CN110426489A - Nitrogen Devince By Dynamic Gas Ration Method spot-check system - Google Patents
Nitrogen Devince By Dynamic Gas Ration Method spot-check system Download PDFInfo
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- CN110426489A CN110426489A CN201811653811.6A CN201811653811A CN110426489A CN 110426489 A CN110426489 A CN 110426489A CN 201811653811 A CN201811653811 A CN 201811653811A CN 110426489 A CN110426489 A CN 110426489A
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- valve
- standard gas
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- gas
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N2001/2893—Preparing calibration standards
Abstract
The present invention relates to a kind of nitrogen Devince By Dynamic Gas Ration Methods to spot-check system, belongs to environment monitoring technical field.The present invention includes standard gas feeding mechanism, the first triple valve, the second triple valve and the first air distributing device and the second air distributing device of zero gas feeding mechanism, one group or more, the zero gas feeding mechanism includes nitrogen cylinder, the output end of the nitrogen cylinder passes sequentially through first pressure sensor, the first pressure reducing valve, the first check valve and is connected with the first port of the first triple valve, the standard gas feeding mechanism includes standard gas bottle, and the output end of the standard gas bottle passes sequentially through second pressure sensor, the second pressure reducing valve, second one-way valve and is connected with the first port of the first triple valve.Standard gas of the present invention need not be replaced frequently, standard gas dosage significantly reduces and standard gas concentration can arbitrarily be set between 0 ~ QB, and making selective examination, concentration is irregular follows, and really realize random inspection.
Description
Technical field
The automatic selective examination system that the present invention relates to a kind of pair of smoke on-line monitoring systems remotely to be spot-check, monitors, belongs to
Environment monitoring technical field.
Background technique
Smoke on-line monitoring system is usually installed in pollution sources enterprise to monitor pollution sources enterprise by environmentally friendly authorities
(abbreviation CEMS, the i.e. abbreviation of Continuous Emission Monitoring System), CEMS include flue gas pretreatment
Subsystem, flue gas monitoring subsystem and data processing and communication subsystem；
Flue gas monitoring subsystem completes gaseous pollutant monitoring, particle analyte detection and Gas Parameters monitoring.Gaseous pollutant monitoring
It is mainly used for monitoring the concentration and discharge amount of gaseous pollutant SO2, NOX etc.；Particle analyte detection is mainly used to survey the concentration of flue dust
And total emission volumn；Gas Parameters monitoring is mainly used to measure flue gas flow rate, flue-gas temperature, flue gas pressures, flue gas oxygen content, flue gas
Humidity etc., for the calculating of total emission volumn and the conversion of related concentrations；Data acquisition process and communication subsystem are acquired by data
Device and computer are constituted, and acquire parameters in real time, are generated the corresponding butt of each concentration value, wet basis and are converted concentration, generation day,
Report is simultaneously real-time transmitted to environmentally friendly authorities by the accumulation discharge amount of the moon, year, the compensation for completing to lose data.
Pollution sources enterprise juggles things on CEMS often through fraudulent means in order to conceal the truth of blowdown, is
The blowdown flow rate data that CEMS is uploaded are not exceeded, to escape the inspection and punishment of environmentally friendly authorities.
In view of the above-mentioned problems, the patent of publication number CN 104237473A provides solution, but its suggest plans in mark
Gas is the gas of static concentration, so derives following problem:
1) standard gas replacement is inconvenient；Because standard gas concentration has been set when buying standard gas bottle, if the CEMS ginseng that blowdown producer is filled
Several or discharge standard changes, and when needing to reset selective examination parameter, then must arrive scene replacement standard gas bottle；
2) standard gas usage amount is big；In the case where standard gas is not out of date, the duration that standard gas uses is mainly related with gas cylinder capacity；
3) standard gas is inconvenient for use；In the case where gas cylinder is not replaced, environmental protection administration can only use the concentration of standard gas defined to carry out
Selective examination, randomness are little；And blowdown producer can correct the CEMS ginseng for having tampered with parameter after learning standard gas concentration completely
Number, makes it export true value near standard gas concentration value, so lessens the efficiency of law enforcement.
