JP7019172B2 - Fuel oil transfer device - Google Patents

Description

The present invention relates to a fuel oil transfer device, and more particularly to a fuel oil supply / discharge unit structure.

When the fuel oil used for the boiler of a ship or a generator is stored in the fuel oil storage tank, it is sucked into the transfer pipe by a member such as a bell mouth having a funnel shape having an opening located in the fuel oil. The bell mouth is a member having a shape in which a wide opening is directed downward to easily collect fuel oil (for example, Patent Document 1). Patent Document 1 discloses a configuration in which a plurality of horizontally protruding pieces are provided around a bell mouth to suppress a vortex flow generated during suction.

On the other hand, C heavy oil, which can be obtained at low cost, is known as one of the fuel oils. The viscosity of C heavy oil tends to change due to the influence of temperature. In particular, when the temperature is low, the viscosity becomes high, and the flow resistance when sucked and transferred increases. Therefore, even if the eddy current can be suppressed, it cannot be expected to reduce the flow resistance.

Japanese Unexamined Patent Publication No. 2013-141865 Japanese Unexamined Patent Publication No. 2012-017123

An object of the present invention is to provide a fuel oil transfer device having a configuration capable of reducing the flow resistance of fuel oil sucked and transferred from a fuel oil storage tank.

In order to solve this problem, in the present invention, the fuel oil transferred from at least one fuel storage tank to the fuel oil clarification tank by the transfer pump is heated, and then the heated fuel oil is heated by the flow pump. Fuel oil transfer that can partially raise the temperature of the fuel oil in the fuel oil storage tank by being returned to one or other fuel oil storage tanks and mixed with the fuel oil in the fuel oil storage tank. A transfer pipe having a bell mouth having an opening toward the bottom of the fuel oil storage tank at the end of the device, and a part of the heated fuel oil from the fuel oil clarification tank in the transfer pipe. A heating unit used for heating the fuel oil flowing into the fuel oil is provided, and the heating unit has a double-tube structure with a bell mouse located at the end of the transfer pipe and a pipe surrounding the bell mouth, and is on the outside. The heated fuel oil from the fuel oil clarification tank is flowed into the pipe portion, and the heated fuel oil from the fuel oil clarification tank is discharged from around the bell mouth and sucked into the bell mouth, and the double pipe is used. The heated fuel oil flowing through the outer pipe portion of the structure is characterized in that the fuel oil in the fuel oil storage tank is heated by using the wall surface of the outer pipe portion as a heat transfer portion.
Further, in the present invention, after the fuel oil transferred from at least one fuel oil storage tank to the fuel oil clear tank by the transfer pump is heated, the fuel oil heated by the flow pump is one or more of the above. A fuel oil transfer device capable of partially raising the temperature of the fuel oil in the fuel oil storage tank by being returned to the fuel oil storage tank and mixed with the fuel oil in the fuel oil storage tank. A transfer pipe having a bell mouth having an opening toward the bottom of the fuel oil storage tank at the end of the pipe, and a part of the heated fuel oil from the fuel oil clarification tank of the fuel oil flowing into the transfer pipe. A heating unit used for heating is provided, and the heating unit has a double-tube structure consisting of a bell mouse located at the tube end of the transfer tube and a tube surrounding the bell mouse, and the fuel is inside the outer tube. The heated fuel oil from the oil clarification tank is flowed, and the heated fuel oil from the fuel clarification tank is discharged from around the bell mouth and sucked into the bell mouth, and the outer pipe portion of the double pipe structure is formed. Is characterized in that, in the flow direction of the heated fuel oil, the size of the space between the vicinity of the lowermost surface of the bell mouth and the upstream side in the flow direction reaching this position is different from that of the outer wall surface of the inner pipe portion. It is supposed to be.
Further, in the present invention, after the fuel oil transferred from at least one fuel oil storage tank to the fuel oil clear tank by the transfer pump is heated, the fuel oil heated by the flow pump is one or more of the above. A fuel oil transfer device capable of partially raising the temperature of the fuel oil in the fuel oil storage tank by being returned to the fuel oil storage tank and mixed with the fuel oil in the fuel oil storage tank. A transfer pipe having an opening toward the bottom of the fuel oil storage tank at the end of the pipe, and a heating unit that uses a part of the heated fuel oil from the fuel oil clarification tank to heat the fuel oil flowing in the transfer pipe. , And the heating unit uses an inner tube portion located at the tube end portion of the transfer tube and a bell mouse double tube structure surrounding the inner tube portion, and the fuel is contained in the bell mouse. The heated fuel oil from the oil clarification tank is flowed, and the heated fuel oil from the fuel clarification tank is discharged from the periphery of the inner pipe portion and sucked into the inner pipe portion to have the double pipe structure. The inner tube portion is characterized in that the vicinity of the lowermost surface of the bell mouth is formed of a straight tube and a plurality of small holes are provided in the vicinity of the lowermost surface.
Further, in the present invention, after the fuel oil transferred from at least one fuel oil storage tank to the fuel oil clear tank by the transfer pump is heated, the fuel oil heated by the flow pump is one or more of the above. A fuel oil transfer device capable of partially raising the temperature of the fuel oil in the fuel oil storage tank by being returned to the fuel oil storage tank and mixed with the fuel oil in the fuel oil storage tank. A transfer pipe having a bell mouth having an opening toward the bottom of the fuel oil storage tank at the end of the pipe, and a part of the heated fuel oil from the fuel oil clarification tank of the fuel oil flowing into the transfer pipe. A heating unit used for heating is provided, and the heating unit is provided with a plurality of openings facing the lowermost surface of the bell mouse, and is characterized in that a pipeline through which heated fuel oil is flowed is used.

