Method for heating a blast furnace stove

Inactive Publication Date: 2016-05-26
LINDE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]Another method embodiment for heating a blast furnace stove is provided which combines flue gas recycle with oxy-fuel combustion

Problems solved by technology

The combustion of such additional fuel leads to larger overall emissions of carbon dioxide from the plant, and is therefore not desirable.
Such methods may in some cases render peak flame temperatures high enough to damage the refractory material of the stove, and it may be necessary for example to supply an excess air rate to suppress the flame temperature.
All the above-described methods add complexity to the process and require costly equipment.
It is approaching the limits of thermodynamic efficiency, which is why it is difficult to reduce ene

Method used

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  • Method for heating a blast furnace stove
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  • Method for heating a blast furnace stove

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Embodiment Construction

[0030]It is preferred, in the context of the present invention, to heat the stove with blast furnace top gas, as described above. It is furthermore preferred to use top gas from a blast furnace to which blast air is provided from the stove. This allows for the arrangement of the stove near the blast furnace, is energy efficient and leads to low total emissions from the plant.

[0031]However, it is to be understood that the present invention can be equally advantageously applied to stoves heated with other low-grade fuels. By way of example, typical chemical compositions (percentage values) and lower heating values (LHV) are provided in Tables I and II, respectively, for blast furnace top gas and converter off-gas.

TABLE 1N2H2OO2H2COCO2CH4CmHnTop gas52.50.552.323.520——1.15Off-gas17.20.12.564.515.6——0.1

TABLE 2LHV (MJ / Nm3)LHV (MJ / kg)Top gas3.22.4Off-gas6.38.4

[0032]According to the present invention, the stove is heated with a gaseous fuel the LHV value of which is not higher than 9 MJ / Nm3...

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Abstract

A method for heating a blast furnace stove includes combining flue gas recycling and oxy-fuel combustion for concentrating CO2 for facilitating carbon capture and reducing CO2 emissions from a plant operatively associated with the stove. Top gas from a blast furnace associated with the stove may be the fuel for the stove.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a method for heating a blast furnace stove for use with a blast furnace.[0002]The hot-blast air supplied to a blast furnace is typically preheated using a stove, comprising refractory material which is heated using a burner. When the material is hot enough, cold=blast air is passed through the stoves to pre-heat it before injection into the blast furnace. Usually, several stoves are operated in parallel and cyclically so that at least one stove is operated for heating the cold blast air while the refractory material of at least one stove is heated.[0003]Conventionally, the top gas leaving the blast furnace has a temperature of around 110-120° C. and contains about 20-25% each of CO and CO2. Typically, 3-5% H2 and some H2O will also be present, but the other major constituent of the top gas is N2 (typically 45-57%). The gas constitutes a low grade fuel, having a relatively low heating value, and is commonly used to fue...

Claims

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Application Information

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IPC IPC(8): C21B9/14F23C9/00F23L7/00
CPCC21B9/14F23C9/00F23L7/00F23L7/007Y02P10/122C21B2100/60C21B2100/282Y02E20/34Y02P10/32
Inventor CAMERON, ANDREWEKMAN, TOMASGARTZ, MATS
Owner LINDE AG
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