摘要:
A description is given of an inclined feed shaft «(1) for feeding particulate material to a mill (2). The feed shaft (1) is peculiar in that it is configured for rotation about its longitudinal axis. It is hereby obtained that any incipient formation of coatings on the wall of the shaft will continuously be cleaned off and dislodged from the wall by the larger descending material particles in the feed material so that the feed shaft will be of a self-cleaning type. This is due to the fact that during the rotation of the shaft (1) the entire circumference of the shaft (1) will intermittently be located at the bottom of the cross-sectional profile of the shaft (1), and thereby be cleaned off by the descending material. As a result, coatings continuously being formed during the rotation of the shaft on those parts of the shaft wall not located at the bottom will continuously be cleaned off when these parts pass the bottom of the cross-sectional profile of the shaft (1).
摘要:
Described is a rolling bearing (1) for a rocker arm, said rolling bearing comprising an at least partly circular outer part (2), an at least partly circular inner part (3) and a number of rolling elements (5) which are fitted between the outer part (2) and the inner part (3). The rolling bearing is peculiar in that at least one of the rolling elements (5) comprises two opposite, curved side faces (6, 7), which viewed in at least one cross-sectional constitutes arc lengths of the same imaginary circle (10), and which constitutes contact faces for the outer and the inner circular part (2, 3) respectively, and at least one side surface (8, 9), which lies within the mentioned imaginary circle (10). It is hereby obtained that the number of rolling elements in the bearing can be increased, thereby reducing the load on each single rolling element subject to the same total load rate, thereby increasing the total load bearing capacity of the bearing. This is due to the fact that at least a part of the roller face of the traditional circular rollers which do not get into contact with the outer or inner part of the bearing through small reciprocating angular rotations is omitted thereby significantly reducing the space taken up by each of the rolling elements in the circumferential direction of the bearing.
摘要:
Described is an apparatus (5) as well as a method for cooling kiln exhaust gases in a kiln bypass (7), which apparatus comprises a mixing chamber (9) for extracting and cooling a portion of the kiln exhaust gases from a kiln system (1, 3), said mixing chamber (9) comprising a tubular housing being provided at one end with an exhaust gas inlet (11) for kiln exhaust gases and provided at its other end with an outlet (13) for cooled exhaust gases, said mixing chamber (9) further comprising a tangential inlet (15) for cooling gases, where the apparatus also comprises a first fan (17) for supplying cooling gases to the mixing chamber (9) and a second fan (19) for drawing the kiln exhaust gases through the kiln bypass (7). The apparatus (5) and the method is peculiar in comprising means (31, 33) for measuring, respectively, the mass flow mA and the flow velocity vA of the cooling gases which are introduced to the mixing chamber (9), and the mass flow mB and the flow velocity vB of the cooled exhaust gases being discharged from the mixing chamber (9), a calculating unit (35) to determine on the basis of the measured values mA, vA, mB and vB the actual mass flow mC and the flow velocity vC for the kiln exhaust gases being drawn through the kiln bypass (7) and to compare the actual mass flow mC with a predetermined value for kiln exhaust gases targeted for being drawn through the kiln bypass (7), a calculating unit (35) to determine on the basis of the values mA, vA, mC and vC the actual swirl number S of the gases in the mixing chamber (9) and to compare this with a predetermined, desired value for the swirl number of the gases in the mixing chamber (9), and means (37, 39, 41) for regulating respectively the fan (17) for feeding cooling gases to the mixing chamber (9), the fan (19) for drawing the kiln exhaust gases through the kiln bypass (
摘要:
A method and apparatus is disclosed for separating a slurry into liquids and solids in a pressure filter apparatus and for forming a substantially dry and often loosely packet filter solids cake wherein a high temperature and high pressure steam is introduced into an initially formed filter cake in the pressurized filter apparatus to force the steam into the interstices of the formed filter cake and then pressure within the filter apparatus is reduced to permit the steam to flash and to expand within the interstices to absorb any remaining fluids within the formed filter cake and to cause the filter cake to become substantially dry and loosely packed. The filtered solids cake is then discharged from the filter apparatus.
摘要:
A roller mill (1) for grinding particulate material such as cement raw materials, cement clinker and similar materials, said roller mill (1) comprising a mill housing (2) enclosing a grinding (3) table and a set of rollers rotatable about a vertical shaft (4), said set of rollers being configured for interactive operation with the grinding table (3) and comprising a number of rollers (5) each rotating about a roller shaft (6) which is connected to the vertical shaft (4) via a hinged connection (7) with a centre of rotation (8) which allows a free circular movement of the roller (5) in upward and downward direction in a plane comprising the centreline (9) of the roller shaft (6), said centre of rotation (8) of the hinged connection (7) in a vertical plane is located under the centreline (9) of the roller shaft (6). The roller mill is peculiar in that the grinding table (3) is rotatable about the vertical shaft (4) and in that the roller mill (1) comprises means (10,11) for introducing gases into the mill housing (2) and means (12) allowing for continuously diverting ground material suspended in gases out of the mill housing (2). It is hereby obtained that the grinding process is performed continuously as the material fed to the grinding table is transported across the grinding table, by means of the centrifugal forces to which the material is subjected due to the rotation of the grinding table, to the rollers where it is ground and subsequently suspended in the gas introduced in the mill housing, whereafter the ground material in suspended form is diverted through an outlet connected to the mill housing.
