Slag Pot Design x5h1n
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SLAG POT DESIGN
Page 1 of 2
January 9th 2014
GENERAL
MATERIALS
DESIGN
HANDLING
MAINTENANCE AND REPAIR
Slag Pots Design The shape of a slag pot depends primarily on the operational conditions it has to withstand. Thus, the following design criteria must be taken into consideration z z z z z z
Type of furnace that the slag pot will service, Quantity and type of slag generated, Method of handling and dumping the pot, Heat impact during operation, Dimensional restrictions, Pot maintenance procedures
A slag pot essentially consists of the real container part as well as of the parts necessary for the handling of the pot. Parts that are needed to handle a slag pot are: * at least 2 trunnions to pick it up and move it whereever this should be necessary, * the base to put it down onto the ground * a mechanism to handle the pot by a slag pot carrier, that is, using this mechanism, the pot can be tippped to pour molten slag into slag pits for processing, * at least one tilting lug either to tip the filled pot by a crane or to turn the empty pot in an appropriate position for cooling down or for repair. *
A slag pot with all parts necessary for its handling must be designed to meet the following essentials: z
The thermal expansion due to heat load during operation should be uniform all over the circumference of the slag pot body and should be hindered as few as possible by material accumulations and ribs resulting in section areas of wall thickness transition
http://specialproduct.net/design.shtml
09-Jan-14
SLAG POT DESIGN
z
Page 2 of 2
Likewise an uniform contraction should be aimed at by a steered cooling after dumping.
Thus, there are rules of thumb in developping slag pot designs: * The slag pot should be round. * The bottom of the pot should not be in direct with the ground, but some ground clearance should be forseen. * As few ribs as possible should be placed on the outside of the slag pot. *
All these criteria aim at as good a stability or stiffness as possible to prevent excessive premature deformation and secure the best life history of the slag pot. Details on how to design slag pot trunnions may be found here.
Section Modulus A significant measure of stiffness is section modulus, which is stiffness from shape or geometry. Unlike modulus of elasticity, it has nothing to do with the material. Actually section modulus is an aspect of moment of inertia which is a function of a shape's cross-sectional area in combination with its height. Stiffness from geometry of section modulus is a very powerful engineering tool. The knowledge of section modulus enables the engineer to create metal shapes that are much stiffer than the material itself could ever be. The most significant observation that can be made about stiffness from geometry is that there is no other method besides metal casting that can offer so much geometry in the design and manufacture of component shapes. Because of this, parts to handle a slag pot such as the tilting lugs, are rather cast-on than welded in place. Another significant observation is that design stress in a structural part is directly related to section modulus. In fact, it is a direct, inverse relationship in which increasing section modulus decreases stress. We now see an important synergism between modulus of elasticity and section modulus. Modulus of elasticity determines how much stress a metal can safety carry before it begins to deform permanently and section modulus enables the engineer to use geometry to keep the stress within safe bounds. As we have got to know, creative use of section modulus enables relatively weaker metals to do the work of stronger ones.
Copyright ©2001 by SPECIAL PRODUCT CONSULTING
http://specialproduct.net/design.shtml
•
USA
•
09-Jan-14
Page 1 of 2
January 9th 2014
GENERAL
MATERIALS
DESIGN
HANDLING
MAINTENANCE AND REPAIR
Slag Pots Design The shape of a slag pot depends primarily on the operational conditions it has to withstand. Thus, the following design criteria must be taken into consideration z z z z z z
Type of furnace that the slag pot will service, Quantity and type of slag generated, Method of handling and dumping the pot, Heat impact during operation, Dimensional restrictions, Pot maintenance procedures
A slag pot essentially consists of the real container part as well as of the parts necessary for the handling of the pot. Parts that are needed to handle a slag pot are: * at least 2 trunnions to pick it up and move it whereever this should be necessary, * the base to put it down onto the ground * a mechanism to handle the pot by a slag pot carrier, that is, using this mechanism, the pot can be tippped to pour molten slag into slag pits for processing, * at least one tilting lug either to tip the filled pot by a crane or to turn the empty pot in an appropriate position for cooling down or for repair. *
A slag pot with all parts necessary for its handling must be designed to meet the following essentials: z
The thermal expansion due to heat load during operation should be uniform all over the circumference of the slag pot body and should be hindered as few as possible by material accumulations and ribs resulting in section areas of wall thickness transition
http://specialproduct.net/design.shtml
09-Jan-14
SLAG POT DESIGN
z
Page 2 of 2
Likewise an uniform contraction should be aimed at by a steered cooling after dumping.
Thus, there are rules of thumb in developping slag pot designs: * The slag pot should be round. * The bottom of the pot should not be in direct with the ground, but some ground clearance should be forseen. * As few ribs as possible should be placed on the outside of the slag pot. *
All these criteria aim at as good a stability or stiffness as possible to prevent excessive premature deformation and secure the best life history of the slag pot. Details on how to design slag pot trunnions may be found here.
Section Modulus A significant measure of stiffness is section modulus, which is stiffness from shape or geometry. Unlike modulus of elasticity, it has nothing to do with the material. Actually section modulus is an aspect of moment of inertia which is a function of a shape's cross-sectional area in combination with its height. Stiffness from geometry of section modulus is a very powerful engineering tool. The knowledge of section modulus enables the engineer to create metal shapes that are much stiffer than the material itself could ever be. The most significant observation that can be made about stiffness from geometry is that there is no other method besides metal casting that can offer so much geometry in the design and manufacture of component shapes. Because of this, parts to handle a slag pot such as the tilting lugs, are rather cast-on than welded in place. Another significant observation is that design stress in a structural part is directly related to section modulus. In fact, it is a direct, inverse relationship in which increasing section modulus decreases stress. We now see an important synergism between modulus of elasticity and section modulus. Modulus of elasticity determines how much stress a metal can safety carry before it begins to deform permanently and section modulus enables the engineer to use geometry to keep the stress within safe bounds. As we have got to know, creative use of section modulus enables relatively weaker metals to do the work of stronger ones.
Copyright ©2001 by SPECIAL PRODUCT CONSULTING
http://specialproduct.net/design.shtml
•
USA
•
09-Jan-14
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