CN202119689U - Quasi constant weight weighing device for monitoring mass concentration of atmospheric particulate matter in oscillation balance method - Google Patents
Quasi constant weight weighing device for monitoring mass concentration of atmospheric particulate matter in oscillation balance method Download PDFInfo
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- CN202119689U CN202119689U CN2011201842051U CN201120184205U CN202119689U CN 202119689 U CN202119689 U CN 202119689U CN 2011201842051 U CN2011201842051 U CN 2011201842051U CN 201120184205 U CN201120184205 U CN 201120184205U CN 202119689 U CN202119689 U CN 202119689U
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Abstract
The utility model discloses a quasi constant weight weighing device for monitoring mass concentration of atmospheric particulate matter in an oscillation balance method. A three-way pipe, an electric ball valve and a particular filer are connected between a conveying pipe of a sample to be tested and a heating pipe of the sample to be tested of an existing particular matter concentration monitoring instrument in the oscillation balance method . An original process of continuous conveying of the sample to be tested to a filter membrane weighing portion is changed into an intermittent type. According to specified period, processes of filter membrane intercepting particular matter of the sample to be tested and filter membrane constant weight are conducted. The quasi constant weight weighing device can determinate concentration of the particular matter with a filter membrane constant weight weighing process through the particular matter concentration monitoring instrument in the oscillation balance method, effectively solves comparability to the standard gravimetric method, obtains equivalent monitoring effects to the standard gravimetric method required for filter membrane constant weight, and is particularly suitable for conditions with large relative humidity such as rain, fog, hot and wet weather and the like.
Description
Technical field
The utility model relates to the test and analysis technology field, particularly in the monitoring of Atmospheric particulates mass concentration, adopts and shakes the accurate constant weight weighing device that sedimentation balance method is carried out.
Background technology
At present, in order to tackle, to solve because the problem of environmental pollution that commercial production and human settlements life style are caused especially endangers serious grey haze problem, need carry out continuously the Atmospheric particulates mass concentration, accurately, monitoring widely; Thereby spread all over the world, enormous amount, system complex environment air automatic monitor station point, all the Atmospheric particulates mass concentration as main monitoring project.
Different with gas composition analysis, the Atmospheric particulates mass concentration equals by the ratio of the gross mass of all on-gaseous, non-fluent meterial in the collected specimens with sample standard state volume.The standard method of carrying out the monitoring of Atmospheric particulates mass concentration is a gravimetric method; With the filter membrane that can intercept and capture particle; Before the sampling constant temperature (drying) balance room through placement reach constant weight after scale get its initial mass; Accurate observing and controlling sampling flow of sampling process and time---bulk registration standard for manual sampling state volume; Get back to constant temperature (drying) balance room after the sampling and reach after the constant weight scale and get it and intercept and capture quality through placing, with initial mass, intercept and capture quality, standard for manual sampling state volumescope is calculated the monitoring result of particle concentration.
The standard weights method of above-mentioned particle concentration monitoring has the operating process of weighing after the placement of constant temperature (drying) balance room reaches constant weight; Intercepted and captured the vaporisable matter on filter membrane in sampling process---the moisture as particle adheres to, in the constant weight process, (dried) removal, it calculates the gained monitoring result and is actually " doing " particle concentration.Therefore, can make misty rain, hectic fever weather sampling monitoring result and the equivalence of sunny weather---promptly can not receive the influence of relative humidity of atomsphere level when sampling.
Existing concussion sedimentation balance method Atmospheric particulates mass concentration automatic monitor, is made into weighing sample air communication and crosses particle filter membrane quality analytical balance, promptly alleged concussion balance as mass sensor with quartzy concussion element.Can weighing go out filter membrane in very short time the small mass accumulation data at interval, and according to the sample air flow rate in the same time interval totally, calculate corresponding particle concentration; Quantitatively equation is following for the typical case:
In the formula: f---concussion balance concussion frequency (Hz), M---quality of loads (g), K
0---the elastic load ratio., remove wherein particle and keep dynamics such as flow, thermodynamics index identical as the filter membrane of standard test weight by known quality, have and carry under the condition that zero entraining air stream passes through, shake the balance metering to transmit and check, can calculate, confirm K in filtration
0Numerical value.
