TWI673431B - Fuel oil transfer device - Google Patents

Abstract

[Problem] To provide a fuel oil transfer device having a configuration capable of reducing the flow resistance of the fuel oil that is sucked in and transferred from a fuel oil storage tank. [Technical Content] It is provided with a transfer pipe (5) provided at a pipe end portion (5A) of a bell mouth (5A1) having an opening toward the bottom of a fuel oil storage tank (2A), and a fuel oil separation tank ( 3) A part of the heated fuel oil is used in the heating section for heating the fuel oil flowing in the transfer pipe (5), and the heating section is used to insert the fuel oil storage tank barrel (2A) in the transfer pipe (5) The branch pipe which merges with the pipe end part (5A) of the transfer pipe (5) near the position inside).

Description

Fuel oil transfer device

[0001] The present invention relates to a fuel oil transfer device. More specifically, the present invention relates to a structure for supplying and discharging a fuel oil.

[0002] When fuel oil used in boilers of ships and generators is stored in a fuel oil storage tank, the fuel oil is sucked into a transfer pipe by a member having a funnel-shaped bell mouth having an opening in the fuel oil. The bell mouth is a member that is easy to intensify the fuel oil with a wide opening facing downward (for example, Patent Document 1).专利 Patent Document 1 discloses a configuration in which a plurality of sheet portions extending in a horizontal direction are provided around a bell mouth to suppress eddy currents generated during inhalation. [0003] On the other hand, one of the fuel oils is known as a low-cost C heavy oil. C heavy oil is easy to change its viscosity by the influence of temperature. In particular, when the temperature is lowered, the viscosity becomes higher, and the flow resistance when suctioned and transferred is increased. Therefore, even if the eddy current can be suppressed, a decrease in flow resistance cannot be expected. [Knowledge Technical Literature] [Patent Literature] [0004] [Patent Literature 1] Japanese Patent Laid-Open No. 2013-141865

[Problems to be Solved by the Present Invention] [0005] An object of the present invention is to provide a fuel oil transfer device having a structure capable of reducing a flow resistance of a fuel oil sucked in and transferred from a fuel oil storage tank. [Means to Solve the Problem] [0006] In order to solve the problem, the present invention is a fuel oil transfer device, which transfers fuel oil from at least one fuel oil storage tank to a fuel oil separation tank by a transfer pump. After being heated, the heated fuel oil is returned to one or other of the fuel oil storage tank barrels by flowing down the pump. The fuel oil storage tank barrels can be mixed in the fuel oil storage tank barrels by mixing with the fuel oil in the fuel oil storage tank barrels. The temperature of the fuel oil is partially increased, and includes a transfer pipe provided with a bell mouth at an end of the pipe toward the bottom of the fuel oil storage tank, and fuel oil heated from the fuel oil separation tank. A part of the heating part is used in a heating part for heating the fuel oil flowing in the transfer pipe, and the heating part is used to merge with the pipe part of the transfer pipe near a position where the transfer pipe is inserted into the inside of the fuel oil storage tank barrel. Branches. [Effect of the Invention] [0007] According to the present invention, the fuel oil from the fuel oil separation tank is heated near the bell mouth of the transfer pipe inserted in the fuel oil storage tank, and the fuel oil is heated from the fuel oil. The flow resistance of the fuel oil when the storage tank barrel is sucked in can be reduced.

