CN202762559U - Scroll cyclone dust collector - Google Patents

Abstract

The spiral cyclone dust collector mainly includes a volute case, an expansion chamber, an air inlet, and an exhaust cylinder. The upper end of a straight cylinder, the upper end of the straight cylinder is connected to the upper end of a cone cylinder, and the lower end of the cone cylinder is connected to the expansion chamber; an exhaust cylinder is installed in the center of the volute top cover; one side of the volute is connected to a pentagonal cross section air inlet. The volute of the utility model adopts a composite structure of a spiral and a volute, which combines the advantages of the two, and solves the inherent problem of the "upper ash ring" of the original flat-top dust collector. Compared with the traditional dust collection efficiency, the dust efficiency is increased by 3%-5%, and the pressure loss is reduced by about 33%, which reduces energy consumption and has certain economic and social benefits.

Description

Scroll Cyclone Dust Collector

technical field

The utility model relates to a dust collecting device, in particular to a high-efficiency spiral cyclone dust collector used in the cement industry.

Background technique

The cyclone dust collector uses the centrifugal force generated by the rotating airflow to separate the dust particles from the airflow, so as to purify the tail gas or meet the requirements of industrial process production. It is commonly used in the separation and dust collection of preheaters, raw material preparation and cement preparation in the cement industry. In addition, the gas from the grate cooler, kiln tail exhaust gas and other dusty gas heat sources is pretreated by the cyclone dust collector to the heat exchanger or supplied to the coal mill.

The working principle of the existing cyclone dust collector is illustrated in conjunction with Fig. 1. The cyclone shell is composed of a cylindrical barrel 20 and a conical barrel 30. The top of the cyclone shell is sealed by a top cover, and the center of the top cover has an exhaust pipe 40. The air inlet 10 is usually located on one side of the exhaust tube 40 and is tangent thereto.

The material enters the cylinder 20 from the air inlet 10 with the air flow, and the outer swirl 50 forming a semi-free vortex field spirals downward, and is forced to turn to the center at the bottom of the cone 30 to form an upwardly rotating inner swirl 60, and finally by Exhaust pipe 40 discharges. The materials entrained in the air flow are subjected to centrifugal action, and the coarse particles with larger particle diameters are thrown to the inner wall of the cylinder 20 and fall down into the ash bin below the cone barrel 30, while the fine particles with smaller particle diameters are discharged from the exhaust pipe 40 along with the airflow. discharge.

The air flow of the cyclone dust collector is a complex turbulent flow condition composed of tangential, radial and axial directions. The radial fractional velocity makes the flow process of the internal swirling air flow more chaotic during the rising process, forming a large number of vortices, and re-mixing the separated dust particles in the cylindrical part to form secondary dust. The axial fractional velocity and the radial fractional velocity make the traditional cyclone dust collector often form an upper ash ring and a lower ash ring during operation. The existence of the lower ash ring has a certain effect on the collection and separation of dust particles, while the existence of the upper ash ring The dust that has been collected and separated on the side wall of the cylindrical cylinder first moves upward along the cylinder wall, then moves inward along the top cover, and then moves downward along the outer wall of the inner cylinder. When a short circuit occurs, it is directly discharged through the exhaust pipe, reducing the Dust collection efficiency.

Therefore, it is very urgent to develop a new scroll cyclone dust collector that can improve dust removal efficiency, reduce pressure loss, and eliminate the "upper ash ring" problem of traditional cyclone dust collectors.

Utility model content

The purpose of the utility model is to provide a high-efficiency spiral cyclone dust collector used in the cement industry production line with high dust collection efficiency and low pressure loss, which can reduce energy loss and have greater economic benefits.

In order to achieve the above purpose, the spiral cyclone dust collector provided by the utility model mainly includes a shell, an expansion chamber, an air inlet and an exhaust cylinder, wherein:

The volute of the spiral cyclone dust collector is a spiral plus volute composite structure, the bottom of the volute is connected to the upper end of a straight cylinder, the upper end of the straight cylinder is connected to the upper end of a cone cylinder, and the lower end of the cone cylinder is connected to the expansion chamber; One side of the volute is connected with an air inlet; the center of the volute is installed with an exhaust pipe.

The vortex type cyclone dust collector is characterized in that the cross-sectional shape of the air inlet is pentagonal.

The beneficial effects of the utility model are:

1) The utility model adopts the composite structure of spiral and spiral type, combines the advantages of the two together, and solves the inherent problem of "upper ash ring" of the original flat-top dust collector, making the dust collection The efficiency is increased by 3%-5% compared with the traditional cyclone dust collector.

2) The new high-efficiency scroll cyclone dust collector reduces the turbulent flow caused by the swirling flow along the inner wall and the inlet airflow, thus reducing the wind resistance and pressure loss.

3) Compared with the traditional dust collector, the lower cone angle is 30°, which reduces the overall height dimension, saves the cost of civil engineering, and has greater economic benefits.

