Ventilation system of cargo hold of chemical tanker

Abstract

The utility model discloses a chemical tanker cargo hold ventilation system which comprises a fresh air processing system, a ventilation header pipe and a fresh air injection pipeline, the fresh air processing system is used for dehumidification and heating of fresh air, and an air outlet of the fresh air processing system is communicated with an air inlet of the fresh air injection pipeline through the ventilation header pipe. The fresh air injection pipeline is communicated with the cargo hold of the chemical tanker. According to the ventilation system of the cargo hold of the chemical tanker, external fresh air can be dehumidified and heated, dry hot air is obtained, and the dehumidification effect is good; dry air enters the cargo hold through the liquid cargo crossing pipe, the liquid cargo header pipe and the injection pipe, an air pipe does not need to be arranged along a cargo hold deck, and design and construction are simple.

Description

Technical Field

[0001] The utility model relates to the technical field of ship ventilation, in particular to a ventilation system for a cargo hold of a chemical ship. Background Art

[0002] Chemical tankers transport dangerous goods. If they want to transport different goods, they need to clean the cargo hold before loading, dehumidify the cargo hold through ventilation, accelerate its drying, and accelerate the discharge of dangerous gases in the cargo hold, so that the air in the cargo hold is safe, ensuring that the crew can safely enter the cargo hold for sampling and testing.

[0003] The main challenges faced by the ventilation system for dehumidification of chemical tankers' cargo holds are that there are many air ducts on the deck, which makes it difficult to arrange them; the dehumidification effect is poor; and it is inconvenient for crew members to operate. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a ventilation system for a cargo hold of a chemical tanker.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A ventilation system for a chemical tanker cargo hold comprises a fresh air treatment system, a ventilation main pipe and a fresh air injection pipeline. The fresh air treatment system is used for dehumidifying and heating the fresh air. The air outlet of the fresh air treatment system is connected to the air inlet of the fresh air injection pipeline through the ventilation main pipe, and the fresh air injection pipeline is connected to the chemical tanker cargo hold.

[0007] Furthermore, the fresh air treatment system includes a fresh air fan, a dehumidifier, a heater and at least one pressurized fan connected in sequence through pipes, at least one pressurized fan is connected in parallel, a first closing damper is connected to the pipeline between the dehumidifier and the heater, an air outlet of the pressurized fan is connected to the air inlet of the ventilation main through a pipeline, and a check air valve is provided on the pipeline between the pressurized fan and the ventilation main.

[0008] Furthermore, a second closing damper is connected in parallel with the dehumidifier through a pipeline.

[0009] Furthermore, the dehumidifier is an adsorption rotary dehumidifier, the dehumidifier is connected to a regeneration air heat exchanger, and the regeneration air heat exchanger uses steam heat exchange.

[0010] Furthermore, a defogger shutter is provided at the air inlet of the fresh air fan.

[0011] Furthermore, the heater uses steam heat exchange to heat the fresh air.

[0012] Furthermore, the number of the check air valves is two.

[0013] Furthermore, the fresh air injection pipeline includes a plurality of liquid cargo cross-pipes, a plurality of switch valves are arranged at intervals on the liquid cargo cross-pipes, a liquid cargo main pipe is connected between two adjacent switch valves, the outlet end of the liquid cargo main pipe is connected to the cargo oil pump, an injection pipe is connected to the middle of the liquid cargo main pipe through an injection valve, the outlet end of the injection pipe is communicated with the cargo hold, and a unloading valve is arranged on the liquid cargo main pipe located between the injection valve and the cargo oil pump; a plurality of ventilation interfaces are arranged at intervals on the side of the ventilation main pipe away from the fresh air treatment system, and the inlet ends of the plurality of liquid cargo cross-pipes are respectively connected to a ventilation interface.

[0014] Furthermore, the main ventilation pipe is arranged on one side of the oil collecting tray in the midship area of ​​the cargo hold deck, and the ventilation interface is connected to the liquid cargo cross pipe through a hose.

[0015] Compared with the prior art, the ventilation system for the cargo hold of a chemical tanker of the utility model has the following beneficial effects:

[0016] 1. The external fresh air can be dehumidified and heated to obtain dry hot air with good dehumidification effect;

[0017] 2. Taking into account different external working conditions, the dehumidifier can be stopped in winter to save energy;

[0018] 3. Dry air enters the cargo hold through the existing cargo cross pipe, cargo main pipe and injection pipe of the ship. It is not necessary to arrange air ducts along the cargo hold deck, which is simpler to design and build;

[0019] 4. Dry air is sent to the bottom of the cargo hold and discharged from the cargo hold hatch cover at the top, making it easier to discharge the humid air in the cargo hold and achieving a good dehumidification effect;

[0020] 5. The crew connects the hose to the oil collecting tray, which is simple and convenient to operate. The use of high-pressure centrifugal fans can ensure that sufficient air volume enters the cargo hold, and one is used and the other is reserved. When one fan fails, it can still be used normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a fresh air treatment system of a ventilation system of a cargo hold of a chemical tanker according to the utility model;

[0022] Figure 2 The utility model is a schematic structural diagram of a fresh air injection pipeline of a ventilation system of a cargo hold of a chemical tanker.

[0023] Among them, 1-fresh air fan, 2-dehumidifier, 3-heater, 4-pressurized fan, 5-defog shutter, 6-first closing air damper, 7-second closing air damper, 8-ventilation main pipe, 9-check air valve, 10-oil collecting tray, 11-liquid cargo cross pipe, 12-switch valve, 13-liquid cargo main pipe, 14-cargo oil pump, 15-injection pipe, 16-injection valve, 17-unloading valve, 18-ventilation interface. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1 As shown, a ventilation system for a chemical tanker cargo hold includes a fresh air treatment system, a ventilation main 8 and a fresh air injection pipeline. The fresh air treatment system is used for dehumidifying and heating the fresh air. The air outlet of the fresh air treatment system is connected to the air inlet of the fresh air injection pipeline through the ventilation main 8, and the fresh air injection pipeline is connected to the chemical tanker cargo hold.

[0026] The fresh air treatment system includes a fresh air fan 1, a dehumidifier 2, a heater 3 and two pressurized fans 4 which are connected in sequence through pipelines. A defogger shutter 5 is provided at the air inlet of the fresh air fan 1. The two pressurized fans 4 are connected in parallel. A first closing damper 6 is connected on the pipeline between the dehumidifier 2 and the heater 3. A second closing damper 7 in parallel with the dehumidifier 2 is connected through a pipeline. The air outlets of the two pressurized fans 4 are connected to the air inlet of a ventilation main pipe 8 through pipelines, and a check valve 9 is provided on the pipeline between the pressurized fan 4 and the ventilation main pipe 8.

[0027] The dehumidifier 2 is in the form of an adsorption wheel, and uses the regenerated air heated by steam to remove water vapor in the fresh air to obtain dry air; the heater 3 uses steam to heat the air to obtain hot air with a relatively low relative humidity, so that it has a higher drying ability; in winter, the outside air temperature is low and the moisture content is low. At this time, there is no need to start the dehumidifier 2. The air damper 2 can be opened and closed directly, and the air damper 1 can be closed to directly heat the fresh air to dehumidify the cargo hold; the booster fan 4 is a high-pressure centrifugal fan, one for use and one for standby, which delivers the hot air to the ventilation main 8; the ventilation main 8 is located on the outside of the oil collecting pan 10, and the crew can stand on the oil collecting pan 10 and use a hose to connect the ventilation main 8 and the ventilation interface of the liquid cargo cross pipe 11.

[0028] The fresh air injection pipeline includes a plurality of liquid cargo cross-over pipes 11, on which a plurality of switch valves 12 are arranged at intervals, a liquid cargo main pipe 13 is connected between two adjacent switch valves 12, the outlet end of the liquid cargo main pipe 13 is connected to a cargo oil pump 14, an injection pipe 15 is connected to the middle of the liquid cargo main pipe 13 through an injection valve 16, the outlet end of the injection pipe 15 is communicated with the cargo hold, and a discharge valve 17 is arranged on the liquid cargo main pipe 13 between the injection valve 16 and the cargo oil pump 14; a plurality of ventilation interfaces 18 are arranged at intervals on a side of the ventilation main pipe 8 away from the fresh air treatment system, and the inlet ends of the plurality of liquid cargo cross-over pipes 11 are respectively connected to a ventilation interface 18; the ventilation main pipe 8 is arranged on one side of an oil collecting tray 10 located in the midship area of ​​the cargo hold deck, and the ventilation interface 18 is connected to the liquid cargo cross-over pipe 11 through a hose.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ventilation system for a cargo hold of a chemical tanker, characterized in that: It includes a fresh air treatment system, a ventilation main and a fresh air injection pipeline. The fresh air treatment system is used for dehumidification and heating of fresh air. The air outlet of the fresh air treatment system is connected with the air inlet of the fresh air injection pipeline through the ventilation main, and the fresh air injection pipeline is connected with the cargo hold of the chemical ship; the fresh air treatment system includes a fresh air fan, a dehumidifier, a heater and at least one pressurized fan connected in sequence through pipelines, at least one pressurized fan is connected in parallel, a first closing damper is connected on the pipeline between the dehumidifier and the heater, the air outlet of the pressurized fan is connected with the air inlet of the ventilation main through a pipeline, and a check valve is provided on the pipeline between the pressurized fan and the ventilation main.

2. A chemical tanker cargo hold ventilation system according to claim 1, characterized in that: A second closing damper is connected in parallel with the dehumidifier through a pipeline.

3. A chemical tanker cargo hold ventilation system according to claim 1, characterized in that: The dehumidifier adopts an adsorption rotary dehumidifier, and the dehumidifier is connected to a regeneration air heat exchanger, and the regeneration air heat exchanger adopts steam heat exchange.

4. A chemical tanker cargo hold ventilation system according to claim 1, characterized in that: A defogger shutter is provided at the air inlet of the fresh air fan.

5. A chemical tanker cargo hold ventilation system according to claim 1, characterized in that: The heater uses steam heat exchange to heat the fresh air.

6. A chemical tanker cargo hold ventilation system according to claim 1, characterized in that: The number of the check air valves is two.

7. A chemical tanker cargo hold ventilation system according to claim 1, characterized in that: The fresh air injection pipeline includes a plurality of liquid cargo cross-over pipes, a plurality of switch valves are arranged at intervals on the liquid cargo cross-over pipes, a liquid cargo main pipe is connected between two adjacent switch valves, the outlet end of the liquid cargo main pipe is connected to the cargo oil pump, an injection pipe is connected to the middle of the liquid cargo main pipe through an injection valve, the outlet end of the injection pipe is communicated with the cargo hold, and a unloading valve is arranged on the liquid cargo main pipe located between the injection valve and the cargo oil pump; a plurality of ventilation interfaces are arranged at intervals on a side of the ventilation main pipe away from the fresh air treatment system, and the inlet ends of the plurality of liquid cargo cross-over pipes are respectively connected to a ventilation interface.

8. A chemical tanker cargo hold ventilation system according to claim 7, characterized in that: The main ventilation pipe is arranged on one side of the oil collecting tray located in the midsection area of ​​the cargo hold deck, and the ventilation interface is connected to the liquid cargo cross pipe through a hose.

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