Formaldehyde production tail gas efficient dehumidification and recycling device

Abstract

The utility model relates to formaldehyde production tail gas treatment technical field discloses a kind of formaldehyde production tail gas efficient dehumidification and recycling device, including shell, rotatingly connected with rotary drum in the shell middle part, servo motor is installed in the shell upper middle part, the servo motor lower side output end is passed through shell shell and is fixedly connected on the rotary drum upper middle part, the rotary drum inside equal interval is equipped with multiple installation grooves, the dry assembly is clamped and connected in the installation groove inside, the shell rear portion both sides are evenly provided with connecting shell.The utility model discloses a kind of formaldehyde production tail gas efficient dehumidification and recycling device, sieve disc depth design is 1~1.5 times of molecular sieve particle diameter, can make molecular sieve in sieve disc inside present single layer flat or micro stack state, maximize molecular sieve and the contact area of formaldehyde tail gas to be dehumidified, avoid the waste problem that bottom layer particle cannot participate in dehumidification due to excessive stacking of particle.

Description

Technical Field

[0001] This utility model relates to the field of formaldehyde production tail gas treatment technology, and in particular to a high-efficiency dehumidification and recycling device for formaldehyde production tail gas. Background Technology

[0002] In the formaldehyde production process, the exhaust gas usually contains a certain amount of moisture. If it is not effectively dehumidified, it will not only affect the efficiency of subsequent recycling of the exhaust gas (such as using it as feed gas to be reused in the reaction system), but may also cause corrosion or blockage of subsequent equipment due to the combination of moisture with other components in the exhaust gas. Therefore, dehumidification is a key process in the formaldehyde production exhaust gas treatment. At present, molecular sieve adsorption is commonly used in industry to achieve exhaust gas dehumidification. Utilizing the excellent selective adsorption performance of molecular sieves, moisture in the exhaust gas can be removed efficiently. Moreover, molecular sieves have regenerative capabilities and can theoretically be recycled and reused, which has certain advantages in terms of cost and environmental protection.

[0003] To achieve higher dehumidification capacity, most devices stack molecular sieves in multiple layers. However, this stacked structure can significantly increase the resistance to exhaust gas flow. When airflow passes through the thick stack of molecular sieves, it must overcome the resistance formed by the narrow gaps between the particles. This not only requires additional energy consumption from power equipment such as fans to drive the exhaust gas flow, but also may lead to problems such as exhaust gas stagnation in some areas and excessively fast airflow in others due to uneven airflow distribution. More importantly, the utilization rate of molecular sieves in the stacked state is extremely low. Due to the resistance, the exhaust gas mainly concentrates on the surface molecular sieves for moisture adsorption, while the middle and deeper molecular sieves cannot make sufficient contact with the exhaust gas, and their adsorption performance cannot be effectively utilized. This results in a large number of molecular sieves being "idle," which not only wastes molecular sieve materials, but also requires frequent shutdowns to replace or regenerate molecular sieves because the surface molecular sieves quickly reach adsorption saturation. This seriously affects the continuous operation efficiency of the device and increases production and maintenance costs. Utility Model Content

[0004] The main objective of this invention is to provide a highly efficient dehumidification and recycling device for formaldehyde production exhaust gas, which can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a formaldehyde production exhaust gas high-efficiency dehumidification and recycling device, comprising an outer shell, a rotating drum rotatably connected to the middle of the outer shell, a servo motor installed in the middle of the upper side of the outer shell, the lower output end of the servo motor penetrating the outer shell wall and fixedly connected to the middle of the upper side of the rotating drum, multiple mounting slots evenly spaced inside the rotating drum, a drying component engaging inside the mounting slots, connecting shells provided on the upper and lower sides of the rear of the outer shell, a drying connecting pipe provided in the middle of the side of the connecting shell away from the outer shell, and dehumidification connecting pipes provided on the upper and lower parts of the left side of the outer shell; The drying assembly includes a drying cylinder, multiple sieve discs, a partition plate, and a sealing cap. The multiple sieve discs are stacked inside the drying cylinder, and molecular sieve particles are laid flat inside each sieve disc. The lower part of the sealing cap is threaded to the upper part of the drying cylinder, and the partition plate is disposed between the uppermost sieve disc and the lower part of the sealing cap.

