CN206064211U - A kind of coal mine gas mixing device - Google Patents
A kind of coal mine gas mixing device Download PDFInfo
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- CN206064211U CN206064211U CN201621054200.6U CN201621054200U CN206064211U CN 206064211 U CN206064211 U CN 206064211U CN 201621054200 U CN201621054200 U CN 201621054200U CN 206064211 U CN206064211 U CN 206064211U
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- 238000002156 mixing Methods 0.000 title claims abstract description 127
- 239000003245 coal Substances 0.000 title claims abstract description 29
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 238000009423 ventilation Methods 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 238000009826 distribution Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 22
- 230000003647 oxidation Effects 0.000 abstract description 14
- 238000007254 oxidation reaction Methods 0.000 abstract description 14
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 8
- 238000000605 extraction Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 99
- 238000000034 method Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
This utility model provides a kind of coal mine gas mixing device, including inlet flange, blending air inlet pipe, ring pipe group, outlet(discharge) flange and pipeline body, the ventilating gas Jing inlet flanges of upstream ventilating gas pipeline enter pipeline body, mash gas extraction enters pipeline body by blending air inlet pipe and ring pipe, mash gas extraction is blended in pipeline body with ventilating gas, and the gas after blending enters downstream ventilating gas pipeline by outlet(discharge) flange.Coal mine gas mixing device simple structure of the present utility model, it is easy to processing and manufacturing, is easy to engineering site to assemble；Extra power need not be consumed；Blending speed is fast, and even blend degree is high, improve uniform blending speed, can significantly shorten blending distance, it is effectively guaranteed that the safety of the accuracy, the stability of oxidation unit and system of downstream methane concentration detection and flow detection.
Description
Technical Field
The utility model relates to a pneumatic mixing technical field especially relates to a colliery gas mixing device.
Background
The regenerative oxidation is an important technology with development prospect for processing coal mine ventilation gas with low methane concentration (less than 0.75%), difficult enrichment and large gas amount. In the actual operation of the heat accumulation oxidation device based on the heat accumulation oxidation technology, the methane concentration of the ventilation gas is too low (less than 0.3 percent) and the fluctuation is large, so that the stable operation of the oxidation device is not facilitated; meanwhile, considering the requirements of users (mining areas) on energy consumption such as cold, heat, electricity and the like, extracted gas with high methane concentration (about 8-30%) needs to be mixed in ventilation gas with extremely low concentration, so that on one hand, the concentration of the gas is ensured to be maintained at a stable value, and on the other hand, the heat released by methane oxidation is ensured to meet the requirements of users on energy consumption through recycling.
However, in the process of blending, the mixing is often influenced by factors such as site area, conditions and economy, the lengths of pipelines which are arranged in a way that mixed gas enters a flow monitoring point, a concentration monitoring point and an oxidation device and flows through are limited, uniform blending is difficult to realize, the accuracy of concentration on-line monitoring and flow measurement is influenced, the distribution of the calorific value of mixed gas is uneven, the layering phenomenon is caused, the stability of a temperature field of a heat storage oxidation device is influenced, and the concentration monitoring error is accompanied by potential safety hazard.
Direct pipeline cross blending is the simplest and common blending mode, and the blending mode is often applied to occasions with low requirements on gas concentration uniformity or occasions with long-distance transportation after blending. The injection mixing in the device for mixing coal mine gas by utilizing the Venturi ejector (CN201367915Y) is not suitable for mixing occasions with larger pipe diameters due to the entrainment effect of a high-speed jet gas. The mixing in the form of turbulence nets or baffles and the mixing of swirl vanes mentioned in the patent of a device for mixing coal mine gas by using a static mixer (CN201375883Y) and the patent of a swirl mixing device (CN105032225A) are methods capable of realizing better mixing uniformity and are suitable for occasions with higher requirements on mixing uniformity. Meanwhile, the structure is slightly complex, the mixing section is longer, certain influence is exerted on the spatial arrangement, and the pressure loss of the two mixing modes is relatively large; in a Ventilation Air Methane (VAM) oxidation device gas mixing and air intake system (CN201424957Y), compared with a baffle plate and rotational flow mixing mode, mixing in a mixing air pipe peripheral distribution mode has lower pressure loss and can also realize better mixing, but the structure is complicated and the assembly of an engineering field is complex.
