A multi-mode fuel switching system and method for a dual-fuel trailing suction dredger

Abstract

The present application relates to the technical field of ship engineering, and provides a multi-mode fuel switching system and method for a dual-fuel drag suction dredger, which comprises a working condition monitoring module, an intelligent decision module and a fuel supply control module, and real-time acquisition of current working condition parameters of the drag suction dredger; determination of the current working condition of the dredger according to the current working condition parameters, supply of fuel to the engine according to a fuel supply mode from a pre-set fuel supply mode library; after the fuel supply mode is switched, the intelligent decision module continues to monitor the change of the working condition parameters in real time, and adjusts the related parameters in the fuel supply mode according to the pre-set fuel supply mode. By ensuring that the best fuel supply can be obtained under different working conditions, the engine performance decline and wear caused by improper fuel supply are avoided, and the service life of the engine is prolonged; the natural gas single fuel mode is used under the appropriate working condition, the pollutant emission is reduced, and the pollution to the marine environment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship engineering, and particularly relates to a multi-mode intelligent fuel switching system and method for a dual-fuel drag suction dredger. BACKGROUND

[0002] In the field of ocean engineering, the drag suction dredger, as an important dredging tool, its performance and safety are directly related to the efficiency of the project and environmental protection.

[0003] Liquefied natural gas (LNG) as a clean energy, its application in the ship power system has gradually become a trend, but the drag suction dredger needs to go through normal navigation, dredging, and mud throwing in the operation process, and the operating power of each process is significantly different. In actual work, the dredger may work at high power, and the power may change instantaneously. In order to meet the power requirements of the dredger, the existing fuel supply method sometimes causes excessive fuel combustion, resulting in a great waste of energy. Not only increases the operating cost, but also has a greater negative impact on the environment. Therefore, there is an urgent need for a technical solution that can accurately allocate the power and fuel energy of the drag suction dredger to improve energy utilization efficiency, reduce operating costs and environmental pollution. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a multi-mode fuel switching system for a dual-fuel drag suction dredger, comprising:

[0005] The working condition monitoring module comprises a navigation working condition monitoring unit, a dredging working condition monitoring unit and a mud throwing working condition monitoring unit; the navigation working condition monitoring unit is used for real-time monitoring and acquiring the navigation speed and the draft depth of the drag suction dredger; the dredging working condition monitoring unit is used for real-time monitoring the working state of the dredging equipment of the drag suction dredger, and acquiring the drag head depth, the mud pump flow and the dredging arm swing angle; the mud throwing working condition monitoring unit is used for monitoring the mud throwing distance and the mud throwing speed of the mud throwing equipment in the mud throwing process;

[0006] The intelligent decision-making module comprises a working condition recognition unit, a mode matching unit, a supply control unit and a fuel supply mode library; the working condition recognition unit analyzes and processes various working conditions collected by the working condition monitoring module, and accurately identifies the working condition type of the dredger; the mode matching unit matches the best fuel supply mode from the pre-set fuel supply mode library according to the identified working condition type, and the best fuel supply mode is the mode that requires the least fuel and natural gas under the premise of meeting the operating power requirements of the drag suction dredger; the supply control unit adjusts the natural gas flow, the fuel injection amount and the mixing ratio according to the real-time monitored working condition parameter changes after matching the best fuel supply mode;

[0007] The fuel supply control module comprises a natural gas supply unit, a fuel oil supply unit and a mode switching control unit; the natural gas supply unit comprises a natural gas storage tank, a natural gas injection valve and a natural gas delivery pipeline, and is used for supplying natural gas to the engine; the fuel oil supply unit comprises a fuel oil storage tank, a fuel oil injection valve and a fuel oil delivery pipeline, and is used for supplying fuel oil to the engine; the mode switching control unit is a core control unit of the fuel supply control module, receives information of the supply regulation unit, and controls working states of the natural gas supply unit and the fuel oil supply unit according to a preset fuel supply mode, so as to realize automatic switching of the fuel supply mode and adjustment of the mixing ratio, and control valve opening degrees and injection times of the natural gas and fuel oil supply systems.

[0008] Further, the working condition types of the cutter suction dredger include a navigation working condition, a dredging working condition and a mud throwing working condition; the navigation working condition refers to a state when the cutter suction dredger has a speed greater than 5 kn, the dredging equipment is not working and the load is low; the dredging working condition refers to a process that the cutter head of the dredger performs dredging operation on the seabed and the mixture of mud and water is sucked into the mud tank through the cutter head; the ship in the dredging working condition has a low speed (usually 2-4 kn) and the dredging equipment is always working; the mud throwing working condition refers to a process that the cutter suction dredger reaches the mud throwing site and discharges the mud in the mud tank.

