CN102392675B - Method and device for collecting ventilation air methane on top of diffuser of main fan of coal mine - Google Patents
Method and device for collecting ventilation air methane on top of diffuser of main fan of coal mine Download PDFInfo
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- CN102392675B CN102392675B CN201110234290.2A CN201110234290A CN102392675B CN 102392675 B CN102392675 B CN 102392675B CN 201110234290 A CN201110234290 A CN 201110234290A CN 102392675 B CN102392675 B CN 102392675B
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- diffuser
- wind
- collecting cover
- coal mine
- collecting
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- 239000003245 coal Substances 0.000 title claims abstract description 45
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000009423 ventilation Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 24
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention discloses a method and a device for collecting ventilation air methane on the top of a diffuser of a main fan of a coal mine. The device comprises an air-collecting hood, an air-collecting pipeline and connecting supports, the air-collecting hood is fixed on the extension line of the air flow direction of the outlet of the top of the diffuser of the main fan of the coal mine by the connecting supports, and the air-collecting pipeline is connected with the outlet of the air-collecting hood. The air-collecting hood utilizes the loss of the kinetic energy of ventilation to fulfill the process of ventilation air methane collection, the normal working condition of the fan of the coal mine cannot be affected, new energy consumption is not generated as well, the coal mine methane utilization rate is increased, and the atmospheric environment is protected. The structure of the collecting device is simple and practical, the device is convenient to mount, the collection cost is low, the benefit of recovery is high, and the device is applicable to both common centrifugal fans and axial fans in coal mines.
Description
Technical field
The present invention relates to a kind of collection wind method, particularly a kind of impact under the prerequisite of coal mine main ventilator operating mode, can effectively collect method and the device of coal mine main ventilator diffuser top ventilation air gas, belongs to corollary equipment field, colliery.
Background technology
Research shows, the mine gas of China's overwhelming majority is that the form by weary wind enters atmosphere.Data demonstration, within 2010, China's coal-mine gas emission is about 20,000,000,000 m
3left and right, outburst amount is equivalent to have every year the standard coal of 1,800 ten thousand tons of crude oil or 3,000 ten thousand tons to be wasted.Moreover, the greenhouse effect that in weary wind, methane produces are CO
221 times, the damage capability of atmospheric ozone layer is about to CO
27 times.Coal mine wind-lack gas is directly discharged in atmosphere, has caused on the one hand the serious waste of limited non-renewable resources, on the other hand, aggravated atmosphere pollution and greenhouse gases effect.
Since the nineties in 20th century, in order to reduce effective utilization of greenhouse gas emissions and clear energy sources, both at home and abroad research institution has carried out exploitation and the application study that coal mine wind-lack gas utilizes technology.Mine air-lack mash gas utilize technology in all relate to the collection to coal mine methane gas, and the research of coal mine methane collection wind is as the exploitation of gas beneficiation technologies and the top link of application, in the situation that not affecting main fan in mine operating mode, realize docking of main fan in mine diffuser air outlet and wind-drive device and pipeline, coal mine wind-lack gas enrichment with utilize technology in have great importance.
Summary of the invention
In view of above-mentioned existing situation, the present invention aims to provide a kind of can impact under the prerequisite of coal mine main ventilator operating mode in minimum degree, utilize the kinetic energy of blower fan diffuser top exit loss, effectively and farthest collect the method and apparatus of coal mine wind-lack gas.
The present invention is achieved through the following technical solutions:
The method of collecting ventilation air methane on top of diffuser of main fan of coal mine, along the wind direction fixed set fan housing of coal mine main ventilator diffuser top exit, makes to keep between wind-collecting cover and diffuser top exit certain distance that is connected; The outlet of wind-collecting cover is communicated with duct set road, and the wind-collecting cover that utilizes the kinetic energy rejection of coal mine main ventilator diffuser top exit and have a smooth inner wall carries out ventilation air gas collection, and after the transmission of duct set road, realizes the continuous collection process of ventilation air gas.
The duct set road of described employing is front thick rear thin reducer pipe, and it is smooth smooth that reducer pipe inwall keeps.
Described wind-collecting cover inlet area is:
S
collection: S
expand=Q
collection: Q
expand
S
collection---the inlet area of wind-collecting cover; S
expand---the discharge area of diffuser; Q
collection---the collection air quantity of wind-collecting cover;
Q
expand---the exhaust air rate of diffuser outlet.
