batch process conrol
TRANSCRIPT
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BATCH PROCESS CONROL
Submitted by:Godwin Scaria
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DEFINITION
A process in which materials or work are stationary at one physical location being treated is termed as batch process
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BATCH PROCESS
Most often of thermal type
If process reaction rate is slow two position (ON/OFF) controller is used
If fast proportional control is used to avoid cycling of temperature
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PROPORTIONAL CONTROL IN BATCH PROCESSGraphical representation is given below :
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ANALYSIS As temperature rises, process begins and valve opens
and as temperature lowers valve closes
In most process, a gradually decreasing valve setting is required in order to balance energy . It is called offset
As long as proportional sensitivity is high offset will also be small
Offset is reduced by integral response
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Large initial overshoot is due to action of integral response
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PREVENTION OF OVERSHOOT
Many electric controllers with integral response incorporate “rate of approach setter”. This device limits the intergral action
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PUPOSE OF BATCH PROCESS
To produce one or more products at A given composition Max amount Best economy(employing least materials, time and
energy)
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THANK YOU