CN218146786U

CN218146786U - Concise fly ash cyclic utilization system of LF stove

Info

Publication number: CN218146786U
Application number: CN202221895155.2U
Authority: CN
Inventors: 富志生
Original assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Current assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2022-12-27
Anticipated expiration: 2032-07-22

Abstract

The utility model relates to a metallurgical solid useless resource utilization technical field specifically is a LF stove refining dust removal cyclic utilization system, be connected with dusty flue gas pipeline on the refining ladle top surface, the dust remover exit end is connected with the ash discharging device, the last ash unloading pipeline that is connected with of ash discharging device, the one end that the ash discharging pipeline kept away from the ash discharging device is connected at scraper blade ash conveyor feed end, scraper blade ash conveyor discharge end is connected on the dust removal ash bin, the dust removal ash bin exit linkage is on the refining ladle, the bucket elevator is connected between scraper blade ash conveyor and dust removal ash bin, through scraper blade ash conveyor and bucket elevator, the refining dust removal that collects the dust remover recycles in the LF refining stove; the utility model has simple structure; the method avoids the pollution of the environment caused by the separation of toxic and harmful gases after the chemical substances in the fly ash and water are subjected to chemical reaction in the fly ash discharging and humidifying process; the transportation cost of the fly ash is saved, the refining cost is reduced, and the high-added-value recycling of secondary resources is realized in a true sense.

Description

Concise fly ash cyclic utilization system of LF stove

Technical Field

The utility model relates to a metallurgical solid useless resource utilization technical field specifically is a concise dust removal cyclic utilization system of LF stove.

Background

The LF furnace is a standard configuration of a modern steel-making refining process, the refining fly ash of the LF furnace is 2.5-4 Kg/t steel, and the main components are FeO, caO and SiO ₂ And the like, which belongs to metallurgical solid wastes, and is a valuable available resource. In the prior art, the LF furnace refining fly ash is usually transported to a sintering process by using an automobile and is added into raw materials for use, the refining fly ash is mostly powder with extremely small particles, the calcium content is higher, a pellet pressing process is used for manufacturing pellets, if other materials such as a binder and the like are not added, the strength of the pressed pellets is obviously insufficient, the use stability is poorer, the crushing probability is greatly improved in the transportation and use processes, and if other materials are added, the production cost is obviously improved; in addition, the refining furnace dust removal ash has relatively high alkali metal content, harmful elements in the dust removal ash are difficult to eliminate in the sintering process, the production stability of the blast furnace is influenced, the addition amount is limited, and the utilization value of the LF furnace refining dust removal ash is low.

In addition, the refining fly ash has extremely small particles, humidification is carried out during ash discharge, and chemical substances in the fly ash and water react chemically in the humidification process to separate out H ₂ S、C ₂ H ₂ 、PH ₃ And the like, causing serious environmental pollution.

However, the refined fly ash is rich in beneficial elements such as Fe, ca and the like, and can be applied to the steel-making link as a deoxidizer, a desulfurizer, a covering agent and the like, so that in recent years, metallurgical workers actively explore a new way for high added value utilization of the fly ash in the remelting process.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a concise dust removal ash cyclic utilization system of LF stove makes the concise dust removal ash of LF stove admittedly useless and does not dispatch from the factory, realizes dust removal ash remelting utilization.

In order to solve the technical problem, the utility model relates to a LF stove refining dust removal ash cyclic utilization system is including the refining ladle, the dust removal ash feed bin, dust remover and scraper blade ash conveyor, be connected with dusty flue gas pipeline on the refining ladle top surface, the one end that the refining ladle was kept away from to dusty flue gas pipeline is connected on the dust remover, the dust remover exit end is connected with the ash discharging device, be connected with the ash discharging pipeline on the ash discharging device, the one end that the ash discharging device was kept away from to the ash discharging pipeline is connected at the ash conveyor feed end of scraper blade, the ash conveyor discharge end of scraper blade is connected on the dust removal ash feed bin, dust removal ash feed bin exit linkage is on the refining ladle.

Further, including the bucket carry the machine, the bucket is carried the machine and is connected between scraper blade ash conveyor and dust removal ash feed bin, and the scraper blade ash conveyor discharge end is connected at the bucket and is carried the machine feed end, and the bucket is carried the machine discharge end and is connected on the dust removal ash feed bin.

