Sealing control system of solid amine desorption equipment

Abstract

The utility model relates to a sealing control system of solid amine desorption equipment. The sealing control system comprises vacuum desorption equipment, the two hollow spiral pipes are arranged in the cavity of the vacuum desorption equipment in parallel up and down in the horizontal direction, and two shaft end parts, located on one side of the vacuum desorption equipment, of the two hollow spiral pipes extend out of the cavity of the vacuum desorption equipment and are respectively communicated with a communicating pipe through a rotary joint; the other shaft ends of the two hollow spiral pipes extend out of the other side of the vacuum desorption equipment cavity; a plurality of exhaust ports are formed in the top of a cavity of the vacuum desorption equipment, each exhaust port is connected with an exhaust branch pipe, the exhaust branch pipes are connected with an exhaust main pipe, and a vacuum pump is connected to the exhaust main pipe; the oxygen detector is connected to the exhaust manifold; and the controller is in signal connection with the oxygen detector and the vacuum pump. The sealing control system of the solid amine desorption equipment can realize the sealing effect and ensure the continuous and stable operation of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of solid amine desorption, and in particular to a sealing control system for a solid amine desorption device. Background Technology

[0002] Solid amine materials can adsorb CO2 at room temperature, but desorption requires heating to 100-150℃. However, at this temperature, they are easily oxidized. Although vacuum desorption can lower the desorption temperature to some extent, it still requires the isolation of oxygen. While spiral vacuum desorption equipment is widely used, traditional equipment does not have high requirements for sealing, making it easy for air to leak into the equipment. However, when applied to solid amine materials, complete oxygen isolation is required. Real-time monitoring of oxygen levels within the system is essential to ensure that, in the event of seal failure, sealing gases such as nitrogen are replenished to prevent oxygen from entering and oxidizing the material. Therefore, it is necessary to solve the sealing and seal control issues of spiral desorption equipment.

[0003] Vacuum spiral desorption of CO2 is a suitable process for desorbing CO2 from solid amines. This process utilizes a vacuum pump to create a high degree of vacuum, which, under heating conditions, allows the adsorbed CO2 in the solid amine to be desorbed. Vacuum desorption has two advantages: First, solid amine materials are easily oxidized, especially at temperatures exceeding 100°C. Vacuum desorption can avoid the oxidation of solid materials by oxygen under high-temperature conditions, preventing material deactivation. Second, it can lower the desorption temperature and reduce the desorption heat energy. High-temperature hot water, low-temperature steam, etc., can all be used as heating media, which is beneficial for the application of this process in various scenarios.

[0004] Patent CN221674218U discloses a solid amine vacuum desorption device. It utilizes solid amine material that has adsorbed carbon dioxide, heating it to approximately 90-120°C and desorbing the carbon dioxide under vacuum. A stirring paddle inside the vacuum mixing tank accelerates the desorption process. However, solid amine is a micron-sized material with low specific gravity. Under vacuum, stirring with a paddle makes it easier for the solid amine material to float into the carbon dioxide desorption pipe, causing blockage of the vacuum pump's isolation membrane and resulting in poor desorption efficiency.

[0005] Although spiral vacuum desorption equipment is widely used, traditional equipment does not have high requirements for sealing, and air can easily leak into the equipment. However, when applied to solid amine materials, it is necessary to completely isolate oxygen. It is essential to monitor the oxygen in the system in real time and ensure that in the event of seal failure, sealing gases such as nitrogen are added to prevent oxygen from entering the oxidizing material.

[0006] Solid amine materials contain a large amount of fine powder, which can enter the downstream vacuum pump with the airflow during desorption, causing pump blockage and damage. Therefore, a suitable device for separating fine powder is needed to ensure continuous operation of the equipment under vacuum. However, traditional filter separators are prone to clogging, and once clogged, air can easily leak into the equipment's seals, making it impossible to guarantee vacuum. Therefore, it is necessary to solve the sealing and seal control issues of the spiral desorption equipment. Summary of the Invention

[0007] The purpose of this invention is to provide a sealing control system for a solid amine desorption device. This invention is simple, practical, and can achieve a sealing effect while ensuring continuous and stable operation of the device.

