JP6511697B2 - Fuel oil transfer system - Google Patents

Description

  The present invention relates to fuel oil transfer systems, and more particularly to a fuel oil transfer system for transferring fuel oil between fuel oil storage tanks.

Fuel oil used for boilers, such as a ship and a generator, is stored in storage parts, such as a tank, is supplied to an internal combustion engine etc., and is consumed. In addition to fuel oil, lubricating oil intended for a main engine such as an internal combustion engine is also contained and used in a storage part such as a tank, similarly to fuel oil.
The storage part of the fuel oil and lubricating oil used for ships may be prepared several tanks according to the kind of property, a different storage amount, etc. (for example, patent document 1).
Patent Document 1 discloses a configuration in which one of a plurality of tanks storing lubricating oils of different properties is selected when replenishing lubricating oil reduced by consumption in an internal combustion engine.
It is selected from lubricating oils with different properties to prevent the shortage of lubricants that cause deterioration of the operating conditions in the internal combustion engine by supplying a lubricant that matches the properties of the lubricating oil in the internal combustion engine It is.

Although the configuration disclosed in Patent Document 1 is different from fuel oil, the concept is common to fuel oil in that substances supplied to the internal combustion engine are supplied from a plurality of tanks.
However, the configuration disclosed in Patent Document 1 is premised on selecting any of the plurality of tanks, and it is considered that the objects having the same property as the fuel oil are transferred between the tanks. It is not done.
As a result, a small amount of fuel oil remaining in the tank is left unconsumed, which is a disadvantage for energy saving that suppresses waste of fuel consumption.

JP, 2015-86866, A

  Then, the subject of this invention is providing the fuel oil transfer system which can suppress that waste arises in consumption of the fuel oil currently stored by the several tank. In particular, it is an object of the present invention to provide a fuel oil transfer system capable of transferring fuel oil while preventing increase in viscosity and flow resistance of the fuel oil when transferring fuel oil between a plurality of tanks.

  In order to solve this problem, the present invention heats the fuel oil transferred by the transfer pump from one of the plurality of fuel oil storage tanks by the fuel oil clear tank, and heats the heated fuel oil by the down flow pump. The fuel oil transfer system according to claim 1, wherein the temperature of the fuel oil in the fuel oil storage tank can be partially increased by returning to the fuel oil storage tank and mixing with the fuel oil in the fuel oil storage tank. When the fuel oil storage tank is a transfer source and the other is a transfer destination fuel oil storage tank, the fuel oil clear tank to the transfer destination fuel oil storage tank or the fuel oil clear tank to the transfer pump fuel A first auxiliary inflow pipe capable of transferring fuel oil to the oil suction side, a second auxiliary inflow pipe communicating between the fuel oil discharge side of the transfer pump and the first auxiliary inflow pipe, and the first auxiliary inflow pipe And a bypass fuel oil passage capable of branching and transferring fuel oil to the transfer destination fuel oil storage tank, and using the first auxiliary inflow pipe when preheating fuel oil of the transfer destination fuel oil storage tank A transfer path for mixing the heated fuel oil of the fuel oil clear tank with the fuel oil of the fuel oil storage tank of the transfer destination, the transfer source using the second auxiliary inflow pipe and the bypass fuel oil path The transfer path for introducing the fuel oil of the fuel oil storage tank to the fuel oil storage tank of the transfer destination is selectable, and the first auxiliary is used when transferring the fuel oil to the fuel oil storage tank to the transfer destination A feature is that a part of the fuel oil of the transfer source is returned to the fuel oil introduction side of the transfer pump using an inflow pipe.

  According to the present invention, since the fuel oil in the fuel oil storage tank can be transferred, there is no fuel left and no waste occurs. In particular, since the flow resistance of the fuel oil can be suppressed at the time of transfer, smooth transfer can be easily performed.

