CN114593370A - Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system - Google Patents
Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system Download PDFInfo
- Publication number
- CN114593370A CN114593370A CN202011406571.7A CN202011406571A CN114593370A CN 114593370 A CN114593370 A CN 114593370A CN 202011406571 A CN202011406571 A CN 202011406571A CN 114593370 A CN114593370 A CN 114593370A
- Authority
- CN
- China
- Prior art keywords
- solvent
- outlet
- natural gas
- flash tank
- absorption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002904 solvent Substances 0.000 title claims abstract description 141
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000003345 natural gas Substances 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000005452 bending Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 21
- 238000007599 discharging Methods 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 12
- 230000008020 evaporation Effects 0.000 claims description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920006302 stretch film Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/105—Removal of contaminants of nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/541—Absorption of impurities during preparation or upgrading of a fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a natural gas denitrification solvent absorption pipeline failure early warning method, which comprises the following steps: measuring the sound wave voltage of each tensile detection film, and calculating sound wave energy through computer equipment; secondly, judging whether the point position corresponding to the stretching detection film has an over-stretching condition, and if so, performing early warning through computer equipment; if not, executing the third step; thirdly, judging the states of two sides of a valve on the same pipeline where the stretching detection film without over-stretching exists, and if the stretching detection film without over-stretching exists, carrying out early warning through computer equipment; and if the excessive bending state does not occur, returning to the first step.
Description
Technical Field
The invention relates to the technical field of automatic early warning of computers, in particular to an early warning method and a corresponding system for failure of a natural gas denitrification solvent absorption pipeline.
Background
As high-quality fuel and important chemical raw materials, natural gas is increasingly paid more attention to people in application, and the trend of accelerating the development of the natural gas industry is the world trend. However, natural gas produced in many oil and gas fields often contains a large amount of nitrogen, and natural gas with high nitrogen content has low calorific value and large energy consumption in the gathering and transportation process, and cannot be directly used as fuel. Therefore, denitrification of natural gas is an important condition for making full use of natural gas. The natural gas denitrification processes currently used in industry include: cryogenic cooling, solvent absorption, pressure swing adsorption and selective adsorption. The solvent absorption method has mild denitrification operation conditions, does not need to remove carbon dioxide, and has large operation flexibility and good application prospect because most of equipment and pipelines are made of carbon steel.
In the prior denitrification process of natural gas by a solvent absorption method, a raw material gas firstly flows through a propane refrigeration system to be cooled and then enters the lower part of a solvent absorption tower. The raw material gas is diffused from bottom to top in the solvent absorption tower and is subjected to gas-liquid mass transfer with the absorption solvent descending from the top of the tower, so that hydrocarbon components mainly comprising methane are selectively absorbed and enter a liquid phase. When the raw gas leaves the top of the tower, the raw gas becomes a nitrogen stream with little hydrocarbon content. And the solvent discharged from the bottom of the absorption tower is subjected to four-stage flash evaporation to gradually reduce the pressure of the hydrocarbon-rich solvent. And (3) carrying out compression, heat exchange and propane refrigeration on flash steam discharged from the four-stage flash tank, separating out a small amount of entrained solvent, and then sending the flash steam out of a battery limit as a product. And discharging the regenerated solvent from the fourth-stage flash tank, boosting the pressure, cooling and returning to the top of the absorption tower for recycling.
In view of the above prior art, there are the following disadvantages: because the solvent absorption process is designed into a multi-stage flash evaporation process, the pressure in the pipeline equipment is continuously reduced for many times, namely, the phenomenon of pressure mutation in the pipeline occurs for many times. Therefore, the stress distribution inside the pipe is not uniform, and defects in the pipe material are likely to occur. If the failure of the pipeline material cannot be warned in time, great potential safety hazard exists.
In view of the above, it is desirable to provide a computer automatic early warning method for pipeline failure of a natural gas denitrification solvent absorption device, which can early warn the pipeline failure of the natural gas denitrification solvent absorption device through real-time monitoring data, thereby improving the safety of the system.
