Control method and control device for self-adaptive pressure flow of methanol supply skid

Abstract

The invention discloses a control method and a control device for self-adaptive pressure and flow of a methanol supply skid. The control method comprises the following steps: S10, initializing parameters; s20, data are collected in real time, the rotating speed n and the torque T of a host are collected every first time interval, and the actual pressure P and the actual flow Q of methanol supply are collected every second time interval; s30, dynamic deviation calculation is conducted, specifically, the real-time load L of a host is calculated, the target pressure P0 and the target flow Q0 of current methanol supply are determined based on the real-time load L, and the pressure deviation delta P between the actual pressure P of methanol supply and the target pressure P0 and the flow deviation delta Q between the actual flow Q and the target flow Q0 are calculated; s40, output is adjusted in a self-adaptive mode, and if delta P is smaller than or equal to 0.05 MPa and delta Q is smaller than or equal to 5L / h, current adjusting parameters are maintained; if delta Pgt; when the pressure is 0.05 MPa, the pressure and the flow of methanol supply are adjusted in a self-adaptive manner; if delta Qgt; and the methanol supply flow is adjusted in a self-adaptive manner. Therefore, the methanol supply pressure and flow can be adaptively adjusted in real time according to the rotating speed and the torque of the main machine.

Description

Technical Field

[0001] This application relates to the field of methanol fuel supply technology, and more specifically to a method and device for controlling the adaptive pressure and flow of a methanol supply skid. Background Technology

[0002] Methanol, as a low-carbon and clean energy source, has been widely used in power equipment such as ship main engines and industrial gas turbines. Methanol supply skids are the core components for achieving stable fuel delivery. Their supply parameters (pressure and flow rate) need to be matched with the main engine load in real time to ensure combustion efficiency and equipment safety.

[0003] Traditional methanol supply skids employ a "fixed parameter output" mode. When the main engine load fluctuates, the pressure and flow rate of the methanol supply cannot be adjusted synchronously, leading to an imbalance in the air-fuel ratio and a fuel waste rate as high as 10%-15%. Current known improvements rely solely on a single sensor (such as a flow sensor) for adjustment, failing to correlate with core main engine load parameters (such as speed, torque, and exhaust temperature). This results in an adjustment lag exceeding 500ms, easily causing unstable idling or overpressure risks for the main engine. Furthermore, a dynamic correction mechanism based on load-parameter mapping is lacking. Under different ambient temperatures (-10℃-40℃) and fuel purity (85%-99.9%), control accuracy decreases by more than 30%, exhibiting poor adaptability.

[0004] Therefore, a method and device for controlling the adaptive pressure and flow rate of methanol supply skids are needed to at least partially solve the above problems. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, according to a first aspect of this application, a method for controlling the adaptive pressure and flow rate of a methanol supply skid is provided, comprising the following steps: S10: Initialize parameters, Preload the "Main Unit Load - Methanol Parameters" baseline mapping table; S20: Real-time data acquisition, At the first time interval, the rotational speed n and torque T of the host are collected, and at the second time interval, the actual pressure P and actual flow rate Q of the methanol supply are collected. S30: Dynamic deviation calculation Calculate the real-time load L of the host machine. Based on the real-time load L, compare it with the "host load - methanol parameters" benchmark mapping table to determine the current target pressure P0 and target flow rate Q0 of the methanol supply. Calculate the pressure deviation ΔP between the actual pressure P and the target pressure P0 of the methanol supply, and calculate the flow deviation ΔQ between the actual flow rate Q and the target flow rate Q0 of the methanol supply; S40: Adaptive output adjustment, where... If |ΔP|≤0.05MPa and |ΔQ|≤5L / h, maintain the current adjustment parameters. If |ΔP|>0.05MPa, the pressure and flow rate of the methanol supply will be adaptively adjusted. If |ΔQ|>5L / h, the flow rate of the methanol supply will be adaptively adjusted.

[0007] According to the methanol supply skid adaptive pressure and flow control method of this application, the methanol supply pressure and flow can be adaptively adjusted in real time according to the speed and torque of the main unit, so as to achieve millimeter-level precise matching between the methanol supply pressure and flow and the main unit operating conditions.

