Wear-resistant structure of desulfurization slurry circulating pump

Abstract

The utility model provides a wear-resistant structure of a desulfurization slurry circulating pump, and aims to solve the technical problem that an existing slurry circulating pump is easily scoured by a medium, corroded and cracked. The wear-resistant structure comprises: an inlet pipeline connected with an inlet of the slurry circulating pump, the axis of the inlet pipeline being La; the right-handed flow guide plates are uniformly distributed in the inlet pipeline, and connecting lines Lb are formed at the joints of the right-handed flow guide plates and the inner wall of the inlet pipeline; the plurality of left-handed flow guide plates are uniformly distributed in the inlet pipeline, and connecting lines Lc are formed at the joints of the left-handed flow guide plates and the inner wall of the inlet pipeline; the left-handed flow guide plate and the right-handed flow guide plate are distributed in a staggered mode, the left-handed flow guide plate and the right-handed flow guide plate are overlapped in the axial direction, the left-handed flow guide plate is located below the right-handed flow guide plate, and the included angle between La and Lb is larger than the included angle between La and Lc. The wear-resistant structure has the advantages that the scouring strength of a medium to the slurry circulating pump is reduced, and the service life of the slurry circulating pump is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a desulfurization slurry circulating pump, concretely relates to a wear -resisting structure of desulfurization slurry circulating pump. BACKGROUND

[0002] In the desulfurization section of boiler system, slurry circulating pump is the core equipment of wet desulfurization process, and it undertakes the key task of continuously conveying high concentration gypsum slurry (solid content 15%-25%) to the spray layer of absorption tower.

[0003] The pump body is in the operation of extreme working condition environment of strong corrosion and high wear for a long time, and its failure mechanism mainly shows that: the calcium sulfite crystal (particle size 50-200 microns) that is not completely oxidized in the gypsum slurry has the continuous micro-cutting effect on the overcurrent part of the pump body under the turbulent state of the flow velocity of 2-3 m / s; meanwhile, the acid corrosion caused by the PH value fluctuation (4.5-5.5) of the slurry and the synergistic effect of chloride ion (Cl concentration >20000ppm) accelerate the intergranular corrosion of the metal matrix.

[0004] The existing pump body is mostly cast by ordinary duplex stainless steel (such as 1.4517), and there is a significant difference between the surface hardness and the hardness of slurry particles, so that the annual average wear of impeller flow passage, volute tongue and other parts reaches 8-12 mm.

[0005] The actual operation data show that when the local wall thickness is thinned to 60% of the initial value (about 18-24 months), stress cracking will occur and leakage accidents will be caused, forcing the system to be non-planned shutdown for more than 72 hours for maintenance. The current offline surfacing repair process needs to consume about 15kg / repair of ER2594 welding material, and the on-site machining time is as long as 120 working hours, and the running period of the repaired equipment can only be restored to 65%-70% of that of the new one. UTILITY MODEL CONTENTS

[0006] In view of the technical problem that the existing slurry circulating pump is easily corroded and cracked by medium scouring, the utility model provides a wear-resistant structure of desulfurization slurry circulating pump, which has the advantages of reducing the scouring intensity of medium on the slurry circulating pump and prolonging the service life of the slurry circulating pump.

[0007] The technical scheme of the utility model is:

[0008] A wear-resistant structure of desulfurization slurry circulating pump, comprising:

[0009] An inlet pipeline is connected with the inlet of the slurry circulating pump, and the axis of the inlet pipeline is La;

[0010] A plurality of right-handed guide vanes are uniformly distributed in the inlet pipeline, and the connection between the right-handed guide vanes and the inner wall of the inlet pipeline forms a connection line Lb;

[0011] A plurality of left-handed guide vanes are uniformly distributed in the inlet pipe, and a connecting line formed by the connection between the left-handed guide vanes and the inner wall of the inlet pipe is Lc;

[0012] The left-handed guide vanes and the right-handed guide vanes are distributed in a staggered manner, the left-handed guide vanes and the right-handed guide vanes have an overlapping portion in the axial direction, the left-handed guide vanes are located below the right-handed guide vanes, and the included angle between La and Lb is greater than the included angle between La and Lc.

