WO2019062612A1

WO2019062612A1 - Tangential multi-pipeline cyclone dust remover for primary dust removal of blast furnace gas

Info

Publication number: WO2019062612A1
Application number: PCT/CN2018/106383
Authority: WO
Inventors: 潘铁毅; 胡雪萍; 戚波; 陈世强; 蔡全福; 青雪梅; 刘菁; 吴昊; 叶伟; 吴维双; 张栗晨; 郭瑞兵
Original assignee: 中冶南方工程技术有限公司
Priority date: 2017-09-26
Filing date: 2018-09-19
Publication date: 2019-04-04
Also published as: RU2020114412A; KR20200057055A; CN107502692A; RU2020114412A3

Abstract

A tangential multi-pipeline cyclone dust remover for primary dust removal of blast furnace gas comprises a sealed barrel body (5). The top center of the barrel body (5) is in communication with a gas exhaust tube (4), the bottom of the barrel body (5) is provided with a dust collection bin (8), the upper part of the barrel body (5) is in communication with at least three gas inlet tubes (3) that uniformly distributed around the barrel body (5). The gas inlet tubes (3) are tangential to the outer circle of the barrel body (5), and are in communication with a blast furnace raw gas outlet. A reflection body (6) and a reflection cover (7) that are coaxial with the barrel body (5) are disposed at the lower part in the barrel body (5). The reflection body (6) is in the shape of a cone that is narrow in the upper part and is wide in the lower part or is a cone-column combination. The reflection cover (7) is a conical cover that is wide in the upper part and is narrow in the lower part, is provided with openings in two ends, and encloses the reflection body. A ring-shaped gap for ash is formed between the conical surface of the reflection body (6) and the conical surface of the reflection cover (7). The reflection cover (7) is fixed along the inner wall of the barrel body (5), and the reflection body (6) is mounted on the reflection cover (7) or the barrel body (5) by means of a supporting member. The dust remover has a wide flow-speed range, has a stable cyclone central region, has a high dust removal efficiency, has a simple structure, occupies a small floor space and is convenient to mount.

Description

Tangential multi-circuit cyclone dust collector for blast furnace gas primary dust removal

Technical field

The invention belongs to the field of blast furnace gas dust removal, and particularly relates to a tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal.

Background technique

At present, there are three main schemes for blast furnace crude gas primary dust removal system: 1) gravity dust collector; 2) PW axial cyclone dust collector; 3) gravity dust collector + tangential cyclone dust collector. Among them, the dust removal efficiency of scheme 1) is relatively low, only 40% to 50%; scheme 2) the structure of the deflector is complicated, the installation is inconvenient, and it is easy to be worn and blown off by the high-speed gas flow, often forcing the blast furnace to rest; Option 3) High investment, large floor space, and high requirements for overall layout.

Summary of the invention

The object of the present invention is to provide a tangential cyclone multi-line dust collector for primary dust removal of blast furnace gas, which has a wide flow velocity range and a stable swirling central zone, high dust removal efficiency, simple structure and small floor space. Easy to install.

The technical solution adopted by the invention is:

A tangential cyclone dust collector for primary dust removal of blast furnace gas comprises a closed cylinder body, an exhaust pipe is connected at the center of the top of the cylinder body, and an ash collection bin is connected at the bottom of the cylinder body, and the upper part of the cylinder body is connected with at least three uniforms around the cylinder body. The trachea, the intake pipe and the outer cylinder are tangentially connected and connected to the blast furnace crude gas outlet, and the lower part of the cylinder body is provided with a reflector and a reflector coaxial with the cylinder body, and the reflector is a narrow or wide cone or cone-column assembly. The reflector is a conical cover that is wide and narrow at the upper end, open at both ends, and surrounds the reflector. An annular gray joint is formed between the tapered surface of the reflector and the tapered surface of the reflector. The reflector is fixed along the inner wall of the cylinder, and the reflector passes through. The support member is mounted on the reflector or on the barrel.

Further, the angle between the tapered surface of the reflector and the tapered surface of the reflector is 50 to 60°, and the gap of the annular gray slit is 350 to 800 mm.

Further, the cylinder body is provided with an inspection manhole, and the reflection cover is provided with an inspection passage, and the inspection passage is connected with the inspection manhole and extends to the annular gray joint.

Further, when the bottom end of the reflector is located above the bottom opening of the reflector, the reflector is fixedly connected to the reflector by the support.

Further, when the bottom end of the reflector is located below the bottom opening of the reflector, the reflector is connected to the cylinder by the height of the support member, and an adjustment passage for adjusting the height of the reflector is disposed on the outer circumference of the cylinder.

