JP2014031788A - Cleaner heating system of fuel oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that, in a small-sized ship, fuel oil transferred from a fuel oil storage tank has high viscosity while being supplied to a fuel oil settling tank at a low temperature of 25 to 35°C, such a state that heating cannot reach a preset temperature according to natural convection of the fuel oil is incurred and the fuel oil discharged from the fuel oil settling tank causes abrupt temperature change/drop to result in a temperature fall of the fuel oil which cannot be solved by a cleaner heater.SOLUTION: In a fuel oil cleaner heating system of a small-size ship, fuel oil properly heated by combining heating means (in claim 1) which heats fuel oil outputted from a fuel oil settling tank 38 while mixing the fuel oil with heated fuel oil outputted from a diesel engine 60 and heating means (in claim 2) which circulates a part of the heated fuel oil outputted from a cleaner supply pump 44 from a circulating pipe line 48 to a pipe line 41 of the fuel oil settling tank 38 and performs mixing and heating is supplied to a fuel oil cleaning device 49, and the cleaned fuel oil is supplied to a fuel oil common use tank 52 through a pipe line.

Description

  The present invention relates to a fuel oil purifier heating device for use in a diesel engine of a small vessel.

  In small vessels, the viscosity and properties of the fuel oil supplied to the diesel engine are required. In any case, the fuel oil must be heated to an appropriate temperature. It is important to control the temperature of the fuel oil in order to maintain the viscosity at the inlet of the centrifuge used for property treatment. The fuel oil from the fuel oil tank is heated to an appropriate temperature with a purifier heater and used as a fuel oil purifier. The present invention relates to a fuel oil cleaning and heating system that supplies, cleans, and supplies fuel oil to a fuel oil service tank.

  As shown in a schematic system diagram of a conventional fuel oil purifier heating system in FIG. 1, the fuel oil in the fuel oil tank 13 is continuously sent to a purifier heater 19 through a pipe 17 by a purifier supply pump 18. The fuel oil purifier 21 is heated to the set temperature and supplied to the fuel oil purifier 21 through the pipe 17. The processing amount is adjusted by the flow rate adjusting valve 22 downstream of the fuel oil purifier 21, and the cleaned fuel oil passes through the pipe 23. The fuel oil regular tank 24 is supplied.

Patent application 2006-168094 Fuel oil supply device JP-A 07-317614 Fuel oil transfer device

Utility Model Reference 3

Shokai 58-169144 Fuel oil supply system

Utility Model Reference 4

Sho 59-39757 Fuel oil heating system

Non-patent literature

Guidelines for Fuel Oil and Lubricating Oil for Coastal Ship 4 Cycle Main Engines Japan Marine Manufacturers Association

  [Non-Patent Document 1] Recent marine fuel oil (C heavy oil) tends to use a larger amount of cracked residue oil, and is becoming heavier and lower in quality. As reported, the fuel used is getting worse and the importance of fuel oil cleaning treatment is increasing.

  In the schematic system diagram of the conventional fuel oil purifier heating system shown in FIG. 1, the fuel oil storage tank 10 is heated to a temperature (25 ° C. to 35 ° C.) at which the suction limit viscosity of the fuel oil transfer pump 12 is reached. The fuel oil tank 13 that receives the temperature of the fuel oil is heated by the liquid tank heater 16, but the temperature of the fuel oil is low and the capacity per hour is large while the fuel oil is being replenished. As the temperature decreases and the viscosity increases and the natural convection of the fuel oil does not catch up with the set temperature, the fuel oil discharged from the fuel oil clarifier tank 13 undergoes a rapid temperature change / decrease, and the purifier heater 19 Then, it is in the situation where heating cannot catch up.

  FIG. 2 is a graph showing the results of actual ship measurements to verify this actual condition. When described with reference to FIG. 2, the vertical axis 1 of the graph in FIG. 2 indicates the heating temperature, the horizontal axis 2 indicates the elapsed time, and a broken line. 3 indicates the wall temperature of the fuel oil tank 13, and the broken line 4 indicates the outlet temperature of the fuel tank 13.

