Feeding self-adaptive fluidized bed with material concentration sensing system

Abstract

The utility model relates to an automatic control system for material drying. The feeding self-adaptive fluidized bed with the material concentration sensing system comprises a fluidization plate and a fan, the fan is provided with a wind speed control interface for controlling wind speed, materials are arranged on the fluidization plate, and at least one group of material concentration sensing system is arranged on two sides of the fluidization plate towards the direction of a discharge port; the material concentration sensing system comprises a group of active sending device and passive receiving device which are matched with each other; the active sending device is arranged on one side of the fluidization plate, and the sending direction of the active sending device penetrates through materials on the fluidization plate and then faces the passive receiving device. The passive receiving device is arranged on the other side of the fluidization plate, and the receiving direction faces the sending direction of the active sending device; an output interface of the material concentration sensing system is connected with the wind speed control interface. The air speed of the draught fan is adjusted by detecting the material concentration, different kinds of feeding can be automatically adjusted to reach the needed critical fluidization speed, and the automatic feeding device has the beneficial effects that the downtime is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to an automatic control system for material drying, in particular to a fluidized bed. Background Art

[0002] Fluidized bed, abbreviated as fluidized bed, is a reactor that uses gas or liquid to pass through a granular solid layer to put solid particles in a suspended motion state and carry out a gas-solid phase reaction process or a liquid-solid phase reaction process.

[0003] Fluidized bed has the advantages of energy saving and environmental protection. In recent years, it has been widely used in many industries and has become the main type of drying equipment, mainly used for drying granular and powdered materials, such as monosodium glutamate processing, sugar, salt, and various tablet particles in the pharmaceutical field.

[0004] For solid particles in the fluidized bed to reach a fluidized state, the air flow rate needs to reach at least the critical fluidization velocity. The critical fluidization velocity is related to the size and weight of the solid particles. Therefore, when the solid particles to be dried change, the fluidized bed needs to adjust the critical fluidization velocity, affecting production efficiency. Utility Model Content

[0005] The utility model aims to provide a feed adaptive fluidized bed with a material concentration sensing system to solve at least one of the above technical problems.

[0006] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0007] A feed adaptive fluidized bed with a material concentration sensing system comprises a fluidizing plate and a fan, wherein the fan has a wind speed control interface for controlling the wind speed, a material layer is provided on the fluidizing plate, which is called a bed layer, and at least one set of material concentration sensing systems is provided on both sides of the fluidizing plate in the direction of the material outlet;

[0008] The material concentration sensing system includes a group of laser emitting devices and laser receiving devices that cooperate with each other;

[0009] The laser emitting device is arranged on one side of the fluidizing plate, and the emitting direction passes through the bed layer on the fluidizing plate and then toward the laser receiving device;

[0010] The laser receiving device includes a mounting substrate, on which a photosensitive device for receiving the laser irradiation intensity is arranged;

[0011] The laser receiving device is arranged on the other side of the fluidizing plate, and the receiving direction faces the emitting direction of the laser emitting device;

[0012] The laser receiving device also includes an output interface for outputting the strength of the received signal, and the output interface is connected to the wind speed control interface;

[0013] A beam expander is also provided in front of the laser emitting device. The laser beam emitted by the laser emitting device is aligned with the input port of the beam expander, and the output port of the beam expander is directed toward the photosensitive device on the other side of the fluidizing plate.

[0014] The laser receiving device also includes a light diffusion mask with a light diffusion function. The light diffusion mask is hemispherical and is shielded on the mounting substrate. The photosensitive device is located at the center of the circle formed by the light diffusion mask on the mounting substrate.

[0015] In this design, a material concentration sensing system is set up on both sides of the fluidized bed. The laser beam has high brightness and strong penetration ability for air-suspended particles, which can be used to detect material concentration. The function of the material concentration sensing system is to detect the state of the material on the bed. When the fluidized bed is not working, the material is piled on the fluidizing plate, and the particles do not move, showing a solid state. Therefore, the signal strength received by the laser receiving device is low, or even no laser light is received, and then the output interface drives the fan to increase the wind speed;

[0016] As the wind speed reaches the critical fluidization speed, the solid particles on the bed are lifted by the airflow and begin to fluidize. At this time, the particles move away from each other and move in the airflow. The greater the airflow, the greater the distance between the particles. Therefore, the signal strength received by the laser receiving device gradually increases, and the output interface drives the fan to reduce the wind speed.

[0017] The laser beam emitted by the laser emitting device is poorly diffused, and the material concentration is the proportion of the area occupied by particles per unit area. Therefore, the area penetrated by a highly concentrated laser beam is limited. It is necessary to use a beam expander to expand the diameter of the beam so that it has a larger penetration area and achieve the purpose of detecting material concentration.

