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    These compact dryers (typically 2.5m×8m) are designed for low-capacity operations. A 100MW plant in Vietnam installed a modular drum dryer that processes 60 tons of sludge daily, reducing moisture from 82% to 18%. The dried sludge (called “sludge briquettes”) is mixed with coal at a 1:5 ratio, cutting coal purchases by 15%—saving the plant $80,000 monthly. Unlike large dryers, the modular unit runs on the plant’s existing flue gas, eliminating the need for additional fuel sources.

    For plants in remote areas, maintenance is a key concern. These dryers use simplified components: manual moisture controls (no expensive IoT systems) and easily replaceable rubber liners that local technicians can install in 4 hours. A plant in rural Indonesia reported 95% uptime in its first year, compared to 70% for a imported large dryer that required specialized parts.

    As small coal plants face pressure to reduce waste, these compact dryers offer a pragmatic path to sustainability—without the high upfront costs of large-scale upgrades.