A bag filter for the top of a high-pressure coal conveying pulverized coal silo

Abstract

This utility model relates to a bag filter for the top of a high-pressure conveying pulverized coal silo, comprising a middle housing, a clean air chamber, a filtration device, a dust removal device, and a control device. The lower part of the middle housing has an air inlet for sealing connection with the exhaust port of the pulverized coal silo top cover. The clean air chamber is located at the top of the middle housing. The filtration device includes several filter bags disposed inside the middle housing. The dust removal device is divided into two parts, located inside and outside the clean air chamber respectively, for cleaning the filter bags. The control device is used to monitor the operating conditions of the air inlet and outlet. This utility model, through this design, enables a continuous cycle of filtration-dust removal-dust collection-filtration, maintaining unobstructed exhaust and ensuring that the dust concentration meets emission standards. This significantly improves the filter's filtration capacity and performance, and allows for real-time monitoring of operating conditions, thus achieving intelligent control.

Description

Technical Field

[0001] This utility model relates to the field of gas dust removal technology for pulverized coal silos, specifically to a bag filter for the top of a high-pressure conveying pulverized coal silo. Background Technology

[0002] The function of a baghouse dust collector on the top of a pulverized coal silo is to purify the gas discharged from the exhaust pipe so that it meets the discharge standards. In practical applications, the physical and chemical properties of the dust-laden gas in the high-pressure pulverized coal receiving silo, as well as the different physical forms of the gas transported by the system, directly affect the operation of the filter. These effects often lead to filter failure, resulting in frequent rupture of the explosion-proof valve diaphragm in the receiving silo, deformation of the silo causing weld cracks, or obstruction and blockage of the external gas supply for pulverized coal, forcing the silo to stop. This poses a safety hazard to the transport of flammable and explosive dust, and may even cause systemic damage.

[0003] Meanwhile, because the amount of flue gas that needs to be treated is small, dust collectors on the top of powder silos are often not given much attention. As a result, the existing dust collectors on the top of powder silos have poor filtration performance and low filtration capacity. Furthermore, there is a lack of necessary operational testing data. This backward concept and technology have led to a high failure rate of existing dust collectors on the top of powder silos, resulting in environmental pollution caused by conveying and receiving storage systems, and the failure factors are difficult to logically determine.

[0004] Therefore, it is particularly important to design a brand-new bag filter for the top of a high-pressure conveying pulverized coal silo in order to solve the above problems. Utility Model Content

[0005] This invention addresses the aforementioned problems by designing a high-pressure conveying pulverized coal silo top bag filter. Specifically designed for filtering the exhaust gas transported by high-pressure gas carrying pulverized coal to the receiving silo, it complements the process of ensuring clean gas is discharged in compliance with standards. In this solution, the high-pressure conveying pulverized coal silo top bag filter eliminates the need for an exhaust fan. Instead, it relies on the positive pressure of the flue gas within the silo to overcome the filter's own resistance for continuous filtration. As operating resistance increases, the filtration capacity decreases, prompting an automatic dust removal device to clean the filter. When operating resistance decreases, full filtration resumes, and the dust removed from the filter bags falls directly into the silo. This cycle of filtration-cleaning-dust collection and filtration continues continuously, ensuring unobstructed exhaust and compliant dust concentration emissions.

[0006] Specific utility model solution: This utility model provides a bag filter for the top of a high-pressure conveying pulverized coal silo, including a middle box, a clean air chamber, a filtering device, a dust removal device, and a control device. The lower part of the middle box has an air inlet for sealing connection with the exhaust port of the pulverized coal silo top cover. The upper part of the middle box has an air outlet. The clean air chamber is located at the top of the middle box, and the top of the clean air chamber has a manhole door for inspecting the filter bags for convenient bag replacement and maintenance. The filtering device includes several filter bags arranged in a matrix inside the middle box. The dust removal device is divided into two parts, located inside and outside the clean air chamber respectively, for cleaning the filter bags. The control device is used to detect the operating conditions of the air inlet and the air outlet and is interlocked with the external material conveying system to achieve intelligent control.

[0007] Furthermore, a perforated plate is sealed between the upper clean air chamber and the lower middle box. The perforated plate has several through holes, and several filter bags are installed corresponding to several through holes to achieve dust isolation and connection between the clean air chamber and the middle box.

[0008] Furthermore, the filter bag is configured as an elongated cylindrical shape, and the filtration device also includes a filter bag cage, on which several filter bags are arranged.

[0009] Furthermore: the dust removal device includes a steam drum and a pulse valve located inside the clean air chamber, and a blow pipe located in the middle box. The steam drum stores compressed gas, and the pulse valve is used to control the gas ejection. The blow pipe is positioned directly opposite the filter bag to remove the accumulated powder adhering to the filter bag.

[0010] Furthermore, the pulse valve and the blowpipe are configured with one valve in multiple rows, meaning that one pulse valve is connected to multiple blowpipes.

[0011] Furthermore, the dust removal device also includes an air inlet pipe and an air tank, wherein the air tank supplies compressed gas to the steam drum through the air inlet pipe.