Further, the dust remover is a pulse bag dust remover.

Furthermore, the dust remover is an electrostatic dust remover.

Furthermore, an emergency ash discharging pipeline is connected to the ash discharging device and is connected with the ash discharging pipeline in parallel.

The utility model has the advantages that: the refined fly ash collected by the dust remover is recycled in the LF refining furnace through a scraper ash conveyer and a bucket elevator; the system has simple structure; the method avoids the pollution of the environment caused by the separation of toxic and harmful gases after the chemical substances in the fly ash and water are subjected to chemical reaction in the fly ash discharging and humidifying process; but also can save the transportation cost of the fly ash, reduce the refining cost and realize the high added value recycling of secondary resources in the true sense.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: 1. refining the steel ladle; 2. a dedusting ash bin; 3. a bucket elevator; 4. a scraper ash conveyer; 5. a dust remover; 6. an ash discharge device; 7. a dusty flue gas duct; 8. an ash discharge pipe; 9. an emergency ash discharge pipeline.

Detailed Description

As shown in fig. 1, the utility model relates to a LF stove refining dust removal ash cyclic utilization system is including refining ladle 1, dust removal ash feed bin 2, dust remover 5 and scraper blade ash conveyor 4, be connected with dusty flue gas pipeline 7 on the 1 top surface of refining ladle, the one end that refined ladle 1 was kept away from to dusty flue gas pipeline 7 is connected on dust remover 5, the 5 exit end of dust remover is connected with dust discharging device 6, be connected with dust discharging pipeline 8 on the dust discharging device 6, dust discharging pipeline 8 keeps away from the one end of dust discharging device 6 and connects at scraper blade ash conveyor 4 feed end, 4 discharge ends of scraper blade ash conveyor are connected on dust removal

ash feed bin

2, 2 exit linkage in dust removal ash feed bin are on refining ladle 1.

Further, including the bucket carry machine 3, the bucket is carried machine 3 and is connected between scraper blade ash conveyor 4 and dust removal ash feed bin 2, and the 3 feed ends of bucket carry machine are connected at the bucket and are carried 3 feed ends to the scraper blade ash conveyor, and the 3 discharge ends of bucket carry machine are connected on dust removal ash feed bin 2.

Further, the dust remover 5 is a pulse bag dust remover.

Further, the dust remover 5 is an electrostatic dust remover.

Furthermore, an emergency ash discharging pipeline 9 is connected to the ash discharging device 6, and the emergency ash discharging pipeline 9 is connected in parallel with the ash discharging pipeline 8.

When the ladle 1 is refined to molten steel, dust-containing flue gas enters the dust remover 5 through the dust-containing flue gas pipeline 7, refined dust removal ash generated after the flue gas is purified by the dust remover 5 is unloaded into the scraper ash conveyer 4 through the ash unloading device 6 and the ash unloading pipeline 8, the scraper ash conveyer 4 conveys the refined dust removal ash back to the dust removal ash bin 2 in the LF furnace area, and the LF refining furnace is added quantitatively to participate in molten steel refining.

Because there may be the difference in height in dust removal ash feed bin 2 and scraper blade ash conveyor 4, so adopt bucket elevator 3 to accomplish the pay-off on the difference in height, 3 entrances are carried to bucket elevator 3 with concise dust removal ash to scraper blade ash conveyor 4, and rethread bucket elevator 3 will refine the dust removal ash and carry to dust removal ash feed bin 2.

When the LF is used for refining molten steel, if the usage amount of the fly ash is small or some special furnaces are used, the refined fly ash is not added, and the fly ash bin is full, the emergency ash discharge pipeline 9 is started to convey the refined fly ash to a sintering process for use by using a suction and discharge vehicle, so that the normal operation of the LF is not influenced.

The first embodiment is as follows:

use 60 tons LF refining furnace of a certain factory as an example the utility model discloses, when the molten steel got into the concise operation of LF stove, the dusty flue gas got into dust remover 5 through dusty flue gas pipeline 7, and the concise dust removal ash that produces behind the gas cleaning unloads scraper blade ash conveyor 4 through unloading grey device 6 and unloading grey pipeline 8, is carried back to the LF stove region by scraper blade ash conveyor 4, and after 3 entering dust removal feed bin 2 of rethread bucket elevator, concise ladle 1 is added to the ration.

