A control method for a marine generator set

Abstract

The application discloses a kind of offshore generator set control method, first obtain diesel engine high temperature water inlet temperature, low temperature water outlet temperature, generator low temperature water inlet temperature and generator low temperature water outlet temperature;Judge whether diesel engine high temperature water inlet temperature is greater than preset maximum value;Judge whether low temperature water outlet temperature is greater than preset diesel engine temperature threshold;Judge whether generator low temperature water inlet temperature is in preset first temperature range;Judge whether generator low temperature water outlet temperature is greater than preset generator temperature threshold;According to the result of judging, check unit, diesel engine, generator and cooling system, to exclude fault.It can be seen that, by real-time monitoring water temperature in different positions, whether unit, diesel engine and generator exist fault can be found, so as to timely carry out fault elimination, improve operation reliability;And the offshore generator set involved in the application has high integration, greatly reduces the internal parts and pipeline of cabin, reduces internal arrangement space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine generator set, in particular to a control method of marine generator set. BACKGROUND

[0002] The existing domestic 1200-1500kW generator set often adopts a large-bore diesel engine, and the main components such as low-temperature water pump, sea fresh water cooler, machine cooler and coarse filter are basically installed and arranged in the cabin, and the detection of the relevant data of the diesel engine and generator is realized through the newly added mechanical table or sensor measuring point of the pipeline. At the same time, through the ship energy management system, the oil pump of the generator oil-water cooler and the electric sewage pump are controlled, and a separate control strategy is needed to realize the cooperative control with the operating state of the unit, and the winding temperature, bearing temperature, intake and exhaust temperature and voltage of the generator are monitored through the energy management system.

[0003] For the mobile platform environment at sea, the existing unit often has the problems of large size, low product integration, and the use of peripheral equipment such as water pump, regulating valve, filter and cooler provided by the shipyard to meet the cooling system demand, which occupies a large space inside the cabin; difficult data monitoring and management and low automation level, the unit data is monitored and managed through the newly added mechanical table or various sensors, a separate control strategy is needed to realize the cooperative control of the water-cooled generator and the engine, the system is relatively complex, the use and maintenance cost is high in later period; the whole unit has high energy consumption, needs manual operation and has many point inspection parts, the pipeline and components of the whole machine have poor corrosion resistance, and the economy and reliability of the product are not high. SUMMARY

[0004] In view of the above problems, the technical problem to be solved by the present application is to provide a control method of marine generator set, which adopts a double-closed cooling system to realize high and low temperature fresh water closed circulation to improve reliability, realize the high integration of coarse filter, central cooler, low temperature water pump and monitoring system and other components, realize double monitoring of diesel engine and generator data through self-control unit and self-monitoring system, and complete efficient communication and monitoring management between marine monitoring and unit.

[0005] To solve the above technical problems, the technical scheme of the present application is:

[0006] A control method of marine generator set, the marine generator set comprising a common base, the common base being provided with a diesel engine, a generator and a cooling system respectively;

[0007] The control method comprises the following steps:

[0008] S1, obtaining diesel engine high-temperature water inlet temperature T1, low-temperature water outlet temperature T2, generator low-temperature water inlet temperature T3 and generator low-temperature water outlet temperature T4;

[0009] S2, judging whether the high-temperature water inlet temperature T1 of the diesel engine is greater than a preset maximum temperature Tmax;

[0010] If the high-temperature water inlet temperature T1 of the diesel engine is greater than the preset maximum temperature Tmax, a corresponding unit overheating check signal is generated;

[0011] judging whether the low-temperature water outlet temperature T2 is greater than a preset diesel engine temperature threshold;

[0012] If the low-temperature water outlet temperature T2 is greater than the preset diesel engine temperature threshold, a corresponding diesel engine fault check signal is generated;

[0013] judging whether the low-temperature water inlet temperature T3 of the generator is within a preset first temperature range;

[0014] If the low-temperature water inlet temperature T3 of the generator is not within the preset first temperature range, a corresponding cooling system fault check signal is generated;

[0015] judging whether the low-temperature water outlet temperature T4 of the generator is greater than a preset generator temperature threshold;

[0016] If the low-temperature water outlet temperature T4 of the generator is greater than the preset generator temperature threshold, a corresponding generator fault check signal is generated;

[0017] S3, according to the unit overheating check signal, a corresponding prompt is issued and it is checked whether the marine generator unit has a fault; according to the diesel engine fault check signal, a corresponding prompt is issued and it is checked whether the diesel engine has a fault; according to the cooling system fault check signal, a corresponding prompt is issued and it is checked whether the cooling system has a fault; according to the generator fault check signal, a corresponding prompt is issued and it is checked whether the generator has a fault.

[0018] Preferably, the S1 further comprises: obtaining the fuel temperature, the fuel pressure difference and the oil pressure difference of the diesel engine;

[0019] The S2 further comprises: judging whether the fuel temperature is within a preset fuel temperature range;

[0020] If the fuel temperature is not within the preset fuel temperature range, a corresponding diesel engine alarm signal is generated;

[0021] judging whether the fuel pressure difference is within a preset fuel pressure difference range;

[0022] If the fuel pressure difference is not within the preset fuel pressure difference range, a corresponding diesel engine alarm signal is generated;

[0023] judging whether the oil pressure difference is within a preset oil pressure difference range;

[0024] If the engine oil pressure difference is not within the preset engine oil pressure difference range, a corresponding engine alarm signal is generated;

[0025] The S3 further comprises: according to the engine alarm signal, triggering an alarm and transmitting the fuel temperature, the fuel pressure difference and the engine oil pressure difference to the ship control unit.

