KR101769478B1 - Heating device of heavy fuel oil storage - Google Patents

Heating device of heavy fuel oil storage Download PDF

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Publication number
KR101769478B1
KR101769478B1 KR1020150111267A KR20150111267A KR101769478B1 KR 101769478 B1 KR101769478 B1 KR 101769478B1 KR 1020150111267 A KR1020150111267 A KR 1020150111267A KR 20150111267 A KR20150111267 A KR 20150111267A KR 101769478 B1 KR101769478 B1 KR 101769478B1
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KR
South Korea
Prior art keywords
heavy oil
line
heating
unit
storage tank
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KR1020150111267A
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Korean (ko)
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KR20170018198A (en
Inventor
주영남
임상운
조은주
전지숙
Original Assignee
주식회사 케이아이엔티
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Priority to KR1020150111267A priority Critical patent/KR101769478B1/en
Publication of KR20170018198A publication Critical patent/KR20170018198A/en
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Publication of KR101769478B1 publication Critical patent/KR101769478B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • B65D88/748—Large containers having means for heating, cooling, aerating or other conditioning of contents for tank containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02—Driving gear
    • B66D1/12—Driving gear incorporating electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/125—Fuel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes

Abstract

The present invention relates to a heating apparatus for a heavy oil storage tank, and more particularly, to a heating apparatus for a heavy oil storage tank which is installed on a cover of a heavy oil storage tank and heats the heavy oil.
The heating apparatus of the heavy oil storage tank of the present invention has a merit that the heating time of the heavy oil can be shortened because the time for transferring the heat is shortened by heating the heavy oil from the middle of the storage space of the heavy oil storage tank.
In addition, since the heating apparatus for the heavy oil storage tank of the present invention is installed in the lid, it is easy to install and can be separated from the heavy oil storage tank.

Figure R1020150111267

Description

Technical Field [0001] The present invention relates to a heating apparatus for heavy oil storage,

The present invention relates to a heating apparatus for a heavy oil storage tank, and more particularly, to a heating apparatus for a heavy oil storage tank which is installed on a cover of a heavy oil storage tank and heats the heavy oil.

Heavy oil is oil that is distilled from crude oil and distilled from LPG, gasoline, kerosene, light oil, etc., and is used mainly for diesel engine, boiler heating, and thermal power generation.

Heavy oil is classified into three types, heavy oil A, heavy oil B, and heavy oil C depending on specific gravity and viscosity.

Heavy oil has higher boiling point than kerosene and light oil, so it is not easily burned. However, the heat value is twice that of coal, and the heat is excellent. In terms of price, 1 ton of heavy oil can be compared with 2 ~ 3 tons of coal, Is less than that of coal, so that the heat loss due to excess air is small. In addition, since the advantage of fluid fuel is easier to control and the fuel is easier to collect than heavy fuel oil, demand for coal is increasing rapidly.

The heavy oil is stored in the fuel tank and then transported to the place where the fuel is needed. Since the heavy oil has a high viscosity at room temperature, it is difficult to transport the heavy oil.

Generally, a heating device is used in which a heating line is installed on the bottom surface of a heavy oil storage tank to lower the viscosity of the heavy oil.

The heating device heats the heavy oil in the heavy oil storage tank while the heating line is heated by a steam supply method or an electric heating method.

Korean Patent Publication No. 10-1506538 discloses a heating device for a storage tank.

Most of the heating apparatuses described above have disadvantages in that the heating line is installed only on the bottom or one side of the heavy oil storage tank and takes about 10 to 24 hours to heat the heavy oil located in the upper portion of the heavy oil storage tank.

Korean Patent Publication No. 10-1053069 discloses a heating apparatus for Bunker C engine for engine.

Such a heating device is installed inside the tank, and it is difficult to determine whether there is a failure, and since the process is complicated, the operation time and cost are increased, and maintenance and repair are not easy.

Korean Registered Patent No. 10-1506538: Heating device for storage tank Korean Registered Patent No. 10-1053069: Bunker C for Engine Oil Heating Device

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a heavy oil storage tank which is capable of being installed in a lid for opening and closing a heavy oil injection port formed in a heavy oil storage tank and being detachable from the heavy oil storage tank, It is an object of the present invention to provide a heating apparatus for a heavy oil storage tank capable of shortening a heating time by heating heavy oil.

