CN114459831B - Multichannel gas sampling measurement method with flow control - Google Patents
Multichannel gas sampling measurement method with flow control Download PDFInfo
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- CN114459831B CN114459831B CN202111661114.7A CN202111661114A CN114459831B CN 114459831 B CN114459831 B CN 114459831B CN 202111661114 A CN202111661114 A CN 202111661114A CN 114459831 B CN114459831 B CN 114459831B
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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
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a multichannel gas sampling measurement method with flow control, which comprises the following steps of S1: selecting a measurement point location; s2: selecting a filter cartridge; s3: starting the electronic equipment; s4: adjusting the flow to zero; s5: starting a sampling pump (9) and setting a flow initial value; s6: regulating the flow; s7: detecting gas; s8: the gas concentration value of the dry gas in the standard state is folded; s9: and (5) ending the sampling measurement. The method realizes that a set of sampling and measuring system can simultaneously, independently and continuously sample and measure the gas of a plurality of channels, saves a sampling pump used in the process of multi-channel simultaneous sampling and detection, reduces the cost and reduces the space occupied by equipment; in addition, flow control is regulated according to temperature, air pressure and humidity parameters, measurement accuracy is improved, and the measurement result is converted into a gas concentration value of standard dry gas, so that the measurement result is unified.
Description
Technical Field
The invention belongs to the field of gas sampling and measuring, and particularly relates to a multichannel gas sampling and measuring method with flow control.
Background
The gas sampling and detecting method is a core means used in the current environment-friendly on-line monitoring field. A pipeline is generally used to connect the detection cavity and a sampling pump, and the operation of the sampling pump enables the air inlet of the sampling pump to form negative pressure relative to the external environment, so that gas is pumped into the pipeline from the environment to be detected, and then enters the detection cavity. The content and composition of the characteristic substances contained in the gas are qualitatively and quantitatively analyzed by various physical or chemical methods.
Aiming at the use scenes that the measuring points are dense, a plurality of different gas parameters are required to be measured simultaneously and the installation space of equipment is limited, the requirements of the detectors used for the measured gas parameters on sample injection flow are different, so that the gases in a plurality of environments are required to be subjected to distributed sampling, the flow of each channel is independently controlled, and then the gases are concentrated on one piece of equipment for detection. According to a general solution, each gas detection channel uses a respective sampling pump and a sampling rotameter and a flow splitting rotameter are provided to control the flow. This approach allows for multiple channels of gas collection, but greatly increases the cost of installation and maintenance, and greatly increases the space occupied by the installation of the device sampling system. In addition, the influence of gas temperature, humidity and pressure parameters on detection is not considered in the prior art, the data of a measurement system are inaccurate, and the result display is not uniform.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-channel gas continuous sampling measurement method capable of independently adjusting flow, realizing that a set of sampling measurement system can simultaneously, independently and continuously sample and measure gas of a plurality of channels, adjusting flow control according to temperature, air pressure and humidity parameters, improving measurement accuracy, converting measurement results into gas concentration values of standard dry gas, and unifying measurement results.
The invention is realized by the following technical scheme:
a multi-channel gas sampling measurement method with flow control, the method utilizing a system comprising: the system comprises a man-machine interaction touch screen, a sampling pump, a controller, a multi-path sampling measurement unit, a gas diversion unit and a multi-path gas exhaust; each path of sampling and measuring unit comprises a sampling head, a filter, a first electronic flow controller, a detector, a temperature sensor, a pressure sensor and a humidity sensor; the gas diversion unit comprises a second electronic flow controller and a diversion gas pipeline; the sampling head, the filter, the first electronic flow controller and the detector are sequentially connected by using an air pipe; the multi-pipeline gas row is a cuboid box body, the top of the multi-pipeline gas row is provided with a plurality of gas-sampling ports, two side faces in the length direction are symmetrically provided with an opening respectively, one side of the multi-pipeline gas row is a gas outlet, the other side of the multi-pipeline gas row is a split-flow port, a gas channel is formed in the multi-pipeline gas row, and all the gas ports are connected into the gas channel; the gas sampling port of the multi-pipeline gas exhaust is connected with the detector through a gas pipe, and the temperature sensor, the pressure sensor and the humidity sensor are arranged in the section of gas pipe; the multi-pipeline gas exhaust port is connected with a sampling pump; the multi-pipeline gas discharge split port is connected with the second electronic flow controller of the gas split unit through a gas pipe; the air inlet of the second electronic flow controller is connected to the split flow inlet through the split flow air pipeline; the man-machine interaction touch screen, the first electronic flow controller, the detector and the second electronic flow controller are respectively connected with the controller;
