Fluidized bed constant humidity control system

Abstract

The invention provides a fluidized bed constant humidity control system, which comprises a pure steam generation system, a rotary dehumidifier and fluidized bed equipment, and is characterized in that a pure steam generation pipeline of the pure steam generation system is connected to an inlet pipeline of the fluidized bed equipment and is used for humidifying gas in the inlet pipeline; an air supply outlet of the rotary dehumidifier is connected into an inlet pipeline of the fluidized bed equipment and used for dehumidifying gas in the inlet pipeline, the fluidized bed constant humidity control system further comprises a PLC control system, and the PLC control system is used for monitoring and dynamically adjusting operation parameters of the rotary dehumidifier and the pure steam generation system in real time. And the internal humidity of the fluidized bed is maintained in a set range through closed-loop control. According to the system, the pure steam generation system and the rotary dehumidifier are integrated, and the PLC is adopted for intelligent control, so that precise humidity regulation and control of the fluidized bed process environment are realized. And the dehumidification and humidification processes are coordinated in real time through a PLC closed-loop control algorithm, so that the internal humidity of the fluidized bed is stably maintained within a set value range.

Description

Technical Field

[0001] The invention relates to the technical field of pure steam production, and in particular to a fluidized bed constant humidity control system. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] Fluidized bed technology is widely used in the granulation, coating and drying processes of the pharmaceutical, food, chemical and other industries. Humidity control of the process environment is one of the key factors affecting product quality. In the prior art, fluidized bed humidity control mainly has the following technical defects: Traditional humidity control systems mostly use a single humidification or dehumidification method, such as steam humidification or rotary dehumidification, which makes it difficult to achieve wide-range, high-precision humidity regulation. Especially when processing high-humidity raw materials or processes that require rapid humidity switching, there are often problems of lag in regulation and large fluctuations, resulting in uneven moisture content in the product, affecting product quality stability.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a pure steam generating system.

[0006] In order to solve the above-mentioned technical problems, the present application provides a fluidized bed constant humidity control system, including a pure steam generation system, a rotary dehumidifier and a fluidized bed device, wherein the pure steam generation pipeline of the pure steam generation system is connected to the inlet pipeline of the fluidized bed device, so as to humidify the gas in the inlet pipeline; the air supply port of the rotary dehumidifier is connected to the inlet pipeline of the fluidized bed device, so as to dehumidify the gas in the inlet pipeline, and the fluidized bed constant humidity control system also includes a PLC control system, which is used to monitor and dynamically adjust the operating parameters of the rotary dehumidifier and the pure steam generation system in real time, so as to maintain the internal humidity of the fluidized bed within a set range through closed-loop control.

[0007] Preferably, the pure steam generating system comprises a purified water supply device, a first evaporation device, a second evaporation device and a pure steam collecting device. The purified water supply device is connected to the first evaporation device through a first pipeline, the first evaporation device is connected to the second evaporation device through a second pipeline, the second evaporation device is connected to the pure steam collecting device through a third pipeline, and the water in the purified water supply device passes through the first evaporation device and the second evaporation device in sequence, and the formed pure steam is collected by the pure steam collecting device. The pure steam generating system also comprises an industrial steam providing device, and the industrial steam providing device is used to provide a heat source for the first evaporation device and the second evaporation device.

[0008] Preferably, the industrial steam providing device is connected to the second evaporation device through a fourth pipe, the first evaporation device is connected to the fourth pipe through a fifth pipe, the condensate outlet of the first evaporation device is connected to the second evaporation device through a sixth pipe, and the condensate of the second evaporation device is discharged through a seventh pipe, and the first evaporation device and the second evaporation device are in a tube-in-tube mode.

[0009] Preferably, the second evaporation device comprises a preheating chamber, a separation chamber located on the upper side of the preheating chamber, and a separation filter located on the upper side of the separation chamber, wherein the preheating chamber is used to further heat the pre-concentrated water from the first evaporation device; the separation chamber is used to separate the water and steam passing through the preheating chamber; the separation filter is used to filter impurities in the steam, and the preheating chamber of the second evaporation device is also equipped with a liquid level meter, wherein the liquid level meter has an upper liquid level and a lower liquid level, wherein the upper liquid level is 14L and the lower liquid level is 9L.

[0010] Preferably, the second pipeline is also connected to an eighth pipeline, and the second pipeline is used to discharge the concentrated water in the first evaporation device and the second evaporation device. The first pipeline is also connected to a fourteenth pipeline, and the fourteenth pipeline is used to discharge high-temperature water.

