraction strain amount ε from coal
dBecome positive correlation:
εd∝V
Because complicated pore texture influence in the coal body, desorption gas flows into the fracture network of coal from breaking away from the matrix of coal surface, and leaving the coal pore texture at last needs certain hour.Therefore, the stripping gas scale of construction V of the coal that observes under the constant environment temperature is that the function of time t is V=V (t).Matrix of coal amount of contraction ε d and stripping gas scale of construction V relation can be expressed as ε d=KV (t), and wherein K is matrix of coal desorb contraction coefficient.
The 6.3rd step: calculate total stripping gas scale of construction V
Discharging gas from separate cucurbitula 13 is potpourri, utilizes gas chromatograph 4 to detect different adsorbed gas components and corresponding concentration C i thereof, and wherein i is the adsorbed gas kind; Concentration according to discharging gas gross V and gas with various calculates various desorption gas discharge rate Vi=VCi, and the total volume of desorption gas is V=∑ VCi so.
The 6.4th step: obtain coal volume of sample dependent variable ε v and stripping gas scale of construction V relation
The thermal expansivity γ of coal is constant, the thermal expansion dependent variable ε of coal
TCan be expressed as ε
T=ε Δ T can draw formula (3) thus
εv=εa+2εr=εT-εd=γ·ΔT-K·V(t) (3)
In the formula: temperature lift-off value in the cucurbitula is separated in Δ T representative under a certain constant water bath temperature condition.
The 6.5th step: the volume expansivity ε and the matrix of coal contraction coefficient K that calculate coal under the different constant temperatures
Obtain the bulk strain amount ε v of coal under the different constant temperatures by step rising water bath 9 temperature
j, separate temperature lift-off value Δ T in the cucurbitula 13
j, stripping gas scale of construction V
j, wherein j is corresponding temperature, thereby draws volume expansivity ε and the matrix of coal contraction coefficient K of coal under the different constant temperatures, namely
εv
j=γ·ΔT
j–K·V
j (4)
εv
j+1=γ·ΔT
j+1–K·V
j+1 (5)
Simultaneous formula (4) gets with (5) respectively:
γ=(εv
j·V
j+1–εv
j+1·V
j)/(ΔT
j·V
j+1–ΔT
j+1·V
j)
K=(εv
j·ΔT
j+1–εv
j+1·ΔT
j)/(ΔT
j·V
j+1–ΔT
j+1·V
j)。
Claims (1)
1. the method for testing of deformation behaviour parameter in the coal sample thermal expansion process is characterized in that, may further comprise the steps:
The first step, the coal sample is processed into right cylinder, at cylindric coal sample periphery axially and paste radial measurement foil gauge and axial measurement foil gauge in the radial position respectively, the foil gauge of same size is set as the temperature compensation foil gauge of axial and radial measurement foil gauge respectively two adjacent locations of measuring foil gauge, the temperature compensation foil gauge is not fixed on the coal sample surface; Axially measure foil gauge and radial measurement foil gauge and connect to form this electric bridge half-bridge structure of two Huitong with separately temperature compensation foil gauge according to the half-bridge mode respectively;
In second step, the above-mentioned coal sample that has this electric bridge half-bridge structure of Huitong is placed on the solution cucurbitula base; The lead of two these electric bridge half-bridge structures of Huitong is connected to external strain acquirement instrument by the data-interface on the desorb tank body;
The 3rd step, an air-path interface separating cucurbitula is connected the protection source of the gas that has air valve, another road air-path interface connects gas meter and gas chromatograph successively; To separate that cucurbitula is built-in goes into temperature sensor, temperature sensor and external temperature Acquisition Instrument are connected; After assembling finishes, detect the impermeability of separating cucurbitula;
In the 4th step, will separate cucurbitula and insert water bath; Open the air valve of protection source of the gas, source of the gas injects helium to separating in the cucurbitula, fill with helium after, in jar unnecessary gas can the gas coming through flowmeter and gas chromatograph be discharged into external environment; When gas meter monitoring gas flow steadily, gas chromatograph detect gas concentration value near 100% after, illustrate that separating in cucurbitula and the coal sample air pocket is discharged the pass gas check valve fully;
The 5th step: water temperature in the water bath is risen to design temperature, the temperature T in the temperature acquisition instrument real time record solution cucurbitula; The axial strain ε a of strain acquirement instrument real time record coal sample and the strain data of radial strain ε r both direction obtain the bulk strain amount ε v of coal sample under the different temperatures; The stripping gas scale of construction V that discharges in the gas meter real time record solution cucurbitula; Gas chromatograph detects separates composition and the concentration of discharging gas in the cucurbitula;
