Abstract:
This invention concerns a method for the heating of a medium in a compartment 1 in which pellets 2 are arranged to be oxidised and sintered with the aid of the hot medium. The method comprises the introduction of a first medium 3 into the compartment 1 through an inlet 4 and the heating of the first medium 3 when it is present in the inlet 4. The heating takes place through the use of a combustion arrangement 5, or a part of such an arrangement, that is arranged in the inlet 4 and that comprises fuel. The heating, the use of the combustion arrangement 5, comprises in turn the ignition of the fuel, combustion of the fuel whereby combustion heat is developed, and the transfer of the combustion heat to the first medium 3 that is present at the combustion arrangement 5 in the inlet 4. The combustion arrangement 5, or a part of it, is arranged in a region A in the inlet 4, which in turn is arranged outside of the direct passage of the first medium in and through the inlet 4, such that the ignition of the fuel, the combustion of the fuel and the transfer of combustion heat to the first medium 3 take place in this region A, followed by onwards transport of the heated first medium 3 from the region A into the compartment 1 through the inlet 4. The invention concerns also an arrangement 7 and a pelletising plant 10.
Abstract:
This invention relates to the thermal treatment of lump or agglomerated material in a firing machine (1 ) with a travelling grate (2) on which the material is conveyed through the firing machine (1 ), a firing chamber (4) for generating the temperatures required for the thermal treatment, a cooling zone (5) in which cooling gases are passed through the thermally treated material, and a recuperation tube (7) through which the heated cooling gases are recirculated to the firing chamber (4). In the ceiling (8) of the firing chamber (4) a plurality of openings (9) is provided, through which the heated cooling gases from the recuperation tube (7) can enter into the firing chamber (4).
Abstract:
The present invention relates to a vertical, autothermal furnace characterised in that it comprises a furnace that tapers with the lower part wider than the upper part and having a spherical, elliptical or polygonal cross section, said furnace being replenished with carbon-containing pellets; a pellet filler opening; a discharger; and an air regulator. The present invention further relates to an autothermal method of manufacturing fired material comprising the steps of filling said vertical autothermal furnace with carbon-containing pellets and preheating, and then continuously loading carbon-containing pellets into said preheated pellet-loaded furnace, and continuously discharging said autothermally fired material produced by the autothermal firing of said carbon-containing pellets from the lower part thereof. The method of manufacturing fired material using said furnace has the economic advantage of enabling the autothermal firing of pellets using only the heat generated during firing without additional heating.
Abstract:
본 발명은 횡단면이 원형, 타원형 또는 다각형으로 상부보다 하부가 넓은 테이퍼 형상이며 탄소를 함유하는 펠렛으로 충전된 소성로, 펠렛 투입부, 배출부, 공기 조절부를 포함하여 이루어지는 것을 특징으로 하는 수직형 자열 소성로에 관한 것이다. 그리고 본 발명은 상기 수직형 자열 소성로에 탄소를 함유하는 펠렛을 충전 시켜 예열한 후 상기 예열된 펠렛을 충전시킨 소성로의 내부에 탄소를 함유하는 펠렛을 연속적으로 투입하고, 상기 탄소를 함유하는 펠렛이 자열 소성되어 생성된 자열 소성체가 하부로 연속적으로 배출하는 단계를 포함하는 자열 소성체 제조방법에 관한 것이다. 상기 소성로를 이용하여 소성체를 제조하는 방법은 추가적인 가열 없이 소성 시 생성되는 열만으로 펠렛을 자열 소성 할 수 있는 점에서 경제적인 이점이 있다.
Abstract:
The invention relates to nonferrous and ferrous metallurgy, in particular to processes for roasting an agglomerated charging material during agglomerate production for subsequent melting. The inventive methods for agglomerating a charging material under pressure with gaseous reagent descending and ascending currents, wherein the charging material is loaded and the agglomerate is unloaded at the atmospheric pressure, consists, while staring operation, in igniting a charging material fuel in a first pot by means of an external heat source, in carrying or a partially sintering in a normal air-passing operation mode and in carrying out the subsequent sintering and ignition of the charging material fuel in a pot-to-pot manner associated with a pressure air passage. Methods for enhancing the process and increasing the agglomerate quality are used during sintering. Multipurpose agglomeration units for carrying out the methods in any known sintering modes under pressure are also disclosed. Said invention can be used, for example in the chemical and other industries, where the processes for material roasting and agglomeration in a filtering layer are used.