According to an aspect of the present invention, there is provided a heating apparatus for a heavy oil storage tank, the apparatus being installed in a lid coupled to a heavy oil injection unit formed in a heavy oil storage tank having a storage space, A heating unit coupled to the lid to heat the heavy oil to lower the viscosity, and an operation unit mounted on the lid to control power supply of the heating unit.

The heating unit includes a support line installed on the cover and extending to the storage space, a connection member mounted on a lower portion of the support line, and a hinge provided radially to the connection member about the support line, A plurality of sockets coupled to the sockets, and a plurality of heater lines respectively connected to the sockets.

The heating unit includes a rotating means for rotating the heater line in a folded state in which each end of the heater line is close to the support line or in a deployed state in which the end is spaced apart from the outer circumferential surface of the support line.

The sliding unit includes a sliding movement portion slidably mounted on an outer circumferential surface of the supporting line, a plurality of guide lines hinged to one side of the sliding portion and hinged to the heater line on the other side, And an elevating unit for elevating the elevating unit on the supporting line.

Wherein the lifting / lowering unit includes a driving motor mounted on the cover and having a driving shaft, one side connected to the sliding portion and the other side connected to the driving shaft so as to be wound or unwound on the driving shaft according to the rotating direction of the driving motor, And first and second wires for moving the moving part along the support line.

The heating apparatus of the heavy oil storage tank of the present invention has an advantage of shortening the heating time of the heavy oil by shortening the time for transferring the heat by heating the heavy oil from the middle of the storage space of the heavy oil storage tank.

In addition, since the heating apparatus for the heavy oil storage tank of the present invention is installed in the lid, it is easy to install and can be separated from the heavy oil storage tank.

1 is a partially cut away perspective view of a heating apparatus for a heavy oil storage tank according to an embodiment of the present invention,
Fig. 2 is a perspective view of the heating apparatus applied to Fig. 1,
FIG. 3 is a partial perspective view showing a separated state of the socket and the heater line applied to FIG. 1. FIG.

Hereinafter, a heating apparatus for a heavy oil storage tank according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partially cut away perspective view of a heating apparatus for a heavy oil storage tank according to an embodiment of the present invention. FIG. 2 is a perspective view of a heating apparatus applied to FIG. 1, and FIG. Fig. 6 is a partial perspective view showing the separated state of the applied socket and the heater line.

A heating apparatus according to an embodiment of the present invention is installed in a lid 20 coupled with a heavy oil injection unit 11 formed in a heavy oil storage tank 10 having a storage space 13.

The heating apparatus according to the present invention uses electricity and includes a heating unit 100, an operation unit 200, and a power supply unit 300.

The heating unit 100 is coupled to the lid 20 so as to be positioned in the storage space 13 when the lid is coupled to the heavy oil injection unit 11, thereby heating the heavy oil to lower the viscosity.

The lid 20 has a disk shape corresponding to the heavy oil injection portion 11 so as to open and close the storage space.

The heating unit 100 includes a supporting line 120, a connecting member 130, a socket 140, a plurality of heater lines 150, and a rotating unit 160.

The support line 120 is in the form of a pipe and is installed in a portion of the lid 20 facing the inner peripheral surface of the heavy oil storage tank 10 when the lid 20 is mounted on the heavy oil storage tank 10 and extends to the storage space 13 Section.

In the support line 120, an electric wire (not shown) connected to the operation unit 200 and the power supply unit 300 to be described later is extended to the lower end.

The connection member 130 is installed at a lower portion of the support line 120. The upper portion of the connection member 130 has a diameter larger than that of the support line and has a conical shape whose diameter becomes narrower toward the lower side.

The connection member 130 has a plurality of cutting recesses 131 formed at regular intervals along the circumferential direction about the support line 120 at the upper portion.

The cutout groove 131 is a portion to which a socket 140 described below is rotatably coupled and the upper surface of the connecting member 130 and the upper surface connected to the upper surface are drawn inward by a predetermined length.

