Method and apparatus for recovering heat in product dehydration system

Patent · Tue Aug 31 04:00:00 EDT 1982

OSTI ID:6465746

Ronning, R L

An improved, fuel efficient crop drying system and method is disclosed which makes use of the waste heat from a primary rotary drum dryer in order to predry the crop in a two-pass, indirect heat exchange dryer. The predryer and primary dryer are coupled in a pneumatic (Negative pressure) conduit loop so that crop is conveyed in serial order through the dryers. The predryer includes respective, adjacent, two-pass air and crop paths disposed within a tubular shell, and the entire predryer is axially rotated during operation thereof. The ultimate volumetric air discharge from the system is significantly reduced as compared with conventional rotary dryers, and the saturated wet scrubbing which occurs in the predryer displaces a high percentage of particulate matter from the gaseous discharge to the water discharge, thereby reducing atmospheric pollution.

• Assignee: Ronning Engr Co Inc
• Patent Number(s): US 4346523
• OSTI ID: 6465746
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320304* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization
AGRICULTURE
AIR
CROPS
DEHYDRATION
DRYERS
ENERGY RECOVERY
FLUIDS
GASES
HEAT RECOVERY
INDUSTRY
RECOVERY
SCRUBBING
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION