Parallel desulfurization tower group

Abstract

The present application provides a parallel desulfurization tower group, comprising a plurality of pairs of the desulfurization tower; an inlet W-shaped water seal pipe and an outlet W-shaped water seal pipe are arranged between two pairs of the desulfurization tower; the inlet W-shaped water seal pipe and the outlet W-shaped water seal pipe each comprise two side pipe openings and a center pipe opening; the center pipe openings of the inlet W-shaped water seal pipes in the parallel desulfurization tower group are connected to a coal gas inlet header pipe, and the center pipe openings of the outlet W-shaped water seal pipes are connected to a coal gas outlet header pipe; a gas flow distribution device and three layers of packing are sequentially arranged in the desulfurization tower from bottom to top. The technical scheme of the present application can reduce the overall resistance of the tower group, solve the problems of gas flow segregation and uneven distribution of each single tower, and simultaneously realize the rapid on-off of inlet and outlet gas.

Description

Technical Field

[0001] This invention relates to the field of metallurgical and chemical equipment technology, and more particularly to a parallel desulfurization tower group. Background Technology

[0002] Dry desulfurization technology for coke oven gas is often used as a backup desulfurization device in the gas purification system of the coking industry. It involves filling the tower with activated carbon (coke) and iron oxide desulfurizing agent (packing), allowing the coke oven gas to flow through the bed and react with the desulfurizing agent (flow direction from bottom to top of the tower). Ultimately, it removes impurities such as H2S, tar, naphthalene, and HCN from the coke oven gas, thus purifying the coke oven gas. However, current packed dry desulfurization towers often use multi-stage series combined desulfurization technology. This design often results in increased overall airflow resistance and uneven load distribution (load reduction) among the desulfurization towers, which is not conducive to improving the desulfurization efficiency of each individual tower. On the other hand, because the gas often enters each individual tower directly from the side, the airflow in each individual tower is severely skewed, making it impossible to achieve uniform airflow distribution within the tower. This not only hinders the full contact and reaction between the airflow and the desulfurizing agent, but also easily creates blind spots during nitrogen purging and replacement of each individual tower during start-up and shutdown, resulting in safety hazards.

[0003] In summary, how to reduce the operating resistance of multi-stage desulfurization tower groups, improve the operating efficiency of desulfurization towers, and achieve uniform airflow distribution within the towers are problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a parallel desulfurization tower group. By employing W-type water seal pipes at the inlet and outlet of each individual tower, the rapid flow of air in each tower system is achieved. Simultaneously, the airflow distribution within the tower is uniform through the design of an airflow uniform distribution device and optimization of the packing material distribution.

[0005] The technical means employed in this invention are as follows:

[0006] A parallel desulfurization tower group includes a plurality of desulfurization towers arranged in pairs; the plurality of desulfurization towers are arranged symmetrically in two rows.

[0007] An inlet W-type water seal pipe and an outlet W-type water seal pipe are provided between the two desulfurization towers that are set in pairs;

[0008] Both the inlet W-type water seal pipe and the outlet W-type water seal pipe include two side ports and one central port; the central port of each inlet W-type water seal pipe in the parallel desulfurization tower group is connected to the gas inlet main pipe, and the central port of each outlet W-type water seal pipe is connected to the gas outlet main pipe.

[0009] In the two desulfurization towers that are set in pairs, the bottom gas inlets of the two desulfurization towers are respectively connected to the two side ports of the corresponding inlet W-type water seal pipe, and the top gas outlets are respectively connected to the two side ports of the corresponding outlet W-type water seal pipe.

[0010] The desulfurization tower is equipped with an airflow equalization device and three layers of packing from bottom to top. The second and third layers of packing from bottom to top are filled with desulfurizing agent, and the first layer of packing is filled with upper desulfurizing agent and lower metallurgical coke. The airflow equalization device is located at the center of the gas inlet at the bottom of the desulfurization tower and is used to ensure that the gas flow entering the desulfurization tower is evenly distributed.

[0011] Furthermore, when the parallel desulfurization tower group is in operation, the inlet W-type water seal pipe and the outlet W-type water seal pipe serve as gas flow channels; when the parallel desulfurization tower group is under maintenance, the inlet W-type water seal pipe and the outlet W-type water seal pipe through which water is introduced are used as water seals.

[0012] Furthermore, the desulfurization tower, the inlet W-type water seal pipe, and the outlet W-type water seal pipe are each equipped with a gas water seal device at their bottoms.

[0013] Furthermore, the inlet W-type water seal pipe and the outlet W-type water seal pipe are each equipped with an overflow pipe.

