A pressure relief device and a pressure regulation system for a drying tower

Abstract

This invention discloses a pressure relief device and a drying tower pressure control system, connected to a drying tower. The drying tower has a pressure relief hole on its side wall. The system includes a sealing assembly and a sliding assembly. The sealing assembly includes a sealing element and a rotating element. The sealing element is positioned relative to the pressure relief hole and can be engaged with it to seal the pressure relief hole. The rotating element is connected to the sealing element and rotatably connected to the drying tower, used to drive the sealing element to engage with the pressure relief hole. The sliding assembly includes a push rod, one end of which is positioned relative to the sealing element, and the other end is slidably inserted into the pressure relief hole and can abut against the sealing element, used to push the sealing element away from the pressure relief hole to open it. This invention effectively solves the problem that traditional pressure relief devices may not be able to accurately control the pressure inside the spray drying tower, resulting in large pressure fluctuations that affect drying efficiency and product quality.

Description

Technical Field

[0001] This invention relates to the field of drying tower technology, specifically to a pressure relief device and a drying tower pressure regulation system. Background Technology

[0002] Drying towers typically combine centrifugal spray equipment and air pressure spray equipment to improve drying efficiency.

[0003] For example, Chinese utility model patent application number CN201120079655.4, entitled "Pressure Control System for Spray Drying Tower," includes a drying tower with a centrifugal spray device at the top and a discharge port at the bottom connected to a pulse-driven bag filter. A key feature of this device is the presence of a pressure spray device on the side of the drying tower. This pressure spray device produces a coarser particle size in the finished product. By combining the centrifugal spray device and the pressure spray device, a multi-purpose tower can be achieved. These two devices can be used simultaneously or separately. By adjusting the particle size distribution, product diversification can be achieved to meet the needs of users in specific industries. However, traditional pressure relief devices may not be able to accurately control the pressure within the spray drying tower, leading to significant pressure fluctuations that affect drying efficiency and product quality.

[0004] Therefore, there is an urgent need for a pressure relief device and a drying tower pressure control system to solve the problem that traditional pressure relief devices may not be able to accurately control the pressure inside the spray drying tower, resulting in large pressure fluctuations that affect drying effect and product quality. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a pressure relief device and a drying tower pressure regulation system to solve the technical problem in the prior art that the traditional pressure relief device may not be able to accurately control the pressure in the spray drying tower, resulting in large pressure fluctuations, which in turn affects the drying effect and product quality.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a pressure relief device connected to a drying tower, wherein the drying tower has a pressure relief hole on its side wall, comprising:

[0008] A sealing assembly includes a sealing element and a rotating element. The sealing element is positioned relative to the pressure relief hole and can be engaged with the pressure relief hole to seal it. The rotating element is connected to the sealing element and rotatably connected to the drying tower, used to drive the sealing element to engage with the pressure relief hole.

[0009] The sliding assembly includes a push rod, one end of which is disposed relative to the sealing member and can abut against the sealing member, and the other end of which is slidably connected to the drying tower for pushing the sealing member to engage with the pressure relief hole.

[0010] In some embodiments, the sealing element includes a sealing block externally placed in the drying tower and in the shape of a frustum, wherein the cross-sectional area of ​​the sealing block gradually decreases along the direction close to the pressure relief hole.

[0011] In some embodiments, the sealing member further includes a sealing portion, which is annular and elastic, and is fitted onto the sealing block and can abut against the circumferential inner wall of the pressure relief hole.

[0012] In some embodiments, the outer wall of the drying tower is provided with a rotating groove, the rotating component includes a rotating shaft and a connecting plate, the rotating shaft is rotatably embedded in the rotating groove, the connecting plate is connected to the rotating shaft and connected to the sealing block.

[0013] In some embodiments, the connecting plate is L-shaped and has a first segment and a second segment. One end of the first segment is connected to the rotating shaft, the second segment is perpendicular to the first segment, and one end of the second segment is connected to the other end of the first segment and the other end is connected to the sealing block.