[0026] Preferably, the S1 further comprises: obtaining the generator winding temperature, the bearing temperature, the generator voltage and the generator current;

[0027] The S2 further comprises: judging whether the generator winding temperature is within the preset winding temperature range;

[0028] If the generator winding temperature is not within the preset winding temperature range, a corresponding generator alarm signal is generated;

[0029] Judging whether the bearing temperature is within the preset bearing temperature range;

[0030] If the bearing temperature is not within the preset bearing temperature range, a corresponding generator alarm signal is generated;

[0031] Judging whether the generator voltage is within the preset voltage range;

[0032] If the generator voltage is not within the preset voltage range, a corresponding generator alarm signal is generated;

[0033] Judging whether the generator current is within the preset current range;

[0034] If the generator current is not within the preset range, a corresponding generator alarm signal is generated;

[0035] The S3 further comprises: according to the generator alarm signal, triggering an alarm and transmitting the generator winding temperature, the bearing temperature, the generator voltage and the generator current to the ship control unit.

[0036] Preferably, the cooling system comprises a central cooler, a high-temperature fresh water closed loop and a low-temperature fresh water closed loop, the low-temperature fresh water closed loop comprising a low-temperature water pump, a middle cooler, a heat exchanger and a temperature regulating valve, the water inlet of the low-temperature water pump being connected with the water outlet of the central cooler, the low-temperature water pump comprising a first water outlet and a second water outlet; the first water outlet being connected with the water inlet of the middle cooler through a first regulating valve, the water outlet of the middle cooler being connected with the water inlet of the heat exchanger, the water outlet of the heat exchanger being connected with the water inlet of the temperature regulating valve, and the heat exchanger being in communication with the high-temperature fresh water closed loop; the second water outlet being in communication with the water inlet of the generator through a second regulating valve, the water outlet of the generator being connected with the water inlet of the temperature regulating valve, one water outlet of the temperature regulating valve being connected with the water inlet of the low-temperature water pump, and the other water outlet of the temperature regulating valve being connected with the water inlet of the central cooler; the control method further comprises:

[0037] S4. Controlling the first regulating valve and the second regulating valve according to the low-temperature water inlet temperature T3 of the generator and the low-temperature water outlet temperature T4 of the generator to adjust the temperature inside the generator and the diesel engine.

[0038] Preferably, the S1 further comprises: acquiring the diesel engine water outlet temperature T5.

[0039] The S2 further comprises: judging whether the diesel engine water outlet temperature T5 is greater than a preset high-temperature cooling temperature threshold value.

[0040] If the diesel engine water outlet temperature T5 is greater than the preset high-temperature cooling temperature threshold value, the thermostat inside the diesel engine is opened.

[0041] If the diesel engine water outlet temperature T5 is less than or equal to the preset high-temperature cooling temperature threshold value, the thermostat inside the diesel engine is not opened.

[0042] Preferably, the common base is further provided with an electric pre-feed pump and a generator oil-water cooler oil pump; the control method further comprises the following steps:

[0043] Judging whether the offshore generator set is started;

[0044] If the offshore generator set is not started, controlling the electric pre-feed pump to run for t0 minutes at intervals of a preset first time; and / or controlling the generator oil-water cooler oil pump to run for t1 minutes at intervals of a preset second time.

[0045] If the offshore generator set is started, the electric pre-feed pump is turned off, and / or the generator oil-water cooler oil pump is controlled to run continuously.

[0046] Preferably, the common base is further provided with an instrument box, an oil electric heater and a cylinder liner water heater; the control method further comprises the following steps:

[0047] The instrument box is powered on, and the oil electric heater and the cylinder liner water heater are started;

[0048] The cylinder liner water heater is started or stopped according to the water temperature in the cylinder liner of the diesel engine;

[0049] The oil electric heater is started or stopped according to the oil temperature;

[0050] It is judged whether the offshore generator set is started;

[0051] If the offshore generator set is started, the instrument box stops the oil electric heater and the cylinder liner water heater.

[0052] Preferably, the cooling system further comprises a water supplement pump, a low-temperature water supplement tank, a water supplement pipe and a gas discharge pipe connected with the low-temperature water supplement tank respectively, and a liquid level detection unit, the water supplement pipe is connected to the pipeline on the water inlet side of the temperature regulating valve, and the gas discharge pipe is connected to the pipeline between the generator and the temperature regulating valve;

[0053] The control method further comprises the following steps:

[0054] The liquid level signal in the low-temperature water tank is acquired;

[0055] It is judged whether the liquid level signal is within a preset liquid level range;

[0056] If the liquid level signal is not within the preset liquid level range, the water supplement pump is started or stopped.

[0057] Preferably, the S3 further comprises: wirelessly transmitting the fuel temperature, the fuel pressure difference and the oil pressure difference to an intelligent management platform.

[0058] Preferably, the cooling system further comprises an external circulation pipeline and a seawater pump, the seawater pump is connected with the water inlet of the central cooler, and the external circulation pipeline, the valve body of the first regulating valve and / or the valve body of the second regulating valve are made of stainless steel.

