Top thermal insulation device suitable for anode baking furnace

Abstract

The invention discloses a top thermal insulation device suitable for an anode baking furnace. An inner filling thermal insulation material (2) is arranged in a semi-open type cavity of a half-surrounded type radiation protection housing; in addition, a semi-open thermal insulation cavity (4) is formed in the opening surface end of the inner filling thermal insulation material (2); a thermocouple is arranged on the half-surrounded type radiation protection housing; in addition, a measuring head of the thermocouple is arranged in the semi-open thermal insulation cavity (4); and landing legs are installed on the inner surface of the half-surrounded type radiation protection housing. When normally running, the top thermal insulation device is fixed to the outer surface of the top part of a high-temperature region of the anode baking furnace, the thermocouple can continuously collect temperature data of the top part of the baking furnace, a worker can detect the running condition of the furnace body through the collected data and a top part observation hole, the thermal insulation device can also be simply and rapidly disassembled from the top part, and a maintainer is convenient to carry out overhauling and maintenance. The top thermal insulation device also has the advantages of long service life, small running and maintenance workload and low running cost and is suitable for being used as an external thermal insulation device for the high-temperature region of the anode baking furnace.

Description

technical field [0001] The invention relates to a heat preservation device, in particular to an external heat preservation device for the top (including a roasting area, a preheating area, and other areas) of a roasting furnace (including a ring type roasting furnace, a sintered box type roasting furnace, and a single chamber furnace). Background technique [0002] Metal aluminum has excellent physical and chemical properties and plays an increasingly important role in today's society. The use of aluminum and aluminum alloys has penetrated into various important fields of national economic construction. According to statistics, there are currently more than 100 electrolytic aluminum production enterprises in my country, and their production capacity ranks first in the world. It has made great contributions to the rapid development of my country's national economy. The quality of the anode (also known as carbon anode, anode carbon block, anode for short) directly affects the ...

AI Technical Summary

Problems solved by technology

At present, there are mainly the following problems: ①The anode roaster occupies a large area, and generally requires an independent factory building with a roof; ②After the roaster has been in operation for more than 4 years, the furnace chamber is not well sealed, and the air leakage coefficient is high, resulting in a 15% reduction in fuel utilization. % or more, and affect product quality; ③Part of the coal tar pitch smoke cannot be fully burned in the flue, and is discharged with the roasting flue gas, resulting in increased energy consumption and increased pollution; High energy consumption and high resource consumption; ⑤The temperature at the top of the anode roasting furnace is too high, the production and maintenance environment is difficult, the heat loss is large, and the energy consumption is high

[0005] For the large heat loss and high energy consumption at the top of the roaster

At present, there are five commonly used insulation methods: the first is the ring-type roaster furnace cover before 2005, which is basically made of refractory lightweight clay bricks. Most domestic carbon companies are still using it today. Its advantages It is low cost and easy to construct, but the disadvantage is that the thermal conductivity of refractory bricks is high, and it increases with the temperature of the furnace room. During long-term high-temperature use, the refractory bricks shrink and deform, and gaps appear between each other, resulting in The negative pressure loss is large, and the heat loss is large, resulting in excessive waste of energy

The second is that after 2005, with the development and application of new materials and technologies, the ring-type roasting furnace covers of newly-built carbon enterprises are mostly made of ceramic fiber modules anchored and installed, which have small thermal conductivity and low bulk density. Advantages such as small heat loss, but high one-time cost

The third is to use diatomite bricks to cover the light bricks on the surface of the furnace cover. The advantage is that the weight is lighter and the density is only 0.5g / cm3, but the integrity is poor and the sealing is not good. It has already been eliminated.

The fourth is to use lightweight castables to spread evenly on the surface of refractory bricks. The advantage is that the integrity is better, and the insulation and sealing performance of the furnace cover is also better in the initial stage of use. However, with repeated changes in production temperature, the castables are resistant to thermal shock. Poor performance, cracking, falling off, etc., can not achieve the effect of sealing and heat preservation

The fifth is the more common heat preservation method for the furnace cover of the ring type roaster, that is, the silicate composite heat preservation coating is used to smear and cover the surface of the refractory brick. It is composed of refractory fiber powder, additives, binders, etc., and the heat preservation effect Better, but the disadvantage is that the strength is low, the dust in the carbon production industry is large, and frequent cleaning is required. The silicate composite insulation material falls off layer by layer during cleaning and use, and requires frequent repairs, and the service life is short

[0006] Based on the above reasons, these five methods of strengthening heat preservation have obvious shortcomings, and it is difficult to be widely used in actual production.

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