A high-temperature and high-humidity resistant bag filter device

Abstract

The utility model discloses a kind of bag filter devices of high temperature and high humidity resistance, including cabinet, the cabinet includes upper cabinet and lower cabinet, pulse spray bag filter device is equipped on the upper cabinet, ash bucket and spiral ventilation duct are equipped in the lower cabinet, the spiral ventilation duct is fixedly wound in the outer end surface of the ash bucket, spiral ventilation duct one end fixedly connected air inlet pipe, the other end is connected by collecting barrel, elbow The upper cabinet of connection, the collecting barrel preliminarily collects the moisture and dust condensed into the spiral ventilation duct, to reduce the gas humidity and dust concentration of entering the upper cabinet. Spiral ventilation duct and pulse spray bag filter device are combined into the same equipment in the application, improve the probability of dust removal, while, also can cancel cyclone separator and washing tower used in industrial production, reduce the number of equipment use;While it can also greatly shorten process pipeline, improve space utilization, save equipment investment and installation cost.

Description

Technical Field

[0001] This utility model relates to the technical field of dust emission and collection, specifically to a bag filter device resistant to high temperature and high humidity. Background Technology

[0002] Tube bundle dryers are widely used in industries such as starch, feed, and chemicals. During the drying process, they generate large amounts of high-temperature, high-humidity, and dusty waste heat and exhaust gas. Direct emission of this waste gas not only wastes energy (carrying a large amount of recoverable heat energy) but also causes environmental pollution (dust, odor). Traditional treatment methods often employ a combination of "cyclone separation + washing tower," which has drawbacks such as large equipment footprint, complex processes, high energy consumption, and limited dust removal efficiency. It is particularly unsuitable for space-constrained projects, resulting in high industrial production costs. Patent number CN210251565U describes a high-temperature and high-humidity resistant filter bag. The filter bag is made of woven stainless steel fiber and combined with a frame to improve its high-temperature and high-humidity resistance. However, during filtration, if the water vapor content in the gas is too high, such as exceeding 25% humidity, condensation will be aggravated. For every 1% increase in moisture content, the dust removal resistance will increase by 15%, which will significantly reduce the service life of the filter bag for the high-temperature and high-humidity exhaust gas discharged from the dryer. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a bag filter device that is resistant to high temperature and high humidity.

[0004] According to the technical solution provided in the embodiments of this application, a high-temperature and high-humidity resistant bag filter device includes a housing, which includes an upper housing and a lower housing. The upper housing is equipped with a pulse jet bag filter device, and the lower housing is equipped with a dust hopper and a spiral ventilation duct. The spiral ventilation duct is fixedly wound around the outer end face of the dust hopper, and the dust hopper is connected to the upper housing to realize the collection of dust after dust removal by the pulse jet bag filter device. One end of the spiral ventilation duct is fixedly connected to the air inlet pipe, and the other end is connected to the upper housing through a bend. A collection bucket is provided at the connection between the spiral ventilation duct and the bend. The collection bucket initially collects the moisture and dust condensed in the high-temperature and high-humidity gas entering the spiral ventilation duct from the air inlet pipe, so as to reduce the humidity and dust concentration of the gas entering the upper housing.

[0005] Furthermore, the spiral ventilation duct is separated from the upper housing by a dust hopper to ensure dust collection.

[0006] Furthermore, the collection bin is equipped with a baffle. The air outlet of the spiral ventilation duct and the air inlet of the bend are connected to the end faces of the collection bin on both sides of the baffle. The baffle is designed to prevent condensed water droplets and clumps of dust from being carried into the upper chamber along the direction of gas flow.

[0007] Furthermore, the air inlet pipe is connected to the upper part of the spiral ventilation duct to ensure that the water vapor and dust in the exhaust gas can obtain centrifugal force.

[0008] Furthermore, the ash outlet of the ash hopper is fixed through the lower end face of the lower box to facilitate dust collection.

[0009] Furthermore, the pulse jet bag filter includes a filter bag frame, filter bag, air tank, electromagnetic pulse device, venturi tube, and controller; the upper part of the upper housing is provided with a clean gas outlet, located above the pulse jet bag filter, to achieve waste gas filtration.

[0010] In summary, the beneficial effects of this application are as follows: This application has the following advantages: 1. This application features a longitudinally placed spiral ventilation duct. Water vapor and dust in the high-temperature and high-humidity gas adhere to its inner wall due to centrifugal force, which can initially reduce the humidity and dust concentration in the high-temperature and high-humidity exhaust gas, thereby reducing the probability of condensation in the pulse jet bag filter device and extending the service life of the filter bag. 2. This application provides a collection bucket at the connection between the spiral ventilation duct and the bend to collect condensed water and dust, and the baffle installed inside the collection bucket can collect the condensed water vapor and dust a second time. 3. This application combines a spiral ventilation duct with a pulse jet bag filter device into the same equipment, which improves the dust removal probability and eliminates the need for cyclone separators and scrubbing towers used in industrial production, reducing the number of devices required; at the same time, it can also significantly shorten process pipelines, improve space utilization, and save on equipment investment and installation costs. Attached Figure Description

[0011] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a front sectional view of the overall device of this application; Figure 2 This is a schematic diagram of the connection structure between the ash hopper, spiral ventilation pipe, bend, and collection bucket in this application; Figure 3 This is a cross-sectional view of the collection bucket in this application.

[0012] Numbering in the diagram: Box-1; Upper Box-11; Clean Gas Outlet-111; Lower Box-12; Pulse Jet Bag Filter Device-2; Ash Hopper-3; Spiral Ventilation Duct-4; Air Inlet Pipe-5; Bend-6; Collection Bucket-7; Baffle-71. Detailed Implementation

[0013] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 As shown, the housing 1 includes an upper housing 11 and a lower housing 12. A pulse jet bag filter device 2 is provided on the upper housing 11. The pulse jet bag filter device 2 includes a filter bag frame, a filter bag, an air tank, an electromagnetic pulse device, a venturi tube, and a controller. The filter bag is fitted onto the filter bag frame. When the filter bag needs to be back-blown, the electromagnetic pulse device is activated by the controller to blow the air in the air tank into the filter bag frame through the venturi tube, so that the dust on the outer surface of the filter bag falls into the ash hopper 3 below it. like Figure 1 and Figure 2 As shown, the ash hopper 3 is placed inside the lower box 12, and the upper end face of the ash hopper 3 is fixedly connected to the inner end face of the box 1. A spiral ventilation duct 4 is fixedly provided on the outer end face of the ash hopper 3. The spiral ventilation duct 4 is placed longitudinally. The diameter of the upper end face of the spiral ventilation duct 4 is larger than the diameter of its lower end face. The upper part of the spiral ventilation duct 4 is connected to the air inlet pipe 5. The air inlet pipe 5 is fixedly passed through the box 1. The lower part of the spiral ventilation duct 4 is connected to the bend pipe 6 through the collection bucket 7. The other end of the bend pipe 6 is connected to the upper box 11. Depend on Figure 1 and Figure 2 It can be seen that after one end of the spiral ventilation duct 4 passes through the lower box 12, the other end passes through the lower part of the upper box 11 and enters the upper box 11. like Figure 1 As shown, the lower end face of the ash hopper 3 is located below the lower end face of the box 1, and the ash hopper 3 separates the upper box 11 from the spiral ventilation duct 4. like Figure 3 As shown, a vertically placed baffle 71 is provided inside the collection bucket 7, and through holes are provided on the collection bucket 7 on both sides of the baffle 71, which are respectively connected to the spiral ventilation duct 4 and the bend 6. In use, high-temperature and high-humidity exhaust gas (or the exhaust outlet of a dryer or equipment) is connected to the inlet pipe 5 through a pipe. The exhaust gas then enters the longitudinally placed spiral ventilation duct 4 through the inlet pipe 5. At this point, the water vapor and dust in the exhaust gas will experience centrifugal force, adhering to the inner wall of the spiral ventilation duct 4. When a significant amount of water vapor and dust adheres to the inner wall, the water vapor will condense into water droplets, and the dust will agglomerate into large particles. Under the continuous blowing of the exhaust gas, combined with the gravity of the water droplets and dust, they will be blown into the collection bucket 7. Due to the spiral ventilation duct... The air outlet of channel 4 faces the baffle 71. At this time, water droplets and dust will be intercepted and fall into the collection bucket 7. Lighter dust and uncondensed water vapor will bypass the baffle 71 and enter the upper box 11 through the bend pipe 6. At this time, the humidity and dust concentration in the gas will be greatly reduced. This gas is filtered by the filter bags on the pulse jet bag filter device 2. The dust will be trapped on the outer surface of the filter bags, and the clean gas will be discharged from the clean gas outlet 111. When the controller detects that the filtration efficiency of the filter bags is lower than the set value, the electromagnetic pulse device is activated to realize back-blowing, so that the dust on the surface of the filter bags falls into the ash hopper 3 for collection.

