Slurry pipeline energy dissipation pore plate, system and method

Abstract

The invention discloses an energy dissipation pore plate for a slurry pipeline. The energy dissipation pore plate comprises a flange assembly, a wear-resistant part, a shell and a winding type gasket, the flange assembly comprises two flanges which are arranged in an axial symmetry mode, the flanges are in a hubbed butt welding protruding face type, the necks are fixedly connected with the slurry pipeline in a sealed mode, and the peripheries of the two flanges are connected through a fastening connecting piece. The shell and the wear-resistant part are both of a hollow annular structure, the section of the shell and the section of the wear-resistant part are both in an L shape, the shell and the wear-resistant part are combined to form a middle annular structure with a cavity and then clamped between the two flanges, and the diameter of the cavities of the two flanges is larger than that of the cavity of the middle annular structure; the shell has different thicknesses, apertures and chamfers, so that the shell can be tightly assembled with a wear-resistant part; the inner corner of the shell is a round corner; the winding type gasket is in a circular ring shape and is arranged on the connecting face of the flange, the shell and the abrasion-resistant part. The invention further discloses a corresponding method and system. Flexible selection of the common energy dissipation system and the standby energy dissipation system can be guaranteed through the energy dissipation main path and the energy dissipation bypass. The wear resistance of the system is improved, and the service life of the system is prolonged; and stable operation of the energy dissipation station under different working conditions is met.

Description

Technical Field

[0001] The invention relates to the field of slurry conveying pipeline technology and equipment, and in particular to a slurry pipeline energy dissipation orifice plate and an energy dissipation device used therein. Background Art

[0002] The slurry pipeline transportation technology uses water as a carrier, washes or homogenizes the mined ore, grinds it into a slurry with a suitable particle size distribution and concentration, and then delivers it to the end user through a pipeline via a high-pressure pump. It is essentially a solid-liquid two-phase flow. In the slurry transportation system, due to the large drop of the cross-country pipeline or the change of the resistance along the way caused by the system operation system, the slurry in the downhill section has residual potential energy in addition to overcoming the pipeline resistance, thereby forming an unsatisfied pipe flow on this section of the pipeline. If no measures are taken to eliminate the excess potential energy, the slurry flow rate in the pipeline will gradually accelerate from small to large from top to bottom, which is called accelerated flow. Accelerated flow will seriously wear the pipeline and reduce the service life of the pipeline. Accelerated flow will also cause pipeline cavitation, vibration, water hammer and vacuum blockage, etc., which will seriously endanger the stable and safe operation of the slurry transportation system. The present invention can extend the service life of the slurry transportation system, improve the safety of the system, and reduce the noise in the working environment. It is of great significance to the green production and efficient production of slurry pipelines. Summary of the invention

[0003] In view of the problems or defects in the prior art, the present invention aims to solve the problem that the slurry pipeline transportation system in the prior art is prone to generate accelerated flow, which causes wear of the pipeline, reduces the service life of the pipeline, and causes pipeline cavitation, vibration, water hammer and vacuum blockage.

[0004] In order to achieve the above-mentioned purpose, the present invention relates to a slurry pipeline energy dissipation orifice plate, comprising a flange assembly, a wear-resistant part, a shell and a wound gasket.

[0005] The flange assembly includes two axially symmetrically arranged flanges, the flanges are of the neck-welded protruding face type, the neck is fixedly and sealedly connected to the slurry pipeline, and the outer peripheries of the two flanges are connected by fastening connectors; both the shell and the wear-resistant part are hollow annular structures, and their cross-sections are L-shaped. The two are combined to form a middle annular structure with a cavity, which is clamped in the middle by the two flanges, and the diameter of the cavity of the two flanges is larger than the diameter of the cavity of the middle annular structure.

[0006] The shell is tightly assembled with the wear-resistant parts; the inner corners of the shell are rounded; the service life under vibration conditions can be further improved. The main function of the shell is to provide support for the wear-resistant parts and meet the energy dissipation requirements of the orifice plate in the slurry conveying system.

[0007] The spiral wound gasket is annular and is arranged on the connection surface of the flange, the shell and the wear-resistant part. The flange surface has a specific roughness to ensure compatibility with the gasket and achieve a high standard of sealing. The spiral wound gasket can further improve the sealing strength of the orifice plate and prevent slurry leakage caused by sealing failure.

[0008] The fastening connector comprises a stud passing through the disc surfaces of the two flanges, the bottom of the stud is sleeved with a hexagonal nut for locking the two flanges; a flat washer and a spring washer are also arranged on the upper end of the hexagonal nut.

[0009] Furthermore, the density of the wear-resistant part is greater than 3.05 g / cm 3 , hardness greater than 2700HV, through granulation, isostatic pressing, sintering and precision blank processing and other process processes; during processing and manufacturing, the wear-resistant parts are guaranteed to be free of cracks, voids and deformities; the wear-resistant parts are manufactured as a whole.

[0010] Furthermore, the wear-resistant parts have different chamfers, thicknesses and apertures at different positions in the slurry pipeline, and the aperture ratio

[0011] As another aspect of the present invention, it also relates to a slurry pipeline energy dissipation system, which applies the above-mentioned slurry pipeline energy dissipation orifice plate, including a slurry pipeline assembly, an energy dissipation main pipeline assembly, an energy dissipation bypass pipeline assembly, a post-station pipeline assembly and a slurry storage tank pipeline assembly.

[0012] The slurry pipeline assembly comprises a slurry pipeline, on which a first electric ball valve, a first pressure transmitter and a pig receiving port are arranged in sequence.

