Efficient Dryer Ventilation with Sly’s Custom Collector
A limestone supplier sought to meet air pollution emission limits, while efficiently and effectively optimizing their production process. The firm needed a way to collect and recycle fines generated from a fluid bed dryer released during the drying and cooling process.
The customer worked with a sales representative from Sly, LLC, through multiple meetings to review the dust collector and dryer purchase. The representative could effectively hear the customer’s issues and help accordingly, as he had technical expertise in both products.
After meeting with the customer, Sly selected an STJ-4717-10 Tubejet collector for their manufacturing facility. The collector operates at a 5.2:1 air-to-cloth ratio, and installation requires only one air outlet connection to the fan on the collector’s end.
Because the preferred location of the outlet duct exceeded the space available on the collector, Sly chose to customize its clean air plenum with a taller design and a larger outlet. These modifications were able to accommodate a duct size that could manage the large airflow of 62,000 ACFM.
The inlet loading to the collector from the dryer was six tons per hour. To reduce abrasion at the inlet, both air inlets were sized for a velocity below 3,000 FPM, and the internal inlet diffuser was fabricated of abrasion-resistant steel. Because the inlet loadings may vary, Sly provided controls to either clean continuously or only when the pressure drop demands a filter bag cleaning. This method saves on compressed air usage and extends the life of the filter bags. It is available on all Sly dust collectors.
Finally, because the collector is so large, a trough hopper, screw conveyer, and rotary valve were furnished to provide a single-point discharge for the collected product. This product was then returned to the limestone processing cycle. To monitor filter bag performance, a differential pressure gauge is included in the unit to track pressure drop, and a detector designed to check for broken bags was installed in the outlet duct to indicate an increase in emissions caused by bag wear or other upset conditions.
The dust collector was conservatively sized to process materials efficiently while still meeting air pollution control standards. The filter bag media chosen was cost effective and long-lasting while still efficiently collecting dust.
The bags in Sly’s Tubejet collector operated for 22 total months of continuous use before a bag change was needed. The collector itself has been running smoothly since the summer of 2013 with excellent results.
Sly, LLC manufactures a full line of industrial fabric filter dust collectors and baghouses, cartridge collectors, wet scrubbers for particulate collection, retractable dustless bulk loading spouts, and aftermarket parts for their own and competitors’ dust collectors. Sly has been a privately owned company since 1874 and manufactures equipment in their own facility located in Mathiston, MS. Sly specializes in customized applications solutions employing a variety of technologies to meet any user’s specific requirements. All products are engineered and fabricated to order.