CN-116838953-B - Natural gas pipeline mixed hydrogen time division multiplexing measurement control method
Abstract
The invention discloses a natural gas pipeline hydrogen mixing time division multiplexing measurement control method, which comprises the following steps of pipeline arrangement; the method comprises the steps of testing and installing, signal modulation, natural gas and hydrogen transportation, concentration detection and modeling regulation, wherein a transparent glass pipeline is arranged to provide a penetrable laser detection environment, a TDLAS sensor which is longitudinally arranged is used for collecting detection data, the detection accuracy of concentration data is prevented from being influenced by single detection position, in the hydrogen separation process, the TDLAS sensor is used for detecting gas concentration data in the transparent glass pipeline in real time, a longitudinal distribution curve related to the concentration of the natural gas is established, a visualized concentration data model is provided for a monitoring platform, the convenience of measurement control is improved, and meanwhile, the position of a high-low level splitter plate is regulated and controlled according to the gas concentration data to separate the natural gas from the hydrogen, so that the practicability of the control method is improved. The method can be used for conveying two different gases independently or simultaneously so as to reduce the transportation cost of the hydrogen.
Inventors
- LV ZHIYONG
- TIAN JIAN
- CUI YALI
- Shen Yongcen
- PENG YONGZHOU
- MEI JINLONG
- RAO FENGCHANG
- DENG JIBIN
- LIU ZHAOPING
Assignees
- 广东省内河港航产业研究有限公司
- 广东韶关港有限公司
Dates
- Publication Date
- 20260505
- Application Date
- 20230523
Claims (7)
- 1. A method for controlling the time division multiplexing measurement of mixed hydrogen of a natural gas pipeline comprises the following steps of firstly arranging pipelines, secondly testing and installing, thirdly modulating signals, fourthly conveying natural gas and hydrogen, fifthly detecting concentration, sixthly modeling and regulating, and is characterized in that: in the first step, a transparent glass pipeline is arranged at the receiving end of the natural gas pipeline, a high-low-level flow dividing plate is arranged at the outlet of the transparent glass pipeline, a hydrogen storage alloy throwing mechanism is arranged at the top of the transparent glass pipeline, and a blowing pipeline connected with a blower is arranged at the bottom of the transparent glass pipeline; In the second step, a mounting bracket is longitudinally arranged along the direction of the transparent glass pipeline, and a TDLAS sensor is fixedly mounted on the mounting bracket, wherein a laser emission port of the TDLAS sensor is mutually perpendicular to the outer wall of the transparent glass pipeline; in the third step, a TDLAS sensor is used for emitting a basic light beam before the device is put into use, harmonic extraction is carried out according to the result, and then signals emitted by the TDLAS sensor are modulated according to the information extracted by the harmonic; in the fourth step, mixing the hydrogen and the natural gas at a transmission source of the natural gas, obtaining the mixed hydrogen natural gas after mixing, and then conveying the mixed hydrogen natural gas by using a natural gas pipeline; in the fifth step, after the hydrogen-mixed natural gas enters the transparent glass pipeline, concentration detection analysis is performed through a TDLAS sensor longitudinally arranged on one side of the transparent glass pipeline; In the sixth step, the throwing amount of the hydrogen storage alloy is determined according to the concentration detection and analysis result, then the hydrogen storage alloy is thrown through a hydrogen storage alloy throwing mechanism arranged at the top of the transparent glass pipeline, meanwhile, the hydrogen storage alloy is suspended in the transparent glass pipeline by wind power provided by a blower arranged at the bottom of the transparent glass pipeline for separation treatment, a TDLAS sensor detects gas concentration data in the transparent glass pipeline in real time during separation treatment, a longitudinal distribution curve about the concentration of natural gas is established, then the gas concentration data of the transparent glass pipeline is sent to a monitoring platform, and meanwhile, the natural gas and hydrogen are separated and transmitted to a transportation terminal according to the position of a high-low level splitter plate regulated and controlled by the gas concentration data.
- 2. The method for measuring and controlling mixed hydrogen time division multiplexing of a natural gas pipeline according to claim 1, wherein in the first step, the diameter specification of the receiving end of the natural gas pipeline is 2600mm, the natural gas pipeline is made of L245, the receiving ends of the transparent glass pipeline and the natural gas pipeline are connected in a matched mode through flanges, the transparent glass pipeline is longitudinally arranged, and the height of the transparent glass pipeline is 8000-10000 mm.
- 3. The method for measuring and controlling the mixed hydrogen time division multiplexing of the natural gas pipeline according to claim 1, wherein in the second step, the arrangement distance of the mounting brackets is 50-80 mm, and the distance between the TDLAS sensor and the outer wall of the transparent glass pipeline after the TDLAS sensor is mounted is 10-15 mm.
- 4. The method for measuring and controlling the mixed hydrogen time division multiplexing of the natural gas pipeline according to claim 1, wherein in the third step, the harmonic wave extraction process is that harmonic wave signals on high-frequency components are transferred to direct-current components through a multiplication phase discriminator and low-pass filtering, then Fourier cosine series expansion is carried out on exponential terms in the signals, then a two-phase lock-in amplifier is adopted to analyze quadrature mixed signals, then sine wave signals with the same frequency are regulated, high-frequency information is filtered out of the original signals through a low-pass filter, and feedback amplitude information of the signals is obtained after filtering.
