Pretreatment combined system for fermentation materials with different concentrations

Abstract

The utility model relates to the technical field of fermentation, and provides a pretreatment combination system for fermentation materials with different concentrations, which comprises a dry material pretreatment unit, a wet material pretreatment unit and an anaerobic fermentation unit, the dry material pretreatment unit is suitable for mixing, heating, stirring and pre-hydrolyzing high-concentration fiber materials and / or low-concentration materials; the wet material pretreatment unit is communicated with the dry material pretreatment unit, and the wet material pretreatment unit is suitable for removing impurities and preheating wet materials; the anaerobic fermentation unit is used for receiving the materials treated by the dry material pretreatment unit and the materials treated by the wet material pretreatment unit for anaerobic fermentation; the dry material pretreatment unit comprises a material mixing pool and a plurality of high-concentration material stirrers, the high-concentration material stirrers are arranged in the material mixing pool side by side, and the high-concentration material stirrers are horizontally arranged and are adjacent to one another. The fermentation total solid concentration (TS) of the pretreatment process can be increased to 16% or above.

Description

Technical Field

[0001] The utility model relates to the technical field of fermentation, in particular to a combined system for pretreatment of fermentation materials with different concentrations. Background Art

[0002] In order to improve the gas production efficiency of fiber raw materials, most of the existing biogas projects are equipped with mixed raw materials, one part is fiber raw materials, and the other part is fecal sewage. The addition of fecal sewage can improve the lack of nutrients such as N and P in the fermentation of fiber raw materials. Due to the different characteristics of the raw materials, different processes are selected for the conventional fermentation pretreatment tank, and they all operate independently.

[0003] The residence time of the pretreatment tank body for treating high-concentration straw fermentation raw materials is generally about 2 days, and the residence time of the pretreatment tank body for low-concentration fermentation raw materials is generally about 1 day. After adjusting the concentration and temperature in the tank, they are respectively transported to the anaerobic fermentation unit through their respective supporting feeding systems.

[0004] In the related art, the existing pretreatment tank body is usually equipped with a mixer, but the existing mixer is prone to form a mixing dead angle and cause material accumulation around the tank body, resulting in unstable operation of the pretreatment system. Summary of the Utility Model

[0005] The utility model provides a combined system for pretreatment of fermentation materials with different concentrations, which is used to solve the technical defects that the existing mixer in the prior art is prone to form a mixing dead angle and cause material accumulation around the tank body, and the function of the existing mixer is only applicable to the fermentation total solid concentration (TS) in the pretreatment tank body being relatively low. The application can increase the fermentation total solid concentration (TS) of the pretreatment process to more than 16%.

[0006] The utility model provides a combined system for pretreatment of fermentation materials with different concentrations, including:

[0007] A dry material pretreatment unit, which is suitable for mixing, heating, stirring and pre-hydrolyzing high-concentration fiber materials and / or low-concentration materials;

[0008] A wet material pretreatment unit, which is arranged in communication with the dry material pretreatment unit and is suitable for removing impurities and pre-heating wet materials;

[0009] An anaerobic fermentation unit, which is connected to the dry material pretreatment unit and the wet material pretreatment unit, and is used to receive the materials processed by the dry material pretreatment unit and the materials processed by the wet material pretreatment unit for anaerobic fermentation;

[0010] Among them, the dry material pretreatment unit includes a mixing tank and a plurality of high-concentration material stirrers. The plurality of high-concentration material stirrers are arranged side by side in the mixing tank. The high-concentration material stirrers are horizontally arranged, and the plurality of high-concentration material stirrers are adjacent to each other.

[0011] According to a pretreatment combination system for fermentation materials with different concentrations provided by the present invention, the mixing tank includes a first pool wall, a second pool wall, a third pool wall, and a fourth pool wall that are sequentially connected end to end. The high-concentration material stirrers are connected between the second pool wall and the fourth pool wall, and the plurality of high-concentration material stirrers are arranged in parallel between the first pool wall and the third pool wall.

[0012] According to a pretreatment combination system for fermentation materials with different concentrations provided by the present invention, a material feeding port is formed above the mixing tank and close to one side of the first pool wall. The material feeding port is provided with a coarse grid, and at least one high-concentration material stirrer is arranged below the material feeding port.

[0013] According to a pretreatment combination system for fermentation materials with different concentrations provided by the present invention, the high-concentration material stirrer includes a stirring shaft and a plurality of stirring blades. The plurality of stirring blades are symmetrically arranged in pairs on the stirring shaft. When two adjacent high-concentration material stirrers rotate, the stirring blades located in the same plane are staggered from each other.

