Smart Elbow® prevents magnesium oxide leakage at coal-fired generating plant
As featured on Today's Environment on the Discovery Channel, and in the September '95 issue of Powder & Bulk Engineering.
PECO Energy Company's Eddystone Generating Plant, Philadelphia, PA area
In order to meet Federal emissions standards, a magnesium oxide based scrubbing process is used to remove sulfur dioxide from the coal-fired plant's exhaust. The MgO powder is pneumatically conveyed from storage silos to a mixer where it is mixed with water and then sprayed into the plant's exhaust stacks. It combines with sulfur and other pollutants, resulting in an MgSO3 slurry, which is then eventually processed to H2SO4 and MgO which can be recycled and used again. Whenever the generating plant is in operation, the MgO system must also be running in order to maintain sulfur dioxide emissions below mandated levels.
The 'Hole Process'
At the Eddystone facility, standard type 316L stainless pipe elbows frequently wore out, creating a wide range of costly problems. The elbows were components of a three-inch line that relieves system pressure, venting the rotary airlock at the base of the silos, and returning excess product to the top of the silos, approximately 90 feet in the air. This vent/return line operates at 9 PSI, and the leaks were occurring at the backs of both the bottom and top elbows.
When leaks occurred approximately every four to six months, a cloud of MgO dust was released both inside and outside the plant, which created internal and external plant clean-up expense, and involved EPA regulatory concerns. When leaks occurred in the elbows located at the tops of the silos, repairs were made by scaffolding down from the top of the silo to the worn elbow, replacing it, then removing the scaffolding. Engineer Gavin Heckler estimates that each repair cost approximately $4,000 in terms of labor alone. Due to safety concerns, OSHA wanted a fixed platform built at the top of the silos if frequent repairs were going to be required.
The Smart Solution
Six 3-inch carbon steel HammerTek Smart Elbows replaced the standard stainless elbows, providing the advantage of flange rather than weldment installation. According to Heckler, the standard stainless elbows lasted about four months if the MgO systems were operating at full capacity, 24 hours per day. Under similar conditions, '...the HammerTek elbows have been installed for one and one-half years and are still functioning fine. We've installed them in a second silo vent system.'
Smart Elbows rely on deflection, not impact, to change flow direction, thereby eliminating the impact-related problems associated with virtually every other conveying elbow design. At system start-up, a gently rotating ball of suspended material forms in the patented vortice chamber of the Smart Elbow. As the main flow of material passes this ball, it is 'deflected' through the desired change of direction without impact, friction or wear to the elbow's interior surfaces.
Substantial Environmental Impacts
HammerTek Smart Elbows can save your company time, expense and reduce regulatory paperwork by not failing in the first place. Truly an intelligent 'ounce-of-prevention' for conveying systems where any incidence of sweep elbow failure has environmentally sensitive consequences.
Fact: The patented Smart Elbow design provides maximum environmental protection by eliminating elbow wear due to abrasive impact and friction.
Fact: The Smart Elbow eliminates/reduces: plugging, surging, turbulence, noise, product degradation, and streamer formation.
HammerTek Smart Elbows for environmentally sensitive, abrasive, turbulent, sticky or tricky material conveying...
- Reliable delivery
- Competent technical support
- 60/120 day free trial offer on normally stocked items
- 45° and 90°
- Socket Weld and Flanged
- Cast Iron
- Carbon Steel
- Stainless Steel 304 and 316
- HammerLast® Series 300 and 400
- Alloys and coatings available to your specifications
Well into its second decade of operation, HammerTek Corporation has established a solid reputation as an innovative U.S. manufacturer of 'problem-solving' conveying elbows. The design and flow characteristics of the Smart Elbow are patented in the U.S. and 15 other countries.
U.S. distribution is conducted through a nationwide network of manufacturers representatives. Canadian distribution is conducted through Correpro Ltd. Worldwide distribution is conducted under license agreements with Gericke G.m.b.H., Switzerland; Jenkins of Retford Ltd., U.K.; Ledger Engineering Pty., Australia; and Yamamoto Industries, Japan.