[0008] Optionally, the real-time load L = (T × n) / (T_max × n_max) × 100%, where T_max is the rated torque of the host and n is the rated speed of the host.

[0009] According to this scheme, based on the above formula, the real-time load of the host can be calculated according to the host's rated torque and rated speed.

[0010] Optionally, S20 further includes: collecting the exhaust temperature T_exh of the host at each first time interval. The S60 further includes: if T_exh>750℃, then automatically reduce the flow rate of the methanol supply.

[0011] According to this solution, by collecting the exhaust temperature of the host in real time, the host overheating can be avoided.

[0012] Optionally, S20 further includes: collecting the ambient temperature T_env every third time interval. The method for controlling the adaptive pressure and flow rate of the methanol supply skid also includes: S50: Dynamic correction and optimization The "host load - methanol parameter" baseline mapping table is revised at each of the third time intervals. For every 5°C decrease in ambient temperature T_env, the target pressure P0 increases by 3% and the target flow rate Q0 increases by 2%.

[0013] According to this solution, the target pressure and target flow of the host can be adjusted for every 5°C decrease in ambient temperature, so as to achieve dynamic correction and optimization and improve adaptability.

[0014] Optionally, S20 further includes: collecting the purity C of the methanol at each of the third time intervals. S50 further includes: for every 5% decrease in the purity C of the methanol, the target pressure P0 increases by 4% and the target flow rate Q0 increases by 3%.

[0015] According to this scheme, when the purity of methanol decreases by 5%, the target pressure and target flow of the main unit can be adjusted to ensure stable combustion efficiency of the main unit.

[0016] Optionally, the step S20, which involves collecting the purity C of methanol at each third time interval, includes: collecting the density of methanol at each third time interval, wherein the purity C of methanol = (ρ_ 实际 / ρ_ 纯甲醇 ()×100%), where ρ_ 实际 The actual density supplied for methanol, ρ_ 纯甲醇 This is the density of pure methanol.

[0017] According to this scheme, the actual purity of the methanol supply is calculated by collecting the methanol density in real time.

[0018] Optionally, the first time is 10ms, and / or The second time is 20ms, and / or The third time is 30 seconds.

[0019] According to a second aspect of this application, a control device is disclosed for performing a methanol supply skid adaptive pressure flow control method according to any of the first aspects described above, the control device comprising: A methanol storage unit, the methanol storage unit comprising a storage tank for storing methanol; The delivery regulating unit includes a variable frequency pressurizing pump, an electromagnetic proportional valve, a pressure sensor, and a flow sensor. The variable frequency pressurizing pump is used to deliver the methanol in the storage tank to the main unit. The electromagnetic proportional valve is used to regulate the flow rate of the methanol supply. The pressure sensor is used to measure the actual pressure of the methanol supply. The flow sensor is used to measure the actual flow rate of the methanol supply. A host load acquisition unit, comprising a speed sensor and a torque sensor, wherein the speed sensor measures the rotational speed of the host, and the torque sensor measures the torque of the host; and The core control unit is communicatively connected to both the conveying regulation unit and the main load acquisition unit to collect data measured by the flow sensor, the pressure sensor, the speed sensor, and the torque sensor. The core control unit possesses an adaptive control algorithm and a dynamic correction model, enabling it to calculate, based on the collected data, the pressure deviation ΔP between the actual methanol supply pressure P and the target pressure P0, and the flow deviation ΔQ between the actual methanol supply flow rate Q and the target flow rate Q0. Furthermore, based on the pressure deviation and the flow deviation, it adaptively outputs adjustment commands to the variable frequency booster pump and / or the electromagnetic proportional valve. If |ΔP|≤0.05MPa and |ΔQ|≤5L / h, maintain the current regulation command; If |ΔP|>0.05MPa, the speed of the variable frequency booster pump and the opening of the electromagnetic proportional valve are adaptively adjusted. If |ΔQ|>5L / h, the opening degree of the electromagnetic proportional valve is adaptively adjusted.

