A fish slurry concentration device and its concentration process

Abstract

This invention relates to a fish slurry concentration device and its concentration process, belonging to the field of fish slurry concentration technology. It overcomes the shortcomings of traditional flange-sealing ring structures by employing a quick-release sealing assembly. This assembly, through the coordinated design of a vertical sliding part, a rotating part, a conical sealing part, and a roller guide part, achieves a self-locking seal by automatically rotating horizontally to fit against the inner wall of the pipe after vertical insertion, eliminating the need for bolt fastening. The self-locking mechanism uses the radial force component of the conical sealing part to apply pressure evenly, avoiding leakage caused by uneven preload. The roller guide part converts sliding friction into rolling friction, reducing disassembly resistance and minimizing damage to the sealing surface. The combination design of the trapezoidal sealing ring and the elastic ring can adapt to high-temperature expansion and corrosive environments, mitigating the effects of particle erosion and thermal stress, eliminating the risk of damage to the sealing surface from repeated disassembly, and simplifying the operation process.

Description

Technical Field

[0001] This invention belongs to the field of fish sol concentration technology, specifically relating to a fish sol concentration device and its concentration process. Background Technology

[0002] Current fish slurry thickening equipment requires frequent disassembly of pipelines for cleaning and maintenance due to the high viscosity and solid content of the material. Because of the ongoing maintenance, cleaning, and disassembly involved, the sealing of current fish slurry thickening equipment often uses a flange-sealing ring structure. However, this structure has several drawbacks: First, the rubber sealing ring is in prolonged contact with organic acids, salts, and particulate matter in the fish slurry, making it prone to swelling, embrittlement, or wear failure, especially under high-temperature conditions. Second, the flange bolts rely on repeated manual tightening, and uneven pre-tightening force or misalignment of the sealing surface during disassembly and reassembly can easily cause micro-leakage. Furthermore, the flange-sealing ring structure is time-consuming to disassemble, and residual slurry can solidify and form scale on the sealing surface, further increasing the risk of seal failure and severely restricting the continuous operation efficiency of the equipment.

[0003] To address the aforementioned issues, most existing improvement solutions focus on upgrading sealing materials, such as replacing nitrile rubber with fluororubber or optimizing the structure with snap-fit ​​flanges. However, none of these solutions have overcome the core contradictions of "reliance on bolt fastening" and "repeated disassembly damaging the sealing surface." While snap-fit ​​flanges shorten disassembly time, they can cause localized leaks due to uneven stress. Even with improved corrosion resistance of polymer sealing rings, fatigue cracking caused by frequent compression deformation cannot be avoided. In response, a fish slurry concentration device and its concentration process are proposed. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a fish slurry concentration device and its concentration process, thus resolving the issues raised in the background art.

[0005] The objective of this invention can be achieved through the following technical solution: A fish slurry concentration device, comprising a pretreatment device, an evaporator device, a separation and recovery device, a pipeline valve device, and a control system. The pretreatment device is linearly connected to the evaporator device via the pipeline valve device. The outlet of the evaporator device is connected to the separation and recovery device via a vertical pipeline to complete gas-liquid separation and material recovery. The control system is communicatively connected to the pretreatment device, the evaporator device, the separation and recovery device, and the pipeline valve device, forming a thermally driven continuous concentration closed-loop system. The pipeline valve device has a quick-release sealing assembly inside its pipe body. The quick-release sealing assembly includes a vertical sliding part, a rotating part, a conical sealing part, and a roller guide part disposed on the sealing part. One end of the rotating part is hinged to the vertical sliding part, and the conical sealing part is disposed on the other end of the rotating part. The vertical sliding part slides vertically along the inner wall of the pipe body. The inner wall of the pipe body contacts the roller guide part and drives the roller of the roller guide part to slide horizontally. The roller, through linkage, causes the rotating part to rotate around the hinge point, driving the side wall of the conical sealing part to rotate and fit against the inner wall of the pipe to form a self-locking seal, achieving zero leakage.

[0006] As a further embodiment of the present invention, a support block is provided on the pipe body, and the vertical sliding part is a sliding block, which slides through the support block into the pipe body.

[0007] As a further embodiment of the present invention, the support block is provided with a circular hole that communicates with the pipe body, and a trapezoidal sealing ring is fitted on the sliding block. The bottom of the trapezoidal sealing ring is fixedly mounted on the sliding block, and the top of the trapezoidal sealing ring is in contact with the side wall of the circular hole.

