CN117272692B - Method and system for evaluating sloshing adaptability of offshore natural gas treatment process - Google Patents
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Abstract
The invention discloses a method and a system for evaluating sloshing adaptability of an offshore natural gas treatment process, and relates to the technical field of offshore natural gas treatment processes, wherein the method comprises the following steps: establishing an experimental model and a numerical simulation model of the gas-liquid coexisting device to obtain a first outlet boundary condition and a second outlet boundary condition; establishing a dynamic numerical model of the process flow, adding shaking disturbance conditions, monitoring the operation conditions of important nodes and equipment, obtaining sea state boundary conditions of the influence of shaking on an experimental device, and giving out a corresponding optimization control strategy; and constructing a dynamic numerical model of the whole process operation, adding shaking disturbance conditions, monitoring the operation states of important nodes and equipment, and evaluating the adaptability of the whole process to disturbance to obtain sea state boundary conditions of the influence of shaking on the treatment process. The invention realizes comprehensive, objective and accurate evaluation of the sloshing adaptability of the offshore natural gas treatment process through microscopic and macroscopic analysis.
Description
Technical Field
The invention relates to the technical field of marine natural gas treatment processes, in particular to a method and a system for evaluating sloshing adaptability of an offshore natural gas treatment process.
Background
With the rapid development of economy, energy reserves are one of the key projects focused on all countries in the world, wherein natural gas is a key object of energy reserves. The exploitation of natural gas is not limited to land, the ocean is a resource treasury with great development potential, and the seabed contains rich natural gas resources. At present, the production of the marine natural gas is still in the primary stage, and the marine natural gas treatment process has very good development prospect. The natural gas offshore floating type production and oil storage device FPSO (Floating Production Storage and Offloading) is a device widely applied to the development of offshore oil and gas fields, has very comprehensive functions as a large offshore natural gas production base for offshore floating type natural gas processing, storage and export, and is favored by the oil and gas production industry of all countries around the world.
However, key equipment of an upper module of a marine natural gas dehydration process of a natural gas FPSO is affected by ocean sloshing disturbance, and safety risk accidents such as equipment failure and the like are easily caused under the influence. Therefore, the key equipment and the process of the partial module of the natural gas FPSO must have good sea condition adaptability, and the method has important significance for the sloshing adaptability evaluation of the offshore natural gas treatment process. At present, the research on the sloshing adaptability of the offshore natural gas treatment process is only the research on the dynamic disturbance of the process, and the research on the overall analysis and evaluation of the sloshing adaptability of the offshore natural gas treatment process is lacked.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method and a system for evaluating the sloshing adaptability of an offshore natural gas treatment process, wherein the method is used for evaluating the combination of equipment operation disturbance analysis and process dynamic disturbance analysis, the equipment operation disturbance analysis shows a relatively microscopic view angle, which is the analysis of the distribution state of fluid working media in the equipment, the speed field of a system pressure temperature field, the mass transfer effect and the like, and the process dynamic disturbance analysis shows a relatively macroscopic view angle, which is the analysis of the treatment efficiency, the safe operation and the economical efficiency (energy consumption, specific power consumption, energy loss and the like) of the process, and the comprehensive, objective and accurate evaluation of the sloshing adaptability of the offshore natural gas treatment process is realized through the combination analysis of the microscopic and macroscopic view.
In a first aspect, the present disclosure provides a method for evaluating sloshing suitability of an offshore natural gas treatment process.
A method for evaluating sloshing adaptability of an offshore natural gas treatment process comprises the following steps:
establishing an experimental model of gas-liquid coexisting equipment, carrying out shaking disturbance experiment on the experimental model by utilizing a shaking experimental platform, monitoring the running state of each equipment in the experimental model to obtain a first outlet boundary condition, and giving an improvement strategy for each equipment;
establishing a numerical simulation model of the gas-liquid coexisting equipment, performing numerical simulation based on an improvement strategy, and analyzing the influence of shaking disturbance on the equipment to obtain a second outlet boundary condition;
based on the first outlet boundary condition, a dynamic numerical model of the process flow is established, shaking disturbance conditions are added, the running conditions of important nodes and equipment are monitored, sea state boundary conditions of the shaking on the experimental device are obtained, and a corresponding optimization control strategy is given;
based on the second outlet boundary condition and the optimal control strategy, a dynamic numerical model of the whole process operation is constructed, shaking disturbance conditions are added, the operation states of important nodes and equipment are monitored, the adaptability of the whole process to disturbance is evaluated, and the sea state boundary condition of the influence of shaking on the treatment process is obtained.
