Multi-stage steam distribution disc for double-effect concentrator

Abstract

The utility model provides a kind of multistage steam distribution disc for double-effect concentrator, it is related to the technical field of concentrator, including steam distribution disc, the inside fixed installation of steam distribution disc has the laser ranging sensor for detecting its position, the laser ranging sensor signal is connected with the microprocessor of being carried out automatic control, the microprocessor signal is connected with the adjusting support of being connected to the steam distribution disc Support, the utility model has the advantages that: the distribution structure of steam heating system is optimized, the original single-layer steam distribution disc is improved into multistage distribution disc assembly along the height direction distribution of heating cavity, form grading flow guide space between distribution level, change the flow path and distribution density of steam from inlet to heat exchange surface, by adjusting the number, spacing and aperture layout of distribution disc, realize the uniform diffusion and step-by-step release of steam in heating chamber, improve heat transfer uniformity, avoid local dry burning or coking phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of concentrator technology, and in particular to a multi-stage steam distribution plate for a double-effect concentrator. Background Technology

[0002] In industries such as chemical, pharmaceutical, and food processing, double-effect concentrators are core equipment for achieving efficient material concentration through the secondary utilization of latent heat of steam. They are widely used in scenarios such as fruit juice concentration, traditional Chinese medicine extract concentration, and chemical solution purification. The steam distribution plate can evenly distribute steam to the heating surface, ensuring a consistent temperature throughout the heating chamber, and is a key component of the double-effect concentrator's heating chamber.

[0003] However, some existing double-effect concentrators have a single-layer steam distribution plate, which has poor regulation of steam flow path and distribution density, resulting in poor heat transfer uniformity and easy to cause local dry burning or coking. Utility Model Content

[0004] Therefore, the purpose of this utility model is to propose a multi-stage steam distribution plate for a double-effect concentrator to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, one embodiment of this utility model provides a multi-stage steam distribution plate for a double-effect concentrator, including a heating chamber for heating the feed liquid. Several vertically distributed steam distribution plates are arranged inside the heating chamber. A laser rangefinder sensor for detecting the position of each steam distribution plate is fixedly installed inside the plate. The laser rangefinder sensor is signal-connected to a microprocessor for automated control. The microprocessor is signal-connected to an adjusting rod that supports the steam distribution plate. One end of the adjusting rod is fixedly mounted with a mounting base for support. An adjusting airbag assembly covered with heat-insulating material is fixedly installed inside the steam distribution plate. One end of the adjusting airbag assembly is fixedly mounted with an airtight gasket for sealing. Steam guide holes are provided at both ends of the steam distribution plate, and an airtight ring gasket is provided in the middle of each guide hole for sealing. All structures are designed to withstand high temperatures to prevent steam damage and ensure operational stability.

[0006] Preferably, in any of the above embodiments, the heating chamber is provided with a heating pipe for conveying the liquid material, and a heating cavity located inside the heating chamber is provided around the heating pipe. Steam inlets are provided at both ends of the heating cavity.

[0007] The above technical solution employs the following: the heating chamber provides a sealed space for heating the liquid; heating tubes (made of titanium alloy and arranged in a tubular pattern) transport the liquid to be concentrated (such as traditional Chinese medicine extract or fruit juice); the liquid inside the tubes exchanges heat with the steam outside the tubes; the heating cavity (located between the inner wall of the heating chamber and the heating tubes) provides a channel for steam flow; and the two gas inlets at both ends realize steam input and secondary steam output, respectively. The stainless steel material of the heating chamber is corrosion-resistant and suitable for the high-temperature steam environment of the double-effect concentrator, avoiding contamination of the liquid; the titanium alloy material of the heating tubes has a high thermal conductivity, improving heat exchange efficiency; the tubular arrangement ensures uniform heating area and avoids local overheating; the width design of the heating cavity ensures stable steam flow rate and reduces flow resistance; and the flange connection of the gas inlet facilitates connection with external steam pipelines, enabling steam recycling.

