European silo coal drop pipe dust suppression device based on multi-stage collaborative dust suppression

Abstract

The invention relates to an European silo coal drop pipe dust suppression device based on multi-stage cooperative dust suppression, which comprises a spiral guide plate assembly and a flexible sealing curtain, the spiral guide plate assembly is mounted at the top of an European silo coal drop pipe to form a guide deceleration area so as to guide and decelerate coal entering the European silo coal drop pipe, and the flexible sealing curtain is mounted at the top of the European silo coal drop pipe. The flexible sealing curtain is annularly installed at the position away from an outlet in the bottom of the European bin coal falling pipe by a preset distance, a dynamic sealing area is formed, and dust dissipation is restrained by dynamically adjusting an opening and closing gap in a self-adaptive mode. Compared with the prior art, the invention has the advantages of effective dust dissipation inhibition effect and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of Euro silos, and in particular to a dust suppression device for the coal dropping pipe of a Euro silo based on multi-stage collaborative dust suppression. Background Art

[0002] In the field of coal storage and transportation, the coal dropping pipe of a Euro silo, as a key device, its design defects are becoming increasingly prominent, becoming a bottleneck restricting the green development of the industry. Currently, most of the coal dropping pipes of Euro silos are not designed to fully consider the complexity of dust control. As a result, in actual operation, the dust-containing gas often stays in the pipe due to poor discharge, which not only exacerbates the abnormal accumulation of pulverized coal in the pipe wall gap, but also forms a potential risk of coal blockage, threatening the safe and stable operation of the entire conveying system.

[0003] In addition, the widely used fixed-angle deflector design in the market is unable to cope when faced with the working conditions of frequent fluctuations in coal flow, and it is difficult to effectively suppress the dispersion of dust, resulting in a high dust concentration in the working environment. At the same time, the kinetic energy attenuation effect of a single-stage buffer step is limited and difficult to meet the requirements of efficient dust suppression. The opening and closing gap of the traditional rigid curtain is fixed and non-adjustable, and it is extremely easy to get stuck when the coal flow passes through, which not only reduces the sealing efficiency but also increases the equipment maintenance cost, and urgently needs to be solved through technological innovation. Summary of the Invention

[0004] The purpose of the present invention is to provide a dust suppression device for the coal dropping pipe of a Euro silo based on multi-stage collaborative dust suppression, which can improve the dust suppression effect.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A dust suppression device for the coal dropping pipe of a Euro silo based on multi-stage collaborative dust suppression includes a spiral deflector assembly and a flexible sealing curtain. The spiral deflector assembly is installed at the top of the coal dropping pipe of the Euro silo to form a diversion and deceleration area for guiding and decelerating the coal entering the coal dropping pipe of the Euro silo. The flexible sealing curtain is annularly installed at a preset distance from the bottom outlet of the coal dropping pipe of the Euro silo to form a dynamic sealing area for suppressing the dispersion of dust by adaptively dynamically adjusting the opening and closing gap.

[0007] Furthermore, the spiral deflector assembly is composed of a plurality of spiral deflectors combined into a spiral structure.

[0008] Furthermore, the spiral angle of the spiral deflector is 30° - 60°.

[0009] Furthermore, the spacing gradient of the spiral deflectors gradually increases in the axial direction, and the calculation expression for the spacing gradient of the spiral deflectors is:

[0010] d n = d0 + k·L

[0011] In the formula, d n is the spacing of the nth spiral deflector, d0 is the thickness of the spiral deflector, k is the gradient change rate, and L is the total length of the spiral deflector assembly, with the unit of mm.

[0012] Furthermore, the surface of the spiral deflector assembly is subjected to sandblasting treatment with a roughness Ra = 3.2μm ± 0.5 to enhance the effect of suppressing air flow disturbance in the flow guiding and decelerating area.

[0013] Furthermore, the flexible sealing curtain is a three-layer composite structure, where the outer layer is a wear-resistant layer, the middle layer is a reinforcing layer composed of a woven mesh, and the inner layer is a sealing layer made of rubber.

