Temperature control method, system, equipment and medium for falling film crystallizer

Abstract

The present invention discloses a temperature control method, system, equipment, and medium for a falling film crystallizer. The temperature control method for the falling film crystallizer includes: obtaining the crystallization state of the material to be processed in the falling film crystallizer; if the crystallization state indicates that a crystal nucleus has been formed, controlling the first cooling medium to increase the temperature at a first preset rate based on the first inlet temperature, and controlling the second cooling medium to decrease the temperature at a second preset rate based on the second inlet temperature; obtaining a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium; if the first real-time temperature is equal to the second real-time temperature, controlling the first cooling medium and the second cooling medium to decrease the temperature at a third preset rate until a preset temperature threshold is reached. The present application improves equipment utilization.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control technology, and in particular to a temperature control method, system, equipment and medium for a falling film crystallizer. Background Art

[0002] Falling film crystallization occurs when a solution undergoes falling film motion. During the crystallization process, both the solution and the cooling medium on both sides of the crystallization wall exhibit a falling film motion. Falling film crystallization has the advantages of being solvent-free, non-toxic, low energy consumption, and high separation efficiency.

[0003] Conventional falling film crystallizers typically use a single temperature reducer or cooler to lower the solution temperature, promoting crystallization of the solute. However, using traditional falling film crystallizers for crystallization has drawbacks such as low crystallization efficiency, a long crystallization process, high energy consumption, poor crystallization purification results, and low product purity.

[0004] In order to solve the above technical problems, the applicant has developed a falling film crystallizer with a pre-crystallization section on the upper part. The specific structure is detailed in Figure 1 However, when using this falling film crystallizer for falling film crystallization, after the crystal nucleus is formed, crystallization is only carried out through the middle crystallization section, that is, the upper pre-crystallization section no longer plays a corresponding role, and the equipment utilization rate is low. At the same time, due to the rapid cooling of the pre-crystallization section, a small amount of impurities are inevitably present in the formed crystal nucleus, resulting in low product purity. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a temperature control method, system, equipment and medium for a falling film crystallizer to solve the technical problems of low equipment utilization and low product purity in the prior art.

[0006] In a first aspect, the present invention provides a temperature control method for a falling film crystallizer, the temperature control method being used to control the temperature of a cooling medium in a cooling medium pipeline connected to cooling medium inlets at the upper portion and the middle portion of the falling film crystallizer, the temperature control method comprising:

[0007] Obtaining a crystallization state of the material to be processed in the falling film crystallizer, wherein the crystallization state includes the formation of crystal nuclei;

[0008] If the crystallization state is that crystal nuclei have been formed, controlling the first cooling medium to increase in temperature at a first preset rate based on a first inlet temperature, and controlling the second cooling medium to decrease in temperature at a second preset rate based on a second inlet temperature, wherein the first inlet temperature is lower than the second inlet temperature, the first cooling medium and the second cooling medium are cooling media in cooling medium pipes connected to the upper and middle cooling medium inlets of the falling film crystallizer, respectively, and the first inlet temperature and the second inlet temperature are temperatures of the first cooling medium and the second cooling medium when they enter the upper and middle cooling medium inlets of the falling film crystallizer, respectively;

[0009] Acquire a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium;

[0010] If the first real-time temperature is equal to the second real-time temperature, the first cooling medium and the second cooling medium are controlled to cool down at a third preset rate until a preset temperature threshold is reached, the third preset rate is greater than the first preset rate and the second preset rate, and the preset temperature threshold is less than the first inlet temperature.

[0011] In an exemplary embodiment of the present application, the first inlet temperature is the same as the actual crystallization start temperature of the target product.

[0012] In an exemplary embodiment of the present application, the second inlet temperature is the same as the theoretical crystallization start temperature of the target product.

[0013] In an exemplary embodiment of the present application, the first preset rate is 0.2-0.3° C. / min.

[0014] In an exemplary embodiment of the present application, the second preset rate is 0.1-0.18°C / min.

[0015] In an exemplary embodiment of the present application, the third preset rate is 0.3-0.5° C. / min.

