CN210222042U - Online intelligent air quality formaldehyde tester - Google Patents
Online intelligent air quality formaldehyde tester Download PDFInfo
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- CN210222042U CN210222042U CN201920986686.4U CN201920986686U CN210222042U CN 210222042 U CN210222042 U CN 210222042U CN 201920986686 U CN201920986686 U CN 201920986686U CN 210222042 U CN210222042 U CN 210222042U
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Abstract
The utility model discloses an online intelligent air quality formaldehyde tester, include: the absorption liquid injection port is connected with the absorption liquid inlet of the reaction bottle through an absorption liquid plunger pump; the flowmeter is connected with the air collecting port and is connected with the air inlet of the reaction bottle through the sampling electromagnetic valve; the air pump is connected with the residual air exhaust port and is connected with the exhaust port of the reaction bottle through an exhaust electromagnetic valve; the reaction liquid injection port is connected with the reaction liquid inlet of the reaction bottle through a reaction liquid plunger pump; the colorimetric pool is connected with a liquid outlet of the reaction bottle through a liquid discharge electromagnetic valve and is connected with a waste liquid discharge port through a liquid discharge peristaltic pump; a light emitting tube; a micro-spectrophotometer; the analysis processing module is connected with the micro spectrophotometer. The utility model discloses a full-automatic, accurate air ration sampling, concentrated enrichment, the catalytic color reaction, real-time absorbance measurement, the calibration of automatic formaldehyde concentration curve is established, really realizes formaldehyde pollution concentration in the continuous on-line measuring air.
Description
Technical Field
The utility model relates to an air monitering technical field especially relates to a can carry out long-term, continuous online quantitative determination and online intelligent air quality formaldehyde apparatus of analysis to formaldehyde pollution in the air.
Background
Formaldehyde has been identified by the world health organization as a carcinogenic and teratogenic substance with strong carcinogenic and carcinogenic effects. The influence of formaldehyde on human health is mainly manifested in abnormal sense of smell, irritation, allergy, lung function, liver function and immune function. When the concentration reaches 0.06-0.07 mg/cubic meter per cubic meter of air, children suffer slight asthma. When the formaldehyde content in the indoor air is 0.1 mg/cubic meter, peculiar smell and uncomfortable feeling exist; when the content of the compound reaches 0.5 mg/cubic meter, eyes can be stimulated to cause lacrimation; up to 0.6 mg/cubic meter, can cause throat discomfort or pain. Higher concentrations can cause nausea, vomiting, cough, chest distress, asthma and even pulmonary edema; when 30 mg/cubic meter is reached, the death is immediately caused. Chronic respiratory diseases, nasopharyngeal carcinoma, colon cancer, brain tumor, gene mutation of cell nucleus, DNA single-strand internal cross-linking, DNA and protein cross-linking, and the suppression of repair of DNA damage, pregnancy syndrome, chromosome abnormality of newborn, leukemia, and memory and intelligence deterioration of teenagers caused by long-term exposure to low-dose formaldehyde. Among all the contacters, children and pregnant women are particularly sensitive to formaldehyde and are more harmful.
However, formaldehyde is an important industrial chemical for manufacturing other chemicals, building materials, household products and consumer products, is widely used in the industries of resin manufacturing, coatings, artificial fibers, plastics, rubber, printing and dyeing, pharmacy, leather making, furniture and the like, and is an indispensable important raw material in the current industrial system in the processes of medical disinfection, anticorrosion, fumigation and the like. The high volatility of formaldehyde inevitably entails serious problems of air pollution with its widespread use. The monitoring and control of formaldehyde pollution is urgently slow, and the environmental protection department puts forward the limit and monitoring of formaldehyde emission for many times.
Currently, the detection of formaldehyde in ambient air basically stays in a laboratory offline detection mode, and common methods comprise a colorimetric test kit, an electrochemical sensor, a metal oxide sensor, a manual spectroscopy method and the like.
The colorimetric kit is used for testing the concentration of formaldehyde by utilizing the color change degree of a color reagent after the color reagent reacts with the color change test paper and the formaldehyde in the air, and the method needs a large amount of manual sensory judgment, has low test precision and poor repeatability and can only roughly judge the concentration range.