[0013] Optionally, an included angle ∠B exists between the plate surface of the right-handed guide vanes and the inner wall of the inlet pipe;

[0014] The right-handed guide vanes are inclined downward, and ∠B < 90°.

[0015] Optionally, an included angle ∠C exists between the plate surface of the left-handed guide vanes and the inner wall of the inlet pipe;

[0016] The left-handed guide vanes are inclined downward, and ∠C < 90°.

[0017] Optionally, 20° < ∠C < ∠B < 60°.

[0018] Optionally, the inclination directions of the left-handed guide vanes and the right-handed guide vanes are opposite.

[0019] Optionally, the thickness of the right-handed guide vanes on the side connected with the inlet pipe is greater than the thickness of the right-handed guide vanes on the other side.

[0020] Optionally, the thickness of the right-handed guide vanes on the side connected with the inlet pipe is 2-3 times the thickness of the right-handed guide vanes on the other side.

[0021] Optionally, the spacing between the right-handed guide vanes and the end of the inlet pipe is D1, and the spacing between the left-handed guide vanes and the end of the inlet pipe is D2.

[0022] D2 is 2-5 times D1.

[0023] Optionally, the width of the right-handed guide vanes is W1, and the width of the left-handed guide vanes is W2, wherein W1 < W2.

[0024] Optionally, W1 = (0.3-0.4) W2.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] First, install the inlet pipe on the inlet of the slurry circulating pump, and install multiple right-handed guide vanes and multiple left-handed guide vanes in the inlet pipe.

[0027] Through the technical scheme, the flow rate of the medium entering the inlet of the slurry circulating pump can be reduced, and the inflow angle of the medium can be adjusted, so that the wear rate of the medium to the inlet of the slurry circulating pump is reduced, and the wear resistance and service life of the slurry circulating pump are improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0030] Figure 2 It is a schematic diagram of the distribution structure of the right-handed guide vane and the left-handed guide vane;

[0031] Figure 3 It is a schematic diagram of the expanded structure of the utility model;

[0032] Figure 4 It is Figure 3 It is a sectional structure schematic diagram of E-E;

[0033] Figure 5 It is Figure 3 It is a sectional structure schematic diagram of F-F. DETAILED DESCRIPTION

[0034] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are considered to be essentially exemplary rather than limiting.

[0035] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship commonly used when the utility model product is placed, or is the orientation or positional relationship commonly understood by the person skilled in the art, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0036] The disclosure below provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of a specific example are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0037] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0038] Embodiment:

[0039] Referring to Figure 1 , Figure 2 and Figure 3 , the embodiment discloses a wear-resistant structure of a desulfurization slurry circulating pump, which comprises an inlet pipeline 10, a right-handed guide vane 20 and a left-handed guide vane 30. Wherein, the inlet pipeline 10 is a hollow cylindrical shape, one end of the inlet pipeline 10 is installed on the inlet of the slurry circulating pump, and a plurality of right-handed guide vanes 20 and a plurality of left-handed guide vanes 30 are installed in the inlet pipeline 10.

[0040] Specifically, all the right-handed guide vanes 20 are inclinedly arranged in the same direction relative to the axis of the inlet pipeline 10, and all the left-handed guide vanes 30 are inclinedly arranged in the other direction relative to the axis of the inlet pipeline 10. Although the inclination directions of the right-handed guide vanes 20 and the left-handed guide vanes 30 are opposite, the overall extension directions of the two are both substantially from one end to the other end of the inlet pipeline 10.

[0041] From the axis direction of the inlet pipe 10, the left-handed guide vanes 30 and the right-handed guide vanes 20 are in a staggered distribution state. From the side of the axis of the inlet pipe 10, the left-handed guide vanes 30 and the right-handed guide vanes 20 have overlapping parts, and in the actual three-dimensional view, the left-handed guide vanes 30 and the right-handed guide vanes 20 are in a state of mutual separation.