[0016] In a second aspect, the present application further provides a cooling medium temperature control system, the temperature control system being used to control the temperature of the cooling medium in the cooling medium pipelines connected to the cooling medium inlets at the upper and middle portions of the falling film crystallizer, the temperature control system comprising:

[0017] a crystallization state acquisition module configured to obtain the crystallization state of the material to be processed in the falling film crystallizer, wherein the crystallization state includes the formation of crystal nuclei;

[0018] a first control module, if the crystallization state is that crystal nuclei have been formed, configured to control the first cooling medium to increase in temperature at a first preset rate based on a first inlet temperature, and to control the second cooling medium to decrease in temperature at a second preset rate based on a second inlet temperature, wherein the first inlet temperature is lower than the second inlet temperature, the first cooling medium and the second cooling medium are cooling media in cooling medium pipes connected to the upper and middle cooling medium inlets of the falling film crystallizer, respectively, and the first inlet temperature and the second inlet temperature are temperatures of the first cooling medium and the second cooling medium when they enter the upper and middle cooling medium inlets of the falling film crystallizer, respectively;

[0019] A real-time temperature acquisition module is configured to acquire a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium;

[0020] The second control module is configured to control the first cooling medium and the second cooling medium to cool down at a third preset rate until a preset temperature threshold is reached if the first real-time temperature is equal to the second real-time temperature, and the preset temperature threshold is less than the first inlet temperature.

[0021] In a third aspect, the present application further provides an electronic device, comprising:

[0022] one or more processors;

[0023] A storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the electronic device implements the temperature control method of the falling film crystallizer as described above.

[0024] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor of a computer, enables the computer to execute the temperature control method of the falling film crystallizer as described above.

[0025] As described above, the temperature control method, system, device and medium of the falling film crystallizer of the present invention have the following beneficial effects:

[0026] The present application obtains the crystallization state of the material to be processed in the falling film crystallizer. If the crystallization state is that a crystal nucleus has been formed, the first cooling medium is controlled to increase the temperature at a first preset rate based on the first inlet temperature, and the second cooling medium is controlled to decrease the temperature at a second preset rate based on the second inlet temperature, to obtain the first real-time temperature of the first cooling medium and the second real-time temperature of the second cooling medium. If the first real-time temperature is equal to the second real-time temperature, the first cooling medium and the second cooling medium are controlled to decrease the temperature at a third preset rate until the preset temperature threshold, that is, the pre-crystallization stage is first heated and then cooled. On the one hand, it can slightly dissolve the large-volume crystal nucleus, which is the same as the sweating effect, which is equivalent to the first sweating of the crystal nucleus. This is beneficial to remove impurities in the large-volume crystal nucleus, thereby improving the purity of the crystal nucleus. Since the pre-crystallization stage has initially formed a crystal nucleus, which is a rapid nucleation, a small amount of impurities are inevitably wrapped in the crystal nucleus. Slightly increasing the temperature can sweat out part of these impurities in the crystal nucleus, preventing the impurities wrapped in the nucleation stage from being too deeply wrapped in the later crystal growth stage and difficult to be discharged in the subsequent sweating process. On the other hand, under the same slightly elevated temperature conditions, large nuclei partially melt, with their volume remaining virtually unchanged. Only the edge spikes melt, achieving consistent morphology across different nuclei. Under the same slightly elevated temperature conditions, small nuclei completely melt, preventing the precipitation of new nuclei. At this point, the material consists almost exclusively of nuclei of uniform size. Consequently, crystals subsequently grown from these nuclei are uniform in size, improving product quality and purity. Furthermore, by fully utilizing the pre-crystallization stage, the surface area of ​​the crystallization stage is increased, further improving utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and a person of ordinary skill in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0028] Figure 1 A schematic structural diagram of a falling film crystallizer is shown as an exemplary embodiment of the present application;

[0029] Figure 2 for Figure 1 Assembly drawing of the central distribution plate, guide vane and crystallization tube;

[0030] Figure 3 for Figure 1 Expanded view of the center deflector;

[0031] Figure 4 This is a flow chart of a temperature control method for a falling film crystallizer shown as an exemplary embodiment of the present application;

[0032] Figure 5 A block diagram of a temperature control system for a cooling medium according to an exemplary embodiment of the present application is shown;

[0033] Figure 6 A schematic diagram of the structure of a computer system suitable for implementing an electronic device according to an embodiment of the present application is shown.

[0034] Reference numerals

[0035] 11-feed port, 111-distributor, 12-discharge port, 13-crystallization tube, 131-membrane head, 14-top plate, 15-cooling medium inlet, 16-distribution plate, 161-flow guide, 1611-flow guide inlet, 1612-flow guide outlet, 1613-flow guide channel, 17-cooling medium outlet, 18-crystallization tube splint. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0037] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0038] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring the embodiments of the present invention.

