A filter bag mixed arrangement and method for reducing flow resistance of a baghouse

Abstract

This invention provides a filter bag mixing arrangement structure and method for reducing the flow resistance of a baghouse dust collector. The structure includes a shell, a tube sheet, filter bags, a clean air chamber, a pulse-jet cleaning device, and a dust collection hopper. The shell is hollow, forming a cavity, and a flue gas inlet is provided on the side wall of the shell. The tube sheet is fixed to the top of the shell, and the filter bags extending into the cavity of the shell are fixedly arranged below the tube sheet. The clean air chamber is located above the tube sheet, and a pulse-jet cleaning device corresponding to the filter bags is arranged inside the clean air chamber. A flue gas outlet is provided at the top of the clean air chamber. A dust collection hopper corresponding to the filter bags is located at the bottom of the shell. The tube sheet is divided into three zones along the flue gas flow direction: a high-temperature zone, a medium-temperature zone, and a low-temperature zone. One technical advantage of this invention is that it can effectively reduce the flow resistance of baghouse dust collectors in coal-fired power plants, improve dust removal efficiency, extend the service life of filter bags, and reduce energy consumption, thus providing good economic and social benefits.

Description

Technical Field

[0001] This invention belongs to the field of environmental protection technology, and specifically relates to a filter bag mixing arrangement structure and method for reducing the flow resistance of a bag filter dust collector. Background Technology

[0002] Thermal power plants utilize the heat generated by burning pulverized coal to heat water and form steam, which drives a turbine to rotate, thereby powering a generator to produce electricity. The combustion of pulverized coal inevitably produces toxic and harmful gases and a large amount of dust. For environmental protection and human health, thermal power plants often add dust collectors at the boiler tail end to capture the fine dust in the flue gas. Baghouse dust collectors, as a highly efficient dust removal device, are widely used in flue gas treatment in coal-fired power plants. However, during operation, existing baghouse dust collectors suffer from problems such as improper filter bag arrangement, leading to excessive flue gas flow resistance, affecting dust removal efficiency, increasing fan output and plant power consumption, and even shortening the filter bag lifespan.

[0003] Therefore, there is an urgent need for a filter bag mixing arrangement structure and method to reduce the flow resistance of baghouse dust collectors, so as to ensure dust removal efficiency and reduce energy consumption while reducing flow resistance. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a new technical solution for a filter bag mixing arrangement structure and method to reduce the flow resistance of a bag filter dust collector.

[0005] According to a first aspect of the present invention, a filter bag mixing arrangement structure for reducing the flow resistance of a baghouse dust collector is provided, comprising a shell, a tube sheet, filter bags, a clean air chamber, a pulse-jet cleaning device, and a dust collection hopper. The shell is hollow, forming a cavity. A flue gas inlet, which is flared, is provided on the side wall of the shell. The tube sheet is fixed to the top of the shell. The filter bags, extending into the cavity of the shell, are fixedly arranged below the tube sheet. The clean air chamber is located above the tube sheet, and a pulse-jet cleaning device corresponding to the filter bags is arranged inside the clean air chamber. A flue gas outlet is located at the top of the clean air chamber. A dust collection hopper, corresponding to the filter bags, is located at the bottom of the shell. Flue gas passes sequentially through the flue gas inlet, shell, filter bags, clean air chamber, and flue gas outlet for dust removal. High-pressure airflow is injected into the filter bags by the pulse-jet cleaning device, causing dust to fall off the filter bags and into the dust collection hopper. The tube sheet is divided into three zones along the flue gas flow direction: a high-temperature zone, a medium-temperature zone, and a low-temperature zone. Filter bags of different shapes and sizes are arranged in each zone. By dividing the tube sheet into three zones and arranging different filter bags, differentiated configurations can be made for the flue gas characteristics of different zones, effectively reducing overall flow resistance and improving dust removal efficiency.

[0006] Furthermore, the high-temperature zone is located near the flared end, and the filter bags within the high-temperature zone are elliptical filter bags arranged in a linear fashion. Since the high-temperature zone is close to the flue gas inlet, with high flue gas velocity and temperature, the elliptical filter bags reduce the frontal area, and the linear arrangement ensures smooth flow, effectively reducing flow resistance and filter bag wear in this area.

[0007] Furthermore, the filter bags located in the intermediate temperature zone are circular and arranged in a cross-row configuration. The intermediate temperature zone has a moderate flue gas velocity and is the main area for dust removal. The cross-row arrangement increases the turbulence and disturbance of the flue gas between the filter bags, improving dust collection efficiency while balancing filtration performance and resistance control.

[0008] Furthermore, the filter bags located in the low-temperature zone are circular and arranged in a parallel configuration. The flue gas velocity is low in the low-temperature zone, and the parallel arrangement facilitates uniform gas flow, preventing dust deposition and caking caused by excessively low local velocities.

