Elaboration of design and calculation of energy and power parameters of a facility for lime unloading from a shaft furnace

Abstract

Operation of shaft furnaces for lime burning in the required technological mode to a great extent is effected by reliability and technical abilities of their finished product unloading systems. A system proposed for unloading a shaft furnace for lime burning, enabling to deliver in a stable mode crashed material providing it has large sintered pieces. The system includes a stationary round table, located symmetrically relating the vertical axis of the furnace body under the conical collector exit opening. The table has four semi-round scraper knives connected by hinges with four pushing rods, acting by drive hydraulic cylinders. Alternately one pair of cylinders is working for pushing, the other – for pulling the rods. It results in the scraper knives making turn motions relatively the table, rolling along its edge and pushing off it bulk material by their back round part. To design a pilot sample of the proposed unloading system for shaft burning furnace, a methodology was elaborated to calculate its power parameters. The methodology takes into account the technological loads, arising at the realization of the process of measured delivery of the burnt lime from the furnace. The proposed methodology enables to determine the required values of pressure and consumption of oil station working liquid. The oil station provide operation of the cinematically interconnected four hydraulic cylinders, which make the two pair of scraper knives moving along a set trajectory on the table surface of the furnace to deliver from it the bulk material. The rightness of the technical solutions applied to the design of the elaborated shaft furnace unloading system as well as the correctness of the proposed theoretical dependences used for calculation of its energy and power parameters, were confirmed by the experiments. The experiments were carried out at an operating physical model, manufactured in the scale 1:10 to the natural facility.