Disclosure of Invention
The technical problem to be solved by the invention is that the pressure in the pipeline equipment is continuously reduced for a plurality of times due to the multi-stage flash evaporation process designed by the solvent absorption process, namely, the phenomenon of pressure mutation in the pipeline for a plurality of times occurs. Therefore, the stress distribution inside the pipe is not uniform, and defects in the pipe material are likely to occur. If the failure of the pipeline material cannot be warned in time, great potential safety hazard exists.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a computer automatic early warning method for pipeline failure of natural gas denitrification solvent absorption equipment comprises the following steps:
measuring the sound wave voltage of each tensile detection film, and calculating sound wave energy through computer equipment;
secondly, judging whether the position of the point corresponding to the stretching detection film has an over-stretching condition or not, and if so, carrying out early warning through computer equipment; if not, executing the third step;
thirdly, judging the states of two sides of a valve on the same pipeline where the over-stretched stretching detection film is positioned, and if the over-bent state occurs, performing early warning through computer equipment; and if the excessive bending state does not occur, returning to the first step.
Specifically, the first step includes disposing an acoustic detection system on the stretched detection film.
Specifically, the same pipe means a pipe between the first vapor outlet and the absorption column, a pipe between the first solvent outlet and the second solvent inlet, a pipe between the second vapor outlet and the third vapor outlet, a pipe between the second solvent outlet and the third solvent inlet, a pipe between the third vapor outlet and the fourth vapor outlet, a pipe between the third solvent outlet and the fourth solvent inlet, and a pipe between the fourth vapor outlet and the product gas outlet, and the valves V1 to V7 do not constitute a factor for dividing the pipes.
Specifically, the stretch detection film is disposed on an outer surface of the pipe.
Specifically, the state of both sides of the valve is measured by strain gauges installed on both sides of the valve.
Specifically, strain measurement is performed by a multi-channel dynamic resistance strain gauge.
The natural gas denitrification solvent absorption system applied according to the computer automatic early warning method for pipeline failure of the natural gas denitrification solvent absorption equipment comprises a four-level flash tank.
Specifically, the first-stage flash tank comprises a tank body, a first solvent inlet, a first solvent outlet and a first vapor outlet, wherein the first solvent inlet is used for flowing in the hydrocarbon-rich solvent discharged from the absorption tower, the first solvent outlet is used for discharging the solvent subjected to the first flash treatment out of the first flash tank, the first vapor outlet is used for discharging the gasified gas separated after flash evaporation out of the first flash tank, and the first vapor outlet is connected to the solvent absorption tower to reflux the vapor to the solvent absorption tower for re-absorption.
Specifically, the three-stage flash tank comprises a tank body, a third solvent inlet, a third solvent outlet and a third vapor outlet, wherein the third solvent inlet of the three-stage flash tank is connected to the first solvent outlet of the first-stage flash tank through a pipeline, the third solvent outlet of the three-stage flash tank further discharges the solvent to a lower-stage flash tank, and the third vapor outlet is used for discharging the gasified gas separated after the flash evaporation out of the third flash tank.
Specifically, the four-stage flash tank comprises a tank body, a fourth solvent inlet, a fourth solvent outlet and a fourth steam outlet, wherein the fourth solvent inlet of the four-stage flash tank is connected to the first solvent outlet of the first-stage flash tank through a pipeline, the solvent is processed by the fourth solvent outlet of the four-stage flash tank and then circulated back to the solvent absorption tower, so that the solvent is reused, and the fourth steam outlet is used for discharging gasified gas separated after flash evaporation out of the fourth flash tank.
The computer automatic early warning method for the pipeline failure of the natural gas denitrification solvent absorption equipment can early warn the pipeline failure of the natural gas denitrification solvent absorption equipment through real-time monitoring data, so that the safety of the system is improved.
Drawings
FIG. 1 is a flow chart of a computer-controlled method for a solvent absorption denitrification process of natural gas according to the present invention.
FIG. 2 is a structural diagram of the computer-controlled method supporting equipment for the solvent absorption denitrification process of natural gas provided by the invention.
Fig. 3 is a sound wave detection system matched with the computer control method of the natural gas solvent absorption denitrification process provided by the invention.
Detailed Description
A computer controlled method for a natural gas solvent absorption denitrification process of the present invention is described in further detail below.
The present invention will now be described in more detail with reference to the accompanying drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art may modify the invention herein described while still achieving the beneficial results of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific details must be set forth in order to achieve the developer's specific goals.
