Download - CO2 Liquefaction Plant
CO2 Liquefaction Plant
Pakarab Fertilizers Ltd. Multan
Scope
Introduction What is liquefaction? Design Basis Process Flow Diagram Major Equipments Refrigeration System Applications of CO2
Introduction
The CO2 Recovery Plant is designed for the recovery of impure, low pressure CO2 gas from the ammonia plant by-product gas and produce purified, high pressure liquid CO2.
Capacity 8MT/h. Liquid CO2 Temperature= -20 C
Pressure = 21 bar
What is Liquefaction?
The liquefaction of gases is a complicated process that uses various compressions and expansions to achieve high pressures and very low temperatures Liquids.
The process of refrigerating a gas to a temperature below its critical temperature so that liquid can be formed at some suitable pressure, also below the critical pressure.
Design Basis
Component Feed Gas Product Liquid
CO2 78.92% 99.94 %
H2O 18.74 % 0
CO 0.004063 % 0.000204 %
N2 0.879 % 0.012 %
Ar 0.15 % 0.046415 %
H2 1.3 % 0
Acetaldehyde 0.004 % 0
Methanol 0.0055 % 0
Benzene 0.000001 % 0
Major Equipments
Screw Compressors Knock Out Drums Coolers Condenser Evaporative Condenser Dryer Scrubber Stripper
Screw Compressor
The single screw oil lubricated compressor is a rotary, positive displacement compressor which incorporates a main screw and two gaterotors.
Range 100psig-350psig Easy capacity control Less moving parts Less maintenance cost
CO2 Gas Scrubbing
Removes water soluble impurities Counter Current Flow of Gas Water Level Control Flow control of raw water
Knock Out Drums
Removes moisture Deflective Plate Demister pad Auto drain system
Coolers and Condenser
Flooded type heat exchangers Level control of refrigerant Refrigerant Pressure Control
CO2 Gas Dryer
Deodourizer
Desiccant
Activated Carbon
Selexsorb CD
Molecular Sieve
FeaturesAMLOC Probe
Dew Point Analyzer
Stripping System
Stripping of impure liquid CO2 is carried out by counter current flowing pure CO2 vapors from reboiler
CO2 gas venting from top is recondensed by reflux condenser
Refrigeration System
This system includes Two Screw Compressors Evaporative Condenser Receiver Throttling in let valves Evaporators (Exchangers)
PT Diagram of Ammonia
Ammonia Evaporative Condenser
Major Parts Cooling Coils Drift Eliminator Air Inlet Louvers Induced Draft Fan Distribution Nozzles
Applications of CO2
Beverages Dry Ice Food preservation Urea Manufacturing Fire Extinguishing
Pakistan Market
85%
5% 5% 5%
Beverages Food Preservation Dry Ice Others
Thank You