A wet material screening device and a screening control method

Abstract

The present application relates to the field of material processing in biomass energy conversion process, and particularly relates to a continuous biomass hydrothermal liquefaction reaction wet material screening device and a screening control method. The device comprises a crushing mechanism, a multi-stage filtering mechanism, a positive displacement pump and a controller. The controller is connected with the positive displacement pump to control the operation condition of the positive displacement pump. The operation condition includes a forward rotation condition and a reverse rotation condition. When the device is in the forward rotation condition, the crushed biomass wet material is sucked into the multi-stage filtering mechanism for screening to obtain solid particles meeting the particle size requirement. When the device is in the reverse rotation condition, the residual solid particles in the multi-stage filtering mechanism are sucked into the crushing mechanism for secondary crushing to reduce the particle size of the solid particles. The present application can make the material flow from bottom to top to realize gravity deposition and recovery of large particles for re-crushing, effectively reduce the risk of blockage in the subsequent multi-layer filtering screen separation process, and fully utilize the material. The solid content of the wet material after screening can be increased to more than 10%.

Description

Technical Field

[0001] This invention relates to the field of material handling in biomass energy conversion processes, and in particular to a continuous biomass hydrothermal liquefaction reaction wet material screening device and screening control method. Background Technology

[0002] During the hydrothermal liquefaction reaction of biomass, the resulting wet material has a complex composition, containing solid particles of different sizes, liquids, and some colloidal substances. For subsequent separation, purification, and resource utilization, the wet material needs to be screened to obtain the material containing solid particles.

[0003] Currently, the commonly used screening methods mainly employ membrane separation technology, but this method has many problems in practical applications: On the one hand, large particles in wet material are prone to deposit on the membrane surface, causing membrane blockage, reducing screening efficiency, increasing the frequency of membrane cleaning and replacement, and increasing production costs. On the other hand, the pore size of the membrane determines the solid content of the material after sieving. The better the separation effect of the membrane, the lower the solid content after sieving, which also cannot meet the requirements of subsequent processes. Summary of the Invention

[0004] The present invention aims to at least improve one of the technical problems existing in the prior art. To this end, the present invention proposes a continuous biomass hydrothermal liquefaction reaction wet material screening device and screening control method.

[0005] The technical solution of the present invention is as follows: A wet material screening device, mounted on a support platform, is used in a continuous biomass hydrothermal liquefaction reaction. The device includes: The crushing mechanism has a feed inlet and a circulation interface. The feed inlet is connected to an external biomass wet material feed inlet and is used to receive biomass wet material for crushing. A multi-stage filtration system for filtering wet biomass feed flowing from bottom to top, including: The cylinder has a cavity with a feed inlet at the bottom; A discharge check valve is installed on the cylinder away from the inlet to discharge wet material after multi-layer filtration and screening, and to prevent backflow of wet material. Multi-layer filter screens are installed at intervals on the inner wall of the cylinder to divide the cavity into multiple filter chambers. The aperture of the multi-layer filter screens arranged along the filtration path gradually decreases to achieve step-by-step filtration. The positive displacement pump has two symmetrical inlet and outlet pipes, which are respectively connected to the circulation port and the feed port; The control panel integrates a controller, which is connected to the positive displacement pump to control the operating conditions of the positive displacement pump. The operating conditions include forward rotation and reverse rotation. When in forward rotation, the crushed wet biomass is drawn into a multi-stage filtration mechanism for screening to obtain solid particles that meet the particle size requirements. When in reverse rotation, the solid particles remaining in the multi-stage filtration mechanism are drawn into a crushing mechanism for secondary crushing to reduce the particle size of the solid particles.

[0006] In one possible technical solution, a one-way valve is further provided in the cavity located below the multi-layer filter screen.

[0007] In one possible technical solution, each filter screen is rotatably mounted on the inner wall of the cylinder to adjust the angle between the filter screen and the horizontal plane, until the angle reaches a maximum of 90° when perpendicular to the horizontal plane. The wet material accumulated on the surface of the filter screen falls off under its own gravity, which is beneficial for subsequent cleaning or secondary crushing, improving material utilization. The device also includes a self-cleaning mechanism for cleaning the filter screen, wherein the self-cleaning mechanism includes: Multiple spray heads are installed on the inner wall of the cylinder and connected to an external water pump. At least two spray heads are installed in each filter chamber. The spray heads spray water to clean the filter screen. The water flow carries the wet material remaining on the screen or membrane surface and falls into the bottom of the filter barrel. Under the action of the reciprocating circulation pump, it flows into the crushing barrel and is discharged.

[0008] In one possible technical solution, an ultrasonic vibrator is further included, installed on the outer wall of the cylinder and connected to the controller, to assist the wet material adhering to the surface of the filter screen to fall off, which is beneficial for subsequent cleaning or secondary crushing.

[0009] In one possible technical solution, the filter screen is further comprising three layers, with the pore sizes of each layer from bottom to top being 150μm, 106μm, and 75μm, respectively corresponding to 100 mesh, 150 mesh, and 200 mesh filter screens, so as to perform orderly stepwise filtration of wet material, reduce the solid content of wet material on the surface of each layer of filter screen, avoid clogging, and improve the solid content of wet material after screening.

[0010] In one possible technical solution, the filter screen is further described as a filter membrane, specifically a high-strength fiber filter membrane with separation and filtration function. It employs multi-stage membrane series separation, which can progressively increase the solid content in the wet material and achieve good separation effect.

[0011] In one possible technical solution, the control panel further includes: A switch, connected to an external power source and the controller; Multiple adjustment knobs, connected to the controller, are used to adjust the operating environment of the wet material in the positive displacement pump.

[0012] A method for controlling wet material screening, comprising: Set up the aforementioned wet material screening device and pre-input the first target time value and the second target time value; The biomass material is received into the crushing mechanism, and the biomass material is crushed by the crushing mechanism to obtain crushed wet material; The controller adjusts the positive displacement pump to the forward rotation mode and starts to accumulate the first working time, sucking in the crushed wet material to the multi-stage filtration mechanism for screening to obtain solid particles that meet the particle size requirements; Determine whether the first working time has reached the first target time value. If so, the controller adjusts the positive displacement pump to reverse operation and starts to accumulate and calculate the second working time. The solid particles remaining in the multi-stage filtration mechanism are sucked into the crushing mechanism for secondary crushing to reduce the particle size of the solid particles. Determine whether the second working time has reached the second target time value. If so, the controller adjusts the positive displacement pump to the forward rotation mode and re-receives the crushed wet material for screening, completing one wet material screening cycle. Repeat the wet material screening cycle multiple times until the wet material is completely screened.

[0013] The wet material screening device and screening control method according to the present invention, when applied to a continuous biomass hydrothermal liquefaction reaction process, have the following beneficial effects: 1. This invention controls the positive displacement pump to operate in both forward and reverse states via a controller, which allows the material to flow from bottom to top, achieving gravity sedimentation and recycling of large particles for re-crushing. This effectively reduces the risk of clogging during the subsequent multi-layer filter screen separation process and makes full use of the material.

[0014] 2. The multi-stage filter screen is connected in series for separation, which can gradually increase the solid content in the wet material. The separation effect is good. Compared with the existing technology of ordinary membrane screening with a solid content of 3%, the solid content of the wet material can be increased to more than 10% after multiple screening cycles without significant clogging.

[0015] 3. The self-cleaning device can remove impurities from the membrane surface in a timely manner, prevent the filter screen or membrane from clogging, extend the service life of the membrane, and reduce production costs.

[0016] 4. The screening control method of the present invention can optimize the separation effect according to actual needs, further improve the content of solids after screening, and meet the requirements of subsequent processes.

[0017] A computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the above-described wet material screening control method.

[0018] A computer storage medium, wherein the computer storage medium stores instructions that, when executed on a computer, cause the computer to perform the aforementioned wet material screening control method.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall schematic diagram of a wet material screening device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a wet material screening device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the multi-stage filtration state of biomass wet material when the wet material screening device according to an embodiment of the present invention is in forward operation; Figure 4 This is a schematic diagram of the wet material recycling and re-crushing of biomass wet material under the reverse operation condition of the wet material screening device according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the self-cleaning and emptying state of the wet material screening device according to an embodiment of the present invention; Figure 6 This is a flowchart of a wet material screening control method according to an embodiment of the present invention.

[0022] Figure label: Crushing mechanism 1, feed inlet 101, circulation interface 102, crushing shell 103, motor 104, crushing blades 105; Multi-stage filtration mechanism 2, cylinder 200, inlet 201, outlet check valve 202, inlet check valve 203, filter screen 204; Positive displacement pump 3; Control panel 4, switch 41, adjustment knob 42; 5 spray heads; Support platform 10. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, it may include a series of steps or units, or optionally, steps or units not listed, or other steps or units inherent to these processes, methods, products, or devices.

[0027] The accompanying drawings show only the portions relevant to this application, not all of them. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations may be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process may correspond to a method, function, procedure, subroutine, subprogram, etc.

[0028] The terms “component,” “module,” “system,” “unit,” etc., used in this specification are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a unit can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, a thread of execution, a program, and / or distributed between two or more computers. Furthermore, these units can be executed from various computer-readable media on which various data structures are stored. Units can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from a second unit interacting with another unit between a local system, a distributed system, and / or a network; for example, the Internet interacting with other systems via signals).

[0029] Example 1 like Figures 1 to 5 As shown, this embodiment provides a wet material screening device, which is installed on a support platform 10 and applied to continuous biomass hydrothermal liquefaction reaction. The device includes: The crushing mechanism 1 has a feed inlet 101 and a circulation interface 102. The feed inlet 101 is connected to an external biomass wet material feed inlet for receiving biomass wet material and crushing it. In this embodiment, the crushing mechanism 1 includes: The crushing shell 103 has a feed inlet 101 and a circulation interface 102 on both sides of the bottom. An electric motor 104 is installed in the crushing housing 103 and connected to the controller. The output shaft of the electric motor 104 is connected to a rotating shaft, which extends through the crushing housing 103 to the bottom of the crushing housing 103. Multiple crushing blades 105 are distributed on the rotating shaft, and the rotating shaft is driven to rotate by the motor 104 to crush the wet biomass.

[0030] Multi-stage filtration unit 2, used for filtering wet biomass material flowing from bottom to top, includes: The cylinder 200 has a cavity with a feed inlet 201 at the bottom and an air inlet check valve 203 at the top. The discharge check valve 202 is installed on the cylinder 200 away from the inlet 201, and is used to discharge the wet material after multi-layer filtration and screening, and to prevent the wet material from flowing back. Multi-layer filter screens 204 are installed at intervals on the inner wall of the cylinder 200 to divide the cavity into multiple filter chambers. The aperture of the multi-layer filter screens 204 arranged along the filtration path gradually decreases to achieve step-by-step filtration. The positive displacement pump 3 has two symmetrical inlet and outlet pipes, which are respectively connected to the circulation port 102 and the feed port 201; The control panel 4 integrates a controller, which is connected to the positive displacement pump 3 to control the operating conditions of the positive displacement pump 3. The operating conditions include forward rotation and reverse rotation. When in forward rotation, the crushed biomass wet material is sucked into the multi-stage filtration mechanism 2 for screening to obtain solid particles that meet the particle size requirements. When in reverse rotation, the solid particles remaining in the multi-stage filtration mechanism 2 are sucked into the crushing mechanism 1 for secondary crushing to reduce the particle size of the solid particles.

[0031] It should be noted that, in this embodiment, the one-way valve 202 located in the cavity below the multi-layer filter screen 204 is used to prevent wet material from flowing back into the cylinder, and the one-way valve 203 is used to connect with the outside, maintain air pressure balance, and facilitate the return of residual solid particles to the crushing mechanism.