[0009] Further, the preset fuel supply mode library stores corresponding fuel supply modes and parameter settings in different working conditions, such as natural gas single fuel mode parameters (natural gas flow range, injection time, etc.) corresponding to various speeds and draughts in the navigation working condition, natural gas and fuel oil mixed supply mode parameters (mixed ratio range, dynamic adjustment strategy, etc.) corresponding to various cutter head depths, mud pump flow and dredging arm swing angles in the dredging working condition;

[0010] When the intelligent decision module receives that the speed of the cutter suction dredger is greater than 5 kn and the dredging equipment and the mud throwing equipment are not working (no data related to the dredging equipment and the mud throwing equipment), it is determined that the cutter suction dredger is in the navigation working condition, the intelligent decision module matches the single natural gas fuel supply mode according to the speed and draught of the cutter suction dredger, obtains the natural gas flow setting in the mode, and controls the fuel supply by the mode switching control unit;

[0011] When the intelligent decision module receives the speed of the cutter suction dredger between 2-4 kn and the dredging equipment is working, and the sludge throwing equipment is not working (with dredging equipment and without sludge throwing equipment related data), it determines that the current working condition of the cutter suction dredger is the dredging working condition. The intelligent decision module matches the natural gas and fuel mixed supply mode according to the working state of the dredging equipment (such as the depth of the cutter head, the flow of the sludge pump, the swing angle of the dredging arm), obtains the initial value of the mixing ratio, the fuel and natural gas flow and the dynamic adjustment strategy in this mode, and controls the fuel supply by the mode switching control unit. The dynamic adjustment strategy is usually to adjust the fuel supply according to the change of power demand under different working conditions. For example, when the parameters such as the flow of the sludge pump change, resulting in the change of power demand, the supply control unit will adjust the fuel supply according to the power-fuel mixing ratio mapping table and the calculation formula of the actual power demand of the engine. Specifically, when the power demand increases, such as the flow of the sludge pump increases from 100 cubic meters / hour to 120 cubic meters / hour, the supply control unit will increase the fuel injection amount according to a certain proportion, and at the same time, it will fine-tune the natural gas flow, so that the mixing ratio deviates towards the fuel direction. The corresponding relationship between power change and fuel adjustment is obtained through a large number of experiments and actual operation data optimization, for example, for every 10% increase in power, the fuel injection amount increases by x%, and the natural gas flow adjusts by y%. At the same time, factors such as the efficiency characteristics of the engine, emission requirements, etc. are also considered to formulate the dynamic adjustment strategy comprehensively.

[0012] When the intelligent decision module receives that the dredging equipment of the cutter suction dredger is not working and the sludge throwing equipment is working (with dredging equipment and without sludge throwing equipment related data), it determines that the current working condition of the cutter suction dredger is the sludge throwing working condition. The intelligent decision module matches the natural gas and fuel mixed supply mode according to the sludge throwing distance and speed of the sludge throwing operation, obtains the initial value of the mixing ratio, the fuel and natural gas flow and the dynamic adjustment strategy in this mode, and controls the fuel supply by the mode switching control unit.

[0013] Further, the fuel supply mode library is based on the ship speed, the ship draft, the dredging cutter head depth, the sludge pump flow, the sludge throwing distance, the sludge throwing speed and the actual power demand of the engine of the dredger calculated by the other running equipment of the ship, combined with the actual power demand of the engine, to establish a power-fuel mixing ratio mapping table. The other running equipment of the ship includes the lighting system, the ventilation system, the communication and navigation equipment, the life facility related equipment (such as air conditioner, fresh water supply equipment, etc.), the other auxiliary equipment (such as the cooling equipment of the generator, the power distribution cabinet, etc.) in the ship power system. These devices need to consume a certain amount of power during the operation of the ship, so their power consumption needs to be considered when calculating the actual demand power of the engine per hour. The fuel supply mode library is formed by a plurality of working conditions, wherein,

[0014] The actual demand power P(w) of the engine per hour is:

[0015] P(w) = P(v, d) + P(h, q, a) + P(l, s) + P0;

[0016] Wherein, v represents the speed data, d represents the draft data, h represents the dredging rake head depth data, q represents the mud pump flow data, a represents the dredging arm swing angle, l represents the mud throwing distance data, s represents the mud throwing speed data, P0 is the operating power of other equipment of the cutter suction dredger;