[0014] According to a pretreatment combination system for fermentation materials with different concentrations provided by the present invention, the number of the high-concentration material stirrers is four. One of the four high-concentration material stirrers is arranged close to the material feeding port, and the remaining high-concentration material stirrers are arranged in parallel in the middle of the mixing tank.

[0015] According to a pretreatment combination system for fermentation materials with different concentrations provided by the present invention, the pretreatment combination system for fermentation materials with different concentrations further includes a biogas slurry reflux pipeline. The anaerobic fermentation unit refluxes biogas slurry to the dry material pretreatment unit or the wet material pretreatment unit through the biogas slurry reflux pipeline to adjust the total solid concentration of fermentation in the dry material pretreatment unit or the wet material pretreatment unit.

[0016] According to a pretreatment combination system for fermentation materials with different concentrations provided by the present invention, the dry material pretreatment unit further includes a heating module. The heating module includes a heating plate and a heating circulation pipeline. The heating plate is arranged on the pool wall of the mixing tank, and the heating circulation pipeline is communicated with the heating plate.

[0017] According to a pre-treatment combined system for fermentation materials with different concentrations provided by the present utility model, the wet material pre-treatment unit includes a homogenization tank and a vertical shaft stirrer. The vertical shaft stirrer is arranged in the homogenization tank and is applicable to stir the wet materials in the homogenization tank.

[0018] According to a pre-treatment combined system for fermentation materials with different concentrations provided by the present utility model, a sand settling hopper is arranged at the bottom of the homogenization tank, and a scraper is arranged at the position of the vertical shaft stirrer corresponding to the sand settling hopper.

[0019] According to a pre-treatment combined system for fermentation materials with different concentrations provided by the present utility model, the wet material pre-treatment unit further includes a screw sand conveyor. The screw sand conveyor is communicated with the bottom of the homogenization tank and is applicable to discharge the sediments at the bottom of the homogenization tank out of the homogenization tank.

[0020] In the pre-treatment combined system for fermentation materials with different concentrations provided by the present utility model, due to the relatively high solid content rate of the raw materials of the high-concentration fiber materials and low-concentration materials, in this application, a plurality of high-concentration material stirrers are arranged in the mixing tank. The plurality of high-concentration material stirrers are arranged horizontally side by side in the mixing tank and are adjacent to each other, so as to fully mix the materials and microorganisms in the mixing tank, ensure that the stirring in the mixing tank is uniform without dead corners, and effectively promote the exchange of substances and energy. And the high-concentration material stirrers have a shell-breaking effect on the liquid surface and a disturbing effect on the bottom, ensuring the uniformity and stability of the materials and forming a material concentration gradient. In this way, the total solid concentration of fermentation applicable to the dry material pre-treatment unit is significantly increased, and the total solid concentration of fermentation is increased by up to 16%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a process flow schematic diagram of the pre-treatment combined system for fermentation materials with different concentrations provided by the present utility model.

[0023] Figure 2 is a connection schematic diagram of an embodiment of the pre-treatment combined system for fermentation materials with different concentrations provided by the present utility model.

[0024] Figure 3 is Figure 2 the structural schematic diagram of the mixing tank in

[0025] Figure 4 isFigure 2 Structural schematic diagram of the medium homogenization tank.

[0026] Reference numerals:

[0027] 10. Pretreatment combination system for fermentation materials with different concentrations;

[0028] 100. Dry material pretreatment unit; 110. Mixing tank; 120. High-concentration material stirrer; 121. Stirring shaft; 122. Stirring blade; 130. Material feeding port; 140. Coarse grid; 150. Heating module; 151. Heating circulation pipeline;

[0029] 200. Wet material pretreatment unit; 210. Homogenization tank; 211. Sand settling hopper; 220. Vertical shaft stirrer; 221. Scraper; 230. Screw sand conveyor;

[0030] 300. Anaerobic fermentation unit;

[0031] 400. Biogas slurry reflux pipeline;

[0032] 500. Screw pump. Specific implementation manners

[0033] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0034] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.

[0036] The present utility model provides a combined system for pretreatment of fermentation materials with different concentrations.