[0009] Hereinafter, embodiments for carrying out the present invention will be described. Fig. 1 is a diagram showing the principle configuration of a fuel oil transfer device 1 according to an embodiment for carrying out the present invention. The principle structure described below is a structure in which a part of the fuel oil stored in the fuel oil storage tank can be heated by the heated fuel oil to reduce the viscosity. (2) The fuel oil transfer device 1 includes a fuel oil separation tank 3 and a fuel oil common tank 4 that communicate with a plurality of fuel oil storage tanks 2 including a pair. The fuel oil separation 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. by a heater (not shown). [0010] The fuel oil storage tank bucket 2 and the fuel oil separation tank bucket 3 are communicated via a transfer pipe 5. In the middle, a transfer pump 6, a temperature sensor 7, and a pressure sensor 8 are arranged. The radon temperature sensor 7 measures, for example, the temperature on the fuel fill port side, that is, the suction side of the transfer pump 6. The pressure sensor 8 is provided to monitor the pressure change of the fuel oil sucked into the transfer pump 6. The pressure change is used to determine a change in flow resistance corresponding to a change in the viscosity 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 become vacuum. Therefore, if a pressure change in the vacuum tendency is detected, heating for reducing the viscosity of the fuel oil becomes necessary.燃料 The fuel oil separation tank barrel 3 is provided with a liquid level sensor 9 for detecting the liquid level of the fuel oil sucked by the transfer pump 6. The liquid level sensor 9 is a sensor capable of detecting a liquid level when a predetermined amount of fuel oil is introduced into the fuel oil separation tank 3. The liquid level sensor 9 is used to stop the driving of the transfer pump 6 when a predetermined amount of fuel oil is introduced into the fuel oil separation tank 3. The thallium sensor is not limited to the above-mentioned position, and is also provided inside the fuel oil storage tank barrel 2 (refer to FIG. 5). The sensors LG1 and LG2 are residual sensors that detect the remaining amount of fuel in the barrel of the fuel oil storage tank based on the liquid level or pressure. [0011] The common fuel tank 4 is a fuel tank that is used to supply fuel oil to the internal combustion engine to temporarily store the fuel oil after being heated and purify it. The fuel oil storage tank bucket 2 and the fuel oil common tank bucket 4 are communicated through a suction pipe 10, and a flow-down pump 11 is arranged in the middle. A part of the fuel oil stored in the fuel oil common tank 4 is caused to flow down the fuel oil storage tank 2 by the down pump 11 to raise the temperature of the fuel oil in the fuel oil storage tank 2. The reason for the name of the down-flow pump 11 in this case is the premise of a configuration in which the fuel oil common tank 4 is disposed at a higher position than the fuel oil storage tank 2. That is, it is because the fuel oil is spouted from the fuel tank 4 which is a higher level to the fuel tank 2 which is lower than the lower level, and appears to flow down. [0012] In the configuration shown in FIG. 1, a configuration is adopted in which the fuel oil separation tank 3 and the fuel oil common tank 4 communicate with the suction pipe 10, respectively. Therefore, the fuel oil in each of the tanks 3 and 4 can be set so that the flow path of the heated fuel oil from the tanks 3 and 4 or any of the tanks to the fuel oil storage tank 2 can be set. The outlet flow path is provided with a valve 12. [0013] The above fuel oil transfer device 1 heats the fuel oil sucked from the fuel oil storage tank bucket 2 toward the fuel oil separation tank bucket 3 by the transfer pump 6, and the heated fuel oil is purified and purified. The fuel oil is usually introduced into the tank 4 and the stored fuel oil is supplied to the internal combustion engine or the like. A part of the fuel oil temporarily stored in the fuel oil separation tank 3 and the fuel oil common tank 4 is returned to the fuel oil storage tank 2 by flowing down the 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. [0014] In this embodiment, the operating time of the pumps with each other, for example, the transfer pump 6 is approximately 15 minutes and the down-flow pump 11 is approximately 45 minutes are selectively operated alternately. Among these times, the operating time of the transfer pump 6 is, for example, the time until the liquid level of the fuel oil can be detected by the liquid level sensor 9 in the fuel oil separation tank 3 described above. . That is, the number of rotations of the transfer pump 6 can be determined as fuel if the liquid level of the fuel oil is detected by the liquid level sensor 9 during the operating time when the fuel oil flows according to a rated flow rate such as a drive current. The viscosity of the fuel oil does not occur due to the resistance to the flow of the oil. When the operating time is exceeded, it can be determined that the viscosity of the fuel oil is high and the fluidity is poor. In addition, the liquid level sensor 9 detects that the fuel oil introduced into the fuel oil separation tank 3 reaches a predetermined amount, and stops the operation of the transfer pump 6 to prevent the fuel oil from overflowing. In