[0017] When the cutter suction dredger is in the navigation working condition, P(h, q, a) and P(l, s) are 0; when the cutter suction dredger is in the dredging working condition, P(l, s) is 0; when the cutter suction dredger is in the mud throwing working condition, P(h, q, a) is 0;

[0018] The actual energy E(J) produced per second by the fuel burning is:

[0019] E(J) = E(x) + E(y);

[0020] E(x) is the energy produced by natural gas burning, and E(y) is the energy produced by fuel oil burning. When natural gas is used as the single fuel supply of the dredger, E(y) = 0;

[0021] When the relationship between the actual demand power of the engine per hour and the actual energy produced per second by the fuel burning satisfies P(W) = E(J) / 3600, the fuel mixing ratio in the current working state is determined, the fuel supply mode in the working state is obtained, the fuel supply mode of the cutter suction dredger in the working state is simulated, and it is verified whether the fuel supply mode can meet the power requirement of the ship.

[0022] Further, the mode switching control unit adopts a closed-loop control strategy when controlling the fuel supply, adjusts the fuel supply in real time by monitoring the fuel flow and the speed and power of the engine, and ensures that the engine can operate stably under various working conditions; if it is found that the actual demand power of the engine does not reach the expected value, the supply amount of natural gas or fuel oil is increased as needed according to the current fuel supply mode.

[0023] Further, the intelligent fuel switching system has self-learning and optimization capabilities, continuously collects operation data, analyzes fuel consumption efficiency, emission conditions and equipment wear conditions, and continuously optimizes the fuel supply mode. More accurate working condition matching and the highest energy utilization efficiency are achieved.

[0024] The fuel switching system further comprises an optimization module for analyzing fuel consumption efficiency, emission conditions and equipment wear conditions, optimizing the fuel supply mode,

[0025] Specific implementation steps: during the long-term operation of the dredger, the optimization module continuously collects operation data, including fuel consumption efficiency, emission conditions and equipment wear condition under different working conditions, for example, after a period of data collection and analysis, it is found that under a certain dredging working condition, although the original fuel supply mode can meet the power demand, the fuel consumption is high and the emission is over standard. By analyzing these data, the parameters in the power-fuel mixing ratio mapping table are adjusted, and the fuel supply mode under this working condition is optimized to make the fuel mixing ratio more reasonable. After multiple optimizations, more accurate working condition matching is realized, energy utilization efficiency is improved, fuel consumption and emissions are reduced.

[0026] The application also provides a multi-mode fuel switching method for a dual-fuel drag suction dredger, comprising the following steps:

[0027] Step one: during the operation of the drag suction dredger, the working condition monitoring module collects the sailing speed, draft depth, and rake head depth of the drag suction dredger in real time, as well as the pump flow, dredging arm swing angle, and throwing distance and speed of the throwing equipment, and transmits the collected data to the working condition identification unit;

[0028] Step two: the working condition identification unit analyzes and processes the collected working condition parameters to identify the current working condition of the drag suction dredger;

[0029] Step three: the mode matching unit matches the best fuel supply mode from the pre-set fuel supply mode library according to the working condition type identified by the working condition identification unit, and obtains the natural gas flow, fuel injection amount, and mixing ratio under this mode;

[0030] Step four: the mode switching control unit of the fuel supply control module controls the working state of the natural gas supply unit and the fuel supply unit according to the mode information and parameter settings provided by the mode matching unit, realizes automatic switching of the fuel supply mode and adjustment of the mixing ratio, and controls the valve opening degree and injection time of the natural gas and fuel supply systems;

[0031] Step five: after the fuel supply mode is switched, the supply control unit of the intelligent decision-making module continues to monitor the changes of the working condition parameters in real time, and adjusts the related parameters in the fuel supply mode according to the pre-set fuel supply mode.

[0032] The application has the following beneficial effects:

[0033] First, improve fuel utilization efficiency: by adjusting the fuel supply mode, accurately control the fuel supply according to different working conditions and power demand, reduce fuel waste, improve energy utilization efficiency, and reduce operating costs.

[0034] Second, optimize engine performance: ensure that the engine receives the best fuel supply under different operating conditions, avoid engine performance degradation and wear caused by improper fuel supply, and extend engine life.

[0035] Third, enhance environmental performance: using natural gas as the sole fuel under suitable operating conditions reduces pollutant emissions, meets environmental protection requirements, and reduces pollution to the marine environment.

