Abstract
Main problem in air drying unit is the adsorption and regeneration time. In a dryer adsorption continues for eight hours, after which the desiccant becomes saturated and cannot adsorb further moisture. In this study different types of desiccants are used. Instead of silica gel, activated alumina, zeolite, molecular sieves, activated carbon were used. Membrane dryer are used to solve our regeneration problem. Therefore membrane air dryer is more optimum for commercial processes than the other different dryers. Membrane dryer can be used for 24 hours for one week, so there is no need to standby this equipment. The construction and operation cost of membrane dryer is too simple and can also be used in hazardous condition.
Keywords: Adsorption time, Regeneration time, Activated carbon, Membrane dryer
Table of Contents
1. Introduction
1.1 Background
1.2 Objectives
1.2.1 General objective
1.2.2 Specific Objectives
2. Literature Review
2.1 Accessories
2.1.1 Compressor
2.1.2 After Coolers
2.1.3 Separators
2.1.4 Prefilter
2.1.5 Dryer
2.1.6 After Filter
2.1.7 Receiver
2.2 Air Drying Unit
2.2.1 Specification of Drying Unit
2.2.2 Inlet Condition
2.2.1 Outlet Condition
2.2.3 Cycle Time
2.2.4 Filter
2.2.5 Adsorption Cycle
2.2.6 Regeneration & Service Cycle Change Over
2.3 Air Dryer
2.3.1 Dryer Selection
2.4 Expected Outcome
2.4.1 Membrane Dryer
2.5 Balston Compressed Air Dryers
2.5.1 Membrane Air Dryers
2.5.2 Application
2.5.3 Compressed Air Dryers
2.5.4 Application
2.5.5 Importance of Moisture Removal
2.6 Membrane Filtration Technology
2.6.1 Eliminating Downtime and Reducing Maintenance
2.7 Hankison Membrane Compressed Air Dryers
2.7.1 Advantage of Hankison membrane dryer
2.7.2 Choice of Prefilter Package
2.8 Parker Membrane Air Dryer
2.8.1 Membrane Air Dryers for Analytical Instruments - Dry Air on Demand, Up tp 1,203 lpm
2.8.2 Principal Specification
2.8.3 Flow Rates (lpm)
2.9 Prism Membrane Low-Pressure Air Drying
2.9.1 Benefits
2.10 Types of Membranes
2.10.1 Isotropic membranes
2.10.2 Nonporous, dense membranes
2.10.3 Electrically Charged Membranes
2.10.4 Anisotropic membranes
2.10.5 Ceramic, Metal and Liquid Membranes
2.11 Maintenance
3. Working / Implementation of the Project Work/ Simulation
3.1 Cost Estimation in Membrane Air Dryer
3.1.1 Estimated Energy Costs
3.1.2 Actual Energy Cost
3.1.3 Labor Cost
3.1.4 Handling Costs
3.1.5 Estimated Fixed and Capital Costs
3.1.6 Actual Capital Cost
3.1.7 Actual Fixed Cost
3.1.8 Total Drying Cost
3.1.9 Dry or Market Wet
3.2 Cost Estimation
4. Result Analysis
4.1 Advantages of Membrane Dryers
4.2 Disadvantages of Membrane Dryers
4.3 Comparison of Dryer
5. Conclusion
Objectives and Core Topics
The primary research objective is to analyze the application of membrane systems to address critical adsorption and regeneration cycle limitations encountered in industrial air drying units. The study focuses on evaluating the efficiency of membrane dryers as a superior alternative to traditional desiccant-based systems.
- Comparison of traditional desiccant dryers and modern membrane technology.
- Analysis of adsorption and regeneration time constraints.
- Evaluation of membrane systems for continuous operation in industrial environments.
- Techno-economic assessment, including cost estimation and maintenance requirements.
- Performance characteristics in various operating conditions, including hazardous environments.
