CN104819910A - Experimental device and method for measuring amount of gas adsorbed by large quantity of coal samples under condition of normal pressure - Google Patents
Experimental device and method for measuring amount of gas adsorbed by large quantity of coal samples under condition of normal pressure Download PDFInfo
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Abstract
For the problem that the research on the adsorbing characteristic of coal for gas under the conditions of normal temperature and normal pressure in the prior art is very rare, the invention discloses an experimental device and method for using a large quantity of coal samples to adsorb flue gas of a power plant under the condition of normal pressure and belongs to the technical field of measurement for the gas adsorbing amount of coal samples. The experimental device mainly comprises a pipeline, a gas supplying device, a sealed adsorbing cylinder, a vacuum pump and a data acquisition and detection device. The experimental method mainly comprises the following steps: vacuumizing the coal samples, acquiring the concentration of the flue gas of the power plant before adsorption, enabling the coal samples to reach saturated adsorption under normal temperature and normal pressure and acquiring the concentration of the gas in the adsorbing cylinder after adsorption. The experimental device and method disclosed by the invention have the advantages that the measurement for the saturated adsorption amount of the coal samples for adsorbing the flue gas of the power plant under the temperature and the pressure of a goaf of a mine is simulated; and the basic experimental device is provided for measuring the adsorbing amount of the coal samples for the flue gas of the power plant under the conditions of normal temperature and normal pressure and experimental support is provided for direct injection of the flue gas of the power plant into the goaf to replace traditional injection of N2 and CO2.
Description
Technical field
The invention belongs to and measure coal sample adsorbed gas scale of construction technical field, particularly under a kind of condition of normal pressure, measure experimental provision and the method for the full-page proof amount coal sample adsorbed gas scale of construction.
Background technology
China is coal resources big countries, and along with increasing substantially of coal production efficiency and coal production, cause goaf to leave over a large amount of float coal, coal-mine fire frequently occurs.In addition, the exploitation of coal, utilization and process change time, coal combustion creates a large amount of CO
2gas, due to CO
2a large amount of discharges of gas, cause global warming and cause various extreme climatic phenomenon, so while coal mining, the generation that research can reduce mine disaster can reduce CO again
2the new method of gas emissions is current China problem in the urgent need to address.
In the various greenhouse gases causing climate change, the CO of mankind's activity discharge
2the warming effect produced accounts for 63%, CO of total warming effect that all greenhouse gases produce
2become the maximum gas of climate change effect.As everyone knows, coal CO absorption
2ability be better than absorption N
2, in recent years, along with the development of coal absorption subject, increasing scholar is devoted to adopt CO
2substitute N
2for preventing and extinguishing fire technology.For adapting to the needs of mine fire extinguishing, noble gas is (with N
2and CO
2being main) preventing and extinguishing fire technology becomes one of effective technology measure of control coal seam spontaneous fire gradually.In recent years, (principal ingredient is N to the flue gas having scholar to propose fire coal to produce
2, CO
2) inject unworkable coal seam or goaf, the method can not only replace note nitrogen and the effective prevention and corntrol Conflagration Caused by Coal Self-ignition of energy, saves the energy dissipation because nitrogen processed causes, can also realize CO
2sealing up for safekeeping of gas, reduces CO
2gas discharges in air.
The absorption of coal to gas is mainly physisorption, under the absorption research of coal to gas mostly is and obtains different equalized pressure according to the result of adsorption isotherm experiment, coal is to the adsorbance of gas, and selected device has: IS-100 type gas sorption and desorption isotherm instrument, Xi'an Technology University AST-2000 type full-page proof amount adsorption/desorption emulation experiment instrument etc. that HCA high pressure content method adsorbent equipment, Terra Tek company of the U.S. introduce.Though adsorption isotherm experiment establishes theoretical model and the mathematic(al) representation of sorption isotherm, but up to now, research all adopts the high pressure content method of coal to carry out adsorption isotherm experiment, namely the test that different spot pressures carries out adsorbance is chosen, therefore spot pressure is all choosing higher than in atmospheric scope, so coal is also rarely found to the characterization of adsorption research of gas under normal temperature and pressure conditions.
