CN111238583A - A method for detecting the flow rate of low-velocity gas extraction pipeline by using mixed air - Google Patents

A method for detecting the flow rate of low-velocity gas extraction pipeline by using mixed air Download PDF

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CN111238583A
CN111238583A CN201811441027.9A CN201811441027A CN111238583A CN 111238583 A CN111238583 A CN 111238583A CN 201811441027 A CN201811441027 A CN 201811441027A CN 111238583 A CN111238583 A CN 111238583A
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nozzle
air
gas
flow
extraction pipeline
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孙健
高彦立
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Hebei Jinguang Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/42—Orifices or nozzles

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Abstract

A method for detecting low-flow-rate gas extraction pipeline flow by adopting mixed air relates to the technical field of coal mine gas extraction. The gas nozzle comprises a main body, a nozzle, a gas cap, a nozzle joint sealing cover, a connecting piece, a flange, a second gas nozzle, a first gas nozzle, a nozzle joint and a third gas nozzle, wherein the flanges are arranged at the gas inlet end and the gas outlet end of the main body, and the second gas nozzle, the first gas nozzle, the nozzle joint and the third gas nozzle are sequentially arranged on the main body from the gas inlet end to the gas outlet end; the diameter of the main body is equal to that of the extraction pipeline, and the air inlet end and the air outlet end of the main body are connected with the extraction pipeline through flanges. After the technical scheme is adopted, the invention has the beneficial effects that: the detection device is high in measurement precision and good in accuracy, realizes accurate measurement of low-flow-rate gas extraction pipeline flow, can be used for detecting tail end flow of extraction systems such as drilling holes and drill sites, is beneficial to accurate measurement of gas extraction quantity, improves accuracy of standard judgment of gas extraction, and has important significance for gas prevention and control of coal mines.

Description

一种采用掺混空气检测低流速瓦斯抽采管路流量的方法A method for detecting the flow rate of low-velocity gas extraction pipeline by using mixed air

技术领域technical field

本发明涉及煤矿瓦斯抽采技术领域，具体涉及一种采用掺混空气检测低流速瓦斯抽采管路流量的方法。The invention relates to the technical field of gas extraction in coal mines, in particular to a method for detecting the flow rate of a gas extraction pipeline with low flow velocity by using mixed air.

背景技术Background technique

瓦斯抽采是我国煤矿最重要的瓦斯防治措施之一。准确测定负压、浓度、流量、温度、湿度等瓦斯抽采管路参数，对于瓦斯抽采量的精准计量，抽采达标准确评判，保障煤矿安全等具有重要意义。经过多年发展，目前煤矿现场的仪器设备已经实现了对负压、浓度、温度、湿度等参数较为精准的测量，但是流量参数的检测却没有得到有效解决，仍然存在很大的问题。现阶段，煤矿井下瓦斯抽采管路流量检测主要采用孔板流量计、皮托管流量计、V锥流量计、涡街流量计等方法，普遍存在低流速条件下测量精度低、准确性差的问题，不能满足煤矿现场钻孔、钻场等小流量环境的瓦斯抽采流量计量的需要。因此，低流速瓦斯抽采管路流量参数的测量，一直是煤矿瓦斯抽采参数检测、计量方面的技术难题之一。Gas drainage is one of the most important gas control measures in my country's coal mines. Accurate measurement of gas extraction pipeline parameters such as negative pressure, concentration, flow rate, temperature, and humidity is of great significance for accurate measurement of gas extraction volume, accurate assessment of gas extraction standards, and protection of coal mine safety. After years of development, the instruments and equipment on the coal mine site have achieved relatively accurate measurement of parameters such as negative pressure, concentration, temperature, and humidity, but the detection of flow parameters has not been effectively solved, and there are still big problems. At present, the flow detection of underground gas drainage pipelines in coal mines mainly adopts orifice flowmeters, pitot tube flowmeters, V-cone flowmeters, vortex flowmeters and other methods. There are generally problems of low measurement accuracy and poor accuracy under low flow rate conditions. , it cannot meet the needs of gas drainage flow measurement in small-flow environments such as on-site drilling and drilling sites in coal mines. Therefore, the measurement of flow parameters of low-flow gas extraction pipelines has always been one of the technical difficulties in the detection and measurement of gas extraction parameters in coal mines.

发明内容SUMMARY OF THE INVENTION

本发明的目的在于针对现有技术的缺陷和不足，提供一种采用掺混空气检测低流速瓦斯抽采管路流量的方法，通过向抽采管路中掺混一定量的空气，并检测掺混空气前后瓦斯浓度变化，实现低流速瓦斯抽采管路瓦斯流量的准确测量，对于煤矿瓦斯防治具有重要意义。The purpose of the present invention is to aim at the defects and deficiencies of the prior art, and to provide a method for detecting the flow rate of a low-velocity gas extraction pipeline by using mixed air. The change of gas concentration before and after mixing with air to achieve accurate measurement of gas flow in low-velocity gas extraction pipelines is of great significance for coal mine gas prevention and control.

