Biomass deliming treatment method for cyclic utilization of acetic acid immersion cleaning

Abstract

The invention discloses a biomass deliming treatment method for cyclic utilization of acetic acid immersion cleaning, and relates to the technical field of biomass deliming treatment.The method comprises the following steps that biomass raw materials are crushed, and high-ash biomass to be treated is obtained; putting the high-ash biomass into an acetic acid leaching solution for first-stage leaching, and carrying out solid-liquid separation to obtain low-ash biomass and first leaching tail liquid; the low-ash biomass is put into a clean water immersion cleaning solution for second-stage immersion cleaning, and ultralow-ash biomass and second immersion cleaning tail liquid are obtained through solid-liquid separation; wherein the acetic acid immersion cleaning solution is composed of a first immersion cleaning tail solution, a second immersion cleaning tail solution and acetic acid, cyclic utilization of acetic acid can be achieved, the amount of acetic acid and the amount of water needed by biomass deliming treatment are greatly reduced, waste of resources is reduced, and therefore the cost of biomass deliming treatment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of biomass deashing treatment, and in particular to a biomass deashing treatment method by recycling acetic acid leaching. Background Art

[0002] In related technologies, the energy utilization of biomass is an important way to achieve the goals of "carbon peak and carbon neutrality". my country's installed capacity of biomass power generation has increased year by year, but the ash of biomass contains a high proportion of alkali metals and alkaline earth metals, which causes slagging, corrosion and even explosion in the furnace during the combustion process. Therefore, it is particularly important to remove the ash from biomass before burning it for power generation. At present, biomass deashing technologies mainly include water washing, organic acid washing, inorganic acid washing, etc. Although the immersion treatment can effectively solve the problem of high ash content in biomass, a large amount of water and acetic acid are consumed in this process, resulting in waste of water resources and increased treatment costs. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a biomass deashing treatment method by recycling acetic acid leaching, which can reduce the amount of acetic acid and water used and reduce the cost of biomass raw material deashing treatment.

[0004] The biomass deashing treatment method of recycling acetic acid leaching according to the embodiment of the present invention comprises the following steps:

[0005] crushing the biomass raw materials to obtain high-ash biomass to be processed;

[0006] The high-ash biomass is placed in an acetic acid leaching solution for first-stage leaching, and low-ash biomass and a first leaching tail liquid are obtained through solid-liquid separation;

[0007] The low-ash biomass obtained above is put into a clean water leaching liquid for a second stage of leaching, and ultra-low-ash biomass and a second leaching tail liquid are obtained through solid-liquid separation;

[0008] Wherein, in the first stage of leaching, the acetic acid leaching solution is composed of the first leaching tail liquid, the second leaching tail liquid and acetic acid.

[0009] The biomass deashing treatment method of the embodiment of the present invention crushes the biomass raw material and then sequentially subjects the biomass raw material to a first stage leaching and a second stage leaching, thereby effectively separating out the ash of the biomass raw material. The acetic acid leaching liquid used in the first stage leaching is composed of a first leaching tail liquid, a second leaching tail liquid and acetic acid, thereby enabling the recycling of acetic acid, greatly reducing the amount of acetic acid and water required for biomass deashing treatment, reducing waste of resources, and thus reducing the cost of biomass deashing treatment.

[0010] According to some embodiments of the present invention, after crushing, the particle size of the high-ash biomass to be processed is 3 cm to 8 cm.

[0011] According to some embodiments of the present invention, in the first stage of leaching, the concentration of the acetic acid leaching solution is 0.5 mol / L to 3 mol / L.

[0012] According to some embodiments of the present invention, the clean water rinsing liquid of the second stage rinsing is tap water.

[0013] According to some embodiments of the present invention, in the first stage of leaching, the mixing ratio of the acetic acid leaching solution and the high-ash biomass is (10-20):1.

[0014] According to some embodiments of the present invention, in the first stage of soaking, the soaking time of the high-ash biomass is 2 hours to 6 hours.

[0015] According to some embodiments of the present invention, in the first stage of leaching, the high-ash biomass and the acetic acid leaching solution are placed in a first drum device for stirring to precipitate ash from the high-ash biomass.

[0016] According to some embodiments of the present invention, the stirring speed of the first drum device is 60 r / min to 200 r / min.

[0017] According to some embodiments of the present invention, in the second stage of soaking, the low-ash biomass and the clean water soaking liquid are placed in a second drum device for stirring to precipitate ash from the low-ash biomass.

[0018] According to some embodiments of the present invention, the first roller device and the second roller device are the same roller device.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 It is a schematic flow chart of the biomass deashing treatment method of recycling acetic acid leaching of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a drum body of a drum device according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of a driving assembly of a roller device according to an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of an operation panel of a driving assembly of a drum device according to an embodiment of the present invention;

[0025] Reference numerals:

[0026] 1. Cylinder cover; 2. Material door; 3. Rotating block; 4. Clamping block; 5. Indicator light; 6. First knob; 7. Second knob; 8. Third knob; 9. Support shaft; 10. Drive shaft; 11. Tank chain; 12. Drive motor; 13. Cylinder body; 14. Fixing rod. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In related technologies, the energy utilization of biomass is an important way to achieve the goals of "carbon peak and carbon neutrality". my country's installed capacity of biomass power generation has increased year by year, but the ash of biomass contains a high proportion of alkali metals and alkaline earth metals, which causes slagging, corrosion and even explosion in the furnace during the combustion process. Therefore, it is particularly important to remove the ash from biomass before burning it for power generation. At present, biomass deashing technologies mainly include water washing, organic acid washing, inorganic acid washing, etc. Although the immersion treatment can effectively solve the problem of high ash content in biomass, a large amount of water and acetic acid are consumed in this process, resulting in waste of water resources and increased treatment costs.

[0032] To this end, the present invention provides a biomass deashing treatment method that recycles acetic acid leaching, which can reduce the amount of acetic acid and water used and reduce the cost of deashing treatment of biomass raw materials.

[0033] In some embodiments of the present invention, the biomass raw material may be agricultural and forestry waste, such as bark, leaves, sawdust, straw, etc., or may be natural plants such as seaweed. The biomass raw material is crushed, and the particle size is greater than or equal to 3 cm, for example, it may be 3 cm, 5 cm or 7 cm, etc. The particles after the biomass raw material is crushed are defined as high-ash biomass. Due to its high dust content, the high-ash biomass needs to be soaked.

[0034] Reference Figure 1 Specifically, the biomass deashing treatment method provided by the present invention comprises the following steps:

[0035] Crushing the biomass raw material to obtain the high-ash biomass to be processed, wherein, in some embodiments, after crushing, the particle size of the high-ash biomass to be processed is 3 cm to 8 cm, so that the particle size of the high-ash biomass is not too large to affect the deashing efficiency;

[0036] The high-ash biomass is placed in an acetic acid leaching solution for first-stage leaching, and low-ash biomass and a first leaching tail liquid are obtained through solid-liquid separation;

[0037] The low-ash biomass obtained above is put into a clean water leaching liquid for a second stage of leaching, and ultra-low-ash biomass and a second leaching tail liquid are obtained through solid-liquid separation;

[0038] The acetic acid leaching solution of the first stage of leaching is composed of the first leaching tail liquid, the second leaching tail liquid and acetic acid. Specifically, the acetic acid leaching solution of the first stage of leaching is composed of part of the first leaching tail liquid retained in the previous batch, all of the second leaching tail liquid in the previous batch and an appropriate amount of high-concentration acetic acid. Of course, the first batch of acetic acid leaching solution can be directly prepared by mixing high-concentration acetic acid and clean water.

[0039] The biomass deashing treatment method of the embodiment of the present invention crushes the biomass raw material and then sequentially subjects the biomass raw material to a first stage leaching and a second stage leaching, thereby effectively separating out the ash of the biomass raw material. The acetic acid leaching liquid used in the first stage leaching is composed of a first leaching tail liquid, a second leaching tail liquid and acetic acid, thereby enabling the recycling of acetic acid, greatly reducing the amount of acetic acid and water required for biomass deashing treatment, reducing waste of resources, and thus reducing the cost of biomass deashing treatment.