[0012] Furthermore: a chimney is provided at the air outlet of the middle box, and a chimney cap is provided at the air outlet of the chimney.

[0013] The beneficial effects of this utility model after adopting the above structure are as follows:

[0014] 1. The middle chamber of this utility model is made of steel plate. Positive pressure flue gas in the powder silo enters the filter device evenly through the air inlet for filtration. The purified gas passes through the filter bag opening into the clean air chamber, exits from the clean air chamber outlet, and is then discharged through the chimney in compliance with standards. As the equipment pressure differential increases and reaches a set value, the control system activates the cleaning device to clean the filter bags. The dust removed from the filter bags falls directly into the powder silo, reducing the equipment operating pressure differential. This continuous cycle of filtration-cleaning-dust collection and filtration ensures unobstructed system exhaust and meets dust concentration emission standards, significantly improving the filter's filtration capacity and performance. Furthermore, it allows for real-time monitoring of operating conditions, enabling intelligent control.

[0015] 2. The dust removal device in this utility model is divided into two parts, located inside and outside the clean air chamber respectively. The pulse valve dust removal air source uses compressed gas, and the dust removal method uses constant pressure difference to automatically clean the filter bags, removing the accumulated powder adhering to the filter bags, reducing operating resistance, and enhancing dust removal capability and effect, which are necessary conditions for maintaining stable filter operation. The pulse valve of the dust removal device adopts a large-diameter submerged valve, with one valve and multiple rows, and low-pressure air source dust removal and other measures can prevent "over-cleaning" of the filter bags. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of the bag filter on the top of a high-pressure coal conveying pulverized coal silo provided by this utility model.

[0018] Explanation of icon numbers:

[0019] 1. Middle chamber; 2. Clean air chamber; 3. Filter bag; 4. Filter bag cage; 5. Dust removal device; 6. Control device; 7. Air inlet; 8. Chimney; 9. Air outlet.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] like Figure 1The illustrated high-pressure conveying pulverized coal silo top bag filter includes a middle housing 1, a clean air chamber 2, a filter device, a dust removal device 5, and a control device 6. The lower part of the middle housing 1 has an air inlet 7 for sealing connection with the exhaust port of the pulverized coal silo top cover. The clean air chamber 2 is located above the middle housing 1 and communicates with it. The top of the clean air chamber 2 has a manhole for inspecting the filter bags. For convenient bag replacement and maintenance, the top of the clean air chamber 2 is also provided with an air outlet 9. The filtration device includes several filter bags 3 located inside the middle box 1, arranged in a matrix. The dust removal device 5 is divided into two parts, located inside and outside the clean air chamber 2 respectively, for cleaning the filter bags 3. The control device 6 is used to detect the operating conditions of the air inlet 7 and the air outlet 9, and is interlocked with the external material conveying system to achieve intelligent control. In this utility model, the middle box 1 is made of steel plate. The positive pressure flue gas in the powder silo enters the filtration device evenly from the air inlet 7 for filtration. The purified gas passes through the filter and enters the clean air chamber 2 through the bag opening, and is discharged from the air outlet 9 of the clean air chamber 2, and then discharged from the chimney 8 in compliance with standards. As the equipment pressure difference increases and reaches the set value, the control system starts the cleaning device to clean the filter bags 3. The dust removed from the filter bags 3 falls directly into the powder silo, and the equipment operating pressure difference decreases. In this way, the system operates in a continuous cycle of filtration, dust removal, dust collection, and filtration, ensuring unobstructed exhaust and compliant dust concentration emissions. This significantly improves the filter's filtration capacity and performance, and enables real-time monitoring of operating conditions, thus achieving intelligent control.

[0025] like Figure 1 A perforated plate is sealed between the upper clean air chamber 2 and the lower middle box 1, as shown. The perforated plate has several through holes, and several filter bags 3 are installed corresponding to these through holes to achieve dust isolation and communication between the clean air chamber 2 and the middle box 1. In this invention, the clean air chamber 2 adopts a large box structure. By setting the perforated plate, the filter bags 3 can be effectively connected and the gas can fully contact the filter bags 3, thus improving the filtration performance of the device.

[0026] like Figure 1 The filter bag 3 shown is configured as an elongated cylindrical shape. The filtration device also includes a filter bag cage 4, on which several filter bags 3 are mounted. This design effectively ensures dust removal, and the dust adsorbed on the dust-facing surface of the filter bag 3 is easily peeled off and removed, maintaining operation at low resistance.

[0027] like Figure 1The dust removal device 5 shown includes a steam drum and a pulse valve located inside the clean air chamber 2, and a blowpipe located inside the middle housing 1. The steam drum stores compressed gas, and the pulse valve controls the gas ejection. The blowpipe is positioned directly opposite the filter bag 3 to remove accumulated dust adhering to the filter bag 3. This invention, through this design, achieves precise fluid control. With proper coordination with the control device 6, it enables intelligent cleaning of the filter bag 3 according to operating conditions, improving the automation level of the device.

