Gas and oxygen mixed combustion method for cupola furnace and cupola furnace
A technology of mixed combustion and cupola, which is applied in combustion methods, gas fuel burners, burners, etc., can solve the problems of low molten iron temperature in gas-fired shaft furnaces, and achieve high molten iron temperature, low pollution, and easy adjustment. and control effects
Inactive Publication Date: 2012-09-19
王林海 +1
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[0003] The invention proposes a method for mixed combustion of gas and oxygen used in cupola furnaces and the cupola, which solves the problem of low temperature of molten iron in gas-fired shaft furnaces in the prior art
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[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0037] A kind of method for the gas and oxygen mixed combustion of cupola according to the present invention comprises the following steps:
[0038] After vaporizing liquid oxygen, it is mixed with air to form oxygen-enriched gas;
[0039] Mixing oxygen-enriched gas with fuel gas to form oxygen-enriched gas, wherein the oxygen concentration of oxygen-enriched gas is 3% to 30%;
[0040] The oxygen-enriched gas is injected and burned at a high speed under the pressu...
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The invention provides a gas and oxygen mixed combustion method for a cupola furnace. The method comprises the following steps of: gasifying liquid oxygen, and mixing the gasified liquid oxygen and air to form oxygen-enriched gas; mixing the oxygen-enriched gas and gas to form oxygen-enriched fuel gas, wherein the oxygen concentration of the oxygen-enriched gas is 3 to 30 percent; and performing high-speed spray combustion on the oxygen-enriched gas under the pressure of 400 to 533kPa. The invention also provides a cupola furnace, which comprises a shaft furnace, a forehearth and a feeder, wherein the shaft furnace comprises a crucible, a nozzle section, a preheating section, a feeding hole section, a hot-air heat exchanger; the crucible is used for accommodating dripped molten iron; the nozzle section is arranged on the upper part of crucible and is used for heating the molten iron formed by melting furnace burden; the preheating section is arranged on the upper part of the nozzle section and is used for heating and melting the furnace burden; the feeding hole section is arranged on the upper part of the preheating section; the hot-air heat exchanger is arranged on the upper part of the feeding hole section and is connected with the nozzle section through a hot-air pipe; the forehearth is used for adjusting the temperature and chemical composition of the molten iron and is connected with the crucible; and the feeder is connected with the feeding hole section. The invention has the advantages that the temperature of the molten iron is greatly improved, and the cupola furnace is low-carbon and energy-saving.
Description
technical field [0001] The invention relates to the technical field of smelting, in particular to a method for mixed combustion of gas and oxygen used in a cupola and the cupola. Background technique [0002] At present, most of the existing domestic cupolas use coke-fired cupolas, and the blower directly blows air for combustion without adding any combustion-supporting gas. There are problems such as low production efficiency, difficulty in controlling the temperature of molten iron, increased carbon and sulfur, insufficient combustion, and substandard emissions. The problem of serious pollution cannot achieve the goal of low-carbon energy saving and environmental protection. Gas shaft furnace is an industrial furnace that uses natural gas and liquefied petroleum gas as fuel to melt cast iron. It belongs to the most advanced technology for melting cast iron in the world today. This furnace is also called natural gas cupola by some people in China. The gas-fired shaft furna...
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Login to View More IPC IPC(8): F23D14/02F27B1/04F27B1/22F27B1/28
CPCY02E20/34
Inventor 王林海唐焕春
Owner 王林海