CN212483066U - An Oil Mist Sampling System Based on CFD Simulation - Google Patents
An Oil Mist Sampling System Based on CFD Simulation Download PDFInfo
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- CN212483066U CN212483066U CN202022087868.3U CN202022087868U CN212483066U CN 212483066 U CN212483066 U CN 212483066U CN 202022087868 U CN202022087868 U CN 202022087868U CN 212483066 U CN212483066 U CN 212483066U
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- oil mist
- sampling system
- cfd simulation
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Abstract
本实用新型公开了一种基于CFD模拟的油雾采样系统。该系统主要由油雾发生系统、混合区及采样系统三个部分组成。空压机将液态油压出后形成油雾与一定比例的空气混合，在混合区内将低浓度油雾控制均匀，通过经CFD模拟优化后的半挥发性二分采样器，可以精确测量油雾中颗粒相和气相污染物的浓度。本实用新型通过CFD模拟优化虚拟冲击器的设计参数，可以有效地降低壁损以提高油雾中颗粒物和气态污染物的分离效率。
The utility model discloses an oil mist sampling system based on CFD simulation. The system is mainly composed of three parts: oil mist generation system, mixing area and sampling system. The air compressor presses out the liquid oil to form oil mist and mixes it with a certain proportion of air, and controls the low-concentration oil mist evenly in the mixing area. Through the semi-volatile binary sampler optimized by CFD simulation, the oil mist can be accurately measured Concentrations of particulate and gas-phase pollutants in the medium. The utility model optimizes the design parameters of the virtual impactor through CFD simulation, which can effectively reduce the wall loss and improve the separation efficiency of particulate matter and gaseous pollutants in the oil mist.
Description
Technical Field
The utility model relates to a pollutant sampling technical field, concretely relates to oil mist sampling system based on CFD simulation.
Background
The semi-volatile aerosol is generated from semi-volatile organic compounds, and has vapor pressure of 10-11-10-4Between atm, which, due to its low vapour pressure, is present in both the particulate and gaseous phase, and oil mist is a typical semi-volatile aerosol in professional settings. As is well known, a great deal of high-concentration oil mist is generated due to the use of a large amount of metal cutting fluid in the machining industry, and the physical and psychological health of workers can be greatly influenced due to long-term contact, so that the significance of accurately measuring the concentration of the oil mist is great. Previous studies have shown that a virtual impactor can effectively separate semi-volatile aerosol, since the last 80 th century, a virtual impactor has been widely used for atmospheric sampling, and the research on design and performance evaluation of a circular nozzle virtual impactor by foreign scholars in 1988 is regarded as a standard in the field of virtual impactor design. To date, numerical simulation and experimental research around virtual impactors have matured, and related prototype devices are developed successively, but due to the principle limitations, performance is affected by many factors, such as the design of incident angle, nozzle spacing, nozzle size, split ratio, reynolds number, and other parameters, and the widely existing cross-track phenomenon affects the cut-off particle size, separation efficiency, and wall damage. Generally, a good performing virtual impactor should have a lower cut-off particle size, lower wall loss, and a better cutting performance curve, as well as a higher cost/performance ratio. In addition, related researches on oil mist sampling are few in China, and a mature sampling system is lacked. Therefore, an oil mist sampling system based on CFD simulation is provided, optimized design parameters are obtained by comparing three-dimensional simulation results in Fluent software, and then a semi-volatile binary sampler is manufactured by means of the 3D printing technology which is increasingly widespread nowadays, so that particle phase and gas phase pollutants in oil mist are accurately separated through the sampling system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the not enough of above-mentioned current oil mist sampling technique, provide an oil mist sampling system based on CFD simulation.
The utility model discloses a solve the problem that proposes in the background art, the technical scheme of adoption is: the utility model discloses an oil mist sampling system based on CFD simulation, including oil mist generation system, mixing area and sampling system, oil mist generation system includes oil mist generator, air compressor machine, air-vent valve, oil water separator, glass rotameter, drying tube, mass flow control meter and display instrument, and its main function is to let oil mist and air ratio into oil mist mixing area in order to control oil mist concentration limit value; the oil mist mixing area comprises an acrylic cabin, a rectification cellular network, a flow equalizing plate, an HEPA filter screen, a centrifugal induced draft fan and a frequency converter, and the main function of the oil mist mixing area is to control the concentration of oil mist in the cabin to be stable; the oil mist sampling system comprises a virtual impactor, a dust detector and a temperature and humidity sensor, a main stream outlet of the virtual impactor is sequentially connected with a Tenax adsorption tube and a vacuum pump, a secondary stream outlet of the virtual impactor is sequentially connected with a cylindrical electrostatic sampler, a filter and a vacuum pump, a central fixed copper wire of the cylindrical electrostatic sampler is connected with a high-voltage power supply, a shell is grounded, and an inner wall is attached to aluminum foil paper.
