BATCH PROCESS CONROL

Submitted by:Godwin Scaria

DEFINITION

A process in which materials or work are stationary at one physical location being treated is termed as batch process

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

PROPORTIONAL CONTROL IN BATCH PROCESSGraphical representation is given below :

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

Large initial overshoot is due to action of integral response

PREVENTION OF OVERSHOOT

Many electric controllers with integral response incorporate “rate of approach setter”. This device limits the intergral action

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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