Housing device and flue gas desulfurization system

Abstract

The utility model belongs to the technical field of desulfurization equipment, and discloses a housing device and a flue gas desulfurization system. The housing device comprises a frame body, a covering part and a walking mechanism. The covering part covers the periphery of the frame body, the covering part and the frame body form a housing body, and at least one side of the housing body is provided with an opening. The walking mechanism is arranged at the bottom of the housing body, and the walking mechanism is configured to bear the housing body to walk so that the housing body can have a working position and a standby position. The housing body is driven by the walking mechanism to move between the working position and the standby position, and particularly, the standby position of the housing body structurally realizes complete space separation from the discharge port and a key material accumulation area below the discharge port; the core pain points that the fixed housing is difficult to clean and inconvenient to maintain and the shielding effect is influenced in the desulfurization gypsum treatment of the steel plant are directly solved, and the device has remarkable practical value and popularization prospect.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization equipment technology, and in particular to a casing device and a flue gas desulfurization system. Background Technology

[0002] In modern integrated steel enterprises (steel plants), key operations such as steelmaking, sintering, coking, and self-owned power plants generate large amounts of flue gas containing sulfur dioxide (SO2). To meet increasingly stringent environmental requirements, flue gas desulfurization (FGD) systems, especially wet flue gas desulfurization (WFGD) systems, have become essential environmental protection facilities for steel plants. Wet desulfurization processes commonly employ the limestone-gypsum method, with desulfurized gypsum as a byproduct. The desulfurization vacuum belt conveyor is a key piece of equipment in this process for dewatering the gypsum slurry, forming gypsum filter cake, and conveying and unloading it.

[0003] In the complex industrial environment of steel plants, the discharge port of desulfurization vacuum belt conveyors usually requires a cover. The current common practice is to use a fixed cover structure. Its main purpose is to contain the desulfurization gypsum during high-speed belt unloading, prevent it from splashing everywhere, and inhibit the spread of gypsum dust (especially in the dusty environment of steel plants). At the same time, it can also protect the unloading rollers, bearings and other components at the end of the belt conveyor to a certain extent, preventing impurities from entering.

[0004] However, under the actual operating conditions of steel plants, this fixed enclosure structure has significant technical defects:

[0005] Firstly, desulfurization gypsum materials typically have a certain degree of moisture and stickiness. During the unloading process, some gypsum inevitably spills and adheres to and accumulates inside the fixed casing, especially directly below the discharge port and in the narrow space between the casing and the end of the conveyor belt. The continuous production nature of steel plants often leads to untimely cleaning. This accumulated gypsum easily mixes with other dust that may be present in the steel plant environment, hardening and compacting. Not only is cleaning extremely difficult, but if the accumulation is too high, it can interfere with and rub against the running conveyor belt or rollers, posing a risk of belt jamming and equipment damage.

[0006] Secondly, steel plant equipment maintenance requires rapid response and minimal downtime. When it is necessary to inspect or maintain the discharge port of the desulfurization vacuum belt conveyor (such as adjusting the belt, replacing idlers, cleaning or repairing the unloading chute) or the receiving equipment below it, the entire fixed casing must be disassembled to obtain operating space. This disassembly and assembly process in heavy industrial environments usually involves hoisting and multiple people working together, which is not only time-consuming and labor-intensive, seriously affecting production rhythm and maintenance efficiency, but also easily damages the casing structure with repeated disassembly and assembly, leading to a decrease in its performance after reinstallation and exacerbating problems such as plaster splashing and dust emission.

[0007] Therefore, the above problems urgently need to be solved. Utility Model Content

[0008] The purpose of this utility model is to provide a cover device and a flue gas desulfurization system to solve the core pain points of difficult cleaning, inconvenient maintenance and poor covering effect of fixed cover in the desulfurization gypsum treatment of steel plants. It has significant practical value and promotion prospects.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] A cover device is provided for a desulfurization vacuum belt conveyor used to process desulfurized gypsum material. The cover device is used to cover the discharge port of the desulfurization vacuum belt conveyor. The cover device includes a frame, a cover, and a traveling mechanism, wherein:

[0011] The cover is applied to the outer periphery of the frame and together with the frame forms a cover body, and the cover body has an opening on at least one side.

[0012] The walking mechanism is located at the bottom of the housing body and is configured to carry the housing body to move, so that the housing body has a working position and a standby position.

[0013] When the cover body is in the working position, the cover body is disposed at the discharge port through the opening;

[0014] When the cover body is in the standby position, the cover body is completely separated from the discharge port of the desulfurization vacuum belt conveyor and the predetermined space area directly below the discharge port for receiving or containing spilled gypsum material, so that the discharge port and the predetermined space area are no longer covered by the structure of the cover body.

