A fluidization device for conveying pipeline of flue gas desulfurization silo in a hot blast stove

Abstract

This utility model relates to the field of ironmaking technology, specifically to a fluidization device for the conveying pipeline of a flue gas desulfurization silo in a hot blast stove. This device addresses the problem of poor fluidity and easy adhesion of the desulfurizing agent, preventing it from fully reacting with the waste gas and resulting in inadequate waste gas treatment. The device includes a first and second ball valve on both sides of the silo bottom, a first and second fluidizing pipe running inside the branch pipes, and a fifth and sixth ball valve outside the two branch pipes. When blockage occurs, the first and second ball valves are opened to introduce nitrogen into the bottom of the silo for the first fluidization. Then, the first and second fluidizing pipes are opened, and nitrogen is introduced for the second fluidization. The fifth and sixth ball valves are further opened to introduce nitrogen for the third fluidization. Finally, the loss-in-weight feeder is activated to feed material into the flue gas desulfurization silo through mechanical stirring, reducing material accumulation, lowering the probability of blockage, and effectively solving the problems of material buildup, blockage, and poor material flow at the silo bottom.

Description

Technical Field

[0001] This utility model relates to the field of ironmaking technology, specifically to a fluidization device for a conveying pipeline of a hot blast stove flue gas desulfurization silo. Background Technology

[0002] Ultra-low emissions are a crucial aspect of steel production, directly impacting the normal operation and production efficiency of blast furnaces. By adopting advanced technologies, intelligent systems, green practices, and industry-leading standards, we can achieve clean production, circular development, low-carbon development, and sustainable development, meeting ultra-low emission requirements and realizing the reduction, harmlessness, and resource utilization of emissions, thus ensuring the green development of enterprises and the construction of ecological civilization.

[0003] The smooth flow of desulfurizing agent from the raw material silo is crucial for the normal operation of the hot blast stove flue gas desulfurization system. Problems with the flow can lead to poor injection, failure to meet ultra-low emission standards, or even production shutdowns, severely impacting the entire steel production line. Therefore, timely detection and resolution of flow problems are essential for ensuring ultra-low emission production in ironmaking. The desulfurizing agent used in the hot blast stove flue gas desulfurization system is calcium hydroxide, with a storage capacity of 30 tons. The raw material injection rate is adjusted based on the actual SO2 levels in the flue gas. Currently, the silo can be used for about one month at full capacity. However, because calcium hydroxide reacts with moisture in the air, increasing the viscosity of the desulfurizing agent, air cannons are used to ensure normal flow. In actual operation, this cannot be guaranteed, resulting in excessive SO2 levels in the flue gas, failing to meet ultra-low emission requirements. Utility Model Content

[0004] This utility model provides a fluidization device for the conveying pipeline of the flue gas desulfurization silo in a hot blast stove, in order to solve the problem that the desulfurizing agent has poor fluidity and is prone to sticking, and cannot fully react with the waste gas, resulting in insufficient waste gas treatment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A fluidization device for a conveying pipeline of a hot blast stove flue gas desulfurization silo includes a silo bottom, a main pipeline connected to a three-way pipe at the bottom of the silo bottom, a first branch pipe and a second branch pipe symmetrically connected at the bottom of the main pipeline, a first ball valve and a second ball valve respectively provided on both sides of the silo bottom, a first fluidizing pipe passing through the inside of the first branch pipe, a third ball valve provided at the end of the first fluidizing pipe extending out of the first branch pipe, an air hole opened on the outer wall of the first fluidizing pipe passing through the inside of the first branch pipe, a fifth ball valve provided on the outer wall of the first branch pipe, a second fluidizing pipe passing through the inside of the second branch pipe, a fourth ball valve provided at the end of the second fluidizing pipe extending out of the second branch pipe, an air hole opened on the outer wall of the second fluidizing pipe passing through the inside of the second branch pipe, and a sixth ball valve provided on the outer wall of the second branch pipe.

[0007] Furthermore, holes are pre-drilled below the first ball valve, the second ball valve, the fifth ball valve, and the sixth ball valve. The holes of the first ball valve and the second ball valve are connected to the bottom of the silo, the fifth ball valve is connected to the first branch pipe, and the sixth ball valve is connected to the second branch pipe.

[0008] Furthermore, the first and second fluidizing pipes are made of DN25 pipes, with a working pressure of 0.5MPa and a length of 500mm. φ10 through holes are drilled at 50mm intervals, and the connection between them and the bottom of the silo is welded.

[0009] Furthermore, the first ball valve, the second ball valve, the third ball valve, and the fourth ball valve are all DN25 manual ball valves, while the fifth ball valve and the sixth ball valve are DN20 manual ball valves.

[0010] Furthermore, the overall volume of the silo is 80m³.

[0011] This utility model has the following beneficial effects:

[0012] This utility model includes a first ball valve and a second ball valve on both sides of the bottom of the silo. A first fluidizing pipe is installed inside the first branch pipe, and a fifth ball valve is installed outside the first branch pipe. A second fluidizing pipe is installed inside the second branch pipe, and a sixth ball valve is installed outside the second branch pipe. When material blockage occurs, the first and second ball valves are opened to introduce nitrogen into the bottom of the silo for the first fluidization. Then, the first and second fluidizing pipes are opened and nitrogen is introduced for the second fluidization. The fifth and sixth ball valves are then opened to introduce nitrogen for the third fluidization. Finally, the loss-in-weight feeder is turned on to feed material into the flue gas desulfurization silo through mechanical stirring, reducing material accumulation, lowering the probability of blockage, and effectively solving the problems of material accumulation, blockage, and poor material discharge at the bottom of the silo. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] The meanings of the reference numerals in the attached figures are as follows:

