Pressure relief device used when coal ash tank car is pumped into bin

Abstract

The utility model discloses a pressure relief device used when a coal ash tank car is pumped into a bin, and belongs to the technical field of mechanical pressure relief equipment. An upper opening of the expansion pipe is connected with a coal ash pumping pipeline of the bulk tank truck; the first end of the arc-shaped pipe is connected with the lower opening of the expansion pipe; the damping plate is of a net-shaped structure, and the damping plate is fixedly installed at the second end of the arc-shaped pipe; the impact blind plate and the damping plate are correspondingly arranged, and the impact blind plate is fixedly connected with the damping plate through a plurality of sets of supporting rods. The coal ash pumping device is used for weakening and eliminating the pressure generated when coal ash is pumped into the stock bin, the impact of newly-fed materials on a material layer in the stock bin is avoided, the stability of unloading at the bottom of the stock bin is greatly enhanced, and therefore the metering precision of the coal ash and the quality stability of downstream products are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical pressure relief equipment, in particular to a pressure relief device when a fly ash tank truck is pumped into a warehouse. Background Art

[0002] Fly ash, a solid waste from power plants, is widely used as a slurry ingredient in cement, concrete, and mine filling. As a dry powder, fly ash is typically stored in closed steel silos. It is pneumatically pumped into the silos from bulk tank trucks and discharged using metering scales before being used in downstream processes.

[0003] When pumping fly ash from bulk tankers, due to its light specific gravity, the pressurized material can impact the material layer within the silo, leading to unstable material discharge from the bottom of the silo and significant fluctuations in fly ash metering, seriously affecting batching accuracy and the quality stability of downstream products. To ensure downstream product quality, downstream production often needs to be halted while the fly ash is being pumped in, significantly impacting work efficiency. Utility Model Content

[0004] In order to solve the above problems, the technical solution adopted by the present utility model is:

[0005] A pressure relief device for a fly ash tank truck when pumping fly ash into a silo, comprising:

[0006] Bulk tanker fly ash pumping pipeline;

[0007] an expansion pipe, the upper end of which is connected to the fly ash pumping pipeline of the bulk tank truck, and the expansion pipe is used to change the cross-sectional area of ​​the pipeline to adjust the pressure and flow rate of the powder;

[0008] An arc-shaped pipe, wherein the first end of the arc-shaped pipe is connected to the lower end of the expansion pipe to increase the pipeline resistance to reduce the conveying pressure of the powder and change the discharge direction of the fly ash into the silo;

[0009] A damping plate, the damping plate being a mesh structure, and the damping plate being fixedly mounted on the second end of the arc tube;

[0010] An impact blind plate is provided corresponding to the damping plate and is fixedly connected to the damping plate via a plurality of support rods.

[0011] Furthermore, the expansion tube is a gradually expanding and contracting arc-shaped tube.

[0012] Furthermore, the upper end of the expansion pipe is fixedly connected to the fly ash pumping pipeline of the bulk tank truck through a reducer, the lower end of the expansion pipe is connected to the arc pipe, and the arc pipe is located in the bin.

[0013] Furthermore, the maximum diameter of the expansion tube is Φ600 mm.

[0014] Furthermore, the diameter of the fly ash pumping pipeline of the bulk tank truck is Φ150mm.

[0015] Furthermore, the arc tube is two butt-jointed 90° elbows to change vertical downward unloading to vertical upward unloading; wherein, the first ends of the two 90° elbows are fixedly connected, the second end of one of the 90° elbows is fixedly connected to the lower end of the expansion tube, and the second end of the other 90° elbow is fixedly connected to the damping plate through the expansion tube.

[0016] Furthermore, the 90° elbow is a 90° elbow of Φ250mm, and the turning radius is R500mm.

[0017] Furthermore, the diameter of the damping plate is Φ1500 mm, and a number of Φ30 mm sieve holes are evenly arranged on the damping plate.

[0018] Furthermore, the impact blind plate is an arc-shaped plate, the concave cavity of the arc-shaped plate is arranged opposite to the damping plate, and is fixedly connected to the damping plate through multiple groups of support rods.

[0019] Furthermore, the impact blind plate is an arc-shaped plate with a diameter of Φ1800 mm.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a pressure relief device for the fly ash tanker when pumping the fly ash into the silo, which is used to reduce and eliminate the pressure when the fly ash is pumped into the silo, avoiding the impact of the new material on the material layer in the silo, and greatly enhancing the stability of the unloading at the bottom of the silo, thereby ensuring the metering accuracy of the fly ash and the quality stability of the downstream products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a pressure relief device when a fly ash tank truck is pumping fly ash into a silo;

[0023] Among them, 1. Bulk tank truck fly ash pumping pipeline; 2. Expansion pipe; 3. 90° elbow; 4. Damping plate; 5. Impact blind plate. DETAILED DESCRIPTION

[0024] The utility model provides a pressure relief device for a fly ash tank truck when pumping fly ash into a silo. The technical solution of the utility model is described in detail below with reference to the accompanying drawings to make it easier to understand and grasp.