[0015] Preferably, the cover device further includes an alarm mechanism disposed on the cover body, the alarm mechanism being electrically connected to the desulfurization vacuum belt conveyor to move the cover body to issue an alarm when the desulfurization vacuum belt conveyor is in operation.

[0016] Preferably, the walking mechanism includes a plurality of casters disposed at the bottom of the frame.

[0017] Preferably, the walking mechanism further includes a track arranged along the extension direction of the discharge port, and a plurality of casters are distributed in at least one row, and the plurality of casters slide in cooperation with the track.

[0018] Preferably, the cover device further includes a positioning mechanism disposed between the desulfurization vacuum conveyor and the cover body, the positioning mechanism being configured to detachably fix the cover body covering the discharge port onto the desulfurization vacuum conveyor.

[0019] Preferably, the positioning mechanism includes a pin rod and a pin hole that can be inserted into each other. The desulfurization vacuum belt conveyor and the cover body are both provided with the pin hole. The two pin holes can be vertically connected, and the pin rod can pass through the two pin holes together.

[0020] Preferably, the caster includes a bracket, a wheel, and a brake assembly. The wheel is mounted on the bracket via a bearing, the bracket is mounted on the bottom of the frame, and the brake assembly is used to limit the rotation of the wheel.

[0021] Preferably, the frame is made of stainless steel.

[0022] Preferably, the cover is made of stainless steel.

[0023] A flue gas desulfurization system includes a desulfurization vacuum belt conveyor and the aforementioned cover device, wherein the cover device is used to cover the discharge port of the desulfurization vacuum belt conveyor.

[0024] The beneficial effects of this utility model are:

[0025] The discharge mask shell device provided by this utility model, through its unique structural design, effectively overcomes the shortcomings of existing technologies and has significant beneficial effects in the desulfurization gypsum treatment scenario of steel plants, specifically reflected in:

[0026] The structure achieves complete cleaning and maintenance space: the traveling mechanism drives the casing body to move between its working and standby positions. Crucially, when in the standby position, the casing body is completely spatially separated from the discharge port and the designated space directly below it for receiving or containing spilled gypsum material. In other words, when the casing body moves to the standby position, the critical area previously occupied or obscured by the casing body—the area directly below the discharge port where gypsum is most likely to spill, accumulate, and harden—is no longer physically occupied or obscured by the casing body structure. Therefore, it provides steel plant maintenance personnel with completely open and interference-free operating conditions for cleaning adhered and hardened gypsum deposits or using tools, fundamentally solving the problem of difficult cleaning inside fixed casings and reducing the risk of belt jamming caused by gypsum accumulation.

[0027] The structure simplifies the maintenance process and avoids repeated disassembly and reassembly: the traveling mechanism allows the casing to move to a standby position, exposing the entire discharge port area. Therefore, when inspection and maintenance of the conveyor discharge rollers, belts, cleaners, chutes, or equipment below are required, the necessary working space can be obtained simply by operating the traveling mechanism to move the casing. This process is significantly simplified in terms of structural operation compared to the complex process of overall disassembly, hoisting, and reinstallation required for a fixed casing. This maintenance preparation method, based on the movement of the traveling mechanism rather than disassembly, significantly reduces maintenance preparation time and improves maintenance efficiency under tight production schedules in steel mills.

[0028] The structure ensures the reliability of the shielding in the working position: Since daily cleaning and most maintenance operations no longer require disassembly of the shield body, only movement via the walking mechanism is needed. The opening in the shield body covers the discharge port in the working position, thus preventing repeated stress, deformation, or damage from frequent disassembly and assembly. This avoids physical damage to the shielding interface caused by structural disassembly and assembly, thereby maintaining the shielding effect of the structure in the working position for a long time, and more effectively suppressing the leakage of gypsum dust and material splashing in the steel plant environment.

[0029] In summary, this utility model drives the cover body to move between the working position and the standby position through a walking mechanism. In particular, its standby position achieves complete spatial separation from the discharge port and the key material accumulation area below in terms of structure. This directly solves the core pain points of difficult cleaning, inconvenient maintenance, and poor masking effect of the fixed cover in the desulfurization gypsum treatment of steel plants. It has significant practical value and promotion prospects. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the cover device provided by this utility model;

[0031] Figure 2 This is a schematic diagram of the walking mechanism provided by this utility model;

[0032] Figure 3 This is a schematic diagram of the positioning mechanism provided by this utility model.