[0009] Furthermore, the filter bags located in the high-temperature zone, medium-temperature zone, and low-temperature zone have the same total filtration area, which ensures a balanced filtration load in each zone, avoids a sudden increase in resistance in any zone, and maintains the long-term stable operation of the dust collector.

[0010] Furthermore, the height of the filter bag in the intermediate temperature zone is greater than that in the high temperature zone, but less than that in the low temperature zone. The high temperature zone uses shorter filter bags to reduce the heat load of the high-temperature flue gas, while the low temperature zone uses taller filter bags to fully utilize space and increase the filtration area. The height of the intermediate temperature zone falls between these two to match its flow rate characteristics.

[0011] Furthermore, the diameter of the filter bag in the medium temperature zone is larger than that in the high temperature zone and the low temperature zone, so that the medium temperature zone provides a larger single bag filtration area under the cross-layout arrangement, and the higher bag height achieves a balanced matching of the total filtration area of ​​each zone.

[0012] According to a second aspect of the present invention, a method for reducing the flow resistance of a bag filter dust collector by mixing and arranging filter bags, employing the above-mentioned filter bag mixing and arranging structure, includes the following steps: Step S1: Divide the perforated plate into three zones along the flue gas flow direction: a high-temperature zone, a medium-temperature zone, and a low-temperature zone. The high-temperature zone is located near the flare opening, the low-temperature zone is located away from the flare opening, and the medium-temperature zone is located between the high-temperature zone and the low-temperature zone.

[0013] Step S2: In the high-temperature zone, elliptical filter bags with a first preset height are arranged in a straight line; in the medium-temperature zone, circular filter bags with a second preset height are arranged in a staggered line; and in the low-temperature zone, circular filter bags with a third preset height are arranged in a straight line. The second preset height is greater than the first preset height and less than the third preset height.

[0014] Furthermore, the filter bags located in the high-temperature zone, medium-temperature zone, and low-temperature zone have the same total filtration area, ensuring a balanced filtration load in each zone.

[0015] One technical advantage of this invention is that: In this embodiment, filter bags of different shapes and sizes are arranged in high-temperature, medium-temperature and low-temperature zones by partitioning the tube sheet. Different configurations are made for the flue gas characteristics of different zones, which effectively reduces the flow resistance of flue gas and improves the dust removal efficiency.

[0016] Moreover, by arranging the filter bags in different zones, in addition to optimizing flue gas flow and reducing resistance, the flue gas can be cooled reasonably, protecting the filter bags from high-temperature damage, extending the service life of the filter bags, and reducing maintenance costs.

[0017] In addition, by reducing flow resistance, the output demand of induced draft fans can be reduced, energy consumption can be decreased, and the economic efficiency of coal-fired power plants can be improved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a tube sheet for a filter bag mixing arrangement structure to reduce flow resistance in a baghouse dust collector, according to an embodiment of the present invention.

[0019] In the diagram: 1. Trumpet mouth; 2. Ash collection hopper; 3. Shell; 4. Pulse jet cleaning device; 5. Flue gas outlet; 6. Clean air chamber; 7. Tube plate; 8. Filter bag; 9. High temperature zone; 10. Medium temperature zone; 11. Low temperature zone. Detailed Implementation

[0020] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0021] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Please see Figures 1-2 This invention provides a filter bag mixing arrangement structure to reduce the flow resistance of a bag filter dust collector, including a shell 3, a tube sheet 7, filter bags 8, a clean air chamber 6, a pulse jet cleaning device 4, and a dust collection hopper 2.

[0026] Specifically, the interior of the shell 3 is hollow, forming a cavity. A flue gas inlet, shaped like a bell, is located on the side wall of the shell 3. The bell-shaped inlet 1 has a gradually expanding structure, allowing the flue gas to gradually diffuse as it enters the cavity of the shell 3, reducing the inlet airflow velocity and achieving uniform gas distribution. A perforated plate 7 is fixed to the top of the shell 3. A filter bag 8, extending into the cavity of the shell 3, is fixed below the perforated plate 7. A clean air chamber 6 is located above the perforated plate 7, containing a pulse-jet cleaning device 4 corresponding to the filter bag 8. A flue gas outlet 5 is located at the top of the clean air chamber 6. A dust collection hopper 2, corresponding to the filter bag 8, is located at the bottom of the shell 3.

[0027] The flue gas dust removal process is as follows: Dust-laden flue gas enters the cavity of the housing 3 through the flared end 1. As it passes through the filter bag 8, the dust is trapped on the outer surface of the filter bag 8. The purified gas passes through the filter bag 8 and enters the clean gas chamber 6, and is finally discharged through the flue gas outlet 5. When the dust on the outer surface of the filter bag 8 accumulates to a certain thickness, a high-pressure airflow is sprayed onto the filter bag 8 by the jet cleaning device 4, causing the dust to fall off the filter bag 8 and into the dust collection hopper 2, thus completing the dust removal process.

