Back to coal for power. [Fuel for ships]

Journal Article · Tue Jul 01 04:00:00 EDT 1980 · Mar. Eng./Log; (United States)

OSTI ID:6777606

Leading Austrailian shipments have drawn up a statement of requirements for two coal-fired 75,000 dwt bulkers. The two ships will carry bauxite from deposits at Weipa in north Queensland. The Japanese Bureau of Ships' study indicates a cost savings in using pulverized rather than lump coal; however, it appears the first coal-fired ships of the new generation will apt for lung coal using a mechanical stoker spreader system. The Macauber concept, called the Denseveyor system, is to push materials pneumatically in non-fluidized condition and at low velocities. In the automatically controlled Denseveyor system, coal is gravity-fed into a vibrating chute through a patented dome valve into the Denseveyor vessel. When the vessel is full, the valve closes and seals the vessel to prevent the escape of entrained air. Air is introduced, and the coal is pushed as a cohesive slug to boiler feed hoppers. Fuel-level probes in these hoppers signal the dome valve when fuel is needed. The operating cycle is continuous. In Macawber's automatic ash-handling system, ash and clinker are allowed to accumulate in a storage hopper until a pre-set level probe is activated. The probe signals an ash-breaker in the lower part of the hopper. The probe also signals the dome valve toopen. The ash-breaker passes ash and broken clinker through the dome valve into a conveying chamber. When this is full, the dome valve closes, air enters the chamber and the crushed clinker ash is pushed to other storage hoppers. The new coal-fired ships will have to reflect present-day thinking. Growing interest in coal-firing has attracted the attention of the leading ship classification societies. Costs involved are included. (DP)

• OSTI ID: 6777606
• Journal Information: Mar. Eng./Log; (United States), Journal Name: Mar. Eng./Log; (United States) Vol. 85:8; ISSN MENLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320204 -- Energy Conservation
Consumption
& Utilization-- Transportation-- Sea & Water
AUSTRALASIA
AUSTRALIA
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
COST
ENERGY SOURCES
FOSSIL FUELS
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FUELS
MATERIALS
OXIDATION
POWER
SHIPS
STOKERS
THERMOCHEMICAL PROCESSES