Coke dust separation system at ironmaking feeding position of metallurgical industry

Abstract

The utility model relates to metallurgical technique field, and specifically is a coke dust separation system at ironmaking feeding place of metallurgical industry. Including separate coke dust collecting bin and non coke dust collecting bin are equipped in turbid gas chamber in the warehouse type dust collector, directional dust collecting pipe network contains main pipe and branch pipe connected with coke dust point special line. Special storage ash component contains the storage ash bin that communicates with coke dust collecting bin through pneumatic conveying mechanism. Nitrogen protection unit, the outlet pipeline of nitrogen gas storage tank is connected to the dust cleaning mechanism and the power gas source interface of pneumatic conveying mechanism of dust remover respectively. The physical isolation collection of coke dust and non coke dust is realized through the warehouse type dust collector, and the fuel heat value dilution problem caused by traditional mixed collection is solved, and the directional dust collecting pipe network establishes coke dust point special capture channel, avoids the cross contamination of different raw material dust in the collection link.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical technology, specifically a coke dust separation system for ironmaking feeding in the metallurgical industry. Background Technology

[0002] Against the backdrop of sustainable development in the iron and steel metallurgical industry, energy efficiency optimization and resource recycling in the ironmaking process have become important directions for technological upgrading. As the core link in blast furnace ironmaking, the charging system is responsible for conveying and screening raw materials such as iron ore and coke. The total dust generated during its operation accounts for about 35%-40% of the total dust emissions from the entire process. Among them, coke dust has special resource value due to its high calorific value.

[0003] Traditional centralized dust collection systems mix and collect dust from various raw materials before uniformly distributing it to the sintering process. This approach presents significant process compatibility issues. Sintering production requires solid fuels to maintain a particle size range of 0-3 mm for centralized combustion. However, coke dust, due to its excessively fine particle size (typically less than 0.5 mm), causes an abnormal widening of the sintering combustion zone, thus affecting the strength and metallurgical properties of the sintered ore. In contrast, blast furnace injection systems have even finer requirements for pulverized coal particle size (below 200 mesh). The physical properties of existing coke dust better meet the needs of the injection process. However, the lack of effective separation and recovery methods prevents the cascade utilization of this high-calorific-value fuel.

[0004] Current dust removal systems generally suffer from a lack of functional diversity, failing to consider the differences in physical properties of dust from different raw materials or to establish energy matching mechanisms with subsequent processes. Particularly concerning are the characteristic dusts generated at coke transfer and screening points, which mix with non-coke dust during collection, reducing fuel calorific value utilization and increasing the difficulty of energy consumption control in subsequent processes. Therefore, achieving targeted collection and precise reuse of coke dust while maintaining existing dust removal efficiency and with low investment has become a key technological bottleneck in optimizing energy allocation in ironmaking systems. Utility Model Content

[0005] The present invention aims to solve the above problems and thus provide a coke dust separation system for the ironmaking charging station in the metallurgical industry for the directional collection of coke dust.

[0006] The technical solution adopted by this utility model to solve the aforementioned problem is:

[0007] A coke dust separation system for ironmaking charging in the metallurgical industry, comprising:

[0008] The compartmentalized dust collector includes a dust collector body with pulse jet cleaning. The dust collector body is equipped with a turbid air chamber and a clean air chamber. The turbid air chamber has an independent coke dust collection chamber and a non-coke dust collection chamber. Filter components for filtering dust are installed between the coke dust collection chamber and the clean air chamber, and between the non-coke dust collection chamber and the clean air chamber.

[0009] The directional dust collection network includes main pipelines and branch pipelines connected to dedicated coke dust emission points. The main pipelines form a closed air path connection with the coke dust collection bins.

[0010] The dedicated ash storage assembly includes an ash storage silo connected to a coke dust collection silo via a pneumatic conveying mechanism. The top of the ash storage silo is equipped with a silo top dust collector, and the bottom of the ash storage silo is equipped with a material output interface with a discharge valve.

[0011] The nitrogen protection unit includes at least one nitrogen storage tank, and the outlet pipeline of the nitrogen storage tank is connected to the dust removal mechanism and the power air source interface of the pneumatic conveying mechanism of the dust collector, respectively.

[0012] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0013] The system employs a compartmentalized dust collection device to physically separate coke dust from non-coke dust, solving the fuel calorific value dilution problem caused by traditional mixed collection. A directional dust collection network establishes dedicated collection channels for coke dust emission points, preventing cross-contamination of dust from different raw materials during collection. A dedicated ash storage silo, combined with nitrogen protection, forms a closed-loop conveying and storage system, ensuring the explosion-proof safety of high-calorific-value coke dust while maintaining its particle size characteristics to meet the requirements of blast furnace injection processes. While retaining the original dust collection function, the system achieves directional enrichment of coke dust through process reengineering, providing alternative fuel that meets injection standards for the ironmaking process. This effectively alleviates the combustion zone control problem caused by the incorporation of ultrafine coke powder in the sintering process, forming a new paradigm for process matching in dust resource utilization. Furthermore, the system modification cost is reduced by 60% compared to completely new construction.

