CN115808404A - Methane humidity generator and method for calibrating natural gas moisture meter by using same - Google Patents
Methane humidity generator and method for calibrating natural gas moisture meter by using same Download PDFInfo
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- CN115808404A CN115808404A CN202111083876.3A CN202111083876A CN115808404A CN 115808404 A CN115808404 A CN 115808404A CN 202111083876 A CN202111083876 A CN 202111083876A CN 115808404 A CN115808404 A CN 115808404A
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Abstract
The invention discloses a methane humidity generator and a method for calibrating a natural gas moisture meter by using the same, wherein the methane humidity generator comprises a methane storage, a mixed gas storage, a humidity generating assembly and a pipeline system, the pipeline system comprises a first air inlet, a second air inlet, a first air outlet and a flow control assembly, the first air inlet is communicated with the air outlet of the methane storage, and the second air inlet is communicated with the air outlet of the mixed gas storage; the flow control assembly is arranged on the pipeline system, so that the outlet gas flow of the methane storage device and the mixed gas storage device is independently controllable; the humidity generation assembly is adjustable in humidity of the methane mixed gas, the humidity generation assembly is provided with a mixed gas inlet and a humidifying methane gas outlet, the mixed gas inlet is communicated with the first gas outlet, and the humidifying methane gas outlet is used for discharging the humidified methane mixed gas. The methane humidity generator is simple in structure and operation, and can provide methane mixed gas with various methane contents.
Description
Technical Field
The invention relates to the technical field of natural gas moisture measurement and test, in particular to a methane humidity generator and a method for calibrating a natural gas moisture meter by using the same.
Background
In the field of natural gas moisture metering testing, a gas containing water is slowly cooled, and the temperature at which water condenses is called the water dew point, or simply the dew point. The dew point of a gas is related to its moisture content, the higher the moisture the higher the dew point, and thus the dew point is commonly used to represent the moisture in natural gas. When the water content in the natural gas transported by the pipe is too high, the water in the natural gas is easy to dewe or frost in low-temperature weather, so that ice blockage is caused, and the operation safety of the natural gas pipeline is damaged. There is a need to accurately measure the moisture or dew point of natural gas.
Laser Tunable Absorption Spectroscopy (TDLAS) is a specific method for measuring moisture in natural gas, and has high measurement sensitivity, a lower moisture measurement limit of 2ppmv (ppmv, parts per million, volume ratio), a dew point of-71.7 ℃, and a high response speed. The TDLAS method has strong capability of resisting the interference of complex components of natural gas.
However, since the TDLAS method is a relative measurement method, calibration is required to measure the moisture content of the natural gas. The methane in the natural gas has the change of absorption intensity in the wavelength scanning range of the TDLAS, and can interfere with the moisture measurement result. Since more than 80% of natural gas is methane, the concentration and the moisture of the methane are different by 4 to 5 orders of magnitude, so that the interference cannot be ignored. Therefore, during the measurement and calibration process of the TDLAS method moisture meter, methane moisture is required to be used as a measurement object, and the composition of real natural gas is simulated to eliminate system errors. In order to simulate natural gas with different methane contents, the methane content of the humidity generated by the humidity generator should be adjustable.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a methane humidity generator which has a simple structure and is easy to operate and can provide a methane mixed gas with various methane contents and a method for calibrating a natural gas moisture meter using the same.
Disclosure of Invention
The invention provides a methane humidity generator and a method for calibrating a natural gas moisture meter by using the same.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a methane humidity generator, includes methane storage ware, mixes with gas storage ware, humidity generation assembly and pipe-line system, wherein:
the pipeline system comprises a first air inlet, a second air inlet, a first air outlet and a flow control assembly, the first air inlet is communicated with the air outlet of the methane storage device, and the second air inlet is communicated with the air outlet of the mixing gas storage device; the flow control assembly is arranged on the pipeline system and is used for enabling the outlet flow of the methane storage and the mixing gas storage to be independently controllable;
the humidity generation assembly is adjustable in humidity of the methane mixed gas, the humidity generation assembly is provided with a mixed gas inlet and a humidifying methane gas outlet, the mixed gas inlet is communicated with the first gas outlet, and the humidifying methane gas outlet is used for discharging the methane mixed gas after humidification.
The methane humidity generator that above-mentioned technical scheme provided is at specific application in-process, can be through the flow control subassembly that has among the pipe-line system alone control methane memory and the gas outlet flow who mixes with gas memory, and then can obtain the methane gas mixture of multiple methane content, the methane gas mixture who obtains enters into in the humidity generation subassembly through pipe-line system's first gas outlet, can take place the methane gas mixture after the humidification that the subassembly obtained and correspond with multiple dew point temperature through adjusting humidity, the methane gas mixture after the humidification uses in getting into follow-up equipment from the humidification methane gas outlet.
The methane humidity generator is simple in structure, can obtain methane mixed gas with various methane contents only by adjusting the flow control assembly in the pipeline system, and is simple to operate.
Preferably, the humidity generating assembly comprises a water tank, a temperature regulating device and a water vapor permeation tube, wherein the temperature regulating device is used for regulating the temperature of water in the water tank; the material of steam permeation tube has the water permeability, and runs through the water tank, the one end of steam permeation tube forms the gas mixture import, the other end forms humidification methane gas outlet.
Preferably, the temperature regulation device comprises a heating module and a cooling module.
Preferably, the water vapor permeation tube is a polypropylene permeation tube.
Preferably, the water vapor permeation tube satisfies the following condition:
the hardness is 78D-82D;
the wall thickness is 0.45mm-0.55mm;
the inner diameter is 2.45mm-2.55mm;
the length is 14.8m-15.6m.
Preferably, the middle portion of the water vapor permeation tube is wound in a roll-like structure.
Preferably, the pipeline system comprises a mixing pipeline, a first branch pipeline and a second branch pipeline, wherein one end of the mixing pipeline forms the first air outlet; one end of the first branch pipeline forms the first air inlet, the other end of the first branch pipeline is communicated with the mixing pipeline, and one end of the second branch pipeline forms the second air inlet, the other end of the second branch pipeline is communicated with the mixing pipeline.
Preferably, the flow control assembly comprises: the first flow control valve is arranged on the first branch pipeline, and the second flow control valve is arranged on the second branch pipeline.
Preferably, a gas outlet of the methane storage is provided with a pressure reducing valve, and a gas outlet of the mixed gas storage is provided with a pressure reducing valve.
Preferably, the device further comprises an adjusting pipeline, wherein the air inlet of the moisture meter to be calibrated is communicated with the humidifying methane air outlet, the air inlet of the standard moisture meter serving as a standard is communicated with the air outlet of the moisture meter to be calibrated, one end of the adjusting pipeline is communicated with the air outlet of the moisture meter to be calibrated, and the adjusting pipeline is provided with a flow adjusting assembly.
The invention also provides a method for calibrating the natural gas moisture meter, which adopts any one methane humidity generator provided in the technical scheme, obtains methane mixed gas with various methane contents by adjusting the flow control assembly, and obtains various humidified methane mixed gas with dew point temperature requirements by adjusting the humidity generating assembly; calibrating the natural gas moisture meter according to various combinations of various methane contents and various dew point temperatures of the methane mixed gas; the method for calibrating the natural gas moisture meter according to the combination of each set of methane content and dew point temperature comprises the following steps:
after the dew point value of the humidified methane mixed gas is stable, acquiring a plurality of dew point value sets, wherein each dew point value set comprises a dew point value of a standard natural gas moisture meter and a dew point value of a natural gas moisture meter to be calibrated, and a set time is set between two adjacent acquisition operations;
and according to the acquired dew point value group data, taking the average value of the dew point values of the standard natural gas moisture meter acquired for multiple times as a standard value, taking the average value of the dew point values of the natural gas moisture meter to be calibrated acquired for multiple times as a measured value, and calculating the indication value error of the natural gas moisture meter to be calibrated according to the acquired standard value and the measured value so as to calibrate the natural gas moisture meter to be calibrated.
