Cargo oil pump tank sweeping system and ship

Abstract

The present invention belongs to the technical field of ship equipment, and discloses a cargo oil pump tank stripping system and a ship. The cargo oil pump tank stripping system comprises a cargo oil main pipe, a cargo oil branch pipe and a tank stripping suction port. A cargo oil pump is installed on the cargo oil main pipe. The cargo oil pump tank stripping system also comprises a tank stripping branch pipe, a stripping line main pipe, a first stripping line branch pipe, a negative pressure system and a purge pipeline. One end of the tank stripping branch pipe extends into the suction well, and the other end is connected to the cargo oil branch pipe. A tank stripping valve is arranged on the tank stripping branch pipe; one end of the first stripping line branch pipe is connected to the cargo oil branch pipe, and the other end is connected to the stripping line main pipe, and a first stripping line valve is arranged on the first stripping line branch pipe; the negative pressure system is connected to the cargo oil main pipe, and can provide negative pressure to the cargo oil main pipe; the purge pipeline is connected to the cargo oil main pipe, and can provide compressed gas to the cargo oil main pipe, and a purge valve is arranged on the purge pipeline. The cargo oil pump tank stripping system can deeply purge the residual liquid in the suction well of the cargo oil tank and the residual liquid in the cargo oil main pipe and cargo oil branch pipe, thereby minimizing the residual amount of tank stripping.

Description

Technical Field

[0001] The present invention relates to the technical field of ship equipment, and in particular to a cargo oil pump tank sweeping system and a ship. Background Art

[0002] At present, existing chemical tankers often use complex deep well pumps or immersion pump systems to sweep chemical tanks, so as to achieve a single tank (including pipelines) with a chemical residual volume of less than 75 liters to meet the requirements of the International Convention for the Prevention of Pollution from Ships (MARPOL). Centralized cargo oil pumps are mainly used in crude oil tanks and finished oil tanks. When using centralized cargo oil pumps to sweep tanks, the residual volume of a single tank (including pipelines) after sweeping is much greater than 75 liters. The design of the existing centralized cargo oil pump system cannot meet the requirement of a single tank residual volume of less than 75 liters for chemical tankers, making it impossible for ships with centralized cargo oil pump systems to transport chemicals. Their use has limitations and they do not have competitive advantages. Summary of the invention

[0003] The object of the present invention is to provide a cargo oil pump tank stripping system and a ship, so as to solve the problem of large residual volume of tank stripping in a centralized cargo oil pump system.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] On the one hand, a cargo oil pump tank stripping system is provided, comprising a cargo oil main pipe, a cargo oil branch pipe and a tank stripping suction port, wherein a cargo oil pump is installed on the cargo oil main pipe, the cargo oil branch pipe is connected to the cargo oil main pipe and extends into a suction well; the tank stripping suction port is connected to the cargo oil branch pipe and extends into the suction well, and the cargo oil pump tank stripping system comprises:

[0006] a tank stripping branch pipe, one end of which extends into the suction well and the other end is connected to the cargo oil branch pipe, and a tank stripping valve is provided on the tank stripping branch pipe;

[0007] Line sweeping master;

[0008] a first sweeping branch pipe, one end of which is connected to the cargo oil branch pipe, and the other end of which is connected to the sweeping main pipe, and a first sweeping valve is provided on the first sweeping branch pipe;

[0009] a negative pressure system connected to the cargo oil main pipe and configured to provide negative pressure to the cargo oil main pipe;

[0010] The purge pipeline is connected to the cargo oil main pipe and is configured to provide compressed gas to the cargo oil main pipe. A purge valve is provided on the purge pipeline.

[0011] Optionally, the cargo oil pump tank sweeping system also includes a second sweeping line branch pipe, one end of the second sweeping line branch pipe is connected to the cargo oil main pipe, and the other end is connected to the sweeping line main pipe, and the second sweeping line branch pipe is provided with a second sweeping line valve.

[0012] Optionally, the negative pressure system comprises a vacuum tank and a liquid detection device connected in series, and a main pipe suction stop valve is provided at the connection between the liquid detection device and the cargo oil main pipe.

