New Electrostatic Precipitators
What is meant by Electrostatic Precipitator?
Also known as an electrostatic air cleaner, the electrostatic precipitator is a device that uses electrical charges to remove impurities. These impurities can either be solid or liquid droplets that come from gases in smokestacks. These particles/impurities are removed with electrical energy that charges the particles either positively or negatively, making them easier to catch.
Electrostatic precipitators are composed of highly-technical parts, including gas distribution plates, discharge electrodes, plates or pipes that collect particles on the surface, and rappers.
The advantages and disadvantages of Electrostatic Precipitators
- It can handle large gas volumes and heavy dust loads at low pressures
- It has low energy operating cost
- It can be used for the collection of both dry and wet impurities
- The durability is high
Capital investment is high
- Not adaptable to change in operating conditions
- Can be used for gaseous emissions
- Space requirements
An electrostatic precipitator is a highly efficient particulate collection device that removes particulate matter from a gas stream using electrostatics. The technology was developed in the early part of the twentieth century and has evolved to play a major role across a wide range of particulate collecting and control applications.
Electrostatic precipitators can be part of a process that recovers the product from the gas stream so it can be reused. Most precipitators however, are air pollution control devices which eliminate the emission of these fine dust particles, commonly referred to as “smoke” into the environment.
At AirTek we engineer, design, fabricate, and erect Electrostatic Precipitators (ESPs) for many industries including:
- Power Generation
- Pulp & Paper
- Rock Products
Applications served within these industries are:
- Coal Fired Boilers
- Wood Fired Boilers
- Combination Fired Boilers
- Recovery Boilers
- Lime and Cement Kilns
Our ESPs are designed for:
- High Collection Efficiencies
- Low Emissions
- Minimal Pressure Loss
- Minimal Operational Downtime
- Low Initial Capital
We can partner with you to provide a range of services for our own and other manufacturers Air Pollution Control equipment located in your facility. Services include:
- Repairs and Upgrades
- Engineering & Design Services for Major Repairs, Rebuilds or Upgrades
- Fabrication, Procurement & Installation Services for Rebuilds or Upgrades
AirTek Electrostatic Precipitator
AirTek incorporates the latest technology in our precipitator design including:
- Collecting Plates
- Rigid Discharge Electrodes
- Direct Rapping
- Roof Mounted Electro-magnetic Rapping Systems
- Microprocessor Automatic Voltage Controls to Ensure Optimal Collection Efficiencies
These features are described below.
700 Hudson Street
Troy, Al 36079
The AirTek shop assembled collecting plate is designed for maximum structural integrity and rapping efficiency. The collecting plate is constructed of roll-formed segments (modules) which are secured with welds between the vertical modules. Upper support and lower guide tubular stiffeners are attached to the modules. The tubular edge prevents arcing that may occur where the discharge electrodes pass through collecting zones at the top and bottom of the collecting plate. These members also maintain straightness and provide structural rigidity for the collecting plate which is important for proper alignment. The upper stiffener serves an additional purpose which is to transmit the rapping energy for direct plate rapping as described below. Collecting plates can be provided in 16 or 18 gauge thicknesses, carbon steel, and other material for special applications.
Key features of the AirTek design are:
- Maximum Structural Integrity and Stiffness
- Superior Rapping Characteristics
- Uniform Thermal Expansion
- Accurate Plate Alignment
- No Field Assembly
AirTek’s Rigid Discharge Electrode (RDE) consists of a 1½ or 2-inch diameter tube with corona generating pins. This results in an RDE which is structurally rigid, provides the required stiffness for proper alignment, and is virtually unbreakable.
The welded pin design allows the pin arrangement to be customized for the application. The vertical spacing of the pins on the tube can be varied, the pins can be staggered or opposed, the pins can be angled off the centerline of the tube, and the length can be varied. Both spacing and angling of the emitter pins will optimize the corona onset voltage, maximize the voltage field, and create conditions to produce high electrical field strength. Factors that must be considered in determining the proper electrode arrangement to assure performance requirements are attained include the type of material collected, particle size, and particulate loading.
Direct Plate Rapping
AirTek supplies a direct collecting plate rapping system that ensures superior acceleration and maximum transfer of rapping energy into the collecting plate. The direct plate rapping system allows the rapping energy to transfer directly into the collecting plates and not through the collecting plate support channels. There are no welded connections between the rapper rod and collecting plate which is a common failure point in other designs. Two collecting plates are rapped at a time to minimize rapping loses (re-entrainment) that can cause opacity spikes. Rapping smaller collecting plate areas requires less impact energy, prolongs the life of the equipment, and reduces maintenance costs.
Key features include:
- Maximized Transfer of Rapping Energy into the Collecting Plates
- Reduced Re-entrainment
- Maximized Precipitator Efficiency
- Increased Equipment Life
- Reduced Maintenance
- Electromagnetic Rappers
AirTek has chosen not to be a supplier or manufacturer of transformer rectifier automatic voltage controllers, rapping controllers, or data management systems. This allows AirTek to stay on the leading edge by being able to purchase the latest control technology available for our customers. This also allows AirTek to provide any control system which the customer desires or may already have in their facility.
Scope of safety equipment products provided by AirTek
AirTek will supply all the material necessary for a complete operational electrostatic precipitator.
Material which is considered part of the standard precipitator scope of supply includes:
- Key Interlock Systems
- Access Doors
- Wrappers and Controls
- Plenums or Nozzles
- Transformer Rectifiers and Controls
- Purge Air Systems
- Access Facilities
AirTek will also supply the following material which would be considered Optional or Balance of Plant:
- Support Steel
- Slide Gates
- Weather Enclosure
- Material Handling Equipment
- Motor Control Centers
- Monorail Systems
- Expansion Joints
- Prefabricated Control Rooms
- Control Systems
AirTek will also supply the following Erection Services:
- Construction Management
- Thermal Insulation and Installation
- Mechanical Erection of ESP
- Low Voltage Wiring
We also offer complete turnkey solutions through installation of our equipment by our construction crews who are experienced and knowledgeable in the erection of ESPs.