A biomass-based ethanol fermentation conversion reaction device and method

Abstract

The present invention belongs to the technical field of ethanol fermentation, and specifically relates to a biomass-based ethanol fermentation conversion reaction device and method, comprising a fermentor, a fermentation chamber inside the fermentor, an agitator provided in the fermentation chamber, a power device for the agitator located at the top of the fermentor, a ventilation component provided at the bottom of the fermentor, the ventilation component communicating with the interior of the fermentor, and a temperature control component provided on the side wall of the fermentor; the present invention provides a screening bucket at the middle position of the bottom of the fermentation chamber, confines solid raw material particles that aggregate into agglomerates in the fermentation raw materials to the interior of the screening bucket, and then stirs them with a slowly rotating stirring plate to break and disperse them, and fully mix them with the inflowing liquid raw material, thereby avoiding the situation where solid particles aggregate into agglomerates, resulting in the expansion of anoxic areas that affect the smooth progress of fermentation, ensuring the quality of the fermentation liquid, and further improving the ethanol conversion efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of ethanol fermentation, and in particular relates to a biomass-based ethanol fermentation conversion reaction device and method. Background Art

[0002] The second generation of biomass-based liquid fuels is produced using non-grain lignocellulosic biomass, such as straw and wood, as raw materials. The preparation process mainly uses ethanol fermentation conversion technology based on lignocellulosic biomass to convert biomass raw materials into ethanol.

[0003] During the actual operation, the processing personnel found that the pre-treated fermentation raw materials still contained a large amount of solid particles. These solid particles in the fermentation raw materials are prone to aggregate into clumps due to the adhesion of the sugar components they contain, and accumulate at the bottom of the fermentation tank. These agglomerated raw materials are not in sufficient contact with the fermentation strains, and the fermentation is not thorough. In addition, the aggregated solid particles are easy to isolate oxygen, resulting in insufficient contact between the wrapped part of the raw materials and oxygen, and the emergence of anaerobic areas, which leads to the massive reproduction of some anaerobic microorganisms, thereby producing odorous substances and even harmful substances, affecting the quality of the fermentation liquid. Summary of the Invention

[0004] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a biomass-based ethanol fermentation conversion reaction device and method.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the present invention proposes a biomass-based ethanol fermentation conversion reaction device, comprising a fermentor, a fermentation chamber inside the fermentor is provided with an agitator, a power device for the agitator is located at the top of the fermentor, a ventilation assembly is provided at the bottom of the fermentor, the ventilation assembly is communicated with the interior of the fermentor, and a temperature control assembly is provided on the side wall of the fermentor;

[0006] The stirring shaft of the stirrer is located in the middle of the fermentation chamber, and the stirring plate is located on the stirring shaft. A screening bucket is provided near the bottom of the fermentation chamber. The stirring shaft slides through the middle of the screening bucket, and screening holes are evenly provided at the bottom of the screening bucket. The screening bucket is connected to the output end of the telescopic device provided at the bottom of the fermentation tank.

[0007] Preferably, guide plates are evenly arranged on the inner wall of the vertical portion of the screening bucket, the guide plates are distributed in a ring around the stirring shaft, and the ends of the guide plates are all inclined along the same rotation direction.

[0008] Preferably, breaking blocks are evenly arranged on the surface of the end of the guide plate close to the stirring shaft, and the end of the breaking block is a sharp structure.

[0009] Preferably, the vertical part of the screening bucket is hollow inside to form an inflation cavity, the inflation cavity is communicated with the ventilation component through an inflation pipe, and inflation holes are evenly provided on the inner wall of the vertical part of the screening bucket, the inflation holes are communicated with the inside of the inflation cavity, and the inflation holes are distributed in the gaps between the guide plates.

[0010] Preferably, the bottom of the screening bucket is a double-layer structure, including a fixed layer and a deformable layer. The fixed layer is made of a rigid material, and the deformable layer is made of an elastic material. A clearance gap is formed in the area between the fixed layer and the deformable layer, and the screening hole passes through the fixed layer and the deformable layer.

[0011] Preferably, the deformable layer is located above the fixed layer, and the deformable layer is in communication with the ventilation component;

[0012] The screening holes are tapered hole structures, and the aperture of the screening holes on the deformation layer is larger than the aperture of the screening holes on the fixed layer.

