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Removal of nox from gaseous effluent

An exhaust, gaseous technology, applied in the field of removing NOx from gaseous exhaust, and removing NOx from gaseous exhaust

Active Publication Date: 2022-07-26
YARA INT ASA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been observed that the addition of ozone to exhaust gases is not sufficient to sufficiently reduce NO in gaseous effluents from fertilizer production x emission

Method used

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  • Removal of nox from gaseous effluent
  • Removal of nox from gaseous effluent
  • Removal of nox from gaseous effluent

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Embodiment Construction

[0038] As used herein below, the singular forms "a", "an" and "the" include both singular and plural referents unless the context clearly dictates otherwise.

[0039] The term "comprise / comprises" as used below is synonymous with "including / include" or "contain / contains" and is inclusive or open ended and does not exclude additional References to parts, elements or method steps. When the description refers to a product or method that "comprises" a particular feature, part or step, it refers to the possibility that other features, parts or steps may also exist, but may also be Refers to embodiments that contain only the listed features, parts or steps.

[0040] Numerical enumeration by means of numerical ranges includes all values ​​and fractions within those ranges and the endpoints cited.

[0041]The term "about" used in reference to a measurable value such as a parameter, quantity, period of time, etc. is intended to include + / - 10% or less of the specified value, preferabl...

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Abstract

The present application relates to a method for reducing NOx in a gaseous effluent produced in the production of fertilizers comprising the acid hydrolysis of phosphate ores in the presence of urea, wherein the NOx composition of the gaseous effluent produced is 70 mol% to 100 mol% NO 2 and 0 to 30 mol % NO, the method comprising the steps of: a) contacting the gaseous effluent with ozone for 0.5 to 15 seconds, thereby providing a resulting gas mixture in which NO and NO are present in NOx 2 being oxidized to high-value nitrogen oxides; and b) removing high-value nitrogen oxides from the resulting gas mixture; wherein urea is 0.25% by weight based on the weight of the phosphate ore during the acid hydrolysis of the phosphate ore The following amounts are present; and ozone is added to the gaseous effluent at an ozone / NOx ratio in the range of 0.5 to 1.4.

Description

technical field [0001] The present application relates to the technical field of removing NOx from gaseous effluents, more particularly from gaseous effluents produced in fertilizer production. Background technique [0002] NO is formed as an unwanted by-product during fertilizer production x gas. Due to NO x Can lead to acid rain formation, so several solutions have been offered to reduce NOx production in these industrial processes. [0003] Although the addition of urea is known to reduce NO x emission method, but adding urea results in N 2 O emissions increase, while N 2 O is a greenhouse gas and has a far greater impact on global warming than CO 2 . The global warming impact of these gases is represented by the Global Warming Potential or GWP value of each gas, which represents 1 ton of CO 2 How many times does the effect need to be multiplied to have the same effect as 1 ton of said gas, and this is for a time period of 100 years after the gas has been released...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56B01D53/78C05B11/04
CPCC05B11/04B01D53/56B01D53/78B01D2251/104B01D2257/404C05C9/005B01D53/1431B01D53/1456B01D53/346B01D53/76C05B11/06
Inventor 罗伯特斯·路易帕特里夏·基塔莱内·松德
Owner YARA INT ASA