In the formula: dM---accumulation quality of loads (g), K
0---elastic load ratio, f
1---accumulation finishes concussion balance frequency (Hz), f
0---accumulation begins to shake balance frequency (Hz).
In the formula: C---particle concentration (g/m
3), dM---accumulation quality of loads (g), V---accumulative total sample volume (m
3Standard state), F---sample flow (m
3Standard state/s), t---accumulated time (s).
The influence that can receive working temperature owing to the concussion frequency of above-mentioned concussion balance produces drift; So must avoid the variation of gaseous sample temperature (being the weather temperature); Make the degree of stability of concussion balance working temperature, can not reach requirement the accurate weighing of filter membrane quality.So practical concussion sedimentation balance method particle concentration monitoring instrument all can have custom-designed heating, heat preservation component and structure, ensure the concussion balance in the sample air-flow, its working temperature can keep constant (more common is 50 degrees centigrade).In addition; Because the sample air-flow passes through filter membrane continuously; The quality load of concussion balance is the result of stress balance, thereby makes dynamics indexs such as sample pressure, flow velocity keep enough degrees of stability, also is the key conditional request of concussion sedimentation balance method instrument detecting particle concentration.
Concussion sedimentation balance method particle concentration monitoring instrument is when operation, and according to the time interval of setting (for example 2 seconds), constantly the frequency with its last quartz concussion element of measuring with up-to-date mensuration is f
1And f
0, calculate up-to-date gaseous sample particle concentration, realize continuous monitoring to the Atmospheric particulates mass concentration.
As shown in Figure 1; Filter membrane sampling and weighing organigram partly for existing concussion sedimentation balance method particle concentration monitoring instrument; Its working method is: provide suction aerodynamic force and sample flow controller 2 to limit the sample air flow rate by aspiration pump 1; From the sample of sample collecting apparatus 3 acquisition target flows (for example 1L/min), sample collecting apparatus 3 also has the particle diameter cutting action usually, and particle diameter is greater than the particle of designated value (for example 10 microns) in the separation removal sample.Get into sample heating tube 5 through sample delivery pipe 4 then, when flowing through sample heating tube 5, be heated to assigned temperature, make quartzy concussion element working temperature can not satisfy stability requirement to avoid sample temperature to change.Sample flows through filter membrane weighing portion 6 then; Flow out through sample flow controller 2 and aspiration pump 1; Particle in the sample air-flow is intercepted and captured on filter membrane therebetween, and the filter membrane quality is increased, and causes that the concussion balance is because of the corresponding decline of quality load rising frequency.Continuously import in the process of samples this to filter membrane weighing portion 6; Quote above-mentioned concussion sedimentation balance method particle concentration quantitative relationship; Can according to the fixed time at interval in the concussion balance beginning with finish frequency, and sample flow accumulative total etc. calculates tested gas particles substrate concentration.
But,, lacked the operating process of " weighing after the placement of constant temperature (drying) balance room reaches constant weight " with the standard weights method comparison of Atmospheric particulates mass concentration monitoring, above-mentioned concussion sedimentation balance method Atmospheric particulates mass concentration automatic monitor.Make in sampling process and intercepted and captured on filter membrane; Transpirable material---the moisture that adheres to like particle; Can receive " baking " effect that (being provided with for preventing the drift of quartzy concussion element frequency) is higher than the filter membrane weighing mechanism temperature of temperature; Evaporation causes the interference that its accumulation quality of loads is measured gradually, causes particle concentration Monitoring Data error; Especially in high situation of relative humidity of atomsphere level such as misty rain, hectic fever weather, tend to occur the abnormal data that particle concentration is lower than 0 (negative value).
Existing concussion sedimentation balance method particle concentration monitoring instrument, its textural can't accomplishing with filter membrane constant weight (oven dry) back weighing.Because constant weight just must stop sampling; And if do not had the sample flow; Concussion balance quality of loads can change because of the change of dynamics indexs such as gas-flow resistance disappearance; Its working temperature also can cause serious concussion balance frequency drift phenomenon because of absence of convection changes, and detects so that can not normally carry out particle concentration.