According to the present invention, the heated fuel oil from the fuel oil clarification tank is mixed and heated in the vicinity of the bell mouth of the transfer pipe inserted into the fuel oil storage tank, so that the fuel oil when sucked from the fuel oil storage tank is heated. The flow resistance of the fuel can be reduced.

It is a schematic diagram which shows the structure of the fuel oil transfer apparatus used in the fuel oil transfer system which concerns on embodiment of this invention, and the flow of fuel oil at the time of fuel oil heating. It is a schematic diagram which shows the flow of fuel oil at the time of fuel transfer executed by the fuel oil transfer apparatus shown in FIG. It is a block diagram for demonstrating the structure of the control part used in the fuel oil transfer apparatus shown in FIG. It is a diagram for demonstrating the principle used for the predetermined condition determination performed by the control unit shown in FIG. It is a schematic diagram for demonstrating the configuration of the fuel oil transfer system based on the configuration shown in FIG. 1. It is a schematic diagram for demonstrating the transfer state of fuel oil for the structure shown in FIG. It is a schematic diagram for demonstrating the structure concerning the mixing of the heated fuel oil shown in FIG. It is a figure for demonstrating another structure regarding the mixing of the heated fuel oil and the intake fuel oil shown in FIG. It is a figure for demonstrating another configuration with respect to the mixture shown in FIG. 7.

Hereinafter, embodiments for carrying out the present invention will be described.
FIG. 1 shows the principle configuration of the fuel oil transfer device 1 according to the embodiment for carrying out the present invention. The principle configuration described below is a configuration in which a part of the fuel oil stored in the fuel oil storage tank can be heated by the heated fuel oil to promote the decrease in viscosity. The fuel oil transfer device 1 includes a fuel oil clarification tank 3 and a fuel oil service tank 4 that communicate with a plurality of fuel oil storage tanks 2 including a pair. The fuel oil clarification tank 3 is a tank used for heating the fuel oil, and the fuel oil is heated to a temperature of 70 to 80 ° C. as an example by a heater (not shown).

The fuel oil storage tank 2 and the fuel oil clarification tank 3 are communicated with each other by a transfer pipe 5, and a transfer pump 6, a temperature sensor 7, and a pressure sensor 8 are arranged in the middle of the transfer pipe 5. The temperature sensor 7 measures, for example, the temperature on the fuel oil inlet side, the so-called 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 the change in flow resistance in response to the change in fuel oil viscosity. In particular, when the viscosity increases and the flow resistance increases, the pressure on the inlet side of the transfer pump 6 tends to be evacuated. Therefore, when a pressure change that tends to be evacuated is detected, heating is required to reduce the viscosity of the fuel oil. The fuel oil clarification tank 3 is provided with a level sensor 9 for detecting the liquid 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 clarification tank 3. The level sensor 9 is used to stop the drive of the transfer pump 6 when it detects that a predetermined amount of fuel oil has been introduced into the fuel oil clarification tank 3. The sensor is provided not only at the above-mentioned position but also inside the fuel oil storage tank 2. The sensors LG1 and LG2 are remaining amount sensors that detect the remaining amount of fuel in the fuel oil storage tank by the level or pressure.

The fuel oil service tank 4 is a tank used for purifying the heated fuel oil, temporarily storing it, and supplying 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 communicated with each other by a suction pipe 10, and a flow-down pump 11 is arranged in the middle thereof. A part of the fuel oil stored in the fuel oil service tank 4 is flowed down to the fuel oil storage tank 2 by the flow pump 11 to raise the temperature of the fuel oil in the fuel oil storage tank 2. The reason for the name of the flow-down pump 11 in this case is that the fuel oil service tank 4 is premised on a configuration in which the fuel oil service tank 4 is arranged at a higher position than the fuel oil storage tank 2. That is, the expression "flow down" is used to mean that the fuel oil is discharged from the upper fuel oil service tank 4 to the lower fuel oil storage tank 2 so as to flow down.