Preferably, when the pipeline system includes a mixing pipeline, a first branch pipeline and a second branch pipeline, and the flow control assembly includes a first flow control valve disposed in the first branch pipeline and a second flow control valve disposed in the second branch pipeline, the obtaining of the methane mixed gas with a plurality of methane contents by adjusting the flow control assembly includes:
and controlling the gas outlet speeds of the methane storage and the mixing gas storage through the first flow valve and the second flow valve to obtain the methane mixed gas with various methane contents.
Preferably, when the humidity generating assembly comprises a water tank, a temperature adjusting device and a water vapor permeation tube, the humidified methane mixed gas obtained by adjusting the humidity generating assembly to obtain various dew point temperature requirements comprises:
through temperature regulation apparatus adjusts the temperature of water in the water tank, adjusts the speed that vapor infiltration water vapor permeation tube, adjusts methane gas mixture's humidity to obtain the methane gas mixture after the humidification of multiple dew point temperature requirement.
Drawings
Fig. 1 is a schematic structural diagram of a methane humidity generator according to an embodiment of the present invention.
In the figure:
1-a methane storage; 11-a pressure reducing valve; 2-mixed gas storage; 21-a pressure reducing valve; 3-a pipeline system; 31-a flow control assembly; 311-a first flow control valve; 312-a second flow control valve; 32-a first branch line; 33-a second branch line; 34-a mixing line; 4-a humidity generating component; 41-a water tank; 42-vapor permeation tube; 5-natural gas moisture meter to be calibrated; 6-standard natural gas moisture meter; 7-adjusting the pipeline; 71-flow regulating assembly.
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.
As shown in fig. 1, the present embodiment provides a methane humidity generator, which includes a methane storage 1, a mixed gas storage 2, a humidity generating assembly 4, and a pipeline system 3, wherein:
the pipeline system 3 comprises a first air inlet, a second air inlet, a first air outlet and a flow control assembly 31, wherein the first air inlet is communicated with the air outlet of the methane storage device 1, and the second air inlet is communicated with the air outlet of the mixed gas storage device 2; the flow control assembly 31 is arranged on the pipeline system 3 and is used for enabling the outlet gas flow of the methane storage 1 and the mixing gas storage 2 to be independently controllable; the structure of the pipeline system 3 can realize the control of the gas outlet flow of the methane storage 1 and the gas outlet flow of the mixed gas storage 2 by adjusting the flow control assembly 31, and further can obtain the methane mixed gas with corresponding methane content, specifically, the mixed gas can be nitrogen, that is, the mixed gas storage 2 is a nitrogen storage.
Specifically, under the control of the pipeline system 3, the gas outlet flow of the methane storage 1 and the gas outlet flow of the nitrogen storage can control the content (volume ratio) of methane in the finally obtained methane mixed gas, in the methane humidity generator, the humidity of the methane mixed gas can be adjusted by the humidity generation assembly 4, the humidity generation assembly 4 is provided with a mixed gas inlet and a humidified methane outlet, the mixed gas inlet is communicated with the first gas outlet, and the humidified methane outlet is used for discharging the humidified methane mixed gas.
The methane humidity generator that above-mentioned technical scheme provided is in specific use, can be through the flow control subassembly 31 that has in pipe-line system 3 alone control methane memory 1 and mix with the gas storage 2 flow of giving vent to anger, and then can obtain the methane gas mixture of multiple methane content, the methane gas mixture who obtains enters into humidity through pipe-line system 3's first gas outlet and takes place in the subassembly 4, can take place the methane gas mixture after the humidification that subassembly 4 corresponds with multiple dew point temperature through adjusting humidity, the methane gas mixture after the humidification gets into follow-up equipment from the humidification methane gas outlet and uses.
The methane humidity generator is simple in structure, can obtain methane mixed gas with various methane contents only by adjusting the flow control assembly 31 in the pipeline system 3, and is simple to operate.