[0028] In this embodiment, the tube sheet 7 is divided into three zones along the flue gas flow direction: a high-temperature zone 9, a medium-temperature zone 10, and a low-temperature zone 11. Each zone is equipped with filter bags 8 of different shapes and sizes. The high-temperature zone 9 is located near the bell-shaped opening 1, where the flue gas enters the housing 3 with the highest flow velocity and temperature. The low-temperature zone 11 is located away from the bell-shaped opening 1, where the flue gas flow velocity and temperature drop to their lowest levels after passing through the first two zones. The medium-temperature zone 10 is located between the high-temperature zone 9 and the low-temperature zone 11, where the flue gas temperature and flow velocity are moderate. By dividing the tube sheet 7 into three zones along the flue gas flow direction and arranging filter bags 8 of different shapes and sizes for the different flue gas temperature and flow velocity characteristics of each zone, zone optimization can be achieved, effectively reducing overall flow resistance and improving dust removal efficiency.

[0029] For example, the filter bags 8 in the high-temperature zone 9 are elliptical filter bags, arranged in a linear arrangement. Since the high-temperature zone 9 is close to the bell mouth 1, the flue gas velocity and temperature are high. The elliptical filter bags reduce the frontal area, lowering the impact resistance of the high-speed airflow on the filter bags 8, and simultaneously reducing the contact area between the high-temperature flue gas and the filter bags 8, preventing high-temperature damage to the filter bag material. The linear arrangement ensures smoother flue gas flow, further reducing flow resistance in this area and minimizing wear on the filter bags 8. Through this design, the high-temperature zone 9 can protect the filter bags 8 and reduce flow resistance under high-temperature and high-speed operating conditions.

[0030] Optionally, the filter bags 8 in the medium-temperature zone 10 are circular filter bags and are arranged in a forked manner. The flue gas velocity in the medium-temperature zone 10 is moderate, which is the main working area for dust removal. The circular filter bags arranged in a forked manner can increase the turbulence of the flue gas between the filter bags 8, so that the contact between the flue gas and the surface of the filter bags 8 is more sufficient, thereby increasing the probability of dust collection and enhancing the filtration efficiency, while taking into account both filtration performance and resistance control.

[0031] Optionally, the filter bags 8 in the low-temperature zone 11 are circular filter bags and are arranged in a parallel manner. The low-temperature zone 11 is far from the flared end 1, and the flue gas velocity is low, which can easily cause dust to clump on the surface of the filter bags 8. The parallel arrangement is conducive to the uniform passage of flue gas, reduces local dead zones, and avoids dust deposition and caking caused by excessively low local flow velocity.

[0032] Optionally, the total filtration area of ​​the filter bags 8 in the high-temperature zone 9, the medium-temperature zone 10, and the low-temperature zone 11 is the same, so that the filtration load of the three zones is kept balanced, avoiding a sudden increase in resistance due to insufficient filtration area in one zone, which is conducive to extending the service life of the filter bags 8 and maintaining the long-term stable operation of the dust collector.

[0033] Optionally, the height of the filter bag 8 in the medium-temperature zone 10 is greater than the height of the filter bag 8 in the high-temperature zone 9, but less than the height of the filter bag 8 in the low-temperature zone 11. In the high-temperature zone 9, due to the high flue gas velocity and temperature, a shorter filter bag 8 is used to reduce heat load and erosion wear; in the low-temperature zone 11, where the flue gas velocity is lowest, a taller filter bag 8 is used to fully utilize the space of the housing 3 and increase the filtration area; the height of the medium-temperature zone 10 is between the two, matching its moderate flow velocity characteristics.

[0034] Optionally, the diameter of the filter bag 8 in the intermediate temperature zone 10 is larger than the diameter of the filter bags 8 in the high temperature zone 9 and the low temperature zone 11. The intermediate temperature zone 10 uses filter bags 8 with a larger diameter, which can provide a larger single bag filtration area under a cross-stack arrangement. Combined with a suitable bag height, the total filtration area of ​​the intermediate temperature zone 10 is consistent with that of the high temperature zone 9 and the low temperature zone 11, achieving a balanced match of filtration capacity in each zone.

[0035] Example 2 Please see Figures 1-2 This invention also provides a method for reducing the flow resistance of a bag filter dust collector by arranging filter bags in a mixed manner, using the filter bag mixed arrangement structure described in Example 1, and including the following steps: Step S1: The tube sheet 7 is divided into three zones along the flue gas flow direction: a high-temperature zone 9, a medium-temperature zone 10, and a low-temperature zone 11. The high-temperature zone 9 is located near the bell mouth 1, the low-temperature zone 11 is located away from the bell mouth 1, and the medium-temperature zone 10 is located between the high-temperature zone 9 and the low-temperature zone 11. This zoning based on the distribution of flue gas temperature and velocity provides a basis for the subsequent differentiated arrangement of filter bags 8.