[0011] Preferably, the fourth pipeline is provided with a Y-type filter, a stop valve, a pneumatic proportional control valve and a safety valve in sequence in the direction of travel of the industrial steam. The Y-type filter is used to filter impurities in the industrial steam; the stop valve is used to control the on and off of the industrial steam; the pneumatic proportional control valve is used to adjust the flow and pressure of the industrial steam; and the safety valve is used for overpressure protection.

[0012] Preferably, the pure steam generating system further comprises a sampling device, wherein the sampling device comprises a cooling chamber, wherein the cooling chamber is connected to the third pipe via a ninth pipe, and the steam in the third pipe forms a water sample after passing through the cooling chamber.

[0013] Preferably, the cooling chamber is connected to the eleventh pipe and the twelfth pipe, and the cooling water enters the cooling chamber through the twelfth pipe and flows out from the eleventh pipe. The cooling chamber is also connected to the tenth pipe, and the cooled water sample flows out through the tenth pipe.

[0014] Preferably, the pure steam generating system further comprises a back-blowing device, wherein the back-blowing device is connected to the first pipeline via a thirteenth pipeline, and the back-blowing device is used to blow compressed air through each pipeline and the first evaporation device and the second evaporation device.

[0015] Preferably, the rotary dehumidifier comprises an outer shell, the outer shell has an air inlet and an air outlet, and the inner shell is provided with a medium-efficiency filter, a surface cooler, a water accumulation tray, a water retaining curtain, and a dehumidification wheel in sequence, the dehumidification wheel comprises a dehumidification wheel body, a regeneration fan, a regeneration heating box and a reducer, the medium-efficiency filter is used to filter impurities such as dust and particulate matter in the air; the surface cooler is used to reduce the temperature of the air by cooling the air, so as to cause the water vapor in the air to condense into water droplets; the water accumulation tray is used to collect the condensed water condensed by the surface cooler and discharge it through the drainage system; the water retaining curtain is used to prevent the condensed water droplets or impurities carried by the air from entering the dehumidification wheel; the regeneration fan is used to drive the regeneration air flow, and send the heated air into the regeneration zone of the dehumidification wheel to discharge the moisture adsorbed by the dehumidification wheel body; the reducer is used to control the rotation speed of the dehumidification wheel; the regeneration heating box is used to heat the regeneration air to take away the moisture adsorbed by the dehumidification wheel body in the regeneration zone, so as to complete the regeneration cycle of the dehumidification wheel.

[0016] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0017] A fluidized bed constant humidity control system of the present invention realizes precise humidity control of the fluidized bed process environment by integrating a pure steam generation system and a rotary dehumidifier and adopting PLC intelligent control. The dehumidification and humidification processes are coordinated in real time through the PLC closed-loop control algorithm, so that the humidity inside the fluidized bed is stably maintained within the set value range, thereby improving the stability of the product process. In addition, the fluidized bed constant humidity control system of the present application realizes wide-range rapid adjustment through the pure steam generation system and the rotary dehumidifier, and the response time is greatly shortened. The pure steam generation system of the present application realizes two-stage evaporation purification of purified water through the series design of the first evaporation device and the second evaporation device, effectively removes impurities and pyrogens, and the steam finally generated reaches a high purity standard, meeting the needs of industries such as medicine and electronics that are sensitive to steam purity. The industrial steam supply device serves as a shared heat source to provide thermal energy for the two-stage evaporation device, optimizes heat distribution through graded evaporation, and reduces overall energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of the pure steam generation system of the present application.

[0019] Figure 2 It is a structural schematic diagram of the rotary dehumidifier of the present application.

[0020] Figure 3 It is a structural schematic diagram of the fluidized bed constant humidity control system of the present application.

[0021] Among them: 1. Separation filter; 2. Separation chamber; 3. Preheating chamber; 4. Liquid level meter; 41. Lower liquid level; 42. Upper liquid level; 5. Evaporation chamber; 6. Cooling chamber; 71. First pipeline; 72. Second pipeline; 73. Third pipeline; 74. Fourth pipeline; 75. Fifth pipeline; 76. Sixth pipeline; 77. Seventh pipeline; 78. Eighth pipeline; 79. Ninth pipeline; 710. Tenth pipeline; 711. Eleventh pipeline; 712. Twelfth pipeline; 713. Thirteenth pipeline; 714. Fourteenth pipeline; 81. Y-type filter; 82. Stop valve; 83. Pneumatic proportional control valve; 84. Safety valve;

[0022] 01. Medium efficiency filter; 02. Surface cooler; 03. Water collection tray; 04. Water retaining curtain; 05. Regeneration fan; 06. Reducer; 07. Dehumidification wheel; 08. Regeneration heating box. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] like Figure 3 As shown, the fluidized bed constant humidity control system of the present application includes a pure steam generation system, a rotary dehumidifier and a fluidized bed device. In addition, the fluidized bed constant humidity control system of the present application also includes a PLC control system.

