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Dust catcher for blast furnace gas

A technology of blast furnace gas and dust collector, which is applied in the direction of blast furnace, dust collector, blast furnace details, etc., can solve the problems of faster blast furnace gas flow rate, hinder the separation of coarse dust, limit the height of cyclone dust collector, etc., and achieve the effect of simple structure

Active Publication Date: 2015-09-23
NIPPON STEEL & SUMIKIN ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The dust collector in the above-mentioned patent document 2 can obtain higher dust collection performance by utilizing the settling chamber to collect dust and utilizing the cyclone dust collector to collect dust, but it will cause the following problems due to the following reasons: The recovery rate of coarse-grained dust is reduced by gravity sedimentation, and a part of coarse-grained dust is mixed with medium-grained dust and fine-grained dust to be recovered.
However, as shown in Patent Document 2, if the suction port of the cyclone dust collector is directly connected to the settling chamber, the high-speed blast furnace gas that is about to be sucked into the cyclone dust collector may drive the powder that settles near the suction port due to gravity. And make it sucked into the cyclone dust collector, which hinders the function of separating coarse dust by gravity settling
[0011] Third, in Patent Document 2, the cyclone dust collector is installed in the settling chamber, which may reduce the cross-sectional area of ​​the settling chamber, increase the velocity of the upwelling flow of blast furnace gas, and disturb the flow of blast furnace gas in the settling chamber
Therefore, it may also lead to the separation performance of coarse dust by gravity settling in the settling chamber.
[0012] Also, in Patent Document 2, the cyclone dust collector is arranged inside the dust collector, so that the air inlet of the cyclone dust collector will be located at the middle height position of the settling chamber, limiting the height of the cyclone dust collector itself
Since the cyclone is limited like this, there is also a possibility that the cyclone will not obtain sufficient dust collection performance

Method used

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  • Dust catcher for blast furnace gas
  • Dust catcher for blast furnace gas
  • Dust catcher for blast furnace gas

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0044]figure 1 It is a schematic diagram showing the overall configuration of the blast furnace gas purification system 1 according to the first embodiment of the present invention.

[0045] The blast furnace gas cleaning system 1 is a device for collecting dust (powder) from the blast furnace gas discharged from the top of the blast furnace 2, and has a dust collector 10 according to the present invention, and has a dry type dust collector such as an electric dust collector. Dust collector 3, Venturi dust collector and other wet dust collectors 4, furnace top pressure recovery turbine (TRT) 5, gas cabinet 6, pressure reducing valve 7.

[0046] In the blast furnace gas purification system 1, the blast furnace gas discharged from the top of the blast furnace 2 is collected by the dust collector 10 to form a semi-clean gas and sent to the secondary dust collector. The secondary dust collector usually uses a dry dust collector 3 to collect particulate dust. When the temperature ...

no. 2 Embodiment approach

[0075] Figure 5 The second embodiment of the present invention is shown.

[0076] In this embodiment, except that the diffusers 21 and 22 are provided inside the upper opening 112 and the cover member 14, other structures are the same as those described above. Figure 1 ~ Figure 4 The first embodiment shown is the same. Therefore, repeated descriptions are omitted, and only different structures will be described below.

[0077] A disc-shaped diffuser 21 is provided inside the upper opening 112 .

[0078] The diffuser 21 is formed of an annular steel plate, which protrudes from the inner circumference of the opening edge of the upper opening 112 to the inner side of the opening to form an inner flange. On the lower surface side of the diffuser 21, steel plates are welded at predetermined intervals. Reinforcing plate 211 .

[0079] A cylindrical diffuser 22 is provided inside the cover member 14 .

[0080] The diffuser 22 is formed of a cylindrical steel material, protrude...

no. 3 Embodiment approach

[0090] Figure 7 The third embodiment of the present invention is shown.

[0091] This embodiment has the same Figure 1 ~ Figure 4 The shown first embodiment has the same configuration, but the shape of the suction port 163 of the cyclone 16 is different from that of the first embodiment.

[0092] That is, in the first embodiment, as Figure 4 As shown, the suction port 163 of the cyclone dust collector 16 is in the shape of expanding on the side close to the distribution chamber 15 . In this regard, the suction port 163 of the present embodiment is a slit-shaped passage with a certain width whose shape on the side close to the distribution chamber 15 is the same as that on the side close to the main body 160 .

[0093] According to this embodiment as described above, the respective effects of the first embodiment described above can be respectively obtained.

[0094] However, the effect of suppressing the flow velocity on the side closer to the distribution chamber 15 by...

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PUM

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Abstract

This dust catcher for blast furnace gas (10) has: a settling chamber (12) which is formed inside a vessel (11); an inlet pipe (13) for introducing a blast furnace gas into the settling chamber (12); a distribution chamber (15) which is provided above the settling chamber (12) and communicates with the upper part of the settling chamber (12); and multiple cyclones (16) which are arranged around the settling chamber (12) and have an air intake port (163) communicating with the inside of the distribution chamber (15).

Description

technical field [0001] The invention relates to a method and equipment for purifying blast furnace gas produced in a blast furnace, in particular to a dust collector for blast furnace gas. Background technique [0002] Since the blast furnace gas discharged from the top of the blast furnace is in a state of high temperature and high pressure, the energy (heat and pressure) of the gas is usually recovered by the top pressure recovery turbine power generation device (TRT). However, blast furnace gas cannot be directly used for TRT because it contains dust and the like scattered from raw materials charged in the blast furnace. Therefore, the exhaust gas is treated by the gas purification system equipped with the blast furnace to make it purified. The blast furnace gas processed by TRT is used as fuel gas for heating furnaces, boilers, etc. in ironworks. [0003] Generally speaking, coarse dust is removed by a dust collector as a primary dust collector (a dust collector that r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/22B01D50/00B04C5/24F27D17/00
CPCB01D45/12C21B7/22F27D17/008F27B1/18C21B7/002F27D17/001B01D45/06F27D17/002
Inventor 富崎真
Owner NIPPON STEEL & SUMIKIN ENG CO LTD
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