Excerpt from the book
2.4.1 Membrane Dryer
The most advantageous air dryer is membrane dryer according to its working capacity. Membrane dryer refers to a dehumidification membrane that removes water vapour from compressed air. Typically, the compressed air is first filtered with a high quality coalescing filter. This filter removes liquid water, oil and particulate from the compressed air. The water vapour laden air then passes through the centre bore of hollow fibres in the membrane bundle. At the same time, a small portion of the dry air product is redirected along the outside surface of the fibers to sweep out the water vapour which has permeated the membrane. The moisture-laden sweep gas is then vented to the atmosphere, and clean, dry air is supplied to the application. The drying power of the membrane is controlled by varying the compressed air flow rate and pressure. The membrane air dryers are designed to operate continuously, 24 hours per day, 7 days per week. Membrane air dryers are quiet, reliable and require no electricity to operate. Some dryers are non-porous which means they only permeate water vapour. Porous membranes are modified nitrogen membranes and pass air as well, usually changing the composition of the compressed air by reducing the oxygen content. The only maintenance required is changing the Prefilter cartridge twice a year. Membrane air dryers are used in pneumatic components, spray painting, laser plenum purge, air bearings, air spindles, medical equipment, air guns and pneumatic brakes for vehicles & trains (Murphy, Milton K., Arthur W. Rice, and John J Freeman, 1988).
Summary of Chapters
1. Introduction: Outlines the fundamental components of modern compressed air systems and defines the research scope concerning air treatment equipment.
2. Literature Review: Provides a comprehensive overview of compressed air system accessories, dryer types, and detailed membrane filtration technology.
3. Working / Implementation of the Project Work/ Simulation: Describes the methodology for estimating costs, including energy, labor, and capital expenditures for membrane air drying systems.
4. Result Analysis: Compares the advantages and disadvantages of membrane dryers against traditional desiccant methods, highlighting operational efficiency and cost-effectiveness.
5. Conclusion: Summarizes the findings, affirming that membrane air dryers provide an optimal solution for industrial regeneration and moisture removal challenges.
Keywords
Adsorption time, Regeneration time, Activated carbon, Membrane dryer, Compressed air, Moisture removal, Desiccant, Filtration, Industrial Drying, Energy cost, Maintenance, Coalescing filter, Hollow fibers, Permeation, Pressure dew point
Frequently Asked Questions
What is the core focus of this research?
The research focuses on addressing the limitations of adsorption and regeneration cycles in standard air drying units by investigating the application of membrane drying technology.
What are the primary themes discussed?
The main themes include compressed air system architecture, the operational mechanics of membrane-based moisture removal, and the economic feasibility of switching from traditional desiccant-based dryers.
What is the main objective of the thesis?
The primary objective is to evaluate membrane systems as a more efficient, continuous-operation alternative for moisture removal in industrial air processing to solve existing regeneration problems.
Which scientific methodology is utilized?
The study employs a technical review of existing filtration principles, comparative performance analysis of various dryer types, and a structured cost-estimation model for capital and operational expenses.
What is covered in the main body of the work?
The main body examines accessory components in air systems, detailed specifications of membrane dryers, case studies on maintenance improvements, and a comprehensive cost breakdown.
Which keywords characterize this document?
Key terms include Adsorption time, Regeneration time, Activated carbon, Membrane dryer, Compressed air, and moisture removal efficiency.
Why is the regeneration cycle considered a problem in traditional dryers?
In traditional desiccant dryers, the desiccant becomes saturated after approximately eight hours of use, requiring a lengthy regeneration phase which necessitates standby equipment or downtime.
How do membrane dryers differ in maintenance compared to traditional systems?
Membrane dryers offer significantly lower maintenance requirements as they have no moving parts and do not rely on desiccant materials that require regular replacement, only needing periodic prefilter cartridge changes.
Are membrane dryers suitable for hazardous environments?
Yes, membrane dryers are described as inherently safe and suitable for operation in hazardous, explosive, or corrosive atmospheres due to their design simplicity and lack of electrical requirements.
- Citar trabajo
- Lecturer Temesgen Atnafu (Autor), 2008, Membrane Systems for Adsorption and Regeneration Cycle Problems in Air Drying Unit , Múnich, GRIN Verlag, https://www.grin.com/document/208619