[0014] Furthermore, the airflow distribution device includes, from top to bottom, a conical wind cap and an air intake pipe arranged coaxially; the upper part of the air intake pipe extends into the internal air chamber of the conical wind cap, and the side wall is provided with an inclined air passage I extending outward from the air intake pipe along the circumferential direction; the upper wall of the air passage I is fixedly connected to the inner surface of the conical wind cap through an air passage partition II to form the air passage II.

[0015] Furthermore, the air intake pipe is connected to the internal air chamber of the conical wind cap, the air passage I is connected to the inside of the air intake pipe, and the air passage II is used to connect the internal air chamber of the conical wind cap with the outside of the airflow distribution device.

[0016] Furthermore, several airway baffles I are vertically arranged inside the airway I, and an exhaust port I is formed between two adjacent airway baffles I. The exhaust port I is used to connect the inside of the air intake pipe with the outside of the airflow equalization device. Several vertically arranged airway baffles II are arranged between the upper wall of the airway I and the inner surface of the conical wind cap. An exhaust port II is formed between two adjacent airway baffles I. The exhaust port II is used to connect the air chamber inside the conical wind cap with the outside of the airflow equalization device.

[0017] Furthermore, a reinforcing rib is fixedly installed between the lower wall of the air passage I and the outer surface of the air intake pipe.

[0018] Furthermore, the particle size of the lower layer of metallurgical coke in the first layer of the packing layer is distributed in a high-low-high gradient along the radial direction.

[0019] Furthermore, the lower layer of metallurgical coke in the first layer of the packing layer consists of metallurgical coke with a particle size of 40 mm, metallurgical coke with a particle size of 25 mm, and metallurgical coke with a particle size of 40 mm, arranged sequentially from the center outwards.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The parallel desulfurization tower group provided by the present invention adopts multi-tower parallel combination desulfurization technology, and the main gas pipe is distributed in the middle of each single tower and enters the bottom of the tower in two separate ways to contact and react with the bed material, thereby achieving gas purification. Compared with multiple desulfurization towers connected in series, it not only avoids the phenomenon of increased resistance of the entire tower group due to the mutual superposition of resistance of each single tower, but also improves the gas purification efficiency at the same time.

[0022] 2. The parallel desulfurization tower group provided by the present invention is equipped with W-type water seal pipes at the inlet and outlet of each desulfurization tower, which can quickly realize the on / off function of the main inlet and outlet pipes of each tower. At the same time, the airflow distribution at the bottom inlet of the tower is uniform by setting an airflow distribution device in each tower.

[0023] 3. The parallel desulfurization tower group provided by the present invention has metallurgical coke of a certain height laid at the bottom of the first layer of packing in each single tower, thereby achieving the initial adsorption and removal of impurities such as moisture and tar in the coal gas. Moreover, the metallurgical coke particle size is arranged in a gradient on the circumferential plane, which changes the distribution of material resistance in the bed at the bottom of the desulfurization tower. At the same time, this material distribution method is used in combination with the airflow uniform distribution device at the bottom of the tower to achieve uniform airflow distribution in each bed in the tower and avoid the occurrence of airflow blind spots or deflection in the tower.

[0024] Based on the above reasons, this invention can be widely promoted in the field of packed towers. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the parallel desulfurization tower group structure described in this invention.

[0027] Figure 2 for Figure 1 A schematic diagram of the airflow distribution device inside the desulfurization tower in the AA direction.

[0028] Figure 3 This is a schematic diagram of the airflow distribution device described in this invention.

[0029] Figure 4 for Figure 3 A cross-sectional view along the BB direction.

[0030] Figure 5 This is a schematic diagram of the airflow distribution device and the material distribution state within the first layer of packing in the desulfurization tower described in this invention.

[0031] In the diagram: 1. Inlet W-type water seal pipe; 2. Outlet W-type water seal pipe; 3. Desulfurization tower; 4. Gas inlet main pipe; 5. Gas outlet main pipe; 6. Airflow distribution device; 61. Conical wind cap; 62. Inlet pipe; 63. Gas duct I; 64. Gas duct II; 65. Gas duct baffle II; 66. Exhaust port II; 67. Gas duct baffle I; 68. Exhaust port I; 69. Reinforcing rib plate; 610. Internal gas chamber; 7. Packing layer; 71. Upper desulfurizing agent; 72. Lower metallurgical coke; 721. Metallurgical coke with a particle size grade of 40mm; 722. Metallurgical coke with a particle size grade of 25mm; 8. Support beam; 9. Discharge valve; 10. Gas water seal device; 11. Ash discharge hole; 12. Overflow pipe. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0037] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0038] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0039] Example 1

[0040] like Figure 1-5 As shown, the present invention provides a parallel desulfurization tower group, including a plurality of desulfurization towers 3 arranged in pairs; the plurality of desulfurization towers 3 are arranged symmetrically in two rows;

[0041] An inlet W-type water seal pipe 1 and an outlet W-type water seal pipe 2 are provided between the two desulfurization towers 3 that are set in pairs;

[0042] The inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2 each include two side pipe openings and one central pipe opening; the central pipe opening of each inlet W-type water seal pipe 1 in the parallel desulfurization tower group is connected to the gas inlet main pipe 4, and the central pipe opening of each outlet W-type water seal pipe 2 is connected to the gas outlet main pipe 5.

[0043] In the two desulfurization towers 3 that are set in pairs, the bottom gas inlets of the two desulfurization towers 3 are respectively connected to the two side ports of the corresponding inlet W-type water seal pipe 1, and the top gas outlets are respectively connected to the two side ports of the corresponding outlet W-type water seal pipe 2.

[0044] The desulfurization tower 3 is equipped with an airflow equalization device 6 and three layers of packing 7 arranged sequentially from bottom to top. The second and third layers of packing 7 are filled with desulfurizing agent, and the first layer of packing 7 is filled with upper desulfurizing agent 71 and lower metallurgical coke 72. By setting the lower layer of metallurgical coke, the initial adsorption and removal of impurities such as moisture and tar in the coal gas is achieved. The airflow equalization device 6 is located at the center of the gas inlet at the bottom of the desulfurization tower 3 and is used to make the coal gas flow into the desulfurization tower 3 evenly distributed.

[0045] Furthermore, when the parallel desulfurization tower group is in operation, the inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2 serve as gas flow channels; when the parallel desulfurization tower group is under maintenance, the inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2, through which water is introduced, are used as water seals.

[0046] Furthermore, the bottom of the inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2 are provided with inverted conical grooves for collecting and treating the water that settles in the gas flow.

[0047] Furthermore, the water seal height H of the inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2 is determined according to the design pressure of the gas inlet main pipe 4 or the gas outlet main pipe 5.

[0048] Furthermore, the bottom of the desulfurization tower 3 is conical and is provided with an ash discharge hole 11. The ash discharge hole 11 is provided with a discharge valve 9. When the desulfurization tower 3 is under maintenance, the ash discharge hole 11 and the discharge valve 9 are used to discharge the ash accumulated at the bottom of the desulfurization tower 3.

[0049] Furthermore, the desulfurization tower 3, the inlet W-type water seal pipe 1, and the outlet W-type water seal pipe 2 are respectively equipped with a gas water seal device 10 to prevent the accumulation of condensate at the bottom; the gas water seal device 10 can also be used to add water to the inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2 to play the role of water seal, thereby achieving isolation between the desulfurization tower 3.

[0050] Furthermore, the inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2 are respectively equipped with overflow pipes 12. During the water supply operation of the inlet W-type water seal pipe 1 and the outlet W-type water seal pipe 2 through the gas water seal device 10, the valve on the overflow pipe 12 is opened until water flows naturally from the pipe opening, and the water supply operation is stopped to avoid excessive water supply, which may cause water to flow from the water seal pipe into the interior of each single tower and cause an accident.

[0051] Furthermore, the airflow equalization device 6 includes, from top to bottom, a conical wind cap 61 and an air inlet pipe 62 arranged coaxially; the upper part of the air inlet pipe 62 extends into the internal air chamber of the conical wind cap 61, and the side wall is provided with an inclined air passage I 63 extending outward from the air inlet pipe 62 in the circumferential direction. The upper wall of the air passage I 63 is fixedly connected to the inner surface of the conical wind cap 61 through the air passage partition II 65 to form the air passage II 64. The airflow equalization device 6 can achieve uniform airflow distribution at the bottom gas inlet of the desulfurization tower 3. It is arranged at the center of the bottom of each desulfurization tower. During operation, the airflow enters the internal air chamber of the conical wind cap 61 from the air inlet pipe 62 at the bottom center of the airflow equalization device 6, and is evenly discharged through the air passage I 63 and the air passage II 64, so that the airflow is evenly dispersed upward in a circular pattern at the center of the bottom of the desulfurization tower 3.

[0052] Furthermore, the air intake pipe 62 is connected to the internal air chamber 610 of the conical wind cap 61, the air passage I 63 is connected to the inside of the air intake pipe 62, and the air passage II 64 is used to connect the internal air chamber of the conical wind cap 61 with the outside of the airflow distribution device 6.