[0014] Furthermore, the stress balance calculation formula for the composite structure of the flexible sealing curtain is:

[0015]

[0016] In the formula, σ max is the maximum stress, E i is the elastic modulus of the ith layer, t i is the thickness of the ith layer, and ∈ is the strain.

[0017] Furthermore, the flexible sealing curtain is composed of multiple petal-shaped segments, and a counterweight is connected below each petal-shaped segment. The mass of the counterweight satisfies:

[0018] m = 0.2·L

[0019] In the formula, m is the mass of the counterweight, and L is the unilateral length of the flexible sealing curtain.

[0020] Furthermore, the adjustment expression for the opening and closing gap of the flexible sealing curtain is:

[0021] δ(t) = 40·(1 - e -0.015Q(t) ) + 10

[0022] In the formula, δ(t) is the opening and closing gap of the flexible sealing curtain at time t, and the adaptive adjustment range is 10mm to 50mm. Q(t) is the coal flow rate at time t.

[0023] Furthermore, it also includes a curtain frame. The curtain frame is welded into an annular support structure by square tubes, and the upper end of the flexible sealing curtain is connected to the curtain frame through a U-shaped clamp.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) In the present invention, from the coal entering to exiting the coal dropping pipe of the Euro silo, a spiral guide vane assembly and a flexible sealing curtain are respectively arranged at the top and bottom of the coal dropping pipe of the Euro silo to form a flow guide and deceleration zone and a dynamic sealing zone respectively, so that the coal flow is decelerated at the pipe inlet, and the opening and closing gap of the curtain is dynamically adjusted at the pipe outlet. The two work together to effectively improve the dust suppression effect.

[0026] (2) In the present invention, through the spiral lift angle of the spiral guide vane and the design of the gradient spacing of the spiral guide vane, the eddy current intensity is reduced, and the dust emission rate is further reduced.

[0027] (3) The flexible sealing curtain of the present invention adopts a three-layer composite material structure. Through the sealing effect, dust is effectively blocked outside, and the flexible sealing curtain can achieve stress balance and improve the service life.

[0028] (4) A counterweight is connected to the bottom of the flexible sealing curtain of the present invention to provide a downward force, and the opening and closing gap can be adaptively adjusted within the range of 0 to 50 mm to adapt to the change of the coal flow. Description of the Drawings

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is a three-dimensional structure diagram of the spiral guide vane assembly of the present invention;

[0031] Figure 3 is a schematic diagram of the layered point cloud model of the flexible sealing curtain of the present invention;

[0032] Figure 4 is a cross-sectional view of the three-layer composite structure of the flexible sealing curtain of the present invention;

[0033] In the figure: 1. Spiral guide vane assembly, 11: Spiral guide vane; 2. Flexible sealing curtain; 3. Coal dropping pipe of the Euro silo, 31. Pipe top, 32. Pipe bottom; 4: Counterweight, 5: Curtain frame. Detailed Embodiment

[0034] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manner and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are used to describe a common object, only indicating different instances referring to the same object, rather than implying that the objects so described must be in a given order, whether in terms of time, space, sorting, or any other way.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] This embodiment provides a dust suppression device for the coal dropping pipe of an Euro bin based on multi - level collaborative dust suppression. As Figure 1 shown, the device adopts a vertically stacked modular structure, which is convenient for quick disassembly, installation and maintenance. The device includes a spiral guide plate assembly 1, a flexible sealing curtain 2 and a curtain frame 5. The spiral guide plate assembly 1 is installed at the top 31 of the coal dropping pipe 3 of the Euro bin. The curtain frame 5 is welded into an annular support structure by square pipes, with a diameter adapted to the coal dropping pipe 3 of the Euro bin, and is installed at the outlet of the bottom 32 of the coal dropping pipe 3 of the Euro bin. The upper end of the flexible sealing curtain 2 is connected to the curtain frame 5 through a U - shaped clamp, and the drooping length is 1.2 meters.