  The broken line 3 shown in the graph of FIG. 2 is considered to be heated to the set temperature of about 70 ° C. of the clarifier tank heater 16 by the wall surface temperature of the fuel oil clarifier tank 13, and the heating is uniform with almost no temperature change. However, the broken line 4 indicates that the measured value of the temperature of the fuel oil flowing from the fuel oil tank 13 to the pipe 17 in the middle of the cleaner supply pump 18 is the fuel oil in the fuel oil storage tank 10 During the replenishment of the oil tank 13, the temperature suddenly decreases. When the supply is stopped, the outlet temperature of the fuel oil tank 13 gradually rises to nearly 70 ° C. The fuel at the outlet of the fuel oil tank 13 The temperature change of the oil temperature varies greatly from 50 ° C to 70 ° C.

As an example of a conventional total-ton 499-ton cargo ship, the heat balance concept is that when a fuel oil temperature of 30 ° C. is supplied from a fuel oil storage tank, a temperature drop of about 5 ° C. occurs when the set temperature is 65 ° C. The outlet temperature from the fuel oil tank is t1 = 60 ° C, the supply amount of the cleaner is 520 (L / h), and the set temperature t2 = 95 ° C. The electric capacity kW / h required for heating is calculated by the following formula. ing.
H (kj / h) = Qf * sg * sh * (t2-t1)
Qf: 0.52m3 / h
sg: 980 kg. m3
sh: 1.881 kj / kg. K
t2: 95 ° C
t1: 60 ° C
H = 0.52 × 980 × 1.881 × (95−60) = 33550 kj / h
Kw = H / (0.85 × 3600) = 33550/3060
= 10.96kW / h
The required power is 11 kW, and the actual ship is generally equipped with a purifier heater (12 kW).

However, when the outlet temperature of the fuel oil tank reaches t1 = 50 ° C. , the electric capacity kW / required for heating when the set temperature t2 = 95 ° C. with the cleaner supply amount 520 (L / h). When h is calculated by the following formula,
H (kj / h) = Qf * sg * sh * (t2-t1)
Qf: 0.52m3 / h
sg: 980 kg. m3
sh: 1.881 kj / kg. K
t2: 95 ° C
t1: 50 ° C
H = 0.52 × 980 × 1.881 × (95-50) = 43235 kj / h
Kw = H / (0.85 × 3600) = 43235/3060
= 14.13kW / h

  If the temperature of the fuel oil discharged from the fuel oil tank is suddenly lowered, the calculation result also results in an insufficient amount of heat. With a required power of 14.13 kW, the fuel oil is supplied with a cleaner heater 12 kW equipped in a conventional small ship. The heating temperature becomes up to about 85 ° C., and the fuel oil set temperature t2 cannot be maintained at 95 ° C.

  Even if the fuel oil in the fuel oil tank 13 is 60 ° C. to 70 ° C., the viscosity is high, and the fuel oil from the fuel oil storage tank 10 does not have a uniform temperature and does not have a uniform temperature. While the clarifier tank 13 is being replenished, the temperature of the fuel oil coming out of the fuel oil clarifier tank 13 rapidly decreases, and it takes time to reach the original temperature. Therefore, it is important to keep the viscosity of the fuel oil low. If the temperature of the supplied fuel oil is unstable, the temperature of the fuel oil also affects the viscosity and the properties deteriorate.

[Non-Patent Document 1] In the conventional fuel oil heating system, between the fuel oil storage tank and the fuel oil tank, between the fuel oil tank and the fuel oil tank, from the fuel oil tank to the diesel engine, Although the temperature of the fuel oil is controlled by heating sequentially for each step, if the temperature control cannot be maintained at one step, the overall heat balance is lost.

  The point of the present invention is that the fuel oil after being used in a diesel engine having a high temperature and sufficient heat quantity and oil quantity in order to supply the temperature of the fuel oil supplied to the cleaner in a stable state with little fluctuation. Realizing stable temperature control in a fuel oil purifier heating system that keeps temperature changes to a minimum by making maximum use of thermal energy stabilizes the overall heat balance, and makes the fuel oil viscosity and good properties. The purpose is to supply diesel engines.

Means to solve the problem

In order to achieve the above-mentioned object, according to the present invention, there is a pipe through which fuel oil from a diesel engine passes during a voyage, between fuel oil regular tanks that receive the fuel oil from a fuel oil tank heated and cleaned. A part of the fuel oil branched off from the middle of the path is provided with an outlet of a pipe provided with a power flow control valve in the middle, an outlet of a pipe through which the fuel oil from the fuel oil tank passes, and the respective pipes The fuel oil that has joined and connected to the outlet of the gas passes through the pipe provided with the temperature sensor, is supplied to the purifier supply pump, and the temperature sensor and the power flow control valve are connected to the controller, and flows through the power flow control valve. The flow rate of the fuel oil is automatically controlled by the controller so that the difference between the measured temperature passing through the temperature sensor and the set temperature matches.