[0053] Furthermore, several airway baffles I67 are vertically arranged inside the airway I63, and an exhaust port I68 is formed between two adjacent airway baffles I67. The exhaust port I68 is used to connect the inside of the air intake pipe 62 with the outside of the airflow equalization device 6. Several vertically arranged airway baffles II65 are arranged between the upper wall of the airway I63 and the inner surface of the conical wind cap 61. An exhaust port II66 is formed between two adjacent airway baffles I65. The exhaust port II66 is used to connect the air chamber inside the conical wind cap 61 with the outside of the airflow equalization device 6. By setting multiple exhaust ports in each airway layer, the airflow entering the airflow equalization device 6 can be further evenly dispersed and discharged outward.

[0054] Furthermore, a reinforcing rib plate 69 is fixedly installed between the lower wall of the air passage I 63 and the outer surface of the air intake pipe 62.

[0055] Furthermore, the edges of the upper and lower walls of the air passage I 63 are flush with the edge of the conical wind cap 61 in the vertical direction.

[0056] Furthermore, the air passage I 63 is provided with eight air passage baffles I 67 and eight exhaust ports I 68; eight air passage baffles II 65 and eight exhaust ports II 66 are provided between the upper wall of the air passage I 63 and the inner surface of the conical wind cap 61.

[0057] Furthermore, the apex angle of the conical wind cap 61 is 120°, and the conical design of the wind cap can prevent material from depositing on the upper part.

[0058] Furthermore, both the tower body of the desulfurization tower 3 and the airflow distribution device 6 are made of Q235-B steel.

[0059] Furthermore, the airflow distribution device 6 is fixedly installed inside the desulfurization tower 3 by a support beam 8 provided on the side.

[0060] Furthermore, such as Figure 5 As shown, the particle size of the lower layer of metallurgical coke 72 in the first layer of packing 7 is distributed in a high-low-high gradient along the radial direction. The particle size gradient arrangement of metallurgical coke designed by the present invention changes the material resistance distribution of the bed at the bottom of the desulfurization tower. At the same time, this material distribution method is used in combination with the airflow uniform distribution device 6 to achieve uniform airflow distribution in each bed in the tower and avoid airflow blind spots or deviations in the tower.

[0061] Furthermore, the lower layer of metallurgical coke 72 in the first layer of packing layer 7 consists of metallurgical coke 721 with a particle size of 40 mm, metallurgical coke 722 with a particle size of 25 mm, and metallurgical coke 721 with a particle size of 40 mm, arranged sequentially from the center outwards; as shown Figure 5 As shown, under normal circumstances, the airflow enters the bottom of the desulfurization tower 3 through the airflow equalization device 6 and flows out from around the conical wind cap 61 of the airflow equalization device 6. The airflow is weaker in the area opposite the packing at the top of the conical wind cap 61 and in the area near the tower wall. The gaps between the pores of the metallurgical coke with large particle size are large. In contrast, the packing part corresponding to other parts of the conical wind cap 61 is filled with metallurgical coke with small particle size, which can increase the resistance of the airflow entering the area and further change the upward distribution of the airflow, thus avoiding airflow segregation.

[0062] When the parallel desulfurization tower group provided by the present invention is working, the process flow of each pair of desulfurization towers is the same, including: gas inlet main pipe 4 → inlet W-type water seal pipe 1 → gas inlet at the bottom of the two desulfurization towers 3 → airflow distribution device 6 inside the two desulfurization towers 3 → first layer of packing (metallurgical coke, desulfurizing agent) → second layer of packing (desulfurizing agent) → third layer of packing (desulfurizing agent) → gas outlet at the top of the two desulfurization towers 3 → outlet W-type water seal pipe 2 → gas outlet main pipe 5.

[0063] The parallel desulfurization tower group provided by this invention consists of multiple desulfurization towers symmetrically arranged in two rows to form a parallel desulfurization tower group. The main gas pipe is distributed in the middle of each tower and enters the bottom of the tower simultaneously in two ways to contact and react with the bed material, ultimately achieving gas purification. Compared with multiple desulfurization towers connected in series, this not only avoids the phenomenon of increased resistance of the entire tower group due to the mutual superposition of resistance of each tower, but also simultaneously improves the gas purification efficiency.