Summary of the invention
It is as follows using technical solution that the present invention solves above-mentioned technical problem:
The present invention includes zero gas feeding mechanism, one group or more of standard gas feeding mechanism, the first triple valve, the second triple valve and
One air distributing device and the second air distributing device,
The zero gas feeding mechanism includes nitrogen cylinder, and the output end of the nitrogen cylinder passes sequentially through first pressure sensor, first
Pressure reducing valve, the first check valve are connected with the first port of the first triple valve,
The standard gas feeding mechanism includes standard gas bottle, and the output end of the standard gas bottle passes sequentially through second pressure sensor, second
Pressure reducing valve, second one-way valve are connected with the first port of the first triple valve,
First air distributing device includes the first distribution water tank and the first graduated cylinder, is provided with the first liquid level in first graduated cylinder
Meter, the first distribution water tank are connected with the first graduated cylinder bottom end, the second end of the first distribution water tank and the first triple valve
The first port of mouth and the second triple valve is connected,
Second air distributing device includes the second distribution water tank and the second graduated cylinder, is provided with the second liquid level in second graduated cylinder
Meter, the second distribution water tank are connected with the second graduated cylinder bottom end, the inlet end and the first triple valve of the second distribution water tank
Third port and the second port of the second triple valve be connected,
The third port of second triple valve is connected with standard gas delivery outlet and evacuation port respectively.
The first solenoid valve, the second one-way valve and the one or three are provided between first check valve and the first triple valve
It is provided with second solenoid valve between port valve, third solenoid valve is provided between second triple valve and standard gas delivery outlet, it is described
The 4th solenoid valve is provided between second triple valve and evacuation port.
The positive effect of the present invention is as follows:
(1) standard gas need not be replaced frequently；Without again because the reason of blowdown producer, removes scene replacement gas cylinder；
(2) standard gas dosage significantly reduces；Because fiducial mark gas concentration (setting are as follows: QB) be more than ten times of required standard gas concentration even
Tens times, in the identical situation of use environment, dosage can be also proportionally reduced；
(3) standard gas concentration can arbitrarily be set between 0 ~ QB, and making selective examination, concentration is irregular follows, and really realize random inspection.
Detailed description of the invention
Attached drawing 1 is structural block diagram of the invention.
Specific embodiment
As described in Fig. 1, work is applied in combination as standard gas and nitrogen using the contaminant gases of a bottle height concentration in the present invention
For embodiment,
The present invention includes the standard gas feeding mechanism 2 for including 1, one group of zero gas feeding mechanism or more, the first triple valve 3, the second threeway
Valve 6 and the first air distributing device 4 and the second air distributing device 5,
The zero gas feeding mechanism 1 includes nitrogen cylinder 1-1, and the output end of the nitrogen cylinder 1-1 passes sequentially through first pressure sensing
Device 1-2, the first pressure reducing valve 1-3, the first check valve 1-4 are connected with the first port of the first triple valve 3,
The standard gas feeding mechanism 2 includes standard gas bottle 2-1, and the output end of the standard gas bottle 2-1 passes sequentially through second pressure sensing
Device 2-2, the second pressure reducing valve 2-3, second one-way valve 2-4 are connected with the first port of the first triple valve 3,
First air distributing device 4 includes setting in the first distribution water tank 4-1 and the first graduated cylinder 4-2, the first graduated cylinder 4-2
There are first liquid level gauge 4-3, the first distribution water tank 4-1 to be connected with the first bottom end graduated cylinder 4-2, the first distribution water tank 4-
1 is connected with the first port of the second port of the first triple valve 3 and the second triple valve 6,
Second air distributing device 5 includes setting in the second distribution water tank 4-1 and the second graduated cylinder 4-2, the second graduated cylinder 4-2
There are second liquid level gauge 4-3, the second distribution water tank 4-1 to be connected with the second bottom end graduated cylinder 4-2, the second distribution water tank 4-
1 inlet end is connected with the second port of the third port of the first triple valve 3 and the second triple valve 6,
The third port of second triple valve 6 is connected with standard gas delivery outlet 9 and evacuation port 10 respectively.
The first solenoid valve 1-5, the second one-way valve are provided between the first check valve 1-4 and the first triple valve 3
It is provided with second solenoid valve 2-5 between 2-4 and the first triple valve 3, is arranged between second triple valve 6 and standard gas delivery outlet 9
There is third solenoid valve 7, is provided with the 4th solenoid valve 8 between second triple valve 6 and evacuation port 10.
The graduated cylinder, capacity should be not less than 2L, bottom there are interface, shape need regular cylindrical body or cuboid,
Slender type is preferred；
The liquidometer, the liquidometer should be able to export 4 ~ 20mA signal, can be placed in graduated cylinder, and not influence the uniform of graduated cylinder
Degree；
The minipump, it is desirable that output pressure, which is at least 1.2Bar(, can support 2 meter water columns)；
The air filter can cross moisture and dust in air filtering.
The patent of its circuit part and patent publication No. CN104237473 A is substantially identical.
