Steady-state and transient dynamics for sweetening of LPG process

Received: 14 Mar 2022, Revised: 19 May 2022, Accepted: 25 Aug 2022, Available online: 28 Sep 2022, Version of Record: 28 Sep 2022

K. Karthigai Selvan a
,
Mohit Mundra b
,
R.C. Panda c
a
Department of Chemical Engineering, AC Tech, Anna University, Chennai 600025, India
b
Department of Chemical Engineering, BITS-Pilani, Hyderabad 500078, India
c
Department of Chemical Engineering, CSIR-Central Leather Research Institute, Adyar, Chennai 600020, India

Abstract


Amine treating is the most common system for gas sweetening that is used in petroleum, gas and petrochemical industries. Steady-state analysis of the process is conducted on the developed simulation-model using Aspen Hysys. For obtaining more accurate results, absorber internal specifications and feed gas conditions are taken from real industrial plant data. The effect of the system controlling parameters on concentrations of H2S and CO2 in sweet gas is inspected. The manipulated variables for the amine unit are Di-ethanolamine (DEA) solution circulation rate and temperature. Sour gas flow rate and H2S/CO2 mole ratio in feed become disturbance or load; whereas, the control variables are concentration and throughput of sour gas in exit sweet gas. The outcome of the sensitivity study is used to develop MIMO transient models with a first-order plus dead-time (FOPDT)structure for the control studies. Based on the developed model the model predictive control (MPC) and PID controls are implemented for 2 by 2 systems.

Keywords
Reactive absorption
Nonequilibrium modeling
Film model
Hydrogen sulphide (H2S)
Di-ethanolamine (DEA)



Description



   

Indexed in scopus

https://www.scopus.com/authid/detail.uri?authorId=57211624380
      

Article metrics

10.31763/DSJ.v5i1.1674 Abstract views : | PDF views :

   

Cite

   

Full Text

Download

Conflict of interest


“Authors state no conflict of interest”


Funding Information


This research received no external funding or grants


Peer review:


Peer review under responsibility of Defence Science Journal


Ethics approval:


Not applicable.


Consent for publication:


Not applicable.


Acknowledgements:


None.