[0059] After the above technical scheme is adopted, the application has the following beneficial effects:

[0060] The control method of the offshore generator set of the application comprises the following steps: obtaining the high-temperature water inlet temperature T1 of the diesel engine, the low-temperature water outlet temperature T2 of the diesel engine, the low-temperature water inlet temperature T3 of the generator and the low-temperature water outlet temperature T4 of the generator; determining whether the high-temperature water inlet temperature T1 of the diesel engine is greater than the preset maximum temperature Tmax; if the high-temperature water inlet temperature T1 of the diesel engine is greater than the preset maximum temperature Tmax, generating a corresponding overheating check signal of the unit; determining whether the low-temperature water outlet temperature T2 of the diesel engine is greater than the preset diesel engine temperature threshold; if the low-temperature water outlet temperature T2 of the diesel engine is greater than the preset diesel engine temperature threshold, generating a corresponding diesel engine fault check signal; determining whether the low-temperature water inlet temperature T3 of the generator is within the preset first temperature range; if the low-temperature water inlet temperature T3 of the generator is not within the preset first temperature range, generating a corresponding cooling system fault check signal; determining whether the low-temperature water outlet temperature T4 of the generator is greater than the preset generator temperature threshold; if the low-temperature water outlet temperature T4 of the generator is greater than the preset generator temperature threshold, generating a corresponding generator fault check signal; according to the overheating check signal of the unit, issuing a corresponding prompt and checking whether the offshore generator set has a fault; according to the diesel engine fault check signal, issuing a corresponding prompt and checking whether the diesel engine has a fault; according to the cooling system fault check signal, issuing a corresponding prompt and detecting whether the cooling system has a fault; and according to the generator fault check signal, issuing a corresponding prompt and detecting whether the generator has a fault.

[0061] It can be seen that the control method of the application can discover whether the unit, the diesel engine and the cooling system have faults in time by monitoring the temperature of water at different positions in real time, so as to remove the faults in time and improve the reliability of the operation of the unit; and the offshore generator set of the application has high integration, thereby reducing the arrangement space and being compact in structure. BRIEF DESCRIPTION OF DRAWINGS

[0062] Figure 1 is a structural schematic view of the offshore generator set in the application;

[0063] Figure 2 is a structural schematic view of the offshore generator set in the application from another angle;

[0064] Figure 3 is a schematic view of the cooling system in the application;

[0065] Figure 4 is a block diagram of the electrical system in the application;

[0066] Figure 5 is a flow chart of the control method of the offshore generator set in the application;

[0067] Figure: 1 - central cooler, 2 - low temperature water pump, 3 - common base, 4 - heat exchanger, 5 - diesel engine, 6 - elastic coupling, 7 - first regulating valve, 8 - second regulating valve, 9 - generator, 10 - single ball rubber joint, 11 - instrument box, 12 - intercooler, 13 - electric turning gear, 14 - electric pre-feed pump, 15 - oil electric heater, 16 - coarse filter, 17 - water removal filter, 18 - fine filter, 19 - temperature regulating valve, 20 - cylinder jacket water heater, 21 - low temperature water supply tank, 210 - blowdown pipe, 211 - vent, 212 - liquid discharge pipe, 22 - water supply pipe, 23 - air release pipe, 24 - fresh water pump, 25 - thermostat, 26 - sea water pump. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application.

[0069] As shown in Figure 1 and Figure 2 , the offshore generator set of the present application comprises a common base 3, and a container is arranged on the upper surface of the common base 3, i.e. the sea water generator set is a container type generator set. The common base 3 is respectively provided with a diesel engine 5, a generator 9 and a cooling system. Specifically, the common base 3 is provided with a central cooler 1, a low temperature water pump 2, a heat exchanger 4, an elastic coupling 6, a first regulating valve 7, a second regulating valve 8, a single ball rubber joint 10, an instrument box 11, an intercooler 12, an electric turning gear 13, an electric pre-feed pump 14, an oil electric heater 15, a coarse filter 16, a water removal filter 17, a fine filter 18, a temperature regulating valve 19 and a cylinder jacket water heater 20. Since the central cooler 1, the low temperature water pump 2, the first regulating valve 7, the second regulating valve 8, the coarse filter 16, the electric pre-feed pump 14 and the cylinder jacket water heater 20 are all integrated on the common base 3, i.e. all are integrated inside the set, the integration degree of the whole offshore generator set is improved, the internal components and pipelines of the cabin are greatly reduced, and the internal layout space of the shipyard is reduced.

[0070] The sea water pump 26 outside the set is connected with the central cooler 1. The sea water is filtered by a sea water filter and then enters the central cooler 1 under the action of the sea water pump 26. The sea water is discharged from the cabin after heat exchange in the central cooler 1. In a preferred embodiment, the outer circulation pipeline outside the set, the valve body of the first regulating valve 7, the valve body of the second regulating valve 8 and the valve body of the temperature regulating valve 19 are made of stainless steel, which improves the corrosion resistance of the set components and improves the reliability of the set.

