CN103820635A

CN103820635A - Endless sintering process

Info

Publication number: CN103820635A
Application number: CN201410059047.5A
Authority: CN
Inventors: 邹明
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-02-15
Filing date: 2014-02-15
Publication date: 2014-05-28

Abstract

The invention relates to an endless sintering process. The endless sintering process is characterized in that a finished sinter ore is discharged from the bottom of a sintering container; a mixture is supplemented continuously from the top of the sintering container, so that a combustion zone in a sintering material layer does not interrupt combustion under a normal production state without fault or overhaul, and is in no need of reaching a sintering end.

Description

Endless sintering process

Affiliated technical field

The present invention relates to one and take bottom discharge, the endless sintering process of stationary state, this technology is applied to metallurgical agglomeration technology field.

Background technology

Sintering belongs to a kind of agglomeration process, exactly pulverulent material, fuel are coordinated according to a certain percentage, add water-wet again, mix formation compound, cloth, on agglomerating plant, passes through the bed of material by igniting, air-flow, the high temperature and the series of physical chemical transformation that produce by fuel combustion, generating portion low melting point, and the liquid phase of softening melting generation some amount, get up wetting material particles bonding, after cooling, i.e. the fixed porous block product-agglomerate with some strength that becomes.

Whether divide higher or lower than normal atmosphere from sinter bed air intake pressure on one side, sintering, can be divided into intermittent type and continous way by agglomerating plant form, continuous sintering machine mainly contains two kinds of ring type and belts if can be divided into updraught sintering and down draft sintering.

Our times sintering process is mainly being widely applied aspect iron ore agglomeration, and the sintering processing that iron ore sintering adopts is substantially all exhausting belt sintering.

No matter the various sintering process that are applied on our times, be exhausting form or air blast form, is that intermittent type or continous way all exist sintering end point.The implication of sintering end point is time or the position that sintering process finishes, its concept is exactly that sinter bed surface temperature is heated to bed of material inner fuel and reaches burning-point and take fire, air-flow passes through sinter bed, zone of combustion advances along air flow line, when zone of combustion arrives bed of material the other side, fuel in the bed of material just all burns down, the spent air temperture that goes out sinter bed peaks, for intermittent type sintering, this moment is exactly the sintering end point moment, and for continous way sintering, pallet moves to spent air temperture, and to reach the highest position be exactly sintering end point position.

In metallurgical furnace kiln, iron-smelting blast furnace belongs to disposable igniting, the smelting technology of endless, but can only be used for ironmaking, can not be used for sintering.

Sintering mentioned in this article refers to the agglomeration process that generates liquid phase bonding, and the not sintering of powder metallurgy category, neither flue gas sintering.

Summary of the invention

Existing sintering process all belongs to terminal sintering, and the shortcoming that energy dissipation is large, equipment is complicated, dust discharge is large that has terminal technique to exist has terminal sintering existent defect for solving.The proposition of the invention endless sintering process, so-called endless sintering process is exactly that sintering container is discharged finished product agglomerate below, top constantly supplements compound, make the zone of combustion in sinter bed under the normal production status of trouble free, maintenance, can not interrupt burning, without arriving sintering end point.Because the raw materials for sintering granularity overwhelming majority is all at 0～8mm, ventilative poor, bed thickness is restricted, and easily falls for the reaction area and the material product that guarantee Reasonable Scale, therefore the present invention's application is generally horizontal type structure, and the endless technique of other non-sintering is generally vertical structure.The invention has the beneficial effects as follows:

1) there is terminal continuous sintering machine to need continual igniting, the each terminal of intermittent type sintering completes needs next batch to pack into and expect to light a fire, endless sintering does not need igniting in for a long time completely, therefore can reduce sintering process igniting energy consumption.

2) have terminal sintered discharge gas discharge medial temperature high, endless sintered discharge gas discharge medial temperature is low, arranges consumption outward therefore can relatively reduce the energy.

