KR-20260063027-A - ship fuel oil heating system of series type using steam and electric heater

KR20260063027AKR 20260063027 AKR20260063027 AKR 20260063027AKR-20260063027-A

Abstract

The present invention relates to a ship fuel preheating system for preheating fuel oil supplied from a ship's fuel tank and supplying it to a driving means, comprising: a first preheating tank preheated by a first preheating means equipped with a steam heat transfer tube that heats the fuel oil inside by steam supplied by boiler operation, and is connected to the fuel tank via piping; a second preheating tank preheated by a second preheating means equipped with an electric heating heat transfer tube that heats the fuel oil inside by power supply, and is connected to the first preheating tank via piping in series with the first preheating tank; a first bypass pipe section that selectively opens and closes by connecting the fuel tank and the inlet piping of the second preheating tank by bypassing the first preheating tank; a second bypass pipe section that selectively opens and closes the outlet piping of the first preheating tank and the driving means by bypassing the second preheating tank; and a specific gravity sensor provided at the inlet side of the driving means to detect the specific gravity of the fuel oil. It is desirable to understand that it includes a control unit that controls the operating state of the first bypass pipe section and the second bypass pipe section, the first preheating tank and the second preheating tank.

Inventors

강호근
전종삼

Assignees

국립한국해양대학교산학협력단
이엔아이테크 주식회사

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (12)

In a ship fuel preheating system that preheats fuel oil supplied from a ship's fuel tank and supplies it to a driving means, A primary preheating tank connected to the above fuel tank and piping, which preheats the fuel oil inside by a first preheating means; A second preheating tank connected to the above-mentioned first preheating tank via piping, wherein the fuel oil inside is preheated by a second preheating means; A first bypass pipe section that selectively opens and closes by connecting the fuel tank and the inlet piping of the secondary preheating tank by bypassing the primary preheating tank; and A ship fuel preheating system comprising a second bypass pipe section that is selectively opened and closed by connecting the outlet-side piping of the first preheating tank and the driving means by bypassing the second preheating tank.
In Article 1, A ship fuel preheating system characterized by the above-mentioned first preheating tank and the above-mentioned second preheating tank being connected in series via piping.
In Article 2, A ship fuel preheating system characterized in that the first preheating means is a steam heat transfer tube heated by steam supplied by the operation of a boiler.
In Article 2, A ship fuel preheating system characterized in that the above-mentioned second preheating means is an electric heating tube heated by power supply.
In Article 2, A first shut-off valve that selectively opens and closes the inlet side of the above-mentioned first preheating tank, and A second shut-off valve that selectively opens and closes the first bypass pipe section, and A third shut-off valve that selectively opens and closes the inlet side of the second preheating tank, and A fourth shut-off valve that selectively opens and closes the second bypass pipe section, and Inlet side of the above driving means A ship fuel preheating system characterized by further including a control unit that controls the opening and closing state of the first to fourth opening and closing valves.
In Article 5, At the inlet side of the above driving means A temperature sensor for detecting the temperature of the above fuel oil, and A ship fuel preheating system characterized by being equipped with a specific gravity sensor that detects the specific gravity of the fuel oil.
In Article 6, The above control unit When the operation of the first preheating means is stopped, the first shut-off valve is closed and the second shut-off valve is opened, and the control is made to a first bypass state. A ship fuel preheating system characterized by controlling the third shut-off valve and the fourth shut-off valve to a second bypass state when the second preheating means is in operation.
In Article 7, The above control unit, when the specific gravity detected by the specific gravity sensor is greater than or equal to a preset value Controlling to a first bypass release state by opening the first shut-off valve and closing the second shut-off valve, and A ship fuel preheating system characterized by controlling to a second bypass release state by opening the third shut-off valve and closing the fourth shut-off valve.
In Article 8, The above control unit, when the specific gravity detected by the specific gravity sensor is greater than or equal to a preset value A ship fuel preheating system characterized by controlling the first preheating means and the second preheating means to operate simultaneously.
In a ship fuel preheating system that preheats fuel oil supplied from a ship's fuel tank and supplies it to a driving means, The first preheating tank, which is connected to the fuel tank and piping and preheated by a first preheating means equipped with a steam heat transfer tube that heats the fuel oil inside by steam supplied by the operation of a boiler; The second preheating tank, which is piping-connected in series with the first preheating tank and preheated by a second preheating means equipped with an electric heating tube that heats the fuel oil inside by power supply; A first bypass pipe section that selectively opens and closes by connecting the fuel tank and the inlet piping of the secondary preheating tank by bypassing the primary preheating tank; A second bypass pipe section that selectively opens and closes by connecting the outlet-side piping of the first preheating tank and the driving means by bypassing the second preheating tank; A specific gravity sensor provided at the inlet side of the above driving means for detecting the specific gravity of fuel oil; and A ship fuel preheating system comprising a control unit that controls the operating state of the first bypass pipe section and the second bypass pipe section, the first preheating tank and the second preheating tank.
In Article 10, The above control unit During the operation of the above vessel, the first preheating means is driven and the fuel oil is controlled to the second bypass state so as to bypass the second preheating tank, and A ship fuel preheating system characterized by driving the second preheating means while the ship is anchored and controlling the fuel oil to the first bypass state so as to bypass the first preheating tank.
In Article 11, The above control unit When the specific gravity detected by the specific gravity sensor is greater than or equal to a preset value, the fuel oil is controlled to pass through the first preheating tank and the second preheating tank sequentially in the first bypass release state and the second bypass release state, and A ship fuel preheating system characterized by controlling the first preheating means and the second preheating means to operate simultaneously.

Description

Ship fuel preheating system {ship fuel oil heating system of series type using steam and electric heater} The present invention relates to a ship fuel preheating system, and more specifically, to a ship fuel preheating system using steam and an electric heater that operates compactly and efficiently. Generally, heavy oils such as bunker fuel oil, which are used as fuel for marine engines, have high viscosity at room temperature, significantly lower fluidity compared to diesel oil, and have very high ignition points. Therefore, in order to increase the fluidity of marine fuel oil, the fuel oil must be preheated to a certain temperature to satisfy the viscosity (10 to 15 cst) and ignition point required by the engine. To this end, a fuel oil heating system using high-temperature steam was installed and used on ships. Figure 1 is a block diagram showing a conventional ship fuel oil preheating system. As shown in FIG. 1, the conventional ship fuel oil heating system operated a system in which a steam heater heat exchanger (10) using steam generated through boiler heating and an electric heater heat exchanger (20) using electricity were connected in parallel. That is, during the operation of the ship, steam is generated from high-temperature exhaust gas produced from a boiler or economizer, and after preheating the ship fuel supplied from the fuel tank (5) to a predetermined temperature in the steam heater heat exchanger (10) into which the steam is introduced, it is supplied to a driving means (30) including a main engine and a generator. In addition, in cases where it is difficult to generate steam, such as when the ship is anchored, a system was operated to preheat the fuel stored in the fuel tank (5) by an electric heater heat exchanger (20) that is heated by heat conduction by a heating wire, and then supply it to a driving means (30) including the main engine and generator. However, in the conventional system, each heat exchanger (10, 20) was controlled by a control unit (40) so that the viscosity of the fuel oil stored in the fuel tank (5) was heated only based on the temperature detected by the temperature sensor (41). The types of fuel oil mainly used in existing ships had different viscosities, such as bunker oil with a viscosity of 180 cSt and bunker oil with a viscosity of 380 cSt, and there was a problem that when different bunker oils were injected at intermediate stops, the heating temperature had to be reset by a ship engineer due to a change in the viscosity of the fuel oil. Furthermore, in conventional systems, the steam heater heat exchanger and the electric heater heat exchanger were installed in parallel to use the steam heater heat exchanger during navigation and the electric heater heat exchanger during anchoring. However, in vessels with narrow beams, such parallel arrangement of the devices was difficult, and there were problems with the difficulty of rapid response in the event of an accident. In addition, when the steam heater heat exchanger and the electric heater heat exchanger are installed in parallel, two sets of heat exchange tanks, piping, and control valves must be installed for preheating fuel oil, as the two heat exchangers are operated separately depending on the condition of the ship, and a circulation device according to the set temperature must be installed separately. As a result, the system becomes complex, increasing the volume of the device and requiring a relatively large number of parts, which leads to increased manufacturing costs. FIG. 1 is a block diagram of a conventional ship fuel preheating system. FIG. 2 is a block diagram of a ship fuel preheating system according to an embodiment of the present invention. FIG. 3 is a flowchart showing a control method for a ship fuel preheating system according to an embodiment of the present invention. Hereinafter, a series-type ship fuel preheating system using steam and an electric heater according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. FIG. 2 is a block diagram of a ship fuel preheating system according to an embodiment of the present invention. As shown in FIG. 2, the ship fuel preheating system is a device for preheating the fuel oil supplied from the ship's fuel tank (105) and supplying it to a driving means, and includes a first preheating tank, a second preheating tank, a first bypass pipe section (111), and a second bypass pipe section (121). Here, the fuel oil contained in the fuel tank (105) includes HFO (Heavy Fuel Oil), MGO (Marine Gas Oil), MDO (Marine Diesel Oil), etc. In particular, it is desirable to understand that heavy oil with a viscosity of 63 cSt or higher at 50°C is used as VLSFO (Very Low Sulfur Fuel Oil). In addition, the fuel tank (105) includes a settling tank and a service tank. At this time, fuel oil discharged from the engine fuel oil main tank is stored in the settling tank, and fuel oil discharged from the sett