  According to the first aspect of the present invention, during the voyage, a conventional purifier heater is not required, and the amount of low-temperature fuel oil supplied from the fuel oil tank and the diesel engine The total amount of oil that passes through the power flow control valve at a high temperature with sufficient capacity is almost constant in the suction amount of the cleaner supply pump, and the fuel oil that comes out of the diesel engine has the power flow rate If the adjustment valve is throttled, the amount of oil decreases, the amount of fuel oil from the fuel oil tank increases, the temperature of the fuel oil passing through the temperature sensor decreases, and conversely, the power flow adjustment valve is turned off. If it is opened, the amount of fuel oil coming out of the diesel engine increases, the temperature of the fuel oil passing through the temperature sensor rises, and the temperature sensor is changed by changing the flow rate of the fuel oil coming out of the diesel engine with the power flow control valve. Passing fuel oil is set at the same time as mixing By providing a controller that can adjust the power flow rate adjusting valve automatically so that the fuel oil heating temperature set value matches the fuel oil temperature passing through the temperature sensor. By finely adjusting the flow rate, it can be adjusted to a stable temperature and viscosity and supplied to the fuel oil purifier.

According to a second aspect of the present invention, there is provided the fuel oil purifier heating system according to the first aspect, wherein the processing amount of the fuel oil discharged from the fuel oil supply pump made larger than the processing amount of the fuel oil purifier is the fuel oil. The fuel oil that has been supplied to the cleaning device and cleaned is supplied to the fuel oil tank, and surplus fuel oil from the fuel oil supply pump branches off from the middle of the pipe downstream of the fuel oil supply pump outlet. And a pipe through which the fuel oil from the fuel oil tank passes, and the low temperature fuel oil coming out of the fuel oil tank and the heated surplus fuel oil are mixed and heated.

According to the second aspect of the present invention, the capacity of the purifier supply pump is set to be larger than the processing amount of the fuel oil purifier, and fuel oil from the fuel tank is separated from fuel oil from a diesel engine. A portion of the fuel oil that has been mixed and adjusted to the set temperature is mixed with the low-temperature fuel oil that exits from the fuel oil tank via the branched pipe downstream of the cleaner supply pump, and heated and circulated. Thus, the fuel oil at the outlet of the fuel oil tank is heated.

Effect of the invention

According to the heating means of claim 1 of this fuel oil purifier heating system, the low temperature fuel oil supplied from the fuel oil tank is not required during the voyage and the purifier heater is not required. The fuel oil with a sufficient capacity at high temperature coming out of the diesel engine is mixed with the fuel oil passing through the power flow control valve and can be adjusted to the set temperature almost simultaneously. The power flow control valve is automatically controlled by the controller so as to coincide with the passing fuel oil temperature.

  In the heating means according to claim 2, a part of the heated fuel oil passes through the branch pipe branched from the upstream of the outlet of the cleaner supply pump, and is mixed and mixed with the low temperature fuel oil supplied from the fuel oil tank. And heated as fuel oil at the outlet of the fuel oil tank in claim 1.

  In the present invention, the heating means according to claim 1 and the heating means according to claim 2 are combined so that the fuel oil is discharged quickly from the fuel oil tank and is rapidly heated and stabilized. Automatic control to temperature, adjustment to optimum viscosity, and supply to a fuel oil purifier

  The speed of response to the temperature drop of the fuel oil coming out of the fuel oil tank can be increased so that the temperature fluctuation of the fuel oil supplied to the fuel oil purifier is small, and the properties of the purified fuel oil from the fuel oil purifier are stable. Can be supplied to diesel engines in

FIG. 6 is a schematic system diagram of a fuel oil purifier heating system for a small vessel according to a conventional embodiment. The temperature of the fuel oil from the fuel oil tank of the small ship which concerns on the conventional embodiment is measured, and it graphs. 1 is a schematic system diagram of a fuel oil purifier heating system for a small vessel according to an embodiment of the present invention. It is the graph which put together according to claim 1 which concerns on embodiment of this invention according to the fuel oil temperature which flowed out the fuel oil from a diesel engine, and the fuel oil from a fuel oil tank from the fuel oil tank. The fuel oil outlet temperature from a fuel oil tank combines the claim 1 and 2 which concern on embodiment of this invention, and is the graph which calculated | required the balance temperature. It is the graph which calculated | required the balance temperature by changing the fuel oil exit temperature from a fuel oil tank by combining Claim 1 and 2 which concern on embodiment of this invention.

