A method for solving different fuel viscosity requirements of ship main engine and generator

Abstract

The present invention relates to the field of ship fuel supply technology, and more specifically, to a method for solving different requirements for fuel viscosity of a ship main engine and a generator, comprising: (1) determining a ship main engine and a generator fuel supply conversion system; (2) designing a ship main engine and a generator fuel supply conversion unit; (3) installing the ship main engine and a generator fuel supply conversion unit; and (4) performing conversion control. The method is used to control the fuel viscosity of the main engine and a generator, and has the advantages of simple method, good conversion effect, energy saving, cost saving, etc.

Description

Technical Field

[0001] The invention relates to the technical field of ship fuel supply, in particular to a method for solving different requirements of fuel viscosity of a ship main engine and a generator with simple method, good conversion effect, energy saving and cost saving. Background Art

[0002] As we all know, the main engine and generator of a ship share a fuel supply unit, which means that the fuel supply unit can only output fuel of one viscosity. However, the fuel viscosity required by the main engine and generator is not in the same range, as shown below: -Main engine fuel viscosity requirement: 16~24 (cSt) -Generator fuel viscosity requirement: 11~14 (cSt) in any case. At present, the fuel supply unit includes a DO diesel tank and an HFO heavy oil tank. The DO diesel tank and the HFO heavy oil tank are connected to the fuel supply pipe through the oil pipeline, and the fuel supply pipe is connected to the main engine and the generator through the fuel supply branch pipe. The HFO heavy oil tank is connected to the heater, and the heater heats the HFO heavy oil tank to 125°C, so that the heavy oil in the HFO heavy oil tank meets the main engine fuel viscosity requirement required by the main engine: 16~24 (cSt). The heavy oil needs to be heated to 140°C to meet the generator's requirements for heavy oil viscosity. Therefore, the fuel supply unit can only meet the main engine's fuel viscosity requirements, but not the generator's fuel viscosity requirements. If the fuel supply unit is modified, an additional set of heaters, viscometers, and related supporting valves need to be added to the fuel supply unit, and the internal logic and electrical programs need to be modified. For the fuel supply unit manufacturer, this is a non-standard configuration with high cost, and the key is to affect the delivery cycle. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art and to provide a method for solving the different requirements of fuel viscosity of ship main engine-generator with simple method, good conversion effect, energy saving and cost saving.

[0004] The technical solution adopted by the present invention to solve the technical problem is: A method for solving different requirements of fuel viscosity of ship main engine and generator, characterized in that the method steps are as follows: (1) Determine the fuel supply conversion system for the ship's main engine and generator, which includes a fuel supply unit, a main engine and a generator. The fuel supply unit is equipped with a DO diesel tank and an HFO heavy fuel tank. The DO diesel tank and the HFO heavy fuel tank are connected to the fuel supply pipe through oil pipelines. The fuel supply pipe is connected to the main engine and the generator through fuel supply branch pipes; (2) Design of the oil supply conversion unit for the ship's main engine and generator: The oil supply conversion unit includes a steam heater, a pneumatic three-way ball valve, a diesel branch pipe, a heavy oil inlet pipe, a heavy oil outlet pipe, an oil guide pipe, a check valve, and an oil inlet valve. One outlet B of the pneumatic three-way ball valve is connected to the heavy oil inlet pipe, and the other outlet C of the pneumatic three-way ball valve is connected to the inlet of the diesel branch pipe. The heavy oil inlet pipe is connected to the oil inlet of the steam heater, and the oil outlet of the steam heater is connected to the heavy oil outlet pipe. The heavy oil inlet pipe is equipped with an oil inlet valve, and the heavy oil outlet pipe is equipped with a check valve. The outlet of the heavy oil outlet pipe and the outlet of the diesel branch pipe are connected to the oil guide pipe via a three-way pipe. An electric temperature control valve is installed on the steam inlet pipe of the steam heater. The oil guide pipe is equipped with a first temperature sensor. A temperature sensor and an electric temperature control valve are respectively connected to the controller, the first temperature sensor transmits a temperature signal to the controller, the controller transmits the signal to the electric temperature control valve, thereby realizing the control of the steam flow entering the steam intake pipe, a second temperature sensor and an alarm are installed on the oil guide pipe, the second temperature sensor and the alarm are respectively connected to the controller, the second temperature sensor transmits a temperature signal to the controller, the controller transmits the temperature signal to the alarm, the alarm alarms the temperature exceeding the setting in the controller, the pneumatic three-way ball valve is connected to the controller, the controller is connected to the oil supply unit, the oil supply unit transmits a signal of diesel or heavy oil to the controller, and the controller controls the switching action of the pneumatic three-way ball valve; (3) Install the oil supply conversion unit for the ship's main engine and generator: connect the inlet A of the pneumatic three-way ball valve to the oil supply branch pipe, and connect the oil guide pipe to the oil inlet of the generator; (4) Conversion control: After installation according to step (3), there are two conversion modes, diesel mode and heavy oil mode. In heavy oil mode, the AB port of the pneumatic three-way ball valve is open, and in diesel mode, the AC port of the pneumatic three-way ball valve is open.

[0005] The specific steps of the conversion control of step (4) described in the present invention are as follows: when the ship is started, in order to achieve a quick start, diesel needs to enter the generator. Therefore, at this time, the AC port of the pneumatic three-way ball valve is open, and the diesel enters the oil guide pipe through the diesel branch pipe and finally enters the generator. After the ship is started, during the voyage, in order to save costs, heavy oil is needed to work. At this time, the AB port of the pneumatic three-way ball valve is open, and the oil inlet valve is opened. At this time, the heavy oil enters the steam heater for heating. When the temperature of the heavy oil discharged after heating reaches 140°C, the first temperature sensor transmits a signal to the controller, and the controller transmits a signal to the electric temperature control valve. The electric temperature control valve stops opening, and the steam continues to enter the steam heater according to the current flow rate. At this time, the heavy oil is stably heated to 140°C and is not heated any further. The heavy oil enters the oil guide pipe through the heavy oil outlet pipe and finally enters the generator. The motor is used. When the ship needs to dock, in order to reserve diesel in the pipeline, 1-2 hours before docking, the AC port of the pneumatic three-way ball valve is opened, and the diesel enters the oil pipe through the diesel branch pipe and finally enters the generator, ensuring that the oil retained in the oil pipe is diesel, which is convenient for the next quick start of the ship. Since a second temperature sensor is provided on the oil pipe, the temperature of the second sensor is set to 45°C. When the pneumatic three-way ball valve is converted to the AC port, when the temperature on the oil pipe exceeds 45°C, the second temperature sensor transmits a signal to the controller, and the controller transmits a signal to the alarm. The alarm sounds, indicating that the pneumatic three-way ball valve is converted to the AC port but not opened, but the AB port is opened, the diesel is heated, and then the alarm is sounded, reminding the operator to check whether the conversion action of the pneumatic three-way ball valve is correct to avoid the risk of diesel heating caused by misoperation.

[0006] The present invention has the advantages of simple method, good conversion effect, energy saving, cost saving, etc. due to the adoption of the above structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0008] The present invention is further described below in conjunction with the accompanying drawings: As shown in the attached figure, a method for solving the different requirements of fuel viscosity of ship main engine and generator is characterized in that the method steps are as follows: (1) Determine the fuel supply conversion system for the ship's main engine and generator, which includes a fuel supply unit 1, a main engine 2 and a generator 3. The fuel supply unit 1 is provided with a DO diesel tank 4 and an HFO heavy oil tank 5. The DO diesel tank 4 and the HFO heavy oil tank 5 are respectively connected to a fuel supply pipe 6 via an oil pipeline. The fuel supply pipe 6 is respectively connected to the main engine 2 and the generator 3 via a fuel supply branch pipe 7; (2) Design of the oil supply conversion unit for the ship's main engine and generator: The oil supply conversion unit comprises a steam heater 8, a pneumatic three-way ball valve 9, a diesel branch pipe 10, a heavy oil inlet pipe 11, a heavy oil outlet pipe 12, an oil guide pipe 13, a check valve 14, and an oil inlet valve 15. One outlet B of the pneumatic three-way ball valve 9 is connected to the heavy oil inlet pipe 11, and another outlet C of the pneumatic three-way ball valve 9 is connected to the inlet of the diesel branch pipe 10. The heavy oil inlet pipe 11 is connected to the oil inlet of the steam heater 8, and the oil outlet of the steam heater 8 is connected to the heavy oil outlet pipe 12. The heavy oil inlet pipe 11 is equipped with an oil inlet valve 15, and the heavy oil outlet pipe 12 is equipped with a check valve 14. The outlet of the heavy oil outlet pipe 12 and the outlet of the diesel branch pipe 10 are connected to the oil guide pipe 13 via a three-way pipe. An electric temperature control valve 16 is installed on the steam inlet pipe of the steam heater 8, and a first temperature control valve 16 is installed on the oil guide pipe 13. The temperature sensor 17, the first temperature sensor 17 and the electric temperature control valve 16 are respectively connected to the controller 18, the first temperature sensor 17 transmits the temperature signal to the controller 18, the controller 18 transmits the signal to the electric temperature control valve 16, thereby realizing the control of the steam flow entering the steam intake pipe, the second temperature sensor 19 and the alarm 20 are installed on the oil guide pipe 13, the second temperature sensor 19 and the alarm 20 are respectively connected to the controller 18, the second temperature sensor 19 transmits the temperature signal to the controller 18, the controller 18 transmits the temperature signal to the alarm 20, the alarm 20 alarms the excessive temperature set in the controller 18, the pneumatic three-way ball valve 9 is connected to the controller 18, the controller 18 is connected to the oil supply unit 1, the oil supply unit 1 transmits the signal of diesel or heavy oil to the controller 18, and the controller 18 controls the switching action of the pneumatic three-way ball valve 9; (3) Install the oil supply conversion unit for the ship's main engine and generator: connect the inlet A of the pneumatic three-way ball valve 9 to the oil supply branch pipe 7, and connect the oil guide pipe 13 to the oil inlet of the generator 3; (4) Conversion control: After installation according to step (3), there are two conversion modes, diesel mode and heavy oil mode. In heavy oil mode, the AB port of the pneumatic three-way ball valve is open, and in diesel mode, the AC port of the pneumatic three-way ball valve is open.

[0009] The specific steps of the conversion control of step (4) described in the present invention are as follows: when the ship is started, in order to achieve a quick start, diesel needs to enter the generator 3. Therefore, at this time, the AC port of the pneumatic three-way ball valve 9 is open, and the diesel enters the oil guide pipe 13 through the diesel branch pipe 10 and finally enters the generator 3. After the ship is started, during the voyage, in order to save costs, heavy oil is needed to work. At this time, the AB port of the pneumatic three-way ball valve 9 is open, and the oil inlet valve 15 is opened. At this time, the heavy oil enters the steam heater 8 for heating. When the temperature of the heavy oil discharged after heating reaches 140°C, the first temperature sensor 17 transmits a signal to the controller 18, and the controller 18 transmits a signal to the electric temperature control valve 16. The electric temperature control valve 16 stops opening, and the steam continues to enter the steam heater 8 according to the current flow rate. At this time, the heavy oil is stably heated to 140°C and is not further heated. The heavy oil enters the oil guide pipe 13 through the heavy oil outlet pipe 12 and finally enters the generator. When the ship needs to dock, in order to reserve diesel in the pipeline, 1-2 hours before docking, the AC port of the pneumatic three-way ball valve 9 is opened, and the diesel enters the oil pipe 13 through the diesel branch pipe 10 and finally enters the generator 3, ensuring that the oil reserved in the oil pipe 13 is diesel, which is convenient for the next quick start of the ship. Since the oil pipe 13 is provided with a second temperature sensor 19, the temperature of the second sensor is set to 45°C. When the pneumatic three-way ball valve 9 is converted to the AC port, when the temperature on the oil pipe 13 exceeds 45°C, the second temperature sensor 19 transmits a signal to the controller 18, and the controller 18 transmits a signal to the alarm 20. The alarm 20 alarms, indicating that the pneumatic three-way ball valve 9 is converted to the AC port but not opened, but the AB port is opened, the diesel is heated, and then an alarm is sounded to remind the operator to check whether the conversion action of the pneumatic three-way ball valve 9 is correct to avoid the risk of diesel heating caused by misoperation.

[0010] The steam heater 8 described above is a steam heat exchanger, and the steam inlet pipe and steam outlet pipe of the steam heat exchanger are respectively connected to the pipelines of the steam system of the boiler in the ship. The above-mentioned controller 18 is a monitoring alarm controller 18, which is the prior art. Its internal specific structure and connection method are all the prior art and will not be repeated here. Due to the adoption of the above-mentioned structure, the present invention has the advantages of simple method, good conversion effect, energy saving, cost saving, etc.

