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CN-122006868-A - Low-carbon superfine grinding system for plant fibers and particle size self-adaptive control method

CN122006868ACN 122006868 ACN122006868 ACN 122006868ACN-122006868-A

Abstract

The invention relates to the technical field of plant fiber crushing and processing, and discloses a low-carbon superfine crushing system and a particle size self-adaptive control method for plant fibers, wherein the low-carbon superfine crushing system comprises a pretreatment device, a two-stage crushing device, an integrated grinding classification device and a collection device which are connected in an airtight manner in sequence; the integrated grinding and grading device adopts a vertical integrated structure, the lower part is subjected to turbine grinding, the upper part is subjected to turbine grading, coarse powder falls back by gravity to realize internal circulation, the system is provided with an intelligent control system, the intelligent control system comprises an online particle size monitoring unit, a control unit and an execution unit, the monitoring unit collects particle size data of powder in air flow in real time, the control unit calculates deviation based on a PID algorithm, the control unit increases the rotating speed of a grading wheel when the particle size is coarser, reduces the rotating speed or the induced air quantity when the particle size is finer, and the execution unit responds to instructions to dynamically adjust. According to the invention, the energy consumption is reduced through structural coupling, the fluctuation of the working condition is compensated in real time by utilizing closed loop feedback, the overgrinding is effectively avoided, and the stable and consistent particle size distribution of the finished product is ensured.

Inventors

  • ZHU FU
  • ZHANG CHANGPING

Assignees

  • 金纳多生物工程(山东)有限公司

Dates

Publication Date
20260512
Application Date
20260119

Claims (10)

  1. 1. The low-carbon superfine pulverizing system for the plant fibers is characterized by comprising a pretreatment device, a two-stage pulverizing device, an integrated grinding and classifying device and a collecting device which are sequentially connected in an airtight manner along the material flow direction; the plant fiber superfine grinding system also comprises an intelligent control system, wherein the intelligent control system comprises an online granularity monitoring unit, a control unit and an execution unit; the online particle size monitoring unit is arranged on a connecting pipeline between the integrated grinding classification device and the collecting device and is used for detecting the particle size distribution condition of powder in air flow in real time and outputting real-time particle size data to the control unit; The control unit is respectively connected with the online granularity monitoring unit and the execution unit in a signal way and is used for receiving the real-time granularity data and performing operation based on the real-time granularity data so as to output a control instruction to the execution unit; the execution unit comprises a first execution mechanism for adjusting the internal rotating speed of the integrated grinding classification device and a second execution mechanism for adjusting the air quantity of the system, and is used for receiving the control instruction and executing an adjusting action in response to the control instruction.
  2. 2. The plant fiber low-carbon superfine grinding system according to claim 1, wherein the integrated grinding and classifying device adopts an integrated vertical structural design, the lower part of the integrated grinding and classifying device is a vertical turbine grinder, and the upper part of the integrated grinding and classifying device is a high-efficiency turbine classifier; the multi-layer special-shaped turbine rotor arranged in the vertical turbine grinder grinds materials to generate gas-solid mixed flow; the gas-solid mixed flow directly rises into the high-efficiency turbine classifier under the action of negative pressure and is separated into qualified fine powder and unqualified coarse powder; And the unqualified coarse powder falls back to the vertical turbine grinder for regrinding under the gravity along a coarse powder falling path built in the integrated grinding and classifying device, and the qualified fine powder is discharged as a finished product.
  3. 3. The plant fiber low-carbon superfine grinding system according to claim 2, wherein the multi-layer special-shaped turbine rotor is provided with at least three layers of grinding discs along the axial direction, a plurality of grinding blades are distributed on the circumference of each layer of grinding disc, the grinding blades are designed into a curved arc surface or a twisting surface structure, and the edges of the grinding blades are provided with saw teeth or grooves; The outer wall of the grinding cavity of the vertical turbine grinding machine is provided with a cooling jacket, and circulating cooling water is introduced into the cooling jacket.
  4. 4. A plant fiber low-carbon ultra-fine pulverizing system according to claim 3, wherein said two-stage pulverizing apparatus comprises a primary pulverizing unit and a secondary pulverizing unit which are arranged in series; the first-stage crushing unit is a shearing crusher and is used for crushing raw materials and outputting coarse particles with 20 meshes; The secondary crushing unit is a hammer type micro-powder machine and is used for receiving the 20-mesh coarse particles, and further crushing the 20-mesh coarse particles by utilizing the high-frequency impact effect so as to output 80-mesh fine particles.
  5. 5. The plant fiber low-carbon superfine grinding system according to claim 1, wherein the online particle size monitoring unit is configured as an industrial online laser particle size analyzer, a protective sleeve with an annular airflow channel is arranged outside a probe of the online particle size monitoring unit, and the protective sleeve is connected with a compressed air source so as to form a flowing air curtain on the surface of a probe window; the on-line granularity monitoring unit acquires diffraction light signals passing through the probe window in real time; And analyzing and calculating the diffraction light signal by using a built-in Mie scattering theory algorithm model, so as to generate and output the real-time granularity data.
  6. 6. The low-carbon superfine pulverizing system of plant fiber according to claim 2, wherein the control unit calculates a difference between the real-time particle size data and a target particle size value based on a PID control algorithm, thereby generating a particle size deviation value; Judging the grinding state of the current system based on the granularity deviation value, thereby generating the control instruction, wherein: When the granularity deviation value indicates that the granularity is coarse, generating the control instruction for improving the rotating speed of the classifying wheel of the efficient turbine classifier; and when the particle size deviation value indicates that the particle size is finer, generating the control instruction for reducing at least one of the rotating speed of the classifying wheel of the efficient turbine classifier and the air quantity of the system.
  7. 7. A low-carbon superfine grinding system for plant fibers according to claim 2, characterized in that, the first executing mechanism and the second executing mechanism are variable frequency drivers; the high-efficiency turbine classifier comprises an inverted conical air guide sleeve and a cage-shaped classifying wheel positioned in the air guide sleeve, and the first actuating mechanism is used for adjusting the rotating speed of the cage-shaped classifying wheel.
  8. 8. A plant fiber low-carbon superfine pulverizing system according to claim 1, wherein the collecting device comprises a cyclone separator and a pulse bag type dust collector which are connected in series; the cyclone separator receives the air flow from the integrated grinding and classifying device and separates superfine powder products; The fine dust which is not separated enters the pulse bag type dust collector along with the air flow and is trapped by the filter bag, and the purified air is discharged by a system induced draft fan.
  9. 9. The low-carbon superfine pulverizing system of plant fiber according to claim 1, wherein the pretreatment device is a dryer equipped with a hot air circulation system for reducing the water content of the raw material to 8% or less.
  10. 10. A particle size self-adaptive control method of a low-carbon superfine grinding system of plant fibers, which is characterized by being applied to the low-carbon superfine grinding system of plant fibers according to any one of claims 1-9, and comprising the following steps: S1, setting a target particle size value in a control unit, wherein the target particle size value is specifically a D50 median diameter value of a plant fiber superfine powder finished product; s2, continuously sampling the gas-solid two-phase flow output by the integrated grinding and classifying device by utilizing an online particle size monitoring unit so as to obtain a diffraction light signal; s3, the control unit receives the real-time granularity data, compares the real-time granularity data with the target granularity value set in the step S1, and generates a comparison result; And S4, the control unit outputs the control instruction to an execution unit based on the comparison result, and the execution unit receives and responds to the control instruction to dynamically adjust at least one of the rotating speed of the efficient turbine classifier and the air intake quantity of the system, so that the subsequently output real-time granularity data approaches and is stabilized at the target granularity value.

