CN210109066U - Nitrogen dynamic gas distribution method spot check system - Google Patents
Nitrogen dynamic gas distribution method spot check system Download PDFInfo
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- CN210109066U CN210109066U CN201822265477.9U CN201822265477U CN210109066U CN 210109066 U CN210109066 U CN 210109066U CN 201822265477 U CN201822265477 U CN 201822265477U CN 210109066 U CN210109066 U CN 210109066U
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Abstract
The utility model relates to a nitrogen gas dynamic distribution method spot check system belongs to environmental protection monitoring technology field. The utility model discloses a zero gas supply device, mark gas supply device, three-way valve and distribution device and gas storage device more than a set of, zero gas supply device includes the nitrogen gas bottle, the output of nitrogen gas bottle loops through the first port of first relief pressure valve, first check valve, first solenoid valve and three-way valve and is linked together, mark gas supply device includes mark gas bottle, the output of mark gas bottle loops through the first port of second relief pressure valve, second check valve, second solenoid valve and three-way valve and is linked together, distribution device is including distribution water tank and graduated flask, be provided with the level gauge in the graduated flask, gas storage device includes gas storage water tank. The utility model discloses mark gas needn't change frequently, mark gas quantity reduces substantially and mark gas concentration can set for at will between 0~ QB, makes the random of spot check concentration can follow, really realizes random spot check.
Description
Technical Field
The utility model relates to an automatic spot check system that carries out long-range spot check, control to flue gas on-line monitoring system belongs to environmental protection monitoring technology field.
Background
In order to monitor pollution source enterprises, an environmental protection competent department usually installs an online flue gas Monitoring System (CEMS, an abbreviation of Continuous Emission Monitoring System) in the pollution source enterprises, wherein the CEMS includes a flue gas preprocessing subsystem, a flue gas Monitoring subsystem and a data processing and communication subsystem;
the flue gas monitoring subsystem completes gaseous pollutant monitoring, particulate matter detection and flue gas parameter monitoring. The monitoring of the gaseous pollutants is mainly used for monitoring the concentration and emission of the gaseous pollutants SO2, NOX and the like; the particle detection is mainly used for detecting the concentration and the total emission amount of smoke dust; the flue gas parameter monitoring is mainly used for measuring flue gas flow rate, flue gas temperature, flue gas pressure, flue gas oxygen content, flue gas humidity and the like, and is used for calculating the total emission amount and converting related concentration; the data acquisition processing and communication subsystem is composed of a data acquisition unit and a computer, acquires various parameters in real time, generates dry basis, wet basis and converted concentration corresponding to various concentration values, generates the accumulated discharge amount of the day, the month and the year, completes the compensation of lost data and transmits a report to an environmental protection administrative department in real time.
In order to conceal the real situation of sewage discharge, pollution source enterprises often move about on the CEMS by cheating means, and the sewage discharge data uploaded by the CEMS do not exceed the standard, so that the inspection and punishment of environmental protection administrative departments are avoided.
In view of the above problems, the patent publication No. CN104237473 a provides a solution, but the standard gas in the proposed solution is a gas with static concentration, so that the following problems are derived:
1) the standard gas is inconvenient to replace; because the standard gas concentration is set when the standard gas bottle is purchased, if the CEMS parameter or the emission standard installed by a pollution discharge manufacturer changes and the spot check parameter needs to be set again, the standard gas bottle needs to be replaced on site;
2) the use amount of standard gas is large; under the condition that the standard gas is not expired, the use duration of the standard gas is mainly related to the capacity of the gas cylinder;
3) the standard gas is inconvenient to use; under the condition that the gas cylinder is not replaced, the environmental protection department can only carry out spot check by using the concentration specified by standard gas, and the randomness is not large; and after knowing the standard gas concentration, the pollution discharge manufacturer can completely correct the CEMS parameters with the tampered parameters to enable the CEMS parameters to output real values near the standard gas concentration value, so that the law enforcement efficiency is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a selective checking system of a nitrogen dynamic gas distribution method;
the utility model provides an above-mentioned technical problem adopt technical scheme as follows:
the utility model comprises a zero gas supply device, more than one group of standard gas supply devices, a three-way valve, a gas distribution device and a gas storage device,
the zero gas supply device comprises a nitrogen cylinder, the output end of the nitrogen cylinder is communicated with the first port of the three-way valve through a first pressure reducing valve, a first one-way valve and a first electromagnetic valve in sequence,
the standard gas supply device comprises a standard gas bottle, the output end of the standard gas bottle is communicated with the first port of the three-way valve through a second reducing valve, a second one-way valve and a second electromagnetic valve in sequence,
the air distribution device comprises an air distribution water tank and a measuring cylinder, a liquid level meter is arranged in the measuring cylinder, the air distribution water tank is communicated with the bottom end of the measuring cylinder, the air distribution water tank is communicated with a second port of the three-way valve,
the air storage device comprises an air storage water tank, an air bag limiting device is arranged in a liquid area in the air storage water tank, an air outlet end and an air inlet end are arranged on two sides of the air storage water tank respectively, the air inlet end of the air storage water tank is communicated with a third port of the three-way valve, the air outlet end of the air storage water tank is communicated with a standard gas output port and an evacuation port respectively, a third electromagnetic valve is arranged between the air outlet end of the air storage water tank and the standard gas output port, and a fourth electromagnetic valve is arranged between the air outlet end of the air storage water tank and the evacuation port.
