Ultrahigh-compression-ratio injection supercharging device based on hierarchical regulation and control

Abstract

The invention relates to the technical field of fluid supercharging applied to internal combustion engines, in particular to an ultrahigh compression ratio injection supercharging device based on hierarchical regulation and control. Comprising a main pipe flow system, a graded regulation and control ejection flow system and a controller, the main pipe flow system is characterized in that a main pipe flow system pressure regulating pry receives initial high-pressure gas in an upstream pipeline, depressurizes the initial high-pressure gas to obtain medium-pressure gas, and conveys the medium-pressure gas to the supercharging equipment; the supercharging equipment pressurizes the medium-pressure gas into high-pressure gas and sends the high-pressure gas to the downstream pipeline; the graded regulation and control ejection flow system comprises multiple grades of ejectors and high-pressure regulating valves, low-pressure check valves, medium-pressure regulating valves and pressure sensors corresponding to the ejectors of all the grades, and the regulation and control ejection flow system corresponding to the multiple grades is formed. The device provided by the invention can recover gas fluid emptied by the supercharging equipment and pressurize and inject the gas fluid back into an inlet of the supercharging equipment for reutilization, so that the energy of working fluid is more effectively utilized, the overall efficiency is improved, and fluid recovery with an ultrahigh compression ratio is realized.

Description

Technical Field

[0001] The invention relates to the technical field of fluid supercharging applied to internal combustion engines, and in particular to an ultra-high compression ratio injection supercharging device based on graded regulation. Background Art

[0002] In the gas fluid delivery system, the boosting equipment is a key component to achieve efficient gas fluid delivery. Its working principle is similar to the boosting technology of internal combustion engines. For example, internal combustion engines use turbocharging or mechanical supercharging to increase the intake pressure to enhance combustion efficiency. The boosting equipment in the gas delivery system also achieves more efficient delivery by increasing the gas pressure. However, under high-pressure delivery conditions, due to the limitations of the sealing system, gas fluid leakage is inevitable, which not only leads to energy waste, but also may cause environmental pollution. Therefore, advanced exhaust gas recirculation systems are used in internal combustion engines to minimize leakage losses by introducing gas fluid recovery and reuse. This technical improvement can not only significantly improve energy utilization efficiency, but also bring considerable economic and environmental benefits.

[0003] Among the current gas and fluid recovery technologies, some first recover the vented gas fluid in a gas tank and then transport it to other places for other processes such as combustion, compression or liquefaction. This requires additional storage space, increases transportation costs, and the gas fluid cannot be directly reused in the original system; some use the mechanical energy output by the expander as power to pressurize the vented gas fluid and then input it into the main flow system. It is necessary to first use the high-pressure gas fluid to convert the pressure energy into mechanical energy through the expander, and then use the mechanical energy as the pressure energy for recovering the vented gas fluid. The process is complicated and requires additional machinery to achieve energy conversion; some use a reciprocating compressor to pressurize the vented gas fluid and inject it back to the inlet of the boosting equipment, but the reciprocating compressor is a high-speed rotating machine that requires additional electricity, and the reciprocating machine has many wearing parts, which adds additional costs.

[0004] In addition to the above-mentioned technologies, the ejection technology uses a small amount of fluid in the main flow system as the power fluid, sucks out the fluid, and injects it into the inlet of the boosting equipment, the distribution port or the fuel pipe after pressurization. The ejection device is more frequently used due to its simplicity and cost-effectiveness. The ejection device has no rotating equipment, no wearing parts, and does not consume electrical energy. It only adds corresponding pipelines. The equipment occupies a small space. By utilizing the mutual conversion of pressure energy, it can realize the pressurization of low-pressure gas fluid. However, the boosting capacity of a single-stage ejection flow system is usually limited, and it is difficult to achieve fluid recovery with an ultra-high compression ratio. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an ultra-high compression ratio ejector boosting device based on graded regulation. The device includes: a main flow system, a graded regulated ejector system and a controller; the main flow system includes: the main flow system pressure regulating skid receives the initial high-pressure gas in the upstream pipeline and reduces the pressure to obtain medium-pressure gas, and transports the medium-pressure gas to the boosting equipment; the boosting equipment pressurizes the medium-pressure gas into high-pressure gas and sends it to the downstream pipeline; the graded regulated ejector system includes: multiple levels of ejectors and high-pressure regulating valves, low-pressure check valves, medium-pressure regulating valves and pressure sensors corresponding to each level of ejectors, forming a corresponding multiple-level regulated ejector system; the device proposed by the present invention can recover the gas fluid vented by the boosting equipment and pressurize it back to the inlet of the boosting equipment for reuse, thereby more effectively utilizing the energy of the working fluid, improving the overall efficiency, and realizing ultra-high compression ratio fluid recovery.

[0006] The present invention adopts the following technical scheme: an ultra-high compression ratio ejection supercharging device based on graded regulation, comprising: a main flow system, a graded regulation ejection flow system and a controller; The main flow system includes: a main flow system pressure regulating skid and a pressure boosting device; The main flow system pressure regulating skid receives the initial high-pressure gas in the upstream pipeline, reduces the pressure to obtain medium-pressure gas, and transmits the medium-pressure gas to the boosting device; the boosting device pressurizes the medium-pressure gas into high-pressure gas and sends it to the downstream pipeline; The hierarchical control ejection flow system comprises: ejectors of multiple levels and high-pressure control valves, low-pressure check valves, medium-pressure control valves and pressure sensors corresponding to ejectors of each level, forming a corresponding multiple-level control ejection flow system; The high-pressure regulating valve is installed in the high-pressure inlet pipeline of the ejector, and is used to receive the initial high-pressure gas in the upstream pipeline and perform pressure regulation to obtain the working gas of the ejector; The low-pressure check valve is installed in the low-pressure inlet pipe of the ejector and is used to receive the working gas of the previous ejector as the ejected gas of the next ejector; The ejector mixes the working gas and the ejected gas to form outlet medium-pressure gas; The medium-pressure regulating valve is installed on the medium-pressure outlet pipeline of the ejector, and is used to adjust the pressure of the outlet medium-pressure gas and transmit it to the boosting equipment.

[0007] Furthermore, the boosting device pressurizes the medium-pressure gas into working high-pressure gas and sends it to the downstream pipeline, and also includes: When the boosting device pressurizes the medium-pressure gas into high-pressure gas, part of the medium-pressure gas is vented by the boosting device and converted into vented low-pressure gas; The vented low-pressure gas is transmitted to a staged control jet flow system.

[0008] Furthermore, the low-pressure check valve is installed at the low-pressure inlet pipe of the ejector, and is used to receive the working gas of the previous ejector, including: The low-pressure check valve corresponding to the first-stage ejector receives the vented low-pressure gas as the ejected gas of the first-stage ejector; The low-pressure check valve corresponding to the second-stage ejector receives the working gas of the first-stage ejector as the ejected gas of the second-stage ejector; It is received downward in sequence until the ejected gas from the last stage ejector is obtained.

[0009] Furthermore, the number of levels of the multiple-level regulating and ejecting fluid system is obtained according to the following method: Obtain the pressure ratio of high-pressure gas to low-pressure gas in the main flow system to obtain the expansion ratio; Obtain the pressure ratio of the medium-pressure gas and the low-pressure gas in the main flow system to obtain the compression ratio; The number of levels for regulating the jet flow system is selected in the setting parameter table according to the values ​​of the expansion ratio and the compression ratio.

[0010] Furthermore, the high-pressure regulating valve is installed at the high-pressure inlet pipeline of the ejector, and is used to receive the initial high-pressure gas in the upstream pipeline and perform pressure regulation, including: The high-pressure regulating valve corresponding to each level of ejector receives the initial high-pressure gas in the upstream pipeline respectively to obtain the working gas for each level of ejector.

[0011] Furthermore, the controller uses a reduced-order proxy model to control the high-pressure regulating valve, the low-pressure check valve and the medium-pressure regulating valve in the graded control injection flow system.

[0012] Furthermore, the reduced-order proxy model is specifically: According to the historical operation data of the main flow system, obtain the typical operation conditions in the historical operation data, the change rules between the gas seal gas venting flow rate and pressure and the operation conditions of the boosting equipment; The reduced-order proxy model is constructed based on a neural network, and the reduced-order proxy model is fitted according to the change rule.

[0013] Furthermore, the reduced-order proxy model is fitted, including: taking the minimum injection pressure fluctuation, the minimum injection energy loss and the stable operation of the boosting equipment as the goals, establishing a simulation model with the venting flow, pressure and graded regulation of the injection flow system structure as the control object, and obtaining a fitted reduced-order proxy model.

