摘要:
A calcining system wherein raw material is preheated by raw material preheating device for preheating the raw material by contact with a gas, calcined in a rotary kiln and cooled in a planetary cooler; a portion of cooling gas used for cooling the calcined material in the planetary cooler and heated thereby is led through an air extracting duct to the raw material preheating device and the rest of the heated cooling gas is introduced into the rotary kiln: and exhaust gases from the rotary kiln is led to the raw material preheating device. Such calcining system further includes a first damper mounted in a duct for discharging the exhaust gas from the raw material preheating device, a temperature sensor for sensing the temperature of calcined material discharged through an outlet of the planetary cooler, control device for controlling the degree of opening of the first damper when the temperature sensed by the temperature sensor rises to a high level, a second damper mounted in the air extracting duct, a gas sensor for sensing a gas component capable of indicating the condition of combustion in the rotary kiln, and control device for controlling the degree of opening of the second damper so as to bring the value of the gas component sensed by the gas sensor to a predetermined level. The flow rate of the cooling air can be controlled independently of the control of the flow rate of the air combustion, so that the temperature of the calcined material at the outlet of the planetary cooler can be kept at a predetermined level selected arbitrarily and the combustion in the rotary kiln and the calciner can be stabilized irrespective of changes in the conditions of operation.
摘要:
A heat exchanger including a separating chamber in the form of a prism having a substantially horizontal center axis and axially elongated. The separating chamber having a collecting chamber disposed beneath it has an inlet duct opening in the separating chamber and connected to one wall of the separating chamber, and an outlet duct opening in the separating chamber and connected to a wall of the separating chamber. The outlet duct may be connected to the wall to which the inlet duct is connected or to another wall parallel to the wall to which the inlet duct is connected. The inlet duct is positioned and oriented in such a manner that a stream of gas and particulate material is introduced therethrough into the separating chamber in a direction tangential to a spiral stream of gas and particulate material formed in the separating chamber, and the outlet duct is positioned and oriented in such a manner that a stream of gas is discharged therethrough from the separating chamber in a direction tangential to the spiral stream of gas and particulate material formed in the separating chamber. The collecting chamber is disposed away from the spiral stream of gas and particulate material formed in the separating chamber.
摘要:
Rotary drum type heat treatment apparatus having a rotary drum rotatable about a longitudinal axis. The drum has an outlet end and the apparatus includes a cooling section having a movable grate with one end disposed beneath the outlet end of the rotary drum for receiving material from the drum. The drum is provided at the outlet end with a plurality of circumferentially spaced distribution members, each of which has at least one side surface extending longitudinally outwardly beyond the outlet end and inclined with respect to a radial line of the drum for engagement with material being discharged through the outlet end to deflect the same.
摘要:
A method of premelting the raw materials for glass, which comprises burning a fuel by atomizing it within a combustion chamber while blowing combustion air into said combustion chamber so as to swirl along the inner wall thereof, feeding the raw materials for glass to said combustion chamber to effect partial premelting thereof, letting the thus premelted raw materials together with the combustion gas flow out from the lower part of the combustion chamber by way of a downwardly inclined duct, separating the premelted raw materials from the combustion gas, leading the premelted raw materials thus separated into a melting furnace, and utilizing the exhaust gas generated in the combustion chamber and/or the melting furnace effectively.
摘要:
A particulate material collecting apparatus including a cylindrical member defining therein a spiral flow chamber for forming a spiral flow of gas therein, an inlet duct and an outlet duct connected to the cylindrical member tangentially to the inner circumferential surface thereof, and a hollow inverted pyramidical member secured to the lower portion of the cylindrical member. A spiral flow guide plate having a convex surface curved radially outwardly of the cylindrical member is interposed between the cylindrical member and the inverted pyramidical member. The spiral flow guide plate is positioned so as to define two openings, one opening being located on the upstream side of the spiral flow of gas and the other opening being located on the downstream side of the spiral flow of gas. The spiral flow of gas is introduced from the spiral flow chamber through the upstream side opening into a material collecting space defined between an inner wall portion of the inverted pyramidical member and a collected material guide plate secured to the spiral flow guide plate to extend parallel to the inner wall portion, so that particulate material incorporated in the spiral flow of gas is separated by inertia from the gas and collected in the inverted pyramidical member.
摘要:
A method of melting the raw materials for preparing glass, which method comprises feeding powdery or granular raw materials for preparing glass successively into flames jetting out of burners along the sloped furnace bed of a melting furnace, letting said raw materials fall onto the furnace bed at a location away from the position of the inlet for raw materials while heating them with said flames as well as the combustion gas, melting the raw materials for glass that land on the furnace bed by heating with said flames, and pouring the thus melted raw materials into a glass tank furnace from the side of the melting furnace where the burners are provided.
摘要:
A powdery substance in suspension state is heated with the high-temperature combustion waste gas exhausted from a glass tank furnace, and the air for combustion is heated with the thus heated powder substance. When the powdery substance employed is a raw material for preparing glass, the raw materials for preparing glass and the air for combustion to be supplied to the glass tank furnace are both heated therewith thereby contributing to effective recovery of the heat of the combustion waste gas.
摘要:
A method is disclosed with provides stable growth of SiC single crystals, particularly 4H—SiC single crystals, with an effective crystal growth rate for a prolonged time even at a low temperature range of 2000° C. or lower. A raw material containing Si, Ti and Ni is charged into a crucible made of graphite and heat-melted to obtain a solvent. At the same time, C is dissolved out from the crucible into the solvent to obtain a melt. A SiC seed crystal substrate is then brought into contact with the melt such that SiC is supersaturated in the melt in the vicinity of the surface of the SiC seed crystal substrate, thereby allowing growth and production of an SiC single crystal on the SiC seed crystal substrate.
摘要:
A steel sheet for containers that has excellent film adhesion qualities, and has; a chemical conversion coating formed by immersing or subjecting to electrolytic treatment a steel sheet in a solution containing Zr ions, F ions, with adhesion amount of 0.1 to 100 mg/m2 for metal Zr and no more than 0.1 mg/m2 for F; and a hydroxyl acid treatment layer formed on the chemical conversion coating, the layer having a C adhesion amount of 0.05 to 50 mg/m2.
摘要:
Provided are an apparatus for continuous electrolytic treatment of a steel sheet that is suitable for producing a surface-treated steel sheet and a method for producing the surface-treated steel sheet using the apparatus for continuous electrolytic treatment of a steel sheet. The apparatus includes N pairs of tabular electrodes having a length L and being arranged to respectively face two surfaces of a steel sheet. Each electrode includes n sections arranged in the longitudinal direction of the electrode and disposed on the surface of the electrode facing the steel sheet surface. Each section is constituted by a conductive portion including an electrode portion having a length T1 and a nonconductive portion made by making an electrode portion having a length T2 nonconductive, where n×N≧10, 0.96≧T2/(T1+T2)≧0.05, and 0.9≧T1/L≧0.1.