Las mejoras convierten a OPPD en líder en seguridad de PRB

24 de junio de 2013

Material handling upgrades at the Omaha Public Power District (OPPD) have been so successful that the PRB Coal Users’ Group recently announced OPPD as recipient of the Plant of the Year Award. The PRB Coal Users Group recognizes a power plant each year for innovation and implementation of “best practices and best available technologies.”

OPPD is one of the largest publicly owned electric utilities in the United States, serving more than 350,000 customers in 13 southeast Nebraska counties. 

In the 1980s, as part of its commitment to best environmental stewardship practices, OPPD was converted to burn cleaner, lower sulfur coal from Wyoming’s Powder River Basin (PRB). Constructed over 50 years ago, the five-unit plant was initially designed to burn Midwestern produced high sulfur coal.

Though now cleaner, during the initial conversion process, the plant was not fully optimized to address the particular dust mitigation techniques necessary when handling PRB coal. Adjusting material handling flow to the characteristics of PRB coal and addressing its unique safety hazards led OPPD to seek Martin Engineering’s expertise.

OPPD was using a conventional, dated materials handling system. Martin, who already had a long service history with OPPD, was asked to conduct a safety and materials handling audit specifically addressing fugitive dust and overall coal dust control.

The project was completed over four phases and included transfer point upgrades to twelve belts throughout the plant and installation of insertable air cleaners to 10 load zones. Belt support cradles were installed under the drop chutes to absorb impact and stabilize the belt lines and prevent spillage. Martin® Air Cleaners were installed on the load zones to further reduce the escape of fugitive material. Additionally, Martin installed a Dust Fighter™ Foam system to further reduce fugitive dust.

Overall, the biggest dust control improvement has been the rebuilding of the coal transfer points to contain that dust. “We used to have lots of dust and spillage. But now that almost all of the transfer points have been rebuilt, it’s a night and day difference,” said Kirk Estee, P.E. Material Handling Supervisor at OPPD.

To help ensure that all the transfer points are working properly, Martin comes to the plant monthly, walks through the belt lines and transfer points. Martin also keeps a parts inventory on site that they withdraw from as needed. If a new seal, belt cleaner or other item is needed, it is close at hand.

If you'd like to view more photos of this project, please click here.


OPPD is one of the largest publicly owned electric utilities in the United States, located along the Missouri River.

Martin Engineering upgraded four transfer points and twelve belts throughout the plant.

Insertable Air Cleaners were added to 10 load zones to further reduce the escape of fugitive material.

Colector de Polvo Air Cleaner

El colector de polvo Martin® se instala sobre la transferencia del transportador para capturar el polvo en suspensión y recolectar las partículas en el filtro de espuma. El pulso en reversa devuelve el polvo al flujo de carga principal.

Características y beneficios:

  • Los filtros compactos funcionan mejor y duran más al mismo tiempo que consumen menos energía que las bolsas de filtrado convencionales.
  • El tamaño pequeño de los filtros mejorados permite hacer una recolección efectiva con menos movimiento de aire y ventiladores más pequeños, lo que reduce los costos de energía.
  • Small unit size allows use of Air Cleaner in areas where space limitations complicates installation of other collection systems.
  • El pulso en reversa limpia los filtros; el reemplazo de los elementos compactos de filtrado es un procedimiento simple que se realiza sin herramientas desde el lado limpio del recolector.
  • Elimina muchos de los problemas de los sistemas de recolección centrales con “filtros de manga”, incluidos los ductos largos, los gabinetes grandes, el alto consumo de energía y las tareas de mantenimiento difíciles.
  • El modelo estándar es adecuado para utilizarse con materiales no explosivos en ubicaciones que no sean peligrosas.
  • Modelo opcional disponible para utilizarse con materiales explosivos en ubicaciones peligrosas.
  • Se puede utilizar como sistema recolector de polvo independiente o como complemento de los sistemas de recolección de polvo centrales existentes.

Cleanscrape.Com is now Martin Engineering

Effective October 15, 2016, CleanScrape GmbH was acquired by Martin Engineering. Martin is known for being an innovative leader in belt cleaning, among many other areas. The CleanScrape belt cleaner will continue to be manufactured with the highest quality assurance backed by the same great service. Product quality and customer relations will remain our priority.