Steam air preheater for maintaining the flue gas temperature ent

Details Steam air preheater for maintaining the flue gas temperature ent Steam air preheater for maintaining the flue gas temperature ent

1978-11-15

1980-06-03

Yuen, Henry C.

Liquid heaters and vaporizers

Plants

Feed water heaters

122DIG1, 122DIG2, 110304, F22B 3300

Patent

active

042056306

ABSTRACT:
In a pulverized fuel-fired steam generator, a steam air heater is disposed in the air inlet duct to the main air heater. Steam from an auxiliary in-plant source or from the boiler itself is passed through the steam air heater thereby increasing the temperature of the air entering the main air heater. The flow rate of steam passed through the steam air heater is regulated to maintain the flue gas temperature entering dust collection equipment located in the flue gas stream downstream of the main air heater above the dew point of water vapor and the condensation point of sulfuric acid during start-up and low load operations.

REFERENCES:
patent: 2511647 (1950-06-01), Marshall
patent: 3126945 (1964-03-01), Kuhner
patent: 3148665 (1964-09-01), Switzer, Jr.
patent: 3765377 (1973-10-01), Freiday
patent: 3835650 (1974-09-01), Chesnejef
patent: 3938934 (1976-02-01), Frondorf
patent: 4149453 (1979-04-01), Reed

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