[0040] It can be understood that in some embodiments of the present invention, in the first stage of soaking, the concentration of the acetic acid soaking solution is 0.5 mol / L to 3 mol / L. Within this concentration range, the acetic acid soaking solution can more fully precipitate the ash in the high-ash biomass, thereby obtaining low-ash biomass.

[0041] It can be understood that in some embodiments of the present invention, the clean water for washing in the second stage is tap water, which has low cost and is easy to obtain, and is conducive to reducing the cost and difficulty of biomass deashing treatment.

[0042] It is understood that in some embodiments of the present invention, in the first stage of leaching, the mixing ratio of the acetic acid leaching solution and the high-ash biomass is (10-20): 1. Within this ratio range, the ratio of the acetic acid leaching solution to the high-ash biomass is suitable, which can avoid waste caused by excessive acetic acid leaching solution, or avoid the ash of the high-ash biomass from being unable to be effectively precipitated due to too little acetic acid leaching solution. In a specific embodiment, the mixing ratio of the acetic acid leaching solution and the high-ash biomass is 15: 1. At this time, the acetic acid leaching solution can fully soak the high-ash biomass, so that the ash of the high-ash biomass can be effectively precipitated.

[0043] It can be understood that in some embodiments of the present invention, in the first stage of soaking, the soaking time of the high-ash biomass is 2 hours to 6 hours. By setting a suitable soaking time, the ash in the high-ash biomass can be fully separated out.

[0044] It can be understood that in order to improve the efficiency of ash precipitation from high-ash biomass, in some embodiments of the present invention, in the first stage of leaching, the high-ash biomass and acetic acid leaching solution are placed in a first drum device for stirring, so that the high-ash biomass can be fully mixed with the acetic acid leaching solution, thereby quickly precipitating the ash of the high-ash biomass.

[0045] It can be understood that in some embodiments of the present invention, the stirring speed of the first drum device is 60r / min to 200r / min. By setting a reasonable stirring speed, the ash of high-ash biomass can be precipitated more quickly, thereby improving the deashing efficiency.

[0046] It can be understood that in order to improve the deashing efficiency of low-ash biomass, in some embodiments of the present invention, in the second stage of soaking, the low-ash biomass and the clean water soaking liquid are placed in a second drum device for stirring, so that the low-ash biomass can be fully mixed with the clean water soaking liquid, so that the ash of the low-ash biomass can be quickly precipitated.

[0047] It is understandable that in order to make the deliming treatment device simpler, in some embodiments of the present invention, the first roller device and the second roller device are the same roller device, so there is no need to set up two roller devices, thereby reducing the cost of the deliming treatment.

[0048] The present invention utilizes the tail liquid in the previous batch and adds an appropriate amount of acetic acid to obtain an acetic acid leaching liquid for biomass deashing, and utilizes a drum device to efficiently remove ash from the biomass. The clean water added in the second stage of leaching can form a new mass transfer system with the acid-washed low-ash biomass again, thereby removing more ash. The above-mentioned biomass deashing treatment method requires less water and acetic acid, can effectively reduce the ash content in the biomass, reduce energy loss, and can achieve a higher biomass deashing amount at a lower liquid-solid ratio.

[0049] The following are some specific embodiments of the biomass deashing treatment method of the present invention:

[0050] Comparative Example 1

[0051] Eucalyptus bark is used as the biomass raw material. The eucalyptus bark is crushed to a particle size of about 3 cm. The eucalyptus bark is crushed to less than 1 mm using a high-speed crusher. 1g±0.1g of eucalyptus bark powder is accurately weighed, and the mass is recorded as m0. Take an ash dish and record its weight as m1. Add the eucalyptus bark ash into the ash dish, put the ash dish into the constant temperature zone of the muffle furnace, adjust the muffle furnace heating program, from room temperature to 250℃ in 1 hour, stay at 250℃ for 1 hour, and then rise to 550℃ after 40 minutes, and end the program after staying at 550℃ for 2 hours. Take the ash dish out of the muffle furnace and place it in a dryer to cool. After cooling to room temperature, weigh the total mass of the ash dish and the ash therein m2, and calculate the ash content by the following formula:

[0052] (m2-m1) / m0×100%=ash content of the original eucalyptus bark. The ash content of the original eucalyptus bark was measured to be 4.35wt%.