[0008] To address the problems in the existing technology, this utility model adopts the following technical solution:

[0009] A sealed control system for a solid amine desorption device, used for carbon dioxide desorption from solid amines adsorbed with carbon dioxide, comprising:

[0010] A vacuum desorption device having a cavity, one side of which is connected to a feed pipe;

[0011] Two hollow spiral tubes are arranged horizontally and vertically in the cavity of the vacuum desorption device. The two shaft ends of the two hollow spiral tubes on one side of the vacuum desorption device extend out of the cavity of the vacuum desorption device and are connected to a connecting pipe through a rotary joint.

[0012] The other end of the two hollow spiral tubes extends out to the other side of the vacuum desorption equipment cavity;

[0013] A double-end mechanical seal is provided between the shaft end of the hollow spiral tube and the cavity wall of the vacuum desorption device;

[0014] The motor's drive shaft is connected to two hollow spiral tubes via a gear transmission assembly, enabling the two hollow spiral tubes to rotate along their own axes.

[0015] The top of the cavity of the vacuum desorption device is provided with multiple exhaust ports, each exhaust port is connected to an exhaust branch pipe, the multiple exhaust branch pipes are connected to an exhaust main pipe, and a vacuum pump is connected to the exhaust main pipe.

[0016] An oxygen detector is connected to the exhaust manifold and located behind the vacuum pump;

[0017] The controller has its signal input terminal connected to the oxygen detector and its signal output terminal connected to the vacuum pump.

[0018] The top of the cavity of the vacuum desorption device is provided with a filter exhaust cover. The top opening of the filter exhaust cover is connected to the exhaust branch pipe, and the side opening is connected to the carbon dioxide backflushing device.

[0019] Inside the cavity of the vacuum desorption device, above the hollow spiral tube, a filter A is installed. The filter A has a pointed structure and can cover the hollow spiral tube, separating it from the exhaust port.

[0020] A vibrator is provided at the connection between the edge of filter A and the inner wall of the vacuum desorption device.

[0021] The filter exhaust cover has a double-layer structure. The inner layer is equipped with filter B, and the outer layer is the exhaust cover shell. Multiple backflush holes are distributed on the exhaust cover shell for introducing backflush gas.

[0022] The filter B is composed of multiple layers, with a filtration accuracy of 1 to 5 μm.

[0023] The bottom of the filter exhaust cover is provided with a downward-opening double partition, which includes partition a1 and partition a2, and a support spring is provided between the bottom of the double partition and the exhaust cover shell.

[0024] It also includes a gas replenishment device connected to the cavity of the vacuum desorption equipment, used to replenish the cavity of the vacuum desorption equipment with inert gas or carbon dioxide, and the signal output terminal of the controller is connected to the gas replenishment device.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] First, install an oxygen concentration monitor at the vacuum pump outlet. If oxygen is detected, it indicates that there is a leak in the desorption equipment. At this time, the vacuum pump is stopped and inert gases such as nitrogen or CO2 are added to the equipment to create a slight positive pressure inside the desorption equipment to prevent oxygen from leaking into the equipment.

[0027] Secondly, the exhaust port is designed with multiple outlets, each equipped with a filter screen exhaust cover and connected to a vacuum pump. During normal desorption, some outlets are opened and some are closed. Carbon dioxide is used to backflush the closed filter screen bundle to eliminate the blockage of small particles on the filter screen and prevent it from affecting desorption.

[0028] Third, excessively fine powder can easily clog the filter screen, causing frequent backflushing. Therefore, a filter screen layer is installed above the spiral shaft and in front of the exhaust port to cover the entire spiral desorption device. Vibrators are arranged at the four corners of the filter screen layer and vibrate at intervals. This can intercept most of the small-diameter material that escapes from the bed surface of the desorption device with the gas. The filter screen has a pointed structure to allow the small amount of small-diameter material that is backflushed down by the filter screen bundle and adheres to the wall to fall into the desorption device.

[0029] Fourth, the filter screen exhaust cover has a two-layer structure with inner and outer cylinders. The inner layer is the filter screen, and the outer layer is the outer shell. There are several small air holes between the inner and outer layers to spray compressed CO2 into the inner layer, reducing the accumulation of fine powder that clogs the filter screen. After spraying, the fine powder falls to the bottom of the filter screen. Two symmetrical downward-opening baffle structures are set at the bottom, tightly connected, and supported by a spring structure. A spring with a certain elastic coefficient is selected. When there is no powder on the baffle, the bottom of the inner cylinder is kept sealed. When more powder falls into the baffle, it opens downward under the action of gravity, allowing all the fine powder to flow out. The spring returns to its original state, and the inner bottom closes. Through this combination design of the separator mechanism, all solids and gases in the bubbling bed are completely separated. The collected gas does not contain powder impurities, which is beneficial to downstream equipment and pipelines. Moreover, this combination design can reduce the wear of solid amine fine powder materials and extend the material's cycle time.