It is a schematic diagram which shows the structure of the fuel oil transfer apparatus used for the fuel oil transfer system which concerns on embodiment of this invention, and the flow of the fuel oil at the time of fuel oil heating. It is a schematic diagram which shows the flow of the fuel oil at the time of the fuel transfer performed with the fuel oil transfer apparatus shown in FIG. It is a block diagram for demonstrating the structure of the control part used for the fuel oil transfer apparatus shown in FIG. It is a diagram for demonstrating the principle used for the predetermined condition determination implemented by the control part shown in FIG. It is a schematic diagram for demonstrating the structure of the fuel oil transfer system supposing the structure shown in FIG. It is a schematic diagram for demonstrating the transfer state of the fuel oil which made the object shown in FIG. 5 object.

Below, the form for implementing this invention is demonstrated.
FIG. 1 is a configuration of a fuel oil transfer device 1 used in a fuel oil transfer system according to a mode for carrying out the present invention.
The fuel oil transfer device 1 includes a fuel oil clear tank 3 and a fuel oil service tank 4 which communicate with a plurality of fuel oil storage tanks 2 including a pair.
The fuel oil purification tank 3 is a tank used to heat the fuel oil, and the fuel oil is heated to a temperature of 70 to 80 ° C., for example, by a heater (not shown).

The fuel oil storage tank 2 and the fuel oil clear tank 3 are communicated with each other by the transfer pipe 5, and the transfer pump 6, the temperature sensor 7 and the pressure sensor 8 are disposed in the middle thereof.
The temperature sensor 7 measures, for example, the temperature on the fuel oil inlet side of the transfer pump 6, that is, the so-called suction side.
The pressure sensor 8 is provided to monitor the pressure change of the fuel oil drawn into the transfer pump 6. The pressure change is used to determine the change in flow resistance in response to the viscosity change of the fuel oil. In particular, when the viscosity increases and the flow resistance increases, the pressure on the inlet side of the transfer pump 6 tends to evacuate. Therefore, if a pressure change with a tendency to vacuum is detected, heating is required to lower the viscosity of the fuel oil.
The fuel oil leveling tank 3 is provided with a level sensor 9 for detecting the level of the fuel oil sucked by the transfer pump 6.
The level sensor 9 is a sensor that can detect the liquid level when a predetermined amount of fuel oil is introduced into the fuel oil clear tank 3. The level sensor 9 is used to stop the driving of the transfer pump 6 when it detects that a predetermined amount of fuel oil has been introduced into the fuel oil clear tank 3.
The sensor is provided not only at the above-described position but also inside the fuel oil storage tank 2 (see FIG. 5). The sensors LG1 and LG2 are remaining amount sensors that detect the remaining amount of fuel in the fuel oil storage tank by level or pressure.

The fuel oil service tank 4 is a tank used for cleaning the heated fuel oil and temporarily storing it to supply the fuel oil to an internal combustion engine or the like. The fuel oil storage tank 2 and the fuel oil service tank 4 are in communication with each other by a suction pipe 10, and a flow down pump 11 is disposed in the middle thereof. A part of the fuel oil stored in the fuel oil service tank 4 is made to flow down to the fuel oil storage tank 2 by the down flow pump 11 to raise the temperature of the fuel oil in the fuel oil storage tank 2.
The name of the flow-down pump 11 in this case is based on the premise that the fuel oil service tank 4 is disposed at a position higher than the fuel oil storage tank 2. In other words, it means that the fuel oil flows out from the upper fuel oil service tank 4 to the lower fuel oil storage tank 2 and is expressed as a down flow.

  In the configuration shown in FIG. 1, a configuration in which the fuel oil clear tank 3 and the fuel oil service tank 4 are in communication with the suction pipe 10 is employed. Therefore, the flow path of the fuel oil outlet of each tank 3, 4 is set so that the flow path of the heated fuel oil from the both tanks 3, 4 or any of the tanks toward the fuel oil storage tank 2 can be set. 12 are provided.

