What does DFT mean in UNCLASSIFIED
DFT stands for Deaerating Feed Tank, a critical component in power plants and industrial water systems. Its primary function is to remove dissolved oxygen and other non-condensable gases from boiler feedwater to prevent corrosion and damage to downstream equipment.
DFT meaning in Unclassified in Miscellaneous
DFT mostly used in an acronym Unclassified in Category Miscellaneous that means Deaerating Feed Tank
Shorthand: DFT,
Full Form: Deaerating Feed Tank
For more information of "Deaerating Feed Tank", see the section below.
Function of DFT
- Oxygen Removal: DFTs employ a combination of heating and mechanical methods to remove dissolved oxygen from feedwater. Oxygen reacts with metal surfaces in boilers, causing corrosion and reducing equipment lifespan.
- Gas Removal: DFTs also release non-condensable gases, such as nitrogen and hydrogen, which can interfere with heat transfer and cause cavitation in pumps.
- Temperature Adjustment: DFTs heat the feedwater to a temperature slightly below the boiling point, ensuring that no dissolved gases remain in the water before it enters the boiler.
Benefits of Using DFT
- Corrosion Prevention: Removing dissolved oxygen significantly reduces corrosion in boilers, piping, and other components.
- Increased Boiler Efficiency: Non-condensable gases can trap steam bubbles, reducing heat transfer efficiency. DFTs eliminate these gases, improving boiler performance.
- Reduced Maintenance Costs: Corrosion and gas-related damage can lead to costly repairs and downtime. DFTs help minimize these issues, reducing maintenance expenses.
Types of DFTs
- Tray-Type DFT: Utilizes trays with perforated plates to promote contact between water and steam, facilitating oxygen release.
- Spray-Type DFT: Sprays feedwater into a spray chamber where it mixes with steam, removing dissolved gases.
- Venturi-Type DFT: Employs a venturi nozzle to create a vacuum, releasing non-condensable gases while heating the feedwater.
Essential Questions and Answers on Deaerating Feed Tank in "MISCELLANEOUS»UNFILED"
What is a Deaerating Feed Tank (DFT)?
A Deaerating Feed Tank (DFT) is a device used in power plants and industrial processes to remove dissolved gases, primarily oxygen, from boiler feedwater. Deaeration prevents corrosion and other damage to boiler components and improves the efficiency of the boiler system.
Why is it important to remove oxygen from boiler feedwater?
Dissolved oxygen in boiler feedwater can cause corrosion of boiler tubes, fittings, and other components. Oxygen reacts with iron to form iron oxide, which can lead to pitting and tube failure. Additionally, oxygen can interfere with heat transfer, reducing the efficiency of the boiler.
How does a Deaerating Feed Tank work?
A DFT typically consists of a pressure vessel with a spray nozzle, steam inlet, and vent condenser. Feedwater is pumped into the DFT and sprayed into the vessel, creating a fine mist. Steam is injected into the vessel, which heats the feedwater and releases the dissolved gases. The gases are then removed by a vent condenser.
What are the benefits of using a Deaerating Feed Tank?
Benefits of using a Deaerating Feed Tank include:
- Reduced corrosion of boiler components
- Improved boiler efficiency
- Reduced maintenance costs
- Extended boiler life
What are the different types of Deaerating Feed Tanks?
There are two main types of DFTs:
- Non-storage DFT: Removes oxygen but does not store feedwater.
- Storage DFT: Both removes oxygen and stores feedwater.
What are the key factors to consider when selecting a Deaerating Feed Tank?
Key factors to consider include:
- Capacity (flow rate and storage volume)
- Operating pressure and temperature
- Water chemistry requirements
- Space constraints
Final Words: DFTs play a vital role in water treatment systems by removing dissolved oxygen and non-condensable gases. They enhance boiler efficiency, prevent corrosion, and reduce maintenance costs, ensuring the safe and efficient operation of power plants and industrial facilities.
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