[0013] Preferably, decomposition blocks are evenly arranged on one side of the surface of the fixing layer located inside the dredging gap, and the ends of the decomposition blocks are tapered and in contact with the inner surface of the deformation layer.

[0014] Preferably, the decomposition block is hollow inside, the hollow area inside the decomposition block is communicated with the inflation cavity, and air guide holes are evenly arranged on the side wall of the decomposition block, and the air guide holes are communicated with the inside of the hollow area inside the decomposition block.

[0015] A biomass-based ethanol fermentation conversion method, wherein the ethanol fermentation conversion method uses the above-mentioned ethanol fermentation conversion reaction equipment, and the specific steps of the ethanol fermentation conversion method are:

[0016] S1, raw material pretreatment: the biomass raw materials are crushed using crushing equipment, and then chemical or biological treatment methods are used to destroy the internal structure of the biomass raw materials;

[0017] S2, hydrolysis and saccharification: hydrolytic enzymes are added to the pretreated biomass raw materials, the temperature is controlled at 45-55°C, the pH is maintained at 4.5-5.5, and the hydrolysis reaction is continued for 24-48 hours to obtain saccharified liquid;

[0018] S3, fermentation in fermentation tank: the saccharified liquid is transferred to the cleaned and disinfected fermentation tank and mixed with the fermentation strain; the ventilation component and temperature control component are adjusted to control the temperature inside the fermentation chamber at 28-35°C and the pH value at 4-5, and the fermentation cycle lasts for 48-72 hours;

[0019] S4, distillation and purification: After fermentation, the ethanol is pumped into a distillation tower through a pipeline for crude distillation to increase the ethanol concentration to 40-60%. It then enters a rectification tower for further separation and purification to remove methanol and fusel oil impurities, ultimately obtaining high-purity ethanol with a concentration of more than 95%.

[0020] The beneficial effects of the present invention are as follows:

[0021] The biomass-based ethanol fermentation conversion reaction equipment and method disclosed herein comprises a screening hopper disposed in the middle of the bottom of a fermentation chamber. When a power device is activated, a stirring shaft and a stirring plate are driven to rotate, and the stirring plate pushes the fermentation raw materials downward and into the screening hopper. Smaller particles and liquids pass smoothly through the screening holes and through the screening hopper, while agglomerated solid raw material particles are confined to the screening hopper.

[0022] The telescopic device is started to push the screening bucket to move vertically upward along the stirring shaft. The slowly rotating stirring plate directly contacts and stirs the solid particle aggregates inside the screening bucket, causing them to be stirred and broken and dispersed, and fully mixed with the inflowing liquid raw material part, passing through the screening hole at the bottom. The above process is repeated many times to avoid the situation where the solid particles aggregate into agglomerates, causing the expansion of the hypoxic area and affecting the smooth progress of fermentation, and to ensure that the solid particles are fully mixed with the fermentation strains in the liquid part during the vertical circulation flow inside the fermentation chamber, thereby improving the fermentation efficiency and thus improving the ethanol conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a perspective view of the ethanol fermentation conversion reaction equipment of the present invention;

[0025] Figure 2 It is a partial cross-sectional view of the ethanol fermentation conversion reaction equipment of the present invention;

[0026] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0027] Figure 4 It is a three-dimensional diagram of the screening bucket in the present invention;

[0028] Figure 5 This is a schematic diagram of the screening bucket after the deformation layer is removed in the present invention;

[0029] Figure 6 It is a flow chart of the biomass-based ethanol fermentation conversion method of the present invention.

[0030] In the figure: fermentation tank 1, fermentation chamber 11, agitator 12, stirring shaft 121, stirring plate 122, screening bucket 13, screening hole 131, inflation chamber 132, inflation tube 133, inflation hole 134, fixed layer 135, deformation layer 136, dredging gap 137, telescopic device 14, guide plate 15, crushing block 151, decomposition block 16, air guide hole 161, ventilation component 2. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings shown in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1:

[0033] As shown in the accompanying drawings Figure 1-Figure 5 As shown, a biomass-based ethanol fermentation conversion reaction equipment includes a fermentation tank 1, and a stirrer 12 is provided in a fermentation chamber 11 inside the fermentation tank 1; the stirrer 12 includes a vertical stirring shaft 121 and a fan-shaped stirring plate 122 provided on the outer surface of the bottom of the stirring shaft 121; the power device of the stirrer 12 is located at the top of the fermentation tank 1, and the power device here can be a driving motor, the output end of which is connected to the stirrer 12, and under the control of an external controller, the stirrer 12 is driven to stir the raw materials inside the fermentation chamber 11; a ventilation component 2 is provided at the bottom of the fermentation tank 1, and the ventilation component 2 is communicated with the interior of the fermentation tank 1, and a temperature control component is provided on the side wall of the fermentation tank 1. Under the control of the processing personnel, the ventilation component 2 and the temperature control component adjust the gas environment and temperature environment inside the fermentation chamber 11 according to the existing fermentation environment requirements to ensure the smooth progress of the fermentation process;