Before introducing the computer automatic early warning method for pipeline failure of the natural gas denitrification solvent absorption equipment provided by the application, in order to better explain the technical scheme of the invention, firstly, the computer automatic early warning equipment on which the computer automatic early warning method for pipeline failure of the natural gas denitrification solvent absorption equipment is based is introduced.
This equipment includes four-stage flash system and the sensing system of natural gas denitrification solvent absorption equipment, and above-mentioned four-stage flash system includes:
the first-stage flash tank includes a tank, a first solvent inlet, a first solvent outlet, and a first vapor outlet. The first solvent inlet is used for flowing into the hydrocarbon-rich solvent discharged from the absorption tower, the first solvent outlet is used for discharging the solvent subjected to the first flash treatment out of the first flash tank, the first steam outlet is used for discharging the gasified gas separated after flash evaporation out of the first flash tank, and the first steam outlet is connected to the solvent absorption tower to reflux the steam to the solvent absorption tower for re-absorption.
The secondary flash tank includes a tank and a second solvent inlet, a second solvent outlet, and a second vapor outlet. Wherein the second solvent inlet of the secondary flash tank is connected to the first solvent outlet of the primary flash tank by a pipe, and the second solvent outlet of the secondary flash tank discharges the solvent further to the next-stage flash tank. The second vapor outlet is used for discharging the vaporized gas separated after the flash evaporation out of the second flash tank.
The three-stage flash tank includes a tank body and a third solvent inlet, a third solvent outlet, and a third vapor outlet. Wherein the third solvent inlet of the third-stage flash tank is connected to the first solvent outlet of the first-stage flash tank by a pipe, and the third solvent outlet of the third-stage flash tank discharges the solvent further to the lower-stage flash tank. The third vapor outlet is used for discharging the vaporized gas separated after the flash evaporation out of the third flash tank.
The four-stage flash tank includes a tank and a fourth solvent inlet, a fourth solvent outlet, and a fourth vapor outlet. And the fourth solvent outlet of the four-stage flash tank is used for circulating the processed solvent back to the solvent absorption tower, so that the solvent can be repeatedly used. The fourth vapor outlet is for discharging the vaporized gas separated after flashing out of the fourth flash tank.
And after the second steam outlet, the third steam outlet and the fourth steam outlet are converged, the steam is output to a product gas output line.
Valves V1, V2, V3, V4, V5, V6 and V7 are respectively arranged on a pipeline between the first vapor outlet and the absorption tower, a pipeline between the first solvent outlet and the second solvent inlet, a pipeline between the second vapor outlet and the third vapor outlet, a pipeline between the second solvent outlet and the third solvent inlet, a pipeline between the third vapor outlet and the fourth vapor outlet, a pipeline between the third solvent outlet and the fourth solvent inlet and a pipeline between the fourth vapor outlet and the product gas output port. The valves V1-V7 are closed to separate the sections from each other in different pressure states, and the gas flow after the valves V1-V7 are opened causes the pipes around the valves to be stressed.
Strain gauges S11, S12, S21, S22, S31, S32, S41, S42, S51, S52, S61, S62, S71 and S72 are mounted on the inner surfaces of the upstream and downstream pipelines of the valves V1-V7, and particularly, the distance between the central positions of the upstream and downstream pipelines of the valves V1-V7 where the strain gauges are mounted and the valves V1-V7 is less than 15cm, so that the pipeline conditions on two sides of the valves V1-V7 can be better reflected. The strain gauge can measure by adopting a multi-channel distributed dynamic resistance strain gauge.
Stretch sensing films F11, F12, F21, F22, F23, F31, F32, F33, F41, F42 are disposed on the outer surfaces of the tubes at the vapor outlet and solvent outlet of the first flash tank, the vapor outlet, solvent inlet and outlet of the second flash tank, the vapor outlet of the third flash tank, the vapor outlet of the solvent inlet and outlet of the fourth flash tank, and the end of the solvent inlet (i.e., at a position near the respective flash tanks). The tensile detection film can be alpha-alumina, the thickness is 200-500 microns, the measurement sensitivity is reduced when the thickness is too thick, noise data is easily generated when the thickness is too thin, and the tensile detection film can be formed in a spraying mode. Alpha-alumina can partially microcrack when the pipe is subjected to strains above a predetermined value due to its low elasticity.