In an alternative implementation manner, in the methane humidity generator provided in the above embodiment, the humidity generating assembly 4 includes a water tank 41, a temperature adjusting device, and a water vapor permeation tube 42, the temperature adjusting device is used for adjusting the temperature of water in the water tank 41; the water vapor permeation tube 42 is made of a water permeable material and penetrates the water tank 41, a mixed gas inlet is formed at one end of the water vapor permeation tube 42, and a humidified methane outlet is formed at the other end of the water vapor permeation tube.
In the above-mentioned subassembly 4 takes place for humidity, after methane gas mixture lets in steam permeation tube 42, when the temperature adjustment of water in 41 water tank is to different temperatures through temperature regulation device, the rate that steam permeates into steam permeation tube 42 is different, and then can adjust methane gas mixture's humidity to make methane gas mixture can correspond different dew point temperature.
Preferably, the temperature regulation device comprises a heating module and a cooling module. In this embodiment, the temperature adjusting device has both a heating module and a cooling module, so that the temperature of the water in the water tank 41 of the humidity generating assembly 4 can be rapidly adjusted from high to low, and also can be rapidly adjusted from low to high, thereby greatly improving the flexibility of the methane humidity generator. Moreover, the temperature adjusting device can quickly respond to the temperature requirement, and can accurately control the temperature of the water in the water tank 41 at a set temperature by reasonably using the heating module and the refrigerating module, so that the temperature of the water in the water tank 41 is kept in a constant temperature state, and the stability and the accuracy of each parameter of the humidified methane mixed gas sent by the methane humidity generator are improved.
In an alternative real-time manner, in the methane humidity generator provided in the above embodiment, the moisture permeable pipe 42 of the humidity generating assembly 4 may be a polypropylene permeable pipe, and the polypropylene material has stable properties and stable water permeability, so that a small amount of water permeates into the polypropylene permeable pipe from the outside of the pipe wall of the polypropylene permeable pipe and flows through the methane mixed gas in the polypropylene permeable pipe in the form of water vapor, thereby increasing the humidity of the methane mixed gas.
Alternatively, when the water vapor permeable tube 42 is a polypropylene permeable tube, the following condition is satisfied:
the hardness is 78D-82D;
the wall thickness is 0.45mm-0.55mm;
the inner diameter is 2.45mm-2.55mm;
the length is 14.8m-15.6m.
In one embodiment, the polypropylene permeate tube satisfies:
the hardness is 80D;
the outer diameter is 3mm;
the inner diameter is 2.5mm;
the length is 15.2m.
Preferably, in order to reduce the volume of the water tank 41 in the humidity generating module 4 and thus enable the thermostat to regulate the water in the water tank 41 as quickly as possible, as shown in fig. 1, the middle portion of the vapor permeation tube 42 is wound in a roll-like structure.
With continued reference to fig. 1, on the basis of the above embodiments, in order to sufficiently mix the gas in the methane storage 1 and the mixed gas storage 2 before entering the humidity generating assembly 4, in one embodiment, the pipeline system 3 includes a mixing pipeline 34, a first branch pipeline 32 and a second branch pipeline 33, wherein one end of the mixing pipeline 34 forms a first gas outlet; one end of the first branch line 32 forms a first air inlet and the other end communicates with the mixing line 34, and one end of the second branch line 34 forms a second air inlet and the other end communicates with the mixing line 34.
Further, in one embodiment, the flow control assembly 31 includes: a first flow control valve 311 provided in the first branch line 32, and a second flow control valve 312 provided in the second branch line 33. The first flow control valve 311 and the second flow control valve 312 are separately arranged on the corresponding pipelines, and the adjustment of the two valves is more convenient.
In one embodiment, please refer to fig. 1, in order to facilitate the control of the outlet pressure of the methane storage 1 and the outlet pressure of the mixing gas storage 2, a pressure reducing valve 11 is disposed at the outlet of the methane storage 1, and a pressure reducing valve 21 is disposed at the outlet of the mixing gas storage 2.