[0032] It should be noted that in this embodiment, each filter screen is rotatably mounted on the inner wall of the cylinder 200 to adjust the angle between the filter screen and the horizontal plane until the angle reaches a maximum of 90° when perpendicular to the horizontal plane. The wet material accumulated on the surface of the filter screen falls off under its own weight, which is beneficial for subsequent cleaning or secondary crushing, improving material utilization. The device also includes a self-cleaning mechanism for cleaning the filter screen, wherein the self-cleaning mechanism includes: Multiple spray heads 5 are installed on the inner wall of the cylinder 200 and connected to an external water pump. At least two spray heads 5 are installed in each filter chamber. The spray heads 5 spray water to clean the filter screen. The water flow carries the wet material remaining on the screen or membrane surface and falls into the bottom of the filter bucket. Under the action of the reciprocating circulation pump, it flows into the crushing bucket and is discharged.

[0033] It should be noted that in this embodiment, the multiple spray heads 5 located in each filter chamber are evenly distributed circumferentially on the inner wall of the cylinder 200 to ensure uniform and thorough cleaning and avoid the occurrence of dead corners that are difficult to clean.

[0034] It should be noted that, in this embodiment, a rotating shaft is installed at the diameter of each filter screen. The rotating shaft passes through the cylinder 200 and is rotatably connected to the side wall of the cylinder 200. The connection between the rotating shaft and the cylinder 200 is sealed. The rotating shaft extending to the side wall of the cylinder 200 can be fixed by a limiting member to prevent re-rotation after the rotating shaft has been rotated and positioned. The limiting member includes, but is not limited to, a wedge embedded in the outer wall of the cylinder 200. The wedge has a multi-angle square hole that matches the rectangular pins at both ends of the rotating shaft. The rotation of the rotating shaft is restricted by the rectangular pins passing through the square holes of the wedge.

[0035] It should be noted that, in this embodiment, an ultrasonic vibrator is also included, which is installed on the outer wall of the cylinder 200 and connected to the controller. It is used to assist the wet material adhering to the surface of the filter screen to fall off, which is beneficial for subsequent cleaning or secondary crushing.

[0036] It should be noted that in this embodiment, the ultrasonic cleaning frequency is 20000Hz~40000Hz and the stirring rate is 10r / min~1000r / min, which facilitates efficient cleaning of the attached wet material.

[0037] It should be noted that in this embodiment, the filter screen 204 has three layers. The pore sizes of each layer of filter screen 204 from bottom to top are 150μm, 106μm, and 75μm, respectively, corresponding to 100 mesh, 150 mesh, and 200 mesh filter screens, so as to perform orderly step-by-step filtration of wet material, reduce the solid content of wet material on the surface of each layer of filter screen 204, avoid clogging, and improve the solid content of wet material after screening.

[0038] It should be noted that in this embodiment, the filter screen 204 is a filter membrane, specifically a high-strength fiber filter membrane with separation and filtration function. It adopts multi-stage membrane series separation, which can gradually increase the solid content in the wet material and achieve good separation effect.

[0039] It should be noted that, in this embodiment, the control panel 4 further includes: Switch 41 is connected to an external power source and the controller; Multiple adjustment knobs 42 are connected to the controller to adjust the working environment of the wet material in the positive displacement pump 3. Specifically, the adjustment knobs include a pump pressure knob, a speed knob, and a flow rate knob, which are respectively connected to the controller to adjust the pump pressure of the positive displacement pump 3, the speed of the drive motor of the positive displacement pump 3, and the flow rate of the wet material. This part is the basic knowledge of pump pressure control of the positive displacement pump 3 and belongs to the prior art, so it is not elaborated in this application.

[0040] It should be noted that, in this embodiment, the support platform 10 is equipped with four casters at the bottom for easy movement.

[0041] This embodiment provides the following specific implementation examples: The wet material from the hydrothermal liquefaction reaction of biomass is introduced into the screening device mentioned above, wherein the solid particle content (solid content) of the wet material is 15%. The controller switches to forward rotation mode, and the forward rotation mode is as follows: Figure 1 As shown, the material after being crushed by the crushing mechanism flows from bottom to top under the action of the positive displacement pump, and after being filtered by a screen or membrane with a diameter of large to small, it flows into the wet material collection bucket through the discharge check valve. After the screening device runs for 30 minutes in forward rotation, the controller switches the positive displacement pump to reverse rotation. The wet material flows from top to bottom through the multi-layer filter screen. During this time, the flow rate of the wet material is controlled to be 30 kg / h. Large particles that are not collected are returned to the crushing mechanism for secondary crushing. Simultaneously, ultrasonic cleaning and spray head self-cleaning were performed for 30 minutes. The solid content of the wet material after sieving increased to over 10%, with no significant clogging. Compared to the 3% solid content of wet material after sieving with a conventional membrane, which requires repeated cleaning to prevent clogging, this method achieved a significantly better result.

