Multistage spray absorption apparatus

Abstract

This utility model discloses a multi-stage spray absorption device, comprising: a treatment tower body, an air inlet located on the bottom side of the treatment tower body, an air outlet located on the top of the treatment tower body, and a spray absorption unit located inside the treatment tower body; wherein the liquid removal spray absorption unit includes at least two stages of spray absorption components spaced apart and arranged sequentially along the depth direction of the treatment tower body; each liquid removal spray absorption component includes a packing chamber and a spray chamber located above the packing chamber; a flow guiding component is also provided inside the liquid removal treatment tower body and located between the air inlet and the spray absorption unit; the liquid removal flow guiding component includes at least a plurality of flow guiding channels spaced apart and evenly arranged along the cross-sectional end face of the inner cavity of the treatment tower body; and the liquid removal treatment tower body is also equipped with a liquid removal drying structure for drying the droplets adhering to the surface of the gas after spray absorption treatment.

Description

Technical Field

[0001] This utility model relates to the field of chemical and environmental protection equipment technology, and in particular to a multi-stage spray absorption device. Background Technology

[0002] Industrial production typically generates wastewater and waste gas along with the products. Due to environmental protection requirements, high-concentration waste gas cannot be directly discharged into the atmosphere; it must be treated to reduce its concentration to meet emission standards before it can be released. Current technology commonly uses spray absorption towers to treat industrial waste gas. The waste gas is passed through the bottom of the tower, and absorbent liquid is sprayed into the top. The packing material expands the contact area between the gas and liquid phases, completing the absorption and treatment of the waste gas. The treated gas is then discharged from the top of the tower and enters the next stage of absorption treatment for further processing until it meets emission standards.

[0003] Among these methods, multi-stage spray absorption devices can optimize the treatment effect of industrial waste gas. For example, CN214287455U discloses a spray absorption tower and a multi-stage spray absorption device, and CN221619020U discloses an industrial waste gas spray absorption tower. These disclosed technologies utilize multi-stage spraying to achieve a large reaction area, comprehensive reaction, and good purification effect, avoiding material waste and potential air pollution. However, practical research and use have revealed that for multi-stage spray absorption devices like these, it is difficult to ensure uniform flow of waste gas within the absorption tower when it is directly introduced into the tower through the inlet pipe. The uniformity of contact between the absorbent liquid and the waste gas directly affects the absorption and treatment effect. Therefore, in order to improve the efficiency of waste gas absorption and treatment, it is necessary to increase the radiation area of ​​the absorbent liquid sprayed from the spray head. One possible technical means is to increase the number of spray heads to achieve the effect of increasing the radiation area. However, this increases the complexity of the structure, the cost of the equipment, and the difficulty of assembly and maintenance. Furthermore, the increased number of spray heads also increases the space occupied inside the tower, affecting the efficiency of waste gas flow.

[0004] In addition, while the exhaust gas is in full contact with the absorbent liquid, the treated exhaust gas will also carry the absorbent liquid. For some of the absorbent liquid, it is not acceptable to directly discharge it into the atmosphere along with the treated gas.

[0005] Therefore, to optimize the treatment effect of waste gas in the tower, it is also necessary to optimize the structure of the multi-stage spray absorption device. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-stage spray absorption device to solve the technical problem of optimizing the treatment effect of waste gas.

[0007] The multi-stage spray absorption device of this utility model is implemented as follows:

[0008] A multi-stage spray absorption device includes: a treatment tower body, an air inlet located on the bottom side of the treatment tower body, an air outlet located on the top of the treatment tower body, and a spray absorption unit located inside the treatment tower body; wherein

[0009] The spray absorption unit includes at least two stages of spray absorption components spaced apart and arranged sequentially along the depth direction of the treatment tower; each spray absorption component includes a packing chamber and a spray chamber located above the packing chamber;

[0010] Inside the treatment tower, between the air inlet and the spray absorption unit, a flow guiding assembly is also provided; the flow guiding assembly includes at least a plurality of flow guiding channels spaced apart and evenly arranged along the cross-sectional end face of the inner cavity of the treatment tower; and

[0011] The treatment tower is also equipped with a liquid removal and drying structure for drying the droplets adhering to the surface of the gas after spray absorption treatment.

[0012] In an optional embodiment of this invention, each spray chamber is further provided with a spray pipe for connecting multiple nozzles; and

[0013] Each of the nozzles includes a connecting pipe connected to the liquid spraying line and a nozzle connected to the connecting pipe;

[0014] The nozzle includes multiple injection channels respectively connected to a connecting pipe; each injection channel has a nozzle orifice formed at its end; and

[0015] The inner diameter of each nozzle increases sequentially from the inside out.