为实现上述目的，本发明采用以下技术方案是：To achieve the above object, the present invention adopts the following technical solutions:

掺混空气检测低流速瓦斯抽采管路流量的测定装置，它包含主体1、喷嘴2、气帽3、喷嘴接头密封盖4、连接件5、法兰11、第二气嘴12、第一气嘴13、喷嘴接头14、第三气嘴15，所述主体1进气端、出气端均设置有法兰11，主体1自进气端向出气端依次设置有第二气嘴12、第一气嘴13、喷嘴接头14、第三气嘴15；A measuring device for detecting the flow rate of gas extraction pipelines with low flow rate by mixing air, it includes a main body 1, a nozzle 2, a gas cap 3, a nozzle joint sealing cover 4, a connecting piece 5, a flange 11, a second gas nozzle 12, a first The air nozzle 13, the nozzle joint 14, the third air nozzle 15, the main body 1 is provided with a flange 11 at the air inlet end and the air outlet end, and the main body 1 is sequentially provided with a second air nozzle 12, a second air nozzle 12 from the air inlet end to the air outlet end. A gas nozzle 13, a nozzle joint 14, a third gas nozzle 15;

所述主体1的直径等于抽采管路的直径，且主体1进气端、出气端均与抽采管路通过法兰11连接；The diameter of the main body 1 is equal to the diameter of the extraction pipeline, and the inlet end and the gas outlet end of the main body 1 are connected to the extraction pipeline through the flange 11;

所述第二气嘴12、第三气嘴15上均设置有气帽3；The second air nozzle 12 and the third air nozzle 15 are provided with air caps 3;

所述第一气嘴13与气压计连接；The first air nozzle 13 is connected with the barometer;

所述喷嘴接头14上设置有连接件5，连接件5包含喷嘴2或喷嘴接头密封盖4中的一种。The nozzle joint 14 is provided with a connecting piece 5 , and the connecting piece 5 includes one of the nozzle 2 or the nozzle joint sealing cover 4 .

所述喷嘴接头14与第一气嘴13间距不小于2倍的主体1内径，喷嘴接头14与第三气嘴15间距不小于4倍的主体1内径。The distance between the nozzle joint 14 and the first air nozzle 13 is not less than 2 times the inner diameter of the main body 1 , and the distance between the nozzle joint 14 and the third air nozzle 15 is not less than 4 times the inner diameter of the main body 1 .

所述喷嘴2为系列标准件。The nozzle 2 is a series of standard parts.

所述喷嘴接头14内壁设置有内螺纹。The inner wall of the nozzle joint 14 is provided with internal threads.

所述喷嘴2的外形结构为六棱柱与圆柱的组合形式，喷嘴2上部为短六棱柱，喷嘴2下部为圆柱，短六棱柱、圆柱二者同轴，中间为喷孔，圆柱外侧设置有螺纹。The shape structure of the nozzle 2 is a combination of a hexagonal prism and a cylinder, the upper part of the nozzle 2 is a short hexagonal prism, the lower part of the nozzle 2 is a cylinder, the short hexagonal prism and the cylinder are coaxial, the middle is a nozzle hole, and the outer side of the cylinder is provided with a thread. .

所述气帽3为橡胶帽。The air cap 3 is a rubber cap.

所述喷嘴接头密封盖4外形与喷嘴2相同，喷嘴接头密封盖4中间没有喷孔，且喷嘴接头密封盖4为实心结构、圆柱外侧设置有螺纹。The shape of the nozzle joint sealing cover 4 is the same as that of the nozzle 2, there is no spray hole in the middle of the nozzle joint sealing cover 4, and the nozzle joint sealing cover 4 is a solid structure with threads provided on the outer side of the cylinder.

掺混空气检测低流速瓦斯抽采管路流量的测定方法，它包含如下步骤：The method for measuring the flow rate of gas extraction pipelines with low flow velocity with mixed air includes the following steps:

步骤S1：在被测瓦斯抽采管路中安装掺混空气检测低流速瓦斯抽采管路流量的测定装置；Step S1: install a measuring device for mixing air in the gas extraction pipeline under test to detect the flow rate of the gas extraction pipeline with low flow velocity;

步骤S2：测定瓦斯抽采管路所处环境空气中的瓦斯浓度

Figure DEST_PATH_IMAGE001
；Step S2: Measure the gas concentration in the ambient air where the gas extraction pipeline is located
Figure DEST_PATH_IMAGE001
;

步骤S3：将气压计与掺混空气检测低流速瓦斯抽采管路流量的测定装置的第一气嘴13连接，测定瓦斯抽采管路的工况负压

Figure 625710DEST_PATH_IMAGE002
；Step S3: Connect the barometer to the first gas nozzle 13 of the measuring device for detecting the flow rate of the gas extraction pipeline with low flow rate of mixed air, and measure the working condition negative pressure of the gas extraction pipeline
Figure 625710DEST_PATH_IMAGE002
;

步骤S4：选择合适型号的喷嘴2安装于掺混空气检测低流速瓦斯抽采管路流量的测定装置的喷嘴接头14上，向管路中喷射空气，并计算获得负压

Figure DEST_PATH_IMAGE003
下喷嘴2的喷射流量
Figure 832963DEST_PATH_IMAGE004
，计算公式如下：Step S4: Select an appropriate type of nozzle 2 and install it on the nozzle joint 14 of the measuring device for measuring the flow rate of the gas extraction pipeline with low flow rate of mixed air, spray air into the pipeline, and calculate the negative pressure
Figure DEST_PATH_IMAGE003
The jet flow rate of the lower nozzle 2
Figure 832963DEST_PATH_IMAGE004
,Calculated as follows:

Figure 230446DEST_PATH_IMAGE005
Figure 230446DEST_PATH_IMAGE005

其中：

Figure 21685DEST_PATH_IMAGE006
为喷嘴2的流量系数，确定喷嘴2型号后
Figure 100499DEST_PATH_IMAGE007
为固定值；in:
Figure 21685DEST_PATH_IMAGE006
is the flow coefficient of nozzle 2, after determining the model of nozzle 2
Figure 100499DEST_PATH_IMAGE007
is a fixed value;

步骤S5：通过掺混空气检测低流速瓦斯抽采管路流量的测定装置的第二气嘴12采集瓦斯抽采管路中气体的气样，测定上游管路中未掺混空气的管道气体的瓦斯浓度

Figure 660794DEST_PATH_IMAGE008
；Step S5: Collect a gas sample of the gas in the gas extraction pipeline through the second gas nozzle 12 of the measuring device for detecting the flow rate of the low-velocity gas extraction pipeline by mixing air, and measure the gas concentration of the pipeline gas in the upstream pipeline that is not mixed with air. Gas concentration
Figure 660794DEST_PATH_IMAGE008
;

步骤S6：通过掺混空气检测低流速瓦斯抽采管路流量的测定装置的第三气嘴15采集气样，测定下游管路中掺混空气后的管路气体的瓦斯浓度

Figure 432441DEST_PATH_IMAGE009
；Step S6: Collect gas samples through the third gas nozzle 15 of the measuring device for detecting the flow rate of the low-velocity gas extraction pipeline by mixing air, and measure the gas concentration of the pipeline gas after mixing air in the downstream pipeline
Figure 432441DEST_PATH_IMAGE009
;

步骤S7：计算获得工况下瓦斯抽采管路中气体的混合流量

Figure 949791DEST_PATH_IMAGE010
：Step S7: Calculate and obtain the mixed flow of gas in the gas extraction pipeline under working conditions
Figure 949791DEST_PATH_IMAGE010
:

Figure 894613DEST_PATH_IMAGE011
。
Figure 894613DEST_PATH_IMAGE011
.

所述喷嘴2型号的选择是否合适，其判定方法为：喷嘴2对管路上游抽采负压

Figure 247097DEST_PATH_IMAGE012
的影响在±10%以内，认为喷嘴2型号合适，否则认为不合适。Whether the selection of the nozzle 2 model is appropriate is determined as follows: the nozzle 2 draws negative pressure on the upstream of the pipeline
Figure 247097DEST_PATH_IMAGE012
If the influence is within ±10%, it is considered that the nozzle 2 model is suitable, otherwise it is considered inappropriate.

本发明的工作原理：主体1进气端、出气端均设置有法兰11，主体1自进气端向出气端依次设置有第二气嘴12、第一气嘴13、喷嘴接头14、第三气嘴15；所述主体1的直径等于抽采管路的直径，且主体1进气端、出气端均与抽采管路通过法兰11连接；所述第二气嘴12、第三气嘴15上均设置有气帽3；第二气嘴12用于采集上游未掺混空气的抽采管路气样，测定未掺混空气的管路瓦斯浓度，第三气嘴15用于采集下游掺混空气后的抽采管路气样，测定掺混空气后管路瓦斯浓度，第二气嘴12、第三气嘴15上均设置有气帽3，在非瓦斯抽采管路流量测定期间封堵第二气嘴12、第三气嘴15；所述第一气嘴13与气压计连接；第一气嘴13与气压计连接测定管路抽采负压；所述喷嘴接头14上设置有连接件5，连接件5包含喷嘴2或喷嘴接头密封盖4中的一种。在瓦斯抽采管路流量测定过程中，喷嘴接头14上设置有喷嘴2，向主体1内部喷射空气，在主体1空间内实现空气与抽采管路瓦斯气体的掺混；在非瓦斯抽采管路流量测定期间，喷嘴接头14上设置有喷嘴接头密封盖4封堵喷嘴接头14，空气入口安装喷嘴2，提高了空气的掺混效率，缩短了掺混距离，确保了空气与管道气体的充分混合，保证了检测结果的准确性；喷嘴2采用系列标准件，根据喷嘴2的负压-流量关系快速计算获得掺混的空气流量，充分考虑了煤矿井下瓦斯抽采的复杂性和多变性，确保了该方法的便捷性和广泛适应性，能够用于不同条件下的低流速瓦斯抽采管路流量的准确测定。The working principle of the present invention: the main body 1 is provided with flanges 11 at the air inlet end and the air outlet end, and the main body 1 is sequentially provided with a second air nozzle 12, a first air nozzle 13, a nozzle joint 14, and a second air nozzle 12 from the air inlet end to the air outlet end. Three gas nozzles 15; the diameter of the main body 1 is equal to the diameter of the extraction pipeline, and the inlet and outlet ends of the main body 1 are connected with the extraction pipeline through the flange 11; the second gas nozzle 12, the third gas nozzle The gas nozzles 15 are all provided with gas caps 3; the second gas nozzle 12 is used to collect the gas sample of the upstream unmixed air extraction pipeline to measure the gas concentration of the unmixed pipeline pipeline, and the third gas nozzle 15 is used to Collect the gas sample of the extraction pipeline after mixing with air downstream, and measure the gas concentration of the pipeline after mixing with air. The second gas nozzle 12 and the third gas nozzle 15 are both provided with gas caps 3. In the non-gas extraction pipeline During the flow measurement, the second gas nozzle 12 and the third gas nozzle 15 are blocked; the first gas nozzle 13 is connected with the barometer; the first gas nozzle 13 is connected with the barometer to measure the negative pressure of the pipeline; the nozzle joint 14 is provided with a connecting piece 5, and the connecting piece 5 includes one of the nozzle 2 or the nozzle joint sealing cover 4. In the process of measuring the flow rate of the gas extraction pipeline, the nozzle joint 14 is provided with a nozzle 2, which sprays air into the main body 1, and realizes the mixing of the air and the gas in the gas extraction pipeline in the space of the main body 1; During the flow measurement of the pipeline, the nozzle joint 14 is provided with a nozzle joint sealing cover 4 to block the nozzle joint 14, and the air inlet is installed with the nozzle 2, which improves the air mixing efficiency, shortens the mixing distance, and ensures the air and pipeline gas. Fully mixed to ensure the accuracy of the test results; Nozzle 2 adopts a series of standard parts, according to the negative pressure-flow relationship of nozzle 2 to quickly calculate and obtain the mixed air flow, fully considering the complexity and variability of underground gas extraction in coal mines , which ensures the convenience and wide adaptability of the method, and can be used for the accurate determination of the flow rate of the gas extraction pipeline with low flow velocity under different conditions.