[0026] like Figure 1As shown, the present invention provides a pure steam generation system, including a purified water supply device, a first evaporation device, a second evaporation device and a pure steam collection device, wherein the purified water supply device is connected to the first evaporation device through a first pipe 71, the first evaporation device is connected to the second evaporation device through a second pipe 72, and the second evaporation device is connected to the pure steam collection device through a third pipe 73. After the water in the purified water supply device passes through the first evaporation device and the second evaporation device in sequence, the pure steam formed is collected by the pure steam collection device, and the pure steam generation system also includes an industrial steam supply device, which is used to provide a heat source for the first evaporation device and the second evaporation device. A pure steam generation system of the present invention realizes two-stage evaporation purification of purified water through the series design of the first evaporation device and the second evaporation device, effectively removes impurities and pyrogens, and finally generates steam that reaches a high purity standard, meeting the needs of industries such as medicine and electronics that are sensitive to steam purity. The industrial steam supply device, as a shared heat source, provides heat energy for the two-stage evaporation device, optimizes heat distribution through graded evaporation, and reduces overall energy consumption.

[0027] The industrial steam supply device is connected to the second evaporation device through the fourth pipeline 74, the first evaporation device is connected to the fourth pipeline 74 through the fifth pipeline 75, the condensed water outlet of the first evaporation device is connected to the second evaporation device through the sixth pipeline 76, and the condensed water of the second evaporation device is discharged through the seventh pipeline 77. The first evaporation device and the second evaporation device are in a tube-in-tube mode. The fourth pipeline 74 is provided with a Y-type filter 81, a stop valve 82, a pneumatic proportional control valve 83 and a safety valve 84 in the direction of the industrial steam. The Y-type filter 81 is used to filter impurities in the industrial steam; the stop valve 82 is used to control the on and off of the industrial steam; the pneumatic proportional control valve 83 is used to adjust the flow and pressure of the industrial steam; the safety valve 84 is used for overpressure protection. The second pipeline 72 is also connected to the eighth pipeline 78, and the second pipeline 72 is used to discharge the concentrated water in the first evaporation device and the second evaporation device. The first pipeline 71 is also connected to the fourteenth pipeline 714, and the fourteenth pipeline 714 is used for high-temperature water discharge.

[0028] The second evaporation device includes a preheating chamber 3, a separation chamber 2 located on the upper side of the preheating chamber 3, and a separation filter 1 located on the upper side of the separation chamber 2. The preheating chamber 3 is used to further heat the pre-concentrated water from the first evaporation device; the separation chamber 2 is used to separate the water and steam passing through the preheating chamber 3; and the separation filter 1 is used to filter impurities in the steam. The preheating chamber 3 of the second evaporation device is also equipped with a liquid level meter 4, and the liquid level meter 4 has an upper liquid level 42 and a lower liquid level 41. The upper liquid level 42 is 14L, and the lower liquid level 41 is 9L. When the liquid level is lower than 9L, the system automatically replenishes water to prevent the preheating chamber 3 from drying out and protect the heating device. When the liquid level is higher than 14L, stop water intake or accelerate evaporation to prevent liquid from entering the separation chamber 2 and causing steam to carry water. The liquid level signal can be connected to the PLC control system and linked with the pneumatic proportional control valve 83 (the fourth pipeline 74) to achieve fully automatic flow regulation, which is suitable for high-standard production environments such as GMP.

[0029] The pure steam generating system further comprises a sampling device, which comprises a cooling chamber 6, wherein the cooling chamber 6 is connected to the third pipe 73 through a ninth pipe 79, and the steam in the third pipe 73 forms a water sample after passing through the cooling chamber 6. Specifically, the cooling chamber 6 is connected to the eleventh pipe 711 and the twelfth pipe 712, and the cooling water flows out from the eleventh pipe 711 after entering the cooling chamber 6 through the twelfth pipe 712, and the cooling chamber 6 is also connected to the tenth pipe 710, and the cooled water sample flows out through the tenth pipe 710. Steam is directly extracted from the pure steam output end (the third pipe 73) through the ninth pipe 79, and condensed into a liquid water sample through the cooling chamber 6, and its key indicators such as conductivity, TOC (total organic carbon), microorganisms or endotoxins can be detected at any time. The design of the sampling device makes it possible for the sampling process to not affect the flow and pressure of the main steam pipe, thereby ensuring production continuity. The sampling device can be linked to the PLC control system to realize data recording and alarm functions.