The placement of tensile test films F11, F12, F21, F22, F23, F31, F32, F33, F41, F42 on the outer surface of each pipe provides an acoustic detection system, as shown in fig. 3. FIG. 3 is a cross-sectional view of the acoustic detection system along the direction of elongation of the pipe. In the extending direction of the pipeline, one end of the tensile detection film is provided with the sound wave receiver 1, the other end is provided with the sound wave receiver 2, and the sound wave source is arranged at the position which is far from the sound wave receiver 1 by the distance X1 and is far from the sound wave receiver 2 by the distance X2, so that the sound wave can be transmitted to the sound wave receivers on two sides.
The multichannel distributed dynamic resistance strain gauge and the acoustic wave detection system are connected to a computer and can transmit data in real time, and the connection mode is wired or wireless.
The computer automatic early warning method for pipeline failure of the natural gas denitrification solvent absorption equipment comprises the following steps:
first, the sound wave voltage of the stretch detection films F11, F12, F21, F22, F23, F31, F32, F33, F41, and F42 was measured, and the sound wave energy was calculated.
The acoustic wave receiver 1 and the acoustic wave receiver 2 receive the voltage signal by transmitting the acoustic wave to a specific position of the above acoustic wave stretch film, and the acoustic wave energy of the two acoustic wave receivers is calculated by formula (1).
Wherein E is the current sound wave energy, wherein E1 represents the sound wave energy received by the sound wave receiver 1, E2 represents the sound wave energy received by the sound wave receiver 2, U (t) represents the sound wave voltage directly received by the sound wave receiver, w is a constant, and is taken to be 1 x 1021。
And a second step of judging whether the stretching detection films F11, F12, F21, F22, F23, F31, F32, F33, F41 and F42 are excessively stretched or not at the corresponding point positions.
The value of E1/E2 was calculated and the value of E1/E2 was compared to the square of | X1-X2|/(X1+ X2) to determine stretch.
Specifically, when the deviation value between the value of E1/E2 and the square of | X1-X2|/(X1+ X2) exceeds a specific threshold, which may be 10% -15% of the square of | X1-X2|/(X1+ X2), it is determined that the point where the stretch detection film is located is over-stretched, and a warning is prompted on a computer.
When the deviation between the value of E1/E2 and the square of | X1-X2|/(X1+ X2) does not exceed a specific threshold value, it is determined that the film is not excessively stretched at the point where the stretch detection film is located, and the third step is performed.
And thirdly, judging the states of two sides of the valve on the same pipeline where the stretching detection film without over-stretching exists.
Specifically, the same piping as above means a piping between the first vapor outlet and the absorption column, a piping between the first solvent outlet and the second solvent inlet, a piping between the second vapor outlet and the third vapor outlet, a piping between the second solvent outlet and the third solvent inlet, a piping between the third vapor outlet and the fourth vapor outlet, a piping between the third solvent outlet and the fourth solvent inlet, and a piping between the fourth vapor outlet and the product gas outlet, and the valves V1 to V7 do not constitute a factor for dividing the piping.
And analyzing strain values of the strain gauges on two sides of the valve on the same pipeline through a channel distributed dynamic resistance strain gauge, and calculating a bending coefficient V. And judging whether the pipeline is excessively bent or not through a formula (2). In particular, the method comprises the following steps of,
wherein k is a constant value 1.1547 epsilontStrain value, epsilon, measured for channel distributed dynamic resistance strain gaugesmaxThe strain value of the material at the critical point of the bending fracture, namely the maximum sustainable strain value, t is the thickness of the pipeline, r is the diameter of the pipeline, and l is the distance from the center of the strain gauge to the center of the valve. The bending coefficients of the two strain gauges on two sides of the same valve are V1 and V2 respectively.
First, it is determined whether the values of V1 and V2 exceed a first threshold value, preferably, the first threshold value is 0.698. If the threshold value is exceeded, the situation that excessive bending occurs near the valve is judged, and early warning is carried out.
If the value does not exceed the threshold, further judging whether V1/V2 exceeds a second threshold, preferably, the second threshold is 1.874, and if V1/V2 exceeds the second threshold, judging that an excessive bending situation occurs near the valve, and giving an early warning. If the V1/V2 does not exceed the second threshold value, the situation that the valve is not excessively bent nearby is judged, and the first step is returned to continue monitoring.