采用上述技术方案后，本发明有益效果为：检测装置测量精度高、准确性好，通过向瓦斯抽采管道掺混一定量的空气，测定掺混空气前后瓦斯抽采管路中瓦斯浓度的变化情况，实现了低流速瓦斯抽采管路流量的准确测量，能够用于钻孔、钻场等抽采系统末端流量检测，有助于瓦斯抽采量的精准计量，提高瓦斯抽采达标评判的准确性，对于煤矿瓦斯防治具有重要意义。After the above technical scheme is adopted, the beneficial effects of the present invention are: the detection device has high measurement precision and good accuracy, and by mixing a certain amount of air into the gas extraction pipeline, the change of the gas concentration in the gas extraction pipeline before and after mixing with air is measured. It realizes the accurate measurement of the flow rate of the gas drainage pipeline at low flow rate, and can be used for the flow detection at the end of the drainage system such as drilling holes and drilling sites, which is helpful for the accurate measurement of the gas drainage amount and improves the evaluation of gas drainage compliance. Accuracy is of great significance for coal mine gas prevention and control.

提高了空气的掺混效率，缩短了掺混距离，确保了空气与管道气体的充分混合，保证了检测结果的准确性；充分考虑了煤矿井下瓦斯抽采的复杂性和多变性，确保了该方法的便捷性和广泛适应性，能够用于不同条件下的低流速瓦斯抽采管路流量的准确测定。The air mixing efficiency is improved, the mixing distance is shortened, the air and the pipeline gas are fully mixed, and the accuracy of the detection results is ensured; The convenience and wide adaptability of the method can be used to accurately measure the flow rate of gas drainage pipelines with low flow velocity under different conditions.

附图说明Description of drawings

为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

图1是本发明的结构示意图；Fig. 1 is the structural representation of the present invention;

图2是本发明中喷嘴2的结构示意图；Fig. 2 is the structural representation of nozzle 2 in the present invention;

图3是对应图2的俯视图；Fig. 3 is the top view corresponding to Fig. 2;

图4是本发明中气帽3的结构示意图；Fig. 4 is the structural representation of gas cap 3 in the present invention;

图5是对应图4的俯视图；Fig. 5 is the top view corresponding to Fig. 4;

图6是本发明中喷嘴接头密封盖4的结构示意图；6 is a schematic structural diagram of the nozzle joint sealing cover 4 in the present invention;

图7是对应图6的俯视图；Fig. 7 is the top view corresponding to Fig. 6;

图8是本发明中连接件5的结构示意图；Fig. 8 is the structural representation of the connector 5 in the present invention;

图9是本发明的步骤示意框图。FIG. 9 is a schematic block diagram of the steps of the present invention.

附图标记说明：主体1、喷嘴2、气帽3、喷嘴接头密封盖4、连接件5、法兰11、第二气嘴12、第一气嘴13、喷嘴接头14、第三气嘴15。Description of reference numerals: main body 1, nozzle 2, gas cap 3, nozzle joint sealing cover 4, connecting piece 5, flange 11, second gas nozzle 12, first gas nozzle 13, nozzle joint 14, third gas nozzle 15 .

具体实施方式Detailed ways

参看图1-图9所示，本具体实施方式采用的技术方案是：1-9, the technical solution adopted in this specific embodiment is:

掺混空气检测低流速瓦斯抽采管路流量的测定装置，它包含主体1、喷嘴2、气帽3、喷嘴接头密封盖4、连接件5、法兰11、第二气嘴12、第一气嘴13、喷嘴接头14、第三气嘴15，所述主体1进气端、出气端均设置有法兰11，主体1自进气端向出气端依次设置有第二气嘴12、第一气嘴13、喷嘴接头14、第三气嘴15；A measuring device for detecting the flow rate of gas extraction pipelines with low flow rate by mixing air, it includes a main body 1, a nozzle 2, a gas cap 3, a nozzle joint sealing cover 4, a connecting piece 5, a flange 11, a second gas nozzle 12, a first The air nozzle 13, the nozzle joint 14, the third air nozzle 15, the main body 1 is provided with a flange 11 at the air inlet end and the air outlet end, and the main body 1 is sequentially provided with a second air nozzle 12, a second air nozzle 12 from the air inlet end to the air outlet end. A gas nozzle 13, a nozzle joint 14, a third gas nozzle 15;

所述主体1的直径等于抽采管路的直径，且主体1进气端、出气端均与抽采管路通过法兰11连接；The diameter of the main body 1 is equal to the diameter of the extraction pipeline, and the inlet end and the gas outlet end of the main body 1 are connected to the extraction pipeline through the flange 11;