[0025] Example 1

[0026] refer to Figure 1, a pressure relief device for fly ash when being pumped into a silo by a fly ash tank truck, comprising:

[0027] Bulk tanker fly ash pumping pipeline 1;

[0028] An expansion pipe 2, the upper end of which is connected to the fly ash pumping pipe 1 of the bulk tank truck. The expansion pipe 2 is used to change the cross-sectional area of ​​the pipe so as to adjust the pressure and flow rate of the powder;

[0029] The first end of the arc tube is connected to the lower end of the expansion tube 2 to increase the pipeline resistance to reduce the conveying pressure of the powder and change the discharge direction of the fly ash into the silo;

[0030] The damping plate 4 is a mesh structure and is fixedly mounted on the second end of the arc tube;

[0031] The impact blind plate 5 is provided corresponding to the damping plate 4 and is fixedly connected to the damping plate 4 through multiple groups of support rods.

[0032] In this embodiment, the expansion tube 2 is a gradually expanding and contracting arc-shaped tube.

[0033] The upper end of the expansion pipe 2 is fixedly connected to the fly ash pumping pipeline 1 of the bulk tank truck through a reducer, and the lower end of the expansion pipe 2 is connected to the arc pipe, and the arc pipe is located in the warehouse.

[0034] Specifically, the expansion tube 2 is an arc-shaped structure, and the maximum diameter is Φ600 mm.

[0035] In this embodiment, the expansion pipe 2 adjusts the pressure and flow rate of the powder by changing the cross-sectional area of ​​the pipe. This part is a primary pressure relief device.

[0036] In this embodiment, the diameter of the fly ash pumping pipeline 1 of the bulk tank truck is Φ150 mm.

[0037] In this embodiment, the arc tube is two butt-jointed 90° elbows 3 to change the vertical downward unloading to vertical upward unloading; wherein, the first ends of the two 90° elbows 3 are fixedly connected, the second end of one 90° elbow 3 is fixedly connected to the lower end of the expansion tube 2, and the second end of the other 90° elbow 3 is fixedly connected to the damping plate 4 through the expansion tube.

[0038] The 90° elbow 3 is a 90° elbow 3 with a diameter of Φ250 mm and a turning radius of R500 mm.

[0039] In this embodiment, the expansion pipe 2 is connected to two 90° elbows 3 with a diameter of 250 mm and a turning radius of R500 mm. Its function is to reduce the conveying pressure of the powder by increasing the pipeline resistance. At the same time, it changes the discharge direction of the fly ash into the silo from the original vertical downward discharge to vertical upward discharge. This part is a secondary pressure relief device.

[0040] In this embodiment, the diameter of the damping plate 4 is Φ1500 mm, and a number of Φ30 mm sieve holes are evenly arranged on the damping plate 4 .

[0041] The impact blind plate 5 is an arc-shaped plate, the concave cavity of the arc-shaped plate is arranged opposite to the damping plate 4, and is fixedly connected to the damping plate 4 through multiple groups of support rods.

[0042] Specifically, the impact blind plate 5 is an arc-shaped plate with a diameter of Φ1800 mm.

[0043] In this embodiment, the third-stage pressure relief uses a damping plate 4 with a diameter of Φ1500mm. The damping plate 4 adopts a mesh structure with a number of Φ30mm sieve holes evenly arranged on it. The vertically upward pressurized fly ash impacts the damping plate 4. Part of the material hits the blind plate of the damping plate 4 and rebounds, moving upward together with the material passing through the damping plate 4. This further reduces the speed and pressure of the material moving upward.

[0044] The pressure and velocity of the material passing through damping plate 4 are greatly reduced. Finally, it impacts the impact blind plate 5 (diameter 1800mm). It then diffuses around the impact blind plate 5 and discharges into the fly ash storage silo. This section constitutes the fourth-stage pressure relief device. At this point, the discharge area is 10.67 times the original discharge area. The fourth-stage pressure relief device also significantly reduces the impact of the pumped fly ash on the existing material layer in the storage silo, ensuring stable discharge from the silo bottom.

[0045] According to the flow calculation formula of pneumatic conveying:

[0046] Q=π×D 2 / 4×ν×ρ

[0047] Where: D is the pipe diameter; ν is the flow rate of the powder in the pipe; and ρ is the specific gravity of fly ash in air. Inside the expansion pipe 2, the pipe diameter increases and the flow rate decreases.