addition, when no fuel oil is consumed during parking, the operating time of the transfer pump 6 is shortened, and the time until the liquid level sensor 9 operates is, for example, about 6 minutes. [0015] The path for drawing fuel oil from the fuel oil storage tank barrel 2 toward the fuel oil separation tank barrel 3 using the transfer pump 6 is shown by symbols F1 to F5 in FIG. 1. The flow path of the fuel oil from the fuel oil tank 4 to the fuel oil storage tank 2 using the down pump 11 is shown by arrows F10 to F13 in FIG. 2. (2) The fuel oil transfer device 1 using such a configuration has been disclosed in the previous application of the present applicant, which is Japanese Patent Application Laid-Open No. 2012-17123. [0016] The fuel oil transfer device 1 having the above configuration is a heating method that uses an increase in the flow resistance of the fuel oil to suppress the increase. In this case, heating means that the temperature of the unheated fuel oil is increased by mixing the heated fuel oil with the unheated fuel oil. Hereinafter, a heating method using the fuel oil transfer device 1 will be described. [0017] The fuel oil transfer device 1 can be selected from a normal operation mode to be executed when the viscosity of the fuel oil is low and the flow resistance is small, and a heating operation to be executed when the viscosity is high and the flow resistance is increased. Any of the patterns. The normal operation mode is a mode in which the transfer pump 6 and the down-flow pump 11 for supplying fuel oil into the fuel oil storage tank 2 are operated alternately in response to the operating state of the liquid level sensor 9 to circulate the fuel oil. In the heating operation mode, in addition to forcibly stopping the transfer pump 6, the fuel oil intercepted on the suction side of the transfer pump 6 is heated, and the fuel oil is also stored by the fuel oil returned to the fuel oil storage tank 2. Heating mode of the fuel oil in the tank 2. The heating operation mode is preferably performed until the viscosity of the fuel oil intercepted on the side of the transfer pump 6 reaches a value that does not increase the flow resistance.的 For the conditions used to execute the heating operation mode, the following example parameters can be used as data. That is, the parameters are at least the temperature and pressure of the fuel oil sucked toward the transfer pump 6 and the operating time of the transfer pump 6. Regarding the operation time of the transfer pump 6, as described above, reference is made to the operation time until the liquid level sensor 9 operates, and the timing time of the timer provided in the transfer pump 6 itself. If all or any of these parameters are in accordance with the predetermined conditions necessary for heating, the heating operation mode is executed. [0018] Hereinafter, the configuration and function for implementing this operation mode will be described using FIG. 3. (2) The transfer pump 6 and the down-flow pump 11 are controlled in the operating state by the control unit 20 shown in FIG. 3. [0019] The control unit 20 connects the temperature sensor 7, the pressure sensor 8, and the liquid level sensor 9 provided on the transfer pipe 5 to the input side. The drive unit of the transfer pump 6 and the drive unit of the down pump 11 are connected to the output side of the control unit 20, respectively. The transfer pump 6 and the down-flow pump 11 both use a type in which the flow rate and the flow rate can be controlled by rotating the motor (the components shown by the symbols M1 and M2 in Figs. 1 and 2). [0020] In FIG. 3, reference numeral 15 is an operation panel used for displaying, for example, the operating time of each of the pumps 6, 11 and the flow rate of the fuel oil, etc., and inputting necessary conditions for further returning the fuel consumption amount and the like. The symbol 16 is a timer. The timer 16 measures, for example, the time required from the point when the operation of the transfer pump 6 is started to the time when the liquid level is detected by the liquid level sensor 9. Therefore, when the transfer pump 6 is running, the operating time until the liquid level detection by the liquid level sensor 9 is detected is too long, it can be judged that the viscosity is high and the flow resistance is large. In other words, when the operation time of the transfer pump 6 is excessively long, the viscosity of the fuel oil flowing in the transfer pump 6 is high, and it can be determined that the flow resistance is large. The transfer pump 6 may have its own timing for measuring the operation time. In this case, when the transfer pump 6 is operated for more than the operation time set in advance of its own timer, it can be determined that the fuel oil has a high viscosity and a high flow resistance. The transfer pump 6 is provided with a heating operation mode described later that is forcibly stopped when the preset operation time is exceeded. [0021] In addition, the monitoring target item used to determine the viscosity of the fuel oil is a predetermined condition for increasing the viscosity of the flow resistance, and the drive current value of the motor used for the drive source of the transfer pump 6 may be targeted. Although the drive current value is determined in order to obtain the preset number of rotations and torque of the motor, when the number of rotations