Fiber material multi-stage fermentation process system

Abstract

The utility model relates to the technical field of fiber material fermentation, and provides a fiber material multistage fermentation process system which comprises an acidification working section, a primary fermentation working section and a secondary fermentation working section, an acidification heating system and an acidification stirring system are both arranged in an acidification pool, and the acidification pool is used for bearing fiber materials subjected to primary physical crushing; the acidification heating system and the acidification stirring system are used for stirring and heating; the first-stage heating system and the first-stage stirring system are both arranged in the first-stage fermentation reactor, and the first-stage fermentation reactor is used for bearing fiber materials passing through the acidification workshop section and stirring and heating the fiber materials through the first-stage heating system and the first-stage stirring system; the second-stage heating system and the second-stage stirring system are both arranged in the second-stage fermentation reactor, and the second-stage fermentation reactor is used for bearing the fiber material subjected to anaerobic treatment in the first-stage fermentation section and stirring and heating the fiber material through the second-stage heating system and the second-stage stirring system. And a high-efficiency, low-energy-consumption and stable multi-stage fermentation process of the fiber material is realized.

Description

Technical Field

[0001] This utility model relates to the field of fibrous material fermentation technology, and in particular to a multi-stage fermentation process system for fibrous materials. Background Technology

[0002] The domestic fiber material processing technology is relatively backward, mainly adopting traditional mechanical processing methods such as screening, crushing, and washing, which have low processing efficiency, high energy consumption, and serious environmental pollution.

[0003] In recent years, some domestic enterprises have begun to introduce advanced foreign fiber material processing technologies, such as air separation, magnetic separation, and flotation, which have improved processing efficiency and reduced energy consumption and environmental pollution. They have also introduced biological treatment processes, such as enzymatic hydrolysis and microbial fermentation.

[0004] Among them, microbial fermentation technology has the characteristics of low cost, high scalability, high processing efficiency and low energy consumption among many treatment methods, and has become the preferred treatment process in the industry. The main directions of fibrous material fermentation technology include the following: (1) Solid fermentation: refers to the process of fermentation with one or more microorganisms in a water-insoluble solid substrate with a certain humidity, where there is little or no free water. (2) Liquid fermentation: refers to a fermentation process in which the material contains a high moisture content during microbial fermentation. (3) Semi-solid fermentation: is a fermentation method between solid fermentation and liquid fermentation, in which the fermentation environment has a certain fluidity, but is not completely liquid.

[0005] However, the existing fermentation processes for fiber materials have the following shortcomings: (1) Solid-state fermentation: low water content, generally between 40% and 60%; therefore, the mass transfer and oxygen transfer efficiency is relatively low, and the fermentation cycle is usually long; and the heat generated during fermentation is not easily dissipated, which can easily lead to excessively high local temperatures, requiring better ventilation and heat dissipation measures. (2) Liquid-state fermentation: high water content, generally between 90% and 99%, large equipment volume or floor space, large investment, and high material requirements and difficulty in processing downstream fermentation products. (3) Semi-solid-state fermentation: the water content of the culture medium is usually between 60% and 80%, combining some of the advantages and disadvantages of solid-state fermentation and liquid-state fermentation; the mass transfer and heat transfer effects are better than solid-state fermentation, but not as uniform as liquid-state fermentation; the microbial growth environment is relatively complex, with both solid particles and liquid materials, requiring relatively high control of fermentation conditions.

[0006] Currently, liquid fermentation is the mainstream process, while successful applications of solid-state and semi-solid-state processes in the fermentation treatment of fibrous materials are extremely rare. Based on the above analysis of the shortcomings of fermentation processes, there is currently no efficient, low-energy-consumption, and stable fermentation process for fibrous materials. Utility Model Content

[0007] This invention provides a multi-stage fermentation process system for fiber materials, which solves the defects of low efficiency, high energy consumption and instability in the fermentation treatment of fiber materials in the prior art, and realizes a high-efficiency, low-energy consumption and stable multi-stage fermentation process for fiber materials.

[0008] This utility model provides a multi-stage fermentation process system for fibrous materials, comprising an acidification section, a primary fermentation section, and a secondary fermentation section connected in sequence;

[0009] The acidification section includes an acidification tank, an acidification heating system, and an acidification stirring system. The acidification heating system and the acidification stirring system are both located in the acidification tank. The acidification tank is used to hold the fibrous material after primary physical crushing, and is stirred and heated by the acidification heating system and the acidification stirring system.

