CN2238259Y

CN2238259Y - Coal powder distributor for blast furnace

Info

Publication number: CN2238259Y
Application number: CN 95206854
Authority: CN
Inventors: 董玉贵
Original assignee: Central Iron and Steel Research Institute
Current assignee: Central Iron and Steel Research Institute
Priority date: 1995-03-29
Filing date: 1995-03-29
Publication date: 1996-10-23
Anticipated expiration: 2005-03-29

Abstract

The utility model relates to field of solid powder distributing apparatus, which provides a coal dust distributor for a blast furnace. The distributor is composed of a coal dust input tube, a distributing drum, distributing nozzles, an abrasion-proof flat panel, a flange cover, a flange plate and a suspension loop, wherein the upper end of the coal dust input tube extends into the bottom center and fixed on of the cavity of the distributing drum. Six or more than six distributing nozzles are uniformly assembled on the side wall of the distributing drum; the abrasion-proof flat panel is fixed to the top of the cavity of the distributing drum by the flange cover. The distributor has the advantages of simple structure, and uniform and accurate coal dust distribution.

Description

The blast furnace pulverized coal distributor

The utility model relates to the field of pressed powder distribution device.When mainly being applicable to pulverized coal injection in blast furnace to the distribution of coal dust.

Blast furnace is when coal injection, and normally gas (comprising oxygen) is carrier, and coal dust is imported pulverized coal distributor by transport pipe, after the divider uniformly distributing, coal dust is passed to each air port of blast furnace by many bye-passes, and then sprays in the blast furnace burner hearth.In order to improve the effect of pulverized coal injection in blast furnace, require divider to distribute coal dust evenly, quantitatively and accurately, and require long service life.

The described pulverized coal injection in blast furnace divider of Chinese patent ZL88204417.6 is a kind of cone-shaped divider, between shell and cone, be distributed with several and distribute cutter, distribute and form doline coal dust passage between the cutter, the aditus laryngis through hole that one correspondence is arranged under each passage, connect arm under the through hole again, directly pass to each blast-furnace tuyere.This device is a sendout of controlling coal dust by the aditus laryngis through hole of changing different diameter.The shortcoming of this device is a complex structure, when adjusting the coal injection amount especially, needs to change the aditus laryngis through hole, operation inconvenience; In addition, distribute cutter and aditus laryngis through hole to be easy to be worn, be difficult to guarantee assignment accuracy.

The purpose of this utility model is to provide a kind of blast furnace pulverized coal distributor simple in structure, that assignment accuracy is high.

At above-mentioned purpose, the utility model has adopted following technical scheme:

This pulverized coal distributor adopts beveled structure, promptly distribute drum to adopt inverted garden frustum cavity configuration, linking to each other with the coal dust input tube below the cavity communicates, and the cavity top is equipped with wear-resisting smooth plate, the cavity side is provided with several distribution and chews, and distributes to chew with coal dust branch transfer line to join again.Coal dust is entered from bottom to up by the coal dust input tube and distributes in the drum cavity, and vertically rush on the wear-resisting smooth plate, be even shape then and disperse shunting to all around, be full of pulverized coal flow in the whole distribution drum cavity, because the pressure in the coal dust branch transfer line that each distribution is chewed and is attached thereto is lower than the pressure that distributes in the drum cavity, make pulverized coal flow import each naturally and distribute and to chew, and transport to each air port of blast furnace thereupon, reach the purpose of accurate distribution pulverized coal conveying.

Compared with prior art, the utlity model has following advantage:

(1) owing to the effect of carrier gas, entering the pulverized coal flow that distributes in the drum cavity is that uniform distribution flows, and keeps running balance, therefore, utilize the coal dust input tube and each distribution is chewed and branch line in pressure reduction, pulverized coal flow just enters each very naturally equably and distributes and chew, and makes coal dust distributed uniform, accurately.

(2) coal gas operational throughput or injecting coal quantity can be regulated arbitrarily by the pressure of carrier of control pulverized coal conveying, and not only processing ease, and operational throughput is also accurate.

(3) simple in structure, be convenient to maintenance, distribute wear-resisting smooth plate above the drum cavity severity that is hit, after wearing up to a certain degree, but the demolition ring flange is changed wear-resisting smooth plate, and it is convenient to implement.

Now the utility model is described in further detail in conjunction with the accompanying drawings.

Accompanying drawing 1 is the structural representation of the utility model blast furnace with pulverized coal distributor.

Accompanying drawing 2 is the A-A diagrammatic cross-section in the accompanying drawing 1.

In above-mentioned two figure, 1 is the coal dust input tube, and 2 for distributing drum, and 3 is to distribute to chew, and 4 is wear-resisting smooth plate, and 5 is blind flange, and 6 is ring flange, and 7 is hanging ring.

The lower end of coal dust input tube 1 links to each other with ring flange 6, the upper end puts in the cavity bottom center of distributing drum 2, and fix on it, in addition, in order to make coal dust form the pulverized coal flow that uniform distribution flows within it, require coal dust input tube 1 to have enough length L, promptly require L 〉=20D (D is the internal diameter of coal dust input tube 1), also require the cross-sectional area of coal dust input tube 1 to be less than or equal to the summation that 3 cross-sectional area is chewed in all distribution simultaneously.Distributing drum 2 is inverted garden frustum cavity, and upper and lower faces is parallel, sidewall and last planar angle β≤and 60 °.Distribute and to chew 3 and be inside and outside two-layer garden tube structure, have at least distribution more than 6 or 6 to chew 3 and be assemblied in equably on the sidewall that distributes drum 2, distribute the formed angle α of axis that chews 3 axis and whole pulverized coal distributor≤60 °; Wear-resisting smooth plate 4 is fixed on the top of distributing drum 2 cavitys by blind flange (5); Hanging ring 7 on the blind flange 5 is used for whole pulverized coal distributor is hung at the blast furnace stack platform.Wear-resisting smooth plate 4 and distributing is chewed 3 internal layer and is made by high-abrasive material.

At first coal dust enters coal dust input tube 1 under the drive of carrier gas, because this pipeline has enough length, coal dust is formed evenly in its pipe to flow, evenly the mobile pulverized coal flow vertically is flushed on the wear-resisting smooth plate 4, and thereupon towards periphery the space evenly shunt, form equally distributed pulverized coal flow at the cavity of whole distribution drum 2, and under the effect of air pressure, enter each distribution simultaneously and chew 3, be passed to each air port of blast furnace by branch line.

Claims

1, a kind of blast furnace pulverized coal distributor comprises the coal dust input tube, distributes drum and distribution to chew, and it is characterized in that:

[1] this pulverized coal distributor is chewed (3), wear-resisting smooth plate (4), blind flange (5), ring flange (6) and hanging ring (7) and is formed by coal dust input tube (1), distribution drum (2), distribution;

[2] distributing drum (2) is inverted garden frustum cavity, and upper and lower faces is parallel, sidewall and last planar angle β≤and 60 °;

[3] length L of coal dust input tube (1) 〉=coal dust input tube internal diameter * 20;

[4] distribute and to chew (3) and be inside and outside two-layer garden tube structure;

[5] lower end of coal dust input tube (1) links to each other with ring flange (6), and the center of distributing drum (2) cavity bottom is stretched in the upper end, and fixes on it; Distribution is chewed (3) and is assemblied in equably on the sidewall that distributes drum (2), and wear-resisting smooth plate (4) is fixed on the cavity top of distributing drum (2) by blind flange (5).

2, divider according to claim 1 is characterized in that distributing quantity 〉=6 of chewing (3); Angle α≤60 that longitudinal center line became ° of distributing the axis chew (3) and whole divider.

3, divider according to claim 1 is characterized in that wear-resisting smooth plate (4) and distribution chew the internal layer of (3) and make by high-abrasive material.