CN2224847Y

CN2224847Y - Multi-stage blast furnace

Info

Publication number: CN2224847Y
Application number: CN 95236094
Authority: CN
Inventors: 韦瑞生
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-01-16
Filing date: 1995-01-16
Publication date: 1996-04-17
Anticipated expiration: 2005-01-16

Abstract

The utility model relates to an ironmaking blast furnace, particularly a multi-stage ironmaking blast furnace, comprising a furnace body. The top of the furnace body is provided with a feed port, and a furnace hearth arranged at the lower part of the furnace body is provided with a hot blast inlet, a slag notch and an iron notch, wherein, the middle lower part of the furnace body is provided with an air inlet so as to make the upper part of the air inlet form a heating zone; furnace charge in the heating zone realizes physical and chemical processes of decomposition, dehydration, heating, etc., which prepares well for the reduction of the furnace charge; metallic furnace charge after basically reduction enter a melting zone. With little heat consumption, and high melting speed, the utility model enhances the yield of unit furnace smelting, makes full use of furnace smelting, and enhances the utilization rate of gas.

Description

Folded formula iron-smelting blast furnace

The utility model relates to a kind of iron-smelting blast furnace, specifically is folded formula iron-smelting blast furnace.

Existing iron-smelting blast furnace, because its furnace inner space scope is bigger, and the body of heater bottom only has hot-wind inlet, make that the required temperature in smelting process reduction zone is not enough, thereby cause the furnace charge that enters in the reduction zone thoroughly not reduce, reduction not exclusively enters the melting area and directly reduces FeO and consumed a large amount of heat, the reducing gas utilization ratio is not high, and the heat size utilization coefficient is low.

The purpose of this utility model is improved existing iron-smelting furnace exactly and is designed to a kind of folded formula iron-smelting blast furnace, makes reduction thoroughly, and burn-off rate is fast, the output height, and metallurgical effect is good.

The technical solution of the utility model is: comprise body of heater, at the top of body of heater opening for feed is arranged, have hot-wind inlet on the cupola well of body of heater bottom, cinder notch and iron notch wherein have gas inlet in the middle and lower part of shaft.

Describe in detail below in conjunction with the embodiment accompanying drawing.

At first accompanying drawing is described;

Fig. 1 represents structural representation of the present utility model.

As shown in Figure 1, at the top of body of heater (1) charging aperture (2) is arranged, the stove in body of heater (1) bottom Have hot-wind inlet (1), cinder notch (6) and tapping hole (5) on the cylinder, feature of the present utility model is Have air intake (3) in the middle and lower part of shaft, like this, the top of air intake (3) forms and adds Hot-zone A, the bottom is followed successively by reducing zone B and fusion zone C, and air intake (3) is divided into two sections with body of heater, Resembling two stoves is stacked. Its design principle and the course of work are that furnace charge enters from charging aperture (2) In the shaft, high pressure is blown into normal temperature or high temperature air and the coal gas that rises mixes from entrance (3) And burning, make the above thermal treatment zone that forms of air intake (3), the furnace charge that enters in the stove is heated to Reduce required temperature (about 1000 ℃), make furnace charge at this regional inner drying, remove the crystallization water, The decomposition of flux, and have the partial oxide furnace charge in the A of the thermal treatment zone, to reduce, for furnace charge advances Entering reducing zone B reduces and performs necessary preparation. Enter high-temp. furnace material and the rising of reducing zone B Further progressively reduction after the contact of coal gas of high temperature unhitch because flux has divided at thermal treatment zone A Bundle is so have higher reducing gas concentration and the more stable required temperature of reduction in the B of reducing zone. Substantially finish the metal charge of reduction and a small amount of oxide furnace charge and fall into fusion zone C, to cupola well Heat loss is little, and burn-off rate is fast, is conducive to furnace condition anterograde, improves the heat size usage factor.

It is some that air intake of the present utility model (3) is provided with 1-2 rows according to the height of body of heater (1) Individual. Thereby make metallurgical effect reach best.

The folded formula blast furnace that the utility model provides is simple in structure, reasonable in design, owing to arrange There is air intake to form the thermal treatment zone, so that furnace charge has been finished decomposition, dehydration, heating in this district Deng physics, chemical process, for reduction performs necessary preparation, the metal charge that basic reduction is good Enter in the fusion zone, because heat dissipation is few, burn-off rate is fast, and the molten output of the unit's of making stove is improved, Take full advantage of heat size, improved the utilization rate of coal gas.

Embodiment:

Body of heater of the present utility model (1), opening for feed (2), hot-wind inlet (4), cinder notch (6) He Tiekou (5) are prior art constructions, and gas inlet (3) is positioned at the middle and lower part of shaft, and the size of gas inlet (3) is decided according to the size of heat size.

Claims

1, a kind of folded formula iron-smelting blast furnace comprises body of heater, wherein at the top of body of heater opening for feed is arranged, and has hot-wind inlet, cinder notch and iron notch on the cupola well of body of heater bottom, it is characterized in that having in the middle and lower part of shaft gas inlet (3).