Working principle of the present invention is as follows:
Distribution process and principle:
The water route interface of distribution water tank and the interface of graduated cylinder connect, and the common port of air-path interface and three-way magnetic valve connects, threeway
The normally closed port of valve is air inlet, and normally open is gas vent.When the bladder inflates, air bag expands, and the water in distribution water tank is squeezed
To graduated cylinder, because graduated cylinder be rule cylindrical body or cuboid, therefore the liquid level in distribution water tank in the volume and graduated cylinder of gas at
Direct ratio, and the volume of gas calculated is only related with the precision of the uniformity of graduated cylinder and liquidometer.Because fluid is being under pressure
When being filled into container, vortex will form, the mixing of different fluid can be realized using this effect, until water level reaches specified altitude assignment,
Distribution terminates.Switching the state of distribution triple valve and exhaust three-way valve, then the state of air distributing device has been switched to exhaust condition,
The standard gas prepared is discharged by exhaust three-way valve, by standard gas controller, reaches the air inlet of CEMS.
Two sets of configuration devices supply principle in turn:
Defining two sets of air distributing devices is device A, device B；
Definition two triple valves used are distribution triple valve, exhaust three-way valve；
Connecting line as follows:
The common port of distribution triple valve is connected to gas source bus mouth, and the common port of exhaust three-way valve is connected to standard gas exhaust bus
Mouthful, the air-path interface of device A is connected to the normally open of distribution triple valve and the normally closed port of exhaust three-way valve, and the gas circuit of device B connects
Mouth is connected to the normally closed port of distribution triple valve and the normally open of exhaust three-way valve.
Gas supply process and principle:
1) original state is that device A, which is in, matches gaseity, and device B is in exhaust condition without gas in device A and device B；
2) start distribution program, target: device A；
3) after device A distribution, waiting device B exhaust is finished；
4) switch two triple valve states, then device A enters exhaust condition, and device B, which enters, matches gaseity；
5) start distribution program, target: device B;
6) after device B distribution, waiting device A exhaust is finished；
7) switch two triple valve states, then device B enters exhaust condition, and device A, which enters, matches gaseity；
8) step 2 is jumped to；
Based on the above-mentioned course of work, product precision is mainly several by the pressure of the uniformity of graduated cylinder, the precision of liquidometer and water
Aspect is related:
1) uniformity of graduated cylinder；In addition to the graduated cylinder of selection good evenness, it can also be brought by sectional calibration to reduce the uniformity
Influence；
2) precision of liquidometer；Because this programme is to control ventilatory capacity by the height of liquid level, therefore the precision of liquidometer and spirit
Influence of the sensitivity to concentration is the largest, and in the case where accuracy and sensitivity has been optimal, sensitivity can pass through program
It is corrected, and the influence of precision bring can be calculate by the following formula:
The precision of liquidometer is set as Jmm, the liquid level difference before and after distribution is Hmm, and standard gas liquid level difference is Hb mm, and extension rate is
XB, then worst error occurs to have walked overgauge in logical standard gas, and has walked minus deviation when logical zero gas, and at this moment total height difference is still
H, and true concentration becomes:
Nz=(Hb+J)/H;(5-1)
Theoretical concentration is answered are as follows:
Nl=Hb/H;(5-2)
Standard gas concentration deviation are as follows:
Pb=(Nz-Nl)/Nl=Nz/Nl-1=(Hb+J)/Hb-1=J/Hb;(5-3)
It can be seen that precision is also related with the mapping liquid level difference Hb of standard gas amount, and Hb and extension rate XB, graduated cylinder sectional area S at
Inverse ratio, therefore concentration deviation Pb is directly proportional to XB, S, therefore require: graduated cylinder is preferred with slender type, and extension rate cannot be too big；It is assumed that
Extension rate is 10, and the liquid level difference before and after distribution is 500mm, then:
Pb=J/50;(5-4)
That is: every increase 1mm deviation, it will bring 2% error.And limited by equipment volume, the liquid level difference of 500mm has connect
Near limit, and liquid level difference is bigger, error caused by fluid pressure also can be bigger.In order to guarantee that linearly interval is big as far as possible,
Therefore require: the precision of liquidometer must be within 1mm；
3) it the pressure of water: is calculated with corresponding 10 meters high of the water column of standard atmospheric pressure, the liquid level difference of 500mm is about as much as 0.05
A atmospheric pressure.
Distribution process is first logical standard gas, afterwards logical zero gas, and hydraulic pressure is low when leading to standard gas, and hydraulic pressure is high when leading to zero gas.Therefore hydraulic pressure is theoretical
On will cause minus deviation, because the variable quantity of water level can be surveyed, therefore the deviation available programs are modified；
Correct foundation: according to The Ideal-Gas Equation pV=nRT, pressure is inversely proportional with volume.
