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Process for removing contaminants from gas streams

A technology for pollutant and waste gas flow, applied in separation methods, chemical instruments and methods, sulfur compounds, etc., can solve the problem that small-sized equipment is difficult to obtain economic benefits, oxygen-rich conditions cannot be fully realized, and product quality is degraded, etc. question

Active Publication Date: 2013-08-07
LINDE AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the industry still has the following problems to varying degrees: NO X Emissions, acid plume, loss of product quality due to saltpeter and nitrogenous compounds remaining in the sulfuric acid
The potential or benefits of oxygen-enriched conditions will not be fully realized without addressing the issues of higher environmental emissions and increased saltpeter content in the product
figure 1 It shows that due to the long cost recovery period, it is difficult for small-sized equipment to obtain good economic benefits

Method used

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  • Process for removing contaminants from gas streams
  • Process for removing contaminants from gas streams
  • Process for removing contaminants from gas streams

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Embodiment Construction

[0057] Sulfuric acid regeneration (SAR) plants and acid recovery systems on metal ore roasters are slightly modified forms of sulfur-burning sulfuric acid plants. In all three types of equipment, the sulfur source is converted to SO in the process gas 2 . In the first two types of equipment, containing SO 2 streams with particulate matter must be oxidized to SO 3 Wash and dry before. Clean and dry SO containing 2 The stream passes through a series of heat exchangers and V 2 o 5 Catalyst bed, which converts to SO at about 700°C 3 . Typically 3-4 catalyst beds called converters are used. The heat of the process gas stream leaving the last reformer bed passes through a series of cascaded heat exchangers to heat the gas entering the reformer. SO 3 Absorbed by the sulfuric acid absorber to form oleum or 98% sulfuric acid, with some product removed continuously.

[0058] In newer sulfuric acid plants, the off-gas stream from the absorber is heated again through V 2 o 5 ...

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Abstract

The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and production plants. The process gas stream from the waste heat boiler and the candle mist eliminator is contacted with ozone which will react with nitrogen oxide s present in the flue gas.

Description

[0001] This application claims priority to US Provisional Patent Application 60 / 897,003, filed January 23,2007. technical field [0002] The present invention provides a method of removing pollutants from gaseous effluents. More specifically, the present invention provides methods for removing pollutants such as nitrogen oxides from sulfuric acid production process gas streams. Background of the invention [0003] Sulfuric acid is widely used in industrial production. Sulfuric acid is believed to be the world's largest chemical product. Over the past few decades, most of the world's sulfuric acid has been produced by the contact process, which involves the generation of sulfur dioxide-containing gas streams from various sulfur sources. Examples include burning free sulfur, or methods of roasting metal ores, or burning H from industrial processes such as hydrosulfurization of petroleum products 2 S, or simply burning waste containing sulfate or sulfuric acid, or burning sp...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56B01D53/76C01B17/74
CPCY02A50/20Y02P20/129
Inventor N·苏卡S·J·芬勒J·A·埃斯巴齐R·赛斯
Owner LINDE AG