A recuperative gas fired forge furnace
To overcome the heat deficit and oxidizing atmosphere problems and to reduce fuel consumption, a small gas forge furnace has been developed which incorporates recuperative heating; as the combustion air is drawn into the furnace it is preheated by passing it through a simple heat exchanger which is heated by the exhaust gases from the furnace. This recuperative heating principle is the same used by blast and open hearth furnaces but they typically employ complex heat exchangers, and extensive blowers and valving to direct the flow of the intake and exhaust gases. In the furnace described in this article a chimney is provided at the rear of the furnace and the air intake ducts pass through the chimney before reaching the venturi where the fuel gas is injected. Thermocouples were place in the air intake ducts and the temperature of the recuperated air was 1000 F. Based on data in the Mechanical Engineers Handbook (Industrial Heating Furnaces) fuel savings are directly related to the temperature of the preheated air. The theoretical saving in fuel with 800 F. combustion air is about 19%. The furnace is very quiet, since no blowers are used and the venturi is located in the center of a long tube. To control the furnace atmosphere and to help reduce heat loss, a close fitting swing away door has been incorporated, and the entire furnace is insulated with lightweight high performance ceramic insulation. The resulting furnace easily achieves forge welding temperatures, has an oxygen depleted atmosphere and has proven to be very effective and capable for small machine and hand forging operations. 6 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6083440
- Report Number(s):
- SAND-89-1385C; CONF-8906143-1; ON: DE89013448
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320303 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
BLOWERS
CERAMICS
CHIMNEYS
EFFICIENCY
ENERGY CONSUMPTION
ENERGY EFFICIENCY
ENERGY LOSSES
EXHAUST SYSTEMS
FABRICATION
FORGING
FUEL CONSUMPTION
FURNACES
GAS FURNACES
HEAT EXCHANGERS
HEAT LOSSES
LOSSES
MATERIALS WORKING
THERMAL INSULATION