CN109709275A - A kind of air Devince By Dynamic Gas Ration Method selective examination system - Google Patents
A kind of air Devince By Dynamic Gas Ration Method selective examination system Download PDFInfo
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- CN109709275A CN109709275A CN201811651992.9A CN201811651992A CN109709275A CN 109709275 A CN109709275 A CN 109709275A CN 201811651992 A CN201811651992 A CN 201811651992A CN 109709275 A CN109709275 A CN 109709275A
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Abstract
A kind of air Devince By Dynamic Gas Ration Method selective examination system.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.The present invention includes zero gas feeding mechanism, one group or more of standard gas feeding mechanism, triple valve and air distributing device and caisson, the zero gas feeding mechanism includes air cleaning unit, the air inlet of the air cleaning unit is connected with air-in, the gas outlet of the air cleaning unit passes sequentially through minipump and the first check valve is connected with the first port of triple valve, the outlet side of first check valve is connected through relief valve with zero gas delivery outlet, the standard gas feeding mechanism includes gas cylinder, the output end of the gas cylinder passes sequentially through pressure sensor, pressure reducing valve, second one-way valve is connected with the first port of 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, making selective examination, concentration is irregular follows, 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.
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, triple valve and air distributing device and gas storage dress
It sets,
The zero gas feeding mechanism includes air cleaning unit, and the air inlet of the air cleaning unit is connected with air-in
Logical, the gas outlet of the air cleaning unit passes sequentially through the first port of minipump and the first check valve and triple valve
It is connected, the outlet side of first check valve is connected through relief valve with zero gas delivery outlet,
The standard gas feeding mechanism includes gas cylinder, and the output end of the gas cylinder passes sequentially through pressure sensor, pressure reducing valve, the second list
It is connected to valve with the first port of triple valve,
The air distributing device includes distribution water tank and graduated cylinder, and liquidometer, the distribution water tank and amount are provided in the graduated cylinder
Cylinder bottom end is connected, and the distribution water tank is connected with the second port of triple valve,
The caisson includes gas storage water tank, is provided with air bag limiting device in liquid regions in the gas storage water tank, described
The two sides of gas storage water tank are respectively arranged with outlet side and inlet end, the inlet end of the gas storage water tank and the third port of triple valve
It is connected, the outlet side of the gas storage water tank is connected with standard gas delivery outlet and evacuation port respectively.
The air bag limiting device is partition or bonding agent, and the bonding agent is set on gas storage tank inner wall.
The first solenoid valve is provided between first check valve and triple valve, between the relief valve and zero gas delivery outlet
Be provided with third solenoid valve, between the second one-way valve and triple valve between be provided with second solenoid valve, the gas storage water tank
Outlet side and standard gas delivery outlet between be provided with the 4th solenoid valve, be arranged between the outlet side and evacuation port of the gas storage water tank
There is the 5th solenoid valve.
The air cleaning unit is made of ceramic filter, drying tube and more than one active carbon filter.
The ceramic filter, drying tube and active carbon filter sequence are set gradually.
The air cleaning unit is made of ceramic filter, akaline liquid and more than one active carbon filter.
The ceramic filter, akaline liquid and active carbon filter sequence are set gradually.
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 very
To 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, the present invention using the contaminant gases of two bottle height concentration as embodiment,
The present invention includes standard gas feeding mechanism 2, triple valve 3 and the air distributing device 4 and storage of 1, one group of zero gas feeding mechanism or more
Device of air 5,
The zero gas feeding mechanism 1 includes air cleaning unit 1-1, and the air inlet and air of the air cleaning unit 1-1 is defeated
Entrance 1-7 is connected, and the gas outlet of the air cleaning unit 1-1 passes sequentially through minipump 1-2 and the first check valve
1-3 is connected with the first port of triple valve 3, and the outlet side of the first check valve 1-3 is through relief valve 1-5 and zero gas delivery outlet
1-8 is connected,
The standard gas feeding mechanism 2 includes gas cylinder 2-1, and the output end of the gas cylinder 2-1 passes sequentially through pressure sensor 2-2, subtracts
Pressure valve 2-3, second one-way valve 2-4 are connected with the first port of triple valve 3,
The air distributing device 4 includes being provided with liquidometer 4-3 in distribution water tank 4-1 and graduated cylinder 4-2, the graduated cylinder 4-2, described
Distribution water tank 4-1 is connected with the bottom end graduated cylinder 4-2, and the distribution water tank 4-1 is connected with the second port of triple valve 3,
The caisson 5 includes gas storage water tank 5-1, is provided with partition, the storage in liquid regions in the gas storage water tank 5-1
The two sides of air water case 5-1 are respectively arranged with outlet side and inlet end, and the of the inlet end of the gas storage water tank 5-1 and triple valve 3
Three ports are connected, and the outlet side of the gas storage water tank 5-1 is connected with standard gas delivery outlet 5-3 and evacuation port 5-4 respectively.
The air bag limiting device is partition 5-2 or bonding agent, and the bonding agent is set on gas storage water tank 5-1 inner wall.
The first solenoid valve 1-4, the relief valve 1-5 and zero gas are provided between the first check valve 1-3 and triple valve 3
Third solenoid valve 1-6 is provided between delivery outlet 1-8, between the second one-way valve 2-4 and triple valve 3 between be provided with second
It is provided with the 4th solenoid valve 5-2 between the outlet side and standard gas delivery outlet 5-3 of solenoid valve 2-5, the gas storage water tank 5-1, it is described
The 5th solenoid valve 5-4 is provided between the outlet side and evacuation port 5-5 of gas storage water tank 5-1.
The air cleaning unit 1-1 is made of ceramic filter, drying tube and more than one active carbon filter.
The ceramic filter, drying tube and active carbon filter sequence are set gradually.
The air cleaning unit 1-1 is by ceramic filter, akaline liquid and more than one active carbon filter group
At.
The ceramic filter, akaline liquid and active carbon filter sequence are set gradually.
Industrial lye and sodium bicarbonate can be used in akaline liquid of the present invention.
The air cleaning unit 1-1 uses the following two kinds embodiment:
1, it is made of ceramic filter, drying tube and more than one active carbon filter.The ceramic filter, drying tube
And active carbon filter is sequentially communicated.
2, it is made of ceramic filter, akaline liquid and more than one active carbon filter.The ceramic filter,
Akaline liquid and active carbon filter are sequentially communicated.
The ceramic filter, akaline liquid and active carbon filter sequence are set gradually.
The gas storage water tank (fixing an air bag inside gas storage water tank), respectively air chest A and air chest B, wherein matching
Gas tank A is used for distribution, should be closed type, there are an air-path interfaces and a water route interface；Expansion box B is used for gas storage,
It is semiclosed form, stays the gas capacity there are two air-path interface and expansion box B should be bigger than gas storage water tank A；
The graduated cylinder, capacity should be not less than 2L, and bottom is elongated there are interface, shape need regular cylindrical body or cuboid
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 cleaning unit 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:
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 gas storage 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.After inflation, threeway can be switched
Valve, the gas in distribution water tank can be expressed in gas storage water tank by the liquid in graduated cylinder, and in this process, fluid will do it
Secondary mixing.Gas in gas storage water tank can be squeezed by the water in gas storage water tank, be discharged by mouth, by standard gas controller, arrived
Up to the air inlet of CEMS.