[0008] Preferably, in any of the above embodiments, the outer periphery of the steam distribution plate is fitted to the inner wall of the heating chamber, one end of the steam distribution plate is provided with a connecting seat for fixing the adjusting support rod, and the laser rangefinder is located on one side of the connecting seat.

[0009] The above technical solution employs the following: Steam distribution plates (made of stainless steel with vent holes on the surface) are distributed vertically within the heating chamber to achieve multi-level steam distribution. A connecting base (made of stainless steel and welded to the steam distribution plates) provides an installation interface for the adjusting support rod. A laser rangefinder (infrared type, connected to a microprocessor signal) is fixed to one side of the connecting base to detect the distance between adjacent distribution plates and the distance between the distribution plate and the heating chamber wall. The multi-level design of the steam distribution plates divides the heating chamber into multiple sub-spaces, allowing steam to diffuse gradually and preventing direct steam impact on the heating tubes, which could lead to localized overheating. The adjustable aperture and opening ratio of the vent holes can adapt to different steam flow rates, ensuring stable steam velocity. The welded connection of the connecting base ensures a firm connection between the adjusting support rod and the distribution plate, preventing the distribution plate from shaking. The high-precision detection of the laser rangefinder provides a basis for adjusting the spacing between the distribution plates, avoiding uneven steam distribution caused by spacing deviations.

[0010] Preferably, in any of the above embodiments, the adjusting rod includes a high-temperature resistant electric rod connected to a microprocessor signal and a drive block for transmitting power. The high-temperature resistant electric rod is located inside the heating chamber, and the output end of the high-temperature resistant electric rod is fixedly installed with the drive block, which is fixedly installed inside the connecting seat.

[0011] Preferably, in any of the above embodiments, the mounting base is fixedly installed inside the heating chamber, and the end of the high-temperature resistant electric rod away from the drive block is fixedly installed with the steam distribution plate and the mounting base.

[0012] The above technical solution is adopted as follows: the high-temperature resistant electric rod (made of stainless steel and connected to the microprocessor signal) of the adjusting support rod drives the distribution plate to move. The drive block and the connecting seat are fixed with bolts to transmit power. The mounting seat (made of stainless steel and welded to the inner wall of the heating chamber) fixes the fixed end of the high-temperature resistant electric rod. The stroke design of the high-temperature resistant electric rod is adapted to different heating chamber heights, which can realize precise adjustment of the distribution plate spacing to meet the concentration requirements of different liquids. The rigid structure of the drive block ensures lossless power transmission. The bolt fixing facilitates disassembly and maintenance. The welding fixing of the mounting seat provides stable support and avoids shaking of the electric rod during operation. Its temperature resistance characteristics ensure that it will not fail in the high-temperature environment of the heating chamber.

[0013] Preferably, in any of the above embodiments, the regulating airbag assembly includes a micro air pump connected to a microprocessor signal and an airbag pad for support. The micro air pump is fixedly installed at the bottom of the steam distribution plate, and the output end of the micro air pump is fixedly installed with an airbag pad located inside the steam distribution plate. The airbag pad has a covering hole corresponding to the heating tube inside, and an airtight rubber pad is fixedly installed inside the covering hole of the airbag pad, and the airtight rubber pad covers and adheres to the surface of the heating tube.

[0014] The above technical solution involves adjusting the micro-pump (high-temperature resistant model, connected to the microprocessor signal) of the airbag assembly to inflate the airbag pad. The airbag pad (made of silicone rubber) adheres to the surface of the heating tube, and the airtight rubber pad (made of fluororubber, covering the inner wall of the airbag pad's covering hole) enhances the sealing performance. The inflation control of the micro-pump can adjust the expansion degree of the airbag pad, ensuring that the airtight rubber pad tightly adheres to the heating tube, preventing steam leakage between the distribution plate and the heating tube. The silicone rubber material of the airbag pad has excellent temperature resistance and can adapt to the thermal expansion and contraction of the heating tube. The fluororubber material of the airtight rubber pad is resistant to steam corrosion, and its high sealing performance ensures that steam flows only through the air guide hole, improving the uniformity of distribution.

