CN108132216B - Single-end in-situ pipeline gas detection device and working method thereof - Google Patents
Single-end in-situ pipeline gas detection device and working method thereof Download PDFInfo
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- CN108132216B CN108132216B CN201711437964.2A CN201711437964A CN108132216B CN 108132216 B CN108132216 B CN 108132216B CN 201711437964 A CN201711437964 A CN 201711437964A CN 108132216 B CN108132216 B CN 108132216B
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- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
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- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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Abstract
The invention provides a single-end in-situ pipeline internal gas detection device and a working method thereof, wherein the gas detection device comprises a light source, a detector, a purging unit and a first pipe extending into the pipeline, and a part of the first pipe extending into the pipeline is provided with a notch facing away from the direction of air flow in the pipeline; the single-ended in-situ pipeline gas detection device further comprises: the first isolation component is arranged on a measuring light path emitted by the light source so as to transmit the measuring light and isolate the light source from the gas in the pipeline; a sealing member having elasticity on one side or both sides of the first isolation member in the measuring light direction; the driving unit transmits energy to the first isolation member so that the first isolation member vibrates back and forth along the optical path direction of the measuring light. The invention has the advantages of high detection precision and the like.
Description
Technical Field
The invention relates to gas detection, in particular to a single-ended in-situ pipeline gas detection device and a working method thereof.
Background
For in-situ measurement gas analysis instruments, in order to protect the optical system of the analysis instrument from being polluted by dust and oil stains in the process gas, clean high-pressure nitrogen or instrument level compressed air is usually used for purging protection.
The single-ended in-situ laser gas analyzer has the following advantages over the through-the-hole laser analyzer:
1. the installation is convenient, only one hole is needed for installation, only a single-side platform is needed, only a single-side cable is needed, only materials such as a valve and the like are needed, and the engineering installation cost is reduced;
2. the installation has small space requirement, and only single-end installation can be carried out on occasions with insufficient part of installation space;
3. the equipment is light in weight, can be operated by one person, and reduces maintenance difficulty and workload;
4. the dimming is convenient, dimming on two sides is not needed, one person can operate, and maintenance difficulty and workload are reduced.
However, the single-end laser gas analyzer has the following problems in the use process:
1. because the reflecting end is inserted into the pipeline, the reflecting lens is easily polluted by process gas, and after the reflected light intensity is reduced to a critical point due to pollution, the instrument cannot normally measure;
2. after the reflecting lens is polluted, the inside of the pipeline is aerated, so that the maintenance is difficult.
For the in-situ gas analysis instrument with the purging structure, when the pressure of the gas in the pipeline is stable, the analysis instrument can accurately reflect the real concentration of the gas in the pipeline; when the pressure of the gas in the pipeline fluctuates, the concentration value of the gas output by the analysis instrument fluctuates, and the actual concentration of the gas in the pipeline cannot be truly reflected.
The above problems have plagued manufacturers of in-situ gas analysis instruments and have not been able to find the reasons for the problems. In order to solve the above problems, a solution of sampling the gas in the pipeline, i.e. filtering, cooling, depressurizing, dewatering, etc. to obtain clean gas which is low in temperature, low in pressure and does not contain liquid water, and then detecting the gas by using an analysis instrument is proposed. The scheme can accurately know the real concentration of the gas in the pipeline, but also has the defects of long delay time, complex pretreatment structure, high cost, low reliability and the like.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the single-end in-situ type in-pipeline gas detection device which can remove the gas pollution optical device in the pipeline and has good reliability.
A single-end in-situ pipeline gas detection device, which comprises a light source, a detector, a purging unit and a first pipe extending into the pipeline, wherein the purging unit is communicated with the interior of the first pipe; the part of the first pipe extending into the pipeline is provided with a notch facing away from the direction of air flow in the pipeline; the single-ended in-situ pipeline gas detection device further comprises:
the first isolation component is arranged on a measuring light path emitted by the light source so as to transmit the measuring light and isolate the light source from the gas in the pipeline; a sealing member having elasticity on one side or both sides of the first isolation member in the measuring light direction;
and the driving unit transmits energy to the first isolation component, so that the first isolation component vibrates back and forth along the optical path direction of the measuring light.