[0033] In the picture:

[0034] 1. Frame; 2. Cover; 3. Walking mechanism; 31. Casters; 32. Rail; 4. Positioning mechanism; 41. Pin rod; 42. Pin hole; 43. Positioning plate. Detailed Implementation

[0035] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0036] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] In this application, the term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump can represent: the existence of only one centrifugal vortex magnetic pump, the simultaneous existence of one centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump, or the existence of only one centrifugal vortex magnetic pump. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0038] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0039] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0040] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0041] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0042] Please see Figures 1 to 3 This embodiment provides a cover device for covering the discharge port of a desulfurization vacuum conveyor belt. The cover device includes a frame 1, a cover 2, and a traveling mechanism 3. The cover 2 covers the outer periphery of the frame 1 and forms a cover body with the frame 1. The cover body has an opening on at least one side. The traveling mechanism 3 is located at the bottom of the cover body and is configured to carry the cover body to move, allowing the cover body to have a working position and a standby position. When the cover body is in the working position, it is covered at the discharge port through an opening. When the cover body is in the standby position, it is completely detached from the discharge port of the desulfurization vacuum conveyor belt and the predetermined space area directly below the discharge port for receiving or accommodating spilled gypsum material, so that the discharge port and the predetermined space area are no longer obscured by the structure of the cover body.

[0043] This configuration, through its unique structural design, effectively overcomes the shortcomings of existing technologies and demonstrates significant benefits in the desulfurization gypsum treatment scenario of steel plants, specifically in the following ways:

[0044] Structurally, it achieves complete cleaning and maintenance space: the traveling mechanism 3 drives the casing body to move between its working position and standby position. Crucially, when in the standby position, the casing body is completely spatially separated from the discharge port and the designated space directly below it for receiving or containing spilled gypsum material. That is, when the casing body moves to the standby position, the critical area previously occupied or obscured by the casing body—the area directly below the discharge port where gypsum is most likely to spill, accumulate, and harden—is no longer physically occupied or obscured by the casing body structure. Therefore, it provides steel plant maintenance personnel with completely open and interference-free operating conditions for cleaning adhered and hardened gypsum deposits or using tools, fundamentally solving the problem of difficult cleaning inside the fixed casing and reducing the risk of belt jamming caused by gypsum accumulation.

[0045] The structure simplifies the maintenance process and avoids repeated disassembly and assembly: The traveling mechanism 3 allows the casing to move to a standby position, exposing the entire discharge port area. Therefore, when inspection and maintenance of the conveyor discharge rollers, belts, cleaners, chutes, or lower equipment are required, simply moving the casing using the traveling mechanism 3 provides the necessary working space. This process is significantly simplified compared to the complex process of overall disassembly, hoisting, and reinstallation required for a fixed casing. This maintenance preparation method, based on the movement of the traveling mechanism 3 rather than disassembly, significantly reduces maintenance preparation time and improves maintenance efficiency under tight production schedules in steel mills.

[0046] The structure ensures the reliability of the shielding in the working position: Since daily cleaning and most maintenance operations no longer require disassembling the shield body, it only needs to be moved via the walking mechanism 3. The shield body's opening covers the discharge port in the working position, preventing repeated stress, deformation, or damage from frequent disassembly and assembly. This avoids physical damage to the shielding interface caused by structural disassembly and assembly, thus maintaining the shielding effect of the structure in the working position for a long time, and more effectively suppressing the leakage of gypsum dust and material splashing in the steel plant environment.

[0047] In summary, this utility model drives the cover body to move between the working position and the standby position through the walking mechanism 3. In particular, its standby position achieves complete spatial separation from the discharge port and the key material accumulation area below in terms of structure. It directly solves the core pain points of difficult cleaning, inconvenient maintenance and affecting the masking effect of the fixed cover in the desulfurization gypsum treatment of steel plants. It has significant practical value and promotion prospects.

[0048] Generally speaking, when a desulfurization vacuum belt conveyor is working, the belt is moving at high speed. If the cover body moves at this time, the operator may be at risk of being injured by the moving parts, or it may cause problems such as material spillage and dust spread.

[0049] Therefore, in this embodiment, the cover device also includes an alarm mechanism (not shown in the figure) disposed on the cover body. The alarm mechanism is electrically connected to the desulfurization vacuum conveyor belt to move the cover body and issue an alarm when the desulfurization vacuum conveyor belt is in operation. It is understood that the alarm mechanism can promptly remind on-site operators of any abnormal situation, enabling them to react quickly, such as stopping relevant operations or moving away from dangerous areas, thereby effectively ensuring the personal safety of the operators.

