CN112326374A - Portable waste gas sampling and metering system and method - Google Patents

Portable waste gas sampling and metering system and method Download PDF

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Publication number
CN112326374A
CN112326374A CN202011282225.2A CN202011282225A CN112326374A CN 112326374 A CN112326374 A CN 112326374A CN 202011282225 A CN202011282225 A CN 202011282225A CN 112326374 A CN112326374 A CN 112326374A
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China
Prior art keywords
gas
oil
vacuum pump
flow
free vacuum
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Pending
Application number
CN202011282225.2A
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Chinese (zh)
Inventor
何仰朋
牛拥军
雷鸣
何育东
李兴华
余福胜
余昭
王定帮
石镇晶
孟令海
宦宣州
吴晓龙
郭浩然
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Application filed by Xian Thermal Power Research Institute Co Ltd, Xian Xire Boiler Environmental Protection Engineering Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202011282225.2A priority Critical patent/CN112326374A/en
Publication of CN112326374A publication Critical patent/CN112326374A/en
Pending legal-status Critical Current

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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
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/001—Means for regulating or setting the meter for a predetermined quantity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/005—Valves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention discloses a portable waste gas sampling and metering system and a method, which comprises a sample gas pipeline, a gas dryer, a sample gas pipeline, a flow regulating valve, a gas flowmeter, an electromagnetic valve, an oil-free vacuum pump, a waste gas exhaust port, a processor and a touch display screen, wherein the sample gas pipeline is connected with the gas dryer; the export of appearance gas pipeline is linked together with the entry of gas desicator, the export of gas desicator is linked together through flow control valve and gas flowmeter's entry, gas flowmeter's export is linked together through solenoid valve and oil-free vacuum pump's entry, oil-free vacuum pump's export is linked together with the waste gas vent, the treater is connected with flow control valve, gas flowmeter, solenoid valve and oil-free vacuum pump, the treater is connected with the touch-control display screen, the total waste gas volume that this system and method can accurate control waste gas flow and gather, and be convenient for carry.

