CN209055455U - A kind of Ultraviolet Photometric Method COD online analyzer - Google Patents
A kind of Ultraviolet Photometric Method COD online analyzer Download PDFInfo
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- CN209055455U CN209055455U CN201821566915.9U CN201821566915U CN209055455U CN 209055455 U CN209055455 U CN 209055455U CN 201821566915 U CN201821566915 U CN 201821566915U CN 209055455 U CN209055455 U CN 209055455U
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- solenoid valve
- pipeline
- water pump
- ultraviolet
- online analyzer
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Abstract
The utility model is specifically related to a kind of Ultraviolet Photometric Method COD online analyzer, it is characterised in that: the Ultraviolet Photometric Method COD online analyzer includes filter device, the first solenoid valve, second solenoid valve, third solenoid valve, water pump, measuring unit, measuring flume;Testing liquid is connected by pipeline with the first solenoid valve by pipeline by filter device, filter device, the first solenoid valve is connected by pipeline with water pump, and water pump is connected by pipeline with measuring flume;It demarcates liquid and second solenoid valve is passed through by pipeline;Second solenoid valve is connected by pipeline with water pump, and water pump is connected by pipeline with measuring flume;Cleaning liquid is connected by pipeline by third solenoid valve;Third solenoid valve is connected by pipeline with water pump, and water pump is connected by pipeline with measuring flume;Ultraviolet source is set in the measuring flume;The ultraviolet light of the ultraviolet source transmitting passes through the liquid in measuring flume and is measured unit reception.This method can be improved the Stability and veracity of apparatus measures.
Description
Technical field
The invention belongs to technical field of analytical instruments, and in particular to a kind of Ultraviolet Photometric Method COD online analyzer.
Background technique
New UV Spectrophotometric COD online analyzer is a kind of novel COD online analyzer, it be according under certain condition,
There is good correlation between COD and its ultraviolet absorptivity in measured medium, this correlation meets " lambert-ratio
That law ", using this correlation, may be implemented the measurement to measured medium COD.
" Lambert-Beer's law " is pointed out: when collimated monochromatic ligth passes through the solution of uniform non-heat dissipation, suction of the solution to light
Receipts degree is directly proportional to the thickness of the concentration of solution and solution layer,
That is: A=Ln (I0/I)=KCL
(wherein: A- absorbance;I0- incident intensity;I- projects light intensity;C- solution concentration;L- sample path length;K- ratio is normal
Number).Instrument passes through detection I0And I, and COD value is acquired according to above-mentioned formula.
In the prior art, to I0Measurement be usually in the calibration of instrument to carry out one-shot measurement, need will be into for calibration every time
Sample pipe is manually inserted into blank sample, and obtains and numerical value is stored in Instrument memory.I value is only measured in course of normal operation,
Calculate COD value.But this measurement method is due to the influence of the factors such as environment temperature, device decaying, I0It is constantly to vary
, this can cause large effect to measurement.In the prior art, usually measurement result is caused in discovery biggish
When influence, then re-start an instrumental calibration.The inconvenience of measurement can be brought in this way.
Summary of the invention
1. technical problem to be solved:
For technical problem set forth above, this method proposes a kind of Ultraviolet Photometric Method COD online analyzer and its work
Method.This method, which can overcome above-mentioned measure as caused by environment temperature and device decaying, to be influenced, and apparatus measures are improved
Stability and veracity.
2. technical solution:
A kind of Ultraviolet Photometric Method COD online analyzer, it is characterised in that: the Ultraviolet Photometric Method COD online analyzer packet
Include filter device, the first solenoid valve, second solenoid valve, third solenoid valve, water pump, measuring unit, measuring flume;Testing liquid passes through
Pipeline is connected by pipeline with the first solenoid valve by filter device, filter device, the first solenoid valve passes through pipeline and water pump phase
Even, water pump is connected by pipeline with measuring flume;It demarcates liquid and second solenoid valve is passed through by pipeline;Second solenoid valve passes through pipeline
It is connected with water pump, water pump is connected by pipeline with measuring flume;Cleaning liquid is connected by pipeline by third solenoid valve;Third electricity
Magnet valve is connected by pipeline with water pump, and water pump is connected by pipeline with measuring flume;Ultraviolet source is set in the measuring flume;It is described
The ultraviolet light of ultraviolet source transmitting passes through the liquid in measuring flume and is measured unit reception.
Further, the measuring unit includes photoelectric tube;The photoelectric tube receives the purple of the liquid in measuring flume
Outer light.
Further, the photoelectric tube is two, and respectively work photoelectric tube and auxiliary photoelectric tube;The work photoelectric tube
Surface covers the optical filter that wavelength is 254nm;The optical filter that the fill-in light vessel surface covering wavelength is 546nm.
