CN209280100U - A kind of negative-pressure pneumatic conveying experimental provision - Google Patents
A kind of negative-pressure pneumatic conveying experimental provision Download PDFInfo
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Abstract
本实用新型属于气动管道输送技术领域，涉及负压气力输送实验装置。一种负压气力输送实验装置，包括负压装置、输送管道、喂料机；所述喂料机设置在输送管道的前端，负压装置设置在输送管道的末端；所述喂料机与负压装置之间的输送管道上设置有质量流量计；所述喂料机的下方设有电子秤。本实用新型的负压气力输送实验装置，解决了实验装置与实际工程装备因为缩尺比的因素引起的实验误差问题，能够真实的模拟出不同风速和不同喂料量的情况下物料在管线中的流动状态，提高物料质量流量计的校核精度。
The utility model belongs to the technical field of pneumatic pipeline transportation and relates to a negative pressure pneumatic transportation experiment device. A negative pressure pneumatic conveying experimental device, comprising a negative pressure device, a delivery pipeline, and a feeder; the feeder is arranged at the front end of the delivery pipeline, and the negative pressure device is arranged at the end of the delivery pipeline; the feeder and the negative pressure A mass flow meter is arranged on the conveying pipeline between the pressure devices; an electronic scale is arranged under the feeder. The negative pressure pneumatic conveying experimental device of the utility model solves the experimental error problem caused by the scale ratio between the experimental device and the actual engineering equipment, and can truly simulate the material flow in the pipeline under different wind speeds and different feeding volumes. The flow state of the material flowmeter can be improved to improve the calibration accuracy of the material mass flowmeter.
Description
技术领域technical field
本实用新型属于气动管道输送技术领域，涉及负压气力输送实验装置。The utility model belongs to the technical field of pneumatic pipeline transportation and relates to a negative pressure pneumatic transportation experiment device.
背景技术Background technique
气力输送技术是指利用气流的能量，在密闭管道内沿气流方向输送颗粒状物料。根据压力特征的不同，气力输送系统分为正压气力输送系统和负压气力输送系统。负压气力输送是通过系统终点的风机抽吸系统内的空气，形成负压气流，气流携带物料从吸嘴进入系统并到达终点，最后经过滤分离将空气排放到大气中。由于管道沿程所有的空气均是向内泄漏，安全环保，同时系统可以从多处供料点吸送物料，输送灵活方便，因而在物流、能源、化工、冶金、农业、环保、领域得到了广泛应用。但是，由于气力输送是气固两相流，情况十分复杂，气力输送技术的设计计算尚处于经验阶段。Pneumatic conveying technology refers to the use of the energy of airflow to transport granular materials along the direction of airflow in a closed pipeline. According to the different pressure characteristics, the pneumatic conveying system is divided into a positive pressure pneumatic conveying system and a negative pressure pneumatic conveying system. Negative pressure pneumatic conveying is to use the fan at the end of the system to suck the air in the system to form a negative pressure airflow. The airflow carries the material from the suction nozzle into the system and reaches the end point, and finally the air is discharged into the atmosphere after filtration and separation. Because all the air along the pipeline leaks inward, it is safe and environmentally friendly. At the same time, the system can suck and deliver materials from multiple feeding points, and the transportation is flexible and convenient. Therefore, it has been widely used in logistics, energy, chemical industry, metallurgy, agriculture, environmental protection, and other fields. widely used. However, since pneumatic conveying is a gas-solid two-phase flow, the situation is very complicated, and the design and calculation of pneumatic conveying technology is still in the empirical stage.
负压气力输送技术中，固态物料的质量流量是重要的工艺操作参数，其能否准确的测量直接影响了生产装置的稳定安全运行。目前物料的的质量流量测量的方法主要有电学法、微波法、射线法等等。由于气力输送技术中，管道内气固两相流动复杂，如不同的输送物料和操作条件下，特别是管道截面固相浓度分布的不均匀，都会影响固体质量流量计的准确测量，因此需要对固体质量流量计进行标定。目前质量流量计进行标定的主要方法是通过进料系统中料仓的物料进料量进行称重，根据称重数据对输料管道上的固体质量流量计进行标定。In the negative pressure pneumatic conveying technology, the mass flow rate of solid materials is an important process operation parameter, and whether it can be measured accurately directly affects the stable and safe operation of the production device. At present, the mass flow measurement methods of materials mainly include electrical method, microwave method, ray method and so on. Due to the complexity of the gas-solid two-phase flow in the pipeline in the pneumatic conveying technology, such as under different conveying materials and operating conditions, especially the uneven distribution of the solid phase concentration in the pipeline cross-section, it will affect the accurate measurement of the solid mass flowmeter, so it is necessary to The solid mass flowmeter is calibrated. At present, the main method of calibrating mass flowmeters is to weigh the material feed volume of the silo in the feeding system, and calibrate the solid mass flowmeter on the feeding pipeline according to the weighing data.
