A recovery device for removing mercury from natural gas on offshore platforms

Abstract

The utility model discloses a recovery device for offshore platform natural gas demercuration, including base table and the demercuration recovery tower of fixed in the base table top surface one side, its characterized in that, demercuration recovery tower includes tower base, the top surface of tower base is pasted with soft rubber pad, is used for pasting seal, and the bottom end center of tower base is fixed with drainage pipe, the bottom surface of tower base is distributed with drive motor in two corners, and the top end axle of drive motor is connected with drive sprocket, and one side of drive sprocket is engaged with chain, and the other two corners of chain are engaged with transmission sprocket and are used for the synchronous transmission of drive sprocket and transmission sprocket. The recovery device is driven by the drive sprocket rotation of the drive motor built-in tower base, and two groups of drive motor adopt potentiometer parallel control, and synchronous transmission is made to drive sprocket cooperation chain and transmission sprocket, so that the threaded shaft is driven, and the tower outer frame is lifted at uniform speed, which is convenient for the user to add or replace the filter filler, and other equipment cooperation is not needed, and the operation is convenient and quick.

Description

Technical Field

[0001] This utility model relates to the field of natural gas mercury removal technology, specifically a recovery device for natural gas mercury removal on offshore platforms. Background Technology

[0002] The mercury content in natural gas is typically 1-200 μg / m³ 3 During cryogenic liquefaction, mercury can corrode the cold box of aluminum alloy plate-fin heat exchangers and cause catalyst poisoning. Offshore platforms have limited space and harsh environments, requiring a balance between efficient mercury removal and equipment compactness. Ineffective mercury removal can lead to corrosion of the cold box. Common mainstream mercury removal methods include fixed-bed adsorption and cryogenic condensation. Using sulfur-loaded activated carbon, metal sulfides, or silver-loaded molecular sieves, mercury removal rates exceed 90%, making them suitable for modular designs on offshore platforms. For example, silver-loaded molecular sieves can simultaneously adsorb moisture and mercury and can be reused through thermal regeneration. The condensation method involves cooling natural gas to below -40°C to liquefy and separate mercury, achieving mercury removal rates exceeding 90%, making it suitable for processing natural gas with high mercury content.

[0003] Existing methods for removing mercury from natural gas mainly employ non-renewable chemical adsorption. This method involves adsorption through internal filter media. When mercury-containing natural gas enters the mercury removal reaction tower, it undergoes filtration. The liquid to be separated in the mercury-containing natural gas collects into droplets at the filter media and drips down under gravity. Meanwhile, the mercury-free natural gas flows towards the top of the mercury removal reaction tower under the action of a low-pressure vacuum compressor and is discharged from the mercury removal reaction tower through the low-pressure vacuum compressor, thus completing the mercury removal and recovery process.

[0004] When the aforementioned mercury removal and recovery equipment is applied to offshore platforms, its structure is typically dispersed and fixed. The limited space on offshore platforms makes maintenance extremely inconvenient. More significantly, after long-term use, when the internal filter media needs replacement, the reaction tower is usually a fixed, integral structure. Replacing the media often requires lifting the tower cover or internal components entirely with hoisting equipment. This process is not only cumbersome and time-consuming, but also presents significant challenges and risks on the confined space and complex environment of offshore platforms. Therefore, we propose a mercury recovery device for natural gas removal on offshore platforms. Utility Model Content

[0005] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] The purpose of this invention is to provide a recovery device for mercury removal from natural gas on offshore platforms, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a recovery device for removing mercury from natural gas on an offshore platform, comprising a base platform and a mercury removal and recovery tower fixed to one side of the top surface of the base platform, characterized in that the mercury removal and recovery tower includes a tower base, the top surface of the tower base is fitted with a soft rubber pad for sealing, and a drain pipe is fixed at the center of the bottom end of the tower base. The base of the tower has two drive motors distributed at the bottom corners, and a drive sprocket is connected to the top of the drive motor. A chain is engaged on one side of the drive sprocket, and a transmission sprocket is engaged at the other two corners of the chain for synchronous transmission between the drive sprocket and the transmission sprocket. The drive sprocket and transmission sprocket have threaded shafts fixed to their top surfaces. The top of the threaded shaft is threaded to the outer frame of the tower. An air inlet is fixed to one side of the outer wall of the tower frame for introducing natural gas. A filter rack is fixed to the center of the top surface of the tower base, and connecting rods are fixed to both sides of the filter rack. The top of the filter rack is connected to an exhaust port for discharging purified natural gas.

[0008] Furthermore, the tower base is fixedly connected to the bottom of the filter media rack, and the filter media rack is connected to the exhaust port and the drain pipe at the top and bottom.

[0009] Furthermore, the tower base is engaged with the bottom of the tower outer frame by a soft rubber pad, and the soft rubber pad is evenly attached to the top surface of the tower base.

[0010] Furthermore, the outer frame of the tower, through its threaded engagement with the threaded shaft, forms a lifting transmission structure with the tower base.