In the fuel oil transfer device 1 described above, the fuel oil sucked from the fuel oil storage tank 2 to the fuel oil clear tank 3 is heated by the transfer pump 6 and the heated fuel oil is cleaned and the fuel oil service tank The fuel oil introduced into 4 and stored is prepared for supply to an internal combustion engine or the like.
A portion of the fuel oil temporarily stored in the fuel oil clear tank 3 and / or the fuel oil service tank 4 is returned to the fuel oil storage tank 2 by the down flow pump 11. As a result, the fuel oil in the fuel oil storage tank 2 is partially heated to 36 to 40 ° C. by being mixed with the heated fuel oil.

In this embodiment, as the operation time of the pumps, for example, the transfer pump 6 is selected for about 15 minutes and the flow-down pump 11 is selected for about 45 minutes to be alternately operated. Of this time, the operating time of the transfer pump 6 can correspond to, for example, the time until the liquid level of the fuel oil is detected by the level sensor 9 in the fuel oil clear tank 3 described above. That is, if the fuel oil level is detected by the level sensor 9 within the operation time when the fuel oil is flowed at a flow rate based on the rating of the rotational speed of the transfer pump 6, drive current, etc. It can be judged that the viscosity of the fuel oil does not occur, and when this operation time is exceeded, it can be judged that the viscosity of the fuel oil is high and the fluidity is bad. When the level sensor 9 detects that the fuel oil introduced into the fuel oil clear tank 3 has reached a predetermined amount, the operation of the transfer pump 6 is stopped to prevent the fuel oil from overflowing.
In addition, when there is no consumption of fuel oil, such as at anchorage, the operation time of the transfer pump 6 is short, and the time until the level sensor 9 operates is, for example, about 6 minutes.

Routes for suctioning the fuel oil from the fuel oil storage tank 2 to the fuel oil clear tank 3 using the transfer pump 6 are indicated by reference signs F1 to F5 in FIG. A route for causing the fuel oil to flow down from the fuel oil service tank 4 to the fuel oil storage tank 2 using the flow-down pump 11 is indicated by arrows F10 to F13 in FIG.
The configuration of the main part of the fuel oil transfer device 1 using such a configuration is disclosed in Japanese Patent Application Laid-Open No. 2012-17123, which is a prior application of the present applicant.

The fuel oil transfer device 1 having the above configuration uses a heating method for suppressing an increase in flow resistance of the fuel oil.
Heating in this case means raising the temperature of the unheated fuel oil by mixing the heated fuel oil with the unheated fuel oil.
Hereinafter, the heating method implemented using a fuel oil transfer apparatus is demonstrated.

The fuel oil transfer device 1 has one of a normal operation mode that is executed when the viscosity of the fuel oil is low and a low flow resistance, and a heating operation mode that is executed when the viscosity is high and the flow resistance increases. It is selectable. The normal operation mode is a mode in which the transfer pump 6 which operates according to the operating state of the level sensor 9 and the down flow pump 11 for supplying the fuel oil into the fuel oil storage tank 2 are alternately operated to circulate the fuel oil. is there. In the heating operation mode, the transfer pump 6 is forcibly stopped, and the fuel oil held on the suction side of the transfer pump 6 is heated, and the fuel oil is stored by the fuel oil returned to the fuel oil storage tank 2 The fuel oil in the tank 2 is also heated. It is desirable that the heating operation mode be performed until the viscosity of the fuel oil retained on the transfer pump 6 side reaches a value that does not increase the flow resistance.
The following parameters are used as data as conditions for executing the heating operation mode.
That is, as parameters, at least the temperature and pressure of the fuel oil drawn into the transfer pump 6 and the operating time of the transfer pump 6 are used. With regard to the operating time of the transfer pump 6, as described above, the operating time until the level sensor 9 operates and the clocked time of the timer provided in the transfer pump 6 itself are referred to. When all or any one or more of these parameters match the predetermined conditions requiring heating, the heating operation mode is executed.

The configuration and operation for executing this operation mode will be described below with reference to FIG.
The operating state of the transfer pump 6 and the down flow pump 11 is controlled by the control unit 20 shown in FIG.

