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Heat exchange and heat exchange process

a heat exchange and heat exchange technology, applied in the direction of heat exchange apparatus, heat exchanger types, stationary tubular conduit assemblies, etc., can solve the problems of stress corrosion from wet steam, metal dusting attack on super heaters applied as coolers for synthesis gasses,

Inactive Publication Date: 2010-09-02
STAHL HENRIK OTTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the severe conditions related to coolers for reformed gas is the corrosion known as metal dusting.
However, super heaters when applied as coolers for synthesis gasses have to be considered as subject to metal dusting attack.
Another severe condition to consider in the design of super heaters is the possibility of stress corrosion from the wet steam which is to be superheated.

Method used

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  • Heat exchange and heat exchange process
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  • Heat exchange and heat exchange process

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Embodiment Construction

[0015]The invention concerns a heat exchanger which is useful as a super heater and is designed to avoid metal dusting and stress corrosion by a proper selection of a combination of metal alloys and gas / steam flow through a pre-defined pattern of heat exchange tube bundles. The heat exchanger is suitable for heat exchange between a first and a second fluid. An example of such fluids is steam (first fluid) and synthesis gas (second fluid). The hot synthesis gas from a steam reforming reactor is cooled by steam in the heat exchanger.

[0016]The heat exchanger is of the U-tube type with a thick tube sheet. A plurality of U-tubes for transfer of the first fluid are arranged parallel and spaced apart with a central inlet and a peripheral outlet for the second fluid. The shell side heat exchange is enhanced by disc and doughnut baffles. The plurality of tubes is arranged in tube bundies, each tube bundle corresponding to a particular heating zone.

[0017]The first fluid, for instance steam, f...

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Abstract

Heat exchange process comprising sequential cooling a first fluid by indirect heat exchange with a second fluid and comprising the following steps:introducing the first fluid sequentially into at least two concentric U-tube bundles defining at least a first heating zone and a second heating zone respectively,introducing a second fluid onto the shell side of the U-tube bundles, each heating zone partially separated from the other by a wall, the first heating zone being a colder zone and the second heating zone being a hotter zone, the tube bundle of the first colder heating zone being made of a low alloy steel and the tube bundle of the second hotter heating zone being made of a temperature and corrosion resistant alloy,withdrawing the cooled second fluid and the heated first fluid.The invention also concerns a heat exchanger for use in the above process.

Description

[0001]The invention concerns a heat exchanger and a process for heat exchange in which the heat exchanger is applicable. In particular the invention relates to a heat exchanger useful as a steam super heater and having improved resistance to metal dusting and stress corrosion.BACKGROUND OF THE INVENTION[0002]Steam reforming is most often an essential step in the production of carbon monoxide rich synthesis gas. In this reaction methane and steam is hereby converted under supply of heat to a gas composition comprising hydrogen, carbon dioxide, carbon monoxide, steam and methane. The temperature of the synthesis gas after reforming is most often between 750° C. and 1050° C. The hot synthesis gas is subsequently cooled in a boiler or in a boiler and a super heater.[0003]One of the severe conditions related to coolers for reformed gas is the corrosion known as metal dusting. Metal dusting is a deteriorating attack of the carbon monoxide rich gas on alloys based on iron and / or nickel. A ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28F7/00F28D7/00F28D7/06F28D7/16F28F9/22F28F21/08
CPCF28D7/06F28F21/082F28F9/22F28D7/1676F28D7/00F28D7/10F28F21/00
Inventor STAHL, HENRIK OTTO
Owner STAHL HENRIK OTTO