The distance of described wind-collecting cover and diffuser top exit is 1-S rice, and the design formulas of S is:
Wherein, the flow of Q-jet main paragraph;
Q
0the flow of-jet initial segment;
R
0-diffuser outlet equivalent radius
Length and the width of A, the outlet of B-diffuser:
On s-jet axis, wind-collecting cover is apart from the axial distance of diffuser outlet;
α-turbulivity;
Get Q/Q
0≈ 1.
A kind of device of collecting ventilation air methane on top of diffuser of main fan of coal mine, comprise wind-collecting cover, duct set road and connection bracket, duct set road is connected in the outlet of wind-collecting cover, wind-collecting cover is fixed on by connection bracket on the wind direction extended line of coal mine main ventilator diffuser top exit, and wind-collecting cover inner surface is smooth curve.
Described duct set road is reducer pipe, and the large end of reducer pipe is connected in the outlet of wind-collecting cover.
Described wind-collecting cover is corresponding to vertical direction or the oblique upper of diffuser top exit.
Described connection bracket is the connecting screw rod of adjustable length, and the two ends of connecting screw rod are connected on the entrance of diffuser top exit and wind-collecting cover.
The method and apparatus of collecting ventilation air methane on top of diffuser of main fan of coal mine of the present invention, utilizes and is fixed on the wind-collecting cover on coal mine main ventilator diffuser top exit wind direction extended line, and the ventilation air gas of discharging is collected.Its method; fully excavated and discharged the kinetic energy that weary wind has; under the prerequisite that does not affect coal mine main ventilator operating mode and consume without outside resources; utilize kinetic energy rejection; by wind-collecting cover and duct set road, automatically collect to greatest extent coal mine methane; realize the regathering of ventilation air gas, recycling process, improved the utilization rate of coal mine gas, protected atmospheric environment.Its whole gathering-device, simple in structure, practical, easy for installation, collection process does not produce energy consumption, and compiling costs is low, reclaims high efficiency, all applicable for centrifugal fan common in colliery and axial fan.
Accompanying drawing explanation
Fig. 1 is structural representation one of the present invention;
Fig. 2 is structural representation two of the present invention.
The specific embodiment
The method of collecting ventilation air methane on top of diffuser of main fan of coal mine of the present invention; its main purpose is: guaranteeing coal mine production safety, do not affecting under the prerequisite of coal mine main ventilator operating mode; ventilation air gas is carried out to effective Collection and use, reaching energy conservation, utilize the energy, the object of protection of the environment.Detailed process comprises:
First, along the wind direction fixed set fan housing of coal mine main ventilator diffuser top exit, make to keep between wind-collecting cover and diffuser top exit certain distance that is connected.
Wherein, wind-collecting cover inwall keeps streamlined curve, along the fixing wind-collecting cover of the wind direction of diffuser top exit, can be that wind-collecting cover entrance and diffuser top exit are perpendicular, or wind-collecting cover entrance and diffuser top exit keep the certain distance that mutually staggers between the two of orthogonal while, so that wind-collecting cover is positioned on the extended line of diffuser top exit wind direction all the time, guarantee that wind-collecting cover position is all the time in optimum state, raising collection efficiency.And the size of wind-collecting cover inlet area is to calculate according to following formula:
S
collection: S
expand=Q
collection: Q
expand
Wherein, S
collection: the inlet area of wind-collecting cover; S
expand: the discharge area of diffuser; Q
collection: the collection air quantity of wind-collecting cover; Q
expand: the exhaust air rate of diffuser outlet.Like this, just can calculate smoothly the size of wind-collecting cover inlet area according to diffuser discharge area and exhaust air rate, thereby guarantee collection air quantity.
In the time of due to collection ventilation air gas, also need to guarantee the nominal situation of coal mine main ventilator, between wind-collecting cover entrance and diffuser top exit, need the distance that is connected that keeps certain, like this, a large amount of weary wind could normally be discharged, and is unlikely to affect the normal ventilation process in colliery.The distance of wind-collecting cover and diffuser top exit is set to 1-S rice conventionally, and wherein, 1 meter of lower limit is empirical value, and the spacing of 1 meter is minimum mounting distance, fan condition is exerted an influence preventing, upper limit S can calculate according to formula, and formula is:
Wherein, the flow of Q-jet main paragraph; Q
0the flow of-jet initial segment; r
0-diffuser outlet equivalent radius
length and the width of A, the outlet of B-diffuser; On s-jet axis, wind-collecting cover is apart from the axial distance of diffuser outlet; α-turbulivity, also means the characteristic coefficient of jet flow structure, generally by experiment, is determined.Here, due to substantially equal with main paragraph boundary flow at jet initial segment, therefore get Q/Q
0≈ 1, by r
0after substitution formula, can calculate the value of S, determine the upper limit of wind-collecting cover and diffuser top exit distance, while preventing from collecting ventilation air gas, outgoing is distinguished and admirable is involved in air, has guaranteed the reliability of wind-collecting cover collection wind process.
