A straw-based alcohol production recycling system

Abstract

This invention discloses a straw-based alcohol production recycling system, comprising a hydrolysis system and a fermentation distillation system connected in sequence. The hydrolysis system includes a physical hydrolysis system, a biological hydrolysis system, and a chemical hydrolysis system connected in sequence. The biological hydrolysis system includes at least two interconnected biological hydrolysis tanks, and the chemical hydrolysis system includes at least two interconnected chemical hydrolysis tanks. This invention solves the problems of high enzyme loss during biological straw treatment, difficulty in balancing efficiency and time during chemical treatment, and poor equipment and raw material versatility, and has good application prospects.

Description

Technical Field

[0001] This utility model relates to the field of straw-based alcohol production technology, specifically to a straw-based alcohol production recycling system. Background Technology

[0002] Straw is mainly composed of cellulose, hemicellulose, and lignin, which are components of the cell wall. Hemicellulose and lignin surround cellulose, forming numerous tightly packed, fine fiber bundles arranged regularly, thus constituting the framework of the cell wall. Cellulose is the most abundant polysaccharide in the world, and its distribution is very wide. In general wood, cellulose accounts for 40%–50%, hemicellulose for 10%–30%, and lignin for 20%–30%. my country's agriculture is relatively developed, and the annual straw production is very large. The traditional method of straw processing is mainly to crush it and use it as organic fertilizer and feed. It can also be used for straw power generation, straw building materials, straw ethanol, industrial raw materials, livestock feed, and the production of microbial culture media.

[0003] The patent "CN105255953B Method for Physical-Chemical-Biological Pretreatment of Corn Stalks" uses a method of first physically treating corn stalks, then chemically treating them, and finally using bacteria to biologically treat the corn stalks to produce alcohol. However, according to the research paper "Ethanol Production from Corn Stalks (DOI:10.16844 / j.cnki.cn10-1007 / tk.2019.12.020)," the problem with biological treatment is the inability to properly solidify enzymes. Therefore, enzymatic hydrolysis often requires a large amount of enzyme, which is not conducive to long-term alcohol production. Chemical treatment methods mostly use acid treatment. If dilute acid hydrolysis is used, the main drawback is the low efficiency of glucose production, affecting the progress of later stages. If concentrated acid hydrolysis is used, the main drawbacks are the poor reaction time and the high concentration of sulfuric acid, which is highly corrosive, thus indirectly increasing the requirements for equipment. In addition, in the north, where wheat and corn are rotated, producers also face the problem of raw material changes. Because wheat straw is relatively denser than corn straw, the requirements for processing are relatively higher, and most equipment is not universal, which also affects the production efficiency of producers. Utility Model Content

[0004] This invention provides a straw-based alcohol production recycling system, which solves the problems of high enzyme loss during biological treatment, difficulty in balancing efficiency and time during chemical treatment, and poor equipment and raw material versatility.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A straw-based alcohol production recycling system includes a hydrolysis system and a fermentation distillation system connected in sequence; the hydrolysis system includes a physical hydrolysis system, a biological hydrolysis system, and a chemical hydrolysis system connected in sequence.

[0007] The biological hydrolysis system includes at least two biological hydrolysis tanks that are connected in parallel and interconnected.

[0008] In this preferred embodiment, the unhydrolyzed straw raw material is hydrolyzed in the hydrolysis system and then enters the fermentation and distillation system. The hydrolysis system is divided into a physical hydrolysis system, a biological hydrolysis system, and a chemical hydrolysis system to fully utilize the advantages of each part. Within the biological hydrolysis system, at least two parallel and interconnected biological hydrolysis tanks are used.

[0009] Furthermore, the straw-based alcohol production recycling system also includes a crushing system, the discharge end of which is connected to the feed end of the hydrolysis system, and the crushing system includes a crusher.

[0010] In this preferred embodiment, since the straw raw material is relatively regular, it is appropriately crushed in order to increase its contact area with the reaction reagents in each step of hydrolysis.

