| 摘要 |
This invention provides a method of removing heat from the process gas in a sulfuric acid plant having interpass and final absorption towers by indirect heat exchange with a liquid without condensing acidic vapors from said process gas. The method comprises installing first and second economizers, the second economizer having first and second sections for liquid flow. The process gas flow through the first economizer before passing through the interpass absorption tower and through the second economizer before passing through the final absorption tower. A liquid flows through the first and second economizers for indirect heat exchange with the process gas, the liquid passing sequentially through the second section of the second economizer, the first economizer, and the first section of the second economizer. The second section of the second economizer is used to preheat the liquid before the liquid enters the first economizer to prevent any portion of the first economizer from cooling to the dew point of the vapors, thus preventing condensation of vapor, and to increase the heat removed from the process gas.
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