CN203874604U - Air flow distribution device of lower air intake type dust collector - Google Patents

Abstract

The utility model discloses an air flow distribution device of a lower air intake type dust collector. The air flow distribution device of the lower air intake type dust collector comprises a box body and an ash bucket connected under the box body, wherein an air inlet is formed in the lower end of the box body; the air flow distribution device of the lower air intake type dust collector is characterized in that a perforated plate is arranged in the box body, guide plates which are parallel are arranged on the perforated plate, the length of the guide plate is in direct proportion to the distance from each guide plate to the air inlet, the position of the lower end of the longest guide plate is not lower than the lowest position of the air inlet, and the position of the lower end of the shortest guide plate is not higher than the highest position of the air inlet. According to the air flow distribution device, the flowing direction of air entering the dust collector is changed due to the distribution of the guide plates with the different lengths, each guide plate can intercept the air with the same flow amount sequentially, so that the treatment flow amounts of regions between each two guide plates is the same, eddy current and strong turbulence caused by the change of the airflow directions is reduced, airflows with changed directions are distributed uniformly by the perforated plate, and the dust collecting efficiency is improved.

Description

Airflow distribution device for down-inlet dust collector

technical field

The utility model relates to an air flow distribution device of a bottom-inlet type dust collector, which belongs to the technical field of dust removal equipment. the

technical background

The smoke and dust emitted by industries such as cement, steel, coal, and thermal power have largely contributed to the increasingly serious air pollution in my country. Therefore, the state has issued relevant mandatory provisions to limit the concentration of flue gas emissions from these polluting enterprises. Dust collectors are widely used as a device to effectively reduce the concentration of flue gas emissions. Among them, the down-inlet type dust collector is a widely used dust collector. the

Practical experience shows that the low dust removal efficiency caused by the disorder of air flow inside the dust collector is a major problem encountered in the promotion and application of dust collectors. It is an effective means to improve the efficiency of dust removal and promote the application of dust collectors by installing reasonable devices to make the air flow inside the dust collector evenly distributed. the

Contents of the invention

The purpose of this utility model is to solve the problem of uneven air flow in the existing down-inlet dust collector, and provide a kind of air-inlet that smoothly changes the flow direction and evenly distributes the lower flue gas in the dust collector, thereby improving the dust removal efficiency of the equipment. Type dust collector air distribution device. the

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

An airflow distribution device for a bottom-inlet dust collector, comprising a box body and an ash hopper connected below the box body, an air inlet is provided at the lower end of the box body, and it is characterized in that a perforated plate is arranged in the box body , the perforated plate is provided with deflectors arranged parallel to each other, the length of the deflector is proportional to the distance between the deflector and the air inlet, and the position of the lower end of the longest deflector is not lower than the The lowest position of the air inlet, the position of the lower end of the shortest deflector is not higher than the highest position of the air inlet. the

The distance between two adjacent deflectors is the same, and the lower ends of all the deflectors are located on the same oblique line. the

The thickness of the porous plate is 2-3 mm, and the opening rate is 45%-65%. the

The hole shape of the porous plate is circular, square or triangular. the

The box includes an upper box and a middle box, the air inlet and the perforated plate are arranged on the middle box, and the ash hopper is connected under the middle box. the

Compared with the prior art, the beneficial effects of the utility model are:

1. The utility model changes the flow direction of the gas entering the dust collector through the arrangement of deflectors with different lengths. Each deflector intercepts the same flow of gas in turn, so that the area between the two deflectors has the same flow rate. Reduce the eddy current and strong turbulent flow caused by the sudden change of the airflow direction; through the porous plate, the airflow after the direction change is evenly distributed, and the dust removal efficiency is improved. the

2. Through the numerical simulation of airflow organization, the utility model can promote the uniform distribution of airflow in the dust collector. The relative root mean square velocity of the cross-sectional airflow in the electrostatic precipitator area is 0.15, reaching the standard of "good" airflow uniformity in the specification. In the filter bag dust removal area, the deviation between the treatment flow rate of a single filter bag and the average treatment flow rate is not more than 3%. the

3. The device is simple, and the production process and installation method of the guide plate and the perforated plate are mature. the

Description of drawings

Fig. 1 is a structural schematic diagram of the air distribution device of the downdraft dust collector of the present invention. the

Fig. 2 is a schematic diagram of the structure of the porous plate of the present invention (taking circular holes as an example). the

In the figure: 1, upper box body, 2, middle box body, 3, air inlet pipe, 4, ash hopper, 5, perforated plate, 6, deflector plate, 7, perforated plate body, 8, perforated plate hole. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail

As shown in Figure 1, the airflow distribution device of the lower air inlet type dust collector of the present invention is composed of a dust collector box (which can be composed of an upper box body 1 and a middle box body 2), an ash hopper 4, and an air inlet connected to the air inlet. Air duct 3, guide plate 6 and perforated plate 5 are combined. The air flow enters the middle box 2 connected with it through the air inlet pipe 3, and first passes through the deflector 6 installed inside the middle box to make the flow direction of the air flow change from the horizontal direction to the vertical direction. The perforated plate 5 on the top of the deflector is in contact, and the air flow is evenly distributed. the

The deflector 6 starts from the nearest piece of the air inlet pipe 3, and the length increases successively. The position of the longest deflector lower end does not exceed the height of the lowest position of the air inlet pipe. A flow plate acts on a part of the airflow, reducing the eddy current and strong turbulence of the airflow. the

The quantity of deflector plate 6 is determined according to the length of middle box body 2. The longer the length of the middle box body 2, the more the number of deflectors 6, otherwise, the fewer the number of deflectors 6. the

The thickness of the porous plate 5 is 2 to 3mm, and the opening rate is 45% to 65%. The shape of the holes in the porous plate can be circular, square or other forms of holes. Outflow, the airflow is evenly distributed, which is obviously better than the dust collector without deflectors and only deflectors. the

Claims (5)

1. a lower wind inlet type deduster airflow distribution device, comprise casing and the ash bucket that is connected to casing below, lower end at described casing arranges air inlet, it is characterized in that: in described casing, be provided with a porous plate, on this porous plate, be provided with the deflector that is parallel to each other and arranges, the length of described deflector is directly proportional apart from the distance of air inlet to this deflector, the lower end position of long deflector is not less than the extreme lower position of described air inlet, and the lower end position of short deflector is not higher than the extreme higher position of described air inlet.

2. lower wind inlet type deduster airflow distribution device according to claim 1, it is characterized in that: the spacing of adjacent two deflectors is identical, and the lower end of all deflectors is positioned on same oblique line.

3. lower wind inlet type deduster airflow distribution device according to claim 1 and 2, it is characterized in that: described casing comprises upper box and middle casing, described air inlet and porous plate are arranged on described middle casing, connect described ash bucket below middle casing.

4. lower wind inlet type deduster airflow distribution device according to claim 3, is characterized in that: porous plate thickness is 2 ~ 3mm, percent opening is 45% ~ 65%.

5. lower wind inlet type deduster airflow distribution device according to claim 4, is characterized in that: the hole shape of described porous plate is circular, square or triangle.