[0018] After the beam expansion laser passes through the air-suspended particles, its projection surface presents a circular surface with uncertain light and dark. If it falls directly on the photosensitive device, it may detect a light signal or a dark signal, and it will not achieve the effect of comprehensive brightness. However, if a diffuse light mask is added in front of the photosensitive device, the diffuse light function of the diffuse light mask will be used to form a comprehensive light intensity after the light of the light and dark projection passes through the diffuse light mask. If the material concentration is high and the laser transmittance is low, the comprehensive light intensity will be low; if the material concentration is low and the laser transmittance is high, the comprehensive light intensity will be high. The sensory device detects the light behind the diffuse light mask and can accurately judge the material concentration.

[0019] The beneficial effect of the above design is that by detecting the material density, it is possible to indirectly determine whether the solid particles have entered the fluidized state. If the particles have not entered the fluidized state, the output interface adjusts the fan to increase the wind speed. When the fan speed is too high and the solid particles enter the turbulent state, the signal strength received by the passive receiving device is too strong, and the output interface adjusts the fan to reduce the wind speed. Then, by detecting the material concentration, the solid particles of different feeds are kept in a fluidized working state at all times, thereby achieving the goal of adaptive feeding.

[0020] For further optimization, the diffuser shield adopts a polycarbonate frosted spherical cover.

[0021] The fluidized bed is in a state of high temperature and high humidity when working. The solid particles in the bed are in violent motion under the action of the airflow. Some materials are also corrosive. The polycarbonate frosted spherical cover is characterized by high hardness, good wear resistance, and resistance to chemical corrosion. Therefore, it is suitable for making a diffuse light shield inside the fluidized bed.

[0022] For further optimization, a reflective aluminum film is also affixed to the mounting substrate in the inner area of ​​the diffuser hood.

[0023] A reflective aluminum film is attached to the mounting surface of the photosensitive device, and the light reflected by the diffuser mask can be reflected back and forth between the reflective aluminum film and the inner side of the diffuser mask, which has the beneficial effect of increasing the light intensity.

[0024] The utility model adjusts the wind speed of the fan by detecting the material concentration to adapt to different feed materials and automatically adjusts to reach the required critical fluidization speed. The beneficial effect is that the downtime is shortened and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 is a schematic front view of a fluidized bed;

[0027] Figure 2 It is a schematic diagram of the material concentration sensing system in the fluidized bed.

[0028] Explanation of symbols:

[0029] 1. Feed port; 2. Discharge port; 3. Material recovery port; 4. Air inlet; 5. Fluidizing plate; 6. Bed layer; 7. Laser emitting device; 8. Laser receiving device; 9. Fan; 10. Air outlet. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Reference Figure 1 , Figure 2 As shown, the feed adaptive fluidized bed with a material concentration sensing system includes a fluidizing plate 5 and a fan 9, the fan 9 has a wind speed control interface for controlling the wind speed, and there is a material layer on the fluidizing plate 5, which is called a bed layer 6. At least one set of material concentration sensing systems is arranged on both sides of the fluidizing plate 5 toward the discharge port;

[0035] The material concentration sensing system includes a group of laser emitting devices 7 and laser receiving devices 8 that cooperate with each other;

[0036] The laser emitting device 7 is arranged on one side of the fluidizing plate 5, and the emitting direction passes through the bed layer 6 on the fluidizing plate 5 and then toward the laser receiving device 8;

[0037] The laser receiving device 8 includes a mounting substrate, on which a photosensitive device for receiving the laser irradiation intensity is arranged;

[0038] The laser receiving device 8 is arranged on the other side of the fluidizing plate 5, and the receiving direction is toward the emitting direction of the laser emitting device 7;

[0039] The laser receiving device 8 also includes an output interface for outputting the strength of the received signal, and the output interface is connected to the wind speed control interface;

[0040] A beam expander is also provided in front of the laser emitting device 7. The laser beam emitted by the laser emitting device 7 is aligned with the input port of the beam expander, and the output port of the beam expander is directed toward the photosensitive device on the other side of the fluidizing plate 5.

[0041] The laser receiving device 8 also includes a light diffusion mask with a light diffusion function. The light diffusion mask is hemispherical and is shielded on the mounting substrate. The photosensitive device is located at the center of the circle formed by the light diffusion mask on the mounting substrate.

[0042] In this embodiment, the fluidized bed has a feed port 1. After the solid particulate material enters from the feed port 1, it accumulates on the fluidizing plate 5 with an open bottom. The fluidized bed also has an air inlet 4. The airflow of the air inlet 4 flows in from the bottom of the fluidizing plate 5 and flows out from the air outlet 10, driving the solid particles into a fluidized state. The particles that are too light or too heavy are recovered from the material recovery port 3, and the finished product after drying flows out from the discharge port 2.