In a second aspect, the present disclosure provides an offshore natural gas treatment process sloshing suitability evaluation system.
An offshore natural gas treatment process sloshing suitability evaluation system comprising:
the first outlet boundary condition acquisition module is used for establishing an experimental model of the gas-liquid coexisting equipment, carrying out shaking disturbance experiments on the experimental model by utilizing the shaking experimental platform, monitoring the running states of all the equipment in the experimental model, obtaining a first outlet boundary condition and giving an improvement strategy for all the equipment;
the second outlet boundary condition acquisition module is used for establishing a numerical simulation model of the gas-liquid coexisting equipment, performing numerical simulation based on an improvement strategy, and analyzing the influence of shaking disturbance on the equipment to obtain a second outlet boundary condition;
the equipment sloshing adaptability evaluation module is used for establishing a dynamic numerical model of a process flow based on the first outlet boundary condition, adding sloshing disturbance conditions, monitoring the running conditions of important nodes and equipment, obtaining the sea state boundary condition of the influence of the sloshing on the experimental device, and giving out a corresponding optimization control strategy;
and the sloshing adaptability evaluation module is used for constructing a dynamic numerical model of the whole process operation based on the second outlet boundary condition and the optimal control strategy, adding sloshing disturbance conditions, monitoring the operation states of important nodes and equipment, evaluating the adaptability of the whole process to disturbance, and obtaining the sea state boundary condition of the influence of the sloshing on the treatment process.
The one or more of the above technical solutions have the following beneficial effects:
the invention provides a method and a system for evaluating the sloshing adaptability of an offshore natural gas treatment process, wherein the method is characterized in that equipment operation disturbance analysis and process dynamic disturbance analysis are combined, the equipment operation disturbance analysis shows a relatively microscopic view angle, the analysis is performed on the distribution state of fluid working media in the equipment, the speed field of a system pressure temperature field, the mass transfer effect and the like, the process dynamic disturbance analysis shows a relatively macroscopic view angle, the analysis is performed on the treatment efficiency, the safe operation and the economical efficiency (energy consumption, specific power consumption, energy loss and the like) of the process, and the comprehensive, objective and accurate evaluation on the sloshing adaptability of the offshore natural gas treatment process is realized through microscopic and macroscopic combined analysis.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a method for evaluating sloshing adaptability of an offshore natural gas treatment process according to an embodiment of the present invention;
fig. 2 is a schematic overall flow chart of an evaluation method for sloshing adaptability of an offshore natural gas treatment process according to an embodiment of the invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Example 1
The embodiment provides a method for evaluating the sloshing adaptability of an offshore natural gas treatment process, which is divided into an experiment part and a simulation part, as shown in fig. 1, and specifically comprises the following steps:
step S1, an experimental model of gas-liquid coexisting equipment is established, a rocking disturbance experiment is carried out on the experimental model by utilizing a rocking experimental platform, the running state of each equipment in the experimental model is monitored, a first outlet boundary condition is obtained, and an improvement strategy for each equipment is provided;
s2, establishing a numerical simulation model of the gas-liquid coexisting device, performing numerical simulation based on an improvement strategy, and analyzing the influence of shaking disturbance on the device to obtain a second outlet boundary condition;
step S3, based on the first outlet boundary condition, a dynamic numerical model of the process flow is established, shaking disturbance conditions are added, the operation conditions of important nodes and equipment are monitored, sea state boundary conditions of the shaking effect on the experimental device are obtained, and a corresponding optimization control strategy is given;
and S4, constructing a dynamic numerical model of the whole process operation based on the second outlet boundary condition and the optimal control strategy, adding a shaking disturbance condition, monitoring the operation states of important nodes and equipment, and evaluating the adaptability of the whole process to disturbance to obtain the sea state boundary condition of the influence of shaking on the treatment process.