Referring to fig. 1, in the use process of the methane humidity generator, in order to facilitate the control of the flow rate of the methane mixed gas entering the dew point instrument, the methane humidity generator further includes an adjusting pipeline 7, wherein an air inlet of the natural gas moisture meter 5 to be calibrated is communicated with an air outlet of the humidity generating assembly 4 for humidifying methane, an air inlet of the standard natural gas moisture meter 6 serving as a standard is communicated with an air outlet of the natural gas moisture meter 5 to be calibrated, one end of the adjusting pipeline 7 is communicated with an air outlet of the natural gas moisture meter 5 to be calibrated, and the adjusting pipeline 7 is provided with a flow rate adjusting assembly 71. The flow of the methane mixed gas in the regulating pipeline 7 is regulated by the flow regulating assembly 71, so that the flow of the methane mixed gas which is left in the methane mixed gas flowing out of the gas outlet of the natural gas moisture meter 5 to be calibrated and needs to flow into the standard natural gas moisture meter 6 can be further regulated.
Based on the same inventive concept, the embodiment of the invention also provides a method for calibrating the natural gas moisture meter by adopting any one of the methane humidity generators provided in the above technical schemes, after the methane storage, the mixed gas storage, the humidity generation assembly, the moisture meter to be calibrated and the standard are started, methane mixed gas with various methane contents can be obtained by adjusting the flow control assembly, and humidified methane mixed gas with various dew point requirements can be obtained by adjusting the humidity generation assembly; calibrating the natural gas moisture meter to be calibrated according to various combinations of various methane contents and various dew points of the methane mixed gas; for the convenience of describing the method for calibrating the natural gas moisture meter, the TDLAS natural gas moisture meter is taken as the natural gas moisture meter to be calibrated, and the cold mirror dew point instrument is taken as the standard natural gas moisture meter.
In the above method, the method for calibrating the TDLAS natural gas moisture meter according to each set of combinations of methane content and dew point temperature comprises:
after the dew point value of the humidified methane mixed gas is stable, acquiring a plurality of dew point value sets, wherein each dew point value set comprises a dew point value of a cold mirror dew point instrument and a dew point value of a TDLAS natural gas moisture instrument, and the interval between two adjacent acquiring operations is set;
and calculating the indication error of the TDLAS natural gas moisture meter according to the obtained standard value and the obtained measured value so as to calibrate the TDLAS natural gas moisture meter.
In an embodiment, during the experiment, the list of the various devices in the methane humidity generator may be:
the methane storage 1 is a methane steel cylinder and contains high-purity methane with the purity higher than 99.99 percent; the mixing gas storage 2 is a nitrogen cylinder containing high-purity nitrogen with the purity higher than 99.995%; the flow control assembly 31 in the piping system 3 has a first flow control valve 311 and a second flow control valve 312 which are two CS200 type gas flow meters, respectively, to adjust the flow rates of methane and nitrogen, respectively; in the humidity generation assembly 4, the liquid in the water tank 41 is deionized water, and a constant temperature water bath is used to adjust the temperature of the water in the water tank 41, the water vapor permeation tube 42 is a polypropylene permeation tube with the hardness of 80D, the outer diameter of 3mm, the inner diameter of 2.5mm and the length of 50 feet (about 15 meters); the natural gas moisture meter to be calibrated is a TDLAS natural gas moisture meter; the standard natural gas moisture meter is a precision cold mirror dew point meter.
The specific implementation process of this embodiment is as follows:
step S101: and starting the computer.
Opening a pressure reducing valve 11 on the methane storage device 1, and adjusting the pressure to be about 0.2MPa; opening a pressure reducing valve 21 on the mixing gas storage 2 to adjust the pressure to be about 0.1MPa; opening the first flow control valve 311 and the second flow control valve 312; turning on the power supply of the humidity generating component 4; opening a TDLAS natural gas moisture meter; opening a precision cold mirror dew point instrument; the flow regulating component 71 on the regulating pipeline 7 is regulated to make the air inlet flow of the precision cold mirror dew point instrument in the range of (0.7-0.8) L/min.
Step S102: the water temperature and the gas flow rates of methane and nitrogen in the water tank 41 of the humidity generating module 4 are set, and the humidity is waited for to stabilize.