  In the control unit 20, the temperature sensor 7, the pressure sensor 8 and the level sensor 9 provided in the transfer pipe 5 are connected to the input side. The drive unit of the transfer pump 6 and the drive unit of the down flow pump 11 are connected to the output side of the control unit 20, respectively. Each of the transfer pump 6 and the down flow pump 11 is of a type capable of controlling the flow rate or the flow rate by controlling rotation of a motor (members indicated by reference numerals M1 and M2 in FIGS. 1 and 2).

In FIG. 3, reference numeral 15 denotes an operation panel used to display, for example, the operation time of each pump 6, 11 and the flow rate of fuel oil, and to input necessary conditions such as the amount of fuel consumption and the amount of return. , 16 is a timer.
The timer 16 measures, for example, the time required for the liquid level detection to be performed by the level sensor 9 from the time when the transfer pump 6 starts operating. Therefore, when the operation time until liquid level detection by the level sensor 9 becomes longer than necessary while the transfer pump 6 is operating, it can be determined that the viscosity is high and the flow resistance is large. In other words, when the operation time of the transfer pump 6 becomes longer than necessary, it can be determined that the viscosity of the fuel oil flowing through the transfer pump 6 is high and the flow resistance is large. The transfer pump 6 may have its own timer for measuring the operating time. In this case, it can be determined that the viscosity of the fuel oil is high and the flow resistance is high when the transfer pump 6 is operated for the operation time preset in its own timer.
The transfer pump 6 is forcibly stopped when the preset operation time is exceeded, and is prepared for the heating operation mode described later.

Further, as a monitoring target item used under a predetermined condition for determining that the viscosity of the fuel oil is a viscosity that increases the flow resistance, a driving current value of a motor used as a driving source of the transfer pump 6 can be targeted.
The driving current value is determined in order to obtain the number of revolutions and torque of the motor set in advance. However, when the number of revolutions and torque change, the value changes so as to return to the original state. When the torque decreases, the drive current value increases. Therefore, it is possible to judge that the viscosity of the fuel oil has risen by monitoring the case where the drive current value has risen, and the operation mode can be switched.

In the normal operation mode selected by the control unit 20, the fuel oil is circulated while being kept warm when the viscosity of the fuel oil does not increase the flow resistance. According to this operation mode, a state in which the temperature of the fuel oil stored in the fuel oil storage tank 2 is suppressed from being lowered and the viscosity is prevented from being increased is maintained.
In the normal operation mode, the control unit 20 controls the temperature and pressure of the fuel oil introduced to the transfer pump 6 and the operation time of the transfer pump 6, and further, the drive applied to the motor that is the drive source of the transfer pump 6. Monitor changes in current value.
These monitored items are used, for example, as predetermined conditions for determining that the viscosity of the fuel oil has changed, particularly when the viscosity has increased, when the following four types of cases occur.
(1) When the viscosity of the fuel oil has risen and reaches a temperature below the flow resistance increase.
(2) When the pressure change on the fuel oil introduction side of the transfer pump 6 is in the state of vacuum generation tendency occurrence.
(3) When the operation time of the transfer pump 6 until the level sensor 9 operates is extended.
(4) When the drive current value to the drive source of the transfer pump 6 is rising.
The normal operation mode is executed when the viscosity increase of the fuel oil does not occur because the predetermined conditions are not satisfied.
In the normal operation mode, a cycle for suctioning the fuel oil from the fuel oil storage tank 2 to the fuel oil clear tank 3 and a part of the fuel oil in the fuel oil clear tank 3 and / or the fuel oil service tank 4 The cycle of flowing downward is alternately repeated. However, even during the cycle, the transfer pump 6 is stopped according to the operation of the level sensor 9. The operating states of the pumps 6 and 11 at the time of the operation mode execution are displayed on the operation panel 15.

  When the monitoring of the monitoring target item is continued and the normal operation mode is executed, if any one or more of the predetermined conditions led by the monitoring target item match, the normal operation mode is started. It is switched to the heating operation mode.