and torque changes, the original state is changed, especially when the number of rotations and torque decreases. The drive current value increases. Here, the increase in the viscosity of the fuel oil can be determined by monitoring the increase in the driving current value, and the operation mode can be switched. [0022] The normal operation mode selected by the control unit 20 circulates the fuel oil while maintaining the viscosity of the fuel oil without increasing the value of 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 decreasing and the viscosity is prevented from being increased is maintained. The control unit 20 in the normal operation mode monitors: the temperature and pressure of the fuel oil introduced into the transfer pump 6 and the operating time of the transfer pump 6 are further added to the drive source of the transfer pump 6, that is, the drive current value of the motor Variety. These monitoring items are used as a predetermined condition for determining the viscosity change of the fuel oil, especially the viscosity increase, when the following four types of cases occur. (1) The case where the viscosity of the fuel oil increases and reaches a temperature below the temperature at which the flow resistance increases. (2) The pressure change on the fuel oil introduction side of the transfer pump 6 may be a state in which a tendency to vacuum occurs. (3) The operation time of the transfer pump 6 until the liquid level sensor 9 is operated is increased. (4) In the case where the drive current value of the drive source of the transfer pump 6 is increased.通常 If these conditions are not met and the increase in the viscosity of the fuel oil does not occur, the normal operation mode is implemented. During the execution of the normal operation mode, the cycle of sucking fuel oil from the fuel oil storage tank 2 to the fuel oil separation tank 3 and the fuel oil separation tank 3 and a part of the fuel oil common tank 4 are alternately repeated. Circulation of the fuel oil flowing down towards the fuel oil storage tank barrel 2. However, even in the middle of the cycle, the transfer pump 6 may be stopped in response to the operation of the liquid level sensor 9. The operation states of the pumps 6 and 11 when this operation mode is executed are displayed on the operation panel 15. [0023] When the monitoring of the monitoring target item is continued, and when the normal operation mode is performed, when all or any of the predetermined conditions of the monitoring target item match, the normal operation mode is switched to the heating operation mode. . [0024] In the heating operation mode, the transfer pump 6 is forcibly stopped, and the down-flow pump 11 is operated to cause the heated fuel oil to flow toward 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 intercepted on the fuel oil suction side of the transfer pump 6. The fuel oil is, for example, a filter (a member shown by the symbol FT in FIG. 2) flows countercurrently and functions to resolve the filter clogging. [0025] In the control unit 20, although the temperature and pressure in the monitoring target items can be directly monitored by a sensor, the operation of the transfer pump 6 until the liquid level is detected using the liquid level sensor 9 is related. The time is based on the state shown in Fig. 4 to determine whether or not to execute the heating operation mode.第 In Fig. 4, the vertical axis indicates the amount of fuel oil (the amount of operation of the liquid level sensor 9), and the horizontal axis indicates the time. In the same figure, as the viscosity of the fuel oil becomes higher, the time required for the liquid level sensor 9 to operate becomes longer when the transfer pump 6 has a constant output. Therefore, based on the time (the time shown by the symbol T in FIG. 4) until the fuel oil having a relatively low viscosity is introduced into the fuel oil separation tank 3 and the liquid level sensor 9 is actuated, the time is longer than this time. When it grows up (the time shown by the symbol T1 in FIG. 4), it can be determined that the viscosity of the fuel oil is high. In addition, in the case where the transfer pump 6 itself is provided with a timer, it can be determined that the viscosity of the fuel oil is high when the set time of the timer is compared with the actual operation time, and the actual operation time is increased. [0026] When all, a part, or a plurality of predetermined conditions of the monitoring target items are consistent, if the heating operation mode is selected, the heated fuel oil is sent toward the fuel oil storage tank 2. Accordingly, not only the fuel oil is directly mixed with the fuel oil in the fuel oil storage tank 2, but also the fuel oil intercepted on the suction side of the transfer pump 6 is also mixed, and the temperature of the fuel oil can be increased. 