Further, the ultraviolet source is cold cathode UV lamp.
Further, the measuring unit further includes Measurement and Control System, and the Measurement and Control System sends control signal
Control the opening and closing of the first solenoid valve, second solenoid valve, third solenoid valve.
Further, the Measurement and Control System is received by A/D conversion circuit and comes from photoelectric tube optical signal.
Further, the motor of the water pump is that synchronous AC motor is driven.
A kind of working method of Ultraviolet Photometric Method COD online analyzer, comprising the following steps:
Step 1: the first solenoid valve is opened, and is sampled pump work in fluid to be measured input measurement slot, is reached certain volume
When the first solenoid valve is automatically closed.
Step 2: with the measured medium in the ultraviolet light measuring flume of the predetermined light intensity of predetermined wavelength, and its transmission is measured
The light intensity I of ultraviolet light out;It is 546nm that wherein light intensity, which includes by the light intensity I1 of the optical filter of 254nm and by wavelength,
The light intensity I2 of optical filter.
Step 3: opening the first solenoid valve and the testing liquid in measuring flume is arranged to the flowing of the motor direction of water pump
Out;Second solenoid valve is opened, water pump will be demarcated in liquid input measurement slot.
Step 4: second solenoid valve is closed;With the calibration liquid in the ultraviolet light measuring flume of the predetermined light intensity of predetermined wavelength
Body, and measure the light intensity Io for the ultraviolet light that it is transmitted;Wherein light intensity include by the light intensity Io1 of the optical filter of 254nm with
Pass through the light intensity Io2 for the optical filter that wavelength is 546nm.
Step 5: the COD value of measured medium is calculated according to I0 and I.
Step 6: sampling terminates, and third solenoid valve is opened, and water pump will clean in cleaning liquid input measurement slot.
3. the utility model has the advantages that
(1) a kind of Ultraviolet Photometric Method COD online analyzer that this method proposes is distinguished using three different solenoid valves
Alternating controls different liquid and enters in measuring flume, and can overcome to measure caused by decaying as environment temperature and device influences,
Improve the Stability and veracity of apparatus measures.
(2) a kind of Ultraviolet Photometric Method COD online analyzer that this method proposes, the ultraviolet source used is wavelength 254nm
Cold cathode UV lamp is as main light source.Simultaneously for the influence for overcoming turbidity to measure COD, and introduce the monochrome of 546nm
Visible light is to compensate turbidity.
(3) synchronous AC motor has been selected to be driven in the method, it can be real under the control of control measuring system
The positive and negative rotation and stopping of existing motor, are more convenient the progress of detection work.
Detailed description of the invention
Fig. 1 is structural framing figure of the invention.
Specific embodiment
The present invention is specifically described with reference to the accompanying drawing.
As shown in Fig. 1, a kind of Ultraviolet Photometric Method COD online analyzer, it is characterised in that: the Ultraviolet Photometric Method COD
In-line analyzer includes filter device, the first solenoid valve, second solenoid valve, third solenoid valve, water pump, measuring unit, measuring flume;
Testing liquid is connected by pipeline with the first solenoid valve by pipeline by filter device, filter device, the first solenoid valve passes through
Pipeline is connected with water pump, and water pump is connected by pipeline with measuring flume;It demarcates liquid and second solenoid valve is passed through by pipeline;Second electricity
Magnet valve is connected by pipeline with water pump, and water pump is connected by pipeline with measuring flume;Cleaning liquid passes through third electromagnetism by pipeline
Valve is connected;Third solenoid valve is connected by pipeline with water pump, and water pump is connected by pipeline with measuring flume;Setting in the measuring flume
Ultraviolet source;The ultraviolet light of the ultraviolet source transmitting passes through the liquid in measuring flume and is measured unit reception.
Further, the measuring unit includes photoelectric tube;The photoelectric tube receives the purple of the liquid in measuring flume
Outer light.
Further, the photoelectric tube is two, and respectively work photoelectric tube and auxiliary photoelectric tube;The work photoelectric tube
Surface covers the optical filter that wavelength is 254nm;The optical filter that the fill-in light vessel surface covering wavelength is 546nm.
Further, the ultraviolet source is cold cathode UV lamp.
Further, the measuring unit further includes Measurement and Control System, and the Measurement and Control System sends control signal
Control the opening and closing of the first solenoid valve, second solenoid valve, third solenoid valve.
Further, the Measurement and Control System is received by A/D conversion circuit and comes from photoelectric tube optical signal.
Further, the motor of the water pump is that synchronous AC motor is driven.
Specific derivation process to measure COD in the present apparatus below.