[0006] Preferably, multiple sealing rings are provided on the upper and lower sides of the drum, and each sealing ring corresponds to a mounting groove. The side of the sealing ring away from the drum is in contact with the inner walls of the upper and lower sides of the outer casing.

[0007] Preferably, one of the drying connecting pipes and one of the dehumidifying connecting pipes are equipped with a temperature and humidity sensor.

[0008] Preferably, the front of the outer casing is provided with inspection ports on the upper and lower sides.

[0009] Preferably, the depth of the sieve disc is 1 to 1.5 times the diameter of the molecular sieve particles.

[0010] Preferably, the inner wall of the sealing cap is provided with multiple handles.

[0011] Compared with the prior art, this utility model has the following beneficial effects: the depth of the sieve disc is designed to be 1 to 1.5 times the diameter of the molecular sieve particles, which allows the molecular sieve to be laid flat in a single layer or in a micro-stacked state in the sieve disc, maximizing the contact area between the molecular sieve and the formaldehyde exhaust gas to be dehumidified, and avoiding the waste problem of the bottom particles not being able to participate in dehumidification due to excessive particle stacking; at the same time, multiple sieve discs of this specification are stacked in the drying cylinder to form a "multi-layer progressive dehumidification" effect, further improving the thoroughness of moisture adsorption in the exhaust gas. This size design makes the molecular sieve particles form a uniform and smooth airflow channel, effectively reducing the flow resistance of the exhaust gas when it flows through the sieve disc. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of a formaldehyde production tail gas high-efficiency dehumidification and recycling device according to the present invention. Figure 2 This is a schematic diagram of the inspection port structure of a formaldehyde production tail gas high-efficiency dehumidification and recycling device according to the present invention. Figure 3 This is a schematic diagram of the rotating drum structure of a formaldehyde production tail gas high-efficiency dehumidification and recycling device according to the present invention; Figure 4 This is a schematic diagram of the drying component structure of a formaldehyde production tail gas high-efficiency dehumidification and recycling device according to the present invention.

[0013] In the diagram: 1. Outer shell; 2. Connecting shell; 3. Drying connecting pipe; 4. Dehumidifying connecting pipe; 5. Inspection port; 6. Servo motor; 7. Rotary drum; 8. Mounting slot; 9. Drying assembly; 901. Drying cylinder; 902. Sieve tray; 903. Isolation plate; 904. Sealing cover; Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] like Figure 1-4 As shown, a formaldehyde production exhaust gas high-efficiency dehumidification and recycling device includes a shell 1, a drum 7 rotatably connected to the middle of the shell 1, a servo motor 6 installed on the upper middle of the shell 1, the lower output end of the servo motor 6 penetrating the shell 1 wall and fixedly connected to the upper middle of the drum 7, multiple mounting slots 8 evenly spaced inside the drum 7, and drying components 9 engaging inside the mounting slots 8, connecting shells 2 on the upper and lower sides of the rear of the shell 1, a drying connecting pipe 3 on the middle of the side of the connecting shell 2 away from the shell 1, and dehumidification connecting pipes 4 on the upper and lower parts of the left side of the shell 1; the device uses the shell 1 as the overall load-bearing and protective frame, and its core transmission component is the drum 7 rotatably connected in the middle (the drum 7 is supported by thermal insulation material), the rotation power of the drum 7 is provided by the servo motor 6 installed on the upper middle of the shell 1—the lower output end of the servo motor 6 penetrates the shell 1. 1. The outer shell is fixedly connected to the upper middle part of the drum 7, which can drive the drum 7 to rotate precisely to a specified angle. To realize the modular installation and switching of the dehumidification components, multiple installation slots 8 are equally spaced inside the drum 7. Each installation slot 8 is equipped with a drying component 9 by a snap-fit ​​connection. The snap-fit ​​structure facilitates the subsequent disassembly, maintenance or replacement of the drying component 9. In addition, connecting shells 2 are respectively set on the upper and lower sides of the rear of the outer shell 1. The middle part of the side of the connecting shell 2 away from the outer shell 1 is connected to the drying connecting pipe 3. The two together form the inlet and outlet channel of the hot air required for molecular sieve regeneration or the outlet channel of the dried tail gas. The upper and lower parts of the left side of the outer shell 1 are equipped with dehumidification connecting pipes 4, which serve as the inlet channel for the formaldehyde production tail gas to be dehumidified and the temporary storage / transport channel for the dehumidified tail gas. The overall structure realizes the cycle operation of tail gas dehumidification and drying component regeneration through the coordinated cooperation of various components.