[0014] As a preferred embodiment, a further technical solution of this utility model is:

[0015] Furthermore, a partition plate is installed between the coke dust collection chamber and the non-coke dust collection chamber. The partition plate separates the ash hopper of the turbid gas chamber into an independent containment space, and the partition plate forms a physical isolation barrier.

[0016] Furthermore, the partition plate is made of Q235 steel plate with a thickness of ≥5mm. The partition plate is fixed to the dust collector box by continuous welding. Using Q235 steel plate with a thickness of ≥5mm as the partition plate and fixing it to the dust collector box by continuous welding can effectively prevent the cross-mixing of coke dust and non-coke dust, maintain the purity and calorific value stability of coke dust, and at the same time, the selection of steel plate material takes into account both structural strength and welding process compatibility.

[0017] Furthermore, the pneumatic conveying mechanism includes a silo pump installed between the inlet of the ash storage silo and the outlet of the coke dust collection silo. As the core conveying equipment connecting the ash storage silo and the coke dust collection silo, the silo pump's closed-loop conveying characteristics prevent dust escape and ensure the integrity of the high-calorific-value coke dust during transfer. This design meets explosion-proof requirements while maintaining the particle size distribution characteristics of the coke dust, providing raw materials with particle size requirements for subsequent blast furnace injection processes.

[0018] Furthermore, the top of the silo top dust collector is equipped with an explosion relief valve, which provides dual safety protection by promptly releasing internal pressure when the system pressure is abnormal. This device works in conjunction with the nitrogen protection unit to form a safety system that combines active protection and passive pressure relief, significantly improving the reliability of system operation. It is particularly suitable for handling ultrafine coke dust with explosion risks. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0020] The diagram is labeled as follows: 1. Dust collector body; 2. Coke dust collection bin; 3. Non-coke dust collection bin; 4. Ash storage bin; 5. Bin top dust collector; 6. Material output interface; 7. Directional dust collection pipeline. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0022] A coke dust separation system for ironmaking feeding in the metallurgical industry includes: a compartmentalized dust removal device, comprising a dust collector body 1 with pulse jet cleaning, wherein the dust collector body 1 is a conventional device in the art, and the pulse jet cleaning includes a pulse valve, a jet pipe, an air storage tank, and a controller. The dust collector body 1 has a turbid gas chamber and a clean gas chamber inside. The turbid gas chamber is a hopper structure used to collect coarse dust particles. The clean gas chamber collects the purified gas and discharges it through the outlet. After the dust-laden gas enters the hopper, large particles settle directly, while fine dust rises with the airflow to the outer surface of the filter bag and is intercepted. The purified gas passes through the filter bag and enters the clean gas chamber for discharge. The turbid gas chamber has an independent coke dust collection chamber 2 and a non-coke dust collection chamber 3. The non-coke dust collection chamber 3 collects dust from return ore, miscellaneous material dust collection points, sintered ore dust collection points, mixed ore dust collection points, and truck unloading dust collection points. Filter components for filtering dust are installed between the coke dust collection chamber 2 and the clean gas chamber, and between the non-coke dust collection chamber 3 and the clean gas chamber. The filter components include a tube sheet fixed between the turbid gas chamber and the clean gas chamber, with filter bags installed on the tube sheet. The total air volume of each coke dust emission point is calculated, and the turbid gas chamber of the dust collector is divided into compartments according to the proportion of the coke dust collection points in the entire dust collection system.

[0023] The directional dust collection network 7 includes a main pipeline and branch pipelines connected to the dedicated coke dust emission point. The main pipeline forms a closed air circuit connection with the coke dust collection bin 2.

[0024] The dedicated ash storage assembly includes an ash storage silo 4 connected to a coke dust collection silo 2 via a pneumatic conveying mechanism. The top of the ash storage silo 4 is equipped with a silo top dust collector 5, and the bottom of the ash storage silo 4 is equipped with a material output interface 6. The material output interface 6 is equipped with a discharge valve and is connected to a suction and discharge tanker.

[0025] The nitrogen protection unit includes at least one nitrogen storage tank. The outlet pipeline of the nitrogen storage tank is connected to the power air source interface of the dust collector's cleaning mechanism and the pneumatic conveying mechanism, respectively. A pressure transmitter is installed on the outlet pipeline of the nitrogen storage tank.