  In the heating operation mode, the transfer pump 6 is forcibly stopped, and the downflow pump 11 is operated to flow the heated fuel oil to the fuel oil storage tank 2. At this time, the heated fuel oil flows toward the fuel oil storage tank 2 while being mixed with the fuel oil held on the fuel oil suction side of the transfer pump 6. For example, when the fuel oil flows back to the filter (a member indicated by symbol FT in FIG. 2), the fuel oil exerts a function of removing the clogging of the filter.

In the control unit 20, among the items to be monitored, the temperature and pressure can be directly monitored by sensors, but the operation time of the transfer pump 6 until the liquid level is detected using the level sensor 9 is the state shown in FIG. It is determined whether to execute the heating operation mode based on.
In FIG. 4, the vertical axis indicates the amount of fuel oil (the amount at which the level sensor 9 operates), and the horizontal axis indicates time.
In the drawing, as the viscosity of the fuel oil increases, the time until the level sensor 9 operates when the transfer pump 6 has a constant output becomes longer.
Accordingly, when the fuel oil having a low viscosity is introduced into the fuel oil clear tank 3 and the level sensor 9 operates (time indicated by symbol T in FIG. 4), the time is longer than that time. It can be determined that the viscosity of the fuel oil is high (the time shown by the symbol T1 in FIG. 4). When the transfer pump 6 itself is equipped with a timer, the viscosity of the fuel oil is judged to be high when the actual operation time is extended by comparing the timer setting time with the actual operation time. be able to.

  When the heating operation mode is selected when all or part or more of the predetermined conditions derived from the monitored item match, the heated fuel oil is sent to the fuel oil storage tank 2. Thus, not only the fuel oil in the fuel oil storage tank 2 is directly mixed, but also the fuel oil retained on the suction side of the transfer pump 6 can be mixed to raise the temperature of the fuel oil. As a result, since the fuel oil is heated in the oil passage immediately before the fuel oil is sucked into the transfer pump 6, the viscosity decrease of the fuel oil flowing into the transfer pump 6 can be secured.

  If the temperature, pressure, operating time of the transfer pump and the change in the drive current value of the transfer pump motor reach the condition where the increase in viscosity has been eliminated and the condition does not match the predetermined condition Return to the operation mode.

The fuel oil transfer device 1 used in the above heating method is characterized in that transfer can be performed while suppressing increase in viscosity of the fuel oil and increase in flow resistance at the time of transfer of fuel oil from a plurality of tanks.
Hereinafter, the configuration for obtaining this feature will be described.

FIG. 5 is a diagram in which a part of the configuration is added to the on-off valve used to set the transfer path of the fuel oil for the configuration shown in FIG.
The difference between the configuration shown in FIG. 5 and the configuration shown in FIG. 1 is as follows.
That is, the fuel oil is transferred as a relationship in which the transfer source fuel oil storage tank 2A corresponding to one fuel oil storage tank directly communicates with the transfer destination fuel oil storage tank 2B. . Specifically, in addition to using the suction pipe 10 communicated from the fuel oil clear tank 3 shown in FIG. 1 to the fuel oil suction side of the transfer pump 6 as the first auxiliary inflow pipe, a branch is made at a part of the suction pipe 10 The second auxiliary inflow pipe 100 is used.

  The first auxiliary inflow pipe 10 constitutes a path for mixing the heated fuel oil discharged from the fuel oil clear tank 3 to the fuel oil suction side of the transfer pump 6, but is continuous with the second auxiliary inflow pipe described later It communicates with the bypass fuel oil passage 101. The first auxiliary inflow pipe 10 transfers the heated fuel oil of the fuel oil clear tank 3 toward the transfer destination fuel oil storage tank 2B in order to heat the fuel oil in the transfer destination fuel oil storage tank 2B. Is a possible route.