[0013] Optionally, the liquid detection device includes a liquid detection cabinet and a float switch, and the float switch is installed on the liquid detection cabinet.

[0014] Optionally, a vacuum stop valve and an air intake stop valve are provided on the vacuum tank, and the air intake stop valve is connected to the liquid detection device.

[0015] Optionally, a first pressure sensor is provided on the vacuum tank.

[0016] Optionally, a second pressure sensor is provided on the purge line.

[0017] Optionally, a purge hose connector valve is provided at one end of the purge line away from the cargo oil main pipe.

[0018] Optionally, a plurality of groups of cargo oil tanks are provided, and a suction well is correspondingly provided in each group of cargo oil tanks, and the cargo oil branch pipe, the tank stripping suction port, the tank stripping branch pipe and the first stripping line branch pipe correspond one-to-one to the cargo oil tanks.

[0019] On the other hand, a ship is provided, comprising the cargo oil pump stripping system described above.

[0020] Beneficial effects of the present invention:

[0021] The cargo oil pump tank sweeping system of the present invention can deeply sweep the residual liquid in the suction well of the cargo oil tank and the residual liquid in the cargo oil main pipe and cargo oil branch pipe through the cooperation of the negative pressure system and the purge pipeline, so that the residual amount after tank sweeping meets the requirements of chemical tankers, and the tank sweeping residual amount is minimized, which provides the possibility for chemical tankers to adopt a centralized cargo oil pump tank sweeping system. The centralized cargo oil pump tank sweeping system solution becomes one of the optional solutions for chemical tankers, and has good actual ship application value.

[0022] The ship of the present invention comprises the cargo oil pump tank stripping system, and the ship meets the transportation conditions for transporting chemicals, and the residual volume after tank stripping can meet the requirements of chemical tankers, thereby increasing the competitive advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The schematic diagram of the existing cargo oil pump stripping system is shown in FIG.

[0024] Figure 2 It is a schematic diagram of a cargo oil pump tank sweeping scheme according to an embodiment of the present invention.

[0025] In the figure:

[0026] 1. Cargo oil main pipe; 11. Cargo oil pump; 2. Cargo oil branch pipe; 3. Tank sweeping suction port; 4. Tank sweeping branch pipe; 41. Tank sweeping valve; 5. Sweep line main pipe; 6. First sweep line branch pipe; 61. First sweep line valve; 7. Negative pressure system; 71. Vacuum tank; 711. Vacuum stop valve; 712. Air intake stop valve; 713. First pressure sensor; 72. Liquid detection device; 73. Main pipe suction stop valve; 8. Purge pipeline; 81. Purge valve; 82. Second pressure sensor; 83. Purge hose joint valve; 9. Second sweep line branch pipe; 91. Second sweep line valve. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] Figure 1 The figure shows a schematic diagram of a conventional cargo oil pump tank stripping system, which comprises a cargo oil main pipe 1, a cargo oil branch pipe 2 extending into a suction well in each cargo oil tank, a tank stripping suction port 3, and a cargo oil pump 11 installed on the cargo oil main pipe 1. Valve devices are arranged on the cargo oil main pipe 1, the cargo oil branch pipe 2 and the tank stripping suction port 3 pipelines. The cargo oil branch pipe 2 is connected to the cargo oil main pipe 1 correspondingly. When the cargo oil pump 11 is started to pump cargo oil out of the pump room, even if the pumping operation is completed, there is still a large amount of residue in the pipeline and the cargo oil tank, which does not meet the requirement of the International Convention for the Prevention of Pollution from Ships (MARPOL) that the residue volume is less than 75 liters.

