Characteristics Of Multiplehearth Systems

The following statements summarize the characteristics of multiple-hearth systems.

1. They generally handle sludges containing up to 75% moisture without auxiliary fuel.

2. They can incinerate or pyrolyze a variety of sludge materials, individually or in combination, including diffi-cult-to-handle materials such as scum, grease, and ground refuse.

3. They can be used (or retrofitted) as a reclamation furnace for chemicals such as lime in combination with sludge or separately.

4. They can operate continuously or intermittently over a range of sludge feed capacities because the excess air for combustion and exit-gas temperatures can vary to suit conditions.

5. They have a long life and low maintenance costs over decades of operation.

6. They have a single feed point without a pressure feed requirement.

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