[0013] The energy dissipation main line pipeline assembly includes an energy dissipation main line, one end of which is connected to the incoming slurry pipeline between the first pressure transmitter and the pig receiving port; the energy dissipation main line is sequentially provided with a second electric ball valve, at least one fixed energy dissipation orifice plate and at least one energy dissipation ring structure; each energy dissipation ring structure includes an electric ball valve mounted on the energy dissipation main line and an inverted U-shaped energy dissipation ring mounted on the energy dissipation main line on both sides of the electric ball valve; the inverted U-shaped energy dissipation ring is provided with an adjustable energy dissipation orifice plate and an adjustable energy dissipation vacant device, the energy dissipation main line at the front end of the inverted U-shaped energy dissipation ring is provided with a pressure transmitter, and the energy dissipation main line on the outlet side of the last energy dissipation ring structure is provided with an electric ball valve;

[0014] The fixed energy dissipation orifice plate refers to the energy dissipation orifice plate installed in the transverse pipeline (not the vertical energy dissipation ring) on ​​the energy dissipation main road and the energy dissipation bypass road; the adjustable energy dissipation orifice plate refers to the energy dissipation orifice plate installed on the inverted U-shaped energy dissipation ring; the structure of the fixed energy dissipation orifice plate and the adjustable energy dissipation orifice plate is the same as that of the slurry pipeline energy dissipation orifice plate, but the chamfer, thickness and aperture of each wear-resistant part at different positions in the slurry pipeline can be the same or different;

[0015] The energy dissipation bypass pipeline assembly includes an energy dissipation bypass, one end of which is connected to the energy dissipation main path at the front end of the second electric ball valve, and the end of which is connected to the end of the energy dissipation main path; at least one fixed energy dissipation orifice plate and at least one pressure transmitter are arranged on the energy dissipation bypass, and an electric ball valve is also arranged at the end thereof;

[0016] The post-station pipeline assembly includes a post-station pipeline, the front end of which is connected to the end of the energy dissipation main road, and a concentration transmitter and a flow transmitter are arranged on the post-station pipeline; the rear ends of the concentration transmitter and the flow transmitter are both provided with a pressure transmitter;

[0017] The slurry storage tank pipeline assembly comprises a slurry storage tank pipeline, the front end of the slurry storage tank pipeline is connected with the end of the pipeline behind the station, and the end thereof is connected with the slurry storage tank; an electric knife gate valve is arranged on the slurry storage tank pipeline.

[0018] Furthermore, it also includes a pre-station blasting pipeline assembly, the pre-station blasting pipeline includes a pre-station blasting pipeline, the front end of the pre-station blasting pipeline is connected to the pipeline in front of the junction of the self-energy dissipation main line and the energy dissipation bypass line, and the end of the pre-station blasting pipeline is connected to the slurry storage tank; the pre-station blasting pipeline is arranged with a high-pressure manual ball valve and a high-pressure bursting disc.

[0019] Furthermore, it also includes a post-station blasting pipeline assembly, which includes a post-station blasting pipeline, a front end of the post-station blasting pipeline is connected to the post-station pipeline, and a terminal end of the post-station blasting pipeline is connected to the slurry storage tank.

[0020] It further includes a dehydration and thickening integrated pipeline, including a dehydration and thickening integrated pipeline, the front end of which is connected to the pipeline after the merging point of the slurry storage tank pipeline and the post-station pipeline, and the dehydration and thickening integrated pipeline is provided with an electric knife gate valve.

[0021] Furthermore, it also includes a flushing water pipeline assembly, which includes a flushing water pump and a flushing water pipeline connected to the output end of the flushing water pump; the flushing water pipeline is connected to the energy dissipation main line, the post-station pipeline, the pre-station blasting pipeline arranged at the front end of the energy dissipation main line, and the post-station blasting pipeline arranged at the rear end of the post-station pipeline through different branch pipelines, and electric knife gate valves are arranged on the different branch pipelines.

[0022] Furthermore, the fixed energy dissipation orifice plate and the adjustable energy dissipation orifice plate use the following formula to calculate the energy dissipation pressure drop head Δp:

[0023]

[0024] k=f(β,α,γ,R e )

[0025] The total pressure drop eliminated: P 总 =A*Δp1+B*Δp2......+N*Δp n

[0026] In the above formula: P 总 -Total pressure drop eliminated, mH2O;

[0027] where Δp1, Δp2, ..., Δp n is the pressure drop eliminated by the energy dissipation orifice plates with different body parameters in the pipeline, A, B, ..., N are the corresponding arrangement quantities of the energy dissipation orifice plates with different body parameters;

[0028] In the above formula: Δp-energy dissipation pressure drop head, mH2O; ρ-slurry density, m 3 / h; k-energy dissipation coefficient; ν-slurry flow rate in the pipeline, m / s; α-thickness-diameter ratio; β-aperture ratio; γ-angle-diameter ratio; R e -Reynolds number; the energy dissipation coefficient k is a function of the thickness-to-diameter ratio α, aperture ratio β, angle-to-diameter ratio γ and Reynolds number. The functional relationship is established through fluid mechanics and experimental fitting. The specific method is as follows:

[0029] Through experiments, data on energy dissipation pressure drop head Δp and flow velocity v under different conditions, namely chamfer, thickness, aperture and Reynolds number of wear-resistant parts at different positions are collected. The energy dissipation coefficient k is fitted using the experimental data. Based on the fitting results, a mathematical model is established to describe the calculation method of k and additional experimental data is used to verify the accuracy of the model.

[0030] Furthermore, the energy dissipation coefficient k is calculated using the following formula:

[0031]

[0032] C0, C1, C2, and C3 are correction coefficients obtained by fitting experimental data.