所述第二气嘴12、第三气嘴15上均设置有气帽3；第二气嘴12用于采集上游未掺混空气的抽采管路气样，测定未掺混空气的管路瓦斯浓度，第三气嘴15用于采集下游掺混空气后的抽采管路气样，测定掺混空气后管路瓦斯浓度，第二气嘴12、第三气嘴15上均设置有气帽3，在非瓦斯抽采管路流量测定期间封堵第二气嘴12、第三气嘴15；The second air nozzle 12 and the third air nozzle 15 are both provided with air caps 3; the second air nozzle 12 is used to collect the gas sample of the upstream unmixed air sampling pipeline, and measure the unmixed air pipeline Gas concentration, the third gas nozzle 15 is used to collect the gas sample of the extraction pipeline after the downstream air is mixed, and measure the gas concentration of the pipeline after the air is mixed. The second gas nozzle 12 and the third gas nozzle 15 are provided with gas Cap 3, block the second gas nozzle 12 and the third gas nozzle 15 during the flow measurement of the non-gas extraction pipeline;

所述第一气嘴13与气压计连接；第一气嘴13与气压计连接测定管路抽采负压；The first air nozzle 13 is connected with the barometer; the first air nozzle 13 is connected with the barometer to measure the negative pressure of pipeline extraction;

所述喷嘴接头14上设置有连接件5，连接件5包含喷嘴2或喷嘴接头密封盖4中的一种。在瓦斯抽采管路流量测定过程中，喷嘴接头14上设置有喷嘴2，向主体1内部喷射空气，在主体1空间内实现空气与抽采管路瓦斯气体的掺混；在非瓦斯抽采管路流量测定期间，喷嘴接头14上设置有喷嘴接头密封盖4封堵喷嘴接头14。The nozzle joint 14 is provided with a connecting piece 5 , and the connecting piece 5 includes one of the nozzle 2 or the nozzle joint sealing cover 4 . In the process of measuring the flow rate of the gas extraction pipeline, the nozzle joint 14 is provided with a nozzle 2, which sprays air into the main body 1, and realizes the mixing of the air and the gas in the gas extraction pipeline in the space of the main body 1; During the pipeline flow measurement, the nozzle joint 14 is provided with a nozzle joint sealing cover 4 to block the nozzle joint 14 .

所述喷嘴接头14与第一气嘴13间距不小于2倍的主体1内径，喷嘴接头14与第三气嘴15间距不小于4倍的主体1内径。The distance between the nozzle joint 14 and the first air nozzle 13 is not less than 2 times the inner diameter of the main body 1 , and the distance between the nozzle joint 14 and the third air nozzle 15 is not less than 4 times the inner diameter of the main body 1 .

所述喷嘴2为系列标准件。喷嘴2按照结构不同分为多个系列，每个系列按照喷嘴2直径和喷孔大小不同包含多个型号，每个型号喷嘴2的流量系数μ在实验室检测获得。The nozzle 2 is a series of standard parts. The nozzles 2 are divided into multiple series according to different structures, and each series includes multiple models according to the diameter of the nozzle 2 and the size of the nozzle hole. The flow coefficient μ of the nozzle 2 of each model is obtained by testing in the laboratory.

所述喷嘴接头14内壁设置有内螺纹。The inner wall of the nozzle joint 14 is provided with internal threads.

所述喷嘴2的外形结构为六棱柱与圆柱的组合形式，喷嘴2上部为短六棱柱，喷嘴2下部为圆柱，短六棱柱、圆柱二者同轴，中间为喷孔，圆柱外侧设置有螺纹。The shape structure of the nozzle 2 is a combination of a hexagonal prism and a cylinder, the upper part of the nozzle 2 is a short hexagonal prism, the lower part of the nozzle 2 is a cylinder, the short hexagonal prism and the cylinder are coaxial, the middle is a nozzle hole, and the outer side of the cylinder is provided with a thread. .

所述气帽3为橡胶帽。The air cap 3 is a rubber cap.

所述喷嘴接头密封盖4外形与喷嘴2相同，喷嘴接头密封盖4中间没有喷孔，且喷嘴接头密封盖4为实心结构、圆柱外侧设置有螺纹。The shape of the nozzle joint sealing cover 4 is the same as that of the nozzle 2, there is no spray hole in the middle of the nozzle joint sealing cover 4, and the nozzle joint sealing cover 4 is a solid structure with threads provided on the outer side of the cylinder.

掺混空气检测低流速瓦斯抽采管路流量的测定方法，它包含如下步骤：The method for measuring the flow rate of gas extraction pipelines with low flow velocity with mixed air includes the following steps:

步骤S1：在被测瓦斯抽采管路中安装掺混空气检测低流速瓦斯抽采管路流量的测定装置；Step S1: install a measuring device for mixing air in the gas extraction pipeline under test to detect the flow rate of the gas extraction pipeline with low flow velocity;

步骤S2：测定瓦斯抽采管路所处环境空气中的瓦斯浓度

Figure DEST_PATH_IMAGE013
；Step S2: Measure the gas concentration in the ambient air where the gas extraction pipeline is located
Figure DEST_PATH_IMAGE013
;

步骤S3：将气压计与掺混空气检测低流速瓦斯抽采管路流量的测定装置的第一气嘴13连接，测定瓦斯抽采管路的工况负压

Figure 251962DEST_PATH_IMAGE014
；Step S3: Connect the barometer to the first gas nozzle 13 of the measuring device for detecting the flow rate of the gas extraction pipeline with low flow rate of mixed air, and measure the working condition negative pressure of the gas extraction pipeline
Figure 251962DEST_PATH_IMAGE014
;

