Scaling Down Techniques

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mechatronics engineer Participant Join Date: Feb 2008 Posts: 3	Scaling Down Techniques 02/06/2008 7:57 AM
	i m working on a project to control and monitor the temperature and humidity of the scaled down model of rotary kiln. can anybody please help me that how could we scale down a model because in actual rotary kilns are almost 64m long with 4.5 or 4 meter diameter.i have scaled it to 4 or 5 ft length with 6 inch diameter according to availability of material but i have no authentic method of scaling it. so kindly any body tell me any source or material relating to scaling down techniques.i shall be very thankful
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caramba Guru Join Date: Jan 2008 Location: Kazakhstan Posts: 753 Good Answers: 8	#1 Re: Scaling Down Techniques 02/06/2008 8:36 AM
	I would suggest you to apply theory of dimensions and similarity. Just dynamic similarity.
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Paddler Power-User Join Date: May 2007 Location: Sweet home Alabama Posts: 144 Good Answers: 7	#2 Re: Scaling Down Techniques 02/06/2008 8:56 AM
	Not much to go on. I am assuming that you are trying to lower and control the internal surface area of calcined materials and not just making cement. The three parameters most scale downs require are residence time, temperature profile and mixing. The ability to get the product up to temperature without fracturing either the particle or changing the internal morphology and then treating at elevated temperature is not simple. A warm up zone that matches gas release and product porosity may be part of the existing kiln without your knowledge. or more simply the feed will pop open if heated too fast. Where are you? The US and may require opening Title 5 permit for a new point source if you intend to sell product from this device. Need to know: What are you doing? What is the temp history required? How friable is the product? Is it electric heat/ direct fire/ gas fired on the external of the shell/ Is it a reduced oxygen, nitrogen or enriched atmosphere? Are the lifters, paddles, internal flights and what is the angle of the kiln? Is there backmixing by lifters? What is the residence time? What is the bed depth and how is it controlled? I don't know any reference materials to do this. It takes an understanding of your product and process to do what you are trying to do. Don't expect much more help without details.
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Anonymous Poster	#4 In reply to #2 Re: Scaling Down Techniques 02/12/2008 5:40 AM
	hello we are controoling and monitoring the scaled down model of rotary kiln we are using mild steel pipe. temperature inside the pipe is almost 300 centigrade we are using gas burner for heating(enriched atmosphere). angle of kiln is about 3 to 4 percent of original length almost 2degree in real cases no backmixing by lifter residence time yet to calculate we are controlling the rpm of motor to control the roataion of pipe (rpm 2) in real cases lenght of rotary kiln or ms pipe 64meter diametr 4 to 5m thickness 30 to 60mm angle 3 to 4percent of original length temperature 900 to1100 centigrade rpm 3 these are the actual parameters now we want that length should be 5 to 6 ft or in any other aceptable range with dia about 6 inches (not too small as comapre to length) plz reply us soon we will be very thankful to you as this is our verey important project and we are left with very shorttime we need some authntic scale down technique to scale down the model
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drkmntn Member Join Date: Jul 2007 Location: Upstate New York Posts: 8	#6 In reply to #4 Re: Scaling Down Techniques 02/12/2008 10:32 AM
	The scaling "technique" (as you call it) is going to depend on what part of your process you want to scale and for what purpose. It is impossible to scale all dimensions perfectly and you have to prioritize according to your goals. If it is really important, you need some scaling expertise to assist you if you do not have time or resources to develop it yourself. drkmntn@gmail.com __________________ a single fact can spoil a good argument
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drkmntn Member Join Date: Jul 2007 Location: Upstate New York Posts: 8	#3 Re: Scaling Down Techniques 02/07/2008 9:29 AM
	Good scaling is not a trivial exercise. I have been doing scaling of power plants for several years now and every time i learn something new. Depending on the purpose of your scaling you may require a little more analytical sophistication than just a ratio of dimensions. If it is really important, shoot me an email and we can talk. drkmntn@gmail.com __________________ a single fact can spoil a good argument
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Anonymous Poster	#5 In reply to #3 Re: Scaling Down Techniques 02/12/2008 5:48 AM
	Hello, Sir, we are controlling and monitoring the scaled down model of rotary kiln we are using mild steel pipe. temperature inside the pipe is almost 300 centigrade we are using gas burner for heating(enriched atmosphere). angle of kiln is about 3 to 4 percent of original length almost 2degree in real cases no backmixing by lifter residence time yet to calculate we are controlling the rpm of motor to control the roataion of pipe (rpm 2) in real cases lenght of rotary kiln or ms pipe 64meter diametr 4 to 5m thickness 30 to 60mm angle 3 to 4percent of original length temperature 900 to1100 centigrade rpm 3 these are the actual parameters now we want that length should be 5 to 6 ft or in any other aceptable range with dia about 6 inches (not too small as comapre to length) plz reply us soon we will be very thankful to you as this is our very important project and we are left with very short time we need some authntic scale down technique to scale down the model
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Users who posted comments:

Anonymous Poster (2); caramba (1); drkmntn (2); Paddler (1)

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