[0033] ΔT is the temperature change, relative to the standard operating temperature;

[0034] Δρ is the change in slurry density relative to the standard operating density;

[0035] Δμ is the change in slurry dynamic viscosity relative to the standard operating viscosity;

[0036] is the basic energy dissipation coefficient, which represents the relationship between the energy dissipation coefficient and the aperture ratio, thickness ratio, angle ratio and Reynolds number under standard operating conditions; They are temperature correction term, density correction term and viscosity correction term respectively.

[0037] As another aspect of the present invention, it also relates to an energy dissipation method of a slurry pipeline energy dissipation system, comprising the following steps:

[0038] Step 1: Install multiple slurry pipeline energy dissipation orifice plates on the energy dissipation main path or energy dissipation bypass path of the slurry conveying pipeline;

[0039] Step 2: According to the operating parameters of the slurry conveying system, including slurry density, flow rate, and concentration, select a slurry pipeline energy dissipation orifice plate with appropriate body parameters, including aperture ratio β, thickness-diameter ratio α, and angle-diameter ratio γ;

[0040] Step 3: Control the flow direction of the slurry through the electric ball valve, so that the slurry passes through the energy dissipation main path or the energy dissipation bypass, and dissipates energy through the slurry pipeline energy dissipation orifice plate;

[0041] Step 4: Use a pressure transmitter to monitor the pressure change before and after energy dissipation, and a concentration transmitter and a flow transmitter to monitor the concentration and flow of the slurry;

[0042] Step 5: According to the monitoring data, adjust the position of the adjustable energy dissipation orifice plate or replace the energy dissipation orifice plate with different body parameters to adapt to different working conditions;

[0043] Step 6: When necessary, flush the energy dissipation orifice plate through the flushing water pipeline to prevent clogging;

[0044] Step 7: When the system is being repaired or the energy dissipation orifice is replaced, the slurry flow direction is controlled by an electric knife gate valve to ensure safe operation.

[0045] Compared with the prior art, the present invention has the following effects:

[0046] (1) The slurry pipeline energy dissipation orifice plate and system of the present invention can ensure flexible selection of the common energy dissipation system and the backup energy dissipation system through the energy dissipation main path and the energy dissipation bypass;

[0047] (2) The slurry pipeline energy dissipation orifice plate and system of the present invention can avoid blockage of the energy dissipation device through the flushing water system, and can monitor the stable operation of the slurry conveying system in real time through the pressure transmitter, concentration transmitter and flow transmitter, and provide real-time data support for the operation of the energy dissipation station;

[0048] (3) The slurry pipeline energy dissipation orifice plate and system of the present invention use silicon carbide wear-resistant material inside the energy dissipation orifice plate, and the density is greater than 3.05g / cm 3 , hardness greater than 2700HV, on the basis of eliminating the accelerated flow of the slurry conveying system, the wear resistance and service life of the system are improved;

[0049] (4) The slurry pipeline energy dissipation orifice plate and system of the present invention are designed with reasonable thickness, aperture and chamfer based on the slurry pipeline energy dissipation hydraulic model. The specific thickness, aperture and chamfer values ​​effectively ensure the stable operation of the slurry conveying system under various working conditions such as slurry conveying, water conveying, slurry water switching, flow rate, concentration changes, etc.;

[0050] (5) The slurry pipeline energy dissipation orifice plate and system of the present invention can meet the stable operation of the energy dissipation station under different working conditions by inserting or cutting out the adjustable energy dissipation orifice plate, the fixed energy dissipation orifice plate and the energy dissipation vacant device; it effectively solves the accelerated flow problem of the large drop slurry conveying pipeline, reduces pipeline cavitation, vibration, water hammer and vacuum blockage, etc., and ensures the stable and safe operation of the slurry conveying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a cross-sectional view of a slurry pipeline energy dissipation orifice plate proposed in a preferred embodiment of the present invention;

[0052] Figure 2 It is a three-dimensional structural diagram of a slurry pipeline energy dissipation orifice plate proposed in a preferred embodiment of the present invention;

[0053] Figure 3 It is a schematic diagram of the cross-sectional structure of the wear-resistant parts in the energy dissipation orifice plate of the slurry pipeline proposed in a preferred embodiment of the present invention;

[0054] Figure 4 It is a three-dimensional structural diagram of the energy dissipation device proposed in a preferred embodiment of the present invention;

[0055] Figure 5 is a top view of the energy dissipation device proposed in a preferred embodiment of the present invention;

[0056] Figure 6 It is a front view of the first energy dissipation ring of the energy dissipation device proposed in the preferred embodiment of the present invention.

[0057] In the figure: 11-first fixed energy dissipation orifice plate, 12-first adjustable energy dissipation orifice plate, 13-second adjustable energy dissipation vacant device, 14-second fixed energy dissipation orifice plate, 15-third fixed energy dissipation orifice plate, 16-fourth fixed energy dissipation orifice plate, 17-first adjustable energy dissipation vacant device, 18-second adjustable energy dissipation vacant device;

[0058] 21-first electric ball valve, 22-second electric ball valve, 23-third electric ball valve, 24-fourth electric ball valve, 25-fifth electric ball valve, 26-sixth electric ball valve, 27-seventh electric ball valve;

[0059] 31 - first pressure transmitter, 32 - second pressure transmitter, 33 - third pressure transmitter, 34 - fourth pressure transmitter, 35 - fifth pressure transmitter, 36 - sixth pressure transmitter;

[0060] 41-high pressure manual ball valve, 42-low pressure manual ball valve;

[0061] 51-high pressure bursting disc, 52-low pressure bursting disc;

[0062] 61 – the first electric knife gate valve, 62 – the second electric knife gate valve, 63 – the third electric knife gate valve, 64 – the fourth electric knife gate valve, 65 – the fifth electric knife gate valve, 66 – the sixth electric knife gate valve, 67 – the seventh electric knife gate valve;

