Pulverizing injection tank fluidized bed leak detection system and method

Abstract

The invention discloses a powder injection tank fluidized bed leak detection system and method, and the system comprises a first pipeline which is communicated with the bottom of an injection tank and is provided with a first valve; two ends of the second pipeline are respectively communicated with the bottom and the top of the injection tank, and a second valve, a dust content measuring element and a third valve are sequentially arranged on the second pipeline. Damage or leakage of the fluidized bed of the injection tank can be automatically detected, an alarm is given in time, and the influence on production is eliminated through treatment of the corresponding valve.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace pulverized coal injection technology, and particularly relates to a fluidized bed leak detection system and method for pulverized coal injection tanks. Background Technology

[0002] Pulverized coal injection (PCI) is a system used in iron and steel smelting for coal storage, preparation, conveying, and injection. It reduces production costs and optimizes furnace performance by injecting pulverized coal into the blast furnace to replace some of the coke. The system includes pulverized coal preparation, distribution, conveying, and injection. Key equipment includes a fluidized bed mixer, pulverized coal distributor, injection tank, and high-temperature resistant injection lance.

[0003] Currently, the blast furnace pulverized coal injection process is gradually transitioning to automatic control, reducing manual intervention. However, during automatic control, unstable pulverized coal injection can cause fluidized bed damage or leaks that cannot be detected immediately. This results in insufficient and uneven pulverized coal spraying at the bottom of the injection tank, and in severe cases, severe powder accumulation at the bottom of the fluidized bed can cause complete blockage, rendering the injection tank unusable. Inspecting for fluidized bed damage and leaks requires significant effort and time, impacting the stable operation of the pulverized coal injection system. Furthermore, incomplete pulverized coal spraying within the injection tank, coupled with the large amount of pulverized coal scattered on the ground during fluidized bed disassembly and the generation of significant dust during screen cleaning and ground dust removal, all contribute to environmental pollution. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fluidized bed leak detection system and method for pulverizing spray tanks, ensuring the normal use of the spray tanks and accurately determining whether the fluidized bed is damaged or leaking.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following solution: This invention provides a fluidized bed leak detection system for a pulverizing spray tank, comprising: The first pipeline connects to the bottom of the injection tank, and a first valve is installed on it; The second pipeline connects to the bottom and top of the blow tank at both ends, and a second valve, a dust measuring element, and a third valve are installed on it in sequence.

[0006] Furthermore, the first valve is a flanged pneumatic ball valve.

[0007] Furthermore, the second valve is a flanged pneumatic ball valve.

[0008] Furthermore, the third valve is a flanged pneumatic ball valve.

[0009] Furthermore, the dust-measuring element is electrically connected to the blowdown tank's electronic control operating system to send alarm signals to the blowdown tank's electronic control operating system for displaying the alarm.

[0010] Furthermore, the first pipeline and the second pipeline are connected outside the injection tank.

[0011] Furthermore, nitrogen gas was introduced into the first pipeline.

[0012] The present invention also provides a leak detection method for the aforementioned fluidized bed leak detection system for pulverizing spray tanks, comprising: Open the first valve and introduce nitrogen into the injection tank through the first pipeline, and open the second and third valves; If the fluidized bed in the injection tank is damaged or leaking, the coal powder accumulated under the fluidized plate will be blown into the second pipeline by nitrogen gas introduced into the injection tank. When the dust-containing element detects coal dust, it sends an alarm signal to the electrical control operating system of the injection tank, where the alarm is displayed. Powdered coal is transported along the second pipeline to the fluidization plate in the injection tank; When the alarm signal disappears, close the second and third valves; Nitrogen gas introduced into the injection tank blows the pulverized coal on the fluidized plate to transport the pulverized coal out of the injection tank. Beneficial effects

[0013] This invention automatically detects damage or leakage in the fluidized bed of the spray tank using a dust-measuring element, promptly triggering an alarm. Corresponding first, second, and third valves on the first and second pipelines are then opened and closed in a timely manner to eliminate any impact on production, ensuring the normal operation of the spray tank. This also avoids the increased frequency of disassembly and reassembly of the spray tank fluidized bed due to human error, which would otherwise lead to increased maintenance intensity, longer inspection times affecting the production process, and unavoidable dust pollution during maintenance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a fluidized bed leak detection system for a powder-making injection tank provided in an embodiment of the present invention; In the diagram: 1. First valve; 2. Second valve; 3. Third valve. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0016] like Figure 1 As shown, this embodiment provides a fluidized bed leak detection system for a pulverizing spray tank, which consists of a first pipeline and a second pipeline.