[0034] The stirring shaft 121 of the agitator 12 is located in the middle of the fermentation chamber 11, and the stirring plate 122 is located on the stirring shaft 121. A screening bucket 13 is provided near the bottom of the fermentation chamber 11. The screening bucket 13 is approximately an annular basin structure, and the outer edge of the screening bucket 13 maintains a gap with the inner wall of the fermentation chamber 11. The stirring shaft 121 slides through the middle part of the screening bucket 13, and screening holes 131 are evenly provided at the bottom of the screening bucket 13. The screening bucket 13 is connected to the telescopic device 14 provided at the bottom of the fermentation tank 1. The telescopic device 14 here can be an existing electric telescopic device.

[0035] The specific working process is as follows: a biomass raw material such as straw is pretreated and then hydrolyzed to form a solid-liquid mixed fermentation raw material rich in fermentable sugars, which is then injected into the fermentation tank 1. An appropriate amount of fermentation strain is then added and fully mixed under the action of the stirrer 12. The ventilation component 2 and the temperature control component are used to ensure that the fermentation raw material obtains a suitable fermentation temperature and gas environment in the fermentation tank 1, ensuring smooth fermentation of the raw material and promoting the reaction to convert it into ethanol. The fermentation broth is then discharged after fermentation, and the ethanol component therein is separated and enriched, completing the process of obtaining an ethanol product based on the biomass raw material.

[0036] During this process, because a large amount of solid particles are still mixed in the fermentation raw materials, these solid particles are easily aggregated into agglomerates due to the adhesion of the sugar components in the fermentation raw materials and accumulated at the bottom of the fermentation tank 1, resulting in insufficient contact between them and the fermentation strains and incomplete fermentation. In addition, the accumulated solid particles are easily isolated from oxygen, resulting in insufficient contact between the wrapped part of the raw materials and oxygen, resulting in the formation of anaerobic areas and the massive reproduction of some anaerobic microorganisms, thereby producing odorous substances and even harmful substances, affecting the quality of the fermentation liquid.

[0037] Therefore, the present application provides a screening bucket 13 at the middle position of the bottom of the fermentation chamber 11. The screening bucket 13 is a basin-shaped structure, and screening holes 131 are evenly arranged at the horizontal portion of the bottom. The stirring plate 122 on the stirring shaft 121 is located above the opening of the screening bucket 13. When the power device is started, the stirring shaft 121 and the stirring plate 122 are driven to rotate. Because the stirring plate 122 is a fan-shaped structure, it promotes the downward flow of the fermentation liquid in contact with it.

[0038] Therefore, the stirring plate 122 located on the upper side of the opening of the screening bucket 13 pushes the fermentation raw materials to flow downward and enter the interior of the screening bucket 13. The smaller particles and the liquid part smoothly pass through the screening holes 131 and pass through the screening bucket 13 to enter the bottom of the fermentation chamber 11. Then, they pass upward through the gap area between the vertical part of the screening bucket 13 and the side wall of the fermentation chamber 11 and flow back to the upper side of the screening bucket 13, realizing a circular flow.

[0039] During this process, some of the solid raw material particles that have agglomerated into agglomerates are confined to the inside of the screening bucket 13 due to their large volume. After a period of time, when the solid raw material agglomerates accumulated in the screening bucket 13 hinder the normal flow of the screening hole 131, the telescopic device 14 is started to push the screening bucket 13 to move vertically upward along the stirring shaft 121, and at the same time, the power device is controlled to drive the stirring shaft 121 to rotate slowly. The upward-moving screening bucket 13 approaches the stirring plate 122 until the stirring plate 122 passes through the top opening of the screening bucket 13 and enters the interior. At this time, the slowly rotating stirring plate 122 directly contacts and stirs the solid particle agglomerates in the screening bucket 13. The aggregates are stirred and broken up and dispersed, and are fully mixed with the inflowing liquid raw material part, passing through the screening hole 131 at the bottom, until the solid particle aggregates accumulated inside the screening bucket 13 are fully broken up and passed through the screening hole 131, and the screening bucket 13 is controlled to move down and reset; in this way, during the fermentation process, the above process is repeated many times to avoid the situation where the solid particles aggregate into agglomerates, causing the expansion of the anoxic area and affecting the smooth progress of the fermentation, and the solid particles are fully mixed with the fermentation strains in the liquid part during the vertical circulation flow inside the fermentation chamber 11, thereby improving the fermentation efficiency and thus improving the ethanol conversion efficiency.