the method comprises the following steps:
s1: selecting a measurement point location;
s2: selecting a filter cartridge;
s3: starting the electronic equipment;
s4: adjusting the flow to zero;
setting the flow of the first electronic flow controller and the second electronic flow controller to be zero through a human-computer interaction touch screen;
s5: starting a sampling pump, and setting a flow initial value;
setting the flow initial value of a first electronic flow controller of each sampling measurement unit as an expected value; setting the flow value of the second electronic flow controller so that each flow satisfies the relationship:
wherein: f (F) D The unit is L/min which is the flow of the diversion channel; f (F) p The unit is L/min for the rated flow of the sampling pump; f (F) di Measuring the channel flow for each sample in L/min;
s6: regulating the flow;
the controller calculates the standard dry gas flow of each sampling measurement channel according to the temperature, humidity and air pressure values acquired by each sampling measurement channel, transmits the calculation result to the man-machine interaction touch screen for display,
the standard dry gas flow is calculated as follows:
wherein: q (Q) n The dry gas flow rate is the unit L/min under the standard state; q is the measured gas flow of the first electronic flow controller, and the unit is L/min; t is the measured gas temperature in DEG C; b (B) a Is the local atmospheric pressure value, unit kPa; p is the measured gas pressure, unit kPa; x is X sw Is the measured gas moisture content;
readjusting the flow of the first electronic flow controller of the sampling measurement channel and the second electronic flow controller of the shunt channel to ensure that the standard dry gas flow meets the detection index requirement;
s7: detecting gas;
the detector detects the sampling gas to obtain a gas concentration value of the gas to be detected;
s8: the gas concentration value of the dry gas in the standard state is folded;
the formula of the folding calculation is as follows:
wherein: c (C) n Is the dry gas concentration in mg/m under standard condition 3 The method comprises the steps of carrying out a first treatment on the surface of the C is the measured gas concentration, mg/m 3 ；
S9: and (5) ending the sampling measurement.
The step S2 of selecting the filter element refers to selecting the type of the filter element according to the gas to be detected and selecting the aperture of the filter element according to the measurement requirement.
And an air pipe joint is arranged on an air port of the connecting air pipe of the multi-pipeline air exhaust.
And the idle sample gas port of the multi-pipeline gas exhaust is sealed by using a plug.
And a control switch of the sampling pump is connected with the controller.
The beneficial effects of the invention are as follows:
the invention provides a multi-channel gas continuous sampling measurement method capable of independently regulating flow, which realizes that a set of sampling measurement system can simultaneously and continuously sample and measure the gas of a plurality of channels, saves a sampling pump used in multi-channel simultaneous sampling detection, reduces the cost and reduces the space occupied by equipment; meanwhile, flow control is adjusted according to temperature, air pressure and humidity parameters, measurement accuracy is improved, and measurement results are converted into gas concentration values of standard dry gas, so that measurement results are unified.
Drawings
FIG. 1 is a schematic diagram of a gas sampling measurement system according to the present invention.
FIG. 2 is a flow chart of a gas sampling measurement method of the present invention.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings
FIG. 1 is a multi-channel gas sampling and measuring system with flow control according to an embodiment of the present invention, the system includes a sampling pump 9, a controller 10, a multi-channel sampling measuring unit, a gas diversion unit, a multi-channel gas vent 8; each path of sampling measurement unit comprises a sampling head 13, a filter 1, a first electronic flow controller 2, a detector 3, a temperature sensor 4, a pressure sensor 5 and a humidity sensor 6; the gas diversion unit comprises a second electronic flow controller (12) and a gas pipeline.
The filter 1 is connected to the sampling head 13 by a gas tube, typically a polytetrafluoroethylene gas tube. The filter 1, the first electronic flow controller 2, and the detector 3 are connected sequentially using a gas pipe. The filter 1 is used for filtering dust and liquid drops in the sample gas to protect the detector 3 from being polluted, and the service life and the detection effect of the detector 3 are ensured. The first electronic flow controller 2 is connected with the controller 10 through a communication port, stably controls the gas flow within a small range of a set flow value, and can read the real-time actual flow value. The multi-pipeline air exhaust is a cuboid box body, the top is provided with a plurality of sample air ports, two side faces in the length direction are symmetrically provided with an opening respectively, one side of the air port is an air outlet, the other side of the air port is a split-flow port, an air channel is formed inside the air port, all the air ports are connected into the air channel, all the openings are communicated, and an air pipe joint is arranged on the opening which needs to be connected with an air pipe.
