A method for energy-saving, environment-friendly and efficient operation of a high-temperature shaft kiln for high-purity magnesia calcination

Abstract

The invention belongs to the technical field of high-purity magnesia high-temperature shaft kiln production, and specifically relates to a method for energy-saving, environment-friendly and efficient operation of a high-purity magnesia high-temperature shaft kiln for calcining high-purity magnesia. And the three aspects of raising the discharge flue gas temperature; wherein the method of maintaining the negative pressure in the kiln is to use the kiln cover plate of the welded structure; the method of forming the high-speed air flow at the kiln mouth feeding position is to use the air flow to form a sleeve; the lifting discharge The structure of flue gas temperature includes return air fan, return air pipeline and hot air circulation inlet pipeline. Compared with the prior art, the beneficial effects of the present invention are: 1) The absolute value of the negative pressure inside the kiln is increased by 500pa, which can reduce the energy consumption of the smoke exhaust fan by 40% compared with the past. 2) The bonding in the high temperature area is not obvious, and the operating life of the kiln (cleaning cycle) is more than doubled. 3) Raise the temperature of flue gas discharged from the kiln by more than 50°C, realizing the energy-saving, environment-friendly, efficient and safe operation of the high-temperature shaft kiln.

Description

technical field [0001] The invention belongs to the technical field of high-purity magnesia high-temperature shaft kiln production, and in particular relates to a method for energy-saving, environment-friendly and efficient operation of a high-purity magnesia high-temperature shaft kiln for calcination. Background technique [0002] In recent years, my country has used the high-temperature shaft kiln calcination process to process natural magnesite, and the quality factor of natural magnesite MgO produced has reached 97%-98%, which has greatly improved the level of magnesia refractories in my country. The calcination process of the high-temperature shaft kiln used for calcination of high-purity magnesia is fed from the center of the kiln. Most of these kilns are built with refractory bricks (2) and ramming materials (3) on the outside, and the kiln shell (1) is steel plate. See figure 1 , the upper hopper (4) sits on the kiln cover (5), and the center of the lower part of t...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a high-purity magnesia calcining high-temperature vertical kiln energy-saving, environmentally friendly and efficient operation method to overcome the deficiencies of the prior art and solve the kiln cover plate thermal deformation during the repeated heating and back-burning process of kiln drying and calcination , and even disintegration and fall-off caused by the reduction of negative pressure in the kiln and the increase of air leakage rate; reduce the probability of small-grained materials accumulating and bonding to the inner wall of the kiln during the kiln calcination process, prolong the cycle of kiln shutdown and cleaning, and avoid damage to the kiln body ;Increase the flue gas discharge temperature of the kiln above 50°C, reduce the flue gas emission at the same time, facilitate the follow-up denitrification treatment of the flue gas of the kiln, reduce the operating cost of environmental protection equipment, ensure smooth production, and respond to the national environmental protection policy of energy conservation and emission reduction

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