CN108717051B - Device and method for measuring natural gas calorific value by combining TDLAS (tunable diode laser absorption spectroscopy) and photoacoustic spectroscopy - Google Patents
Device and method for measuring natural gas calorific value by combining TDLAS (tunable diode laser absorption spectroscopy) and photoacoustic spectroscopy Download PDFInfo
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- CN108717051B CN108717051B CN201810601023.6A CN201810601023A CN108717051B CN 108717051 B CN108717051 B CN 108717051B CN 201810601023 A CN201810601023 A CN 201810601023A CN 108717051 B CN108717051 B CN 108717051B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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Abstract
The invention discloses a device and a method for measuring the heat value of natural gas by combining TDLAS and photoacoustic spectroscopy, which comprise a pipeline and a detection box, wherein the two sides of the detection box are communicated with a first pushing box, the inside of the detection box is fixedly connected with a partition plate, an elastic film is fixedly connected between the top of the partition plate and the top of an inner cavity of the detection box, and a laser emitter is fixedly connected to the top of the partition plate and positioned in the elastic film, so that the device belongs to the technical field of optical measurement devices. According to the device and the method for measuring the heat value of the natural gas by combining the TDLAS and the photoacoustic spectrum, an independent small space can be separated by the elastic membrane, the top of the elastic membrane can be sealed by the aid of the cooperation of the first electric telescopic rod and the clamping plate, after the elastic membrane is separated from a natural gas large pipeline, even if ignition is caused by electric leakage, the natural gas in the large pipeline cannot be influenced, and the heat value of the natural gas can be conveniently and accurately detected by the aid of the cooperation of the laser transmitter and the laser receiver, and the device is safe, accurate and efficient.
Description
Technical Field
The invention relates to the technical field of optical measurement devices, in particular to a device and a method for measuring the heat value of natural gas by combining TDLAS and photoacoustic spectroscopy.
Background
Natural gas refers to all gases naturally occurring in nature, including gases formed by various natural processes in the atmosphere, water and rock circles (including oilfield gas, gas field gas, mudstone gas, coal bed gas, and biogenic gases, etc.). The definition of "natural gas" has been used for a long time in a narrow definition from the viewpoint of energy, and refers to a mixture of hydrocarbon and non-hydrocarbon gases that are naturally deposited in a formation. In petrogeology, oilfield gas and gas field gas are commonly referred to. The composition is based on hydrocarbons and contains non-hydrocarbon gases. Natural gas is deposited in underground porous formations, including oilfield gas, gas field gas, coalbed gas, mudguard gas, and biogenic gas, to name a few. It is a high-quality fuel and chemical raw material. The natural gas is mainly used as fuel, carbon black, chemicals and liquefied petroleum gas can be produced, and propane and butane produced from natural gas are important raw materials in modern industry. Natural gas is composed primarily of a mixture of gaseous low molecular hydrocarbons and non-hydrocarbon gases.
In the existing natural gas detection, one of the detection methods for the heat value of the natural gas is available, but the detection of the natural gas in a pipeline is inconvenient, the detection is directly performed by using an electronic element in the pipeline, the natural gas is possibly burnt due to overlarge current, and then danger is caused, the accuracy is influenced by the detection indirectly through a thin film or a heat conductor, meanwhile, the existing detection method for the heat value of the natural gas generally does not have a detection method for combining TDLAS and photoacoustic spectroscopy at the same time, so that the detection method for the heat value of the natural gas has singleness and limitation in use.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a device and a method for measuring the heat value of natural gas by combining TDLAS and photoacoustic spectroscopy, which solve the problems that the detection is directly carried out by using an electronic element in a pipeline, the natural gas is possibly burnt due to overlarge current, the danger is caused, and the accuracy is influenced by indirect detection through a film or a heat conductor.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a device and method of TDLAS and optoacoustic spectrum combination survey natural gas calorific value, includes pipeline and detection case, the both sides of detection case all communicate and have first promotion box, the inside fixedly connected with baffle of detection case, fixedly connected with elastic membrane between the top of baffle and the top of detection case inner chamber, the top of baffle just is located the inside fixedly connected with laser emitter of elastic membrane, the top of baffle just is located the left and right sides of laser emitter and fixedly connected with conduit and bracing piece respectively, fixedly connected with mount between the top of conduit and bracing piece, the inside fixedly connected with laser receiver of mount.