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

In the above fuel oil transfer device 1, the fuel oil sucked from the fuel oil storage tank 2 into the fuel oil clarification tank 3 by the transfer pump 6 is heated, and the heated fuel oil is cleaned and then the fuel oil service tank. The fuel oil introduced and stored in No. 4 is prepared for supply to an internal combustion engine or the like. A part of the fuel oil temporarily stored in the fuel oil clarification tank 3 and / or the fuel oil service tank 4 is returned to the fuel oil storage tank 2 by the 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 the present embodiment, for example, the transfer pump 6 is selected to operate for about 15 minutes and the flow-down pump 11 is operated for about 45 minutes alternately as the operating time of the pumps. Within 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 scavenging tank 3 described above. That is, when the liquid level of the fuel oil is detected by the level sensor 9 within the operating time when the fuel oil is flowed at a flow rate based on the rating such as the rotation speed and the drive current of the transfer pump 6, the flow resistance of the fuel oil is increased. It can be determined that the viscosity of the fuel oil does not occur, and if this operating time is exceeded, it can be determined that the viscosity of the fuel oil is high and the fluidity is poor. Further, when the level sensor 9 detects that the fuel oil introduced into the fuel oil clarification tank 3 has reached a predetermined amount, the operation of the transfer pump 6 is stopped to prevent the fuel oil from overflowing. When fuel oil is not consumed, such as during mooring, the operating 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 sucking fuel oil from the fuel oil storage tank 2 to the fuel oil clarification tank 3 using the transfer pump 6 are indicated by reference numerals F1 to F5 in FIG. Routes for flowing fuel oil from the fuel oil service tank 4 to the fuel oil storage tank 2 using the flow pump 11 are 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 Patent Document 2 which is the prior application of the applicant.

In the fuel oil transfer device 1 having the above configuration, a heating method for suppressing an increase in the flow resistance of the fuel oil is used. 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 executed by using the fuel oil transfer device 1 will be described.
The fuel oil transfer device 1 has either a normal operation mode executed when the viscosity of the fuel oil is low and the flow resistance is low, or a heating operation mode 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 that operates according to the operating state of the level sensor 9 and the flow-down pump 11 that supplies fuel oil into the fuel oil storage tank 2 are alternately operated to circulate the fuel oil. be. In the heating operation mode, the transfer pump 6 is forcibly stopped, the fuel oil blocked by 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. This mode also heats the fuel oil in the tank 2. It is desirable that the heating operation mode be executed until the viscosity of the fuel oil blocked 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, at least the temperature and pressure of the fuel oil sucked into the transfer pump 6 and the operating time of the transfer pump 6 are used as the parameters. As for the operating time of the transfer pump 6, as described above, the operating time until the level sensor 9 operates and the time counting time of the timer provided in the transfer pump 6 itself are referred to. When all or one or more of these parameters meet predetermined conditions requiring heating, the heating operation mode is executed.

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

In the control unit 20, a temperature sensor 7, a pressure sensor 8, and a 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 flow pump 11 are connected to the output side of the control unit 20, respectively. As the transfer pump 6 and the flow pump 11, a type capable of controlling the flow rate and the flow velocity by controlling the rotation of the motors (members indicated by the reference numerals M1 and M2 in FIGS. 1 and 2) is used.

In FIG. 3, reference numeral 15 is an operation panel used for displaying, for example, the operating time of each of the pumps 6 and 11 and the flow rate of the fuel oil, and for inputting necessary conditions such as the fuel consumption amount and the return amount. , Reference numeral 16 is a timer. The timer 16 measures, for example, the time required from the time when the transfer pump 6 starts to operate until the liquid level is detected by the level sensor 9. Therefore, when the operating time until the liquid level is detected 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 operating 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 include a timer for measuring the operating time by itself. 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 more than the operating time preset in its own timer. The transfer pump 6 is forcibly stopped when the preset operating time is exceeded, and is provided with the heating operation mode described later.

Further, as a monitoring target item used for a predetermined condition for determining that the viscosity of the fuel oil is a viscosity that increases the flow resistance, the drive current value of the motor used as the drive source of the transfer pump 6 can be targeted. The drive current value is determined to obtain the rotation speed and torque of the preset motor, but when the rotation speed or torque changes, it changes to return to the original state, especially the rotation speed. When the torque decreases, the drive current value increases. Therefore, by monitoring the case where the drive current value increases, it can be determined that the viscosity of the fuel oil has increased, and the operation mode can be switched.

The normal operation mode selected by the control unit 20 circulates the fuel oil while keeping it warm when the viscosity of the fuel oil is a value that does not increase the flow resistance. According to this operation mode, a state is maintained 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. The control unit 20 in the normal operation mode is applied to the temperature and pressure of the fuel oil introduced into the transfer pump 6, the operating time of the transfer pump 6, and the motor which is the drive source of the transfer pump 6. Monitor changes in drive current values. These monitored items are used as predetermined conditions for determining, for example, a change in the viscosity of the fuel oil, particularly an increase in the viscosity when the following four types of cases occur.
(1) When the viscosity of the fuel oil rises and reaches a temperature below the temperature at which the flow resistance increases.
(2) When the pressure change on the fuel oil introduction side of the transfer pump 6 is in a state where a vacuum tendency is generated.
(3) When the operating time of the transfer pump 6 until the level sensor 9 operates is lengthened.
(4) When the drive current value for the drive source of the transfer pump 6 is increasing.
The normal operation mode is executed when the viscosity of the fuel oil does not increase without satisfying these predetermined conditions. When the normal operation mode is executed, the cycle of sucking fuel oil from the fuel oil storage tank 2 to the fuel oil clear tank 3 and / or a part of the fuel oil in the fuel oil clear tank 3 and / or the fuel oil service tank 4 is used as the fuel oil storage tank. The cycle of flowing down to 2 is repeated alternately. 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 executing this operation mode are displayed on the operation panel 15.