[0014] In some embodiments, the sealing assembly further includes an elastic portion, one end of which is connected to the interior of the rotating groove and the other end of which is connected to the rotating shaft, for providing an elastic restoring force to drive the rotating shaft and the sealing block to rotate and then reset.

[0015] In some embodiments, the cross-sectional area of ​​the connecting plate is greater than the maximum cross-sectional area of ​​the sealing block.

[0016] In some embodiments, one end of the push rod is disposed opposite to the pressure relief hole, and the sliding assembly further includes a linear drive portion having a fixed end and an extended end. The fixed end of the linear drive portion is connected to the outer wall of the drying tower, and the extended end is connected to the other end of the push rod, for pushing the push rod to slide closer to or away from the sealing block.

[0017] Secondly, the present invention also provides a drying tower pressure regulation system, including a drying tower, an atomizer, an airflow pressure sprayer, and a pressure relief device as described in any of the above.

[0018] In some embodiments, the drying tower pressure control system further includes a baghouse, two first pressure sensors, a blower, a second pressure sensor, and an induced draft fan. The interior of the baghouse is connected to the interior of the drying tower. The two first pressure sensors are respectively built into the drying tower and the baghouse. The outlet of the blower is connected to the interior of the drying tower. The second pressure sensor is located at the outlet of the airflow pressure sprayer. The outlet of the induced draft fan is connected to the interior of the baghouse.

[0019] Compared with the prior art, the beneficial effects of the pressure relief device provided by the present invention include: the sealing member is set relative to the pressure relief hole on the side wall of the drying tower and can be engaged with the pressure relief hole to seal the pressure relief hole; the rotating member is connected to the sealing member and can rotate relative to the drying tower; the rotated member can drive the sealing member to be engaged in the pressure relief hole; the push rod is set relative to the sealing member and slidably connected to the drying tower; the slidable push rod can move close to the sealing member and abut against the sealing member to push the sealing member to be engaged in the pressure relief hole. Compared to existing technologies, this new technology utilizes pressure relief holes on the side wall of the drying tower. These holes are opened and closed by a sealing element that engages with them. When there is negative pressure inside the drying tower, external pressure acts on the sealing block, causing it and the rotating shaft to rotate relative to the drying tower. This locks the sealing block into the pressure relief hole, preventing pressure leakage. When there is positive pressure inside the drying tower, the pressure relief element slides towards the sealing block and presses against it, locking the sealing block into the pressure relief hole. This counteracts the pressure difference, creating a thrust that seals the area. When pressure relief is needed, the push rod separates from the sealing block, and the pressure relief hole automatically opens. This allows for rapid pressure relief within the drying tower, solving the technical problem in existing technologies where traditional pressure relief devices may not accurately control the pressure inside the spray drying tower, leading to large pressure fluctuations that affect drying efficiency and product quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a pressure relief device and a drying tower pressure control system provided in an embodiment of the present invention;

[0021] Figure 2 It is along Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a cross-sectional structural diagram of a pressure relief device connected to a drying tower according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] Drying tower 1;

[0025] Blocking component 2;

[0026] Sealing component 21;

[0027] Block 211;

[0028] Sealing part 212;

[0029] Rotating component 22;

[0030] Rotating shaft 221;

[0031] Connecting plate 222;

[0032] Elastic part 23;

[0033] Sliding component 3;

[0034] Putter 31;

[0035] Linear drive unit 32;

[0036] Atomizer 4;

[0037] 5. Airflow pressure sprayer;

[0038] Bag compartment 6;

[0039] First pressure sensor 7;

[0040] 8 blowers;

[0041] Second pressure sensor 9;

[0042] 10 induced draft fans. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0044] To address the technical problem in existing technologies where traditional pressure relief devices may not be able to accurately control the pressure inside the spray drying tower, resulting in large pressure fluctuations that affect drying efficiency and product quality, this invention provides a pressure relief device that can achieve sealing and rapid pressure relief within the drying tower, enabling a rapid response to pressure changes within the drying tower.