[0036] Fourth, improve the reliability and adaptability of ship operation: It can flexibly adjust the fuel supply according to the real-time status of the ship and changes in the environment, improve the reliability and adaptability of the ship under different operating conditions, and reduce human error. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the fuel switching system in Example 1.

[0038] Figure 2 This is a flowchart illustrating the implementation of the fuel switching system in Example 1.

[0039] Figure 3 This is a flowchart of the fuel supply mode library construction process in Example 1.

[0040] Figure 4 This is a flowchart of the fuel switching process in Example 2.

[0041] The system comprises: 1. Operating condition monitoring module; 2. Intelligent decision-making module; 3. Fuel supply control module; 4. Engine; 1-1. Navigation operating condition monitoring unit; 1-2. Dredging operating condition monitoring unit; 1-3. Dredging operating condition monitoring unit; 2-1. Operating condition identification unit; 2-2. Mode matching unit; 2-3. Supply control unit; 2-4. Preset fuel supply mode library; 3-1. Natural gas supply unit; 3-2. Mode switching control unit; 3-3. Fuel supply unit; 3-4. Gas storage tank; 3-5. Natural gas injection valve; 3-6. Natural gas transmission pipeline; 3-7. Oil storage tank; 3-8. Fuel injection valve; 3-9. Fuel transmission pipeline. Detailed Implementation

[0042] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. However, these embodiments are not intended to limit the present invention. Any similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all indicate the relationship between and. The English letters in the present invention are case-sensitive.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment provides a multi-mode fuel switching system for a dual-fuel trailing suction hopper dredger, including:

[0045] The working condition monitoring module 1 comprises a navigation working condition monitoring unit 1-1, a dredging working condition monitoring unit 1-2 and a mud throwing working condition monitoring unit 1-3; the navigation working condition monitoring unit 1-1 is used for monitoring and acquiring the navigation speed and the draft of the cutter suction dredger in real time; the dredging working condition monitoring unit 1-2 is used for monitoring the working state of the dredging equipment of the cutter suction dredger and acquiring the depth of the cutter head, the flow of the mud pump and the swing angle of the dredging arm; the mud throwing working condition monitoring unit 1-3 is used for monitoring the throwing distance and the throwing speed of the mud throwing equipment in the mud throwing process; wherein, the working condition types of the cutter suction dredger include the navigation working condition, the dredging working condition and the mud throwing working condition; the navigation working condition refers to the state when the navigation speed of the cutter suction dredger is greater than 5 kn, the dredging equipment is not working and the load is low; the dredging working condition refers to the process that the cutter head of the dredger performs the dredging operation on the seabed and the mixture of mud and water is sucked into the mud tank through the cutter head; the navigation speed of the ship in the dredging working condition is low (usually 2-4 kn) and the dredging equipment is always in the working state; the mud throwing working condition refers to the process that the mud in the mud tank is discharged after the cutter suction dredger reaches the mud throwing site.

[0046] The intelligent decision-making module 2 comprises a working condition recognition unit 2-1, a mode matching unit 2-2, a supply regulation unit 2-3 and a fuel supply mode library 2-4; the working condition recognition unit 2-1 analyzes and processes various working conditions collected by the working condition monitoring module, accurately recognizes the working condition type of the cutter suction dredger at present; the mode matching unit 2-2 matches the best fuel supply mode from the preset fuel supply mode library 2-4 according to the recognized working condition type; the best fuel supply mode is the mode in which the least fuel oil and natural gas are required under the premise of meeting the operating power requirement of the cutter suction dredger; the supply regulation unit 2-3 adjusts the natural gas flow, the fuel injection amount and the mixing ratio according to the real-time monitored working condition parameter changes after the best fuel supply mode is matched;

[0047] The preset fuel supply mode library 2-4 stores the corresponding fuel supply modes and parameter settings under different working conditions, such as the natural gas single fuel mode parameters (natural gas flow range, injection time, etc.) corresponding to various navigation speeds and drafts under the navigation working condition, the natural gas and fuel mixed supply mode parameters (mixed ratio range, dynamic adjustment strategy, etc.) corresponding to various cutter head depths, mud pump flows and dredging arm swing angles under the dredging working condition;

[0048] As Figure 2As shown, when the intelligent decision module 2 receives parameters that the speed of the cutter suction dredger is greater than 5 kn and the dredging equipment and the sludge throwing equipment are not working (no data related to the dredging equipment and the sludge throwing equipment), it is determined that the current working condition of the cutter suction dredger is the navigation working condition, the intelligent decision module 2 matches a single natural gas fuel supply mode according to the speed and draft of the cutter suction dredger, and obtains the natural gas flow setting in the mode, and the fuel supply is controlled by the mode switching control unit 3-2.