[0042] Example 2 like Figure 6 As shown, this embodiment provides a method for controlling wet material screening, which includes: S1: Set up the above-mentioned wet material screening device, and pre-input the first target time value and the second target time value; S2: Receive biomass material into the crushing mechanism, and crush the biomass material based on the crushing mechanism to obtain crushed wet material; S3: The controller adjusts the positive displacement pump to the forward rotation condition and starts to accumulate the first working time of the forward rotation condition. The pump sucks in the crushed wet material to the multi-stage filtration mechanism for screening to obtain solid particles that meet the particle size requirements. S4: Determine whether the first working time has reached the first target time value. If so, the controller adjusts the positive displacement pump to reverse operation and starts to accumulate and calculate the second working time of the reverse operation. The solid particles remaining in the multi-stage filtration mechanism are sucked into the crushing mechanism for secondary crushing to reduce the particle size of the solid particles. S5: Determine whether the second working time has reached the second target time value. If so, the controller adjusts the positive displacement pump to the forward rotation mode and re-receives the crushed wet material for screening, completing one wet material screening cycle. S6: Repeat the wet material screening cycle multiple times until the wet material is completely screened.

[0043] It should be noted that in this embodiment, both the first working time and the second working time are 1 min to 100 min, and the two working times are the same or similar. The flow rate of the wet material from top to bottom is 1 kg / h to 100 kg / h, and the flow rate of the wet material from bottom to top is 1 kg / h to 100 kg / h.

[0044] The wet material screening device and screening control method according to the present invention, when applied to a continuous biomass hydrothermal liquefaction reaction process, have the following beneficial effects: 1. This invention controls the positive displacement pump to operate in both forward and reverse states via a controller, which allows the material to flow from bottom to top, achieving gravity sedimentation and recycling of large particles for re-crushing. This effectively reduces the risk of clogging during the subsequent multi-layer filter screen separation process and makes full use of the material.

[0045] 2. The multi-stage filter screen is connected in series for separation, which can gradually increase the solid content in the wet material. The separation effect is good. Compared with the existing technology of ordinary membrane screening with a solid content of 3%, the solid content of the wet material can be increased to more than 10% after multiple screening cycles without significant clogging.

[0046] 3. The self-cleaning device can remove impurities from the membrane surface in a timely manner, prevent the filter screen or membrane from clogging, extend the service life of the membrane, and reduce production costs.

[0047] 4. The screening control method of the present invention can optimize the separation effect according to actual needs, further improve the content of solids after screening, and meet the requirements of subsequent processes.

[0048] Example 3 This embodiment provides a wet material screening control system for implementing the material screening control method described in the above embodiments. The wet material screening control system in this embodiment can be a device, a component in a terminal, an integrated circuit, or a chip. The device can be a mobile electronic device or a non-mobile electronic device. For example, mobile electronic devices can be mobile phones, tablets, laptops, handheld computers, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc., while non-mobile electronic devices can be servers, network attached storage (NAS), personal computers (PCs), etc. This embodiment does not impose specific limitations.

[0049] The wet material screening control system in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit it.

[0050] The wet material screening control system provided in this application embodiment can achieve... Figure 1 The various processes implemented in the wet material screening control method described in the embodiment of the method are not repeated here to avoid repetition.

[0051] The wet material screening control system according to embodiments of the present invention can control the positive displacement pump to operate in both forward and reverse states via a controller. This allows the material to flow from bottom to top, achieving gravity sedimentation and recovery of large particles for re-crushing. This effectively reduces the risk of clogging during subsequent multi-layer filter screen separation and fully utilizes the material. Using multi-stage filter screens in series for separation can progressively increase the solid content in the wet material, resulting in excellent separation performance. Compared to the 3% solids content after ordinary membrane screening in existing technologies, the solids content of the wet material after screening can be increased to over 10%, without significant clogging.

