CN112485071A - VOCs volatile organic compounds on-line monitoring system - Google Patents
VOCs volatile organic compounds on-line monitoring system Download PDFInfo
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- CN112485071A CN112485071A CN202011294403.3A CN202011294403A CN112485071A CN 112485071 A CN112485071 A CN 112485071A CN 202011294403 A CN202011294403 A CN 202011294403A CN 112485071 A CN112485071 A CN 112485071A
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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
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
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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
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
- G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
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Abstract
The invention discloses an online Volatile Organic Compounds (VOCs) monitoring system, which comprises a sampling system, a pretreatment system, a VOC analyzer, an air source, an auxiliary monitoring system, a data acquisition system, a calibration system and an electric control system, wherein the pretreatment system is connected with the VOC analyzer; the sampling system comprises a sampling probe extending into the flue gas channel, the output end of the sampling system is connected with the input end of the pretreatment system through a heat tracing pipeline, the pretreatment system comprises a fine filter and a sampling pump, the sampling pump is used for controlling the sampling system to collect sample gas from the flue gas channel, and the output end of the pretreatment system sends the fine filtered sample gas into the VOC analyzer through the heat tracing pipeline for component analysis; the electric control system respectively supplies power to each device and controls the work of the devices. The invention has high temperature in the whole process from sampling to detection and analysis, does not need to remove water, and can ensure the safety of the system, effectively avoid sample gas loss and ensure the accuracy and reliability of monitoring data by the transmission of the heat tracing pipeline.
Description
Technical Field
The invention belongs to a volatile organic compound detection technology, and particularly relates to an online Volatile Organic Compound (VOCs) monitoring system.
Background
VOCs refer to organic compounds with saturated vapor pressure of more than 133.32Pa at normal temperature and boiling point of 50-260 ℃ below under normal pressure, or any organic solid or liquid capable of volatilizing at normal temperature and normal pressure.
VOCs can be divided into eight groups in terms of chemical structure: alkanes, aromatic hydrocarbons, alkenes, halocarbons, esters, aldehydes, ketones, and others. Its main components include hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbon and nitrogen hydrocarbon, including benzene series, organic chloride, freon series, organic ketone, amine, alcohol, ether, ester, acid and petroleum hydrocarbon compound, etc.
Most VOCs have pungent odor or stink, which can cause unpleasant sensation and seriously reduce the life quality of people. Benzene, toluene, xylene, formaldehyde and the like have the greatest harm to human health, and people can suffer from anemia and leukemia after long-term contact. Benzene, toluene, acetone, dimethylamine, and thiohydrocarbons are flammable, and if electrostatic sparks or other fire sources are encountered at high emission concentrations, fires are easily caused. Some VOCs such as chlorofluorocarbon can destroy the ozone layer, and the destruction of the ozone layer increases the amount of ultraviolet radiation reaching the ground, and has great harm to human skin, eyes and immune system.
Visible VOCs are mostly non-environment-friendly gases, and can generate certain pollution to air, so that volatile organic compounds on site need to be monitored. The existing detection means has low automation degree, the general sampling method seriously influences the detection effect, and the collected sample gas is not correspondingly processed.