[0049] When the intelligent decision module 2 receives parameters that the speed of the cutter suction dredger is 2-4 kn and the dredging equipment is working and the sludge throwing equipment is not working (there is data related to the dredging equipment and no data related to the sludge throwing equipment), it is determined that the current working condition of the cutter suction dredger is the dredging working condition, the intelligent decision module 2 matches a natural gas and fuel mixed supply mode according to the working state of the dredging equipment (such as the depth of the cutter head, the flow of the sludge pump, and the swing angle of the dredging arm), obtains the initial value of the mixing ratio, the flow of fuel and natural gas, and the dynamic adjustment strategy in the mode, and controls the fuel supply by the mode switching control unit 3-2. The dynamic adjustment strategy is usually to adjust the fuel supply according to the change of power demand in different working conditions, for example, when the parameters such as the flow of the sludge pump change and cause the power demand to change, the supply control unit will adjust the fuel supply according to the power-fuel mixing ratio mapping table and the calculation formula of the actual power demand of the engine; specifically, when the power demand increases, such as the flow of the sludge pump increases from 100 cubic meters / hour to 120 cubic meters / hour, the supply control unit will increase the fuel injection amount by a certain proportion, and at the same time, the natural gas flow will be adjusted slightly, so that the mixing ratio deviates towards the fuel direction. The corresponding relationship between power change and fuel adjustment is obtained through a large number of experiments and actual operation data optimization, for example, for every 10% increase in power, the fuel injection amount increases by x%, and the natural gas flow adjusts by y%. At the same time, factors such as the efficiency characteristics of the engine and emission requirements are also considered to formulate the dynamic adjustment strategy comprehensively.

[0050] When the intelligent decision module 2 receives parameters that the dredging equipment of the cutter suction dredger is not working and the sludge throwing equipment is working (there is data related to the sludge throwing equipment and no data related to the dredging equipment), it is determined that the current working condition of the cutter suction dredger is the sludge throwing working condition, the intelligent decision module 2 matches a natural gas and fuel mixed supply mode according to the sludge throwing distance and speed of the sludge throwing operation, obtains the initial value of the mixing ratio, the flow of fuel and natural gas, and the dynamic adjustment strategy in the mode, and controls the fuel supply by the mode switching control unit 3-2.

[0051] For example, Figure 3As shown, the fuel supply mode library 2-4 is based on the ship speed, ship draft, dredging rake depth, mud pump flow, mud throwing distance, mud throwing speed and other running equipment of the ship to calculate the actual power demand of the engine of the dredger, combined with the actual power demand of the engine, to establish a power-fuel mixture ratio mapping table, wherein the other running equipment of the ship includes the lighting system, ventilation system, communication and navigation equipment, life facility related equipment (such as air conditioner, fresh water supply equipment, etc.), other auxiliary equipment (such as cooling equipment of generator, power distribution cabinet, etc.) in the ship power system, which all need to consume a certain power during the operation of the ship, so the power consumption of them needs to be considered when calculating the actual demand power of the engine per hour, and the fuel supply mode under multiple working conditions is combined to form the fuel supply mode library, wherein,

[0052] The actual demand power of the engine per hour P(w) is:

[0053] P(w)=P(v,d)+P(h,q,a)+P(l,s)+P0;

[0054] Wherein, v represents the speed data, d represents the draft data, h represents the dredging rake depth data, q represents the mud pump flow data, a represents the dredging arm swing angle, l represents the mud throwing distance data, s represents the mud throwing speed data, and P0 is the running power of other equipment of the rake suction dredger;

[0055] When the rake suction dredger is in the navigation working condition, P(h,q,a) and P(l,s) are 0; when the rake suction dredger is in the dredging working condition, P(l,s) is 0; when the rake suction dredger is in the mud throwing working condition, P(h,q,a) is 0;

[0056] The actual energy produced per second by fuel combustion E(J) is:

[0057] E(J)=E(x)+E(y);

[0058] E(x) is the energy produced by natural gas combustion, and E(y) is the energy produced by fuel oil combustion, when natural gas is used as the single fuel supply of the dredger, E(y)=0;

[0059] When the relationship between the actual demand power of the engine per hour and the actual energy produced per second by fuel combustion satisfies P(W)=E(J) / 3600, the fuel mixture ratio under the current working condition is determined, the fuel supply mode under the working condition is obtained, the fuel supply mode of the rake suction dredger under the working condition is simulated, and whether the fuel supply mode can meet the power requirement of the ship is verified.

