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Simulation & Economic evaluation of 20 MMSCFD gas sweetening process by using Aq. MDEA as absorbent

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Project SupervisorDr. Saeed Gul (Associate Professor)

Co-SupervisorEngr. Abdul Hai

Names of students Muhammad Idrees -------(12PWCHE0709)Ajmal Khan ---------------(12PWCHE0709)Ilyas khan -----------------(12PWCHE0709)Danish Hayat --------------(12PWCHE0709)

A project on a plant of Ocean Pakistan Limited (OPL)

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Project progress

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

1st presentation Introduction Lit. Review

2nd presentation Material Balance Energy Balance

&these topics will be presented in 3rd presentation

Plant design Instrumentation & process control

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Summary of the project

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

In this project , Acid Gas Removal Unit (AGRU) will be simulated and analysed

And the resulting data will be compared with the original data obtained from the plant for the validation of our data

All the process parameters are well known

HYSYS V-8.8 will be used for the simulation and economic evaluation of the process

Finally process improvements will be suggested

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Plant Design (Absorber design)

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Parameters considered for absorber:

length of column diameter of Column thickness of wall number of plates in absorber thickness of each plate Total volume of absorber efficiency of each plate efficiency of absorber column

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Absorption column design

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Absorber : Absorber is a vertical column in which absorbent is used

to remove desired component from the gas

Selection of Solvent : Aqueous solution of MDEA having 50 W/W %age

solution was selected on the basis of the requirement of actual plant

Gas absorption: is the removal of one or more selected components form a

mixture of gases by absorption into a suitable liquid.

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Types of absorber

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Absorption column may be

Packed column

Plate column

Bubble column

Spray column

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Absorber Design

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

1. Calculation of theoretical number of stages.2. Calculation of actual number of stages.3. Calculation of diameter of the column.4. Calculation of weeping point.5. Calculation of pressure drop.6. Down comer Design.7. Calculation of the height of the column

Standard Design Steps

Absorber

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Calculations of Absorber design

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Theoretical number of stagesTheoretical number of stages can be found by the use of :

* The kremser method (page 704, vol.6 Coulson and Richardson’s “Chemical Engineering”)

Where,Eai = efficiency of the absorberAio = Operating absorption factorN = No. of stages = 13.7 => 14

Actual number of stages

Actual number of stages = theoretical stages/efficiency Efficiency = 70%

N (Theo.) = 14 N (Actual) = 20

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Calculations of Absorber design

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Diameter of the columnFirst Flooding velocity was found

Where, Uf = Flooding vapor velocity in m/s , Uf = 0.24 m/sK1 = Constant from (FLV & K1) , K1 = 0.036

Calculation of Pressure drop:ΔPt = 9.81 x 10-3ht PL = 0.248 Psi

= 0.24 m/s

= 1.98 m

* The kremser method (page 704, vol.6 Coulson and Richardson’s “Chemical Engineering”)

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Calculations of Absorber design

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Calculation of height of column: No. of plates = 20 Plate spacing = 0.6 m Plate thickness = 0.005 m Total plate thickness = 0.1 m Top clearance = 1 m Bottom clearance = 1 m

Total height = 14.1 m

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Instrumentation and process control

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

SafetyEnvironmental Protection

Equipment ProtectionSmooth Operation/Production Rate

Product QualityHigh profit

Monitoring and Diagnosis

Importance of I & C

Instrumentation & process controlI & PC is defined as the measurement and control of process variables within a production area. The process variables used in industries are Level, Pressure, Temperature, Humidity, Flow, pH, Force, Speed etc.

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Instrumentation and process control

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

Process: Any operation or series of operations that produce a

desired final result is a process

Components of the control system

Controller: The controller is the mechanism that responds to any error indicated by the any error detecting mechanism.

Final control element: The final control element receives the signal from the

controller and by some predetermined relationship changes the energy input to the process.

Measuring Means:The instrument used for the measurement of desired variable

is called measuring instrument

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Types of Control System

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

FEED FORWARDCONTROL

Type of control system may be

FEED BACKWARDCONTROL

Feed back control involves the detection of the

controlled variable and counteracting of charges its

value relative to set point, by adjustment of a manipulated

variable

Feed forward control system is a system in which

corrective action is based on measurement of

disturbances inputs into the process

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Feed back control system on absorber

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan

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Thank You

Department of Chemical Engineering, University of Engineering and Technology Peshawar, Pakistan