[0071] As shown in Figure 1 , Figure 2 and Figure 5As shown, according to the embodiment of the application, the control method of the offshore generator set comprises the following steps:

[0072] Step S1, acquiring the high-temperature water inlet temperature T1 of the diesel engine, the low-temperature water outlet temperature T2 of the diesel engine, the low-temperature water inlet temperature T3 of the generator and the low-temperature water outlet temperature T4 of the generator;

[0073] The high-temperature water inlet temperature T1 of the diesel engine refers to the water temperature entering the diesel engine, the low-temperature water outlet temperature T2 of the diesel engine refers to the water temperature discharged from the offshore generator set, the low-temperature water inlet temperature T3 of the generator refers to the water temperature entering the generator, and the low-temperature water outlet temperature T4 of the generator refers to the water temperature discharged from the generator.

[0074] Step S2, specifically comprising:

[0075] S20, judging whether the high-temperature water inlet temperature T1 of the diesel engine is greater than a preset maximum temperature Tmax;

[0076] If the high-temperature water inlet temperature T1 of the diesel engine is greater than the preset maximum temperature Tmax, i.e., T1>Tmax, a corresponding generator set overheating checking signal is generated; if the high-temperature water inlet temperature T1 of the diesel engine is less than or equal to the preset maximum temperature Tmax, i.e., T1≤Tmax, it indicates that the generator set is running normally. This step enables the application to realize real-time monitoring of the generator set by monitoring the high-temperature water inlet temperature of the diesel engine in real time, so that the fault can be processed in time once it occurs, and the reliability of the operation of the generator set is improved.

[0077] It should be noted that the cause of the overheating of the generator set may be that the cooling components in the diesel engine 5 fail, such as the malfunction of the thermostat 25, which cannot be opened in time, so that the high-temperature water discharged from the diesel engine 5 cannot be heat-exchanged in the heat exchanger 4, resulting in problems in the heat dissipation of the diesel engine, and further resulting in the overheating of the generator set.

[0078] S21, judging whether the low-temperature water outlet temperature T2 of the diesel engine is greater than a preset diesel engine temperature threshold;

[0079] If the low-temperature water outlet temperature T2 of the diesel engine is greater than the preset diesel engine temperature threshold, a corresponding diesel engine fault checking signal is generated; if the low-temperature water outlet temperature T2 of the diesel engine is less than or equal to the preset diesel engine temperature threshold, it indicates that the diesel engine 5 is running at low load at this time. This step enables the application to realize real-time monitoring of the diesel engine 5 by monitoring the low-temperature water outlet temperature in real time, so that the fault can be processed in time once it occurs, and the reliability of the operation of the generator set is improved.

[0080] S22, judging whether the low-temperature water inlet temperature T3 of the generator is within a preset first temperature range;

[0081] If the generator low-temperature inlet water temperature T3 is not within the preset first temperature range, a corresponding cooling system fault check signal is generated; if the generator low-temperature inlet water temperature T3 is within the preset first temperature range, it indicates that the cooling system is operating normally and can effectively dissipate heat for the generator and the diesel engine 5. This step enables the present application to realize real-time monitoring of the cooling system by monitoring the generator low-temperature inlet water temperature in real time, so that once a fault occurs, it can be handled in a timely manner, thereby improving the reliability of the unit operation.

[0082] It should be noted that the cause of the cooling system failure can be a malfunction of the temperature regulating valve 19. Once the temperature regulating valve 19 malfunctions, it cannot direct the generator outlet water and / or the heat exchanger 4 outlet water into the central cooler 1, and cannot exchange heat with the external low-temperature seawater, resulting in abnormal generator low-temperature inlet water temperature.

[0083] S23, determining whether the generator low-temperature outlet water temperature T4 is greater than a preset generator temperature threshold value;

[0084] If the generator low-temperature outlet water temperature T4 is greater than the preset generator temperature threshold value, a corresponding generator fault check signal is generated; if the generator low-temperature outlet water temperature T4 is less than or equal to the preset generator temperature threshold value, it indicates that the generator is operating at low load. This step enables the present application to realize real-time monitoring of the generator by monitoring the generator low-temperature outlet water temperature in real time, so that once a fault occurs, it can be handled in a timely manner, thereby improving the reliability of the unit operation.

[0085] Step S3, according to the unit overheating check signal, issuing a corresponding prompt and checking whether the offshore generator unit has a fault;

[0086] According to the diesel engine fault check signal, issuing a corresponding prompt and checking whether the diesel engine has a fault;

[0087] According to the cooling system fault check signal, issuing a corresponding prompt and detecting whether the cooling system has a fault;

[0088] According to the generator fault check signal, issuing a corresponding prompt and detecting whether the generator has a fault.

[0089] The control method of the present application can effectively monitor the unit, the generator 9, the diesel engine 5 and the cooling system in real time by monitoring the water temperature at different positions in the integrated pipeline in the unit, can timely discover and handle faults, improves the reliability of the unit operation, ensures the heat dissipation efficiency of the cooling system, and the method of the present application is simple to implement and low in cost.

[0090] As Figure 4As shown, in some embodiments of the application, the marine generator set includes a unit control unit, and the unit control unit is electrically connected with the diesel engine electronic control unit, the generator and the ship control unit. In a preferred embodiment, the unit control unit also communicates wirelessly with the intelligent management platform through a wireless communication unit. Different sensors are arranged on the generator 9 and the diesel engine 5 to detect operating parameters, operating data, operating states, etc., and transmit them to the unit control unit. The unit control unit is electrically connected with the electric pre-feed pump 14, the generator oil-water cooler oil pump, the oil electric heater 15 and the cylinder sleeve water heater 20. The unit control unit is arranged in the instrument box 11.