Further, the inside of the reflector is a cavity.

Further, the inlet end of the intake pipe is in communication with the reducer pipe and the down pipe, the reducer pipe is gradually narrowed toward the cylinder, and the down pipe is connected to the blast furnace crude gas outlet.

Further, the intake pipe is a rectangular pipe.

The beneficial effects of the invention are:

During operation, the crude gas is cut into the cylinder along the intake pipe, and the coarse gas moves spirally downward along the inner wall of the cylinder, and is redirected toward the axis under the reflection of the reflector, and is redirected under the reflection of the reflector. The upper swirling airflow rises from the middle of the cylinder and is discharged through the exhaust pipe, and does not collide with the blast furnace crude gas falling near the inner wall of the cylinder. At the same time, in the process of redirection, the dust particles pass through the ring under the action of gravity. The ash seam enters the ash collecting bin; the invention adopts at least three air inlet pipes, has a wide flow velocity range, and has a stable swirling central zone, and directly performs dust removal on the blast furnace crude gas, and the dust removing efficiency is 70%-80%, which is higher than gravity. 40% to 50% of the dust collector can replace the gravity dust collector, and can separate the dust particles with the particle size larger than 5μm, and leave the zinc present in the small particles in the secondary dust removal ash of the gas, which is convenient for recycling and drying the gas. The Fe, C and secondary dust removal in the ash is more conducive to the recovery of zinc, and effectively reduces the load of the secondary gas dedusting system. The invention connects the blast furnace crude gas outlet through a pipeline, and has a simple structure and safety. Convenient; small footprint of the present invention, does not affect the general layout, the investment can be saved; a support member so that the reflector structure is stable, it does not occur at the wobble impinging airstream, shaking.

DRAWINGS

1 is a schematic structural view of an embodiment of the present invention.

Fig. 2 is a schematic view showing the external connection of the intake pipe of the present invention (only one intake pipe is drawn for convenience of observation).

Figure 3 is a plan view of Figure 2.

In the figure: 1-down pipe; 2-reducing pipe; 3-intake pipe; 4-exhaust pipe; 5-tube; 6-reflector; 7-reflector; 8--ash bin.

Detailed ways

The invention will now be further described with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , in the present embodiment, the tangential cyclone dust collector for the primary dust removal of the blast furnace gas includes a closed cylinder 5, the top of the cylinder 5 is connected with an exhaust pipe 4 at the top, and the bottom is a ash collection bin 8. 5 The upper part is connected in sequence with three air intake pipes 3 uniformly distributed around the cylinder 5 (in fact, it can be added to 4, 5, 6, etc. according to requirements), the reducer 2 and the down pipe 1 (see FIG. 2 and FIG. 3), the intake pipe 3 is tangent to the outer circle of the cylinder 5, the reducer pipe 2 is gradually narrowed toward the cylinder 5, and the downcomer pipe 1 is connected to the blast furnace crude gas outlet (the blast furnace crude gas outlet is generally connected with an outlet pipe and The rising pipe 1 is connected to the blast furnace crude gas outlet through the rising pipe. The lower part of the cylinder 5 is provided with a reflector 6 and a reflector 7 coaxial with the cylinder 5, and the reflector 6 is a narrow upper and lower cone. (The cone-and-column assembly may also be a cone-and-column assembly.) The reflector cover 7 is a conical cover that is wide and narrow at the upper end, is open at both ends, and surrounds the reflector 6. The annular ash is formed between the tapered surface of the reflector 6 and the tapered surface of the reflector 7. The reflector 7 is fixed along the inner wall of the cylinder 5, and the reflector 6 is mounted on the reflector 7 or the cylinder 5 via a support.

During operation, the down pipe 1 is connected with the blast furnace crude gas outlet to introduce coarse gas, and the coarse gas is accelerated along the reducer pipe 2 and then cut into the cylinder 5 through the intake pipe 3, and the coarse gas moves spirally downward along the inner wall of the cylinder 5, The reflection of the reflector 7 is redirected to the axial center, and under the reflection of the reflector 6, the upward swirling airflow is formed. The upper swirling airflow rises from the middle of the cylinder 5 and is discharged through the exhaust pipe 4, not with the cylinder. The blast furnace coarse gas conflicts near the inner wall of the body 5, and at the same time, in the two redirection processes, the dust particles enter the ash collection bin 8 through the annular ash joint under the action of gravity; the invention has a wide flow range and a stable swirl center. District, the blast furnace crude gas directly dedusting, dust removal efficiency of 70% ~ 80%, higher than 40% ~ 50% of the gravity dust collector, can replace the gravity dust collector, can be concentrated to separate dust particles larger than 5μm, The zinc present in the small particles is left in the secondary dust removal ash of the gas, which is convenient for recycling and utilizing Fe and C in the dry gas ash, and the secondary dust removal of the gas is more conducive to the recovery and treatment of the zinc, thereby effectively reducing the secondary gas dedusting system of the subsequent gas. Load The utility model has the advantages of simple structure and convenient installation by connecting the blast furnace crude gas outlet through the pipeline; the invention has small occupied area, does not affect the overall layout, and can save investment; the support member makes the reflector 6 structurally stable, and does not oscillate under the impact of the airflow. Shake.