For axial fan conventional in colliery, wind-collecting cover is installed on the oblique upper position being staggered with diffuser top exit, between the two, keep mutually vertical, like this, the weary wind of being discharged by diffuser top exit lopsidedness could just in time be collected by wind-collecting cover simultaneously.And for centrifugal fan, because weary wind is from positive discharge of whole diffuser outlet, so wind-collecting cover is fixed on the top of the upright position relative with diffuser top exit.
Then, the outlet of wind-collecting cover is communicated with duct set road, the wind-collecting cover that utilizes the kinetic energy rejection of the weary wind of coal mine main ventilator diffuser top exit and have a smooth inner wall carries out ventilation air gas collection, and after the transmission of duct set road, forms the continuous collection process of ventilation air gas.
Thin reducer pipe after thick before duct set road adopts, it is smooth smooth that reducer pipe inwall keeps, and makes weary wind transport process more smooth and easy.
In actual ventilation air gas collection process, on the one hand, weary wind, by continuous discharge diffuser top exit, has guaranteed the air draft needs of inside, colliery; On the other hand, the ventilation air gas of discharge is constantly collected by wind-collecting cover, after duct set road transmits, is sent in corresponding post-processed device, thereby has completed the recycling process of ventilation air gas.Its collection process does not produce any energy consumption, and the kinetic energy rejection that only relies on diffuser top exit to discharge weary wind transmits, and collection process is simple, convenient, transmits safety, reliable, with low cost.
The colliery use axial fan of take is example, and as shown in Figure 1, a kind of device of collecting ventilation air methane on top of diffuser of main fan of coal mine, comprises wind-collecting cover 2, duct set road 3 and connection bracket 4.Duct set road 3 is reducer pipe, and the large end of reducer pipe is connected in the outlet of wind-collecting cover 2, and the post-processed device after the small end of reducer pipe is collected with weary wind is connected.The inner surface in wind-collecting cover 2 and duct set road 3 is smooth curve, like this, can reduce the resistance of collection wind.Wind-collecting cover 2 is fixed on the wind direction extended line of coal mine main ventilator diffuser top exit 1 by connection bracket 4, because the top exit 1 of axial fan diffuser is when the air draft, weary wind is discharged by the lopsidedness that exports 1, therefore the wind-collecting cover 2 connecting is perpendicular to diffuser top exit 1, and with outlet 1 certain distance that mutually staggers, be positioned at the oblique upper of diffuser top exit 1, thereby guaranteed collection wind best results.And be to guarantee that diffuser top exit 1 is relative fixing with the position between wind-collecting cover entrance, connection bracket 4 is selected the connecting screw rod that can carry out length adjustment, the two ends of connecting screw rod are connected on the entrance of diffuser top exit 1 and wind-collecting cover 2, make the position of wind-collecting cover 2 and diffuser top exit 1 relative fixing.
Certainly, be subject to the impact of different blower fans, the link position of wind-collecting cover also can adjust accordingly.As shown in Figure 2, on centrifugal fan, the position of centrifugal wind-collecting cover 5 is just vertically mounted on the top of centrifugal fan diffuser top exit 6, and like this, the weary wind of vertically being discharged by outlet could effectively be collected, thereby has guaranteed effect and the reliability of collection wind.Equally, connection bracket also can be other structure, and its form is not limited in connecting screw rod, as long as can wind-collecting cover is relative fixing with the position of diffuser top exit.
As shown in Figure 1, in work, under the promotion of axial fan, diffuser top exit 1 is constantly discharged weary wind, is subject to inertia force influence, and weary wind can move forward after top exit 1 is discharged, because wind-collecting cover 2 is on the wind direction extended line at diffuser top exit 1, weary wind can enter into wind-collecting cover 2, and along with the transmission in duct set road 3, finally realizes the automatic collection of weary wind.Whole process, without consuming exterior power, weary wind only completes the process of being collected in the process of kinetic energy rejection, has both effectively reclaimed ventilation air gas, has avoided again energy consumption.
Claims (7)
1. the method for collecting ventilation air methane on top of diffuser of main fan of coal mine, is characterized in that, along the wind direction fixed set fan housing of coal mine main ventilator diffuser top exit, makes to keep between wind-collecting cover and diffuser top exit certain distance that is connected; The outlet of wind-collecting cover is communicated with duct set road, and the wind-collecting cover that utilizes the kinetic energy rejection of coal mine main ventilator diffuser top exit and have a smooth inner wall carries out ventilation air gas collection, and after the transmission of duct set road, realizes the continuous collection process of ventilation air gas;
The distance of described wind-collecting cover and diffuser top exit is 1-S rice, and the design formulas of S is:
Wherein, the flow of Q-jet main paragraph;
Q
0the flow of-jet initial segment;
R
0-diffuser outlet equivalent radius
Length and the width of A, the outlet of B-diffuser;
On S-jet axis, wind-collecting cover is apart from the axial distance of diffuser outlet;
α-turbulivity;
Get Q/Q
0≈ 1.
2. the method for collecting ventilation air methane on top of diffuser of main fan of coal mine according to claim 1, is characterized in that, the duct set road of described employing is front thick rear thin reducer pipe, and it is smooth smooth that reducer pipe inwall keeps.
3. the method for collecting ventilation air methane on top of diffuser of main fan of coal mine according to claim 1, is characterized in that, described wind-collecting cover inlet area is:
S
collection: S
expand=Q
collection: Q
expand
S
collection---the inlet area of wind-collecting cover;
S
expand---the discharge area of diffuser;
Q
collection---the collection air quantity of wind-collecting cover;
Q
expand---the exhaust air rate of diffuser outlet.
4. a device for the collecting ventilation air methane on top of diffuser of main fan of coal mine being used in conjunction with method described in claim 1, is characterized in that, comprise wind-collecting cover, duct set road and connection bracket, described duct set road is connected in the outlet of wind-collecting cover; Described wind-collecting cover is fixed on by connection bracket on the wind direction extended line of coal mine main ventilator diffuser top exit, and wind-collecting cover inner surface is smooth curve.
5. the device of collecting ventilation air methane on top of diffuser of main fan of coal mine according to claim 4, is characterized in that, described duct set road is reducer pipe, and the large end of reducer pipe is connected in the outlet of wind-collecting cover.
6. the device of collecting ventilation air methane on top of diffuser of main fan of coal mine according to claim 4, is characterized in that, described wind-collecting cover is corresponding to vertical direction or the oblique upper of diffuser top exit.
7. the device of collecting ventilation air methane on top of diffuser of main fan of coal mine according to claim 4, it is characterized in that, described connection bracket is the connecting screw rod of adjustable length, and the two ends of connecting screw rod are connected on the entrance of diffuser top exit and wind-collecting cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110234290.2A CN102392675B (en) | 2011-08-16 | 2011-08-16 | Method and device for collecting ventilation air methane on top of diffuser of main fan of coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110234290.2A CN102392675B (en) | 2011-08-16 | 2011-08-16 | Method and device for collecting ventilation air methane on top of diffuser of main fan of coal mine |
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| Publication Number | Publication Date |
|---|---|
| CN102392675A CN102392675A (en) | 2012-03-28 |
| CN102392675B true CN102392675B (en) | 2014-02-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102628370A (en) * | 2012-04-18 | 2012-08-08 | 丁汀 | Mobile natural ventilation and gas collecting device for underground mine |
| CN103016048B (en) * | 2012-12-21 | 2015-09-09 | 中煤科工集团重庆研究院有限公司 | A kind of zero resistance ventilation air gas collection method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381269A (en) * | 2008-10-14 | 2009-03-11 | 李若彬 | Methane recovery method in coal mine ventilation air methane |
| CN101955403A (en) * | 2010-04-27 | 2011-01-26 | 山东科技大学 | Technology and equipment for separating, enriching and recycling methane in mine return air stream |
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2011
- 2011-08-16 CN CN201110234290.2A patent/CN102392675B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381269A (en) * | 2008-10-14 | 2009-03-11 | 李若彬 | Methane recovery method in coal mine ventilation air methane |
| CN101955403A (en) * | 2010-04-27 | 2011-01-26 | 山东科技大学 | Technology and equipment for separating, enriching and recycling methane in mine return air stream |
Non-Patent Citations (2)
| Title |
|---|
| 二次实心旋转水气射流驱散积聚瓦斯的理论与试验;马中飞等;《煤炭学报》;20080229;第33卷(第2期);第141-142页第1.1至2节，图1 * |
| 马中飞等.二次实心旋转水气射流驱散积聚瓦斯的理论与试验.《煤炭学报》.2008,第33卷(第2期),第141-142页第1.1至2节，图1. |
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