[0063] 71 – slurry storage tank, 72 – storage tank ladder, 73 – agitator;

[0064] 8-Flush the water pump;

[0065] 91 – concentration transmitter, 92 – flow transmitter;

[0066] 101-slurry pipeline, 102-pipe cleaning device receiving port, 103-energy dissipation bypass, 104-energy dissipation main pipeline, 105-post-station pipeline, 106-dehydration-thickening integrated pipeline, 107-slurry storage tank pipeline, 108-pre-station blasting pipeline, 109-post-station blasting pipeline, 110-flushing water pipeline;

[0067] 1001-flange, 1002-wear-resistant part, 1003-stud, 1004-housing, 1005-flat washer, 1006-hexagonal nut, 1007-wound gasket, 1008-spring washer. 1021 is the chamfer of the wear-resistant part 1002, 1022 is the thickness of the wear-resistant part 1002, and 1023 is the aperture of the wear-resistant part 1002. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0069] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0070] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0071] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0072] In order to solve the problem of preventing and controlling accelerated flow in a slurry conveying pipeline in the prior art, the present invention provides a slurry pipeline energy dissipation orifice plate and an energy dissipation device used therein.

[0073] Example 1

[0074] Please refer to Figure 1-Figure 3 This embodiment relates to a slurry pipeline energy dissipation orifice plate, including a flange 1001, a wear-resistant part 1002, a stud 1003, a shell 1004, a flat washer 1005, a hexagonal nut 1006, a spiral wound gasket 1007 and a spring washer 1008. The energy dissipation orifice plate is installed inside the slurry conveying pipeline. The main function of installing it on the horizontal main pipeline is to prevent the occurrence of accelerated flow in the pipeline conveying solid-liquid two-phase flow such as coal and iron ore, so as to avoid the accelerated flow from endangering the stability of the slurry conveying system.

[0075] Flange 1001 consists of two pieces, the upper and lower pieces. The flange adopts a raised face type with a neck butt-weld. The neck is connected to the pipeline by welding. The connection of the neck butt-weld flange is not easy to deform and has a good sealing effect.

[0076] The flange sealing surface is equipped with a spiral wound gasket 1007 in the shape of a ring, located at the connection surface of the flange 1001, the housing 1004 and the wear-resistant part 1002. The flange surface has a specific roughness to ensure compatibility with the gasket and achieve a high standard of sealing. The spiral wound gasket can further enhance the sealing strength of the orifice plate and prevent slurry leakage caused by sealing failure.

[0077] The core components of the slurry pipeline energy dissipation orifice plate mainly include the wear-resistant part 1002 and the shell 4.

[0078] Wear-resistant parts 1002 are made of wear-resistant materials. In the field of metal slurry such as iron ore concentrate, silicon carbide is generally used. It has the advantages of high hardness, strong wear resistance and good stability. Its density is greater than 3.05g / cm 3 , hardness greater than 2700HV, during processing and manufacturing, it must be ensured that the wear-resistant parts are free of cracks, voids and deformities.

[0079] The wear-resistant parts have different chamfers 1021, thicknesses 1022 and apertures 1023. The specific chamfers 1021, thicknesses 1022 and apertures 1023 are determined by calculating the slurry pipeline energy dissipation hydraulic model. The main function is to meet the requirements of different line drops, different weight concentrations and different working conditions (slurry delivery, water delivery, slurry pushing water and water pushing slurry, etc.).

[0080] Specifically, the wear-resistant parts aperture ratio The aperture ratio β, thickness-to-diameter ratio α and angle-to-diameter ratio γ are the key parameters that determine the orifice plate energy dissipation slurry head and need to be determined based on the actual engineering situation and the energy dissipation hydraulic model.

[0081] Wear-resistant parts 1002 are manufactured as a whole through granulation, isostatic pressing, sintering and precision blank processing. The rigorous manufacturing process is mainly to improve the performance and quality of the product, thereby increasing the service life of the orifice plate in the slurry conveying system.

[0082] The shell 1004 is made of 316 stainless steel or stainless steel with better performance than 316. It is made by turning on the basis of integral forging. The shell 1004 has different thicknesses, apertures and chamfers, which can achieve close assembly with the wear-resistant part 1002. The inner corners of the shell 1004 are rounded, which can further improve the service life of the orifice plate under vibration conditions. The main function of the shell 1004 is to provide support for the wear-resistant part 1002 and meet the energy dissipation requirements of the orifice plate in the slurry conveying system.

[0083] The core components of the slurry pipeline energy dissipation orifice plate, the wear-resistant part 1002 and the shell 1004, are bonded by strong industrial adhesive and clamped by a matching flange clamp, which ensures the tight connection between the wear-resistant part and the orifice plate shell, so that the orifice plate will not fall off under harsh working conditions.

[0084] As a preferred solution, the fastening connectors of the single-hole energy dissipation orifice plate of the slurry pipeline include a stud 1003, a flat washer 1005, a hexagonal nut 1006 and a spring washer 1008.

[0085] The studs 1003 and the hexagonal nuts 1006 are used to connect the two flanges 1001. The quantity and model are determined by the standard. The spring washers 1008 increase the friction between the nuts 1006 and the bolts 1003 to prevent the nuts 1006 from falling off. The quantity of nuts 1006 and bolts 1003 matches, and the model is determined by the specification standard.

[0086] The energy dissipation device based on the above-mentioned slurry pipeline energy dissipation orifice plate is described in detail below.

[0087] Please refer to Figure 4-Figure 6 As another aspect of the embodiment of the present invention, it also involves an energy dissipation device which mainly includes a slurry pipeline energy dissipation orifice plate arranged at different positions, an electric ball valve 2, a pressure transmitter 3, a manual ball valve 4, a bursting disc 5, an electric knife gate valve 6, a slurry storage tank 7, a flushing water pump 8, a concentration transmitter 91, a flow transmitter 92, a pipeline fitting 10, etc.

