Heat exchange – Casing or tank enclosed conduit assembly – Conduit coiled within casing
Reexamination Certificate
1999-01-25
2001-02-20
Flanigan, Allen (Department: 3744)
Heat exchange
Casing or tank enclosed conduit assembly
Conduit coiled within casing
C165S920000
Reexamination Certificate
active
06189605
ABSTRACT:
Particularly in the case of synthesis gas, which usually has a pressure in the range of 20-60 bar and a temperature in the range of 600-900° C., the rate of gas flow is too high to allow treatment in a typical cooling unit for flue gas. Since the quantity of solid particles such as dust and ash amounts to for instance more than 1% by weight, existing gas coolers can become clogged by fouling and the parts which come into contact with the gas erode and/or corrode easily.
The present invention provides a device for cooling fluid, comprising:
an inlet for infeed of the fluid;
a through-flow space through which the fluid flows;
a discharge for outfeed of the fluid; and
a number of pipes which extend helically in the interior of the through-flow space and the pitch of which is such that the upward angle at least equals the angle of fall of solid particles present in the fluid flow.
Because of the upward angle of the helical round pipe the solid particles will not remain lying thereon and considerably less erosion, corrosion and/or clogging occurs. A saturated flow of steam can have a pressure higher than for instance 110 bar. The device is preferably designed such that the temperatures of the metal lie below 400° C., whereby carbon steel or slightly alloyed steel can be applied. For components which cannot be cooled sufficiently, it is recommended to use Cr (Chromium) and Ni (Nickel) alloys or heat-resistant linings on carbon steel.
The present invention further provides a method wherein the device according to the present invention is applied.
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patent: 3812825 (1974-05-01), Polcer et al.
patent: 4466479 (1984-08-01), MacLean
patent: 4687052 (1987-08-01), Fricker
patent: 4803957 (1989-02-01), Premel
patent: 4828802 (1989-05-01), Colvert et al.
patent: 4998583 (1991-03-01), Lahne et al.
patent: 5228505 (1993-07-01), Dempsey
patent: WO89/03723 (1989-05-01), None
patent: 8907022 (1989-08-01), None
Flanigan Allen
Ostrolenk. Faber, Gerb & Soffen, LLP
Standard Fasel-Lentjes B.V.
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