When the monitoring of the above-mentioned monitored item is continued and the normal operation mode is executed, if any one or more of the predetermined conditions guided by the monitored item are matched, the normal operation mode is executed. Can be switched to the heating operation mode.

In the heating operation mode, the transfer pump 6 is forcibly stopped, and the flow pump 11 is operated to allow the heated fuel oil to flow into 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 dammed on the fuel oil suction side of the transfer pump 6. When the fuel oil flows back, for example, with respect to the filter (member represented by the reference numeral FT in FIG. 2), the fuel oil exerts a function of clearing the clogging of the filter.

The control unit 20 can directly monitor the temperature and pressure among the items to be monitored by the sensor, but the operating time of the transfer pump 6 until the liquid level is detected by using the level sensor 9 is the state shown in FIG. Determines 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 FIG. 4, as the viscosity of the fuel oil increases, the time until the level sensor 9 operates becomes longer when the transfer pump 6 has a constant output. Therefore, when the fuel oil having a low viscosity is introduced into the fuel oil clarification tank 3 and the time until the level sensor 9 operates (the time indicated by the reference numeral T in FIG. 4) is used as a reference, and the time becomes longer than that time. It can be determined that the viscosity of the fuel oil is high at (time indicated by reference numeral T1 in FIG. 4). When the transfer pump 6 itself is provided with a timer, it is determined that the viscosity of the fuel oil is high when the actual operating time is lengthened by comparing the set time of the timer with the actual operating time. be able to.

When the heating operation mode is selected when all or a part or a plurality of predetermined conditions derived from the monitored items are satisfied, the heated fuel oil is sent to the fuel oil storage tank 2. As a result, not only the fuel oil in the fuel oil storage tank 2 is directly mixed, but also the fuel oil blocked on the suction side of the transfer pump 6 can be mixed to raise the temperature of the fuel oil. As a result, the fuel oil is heated in the oil passage immediately before the fuel oil is sucked into the transfer pump 6, so that it is possible to secure a decrease in the viscosity of the fuel oil flowing into the transfer pump 6.

When the temperature, pressure, operating time of the transfer pump, and changes in the drive current value of the transfer pump motor reach the conditions where the increase in viscosity is eliminated and the specified conditions are no longer met, which are the items to be monitored, it is normal. Return to the operation mode.

Hereinafter, a modified example of the above-described embodiment will be described.
FIG. 5 is a diagram in which the on-off valve used for setting the fuel oil transfer path for the configuration shown in FIG. 1 is coded and a part of the configuration is added. The differences between the configuration shown in FIG. 5 and the configuration shown in FIG. 1 are as follows. That is, the fuel oil is transferred from the transfer source fuel oil storage tank 2A corresponding to one fuel oil storage tank to the transfer destination fuel oil storage tank 2B as a relationship in which both are directly communicated with each other. .. Specifically, in addition to using the suction pipe 10 communicating from the fuel oil clarification tank 3 shown in FIG. 1 to the fuel oil suction side of the transfer pump 6 as the first auxiliary inflow pipe, it branches at a part of the suction pipe 10. The point is to use 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.

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

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 further branches from the first auxiliary inflow pipe 10 to transfer to the fuel oil storage tank 2B. A detour 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 detour fuel oil passage 101. The detour 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 2B at the transfer destination. Therefore, the second auxiliary inflow pipe 100 and the detour fuel oil passage 101 directly take the fuel oil pumped 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 with. The first auxiliary inflow pipe 10 is provided with a first flow pump 11 that substitutes for the flow pump 11, and the second auxiliary inflow pipe 100 is provided with a second flow pump 110 in a detour fuel oil passage 101 communicating with the first auxiliary inflow pipe 10. Has been done. In the detour fuel oil passage 101 communicating with the first auxiliary inflow pipe 10 and the second auxiliary inflow pipe 100, the heaters 111 and 111H capable of heating the fuel oil on the fuel oil discharge side of the first and second flow pumps 11 and 110 Is provided.

On-off valves V1 to V8 for setting a fuel oil transfer route are arranged in the transfer pipe 5, the suction pipe 10 used as the first auxiliary suction pipe, the second auxiliary suction pipe 100, and the detour fuel oil passage 101. There is. The open / closed state of these on-off valves V1 to V8 is controlled by the control unit 20 used for the drive control of the transfer pumps 6 and the drive motors M1, M2 and M3 of the first and second flow-down pumps 11 and 110.