现场进行进料量称重的方式存在较大的缺陷，严重影响生产工艺的稳定安全运行。首先物料称重在实际的生产过程中，输送物料的管线始终与料仓相连，为称重的精度引入误差；其次实际生产的物料输送管线按照现场场地限制布置，不一定有位置可以安装固体质量流量计，为标定工作带来困难；最后，料仓中物料的减少量与物料输送管线中物料的质量流量存在时间和空间上的差异，不能准确的实现实时在线标定。华东理工大学大学设计了一种固体质量流量计标定装置和使用方法以及含其的系统（CN200910050837.6），为正压气力输送系统，难以完成负压气力输送系统中质量流量计的标定工作。There are relatively large defects in the way of weighing the feed amount on site, which seriously affects the stable and safe operation of the production process. First of all, in the actual production process of material weighing, the pipeline for conveying materials is always connected with the silo, which introduces errors for the accuracy of weighing; secondly, the actual production of material conveying pipelines is arranged according to the site restrictions, and there may not be a place to install solid mass The flow meter brings difficulties to the calibration work; finally, there are time and space differences between the reduction of the material in the silo and the mass flow rate of the material in the material delivery pipeline, and real-time online calibration cannot be accurately realized. East China University of Science and Technology designed a solid mass flowmeter calibration device and method of use and a system containing it (CN200910050837.6), which is a positive pressure pneumatic conveying system, and it is difficult to complete the calibration of mass flowmeters in negative pressure pneumatic conveying systems.
实用新型内容Utility model content
本实用新型的目的是解决现有技术的问题，提供一种负压气力输送实验装置。The purpose of the utility model is to solve the problems of the prior art and provide a negative pressure pneumatic conveying experimental device.
本实用新型解决其技术问题采用的技术方案是：一种负压气力输送实验装置，包括负压装置、输送管道、喂料机；所述喂料机设置在输送管道的前端，负压装置设置在输送管道的末端；所述喂料机与负压装置之间的输送管道上设置有质量流量计；所述喂料机的下方设有电子秤。The technical solution adopted by the utility model to solve the technical problems is: a negative pressure pneumatic conveying experimental device, including a negative pressure device, a conveying pipeline, and a feeder; the feeder is arranged at the front end of the conveying pipeline, and the negative pressure device At the end of the conveying pipeline; a mass flow meter is arranged on the conveying pipeline between the feeder and the negative pressure device; an electronic scale is arranged below the feeder.
进一步的，所述的输送管道分为三段，依次为水平段、垂直段、水平段；在上述每一管段大约中间位置设置标定点安装质量流量计。Further, the conveying pipeline is divided into three sections, which are horizontal section, vertical section, and horizontal section in sequence; a calibration point is installed at approximately the middle position of each of the above-mentioned pipe sections and a mass flow meter is installed.
进一步的，所述的质量流量计的前方设有视镜，后方设有温度传感器和压力传感器。Further, the front of the mass flow meter is provided with a mirror, and the rear is provided with a temperature sensor and a pressure sensor.
进一步的，所述的喂料机的前方管道上设有风速传感器、温度传感器和压力传感器。Further, the front pipeline of the feeder is provided with a wind speed sensor, a temperature sensor and a pressure sensor.
进一步的，所述的输送管道入口设有过滤网。Further, the inlet of the conveying pipeline is provided with a filter.
进一步的，所述输送管道上安装的设备和仪器均与输送管道密封连接。Further, the equipment and instruments installed on the delivery pipeline are all sealed and connected with the delivery pipeline.
本实用新型的负压气力输送实验装置，解决了实验装置与实际工程装备因为缩尺比的因素引起的实验误差问题，能够真实的模拟出不同风速和不同喂料量的情况下物料在管线中的流动状态，提高物料质量流量计的校核精度。The negative pressure pneumatic conveying experimental device of the utility model solves the experimental error problem caused by the scale ratio between the experimental device and the actual engineering equipment, and can truly simulate the material flow in the pipeline under different wind speeds and different feeding volumes. The flow state of the material flowmeter can be improved to improve the calibration accuracy of the material mass flowmeter.