Description

Portable waste gas sampling and metering system and method
Technical Field
The invention belongs to the technical field of pollutant control, and relates to a portable waste gas sampling and metering system and a method.
Background
The waste gas discharged from coal-fired boilers, metallurgy, waste incineration and fixed pollution sources in the chemical industry contains partial pollutants of various pollutants such as SO2、NOXThe flow and the like can display the content of the discharged pollutants on line in real time, and the on-line monitoring data and the like can basically reflect the discharge concentration and the discharge total amount of the corresponding pollutants; but part of the contaminants, e.g. SO3The online monitoring means such as HCl, condensable particles, dioxin and the like are deficient or the monitoring accuracy does not meet the requirements, so that the online monitoring of the emission concentration cannot be realized.Even if the pollutants with online concentration monitoring are realized, because the online monitoring sampling point can not reflect the concentration distribution of each part of the emission cross section in real time, the representativeness of online monitoring sampling and the accuracy of online monitoring data need to be compared and checked manually at regular intervals, the exhaust gas needs to be extracted, sampled and analyzed manually no matter the online monitoring pollutant concentration is checked or the pollutant concentration which is not monitored online is tested, and the flow control precision of the extracted exhaust gas and the accuracy of the collected total exhaust gas quantity have great influence on the measurement result of the field manual measurement of the pollutant concentration. The existing waste gas sampling and metering device for manually monitoring the concentration of pollutants on site has the following defects: 1) the volume flow of waste gas sampling is small, and the metering error of a common flowmeter is large; 2) the air extraction rate is not accurately controlled, and the fluctuation is large, so that the collection efficiency of the sampling equipment on pollutants is influenced; 3) the air extraction sampling metering equipment has a complex dispersion system, high operation requirement and easy fault occurrence and influences progress; 4) the site conditions are complex, the test position is high, and the instrument is time-consuming and labor-consuming to carry.
In order to improve the accuracy of the manual monitoring result of the pollutant emission concentration and enable the test result to represent the actual emission level of pollutants, the accuracy of analyzing and measuring the pollutant sample needs to be improved, and the accuracy of sampling and controlling the waste gas for measuring the pollutant concentration during manual field monitoring and the accuracy of measuring the amount of the sampled waste gas need to be improved. The on-site sampling metering device which is suitable for high-precision metering of low-flow gas and accurate in sampling flow control is developed, and the accuracy of a pollutant concentration measuring result monitored manually is improved; the sampling metering device is portable and flexible, can realize high intelligence and is easy to operate, and not only can greatly reduce the working intensity of field testing personnel, but also can reduce the human error of the field working personnel. Therefore, it is necessary to develop a portable integrated intelligent flow control and metering method and system for small-flow gas, which is suitable for manual sampling and monitoring of the concentration of pollutants in exhaust gas.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned shortcomings of the prior art, and providing a portable exhaust sampling and metering system and method, which can accurately control the flow rate of exhaust gas and the total amount of exhaust gas to be collected, and is convenient for transportation.
In order to achieve the purpose, the portable waste gas sampling and metering system comprises a sample gas pipeline, a gas dryer, a sample gas pipeline, a flow regulating valve, a gas flowmeter, an electromagnetic valve, an oil-free vacuum pump, a waste gas exhaust port, a processor and a touch display screen;
the export of appearance gas pipeline is linked together with the entry of gas desicator, and the export of gas desicator is linked together through flow control valve and gas flowmeter's entry, and gas flowmeter's export is linked together through solenoid valve and oil-free vacuum pump's entry, and oil-free vacuum pump's export is linked together with the exhaust gas vent, and the treater is connected with flow control valve, gas flowmeter, solenoid valve and oil-free vacuum pump, and the treater is connected with the touch-control display screen.
And a temperature monitoring instrument is arranged at an inlet of the gas dryer and is connected with the processor.
And a gas pressure monitoring instrument is arranged at an outlet of the oil-free vacuum pump, wherein the gas pressure monitoring instrument is connected with the processor.
The processor is connected with the flow regulating valve, the gas flowmeter, the electromagnetic valve and the oil-free vacuum pump through a first data line.
The processor is connected with the touch display screen through a second data line.
A portable exhaust gas sampling and metering method comprises the following steps:
the user inputs the set target sampling flow through the touch display screen, the electromagnetic valve, the flow regulating valve and the oil-free vacuum pump are opened simultaneously, the rotating speed of the oil-free vacuum pump is gradually increased, the sample gas after waste gas analysis or pollutant absorption enters the gas dryer through the sample gas pipeline for drying and dehumidifying treatment, then enters the gas flowmeter through the flow regulating valve for testing the gas flow and the total accumulated passing gas amount in a time period, then enters the oil-free vacuum pump through the electromagnetic valve, the sample gas output by the oil-free vacuum pump is discharged through the waste gas exhaust port, in the process, the processor regulates the opening degree of the flow regulating valve, the opening degree of the electromagnetic valve and the rotating speed of the oil-free vacuum pump according to the gas flow detected by the gas flowmeter and the set target sampling flow, so that the gas flow detected by the gas flowmeter is the same as the set target sampling flow, after the test is finished, the processor reads the total amount of the gas detected by the gas flowmeter and accumulated to pass through, and then the total amount of the gas is displayed through the touch display.