步骤S4：选择合适型号的喷嘴2安装于掺混空气检测低流速瓦斯抽采管路流量的测定装置的喷嘴接头14上，向管路中喷射空气，并计算获得负压

Figure DEST_PATH_IMAGE015
下喷嘴2的喷射流量
Figure 752213DEST_PATH_IMAGE004
，计算公式如下：Step S4: Select an appropriate type of nozzle 2 and install it on the nozzle joint 14 of the measuring device for measuring the flow rate of the gas extraction pipeline with low flow rate of mixed air, spray air into the pipeline, and calculate the negative pressure
Figure DEST_PATH_IMAGE015
The jet flow rate of the lower nozzle 2
Figure 752213DEST_PATH_IMAGE004
,Calculated as follows:

Figure 736612DEST_PATH_IMAGE005
Figure 736612DEST_PATH_IMAGE005

其中：

Figure 209182DEST_PATH_IMAGE006
为喷嘴2的流量系数，确定喷嘴2型号后
Figure 384948DEST_PATH_IMAGE007
为固定值；in:
Figure 209182DEST_PATH_IMAGE006
is the flow coefficient of nozzle 2, after determining the model of nozzle 2
Figure 384948DEST_PATH_IMAGE007
is a fixed value;

步骤S5：通过掺混空气检测低流速瓦斯抽采管路流量的测定装置的第二气嘴12采集瓦斯抽采管路中气体的气样，测定上游管路中未掺混空气的管道气体的瓦斯浓度

Figure 310179DEST_PATH_IMAGE008
；Step S5: Collect a gas sample of the gas in the gas extraction pipeline through the second gas nozzle 12 of the measuring device for detecting the flow rate of the low-velocity gas extraction pipeline by mixing air, and measure the gas concentration of the pipeline gas in the upstream pipeline that is not mixed with air. Gas concentration
Figure 310179DEST_PATH_IMAGE008
;

步骤S6：通过掺混空气检测低流速瓦斯抽采管路流量的测定装置的第三气嘴15采集气样，测定下游管路中掺混空气后的管路气体的瓦斯浓度

Figure 596804DEST_PATH_IMAGE009
；Step S6: Collect gas samples through the third gas nozzle 15 of the measuring device for detecting the flow rate of the low-velocity gas extraction pipeline by mixing air, and measure the gas concentration of the pipeline gas after mixing air in the downstream pipeline
Figure 596804DEST_PATH_IMAGE009
;

步骤S7：计算获得工况下瓦斯抽采管路中气体的混合流量

Figure 720617DEST_PATH_IMAGE010
：Step S7: Calculate and obtain the mixed flow of gas in the gas extraction pipeline under working conditions
Figure 720617DEST_PATH_IMAGE010
:

Figure 4968DEST_PATH_IMAGE011
。
Figure 4968DEST_PATH_IMAGE011
.

所述喷嘴2型号的选择是否合适，其判定方法为：喷嘴2对管路上游抽采负压

Figure 978347DEST_PATH_IMAGE016
的影响在±10%以内，认为喷嘴2型号合适，否则认为不合适。Whether the selection of the nozzle 2 model is appropriate is determined as follows: the nozzle 2 draws negative pressure on the upstream of the pipeline
Figure 978347DEST_PATH_IMAGE016
If the influence is within ±10%, it is considered that the nozzle 2 model is suitable, otherwise it is considered inappropriate.