[0030] The pure steam generation system also includes a back-blowing device, which is connected to the first pipeline 71 through a thirteenth pipeline 713, and is used to blow compressed air through each pipeline and the first evaporation device and the second evaporation device. After the production is completed or when the batch is switched, the back-blowing device can quickly dry the residual moisture in the pipeline to prevent the growth of microorganisms or impurities from mixing into the next batch. It is particularly suitable for the pharmaceutical industry to avoid pyrogen contamination caused by equipment residues. The back-blowing frequency, duration and pressure can be set through the PLC control system. If the system detects an abnormal pressure difference (such as filter blockage), the back-blowing program can be automatically triggered to try to restore smoothness.

[0031] like Figure 2As shown, it is a rotary dehumidifier, which includes a shell, the shell has an air inlet and an air outlet, and the shell is provided with a medium efficiency filter 01, a surface cooler 02, a water accumulation tray 03, a water retaining curtain 04, and a dehumidification wheel 07 in sequence. The dehumidification wheel 07 includes a dehumidification wheel body, a regeneration fan 05, a regeneration heating box 08 and a reducer 06. The dehumidification process of the rotary dehumidifier is as follows: air enters from the air inlet, passes through the medium-efficiency filter 01 to remove dust and particulate matter, and then flows through the surface cooler 02 for pre-cooling, so that part of the water vapor condenses into water droplets, and the condensed water is collected and discharged by the water accumulation tray 03, and the water retaining curtain 04 prevents the water droplets from being carried into subsequent components by the air flow; then the air enters the processing area of ​​the dehumidification wheel 07, and the hygroscopic material (such as silica gel or molecular sieve) in the wheel absorbs moisture in the air, and the dried air is discharged from the air supply port; the regeneration fan 05 inhales external air, and after heating by the regeneration heating box 08, it is blown into the regeneration area of ​​the wheel, and the high-temperature airflow desorbs and discharges the moisture adsorbed by the wheel, thereby restoring the dehumidification capacity of the wheel; the reducer 06 controls the wheel to rotate slowly, so that the processing area and the regeneration area work alternately, thereby realizing a continuous and stable dehumidification process. Compared with the existing rotary dehumidifier, the rotary dehumidifier of the present application is equipped with a surface cooler 02, a water accumulation tray 03, and a water retaining curtain 04 structure, so that part of the water can be condensed first, the humidity load of the rotary wheel can be reduced, and the overall dehumidification efficiency can be improved. In addition, the water retaining curtain 04 of the present application can prevent the water droplets condensed by the surface cooler 02 from being brought into the rotary wheel by the airflow, thereby avoiding moisture or blockage of the rotary wheel. The PLC control system of the present application can monitor the humidity in real time, dynamically adjust the parameters such as the rotary wheel speed, regeneration temperature, and air volume, and ensure the stability of the outlet air humidity.

[0032] like Figure 3 As shown, the third pipeline of the pure steam generating system, i.e., the pure steam generating pipeline, is connected to the inlet pipeline of the fluidized bed equipment, and the air supply port of the rotary dehumidifier is connected to the inlet pipeline of the fluidized bed equipment. The fluidized bed constant humidity control system of the present application adopts a PLC control system, which dynamically adjusts the operating parameters of the dehumidifier and the humidification amount of the pure steam generating system by real-time monitoring of the humidity signal in the fluidized bed equipment, so that the humidity is stably maintained at a set value (such as 40% RH ± 2%). Compared with the traditional single dehumidification or humidification scheme, the fluidized bed constant humidity control system of the present application has the advantages of a wide adjustment range (10%-80% RH), fast response speed, and high control accuracy (±1% RH). It is particularly suitable for fluidized bed granulation, coating and other humidity-sensitive processes in the pharmaceutical and food industries, and achieves energy-saving operation while ensuring product quality.

[0033] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A fluidized bed constant humidity control system, characterized in that: include, A pure steam generation system, a rotary dehumidifier and a fluidized bed device, wherein the pure steam generation pipeline of the pure steam generation system is connected to the inlet pipeline of the fluidized bed device for humidifying the gas in the inlet pipeline; the air supply port of the rotary dehumidifier is connected to the inlet pipeline of the fluidized bed device for dehumidifying the gas in the inlet pipeline. The fluidized bed constant humidity control system also includes a PLC control system, which is used to monitor and dynamically adjust the operating parameters of the rotary dehumidifier and the pure steam generation system in real time, and maintain the internal humidity of the fluidized bed within a set range through closed-loop control.

