CN103691579B - Coal mine return air stream low concentration gas multistage purification experimental rig - Google Patents
Coal mine return air stream low concentration gas multistage purification experimental rig Download PDFInfo
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- CN103691579B CN103691579B CN201310669142.2A CN201310669142A CN103691579B CN 103691579 B CN103691579 B CN 103691579B CN 201310669142 A CN201310669142 A CN 201310669142A CN 103691579 B CN103691579 B CN 103691579B
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Abstract
The present invention relates to coal mine return air stream low concentration gas multistage purification experimental rig, the purification problem of effective solution low concentration gas, method is, motor is equipped with in the bottom of experimental box body, the rotating shaft of motor there is the fan blade be contained in experimental box body, be equipped with outside experimental box body and respectively air velocity transducer be installed, pressure sensor, the operation support of gas concentration sensor, operation support is by main shaft vertically arranged on base and base, and the mechanical arm on main shaft is formed, there is venthole side, experimental box body bottom, the pipeline of venthole is equipped with air exhauster, escape pipe is arranged at the top of experimental box body, the air admission hole of the opposite side that bottom is corresponding with venthole is equipped with main flow conduit, main flow conduit is connected with gas and vapor permeation casing, gas and vapor permeation casing connects the pipeline of gas pot respectively through triple valve, the pipeline of frequency conversion type air blast, the present invention is easy for operation, being effective to purifies to low concentration gas tests, guarantee making full use of and production safety of resource.
Description
Technical field
The present invention relates to mining (colliery) equipment, particularly a kind of coal mine return air stream low concentration gas multistage purification experimental rig.
Background technology
Along with coal mining develops to deep, coal seam gas-bearing capacity increases, gas pressure increases, and resource and environmental requirement, in colliery, gas pumping puts more effort, however, in colliery, gas pumping utilizes the total amount only 10%-20% of gas in coal seam, most gas in coal seam are then parse when coal mining, and enter in air after being diluted by mine ventilation, data shows, China's wind resource assessment amount accounts for more than 80% of coal-bed gas total amount, the principal character of this part gas is that concentration is low, be generally 0.6%-1%, and fully mix with mine return air stream, can not directly utilize, cause the huge wasting of resources and environmental pollution.The purification technique of current low concentration gas mainly contains pressure-variable adsorption, membrane separation technique and low-temperature liquefaction technology, pressure-variable adsorption gas purification technique, great majority are also in the developmental research stage, pressure swing adsorption utilizes the equilibrium adsorption capacity of adsorbent to raise the characteristic increased with partial component pressure, carries out pressurized adsorbent, decompression desorption.Pressure swing adsorption is considered to the technology of comparative maturity at present, have and become the device of series available, but, its application in gas purification field depends primarily on its economic rationality, for low concentration, even the purification process of the methane gas of extremely low concentration is complicated, and methane (CH required before being separated
4) concentration is higher, be not suitable for the large and gas that concentration is low of coal mine return air amount and purify, economy is not high, and use value is little; Membrane separation technique is selective is separating medium through film, certain motive force (as pressure differential, concentration difference, potential difference etc.) utilizing film both sides to exist, with making feed side compositional selecting through film, and the object of reached separation, purifying.Although industrially use to some extent, based on the feature that coal mine return air amount is large, if carry out separating-purifying, consume energy considerably beyond the methane energy obtained, very uneconomical; Conventional coal gas gasification system is applicable to not containing the high concentration coal bed gas of a large amount of nitrogen oxygen composition, is not suitable for the large and gas that concentration is low of coal mine return air amount especially and purifies; Therefore, the purification (experiment) how effectively solving low concentration gas is the technical problem needing conscientiously to solve.
Summary of the invention
For above-mentioned situation, for solving the defect of prior art, the object of the present invention is just to provide a kind of coal mine return air stream low concentration gas multistage purification experimental rig, effectively can solve purification (experiment) problem of low concentration gas.