3) there is the agglomerate finished product temperature of terminal SINTERING PRODUCTION higher, need to carry out after cooling using belt-conveying to arrive user, and the agglomerate finished product temperature of endless SINTERING PRODUCTION is low, can directly use belt-conveying, both reduce outer row's energy consumption, saved again energy consumption and the expense of agglomerate cooling apparatus.

4) have terminal sintering process flow process and equipment relatively complicated, endless sintering process flow process is relative with equipment simple, can reduce sintering investment and operation maintenance expense.

5) the pollutant discharge amount maximum such as dust in the time that sintering end point arrives, therefore endless sintering process is fewer than there being terminal sintering discharge amount of pollution, Environmental Protection Level is higher.

Accompanying drawing explanation

Fig. 1 is endless sintering schematic diagram of the present invention (vertical cross-section).1.---------------------in oxygen containing sinter bed, combustion air current is to, 8.---with the agglomerate drawing mechanism of multilayer gate, 9.---sintered material container bottom bellows for agglomerate falling direction after fragmentation, 7. for sinter bed bottom shredder assembly (just signal of shredder assembly figure does not limit the crumbling method of use), 6. for sintering mine belt, 5. for sintering combustion band (sintering combustion band refer to the zone of combustion of level in compound is seen from cross section be banded), 4. for sinter mixture, 3. for sintered material container outer wall, 2.

Embodiment

The specific embodiment of the invention is as follows:

Press signal in accompanying drawing 1, sinter mixture the same as ordinary sinter packs sintered material container into from top, sintered material container surrounding sidewall is 1. airtight airtight, 5. sintering container bottom has shredder assembly, this device can support sinter mixture in sintered material container, also can see through air-flow (this with general sintering container bottom grid section effect similar).Fill bed material and add thermal material on top 5., making in container the fuel in underlying material reach burning-point takes fire, sinter mixture on cloth thereon again, container manufacture up and down draught head oxygen containing combustion-supporting gas by direction 7., from bottom to top through sintered material container bottom bellows 9., shredder assembly 5. laggard enter the bed of material, 3. complete after combustion-supporting effect at zone of combustion, 2. combustion exhaust is upward through sinter mixture.In compound, after fuel combustion, under combustion air current effect, cooling formation agglomerate is 4. gradually, bring heat into the more compound on top through the air-flow of the bed of material raises its temperature simultaneously, after arriving burning-point, the solid fuel in compound takes fire, so make zone of combustion 3. move up gradually, in the time that 3. zone of combustion moves in sintered material container certain altitude, start the 5. established agglomerate of broken sintered material container bottom of shredder assembly, with the agglomerate drawing mechanism of multilayer gate 8. agglomerate after fragmentation falls into by direction 6., agglomerate can enter normal barometric pressure environment as output of products after 8., after bottom agglomerate is discharged, top sinter mixture 2. charge level sinks, supplementing subsequently sinter mixture makes charge level recover height.In a word, be exactly to discharge agglomerate and top constantly supplements compound by sintered material container bottom is broken, although 3. zone of combustion is constantly moved up, cannot arrive charge level always and finish sintering process, or can say and cannot arrive sintering end point always.

Claims

1. endless sintering process, it is characterized in that: the compound that sintering is housed in container, bottom-heated makes bottom sinter mixture fuel combustion form zone of combustion, again by manufacturing the mode of the upper and lower pressure difference of container, air-flow is passed through from the bottom to top through the sinter mixture bed of material, zone of combustion is moved up gradually, the discharge that is broken of the agglomerate of zone of combustion bottom, charge level declines, bed of material top supplements new compound in time, make the zone of combustion in the bed of material not arrive bed of material surface under normal SINTERING PRODUCTION state, namely do not arrive sintering end point.

2. endless sintering novel process according to claim 1, is characterized in that: shredder assembly is arranged at sintered material container bottom.