The output end of the nitrogen cylinder is provided with a first pressure sensor, and the output end of the standard gas cylinder is provided with a second pressure sensor.
The air bag limiting device is a partition plate.
The air bag limiting device is made of adhesive, and the adhesive is arranged on the inner wall of the air storage water tank.
The utility model discloses an actively the effect as follows:
(1) the standard gas does not need to be replaced frequently; the gas cylinder does not need to be replaced on site due to the pollution discharge manufacturer;
(2) the consumption of standard gas is greatly reduced; because the standard gas concentration (QB) is dozens of times or even dozens of times of the required standard gas concentration, the dosage of the standard gas is proportionally reduced under the condition of the same use environment;
(3) the standard gas concentration can be set randomly between 0 and QB, so that the random spot check concentration can be irregularly circulated, and the random spot check is really realized.
Drawings
Fig. 1 is a block diagram of the present invention.
Detailed Description
As shown in the attached figure 1, the utility model adopts two bottles of high-concentration pollutant gas as an example,
the utility model comprises a zero gas supply device 1, more than one group of standard gas supply devices 2, a three-way valve 3, a gas distribution device 4 and a gas storage device 5,
the zero gas supply device 1 comprises a nitrogen gas bottle 1-1, the output end of the nitrogen gas bottle 1-1 is communicated with the first port of a three-way valve 3 through a first pressure reducing valve 1-3, a first one-way valve 1-4 and a first electromagnetic valve 1-5 in sequence,
the standard gas supply device 2 comprises a standard gas bottle 2-1, the output end of the standard gas bottle 2-1 is communicated with the first port of the three-way valve 3 through a second pressure reducing valve 2-3, a second one-way valve 2-4 and a second electromagnetic valve 2-5 in sequence,
the air distribution device 4 comprises an air distribution water tank 4-1 and a measuring cylinder 4-2, a liquid level meter 4-3 is arranged in the measuring cylinder 4-2, the air distribution water tank 4-1 is communicated with the bottom end of the measuring cylinder 4-2, the air distribution water tank 4-1 is communicated with a second port of the three-way valve 3,
the gas storage device 5 comprises a gas storage water tank 5-1, a gas bag limiting device is arranged in a liquid area in the gas storage water tank 5-1, a gas outlet end and a gas inlet end are respectively arranged on two sides of the gas storage water tank 5-1, the gas inlet end of the gas storage water tank 5-1 is communicated with a third port of a three-way valve 3, the gas outlet end of the gas storage water tank 5-1 is respectively communicated with a standard gas outlet 5-3 and an emptying port 5-4, a third electromagnetic valve 5-2 is arranged between the gas outlet end of the gas storage water tank 5-1 and the standard gas outlet 5-3, and a fourth electromagnetic valve 5-4 is arranged between the gas outlet end of the gas storage water tank 5-1 and the emptying port 5-5.
The output end of the nitrogen cylinder 1-1 is provided with a first pressure sensor 1-2, and the output end of the standard gas cylinder 2-1 is provided with a second pressure sensor 2-2.
The air bag limiting device is a partition plate 5-2 or an adhesive arranged on the inner wall of the air storage water tank 5-1.