(Not shown) drawn in a direction away from each other are formed at mutually corresponding positions formed on the inner side surfaces facing each other formed by the cutting groove 131.

The connecting member 130 is provided with a wire extending in the support line 120 therein.

Although the connecting member 130 according to the embodiment of the present invention is a conical shape whose diameter is narrowed down to the bottom, it is not limited to the shape as long as the socket described below can be coupled and rotated.

The plurality of sockets 140 are radially installed on the connecting member 130 around the supporting line 120, and are hinged to the connecting member 130.

The socket 140 has a cylindrical shape, and first and second coupling protrusions (not shown) perpendicular to the outer circumferential surface and protruding in a direction away from each other are formed on one side and the other side, respectively.

The socket 140 is hinged to a plurality of cut-away grooves 131 formed in the connecting member 130, respectively.

The first and second coupling protrusions of the socket 140 are respectively inserted into the socket coupling grooves and are formed as pivot shafts on which the socket 140 can be pivoted and are polarly connected to the electric wires installed inside the coupling member 130, respectively.

The wires extending into the connecting member 130 each have a branched structure that can be connected to the socket.

Although not shown, a sealing structure is provided between the first and second coupling protrusions of the socket 140 and the socket coupling groove of the coupling member to prevent heavy oil from flowing into the coupling member 130.

At the end of the socket 140 in the direction away from the connecting member 130, there is formed a heater line coupling portion 141 to which the heater line 150 described later can be polarably coupled. (See Fig. 3)

The plurality of heater lines 150 are mounted on the heater line engaging portions 141 of the socket and are connected to the operating portion 200 to heat the heavy oil.

The heater line 150 has a round bar shape, and an electric coil is installed therein. A terminal 151 connected to an electric coil (not shown) protrudes at one end.

The heater line 150 is mounted on the socket 140 while the terminal 151 is coupled to the terminal groove 143 of the heater line engaging portion 141.

The pivoting means 160 may be arranged so that the heater line 150 mounted on the socket 140 is in a collapsed state in which the end of the heater line 150 in the direction away from the connecting member 130 approaches the support line 120, 120 in a unfolded state spreading apart from the outer peripheral surface.

The turning means 160 includes a sliding movement portion 161, a plurality of guide lines 165, and an elevation unit 170.

The sliding movement portion 161 is a portion slidably mounted on the outer circumferential surface of the support line 120.

The sliding movement portion 161 is in the form of a hollow cylinder and is inserted through the hollow through the support line 120,

The inner diameter of the sliding movement portion 161 is formed to be larger than the outer diameter of the support line 120.

A first hinge engaging portion 162, which can be hinged to a guiding line 165 to be described later, is formed on an outer circumferential surface of the sliding portion.

On the upper surface of the sliding portion 161, the first and second wires 175 and 177, which will be described later, are protruded upward at positions spaced apart from each other by a distance corresponding to the diameter of the sliding portion 161, The first and second wire coupling portions 163 and 164 are formed.

The plurality of guide lines 165 are hinged to one side of the sliding movement portion 161 and hinge-coupled to the other side of the heater line 150 to extend a predetermined length.

The guide line 165 is hinged to one side of the first hinge coupling part 162 and the other side of the guide line 165 is hinged to the second hinge coupling part 167 surrounding the outer circumferential surface of the heater line.

2, the second hinge engaging portion 167 is fixed to the heater line 120 to surround the outer circumferential surface of the heater line 120 and has a guide line 165 and a hinge coupling do.

The elevating unit 170 is a portion for lifting the sliding portion 161 from the supporting line 120.

The elevating unit 170 includes a driving motor 171 having a driving shaft 173 and first and second wires 175 and 177.

The drive motor 171 is mounted on the upper surface of the lid 20 together with the drive shaft 173.

The drive motor 171 is rotatable in both directions, and is equipped with a brake motor that, when the electric power is off, activates the brake, and when the electric power is on, the brake is released.

The driving motor 171 should be driven by a motor having a horsepower capable of overcoming the load of the rotating means 160, the heater line 150, the socket 140, and the like.

The upper surface of the lid 20 is formed with a driving shaft supporter 25 having a horizontal through hole to support and rotate the outer circumferential surface of the driving shaft 173, (27, 29) are formed.