The invention has the following beneficial effects:
the portable waste gas sampling and metering system and the method of the invention suck the sample gas through the oil-free vacuum pump during the specific operation, the processor controls the flow regulating valve, the electromagnetic valve and the oil-free vacuum pump according to the sample gas flow detected by the gas flowmeter and the set target sampling flow, namely, the combination of coarse adjustment and fine adjustment is adopted, so that the sample gas flow is quickly equal to the set target sampling flow, the pollutant sampling or absorbing device connected at the front end is favorable for trapping pollutants, the pollutant sampling accuracy of the device is improved, after the test time is over, the processor reads the total gas amount accumulated by the sample gas flowmeter and displays the total gas amount through the touch display screen, thereby realizing the accurate control of the waste gas flow and the total collected waste gas amount, and the system has simple structure, convenient carrying and transportation, high integration and intellectualization, and reduces the requirement on the operation proficiency of field testers, human errors in the testing process are effectively reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is the touch-control display screen, 2 is the treater, 3 is temperature monitoring instrument, 4 is the gas desicator, 5 is flow control valve, 6 is gas flowmeter, 7 is gas pressure monitoring instrument, 8 is the solenoid valve, 9 is the oil-free vacuum pump, 10 is exhaust gas port.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the portable exhaust gas sampling and metering system of the present invention includes a sample gas pipeline, a gas dryer 4, a sample gas pipeline, a flow regulating valve 5, a gas flowmeter 6, an electromagnetic valve 8, an oil-free vacuum pump 9, an exhaust gas exhaust port 10, a processor 2 and a touch display screen 1; the export of appearance gas pipeline is linked together with the entry of gas desicator 4, and the export of gas desicator 4 is linked together through flow control valve 5 and gas flowmeter 6's entry, and gas flowmeter 6's export is linked together through solenoid valve 8 and oil-free vacuum pump 9's entry, and oil-free vacuum pump 9's export is linked together with exhaust gas vent 10, and treater 2 is connected with flow control valve 5, gas flowmeter 6, solenoid valve 8 and oil-free vacuum pump 9, and treater 2 is connected with touch display screen 1.
A temperature monitoring instrument 3 is arranged at an inlet of the gas dryer 4, and the temperature monitoring instrument 3 is connected with the processor 2; and a gas pressure monitoring instrument 7 is arranged at the outlet of the oil-free vacuum pump 9, wherein the gas pressure monitoring instrument 7 is connected with the processor 2.
The processor 2 is connected with the flow regulating valve 5, the gas flowmeter 6, the electromagnetic valve 8 and the oil-free vacuum pump 9 through a first data line; the processor 2 is connected with the touch display screen 1 through a second data line.
The portable waste gas sampling and metering method comprises the following steps:
the sample gas after being analyzed by waste gas or absorbed by pollutants enters a gas dryer 4 through a sample gas pipeline, wherein the processor 2 monitors the gas temperature at the inlet of the gas dryer 4 through a temperature monitoring instrument 3, the sample gas is dried and dehumidified through the gas dryer 4, then the flow of the sample gas is regulated through a flow regulating valve 5 and then is input into the flow regulating valve 5, the gas flow and the total accumulated passing gas in the testing time period are measured through a gas flowmeter 6, the sample gas output by the gas flowmeter 6 is subjected to secondary regulation through an electromagnetic valve 8 and then enters an oil-free vacuum pump 9, and finally the sample gas is discharged through a waste gas exhaust port 10;
when the sampling device works, a user inputs a set target sampling flow through the touch display screen 1, simultaneously opens the electromagnetic valve 8, the flow regulating valve 5 and the oil-free vacuum pump 9, gradually increases the rotating speed of the oil-free vacuum pump 9, obtains the temperature, the flow and the pressure of the sample gas, and regulates the opening degree of the electromagnetic valve 8, the opening degree of the flow regulating valve 5 and the rotating speed of the oil-free vacuum pump 9 according to the flow detection value of the sample gas, so that the flow detected by the gas flowmeter 6 is equal to the set target sampling flow until the sampling is finished, displays the total amount of the sample gas through the touch display screen 1, closes the electromagnetic valve 8 and the flow regulating valve 5, and simultaneously stops transporting;
in the sampling process, detect the temperature and the pressure of appearance gas through temperature monitoring instrument 3 and gas pressure monitoring instrument 7, when the temperature of appearance gas exceedes preset temperature range or when the pressure of appearance gas exceedes preset pressure range, then the initiative closes solenoid valve 8, stops transporting oil-free vacuum pump 9 simultaneously to the realization is to measuring equipment's protection.
It should be noted that the present invention takes into full account the gas principal component, e.g., O, during the gas flow measurement process2、N2And CO2And the like, and meanwhile, the flow control accuracy is improved, so that the gas flow metering accuracy is high, the integration level is high, the device is portable, the artificial error in the test process is reduced, and the working strength of instrument carrying is reduced.

