CN102095762B - Oil fume data acquisition method - Google Patents
Oil fume data acquisition method Download PDFInfo
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- CN102095762B CN102095762B CN2010105293212A CN201010529321A CN102095762B CN 102095762 B CN102095762 B CN 102095762B CN 2010105293212 A CN2010105293212 A CN 2010105293212A CN 201010529321 A CN201010529321 A CN 201010529321A CN 102095762 B CN102095762 B CN 102095762B
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Abstract
The invention provides an oil fume data acquisition method which comprises the following steps of selecting sensor assemblies, covering and protecting, installing and fixing, sampling and analyzing, calculating and comparing, outputting results and the like. Time spent on measuring oil fume concentrations once is less than one minute, manual operation is not required, measurement is automatically carried out, and quantitive and accurate oil fume concentration values can be simply and visually obtained. Equipment of the invention can be fixedly installed on oil fume discharge sites so as to carry out long-time, real-time and online detection on the oil fume concentrations and automatically report, therefore, the monitoring quality and efficiency are effectively improved. Through the method provided by the invention, the overall manufacture cost is lower, the running and maintenance cost is lower, and labor demand and work intensity are greatly lowered. The method is suitable for detecting various oil fume concentrations.
Description
Technical field
The present invention relates to a kind of oil smoke collecting method, particularly a kind of oil smoke concentration online acquisition method.
Background technology
Oil smoke is meant grease, organic matter and heating and decomposition thereof or the pyrolysis product that volatilizees in food cooking, the process.During the cooking; Edible oil and food are under hot conditions, and a large amount of thermal oxide decomposition products of generation mainly are made up of fine particle and gaseous material (volatility and half volatile organic compound); Wherein partially decomposed product is dispersed in the air with the smog form, forms oil smoke.When temperature reaches the smoke point of edible oil, promptly 170 ℃ the time, the blue smoke mist that the initial stage decomposes can appear; Along with the lasting rising of temperature, the decomposition rate of oil smoke is accelerated, when temperature reaches 250 ℃; A large amount of oil smoke will occur, and with pungent smell, this type of material is referred to as pollutants from cooking fume.
Pollutants from cooking fume composition more complicated; Existing grease, protein and raw material etc. carry out organic flue gas of physics, chemical reaction generation under heating condition; Also have in the heating operation process; Oil plant, material drop spatter the macromolecular compound that splits institute's decomposition, oxidation, polymerization, mix with combustion product gases again, form gaseous state, liquid state and three types of solid-state pollutions.Research shows that oil smoke gas is formed compound and had kind more than 300 at least, wherein contains multiple hazardous compound.Mainly contain fatty acid, alkane, alkene, aldehyde, ketone, alcohol, ester, aromatic and heterogeneous ring compound etc. in the oil smoke, specifically the difference with cooking oil kind, operating conditions, the scale of operation and the operating temperature etc. selected for use has very big-difference.In addition, kitchen fuel also can produce a large amount of harmful gases when burning or rough burning, like CO, CO
2, NOX, SO
2And particle etc.
Standard GB 18483-2001, promptly the cooking fume emission standard has been stipulated the spot sampling method and the lab analysis metering method of oil smoke, and wherein lab analysis metering method adopts infrared spectrophotometer, and the content of oil smoke is respectively 2930cm by wave number
-1(CH
2The stretching vibration of c h bond in the group), 2960cm
-1(CH
3The stretching vibration of c h bond in the group) and 3030cm
-1The absorbance A at (stretching vibration of c h bond in the aromatic rings) bands of a spectrum place
2930, A
2960, A
3030Calculate.The method makes that a measuring period is longer relatively because whole measuring process comprises spot sampling and lab analysis, and artificial input is bigger, and is high to the requirement of personnel and equipment, thereby can not realize continuous coverage, also can't accomplish real time and on line monitoring.
Though more existing in the market oil smoke concentration measurement mechanisms; But these devices are not to be fixedly mounted on the oil smoke discharge scene, but move to the scene when needed, remove after sampling and the measurement; Need manually-operated and change parts; Can not long-time continuous measure, and these installation costs are high, are difficult to large scale application.In addition, the system and the product of oil smoke on-line monitoring arranged also on the market, but all can not directly measure oil smoke concentration, more can not obtain oil smoke concentration accurately.So on the present market not for a long time real-time online accurately measure the method and the product of oil smoke concentration.
Summary of the invention
The purpose of this invention is to provide a kind of oil smoke concentration online acquisition method, little to reach investment, cost is low, solves the real time and on line monitoring problem of oil smoke concentration.
