Method and plant for the conveyance of fine-grained solids

A solid, fine-grained technology, used in chemical instruments and methods, lighting and heating equipment, direct-contact heat exchangers, etc., to solve problems such as particle disintegration, solids transport, corrosion, etc.

Active Publication Date: 2006-05-03
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 plant for the conveyance of fine-grained solids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 (heat transfer transports Fe under oxidation condition 2 o 3 or titanium ore)

[0049] In the device corresponding to the attached figure, 65.7t / h of Fe at a temperature of 985°C 2 o 3 Supplied to the reactor for transport, possibly also dried under an oxidizing atmosphere. In addition, feed 1000Nm into reactor 1 through pipeline 6 as transport medium 3 / h of air, fed into 12300Nm through central tube 3 3 The temperature of / h is 50°C air, which is mixed with 532Nm in the center pipe 3 before entering the annular fluidized bed 10 3 / h mix of natural gas as fuel. Take out 65.7t / h Fe at 1000°C from the reactor through pipeline 8 2 o 3 .

[0050] The fluidization conditions with a particle Froude number of about 3 in the mixing chamber 7 allow internal combustion of natural gas without temperature peaks. Temperature losses in the reactor 1 due to radiation of the reactor walls and mixing of the solids with cold conveying air can be avoided with this ...

Embodiment 2

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

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

[0056] 40000Nm at a temperature of 900°C 3 / h of hydrogen is supplied to the reactor 1 through the center pipe 3 from the upstream reduction section for iron ore, and the temperature is 750Nm of the 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 chosen such that the particle Froude number in the annular fluidized bed 10 is approximately 0.15, the particle Froude number in the mixing chamber 7 is approximately 1.8, and the particle Froude number in the central tube 3 is approximately 0.15. The number is about 8.

[0057] In this way it is possible to convey fine-grained iron sponge in reactor 1 to a height of about 50 m and at the same time to heat it to the...

Embodiment 3

[0058] Embodiment 3 (conveying and cooling cement)

[0059] In the apparatus corresponding to the figure, 68 t / h of fine-grained cement at a temperature of about 600° C. is fed into the reactor 1 through the supply pipe 2 .

[0060] 6250Nm at a temperature of 50°C 3 / h of air is supplied to the reactor 1 through the central tube 3 as the transport medium, and then the 750Nm at a temperature of 50°C 3 / h of air is supplied to the reactor 1 via the gas distributor chamber 4 as fluidizing gas. In this case, the gas velocity is chosen such that the particle Froude number in the annular fluidized bed 10 is approximately 0.15, the particle Froude number in the mixing chamber 7 is approximately 1.8, and the particle Froude number in the central tube 3 is approximately 0.15. The number is about 8. A temperature of 510°C was established in the transfer line.

[0061] In addition, 2600 kg / h of water at a temperature of about 20° C. was supplied to the reactor 1 by means of a lance a...

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Abstract

The invention relates to a method and a corresponding device for conveying fine-grained solids in a fluidized bed reactor. It is proposed to introduce the first gas or gas mixture from below into the mixing chamber (7) of the reactor (1) through a central tube (3) which is at least partially fluidized by a fixed annular fluidized bed ( 10) Surrounded. Adjust the gas velocity of the first gas or gas mixture and the fluidizing gas for the annular fluidized bed (10) so that the particle Froude number in the central tube (3) is 1-100, the annular fluidized bed (10) The particle Froude number in the mixing chamber (7) is 0.02-2, and the particle Froude number in the mixing chamber (7) is 0.3-30.

Description

technical field [0001] The present invention relates to a method and a corresponding device for conveying fine-grained solids in a fluidized bed reactor. Background technique [0002] These methods and devices are used in various technical fields for different gas-solid mixing. For example, reduced iron ore to produce sponge iron briquettes has to be conveyed to a height of about 50m to feed and distribute it to the individual compactors. Also in the gas reduction process for the direct reduction of iron ore or titanium-bearing ores, the heating material is fed to the treatment reactor by gravity. To do this, they must first be conveyed to great heights. [0003] The conveying of fine-grained solids is usually carried out by pneumatic conveying, that is, the solids are introduced into the conveying pipe and entrained by the vertical upward air flow, so that the solids are discharged at the upper end of the conveying pipe. The traditional form of construction is to draw th...

Claims

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Application Information

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