In small vessels, the fuel oil of a diesel engine is generally A heavy oil when entering and leaving the port, and C heavy oil is used during voyage. The fuel oil needs to be heated when C heavy oil is used.
In the process of supplying fuel oil to a diesel engine, low-temperature oil is used for optimal fuel heating and fuel oil treatment, with the optimum viscosity at the time of fuel injection to obtain good fuel oil injection and combustion The viscosity at the inlet of the centrifuge is important, and the fuel oil temperature control for maintaining the viscosity is important.

  In the past, fuel oil was heated and raised sequentially by stage using a fuel oil heater, a purifier heater, a fuel oil tank additional heater, and a fuel oil regular tank additional heater. Contrary to conventional cases, the fuel oil supplied to the diesel engine is first heated, supplied to the diesel engine, and the heat energy of the fuel oil deducted from the fuel consumption consumed by the engine is used to obtain a predetermined temperature. This is a system for heating fuel oil.

  The basis of the present invention is that the low temperature fuel oil from the fuel oil clearing tank is mixed with the heated fuel oil and the fuel oil supplied to the cleaner in response to a sudden temperature change is brought to an appropriate temperature. It is in heating control.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
The schematic system of the fuel oil purifier heating system according to the embodiment of the present invention will be described with reference to FIG. 3. The fuel oil described here indicates C heavy oil.

  According to the present invention, the fuel oil exiting from the fuel oil tank 38 is mixed with the heated fuel oil exiting from the diesel engine 60 and heated to a set temperature. A part of the heated fuel oil that has exited is recirculated from the pipe 48 to the pipe 41 to be mixed and heated, and combined with the heating means of claim 2 to supply the fuel oil properly heated to the fuel oil cleaning device 49 for cleaning. The supplied fuel oil is supplied to the fuel oil regular tank 52 through the pipe 51.

  The heating means according to the first aspect of the present invention comprises an electric type in the middle of a pipeline 42 branched from a pipeline 61 from the diesel engine 60 in a pipeline 41 leading to the suction port of the fuel oil tank 38 and the cleaner supply pump 44. A flow rate adjusting valve 43a is provided, connected to the pipe line 41 from the fuel oil tank 38, and a temperature sensor 43b is provided in the pipe line 43 connecting the connection point to the purifier supply pump 44. While the fuel oil from 38 is supplied to the cleaner supply pump 44 via the line 41, a portion of the fuel oil leaving the diesel engine 60 is The process of passing through the flow rate adjusting valve 43a and connecting to the pipe line 41 through which the fuel oil from the fuel oil tank 38 flows, and the mixed fuel oil is sucked by the cleaner supply pump 44 through the temperature sensor 43b The temperature sensor 43 Flow rate of the electric type flow control valve 43a to the passage temperature matches the set temperature is controlled via a controller 43c.

  The heating means of claim 2 is divided into two parts by the fuel oil heated by the heating means of claim 1 from the cleaner supply pump 44 having a capacity larger than the processing amount of the fuel oil cleaning device 49. The fuel oil cleaning device The fuel oil with a processing amount of 49 passes through the standby heater 50 of the electric heater type and is sent to the fuel oil cleaning device 49, and the remaining fuel oil passes through the pipe line 48 branched from the pipe line 47 and passes through the pipe line 48. The fuel oil discharged from the oil tank 38 is mixed and heated, and is supplied again to the heating means of claim 1, and the fuel is supplied from the purifier supply pump 44 through the pipe 47 to the standby heater 50. The purified fuel oil supplied to the oil cleaning device 49 passes through the flow rate adjusting valve 49a, passes through the pipeline 51, and is supplied to the fuel oil regular tank 52.