The technical scheme that the present invention solves is, comprise experimental box body, motor and sensor, adjustable motor is equipped with in the bottom of experimental box body, the rotating shaft of motor there is the fan blade be contained in experimental box body, form the air whirl field structure of varying strength, experimental box body perisporium has multiple peephole and observation window, observation window is for the situation of change of the rotation and air-flow of observing casing internal fan, be equipped with outside experimental box body and respectively air velocity transducer be installed, pressure sensor, the operation support of gas concentration sensor, operation support is by main shaft vertically arranged on base and base, and the mechanical arm that main shaft circumferentially rotates is formed, air velocity transducer, pressure sensor, gas concentration sensor is contained on mechanical arm respectively, stretch in experimental box body by peephole, realize the wind speed in experimental box body, pressure, gas density is tested, air velocity transducer, pressure sensor, the data of gas concentration sensor test reach the display instrument display be placed on experimental box body by data wire, storage and analyzing test data is directly read by display instrument, be arranged on bottom experimental box body on bracing frame, for fixing and stable casing, ensure result of use, side, experimental box body bottom offers venthole, the pipeline of venthole is equipped with air exhauster, for extracting bottom low-concentration methane gas, escape pipe is arranged at the top of experimental box body, escape pipe is for collecting high concentration gas gas, the air admission hole of the opposite side that experimental box body bottom is corresponding with venthole is equipped with main flow conduit, main flow conduit is provided with the first gas flowmeter, main flow conduit is connected with gas and vapor permeation casing, gas and vapor permeation casing is hinged with the pipeline of the gas pot of high concentration respectively through triple valve, the pipeline of the frequency conversion type air blast of fresh air is provided, high concentration gas gas and live gas are entered in gas and vapor permeation casing mix, become low-concentration methane gas, enter in experimental box body through main flow conduit again, open motor can realize testing low concentration gas multistage purification.
Novel structure of the present invention is unique, easy for operation, and being effective to purifies to low concentration gas tests, and guarantees making full use of and production safety of resource, has significant economic and social benefit.
Accompanying drawing explanation
Fig. 1 is structural front view of the present invention.
Fig. 2 is the annexation figure of sensor of the present invention and display.
Fig. 3 is sensor operations rack assumption diagram of the present invention.
Fig. 4 exports methane concentration variation diagram when being motor of the present invention unlatching up and down.
Fig. 5 is lower production well methane concentration variation diagram in the present invention.
Detailed description of the invention
Below close accompanying drawing to elaborate to the specific embodiment of the present invention.
Shown in Fig. 1-3, the present invention includes experimental box body, motor and sensor, adjustable motor 6 is equipped with in the bottom of experimental box body 1, the rotating shaft of motor 6 there is the fan blade 7 be contained in experimental box body, form the air whirl field structure of varying strength, experimental box body perisporium has multiple peephole 2 and observation window 3, observation window is for the situation of change of the rotation and air-flow of observing casing internal fan, be equipped with outside experimental box body and respectively air velocity transducer be installed, pressure sensor, the operation support of gas concentration sensor 23, operation support is by main shaft 20 vertically arranged on base 22 and base, and the mechanical arm 21 that main shaft circumferentially rotates is formed, air velocity transducer, pressure sensor, gas concentration sensor is contained on mechanical arm 21 respectively, stretch in experimental box body by peephole, realize the wind speed in experimental box body, pressure, gas density is tested, air velocity transducer, pressure sensor, the data of gas concentration sensor test reach by data wire the display instrument 24 be placed on experimental box body and show, storage and analyzing test data is directly read by display instrument, be arranged on bracing frame 8 bottom experimental box body, for fixing and stable casing, ensure result of use, side, experimental box body bottom offers venthole 5, air exhauster 4 pipeline of venthole 5 is equipped with, for extracting bottom low-concentration methane gas, escape pipe 10 is arranged at the top of experimental box body, escape pipe 10 is for collecting high concentration gas gas, the air admission hole 9 of the opposite side that experimental box body 1 bottom is corresponding with venthole 5 is equipped with main flow conduit 19, main flow conduit 19 is provided with the first gas flowmeter 18, main flow conduit 19 is connected with gas and vapor permeation casing 17, gas and vapor permeation casing 17 is hinged with the pipeline 12a of the gas pot 11 of high concentration respectively through triple valve 16, the pipeline 12b of the frequency conversion type air blast 15 of fresh air is provided, high concentration gas gas and live gas are entered in gas and vapor permeation casing 17 mix, become low-concentration methane gas, enter in experimental box body 1 through main flow conduit 19 again, open motor can realize testing low concentration gas multistage purification.
In order to ensure result of use, the pipeline 12a of described gas pot being equipped with the flowmeter 13 of gas, the pipeline 12b of frequency conversion type air blast being equipped with the second gas flowmeter 14; Described air admission hole 9 place is provided with the pressure gauge 25 of test pressure; The pipeline 12a of the gas pot 11 of described high concentration is equipped with the control valve 26 of flow near gas pot place, for controlling from gas pot high concentration gas flow out.
Air velocity transducer, pressure sensor, gas concentration sensor can be installed and used simultaneously, also use can be installed separately, different depending on the needs of test, therefore, sensor can be comprise air velocity transducer, pressure sensor, gas concentration sensor, also can be each sensor, therefore use same Reference numeral 23.
