CN114593370B - Early warning method and corresponding system for failure of natural gas denitrification solvent absorption pipeline - Google Patents
Early warning method and corresponding system for failure of natural gas denitrification solvent absorption pipeline Download PDFInfo
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- CN114593370B CN114593370B CN202011406571.7A CN202011406571A CN114593370B CN 114593370 B CN114593370 B CN 114593370B CN 202011406571 A CN202011406571 A CN 202011406571A CN 114593370 B CN114593370 B CN 114593370B
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- 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
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- 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
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- 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
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- 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
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- 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
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Abstract
The invention discloses a method for early warning the failure of a natural gas denitrification solvent absorption pipeline, which comprises the following steps: measuring the sound wave voltage of each stretching detection film, and calculating the sound wave energy through computer equipment; secondly, judging whether the point position corresponding to the stretching detection film has an overstretching condition or not, and if so, carrying out early warning through computer equipment; if not, executing a third step; thirdly, judging the states of the two sides of the valve on the same pipeline where the stretching detection film without overstretching is located, and if the overstretching state occurs, carrying out early warning through computer equipment; if the excessive bending state does not occur, the first step is returned.
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
Natural gas is used as a high-quality fuel and an important chemical raw material, and the application of the natural gas is getting more and more attention, so that the development of the natural gas industry is accelerated and the trend of the current world is realized. However, natural gas produced in many oil and gas fields often contains a large amount of nitrogen, the heat productivity of the natural gas with high nitrogen content is low, the energy consumption in the gathering and transportation process is high, and the natural gas cannot be directly used as fuel. Therefore, natural gas denitrification is an important condition for fully utilizing natural gas. The natural gas denitrification processes currently applied to industry include: cryogenic, solvent absorption, pressure swing adsorption and selective adsorption. The solvent absorption method has mild denitrification operation conditions, does not need to remove carbon dioxide, has large operation elasticity because most of equipment and pipelines are made of carbon steel, and has good application prospect.
In the existing denitrification process of natural gas by a solvent absorption method, firstly, a raw material gas flow is cooled by a propane refrigeration system and then enters the lower part of a solvent absorption tower. The raw material gas diffuses from bottom to top in the solvent absorption tower and carries out gas-liquid mass transfer with the absorption solvent descending from the tower top, so that hydrocarbon components mainly comprising methane are selectively absorbed and enter a liquid phase. When the feed gas leaves the top of the column, it becomes a nitrogen stream with very little hydrocarbon content. The solvent discharged from the bottom of the absorption tower adopts a four-stage flash evaporation mode to gradually reduce the pressure of the hydrocarbon-rich solvent. The flash gas discharged from the four-stage flash tank is subjected to compression, heat exchange and propane refrigeration, and a small amount of entrained solvent is separated out and then is sent out as a product to a boundary zone. And discharging the regenerated solvent from the fourth-stage flash tank, boosting and cooling, and returning to the top of the absorption tower for recycling.
Against 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 pipeline equipment is continuously reduced for a plurality of times, namely a phenomenon of a plurality of times of pressure abrupt changes occurs in the pipeline. Therefore, the internal stress distribution of the pipe is uneven, and defects of the pipe material are liable to occur. If the failure of the pipeline material cannot be timely early-warned, a great potential safety hazard exists.
In summary, 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 by monitoring data in real time, so as to improve the safety of the system.
Disclosure of Invention
The technical problem to be solved by the invention is that the multi-stage flash evaporation process is designed in the solvent absorption process, so that the pressure in pipeline equipment is continuously reduced for a plurality of times, namely the phenomenon of a plurality of times of pressure mutation occurs in the pipeline. Therefore, the internal stress distribution of the pipe is uneven, and defects of the pipe material are liable to occur. If the failure of the pipeline material cannot be timely early-warned, a great potential safety hazard exists.
The technical scheme adopted 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 stretching detection film, and calculating the sound wave energy through computer equipment;
Secondly, judging whether the point position corresponding to the stretching detection film has an overstretching condition or not, and if so, carrying out early warning through computer equipment; if not, executing a third step;
Thirdly, judging the states of two sides of the valve on the same pipeline where the overstretched stretching detection film is located, and if the overstretched state occurs, carrying out early warning through computer equipment; if the excessive bending state does not occur, the first step is returned.
Specifically, the first step includes providing an acoustic wave detection system on the stretch-sensing 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, a pipe between the fourth vapor outlet and the product gas outlet, and the valves V1 to V7 do not constitute factors for dividing the pipes.
Specifically, the tensile test film is disposed on the 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.
According to the natural gas denitrification solvent absorption system applied to the computer automatic early warning method for the pipeline failure of the natural gas denitrification solvent absorption equipment, the equipment comprises a four-stage 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 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 vapor outlet is used for discharging the gasified gas separated after the flash treatment 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 third-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 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 is used for further discharging solvent to a lower-stage flash tank, and the third vapor outlet is used for discharging gasified gas separated after flash evaporation out of the third flash tank.
Specifically, the fourth-stage flash tank comprises a tank body, a fourth solvent inlet, a fourth solvent outlet and a fourth vapor outlet, wherein the fourth solvent inlet of the fourth-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 fourth-stage flash tank circulates the solvent back to the solvent absorption tower after being treated, so that the solvent is repeatedly used, and the fourth vapor outlet is used for discharging gasified gas separated after flash evaporation out of the fourth flash tank.
According to the computer automatic early warning method for the pipeline failure of the natural gas denitrification solvent absorption equipment, the pipeline failure of the natural gas denitrification solvent absorption equipment can be early warned by monitoring data in real time, so that the safety of a system is improved.
Drawings
FIG. 1 is a flow chart of a computer controlled process for a natural gas solvent absorption denitrification process provided by the present invention.
FIG. 2 is a block diagram of a computer controlled process kit for a natural gas solvent absorption denitrification process according to the present invention.
FIG. 3 shows an acoustic detection system matched with a computer control method of a natural gas solvent absorption denitrification process provided by the invention.
Detailed Description
A computer controlled process for a natural gas solvent absorption denitrification process according to the present invention will be described in further detail below.
The present invention will be described in more detail below with reference to the attached drawings, in which preferred embodiments of the present invention are shown, it being understood that one skilled in the art can modify the present invention described herein while still achieving the beneficial effects of the present invention. Accordingly, the following description is to be construed as broadly known 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 be appreciated that in the development of any such actual embodiment, numerous implementation details must be made in order to achieve the developer's specific goals.
Before introducing the computer automatic early warning method for the pipeline failure of the natural gas denitrification solvent absorption equipment, in order to better explain the technical scheme of the application, the computer automatic early warning equipment based on the computer automatic early warning method for the pipeline failure of the natural gas denitrification solvent absorption equipment is introduced.
The device comprises a four-stage flash evaporation system and a sensing system of a natural gas denitrification solvent absorption device, wherein the four-stage flash evaporation system comprises:
The first-stage flash tank comprises a tank body, 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 vapor outlet is used for discharging the gasified gas separated after the flash evaporation out of the first flash tank, and the first vapor outlet is connected to the solvent absorption tower for refluxing the vapor to the solvent absorption tower for re-absorption.
The second-stage flash tank comprises a tank body, 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 lower flash vessel. The second vapor outlet is for discharging vaporized gas separated after flash vaporization out of the second flash tank.
The third-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 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 vessel. The third vapor outlet is for discharging vaporized gas separated after flash vaporization out of the third flash tank.
The fourth-stage flash tank comprises a tank body, a fourth solvent inlet, a fourth solvent outlet and a fourth vapor outlet. 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, and the fourth solvent outlet of the four-stage flash tank circulates the solvent back to the solvent absorption tower after being treated, so that the solvent is repeatedly used. The fourth vapor outlet is for discharging vaporized gas separated after flash vaporization out of the fourth flash tank.
And after the second vapor outlet, the third vapor outlet and the fourth vapor outlet are converged, outputting the vapor to a product gas output line.
The pipeline between the first vapor outlet and the absorption tower, the pipeline between the first solvent outlet and the second solvent inlet, the pipeline between the second vapor outlet and the third vapor outlet, the pipeline between the second solvent outlet and the third solvent inlet, the pipeline between the third vapor outlet and the fourth vapor outlet, the pipeline between the third solvent outlet and the fourth solvent inlet, and the pipeline between the fourth vapor outlet and the product gas outlet are respectively provided with valves V1, V2, V3, V4, V5, V6 and V7. The closing of the valves V1-V7 separates the portions of the valve that are at different pressure conditions, and the flow of gas after opening of the valves V1-V7 causes the conduit adjacent the valves to be stressed.
Strain gauges S11, S12, S21, S22, S31, S32, S41, S42, S51, S52, S61, S62, S71, S72 are installed on the inner surfaces of the upstream and downstream pipes of the valves V1-V7, and specifically, the center positions of the upstream and downstream pipes of the valves V1-V7, where the strain gauges are installed, are less than 15cm from the valves V1-V7, so that the pipe conditions on both sides of the valves V1-V7 can be better reflected. The strain gauge can be measured by using a multi-channel distributed dynamic resistance strain gauge.
Stretch-detecting films F11, F12, F21, F22, F23, F31, F32, F33, F41, F42 are provided on the outer surfaces of the tubes at the vapor outlet and the solvent outlet of the first flash tank, the vapor outlet and the solvent inlet of the second flash tank, the vapor outlet and the solvent inlet of the third flash tank, the vapor outlet and the solvent inlet of the fourth flash tank, the ends of the solvent inlets (i.e., at positions near the respective flash tanks). The tensile test film may be formed of alpha-alumina having a thickness of 200 to 500 μm, and has reduced measurement sensitivity due to excessive thickness, and is easily noisy due to excessive thickness, and may be formed by spraying. Alpha-alumina produces some microcracking due to its lower elasticity when the pipe is subjected to strains exceeding a predetermined value.
A tensile test film F11, F12, F21, F22, F23, F31, F32, F33, F41, F42 is provided on the outer surface of each pipe, and an acoustic wave test system is provided as shown in fig. 3. Fig. 3 is a cross-sectional view of the acoustic wave detection system along the direction of pipe extension. In the direction along the pipe extension, one end of the tensile detection film is provided with an acoustic wave receiver 1, the other end is provided with an acoustic wave receiver 2, and an acoustic wave source is provided at a position distant from the acoustic wave receiver 1 by a distance X1 and distant from the acoustic wave receiver 2 by a distance X2, so that the acoustic wave can propagate onto the acoustic wave receivers on both 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 connection.
The automatic computer early warning method for the pipeline failure of the natural gas denitrification solvent absorption equipment comprises the following steps:
first, the acoustic wave voltages of the stretch detecting films F11, F12, F21, F22, F23, F31, F32, F33, F41, F42 are measured, and the acoustic wave energies are calculated.
By transmitting sound waves to the specific position of the sound wave stretched film, the sound wave receiver 1 and the sound wave receiver 2 receive the voltage signal, and the sound wave energy of the two sound wave receivers is calculated by the formula (1).
Wherein E is current sound wave energy, E1 represents sound wave energy received by the sound wave receiver 1, E2 represents sound wave energy received by the sound wave receiver 2, U (t) represents sound wave voltage directly received by the sound wave receiver, w is a constant, and the constant is taken to be 1 x 10 21.
And a second step of judging whether the points corresponding to the stretching detection films F11, F12, F21, F22, F23, F31, F32, F33, F41 and F42 are over stretched.
The value of E1/E2 is calculated and the value of E1/E2 is compared to the square of |X1-X2|/(X1+X2) to determine stretch.
Specifically, when the deviation value of the square of the value of E1/E2 and |x1-x2|/(x1+x2) exceeds a specific threshold, the specific threshold may be 10% -15% of the square of |x1-x2|/(x1+x2), it is determined that the overstretching condition exists at the point where the stretch detection film is located, and early warning is prompted on a computer.
When the deviation value of the square of the value of E1/E2 and |X1-X2|/(X1+X2) does not exceed a specific threshold value, it is determined that the overstretch condition does not occur at the point where the stretch-detecting 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 overstretching is positioned.
Specifically, the same pipe mentioned above refers to 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, a pipe between the fourth vapor outlet and the product gas outlet, and the valves V1 to V7 do not constitute factors for dividing the pipe.
And analyzing the strain values of the strain gauges at the two sides of the valve on the same pipeline through a channel distributed dynamic resistance strain gauge, and calculating the bending coefficient V. And judging whether the pipeline is excessively bent or not through a formula (2). In particular, the method comprises the steps of,
Wherein k is a constant value 1.1547, epsilon t is a strain value measured by a channel distributed dynamic resistance strain gauge, epsilon max is a strain value of a material at a critical point of bending fracture, namely a maximum bearable strain value, t is the thickness of a pipeline, r is the diameter of the pipeline, and l is the distance from the center of a strain gauge to the center of a valve. The bending coefficients of the two strain gauges aiming at the two sides of the same valve are V1 and V2 respectively.
It is first determined whether the values of V1 and V2 exceed a first threshold value, preferably 0.698. If the threshold value is exceeded, judging that the excessive bending condition appears near the valve, and carrying out early warning.
If the threshold value is not exceeded, further judging whether the V1/V2 exceeds a second threshold value, preferably, the second threshold value is 1.874, and if the V1/V2 exceeds the second threshold value, judging that the situation of excessive bending occurs near the valve, and carrying out early warning. If V1/V2 does not exceed the second threshold, judging that the valve is not excessively bent nearby, and returning to the first step 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 by monitoring data in real time through strain and acoustic 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 to highlight the invention points, part of well-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 location and manner of arrangement of the above-mentioned necessary components can be determined by a person skilled in the art according to the technical knowledge of the person skilled in the art to implement the invention, so that the description is omitted.
In order to make the objects and features of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the drawings are in a very simplified form and all employ non-precise ratios, and are merely convenient and clear to aid in the description of the embodiments of the invention.
The foregoing has outlined and described the basic principles, features, and advantages of the present invention in order that the description that follows is merely an example of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather that the foregoing embodiments and description illustrate only the principles of the invention, and that the invention is susceptible to various equivalent changes and modifications without departing from the spirit and scope of the invention, all of which are intended to be within the scope of the invention as hereinafter claimed. The scope of the invention is defined by the appended claims and their equivalents.
Claims (5)
1. A method for early warning the failure of a natural gas denitrification solvent absorption pipeline is characterized by comprising the following steps: the method comprises the following steps:
Measuring the sound wave voltage of each stretching detection film, and calculating the sound wave energy through computer equipment; the stretching detection film is arranged on the outer surface of the pipeline, and the sound wave detection system is arranged on the stretching detection film: a first sound wave receiver is arranged at one end of the stretching detection film along the extending direction of the pipeline, a second sound wave receiver is arranged at the other end of the stretching detection film, and a sound wave source is arranged at a position which is away from the first sound wave receiver by a distance X1 and away from the second sound wave receiver by a distance X2, so that sound waves can propagate to the sound wave receivers at two sides; by transmitting sound waves to a specific position of the sound wave stretching film, the first sound wave receiver and the second sound wave receiver receive voltage signals, and sound wave energy of the two sound wave receivers is calculated through formula (1):
（1）
Wherein E is current sound wave energy, E1 represents sound wave energy received by a first sound wave receiver, E2 represents sound wave energy received by a second sound wave receiver, U (t) represents sound wave voltage directly received by the sound wave receiver, w is a constant, and the constant is taken to be 1 x 10 21;
judging whether the point position corresponding to the stretching detection film has an overstretching condition or not, and if so, carrying out early warning through computer equipment; if not, executing a third step;
Calculating the value of E1/E2, and comparing the value of E1/E2 with the square of |X1-X2|/(X1 + X2) to determine the stretch; when the deviation value of the square of the value of E1/E2 and the value of I X1-X2I/(X1 + X2) exceeds a specific threshold value, judging that the overstretching condition exists at the point where the stretching detection film is positioned, and prompting and early warning on a computer; when the deviation value of the value of E1/E2 and the square of |x1-x2|/(x1+x2) does not exceed a specific threshold value, judging that the overstretching condition does not occur at the point where the stretching detection film is positioned, and executing a third step, wherein the threshold value is 10% -15% of the square of |x1-x2|/(x1+x2);
Thirdly, judging the states of the two sides of the valve on the same pipeline where the overstretched stretching detection film is located, and if the overstretched state occurs, carrying out early warning through computer equipment; if the excessive bending state does not occur, returning to the first step; 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, a pipe between the fourth vapor outlet and the product gas outlet, and the valves V1 to V7 do not constitute factors for dividing the pipes; the states of the two sides of the valve are measured through strain gauges arranged on the two sides of the valve; strain measurement is carried out through a multichannel dynamic resistance strain gauge;
Analyzing strain values of strain gauges at two sides of a valve on the same pipeline through a channel distributed dynamic resistance strain gauge, calculating a bending coefficient V, and judging whether the pipeline is excessively bent or not through a formula (2);
（2）
Wherein k is a constant value 1.1547, epsilon t is a strain value measured by a channel distributed dynamic resistance strain gauge, epsilon max is a strain value of a material at a critical point of bending fracture, namely a maximum bearable strain value, t is the thickness of a pipeline, r is the diameter of the pipeline, and l is the distance from the center of a strain gauge to the center of a valve; bending coefficients of the two strain gauges on two sides of the same valve are V1 and V2 respectively;
Firstly judging whether the values of V1 and V2 exceed a first threshold value which is 0.698, if so, judging that the situation of excessive bending occurs near the valve, and carrying out early warning;
If the threshold value is not exceeded, further judging whether the V1/V2 exceeds a second threshold value which is 1.874, and if the V1/V2 exceeds the second threshold value, judging that the situation of excessive bending occurs near the valve, and carrying out early warning; if V1/V2 does not exceed the second threshold, judging that the valve is not excessively bent nearby, and returning to the first step to continue monitoring.
2. The natural gas denitrification solvent absorption system for use in a method for early warning of failure of a natural gas denitrification solvent absorption pipeline according to claim 1, wherein: the apparatus includes a four stage flash tank.
3. The natural gas denitrification solvent absorption system according to claim 2, wherein: 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 into hydrocarbon-rich solvent discharged from the absorption tower, the first solvent outlet is used for discharging solvent subjected to first flash treatment out of the first flash tank, the first vapor outlet is used for discharging 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 vapor to the solvent absorption tower for re-absorption.
4. The natural gas denitrification solvent absorption system according to claim 2, wherein: the third-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 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 is used for further discharging solvent to a lower-stage flash tank, and the third vapor outlet is used for discharging gasified gas separated after flash evaporation out of the third flash tank.
5. The natural gas denitrification solvent absorption system according to claim 2, wherein: the fourth-stage flash tank comprises a tank body, a fourth solvent inlet, a fourth solvent outlet and a fourth vapor outlet, wherein the fourth solvent inlet of the fourth-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 fourth-stage flash tank circulates the solvent back to the solvent absorption tower after being treated, the solvent is repeatedly used, and the fourth vapor outlet is used for discharging gasified gas separated after flash evaporation out of the fourth flash tank.
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