[0045] It should be noted that the pressure relief device of the present invention is used in, but not limited to, the field of drying tower technology. For ease of explanation, this invention will only use the application of the pressure relief device in the field of drying tower technology as an example. The principle of the pressure relief device in other types of equipment is essentially the same as that in the field of drying tower technology, and will not be described in detail here.

[0046] Please see Figures 1 to 3 , Figure 2 , Figure 3This is a schematic diagram of a pressure relief device in one embodiment of the present invention. A pressure relief device is connected to a drying tower 1. The drying tower 1 has a pressure relief hole on its side wall. The device includes a sealing component 2 and a sliding component 3. The sealing component 2 includes a sealing member 21 and a rotating member 22. The sealing member 21 is disposed opposite to the pressure relief hole and can be engaged with the pressure relief hole to seal it. The rotating member 22 is connected to the sealing member 21 and is rotatably connected to the drying tower 1 to drive the sealing member 21 to be engaged with the pressure relief hole. The sliding component 3 includes a push rod 31. One end of the push rod 31 is disposed opposite to the sealing member 21, and the other end is slidably inserted into the pressure relief hole and can abut against the sealing member 21 to push the sealing member 21 away from the pressure relief hole to open the pressure relief hole.

[0047] In this device, the sealing member 21 is positioned relative to the pressure relief hole on the side wall of the drying tower 1 and can engage with the pressure relief hole to seal it. The rotating member 22 is connected to the sealing member 21 and can rotate relative to the drying tower 1. After rotation, the rotating member 22 can drive the sealing member 21 to engage with the pressure relief hole. The push rod 31 is positioned relative to the sealing member 21 and is slidably connected to the drying tower 1. After sliding, the push rod 31 can move close to the sealing member 21 and abut against the sealing member 21 to push the sealing member 21 to engage with the pressure relief hole.

[0048] Compared to existing technologies, this new technology opens and closes pressure relief holes by creating pressure relief holes on the side wall of the drying tower 1 and engaging the sealing element 21 with the pressure relief holes. When there is negative pressure inside the drying tower 1, external pressure acts on the sealing block 211, which pushes the sealing block 211 and the rotating shaft 221 to rotate relative to the drying tower 1, causing the sealing block 211 to be engaged in the pressure relief hole, preventing pressure leakage. When there is positive pressure inside the drying tower 1, the pusher slides close to the sealing block 211 and abuts against it, causing the sealing block 211 to be engaged in the pressure relief hole, offsetting the pressure difference between the inside and outside to form a thrust, thus achieving a sealing effect. When pressure relief is needed, the push rod 31 separates from the sealing block 211, and the pressure relief hole opens automatically, enabling rapid pressure relief inside the drying tower 1. This solves the technical problem in existing technologies where traditional pressure relief devices may not be able to accurately control the pressure inside the spray drying tower 1, resulting in large pressure fluctuations that affect drying effect and product quality.

[0049] In this embodiment, as Figure 2 , Figure 3 As shown, the sealing component 21 includes a sealing block 211 and a sealing part 212.

[0050] In one embodiment, please refer to Figures 1 to 3 The sealing block 211 is placed outside the drying tower 1 and is in the shape of a frustum, and the cross-sectional area of ​​the sealing block 211 gradually decreases along the direction close to the pressure relief hole.

[0051] The sealing block 211 is positioned relative to the pressure relief hole and is in the shape of a frustum, so that the sealing block 211 can be locked in the pressure relief hole, which can enhance the airtightness between the sealing block 211 and the pressure relief hole and ensure the pressure stability inside the drying tower 1.

[0052] One implementation method is, for example Figure 3 As shown, the sealing part 212 is annular and elastic. The sealing part 212 is sleeved on the sealing block 211 and can abut against the circumferential inner wall of the pressure relief hole.

[0053] The sealing part 212 is disposed between the sealing block 211 and the pressure relief hole to enhance the airtightness of the engagement between the sealing block 211 and the pressure relief hole.