The inside fixedly connected with first electric telescopic handle of first promotion box, the inside sliding connection of first promotion box has the splint, the top fixed connection of fixed block and splint is passed through to the bottom of first electric telescopic handle one end, one side of splint runs through the detection case and extends to the inside of detection case, fixedly connected with piston cylinder between the bottom of baffle and the bottom of detection case inner chamber, the bottom fixedly connected with second of detection case promotes the box, the bottom fixedly connected with second electric telescopic handle of second promotion box inner chamber, the top fixedly connected with push rod of second electric telescopic handle, the top of push rod runs through the detection case and extends to the inside of piston cylinder, the top fixedly connected with piston of push rod, and the surface of piston and the internal surface sliding connection of piston cylinder.
Preferably, a circuit board is fixedly connected to the left side of the inner wall of the detection box and positioned below the partition plate.
Preferably, a USB socket penetrates through the left wall of the detection box and is positioned between the partition board and the circuit board.
Preferably, the bottom of detection case inner chamber just is located the right side fixedly connected with battery of piston cylinder, the right wall of detection case just is located the below of baffle and runs through there is button switch.
Preferably, the right side of the storage battery is fixedly connected with a charging port, and the right side of the charging port penetrates through the detection box and extends to the outside of the detection box.
Preferably, the right wall of the detection box and the top that is located the baffle run through and have the pressure release box, the left side intercommunication of pressure release box has the air inlet nozzle.
Preferably, the surface of the fixing frame is fixedly connected with a connecting rod, and one end of the connecting rod, which is far away from the fixing frame, is fixedly connected with a supporting ring.
Preferably, the first pushing box is fixedly connected with the surface of the pipeline through a connecting block, and the top of the detection box is communicated with the surface of the pipeline.
The invention also discloses a method for measuring the heat value of the natural gas by combining TDLAS and photoacoustic spectroscopy, which specifically comprises the following steps:
step one, a data wire is inserted into a USB socket to enable the device to be connected with a computer, a button switch is pressed down, a second electric telescopic rod is started firstly, the second electric telescopic rod drives a piston to do lifting and reciprocating motion through a push rod, so that the air pressure in an elastic membrane is changed, natural gas in a pipeline is pumped in, elements in the elastic membrane are preheated for a period of time, and the temperature of the elements is close to that of the natural gas.
Step two, press button switch once more, stop after the shrink of second electric telescopic handle, natural gas is full of the elastic membrane, then starts first electric telescopic handle, and first electric telescopic handle drives two splint and presss from both sides tight messenger's its sealedly with the elastic membrane, then starts laser emitter, laser emitter sends laser, laser receiver receives laser.
And thirdly, transmitting the measured data to a computer through a USB socket for processing, finally, pressing a button switch again to reset the element, charging the storage battery through a charging port at regular intervals, and when the laser emitter fails to cause current leakage and natural gas in the elastic membrane causes combustion, a small amount of natural gas in the elastic membrane is combusted completely and the elastic membrane is expanded rapidly, and the pressure in the detection box is released by the pressure relief box.
(III) beneficial effects
The invention provides a device and a method for measuring the heat value of natural gas by combining TDLAS and photoacoustic spectroscopy. The beneficial effects are as follows:
(1) This TDLAS combines device and method of survey natural gas calorific value with optoacoustic spectrum, through the inside fixedly connected with baffle at the detection case, fixedly connected with elastic membrane between the top of baffle and the top of detection case inner chamber, the top of baffle just is located the inside fixedly connected with laser emitter of elastic membrane, the top of baffle just is located the left and right sides of laser emitter and is fixedly connected with conduit and bracing piece respectively, fixedly connected with mount between the top of conduit and bracing piece, the inside fixedly connected with laser receiver of mount, the inside fixedly connected with electric telescopic handle of first promotion box, the inside sliding connection of first promotion box has splint, the bottom of first electric telescopic handle one end passes through the top fixed connection of fixed block and splint, one side of splint runs through the detection case and extends to the inside of detection case, can separate an independent little space through setting up elastic membrane, utilize first electric telescopic handle and splint's cooperation, can seal the elastic membrane top, after separating with the big pipeline of natural gas, even lead to catching fire because of also can not influence the natural gas in the big pipeline, and utilize the cooperation of laser emitter and laser receiver, can be accurate detection goes out the accurate safe and high-efficient of calorific value.
(2) According to the device and the method for measuring the heat value of the natural gas by combining the TDLAS and the photoacoustic spectrum, the piston cylinder is fixedly connected between the bottom of the partition plate and the bottom of the inner cavity of the detection box, the second pushing box is fixedly connected with the bottom of the inner cavity of the detection box, the second electric telescopic rod is fixedly connected with the top end of the second electric telescopic rod, the push rod is fixedly connected with the top end of the push rod, penetrates through the detection box and extends to the inside of the piston cylinder, the piston is fixedly connected with the top end of the push rod, the surface of the piston is in sliding connection with the inner surface of the piston cylinder, the air pressure in the piston cylinder and the elastic membrane can be changed by utilizing the cooperation of the second electric telescopic rod, the push rod and the piston, and then the natural gas in a pipeline can be conveniently pumped into the elastic membrane, and preheating and sampling before measurement are facilitated.
(3) According to the device and the method for measuring the heat value of the natural gas by combining the TDLAS and the photoacoustic spectrum, the pressure relief box penetrates through the right wall of the detection box and is positioned above the partition plate, the air inlet nozzle is communicated with the left side of the pressure relief box, the elasticity of the elastic membrane is large, when natural gas in the elastic membrane is accidentally combusted, the elastic membrane rapidly expands to cause the overlarge air pressure in the detection box, the pressure is relieved through the pressure relief box, and the pressure relief box has a dustproof effect during normal use.
Drawings
FIG. 1 is a cross-sectional view of a partial structure of the present invention;
FIG. 2 is a schematic view of the overall external structure of the present invention;
FIG. 3 is an enlarged view of a portion of the invention at A in FIG. 1;
fig. 4 is a partial enlarged view of the present invention at B in fig. 1.
In the figure, 1-pipeline, 2-detection case, 3-first pushing box, 4-baffle, 5-elastic membrane, 6-laser emitter, 7-conduit, 8-bracing piece, 9-mount, 10-laser receiver, 11-first electric telescopic rod, 12-splint, 13-fixed block, 14-piston cylinder, 15-second pushing box, 16-second electric telescopic rod, 17-push rod, 18-piston, 19-circuit board, 20-USB socket, 21-battery, 22-button switch, 23-charging port, 24-pressure release box, 25-connecting rod, 26-support ring, 27-connecting block.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, the embodiment of the present invention provides a technical solution: the device for measuring the heat value of the natural gas by combining TDLAS and photoacoustic spectroscopy comprises a pipeline 1 and a detection box 2, wherein a circuit board 19 is fixedly connected to the left side of the inner wall of the detection box 2 and positioned below a partition board 4, a USB socket 20 is penetrated between the partition board 4 and the circuit board 19, the bottom of an inner cavity of the detection box 2 and positioned on the right side of a piston cylinder 14 are fixedly connected with a storage battery 21, a button switch 22 is penetrated on the right side of the detection box 2 and positioned below the partition board 4, a charging port 23 is fixedly connected to the right side of the storage battery 21, the right side of the charging port 23 penetrates the detection box 2 and extends to the outside of the detection box 2, a pressure relief box 24 is penetrated on the right side of the detection box 2 and positioned above the partition board 4, an air inlet nozzle is communicated to the left side of the pressure relief box 24, the elasticity of an elastic membrane 5 is larger, when natural gas in the elastic membrane 5 is combusted, the elastic membrane 5 rapidly expands to cause the overlarge air pressure in the detection box 2, the pressure can be released through the pressure release box 24, the pressure release box 24 plays a dustproof effect during normal use, the two sides of the detection box 2 are communicated with the first pushing box 3, the first pushing box 3 and the top of the surface of the detection box 2 are fixedly connected with the surface of the pipeline 1 through the connecting block 27, the top of the detection box 2 is communicated with the surface of the pipeline 1, the inner part of the detection box 2 is fixedly connected with the baffle plate 4, the elastic membrane 5 is fixedly connected between the top of the baffle plate 4 and the top of the inner cavity of the detection box 2, the elastic membrane 5 is made of fireproof materials, when the internal natural gas burns, the internal space is small, the stored natural gas is less, serious explosion does not occur, the top of the baffle plate 4 is fixedly connected with the laser transmitter 6 inside the baffle plate 4 and the laser transmitter 6 is matched with the laser receiver 10, can detect calorific value according to the principle of optoacoustic spectrum, the top of baffle 4 just is located laser emitter 6's left and right sides fixedly connected with conduit 7 and bracing piece 8 respectively, and laser receiver 10 is inside the wire that laser receiver 10 was used, fixedly connected with mount 9 between the top of conduit 7 and bracing piece 8, and the fixed surface of mount 9 is connected with connecting rod 25, and the one end fixedly connected with holding ring 26 of mount 9 is kept away from to connecting rod 25, the inside fixedly connected with laser receiver 10 of mount 9.