The rectifying cellular network is a customized regular hexagonal aluminum network and can play a role in flow equalization.
The diameter of the cylindrical electrostatic sampler is 20mm, the height of the cylindrical electrostatic sampler is 100mm, and the collection efficiency calculated by a Deutsch formula under a given high pressure is over 90 percent.
The copper wire at the center of the cylindrical electrostatic sampler is fixed by a custom screw and is made of insulating resin.
The virtual impactor geometric model is subjected to simulation optimization through Fluent software.
The virtual impactor is manufactured by a low-cost 3D printing technology, the material of the virtual impactor can be photosensitive resin or stainless steel, and the precision is about +/-0.1 mm.
The filter is a precision filter, the model is 015QPS, and can remove dust, remove water, deoil.
The sampling system comprises two dust monitors and a temperature and humidity sensor, wherein the models of the dust monitors are DustTrak 8533 and TSI 3330 respectively, the dust monitors are used for monitoring the stability of the oil mist concentration at a sampling position, and the dust monitors are used for acquiring the accurate particle concentration and particle size distribution; the temperature and humidity sensor is TH10S-B and is used for monitoring environmental parameters of the sampling position in real time.
Two dust monitors and a temperature and humidity sensor of the sampling system sample at the tail end of the acrylic cabin.
Advantageous effects
The utility model discloses an oil mist sampling system based on CFD simulation is one set of perfect even oil, accurate sampling system of sending out, particulate matter and gaseous pollutant in separation and the ration oil mist that can be accurate. The system is low in construction cost and easy to deploy, and can be applied to assessment of exposure level of semi-volatile aerosol in occupational sites.
Drawings
FIG. 1 is a schematic diagram of an experimental system of the present invention;
FIG. 2 is a diagram showing the simulated contrast of different types of samplers according to the present invention;
fig. 3 is a standard three-view diagram of the middle sampler of the present invention: a-front view, b-left view, c-top view;
fig. 4 is a sectional view of the sampler in the present invention in the direction of a-a.
Wherein: 1. the device comprises an oil mist generator, 2, an air compressor, 3, a pressure regulating valve, 4, an oil-water separator, 5, a mass flow controller, 6, a flow display instrument, 7, an acrylic cabin, 8, a glass rotor flow meter, 9, a drying pipe, 10, a rectification cellular network, 11, a flow equalizing plate, 12, a vacuum pump, 13, a BGG negative high-voltage power supply, 14, a QPS filter, 15, a cylindrical electrostatic sampler, 16, a virtual impactor, 17, a centrifugal induced draft fan, 18, a frequency converter, 19, a HEPA filter screen, 20, a dust detector, 21, a temperature and humidity sensor, 22, a Tenax adsorption pipe, 23 and an insulating resin screw.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are used to illustrate the present invention but are not intended to limit the scope of the invention.
Fig. 1 is the utility model discloses an experimental system structure chart, the utility model provides an oil mist sampling system based on CFD simulation, including oil mist generation system, mixing area and sampling system, oil mist generation system includes oil mist generator 1, air compressor machine 2, air-vent valve 3, oil water separator 4, glass rotameter 8, drying tube 9, mass flow controller 5 and display 6, and its main function is to let oil mist and air into oil mist mixing area with certain proportion in order to control oil mist concentration limit; the oil mist mixing area comprises an acrylic cabin 7, a rectification cellular network 10, a flow equalizing plate 11, an HEPA filter screen 19, a centrifugal induced draft fan 17 and a frequency converter 18, and the main function of the oil mist mixing area is to control the concentration of oil mist in the cabin to be stable; oil mist sampling system includes virtual impacter 16, dust detector 20, temperature and humidity sensor 21, virtual impacter 16 mainstream exit connects gradually Tenax adsorption tube 22 and vacuum pump 12, and the secondary flow export connects gradually cylinder static sample thief 15, filter 14, vacuum pump 12, the fixed copper wire in cylinder static sample thief 15 center connects high voltage power supply 13, shell ground connection, the attached aluminium foil paper of inner wall. The rectifying cellular network 10 is a customized regular hexagonal aluminum network, and can play a role in current sharing. The diameter of the cylindrical electrostatic sampler 15 is 20mm, the height is 100mm, and the collection efficiency calculated by the Deutsch formula under given high pressure is over 90 percent. The copper wire at the center of the cylindrical electrostatic sampler 15 is fixed by a custom screw 23 and is made of insulating resin. The virtual impactor 16 geometric model is optimized by simulation using Fluent software. The virtual impactor 16 is manufactured by a low-cost 3D printing technology, and the material of the virtual impactor can be photosensitive resin or stainless steel, and the precision is about +/-0.1 mm. The filter 14 is a precision filter, the model of which is 015QPS, and can remove dust, water and oil. The sampling system comprises two dust monitors 20 and a temperature and humidity sensor 21, wherein the models of the dust monitors 20 are DustTrak 8533 and TSI 3330 respectively, the dust monitors are used for monitoring the stability of the concentration of oil mist at a sampling position, and the dust monitors are used for acquiring accurate particle concentration and particle size distribution; the temperature and humidity sensor 21 is of the type TH10S-B and is used for monitoring environmental parameters of a sampling position in real time. Two dust monitors 20 and a temperature and humidity sensor 21 of the sampling system sample at the tail end of the acrylic cabin 7.