[0053] Comparative Example 2

[0054] Accurately weigh 0.2g of eucalyptus bark powder with a particle size of less than 1 mm and add it to a 50ml polytetrafluoroethylene digestion tank, add 5ml nitric acid, and then add 2ml hydrogen peroxide to seal the digestion tank. After digestion at room temperature for 10min, put it into a microwave digestion instrument, digest it for 5min at a power of 800W, cool it for 10min, and then digest it for 5min under the same conditions. After digestion, take 1ml of the digestion solution and dilute it to 50ml with deionized water for inductively coupled plasma emission spectrometer (ICP-OES) detection. It is measured that the potassium ion content in the eucalyptus bark is 4.501mg / g, the magnesium ion content is 1.980mg / g, and the calcium ion content is 6.453mg / g.

[0055] Example 1

[0056] Taking eucalyptus bark as the original biomass, the eucalyptus bark was crushed into high-ash biomass with a particle size of 3 cm, 50g of high-ash biomass and 300ml of clean water tail liquid, 28.5ml of 17.5mol / L acetic acid solution and 171ml of acetic acid tail liquid were put into a drum device, the rotation speed of the drum device was 180r / min, and after soaking for 1h, solid-liquid separation was performed to obtain low-ash biomass; 300ml of clean water and the above-mentioned low-ash biomass after acid washing were put into the drum device and soaked again for 1h.

[0057] The dried eucalyptus bark was taken and its ash content was measured by the method in Comparative Example 1. The deashing rate was calculated by the following formula:

[0058] Deashing rate = (ash content of original eucalyptus bark - ash content of deashed eucalyptus bark) / ash content of original eucalyptus bark × 100%.

[0059] 5 ml of the leaching solution was collected and the concentrations of potassium, magnesium and calcium ions therein were detected by ICP-OES.

[0060] The ash content of the eucalyptus bark after deashing pretreatment was measured to be 1.45wt%. Combining the ash content and metal ion content of the eucalyptus bark in Comparative Example 1 and Comparative Example 2, the deashing rate was calculated to be 62.35%, the removal rate of potassium ions in the eucalyptus bark was 91.23%, the removal rate of magnesium ions was 72.15%, and the removal rate of calcium ions was 22.41%.

[0061] Example 2

[0062] Eucalyptus bark is used as the biomass raw material, and the eucalyptus bark is crushed into high-ash biomass with a particle size of 3 cm. 50g of high-ash biomass and 300ml of clean water tail liquid, 28.5ml of 17.5mol / L acetic acid solution and 171ml of acetic acid tail liquid are put into a drum device. The rotation speed of the drum device is 180r / min. After soaking for 3 hours, solid-liquid separation is performed to obtain low-ash biomass; 300ml of clean water and the above-mentioned low-ash biomass after acid washing are put into the drum device and soaked again for 3 hours.

[0063] The dried eucalyptus bark was taken and its ash content was measured by the method in Comparative Example 1. The deashing rate was calculated by the following formula:

[0064] Deashing rate = (ash content of original eucalyptus bark - ash content of deashed eucalyptus bark) / ash content of original eucalyptus bark × 100%.

[0065] 5 ml of the leaching solution was collected and the concentrations of potassium, magnesium and calcium ions therein were detected by ICP-OES.

[0066] The ash content of the eucalyptus bark after deashing pretreatment was measured to be 0.90wt%. Combining the ash content and metal ion content of the eucalyptus bark in Comparative Example 1 and Comparative Example 2, the deashing rate was calculated to be 80.62%, the removal rate of potassium ions in the eucalyptus bark was 92.47%, the removal rate of magnesium ions was 72.55%, and the removal rate of calcium ions was 27.51%. It can be seen that the deashing rate can be effectively increased by increasing the soaking time of the biomass.

