High-temperature-calcined [alpha]-Al2O3 production energy-saving apparatus and novel method

A high-temperature calcination and alumina technology, which is applied to the preparation of alumina/hydroxide and alumina/hydroxide, can solve the problems of high energy consumption and heat energy reduction, and achieve the reduction of tail gas temperature, increase of heat exchange area, The effect of high heat recovery rate

Active Publication Date: 2015-11-11
SHANDONG LUBEI ENTERPRISE GROUP +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a high-temperature calcined α-alumina high-efficiency energy-saving device and a new method for the above-mentioned problems such as high energy consumption. This method can reduce the heat energy by about 1,027,000 kilojoules per ton of α-alumina product compared with the traditional method. Reduce natural gas consumption by 28.6m 3 / t product, while the material is relatively stable due to sufficient preheating and uniform product quality

Method used

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  • High-temperature-calcined [alpha]-Al2O3 production energy-saving apparatus and novel method
  • High-temperature-calcined [alpha]-Al2O3 production energy-saving apparatus and novel method
  • High-temperature-calcined [alpha]-Al2O3 production energy-saving apparatus and novel method

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Experimental program
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Effect test

Embodiment 1

[0067] A high-efficiency energy-saving device for calcining α-alumina at high temperature, including a rotary kiln, a cyclone preheater group is connected to the hollow rotary kiln tail, and the cyclone preheater group includes at least two-stage cyclone preheaters; at the kiln head of the rotary kiln Connect the cooling unit.

[0068] The cyclone preheater group takes three stages as an example, including a three-stage cyclone preheater. The cyclone preheater includes a cylindrical body 3 and a cone 4 at the bottom, and a lateral inlet is provided at the upper end of the cylindrical body. The air cylinder 1 and the middle air outlet vertical cylinder 2 are provided with a blanking lock wind flap valve 5 at the lower part of the cone 4; the side air inlet cylinder 1 of the upper cyclone preheater and the lower cyclone preheater The middle air outlet vertical tube 2 is connected through the air duct 6, and the air duct 6 is provided with a feed inlet 7, and the lower cone 4 of ...

Embodiment 2

[0089] (1) Heat exchange steps between raw materials and tail gas: the raw materials aluminum hydroxide and industrial alumina come out of the silo 16 for measurement (measurement scale 17) and enter the feed port of the first-stage cyclone preheater (the wind of the first-stage cyclone preheater tube feed port), the tail gas from the rotary kiln at 650-750°C enters the side air inlet tube of the third-stage preheater, and the material from the first-stage preheater is respectively carried out in the cyclone preheater group for countercurrent gas- Solid heat exchange; the flue gas temperature at the side inlet of the first stage cyclone preheater is 380-420°C, the flue gas temperature at the outlet of the middle air outlet shaft is 200-240°C, and the side inlet of the second stage cyclone preheater The flue gas temperature at the inlet of the cylinder is 530-570°C, the temperature of the flue gas at the outlet of the middle outlet vertical cylinder is 380-420°C, the temperature...

example 3

[0144] The material temperature before cooling is 890C°, the material volume is 18-20t / h, and the material temperature after cooling is <100C°.

[0145] The specifications of the cooling cylinder: cylinder 73 diameter 3.6m*38m, material pipe 22 diameter 470mm, thickness 6mm, length 18000mm, quantity 18, single-layer distribution, material stainless steel, air duct 70 diameter 108mm, thickness 6mm, length 18000mm, quantity 100, double-layer distribution, material carbon steel, blower air volume 22500m3 / h.

[0146] Cylinder installation slope: 4%, cylinder speed: 4.23r / min.

[0147] Energy-saving effect of cooling device:

[0148] 1.23kj / kg.℃×1000kg×(890℃-100℃)=971700kj / t

[0149] 971700kj / t×60%=583020kj / t

[0150] Save heat energy 583020kj per hour.

[0151] Example 2: cooling 10t / h high temperature calcined a-alumina

[0152] The material temperature before cooling is 910C°, the amount of material is 10t / h, and the material temperature after cooling is <100C°.

[0153] C...

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Abstract

The invention relates to the technical field of non-metal novel materials and particularly provides a high-temperature-calcined [alpha]-Al2O3 production energy-saving apparatus and a novel method. In the invention, a cyclone preheater group (may comprises two stages, three stages and four stages), and a cooling apparatus are added at the tail of a hollow long kiln to cooling high-temperature-calcined materials. The cyclone preheater group is fully utilized to reduce the temperature of high-temperature flue gas at about 400 DEG C at the tail of a hollow rotary long kiln to 160-220 DEG C. Meanwhile, by means of the unique cooling apparatus, more than 60% of heat energy can be recycled. The apparatus can save fuel by more than 30% when compared with an apparatus in the prior art. The apparatus and the method fully utilize the heat energy in the tail gas of the rotary kiln, can effectively recycle the heat energy in the calcined materials, can greatly reduce the temperature of tail gas and recycle the heat energy when the product is cooled as more as possible, thereby achieving energy saving and emission reduction and laying the foundation of non-metal new material industry.

Description

technical field [0001] The present invention relates to the technical field of new non-metallic materials, in particular to a high-temperature calcined α-alumina production energy-saving device and a new method, which are used for high-temperature calcined α-alumina when aluminum hydroxide and industrial alumina are used as raw materials. Reduce the exhaust temperature and maximize the recovery of heat energy when the product is cooled to achieve energy saving and emission reduction. Background technique [0002] High-temperature calcined α-alumina, as a new type of material and environmentally friendly material, has become more and more widely used, and its value has been soaring all the way. Artificial gemstones can also be used in aviation, missile, military and other fields. No matter what industry it is used in, high-temperature calcination is necessary when the final crystal form is transformed into α-alumina. At present, the production methods of high-temperature ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/02
Inventor 吕天宝武文焕冯怡利武建民张荣安邱维志
Owner SHANDONG LUBEI ENTERPRISE GROUP
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