CN218175063U

CN218175063U - System for cooling powder is recycled in rotary hearth furnace processing technology

Info

Publication number: CN218175063U
Application number: CN202222131415.5U
Authority: CN
Inventors: 张浩浩; 胡晓炜; 冯建明; 汪波; 陈珂; 黄丹; 朱飞
Original assignee: China City Environment Protection Engineering Ltd
Current assignee: China City Environment Protection Engineering Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-12-30
Anticipated expiration: 2032-08-12

Abstract

The utility model provides a system that cooling powder was recycled in rotary hearth furnace processing technology, includes cylinder cooler, stirring storehouse and briquetting machine, the exit linkage deironing device of cylinder cooler, the exit linkage powder storehouse of deironing device, the powder storehouse is provided with the binder storehouse side by side, in the exit linkage of powder storehouse and binder had the stirring storehouse of agitator, the exit linkage in stirring storehouse can carry out the briquetting machine of briquetting processing to the mixture according to suitable intensity, size. The utility model presses the cooling powder into qualified blast furnace charging raw materials to return to the blast furnace process for recycling, avoids the high-temperature oxidation and cooling of iron elements in sintering, reduces the energy consumption and the reducing agent consumption in the high-temperature reduction process of the blast furnace, and reduces the energy consumption in the heating process and the consumption of water and protective gas in the cooling process; meanwhile, the iron element is effectively utilized, and the use of other iron-containing raw materials is reduced.

Description

System for cooling powder is recycled in rotary hearth furnace processing technology

Technical Field

The utility model relates to a ferrous metallurgy deals with technical field useless admittedly, especially relates to a system that cooling powder was recycled among rotary hearth furnace processing technology.

Background

In the steel production process, due to the difference of the properties of raw materials, the production process flow, equipment and management level, more or less solid wastes are generated in each production link. Such as sintering machine head ash generated by a sintering process, blast furnace gravity fly ash, cloth bag fly ash and iron house ash generated in a blast furnace iron-making production process, converter coarse-grained sludge, converter fine-grained sludge and converter slag generated in a converter production process, dust sludge generated in an electric furnace production process, iron scale generated in a steel rolling process and the like. The composition of these sludges depends mainly on their origin, but generally contains recyclable components, such as iron, carbon, zinc, lead, etc. The amount of dust and sludge produced is relatively large, and about 50-80 kg of dust and sludge containing iron and zinc is produced for each ton of steel.

The direct rotary hearth furnace process is one of the iron-containing and zinc-containing dust and sludge treatment and resource utilization processes. The method mainly comprises the steps of mixing a binder, carbon powder and zinc-containing dust uniformly and then pelletizing. The carbon-containing pellets are dried and then are loaded into a rotary hearth furnace to be sequentially dried, preheated and reduced, zinc oxide in the pellets is reduced into zinc steam to be discharged along with flue gas, and the zinc steam is subsequently oxidized to form zinc oxide particles which are captured by a bag-type dust collector; the reduced iron exists in the pellets in the form of metallic iron and is discharged by a discharging machine. In order to avoid the iron in the high-temperature pellets from being reoxidized and restored to the previous form after meeting air, the high-temperature pellets are cooled to below 180 ℃ by a cylindrical cooler. The pellet has different properties of burning loss of carbon in the reduction of the rotary hearth furnace, volatilization of low-melting-point elements and expansion of different substances in the cooling process, so that the pellet has a loose structure, part of raw materials fall off from the pellet in a powdery form, and the mass proportion of the powdery materials is about 20-30% of the charged materials under the general condition. The distribution of elements in the powder is similar to that of the cooled pellets, but the powder has insufficient strength and light weight and cannot directly enter an iron-making and steel-making system. At present, the partial materials are returned to a steel mill for sintering and batching or reentered into a rotary hearth furnace for batching for reuse. Although effective elements in the powder are utilized, the powder material is subjected to high temperature, cooling and other processes again, so that the energy consumption is increased, and the operating cost is increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a system that cooling powder was recycled in rotary hearth furnace processing technology, concrete technical scheme is:

the utility model provides a system that cooling powder was recycled in rotary hearth furnace processing technology, includes the cylinder cooler, still includes stirring storehouse and briquetting machine, the exit linkage deironing device of cylinder cooler, the exit linkage powder storehouse of deironing device, the powder storehouse is provided with the binder storehouse side by side, the exit linkage of powder storehouse and binder has in the stirring storehouse of agitator, the exit linkage in stirring storehouse can carry out the briquetting machine of briquetting processing to the mixture according to suitable intensity, size.

