Lignin crushing and drying device system

Abstract

The utility model provides a lignin crushing and drying device system. The lignin crushing and drying device system comprises a wet material crushing device, a two-way drum-type drying device, a mechanical superfine crushing device and a lignin separating and collecting device which are sequentially connected along the material flow direction. According to the lignin crushing and drying device system provided by the utility model, wet crushing and dry crushing are combined, the uniformity and the heat exchange efficiency of materials in the drying process are ensured by the wet crushing, the quality of lignin dried products is high, the dried materials are finely crushed on the basis of the wet crushing, lignin particles are more uniform, and the quality of the lignin particles is improved. And the granularity of the lignin finished product meets the application requirement.

Description

Technical Field

[0001] This utility model belongs to the field of lignin production technology, specifically relating to a lignin pulverizing and drying device system. Background Technology

[0002] Lignin is a natural high-molecular polymer widely found in plant cell walls and is the second largest renewable biomass resource after cellulose. In recent years, with the advancement of green chemistry and sustainable development concepts, lignin, with its renewable, biodegradable, and unique chemical structure, has shown broad application prospects in fields such as bio-based materials, polymer composites, slow-release fertilizers, and adsorbent materials.

[0003] However, lignin molecules contain numerous active groups such as phenolic hydroxyl and methoxy groups, making them highly susceptible to thermosensitive degradation during processing. Furthermore, during refining and drying, the product is easily affected by temperature, leading to color darkening or carbonization. Therefore, in the industrial application of lignin, drying and pulverizing are crucial processes that determine product quality, placing higher technical demands on the drying and pulverizing technology.

[0004] Current mainstream drying technologies mainly include three types of processes: spray drying, flash drying, and conventional drum drying. Spray drying uses atomized droplets to contact the heat medium, achieving rapid dehydration, but it is limited by low feed solid content, high evaporation load, high energy consumption, and restrictions on large-scale applications. Flash drying uses high-temperature airflow for instantaneous heat transfer; although the drying rate is fast, direct contact between the material and the high-temperature medium can easily cause localized overheating, leading to lignin molecule carbonization. Conventional drum drying equipment is simple, but it is limited by low heat transfer efficiency and uneven heating of the material.

[0005] For example, CN213811347U discloses an anti-caking lignin spray drying device, which includes a spray drying tower and a pulverizer installed on the air conveying pipeline. Larger lignin particles are then separated using a cyclone separator and returned for secondary drying. This device utilizes spray drying, which has high energy consumption and is prone to incomplete drying, requiring a secondary drying step. CN206392213U discloses a straw crushing and drying device, employing primary and secondary crushing to pulverize the material in two stages, with air blown in during the crushing process for drying. This device uses a simultaneous crushing and drying method; however, if there is too much material, the drying effect is poor; if there is too little material, it easily leads to uneven crushing and low crushing efficiency. Furthermore, the simultaneous crushing and drying can easily generate a large amount of powder.

[0006] Therefore, developing an integrated device for efficient drying and fine grinding has become the key to breaking through the high-value utilization of lignin. Utility Model Content

[0007] The purpose of this invention is to provide a lignin pulverizing and drying device system that integrates efficient drying and fine pulverizing of lignin, thereby improving the drying and pulverizing efficiency of lignin.

[0008] To achieve the objective of this utility model, the following technical solution is adopted:

[0009] This utility model provides a lignin pulverizing and drying device system, the lignin pulverizing and drying device system comprising:

[0010] The wet material crushing device, the double-pass drum drying device, the mechanical ultrafine crushing device, and the lignin separation and collection device are connected sequentially along the material flow direction.

[0011] The wet material pulverizing device is used to pulverize lignin wet material to generate pulverized wet material. The double-pass drum drying device is used to dry the pulverized wet material in two stages to generate dried lignin. The mechanical ultrafine pulverizing device is used to pulverize the dried lignin to generate lignin micro powder with particles at the micron or nanometer level. The lignin separation and collection device is used to separate and collect the lignin micro powder according to the particle size.

[0012] This utility model provides a lignin pulverizing and drying device system. First, wet lignin material is pulverized to a certain extent, then the pulverized wet material is dried, and finally, the dried lignin is finely pulverized. Combining wet and dry pulverization, wet pulverization ensures uniformity and heat exchange efficiency during the drying process, allowing the material to achieve the desired drying effect with low energy consumption. Simultaneously, the overall temperature of the lignin material is uniform during drying, avoiding problems such as carbonization or color darkening caused by localized overheating, resulting in high-quality dried lignin products. The dried material is then finely pulverized, achieving even higher pulverization efficiency and more uniform lignin particles compared to wet pulverization, ensuring the particle size of the finished lignin product meets application requirements. Finally, the lignin particles are separated and collected according to their size, thus completing an integrated process of drying, pulverizing, and collecting lignin materials.

[0013] Preferably, the feed inlet of the wet material crushing device is provided with a feed hopper.

[0014] Preferably, the lignin separation and collection device includes a cyclone separator and a bag filter connected in sequence along the material flow direction.

[0015] In this invention, the cyclone separator is used to separate and collect large particles in lignin powder. The particle size of the large particles can be determined according to the setting parameters of the cyclone separator or actual usage requirements. The remaining material in the lignin powder is collected by the bag filter.

[0016] Preferably, the double-pass drum drying device has two coaxially arranged double-layer drums, the double-layer drums including an inner drum and an outer drum rotating in opposite directions.

[0017] In this invention, the pulverized wet material first enters the inner drum of the double-pass drum drying device for the first stage of drying, and then enters the outer drum for the second stage of drying.

[0018] Preferably, a gas-water circulation device is provided between the gas outlet and the gas inlet of the double-pass drum dryer, and the gas-water circulation device is used for the treatment and recycling of the drying gas.

[0019] Preferably, the gas-water circulation device includes a drying fan, a water mist spray tower, a gas-water separation tower, and a heater, which are connected in sequence from the gas outlet to the gas inlet of the double-pass drum dryer.

[0020] In this invention, the water mist spray tower is used to spray dry waste gas to absorb and separate waste gas components in the dry waste gas, and the gas-water separation tower is used to separate gas and water to generate dry gas.

[0021] Preferably, the water mist spray tower is connected to a water mist spray tower circulation pump for circulating the spray liquid.

[0022] Preferably, the heater includes a primary heater and a secondary heater arranged sequentially along the gas flow direction.

[0023] Preferably, the lignin pulverizing and drying device system further includes a material conveying device.

[0024] Preferably, the material conveying device includes a wet material screw conveyor, which is disposed between the wet material crushing device and the double-pass drum drying device.

[0025] Preferably, the material conveying device includes a dry material screw conveyor, which is disposed between the double-pass drum drying device and the mechanical ultrafine pulverizing device.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The lignin pulverizing and drying device system provided by this utility model combines wet pulverization and dry pulverization. Wet pulverization ensures the uniformity of the material and the efficiency of heat exchange during the drying process, resulting in high-quality dried lignin products. The dried material is further finely pulverized on the basis of wet pulverization, making the lignin particles more uniform and ensuring that the particle size of the finished lignin product meets the application requirements. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the lignin pulverizing and drying device system provided in Example 1;

[0029] Among them, 1-feed hopper; 2-wet material crushing device; 3-wet material screw conveyor; 4-double-pass drum dryer; 5-dry material screw conveyor; 6-mechanical ultra-fine crushing device; 7-cyclone separator; 8-bag dust collector; 9-induced draft fan; 10-drying induced draft fan; 11-water mist spray tower; 12-water mist spray tower circulating pump; 13-gas-water separation tower; 14-heater. Detailed Implementation

[0030] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 this utility model.

[0031] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] This embodiment provides a method such as Figure 1 The lignin pulverizing and drying apparatus system shown includes:

[0035] The wet material crushing device 2, the double-pass drum drying device 4, the mechanical ultrafine crushing device 6, the cyclone separator 7, and the bag filter dust collector 8 are connected in sequence along the material flow direction.