Summary of the invention
To the above defective of the prior art; In order to make the equivalent standard weights method with filter membrane constant weight operating process of monitoring result ability of concussion sedimentation balance method particle concentration monitoring instrument, the utility model provides a kind of accurate constant weight weighing device that shakes the monitoring of sedimentation balance method Atmospheric particulates mass concentration.
The technical scheme that the utility model adopted: a kind of accurate constant weight weighing device that shakes the monitoring of sedimentation balance method Atmospheric particulates mass concentration; Comprise aspiration pump, sample flow controller, sample collecting apparatus, sample delivery pipe, sample heating tube and filter membrane weighing portion; Said aspiration pump is connected with the output terminal of sample flow controller with filter membrane weighing portion; Said sample heating tube is connected with the input end of filter membrane weighing portion; Also be connected with three-way pipe, electrical ball valve and particulate filter between said sample delivery pipe and the sample heating tube; Said harvester is connected through the input end of sample delivery pipe with first three-way pipe; Two output terminals of first three-way pipe are connected with the input end of second three-way pipe through electrical ball valve, particulate filter respectively, and the output terminal of second three-way pipe is connected with the sample heating tube.
The output terminal of above-mentioned sample collecting apparatus also is connected with traffic separator; The primary air pipeline of said traffic separator is connected with the sample delivery pipe, and another branch road of said traffic separator is connected through auxiliary flow controller in bypass gas flow pipeline and the sample flow controller.Said sample delivery pipe is connected with sample heating tube, filter membrane weighing portion through first three-way pipe, electrical ball valve, second three-way pipe, and said filter membrane weighing portion is connected with main trafficdirector in the sample flow controller through airflow pipeline.Said main trafficdirector is connected with aspiration pump through airflow pipeline with the auxiliary flow controller.
Also be provided with particle cutter (having the particle diameter cutting action) in the above-mentioned sample collecting apparatus, be used for separating the particle of removal sample particle diameter greater than designated value.
Above-mentioned electrical ball valve is to be used for electronic or the pneumatic or servocontrol valve that surges that fluid circuit is opened and closed.
Based on above-mentioned accurate constant weight weighing device, the utility model provides a kind of accurate constant weight weighing method of shaking the monitoring of sedimentation balance method Atmospheric particulates mass concentration simultaneously, may further comprise the steps:
(1) by aspiration pump the suction aerodynamic force is provided, and limits the sample air flow rate through the sample flow controller;
(2) obtain the sample of target flow from sample collecting apparatus;
(3) open electrical ball valve, close filtrator, make sample flow through electrical ball valve and sample heating tube through the sample delivery pipe, input filter membrane weighing portion flows out through sample flow controller and aspiration pump, intercepts and captures the sample particle at filter membrane;
(4) close electrical ball valve, open filtrator, make sample flow through filtrator through the sample delivery pipe; Remove the particle in the sample; With the sample that is removed particle as zero gas through the sample heating tube, input filter membrane weighing portion is through sample flow controller and aspiration pump outflow; Make filter membrane and go up particle to reach constant weight, and obtain the quality of loads and the frequency thereof of the concussion balance after constant weight is stablized;
(5) according to forward and backward adjacent twice filter membrane and go up the constant weight process of particle; The frequency of concussion balance after the filter membrane constant weight that obtains; And between twice filter membrane constant weight process; Filter membrane is intercepted and captured the sample flux cumulating of sample particle process, according to the quantitative relationship of concussion sedimentation balance method particle concentration, calculates the particle concentration of sample.
The computing formula of the particle concentration of sample is in the above-mentioned steps (5): in
formula: C---particle concentration; DM---accumulation quality of loads; V---accumulative total sample volume; F---sample flow, t---accumulated time.
The computing formula of above-mentioned accumulation quality of loads is:
In the formula: dM---accumulation quality of loads, K
0---elastic load ratio, f
1---accumulation finishes concussion balance frequency, f
0---accumulation begins to shake the balance frequency.