[0010] The primary fermentation section includes a primary fermentation reactor, a primary heating system, and a primary stirring system. The primary heating system and the primary stirring system are both located inside the primary fermentation reactor. The primary fermentation reactor is used to hold the fibrous material after the acidification section and is stirred and heated by the primary heating system and the primary stirring system.

[0011] The secondary fermentation section includes a secondary fermentation reactor, a secondary heating system, and a secondary stirring system. The secondary heating system and the secondary stirring system are both located inside the secondary fermentation reactor. The secondary fermentation reactor is used to hold the fibrous material after anaerobic treatment in the primary fermentation section, and is stirred and heated by the secondary heating system and the secondary stirring system.

[0012] According to the present invention, a multi-stage fermentation process system for fiber materials is provided, wherein the acidification tank has a mixing section, a pre-hydrolysis section and a hydrolysis section connected in sequence. The fiber material is mixed with reflux biogas slurry and dilution water in the mixing section, grows in the pre-hydrolysis section to adapt to the operating environment of the acidification tank, and then reproduces and decomposes organic matter in the hydrolysis section.

[0013] According to the present invention, a multi-stage fermentation process system for fiber materials is provided, which further includes multiple conveying systems. The multiple conveying systems are respectively connected between the acidification section and the primary fermentation section and between the primary fermentation section and the secondary fermentation section. The conveying systems are used to transfer the fiber materials sequentially in the acidification section, the primary fermentation section and the secondary fermentation section.

[0014] According to the multi-stage fermentation process system for fibrous materials provided by this utility model, it also includes multiple sets of pipelines, valves, electrical and instrumentation control systems, which are correspondingly set up with the acidification section, the primary fermentation section and the secondary fermentation section.

[0015] According to the present invention, a multi-stage fermentation process system for fibrous materials is provided, wherein a coarse screen is provided at the feed inlet of the acidification tank, and the coarse screen is used to disperse the fibrous materials entering the acidification tank.

[0016] According to the present invention, a multi-stage fermentation process system for fibrous materials is provided, wherein the acidification and stirring system adopts a horizontal stirrer.

[0017] According to the present invention, a multi-stage fermentation process system for fibrous materials is provided, wherein the primary stirring system includes a vertical shaft stirrer and multiple primary side-mounted mechanical stirrers. The vertical shaft stirrer is located at the center of the primary fermentation reactor, and the multiple primary side-mounted mechanical stirrers are arranged around the side walls of the primary fermentation reactor.

[0018] According to the present invention, a multi-stage fermentation process system for fibrous materials is provided, wherein the acidification heating system is a carbon steel pipe heating system;

[0019] Alternatively, the primary heating system may be a carbon steel coil heating system;

[0020] Alternatively, the secondary heating system may be a carbon steel coil heating system.

[0021] According to the present invention, a multi-stage fermentation process system for fiber materials is provided, the multi-stage fermentation process system for fiber materials further includes a crushing and cutting section, which is located at the front end of the acidification section, and is used to crush the fiber materials into primary materials.

[0022] According to the present invention, a multi-stage fermentation process system for fiber materials is provided, wherein the multi-stage fermentation process system for fiber materials further includes a biogas slurry treatment section, which is located at the rear end of the secondary fermentation section and is connected to the secondary fermentation section through the conveying system.

[0023] This invention provides a multi-stage fermentation process system for fibrous materials. By adopting a multi-stage fermentation method, it improves the efficiency of biological fermentation, reduces process short-circuiting, and increases the time for biodecomposition, thereby achieving the goal of efficient, low-energy, and stable treatment of fibrous materials. Compared with single-stage fermentation, multi-stage fermentation achieves precise control of each stage by implementing anaerobic fermentation in stages, which is more conducive to maintaining the growth and metabolic environment of different microorganisms, keeping the microorganisms in an optimal active environment, and ensuring their activity and treatment effect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the system connection of an embodiment of the multi-stage fermentation process system for fibrous materials provided by this utility model.

[0026] Figure 2 This is a schematic diagram of the acidification stage in the multi-stage fermentation process system for fiber materials provided by this utility model.

[0027] Figure 3 This is a schematic diagram of the structure of the primary fermentation section and the secondary fermentation section in an embodiment of the multi-stage fermentation process system for fiber materials provided by this utility model.

