CN109230549A - A kind of compound pneumatic conveying eddy flow bend pipe - Google Patents

Abstract

A composite pneumatic conveying swirl elbow comprises a pipe body for conveying fluid, the pipe body comprises three parts: an inlet straight pipe part, a curved pipe part and an outlet straight pipe part. The inlet straight pipe part includes an inlet straight pipe section, a gas-solid mixing inlet, a swirl gas inlet, a swirl gas mixing chamber and a swirl generation hole; the elbow part includes an elbow section, a first-level swirl generation pipe and a secondary swirl generating tube; the outlet straight pipe part includes an outlet straight pipe section and a gas-solid mixing outlet opened at its end. The invention can generate sufficient swirling gas, realize swirling conveying, effectively reduce the collision and friction between particles and the pipe wall, improve the quality of material conveying, effectively prolong the service life of the elbow, reduce the local pressure loss, and improve the pneumatic conveying system. work efficiency.

Description

A kind of compound pneumatic conveying eddy flow bend pipe

Technical field

The present invention relates to a kind of coal particles Pneumatic conveying pipeline, especially a kind of compound pneumatic conveying eddy flow bend pipe.

Background technique

Coal is the basic energy resource and important source material in China, and coal industry is related to economic life line of the country.As its people pass through The rapid development of Ji, China increasingly increase the demand of coal.Coal Transport link is occupied very big in coal mining cost Ratio, conveying equipment auxiliary facility is complicated under existing well, and safety accident takes place frequently.Pneumatic conveying utilizes certain pressure and speed The transportation technology of air-flow conveying granular material, is widely used to the fields such as petroleum, chemical industry and food processing, and cleaning, follows green Ring utilization rate is high.

However pipeline wear problem still inevitably occurs in coal process of pneumatic transmission at present, cause to convey efficiency Lower, coal dust largely overflows pollution environment, especially the most obvious with bend pipe.In addition, the pressure in air-transport system is damaged It loses comprising being mainly shown as local pressure loss in pipe bent position, particle stream flow velocity is big along stroke pressure loss and local pressure loss Small and flow direction sharply changes with bend pipe, generates velocity gradient, causes to form turbulent flow inside flow field, to aggravate between particle Collision and broken.

Summary of the invention

In order to overcome the above-mentioned deficiency of the prior art, the present invention provides a kind of coal particles Pneumatic conveying pipeline, can produce Raw sufficient rotational flow gas realizes the conveying of duration eddy flow, can effectively reduce the collision and friction between particle and tube wall, improves Material conveys quality, effectively extends bend pipe service life, while reducing local pressure loss, improves the work of air-transport system Efficiency.

The technical solution used to solve the technical problems of the present invention is that: including the tube body for trandfer fluid, the pipe Body include the entrance straight sections being sequentially connected, bent portion and outlet straight sections, the entrance straight sections include entrance straight pipe, Gas-solid mixing entrance, rotational flow gas entrance, rotational flow gas mixing chamber and eddy flow generate hole, and gas-solid mixing entrance is located at entrance straight tube The port of section, the periphery of entrance straight pipe is formed with a rotational flow gas mixing chamber, offers eddy flow on rotational flow gas mixing chamber Gas access is uniformly distributed circumferentially even number eddy flow and generates hole between rotational flow gas mixing chamber and entrance straight pipe, and each Eddy flow generates hole and entrance straight pipe tangentially and angle formed by axial direction is all the same；The bent portion includes bend loss, level-one Eddy flow generation pipe and second level eddy flow generate pipe, and level-one eddy flow generation pipe and the second level eddy flow generation quantity of pipe are equal, and the two number The summation of amount generates the consistent of hole with eddy flow, and level-one eddy flow generates pipe and second level eddy flow generates pipe parallel spaced-apart and is cast in bent portion Section outer wall surrounding generates hole with the eddy flow of entrance straight pipe and is interspersed；Each eddy flow generation pipe inside/outside diameter size is all the same, often One end that a eddy flow generates pipe is all connected to rotational flow gas mixing chamber, and the other end generates hole by eddy flow and is communicated in bend pipe section Portion, eddy flow generates hole and bend loss tangentially and angle formed by axial direction is all the same；Level-one eddy flow generates pipe end and is located at bend loss 1/3 at, second level eddy flow generate pipe end be located at the 2/3 of bend loss；The outlet straight sections include outlet straight pipe and It is opened in the gas-solid mixing outlet of its end.