[0016] In an optional embodiment of this invention, each of the injection channels is arranged obliquely along the length of the nozzle.

[0017] In an optional embodiment of this utility model, the flow guiding assembly includes a connector with a conical cavity, a sealing plate with a plurality of through holes evenly arranged and mating with the small inner diameter end of the connector, an open opening formed at the large inner diameter end of the connector, and a plurality of diversion pipes that mate one-to-one with the plurality of through holes; wherein

[0018] Multiple splitter pipes are located at the end of the connector facing the air inlet;

[0019] Each of the aforementioned branch pipes is connected to a through hole to form a flow channel.

[0020] In an optional embodiment of this invention, the outer wall of the large inner diameter end of the connector is adapted to fit against the inner wall of the processing tower.

[0021] In an optional embodiment of this utility model, the processing tower body is provided with a bracket for supporting the connecting parts;

[0022] The bracket includes an annular support plate for supporting the small inner diameter end of the connector, and an annular connecting plate that is bent and connected to the outer edge of the annular support plate.

[0023] The annular connecting plate is used to fix it to the inner wall of the processing tower.

[0024] In an optional embodiment of this utility model, the liquid removal and drying structure is a drying mesh plate located inside the treatment tower body between the gas outlet and the spray absorption component adjacent to the gas outlet in the spray absorption unit.

[0025] In an optional embodiment of this utility model, the liquid removal and drying structure is a gas liquid removal component located on the outside of the treatment tower and connected to the gas outlet.

[0026] The gas removal assembly includes a removal chamber filled with desiccant, a gas inlet located on the bottom side wall of the removal chamber and connected to the gas outlet via a gas pipe, and a gas outlet located at the top of the removal chamber.

[0027] In an optional embodiment of this utility model, a bottom end cover is detachably connected to the bottom of the liquid removal tank; and

[0028] The liquid removal tank has a cylindrical hollow cavity;

[0029] The bottom end cap is provided with propeller blades extending along the depth direction of the hollow cavity on its end face facing the hollow cavity;

[0030] The propeller blade includes a central column and a spiral blade disposed on the outer wall of the central column; the outer edge of the spiral blade is in contact with the cavity wall of the hollow cavity, and a desiccant is filled between the outer wall of the connecting column and the cavity wall of the hollow cavity.

[0031] In an optional embodiment of this utility model, each of the packing chambers is provided with a packing layer;

[0032] The packing layer includes a perforated plate and packing balls, and the perforated plate is fastened to the inner wall of the processing tower body using fasteners.

[0033] By adopting the above technical solution, this utility model has the following beneficial effects: The multi-stage spray absorption device of this utility model, through the set flow guiding component, allows the waste gas to enter the treatment tower body through the air inlet on the bottom side of the treatment tower body. After being guided by the flow guiding component, it can achieve more uniform contact with the sprayed absorbent liquid when passing through at least two stages of spray absorption components, thereby improving the uniformity and efficiency of waste gas treatment. Furthermore, the designed liquid removal and drying structure can be used to dry the droplets adhering to the surface of the gas after spray absorption treatment, thus meeting the gas emission requirements. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the multi-stage spray absorption device according to Embodiment 1 of this utility model;

[0035] Figure 2 This is a schematic diagram of the nozzle structure of the multi-stage spray absorption device of this utility model;

[0036] Figure 3 This is a schematic diagram of the nozzle of the multi-stage spray absorption device of this utility model;

[0037] Figure 4 This is a schematic diagram of the structure of the multi-stage spray absorption device in Embodiment 2 of this utility model;

[0038] Figure 5 This is a schematic diagram of the gas removal component of the multi-stage spray absorption device according to Embodiment 2 of this utility model;

[0039] Figure 6 This is a schematic diagram of the flow guiding component of the multi-stage spray absorption device in Embodiment 3 of this utility model.

[0040] In the diagram: 1. Treatment tower body; 11. Air inlet; 12. Air outlet; 2. Nozzle; 2. Connecting pipe; 23. Spray channel; 24. Nozzle; 25. Nozzle; 26. Packing layer; 3. Liquid removal box; 4. Gas inlet; 41. Gas outlet; 42. Bottom cover; 43. Central column; 44. Spiral blade; 45. Plug; 46. Desiccant; 47. Connecting piece; 51. Sealing plate; 52. Through hole; 53. Diverter pipe; 54. Annular support plate; 61. Annular connecting plate; 62. Limiting ring; 63. Gas pipe; 7. Liquid spraying pipeline; 8. Drying mesh plate; 9. Detailed Implementation

[0041] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Example

[0042] Please see Figures 1 to 3As shown, this embodiment provides a multi-stage spray absorption device, including: a treatment tower 1, an air inlet 11 located on the bottom side of the treatment tower 1, an air outlet 12 located on the top of the treatment tower 1, and a spray absorption unit located inside the treatment tower 1.