The first electric telescopic rod 11 is fixedly connected with the inside of the first pushing box 3, the clamping plate 12 is slidingly connected with the inside of the first pushing box 3, the bottom of one end of the first electric telescopic rod 11 is fixedly connected with the top of the clamping plate 12 through the fixing block 13, one side of the clamping plate 12 penetrates through the detection box 2 and extends to the inside of the detection box 2, an independent small space can be separated by arranging the elastic membrane 5, the top of the elastic membrane 5 can be sealed by utilizing the cooperation of the first electric telescopic rod 11 and the clamping plate 12, after the elastic membrane is separated from a natural gas large pipeline, even if the natural gas in the large pipeline is not influenced due to ignition caused by electric leakage, the cooperation of the laser emitter 6 and the laser receiver 10 can conveniently and accurately detect the heat value of the natural gas, the safety and the precision and the high efficiency are realized, the bottom of baffle 4 and the bottom of detecting box 2 inner chamber between fixedly connected with piston tube 14, the bottom fixedly connected with second of detecting box 2 promotes box 15, the bottom fixedly connected with second of second promotion box 15 inner chamber electric telescopic handle 16, the top fixedly connected with push rod 17 of second electric telescopic handle 16, the top of push rod 17 runs through detecting box 2 and extends to the inside of piston tube 14, the top fixedly connected with piston 18 of push rod 17, and the surface of piston 18 and the internal surface sliding connection of piston tube 14, utilize second electric telescopic handle 16, push rod 17 and piston 18's cooperation, can change the atmospheric pressure in piston tube 14 and the elastic membrane 5, and then can be convenient take out the natural gas in the pipeline 1 into the elastic membrane 5, preheat before the measurement and the sample of being convenient for.
The invention also discloses a method for measuring the heat value of the natural gas by combining TDLAS and photoacoustic spectroscopy, which is characterized in that: the method specifically comprises the following steps:
step one, a data wire is inserted into the USB socket 20 to enable the device to be connected with a computer, a button switch 22 is pressed, a second electric telescopic rod 16 is started first, the second electric telescopic rod 16 drives a piston 18 to do lifting and reciprocating motion through a push rod 17, so that the air pressure in the elastic membrane 5 is changed, natural gas in the pipeline 1 is pumped in, and the internal elements of the elastic membrane 5 are preheated for a period of time, so that the temperature of the elements is close to that of the natural gas.
Step two, press button switch 22 again, stop after the shrink of second electric telescopic handle 16, natural gas is full of elastic membrane 5, then starts first electric telescopic handle 11, and first electric telescopic handle 11 drives two splint 12 and presss from both sides tight messenger's elastic membrane 5 seal, then starts laser emitter 6, and laser emitter 6 sends laser, and laser receiver 10 receives laser.
And thirdly, transmitting the measured data to a computer through the USB socket 20, processing the data, finally pressing the button switch 22 again to reset the element, charging the storage battery 21 through the charging port 23 periodically, and when the laser emitter 6 fails to work, causing current leakage, a small amount of natural gas in the elastic membrane 5 to burn completely rapidly and expand the elastic membrane 5, the elastic membrane 5 expands rapidly, and the pressure relief box 24 leaks the air pressure in the detection box 2.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a device of TDLAS and optoacoustic spectrum combination survey natural gas calorific value, includes pipeline (1) and detection case (2), its characterized in that: the detection box is characterized in that first pushing boxes (3) are communicated with the two sides of the detection box (2), a partition plate (4) is fixedly connected to the inside of the detection box (2), an elastic membrane (5) is fixedly connected between the top of the partition plate (4) and the top of an inner cavity of the detection box (2), a laser transmitter (6) is fixedly connected to the top of the partition plate (4) and positioned in the elastic membrane (5), a conduit (7) and a supporting rod (8) are fixedly connected to the top of the partition plate (4) and positioned on the left side and the right side of the laser transmitter (6) respectively, a fixing frame (9) is fixedly connected between the conduit (7) and the top of the supporting rod (8), and a laser receiver (10) is fixedly connected to the inside of the fixing frame (9);
the inside fixedly connected with first electric telescopic handle (11) of first promotion box (3), the inside sliding connection of first promotion box (3) has splint (12), the top fixed connection of fixed block (13) and splint (12) are passed through to the bottom of first electric telescopic handle (11) one end, the inside that detects case (2) and extend to detection case (2) is run through to one side of splint (12), fixedly connected with piston cylinder (14) between the bottom of baffle (4) and the bottom of detection case (2) inner chamber, the bottom fixedly connected with second promotion box (15) of detection case (2), the bottom fixedly connected with second electric telescopic handle (16) of second promotion box (15) inner chamber, the top fixedly connected with push rod (17) of second electric telescopic handle (16), the top of push rod (17) runs through detection case (2) and extends to the inside of piston cylinder (14), the top fixedly connected with piston (18) of push rod (17), and the surface of piston (18) and the interior sliding connection of piston cylinder (14).
2. The device for measuring the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 1, wherein: the left side of the inner wall of the detection box (2) and the lower part of the partition plate (4) are fixedly connected with a circuit board (19).
3. The device for measuring the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 2, wherein: the left wall of the detection box (2) is positioned between the partition board (4) and the circuit board (19) and penetrates through a USB socket (20).
4. A device for measuring the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 3, wherein: the bottom of the inner cavity of the detection box (2) is fixedly connected with a storage battery (21) on the right side of the piston cylinder (14), and a button switch (22) penetrates through the right wall of the detection box (2) and is positioned below the partition plate (4).
5. The device for measuring the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 4, wherein: the right side of battery (21) fixedly connected with charges port (23), and the right side of charging port (23) runs through detection case (2) and extends to the outside of detection case (2).
6. The device for measuring the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 5, wherein: the right wall of detection case (2) and be located the top of baffle (4) and run through have pressure release box (24), the left side intercommunication of pressure release box (24) has the air inlet nozzle.
7. The device for measuring the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 1, wherein: the surface of the fixing frame (9) is fixedly connected with a connecting rod (25), and one end, far away from the fixing frame (9), of the connecting rod (25) is fixedly connected with a supporting ring (26).
8. The device for measuring the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 1, wherein: the top of first promotion box (3) and detection case (2) surface is all through connecting block (27) and the fixed surface connection of pipeline (1), and the top of detection case (2) communicates with the surface of pipeline (1).
9. A method for testing a device for testing the heating value of natural gas by combining TDLAS with photoacoustic spectroscopy according to claim 6, wherein: the method specifically comprises the following steps:
step one, a data wire is inserted into a USB socket (20) to enable the device to be connected with a computer, a button switch (22) is pressed, a second electric telescopic rod (16) is started firstly, the second electric telescopic rod (16) drives a piston (18) to do lifting reciprocating motion through a push rod (17), so that the air pressure in an elastic membrane (5) is changed, natural gas in a pipeline (1) is pumped in, and the internal elements of the elastic membrane (5) are preheated for a period of time, so that the temperature of the elements is close to the temperature of the natural gas;
step two, pressing the button switch (22) again, stopping the shrinkage of the second electric telescopic rod (16), filling the elastic membrane (5) with natural gas, starting the first electric telescopic rod (11), driving the two clamping plates (12) by the first electric telescopic rod (11) to clamp the elastic membrane (5) so as to seal the elastic membrane, starting the laser emitter (6), emitting laser by the laser emitter (6), and receiving the laser by the laser receiver (10);
step three, after the measured data are transmitted to a computer through the USB socket (20) and then are processed, finally, the button switch (22) is pressed again to reset the element, the storage battery (21) is charged through the charging port (23) periodically, when the laser emitter (6) fails to work, current leaks, a small amount of natural gas in the elastic membrane (5) is burned completely rapidly, the elastic membrane (5) is expanded rapidly, and the pressure in the detection box (2) is released by the pressure relief box (24).
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| CN201810601023.6A CN108717051B (en) | 2018-06-12 | 2018-06-12 | Device and method for measuring natural gas calorific value by combining TDLAS (tunable diode laser absorption spectroscopy) and photoacoustic spectroscopy |
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| CN201810601023.6A CN108717051B (en) | 2018-06-12 | 2018-06-12 | Device and method for measuring natural gas calorific value by combining TDLAS (tunable diode laser absorption spectroscopy) and photoacoustic spectroscopy |
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| CN108717051A CN108717051A (en) | 2018-10-30 |
| CN108717051B true CN108717051B (en) | 2023-09-22 |
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