Compared with prior art, a kind of coal particles Pneumatic conveying pipeline of the invention, it is compact-sized small in size, save installation Space, level-one eddy flow generates pipe and second level eddy flow generation length of tube length of tube more auxiliary than wing eddy flow is short, reduces rotational flow gas edge Stroke pressure loss；Generating hole by the eddy flow of entrance straight sections makes to convey particle and rise to revolve, and level-one eddy flow generates pipe and second level eddy flow It generates pipe and constantly supplements rotational flow gas for pipeline, avoid reverting to pure axis stream conveying again because of eddy flow underfed, to subtract Collision and friction between few particle and tube wall improve material and convey quality, effectively extend bend pipe service life, while reduction office Portion's pressure loss improves the working efficiency of air-transport system, has stronger innovative and wide applicability.

Detailed description of the invention

Present invention will be further explained below with reference to the attached drawings and examples.

Fig. 1 is the structural schematic diagram of one embodiment of the invention.

In figure, 1, tube body, 2, entrance straight pipe, 3, bend loss, 4, outlet straight pipe, 5, gas-solid mixing entrance, 6, eddy flow Gas access, 7, rotational flow gas mixing chamber, 8, eddy flow generation hole, 9, level-one eddy flow generation pipe, 10, second level eddy flow generation pipe, 11, Gas-solid mixing outlet.

Specific embodiment

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people Member's every other embodiment obtained without making creative work, belongs to protection scope of the present invention.

Fig. 1 shows the structural schematic diagram of a preferred embodiment of the invention, the compound pneumatic conveying of one of figure Eddy flow bend pipe, including the tube body 1 for trandfer fluid, the tube body 1 includes entrance straight sections, bent portion and outlet straight sections three Part.

The entrance straight sections include entrance straight pipe 2, gas-solid mixing entrance 5, rotational flow gas entrance 6, rotational flow gas Mixing chamber 7 and six eddy flows generate hole 8, and gas-solid mixing entrance 5 is located at the port of entrance straight pipe 2, the periphery of entrance straight pipe 2 It is formed with a rotational flow gas mixing chamber 7, rotational flow gas entrance 6, rotational flow gas mixing chamber are offered on rotational flow gas mixing chamber 7 It is uniformly distributed circumferentially six eddy flows between 7 and entrance straight pipe 2 and generates hole 8, and each eddy flow generates hole 8 and entrance straight pipe 2 is tangential and axial direction formed by angle it is all the same, after gas enters eddy flow mixing chamber 7 from eddy flow entrance 6, a part of air-flow passes through six A whirl hole 8 generates vortex gas-flow, and particle stream is made to have started rotation in straight sections.Rotational flow gas and axis gas body are added by air compressor machine It is first delivered to after pressure in air accumulator and carries out pressure stabilizing, then respectively enterd in pipeline, material is transported to the tube body 1 from previous segment pipe When, particle stream is not directly entered bent portion, but initially enters the straight sections of the tube body 1, and air-flow is when flowing through leading portion straight tube Axis stream flow field, after eddy flow generates hole 8, axial flow generates Swirling Flow under the disturbance mixing of vortex gas-flow, in system Particle has started rotation, is fed forward in the flow field of center with " rotation is floating " state, and a floor air-flow buffer area is formed around tube wall, The collision and friction between particle and tube wall are reduced, system energy consumption is reduced.

Preferred design as the present embodiment is that the rotational flow gas entrance 6 is connected with valve, controls eddy flow by valve Total gas flow rate, to adjust eddy flow flow accounting according to the type of particle, the speed of particle stream and pressure.

