Liquid cargo ship sweeping system meeting MARPROL requirements

Abstract

A liquid cargo ship cabin sweeping system meeting MARPROL requirements is characterized in that a liquid cargo deep-well pump and a heater are located in a cargo cabin area, the liquid cargo deep-well pump is provided with a cabin sweeping connector and a liquid cargo connector, the liquid cargo connector is connected with an inlet of the heater through a pipeline, the cabin sweeping connector is connected with a cabin sweeping pipeline and a liquid cargo discharging main pipe, and the liquid cargo discharging main pipe is connected with a liquid cargo collecting pipe area main pipe; the liquid cargo collecting area main pipe is provided with a liquid cargo by-pass pipeline, and the sweeping pipeline is communicated with the liquid cargo by-pass pipeline. A liquid cargo pump sweeping discharge valve is arranged at the position, close to the sweeping connector, of the sweeping pipeline, and a liquid cargo pump sweeping discharge valve is arranged at the position, close to the sweeping connector, of the liquid cargo discharge main pipe. According to the system, the special small-opening sweeping pipeline is additionally arranged in the system, liquid cargos are swept from the collecting pipe area to the cargo hold area and discharged out of the main pipe, the accumulated liquid cargos are discharged into the small-opening sweeping pipeline, the pipeline sweeping time is shortened, the workload of operators is reduced, the good sweeping effect can be achieved, and the standard requirement is met.

Description

Technical Field

[0001] The invention belongs to the field of ship construction and design, and in particular relates to a tank stripping system for a liquid cargo ship meeting the MARPROL requirements. Background Art

[0002] In the process of developing and designing liquid cargo ships, the concepts of energy saving, environmental protection, greenness and safety are always implemented. Chemical tankers have very strict regulations on the discharge of toxic liquid cargo residues, in order to avoid harm to marine resources or human health, or damage to the recreational environment or other legal uses at sea. Reducing the residual toxic liquid cargo in the cargo system is a key technology in the current international chemical tanker design.

[0003] The design of the tank stripping system, which has a vital impact on emissions, has always been a difficult point in the design of chemical tankers. The present invention proposes a new pipeline design for the stern pipeline of the manifold area, which is a difficult point in the tank stripping and blowing work, to reduce the workload of the tank stripping and blowing work. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a tank stripping system for a liquid cargo ship that meets the MARPROL requirements, and the technical solution adopted is:

[0005] A tank stripping system for a liquid cargo ship that meets the MARPROL requirements. A liquid cargo deep well pump (1) and a heater (2) are located in a cargo tank area. The liquid cargo deep well pump is provided with a tank stripping interface (1a) and a liquid cargo interface (1b). The liquid cargo interface is connected to an inlet of the heater via a pipeline. The tank stripping interface is respectively connected to a tank stripping pipeline (3) and a liquid cargo discharge main pipe (4). The liquid cargo discharge main pipe is connected to a liquid cargo manifold area main pipe (5). The liquid cargo manifold area main pipe is provided with a liquid cargo bypass pipeline. The tank stripping pipeline is connected to the liquid cargo bypass pipeline. A first connecting pipe is provided between the liquid cargo discharge main pipe and the tank stripping pipeline. A liquid cargo tank stripping pipeline access valve (103) is provided on the first connecting pipe.

[0006] A first liquid cargo pump tank stripping discharge valve (101) is arranged near the tank stripping interface of the tank stripping pipeline, a second liquid cargo pump tank stripping discharge valve (102) is arranged near the tank stripping interface of the liquid cargo discharge main pipe, and a first liquid cargo shore valve (111), a first manifold main pipe blow-off valve (109), a second liquid cargo shore valve (110), and a second manifold main pipe blow-off valve (112) are arranged near the connection of the liquid cargo bypass pipeline.

[0007] The heater outlet is connected to the liquid cargo discharge main pipe through a pipeline. The heater is provided with a heater bypass pipeline. The liquid cargo interface leads to the second connecting pipe of the liquid cargo discharge main pipe. A liquid cargo pump discharge outlet blow-off valve (105) and a liquid cargo pump discharge regulating valve (113) are sequentially arranged.

[0008] The above-mentioned tank stripping system for liquid cargo ships meeting the MARPROL requirement, further, the liquid cargo manifold area main pipe is located in the liquid cargo shore manifold area.

[0009] The above-mentioned tank stripping system for a liquid cargo ship that meets the MARPROL requirements further comprises a liquid cargo main line blow-off valve (104) disposed at the end of the liquid cargo discharge main line.

[0010] The above-mentioned tank stripping system for liquid cargo ships meeting the MARPROL requirements is further characterized in that a first manifold area main tank stripping pipeline access valve (107) and a second manifold area main tank stripping pipeline access valve (108) are provided at the positions where both ends of the liquid cargo bypass pipeline are connected to the liquid cargo manifold area main pipeline.

[0011] The above-mentioned tank stripping system for a liquid cargo ship that meets the MARPROL requirements further comprises a cargo tank heater discharge valve (106) disposed on the heater bypass pipeline.