[0033] In order to reduce the residual amount in the cargo tank and pipeline after the centralized cargo oil pump stripping is completed, so that it meets the MARPOL requirements and meets the transportation conditions for transporting chemicals, so that the cargo ship with the centralized cargo oil pump stripping system has a competitive advantage in the field, the cargo oil pump stripping system of this embodiment also includes a stripping branch pipe 4, a stripping line main pipe 5, a first stripping line branch pipe 6, a negative pressure system 7 and a purge pipeline 8. Figure 2 As shown, one end of the stripping branch pipe 4 extends into the suction well of the cargo oil tank, and the other end is connected to the cargo oil branch pipe 2, and a stripping valve 41 is provided on the stripping branch pipe 4; one end of the first stripping line branch pipe 6 is connected to the cargo oil branch pipe 2, and the other end is connected to the stripping line main pipe 5, and a first stripping line valve 61 is provided on the first stripping line branch pipe 6; the negative pressure system 7 is connected to the cargo oil main pipe 1, and can provide negative pressure to the cargo oil main pipe 1. The purge line 8 is connected to the cargo oil main pipe 1, and can provide compressed gas to the cargo oil main pipe 1, and a purge valve 81 is provided on the purge line 8.

[0034] When in use, first carry out conventional cargo oil unloading and tank sweeping operations, that is, pre-use Figure 1 The middle pipeline solution performs cargo oil tank unloading and tank sweeping operations, starts cargo oil pump 11 to pump cargo oil out of the pump room, and after the cargo oil pump 11 completes the pumping operation, there is a large amount of residual liquid in the pipeline and cargo oil tank that cannot be pumped out. At this time, close all valves on cargo oil main pipe 1 and cargo oil branch pipe 2 (i.e. close the valves). Figure 1, including closing the stripping suction port 3), opening the negative pressure system 7 and a stripping valve 41 in a cargo oil tank. Since the negative pressure system 7 is connected to the cargo oil main pipe 1 and provides negative pressure to the cargo oil main pipe 1, and the stripping branch pipe 4 has a small diameter and can be very close to the bottom of the suction well, it can absorb the residual liquid that the stripping suction port 3 cannot absorb, and the remaining residual liquid in the suction well can easily flow back into the cargo oil main pipe 1 through the stripping branch pipe 4 and the cargo oil branch pipe 2. When the vacuum degree of the negative pressure system 7 is significantly reduced, it means that the stripping branch pipe 4 in the current cargo oil tank has sucked in air and can no longer suck in residual liquid. At this time, the stripping valve 41 of the current cargo oil tank can be closed to stop stripping the tank, and then the stripping valves 41 in other cargo oil tanks can be opened to strip other cargo oil tanks, and the cargo oil main pipe 1 can be waited for. When the residual liquid in the cargo oil main pipe 1 is full to a certain extent, the negative pressure system 7 is closed, the purge valve 81 and the first sweep line valve 61 are opened, and the purge line 8 provides compressed air or nitrogen to the cargo oil main pipe 1, so that the large amount of residual liquid accumulated in the cargo oil main pipe 1 can flow into the sweep line main pipe 5 through the cargo oil branch pipe 2 and the first sweep line branch pipe 6, and be uniformly discharged to the cargo receiving end or residual oil tank outside the deck through the sweep line main pipe 5. After the residual liquid in the sweep line main pipe 5 is purged and emptied, the purge valve 81 and the first sweep line valve 61 are closed, the sweeping work of the cargo oil main pipe 1 is completed, the negative pressure system 7 and the sweeping valves 41 in other cargo oil tanks are reopened, and the above operation is repeated until all cargo oil tanks are cleaned. Finally, the first sweep line valves 61 are opened one by one, and then they are purged one by one in sequence to further clean the remaining residual in the pipeline.

[0035] The cargo oil pump tank stripping system can deeply purge the residual liquid in the suction well of the cargo oil tank and the residual liquid in the cargo oil main pipe 1 and the cargo oil branch pipe 2 through the cooperation of the negative pressure system 7 and the purge pipeline 8, so that the residual amount after tank stripping meets the requirements of chemical tankers, and the residual amount of tank stripping is minimized, which provides the possibility for chemical tankers to adopt a centralized cargo oil pump tank stripping system. The centralized cargo oil pump tank stripping system solution becomes one of the optional solutions for chemical tankers, which has good actual ship application value.

