CN200946981Y

CN200946981Y - Furnace for producing reduced iron

Info

Publication number: CN200946981Y
Application number: CN 200520092063
Authority: CN
Inventors: 张秋良
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-05
Filing date: 2005-08-05
Publication date: 2007-09-12
Anticipated expiration: 2015-08-05

Abstract

The utility model relates to a stove used in producing reduced iron. The stove is composed of an annular kiln or a down draft kiln and a retort positioned in the annular kiln or the down draft kiln for filling iron powder and solid carbon reducer. A ventilation system is arranged in the annular kiln or the down draft kiln. The stove proposed in the utility model can utilize the current banned brick kiln to produce reduced iron only through simple reconstructions. Thus, the utility model can not only save a large amount of fund in stove construction but make the cost of the reduced iron producing very low and ensures a product quality completely in line with the national standards.

Description

Produce the used kiln of reduced iron

Technical field:

The utility model relates to a kind of used kiln of reduced iron of producing.

Background technology:

It is the cavernous blank of low-carbon (LC) that is obtained by the mode of the smart powder of iron by direct reduction that reduced iron also is referred to as sponge iron, because the chemical composition stability of this kind blank, and impurity content is few, usually with the preferred or indispensable raw material of reduced iron as smelting high-quality steel or special steel.In the prior art, produce reduced iron and mainly adopt two kinds of methods: the first utilizes gaseous fuels such as natural gas or coal gas to produce reduced iron as reducing agent, in this gas base reducing process, because the gaseous fuel price is higher relatively, and the fuel that is consumed in reduction process is more, so, seldom adopt this kind method to produce reduced iron in the deficient zone of gaseous fuel; It two is to adopt solid reductant such as coal to produce reduced iron, i.e. coal base reduction method.In known coal base reduction method, adopting tunnel cave or rotary kiln usually is that main body is produced reduced iron.

Being called " a kind of method of producing DRI " as the name of No. 1037193 Granted publications of Chinese patent is exactly to utilize rotary kiln to produce the example of reduced iron.Have characteristics such as the higher and labour intensity of mechanization degree is lower though adopt rotary kiln to produce reduced iron, but, producing problem that reduced iron at first reflects with it is because the kiln body adopts is arc-shaped structure, cause the roasting road in it also to form circular arc, to pile up the chassis that responds jar current and the roasting road of circular arc must be satisfied with, so require the kiln body to have big relatively volume, giving puts up a kiln brings bigger investment; Though it is big that next is the volume of rotary kiln, but because retort is to be input in the roasting road by the chassis that moves, and the chassis and the retort of being carried thereof can not take the big relatively space in roasting road or firing chamber, so, use the production efficiency and the thermal efficiency of rotary kiln production reduced iron all lower, and cause the raising of production cost; In addition, because rotary kiln is subjected to himself structural limitations, raw material and reducing agent are required harshness, and this requirement can further improve production cost.

Producing reduced iron with the canned method of tunnel cave is generally adopted in the prior art.Tunnel cave has the roasting road of a bar shaped, when producing reduced iron, at first fine ore, coal dust, agstone are respectively charged in the retort according to certain ratio and loading method, then retort is placed on the chassis, again chassis is pushed in the bar shaped roasting road from kiln hood continuously together with retort, and, finish reduction process to iron powder through behind preheating section, reduction section, the insulation slow cooling section.But, because the roasting road must guarantee chassis and normally advance, cause between the sidewall of roasting road and tunnel cave and must leave enough spaces, and the burner port of tunnel cave is arranged on along on the wall of two sidewalls of its length direction or on the furnace roof, make one section long distance is arranged between burner port and the retort, so, utilizes tunnel cave to produce reduced iron and adopt gas such as coal gas or heavy oil or liquid fuel that the firing chamber is heated usually, and the relative coal cost of gas or liquid fuel is higher.In addition, the cost of built tunnel kiln is also higher relatively, according to statistics, a newly-built tunnel cave of producing 10000 tons per year, its investment is about 4,000,000 yuan.