[0050] It should be noted that the alarm mechanism is selected from existing technologies and consists of components such as sensors and alarms. Through the coordinated work of sensors and alarms, real-time monitoring and timely alarm of the status of the enclosure device can be achieved, thus ensuring the safe operation of the desulfurization vacuum belt conveyor.

[0051] For example, a photoelectric displacement sensor is selected as the sensor, which detects changes in the displacement of an object by emitting and receiving light signals. An audible and visual alarm is selected, which attracts attention by emitting strong flashing lights and a loud sound. In the application scenario of this embodiment, when the casing moves, it causes a change in the light signal detected by the sensor, which is then converted into an electrical signal output to determine whether the casing has moved and the distance it has moved. When the desulfurization vacuum conveyor belt is operating, if movement of the casing is detected, the relevant sensor transmits a signal to the audible and visual alarm, activating it and emitting an audible and visual signal.

[0052] Specifically, the walking mechanism 3 includes several casters 31 disposed at the bottom of the frame 1. The casters 31 enable the casing body to move smoothly, facilitating switching between working and standby positions. The casters 31 have low rolling friction, making operation more convenient; only a small external force is needed to move the casing body, improving work efficiency. It is worth noting that the number and distribution of the casters 31 can be selected according to the actual application scenario; this embodiment does not impose specific requirements or limitations in this regard. Furthermore, the specific model of the casters 31 can be selected according to different working environments and ground conditions. For example, casters 31 with wear-resistant, corrosion-resistant, and anti-slip properties can be used to adapt to the industrial environment where the desulfurization vacuum belt conveyor is located, including humid, dusty, and corrosive media conditions, ensuring stable and reliable movement of the casing body under various conditions.

[0053] To ensure that the cover body moves accurately along the extension direction of the discharge port, the traveling mechanism 3 also includes a track 32 arranged along the extension direction of the discharge port, and several casters 31 are distributed in at least one row, and the casters 31 slide and cooperate with the track 32, thereby avoiding the offset or shaking of the cover body during the travel process, making the cover body more accurate when covering and removing the discharge port, improving the covering effect of the discharge port, and reducing the possibility of material leakage.

[0054] In harsh working environments, such as when the ground is wet, oily, or littered, the track 32 provides relatively clean and stable walking conditions for the casters 31, reducing the impact of external factors on the rolling of the casters 31 and ensuring the normal movement of the housing body. Furthermore, the track 32 can be specially designed and protected according to the specific working environment, such as using anti-corrosion and rust-proof materials, further improving its environmental adaptability. In this embodiment, four casters 31 are provided, arranged in two rows. Two tracks 32 are correspondingly provided, with each track 32 corresponding to one row of casters 31.

[0055] It should be noted that the specific models of caster 31 and rail 32 can be selected according to the actual application scenario. For example, caster 31 with V-groove and convex rail can be used. The convex rail has a convex cross section and can be embedded in the V-groove of caster 31 to achieve sliding fit.

[0056] In this embodiment, the caster 31 includes a bracket, a wheel, and a brake assembly. The wheel is mounted on the bracket via bearings, and the bracket is mounted on the bottom of the frame 1. The brake assembly is used to limit the rotation of the wheel. It is understood that the brake assembly restricts the wheel's rotation. After the housing body moves to a designated position, the brake assembly brakes the wheel, precisely fixing the housing's position and preventing unnecessary movement due to external forces or uneven ground, further improving the accuracy of housing positioning. The brake assembly mainly consists of brake pads, a brake caliper, a lever mechanism, and a return spring. The brake pads are typically made of wear-resistant material and are installed inside the brake caliper. The lever mechanism is connected to the brake pedal or handle. When the brake pedal or handle is operated, the lever mechanism moves the brake caliper, causing the brake pads to press tightly against the wheel edge, preventing wheel rotation through friction. The return spring returns the brake caliper and brake pads to their initial position when the brake is released.

[0057] To ensure the cover body is accurately positioned over the discharge port and to guarantee the relative positional accuracy between the cover and the discharge port, the cover device also includes a positioning mechanism 4 located between the desulfurization vacuum conveyor and the cover body. The positioning mechanism 4 is configured to detachably fix the cover body over the discharge port to the desulfurization vacuum conveyor. This configuration, by detachably fixing the cover body to the desulfurization vacuum conveyor, effectively prevents the cover from shifting or shaking due to vibration, external impact, or other factors during equipment operation. This improves the stability of the cover, thereby ensuring its effective coverage of the discharge port and reducing material loss and environmental pollution caused by inadequate coverage.

