Liquid heaters and vaporizers – Feed heaters
Patent
1982-02-10
1983-07-19
Yuen, Henry C.
Liquid heaters and vaporizers
Feed heaters
122414, 122 1C, 122488, 122489, F22D 100
Patent
active
043938167
ABSTRACT:
A thermodynamic method is described and claimed for improving the quality of wet steam produced by conventional and once through type boilers. Moisture entrained with such steam is first separated in a steam-water separation vessel. The separated moisture is thereafter vaporized by pressure reduction and flashed to form lower pressure steam and condensate containing dissolved solids. The condensate is utilized to preheat fresh boiler feedwater. The lower pressure steam is condensed and supplements the boiler feedwater to form a hotter combined net feedwater stream containing reduced quantities of dissolved solids. Practice of the method, in association with commercially available boilers producing saturated to moderately superheated steam at temperatures of up to about 970.degree. F. and steam pressures of up to about 2,900 psig, has resulted in increases in the quality of the steam produced from about 70% to about 99% (substantially dry steam). Further, the method includes heating of the fresh boiler feedwater from ambient temperature to about 200.degree. F. without the utilization of additional fuel by the boiler system. Also, less fresh boiler feedwater is required to produce the same net process heating value of the steam product.
REFERENCES:
patent: 2908255 (1959-10-01), Michel
patent: 4249486 (1981-02-01), Potschnik
patent: 4258668 (1981-03-01), Bekedam
patent: 4261298 (1981-04-01), McDonald et al.
patent: 4318366 (1982-03-01), Tompkins
Junkins Philip D.
Yuen Henry C.
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