[0014] The beneficial effects of the present invention are as follows: the present invention fully utilizes the pressure difference formed by the main flow system due to the pressure reduction of the upstream high-pressure gas fluid through the pressure regulating skid to the medium-pressure gas fluid suitable for the operation of the supercharging equipment, and uses the gas energy that is wasted as heat energy due to friction loss at the pressure regulating skid. When the flow rate of the high-pressure gas in the main flow system is generally large enough, the matching design is carried out according to the flow rate of the vented gas of the actual supercharging equipment, and only a small part of the high-pressure gas flow rate is needed to realize the recovery of the vented gas, and the obvious effects brought about are as follows: In the graded control injection flow system, the injection process is divided into multiple stages, and the fluid pressure is increased step by step in each stage. This step-by-step pressurization method can more effectively utilize the energy of the working fluid, reduce energy loss, and improve overall efficiency; By increasing pressure step by step, the energy of the working fluid is more fully utilized, and more kinetic energy is converted into pressure energy. Compared with the single-stage jet flow system, the multi-stage jet flow system has less loss in the energy conversion process, thereby improving the overall energy utilization rate. At the same time, it can reduce the load of each stage of the jet flow system, reduce the pressure fluctuation and vibration of the system, and improve the stability and operation efficiency of the system; The controller designed in the present invention can solve the technical problems of precise design and control of the entire system, ensure the flow and pressure matching of each stage of the induced flow system, avoid the influence of flow imbalance or pressure fluctuation on the system, and form a safe and efficient operation control logic under all working conditions, so as to recover the vented gas to the greatest extent under the premise of ensuring the stable operation of the boosting equipment. Through graded regulation, the pressure of each stage of the induced flow system can be controlled more accurately to avoid damage to the system caused by excessive high or low pressure. Accurate pressure control helps to extend the service life of the equipment and improve the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a structural schematic diagram of an ultra-high compression ratio injection supercharging device based on graded regulation according to an embodiment of the present invention; Figure 2 It is a flow chart of a method for graded-coupling multi-objective coordinated control of a graded-controlled jet flow system under variable working conditions according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of an ultra-high compression ratio injection supercharging device based on graded regulation according to another embodiment of the present invention; Among them, 1. Main flow system; 101. Initial high-pressure gas in the upstream pipeline; 102. Main flow system pressure regulating skid; 103. Medium-pressure gas in the working of boosting equipment; 104. Booster equipment; 105. High-pressure gas in the downstream pipeline; 106. Low-pressure gas to be vented; 2. Gradual regulation and control of ejector flow system; 21. First-stage ejector flow system; 211. First-stage ejector; 212. First-stage high-pressure regulating valve; 213. First-stage low-pressure check valve; 214. First-stage medium-pressure regulating valve; 215. First-stage pressure sensor; 22. Second-stage ejector flow system; 221. Second-stage ejector; 222. Second-stage high-pressure regulating valve; 223. Second-stage low-pressure check valve; 224, second-stage medium-pressure regulating valve; 225, second-stage pressure sensor; 23, third-stage ejector flow system; 231, third-stage ejector; 232, third-stage high-pressure regulating valve; 233, third-stage low-pressure check valve; 234, third-stage medium-pressure regulating valve; 235, third-stage pressure sensor; 22-2(n-1), 2nd to (n-1)th-stage ejector flow systems; 2n, nth-stage ejector flow system; 2n1, nth-stage ejector; 2n2, nth-stage high-pressure regulating valve; 2n3, nth-stage low-pressure check valve; 2n4, nth-stage medium-pressure regulating valve; 2n5, nth-stage pressure sensor; 3, controller. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A schematic diagram of a process flow of an ultra-high compression ratio injection supercharging device based on graded regulation according to an embodiment of the present invention is shown in FIG. Figure 1 As shown, it includes: a main flow system 1, a graded control injection flow system 2 and a controller 3, which are specifically as follows: The main flow system 1 includes an initial high-pressure gas 101 from an upstream pipeline, a main flow system pressure regulating skid 102, a medium-pressure gas 103 for the working of the boosting equipment, a boosting equipment 104, a high-pressure gas 105 in a downstream pipeline, and a vented low-pressure gas 106. The main flow system pressure regulating skid 102 receives the initial high-pressure gas 101 from the upstream pipeline and reduces the pressure, thereby reducing the pressure of the initial high-pressure gas 101 from the upstream pipeline into a medium-pressure gas 103 suitable for the subsequent working of the boosting equipment, and transports the medium-pressure gas 103 for the working of the boosting equipment to the boosting equipment 104; the boosting equipment 104 pressurizes the medium-pressure gas 103 of the boosting equipment into a high-pressure gas 105 of a downstream pipeline and sends it to the downstream pipeline. A small amount of gas leaks due to the airtightness of the boosting equipment and becomes unusable gas and can only be vented into a low-pressure gas 106.