[0016] The drying assembly 9 includes a drying cylinder 901, multiple sieve discs 902, an isolation plate 903, and a sealing cap 904. Multiple sieve discs 902 are stacked inside the drying cylinder 901, with molecular sieve particles evenly distributed inside each disc. The lower part of the sealing cap 904 is threaded to the upper part of the drying cylinder 901. The isolation plate 903 is positioned between the uppermost sieve disc 902 and the lower part of the sealing cap 904. The drying assembly 9 serves as the core execution unit for dehumidifying the exhaust gas. Based on the drying cylinder 901, it forms a support frame, providing stable installation space for internal components. Multiple sieve discs 902 are stacked axially inside, with molecular sieve particles evenly distributed within each disc. This even distribution design maximizes the contact area between the molecular sieve and the exhaust gas. Combined with the stacked disc structure, this extends the residence time of the exhaust gas within the assembly, thereby improving dehumidification efficiency. When the molecular sieve is replaced, the sealing cap 904 can be unscrewed, and the isolation plate 903 and each sieve disc 902 can be removed to process the molecular sieve, enabling the assembly to be recycled and reused.

[0017] Multiple sealing rings are provided on the upper and lower sides of the drum 7, and each sealing ring corresponds to a mounting groove 8. The side of the sealing ring away from the drum 7 is in contact with the inner walls of the upper and lower sides of the outer shell 1. On the upper and lower sides of the drum 7, a sealing ring is provided for each mounting groove 8, forming a configuration structure in which "the sealing ring corresponds to the mounting groove 8". The side of all sealing rings away from the drum 7 is in close contact with the inner walls of the upper and lower sides of the outer shell 1, forming a sealing interface between the drum 7 and the outer shell 1. When the drum 7 rotates under the drive of the servo motor 6 and the drying components 9 in different mounting grooves 8 are connected to the dehumidification connecting pipe 4 or the connecting shell 2 respectively, the sealing rings can always fit against the inner wall of the outer shell 1, creating an independent sealing space for each mounting groove 8. This prevents the formaldehyde exhaust gas to be dehumidified from leaking from the gap between the drum 7 and the outer shell 1, and also prevents the hot air used for regeneration from entering other non-working mounting grooves 8, ensuring that the exhaust gas dehumidification channel and the hot air regeneration channel do not interfere with each other.

[0018] One of the drying connection pipes 3 and one of the dehumidifying connection pipes 4 are equipped with temperature and humidity sensors. In the core piping system of the device, the temperature and humidity sensors are respectively mounted on "one of the drying connection pipes 3" and "one of the dehumidifying connection pipes 4". Together, they form the core unit for monitoring the operating conditions of the device, providing real-time data support for the precise control of formaldehyde exhaust gas dehumidification operation and drying component 9 regeneration operation.

[0019] The outer shell 1 has inspection ports 5 on the upper and lower sides of the front. The depth of the sieve plate 902 is 1 to 1.5 times the diameter of the molecular sieve particles. The inner wall of the sealing cover 904 is equipped with multiple handles, which can force the molecular sieve particles to be in a "single-layer flat or micro-stacked" state in the sieve plate 902. When the molecular sieve particles are in a single-layer or micro-stacked state in the sieve plate 902, a uniform and smooth airflow channel will be formed between the particles. The exhaust gas can pass through the sieve plate 902 smoothly without having to overcome the squeezing resistance of multiple layers of particles.