Summary of the invention
The object of the invention is to be directed to the problem that in prior art, coal is also rarely found to the characterization of adsorption research of gas under normal temperature and pressure conditions, under providing a kind of condition of normal pressure, measure experimental provision and the method for the full-page proof amount coal sample adsorbed gas scale of construction.Thus convenient, that simulate mine goaf accurately temperature and pressure, determine that mechanism is sealed in the absorption of Residual coal in goaf to gas up for safekeeping.
Measure an experimental provision for the full-page proof amount coal sample adsorbed gas scale of construction under condition of normal pressure, comprise pipeline, feeder, sealing adsorbing cylinder, vacuum pump and data acquisition pick-up unit; Described feeder, vacuum pump are connected with sealing adsorbing cylinder respectively by pipeline with data acquisition pick-up unit;
Wherein, described feeder is gas cylinder, and preferably, feeder also comprises gas transfer pump, and gas cylinder is connected by pipeline with gas transfer pump, and in the outlet of gas cylinder, pressure governor is housed;
Described sealing adsorbing cylinder is used for sample of coalingging, and cylinder is provided with tensimeter, gas injection port, degassed mouth and outlet; Feeder is connected by the gas injection port of pipeline with sealing adsorbing cylinder, and vacuum pump is connected with the degassed mouth of adsorbing cylinder by pipeline, and data acquisition pick-up unit is connected with the outlet of adsorbing cylinder by pipeline; Preferably, adsorbing cylinder is stainless steel;
Described data acquisition pick-up unit is gas chromatograph and workstation.
Utilize said apparatus to measure the experimental technique of the full-page proof amount coal sample adsorbed gas scale of construction in atmospheric conditions, comprise the steps:
(1) preparation experiment gas
Simulated experiment gas is made by the component of reality gas to be studied and volume fraction, and with the non-adsorbable gas of coal gas as a setting;
(2) degassed
Check the impermeability of sealing adsorbing cylinder, then the full-page proof amount fine coal sample of drying is put into sealing adsorbing cylinder, after sealing, degassed to adsorbing cylinder with vacuum pump;
(3) gas injection and absorption
Degassed complete after, reach 0.1MPa to injecting gas in adsorbing cylinder to in-cylinder pressure by feeder, then numerical value with the initial volume mark of gas composition to be measured each in gas chromatograph for determination cylinder and before being recorded as absorption;
(4) measure and calculate adsorbance
Because fine coal sample can adsorbed gas, therefore free gas mutually in gas flow with become branch to change in time and change; Therefore, at set intervals, be preferably every 12h, the volume fraction of each component to be measured in utilizing free gas in gas chromatograph for determination adsorbing cylinder mutually, then by the adsorbance computing formula calculating fine coal sample of being derived by the Ideal-Gas Equation to the adsorbance of gas;
As follows according to the Ideal-Gas Equation derivation adsorbance computing formula process:
P
iV
i＝n
iRT
P
KV
K＝n
KRT
Wherein, P
ifor adsorbing the partial pressure of certain gas composition to be measured in front sealing adsorbing cylinder, unit: Pa; V
ifor adsorbing the volume of certain gas composition to be measured in front sealing adsorbing cylinder, unit: m
3; n
ifor adsorbing the amount of substance of certain gas composition to be measured in front sealing adsorbing cylinder, unit: mol; P
ktotal gas pressure in adsorbing cylinder is sealed, unit: Pa before adsorbing; V
kfor volume of gas in sealing adsorbing cylinder, unit: m
3; n
kfor the total amount of substance of sealing absorption gas in the jar, unit: mol; T is system temperature, unit: K; R is the gas law constant of ideal gas, is about 8.314J/ (molK);
Because temperature in adsorption process is constant all the time, and adsorbing cylinder cumulative volume is invariable, and immediately, the ratio of gaseous tension is identical with the ratio of contained amount of substance, that is:
In formula,
the volume fraction of certain gas composition to be measured in adsorbing cylinder is sealed, % before representing absorption;
P can be calculated thus
i:
Above formula being brought into the amount of substance sealing certain gas composition to be measured in adsorbing cylinder before the Ideal-Gas Equation can calculate absorption is:
Above-mentioned formula seals the amount of substance of certain gas composition to be measured in adsorbing cylinder after being also applicable to calculate absorption, that is:
Wherein, n
i' for adsorbing the amount of substance of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: mol; P
i' for adsorbing the partial pressure of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: Pa; V
i' for adsorbing the volume of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: m
3;
for adsorbing the volume fraction of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, %; P
k' be total gas pressure in certain time point sealing adsorbing cylinder after absorption, unit: Pa;
According to the difference of the amount of substance of this gas composition to be measured before and after absorption and then the volume of trying to achieve coal adsorbed gas be again:
Wherein, V be certain time point every gram coal to the adsorption volume of gas, unit: cm
3g
-1; V
mfor molar volume of gas under normal temperature and pressure, 24.5L/mol; M is the quality of coal, unit: g;
Volume fraction before and after the absorption of certain gas composition to be measured by gas chromatograph for determination is brought in above-mentioned formula, namely obtains the amount of coal sample adsorbed gas;
In above-mentioned steps (2), check that the bubble-tight method of sealing adsorbing cylinder is: in adsorbing cylinder after injecting gas, close sealing adsorbing cylinder, if adsorbing cylinder pressure does not change within 24h, impermeability reaches requirement; Wherein, pressure >=3 atmospheric pressure of injecting gas and the maximum maximum pressure being no more than cylinder body and can bearing;
It is Single Point Correction Method that above-mentioned gas chromatograph detects method used.
In the present invention, full-page proof amount is defined as, and the coal sample amount that traditional adsorption instrument uses is very little, and be only several grams to tens grams, method of the present invention can measure the coal sample amount of feather weight to ten feather weight.
The present invention compared with prior art, it is advantageous that
1, invention comprises air supply system, degas system (vacuum pump), flue gas adsorption-desorption system (sealing adsorbing cylinder) and data acquisition system (DAS), its structure is simple, under can be used for the temperature and pressure of simulation mine goaf, coal sample, to the mensuration of power-plant flue gas saturated extent of adsorption, substitutes tradition note N for power-plant flue gas directly being injected goaf
2and note CO
2experiment is provided to support.
2, the absorption numerical value of method mensuration of the present invention is closer to actual conditions.The coal sample amount adopted due to conventional absorbtion instrument is less, and coal adsorbance under normal temperature and pressure conditions is very little, and the adsorbance numerical value therefore under condition of normal pressure is difficult to directly measure, and can only draw according to the numerical simulation calculation of adsorption isothermal.And the adsorbing cylinder volume selected by the present invention is 55L, can test the adsorbability of a large amount of coal sample, provide infrastest device for coal sample measures power-plant flue gas adsorbance at normal temperatures and pressures.
3, data acquisition system (DAS) of the present invention adopts the gas chromatograph with automatic sampling apparatus, can carry out Real-Time Monitoring to the volume fraction of free gas in adsorbing cylinder, adopts autovalve sample introduction can reduce the error of artificial sample introduction, improves experiment accuracy rate.
4, device of the present invention is simple, easy and simple to handle.
5, the present invention can not only detect the adsorbance numerical value of coal to pure gas, can also detect the adsorbance numerical value of coal to two or more gas simultaneously.
Accompanying drawing explanation
The schematic diagram of Fig. 1, experimental provision of the present invention;
Wherein, 1, pipeline, 2, feeder, 3, sealing adsorbing cylinder, 4, vacuum pump, 5, data acquisition pick-up unit, 6, tensimeter, 7, gas injection port, 8, degassed mouth, 9, outlet, 10, gas cylinder, 11, gas chromatograph, 12, workstation, 13, air generator, 14, carrier gas bottle.