The various mixing modes have the problems of complicated structure, complex equipment on an engineering site, long mixing distance, large pressure loss in the mixing process and the like in different degrees, and particularly have no engineering advantages of simple structure and simple and convenient installation in the large-pipe-diameter mixing application occasion of the ventilation gas.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
In order to solve the problems existing in the prior art, the utility model provides a coal mine gas mixing device.
(II) technical scheme
The utility model provides a colliery gas mixing device, include: the device comprises an inlet flange 1, a mixing air inlet pipe 2, an annular pipe group 3, an outlet flange 4 and a pipeline body 6; the inlet flange 1 and the outlet flange 4 are fixed at two ends of the pipeline body 6, and the pipeline body 6 is connected with a ventilation gas pipeline through the inlet flange 1 and the outlet flange 4; the annular pipe group 3 comprises at least one annular pipe positioned inside the pipeline body, and the mixing gas inlet pipe 2 penetrates through the pipe wall of the pipeline body and is communicated with the annular pipe; the ventilation gas of the upstream ventilation gas pipeline enters the pipeline body 6 through the inlet flange 1, the extracted gas enters the pipeline body 6 through the mixing air inlet pipe 2 and the annular pipe, the extracted gas and the ventilation gas are mixed in the pipeline body 6, and the mixed gas enters the downstream ventilation gas pipeline through the outlet flange 4.
Preferably, the annular tube group 3 comprises two annular tubes which are coaxially arranged with their central axes parallel to the axis of the pipe body.
Preferably, the two annular tubes are located at different axial positions and at a predetermined distance from each other,
preferably, the two annular tubes have different diameters and are located at the same axial position to form a concentric ring structure.
Preferably, the dilution air inlet pipe 2 comprises: the gas distribution section 21 and the branch sections with the same number as the annular pipes are arranged, the branch sections penetrate through the pipe wall of the pipeline body and are respectively communicated with the annular pipes, and extracted gas enters the annular pipes through the gas distribution section 21 and the branch sections.
Preferably, a group of gas injection holes 5 are formed in the pipe wall of the annular pipe, and extracted gas enters the pipeline body 6 through the gas injection holes 5 of the mixing gas inlet pipe 2 and the annular pipe.
Preferably, the gas injection holes 5 are swirl injection holes.
Preferably, the gas injection holes 5 are evenly distributed in the circumferential direction of the annular tube.
Preferably, the gas injection holes 5 are arranged alternately in the circumferential direction of the annular tube.
Preferably, the joint of the branch section and the pipe wall of the pipe body is fixed by welding or flanges.
(III) advantageous effects
According to the above technical scheme, the utility model discloses a colliery gas mixing device has following beneficial effect:
(1) the coal mine gas mixing device has simple structure, only two holes are needed to be arranged on the mixing device body for installing the mixing air inlet pipe, the manufacturing and processing procedures are simplified, the processing and the manufacturing are easy, the on-site assembly of the engineering is convenient, and the maintenance is free;
(2) the method mixes the ventilation gas and the extracted gas by means of the self pneumatic characteristics of the ventilation gas and the extracted gas, and does not need to consume external energy;
(3) the mixing speed is high, the mixing uniformity is high, the uniform mixing speed is improved, the mixing distance can be greatly shortened, and the accuracy of downstream methane concentration detection and flow detection, the stability of an oxidation device and the safety of a system are effectively ensured;
(4) the resistance loss of the ventilation gas pipeline in the mixing process is small, namely the pressure loss of the mixed pipeline is small, the mixing device is particularly suitable for mixing of gases with different concentrations under the condition of large pipe diameter in engineering, and the power consumption of a fan can be reduced.
Drawings
Fig. 1 is the embodiment of the utility model provides a coal mine gas blending device's schematic structure diagram.