[0036] The wet material crushing device 2 is used to crush lignin wet material. The feed inlet of the wet material crushing device 2 is provided with a feed hopper 1, through which the lignin wet material is fed into the wet material crushing device 2 for crushing and dispersion. The wet material crushing device 2 can be a two-stage wet material crusher. The wet material crushing device 2 adopts a conventional wet material crusher in the art, which is prior art, and its structure is not specifically limited here.

[0037] The double-pass drum dryer 4 is used to dry the pulverized wet material from the wet material pulverizer 2. The double-pass drum dryer 4 has two coaxially arranged drums, including an inner drum and an outer drum rotating in opposite directions. The inlet and outlet of the double-pass drum dryer 4 are located at one end. The pulverized wet material first enters the inner drum of the double-pass drum dryer 4 through the inlet for the first stage of drying, then enters the outer drum for the second stage of drying. After drying, it is output through the outlet. The double-pass drum dryer 4 uses a conventional double-layer drum dryer, which is prior art, and its structure is not specifically limited here.

[0038] The double-pass drum dryer 4 is provided with a gas inlet and a gas outlet at both ends. The drying gas enters the double-pass drum dryer 4 through the gas inlet, and the drying waste gas generated after drying is discharged through the gas outlet.

[0039] The gas inlet and gas outlet of the double-pass drum dryer 4 are connected by a gas-water circulation device.

[0040] The gas-water circulation device includes a drying induced draft fan 10, a water mist spray tower 11, a gas-water separation tower 13, and a heater 14, which are connected in sequence from the gas outlet to the gas inlet.

[0041] The drying exhaust fan 10 is used to extract the drying exhaust gas from the double-pass drum dryer 4 and transport it to the water mist spray tower 11. The water mist spray tower 11 is used to spray the drying exhaust gas, absorbing the exhaust gas components generated during drying and separating the air. A water mist spray tower circulation pump 12 is installed between the liquid outlet and liquid inlet of the water mist spray tower 11 for circulating spraying of the spray liquid. The gas-liquid separator 13 is used to separate the separated air into dry air. A condenser is installed in the gas-liquid separator 13. The heater 14 is used to heat the dry air to obtain hot air (70-75℃), which is then transported to the double-pass drum dryer 4 for drying. The heater 14 can be equipped with a primary heater and a secondary heater sequentially along the gas flow direction. The primary heater can introduce steam from other sections of the workshop as a heat source for preheating, thereby saving energy consumption. The secondary heater supplements the heating when the primary heating temperature is insufficient. The drying fan 10, water mist spray tower 11, gas-water separation tower 13 and heater 14 are all conventional devices in the field and are all existing technologies. Their structures are not specifically limited here.

[0042] The mechanical ultrafine pulverizing device 6 is used to pulverize dried lignin to the micron or nanometer scale. The mechanical ultrafine pulverizing device 6 can be at least one of airflow type, ball mill type, or vibration type. The mechanical ultrafine pulverizing device 6 uses a conventional ultrafine pulverizer in the art, which is prior art, and its structure is not specifically limited herein.

[0043] The cyclone separator 7 and bag filter 8 are used to separate and collect the lignin micro powder obtained by the mechanical ultrafine pulverizing device 6. The cyclone separator 7 separates large particles from the lignin micro powder. The particle size of the large particles can be determined according to the set parameters of the cyclone separator or actual usage requirements; for example, the particle size is above 5 μm. The separated large particles are collected from the bottom of the cyclone separator 7 into a material cylinder. The bag filter 8 collects the remaining small particles from the lignin micro powder. The small particles are collected from the bottom of the bag filter 8 into a material cylinder. An induced draft fan 9 is installed at the outlet of the bag filter 8 to extract and discharge the gas. The cyclone separator 7 and bag filter 8 are conventional devices in the art and are existing technology; therefore, their structure is not specifically limited here.

[0044] The lignin pulverizing and drying device system is equipped with a material conveying device. The material conveying device includes a wet material screw conveyor 3 and a dry material screw conveyor 5.