[0016] When the box 1 is rectangular, in order to ensure that the ash hopper 3 can separate the upper box 11 and the spiral ventilation duct 4, the ash hopper 3 is pyramidal, that is, the edge of the upper end face of the ash hopper 3 fits into the inner end face of the box 1; similarly, when the box 1 is cylindrical, the ash hopper 3 is conical.

[0017] To improve the condensation efficiency of water vapor in high-temperature and high-humidity exhaust gas, water inlets and outlets can be installed at the upper and lower ends of the lower chamber 12, respectively, so that the spiral ventilation duct 4 is immersed in water to reduce the exhaust gas temperature, thereby increasing the condensation efficiency of water vapor, further reducing the humidity of the exhaust gas, reducing the probability of condensation on the surface of the filter bag, and extending the service life of the filter bag.

[0018] The above description is merely a preferred embodiment of this application and an explanation of the technical principles and solutions employed. Furthermore, the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A high-temperature and high-humidity resistant bag filter device, comprising a housing (1), characterized in that: The housing (1) includes an upper housing (11) and a lower housing (12). The upper housing (11) is equipped with a pulse jet bag filter device (2). The lower housing (12) is equipped with a dust hopper (3) and a spiral ventilation duct (4). The spiral ventilation duct (4) is fixedly wound around the outer end face of the dust hopper (3). The dust hopper (3) is connected to the upper housing (11) to realize the dust collection after the pulse jet bag filter device (2) removes dust. One end of the spiral ventilation duct (4) is fixedly connected to the air inlet pipe (5), and the other end is connected to the upper housing (11) through a bend pipe (6). A collection bucket (7) is provided at the connection between the spiral ventilation duct (4) and the bend pipe (6). The collection bucket (7) initially collects the moisture and dust condensed in the high-temperature and high-humidity gas entering the spiral ventilation duct (4) from the air inlet pipe (5), so as to reduce the humidity and dust concentration of the gas entering the upper box (11).

2. The high-temperature and high-humidity resistant bag filter device according to claim 1, characterized in that: The spiral ventilation duct (4) is separated from the upper box (11) by the ash hopper (3).

3. The high-temperature and high-humidity resistant bag filter device according to claim 1, characterized in that: The collection bucket (7) is equipped with a baffle (71), and the air outlet of the spiral ventilation duct (4) and the air inlet of the bend (6) are connected to the end faces of the collection bucket (7) on both sides of the baffle (71).

4. The high-temperature and high-humidity resistant bag filter device according to claim 1, characterized in that: The air inlet pipe (5) is connected to the upper part of the spiral ventilation pipe (4).

5. The high-temperature and high-humidity resistant bag filter device according to claim 1, characterized in that: The ash outlet of the ash hopper (3) is fixedly passed through the lower end face of the lower box (12).

6. The high-temperature and high-humidity resistant bag filter device according to claim 1, characterized in that: The pulse jet bag filter device (2) includes a filter bag frame, a filter bag, an air tank, an electromagnetic pulse device, a venturi tube, and a controller.

7. The high-temperature and high-humidity resistant bag filter device according to claim 1, characterized in that: The upper part of the upper housing (11) is provided with a clean gas outlet (111), which is located above the pulse jet bag filter device (2).

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