附图说明Description of drawings
图1是本实用新型的负压气力输送实验装置的结构示意图。Fig. 1 is a schematic structural view of the negative pressure pneumatic conveying experimental device of the present invention.
具体实施方式Detailed ways
下面结合附图和实施例对本实用新型的负压气力输送实验装置作详细的说明。The negative pressure pneumatic conveying experimental device of the present utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.
本实用新型的负压气力输送实验装置，结构连接如图1所示，主要包括以下结构：工业吸尘器1、风速传感器4、喂料机5、温度传感器7、压力传感器8、电子秤9、视镜10、质量流量计11、物料输送管道14。The negative pressure pneumatic conveying experimental device of the present utility model is structurally connected as shown in Figure 1, mainly including the following structures: industrial vacuum cleaner 1, wind speed sensor 4, feeder 5, temperature sensor 7, pressure sensor 8, electronic scale 9, Mirror 10, mass flow meter 11, material delivery pipeline 14.
喂料机5通过软连接管15与物料输送管道14的前端连接。喂料机5与软连接管15的连接处安装有止回阀6。喂料机5放置在电子秤9上。作为本实用新型的一种优选方式，喂料机5的电机为变频电机，可以调节喂料量，满足不同实验需求。The feeder 5 is connected to the front end of the material conveying pipeline 14 through a flexible connecting pipe 15 . A check valve 6 is installed at the connection between the feeder 5 and the flexible connecting pipe 15 . Feeding machine 5 is placed on the electronic scale 9. As a preferred mode of the present invention, the motor of the feeder 5 is a variable frequency motor, which can adjust the feeding amount to meet different experimental requirements.
工业吸尘器1通过吸尘器软管13和变径接头12与物料输送管道14的末端连接。工业吸尘器可以通过不同的档位和配合物料输送管道入口处的手动阀门开闭大小产生不同的风量。The industrial vacuum cleaner 1 is connected to the end of the material conveying pipeline 14 through a vacuum cleaner hose 13 and a reducing joint 12 . Industrial vacuum cleaners can generate different air volumes through different gears and the opening and closing of manual valves at the entrance of the material conveying pipeline.
物料输送管14的入口3设有过滤网2。整个物料输送管道14依次分为入口段A、第一水平段B、垂直段C、第二水平段D；在入口段A安装有手动阀16和风速传感器4。The inlet 3 of the material conveying pipe 14 is provided with a filter screen 2 . The entire material conveying pipeline 14 is divided into an inlet section A, a first horizontal section B, a vertical section C, and a second horizontal section D in turn; a manual valve 16 and a wind speed sensor 4 are installed in the inlet section A.
物料输送管14为钢质管，管径为102mm，吸尘器软管13为塑料管，管径为50mm。The material delivery pipe 14 is a steel pipe with a pipe diameter of 102 mm, and the vacuum cleaner hose 13 is a plastic pipe with a pipe diameter of 50 mm.
喂料机5安装在第一水平段B的前端，其前方安装温度传感器7、压力传感器8。喂料机5的后方依次安装视镜10、质量流量计11、温度传感器7、压力传感器8。The feeder 5 is installed at the front end of the first horizontal section B, and a temperature sensor 7 and a pressure sensor 8 are installed in its front. A sight glass 10, a mass flow meter 11, a temperature sensor 7, and a pressure sensor 8 are installed in sequence at the rear of the feeder 5.
在垂直段C依次安装有视镜10、质量流量计11、温度传感器7、压力传感器8。In the vertical section C, a sight glass 10, a mass flow meter 11, a temperature sensor 7, and a pressure sensor 8 are sequentially installed.
在第二水平段D上也依次安装有视镜10、质量流量计11、温度传感器7、压力传感器8。A sight glass 10 , a mass flow meter 11 , a temperature sensor 7 and a pressure sensor 8 are also sequentially installed on the second horizontal section D.
在上述两个水平段和一个垂直段中，管段的大约中间位置处设有标定点，质量流量计11安装在该标定点处。In the above two horizontal sections and one vertical section, a calibration point is provided approximately in the middle of the pipe section, and the mass flow meter 11 is installed at the calibration point.
物料输送管14上安装的设备和仪器均与输送管道密封连接。The equipment and instruments installed on the material conveying pipe 14 are all sealed and connected with the conveying pipeline.