The electrochemical and metal oxide sensor converts the concentration of formaldehyde in the air into an electric signal by utilizing an electrochemical or catalytic oxidation principle, has small volume, high test sensitivity and small volume, but has poor selectivity to a target monitored object in the gas, easily causes interference to organic compounds with similar characteristics, cannot accurately measure the concentration of the formaldehyde in the environment with other organic object gases, and simultaneously can be influenced by a plurality of factors such as environment temperature and humidity, airflow speed and the like due to the limitation of a reaction principle, so that the method is generally used for portable equipment, quick pre-detection, contrast reference and the like.
The method is characterized in that the method is a high-precision detection means which accords with the national formaldehyde detection standard, has extremely high target object selectivity and repeatability, only depends on a large amount of complicated manual operation processes at present, consumes time and labor, the general process comprises the steps of preparing buffer adsorption liquid, quantitatively adsorbing and sampling outgoing gas, and taking adsorbed concentrated solution back to a laboratory for quantitative off-line detection, the detection timeliness of the whole process is poor, overproof judgment cannot be made at the first time, the method is difficult to be used as an effective continuous monitoring means and buffer solution, the prepared colorimetric reaction solution has short validity period and cannot be kept for a long time, and if the time delay occurs in the process, the final detection precision is often influenced.
Therefore, how to realize the full-automatic uninterrupted online quantitative detection and analysis of formaldehyde pollution in the air becomes a technical problem to be solved urgently for monitoring and treating the formaldehyde pollution.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an online intelligent air quality formaldehyde apparatus to the technical problem who exists among the prior art, can realize carrying out full-automatic incessant online quantitative determination and analysis to formaldehyde pollution in the air.
In order to achieve the above object, the utility model provides an online intelligent air quality formaldehyde tester, online intelligent air quality formaldehyde tester includes: the absorption liquid injection port (9) is connected with the absorption liquid inlet of the reaction bottle (4) through an absorption liquid plunger pump (11) and is used for pumping quantitative formaldehyde absorption liquid into the reaction bottle (4) under the action of the absorption liquid plunger pump (11); the flow meter (2) is connected with the air collection port (1), is connected with an air inlet of the reaction bottle (4) through a sampling electromagnetic valve (3), and is used for measuring the volume of an air sample collected by the air collection port (1) when the sampling electromagnetic valve (3) is opened and controlling the sampling flow rate, and the air sample enters the formaldehyde absorption liquid in the reaction bottle (4) through the air inlet; the air suction pump (6) is connected with the residual air exhaust port (7), is connected with the exhaust port of the reaction bottle (4) through an exhaust electromagnetic valve (5), is used for switching the exhaust electromagnetic valve (5) from an emptying mode to a vacuum mode, provides negative pressure vacuum for the collection of an air sample, and is used for discharging residual air after the air sample is dissolved in the formaldehyde absorption liquid and is enriched in formaldehyde through the exhaust electromagnetic valve (5) and the residual air exhaust port (7); the reaction liquid injection port (8) is connected with the reaction liquid inlet of the reaction bottle (4) through a reaction liquid plunger pump (12) and is used for extracting quantitative color development reaction liquid under the action of the reaction liquid plunger pump (12) and injecting the quantitative color development reaction liquid into the reaction bottle (4) to perform formaldehyde color development reaction; the colorimetric pool (18) is connected with a liquid discharge port of the reaction bottle (4) through a liquid discharge electromagnetic valve (17), is connected with a waste liquid discharge port (23) through a liquid discharge peristaltic pump (19), and is used for receiving the formaldehyde color development reaction liquid under the action of the liquid discharge peristaltic pump (19) and discharging the formaldehyde color development reaction liquid through the waste liquid discharge port (23) when the liquid discharge electromagnetic valve (17) is opened; a light emitting tube (20) for emitting a monochromatic light source corresponding to the absorption wavelength of the color-developing compound; the micro spectrophotometer (21) is used for measuring the absorbance of the formaldehyde color reaction liquid to the monochromatic light source when the formaldehyde color reaction liquid passes through the colorimetric pool (18) to obtain an absorbance measurement value; and the analysis processing module (22) is connected with the micro spectrophotometer (21) and is used for obtaining the relative concentration of the chromogenic compound in the formaldehyde chromogenic reaction liquid according to the absorbance measurement value, and further obtaining the concentration of formaldehyde in the air through conversion of a concentration absorbance standard curve.
