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Drying/pyrolysis furnace with rotary material beds

A technology of rotating material bed and pyrolysis furnace, which is applied to furnaces, coke ovens, furnace types, etc., can solve the adverse effects of coal pyrolysis quality, stability, and economy, poor heat transfer uniformity, and different residence times. And other issues

Active Publication Date: 2013-11-06
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the movement of the material on the material bed is only pushed and guided by the guide rake 28, and there is no physical barrier between different material rows, the controllability of the material movement is relatively weak
During the rotation process, the materials located in different rows are prone to back-mixing and cascading, etc., which makes the thickness and residence time of the materials on the rotating material bed different, and the uniformity of heat transfer and the degree of uniformity of pyrolysis also deteriorate.
When the above-mentioned rotary hearth furnace is enlarged to an industrial application scale, the situation of back-mixing and cascading of materials between different columns is more serious, so that the quality, stability, and economical efficiency of coal pyrolysis are adversely affected

Method used

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  • Drying/pyrolysis furnace with rotary material beds
  • Drying/pyrolysis furnace with rotary material beds
  • Drying/pyrolysis furnace with rotary material beds

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Embodiment approach

[0033] As an exemplary embodiment of the present invention, the closed case 10 may include an upper case 102 with a conical top and a lower case 104 connected to the upper case 102, wherein the upper case 102 and the lower case 104 A water seal is provided between them, and the pressure in the housing 10 can be maintained at atmospheric pressure or slightly positive pressure. The inner space formed by the upper casing 102 and the lower casing 104 accommodates N rotating material beds 30, and the central rotating shaft 40 is arranged along the center line of the casing 10, and extends downward through the lower casing 104 and bearings (not shown in the figure). ) and transmission (not shown).

[0034] In one embodiment of the present invention, N rotating material beds 30 define N moving trajectories of materials.

[0035] Each rotating material bed 30 includes a rotatable annular planar bed bottom 301 and an inner wall 302 and an outer wall 303 that are stationary relative to...

Embodiment 1

[0061] use Figure 1-Figure 5 The shown drying furnace or pyrolysis furnace of the present invention carries out low-temperature pyrolysis of Hulunbeier lignite in the following Table 1 and Table 2 for its industrial analysis and elemental analysis respectively. The benchmarks for industrial analysis and elemental analysis are both air-dry bases, while elemental analysis is only for organic matter, excluding ash and moisture.

[0062] Table 1

[0063]

[0064] Table 2

[0065]

[0066] The Hulunbeier lignite with a particle size of 15-50 mm obtained through crushing and screening is continuously sent into the above-mentioned drying furnace or pyrolysis furnace 100 on an industrial scale, and a furnace with an oxygen content of 0.8% and a temperature of 700 ° C is introduced into it. Oxygen-deficient hot gas is subjected to low-temperature pyrolysis with the following process parameters and operating conditions.

[0067] The structural parameters of the pyrolysis furna...

Embodiment 2

[0080] The Hulunbeier lignite with a particle size of 15-30 mm obtained through crushing and screening is continuously sent into the above-mentioned drying furnace or pyrolysis furnace 100 on an industrial scale, and an anaerobic furnace with an oxygen content of 0.8% and a temperature of 850 °C is passed through. The hot gas is subjected to low-temperature pyrolysis with the following process parameters and operating conditions.

[0081] The structural parameters of the pyrolysis furnace 100:

[0082] Daily processing capacity: 5000 tons / day;

[0083] Feed density 705kg / m 3 ;

[0084] The overall height of the rotating material bed: 2.5m, the minimum inner diameter: 5m,

[0085] The outer diameter of the pyrolysis furnace: 20m;

[0086] The pyrolysis furnace includes 5 rotating material beds that fall step by step, and their widths are: W 1 = 2.5m, W 2 =1.6m, W 3 =1.3m; W 4 =1.1m, W 5 =0.99m;

[0087] The material flow thickness in the rotating material bed is 500mm...

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Abstract

A drying / pyrolysis furnace with rotary material beds comprises a closed casing, N concentric-ring-shaped planar rotary material beds, a feed opening, N material baffles, N material blanking openings, and at least one waste gas outlet and / or pyrolysis gas product outlet, wherein the rotary material beds are arranged in the casing; two ends of each material baffle are in seamless connection with the inner wall and outer wall of a corresponding rotary material bed respectively; each rotary material bed comprises a rotatable planar bed base, as well as the inner wall and the outer wall which stay still relative to the bed base; at least one through hole is formed in the bed base of each rotary material bed; the heights of N rotary material beds reduce gradually from the inside to the outside; seamless connection is realized; being rotated to the position of a material baffle along with the bed base of a corresponding rotary material bed, material is pushed outward by the material baffle, and then falls to the next rotary material bed connected with the former material bed through the material blanking opening of the former material bed; through the manner, the material falls from the inside to the outside, is transported, through the bed bases of the N rotary material beds, to the blanking opening of the outermost rotary material bed, and is finally discharged out of the drying / pyrolysis furnace through the material blanking opening.

Description

technical field [0001] The invention relates to a drying furnace or a pyrolysis furnace with a rotating material bed, in particular to a drying furnace or a pyrolysis furnace with a rotating material bed for solid carbonaceous materials. Background technique [0002] In the context of the increasing shortage of global oil and gas resources, how to rationally utilize coal resources in a low-cost and environmentally friendly manner to realize coal's supplementation and even substitution of oil and gas resources has become an important research topic in the energy industry. [0003] After many years of research and a large number of experiments, it can be determined that the rational utilization of coal resources is to refine and comprehensively utilize coal according to the different characteristics of coal quality and coal types. Drying and pyrolysis technology is one of the basic ways for coal graded refining and comprehensive utilization. Generally, the pyrolysis of solid ...

Claims

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Application Information

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IPC IPC(8): F27B9/16C10B49/06
Inventor 崔哲卢洪赵香龙陈微翁力刘科
Owner CHNA ENERGY INVESTMENT CORP LTD
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