One end of the drive shaft 173 is connected to the drive motor 171 and the other end is installed on the drive shaft support 25.

The first and second wires 175 and 177 are connected to the sliding portion 161 at one side and connected to the driving shaft 173 at the other side and are wound or unwound on the driving shaft 173 in accordance with the rotating direction of the driving motor 171 Thereby moving the sliding portion 161 up and down along the support line 120.

One end of each of the first and second wires 175 and 177 is connected to the first and second wire coupling portions 163 and 164 of the sliding portion 161. The other end of the first and second wires 175 and 177 is wound around the outer circumferential surface of the drive shaft, Respectively.

The first and second wires 175 and 177 may be made of a metal wire having a tensile force capable of holding a plurality of heater lines, a socket, a guide line, and a sliding portion.

The operation unit 200 is a part that is mounted on the lid 20 and controls power supply to the heating unit 110.

The operation unit 200 includes a heater switch 210, a temperature control unit 220, and first and second drive motor positions 230 and 240.

The heater switch 210 is mounted on the upper surface of the lid and is connected to an electric wire installed in the support line to act or shut off the heater line 150.

The first and second driving motor positions 230 and 240 are mounted on the upper surface of the lid 20 and are connected to the driving motor 171 to operate the driving motor 171. The driving shaft 173 rotates clockwise or counterclockwise .

The temperature control unit is provided to prevent overloading the electric wires installed in the heater line 150 or the heating device 100 and includes a temperature sensor (not shown) and a control unit 220.

The temperature sensor is installed adjacent to the electric coil installed inside the heater line 150. [

The control unit 220 is installed on the lid and serves to shut off or unblock the supply of electricity according to the temperature sensed by the temperature monitoring sensor.

The control unit 220 and the temperature sensor may be connected to each other via a support line and a connection member by wire or wirelessly.

The power supply unit 300 is a unit that supplies power necessary for heater line operation and drive motor operation.

Although the power supply unit 300 is connected by wire from the outside, a power supply unit of a battery type may also be applied.

Now, the operation of the heating apparatus for the heavy oil storage tank according to the embodiment of the present invention will be described.

Referring to FIG. 2, in order to position the heating apparatus according to the present invention in the storage space of the heavy oil storage tank, the heater line 150 is completed before the lid 20 is coupled to the heavy oil injection unit 11 do.

First, the first drive motor position 230 is operated to apply power to the drive motor to rotate the drive shaft 173 clockwise.

As the drive shaft 173 is rotated, the first and second wires 175 and 177 are wound on the outer circumferential surface of the drive shaft 173 to pull the sliding portion 161 in the direction of the lid 20.

The sliding movement portion 160 is moved upward to the upper portion of the support line 120 to pull the guide line 165 in the cover direction.

The guide line 162, in which the sliding movement is pulled up by the sliding portion 160, is rotated so that the lower end portion adjacent to the heater line 150 approaches the support line.

As the lower end of the guide line 165 approaches the support line 120, a pulling force is transmitted to the heater line 150 in the direction of the lid 20 or above the support line 120.

At this time, the heater line 150 is rotated by the socket 140 hinged to the connection member 140 to be in a folded state in which the end portion approaches the support line 120.

Also, as the heater line 150 approaches the support line 120, the guide line 165 approaches the end of the heater line 150 through the second hinge engagement portion 167.

Since the brake motor is applied to the drive motor 171, when the power supply is interrupted during operation, the brake is applied to the drive motor 171, so that sliding of the first and second wires can be prevented.

When the folded state of the heater line 150 is completed, the first driving motor position 230 is operated to interrupt the power to the driving motor to stop the rotation of the driving shaft, and the lid and the heavy oil injection unit are engaged.

Although the lid 20 and the heavy oil injection unit 11 according to the embodiment of the present invention are bolted to each other, a screw coupling method or a forced fit method may be applied.

When the lid 20 is coupled to the heavy oil injection portion 11, the heater line 150 is rotated to be in an unfolded state.

Power is applied to the drive motor 171 by using the second drive motor position 240 to rotate the drive shaft 173 counterclockwise.