The utility model has the advantages that: the utility model discloses inherit the sensitivity of spectrum and to the selectivity only of formaldehyde, realized full-automatic, accurate air ration sampling, concentrated enrichment, catalytic color reaction, real-time absorbance measurement, automatic formaldehyde concentration curve's calibration is established, really realizes formaldehyde pollution concentration in the continuous on-line measuring air. The system performance self-checking, multi-point marking line establishment, QC inspection, continuous sampling, automatic absorbance measurement, concentration calculation, data analysis and storage and/or network platform uploading can be completed in an unattended environment. Has fundamental promotion effect on the development of the environment detection industry and has important practical application and market development value.
Drawings
Fig. 1, the utility model discloses the structure schematic diagram of an online intelligent air quality formaldehyde determination appearance embodiment.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention. Furthermore, the present invention repeats reference numerals and/or reference letters in different examples, which are repeated for purposes of simplicity and clarity and do not, themselves, indicate a relationship between the various embodiments and/or arrangements discussed.
The online monitoring of the release concentration of the formaldehyde pollution source within 24 hours is the most effective way for monitoring and treating the formaldehyde pollution from the source, and the online formaldehyde determination is an indispensable means for environmental monitoring. The utility model aims at solving a great deal of limitation of present formaldehyde detection means, develop complete full-automatic incessant online intelligent air quality formaldehyde apparatus of formaldehyde.
Referring to fig. 1, the structure of an embodiment of the on-line intelligent air quality formaldehyde analyzer of the present invention is schematically illustrated, in which the components are directly connected or connected through corresponding pipelines 24, and the airtightness of the whole system is ensured.
Specifically, online intelligent air quality formaldehyde apparatus includes: the absorption liquid injection port 9 is connected with the absorption liquid inlet of the reaction bottle 4 through an absorption liquid plunger pump 11 and is used for extracting quantitative formaldehyde absorption liquid and injecting the formaldehyde absorption liquid into the reaction bottle 4 under the action of the absorption liquid plunger pump 11; the flowmeter 2 is connected with the air collection port 1, is connected with an air inlet of the reaction bottle 4 through a sampling electromagnetic valve 3, and is used for metering the volume of an air sample collected by the air collection port 1 when the sampling electromagnetic valve 3 is opened and controlling the sampling flow rate, and the air sample enters the formaldehyde absorption liquid in the reaction bottle 4 through the air inlet; and the air suction pump 6 is connected with the residual air exhaust port 7, is connected with the exhaust port of the reaction bottle 4 through the exhaust electromagnetic valve 5, is used for switching the exhaust electromagnetic valve 5 from a emptying mode to a vacuum mode to provide negative pressure vacuum for collection of an air sample, and is used for discharging residual air after the air sample is dissolved and enriched in formaldehyde through the exhaust electromagnetic valve 5 and the residual air exhaust port 7.
Specifically, air quantification sampling requires the stable and repeatable collection of a volumetric air sample. Because of the strong formaldehyde activity in air samples, all components that contact the air sample must be made of inert materials. In order to compensate the influence of air pressure fluctuation and environment temperature and humidity on the effective sampling volume, a high-precision mass flow meter can be adopted to be matched with a diaphragm pump with adjustable speed, the uncertain factors of sampling precision caused by air pressure change and sampling pressure disturbance can be automatically compensated, and the sampling enrichment process is stopped when the sampling volume of the air sample reaches a preset value. Due to the low formaldehyde concentration in the air sample, the air sample can be pre-concentrated. By controlling the flow rate and the sampling time, the concentration multiple can be flexibly set, and the formaldehyde detection in a wide concentration range can be responded. Meanwhile, in order to ensure the service life of the mass flow meter, a semiconductor refrigeration trapping cold trap can be used for overcoming the problem of influence of steam and reaction liquid steam pollution on the corrosion and precision of the mass flow meter. A corrosion-resistant orifice differential pressure flow meter may also be used as an alternative to a mass flow meter. Due to the extremely high water solubility of formaldehyde, pure water can also be used to carry out enrichment preconcentration on formaldehyde in an air sample in a bubbling gas washing mode. The sampling can be carried out at the preconcentration rear end by adopting a negative pressure suction mode, so that the direct contact between a mass flow meter and a diaphragm pump which cannot be made of all-inert materials and an air sample can be effectively avoided, the pollution is avoided, the reaction inactivation of the air sample can be avoided, and the detection sensitivity and the repeatability are ensured.
In a further embodiment, the flow meter 2 is a mass flow meter or a differential pressure flow meter.
The online intelligent air quality formaldehyde tester further comprises: and a reaction liquid inlet 8 which is connected with the reaction liquid inlet of the reaction bottle 4 through a reaction liquid plunger pump 12 and is used for extracting quantitative color development reaction liquid and injecting the quantitative color development reaction liquid into the reaction bottle 4 under the action of the reaction liquid plunger pump 12 so as to carry out formaldehyde color development reaction.
Specifically, after the collection and pre-concentration absorption of the air sample are completed, corresponding chromogenic reaction liquid is automatically and quantitatively added to carry out compound catalytic chromogenic reaction. According to the detection requirements of different concentrations, different chromogenic reaction liquids can be selected. For example, for formaldehyde detection of a low-concentration pollution source, a phenol reagent can be selected to react with formaldehyde in the formaldehyde-enriched absorption liquid to generate oxazine, and then the oxazine is oxidized by ferric ions in an acidic solution to form a blue-green compound. For formaldehyde detection of a high-concentration pollution source, formaldehyde in the formaldehyde-enriched absorption solution can react with acetylacetone under an acetic acid-ammonium acetate buffer with the pH value of 6, and a stable yellow compound is rapidly generated under catalysis of a proper reaction temperature (for example, 99 ℃). The color reaction can be rapidly and uniformly completed by controlling the proper reaction temperature and matching with magnetic stirring. After the color reaction is finished, the liquid must be rapidly cooled to be slightly higher than the room temperature and then the absorbance measurement is carried out, so that a circulating water cooling device can be adopted to efficiently reduce the temperature of the formaldehyde color reaction liquid. The container used in the whole color reaction is made of PTFE material, so that the air tightness is ensured, and no dead angle exists, so that the container can be automatically cleaned after the color reaction is finished, and the cross contamination is avoided.
In a further embodiment, the online intelligent air quality formaldehyde tester further comprises: and a stirrer 14 connected to the reaction flask 4 for stirring the liquid in the reaction flask 4 during the formaldehyde color reaction. Preferably, the stirrer 14 is a magnetic stirrer to rapidly and uniformly stir the liquid in the reaction flask 4.
In a further embodiment, the online intelligent air quality formaldehyde tester further comprises: and the heater 15 is connected with the reaction bottle 4 and used for heating the reaction bottle 4 during the formaldehyde color reaction so as to accelerate the color reaction.
In a further embodiment, the online intelligent air quality formaldehyde tester further comprises: and the cooler 16 is connected with the reaction bottle 4 and is used for cooling the formaldehyde color development reaction liquid after the formaldehyde color development reaction is finished. Specifically, the cooler 16 may include: a cooling unit 161 connected to the liquid outlet of the reaction flask 4 via a liquid outlet solenoid valve 17 for cooling the formaldehyde color reaction solution after the completion of the formaldehyde color reaction; the cooling unit 161, together with the cooling water pump 162 and the cooling fan 163, forms a circulation cooling system for circulating and cooling the refrigerant fluid in the cooling unit 161.
The online intelligent air quality formaldehyde tester further comprises: the colorimetric pool 18 is connected with a liquid discharge port of the reaction bottle 4 through a liquid discharge electromagnetic valve 17, is connected with a waste liquid discharge port 23 through a liquid discharge peristaltic pump 19, and is used for receiving the formaldehyde color development reaction liquid under the action of the liquid discharge peristaltic pump 19 and discharging the formaldehyde color development reaction liquid through the waste liquid discharge port 23 when the liquid discharge electromagnetic valve 17 is opened; a light emitting tube 20 for emitting a monochromatic light source corresponding to the absorption wavelength of the color-developing compound; a micro spectrophotometer 21 for measuring the absorbance of the formaldehyde color reaction solution to the monochromatic light source when passing through the colorimetric pool 18 to obtain an absorbance measurement value; and the analysis processing module 22 is connected with the micro spectrophotometer 21 and is used for obtaining the relative concentration of the chromogenic compound in the formaldehyde chromogenic reaction liquid according to the absorbance measurement value, and further obtaining the concentration of formaldehyde in the air through conversion of a concentration absorbance standard curve. The obtained concentration of formaldehyde in the air can be stored in a database of the system and also can be transmitted to an upper computer through a network platform.