[0017] Specifically, the first pipeline connects to the bottom of the injection tank, and a first valve 1 is installed on it, through which nitrogen gas is introduced. The two ends of the second pipeline connect to the bottom and top of the injection tank, respectively, and a second valve 2, a dust-measuring element, and a third valve 3 are installed on it sequentially. The first valve 1, second valve 2, and third valve 3 are all flange-type pneumatic ball valves, adapted for gas pipeline operation. The dust-measuring element is electrically connected to the injection tank's electrical control system, used to send alarm signals to the system for display. The first and second pipelines are connected externally to the injection tank, accelerating the conveying speed of pulverized coal in the second pipeline.

[0018] This system automatically detects damage or leakage in the fluidized bed of the spray tank by measuring dust-laden elements, promptly alarms, and the corresponding first, second, and third valves on the first and second pipelines are opened and closed in a timely manner to eliminate the impact on production, ensure the normal use of the spray tank, and avoid the increased number of times the spray tank fluidized bed is disassembled and reassembled due to human error, which would lead to increased maintenance intensity, long inspection time affecting the production process, and unavoidable dust pollution during maintenance. Example 2

[0019] This embodiment provides a leak detection method for the fluidized bed leak detection system of the pulverizing spray tank described in Embodiment 1. The specific process is as follows: After the powder filling tank is completed, open the first valve 1 and introduce nitrogen into the powder filling tank through the first pipeline, and open the second valve 2 and the third valve 3. If the fluidized bed in the injection tank is damaged or leaking, there will be coal dust accumulation at the bottom of the fluidizing plate. In this case, the coal dust at the top of the fluidizing plate cannot be blown up, causing the injection tank to malfunction. At this time, the coal dust accumulated at the bottom of the fluidizing plate is blown into the second pipeline by the nitrogen gas introduced into the injection tank. After the dust-containing element on the second pipeline detects coal dust, it sends an alarm signal to the electrical control operating system of the injection tank, where the alarm is displayed. The pulverized coal is transported along the second pipeline to the fluidization plate in the injection tank for recycling and reuse, thus preventing the pulverized coal from falling out of the injection tank. When all the coal dust accumulated at the bottom of the fluidized bed is transported to the injection tank along the second pipeline and recycled on the fluidized bed, the dust-measuring element will not detect coal dust and will no longer send an alarm signal. The alarm on the injection tank's electrical control operating system interface will disappear. At this time, the second valve and the third valve will be closed to prevent the coal dust on the fluidized bed from returning to the second pipeline. Finally, nitrogen gas introduced into the injection tank blows the pulverized coal on the fluidized plate to transport the pulverized coal out of the injection tank, ensuring the normal use of the injection tank.

[0020] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A fluidized bed leak detection system for a pulverizing spray tank, characterized in that, include: The first pipeline connects to the bottom of the injection tank, and a first valve is installed on it; The second pipeline connects to the bottom and top of the blow tank at both ends, and a second valve, a dust measuring element, and a third valve are installed on it in sequence.

2. The fluidized bed leak detection system for pulverizing spray tanks according to claim 1, characterized in that, The first valve is a flanged pneumatic ball valve.

3. The fluidized bed leak detection system for pulverizing spray tanks according to claim 1, characterized in that, The second valve is a flanged pneumatic ball valve.

4. The fluidized bed leak detection system for pulverizing spray tanks according to claim 1, characterized in that, The third valve is a flanged pneumatic ball valve.

5. The fluidized bed leak detection system for pulverizing spray tanks according to claim 1, characterized in that, The dust-measuring element is electrically connected to the blowdown tank's electronic control system and is used to send alarm signals to the blowdown tank's electronic control system for displaying the alarm.

6. The fluidized bed leak detection system for pulverizing spray tanks according to claim 1, characterized in that, The first pipeline and the second pipeline are connected outside the injection tank.

7. The fluidized bed leak detection system for pulverizing spray tanks according to claim 1, characterized in that, Nitrogen gas was introduced into the first pipeline.

8. A leak detection method for a fluidized bed leak detection system for a pulverizing spray tank according to any one of claims 1 to 7, characterized in that, include: Open the first valve and introduce nitrogen into the injection tank through the first pipeline, and open the second and third valves; If the fluidized bed in the injection tank is damaged or leaking, the coal powder accumulated under the fluidized plate will be blown into the second pipeline by nitrogen gas introduced into the injection tank. When the dust-containing element detects coal dust, it sends an alarm signal to the electrical control operating system of the injection tank, where the alarm is displayed. Powdered coal is transported along the second pipeline to the fluidization plate in the injection tank; When the alarm signal disappears, close the second and third valves; Nitrogen gas introduced into the injection tank blows the pulverized coal on the fluidized plate to transport the pulverized coal out of the injection tank.

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