[0091] As shown in the drawings, Figure 4 In the application, the diesel engine also has the following controls:

[0092] Step S1 also includes: obtaining the fuel temperature, fuel pressure difference and oil pressure difference of the diesel engine; wherein the fuel temperature can be detected by a fuel temperature sensor arranged on the diesel engine, the fuel pressure difference can be detected by a fuel pressure sensor arranged on the diesel engine, and the oil pressure difference can be detected by an oil pressure sensor 1 and an oil pressure sensor 2 arranged on the diesel engine.

[0093] Step S2 also includes:

[0094] S24, judge whether the fuel temperature is in the preset fuel temperature range;

[0095] If the fuel temperature is not in the preset fuel temperature range, a corresponding diesel engine alarm signal is generated, and at this time the diesel engine alarm signal is an oil temperature alarm signal;

[0096] S25, judge whether the fuel pressure difference is in the preset fuel pressure difference range;

[0097] If the fuel pressure difference is not in the preset fuel pressure difference range, a corresponding diesel engine alarm signal is generated, and at this time the diesel engine alarm signal is an oil pressure alarm signal;

[0098] S26, judge whether the oil pressure difference is in the preset oil pressure difference range;

[0099] If the oil pressure difference is not in the preset oil pressure difference range, a corresponding diesel engine alarm signal is generated, and at this time the diesel engine alarm signal is an oil pressure difference alarm signal;

[0100] Step S3 also includes: according to the diesel engine alarm signal, triggering an alarm and transmitting the fuel temperature, fuel pressure difference and oil pressure difference to the ship control unit; in a preferred embodiment, the ship control unit transmits the fuel temperature, fuel pressure difference and oil pressure difference to the intelligent management platform through a wireless communication unit, which is convenient for data collection and analysis, and provides intelligent management services for customers.

[0101] As shown in the drawings, Figure 4As shown, the generator in the application also has the following:

[0102] Step S1 also includes: obtaining the generator winding temperature, bearing temperature, generator voltage and generator current;

[0103] Step S2 also includes:

[0104] S27, judge whether the generator winding temperature is in the preset winding temperature range;

[0105] If the generator winding temperature is not in the preset winding temperature range, the corresponding generator alarm signal is generated, and the generator alarm signal is the winding temperature alarm signal;

[0106] S28, judge whether the bearing temperature is in the preset bearing temperature range;

[0107] If the bearing temperature is not in the preset bearing temperature range, the corresponding generator alarm signal is generated, and the generator alarm signal is the bearing temperature alarm signal;

[0108] S29, judge whether the generator voltage is in the preset voltage range;

[0109] If the generator voltage is not in the preset voltage range, the corresponding generator alarm signal is generated, and the generator alarm signal is the voltage alarm signal;

[0110] Judge whether the generator current is in the preset current range;

[0111] S200, if the generator current is not in the preset range, the corresponding generator alarm signal is generated, and the generator alarm signal is the current alarm signal;

[0112] Step S3 also includes: according to the generator alarm signal, trigger alarm and transmit the generator winding temperature, bearing temperature, generator voltage and generator current to the ship control unit; a preferred scheme, the ship control unit transmits the generator winding temperature, bearing temperature, generator voltage and generator current to the intelligent management platform through the wireless communication unit, which is convenient for data collection and analysis, and provides intelligent management service for customers.

[0113] Through the above steps, the marine generator set related to the application realizes effective detection of various parameters of the generator and the diesel engine, realizes cooperative control of the external components of the unit, facilitates data collection and analysis, and provides intelligent management service for customers. In addition, the data of the generator and the diesel engine detected by the application is not limited to the above, but also includes fuel leakage of the diesel engine, water leakage of the generator, etc.

[0114] As Figure 3As shown, in some embodiments of the present application, the cooling system comprises a central cooler 1, a high-temperature fresh water closed loop and a low-temperature fresh water closed loop, the low-temperature fresh water closed loop comprising a low-temperature water pump 2, a intercooler 12, a heat exchanger 4 and a temperature regulating valve 19, the water inlet of the low-temperature water pump 2 being connected with the water outlet of the central cooler 1, wherein the low-temperature water pump 2 comprises a first water outlet and a second water outlet.

[0115] The first water outlet is connected with the water inlet of the intercooler 12 through a first regulating valve 7, the water outlet of the intercooler 12 is connected with the water inlet of the heat exchanger 4, the water outlet of the heat exchanger 4 is connected with the water inlet of the temperature regulating valve 19, and the heat exchanger 4 is in communication with the high-temperature fresh water closed loop.

[0116] The second water outlet is connected with the water inlet of the generator 9 through a second regulating valve 8, the water outlet of the generator 9 is connected with the water inlet of the temperature regulating valve 19, one water outlet of the temperature regulating valve 19 is connected with the water inlet of the low-temperature water pump 2, and the other water outlet of the temperature regulating valve 19 is connected with the water inlet of the central cooler 1. That is, the cooling system of the present application is a double closed cooling system, which realizes high-temperature and low-temperature fresh water closed loop and improves the reliability.