本发明的工作原理：主体1进气端、出气端均设置有法兰11，主体1自进气端向出气端依次设置有第二气嘴12、第一气嘴13、喷嘴接头14、第三气嘴15；所述主体1的直径等于抽采管路的直径，且主体1进气端、出气端均与抽采管路通过法兰11连接；所述第二气嘴12、第三气嘴15上均设置有气帽3；第二气嘴12用于采集上游未掺混空气的抽采管路气样，测定未掺混空气的管路瓦斯浓度，第三气嘴15用于采集下游掺混空气后的抽采管路气样，测定掺混空气后管路瓦斯浓度，第二气嘴12、第三气嘴15上均设置有气帽3，在非瓦斯抽采管路流量测定期间封堵第二气嘴12、第三气嘴15；所述第一气嘴13与气压计连接；第一气嘴13与气压计连接测定管路抽采负压；所述喷嘴接头14上设置有连接件5，连接件5包含喷嘴2或喷嘴接头密封盖4中的一种。在瓦斯抽采管路流量测定过程中，喷嘴接头14上设置有喷嘴2，向主体1内部喷射空气，在主体1空间内实现空气与抽采管路瓦斯气体的掺混；在非瓦斯抽采管路流量测定期间，喷嘴接头14上设置有喷嘴接头密封盖4封堵喷嘴接头14，空气入口安装喷嘴2，提高了空气的掺混效率，缩短了掺混距离，确保了空气与管道气体的充分混合，保证了检测结果的准确性；喷嘴2采用系列标准件，根据喷嘴2的负压-流量关系快速计算获得掺混的空气流量，充分考虑了煤矿井下瓦斯抽采的复杂性和多变性，确保了该方法的便捷性和广泛适应性，能够用于不同条件下的低流速瓦斯抽采管路流量的准确测定。The working principle of the present invention: the main body 1 is provided with flanges 11 at the air inlet end and the air outlet end, and the main body 1 is sequentially provided with a second air nozzle 12, a first air nozzle 13, a nozzle joint 14, and a second air nozzle 12 from the air inlet end to the air outlet end. Three gas nozzles 15; the diameter of the main body 1 is equal to the diameter of the extraction pipeline, and the inlet and outlet ends of the main body 1 are connected with the extraction pipeline through the flange 11; the second gas nozzle 12, the third gas nozzle The gas nozzles 15 are all provided with gas caps 3; the second gas nozzle 12 is used to collect the gas sample of the upstream unmixed air extraction pipeline to measure the gas concentration of the unmixed pipeline pipeline, and the third gas nozzle 15 is used to Collect the gas sample of the extraction pipeline after mixing with air downstream, and measure the gas concentration of the pipeline after mixing with air. The second gas nozzle 12 and the third gas nozzle 15 are both provided with gas caps 3. In the non-gas extraction pipeline During the flow measurement, the second gas nozzle 12 and the third gas nozzle 15 are blocked; the first gas nozzle 13 is connected with the barometer; the first gas nozzle 13 is connected with the barometer to measure the negative pressure of the pipeline; the nozzle joint 14 is provided with a connecting piece 5, and the connecting piece 5 includes one of the nozzle 2 or the nozzle joint sealing cover 4. In the process of measuring the flow rate of the gas extraction pipeline, the nozzle joint 14 is provided with a nozzle 2, which sprays air into the main body 1, and realizes the mixing of the air and the gas in the gas extraction pipeline in the space of the main body 1; During the flow measurement of the pipeline, the nozzle joint 14 is provided with a nozzle joint sealing cover 4 to block the nozzle joint 14, and the air inlet is installed with the nozzle 2, which improves the air mixing efficiency, shortens the mixing distance, and ensures the air and pipeline gas. Fully mixed to ensure the accuracy of the test results; Nozzle 2 adopts a series of standard parts, according to the negative pressure-flow relationship of nozzle 2 to quickly calculate and obtain the mixed air flow, fully considering the complexity and variability of underground gas extraction in coal mines , which ensures the convenience and wide adaptability of the method, and can be used for the accurate determination of the flow rate of the gas extraction pipeline with low flow velocity under different conditions.

列举实例进行说明：例如，按照结构不同分为柱形喷嘴、锥形喷嘴、文丘里喷嘴等多个系列，每个系列包含有多个型号，不同型号喷嘴的喷嘴直径和喷孔大小不同，喷嘴直径包括4分、6分、1寸、1.5寸、2寸、2.5寸、3寸、4寸等规格，喷孔直径包括4mm、6mm、8mm、10mm、15mm、20mm、30mm、40mm、50mm等规格。不同直径的喷嘴能够满足不同抽采管路尺寸的要求，不同喷孔大小能够满足不同空气掺混量的要求，使得该方法具有很强的现场适应性，能够实现不同条件下的低流速瓦斯抽采管路流量的测定。Examples are given to illustrate: for example, according to different structures, it is divided into multiple series such as cylindrical nozzles, conical nozzles, Venturi nozzles, etc. Each series contains multiple models. The diameter includes 4 minutes, 6 minutes, 1 inch, 1.5 inches, 2 inches, 2.5 inches, 3 inches, 4 inches, etc., and the diameter of the nozzle holes includes 4mm, 6mm, 8mm, 10mm, 15mm, 20mm, 30mm, 40mm, 50mm, etc. Specification. Different diameter nozzles can meet the requirements of different extraction pipeline sizes, and different nozzle hole sizes can meet the requirements of different air mixing amounts, which makes the method have strong field adaptability and can realize low flow rate gas extraction under different conditions. Measurement of pipeline flow.

采用上述技术方案后，本发明有益效果为：检测装置测量精度高、准确性好，通过向瓦斯抽采管道掺混一定量的空气，测定掺混空气前后瓦斯抽采管路中瓦斯浓度的变化情况，实现了低流速瓦斯抽采管路流量的准确测量，能够用于钻孔、钻场等抽采系统末端流量检测，有助于瓦斯抽采量的精准计量，提高瓦斯抽采达标评判的准确性，对于煤矿瓦斯防治具有重要意义。After the above technical scheme is adopted, the beneficial effects of the present invention are: the detection device has high measurement precision and good accuracy, and by mixing a certain amount of air into the gas extraction pipeline, the change of the gas concentration in the gas extraction pipeline before and after mixing with air is measured. It realizes the accurate measurement of the flow rate of the gas drainage pipeline at low flow rate, and can be used for the flow detection at the end of the drainage system such as drilling holes and drilling sites, which is helpful for the accurate measurement of the gas drainage amount and improves the evaluation of gas drainage compliance. Accuracy is of great significance for coal mine gas prevention and control.

提高了空气的掺混效率，缩短了掺混距离，确保了空气与管道气体的充分混合，保证了检测结果的准确性；充分考虑了煤矿井下瓦斯抽采的复杂性和多变性，确保了该方法的便捷性和广泛适应性，能够用于不同条件下的低流速瓦斯抽采管路流量的准确测定。The air mixing efficiency is improved, the mixing distance is shortened, the air and the pipeline gas are fully mixed, and the accuracy of the detection results is ensured; The convenience and wide adaptability of the method can be used to accurately measure the flow rate of gas drainage pipelines with low flow velocity under different conditions.

以上所述，仅用以说明本发明的技术方案而非限制，本领域普通技术人员对本发明的技术方案所做的其它修改或者等同替换，只要不脱离本发明技术方案的精神和范围，均应涵盖在本发明的权利要求范围当中。The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be Included within the scope of the claims of the present invention.