[0015] Preferably, in any of the above embodiments, the air guide hole and the adjusting support rod are vertically distributed on the steam distribution plate, the airtight ring gasket is rotatably connected to the inside of the steam distribution plate, and the two ends of the airtight ring gasket are provided with elastic rubber gaskets for sealing.

[0016] The above technical solution employs the following: Air guide holes (circular holes arranged in a ring array on the steam distribution plate) guide the radial flow of steam. An airtight ring gasket (made of silicone rubber, with a diameter adapted to the air guide holes and elastic gaskets at both ends) is inserted into the distribution plate, allowing it to rotate and slide under external force, thus enabling the air guide holes to open and close and regulating the flow rate. The ring array distribution of the air guide holes ensures uniform radial diffusion of steam along the distribution plate. The adjustable orifice diameter design (by replacing orifice plates with different orifice diameters) adapts to different steam flow rates. The rotation adjustment of the airtight ring gasket can change the opening area of ​​the air guide holes, achieving precise control of the steam flow rate. For example, in the high concentration stage, reducing the opening area lowers the steam flow rate and prevents liquid splashing. The elastic gaskets at both ends enhance the seal between the airtight ring gasket and the distribution plate, preventing steam leakage from the gaps in the ring gasket.

[0017] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0018] 1. The distribution structure of the steam heating system was optimized. The original single-layer steam distribution plate was improved into a multi-level distribution plate assembly distributed along the height of the heating cavity. By forming a graded flow guiding space between the distribution levels, the flow path and distribution density of steam from the inlet to the heat exchange surface were changed. By adjusting the number, spacing and opening layout of the distribution plates, uniform diffusion and step-by-step release of steam in the heating chamber were achieved, improving the heat transfer uniformity and avoiding local dry burning or coking.

[0019] 2. Multiple movable and adjustable steam distribution plates are installed inside the heating chamber of the double-effect concentrator. The number of steam distribution plates can be adjusted according to needs. After installation, the spacing of the steam distribution plates can be precisely adjusted by controlling the adjustment rod in conjunction with the detection feedback of the laser rangefinder, which facilitates the rapid and accurate adjustment of the steam flow path and distribution seal, and improves the convenience of adjusting the position of the steam distribution plates.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a structural schematic diagram according to an embodiment of the present utility model.

[0023] Figure 2 This is a partial structural diagram according to an embodiment of the present utility model.

[0024] Figure 3 This is a schematic diagram of the steam distribution plate according to an embodiment of the present invention.

[0025] Figure 4 This is a cross-sectional structural diagram of the heating chamber according to an embodiment of the present invention.

[0026] Figure 5 This is a cross-sectional structural diagram of the steam distribution plate according to an embodiment of the present utility model;

[0027] Figure 6 This is a cross-sectional structural diagram of the adjustable airbag assembly according to an embodiment of the present invention.

[0028] The components are: 1-Heating chamber, 2-Steam distribution plate, 3-Laser rangefinder sensor, 4-Adjusting support rod, 41-High temperature resistant electric rod, 42-Drive block, 5-Mounting base, 6-Adjusting airbag assembly, 61-Miniature air pump, 62-Airbag pad, 7-Airtight rubber pad, 8-Air guide hole, 9-Airtight ring pad, 10-Heating tube, 11-Connecting base. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0030] like Figure 1-6 As shown in the figure, a multi-stage steam distribution plate for a double-effect concentrator according to an embodiment of the present invention includes a heating chamber 1 for heating the feed liquid. Several vertically distributed steam distribution plates 2 are arranged inside the heating chamber 1. A laser rangefinder 3 for detecting the position of each steam distribution plate 2 is fixedly installed inside the plate. The laser rangefinder 3 is connected to a microprocessor for automated control. The microprocessor is connected to an adjusting rod 4 for supporting the steam distribution plate 2. A mounting base 5 for supporting and fixing the adjusting rod 4 is fixedly installed at one end. An adjusting airbag assembly 6 covered with heat-insulating material is fixedly installed inside the steam distribution plate 2. An airtight gasket 7 for sealing is fixedly installed at one end of the adjusting airbag assembly 6. Steam guide holes 8 are opened at both ends of the steam distribution plate 2, and an airtight ring gasket 9 for sealing the middle of each steam guide hole 8 is provided. All structures are designed to withstand high temperatures to prevent steam damage and ensure operational stability.

