CN114414717A - Continuous monitoring system for volatile organic compounds of fixed pollution source - Google Patents
Continuous monitoring system for volatile organic compounds of fixed pollution source Download PDFInfo
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- CN114414717A CN114414717A CN202210097548.7A CN202210097548A CN114414717A CN 114414717 A CN114414717 A CN 114414717A CN 202210097548 A CN202210097548 A CN 202210097548A CN 114414717 A CN114414717 A CN 114414717A
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- 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
- 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
- G01N30/24—Automatic injection systems
Abstract
The invention relates to a continuous monitoring system for volatile organic compounds of a fixed pollution source. The system comprises: the device comprises a sampling probe, a sampling pipe, a PLC (programmable logic controller), and a smoke parameter acquisition device, a pretreatment device, a gas chromatograph, a gas circuit device, a sampling pump and a back flushing device which are respectively connected with the PLC; the sampling probe and the smoke parameter acquisition device are both arranged at a fixed pollution source end; one end of the sampling pipe is connected with the sampling probe, and the other end of the sampling pipe is connected with one end of the pretreatment device; the other end of the pretreatment device is connected with a gas chromatograph; the gas chromatograph is respectively connected with the gas path device and the sampling pump; the back-blowing device is respectively connected with the smoke parameter acquisition device, the sampling probe, the pretreatment device and the gas chromatograph. The continuous monitoring system for the fixed pollution source volatile organic compounds can be used for continuously and accurately monitoring the concentration and various parameters of the fixed pollution source volatile organic compounds in real time, and can ensure the accuracy and the authenticity of data.
Description
Technical Field
The invention relates to the technical field of pollution source detection, in particular to a continuous monitoring system for volatile organic compounds of a fixed pollution source.
Background
Volatile Organic Compounds (VOCs) are a generic term for Organic Compounds that can participate in atmospheric photochemical reactions. VOCs being atmospheric airThe most important class of pollutants in pollution, many of whose components are toxic, corrosive and carcinogenic, can trigger ozone (O)3) Pollution, fine particulate matter (PM2.5) pollution and odor pollution seriously affect the air quality and the living health of residents, and become the air pollutants which are mainly controlled in China in recent years.
At present, the online monitoring of fixed pollution source VOCs is still in the stage of just starting, and in the developing VOCs monitoring work, the adopted method is more diversified, the monitoring data is relatively scattered, and the target compounds are inconsistent. The VOCs monitoring technology disclosed previously is mainly an off-line laboratory monitoring technology, and is difficult to effectively and comprehensively reflect the pollution characteristics and conditions of VOCs in a monitoring area in real time. Therefore, the online volatile organic compound monitoring system specially for the fixed pollution sources of the industrial enterprises is provided to continuously and accurately monitor the concentration and various parameters of the waste gas discharged by the fixed pollution sources in real time, and the technical problem to be solved in the field is urgently needed.
Disclosure of Invention
The invention aims to provide a continuous monitoring system for volatile organic compounds of a fixed pollution source, which is used for continuously and accurately monitoring the concentration and various parameters of the volatile organic compounds of the fixed pollution source in real time.
In order to achieve the purpose, the invention provides the following scheme:
a continuous monitoring system for volatile organic compounds of a stationary pollution source, comprising: the device comprises a sampling probe, a sampling pipe, a PLC (programmable logic controller), and a smoke parameter acquisition device, a pretreatment device, a gas chromatograph, a gas circuit device, a sampling pump and a back flushing device which are respectively connected with the PLC;
the sampling probe and the smoke parameter acquisition device are both arranged at a fixed pollution source end; one end of the sampling pipe is connected with the sampling probe, and the other end of the sampling pipe is connected with one end of the pretreatment device; the other end of the pretreatment device is connected with the gas chromatograph; the gas chromatograph is respectively connected with the gas path device and the sampling pump; the back flushing device is respectively connected with the smoke parameter acquisition device, the sampling probe, the pretreatment device and the gas chromatograph.
Optionally, the flue gas parameter acquisition device comprises a temperature and pressure flow integrated monitor and a humidity sensor.