As can be seen from said structure, the present invention is the experimental rig of a kind of coal mine return air stream low concentration gas multistage purification basic research, comprises experimental box body 1, be provided with Frequency Adjustable motor 6 in the bottom of casing, motor 6 be furnished with the fan blade 7 of different model, the combination of motor and fan blade is in order to provide the air whirl field of varying strength, casing surrounding evenly offers peephole 2, in order to install air velocity transducer, pressure sensor, gas concentration sensor 24, sensor can stretch in casing, to such an extent as to the parameter of the gas of any position of box house can be tested, sensor a special crosshead 20 is installed, be parallel to the tripod that horizon evenly piles bottom crosshead 20, in order to support operation frame 20, the main shaft of crosshead 20 is provided with can the mechanical arm 21 of surrounding activity, test casing 1 put into by the sensor 23 that mechanical arm 21 clamps, complete test job, display instrument 25 is circumscribed with at sensor 24, display instrument 25 can directly read, storage and analyte sensors 24 are in casing build-in test data, casing 1 offers observation window 3, observation window 3 can observe the rotation of casing internal fan and the situation of change of air-flow, bracing frame 8 is settled, in order to the work that static housing can be stable bottom casing 1, air admission hole 9 and venthole 5 are offered in casing 1 bottom, are connected to air exhauster 4 outside venthole 5, and in order to extract the low mist of bottom gas density, the top of casing 1 offers venthole 10, and venthole 10 is used for collecting the high mist of gas density, casing 1 lower air inlet 9 is circumscribed with main flow conduit 19, gas pot 11 is once provided with according to the direction of air-flow, the gas of high concentration is mainly provided, frequency conversion type air blast 15 is in order to provide ozone, methane gas enters triple valve 16 along arm 12, arm 12 is provided with flowmeter 13, fresh air is also to enter triple valve 16 along arm, arm is provided with flowmeter 14, methane gas and fresh air enter gas and vapor permeation casing 17 inside and fully mix, main pipeline 19 is entered from mixing casing relatively uniform gas out, main pipeline 19 is provided with flowmeter 18, the pressure gauge of test pressure is being installed close to entrance 9 place, in order to test access pressure, high concentration gas is controlled from the discharge the gas pot of high concentration by control valve 26, and show metering by the flowmeter of gas, realize different flow and form the different gaseous mixture of multistage concentration from fresh air, to be applied to experiment.
For ensureing the safety of experimentation, first the exhaust outlet 10 at test casing top was opened before on-test, then inside test casing, wash away the mist of fresh air and gas, after gas to be mixed is full of whole device, start the methane concentration detecting upper venthole 10 and lower production well 5 with firedamp sensor, if following table is when in test casing, fan blade does not rotate and rotates, the methane concentration of upper venthole and lower production well during different time.There is the reason of technical elements, do not describing test box house methane concentration along with the situation of change of time and the inner methane concentration of experimental box body and the physical relationship between mixture pressure and flow velocity here.
Experiment one: CH4 is opened motor and is extracted experiment
Step one, connect frequency conversion type air blast and gas pot by threeway, flow instrument is installed in threeway exit;
Step 2, adjustment frequency conversion type air blast and gas pot, make threeway exit CH4 concentration about 0.5%, then survey its wind speed;
Step 3, write down the position of the rotation of frequency conversion type air blast and gas pot rotary switch, close frequency conversion type air blast machine after carrying out mark and gas pot (could utilize respective institute band Pressure gauge scale to mark?)
The outlet of step 4, connecting tee and closed container;
Step 5, drive frequency conversion type air blast and rotary switch to mark position (scale), then open gas pot and revolve and turn on and close to mark position (scale), finally open frequency conversion type motor;
Step 6, after 3 minutes, start to record data, in table one, correspondence is taken out stitches Fig. 4.
Test two CH4 disable motors and extract experiment
Step one, connect frequency conversion type and gas pot by threeway, flow instrument is installed in threeway exit;
Step 2, adjustment frequency conversion type air blast and gas pot, make threeway exit CH4 concentration about 0.5%, then survey its wind speed;
Step 3, write down the position of the rotation of frequency conversion type air blast and gas pot rotary switch, after carrying out mark, close frequency conversion type air blast and gas pot; (respective institute band Pressure gauge scale could be utilized to mark?)
The outlet of step 4, connecting tee and closed container;
Step 5, drive frequency conversion type air blast and rotary switch to mark position (scale), then open gas pot and rotary switch to mark position (scale);
Step 6, after 3 minutes, start to record data, see attached list two, correspondence is taken out stitches Fig. 5.