[0011] Furthermore, the feed end of the physical hydrolysis system is connected to the discharge end of the crushing system, and the physical hydrolysis system includes an ultrasonic hydrolysis tank.

[0012] In this preferred embodiment, the crushed straw first enters the physical hydrolysis system of the hydrolysis system, and is subjected to ultrasonic treatment in the ultrasonic hydrolysis tank to initially obtain hydrolysis products.

[0013] Furthermore, the biological hydrolysis system includes a first biological hydrolysis tank and a second biological hydrolysis tank; the feed ends of the first biological hydrolysis tank and the second biological hydrolysis tank are respectively connected to the discharge end of the physical hydrolysis system.

[0014] In this preferred embodiment, the product processed by the physical hydrolysis system enters the first and / or second biological hydrolysis tanks of the biological hydrolysis system for biological hydrolysis. Simultaneously, the first and second biological hydrolysis tanks are bidirectionally connected. The presence of the second biological hydrolysis tank not only doubles the efficiency of biological hydrolysis but also allows for adjustment of the number of devices used based on raw material output. Furthermore, since the second and first biological hydrolysis tanks use the same bacteria for hydrolysis, when the product from the first biological hydrolysis tank is transported to the subsequent system, the second biological hydrolysis tank can quickly transfer a portion of the contents containing hydrolyzing bacteria back to the first biological hydrolysis tank, eliminating the need to add hydrolyzing bacteria externally, saving costs, and achieving bacterial recycling. Even during production line shutdowns, a small amount of hydrolysis can be performed separately in the second biological hydrolysis tank to preserve the bacterial strain for later use.

[0015] Furthermore, the chemical hydrolysis system includes at least two interconnected chemical hydrolysis tanks.

[0016] In this preferred embodiment, at least two interconnected chemical hydrolysis tanks are used within the chemical hydrolysis system to achieve synergistic effects.

[0017] Furthermore, the chemical hydrolysis system includes a first chemical hydrolysis tank and a second chemical hydrolysis tank; the feed end of the first chemical hydrolysis tank is connected to the discharge end of the physical hydrolysis system and the first biological hydrolysis tank, respectively; the discharge end of the first chemical hydrolysis tank is connected to the second chemical hydrolysis tank.

[0018] In this preferred embodiment, the products from the physical or biological hydrolysis system enter the first chemical hydrolysis tank of the chemical hydrolysis system for chemical hydrolysis. Simultaneously, the first and second chemical hydrolysis tanks are bidirectionally connected. The presence of the second chemical hydrolysis tank doubles the efficiency of chemical hydrolysis, and the number of devices used can be adjusted according to the raw material output. Concentrated sulfuric acid is used for hydrolysis in the first chemical hydrolysis tank, while dilute sulfuric acid is used in the second chemical hydrolysis tank, resolving the difficulty in balancing efficiency and time during chemical processing. When using relatively compact wheat straw, the straw raw material from the crushing system sequentially passes through the physical, biological, and chemical hydrolysis systems; however, when using relatively loose corn straw, the biological hydrolysis system can be skipped.

[0019] Furthermore, the fermentation distillation system includes a fermenter and a distillation column connected in sequence;

[0020] The feed end of the fermenter is connected to the discharge ends of the first and second chemical hydrolysis tanks, respectively. The discharge end of the fermenter is connected to the feed end of the distillation column. One discharge end of the distillation column is connected to the second chemical hydrolysis tank. The other discharge end discharges the finished alcohol.

[0021] In this preferred embodiment, both chemical hydrolysis tanks can supply hydrolysis products to the fermentation distillation system. The fermentation distillation system outputs alcohol, while the remaining product after distillation, since the fermentation tanks still contain incompletely hydrolyzed cellulose raw materials, can still be fed back to the second chemical hydrolysis tank from the distillation column to continue the hydrolysis reaction, reducing raw material waste and achieving recycling.