The technical scheme that the present invention adopted is: may further comprise the steps:
(1), select sensor module, comprise more than one sensor in the sensor module, sensor module is operated according to following steps under given conditions:
A, choose edible oil, under the some different heating temperature between 100 ℃-1000 ℃, generate the oil smoke of variable concentrations;
B, the oil smoke that generates is carried out sample collecting, obtain one group of sample oil smoke with the method for standard GB 18483-2001 regulation;
C, selected one of them sensor module are measured the sample oil smoke that obtains, and are obtained one group of sensor measurement data;
D, the sample oil smoke to gathering among the step b are measured with the method for standard GB 18483-2001 regulation, obtain one group of GB measurement data;
E, the data that step c and steps d are obtained contrast one by one, adopt the relation between data fitting method analyte sensors measurement data and the GB measurement data, confirm corresponding matched curve and error of fitting;
F, replacing different sensor assembly, repeat above-mentioned a---five steps of e, accumulative total draws the matched curve and the error of fitting of different sensors assembly, sets up corresponding quantitative relationship chart;
The matched curve of g, each sensor module of comparison and error of fitting are selected the wherein minimum sensor module of error of fitting;
H, sensor module that error of fitting is minimum repeat above a in bigger oil smoke concentration scope---seven steps of g, to confirm measurement range and measuring error, finally confirm the right sensors assembly.
(2), each sensor in the sensor module is carried out covering protection with filtration membrane;
(3), sensor module is fixed in the oil smoke discharge pipeline;
(4), each sensor in the sensor module is according to the different of type and combine self principle of work, and oil smoke is carried out sampling analysis, and converts analysis result into voltage signal or current signal output;
(5), output signal that will receive and the quantitative relationship chart of setting up in advance compare and calculate, and then draw the oil smoke concentration value.
Further step of the present invention is: in above-mentioned steps (1); Its sensor is gas sensor or temperature sensor or humidity sensor; Each sensor can be measured one or more gases, can also comprise the sensor of measurement gas temperature and the sensor of measurement gas humidity in the combination of a plurality of sensors; The aperture of the filtration membrane in the above-mentioned steps (2) is at 1 μ m---between the 2mm; The main effect of filtration membrane is the pollutant that stops in the oil smoke; Particularly particle contacts and clogging sensor, thereby has prolonged the life-span of sensor, makes the present invention have practical feasibility.Because sensor can't exert an influence to measurement result so filter out other pollutant only to gas sensitization.
Sensor module couples together through wireless or wired mode and display device, with the oil smoke on-line monitoring software platform that the result uploads to environmental administration, realizes monitoring in real time.
Through such design, the present invention compared with prior art has following obvious improvement and outstanding characteristics:
1---the present invention adopts sensor technology that oil smoke is directly measured; Can obtain quantizing, oil smoke concentration value accurately; And each sensor all carried out covering protection with filtration membrane, and effectively prolonging the serviceable life of sensor, the present invention accomplished time that oil smoke concentration measures less than 1 minute; Need not manually-operated, measure automatically.The GB18483-2001 of national standard then needs manually-operated, and labour intensity is big, and measuring period is long, and can not continuous coverage.
2---the present invention can be fixedly mounted on the oil smoke discharge scene, and long-time real-time online detects oil smoke concentration, reports automatically; Quality monitoring and efficient have effectively been improved; The overall manufacturing cost of the present invention is lower, and operation maintenance cost is very low, greatly reduces artificial demand and labour intensity.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is overall workflow figure of the present invention;
Fig. 2 is the structure scheme of installation of embodiment;
Fig. 3 is the overall workflow figure of embodiment.
Among the figure, 1, the oil smoke discharge pipeline, 2, filtration membrane, 3, sensor module, 4, probe.
Embodiment
Extremely shown in Figure 3 in conjunction with Fig. 1; Choose sensor module 3; Form by three sensors of various types in the sensor module 3; Be respectively the TGS2602 type gas sensor that is used for measure gas concentrations, measure the LM35 type temperature sensor of temperature, and the HS1101 type humidity sensor of humidity measuring.Further explanation is, TGS2602 type gas sensor is mainly used in the VOC of surveying in the oil smoke (VOC), and this gas sensor comprises sensing element and heater block.Wherein sensing element adopts metal oxide materials to process, heater block rated operational voltage (+5VDC) can sensing element be heated to certain temperature down, generally at 300 ℃-500 ℃.At such high temperature and under the situation of oxygen as medium; Sensing element and gas generation oxidation; Sensing element loses oxygen, and the resistance value of fax sense parts changes, and the relation of definite logarithmic curve is arranged between the concentration of resistance value and gas; Through the resistance value of survey sensor, just can calculate the concentration of this gas.
It is that the filtration membrane 2 of 2 μ m carries out covering protection that these three sensors are used the aperture respectively, and main effect is the pollutant that stops in the oil smoke, particularly particle contact and stop up each sensor, thus prolonged the life-span of sensor.
