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Method for improving CO2 recovery rate of contact-process furnace in sulfuric acid factory

A carbon dioxide, sulfuric acid plant technology, applied in chemical instruments and methods, sulfur compounds, carbon compounds, etc., can solve problems such as low concentration

Inactive Publication Date: 2007-01-31
BOC GRP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its low concentration, this carbon dioxide is generally not recovered from the purged gas

Method used

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  • Method for improving CO2 recovery rate of contact-process furnace in sulfuric acid factory

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Embodiment Construction

[0007] The invention relates to a method for improving the recovery rate of carbon dioxide in a furnace of a sulfuric acid plant. The method includes injecting oxygen into the furnace described above. It has now been found that the concentration of carbon dioxide in the flue gas can be increased by increasing the oxygen content above the air normally fed to the sulfuric acid plant and by reducing the nitrogen content in the feed gas. The method also keeps the temperature of the catalyst from exceeding a temperature which would damage the catalyst and affect the conversion of sulfur dioxide to sulfur trioxide. Generally, such temperatures are below 2100°F. However, if the refractory material of the reformer is improved to withstand higher temperatures, the above-mentioned temperature can exceed 2100F. The oxygen-enriched stream passed to the sulfuric acid plant furnace should contain at least 60% oxygen by volume. This oxygen-enriched stream may be obtained from any conventi...

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Abstract

The present invention provides for the use of oxygen-enriched gas stream injected into a sulfuric acid plant furnace to increase the yield of carbon dioxide. The increased yield of carbon dioxide can then be recovered, purified and processed such that it can be employed in additional processes such as that in the food industry.

Description

technical field [0001] The invention provides a method for increasing the oxygen content in the furnace of a sulfuric acid production plant. Specifically, the present invention provides a method for increasing the recovery of carbon dioxide in a sulfuric acid plant. Background technique [0002] Sulfuric acid is generally produced by two broad categories of methods, namely the lead chamber method and the contact method. The lead chamber method is generally used to manufacture sulfuric acid for the production of fertilizers. This method produces sulfuric acid at a lower concentration of 62-78%. The contact method produces purer and more concentrated sulfuric acid, but also requires the use of purer raw materials and catalysts. Of the two methods, the lead chamber method is an older method and is no longer used. In the contact method, the purified sulfur dioxide is mixed with air, heated to about 450°C, and passed through a catalyst, and the sulfur dioxide is oxidized to s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/76C01B31/20C01B17/80C01B17/50C01B32/50
CPCC01B17/76C01B31/20C01B17/508C01B32/50
Inventor C·沙阿
Owner BOC GRP INC