CN2912767Y - Cloth bag dust remover - Google Patents

Abstract

A bag filter, which includes a box body with air inlets and outlets at both ends, a filter device composed of a flower plate and a filter bag is installed in the box body, and a clean air chamber is formed with the top surface of the box body, and the filter device Airflow channels are formed at the air intake side, below and in the middle; among them, a damping air distribution plate is arranged in the air inlet, and a partition is arranged in the vertical direction at the air inlet end of the box close to the filter bag, and the damping air distribution board and the Reflecting plates are arranged between the partitions, and a plurality of ventilation holes are evenly distributed on the vertical direction of the two sides and the middle part of the partitions on the damping air equalizing plate. The bag dust collector of the utility model has been tested, and the running resistance of the dust collector has been reduced from 1500-1800Pa to 1500-1800Pa, which is 300Pa lower, and also saves power consumption by 10-15%, and also prolongs the service life of the filter bag.

Description

Bag filter

technical field

The utility model relates to a dust remover, in particular to processing equipment widely used in dust-containing waste gas environments such as thermal power plants and cement plants.

Background technique

In combustion equipment such as thermal power plants and cement plants, electrostatic precipitators and bag-type pulse dust collectors are widely used in the treatment of dusty waste gas. Among them, the bag-type pulse dust collector includes a box and a filter installed in the box. bag, the injection system and pulse control system installed on the box, and the air regulating valve in the air outlet, etc. The slightly larger particles of high-temperature powder in the dust-laden exhaust gas entering the box directly fall into the ash hopper. Under the adjustment of the air regulating valve, the dust-laden exhaust gas enters the filter chamber covered with filter bags from the lower part of the box body, and passes through a large area. The filtering effect of the special filter bag keeps the dust on the outer surface of the filter bag, and the exhaust gas filtered by the filter bag is discharged from the upper part of the box through the air outlet. Due to the fast running speed and high resistance of the airflow inside the box (generally reaching 1500-1800Pa), the power consumption of the dust removal equipment is relatively high. And because of the high wind speed at the outlet of the damper, it is easy to cause secondary dust when the wind enters downward, which increases the dust concentration in the exhaust gas and obviously increases the operating load.

Utility model content

The technical problem to be solved by the utility model is to provide a bag filter that can effectively reduce running resistance and prevent secondary dust generation, thereby achieving the purpose of saving power consumption.

The bag filter of the utility model comprises a box body with air inlets and air outlets at both ends, and a filter device is installed in the box body. The device includes flower plates and several filter bags placed vertically. They are respectively fixedly connected to the evenly distributed through holes on the flower board, and the horizontally placed flower board is closed and connected to the upper part of the box body, and forms a clean air chamber with the top surface of the box body, and the air intake side, bottom and middle of the filter device form an air flow channel The air inlet includes a conical shell connected to one end of the box body. In the conical shell, a damping air distribution plate is arranged along the direction perpendicular to the axis of the air inlet. The periphery of the plate is closed and connected with the conical shell. , there are a number of air holes evenly distributed on the board surface; at the place where the air inlet end of the box is close to the filter bag, there is a partition along the vertical direction, the lower end of the partition is suspended, and the other sides are connected to the inner wall of the box Fixed, on the vertical direction of the two side edges and the middle part of the dividing plate, several air holes are also evenly distributed respectively.

The bag dust collector of the utility model, wherein between the damping air uniform plate and the partition, there are several blocks arranged in the vertical direction, fixedly connected with the shell at both ends, and placed in the horizontal direction within the range corresponding to the partition. A reflective plate, and the reflective plate has a downwardly inclined bent edge.

The bag dust collector of the utility model is provided with two air guide plates symmetrically in the vertical direction along the air flow channel in the middle of the partition plate.

The bag dust collector of the utility model is equipped with a damping air equalizing device and an air guide system at the air inlet, and the area through which the exhaust gas flows is increased by nearly 10 times, so that the air flow speed is reduced to less than 1 m/s. Due to the low air flow speed, And the distribution is uniform, the concentration of dusty exhaust gas is significantly reduced, and the generation of secondary dust is effectively suppressed, so that the dust concentration in the exhaust gas passing through the filter bag is greatly reduced, the filter resistance is reduced in the same pulse cycle, and the use of the filter bag is improved. life. After testing, the running resistance of the dust collector has been reduced from 1500-1800Pa to 1200-1500Pa, a reduction of 300Pa, which also saves power consumption by 10-15%, and prolongs the service life of the filter bag.

Description of drawings

Fig. 1 is a schematic diagram of the principle structure of the bag filter of the present invention (casing is a section);

Fig. 2 is the A-A sectional schematic diagram of Fig. 1;

FIG. 3 is a schematic cross-sectional view along line B-B of FIG. 1 .

Detailed ways

It can be seen from Figures 1 to 3 that the bag filter of the present invention includes a box body 3 with an air inlet 1 and an air outlet 2 at both ends, wherein the air inlet 1 includes a conical shell connected to one end of the box body 3 10. In the conical shell 10, a damping air equalizing plate 11 is provided along the direction perpendicular to the axis of the air inlet 1. The surrounding of the plate is closed and connected with the conical shell 10, and there are several uniformly distributed on the surface of the plate. The ventilation hole constitutes a first-level damping and uniform air system. After the dust-laden air passes through, the airflow speed drops below 1m/s. Then through the pre-sedimentation system composed of several downward-sloping curved reflectors 13 arranged in the vertical direction, and both ends are fixedly connected with the housing 10, and placed in the horizontal direction, the high-temperature dust with slightly larger particles in the dust-containing airflow Blocked by the reflector 13, it directly falls into the ash hopper 9 below. A filtering device is installed in the box body 3, which includes several vertically placed filter bags 4 and flower plates 5, as well as fixing brackets, and the upper end of each filter bag 4 is fixedly connected with through holes evenly distributed on the flower plates 5, respectively. , the flower plate 5 placed horizontally is closed and connected with the upper part of the box body 3, and forms a clean air chamber 6 with the top surface of the box body 3, that is, the middle and lower parts of the box body 3 communicate with the upper clean air chamber 6 through the filter bag 4. Airflow passages are formed at the intake side, bottom and middle of the filter device. Under the guidance of the partition 12, most of the airflow containing fine dust enters the clean air chamber 6 after being filtered by the filter bag 4 from bottom to top; the other part passes through the partition 12 The two-stage damping air equalization system formed by the air holes on both sides and the center, enters the clean air chamber 6 after being filtered by the filter bag 4, and finally discharges from the air outlet 2 through the air outlet channel 7 and the air outlet valve 8.

When the dust on the surface of the filter bag 4 reaches a certain thickness, the control system issues a dust removal command, and the compressed air passes through the blowing device 15 and the pulse valve 16 installed on the top of the box 3 to clean the filter bag 4 online. The filter bag 4 is a filter rod made of chemical fiber material. When the bag-ash hopper 9 is filled with dust, the dust will be discharged by the action of the vibrator installed thereon.

The utility model is implemented in a generating unit, and the environmental protection department tests that the dust concentration at the inlet of the dust collector is 46g/Nm ³ , and the concentration at the outlet drops to 27mg/Nm ³ , meeting the design requirements.

Claims (3)

1. A bag filter, comprising a box (3) with an air inlet (1) and an air outlet (2) at both ends, a filter device is installed in the box (3), and the device includes a flower plate (5) and several filter bags (4) placed vertically, the upper end of each filter bag (4) is fixedly connected with the evenly distributed through holes arranged on the flower plate (5), and the horizontally placed The flower plate (5) is closed and connected with the upper part of the box body (3), and forms a clean air chamber (6) with the top surface of the box body (3), and the air intake side, bottom and middle of the filter device form an air flow channel, It is characterized in that the air inlet (1) includes a conical casing (10) connected to one end of the box (3), and inside the conical casing (10), along the air inlet ( 1) A damping air equalizing plate (11) is provided in the direction perpendicular to each other, the periphery of the plate is closed and connected with the conical shell (10), and several ventilation holes are evenly distributed on the surface of the plate; The air inlet end of the casing (3) is adjacent to the place of the filter bag, and a partition (12) is arranged vertically, the lower end of the partition (12) is suspended, and all the other sides are connected with the casing ( 3) The inner wall is connected and fixed, and several ventilation holes are also evenly distributed in the vertical direction of the two sides and the middle part of the partition plate (12). 2. The bag filter according to claim 1, characterized in that between the damping air equalizing plate (11) and the partition (12), within the range corresponding to the partition (12) There are several reflecting plates (13) arranged in the vertical direction, fixedly connected to the housing (10) at both ends, and placed in the horizontal direction, and the reflecting plates (13) have downward-sloping bent edges . 3. The bag filter according to claim 1 or 2, characterized in that two wind deflectors ( 14).

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