本实用新型的负压气力输送实验装置，工作原理过程如下：The working principle of the negative pressure pneumatic conveying experimental device of the present invention is as follows:
（1）根据实验需求将质量流量计安装在物料输送管上的水平段和垂直段，将实验物料投入到5喂料机中；(1) Install the mass flowmeter on the horizontal section and the vertical section of the material conveying pipe according to the experimental requirements, and put the experimental material into the 5 feeder;
（2）开启手动阀16，关闭止回阀6，打开工业吸尘器1，将管道中的杂质和上次实验残留的实验物料吸入到工业吸尘器中，关闭工业吸尘器1，将工业吸尘器1的除尘袋中的杂质和物料清理干净；(2) Open the manual valve 16, close the check valve 6, open the industrial vacuum cleaner 1, suck the impurities in the pipeline and the experimental materials left over from the previous experiment into the industrial vacuum cleaner, close the industrial vacuum cleaner 1, and put the dust bag of the industrial vacuum cleaner 1 Impurities and materials in the tank are cleaned up;
（3）再次打开工业吸尘器1，调节手动阀16的开闭程度，使风速传感器4显示的风速达到实验要求的风速；(3) Turn on the industrial vacuum cleaner 1 again, adjust the opening and closing degree of the manual valve 16, so that the wind speed displayed by the wind speed sensor 4 reaches the wind speed required by the experiment;
（4）观察四组压力传感器压力显示值，待物料输送管道内压力稳定时，打开止回阀6，并同时打开喂料机5，调节喂料机5的变频电机，使喂料机5的喂料量达到实验要求的喂料量；(4) Observe the pressure display values of the four sets of pressure sensors. When the pressure in the material conveying pipeline is stable, open the check valve 6 and open the feeder 5 at the same time, adjust the frequency conversion motor of the feeder 5 to make the feeder 5 The feeding amount reaches the feeding amount required by the experiment;
（5）观察两个水平段和一个垂直段的视镜中物料流动状态，直到物料流动稳定后，每隔10s记录喂料机5下边电子秤9的读数以及实验管段质量流量计的读数，同时记录各个管段处的温度和压力；(5) Observe the material flow state in the sight glass of two horizontal sections and one vertical section, until the material flow is stable, record the reading of the electronic scale 9 under the feeder 5 and the reading of the mass flowmeter of the experimental pipe section every 10s, and at the same time Record the temperature and pressure at each pipe section;
（6）实验进行一段时间得到足够的实现数据后，关闭喂料机5，关闭止回阀6；(6) After the experiment has been carried out for a period of time to obtain enough realization data, close the feeder 5 and close the check valve 6;
（7）观察三个实验管段处视镜，直到管路中没有物料残余后关闭工业吸尘器1，关闭手动阀16，将工业吸尘器1中的除尘袋中的物料清理出来，放入物料回收站；(7) Observe the sight glass at the three experimental pipe sections until there is no material residue in the pipeline, then close the industrial vacuum cleaner 1, close the manual valve 16, clean out the materials in the dust removal bag in the industrial vacuum cleaner 1, and put them into the material recycling station;
（8）设某一时刻质量流量计的质量流量读数为ZN,同一时刻喂料机下方的电子秤读数为WN，用ZN与（WN-1-WN+1）/20s的值进行校核，从而完成质质量流量计的标定工作。(8) Let the mass flow reading of the mass flow meter at a certain moment be Z N , and the reading of the electronic scale under the feeder at the same time be W N , use the ratio of Z N and (W N-1 -W N+1 )/20s The value is checked to complete the calibration of the mass flowmeter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109855706A (en) * | 2018-12-20 | 2019-06-07 | 山东省科学院海洋仪器仪表研究所 | A kind of negative-pressure pneumatic conveying experimental provision and experimental method |
| WO2024017414A1 (en) * | 2022-11-25 | 2024-01-25 | 江苏徐工工程机械研究院有限公司 | Pneumatic conveying system and optimal configuration method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109855706A (en) * | 2018-12-20 | 2019-06-07 | 山东省科学院海洋仪器仪表研究所 | A kind of negative-pressure pneumatic conveying experimental provision and experimental method |
| CN109855706B (en) * | 2018-12-20 | 2024-03-29 | 山东省科学院海洋仪器仪表研究所 | Negative pressure pneumatic conveying experimental device and experimental method |
| WO2024017414A1 (en) * | 2022-11-25 | 2024-01-25 | 江苏徐工工程机械研究院有限公司 | Pneumatic conveying system and optimal configuration method |
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