Steam generator

Details Steam generator Steam generator

1996-03-26

1998-07-07

Bennett, Henry A.

Liquid heaters and vaporizers

Industrial

Waste heat

122 1C, 122 4D, F22D 100

Patent

active

057752664

ABSTRACT:
In a steam generator (1) having, downstream of the fire-box (7), a radiant part and, subsequent thereto, a convective part, the latter essentially comprising, connected in series on the flue-gas side, contact heat exchanger (18), superheater (9) and economizer (2), the steam generator (1) being used in a circuit for the direct selective catalytic reduction (SCR process) of the nitrogen oxides in the flue gas (19), the economizer (2) consists of two parts. An NOx catalyst (5) is arranged between the two parts (2a, 2b), the economizer (2a) arranged upstream of the catalyst (5) in the direction of flow of the gas (19) being subdivided into at least two sections (10a, 10b), through which, on the one hand, the flow passes in series on the flue-gas side and, on the other hand, the working medium to be heated flows in parallel from bottom to top, and at least one section (10a) always being connected via lines (11a, 12) to the drum (13) and the other section(s) (10b) being able to be shut off as desired from the water circulation via lines (11b) which can be shut off.

REFERENCES:
patent: 4160009 (1979-07-01), Hamabe
patent: 4466241 (1984-08-01), Inui et al.
Thome-Kozmiensky, "Thermische Abfallbehandlung", EF-Velang fur Energie--und Um Welttechnik GmbH, (2d Ed. 1994) pp. 555-557.

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