[0054] Specifically, an annular groove is provided on the circumferential side wall of the sealing block 211, and the sealing part 212 is a rubber sealing ring that is common and easy to purchase on the market. The sealing part 212 is fitted into the annular groove and abuts against the inner wall of the pressure relief hole. The rubber sealing ring here is a conventional setting known to those skilled in the art, and will not be described in detail.

[0055] In this embodiment, as Figure 3 As shown, the outer wall of the drying tower 1 is provided with a rotating groove. The rotating component 22 includes a rotating shaft 221 and a connecting plate 222. The rotating shaft 221 is rotatably embedded in the rotating groove, and the connecting plate 222 is connected to the rotating shaft 221 and connected to the sealing block 211.

[0056] The rotating shaft 221 and the sealing block 211 are connected by a connecting plate 222 to form a stable support structure.

[0057] In one embodiment, the cross-sectional area of ​​the connecting plate 222 is greater than the maximum cross-sectional area of ​​the sealing block 211.

[0058] The cross-sectional area of ​​the connecting plate 222 is larger than the maximum cross-sectional area of ​​the sealing block 211, so that the pressure inside the drying tower 1 acts on the connecting plate 222, which can generate pressure to push the sealing block 211 to lock with the pressure relief hole.

[0059] One implementation method is, for example Figure 3 As shown, the connecting plate 222 is L-shaped and has a first segment and a second segment. One end of the first segment is connected to the rotating shaft 221, and the second segment is set perpendicular to the first segment. One end of the second segment is connected to the other end of the first segment, and the other end is connected to the sealing block 211.

[0060] The L-shaped connecting plate 222 can provide support and avoid interference between the rotation of the sealing block 211 and the inner wall of the drying tower 1.

[0061] In one embodiment, please refer to Figure 3The sealing assembly 2 also includes an elastic part 23, one end of which is connected to the inside of the rotating groove and the other end is connected to the rotating shaft 221, for providing elastic restoring force to reset the rotating shaft 221 and the sealing block 211 after rotation.

[0062] The elastic part 23 provides elastic restoring force to the rotating shaft 221, enabling the sealing block 211 to be sealed and engaged with the pressure relief hole, thereby improving airtightness.

[0063] In this embodiment, as Figure 3 As shown, one end of the push rod 31 is positioned relative to the pressure relief hole. The sliding assembly 3 also includes a linear drive part 32, which has a fixed end and an extended end. The fixed end of the linear drive part 32 is connected to the outer wall of the drying tower 1, and the extended end is connected to the other end of the push rod 31, which is used to push the push rod 31 to slide closer to or further away from the sealing block 211.

[0064] The linear drive unit 32 can drive the push rod 31 to slide relative to the drying tower 1.

[0065] Furthermore, the linear drive unit 32 here is a cylinder, hydraulic cylinder and push rod 31 motor that are common and easy to purchase on the market. The linear drive unit 32 here is a conventional configuration known to those skilled in the art, and will not be described in detail.

[0066] The present invention also provides a pressure control system for a drying tower 1, including a drying tower 1, an atomizer 4, an airflow pressure sprayer 5, and the pressure relief device described above.

[0067] By combining an atomizer 4 and a pressure sprayer 5 within the drying tower 1, a multi-purpose tower is achieved. By adjusting the particle size distribution, product diversification is possible to meet the needs of users in specific industries. This invention primarily utilizes airflow pressure and centrifugal spraying in the spray drying process to achieve particle size diversification and improve the compatibility of various products.

[0068] In this embodiment, the pressure control system of the drying tower 1 also includes a baghouse 6, two first pressure sensors 7, a blower 8, a second pressure sensor 9, and an induced draft fan 10. The interior of the baghouse 6 is connected to the interior of the drying tower 1. The two first pressure sensors 7 are respectively built into the drying tower 1 and the baghouse 6. The air outlet of the blower 8 is connected to the interior of the drying tower 1. The second pressure sensor 9 is located at the air outlet of the airflow pressure sprayer 5. The air outlet of the induced draft fan 10 is connected to the interior of the baghouse 6.