Optionally, the pretreatment device comprises a temperature control device, and a heating filter tube and a Nafion gas drying tube bundle which are connected in sequence; the heating filter pipe comprises a polytetrafluoroethylene pipe, a heating pipe sleeve coated on the outer surface of the polytetrafluoroethylene pipe, a heat preservation pipe sleeve coated on the outer surface of the heating pipe sleeve, and a filter layer arranged at the air inlet end of the polytetrafluoroethylene pipe; the gas inlet end of the polytetrafluoroethylene tube is connected with the gas outlet end of the sampling tube, and the gas outlet end of the polytetrafluoroethylene tube is connected with the gas inlet end of the Nafion gas drying tube bundle; a heating coil is arranged in the heating pipe sleeve; the temperature control device is respectively connected with the heating coil and the PLC.
Optionally, the filter layer comprises a filter plate and filter cotton which are sequentially arranged at the air inlet end of the polytetrafluoroethylene tube; the filter plate is provided with a plurality of filter holes.
Optionally, the Nafion gas drying tube bundle comprises a plurality of Nafion tubes and heat-insulating layers arranged at the gas inlet end and the gas outlet end of the Nafion tubes; the air inlet end of the Nafion pipe is connected with the air outlet end of the heating filter pipe; the gas outlet end of the Nafion pipe is connected with the gas chromatograph; a back-blowing air inlet and a back-blowing air outlet are respectively arranged on two sides of the Nafion gas drying tube bundle; and the back blowing air inlet is connected with the back blowing device.
Optionally, the gas path device comprises a zero gas generator, a hydrogen gas generator and a nitrogen gas source.
Optionally, the blowback device comprises an air compressor and a mass flow meter; the air compressor is respectively connected with the smoke parameter acquisition device, the sampling probe, the pretreatment device and the gas chromatograph through an air blowing pipeline; the mass flow meter is arranged on the air blowing pipeline.
Optionally, the system further comprises: a mobile terminal and a PC; the mobile terminal and the PC are respectively connected with the PLC; and the mobile terminal and the PC are connected with a remote client or an environment-friendly platform in a wireless transmission mode.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a continuous monitoring system for volatile organic compounds of a fixed pollution source, which comprises: the device comprises a sampling probe, a sampling pipe, a PLC (programmable logic controller), and a smoke parameter acquisition device, a pretreatment device, a gas chromatograph, a gas circuit device, a sampling pump and a back flushing device which are respectively connected with the PLC; the sampling probe and the smoke parameter acquisition device are both arranged at a fixed pollution source end; one end of the sampling pipe is connected with the sampling probe, and the other end of the sampling pipe is connected with one end of the pretreatment device; the other end of the pretreatment device is connected with the gas chromatograph; the gas chromatograph is respectively connected with the gas path device and the sampling pump; the back flushing device is respectively connected with the smoke parameter acquisition device, the sampling probe, the pretreatment device and the gas chromatograph. The continuous monitoring system for the fixed pollution source volatile organic compounds can be used for continuously and accurately monitoring the concentration and various parameters of the fixed pollution source volatile organic compounds in real time, and can ensure the accuracy and the authenticity of data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic overall structure diagram of a fixed pollution source volatile organic compound continuous monitoring system provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a continuous monitoring system for volatile organic compounds of a fixed pollution source, which is used for continuously and accurately monitoring the concentration and various parameters of the volatile organic compounds of the fixed pollution source in real time.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic overall structure diagram of a fixed pollution source volatile organic compound continuous monitoring system provided in an embodiment of the present invention. Referring to fig. 1, the system for continuously monitoring volatile organic compounds of a fixed pollution source comprises: the device comprises a sampling probe 1, a sampling pipe 2, a PLC 3, and a flue gas parameter acquisition device 4, a pretreatment device 5, a gas chromatograph 6, a gas circuit device 7, a sampling pump 8 and a back flushing device (not shown) which are respectively connected with the PLC 3.
The sampling probe 1 and the smoke parameter acquisition device 4 are both arranged at a fixed pollution source end; one end of the sampling pipe 2 is connected with the sampling probe 1, and the other end of the sampling pipe 2 is connected with one end of the pretreatment device 5. The other end of the pretreatment device 5 is connected with the gas chromatograph 6.
In practical applications, the stationary pollution source is usually a stationary pollution source exhaust emission pipeline of an industrial enterprise. The sampling probe 1 is used for collecting pollution source sample gas and conveying the gas to a gas pretreatment device 5 through a sampling pipe 2. The gas pretreatment device 5 is used for pretreatment such as filtration, heating and drying of the sampled gas. After the sampling gas is pretreated by the gas pretreatment device 5, the pretreated gas is conveyed into the gas chromatograph 6 for VOC analysis and detection.
The gas chromatograph 6 is respectively connected with the gas path device 7 and the sampling pump 8.