The temperature of the water in the water tank 41 is adjusted with reference to table 1 according to the target dew point. For example, if it is necessary to emit moisture having a dew point of-50 deg.C, the temperature of the water in the water tank 41 is set to 28.0 deg.C. After the water temperature was set, the flow rates of methane and nitrogen were adjusted according to table 2 based on the target methane content. After the water temperature reaches a set value and waits for a period of time, the dew point of the moisture is stable. The waiting time is related to the target dew point, the lower the target dew point, the longer the waiting time. For example, a target dew point of-63.0 ℃ results in a wait time of about 4 hours; the target dew point was-26 ℃ and the waiting time was about 2 hours.
TABLE 1 corresponding relationship between water temperature and dew point of moisture in water tank
TABLE 2 relationship between flow rates of methane and nitrogen and methane content in the mixed gas
Step S103: and (6) calibrating.
Respectively recording dew point values of a TDLAS natural gas moisture meter and a precision cold mirror dew point meter after the mixed gas dew point is stable; the recording was performed 1 time every 2min and 6 times continuously. The dew point measurement was taken as the average of 6 measurements. And calculating the indicating value error by taking the measuring result of the precision cold mirror dew point instrument as a standard value and the result of the TDLAS natural gas moisture meter as a measuring value.
ΔT＝T TDLAS -T 0 (2.1)
In formula 2.1:
delta T is the dew point indication error of a TDLAS natural gas moisture meter, and is DEG C;
T 0 the dew point measurement result of a precision dew point instrument is measured in DEG C;
T TDLAS is the dew point measurement result of a TDLAS natural gas moisture meter, DEG C.
Step S104: and adjusting the water temperature or the gas flow, and carrying out next calibration.
After the calibration experiment is completed under the conditions of the target dew point value and the methane content, the temperature of the humidity generation component 4 is adjusted as required to enable the dew point to reach the next target dew point value; and adjusting the flow rates of the methane and the nitrogen to enable the methane content in the methane mixed liquid gas to reach the next target value. And after the dew point value of the moisture is stabilized, referring to the previous step, and performing calibration again.
Further, in the above adjusting process:
under the condition that the water temperature of the humidity generation assembly 4 is unchanged and the flow rates of methane and nitrogen are changed, the dew point value can be stabilized only within (20-30) min.
And under the second working condition, the flow of methane and nitrogen is not changed, the water temperature of the constant-temperature water tank is only changed, and the dew point value needs to be stable for a long time.
Step S105: and repeating the process until the calibration process is finished.
And repeating the process according to the target dew point value and the methane content of the calibration experiment until the calibration experiment is completely finished.
In conclusion, the methane humidity generator provided by the invention has the advantages that the flow of the generated wet gas is within the range of (0.8-1.2) L/min, the methane content is arbitrarily adjustable within the range of (80% -100%), the dew point is within the range of (-65 to-25) DEG C under 1 atmosphere, the corresponding moisture is within the range of (5.3-620) ppmv, and the calibration requirement of a common measurement range of a TDLAS natural gas moisture meter can be met. The humidity generator has low cost and simple operation.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a methane humidity generator, its characterized in that includes methane storage ware, mixes with gas storage ware, humidity generation subassembly and pipe-line system, wherein:
the pipeline system comprises a first air inlet, a second air inlet, a first air outlet and a flow control assembly, the first air inlet is communicated with the air outlet of the methane storage device, and the second air inlet is communicated with the air outlet of the mixed gas storage device; the flow control assembly is arranged on the pipeline system and is used for enabling the outlet gas flow of the methane storage device and the mixing gas storage device to be independently controllable;
the humidity generation assembly is adjustable in humidity of the methane mixed gas, the humidity generation assembly is provided with a mixed gas inlet and a humidifying methane gas outlet, the mixed gas inlet is communicated with the first gas outlet, and the humidifying methane gas outlet is used for discharging the methane mixed gas after humidification.
2. The methane humidity generator of claim 1, wherein the humidity generating assembly comprises a water tank, a temperature regulating device, and a water vapor permeation tube, the temperature regulating device being configured to regulate a temperature of water in the water tank; the material of steam permeation tube has the water permeability, and runs through the water tank, the one end of steam permeation tube forms the gas mixture import, the other end forms humidification methane gas outlet.
