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Method for calcination of a material with low nox emissions

A calcination and fuel technology, applied in the combustion method, combustion air/fuel supply, burner, etc., can solve problems such as mixing of unburned materials

Inactive Publication Date: 2008-07-30
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This particular arrangement makes it possible to maintain oxidizing conditions above the charge and transfer more energy there, but does not allow all unburned material to mix properly

Method used

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  • Method for calcination of a material with low nox emissions
  • Method for calcination of a material with low nox emissions
  • Method for calcination of a material with low nox emissions

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Experimental program
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Embodiment Construction

[0049] 1 and 2 each schematically show the arrangement of two inert gas lances 2 and an oxygen or oxygen-enriched gas lance 3 around the burner 1 at the outlet of the rotary calciner. The furnace 5 is slightly inclined so that the clinker 6 can be discharged. The burner 1 is supplied with a flow a of fuel and primary air. The flame F is obtained after the flow a is ignited at the outlet of the burner 1 .

[0050] In Figures 1, 2 and 3, the flame F is divided into two combustion zones I and II. The boundary of these two zones I and II is formed by the line where the flame F exceeds the temperature of 1500°C: in zone I the temperature is below 1500°C and in zone II the temperature is above 1500°C.

[0051] The rotary kiln 5 is also equipped with air injection means (not shown in the figure) for delivering the secondary air flow b around the burners. Flow b provides most of the combustion air and thus makes it possible to complete the combustion of the fuel initiated by the pr...

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Abstract

The invention relates to a method for calcination of a material in which said material is heated by contact with a heat source essentially generated by means of a flame produced with at least one flow of fuel and primary air and a flow of secondary air, the flame comprising a first combustion zone with a temperature below 1500° C. and a second combustion zone with a temperature above 1500° C., where at least one flow of at least one inert gas is injected into the flame at the beginning of the second combustion zone and / or at least one flow of oxygen or a gas enriched in oxygen is injected into the second combustion zone.

Description

technical field [0001] The present invention relates to a method for improving combustion in high temperature industrial furnaces / kilns and a device for improving combustion in such furnaces. Background technique [0002] High-temperature industrial processes used as energy fuels with non-negligible nitrogen content such as coal or petroleum coke produce large amounts of nitrogen oxides (NO x ) emissions are well known. NO x refers to all nitrogen oxides, especially nitric oxide (NO) and nitrogen dioxide (NO 2 ) is a comprehensive term. NO x According to its generation mechanism, it can be divided into two categories: fuel NO x and hot NO x . Fuel NO x Produced by oxidation of nitrogen compounds in fuel. Thermal NO corresponding to oxidation of atmospheric nitrogen by combustion-supporting oxygen x It mainly depends on three variables: [0003] - Oxygen concentration in the high temperature region (>1200°C) of the flame; [0004] - the residence time of oxygen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B7/36C04B7/43F23D14/32
CPCF23L7/00C04B7/434F23L2900/07002F23L2900/07005F27B7/36F27B2007/365Y02E20/344Y02E20/34
Inventor P·迪佩雷M·阿梅尔E·彭福尼斯X·波贝尔
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE