CN109230549B - A composite pneumatic conveying swirl elbow - 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 composite pneumatic conveying swirl elbow

technical field

The invention relates to a coal particle pneumatic conveying pipeline, in particular to a composite pneumatic conveying swirl elbow.

Background technique

Coal is my country's basic energy source and an important raw material, and the coal industry is related to the lifeline of the national economy. With the rapid development of the national economy, my country's demand for coal is increasing. Coal transportation accounts for a large proportion of coal mining costs. The existing underground transportation equipment and supporting facilities are complex, and safety accidents occur frequently. Pneumatic conveying is a transportation technology that uses air flow with a certain pressure and speed to transport granular materials. It has been widely used in petroleum, chemical and food processing fields. It is clean, green and has high recycling rate.

However, at present, the problem of pipeline wear is still inevitable in the process of coal pneumatic transportation, resulting in low transportation energy efficiency and a large amount of coal dust overflowing to pollute the environment, especially the elbow is the most obvious. In addition, the pressure loss in the pneumatic conveying system includes the pressure loss along the way and the local pressure loss, which is mainly manifested as the local pressure loss at the elbow. Turbulence is formed inside, which intensifies the collision and fragmentation between particles.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a coal particle pneumatic conveying pipeline, which can generate sufficient swirling gas, realize continuous swirling conveying, effectively reduce the collision and friction between the particles and the pipe wall, and improve the The quality of material conveying can effectively prolong the service life of the elbow, reduce the local pressure loss, and improve the working efficiency of the pneumatic conveying system.

The technical solution adopted by the present invention to solve the technical problem is: comprising a pipe body for conveying fluid, the pipe body comprises an inlet straight pipe part, a curved pipe part and an outlet straight pipe part which are connected in sequence, and the inlet straight pipe part is connected in sequence. The gas-solid mixing inlet includes an inlet straight pipe section, a gas-solid mixing inlet, a swirl gas inlet, a swirl gas mixing chamber and a swirl generating hole. The gas-solid mixing inlet is located at the port of the inlet straight pipe section, and a swirl gas mixture is formed on the outer circumference of the inlet straight pipe section. The swirl gas mixing chamber is provided with a swirl gas inlet, and an even number of swirl generation holes are evenly distributed along the circumferential direction between the swirl gas mixing chamber and the inlet straight pipe section, and each swirl generation hole is tangential to the inlet straight pipe section. The angle formed by the direction and the axial direction is the same; the elbow section includes a elbow section, a first-stage swirl generation pipe and a second-level swirl generation pipe, and a first-level swirl generation pipe and a second-level swirl generation pipe The numbers are equal, and the sum of the two numbers is consistent with that of the swirl generation holes. The primary swirl generation pipe and the secondary swirl generation pipe are cast in parallel and alternately around the outer wall of the elbow section, and the swirl generation of the inlet straight pipe section The holes are staggered; the inner and outer diameters of each swirl generating pipe are the same, one end of each swirl generating pipe is connected to the swirl gas mixing chamber, and the other end is connected to the inside of the elbow section through the swirl generating hole, and the swirl generating The tangential and axial angles formed by the hole and the elbow section are the same; the end of the primary swirl generation pipe is located at 1/3 of the elbow section, and the end of the secondary cyclone generation pipe is located at 2/3 of the elbow section The outlet straight pipe section includes an outlet straight pipe section and a gas-solid mixing outlet opened at its end.

Compared with the prior art, the coal particle pneumatic conveying pipeline of the present invention has a compact structure and small volume, saves installation space, and the lengths of the primary swirl generation pipe and the secondary swirl generation pipe are shorter than that of the fin type swirl auxiliary pipe. The pressure loss of the swirl gas along the way is reduced; the swirl generation hole in the inlet straight pipe part makes the conveyed particles swirl, and the first-level swirl generation pipe and the second-level swirl generation pipe continuously supplement the swirl gas to the pipeline to avoid the The swirl flow is insufficient and the pure axial flow is restored, thereby reducing the collision and friction between the particles and the pipe wall, improving the quality of material conveying, effectively prolonging the service life of the elbow, reducing the local pressure loss, and improving the work of the pneumatic conveying system. Efficiency, strong innovation and wide practicability.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure, 1. Pipe body, 2. Inlet straight pipe section, 3. Elbow pipe section, 4. Outlet straight pipe section, 5. Gas-solid mixing inlet, 6. Swirl gas inlet, 7. Swirl gas mixing chamber, 8. Swirl generation hole, 9, first-level swirl generation pipe, 10, second-level swirl generation pipe, 11, gas-solid mixing outlet.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 shows a schematic structural diagram of a preferred embodiment of the present invention. In the figure, a composite pneumatic conveying swirl elbow includes a pipe body 1 for conveying fluid, and the pipe body 1 includes an inlet straight pipe It consists of three parts: the pipe part, the elbow part and the outlet straight pipe part.

The inlet straight pipe portion includes an inlet straight pipe section 2, a gas-solid mixing inlet 5, a swirl gas inlet 6, a swirl gas mixing chamber 7 and six swirl generating holes 8, and the gas-solid mixing inlet 5 is located in 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 6 is opened on the swirling gas mixing chamber 7. Six swirl flow generation holes 8 are evenly distributed, and each swirl flow generation hole 8 has the same angle formed by the tangential and axial directions of the inlet straight pipe section 2. After the gas enters the swirl flow mixing chamber 7 from the swirl flow inlet 6, A part of the airflow passes through the six swirl holes 8 to generate a swirl airflow, so that the particle flow starts to swirl at the straight pipe portion. Both the swirl gas and the axial flow gas are pressurized by the air compressor and then transported to the gas storage tank for pressure stabilization, and then enter the pipeline respectively. When the material is transported from the previous pipeline to the pipe body 1, the particle flow does not directly enter the bend. The pipe part first enters the straight pipe part of the pipe body 1. When the airflow flows through the straight pipe in the front section, it is an axial flow field. In the flow field, the particles in the system begin to swirl, and are transported forward in the central flow field in a "floating" state, and a layer of airflow buffer zone is formed around the pipe wall to reduce the collision and friction between the particles and the pipe wall. Reduce system power consumption.

As a preferred design of this embodiment, the swirl gas inlet 6 is connected to a valve, and the total flow of swirl gas is controlled by the valve, so as to adjust the proportion of swirl flow according to the type of particles, the speed and pressure of particle flow.

The elbow section includes elbow sections 3, three primary swirl generation tubes 9 and three secondary swirl generation tubes 10. The primary swirl generation tubes 9 and the secondary swirl generation tubes 10 are cast in parallel and alternately. Around the outer wall of the elbow section, it is staggered with the six swirl generating holes 8 of the inlet straight pipe section 2. The swirl gas inlet 6 avoids facing any swirl generating hole 8, otherwise most of the gas will directly enter through this hole. To the inside of the conveying pipeline, the particle flow has greater instability; the inner and outer diameters of each swirl generation pipe are the same, and one end of each swirl generation pipe is connected to the swirl gas mixing chamber 7, and the other end passes through the swirl flow. The generation hole 8 is connected to the inside of the elbow section, and the angle formed by the swirl generation hole 8 and the elbow section 3 in the tangential and axial directions are the same; 3, the end of the secondary swirl generating pipe 10 is located at 2/3 of the elbow section 3. After the airflow enters the swirl mixing chamber 7 from the swirl inlet 6, the airflow that does not enter the swirl hole 8 enters the primary swirl generation pipe 9 and the secondary swirl generation pipe 10 respectively, and supplements the swirl flow for the particle flow at the elbow. The flow rate ensures that the particles continue to spin when the material is conveyed.

The outlet straight pipe portion includes an outlet straight pipe section 4 and a gas-solid mixing outlet 11 opened at its end. After the particle flow enters the straight pipe portion of the outlet from the elbow portion, it gradually returns to pure axial flow transportation, and enters the next-stage transportation pipeline through the gas-solid mixing outlet 11 .

The specific numbers of the swirl gas inlet 6, the first-stage swirl generation pipe 9 and the second-stage swirl generation pipe 10 are not limited to the values in this embodiment, and can also be determined according to actual conditions such as elbow strength, pipe diameter, and wear resistance. conditions are increased or decreased.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments according to the technical essence of the present invention shall fall into the scope of the present invention. within the scope of protection of the invention.

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), 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.

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