The accurate constant weight weighing device of the described concussion sedimentation balance method of the utility model Atmospheric particulates mass concentration monitoring; Can realize having the particle concentration mensuration of filter membrane constant weight weighing flow process with concussion sedimentation balance method particle concentration monitoring instrument; Solved comparability effectively with the standard weights method; Obtain and require the monitoring result of the standard weights method equivalence of filter membrane constant weight, be specially adapted under the bigger situation of misty rain, hectic fever weather equal relative humidity.In addition, it is simple that observing and controlling operation of the utility model and data are obtained flow process, is convenient to carry out analytical calculation.
Description of drawings
Fig. 1 is the structural representation of existing concussion sedimentation balance method particle concentration monitoring instrument;
Fig. 2 is the structural representation of the accurate constant weight weighing device of the said concussion sedimentation balance method of the utility model Atmospheric particulates mass concentration monitoring;
Fig. 3 is the structural drawing of wherein a kind of embodiment of the said accurate constant weight weighing device of the utility model.
Wherein: 1, aspiration pump; 2, sample flow controller; 3, sample collecting apparatus; 4, sample delivery pipe; 5, sample heating tube; 6, filter membrane weighing portion; 7, first three-way pipe; 8, electrical ball valve; 9, particulate filter; 10, second three-way pipe; 11, traffic separator; 12, bypass gas flow pipeline, 13, airflow pipeline; 14, filtrator; 21, main trafficdirector; 22, auxiliary flow controller.
Embodiment
As shown in Figure 2; For implementing above-mentioned accurate constant weight weighing method; The utility model inserts first three-way pipe 7, electrical ball valve 8, particulate filter 9 and second three-way pipe 10 between the sample delivery pipe 4 and sample heating tube 5 of existing concussion sedimentation balance method particle concentration monitoring instrument.
The working method of said accurate constant weight weighing device is: provide suction aerodynamic force and sample flow controller 2 to limit the sample air flow rate by aspiration pump 1; Obtain the sample of target flow (for example 1L/min) from sample collecting apparatus 3; Usually sample collecting apparatus 3 also has the particle diameter cutting action, and particle diameter is greater than the particle of designated value (for example 10 microns) in the separation removal sample.After this will be original continuously to the process of filter membrane weighing portion 6 input samples, change into steply, according to the cycle of appointment, carry out filter membrane respectively and intercept and capture sample particle process and filter membrane constant weight process, specific as follows:
Intercept and capture sample particle process at filter membrane; Electrical ball valve 8 is open-minded; Particulate filter 9 is closed, and makes sample only flow through first three-way pipe 7, electrical ball valve 8 and second three-way pipe 10, and sample heating tube 5; Input filter membrane weighing portion 6 flows out through sample flow controller 2 and aspiration pump 1.Particle in the sample air-flow is intercepted and captured on filter membrane during this period, and the filter membrane quality is increased, and causes that concussion balance quality of loads rises and frequency decline.
In filter membrane constant weight process; Electrical ball valve 8 is closed, and particulate filter 9 is open-minded, makes sample only flow through first three-way pipe 7, particulate filter 9 and second three-way pipe 10; Remove particle in the sample; With the sample that is removed particle as zero gas through sample heating tube 5, input filter membrane weighing portion 6---make its dynamics, thermodynamics index keep meeting the requirement of measuring the accumulation quality of loads, flow out through sample flow controller 2 and aspiration pump 1.Volatile substances such as the moisture on the filter membrane is evaporated to and conditional equilibriums such as the temperature of filter membrane weighing portion 6, humidity during this period, makes filter membrane reach constant weight gradually, thereby obtains stable concussion balance quality of loads and frequency thereof after the filter membrane constant weight.
Thus can be according to forward and backward adjacent twice filter membrane constant weight process, concussion balance frequency after the filter membrane constant weight of acquisition is as f
0With f
1And between this twice filter membrane constant weight process; Filter membrane is intercepted and captured the sample flux cumulating of sample particle process etc.; According to concussion sedimentation balance method particle concentration quantitative relationship, calculate and have filter membrane constant weight flow process, " doing " particle concentration of sample.Because mode, the condition of this constant weight are different with the standard weights method, be letting zero gas implement through the form of filter membrane, therefore, in the utility model with its definition weight weighing device that is as the criterion.