[0020] According to the control device of this application, the pressure and flow rate of methanol supply can be adaptively adjusted in real time according to the speed and torque of the host, so as to achieve millimeter-level precise matching between the methanol supply pressure and flow rate and the operating conditions of the host.

[0021] Optionally, if |ΔP|>0.05MPa, the speed adjustment coefficient Kp of the variable frequency booster pump is ΔP / 0.1MPa, and the opening adjustment coefficient Kv of the electromagnetic proportional valve is ΔP / 0.2MPa; If |ΔQ|>5L / h, the opening adjustment coefficient of the electromagnetic proportional valve is Kq = ΔQ / 10L / h.

[0022] Optionally, the host load acquisition unit further includes an exhaust temperature sensor and an ambient temperature sensor. The exhaust temperature sensor measures the exhaust temperature of the host, and the ambient temperature sensor measures the ambient temperature of the host. The delivery regulation unit further includes a density sensor to measure the density of the methanol, and / or The control device also includes a safety protection unit, which is communicatively connected to the core control unit. The safety protection unit includes an overpressure relief valve, a material shortage alarm module, and an emergency shut-off valve. Attached Figure Description

[0023] The following drawings, which are incorporated herein by reference and used to understand this application, illustrate embodiments of the application and their descriptions, thereby explaining the principles of the application.

[0024] In the attached image: Figure 1 This is a flowchart of a method for controlling the adaptive pressure and flow rate of a methanol supply skid according to a preferred embodiment of this application. Figure 2 This is a schematic diagram illustrating a specific application of the methanol supply skid adaptive pressure and flow control device according to this application.

[0025] Explanation of reference numerals in the attached figures: 10: Host 110: Methanol Storage Unit 111: Storage tank 112: Temperature sensor 113: Liquid level sensor 120: Conveyor Adjustment Unit 121: Variable Frequency Booster Pump 122: Electromagnetic proportional valve 123: Pressure sensor 124: Flow sensor 130: Host Load Acquisition Unit 131: Speed ​​sensor 132: Torque sensor 133: Exhaust Temperature Sensor 140: Core Control Unit 150: Safety Protection Unit Detailed Implementation

[0026] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.

[0027] To fully understand this application, a detailed description will be provided below. It is obvious that the implementation of embodiments of this application is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this application are described in detail below; however, other embodiments may also be available in addition to these detailed descriptions.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0029] In understanding the scope of this application, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of a described feature, element, component, group, whole, and / or step, but do not exclude the presence of other undescribed features, elements, components, groups, wholes, and / or steps. This concept also applies to words with similar meanings, such as the terms "comprising," "having," and their derivatives.

[0030] The term "attached" or "joined" as used herein includes: a construction in which one element is directly fixed to another element by fixing it directly to another element; a construction in which one element is indirectly fixed to another element by fixing it to an intermediate member, which in turn is fixed to another element; and a construction in which one element is integral with another element, that is, one element is substantially part of another element. This definition also applies to words with similar meanings, such as "connect," "joint," "couple," "install," "adhere," "fix," and their derivatives. Finally, degree terms such as "substantially," "approximately," and "approximately" as used herein indicate the amount of deviation from which modifications to the terminology do not significantly alter the final result.

[0031] Ordinal numbers such as “first” and “second” used in this application are merely identifiers and have no other meaning, such as a specific order. Moreover, for example, the term “first component” does not imply the existence of a “second component”, and the term “second component” does not imply the existence of a “first component”.

[0032] It should be noted that the terms “up,” “down,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be restrictive.

[0033] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0034] Unless otherwise stated, the numerical ranges in this document include not only the entire range within its two endpoints, but also the subranges contained therein.

[0035] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0036] This application provides a method for controlling the adaptive pressure and flow of methanol supply skids, which is applicable to dual-fuel ship main engines and industrial power main engines, and is especially suitable for precise control of methanol pressure and flow under dynamic changes in main engine load.

