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Vertical gas furnace and melting method for fusing and reducing metal material

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

Active Publication Date: 2016-04-20
YANTAI SANFENG GAS ENERGY SAVING TECH CO LTD
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  • Claims
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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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  • Vertical gas furnace and melting method for fusing and reducing metal material
  • Vertical gas furnace and melting method for fusing and reducing metal material

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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 vertical gas furnace and a melting method for fusing and reducing a metal material, and relates to the technical field of metal melting. The vertical gas furnace comprises a furnace body (1), burners (2), a first pipeline (21), a second pipeline (22), a main pipeline (20) and a third pipeline (23), wherein the burners (2) are arranged on the side wall of the furnace body (1); the first pipeline (21) and the second pipeline (22) communicate with the burners (2); the main pipeline (20) directly communicates with the burners (2) and communicateswith the first pipeline (21) and the second pipeline (22) separately; the third pipeline (23) communicates with the first pipeline (21); and regulating valves (24) are arranged at positions of connection inlets of the burners (2), the first pipeline (21), the second pipeline (22) and the third pipeline (23) separately. According to the melting method for fusing and reducing the metal material by using the vertical gas furnace, proportions of gas, oxygen and air inside the furnace are controlled accurately, and the temperature of melted iron can reach 1450-1500 DEG C; and the oxidation burning loss of the melted iron is controlled effectively.

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 Applications(China)
IPC IPC(8): C21B13/02
Inventor 唐焕春
Owner YANTAI SANFENG GAS ENERGY SAVING TECH CO LTD
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