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

FIG. 6 shows the transfer state of the fuel oil at the time of transfer. When transferring the fuel oil, the heated fuel from the fuel oil clarification tank 3 is as shown in FIG. 6A in order to eliminate the low temperature of the fuel oil reaching the fuel oil storage tank 2B at the transfer destination. The oil is transferred to the fuel oil introduction side of the fuel oil storage tank 2B at the transfer destination. Such a fuel oil transfer path can be used as a fuel oil preheating oil path to the fuel oil storage tank 2B at the transfer destination. As a result, it is possible to obtain a state in which the increase in viscosity of the fuel oil transferred to the fuel oil storage tank 2B at the transfer destination is suppressed and the flow resistance is low. Therefore, this process is used as a preparation for the smooth transfer of fuel oil prior to transfer.
When the heated fuel oil is transferred from the fuel oil clarification tank 3 to the transfer destination fuel oil storage tank 2B, the control unit 20 opens the on-off valve V7 (see FIG. 5) to set the transfer path. The on-off valve 12 provided in the fuel oil clarification tank 3 is also opened to transfer the fuel oil.

Next, when the temperature of the fuel oil in the fuel oil storage tank 2B at the transfer destination has reached a temperature that does not cause an increase in viscosity due to preheating or has already reached a temperature that does not cause an increase in viscosity, the fuel oil storage tank 2A at the transfer source to the fuel oil storage tank 2B at the transfer destination Fuel oil is transferred toward. The transfer route shown in FIG. 6B is used for the transfer of fuel oil. That is, the second auxiliary inflow pipe 100 and the detour fuel oil passage 101 are used so that the fuel oil can be transferred from the fuel oil storage tank 2A of the transfer source to the fuel oil storage tank 2B of the transfer destination. The heater 111H provided in the detour fuel oil passage 101 is heated and controlled in order to prevent the temperature of the fuel oil flowing therein from becoming a temperature that causes an increase in viscosity. Therefore, it is possible to prevent the fuel oil flowing through the detour fuel oil passage 101 from reaching a temperature that causes an increase in viscosity due to the influence of heat dissipation and ambient temperature, so that the fuel oil can be transferred without increasing the flow resistance of the fuel oil. ..

In the present embodiment, by using a configuration in which the first auxiliary inflow pipe 10 communicates with the second auxiliary inflow pipe 100, the fuel flows through the detour fuel oil passage 101 as shown by the thin arrow in FIG. 6 (B). A part of the fuel oil can be diverted to the first auxiliary inflow pipe 10.
The amount of fuel oil flowing through the first auxiliary inflow pipe 10 is less than the amount of fuel oil flowing toward the detour fuel oil passage 101 with respect to the total amount of fuel oil transferred by the transfer pump 6, for example, about 30%. Is. Therefore, 70% of the fuel oil from the fuel oil storage tank 2A of the transfer source is transferred to the fuel oil storage tank 2B of the transfer destination, and 30% of the fuel oil less than this amount is sucked into the fuel oil of the transfer pump 6. Transferred 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 110 provided in the first auxiliary inflow pipe 10 is similar to the heater 111H provided in the detour fuel oil passage 101 in order to prevent the temperature of the flowing fuel oil from becoming a temperature that causes an increase in viscosity. The heating is controlled.

The control unit 20 opens the on-off valves V1, V3, V8, V7, and V6, V5 along the flow of fuel oil in order to set the transfer path shown in FIG. 6 (B). Among the on-off valves, the on-off valves V5 and V6 provided in the first auxiliary inflow pipe 10 are for the on-off valves V7 and V8 provided in the second auxiliary inflow pipe 100 and the detour fuel oil passage 101. The amount of opening is reduced and the oil passage is narrowed. In particular, by reducing the opening amount of the on-off valve V7 compared to the fully open on-off valve V8, the detour fuel oil passage 101 is narrowed down more than the second auxiliary inflow pipe 100, so that the fuel oil is directed toward the first auxiliary inflow pipe 100. Can be transferred. It is desirable that the opening amount of the on-off valve V7 is set to an amount at which the amount of fuel oil in the first auxiliary inflow pipe 100 described above can be obtained.
When the control unit 20 divides a part of the fuel oil flowing through the second auxiliary inflow pipe 100 into the first auxiliary inflow pipe 10, conditions different from the above-mentioned heating operation mode are used. 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. 6B is based on the premise that the transfer pump 6 continues to operate. .. 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. 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 of the fuel oil from dropping.

As described above, the features of the present embodiment, which targets the configuration capable of mixing the heated fuel oil with the fuel oil sucked from the fuel oil storage tank toward the transfer pump 6, are as follows. It is in. That is, a heating unit for heating the fuel oil taken into the bell mouth is provided near the bell mouth provided at the end of the transfer pipe 5.

Hereinafter, the configurations related to the features will be described.
FIG. 7 is a schematic diagram for explaining a state in which fuel oil flows for the fuel oil transfer device 1 provided with the plurality of fuel oil storage tanks shown in FIG. In FIG. 7A, the oil passage 10A used for recirculating the fuel oil heated by the fuel oil clarification tank 3 to one of the fuel oil storage tanks 2A is different from the case shown in FIG. It communicates with the fuel oil storage tank side pipe end portion 5A of the transfer pipe 5. As shown in FIG. 7B, the pipe end portion 5A of the transfer pipe 5 is provided with a funnel-shaped bell mouth 5A1 that opens toward the bottom in the fuel oil storage tank 2A. The oil passage 10A is used as a heating unit for heating a part of the heated fuel oil from the fuel oil clarification tank 3 to the pipe end portion 5A of the transfer pipe 5. That is, the oil passage 10A has a function of mixing the heated fuel oil with the fuel oil flowing in the pipe end portion 5A of the transfer pipe 5.