Claims

1. A method for solving the different requirements of fuel viscosity of ship main engine and generator, characterized in that The steps are as follows: (1) Determine the fuel supply conversion system for the ship's main engine and generator, which includes a fuel supply unit, a main engine and a generator. The fuel supply unit is equipped with a DO diesel tank and an HFO heavy fuel tank. The DO diesel tank and the HFO heavy fuel tank are connected to the fuel supply pipe through oil pipelines. The fuel supply pipe is connected to the main engine and the generator through fuel supply branch pipes; (2) Design of the oil supply conversion unit for the ship's main engine and generator: The oil supply conversion unit includes a steam heater, a pneumatic three-way ball valve, a diesel branch pipe, a heavy oil inlet pipe, a heavy oil outlet pipe, an oil guide pipe, a check valve, and an oil inlet valve. One outlet B of the pneumatic three-way ball valve is connected to the heavy oil inlet pipe, and the other outlet C of the pneumatic three-way ball valve is connected to the inlet of the diesel branch pipe. The heavy oil inlet pipe is connected to the oil inlet of the steam heater, and the oil outlet of the steam heater is connected to the heavy oil outlet pipe. The heavy oil inlet pipe is equipped with an oil inlet valve, and the heavy oil outlet pipe is equipped with a check valve. The outlet of the heavy oil outlet pipe and the outlet of the diesel branch pipe are connected to the oil guide pipe via a three-way pipe. An electric temperature control valve is installed on the steam inlet pipe of the steam heater. The oil guide pipe is equipped with a first temperature sensor. A temperature sensor and an electric temperature control valve are respectively connected to the controller, the first temperature sensor transmits a temperature signal to the controller, the controller transmits the signal to the electric temperature control valve, thereby realizing the control of the steam flow entering the steam intake pipe, a second temperature sensor and an alarm are installed on the oil guide pipe, the second temperature sensor and the alarm are respectively connected to the controller, the second temperature sensor transmits a temperature signal to the controller, the controller transmits the temperature signal to the alarm, the alarm alarms the temperature exceeding the setting in the controller, the pneumatic three-way ball valve is connected to the controller, the controller is connected to the oil supply unit, the oil supply unit transmits a signal of diesel or heavy oil to the controller, and the controller controls the switching action of the pneumatic three-way ball valve; (3) Install the oil supply conversion unit for the ship's main engine and generator: connect the inlet A of the pneumatic three-way ball valve to the oil supply branch pipe, and connect the oil guide pipe to the oil inlet of the generator; (4) Conversion control: After installation according to step (3), there are two conversion modes, diesel mode and heavy oil mode. In heavy oil mode, the AB port of the pneumatic three-way ball valve is open, and in diesel mode, the AC port of the pneumatic three-way ball valve is open.

2. A method for solving different fuel viscosity requirements of ship main engine and generator according to claim 1, characterized in that The specific steps of the conversion control in step (4) are as follows: when the ship is started, in order to achieve a quick start, diesel needs to enter the generator. Therefore, at this time, the AC port of the pneumatic three-way ball valve is open, and the diesel enters the oil guide pipe through the diesel branch pipe and finally enters the generator. After the ship is started, during the voyage, in order to save costs, heavy oil is needed to work. At this time, the AB port of the pneumatic three-way ball valve is open, and the oil inlet valve is opened. At this time, the heavy oil enters the steam heater for heating. When the temperature of the heavy oil discharged after heating reaches 140°C, the first temperature sensor transmits a signal to the controller, and the controller transmits a signal to the electric temperature control valve. The electric temperature control valve stops opening, and steam continues to enter the steam heater according to the current flow rate. At this time, the heavy oil is stably heated to 140°C and is not further heated. The heavy oil enters the oil guide pipe through the heavy oil outlet pipe and finally enters the generator. For use, when the ship needs to dock, in order to retain diesel in the pipeline, 1-2 hours before docking, the AC port of the pneumatic three-way ball valve is opened, and the diesel enters the oil pipe through the diesel branch pipe and finally enters the generator, ensuring that the oil retained in the oil pipe is diesel, which is convenient for the next quick start of the ship. Since a second temperature sensor is provided on the oil pipe, the temperature of the second sensor is set to 45°C. When the pneumatic three-way ball valve is converted to the AC port, when the temperature on the oil pipe exceeds 45°C, the second temperature sensor transmits a signal to the controller, and the controller transmits a signal to the alarm. The alarm sounds, indicating that the pneumatic three-way ball valve is converted to the AC port but not opened, but the AB port is opened, the diesel is heated, and then an alarm is sounded to remind the operator to check whether the conversion action of the pneumatic three-way ball valve is correct to avoid the risk of diesel heating caused by misoperation.

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