[0042] The axis of the above-mentioned inlet pipe 10 is La, the connecting line of the connecting part of the right-handed guide vanes 20 and the inner wall of the inlet pipe 10 is Lb, and the connecting line of the connecting part of the left-handed guide vanes 30 and the inner wall of the inlet pipe 10 is Lc. After projecting the connecting lines Lb and Lc on the plane where La is located, the included angle between the connecting line Lb and La is greater than the included angle between the connecting line Lc and La.

[0043] In the present embodiment, first, the inlet pipe 10 is installed on the inlet of the slurry circulating pump, and a plurality of right-handed guide vanes 20 and a plurality of left-handed guide vanes 30 are installed in the inlet pipe 10. Then, through special design of the right-handed guide vanes 20 and the left-handed guide vanes 30, an included angle between the two and the axis of the inlet pipe 10 is generated, and the positions of the two are limited, the right-handed group focuses on the front section of coarse particle separation, and the left-handed group is responsible for the rear section of flow state stability, and the flow field is smoothly transitioned through the overlapping area.

[0044] Through the technical scheme, the flow rate of the medium entering the inlet of the slurry circulating pump can be reduced, and the inflow angle of the medium can be adjusted, so that the wear speed of the medium to the inlet of the slurry circulating pump is reduced, and the wear resistance and service life of the slurry circulating pump are improved.

[0045] In one specific embodiment:

[0046] Referring to Figure 4 and Figure 5 , there is an included angle ∠B between the plate surface of the right-handed guide vanes 20 and the inner wall of the inlet pipe 10, and an included angle ∠C between the plate surface of the left-handed guide vanes 30 and the inner wall of the inlet pipe 10.

[0047] Among them, ∠B<90°, ∠C<90°, it should be noted that ∠B and ∠C both refer to the included angle with the axis La extending to one end of the pump body. In addition, the right-handed guide vanes 20 and the left-handed guide vanes 30 are inclined downward.

[0048] The right-handed guide vanes 20 make the coarse particles (>1mm) in the slurry move outward, and the capture rate of particles greater than 1mm is >85%, and the coarse particles obtain an outward speed of 0.8-1.2m / s.

[0049] The left-rotating guide vane 30 eliminates the rotational momentum generated by the right-rotating guide vane, and the turbulence intensity is reduced from 18% to 6%, the flow uniformity (uniformity index) is improved by about 58.6%, and a centripetal velocity of 0.3-0.5 m / s is applied to the <0.5 mm fine particles to maintain their axial flow state.

[0050] By setting the right-rotating guide vane 20 and the left-rotating guide vane 30, the impact angle of fine particles on the pump casing is reduced from 45° to 15°, and the wear rate of the impeller is reduced by 70%.

[0051] Preferably, 20° < ∠C < ∠B < 60°.

[0052] Generally, ∠B = 45°, which is the maximum centrifugal force and axial flow balance point.

[0053] ∠C = 30°: The 30° angle makes the fluid axial velocity Vz = v·cos30° ≈ 0.866v and the circumferential velocity Vt = v·sin30° = 0.5v, so that the axial flow velocity is reduced by 14% (compared to the 45° angle), reducing the direct impact wear of particles on the impeller. The 30° angle plays a role in reducing particle impact energy and frequency, reducing turbulence dissipation and pressure loss, and suppressing vibration and cavitation through the triad of flow velocity decomposition-pressure recovery-momentum balance,

[0054] In another specific embodiment:

[0055] The thickness of the right-rotating guide vane 20 on the side connected to the inlet pipe 10 is greater than the thickness on the other side. By gradually changing the blade thickness, the turbulent kinetic energy is reduced by about 55.6%, reducing particle resuspension.

[0056] Preferably, the thickness of the right-rotating guide vane 20 on the side connected to the inlet pipe 10 is 2-3 times the thickness on the other side. For example, from 8 mm to 3 mm.

[0057] By setting the right-rotating guide vane 20, the central flow velocity of the fluid is higher than the peripheral flow velocity (2.8 m / s → 1.5 m / s), forming a velocity barrier to prevent coarse particles from entering the impeller.

[0058] In another specific embodiment:

[0059] The distance between the right-rotating guide vane 20 and the end of the inlet pipe 10 is D1, and the distance between the left-rotating guide vane 30 and the end of the inlet pipe 10 is D2. By this design, the top end of the right-rotating guide vane 20 is located above the top end of the left-rotating guide vane 30, and by controlling the length of the right-rotating guide vane 20 and the left-rotating guide vane 30, the right-rotating guide vane 20 and the left-rotating guide vane 30 produce an overlapping portion in the direction perpendicular to the axis of the inlet pipe 10, achieving smooth transition of the flow field.

[0060] Preferably, D2 is 2-5 times of D1, such as D1=50mm, D2=200mm.

[0061] In another specific embodiment,

[0062] The width of the right-handed guide vane 20 is W1, and the width of the left-handed guide vane 30 is W2, wherein W1W2. The short guide path and large inclination angle of the right-handed guide vane 20 generate strong centrifugal force, and the long guide path and small inclination angle of the left-handed guide vane 30 establish an axial pressure gradient.

[0063] Preferably, W1=(0.3-0.4)W2, the width of the right-handed guide vane 20 and the width of the left-handed guide vane 30 form a golden ratio (0.75), giving consideration to separation efficiency and energy consumption.

[0064] The dual-rotation guide system realizes the triple synergy of physical separation-momentum balance-energy optimization.

[0065] The above-described embodiments only express the specific implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A wear resistant construction for a desulfurization slurry circulating pump characterized by, It comprises: an inlet pipe connected to the inlet of the slurry circulating pump, the axis of the inlet pipe being La; a plurality of right-handed guide vanes uniformly distributed in the inlet pipe, the connection between the right-handed guide vanes and the inner wall of the inlet pipe forming a connection line Lb; a plurality of left-handed guide vanes uniformly distributed in the inlet pipe, the connection between the left-handed guide vanes and the inner wall of the inlet pipe forming a connection line Lc; wherein the left-handed guide vanes and the right-handed guide vanes are distributed in a staggered manner, the left-handed guide vanes and the right-handed guide vanes have an overlapping portion in the axial direction, the left-handed guide vanes are located below the right-handed guide vanes, the included angle between La and Lb is greater than the included angle between La and Lc.

2. The wear-resistant structure of the desulfurization slurry circulating pump according to claim 1, wherein: the right-handed guide vanes have an included angle ∠B with the inner wall of the inlet pipe; wherein ∠B < 90°, and the right-handed guide vanes are inclined downward.

3. The wear-resistant structure of the desulfurization slurry circulating pump according to claim 2, wherein: the left-handed guide vanes have an included angle ∠C with the inner wall of the inlet pipe; wherein ∠C < 90°, and the left-handed guide vanes are inclined downward.

4. The wear resistant construction of a desulfurization slurry circulating pump of claim 3, wherein, 20° < ∠C < ∠B < 60°.

5. The wear resistant construction of a desulfurization slurry circulating pump of claim 3, wherein, The inclination directions of the left-handed guide vanes and the right-handed guide vanes are opposite.

6. The wear resistant construction of a desulfurization slurry circulating pump of claim 1, wherein, The thickness of the right-handed guide vanes on the side connected to the inlet pipe is greater than the thickness on the other side.

7. The wear structure of the desulfurization slurry circulating pump according to claim 6, characterized in that, The thickness of the right-handed guide vanes on the side connected to the inlet pipe is 2-3 times the thickness on the other side.

8. The wear-resistant structure of the desulfurization slurry circulating pump according to claim 1, wherein: the distance between the right-handed guide vanes and the end of the inlet pipe is D1, and the distance between the left-handed guide vanes and the end of the inlet pipe is D2; wherein D2 is 2-5 times D1.

9. The wear resistant construction of a desulfurization slurry circulating pump of claim 1 wherein, The width of the right-handed guide vanes is W1, and the width of the left-handed guide vanes is W2, wherein W1 < W2.

10. The wear structure of the desulfurization slurry circulating pump according to claim 9, characterized in that, W1 = (0.3-0.4) W2.

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