In Fig. 2, that electrical ball valve 8 comprises is electronic, pneumatic, surge etc. is used for the servocontrol valve that fluid circuit is opened and closed, and path material, shape are according to 4 requirements of sample delivery pipe.The air communication of particulate filter 9 is crossed resistance, need be lower than (because of indexs such as fluidised form, flow velocity, pressure change) and make the limit that the concussion balance can not Correct Determination accumulation quality of loads; The gas-flow resistance of gas-flow resistance when particulate filter 9 is opened when electrical ball valve 8 is opened then can not disposed closing function and the fixing opening state that keeps.
The utility model is specially adapted to influenced under the bigger environment by amblent air temperature in particle concentration Monitoring Data errors such as misty rain, hectic fever; As shown in Figure 3; Be the concussion sedimentation balance method Atmospheric particulates quality and concentration monitor device that utilizes wherein, carry out improved a kind of specific embodiment according to the utility model.In this embodiment; Sample collecting apparatus 3 (comprising the particle cutter with particle diameter cutting action) is connected with sample delivery pipe 4 through the primary air pipeline of traffic separator 11; Be connected with sample heating tube 5, filter membrane weighing portion 6 through first three-way pipe 7, electrical ball valve 8, second three-way pipe 10 then; Said filter membrane weighing portion 6 is connected with main trafficdirector 21 in the sample flow controller 2 through airflow pipeline 13; Also be provided with another branch road between said first three-way pipe 7 and second three-way pipe 10, be connected to particulate filter 9 (being used for removing the sample particle) on this branch road.Another branch road of said traffic separator 11 is connected with auxiliary flow controller 22 in the sample flow controller 2 through bypass gas flow pipeline 12, airflow pipeline 13, filtrator 14.At last; Said main trafficdirector 21 is connected with aspiration pump 1 (vacuum pump) through airflow pipeline 13 with auxiliary flow controller 22; The sample air flow rate that utilizes suction aerodynamic force that aspiration pump 1 provides and sample flow controller 2 to limit obtains the sample of target flows from sample collecting apparatus 3.
To the lower environment of particle concentration; Its workflow adopts: the mensuration cycle is 30 minutes (2 particle concentration Monitoring Data of generation in per 1 hour); Wherein, filter membrane constant weight process time is 10 minutes, and it is 20 minutes that filter membrane is intercepted and captured sample particle process time.
The said filter membrane constant weight of the utility model must be carried out under the sample states stopping, and the essence effect is that the particle of intercepting and capturing on the requirement filter membrane no longer continues to increase.If when needs carry out the filter membrane constant weight, can accomplish only the particle in the sample air-flow to be removed---become zero gas, keep flow unchanged.Just can satisfy simultaneously: particle no longer increases on the filter membrane, and keeps relevant dynamics, the thermodynamics index of concussion capacity of balance filter membrane to meet the requirement of measuring the accumulation quality of loads.Thereby realize, continue to use the function and the quantitative relationship of concussion sedimentation balance method particle concentration monitoring instrument, measuring f
0And f
1The concussion balance frequency of Shi Caiyong after the filtering membrane constant weight, the count particles substrate concentration obtains and requires the monitoring result of the standard weights method equivalence of filter membrane constant weight.
Claims (6)
1. one kind shakes the accurate constant weight weighing device that sedimentation balance method Atmospheric particulates mass concentration is monitored; Comprise aspiration pump (1), sample flow controller (2), sample collecting apparatus (3), sample delivery pipe (4), sample heating tube (5) and filter membrane weighing portion (6); Said aspiration pump (1) is connected with the output terminal of sample flow controller (2) with filter membrane weighing portion (6); Said sample heating tube (5) is connected with the input end of filter membrane weighing portion (6); It is characterized in that; Also be connected with three-way pipe (7,10), electrical ball valve (8) and particulate filter (9) between said sample delivery pipe (4) and the sample heating tube (5); Said harvester (3) is connected through the input end of sample delivery pipe (4) with first three-way pipe (7), and two output terminals of first three-way pipe (7) are connected with the input end of second three-way pipe (10) through electrical ball valve (8), particulate filter (9) respectively, and the output terminal of second three-way pipe (10) is connected with sample heating tube (5).