[0022] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0023] (1) Since the straw raw material used in this utility model is relatively regular, it is appropriately crushed in order to increase its contact area with the reaction reagents in each step of hydrolysis. The unhydrolyzed straw raw material is hydrolyzed in the hydrolysis system and then enters the fermentation distillation system; the hydrolysis system is divided into a physical hydrolysis system (2), a biological hydrolysis system and a chemical hydrolysis system to make full use of the advantages of each part. In the biological hydrolysis system, at least two interconnected biological hydrolysis tanks are used; in the chemical hydrolysis system, at least two interconnected chemical hydrolysis tanks are used to exert a synergistic effect.

[0024] (2) In this utility model, the crushed straw first enters the physical hydrolysis system (2) of the hydrolysis system and undergoes ultrasonic treatment in the ultrasonic hydrolysis tank to initially obtain hydrolysis products. The products treated by the physical hydrolysis system (2) enter the first biological hydrolysis tank (3-1) of the biological hydrolysis system for biological hydrolysis. At the same time, the first biological hydrolysis tank (3-1) and the second biological hydrolysis tank (3-2) are bidirectionally connected. The existence of the second biological hydrolysis tank (3-2) not only doubles the efficiency of biological hydrolysis, but also allows for the control of the number of equipment used according to the raw material output. Since the second biological hydrolysis tank (3-2) and the first biological hydrolysis tank (3-1) use the same bacteria for hydrolysis, when the product of the first biological hydrolysis tank (3-1) is transported to the subsequent system, the second biological hydrolysis tank (3-2) can quickly transport some of the contents containing hydrolytic bacteria to the first biological hydrolysis tank (3-1), eliminating the need to add hydrolytic bacteria from the outside, saving costs, and realizing the recycling of bacteria. Even during production line shutdowns, a small amount of hydrolysis can be carried out separately in the second biological hydrolysis tank (3-2) to preserve the bacterial strain for later use.

[0025] (3) In this invention, the product from the physical hydrolysis system (2) or the biological hydrolysis system enters the first chemical hydrolysis tank (4-1) of the chemical hydrolysis system for chemical hydrolysis. At the same time, the first chemical hydrolysis tank (4-1) and the second chemical hydrolysis tank (4-2) are bidirectionally connected. The presence of the second biochemical tank (4-2) doubles the efficiency of chemical hydrolysis, and the number of devices used can be adjusted according to the raw material output. In the first chemical hydrolysis tank (4-1), we use concentrated sulfuric acid for hydrolysis, while in the second chemical hydrolysis tank (4-2), we use dilute sulfuric acid for hydrolysis, which solves the problem of the difficulty in balancing efficiency and time during chemical treatment. When using relatively compact wheat straw, the straw raw material from the crushing system (1) passes through the physical hydrolysis system (2), the biological hydrolysis system, and the chemical hydrolysis system in sequence; while when using relatively loose corn straw, the biological hydrolysis system can be skipped.

[0026] (4) In this invention, both chemical hydrolysis tanks can supply hydrolysis products to the fermentation distillation system. In the fermentation distillation system, the output is alcohol, while the remaining product after fermentation distillation, since the fermentation tank (5-1) still contains incompletely hydrolyzed cellulose raw materials, can still be fed back to the second chemical hydrolysis tank (4-2) from the distillation tower (5-2) to continue the hydrolysis reaction, reducing the waste of raw materials and realizing recycling. Attached Figure Description

[0027] Figure 1 This is a diagram of the straw-based alcohol production cycle system of this utility model.

[0028] In the diagram: 1. Crushing system; 2. Physical hydrolysis system; 3-1. First biological hydrolysis tank; 3-2. Second biological hydrolysis tank; 4-1. First chemical hydrolysis tank; 4-2. Second chemical hydrolysis tank; 5-1. Fermentation tank; 5-2. Distillation column.

[0029] Figure 2 This is a connection diagram of a biological hydrolysis system. Detailed Implementation

[0030] To enable those skilled in the art to more clearly understand the technical solutions of this application, the technical solutions of this application will be described in detail below with reference to specific embodiments. It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains.

[0031] Example 1

[0032] See attached document Figure 1 and Figure 2As shown, this embodiment of the invention provides a straw-based alcohol production recycling system, comprising a hydrolysis system and a fermentation distillation system connected in sequence. The hydrolysis system includes a physical hydrolysis system 2, a biological hydrolysis system, and a chemical hydrolysis system connected in sequence. The biological hydrolysis system includes at least two parallel and interconnected biological hydrolysis tanks. The straw-based alcohol production recycling system also includes a crushing system 1, the discharge end of which is connected to the feed end of the hydrolysis system. The crushing system 1 includes a crusher. The feed end of the physical hydrolysis system 2 is connected to the discharge end of the crushing system 1. The physical hydrolysis system 2 includes an ultrasonic hydrolysis tank. The biological hydrolysis system includes a first biological hydrolysis tank 3-1 and a second biological hydrolysis tank 3-2; the feed ends of the first biological hydrolysis tank 3-1 and the second biological hydrolysis tank 3-2 are respectively connected to the discharge end of the physical hydrolysis system 2. The chemical hydrolysis system includes at least two interconnected chemical hydrolysis tanks. The chemical hydrolysis system includes a first chemical hydrolysis tank 4-1 and a second chemical hydrolysis tank 4-2; the feed end of the first chemical hydrolysis tank 4-1 is connected to the discharge ends of the physical hydrolysis system 2 and the first biological hydrolysis tank 3-1, respectively; the discharge end of the first chemical hydrolysis tank 4-1 is connected to the second chemical hydrolysis tank 4-2. The fermentation distillation system includes a fermenter 5-1 and a distillation column 5-2 connected in sequence; the feed end of the fermenter 5-1 is connected to the discharge ends of the first chemical hydrolysis tank 4-1 and the second chemical hydrolysis tank 4-2, respectively; the discharge end of the fermenter 5-1 is connected to the feed end of the distillation column 5-2; one discharge end of the distillation column 5-2 is connected to the second chemical hydrolysis tank 4-2; the other discharge end discharges the finished alcohol.

[0033] In operation, we used the "CS-2000" equipment from Zhejiang Pengrui Fluid Technology Co., Ltd. as the ultrasonic extraction tank, the "FJG-5000" biological hydrolysis tank as the biological hydrolysis tank, and the "FJG-5000" with an acid-resistant liner as the chemical hydrolysis tank. Because the straw raw material is relatively uniform, it was appropriately crushed to increase its contact area with the reaction reagents in each hydrolysis step. The unhydrolyzed straw raw material was hydrolyzed in the hydrolysis system and then entered the fermentation distillation system 5. The hydrolysis system was divided into a physical hydrolysis system 2, a biological hydrolysis system, and a chemical hydrolysis system to fully utilize the advantages of each part. Within the biological hydrolysis system, at least two interconnected biological hydrolysis tanks were used; within the chemical hydrolysis system, at least two interconnected chemical hydrolysis tanks were used to achieve synergistic effects. The crushed straw first entered the physical hydrolysis system 2 of the hydrolysis system and underwent ultrasonic treatment in the ultrasonic hydrolysis tank to initially obtain the hydrolysis products. The product processed by physical hydrolysis system 2 enters the first biological hydrolysis tank 3-1 in the biological hydrolysis system for biological hydrolysis. Simultaneously, the first biological hydrolysis tank 3-1 and the second biological hydrolysis tank 3-2 are bidirectionally connected. The presence of the second biological hydrolysis tank 3-2 not only doubles the efficiency of biological hydrolysis but also allows for adjustment of the number of devices used based on raw material output. Furthermore, since the second biological hydrolysis tank 3-2 and the first biological hydrolysis tank 3-1 use the same bacteria for hydrolysis, when the product from the first biological hydrolysis tank 3-1 is transported to the subsequent system, the second biological hydrolysis tank 3-2 can quickly transfer a portion of the contents containing hydrolyzing bacteria back to the first biological hydrolysis tank 3-1, eliminating the need to add hydrolyzing bacteria externally, saving costs, and achieving bacterial recycling. Even during production line shutdowns, a small amount of hydrolysis can be carried out separately in the second biological hydrolysis tank 3-2 to preserve the bacterial strain for later use. Products from physical hydrolysis system 2 or the biological hydrolysis system enter the first chemical hydrolysis tank 4-1 in the chemical hydrolysis system for chemical hydrolysis. Meanwhile, the first chemical hydrolysis tank 4-1 and the second chemical hydrolysis tank 4-2 are bidirectionally connected. The presence of the second biochemical tank 4-2 doubles the efficiency of chemical hydrolysis, and the number of devices used can be adjusted according to the raw material output. In the first chemical hydrolysis tank 4-1, concentrated sulfuric acid is used for hydrolysis, while in the second chemical hydrolysis tank 4-2, dilute sulfuric acid is used, solving the problem of balancing efficiency and time during chemical treatment. When using relatively compact wheat straw, the straw raw material from the crushing system 1 passes through the physical hydrolysis system 2, the biological hydrolysis system, and the chemical hydrolysis system sequentially; while when using relatively loose corn straw, the biological hydrolysis system can be skipped. Both chemical hydrolysis tanks can supply hydrolysis products to the fermentation distillation system 5.In the fermentation distillation system 5, the output is alcohol. The remaining product after fermentation distillation, since the fermentation tank still contains incompletely hydrolyzed cellulose raw materials and some dilute sulfuric acid, can still be fed back to the second chemical hydrolysis tank 4-2 from the distillation tower to continue the hydrolysis reaction, reducing the waste of raw materials and reagent sulfuric acid and realizing recycling.

[0034] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A straw-based alcohol production recycling system, characterized in that, It includes a hydrolysis system and a fermentation distillation system connected in sequence; the hydrolysis system includes a physical hydrolysis system (2), a biological hydrolysis system and a chemical hydrolysis system connected in sequence; The biological hydrolysis system includes at least two biological hydrolysis tanks that are connected in parallel and interconnected.

2. The straw-based alcohol production recycling system according to claim 1, characterized in that, The straw-based alcohol production recycling system also includes a crushing system (1), the discharge end of which is connected to the feed end of the hydrolysis system, and the crushing system (1) includes a crusher.

3. The straw-based alcohol production recycling system according to claim 2, characterized in that, The feed end of the physical hydrolysis system (2) is connected to the discharge end of the crushing system (1), and the physical hydrolysis system (2) includes an ultrasonic hydrolysis tank.

4. The straw-based alcohol production recycling system according to claim 3, characterized in that, The biological hydrolysis system includes a first biological hydrolysis tank (3-1) and a second biological hydrolysis tank (3-2); the feed ends of the first biological hydrolysis tank (3-1) and the second biological hydrolysis tank (3-2) are respectively connected to the discharge end of the physical hydrolysis system (2).

5. The straw-based alcohol production recycling system according to claim 4, characterized in that, The chemical hydrolysis system includes at least two interconnected chemical hydrolysis tanks.

6. The straw-based alcohol production recycling system according to claim 5, characterized in that, The chemical hydrolysis system includes a first chemical hydrolysis tank (4-1) and a second chemical hydrolysis tank (4-2); the feed end of the first chemical hydrolysis tank (4-1) is connected to the discharge end of the physical hydrolysis system (2) and the first biological hydrolysis tank (3-1); the discharge end of the first chemical hydrolysis tank (4-1) is connected to the second chemical hydrolysis tank (4-2).

7. The straw-based alcohol production recycling system according to claim 6, characterized in that, The fermentation distillation system includes a fermenter (5-1) and a distillation column (5-2) connected in sequence; The feed end of the fermenter (5-1) is connected to the discharge ends of the first chemical hydrolysis tank (4-1) and the second chemical hydrolysis tank (4-2), respectively. The discharge end of the fermenter (5-1) is connected to the feed end of the distillation column (5-2). One discharge end of the distillation column (5-2) is connected to the second chemical hydrolysis tank (4-2). The other discharge end discharges the finished alcohol.

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