The air storage water tank (an air bag is fixed in the air storage water tank) is respectively provided with an air distribution tank A and an air distribution tank B, wherein the air distribution tank A is used for air distribution and is in a closed form, and an air path interface and a water path interface are reserved; the gas storage tank B is used for storing gas and is in a semi-closed form, and two gas path interfaces are reserved, and the gas capacity of the gas storage tank B is larger than that of the gas storage water tank A;
the capacity of the measuring cylinder is not less than 2L, the bottom of the measuring cylinder is provided with an interface, the shape of the measuring cylinder is required to be a regular cylinder or a cuboid, and the slender type is better;
the liquid level meter can output 4-20 mA signals, can be placed in the measuring cylinder and does not influence the uniformity of the measuring cylinder;
the micro vacuum pump requires an output pressure of at least 1.2Bar (capable of supporting 2 meters of water column);
the air filtering device can filter moisture and dust in air.
The circuit part is substantially the same as that of patent publication No. CN 104237473A.
The working principle of the utility model is as follows:
the water path interface of the distribution water tank is connected with the interface of the measuring cylinder, the air path interface is connected with the common port of the three-way electromagnetic valve, the normally closed port of the three-way valve is an air inlet, and the normally open port of the three-way valve is an air outlet. When the air bag is inflated, the air bag is expanded, water in the air distribution water tank is extruded into the measuring cylinder, and the measuring cylinder is a regular cylinder or a cuboid, so that the volume of gas in the air storage water tank is in direct proportion to the liquid level in the measuring cylinder, and the calculated volume of the gas is only related to the uniformity of the measuring cylinder and the precision of the liquid level meter. Because the fluid can form vortex when being filled into the container under pressure, the effect can be utilized to realize the uniform mixing of different fluids. After the inflation is finished, the three-way valve can be switched, gas in the gas distribution water tank can be extruded into the gas storage water tank by liquid in the measuring cylinder, and in the process, the fluid can be uniformly mixed for the second time. The gas in the gas storage water tank is extruded by the water in the gas storage water tank, is discharged through the outlet, passes through the standard gas controller and reaches the gas inlet of the CEMS.
Based on above-mentioned working process, the product precision mainly receives the degree of consistency of graduated flask, the precision of level gauge and the pressure of water several aspects relevant:
1) the uniformity of the measuring cylinder; besides selecting a measuring cylinder with good uniformity, the influence caused by the uniformity can be reduced through sectional calibration;
2) the accuracy of the level gauge; because this scheme relies on the height of liquid level to control the ventilation volume, so the precision and the sensitivity of level gauge are the biggest to the influence of concentration, and under the precision and the sensitivity had been the optimum condition, sensitivity can be corrected through the procedure, and the influence that the precision was brought can be calculated through following formula:
the precision of setting the level gauge is Jmm, the liquid level difference before and after air distribution is Hmm, the liquid level difference of standard gas is Hb mm, the dilution multiple is XB, then the maximum error occurs when standard gas is introduced and positive deviation is taken, and when zero gas is introduced, negative deviation is taken, at this moment, the total height difference is still H, and the real concentration becomes:
Nz=(Hb+J)/H; （5-1）
the theoretical concentration should be:
Nl=Hb/H; （5-2）
the standard gas concentration deviation is as follows:
Pb=(Nz-Nl)/Nl=Nz/Nl-1=(Hb+J)/Hb-1=J/Hb; （5-3）
therefore, the accuracy is also related to the mapped liquid level difference Hb of the standard gas amount, Hb is inversely proportional to the dilution multiple XB and the cross section area S of the measuring cylinder, so that the concentration deviation Pb is proportional to XB and S, and the requirements are as follows: the measuring cylinder is preferably slender, and the dilution multiple cannot be too large; assuming that the dilution multiple is 10 and the liquid level difference before and after gas distribution is 500mm, then:
Pb=J/50; （5-3）
namely: every 1mm deviation will bring about 2% error. And due to the limitation of the volume of the equipment, the liquid level difference of 500mm is close to the limit, and the error caused by the liquid pressure is larger when the liquid level difference is larger. In order to ensure that the linear interval is as large as possible, it is required that: the precision of the liquid level meter must be within 1 mm;
3) pressure of water: a liquid level difference of 500mm corresponds to approximately 0.05 atmosphere, calculated at standard atmospheric pressure for a 10 meter high water column.
The air distribution process is that the standard air is introduced firstly and then the zero air is introduced, the water pressure is low when the standard air is introduced and the water pressure is high when the zero air is introduced. Therefore, the water pressure theoretically causes negative deviation, and the deviation can be corrected by a program because the variation of the water level can be measured;
the correction basis is as follows: pressure is inversely proportional to volume according to the ideal gas state equation pV = nRT.