[0019] The graded control ejector flow system 2 comprises a first-stage ejector 211, a first-stage high-pressure regulating valve 212, a first-stage low-pressure check valve 213, and a first-stage medium-pressure regulating valve 214; Figure 1 It also includes the 2nd to (n-1)th level ejector fluid system 22-2(n-1), specifically: 2n, the nth level ejector fluid system; the nth level ejector 2n1, the nth level high-pressure regulating valve 2n2, the nth level low-pressure check valve 2n3, the nth level medium-pressure regulating valve 2n4 and the nth level pressure sensor 2n5.

[0020] Table 1 Schematic diagram of matching selection of the number of stages of the graded control jet flow system ; In the embodiment of the present invention, the graded control ejector flow system is composed of one or more ejectors connected in series to form a first-stage ejector flow system to an n-th-stage ejector flow system. The specific number of ejector pipes required can be matched and selected through Table 1 according to the relationship between the expansion ratio (the pressure ratio of the high-pressure gas to the low-pressure gas) and the compression ratio (the pressure ratio of the medium-pressure gas to the low-pressure gas).

[0021] The hierarchical control ejection flow system 2 in the embodiment of the present invention includes ejectors, high-pressure regulating valves, low-pressure check valves, and medium-pressure regulating valves at various levels for the first-level ejection flow system to the n-th-level ejection flow system; the ejectors at various levels use their own high-pressure inlet gas to eject low-pressure inlet gas to mix and form outlet medium-pressure gas; taking the first-level hierarchical control ejection flow system 2 in the figure as an example, its connection form is that the first-level high-pressure regulating valve 212 is at the high-pressure inlet pipeline of the first-level ejector 211, and is used to receive the initial high-pressure gas 101 of the upstream pipeline and perform pressure regulation to obtain the working gas of the first-level ejector 211; the first-level low-pressure check valve 213 is at the low-pressure inlet pipeline of the first-level ejector 211, and is used to receive the working gas of the upper-level ejector as the ejected gas of the next-level ejector; and is also used to prevent the low-pressure gas from returning. flow and affect the normal operation of the boosting equipment of the main flow system; among them, only the first-stage low-pressure check valve 213 directly receives the low-pressure gas 106 vented from the boosting equipment 104 as the low-pressure injected gas of the first-stage ejector. If there are subsequent stages, the low-pressure check valves of the subsequent stages successively receive the medium-pressure outlet gas from the ejection pipeline of the previous stage as their own low-pressure injected gas. Through such a connection form, the step-by-step pressurization of the entire graded control ejection flow system is realized; the first-stage medium-pressure regulating valve 214 is located at the medium-pressure outlet pipeline of the first-stage ejector 211, and is used to adjust the pressure of the outlet medium-pressure gas and transmit it to the boosting equipment 104; the medium-pressure regulating valves of each level are connected to the inlet of the boosting equipment, so as to realize the reinjection of the vented gas after pressurization, and adjust the flow pressure of the medium-pressure gas at the outlet of each stage of the ejector according to the signal of the controller.

[0022] In the embodiment of the present invention, the controller 3 is equipped with a multi-objective coordinated control method for graded control of the ejector flow system with variable working conditions. First, the working conditions are sorted out, a process model is built to study the impact of changes, and a reduced-order proxy model of the graded control ejector flow system is further constructed. Finally, online simulation is performed to analyze the performance and effect of the control to complete the multi-objective coordinated control, thereby adjusting the flow pressure of the medium-pressure gas at the outlet of each level of ejectors. The specific process diagram is shown in FIG. Figure 2 As shown, specifically including: The operating conditions are sorted out as follows: Based on the equipment history and historical operation data of the main flow system and the boosting equipment therein, the relationship between its historical typical operating conditions and the gas-sealed gas venting flow and pressure and the boosting equipment operating conditions are sorted out, and the sealing gas venting rules under the typical operating conditions of the gas boosting equipment are summarized.