2. the accurate constant weight weighing device of monitoring according to the said concussion sedimentation balance method of claim 1 Atmospheric particulates mass concentration; It is characterized in that; The output terminal of said sample collecting apparatus (3) also is connected with traffic separator (11); The primary air pipeline of said traffic separator is connected with sample delivery pipe (4), and another branch road of said traffic separator (11) is connected through auxiliary flow controller (22) in bypass gas flow pipeline (12) and the sample flow controller.
3. the accurate constant weight weighing device of monitoring according to the said concussion sedimentation balance method of claim 2 Atmospheric particulates mass concentration; It is characterized in that; Said sample delivery pipe (4) is connected with sample heating tube (5), filter membrane weighing portion (6) through first three-way pipe (7), electrical ball valve (8), second three-way pipe (10), and said filter membrane weighing portion is connected with main trafficdirector (21) in the sample flow controller through airflow pipeline.
4. according to the accurate constant weight weighing device of the said concussion sedimentation balance method of claim 3 Atmospheric particulates mass concentration monitoring, it is characterized in that said main trafficdirector (21) is connected with aspiration pump (1) through airflow pipeline with auxiliary flow controller (22).
5. the accurate constant weight weighing device of monitoring according to the said concussion sedimentation balance method of arbitrary claim Atmospheric particulates mass concentration in the claim 1 to 4; It is characterized in that; Said sample collecting apparatus also is provided with the particle cutter in (3), is used for separating the particle of removal sample particle diameter greater than designated value.
6. according to the accurate constant weight weighing device of the said concussion sedimentation balance method of claim 1 Atmospheric particulates mass concentration monitoring, it is characterized in that said electrical ball valve (8) is for being used for electronic or the pneumatic or servocontrol valve that surges that fluid circuit is opened and closed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201842051U CN202119689U (en) | 2011-06-02 | 2011-06-02 | Quasi constant weight weighing device for monitoring mass concentration of atmospheric particulate matter in oscillation balance method |
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|---|---|---|---|
| CN2011201842051U CN202119689U (en) | 2011-06-02 | 2011-06-02 | Quasi constant weight weighing device for monitoring mass concentration of atmospheric particulate matter in oscillation balance method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252930A (en) * | 2011-06-02 | 2011-11-23 | 广东省环境监测中心 | Quasi constant weight weighing apparatus and method for monitoring mass concentration of atmospheric particulates by utilizing oscillation balance method |
| CN102830032A (en) * | 2012-08-23 | 2012-12-19 | 武汉市天虹仪表有限责任公司 | Method and apparatus of compensating aerosol measure error of oscillating microbalance method by using dual channels |
| CN104132863A (en) * | 2014-08-15 | 2014-11-05 | 武汉市天虹仪表有限责任公司 | Continuous monitoring device and continuous monitoring method for particulate matters |
| CN112649336A (en) * | 2020-12-15 | 2021-04-13 | 北京雪迪龙科技股份有限公司 | Humidity interference removing method |
| CN113586296A (en) * | 2021-09-01 | 2021-11-02 | 潍柴动力股份有限公司 | Method and device for predicting residual life of air filter and storage medium |
-
2011
- 2011-06-02 CN CN2011201842051U patent/CN202119689U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252930A (en) * | 2011-06-02 | 2011-11-23 | 广东省环境监测中心 | Quasi constant weight weighing apparatus and method for monitoring mass concentration of atmospheric particulates by utilizing oscillation balance method |
| CN102830032A (en) * | 2012-08-23 | 2012-12-19 | 武汉市天虹仪表有限责任公司 | Method and apparatus of compensating aerosol measure error of oscillating microbalance method by using dual channels |
| CN104132863A (en) * | 2014-08-15 | 2014-11-05 | 武汉市天虹仪表有限责任公司 | Continuous monitoring device and continuous monitoring method for particulate matters |
| CN112649336A (en) * | 2020-12-15 | 2021-04-13 | 北京雪迪龙科技股份有限公司 | Humidity interference removing method |
| CN113586296A (en) * | 2021-09-01 | 2021-11-02 | 潍柴动力股份有限公司 | Method and device for predicting residual life of air filter and storage medium |
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