[0036] Preferably, if Figure 2 As shown in FIG. 1 , the cargo oil pump tank stripping system of this embodiment further includes a second stripping branch pipe 9, one end of the second stripping branch pipe 9 is connected to the cargo oil main pipe 1, and the other end is connected to the stripping main pipe 5, and a second stripping valve 91 is provided on the second stripping branch pipe 9. It can be understood that when the stripping line 8 blows air into the cargo oil main pipe 1, most of the residual liquid in the cargo oil main pipe 1 can be blown into the stripping main pipe 5 through the first stripping branch pipe 6, but there is still a small amount of residual liquid in the cargo oil main pipe 1 that cannot be blown out, such as Figure 2As shown, for example, a small amount of residual liquid is still accumulated in the cargo oil main pipe 1 located on the left side of the purge valve 81. Therefore, a second purge branch pipe 9 is arranged on the left side of the purge valve 81. When the purge line 8 is purge, the first purge valve 61 is opened and the second purge valve 91 is also opened. Part of the residual liquid can flow into the purge main pipe 5 through the second purge branch pipe 9 and be discharged through the purge main pipe 5, thereby further improving the purge effect.

[0037] Specifically, the negative pressure system 7 includes a vacuum tank 71 and a liquid detection device 72 connected in series. A vacuum stop valve 711 and an air intake stop valve 712 are arranged on the vacuum tank 71. The air intake stop valve 712 is connected to the liquid detection device 72. A main pipe air intake stop valve 73 is arranged at the connection between the liquid detection device 72 and the cargo oil main pipe 1. A first pressure sensor 713 is arranged on the vacuum tank 71. When the negative pressure system 7 needs to be activated, the vacuum stop valve 711 is first opened to make the inside of the vacuum tank 71 in a vacuum state. The vacuum degree of the vacuum tank 71 can be observed in real time through the first pressure sensor 713. If the vacuum degree of the vacuum tank 71 is significantly reduced, it means that the currently opened stripping branch pipe 4 has sucked in air and can no longer suck in residual liquid. The residual liquid in the current cargo oil tank has been sucked in. At this time, the stripping valve 41 of the current cargo oil tank can be closed, and the stripping valves 41 in other cargo oil tanks can be opened to perform stripping operations. The liquid detection device 72 is used to detect the fullness of the residual liquid in the cargo oil main pipe 1, which specifically includes a liquid detection cabinet and a float switch. The float switch is installed in the liquid detection cabinet. The liquid detection cabinet is connected to the cargo oil main pipe 1 through the main pipe suction stop valve 73, which can be understood. When the vacuum tank 71 is used to sweep each tank, the residual liquid in each cargo oil tank enters through the sweeping branch pipe 4 and accumulates in the cargo oil main pipe 1. When the cargo oil main pipe 1 is filled with residual liquid, under the vacuum effect of the vacuum tank 71, the accumulated liquid in the cargo oil main pipe 1 will enter the liquid detection small cabinet and trigger the float switch alarm. This means that the amount of residual liquid in the cargo oil main pipe 1 is relatively large. At this time, the main pipe suction stop valve 73 is closed, and the purge valve 81 and the first sweep line valve 61 are opened. Under the action of gas pressure, a large amount of residual liquid accumulated in the cargo oil main pipe 1 can flow into the sweep line main pipe 5 through the cargo oil branch pipe 2, the first sweep line branch pipe 6, the third sweep line branch pipe 9, and be uniformly discharged to the cargo receiving end or residual oil tank outside the deck through the sweep line main pipe 5. A second pressure sensor 82 is provided on the purge pipeline 8. When the second pressure sensor 82 shows that the pressure drops significantly, it means that the residual amount in the sweeping main pipe 5 has been discharged to the cargo receiving end or residual oil tank outside the deck, and the sweeping operation of the sweeping main pipe 5 is completed.

[0038] Optionally, a purge hose connector valve 83 is provided at one end of the purge pipeline 8 away from the cargo oil main pipe 1 to facilitate the connection of the purge pipeline 8 with the blowing device.

[0039] Optionally, for the convenience of operation, in addition to the valve devices in the cargo oil tank, which must use remote control valves, the valve devices in the pump room can also use remote control valves to reduce the number of times personnel enter the pump room and reduce risks.