[0040] Example 2:

[0041] On the basis of Example 1, guide plates 15 are evenly arranged on the inner wall of the vertical part of the screening bucket 13. The guide plates 15 are distributed in a ring around the stirring shaft 121, and the ends of the guide plates 15 are tilted, and the tilt rotation direction of the ends of the guide plates 15 is the same as the rotation direction of the stirring shaft 121; the end of the guide plate 15 is evenly provided with a crushing block 151 on the surface of the side close to the stirring shaft 121, and the end of the crushing block 151 is a sharp structure.

[0042] Specific workflow: Based on the specific workflow in Example 1, as the screening bucket 13 moves upward and interlocks with the stirring plate 122 on the stirring shaft 121, the slowly rotating stirring plate 122 acts on the solid particle aggregates surrounded by the screening bucket 13. The stirring action causes the solid particle aggregates to collide and break. At the same time, because the rotation of the stirring plate 122 causes the solid-liquid mixture in the screening bucket 13 to rotate along with the stirring plate 122, the rotating fermentation raw materials collide with each other during the rotation process, causing the parts with a tendency to agglomerate to be impacted and broken into smaller pieces;

[0043] During the rotation, the centrifugal force causes the larger solid particles that have clumped together due to adhesion to deflect outward and contact the inner wall of the vertical portion of the screening bucket 13 located on the outside. The guide plates 15 are evenly arranged on the inner wall of the vertical portion. After the flowing fermentation material contacts the guide plates 15, it flows along the inclined surface of the guide plates 15 toward the stirring shaft 121 and collides with the material flowing outward from the center of the stirring shaft 121. The mutual collision process causes the larger solid particles to decompose.

[0044] Crushing blocks 151 are evenly arranged on the inclined surface of the guide plate 15 near the end. Therefore, when the fermentation raw materials contact the guide plate 15 and flow along the inclined surface of the guide plate 15, they contact the ends of the evenly distributed crushing blocks 151. The smaller solid particles and liquid parts pass smoothly through the gaps between the crushing blocks 151, while the larger solid particles are intercepted by the crushing blocks 151 and crushed and decomposed under the impact of the ends of the crushing blocks 151, thereby achieving full decomposition and refinement of the larger solid particles intercepted and restricted inside the screening bucket 13, promoting full contact between the solid particles and the liquid part, further eliminating the oxygen-deficient area, and ensuring the smooth progress of the fermentation process.

[0045] Example 3:

[0046] On the basis of Example 2, the vertical part of the screening bucket 13 is hollow inside to form an inflation chamber 132, and the inflation chamber 132 is connected to the ventilation component 2 through an inflation tube 133. The inflation tube 133 is provided with a one-way valve to prevent the backflow of the liquid part of the fermentation raw material; the ventilation component 2 can directly select the equipment used to adjust the internal gas composition in the existing fermentation equipment, and send the purified air into the inflation chamber 132 through the air pump equipment, and the inner wall of the vertical part of the screening bucket 13 is evenly provided with inflation holes 134, and the outer opening of the inflation hole 134 can be provided with a filter to prevent the entry of solid particles and cause the inflation hole 134 to be blocked. The inflation hole 134 is connected to the inside of the inflation chamber 132, and the inflation hole 134 is distributed in the gap between the guide plates 15.

[0047] Specific working process: Based on the specific working process in Example 2, after the ventilation component 2 is started, part of the air flow is input into the interior of the inflation cavity 132. Then, the air flows out of the gap between adjacent guide plates 15 from the inflation hole 134, so that the solid agglomerates accumulated in the gap area are flushed out. In addition, the flowing air flow flows along the inclined surface of the guide plate 15, driving the adjacent solid agglomerates to move together and contact with the crushing blocks 151 provided on the surface of the guide plate 15, causing the solid agglomerates therein to be broken during the impact process with the crushing blocks 151.

[0048] Furthermore, air exists in the form of bubbles when mixed into the liquid fermentation raw materials. Therefore, when impacting the solid agglomerates and contacting the sharp end of the impact crushing block 151, the larger bubbles are caused to break and release the impact force to cause the solid agglomerates to decompose. The impact of the bubble breakage also causes the solid particles adhering to the gaps in the crushing block 151 to be separated under the impact, participate in the circulation flow inside the fermentation chamber 11, and fully participate in the fermentation reaction.

[0049] Example 4:

[0050] Based on the third embodiment, the bottom of the screening hopper 13 has a double-layer structure, including a fixed layer 135 and a deformable layer 136. The fixed layer 135 is made of a rigid material, and the deformable layer 136 is made of an elastic material, both of which are food-grade materials. A clearance gap 137 is formed between the fixed layer 135 and the deformable layer 136, and the screening hole 131 penetrates the fixed layer 135 and the deformable layer 136.

[0051] The deformation layer 136 is located on the upper side of the fixed layer 135, and the dredging gap 137 is connected to the ventilation component 2. Specifically, the dredging gap 137 can be connected to the inside of the inflation chamber 132 through a hose to enable the injected air to be introduced into the dredging gap 137; the screening hole 131 is a conical hole structure, and the aperture of the screening hole 131 located on the deformation layer 136 is larger than the aperture of the screening hole 131 located on the fixed layer 135.

[0052] Specific workflow: Based on the specific workflow in Example 3, for the position where the screening hole 131 may be blocked, the horizontal part of the bottom of the screening bucket 13 corresponding to the screening hole 131 is set to a double-layer structure, and a dredging gap 137 is formed in the area between the fixed layer 135 and the deformable layer 136. As the telescopic device 14 starts to drive the screening bucket 13 to move back and forth vertically, the flow rate of the fermentation raw material through the dredging gap 137 increases, and impacts the deformable layer 136 therein, causing the deformable layer 136 to deform back and forth. At this time, the space of the dredging gap 137 changes, which intensifies the material exchange between the inside and outside of the dredging gap 137. The material flows from the inside to the outside or from the outside to the inside repeatedly, and reciprocates to impact the screening hole 131 on the fixed layer 135 and the deformable layer 136, taking away the solid particles blocked in the screening hole 131, and ensuring its passability.

[0053] Furthermore, the screening holes 131 on the deformable layer 136 are arranged with a relatively large aperture. When the ventilation assembly 2 is activated and the interior of the dredging gap 137 is inflated, the increased air pressure causes the deformable layer 136 to deform and expand outward, and the aperture of the screening holes 131 on the deformable layer 136 is further increased, causing the solid particles accumulated in the screening hopper 13 to pass through the deformable layer 136 and enter the dredging gap 137. After that, they are intercepted by the fixed layer 135 and confined to the dredging gap 137.

[0054] Then, ventilation is continued, and the gas-liquid mixture forms bubbles that stir the inside of the dredging gap 137. After the inflation stops, the deformation layer 136 recovers and squeezes the middle dredging gap 137 area. The pressure increase causes the bubbles to break and release, and then fully contact the solid particles and liquid parts. At the same time, the impact and pressure squeezing effects cause the solid particle aggregates inside the dredging gap 137 to break and decompose. Then, in the process of the dredging gap 137 being pressurized to release the internal material outward, the part that meets the particle size size passes through the fixed layer 135 smoothly, while the larger part is rushed into the screening bucket 13 or continues to remain in the dredging gap 137, waiting for subsequent inflation processing;

[0055] During this process, the gas-liquid mixture is ejected outward through the screening holes 131, clearing and cleaning the screening holes 131, further ensuring the permeability of the screening holes 131 on the fixed layer 135 and the deformable layer 136; the ventilation component 2 is controlled to inflate the fermentation chamber 11 with concentrated air for 3-5 seconds, then stop, and then inflate again after waiting for 5-8 seconds, and repeat this process multiple times, so that the expansion and contraction of the dredging gap 137 are repeated multiple times, squeezing and impacting the solid particles entering the dredging gap 137 to decompose them, while ensuring the permeability of the screening holes 131 on the upper and lower sides;

[0056] Furthermore, when the deformation layer 136 expands outward, it will occupy the area surrounded by the screening bucket 13 and approach the corresponding stirring plate 122. The stirring plate 122 is controlled to rotate slowly, and when it contacts the outer surface of the deformation layer 136, it rotates and squeezes the surface of the deformation layer 136, causing the gas-liquid mixture inside the dredging gap 137 to be pressurized and accelerated to stir and overflow outward, while impacting the solid agglomerates in the area surrounded by the screening bucket 13, and also causing the solid agglomerates mixed inside the dredging gap 137 to accelerate decomposition and refinement, thereby improving the fermentation degree of the solid raw materials.

