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Gas-fired shaft furnace and method for melting reduced metal materials

A technology of gas and shaft furnace, applied in the direction of shaft furnace, furnace, furnace type, etc., can solve the problems of low temperature of molten metal, excessive burning loss of elements, etc., achieve low pollution degree, low oxidation burning loss of elements, and control oxidation burning loss Effect

Active Publication Date: 2018-04-13
YANTAI SANFENG GAS ENERGY SAVING TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention proposes a gas-fired shaft furnace and a melting method for smelting and reducing metal materials, which solves the problems of excessive burning of elements and low temperature of molten metal in existing shaft furnaces and melting methods

Method used

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  • Gas-fired shaft furnace and method for melting reduced metal materials
  • Gas-fired shaft furnace and method for melting reduced metal materials

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Embodiment 1

[0047] A method for melting reduced iron, comprising the steps of:

[0048] a. Adjust the mixing ratio of gas and air, ignite and preheat for 10-20 minutes, and keep the burner in a state of low power, so that the temperature in the furnace rises steadily to 1000 degrees Celsius;

[0049] b. Turn on all the burners, the instantaneous power is increased to 90%, and the air passing into the burners is mixed with 2%-5% pure oxygen to obtain oxygen-enriched gas, so that the proportion of oxygen in the oxygen-enriched gas is 24%. ~26%, the volume ratio of oxygen-enriched gas to the gas entering the furnace is 1:9, so that the temperature in the furnace rises rapidly to above 1600 degrees Celsius (preferably 1700 degrees Celsius);

[0050] c. Start charging. The charge includes: 50% recycled charge, 30% scrap steel and 20% raw iron. The charge is preheated, melted, and melted to obtain molten metal.

[0051] About 15 minutes later, the first batch of molten iron flows out from the ...

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Abstract

The invention provides a gas-fired shaft furnace and a melting method for smelting and reducing metal materials, and relates to the technical field of metal melting. The gas-fired shaft furnace includes a furnace body (1) and a burner (2) arranged on the side wall of the furnace body (1). , and the first pipeline (21) and the second pipeline (22) that communicate with the burner (2); also include: the main pipeline (20) that directly communicates with the burner, and the first pipeline (21) and the second pipeline respectively Pipeline (22) communicates; And, the 3rd pipeline (23), communicates with first pipeline (21); ) is provided with a regulating valve (24) at the connection inlet. Utilizing the melting method of the gas-fired shaft furnace for smelting and reducing metal materials, the temperature of the molten iron can reach 1450-1500°C by precisely controlling the ratio of gas, oxygen and air in the furnace; effectively controlling the oxidation and burning loss of the molten iron.

Description

technical field [0001] The invention relates to the technical field of metal melting, in particular to a gas-fired shaft furnace and a method for melting and reducing metal materials. Background technique [0002] At present, there are mainly two types of shaft furnaces used for melting metal materials: one is the traditional coke shaft furnace, and the heat is usually provided by coke combustion. In the process of melting iron, it is difficult to control the reducing atmosphere in the furnace, resulting in metal elements The chemical reaction with excess oxygen produces a large amount of metal oxides, and only a small amount of oxides are reduced to elemental metals, which inevitably causes excessive burning loss of C, Si, and Mn elements, and during the melting process, due to the Layer coke and relay coke are added according to the experience of the furnace worker, so the reducing atmosphere in the furnace, the temperature of tapping, and the burning loss of various eleme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/02
Inventor 唐焕春
Owner YANTAI SANFENG GAS ENERGY SAVING TECH CO LTD
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