The drive shaft 173 is rotated in the counterclockwise direction and a downward force is applied to the first and second wires 175 and 177 wound on the drive shaft 173 by the load of the heating unit 100, The wires 175 and 177 are released from the drive shaft 173.

The first and second wires 175 and 177 are disengaged and the heater line 150, the guide line 165 and the sliding movement unit 161 are rotated downward while gravity acts on the first and second wires 175 and 177.

The sliding movement portion 161 is moved in the direction away from the lid 20 and is positioned below the support line 120. [

The guide line 165 pushes the heater line 150 downward or away from the support line 120 as the sliding portion 161 descends.

At this time, the end portion of the heater line 150 is in the extended state away from the support line 120.

When the unfolded state of the heater line 150 is completed, the heater switch is operated to operate the heater line.

As the heater line 150 is operated, the heavy oil adjacent to or in contact with the heater line 150 begins to be heated and the heated temperature is transferred to the heavy oil stored in the storage space.

Since the heater line 150 of the heating device according to the present invention is formed in the middle of the storage space, it is advantageous in that the time for heating the heavy oil located in the upper and lower portions of the storage space can be shortened.

As shown in FIG. 1, the auxiliary heating device 400 may further be provided in the lower part of the storage space 13 to maximize the effect of shortening the time for heating the heavy oil.

The heating apparatus for the heavy oil storage tank according to the present invention has the advantage of shortening the heating time of the heavy oil by shortening the time for transferring the heat by heating the heavy oil from the middle of the storage space of the heavy oil storage tank.

In addition, since the heating apparatus of the heavy oil storage tank according to the present invention is installed in the lid, it is easy to install and can be separated from the heavy oil storage tank.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated that embodiments are possible.

Accordingly, the scope of the true technical protection of the present invention should be determined by the technical idea of the appended claims.

10: Heavy oil storage tank 11: Heavy oil injection part
13: Storage space 100: Heating unit
120: support line 130: connecting member
140: Socket 150: Heater line
160: rotating means 161:
165: Guide line 170: Lift unit
171: Driving motor 210: Heater switch
200: Operation part 300: Power supply part

Claims (5)

A heating unit which is installed on a lid coupled to a heavy oil injection unit formed in a heavy oil storage tank having a storage space and which is connected to the lid when the lid is coupled to the heavy oil injection unit to heat the heavy oil, and;
And an operation unit mounted on the cover to control power supply of the heating unit,
The heating unit
A support line installed on the cover and extending to the storage space,
A connection member mounted on a lower portion of the support line,
A plurality of sockets radially installed in the connection member about the support line and hinged to the connection member,
A plurality of heater lines respectively mounted on the socket and connected to the operating unit,
And a rotating means for rotating the heater line in a folded state in which each end of the heater line is close to the support line or in a deployed state in which the heater line is extended apart from the outer circumferential surface of the support line. Device. delete delete 2. The apparatus according to claim 1,
A sliding movement portion slidably mounted on the outer circumferential surface of the support line,
A plurality of guide lines hinged on one side of the sliding portion and hinged on the other side of the sliding portion,
And an elevating unit for elevating and lowering the sliding portion on the support line. The apparatus as claimed in claim 4, wherein the elevating unit
A drive motor mounted on the cover and having a drive shaft,
One end of which is connected to the sliding portion and the other end of which is connected to the driving shaft so as to be wound or unwound on the driving shaft in accordance with the rotational direction of the driving motor, Wherein the heating device is provided with a heating device for heating the heavy oil storage tank.
KR1020150111267A 2015-08-06 2015-08-06 Heating device of heavy fuel oil storage KR101769478B1 (en)

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KR102117852B1 (en) * 2018-07-02 2020-06-03 주식회사래티스테크놀로지 Fluid Tank Having Internal Vaporizers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203997594U (en) * 2014-08-12 2014-12-10 武洁 petroleum liquid power frequency heating device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101053069B1 (en) 2009-06-23 2011-08-01 이엔알 주식회사 Heating device for bunker C oil for power generation engine
KR101506538B1 (en) 2013-10-04 2015-03-27 대우조선해양 주식회사 Heating apparatus of storage tank

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203997594U (en) * 2014-08-12 2014-12-10 武洁 petroleum liquid power frequency heating device

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