[0057] Embodiment 5:

[0058] On the basis of Example 4, the fixed layer 135 is located on one side of the inner surface of the dredging gap 137 and is evenly provided with decomposition blocks 16. The end of the decomposition block 16 is conical and contacts the inner surface of the deformation layer 136. The screening holes 131 are distributed in the gap area between the decomposition blocks 16; the cross-section of the decomposition block 16 is triangular and hollow inside. The hollow area inside the decomposition block 16 is connected to the inflation cavity 132. Specifically, it can be reflected in that the hollow area inside the decomposition block 16 is connected to the inside of the inflation cavity 132 through a hose, and air guide holes 161 are evenly provided on the side wall of the decomposition block 16, and the air guide holes 161 are connected to the inside of the hollow area inside the decomposition block 16.

[0059] Specific workflow: Based on the specific workflow of Example 4, under normal circumstances, the tapered end of the decomposition block 16 on the fixed layer 135 contacts the inner surface of the deformable layer 136 and presses against the deformable layer 136 under the action of external force, ensuring the internal dredging gap 137 area;

[0060] During the process of the ventilation component 2 inflating the interior of the dredging gap 137, air first enters the hollow area inside the decomposition block 16 and flows along the hollow area, and is replenished into the dredging gap 137 from the air guide holes 161 on both sides of the hollow area; the guiding effect of the hollow area inside the decomposition block 16 causes the replenished inflowing air to be more evenly dispersed into the dredging gap 137, and impact the fermentation raw materials located in the area between adjacent decomposition blocks 16; the increase in pressure in the dredging gap 137 causes the deformation layer 136 to deform and expand outward, the area of the dredging gap 137 increases, and the gap between the inner surface of the deformation layer 136 and the end of the decomposition block 16 increases. As the inflation stops, the deformed and recovered deformation layer 136 drives the solid particles still remaining in the dredging gap 137 to contact the conical end of the decomposition block 16. The impact and extrusion of the end of the decomposition block 16 causes the large-volume solid particles remaining in the dredging gap 137 to be decomposed and refined, and then flow out from the screening hole 131. This is repeated to ensure the passability of the screening hole 131.

[0061] Example 6:

[0062] Based on the above embodiment, as shown in the accompanying drawings Figure 6 As shown, a biomass-based ethanol fermentation conversion method uses the above-mentioned ethanol fermentation conversion reaction equipment. The specific steps of the ethanol fermentation conversion method are:

[0063] S1, raw material pretreatment: the biomass raw materials are crushed using crushing equipment, and then chemical or biological treatment methods are used to destroy the internal structure of the biomass raw materials;

[0064] S2, hydrolysis and saccharification: hydrolytic enzymes are added to the pretreated biomass raw materials, the temperature is controlled at 45-55°C, the pH is maintained at 4.5-5.5, and the hydrolysis reaction is continued for 24-48 hours to obtain saccharified liquid;

[0065] S3, fermentation in fermenter: the saccharified liquid is transferred to the cleaned and disinfected fermenter 1 and mixed with the fermentation strain; the temperature inside the fermentation chamber 11 is controlled at 28-35°C and the pH value is controlled at 4-5 by adjusting the ventilation component 2 and the temperature control component. The fermentation cycle lasts for 48-72 hours;

[0066] S4, distillation and purification: After fermentation, the ethanol is pumped into a distillation tower through a pipeline for crude distillation to increase the ethanol concentration to 40-60%. It then enters a rectification tower for further separation and purification to remove methanol and fusel oil impurities, ultimately obtaining high-purity ethanol with a concentration of more than 95%.