[0038] The spiral guide plate assembly 1 is rigidly connected to the top 31 of the coal dropping pipe 3 of the Euro bin through a flange. In this embodiment, the spiral guide plate assembly 1 is installed at the top 31 of the coal dropping pipe 3 of the Euro bin to form a flow - guiding deceleration zone for guiding and decelerating the coal entering the coal dropping pipe 3 of the Euro bin.

[0039] The spiral guide plate assembly 1 is composed of a plurality of spiral guide plates 11 made of 304 stainless steel, and the surface of the spiral guide plates 11 is sand - blasted (roughness Ra = 3.2μm ± 0.5) to enhance the effect of suppressing air flow disturbance.

[0040] As Figure 2As shown, the spiral angle of the spiral deflector 11 is fixedly set, and the range of the spiral angle θ is 30° to 60°, preferably 45°. In order to further control the flow velocity of the coal flow, the present embodiment also designs a spacing gradient between the spiral deflectors 11, and the spacing gradient gradually increases in the axial direction. For example, the spacing gradient is set to 50 mm at the inlet section of the flow guiding and decelerating area, 100 mm at the middle section, and 150 mm at the outlet section (the gradient change rate is 2 mm / 100 mm). Specifically, in actual applications, the spacing gradient can be set according to the following formula:

[0041] d n = d0 + k·L

[0042] In the formula, d n is the spacing of the nth spiral deflector 11, d0 = 50 mm, representing the thickness of the spiral deflector, k is the gradient change rate, and L is the total length of the spiral deflector assembly 1, with the unit of mm.

[0043] By combining the spiral angle of the spiral deflector 11 with the design of the gradient spacing change of the spiral deflector 11, the eddy current intensity can be reduced and the dust emission rate can be decreased.

[0044] The flexible sealing curtain 2 consists of a dynamic sealing area composed of 6 petal-shaped segments (evenly distributed) to suppress dust emission by adaptively and dynamically adjusting the opening and closing gap. As Figure 3 shown, a lead counterweight 4 (200 g ± 5 g) is connected below each segment to provide a downward force for the bottom weight of the segment, so as to balance the weight of the counterweight and the flexible sealing curtain 2 and ensure the sensitivity and sealing performance of the gap opening and closing. The mass of the counterweight 4 satisfies:

[0045] m = 0.2·L

[0046] In the formula, m is the mass of the counterweight 4, and L is the single-side length of the flexible sealing curtain 2, with the unit of m.

[0047] As Figure 4 shown, the flexible sealing curtain 2 has a three-layer structure, specifically including:

[0048] Outer layer: UHMWPE wear-resistant layer (thickness 3 mm, tensile strength ≥ 50 MPa);

[0049] Middle layer: aramid fiber woven mesh (200D × 200D, areal density 500 g / m 2 );

[0050] Inner layer: nitrile rubber layer (thickness 2 mm, friction coefficient μ ≤ 0.3).

[0051] The flexible sealing curtain 2 has a closed state, a semi-open state, and a fully open state through adaptive dynamic opening and closing adjustment. The principle of adaptive dynamic opening and closing adjustment is as follows:

[0052] Gravity of the counterweight 4: The counterweight 4 at the bottom of the segment uses gravity to provide a downward force.

[0053] Impact force of the coal flow: The coal flow pushes open the segments, and the opening and closing gaps of the segments achieve adaptive dynamic opening and closing adjustment. The relationship between the opening and closing gap δ(t) of the segments and the flow rate Q(t) is:

[0054] δ(t) = 40·(1 - e -0.015Q(t) ) + 10

[0055] In the formula, δ(t) is the opening and closing gap of the flexible sealing curtain 2 at time t, and the adaptive adjustment range is 0 mm to 50 mm. Q(t) is the coal flow rate at time t, with the unit of t / h. The constant term 10 avoids jamming at low flow rates (Q < 100 t / h), and the measured gap error ≤ 5%.

