Coffee Roasting – Dealing with Chaff Embers – Local Case Study
Local Case Study
Industry: Food Prcessing
The Client
Club Coffee needed a dust collection system for capturing airborne chaff embers before entering the collection system while maintaining temperature and airflow requirements to ensure a perfect coffee roast.
The Challenge
Roasting coffee involves exposing green coffee beans to high temperatures, triggering chemical reactions that enhance flavours and aromas. During roasting, the beans shed their outer skin, called chaff, which is typically removed through winnowing or sieving to ensure optimal flavour development and to prevent bitterness in brewed coffee.
Managing the removal of chaff is crucial to avoid creating embers, which are small
particles that pose fire hazards and can taint the coffee with undesirable flavours.
To address this, a dust collection system is essential, designed
to prevent embers from reaching the collector while ensuring efficient airflow and temperature control throughout the roasting process. Additionally, incorporating fire and explosion protection measures inside the facility and employing high-efficiency filtration systems can help
maintain air quality, minimize energy consumption, and enhance overall safety during coffee processing.
The Solution
To address this, a dust collection system is essential, designed to prevent embers from reaching the collector while ensuring efficient airflow and temperature control throughout the roasting process.
Additionally, incorporating fire and explosion protection measures inside the facility and employing high-efficiency filtration systems can help
maintain air quality, minimize energy consumption, and enhance overall safety during coffee processing.
The chosen solution involved implementing a high vacuum system. AST installed a TD-573 dust collector on each process side with a capacity of 1,100 CFM to capture and filter the chaff and dust produced during the roasting process. Additionally, the system includes an ember detector
system and an extinguishing system to prevent embers from entering the dust collector. Moreover, it features fire explosion protection and
suppression systems, as well as a VFD control panel and pressure transducers to ensure constant flow, energy efficiency, and prolonged filter
life.
The Equipment
- Two (2) TD-573 dust collectors.
- Two (2) MD-12 airlock valves at the dust collector hopper outlet.
- Two (2) NT55202 Multistage centrifugal air exhausters, 20 HP.
- Two (2) High performance silencers.
- Two (2) AST-CP-20HP-575V control panels.
- Two (2) FireFly spark detection systems and accessories.
- Two (2) Fike explosion suppression systems.
- Two (2) FireTrace CO2 fire protection assemblies.
- Sixteen (16) MD-8 airlock valves to isolate the roasters.
Installation Images
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