In this example, the volume of gas is to be measured with graduated cylinder, therefore equation of gas state differentiation is as follows:
pHS=nRT；
pH=nRT/s；
Further, because distribution process was less than one minute, temperature be may be considered constant in this process, and in standard gas
Main component is nitrogen, and if zero gas also uses nitrogen, and nRT/s can regard a constant C as, then pressure and liquid level difference
Relationship is as follows:
pH=C;
The liquid level difference before and after leading to standard gas is set as HCs, the pressure that air bag is born is Ps.In logical zero gas, liquid level continues to increase, gas
The pressure that capsule is born is increasing, that is to say, that the volume of its interior standard gas is being gradually reduced, and the conversion after having led to zero gas is high
Degree can calculate according to the following formula:
HCr*Pr=HCs*Ps
That is: HCr*(Ps+HCa/10000)=HCs*Ps
Therefore: Hr=HCs*Ps/(Ps+HCa/10000)
In above formula, HCa is the liquid level difference of zero gas calculated, it is assumed that the extension rate of standard gas is X, then；
(HCa+Hr)/Hr=X
That is: HCa/Hr=X-1
That is: HCa/ (HCs*Ps/ (Ps+HCa/10000))=X-1
That is: HCa2/10000+Ps*HCa- (X-1) (HCs*Ps)=0 (5-5)
The value of HCa can be obtained by solving the quadratic equation with one unknown, also can determine the termination liquid level of logical zero gas after having led to standard gas
Value；
Likewise, above formula can be used in the calculating of proportion mixing standard gas, rear logical standard gas need to only be treated as zero gas, be counted
Calculate between two kinds of standard gas with specific ray constant, the result that substitutes into the X of above formula that you can get it.
Claims (2)
1. a kind of nitrogen Devince By Dynamic Gas Ration Method spot-check system, it is characterised in that it includes the mark of zero gas feeding mechanism (1), one group or more
Gas feeding mechanism (2), the first triple valve (3), the second triple valve (6) and the first air distributing device (4) and the second air distributing device
(5),
The zero gas feeding mechanism (1) includes nitrogen cylinder (1-1), and the output end of the nitrogen cylinder (1-1) passes sequentially through first and subtracts
Pressure valve (1-3), the first check valve (1-4), the first solenoid valve (1-5) are connected with the first port of the first triple valve (3),
The standard gas feeding mechanism (2) includes standard gas bottle (2-1), and the output end of the standard gas bottle (2-1) passes sequentially through second and subtracts
Pressure valve (2-3), second one-way valve (2-4), second solenoid valve (2-5) are connected with the first port of the first triple valve (3),
First air distributing device (4) includes the first distribution water tank (4-1) and the first graduated cylinder (4-2), the first graduated cylinder (4-
2) it is provided with first liquid level gauge (4-3) in, the first distribution water tank (4-1) is connected with the bottom end the first graduated cylinder (4-2), described
First distribution water tank (4-1) is connected with the first port of the second port of the first triple valve (3) and the second triple valve (6),
Second air distributing device (5) includes the second distribution water tank (4-1) and the second graduated cylinder (4-2), the second graduated cylinder (4-
2) it is provided with second liquid level gauge (4-3) in, the second distribution water tank (4-1) is connected with the bottom end the second graduated cylinder (4-2), described
The second port of the inlet end of second distribution water tank (4-1) and the third port of the first triple valve (3) and the second triple valve (6)
It is connected,
The third port of second triple valve (6) is connected with standard gas delivery outlet (9) and evacuation port (10) respectively, and described
It is provided between two triple valves (6) and standard gas delivery outlet (9) third solenoid valve (7), second triple valve (6) and evacuation port
(10) the 4th solenoid valve (8) is provided between.
2. nitrogen Devince By Dynamic Gas Ration Method according to claim 1 spot-check system, it is characterised in that the nitrogen cylinder (1-1) it is defeated
Outlet is provided with first pressure sensor (1-2), and the output end of the standard gas bottle (2-1) is provided with second pressure sensor (2-
2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811653811.6A CN110426489A (en) | 2018-12-31 | 2018-12-31 | Nitrogen Devince By Dynamic Gas Ration Method spot-check system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811653811.6A CN110426489A (en) | 2018-12-31 | 2018-12-31 | Nitrogen Devince By Dynamic Gas Ration Method spot-check system |
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| Publication Number | Publication Date |
|---|---|
| CN110426489A true CN110426489A (en) | 2019-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811653811.6A Pending CN110426489A (en) | 2018-12-31 | 2018-12-31 | Nitrogen Devince By Dynamic Gas Ration Method spot-check system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238913A (en) * | 2020-01-20 | 2020-06-05 | 中国核电工程有限公司 | Device and method for preparing multi-component gas component containing water vapor |
-
2018
- 2018-12-31 CN CN201811653811.6A patent/CN110426489A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238913A (en) * | 2020-01-20 | 2020-06-05 | 中国核电工程有限公司 | Device and method for preparing multi-component gas component containing water vapor |
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