The purpose of a brown stock system is to process the brown stock, and, usually in this order: remove high density trash, break down or remove uncooked wood, and wash black liquor from the brown stock. This module will explain the process steps within a brown stock system, and the various types of equipment which are used to accomplish each operation.
•Describe the purpose of a brown stock system
•Identify and describe the major equipment
•Identify and describe the primary process flows
•Describe the function of a rock trap
•Describe the function of a screen
•Describe the function of a washer
•Differentiate between a fibrilizer and a refiner
•Describe countercurrent washing
•Identify and describe the safety hazards in the brown stock system