Each sensor is debugged and self check, turned back to then when breaking down that assembling process reexamines or emat sensor more, smoothly through again sensor module 3 being installed and fixed the initialization of switching in 4 of popping one's head in after debugging and the self check; Under normal condition (like temperature is 25 ℃, and humidity is 60%), the probe that sensor module 3 is installed 4 is placed air; The aerial resistance value of measurement gas sensor; Write down this resistance value R0, and then will pop one's head in 4 be installed to oil smoke discharge pipeline 1 inside, the resistance value R1 of measurement gas sensor; Pass through the temperature and humidity of temperature sensor and humidity sensor measurement oil smoke simultaneously; Because measurement result and the temperature and humidity of gas sensor have definite relation,, resistance value R1 is converted the resistance value R2 under the normal condition (being that temperature is that 25 ℃, humidity are 60%) so need carry out the compensation correction of temperature and humidity to the resistance value R1 that surveys; Calculate R2/R0; The ratio that R2/R0 draws is the characteristic parameter of sensor, is exactly the measurement result of sensor
Converting the measurement result of this sensor into voltage signal again compares and calculates with the quantitative relationship chart of setting up in advance; (measurement result that promptly obtains in the experimental technique according to aforesaid selection sensor and the relation between the oil smoke concentration; Calculate oil smoke concentration) at last through wireless telecommunications with this oil smoke concentration result transmission to the computing machine of law enforcement for environmental protection department; The law enfrocement official gets final product the blowdown situation of real-time acquisition units concerned, and handles according to the blowdown situation.
Above content is the further explain that combines concrete main embodiment to do; Can not assert that practical implementation of the present invention is confined to these explanations; Those skilled in the art are under the prerequisite that does not break away from the present invention's design; Some other technology of done accurately, the deduction or replace that beautify, all should belong to protection scope of the present invention.
Claims (3)
1. oil smoke collecting method is characterized in that may further comprise the steps:
(1), select sensor module, comprise more than one sensor in the sensor module, sensor module is operated according to following steps under given conditions:
A, choose edible oil, under the some different heating temperature between 100 ℃-1000 ℃, generate the oil smoke of variable concentrations;
B, the oil smoke that generates is carried out sample collecting, obtain one group of sample oil smoke with the method for standard GB 18483-2001 regulation;
C, selected one of them sensor module are measured the sample oil smoke that obtains, and are obtained one group of sensor measurement data;
D, the sample oil smoke to gathering among the step b are measured with the method for standard GB 18483-2001 regulation, obtain one group of GB measurement data;
E, the data that step c and steps d are obtained contrast one by one, adopt the relation between data fitting method analyte sensors measurement data and the GB measurement data, confirm corresponding matched curve and error of fitting;
F, replacing different sensor assembly, repeat above-mentioned a---five steps of e, accumulative total draws the matched curve and the error of fitting of different sensors assembly, sets up corresponding quantitative relationship chart;
The matched curve of g, each sensor module of comparison and error of fitting are selected the wherein minimum sensor module of error of fitting;
H, sensor module that error of fitting is minimum repeat above a in bigger oil smoke concentration scope---seven steps of g, to confirm measurement range and measuring error, finally confirm the right sensors assembly;
(2), each sensor in the sensor module is carried out covering protection with filtration membrane;
(3), sensor module is fixed in the oil smoke discharge pipeline;
(4), each sensor in the sensor module is according to the different of type and combine self principle of work, and oil smoke is carried out sampling analysis, and converts analysis result into voltage signal or current signal output;
(5), output signal that will receive and the quantitative relationship chart of setting up in advance compare and calculate, and then draw the oil smoke concentration value.
2. oil smoke collecting method according to claim 1 is characterized in that: the sensor in the above-mentioned steps (1) is gas sensor or temperature sensor or humidity sensor.
3. oil smoke collecting method according to claim 1 is characterized in that: the aperture of the filtration membrane in the above-mentioned steps (2) is at 1 μ m---between the 2mm.
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|---|---|---|---|
| CN2010105293212A CN102095762B (en) | 2010-10-29 | 2010-10-29 | Oil fume data acquisition method |
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|---|---|---|---|
| CN2010105293212A CN102095762B (en) | 2010-10-29 | 2010-10-29 | Oil fume data acquisition method |
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| CN107290493B (en) * | 2017-05-26 | 2019-06-14 | 广东美的厨房电器制造有限公司 | A kind of smoke exhaust ventilator and the method for detecting oil quality |
| CN108872331A (en) * | 2017-12-28 | 2018-11-23 | 无锡大禹科技有限公司 | A kind of intelligence reverse-flow type oil smoke concentration on-line monitoring instrument |
| CN112558506A (en) * | 2019-09-25 | 2021-03-26 | 佛山市顺德区美的洗涤电器制造有限公司 | Control method, kitchen device and computer-readable storage medium |
| WO2022141475A1 (en) * | 2020-12-31 | 2022-07-07 | 广州奥松电子有限公司 | Measurement system and apparatus, and measurement method and temperature and humidity compensation method therefor |
| CN113252846B (en) * | 2021-04-30 | 2023-06-20 | 西北工业大学 | Method and equipment for monitoring concentration of oil smoke VOCs gas for long-time continuous monitoring |
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| CN2308894Y (en) * | 1997-07-31 | 1999-02-24 | 深圳市环境保护监测站 | Oil fume collector |
| CN201600376U (en) * | 2009-12-22 | 2010-10-06 | 宇星科技发展(深圳)有限公司 | Oil fume on-line monitoring device |
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