The gas sampling port of the multi-pipeline gas row 8 is connected with the detector 3 through a gas pipe, and a temperature sensor 4, a pressure sensor 5 and a humidity sensor 6 are arranged in the connecting gas pipe. The air outlet of the multi-pipeline air exhaust 8 is connected with a sampling pump 9. The multi-pipeline gas exhaust 8 split port is connected with the second electronic flow controller 12 of the gas split unit through a gas pipe; the air inlet of the second electronic flow controller 12 is connected to the split inlet. The flow dividing unit is used for adjusting the relation between the sampling gas flow and the rated flow of the sampling pump 9, and ensuring that the sampling pump 9 works at rated power.
The solid line connection in the figure represents the tracheal connection and the dashed line connection in the figure represents the cable connection.
The idle sample gas port of the multi-pipeline gas row 8 is sealed by a plug 7, and in order to ensure the air tightness, the idle sample gas port is sealed by a sealing material such as polytetrafluoroethylene tape or thread compound.
The first electronic flow controller 2, the detector 3, the temperature sensor 4, the pressure sensor 5, the humidity sensor 6 and the second electronic flow controller 12 are respectively connected with the controller 10, and a control switch of the sampling pump 9 is connected with the controller 10.
Further, the multichannel gas sampling system further comprises a man-machine interaction touch screen 11, and the touch screen is connected with the controller 10, so that system control instruction input and working state display can be realized.
Fig. 2 is a flow chart of a multi-channel gas sampling measurement method capable of independently adjusting flow according to an embodiment of the invention. The method comprises the following specific steps:
s1: selecting a measurement point location;
and (3) aiming at monitoring a fixed emission source, placing a measurement point in an emission chimney, and aiming at monitoring the unorganized emission, placing the measurement point at a lower tuyere of a monitoring area.
S2: selecting a filter cartridge;
the appropriate filter cartridge type is selected based on the detected gas and the pore size of the filter cartridge is selected based on the measurement requirements. For example, for the measurement of gaseous contaminants, HEPA high efficiency filters or sintered metal filters are required, for certain specific gases (e.g. oxygen is measured using electrochemical principles), and for the removal of volatile organics effects on the measurement and damage to sensors, 4A molecular sieves can be used to filter moisture, volatile organics, acid gases, etc., to implement detector protection and filtering disturbances.
S3: starting the electronic equipment;
the system comprises a start man-machine interaction touch screen 11, a controller 10, a temperature sensor 4, a pressure sensor 5, a humidity sensor 6, a detector 3, a first electronic flow controller 2 and a second electronic flow controller 12.
S4: adjusting the flow to zero;
the flow of the first electronic flow controller 2 is set to be zero, and the flow of the second electronic flow controller 12 is set to be zero through the man-machine interaction touch screen 11.
S5: starting a sampling pump 9, and setting a flow initial value;
firstly, starting a sampling pump 9, and setting the flow of a first electronic flow controller 2 of each sampling measurement unit to be an expected value; the flow rate of the second electronic flow controller 2 is adjusted so that each flow rate satisfies the relationship:
wherein: f (F) D The unit is L/min which is the flow of the diversion channel; f (F) p The unit is L/min for the rated flow of the sampling pump; f (F) di Measuring the flow required by the channels for each sample, with the unit L/min;
s6: regulating the flow;
the controller 10 calculates the standard dry gas flow of each channel according to the temperature, humidity and air pressure values collected by each channel, compensates the measured values by using the temperature, humidity and air pressure, and then transmits the calculated results to the man-machine interaction touch screen 11 for display,
the standard dry gas flow is calculated as follows:
wherein: q (Q) n The dry gas flow rate is the unit L/min under the standard state; q is the measured gas flow, which is the measured value of the electronic flow controller 2, in L/min; t is the measured gas temperature in DEG C; b (B) a Is the local atmospheric pressure value, unit kPa; p is the measured gas pressure, unit kPa; x is X sw For the measured moisture content of the gas, the volume ratio of water vapor to the total volume in the gas is indicated.
Readjusting the flow rates of the first electronic flow controller 2 of the sampling measurement channel and the second electronic flow controller of the shunt channel so that the standard dry gas flow meets the detection index requirement;
s7: detecting gas;
the detector detects the sampling gas to obtain the gas concentration of the gas to be detected;
s8: the gas concentration value of the dry gas in the standard state is folded;
the detected gas concentration is the actual gas concentration, and the actual environment, i.e. temperature, air pressure, humidity and other parameters of each sampling point are different, so that when the obtained actual measured gas concentration values are equal, the actual folded standard dry gas concentration may not be equal due to different environment parameters. In order to uniformly measure whether the measurement result, namely, the gas concentration accords with the emission requirement, the measurement result needs to be folded into the gas concentration value of the dry gas in the standard state, and the calculation formula is as follows:
wherein: c (C) n Is the dry gas concentration in mg/m under standard condition 3 The method comprises the steps of carrying out a first treatment on the surface of the C is the measured gas concentration, mg/m 3 ；
S9: and (5) ending the sampling measurement.