[0088] The slurry pipeline 101 is connected to the slurry from the headend station and is sent to the energy dissipation station through the first electric ball valve 21 at the entrance of the energy dissipation station. The first electric ball valve 21 is the main control valve of the energy dissipation station, which is used to open or close the line channel. The energy dissipation station is equipped with an energy dissipation main line 104 and an energy dissipation bypass 103. A first pressure transmitter 31 is provided behind the first electric ball valve 21 of the energy dissipation station to monitor the slurry pressure of the line pipeline. At the same time, a pre-station blasting pipeline 108 and a flushing water pipeline are provided at the entrance of the energy dissipation station.

[0089] The energy dissipation main path 104 is the main energy dissipation and circulation channel after the slurry arrives at the headend station. The energy dissipation main path 104 is connected from the first inlet electric ball valve 21, through the second electric ball valve 22 of the energy dissipation main path, through the first fixed energy dissipation orifice plate 11, and the second pressure transmitter 32 is installed behind the first fixed energy dissipation orifice plate 11. The other end of the second pressure transmitter 32 is connected to the first energy dissipation ring of the energy dissipation main path 104. The vertical energy dissipation ring is equipped with a first adjustable energy dissipation orifice plate 12 and a first adjustable energy dissipation vacant device 17 (the energy dissipation vacant device is a structure reserved for the installation of the slurry pipeline energy dissipation orifice plate later). The bottom bypass of the first energy dissipation ring uses a third electric ball valve 23 to control the switch of the bypass flow channel.

[0090] To further explain the energy dissipation ring, take the first energy dissipation ring as an example, the energy dissipation ring is arranged vertically, the top of the energy dissipation ring is a 180° elbow, the incoming and outgoing directions of the elbow are connected to the vertical steel pipe through flanges, and the first adjustable energy dissipation orifice plate 12 and the first adjustable energy dissipation vacant device 17 are installed on the vertical steel pipe. When the third electric ball valve 23 bypassing the bottom of the first energy dissipation ring is opened, the slurry does not enter the first energy dissipation ring, that is, the slurry does not pass through the first adjustable energy dissipation orifice plate 12 and the first adjustable energy dissipation vacant device 17. At this time, the first energy dissipation ring is in the cut-out state and does not participate in energy dissipation. On the contrary, when the third electric ball valve 23 bypassing the bottom of the first energy dissipation ring is closed, the first energy dissipation ring is in the input state and participates in energy dissipation.

[0091] The other end of the first energy dissipation ring is connected to the third pressure transmitter 33, and the other end of the third pressure transmitter 33 is connected to the second energy dissipation ring. The second energy dissipation ring is consistent with the first energy dissipation ring in style and function, and will not be repeated here. Different orifice plates on the energy dissipation ring have different body parameters (aperture ratio β, thickness-to-diameter ratio α, and angle-to-diameter ratio γ). The orifice plate vacant device reserves the orifice plate installation position, and different orifice plates can be installed according to project needs, further increasing the energy adjustment range of the energy dissipation device. According to different flow rates, concentrations, etc., the first energy dissipation ring or the second energy dissipation ring can be withdrawn or put in to achieve the purpose of eliminating different energies.

[0092] The downstream of the second energy dissipation ring is connected to the fifth electric ball valve 25 , and the other end of the fifth electric ball valve 25 is connected to the energy dissipation bypass 103 .

[0093] It should be noted that the energy dissipation bypass 103 is a spare slurry energy dissipation and circulation channel. When the energy dissipation main circuit equipment is overhauled or replaced, the sixth electric ball valve 26 is opened, the second electric ball valve 22 is closed, and the slurry enters the energy dissipation bypass 103 .

[0094] The energy dissipation bypass 103 is connected to the pipeline from the energy dissipation main circuit 104 on the upstream side of the second electric ball valve 22. A sixth electric ball valve 26 is provided at the entrance of the energy dissipation bypass 103. The other side of the sixth electric ball valve 26 is connected to the second fixed energy dissipation orifice plate 14, and the downstream thereof is the fourth pressure transmitter 34. A third fixed energy dissipation orifice plate 15 is provided on the other side of the fourth pressure transmitter 34, and the downstream thereof is the fifth pressure transmitter 35. The downstream of the fifth pressure transmitter 35 is the fourth fixed energy dissipation orifice plate 16, and the downstream of the seventh electric ball valve 27 is connected to the downstream pipeline of the fifth electric ball valve 25 of the energy dissipation main circuit 103.

[0095] After the energy dissipation main line 104 and the energy dissipation bypass 103 merge, a concentration transmitter 91 and a flow transmitter 92 are provided downstream. The concentration is used to monitor the concentration of the slurry pipeline, especially the slurry-water switching condition, and the flow concentration meter is used to monitor the flow change of the slurry pipeline. The other side of the concentration transmitter 91 is provided with a sixth pressure transmitter 36, and the downstream side of the sixth pressure transmitter 36 is provided with a flow transmitter 92. The other side of the flow transmitter 92 is the post-station blasting pipeline 109, the slurry storage tank pipeline 107 and the dehydration-thickening integrated pipeline 106.

[0096] The pre-station blasting pipeline 108 is connected before the junction of the energy dissipation main line 104 and the energy dissipation bypass line 103. A high-pressure manual ball valve 41 is provided on the pre-station blasting pipeline 108. A high-pressure bursting disc 51 is provided on the other side of the high-pressure manual ball valve 41, which can realize the overall overpressure protection of the energy dissipation device. The pre-station blasting pipeline 108 goes to the slurry storage tank 71.