  An overflow pipe 53 is provided from the fuel oil regular tank 52 to the fuel oil tank 38, and the fuel oil in the fuel oil regular tank 52 is fed from the fuel oil purifier 49 by the amount of fuel oil passing through the pipe 54. When the supply amount of fuel is large, the liquid level rises and the fuel oil reaching the high liquid level is recirculated to the fuel oil tank 38 via the overflow pipe 53 to constitute the fuel oil purifier heating system. .

  In the above system, the standby heater 50 is used at the time of preparation for heating (at the time of standby) in which the C heavy oil in the fuel oil tank and the fuel oil regular tank can be used while using the A heavy oil at the time of leaving the port or at the time of berthing. .

これに数値をいれると
Ｖａ＋Ｖｂ＝７００ Ｖａ＝７００−Ｖｂ
（７００−Ｖｂ）３０＋Ｖｂ×１１５＝７００×９５
Ｖｂ＝５３５（Ｌ／ｈ）
Ｖａ＝７００−Ｖｂ Ｖａ＝７００−５３５＝１６５（Ｌ／ｈ）
該燃料油澄タンク３８からの燃料油の流量Ｖａ＝１６５（Ｌ／ｈ）
該ディーゼル機関６０からの燃料油の流量Ｖｂ＝５３５（Ｌ／ｈ）となる
該燃料油澄タンク３８からの燃料油温度Ｔａ＝３０℃であっても図４のグラフに示すように加熱後の設定温度Ｔｃ＝９５℃，流量Ｖｃ＝７００（Ｌ／ｈ）と加熱が可能である。The heat balance of the heating means according to claim 1 will be described with an example.
The temperature and flow rate are
Fuel oil temperature Ta from the fuel oil tank 38 = 30 ° C., flow rate Va (L / h),
Fuel oil temperature Tb = 115 ° C. from the diesel engine 60, flow rate Vb (L / h)
When the set temperature Tc after heating is 95 ° C. and the flow rate Vc of the cleaner supply pump 44 is 700 (L / h),
The fuel oil flow rate Va (L / h) from the fuel oil tank 38 and the fuel oil flow rate Vb (L / h) from the diesel engine 60 are:
It can be obtained from the following simultaneous equations 1.0.

If you put a numerical value in this, Va + Vb = 700 Va = 700-Vb
(700−Vb) 30 + Vb × 115 = 700 × 95
Vb = 535 (L / h)
Va = 700−Vb Va = 700−535 = 165 (L / h)
Flow rate Va of fuel oil from the fuel oil tank 38 = 165 (L / h)
Even after the fuel oil temperature Ta = 30 ° C. from the fuel oil tank 38 where the flow rate Vb of the fuel oil from the diesel engine 60 is 535 (L / h), as shown in the graph of FIG. Heating is possible with a set temperature Tc = 95 ° C. and a flow rate Vc = 700 (L / h).

  According to the heating means of the second aspect, the fuel oil of the difference between the cleaning amount of the fuel oil cleaning device 49 and the capacity of the cleaner supply pump 44 passes through the pipe line 48 and the fuel discharged from the fuel oil tank 38. The fuel oil mixed and reheated is supplied again to the fuel oil mixing and heating circuit of the heating means of claim 1, whereby the fuel oil flow rate Va from the fuel oil tank 38 is increased and Vb is decreased. The amount of fuel oil passing through the circulation pipe 48 can be adjusted by a flow rate adjusting valve 49 a provided in the fuel oil cleaning device 49.

  The heat balance of the heating means of the second aspect will be described with an example. When the processing amount of the fuel oil cleaning device 49 is adjusted to 600 (L / h) by the flow rate adjusting valve 49a, When the capacity Vc = 700 (L / h) to the processing amount Vd = 600 (L / h), Ve = 100 (L / h) flows at the flow rate Ve = Vc−Vd of the pipe line 48.

  The circulation line 48 has a flow rate Ve = 100 (L / h) and a fuel oil temperature Tc = 95 ° C., where Va = 165 (L / h) at the junction with the flow line 41. When the fuel oil temperature of 95 ° C. is mixed at a flow rate of 100 (L / h) and the fuel oil temperature of 30 ° C. is mixed at a fuel oil flow rate of 65 (L / h) from the fuel oil tank, the graph of FIG. The initial values shown once rise to Va = 165 (L / h) and Ta = 69.3 ° C.