[0048] The local resistance coefficient ζ of the 90° elbow 3 is 0.294, which is converted into pressure loss h = ζν 2 / (2g)=0.015ν 2 m;

[0049] Where ν is the flow rate of the powder in the pipeline, and g is the weight acceleration. After passing through two 90° elbows 3, its pressure is reduced by 0.03ν 2 m.

[0050] Before entering damping plate 4, the fly ash delivery pipe diameter increases from Φ250mm to Φ1500mm, further reducing the flow rate. At the same time, the aperture ratio of damping plate 4 is calculated as 60%, and 40% of the conveyed material impacts damping plate 4, reducing the flow rate to zero. It then flows out of the gap after mixing with other materials, significantly reducing the overall material velocity. Finally, it impacts the Φ1500mm impact blind plate 5, unloading from all sides of the impact blind plate 5 and evenly dispersing into the fly ash storage bin. The pumping pressure is essentially released, and the fly ash flow rate is greatly reduced, preventing impact on the original material in the bin. At the same time, the entire pressure relief device is fixed at the top of the fly ash bin, at a certain distance from the original material layer, further reducing disturbance to the original material layer and ensuring the stability of the bottom discharge.

[0051] The utility model adopts a four-stage pressure reducing device. The first stage adopts an expansion pipe 2 to adjust the pressure and flow rate of the powder by changing the cross-sectional area of ​​the pipeline; the second stage adopts two 90° elbows 3 of Φ250mm to increase the pipeline resistance and change the conveying direction of the fly ash; the third stage is designed with a Φ1500mm damping plate 4 to increase the resistance and reduce the flow rate; the fourth stage adopts a Φ1800mm impact blind plate to increase the resistance and expand the conveying area.

[0052] The combined design of a four-stage pressure reducing device significantly reduces the pressure in the original fly ash pumping pipeline, significantly mitigating the impact on the fly ash layer within the storage silo and ensuring stable bottom discharge. Actual performance has shown minimal fluctuations in the silo bottom weighing scale, thus ensuring the quality of downstream products. The results are highly significant.

[0053] The above fully describes the technical solution of the present invention. It should be noted that the specific implementation methods of the present invention are not limited to the above description. All technical solutions formed by ordinary technicians in this field using equivalent or equivalent transformations in structure, method or function based on the spirit of the present invention fall within the scope of protection of the present invention.

Claims

1. A pressure relief device for fly ash tanker trucks when pumping fly ash into a warehouse, characterized in that: include: Bulk tanker fly ash pumping pipeline; an expansion pipe, the upper end of which is connected to the fly ash pumping pipeline of the bulk tank truck, and the expansion pipe is used to change the cross-sectional area of ​​the pipeline to adjust the pressure and flow rate of the powder; An arc-shaped pipe, wherein the first end of the arc-shaped pipe is connected to the lower end of the expansion pipe to increase the pipeline resistance to reduce the conveying pressure of the powder and change the discharge direction of the fly ash into the silo; A damping plate, the damping plate being a mesh structure, and the damping plate being fixedly mounted on the second end of the arc tube; An impact blind plate is provided corresponding to the damping plate and is fixedly connected to the damping plate via a plurality of support rods.

2. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 1, characterized in that: The expansion tube is a gradually expanding and contracting arc-shaped tube.

3. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 2, characterized in that: The upper end of the expansion pipe is fixedly connected to the fly ash pumping pipeline of the bulk tank truck through a reducing pipe, the lower end of the expansion pipe is connected to the arc pipe, and the arc pipe is located in the warehouse.

4. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 2, characterized in that: The maximum diameter of the expansion tube is Φ600mm.

5. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 1, characterized in that: The diameter of the fly ash pumping pipeline of the bulk tank truck is Φ150mm.

6. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 1, characterized in that: The arc tube is composed of two butt-jointed 90° elbows, so as to change the vertical downward unloading to vertical upward unloading; wherein, the first ends of the two 90° elbows are fixedly connected, the second end of one of the 90° elbows is fixedly connected to the lower end of the expansion tube, and the second end of the other 90° elbow is fixedly connected to the damping plate through the expansion tube.

7. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 6, characterized in that: The 90° elbow is a 90° elbow of Φ250mm, and the turning radius is R500mm.

8. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 1, characterized in that: The diameter of the damping plate is Φ1500 mm, and a plurality of Φ30 mm sieve holes are evenly arranged on the damping plate.

9. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 1, characterized in that: The impact blind plate is an arc-shaped plate, the concave cavity of the arc-shaped plate is arranged opposite to the damping plate, and is fixedly connected to the damping plate through multiple groups of support rods.

10. The pressure relief device for fly ash pumped into a silo by a fly ash tanker according to claim 9, characterized in that: The impact blind plate is an arc-shaped plate with a diameter of Φ1800 mm.

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