As a structure for mixing the heated fuel oil with the pipe end portion 5A of the transfer pipe 5, the structures shown in FIGS. 7B to 7E are adopted. 7 (B) and 7 (C) show a configuration in which a heating portion is provided on the outside of the fuel oil storage tank 2A by an oil passage 10A composed of a branch pipe that joins the pipe end portion 5A of the transfer pipe 5. It is shown. The fuel oil sucked from the bell mouth 5A1 is mixed with the heated fuel oil introduced from the oil passage 10A to raise the temperature and lower the viscosity (the arrows in FIGS. 7C to 7E are: The flow direction of the fuel oil and the heated fuel oil is shown, the arrow R1 indicates the direction in which the sucked fuel oil flows, the arrow R2 indicates the direction in which the heated fuel oil flows, and the arrow R3 indicates the suctioned fuel oil and the heated direction. The direction in which the fuel oil is mixed and flows is shown). In this configuration, if necessary, an oil passage 10A constituting a heating unit can be retrofitted to a transfer pipe 5 inserted through the fuel oil storage tank 2A.

In FIG. 7D, the fuel oil storage tank 2A is heated by an oil passage 10A composed of 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 configuration in which the part is provided is shown. The fuel oil sucked from the bell mouth 5A1 is mixed with the heated fuel oil introduced from the oil passage 10A in the same manner as in the configuration shown in FIG. 7 (C). In this configuration, since a part of the oil passage 10A is provided in the fuel storage tank 2A, in addition to the fuel oil sucked from the bell mouth 5A1, the fuel oil around the bell mouth 5A1 is also transmitted from the oil passage 10A. It is a structure that can be heated by heat.

In FIG. 7E, the pipe end portion 5A of the transfer pipe 5 inserted into the fuel oil storage tank 2 is provided with a heating portion by a double pipe structure of the bell mouth 5A1 and a pipe surrounding the bell mouth 5A1. The configuration is shown. In this configuration, the outer pipe portion communicates with the oil passage 10A. As a result, the heated fuel oil that has passed through the oil passage 10A is flowed to the outer pipe portion by the transfer pump 11, and is discharged from around the open end of the bell mouth 5A1 into the fuel oil storage tank 2A to become the fuel oil. Be mixed. The periphery of the oil passage 10A of the outer pipe portion, which is the passage of the heated fuel oil, is configured to be heated until it reaches the open end. As a result, the fuel oil sucked from the bell mouth 5A1 is mixed with the heated fuel oil discharged from the outer periphery of the bell mouth 5A1. In either configuration, the fuel oil in the fuel oil storage tank 2A can be heated by the heated fuel oil. In particular, not only the fuel oil sucked into the transfer pipe 5 and transferred to the fuel oil clarification tank 3 can be targeted, but also a part of the fuel oil stored in the fuel oil storage tank 2A can be heated. As a result, not only the fuel oil sucked and transferred to the bell mouth 5A1 but also the heating of the fuel oil before suction can be promoted to suppress the increase in viscosity.

When the heated fuel oil is flowed through the outer pipe portion communicating with the oil passage 10A in the double pipe structure, unlike the case where the heated fuel oil is flown through the inner pipe portion, not only in the bell mouth 5A1 but also in the bell mouth 5A1. The fuel oil in the peripheral part before being sucked by the bell mouth 5A1 can be heated. That is, since heat can be transferred to the fuel oil before being sucked by the bell mouth 5A1 by using the wall surface of the outer pipe portion, the fuel oil before being sucked by the bell mouth 5A1 can be heated as well as immediately after being sucked. In addition, when using a configuration in which the outer tube portion and the inner tube portion of the double pipe structure have their lower end openings aligned with the lowermost surface of the bell mouth, the fuel oil existing around the lowermost surface of the bell mouth 5A1 is used. Will have already been heated before being sucked. As a result, even if there is no space for mixing and heating the fuel oil on the lowermost surface of the bell mouth 5A1, the viscosity of the fuel oil is improved to a temperature that does not reduce the fluidity and then sucked.

FIGS. 8 and 9 show other configurations of the heating unit. The configuration shown in FIG. 8 is intended for the double tube structure of the bell mouth 5A shown in FIG. 7 (E). In the double pipe structure, as shown in FIG. 8A, the pipe end portion 5A having the bellmouth 5A1 serves as the inner pipe portion, and the heated fuel oil is returned to the fuel oil storage tank 2A in the oil passage 10A. Is used as the outer tube. The size of the space between the outer surface of the pipe end portion 5A used for the inner pipe portion and the inner surface of the oil passage 10A used for the outer pipe portion, that is, the so-called gap spacing is near the lowermost surface of the bell mouth 5A1 and this. The flow direction of the heated fuel oil to the position is different. That is, the gap d1 corresponding to the upstream side in the flow direction of the heated fuel oil and before reaching the inclined surface with respect to the gap d2 for the funnel-shaped inclined surface formed near the lowermost surface of the bell mouth 5A1 is formed. The relationship is set so that d1> d2. The flow rate of the heated fuel oil (indicated by reference numeral R2) flowing out from the lowermost surface side of the bell mouth 5A1 in which the small gap d2 is set with respect to the gap d1 is increased and the discharge pressure is increased. As a result, the heated fuel oil discharged from the portion of the gap d2 reaches a position far from the lowermost surface of the bell mouth 5A1 and can be diffused, so that the fuel oil before being sucked by the bell mouth 5A1 is efficiently heated. be able to.

In the configuration shown in FIG. 8B, a straight pipe is used for the pipe portion 5A inside the double pipe structure. That is, while the shape of the oil passage 10A used for the outer pipe portion is similar to that of the bell mouth 5A1, the pipe end portion 5A used for the inner pipe portion extends to the lowermost surface of the bell mouth 5A1. , It is composed of straight pipes with the same diameter.
A plurality of small holes 5A2 are provided along the height direction H in the portion parallel to the height H corresponding to the inclined surface forming the bell mouth 5A1 in the extension direction of the inner pipe portion 5A. According to this configuration, the heated fuel oil (indicated by reference numeral R2) flowing through the oil passage 10A used for the outer pipe portion is not only discharged outward from the lowermost end of the bell mouth 5A1 but also partially heated. The finished fuel oil is guided by the flow of fuel oil (indicated by reference numeral R1) sucked from the bell mouth 5A1 and enters the small hole 5A2 to be mixed with the fuel oil (indicated by reference numeral R2a). As a result, in addition to heating the fuel oil before being sucked by the bell mouth 5A1, it is possible to prevent a temperature drop of the sucked fuel oil and suppress a decrease in viscosity.

Hereinafter, another configuration of the heating structure will be described with reference to FIG.
The heating structure shown in FIG. 9 is characterized in that the bell mouth 5A1 is provided with a configuration in which the heated fuel oil is mixed in the fuel oil storage tank 2A separately from the transfer pipe 5 provided at the pipe end portion 5A. There is. As shown in FIG. 9A, a part of the oil passage 10A is extended to a position facing the lower surface of the bell mouth 5A1 to form an opposed extension portion 10A1 in the vicinity of the bell mouth 5A1. The facing extension portion 10A1 is a pipeline through which the heated fuel oil from the oil passage 10A flows, and a plurality of openings 10A1A are provided at positions facing the bell mouth 5A1. As shown in FIG. 9B, the heated fuel oil (indicated by reference numeral R2) flowing through the oil passage 10A is the fuel oil (indicated by reference numeral R1) sucked into the bell mouth 5A1 from the opening 10A1A of the facing extension portion 10A1. (Indicated by reference numeral R3). Moreover, since the oil passage 10A is arranged around the bell mouth 5A1, the fuel oil around the pipe end portion 5A is also heated. Therefore, not only the fuel oil sucked from the bell mouth 5A1 but also the fuel oil before suction is heated and the decrease in viscosity is suppressed.

According to the fuel oil transfer device according to 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, it is possible to surely suppress not only the decrease in viscosity due to heating of the fuel oil in the transfer process but also the increase in the viscosity of the fuel oil in the storage stage before the transfer.

Since the fuel oil transferred from the fuel oil storage tank can be heated not only in the transfer process but also in the stage before transfer, the present invention has high utility in that the increase in transfer resistance due to the increase in viscosity can be surely suppressed. In particular, it is possible to retrofit a configuration in which the fuel oil in the fuel oil storage tank is heated in the transfer process and in the stage before transfer, respectively, and it is highly possible to select a heating structure that is structurally suitable for the cost. In addition, it is possible to select the arrangement structure of the branch pipe that joins the pipe end of the transfer pipe or the double pipe structure with the transfer pipe that communicates with the bell mouth. As a result, it is highly possible that it does not need to be provided with a special structure such as a heater or a steam engine for heating the fuel oil before it is sucked into the bell mouth.