However, in the heating means of claim 1, when the fuel oil temperature Ta rises, the flow rate Va also increases, the ratio of the fuel oil 30 ° C. from the fuel oil tank 38 increases, and the heating temperature decreases.
Tb = 115 ° C. Tc = 95 ° C. When Vc = 700 (L / h) and Ta is changed from 30 ° C. to 70 ° C., Va and Vb are obtained. As shown in the graph of FIG. 4, the temperature of Ta is low. In this case, the flow rate Va decreases and the Vb increases.

The fuel oil temperature Te at the merging point when Ta is set at a temporary set temperature of 40 ° C., 50 ° C., 60 ° C., 70 ° C. and the flow rate of the circulation line 48 is 100 (L / h) constant. Is obtained from the graph of FIG. 4 as the temperature Te of the intersection when the flow rate of fuel oil from the fuel oil tank and Va-100 (L / h) is Ta.
Ta = 30 ° C., Va = 165 (L / h), Te = 69.3 ° C.
Ta = 40 ° C., Va = 187 (L / h), Te = 64.7 ° C.
Ta = 50 ° C., Va = 215 (L / h), Te = 60.2 ° C.
Ta = 60 ° C., Va = 255 (L / h), Te = 55.4 ° C.
Ta = 70 ° C., Va = 311 (L / h), Te = 50.9 ° C.
5 where the calculated set temperature is balanced at a temperature of 57 ° C., and the value obtained by calculating the flow rate at that time with Equation 1.0 is Va = 241 (L / h) ), Vb = 459 (L / h).

As shown in the graph of FIG. 6, the fuel oil tank 38 outlet temperature and the temperature balanced by the heating means in claim 1 are shown.
When the temperature of the fuel oil coming out of the fuel oil tank 38 is 30 ° C., the balance temperature is 57 ° C. and the heating temperature difference is 27 ° C.
When the temperature of the fuel oil discharged from the fuel oil tank 38 is 50 ° C., the balance temperature is 65.9 ° C., and the heating temperature difference is 15.9 ° C.
When the temperature of the fuel oil discharged from the fuel oil tank 38 is 55 ° C., the balance temperature is 68.6 ° C. and the heating temperature difference is 13.6 ° C.
When the temperature of the fuel oil coming out of the fuel oil tank 38 is 60 ° C., the balance temperature is 71 ° C., and the temperature difference is 11 ° C.
The temperature at which the temperature of the fuel oil coming out of the circulation pipe 48 and the fuel oil tank 38 is mixed and balanced becomes higher when the temperature of the fuel oil from the fuel oil tank 38 is lower and becomes abnormally low. Is an effective heating means.

38 Fuel oil tank 41, 42, 43, 47, 48, 51, 54, 61 Pipe line 43a Electric flow control valve 43b Temperature sensor 43c Controller 44 Cleaner supply pump 49 Fuel oil cleaning device 49a Flow control valve 50 Standby heating 52 Fuel oil service tank 53 Overflow pipe 60 Diesel engine

Claims (2)

  The fuel oil from the fuel oil tank is heated and cleaned, and is received between the fuel oil service tanks. The fuel oil from the diesel engine branches off from the middle of the pipeline through which the fuel oil passes. A pipeline outlet provided in the middle, a pipeline outlet through which the fuel oil from the fuel oil tank passes, and the fuel oil that joins and joins the respective pipeline outlets pass through a pipeline provided with a temperature sensor, and are cleaned. The temperature sensor and power flow control valve are supplied to the machine supply pump and connected to the controller respectively. The flow rate of the fuel oil flowing through the power flow control valve matches the difference between the measured temperature that passes the temperature sensor and the set temperature. A fuel oil purifier heating system that is automatically controlled by the controller.   2. The fuel oil purifier heating system according to claim 1, wherein the processing amount of the fuel oil discharged from the fuel oil supply pump larger than the processing amount of the fuel oil cleaning device is supplied to the fuel oil cleaning device, and the cleaning processing is performed. The supplied fuel oil is supplied to a fuel oil service tank, and surplus fuel oil from the fuel oil supply pump is branched from the middle of the pipe downstream of the fuel oil supply pump outlet, and from the fuel oil tank. 2. A fuel oil purifier according to claim 1, wherein the fuel oil purifier is connected to a pipe line through which fuel oil passes, and is mixed and heated with the low temperature fuel oil coming out of the fuel oil tank and the heated surplus fuel oil. Heating system.

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