[0031] Preferably, in any of the above schemes, a heating pipe 10 for conveying liquid is provided inside the heating chamber 1, and a heating cavity located inside the heating chamber 1 is provided around the heating pipe 10. Steam inlets are provided at both ends of the heating cavity.

[0032] The above technical solution is adopted as follows: the heating chamber 1 provides a sealed space for heating the liquid, the heating tubes 10 (made of titanium alloy and arranged in a tube-like pattern) transport the liquid to be concentrated (such as traditional Chinese medicine extract or fruit juice), the liquid inside the tubes exchanges heat with the steam outside the tubes, the heating cavity (located between the inner wall of the heating chamber 1 and the heating tubes 10) provides a channel for steam flow, and the two gas outlets at both ends realize steam input and secondary steam output respectively. The stainless steel material of the heating chamber 1 is corrosion resistant and suitable for the high-temperature steam environment of the double-effect concentrator, avoiding contamination of the liquid. The titanium alloy material of the heating tubes 10 has a high thermal conductivity, which improves the heat exchange efficiency. The tube-like arrangement ensures uniform heating area and avoids local overheating. The width design of the heating cavity ensures stable steam flow rate and reduces flow resistance. The flange connection of the gas outlet facilitates connection with external steam pipelines and realizes steam recycling.

[0033] Heating chamber 1 maintains stable steam pressure through a sealed structure, providing conditions for heat exchange. Heating tube 10 is based on the shell-and-tube heat exchange principle. The steam outside the tube condenses and releases latent heat, which is transferred to the liquid inside the tube through the tube wall, realizing the heating and concentration of the liquid. The heating chamber utilizes spatial separation to allow steam to flow along a preset path, ensuring full contact with the heating tube. During concentration, primary steam enters through the gas outlet at one end of the heating chamber, flows outside the heating tube 10 and condenses and releases heat. The liquid inside the heating tube absorbs heat and its temperature rises. The water evaporates to form secondary steam, which is discharged through the gas outlet at the other end of the heating chamber and enters the next-effect concentrator for recycling. The liquid continuously flows inside the heating tube to avoid coking due to excessive residence time. Heating chamber 1 needs to be cleaned regularly to remove scale from the inner wall and the surface of the heating tube to ensure heat exchange efficiency. The steam temperature in the heating chamber is monitored by a temperature sensor, and the opening of the steam valve is controlled by a PLC to maintain temperature stability. The flow rate of the liquid inside the heating tube is controlled by a variable frequency pump. A differential pressure sensor detects the pressure difference between the inlet and outlet of the heating chamber. When the pressure difference exceeds the standard, it is determined to be scale blockage, triggering a cleaning reminder.

[0034] Preferably, in any of the above schemes, the outer periphery of the steam distribution plate 2 is fitted to the inner wall of the heating chamber 1, and a connecting seat 11 for fixing the adjusting support rod 4 is provided at one end of the steam distribution plate 2, with the laser range sensor 3 located on one side of the connecting seat 11.

[0035] The above technical solution is adopted as follows: Steam distribution plates 2 (made of stainless steel with air guide holes 8 on the surface) are distributed vertically inside the heating chamber 1 to achieve multi-level steam distribution. Connecting seat 11 (made of stainless steel and welded to the steam distribution plate 2) provides an installation interface for adjusting support rod 4. Laser ranging sensor 3 (infrared type, connected to the microprocessor signal) is fixed on one side of the connecting seat to detect the distance between adjacent distribution plates and the distance between the distribution plate and the heating chamber wall. The multi-level design of steam distribution plate 2 divides the heating chamber into multiple sub-spaces, allowing steam to diffuse step by step and avoiding direct impact of steam on the heating tube, which would cause local overheating. The adjustable aperture and opening ratio of the air guide holes 8 can be adapted to different steam flow rates to ensure stable steam flow rate. The welding and fixing of the connecting seat 11 ensures that the adjusting support rod 4 is firmly connected to the distribution plate and avoids the distribution plate shaking. The high-precision detection of laser ranging sensor 3 provides a basis for adjusting the distance between the distribution plates and avoids uneven steam distribution caused by distance deviation.