Description of drawings

Fig. 1 is the working principle diagram of the existing cyclone dust collector.

Fig. 2 is a schematic diagram of the three-dimensional structure of the utility model.

Fig. 3 is a structural schematic diagram of a volute and a straight cylinder.

Fig. 4 is a top view of the volute.

Fig. 5 is a schematic diagram of the structure of the air inlet.

Explanation of main signs and symbols in the attached drawings:

1-volute, 2-straight barrel, 3-cone barrel, 4-expansion chamber, 5-air inlet, 6-exhaust barrel.

Detailed ways

The utility model provides a spiral cyclone dust collector, which mainly includes a shell, an expansion chamber, an air inlet, and an exhaust cylinder, wherein:

The volute of the volute cyclone dust collector is a spiral plus volute composite structure, and one side of the volute is connected to an air inlet with a pentagonal cross-sectional shape;

The bottom of the volute is connected to the upper end of a straight cylinder, the upper end of the straight cylinder is connected to the upper end of a cone, the lower end of the cone is connected to the expansion chamber, and the center of the upper volute top cover of the housing is equipped with an exhaust cylinder.

Below in conjunction with embodiment and accompanying drawing, the utility model is further described:

Directions such as up, down, left, and right mentioned in this manual all refer to the directions shown in the illustrations.

Please refer to Fig. 2 and Fig. 3, the volute 1, the straight cylinder 2, the cone cylinder 3 and the expansion chamber 4 are sequentially connected from top to bottom in the high-efficiency scroll cyclone dust collector of the present invention. An exhaust tube 6 is installed in the middle of the volute 1 and the straight cylinder 2 , and an air inlet 5 is installed on the side of the volute 1 .

Please refer to Figure 4. The volute of the cyclone dust collector adopts a composite structure of spiral and volute. The outer edge of the volute is a logarithmic helix. The spiral structure is a downward spiral structure from the air inlet to the straight cylinder. This structure makes the airflow rotate inside the volute while ensuring the downward rotation, and at the same time makes the absolute refraction of the dust particles downward when they bounce back. The section of the inlet spiral channel decreases gradually, which increases the centrifugal force of the airflow rotation, accelerates the gas velocity in it, and reduces the dust particle settling time. Thereby improving the dust collection efficiency, and thus reducing the pressure loss.

The cone angle of the cyclone dust collector is appropriately increased, and the cone angle is 30°, which leads to a decrease in the wind speed in the cone compared with the traditional dust collector, and increases the residence time of the airflow in the cone, which is beneficial to small The settling of dust particles improves the dust collection efficiency, and at the same time reduces the height of the entire cyclone dust collector, saving the cost of civil engineering.

Please refer to Figure 5. The air inlet 5 of the cyclone dust collector is a pentagonal structure with a wide top and a narrow bottom. This structure reduces the turbulence caused by the airflow at the traditional rectangular air inlet and the possible inlet platform area. At the same time, the centrifugal force that is conducive to the generation is conducive to the rapid entry of gas into the cyclone, reducing the friction with the wall of the cyclone, thus reducing the pressure loss of the entire cyclone. As the pressure loss is smaller, the negative pressure that needs to be provided is relatively small, and the energy consumption of the system is also reduced.

The above technical features constitute the best embodiment of the present invention, which has strong adaptability and optimal implementation effect. In practical application, the technical features can be increased or decreased according to the situation to meet the needs of different situations.

The working process of the present utility model is:

The dust-laden gas enters the volute 1 of the cyclone dust collector through the air inlet 5, and under the action of the centrifugal force of the swirling flow, it passes through the lower spiral structure of the volute 1 to accelerate the rotation speed, and makes an outer wall along the inner wall of the straight cylinder 2 and the cone 3. Spiral rotation. When the gas reaches the cone 3, the cross-sectional area suddenly becomes smaller, and the rotation speed of the gas is accelerated to realize the separation of dust particles and gas. The dust particles are discharged into the expansion chamber 4 along the inner wall of the cone body 3, and the small dust particles that cannot be separated Under the action of inertia, it spirals internally with the airflow until it reaches the bottom of the exhaust tube and is discharged through the exhaust tube 6.

Claims (2)

1. The spiral cyclone dust collector mainly includes a volute, an expansion chamber, an air inlet and an exhaust cylinder, and is characterized in that: The volute of the spiral cyclone dust collector is a spiral plus volute composite structure, the bottom of the volute is connected to the upper end of a straight cylinder, the upper end of the straight cylinder is connected to the upper end of a cone cylinder, and the lower end of the cone cylinder is connected to the expansion chamber; One side of the volute is connected with an air inlet; The center of the volute is equipped with an exhaust pipe. 2. The spiral cyclone dust collector according to claim 1, characterized in that the cross-sectional shape of the air inlet is pentagonal.

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