[0043] Specifically, firstly, the spray absorption unit includes at least two stages of spray absorption components spaced apart and arranged sequentially along the depth direction of the treatment tower 1; each spray absorption component includes a packing chamber and a spray chamber located above the packing chamber; each spray chamber has multiple nozzles 2 arranged spaced apart along the cross-sectional end face of the spray chamber. Each packing chamber is provided with a packing layer 3; the packing layer 3 can be any mature means in the prior art, and this embodiment does not make any improvement in this regard. Generally, the packing layer 3 includes a perforated plate and packing balls, and the perforated plate is installed on the inner wall of the treatment tower 1 using fasteners such as, but not limited to, screws. Depending on the actual use, the number of stages of the spray absorption components included in this spray absorption unit can be adapted, and this embodiment does not make an absolute limitation on this.

[0044] Based on the above structure, and more specifically, each spray chamber is further provided with a spray pipe 8 for connecting multiple nozzles 2; and each nozzle 2 includes a connecting pipe 23 connected to the spray pipe 8, and a nozzle 26 connected to the connecting pipe 23. It should be noted that, in order to ensure that the multiple nozzles 2 in each spray chamber can be arranged as evenly as possible, it is understood that, from the perspective of the cross-section of the spray chamber of the treatment tower 1, the spray pipe 8 is arranged in a crisscross pattern to accommodate the spraying needs of the multiple nozzles 2.

[0045] Furthermore, referring to the accompanying drawings, in one optional embodiment, the nozzle 26 used in this embodiment includes multiple injection channels 24 respectively connected to the connecting pipe 23; each injection channel 24 forms a nozzle 25 at the end of the nozzle 26; and the inner diameter of each nozzle 25 increases sequentially from the inside to the outside. Through the ingenious design of the nozzle 25, since the pressure is highest in the middle of the nozzle 26, the area of ​​the nozzle 25 in the middle is the smallest. This balances the injection stroke and injection area of ​​the nozzle 25 on the entire nozzle 26, maximizing the injection utilization rate. In addition, the inclined arrangement of the injection channels 24 increases the overall injection area, ensuring sufficient contact between the injected absorbent and the exhaust gas, further improving the treatment effect of the multi-stage spray absorption device on the exhaust gas.

[0046] Based on the above, in one optional implementation, each spray channel 24 is arranged obliquely along the length of the nozzle 26. This design allows the spray channels 24 of adjacent nozzles 26 to spray in an alternating manner, with complementary spraying, which improves the uniformity of spraying and thus improves the treatment effect on exhaust gas.

[0047] Finally, it should be noted that the processing tower 1 in this embodiment is also equipped with a liquid removal and drying structure for drying the droplets adhering to the surface of the gas after spray absorption treatment. In this embodiment, the liquid removal and drying structure is a drying mesh plate 9 located inside the processing tower between the gas outlet 12 and the spray absorption component adjacent to the gas outlet 12 in the spray absorption unit. The drying mesh plate 9 can be any mesh plate in the prior art that can meet the requirements for drying the gas. It generally includes a mesh plate suitable for gas passage, and a desiccant is provided inside the mesh plate, so that the gas passing through the drying mesh plate 9 can have the droplets adhering to the gas surface absorbed by the desiccant, thereby ensuring that the gas finally discharged from the gas outlet 12 meets the emission requirements. Example

[0048] Please see Figure 4 and Figure 5 As shown, based on the multi-stage spray absorption device of Example 1, the multi-stage spray absorption device provided in this example uses a gas dehydration and drying structure located on the outside of the treatment tower 1 and connected to the gas outlet 12.

[0049] Referring to the accompanying drawings, in one optional embodiment, the gas dehydration assembly includes a dehydration chamber 4 filled with desiccant 47, a gas inlet 41 located on the bottom side wall of the dehydration chamber 4 and connected to the gas outlet 12 via a gas pipe 7, and a gas outlet 42 located at the top of the dehydration chamber 4. Optionally, a vacuum pump can be installed on the gas pipe connected to the gas outlet 42 to accelerate the gas flow through the dehydration chamber 4. Furthermore, a humidity sensor can be installed on this gas pipe to detect the humidity of the gas after passing through the dehydration chamber 4. If the humidity does not meet the requirements, it indicates that the desiccant 47 needs to be replaced.