[0036] The steam distribution plate 2, through physical barriers and air guide holes, changes the steam flow direction (from vertical flow to radial diffusion), extending the residence time of steam in the heating chamber and improving heat exchange efficiency. The laser rangefinder 3, based on the principle of infrared reflection, calculates the distance by measuring the time difference between transmitted and received signals, providing real-time position data for microprocessor adjustment. During installation, according to the requirements for liquid concentration (e.g., increased spacing for high-viscosity liquids), the initial spacing is detected by the laser rangefinder 3, and the microprocessor controls the adjusting rod 4 to adjust the steam distribution plate 2 to the target position. During concentration, the steam... After the steam diffuses through the air guide holes of the primary distribution plate, it enters the area of ​​the secondary distribution plate, diffuses again, and then contacts the heating tube. During operation, the sensor continuously monitors the spacing. If the spacing changes due to thermal expansion and contraction, the microprocessor controls the adjusting rod to make fine adjustments to maintain a stable spacing. After shutdown, the sensor checks the reset status of the distribution plate to ensure accuracy in the next operation. The microprocessor presets the spacing threshold of the distribution plate, and the laser ranging sensor 3 provides feedback data at regular intervals. When the threshold is exceeded, the adjusting rod is triggered. Multi-point detection is used (two sensors are installed on each distribution plate) to ensure uniform spacing. The sensors are calibrated regularly to avoid temperature interference.

[0037] Preferably, in any of the above schemes, the adjusting rod 4 includes a high-temperature resistant electric rod 41 connected to a microprocessor signal and a drive block 42 for transmitting power. The high-temperature resistant electric rod 41 is located inside the heating chamber 1, and the output end of the high-temperature resistant electric rod 41 is fixedly installed with the drive block 42, which is fixedly installed inside the connecting seat 11.

[0038] Preferably, in any of the above schemes, the mounting base 5 is fixedly installed inside the heating chamber 1, and the end of the high-temperature resistant electric rod 41 away from the drive block 42 is fixedly installed with the steam distribution plate 2 and the mounting base 5.

[0039] The above technical solution is adopted as follows: the high-temperature resistant electric rod 41 (made of stainless steel and connected to the microprocessor signal) of the adjusting support rod 4 drives the distribution plate to move. The drive block 42 is bolted to the connecting seat 11 to transmit power. The mounting seat 5 (made of stainless steel and welded to the inner wall of the heating chamber 1) fixes the fixed end of the high-temperature resistant electric rod. The stroke design of the high-temperature resistant electric rod 41 is adapted to different heating chamber heights, which can realize the precise adjustment of the distribution plate spacing to meet the concentration requirements of different liquids. The rigid structure of the drive block 42 ensures that the power transmission is lossless. The bolt fixing is convenient for disassembly and maintenance. The welding fixing of the mounting seat 5 provides stable support and avoids the electric rod from shaking during operation. Its temperature resistance characteristics ensure that it will not fail in the high-temperature environment of the heating chamber.

