Ventilation fixed screen device of circular cooler

Abstract

The invention discloses a ventilation fixed screen device of a circular cooler. The ventilation fixed screen device comprises a supporting seat, a screen beam, a cross beam and a screen cap which are located in a kiln hood; a ventilation pipe 2, a fan 1 and valves 3 are further arranged outside the kiln hood. The cross beam is naturally placed on the supporting seat; the two ends of the cross beam extend out of the kiln hood; one end of the cross beam is used for air inlet, is provided with the valves 3, is connected with the ventilation pipe 2, and is provided with air by the fan 1; the other end of the cross beam is used for air outlet, an air outlet is connected with a section of a hot air return pipe of the circular cooler so as to guide hot air back to a production system; an air inlet pipe end of the screen beam is provided with the valves 3, is connected with the ventilation pipe 2, and is provided with air by the fan 1; an air outlet of the screen beam is located in the kiln hood; and the hot air participates in fuel combustion by directly serving as primary air. The weld seams of the screen beam and the cross beam of the ventilation fixed screen device may crack due to the repeated severe temperature change between high temperature and normal temperature, the normal production is not affected because the screen beam and the cross beam are used for ventilation, and no energy consumption is increased because the hot air enters again for production. Protecting sheets can also be arranged to protect a granular refractory material filled around the supporting seat, so as to facilitate repair and maintenance.

Description

Technical field [0001] The invention belongs to the technical field of iron ore pellet engineering, and specifically relates to a ventilating fixed screen device for a ring cooler in an iron ore pellet engineering. Background technique [0002] The ring cooler is the main equipment in the grate rotary kiln pellet project, used to cool the hot iron ore pellets and recover the heat for secondary use. The fixed screen device is an important part of the ring cooler equipment, which is used to prevent large pellets from falling on the ring cooler trolley, causing the trolley to turn over and unsmoothly discharge. [0003] There are currently two types of fixed screen devices: solid fixed screens and water-passed fixed screens. Solid fixed screens are mainly used for small pellet projects with an annual output of about 600,000 tons, and water-passed fixed screens are mainly used for medium and large pellet projects. The iron ore pellets are hot minerals when they come out of the rotary ...

AI Technical Summary

Problems solved by technology

The water-passing screen beam is a permanent beam, which requires firm welding and no water leakage. The multiple severe temperature changes between the high temperature of the ring cooler and the normal temperature make the weld cracks easily, and water leakage accidents occur. Water is vaporized at high temperatures. Once a water leakage accident If it happens, it will have serious consequences, and production must be stopped for maintenance. At this time, the construction period for maintenance must be very long, which is not conducive to production; at the same time, due to water cooling, hot water cannot be recycled in the production system, and a large amount of heat will inevitably be exported to the production system, increasing production energy consumption

Images