Closed type calcium carbide furnace charging nozzle and process for producing same

Abstract

The invention provides a closed type calcium carbide furnace charging nozzle and a process for producing the same. The charging nozzle mainly comprises two groups of seamless external casings, seamless internal casings, water inlet pipes, water outlet pipes, communication pipes and bottom edge embedded flanges; the seamless internal casings are arranged in the seamless external casings; the bottom edge embedded flanges, the water inlet pipes and the water outlet pipes are arranged on the two groups of the seamless external casings respectively; and the two groups of seamless external casings are communicated with the communication pipes. The charging nozzle has the advantages of solving the problems of water leakage due to frequent breakage and frequent shut-down of the furnace for exchange, meeting the requirements on the charging production of a closed type calcium carbide furnace, effectively improving quality structure of material layers around electrodes, greatly improving furnace conditions (avoiding piling of materials on the outer side of the charging nozzle), making the materials keep a steamed bread-shaped charge surface around the electrodes, further effectively reducing thermal loss, alleviating the insufficiency of the materials in the central region of the furnace, reducing the temperature of the charge surface, reducing exposing areas of the electrodes, reducingthe thermal loss of electrode resistances, improving the quality structure of the material layers, contributing to improving the pre-heating of the furnace materials and forming a big crucible region, ensuring good furnace conditions, avoiding frequent occurrence of material stamping and material throwing, and further facilitating the technical operation and control of the furnace and high yield,high quality and low energy consumption of the furnace.

Description

Technical field [0001] The invention relates to the technical field of smelting equipment, in particular to a completely new and optimized design of a closed calcium carbide furnace charging nozzle and a manufacturing process. Background technique [0002] At present, the feeding nozzle of the closed calcium carbide furnace commonly used at home and abroad is made of stainless steel or other steel plates with multiple coils and tailored welding. There are many welds, the welding stress is relatively large, the inner arc surface is close to the electrode, and the temperature It is higher, which often causes the internal arc surface welding seam to tear and leak under the action of welding stress and thermal stress, and the convex deformation of the internal arc surface is more serious, which causes the nozzle to be easily burned. At the same time, due to the material The nozzle is made of magnetically insulated stainless steel material, so its cost is relatively high. At the same ...

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Problems solved by technology

[0002] At present, the commonly used closed calcium carbide furnace charging nozzles at home and abroad are made of stainless steel plates or other steel plates that are rolled and welded together. Higher, which often leads to tearing and water leakage of the inner arc surface weld seam under the action of welding stress and thermal stress, and serious convex deformation of the inner arc surface, which makes the nozzle of this kind of material very easy to be burned. The nozzle is made of magnetically isolated stainless steel, so its cost is relatively high. At the same time, it takes at least three hours to replace a nozzle when the furnace is shut down. This will affect the production operation, control, furnace material surface structure, and furnace condition. Cause a relatively large impact, and have a relatively large negative impact on production costs and output quality

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