[0067] Example 3

[0068] Eucalyptus bark is used as the biomass raw material, and the eucalyptus bark is crushed into high-ash biomass with a particle size of 3 cm. 50g of high-ash biomass and 500ml of clean water tail liquid, 28.5ml of 17.5mol / L acetic acid solution and 0ml of acetic acid tail liquid are put into a drum device. The rotation speed of the drum device is 180r / min. After soaking for 1h, solid-liquid separation is performed to obtain low-ash biomass; 500ml of clean water and the above-mentioned low-ash biomass after acid washing are soaked again in the drum device for 1h.

[0069] The dried eucalyptus bark was taken and its ash content was measured by the method in Comparative Example 1. The deashing rate was calculated by the following formula:

[0070] Deashing rate = (ash content of original eucalyptus bark - ash content of deashed eucalyptus bark) / ash content of original eucalyptus bark × 100%.

[0071] 5 ml of the leaching solution was collected and the concentrations of potassium, magnesium and calcium ions therein were detected by ICP-OES.

[0072] The ash content of the eucalyptus bark after deashing pretreatment was measured to be 0.95wt%. Combining the ash content and metal ion content of the eucalyptus bark in Comparative Example 1 and Comparative Example 2, the deashing rate was calculated to be 79.22%, the removal rate of potassium ions in the eucalyptus bark was 91.88%, the removal rate of magnesium ions was 70.75%, and the removal rate of calcium ions was 20.51%.

[0073] Example 4

[0074] Eucalyptus bark is used as the biomass raw material, and the eucalyptus bark is crushed into high-ash biomass with a particle size of 3 cm. 50g of high-ash biomass and 300ml of clean water tail liquid, 85.5ml of 17.5mol / L acetic acid solution and 114.5ml of acetic acid tail liquid are put into a drum device. The rotation speed of the drum device is 180r / min. After soaking for 1h, solid-liquid separation is performed to obtain low-ash biomass; 300ml of clean water and the above-mentioned low-ash biomass after acid washing are soaked again in the drum device for 1h.

[0075] The dried eucalyptus bark was taken and its ash content was measured by the method in Comparative Example 1. The deashing rate was calculated by the following formula:

[0076] Deashing rate = (ash content of original eucalyptus bark - ash content of deashed eucalyptus bark) / ash content of original eucalyptus bark × 100%.

[0077] 5 ml of the leaching solution was collected and the concentrations of potassium, magnesium and calcium ions therein were detected by ICP-OES.

[0078] The ash content of the eucalyptus bark after deashing pretreatment was measured to be 1.22wt%. Combining the ash content and metal ion content of the eucalyptus bark in Comparative Example 1 and Comparative Example 2, the deashing rate was calculated to be 73.85%, the removal rate of potassium ions in the eucalyptus bark was 94.88%, the removal rate of magnesium ions was 75.62%, and the removal rate of calcium ions was 28.12%.

[0079] Reference Figures 2 to 4 It can be understood that the drum device used in the above-mentioned biomass deashing treatment method includes a drum body and a driving assembly, and a receiving cavity is provided inside the drum body, and the receiving cavity can be used to place the biomass raw material and the corresponding soaking liquid. The driving assembly is used to drive the drum body to rotate, so that the biomass raw material and the soaking liquid in the receiving cavity of the drum body can be fully mixed and contacted during rolling, which greatly improves the deashing efficiency and deashing effect of the biomass raw material.

[0080] When the drum device is used to perform soaking and deliming pretreatment on biomass raw materials, the biomass raw materials and the corresponding soaking liquid are first placed in the accommodating chamber of the drum, and then the driving component is started so that the driving component can drive the drum to rotate. At this time, the biomass raw materials and the soaking liquid rotate and roll in the accommodating chamber as the drum rotates, so that the biomass raw materials and the soaking liquid can be fully mixed. Compared with the traditional device that uses the soaking liquid to spray the biomass raw materials for deliming pretreatment, the drum device changes the process of the biomass raw material soaking pretreatment stage, and strengthens the solid-liquid reaction of the biomass raw material and the soaking liquid by rotating and rolling, thereby improving the deliming efficiency of the biomass raw material and reducing the time of the deliming pretreatment. Moreover, placing the biomass raw material and the soaking liquid in a closed accommodating chamber for mixing can effectively reduce the impact of the soaking liquid volatilizing to the outside world, further improving the deliming efficiency and deliming effect of the biomass raw material.