[0040] The high-temperature resistant electric rod 41 is based on the screw drive principle, converting the rotational motion of the motor into linear motion. The drive block 42 drives the steam distribution plate 2 to move axially. The mounting base 5 is rigidly connected to the heating chamber 1 by welding, providing a fixed reference for the electric rod and ensuring the adjustment direction is vertical. During adjustment, the microprocessor receives the spacing data from the laser rangefinder 3. If the spacing needs to be increased, the high-temperature resistant electric rod 41 extends, and the drive block 42 pushes the connecting seat 11 to move synchronously with the distribution plate. During the movement, the sensor provides real-time position feedback. After reaching the target spacing, the electric rod stops and self-locks. If the spacing needs to be decreased, the electric rod retracts, causing the distribution plate to move in the opposite direction. The mounting base 5 continuously provides fixation for the electric rod, ensuring stable adjustment. PID closed-loop control is used; the microprocessor calculates the extension / retraction amount of the electric rod based on the position deviation fed back by the sensor, precisely controlling the position. End-point protection for the electric rod's travel is set to prevent overtravel damage. The electric rod screw is lubricated regularly to ensure smooth adjustment.

[0041] Preferably, in any of the above embodiments, the regulating airbag assembly 6 includes a micro air pump 61 connected to a microprocessor signal and an airbag pad 62 for support. The micro air pump 61 is fixedly installed at the bottom of the steam distribution plate 2. The output end of the micro air pump 61 is fixedly installed with the airbag pad 62 located inside the steam distribution plate 2. The airbag pad 62 has a covering hole corresponding to the heating tube 10 inside. An airtight rubber pad 7 is fixedly installed inside the covering hole of the airbag pad 62 and covers and adheres to the surface of the heating tube 10.

[0042] The above technical solution is adopted as follows: the micro air pump 61 (high temperature resistant model, connected to the microprocessor signal) of the airbag assembly 6 inflates the airbag pad 62. The airbag pad 62 (silicone rubber material) is attached to the surface of the heating tube. The airtight rubber pad 7 (fluororubber material, covering the inner wall of the airbag pad covering hole) enhances the sealing performance. The inflation control of the micro air pump 61 can adjust the expansion degree of the airbag pad 62, so that the airtight rubber pad 7 is tightly attached to the heating tube 10, blocking the leakage of steam in the gap between the distribution plate and the heating tube. The silicone rubber material of the airbag pad 62 has excellent temperature resistance and can adapt to the thermal expansion and contraction of the heating tube. The fluororubber material of the airtight rubber pad 7 is resistant to steam corrosion. Its high sealing performance ensures that steam flows only through the air guide hole 8, improving the uniformity of distribution.

[0043] A miniature air pump 61 injects compressed air into the airbag pad 62. After the airbag pad expands, it pushes the airtight rubber pad 7 into close contact with the outer wall of the heating tube. The elastic deformation of the rubber fills the gap, achieving a physical seal. The encapsulation hole design of the airbag pad prevents rigid contact between the distribution plate and the heating tube, avoiding damage to the distribution plate caused by the vibration of the heating tube. After the distribution plate position is adjusted, the microprocessor controls the miniature air pump 61 to start and inflate the airbag pad 62. The expansion of the airbag pad causes the airtight rubber pad 7 to adhere to the surface of the heating tube. The pressure sensor monitors the pressure inside the airbag. When it reaches 0.2 MPa, the air pump stops. During the concentration process, if the pressure drops, the air pump automatically replenishes the air. After the machine stops, the air pump releases the air, and the airbag pad contracts, making it easy to disassemble and clean the distribution plate. The microprocessor sets the airbag pad pressure threshold, and the pressure sensor provides feedback data at regular intervals. When the threshold is exceeded, the air pump is controlled to start and stop. The expansion amount of the airbag pad is monitored by a displacement sensor. When the expansion amount exceeds the standard, inflation stops to avoid excessive compression of the heating tube. The wear condition of the airtight rubber pad is checked regularly, and it is replaced when it is worn out.

[0044] Preferably, in any of the above schemes, the air guide hole 8 and the adjusting support rod 4 are vertically distributed on the steam distribution plate 2, the airtight ring gasket 9 is rotatably connected to the inside of the steam distribution plate 2, and elastic rubber gaskets are provided at both ends of the airtight ring gasket 9 to seal it.

[0045] The above technical solution is adopted as follows: the air guide hole 8 (circular holes, distributed in a ring array on the steam distribution plate 2) guides the steam radial flow. The airtight ring gasket 9 (made of silicone rubber, with a diameter adapted to the air guide hole and elastic rubber gaskets at both ends) is inserted into the distribution plate so that it can rotate and slide under the action of external force, realizing the opening and closing of the air guide hole and the flow rate regulation. The ring array distribution of the air guide hole 8 ensures that the steam diffuses evenly along the radial direction of the distribution plate. The adjustable hole diameter design (by replacing the orifice plate with different hole diameters) adapts to different steam flow rates. The rotation adjustment of the airtight ring gasket 9 can change the opening area of ​​the air guide hole, realizing precise control of the steam flow rate. For example, in the high concentration stage, the opening area is reduced to reduce the steam flow rate and avoid liquid splashing. The elastic rubber gaskets at both ends enhance the seal between the airtight ring gasket and the distribution plate and prevent steam from leaking from the gap of the ring gasket.

[0046] The air guide hole 8 is based on the orifice outflow principle of fluid mechanics. When steam passes through the orifice, the flow velocity increases, enhancing the contact effect with the heating tube. The airtight ring gasket 9 is fixed by the elasticity of its own material and the compression of the steam distribution plate 2. It can be rotated and adjusted by external force. Before installation, the airtight ring gasket 9 is adjusted to the required position and then fixed under the compression action. The airtight ring gasket 9 changes the degree of overlap with the air guide hole by rotation. The higher the degree of overlap, the larger the opening area and the greater the steam flow, and vice versa, thus achieving flow regulation. The airtight ring gasket needs to be cleaned regularly to remove condensate and impurities from the surface and ensure smooth rotation. The microprocessor controls the rotation angle of the airtight ring gasket 9 through a stepper motor. The angle is linearly related to the opening area. The flow threshold is set, and the opening area is automatically adjusted by the feedback data from the steam flow meter. Temperature closed-loop control is adopted. When the local temperature of the heating tube exceeds the threshold, the corresponding area of ​​the air guide hole is immediately closed.

[0047] The working principle of the multi-stage steam distribution plate for a double-effect concentrator of this utility model is as follows:

[0048] Adjust the number of steam distribution plates 2 as needed, control the rotation of the airtight ring gasket 9 to open the air guide holes 8 of the steam distribution plates 2 to the preset area. After installation and starting the double-effect concentrator, first control the high-temperature resistant electric rod 41 of the adjusting support rod 4 via the microprocessor. The drive block 42 drives the steam distribution plates 2 to move axially along the heating chamber 1. At the same time, the laser distance sensor 3 on the steam distribution plates 2 detects the distance between adjacent distribution plates and the distance between the distribution plates and the heating chamber wall in real time. The data is fed back to the microprocessor. When the distance is adjusted to the target value, the electric rod stops and self-locks. The microprocessor then controls the micro pump 61 of the airbag assembly 6 to start, inflating the airbag pad 62. The expansion of the airbag pad pushes the airtight rubber pad 7 to tightly adhere to the surface of the heating tube 10, blocking steam leakage. The primary steam enters through the air outlet of the heating chamber 1, first flowing through the air guide hole 8 of the first-stage steam distribution plate 2 for radial diffusion, and then entering the area of ​​the next-stage distribution plate for repeated diffusion, uniformly covering the outside of the heating tube 10 step by step. The steam condenses and releases latent heat, which is transferred to the liquid inside the tube through the heating tube. The secondary steam generated by the heating and evaporation of the liquid is discharged through the air outlet at the other end of the heating chamber for recycling.

[0049] Compared with the prior art, the present invention has the following advantages:

[0050] 1. The distribution structure of the steam heating system was optimized. The original single-layer steam distribution plate was improved into a multi-level distribution plate assembly distributed along the height of the heating cavity. By forming a graded flow guiding space between the distribution levels, the flow path and distribution density of steam from the inlet to the heat exchange surface were changed. By adjusting the number, spacing and opening layout of the distribution plates, uniform diffusion and step-by-step release of steam in the heating chamber were achieved, improving the heat transfer uniformity and avoiding local dry burning or coking.

