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Heat exchanger and heat exchange process

一种热交换器、耐热的技术，应用在热交换设备、间接换热器、换热器类型等方向，能够解决过热湿蒸汽应力腐蚀等问题

Inactive Publication Date: 2006-01-04
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal dusting corrosion must be taken into account when superheaters are used as synthesis gas coolers
[0005] Another harsh condition to consider in superheater design is the potential for stress corrosion of superheated wet steam

Method used

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

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] The present invention relates to a heat exchanger which is used as a superheater and which is designed to avoid the occurrence of Metal dusting and stress corrosion. The heat exchanger is adapted to exchange heat between the first and second fluids. Examples of said fluids are steam (first fluid) and synthesis gas (second fluid). In the heat exchanger, the hot synthesis gas from the steam reforming reactor is cooled by steam.

[0016] The heat exchanger is a U-tube type with thick tube sheets. A plurality of U-shaped tubes for conveying the first fluid are arranged in parallel and spaced apart from the intermediate inlet and the peripheral outlet of the second fluid. Heat transfer on the shell side is enhanced by means of discs and ring baffles. A plurality of tubes are arranged in tube bundles, each tube bundle corresponding to a specific heating zone.

[0017] The first fluid, for example steam, flows in the tubes, the second fluid, for example synthesis gas, flo...

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PUM

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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

technical field [0001] The invention relates to a heat exchanger and a heat exchange method using the heat exchanger. In particular, the present invention relates to a heat exchanger for use as a steam superheater with improved resistance to metal dusting and stress corrosion. Background technique [0002] Steam reforming is generally an essential step in the production of CO-enriched syngas. In this reaction, methane and steam are thus reformed by supplying heat to a gas mixture formed from hydrogen, carbon dioxide, carbon monoxide, steam and methane. The temperature of the reformed synthesis gas is typically between 750°C and 1050°C. The hot synthesis gas is then cooled in the boiler or in the boiler and superheater. [0003] One of the harsh conditions associated with coolers for reformed gas is corrosion known as metal dusting. Metal dusting is the deteriorating attack of carbon monoxide-rich gases on alloys formed of iron and / or nickel. A fundamental reaction cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G3/00F22G1/00F28D7/00F28D7/06F28D7/16F28F9/22F28F21/08
CPCF28F21/082F28F9/22F28D7/1676F28D7/06F28D7/00F28D7/10F28F21/00
Inventor H·O·斯塔尔
Owner HALDOR TOPSOE AS
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