Existing annular kiln or down-draft kiln all are the kilns that are used to produce brick and tile.At first to make through the klining knot again owing to produce brick and tile, not only ruin the field, destroy and plough, but also waste coal equal energy source pollute surrounding enviroment with this klining knot brick and tile by pick cultivated land clay.For this reason, existing state administration department is in a planned way phasing out with annular kiln or down-draft kiln and is producing brick and tile, in case and brick and tile kiln is cancelled, annular kiln or down-draft kiln just become the refuse that takies than large space, and the unique energy of prior art solution be exactly that it is removed, and promptly also finds to utilize the annular kiln of firing brick-and tile or any technology enlightenment that down-draft kiln is produced reduced iron in the prior art.

Summary of the invention:

Task of the present utility model provides a kind of structure of existing annular kiln or down-draft kiln of utilizing and produces reduced iron or utilize brick and tile kiln existing and that go out of use to become the kiln of producing reduced iron after transforming.

The used kiln of production reduced iron that the utility model proposed comprises that liner is installed or changes to be had the annular kiln or the down-draft kiln of refractory material and puts or pile up the retort that is used for splendid attire iron powder and solid carbonaceous reducing agent in described annular kiln or down-draft kiln according to the order of sequence, and the interval preset distance be arranged on the wicket that is used to load and unload retort of annular kiln or down-draft kiln sidepiece; In annular kiln or down-draft kiln, ventilating system is installed.

Described annular kiln comprises two parallel and straight kiln sections preset distance at interval and the arc kiln section that is arranged on described straight kiln section two ends, is being provided with the roasting road of annular in straight kiln section and arc kiln section, and forms a firing chamber between adjacent two wickets.The ventilating system of described annular kiln comprises and is arranged between two straight kiln sections or the main chimney flue of top or bottom and the blower fan and the chimney that communicate respectively with this main chimney flue head and the tail, and the branch flue that leads to described each firing chamber and be communicated with by valve gear with main chimney flue.Described branch flue is installed in the below of flue collector and is connected with flue collector, and each branch flue all is communicated with the firing chamber at its place by pipe fitting.

Described retort be by refractory material or inner surface be make by refractory material and upper surface be open crucible, the face shaping of this crucible is cylinder or prismatic body or important actor body.Be respectively arranged with wicket on the lateral wall of described two arc kiln sections.

The kiln that the utility model proposed is used to produce reduced iron can utilize is existingly banned brick and tile kiln and just can be produced reduced iron by simple transformation, not only can save a large amount of funds of putting up a kiln, and just produce about 1/3rd of reduced iron cost with tunnel cave with the required cost of reduced iron that this kind kiln is produced; From its product quality, the reduced iron of producing with kiln that the utility model proposes and method after testing (with the iron powder of iron content about 67%) to go out every technical indicator as follows: C 〉=0.04%, S＜0.01%, P＜0.02%, SiO2＜3%, MFe 〉=86%, TFe 〉=92%M 〉=92% meets the standard of the reduced iron of national defined fully.

Description of drawings:

Accompanying drawing 1 is the cut-away section structural representation through an embodiment of improved annular kiln;

Accompanying drawing 2 is that cross-sectional view is looked on the left side of Fig. 1;

Accompanying drawing 3 is that Fig. 1 overlooks the cut-away section structural representation;

Accompanying drawing 4 is through the cross-sectional view of an embodiment of improved down-draft kiln.

