Multi-stage venturi exhaust pipe cyclone dust collector

Abstract

The utility model relates to a cyclone dust collector with a multistage venturi exhaust pipe, which belongs to the field of industrial gas purification and mainly comprises a barrel, a cone, a gas inlet pipe, the venturi exhaust pipe, a middle guide vane, a venturi gas collecting pipe and a dust collecting box. The side wall of the upper end of the barrel is connected with an air inlet pipe, one end of the air inlet pipe is an air inlet, the lower end of the barrel is connected with a cone, and a dust outlet in the lower end of the cone is connected with a dust collecting box. The venturi exhaust pipe is mounted in the center of the top of the barrel, an exhaust port in the upper end of the venturi exhaust pipe is located outside the barrel, and the lower end of the venturi exhaust pipe is inserted into the barrel, lower than the bottom of the inlet pipe and connected with the middle guide vane; the upper end of the Venturi gas collecting pipe is connected with the lower end of the middle guide vane to form a multi-stage separation device, so that the dust removal efficiency of the cyclone dust collector is improved, and meanwhile, the pressure loss is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of dust control and environmental protection, and specifically relates to a multi-stage Venturi exhaust pipe cyclone dust collector. Background Art

[0002] Cyclone dust collector is a type of mechanical dust removal device. Its dust removal mechanism is to make the dust-laden airflow rotate from top to bottom along the outer wall to form an outer vortex. The dust particles are separated from the airflow and captured on the wall by centrifugal force. The dust particles are then dropped into the ash hopper by gravity. The rotating airflow is blocked after reaching the bottom of the cone, and then rotates upward along the axis to form an inner vortex and enter the exhaust pipe for discharge. A small amount of gas moves radially to the center area and is discharged directly from the exhaust pipe. As an effective environmental protection equipment, cyclone dust collector is widely used in the field of solid particle dust removal due to its low price and simple structure. The optimization and innovation of its structure can further improve the dust removal efficiency and reduce the operating cost, so as to better meet the requirements of industrial production.

[0003] The traditional cyclone dust collector consists of an air inlet pipe, an exhaust pipe, a cylinder, a cone and an ash hopper. Under normal operating conditions, the centrifugal force acting on the particles is 5 to 2500 times that of gravity, so the efficiency of the cyclone dust collector is significantly higher than that of the gravity settling chamber. The cyclone dust collector is suitable for the removal of non-sticky and non-fibrous dust, mainly removing particles larger than 5 μm. Cyclone dust collectors are mainly divided into two types: single-stage and multi-stage. Single-stage cyclone dust collectors are usually used for particles with a diameter greater than 50 microns, while multi-stage cyclone dust collectors can handle particles less than 10 microns. The smaller the dust particle size captured by the cyclone dust collector, the higher the dust removal efficiency of the dust collector. Multi-stage separation gradually reduces the dust concentration of the airflow and avoids equipment wear. From the previous analysis and research on the operating mechanism and internal flow field movement of the cyclone dust collector, it can be concluded that the reasons for the limited dust removal efficiency of the cyclone dust collector include the following:

[0004] (1) Since there is no obvious dividing line between the outer vortex and the inner vortex in the flow field inside the cyclone dust collector, some dust-laden airflow does not move along the trajectory of first the outer vortex and then the inner vortex, but moves radially to the exhaust pipe and is directly discharged without being captured by the dust collector.

[0005] (2) The dust-laden airflow stays in the cyclone dust collector for too long. Since the dust particles in the inner vortex will not be captured by the dust collector, the dust removal efficiency cannot be improved by staying in this process.

[0006] (3) If the dust-laden airflow stays in the cyclone dust collector for too long, it will increase the resistance along the way and the pressure loss of the entire dust collector, which requires more power from the outside, resulting in increased energy consumption.

[0007] (4) The dust outlet of the cyclone dust collector is prone to blockage and dust accumulation during operation. The accumulated particles here will not enter the dust box, but will be carried back to the cylinder by the air flow and finally discharged from the exhaust pipe.