[0081] Reference Figure 2 It can be understood that in some embodiments of the present invention, the cylinder includes a barrel 13 and a barrel cover 1, the barrel 13 is placed in a horizontal direction, and the number of barrel covers 1 is two. The two barrel covers 1 can be respectively sealed at the two ends of the barrel 13 along the axial direction by welding or bonding, so that the barrel cover 1 and the barrel 13 can be surrounded to form a receiving cavity. Specifically, the barrel 13 is roughly cylindrical, and the barrel 13 can be made of a plastic polymer material. For example, the barrel 13 can be made of acrylic. Acrylic has good acid and alkali resistance, so that it can still maintain a stable structure under the immersion of the soaking liquid, which is conducive to maintaining the long-term stable operation of the through device. Of course, the barrel 13 made of acrylic also has good transparency, so that the staff can intuitively know the conditions of the biomass raw materials and the soaking liquid in the receiving cavity, so as to facilitate the staff to take corresponding operations. Of course, in order to make the biomass raw material in the accommodating cavity more fully contact with the soaking liquid, the inner wall of the cylinder body 13 can be provided with a protruding structure, which can make the soaking liquid generate a local vortex during the rotation of the cylinder, and the rotation direction of the vortex is inconsistent with the rotation direction of the cylinder, so that the soaking liquid can rinse and mix the biomass raw material in more directions, which is conducive to making the ash of the biomass raw material precipitate more quickly, thereby further improving the efficiency of deashing the biomass raw material. Of course, a plurality of protruding structures can be provided, and a plurality of protruding structures can be staggered and separated along the rotation direction of the cylinder, so as to better promote the deashing of the biomass raw material.

[0082] It is understandable that, in order to enable the drive assembly to drive the barrel to rotate, in some embodiments of the present invention, the drive assembly includes a drive shaft 10, and the drive shaft 10 can drive the barrel cover 1 to rotate. For example, the outer wall of the drive shaft 10 can be provided with a transmission tooth, and the outer wall of the barrel cover 1 can be provided with a driven tooth, and the transmission tooth and the driven tooth are meshed, so that the drive shaft 10 can drive the barrel cover 1 to rotate. Of course, other transmission structures can also be used between the drive shaft 10 and the barrel cover 1 to transmit power, for example, a belt drive or a chain drive can be used between the drive shaft 10 and the barrel cover 1.

[0083] It is understandable that in some embodiments of the present invention, the drive assembly further includes a drive motor 12 and a base. The base may be a frame structure, which may include a panel and a support frame located inside the panel. The drive motor 12 may be disposed inside the panel, thereby realizing concealed installation and reducing the impact of the outside world on the drive motor 12. The drive shaft 10 may be rotatably mounted on the upper end of the base. For example, a rolling bearing may be installed on the panel, and the drive shaft 10 may be fixedly mounted on the inner ring of the rolling bearing, so that the drive shaft 10 may rotate relative to the base. The drive motor 12 is connected to the drive shaft 10 in a transmission manner. For example, a chain transmission may be adopted. The drive motor 12 may drive the drive shaft 10 to rotate through the tank chain 11. In order to make the overall structure of the device simpler and lighter, the barrel can be placed on the upper end of the base, and the outer diameter of the barrel cover 1 is larger than the outer diameter of the barrel body 13, so that the barrel cover 1 can abut against the upper end of the drive shaft 10. Under the gravity of the soaking liquid and biomass raw materials in the barrel and the accommodating cavity, the barrel cover 1 can be closely attached to the upper surface of the drive shaft 10, so that there is no need to adopt other transmission structures. The drive shaft 10 can drive the barrel cover 1 to rotate by friction, thereby rotating the barrel. Specifically, the barrel cover 1 can be made of an elastic structure, such as rubber. Under the action of gravity, the barrel cover 1 is closely attached to the upper end of the drive shaft 10, and because the barrel cover 1 is elastic, the barrel cover 1 can be deformed and better attached to the upper end of the drive shaft 10, so that the contact area between the barrel cover 1 and the drive shaft 10 is larger, which is conducive to the drive shaft 10 driving the barrel cover 1 to rotate by friction, and then the barrel rotates to fully mix the biomass raw materials and the soaking liquid, thereby achieving rapid deashing.