[0050] More specifically, the bottom of the liquid removal tank 4 is detachably connected to a bottom end cover 43; and the liquid removal tank 4 has a cylindrical hollow cavity; the end face of the bottom end cover 43 facing the hollow cavity is provided with a propeller blade extending along the depth direction of the hollow cavity.

[0051] Based on the above structure, and referring to the accompanying drawings, in an optional embodiment, the propeller blade includes a central column 44 and a spiral blade 45 disposed on the outer wall of the central column 44; the outer edge of the spiral blade 45 is fitted against the cavity wall of the hollow cavity, and a desiccant 47 is filled between the outer wall of the connecting column and the cavity wall of the hollow cavity. Furthermore, it should be noted that the desiccant 47 needs to be replaced after a certain period of use to ensure the sustainability of the liquid removal effect of the liquid removal tank 4. Therefore, a plug 46 suitable for the entry and exit of the desiccant 47 is detachably disposed on the top of the liquid removal tank 4. This plug 46 may be connected to the liquid removal tank 4 by a threaded connection.

[0052] Based on the gas dehydration assembly of this embodiment, the airflow spirals upward along the spiral blade 45 inside the dehydration chamber 4 and comes into contact with the desiccant 47. The spiral flow of the airflow can prolong the contact time between the airflow and the desiccant 47, resulting in a better dehydration effect. When the desiccant 47 needs to be replaced, the bottom cover 43 is removed, causing the propeller blade to detach from the dehydration chamber 4. At this time, the desiccant 47 falls out of the dehydration chamber 4, and the propeller blade can also be removed from the dehydration chamber 4, making it easier to clean the desiccant 47 adhering to the propeller blade. The cleaning is more thorough. After cleaning, the propeller blade is put back into the dehydration chamber 4, and the plug 46 is opened to add new desiccant 47 into the dehydration chamber 4. This gas dehydration assembly facilitates the disassembly and replacement of the desiccant 47 and effectively improves the drying efficiency.

[0053] In summary, for the multi-stage spray absorption device of the embodiment, the waste gas enters the interior of the treatment tower 1 through the air inlet 11 on the bottom side of the treatment tower 1, and is absorbed and treated by at least two stages of spray absorption components. The treated gas is discharged into the gas dehydration component through the air outlet 12 at the top of the treatment tower 1 to remove liquid and dry the gas, so that it meets the gas emission standards. Example

[0054] Please see Figure 6 As shown, based on the multi-stage spray absorption device of Embodiment 1 or Embodiment 2, the multi-stage spray absorption device provided in this embodiment is further provided with a flow guiding component inside the treatment tower 1 and between the air inlet 11 and the spray absorption unit; generally speaking, the flow guiding component includes at least a plurality of flow guiding channels spaced apart and evenly arranged along the cross-sectional end face of the inner cavity of the treatment tower 1.

[0055] Referring to the accompanying drawings, one optional embodiment is described. In this embodiment, the flow guiding assembly includes a connector 51 with a conical cavity, a sealing plate 52 that mates with the small inner diameter end of the connector 51 and has a plurality of through holes 53 evenly arranged thereon, an open end formed on the large inner diameter end of the connector 51, and a plurality of diverter pipes 54 that mate one-to-one with the plurality of through holes 53; wherein the plurality of diverter pipes 54 are located on the side end of the connector 51 facing the air inlet 11; each of the diverter pipes 54 is connected to the through hole 53 to form a flow guiding channel.

[0056] Based on the above structure, it should also be noted that the outer wall of the large inner diameter end of the connector 51 is adapted to fit against the inner wall of the processing tower 1. The processing tower 1 is internally provided with a bracket for supporting the connector 51; the bracket includes an annular support plate 61 for supporting the small inner diameter end of the connector 51, and an annular connecting plate 62 bent and connected to the outer edge of the annular support plate 61; the annular connecting plate 62 is fixedly connected to the inner wall of the processing tower 1 by, for example, but not limited to, fasteners. It is understood that a limiting ring 63 is also provided on the inner wall of the processing tower 1 for abutting against the large inner diameter end of the connector 51. The limiting ring 63 can be connected to the inner wall of the processing tower 1 by fasteners, thus achieving reliable axial positioning and fixation of the connector 51 as a whole.

