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Method and apparatus for the conveyance of fine-grained solids

A fine-grained, solid-state technology used in chemical instruments and methods, lighting and heating equipment, direct-contact heat exchangers, etc., to solve problems such as corrosion, particle disintegration, and blockage of gas supply pipes

Inactive Publication Date: 2009-04-01
METSO OUTOTEC (FINLAND) OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high speeds necessary here can lead to corrosion or, in the case of allergic solids, to disintegration of the granules
Another disadvantage is that despite high gas velocities, at large diameters, solids can fall through a limited cross-sectional area against the direction of the gas flow and block the gas supply pipe
However, this type of reactor is not suitable for transporting solids to very high altitudes

Method used

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  • Method and apparatus for the conveyance of fine-grained solids
  • Method and apparatus for the conveyance of fine-grained solids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 (Heat transfer and transportation of Fe under oxidizing conditions 2 O 3 Or titanium-containing ore)

[0049] In the device corresponding to the figure, 65.7t / h Fe 2 O 3 The reactor supplied for transportation may also be dried in an oxidizing atmosphere. In addition, as a conveying medium, 1000Nm is supplied to the reactor 1 through the pipeline 6 3 / h of air, 12300Nm is supplied through the central pipe 3 3 / h of air with a temperature of 50°C. The latter is in the center tube 3 with 532Nm before entering the annular fluidized bed 10 3 / h Natural gas blend as fuel. Take out 65.7t / h Fe with a temperature of 1000℃ from the reactor through pipe 8. 2 O 3 .

[0050] The fluidization condition with the Frud number of particles in the mixing chamber 7 is about 3, so that the natural gas is combusted internally without a temperature peak. With this method, the temperature loss in the reactor 1 caused by the radiation of the reactor wall and the mixing of solids and cold...

Embodiment 2

[0054] Example 2 (conveying and heating sponge iron)

[0055] In the device corresponding to the figure, fine-grained sponge iron of 68 t / h with a temperature of about 650° C. is fed into the reactor 1 through the supply pipe 2.

[0056] Set the temperature to 40000Nm at 900℃ 3 / h of hydrogen is supplied to the reactor 1 from the upstream reduction section for iron ore through the central pipe 3, and the temperature is 750Nm of ambient temperature 3 / h of hydrogen is supplied to the reactor 1 through the gas distributor chamber 4. In this case, the gas velocity is selected so that the Frude number of the particles in the annular fluidized bed 10 is about 0.15, the Frude number of the particles in the mixing chamber 7 is about 1.8, and the Frude number of the particles in the central pipe 3 is about 1.8. The number is about 8.

[0057] In this way, the fine-grained sponge iron can be transported in the reactor 1 to a height of about 50 m, and at the same time it is heated to the te...

Embodiment 3

[0057] In this way, the fine-grained sponge iron can be transported in the reactor 1 to a height of about 50 m, and at the same time it is heated to the temperature required by the downstream briquetting process, so that the sponge iron agglomerates can be formed. Example 3 (transporting and cooling cement)

[0058] In the device corresponding to the figure, 68 t / h of fine-grained cement with a temperature of about 600° C. is fed into the reactor 1 through the supply pipe 2.

[0059] Set the temperature to 6250Nm at 50℃ 3 / h of air is supplied to the reactor 1 through the central pipe 3 as the conveying medium, and then 750Nm with a temperature of 50℃ 3 / h of air is supplied to the reactor 1 through the gas distributor chamber 4 as fluidizing gas. In this case, the gas velocity is selected so that the Frude number of the particles in the annular fluidized bed 10 is about 0.15, the Frude number of the particles in the mixing chamber 7 is about 1.8, and the Frude number of the parti...

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Abstract

The present invention relates to a method for the conveyance of fine-grained solids in a fluidized bed reactor and also to a corresponding plant. It is proposed to introduce a first gas or gas mixture from below through a central tube ( 3 ) into a mixing chamber ( 7 ) of the reactor ( 1 ), the central tube ( 3 ) being at least partly surrounded by a stationary annular fluidized bed ( 10 ) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed ( 10 ) are adjusted such that the particle Froude numbers in the central tube ( 3 ) are between 1 and 100, in the annular fluidizied bed ( 10 ) between 0.02 and 2 in the mixing chamber ( 7 ) between 0.3 and 30.

Description

Technical field [0001] The invention relates to a method for conveying fine solids in a fluidized bed reactor and a corresponding device. Background technique [0002] These methods and devices are used in various technical fields for different gas-solid mixing. For example, the reduced iron ore that produces sponge iron briquettes must be transported to a height of about 50 m in order to be supplied and distributed to various briquetting machines. Also for the direct reduction of iron ore or titanium-containing ore in the gas reduction process, the heating raw material is supplied to the processing reactor by gravity. For this, they must first be transported to a very high height. [0003] The conveying of fine solids is usually carried out by pneumatic conveying, that is, the solids are introduced into the conveying pipe and are entrained by the vertical upward airflow, so that the solids are discharged at the upper end of the conveying pipe. The traditional form of structure i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/00B01J8/18B01J8/24C04B7/47C22B1/10F28C3/16
CPCB01J8/1827C04B7/47F28C3/16B01J8/0025B01J2208/00752C22B1/10B01J8/1854B01J8/1872B01J8/1845
Inventor J·弗里塔格M·赫施M·斯特罗德
Owner METSO OUTOTEC (FINLAND) OY
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