DUST HANDLING SYSTEM
When bulk cargoes are being carried on supply vessels, a certain amount of the cement or other powder is usually lost from the conventional vent system.
Not only this loss is a waste, but also the amount of powder is usually released to the environment and would cause air pollution.
To install the dust handling system on board supply vessels, it will bring about the following benefits.
1. It could catch dust material and get rid of it from the vent air when the air is leaving the bulk tanks, before released to the atmosphere or the sea. Once the air passed through the dust-pack, it is almost pure air since the dust-pack took out most of the fine dust particles, thus no air-pollution.
2. By continuously returning the dust material trapped in the dust-pack back to the bulk tanks, no material loss can occur. The dust material can be recycled during loading when powder is transferred pneumatically from the shore base into the vessel’s bulk tanks.
3. The system of either the conventional vent system, or the dust handling system, can be chosen by a selection switch on the Mimic panel before loading.
4. The system can be operated by either manually or in full automatic operation from the PLC unit integrated in the Mimic panel, which requires no experience to operate the system.
5. To use the dust-pack, it is not necessary to provide a rubber hose from the vent connection on the main deck to the sea.
6. The system also has an alternative application for the time when open up bulk tanks for survey, or when a different material is to be carried in the tank on the next trip.
In this case, the dust-pack can be continually used to replace dusty air with fresh air in the tank while the tank is being manually cleaned without dispersion of dust inside the bulk tank. (See picture 1)
PICTURE1
The picture2 and picture3 shows the test unit for the dust handling system at factory.
picture 2
test facility at factory
picture 3
physical installation on board
We can show physical material transfer by using of cement material from a tank to a tank, vacuum cleaning system by mucking ejector and operation of the dust-pack which returns dust material to corresponding tank during pneumatic cement transferring between the tanks.
If ship’s owner or shipyard is interested in the dust handling system, we are pleased to invite any client to show above operations at our factory in China.
AUTOMATIC DUST COLLECTION SYSTEM -how it works-
During loading time, when powder is transferred pneumatically from the shore base into the vessel’s bulk tanks, material loss could occur.
Our newly developed dust handling system has dust collectors (Dust-Pack) installed in the bulk storage, and a transfer system to recycle pulverized material from the vent air leaving the bulk tanks before released to the atmosphere, or the sea.
Typically, particles of pulverized material carried in the vent air lie within 1 to 100 microns. The larger particles fall by gravity into a collecting box and the air then passes through the bag filter. Then dust pack can take out fine dust particles, up to about 20 microns completely from the air, leaving almost pure air to be finally vented.
The bag filter and associated equipment are mounted together on a common structure base.
Powder (Dust), trapped from the air stream by the fabric filter elements, is removed by hi-pressure cleaning air automatically.
This material also drops into the collecting box where a special pneumatic transfer unit is provided on the bottom.
The material dropped in the collecting box is then transferred to corresponding bulk tank being filled continuously by hi-pressure air from an independent air compressor.
Finally, all material from the vent line during loading are to be returned to corresponding bulk tank just filled and no material loss can occur without material contamination.