[0057] Based on the above, it should be noted that, in one optional implementation, the diameters of the multiple diversion pipes 54 are all the same; in another optional implementation, the diameter of each diversion pipe 54 gradually decreases from the center to the edge; in the actual spraying process, due to the limitation of the spraying angle, the spraying intensity of the atomized droplets corresponding to the spraying chamber often shows that the spraying intensity in the central area is greater and the spraying intensity in the edge area is smaller. The above structure can make the gas flow rate in the central area greater than that in the edge area.

[0058] In the multi-stage spray absorption device of this embodiment, the exhaust gas enters the interior of the treatment tower 1 through the air inlet 11 on the bottom side of the treatment tower 1 and is then guided by the flow guiding component, so that when it passes through at least two stages of spray absorption components, it can come into more uniform contact with the sprayed absorption liquid, thereby improving the uniformity and efficiency of exhaust gas treatment.

[0059] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0060] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0063] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0064] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A multi-stage spray absorption device, characterized in that, include: The treatment tower body, an air inlet located on the bottom side of the treatment tower body, an air outlet located on the top of the treatment tower body, and a spray absorption unit located inside the treatment tower body; wherein The spray absorption unit includes at least two stages of spray absorption components spaced apart and arranged sequentially along the depth direction of the treatment tower; each spray absorption component includes a packing chamber and a spray chamber located above the packing chamber; Inside the treatment tower, between the air inlet and the spray absorption unit, a flow guiding assembly is also provided; the flow guiding assembly includes at least a plurality of flow guiding channels spaced apart and evenly arranged along the cross-sectional end face of the inner cavity of the treatment tower; and The treatment tower is also equipped with a liquid removal and drying structure for drying the droplets adhering to the surface of the gas after spray absorption treatment.

2. The multi-stage spray absorption device according to claim 1, characterized in that, Each of the spray chambers is also provided with a spray pipe for connecting multiple nozzles; and Each of the nozzles includes a connecting pipe connected to the liquid spraying line and a nozzle connected to the connecting pipe; The nozzle includes multiple injection channels respectively connected to a connecting pipe; each injection channel has a nozzle orifice formed at its end; and The inner diameter of each nozzle increases sequentially from the inside out.

3. The multi-stage spray absorption device according to claim 2, characterized in that, Each of the injection channels is arranged at an angle along the length of the nozzle.

4. The multi-stage spray absorption device according to claim 1, characterized in that, The flow guiding assembly includes a connector with a conical cavity, a sealing plate that mates with the small inner diameter end of the connector and has a plurality of through holes evenly arranged thereon, an open opening formed at the large inner diameter end of the connector, and a plurality of diversion pipes that mate one-to-one with the plurality of through holes. in Multiple splitter pipes are located at the end of the connector facing the air inlet; Each of the aforementioned branch pipes is connected to a through hole to form a flow channel.

5. The multi-stage spray absorption device according to claim 4, characterized in that, The outer wall of the large inner diameter end of the connector is adapted to fit against the inner wall of the processing tower.

6. The multi-stage spray absorption device according to claim 4 or 5, characterized in that, The processing tower body is equipped with a bracket inside for supporting the connecting parts; The bracket includes an annular support plate for supporting the small inner diameter end of the connector, and an annular connecting plate that is bent and connected to the outer edge of the annular support plate. The annular connecting plate is used to fix it to the inner wall of the processing tower.

7. The multi-stage spray absorption device according to claim 1, characterized in that, The liquid removal and drying structure is a drying mesh plate located inside the treatment tower between the gas outlet and the spray absorption component adjacent to the gas outlet in the spray absorption unit.

8. The multi-stage spray absorption device according to claim 1, characterized in that, The liquid removal and drying structure is a gas liquid removal component located on the outside of the treatment tower and connected to the gas outlet. The gas removal assembly includes a removal chamber filled with desiccant, a gas inlet located on the bottom side wall of the removal chamber and connected to the gas outlet via a gas pipe, and a gas outlet located at the top of the removal chamber.

9. The multi-stage spray absorption device according to claim 8, characterized in that, The bottom of the liquid removal tank is detachably connected to a bottom cover; and The liquid removal tank has a cylindrical hollow cavity; The bottom end cap is provided with propeller blades extending along the depth direction of the hollow cavity on its end face facing the hollow cavity; The propeller blade includes a central column and a spiral blade disposed on the outer wall of the central column; the outer edge of the spiral blade is in contact with the cavity wall of the hollow cavity, and a desiccant is filled between the outer wall of the connecting column and the cavity wall of the hollow cavity.

10. The multi-stage spray absorption device according to claim 1, characterized in that, Each of the aforementioned packing chambers is provided with a packing layer; The packing layer includes a perforated plate and packing balls, and the perforated plate is fastened to the inner wall of the processing tower body using fasteners.

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