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, it is possible to ensure that the viscosity of the fuel oil flowing into the transfer pump 6 decreases. [0027] The monitoring target items, that is, the temperature, pressure, and operating time of the transfer pump, are further changed when the drive current value of the transfer pump motor reaches a condition for dissolving the viscosity rise, and when the conditions do not agree with the predetermined conditions, it returns to normal. Operation mode. [0028] Next, a modification of the above embodiment will be described. FIG. 5 is a view in which a part of the configuration is added to the on-off valve used to set the fuel oil transfer path for the configuration shown in FIG. 1 as a target. The difference between the structure shown in FIG. 5 and the structure shown in FIG. 1 is as follows. That is, a point is provided in which the fuel oil is transferred from a fuel oil storage tank bucket 2A corresponding to the origin of the transfer of one fuel oil storage tank, and the fuel oil storage tank bucket 2B of the transfer destination is directly connected. . Specifically, the suction pipe 10 communicating from the fuel oil separation tank barrel 3 shown in FIG. 1 to the fuel oil suction side of the transfer pump 6 is used as a first auxiliary inflow pipe and a part of the suction pipe 10 is divided. Point of the second auxiliary inflow pipe 100. In the following description, the inflow pipe 10 may be referred to as a first auxiliary inflow pipe 10. [0029] Although the first auxiliary inflow pipe 10 constitutes a path for mixing the heated fuel oil discharged from the fuel oil separation tank 3 toward the fuel oil suction side of the transfer pump 6, it is combined with a second auxiliary inflow described later The pipe is continuously connected to the fuel oil path 101. The first auxiliary inflow pipe 10 is for heating the fuel oil in the fuel oil storage tank barrel 2B of the transfer destination, and can heat the heated fuel oil in the fuel oil separation tank 3 toward the fuel oil storage tank barrel of the transfer destination. 2B transfer path. [0030] The second auxiliary inflow pipe 100 communicates between the fuel oil discharge side of the transfer pump 6 and the first auxiliary inflow pipe 10, and is further provided with fuel oil that is divergent from the first auxiliary inflow pipe 10 and from the transfer destination. The bypass fuel oil passage 101 connected to the fuel oil introduction side of the storage tank barrel 2B. 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 transferring the fuel oil flowing through the second auxiliary inflow pipe 100 toward the fuel oil storage tank barrel 2B to be transferred. Therefore, the second auxiliary inflow pipe 100 and the bypass fuel oil path 101 are the fuel oil drawn up from the fuel oil storage tank barrel 2A of the transfer origin by the transfer pump 6 directly to the fuel oil storage tank of the transfer destination. It is used when the fuel oil introduction side of the barrel 2B is mixed. The first auxiliary inflow pipe 10 is provided with a first down pump 11 which replaces the down pump 11, and the second auxiliary inflow pipe 100 is provided with a bypass fuel oil path 101 and a second down pump 110 which communicate with the first down pump 110. In the bypass fuel oil passage 101 communicating with the first auxiliary inflow pipe 10 and the second auxiliary inflow pipe 100, a heater capable of heating the fuel oil is provided on the fuel oil discharge side of the first and second down pumps 11, 110. 111, 111H. [0031] In the suction pipe 10 used as the transfer pipe 5, the first auxiliary inflow pipe, the second auxiliary inflow pipe 100, and the bypass fuel oil passage 101, on-off valves V1 to V8 for setting a fuel oil transfer path are arranged. . The on-off valves V1 to V8 are controlled to be opened and closed by a control unit 20 used for driving control of the drive motors M1, M2, and M3 of the transfer pump 6 and the first and second down pumps 11 and 110. [0032] The control unit 20 sets the fuel oil transfer path when the fuel oil in the used fuel oil storage tank bucket 2A is switched to another fuel oil storage tank bucket 2B that is a new transfer destination. The replacement in this case is a case where the remaining amount of the fuel oil storage tank bucket 2A in use is small, or a situation where an unexpected situation occurs during the use of the fuel oil storage tank bucket 2A and the necessary replacement is required. Subject is implemented. The control unit 20 responds to the fuel remaining amount detected by the remaining amount sensor LG1 of the fuel oil storage tank barrel 2A which is currently in use and corresponds to the origin of the transfer. Treatment of oil storage tank barrel 2B. When the fuel oil is changed due to an unexpected situation or the like, if the command is issued from the operation panel 15 side, the changeover operation is performed in the same manner as in the case where the corresponding residual amount is executed. [0033] The transfer state of the fuel oil during the replacement is shown in FIG. 6. When the fuel oil is exchanged, in order to dissolve the temperature of the fuel oil reaching the fuel oil storage tank barrel 2B at the transfer destination, as shown in FIG. 6 (A), the fuel oil is separated from the tank barrel 3 to complete the heating. The fuel oil is transferred toward the fuel oil introduction side of the fuel oil storage tank barrel 2B of the transfer destination. This fuel oil transfer path is a preheating oil path that can be used as a fuel oil storage tank barrel 2B for transferring fuel oil to a transfer destination. As a result, it is possible to obtain a state in which the viscosity of the fuel oil transferred to the fuel oil storage tank 2B to be transferred is reduced, and the flow resistance is suppressed. Therefore, this process is used as preparation for smooth transfer of fuel oil before