[0097] The post-station blasting pipeline 109 is connected to the junction of the energy dissipation main line 104 and the energy dissipation bypass line 103. A low-pressure manual ball valve 42 is provided on the post-station blasting pipeline 109. A low-pressure bursting disc 52 is provided on the other side of the low-pressure manual ball valve 42 to achieve overpressure protection of the post-station equipment. The post-station blasting pipeline 109 goes to the slurry storage tank 71.

[0098] The slurry storage tank pipeline 107 is connected to the pipeline after the energy dissipation main line 104 and the energy dissipation bypass line 103 merge. An electric knife gate valve 67 is used at the entrance of the slurry storage tank pipeline 107 to control the switch of the pipeline flow channel. The slurry flows to the slurry storage tank 71 through the slurry storage tank pipeline 107 to achieve the function of slurry storage.

[0099] The dehydration-thickening integrated pipeline 106 is connected to the pipeline formed by the confluence of the energy dissipation main line 104 and the energy dissipation bypass line 103. An electric knife gate valve 66 is used at the entrance of the dehydration-thickening integrated pipeline 106 to control the switch of the pipeline flow channel. The slurry in the dehydration-thickening integrated pipeline 106 flows to the dehydration workshop or the thickener. The slurry goes to the dehydration workshop mainly for dehydration of the slurry. When the slurry needs to be thickened, it goes to the thickener.

[0100] The flushing water pipeline includes a flushing water pump 8 and electric knife gate valves 61, 62, 64 and 65. The flushing water pump 8 draws industrial water from the pipeline network in the station. When the system is stopped, the electric knife gate valves at the corresponding points are opened to complete the flushing operation of the energy dissipation station pipeline.

[0101] The pig receiving port 102 is a flange-shaped interface for receiving a pig ball from the pipeline.

[0102] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: the interior of the energy dissipation orifice plate 1 adopts silicon carbide wear-resistant material, which greatly improves the wear resistance and service life of the system on the basis of eliminating the accelerated flow of the slurry conveying system. The rationally designed thickness 1022, aperture 1023 and chamfer 1024 effectively ensure the stable operation of the slurry conveying system under various working conditions such as slurry conveying, water conveying, slurry-water switching, flow rate, concentration changes, etc. The overall layout of the energy dissipation device can ensure flexible selection of the common energy dissipation system and the backup energy dissipation system through the energy dissipation main path 104 and the energy dissipation bypass 103, and can avoid blockage of the energy dissipation device through the flushing water system. The stable operation of the slurry conveying system can be monitored in real time through the pressure transmitter 3, the concentration transmitter 91 and the flow transmitter 92, and provide real-time data support for the operation of the energy dissipation station. The stable operation of the energy dissipation station under different working conditions can be met by the input or output of the adjustable energy dissipation orifice plate, the fixed energy dissipation orifice plate and the energy dissipation vacant device. A slurry pipeline energy dissipation orifice plate and the energy dissipation device used can eliminate the accelerated flow problem of the large drop slurry conveying pipeline, eliminate pipeline cavitation, vibration, water hammer and vacuum blockage, etc., and ensure the stable and safe operation of the slurry conveying system.

[0103] As another aspect of the embodiment of the present invention, it also relates to a method for determining the energy dissipation pressure drop head Δp by a fixed energy dissipation orifice plate or an adjustable energy dissipation orifice plate:

[0104]

[0105] k=f(β,α,γ,R e )

[0106] The total pressure drop eliminated: P 总 =A*Δp1+B*Δp2......+N*Δp n

[0107] In the above formula: P 总 -Total pressure drop eliminated, mH2O;

[0108] where Δp1, Δp2, ..., Δp n is the pressure drop eliminated by the energy dissipation orifice plates with different body parameters in the pipeline, A, B, ..., N are the corresponding arrangement quantities of the energy dissipation orifice plates with different body parameters;

[0109] In the above formula: Δp-energy dissipation pressure drop head, mH2O; ρ-slurry density, m 3 / h; k-energy dissipation coefficient; ν-slurry flow rate in the pipeline, m / s; α-thickness-diameter ratio; β-aperture ratio; γ-angle-diameter ratio; R e -Reynolds number; the energy dissipation coefficient k is a function of the thickness-to-diameter ratio α, aperture ratio β, angle-to-diameter ratio γ and Reynolds number. The functional relationship is established through fluid mechanics and experimental fitting. The specific method is as follows:

[0110] Through experiments, data on energy dissipation pressure drop head Δp and flow velocity v under different conditions, namely chamfer, thickness, aperture and Reynolds number of wear-resistant parts at different positions are collected. The energy dissipation coefficient k is fitted using the experimental data. Based on the fitting results, a mathematical model is established to describe the calculation method of k and additional experimental data is used to verify the accuracy of the model.

[0111] The energy dissipation coefficient k is calculated using the following formula:

[0112]

[0113] C0, C1, C2, and C3 are correction coefficients obtained by fitting experimental data;

[0114] ΔT is the temperature change, relative to the standard operating temperature;

[0115] Δρ is the change in slurry density relative to the standard operating density;

[0116] Δμ is the change in slurry dynamic viscosity relative to the standard operating viscosity;

[0117] is the basic energy dissipation coefficient, which represents the relationship between the energy dissipation coefficient and the aperture ratio, thickness ratio, angle ratio and Reynolds number under standard operating conditions; They are temperature correction term, density correction term and viscosity correction term respectively.