The system structure is simpler, and the resource recycling of the refining fly ash in the refining furnace can be realized.

In the first embodiment, the dust collector 5 adopts a pulse bag dust collector, and the generated dust has extremely small particle size and low melting point. After the refined molten steel in the LF furnace is qualified, the refined fly ash is quantitatively added to the surface of the molten steel in the ladle through the refined fly ash recycling system of the LF furnace and is used as a molten steel covering agent, and the CaO content of the refined fly ash reaches 20-35 percent, so that the refined fly ash is an alkaline covering agent, molten steel impurities can be effectively adsorbed, a molten layer is formed quickly, the heat preservation effect is good, and the refined fly ash is waste generated in the process of refining the molten steel, so that the refining cost is greatly reduced.

Example two:

use 120 tons LF refining furnace of a certain factory as an example the utility model discloses, dust remover 5 adopts electrostatic precipitator in the example 2, and the dusty flue gas that the LF stove produced in refining process gets into dust pelletizing system earlier, then gets into electrostatic precipitator and carries out coarse dust removal, collects the dry ash that gets off and falls into scraper blade ash conveyor through unloading the ash device and fail to carry back to the refining region, and after rethread bucket elevator got into the dust removal feed bin, join as refining slag ration refining ladle and participate in slagging when refining molten steel.

Because the little advantage of concise dust removal ash granule can improve reaction efficiency, promotes the melting of lime, adds the concise dust removal ash after, compares with original technology, and the lime volume of adding reduces nearly one third, no longer uses fluorite slagging scorification, also need not to add other foamers such as carbide, has greatly practiced thrift the concise cost, and with the heat contrast that does not add the concise dust removal ash, the LF stove desulfurization rate is equivalent.

In the first embodiment and the second embodiment, the ash discharging device is further provided with the emergency ash discharging pipeline 9 in an accident state, when the LF is used for refining molten steel, if the usage amount of the fly ash is small or some special furnaces are not added with refined fly ash, the emergency ash discharging port is started to discharge ash under the condition that the fly ash bin is full, the refined fly ash is conveyed to the sintering process by using the suction and discharge vehicle, and the normal operation of the LF is not influenced.

Claims

1. The utility model provides a refined dust removal cyclic utilization system of LF stove which characterized in that: including refining ladle (1), dust removal ash feed bin (2), dust remover (5) and scraper blade ash conveyor (4), be connected with dusty flue gas pipeline (7) on refining ladle (1) top surface, the one end that refined ladle (1) was kept away from in dusty flue gas pipeline (7) is connected on dust remover (5), dust remover (5) exit end is connected with dust discharging device (6), be connected with dust discharging pipeline (8) on dust discharging device (6), the one end of dust discharging device (6) is kept away from in dust discharging pipeline (8) is connected at scraper blade ash conveyor (4) feed end, scraper blade ash conveyor (4) discharge end is connected on dust removal ash feed bin (2), dust removal ash feed bin (2) exit linkage is on refining ladle (1).

2. The LF furnace refining dedusting recycling system according to claim 1, characterized in that: the device comprises a bucket elevator (3), wherein the bucket elevator (3) is connected between a scraper ash conveyor (4) and a dedusting ash bin (2), the discharge end of the scraper ash conveyor (4) is connected to the feed end of the bucket elevator (3), and the discharge end of the bucket elevator (3) is connected to the dedusting ash bin (2).

3. The LF furnace refining dedusting recycling system according to claim 2, characterized in that: the dust remover (5) is a pulse bag dust remover.

4. The LF furnace refining dedusting recycling system according to claim 2, characterized in that: the dust remover (5) is an electric dust remover.

5. The LF furnace refining dedusting recycling system according to the claim 3 or 4, characterized in that: the ash discharging device (6) is connected with an emergency ash discharging pipeline (9), and the emergency ash discharging pipeline (9) is connected with the ash discharging pipeline (8) in parallel.