Embodiment
Measure an experimental provision for the full-page proof amount coal sample adsorbed gas scale of construction under condition of normal pressure, comprise pipeline, feeder, sealing adsorbing cylinder, vacuum system and data acquisition pick-up unit; Described feeder, vacuum system are connected with sealing adsorbing cylinder respectively by pipeline with data acquisition pick-up unit;
Described feeder comprises gas cylinder, and preferably, feeder also comprises gas transfer pump, and in the outlet of gas cylinder, pressure governor is housed;
Sealing adsorbing cylinder is used for sample of coalingging, and cylinder is equipped with tensimeter, gas injection port, degassed mouth and outlet; Preferably, adsorbing cylinder is stainless steel; Adsorbing cylinder adopts homemade capacity to be the stainless steel cauldron of 55L, and be provided with O-ring seal in adsorbing cylinder to ensure the sealing of adsorbing cylinder, the pressure boundary of adsorbing cylinder is 5MPa; Pressure and vacuum dual-purpose table are for measuring the real-time change of absorption in-cylinder pressure, and range is-0.1MPa ~ 5MPa;
Data acquisition pick-up unit is gas chromatograph and workstation, and gas chromatograph is with full-automatic air source and hydrogen generator, and workstation is with display;
Feeder is connected by the gas injection port of pipeline with sealing adsorbing cylinder, and vacuum pump is connected with the degassed mouth of adsorbing cylinder by pipeline, and data acquisition pick-up unit is connected with the outlet of adsorbing cylinder by pipeline.
Embodiment 1
Measure an experimental provision for the full-page proof amount coal sample adsorbed gas scale of construction under condition of normal pressure, comprise pipeline 1, feeder 2, sealing adsorbing cylinder 3, vacuum pump 4 and data acquisition pick-up unit 5;
Pipeline 1 is high-pressure rubber pipe, and high-pressure rubber pipe internal diameter is the gaseous tension of 3mm, ability 10MPa;
Sealing adsorbing cylinder 3 is stainless steel, for sample of coalingging, adsorbing cylinder 3 is equipped with tensimeter 6, gas injection port 7, degassed mouth 8 and outlet 9, and on gas injection port 7, air-supplying valve is housed, degassed mouth 8 is equipped with degassed valve, outlet 9 is equipped with sample cock; Adsorbing cylinder 3 adopts homemade capacity to be the stainless steel cauldron of 55L, and be provided with O-ring seal in adsorbing cylinder 3 to ensure the sealing of adsorbing cylinder, the pressure boundary of adsorbing cylinder 3 is 5MPa; Tensimeter 6 is pressure and vacuum dual-purpose table, and for measuring the real-time change of absorption in-cylinder pressure, range is-0.1MPa ~ 5MPa;
Feeder 2 is the gas cylinder 10 that pressure governor is equipped with in outlet, gas cylinder 10 is built with simulated experiment gas, pressure governor by gas regulation to the required pressure of experiment, by discharge pump by 1 gas injection port 7 being delivered to adsorbing cylinder 3 by the road of the gas in gas cylinder, and control gas injection rate by the air-supplying valve on adsorbing cylinder 3;
Vacuum pump 4 is vane type vacuum pump, and vacuum pump 4 is connected with the degassed mouth 8 on sealing adsorbing cylinder 3 by pipeline 1, by the degassed Valve controlling rate of air sucked in required on sealing adsorbing cylinder 3;
Data acquisition pick-up unit 5 comprises gas chromatograph 11 and workstation 12, gas chromatograph 11 divides the SP-3400 type gas chromatographicanalyzer of production for Beijing North, workstation 12 divides the BF-2002 chromatographic work station of production for Beijing North, and gas chromatograph 11 is with air generator 13 and hydrogen generator; Gas chromatograph 11 is connected with the outlet 9 of adsorbing cylinder by pipeline 1, is controlled to gas chromatograph sampling by the sample cock on sealing adsorbing cylinder 3; Carrier gas used is determined by gas property to be measured.
When this apparatus is used:
1) to gas injection in sealing adsorbing cylinder 3:
Sealing adsorbing cylinder 3 is sealed, closes the degassed valve on degassed mouth 8 and the sample cock on outlet 9, open the air-supplying valve on gas injection port 7; Regulate the pressure governor in gas cylinder 10 exit by gas regulation in gas cylinder to the required pressure of experiment, by discharge pump, the gas in gas cylinder is delivered in adsorbing cylinder through gas injection port 7, and monitor in-cylinder pressure by the tensimeter 6 on sealing adsorbing cylinder 3 and change.
2) bleed from sealing adsorbing cylinder 3
Sealing adsorbing cylinder 3 is sealed, closes the air-supplying valve on gas injection port 7 and the sample cock on outlet 9, open the degassed valve on degassed mouth 8; Open vacuum pump 4, gas in the jar is extracted out through degassed mouth 8, and monitor in-cylinder pressure change by the tensimeter 6 on sealing adsorbing cylinder 3.
3) sampling from sealing adsorbing cylinder 3
Sealing adsorbing cylinder 3 is sealed, closes the air-supplying valve on gas injection port 7 and the degassed valve on degassed mouth 8, open the sample cock on outlet 9; Gas in the jar enters gas chromatograph 11 by outlet 9, and calculates the volume fraction of each component in gas by workstation 12.
Embodiment 2
Utilize the device of embodiment 1 to measure the experimental technique of the full-page proof amount coal sample adsorbed gas scale of construction in atmospheric conditions, comprise the steps:
(1) take fine coal sample 5kg, put into the dry 6h of drying box;
(2) testing fixture impermeability: open gas injection port, close degassed mouth and outlet, in adsorbing cylinder, inject argon gas to in-cylinder pressure is 1MPa, closes gas injection port, and observe adsorbing cylinder pressure and do not change within 24h, the impermeability of adsorbing cylinder reaches requirement;
(3) preparation experiment gas: prepare containing have an appointment 79% N
2, be that the experimental gas of background gas carries out coal to N with argon gas
2adsorption experiment; Prepare containing have an appointment 16.5% CO
2, be that the experimental gas of background gas carries out coal to CO with argon gas
2adsorption experiment; Prepare containing have an appointment 79% N
2, about 16.5% CO
2and be that the experimental gas of background gas carries out the adsorption experiment of coal to flue gas with argon gas;
(4) degassed: the fine coal sample handled well is put into adsorbing cylinder, adsorbing cylinder is sealed, closes gas injection port and outlet, open degassed mouth, utilize vacuum pump to vacuumize in cylinder, the vacuum tightness read in adsorbing cylinder by the tensimeter on adsorbing cylinder is 0.0004MPa;
(5) gas injection and absorption: degassed complete after, close degassed mouth and vacuum pump, open gas injection port, after reaching 0.1MPa by gas cylinder to injecting gas in adsorbing cylinder to in-cylinder pressure, close gas injection port, and open outlet immediately, gather gas by gas chromatograph and measure the initial volume mark of each gas composition to be measured in cylinder and be recorded as the front numerical value of absorption; The quantivative approach of gas chromatography is Single Point Correction Method;
(6) adsorbance is measured: terminate to experiment from experiment, gas flow in free phase can change, therefore, outlet is opened once every 12h, by the volume fraction of each gas composition to be measured of free phase in gas chromatograph for determination adsorbing cylinder, the quantivative approach of gas chromatography is Single Point Correction Method; And calculate coal to the adsorbance of gas by the Ideal-Gas Equation, as follows according to the Ideal-Gas Equation derivation adsorbance computing formula process:
P
iV
i＝n
iRT
P
KV
K＝n
KRT
Wherein, P
ifor adsorbing the partial pressure of certain gas composition to be measured in front sealing adsorbing cylinder, unit: Pa; V
ifor adsorbing the volume of certain gas composition to be measured in front sealing adsorbing cylinder, unit: m
3; n
ifor adsorbing the amount of substance of certain gas composition to be measured in front sealing adsorbing cylinder, unit: mol; P
ktotal gas pressure in adsorbing cylinder is sealed, unit: Pa before adsorbing; V
kfor volume of gas in sealing adsorbing cylinder, unit: m
3; n
kfor the total amount of substance of sealing absorption gas in the jar, unit: mol; T is system temperature, unit: K; R is the gas law constant of ideal gas, is about 8.314J/ (molK);
Because temperature in adsorption process is constant all the time, and adsorbing cylinder cumulative volume is invariable, and immediately, the ratio of gaseous tension is identical with the ratio of contained amount of substance, that is:
In formula,
the volume fraction of certain gas composition to be measured in adsorbing cylinder is sealed, % before representing absorption;
P can be calculated thus
i:
Above formula being brought into the amount of substance sealing certain gas composition to be measured in adsorbing cylinder before the Ideal-Gas Equation can calculate absorption is:
Above-mentioned formula seals the amount of substance of certain gas composition to be measured in adsorbing cylinder after being also applicable to calculate absorption, that is:
Wherein, n
i' for adsorbing the amount of substance of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: mol; P
i' for adsorbing the partial pressure of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: Pa; V
i' for adsorbing the volume of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: m
3;
for adsorbing the volume fraction of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, %; P
k' be total gas pressure in certain time point sealing adsorbing cylinder after absorption, unit: Pa;
According to the difference of the amount of substance of this gas composition to be measured before and after absorption and then the volume of trying to achieve coal adsorbed gas be again:
Wherein, V be certain time point every gram coal to the adsorption volume of gas, unit: cm
3g
-1; V
mfor molar volume of gas under normal temperature and pressure, 24.5L/mol; M is the quality of coal, unit: g;
Volume fraction before and after the absorption of certain gas composition to be measured by gas chromatograph for determination is brought in above-mentioned formula, namely obtains the amount of coal sample adsorbed gas.