[0008] In order to solve the problem that the dust removal efficiency of the cyclone dust collector currently on the market is limited when in use, the utility model provides a multi-stage Venturi exhaust pipe cyclone dust collector. Summary of the invention

[0009] The utility model aims to provide a multi-stage Venturi exhaust pipe cyclone dust collector, which uses the Venturi air collector and the Venturi exhaust pipe together to achieve multi-stage acceleration of the airflow inside the dust collector, shortening the residence time of the dust-laden airflow in the cyclone dust collector, especially the residence time in the inner vortex. The Venturi air collector has a strong suction force, which can avoid the blockage and dust accumulation of particles in the dust outlet. The presence of the intermediate guide vane can effectively separate the outer vortex and the inner vortex, ensuring that the dust-laden airflow moves along the trajectory of the outer vortex first and then the inner vortex, extending its movement distance in the outer vortex, and achieving the purpose of improving the dust removal efficiency of the cyclone dust collector.

[0010] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a multi-stage Venturi exhaust pipe cyclone dust collector, mainly including a cylinder, a cone, an air inlet, an air inlet pipe, an exhaust port, a Venturi exhaust pipe, a dust exhaust port, an intermediate guide vane, a Venturi air collecting pipe and a dust collecting box.

[0011] The upper side wall of the cylinder is connected to the air inlet, and the air inlet pipe is arranged tangentially. One end of the air inlet is the air inlet, which is the entry channel for the dust-laden airflow. After the dust-laden airflow enters, it begins to rotate downward to form an external vortex. The particles move toward the inner surface of the cylinder due to the action of centrifugal force. Among them, particles with larger mass are thrown toward the wall due to their greater inertia. When the particles contact the wall, they lose their inertia and settle downward by their own gravity.

[0012] The lower end of the cylinder is connected to the cone, and the dust discharge port at the lower end of the cone is connected to the dust collection box. The Venturi exhaust pipe replaces the circular exhaust pipe and is installed at the center of the top of the cylinder. Its upper exhaust port is located outside the cylinder, and its lower end is inserted into the cylinder, lower than the bottom of the inlet pipe, and connected to the upper end of the middle guide vane. The lower end of the middle guide vane is connected to the upper end of the Venturi air collecting pipe, and the lower end is at a distance from the dust discharge port to avoid excessive suction capacity and the inhalation of fine particles into the inner vortex for discharge.

[0013] Compared with the existing technology, the beneficial effects of the utility model are:

[0014] (1) The combined use of the Venturi air collector and the Venturi exhaust pipe realizes multi-stage acceleration of the airflow inside the dust collector, shortening the residence time of the dust-laden airflow in the cyclone dust collector, especially the residence time in the inner vortex, thereby improving the particle removal efficiency, while reducing pressure loss and energy consumption.

[0015] (2) The middle guide vane can effectively separate the outer vortex and inner vortex of the flow field inside the dust collector, ensuring that the dust-laden airflow will move along the trajectory of the outer vortex first and then the inner vortex, extending the movement distance of the particles in the outer vortex, thereby increasing the contact time and contact area with the wall of the dust collector, and preventing the particles from moving radially to the exhaust pipe and then being discharged directly.

[0016] (3) The Venturi air collector has a strong suction force. When there are fine particles in the dust outlet, they can be cleared in time to avoid blockage and dust accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a two-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the Chinese Qiuli exhaust pipe;

[0020] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle guide vane;

[0021] Figure 5 yes Figure 1 Sectional view of AA in the middle;

[0022] In the figure, 1-exhaust pipe, 2-intake pipe, 3-cylinder, 4-intermediate guide vane, 5-Venturi collecting pipe, 6-cone, 7-dust box. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings.

[0024] Reference Figure 1 , a multi-stage Venturi exhaust pipe cyclone dust collector, comprising a Venturi exhaust pipe (1), an air inlet pipe (2), a cylinder (3), an intermediate guide vane (4), a Venturi air collecting pipe (5), a cone (6), and a dust collecting box (7).

[0025] like Figure 1-Figure 2 As shown, the cylinder (3) and the cone (6) are sealed and butted together to form the outer shell of the cyclone dust collector, the air inlet pipe (2) is connected to the upper end of the side wall of the cylinder (3), and the air inlet pipe is arranged in a tangential direction; the dust discharge port at the lower end of the cone (6) is connected to the dust collecting box (7).