[0084] It should be noted that, in order to make the cylinder body rotate more smoothly, in some embodiments of the present invention, the driving assembly also includes a support shaft 9, which can be rotatably mounted on the upper end of the base and spaced apart from the driving shaft 10, and the cylinder cover 1 can abut against the support shaft 9, so that when the cylinder cover 1 rotates, the support shaft 9 can support the cylinder cover 1 in rotation, so that the force on the cylinder cover 1 is more balanced, which is conducive to improving the stability of the cylinder body rotation. Specifically, the support shaft 9 can also be rotatably mounted on the enclosure of the base through a rolling bearing, and the outer diameter of the support shaft 9 can be the same as or different from the outer diameter of the driving shaft 10, and can be specifically set according to actual needs.

[0085] It is understandable that, in order to facilitate the placement and removal of materials such as the soaking liquid and biomass raw materials into and out of the accommodating chamber, in some embodiments of the present invention, at least one of the barrel covers 1 is provided with a material port, and the barrel cover 1 is also provided with a material door 2 movably sealed at the material port. When it is necessary to put materials into the accommodating chamber, the operator can open the material door 2, and then put the soaking liquid, biomass raw materials and other materials into the accommodating chamber from the material port, and finally close the material door 2. Similarly, when it is necessary to take out the materials in the accommodating chamber, the operator can open the material door 2, and then take the materials out of the accommodating chamber, which is very convenient to operate.

[0086] It can be understood that in order to prevent the material in the accommodating chamber from leaking from the accommodating chamber to the outside of the cylinder, in some embodiments of the present invention, a sealing ring is provided on the outer edge of the material port. The sealing ring can be made of rubber or silicone or other elastic materials. Of course, the sealing ring also has good acid and alkali resistance. When the material door 2 is sealed at the material port, the inner wall of the material door 2 can abut against the sealing ring, so that the material door 2 can seal the material port, so that when the cylinder rotates, the soaking liquid and the material in the accommodating chamber can be fully mixed with the rotation of the cylinder and quickly deashed, and at the same time, the soaking liquid can be prevented from leaking out of the material port, thereby avoiding the problem of low deashing effect caused by leakage and volatilization of the soaking liquid during the deashing process, further improving the deashing effect of the device.

[0087] It should be noted that a certain vibration will be generated when the cylinder rotates. At this time, the material door 2 is easily loosened due to the vibration, resulting in failure of the seal on the material port. For this reason, in some embodiments of the present invention, the cylinder is also provided with a limiting mechanism, and the limiting mechanism can lock the material door 2 to the material port, so that during the rotation of the cylinder, the material door 2 can also remain firmly sealed on the material port, thereby effectively preventing the soaking liquid in the accommodating chamber from leaking to the outside and affecting the deashing effect of the biomass raw material.

[0088] Reference Figure 4Specifically, in some embodiments of the present invention, the limiting mechanism includes a fixed rod and a rotating block 3, the fixed rod 14 is installed on the cylinder cover 1, the rotating block 3 can be rotatably sleeved on the fixed rod 14, and the rotating block 3 can rotate around the fixed rod 14 to press or loosen the material door 2. The end of the cylinder cover 1 away from the cylinder body 13 is provided with two spaced clamping blocks 4, and the clamping blocks 4 are provided with a clamping hole adapted to the fixed rod 14. The fixed rod 14 is clamped on the clamping block 4 by inserting the clamping hole, so that the fixed rod 14 can be fixedly installed on the end of the cylinder cover 1. One end of the rotating block 3 extends outward, and the other end is provided with a bayonet. The rotating block 3 can be sleeved on the outer wall of the fixed rod 14 through the bayonet, and can rotate relative to the fixed rod 14, so that the end of the rotating block 3 protruding outward can abut against the material door 2 to lock the material door 2 at the material port, or by rotating the rotating block 3 in the opposite direction, the end of the rotating block 3 protruding outward can be away from the material door 2, so that the material door 2 can be removed from the material port conveniently. Of course, the rotating block 3 can be made of a material with a certain elasticity, such as a rubber block, so that the rotating block 3 can be more easily connected to the fixed rod through the bayonet, and when the end of the rotating block 3 abuts against the material door 2, it can be deformed by force and better fit against the material door 2. The fixed rod 14 can be made of a material with a relatively high strength, such as stainless steel or other metal materials.

