- Steam Theory
- 1. Basics of Steam
- 2. Steam Heating
- 3. Basics of Steam Traps
- 4. Steam Trap Selection
- Steam Trap Selection: How Application Affects Selection
- Steam Trap Selection: Understanding Specifications
- Steam Trap Selection: Safety Factor and Life Cycle Cost
- Traps and Orifices Part 1
- Traps and Orifices Part 2
- Casting vs. Forging
- Applications of Different Types of Steam Traps
- Don't Get Steamed : Selecting Steam Trap Design
- Understanding Steam Traps
- Compare Two Fixed Orifice Venturi Products to a Variable Orifice Free Float Steam Trap
- 5. Steam Trap Problems
- 6. Steam Trap Management
- 7. Water Hammer
- Water Hammer: What is it?
- Water Hammer: The Mechanism
- Water Hammer: Cause and Location
- Water Hammer: In Steam Distribution Lines
- Water Hammer: In Equipment
- Water Hammer: In Condensate Transport Piping
- Identifying Water Hammer Using a Thermal Camera
- Mitigation of Water Hammer in Vertical Flashing Condensate Transport Piping
- Stop Knocking Your Condensate Return
- Steam Trap Management: Do Something; Anything. Please!
- 8. Risk Mitigation
- 9. Steam Quality
- 10. Steam Distribution
- 11. Condensate Recovery
- Introduction to Condensate Recovery
- Returning Condensate and When to Use Condensate Pumps
- Condensate Recovery: Vented vs. Pressurized Systems
- Condensate Recovery Piping
- What is Stall?
- Methods of Preventing Stall
- Cavitation in Condensate Pumps
- Steam Heat Exchangers are Underworked and Over-Surfaced
- Allocate New Plant Focus to Steam System Design—Part 2
- 12. Energy Efficiency
- Tips to improve steam plant efficiency
- Advice on Winter Preparation for Steam Systems
- Insulating Traps
- Steam Compressors
- Why Save Energy?
- Management Strategies for Conserving Energy
- Recovering Steam Clouds and Waste Heat
- Waste Heat Recovery
- Boiler Energy Saving Tips
- Steam Line Energy Saving Tips
- Steam-Using Equipment Energy Saving Tips
- Handle Steam More Intelligently
- Optimize the Entire Steam System
- Use Available Data to Lower System Cost
- 13. Compressed Air / Gas
- 14. Other Valves
Air Compressor Energy Saving Tips
Efforts to Reduce the Electrical Energy Used by Air Compressors
Compressed air is used for various purposes, some of which include power generation, transportation, paint spraying, instrumentation/controls, and cleaning. Because of its versatility, it is used not only in industrial plants but also in office buildings, hospitals, and other types of facilities.
Air compressors play an important role in each of these facilities, and their energy consumption can make up a significant percentage of total energy use. Since compressed air is often the most expensive utility, operating costs can be significant. This is why, in recent years, increasing numbers of plants and facilities have started taking steps to reduce the amount of energy used by air compressors.
Methods of Reducing Air Compressor Energy Use
What should general users do to reduce the energy used by air compressors? TLV recommends taking the following steps.
- Create and manage an air compressor operating schedule.
- Fix existing system leaks.
- Examine whether spray pressure can be reduced.
- Use cooler supply air.
- Clean air filters regularly.
- Optimize air system condensate drainage with TLV air traps and separators designed to remove moisture and conserve air.
Identify idle periods when the compressor can be shutdown.
Large leaks will be audible, while smaller leaks will need to be identified by ultrasonic leak detection technology.
A spray pressure reduction of 0.1 MPa (1 bar, 15 psi) can lower electrical energy consumed by the air compressor by approximately 4 - 5% (depending on the type of air compressor and number of years in use). This drop in pressure can also lead to a decline the amount of compressed air lost from unrepaired leaks.
For example, drawing in 10°C (50°F) air from outside the facility rather than 30°C (86°F) air from inside can reduce the air compressor’s energy consumption by 3%.
Cleaning filters and reducing supply resistance to the air compressor to below 200mmAq (8 inH2O) can reduce energy consumption by 1%.
Removing moisture to protect equipment and products is a critical function in compressed air systems. This important job is often inefficiently achieved by blowdown valves being left open or timer-based systems not configured to match moisture loads during different seasons.
TLV air traps modulate automatically to remove moisture continuously and prevent unnecessary compressed air loss. Likewise, TLV’s super cyclonic-effect, high efficiency separators work to continuously remove moisture from air, and can deliver high quality air of up to 99.8% dryness.
For more information about these technologies, see these pages:
The Importance of Preventing Air Leaks
As a final point, TLV advises users to take whatever steps necessary to prevent leaks from pipes and pipe fittings.
TLV survey data has revealed that compressed air lines with pinhole leaks can lose over 30% of supplied air. This amount of wastage should not be ignored.
Suppose that in a system operating at 0.5 MPaG (5 barg, 73 psig) for 8,400 hours a year, a compressed air line has a 1 mm (0.03 in) wide leak. 25,704 m3 (907,728 cu ft) of compressed air would be lost from such a leak in one year. If the cost of compressed air is US$0.02 per m3 (around US$0.00056 per cu ft), the compressed air lost from that one leak would equate to a loss of around US$505 per year.
Compressed air leaks are often overlooked. However, the number of leaks and the volume of the air leaked increases as the system ages, so it is important to inspect the entire plant for leaks at least once a year to limit financial loss and test the efficiency of the system.
Want to schedule an inspection of your compressed air lines, or discuss strategies for optimizing your compressed air system? Talk to an expert at TLV today.
|Preventing Clogging of Air Traps||Improving Compressed Air Quality and Countermeasures Against Leaks|