2. The fluidized bed constant humidity control system according to claim 1, characterized in that: The pure steam generating system comprises: Purified water supply device, first evaporation device, second evaporation device and pure steam collection device, The purified water supply device is connected to the first evaporation device through a first pipeline, the first evaporation device is connected to the second evaporation device through a second pipeline, and the second evaporation device is connected to the pure steam collection device through a third pipeline. The water in the purified water supply device passes through the first evaporation device and the second evaporation device in sequence, and the generated pure steam is collected by the pure steam collecting device. The pure steam generating system further comprises an industrial steam providing device, and the industrial steam providing device is used to provide a heat source for the first evaporating device and the second evaporating device.

3. The fluidized bed constant humidity control system according to claim 2, characterized in that: The industrial steam supply device is connected to the second evaporation device through a fourth pipe, the first evaporation device is connected to the fourth pipe through a fifth pipe, the condensate outlet of the first evaporation device is connected to the second evaporation device through a sixth pipe, and the condensate of the second evaporation device is discharged through a seventh pipe. The first evaporation device and the second evaporation device are in a tube-in-tube mode.

4. The fluidized bed constant humidity control system according to claim 3, characterized in that: The second evaporation device comprises a preheating chamber, a separation chamber located on the upper side of the preheating chamber, and a separation filter located on the upper side of the separation chamber. The preheating chamber is used to further heat the pre-concentrated water from the first evaporation device; the separation chamber is used to separate the water and steam passing through the preheating chamber; the separation filter is used to filter impurities in the steam. The preheating chamber of the second evaporation device is also equipped with a liquid level meter, and the liquid level meter has an upper liquid level and a lower liquid level. The upper liquid level is 14L, and the lower liquid level is 9L.

5. The fluidized bed constant humidity control system according to claim 4, characterized in that: The second pipeline is also connected to an eighth pipeline, and the second pipeline is used to discharge the concentrated water in the first evaporation device and the second evaporation device. The first pipeline is also connected to a fourteenth pipeline, and the fourteenth pipeline is used to discharge high-temperature water.

6. The fluidized bed constant humidity control system according to claim 4, characterized in that: The fourth pipeline is provided with a Y-type filter, a stop valve, a pneumatic proportional control valve and a safety valve in sequence in the direction of travel of the industrial steam. The Y-type filter is used to filter impurities in the industrial steam; the stop valve is used to control the on and off of the industrial steam; the pneumatic proportional control valve is used to adjust the flow and pressure of the industrial steam; and the safety valve is used for overpressure protection.

7. The fluidized bed constant humidity control system according to claim 6, characterized in that: The pure steam generating system further comprises a sampling device, wherein the sampling device comprises a cooling chamber, wherein the cooling chamber is connected to the third pipe via a ninth pipe, and the steam in the third pipe forms a water sample after passing through the cooling chamber.

8. The fluidized bed constant humidity control system according to claim 7, characterized in that: The cooling chamber is connected to the eleventh pipe and the twelfth pipe, and the cooling water enters the cooling chamber through the twelfth pipe and flows out from the eleventh pipe. The cooling chamber is also connected to the tenth pipe, and the cooled water sample flows out through the tenth pipe.

9. The fluidized bed constant humidity control system according to claim 8, characterized in that: The pure steam generating system further comprises a back-blowing device, which is connected to the first pipeline via a thirteenth pipeline, and is used for blowing compressed air through each pipeline and the first evaporation device and the second evaporation device.

10. The fluidized bed constant humidity control system according to claim 1, characterized in that: The rotary dehumidifier comprises a shell, the shell has an air inlet and an air outlet, and the shell is provided with a medium efficiency filter, a surface cooler, a water accumulation tray, a water retaining curtain, and a dehumidification wheel in sequence, and the dehumidification wheel comprises a dehumidification wheel body, a regeneration fan, a regeneration heating box and a reducer. The medium efficiency filter is used to filter impurities such as dust and particulate matter in the air; The surface cooler is used to cool the air to lower its temperature, thereby causing the water vapor in the air to condense into water droplets; The water collection pan is used to collect condensed water from the surface cooler and discharge it through the drainage system; The water retaining curtain is used to prevent condensed water droplets or impurities carried by the air from entering the dehumidification wheel; The regeneration fan is used to drive the regeneration air flow, and send the heated air into the regeneration area of ​​the dehumidification wheel to discharge the moisture adsorbed by the dehumidification wheel body; The reducer is used to control the rotation speed of the dehumidification wheel; The regeneration heating box is used to heat the regeneration air to take away the moisture adsorbed by the dehumidification wheel body in the regeneration area, thereby completing the regeneration cycle of the dehumidification wheel.

Images