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MULTIPORT DETAILS
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Environmental protection |
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Short delivery time - standardisation |
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Maintenance and protection |
The Multiports, for example, are equipped with filters which capture the dust from the products being handled. One special type of filter cleaning system has shown to be the most adequate is the reverse flow generated by a blower. It uses the same air of the filter (same temperature and density), thus avoiding water condensation and blockage of the filter bags. Also, filter bags can be cleande by air blasts generated by an air compressor with an air dryer needed to avoid the mentioned water condensation. Today, the sound insulation in this equipment is standard and its use in ports close to residential areas is becoming more and more acceptable.
The Multiport unloader has a short delivery time because all swivelling parts are standardised, even the gantry if a rubber wheel type is required. With the use of rails, the design and necessary engineering takes some more time. A rail unloader will normally require a twelve-month delivery time and, if in stock, rubber tyred with generating set unloader will be available in the same range of time.
Multiport unloaders offer electrical and mechanical protections such as:
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Electrical panel with PLC and troubleshooting lamps |
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Limit switches |
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Over and underload protection |
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Protection of rotating parts |
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Easy access to checking points |
The possibility of lowering the boom to the ground offers a considerable advantage because inspection and substitution of parts - wearing plates of the elbow, winches and cable pulleys etc. - are made on the ground, making careful inspection very easy, and any dangerous work high above the ground is eliminated.
Advantages:
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the efficiency of thoroughly designed turbo-blowers is higher than that of roots-blowers; |
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on account of the characteristic curve, the velocity of the conveying air can be varied; |
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in the partial-load range, the velocity of the conveying air remains rather constant, i.e. wear on the conveyor pipe and the conveying material is lower; |
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the conveying air flow is continuous. The high-frequency noises can be dampened with little expenditure; |
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the running wheel is resistant to foreign matter, i.e. complicated filter equipment can be avoided; |
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the sensitivity to higher air temperature is low. |
Disadvantages:
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a turbo-blower starts more slowly than a roots-blower; |
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the energy demand in the partial-load range is higher than that of the roots-blower. |
Advantages:
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a roots-blower quickly attains the full number of revolutions; |
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the power demand in the partial-load range is lower. |
Disadvantages:
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in the range of partial load, the conveying speed is higher, i.e. wear on the conveyor pipe and breakage of the conveying material will be greater; |
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a conveying speed once chosen can only be altered with considerable expenditure; |
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due to the low-frequency noises (pulsating conveying air flow), expensive noise dampening equipment will be necessary; |
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in order not to exceed the operating pressures, a control device must be installed; |
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on account of the narrow piston clearance, the roots-blower is sensitive to to foreign matter, i.e., filter cleaning of the conveying air is required; |
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after a longer period of use, the piston clearance becomes larger and leads to capacity losses. |
The advantageous use of turbo-blowers in pneumatic ship unloading plants can be seen from this list of advantages and disadvantages; therefore, NEUERO has always chosen this way and used the single stage radial high-capacity blower as major components of its conveying installations.
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Figure
5