According to the computer automatic early warning method for the pipeline failure of the natural gas denitrification solvent absorption equipment, provided by the invention, the pipeline failure of the natural gas denitrification solvent absorption equipment can be early warned through real-time monitoring data by strain and sound wave detection of key parts of the pipeline and computer automatic data analysis, so that the safety of a system is improved.
In order to simplify the system and highlight the invention point in the description, some known necessary communication or pipeline pressure control components, such as network connectors and pumps, valves, etc., are omitted in describing the equipment system, but the arrangement positions and the arrangement modes of the above necessary components can be determined by those skilled in the art according to the technical knowledge grasped by those skilled in the art to implement the invention, and thus, the description is omitted.
In order to make the objects and features of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are intended to use non-precision ratios for the purpose of facilitating and clearly facilitating the description of the embodiments of the invention.
The foregoing shows and describes the general principles, essential features and advantages of the invention, which is, therefore, described only as an example of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but rather that the invention includes various equivalent changes and modifications without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A natural gas denitrification solvent absorption pipeline failure early warning method is characterized by comprising the following steps: the method comprises the following steps:
measuring the sound wave voltage of each tensile detection film, and calculating sound wave energy through computer equipment;
secondly, judging whether the position of the point corresponding to the stretching detection film has an over-stretching condition or not, and if so, carrying out early warning through computer equipment; if not, executing the third step;
thirdly, judging the states of two sides of a valve on the same pipeline where the stretching detection film without over-stretching exists, and if the stretching detection film without over-stretching exists, carrying out early warning through computer equipment; and if the excessive bending state does not occur, returning to the first step.
2. The method for warning the failure of the absorption pipeline of the denitrification solvent for natural gas according to claim 1, wherein the method comprises the following steps: the first step involves placing an acoustic detection system on the stretched detection film.
3. The method for warning the failure of the absorption pipeline of the denitrification solvent for natural gas according to claim 1, wherein the method comprises the following steps: the same conduit means a conduit between the first vapor outlet and the absorption column, a conduit between the first solvent outlet and the second solvent inlet, a conduit between the second vapor outlet and the third vapor outlet, a conduit between the second solvent outlet and the third solvent inlet, a conduit between the third vapor outlet and the fourth vapor outlet, a conduit between the third solvent outlet and the fourth solvent inlet, a conduit between the fourth vapor outlet and the product gas outlet, and the valves V1-V7 do not constitute a factor for dividing the conduits.
4. The method for warning the failure of the absorption pipeline of the denitrification solvent for natural gas according to claim 1, wherein the method comprises the following steps: the stretching detection film is arranged on the outer surface of the pipeline.
5. The method for warning the failure of the absorption pipeline of the denitrification solvent for natural gas according to claim 1, wherein the method comprises the following steps: the state of both sides of the valve is measured by strain gauges mounted on both sides of the valve.
6. The method for warning the failure of the absorption pipeline of the denitrification solvent for natural gas according to claim 1, wherein the method comprises the following steps: and carrying out strain measurement by a multi-channel dynamic resistance strain measuring instrument.
7. The natural gas denitrification solvent absorption system used in the early warning method for failure of the natural gas denitrification solvent absorption pipeline according to one of claims 1 to 6, wherein: the apparatus comprises a four-stage flash tank.
8. The absorption system for denitrogenation solvent of natural gas according to claim 7, wherein: the first-stage flash tank comprises a tank body, a first solvent inlet, a first solvent outlet and a first steam outlet, wherein the first solvent inlet is used for flowing in a hydrocarbon-rich solvent discharged by the absorption tower, the first solvent outlet is used for discharging the solvent subjected to the first flash treatment out of the first flash tank, the first steam outlet is used for discharging gasified gas separated after flash evaporation out of the first flash tank, and the first steam outlet is connected to the solvent absorption tower to reflux steam to the solvent absorption tower for re-absorption.
9. The absorption system for denitrogenation solvent of natural gas according to claim 7, wherein: the third solvent inlet of the third-stage flash tank is connected to the first solvent outlet of the first-stage flash tank through a pipeline, the third solvent outlet of the third-stage flash tank further discharges the solvent to a next-stage flash tank, and the third vapor outlet is used for discharging gasified gas separated after flash evaporation out of the third flash tank.