According to " Lang Pa-Bill " law, in the case where not considering turbidity in sample
CODuv=Ka*A254=Ka*Ln(I254-0/I254) ----(5)
Wherein: the COD value for CODuv ~ be calculated by ultraviolet absorptivity;
The proportionality coefficient of Ka ~ absorbance and COD; A254~ 254nm ultraviolet absorptivity;
I254-0~ pass through the light intensity of blank sample;I254~ pass through the light intensity of sample;
When considering the influence of turbidity, ultraviolet absorptivity at 254nm not only has the contribution of COD, having includes turbidity
Contribution, it may be assumed that
A254= A254C + A254Z
Among these: A254C--- --- ultraviolet absorptivity as caused by COD
A254Z--- --- ultraviolet absorptivity as caused by turbidity
In order to compensate influence caused by turbidity, the absorbance as caused by turbidity should be subtracted from total absorbance, it may be assumed that
A254C=A254-A254Z----(6)
Again according to formula (4) formula, 254nm can be substituted with absorbance of the 546nm to turbidity to the absorbance of turbidity, it may be assumed that
A254Z =Kb*A546Z=Kb*Ln(I546-0/ I546) ----(7)
By formula (5), (6) and (7) are available:
CODuv=Ka*(A254- Kb*A546Z)
=Ka*〔Ln(I254-0/I254)- Kb*Ln(I546-0/I546)) ----(8)
By formula (8), it will thus be seen that in order to calculate CODuv, need to measure the light of the 254nm and 546nm in blank sample
According to intensity I254-0And I546-0, then measure the intensity of illumination I of 254nm and 546nm in sample254And I546, and with above-mentioned
Based on four data, CODuv is acquired according to formula (8)[4]。
Although the present invention has been described by way of example and in terms of the preferred embodiments, they be not it is for the purpose of limiting the invention, it is any ripe
This those skilled in the art is practised, without departing from the spirit and scope of the invention, can make various changes or retouch from working as, therefore guarantor of the invention
Shield range should be subject to what claims hereof protection scope was defined.
Claims (7)
1. a kind of Ultraviolet Photometric Method COD online analyzer, it is characterised in that: the Ultraviolet Photometric Method COD online analyzer includes
Filter device, the first solenoid valve, second solenoid valve, third solenoid valve, water pump, measuring unit, measuring flume;
Testing liquid is connected with the first solenoid valve by filter device, filter device by pipeline by pipeline, the first solenoid valve
It is connected by pipeline with water pump, water pump is connected by pipeline with measuring flume;
It demarcates liquid and second solenoid valve is passed through by pipeline;Second solenoid valve is connected by pipeline with water pump, and water pump passes through pipeline
It is connected with measuring flume;
Cleaning liquid is connected by pipeline by third solenoid valve;Third solenoid valve is connected by pipeline with water pump, and water pump passes through
Pipeline is connected with measuring flume;
Ultraviolet source is set in the measuring flume;The ultraviolet light of the ultraviolet source transmitting passes through the liquid in measuring flume and is measured
Unit receives.
2. a kind of Ultraviolet Photometric Method COD online analyzer according to claim 1, it is characterised in that: the measuring unit
Including photoelectric tube;The photoelectric tube receives the ultraviolet light of the liquid in measuring flume.
3. a kind of Ultraviolet Photometric Method COD online analyzer according to claim 2, it is characterised in that: the photoelectric tube is
Two, respectively work photoelectric tube and auxiliary photoelectric tube;The optical filter that the work photoelectricity pipe surface covering wavelength is 254nm;
The optical filter that the fill-in light vessel surface covering wavelength is 546nm.
4. a kind of Ultraviolet Photometric Method COD online analyzer according to claim 2, it is characterised in that: the ultraviolet source
For cold cathode UV lamp.
5. a kind of Ultraviolet Photometric Method COD online analyzer according to claim 2, it is characterised in that: the measuring unit
It further include Measurement and Control System, the Measurement and Control System sends control signal and controls the first solenoid valve, second solenoid valve, third
The opening and closing of solenoid valve.
6. a kind of Ultraviolet Photometric Method COD online analyzer according to claim 5, it is characterised in that: the measurement control
System is received by A/D conversion circuit and comes from photoelectric tube optical signal.
7. a kind of Ultraviolet Photometric Method COD online analyzer according to claim 1, it is characterised in that: the electricity of the water pump
Motivation is that synchronous AC motor is driven.
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Cited By (1)
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CN109142260A (en) * | 2018-09-26 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of Ultraviolet Photometric Method COD online analyzer and its working method |
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CN109142260A (en) * | 2018-09-26 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of Ultraviolet Photometric Method COD online analyzer and its working method |
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