Engineered Equipment

Hamon Research-Cottrell Aftermarket Services can lower the operating costs, improve the performance and extend the life of your pollution and emissions control equipment. The capabilities of the company behind these services are beyond compare. Hamon Research-Cottrell its affiliates and acquisitions have supplied over 5,100 new pollution and emissions control devices and enhanced, upgraded or rebuilt over 2,500 units worldwide. It maintains a technical staff with hands-on experience with all pollution and emissions control brands and components supplied by aftermarket companies. Our staff can provide on-site support services, remote trouble shooting and a host of other services that keep plants operating in the most challenging situations.

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The pages below note just a few of the tools and equipment that Hamon Research-Cottrell can offer our customers to optimize their units operation, improve their pollution and emissions control performance and fit their financial needs.

Many of the precipitators in operation today were sized and designed to meet performance requirements that are far below current requirements. Time has also taken its toll on the robust machines built many years ago. Most units can be upgraded, repaired or rebuilt to extend their life and improve their performance. Hamon Research-Cottrell has the experience to insure that modifications meet the objectives of today's precipitator operators. Hundreds of precipitators have been modified to meet more stringent performance requirements. Units built in the 1960s and 70s can often be modified to provide 15% to 20% more collecting surface without increasing the footprint of the unit. The size of European design precipitators can be increased 30% and more.

Other performance improvement strategies include:

  • Increasing the width of the gas passages and replacing weighted wire type electrodes with rigid discharge electrodes will improve the reliability of the unit. The precipitator performance will also be improved. Hamon Research-Cottrell has developed and installed pipe and spike electrodes designed to provide the corona generating characteristics needed for improved performance with out the replacement of the existing transformer-rectifier sets.
  • Increasing the number of electrical bus sections will further improve the collection efficiency of the precipitator.
  • Decreasing the amount of collecting surface that is served by each rapper.

Precipitator Collection efficiency:
Ep = 1-e-RB
R = Performance constant
B = Bus sections

Electrostatic Precipitator relative effective migration velocity vs. Gas passage spacing

Electrostatic Precipitator relative effective migration velocity vs. Gas passage spacing

Electrostatic Precipitator Effective migration velocity vs. collecting surface area

Electrostatic Precipitator Effective migration velocity vs. collecting surface area

Electrostatic Precipitator Collection efficiency vs. # of bus sections per 100,000 cfm

Electrostatic Precipitator Collection efficiency vs. # of bus sections per 100,000 cfm

The "G" Opzel™ collecting plate incorporates Hamon Research-Cottrell's traditional Optimum Precipitation Zone ELectrode design, which provides quiescent zones to aide particulate collection and reduce re-entrainment. Plates are sheet steel roll-formed into panel plates that are shop welded together into assemblies.

The plate's structural integrity is fortified by the addition of rolled tube stiffeners at the top and bottom to make the plate more dynamically responsive to rapping. The mounting pad design is a hyperbolic transition section, which serves to gradually and efficiently introduce the rapping energy from the mounting pad into the collecting surface.

The "G" Opzel™ is constructed with a heavy gauge rolled top stiffener. The stiffener serves both to support the plate, and to provide a reliable connection to the top end plate. The "G" Opzel™ has only heavy gauge to heavy gauge welded plate at its support connection virtually eliminating failure/cracking that occurred in earlier designs and the designs of others. The "G" Opzel™ has both top and bottom stiffeners to provide straightness from leading to trailing edges. In addition, vertical straightness is provided by vertical stiffening baffles with overall section width of 4" (Note that these baffles provide electrical and gas flow quiescence functions as well). All panels of the plate are welded together to prevent manufacturing or operational twisting of panels off of the collecting plate centerline.

Another key element contributing to the successful operational record of the "G" Opzel™ collecting plate is the responsiveness of the plate to rapping. The "G" Opzel™ is constructed from panels which are attached eccentrically to each other, rather than having one continuous center sheet.

This eccentric assembly causes the transfer of rapping energy from one panel to another to be perpendicular to the collecting plate surface. The g-level accelerations normal to the collecting plate surface are greatly enhanced by this construction. Studies have shown that approximately one half as much rapping energy is required to obtain a specific acceleration level with the "G" Opzel™, than is required with the continuous sheet designs (Typically called the "E" Opzel design in the ESP industry). Thus the rapping intensities that the plates are subjected to in order to obtain adequate cleaning, is greatly reduced. This also contributes to a longer life. To maintain proper clearances, scalloped spacer bars are supplied at the leading and trailing edge of the collecting plates at the bottom and also in the middle of the plate at the top and bottom. Whether you are refurbishing your ESP to improve efficiency in the short-term or would like to increase its long-term performance, our "G" Opzel™ collector plates will prove to be the collector plate best suited to your system requirements.

In addition to standard replacement discharge electrodes for all earlier Research-Cottrell and Buell/GEESI precipitators, Hamon Research-Cottrell can supply custom Discharge Electrodes to me your exact specifications.

Rigid Discharge Electrodes have replaced wire discharge electrodes in modern precipitators. Innovations developed for various Pipe and Spike electrodes may provide improved performance and reliability if the electrodes need replacement.

Pipe & Spike discharge electrodes are formed from 2" diameter, 16 gauge tubing. Each discharge electrode is attached to the high voltage support frame by a single high strength bolted connection. The individual discharge electrodes are bolted at the bottom through a lower steadying frame. The entire assembly is supported from the roof of the precipitator through a welded high voltage structure. To facilitate ease of construction, each electrode is allowed to hang freely from its support channel and the entire assembly is then aligned to the collecting surfaces prior to tightening the bolted connection. The electrode is virtually maintenance free and is resilient to operational upsets.

The penthouse or insulator compartment pressurization system (commonly called a Seal Air System) is a vital operating link in your electrostatic precipitator. Its function is to continually maintain a pressure in the Penthouse (or Insulator compartments) that is higher than the operating pressure of the precipitator. This prevents the accumulation of dust and moisture on the H.V. support bushings and rapper insulators. If an accumulation of dust and moisture does occur on the H.V. support bushings, they will lose their insulating quality and short out the bus section.

Hamon Research-Cottrell strongly recommends that the pressurization fans, heaters, dampers, filters and controls be inspected regularly to prevent unnecessary down time. If routine inspections identify accumulation on the insulators, an evaluation of the seal air system may be in order.