propellers without a central shaft consist of propeller blades attached to a ring which is part of a circle-shaped electric motor. this design is known as a rim-driven thruster and has been used by some small, self-guided robotic ships. it has been referenced by the ambiguous phrase 'screwless propulsion' in the united kingdom. aircraft propellers.
a dragon kiln chinese: 龍窯; pinyin: lóng yáo; wade–giles: lung-yao or 'climbing kiln', is a traditional chinese form of kiln, used for chinese ceramics, especially in southern china. it is long and thin, and relies on having a fairly steep slope, typically between 10 and 16 , 1 up which the kiln runs.
kobe steel's midrex shaft furnace process operating at higher temperature using hydrocarbon natural gas in place of solid coal and producing hot iron briquettes which were cleaner. its disadvantage was fuel losses due to incomplete combustion of hydrocarbons.
the fushun process is classified as an internal combustion technology but also includes external gas heating. it uses a vertical cylindrical type shaft retort, with outside steel plate lined with inner fire bricks. the retort has height over 10 metres 33 ft and its inner diameter is about 3 metres 9.8 ft . seven trust oil shale particles with the .
a muffle furnace or muffle oven sometimes retort furnace in historical usage is a furnace in which the subject material is isolated from the fuel and all of the products of combustion, including gases and flying ash. after the development of high-temperature heating elements and widespread electrification in developed countries, new muffle furnaces quickly moved to electric designs.
in addition to a full range of refined products heavy fuel oil to liquified petroleum gas , the plant also incorporated a 110,000 ton per year benzene production, and a 250,000 ton electrode grade petroleum coke plant.
the shaft kiln had a brief period of use before it was eclipsed by the rotary kiln, but it had a limited renaissance from 1970 onward in china and elsewhere, when it was used for small-scale, low-tech plants in rural areas away from transport routes.
for a typical materials science experiment, a sample of the material under study is loaded into the top of the drop tube, which is filled with inert gas or evacuated to create a low-pressure environment. following any desired preprocessing e.g. induction heating to melt a metal alloy , the sample is released to fall to the bottom of the tube.during its flight or upon impact the sample can be .
most softwood kilns are track types in which the timber us: 'lumber' is loaded on kiln/track cars for loading the kiln. modern high-temperature, high-air-velocity conventional kilns can typically dry 1-inch-thick 25 mm green wood in 10 hours down to a moisture content of 18%.
jump to navigation jump to search. petrosix is the world’s largest surface oil shale pyrolysis retort with an 11 metres 36 ft diameter vertical shaft kiln, operational since 1992. it is located in são mateus do sul, brazil, and it is owned and operated by the brazil energy company petrobras.
the first were simple shaft kilns, similar in construction to blast furnaces. these are counter-current shaft kilns. modern variants include regenerative and annular kilns. output is usually in the range 100–500 tonnes per day. counter-current shaft kilns. the fuel is injected part-way up the shaft, producing maximum temperature at this point.
the stuart oil shale project is an oil shale development project in yarwun near gladstone, queensland, australia.it is australia's first major attempt since the 1950s to restart commercial use of oil shale. the project was originally developed by australian companies southern pacific petroleum nl and central pacific minerals nl spp/cpm and developed now by queensland energy resources.
schottel is a manufacturer of propulsion and steering systems for ships and offshore applications. the company founder josef becker invented the rudderpropeller, a z-drive, in 1950.today the company develops and manufactures azimuth propulsion, maneuvering and steering systems.in 2014 the subsidiary schottel hydro was founded to bundle up the company activities in the hydrokinetic energy segment.
the paraho direct process evolved from gas combustion retort technology and is classified as an internal combustion method. accordingly, the paraho direct retort is a vertical shaft retort similar to the kiviter and fushun retorts, used correspondingly in estonia and china.