[0060] The fuel supply control module 3 includes a natural gas supply unit 3-1, a fuel oil supply unit 3-3, and a mode switching control unit 3-2; the natural gas supply unit 3-1 includes a natural gas storage tank 3-4, a natural gas injection valve 3-5, and a natural gas delivery pipeline 3-6 for supplying natural gas to the engine 4; the fuel oil supply unit 3-3 includes a fuel oil storage tank 3-7, a fuel oil injection valve 3-8, and a fuel oil delivery pipeline 3-9 for supplying fuel oil to the engine 4; the mode switching control unit 3-2 is the core control unit of the fuel supply control module, receives information from the supply regulation unit 2-3, and controls the working state of the natural gas supply unit and the fuel oil supply unit according to the preset fuel supply mode, realizes automatic switching of the fuel supply mode and adjustment of the mixing ratio, and controls the valve opening degree and injection time of the natural gas and fuel oil supply systems.

[0061] The mode switching control unit 3-2 adopts a closed-loop control strategy when controlling fuel supply, adjusts the fuel supply in real time by monitoring the fuel flow and the speed and power of the engine, and ensures that the engine can operate stably under various working conditions; if it is found that the actual demand power of the engine does not reach the expected value, the supply amount of natural gas or fuel oil is increased as needed according to the current fuel supply mode.

[0062] Preferably, the intelligent fuel switching system has self-learning and optimization capabilities, continuously collects operation data, analyzes fuel consumption efficiency, emission conditions, and equipment wear conditions, and continuously optimizes the fuel supply mode. More accurate working condition matching and the highest energy utilization efficiency are realized. The fuel switching system further includes an optimization module for analyzing fuel consumption efficiency, emission conditions, and equipment wear conditions, optimizing the fuel supply mode, and the specific execution steps are as follows:

[0063] During the long-term operation of the dredger, the optimization module continuously collects operation data, including fuel consumption efficiency, emission conditions, and equipment wear conditions under different working conditions. For example, after a period of data collection and analysis, it is found that under a certain dredging working condition, although the original fuel supply mode can meet the power demand, the fuel consumption is high and the emission exceeds the standard. By analyzing these data, the parameters in the power-fuel mixing ratio mapping table are adjusted, and the fuel supply mode under this working condition is optimized to make the fuel mixing ratio more reasonable. After multiple optimizations, more accurate working condition matching is realized, the energy utilization efficiency is improved, and the fuel consumption and emissions are reduced.

[0064] Embodiment 2

[0065] As shown in Figure 4 The embodiment provides a multi-mode fuel switching method for a dual-fuel drag suction dredger, which includes the following steps:

[0066] The working condition monitoring step is used for acquiring the current working condition parameters of the cutter suction dredger in real time, specifically, the working condition monitoring module 1 collects the sailing speed, the water depth, the rake head depth, the mud pump flow, the dredging arm swing angle, the mud throwing distance and the mud throwing speed of the current cutter suction dredger in the running project in real time, and transmits the collected data to the working condition identification unit 2-1;

[0067] The working condition identification step is used for determining the current working condition of the dredger according to the current working condition parameters, specifically, the working condition identification unit 2-1 analyzes and processes the collected working condition parameters to identify the current working condition of the cutter suction dredger;

[0068] The working condition matching step is used for matching the best fuel supply mode from the preset fuel supply mode library 2-4 according to the identification result, specifically, the mode matching unit 2-3 matches the best fuel supply mode from the preset fuel supply mode library 2-4 according to the working condition type identified by the working condition identification unit 2-1, and obtains the natural gas flow, the fuel injection amount and the mixing ratio in the mode;

[0069] The fuel supply step is used for supplying fuel to the engine according to the fuel supply mode, specifically, the mode switching control unit 3-2 of the fuel supply control module 3 controls the working states of the natural gas supply unit 3-1 and the fuel supply unit 3-2 according to the mode information and the parameter setting provided by the mode matching unit 2-2, so as to realize the automatic switching of the fuel supply mode, the adjustment of the mixing ratio, the control of the valve opening degree and the injection time of the natural gas and fuel supply systems;

[0070] After the fuel supply mode is switched, the supply control unit 2-3 of the intelligent decision module 2 continues to monitor the change of the working condition parameters in real time, and adjusts the related parameters in the fuel supply mode according to the preset fuel supply mode.