In this example, the volume of gas is measured by a measuring cylinder, so the gas equation of state evolves as follows:
pHS=nRT；
pH=nRT/s；
further, since the distribution process is generally less than one minute, the temperature can be considered to be constant during the distribution process, and the main component of the standard gas is nitrogen, and when nitrogen is also used as the zero gas, nRT/s can be regarded as a constant C, and the relationship between the pressure and the liquid level difference is as follows:
pH=C;
setting the liquid level difference before and after the standard gas is introduced as HCs, and the pressure born by the air bag as Ps. When zero gas is introduced, the liquid level continues to rise, the pressure born by the air bag is increased, namely the volume of the standard gas is gradually reduced, and the converted height of the air bag after zero gas introduction can be calculated according to the following formula:
HCr*Pr=HCs*Ps
namely: HCr (Ps + HCa/10000) = HCs Ps
Therefore, the method comprises the following steps: hr = HCs Ps/(Ps + HCa/10000)
In the above formula, HCa is the calculated liquid level difference of zero gas, and the dilution multiple of standard gas is X;
(HCa+Hr)/Hr=X
namely: HCa/Hr = X-1
Namely: HCa/(HCs × Ps/(Ps + HCa/10000)) = X-1
Namely: HCa2/10000+ Ps HCa- (X-1) (HCs Ps) =0 (5-4)
Solving the unitary quadratic equation to obtain the value of HCa, namely determining the value of the stopping liquid level of the zero gas after the standard gas is introduced;
similarly, the above formula can also be used in the calculation of the mixture standard gas, and the result can be obtained by only treating the standard gas which is introduced later as zero gas, calculating the ratio constant between the two standard gases, and substituting the ratio constant into X in the formula.
Claims (4)
1. A spot check system of nitrogen dynamic gas distribution method is characterized in that the spot check system comprises a zero gas supply device (1), more than one group of standard gas supply devices (2), a three-way valve (3), a gas distribution device (4) and a gas storage device (5),
the zero gas supply device (1) comprises a nitrogen gas bottle (1-1), the output end of the nitrogen gas bottle (1-1) is communicated with the first port of the three-way valve (3) through a first reducing valve (1-3), a first one-way valve (1-4) and a first electromagnetic valve (1-5) in sequence,
the standard gas supply device (2) comprises a standard gas bottle (2-1), the output end of the standard gas bottle (2-1) is communicated with the first port of the three-way valve (3) through a second reducing valve (2-3), a second one-way valve (2-4) and a second electromagnetic valve (2-5) in sequence,
the air distribution device (4) comprises an air distribution water tank (4-1) and a measuring cylinder (4-2), a liquid level meter (4-3) is arranged in the measuring cylinder (4-2), the air distribution water tank (4-1) is communicated with the bottom end of the measuring cylinder (4-2), the air distribution water tank (4-1) is communicated with a second port of the three-way valve (3),
the gas storage device (5) comprises a gas storage water tank (5-1), a gas bag limiting device is arranged in a liquid area in the gas storage water tank (5-1), the two sides of the gas storage water tank (5-1) are respectively provided with a gas outlet end and a gas inlet end, the gas inlet end of the gas storage water tank (5-1) is communicated with the third port of the three-way valve (3), the air outlet end of the air storage water tank (5-1) is respectively communicated with a standard air outlet (5-3) and an emptying port (5-5), a third electromagnetic valve (5-2) is arranged between the air outlet end of the air storage water tank (5-1) and the standard gas outlet (5-3), a fourth electromagnetic valve (5-4) is arranged between the air outlet end of the air storage water tank (5-1) and the evacuation port (5-5).
2. The system for spot check of the dynamic gas distribution method of the nitrogen according to the claim 1, characterized in that the output end of the nitrogen cylinder (1-1) is provided with a first pressure sensor (1-2), and the output end of the standard gas cylinder (2-1) is provided with a second pressure sensor (2-2).
3. A system for spot-checking a dynamic distribution of nitrogen according to claim 1 or 2, wherein said air bag restraint means is a baffle.
4. The system for spot check of dynamic gas distribution of nitrogen as claimed in claim 1 or 2, wherein the air bag limiting device is an adhesive, and the adhesive is disposed on the inner wall of the gas storage water tank (5-1).
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| CN109709274A (en) * | 2018-12-31 | 2019-05-03 | 河北银发瑞洁环境科技有限公司 | A kind of nitrogen Devince By Dynamic Gas Ration Method selective examination system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109709274A (en) * | 2018-12-31 | 2019-05-03 | 河北银发瑞洁环境科技有限公司 | A kind of nitrogen Devince By Dynamic Gas Ration Method selective examination system |
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