Below for the result of simulation with Xin's pit coal sample absorption flue gas 12h, concrete data are in table 1:
The adsorbance of table 1, coal sample absorption flue gas 12h
Further, before absorption, in-cylinder pressure is 126025Pa, and after absorption 12h, in-cylinder pressure is 116825Pa;
With N
2adsorbance is calculated as example, wherein before absorption
p
k=126025Pa, V
i=55L, R=8.314J/ (molK), T=293.15K,
Then,
After absorption
p
k'=116825PPa, V
i'=55L, R=8.314J/ (molK), T=293.15K,
Then
Then
Namely, under normal temperature and pressure conditions, every gram of coal is to N
2adsorbance be 0.24cm
3; In like manner, CO
2the computing method of adsorbance are also described above.
Embodiment 3
According to the method for enforcement 2, adopt the flue gas in embodiment 2, under normal temperature and pressure conditions, measure the adsorbance after tunnel passing through solution cavity in Taishan mine fine coal sample 5kg difference absorption nitrogen, carbon dioxide and power-plant flue gas 24h.
Specific experiment the results are shown in Table 2.
Embodiment 4
According to the method for enforcement 2, the flue gas in employing embodiment 2 and homemade capacity are the airtight adsorbing cylinder of 100L, under normal temperature and pressure conditions, measure the adsorbance after same Xin's breeze coal sample 12kg difference absorption nitrogen, carbon dioxide and power-plant flue gas 24h.
Specific experiment the results are shown in Table 2.
Embodiment 5
According to the method for enforcement 2, adopt the flue gas in embodiment 2, under normal temperature and pressure conditions, measure the adsorbance after high extra large breeze coal sample 6kg difference absorption nitrogen, carbon dioxide and power-plant flue gas 24h.
Specific experiment the results are shown in Table 2.
Embodiment 6
According to the method for enforcement 2, adopt the flue gas in embodiment 2, under normal temperature and pressure conditions, measure the adsorbance after Anshun breeze coal sample 4kg difference absorption nitrogen, carbon dioxide and power-plant flue gas 24h.
Specific experiment the results are shown in Table 2.
Table 2 embodiment 3 ~ 6 coal sample absorption exhaust gas volumn and CO absorption
2, N
2amount compares
Shown by the result of table 1 and table 2: coal sample gas absorption numerical quantity is in atmospheric conditions very little, much smaller than the saturated adsorption numerical quantity in high pressure content method.Wherein coal sample is to CO
2the adsorbance of gas is greater than coal to N
2adsorbance, but coal sample is to N
2and CO
2the adsorbance of mixed gas is greater than the adsorbance of coal sample to any one pure gas.Under normal temperature and pressure conditions is described, the adsorbance numerical value of coal to power-plant flue gas is greater than coal to single kind N
2or CO
2the adsorptive value of gas, substitutes tradition note N for power-plant flue gas being injected mine goaf
2or note CO
2preventing and extinguishing fire technology provides theory support.
Claims (8)
1. measure an experimental provision for the full-page proof amount coal sample adsorbed gas scale of construction under condition of normal pressure, it is characterized in that, comprise pipeline, feeder, sealing adsorbing cylinder, vacuum pump and data acquisition pick-up unit; Described feeder, vacuum pump are connected with sealing adsorbing cylinder respectively by pipeline with data acquisition pick-up unit.