The above description is only of the preferred embodiments of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements, etc. within the principle of the idea of the invention should be included in the scope of protection of the invention.
Claims (5)
1. A multichannel gas sampling measurement method with flow control is characterized in that: the sampling measurement system used by the method comprises a man-machine interaction touch screen (11), a sampling pump (9), a controller (10), a multi-path sampling measurement unit, a gas distribution unit and a multi-pipeline gas row (8); each path of sampling and measuring unit comprises a sampling head (13), a filter (1), a first electronic flow controller (2), a detector (3), a temperature sensor (4), a pressure sensor (5) and a humidity sensor (6); the gas diversion unit comprises a second electronic flow controller (12) and a diversion gas pipeline; the sampling head (13), the filter (1), the first electronic flow controller (2) and the detector (3) are sequentially connected by using a gas pipe; the multi-pipeline gas row (8) is a cuboid box body, the top of the multi-pipeline gas row is provided with a plurality of gas-like openings, two side faces in the length direction are symmetrically provided with an opening respectively, one side of the multi-pipeline gas row is a gas outlet, the other side of the multi-pipeline gas row is a split-flow opening, a gas channel is formed in the multi-pipeline gas row, and all the gas openings are connected into the gas channel; the gas sampling port of the multi-pipeline gas row (8) is connected with the detector (3) through a gas pipe, and the temperature sensor (4), the pressure sensor (5) and the humidity sensor (6) are arranged in the gas pipe; the air outlet of the multi-pipeline air exhaust (8) is connected with a sampling pump (9), and the shunt port is connected with the second electronic flow controller (12) of the air shunt unit through an air pipe; the air inlet of the second electronic flow controller is connected to the split flow inlet through the split flow air pipeline; the human-computer interaction touch screen (11), the first electronic flow controller (2), the detector (3) and the second electronic flow controller (12) are respectively connected with the controller (10);
the sampling measurement specifically comprises the following steps:
s1: selecting a measurement point location;
s2: selecting a filter cartridge;
s3: starting the electronic equipment;
s4: adjusting the flow to zero;
setting the flow of the first electronic flow controller (2) and the second electronic flow controller (12) to be zero through a human-computer interaction touch screen (11);
s5: starting a sampling pump (9) and setting a flow initial value;
setting the initial flow value of a first electronic flow controller (2) of each sampling measurement unit to be an expected value; setting the flow value of the second electronic flow controller (12) such that each flow satisfies the relationship:
wherein: f (F) D The unit is L/min which is the flow of the diversion channel; f (F) p The unit is L/min for the rated flow of the sampling pump; f (F) di Measuring the channel flow for each sample in L/min;
s6: regulating the flow;
the controller (10) calculates the standard dry gas flow of each sampling measurement channel according to the temperature, humidity and air pressure values acquired by each sampling measurement channel, transmits the calculation result to the man-machine interaction touch screen (11) for display,
the standard dry gas flow is calculated as follows:
wherein: q (Q) n The dry gas flow rate is the unit L/min under the standard state; q is the measured gas flow of the first electronic flow controller (2), and the unit is L/min; t is the measured gas temperature in DEG C; b (B) a Is the local atmospheric pressure value, unit kPa; p is the measured gas pressure, unit kPa; x is X sw Is the measured gas moisture content;
readjusting the flow rates of the first electronic flow controller (2) of the sampling measurement channel and the second electronic flow controller (12) of the shunt channel so that the standard dry gas flow meets the detection index requirement;
s7: detecting gas;
the detector detects the sampling gas to obtain a gas concentration value of the gas to be detected;
s8: the gas concentration value of the dry gas in the standard state is folded;
the formula of the folding calculation is as follows:
wherein: c (C) n Is the dry gas concentration in mg/m under standard condition 3 The method comprises the steps of carrying out a first treatment on the surface of the C is the measured gas concentration, mg/m 3 ；
S9: and (5) ending the sampling measurement.
2. The multi-channel gas sampling measurement method with flow control according to claim 1, wherein the step S2 of selecting a filter cartridge refers to selecting a filter cartridge type according to the gas to be detected and selecting the pore diameter of the filter cartridge according to the measurement requirement.
3. The multi-channel gas sampling measurement method with flow control according to claim 1, wherein a gas pipe joint is installed on the gas port of the connecting gas pipe of the multi-channel gas exhaust (8).
4. The multi-channel gas sampling measurement method with flow control according to claim 1, characterized in that the idle sample gas port of the multi-channel gas line (8) is sealed with a plug (7).
5. The multi-channel gas sampling measurement method with flow control according to claim 1, characterized in that the control switch of the sampling pump (9) is connected to a controller (10).
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