[0071] The present application can ensure that the engine can obtain the best fuel supply in different working states, avoid the performance decline and wear of the engine caused by improper fuel supply, prolong the service life of the engine, use the natural gas single fuel mode in the appropriate working state, reduce the pollutant emission, meet the environmental protection requirements and reduce the pollution to the marine environment.

[0072] It should be noted that the above only describes the preferred embodiments of the present application, and does not limit the present application in any form. The technical features or combinations of technical features described in the embodiments of the present application should not be considered isolated, and they can be combined with each other to achieve better technical effects. The known technologies, methods and devices for ordinary skilled in the related art are not discussed in detail, but in appropriate cases, the said technologies, methods and devices should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as only exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments are within the scope of the technical scheme of the present application.

Claims

1. A multi-mode fuel switching system for a dual fuel trailing suction dredger, characterized in that, The method comprises the following steps: The working condition monitoring module (1) comprises a navigation working condition monitoring unit (1-1), a dredging working condition monitoring unit (1-2) and a mud throwing working condition monitoring unit (1-3); the navigation working condition monitoring unit (1-1) is used for monitoring and acquiring the navigation speed and the draft of the cutter suction dredger in real time; the dredging working condition monitoring unit (1-2) is used for monitoring the working state of the dredging equipment of the cutter suction dredger in real time, and acquiring the depth of the cutter head, the flow of the mud pump and the swing angle of the dredging arm; the mud throwing working condition monitoring unit (1-3) is used for monitoring the throwing distance and the throwing speed of the mud throwing equipment during the mud throwing process; The intelligent decision module (2) comprises a working condition recognition unit (2-1), a mode matching unit (2-2), a supply control unit (2-3) and a fuel supply mode library (2-4); the working condition recognition unit (2-1) analyzes and processes various working conditions collected by the working condition monitoring module, and accurately identifies the type of the current working condition of the dredger; the mode matching unit (2-2) matches the best fuel supply mode from the preset fuel supply mode library (2-4) according to the identified working condition type; the supply control unit (2-3) adjusts the natural gas flow, the fuel injection amount and the mixing ratio according to the real-time monitored working condition parameter changes after the best fuel supply mode is matched; The fuel supply control module (3) comprises a natural gas supply unit (3-1), a fuel supply unit (3-3) and a mode switching control unit (3-2); the natural gas supply unit (3-1) is used for supplying natural gas to the engine (4); the fuel supply unit (3-3) is used for supplying fuel to the engine (4); the mode switching control unit (3-2) is the core control unit of the fuel supply control module, receives the information of the supply control unit (2-3), and controls the working state of the natural gas supply unit and the fuel supply unit according to the preset fuel supply mode, so as to realize the automatic switching of the fuel supply mode and the adjustment of the mixing ratio, and control the valve opening degree and the injection time of the natural gas and fuel supply systems.

2. A dual fuel trailing suction dredger multi-mode fuel switching system according to claim 1, characterized in that, The working condition type of the cutter suction dredger is divided into navigation working condition, dredging working condition and mud throwing working condition.

3. A dual fuel trailing suction dredger multi-mode fuel switching system according to claim 2, characterized in that, When the intelligent decision module (2) receives that the navigation speed of the cutter suction dredger is greater than 5 kn and the dredging equipment and the mud throwing equipment are not working, it is determined that the current working condition of the cutter suction dredger is the navigation working condition, the intelligent decision module (2) matches a single natural gas fuel supply mode according to the navigation speed and the draft of the cutter suction dredger, and obtains the natural gas flow setting under the mode, and the fuel supply is controlled by the mode switching control unit (3-2); When the intelligent decision module (2) receives that the navigation speed of the cutter suction dredger is between 2 kn and 4 kn and the dredging equipment is working and the mud throwing equipment is not working, it is determined that the current working condition of the cutter suction dredger is the dredging working condition, the intelligent decision module (2) matches a natural gas and fuel mixed supply mode according to the working state of the dredging equipment, and obtains the initial value of the mixing ratio, the fuel and natural gas flow and the dynamic adjustment strategy under the mode, and the fuel supply is controlled by the mode switching control unit (3-2). When the intelligent decision module (2) receives that the dredging equipment of the cutter suction dredger is not working and the sludge throwing equipment is working, it is determined that the current working condition of the cutter suction dredger is the sludge throwing working condition, the intelligent decision module (2) matches the natural gas and fuel mixed supply mode according to the sludge throwing distance and the sludge throwing speed of the sludge throwing operation, and obtains the initial value of the mixed ratio, the fuel and natural gas flow and the dynamic adjustment strategy in the mode, and the fuel supply is controlled by the mode switching control unit (3-2).

