Multi-powder-bunker pulverized coal production system for blast furnace coal injection

Abstract

The utility model discloses a multi-powder-bunker pulverized coal production system for blast furnace coal injection, belongs to the technical field of metallurgical production, and solves the problem that other blast furnaces cannot normally powder and inject coal due to no waste gas after part of existing blast furnaces exit in advance. The device comprises a plurality of pulverized coal bunkers, the pulverized coal bunkers are connected with a pulverizing station through pulverized coal conveying pipelines, the output ends of the pulverized coal conveying pipelines are connected with pulverized coal distributors, pulverized coal conveying control valves are arranged between the pulverized coal bunkers and the pulverized coal distributors, exhaust ports of the pulverized coal bunkers are connected with an exhaust pipeline, and a bag-type dust collector and an exhaust fan are sequentially arranged on the exhaust pipeline. The device is simple in structure, normal production of secondary coal injection is achieved, the processing cost of ton iron is reduced, and the device is integrally safe, stable and capable of operating efficiently and has extremely high generalization performance.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical production technology, specifically relating to a multi-powder pulverized coal production system for blast furnace pulverized coal injection. Background Technology

[0002] Modern blast furnace smelting requires coke, which serves to provide the heat needed for the smelting process, act as a reducing agent for reducing iron ore, and maintain the permeability of the blast furnace burden (especially the softening zone and below). Pulverized coal injection in blast furnaces involves directly injecting finely ground anthracite, bituminous coal, or a mixture of both into the furnace through the tuyeres to replace coke in providing heat and acting as a reducing agent, thereby reducing the coke ratio and lowering the cost of pig iron.

[0003] Currently, pulverization and pulverized coal injection facilities are separated in production. Pulverized coal is transported from the pulverization workshop to the injection station near the blast furnace via tanker trucks or pneumatic pipelines, and then injected into the blast furnace, either directly or indirectly, to complete production. After the blast furnace has been in operation for a long time, the reducing agent can affect the interior of the furnace, causing severe deterioration. During production, it may be necessary to shut down some blast furnaces in advance for maintenance. However, the absence of waste gas after shutdown prevents other blast furnaces from pulverizing and injecting coal normally, affecting the normal operation of the system. Utility Model Content

[0004] This invention provides a multi-compartment pulverized coal production system for blast furnace pulverization, which solves the problem that some existing blast furnaces cannot produce pulverized coal and inject coal normally after some blast furnaces are shut down and no waste gas is generated.

[0005] The technical solution of this utility model is: a multi-compartment pulverized coal production system for blast furnace pulverized coal injection, comprising multiple pulverized coal compartments, which are connected to the pulverizing station via pulverized coal conveying pipelines. The output end of the pulverized coal conveying pipelines is connected to each pulverized coal compartment via a pulverized coal distributor. Each pulverized coal compartment is equipped with a pulverized coal conveying control valve between itself and the pulverized coal distributor. The exhaust port of each pulverized coal compartment is connected to an exhaust pipe, and a bag filter and an exhaust fan are sequentially installed on the exhaust pipe.

[0006] As a further improvement of this utility model, the bag filter is equipped with a dust collection pipe at the bottom, which is connected to the coal powder silo, and the filtration area of ​​the bag filter reaches 400m². 2 .

[0007] The beneficial effects of this utility model are as follows: By installing pulverized coal control valves on the pulverized coal silos, the sequence of pulverized coal entering the silos is controlled according to the site conditions, and pulverized coal is precisely distributed to each silo. Simultaneously, an exhaust fan is used to ensure a negative pressure environment for the entire system, enabling continuous and stable operation and ensuring normal pulverized coal injection in the blast furnace. This solves the technological problem of other blast furnaces being unable to pulverize and inject pulverized coal normally due to the lack of exhaust gas after a single blast furnace shutdown. This utility model also connects a bag filter to the exhaust fan to discharge the filtered clean conveying gas, and returns the pulverized coal collected by the bag filter to the pulverized coal silos through an ash collection pipe, reducing processing costs. This utility model has a simple structure, realizes normal production of secondary pulverized coal injection, reduces the processing cost per ton of iron, and the overall device is safe, stable, and highly efficient, making it highly applicable and widely applicable. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] In the diagram: 1. Pulverized coal conveying pipeline; 2. Pulverized coal distributor; 3. Pulverized coal conveying switching valve; 4. Pulverized coal conveying control valve; 5. Exhaust pipeline; 6. Baghouse dust collector; 7. Exhaust fan; 8. Ash collection pipe; 9. Pulverized coal silo. Detailed Implementation

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0011] like Figure 1 As shown, a multi-compartment pulverized coal production system for blast furnace pulverized coal injection includes multiple pulverized coal compartments 9. The pulverized coal compartments 9 are connected to the pulverizing station through a pulverized coal conveying pipeline 1. The output end of the pulverized coal conveying pipeline 1 is connected to each pulverized coal compartment 9 through a pulverized coal distributor 2. Each pulverized coal compartment 9 is equipped with a pulverized coal conveying control valve 4 between itself and the pulverized coal distributor 2. The exhaust ports of the multiple pulverized coal compartments 9 are connected to an exhaust pipeline 5. A bag filter dust collector 6 and an exhaust fan 7 are sequentially installed on the exhaust pipeline 5.

[0012] The bag filter 6 has a dust collection pipe 8 at the bottom, which is connected to the coal powder silo 9. The filtration area of ​​the bag filter 6 is 400 m². 2 The air volume of exhaust fan 7 is 20000m³ / h.

[0013] In use, the pulverized coal produced by the pulverizing station is transported by the pulverizing pipeline 1. The pulverizing switching valve 3 on the pulverizing pipeline 1 controls the transport of each pulverizing branch pipe, realizing the switching of pulverized coal feeding into each pulverized coal bin 9. The pulverizing branch pipe is connected to the pulverized coal distributor 2. The pulverizing control valve 4 of the pulverized coal distributor 2 controls the pulverized coal feeding sequence into the bin. To prevent the airflow from impacting the pulverized coal bin 9, it can also ensure that at least two or more pulverized coal bins 9 are fed at the same time. The exhaust port at the top of each pulverized coal bin 9 is connected to the exhaust pipe 5. The transported gas is filtered by the bag filter dust collector 6. The bag filter dust collector 6 is connected to the ash collection pipe 8 below. The ash collection pipe 8 is connected to the pulverized coal bin 9 below. The ash collection pipe 8 is equipped with a rotary valve. The rotary valve can return the pulverized coal collected by the bag filter dust collector 6 to the pulverized coal bin along the ash collection pipe 8.

Claims

1. A multi-compartment pulverized coal production system for blast furnace pulverized coal injection, comprising multiple pulverized coal compartments (9), wherein the pulverized coal compartments (9) are connected to a pulverizing station via a pulverized coal conveying pipeline (1), characterized in that: The output end of the coal conveying pipeline (1) is connected to each coal powder bin (9) through the coal powder distributor (2). Each coal powder bin (9) is equipped with a coal conveying control valve (4) between it and the coal powder distributor (2). The exhaust port of the coal powder bin (9) is connected to an exhaust pipe (5). A bag filter (6) and an exhaust fan (7) are installed on the exhaust pipe (5) in sequence.

2. The multi-bucket pulverized coal production system for blast furnace pulverized coal injection according to claim 1, characterized in that: The bag filter (6) is equipped with a dust collection pipe (8) at the bottom, which is connected to the coal powder silo (9).

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