[0037] like Figure 1 As shown, the methanol supply skid adaptive pressure and flow control method according to this application includes the following steps: S10: Initialize parameters, Preload the "Main Unit Load - Methanol Parameters" baseline mapping table; S20: Real-time data acquisition, At the first time interval, the rotational speed n and torque T of the host are collected, and at the second time interval, the actual pressure P and actual flow rate Q of the methanol supply are collected. S30: Dynamic deviation calculation Calculate the real-time load L of the main unit. Based on the real-time load L, compare it with the "Main Unit Load - Methanol Parameters" benchmark mapping table to determine the target pressure P0 and target flow rate Q0 of the current methanol supply. Calculate the pressure deviation ΔP between the actual pressure P and the target pressure P0 of the methanol supply, and calculate the flow deviation ΔQ between the actual flow rate Q and the target flow rate Q0 of the methanol supply. S40: Adaptive output adjustment, where... If |ΔP|≤0.05MPa and |ΔQ|≤5L / h, maintain the current adjustment parameters; If |ΔP|>0.05MPa, the pressure and flow rate of the methanol supply will be adaptively adjusted. If |ΔQ|>5L / h, the methanol supply flow rate will be adaptively adjusted.

[0038] Real-time load L = (T × n) / (T_max × n_max) × 100%, where T_max is the rated torque of the main unit and n is the rated speed of the main unit.

[0039] According to the methanol supply skid adaptive pressure and flow control method of this application, the methanol supply pressure and flow can be adaptively adjusted in real time according to the speed and torque of the main unit, so as to achieve millimeter-level precise matching between the methanol supply pressure and flow and the main unit operating conditions.

[0040] The “Main Unit Load - Methanol Parameters” reference mapping table in S10 is as follows, which shows the correspondence between the main unit load and the target pressure P0 and target flow rate Q0 of methanol supply under common operating conditions.

[0041] S20 further includes: collecting the exhaust temperature T_exh of the main unit at regular intervals. S60 further includes: if T_exh > 750℃, automatically reducing the methanol supply flow rate. This can prevent the main unit from overheating. Preferably, if T_exh > 750℃, the methanol supply flow rate is automatically reduced by 5%-8%.

[0042] Step S20 also includes: collecting the ambient temperature T_env every third time interval. The methanol supply skid adaptive pressure and flow control method also includes: S50: dynamic correction and optimization, correcting the "main unit load - methanol parameter" baseline mapping table every third time interval. When the ambient temperature T_env decreases by 5°C, the target pressure P0 increases by 3%, and the target flow rate Q0 increases by 2%. Thus, when the ambient temperature decreases by 5°C, the target pressure and target flow rate of the main unit can be adjusted to achieve dynamic correction and optimization, thereby improving adaptability.

[0043] S20 further includes: collecting the methanol purity C at every third time interval. S50 further includes: increasing the target pressure P0 by 4% and the target flow rate Q0 by 3% for every 5% decrease in methanol purity C. Thus, when the methanol purity decreases by 5%, the target pressure and target flow rate of the main unit can be adjusted to ensure stable combustion efficiency of the main unit.

[0044] The methanol purity C measured at each third time interval in S20 includes: the methanol density measured at each third time interval, where methanol purity C = (ρ_ 实际 / ρ_ 纯甲醇 ()×100%), where ρ_ 实际 The actual density supplied for methanol, ρ_ 纯甲醇 This is the density of pure methanol. Therefore, by collecting the density of methanol in real time, the actual purity of the supplied methanol can be calculated.

[0045] Preferably, the first time interval is 10ms, the second time interval is 20ms, and the third time interval is 30s. It is understood that the values ​​of the first, second, and third times are not limited to this embodiment. As needed, the first time interval can be 5ms, 6ms, 7ms, 8ms, 9ms, 11ms, 12ms, 13ms, 14ms, 15ms, or any other suitable value; the second time interval can be 10ms, 12ms, 14ms, 16ms, 18ms, 22ms, 24ms, 26ms, 28ms, 30ms, or any other suitable value; and the third time interval can be 20s, 22s, 24s, 26s, 28s, 32s, 34s, 36s, 38s, 40s, or any other suitable value.