[0067] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A biomass-based ethanol fermentation conversion reaction device, comprising a fermentation tank (1), a fermentation chamber (11) inside the fermentation tank (1) is provided with an agitator (12), a power device of the agitator (12) is located at the top of the fermentation tank (1), a ventilation component (2) is provided at the bottom of the fermentation tank (1), the ventilation component (2) is communicated with the interior of the fermentation tank (1), and a temperature control component is provided on the side wall of the fermentation tank (1); Its characteristics are: The stirring shaft (121) of the stirrer (12) is located in the middle of the fermentation chamber (11), and the stirring plate (122) is located on the stirring shaft (121). A screening bucket (13) is provided near the bottom of the fermentation chamber (11). The stirring shaft (121) slides through the middle of the screening bucket (13), and screening holes (131) are evenly provided at the bottom of the screening bucket (13). The screening bucket (13) is connected to the output end of the telescopic device (14) provided at the bottom of the fermentation tank (1). The bottom of the screening bucket (13) is a double-layer structure, including a fixed layer (135) and a deformable layer (136), the fixed layer (135) is made of a rigid material, the deformable layer (136) is made of an elastic material, and a dredging gap (137) is formed in the area between the fixed layer (135) and the deformable layer (136), and the screening hole (131) penetrates the fixed layer (135) and the deformable layer (136); The deformable layer (136) is located above the fixed layer (135), and the dredging gap (137) is in communication with the ventilation component (2); the screening hole (131) is a tapered hole structure, and the aperture of the screening hole (131) located on the deformable layer (136) is larger than the aperture of the screening hole (131) located on the fixed layer (135).

2. The biomass-based ethanol fermentation conversion reaction equipment according to claim 1, characterized in that: Guide plates (15) are evenly arranged on the inner wall of the vertical portion of the screening bucket (13). The guide plates (15) are distributed in a ring shape around the stirring shaft (121), and the ends of the guide plates (15) are all inclined along the same rotation direction.

3. The biomass-based ethanol fermentation conversion reaction equipment according to claim 2, characterized in that: Crushing blocks (151) are evenly arranged on the surface of one side of the end of the guide plate (15) close to the stirring shaft (121), and the end of the crushing block (151) is a sharp structure.

4. The biomass-based ethanol fermentation conversion reaction equipment according to claim 3, characterized in that: The vertical portion of the screening hopper (13) is hollow inside to form an inflation cavity (132), which is communicated with the ventilation assembly (2) through an inflation pipe (133), and inflation holes (134) are evenly arranged on the inner wall of the vertical portion of the screening hopper (13), which are communicated with the interior of the inflation cavity (132), and the inflation holes (134) are distributed in the gaps between the guide plates (15).

5. The biomass-based ethanol fermentation conversion reaction equipment according to claim 1, characterized in that: The fixed layer (135) is located inside the dredging gap (137) and has decomposition blocks (16) evenly arranged on one side of its surface. The end of the decomposition block (16) is tapered and contacts the inner surface of the deformation layer (136).

6. The biomass-based ethanol fermentation conversion reaction equipment according to claim 5, characterized in that: The decomposition block (16) is hollow inside, and the hollow area inside the decomposition block (16) is communicated with the inflation cavity (132). Air guide holes (161) are evenly arranged on the side wall of the decomposition block (16), and the air guide holes (161) are communicated with the inside of the hollow area inside the decomposition block (16).

7. A biomass-based ethanol fermentation conversion method, characterized in that: The ethanol fermentation conversion method uses the ethanol fermentation conversion reaction equipment according to any one of claims 1 to 6. The specific steps of the ethanol fermentation conversion method are: S1, raw material pretreatment: the biomass raw materials are crushed using crushing equipment, and then chemical or biological treatment methods are used to destroy the internal structure of the biomass raw materials; S2, hydrolysis and saccharification: hydrolytic enzymes are added to the pretreated biomass raw materials, the temperature is controlled at 45-55°C, the pH is maintained at 4.5-5.5, and the hydrolysis reaction is continued for 24-48 hours to obtain saccharified liquid; S3, fermentation in a fermentation tank: the saccharified liquid is transferred to a cleaned and disinfected fermentation tank (1), and the fermentation strain is mixed in at the same time; by adjusting the ventilation component (2) and the temperature control component, the temperature inside the fermentation chamber (11) is controlled at 28-35°C and the pH value is controlled at 4-5, and the fermentation cycle lasts for 48-72 hours; S4, distillation and purification: After fermentation, the ethanol is pumped into a distillation tower through a pipeline for crude distillation to increase the ethanol concentration to 40-60%. It then enters a rectification tower for further separation and purification to remove methanol and fusel oil impurities, ultimately obtaining high-purity ethanol with a concentration of more than 95%.

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