The gas analysis device adopted by the invention is an online gas chromatograph 6, the gas inlet of the online gas chromatograph 6 is communicated with the gas outlet of the pretreatment device, and the gas outlet of the online gas chromatograph 6 is communicated with a sampling pump 8 through a flow controller. The method has the characteristics of high efficiency, high selectivity, high sensitivity, high analysis speed, small sample dosage and suitability for qualitative and quantitative analysis of isomer and multi-component mixtures by utilizing online gas chromatography detection, and not only can directly monitor the components and concentration of VOC, but also can detect the TVOC concentration.
The sampling pump 8 is arranged on a downstream pipeline of the gas chromatograph 6 and adopts a negative pressure sampling mode. The sampling pump 8 adopts a normal temperature pump, is not directly contacted with waste gas, avoids component adsorption, and reduces the failure rate and the operation cost.
The back flushing device is respectively connected with the smoke parameter acquisition device 4, the sampling probe 1, the pretreatment device 5 and the gas chromatograph 6. The communication between the back flushing device and each component can be realized by an auxiliary pipeline and an N-way valve.
Specifically, the flue gas parameter acquisition device 4 comprises a temperature and pressure flow integrated monitor and a humidity sensor. Temperature-pressure flow integration monitor and humidity transducer all set up at fixed pollution source end, temperature-pressure flow integration monitor links to each other with discharge line for carry out temperature, pressure, velocity of flow and detect, humidity transducer is used for carrying out the detection of sampling gas humidity.
The PLC 3 is connected with the flue gas parameter acquisition device 4 and the gas chromatograph 6 and is used for acquiring temperature, pressure and flow, humidity and concentration signals and generating reports of various data according to the acquired data for on-site viewing.
Specifically, the pretreatment device comprises a temperature control device, and a heating filter tube and a Nafion gas drying tube bundle which are sequentially connected. The heating filter pipe is used for heating and filtering the wet flue gas of the fixed pollution source. The Nafion gas drying tube bundle is used for filtering wet flue gas of a fixed pollution source to obtain dry and dust-free flue gas.
The heating and filtering pipe comprises a polytetrafluoroethylene pipe, a heating pipe sleeve coated on the outer surface of the polytetrafluoroethylene pipe, a heat preservation pipe sleeve coated on the outer surface of the heating pipe sleeve, and a filtering layer arranged at the air inlet end of the polytetrafluoroethylene pipe. And the gas inlet end of the polytetrafluoroethylene tube is connected with the gas outlet end of the sampling tube 2, and the gas outlet end of the polytetrafluoroethylene tube is connected with the gas inlet end of the Nafion gas drying tube bundle. And a heating coil is arranged in the heating pipe sleeve. The temperature control device is arranged on the outer wall of the heating filter tube and is respectively connected with the heating coil and the PLC. The heating filter tube is used for heating the collected sample gas to 130-160 ℃.
Control start heating coil through PLC controller and temperature control device, heat the intraductal VOC flue gas of polytetrafluoroethylene, avoid this heating filter tube external temperature low and cause the liquefaction of VOC flue gas and adsorb at heating filter tube inner wall to cause the influence to gas chromatograph's testing result's accuracy. The heat preservation pipe sleeve plays a role in heat preservation of the heating sleeve, reduces heat loss of the heating sleeve and simultaneously enhances the heating effect of the heating sleeve.
The filter layer comprises a filter plate and filter cotton which are sequentially arranged at the air inlet end of the polytetrafluoroethylene tube. The filter plate is provided with a plurality of filter holes. The diameter of the filter hole is not more than 8 mm. The filter plate is arranged at the end of the polytetrafluoroethylene tube, so that impurities or dust in the VOC flue gas can be preliminarily filtered, and the detection precision of the gas chromatograph is improved. The back blowing device blows air regularly to the filter plate, and dust accumulated on the filter plate is removed, so that normal work of the whole heating filter pipe is guaranteed.
The filter cotton adopts clean glass cotton for filter the particulate matter in the flue gas, is favorable to impurity or the absorption of adsorbability material to be clear away in the flue gas, reinforcing filter effect.
The Nafion gas drying tube bundle comprises a plurality of Nafion tubes and heat-insulating layers arranged at the gas inlet ends and the gas outlet ends of the Nafion tubes. The heat insulating layer can be a ceramic fiber heat insulating layer. And the air inlet end of the Nafion pipe is connected with the air outlet end of the heating filter pipe. And the air outlet end of the Nafion pipe is connected with the gas chromatograph. And a back-blowing air inlet and a back-blowing air outlet are respectively arranged on two sides of the Nafion gas drying tube bundle. The blowback air inlet with blowback device is connected for dry gas is blown into to the intraductal blowing of nafion, forms vapor pressure gradient with the intraductal flue gas of nafion to carry out the drying to the intraductal flue gas of nafion, can effectively prevent sampling probe and drying tube jam.
The continuous monitoring system for the volatile organic compounds of the fixed pollution source adopts the modes of sampling by a sampling probe, heating and filtering by a heating filter tube and drying by a Nafion gas drying tube bundle, ensures that sample gas is collected from the fixed pollution source end until the sample gas enters a gas chromatograph 6 for detection and analysis, has no condensation point in the whole process and no loss of components, and thus ensures the accuracy and the authenticity of data.
The gas path device comprises a zero gas generator, a hydrogen generator and a nitrogen source. The zero gas generator, the hydrogen generator and the nitrogen gas source are respectively connected with the gas chromatograph 6 and used for providing the hydrogen gas source, the zero gas source and the nitrogen gas source for the gas chromatograph 6.
The back-blowing device comprises an air compressor and a mass flow meter for controlling the back-blowing air flow. The air compressor is connected with the smoke parameter acquisition device, the sampling probe, the pretreatment device and the gas chromatograph through air blowing pipelines respectively, is used for continuously providing dry and clean back blowing air for each component, and can also use an N-way valve to enable the back blowing air to enter the sampling pipe for back blowing when necessary. The mass flow meter is arranged on the air blowing pipeline.
When the continuous monitoring system for the volatile organic compounds of the fixed pollution source is used for continuous detection, the sampling pump 8 is started, the sampling flow is controlled through the mass flow meter, a certain amount of wet flue gas is filtered and heated by the pretreatment device, so that the temperature of the wet flue gas in the heating and filtering pipe is controlled to be 130-160 ℃, the wet flue gas enters a Nafion gas drying pipe bundle for dehumidification and drying, the dried flue gas enters a gas chromatograph for detection and analysis, relevant detection data such as concentration and components of the detection data are displayed by data display equipment, and the residual gas is discharged through the sampling pump 8.
In practical application, the sampling pump 8 adopts a normal temperature pump and adopts a negative pressure sampling mode, so that sample gas can be prevented from being adsorbed, the failure rate of components is reduced, and the operation cost of the system is reduced.
When the continuous monitoring system for the volatile organic compounds of the fixed pollution source performs back flushing, back flushing gas enters an air compressor, impurities such as water, oil and the like in the gas are removed through treatment, the flow of the back flushing gas is controlled through a flow controller, and dust accumulated in a smoke parameter acquisition device 4, a sampling probe 1, a sampling pipe 2, a pretreatment device 5 and a gas chromatograph 6 is subjected to back flushing through an air blowing pipeline. In practical application, the timing back flushing can be set by a program, the back flushing can also be manually carried out, and the back flushing and zero point comparison can also be carried out on the gas chromatograph 6.
In practical application, the system for continuously monitoring the volatile organic compounds of the fixed pollution source further comprises: a mobile terminal and a PC; the mobile terminal and the PC are respectively connected with the PLC 3; and the mobile terminal and the PC are connected with a remote client or an environment-friendly platform in a wireless transmission mode.
PLC controller 3 is used for monitoring and gathering all gas temperature, pressure, velocity of flow, humidity information and VOC gas concentration information to with above-mentioned information transmission to staff's mobile terminal or PC, and then generate report form, storage data and record historical data, be convenient for real-time supervision and look over. Furthermore, the mobile terminal and the PC can also realize data communication with a remote client or an environment-friendly platform to further process the acquired information.
