Question: Suppose that the temperature in an exothermic continuous stirred-tank reactor is controlled by manipulating the coolant flow rate using a control valve. A PID controller

Suppose that the temperature in an exothermic continuous stirred-tank reactor is controlled by manipulating the coolant flow rate using a control valve. A PID controller is used and is well tuned. Which of these changes could adversely affect the stability of the closed-loop system?
(a) The span of the temperature transmitter is increased from 20 ^∘C to 40 ^∘C.
(b) The zero of the temperature transmitter is increased from 15 ^∘C to 20 ^∘C.
(c) The control valve trim is changed from linear to equal percentage.
(d) The feed flow rate is doubled.

Step by Step Solution

★★★★★

3.37 Rating (163 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Note This exercise is best understood after the material in Ch 11 has been considered a Changing the ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (2 attachments)

1602_606321ef18c72_680281.pdf

180 KBs PDF File

1602_606321ef18c72_680281.docx

120 KBs Word File

Students Have Also Explored These Related Process Dynamics Control Questions!

A stirred-tank heating system is shown in Fig. E13.9. Briefly critique these two control strategies. (a) It is proposed that h and T be controlled by manipulating w h and w c using two PI...

A PID controller is used to control the temperature of a jacketed batch reactor by adjusting the flow rate of coolant to the jacket. The temperature controller has been tuned to provide satisfactory...

The product quality from a catalytic tubular reactor is controlled by the (low rate of the entering stream, utilizing composition measurements from a process gas chromatograph. The catalyst decays...

19. Consider the chemical reactor system shown in Fig. P7-4. An exothermic catalytic reaction takes place inside the reactor tubes. The reactor is cooled by an oil flowing through the shell of the...

answer question c,d Q1. Analyze the following industrial processes from process control viewpoint by identifying the (i) control objective, (ii) control, manipulated, and disturbance variables, (iii)...

EXPERIMENT G1: Dynamic Response Modelling & Temperature Controller Tuning in a Jacketed Flow Reactor Objective This experiment involves a jacketed, mixed flow reactor in which an exothermic (heat...

a. Example 13-1: Batch Reactor with an Exothermic Reaction Wolfram 1. Adiabatic Case: Use Wolfram to see whether you can find a trajectory that is ready to ignite and whose trajectory looks like a...

EXPERIMENT G1: Dynamic Response Modelling a Temperature Controller Tuning in a Jacketed Flow Reactor Objective This experimeot involves a jacketed, mixed flow reactor in which an exochermic (heat...

I need someone help me understand and solve this problem. Table A is in photo no. 2 - Choose your parameters from Table A at the end of the assignment. - You should provide valid assumptions for all...

A stirred-tank reactor has an internal cooling coil to remove heat liberated in the reaction. A proportional controller is used to regulate coolant flow rate so as to keep the reactor temperature...

The concentration of total phosphorus ( p in mg/m 3 ) and chlorophyll ( c in mg/m 3 ) for each of the Great Lakes in 1970 was The concentration of chlorophyll indicates how much plant life is...

Use the concept map to create a detailed outline of your Comprehensive Literature Review paper. This assignment is intended to help you find a logical focus to your writing and to help alleviate...

Which of the following can be used to calculate the required rate of return of a common stock whether or not it paysa dividend?

=+ Pull control is a system whereby demand is triggered by requests from a work centres (internal) customer. Push control is a centralized system, whereby control decisions are issued to work centres...

A decanter shown in Fig. E. is used to separate a feed that consists of two completely immiscible Liquids, a light component and a heavy component. Because of the large difference in their densities,...

A process to be controlled has two controlled variables Y1 and Y2, and three inputs that can be used as manipulated variables, U1, U2, and U3. However, it is desired to use only two of these three...

A process control engineer has decided to install an automated shower control system in a bathroom of hr mansion. The design calls for a system that can deliver 3 gpm of water at 110F by mixing hot...

QUESTION 4 8 A projected negative annual cash flow indicates: a . Projected cash inflows are less than projected cash outflows. b . Net farm income will be negative. c . Depreciation expense is too...

Suppose a life insurance company sells a $220,000 one-year term life insurance policy to a 22-year-old female for $370. The probability that the female survives the year is 0.999608. Compute and...

You purchased 2,600 shares in the New Pacific Growth Fund on January 2, 2010, at an offering price of $41.60 per share. The front-end load for this fund is 5 percent, and the back-end load for...