[0040] Optionally, multiple groups of cargo oil tanks can be provided, and a suction well is correspondingly arranged in each group of cargo oil tanks. The cargo oil branch pipe 2, the tank cleaning suction port 3, the tank cleaning branch pipe 4 and the first tank cleaning branch pipe 6 correspond to the cargo oil tanks one by one. The attached figure of the present embodiment shows the status of four cargo oil tanks. Multiple cargo oil tanks can also be provided, including but not limited to the number shown in the attached figure of the present embodiment.

[0041] In addition, this embodiment also provides a ship, which includes the above cargo oil pump tank stripping system. The ship meets the transportation conditions for transporting chemicals, and the residual volume after tank stripping can meet the requirements of chemical tankers, thereby increasing competitive advantages.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cargo oil pump tank stripping system, comprising a cargo oil main pipe (1), a cargo oil branch pipe (2) and a tank stripping suction port (3), wherein a cargo oil pump (11) is installed on the cargo oil main pipe (1), the cargo oil branch pipe (2) is connected to the cargo oil main pipe (1) and extends into a suction well; the tank stripping suction port (3) is connected to the cargo oil branch pipe (2) and extends into the suction well, characterized in that: The cargo oil pump tank stripping system comprises: a tank stripping branch pipe (4), one end of the tank stripping branch pipe (4) extending into the suction well, and the other end connected to the cargo oil branch pipe (2), and a tank stripping valve (41) being provided on the tank stripping branch pipe (4); Sweep line master (5); a first sweeping branch pipe (6), one end of the first sweeping branch pipe (6) being connected to the cargo oil branch pipe (2), and the other end being connected to the sweeping main pipe (5), and a first sweeping valve (61) being provided on the first sweeping branch pipe (6); a negative pressure system (7), connected to the cargo oil main pipe (1) and configured to provide negative pressure to the cargo oil main pipe (1); a purge pipeline (8) connected to the cargo oil main pipe (1) and configured to provide compressed gas to the cargo oil main pipe (1); a purge valve (81) is provided on the purge pipeline (8); The negative pressure system (7) comprises a vacuum tank (71) and a liquid detection device (72) connected in series, and a main pipe suction stop valve (73) is provided at the connection between the liquid detection device (72) and the cargo oil main pipe (1); The liquid detection device (72) comprises a liquid detection cabinet and a float switch, wherein the float switch is installed on the liquid detection cabinet; The cargo oil pump tank stripping system further comprises a second stripping branch pipe (9), one end of the second stripping branch pipe (9) being connected to the cargo oil main pipe (1), and the other end being connected to the stripping main pipe (5), and a second stripping valve (91) being provided on the second stripping branch pipe (9); A plurality of groups of cargo oil tanks are provided, each group of cargo oil tanks has a corresponding suction well, and the cargo oil branch pipe (2), the tank stripping suction port (3), the tank stripping branch pipe (4) and the first stripping branch pipe (6) correspond to the cargo oil tanks one by one; When the vacuum degree of the negative pressure system (7) decreases significantly, the stripping valve (41) of the current cargo oil tank is closed to stop stripping the tank, and then the stripping valves (41) in other cargo oil tanks are opened to perform stripping operations on the other cargo oil tanks; When the float switch detects that there is a large amount of residual liquid in the cargo oil main pipe (1), the large amount of residual liquid accumulated in the cargo oil main pipe (1) is discharged to the outside of the deck through the sweep line main pipe (5) under the gas pressure of the purge line (8).

2. The cargo oil pump tank stripping system according to claim 1, characterized in that: The vacuum tank (71) is provided with a vacuum stop valve (711) and an air intake stop valve (712), and the air intake stop valve (712) is connected to the liquid detection device (72).

3. The cargo oil pump tank stripping system according to claim 1, characterized in that: The vacuum tank (71) is provided with a first pressure sensor (713).

4. The cargo oil pump tank stripping system according to claim 1, characterized in that: The purge line (8) is provided with a second pressure sensor (82).

5. The cargo oil pump tank stripping system according to claim 1, characterized in that: A purge hose joint valve (83) is provided at one end of the purge pipeline (8) away from the cargo oil main pipe (1).

6. A ship, characterized in that: A cargo oil pump stripping system comprising any one of claims 1-5.

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