The continuous monitoring system for the volatile organic compounds in the fixed pollution source can monitor the gas concentration, the gas temperature, the gas pressure, the gas flow rate and the gas humidity in the fixed pollution source in real time, pay attention to the gas operation condition in real time, avoid the pollution exceeding standard to cause the pollution to the air, and effectively avoid the occurrence of production accidents. The gas introduction end of the gas chromatograph is provided with the pretreatment device with the heating function, so that the VOC flue gas can be effectively prevented from being liquefied at a low temperature or adsorbed on the inner wall of the pretreatment device, the influence on the detection result of the gas chromatograph is avoided, and the detection accuracy of the VOC analysis is improved. Through set up the filter in the heating filter tube and cross the filter pulp, impurity in can the effective absorption VOC flue gas improves the filter effect. The continuous monitoring system for the volatile organic compounds of the fixed pollution source, provided by the invention, has excellent moisture resistance, stability, repeated reproducibility and continuous monitoring performance, and can ensure the accuracy of a monitoring result.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A continuous monitoring system for volatile organic compounds of a fixed pollution source is characterized by comprising: the device comprises a sampling probe, a sampling pipe, a PLC (programmable logic controller), and a smoke parameter acquisition device, a pretreatment device, a gas chromatograph, a gas circuit device, a sampling pump and a back flushing device which are respectively connected with the PLC;
the sampling probe and the smoke parameter acquisition device are both arranged at a fixed pollution source end; one end of the sampling pipe is connected with the sampling probe, and the other end of the sampling pipe is connected with one end of the pretreatment device; the other end of the pretreatment device is connected with the gas chromatograph; the gas chromatograph is respectively connected with the gas path device and the sampling pump; the back flushing device is respectively connected with the smoke parameter acquisition device, the sampling probe, the pretreatment device and the gas chromatograph.
2. The system for continuously monitoring volatile organic compounds of a stationary pollution source according to claim 1, wherein the flue gas parameter acquisition device comprises a temperature and pressure flow integrated monitor and a humidity sensor.
3. The system for continuously monitoring the volatile organic compounds of the fixed pollution source according to claim 1, wherein the pretreatment device comprises a temperature control device, a heating filter tube and a Nafion gas drying tube bundle which are sequentially connected; the heating filter pipe comprises a polytetrafluoroethylene pipe, a heating pipe sleeve coated on the outer surface of the polytetrafluoroethylene pipe, a heat preservation pipe sleeve coated on the outer surface of the heating pipe sleeve, and a filter layer arranged at the air inlet end of the polytetrafluoroethylene pipe; the gas inlet end of the polytetrafluoroethylene tube is connected with the gas outlet end of the sampling tube, and the gas outlet end of the polytetrafluoroethylene tube is connected with the gas inlet end of the Nafion gas drying tube bundle; a heating coil is arranged in the heating pipe sleeve; the temperature control device is respectively connected with the heating coil and the PLC.
4. The continuous monitoring system for volatile organic compounds of a fixed pollution source according to claim 3, wherein the filter layer comprises a filter plate and filter cotton which are sequentially arranged at the air inlet end of the polytetrafluoroethylene tube; the filter plate is provided with a plurality of filter holes.
5. The continuous monitoring system for volatile organic compounds of a fixed pollution source according to claim 3, wherein the Nafion gas drying tube bundle comprises a plurality of Nafion tubes and heat insulating layers arranged at the gas inlet end and the gas outlet end of the Nafion tubes; the air inlet end of the Nafion pipe is connected with the air outlet end of the heating filter pipe; the gas outlet end of the Nafion pipe is connected with the gas chromatograph; a back-blowing air inlet and a back-blowing air outlet are respectively arranged on two sides of the Nafion gas drying tube bundle; and the back blowing air inlet is connected with the back blowing device.
6. The system for continuously monitoring the volatile organic compounds of a stationary pollution source as claimed in claim 1, wherein the gas path device comprises a zero gas generator, a hydrogen gas generator and a nitrogen gas source.
7. The continuous monitoring system for volatile organic compounds of a stationary pollution source according to claim 1, wherein the back-blowing device comprises an air compressor and a mass flow meter; the air compressor is respectively connected with the smoke parameter acquisition device, the sampling probe, the pretreatment device and the gas chromatograph through an air blowing pipeline; the mass flow meter is arranged on the air blowing pipeline.
8. The fixed pollution source volatile organic compound continuous monitoring system according to claim 1, further comprising: a mobile terminal and a PC; the mobile terminal and the PC are respectively connected with the PLC; and the mobile terminal and the PC are connected with a remote client or an environment-friendly platform in a wireless transmission mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210097548.7A CN114414717A (en) | 2022-01-27 | 2022-01-27 | Continuous monitoring system for volatile organic compounds of fixed pollution source |
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| CN202210097548.7A CN114414717A (en) | 2022-01-27 | 2022-01-27 | Continuous monitoring system for volatile organic compounds of fixed pollution source |
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| CN202210097548.7A Pending CN114414717A (en) | 2022-01-27 | 2022-01-27 | Continuous monitoring system for volatile organic compounds of fixed pollution source |
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