[0117] It should be noted that the high-temperature fresh water closed loop is the cooling loop inside the diesel engine 5, and details are shown in Figure 3 The cooling loop inside the diesel engine 5 comprises a cooling pipeline, a thermostat 25 and a fresh water pump 24, and the thermostat 25 is connected with the heat exchanger 4.

[0118] The control method of the present application further comprises:

[0119] Step S4, according to the low-temperature water inlet temperature T3 of the generator and the low-temperature water outlet temperature T4 of the generator, the first regulating valve 7 and the second regulating valve 8 are controlled to adjust the internal temperature of the generator and the diesel engine.

[0120] Step S1 further comprises: obtaining the diesel engine water outlet temperature T5;

[0121] Step S2 further comprises: judging whether the diesel engine water outlet temperature T5 is greater than the preset high-temperature cooling temperature threshold value;

[0122] If the diesel engine water outlet temperature T5 is greater than the preset high-temperature cooling temperature threshold value, the thermostat inside the diesel engine is opened, and the high-temperature water discharged from the diesel engine enters the heat exchanger 4 to exchange heat with the low-temperature water in the low-temperature fresh water closed loop, that is, the diesel engine cooling large circulation is realized.

[0123] If the diesel engine water outlet temperature T5 is less than or equal to the preset high-temperature cooling temperature threshold value, the thermostat inside the diesel engine is not opened, and at this time, the high-temperature water inside the diesel engine is in small circulation in the diesel engine cooling loop.

[0124] In summary, the low-temperature water pump 2 of the application divides the water drawn out by the central cooler 1 into two paths, one path passes through the second regulating valve 8 into the generator 9, and after the generator 9 is cooled, enters the temperature regulating valve 19, if the generator outlet water temperature T4 is greater than 36℃, the temperature regulating valve 19 is actuated and connected with the central cooler 1, so that the outlet water of the temperature regulating valve 19 enters the central cooler 1 for heat exchange, if less than 36℃, the temperature regulating valve 19 is connected with the low-temperature water pump 2, that is, the outlet water of the temperature regulating valve 19 does not pass through the central cooler 1 and directly enters the low-temperature water pump 2; the other path passes through the pipeline to the first regulating valve 7 into the intercooler 12 to cool the air, and then enters the heat exchanger 4, and after the outlet water of the heat exchanger 4 is collected with the generator outlet water, reaches the temperature regulating valve 19, and enters different components according to the water temperature.

[0125] The high-temperature fresh water closed circulation system, the water outlet of the cylinder liner in the diesel engine 5 passes through the thermostat 25, and if the opening temperature is not reached, the water enters the on-board fresh water pump 24 to continue the internal small circulation of the diesel engine 5, if the opening temperature is reached, the cylinder liner water enters the heat exchanger 4 to perform external heat exchange with the low-temperature fresh water, that is, the high-temperature water is externally circulated.

[0126] As shown in Figure 3 some embodiments of the application, the cooling system further comprises a water supplement pump, a low-temperature water supplement tank 21, a water supplement pipe 22 and a gas discharge pipe 23 connected with the low-temperature water supplement tank 21 respectively, and a liquid level detection unit, the water supplement pipe 22 is connected to the pipeline on the water inlet side of the temperature regulating valve 19, the gas discharge pipe 23 is connected to the pipeline between the generator 9 and the temperature regulating valve 19, specifically, the gas discharge pipe 23 is arranged on the pipeline between the generator 9 and the temperature regulating valve 19 at a high position, and the water supplement pump and the liquid level detection unit are electrically connected with the unit control unit respectively;

[0127] The control method of the application further comprises the following steps:

[0128] obtaining a liquid level signal in the low-temperature water tank;

[0129] determining whether the liquid level signal is within a preset liquid level range;

[0130] if the liquid level signal is not within the preset liquid level range, starting or stopping the water supplement pump.

[0131] It should be noted that: the low-temperature water supplement tank 21 is provided with a vent 211, which is in communication with the top end of the low-temperature water supplement tank 21, when there is gas in the pipeline of the low-temperature fresh water closed loop, the gas is discharged into the low-temperature water supplement tank 21 through the gas discharge pipe 23, and finally discharged from the vent 211, so as to ensure the normal circulation of the pipeline in the whole cooling system. At the same time, the gas discharge pipe 23 and the water supplement pipe 22 are respectively provided with electric valves, which can be closed when maintenance and replacement are needed.

[0132] The bottom of the low-temperature water supplement tank 21 is provided with a drain pipe 210, the drain pipe 210 is provided with a valve, the outer side of the low-temperature water supplement tank 21 is provided with a drain pipe 212, the drain pipe 212 is communicated with the top end of the low-temperature water supplement tank 21 and the outlet side of the valve, and the drain pipe 212 can drain the dirt at the top of the low-temperature water supplement tank 21.

[0133] As shown in Figure 1 、 Figure 2 and Figure 4 , in some embodiments of the application, the common base 3 is further provided with an electric pre-feed pump 14 and a generator oil-water cooler oil pump; based on this, the control method of the application further comprises the following steps:

[0134] determining whether the marine generator set is started;

[0135] if the marine generator set is not started, controlling the electric pre-feed pump to run for a preset first time interval and automatically shutting down after running for t0 minutes; in an embodiment, the preset first time interval can be half an hour, and t0 can be but is not limited to 5; and / or; controlling the generator oil-water cooler oil pump to run for a preset second time interval and automatically shutting down after running for t1 minutes; in an embodiment, the preset second time interval can be half an hour, and t1 can be but is not limited to 2;

[0136] if the marine generator set is started, shutting down the electric pre-feed pump, and / or, controlling the generator oil-water cooler oil pump to continuously run.