[0064] Existing multi-stage series desulfurization tower groups suffer from high airflow resistance and uneven load distribution (load decreasing) among the stages, resulting in low desulfurization efficiency and airflow deviation and blind spots within the towers. The parallel desulfurization tower group provided by this invention optimizes the gas inlet method by changing it from side-entry to bottom-injection. Combined with the design of the airflow distribution device and the material distribution of the packing layer, it reduces airflow resistance and ensures uniform airflow distribution within the tower. This effectively avoids blind spots caused by airflow deviation, achieving comprehensive and uniform contact and reaction between coke oven gas and the desulfurizing agent within the tower, thus improving desulfurization tower efficiency and enabling efficient and economical operation. Furthermore, by forming a water seal through the W-shaped water seal pipe at the inlet or outlet, it ensures rapid on / off switching of gas in and out of each desulfurization tower. The parallel dual-tower switching is convenient, and each tower can be shut down independently without affecting the operation of other tower groups.

[0065] The desulfurization tower provided by this invention can also be used in other packed towers after certain modifications.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A parallel desulfurization tower group characterized by comprising: The desulfurization tower includes a plurality of pairs of the desulfurization tower; the pairs of the desulfurization tower are symmetrically arranged into two rows; Two of the pairs of the desulfurization tower are provided with an inlet W-shaped water seal pipe and an outlet W-shaped water seal pipe; The inlet W-shaped water seal pipe and the outlet W-shaped water seal pipe each include two side pipe openings and a center pipe opening; the center pipe openings of the inlet W-shaped water seal pipes in the parallel desulfurization tower group are connected to a coal gas inlet main pipe, and the center pipe openings of the outlet W-shaped water seal pipes are connected to a coal gas outlet main pipe; In the two pairs of the desulfurization tower, the tower bottom gas inlets of the two desulfurization towers are respectively connected to the two side pipe openings of the corresponding inlet W-shaped water seal pipe, and the tower top gas outlets are respectively connected to the two side pipe openings of the corresponding outlet W-shaped water seal pipe; The desulfurization tower is internally provided with, from bottom to top, a gas flow distribution device and three layers of packing layers; the second and third layers of the packing layers are respectively filled with desulfurization agents, and the first layer of the packing layer is filled with upper desulfurization agents and lower metallurgical coke; the gas flow distribution device is located at the center of the tower bottom gas inlet of the desulfurization tower and is used for uniformly distributing the coal gas flow entering the desulfurization tower; The gas flow distribution device includes, from top to bottom, a conical hood and a gas inlet pipe arranged coaxially; the upper part of the gas inlet pipe extends into the internal air chamber of the conical hood, and the side wall is circumferentially provided with inclined gas passages I extending to the outside of the gas inlet pipe; the upper wall surface of the gas passage I is fixedly connected to the inner side surface of the conical hood through a gas passage partition plate II and forms a gas passage II; the particle size of the lower metallurgical coke of the first layer of the packing layer is distributed in a high-low-high gradient along the radial direction.

2. The parallel desulfurization tower set according to claim 1, characterized in that, When the parallel desulfurization tower group is running, the inlet W-shaped water seal pipe and the outlet W-shaped water seal pipe serve as a coal gas flow passage; when the parallel desulfurization tower group is under maintenance, the inlet W-shaped water seal pipe and the outlet W-shaped water seal pipe filled with water are used as water seals.

3. The parallel desulfurization tower set according to claim 1, characterized in that, The desulfurization tower, the inlet W-shaped water seal pipe and the outlet W-shaped water seal pipe are respectively provided with a coal gas water seal device.

4. The parallel desulfurization tower set according to claim 1, characterized in that, The inlet W-shaped water seal pipe and the outlet W-shaped water seal pipe are respectively provided with an overflow pipe.

5. The parallel desulfurization tower set according to claim 1, characterized in that, The gas inlet pipe is in communication with the internal air chamber of the conical hood, the gas passage I is in communication with the inside of the gas inlet pipe, and the gas passage II is used for connecting the internal air chamber of the conical hood and the outside of the gas flow distribution device.

6. The parallel desulfurization tower set according to claim 5, characterized in that, A plurality of gas passage partition plates I are vertically arranged in the gas passage I, and an exhaust port I is formed between two adjacent gas passage partition plates I, which is used for connecting the inside of the gas inlet pipe and the outside of the gas flow distribution device; a plurality of vertical gas passage partition plates II are arranged between the upper wall surface of the gas passage I and the inner side surface of the conical hood, and an exhaust port II is formed between two adjacent gas passage partition plates I, which is used for connecting the internal air chamber of the conical hood and the outside of the gas flow distribution device.

7. The parallel desulfurization tower set according to claim 5, characterized in that, A reinforcing rib plate is fixedly installed between the lower wall surface of the gas passage I and the outer surface of the gas inlet pipe.

8. The parallel desulfurization tower set according to claim 1, characterized in that, The lower layer of the filler layer of the first layer is metallurgical coke with particle size grades of 40 mm, 25 mm and 40 mm from the center to the outside.

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