[0036] Step S2: Elliptical filter bags 8 with a first preset height are arranged in a straight line in the high-temperature zone 9; circular filter bags 8 with a second preset height are arranged in a cross-row arrangement in the medium-temperature zone 10; and circular filter bags 8 with a third preset height are arranged in a straight line in the low-temperature zone 11. The second preset height is greater than the first preset height but less than the third preset height. The use of elliptical filter bags in the high-temperature zone 9, arranged in a straight line, effectively reduces wind resistance and thermal damage; the use of circular filter bags in the medium-temperature zone 10, arranged in a cross-row arrangement, enhances turbulence and improves dust removal efficiency; and the use of tall circular filter bags in the low-temperature zone 11, arranged in a straight line, increases the filtration area and prevents dust caking.

[0037] In the above embodiments, filter bags 8 with different shapes, heights and arrangements are used in different areas to achieve differentiated configuration of zones, which significantly reduces the overall flow resistance of the bag filter while ensuring dust removal efficiency.

[0038] Optionally, the filter bags 8 located in the high temperature zone 9, the medium temperature zone 10, and the low temperature zone 11 have the same total filtration area to ensure a balanced filtration load in each zone and avoid excessive local resistance.

[0039] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector, characterized in that, Includes shell, tube sheet, filter bags, clean air chamber, pulse jet cleaning device and dust collection hopper; The shell is hollow, forming a cavity. A flue gas inlet, shaped like a bell, is located on the side wall of the shell. A tube sheet is fixed to the top of the shell, and a filter bag extending into the cavity is fixed below the tube sheet. A clean air chamber is located above the tube sheet, and a jet-blowing device corresponding to the filter bag is installed inside the clean air chamber. A flue gas outlet is located at the top of the clean air chamber. A dust collection hopper corresponding to the filter bag is located at the bottom of the shell. Flue gas passes sequentially through the flue gas inlet, shell, filter bag, clean air chamber, and flue gas outlet for dust removal. High-pressure airflow is injected into the filter bag by the jet-blowing device, causing dust to fall off the filter bag and into the dust collection hopper. The tube sheet is divided into three zones along the flue gas flow direction: a high-temperature zone, a medium-temperature zone, and a low-temperature zone. Each zone is equipped with filter bags of different shapes and sizes.

2. The filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector according to claim 1, characterized in that, The high-temperature zone is located near the flared end, and the filter bags within the high-temperature zone are elliptical filter bags arranged in a sequential manner.

3. The filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector according to claim 1, characterized in that, The filter bags located in the intermediate temperature zone are circular and arranged in a cross-row manner.

4. The filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector according to claim 1, characterized in that, The filter bags located in the low-temperature zone are circular and arranged in a sequential manner.

5. The filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector according to claim 1, characterized in that, The filter bags located in the high temperature zone, medium temperature zone, and low temperature zone have the same total filtration area.

6. The filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector according to claim 1, characterized in that, The height of the filter bag in the medium temperature zone is greater than the height of the filter bag in the high temperature zone, but less than the height of the filter bag in the medium temperature zone.

7. The filter bag mixing arrangement structure for reducing flow resistance in a baghouse dust collector according to claim 1, characterized in that, The diameter of the filter bag in the medium temperature zone is larger than the diameter of the filter bags in the high temperature zone and the low temperature zone.

8. A method for mixing and arranging filter bags to reduce flow resistance in a baghouse dust collector, characterized in that, The filter bag mixing arrangement structure as described in any one of claims 1 to 7 includes the following steps: Step S1: Divide the tube sheet into three zones along the flue gas flow direction: high temperature zone, medium temperature zone, and low temperature zone. Step S2: In the high-temperature zone, elliptical filter bags with a first preset height are arranged in a straight line; in the medium-temperature zone, circular filter bags with a first preset height are arranged in a staggered line; in the low-temperature zone, circular filter bags with a third preset height are arranged in a straight line; wherein, the second preset height is greater than the first preset height and less than the third preset height.

9. The method for mixing and arranging filter bags to reduce flow resistance in a baghouse dust collector according to claim 8, characterized in that, The filter bags located in the high temperature zone, medium temperature zone, and low temperature zone have the same total filtration area.

10. The method for mixing and arranging filter bags to reduce flow resistance in a baghouse dust collector according to claim 8, characterized in that, The high-temperature zone is located on the side closer to the flare opening, the low-temperature zone is located on the side farther from the flare opening, and the medium-temperature zone is located between the high-temperature zone and the low-temperature zone.

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