[0008] As a further embodiment of the present invention, the connection between the waist and the top of the trapezoidal sealing ring is an arc-shaped structure.

[0009] As a further embodiment of the present invention, the guide part is a guide rod, a vertical guide rail is provided on the circular hole, a guide block is provided on the top of the trapezoidal sealing ring, and the guide block slides along the vertical guide rail.

[0010] As a further embodiment of the present invention, the rotating part is a swing rod, and the angle between the swing rod and the vertical direction of the sliding block is 10°-15°.

[0011] As a further embodiment of the present invention, the conical sealing part includes a frustum-shaped protrusion, the swing rod is connected to the center of the bottom surface of the frustum-shaped protrusion, and the diameter of the pipe body is larger than the top surface diameter of the frustum-shaped protrusion and smaller than the bottom surface diameter of the frustum-shaped protrusion.

[0012] As a further embodiment of the present invention, an elastic ring is fitted onto the frustum-shaped protrusion.

[0013] As a further embodiment of the present invention, the roller guide includes a quadrilateral fixing plate disposed on the top surface of the frustum-shaped protrusion and rollers respectively disposed on the two apex corners of the quadrilateral fixing plate away from the frustum-shaped protrusion. The two rollers are the same size and are detachably slidably connected to the inner wall of the pipe body.

[0014] A fish slurry concentration process includes the following steps:

[0015] S1: Pre-treatment of fish slurry. The raw fish slurry is fed into the pre-treatment device, and solid impurities with a particle size greater than 1mm are removed by a vibrating screen. It is then preheated to 50-70℃ by a plate heat exchanger and homogenized by a homogenizing pump.

[0016] S2: Evaporation and concentration. The pretreated fish slurry is transported to the heating chamber of the evaporator device. Saturated steam is introduced through the outer wall of the falling film heat exchange tube bundle for heating, so that the fish slurry evaporates water in the separation chamber to form concentrated liquid and secondary steam.

[0017] S3: Gas-liquid separation and recovery. Secondary steam from the top of the separation chamber is introduced into a cyclone separator through a vertical pipe for gas-liquid separation. After capturing entrained droplets, volatile organic compounds are recovered through a condenser, and the system vacuum is maintained at -0.08 to -0.06 MPa by a vacuum pump.

[0018] S4: Sealing operation and maintenance. The quick-release sealing assembly of the pipeline valve device enables quick disassembly and sealing of the pipeline connection. During disassembly, the vertical sliding part slides along the inner wall of the pipeline body, driving the roller guide part to move horizontally, causing the conical sealing part to disengage from the inner wall of the pipeline and release the self-locking. During installation, the sliding block is pushed in the opposite direction, and the roller guide part is linked to the conical sealing part to rotate and fit against the inner wall of the pipeline, forming a zero-leakage seal.

[0019] S5: Control and Circulation. The PLC controller of the control system monitors the evaporator temperature and system pressure in real time, adjusts the opening of the steam valve to stabilize the evaporation temperature within the set value range, and recovers the condensate to the boiler for recycling. The concentrated fish slurry is mixed evenly in the stirring tank before being output.

[0020] The beneficial effects of this invention are as follows:

[0021] The use of a quick-release sealing assembly solves the defects of the traditional flange-sealing ring structure. This assembly achieves a self-locking seal by automatically rotating horizontally to fit the inner wall of the pipe after vertical insertion through the linkage design of the vertical sliding part, rotating part, conical sealing part and roller guide part. It eliminates the bolt fastening method. The self-locking mechanism applies pressure evenly through the radial component of the conical sealing part, avoiding leakage caused by uneven preload. The roller guide part converts sliding friction into rolling friction, reducing disassembly resistance and minimizing damage to the sealing surface. The combination design of the trapezoidal sealing ring and elastic ring can adapt to high temperature expansion and corrosive environments, alleviate the effects of particle erosion and thermal stress, eliminate the risk of damage to the sealing surface from repeated disassembly, and simplify the operation process. Attached Figure Description

[0022] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the quick-release sealing assembly structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the roller guide section of the present invention;

[0026] Figure 4 This is a schematic diagram of the trapezoidal sealing ring structure of the present invention;

[0027] Figure 5 This is a flow chart of the fish sol concentration process of the present invention.

[0028] Explanation of key component symbols:

[0029] In the figure: 1. Quick-release sealing assembly; 11. Vertical sliding part; 12. Rotating part; 13. Conical sealing part; 14. Roller guide part; 141. Quadrilateral fixing plate; 142. Roller; 2. Pipe body; 3. Trapezoidal sealing ring; 4. Guide block. Detailed Implementation

[0030] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0031] Please see Figure 1 - Figure 5This embodiment provides a fish slurry concentration device, including a pretreatment unit, an evaporator unit, a separation and recovery unit, a pipeline valve unit, and a control system. The pretreatment unit is linearly connected to the evaporator unit via the pipeline valve unit. The outlet of the evaporator unit is connected to the separation and recovery unit via a vertical pipeline to complete gas-liquid separation and material recovery. The control system is communicatively connected to the pretreatment unit, the evaporator unit, the separation and recovery unit, and the pipeline valve unit, forming a thermally driven continuous concentration closed-loop system. The pipeline valve unit has a quick-release sealing assembly 1 inside the pipeline body 2. Component 1 includes a vertical sliding part 11, a rotating part 12, a conical sealing part 13, and a roller guide part 14 disposed on the sealing part. One end of the rotating part 12 is hinged to the vertical sliding part 11, and the conical sealing part 13 is disposed on the other end of the rotating part 12. The vertical sliding part 11 slides vertically along the inner wall of the pipe body 2. The inner wall of the pipe body 2 contacts the roller guide part 14 and drives the roller 142 of the roller guide part 14 to slide horizontally. The roller 142 causes the rotating part 12 to rotate around the hinge point through linkage, which drives the side wall of the conical sealing part 13 to rotate and fit against the inner wall of the pipe to form a self-locking seal, achieving zero leakage.

[0032] It should be noted that the fish slurry first enters the flash tank, where some water evaporates by reducing pressure. Then, the slurry is sent to the concentration tank, where heating further evaporates water, increasing the concentration. The evaporated water is cooled and condensed by an air cooler. The condensed water enters the collection tank, where it is recovered by a condensate recovery machine and sent to the boiler for reuse. The concentrated fish slurry is further mixed in a stirring tank to ensure uniform concentration. A mechanical pump is used to circulate and transport the fish slurry, ensuring the continuity of the entire concentration process. The processing unit, used for filtering, heating, and homogenizing the raw fish slurry, includes a vibrating screen, a plate heat exchanger, and a homogenizing pump connected in sequence. The vibrating screen is configured to remove solid impurities with a particle size greater than 1 mm. The plate heat exchanger preheats the fish slurry to 50-70°C through steam circulation. The homogenizing pump homogenizes the viscosity of the fish slurry through pressure regulation. An evaporator unit, connected to the outlet of the pretreatment unit, is used to concentrate the fish slurry by evaporating water using thermal energy. It includes a heating chamber and a separation chamber. The heating chamber houses a falling film heat exchange tube bundle, with 0.3-0... The system generates 0.5 MPa saturated steam. A secondary steam outlet is located at the top of the separation chamber, and the bottom is connected to the concentrate discharge pipe via a conical guide structure. A separation and recovery device, connected to the secondary steam outlet of the evaporator system, includes a cyclone separator, a condenser, and a vacuum pump. The cyclone separator is connected to the top of the separation chamber via a vertical riser pipe for gas-liquid separation and trapping entrained droplets. The condenser is connected to the cyclone separator outlet via a U-shaped buffer pipe to recover volatile organic compounds. The vacuum pump is configured to maintain the system vacuum at -0.08 to -0.06 MPa. Piping and valve devices are also included. The system connects the pretreatment system, evaporator system, and separation and recovery device. The inner wall of its pipes is coated with a silicon carbide wear-resistant layer. Key connection nodes adopt a quick-release self-tightening sealing structure, which includes a tenon guide surface and a magnetic positioning module. Zero leakage is achieved through conical self-locking. The control system includes a PLC controller, temperature sensor, pressure sensor, and electric actuator. The temperature sensor is embedded in the heat exchange tube wall of the evaporator to monitor the temperature deviation in real time and feed it back to the PLC. The electric actuator adjusts the opening of the steam valve in conjunction with the control system to stabilize the evaporation temperature within the error range of ±2℃.