[0118] Another aspect of the present invention is an energy dissipation method for a slurry pipeline energy dissipation system, comprising the following steps:

[0119] Step 1: Install multiple slurry pipeline energy dissipation orifice plates on the energy dissipation main path 104 or the energy dissipation bypass 103 of the slurry conveying pipeline;

[0120] Step 2: According to the operating parameters of the slurry conveying system, including slurry density, flow rate, and concentration, select a slurry pipeline energy dissipation orifice plate with appropriate body parameters, including aperture ratio β, thickness-diameter ratio α, and angle-diameter ratio γ;

[0121] Step 3: Control the flow direction of the slurry through the electric ball valve, so that the slurry passes through the energy dissipation main path 104 or the energy dissipation bypass 103, and passes through the slurry pipeline energy dissipation orifice plate for energy dissipation;

[0122] Step 4: Use the pressure transmitter to monitor the pressure change before and after energy dissipation, and the concentration transmitter 91 and the flow transmitter 92 to monitor the concentration and flow of the slurry;

[0123] Step 5: According to the monitoring data, adjust the position of the adjustable energy dissipation orifice plate or replace the energy dissipation orifice plate with different body parameters to adapt to different working conditions;

[0124] Step 6: When necessary, flush the energy dissipation orifice plate through the flushing water pipeline 110 to prevent clogging;

[0125] Step 7: When the system is being repaired or the energy dissipation orifice is replaced, the slurry flow direction is controlled by an electric knife gate valve to ensure safe operation.

[0126] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0127] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0128] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A slurry pipeline energy dissipation orifice plate, characterized in that: It comprises a flange assembly (1001), a wear-resistant part (1002), a shell (1004) and a wound gasket (1007); The flange assembly (1001) comprises two flanges arranged axially symmetrically, the flanges are of the raised face type with necks butt-welded, the necks are fixedly and sealedly connected to the slurry pipeline, and the outer peripheries of the two flanges are connected by fastening connectors; the shell (1004) and the wear-resistant part (1002) are both hollow annular structures, and their cross-sections are both L-shaped, and the two are combined to form a middle annular structure with a cavity, which is clamped in the middle by the two flanges, and the diameters of the cavities of the two flanges are larger than the diameter of the cavity of the middle annular structure; The shell (1004) and the wear-resistant part (1002) are tightly assembled; the inner corner of the shell (1004) is rounded; The wound gasket (1007) is in the shape of a circular ring and is arranged on the connection surface between the flange (1001), the housing (1004) and the wear-resistant part (1002).

2. The slurry pipeline energy dissipation orifice plate according to claim 1, characterized in that: The wear-resistant part (1002) has a density greater than 3.05 g / cm 3 , hardness greater than 2700HV, through granulation, isostatic pressing, sintering and precision blank processing and other process processes; during processing and manufacturing, the wear-resistant parts are guaranteed to be free of cracks, voids and deformities; the wear-resistant parts are manufactured as a whole.

3. The slurry pipeline energy dissipation orifice plate according to claim 1, characterized in that: The body parameters of the wear-resistant part, namely, chamfer (1021), thickness (1022) and aperture (1023), are defined as follows: A plurality of slurry pipeline energy dissipation orifice plates equipped with wear-resistant parts with different body parameters are arranged in the slurry pipeline.

4. A slurry pipeline energy dissipation system, characterized in that: It applies the slurry pipeline energy dissipation orifice plate described in claim 1, including a slurry pipeline assembly, an energy dissipation main pipeline assembly, an energy dissipation bypass pipeline assembly, a post-station pipeline assembly and a slurry storage tank pipeline assembly; The slurry pipeline assembly comprises a slurry pipeline (101), on which a first electric ball valve (21), a first pressure transmitter (31) and a pig receiving port (102) are arranged in sequence; The energy dissipation main line pipeline assembly comprises an energy dissipation main line (104), one end of which is connected to the slurry pipeline (101) between the first pressure transmitter (31) and the pig receiving port (102); the energy dissipation main line (104) is provided with a second electric ball valve (22), at least one fixed energy dissipation orifice plate (11) and at least one energy dissipation ring structure in sequence; each energy dissipation ring structure comprises an electric ball valve mounted on the energy dissipation main line (104) and an inverted U-shaped energy dissipation ring mounted on the energy dissipation main line on both sides of the electric ball valve; the inverted U-shaped energy dissipation ring is provided with an adjustable energy dissipation orifice plate and an adjustable energy dissipation vacant device, the energy dissipation main line (104) at the front end of the inverted U-shaped energy dissipation ring is provided with a pressure transmitter, and the energy dissipation main line on the outlet side of the last energy dissipation ring structure is provided with an electric ball valve; The fixed energy dissipation orifice plate refers to an energy dissipation orifice plate arranged on the transverse pipeline of the energy dissipation main path and the energy dissipation bypass path; the adjustable energy dissipation orifice plate refers to an energy dissipation orifice plate arranged on an inverted U-shaped energy dissipation ring; the structure of the fixed energy dissipation orifice plate and the adjustable energy dissipation orifice plate is the same as that of the slurry pipeline energy dissipation orifice plate, but the chamfer (1021), thickness (1022) and aperture (1023) of each wear-resistant part at different positions in the slurry pipeline can be the same or different; The energy dissipation bypass pipeline assembly comprises an energy dissipation bypass (103), one end of the energy dissipation bypass (103) is connected to the energy dissipation main path (104) at the front end of the second electric ball valve (22), and the end thereof is connected to the end of the energy dissipation main path (104); at least one fixed energy dissipation orifice plate and at least one pressure transmitter are arranged on the energy dissipation bypass (103), and an electric ball valve is also arranged at the end thereof; The post-station pipeline assembly comprises a post-station pipeline (105), the front end of the post-station pipeline (105) is connected to the end of the energy dissipation main path (104), and a concentration transmitter (91) and a flow transmitter (92) are arranged on the post-station pipeline (105); and pressure transmitters are arranged at the rear ends of the concentration transmitter (91) and the flow transmitter (92); The slurry storage tank pipeline assembly comprises a slurry storage tank pipeline (107), the front end of the slurry storage tank pipeline (107) is connected to the end of the post-station pipeline (105), and the end of the slurry storage tank pipeline (107) is connected to the slurry storage tank (71); an electric knife gate valve is arranged on the slurry storage tank pipeline (107).

