摘要:
The invention relates to a process for the bleaching of an aqueous lignocellulosic pulp under acidic conditions in the bleaching plant of a pulp mill. The bleached pulp is used for the production of paper or pulp. The selectivity of the bleaching agent towards primary reactions with lignin is enhanced by the use of a carbon dioxide providing medium in the pulp.
摘要:
A method of laser-beam cutting stainless steel, other high-alloy steel materials, and aluminium or aluminium alloys while using nitrogen as a cutting gas. According to the method, there is used nitrogen which contains oxygen in a small amount corresponding to 0.1-10 volume-%. The oxygen content is preferably 0.5-5.0 volume-%. The invention also relates to a gas composition for use when carrying out the method.
摘要:
Method for combusting a solid phase fuel, where the fuel is caused, by the help of a non-pneumatic feeding means (11), to be fed to an inlet opening (11a) in a burner device (10), where the burner device (10) is caused to comprise a first inlet (13a) for the oxidant through which an oxidant is caused to flow via a first supply conduit (13). The invention is characterised in that the first inlet (13a) for oxidant is caused to be arranged in the form of an opening surrounding the inlet opening (11a), in that the oxidant is caused to flow out through the opening (13a) with a velocity of at least 100 m/s, through a burner pipe (16) and out through a burner orifice (17) to a combustion space (18), so that the oxidant by ejector action causes the fuel to be conveyed through the burner pipe (16) and out through the burner orifice (17).
摘要:
Method for homogenizing the heat distribution as well as decreasing the amount of NO x in the combustion products when operating an industrial furnace (1) with at least one conventional burner (2a, 2b, 2c, 2d) using air as oxidant. An additional oxidant comprising at least 50% oxygen gas is caused to stream into the furnace (1) through a lance (3a, 3b, 3c, 3d). The total amount of oxygen supplied is balanced against the amount of fuel being supplied through the air burner (2a, 2b, 2c, 2d). The invention is characterised in firstly, the combination of that at least 40% of the supplied oxygen is supplied through the additional oxidant, that the lance (3a, 3b, 3c, 3d) is arranged at a distance from the air burner (2a, 2b, 2c, 2d) of at least 0.3 meters, and that the additional oxidant streams into the furnace (1) through the lance (3a, 3b, 3c, 3d) with at least sonic velocity, and secondly that the additional oxidant is supplied only when the air burner (2a, 2b, 2c, 2d) is operated at a certain lowest power or at a higher power.
摘要:
The invention is characterized in that each one of the side edges (4a, 4b) of the door (3) is arranged to run inside and along a respective tube (5a, 5b) that has a longitudinal slit (6a, 6b) and extends vertically, in that each tube is fixed in relation to the furnace, in that the tubes (5a, 5b) are designed to spring back towards a respective position in which the slit (6a, 6b) is closed, and arranged to enclose the side edge (4a, 4b) of the door (3) along essentially the whole length of the side edge (4a, 4b) when the door (3) is in its closed position, and in that a liquid coolant is arranged to stream through the tubes (5a, 5b) and essentially fillup the whole space defined by the combination of the inner surfaces of each tube (5a, 5b) and the outer surfaces of the respective side part of the door (3).
摘要:
Burner device (2) for an industrial furnace (1) comprising a channel (3) for fuel, a channel (4) for a first oxidant, an outlet (9) for flue gases, a control device (10) and a heat buffer (7), where the first oxidant and the flue gases alternatingly are led through the heat buffer (7). The invention is characterised in that a separate lancing device (6) is arranged to supply a second oxidant to the burner device (2).