The method for evaluating sloshing adaptability of the offshore natural gas treatment process according to the present embodiment will be described in more detail below.
In the step S1, an experimental model of the gas-liquid coexistence apparatus is built, that is, a simulation model of the FPSO experimental device is built. In this embodiment, as shown in fig. 2, the gas-liquid coexisting device includes a heat exchanger, a separator, and a tower, and the three are most sensitive to shaking disturbance as a gas-liquid coexisting system, so that the gas-liquid coexisting device has the most representative and research values. The swaying and disturbance experiment and analysis are carried out on three experimental models, namely a heat exchanger, a separator and a tower by using a swaying experimental platform, namely, all equipment of the experimental model is arranged on a six-degree-of-freedom swaying platform, all the equipment are connected by using a hose, and the swaying experiment is carried out by using the swaying platform.
In the process of shaking disturbance experiments, various instruments, sensors and the like are utilized to monitor the logistics distribution, shell side bias flow and heat exchange coefficient of the heat exchanger in real time, and monitor the quality indexes (such as the water dew point of a gas phase outlet of a dehydration absorption tower, the content of acidic substances of a gas phase outlet of a deacidification absorption tower, the temperature of the outlet of the heat exchanger and other parameters) of a gas-liquid outlet of the separator and the tower and the gas-liquid fluctuation state. The logistics distribution is determined by measuring the flow of different channels according to the flow ratio; the shell side bias flow is obtained by measuring flow and temperature at the inlet and outlet of the heat exchanger; the heat exchange coefficient is obtained by calculation through a calculation formula of heat exchange quantity/heat exchange area; the quality index of the gas-liquid phase outlet is obtained by measuring a dew point instrument and a mass spectrometer; the gas-liquid fluctuation state is obtained by installing a sensor to monitor parameters such as pressure, flow, liquid level and the like in real time. By monitoring relevant state parameters of the heat exchanger, the tower and the classifier, different shaking forms are adopted, the response conditions of the heat exchanger, the tower and the classifier to disturbance are observed, the influence of shaking on the equipment is inspected from two angles of flow and mass transfer, and the outlet boundary condition is obtained.
Marine vessel has six degrees of freedom of the form of swaying, including: the pitch (the pitch of the wave (the pitch),xdirection), roll (walk,ydirection), heave (the heave,zdirection), belonging to a linear motion; the roll (roll,xdirection), pitch (pitch,xdirection > and yaw (yaw,xdirection), belonging to angular movement. And monitoring and observing the response conditions of the three devices to disturbance by adopting different shaking modes, and observing the influence of shaking on the devices from two angles of flow and mass transfer to obtain a first outlet boundary condition. Specifically, based on the change conditions of parameters such as the flow rate (component ratio, temperature and pressure) of the gas-liquid phase outlet of the tower, the heat exchanger and the separator under disturbance, a formula is generated based on fitting of a parameter change process, and the formula is the first outlet boundary condition.
In this embodiment, the flow rate calculation is described as an example. The bow is the shake of alpha angle along Z axis, the roll is the rotation of beta angle along Y axis, the pitch is the rotation of gamma angle along X axis, based on angle、/>、/>Setting the ship in any direction, and multiplying the three matrixes to obtain a rotation matrix formulaRThe method comprises the following steps:the method comprises the steps of carrying out a first treatment on the surface of the The angular acceleration function during shaking is: />；/>The method comprises the steps of carrying out a first treatment on the surface of the In the above-mentioned method, the step of,R 0 is the rocking angle, i.e., angular displacement, in rad;Tthe unit is s for the platform movement period;ttime is given in s;αis angular acceleration in rad/s 2 。
Further, the acceleration formula of the control body at any point on the platform is as follows:the method comprises the steps of carrying out a first treatment on the surface of the In the above-mentioned method, the step of,lfor controlling the body movement displacement, the unit is m; />For controlling the horizontal distance between the body and the coordinate axis, the unit is m;bfor controlling the vertical distance between the body and the coordinate axis, the unit is m;ttime is given in s;Tfor the translational movement period, the unit is s.
When the platform shakes, the modeling of the isolator in the equipment is simplified, and the motion equation is as follows:。
because the motion of the experimental platform is non-stationary and uniform, an inertia force term is added in the motion equation, and the formula becomes:。
an operation equation (or referred to as a motion model) of the experimental platform is constructed based on a balance equation, when the sloshing platform shakes, the flow of fluid is affected by external disturbance, and the logistics flow of the simulation model is calculated as follows:the method comprises the steps of carrying out a first treatment on the surface of the In the above formula, D is the diameter of a pipeline, and the unit is m;pis thatxAverage pressure at the section in Pa;vis thatxAverage velocity at the section in m/s;ρis the density of the fluid, and the unit is kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the A is the cross-sectional area through which fluid flows, in m 2 ；λIs Darcy hydraulic friction coefficient; g is gravity acceleration, and the unit is m/s 2 ；αThe unit is rad for the included angle between the fluid flowing direction and the horizontal axis;θthe unit is rad for the included angle between the inertia force and the fluid movement direction;xin order to control the horizontal distance of the body from the coordinate axis,zfor controlling the vertical distance of the body from the coordinate axis, the unit is m.
Based on the flow formula, the flow rate change condition of the gas-liquid phase outlet of the tower, the heat exchanger and the separator under disturbance is analyzed, and a formula is generated based on the fitting of a change process, wherein the formula is the boundary condition of the first outlet. Further, by analyzing the change conditions of parameters such as temperature, pressure, liquid level and the like of the equipment, a formula is generated based on fitting of a change process, and a first outlet boundary condition is obtained.
Meanwhile, according to the above-described sloshing disturbance experiment, improved strategies for the baffle structure of the separator, the tower, the heat exchanger inlet structure and the shell side bias suppression are given, such as: different baffle arrangement modes, baffle shapes, baffle materials and the like are arranged.
In the above step S2, a numerical simulation model of the gas-liquid coexisting apparatus is first established. Specifically, the gas-liquid coexisting device is subjected to numerical simulation, the classifier, the tower and the heat exchanger are respectively analyzed, the modeling of the liquefaction process and the shaking simulation are carried out through HYSYS software through heat exchange similarity, geometric similarity and motion similarity, and a numerical simulation model of the gas-liquid coexisting device is established, wherein the numerical simulation model characterizes the flow condition and the component migration condition of working media in the gas-liquid coexisting device. And (3) carrying out numerical simulation on the improvement strategy given in the step (S1), realizing the numerical simulation in a numerical simulation model, and verifying the numerical simulation model with the data monitored by the experiment.
In this embodiment, the description is given by taking the heat exchanger and the separator as examples, and the relevant parameter equation of the heat exchanger includes the following heat exchanger continuity equation, energy equation and separator energy equation. This practice isThe embodiment adopts the plate-fin heat exchanger, and the hot fluid in the plate-fin heat exchanger transfers heat to cold fluid through the partition plate, so that heat transfer between the fluids is realized. The temperature changes along the flowing direction of the medium, the transverse heat transfer of the fluid in the same channel is negligible, and the temperature, the pressure and the speed of the fluid on the same section are uniformly distributed due to the heat transfer characteristic of the fluid, so that the fluid has no internal circulation. The heat exchanger continuity equation is:the method comprises the steps of carrying out a first treatment on the surface of the The heat exchanger energy equation is: />The method comprises the steps of carrying out a first treatment on the surface of the The energy equation of the separator is:the method comprises the steps of carrying out a first treatment on the surface of the Wherein,ρis density in kg.m -3 ；uIs the speed, the unit is m.s -1 ；pPressure in Pa;Dthe hydraulic diameter is given by m;his specific enthalpy in J.kg -1 ；QThe unit is W, which is the heat exchange quantity;c p specific heat, unit is J.kg -1 ·℃ -1 ；AIs the cross-sectional area, the unit is m 2 The method comprises the steps of carrying out a first treatment on the surface of the Subscript ofh、c、WRepresenting hot fluid, cold fluid and separator, respectively; />、/>、/>Respectively representing the density of the hot fluid, the specific heat of the hot fluid and the cross-sectional area of the hot fluid;zexpressed as the vertical distance of the control body from the coordinate axis in units ofm；tTime is expressed in units ofs；TRepresenting the thermal fluid motion cycle in s.
The separator liquid phase mass conservation equation is:the method comprises the steps of carrying out a first treatment on the surface of the The separator gas phase mass conservation equation is: />The method comprises the steps of carrying out a first treatment on the surface of the The separator energy conservation equation is: />The method comprises the steps of carrying out a first treatment on the surface of the In the above, V L Liquid volume, in m;ρ L is the liquid density in kgm -3 ；M 1L LNG flow is fed to the storage tank in kg/s; m is M g The gas mass is in kg/s; m is M 2L The unit is kg/s for the liquid phase flow of the outlet of the separator; v (V) v The unit is m < DEG > of gas volume;ρ v is gas phase density in kgm -3 ；M 2v The unit is kg/s for the gas phase flow of the outlet of the separator;Vrepresenting the total volume;ρindicating total density->Representing the total enthalpy of the liquid phase; q is the heat transferred to the fluid by the heat leakage of the separator in the unit time, and the unit is kW; q (Q) g The heat flow from the gas-liquid interface to the fluid is kW; h is a 1L Enthalpy value of the inlet liquid in kJ/kg; h is a 2v The unit is kJ/kg for the enthalpy of the outlet gas phase; h is a 2L The unit is kJ/kg for the outlet liquid phase enthalpy.
In addition, the construction of the tower-related parametric equation is similar to that described above.
On the basis, according to the added shaking disturbance boundary conditions (namely shaking disturbance boundary conditions applied in the step S1), the influence of shaking disturbance on equipment is analyzed, the adaptation conditions of the distribution condition, the pressure field, the temperature field, the operation efficiency and the like of working media in gas-liquid coexisting equipment on shaking are explored, the disturbance conditions of some important parameters of an outlet such as the temperature, the flow and the pressure of an inlet of a tower, a separator and a heat exchanger are obtained, the adaptation capability of single equipment on shaking is analyzed from a microscopic angle, and then the second outlet boundary conditions are obtained. Specifically, based on the numerical simulation model, the change process of each parameter such as temperature, flow and pressure of the inlet of the tower and the heat exchanger obtained through calculation and analysis is fitted to generate a formula, and the formula is the boundary condition of the second outlet.
Further, in the software simulation, the flow change of the material flow is controlled by changing the opening of the throttle valve, and the change value of the opening of the throttle valve during corresponding flow change is calculated, and the change function of the corresponding material flow is as follows:the method comprises the steps of carrying out a first treatment on the surface of the In the above-mentioned method, the step of,Qis the flow of the material flow during shaking;q 0 is the flow rate of the material flow when the material flow is stationary;kfor maximum flow rate variation, the unit is Nm 3 /h；tRepresenting time;Trepresenting a period.
In the step S3, a dynamic numerical model of the process flow is established by utilizing HYSYS based on the first outlet boundary condition obtained in the step S1, and the model is used for describing the operation condition of the macroscopic process flow. And applying shaking disturbance boundary conditions to the dynamic numerical model of the process flow, exploring the response conditions of the process flow to the disturbance, namely mainly monitoring the operation conditions of important nodes and equipment, including monitoring the pressure, temperature, flow, outlet quality indexes and other factors of the important nodes, such as inlet and outlet pressure of each stage of compressor, inlet and outlet flow of natural gas, water dew point and hydrocarbon dew point of outlet gas, vapor pressure of condensate oil and other important indexes, and monitoring the operation conditions of the equipment, thereby obtaining the sea state boundary conditions of the influence of shaking on an experimental device and providing a corresponding optimization control strategy. For example, when the compressor of the process is surging, giving an optimal control strategy for this situation, the method of setting back flow may be improved on the process. The control logic is optimized by using a mathematical means through the scheme, so that the robustness and the efficiency of the process operation are improved.
In this embodiment, the device flow analysis is described as an example. Device flow variation caused by inertial force term:；/>the method comprises the steps of carrying out a first treatment on the surface of the In the above-mentioned method, the step of,v L for the flow rate of the liquid,v g is the gas flow rate, and the unit is m/s 2 ；ρ H In order to achieve a homogeneous density,ρ f is true density in kg/m 3 ；βIs the volume air content;ρ g is the gas density;ρ L is liquid density in kg/m 3 ；pIs thatxAverage pressure at the section in Pa;vis thatxAverage velocity at the section in m/s; a is the cross-sectional area through which fluid flows, in m 2 ；θThe unit is rad for the included angle between the inertia force and the fluid movement direction;xin order to control the horizontal distance of the body from the coordinate axis,zfor controlling the vertical distance of the body from the coordinate axis, the unit is m.
Based on the dynamic numerical model of the process flow, calculating and analyzing the change process of the equipment flow in the process flow, and fitting to generate a formula to obtain the sea state boundary condition of the influence of shaking on the experimental device.
In the step S4, a dynamic numerical model of the overall process operation is constructed by utilizing HYSYS based on the second outlet boundary condition given in the step S2 and the optimization control strategy given in the step S3, and the model is used for describing the operation condition of the overall process. Applying shaking disturbance conditions on an inlet, analyzing the response condition of a process to the disturbance, and monitoring the operation states of important nodes and equipment, wherein the operation states of the important nodes comprise monitoring the inlet and outlet pressure and flow of compressors at all levels, the quality index of outlet fluid and the like, the operation states of the equipment comprise monitoring whether the compressors are in surge or not, whether the liquid level of a separator is too high or not and the like, observing the parameter disturbance condition of the important nodes and the equipment, evaluating the adaptability of the whole process to the disturbance, and obtaining the sea state boundary conditions of the influence of shaking on the treatment process. At the same time, corresponding improvements are given. In the embodiment, considering the limitations of experimental conditions and cost of large equipment, the process is evaluated by adopting a simplified experiment and a numerical model building mode, so that the comprehensive and objective evaluation of the sloshing adaptability of the offshore natural gas treatment process is realized.
Due to the natural gas liquefaction systemThe system is a pressurized system, so that a viscous force similarity criterion and a pressure similarity criterion are applied when a mathematical model is established, and the obtained results of the Reynolds number and the Euler number are brought into a second law of fluid flow to obtain the sea condition boundary condition of the influence of shaking on the treatment process. Specifically, the flow of the actual system (i.e., the system prototype) is calculated by the following flow formula:。
in the above, subscripts of parametersnRepresenting a system prototype;Dthe diameter of the pipeline, m;pis thatxAverage pressure at section, pa;vis thatxAverage velocity at section, m/s;ρis the density kg/m of the fluid 3 ；AFor the cross-sectional area m through which the fluid flows 2 ；λIs Darcy hydraulic friction coefficient;ggravitational acceleration, m/s2;αrad is the included angle between the fluid flow direction and the horizontal axis;θrad is the included angle between the inertia force and the fluid movement direction;xin order to control the horizontal distance of the body from the coordinate axis,zfor controlling the vertical distance between the body and the coordinate axis, m;δ 1 the scale is the scale of an actual system and a model system;mrepresenting an experimental model;Tthe period is represented by s;R 0 expressed as a rocking angle in rad.
Based on the flow, analyzing the flow change, fitting to generate a formula, and obtaining the sea state boundary condition of the influence of shaking on the treatment process.
The sea condition boundary conditions affecting the experimental device and the treatment process by the shaking are obtained through the steps, the shaking adaptability of the offshore natural gas treatment process is evaluated according to the interval size of the boundary conditions, namely, the shaking adaptability of the offshore natural gas treatment process is comprehensively, objectively and accurately evaluated through microscopic and macroscopic analysis.
As another implementation manner, the present example also performs start-stop simulation, inlet disturbance analysis, etc. of the process, and examines the operation condition of the dynamic process model from more angles.
In the numerical simulation shaking analysis of the device, the flow and distribution states of gas and liquid phases and the quality indexes of the outlet (such as the water dew point of the gas phase outlet of the dehydration absorption tower, the content of acidic substances of the gas phase outlet of the deacidification absorption tower, the temperature of the outlet of the heat exchanger and the like) are monitored, the response conditions of the indexes to shaking boundary conditions are inspected, and boundary conditions of detour conditions of outlet logistics parameters are obtained; in dynamic simulation shaking analysis of the process, monitoring an outlet quality index of the process and the running condition of equipment, introducing an outlet boundary condition obtained by numerical simulation of the equipment into a process model as an index of disturbance, and examining the response condition of the running of the process to the disturbance. The embodiment realizes comprehensive, objective and accurate evaluation of the sloshing adaptability of the offshore natural gas treatment process through microscopic and macroscopic analysis.
Example two
The embodiment provides a marine natural gas treatment process sloshing adaptability evaluation system, which comprises:
the first outlet boundary condition acquisition module is used for establishing an experimental model of the gas-liquid coexisting equipment, carrying out shaking disturbance experiments on the experimental model by utilizing the shaking experimental platform, monitoring the running states of all the equipment in the experimental model, obtaining a first outlet boundary condition and giving an improvement strategy for all the equipment;
the second outlet boundary condition acquisition module is used for establishing a numerical simulation model of the gas-liquid coexisting equipment, performing numerical simulation based on an improvement strategy, and analyzing the influence of shaking disturbance on the equipment to obtain a second outlet boundary condition;
the equipment sloshing adaptability evaluation module is used for establishing a dynamic numerical model of a process flow based on the first outlet boundary condition, adding sloshing disturbance conditions, monitoring the running conditions of important nodes and equipment, obtaining the sea state boundary condition of the influence of the sloshing on the experimental device, and giving out a corresponding optimization control strategy;
and the sloshing adaptability evaluation module is used for constructing a dynamic numerical model of the whole process operation based on the second outlet boundary condition and the optimal control strategy, adding sloshing disturbance conditions, monitoring the operation states of important nodes and equipment, evaluating the adaptability of the whole process to disturbance, and obtaining the sea state boundary condition of the influence of the sloshing on the treatment process.
The steps involved in the second embodiment correspond to those of the first embodiment of the method, and the detailed description of the second embodiment can be found in the related description section of the first embodiment.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (4)
1. The method for evaluating the sloshing adaptability of the offshore natural gas treatment process is characterized by comprising the following steps of:
establishing an experimental model of gas-liquid coexisting equipment, carrying out shaking disturbance experiment on the experimental model by utilizing a shaking experimental platform, monitoring the running state of each equipment in the experimental model to obtain a first outlet boundary condition, and giving an improvement strategy for each equipment;
establishing a numerical simulation model of the gas-liquid coexisting equipment, performing numerical simulation based on an improvement strategy, and analyzing the influence of shaking disturbance on the equipment to obtain a second outlet boundary condition;
based on the first outlet boundary condition, a dynamic numerical model of the process flow is established, shaking disturbance conditions are added, the running conditions of important nodes and equipment are monitored, sea state boundary conditions of the shaking on the experimental device are obtained, and a corresponding optimization control strategy is given;
based on the second outlet boundary condition and the optimal control strategy, a dynamic numerical model of the whole process operation is constructed, shaking disturbance conditions are added, the operation states of important nodes and equipment are monitored, the adaptability of the whole process to disturbance is evaluated, and sea state boundary conditions of the influence of shaking on the treatment process are obtained;
the monitoring of the running state of each device in the experimental model comprises the following steps:
monitoring logistics distribution, shell side bias flow and heat exchange coefficient of the heat exchanger; monitoring a plurality of quality index parameters and gas-liquid fluctuation states of the separator and the gas-liquid phase outlet of the tower, wherein the plurality of quality index parameters comprise the water dew point of the gas phase outlet of the dehydration absorption tower, the content of acidic substances of the gas phase outlet of the deacidification absorption tower and the temperature of the outlet of the heat exchanger;
analyzing the influence of the shaking disturbance on the equipment to obtain a second outlet boundary condition, including:
obtaining disturbance change data of temperature, flow and pressure of the heat exchanger, the separator and the outlet of the tower;
fitting based on the acquired data to obtain a second outlet boundary condition;
in the process of obtaining the boundary conditions of the shaking on the experimental device, monitoring the operation conditions of the important nodes and the equipment, wherein the operation conditions of the important nodes are monitored by the following steps:
monitoring inlet and outlet pressure of each stage of compressor, inlet and outlet flow of natural gas, water dew point and hydrocarbon dew point of outlet gas and vapor pressure of condensate oil;
in the process of obtaining the sea state boundary conditions of the influence of shaking on the treatment process, the operation states of important nodes and equipment are monitored, and the method comprises the following steps:
monitoring the operation state of the important nodes, including monitoring the inlet and outlet pressure and flow of each stage of compressors and the quality index of outlet fluid;
monitoring the operating conditions of the apparatus includes monitoring whether a surge has occurred in the compressor and whether the liquid level in the separator is too high.
2. The method for evaluating sloshing suitability of an offshore natural gas treatment process according to claim 1, wherein the gas-liquid coexisting device comprises a heat exchanger, a separator and a tower.
3. An offshore natural gas treatment process sloshing adaptability evaluation system is characterized by comprising:
the first outlet boundary condition acquisition module is used for establishing an experimental model of the gas-liquid coexisting equipment, carrying out shaking disturbance experiments on the experimental model by utilizing the shaking experimental platform, monitoring the running states of all the equipment in the experimental model, obtaining a first outlet boundary condition and giving an improvement strategy for all the equipment;
the second outlet boundary condition acquisition module is used for establishing a numerical simulation model of the gas-liquid coexisting equipment, performing numerical simulation based on an improvement strategy, and analyzing the influence of shaking disturbance on the equipment to obtain a second outlet boundary condition;
the equipment sloshing adaptability evaluation module is used for establishing a dynamic numerical model of a process flow based on the first outlet boundary condition, adding sloshing disturbance conditions, monitoring the running conditions of important nodes and equipment, obtaining the sea state boundary condition of the influence of the sloshing on the experimental device, and giving out a corresponding optimization control strategy;
the process sloshing adaptability evaluation module is used for constructing a dynamic numerical model of the whole process operation based on the second outlet boundary condition and the optimization control strategy, adding sloshing disturbance conditions, monitoring the operation states of important nodes and equipment, evaluating the adaptability of the whole process to disturbance, and obtaining the sea state boundary condition of the influence of the sloshing on the treatment process;
the monitoring of the running state of each device in the experimental model comprises the following steps:
monitoring logistics distribution, shell side bias flow and heat exchange coefficient of the heat exchanger; monitoring a plurality of quality index parameters and gas-liquid fluctuation states of the separator and the gas-liquid phase outlet of the tower, wherein the plurality of quality index parameters comprise the water dew point of the gas phase outlet of the dehydration absorption tower, the content of acidic substances of the gas phase outlet of the deacidification absorption tower and the temperature of the outlet of the heat exchanger;
analyzing the influence of the shaking disturbance on the equipment to obtain a second outlet boundary condition, including:
obtaining disturbance change data of temperature, flow and pressure of the heat exchanger, the separator and the outlet of the tower;
fitting based on the acquired data to obtain a second outlet boundary condition;
in the process of obtaining the boundary conditions of the shaking on the experimental device, monitoring the operation conditions of the important nodes and the equipment, wherein the operation conditions of the important nodes are monitored by the following steps:
monitoring inlet and outlet pressure of each stage of compressor, inlet and outlet flow of natural gas, water dew point and hydrocarbon dew point of outlet gas and vapor pressure of condensate oil;
in the process of obtaining the sea state boundary conditions of the influence of shaking on the treatment process, the operation states of important nodes and equipment are monitored, and the method comprises the following steps:
monitoring the operation state of the important nodes, including monitoring the inlet and outlet pressure and flow of each stage of compressors and the quality index of outlet fluid;
monitoring the operating conditions of the apparatus includes monitoring whether a surge has occurred in the compressor and whether the liquid level in the separator is too high.
4. An offshore natural gas treatment process sloshing suitability evaluation system according to claim 3 wherein the gas-liquid co-existence equipment comprises a heat exchanger, a separator, a tower.
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