The bent portion includes that 3, three level-one eddy flows of bend loss generate pipes 9 and three second level eddy flows generate pipes 10, and one Grade eddy flow generates pipe 9 and second level eddy flow generates 10 parallel spaced-apart of pipe and is cast in bend pipe section outer wall surrounding, with entrance straight pipe 2 Six eddy flows generate hole 8 and are interspersed, and rotational flow gas entrance 6 avoids any one eddy flow of face from generating hole 8, otherwise most of gas Cognition is entered directly into inside conveyance conduit by the hole, and particle stream is caused to have biggish unstability；Each eddy flow generates Pipe inside/outside diameter size is all the same, and one end that each eddy flow generates pipe is connected to rotational flow gas mixing chamber 7, and the other end passes through eddy flow It generates hole 8 and is communicated to bent portion intersegmental part, eddy flow generates hole 8 and bend loss 3 tangentially and angle formed by axial direction is all the same；Level-one Eddy flow generates 9 end of pipe and is located at the 1/3 of bend loss 3, and second level eddy flow generates 10 end of pipe and is located at the 2/3 of bend loss 3.Air-flow After from eddy flow entrance 6 into eddy flow mixing chamber 7, the air-flow for not entering into whirl hole 8 respectively enters level-one eddy flow and generates pipe 9 and two Grade eddy flow generates pipe 10, is that particle stream supplements eddy flow flow in bent portion, guarantees that particle constantly plays rotation when conveying material.

The outlet straight sections include the gas-solid mixing outlet 11 for exporting straight pipe 4 and being opened in its end.Particle stream from After bent portion enters outlet straight sections, it is gradually recovered into pure axis stream conveying, next stage is entered by gas-solid mixing outlet 11 Conveyance conduit.

Rotational flow gas entrance 6, level-one eddy flow generate pipe 9 and the particular number of second level eddy flow generation pipe 10 is not limited to this reality The value in example is applied, can also be increased and decreased according to physical conditions such as bend pipe intensity, caliber and wearabilities.

The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is all according to According to technical spirit of the invention, any simple modification and same variation are made to above embodiments, each fall within guarantor of the invention Within the scope of shield.

Claims (3)

1. A coal particle pneumatic conveying pipeline, comprising a pipe body (1) for conveying fluid, and the pipe body (1) comprises an inlet straight pipe portion, a curved pipe portion and an outlet straight pipe portion that are connected in sequence, and it is characterized in that: Yes: The inlet straight pipe portion comprises an inlet straight pipe section (2), a gas-solid mixing inlet (5), a swirl gas inlet (6), a swirl gas mixing chamber (7) and a swirl generating hole (8), and the gas-solid The mixing inlet (5) is located at the port of the inlet straight pipe section (2), a swirling gas mixing chamber (7) is formed on the outer periphery of the inlet straight pipe section (2), and a swirling gas inlet is opened on the swirling gas mixing chamber (7). (6), between the swirl gas mixing chamber (7) and the inlet straight pipe section (2), an even number of swirl flow generation holes (8) are evenly distributed along the circumferential direction, and each swirl flow generation hole (8) is connected to the inlet straight pipe section. (2) The angles formed by the tangential and axial directions are the same; The elbow section includes a elbow section (3), a primary swirl generation pipe (9) and a secondary swirl generation pipe (10), a primary swirl generation pipe (9) and a secondary swirl generation pipe The number of (10) is equal, and the sum of the two numbers is consistent with that of the swirl flow generation hole (8). Around the outer wall of the section, the swirl generating holes (8) on the inlet straight pipe section (2) are alternately distributed; the inner and outer diameters of each swirl generating pipe are the same, and one end of each swirl generating pipe is connected to the swirl gas mixing chamber. (7), the other end is connected to the inside of the elbow section through the swirl flow generation hole (8), and the angle formed by the swirl flow generation hole (8) and the elbow section (3) in the tangential and axial directions are the same; one The end of the primary swirl generation pipe (9) is located at 1/3 of the elbow section (3), and the end of the secondary cyclone generation pipe (10) is located at 2/3 of the elbow section (3); The outlet straight pipe portion includes an outlet straight pipe section (4) and a gas-solid mixing outlet (11) opened at the end thereof. 2. A coal particle pneumatic conveying pipeline according to claim 1, characterized in that: the number of the swirl flow generating holes (8) is six, the first-level swirl flow generating pipe (9) and the second-level swirl flow There are three generating tubes (10). 3. A coal particle pneumatic conveying pipeline according to claim 1 or 2, characterized in that: the swirling gas inlet (6) is connected to a valve, and the total flow of swirling gas is controlled by the valve.