5. The slurry pipeline energy dissipation system according to claim 4, characterized in that: It also includes a pre-station blasting pipeline assembly and a post-station blasting pipeline assembly; the pre-station blasting pipeline includes a pre-station blasting pipeline (108); the front end of the pre-station blasting pipeline (108) is connected to the pipeline before the junction of the self-energy dissipation main line (104) and the energy dissipation bypass line 103, and the end of the pre-station blasting pipeline (108) is connected to the slurry storage tank (71); a high-pressure manual ball valve (41) and a high-pressure bursting disc (51) are arranged on the pre-station blasting pipeline (108); The post-station blasting pipeline comprises a post-station blasting pipeline (109), the front end of which is connected to the post-station pipeline (105), and the end of which is connected to the slurry storage tank (71).

6. The slurry pipeline energy dissipation system according to claim 4, characterized in that: The invention also includes a dehydration-thickening integrated pipeline, which includes a dehydration-thickening integrated pipeline (106). The front end of the dehydration-thickening integrated pipeline (106) is connected to the pipeline after the confluence point of the slurry storage tank pipeline (107) and the post-station pipeline (105). The dehydration-thickening integrated pipeline (106) is provided with an electric knife gate valve.

7. The slurry pipeline energy dissipation system according to any one of claims 4 to 6, characterized in that: The invention also comprises a flushing water pipeline assembly, which comprises a flushing water pump (8) and a flushing water pipeline (110) connected to the output end of the flushing water pump; the flushing water pipeline (110) is connected to the energy dissipation main line (104), the post-station pipeline (105), the pre-station blasting pipeline (108) arranged at the front end of the energy dissipation main line, and the post-station blasting pipeline (109) arranged at the rear end of the post-station pipeline through different branch pipelines, and electric knife gate valves are arranged on the different branch pipelines.

8. The slurry pipeline energy dissipation system according to any one of claims 4 to 6, characterized in that: The method for determining the energy dissipation pressure drop head Δp of the fixed energy dissipation orifice plate or the adjustable energy dissipation orifice plate is: k=f(β,α,γ,R e ) The total pressure drop eliminated: P 总 =A*Δp1+B*Δp2......+N*Δp n In the above formula: P 总 -Total pressure drop eliminated, mH2O; where Δp1, Δp2, ..., Δp n is the pressure drop eliminated by the energy dissipation orifice plates with different body parameters in the pipeline, A, B, ..., N are the corresponding arrangement quantities of the energy dissipation orifice plates with different body parameters; In the above formula: Δp-energy dissipation pressure drop head, mH2O; ρ-slurry density, m 3 / h; k-energy dissipation coefficient; ν-slurry flow rate in the pipeline, m / s; α-thickness-diameter ratio; β-aperture ratio; γ-angle-diameter ratio; R e -Reynolds number; the energy dissipation coefficient k is a function of the thickness-to-diameter ratio α, aperture ratio β, angle-to-diameter ratio γ and Reynolds number. The functional relationship is established through fluid mechanics and experimental fitting. The specific method is as follows: Through experiments, data on energy dissipation pressure drop head Δp and flow velocity v under different conditions, namely chamfer, thickness, aperture and Reynolds number of wear-resistant parts at different positions are collected. The energy dissipation coefficient k is fitted using the experimental data. Based on the fitting results, a mathematical model is established to describe the calculation method of k and additional experimental data is used to verify the accuracy of the model.

9. The slurry pipeline energy dissipation system according to claim 8, characterized in that: The energy dissipation coefficient k is calculated using the following formula: C0, C1, C2, and C3 are correction coefficients obtained by fitting experimental data; ΔT is the temperature change, relative to the standard operating temperature; Δρ is the change in slurry density relative to the standard operating density; Δμ is the change in slurry dynamic viscosity relative to the standard operating viscosity; is the basic energy dissipation coefficient, which represents the relationship between the energy dissipation coefficient and the aperture ratio, thickness ratio, angle ratio and Reynolds number under standard operating conditions; They are temperature correction term, density correction term and viscosity correction term respectively.

10. An energy dissipation method for a slurry pipeline energy dissipation system, characterized in that: The steps include: Step 1: installing a plurality of slurry pipeline energy dissipation orifice plates on the energy dissipation main path (104) or the energy dissipation bypass path (103) of the slurry conveying pipeline; Step 2: According to the operating parameters of the slurry conveying system, including slurry density, flow rate, and concentration, select a slurry pipeline energy dissipation orifice plate with appropriate body parameters, including aperture ratio β, thickness-diameter ratio α, and angle-diameter ratio γ; Step 3: Control the flow direction of the slurry by means of an electric ball valve, so that the slurry passes through the energy dissipation main path (104) or the energy dissipation bypass path (103), and dissipates energy through the slurry pipeline energy dissipation orifice plate; Step 4: using a pressure transmitter to monitor the pressure change before and after energy dissipation, and using a concentration transmitter (91) and a flow transmitter (92) to monitor the concentration and flow of the slurry; Step 5: According to the monitoring data, adjust the position of the adjustable energy dissipation orifice plate or replace the energy dissipation orifice plate with different body parameters to adapt to different working conditions; Step 6: When necessary, flush the energy dissipation orifice plate through the flushing water pipeline (110) to prevent clogging; Step 7: When the system is being repaired or the energy dissipation orifice is replaced, the slurry flow direction is controlled by an electric knife gate valve to ensure safe operation.

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