Required germination equipment

Conventional Rectangular Germination Vessel

  • The illustration depicts a standard rectangular germination vessel.

  • Required equipment is essential regardless of:

    • Batch size

    • Germination cycle

    • Vessel configuration

Importance of the Perforated Malting Floor

  • The perforated malting floor is the core of pneumatic malting, established in 1873.

  • Facilitates airflow through the germinating grain.

Functions of Airflow

  • Temperature Control: Regulates germination temperature throughout the grain bed.

  • Oxygen Supply: Continuously provides oxygen necessary for the germination process.

  • Carbon Dioxide Removal: Eliminates carbon dioxide produced by the grain, ensuring healthy growth.

Even Airflow Distribution

  • Resistance in the grain bed is crucial for achieving uniform airflow.

  • Key Parameters for Even Airflow:

    • Uniform grain bed from end to end and side to side.

    • Positive pressure on the inlet side of the grain bed.

  • Any failure in these parameters can result in uneven airflow and local germination failures.

Humidity and Moisture Control

  • Germination requires sufficient moisture, but airflow can dry out the grain bed.

  • To maintain high humidity, germination vessels are equipped with:

    • Humidification Spray Deck: Ensures moisture is maintained in the airflow.

    • Temperature Control: Utilizes spray deck water to regulate malting temperatures.

    • Watering Spray Bar: Allows for additional watering during grain turning.

Airflow Management in Germination

  • Highlighted components in airflow system include:

    • Fresh air inlet

    • Exhaust air outlet

    • Return air louvers

  • Temperature control requirements exceed oxygen supply and carbon dioxide removal needs, enabling air reuse.

Reuse of Return Air

  • The value in return air comes from prior investment in:

    • Heating

    • Cooling

    • Humidifying

  • Up to 50-70% of return air can be reused in winter and summer as long as CO2 levels remain manageable.

  • Care must be taken to prevent CO2 accumulation from stunting growth.

Role of the Turning Machine

  • The turning machine (Saladin machine) is pivotal for pneumatic malting.

  • Prevents occlusion of airflow by growing rootlets, which could disrupt germination control.

  • Regular Turning Requirement:

    • Typical operation is every eight hours, ensuring optimal conditions for germination.