Disclosure of Invention
Aiming at the problems of low automation and large detection result error of a VOCs (volatile organic compounds) monitoring system in the prior art, the invention provides an online Volatile Organic Compounds (VOCs) monitoring system
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
an online volatile organic compound monitoring system comprises a sampling system, a pretreatment system, a VOC analyzer, an air source, an auxiliary monitoring system, a data acquisition system, a calibration system and an electric control system;
the sampling system comprises a sampling probe extending into the flue gas channel, wherein a coarse filter is arranged at the rear end of the sampling probe, the output end of the sampling system is connected with the input end of the pretreatment system through a heat tracing pipeline, the pretreatment system comprises a fine filter and a sampling pump, the sampling pump is used for controlling the sampling system to collect sample gas from the flue gas channel, and the output end of the pretreatment system sends the fine filtered sample gas into the VOC analyzer through the heat tracing pipeline for component analysis;
the gas source comprises a carrier gas generator, a hydrogen generator, a zero gas generator and an air compressor, wherein the output end of the carrier gas generator is positioned between a sampling system and a pretreatment system, a first battery valve is arranged on a pipeline of the sampling system positioned in front of the carrier gas generator, a pneumatic valve is arranged at the output port of the carrier gas generator, the output end of the hydrogen generator is connected with the gas inlet of a VOC analyzer, a stop valve is arranged between the hydrogen generator and the VOC analyzer, and the zero gas generator mixes zero gas with the gas outlet of the VOC analyzer through the air compressor and inputs the mixture into a purification device for treatment;
the auxiliary monitoring system comprises a temperature sensor, a pressure sensor and a flow sensor which are all arranged on a pipeline between the purifying equipment and the flue gas channel and close to the flue gas channel;
the data acquisition system collects detection data uploaded by the auxiliary monitoring system and the VOC analyzer for analysis and processing, and then sends the detection data to the industrial personal computer;
the calibration system comprises a standard gas storage tank connected with a standard gas inlet of the VOC analyzer, and a pressure reducing valve is arranged between the standard gas storage tank and the VOC analyzer;
and the electric control system respectively supplies power to the sampling system, the pretreatment system, the VOC analyzer, the air source, the auxiliary monitoring system, the data acquisition system and the calibration system and controls the work of the data acquisition system and the calibration system.
Further limiting, a back flushing pipeline connected with the carrier gas generator is arranged on a sampling system pipeline positioned in front of the first electromagnetic valve, and a second electromagnetic valve is arranged on the back flushing pipeline.
Further, the back flushing pipeline comprises an outer back flushing pipeline and an inner back flushing pipeline.
Further limited, the pretreatment system is also provided with a positive pressure explosion-proof controller.
Further defined, the purification apparatus is provided with a dehydration membrane and a particulate filtration device.
Further define, the VOC analysis appearance is gas chromatograph, just gas chromatograph is equipped with log record module and alarm module.
Further inject, still be equipped with the dynamic dilution appearance between mark gas storage jar and the VOC analysis appearance.
Further defined, the auxiliary monitoring system further comprises a humidity sensor and an oxygen content sensor.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has high temperature in the whole process from sampling to detection and analysis, does not need to remove water, can ensure the safety of the system and effectively avoid sample gas loss through the transmission of the heat tracing pipeline, ensures the accuracy and reliability of monitoring data, and can meet the standards of the United states and European Union.
2. The invention extracts the sample gas irregularly, ensures that the sample gas is in a real-time updating state, effectively improves the response time of the system, and can effectively purify and discharge the analyzed sample gas, thereby avoiding air pollution.
3. The data acquisition system meets the requirements of HJ75 and HJ76, can be used for compiling a CEMS daily report, a monthly report and an annual report in a compliance mode, displaying and recording monitoring data of system monitoring pollutants, alarming information such as standard exceeding and the like, generating and storing an operation record report and a power failure record report, and recording logs of system operation and operation states.
Drawings
Fig. 1 is a schematic structural diagram of an online monitoring system for Volatile Organic Compounds (VOCs), in which a thick line is a gas flow pipeline and a thin line is a circuit or a data transmission line.
The notation in the figure is: the method comprises the following steps of 1-a flue gas channel, 2-a sampling system, 21-a sampling probe, 22-a first electromagnetic valve, 3-a pretreatment system, 4-a gas chromatograph, 5-a carrier gas generator, 51-a back flushing pipeline, 52-a second electromagnetic valve, 53-a pneumatic valve, 61-a hydrogen generator, 62-a zero gas generator, 63-an air compressor, 64-a standard gas storage tank, 7-an industrial personal computer, 8-an auxiliary monitoring system and 9-an electric control system.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Referring to fig. 1, an online monitoring system for volatile organic compounds includes a sampling system 2, a pretreatment system 3, a VOC analyzer, a gas source, an auxiliary monitoring system 8, a data acquisition system, and a calibration system.
The sampling system 2 adopts the mode of extracting full high temperature completely to gather the sample gas, and sampling probe 21 stretches into the appropriate position of flue gas passageway 1 or chimney, and wherein the sampling probe 21 rear end is equipped with the coarse filter for carry out the prefilter to the sample gas of gathering, and the filter fineness is 2 microns, and the input of sampling system 2 output through heat tracing pipeline connection pretreatment system 3. As the temperature of the collected sample gas is higher, the heat tracing pipeline can adopt an SL-100 heat tracing pipe which is made of polytetrafluoroethylene and is externally wrapped with a nickel-plated copper wire shielding armor sheath.
The pretreatment system 3 comprises a fine filter and a sampling pump, the sampling pump regularly controls the sampling system 2 to collect sample gas from the flue gas channel 1, and the pretreatment system 3 sends the fine filtered sample gas into the VOC analyzer through a heat tracing pipeline. Wherein the fine filter filtration precision is 0.5 micron for filter the tiny particle in the high temperature sample gas, prevent that the tiny particle from getting into VOC analysis appearance and other pipelines and taking place the jam. The sampling pump ensures that the sample gas is in a real-time updating state through uninterrupted sampling.
The main flow devices of the sampling system 2 and the preprocessing system 3 are made of corrosion-resistant and inerting materials, so that sample gas adsorption is reduced, and data reliability is improved. The pretreatment system 3 is preferably provided with a positive pressure explosion-proof device to improve safety.
The VOC analyzer adopts a GC-3100-01 online gas chromatograph 4 produced by Honeyville, the gas chromatograph 4 adopts a solution scheme of double valves, double columns, single FID and whole-process high-temperature heat tracing, a sample is subjected to double-valve sample introduction system, double-color spectral column separation and hydrogen flame ionization detector detection to respectively determine the total hydrocarbon and methane content in the sample, and the Total Hydrocarbon (THC) subtracts methane (CH4) and oxygen in air to calculate the content of non-methane total hydrocarbon (NMHC). The instrument allows the meter to accurately measure the non-methane total hydrocarbons that the high boiling point material is performing, even in the presence of high concentrations of non-methane total hydrocarbons.
The gas chromatograph 4 is provided with an RS232 output for uploading the analysis data to the industrial personal computer 7, and is also provided with a USB data interface and a VGA interface.
Meanwhile, the gas chromatograph 4 is provided with a log recording module, an automatic alarm module, an abnormity reminding module and the like, and supports short message alarm.
The air supply of this system includes carrier gas generator 5, hydrogen generator 61, zero gas generator 62 and air compressor machine 63, wherein carrier gas generator 5 output is located between sampling system 2 and the preprocessing system 3, is connected to the output pipeline in sampling system 2 in fact, and is located and is equipped with first battery valve on the sampling system 2 pipeline before the carrier gas generator 5 hookup location for prevent that the carrier gas from outwards blowing, the carrier gas delivery outlet of carrier gas generator 5 is equipped with pneumatic valve 53, when the sample gas collection comes in, can carry the sample gas through opening pneumatic valve 53 control carrier gas and carry the analysis.
A back-blowing pipeline 51 connected with the carrier gas generator 5 is further arranged on the output pipeline of the sampling system 2 in front of the first electromagnetic valve 22, the back-blowing pipeline 51 comprises an outer back-blowing pipeline and an inner back-blowing pipeline, and second electromagnetic valves 52 are arranged on the outer back-blowing pipeline and the inner back-blowing pipeline of the carrier gas generator 5.
The hydrogen generator 61 is of a rack type, the output end of the hydrogen generator is connected with the air inlet of the VOC analyzer, a stop valve is arranged between the hydrogen generator 61 and the VOC analyzer, and the stop valve can be closed after the VOC analyzer analyzes the components of the sample gas, so that the hydrogen is prevented from leaking.
The hydrogen generator 61 is totally enclosed, and compared with the traditional alkali liquor type hydrogen generator 61, the damage of alkali liquor is avoided to the maximum extent. Meanwhile, a pressure flow sensor is arranged for monitoring and protecting, and an RS232 interface is arranged for communication. The hydrogen flow rate generated by the hydrogen generator 61 is less than 500ml/min, the pressure is less than 0.3Mpa, and the purity is 99.999 percent, which is not enough for explosion.
The zero gas generator 62 mixes the zero gas with a sample gas outlet of the gas chromatograph 4 through an air compressor 63, inputs the mixture into a purifying device for processing, and then discharges the mixture. The zero gas is used as a combustion-supporting gas, does not contain a component to be measured or an interfering substance, but may contain a component irrelevant to measurement, and generally, high-purity nitrogen or clean air containing no component to be measured is used as the zero gas.
The air compressor 63 is subjected to vibration reduction treatment, so that quick pressurization is facilitated, clean drying is performed, and moisture in the gas is reduced.
The purification equipment adopts a high-temperature catalytic oxidation technology, takes various noble metal materials as catalysts, and completely oxidizes hydrocarbon substances in the sample gas to generate carbon dioxide and water, thereby achieving the purpose of purification.
The purification equipment is provided with a dehydration membrane and a particle filtering device, so that the dew point of the product gas is reduced to below 20 ℃ below zero, and the particle diameter is less than 0.01 micron.
The purifying equipment can also be additionally provided with a carbon dioxide, nitrogen oxide and inorganic sulfur removing device, and can also be additionally provided with a buffer tank for pushing a valve.
The auxiliary monitoring system 8 comprises a temperature sensor, a pressure sensor and a flow sensor which are all fixedly installed on the flue gas channel 1, and the probe extends into the flue gas channel 1.
The temperature sensor adopts a 316L stainless steel probe, measures temperature by a platinum resistance method, coats a polytetrafluoroethylene anticorrosive material on the surface, and can ensure the measurement precision of the temperature through temperature compensation. The pressure sensor adopts a high-precision isolating membrane pressure sensor for measurement. The flow sensor adopts a differential pressure measurement method to measure, the flow velocity of the flue gas is obtained by measuring the total pressure and the static pressure in the flow of the flue gas, and the surface of the flow sensor is coated with the polytetrafluoroethylene anticorrosive material.
The temperature sensor, the pressure sensor and the flow sensor can be integrated in a temperature-pressure-flow all-in-one machine, 4-20 mA signals are output, and the measuring range can be defined according to working condition requirements.
The auxiliary monitoring system 8 can be additionally provided with a humidity sensor and an oxygen content sensor, so that the humidity and the dry oxygen concentration are output, and a user can finish automatic calibration of the external humidity or the dry oxygen concentration through an input port of the display panel.
The data acquisition system is used for collecting detection data uploaded by the auxiliary monitoring system 8 and the gas chromatograph 4 for analysis and processing, and then sending the detection data to the industrial personal computer 7.
The data acquisition system can display the real-time concentration of methane, total hydrocarbon and non-methane total hydrocarbon through a screen, and mark the state of data, and the real-time data of each parameter of the equipment and the running state of the equipment, such as flue gas temperature, pressure, flow velocity or flow, flue gas humidity and the like.
The data acquisition system has a data conversion function, displays effective hour average values, effective day average values and effective month average values of the concentrations of methane, total hydrocarbons and non-methane total hydrocarbons, and supports printing and uploading.
Meanwhile, time period retrieval is supported, and concentration trend spectrograms of methane, total hydrocarbons and non-methane total hydrocarbons are drawn.
The single data storage is not less than 12 months, and the 1-hour data storage is not less than 5 years. The original data of the gas chromatograph 4 is stored for not less than 2 weeks and can be set as required.
Monitoring parameters such as upper and lower limits of data alarm measurement, alarm meaning represented by analog input quantity related parameters and data input switching values, pipeline cross section area, management authority and login password can be set.
The analysis result of the data acquisition system can be remotely uploaded to a remote server according to set time, and can also be communicated with an environmental protection information platform of a local network environmental protection bureau to report monitoring data.
The calibration system is a standard gas storage tank 64 connected with a standard gas inlet of the VOC analyzer, and a pressure reducing valve is arranged between the standard gas storage tank 64 and the VOC analyzer.
The standard gas storage tank 64 can select standard gases with different parameters according to working conditions, and can also adopt a dynamic dilution instrument to dilute the standard gas with the same concentration.
The electric control system 9 is the core of the system, and mainly controls the sampling system 2, the pretreatment system 3, the VOC analyzer, the air source, the auxiliary monitoring system 8, the data acquisition system, the calibration system and other equipment to work, and the specific control process is as follows:
the method comprises the steps of firstly opening a second electromagnetic valve 52 in a back flushing pipeline 51 to clean redundant gas in the pipeline and avoid influencing a monitoring result, then closing the back flushing pipeline 51, opening a sampling pump, a pneumatic valve 53 of a carrier gas generator 5 and an electromagnetic valve, collecting sample gas through a sampling system 2, enabling the sample gas to enter a pretreatment system 3 together with carrier gas for fine filtration after being filtered by a coarse filter, opening a stop valve after a hydrogen gas generator is started to enable hydrogen gas and the sample gas after fine filtration to enter a VOC analyzer to analyze components of the sample gas, sending an analyzed result to an industrial personal computer 7, and opening a zero gas generator 62 and the sample gas after the VOC analyzer to perform catalytic purification treatment.
The auxiliary monitoring system 8 monitors the temperature, pressure and flow parameters of the flue gas channel 1 in real time, can also monitor the humidity and the dry oxygen concentration according to the needs, and uploads the temperature, the pressure and the flow parameters to the industrial personal computer 7 after being processed by the data acquisition system.
The standard gas system selects the standard gas storage tanks 64 with different parameters according to the requirements of the electric control system 9, and can also adopt a dynamic dilution instrument to dilute the standard gas with the same concentration.
The online monitoring system for VOCs volatile organic compounds provided by the application is introduced in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the methods of the present application and their core concepts. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (8)
1. An online volatile organic compound monitoring system is characterized by comprising a sampling system, a pretreatment system, a VOC analyzer, an air source, an auxiliary monitoring system, a data acquisition system, a calibration system and an electric control system;
the sampling system comprises a sampling probe extending into the flue gas channel, wherein a coarse filter is arranged at the rear end of the sampling probe, the output end of the sampling system is connected with the input end of the pretreatment system through a heat tracing pipeline, the pretreatment system comprises a fine filter and a sampling pump, the sampling pump is used for controlling the sampling system to collect sample gas from the flue gas channel, and the output end of the pretreatment system sends the fine filtered sample gas into the VOC analyzer through the heat tracing pipeline for component analysis;
the gas source comprises a carrier gas generator, a hydrogen generator, a zero gas generator and an air compressor, wherein the output end of the carrier gas generator is positioned between a sampling system and a pretreatment system, a first battery valve is arranged on a pipeline of the sampling system positioned in front of the carrier gas generator, a pneumatic valve is arranged at the output port of the carrier gas generator, the output end of the hydrogen generator is connected with the gas inlet of a VOC analyzer, a stop valve is arranged between the hydrogen generator and the VOC analyzer, and the zero gas generator mixes zero gas with the gas outlet of the VOC analyzer through the air compressor and inputs the mixture into a purification device for treatment;
the auxiliary monitoring system comprises a temperature sensor, a pressure sensor and a flow sensor which are all arranged on a pipeline between the purifying equipment and the flue gas channel and close to the flue gas channel;
the data acquisition system collects detection data uploaded by the auxiliary monitoring system and the VOC analyzer for analysis and processing, and then sends the detection data to the industrial personal computer;
the calibration system comprises a standard gas storage tank connected with a standard gas inlet of the VOC analyzer, and a pressure reducing valve is arranged between the standard gas storage tank and the VOC analyzer;
and the electric control system respectively supplies power to the sampling system, the pretreatment system, the VOC analyzer, the air source, the auxiliary monitoring system, the data acquisition system and the calibration system and controls the work of the data acquisition system and the calibration system.
2. The online volatile organic compound monitoring system according to claim 1, wherein a back-flushing pipeline connected to the carrier gas generator is further provided on the sampling system pipeline before the first solenoid valve, and a second solenoid valve is provided on the back-flushing pipeline.
3. The online volatile organic compound monitoring system of claim 2, wherein the blowback pipeline comprises an external blowback pipeline and an internal blowback pipeline.
4. The online volatile organic compound monitoring system according to claim 1, wherein the pretreatment system is further provided with a positive pressure explosion-proof controller.
5. The online volatile organic compound monitoring system according to claim 1, wherein the purification device is provided with a dehydration membrane and a particle filtration device.
6. The online monitoring system for volatile organic compounds according to claim 1, wherein the VOC analyzer is a gas chromatograph, and the gas chromatograph is provided with a log module and an alarm module.
7. The online volatile organic compound monitoring system according to claim 6, wherein a dynamic dilution instrument is further disposed between the standard gas storage tank and the VOC analyzer.
8. The online volatile organic compound monitoring system according to claim 1, wherein the auxiliary monitoring system further comprises a humidity sensor and an oxygen content sensor.
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Application publication date: 20210312 |