CN202090011U

CN202090011U - Sponge iron smelting and solid-phase iron oxide reduction device

Info

Publication number: CN202090011U
Application number: CN2011201714477U
Authority: CN
Inventors: 赵纪波
Original assignee: BEIJING WEIHUA TONGDA TECHNOLOGY DEVELOPMENT CO LTD
Current assignee: BEIJING WEIHUA TONGDA TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2011-05-26
Filing date: 2011-05-26
Publication date: 2011-12-28
Anticipated expiration: 2021-05-26

Abstract

The utility model relates to a sponge iron smelting and solid-phase iron oxide reduction device which comprises a housing and a reactor bed body (3) arranged in the housing, wherein the reaction bed body (3) is made of porous refractory material, and the pore size of the porous refractory material is 5-35mm. Reducing gas and produced hot smoke are introduced into the sponge iron smelting and solid-phase iron oxide reduction device, and flow through the reaction bed body (3) made of porous refractor material. By the improvement, the device disclosed by the utility model has the following effects and advantages: 1) the increased thickness of the material layer is 4-8 times of that of the original material layer, i.e. in a production line with the same investment, the production rate is improved by 4-8 times; 2) the heat efficiency is improved, the unit product cost is reduced, and after the heat efficiency is improved, heat taken away by the discharged hot smoke is only about 25% of that of the original device, and the cost of the fuel can be saved by 75%; and 3) as the discharge temperature is lower than the boiling point of an alkali metal compound, the problem of the bonding of alkali metal can be overcome, and the cost of ton product can be reduced.

Description

A kind of sponge iron is smelted and phase oxidative iron reducing apparatus

Technical field

The utility model relates to the ferrous metallurgy field, and particularly, the utility model relates to a kind of sponge iron and smelts and phase oxidative iron reducing apparatus.

Background technology

In the solid phase reduction smelting technology of iron, reaction unit is for being provided with a reaction bed body at the reaction bed middle part, the top of reaction bed body is provided with a material container, additive such as ferric oxide and reductive agent is by this container splendid attire, its bottom is the refractory materials masonry 7 (as Fig. 3) of atresia, material be heated or reduction process in, hot flue gas that burner 1 (Fig. 3) produces or reducing gas are many based on radiative transfer to material, most high-temperature flue gas directly is disposed to outlet by burning cavity 6 (Fig. 3), caused hot flue gas or reducing gas insufficient to the material heat conduction, thermo-efficiency is lower; In addition, in the conductive process of heat, owing to cause material can only rely on radiation and direct heat conduction to conduct, the convection current conduction ratio is lower, determined that the laying depth of material is little, the burner hearth service efficiency is low, 60% heat is along with hot flue gas is got rid of body of heater, effectively the heat energy utilization ratio is low, cause fuel consumption higher, so the part producing line uses interchanger that the flue gas that effluxes is carried out heat exchange, to improve the heat energy utilization rate, but owing to contain higher dust and lower boiling alkali metal compound in the flue gas, the bonding that causes interchanger makes that production can not continuous production, even if can intermittently produce, owing to use its theoretical heat exchange efficiency of interchanger also to have only 50%, still have 50% thermal waste.

Therefore increasing flue gas or the reducing gas convection heat conduction ratio to material, is to improve heat transfer efficiency, increases the material laying depth, improves the direct valid approach of burner hearth service efficiency.

The utility model content

The purpose of this utility model is to provide a kind of sponge iron to smelt and phase oxidative iron reducing apparatus, the reaction bed body 3 that this device comprises a housing and is arranged on this housing middle part, described reaction bed body 3 adopts poroid refractory materials to make, its pore size is 5～35mm, and less than the particle diameter of reaction mass, the reaction bed body 3 that the hot flue gas of feeding reducing gas and generation is made by poroid refractory materials in the described sponge iron smelting device flows.The flow direction of described hot flue gas or reducing gas is to pass the reaction bed body 3 that the reduzate stockpile enters poroid refractory materials, and flow out from the gas orifice of anti-the material, perhaps earlier enter the reduzate stockpile again by poroid refractory materials, thereby changed the flow direction of hot flue gas and reducing gas, improved heat transfer efficiency.

Described refractory materials is the combination of aluminium matter, siliceous, magnesia one or more, and its heatproof is greater than 1300 ℃.