[0039] First, it should be noted that conventional falling-film crystallizers typically use a single cooler or chiller to lower the solution temperature, promoting crystallization of the solute in the feed solution. However, using conventional falling-film crystallizers for crystallization has drawbacks such as low crystallization efficiency, a long crystallization process, high energy consumption, poor crystallization purification results, and low product purity.

[0040] In order to solve the above technical problems, the applicant has developed a falling film crystallizer with a pre-crystallization section on the upper part. The specific structure is detailed in Figure 1 The falling film crystallizer includes a cylinder, a feed port 11 is provided at the top of the cylinder, a discharge port 12 is provided at the bottom of the cylinder, a distributor 111 is provided inside the feed port 11, the feed port 11 is connected to a distribution pipe network, and a pre-crystallization section and a crystallization section are sequentially provided between the feed port 11 and the discharge port 12. A plurality of crystallization tubes 13 are provided inside the cylinder, all of which are arranged vertically, a feed liquid inlet is provided at the top of the crystallization tube 13, a discharge port is provided at the bottom of the crystallization tube 13, and a plurality of liquid separation heads corresponding one to one with the crystallization tube 13 are provided in the distribution pipe network. A film distribution head 131 is provided inside the cylinder, and the film distribution head 131 is located between the liquid separation head and the crystallization tube 13. The film distribution head 131 corresponds one to one with the crystallization tube 13 and is connected. A top plate 14 is provided between the pre-crystallization section and the feed port 11. The top plate 14 is arranged horizontally and is used to fix the crystallization tube 13. The top plate 14 is provided with a plurality of through holes corresponding one to one with the crystallization tube 13. The diameter of the through holes is slightly larger than the outer diameter of the crystallization tube 13. The top plate 14 is sleeved on the outside of the crystallization tube 13 through the through holes so that the crystallization tube 13 is fixed to the inner wall of the cylinder through the top plate 14. The pre-crystallization section and the crystallization section are provided with a cooling medium inlet 15, a distribution plate 16, a cooling medium outlet 17 and a crystallization tube clamp 18 in sequence from top to bottom. The crystallization section is provided with a plurality of parallel distribution plates 16. All distribution plates 16 are arranged horizontally. A plurality of flow guides 161 are fixedly provided on the distribution plates 16. All flow guides 161 correspond one to one with the crystallization tube 13 and are sleeved on the outside of the corresponding crystallization tube 13. The guide 161 is annular and circumferentially arranged with several inlets 1611, outlets 1612, and an S-shaped channel 1613. The ends of the channel 1613 are tangentially connected to the corresponding inlets 1611 and outlets 1612. The inlets 1611 are 2-8 mm wide and 2-8 mm high, located above the outlets 1612. The outlets 1612 are fixed to the distribution plate 16 through holes in the distribution plate 16. The crystallization tube clamping plate 18 is located below the cooling medium outlet 17 in the corresponding area. The crystallization tube clamping plate 18 has several through-holes corresponding to the crystallization tubes 13. The diameter of the through-holes is slightly larger than the outer diameter of the crystallization tubes 13. The crystallization tube clamping plate 18 is mounted on the outside of the crystallization tubes 13 through the through-holes, so that the crystallization tubes 13 are fixed to the inner wall of the cylinder through the crystallization tube clamping plate 18.

[0041] However, when using the falling film crystallizer for falling film crystallization, after the crystal nucleus is formed, crystallization is only carried out through the middle crystallization section, that is, the upper pre-crystallization section no longer plays a corresponding role, and the utilization rate of the equipment is low.

[0042] To solve these problems, the embodiments of the present application respectively propose a temperature control method for a falling film crystallizer, a temperature control system for a cooling medium, an electronic device, a computer-readable storage medium, and a computer program product. These embodiments will be described in detail below.

[0043] See also Figure 4 , Figure 4 This is a flow chart of a temperature control method for a falling film crystallizer according to an exemplary embodiment of the present invention. The temperature control method for a falling film crystallizer is used to control Figure 1 The temperature of the cooling medium in the cooling medium pipeline connected to the upper and middle cooling medium inlets of the falling film crystallizer (i.e., the cooling medium inlet of the pre-crystallization section and the cooling medium inlet of the crystallization section).

[0044] like Figure 4 As shown, in an exemplary embodiment of the present application, the temperature control method of the falling film crystallizer includes at least steps S410 to S440, which are described in detail as follows:

[0045] Step S410. Obtaining the crystallization state of the material to be processed in the falling film crystallizer;

[0046] It should be noted that the crystalline state includes the state where crystal nuclei have been formed;

[0047] For example, the material to be treated may be fluoroethylene carbonate solution, acrylic acid solution or 3,5-dimethylphenol;

[0048] Step S420: If the crystallization state indicates that crystal nuclei have been formed, the first cooling medium is controlled to increase in temperature at a first predetermined rate based on the first inlet temperature, and the second cooling medium is controlled to decrease in temperature at a second predetermined rate based on the second inlet temperature;

[0049] It should be noted that the first inlet temperature is lower than the second inlet temperature, the first cooling medium and the second cooling medium are cooling media in cooling medium pipes connected to the upper and middle cooling medium inlets of the falling film crystallizer, respectively, and the first inlet temperature and the second inlet temperature are temperatures of the cooling media when entering the upper and middle cooling medium inlets of the falling film crystallizer, respectively;

[0050] Exemplarily, the first inlet temperature is the same as the actual crystallization start temperature of the target product, and the second inlet temperature is the same as the theoretical crystallization start temperature of the target product;

[0051] Exemplarily, the first preset rate is 0.2-0.3°C / min, and the second preset rate is 0.1-0.18°C / min;

[0052] Step S430. Obtaining a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium;

[0053] Step S440: If the first real-time temperature is equal to the second real-time temperature, control the first cooling medium and the second cooling medium to cool down at a third preset rate until the temperature reaches a preset temperature threshold.

[0054] It should be noted that the third preset rate is greater than the first preset rate and the second preset rate, and the preset temperature threshold is less than the first inlet temperature.

[0055] Exemplarily, the third preset rate is 0.3-0.5°C / min,

[0056] The inventors considered that by obtaining the crystallization state of the material to be processed in the falling film crystallizer, the crystallization state includes the formation of crystal nuclei. If the crystallization state is the formation of crystal nuclei, the first cooling medium is controlled to increase the temperature at a first preset rate based on the first inlet temperature, and the second cooling medium is controlled to decrease the temperature at a second preset rate based on the second inlet temperature, to obtain the first real-time temperature of the first cooling medium and the second real-time temperature of the second cooling medium. If the first real-time temperature is equal to the second real-time temperature, the first cooling medium and the second cooling medium are controlled to decrease the temperature at a third preset rate until the preset temperature threshold is reached. That is, the pre-crystallization stage is first heated and then cooled. On the one hand, it can slightly dissolve large-volume crystal nuclei, which is the same as the sweating effect, equivalent to the first sweating of the crystal nuclei. This is beneficial for removing impurities in large-volume crystal nuclei, thereby improving the purity of the crystal nuclei. Since the pre-crystallization stage has initially formed crystal nuclei rapidly, a small amount of impurities are inevitably contained in the crystal nuclei. The slight temperature increase can sweat out some of these impurities in the crystal nuclei, preventing impurities contained in the nucleus from being too deeply wrapped in the later crystal growth stage and difficult to be discharged in the subsequent sweating process. On the other hand, under the same slightly elevated temperature conditions, large nuclei partially melt, with their volume remaining virtually unchanged. Only the edge spikes melt, achieving consistent morphology across different nuclei. Under the same slightly elevated temperature conditions, small nuclei completely melt, preventing the precipitation of new nuclei. At this point, the material consists almost exclusively of nuclei of uniform size. Consequently, crystals subsequently grown from these nuclei are uniform in size, improving product quality and purity. Furthermore, by fully utilizing the pre-crystallization stage, the surface area of ​​the crystallization stage is increased, further improving utilization.

[0057] In a specific embodiment, the temperature control steps of the falling film crystallizer are as follows:

[0058] Obtaining a crystallization state of a material to be processed in a falling film crystallizer, wherein the material to be processed is a fluoroethylene carbonate liquid having a purity of 99 wt %, and the crystallization state includes the formation of crystal nuclei;

[0059] If the crystallization state is that crystal nuclei have been formed, the first cooling medium, which is a 30% by volume ethylene glycol aqueous solution, is controlled to be heated at a first preset rate of 0.25° C. / min based on a first inlet temperature (the same as the actual crystallization start temperature of fluoroethylene carbonate), and the second cooling medium, which is a 30% by volume ethylene glycol aqueous solution, is controlled to be cooled at a second preset rate of 0.15° C. / min based on a second inlet temperature of 16° C. (the same as the theoretical crystallization start temperature of fluoroethylene carbonate);

[0060] Acquire a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium;

[0061] If the first real-time temperature is equal to the second real-time temperature, the first cooling medium and the second cooling medium are controlled to cool down at a third preset rate of 0.3° C. / min until the preset temperature threshold is -1° C.

[0062] See also Figure 5 This embodiment also provides a cooling medium temperature control system M500, which is used to control the temperature of the cooling medium in the cooling medium pipeline connected to the cooling medium inlet at the upper and middle parts of the falling film crystallizer.

[0063] like Figure 5 As shown, in an exemplary embodiment of the present application, the temperature control system M500 of the cooling medium includes:

[0064] The crystallization state acquisition module M510 is configured to obtain the crystallization state of the material to be processed in the falling film crystallizer, wherein the crystallization state includes the formation of crystal nuclei;

[0065] The first control module M520 is configured to control the first cooling medium to increase its temperature at a first preset rate based on a first inlet temperature, and to control the second cooling medium to decrease its temperature at a second preset rate based on a second inlet temperature, if the crystallization state is that crystal nuclei have been formed;

[0066] It should be noted that the first inlet temperature is lower than the second inlet temperature, the first cooling medium and the second cooling medium are cooling media in cooling medium pipes connected to the upper and middle cooling medium inlets of the falling film crystallizer, respectively, and the first inlet temperature and the second inlet temperature are the temperatures of the first cooling medium and the second cooling medium when they enter the upper and middle cooling medium inlets of the falling film crystallizer, respectively;

[0067] The real-time temperature acquisition module M530 is configured to obtain a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium;

[0068] The second control module M540, if the first real-time temperature is equal to the second cooling medium, cools down according to a third preset rate until it reaches a preset temperature threshold.

[0069] The third preset rate is greater than the first preset rate and the second preset rate, and the preset temperature threshold is less than the first inlet temperature.

[0070] It should be noted that the temperature control system for the cooling medium provided in the above embodiment and the temperature control method for the falling film crystallizer provided in the above embodiment are based on the same concept. The specific manner in which each module and unit performs operations has been described in detail in the method embodiment and will not be repeated here. In actual applications, the temperature control system for the cooling medium provided in the above embodiment can, as needed, allocate the above functions to different functional modules, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above, and this is not limited here.

[0071] An embodiment of the present application also provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the electronic device implements the temperature control method of the falling film crystallizer provided in the above-mentioned embodiments.

[0072] Figure 6 The following is a schematic diagram showing the structure of a computer system suitable for implementing an electronic device according to an embodiment of the present application. Figure 6 The computer system 600 of the electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0073] like Figure 6 As shown, the computer system 600 includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 602 or the program loaded from the storage part 608 into the random access memory (RAM) 603, such as executing the method described in the above embodiment. Various programs and data required for system operation are also stored in the RAM 603. The CPU 601, ROM 602 and RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0074] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, a mouse, and the like; an output section 607 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 608 including a hard disk; and a communication section 609 including a network interface card such as a LAN (Local Area Network) card or a modem. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. Removable media 611, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 610 as needed, so that computer programs read therefrom can be installed into the storage section 608 as needed.

[0075] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 609, and / or installed from a removable medium 611. When the computer program is executed by the central processing unit (CPU) 601, the various functions defined in the system of the present application are executed.

[0076] It should be noted that the computer-readable medium shown in the embodiments of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable computer program. This propagated data signal can take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. A computer program embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0077] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. Among them, each box in the flowchart or block diagram can represent a module, program segment, or part of the code, and the above-mentioned module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0078] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. In some cases, the names of these units do not constitute limitations on the units themselves.

[0079] Another aspect of the present application provides a computer-readable storage medium having a computer program stored thereon. When executed by a computer processor, the computer program causes the computer to execute the aforementioned method for controlling the temperature of a falling film crystallizer. The computer-readable storage medium may be included in the electronic device described in the above embodiments, or may exist independently and not be incorporated into the electronic device.

[0080] Another aspect of the present application provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the temperature control method for a falling film crystallizer provided in each of the above embodiments.

