Blast belt type roasting machine and method for roasting pellets

Abstract

The invention discloses a blast belt type roasting machine and a method for roasting pellets. On an upper-layer rail, a bedding material chute, a roll type screen distributor, an edge paving materialchute and a waste gas exhausting and smoke collecting furnace cover are sequentially arranged from a machine head, the machine also comprises a waste heat power generation boiler, a waste gas exhausting and smoke collecting cover located above the boiler, a furnace cover (a boiler furnace adopting a heat preservation wall), an air bellow positioned below the upper-layer rail, and an air blower, and a trolley underframe is separated into a plurality of gaps of 8-10 cm by steel plates. The roasting machine is used for firing the pellets internally provided with pulverized coal and magnetite concentrate powder, through blowing-in ignition and control over air volume and material distribution amount, the continuous and stable production can be realized without continuous ignition using an ignitor, the effect is the optimal when the height of a material layer is 60-120 cm, meanwhile, the quality uniformity of the pellet finished product is good, the waste heat is directly used for power generation, heat-resistant parts are hardly consumed except baffles, air blowing is adopted for both roasting and cooling, and thus the electric energy utilization rate is high.

Description

Technical field [0001] The invention belongs to the equipment technology of a belt roaster in the metallurgical industry, and specifically relates to a blast belt roaster and a method for roasting pellets. Background technique [0002] The existing belt roasters in our country all use blast and suction to dry and preheat the green pellets, the roasting adopts suction roasting, and the cooling adopts blast cooling. Although the existing belt roaster technology is very mature, it also has shortcomings, such as the large amount of high-temperature-resistant special alloy steel, the uneven quality of the finished pellets, the thin layer of roasted green pellets (200~400mm), The equipment has a high degree of automation and a complex structure. Once a problem occurs, it is inconvenient to maintain, and the total equipment investment is huge. Summary of the invention [0003] Aiming at the problems of the belt roasting machine with a thin layer of roasted green balls (the thickness of ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of thin roasting green pellet layer (green pellet thickness 200~400mm), large amount of high temperature resistant special alloy steel and huge total equipment investment in the belt roaster, the present invention provides a magnetite concentrate powder pellet suitable for firing, No igniter is needed for continuous ignition. The pellet fuel is equipped with high-quality anthracite coal powder. The roasting zone and the cooling zone are equipped with a custom-made waste heat power generation boiler. The bottom of the waste heat power generation boiler and the trolley are fully sealed. Blast belt roaster for continuous production

Images