Specifically, during absorbance measurement, the parts where the formaldehyde color reaction liquid flows are made of quartz glass materials and have no dead angles, so that the formaldehyde color reaction liquid is easy to clean and has no cross contamination after flowing. The flow rate of the formaldehyde color reaction liquid can be accurately controlled, and bubbles and liquid disturbance are avoided from interfering the accuracy of absorbance measurement. The narrow-band LED light source at the characteristic absorption wavelength of the color-developing compound can be adopted, and the constant-current driving circuit is matched to ensure that the light source quality is stable, the service life is greatly prolonged, the requirement of 24-hour online detection is met, and the operation and maintenance cost is reduced. The full-wavelength spectrum scanning can be quickly completed by using a miniature CCD (charge coupled device) spectral detector, the volume is small, the whole 6U cabinet machine module can be installed, the environment temperature, the humidity and the vibration resistance are good, and the online long-term stable operation under the complex use environment is suitable. The CCD light splitting detector can automatically finish dark current correction, color comparison background spectrum deduction and output transmittance data for data analysis. The absorbance measurement module 103 can be optically and electromagnetically shielded, so that the detection signal-to-noise ratio can meet the detection requirement of low-concentration samples, and the detection sensitivity of low concentration can be ensured.
In a further embodiment, the light emitting tube 20 is a narrow-band LED light source, and the micro spectrophotometer 21 is a micro CCD spectrophotometer.
In the cleaning mode: the absorption liquid injection port 9 is further used for pumping a certain amount of formaldehyde absorption liquid into the reaction bottle 4 to clean the reaction bottle 4 under the action of the absorption liquid plunger pump 11; the system controls the liquid discharge electromagnetic valve 17 to be opened, the cleaning liquid in the reaction bottle 4 is pumped out under the action of the liquid discharge peristaltic pump 19, and the connecting pipeline of the components and the colorimetric pool 18 are cleaned along the way and then discharged through the waste liquid discharge port 23. Whether the system is completely cleaned can be judged by the absorbance of the liquid flowing through the cuvette 18 during the washing process.
Specifically, each component in the system that comes into contact with formaldehyde may be cleaned with the same liquid (e.g., pure water) as the absorbing liquid used to dissolve the formaldehyde enriched in the air sample. Whether the system is clean can be judged by the absorbance of the liquid flowing through the absorbance measurement module 103 during the washing process, so as to start the next sampling and analyzing period. The working mechanism of each component in the sampling analysis period can be triggered by the timer timing.
The online intelligent air quality formaldehyde tester further comprises: and a standard solution injection port 10 connected with the standard solution inlet of the reaction bottle 4 through a standard solution plunger pump 13, and configured to extract formaldehyde standard mother solutions with different volumes and calibrated concentrations under the action of the standard solution plunger pump 13, inject the formaldehyde standard mother solutions into the reaction bottle 4 for dilution, and perform a color development reaction on the diluted standard solution to measure the absorbance of the diluted standard solution with different volumes and corresponding concentrations. The multi-concentration standard sample configuration can be re-performed again by setting the time interval or setting the number of times the collection analysis is completed.
Specifically, in order to ensure the accuracy of concentration calculation, the absorbance concentration calibration curve of the reactant of the multi-concentration standard formaldehyde solution needs to be automatically calibrated. Because formaldehyde has high activity, is easy to oxidize and self-polymerize, and the low-concentration standard solution cannot be stably stored, the concentration can be ensured to be accurate only by using the formaldehyde in situ. The utility model discloses by the high concentration formaldehyde standard mother liquor through the certification is markd to national authority, the dilution standard solution of preparing 6 kind at least concentrations is diluted to carry out the absorbance measurement to the dilution standard solution of each concentration, with demarcation absorbance concentration calibration curve. A precise pulse metering pump can be adopted, a multi-concentration standard sample is dynamically diluted and configured, and the multi-concentration standard sample is used for intelligent QC inspection and automatic fitting of a marked line so as to ensure long-term stable operation and detection reliability of the system.
Specifically, the surfaces of all components in contact with the formaldehyde solution (including the formaldehyde standard mother solution and the diluted standard solution) must be kept inert to formaldehyde, and meanwhile, a light-resistant glass container is adopted as the formaldehyde standard mother solution storage container, and a gas one-way valve is matched with a PTFE inert pipeline to ensure that the formaldehyde standard mother solution can be stably stored in an operation and maintenance period.
The utility model discloses online intelligent air quality formaldehyde determinator has following innovation:
1) the gas sampling amount is precisely controlled, and the influence of the air pressure of a sampling point is avoided; the sampling concentration multiple can be accurately adjusted, the detection requirements of the formaldehyde pollution source with high/low concentration and large dynamic range are met, and the measurement repeatability of the system is improved.