Fig. 2 is the simulation contrast diagram of different forms of samplers in the utility model, through Ansys's fluent18.2 software to the three-dimensional model of virtual impacter optimization of simulating, has emphatically analyzed here the influence of the form of virtual impacter receiving nozzle to its separation efficiency and wall loss, and the result shows that fillet and the receiving nozzle cutting performance curve of form of dispersing are better than the nozzle of right angle form, have higher separation efficiency promptly. The wall loss of the receiving nozzle in the form of a fillet in the sampler is far less than that of the nozzle in the form of a right angle and a divergence, and the wall loss curves of the receiving nozzle and the nozzle have small difference, and both have higher wall loss. Consequently the utility model discloses the nozzle of fillet form has been taken during the design, and the design of all the other parameters is then based on the generally recognized experience numerical value of industry.
Fig. 3 and fig. 4 are a standard three-view and a sectional view along the direction a-a of the middle sampler of the present invention, respectively, and the units are millimeters.
The utility model discloses when using, at first open oil mist generating system and draught fan 17, the oil mist that makes vacuum pump 12 compress out through air-vent valve 3, mass flow controller 5 and glass rotameter 8's regulation mixes with the air with certain proportion, through the pollutant velocity of flow in the 18 control mixing regions of converter, detects even low concentration oil mist when dust detector 20, and maintains stably in 5 minutes and can think that oil is even this moment sent out. Starting an oil mist sampling system, and completing the following two steps before the virtual impactor 16 is connected to a sampling position: 1. weighing the cylindrical electrostatic sampler 15 attached with the aluminum foil paper by using an electronic balance; 2. the glass rotameter 8 and the vacuum pump 12 were adjusted to control the flow ratio of the two outlets of the primary and secondary flows of the virtual impactor 16 at 9: 1. At this time, the oil mist sampling system is started, the system is closed after 20min, the cylindrical electrostatic sampler 15 is taken down and weighed, and the Tenax adsorption tube 22 is refrigerated and stored. The ratio of the mass difference of the cylindrical electrostatic sampler 15 to the oil mist concentration measured by the dust detector is the separation efficiency, and the Tenax adsorption tube 15 after thermal desorption can be further analyzed by using a gas chromatography method to research the volatile components in the oil mist.
The present invention discloses and proposes an oil mist sampling system based on CFD simulation, which can be realized by those skilled in the art by referring to the contents of the text and appropriately changing the conditions, although the method and the preparation technique of the present invention have been described by the preferred embodiment, it is obvious that those skilled in the art can change or recombine the method and the technical route described herein without departing from the contents, spirit and scope of the present invention to realize the final preparation technique. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and content of the invention.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022087868.3U CN212483066U (en) | 2020-09-22 | 2020-09-22 | An Oil Mist Sampling System Based on CFD Simulation |
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| CN202022087868.3U CN212483066U (en) | 2020-09-22 | 2020-09-22 | An Oil Mist Sampling System Based on CFD Simulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014168A (en) * | 2020-09-22 | 2020-12-01 | 天津大学 | Oil mist sampling system based on CFD simulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112014168A (en) * | 2020-09-22 | 2020-12-01 | 天津大学 | Oil mist sampling system based on CFD simulation |
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Granted publication date: 20210205 |