[0012] The above-mentioned tank stripping system for a liquid cargo ship that meets the MARPROL requirements further comprises a liquid cargo inlet valve (116) provided on the pipeline connecting the heater outlet to the liquid cargo discharge main pipe.

[0013] The advantages of the present invention are:

[0014] Since the ship is in a trim state at the stern stage, a large amount of liquid cargo is accumulated in the liquid cargo discharge main pipe at the stern of the manifold area, and due to the influence of trim, it takes a long time to blow compressed air (nitrogen) from the cargo hold area to the manifold area, and a good blowing effect cannot be achieved. The present invention adds a special small-mouth tank sweeping pipeline to the system, blows the liquid cargo discharge main pipe from the manifold area to the cargo hold area, and the accumulated liquid cargo is discharged into the small-diameter blowing pipeline, which reduces the pipeline blowing time, reduces the workload of operators, and can achieve a good blowing effect, meeting the requirements of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system of the present invention;

[0016] Figure 2 , 3 , 4 are the three stages of tank sweeping;

[0017] Among them, 1-liquid cargo deep well pump, 1a-liquid cargo pump tank stripping interface, 1b-liquid cargo pump liquid cargo interface, 2-cargo tank heater, 3-liquid cargo tank stripping pipeline, 4-liquid cargo discharge main pipe, 5-liquid cargo manifold area main pipe, 6-cargo hold heater inlet pipeline, 7-cargo hold heater outlet pipeline, 101-first liquid cargo pump stripping discharge valve, 102-second liquid cargo pump stripping discharge valve, 103-liquid cargo stripping pipeline access valve, 104-liquid cargo main blow-off valve, 105-liquid cargo pump discharge outlet blow-off valve, 106-cargo hold heater discharge valve, 107-manifold area main stripping pipeline access valve, 108-manifold area main stripping pipeline access valve, 109-manifold area main blow-off valve, 110-manifold area main blow-off valve, 111-liquid cargo shore valve, 112-liquid cargo shore valve, 113-liquid cargo pump discharge regulating valve, 114-cargo hold heater inlet valve, 115-cargo hold heater outlet valve, 116-liquid cargo inlet valve, A-cargo hold area, B-liquid cargo shore header area, C-outboard. DETAILED DESCRIPTION

[0018] The present invention will be further described in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown in the figure, a tank stripping system for a tanker that meets the requirements of MARPROL is

[0020] The liquid cargo deep well pump 1 and the heater 2 are located in the cargo hold area. The liquid cargo deep well pump is provided with a stripping interface 1a and a liquid cargo interface 1b. The liquid cargo interface is connected to the heater inlet through a pipeline. The stripping interface is respectively connected to a stripping pipeline 3 and a liquid cargo discharge main pipe 4. The liquid cargo discharge main pipe is connected to a liquid cargo manifold area main pipe 5. The liquid cargo manifold area main pipe is located in the liquid cargo shore manifold area. The liquid cargo manifold area main pipe is provided with a liquid cargo bypass pipeline. The stripping pipeline is connected to the liquid cargo bypass pipeline. A first connecting pipe is provided between the liquid cargo discharge main pipe and the stripping pipeline. A liquid cargo stripping pipeline access valve 103 is provided on the first connecting pipe. A liquid cargo main pipe blow-off valve 104 is provided at the end of the liquid cargo discharge main pipe.

[0021] A first liquid cargo pump stripping discharge valve 101 is provided near the stripping interface of the stripping pipeline, a second liquid cargo pump stripping discharge valve 102 is provided near the stripping interface of the liquid cargo discharge main pipe, and a first liquid cargo shore valve 111, a first header area main pipe blow-off valve 109, a second liquid cargo shore valve 110, and a second header area main pipe blow-off valve 112 are provided near the connection of the liquid cargo bypass pipeline to the liquid cargo manifold area main pipe.

[0022] The heater outlet is connected to the liquid cargo discharge main pipe through a pipeline. The heater is provided with a heater bypass pipeline. The heater bypass pipeline is provided with a cargo tank heater discharge valve 106. The pipeline from the heater outlet to the liquid cargo discharge main pipe is provided with a liquid cargo inlet valve 116. The second connecting pipe from the liquid cargo interface to the liquid cargo discharge main pipe is provided with a liquid cargo pump outlet blow-off valve 105 and a liquid cargo pump discharge regulating valve 113 in sequence.

[0023] The first manifold area main tank stripping pipeline access valve 107 and the second manifold area main tank stripping pipeline access valve 108 are arranged at the positions where both ends of the liquid cargo bypass pipeline are connected to the liquid cargo manifold area main pipe.

[0024] like Figure 2 , 3 As shown in Figures 4 and 5, when the present invention is used, three stages of liquid cargo tank stripping are innovatively performed, so that the residual volume of tank stripping can fully meet the requirements of MARPOL Annex II for cargo X, Y or chemical tanker stripping system, and the residual volume of Z-type cargo in each tank and related pipeline is not more than 75L. The three stages of liquid cargo tank stripping are specifically as follows (taking the cargo passing to the port side as an example).