[0028] Figure label:

[0029] 10. Multi-stage fermentation process system for fibrous materials;

[0030] 100. Acidification section; 110. Acidification tank; 120. Acidification heating system; 130. Acidification stirring system; 131. Horizontal stirrer;

[0031] 200. Primary fermentation section; 210. Primary fermentation reactor; 220. Primary heating system; 230. Primary mixing system; 231. Vertical shaft agitator; 232. Primary side-mounted mechanical agitator;

[0032] 300. Secondary fermentation section; 310. Secondary fermentation reactor; 320. Secondary heating system; 330. Secondary stirring system; 331. Secondary side-mounted mechanical stirrer. Detailed Implementation

[0033] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0034] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0036] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The following is combined with Figures 1 to 3The present invention will provide a detailed description of a multi-stage fermentation process system for fibrous materials through specific embodiments and application scenarios.

[0039] In the embodiments of this utility model, such as Figure 1 As shown, a multi-stage fermentation process system 10 for fiber materials includes an acidification section 100, a primary fermentation section 200, and a secondary fermentation section 300 connected in sequence. The acidification section 100 includes an acidification tank 110, an acidification heating system 120, and an acidification stirring system 130. The acidification heating system 120 and the acidification stirring system 130 are both located within the acidification tank 110. The acidification tank 110 is used to hold the fiber material after primary physical crushing, and the acidification heating system 120 and the acidification stirring system 130 are used for stirring and heating. The primary fermentation section 200 includes a primary fermentation reactor 210, a primary heating system 220, and a primary stirring system 230. The primary heating system 220... Both the primary stirring system 230 and the primary stirring system 210 are located within the primary fermentation reactor 210. The primary fermentation reactor 210 is used to hold the fiber material after the acidification stage 100 and is stirred and heated by the primary heating system 220 and the primary stirring system 230. The secondary fermentation stage 300 includes a secondary fermentation reactor 310, a secondary heating system 320, and a secondary stirring system 330. Both the secondary heating system 320 and the secondary stirring system 330 are located within the secondary fermentation reactor 310. The secondary fermentation reactor 310 is used to hold the fiber material after the anaerobic treatment of the primary fermentation stage and is stirred and heated by the secondary heating system 320 and the secondary stirring system 330.

[0040] This application improves the efficiency of biological fermentation, reduces process short-circuiting, and increases biodegradation time by adopting a multi-stage fermentation method, thereby achieving the goal of efficient, low-energy, and stable treatment of fibrous materials. Compared with single-stage fermentation, multi-stage fermentation achieves precise control of each stage by implementing anaerobic fermentation in stages, which is more conducive to maintaining the growth and metabolic environment of different microorganisms, keeping the microorganisms in the optimal active environment, and ensuring their activity and treatment effect.

[0041] In one specific embodiment, reference is made to Figures 1 to 3 The multi-stage fermentation process system for fiber materials is divided into three sections: acidification section 100, primary fermentation section 200, and secondary fermentation section 300.

[0042] The acidification section 100 includes: one acidification tank 110, one acidification heating system 120, four acidification stirring systems 130, one coarse screen, one conveying system, and one set of pipeline valves and electrical instrumentation control.

[0043] Acidification tank 110 is a polygonal tank with dimensions of 16.5×4.5×5.3m, constructed as an underground concrete structure. The acidification heating system 120 uses two sets of 80mm diameter carbon steel pipe heating systems, with a target heating temperature of 35℃. The acidification stirring system 130 uses a horizontal stirrer 131 with a speed of 3-10 rpm and two power specifications: 15kW and 18.5kW, resulting in a stirring power of 130-150W / m³. 3 The coarse grating uses stainless steel mesh, with a 50×50mm square grid.