transfer. When the heated fuel oil is transferred from the fuel oil separation 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. Similarly, the on-off valve 12 provided in the fuel oil separation tank barrel 3 is opened to transfer fuel oil. [0034] Next, when the temperature of the fuel oil in the fuel oil storage tank barrel 2B of the transfer destination is preheated or has reached a temperature that does not cause viscosity to rise, the fuel oil storage tank barrel 2A from the place of origin is transferred. The fuel oil storage tank 2B toward the transfer destination causes the fuel oil to be transferred. For the transfer of fuel oil, use the transfer path shown in Figure 6 (B). That is, the second auxiliary inflow pipe 100 and the bypass fuel oil path 101 are used so that the fuel oil can be transferred from the fuel oil storage tank bucket 2A of the transfer origin to the fuel oil storage tank bucket 2B of the transfer destination. The heater 111H provided in the bypass fuel oil path 101 is heated and controlled in order to prevent the temperature of the fuel oil flowing therefrom from increasing to a viscosity-causing temperature. Therefore, it is possible to prevent the temperature of the fuel oil from increasing due to the heat of the fuel oil flowing through the detoured fuel oil passage 101 and the surrounding temperature, and thus it is possible to transfer the fuel oil without increasing its flow resistance. [0035] In this embodiment, by using a configuration in which the first auxiliary inflow pipe 10 and the second auxiliary inflow pipe 100 communicate with each other, as shown by a thin line arrow in FIG. A part of the fuel oil in the path 101 is branched toward the first auxiliary inflow pipe 10. The amount of the fuel oil flowing through the first auxiliary inflow pipe 10 is smaller than the amount of the fuel oil flowing toward the bypass fuel oil path 101 with respect to the entire amount of the fuel oil transferred by the transfer pump 6, for example, an amount of about 30% . Therefore, 70% of the fuel oil from the fuel oil storage tank barrel 2A of the transfer origin is transferred toward the fuel oil storage tank barrel 2B of the transfer destination, and 30% less than this amount is directed toward the transfer pump 6 The fuel oil suction (introduction) side is transferred. As a result, the temperature drop that causes the viscosity of the fuel oil introduced into the transfer pump 6 to rise is corrected, and an increase in the load on the transfer pump 6 is suppressed. The heater 111 provided in the first auxiliary inflow pipe 10 is heated and controlled in order to prevent the temperature of the flowing fuel oil from becoming a temperature that causes the viscosity to rise, similarly to the heater 111H provided in the bypass fuel oil path 101. . [0036] The control unit 20 opens the on-off valves V1, V3, V8, V7, and V6, V5 in order to set the transfer path shown in FIG. 6 (B) along the flow of the fuel oil. Among the on-off valves, the on-off valves V5 and V6 provided in the first auxiliary inflow pipe 10 reduce the opening amount of the on-off valves V7 and V8 provided in the second auxiliary inflow pipe 100 and the bypass fuel oil path 101. Throttle the oil circuit. In particular, by reducing the opening amount of the on-off valve V7 more than the full opening of the on-off valve V8, the bypass fuel oil path 101 is more throttled than the second auxiliary inflow pipe 100, so that the fuel oil can be transferred toward the first auxiliary inflow pipe 10. . The opening amount of the on-off valve V7 is preferably set to an amount that can obtain the amount of fuel oil in the first auxiliary inflow pipe 10 described above. The knuckle control unit 20 uses a condition different from the aforementioned heating operation mode when a part of the fuel oil flowing through the second auxiliary inflow pipe 100 is branched toward the first auxiliary inflow pipe 10. That is, the heating operation mode is performed on the premise that the transfer pump 6 is forcibly stopped, but the state shown in FIG. 6 (B) is based on the premise that the operation of the transfer pump 6 is continued. Therefore, it is important that the temperature of the fuel oil on the fuel oil suction (introduction) side of the transfer pump 6 is maintained at a temperature that does not cause an increase in viscosity. Here, in this embodiment, the mixing ratio of the fuel oil toward the fuel oil suction (introduction) side of the transfer pump 6 is adjusted to prevent the temperature of the fuel oil from decreasing. [0037] As described above, the present embodiment is characterized in that the fuel oil sucked from the fuel oil storage tank toward the transfer pump 6 can be a mixture of the fuel oil after heating, which has the following features. That is, the point of the bell mouth provided at the pipe end portion of the transfer pipe 5 is close to a point where a heating portion for heating the fuel oil taken in the bell mouth is provided. The following describes the structure of this characteristic relationship. [0038] FIG. 7 is a schematic diagram for explaining the state of fuel oil flow with a fuel oil transfer device 1 including a plurality of fuel oil storage tanks as shown in FIG. 5. In the same figure (A), the oil path 10A used for returning the fuel oil heated by the fuel oil separation tank 3 toward one 2A of the fuel oil storage tank is the same as that shown in FIG. 5. The case shown is different, and it communicates with the fuel oil storage tank barrel-side pipe end portion 5A of the transfer pipe 5.