4. A dual fuel trailing suction dredger multi-mode fuel switching system according to claim 1, characterized in that, The fuel supply mode library (2-4) is based on the ship speed, the ship draft, the dredging bucket depth, the sludge pump flow, the sludge throwing distance, the sludge throwing speed and other running equipment of the ship to calculate the actual power demand of the engine of the dredger, and a power-fuel mixed ratio mapping table is established in combination with the actual power demand of the engine, and the fuel supply mode under multiple working conditions is combined to form the fuel supply mode library, wherein, Engine actual demand power per hour P(w) Is: ； wherein, v represents the speed data, d represents the draft data, h represents the dredging bucket depth data, q represents the dredge pump flow data, a represents the dredging arm swing angle, l represents the throwing distance data, s represents the throwing speed data, is the power of other equipment of the dredging cutter suction dredger; When the cutter suction dredger is in the sailing condition, 、 are 0; when the cutter suction dredger is in the dredging condition, is 0; when the cutter suction dredger is in the dumping condition, is 0; The fuel actually produces energy per second E(J) Is: ； energy produced by burning natural gas, energy produced by burning fuel oil, when natural gas is supplied as the single fuel for the dredger, = 0 ; The relationship between the actual demand power of the engine per hour and the actual generated energy of the fuel burned per second satisfies P(W)= E(J) / 3600 When the current working state is determined, the fuel mixing ratio in the current working state is determined, the fuel supply mode in the current working state is obtained, the fuel supply mode of the drag suction dredger in the current working state is simulated, and it is verified whether the fuel supply mode can meet the power requirement of the ship.

5. A dual fuel trailing suction dredger multi-mode fuel switching system according to claim 1, characterized in that, The mode switching control unit (3-2) adopts a closed-loop control strategy when controlling the fuel supply, and adjusts the fuel supply in real time by monitoring the fuel flow and the speed and power of the engine, so that the engine can stably operate under various working conditions; if it is found that the actual demand power of the engine does not reach the expected value, the supply amount of natural gas or fuel is increased as needed according to the current fuel supply mode.

6. A dual fuel trailing suction dredger multi-mode fuel switching system according to claim 1, characterized in that, The fuel switching system further comprises an optimization module for analyzing fuel consumption efficiency, emission and equipment wear condition, and optimizing the fuel supply mode, The specific execution steps are as follows: during the long-term operation of the dredger, the optimization module continuously collects operation data including fuel consumption efficiency, emission and equipment wear condition under different working conditions, adjusts the parameters in the power-fuel mixed ratio mapping table by analyzing these data, and optimizes the fuel supply mode under the working condition to make the fuel mixed ratio more reasonable; after multiple optimizations, more accurate working condition matching is realized, the energy utilization efficiency is improved, and the fuel consumption and emission are reduced.

7. A method of multi-mode fuel switching for a dual-fuel trailing suction dredger, characterized in that, The multi-mode fuel switching method is suitable for the multi-mode fuel switching system of any one of claims 1-6, and the multi-mode fuel switching method comprises the following steps: Step one: during the operation of the cutter suction dredger, the working condition monitoring module collects the sailing speed, draft depth and bucket depth, sludge pump flow, dredging arm swing angle, sludge throwing distance and sludge throwing speed of the current cutter suction dredger in real time, and transmits the collected data to the working condition identification unit; Step two: the working condition identification unit analyzes and processes the collected working condition parameters to identify the current working condition of the cutter suction dredger; Step three: the mode matching unit matches the best fuel supply mode from the preset fuel supply mode library according to the working condition type identified by the working condition identification unit, and obtains the natural gas flow, fuel injection amount and mixed ratio under the mode; Step four: the mode switching control unit of the fuel supply control module controls the working state of the natural gas supply unit and the fuel supply unit according to the mode information and parameter settings provided by the mode matching unit. Step five, after the fuel supply mode is switched, the supply regulation unit of the intelligent decision module continues to monitor the change of the working condition parameters in real time, and adjusts the related parameters in the fuel supply mode according to the preset fuel supply mode.

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