CN-116829267-B - Cyclone dust collecting apparatus and dust collecting method using the same

CN116829267BCN 116829267 BCN116829267 BCN 116829267BCN-116829267-B

Abstract

The cyclone dust collector 1 collects dust DT from a target gas TG containing the dust DT, and includes a dust separating section 3 for rotating the target gas TG about a horizontal rotation axis to separate dust from the target gas TG, a dust collecting section 4 connected to an outlet side of the dust separating section 3 to collect the dust DT separated by the rotation of the target gas TG by the dust separating section 3, and a gas collecting section 5 having an inlet provided in the dust collecting section 4 to collect the target gas TG from which the dust DT is separated, wherein a first ratio L/Dout of a distance L from an outlet of the dust separating section 3 to an inlet of the gas collecting section 5 to an outlet diameter Dout of the dust separating section 3 is not less than 0.4 and not more than 1.0.

Inventors

Kawashima Chino
Kobayashi Shoda
Kocho Noriko

Assignees

杰富意钢铁株式会社

Dates

Publication Date: 20260505
Application Date: 20220325
Priority Date: 20210330

Claims (5)

1. A cyclone dust collector for collecting dust from a gas to be processed discharged from a blast furnace or a converter, the cyclone dust collector comprising: An inflow pipe connected to the blast furnace or the converter; A dust separation unit connected to the inflow pipe, for swirling the gas to be processed flowing in from the inflow pipe with a lateral direction as a swirl axis, and separating dust from the gas to be processed; A dust recovery unit formed in a bottomed cylindrical shape and connected to an outlet side of the dust separation unit, the dust recovery unit being configured to recover the dust separated by the swirling of the gas to be processed by the dust separation unit, and A gas recovery unit having an inlet provided in the dust recovery unit, the gas recovery unit recovering the gas to be treated after separating the dust, A first ratio L/Dout of a distance L from an outlet of the dust separating section to an inlet of the gas recovering section to an outlet diameter Dout of the dust separating section is 0.4 to 1.0, The dust recovery unit has a swirl space portion provided between an outlet of the dust separation unit and an inlet of the gas recovery unit, and a dust chute provided at a bottom of the dust recovery unit, the dust chute being directly connected to a downstream side of the swirl space portion of the dust recovery unit in a flow direction of the gas to be processed, The dust separating part, the swirl space part and the gas recovering part are arranged along the swirl shaft, The dust separating section is configured so that an inner diameter thereof gradually widens from an upstream side toward a downstream side in a flow direction of the gas to be processed, The inner diameter of the swirl space portion is set to be the same as the outlet diameter Dout of the dust separating portion, The dust separated by the swirl of the gas to be processed collides with the inner wall of the swirl space portion and is recovered by the dust chute.
2. The cyclone dust collecting apparatus as claimed in claim 1, wherein the dust separating portion comprises a main body portion having a gas flow path extending in a lateral direction, and a flow rectifying member provided in the gas flow path of the main body portion so as to flow the gas to be treated in the lateral direction while swirling along an inner wall of the main body portion.
3. The cyclone dust collecting apparatus as claimed in claim 1 or 2, wherein a second ratio Dd/Dout of an inlet diameter Dd of the gas recovery section to an outlet diameter Dout of the dust separating section is 0.4 to 0.5.
4. The cyclone dust collecting apparatus according to any one of claims 1 to 3, wherein the gas recovery portion is formed such that a diameter thereof becomes wider from an inlet side of the gas to be processed toward a traveling direction.
5. A dust collecting method using the cyclone dust collecting apparatus according to any one of claims 1 to 4.

Description

Cyclone dust collecting apparatus and dust collecting method using the same Technical Field The present invention relates to a cyclone dust collector for collecting dust contained in a gas to be processed and a dust collecting method using the cyclone dust collector. Background For example, in a vertical iron melting furnace such as a blast furnace, high-temperature air is blown from a tuyere provided in the lower portion of the furnace in a state where an iron source and a heat source such as coke are alternately put into a layer. The air blown from the tuyere reacts with carbon in the coke to generate heat, and the iron source is melted by the heat. The air rises in the furnace. The gas reaching the vicinity of the furnace roof is discharged in a state containing dust formed by coke, solid particles of various sizes generated from the refractory in the furnace, and the like. Therefore, it is necessary to separate and collect dust formed of solid particles from exhaust gas of a blast furnace or the like. Conventionally, various methods have been used for separating dust from a gas to be processed, and cyclone dust collecting apparatuses have been known as an example thereof. The cyclone dust collector rotates the gas to be processed, thereby separating dust from the gas to be processed by centrifugal force. As a type of cyclone dust collecting apparatus, a vertical type cyclone dust collecting apparatus and a horizontal type cyclone dust collecting apparatus are known. Among them, a horizontal cyclone dust collector with a small pressure loss may be used depending on the nature of the gas to be treated, the installation environment, and the like (for example, see patent documents 1 and 2). Patent document 1 discloses a horizontal cyclone dust collector in which a gas to be processed is swirled along the circumferential direction of an inner wall portion in an inner space and moved in the axial direction, thereby separating dust. When the gas to be processed swirls, dust in the gas to be processed collides with the inner wall portion by centrifugal force. At this time, the movement component (whirling movement component) of the dust, which whirls along the inner wall portion, and the movement component (axial movement component) which moves in the axial direction disappear, and the dust is separated from the gas to be processed. Patent document 2 discloses a horizontal cyclone dust collector including a protruding portion formed to protrude from an inner wall portion toward a radial inner side of an inner space, and extending along a circumferential direction of the inner wall portion. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2008-6315 Patent document 2 Japanese patent application laid-open No. 2011-218250 Disclosure of Invention Problems to be solved by the invention However, in the cyclone dust collectors of patent documents 1 and 2, it is difficult to separate dust having a small particle diameter (mass) from the gas to be processed. Therefore, there is a problem that the recovery rate of fine dust in the cyclone dust collector is reduced. The present invention has been made in view of the above problems, and an object of the present invention is to provide a cyclone dust collector and a dust collecting method using the cyclone dust collector, which can improve the recovery rate of fine dust. Means for solving the problems [1] The cyclone dust collector is provided with a dust separating part for rotating the processed gas with a transverse rotation axis to separate dust from the processed gas, a dust recovering part connected to the outlet side of the dust separating part and recovering the dust separated by the rotation of the processed gas caused by the dust separating part, and a gas recovering part with an inlet arranged in the dust recovering part, wherein the gas recovering part recovers the processed gas after separating the dust, and the first ratio L/Dout of the distance L from the outlet of the dust separating part to the inlet of the gas recovering part to the outlet diameter Dout of the dust separating part is more than 0.4 and less than 1.0. [2] The cyclone dust collecting apparatus as described in [1], wherein the dust separating portion comprises a main body portion having a gas flow path extending in a lateral direction, and a flow rectifying member provided in the gas flow path of the main body portion so as to flow the gas to be treated in the lateral direction while swirling along an inner wall of the main body portion. [3] The cyclone dust collecting apparatus as described in [1] or [2], wherein a second ratio Dd/Dout of an inlet diameter Dd of the gas recovery portion to an outlet diameter Dout of the dust separation portion is not less than 0.4 and not more than 0.5. [4] The cyclone dust collecting apparatus as described in any one of [1] to [3], wherein the gas recovery portion is formed so that a diameter thereof becomes wider from an