[0044] In acidification section 100, after the fibrous material undergoes primary physical crushing in the crushing and cutting section, it is unloaded into the feed inlet via a transport vehicle or conveying system. The feed inlet is equipped with a coarse screen to effectively separate the material, preventing it from clumping together and falling into acidification tank 110. Acidification tank 110 employs a multi-stage continuous hydrolysis acidification process, dividing the tank into three sections. The first section is a preliminary mixing section, where, under the combined action of the returned biogas slurry and process dilution water, the fresh material entering the tank is quickly submerged below the liquid surface by the agitator blades. Simultaneously, the movement of the blades breaks up any clumps on the liquid surface, effectively preventing the fibrous material from floating and clumping. Meanwhile, the mixed material moves slowly and orderly to the next section under the propulsion of the agitator. The second section is a pre-hydrolysis section, where, after preliminary mixing and contact, the returned biogas slurry... During this stage, the microorganisms carried by the liquid gradually adapt to the operating environment of acidification tank 110, such as suitable temperature, appropriate stirring intensity, and sufficient organic substrate. At this time, species including Bacteroides, Bacillus, and Syntrophomonas gradually become active and carry out normal growth and metabolism under synergistic effects. The third stage is the hydrolysis stage. After pre-hydrolysis, the fiber material rapidly multiplies in an environment with suitable temperature, stirring intensity, and organic nutrients, decomposing the organic matter in the fiber material more thoroughly. Since the acid production effect is most obvious in this stage, the pH reaches the optimal level.

[0045] The concentration range of the material in the acidification tank 110 is 15-18%. Therefore, when the acidification tank 110 is not in the feeding or discharging period, the material at the end of the acidification tank 110 can flow back to the beginning end, thereby driving and accelerating the hydrolysis effect of the fiber material.

[0046] The primary fermentation section 200 includes: one primary fermentation reactor 210, one primary heating system 220, five primary stirring systems 230, one conveying system, and one set of pipeline, valve, electrical, and instrumentation control systems.

[0047] The primary fermentation tank is a cylindrical reactor with dimensions of φ29.0×8.6m, constructed of above-ground carbon steel. The primary heating system 220 uses 80mm diameter carbon steel coils, with a total of 4 coils, and a target heating temperature of 42-44℃. The primary mixing system 230 consists of 4 sets of primary side-mounted mechanical agitators 232, with a speed of 38rpm and a power of 15kW; and 1 set of vertical shaft agitator 231, with a speed of 13.4rpm and a power of 22kW, resulting in a mixing power of 10-15W / m³. 3 .

[0048] The primary fermentation section 200 further utilizes the pretreated material from the acidification tank 110. The fiber mixture is conveyed to the primary fermentation reactor 210 via a conveying system. The primary fermentation reactor 210 employs the CSTR fermentation process, with bottom feeding and middle discharge. The discharge and sludge discharge pipes are connected in parallel, and the fermentation liquid is then conveyed to the secondary fermentation reactor 310 via a conveying system. The primary fermentation reactor 210 has a central vertical shaft agitator 231 equipped with a shell-breaking device, and four primary side-mounted mechanical agitators 232 are installed on its side walls. During normal operation, the material power within the primary fermentation reactor 210 mainly comes from the four primary side-mounted mechanical agitators 232. Because these agitators are positioned along the reactor circumference, incomplete material reaction may occur at the bottom and surface of the reactor, leading to bottom sedimentation and surface crust formation. Therefore, a central vertical shaft agitator 231 is installed to prevent bottom sedimentation and surface crust breaking, and is activated as needed based on operating conditions to ensure optimal operation. The material in acidification tank 110 is about 15.5%. After the fresh material is mixed with the fermented material in the primary fermentation reactor 210, its concentration is about 13.9%. The combination of agitators is used to fully mix the high concentration of fibrous material and microorganisms in the reactor, ensuring uniform mixing in the reactor, promoting the transfer of organic matter and energy, and ensuring the long-term stable operation of the anaerobic reactor.

[0049] The secondary fermentation section 300 includes: one secondary fermentation reactor 310, one secondary heating system 320, four secondary stirring systems 330, one conveying system, and one set of pipeline, valve, electrical and instrumentation control.

[0050] The secondary fermentation tank is a cylindrical reactor with dimensions of φ29.0×8.6m, and is an above-ground carbon steel structure. The secondary heating system 320 uses 80mm diameter carbon steel coils, with a total of 4 coils, and a target heating temperature of 42-44℃. The secondary stirring system 330 uses four sets of secondary side-mounted mechanical stirrers 331, with a rotation speed of 38rpm and a power of 15kW, resulting in a stirring power of 8-12W / m³. 3 .

[0051] The secondary fermentation section 300 is for the advanced treatment and utilization of the fermented material from the primary reactor. The fermented material is transported to the secondary fermentation reactor 310 via a conveying system. The secondary fermentation reactor 310 also employs the CSTR fermentation process, with bottom feeding and middle discharge. The discharge and sludge discharge pipes are connected in parallel, and the fermentation liquid is then transported to the downstream biogas slurry treatment section via a conveying system. Four sets of primary side-mounted mechanical agitators 232 are installed on the side walls of the secondary fermentation reactor 310. During normal operation, because the fibrous material has already undergone acidification hydrolysis and primary fermentation degradation in the acidification tank 110 and the primary fermentation reactor 210, the material characteristics in the secondary fermentation reactor 310 tend towards deep decomposition, with almost no sedimentation or scum. The material concentration in the secondary fermentation reactor 310 is approximately 11.5%, and the degradation rate and effect are more significant and thorough than in the primary reactor.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-stage fermentation process system for fibrous materials, characterized in that, It includes an acidification section, a primary fermentation section, and a secondary fermentation section connected in sequence; The acidification section includes an acidification tank, an acidification heating system, and an acidification stirring system. The acidification heating system and the acidification stirring system are both located in the acidification tank. The acidification tank is used to hold the fibrous material after primary physical crushing, and is stirred and heated by the acidification heating system and the acidification stirring system. The primary fermentation section includes a primary fermentation reactor, a primary heating system, and a primary stirring system. The primary heating system and the primary stirring system are both located inside the primary fermentation reactor. The primary fermentation reactor is used to hold the fibrous material after the acidification section and is stirred and heated by the primary heating system and the primary stirring system. The secondary fermentation section includes a secondary fermentation reactor, a secondary heating system, and a secondary stirring system. The secondary heating system and the secondary stirring system are both located inside the secondary fermentation reactor. The secondary fermentation reactor is used to hold the fibrous material after anaerobic treatment in the primary fermentation section, and is stirred and heated by the secondary heating system and the secondary stirring system.

2. The multi-stage fermentation process system for fibrous materials according to claim 1, characterized in that, The acidification tank has a mixing section, a pre-hydrolysis section and a hydrolysis section connected in sequence. The fiber material is mixed with the recycled biogas slurry and dilution water in the mixing section, grows in the pre-hydrolysis section to adapt to the operating environment of the acidification tank, and then reproduces and decomposes organic matter in the hydrolysis section.

3. The multi-stage fermentation process system for fibrous materials according to claim 1, characterized in that, It also includes multiple conveying systems, which are respectively connected between the acidification section and the primary fermentation section, and between the primary fermentation section and the secondary fermentation section. The conveying systems are used to transfer the fiber material sequentially between the acidification section, the primary fermentation section and the secondary fermentation section.

4. The multi-stage fermentation process system for fibrous materials according to claim 1, characterized in that, It also includes multiple sets of pipeline valve electrical instrumentation and control systems, which are set up corresponding to the acidification section, the primary fermentation section, and the secondary fermentation section.

5. The multi-stage fermentation process system for fibrous materials according to claim 1, characterized in that, The acidification tank is equipped with a coarse screen at the feed inlet, which is used to disperse the fibrous material entering the acidification tank.

6. The multi-stage fermentation process system for fibrous materials according to any one of claims 1-5, characterized in that, The acidification stirring system uses a horizontal stirrer.

7. The multi-stage fermentation process system for fibrous materials according to any one of claims 1-5, characterized in that, The primary mixing system includes a vertical shaft agitator and multiple primary side-mounted mechanical agitators. The vertical shaft agitator is located at the center of the primary fermentation reactor, and the multiple primary side-mounted mechanical agitators are arranged around the side walls of the primary fermentation reactor.

8. The multi-stage fermentation process system for fibrous materials according to any one of claims 1-5, characterized in that, The acidification heating system is a carbon steel pipe heating system; Alternatively, the primary heating system may be a carbon steel coil heating system; Alternatively, the secondary heating system may be a carbon steel coil heating system.

9. The multi-stage fermentation process system for fibrous materials according to claim 3, characterized in that, The multi-stage fermentation process system for fiber materials also includes a crushing and cutting section, which is located at the front end of the acidification section and is used to crush the fiber materials into primary materials.

10. The multi-stage fermentation process system for fibrous materials according to claim 3, characterized in that, The multi-stage fermentation process system for fiber materials also includes a biogas slurry treatment section, which is located at the rear end of the secondary fermentation section and connected to the secondary fermentation section through the conveying system.

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