[0026] Furthermore, a partition plate is provided between the coke dust collection chamber 2 and the non-coke dust collection chamber 3. The partition plate separates the ash hopper of the turbid gas chamber into an independent containment space, and the partition plate forms a physical isolation barrier.

[0027] Furthermore, the partition plate is made of Q235 steel plate with a thickness of ≥5mm. The partition plate is fixed to the dust collector box by continuous welding. Using Q235 steel plate with a thickness of ≥5mm as the partition plate and fixing it to the dust collector box by continuous welding can effectively prevent the cross-mixing of coke dust and non-coke dust, maintain the purity and calorific value stability of coke dust, and at the same time, the selection of steel plate material takes into account both structural strength and welding process compatibility.

[0028] Furthermore, the pneumatic conveying mechanism includes a silo pump installed between the inlet of the ash storage silo 4 and the outlet of the coke dust collection silo 2. As the core conveying equipment connecting the ash storage silo 4 and the coke dust collection silo 2, the silo pump's closed-loop conveying characteristics prevent dust escape and ensure the integrity of the high-calorific-value coke dust during transfer. This design meets explosion-proof requirements while maintaining the particle size distribution characteristics of the coke dust, providing raw materials with particle size requirements for subsequent blast furnace injection processes.

[0029] Furthermore, the top of the silo top dust collector 5 is equipped with an explosion relief valve, which provides dual safety protection, allowing for timely release of internal pressure when the system pressure is abnormal. This device works in conjunction with the nitrogen protection unit to form a safety system that combines active protection with passive pressure relief, significantly improving the reliability of system operation. It is particularly suitable for handling ultrafine coke dust with explosion risks.

[0030] The system employs a compartmentalized dust collection device to physically separate and collect coke dust from non-coke dust, solving the problem of fuel calorific value dilution caused by traditional mixed collection. A directional dust collection network 7 establishes a dedicated collection channel for coke dust emission points, avoiding cross-contamination of dust from different raw materials during collection. A dedicated ash storage silo 4, combined with nitrogen protection, forms a closed-loop conveying and storage system, ensuring the explosion-proof safety of high-calorific-value coke dust while maintaining its particle size characteristics to meet the requirements of blast furnace injection processes. While retaining the original dust collection function, the system achieves directional enrichment of coke dust through process reengineering, providing alternative fuel that meets injection standards for the ironmaking process. This effectively alleviates the combustion zone control problem caused by the addition of ultrafine coke powder in the sintering process, forming a new paradigm for process matching in dust resource utilization. Furthermore, the system modification cost is 60% lower than that of completely new construction, and the heat utilization rate of coke dust used for injection fuel in the ironmaking process is 60% higher than that used in the sintering process.

[0031] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A coke dust separation system at the ironmaking charging point in the metallurgical industry, characterized in that, include: The compartmentalized dust collector includes a dust collector body with pulse jet cleaning. The dust collector body is equipped with a turbid air chamber and a clean air chamber. The turbid air chamber is equipped with an independent coke dust collection chamber and a non-coke dust collection chamber. Filter components for filtering dust are installed between the coke dust collection chamber and the clean air chamber, and between the non-coke dust collection chamber and the clean air chamber. The directional dust collection network includes a main pipeline and branch pipelines that are connected to the coke dust emission point by a dedicated line. The main pipeline forms a closed air circuit connection with the coke dust collection bin. A dedicated ash storage assembly includes an ash storage silo connected to a coke dust collection silo via a pneumatic conveying mechanism. The top of the ash storage silo is equipped with a silo top dust collector, and the bottom of the ash storage silo is equipped with a material output interface, which is equipped with a discharge valve. The nitrogen protection unit includes at least one nitrogen storage tank, and the outlet pipeline of the nitrogen storage tank is connected to the dust removal mechanism and the power air source interface of the pneumatic conveying mechanism of the dust collector, respectively.

2. The coke dust separation system at the ironmaking charging station in the metallurgical industry according to claim 1, characterized in that: A partition is installed between the coke dust collection chamber and the non-coke dust collection chamber, which separates the ash hopper of the turbid gas chamber into an independent containment space.

3. The coke dust separation system at the ironmaking charging station in the metallurgical industry according to claim 2, characterized in that: The partition plate is made of Q235 steel plate with a thickness of 5mm or more, and is fixed to the dust collector box by continuous welding.

4. The coke dust separation system at the ironmaking charging station in the metallurgical industry according to claim 1, characterized in that: The pneumatic conveying mechanism includes a silo pump installed between the inlet of the ash storage silo and the outlet of the coke dust collection silo.

5. The coke dust separation system at the ironmaking charging point in the metallurgical industry according to claim 1, characterized in that: The dust collector on the top of the silo is equipped with an explosion relief valve.

Images