如 As shown in FIG. 7 (B), the pipe end portion 5A of the transfer pipe 5 is provided with a funnel-shaped bell mouth 5A1 which opens toward the bottom in the fuel oil storage tank barrel 2A. The oil passage 10A is used as a heating portion for heating a portion of the fuel oil that has been heated from the fuel oil separation tank 3 and flowing through the pipe end portion 5A of the transfer pipe 5 to heat the fuel oil. That is, the oil passage 10A has a function of mixing the fuel oil after heating with the fuel oil flowing in the pipe end portion 5A of the transfer pipe 5. [0039] The structure in which the heated fuel oil is mixed with the pipe end portion 5A of the transfer pipe 5 has a structure shown in FIGS. 7 (B) to (E). In Figs. 7 (B) and (C), it is shown that the fuel oil storage tank barrel 2A is provided with a heating portion in an oil passage 10A formed by a branch pipe that merges with the pipe end portion 5A of the transfer pipe 5 Composition. The fuel oil attracted from the bell mouth 5A1 is mixed with the fuel oil that has been heated by being introduced from the oil passage 10A, the temperature is increased, and the viscosity is reduced (the arrows in (C) to (E) in Fig. 7 are The direction of flow of the fuel oil and the fuel oil after heating is displayed. The arrow R1 is the direction of the flow of the attracted fuel oil. The arrow R2 is the direction of the flow of the fuel oil after the heating. And the direction in which the heated fuel oil flows in a mixed manner). This configuration is a configuration in which an oil passage 10A constituting a heating section can be added to the transfer pipe 5 incorporated in the fuel oil storage tank barrel 2A as required. [0040] FIG. 7 (D) shows that the fuel oil storage tank barrel 2A is constituted by a branch pipe communicating with the vicinity of the position of the bell mouth 5A1 provided at the pipe end portion 5A of the transfer pipe 5. The structure of the oil passage 10A is provided with a heating section. The fuel oil sucked from the bell mouth 5A1 has the same configuration as shown in FIG. 7 (C), and is mixed with the fuel oil that has been heated and introduced from the oil passage 10A. In this configuration, a part of the oil passage 10A is provided in the fuel oil storage tank barrel 2A. In addition to the fuel oil attracted from the bell mouth 5A1, the fuel oil around the bell mouth 5A1 can also come from the oil passage 10A. Heat transfer composition is heated. [0041] FIG. 7 (E) shows a double tube structure of the bell mouth 5A1 of the tube end portion 5A of the transfer tube 5 inserted in the fuel oil storage tank barrel 2A and the tube surrounded by the bell mouth 5A1. A structure having a heating section. In this configuration, the fuel oil after heating flows in the outer pipe portion, and is discharged from the periphery of the bell mouth 5A1 toward the fuel oil storage tank barrel 2A and mixed with the fuel oil. Therefore, the pipe can be opened to the open end. The fuel oil around the end portion 5A is heated. The fuel oil sucked from the bell mouth 5A1 is mixed with the heated fuel oil that is discharged from the outer periphery of the bell mouth 5A1. In either configuration, the fuel oil in the fuel oil storage tank barrel 2A can be heated by the fuel oil after heating. In particular, the fuel oil transferred to the fuel oil separation tank 3 by the suction transfer pipe 5 is not limited to the object, and a part of the fuel oil stored in the fuel oil storage tank 2A may be heated. As a result, not only the fuel oil that is sucked toward the bell mouth 5A1 is attracted, but the fuel oil before being sucked can be favorably heated to suppress the viscosity increase. [0042] According to the fuel oil transfer device of the above embodiment, it is possible to prevent an increase in the flow resistance of the fuel oil introduced from the fuel oil storage tank 2A toward the transfer pump 6. In particular, in addition to reliably suppressing a decrease in viscosity due to heating of the fuel oil during the transfer, it is also possible to reliably suppress an increase in the viscosity of the fuel oil in the storage stage before being transferred. [Industrial Applicability]] [0043] In the present invention, the fuel oil transferred from the fuel oil storage tank can be heated not only during the transfer process but also at the stage before the transfer, so the movement resistance caused by the increase in viscosity The point at which the increase can be reliably suppressed is that the availability is high. In particular, it is also possible to separately add a structure for heating the fuel oil in the fuel oil storage tank after the transfer process and the stage before the transfer, and the structure can be commensurate with the cost of selecting the heating structure, and the availability is high. (2) The arrangement structure of the branch pipe that merges with the pipe end of the transfer pipe, and the double pipe structure of the transfer pipe that communicates with the bell mouth may also be selected. As a result, it is not necessary to attach a special structure such as a heater and a steam mechanism that heat the fuel oil before the bell mouth is attracted, and the usability is also high.