[0043] A material concentration sensing system is set up on both sides of the fluidized bed. The laser beam has high brightness and strong penetration ability for air-suspended particles, and can be used to detect material concentration. The function of the material concentration sensing system is to detect the state of the material on the bed layer 6. When the fluidized bed is not working, the material is accumulated on the fluidizing plate 5, and the particles do not move and appear to be solid. Therefore, the signal strength received by the laser receiving device 8 is low, or even no laser light is received, and then the output interface drives the fan 9 to increase the wind speed;

[0044] As the wind speed reaches the critical fluidization speed, the solid particles on the bed 6 are lifted by the airflow and begin to fluidize. At this time, the particles move away from each other and move in the airflow. The greater the airflow, the greater the distance between the particles. Therefore, the signal strength received by the laser receiving device 8 gradually increases, and then the output interface drives the fan 9 to reduce the wind speed.

[0045] The laser beam emitted by the laser emitting device 7 is poorly diffused, and the material concentration is the proportion of the area occupied by particles per unit area. Therefore, the area penetrated by the highly concentrated laser beam is limited. It is necessary to use a beam expander to expand the diameter of the beam so that it has a larger penetration area to achieve the purpose of detecting the material concentration.

[0046] After the beam expansion laser passes through the air-suspended particles, its projection surface presents a circular surface with uncertain light and dark. If it falls directly on the photosensitive device, it may detect a light signal or a dark signal, and it will not achieve the effect of comprehensive brightness. However, if a diffuse light mask is added in front of the photosensitive device, the diffuse light function of the diffuse light mask will be used to form a comprehensive light intensity after the light of the light and dark projection passes through the diffuse light mask. If the material concentration is high and the laser transmittance is low, the comprehensive light intensity will be low; if the material concentration is low and the laser transmittance is high, the comprehensive light intensity will be high. The sensory device detects the light behind the diffuse light mask and can accurately judge the material concentration.

[0047] The beneficial effect of the above design is that by detecting the material density, it is possible to indirectly determine whether the solid particles have entered the fluidized state. If the particles have not entered the fluidized state, the output interface adjusts the fan 9 to increase the wind speed. When the wind speed of the fan 9 is too high and causes the solid particles to enter the turbulent state, the signal strength received by the passive receiving device is too strong, and the output interface adjusts the fan 9 to reduce the wind speed. Then, by detecting the material concentration, the solid particles of different feeds are kept in a fluidized working state at all times, thereby achieving the goal of adaptive feeding.

[0048] The diffuser cover is a frosted polycarbonate spherical cover.

[0049] The fluidized bed is in a high temperature and high humidity state when working. The solid particles in the bed layer 6 are in violent motion under the action of the airflow. Some materials are also corrosive. The polycarbonate frosted spherical cover is characterized by high hardness, good wear resistance, and resistance to chemical corrosion. Therefore, it is suitable for making a diffuse light shield inside the fluidized bed.

[0050] A reflective aluminum film is also attached to the mounting base plate in the inner area of ​​the diffuser cover.

[0051] A reflective aluminum film is attached to the mounting surface of the photosensitive device, and the light reflected by the diffuser mask can be reflected back and forth between the reflective aluminum film and the inner side of the diffuser mask, which has the beneficial effect of increasing the light intensity.

[0052] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0053] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A feed adaptive fluidized bed with a material concentration sensing system includes a fluidizing plate and a fan, the fan has a wind speed control interface for controlling the wind speed, and there is a material layer on the fluidizing plate, which is called a bed layer, and is characterized in that: At least one set of material concentration sensing systems is arranged on both sides of the fluidizing plate in the direction of the material outlet; The material concentration sensing system includes a group of laser emitting devices and laser receiving devices that cooperate with each other; The laser emitting device is arranged on one side of the fluidizing plate, and the emitting direction passes through the bed layer on the fluidizing plate and then toward the laser receiving device; The laser receiving device includes a mounting substrate, on which a photosensitive device for receiving the laser irradiation intensity is arranged; The laser receiving device is arranged on the other side of the fluidizing plate, and the receiving direction faces the emitting direction of the laser emitting device; The laser receiving device also includes an output interface for outputting the strength of the received signal, and the output interface is connected to the wind speed control interface; A beam expander is also provided in front of the laser emitting device. The laser beam emitted by the laser emitting device is aligned with the input port of the beam expander, and the output port of the beam expander is directed toward the photosensitive device on the other side of the fluidizing plate. The laser receiving device also includes a diffuse light shield with diffuse light function. The diffuse light shield is hemispherical and shielded on the mounting substrate. The photosensitive device is located at the center of the circle formed by the diffuse light shield on the mounting substrate. The diffuse light shield adopts a polycarbonate frosted spherical cover.

2. The feed adaptive fluidized bed with material concentration sensing system according to claim 1, characterized in that: A reflective aluminum film is also attached to the mounting base plate in the inner area of ​​the diffuser cover.

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