Instructions 4343-16 Page 2
6. Continue ramping furnace temperature at a rate of 100°F per hour until maximum operating temperature has been achieved. If any steaming occurs during this process, hold the temperature constant until steaming dissipates. 7. If the furnace will be allowed to cool prior to being put into service, hold maximum temperature until equilibrium is reached through the burner lining. The initial cool-down should be at a rate no faster than twice the fastest heat up rate. DRY-OUT USING TWINBED® II BURNERS 1. Begin the simultaneous dryout of the furnace and burners by cycling the TwinBed II burners cooling air and combus- tion air at 20% of the burner’s rated air flow capacity and lighting the pilots. CAUTION! Standards compliant functioning of the Flame Detection System can be compromised if the pilot system is not configured and adjusted strictly in accordance with the information outlined in Sheet 4343-3. 2. If the refractories used in the furnace construction may be expected to egress salts or condensable compounds during the heatup, be conscious of the fact that exhausting through the TwinBed II burners may capture these compounds in the beds and exhaust piping, leading to plugging and/or corrosion, necessitating cleaning of the regenerators and possibly the piping after dryout is complete. 3. Adjust the combination of the TwinBed II exhaust and the resistance on the furnace stack to maintain the desired furnace pressure (typically positive) without overheating the TwinBed II exhaust components.
4. Continue cycling of the burners for a minimum of four hours and then add the minimum amount of main gas at which the burners will stay alight with flame detection ac- tive. 5. After a further four hours of cycling at this rate, maximize the burner air flow and readjust the fuel to the new mini- mum rate at which the burners will stay alight with flame detection active in order that the burners generate the larg- est possible volume of "warm" air. 6. Pressurize furnace and regulate pressure by manually ad- justing exhaust control valve. 7. Monitor exhaust gas temperature to ensure that exhaust temperature is not exceeding the limits of the critical refrac- tory components within the furnace, the exhaust blower, regenerator plenum and exhaust piping. 8. Ramp up the temperature by gradually increasing the gas flow to maintain a maximum rate of 100°F per hour until maximum operating temperature has been achieved. If any steaming occurs from the burner structure during this process, hold the temperature constant until steaming dis- sipates. 9. If the furnace will be allowed to cool prior to being put into service, hold maximum temperature until equilibrium is reached through the burner lining. The initial cool-down should be at a rate no faster than twice the fastest heat-up rate.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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