[0020] Working principle: The exhaust gas is pretreated by a pretreatment device (e.g., cooling, removing particulate impurities, etc., to reduce the impact of other factors on dehumidification). The pretreated exhaust gas enters the device through one of the dehumidification connection pipes 4. The exhaust gas is directly introduced into the mounting groove 8 inside the outer shell 1, which is aligned with the dehumidification connection pipe 4. The drying component 9, which is engaged inside the mounting groove 8, uses its internal molecular sieve to further dehumidify the exhaust gas efficiently. A temperature and humidity sensor installed on the other dehumidification connection pipe 4 detects the temperature and humidity of the exhaust gas after dehumidification by the molecular sieve in real time to determine the dehumidification effect. At the same time, one of the drying connection pipes 3 is connected to the hot air supply end, and the temperature and humidity sensor on the other drying connection pipe 3 monitors the gas state during the molecular sieve regeneration process. When it is detected that the current dehumidification capacity of the drying component 9 has decreased ( When the molecular sieve is close to moisture saturation, the servo motor 6 is driven, which drives the drum 7 fixedly connected to it to rotate a certain angle, so that the installation slot 8 where the spare and dried drying component 9 is located is aligned with the dehumidification connection pipe 4 that introduces the exhaust gas, and the exhaust gas dehumidification continues. Meanwhile, the installation slot 8 where the previously moisture-saturated drying component 9 is located rotates with the drum 7 to the position corresponding to the connecting shell 2. At this time, the drying connection pipe 3 connected to the hot air delivers hot air, which enters the installation slot 8 through the connecting shell 2 to heat the molecular sieve and realize the regeneration of the molecular sieve. During this period, the sealing rings on the upper and lower sides of the drum 7, which correspond one-to-one with the installation slots 8, have the characteristics of high temperature resistance, corrosion resistance, and wear resistance, and seal the upper and lower ends of each installation slot 8 to prevent exhaust gas or hot air leakage and ensure the stable operation of the device.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency dehumidification and recycling device for formaldehyde production tail gas, comprising a shell (1), characterized in that: A rotating drum (7) is rotatably connected to the middle of the outer shell (1). A servo motor (6) is installed in the middle of the upper side of the outer shell (1). The lower output end of the servo motor (6) passes through the wall shell of the outer shell (1) and is fixedly connected to the middle of the upper side of the rotating drum (7). Multiple mounting slots (8) are evenly spaced inside the rotating drum (7). A drying component (9) is engaged inside the mounting slot (8). A connecting shell (2) is provided on both the upper and lower sides of the rear of the outer shell (1). A drying connecting pipe (3) is provided in the middle of the side of the connecting shell (2) away from the outer shell (1). A dehumidifying connecting pipe (4) is provided on the upper and lower parts of the left side of the outer shell (1). The drying assembly (9) includes a drying cylinder (901), multiple sieve discs (902), a partition plate (903), and a sealing cap (904). The multiple sieve discs (902) are stacked inside the drying cylinder (901), and molecular sieve particles are laid flat inside each sieve disc (902). The lower part of the sealing cap (904) is threaded to the upper part of the drying cylinder (901). The partition plate (903) is disposed between the uppermost sieve disc (902) and the lower part of the sealing cap (904).

2. The formaldehyde production tail gas high-efficiency dehumidification and recycling device according to claim 1, characterized in that: Multiple sealing rings are provided on the upper and lower sides of the drum (7), and the sealing rings correspond one-to-one with the mounting grooves (8). The side of the sealing ring away from the drum (7) is in contact with the inner walls of the upper and lower sides of the outer shell (1).

3. The formaldehyde production tail gas high-efficiency dehumidification and recycling device according to claim 1, characterized in that: One of the drying connecting pipes (3) and one of the dehumidifying connecting pipes (4) are equipped with temperature and humidity sensors.

4. The formaldehyde production tail gas high-efficiency dehumidification and recycling device according to claim 1, characterized in that: The outer casing (1) has inspection ports (5) on the upper and lower sides of the front.

5. The formaldehyde production tail gas high-efficiency dehumidification and recycling device according to claim 1, characterized in that: The depth of the sieve disc (902) is 1 to 1.5 times the diameter of the molecular sieve particles.

6. The formaldehyde production tail gas high-efficiency dehumidification and recycling device according to claim 1, characterized in that: The inner wall of the sealing cap (904) is provided with multiple handles.

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