Brandresistent hydraulik för anläggningar

Hydraulics is an efficient and a generally good way of transferring energy, but the technology does not come without its drawbacks. One in particular is when it is used in hot environments. Oil fires are devastating and hard to extinguish, the catastrophe in Bois du Cazier 1956 tells us this with its 262 casualties of which most were coal mining workers. The tragedy started with a simple short circuit.In Outotecs plants hydraulics is commonly used. With background in Outotecs customer demands this thesis investigates fire-resistant, non-mineral oil based, hydraulic fluids and implements them in an existent plant, Outotecs kaldo furnace TBRC. The components in the hydraulic system have been modeled using Solidworks and assembled as a hydraulic unit, Power Pack, that has been placed within a 20 feet shipping container. A Life Cycle Cost-analysis has been made for the furnace with the hydraulics and lance systems.A hydraulic fluid analysis has been made using industrial standards, hydraulic- and tribologic theory and contact with leading hydraulic suppliers. The modeling of the system has been made using Solidworks with basis in performance demands, service and reliability, study visits and mechanical hydraulic theory. The LCC-analysis is based on Outotec experience and economic reports delivered by one of Outotecs operational organisations which contains operational characteristics from a similar TBRC in service.The primary choice of fire resistant hydraulic fluid is the polyol ester which is the result of a fatyt acid and an alcohol. The fluid can be used in the current system without any modifications. The alternative is a water and glycol based hydraulic fluid, if this liquid is used the pumps and motors have to be downrated in the current hydraulic system in the TBRC.The component layout is evolved around the tank. On it the filters are placed, beside it the pumps. Accessibility and service operation controls the placement of the other components. For example the accumulator rack also acts as a valve support.Validerat; 20150824 (global_studentproject_submitter