Batch process conrolin process control

1. BATCH PROCESS CONROL
Submitted by:
Godwin Scaria

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

3. 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

4. PROPORTIONAL CONTROL IN BATCH PROCESS
Graphical representation is given below :

5. 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

6.  Large initial overshoot is due to action of integral
response

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

8. PUPOSE OF BATCH PROCESS
To produce one or more products at
 A given composition
 Max amount
 Best economy(employing least materials, time and
energy)

9. THANK YOU