The second auxiliary inflow pipe 100 is in communication between the fuel oil discharge side of the transfer pump 6 and the first auxiliary inflow pipe 10, and is branched from the first auxiliary inflow pipe 10 to be the fuel oil storage tank 2B of the transfer destination. A bypass fuel oil passage 101 connected to the fuel oil introduction side of the above is provided. The second auxiliary inflow pipe 100 is used as a flow path for transferring the fuel oil discharged from the transfer pump 6 toward the bypass fuel oil path 101.
The bypass fuel oil passage 101 is an oil passage for the fuel oil flowing through the second auxiliary inflow pipe 100 to be transferred toward the transfer destination fuel oil storage tank 2B. Therefore, the second auxiliary inflow pipe 100 and the bypass fuel oil passage 101 directly feed the fuel oil pumped up by the transfer pump 6 from the fuel oil storage tank 2A of the transfer source to the fuel oil introduction side of the fuel oil storage tank 2B of the transfer destination. It is used when mixing it with
The first auxiliary inflow pipe 10 is provided with a first flow down pump 11 that substitutes the flow down pump 11, and the second auxiliary inflow pipe 100 is provided with a second flow down pump 110 in a bypass fuel oil passage 101 communicating therewith. It is done.
In the bypass fuel oil passage 101 communicating with the first auxiliary inflow pipe 10 and the second auxiliary inflow pipe 100, heaters 111 and 111H capable of heating the fuel oil on the fuel oil discharge side of the first and second downflow pumps 11 and 110 Is provided.

In the transfer pipe 5, the suction pipe 10 used as the first auxiliary inflow pipe, the second auxiliary inflow pipe 100 and the bypass fuel oil path 101, on-off valves V1 to V8 for setting the transfer path of the fuel oil are arranged There is.
The open / close states of these on-off valves V1 to V8 are controlled by the control unit 20 used for controlling the drive of the transfer pump 6 and the drive motors M1, M2 and M3 of the first and second down flow pumps 11 and 110.

The control unit 20 sets a transfer path of the fuel oil when transferring the fuel oil of the fuel oil storage tank 2A in use to the fuel oil storage tank 2B as another new transfer destination. The transfer in this case is when the remaining amount of the fuel oil storage tank 2A in use becomes low, or when the fuel oil storage tank 2A in use becomes unforeseen and the transfer becomes necessary. It is executed as a target.
The control unit 20 transfers the fuel oil to the transfer destination fuel oil storage tank 2B according to the remaining amount of fuel detected by the remaining amount sensor LG1 of the fuel oil storage tank 2A that is in use at the current stage and corresponds to the transfer source. Perform the transfer process. In the case where fuel oil is to be transferred due to an unexpected situation or the like, when the command is issued from the operation panel 15 side, the transfer operation is executed in the same manner as in the case of execution according to the remaining amount.

The transfer state of the fuel oil at the time of transfer is shown in FIG.
When the fuel oil is transferred, the temperature of the fuel oil reaching the fuel oil storage tank 2B of the transfer destination is eliminated as shown in FIG. The fuel oil is transferred to the fuel oil introduction side of the transfer destination fuel oil storage tank 2B. Such a fuel oil transfer path can be used as a preheating oil path for the fuel oil to the transfer destination fuel oil storage tank 2B. As a result, it is possible to suppress the increase in viscosity of the fuel oil transferred to the transfer destination fuel oil storage tank 2B, and to obtain a state in which the transfer resistance is reduced. Therefore, this process is used as a preparation for smooth transfer of fuel oil prior to transfer.
When transferring the heated fuel oil from the fuel oil clear tank 3 to the transfer destination fuel oil storage tank 2B, the control unit 20 opens the on-off valve V7 to set the transfer path. The on-off valve 12 provided in the fuel oil clear tank 3 is similarly opened to transfer the fuel oil.