[0056] In addition, the stress balance formula for the composite structure of the flexible sealing curtain (2) is:

[0057]

[0058] In the formula, E1 = 1.2 GPa: the elastic modulus of the outer UHMWPE layer, E2 = 70 GPa: the elastic modulus of the middle aramid fiber layer, E3 = 70 GPa: the elastic modulus of the inner nitrile rubber, t1 = 3 mm, t2 = 1 mm, t3 = 2 mm: the thicknesses of each layer, and ∈ is the strain.

[0059] Through actual measurement, it is obtained that the stress distribution uniformity of the flexible sealing curtain 2 is improved by 40%, and the fatigue life is extended to 500,000 times of opening and closing.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An dust suppression device for the coal dropping pipe of the Euro warehouse based on multi-level collaborative dust suppression, characterized in that, It includes a spiral deflector assembly (1) and a flexible sealing curtain (2). The spiral deflector assembly (1) is installed at the top (31) of the coal dropping pipe (3) of the Euro bin to form a deflector deceleration area for deflecting and decelerating the coal entering the coal dropping pipe (3) of the Euro bin. The flexible sealing curtain (2) is annularly installed at a preset distance from the outlet of the bottom (32) of the coal dropping pipe (3) of the Euro bin to form a dynamic sealing area for suppressing dust dispersion by adaptively and dynamically adjusting the opening and closing gap.

2. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-level collaborative dust suppression according to claim 1, wherein, The spiral deflector assembly (1) is composed of a plurality of spiral deflectors (11) combined into a spiral structure.

3. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-level collaborative dust suppression according to claim 2, wherein, The spiral angle of the spiral deflector (11) is 30° to 60°.

4. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-level collaborative dust suppression according to claim 2, characterized in that The pitch gradient of the spiral deflector (11) gradually increases in the axial direction, and the calculation expression of the pitch gradient of the spiral deflector (11) is: d n = d0 + k·L where d n is the spacing of the n-th spiral deflector (11), d0 is the thickness of the spiral deflector (11), k is the gradient change rate, and L is the total length of the spiral deflector assembly (1), with the unit of mm.

5. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-level collaborative dust suppression according to claim 1, wherein, The surface of the spiral deflector assembly (1) is sandblasted with a roughness Ra = 3.2 μm ± 0.5 to enhance the effect of suppressing air flow disturbance in the deflector deceleration area.

6. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-stage collaborative dust suppression according to claim 1, characterized in that, The flexible sealing curtain (2) is a three-layer composite structure, where the outer layer is a wear-resistant layer, the middle layer is a reinforcing layer composed of a woven mesh, and the inner layer is a sealing layer composed of rubber.

7. An anti-dust device for the coal dropping pipe of an Euro silo based on multi-level collaborative dust suppression according to claim 6, characterized in that, The stress balance calculation formula of the composite structure of the flexible sealing curtain (2) is: Where, σ max is the maximum stress, E i is the elastic modulus of the i-th layer, t i is the thickness of the i-th layer, and ∈ is the strain.

8. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-level collaborative dust suppression according to claim 1, characterized in that, The flexible sealing curtain (2) is composed of a plurality of petal-shaped segments, and a counterweight (4) is connected below each petal-shaped segment. The mass of the counterweight (4) satisfies: m = 0.2·L In the formula, m is the mass of the counterweight (4), and L is the unilateral length of the flexible sealing curtain (2).

9. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-level collaborative dust suppression according to claim 1, characterized in that, The adjustment expression of the opening and closing gap of the flexible sealing curtain (2) is: δ(t) = 40·(1 - e -0.015Q(t) ) + 10 In the formula, δ(t) is the opening and closing gap of the flexible sealing curtain (2) at time t, and the adaptive adjustment range is 10 mm to 50 mm, and Q(t) is the coal flow rate at time t.

10. The dust suppression device for the coal dropping pipe of the Euro bin based on multi-level collaborative dust suppression according to claim 1, characterized in that, It also includes a curtain frame (5). The curtain frame (5) is welded into an annular support structure by square pipes, and the upper end of the flexible sealing curtain (2) is connected to the curtain frame (5) through a U-shaped clamp.

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