[0015] 1. First ball valve; 2. Second ball valve; 3. T-junction pipe; 4. Third ball valve; 5. Fourth ball valve; 6. Fifth ball valve; 7. Sixth ball valve; 8. Bin bottom; 9. Main pipe; 10. First branch pipe; 11. Second branch pipe; 12. First fluidized bed pipe; 13. Second fluidized bed pipe; 14. Loss-in-weight feeder; 15. Valve; 16. Air vent. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] As shown in the figure, a fluidization device for a hot blast stove flue gas desulfurization silo conveying pipeline includes a silo bottom 8, a main pipeline 9 connected to a three-way pipeline 3 at the bottom of the silo bottom 8, a first branch pipe 10 and a second branch pipe 11 symmetrically connected at the bottom of the main pipeline 9, a first ball valve 1 and a second ball valve 2 respectively provided on both sides of the silo bottom 8, a first fluidizing pipe 12 passing through the inside of the first branch pipe 10, a third ball valve 4 provided at the end of the first fluidizing pipe 12 extending out of the first branch pipe 10, an air hole 16 opened on the outer wall of the first fluidizing pipe 12 inserted inside the first branch pipe 10, a fifth ball valve 6 provided on the outer wall of the first branch pipe 10, a second fluidizing pipe 13 passing through the inside of the second branch pipe 11, a fourth ball valve 5 provided at the end of the second fluidizing pipe 13 extending out of the second branch pipe 11, an air hole 16 opened on the outer wall of the second fluidizing pipe 13 inserted inside the second branch pipe 11, and a sixth ball valve 7 provided on the outer wall of the second branch pipe 11.

[0018] In practical use, the valve 15 in the middle of the main pipeline 9 is opened first. When the bottom of the silo 8 is blocked and the original fluidization device cannot effectively clear the blockage, the first ball valve 1 and the second ball valve 2 on the side wall of the bottom of the silo 8 are opened. Nitrogen gas is then supplied to the bottom of the silo through the pre-opened holes to fluidize the desulfurizing agent, which allows the desulfurizing agent to enter the three-way pipeline 3 more smoothly.

[0019] If a blockage is found in the three-way pipe 3 during inspection, based on the inspection findings, when the first branch pipe 10 is blocked, open the third ball valve 4 and the fifth ball valve 6 to allow nitrogen gas to be distributed in the first branch pipe 10 through the holes opened in the first fluidizing pipe 12 and the fifth ball valve 6, thereby achieving the effect of fluidizing and clearing the blockage in the first branch pipe 10. When the second branch pipe 11 is blocked, open the fourth ball valve 5 and the sixth ball valve 7 to allow nitrogen gas to be distributed in the second branch pipe 11 through the holes opened in the second fluidizing pipe 13 and the sixth ball valve 7, thereby achieving the effect of fluidizing and clearing the blockage in the second branch pipe 11, further resolving the blockage problem in the three-way pipe.

[0020] To accelerate the fluidization effect of the desulfurizing agent, the first ball valve 1 and the second ball valve 2 on the side wall of the bottom silo 8 can be opened simultaneously while the valve 15 in the middle of the main pipeline 9 is open. Nitrogen gas is then introduced through the holes in the first ball valve 1 and the second ball valve 2. The third ball valve 4 and the fourth ball valve 5 are then opened, and nitrogen gas is introduced into the first fluidizing pipe 12 and the second fluidizing pipe 13. The outer walls of the first fluidizing pipe 12 and the second fluidizing pipe 13 are provided with air holes 16, which allows the desulfurizing agent entering the first branch pipe 10 and the second branch pipe 11 to undergo secondary fluidization. Before the desulfurizing agent enters the loss-in-weight feeder 14, the fifth ball valve 6 and the sixth ball valve 7 are opened for tertiary fluidization. Finally, the desulfurizing agent is evenly distributed in the flue gas desulfurization silo by the mechanical agitation of the loss-in-weight feeder 14, effectively solving the problems of material sloshing, blockage, and poor material discharge at the bottom of the silo.

[0021] Furthermore, the desulfurizing agent used is calcium hydroxide powder, which is a white powder with a Ca(OH)2 content ≥90%, a moisture content ≤2% (wt), a particle size of ≥85% passing through a 325-mesh sieve, a bulk density of 0.4-0.65 g / cm³, and a BET specific surface area >40 m². 2 / g.

Claims

1. A fluidization device for a conveying pipeline of a hot blast stove flue gas desulfurization silo, comprising a silo bottom (8), a main pipeline (9) connected to a tee pipe (3) at the bottom of the silo bottom (8), and a first branch pipe (10) and a second branch pipe (11) symmetrically connected at the bottom of the main pipeline (9), characterized in that: The bottom of the silo (8) is provided with a first ball valve (1) and a second ball valve (2) on both sides. The first branch pipe (10) is provided with a first fluidizing pipe (12). The end of the first fluidizing pipe (12) extending out of the first branch pipe (10) is provided with a third ball valve (4). The outer wall of the first fluidizing pipe (12) inserted inside the first branch pipe (10) is provided with an air hole (16). The outer wall of the first branch pipe (10) is provided with a fifth ball valve (6). The second branch pipe (11) is provided with a second fluidizing pipe (13). The end of the second fluidizing pipe (13) extending out of the second branch pipe (11) is provided with a fourth ball valve (5). The outer wall of the second fluidizing pipe (13) inserted inside the second branch pipe (11) is provided with an air hole (16). The outer wall of the second branch pipe (11) is provided with a sixth ball valve (7).

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