10. The natural gas denitrification solvent absorption system according to claim 7, wherein: the four-stage flash tank comprises a tank body, a fourth solvent inlet, a fourth solvent outlet and a fourth steam outlet, wherein the fourth solvent inlet of the four-stage flash tank is connected to the first solvent outlet of the first-stage flash tank through a pipeline, the fourth solvent outlet of the four-stage flash tank is used for circulating the solvent back to the solvent absorption tower after the solvent is processed, so that the solvent can be reused, and the fourth steam outlet is used for discharging gasified gas separated after flash evaporation out of the fourth flash tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406571.7A CN114593370A (en) | 2020-12-04 | 2020-12-04 | Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406571.7A CN114593370A (en) | 2020-12-04 | 2020-12-04 | Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114593370A true CN114593370A (en) | 2022-06-07 |
Family
ID=81802728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011406571.7A Pending CN114593370A (en) | 2020-12-04 | 2020-12-04 | Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114593370A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02262030A (en) * | 1989-03-14 | 1990-10-24 | Sps Technol Inc | Ultrasonic load display member, apparatus and method |
| CN1060526A (en) * | 1990-08-27 | 1992-04-22 | 伊安·E·基布尔怀特 | Ultrasonic load indicating member with sensor |
| KR20040004103A (en) * | 2002-07-01 | 2004-01-13 | 마츠시타 덴끼 산교 가부시키가이샤 | Gas protective device and gas protective method |
| JP2009092644A (en) * | 2007-09-21 | 2009-04-30 | National Institute Of Advanced Industrial & Technology | Method and system for detecting defect of structure |
| US20110067497A1 (en) * | 2009-09-18 | 2011-03-24 | Conocophillips Company | High precision ultrasonic corrosion rate monitoring |
| WO2012004508A1 (en) * | 2010-07-08 | 2012-01-12 | IFP Energies Nouvelles | Method for testing the integrity of a flexible tubular pipe and device for implementing same |
| US20130233081A1 (en) * | 2010-11-15 | 2013-09-12 | The University Of Cincinnati | Embedded or clip-on device for health monitoring of an article |
| CN104236505A (en) * | 2014-09-18 | 2014-12-24 | 中国航天标准化研究所 | Pipeline corrosion monitoring device based on array type piezoelectric film sensor |
| CN204314001U (en) * | 2014-11-28 | 2015-05-06 | 武汉工程大学 | Pipe flange stress monitoring system under Moments effect |
| WO2015064807A1 (en) * | 2013-10-29 | 2015-05-07 | (주)유민에쓰티 | Leak detection device and remote monitoring system using same |
| CN106016617A (en) * | 2016-06-02 | 2016-10-12 | 珠海格力电器股份有限公司 | Air conditioner pipeline detection method and system |
| CN108088609A (en) * | 2017-12-18 | 2018-05-29 | 北京卫星制造厂 | A kind of tubular type pressure sensor and processing method |
| CN110093197A (en) * | 2019-05-23 | 2019-08-06 | 中国石油化工股份有限公司 | A kind of denitrogenation method and denitrification system for associated gas |
| CN210065692U (en) * | 2019-05-23 | 2020-02-14 | 中国石油化工股份有限公司 | A denitrogenation system for oil field associated gas |
| CN111271610A (en) * | 2020-04-08 | 2020-06-12 | 陕西理工大学 | Liquid pipeline leakage detection early warning device and method |
-
2020
- 2020-12-04 CN CN202011406571.7A patent/CN114593370A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02262030A (en) * | 1989-03-14 | 1990-10-24 | Sps Technol Inc | Ultrasonic load display member, apparatus and method |
| CN1060526A (en) * | 1990-08-27 | 1992-04-22 | 伊安·E·基布尔怀特 | Ultrasonic load indicating member with sensor |
| KR20040004103A (en) * | 2002-07-01 | 2004-01-13 | 마츠시타 덴끼 산교 가부시키가이샤 | Gas protective device and gas protective method |
| JP2009092644A (en) * | 2007-09-21 | 2009-04-30 | National Institute Of Advanced Industrial & Technology | Method and system for detecting defect of structure |
| US20110067497A1 (en) * | 2009-09-18 | 2011-03-24 | Conocophillips Company | High precision ultrasonic corrosion rate monitoring |
