Biomass-based ethanol fermentation conversion reaction equipment and method

Abstract

The invention belongs to the technical field of ethanol fermentation, and particularly relates to biomass-based ethanol fermentation conversion reaction equipment and method.The biomass-based ethanol fermentation conversion reaction equipment comprises a fermentation tank, a stirrer is arranged in a fermentation cavity in the fermentation tank, power equipment of the stirrer is located at the top of the fermentation tank, and a ventilation assembly is arranged at the bottom of the fermentation tank; the ventilation assembly is communicated with the inside of the fermentation tank; a temperature control assembly is arranged on the side wall of the fermentation tank; the screening hopper is arranged in the middle of the bottom of the fermentation cavity, solid raw material particles which are gathered into clusters in fermentation raw materials are partially limited into the screening hopper and then stirred through the stirring plate rotating at a low speed, so that the solid raw material particles are crushed and dispersed and are fully mixed with flowing-in liquid raw materials, and the fermentation efficiency is improved. The condition that the anaerobic area is enlarged to influence the smooth fermentation due to aggregation of solid particles is avoided, the quality of fermentation liquor is ensured, and the ethanol conversion efficiency is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ethanol fermentation, and specifically relates to an ethanol fermentation conversion reaction device and method based on biomass. Background Art

[0002] When using non-food lignocellulosic biomass, such as straw, wood, etc., as raw materials to produce second-generation biomass-based liquid fuels, in the preparation process, it is mainly based on the ethanol fermentation conversion technology of lignocellulosic biomass to convert biomass raw materials into ethanol.

[0003] During the actual operation process, the processing personnel found that there are still a large number of solid particles mixed in the pretreated fermentation raw materials. These solid particles in the fermentation raw materials are prone to agglomerate and accumulate at the bottom of the fermentation tank due to the adhesion of the contained sugar components. These agglomerated raw materials do not come into sufficient contact with the fermentation strains, resulting in incomplete fermentation. Moreover, the aggregated and accumulated solid particles are prone to isolate oxygen, causing the raw materials in the enclosed part to have insufficient contact with oxygen, resulting in the emergence of anaerobic areas and the massive reproduction of some anaerobic microorganisms, thereby generating odoriferous substances or even harmful substances, which affect the quality of the fermentation broth. Summary of the Invention

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

[0005] The technical solution adopted by the present invention to solve its technical problems is: The present invention proposes an ethanol fermentation conversion reaction device based on biomass, including a fermentation tank. A stirrer is arranged in the fermentation chamber inside the fermentation tank. The power equipment of the stirrer is located at the top position of the fermentation tank. An air supply assembly is arranged at the bottom of the fermentation tank, and the air supply assembly is communicated with the inside of the fermentation tank. A temperature control assembly is arranged on the side wall of the fermentation tank; The stirring shaft of the stirrer is located in the middle of the fermentation chamber, and the stirring plates are located on the stirring shaft. A screening hopper is arranged at a position close to the bottom inside the fermentation chamber. The stirring shaft slidably penetrates through the middle part of the screening hopper, and screening holes are evenly arranged at the bottom of the screening hopper. The screening hopper is connected to the output end of a telescopic device arranged at the bottom of the fermentation tank.

[0006] Preferably, guide plates are evenly arranged on the inner wall of the vertical part of the screening hopper. 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.

[0007] Preferably, crushing blocks are evenly arranged on the surface of the end of the guide plate close to the stirring shaft side, and the ends of the crushing blocks are in a sharp structure.

[0008] Preferably, the interior of the vertical part of the screening hopper is hollow to form an inflation cavity, the inflation cavity communicates with the ventilation assembly through an inflation pipe, and the inner wall of the vertical part of the screening hopper is evenly provided with inflation holes, the inflation holes communicate with the inside of the inflation cavity, and the inflation holes are distributed in the gaps between the guide plates.

[0009] Preferably, the bottom of the screening hopper is a double-layer structure, including a fixed layer and a deformation layer, the fixed layer is made of a rigid material, the deformation layer is made of an elastic material, and a dredging gap is formed in the area between the fixed layer and the deformation layer, and the screening holes penetrate through the fixed layer and the deformation layer.

[0010] Preferably, the deformation layer is located above the fixed layer, and the deformation layer communicates with the ventilation assembly; The screening holes are of a conical hole structure, and the aperture of the screening holes located on the deformation layer is larger than the aperture of the screening holes located on the fixed layer.

[0011] Preferably, decomposition blocks are evenly arranged on one side surface inside the dredging gap of the fixed layer, and the end of the decomposition block is conical and contacts the inner surface of the deformation layer.

[0012] Preferably, the inside of the decomposition block is hollow, the hollow area inside the decomposition block communicates with the inflation cavity, and air guide holes are evenly arranged on the side wall of the decomposition block, and the air guide holes communicate with the inside of the hollow area inside the decomposition block.

[0013] A method for ethanol fermentation conversion based on biomass, 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 as follows: S1, raw material pretreatment: The biomass raw material is crushed by a crushing device, and then the internal structure of the biomass raw material is destroyed by chemical or biological treatment methods; S2, hydrolysis and saccharification: Hydrolytic enzyme is added to the pretreated biomass raw material, the temperature is controlled at 45-55 °C, the pH is maintained at 4.5-5.5, and the hydrolysis reaction lasts for 24-48 hours to obtain a saccharified solution; S3, fermentation in the fermentation tank: The saccharified solution is transferred to a cleaned and disinfected fermentation tank, and at the same time, fermentation strains are mixed in; by adjusting the ventilation assembly and the temperature control assembly, the internal temperature of the fermentation cavity is controlled at 28-35 °C and the pH value is at 4-5, and the fermentation cycle lasts for 48-72 hours; S4, distillation and purification: After fermentation, it is pumped into a distillation tower through a pipeline for rough distillation to increase the ethanol concentration to 40-60%; then it enters a rectification tower for further separation and purification to remove impurities such as methanol and fusel oil, and finally obtain high-purity ethanol with a concentration of more than 95%.

[0014] The beneficial effects of the present invention are as follows: In the ethanol fermentation conversion reaction equipment and method based on biomass according to the present invention, a screening hopper is arranged at the middle position of the bottom of the fermentation chamber. When the power equipment is started, the stirring shaft and the stirring plate are driven to rotate. The stirring plate pushes the fermentation raw materials to flow downward and enter the interior of the screening hopper. Among them, the smaller particle part and the liquid part smoothly pass through the screening holes and pass through the screening hopper, and the solid raw material particle part aggregated into groups is restricted to the interior of the screening hopper; The telescopic equipment is started to push the screening hopper to move vertically upward along the stirring shaft. The solid particle aggregates located inside the screening hopper are directly contacted and agitated by the slowly rotating stirring plate, so that they are agitated and broken up, and are fully mixed with the inflowing liquid raw material part, and pass through the screening holes at the bottom. The above process is repeated many times to avoid the situation that the aggregation of solid particles leads to the expansion of the oxygen-deficient area and affects the smooth progress of fermentation, and enables the solid particles to be fully mixed with the fermentation strains in the liquid part during the vertical circulation flow in the fermentation chamber, improving the fermentation efficiency and thus the ethanol conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 is a perspective view of the ethanol fermentation conversion reaction equipment in the present invention; Figure 2 is a partial cross-sectional view of the ethanol fermentation conversion reaction equipment in the present invention; Figure 3 is Figure 2 a partial enlarged view of part A in Figure 4 is a perspective view of the screening hopper in the present invention; Figure 5 is a schematic diagram of the screening hopper in the present invention after removing the deformation layer; Figure 6 is a flow chart of the ethanol fermentation conversion method based on biomass in the present invention.

[0017] In the figure: fermentation tank 1, fermentation chamber 11, stirrer 12, stirring shaft 121, stirring plate 122, screening hopper 13, screening holes 131, inflation chamber 132, inflation pipe 133, inflation holes 134, fixed layer 135, deformation layer 136, dredging gap 137, telescopic equipment 14, guide plate 15, crushing block 151, decomposition block 16, air guide holes 161, ventilation assembly 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1:

[0020] As shown in the accompanying drawings of the specification Figures 1-5 A biomass-based ethanol fermentation conversion reaction device includes a fermentation tank 1, and a stirrer 12 is arranged in the fermentation chamber 11 inside the fermentation tank 1; the stirrer 12 includes a vertical stirring shaft 121 and a fan-shaped stirring plate 122 arranged 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. Here, the power device can be a driving motor, and the output end is connected to the stirrer 12, which drives the stirrer 12 to stir the raw materials inside the fermentation chamber 11 under the control of an external controller; an air supply assembly 2 is arranged at the bottom of the fermentation tank 1, and the air supply assembly 2 is communicated with the inside of the fermentation tank 1. A temperature control assembly is arranged on the side wall of the fermentation tank 1. The air supply assembly 2 and the temperature control assembly are adjusted under the control of the processing personnel according to the existing fermentation environment requirements to adjust the gas environment and temperature environment inside the fermentation chamber 11 to ensure the smooth progress of the fermentation process. 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 hopper 13 is arranged at the part near the bottom inside the fermentation chamber 11. The screening hopper 13 is approximately in the shape of an annular basin, and there is a gap between the outer edge of the screening hopper 13 and the inner wall of the fermentation chamber 11. The stirring shaft 121 slides through the middle part of the screening hopper 13, and screening holes 131 are evenly arranged at the bottom of the screening hopper 13. The screening hopper 13 is connected to a telescopic device 14 arranged at the bottom of the fermentation tank 1. Here, the telescopic device 14 can be an existing electric telescopic device.

[0021] Specific working process: Pretreat biomass raw materials such as straw and then hydrolyze them to promote the formation of a solid-liquid mixed fermentation raw material rich in fermentable sugars, and inject it into the fermentation tank 1. Then, supplement an appropriate amount of fermentation strains and make them fully mixed under the action of the stirrer 12. Cooperate with the air supply assembly 2 and the temperature control assembly to enable the fermentation raw materials to obtain a suitable fermentation temperature environment and gas environment in the fermentation tank 1 to ensure the smooth fermentation of the raw materials and promote the reaction to be converted into ethanol; then export the fermented liquid after fermentation and separate and enrich the ethanol component in it to complete the process of obtaining ethanol products based on biomass raw materials. During this process, since a large amount of solid particles are still mixed in the fermentation raw materials, these solid particles are prone to aggregate into clusters under the adhesion of the sugar components in the fermentation raw materials and accumulate at the bottom of the fermentation tank 1, resulting in insufficient contact with the fermentation strains and incomplete fermentation. Moreover, the aggregated and accumulated solid particles are likely to isolate oxygen, causing insufficient contact between the raw materials in the wrapped part and oxygen, resulting in the emergence of anaerobic areas and the large reproduction of some anaerobic microorganisms, thereby generating odoriferous substances or even harmful substances and affecting the quality of the fermentation broth. Therefore, in the present application, a screening hopper 13 is provided at the middle position of the bottom of the fermentation chamber 11. The screening hopper 13 is of a basin-like structure, and screening holes 131 are evenly arranged in the horizontal part of the bottom. The stirring plate 122 on the stirring shaft 121 is located above the opening of the screening hopper 13. When the power device is started, the stirring shaft 121 and the stirring plate 122 are driven to rotate. Since the stirring plate 122 is of a fan blade structure and promotes the fermentation broth in contact to have a downward flow trend. Therefore, the stirring plate 122 located above the opening of the screening hopper 13 pushes the fermentation raw materials to flow downward and enter the interior of the screening hopper 13. After the smaller particle part and the liquid part smoothly pass through the screening holes 131 and pass through the screening hopper 13 and enter the bottom of the fermentation chamber 11, they then pass upward through the gap area between the vertical part of the screening hopper 13 and the side wall of the fermentation chamber 11 and flow back to the upper side of the screening hopper 13 to achieve circular flow. During this process, the part of the solid raw material particles aggregated into clusters is restricted inside the screening hopper 13 due to their large volume. After a period of time, when the accumulated solid raw material agglomerates in the screening hopper 13 hinder the normal flow of the screening holes 131, the telescopic device 14 is started to push the screening hopper 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 hopper 13 approaches the stirring plate 122 until the stirring plate 122 passes through the top opening of the screening hopper 13 and enters the interior. At this time, the slowly rotating stirring plate 122 directly contacts and stirs the solid particle aggregates located inside the screening hopper 13, causing them to be stirred and broken up and fully mixed with the inflowing liquid raw material part, and passing through the screening holes 131 at the bottom. Until the solid particle aggregates accumulated inside the screening hopper 13 are fully broken and refined and pass through the screening holes 131, the screening hopper 13 is controlled to move downward and reset. In this way, during the fermentation process, the above process is repeated multiple times to avoid the situation where the aggregation of solid particles leads to the expansion of the oxygen-deficient area and affects the smooth progress of fermentation, and to make the solid particulate matter fully mixed with the fermentation strains in the liquid part during the vertical circular flow in the fermentation chamber 11, improving the fermentation efficiency and thus the ethanol conversion efficiency.

[0022] Example Two:

[0023] On the basis of Embodiment 1, guide plates 15 are evenly arranged on the inner wall of the vertical part of the screening hopper 13. The guide plates 15 are annularly distributed around the stirring shaft 121, and the ends of the guide plates 15 are inclined. Moreover, the inclination rotation direction of the ends of the guide plates 15 is the same as the rotation direction of the stirring shaft 121. Sharp-structured crushing blocks 151 are evenly arranged on the surface of the ends of the guide plates 15 close to the stirring shaft 121.

[0024] Specific working process: On the basis of the specific working process in Embodiment 1, as the screening hopper 13 moves upward and is embedded with the stirring plates 122 on the stirring shaft 121, the slowly rotating stirring plates 122 act on the solid particle aggregates surrounded inside the screening hopper 13. While the stirring action causes the solid particle aggregates to collide and break with each other, due to the rotation of the stirring plates 122, the solid-liquid mixture inside the screening hopper 13 rotates with the stirring plates 122. The rotating fermented raw materials collide with each other during the rotation process, causing some of the parts with a tendency to agglomerate into clusters to be impacted and broken and refined. Moreover, during the rotation process, due to the centrifugal force, the solid particles with a relatively large volume that are agglomerated due to adhesion deflect outward and contact the inner wall of the vertical part of the outer screening hopper 13. Guide plates 15 are evenly arranged on the inner wall of the vertical part. After the flowing fermented raw materials contact the guide plates 15, they flow along the inclined surfaces of the guide plates 15 towards the direction of the stirring shaft 121 and collide with the raw materials flowing outward from the center of the stirring shaft 121. During the mutual impact process, the solid particles with a relatively large volume are decomposed. Crushing blocks 151 are evenly arranged on the parts of the inclined surfaces of the guide plates 15 close to the ends. Therefore, when the fermented raw materials contact the guide plates 15 and flow along the inclined surfaces of the guide plates 15, they contact the ends of the evenly distributed crushing blocks 151. The smaller solid particles and the liquid part smoothly pass through the gaps between the crushing blocks 151, while the larger solid particles are intercepted by the crushing blocks 151 and broken and decomposed under the impact of the ends of the crushing blocks 151, achieving the full decomposition and refinement of the larger solid particles intercepted and restricted inside the screening hopper 13, promoting the full contact between the solid particles and the liquid part, further eliminating the anoxic areas, and ensuring the smooth progress of the fermentation process.

[0025] Embodiment 3:

[0026] On the basis of Embodiment 2, the vertical part of the screening hopper 13 is hollow to form an inflation cavity 132. The inflation cavity 132 communicates with the ventilation assembly 2 through an inflation pipe 133. A one-way valve is provided on the inflation pipe 133 to prevent the backflow of the liquid part of the fermentation raw material. The ventilation assembly 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 cavity 132 through a gas pump device. Moreover, inflation holes 134 are evenly arranged on the inner wall of the vertical part of the screening hopper 13. A filter screen can be arranged at the outer opening of the inflation holes 134 to prevent the entry of solid particles from blocking the inflation holes 134. The inflation holes 134 communicate with the inside of the inflation cavity 132, and the inflation holes 134 are distributed in the gaps between the flow guide plates 15.

[0027] Specific working process: On the basis of the specific working process in Embodiment 2, after the ventilation assembly 2 is started, part of the air flow is input into the inflation cavity 132. Subsequently, the gas flows out from the inflation holes 134 into the gaps between the adjacent flow guide plates 15, so that the solid aggregates accumulated in the gap area are washed out. And the flowing air flow flows along the inclined surface of the flow guide plate 15, driving the nearby solid aggregates to move together and contact the crushing blocks 151 arranged on the surface of the flow guide plate 15, prompting the solid aggregates among them to break during the impact with the crushing blocks 151. Furthermore, the air is mixed into the liquid fermentation raw material and exists in the form of bubbles. Therefore, when impacting the solid aggregates and contacting and hitting the sharp ends of the crushing blocks 151, it prompts the larger bubbles to break and release impact force to decompose the solid aggregates. The impact of the bubble breakage also separates the solid particles adhered to the gap part of the crushing blocks 151 under the impact, participates in the circulating flow inside the fermentation cavity 11, and fully participates in the fermentation reaction.

[0028] Embodiment 4:

[0029] On the basis of Embodiment 3, the bottom of the screening hopper 13 is a double-layer structure, including a fixed layer 135 and a deformation layer 136. The fixed layer 135 is made of a rigid material, and the deformation layer 136 is made of an elastic material, both of which are food-grade materials. A dredging gap 137 is formed in the area between the fixed layer 135 and the deformation layer 136, and the screening holes 131 penetrate through the fixed layer 135 and the deformation layer 136. The deformation layer 136 is located above the fixed layer 135, and the dredging gap 137 communicates with the ventilation assembly 2. Specifically, the dredging gap 137 can communicate with the inside of the inflation cavity 132 through a hose to realize the introduction of the inflated air into the dredging gap 137. The screening holes 131 are of a conical hole structure, and the aperture of the screening holes 131 on the deformation layer 136 is larger than the aperture of the screening holes 131 on the fixed layer 135.

[0030] Specific working process: Based on the specific working process in Embodiment 3, for the positions where the screening holes 131 may be blocked, the horizontal part at the bottom of the screening hopper 13 corresponding to the screening holes 131 is set as a double-layer structure, and a dredging gap 137 is formed in the area between the fixed layer 135 and the deformation layer 136. As the telescopic device 14 is activated to drive the screening hopper 13 to move vertically back and forth, the flow rate of the fermentation raw materials passing through the dredging gap 137 increases, and the deformation layer 136 therein is impacted, causing the deformation layer 136 to deform back and forth. At this time, the space of the dredging gap 137 changes, which promotes the intensification of the material exchange between the inside and outside of the dredging gap 137. The material flow from the inside to the outside or from the outside to the inside is repeated, reciprocally impacting the screening holes 131 on the fixed layer 135 and the deformation layer 136, carrying away the blocked solid particles in the screening holes 131, and ensuring its passability; And the aperture of the screening holes 131 on the deformation layer 136 is set to be larger. When the ventilation component 2 is activated and the inside of the dredging gap 137 is inflated, the increased air pressure causes the deformation layer 136 to deform and expand outwards, and the aperture of the screening holes 131 on the deformation layer 136 further increases. After the solid particle aggregates accumulated inside the screening hopper 13 pass through the deformation layer 136 and enter the dredging gap 137, they are intercepted by the fixed layer 135 and restricted to the dredging gap 137; Subsequently, continuous ventilation is carried out. The gas-liquid mixture forms bubbles to stir the inside of the dredging gap 137. After the inflation stops, the deformation layer 136 deforms and recovers, squeezing the middle dredging gap 137 area. The increased pressure causes the bubbles to break and release, while fully contacting the solid particles and the liquid part. The impact and pressure extrusion effects cause the solid particle aggregates inside the dredging gap 137 to break and decompose. Subsequently, during the process of the dredging gap 137 being pressed to release the internal materials outwards, the part that meets the particle size smoothly passes through the fixed layer 135, while the part with a larger volume is flushed into the screening hopper 13 or continues to stay in the dredging gap 137, waiting for subsequent inflation treatment; During this process, the gas-liquid mixture jets outwards through the screening holes 131, dredging and cleaning the screening holes 131, and further ensuring the passability of the screening holes 131 on the fixed layer 135 and the deformation layer 136; control the ventilation component 2, during the process of inflating the inside of the fermentation chamber 11, stop after concentrating the inflation for 3 - 5 s, wait for 5 - 8 s and then inflate again, and repeat this process multiple times, so that the expansion and contraction of the dredging gap 137 alternate repeatedly for multiple times. While squeezing, impacting and decomposing the solid particles entering the inside of the dredging gap 137, ensure the passability of the screening holes 131 on the upper and lower sides; Furthermore, when the deformation layer 136 expands outward, it will occupy the area surrounded by the screening hopper 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, prompting the gas-liquid mixture inside the dredging gap 137 to be pressured and accelerated to stir and overflow outward. While impacting the solid agglomerates in the area surrounded by the screening hopper 13, it also prompts the solid agglomerates mixed inside the dredging gap 137 to be accelerated in decomposition and refinement, thereby improving the fermentation degree of the solid raw materials.

[0031] Example Five:

[0032] On the basis of Example Four, decomposition blocks 16 are uniformly arranged on the surface of the fixed layer 135 on one side inside the dredging gap 137. 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 communicates with the inflation cavity 132. Specifically, it can be embodied that the hollow area inside the decomposition block 16 communicates with the inside of the inflation cavity 132 through a hose, and air guide holes 161 are uniformly arranged on the side wall of the decomposition block 16, and the air guide holes 161 communicate with the hollow area inside the decomposition block 16.

[0033] Specific working process: On the basis of the specific working process in Example Four, under normal circumstances, the conical end of the decomposition block 16 on the fixed layer 135 contacts the inner surface of the deformation layer 136 and resists the deformation layer 136 under the action of an external force to ensure the area of the internal dredging gap 137; During the process of the ventilation component 2 inflating the inside of the dredging gap 137, air first enters the hollow area inside the decomposition block 16 and flows along the hollow area, and is supplemented into the dredging gap 137 through the air guide holes 161 on both sides of the hollow area; the guiding effect of the hollow area inside the decomposition block 16 prompts the supplemented inflowing air to be more evenly dispersed into the dredging gap 137 and impact the fermented raw materials in the area between adjacent decomposition blocks 16; the increased 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 restored 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 at the end of the decomposition block 16 prompt the large-volume solid particles remaining in the dredging gap 137 to be decomposed and refined, and then flow out from the screening holes 131. Repeating like this ensures the passability of the screening holes 131.

[0034] Example Six:

[0035] On the basis of the above embodiments, as shown in the accompanying drawings of the specification Figure 6As shown, a biomass-based ethanol fermentation conversion method uses the above ethanol fermentation conversion reaction equipment. The specific steps of the ethanol fermentation conversion method are as follows: S1, Raw material pretreatment: Crush the biomass raw material using a crushing device, and then use chemical or biological treatment methods to destroy the internal structure of the biomass raw material; S2, Hydrolysis and saccharification: Add hydrolytic enzymes to the pretreated biomass raw material, control the temperature at 45 - 55 °C, maintain the pH at 4.5 - 5.5, and continue the hydrolysis reaction for 24 - 48 hours to obtain a saccharified solution; S3, Fermentation in the fermenter: Transfer the saccharified solution to the cleaned and disinfected fermenter 1, and at the same time mix in fermentation strains; By adjusting the ventilation component 2 and the temperature control component, the internal temperature of the fermentation chamber 11 is controlled at 28 - 35 °C and the pH value is at 4 - 5, and the fermentation cycle lasts for 48 - 72 hours; S4, Distillation and purification: After fermentation, pump it into the distillation tower through a pipeline for rough distillation to increase the ethanol concentration to 40 - 60%; Then enter the rectification tower for further separation and purification to remove impurities such as methanol and fusel oil, and finally obtain high-purity ethanol with a concentration of over 95%.

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of 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 stirrer (12) is arranged in a fermentation chamber (11) inside the fermentation tank (1). The power equipment of the stirrer (12) is located at the top position of the fermentation tank (1). An air ventilation component (2) is arranged at the bottom of the fermentation tank (1), and the air ventilation component (2) communicates with the inside of the fermentation tank (1). A temperature control component is arranged on the side wall of the fermentation tank (1). It is characterized in that: The stirring shaft (121) of the stirrer (12) is located in the middle position of the fermentation chamber (11), and stirring plates (122) are located on the stirring shaft (121). A screening hopper (13) is arranged at a position near the bottom inside the fermentation chamber (11). The stirring shaft (121) slidably penetrates through the middle part of the screening hopper (13), and screening holes (131) are uniformly arranged at the bottom of the screening hopper (13). The screening hopper (13) is connected to the output end of a telescopic device (14) arranged at the bottom of the fermentation tank (1).

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

3. The ethanol fermentation conversion reaction device based on biomass according to claim 2, characterized in that: Crushing blocks (151) are uniformly arranged on the surface of the end of the guide plate (15) near the stirring shaft (121). The ends of the crushing blocks (151) are sharp structures.

4. The ethanol fermentation conversion reaction device based on biomass according to claim 3, characterized in that: The inside of the vertical part of the screening hopper (13) is hollow to form an air inflation chamber (132). The air inflation chamber (132) communicates with the air ventilation component (2) through an air inflation pipe (133). Air inflation holes (134) are uniformly arranged on the inner wall of the vertical part of the screening hopper (13), and the air inflation holes (134) communicate with the inside of the air inflation chamber (132). The air inflation holes (134) are distributed in the gaps between the guide plates (15).

5. The ethanol fermentation conversion reaction device based on biomass according to claim 4, characterized in that: The bottom of the screening hopper (13) is a double-layer structure, including a fixed layer (135) and a deformation layer (136). The fixed layer (135) is made of a rigid material, and the deformation layer (136) is made of an elastic material. A dredging gap (137) is formed in the area between the fixed layer (135) and the deformation layer (136). The screening holes (131) penetrate through the fixed layer (135) and the deformation layer (136).

6. The ethanol fermentation conversion reaction device based on biomass according to claim 5, characterized in that: The deformation layer (136) is located at the upper side position of the fixed layer (135), and the dredging gap (137) communicates with the air ventilation component (2); The screening holes (131) are conical hole structures, and the aperture of the screening holes (131) located on the deformation layer (136) is larger than the aperture of the screening holes (131) located on the fixed layer (135).

7. A biomass-based ethanol fermentation conversion reaction device according to claim 6, characterized in that: Decomposing blocks (16) are uniformly arranged on the surface of one side inside the dredging gap (137) of the fixed layer (135). The ends of the decomposing blocks (16) are conical and contact the inner surface of the deformation layer (136).

8. A biomass-based ethanol fermentation conversion reaction device according to claim 7, characterized in that: The inside of the decomposing block (16) is hollow. The hollow area inside the decomposing block (16) communicates with the air inflation chamber (132). Air guide holes (161) are uniformly arranged on the side wall of the decomposing block (16), and the air guide holes (161) communicate with the hollow area inside the decomposing block (16).

9. A biomass-based ethanol fermentation conversion method, characterized in that, The ethanol fermentation conversion method uses the ethanol fermentation conversion reaction device described in any one of the above claims 1-8. The specific steps of the ethanol fermentation conversion method are as follows: S1, Raw material pretreatment: Crush the biomass raw material using a crushing device, and then use chemical or biological treatment methods to destroy the internal structure of the biomass raw material; S2, Hydrolysis and saccharification: Add hydrolytic enzymes to the pretreated biomass raw material, control the temperature at 45 - 55 °C, maintain the pH at 4.5 - 5.5, and carry out the hydrolysis reaction for 24 - 48 hours to obtain a saccharified solution; S3, Fermentation in the fermenter: Transfer the saccharified solution to the cleaned and disinfected fermenter (1), and at the same time mix in the fermentation strain; By adjusting the ventilation component (2) and the temperature control component, make the internal control temperature in the fermentation chamber (11) at 28 - 35 °C and the pH value at 4 - 5, and the fermentation cycle lasts for 48 - 72 hours; S4, Distillation and purification: After fermentation, pump it into the distillation column through a pipeline for rough distillation to increase the ethanol concentration to 40 - 60%; Then enter the rectification column for further separation and purification to remove impurities such as methanol and fusel oil, and finally obtain high-purity ethanol with a concentration of more than 95%.

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