摘要:
A slurry filtration system and apparatus with peripheral elements for conditioning a slurry prior to entry into a pressure filter (32) and the control of fluid and liquid introductions into the filter (32) to produce a desired filter cake or filtrate. The system includes a controller (16) for controlling the operation of the peripheral treatment for the introduction of coagulants, flocculants and polymers to treat or condition a slurry introduced into the filter (32) and the control of additional peripheral equipment for treatment of the slurry with liquid clearing or cake forming gas, steam, or drying or conditioning gas within the filter chamber (40) for the production of both filtrate and filter cake from the filter (32) to a form desired.
摘要:
Described is a roller mill (1) for grinding particulate material, such as cement raw materials, cement clinker and similar materials, said roller mill comprising a substantially horizontal grinding table (3), at least one therewith interactively operating roller (4) which is configured for rotation about a roller shaft (6) through the use of a bearing (7) for the roller, and a closed circulation system for lubricant for lubricating the bearing (7) for the roller, said circulation system comprising a reservoir (9), ducts (10) for feeding of lubricant to the bearing (7) for the roller and ducts (11) for recirculating the lubricant from the bearing (7) for the roller. The roller mill is peculiar in that it comprises a pump means (20) which is driven by the rotation of the roller (4), and comprising a first part (21) which is mounted on the roller shaft (6) and a second part (22) which is mounted on the roller (4) and rotating therewith. Hereby is obtained an autogenously regulated pressure pump which during the operation of the mill delivers a significant pressure contribution for recirculating the lubricant to the reservoir, and having a capacity which is proportional to the rotational speed of the roller and hence the lubricant requirement.
摘要:
A description is given of a burner for introducing solid, liquid or gaseous fuel to a burning zone of a kiln, such as a rotary kiln for manufacturing cement clinker or the like, said burner comprising a number of substantially concentric ducts (1, 2, 3), being parallel to the main axis B3 of the burner, for conveying fuel and primary air to nozzle openings, as well as a number of additional ducts (4, 6, 7, 8) for conveying solid, fluid or gaseous fuel to separate nozzle openings, said additional ducts being located in the central part (10) of the burner. The burner is characterized in that it comprises means (4a, 5) for changing the flow direction of the fuel which is introduced via at least one of the additional ducts in the central part (10) of the burner, relative to the main axis B3 of the burner, at least in an ascending direction. This will allow the individual fuel particles to travel in a curved, approximately ballistic path, thereby extending the time they can be maintained in the flame. Another advantage of this configuration of the burner is that the large particles will attain the highest, and hence the longest, path, since the path of the smaller particles will to a greater extent than is the case for the large ones be deflected by the primary air which is injected via the outer annular primary air nozzle which is parallel to the main axis of the burner. Hence it will be possible to achieve a more uniform combustion of all particles, regardless of their size. It will be possible to change the path of the particles by altering the velocity or direction of injection.
摘要:
A description is given of a temperature-stable cast-iron alloy having high wear resistance at temperatures between 500 and 900° C. The alloy is characterized in that it has the following composition expressed in weight percentages: chromium: 15.0-20.0 %, carbon: 1.0-2.0 %, manganese: 1.5-2.0 %, silicon: 0.8-1.2 %, nickel: 8.0-10.0 %, molybdenum: 0.8-1.2 % balance iron and unavoidable metallic and non-metallic contaminants where the non-metallic contaminants comprise nitrogen, oxygen, phosphorous and sulphur. Hereby is obtained a cast-iron alloy which has a higher wear resistance and a reduced tendency to form the undesirable sigma phase when heated to temperatures between 500 and 900 °C as compared to the known allows.
摘要:
Described is a method as well as a plant for manufacturing cement clinker, by which method cement raw materials are preheated in a preheater (1), calcined in suspension with hot gases in a calciner (2, 20), separated from the gases in a cyclone (2a), burned into cement clinker in a kiln (3) and subsequently cooled in a cooler (4) by which method a quantity of calcined raw material with a high content of CaO is extracted via a calcination stage (2, 20) by means of an additional separation cyclone (5a). The method and the plant are peculiar in that the gases which are diverted from the additional separation cyclone (5a) are cooled to a temperature of maximum 850 °C by means of cement raw materials which are introduced into the gas stream. It is hereby obtained that the quantity of material which is extracted by means of the additional cyclone can be adjusted by means of known means in a more reliable manner than has hitherto been possible, while also significantly reducing the risk of alkali-induced clogging. This is due to the fact that the lower temperature allows utilization of generally known control means and the fact that the alkali in the gases will condense and settle on particles in the gases at temperatures which are lower than 850 °C.