Adsorbers

Documentation for adsorption equipment in NeqSim.

Table of Contents

Overview

Location: neqsim.process.equipment.adsorber

The adsorber package provides equipment for modeling gas treatment processes using solid adsorbents. Adsorption is commonly used for:

SimpleAdsorber

The SimpleAdsorber class models a simplified adsorption column for gas treatment applications.

Class Hierarchy

ProcessEquipmentBaseClass
└── SimpleAdsorber

Constructor

import neqsim.process.equipment.adsorber.SimpleAdsorber;
import neqsim.process.equipment.stream.Stream;

// Basic constructor
SimpleAdsorber adsorber = new SimpleAdsorber("CO2 Adsorber");

// Constructor with inlet stream
SimpleAdsorber adsorber = new SimpleAdsorber("CO2 Adsorber", feedStream);

Key Properties

Property Description Default
numberOfStages Number of theoretical stages 5
numberOfTheoreticalStages Theoretical stages (continuous) 3.0
absorptionEfficiency Removal efficiency (0-1) 0.5
HTU Height of Transfer Unit (m) 0.85
NTU Number of Transfer Units 2.0
stageEfficiency Per-stage efficiency 0.25

Key Features

CO2 Absorption with MDEA

The SimpleAdsorber is configured for CO2 removal using MDEA (methyldiethanolamine) solvent:

// Create gas feed with CO2
SystemInterface gasFluid = new SystemSrkEos(298.15, 50.0);
gasFluid.addComponent("methane", 0.85);
gasFluid.addComponent("CO2", 0.10);
gasFluid.addComponent("nitrogen", 0.05);
gasFluid.setMixingRule("classic");

Stream feedGas = new Stream("Feed Gas", gasFluid);
feedGas.setFlowRate(10000.0, "Sm3/hr");

// Create adsorber
SimpleAdsorber adsorber = new SimpleAdsorber("CO2 Removal", feedGas);

// Run
adsorber.run();

// Get treated gas
StreamInterface treatedGas = adsorber.getOutStream(0);
System.out.println("CO2 in treated gas: " + 
    treatedGas.getFluid().getComponent("CO2").getx() * 100 + " mol%");

Multiple Output Streams

The adsorber provides two output streams:

Usage Examples

Basic CO2 Removal

import neqsim.process.equipment.adsorber.SimpleAdsorber;
import neqsim.process.equipment.stream.Stream;
import neqsim.thermo.system.SystemSrkEos;

// Create sour gas
SystemInterface sourGas = new SystemSrkEos(298.15, 50.0);
sourGas.addComponent("methane", 0.80);
sourGas.addComponent("ethane", 0.05);
sourGas.addComponent("CO2", 0.10);
sourGas.addComponent("H2S", 0.02);
sourGas.addComponent("nitrogen", 0.03);
sourGas.setMixingRule("classic");

Stream feed = new Stream("Sour Gas Feed", sourGas);
feed.setFlowRate(5.0, "MSm3/day");

// Create and run adsorber
SimpleAdsorber acidGasRemoval = new SimpleAdsorber("AGRU", feed);
acidGasRemoval.setAbsorptionEfficiency(0.95);
acidGasRemoval.run();

// Results
StreamInterface sweetGas = acidGasRemoval.getOutStream(0);
System.out.println("Sweet gas CO2: " + 
    sweetGas.getFluid().getComponent("CO2").getx() * 1e6 + " ppm");

Integration in Process System

import neqsim.process.processmodel.ProcessSystem;

ProcessSystem process = new ProcessSystem();

// Add equipment
process.add(feedStream);
process.add(adsorber);
process.add(treatedGasExport);

// Run complete process
process.run();

Parameters

Setting Absorption Efficiency

// Set 95% removal efficiency
adsorber.setAbsorptionEfficiency(0.95);

Setting Stage Parameters

adsorber.setNumberOfStages(10);
adsorber.setNumberOfTheoreticalStages(7.5);
adsorber.setStageEfficiency(0.75);

Transfer Unit Parameters

adsorber.setHTU(0.5);  // Height of Transfer Unit in meters
adsorber.setNTU(4.0);  // Number of Transfer Units

Mechanical Design

The SimpleAdsorber supports mechanical design calculations through AdsorberMechanicalDesign:

import neqsim.process.mechanicaldesign.adsorber.AdsorberMechanicalDesign;

AdsorberMechanicalDesign design = adsorber.getMechanicalDesign();
design.calcDesign();

System.out.println("Vessel diameter: " + design.getInnerDiameter() + " m");
System.out.println("Vessel height: " + design.getTotalHeight() + " m");

See Also