[0045] The wet material screw conveyor 3 is positioned between the wet material crushing device 2 and the double-pass drum drying device 4, and is used to convey the crushed wet lignin material. The dry material screw conveyor 5 is positioned between the double-pass drum drying device 4 and the mechanical ultrafine crushing device 6, and is used to convey the dried lignin. Both the wet material screw conveyor 3 and the dry material screw conveyor 5 are conventional screw conveyors in the art and are existing technologies; therefore, their structures are not specifically limited herein.

[0046] This embodiment also provides a method for pulverizing and drying lignin, the method comprising the following steps:

[0047] (1) The wet lignin material enters the wet material crushing device 2 through the feed hopper for crushing to obtain crushed wet lignin material, which is then conveyed to the double-pass drum drying device 4 by the wet material screw conveyor 3.

[0048] (2) The pulverized lignin wet material is dried in two stages in the double-pass drum dryer 4 through the inner drum and the outer drum. The drying temperature in the double-pass drum dryer 4 is 70-75℃ to obtain dried lignin. The dried lignin is conveyed to the mechanical ultra-fine pulverizing device 6 by the dry material screw conveyor 5. At the same time, the waste gas generated after drying is conveyed to the water mist spray tower 11 by the drying fan 10 to spray and absorb the waste gas components and separate the air. The separated air is separated from the water by the gas-water separation tower 13 to obtain dry air. The dry air is heated by the heater 14 and circulated to the double-pass drum dryer 4 for drying.

[0049] (3) The dried lignin is pulverized in the mechanical ultra-micro pulverizing device 6 to the micron or nano level to obtain lignin micro powder;

[0050] (4) The lignin powder enters the cyclone separator 7 to separate large lignin particles for collection, and the remaining lignin powder enters the bag filter dust collector 8 for collection.

[0051] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A lignin comminution drying apparatus system, characterized by, The lignin pulverizing and drying device system includes: The wet material crushing device, the double-pass drum drying device, the mechanical ultrafine crushing device, and the lignin separation and collection device are connected sequentially along the material flow direction. The wet material pulverizing device is used to pulverize lignin wet material to generate pulverized wet material. The double-pass drum drying device is used to dry the pulverized wet material in two stages to generate dried lignin. The mechanical ultra-micro pulverizing device is used to pulverize the dried lignin to generate lignin micro powder with particles at the micron or nanon level. The lignin separation and collection device is used to separate and collect the lignin micro powder according to the particle size.

2. The lignin comminution drying apparatus system of claim 1, wherein, The wet material crushing device is equipped with a feed hopper at its inlet.

3. The lignin comminution drying apparatus system of claim 1, wherein, The lignin separation and collection device includes a cyclone separator and a bag filter connected in sequence along the material flow direction.

4. The lignin comminution drying apparatus system of claim 1, wherein, The double-pass drum drying device has two coaxially arranged double-layer drums, which include an inner drum and an outer drum rotating in opposite directions.

5. The lignin comminution drying apparatus system of claim 1, wherein, A gas-water circulation device is provided between the gas outlet and the gas inlet of the double-pass drum dryer. The gas-water circulation device is used for the treatment and recycling of the drying gas.

6. The lignin comminution drying apparatus system of claim 5, wherein, The gas-water circulation device includes a drying fan, a water mist spray tower, a gas-water separation tower, and a heater, which are connected sequentially from the gas outlet to the gas inlet of the double-pass drum dryer.

7. The lignin comminution drying apparatus system of claim 6, wherein, The water mist spray tower is connected to a water mist spray tower circulation pump for circulating the spray liquid; The heater includes a primary heater and a secondary heater arranged sequentially along the gas flow direction.

8. The lignin comminution drying apparatus system of claim 1, wherein, The lignin pulverizing and drying device system also includes a material conveying device.

9. The lignin comminution drying apparatus system of claim 8, wherein, The material conveying device includes a wet material screw conveyor, which is arranged between the wet material crushing device and the double-pass drum drying device.

10. The lignin comminution drying apparatus system of claim 8, wherein, The material conveying device includes a dry material screw conveyor, which is arranged between the double-pass drum drying device and the mechanical ultrafine pulverizing device.

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