[0069] In operation, positive pressure is first applied to the top of the drying tower 1 using blowers, pumps, and other equipment to create positive pressure inside the tower. Then, high-temperature gas, such as natural gas, is blown into the atomizer 4. At this point, the first pressure sensor 7 transmits the detected positive pressure value to the PLC host computer. Next, a blower 10 and pumps are added to the baghouse 6 to create negative pressure. The negative pressure value is transmitted to the host computer. When the negative pressure exceeds the positive pressure inside the spray tower, the pressure inside the tower will be negative.

[0070] Furthermore, this system also accurately calculates the material movement speed based on the frequency of the atomizer 4 and the weight of the lithium iron phosphate precursor, and indirectly modifies the frequency of the blower and induced draft fan 10 by modifying the material movement speed, thereby realizing the visualized operation of pressure control of the spray drying tower 1.

[0071] Taking the wet milling process for producing lithium iron phosphate precursors as an example, the milled material enters spray drying tower 1:

[0072] Control of negative pressure inside the tower: Based on the frequency of the blower 8, the frequency of the induced draft fan 10 is determined. At the frequency of the induced draft fan 10, pressure sensors are placed near the blower 8 and the induced draft fan 10. The measured pressure values ​​are uploaded to the host computer via PLC. The host computer calculates the frequency of the blower 8 according to the formula of frequency and fan pressure, and feeds it back to the induced draft fan 10, thereby controlling the frequency in real time to achieve the effect of constant negative pressure inside the spray drying tower 1.

[0073] Residence time calculation: Assuming the frequency of atomizer 4 is 40Hz, the negative pressure is -100KPa, and approximately 4265Kg of material can be sprayed per hour, with a tower height of 8.5m, calculations show that without negative pressure, the material will reside in the drying tower 1 (245℃-280℃) for 1.31s. At this temperature, the lithium iron phosphate precursor is prone to oxidation due to its long residence time at high temperatures. A combination of positive and negative pressure accelerates the movement of the material within the drying tower 1. The approximate residence time of the material in the tower is calculated based on the atomizer 4 frequency, tower negative pressure, and tower height using the following formula:

[0074]

[0075] Where f is the frequency of atomizer 4 (Hz), P is the negative pressure inside the tower (KPa), H is the height of drying tower 1 (m), and g is the acceleration due to gravity (usually 9.8m / s2).

[0076] Furthermore, based on the residence time within the tower, the safety factor of the material is determined, providing new process parameters for production and reducing the risk of oxidation under high-temperature conditions. The atomizer's frequency module and the tower pressure sensor are equipped with PLC communication and program writing capabilities. PLC automation program editing allows PLC engineers to write calculation formulas into the calculation formula function block according to requirements, and the results are then linked to the host computer.

[0077] Program control logic: The host computer sets the atomizer 4 frequency and tower negative pressure parameters on the host computer parameter interface and starts the spray tower; the program automatically calculates the corresponding set atomizer 4 frequency and residence time through function blocks; the program returns to the starting point; the results are manually recorded / uploaded to MES.

[0078] Furthermore, the PLC, MES, and host computer in this system are all conventional settings known to those skilled in the art, and will not be described in detail further.

[0079] To better understand this invention, the following is combined with... Figures 1 to 3 The technical solution of the present invention will be described in detail below:

[0080] In the specific working process of this invention, the sealing member 21 is positioned relative to the pressure relief hole on the side wall of the drying tower 1 and can engage with the pressure relief hole to seal it. A rotating member 22 is connected to the sealing member 21 and can rotate relative to the drying tower 1. The rotated member 22 can drive the sealing member 21 to engage with the pressure relief hole. A push rod 31 is positioned relative to the sealing member 21 and slidably connected to the drying tower 1. The slidable push rod 31 can move closer to the sealing member 21 and abut against it, pushing the sealing member 21 to engage with the pressure relief hole. Compared to the prior art, by opening a pressure relief hole on the side wall of the drying tower 1 and engaging the sealing member 21 with the pressure relief hole, the opening and closing of the pressure relief hole can be achieved.