2) The LED light source is matched with the miniature CCD detector, so that the system has the sensitivity of a spectrum method and unique selectivity to formaldehyde, breaks through the offline detection limitation of the traditional ultraviolet spectrophotometer, ensures the miniaturization of an online system, runs stably for a long time in all weather, improves the overall environmental adaptability of the system and reduces the maintenance cost.
3) The integrated sampling absorption and enrichment, the in-situ color reaction and the synchronous high-speed heating and cooling flow path are adopted, the continuous and uninterrupted sampling capacity is realized, at least one group of air samples can be detected and analyzed every hour, and the high-timeliness real-time detection feedback can be provided.
4) By integrating intelligent control and data processing, the linkage control and data preprocessing functions among all the components of the system are moved forward to the front end of the system, so that system parameters can be flexibly configured through the upper computer and can be operated on line independently of the upper computer, the problem caused by insufficient stability of the system and the upper computer or the communication of the system and the upper computer is solved, and the reliable and efficient on-line automatic operation of the system is ensured.
4) The multi-concentration standard sample is configured through automatic dynamic dilution and is used for intelligent QC inspection of the system and automatic establishment of a marking line, and long-term stable operation and detection reliability of the system are guaranteed.
The utility model discloses online intelligent air quality formaldehyde apparatus has inherited the sensitivity of spectrum and to the selectivity only of formaldehyde, has realized full-automatic, accurate air ration sampling, and concentrated enrichment, catalytic color reaction, real-time absorbance measurement, automatic formaldehyde concentration curve's calibration is established, really realizes formaldehyde pollution concentration in the continuous on-line measuring air. The system performance self-checking, multi-point marking line establishment, QC inspection, continuous sampling, automatic absorbance measurement, concentration calculation, data analysis and storage and/or network platform uploading can be completed in an unattended environment. Has fundamental promotion effect on the development of the environment detection industry and has important practical application and market development value.
The working principle of the present invention is given below with reference to fig. 1:
the first step is as follows: and (5) quantitatively sampling air. Due to the extremely high water solubility of formaldehyde, pure water can be used for enriching and concentrating formaldehyde in the air in a bubbling gas washing mode. A certain amount of absorption liquid (pure water) is pumped from an absorption liquid injection port 9 by an absorption liquid plunger pump 11 and is injected into the reaction flask 4, and air in the flask is discharged by an exhaust electromagnetic valve 5; starting the air pump 6, and switching the exhaust electromagnetic valve 5 from the current emptying mode to the vacuum mode; the reaction bottle 4 is heated by the heater 15, so that negative pressure is generated in the reaction bottle 4, the sampling electromagnetic valve 3 is opened at the moment, the air sample flows through the flowmeter 2 from the air collecting port 1 and then enters the bubbling dispersion port at the bottom of the bottle from the air inlet end (central port) of the reaction bottle 4 through the sampling electromagnetic valve 3, and after the pure water dissolves formaldehyde in the enriched gas, residual air is exhausted through the exhaust electromagnetic valve 5 and is exhausted through the residual air exhaust port 7 by the air pump 6. In the process, the flow meter 2 is used for metering the volume of the sampled gas, the sampling flow rate is controlled at the same time, and the sampling enrichment process is stopped when the sampling volume reaches a preset value.
The second step is that: and (4) formaldehyde color reaction. Quantitative color reaction liquid is extracted from the reaction liquid injection port 8 by a reaction liquid plunger pump 12, added into the formaldehyde enrichment absorption liquid in the reaction bottle 4, heated to a proper reaction temperature by a control heater 15, and a stirrer 14 is started, so that the color reaction is rapidly and uniformly completed. Then the system opens the liquid discharge electromagnetic valve 17 and the liquid discharge peristaltic pump 19, starts the cooling water pump 162 and the cooling fan 163, and enables the high-temperature formaldehyde color reaction liquid to flow through the cooling part 161 and then quickly recover to the state close to the outdoor, and then flows into the colorimetric pool 18.