[0058] Specifically, the positioning mechanism 4 includes a pin rod 41 and a pin hole 42 that can be inserted into each other. Both the desulfurization vacuum conveyor and the cover body are provided with pin holes 42, which are vertically connected, and the pin rod 41 can pass through both pin holes 42 simultaneously. Specifically, both the desulfurization vacuum conveyor and the cover body are provided with a positioning plate 43, and each positioning plate 43 has a pin hole 42. It is understood that the positioning mechanism 4 composed of the pin rod 41 and the pin hole 42 has a simple structure and low operating cost. In other embodiments, more complex positioning mechanisms 4 such as magnetic positioners or hydraulic positioners can also be used, so they will not be described in detail here.

[0059] It is worth noting that in the environment where the desulfurization vacuum belt conveyor operates, the casing may come into contact with various chemicals, such as the slurry used in the desulfurization process. Therefore, to extend the service life of the casing, the frame 1 is made of stainless steel. Stainless steel has strong corrosion resistance, which helps to ensure the structural integrity and stability of the frame 1 and extend its service life. Similarly, in this embodiment, the cover 2 is made of stainless steel.

[0060] This embodiment also provides a flue gas desulfurization system, which includes a desulfurization vacuum belt conveyor and the aforementioned cover device. The cover device is used to cover the discharge port of the desulfurization vacuum belt conveyor. It is understood that the flue gas desulfurization system including the aforementioned cover device can prevent material accumulation inside the cover from jamming the belt. Furthermore, it eliminates the need for repeated disassembly and assembly, allowing for adjustment of the discharge port position or maintenance of adjacent components, significantly saving time spent on disassembling and assembling the cover and improving work efficiency.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A casing device for covering a discharge opening of a desulfurization vacuum belt conveyor for handling desulfurized gypsum material, characterized in that, The enclosure device includes a frame (1), a cover (2), and a walking mechanism (3), wherein: The cover (2) is applied to the outer periphery of the frame (1) and forms a cover body with the frame (1). The cover body has an opening on at least one side. The walking mechanism (3) is located at the bottom of the cover body. The walking mechanism (3) is configured to carry the cover body to move, so that the cover body has a working position and a standby position. When the cover body is in the working position, the cover body is disposed at the discharge port through the opening; When the cover body is in the standby position, the cover body is completely separated from the discharge port of the desulfurization vacuum belt conveyor and the predetermined space area directly below the discharge port for receiving or containing spilled gypsum material, so that the discharge port and the predetermined space area are no longer covered by the structure of the cover body.

2. A housing device according to claim 1, wherein The cover device also includes an alarm mechanism disposed on the cover body, the alarm mechanism being electrically connected to the desulfurization vacuum belt conveyor to move the cover body to issue an alarm when the desulfurization vacuum belt conveyor is in operation.

3. A housing device according to claim 1, wherein The walking mechanism (3) includes several casters (31) disposed at the bottom of the frame (1).

4. A housing device according to claim 3, wherein The walking mechanism (3) further includes a track (32) arranged along the extension direction of the discharge port, and a plurality of casters (31) are arranged in at least one row, and the plurality of casters (31) slide in cooperation with the track (32).

5. The enclosure apparatus of claim 1, wherein, The cover device further includes a positioning mechanism (4) disposed between the desulfurization vacuum conveyor and the cover body, the positioning mechanism (4) being configured to detachably fix the cover body covering the discharge port onto the desulfurization vacuum conveyor.

6. A housing device according to claim 5, wherein The positioning mechanism (4) includes a pin rod (41) and a pin hole (42) that can be inserted into each other. The desulfurization vacuum belt conveyor and the cover body are both provided with the pin hole (42). The two pin holes (42) can be vertically connected, and the pin rod (41) can pass through the two pin holes (42) together.

7. A housing device according to claim 3, wherein The caster (31) includes a bracket, a wheel and a brake assembly. The wheel is mounted on the bracket via a bearing. The bracket is mounted on the bottom of the frame (1). The brake assembly is used to restrict the rotation of the wheel.

8. The enclosure apparatus of claim 1, wherein, The frame (1) is made of stainless steel.

9. A housing device according to claim 8, wherein The cover (2) is made of stainless steel.

10. A flue gas desulfurization system characterized by, The flue gas desulfurization system includes a desulfurization vacuum belt conveyor and a cover device as described in any one of claims 1-9, wherein the cover device is used to cover the discharge port of the desulfurization vacuum belt conveyor.

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