[0028] like Figure 1 The pulse valve and the blowpipe shown are configured with one valve in multiple rows, meaning one pulse valve is connected to multiple blowpipes. The dust removal device 5 in this invention is divided into two parts, located inside and outside the clean air chamber 2 respectively. The pulse valve uses compressed gas as the dust removal air source, and the dust removal method uses a constant pressure difference to automatically clean the filter bags 3. Removing the accumulated powder adhering to the filter bags 3, reducing operating resistance, enhancing dust removal capability, and improving dust removal effect are necessary conditions for maintaining stable filter operation. The pulse valve of the dust removal device 5 is a large-diameter submerged valve, and the use of one valve in multiple rows and low-pressure air source dust removal measures can prevent "over-cleaning" of the filter bags 3.

[0029] like Figure 1 The dust removal device 5 shown also includes an air inlet pipe and an air tank, through which the air tank replenishes compressed gas to the steam drum. This design ensures timely replenishment of compressed gas to the steam drum, preventing sudden interruptions in the cleaning process and thus maintaining optimal cleaning results.

[0030] like Figure 1 A chimney 8 is installed at the air outlet 9 of the middle casing 1 shown, and a chimney cap is installed at the air outlet 9 of the chimney 8. This design allows for the effective removal of clean air, and the chimney cap provides wind and rain protection, thus improving the device's resilience.

[0031] The specific working process of this device is as follows: First, the dirty gas from the exhaust port of the pulverized coal silo enters the middle chamber 1 through the air inlet 7 and comes into full contact with the filter bag 3 in the filtration device. Then, the dirty gas is filtered by the filter bag 3 and enters the interior of the filter bag 3. It then enters the clean air chamber 2 at the top through the perforated plate with a sealed connection. At this time, the dirty gas has been filtered into clean gas by the filtration device. Then, the qualified clean gas is discharged through the air outlet 9 in the clean air chamber 2, thereby realizing the filtration and discharge of flue gas. As the equipment pressure difference increases and reaches the set value, the control device 6 starts the cleaning device 5 to clean the filter bag 3. Specifically, the pulse valve controls the blowpipe to blow out inert gas to blow the dust on the filter bag 3 into the powder silo. At this time, the equipment operating pressure difference decreases. In this way, the filtration-cleaning-dust-filtration cycle is repeated continuously, maintaining smooth exhaust of the system and ensuring that the dust concentration meets the emission standards, thereby significantly improving the filtration capacity and performance of the filter.

[0032] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A bag filter for the top of a high-pressure conveying pulverized coal silo, characterized in that, The system includes a middle housing (1), a clean air chamber (2), a filter device, a dust removal device (5), and a control device (6). The lower part of the middle housing (1) has an air inlet (7) for sealing connection with the exhaust port of the pulverized coal silo top cover. The clean air chamber (2) is located above the middle housing (1) and communicates with the middle housing (1). The top of the clean air chamber (2) is provided with a manhole door for inspecting filter bags for convenient bag replacement and maintenance. The top of the clean air chamber (2) is also provided with an air outlet. (9) The filtration device includes several filter bags (3) located inside the middle box (1). The filter bags (3) are arranged in a matrix. The dust removal device (5) is divided into two parts located inside and outside the clean air chamber (2) respectively, for cleaning the filter bags (3). The control device (6) is used to detect the operating conditions of the air inlet (7) and the air outlet (9) and is interlocked with the external material conveying system to achieve intelligent control.

2. The high pressure delivery pulverized coal storage silo roof bag filter as claimed in claim 1, wherein, A perforated plate is sealed between the upper clean air chamber (2) and the lower middle box (1). The perforated plate has several through holes, and several filter bags (3) are installed corresponding to several through holes to achieve dust isolation and communication between the clean air chamber (2) and the middle box (1).

3. The high pressure delivery pulverized coal storage silo roof bag filter as claimed in claim 1, wherein, The filter bag (3) is configured as an elongated cylindrical shape, and the filtration device also includes a filter bag cage (4), on which a plurality of the filter bags (3) are disposed.

4. The high pressure delivery pulverized coal storage silo roof bag filter of claim 1, wherein, The dust removal device (5) includes a steam drum and a pulse valve located inside the clean air chamber (2) and a blow pipe located in the middle box (1). The steam drum stores compressed gas, and the gas is sprayed out by controlling the pulse valve. The blow pipe is positioned directly opposite the filter bag (3) to remove the accumulated powder adhering to the filter bag (3).

5. The high pressure delivery pulverized coal storage silo roof bag filter as claimed in claim 4, wherein, The pulse valve and the blowpipe are configured with one valve in multiple rows, that is, one pulse valve is connected to multiple blowpipes.

6. The high pressure delivery pulverized coal storage silo roof bag filter as claimed in claim 4, wherein, The dust removal device (5) also includes an air inlet pipe and an air tank, wherein the air tank supplies compressed gas to the steam drum through the air inlet pipe.

7. The bag filter on the top of the high-pressure conveying pulverized coal silo as described in claim 1, characterized in that, A chimney (8) is provided at the air outlet (9) of the middle box (1), and a chimney cap is provided at the air outlet (9) of the chimney (8).

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