[0025] Before stripping, open the cargo hold heater drain valve to drain the residue in the cargo hold heater 2 into the cargo hold. Open the liquid cargo stripping pipeline access valve and liquid cargo shore valve 1, and start the liquid cargo pump 1 until no liquid cargo is discharged.

[0026] Stage 1: Discharge residual liquid cargo from cargo tank collection well

[0027] Open the blow-off valve 105 at the discharge outlet of the liquid cargo pump, connect the compressed air (nitrogen) to the valve, and at the same time open the second liquid cargo pump stripping discharge valve (main pipe) 102 and the liquid cargo shore valve 111, operate the liquid cargo pump at a low speed, suck the liquid cargo from the liquid cargo tank collecting well into the liquid cargo pump, and discharge the liquid cargo through the liquid cargo discharge main pipe 4 and the liquid cargo manifold area main pipe 5 by compressed air (nitrogen). When there is no residual liquid cargo to be discharged, go to stage 2;

[0028] Stage 2, main line purge (cargo hold area - header area)

[0029] Open the liquid cargo main blow-off valve 104 and the header area main blow-off valve 110, connect the compressed air (nitrogen) to the two valves, and when the compressed air (nitrogen) pressure reaches 6 kg, open the liquid cargo shore valve 111. When there is no residual liquid cargo to be discharged, go to stage 3;

[0030] Stage 3, main line purging (manifold area-cargo hold area-manifold area)

[0031] Open the manifold main blow-off valve 109, connect the compressed air (nitrogen) to the valve, and when the compressed air (nitrogen) pressure reaches 6 kg, open the liquid cargo stripping pipeline access valve 103 and the manifold main stripping pipeline access valve 107, and when there is no residual liquid cargo to be discharged, the stripping is finished. At this stage, due to the influence of the stern trim, the liquid cargo accumulates at the end of the liquid cargo discharge main pipe. The liquid cargo discharge main pipe is purged from the manifold area to the cargo tank area, and the accumulated liquid cargo is discharged into the small-diameter purge pipeline, which can more effectively discharge the residual liquid cargo in the liquid cargo discharge main pipe.

Claims

1. A tank stripping system for a tanker meeting the requirements of MARPROL, characterized in that: The liquid cargo deep well pump (1) and the heater (2) are located in the cargo hold area. The liquid cargo deep well pump is provided with a tank stripping interface (1a) and a liquid cargo interface (1b). The liquid cargo interface is connected to the heater inlet via a pipeline. The tank stripping interface is respectively connected to a tank stripping pipeline (3) and a liquid cargo discharge main pipe (4). The liquid cargo discharge main pipe is connected to a liquid cargo manifold area main pipe (5). The liquid cargo manifold area main pipe is provided with a liquid cargo bypass pipeline. The tank stripping pipeline is connected to the liquid cargo bypass pipeline. A first connecting pipe is provided between the liquid cargo discharge main pipe and the tank stripping pipeline. A liquid cargo tank stripping pipeline access valve (103) is provided on the first connecting pipe. A first liquid cargo pump stripping discharge valve (101) is provided near the stripping interface of the stripping pipeline, a second liquid cargo pump stripping discharge valve (102) is provided near the stripping interface of the liquid cargo discharge main pipe, and a first liquid cargo shore valve (111), a first header main pipe blow-off valve (109), a second liquid cargo shore valve (110), and a second header main pipe blow-off valve (112) are provided near the connection of the liquid cargo bypass pipeline. The heater outlet is connected to the liquid cargo discharge main pipe through a pipeline. The heater is provided with a heater bypass pipeline. The liquid cargo interface leads to the second connecting pipe of the liquid cargo discharge main pipe. A liquid cargo pump discharge outlet blow-off valve (105) and a liquid cargo pump discharge regulating valve (113) are sequentially arranged.

2. A tank stripping system for a liquid cargo ship meeting the MARPROL requirements according to claim 1, characterized in that: The liquid cargo collection area supervisor is located in the liquid cargo shore collection area.

3. A tank stripping system for a liquid cargo ship meeting the MARPROL requirements according to claim 1, characterized in that: A liquid cargo main pipe purge valve (104) is provided at the end of the liquid cargo discharge main pipe.

4. A tank stripping system for a tanker meeting the MARPROL requirements according to claim 1, characterized in that: A first manifold area main tank stripping pipeline access valve (107) and a second manifold area main tank stripping pipeline access valve (108) are provided at the positions where both ends of the liquid cargo bypass pipeline are connected to the liquid cargo manifold area main pipe.

5. A tank stripping system for a liquid cargo ship meeting the MARPROL requirements according to claim 1, characterized in that: A cargo hold heater discharge valve (106) is provided on the heater bypass pipeline.

6. A tank stripping system for a liquid cargo ship meeting the MARPROL requirements according to claim 1, characterized in that: A liquid cargo inlet valve (116) is provided on the pipeline connecting the heater outlet to the liquid cargo discharge main pipe.

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