The third step: and (5) measuring the absorbance. The system controls the liquid discharge electromagnetic valve 17 to be opened, and the colorimetric pool 18 receives the formaldehyde color reaction liquid under the action of the liquid discharge peristaltic pump 19. For the formaldehyde color reaction solution after the color reaction, using a light emitting tube 20 to emit a monochromatic LED light source corresponding to the characteristic absorption wavelength of the compound generated in the formaldehyde color reaction solution; measuring the absorbance of the formaldehyde color reaction solution to the monochromatic light source when the formaldehyde color reaction solution passes through the colorimetric pool 18 by using a micro spectrophotometer 21 to obtain an absorbance measurement value; using an analysis processing module 22 to obtain the relative concentration of the chromogenic compound in the formaldehyde chromogenic reaction liquid according to the absorbance measurement value, and further obtaining the concentration of formaldehyde in the air through the conversion of a concentration absorbance standard curve; the waste liquid is finally discharged through the waste liquid discharge port 23. The obtained concentration of formaldehyde in the air can be stored in a database of the system and also can be transmitted to an upper computer through a network platform.
The fourth step: and (5) cleaning the instrument. Still adopting pure water cleaning, absorption liquid plunger pump 11 draws quantitative pure water from absorption liquid inlet 9 and pours into the reaction flask 4 into, and agitator 14 washs reaction flask 4 rapidly, opens flowing back solenoid valve 17 and flowing back peristaltic pump 19 again, draws the washing liquid out reaction flask 4, washs each subassembly and each pipeline along the way, finally discharges through waste liquid discharge port 23. Whether the instrument is completely cleaned can be judged by the absorbance of the liquid flowing through the cuvette 18 during the washing process, so that the next sampling and analysis period can be started.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides an online intelligent air quality formaldehyde apparatus, its characterized in that, online intelligent air quality formaldehyde apparatus includes: the absorption liquid injection port (9) is connected with the absorption liquid inlet of the reaction bottle (4) through an absorption liquid plunger pump (11) and is used for pumping quantitative formaldehyde absorption liquid into the reaction bottle (4) under the action of the absorption liquid plunger pump (11);
the flow meter (2) is connected with the air collection port (1), is connected with an air inlet of the reaction bottle (4) through a sampling electromagnetic valve (3), and is used for measuring the volume of an air sample collected by the air collection port (1) when the sampling electromagnetic valve (3) is opened and controlling the sampling flow rate, and the air sample enters the formaldehyde absorption liquid in the reaction bottle (4) through the air inlet;
the air suction pump (6) is connected with the residual air exhaust port (7), is connected with the exhaust port of the reaction bottle (4) through an exhaust electromagnetic valve (5), is used for switching the exhaust electromagnetic valve (5) from an emptying mode to a vacuum mode, provides negative pressure vacuum for the collection of an air sample, and is used for discharging residual air after the air sample is dissolved in the formaldehyde absorption liquid and is enriched in formaldehyde through the exhaust electromagnetic valve (5) and the residual air exhaust port (7);
the reaction liquid injection port (8) is connected with the reaction liquid inlet of the reaction bottle (4) through a reaction liquid plunger pump (12) and is used for extracting quantitative color development reaction liquid under the action of the reaction liquid plunger pump (12) and injecting the quantitative color development reaction liquid into the reaction bottle (4) to perform formaldehyde color development reaction;
the colorimetric pool (18) is connected with a liquid discharge port of the reaction bottle (4) through a liquid discharge electromagnetic valve (17), is connected with a waste liquid discharge port (23) through a liquid discharge peristaltic pump (19), and is used for receiving the formaldehyde color development reaction liquid under the action of the liquid discharge peristaltic pump (19) and discharging the formaldehyde color development reaction liquid through the waste liquid discharge port (23) when the liquid discharge electromagnetic valve (17) is opened;
a light emitting tube (20) for emitting a monochromatic light source corresponding to the absorption wavelength of the color-developing compound;
the micro spectrophotometer (21) is used for measuring the absorbance of the formaldehyde color reaction liquid to the monochromatic light source when the formaldehyde color reaction liquid passes through the colorimetric pool (18) to obtain an absorbance measurement value;
and the analysis processing module (22) is connected with the micro spectrophotometer (21) and is used for obtaining the relative concentration of the chromogenic compound in the formaldehyde chromogenic reaction liquid according to the absorbance measurement value, and further obtaining the concentration of formaldehyde in the air through conversion of a concentration absorbance standard curve.
2. The online intelligent air quality formaldehyde tester as claimed in claim 1, wherein the flow meter (2) is a mass flow meter or a differential pressure flow meter.
3. The on-line intelligent air quality formaldehyde tester of claim 1, further comprising:
and a stirrer (14) connected to the reaction flask (4) and stirring the liquid in the reaction flask (4) during the formaldehyde color reaction.