[0033] Currently, fish slurry concentration equipment often requires cleaning and maintenance due to the high viscosity and solid content of the material. However, the flange-sealing ring structure currently used has problems such as easy damage to the rubber sealing ring, uneven bolt tightening, and damage to the sealing surface during disassembly, which limits the operating efficiency of the equipment. Although existing improvement solutions attempt to use more corrosion-resistant sealing materials or optimize the structure, they have not fundamentally solved the problem of sealing failure caused by bolt tightening and repeated disassembly.

[0034] To address the aforementioned issues, this embodiment employs a quick-release sealing assembly 1, overcoming the shortcomings of the traditional flange-sealing ring structure. This assembly, through the coordinated design of the vertical sliding part 11, rotating part 12, conical sealing part 13, and roller guide part 14, achieves a self-locking seal by automatically rotating horizontally to fit the inner wall of the pipe after vertical insertion, eliminating the need for bolt fastening. The self-locking mechanism uses the radial force of the conical sealing part 13 to apply pressure evenly, preventing leakage caused by uneven preload. The roller guide part 14 converts sliding friction into rolling friction, reducing disassembly resistance and minimizing damage to the sealing surface. The combination of the trapezoidal sealing ring 3 and the elastic ring adapts to high-temperature expansion and corrosive environments, mitigating the effects of particle erosion and thermal stress, eliminating the risk of damage to the sealing surface from repeated disassembly, and simplifying the operation process.

[0035] Because the fish slurry thickening equipment requires frequent disassembly of the pipeline for cleaning and maintenance due to the high viscosity and solid content of the material, the design of the support block and the sliding block can achieve vertical sliding guidance. To prevent displacement during disassembly, in one embodiment, a support block is provided on the pipeline body 2, and the vertical sliding part 11 is the sliding block. The sliding block slides through the support block into the pipeline body 2. A circular hole is provided on the support block, which communicates with the pipeline body 2. A trapezoidal sealing ring 3 is fixedly fitted on the sliding block. The bottom of the trapezoidal sealing ring 3 is fixedly set on the sliding block, and the top of the trapezoidal sealing ring 3 is connected to the circular hole. The side wall is fitted, and the connection between the waist and top of the trapezoidal sealing ring 3 is an arc structure. The trapezoidal sealing ring 3 is designed here to facilitate the sliding block to slide into or out of the pipe body 2, and also to ensure the sealing performance. The trapezoidal sealing ring 3 is made of fluororubber. The circular hole of the support block cooperates with the sliding block to ensure vertical movement accuracy and avoid misalignment of the sealing surface. The top of the trapezoidal sealing ring 3 is fitted with the hole wall, and the arc waist absorbs thermal expansion deformation to adapt to high temperature conditions. The sliding block slides vertically along the support block without the need for bolt fastening, which shortens the disassembly time.

[0036] To ensure that the trapezoidal sealing ring 3 can only slide vertically without rotation, thus improving sealing performance, in one embodiment, the guide part is a guide rod, a vertical guide rail is provided on the circular hole, and a guide block 4 is provided on the top of the trapezoidal sealing ring 3. The guide block 4 slides along the vertical guide rail, which is U-shaped. When the trapezoidal sealing ring 3 slides vertically downwards, it just slides to... Figure 1In this state, the guide block 4 is exactly at the bottom of the U-shape of the vertical guide rail. When the trapezoidal sealing ring 3 slides to the bottom of the U-shaped guide rail, it can ensure that the sealing ring and the sealing surface are in closer contact, thus improving the sealing effect. In addition, the guide rail surface is plated with hard chrome and Ra≤0.4μm, and the guide block 4 is made of wear-resistant nylon with a friction coefficient μ=0.1. The cooperation between the vertical guide rail and the guide block 4 can restrict the rotational freedom of the sliding block, ensuring that the sealing ring is always aligned with the center of the pipe. The combination of the chrome-plated guide rail and the nylon guide block 4 reduces friction, extends the life of the sealing ring, and the guide rail can be disassembled and replaced to avoid the overall structure being scrapped due to wear.

[0037] Considering that the sealing structure is prone to leakage due to contact stress concentration under high pressure, in one embodiment, the rotating part 12 is a swing rod, and there are two swing rods, which are symmetrically arranged on the conical sealing part 13, such as... Figure 2 As shown, the angle between the swing rod and the vertical direction of the sliding block is 10°-15°. This 10°-15° angle causes the conical sealing part 13 to generate a radial component force when the sliding block is pressed down, increasing the contact pressure. At the same time, it also allows the swing rod to drive the conical sealing part 13 to form a seal with the pipe body 2, which is also convenient for disassembly. The angle design between the swing rod and the sliding block makes the contact stress distribution of the conical sealing part 13 more uniform during the contact process. This helps to reduce the phenomenon of contact stress concentration, thereby reducing leakage problems caused by stress concentration. The two symmetrically arranged swing rods help to improve the stability of the entire sealing structure. The 10°-15° angle between the swing rod and the sliding block allows the conical sealing part 13 to automatically adjust its contact position with the pipe body 2 when the sliding block is pressed down, achieving a precise seal. This design optimizes the sealing structure, making it more adaptable to different operating environments and pressure conditions.

[0038] Because a single conical seal is prone to momentary leakage due to vibration under dynamic operating conditions, in order to provide a secondary seal and enhance system reliability, in one embodiment, the conical seal part 13 includes a frustum-shaped protrusion. A swing rod is connected to the center of the bottom surface of the frustum-shaped protrusion. The diameter of the pipe body 2 is larger than the top diameter of the frustum-shaped protrusion but smaller than the bottom diameter. An elastic ring is fitted onto the frustum-shaped protrusion. The elastic ring is also frustum-shaped, but smaller than the frustum-shaped protrusion, ensuring that the elastic ring fits snugly on the frustum-shaped protrusion and will not fall off. Figure 2 or Figure 3 The frustum-shaped protrusion shown, after being fitted with an elastic ring, allows for a better seal between the frustum-shaped protrusion and the pipe body 2, such as... Figure 1The diagram does not show the truncated cone-shaped protrusion, but the location of the elastic ring can be clearly seen from the above description. The elastic ring is made of hydrogenated nitrile rubber. The conical sealing part 13 is responsible for static sealing, while the elastic ring is designed to withstand dynamic vibration. The hydrogenated nitrile rubber is resistant to organic acids and salts in the fish slurry, which increases its service life.

[0039] It is worth mentioning that the quick-release sealing component 1 installed inside the pipe body 2 of the pipeline valve device requires frequent cleaning and maintenance of the pipe body 2 after each concentration of fish slurry to ensure subsequent concentration efficiency. An electrically operated telescopic rod with vertical movement is connected to the sliding block, and this telescopic rod is communicatively connected to the control system. However, frequent disassembly inevitably leads to friction between the quick-release sealing component 1 and the pipe body 2, which can damage the pipe over time. To avoid this problem, in one embodiment, the roller guide 14 includes a quadrilateral fixing plate 141 mounted on the top surface of the frustum-shaped protrusion and quadrilateral fixing plates respectively mounted away from the frustum-shaped protrusion. Rollers 142 are located at the two top corners of the fixed plate 141. The two rollers 142 are the same size and are detachably slidably connected to the inner wall of the pipe body 2. The design of the rollers 142 can ensure that the friction between the quick-release sealing component 1 and the bottom of the inner wall of the pipe is small, so as to avoid damage to the pipe. On the other hand, it can also facilitate the compaction and fit between the frustum-shaped protrusion and the pipe body 2. Two rollers 142 must be used here because when the frustum-shaped protrusion is removed and when it is just inserted, two rollers 142 are needed to ensure that the friction between it and the bottom of the inner wall of the pipe is rolling friction, so as to ensure that the friction is small.

[0040] A fish slurry concentration process includes the following steps:

[0041] S1: Pre-treatment of fish slurry. The raw fish slurry is fed into the pre-treatment device, where it is passed through a vibrating screen to remove solid impurities with a particle size greater than 1mm, preheated to 50-70℃ by a plate heat exchanger, and then homogenized by a homogenizing pump. Removing large particles of impurities by the vibrating screen can improve the purity of the raw material, thereby ensuring the quality of the final product. The homogenizing pump treatment can reduce the viscosity of the fish slurry and improve its fluidity and heat transfer efficiency in subsequent processes.

[0042] S2: Evaporation and concentration. The pretreated fish slurry is transported to the heating chamber of the evaporator. Saturated steam is introduced through the outer wall of the falling film heat exchange tube bundle for heating. The fish slurry evaporates water in the separation chamber to form a concentrated liquid and secondary steam. The evaporation is carried out by the falling film heat exchange tube bundle. This method has the characteristics of high heat transfer efficiency and low heat loss, which helps to save energy.