Furthermore, the outlets of the powder bin and the adhesive are provided with first metering pumps, and the outlets of the two first metering pumps are respectively connected to the top of the stirring bin.

Furthermore, a second metering pump for quantitatively adding the mixture into the briquetting machine is arranged at an outlet of the stirring bin, and the second metering pump intermittently operates.

Further, the briquetting machine at least comprises a first oil cylinder for pushing the lump materials and a second oil cylinder for briquetting.

Has the advantages that:

the utility model presses the cooling powder into qualified blast furnace charging raw materials to return to the blast furnace process for recycling, avoids the high-temperature oxidation and cooling of iron elements in sintering, and reduces the energy consumption and the reducing agent consumption in the high-temperature reduction process in the blast furnace; compared with the batching procedure of returning to the rotary hearth furnace, the process of heating in the rotary hearth furnace and cooling by the cylindrical cooler is avoided, and the energy consumption in the heating process and the water and protective gas consumption in the cooling process are reduced; meanwhile, the iron element is effectively utilized, and the use of other iron-containing raw materials is reduced.

Drawings

Fig. 1 is an overall schematic view of the present invention.

Fig. 2 is a pressing process diagram of the briquetting machine of the utility model.

Fig. 3 is a schematic diagram of the cake material release of the briquetting machine of the present invention.

In the figure: 1 cylinder cooling machine, 2 deironing devices, 3 powder bins, 4 binder bins, 5 first metering pumps, 6 stirring bins, 7 stirrers, 8 second metering, 9 briquetting machines, 91 first oil cylinders, 92 second oil cylinders, 93 fixed cylinders, 94 movable cylinders, 95 briquetting cylinders, 96 blocking blocks, 97 pressing plates and 10 blowback pipes.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments:

as shown in figure 1, a system for recycling cooling powder in rotary hearth furnace disposal process, including cylinder cooler 1, still include stirring storehouse 6 and briquetting machine 9, the exit linkage deironing device 2 of cylinder cooler 1, the exit linkage powder storehouse 3 of deironing device 2, powder storehouse 3 is provided with binder storehouse 4 side by side, the exit linkage of powder storehouse 3 and binder has in the stirring storehouse 6 of agitator 7, the exit linkage of stirring storehouse 6 can be according to suitable intensity, size the mixture carries out briquetting in the briquetting machine 9 of handling.

Specifically, the cylindrical cooler 1 is an apparatus installed in a rotary hearth furnace disposal process, the cylindrical cooler 1 cools high-temperature pellets to below 180 ℃, the pellets are different in carbon loss during reduction in the rotary hearth furnace, volatilization of low-melting-point elements and expansion characteristics of different substances during cooling, so that the pellets are loose in structure, part of raw materials fall off from the pellets in a powdery form, and the mass ratio of the powdery materials is about 20-30% of the materials fed into the furnace in general. The distribution of elements in the powder is similar to that of the cooled pellets, and the powder is lighter in weight and directly enters the iron removal device 2 from the bottom outlet of the cylindrical cooler 1.

The iron removing device 2 is a conventional device for recycling solid wastes in the steel smelting industry, iron elements in reduced and cooled powder are enriched by utilizing the characteristic that magnets adsorb iron products, the enriched iron elements are returned to the steel converter, and most of residual powder materials are Fe without magnetism ₂ O ₃ And the cooling powder enters a subsequent powder bin 3, is pressed with a binder into block materials, returns to a blast furnace of a steel mill, and is reduced into metallic iron under the reducing atmosphere of the blast furnace so as to be utilized. The iron removing device 2 at least comprises an electromagnet, a rack, a driving motor, a driving roller, a driven roller and the like.

In this embodiment, the outlets of the powder bin 3 and the binder are provided with first metering pumps 5, and the outlets of the two first metering pumps 5 are respectively connected to the top of the stirring bin 6. The rotating speeds of the two first metering pumps 5 are respectively set, so that the powder and the adhesive can be adjusted and set to be added into the stirring bin 6 according to a certain proportion for mixing and stirring uniformly.

Wherein, the binder can be organic binder and inorganic binder, the organic binder is tar, syrup and the like, and the inorganic binder is bentonite and the like; the binders used in the system are starches.

Preferably, the binder can be corn starch, and the mass percentage of the corn starch in the mixture is 3% -5%.