2. measure the experimental provision of the full-page proof amount coal sample adsorbed gas scale of construction under a kind of condition of normal pressure according to claim 1, it is characterized in that, described feeder is gas cylinder.
3. under a kind of condition of normal pressure according to claim 2, measure the experimental provision of the full-page proof amount coal sample adsorbed gas scale of construction, it is characterized in that, feeder also comprises gas transfer pump, and gas cylinder is connected by pipeline with gas transfer pump, and in the outlet of gas cylinder, pressure governor is housed.
4. measure the experimental provision of the full-page proof amount coal sample adsorbed gas scale of construction under a kind of condition of normal pressure according to claim 1, it is characterized in that, described sealing adsorbing cylinder is provided with tensimeter, gas injection port, degassed mouth and outlet.
5. measure the experimental provision of the full-page proof amount coal sample adsorbed gas scale of construction under a kind of condition of normal pressure according to claim 1, it is characterized in that, described data acquisition pick-up unit is gas chromatograph and workstation.
6. measure an experimental technique for the full-page proof amount coal sample adsorbed gas scale of construction under condition of normal pressure, adopt experimental provision according to claim 1, it is characterized in that, comprise the steps:
(1) preparation experiment gas
Simulated experiment gas is made by the component of reality gas to be studied and volume fraction, and with the non-adsorbable gas of coal gas as a setting;
(2) degassed
Check the impermeability of sealing adsorbing cylinder, then the full-page proof amount fine coal sample of drying is put into sealing adsorbing cylinder, after sealing, degassed to adsorbing cylinder with vacuum pump;
(3) gas injection and absorption
Degassed complete after, reach 0.1MPa to injecting gas in adsorbing cylinder to in-cylinder pressure by feeder, then numerical value with the initial volume mark of gas composition to be measured each in gas chromatograph for determination cylinder and before being recorded as absorption;
(4) measure and calculate adsorbance
The volume fraction of each component to be measured in utilizing free gas in gas chromatograph for determination adsorbing cylinder mutually at set intervals, then calculate fine coal sample to the adsorbance of gas by the adsorbance computing formula of being derived by the Ideal-Gas Equation;
This adsorbance computing formula is:
Wherein, V be certain time point every gram coal to the adsorption volume of gas, unit: cm
3g
-1; n
ifor adsorbing the amount of substance of certain gas composition to be measured in front sealing adsorbing cylinder, unit: mol; n
i' for adsorbing the amount of substance of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: mol; V
mfor molar volume of gas under normal temperature and pressure, 24.5L/mol; M is the quality of coal, unit: g;
for adsorbing the volume fraction of certain gas composition to be measured in front sealing adsorbing cylinder, %; V
ifor adsorbing the volume of certain gas composition to be measured in front sealing adsorbing cylinder, unit: m
3; P
ktotal gas pressure in adsorbing cylinder is sealed, unit: Pa before adsorbing;
for adsorbing the volume fraction of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, %; V
i' for adsorbing the volume of certain gas composition to be measured in rear certain time point sealing adsorbing cylinder, unit: m
3; P
k' be total gas pressure in certain time point sealing adsorbing cylinder after absorption, unit: Pa; T is system temperature, unit: K; R is the gas law constant of ideal gas, is 8.314J/ (molK).
7. under a kind of condition of normal pressure according to claim 6, measure the experimental technique of the full-page proof amount coal sample adsorbed gas scale of construction, it is characterized in that, in described step (2), check that the impermeability method of sealing adsorbing cylinder is: in adsorbing cylinder after injecting gas, close sealing adsorbing cylinder, if adsorbing cylinder pressure does not change within 24h, impermeability reaches requirement;
Wherein, pressure >=3 atmospheric pressure of injecting gas and the maximum maximum pressure being no more than cylinder body and can bearing.
8. measure the experimental technique of the full-page proof amount coal sample adsorbed gas scale of construction under a kind of condition of normal pressure according to claim 6, it is characterized in that, described gas chromatograph for determination method used is Single Point Correction Method.
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