[0026] The venturi exhaust pipe (1) is installed at the axial position of the cylinder, and the venturi exhaust pipe (1) is inserted to a position below the bottom of the intake pipe (2) and above the bottom of the cylinder (3), such as Figure 3 As shown, the Venturi exhaust pipe (1) is composed of a contraction section, a throat section, and a diffusion section. The lower part of the Venturi exhaust pipe (1) is provided with an intermediate guide vane (4);

[0027] The upper end of the intermediate guide vane (4) is connected to the lower end of the Venturi exhaust pipe (1), and the lower end of the intermediate guide vane (4) is connected to the upper end of the Venturi collecting pipe (5), forming a multi-stage device, such as Figure 5 As shown, the intermediate guide vanes (4) are composed of blades with the same structure and a number greater than 3 that are evenly distributed.

[0028] like Figure 1-Figure 5 As shown, the working principle of a multi-stage Venturi exhaust pipe cyclone dust collector:

[0029] When the material to be separated enters the cyclone dust collector through the air inlet pipe (2) of the cyclone dust collector, the air inlet pipe is arranged in a tangential direction. After entering the cyclone dust collector, the airflow begins to rotate downward. During the rotation of the airflow, the particles move toward the cylinder (3) and the inner wall of the dust collecting box (7) due to the action of centrifugal force. Among them, the particles with larger mass are thrown toward the wall due to their greater inertia. When the particles contact the wall, they lose their inertia and settle downward by their own gravity, and are discharged from the dust discharge port of the cone to the dust collecting box (7). The gas forms an outer vortex and moves downward until it reaches the conical section of the lower cone (6) of the cyclone dust collector. After entering the conical section, it continues to rotate and descend, but its rotation radius becomes smaller and smaller. According to the principle of conservation of momentum, the gas speed continues to increase. When it reaches a certain point in the conical section, it reverses from the bottom to the top from the middle of the cyclone dust collector and enters the Venturi collector (5) at the same rotation speed. The cross-sectional area of ​​the initial contraction section changes from coarse to fine, which accelerates the flow rate of the internal gas, reduces the pressure, and enhances the suction effect on the external airflow. The speed reaches the maximum at the throat. Then, the cross-sectional area of ​​the diffusion section changes from fine to coarse, and the flow rate decreases to a level close to the level just entering the inlet of the Venturi collector (5). Then, the airflow at the outlet is guided by the intermediate guide vane (4) and enters the Venturi exhaust pipe (1) for secondary acceleration. The process is similar to the gas flow in the Venturi collector (5), and finally discharged from the top of the Venturi exhaust pipe (1).

[0030] The multi-stage Venturi exhaust pipe cyclone dust collector provided by the utility model has the ability to purify particulate matter in the gas, especially the removal effect of fine particulate matter is remarkable. By removing particulate matter, it can effectively reduce the pollution of dust and particulate matter in the industrial production process to the environment, improve the quality of exhaust gas, and make it meet the atmospheric emission conditions stipulated by the state.

Claims

1. A multi-stage Venturi exhaust pipe cyclone dust collector, characterized in that: It includes a venturi exhaust pipe, an air inlet pipe, a barrel, an intermediate guide vane, a venturi collecting pipe, a cone and a dust collecting box; The cylinder and the cone are sealed and butted together to form the outer shell of the cyclone dust collector. The diameter of the cone decreases from top to bottom along the height direction. The lower end of the cone is connected to the dust collecting box. The air inlet pipe is connected to the upper end of the side wall of the cylinder, and the air inlet pipe is arranged along the tangential direction; The venturi exhaust pipe is installed at the axial position of the cylinder, the exhaust port at the upper end of the venturi exhaust pipe is located outside the cylinder, and the lower end is inserted to a position below the bottom of the air inlet pipe and above the bottom of the cylinder; The intermediate guide vane and the venturi collecting pipe are installed in the outer shell, the upper end of the intermediate guide vane is connected to the lower end of the venturi exhaust pipe, and the lower end of the intermediate guide vane is connected to the upper end of the venturi collecting pipe to form a multi-stage device.

2. A multi-stage Venturi exhaust pipe cyclone dust collector according to claim 1, characterized in that: The intermediate guide vane is composed of a number of blades with the same structure that are evenly distributed.

3. A multi-stage Venturi exhaust pipe cyclone dust collector according to claim 2, characterized in that: The number of blades of the intermediate guide vane is greater than three.

Images