Claims (6)

1. A portable waste gas sampling and metering system is characterized by comprising a sample gas pipeline, a gas dryer (4), a sample gas pipeline, a flow regulating valve (5), a gas flowmeter (6), an electromagnetic valve (8), an oil-free vacuum pump (9), a waste gas exhaust port (10), a processor (2) and a touch display screen (1);
the export of appearance gas pipeline is linked together with the entry of gas desicator (4), the export of gas desicator (4) is linked together through flow control valve (5) and the entry of gas flowmeter (6), the export of gas flowmeter (6) is linked together through solenoid valve (8) and the entry of oil-free vacuum pump (9), the export and exhaust gas vent (10) of oil-free vacuum pump (9) are linked together, treater (2) and flow control valve (5), gas flowmeter (6), solenoid valve (8) and oil-free vacuum pump (9) are connected, treater (2) are connected with touch display screen (1).
2. The portable exhaust gas sampling and metering system according to claim 1, characterized in that a temperature monitoring instrument (3) is provided at the inlet of the gas drier (4), the temperature monitoring instrument (3) being connected to the processor (2).
3. A portable exhaust gas sampling and metering system according to claim 1, wherein a gas pressure monitoring instrument (7) is provided at an outlet of the oil-free vacuum pump (9), wherein the gas pressure monitoring instrument (7) is connected to the processor (2).
4. The portable exhaust sampling and metering system of claim 1, wherein the processor (2) is connected with the flow regulating valve (5), the gas flow meter (6), the solenoid valve (8) and the oil-free vacuum pump (9) through a first data line.
5. The portable exhaust gas sampling and metering system according to claim 4, wherein the processor (2) is connected to the touch display screen (1) through a second data line.
6. A portable exhaust gas sampling and metering method is characterized by comprising the following steps:
the user inputs the set target sampling flow through the touch display screen (1), the electromagnetic valve (8) is opened, the flow regulating valve (5) and the oil-free vacuum pump (9) are opened simultaneously, the rotating speed of the oil-free vacuum pump (9) is gradually increased, sample gas after being analyzed by waste gas or absorbed by pollutants enters the gas dryer (4) through the sample gas pipeline for drying and dehumidifying treatment, then enters the gas flowmeter (6) through the flow regulating valve (5) for testing the gas flow and the total amount of gas passing through accumulatively, then enters the oil-free vacuum pump (9) through the electromagnetic valve (8), the sample gas output by the oil-free vacuum pump (9) is discharged through the waste gas exhaust port (10), in the process, the processor (2) regulates the opening degree of the flow regulating valve (5) according to the gas flow detected by the gas flowmeter (6) and the set target sampling flow, The opening degree of the electromagnetic valve (8) and the rotating speed of the oil-free vacuum pump (9) enable the gas flow detected by the gas flowmeter (6) to be the same as the set target sampling flow, and after the test is finished, the processor (2) reads the total accumulated passing gas amount detected by the gas flowmeter (6) and displays the total accumulated passing gas amount through the touch display (1).
CN202011282225.2A 2020-11-16 2020-11-16 Portable waste gas sampling and metering system and method Pending CN112326374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011282225.2A CN112326374A (en) 2020-11-16 2020-11-16 Portable waste gas sampling and metering system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011282225.2A CN112326374A (en) 2020-11-16 2020-11-16 Portable waste gas sampling and metering system and method

Publications (1)

Publication Number Publication Date
CN112326374A true CN112326374A (en) 2021-02-05

Family

ID=74318809

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011282225.2A Pending CN112326374A (en) 2020-11-16 2020-11-16 Portable waste gas sampling and metering system and method

Country Status (1)

Country Link
CN (1) CN112326374A (en)

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