First flue 4 and second flue 5 of flue gas or reducing gas established in the poroid refractory materials bottom of described reaction bed body 3.

Smelt and phase oxidative iron reducing apparatus according to sponge iron of the present utility model, described poroid refractory materials carries out the reaction bed body of chemical reaction as material, carry out heat exchange for hot flue gas and material condition is provided, and poroid anti-material institute heatproof degree is refractory materials commonly used: aluminium matter, siliceous, magnesia or its connexus of three kinds, heatproof is more than 1300 ℃, and poroid design and to make also be proven technique comparatively, application in metallurgy industry is as honeycomb brick, blast funnace hot blast stove is with checker brick etc., but these poroid high temperature materials are used for heat storage usually, its role is to accumulation of heat and heat release, therefore, the contriver has overcome the technology prejudice that these poroid high temperature materials only are used for accumulation of heat and heat release, the thinking of breaking the normal procedure, in the field of the iron oxide reduction system of being introduced into iron, as the reaction bed body under the condition of high temperature, utilize its airing function, it is insufficient to have solved existing thermal conduction cleverly, the problem that Btu utilization is low, and obtained good effect, make the utilization ratio of heat energy reach more than 85%, the thickness of the material bed increase after the improvement is about former material bed 4-8 doubly, promptly same production line of investing, its productivity has improved 4-8 doubly, thermo-efficiency improves simultaneously, unit cost reduces, and the heat energy that the hot flue gas of discharging is taken away only for about 25% of original device, has been saved 75% fuel cost.

In the utility model, original bottom masonry of anti-the material is replaced by the poroid masonry of anti-the material, reduction reaction is material bed to be thickened, establish flue gas or reducing gas flow passage in anti-material bottom simultaneously, the flow direction of hot like this flue gas or reducing gas flows to the poroid masonry of anti-the material for passing the reduzate stockpile, is perhaps flowed to the reduzate stockpile by the poroid masonry of anti-the material.See flow direction illustrated in figures 1 and 2.Produce in the production line of sponge iron the advantage that develops skill of the outstanding sensible heat efficient of this technology at the rotary hearth furnace solid phase reduction.After the furnace bottom of rotary hearth furnace used the poroid masonry of anti-the material in the utility model, the flow direction of air-flow changed, and when passing material, had improved heat transfer efficiency, had reduced energy consumption, had accelerated the speed of iron ore chemical reduction reaction; Pass the gas of material simultaneously gas, dust that chemical reaction produces are taken away, discharging after dust removal installation purifies.

After adopting poroid reaction bed of the present utility model, the flow direction of hot flue gas changes, make transmission of heat by convection increase to more than 70%, and hot flue gas flowing between reaction bed is the circulation second stage employ, promptly the hot flue gas that comes out after the reaction bed heat exchange enters other place's reaction bed cold burden is heated, and forms the secondary heat exchange of hot flue gas, improve heat exchange efficiency greatly, made the utilization ratio of heat energy reach more than 85%.When the thickness of bank can increase greatly, the convective heat exchange amount between hot flue gas or reducing gas and bank increased greatly, has changed the deficiency that the convective heat exchange amount is few in original technology, heat transfer efficiency is low like this.

By improvement of the present utility model, this device has following effect and advantage:

1) thickness of material bed increase is about former material bed 4-8 doubly, promptly same production line of investing, and its productivity has improved 4-8 doubly.

2) thermo-efficiency improves, and unit cost reduces, and after heat exchange efficiency improved, the heat energy that the hot flue gas of discharging is taken away only for about 25% of original device, had been saved 75% fuel cost.

3) because exhaust temperature is lower than the alkali metal compound boiling point, overcome basic metal agglutinating problem, made and produce the decline of maintenance and repair rate, continuity increases, and production efficiency improves, and the ton product cost reduces.

Description of drawings

Fig. 1 be in the utility model hot flue gas or reducing gas by the reduzate stockpile to the poroid masonry of anti-material mobile front view;

Fig. 2 be in the utility model hot flue gas or reducing gas by the poroid masonry of anti-the material to reduzate stockpile mobile front view;

Fig. 3 is the atresia masonry of anti-a material material implantation front view in original technology.