Then, when the temperature of the fuel oil in the transfer destination fuel oil storage tank 2B reaches the temperature at which the viscosity increase is not caused by preheating or the viscosity increase, the transfer source fuel oil storage tank 2B from the transfer source fuel oil storage tank 2A Fuel oil is transported towards the
The transfer path shown in FIG. 6B is used to transfer the fuel oil. That is, the second auxiliary inflow pipe 100 and the bypass fuel oil passage 101 are used so that the fuel oil can be transferred from the transfer source fuel oil storage tank 2A to the transfer destination fuel oil storage tank 2B.
The heater 111H provided in the bypass fuel oil passage 101 is subjected to heating control in order to prevent the temperature of the fuel oil flowing therethrough from becoming a temperature causing an increase in viscosity. Therefore, it is possible to prevent the fuel oil flowing through the bypass fuel oil passage 101 from becoming a temperature that causes the viscosity increase due to the heat radiation and the influence of the ambient temperature, so that the fuel oil can be transported without increasing the transport resistance. .

In the present embodiment, by using the configuration in which the first auxiliary inflow pipe 10 is in communication with the second auxiliary inflow pipe 100, as shown by the thin arrow in FIG. A portion of the flowing fuel oil can be diverted to the first auxiliary inlet pipe 10.
The amount of fuel oil flowing through the first auxiliary inflow pipe 10 is smaller than the amount of fuel oil flowing toward the bypass fuel oil passage 101 with respect to the total amount of fuel oil transferred by the transfer pump 6, for example, an amount of about 30% It is. Therefore, 70% of the fuel oil from the transfer source fuel oil storage tank 2A is transferred to the transfer destination fuel oil storage tank 2B, and a 30% amount less than this amount is transferred to the transfer oil of the transfer pump 6 It is transported to the (introduction) side. As a result, the temperature drop that causes the viscosity increase of the fuel oil introduced into the transfer pump 6 is corrected, and the load increase of the transfer pump 6 is suppressed. The heater 111 provided in the first auxiliary inflow pipe 10, like the heater 111H provided in the bypass fuel oil passage 101, is for preventing the temperature of the flowing fuel oil from becoming a temperature causing viscosity increase. Heating control is performed.

The control unit 20 opens the on-off valves V1, V3, V8, V7, and V6, V5 along the flow of the fuel oil in order to set the transfer path shown in FIG. 6B.
Among the on-off valves, the on-off valves V5 and V6 provided in the first auxiliary inflow pipe 10 are different from the on-off valves V7 and V8 provided in the second auxiliary inflow pipe 100 and the bypass fuel oil passage 101. The amount of opening is reduced and the oil passage can be throttled. In particular, by setting the opening amount of the on-off valve V7 smaller than the full opening of the on-off valve V8, the bypass fuel oil passage 101 is narrowed more than the second auxiliary inflow pipe 100. Therefore, fuel oil toward the first auxiliary inflow pipe 100 Can be transported. It is desirable that the opening amount of the on-off valve V7 be set to an amount by which the amount of fuel oil in the first auxiliary inflow pipe 100 described above can be obtained.
When the control unit 20 diverts a part of the fuel oil flowing through the second auxiliary inflow pipe 100 to the first auxiliary inflow pipe 10, conditions different from the above-described heating operation mode are used. That is, although the heating operation mode is performed on the assumption that the transfer pump 6 is forcibly stopped, the state shown in FIG. 6B assumes that the transfer pump 6 is continued to operate. There is. Therefore, it is important that the temperature of the fuel oil on the fuel oil suction (introduction) side of the transfer pump 6 be maintained at a temperature that does not cause an increase in viscosity. Therefore, in the present embodiment, the mixing ratio of the fuel oil to the fuel oil suction (introduction) side of the transfer pump 6 is adjusted to prevent the temperature drop of the fuel oil.