In this embodiment, the outlet of the stirring bin 6 is provided with a second metering 8 pump for quantitatively adding the mixture into the briquetting machine 9, and the second metering 8 pump is operated intermittently. The uniformly stirred powder and the adhesive are metered by a second metering 8 pump and then added into a briquetting machine 9 for briquetting treatment; according to the period of briquetting treatment by the briquetting machine 9, the intermittent operation time of the second metering 8 pump matched with the period can be set, and the start and stop of the second metering 8 pump are realized by using pulse signals. The bottom of the stirring bin 6 is provided with a blowback pipe 10 in an upward inclined manner, so that the mixture is prevented from bridging and blocking in the stirring bin.

The briquetting machine 9, a first oil cylinder 91, a second oil cylinder 92, a fixed cylinder 93, a movable cylinder 94, a briquetting cylinder 95, a stop block 96 and a pressing plate 97

As shown in fig. 2-3, the working process diagram of a briquetting machine 9 used conventionally is shown, the briquetting machine 9 at least includes a first oil cylinder 91 for pushing lump materials and a second oil cylinder 92 for briquetting, the second metering 8 pump conveys the mixture into a charging barrel arranged on the briquetting machine 9, wherein the charging barrel is divided into three sections, namely a fixed barrel 93, a movable barrel 94 and a briquetting barrel 95 from top to bottom, the first oil cylinder 91 is connected to the outer wall of the movable barrel 94, and a stop block 96 matched with the outer diameter of the charging barrel is arranged on the outer wall of the movable barrel 94 opposite to the first oil cylinder 91. The initial position of the first oil cylinder 91 enables the movable cylinder 94 to be spliced with the fixed cylinder 93 and the briquetting cylinder 95, so that mixture can be received into the briquetting cylinder 95; the second oil cylinder 92 is arranged right below the pressing block cylinder 95, and a pressing plate 97 is arranged at the top end of the second oil cylinder 92. When the driving rod of the first oil cylinder 91 moves towards the right side and the stop block 96 is covered on the top surface of the briquetting cylinder 95, the driving rod of the second oil cylinder 92 moves upwards and presses the mixture by using the pressing plate 97, so that the mixture is extruded to form cake materials to meet the feeding requirement of the blast furnace; the driving rod of the first oil cylinder 91 continues moving rightwards, so that the blocking block 96 is completely moved out of the briquetting cylinder 95, the driving rod of the second oil cylinder 92 pushes upwards, so that the cake material is pushed to just push out of the briquetting cylinder 95 completely, the driving rod of the first oil cylinder 91 is controlled to move leftwards, the cake material is pushed out, the first oil cylinder 91 and the second oil cylinder 92 are controlled to reset, and the cake material pressing process is completed.

It should be noted that the above-mentioned equipment and facilities can be supported and fixed on a platform, a wall, etc., and will not be described in detail herein. The structure of the briquetting machine 9 is described only for the main components thereof, and since the briquetting machine 9 is a conventionally used apparatus, the detailed construction thereof is not described herein, including a support structure for supporting each component, a guide rail for guiding the movement of the movable cylinder 94, and the like.

When the device is used, powder coming out of the cylinder cooler 1 is enriched in iron elements through the iron removal device 2, the rest powder enters the powder bin 3 and is uniformly mixed with the adhesive in the stirring bin 6 according to a certain proportion, the mixture is metered and then enters the briquetting machine 9 to be briquetted intermittently, and the briquetted cake material is loaded on a truck and sent to a blast furnace process for recycling.

Claims

1. The utility model provides a system that cooling powder recycled in rotary hearth furnace processing technology, includes cylinder cooler, its characterized in that: still include stirring storehouse and briquetting machine, the exit linkage deironing device of cylinder cooler, the exit linkage powder storehouse of deironing device, the powder storehouse is provided with the binder storehouse side by side, the exit linkage of powder storehouse and binder is in the stirring storehouse that has the agitator, the exit linkage in stirring storehouse can carry out the briquetting machine that the mixture was handled according to suitable intensity, size to the briquetting machine.

2. The system for recycling the cooling powder in the disposal process of the rotary hearth furnace according to claim 1, wherein: the powder bin and the binder are provided with first metering pumps at outlets, and the outlets of the two first metering pumps are respectively connected to the top of the stirring bin.

3. The system for recycling the cooling powder in the disposal process of the rotary hearth furnace according to claim 1, wherein: and a second metering pump for quantitatively adding the mixture into the briquetting machine is arranged at an outlet of the stirring bin, and the second metering pump intermittently operates.

4. The system for recycling the cooling powder in the disposal process of the rotary hearth furnace according to claim 3, wherein: the briquetting machine at least comprises a first oil cylinder for pushing lump materials and a second oil cylinder for briquetting.

5. The system for recycling cooling powder in the rotary hearth furnace disposal process according to claim 1, wherein: and a blowback pipe is obliquely arranged at the bottom of the stirring bin upwards.