The accompanying drawing sign

1, fuel burner nozzle 2, reaction mass 3, reaction bed body

4, first flue 5, second flue 6, burning cavity and in line flue

7, atresia reaction bed body

Embodiment

Below in conjunction with accompanying drawing and example embodiment of the present utility model is described in further detail:

Be illustrated in figure 3 as and adopt atresia reaction bed body 7 in original technology, its shortcoming is thin for the material bed of material, the heat exchange of material and hot flue gas or reducing gas is based on thermal radiation and the solid-state heat conduction of material, and most of flue gas is discharged by burning cavity and in line flue 6, thereby causes heat exchange efficiency lower.

Among Fig. 1 and Fig. 2 original bottom masonry of anti-the material is replaced by the poroid masonry of anti-the material, reduction reaction is material bed to be thickened, establish flue gas or reducing gas flow passage in anti-material bottom simultaneously, the flow direction of hot like this flue gas or reducing gas flows to the poroid masonry of anti-the material for passing the reduzate stockpile, is perhaps flowed to the reduzate stockpile by the poroid masonry of anti-the material.See flow direction illustrated in figures 1 and 2.

Fuel burner nozzle 1 burning produces the elevated temperature heat flue gas among Fig. 1, about 1100-1400 ℃, pass by reaction mass 2, conduct the heat transferred material by conduction of convection current main body and small amount of radiation, solid-state ferriferous oxide reduction reaction down takes place, the production metallic iron in the material back that is heated.Hot flue gas after the cooling is by the hole of reaction bed body 3 simultaneously, enter in first flue 4, hot flue-gas temperature in the flue is still higher at this moment, enter the reaction bed body that fills material that needs heating by second flue 5, secondary is the heat transferred material, as shown in Figure 2 (this process also can air flow line as shown in FIG. carry out on the contrary).By that analogy the flue gas in the flue also can be for the third time, enter the material of reacting by heating bed body for the 4th time.

Like this heat of the hot flue gas that produces of burner combustion always can advance may be many material that is lower than its temperature that passes to, make the discharged flue gas temperature low as far as possible, the heat of discharging is also low more.The bed of material of material can improve more than 4 times on the original basis, promptly same production line of investing, and its productivity has improved 4-8 doubly.After heat exchange efficiency improved, the heat energy that the hot flue gas of discharging is taken away only was about 25% of original device.And saved 75% fuel cost.Simultaneously, because exhaust temperature is lower than the alkali metal compound boiling point, overcome basic metal agglutinating problem, made and produce the decline of maintenance and repair rate, continuity increases, and production efficiency improves, and the ton product cost reduces.

Produce in the production line of sponge iron the advantage that develops skill of the outstanding sensible heat efficient of this technology at the rotary hearth furnace solid phase reduction.After the furnace bottom of rotary hearth furnace used the poroid masonry of anti-the material among Fig. 1 and Fig. 2, the flow direction of air-flow changed, and when passing material, had improved heat transfer efficiency, had reduced energy consumption, had accelerated the speed of iron ore chemical reduction reaction.Pass the gas of material simultaneously gas, dust that chemical reaction produces are taken away, discharging after dust removal installation purifies.

It should be noted last that above embodiment is only unrestricted in order to the explanation the technical solution of the utility model.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is made amendment or is equal to replacement, the spirit and scope that do not break away from technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. a sponge iron is smelted and phase oxidative iron reducing apparatus, the reaction bed body (3) that this device comprises a housing and is arranged on this housing middle part, it is characterized in that, described reaction bed body (3) adopts poroid refractory materials to make, its pore size is 5～35mm, and less than the particle diameter of reaction mass, the reaction bed body (3) that the hot flue gas of feeding reducing gas and generation is made by poroid refractory materials in described sponge iron smelting and the solid-state iron oxide reduction device down flows.

2. sponge iron according to claim 1 is smelted and phase oxidative iron reducing apparatus, it is characterized in that, described refractory materials is an aluminium matter, one or more combinations in siliceous, magnesia, and its heatproof is greater than 1300 ℃.

3. sponge iron according to claim 1 is smelted and phase oxidative iron reducing apparatus, it is characterized in that, flue gas or reducing gas mobile first flue (4) and second flue (5) are established in the poroid refractory materials bottom of described reaction bed body (3).