Claims (9)

1. The utility model provides an adopt mixing air detection low velocity of flow gas drainage pipeline flow measurement device which characterized in that: the air nozzle comprises a main body (1), a nozzle (2), an air cap (3), a nozzle joint sealing cover (4), a connecting piece (5), a flange (11), a second air nozzle (12), a first air nozzle (13), a nozzle joint (14) and a third air nozzle (15), wherein the flange (11) is arranged at the air inlet end and the air outlet end of the main body (1), and the second air nozzle (12), the first air nozzle (13), the nozzle joint (14) and the third air nozzle (15) are sequentially arranged on the main body (1) from the air inlet end to the air outlet end;
the diameter of the main body (1) is equal to that of the extraction pipeline, and the gas inlet end and the gas outlet end of the main body (1) are connected with the extraction pipeline through flanges (11);
the second air nozzle (12) and the third air nozzle (15) are both provided with air caps (3);
the first air nozzle (13) is connected with the barometer;
the nozzle joint (14) is provided with a connecting piece (5), and the connecting piece (5) comprises one of a nozzle (2) or a nozzle joint sealing cover (4).
2. The device for detecting the flow of the low-flow-rate gas extraction pipeline by adopting the blended air according to claim 1 is characterized in that: the distance between the nozzle joint (14) and the first air nozzle (13) is not less than 2 times of the inner diameter of the main body (1), and the distance between the nozzle joint (14) and the third air nozzle (15) is not less than 4 times of the inner diameter of the main body (1).
3. The device for detecting the flow of the low-flow-rate gas extraction pipeline by adopting the blended air according to claim 1 is characterized in that: the nozzle (2) is a series of standard parts.
4. The device for detecting the flow of the low-flow-rate gas extraction pipeline by adopting the blended air according to claim 1 is characterized in that: the inner wall of the nozzle joint (14) is provided with internal threads.
5. The device for detecting the flow of the low-flow-rate gas extraction pipeline by adopting the blended air according to claim 1 is characterized in that: the appearance structure of nozzle (2) is the combination form of hexagonal prism and cylinder, and nozzle (2) upper portion is short hexagonal prism, and nozzle (2) lower part is the cylinder, and short hexagonal prism, cylinder two are coaxial, and the centre is the orifice, and the cylinder outside is provided with the screw thread.
6. The device for detecting the flow of the low-flow-rate gas extraction pipeline by adopting the blended air according to claim 1 is characterized in that: the air cap (3) is a rubber cap.
7. The device for detecting the flow of the low-flow-rate gas extraction pipeline by adopting the blended air according to claim 1 is characterized in that: the shape of the nozzle joint sealing cover (4) is the same as that of the nozzle (2), no spray hole is formed in the middle of the nozzle joint sealing cover (4), and the nozzle joint sealing cover (4) is of a solid structure and is provided with threads on the outer side of a cylinder.
8. A method for detecting the flow of a low-flow-rate gas extraction pipeline by using mixed air is characterized by comprising the following steps of:
step S1: installing a measuring device for detecting the flow of the low-flow-rate gas extraction pipeline by mixing air in the detected gas extraction pipeline;
step S2: method for measuring gas concentration in ambient air of gas extraction pipeline
Figure 453810DEST_PATH_IMAGE002
；
Step S3: connecting a barometer with a first air nozzle 13 of a device for detecting the flow of a low-flow-rate gas extraction pipeline by mixing air to determine the working condition negative pressure of the gas extraction pipeline
Figure 635393DEST_PATH_IMAGE004
；
Step S4: selecting a nozzle 2 with a proper model to be arranged on a nozzle joint 14 of a measuring device for detecting the flow of a low-flow-rate gas extraction pipeline by mixing air, spraying air into the pipeline, and calculating to obtain negative pressure
Figure DEST_PATH_IMAGE005
Jet flow of the lower nozzle 2
Figure DEST_PATH_IMAGE007
The calculation formula is as follows:
Figure DEST_PATH_IMAGE009
wherein:
Figure DEST_PATH_IMAGE011
determining the type of the nozzle 2 for the flow coefficient of the nozzle 2
Figure 572868DEST_PATH_IMAGE012
Is a fixed value;
step S5: the second air nozzle 12 of the device for detecting the flow of the low-flow-rate gas extraction pipeline by mixing air collects gas samples of gas in the gas extraction pipeline, and measures the gas concentration of pipeline gas which is not mixed with air in an upstream pipeline
Figure 535008DEST_PATH_IMAGE014
；
Step S6: the third air nozzle 15 of the measuring device for detecting the flow of the low-flow-rate gas extraction pipeline by mixing air collects a gas sample, and the gas concentration of the pipeline gas mixed with air in the downstream pipeline is measured
Figure 101119DEST_PATH_IMAGE016
；
Step S7: calculating and obtaining the mixed flow of the gas in the gas extraction pipeline under the working condition
Figure 793000DEST_PATH_IMAGE018
：
Figure 717356DEST_PATH_IMAGE020
。
9. The method for detecting the flow of the low-flow-rate gas extraction pipeline by using the blended air according to claim 9 is characterized in that: whether the selection of the model of the nozzle 2 is proper or not is judged by the following method: nozzle 2 extracts negative pressure to pipeline upstream
Figure DEST_PATH_IMAGE022
Within ± 10%, the nozzle 2 model is considered to be appropriate, otherwise it is considered to be inappropriate.
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