The 6th step: make and separate temperature rising Δ T in the cucurbitula by setting different bath temperatures, obtain under corresponding temperature condition coal sample from original state to the thermal equilibrium process bulk strain amount ε v and the stripping gas scale of construction V of coal sample.Utilize mathematical physics relation between the two, can be in the hope of the coal sample thermal expansivity γ under the corresponding temperature condition and desorb contraction coefficient K, and the test result under all temperature conditions carried out statistical study, thereby obtain comparatively accurate coal thermal expansivity and desorption gas contraction coefficient thereof; Concrete grammar is as follows:
The 6.1st step: calculate coal volume of sample dependent variable ε v
Bulk strain amount ε v for the coal of elastic deformation is expressed as formula (1):
εv=εa+2·εr (1)
In the formula (1): ε a representative axially should be measured, and ε r represents the radial strain amount;
The bulk strain amount ε v that measures foil gauge monitoring coal is the thermal expansion dependent variable ε of coal
TOffset gas desorption and cause matrix of coal contraction strain amount ε
dAfter effective strain amount ε
e, i.e. formula (2)
εv=εe=εa+2ε
r=ε
T-εd (2)
The 6.2nd step: calculate matrix of coal contraction strain amount ε
d
Stripping gas scale of construction V and matrix of coal contraction strain amount ε from coal
dBecome positive correlation:
εd∝V
The coal discharge stripping gas scale of construction V that observes under isoperibol is that the function of heat balance time t is V=V (t); So matrix of coal contraction strain amount ε
dCan be expressed as ε d=KV (t) with stripping gas scale of construction V relation, wherein K is the matrix of coal contraction coefficient;
The 6.3rd step: calculate total stripping gas scale of construction V
The desorption gas component and the corresponding concentration C i thereof that utilize the gas chromatograph analysis to discharge, wherein i is the adsorbed gas classification;
Concentration according to discharging gas flow V and gas with various calculates all kinds of stripping gas scale of construction Vi=VCi, and desorption gas cumulative volume amount is V=∑ VCi so;
The 6.4th step: obtain coal volume of sample dependent variable ε v and stripping gas scale of construction V relation
The thermal expansivity γ of coal is constant, the thermal expansion dependent variable ε of coal
TBe expressed as ε
T=γ Δ T draws formula (3) thus
εv=εa+2εr=εT-εd=γ·ΔT-K·V(t) （3）
In the formula: temperature lift-off value in the cucurbitula is separated in Δ T representative under a certain constant water bath temperature condition;
The 6.5th step: the volume expansivity γ and the matrix of coal contraction coefficient K that calculate coal under the different constant temperatures
Obtain the bulk strain amount ε v of coal under the different constant temperatures by rising water bath temperature
j, separate temperature lift-off value Δ T in the cucurbitula
jWith desorption gas amount V
j, wherein j is corresponding temperature, thereby draws volume expansivity γ and the matrix of coal contraction coefficient K of coal under the different constant temperatures, namely
εv
j=γ·ΔT
j–K·V
j (4)
εv
j+1=γ·ΔT
j+1–K·V
j+1 (5)
Simultaneous formula (4) gets with (5) respectively:
γ=(εv
j·V
j+1–εv
j+1·V
j)/(ΔT
j·V
j+1–ΔT
j+1·V
j)
K=(εv
j·ΔT
j+1–εv
j+1·ΔT
j)/(ΔT
j·V
j+1–ΔT
j+1·V
j)。
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Cited By (5)
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| CN104198237A (en) * | 2014-08-12 | 2014-12-10 | 中国石油天然气股份有限公司 | Coal-bed gas desorption device |
| CN106153668A (en) * | 2016-09-20 | 2016-11-23 | 吉林大学 | The device of aluminium drill pipe line of material constriction coefficient is measured under a kind of low temperature environment |
| CN106353360A (en) * | 2016-10-10 | 2017-01-25 | 中国科学院合肥物质科学研究院 | Testing device for thermal expansion coefficient of irregular-shaped material at low temperature |
| CN111351740A (en) * | 2020-03-12 | 2020-06-30 | 青岛理工大学 | Device and method for measuring inward expansion deformation rate of three-dimensional coal matrix |
| CN114778595A (en) * | 2022-04-27 | 2022-07-22 | 中国矿业大学 | Coal body thermal expansion deformation testing system and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198237A (en) * | 2014-08-12 | 2014-12-10 | 中国石油天然气股份有限公司 | Coal-bed gas desorption device |
| CN106153668A (en) * | 2016-09-20 | 2016-11-23 | 吉林大学 | The device of aluminium drill pipe line of material constriction coefficient is measured under a kind of low temperature environment |
| CN106353360A (en) * | 2016-10-10 | 2017-01-25 | 中国科学院合肥物质科学研究院 | Testing device for thermal expansion coefficient of irregular-shaped material at low temperature |
| CN111351740A (en) * | 2020-03-12 | 2020-06-30 | 青岛理工大学 | Device and method for measuring inward expansion deformation rate of three-dimensional coal matrix |
| CN111351740B (en) * | 2020-03-12 | 2022-06-07 | 青岛理工大学 | Device and method for measuring inward expansion deformation rate of three-dimensional coal matrix |
| CN114778595A (en) * | 2022-04-27 | 2022-07-22 | 中国矿业大学 | Coal body thermal expansion deformation testing system and method |
| CN114778595B (en) * | 2022-04-27 | 2024-01-09 | 中国矿业大学 | System and method for testing thermal expansion deformation of coal |
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