[0043] S3: Gas-liquid separation and recovery. Secondary steam from the top of the separation chamber is introduced into a cyclone separator through a vertical pipe for gas-liquid separation. After capturing entrained droplets, volatile organic compounds are recovered through a condenser, and a vacuum pump maintains the system vacuum at -0.08 to -0.06 MPa. The recovery and utilization of secondary steam further improves energy efficiency and reduces environmental pollution.

[0044] S4: Sealing Operation and Maintenance. The quick-release sealing assembly 1 of the pipeline valve device enables rapid disassembly and sealing of pipeline connections. During disassembly, the vertical sliding part 11 slides along the inner wall of the pipeline body 2, driving the roller guide part 14 to move horizontally, causing the conical sealing part 13 to disengage from the inner wall of the pipeline and release the self-locking mechanism. During installation, the sliding block is pushed in the opposite direction, and the roller guide part 14, in conjunction with the conical sealing part 13, rotates to fit against the inner wall of the pipeline, forming a zero-leakage seal. The quick-release sealing assembly 1 makes the disassembly and installation of pipeline connections simpler and faster, reducing downtime for maintenance and improving production efficiency; the zero-leakage seal design ensures safety and hygiene during the production process.

[0045] S5: Control and Circulation. The PLC controller of the control system monitors the evaporator temperature and system pressure in real time, adjusts the steam valve opening to stabilize the evaporation temperature within the set range, and recovers the condensate to the boiler for recycling. The concentrated fish slurry is mixed evenly in the stirring tank before being output. The PLC controller can realize real-time monitoring and control, ensuring the stability of the evaporation process and the consistency of the product. By adjusting the steam valve opening to stabilize the evaporation temperature, the product quality is improved while avoiding energy waste caused by overheating.

[0046] The working principle and workflow of this invention:

[0047] The raw fish slurry is screened to remove solid impurities >1mm, preheated to 50-70℃ by a plate heat exchanger, and homogenized by a homogenizing pump to reduce viscosity for subsequent evaporation. The pretreated liquid enters the heating chamber of the evaporator, and saturated steam at 0.3-0.5MPa is introduced through the outer wall of the falling film heat exchanger tube bundle. The fish slurry forms a thin film in the separation chamber, rapidly evaporating water to generate concentrated liquid and secondary steam. The secondary steam enters a cyclone separator through a vertical pipe, where entrained droplets are separated. The condenser recovers volatile organic compounds. A vacuum pump maintains the system vacuum to ensure efficient evaporation. The pipe valve device uses a quick-release sealing assembly 1, with a sliding block penetrating the support block and sliding vertically along the inner wall of the pipe. A trapezoidal sealing ring 3 is fitted, whose arc-shaped waist can absorb thermal expansion deformation. The top fits against the side wall of the circular hole in the support block to ensure vertical guidance. The swing rod is hinged to the sliding block and tilted 1. From 0° to 15°, the vertical motion is converted into the movement of the conical sealing part 13 through the leverage effect, enhancing the sealing pressure. The frustum-shaped protrusion is interference-fitted with the inner wall of the pipe, and an elastic ring is fitted on the surface to achieve a seal. The quadrilateral fixing plate 141 is welded to the top of the frustum, and polyurethane rollers 142 are installed at both ends to convert sliding friction into rolling friction, reducing wear on the inner wall of the pipe and reducing disassembly resistance. When the sliding block is pressed down, the rollers 142 roll along the inner wall of the pipe, and the linkage swing rod deflects, causing the conical sealing part 13 to expand radially and fit tightly against the inner wall. During disassembly, it slides in the opposite direction, and the conical sealing part 13 contracts and disengages, achieving quick disassembly and assembly. No bolts are required throughout the process, achieving zero leakage. The PLC controller monitors the evaporator temperature and system pressure in real time, and adjusts the steam valve opening through the PID algorithm to stabilize the evaporation temperature. The condensate is recovered to the boiler for recycling, and the concentrate is output after homogenization in the stirring tank.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A fish slurry concentration device, characterized in that, The system includes a pretreatment unit, an evaporator unit, a separation and recovery unit, a pipeline valve unit, and a control system. The pretreatment unit is linearly connected to the evaporator unit via the pipeline valve unit. The outlet of the evaporator unit is connected to the separation and recovery unit via a vertical pipeline to complete gas-liquid separation and material recovery. The control system is communicatively connected to the pretreatment unit, the evaporator unit, the separation and recovery unit, and the pipeline valve unit, forming a thermally driven continuous concentration closed-loop system. The pipeline valve unit has a quick-release sealing assembly inside its pipe body. The quick-release sealing assembly includes a vertical sliding part, a rotating part, a conical sealing part, and a roller guide part disposed on the sealing part. One end of the rotating part is hinged to the vertical sliding part, and the conical sealing part is disposed on the other end of the rotating part. The vertical sliding part slides vertically along the inner wall of the pipeline body. The inner wall of the pipeline body contacts the roller guide part and drives the roller of the roller guide part to slide horizontally. The roller, through linkage, causes the rotating part to rotate around the hinge point, driving the side wall of the conical sealing part to rotate and fit against the inner wall of the pipeline to form a self-locking seal, achieving zero leakage.