[0030] Fifth, a two-stage filter is installed. The first stage covers the plane of the desorption equipment cavity, and the filter screen pore size is slightly larger than that of the second stage. Most of the fine powder will be intercepted in it. The filter screen is connected to a rapping mechanism to make the fine powder on the filter screen fall off. The second stage filter screen is located in the airflow outlet channel. Because the pore size is too small, this part is easy to clog. After clogging, the pressure difference between the inside and outside of the mechanical seal end increases, which will allow oxygen to leak in. Therefore, the second stage filter screen is equipped with a backflushing device. In order to ensure the purity of the collected gas, CO2 gas is required for backflushing.

[0031] Sixth, the hollow spiral tube is equipped with double-end mechanical seals at both ends to ensure a sealing effect under extremely low vacuum. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the cross-sectional structure of the filter screen exhaust cover.

[0034] Among them, 1 is the feed hopper, 2 is the vacuum desorption equipment, 3 is the vacuum pump, 4 is the oxygen detector, 5 is the hollow spiral tube, 6 is the vibrator, 7 is the filter screen A, 8 is the filter screen exhaust cover, 9 is the carbon dioxide backflush device, 10 is the gas replenishment device, 11 is the double-end mechanical seal, 12 is the filter screen B, 13 is the partition a1, 14 is the partition a2, 15 is the spring k1, 16 is the spring k2, and 17 is the backflush air hole. Detailed Implementation

[0035] like Figure 1 and Figure 2 A sealed control system for a solid amine desorption device, used for carbon dioxide desorption of solid amines adsorbed with carbon dioxide, comprising:

[0036] Feed hopper 1 is used to buffer solid amines that have adsorbed carbon dioxide and is connected to the feed inlet;

[0037] The vacuum desorption device 2 has two hollow spiral tubes 5 inside, which are arranged horizontally and vertically in the cavity of the vacuum desorption device 2. The two ends of the two hollow spiral tubes 5 on one side of the vacuum desorption device 2 extend out of the cavity of the vacuum desorption device 2 and are respectively connected to a connecting pipe through a rotary joint.

[0038] The other ends of the two hollow spiral tubes 5 extend to the other side of the vacuum desorption device 2 cavity. Water vapor is passed through the other end of one hollow spiral tube 5, and water vapor is discharged from the other end of the other hollow spiral tube 5.

[0039] The motor's drive shaft is connected to two hollow spiral tubes 5 via a gear transmission assembly, enabling the two hollow spiral tubes 5 to rotate along their own axes.

[0040] The hollow spiral tube 5 has double-end mechanical seals at both ends of its shaft 11.

[0041] Vacuum pump 3, installed on the exhaust pipe, is used to evacuate the vacuum desorption device 2;

[0042] The oxygen detector 4 is installed on the exhaust pipe, behind the vacuum pump. The controller input is connected to the oxygen detector 4, and the controller output is connected to the vacuum pump 3.

[0043] The vacuum desorption device 2 is equipped with two exhaust ports and an internal filter exhaust cover 8. Both exhaust ports are connected to the vacuum pump 3 and the carbon dioxide backflushing device 9. When performing carbon dioxide desorption of solid amines, one exhaust port opens the valve connected to the vacuum pump 3, and the other opens the valve connected to the carbon dioxide backflushing device 9.

[0044] The vacuum desorption device 2 is equipped with a filter A7 with a filtration accuracy of 10μm. The filter A7 covers the hollow spiral tube 5, separating it from the exhaust port. A vibrator 6 is provided at the edge of the filter A7 and connected to the inner wall of the vacuum desorption device 2. The filter A7 has a pointed top structure.

[0045] The filter exhaust cover 8 has a double-layer cylindrical structure. The inner cylinder is equipped with ten layers of filter screens B with a filtration accuracy of 5μm. The outer cylinder is a metal shell with multiple backflush holes 17 distributed on the shell for introducing carbon dioxide gas.

[0046] The bottom of the filter exhaust cover 8 is provided with two semi-circular partitions a113 and a214 that can be opened downwards. The partition a113 is supported by a spring k115, and the partition a214 is supported by a spring k216.

[0047] When there is no powder on partitions a113 and a214, the bottom of the inner cylinder remains sealed. As more powder falls onto the partitions, they open downwards under gravity, allowing all the fine powder to flow out. Springs k115 and k216 then return to their original positions, and the internal split partitions close. Example

[0048] The difference between this embodiment and Embodiment 1 is that it also includes a gas replenishment device 10, which is connected to the vacuum desorption device 2. If the oxygen concentration monitor 4 detects oxygen, it controls the vacuum pump 3 to stop and turns on the gas replenishment device 10 to replenish nitrogen into the device. The vacuum desorption device 2 is under a slight positive pressure to prevent further oxygen leakage.

Claims

1. A sealed control system for a solid amine desorption device, used for carbon dioxide desorption of solid amine adsorbed with carbon dioxide, characterized in that, include: Vacuum desorption equipment (2) has a cavity, one side of which is connected to a feed pipe; Two hollow spiral tubes (5) are arranged horizontally and vertically in the cavity of the vacuum desorption device (2). The two shaft ends of the two hollow spiral tubes (5) on one side of the vacuum desorption device (2) extend out of the cavity of the vacuum desorption device (2) and are connected to a connecting pipe through a rotary joint respectively. The other ends of the two hollow spiral tubes (5) extend out to the other side of the cavity of the vacuum desorption device (2); A double-end mechanical seal (11) is provided between the shaft end of the hollow spiral tube (5) and the cavity wall of the vacuum desorption device (2). The motor's drive shaft is connected to two hollow spiral tubes (5) via a gear transmission assembly, so that the two hollow spiral tubes (5) can rotate along their own axes; The top of the cavity of the vacuum desorption device (2) is provided with multiple exhaust ports, each exhaust port is connected to an exhaust branch pipe, the multiple exhaust branch pipes are connected to an exhaust main pipe, and a vacuum pump (3) is connected to the exhaust main pipe. An oxygen detector (4) is connected to the exhaust manifold and located behind the vacuum pump (3); The controller has its signal input terminal connected to the oxygen detector (4) and its signal output terminal connected to the vacuum pump (3).

2. The sealing control system of the solid amine desorption equipment according to claim 1, characterized in that, The vacuum desorption device (2) has a filter exhaust cover (8) at the top of its cavity. The top opening of the filter exhaust cover (8) is connected to the exhaust branch pipe, and the side opening is connected to the carbon dioxide backflushing device (9).

3. The sealing control system of the solid amine desorption device according to claim 1, characterized in that, The vacuum desorption device (2) has a filter screen A (7) located above the hollow spiral tube (5) inside the cavity. The filter screen A (7) has a pointed structure that can cover the hollow spiral tube (5) and separate it from the exhaust port.

4. The sealing control system of the solid amine desorption device according to claim 3, characterized in that, A vibrator (6) is provided at the connection between the edge of the filter screen A (7) and the inner wall of the vacuum desorption device (2).

5. The sealing control system of the solid amine desorption device according to claim 2, characterized in that, The filter exhaust cover (8) has a double-layer structure. The inner layer is equipped with filter B (12), and the outer layer is the exhaust cover shell. Multiple backflush holes (17) are distributed on the exhaust cover shell for introducing backflush gas.

6. The sealing control system of the solid amine desorption device according to claim 5, characterized in that, The filter screen B (12) is multi-layered, with a filtration accuracy of 1 to 5 μm.

7. The sealing control system of the solid amine desorption device according to claim 5, characterized in that, The bottom of the filter exhaust cover (8) is provided with a split partition that can be opened downwards. The split partition includes a partition a1 (13) and a partition a2 (14). A support spring is provided between the bottom of the split partition and the exhaust cover shell.

8. The sealing control system of the solid amine desorption device according to claim 1, characterized in that, It also includes a gas replenishment device (10), which is connected to the cavity of the vacuum desorption device (2) and is used to replenish inert gas or carbon dioxide into the cavity of the vacuum desorption device (2). The signal output terminal of the controller is connected to the gas replenishment device (10).

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