Preferably, the temperature adjustment device comprises a heating module and a cooling module.
Preferably, the water vapor permeation tube is a polypropylene permeation tube.
3. The methane humidity generator according to claim 1 or 2, wherein the water vapor permeable pipe satisfies the following condition:
the hardness is 78D-82D;
the wall thickness is 0.45mm-0.55mm;
the inner diameter is 2.45mm-2.55mm;
the length is 14.8m-15.6m.
4. The methane humidity generator of claim 1 or 2, wherein the water vapor permeable tube is coiled in a coiled configuration at a central portion thereof.
5. The methane humidity generator according to any of claims 1-4, wherein the piping system comprises a mixing pipe, a first branch pipe, and a second branch pipe, wherein one end of the mixing pipe forms the first gas outlet; one end of the first branch pipeline forms the first air inlet, the other end of the first branch pipeline is communicated with the mixing pipeline, and one end of the second branch pipeline forms the second air inlet, the other end of the second branch pipeline is communicated with the mixing pipeline.
Preferably, the flow control assembly comprises: the first flow control valve is arranged on the first branch pipeline, and the second flow control valve is arranged on the second branch pipeline.
6. The methane moisture generator of any of claims 1-4, wherein the outlet of the methane storage reservoir is provided with a pressure relief valve and the outlet of the mixing gas storage reservoir is provided with a pressure relief valve.
7. The methane humidity generator according to any one of claims 1 to 4, further comprising an adjusting pipeline, wherein an air inlet of the moisture meter to be calibrated is communicated with the humidified methane outlet, an air inlet of the standard moisture meter as the standard is communicated with an air outlet of the moisture meter to be calibrated, one end of the adjusting pipeline is communicated with the air outlet of the moisture meter to be calibrated, and a flow adjusting assembly is arranged on the adjusting pipeline.
8. A method for calibrating a natural gas moisture meter, which adopts the methane humidity generator as claimed in any one of claims 1 to 7, is characterized in that methane mixed gas with a plurality of methane contents is obtained by adjusting the flow control component, and humidified methane mixed gas with a plurality of dew point temperature requirements is obtained by adjusting the humidity generating component; calibrating the natural gas moisture meter according to various combinations of various methane contents and various dew point temperatures of the methane mixed gas; the method for calibrating the natural gas moisture meter according to the combination of each set of methane content and dew point temperature comprises the following steps:
after the dew point value of the humidified methane mixed gas is stable, acquiring a plurality of dew point value sets, wherein each dew point value set comprises a dew point value of a standard natural gas moisture meter and a dew point value of a natural gas standard moisture meter to be calibrated, and the interval between two adjacent acquiring operations is set;
and according to the acquired dew point value group data, taking the average value of the dew point values of the standard natural gas moisture meter acquired for multiple times as a standard value, taking the average value of the dew point values of the natural gas moisture meter to be calibrated acquired for multiple times as a measured value, and calculating the indication value error of the natural gas moisture meter to be calibrated according to the acquired standard value and the measured value so as to calibrate the natural gas moisture meter to be calibrated.
9. The method of claim 8, wherein when the piping system includes a mixing pipe, a first branch pipe and a second branch pipe, and the flow control assembly includes a first flow control valve provided in the first branch pipe and a second flow control valve provided in the second branch pipe, obtaining the methane mixed gas having a plurality of methane contents by adjusting the flow control assembly includes:
and controlling the gas outlet speeds of the methane storage and the mixing gas storage through the first flow valve and the second flow valve to obtain the methane mixed gas with various methane contents.
10. The method of claim 8, wherein when the humidity generating assembly comprises a water tank, a temperature regulating device, and a water vapor permeation tube, the adjusting the humidity generating assembly to obtain the plurality of types of humidified methane mixed gas with dew point temperature requirements comprises:
through temperature regulation apparatus adjusts the temperature of water in the water tank, adjusts the speed that vapor infiltration water vapor permeation tube, adjusts methane gas mixture's humidity to obtain the methane gas mixture after the humidification of multiple dew point requirement.
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