- 5. The method for controlling mixed hydrogen time division multiplexing measurement of a natural gas pipeline according to claim 1, wherein in the fourth step, the addition amount of hydrogen in the mixed hydrogen treatment is 5% -8% of the volume of natural gas, and the hydrogen pressure in the mixed hydrogen natural gas is 1.25-1.85 MPa.
- 6. The method for measuring and controlling the mixed hydrogen time division multiplexing of the natural gas pipeline according to claim 1, wherein in the fifth step, the concentration detection and analysis process is that a TDLAS sensor emits light beams firstly, the light beams enter a transparent glass pipeline, the light intensity is attenuated under the action of the mixed hydrogen natural gas, then the attenuated light waves are received through a receiving part, the absorbance of a spectrum is calculated according to the lambert beer law, and then the natural gas content and the hydrogen content in the transparent glass pipeline are calculated respectively according to the value of the absorbance, so that the concentration detection and analysis process is completed.
- 7. The method for controlling mixed hydrogen time division multiplexing measurement of natural gas pipelines according to claim 1, wherein in the step six, the temperature in a transparent glass pipeline in the separation treatment process is 300-350 ℃, and the treatment rate of the separation treatment is 200-280 m 3 /h.
Description
Natural gas pipeline mixed hydrogen time division multiplexing measurement control method Technical Field The invention relates to the technical field of hydrogen mixing natural gas separation control, in particular to a time division multiplexing measurement control method for natural gas pipeline hydrogen mixing. Background The mixed natural gas is mixed gas of hydrogen and natural gas, the mixed gas can be transported through an original natural gas pipeline and then is independently used after being separated, so that the transportation cost of the hydrogen is reduced, the natural gas and the hydrogen are required to be mutually separated through separation regulation and control in the time division multiplexing process of the mixed natural gas, but the existing measurement control method only has single detection position in the pipeline, the detection accuracy of concentration data is affected, the height position of a splitter plate cannot be adjusted in the separation process, the practicability of the control method is affected, and meanwhile, a visual concentration data model cannot be provided for a monitoring platform after the hydrogen is separated, so that the convenience of measurement control is affected. Disclosure of Invention The invention aims to provide a natural gas pipeline hydrogen mixing time division multiplexing measurement control method for solving the problems in the background technology. The invention provides a method for controlling the time division multiplexing measurement of mixed hydrogen of a natural gas pipeline, which comprises the following steps of first step of pipeline arrangement, second step of test installation, third step of signal modulation, fourth step of natural gas and hydrogen transportation, fifth step of concentration detection, sixth step of modeling regulation; In the first step, a transparent glass pipeline is arranged at the receiving end of the natural gas pipeline, high-low-level flow dividing plates are respectively arranged at the outlet of the transparent glass pipeline, a hydrogen storage alloy throwing mechanism is arranged at the top of the transparent glass pipeline, and a blowing pipeline connected with a blower is arranged at the bottom of the transparent glass pipeline; In the second step, a mounting bracket is longitudinally arranged along the direction of the transparent glass pipeline, and a TDLAS sensor is fixedly mounted on the mounting bracket, wherein a laser emission port of the TDLAS sensor is mutually perpendicular to the outer wall of the transparent glass pipeline; in the third step, a TDLAS sensor is used for emitting a basic light beam before the device is put into use, harmonic extraction is carried out according to the result, and then signals emitted by the TDLAS sensor are modulated according to the information extracted by the harmonic; in the fourth step, mixing the hydrogen and the natural gas at a transmission source of the natural gas, obtaining the mixed hydrogen natural gas after mixing, and then conveying the mixed hydrogen natural gas by using a natural gas pipeline; in the fifth step, after the hydrogen-mixed natural gas enters the transparent glass pipeline, concentration detection analysis is performed through a TDLAS sensor longitudinally arranged on one side of the transparent glass pipeline; In the sixth step, the throwing amount of the hydrogen storage alloy is determined according to the concentration detection and analysis result, then the hydrogen storage alloy is thrown through a hydrogen storage alloy throwing mechanism arranged at the top of the transparent glass pipeline, meanwhile, the hydrogen storage alloy is suspended in the transparent glass pipeline by wind power provided by a blower arranged at the bottom of the transparent glass pipeline for separation treatment, a TDLAS sensor detects gas concentration data in the transparent glass pipeline in real time during separation treatment, a longitudinal distribution curve about the concentration of natural gas is established, the transparent glass pipeline is sent to a monitoring platform, and meanwhile, the natural gas and hydrogen are separated and transmitted to a transportation terminal according to the position of a high-low level splitter plate regulated and controlled by the gas concentration data. Preferably, in the first step, the diameter specification of the receiving end of the natural gas pipeline is 2600mm, the natural gas pipeline is made of L245, the receiving ends of the transparent glass pipeline and the natural gas pipeline are connected in a matched mode through flanges, the transparent glass pipeline is longitudinally arranged, and the height of the transparent glass pipeline is 8000-10000 mm. Preferably, in the second step, the arrangement distance of the mounting brackets is 50-80 mm, and the distance between the TDLAS sensor and the outer wall of the transparent glass pipeline after being mounted is 10-15 mm. Preferabl