1 Fuel oil transfer device 2 Fuel oil storage tank 2A Fuel oil storage tank at the transfer source 2B Fuel oil storage tank at the transfer destination 3 Fuel oil clarification tank 4 Fuel oil service tank 5 Transfer pipe 5A Fuel oil storage tank side pipe end of the transfer pipe Part 5A1 Bellmouth 5A2 Small hole 6 Transfer pump 7 Temperature sensor 8 Pressure sensor 10 Suction pipe used for the first auxiliary inflow pipe 10A Oil channel used for the heating part 10A1 Opposing extension part 10A1A Opening 11 Flow pump equivalent to the first flow pump 20 Control unit 100 2nd auxiliary inflow pipe 101 Bypass fuel oil passage 110 2nd flow pump 111,111H Heater LG1, LG2 Remaining amount sensor V1 to V8 On-off valve

Claims (6)

After the fuel oil transferred by the transfer pump from at least one fuel oil storage tank to the fuel oil clarification tank is heated, the heated fuel oil is returned to the one or other fuel oil storage tank by the flow pump. It is a fuel oil transfer device capable of partially raising the temperature of the fuel oil in the fuel oil storage tank by being mixed with the fuel oil in the fuel oil storage tank.
A transfer pipe having a bell mouth at the end of the pipe having an opening toward the bottom of the fuel oil storage tank.
A heating unit that uses a part of the heated fuel oil from the fuel oil clarification tank to heat the fuel oil flowing in the transfer pipe is provided.
The heating portion uses a double pipe structure with a bell mouth located at the pipe end of the transfer pipe and a pipe surrounding the bell mouth, and the heated fuel oil from the fuel oil clarification tank is contained in the outer pipe portion. The heated fuel oil that has been washed away from the fuel oil clarification tank is discharged from around the bell mouth and sucked into the bell mouth.
The heated fuel oil flowing through the outer pipe portion of the double pipe structure is a fuel oil transfer device characterized in that the fuel oil in the fuel oil storage tank is heated by using the wall surface of the outer pipe portion as a heat transfer portion. After the fuel oil transferred by the transfer pump from at least one fuel oil storage tank to the fuel oil clarification tank is heated, the heated fuel oil is returned to the one or other fuel oil storage tank by the flow pump. It is a fuel oil transfer device capable of partially raising the temperature of the fuel oil in the fuel oil storage tank by being mixed with the fuel oil in the fuel oil storage tank.
A transfer pipe having a bell mouth at the end of the pipe having an opening toward the bottom of the fuel oil storage tank.
A heating unit that uses a part of the heated fuel oil from the fuel oil clarification tank to heat the fuel oil flowing in the transfer pipe is provided.
The heating portion uses a double pipe structure with a bell mouth located at the pipe end of the transfer pipe and a pipe surrounding the bell mouth, and the heated fuel oil from the fuel oil clarification tank is contained in the outer pipe portion. The heated fuel oil that has been washed away from the fuel oil clarification tank is discharged from around the bell mouth and sucked into the bell mouth.
The outer pipe portion of the double pipe structure has a large space between the vicinity of the lowermost surface of the bell mouth and the upstream side in the flow direction reaching this position in the flow direction of the heated fuel oil and the outer wall surface of the inner pipe portion. A fuel oil transfer device characterized by different sizes. In the fuel oil transfer device according to claim 2,
The size of the space between the outer pipe portion and the outer wall surface of the inner pipe portion is characterized in that the lowermost surface side of the bell mouth is smaller than the upstream side in the flow direction to reach this position in the flow direction of the heated fuel oil. Fuel oil transfer device. After the fuel oil transferred by the transfer pump from at least one fuel oil storage tank to the fuel oil clarification tank is heated, the heated fuel oil is returned to the one or other fuel oil storage tank by the flow pump. It is a fuel oil transfer device capable of partially raising the temperature of the fuel oil in the fuel oil storage tank by being mixed with the fuel oil in the fuel oil storage tank.
A transfer pipe having an opening toward the bottom of the fuel oil storage tank at the end of the pipe,
A heating unit that uses a part of the heated fuel oil from the fuel oil clarification tank to heat the fuel oil flowing in the transfer pipe is provided.
As the heating portion, a double pipe structure of a bell mouth located at the end of the transfer pipe and a bell mouth surrounding the inner pipe portion is used, and the fuel oil clarification tank is used in the bell mouth. The heated fuel oil is flushed, and the heated fuel oil from the fuel oil clarification tank is discharged from the periphery of the inner pipe portion and sucked into the inner pipe portion.
The inner pipe portion of the double pipe structure is a fuel oil transfer device characterized in that the vicinity of the lowermost surface of the bell mouth is formed of a straight pipe and a plurality of small holes are provided in the vicinity of the lowermost surface. In the fuel oil transfer device according to any one of claims 1 to 4.
A fuel oil transfer device characterized in that the lower end opening of the inner and outer pipe portions of the double pipe structure is aligned with the position of the lowermost surface of the bell mouth. After the fuel oil transferred by the transfer pump from at least one fuel oil storage tank to the fuel oil clarification tank is heated, the heated fuel oil is returned to the one or other fuel oil storage tank by the flow pump. It is a fuel oil transfer device capable of partially raising the temperature of the fuel oil in the fuel oil storage tank by being mixed with the fuel oil in the fuel oil storage tank.
A transfer pipe having a bell mouth at the end of the pipe having an opening toward the bottom of the fuel oil storage tank.
A heating unit that uses a part of the heated fuel oil from the fuel oil clarification tank to heat the fuel oil flowing in the transfer pipe is provided.
The fuel oil transfer device is characterized in that the heating unit is provided with a plurality of openings facing the lowermost surface of the bell mouth, and a pipeline through which heated fuel oil is flowed is used.

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