[0023] The process model is built to study the impact of changes: Based on the process simulation model, the changing rules between the air-seal gas venting flow and pressure and the speed of the boosting equipment under variable working conditions are studied, as well as the influence of the graded control of the ejector flow system on the working performance of the boosting equipment.

[0024] The reduced-order proxy model of the hierarchical control jet flow system is constructed as follows: based on a deep learning neural network, a reduced-order proxy model of the hierarchical control jet flow system is constructed, and after determining the input and output parameters, a set of variables that best describe the model characteristics is obtained, thereby establishing a strong correlation mapping relationship between the parameters, thereby improving the model operation effect; the total pressure and total temperature of the inlet and outlet fluids, and the maximum pressure gradient of the entire fluid domain are selected as the input and output of the model to simulate the gas mixing process and reflect the working characteristics of the system; the reduced-order proxy model simplifies the high-dimensional, high-fidelity model and retains its main features, thereby maintaining sufficient accuracy while reducing the computational cost, and further uses the neural network to capture the high-dimensional complex nonlinear relationship of the hierarchical control jet flow system to generate an efficient proxy model. In scenarios that require rapid response, the reduced-order proxy model can provide approximate results to meet real-time requirements.

[0025] The online simulation is as follows: training the constructed reduced-order proxy model of the graded-regulated ejector flow system to accurately determine the relationship between the venting flow, pressure and the graded-regulated ejector flow system structure; combining the actual operating conditions of the main flow system and the boosting equipment therein, with the goal of minimizing the ejection pressure fluctuation, minimizing the ejection energy loss and stabilizing the operation of the boosting equipment, a variable-condition graded-coupled multi-objective coordinated control method with the venting flow, pressure and graded-regulated ejector flow system structure as the control objects is established, and by analyzing the online simulation effect and performance, the vented gas can be recovered to the greatest extent while ensuring the stable operation of the boosting equipment.

[0026] In another specific embodiment of the present invention: like Figure 3 As shown, the present invention provides an ultra-high compression ratio ejector device based on graded regulation, comprising a main flow system 1, a graded regulation ejector flow system 2, and a controller 3, wherein: The parameters of the main flow system 1 in this embodiment come from a certain site, including the initial high-pressure gas 101 from the upstream pipeline, the main flow system pressure regulating skid 102, the medium-pressure gas 103 of the boosting equipment, the boosting equipment 104, the high-pressure gas 105 going to the downstream pipeline and the vented low-pressure gas 106.

[0027] In this embodiment, the initial high-pressure gas 101 from the upstream pipeline is the mass and energy source of the main flow system 1, and its pressure is 7-8 MPa; the main flow system pressure regulating skid 102 regulates and reduces the pressure of the initial high-pressure gas 101 from the upstream pipeline into a medium-pressure gas 103 suitable for the subsequent operation of the boosting equipment, and the pressure of the medium-pressure gas after the reduction is 3.8 MPa; the boosting equipment 104 pressurizes most of the medium-pressure gas after the pressure reduction by the main flow system pressure regulating skid 102 to become a high-pressure gas 105 that goes to the downstream pipeline. A small part of the gas leaks due to the airtightness of the boosting equipment 104 and becomes unusable gas and can only be discharged to become a low-pressure gas 106, and its pressure is 0.1 MPa.

[0028] According to the actual working condition of the main flow system 1, the expansion ratio and compression ratio of the graded control jet flow system 2 are calculated in this embodiment, and the expansion ratio is 70 and the compression ratio is 38. The matching selection of the number of stages of the graded control jet flow system in this embodiment is carried out through Table 1, so it is concluded that three stages of injection are required to achieve the injection target pressure. Therefore, the graded control jet flow system 2 in this embodiment is composed of three ejectors connected in series to form a first-stage ejection flow system 21, a second-stage ejection flow system 22 and a third-stage ejection flow system 23.