According to the single-ended in-situ in-pipe gas detection device described above, optionally, the single-ended in-situ in-pipe gas detection device further includes:
a reflecting mirror provided at an end of the first pipe extending into the pipe;
the second isolation component is arranged on the measuring light path emitted by the light source so as to transmit the measuring light and isolate the reflector from the gas in the pipeline; a sealing member having elasticity along one or both sides of the second isolation member in the measuring light direction;
the gas provided by the purging unit purges the side of the second isolation part, which is opposite to the reflecting mirror.
According to the single-ended in-situ in-pipe gas detection device, optionally, the driving unit transfers energy to the second isolation component, so that the second isolation component vibrates back and forth along the optical path direction of the measurement light.
According to the single-ended in-situ pipe gas detection device described above, preferably, the driving unit is an ultrasonic energy generator, and is connected to the first isolation member.
According to the single-ended in-situ in-pipe gas detection device described above, optionally, the single-ended in-situ in-pipe gas detection device further includes:
a second pipe disposed inside or outside the first pipe;
and the power unit drives the second pipe to move back and forth along the length direction of the first pipe, and the gap is partially blocked, so that the length of the gap along the measuring light path direction is increased or decreased.
According to the single-ended in-situ in-pipe gas detection device described above, optionally, the purge unit includes:
and the flow adjustment module is used for adjusting the flow of the purge gas so as to superimpose periodic flow change on the basis of the basic flow.
According to the single-ended in-situ in-pipe gas detection device described above, preferably, the flow rate change is a flow rate increase.
According to the single-ended in-situ apparatus for detecting gas in a pipe, preferably, the notched portion of the first pipe has an arc shape or V shape or [ shape ] in cross section along the direction of gas flow in the pipe.
According to the single-ended in-situ in-pipe gas detection device described above, optionally, the single-ended in-situ in-pipe gas detection device further includes:
the adjusting plate is arranged on the measuring light path and is positioned at one side of the first isolation component, which is opposite to the light source; the adjusting plate is provided with through holes, and the distribution of the through holes on the adjusting plate is sparse in the middle and dense in the periphery.
The invention also aims to provide a working method of the single-end in-situ pipeline gas detection device, which is realized by the following technical scheme:
according to the working method of the single-end in-situ pipeline gas detection device, the working method comprises the following steps:
a purge gas enters the first pipe and then flows into the pipeline, so that the purge gas is arranged between the first isolation part and the gas in the pipeline to prevent the gas in the pipeline from contacting the first isolation part;
the drive unit transmits the capability to the first isolation part, so that the first isolation part vibrates back and forth along the optical path direction of the measuring light, and particulate matters are prevented from being stained on the first isolation part.
Compared with the prior art, the invention has the following beneficial effects:
1. clean purge gas is introduced between the isolation component and the optical device, so that unclean gas (containing pollutants such as particles and the like which pollute the optical device) in the pipeline is prevented from contacting the optical device and the isolation component, and the operation stability and reliability of the gas detection device are improved;
the pollutants such as particles on the isolation component are removed by utilizing the vibration of the isolation component, so that a self-cleaning function is realized, and the operation stability and reliability of the gas detection device are further improved;
2. in view of the problems existing in the prior art, the applicant analyzes as follows:
in an in-situ gas detection device with a purge unit, purge gas is continuously blown into a pipe to be tested, and an isolation area is formed between a medium to be tested and an instrument optical system. The flow rate of the purge gas blown into the pipe determines the "effect of the purge gas shielding" and the "length of the measurement optical path (measurement optical path)".
The flow rate of the purging gas is determined by the difference between the purging gas source and the pressure of the gas to be measured in the pipeline, the larger the pressure difference is, the larger the kinetic energy of the purging gas on the surface of the optical glass is, the stronger the purging force is, and dust is not easy to adhere; meanwhile, the larger the flow is under the condition that the air path is unchanged, the better the blocking effect is, and the less easily the measured gas contacts the protected surface; the measuring optical path is correspondingly shortened under the condition of a certain flow rate of the pipeline, so that the measured concentration value is reduced.
Therefore, in the purging system, the difference between the pressure of the purging gas source and the pressure of the detected gas in the pipeline is a very critical factor, in practical application, the pressure of the detected gas in the pipeline is always changed, and the pressure of the purging gas source is constant, so that the pressure difference of the purging gas source and the pressure of the purging gas source is changed, and the actual purging flow rate is continuously changed, thus the purging protection effect is poor, and the concentration of the instrument is abnormally fluctuated due to the change of the optical path.
The balance component is creatively designed through the analysis of the prior problems by the applicant, so that the difference between the pressure of the purge gas entering the pipeline and the pressure of the gas in the pipeline is kept unchanged, namely the stability of the measuring optical path in the pipeline is ensured, and the abnormal fluctuation of the gas detection value caused by the fluctuation of the pressure of the gas in the pipeline is eliminated;
3. the sampling and pretreatment device is not needed, the structural complexity is reduced, the cost is reduced, and the reliability is also improved.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are only for illustrating the technical scheme of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic diagram of an in-situ in-pipeline gas detection device according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. In order to teach the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or alternatives derived from these embodiments that fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the invention is not limited to the following alternative embodiments, but only by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a schematic structural diagram of a single-ended in-situ in-pipe gas detection device according to an embodiment of the present invention, as shown in fig. 1, including:
a light source, a detector and a first tube 4 extending into the pipe 1, wherein the part of the first tube 4 extending into the pipe 1 is provided with a notch facing away from the direction of air flow in the pipe; the section of the part with the notch of the first pipe along the air flow direction in the pipeline is arc-shaped or V-shaped or [ shaped;
a first isolation member 2 such as a glass slide, the first isolation member 2 being disposed on a measuring light path emitted from the light source to transmit the measuring light and isolate the light source from the gas in the pipe; a sealing member having elasticity on one side or both sides of the first isolation member in the measuring light direction;
a reflecting mirror provided at an end of the first pipe extending into the pipe;
a second isolation member 7 which is provided on the optical path of the measurement light emitted from the light source to transmit the measurement light and isolates the mirror from the gas in the pipe; a sealing member having elasticity along one or both sides of the second isolation member in the measuring light direction;
the purging unit is communicated with the inside of the first pipe 4, and the gas provided by the purging unit purges one side of the second isolation part, which is opposite to the reflector, so that clean purging gas is arranged between the first isolation part and the gas in the pipeline and between the second isolation part and the gas in the pipeline;
a drive unit 5, such as an ultrasonic energy generator, which transmits energy to the first isolation member so that the first isolation member vibrates back and forth in the direction of the optical path of the measuring light; the driving unit transmits energy to the second isolation component, so that the second isolation component vibrates back and forth along the optical path direction of the measuring light;
a second pipe 6 provided inside or outside the first pipe;
the power unit drives the second tube to move back and forth along the length direction of the first tube, and the gap is partially blocked, so that the length of the gap along the measuring light path direction is increased or decreased;
a valve 3, such as a ball valve, said valve 3 being arranged between said first isolation member and the first pipe, the interior being adapted to measure the passage of light;
a gas source providing a clean, dry purge gas, such as nitrogen, free of the gas component to be measured; the outlet of the air source is connected with the flow adjusting module and the balance component;
the flow adjustment module is used for adjusting the flow of the purge gas so as to superimpose periodic flow changes on the basis of the basic flow, wherein the flow changes are flow increases;
the inlet of the switching component is respectively communicated with the flow adjusting module and the balancing component, and the outlet of the switching component is communicated with the interior of the first pipe; selectively communicating the flow adjustment module with the balance member so that the interior of the first tube;
the adjusting plate is arranged on the measuring light path and is positioned at one side of the first isolation component, which is opposite to the light source; the adjusting plate is provided with through holes, and the distribution of the through holes on the adjusting plate is sparse in the middle and dense in the periphery;
a balancing member, the balancing member comprising:
one end of the cylindrical part is communicated with the inside of the pipeline through a pipeline;
a piston disposed within the barrel;
one end of the spring is fixed on the piston, and the other end of the spring is fixed on the cylindrical part;
a gas inlet and a gas outlet provided on opposite sides of the cylindrical member, the gas outlet communicating with the switching member; the overlapping area S between the side surface of the piston and the gas outlet 1 And a cross-sectional area S of the gas outlet 2 The ratio M epsilon 0,1]And a change DeltaS of the overlapping area 1 The relationship with the deformation amount deltax of the spring is: ΔS 1 =k·Δx, k is a constant, and
P into (I) K is the stiffness coefficient of the spring, S is the gas pressure at the gas inlet 3 Is the cross-sectional area of the piston perpendicular to the direction of movement.
