Abstract: The present invention concerns a convective system for a dryer installation for a passing web, more particularly paper. The convective system 7 is an assembly of an exterior casing 13 for suction of combustion products with opening 14 towards the web, with a first 15 and second 16 suction ducts sucking the combustion products into the convective system 7. The combustion products coming from the first suction duct 15 are guided through the exterior casing 13 to a mixing and blowing device 17. Cold air 18 is mixed in this mixing and blowing device 17 with the combustion products 19, resulting in a gas mixture with lower temperature 20. The convective system 7 also has an internal casing 21 inside the external casing 13. This internal casing 21 has at least one opening towards the web 22 and has also openings 34 allowing gas flow from the mixing device 17 to the internal casing 21 of said gas mixture 20. Under the internal casing 21, there is also a blowing duct 23.

Abstract: A method for maintaining a uniform stable operation of a blast furnace susceptible to erratic behavior because of large disturbances introduced into the furnace is described. The method includes:(a) determining a high temperature heat parameter (HTH) over a predetermined period of time,(b) determining a CEEP parameter over a predetermined period of time,(c) comparing the differences between the HTH and the CEEP parameters and their respective averages during selected time periods of operation, and(d) changing the temperature and/or moisture content of the hot blast air dependent upon the values in step (c).

Abstract: Process for monitoring a pelletizing plant for fine-grained ores, in which the humidity content of the green pellets is adjusted by adding water with consideration of the humidity content of the fine ores and humidified ores, together with optional additives, are hardened on a travelling grate by a heat treatment, characterized in that the green pellets are charged onto the travelling grate and the permeability and optionally also the humidity of the pellet layer is measured, in that the measured values for the permeability and the measured values or the preselected value for the humdity of the green pellets are supplied to a process calculator for monitoring the process on the basis of parameters, such as the process gas temperature, the process gas pressure, the travelling speed of the travelling grate and the amount of charge supplied, preadjusted or defined at the begin of the process, and in that the process is monitored by comparing the value for the position of the sintering point on the travelling gra

Abstract: This invention relates to an improvement of the process for producing sintered iron ore with a Dwight-Lloyd machine, and it provides a process for producing sintered ore with high reducibility by sintering a raw material mix of a moisture content between 4.5 and 8.0% on the pallets of said machine, which comprises drying the surface layer of said mix on the pallets to discharge 3 to 25%, preferably 5 to 20%, of the moisture content of the mix from the sintering system, and thereafter igniting the surface layer of the mix to sinter the same with air or gas sucked downward.