[0011] Furthermore, the drive sprocket and the transmission sprocket are synchronously driven by the chain, and the drive sprocket is driven to rotate by the drive motor.

[0012] Furthermore, the base platform includes a support platform, and support rods are fixed to the four perimeter of the support platform. A connecting pipe is fixed to one side of the inside of the support platform. A tower base and a power distribution cabinet are fixed to the top surface of the support platform, and a low-pressure vacuum compressor is fixed to the top surface of the power distribution cabinet.

[0013] Furthermore, the support rod is fixedly connected to the support platform around its perimeter, and the connecting pipe is connected to the drain pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This utility model uses a drive motor built into the tower base to drive the drive sprocket to rotate. The two sets of drive motors are controlled in parallel by potentiometers. The drive sprocket, in conjunction with the chain and transmission sprocket, drives the threaded shafts around the tower at the same time, causing the outer frame of the tower to rise at a uniform speed, thereby exposing the internal filter media rack. This makes it convenient for users to add or replace the filter media, eliminating the dependence on large lifting equipment and making it particularly suitable for the special operating environment of offshore platforms. This utility model maintains the seal by using a soft rubber gasket between the tower base and the outer frame of the tower, while the internal filter media rack can be filled with filter packing for mercury removal and recovery. The natural gas can be discharged through the exhaust port at the top, while the liquid to be separated in the mercury-containing natural gas is collected into droplets in the filter packing and discharged with the bottom drain pipe, maintaining a stable mercury removal and recovery process. This utility model provides stable mounting and support for the mercury removal and recovery tower and the power distribution cabinet through the support platform at the bottom, forming a modular design with a small overall footprint. The support rods distributed around the perimeter provide structural support for the support platform, thereby maintaining the stability of the internal structure. The power distribution cabinet and low-pressure vacuum compressor mounted on the top provide stable assistance for the discharge and recovery of natural gas. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the main body of this utility model; Figure 2 This is a three-dimensional structural diagram of the mercury removal and recovery tower of this utility model; Figure 3 This is a schematic diagram of the bottom structure of the tower base of this utility model; Figure 4 This is a three-dimensional structural diagram of the filter media holder of this utility model.

[0016] In the diagram: 1. Base platform; 101. Support platform; 102. Support rod; 103. Connecting pipe; 104. Power distribution cabinet; 105. Low-pressure vacuum compressor; 2. Mercury removal and recovery tower; 201. Tower base; 202. Soft rubber pad; 203. Drain pipe; 204. Drive motor; 205. Drive sprocket; 206. Chain; 207. Transmission sprocket; 208. Threaded shaft; 209. Tower outer frame; 210. Air inlet; 211. Filter media rack; 212. Connecting rod; 213. Exhaust port. Detailed Implementation

[0017] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0018] It should also be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0019] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies. It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0020] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This utility model provides, for example Figure 1-4 The device shown is a mercury recovery unit for natural gas removal from offshore platforms. It includes a base platform 1, a mercury recovery tower 2 fixed on one side of the top surface of the base platform 1, a support platform 101, and support rods 102 fixed on the four periphery of the support platform 101. A connecting pipe 103 is fixed on one side of the inside of the support platform 101. A tower base 201 and a power distribution cabinet 104 are fixed on the top surface of the support platform 101, and a low-pressure vacuum compressor 105 is fixed on the top surface of the power distribution cabinet 104. To ensure the overall structural stability of this mercury removal and recovery device during operation, such as Figure 1 As shown, this mercury removal and recovery device provides stable support for the mercury removal and recovery tower 2 and the power distribution cabinet 104 through the support platform 101 at the bottom, forming a modular design with a small overall footprint. The support rods 102 distributed around the perimeter provide structural support for the support platform 101, thereby maintaining the stability of the internal structure. The power distribution cabinet 104 and the low-pressure vacuum compressor 105 mounted on the top provide stable assistance for the discharge and recovery of natural gas.