[0137] Meanwhile, the common base 3 is further provided with an instrument box 11, an oil electric heater 15 and a cylinder jacket water heater 20; based on this, the control method of the application further comprises the following steps:

[0138] turning on the instrument box, starting the oil electric heater and the cylinder jacket water heater;

[0139] according to the water temperature in the cylinder jacket of the diesel engine, closed-loop controlling the start and stop of the cylinder jacket water heater;

[0140] according to the oil temperature, closed-loop controlling the start and stop of the oil electric heater;

[0141] determining whether the marine generator set is started;

[0142] if the marine generator set is started, the instrument box stops the oil electric heater and the cylinder jacket water heater.

[0143] It should be noted that: the oil electric heater 15 and the cylinder liner water heater 20 are provided with a closed loop control unit, that is, when it is detected that the marine generator set is started, the oil electric heater 15 uses the real-time oil temperature to automatically start and stop, so that the oil temperature is kept in a constant range, closed control is realized, and the reliability of the unit operation is improved.

[0144] In summary, according to the demand of high-end offshore mobile platform, the electrical system of the unit is increased with the control of the electric pre-feed pump 14, the electric turning gear 13, the generator oil-water cooler oil pump and the oil electric heater 15. For the electric pre-feed pump 14, the pre-feed oil is automatically operated for 5 minutes every half hour before the unit is started, and is automatically closed after the unit is started. For the generator oil-water cooler oil pump, the pre-feed oil is automatically operated for 2 minutes every half hour before the unit is started, and is always operated after the unit is started. For the oil electric heater 15 and the cylinder liner water heater 20, the separate control module is used for preheating and temperature control before starting.

[0145] In summary, compared with the prior art, the control method of the marine generator set has the following advantages:

[0146] The marine generator set of the present application has the following advantages:

[0147] The diesel engine 5 and the generator are effectively monitored, the peripheral components of the unit are cooperatively controlled, the preparation before the unit is operated (automatic control of each auxiliary heating, friction pair pre-lubrication and low-temperature water tank water supplementing) is effectively carried out, the safety of the unit operation is ensured, the automation level of the unit is high, and the operator is more simple and convenient to operate. Through the cooperative control of the diesel engine electric control unit and the instrument box 11, the unit data is uploaded to the intelligent ship platform, data collection and analysis are facilitated, and intelligent management services are provided for customers.

[0148] Through the temperature control of the diesel engine 5 and the generator 9, the energy consumption of the unit is effectively reduced, the reliability of the unit is effectively improved through the double-closed cooling system design and the material optimization of the components, and the unit is more safe, stable and has a longer service life.

[0149] The above is only a preferred embodiment of the present application, and does not limit the present application. Any modification, equivalent control method of the marine generator set and improvement within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A control method for an offshore generator set, the offshore generator set comprising a common base, characterized in that, The common base is equipped with a diesel engine, a generator, and a cooling system. The control method includes the following steps: S1. Obtain the diesel engine high-temperature water inlet temperature T1, low-temperature water outlet temperature T2, generator low-temperature water inlet temperature T3, and generator low-temperature water outlet temperature T4. S2. Determine whether the high-temperature water inlet temperature T1 of the diesel engine is greater than the preset maximum temperature Tmax; If the diesel engine high-temperature water inlet temperature T1 is greater than the preset maximum temperature Tmax, a corresponding unit overheat check signal will be generated. Determine whether the low-temperature water outlet temperature T2 is greater than the preset diesel engine temperature threshold. If the low-temperature water outlet temperature T2 is greater than the preset diesel engine temperature threshold, a corresponding diesel engine fault check signal will be generated. Determine whether the generator's low-temperature inlet water temperature T3 is within the preset first temperature range; If the generator low-temperature inlet water temperature T3 is not within the preset first temperature range, a corresponding cooling system fault check signal will be generated. Determine whether the generator's low-temperature outlet water temperature T4 is greater than the preset generator temperature threshold. If the generator low-temperature outlet water temperature T4 is greater than the preset generator temperature threshold, a corresponding generator fault check signal will be generated. S3. Based on the overheating check signal of the generator set, issue corresponding prompts and check whether there is a fault in the offshore generator set; based on the diesel engine fault check signal, issue corresponding prompts and check whether there is a fault in the diesel engine; based on the cooling system fault check signal, issue corresponding prompts and check whether there is a fault in the cooling system; based on the generator fault check signal, issue corresponding prompts and check whether there is a fault in the generator.

2. The control method for offshore generator sets according to claim 1, characterized in that, S1 further includes: acquiring the fuel temperature, fuel pressure differential and oil pressure differential of the diesel engine; The S2 further includes: determining whether the fuel temperature is within a preset fuel temperature range; If the fuel temperature is not within the preset fuel temperature range, a corresponding diesel engine alarm signal will be generated; Determine if the fuel pressure differential is within the preset fuel pressure differential range; If the fuel pressure differential is not within the preset fuel pressure differential range, a corresponding diesel engine alarm signal will be generated; Determine if the oil pressure differential is within the preset oil pressure differential range; If the oil pressure differential is not within the preset oil pressure differential range, a corresponding diesel engine alarm signal will be generated; The S3 further includes: triggering an alarm based on the diesel engine alarm signal and transmitting fuel temperature, fuel pressure differential and oil pressure differential to the ship control unit.