Motor opened by table one
Table two disable motor
When motor is opened, as seen from Figure 4: when inlet gas concentration is 0.5%, writing time from 1 minute to the 8th minute, the concentration of venthole methane is increasing always, and maximum reaches 0.85%; The concentration of interior lower production well methane is reducing always during this period of time, and minimum of a value is 0.32%.After 8 minutes, the concentration of upper lower production well methane tends towards stability, 2.656 times of lower production well methane concentration when now going up venthole methane concentration.When motor cuts out, as seen from Figure 5, writing time from 1 minute to the 8th minute, the concentration of venthole methane is increasing always, and tends towards stability gradually; Lower production well methane concentration is reducing always, also tends towards stability gradually, because the proportion containing variable concentrations gas is different, realizes natural layering gradually, and when stablizing, the ratio of upper lower production well methane concentration is 1.67 times.Comparison diagram 4 and Fig. 5 known, the vortex field of opening motor generation is remarkable to the refining effect of methane, and all achieves identical or close result through repeated multiple times experiment, shows that experimental provision succeeds, having very strong practical value, is the innovation on gas multistage purification experimental facilities.
Claims (1)
1. a coal mine return air stream low concentration gas multistage purification experimental rig, comprise experimental box body, motor and sensor, it is characterized in that, adjustable motor (6) is equipped with in the bottom of experimental box body (1), the rotating shaft of motor (6) there is the fan blade (7) be contained in experimental box body, form the air whirl field structure of varying strength, experimental box body perisporium has multiple peephole (2) and observation window (3), observation window is for the situation of change of the rotation and air-flow of observing casing internal fan, be equipped with outside experimental box body and respectively air velocity transducer be installed, pressure sensor, the operation support of gas concentration sensor (23), operation support is by vertically arranged main shaft (20) on base (22) and base, and the mechanical arm that main shaft circumferentially rotates (21) is formed, air velocity transducer, pressure sensor, gas concentration sensor is contained on mechanical arm (21) respectively, stretch in experimental box body by peephole, realize the wind speed in experimental box body, pressure, gas density is tested, air velocity transducer, pressure sensor, the data of gas concentration sensor test reach display instrument (24) display be placed on experimental box body by data wire, storage and analyzing test data is directly read by display instrument, be arranged on bracing frame (8) bottom experimental box body, for fixing and stable casing, ensure result of use, side, experimental box body bottom offers venthole (5), air exhauster (4) pipeline of venthole (5) is equipped with, for extracting bottom low-concentration methane gas, escape pipe (10) is arranged at the top of experimental box body, escape pipe (10) is for collecting high concentration gas gas, the air admission hole (9) of the opposite side that experimental box body (1) bottom is corresponding with venthole (5) is equipped with main flow conduit (19), main flow conduit (19) is provided with the first gas flowmeter (18), main flow conduit (19) is connected with gas and vapor permeation casing (17), gas and vapor permeation casing (17) is hinged with the pipeline (12a) of the gas pot (11) of high concentration respectively through triple valve (16), the pipeline (12b) of the frequency conversion type air blast (15) of fresh air is provided, high concentration gas gas and live gas are entered in gas and vapor permeation casing (17) mix, the flowmeter (13) of gas the pipeline (12a) of gas pot is equipped with, the pipeline (12b) of frequency conversion type air blast is equipped with the second gas flowmeter (14), air admission hole (9) place is provided with the pressure gauge (25) of test pressure, the pipeline (12a) of the gas pot (11) of high concentration is equipped with the control valve (26) of flow near gas pot place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310669142.2A CN103691579B (en) | 2013-12-07 | 2013-12-07 | Coal mine return air stream low concentration gas multistage purification experimental rig |
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| CN201310669142.2A CN103691579B (en) | 2013-12-07 | 2013-12-07 | Coal mine return air stream low concentration gas multistage purification experimental rig |
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| CN103691579B true CN103691579B (en) | 2015-08-05 |
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| CN108363422A (en) * | 2018-03-07 | 2018-08-03 | 河北工程大学 | A kind of mixed air-conditioning control system and method for methane |
| CN113062706A (en) * | 2021-04-06 | 2021-07-02 | 中南大学 | Coal seam gas extraction system and method |
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| JP4087117B2 (en) * | 2002-01-18 | 2008-05-21 | 東京瓦斯株式会社 | Isotope gas separation method and isotope gas separation apparatus |
| US20070227357A1 (en) * | 2006-03-31 | 2007-10-04 | Mcdermott Wayne T | Turbomolecular pump system for gas separation |
| CN202273704U (en) * | 2011-10-28 | 2012-06-13 | 山西建工申华暖通设备有限公司 | Gas concentration and pressure control system |
| CN202398138U (en) * | 2011-12-29 | 2012-08-29 | 河南城建学院 | Simple pressure-reducing sublimating purifying device |
| CN202849385U (en) * | 2012-11-06 | 2013-04-03 | 哈尔滨商业大学 | Device for safely and quantitatively collecting and purifying bio-methane in laboratory |
| CN203711165U (en) * | 2013-12-07 | 2014-07-16 | 河南理工大学 | Coal mine return wind current low-concentration gas multi-stage purification test device |
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