According to the fuel oil transfer system according to the above embodiment, the temperature of the fuel oil introduced into the transfer pump 6 and the temperature of the fuel oil transferred to the fuel oil storage tank of the transfer destination are maintained at a temperature where viscosity increase does not occur. can do.
In particular, the transfer of the fuel oil from the transfer source to the transfer destination fuel oil storage tank can be performed by connecting the fuel oil storage tanks with each other. Thus, unlike the case of supplying from the fuel oil clear tank 3 to the transfer destination fuel oil storage tank 2B, the reduction of the fuel oil in the fuel oil clear tank 3 can be suppressed. Moreover, since the preheated fuel oil or the heated fuel oil can be mixed with the transfer path between the communicating tanks to prevent the temperature drop of the fuel oil, the fuel oil can be transferred smoothly while preventing the viscosity increase. is there.

According to the present invention, since the fuel oil in the fuel oil storage tank can be transferred to a new fuel oil storage tank, it is possible to use the fuel oil in the fuel oil storage tank, which has been reduced, without leaving it. . As a result, there is a high possibility that fuel consumption can be eliminated.
In particular, since the transferred fuel is transferred by communication between the tanks, the amount of fuel oil to be discharged from the fuel oil clear tank can be suppressed, and further, the temperature drop of the transferred fuel oil can be suppressed and transferred. High availability at points.

1 Fuel oil transfer device used for fuel oil transfer system 2 Fuel oil storage tank 2A Fuel oil storage tank of transfer source 2B Fuel oil storage tank of transfer destination 3 Fuel oil clear tank 5 Transfer pipe 6 Transfer pump 7 Temperature sensor 8 Pressure sensor DESCRIPTION OF SYMBOLS 10 Suction pipe used for the 1st auxiliary inflow pipe 11 Flow down pump equivalent to 1st flow down pump 20 Control part 100 2nd auxiliary inflow pipe 101 bypass fuel oil passage 110 2nd flow down pump 111, 111H Heater LG1, LG2 Remaining amount sensor V1 to V8 on-off valve

Claims (3)

The fuel oil transferred by the transfer pump from one of the plurality of fuel oil storage tanks is heated by the fuel oil recovery tank, and the heated fuel oil is returned to the fuel oil storage tank by the downflow pump to store the fuel oil. In a fuel oil transfer system capable of partially increasing the temperature of fuel oil in the fuel oil storage tank by mixing it with fuel oil in a tank.
When the one fuel oil storage tank is a transfer source and the other is a transfer destination fuel oil storage tank, the transfer from the fuel oil clear tank to the transfer destination fuel oil storage tank or from the fuel oil clear tank A first auxiliary inlet pipe capable of transferring fuel oil to the fuel oil suction side of the pump;
A second auxiliary inflow pipe communicating between the fuel oil discharge side of the transfer pump and the first auxiliary inflow pipe, and a branch of the first auxiliary inflow pipe transfer the fuel oil to the fuel oil storage tank of the transfer destination Equipped with a possible bypass fuel oil passage,
The heated fuel oil of the fuel oil clear tank is mixed with the fuel oil of the transfer destination fuel oil storage tank using the first auxiliary inflow pipe when preheating the fuel oil of the transfer destination fuel oil storage tank And a transfer path for introducing the fuel oil of the fuel oil storage tank of the transfer source into the fuel oil storage tank of the transfer destination using the second auxiliary inflow pipe and the bypass fuel oil path can be selected. And returning part of the fuel oil of the transfer source to the fuel oil introduction side of the transfer pump using the first auxiliary inflow pipe when transferring the fuel oil to the fuel oil storage tank to the transfer destination Fuel oil transfer system characterized by In the fuel oil transfer system according to claim 1,
A first flow down pump is provided in the first auxiliary inflow pipe, a second flow down pump is provided in the second auxiliary in flow pipe, and a heater is provided on the fuel oil discharge side of the first and second flow down pumps, respectively. A fuel oil transfer system characterized in that In the fuel oil transfer system according to claim 1 or 2,
When the fuel oil is transferred from the transfer source fuel oil storage tank to the transfer destination fuel oil transfer tank, the amount of fuel oil flowing through the second auxiliary inflow pipe and the bypass fuel oil passage is increased to the first auxiliary inflow pipe A fuel oil transfer system characterized in that the amount of fuel oil flowing can be set small.

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