4. The on-line intelligent air quality formaldehyde tester as recited in claim 3, wherein the agitator (14) is a magnetic agitator.
5. The on-line intelligent air quality formaldehyde tester of claim 1, further comprising:
and a heater (15) connected to the reaction flask (4) for heating the reaction flask (4) during the formaldehyde color reaction.
6. The on-line intelligent air quality formaldehyde tester of claim 1, further comprising:
and the cooler (16) is connected with the reaction bottle (4) and is used for cooling the formaldehyde color development reaction liquid after the formaldehyde color development reaction is finished.
7. The on-line intelligent air quality formaldehyde tester as recited in claim 6, wherein the cooler (16) comprises: and the cooling component (161) is connected with a liquid discharge port of the reaction bottle (4) through a liquid discharge electromagnetic valve (17) so as to cool the formaldehyde color development reaction liquid after the formaldehyde color development reaction is finished, and forms a circulating cooling system with a cooling water pump (162) and a cooling fan (163) so as to circularly cool the refrigerating liquid in the cooling component (161).
8. The on-line intelligent air quality formaldehyde tester as claimed in claim 1, wherein the light emitting tube (20) adopts a narrow-band LED light source, and the micro spectrophotometer (21) adopts a micro CCD spectrophotometer.
9. The on-line intelligent air quality formaldehyde tester of claim 1,
the absorption liquid injection port (9) is further used for pumping quantitative formaldehyde absorption liquid to be injected into the reaction bottle (4) to clean the reaction bottle (4) under the action of the absorption liquid plunger pump (11);
the system controls the liquid discharge electromagnetic valve (17) to be opened, the cleaning liquid in the reaction bottle (4) is pumped out under the action of the liquid discharge peristaltic pump (19), and the cleaning liquid is discharged through the waste liquid discharge port (23) after the connecting pipeline of the assembly and the colorimetric pool (18) are cleaned along the way.
10. The on-line intelligent air quality formaldehyde tester of claim 1, further comprising:
and the standard solution injection inlet (10) is connected with the standard solution inlet of the reaction bottle (4) through a standard solution plunger pump (13) and is used for extracting formaldehyde standard mother liquor with calibrated concentrations in different volumes under the action of the standard solution plunger pump (13), injecting the formaldehyde standard mother liquor into the reaction bottle (4) for dilution, and carrying out color development reaction on the diluted standard solution so as to measure the absorbance of the diluted standard solution with the concentrations corresponding to the different volumes and further calibrate an absorbance concentration correction curve.
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| CN201920986686.4U CN210222042U (en) | 2019-06-27 | 2019-06-27 | Online intelligent air quality formaldehyde tester |
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| CN201920986686.4U CN210222042U (en) | 2019-06-27 | 2019-06-27 | Online intelligent air quality formaldehyde tester |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161944A (en) * | 2020-10-14 | 2021-01-01 | 南京科创检测技术有限公司 | Ultraviolet-visible light measuring system and measuring method |
| CN112525660A (en) * | 2020-11-12 | 2021-03-19 | 核工业北京化工冶金研究院 | Automatic sampling, sample reserving and concentration proportioning device based on micro volume |
| CN113899708A (en) * | 2020-07-07 | 2022-01-07 | 温州交大科技发展有限公司 | Automatic formaldehyde intelligent detector based on the use of peristaltic pump to realize liquid flow |
| CN116907928A (en) * | 2023-06-08 | 2023-10-20 | 江苏省环境监测中心 | Full-automatic measuring device and method for phosphorus pentoxide in air |
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2019
- 2019-06-27 CN CN201920986686.4U patent/CN210222042U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899708A (en) * | 2020-07-07 | 2022-01-07 | 温州交大科技发展有限公司 | Automatic formaldehyde intelligent detector based on the use of peristaltic pump to realize liquid flow |
| CN112161944A (en) * | 2020-10-14 | 2021-01-01 | 南京科创检测技术有限公司 | Ultraviolet-visible light measuring system and measuring method |
| CN112525660A (en) * | 2020-11-12 | 2021-03-19 | 核工业北京化工冶金研究院 | Automatic sampling, sample reserving and concentration proportioning device based on micro volume |
| CN116907928A (en) * | 2023-06-08 | 2023-10-20 | 江苏省环境监测中心 | Full-automatic measuring device and method for phosphorus pentoxide in air |
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