[0046] like Figure 2As shown, this application also provides a control device for executing the above-described methanol supply skid adaptive pressure and flow control method. The control device mainly includes a methanol storage unit 110, a conveying and regulating unit 120, a main unit load acquisition unit 130, and a core control unit 140.

[0047] The methanol storage unit 110 includes a storage tank 111, a temperature sensor 112, and a level sensor 113. The storage tank 111 is used to store methanol, and its volume is preferably 5 m³. 3 -20m 3 Temperature sensor 112 is used to measure the temperature of methanol in storage tank 111, and the measurement range of temperature sensor 112 is preferably -20°C to 60°C. Liquid level sensor 113 is used to measure the liquid level of methanol, and its accuracy is preferably ±1mm.

[0048] The delivery regulating unit 120 includes a variable frequency booster pump 121, an electromagnetic proportional valve 122, a pressure sensor 123, and a flow sensor 124. The variable frequency booster pump 121 is used to deliver methanol from the storage tank 111 to the main unit 10 via a delivery pipeline. The maximum head of the variable frequency booster pump 121 is preferably 50 m. The electromagnetic proportional valve 122 is installed in the delivery pipeline to regulate the flow rate of the supplied methanol. The regulation accuracy of the electromagnetic proportional valve 122 is preferably ±0.5%. The pressure sensor 123 is installed in the delivery pipeline to measure the actual pressure of the supplied methanol. The range of the pressure sensor 123 is preferably 0-5 MPa, and the accuracy is preferably ±0.1%. The flow sensor 124 is installed in the delivery pipeline to measure the actual flow rate of the supplied methanol. The range of the flow sensor 124 is preferably 0-1000 L / h, and the accuracy is preferably ±0.2%.

[0049] The main unit load acquisition unit 130 mainly includes a speed sensor 131 and a torque sensor 132. The speed sensor 131 measures the rotational speed of the main unit 10, and its measurement range is preferably 0-3000 rpm. The torque sensor 132 measures the torque of the main unit 10, and its measurement range is preferably 0-5000 N·m. The core control unit 140 is communicatively connected to both the conveying adjustment unit 120 and the main unit load acquisition unit 130, enabling it to acquire data measured by the flow sensor 124, pressure sensor 123, speed sensor 131, and torque sensor 132.

[0050] The core control unit 140 employs an industrial-grade PLC (preferably with a main frequency ≥ 1 GHz and memory ≥ 1 GB). It features an adaptive control algorithm and a dynamic correction model, enabling it to calculate the pressure deviation ΔP (ΔP = P0 - P) between the actual methanol supply pressure P and the target pressure P0, and the flow deviation ΔQ (ΔQ = Q0 - Q) between the actual methanol supply flow rate Q and the target flow rate Q0, based on the collected data. Based on these pressure and flow deviations, it adaptively outputs adjustment commands to the variable frequency booster pump 121 and / or the electromagnetic proportional valve 122. If |ΔP| ≤ 0.05 MPa and |ΔQ| ≤ 5 L / h, the current adjustment command is maintained. If |ΔP| > 0.05 MPa, the core control unit 140 outputs a PWM signal to the variable frequency booster pump 121 to adaptively adjust its speed and the opening of the electromagnetic proportional valve 122, thereby regulating the methanol supply pressure and flow rate. If |ΔQ|>5L / h, the opening of the electromagnetic proportional valve 122 is adaptively adjusted to regulate the flow rate of methanol supply.

[0051] Specifically, the core control unit 140 preloads a "host load - methanol parameter" reference mapping table (see the table above). The speed sensor 131 collects the rotational speed n of the host 10 at first intervals, the torque sensor 132 collects the torque T of the host 10 at first intervals, the pressure sensor 123 collects the actual methanol supply pressure P at second intervals, and the flow sensor 124 collects the actual methanol supply flow rate Q at second intervals. The core control unit 140 collects the data measured by the flow sensor 124, pressure sensor 123, speed sensor 131, and torque sensor 132, and filters the collected data (using a Kalman filter algorithm) to remove interference signals. The core control unit 140 can calculate the real-time load L of the host 10, and based on the real-time load L, compares it with the "host load - methanol parameter" reference mapping table to determine the current target pressure P0 and target flow rate Q0 of the methanol supply. Finally, it calculates the pressure deviation ΔP and flow deviation ΔQ of the methanol supply.