[0081] In practical use, when there is negative pressure inside the drying tower 1, the external pressure acts on the sealing block 211, which can push the sealing block 211 and the rotating shaft 221 to rotate relative to the drying tower 1, and make the sealing block 211 locked in the pressure relief hole to prevent pressure from leaking from the pressure relief hole. When there is positive pressure inside the drying tower 1, the pusher slides close to the sealing block 211 and abuts against the sealing block 211, so that the sealing block 211 is locked in the pressure relief hole, offsetting the pressure difference between the inside and outside to form a thrust, which plays a sealing role. When pressure relief is required, the push rod 31 separates from the sealing block 211, and the pressure relief hole opens automatically, which can realize the rapid pressure relief inside the drying tower 1.

[0082] This device, through the aforementioned structure, can solve the technical problem in the prior art where traditional pressure relief devices may not be able to accurately control the pressure inside the spray drying tower 1, resulting in large pressure fluctuations that affect the drying effect and product quality.

[0083] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A pressure relief device connected to a drying tower, wherein a pressure relief hole is provided on the side wall of the drying tower, characterized in that, include: A sealing assembly includes a sealing component and a rotating component. The sealing component is disposed relative to the pressure relief hole and can be engaged with the pressure relief hole to seal the pressure relief hole. The rotating component is connected to the sealing component and is rotatably connected to the drying tower to drive the sealing component to be engaged with the pressure relief hole. as well as A sliding assembly includes a push rod, one end of which is disposed relative to the sealing member and can abut against the sealing member, and the other end of which is slidably connected to the drying tower for pushing the sealing member to engage with the pressure relief hole; The sealing component includes a sealing block, which is externally placed in the drying tower and is truncated cone-shaped, and the cross-sectional area of ​​the sealing block gradually decreases along the direction close to the pressure relief hole; The outer wall of the drying tower is provided with a rotating groove. The rotating component includes a rotating shaft and a connecting plate. The rotating shaft is rotatably embedded in the rotating groove, and the connecting plate is connected to the rotating shaft and connected to the sealing block. The sealing assembly further includes an elastic part, one end of which is connected to the interior of the rotating groove and the other end is connected to the rotating shaft, for providing an elastic restoring force to drive the rotating shaft and the sealing block to rotate and then reset.

2. The pressure relief device according to claim 1, characterized in that, The sealing component also includes a sealing part, which is annular and elastic. The sealing part is sleeved on the sealing block and can abut against the circumferential inner wall of the pressure relief hole.

3. The pressure relief device according to claim 1, characterized in that, The connecting plate is L-shaped and has a first segment and a second segment. One end of the first segment is connected to the rotating shaft, and the second segment is perpendicular to the first segment. One end of the second segment is connected to the other end of the first segment, and the other end is connected to the sealing block.

4. The pressure relief device according to claim 1, characterized in that, The cross-sectional area of ​​the connecting plate is greater than the maximum cross-sectional area of ​​the sealing block.

5. The pressure relief device according to claim 4, characterized in that, One end of the push rod is positioned relative to the pressure relief hole. The sliding assembly also includes a linear drive unit, which has a fixed end and an extended end. The fixed end of the linear drive unit is connected to the outer wall of the drying tower, and the extended end is connected to the other end of the push rod, for pushing the push rod to slide closer to or away from the sealing block.

6. A pressure control system for a drying tower, characterized in that, It includes a drying tower, an atomizer, a pressure sprayer, and a pressure relief device as described in any one of claims 1-5.

7. The drying tower pressure control system according to claim 6, characterized in that, It also includes a baghouse, two first pressure sensors, a blower, a second pressure sensor, and an induced draft fan. The interior of the baghouse is connected to the interior of the drying tower. The two first pressure sensors are respectively built into the drying tower and the baghouse. The air outlet of the blower is connected to the interior of the drying tower. The second pressure sensor is located at the air outlet of the air pressure sprayer. The air outlet of the induced draft fan is connected to the interior of the baghouse.

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