[0052] Optionally, embodiments of this application also provide an electronic device, including a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the various processes of the above-described wet material screening control method embodiment and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0053] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described wet material screening control method embodiment and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0054] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0056] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0057] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0058] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wet material screening device, characterized in that, Installed on a support platform (10), and used for continuous biomass hydrothermal liquefaction reaction, the device includes: The crushing mechanism (1) has a feed inlet (101) and a circulation interface (102). A multi-stage filtration mechanism (2) is used to filter wet biomass material flowing from bottom to top, including: The cylinder (200) has a cavity with a feed inlet (201) at the bottom. A discharge check valve (202) is installed on the cylinder (200) away from the feed inlet (201) for discharging the wet material after screening; Multi-layer filter screens (204) are installed at intervals from top to bottom on the inner wall of the cylinder (200) to divide the cavity into multiple filter chambers. The aperture of the multi-layer filter screens (204) arranged along the filter path gradually decreases. Each filter screen (204) can be rotatably installed on the inner wall of the cylinder (200). The positive displacement pump (3) has two symmetrical inlet and outlet pipes, which are respectively connected to the circulation port (102) and the feed port (201). The control panel (4) integrates a controller and is connected to the positive displacement pump (3) to control the operating conditions of the positive displacement pump (3). The operating conditions include forward rotation and reverse rotation. When in forward rotation, the crushed biomass wet material is sucked into the multi-stage filtration mechanism (2) for screening to obtain solid particles that meet the particle size requirements. When in reverse rotation, the solid particles remaining in the multi-stage filtration mechanism (2) are sucked into the crushing mechanism (1) for secondary crushing to reduce the particle size of the solid particles.

2. The wet material screening device according to claim 1, characterized in that, A one-way valve is provided in the cavity located below the multi-layer filter screen (204).

3. The wet material screening device according to claim 2, characterized in that, The device further includes a self-cleaning mechanism for cleaning the filter screen, wherein the self-cleaning mechanism includes: Multiple spray heads (5) are installed on the inner wall of the cylinder (200), wherein at least two spray heads (5) are installed in each filter chamber.

4. The wet material screening device according to claim 1, characterized in that, It also includes an ultrasonic vibrator, which is installed on the outer wall of the cylinder (200) and connected to the controller.

5. The wet material screening device according to claim 3, characterized in that, The filter screen (204) has three layers, and the pore sizes of each layer of filter screen (204) from bottom to top are 150μm, 106μm and 75μm respectively.

6. The wet material screening device according to claim 5, characterized in that, The filter screen (204) is a filter membrane, specifically a high-strength fiber filter membrane.

7. The wet material screening device according to claim 1, characterized in that, The control panel (4) also includes: Switch (41) is connected to an external power source and the controller; Multiple adjustment knobs (42) are connected to the controller.

8. A method for controlling wet material screening, characterized in that, include: Construct a wet material screening device as described in any one of claims 1 to 7, and pre-input a first target time value and a second target time value; The biomass material is received into the crushing mechanism, and the biomass material is crushed by the crushing mechanism to obtain crushed wet material; The controller adjusts the positive displacement pump to the forward rotation mode and starts to accumulate the first working time, sucking in the crushed wet material to the multi-stage filtration mechanism for screening to obtain solid particles that meet the particle size requirements; Determine whether the first working time has reached the first target time value. If so, the controller adjusts the positive displacement pump to reverse operation and starts to accumulate and calculate the second working time. The solid particles remaining in the multi-stage filtration mechanism are sucked into the crushing mechanism for secondary crushing to reduce the particle size of the solid particles. Determine whether the second working time has reached the second target time value. If so, the controller adjusts the positive displacement pump to the forward rotation mode and re-receives the crushed wet material for screening, completing one wet material screening cycle. Repeat the wet material screening cycle multiple times until the wet material is completely screened.

9. A computer device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the wet material screening control method as described in claim 8.

10. A computer storage medium, characterized in that, The computer storage medium stores instructions that, when executed on the computer, cause the computer to perform the wet material screening control method as described in claim 8.

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