[0081] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A temperature control method for a falling film crystallizer, the temperature control method is used to control the temperature of the cooling medium in the cooling medium pipeline connected to the cooling medium inlet at the upper part and the middle part of the falling film crystallizer, the falling film crystallizer includes a cylinder, the top of the cylinder is provided with a feed port, the bottom of the cylinder is provided with a discharge port, a pre-crystallization section and a crystallization section are sequentially provided between the feed port and the discharge port, a plurality of crystallization tubes are provided inside the cylinder, all of the crystallization tubes are arranged vertically, the pre-crystallization section and the crystallization section are sequentially provided with a cooling medium inlet, a distribution plate, a cooling medium outlet and a crystallization tube clamp from top to bottom, characterized in that The temperature control method comprises: Obtaining a crystallization state of the material to be processed in the falling film crystallizer, wherein the crystallization state includes the formation of crystal nuclei; If the crystallization state is that crystal nuclei have been formed, controlling the first cooling medium to increase in temperature at a first preset rate based on a first inlet temperature, and controlling the second cooling medium to decrease in temperature at a second preset rate based on a second inlet temperature, wherein the first inlet temperature is lower than the second inlet temperature, the first cooling medium and the second cooling medium are cooling media in cooling medium pipes connected to the upper and middle cooling medium inlets of the falling film crystallizer, respectively, and the first inlet temperature and the second inlet temperature are temperatures of the first cooling medium and the second cooling medium when they enter the upper and middle cooling medium inlets of the falling film crystallizer, respectively; Acquire a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium; If the first real-time temperature is equal to the second real-time temperature, the first cooling medium and the second cooling medium are controlled to cool down at a third preset rate until a preset temperature threshold is reached, the third preset rate is greater than the first preset rate and the second preset rate, and the preset temperature threshold is less than the first inlet temperature.

2. The temperature control method according to claim 1, wherein: The first inlet temperature is the same as the actual crystallization start temperature of the target product.

3. The temperature control method according to claim 2, wherein: The second inlet temperature is the same as the theoretical crystallization start temperature of the target product.

4. The temperature control method according to claim 1, wherein: The first preset rate is 0.2-0.3°C / min.

5. The temperature control method according to claim 1, wherein: The second preset rate is 0.1-0.18°C / min.

6. The temperature control method according to claim 1, wherein: The third preset rate is 0.3-0.5°C / min.

7. A temperature control system for a cooling medium, the temperature control system being used to control the temperature of the cooling medium in a cooling medium pipeline connected to the cooling medium inlet at the upper and middle parts of a falling film crystallizer, the falling film crystallizer comprising a cylinder, a feed port being provided at the top of the cylinder, a discharge port being provided at the bottom of the cylinder, a pre-crystallization section and a crystallization section being sequentially provided between the feed port and the discharge port, a plurality of crystallization tubes being provided inside the cylinder, all of the crystallization tubes being arranged vertically, the pre-crystallization section and the crystallization section being sequentially provided with a cooling medium inlet, a distribution plate, a cooling medium outlet and a crystallization tube clamping plate from top to bottom, characterized in that: The temperature control system comprises: a crystallization state acquisition module configured to obtain the crystallization state of the material to be processed in the falling film crystallizer, wherein the crystallization state includes the formation of crystal nuclei; a first control module, if the crystallization state is that crystal nuclei have been formed, being configured to control the first cooling medium to increase in temperature at a first preset rate based on a first inlet temperature, and to control the second cooling medium to decrease in temperature at a second preset rate based on a second inlet temperature, wherein the first inlet temperature is lower than the second inlet temperature, the first cooling medium and the second cooling medium are cooling media in cooling medium pipes connected to the upper and middle cooling medium inlets of the falling film crystallizer, respectively, and the first inlet temperature and the second inlet temperature are temperatures of the first cooling medium and the second cooling medium when they enter the upper and middle cooling medium inlets of the falling film crystallizer, respectively; A real-time temperature acquisition module is configured to acquire a first real-time temperature of the first cooling medium and a second real-time temperature of the second cooling medium; The second control module is configured to control the first cooling medium and the second cooling medium to cool down at a third preset rate until a preset temperature threshold if the first real-time temperature is equal to the second real-time temperature, the third preset rate being greater than the first preset rate and the second preset rate, and the preset temperature threshold being less than the first inlet temperature.

8. An electronic device, characterized in that: The electronic device comprises: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the electronic device to implement the temperature control method for the falling film crystallizer according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor of a computer, the computer is caused to execute the temperature control method for a falling film crystallizer according to any one of claims 1 to 6.

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