[0044]

1‧‧‧ fuel oil transfer device

2‧‧‧ fuel oil storage tank barrel

2A‧‧‧ barrels of fuel oil storage tanks of origin

2B‧‧‧ Fuel tanks for transfer destination

3‧‧‧ fuel oil separation tank

4‧‧‧Fuel oil tanks

5‧‧‧ transfer tube

5A‧‧‧ end of barrel side pipe of fuel oil storage tank for transfer pipe

5A1‧‧‧flare

6‧‧‧ transfer pump

7‧‧‧ temperature sensor

8‧‧‧ Pressure Sensor

10‧‧‧ Suction tube for the first auxiliary inflow tube

10A‧‧‧ Oil circuit used by heating section

11‧‧‧ equivalent to the first downflow pump

20‧‧‧Control Department

100‧‧‧ 2nd auxiliary inflow pipe

101‧‧‧ detour fuel oil road

110‧‧‧Second flow pump

111, 111H‧‧‧ heater

LG1, LG2‧‧‧Residual sensor

V1 ～ V8‧‧‧Open and close valve

[0008] [FIG. 1] A schematic diagram showing a configuration of a fuel oil transfer device according to an embodiment of the present invention and a flow of fuel oil when the fuel oil is heated. [Fig. 2] A schematic diagram showing the flow of fuel oil during fuel transfer by the fuel oil transfer device shown in Fig. 1. [Figure 3] A block diagram for explaining the configuration of a control unit used in the fuel oil transfer device shown in Figure 1. [Fig. 4] A line diagram for explaining the principle used for the determination of a predetermined condition implemented by the control unit as shown in Fig. 3. [FIG. 5] A schematic diagram of the configuration of the fuel oil transfer device described above is given to the on-off valve used to set the fuel oil transfer path on the premise of the configuration shown in FIG. 1 and a part of the configuration is described. [FIG. 6] A schematic diagram for explaining a transfer state of a fuel oil having a configuration shown in FIG. 5 as a target. [FIG. 7] A schematic diagram for explaining the constitution of the mixing of the fuel oil after heating as shown in FIG.

Claims (1)

A fuel oil transfer device, after the fuel oil transferred by a transfer pump is heated from at least one fuel oil storage tank to a fuel oil separation tank, the heated fuel oil is returned to the aforementioned one or The fuel oil storage tanks other than the fuel oil storage tanks can partially increase the temperature of the fuel oil in the fuel oil storage tanks by mixing with the fuel oil in the fuel oil storage tanks. A bellows transfer pipe opened at the bottom of the fuel oil storage tank and a part of the fuel oil that has been heated from the fuel oil separation tank is used in a heating section that heats the fuel oil flowing in the transfer pipe. The heating portion has a double tube structure using a bell mouth located at the end of the pipe of the transfer pipe and a pipe surrounding the periphery. The heated fuel oil from the fuel oil separation tank flows through the outer pipe portion, and The heated fuel oil in the fuel oil separation tank is discharged from the periphery of the bell mouth and sucked into the bell mouth.