Description

Low-carbon superfine grinding system for plant fibers and particle size self-adaptive control method Technical Field The invention relates to the technical field of plant fiber crushing processing, in particular to a low-carbon superfine crushing system of plant fibers and a particle size self-adaptive control method. Background The plant fiber superfine powder is used as an important filler or reinforcement of a biological base material, and has wide application prospect in the field of composite materials. However, the existing superfine grinding technology still has some technical problems to be solved when processing materials with toughness and heat sensitivity such as plant fibers. The traditional jet milling technology mainly relies on high-speed jet-wrapped materials for collision milling, and has low energy utilization rate, so that the energy consumption of unit products is high. In the existing mechanical crushing systems, the grinding device and the classifying device are usually arranged separately as independent units, and the two devices need to be connected in a pneumatic conveying way through a long pipeline. The distributed layout mode not only increases the on-way resistance and energy loss of the materials in the circulation process and causes long process flow, but also increases the occupied area and maintenance difficulty of the system. In addition, conventional mechanical milling processes often lack precise control over material residence time. When the qualified fine powder is not separated and discharged in time, the mechanical action can be repeatedly born in the grinding cavity, so that the excessive grinding phenomenon is caused, the ineffective consumption of energy is caused, and a large amount of grinding heat is generated. Because plant fibers belong to heat-sensitive materials, the accumulation of heat easily causes thermal oxidation or denaturation of the fiber surface, and damages the natural length-diameter ratio and the surface chemical activity of the plant fibers, thereby affecting the interfacial compatibility and the mechanical property of the plant fibers in downstream composite materials. Moreover, the existing production line mostly adopts an open loop control mode, and an on-line monitoring means capable of reflecting the product quality in real time is lacking. The adjustment of production parameters often depends on manual experience or on delayed laboratory test results. However, the characteristics of the plant fiber raw material such as the water content and the fiber length often fluctuate, and the fixed operation parameters cannot adapt to the variation. The hysteresis of the control mode leads to wider particle size distribution of the product, poorer quality stability among batches and difficult meeting the application scene with higher requirement on the consistency of the product. Disclosure of Invention Aiming at the problems that the grinding and classifying equipment in the existing plant fiber grinding technology is independently arranged to cause high energy consumption and long process flow, and the control mode is dependent on manual experience or open loop control, so that the fluctuation of the characteristics of raw materials cannot be responded in real time to cause uneven particle size distribution and excessive grinding of finished products, the invention provides a low-carbon superfine grinding system for plant fibers and a particle size self-adaptive control method. The system realizes energy efficiency optimization and product granularity stabilization of the crushing process through an integrated structure and closed-loop intelligent control. In order to achieve the above purpose, the invention is realized by the following technical scheme: The invention provides a low-carbon superfine grinding system for plant fibers, which comprises a pretreatment device, a two-stage grinding device, an integrated grinding and classifying device and a collecting device which are sequentially connected in an airtight manner along the material flow direction. The system is configured with an intelligent control system, and the intelligent control system comprises an online granularity monitoring unit, a control unit and an execution unit. The online particle size monitoring unit is arranged on a connecting pipeline between the integrated grinding classification device and the collecting device and is used for detecting real-time particle size data of powder in air flow. The control unit is respectively connected with the online granularity monitoring unit and the execution unit in a signal way and is used for receiving the real-time granularity data and performing operation so as to output a control instruction to the execution unit. The execution unit comprises a first execution mechanism for adjusting the internal rotating speed of the integrated grinding classification device and a second execution mechanism for adjusting the air quantity of the s