In the present embodiment, according to the actual dust removal requirement and the dusty condition of the blast furnace crude gas, the angle between the tapered surface of the reflector 6 and the tapered surface of the reflector 7 is designed to be 50-60°, and the gap of the annular gray joint is 350. ~800mm, can achieve the best reflected airflow and facilitate the passage of gas ash.

In the embodiment, the cylinder 5 is provided with an inspection manhole (one or more inspection person holes, the inspection person hole is slightly higher than the reflection cover), and the reflection cover 7 is provided with an inspection passage (the inspection passage is linear or Ring), the access channel is connected to the manhole and extends to the annular crevice. In order to prevent the annular gray joint from being affected by the gas ash blockage and the dust removal effect, the manhole and the inspection passage are set up for manual clearing.

In this embodiment, when the bottom end of the reflector 6 is located above the bottom opening of the reflector 7, the reflector 6 is fixedly connected to the reflector 7 by a support member. When the bottom end of the reflector 6 is located below the bottom opening of the reflector 7, The reflector 6 is connected to the cylinder 5 by the height of the support member. The outer circumference of the cylinder 5 is provided with an adjustment passage for adjusting the height of the reflector. The height of the reflector 6 is adjusted to adjust the size of the annular gray joint to improve the ring shape. The situation where the gray seam is blocked.

In the present embodiment, the inside of the reflector 6 is a cavity, and the weight of the reflector 6 is reduced.

In the present embodiment, the intake pipe 3 is a rectangular pipe which is better rotated downward along the inner wall.

It is to be understood that those skilled in the art will be able to make modifications and changes in accordance with the above description, and all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

A tangential multi-pipe cyclone dust collector for blast furnace gas primary dust removal, characterized in that it comprises a closed cylinder body, an exhaust pipe is connected at the center of the top of the cylinder body, and an ash collection bin is connected at the bottom, and at least three are connected at the upper part of the cylinder body. An air intake pipe uniformly distributed around the cylinder body, the intake pipe is tangent to the outer circle of the cylinder and communicates with the crude gas outlet of the blast furnace, and the reflector body and the reflector cover coaxial with the cylinder body are arranged at the lower part of the cylinder body, and the reflector body is narrow and wide. a cone or a combination of cones and cones, the reflector is a conical cover that is wide and narrow at the upper end, open at both ends, and surrounds the reflector, and an annular gray joint is formed between the tapered surface of the reflector and the tapered surface of the reflector, and the reflector is along the cylinder The inner wall is fixed, and the reflector is mounted on the reflector or the cylinder through the support.
The tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal according to claim 1, wherein the angle between the tapered surface of the reflector and the tapered surface of the reflector is 50-60°, and the annular gray joint The gap is 350 to 800 mm.
The tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal according to claim 1, wherein the cylinder body is provided with an inspection manhole, and the reflection cover is provided with an inspection passage, and the inspection passage is connected with the maintenance manhole. Extend to the annular gray seam.
The tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal according to claim 1, wherein when the bottom end of the reflector is located above the bottom opening of the reflector, the reflector is connected and fixed to the reflector by the support member.
The tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal according to claim 1, wherein when the bottom end of the reflector is located below the bottom opening of the reflector, the reflector is connected to the cylinder by the height of the support member. On the outer circumference of the cylinder, an adjustment passage for adjusting the height of the reflector is provided.
A tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal according to claim 1, wherein the inside of the reflector is a cavity.
The tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal according to claim 1, wherein the inlet end of the intake pipe is in communication with the reducer pipe and the descending pipe, and the reducer pipe is gradually narrowed toward the cylinder body, and is lowered. The pipe is connected to the blast furnace crude gas outlet.
A tangential multi-channel cyclone dust collector for blast furnace gas primary dust removal according to claim 1, wherein the intake pipe is a rectangular pipe.