[0052] In a preferred embodiment of this application, if |ΔP|>0.05MPa, the speed adjustment coefficient Kp of the variable frequency booster pump 121 = ΔP / 0.1MPa, and the opening adjustment coefficient Kv of the electromagnetic proportional valve 122 = ΔP / 0.2MPa. That is, every 0.1MPa deviation corresponds to a 50rpm change in the speed of the variable frequency booster pump 121, and every 0.2MPa deviation corresponds to a 5% change in the opening of the electromagnetic proportional valve 122. If |ΔQ|>5L / h, the opening adjustment coefficient Kq of the electromagnetic proportional valve 122 = ΔQ / 10L / h. That is, every 10L / h deviation corresponds to a 3% change in the opening of the electromagnetic proportional valve 122.

[0053] The host load acquisition unit 130 also includes an exhaust temperature sensor 133 and an ambient temperature sensor (not shown). The exhaust temperature sensor 133 measures the exhaust temperature of the host 10, and its measurement range is preferably 0-800℃. The speed sensor 131, torque sensor 132, and exhaust temperature sensor 133 communicate with the host ECU in real time via a CAN bus. The ambient temperature sensor measures the ambient temperature of the host 10. When the ambient temperature T_env decreases by 5℃, the core control unit 140 increases the target pressure P0 by 3% and the target flow rate Q0 by 2%. Thus, when the ambient temperature decreases by 5℃, the target pressure and target flow rate of the host 10 can be adjusted to achieve dynamic correction and optimization, improving adaptability.

[0054] The delivery regulating unit 120 also includes a density sensor for measuring the density of methanol. The purity of methanol, C = (ρ_ 实际 / ρ_ 纯甲醇 ()×100%), where ρ_ 实际 The actual density supplied for methanol, ρ_ 纯甲醇 The density of pure methanol is given. Therefore, by collecting the methanol density, the actual purity of the supplied methanol can be calculated. For every 5% decrease in methanol purity C, the core control unit 140 increases the target pressure P0 by 4% and the target flow rate Q0 by 3%. Thus, for every 5% decrease in methanol purity, the target pressure and target flow rate of the main unit 10 can be adjusted to ensure stable combustion efficiency of the main unit 10.

[0055] The control device also includes a safety protection unit 150, which is communicatively connected to the core control unit 140. The safety protection unit 150 includes an overpressure relief valve, a material shortage alarm module, and an emergency shut-off valve. The opening pressure of the overpressure relief valve is preferably 3.8 MPa. The response time of the emergency shut-off valve is preferably less than or equal to 50 ms.

[0056] The following example uses a 5000DWT dual-fuel marine main engine as an illustration of an application scenario.

[0057] The main engine of the 5000DWT dual-fuel ship has a rated power of 2000kW, a rated speed of 1500rpm, and a rated torque of 12732N・m. Storage tank 111 has a volume of 10m³. 3 The variable frequency booster pump 121 has a rated speed of 2900 rpm and a maximum head of 50 m. The electromagnetic proportional valve 122 has a nominal diameter of DN50. The speed sensor 131 has an accuracy of ±1 rpm. The torque sensor 132 has an accuracy of ±10 N·m. The flow sensor 124 has an accuracy of ±0.2%. The pressure sensor 123 has an accuracy of ±0.1%.

[0058] In the first operating condition, the main engine load increased from 20% (idle speed) to 100% (full load) in 10 seconds. The control device of this invention increases the methanol supply pressure from 0.5 MPa to 3.2 MPa and the flow rate from 80 L / h to 780 L / h in 85 ms, with the exhaust temperature of the main engine stabilizing at 680℃-720℃. However, the conventional control device takes 1.2 seconds to increase the methanol supply pressure to 3.2 MPa and 1.5 seconds to increase the flow rate to 780 L / h, with an exhaust temperature fluctuation range of 650℃-780℃.