3. The control method for offshore generator sets according to claim 1, characterized in that, S1 further includes: acquiring generator winding temperature, bearing temperature, generator voltage, and generator current; The S2 further includes: determining whether the generator winding temperature is within the preset winding temperature range; If the generator winding temperature is not within the preset winding temperature range, a corresponding generator alarm signal will be generated; Determine if the bearing temperature is within the preset bearing temperature range; If the bearing temperature is outside the preset bearing temperature range, a corresponding generator alarm signal will be generated. Determine if the generator voltage is within the preset voltage range; If the generator voltage is not within the preset voltage range, a corresponding generator alarm signal will be generated; Determine if the generator current is within the preset current range; If the generator current is not within the preset range, a corresponding generator alarm signal will be generated; The S3 further includes: triggering an alarm based on the generator alarm signal and transmitting the generator winding temperature, bearing temperature, generator voltage, and generator current to the ship control unit.

4. The control method for offshore generator sets according to claim 1, characterized in that, The cooling system includes a central cooler, a high-temperature freshwater closed-loop circulation loop, and a low-temperature freshwater closed-loop circulation loop. The low-temperature freshwater closed-loop circulation loop includes a low-temperature water pump, an intercooler, a heat exchanger, and a temperature control valve. The inlet of the low-temperature water pump is connected to the outlet of the central cooler. The low-temperature water pump includes a first outlet and a second outlet. The first water outlet is connected to the water inlet of the intercooler via the first regulating valve, the water outlet of the intercooler is connected to the water inlet of the heat exchanger, the water outlet of the heat exchanger is connected to the water inlet of the temperature regulating valve, and the heat exchanger is connected to the high-temperature freshwater closed-loop circulation circuit. The second outlet is connected to the generator inlet via the second regulating valve. The generator outlet is connected to the temperature regulating valve inlet. One outlet of the temperature regulating valve is connected to the inlet of the low-temperature water pump. The other outlet of the temperature regulating valve is connected to the inlet of the central cooler. The control method further includes: S4. Based on the generator's low-temperature inlet water temperature T3 and generator's low-temperature outlet water temperature T4, control the first regulating valve and the second regulating valve to adjust the internal temperature of the generator and diesel engine.

5. The control method for offshore generator sets according to claim 4, characterized in that, S1 further includes: obtaining the diesel engine outlet water temperature T5; The S2 further includes: determining whether the diesel engine outlet water temperature T5 is greater than a preset high-temperature cooling temperature threshold. If the diesel engine outlet water temperature T5 is greater than the preset high temperature cooling temperature threshold, then the thermostat inside the diesel engine will be opened. If the diesel engine outlet water temperature T5 is less than or equal to the preset high-temperature cooling temperature threshold, the internal thermostat of the diesel engine will not be opened.

6. The control method for offshore generator sets according to claim 1, characterized in that, The common base is also equipped with an electric pre-supply pump and a generator oil-water cooler oil pump. The control method further includes the following steps: Determine whether the offshore generator set is powered on; If the offshore generator set is not started, control the electric pre-supply pump to run for a first time interval of t0 minutes; and / or control the generator oil-water cooler oil pump to run for a second time interval of t1 minutes; If the offshore generator set is started, the electric pre-supply pump is shut down, and / or the oil pump of the generator oil-water cooler is controlled to continue running.

7. The control method for offshore generator sets according to claim 1, characterized in that, The common base is also equipped with an instrument box, a lubricating oil electric heater, and a cylinder liner water heater; The control method further includes the following steps: Power on the instrument box and start the lubricating oil electric heater and the cylinder liner water heater; The cylinder liner water heater is started and stopped in a closed loop based on the water temperature inside the diesel engine cylinder liner. The start and stop of the lubricating oil electric heater are controlled in a closed loop according to the lubricating oil temperature. Determine whether the offshore generator set is powered on; If the offshore generator set is started, the instrument box will stop the lubricating oil electric heater and the cylinder liner water heater.

8. The control method for an offshore generator set according to claim 4, characterized in that, The cooling system also includes a water pump, a low-temperature water tank, a water supply pipe and a vent pipe connected to the low-temperature water tank, and a liquid level detection unit. The water supply pipe is connected to the pipeline on the inlet side of the temperature control valve, and the vent pipe is connected to the pipeline between the generator and the temperature control valve. The control method further includes the following steps: Acquire the liquid level signal inside the low-temperature water tank; Determine whether the liquid level signal is within the preset liquid level range; If the liquid level signal is not within the preset liquid level range, start or stop the water replenishment pump.

9. The control method for an offshore generator set according to claim 2, characterized in that, The S3 also includes: wirelessly transmitting fuel temperature, fuel pressure differential and oil pressure differential to the intelligent management platform.

10. The control method for an offshore generator set according to claim 4, characterized in that, The cooling system also includes an external circulation pipeline and a seawater pump. The seawater pump is connected to the inlet of the central cooler, and the external circulation pipeline, the valve body of the first regulating valve, and / or the valve body of the second regulating valve are made of stainless steel.

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