2. The fish slurry concentration device according to claim 1, characterized in that, The pipe body is provided with a support block, and the vertical sliding part is a sliding block that slides through the support block into the pipe body.

3. The fish slurry concentration equipment according to claim 2, characterized in that, The support block has a circular hole that communicates with the pipe body. A trapezoidal sealing ring is fitted on the sliding block. The bottom of the trapezoidal sealing ring is fixedly mounted on the sliding block, and the top of the trapezoidal sealing ring is in contact with the side wall of the circular hole.

4. The fish slurry concentration device according to claim 3, characterized in that, The connection between the waist and top of the trapezoidal sealing ring has an arc-shaped structure.

5. The fish slurry concentration device according to claim 3, characterized in that, The guide part is a guide rod, a vertical guide rail is provided on the circular hole, and a guide block is provided on the top of the trapezoidal sealing ring. The guide block slides along the vertical guide rail.

6. The fish slurry concentration device according to claim 2, characterized in that, The rotating part is a swing rod, and the angle between the swing rod and the vertical direction of the sliding block is 10°-15°.

7. The fish slurry concentration device according to claim 6, characterized in that, The conical sealing part includes a frustum-shaped protrusion, the swing rod is connected to the center of the bottom surface of the frustum-shaped protrusion, and the diameter of the pipe body is greater than the top surface diameter of the frustum-shaped protrusion and smaller than the bottom surface diameter of the frustum-shaped protrusion.

8. The fish slurry concentration device according to claim 7, characterized in that, An elastic ring is fitted onto the frustum-shaped protrusion.

9. A fish slurry concentration device according to claim 7, characterized in that, The roller guide includes a quadrilateral fixing plate disposed on the top surface of the frustum-shaped protrusion and rollers disposed at the two apex corners of the quadrilateral fixing plate away from the frustum-shaped protrusion. The two rollers are the same size and are detachably slidably connected to the inner wall of the pipe body.

10. A fish sol concentration process, based on the fish sol concentration equipment according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Pre-treatment of fish slurry. The raw fish slurry is fed into the pre-treatment device, and solid impurities with a particle size greater than 1mm are removed by a vibrating screen. It is then preheated to 50-70℃ by a plate heat exchanger and homogenized by a homogenizing pump. S2: Evaporation and concentration. The pretreated fish slurry is transported to the heating chamber of the evaporator device. Saturated steam is introduced through the outer wall of the falling film heat exchange tube bundle for heating, so that the fish slurry evaporates water in the separation chamber to form concentrated liquid and secondary steam. S3: Gas-liquid separation and recovery. Secondary steam from the top of the separation chamber is introduced into a cyclone separator through a vertical pipe for gas-liquid separation. After capturing entrained droplets, volatile organic compounds are recovered through a condenser, and the system vacuum is maintained at -0.08 to -0.06 MPa by a vacuum pump. S4: Sealing operation and maintenance. The quick-release sealing assembly of the pipeline valve device enables quick disassembly and sealing of the pipeline connection. During disassembly, the vertical sliding part slides along the inner wall of the pipeline body, driving the roller guide part to move horizontally, causing the conical sealing part to disengage from the inner wall of the pipeline and release the self-locking. During installation, the sliding block is pushed in the opposite direction, and the roller guide part is linked to the conical sealing part to rotate and fit against the inner wall of the pipeline, forming a zero-leakage seal. S5: Control and Circulation. The PLC controller of the control system monitors the evaporator temperature and system pressure in real time, adjusts the opening of the steam valve to stabilize the evaporation temperature within the set value range, and recovers the condensate to the boiler for recycling. The concentrated fish slurry is mixed evenly in the stirring tank before being output.

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