[0051] 2. Multiple movable and adjustable steam distribution plates 2 are installed inside the heating chamber 1 of the double-effect concentrator. The number of steam distribution plates 2 can be adjusted according to the needs. After installation, the spacing of the steam distribution plates 2 can be precisely adjusted by controlling the adjustment rod 4 in combination with the detection feedback of the laser rangefinder 3 according to the usage requirements. This facilitates the rapid and accurate adjustment of the steam flow path and distribution seal, and improves the convenience of adjusting the position of the steam distribution plates 2.

Claims

1. A multi-stage steam distribution plate for a double-effect concentrator, comprising a heating chamber (1) for heating the feed liquid, wherein the heating chamber (1) is provided with a plurality of vertically distributed steam distribution plates (2), characterized in that: The steam distribution plate (2) is fixedly installed with a laser rangefinder (3) for detecting its position. The laser rangefinder (3) is connected to a microprocessor for automatic control. The microprocessor is connected to an adjusting rod (4) for connecting and supporting the steam distribution plate (2). One end of the adjusting rod (4) is fixedly installed with a mounting base (5) for supporting and fixing it. The steam distribution plate (2) is fixedly installed with an adjusting airbag assembly (6) covered with heat insulation material. One end of the adjusting airbag assembly (6) is fixedly installed with an airtight rubber gasket (7) for sealing connection. The steam distribution plate (2) has air guide holes (8) for guiding steam at both ends. An airtight ring gasket (9) for sealing the air guide hole (8) is provided in the middle of the air guide hole (8).

2. The multi-stage steam distribution plate for a double-effect concentrator as described in claim 1, characterized in that: The heating chamber (1) is equipped with a heating pipe (10) for conveying liquid. The heating pipe (10) is surrounded by a heating cavity located inside the heating chamber (1). Steam inlets are opened at both ends of the heating cavity.

3. The multi-stage steam distribution plate for a double-effect concentrator as described in claim 2, characterized in that: The outer periphery of the steam distribution plate (2) is attached to the inner wall of the heating chamber (1). One end of the steam distribution plate (2) is provided with a connecting seat (11) for fixing the adjusting support rod (4). The laser range sensor (3) is located on one side of the connecting seat (11).

4. A multi-stage steam distribution plate for a double-effect concentrator as described in claim 3, characterized in that: The adjusting rod (4) includes a high-temperature resistant electric rod (41) connected to a microprocessor signal and a drive block (42) for transmitting power. The high-temperature resistant electric rod (41) is located inside the heating chamber (1). The output end of the high-temperature resistant electric rod (41) is fixedly installed with the drive block (42), which is fixedly installed inside the connecting seat (11).

5. A multi-stage steam distribution plate for a double-effect concentrator as described in claim 4, characterized in that: The mounting base (5) is fixedly installed inside the heating chamber (1), and the end of the high-temperature resistant electric rod (41) away from the drive block (42) is fixedly installed with the steam distribution plate (2) and the mounting base (5).

6. A multi-stage steam distribution plate for a double-effect concentrator as described in claim 5, characterized in that: The regulating airbag assembly (6) includes a micro air pump (61) connected to a microprocessor signal and an airbag pad (62) for support. The micro air pump (61) is fixedly installed at the bottom of the steam distribution plate (2). The output end of the micro air pump (61) is fixedly installed with the airbag pad (62) located inside the steam distribution plate (2). The airbag pad (62) has a covering hole corresponding to the heating tube (10) inside. The airtight rubber pad (7) is fixedly installed inside the covering hole of the airbag pad (62) and covers and adheres to the surface of the heating tube (10).

7. A multi-stage steam distribution plate for a double-effect concentrator as described in claim 6, characterized in that: The air guide hole (8) and the adjusting support rod (4) are vertically distributed on the steam distribution plate (2). The airtight ring gasket (9) is rotatably connected to the inside of the steam distribution plate (2). The two ends of the airtight ring gasket (9) are provided with elastic rubber gaskets for sealing.

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