Based on the above-mentioned course of work, product precision is mainly by the pressure of the uniformity of graduated cylinder, the precision of liquidometer and water
Power several respects are 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;(5-3)
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 (5-4)
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 (9)
1. a kind of air 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), triple valve (3) and air distributing device (4) and caisson (5),
The zero gas feeding mechanism (1) includes air cleaning unit (1-1), the air inlet of the air cleaning unit (1-1) with
Air-in (1-7) is connected, and the gas outlet of the air cleaning unit (1-1) passes sequentially through minipump (1-2),
One check valve (1-3) and the first solenoid valve (1-4) are connected with the first port of triple valve (3),
The standard gas feeding mechanism (2) includes gas cylinder (2-1), and the output end of the gas cylinder (2-1) passes sequentially through, pressure reducing valve (2-
3), second one-way valve (2-4) and second solenoid valve (2-5) are connected with the first port of triple valve (3),
The air distributing device (4) includes distribution water tank (4-1) and graduated cylinder (4-2), is provided with liquidometer in the graduated cylinder (4-2)
(4-3), the distribution water tank (4-1) are connected with the bottom end graduated cylinder (4-2), and the of the distribution water tank (4-1) and triple valve (3)
Two-port netwerk is connected,
The caisson (5) includes gas storage water tank (5-1), is provided with air bag in the interior liquid regions of the gas storage water tank (5-1)
Limiting device, the two sides of the gas storage water tank (5-1) are respectively arranged with outlet side and inlet end, the gas storage water tank (5-1)
Inlet end is connected with the third port of triple valve (3), the outlet side of the gas storage water tank (5-1) respectively with standard gas delivery outlet
(5-3) and evacuation port (5-4) are connected, and are arranged between the outlet side and standard gas delivery outlet (5-3) of the gas storage water tank (5-1)
There is the 4th solenoid valve (5-2), is provided with the 5th solenoid valve between the outlet side and evacuation port (5-5) of the gas storage water tank (5-1)
(5-4).
2. a kind of air Devince By Dynamic Gas Ration Method according to claim 1 spot-check system, it is characterised in that the standard gas bottle (2-1)
Output end be provided with pressure sensor (2-2).
3. a kind of air Devince By Dynamic Gas Ration Method according to claim 2 spot-check system, it is characterised in that first check valve
The outlet side of (1-3) is connected through relief valve (1-5), third solenoid valve (1-3) with zero gas delivery outlet (1-8).
4. a kind of nitrogen Devince By Dynamic Gas Ration Method according to claim 3 spot-check system, it is characterised in that the air bag limit dress
It is set to partition (5-2).
5. a kind of nitrogen Devince By Dynamic Gas Ration Method according to claim 3 spot-check system, it is characterised in that the air bag limit dress
It is set to bonding agent, the bonding agent is set on gas storage water tank (5-1) inner wall.
6. a kind of air Devince By Dynamic Gas Ration Method selective examination system described in -5 any one according to claim 1, it is characterised in that described
Air cleaning unit (1-1) is made of ceramic filter, drying tube and more than one active carbon filter.
7. a kind of air Devince By Dynamic Gas Ration Method according to claim 6 spot-check system, it is characterised in that the ceramic filter,
Drying tube and active carbon filter sequence are set gradually.
8. a kind of air Devince By Dynamic Gas Ration Method selective examination system described in -5 any one according to claim 1, it is characterised in that described
Air cleaning unit (1-1) is made of ceramic filter, akaline liquid and more than one active carbon filter.
9. a kind of air Devince By Dynamic Gas Ration Method according to claim 8 spot-check system, it is characterised in that the ceramic filter,
Akaline liquid and active carbon filter sequence are set gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651992.9A CN109709275A (en) | 2018-12-31 | 2018-12-31 | A kind of air Devince By Dynamic Gas Ration Method selective examination system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651992.9A CN109709275A (en) | 2018-12-31 | 2018-12-31 | A kind of air Devince By Dynamic Gas Ration Method selective examination system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109709275A true CN109709275A (en) | 2019-05-03 |
Family
ID=66260482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811651992.9A Pending CN109709275A (en) | 2018-12-31 | 2018-12-31 | A kind of air Devince By Dynamic Gas Ration Method selective examination system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109709275A (en) |
-
2018
- 2018-12-31 CN CN201811651992.9A patent/CN109709275A/en active Pending
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