[0089] Reference Figure 3 It can be understood that in order to facilitate the relevant operation control of the drive component, in some embodiments of the present invention, the drive component also includes an operation panel, and the operation panel is provided with a first knob 6, a second knob 7 and a third knob 8. The first knob 6 is used to adjust the rotation speed of the cylinder, the second knob 7 is used to adjust the rotation time of the cylinder, and the third button is used to adjust the direction of the cylinder. Of course, the operation panel is also provided with an operation indication light. When performing the pretreatment of leaching and deashing of biomass raw materials, the operator can adjust the rotation speed of the drive motor 12 through the first knob 6, thereby adjusting the rotation speed of the cylinder; and can adjust the running time of the drive motor 12 through the second knob 7, thereby adjusting the rotation time of the cylinder; and can adjust the direction of the drive motor 12 through the third knob 8, thereby adjusting the direction of the cylinder, so that the drum device of the present invention can more fully mix the biomass raw materials in the accommodating cavity with the leaching liquid, strengthen the solid-liquid reaction between the two, and improve the deashing efficiency of the biomass raw materials.

[0090] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A biomass deashing treatment method using acetic acid for recycling, characterized in that: The following steps are involved: crushing the biomass raw materials to obtain high-ash biomass to be processed; The high-ash biomass is placed in an acetic acid leaching solution for first-stage leaching, and low-ash biomass and a first leaching tail liquid are obtained through solid-liquid separation; The low-ash biomass obtained above is placed in a clean water leaching liquid for second-stage leaching, and ultra-low-ash biomass and second leaching tail liquid are obtained through solid-liquid separation; Wherein, in the first stage of leaching, the acetic acid leaching solution is composed of the first leaching tail liquid, the second leaching tail liquid and acetic acid.

2. The biomass deashing treatment method of recycling acetic acid leaching according to claim 1 is characterized in that: After crushing, the particle size of the high-ash biomass to be processed is 3 cm to 8 cm.

3. The biomass deashing treatment method of recycling acetic acid leaching according to claim 1 is characterized in that: In the first stage of leaching, the concentration of the acetic acid leaching solution is 0.5 mol / L to 3 mol / L.

4. The biomass deashing treatment method of recycling acetic acid leaching according to claim 1 is characterized in that: The clean water rinsing liquid in the second stage rinsing is tap water.

5. The biomass deashing treatment method of recycling acetic acid leaching according to claim 1, characterized in that: In the first stage of soaking, the mixing ratio of the acetic acid soaking solution and the high-ash biomass is (10-20):

1.

6. The biomass deashing treatment method of recycling acetic acid leaching according to claim 1, characterized in that: In the first stage of soaking, the soaking time of the high-ash biomass is 2 hours to 6 hours.

7. The biomass deashing treatment method of recycling acetic acid leaching according to claim 1, characterized in that: In the first stage of soaking, the high-ash biomass and the acetic acid soaking solution are placed in a first drum device for stirring to precipitate the ash of the high-ash biomass.

8. The biomass deashing treatment method of recycling acetic acid leaching according to claim 7, characterized in that: The stirring speed of the first roller device is 60 r / min to 200 r / min.

9. The biomass deashing treatment method of recycling acetic acid leaching according to claim 7, characterized in that: In the second stage of soaking, the low-ash biomass and the clean water soaking liquid are placed in a second drum device for stirring to precipitate the ash of the low-ash biomass.

10. The biomass deashing treatment method of recycling acetic acid leaching according to any one of claims 1 to 9, characterized in that: The first roller device and the second roller device are the same roller device.

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