Method for preheating secondary air of rotary kiln by using high-temperature flue gas of submerged arc furnace
A technology for high-temperature flue gas and submerged arc furnaces, which is applied to furnaces, drum furnaces, furnace types, etc., to achieve good heat transfer effects, high heat transfer efficiency, and reduced hourly coal consumption
Active Publication Date: 2022-06-10
金冶(内蒙古)工程技术有限公司
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Problems solved by technology
[0004] Due to the high temperature of the submerged arc furnace flue gas, it must be cooled before entering the gas purification system for treatment. The traditional cooling process generally uses water-cooled flue, which is The waste heat of the flue gas is wasted, and the investment in water cooling equipment is increased
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Embodiment 1
[0038] As a further optimization of the above embodiment, considering the influence of the structure of the bypass pipe 10 on the heat exchange of the secondary air, the first section of the heat pipe 8 and the second section of the heat pipe 9 have an integral tubular structure to form a smoke pipe 15 made of stainless steel. The two ends of the pipe 15 are welded with flanges 16, and the first air pipe 17 is welded in the smoke pipe 15. The first air pipe 17 is Z-shaped and consists of two horizontal pipes and one vertical pipe welded together. The two horizontal pipe ports of a wind pipe 17 extend to the outside of the smoke pipe 15, the lower port of the first air pipe 17 is connected with the air inlet pipe 4, the upper port of the first air pipe 17 is connected with the bypass pipe 10, and the smoke pipe 15 A second air duct 18 is welded inside. The second air duct 18 is Z-shaped and consists of two horizontal pipes and a vertical pipe welded together. The two horizontal ...
Embodiment 2
[0042] Embodiment Four
Embodiment 3
[0044] Embodiment six
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The invention relates to the technical field of metallurgical waste heat utilization, and discloses a method for preheating secondary air of a rotary kiln by using high-temperature flue gas of a submerged arc furnace, which comprises the submerged arc furnace, a smoke outlet of the submerged arc furnace is provided with a discharge flue, a high-temperature section of the discharge flue is provided with a heat exchanger, and an inlet of the heat exchanger is connected with a secondary fan through an air inlet pipeline. An outlet of the heat exchanger is connected with a rotary kiln through an air outlet pipeline, the heat exchanger comprises a first heat pipe section and a second heat pipe section, the secondary fan blows cold air into the first heat pipe section, the cold air exchanges heat with high-temperature flue gas at the first heat pipe section to form low-temperature secondary air, and the low-temperature secondary air enters the second heat pipe section through a bypass pipe. The second section of the heat pipe exchanges heat with the high-temperature flue gas again to form high-temperature secondary air, and the high-temperature secondary air enters the rotary kiln through a secondary air barrel on the combustor; the device is reasonable in design, good in heat exchange effect and high in heat exchange efficiency, the flue gas temperature of the submerged arc furnace is reduced, the heat efficiency of the rotary kiln is improved, and the scheme is an important way for energy conservation and consumption reduction of enterprises.
Description
technical field [0001] The invention relates to the technical field of utilization of metallurgical waste heat, in particular to a method for preheating secondary air of a rotary kiln by utilizing high-temperature flue gas of an ore arc furnace. Background technique [0002] According to the relevant survey of my country Ferroalloy Industry Association, submerged arc furnace is the main mechanical equipment of ferroalloy products in my country, and the total electricity consumed by submerged arc furnace during operation accounts for about 2% of my country's total power generation. The flue gas produced in the submerged arc furnace smelting process has a large output and high temperature, and contains huge waste heat resources, and waste heat recovery is imperative. [0003] At present, the smelting process of producing primary nickel with laterite nickel oxide ore as raw material can be divided into pyrometallurgy and hydrometallurgy. The ore is dried in a drying kiln, and ...
Claims
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IPC IPC(8): F27B7/00F27B7/20F27B7/22F27B7/38F27D17/00F27D25/00
CPCF27B7/00F27B7/20F27B7/22F27B7/38F27D17/004F27D25/001Y02E20/34
Inventor 武君杰王强
Owner 金冶(内蒙古)工程技术有限公司