[0029] In this embodiment, the first-stage ejection flow system 21 includes a first-stage ejector 211, a first-stage high-pressure regulating valve 212, a first-stage low-pressure check valve 213, and a first-stage medium-pressure regulating valve 214; the second-stage ejection flow system 22 includes a second-stage ejector 221, a second-stage high-pressure regulating valve 222, a second-stage low-pressure check valve 223, and a second-stage medium-pressure regulating valve 224; the third-stage ejection flow system 23 includes a third-stage ejector 231, a third-stage high-pressure regulating valve 232, a third-stage low-pressure check valve 233, and a third-stage medium-pressure regulating valve 234; the ejectors of each stage (the first-stage ejector 211, the second-stage ejector 221, and the third-stage ejector 231) The working gas and the ejector low-pressure inlet gas are mixed to form the outlet medium-pressure gas; the connection form is that the high-pressure regulating valves of each stage (the first-stage high-pressure regulating valve 212, the second-stage high-pressure regulating valve 222, and the third-stage high-pressure regulating valve 232) are respectively in the high-pressure inlet pipelines of the ejectors of each stage, the low-pressure check valves of each stage (the first-stage low-pressure check valve 213, the second-stage low-pressure check valve 223, and the third-stage low-pressure check valve 233) are respectively in the low-pressure inlet pipelines of the ejectors of each stage, and the medium-pressure regulating valves of each stage (the first-stage medium-pressure regulating valve 214, the second-stage medium-pressure regulating valve 224, and the third-stage medium-pressure regulating valve 234) are respectively in the medium-pressure outlet pipelines of the ejectors of each stage.

[0030] In this embodiment, the high-pressure regulating valves at each level receive the initial high-pressure gas 101 from the upstream pipeline that is partially diverted from the main flow system 1, and become the working gas of the ejectors at each level, and adjust the flow pressure of the working gas of the ejectors at each level according to the signal of the controller; the low-pressure check valves at each level are used to prevent the backflow of the low-pressure gas from affecting the normal operation of the boosting device 104 of the main flow system; among them, only the first-stage low-pressure check valve 213 directly receives the low-pressure gas 106 discharged from the boosting device 104 as the low-pressure ejected gas of the first-stage ejector 211; the second-stage low-pressure check valve 22 The first-stage medium-pressure gas injected and pressurized from the first-stage ejector 211 is connected as the low-pressure injected gas of the second-stage ejector 221; the third-stage low-pressure check valve 233 is connected to the second-stage medium-pressure gas injected and pressurized from the second-stage ejector 221 as the low-pressure injected gas of the third-stage ejector 231, and the step-by-step pressurization of the entire graded control ejection flow system 2 is realized through such a connection form; the medium-pressure regulating valves of each stage are connected to the inlet of the boosting device 104, so as to realize the reinjection of the pressurized vented gas, and the flow pressure of the medium-pressure gas at the outlet of each stage of the ejector is adjusted according to the signal of the controller.

[0031] In this embodiment, the first-stage ejector 211 uses the initial high-pressure gas 101 of 7 MPa from the upstream pipeline, and the low-pressure gas 106 discharged from the boosting device 104 is 0.1 MPa, and the pressure of the first-stage medium-pressure gas injected into the first-stage medium-pressure gas is 0.65 MPa; the second-stage ejector 221 uses the initial high-pressure gas 101 of 7 MPa from the upstream pipeline, and the first-stage medium-pressure gas pressurized from the first-stage ejector 211 is used as the second-stage low-pressure gas with a pressure of 0.65 MPa, and the pressure of the second-stage medium-pressure gas injected into the second-stage medium-pressure gas is 2.4 MPa; the third-stage ejector 231 uses the initial high-pressure gas 101 of 7 MPa from the upstream pipeline, and the second-stage medium-pressure gas pressurized from the second-stage ejector 221 is used as the third-stage low-pressure gas with a pressure of 2.4 MPa, and the pressure of the medium-pressure gas 103 injected into the boosting device 104 is 3.8 MPa.