[0059] In the second operating condition: the ambient temperature drops from 25°C to -5°C, and the purity of methanol fuel decreases from 99.9% to 85%. The control device of this invention automatically corrects the target pressure (from 3.2MPa to 3.5MPa) and target flow rate (from 780L / h to 820L / h), maintaining combustion efficiency above 92%. However, conventional control devices experience combustion efficiency drops below 85%, resulting in idling vibration.

[0060] The test results under the above two operating conditions show that, according to the control device of this application, the methanol fuel consumption rate is reduced by 10.5%, the pollutant emissions of the main unit are reduced by 18%, and the IMO Tier III emission standard is met.

[0061] The methanol supply skid adaptive pressure and flow control method and control device according to this application have the following advantages: a. High adjustment accuracy: Through load-parameter linkage control, the dynamic adjustment range of methanol supply pressure reaches 0.3MPa-3.5MPa, the flow rate adjustment range reaches 50L / h-800L / h, the pressure adjustment accuracy reaches ±0.05MPa, and the flow rate adjustment accuracy reaches ±2L / h, which is 40%-50% higher than the traditional solution.

[0062] b. Fast response speed: The adjustment response time is ≤100ms, which can solve the problem of parameter lag under different operating conditions of the host and avoid the risk of unstable idling or overpressure.

[0063] c. Strong adaptability: Through dynamic correction of environment and fuel quality, it can operate stably within the range of -10℃ to 40℃ and fuel purity of 85% to 99.9%, and its adaptability covers more than 90% of industrial and marine applications.

[0064] d. Energy saving and consumption reduction: Methanol fuel consumption rate is reduced by 8%-12%, while emissions of pollutants (NOx, VOCs) are reduced by 15%-20%, which meets the requirements of low-carbon policies.

[0065] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application.

[0066] The features described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless the feature is not applicable in that other embodiment or otherwise stated.

[0067] This application has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application.

Claims

1. A method for controlling the adaptive pressure and flow rate of a methanol supply skid, characterized in that, Includes the following steps: S10: Initialize parameters, Preload the "host load - methanol parameters" baseline mapping table; S20: Real-time data acquisition, At the first time interval, the rotational speed n and torque T of the host are collected, and at the second time interval, the actual pressure P and actual flow rate Q of the methanol supply are collected. S30: Dynamic deviation calculation Calculate the real-time load L of the host machine. Based on the real-time load L, compare it with the "host machine load - methanol parameters" benchmark mapping table to determine the current target pressure P0 and target flow rate Q0 of the methanol supply. Calculate the pressure deviation ΔP between the actual pressure P and the target pressure P0 of the methanol supply, and calculate the flow deviation ΔQ between the actual flow rate Q and the target flow rate Q0 of the methanol supply; S40: Adaptive output adjustment, where... If |ΔP|≤0.05MPa and |ΔQ|≤5L / h, maintain the current adjustment parameters. If |ΔP|>0.05MPa, the pressure and flow rate of the methanol supply will be adaptively adjusted. If |ΔQ|>5L / h, the flow rate of the methanol supply will be adaptively adjusted.

2. The method for controlling the adaptive pressure and flow rate of the methanol supply skid according to claim 1, characterized in that, The real-time load L = (T × n) / (T_max × n_max) × 100%, where T_max is the rated torque of the host and n is the rated speed of the host.

3. The method for controlling the adaptive pressure and flow rate of the methanol supply skid according to claim 1, characterized in that, S20 further includes: collecting the exhaust temperature T_exh of the host at each first time interval. The S60 further includes: if T_exh>750℃, then automatically reduce the flow rate of the methanol supply.