[0022] like Figure 2-4As shown, the mercury removal and recovery tower 2 includes a tower base 201, and a soft rubber pad 202 is attached to the top surface of the tower base 201. A drain pipe 203 is fixed at the center of the bottom end of the tower base 201. Drive motors 204 are distributed at the two corners of the bottom surface of the tower base 201. A drive sprocket 205 is shaft-connected to the top of the drive motor 204. A chain 206 is meshed on one side of the drive sprocket 205. A transmission sprocket 207 is meshed at the other two corners of the chain 206. A threaded shaft 208 is fixed at the center of the top surface of the drive sprocket 205 and the transmission sprocket 207. A tower outer frame 209 is threaded to the top of the threaded shaft 208. An air inlet 210 is fixed on one side of the outer wall of the tower outer frame 209. A filter rack 211 is fixed at the center of the top surface of the tower base 201. Connecting rods 212 are fixed on both sides of the filter rack 211. An exhaust port 213 is connected to the top of the filter rack 211. To facilitate the operation of this mercury removal and recovery equipment, such as Figure 2-4 As shown, this recovery device can maintain its airtightness through the soft rubber gasket 202 between the tower base 201 and the tower outer frame 209, while the internal filter rack 211 can be filled with filter packing such as sulfur-loaded activated carbon or HgSIV molecular sieve to perform mercury removal and recovery. Its natural gas can be discharged through the exhaust port 213 at the top, while the liquid to be separated in the mercury-containing natural gas is collected into droplets in the filter packing and discharged in conjunction with the bottom drain pipe 203 to maintain a stable mercury removal and recovery process. The mercury removal and recovery tower 2 described above can also drive the drive sprocket 205 to rotate via the drive motor 204 built into the tower base 201. The two sets of drive motors 204 are controlled in parallel by potentiometers and share a regulated power supply through two frequency converters. The speed can be adjusted proportionally by adjusting the potentiometers. This type of control method is common and widely used in the existing technology, so it will not be described in detail here. The drive sprocket 205, in conjunction with the chain 206 and the transmission sprocket 207, drives the threaded shafts 208 around the tower simultaneously, causing the outer frame 209 of the tower to rise at a uniform speed, thereby exposing the internal filter media rack 211. This allows users to easily add or replace the filter media without the need for other equipment, making the operation convenient and quick.

[0023] In summary, when using this recycling device, the user first drives the drive sprocket 205 to rotate via the drive motor 204. The rotating drive sprocket 205 then drives the chain 206 and the transmission sprocket 207 to rotate synchronously. This causes the threaded shafts 208 fixed to the top surfaces of the transmission sprocket 207 and the drive sprocket 205 to rotate synchronously as well. The synchronously rotating threaded shafts 208 are connected to the four sections of the outer frame 209 via threads, forming a lifting process. Once the outer frame 209 is raised to a certain height, the internal filter media rack 211 is exposed. At this point, the user places the filter media that needs to be filled or replaced into the disc-shaped filter plate inside the filter media rack 211. Then, the outer frame 209 is lowered and closed again to complete the filter media replacement operation.

[0024] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of this disclosure is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A mercury recovery device for natural gas removal from offshore platforms, comprising a base platform (1) and a mercury recovery tower (2) fixed to one side of the top surface of the base platform (1), characterized in that, The mercury removal and recovery tower (2) includes a tower base (201), and a soft rubber pad (202) is attached to the top surface of the tower base (201) for sealing. A drain pipe (203) is fixed at the center of the bottom end of the tower base (201). The bottom surface of the tower base (201) has two corners where drive motors (204) are distributed, and the top of the drive motor (204) is connected to a drive sprocket (205). A chain (206) is engaged on one side of the drive sprocket (205), and a transmission sprocket (207) is engaged on the other two corners of the chain (206) and is used for synchronous transmission between the drive sprocket (205) and the transmission sprocket (207). The drive sprocket (205) and transmission sprocket (207) have a threaded shaft (208) fixed to their top shafts. The top of the threaded shaft (208) is threaded to the outer frame of the tower (209). An air inlet (210) is fixed to one side of the outer wall of the outer frame of the tower (209) for introducing natural gas. A filter rack (211) is fixed to the center of the top surface of the tower base (201). A connecting rod (212) is fixed to both sides of the filter rack (211). An exhaust port (213) is connected to the top of the filter rack (211) for discharging purified natural gas.

2. A recovery device for mercury removal from natural gas on offshore platforms according to claim 1, characterized in that, The tower base (201) is fixedly connected to the bottom of the filter media rack (211), and the filter media rack (211) is connected to the exhaust port (213) and the drain pipe (203) at the top and bottom.

3. A recovery device for mercury removal from natural gas on offshore platforms according to claim 1, characterized in that, The tower base (201) is engaged with the bottom of the tower outer frame (209) by means of a soft rubber pad (202), and the soft rubber pad (202) is evenly attached to the top surface of the tower base (201).

4. A recovery device for mercury removal from natural gas on offshore platforms according to claim 1, characterized in that, The outer frame of the tower (209) forms a lifting transmission structure with the tower base (201) through its threaded engagement with the threaded shaft (208).

5. A recovery device for mercury removal from natural gas on offshore platforms according to claim 1, characterized in that, The drive sprocket (205) and the transmission sprocket (207) are synchronously driven by the chain (206), and the drive sprocket (205) is driven to rotate by the drive motor (204).

6. A recovery device for mercury removal from natural gas on offshore platforms according to claim 1, characterized in that, The base platform (1) includes a support platform (101), and support rods (102) are fixed to the four periphery of the support platform (101). A connecting pipe (103) is fixed to one side of the inside of the support platform (101). A tower base (201) and a power distribution cabinet (104) are fixed to the top surface of the support platform (101), and a low-pressure vacuum compressor (105) is fixed to the top surface of the power distribution cabinet (104).

7. A recovery device for mercury removal from natural gas on offshore platforms according to claim 6, characterized in that, The support rod (102) is fixedly connected to the support platform (101) around the perimeter, and the connecting pipe (103) is connected to the drain pipe (203).

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