[0032] The controller 3 is equipped with a graded coupled multi-objective coordinated control method for variable operating conditions of the graded control ejector fluid system. The method is based on the coupling and coordination characteristics between the gas flow, pressure and the graded control ejector fluid system 2 structure during the operation of the main flow system 1 and the boosting equipment 104 therein. It creates a multi-parameter coordinated control with the goals of minimizing ejection pressure fluctuations, maximizing residual gas recovery utilization rate, minimizing ejection energy loss and stabilizing the operation of the boosting equipment. It achieves precise modulation of the ejector fluid, solves the technical problems of precise design and control of the entire system, and forms a safe and efficient operation control logic for all operating conditions, thereby maximizing the recovery of the vented gas while ensuring the stable operation of the boosting equipment.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-high compression ratio injection supercharging device based on graded regulation, characterized in that: include: Main flow system, graded control jet flow system and controller; The main flow system includes: a main flow system pressure regulating skid and a pressure boosting device; The main flow system pressure regulating skid receives the initial high-pressure gas in the upstream pipeline, reduces the pressure to obtain medium-pressure gas, and transmits the medium-pressure gas to the boosting device; the boosting device pressurizes the medium-pressure gas into high-pressure gas and sends it to the downstream pipeline; The hierarchical control ejection flow system comprises: ejectors of multiple levels and high-pressure control valves, low-pressure check valves, medium-pressure control valves and pressure sensors corresponding to ejectors of each level, forming a corresponding multiple-level control ejection flow system; The high-pressure regulating valve is installed in the high-pressure inlet pipeline of the ejector, and is used to receive the initial high-pressure gas in the upstream pipeline and perform pressure regulation to obtain the working gas of the ejector; The low-pressure check valve is installed in the low-pressure inlet pipe of the ejector and is used to receive the working gas of the previous ejector as the ejected gas of the next ejector; The ejector mixes the working gas and the ejected gas to form outlet medium-pressure gas; The medium-pressure regulating valve is installed on the medium-pressure outlet pipeline of the ejector, and is used to adjust the pressure of the outlet medium-pressure gas and transmit it to the boosting equipment.

2. The ultra-high compression ratio injection supercharging device based on graded regulation according to claim 1 is characterized in that: The boosting device pressurizes the medium-pressure gas into working high-pressure gas and sends it to the downstream pipeline, and also includes: When the boosting device pressurizes the medium-pressure gas into high-pressure gas, part of the medium-pressure gas is vented by the boosting device and converted into vented low-pressure gas; The vented low-pressure gas is transmitted to a staged control jet flow system.

3. The ultra-high compression ratio injection supercharging device based on graded regulation according to claim 2 is characterized in that: The low-pressure check valve is installed on the low-pressure inlet pipeline of the ejector and is used to receive the working gas of the previous ejector, including: The low-pressure check valve corresponding to the first-stage ejector receives the vented low-pressure gas as the ejected gas of the first-stage ejector; The low-pressure check valve corresponding to the second-stage ejector receives the working gas of the first-stage ejector as the ejected gas of the second-stage ejector; It is received downward in sequence until the ejected gas from the last stage ejector is obtained.

4. The ultra-high compression ratio injection supercharging device based on graded regulation according to claim 1 is characterized in that: The number of levels of the multiple-level regulating and ejecting flow system is obtained according to the following method: Obtain the pressure ratio of high-pressure gas to low-pressure gas in the main flow system to obtain the expansion ratio; Obtain the pressure ratio of the medium-pressure gas and the low-pressure gas in the main flow system to obtain the compression ratio; The number of levels for regulating the jet flow system is selected in the setting parameter table according to the values ​​of the expansion ratio and the compression ratio.

5. The ultra-high compression ratio injection supercharging device based on graded regulation according to claim 1 is characterized in that: The high-pressure regulating valve is installed on the high-pressure inlet pipeline of the ejector, and is used to receive the initial high-pressure gas in the upstream pipeline and perform pressure regulation, and includes: The high-pressure regulating valve corresponding to each level of ejector receives the initial high-pressure gas in the upstream pipeline respectively to obtain the working gas for each level of ejector.

6. The ultra-high compression ratio injection supercharging device based on graded regulation according to claim 1 is characterized in that: The controller uses a reduced-order proxy model to control the high-pressure regulating valve, the low-pressure check valve and the medium-pressure regulating valve in the graded control injection flow system.

7. The ultra-high compression ratio injection supercharging device based on graded regulation according to claim 6 is characterized in that: The reduced-order proxy model is specifically: According to the historical operation data of the main flow system, obtain the typical operation conditions in the historical operation data, the change rules between the gas seal gas venting flow rate and pressure and the operation conditions of the boosting equipment; The reduced-order proxy model is constructed based on a neural network, and the reduced-order proxy model is fitted according to the change rule.

8. The ultra-high compression ratio injection supercharging device based on graded regulation according to claim 7 is characterized in that: The reduced-order proxy model is fitted, including: taking the minimum induced pressure fluctuation, the minimum induced energy loss and the stable operation of the boosting equipment as the goals, establishing a simulation model with the venting flow, pressure and graded regulation of the induced flow system structure as the control object, and obtaining a fitted reduced-order proxy model.

Images