The working method of the in-situ pipeline gas detection device according to the embodiment of the invention comprises the following steps:
in the working state, through the switching of the switching component, the purge gas sequentially passes through the gas inlet, the cylindrical component, the gas outlet and the switching component and then enters the first pipe and finally enters the pipeline, so that clean purge gas is arranged between the first isolation component and the gas in the pipeline and between the second isolation component and the gas in the pipeline; the gas pressure P at the gas outlet Out of And the pressure P of the gas in the pipeline Pipe The difference of (2) is ΔP;
the gas pressure at the gas inlet remains unchanged;
pressure P of gas in pipe Pipe Change by delta P Pipe The method comprises the steps of carrying out a first treatment on the surface of the The spring pushes the piston to move, and the overlapped area (namely the area for blocking the gas outlet) S 1 Change is made so that the gas pressure P at the gas outlet Out of Change by delta P Out of ＝ΔP Pipe I.e. the gas pressure P at the gas outlet Out of And the pressure P of the gas in the pipeline Pipe The difference of the two is delta P, so that the measuring optical path of the measuring light in the pipeline is unchanged, and abnormal fluctuation of gas parameters such as concentration caused by the change of the gas pressure in the pipeline during the detection of the gas in the pipeline is eliminated;
simultaneously, the driving unit transmits the capacity to the first isolation component, so that the first isolation component vibrates back and forth along the light path direction of the measuring light, and particulate matters are prevented from being stained on the first isolation component;
in a maintenance state, through the switching of the switching component, the purge gas provided by the gas source enters the flow adjustment module, and the flow adjustment module adjusts the flow of the purge gas so as to superimpose periodic flow changes on the basis of basic flow, wherein the flow changes are flow increases; the first and second barrier members are cleaned by causing particles attached to the first and second barrier members to fall through a change in the flow rate of the purge gas.
Example 2:
the single-ended in-situ pipeline gas detection device and the working method thereof according to the embodiment 1 of the invention are applied to the detection of the concentration of the gas in the pipeline.
In this application example, the in-situ in-pipe gas detection device includes:
the light source is used for emitting measuring light into the pipeline after passing through the purging unit at one side of the pipeline, and the measuring light is received by the detector after passing through the purging unit at the other side of the pipeline after interacting with the gas in the pipeline;
a detector that converts the received optical signal into an electrical signal; the light source and the detector are arranged on two opposite sides of the pipeline;
the analysis unit is used for processing the electric signals by utilizing an absorption spectrum technology so as to obtain the content of the gas in the pipeline;
in the balance member, the cross-sectional area of the gas inlet is S 2 And the projections of the gas inlet and the gas outlet on a plane perpendicular to the central axis of the gas outlet coincide; the sections of the gas inlet and the gas outlet perpendicular to the central axis of the gas inlet and the gas outlet are rectangular, the wide extending direction of the rectangle is parallel to the moving direction of the piston, the long extending direction of the rectangle is perpendicular to the moving direction of the piston, and k is the length value of the rectangle; the other end of the cylindrical part is closed, and one end of the spring is fixed at the closed end; one end of the spring is fixed on the side of the piston, which is opposite to the pipeline.
The working method of the in-situ pipeline gas detection device according to the embodiment of the invention comprises the following steps:
the purge gas sequentially passes through the gas inlet, the cylindrical part, the gas outlet and the purge unit and then enters the pipeline; the gas pressure P at the gas outlet Out of And the pressure P of the gas in the pipeline Pipe The difference of (2) is ΔP; the purge gas does not contain the gas to be detected in the pipeline or contains the gas to be detected with known concentration;
the gas pressure at the gas inlet remains unchanged;
pressure P of gas in pipe Pipe Change by delta P Pipe The method comprises the steps of carrying out a first treatment on the surface of the Spring-urged piston movement, said overlap area S 1 The change is made in such a way that,
so that the gas pressure P at the gas outlet Out of Changes the quantity of ∈>
I.e. the gas pressure P at the gas outlet Out of And the pressure P of the gas in the pipeline Pipe The difference of the two is delta P, so that the measuring optical path of the measuring light in the pipeline is unchanged, and the detection of the gas in the pipeline is eliminatedAbnormal fluctuations in gas parameters such as concentration due to variations in gas pressure within the pipe. />
Claims (10)
1. A single-end in-situ pipeline gas detection device, which comprises a light source, a detector, a purging unit and a first pipe extending into the pipeline, wherein the purging unit is communicated with the interior of the first pipe; the part of the first pipe extending into the pipeline is provided with a notch facing away from the direction of air flow in the pipeline; the method is characterized in that: the single-ended in-situ pipeline gas detection device further comprises:
the first isolation component is arranged on a measuring light path emitted by the light source so as to transmit the measuring light and isolate the light source from the gas in the pipeline; a sealing member having elasticity on one side or both sides of the first isolation member in the measuring light direction;
a driving unit that transmits energy to the first isolation member such that the first isolation member vibrates back and forth along the measuring light path direction;
a balancing member, the balancing member comprising:
one end of the cylindrical part is communicated with the inside of the pipeline through a pipeline;
a piston disposed within the barrel;
one end of the spring is fixed on the piston, and the other end of the spring is fixed on the cylindrical part;
a gas inlet and a gas outlet disposed on opposite sides of the barrel, the gas outlet communicating with the first tube, the gas inlet communicating with a purge gas; the overlapping area S between the side surface of the piston and the gas outlet 1 And a cross-sectional area S of the gas outlet 2 The ratio M epsilon 0,1]And a change DeltaS of the overlapping area 1 The relationship with the deformation amount deltax of the spring is: ΔS 1 =k·Δx, k is a constant, and
，P into (I) K is the stiffness coefficient of the spring, S is the gas pressure at the gas inlet 3 Is the cross-sectional area of the piston perpendicular to the direction of movement.
2. The single-ended in-situ pipeline gas detection device of claim 1, wherein: the single-ended in-situ pipeline gas detection device further comprises:
a reflecting mirror provided at an end of the first pipe extending into the pipe;
the second isolation component is arranged on the measuring light path emitted by the light source so as to transmit the measuring light and isolate the reflector from the gas in the pipeline; a sealing member having elasticity along one or both sides of the second isolation member in the measuring light direction;
the gas provided by the purging unit purges the side of the second isolation part, which is opposite to the reflecting mirror.
3. The single-ended in-situ pipeline gas detection device of claim 2, wherein: the driving unit transmits energy to the second isolation member so that the second isolation member vibrates back and forth along the optical path direction of the measuring light.
4. A single-ended in-situ pipeline gas detection apparatus as claimed in claim 3 wherein: the drive unit is an ultrasonic energy generator coupled to the first isolation member.
5. The single-ended in-situ pipeline gas detection device of claim 1, wherein: the single-ended in-situ pipeline gas detection device further comprises:
a second pipe disposed inside or outside the first pipe;
and the power unit drives the second pipe to move back and forth along the length direction of the first pipe, and the gap is partially blocked, so that the length of the gap along the measuring light path direction is increased or decreased.
6. The single-ended in-situ pipeline gas detection device of claim 1, wherein: the purge unit includes:
and the flow adjustment module is used for adjusting the flow of the purge gas so as to superimpose periodic flow change on the basis of the basic flow.
7. The single-ended in-situ pipeline gas detection device of claim 6, wherein: the flow change is a flow increase.
8. The single-ended in-situ pipeline gas detection device of claim 6, wherein: the notched portion of the first tube is arcuate or V-shaped or [ shaped ] in cross-section along the direction of airflow within the duct.
9. The single-ended in-situ pipeline gas detection device of claim 1, wherein: the single-ended in-situ pipeline gas detection device further comprises:
the adjusting plate is arranged on the measuring light path and is positioned at one side of the first isolation component, which is opposite to the light source; the adjusting plate is provided with through holes, and the distribution of the through holes on the adjusting plate is sparse in the middle and dense in the periphery.
10. The method of operating a single-ended in-situ pipeline gas detection apparatus according to any one of claims 1-9, the method of operating comprising:
the purge gas enters the first pipe and then flows into the pipeline, so that the purge gas is arranged between the first isolation component and the gas in the pipeline, and the gas in the pipeline is prevented from contacting the first isolation component;
the drive unit transmits the capability to the first isolation part, so that the first isolation part vibrates back and forth along the optical path direction of the measuring light, and particulate matters are prevented from being stained on the first isolation part.
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| CN110006492A (en) * | 2019-03-26 | 2019-07-12 | 北京科益虹源光电技术有限公司 | A kind of gas collecting monitoring method and system for excimer laser |
| CN113551097B (en) * | 2021-06-04 | 2022-04-29 | 清华大学 | In-situ cross-penetration tubular pretreatment device based on gas streaming |
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