The specific embodiment:

Referring to Fig. 1 to Fig. 3, these three accompanying drawings provide the overall appearance structure of the embodiment of annular kiln that the utility model proposes.Usually parallel and straight kiln section 1 at interval preset distance and the arc kiln section 2 that is arranged on described straight kiln section two ends constitute described annular kiln by two, and the length of straight kiln section 1 is equipped with main chimney flue 31 much larger than the length of arc kiln section 2 between two straight kiln sections 1.Be provided with roasting road 4 in straight kiln section 1 and the arc kiln section 2, and roasting road 4 is an annular in kiln.In order to make iron powder in course of reaction, can realize preheating, roasting, to cool off this three phases, also consider simultaneously from energy-conservation aspect, on the straight kiln section 1 of each bar and be provided with at interval row's wicket 11 equidistantly, the opening of this wicket 11 all toward the outer side, and between adjacent two wickets 11, be defined as or form a firing chamber, and on each arc kiln section 2, be respectively arranged with a wicket 11.The ventilating system 3 of annular kiln can adopt multiple structure to realize, under normal conditions, ventilating system 3 comprises main chimney flue 31 and the blower fan that communicates respectively with this main chimney flue 31 head and the tail and chimney (because of blower fan and chimney are known technologies, do not provide its concrete structure in the accompanying drawing), and the branch flue 33 that leads to each firing chamber and be communicated with by valve gear 32 with main chimney flue 31.In the present embodiment, main chimney flue 31 is set at the lower area of kiln, also can adopt the structure that is arranged on kiln top or central region certainly.Described branch flue 33 comprises and is connected with main chimney flue 31 and leads to vertical minute flue 331 on kiln top and be connected with this main chimney flue 31 and thereunder three smoke uptakes 332 are set, and one end be connected respectively with two sides of three smoke uptakes 332, the other end leads to the pipe fitting 333 in the firing chamber, and on the vertical top of flue 331 of dividing valve gear 32 is installed, when valve gear 32 is opened, can be firing chamber's air-supply at these valve gear 32 places.

Referring to Fig. 4, this figure provides the overall appearance structure through an embodiment of improved down-draft kiln.As can be seen from Figure 2, it is cylindrical 51 that this down-draft kiln 5 has a lower area, and upper area is semicircle 52 hollow body, and is provided with 4 wickets 53 below cylindrical 51.

In the foregoing description 1 and 2 institute's retort be by refractory material or inner surface be make by refractory material and upper surface be open crucible, the face shaping of this crucible is cylinder or prismatic body or important actor body.

Claims

1, a kind of used kiln of reduced iron of producing, it is characterized in that: this kind kiln comprises that liner is installed or changes to be had the annular kiln or the down-draft kiln of refractory material and puts or pile up the retort that is used for splendid attire iron powder and solid carbonaceous reducing agent in described annular kiln or down-draft kiln according to the order of sequence, and the interval preset distance be arranged on the wicket that is used to load and unload retort of annular kiln or down-draft kiln sidepiece; In annular kiln or down-draft kiln, ventilating system is installed.

2, kiln according to claim 1, it is characterized in that: described annular kiln comprises two parallel and straight kiln sections preset distance at interval and the arc kiln section that is arranged on described straight kiln section two ends, in straight kiln section and arc kiln section, be provided with the roasting road of annular, and between adjacent two wickets, form a firing chamber.

3, kiln according to claim 1 and 2, it is characterized in that: the ventilating system of described annular kiln comprises and is arranged between two straight kiln sections or the main chimney flue of top or bottom and the blower fan and the chimney that communicate respectively with this main chimney flue head and the tail, and the branch flue that leads to described each firing chamber and be communicated with by valve gear with main chimney flue.

4, kiln according to claim 3 is characterized in that: described branch flue is installed in the below of flue collector and is connected with flue collector, and each branch flue all is communicated with the firing chamber at its place by pipe fitting.

5, kiln according to claim 1 is characterized in that: described retort be by refractory material or inner surface be make by refractory material and upper surface be open crucible, the face shaping of this crucible is cylinder or prismatic body or important actor body.

6, kiln according to claim 2 is characterized in that: be respectively arranged with wicket on the lateral wall of described two arc kiln sections.