4. The method for controlling the adaptive pressure and flow rate of the methanol supply skid according to claim 1, characterized in that, S20 further includes: collecting the ambient temperature T_env every third time interval. The method for controlling the adaptive pressure and flow rate of the methanol supply skid also includes: S50: Dynamic correction and optimization The "host load - methanol parameter" baseline mapping table is revised at each of the third time intervals. For every 5°C decrease in ambient temperature T_env, the target pressure P0 increases by 3% and the target flow rate Q0 increases by 2%.

5. The method for controlling the adaptive pressure and flow rate of the methanol supply skid according to claim 4, characterized in that, S20 further includes: collecting the purity C of the methanol at each of the third time intervals. S50 further includes: for every 5% decrease in the purity C of the methanol, the target pressure P0 increases by 4% and the target flow rate Q0 increases by 3%.

6. The method for controlling the adaptive pressure and flow rate of the methanol supply skid according to claim 5, characterized in that, The step S20, which involves collecting the methanol purity C at each third time interval, includes: collecting the methanol density at each third time interval, wherein the methanol purity C = (ρ_ 实际 / ρ_ 纯甲醇 ()×100%), where ρ_ 实际 The actual density supplied for methanol, ρ_ 纯甲醇 This is the density of pure methanol.

7. The method for controlling the adaptive pressure and flow rate of the methanol supply skid according to any one of claims 4 to 6, characterized in that, The first time is 10ms, and / or The second time is 20ms, and / or The third time is 30 seconds.

8. A control device for executing the methanol supply skid adaptive pressure and flow control method according to any one of claims 1 to 7, characterized in that, The control device includes: A methanol storage unit, the methanol storage unit comprising a storage tank for storing methanol; The delivery regulating unit includes a variable frequency pressurizing pump, an electromagnetic proportional valve, a pressure sensor, and a flow sensor. The variable frequency pressurizing pump is used to deliver the methanol in the storage tank to the main unit. The electromagnetic proportional valve is used to regulate the flow rate of the methanol supply. The pressure sensor is used to measure the actual pressure of the methanol supply. The flow sensor is used to measure the actual flow rate of the methanol supply. A host load acquisition unit, comprising a speed sensor and a torque sensor, wherein the speed sensor measures the rotational speed of the host, and the torque sensor measures the torque of the host; and The core control unit is communicatively connected to both the conveying regulation unit and the main load acquisition unit to collect data measured by the flow sensor, the pressure sensor, the speed sensor, and the torque sensor. The core control unit possesses an adaptive control algorithm and a dynamic correction model, enabling it to calculate, based on the collected data, the pressure deviation ΔP between the actual methanol supply pressure P and the target pressure P0, and the flow deviation ΔQ between the actual methanol supply flow rate Q and the target flow rate Q0. Furthermore, based on the pressure deviation and the flow deviation, it adaptively outputs adjustment commands to the variable frequency booster pump and / or the electromagnetic proportional valve. If |ΔP|≤0.05MPa and |ΔQ|≤5L / h, maintain the current regulation command; If |ΔP|>0.05MPa, the speed of the variable frequency booster pump and the opening of the electromagnetic proportional valve are adaptively adjusted. If |ΔQ|>5L / h, the opening degree of the electromagnetic proportional valve is adaptively adjusted.

9. The control device according to claim 8, characterized in that, If |ΔP|>0.05MPa, the speed adjustment coefficient Kp of the variable frequency booster pump is ΔP / 0.1MPa, and the opening adjustment coefficient Kv of the electromagnetic proportional valve is ΔP / 0.2MPa; If |ΔQ|>5L / h, the opening adjustment coefficient of the electromagnetic proportional valve is Kq = ΔQ / 10L / h.

10. The control device according to claim 8, characterized in that, The host load acquisition unit further includes an exhaust temperature sensor and an ambient temperature sensor. The exhaust temperature sensor measures the exhaust temperature of the host, and the ambient temperature sensor measures the ambient temperature of the host. The delivery regulation unit further includes a density sensor, which measures the density of the methanol, and / or The control device also includes a safety protection unit, which is communicatively connected to the core control unit. The safety protection unit includes an overpressure relief valve, a material shortage alarm module, and an emergency shut-off valve.

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