| WO2012004508A1 (en) * | 2010-07-08 | 2012-01-12 | IFP Energies Nouvelles | Method for testing the integrity of a flexible tubular pipe and device for implementing same |
| US20130233081A1 (en) * | 2010-11-15 | 2013-09-12 | The University Of Cincinnati | Embedded or clip-on device for health monitoring of an article |
| WO2015064807A1 (en) * | 2013-10-29 | 2015-05-07 | (주)유민에쓰티 | Leak detection device and remote monitoring system using same |
| CN104236505A (en) * | 2014-09-18 | 2014-12-24 | 中国航天标准化研究所 | Pipeline corrosion monitoring device based on array type piezoelectric film sensor |
| CN204314001U (en) * | 2014-11-28 | 2015-05-06 | 武汉工程大学 | Pipe flange stress monitoring system under Moments effect |
| CN106016617A (en) * | 2016-06-02 | 2016-10-12 | 珠海格力电器股份有限公司 | Air conditioner pipeline detection method and system |
| CN108088609A (en) * | 2017-12-18 | 2018-05-29 | 北京卫星制造厂 | A kind of tubular type pressure sensor and processing method |
| CN110093197A (en) * | 2019-05-23 | 2019-08-06 | 中国石油化工股份有限公司 | A kind of denitrogenation method and denitrification system for associated gas |
| CN210065692U (en) * | 2019-05-23 | 2020-02-14 | 中国石油化工股份有限公司 | A denitrogenation system for oil field associated gas |
| CN111271610A (en) * | 2020-04-08 | 2020-06-12 | 陕西理工大学 | Liquid pipeline leakage detection early warning device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105953987A (en) | Valve inner leakage testing simulating device and gas valve inner leakage rate acoustic emission diagnosis method thereof | |
| CN114593370A (en) | Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system | |
| CN109840548A (en) | One kind being based on BP neural network Diagnosis Method of Transformer Faults | |
| Benjamin et al. | Burst tests on pipeline containing closely spaced corrosion defects | |
| SA517381199B1 (en) | Integrated Analyzer for Process Monitoring During Processing and Upgrading of Natural Gas | |
| Wu et al. | Study on the similarity of wet gas pressure drop in long-throat Venturi | |
| Bulejko et al. | Temperature-dependent burst failure of polymeric hollow fibers used in heat exchangers | |
| CN102052996B (en) | Simple leakage detection instrument for liquid container and using method thereof | |
| Cao et al. | Experimental investigation on long hydrodynamic slugs in offshore pipeline | |
| Makarenko et al. | Investigation of the mechanical properties of pipes for long-term cooling systems | |
| Mohammaddoost et al. | Investigation of methane and ethane diffusivity in the glass reinforced epoxy composite: Experimental and simulation | |
| CN207866437U (en) | A kind of pipe fitting device for detecting sealability | |
| Telis‐Romero et al. | Friction losses in valves and fittings for viscoplastic fluids | |
| Mohamed | Phase redistribution and separation of gas-liquid flows in an equal-sided impacting tee junction with a horizontal inlet and inclined outlets | |
| US20230194162A1 (en) | Dynamic leak detection system in propane heat exchangers | |
| CN110639332B (en) | High-purity nitrogen or argon purification equipment | |
| CN211328778U (en) | Molecular sieve purifier regenerating unit for preventing carbon dioxide from penetrating | |
| Santos et al. | Real-time monitoring of gas pipeline through artificial neural networks | |
| Chen et al. | Analysis of Fluid‐Structure Coupling Vibration Characteristics of Pipeline Transporting Bubbly Fluid Medium: With Application to Luxury Passenger Ship Life Area Pipeline | |
| Shayegani Akmal et al. | Failure analysis of an 8-inch urban gas distribution steel pipeline | |
| Kane et al. | Wet H {sub 2} S cracking of carbon steels and weldments | |
| CN117517580A (en) | Carbon molecular sieve performance testing device and testing method | |
| CN214288273U (en) | Simple anhydrous and oxygen-free experimental device | |
| Chen et al. | Ultimate External Pressure Capacity of Deepsea Dented Pipeline with Combined Axial Compressive Force | |
| CN113218785B (en) | Method and system for predicting tensile property of polymer based on stamping test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |