Process and apparatus for utilizing medium-temperature smoke pre-heating combustion-supporting coal gas and air in hot-air stove

A technology of combustion-supporting air and hot blast stoves, applied in furnaces, blast furnaces, heating furnaces, etc., can solve problems such as difficulties in arranging flue gas stoves and pipelines, inability to fully utilize gas enthalpy, poor thermal efficiency of front flue gas stoves, etc., to achieve The effect of shortening the firing time, improving efficiency, and less conversion links

Inactive Publication Date: 2007-04-04
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

But there are also the following problems: ①The process is relatively complicated and occupies a large area
It is extremely difficult to arrange the flue gas furnace and its pipelines for general transformational blast furnaces due to the limitation of the site; ②The thermal efficiency of the front flue gas furnace is poor. From the perspective of energy utilization, whether it is economically cost-effective requires further demonst

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  • Process and apparatus for utilizing medium-temperature smoke pre-heating combustion-supporting coal gas and air in hot-air stove
  • Process and apparatus for utilizing medium-temperature smoke pre-heating combustion-supporting coal gas and air in hot-air stove

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Embodiment Construction

[0012] The technology of using the combustion exhaust gas of the hot blast stove to preheat the combustion air and gas with a heat pipe heat exchanger has been gradually promoted in domestic steel plants in the 1980s and 1990s. Usually, the temperature of the flue gas discharged from the hot blast stove is between 280°C-300°C, the air and gas can be preheated to about 160°C at the same time, and the blast furnace inlet air temperature can be increased by about 70°C. To further improve its preheating effect, the flue gas temperature needs to be increased. The purpose of this process is to effectively increase the flue gas temperature, make the combustion-supporting air and coal gas after heat exchange reach a certain heat enthalpy, increase the combustion temperature of the hot blast stove, and obtain a furnace inlet air temperature of 1250°C. Its process flow is shown in Figure 1.

[0013] First of all, a part of the medium-temperature flue gas from the middle-temperature zon...

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Abstract

A process and apparatus by medium-temperature smoke preheated and combustion-supporting air and gas in hot-air furnace are disclosed. The process is carried out by mixing medium-temperature smoke with low-temperature smoke or heat exchanging to obtain high-heat value smoke, preheating to obtain high-heat value combustion-supporting air and gas, setting smoke outlet in medium-temperature area of regenerative chamber, gas-flow exchanging and leading out preheated combustion-supporting air and gas partially. It's cheap, simple, has more heat efficiency and occupies less space.

Description

technical field [0001] The invention relates to a technology and special equipment for preheating combustion-supporting air and coal gas by using medium-temperature flue gas of a hot blast stove, which can be used in ironmaking technology. Background technique [0002] How to increase the blast furnace inlet air temperature is an urgent issue faced by ironworkers. On the one hand, due to the shortage of coking coal resources, it is required to increase the amount of coal injection in blast furnace smelting, thereby reducing the coke ratio into the furnace. However, after blast furnace smelting increases the amount of coal injection, the combustion temperature of the tuyere will decrease, and the combustion rate of pulverized coal will decrease. In order to ensure the smelting effect after increasing the amount of coal injection, an oxygen-enriched process can be used. However, domestic iron and steel plants are usually constrained by the limitation of surplus oxygen sources...

Claims

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Application Information

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IPC IPC(8): C21B9/00C21B9/14
Inventor 李汉明
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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