[ notation ] to show
1-an inlet flange; 2-mixing an air inlet pipe; 3-a ring-shaped pipe group; 4-an outlet flange; 5-gas jet hole; 6-a pipe body; 21-a gas distribution section; 22-a first branch section; 23-a second branch section; 31-a first annular tube; 32-second annular tube.
Detailed Description
An object of the utility model is to provide a colliery gas mixing device, it can be with taking out and adopt the gas and mix in the ventilation gas to can realize concentration evenly distributed fast. The device realizes mixing by means of the pneumatic characteristics of the two gases, and does not consume external energy. By means of reasonable arrangement and structure of the annular pipe group and the mixing swirl holes, the main ventilation gas pipeline in the mixing process is small in resistance loss, high in mixing speed and even, the mixing distance can be greatly shortened, and accuracy of downstream methane concentration detection and flow detection, stability of an oxidation device and safety of a system are guaranteed. The device simple structure, the function is practical, easily manufacturing, non-maintaining is particularly useful for taking out before the thermal storage oxidation unit and takes out the mixing of gas and ventilation gas.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
In an embodiment of the present invention, as shown in fig. 1, there is provided a coal mine gas blending device, which includes an inlet flange 1, a blending gas inlet pipe 2, an annular pipe group 3, an outlet flange 4 and a pipeline body 6; wherein,
the inlet flange 1 and the outlet flange 4 are fixed at two ends of the pipeline body 6, the pipeline body 6 is connected with a ventilation gas pipeline through the inlet flange 1 and the outlet flange 4, and ventilation gas in the upstream ventilation gas pipeline enters the pipeline body 6 through the inlet flange 1;
the blend intake pipe 2 includes: a gas distribution section 21 and two branch sections, i.e., a first branch section 22 and a second branch section 23, the annular tube group 3 including: the gas injection pipeline comprises a first annular pipe 31 and a second annular pipe 32 which are coaxially arranged, wherein the first annular pipe 31 and the second annular pipe 32 are positioned inside a pipeline body 6, the central axis of the first annular pipe 31 and the central axis of the second annular pipe 32 are parallel to the axis of the pipeline body 6, the first annular pipe 31 and the second annular pipe 32 are positioned at different axial positions and are separated by a preset distance, a first branch section 22 and a second branch section 23 penetrate through the pipe wall of the pipeline body 6 and are respectively communicated with the first annular pipe 31 and the second annular pipe 32, and a group of gas injection holes 5 are respectively formed in the pipe walls of the first annular pipe. Wherein, the joints of the first branch section 22 and the second branch section 23 and the pipe wall of the pipeline body 6 are fixed by welding or flanges.
The utility model discloses coal mine gas mixing device, ventilation gas in the upper reaches ventilation gas pipeline gets into pipeline body 6 through entry flange 1, takes out and adopts gas and get into annular nest of tubes 3 through mixing intake pipe 2 to by gas jet orifice 5 blowout on first ring pipe 31 and the second ring pipe 32, with the ventilation gas mixing in pipeline body 6, gas after the mixing gets into low reaches ventilation gas pipeline by outlet flange 4.
Therefore, compared with the prior art, the coal mine gas mixing device provided by the embodiment of the utility model has a simple structure, only two holes are needed to be arranged on the pipeline body for installing the mixing air inlet pipe, the manufacturing and processing procedures are simplified, the processing and the manufacturing are easy, the on-site assembly of the project is convenient, and the maintenance is free; and the self pneumatic characteristics of ventilation gas and extracted gas are mixed, and external energy is not consumed.
As shown in Table 1, for under the same condition, the coal mine gas blending device and the blending device of the prior art six air inlet pipe circumferential arrangement structure compare the results of the blending of methane and air. Taking the section of the downstream pipeline at a position 5 meters away from the blending starting point as an example, the blending unevenness of the blending device with the circumferential arrangement structure is 0.62, and the blending unevenness of the coal mine gas blending device of the utility model is 0.18; and when using the utility model discloses colliery gas mixing device, the mixing unevenness of low reaches pipeline only is 1.3 meters apart from the distance of mixing the starting point 0.62's cross-section, compares in circumference arrangement structure's mixing device, and the mixing distance has shortened 3.7 meters.
TABLE 1
Therefore, the coal mine gas blending device provided by the embodiment of the utility model has the advantages of high blending speed and high blending uniformity, improves the uniform blending speed, can greatly shorten the blending distance, and effectively ensures the accuracy of downstream methane concentration detection and flow detection, the stability of an oxidation device and the safety of a system; the mixing distance is shortened, so that the space is saved, and the accuracy of the downstream detection and the stability and the safety of the device are facilitated; the resistance loss of the ventilation gas pipeline in the blending process is small, namely the pressure loss of the blended pipeline is small, and the blending method is particularly suitable for blending under the large-pipe-diameter conditions of gas with different concentrations in engineering.
The utility model discloses in the colliery gas blending device of embodiment, gas jet hole evenly distributed on the circumferencial direction of ring pipe, to gas jet hole's figure and diameter the utility model discloses not prescribing a limit to, it can select according to engineering actual conditions to reach required mixing effect. Preferably, the gas injection holes 5 are swirl injection holes, namely, the extension direction of the gas injection holes and the radial direction of the annular pipe form a predetermined angle to form swirl injection holes, and the swirl injection holes can increase swirl entrainment during gas extraction injection, so that the mixing effect is further enhanced. Preferably, the gas injection holes of the first and second annular pipes are arranged staggered in the circumferential direction, i.e., on a cross section perpendicular to the central axes of the first and second annular pipes, the projection of the first annular pipe gas injection holes on the cross section is arranged alternately with the projection of the second annular pipe gas injection holes on the cross section, for example, in the first annular pipe gas injection holes, if two of the gas injection holes are located at 12 o 'clock and 2 o' clock, two of the second annular pipe gas injection holes are located at 1 o 'clock and 3 o' clock, and so on.
Although in the embodiment of the present invention, the annular pipe group 3 has two annular pipes and the mixing intake pipe 2 has two branch sections, the present invention is not limited thereto. The annular pipe group 3 can comprise one or more annular pipes, the diameter of the annular pipe, the diameter of the pipe cavity and the preset distance between the annular pipes can be set according to the practical engineering situation, and can be the same or different, and when the diameters of the annular pipes are different, the annular pipes can be positioned at different axial positions or the same axial position to form a concentric ring structure; correspondingly, the mixing air inlet pipe 2 is also provided with a plurality of branch sections corresponding to the number of the annular pipes, and each branch section is communicated with one annular pipe so as to realize more uniform and faster mixing in the pipeline.
Up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should clearly understand that the coal mine gas blending device of the present invention is provided.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. In addition, the above definitions of the various elements are not limited to the specific structures, shapes or modes mentioned in the embodiments, and those skilled in the art may easily modify or replace them, for example:
(1) directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the orientation of the drawings and are not intended to limit the scope of the present invention;
(2) the embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e. technical features in different embodiments may be freely combined to form further embodiments.
To sum up, the utility model provides a coal mine gas mixing device, compared with the prior art, the structure is simple, only two holes are needed to be arranged on the pipeline body for installing the mixing air inlet pipe, the manufacturing and processing procedures are simplified, the processing and the manufacturing are easy, the on-site assembly of the project is convenient, and the maintenance is free; the air-powered coal mine gas is blended by the self pneumatic characteristics of ventilation gas and extracted gas, and external energy is not consumed; the mixing speed is high, the mixing uniformity is high, the uniform mixing speed is improved, the mixing distance can be greatly shortened, and the accuracy of downstream methane concentration detection and flow detection, the stability of an oxidation device and the safety of a system are effectively ensured; the mixing distance is shortened, so that the space is saved, and the accuracy of the downstream detection and the stability and the safety of the device are facilitated; the resistance loss of the ventilation gas pipeline in the blending process is small, namely the pressure loss of the blended pipeline is small, and the blending method is particularly suitable for blending under the large-pipe-diameter conditions of gas with different concentrations in engineering.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A coal mine gas blending device is characterized by comprising: the device comprises an inlet flange (1), a mixing air inlet pipe (2), an annular pipe group (3), an outlet flange (4) and a pipeline body (6); wherein,
the inlet flange (1) and the outlet flange (4) are fixed at two ends of the pipeline body (6), and the pipeline body (6) is connected with a ventilation gas pipeline through the inlet flange (1) and the outlet flange (4);
the annular pipe group (3) comprises at least one annular pipe positioned in the pipeline body, and the mixing air inlet pipe (2) penetrates through the pipe wall of the pipeline body and is communicated with the annular pipe;
the ventilation gas of the upstream ventilation gas pipeline enters the pipeline body (6) through the inlet flange (1), the extracted gas enters the pipeline body (6) through the mixing air inlet pipe (2) and the annular pipe, the extracted gas and the ventilation gas are mixed in the pipeline body (6), and the mixed gas enters the downstream ventilation gas pipeline through the outlet flange (4).
2. The coal mine gas blending device according to claim 1, wherein the annular tube set (3) comprises two annular tubes arranged coaxially with their central axes parallel to the axis of the pipe body.
3. The coal mine gas blending device of claim 2, wherein the two annular pipes are located at different axial positions and at a predetermined distance apart.
4. The coal mine gas blending device of claim 2, wherein the two annular pipes have different diameters and are located at the same axial position to form a concentric ring configuration.
5. A coal mine gas blending device according to claim 1, wherein the blending gas inlet pipe (2) comprises: the gas distribution pipeline comprises a gas distribution section (21) and branch sections with the same number as the annular pipes, wherein the branch sections penetrate through the pipe wall of the pipeline body and are respectively communicated with the annular pipes, and extracted gas enters the annular pipes through the gas distribution section (21) and the branch sections.
6. The coal mine gas blending device according to claim 1, wherein the wall of the annular pipe is provided with a group of gas injection holes (5), and extracted gas enters the pipeline body (6) through the blending gas inlet pipe (2) and the gas injection holes (5) of the annular pipe.
7. The coal mine gas blending device according to claim 6, wherein the gas injection holes (5) are swirl injection holes.
8. Coal mine gas blending device according to claim 6, wherein the gas injection holes (5) are evenly distributed in the circumferential direction of the annular tube.
9. Coal mine gas blending device according to claim 8, wherein the gas injection holes (5) are staggered in the circumferential direction of the annular pipe.
10. The coal mine gas blending device of claim 5, wherein the junction of the branch section and the pipe wall of the pipe body is fixed by welding or flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054200.6U CN206064211U (en) | 2016-09-13 | 2016-09-13 | A kind of coal mine gas mixing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054200.6U CN206064211U (en) | 2016-09-13 | 2016-09-13 | A kind of coal mine gas mixing device |
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| CN206064211U true CN206064211U (en) | 2017-04-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106237880A (en) * | 2016-09-13 | 2016-12-21 | 中国科学院工程热物理研究所 | A kind of coal mine gas mixing device |
| CN108916654A (en) * | 2018-07-13 | 2018-11-30 | 平安开诚智能安全装备有限责任公司 | A kind of safe mixing device of ultralow concentration gas and method |
| CN114225732A (en) * | 2021-12-22 | 2022-03-25 | 哈尔滨名诺环保科技有限公司 | Air-gas static mixer with resistance reduction and efficiency improvement functions |
-
2016
- 2016-09-13 CN CN201621054200.6U patent/CN206064211U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106237880A (en) * | 2016-09-13 | 2016-12-21 | 中国科学院工程热物理研究所 | A kind of coal mine gas mixing device |
| CN108916654A (en) * | 2018-07-13 | 2018-11-30 | 平安开诚智能安全装备有限责任公司 | A kind of safe mixing device of ultralow concentration gas and method |
| CN114225732A (en) * | 2021-12-22 | 2022-03-25 | 哈尔滨名诺环保科技有限公司 | Air-gas static mixer with resistance reduction and efficiency improvement functions |
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