[0037] In the embodiments of the present utility model, as Figures 1 to 4 shown, the combined system 10 for pretreatment of fermentation materials with different concentrations includes a dry material pretreatment unit 100, a wet material pretreatment unit 200, and an anaerobic fermentation unit 300. The dry material pretreatment unit 100 is suitable for mixing, heating, stirring, and pre-hydrolyzing high-concentration fiber materials and / or low-concentration materials; the wet material pretreatment unit 200 is arranged in communication with the dry material pretreatment unit 100, and the wet material pretreatment unit 200 is suitable for removing impurities and pre-heating wet materials; the anaerobic fermentation unit 300 is connected to the dry material pretreatment unit 100 and the wet material pretreatment unit 200, and the anaerobic fermentation unit 300 is used to receive the materials processed by the dry material pretreatment unit 100 and the materials processed by the wet material pretreatment unit 200 for anaerobic fermentation; the dry material pretreatment unit 100 includes a mixing tank 110 and a plurality of high-concentration material stirrers 120. The plurality of high-concentration material stirrers 120 are arranged side by side in the mixing tank 110. The high-concentration material stirrers 120 are arranged horizontally, and the plurality of high-concentration material stirrers 120 are adjacent to each other.

[0038] For the combined system 10 for pretreatment of fermentation materials with different concentrations provided by the present utility model, since the raw material solid content rates of the high-concentration fiber materials and the low-concentration materials are relatively high, in this application, a plurality of high-concentration material stirrers 120 are arranged in the mixing tank 110. The plurality of high-concentration material stirrers 120 are arranged horizontally side by side in the mixing tank 110, and the plurality of high-concentration material stirrers 120 are adjacent to each other, so as to fully mix the materials and microorganisms in the mixing tank 110, ensure that the stirring in the mixing tank 110 is uniform without dead corners, and effectively promote the exchange of substances and energy; and the high-concentration material stirrers 120 have a shell-breaking effect on the liquid surface and a disturbing effect on the bottom, ensuring the uniformity and stability of the materials and forming a material concentration gradient. In this way, the total solid concentration of fermentation applicable to the dry material pretreatment unit 100 is significantly increased, and the total solid concentration of fermentation is increased by up to 16%.

[0039] Refer to Figures 2 to 3, in one embodiment, the dry material pretreatment unit 100 includes a mixing tank 110, a set of coarse grids, a set of heating modules 150, a set of stirring modules, and a set of pipeline valves, electrical instruments, and controls.

[0040] Among them, the mixing tank 110 adopts a rectangular flat-bottom tank body with a tank body size of 16.5×5.5×5.3m, a top bottom cover plate, reserved maintenance holes, and an underground concrete structure; the coarse grids adopt stainless steel grids; the heating module 150 is in the form of heating plates, with a total area of 97㎡ and a heating target temperature of 25°C; the stirring module adopts high-concentration material stirrers 120, which are installed from the side of the tank body, with a total of four sets. One of the four high-concentration material stirrers 120 is arranged near the feeding port, and the remaining high-concentration material stirrers 120 are arranged parallel to each other in the middle of the mixing tank 110.

[0041] The high-concentration fiber material after being crushed is transported to the mixing tank 110 by a forklift. The low-concentration material is transported to the site by a vehicle and directly unloaded at the coarse grids of the mixing tank 110. The coarse grids are installed on the side of the top of the tank body for convenient material feeding. At the same time, the dry material pretreatment unit 100 is connected to the anaerobic fermentation unit 300 through the biogas slurry return pipeline 400, and the returned biogas slurry is used as the medium for adjusting the material concentration. Since the raw material solid content of the high-concentration fiber material and the low-concentration material is relatively high, high-concentration material stirrers 120 are set in the mixing tank 110, and holes and connecting flanges are reserved on the tank wall. The high-concentration material stirrers 120 are used to fully mix the materials and microorganisms in the mixing tank 110, ensure uniform stirring in the tank without dead corners, and effectively promote the exchange of substances and energy; stirring has a shell-breaking effect on the liquid surface and a disturbing effect on the bottom, ensuring the uniformity and stability of the materials. The heating plates are installed in the center of the tank body, welded to the embedded parts on one side of the tank wall, and the heating plates exchange heat between the mixing tank 110 and the external environment through the heating circulation pipeline 151. The heating plates heat up the materials, which is beneficial to the removal of impurities and reduces the impact of temperature on the anaerobic system. The materials that have been fully heated, mixed, and pre-hydrolyzed are sent to the anaerobic fermentation unit 300 for anaerobic fermentation through the pipeline connecting the screw pump 500 reserved in the tank body.

[0042] Refer to Figures 2 to 3 , specifically, the mixing tank 110 includes a first tank wall, a second tank wall, a third tank wall, and a fourth tank wall that are connected end to end in sequence. The high-concentration material stirrers 120 are connected between the second tank wall and the fourth tank wall, and multiple high-concentration material stirrers 120 are arranged parallel to each other between the first tank wall and the third tank wall. In this way, the installation of the high-concentration material stirrers 120 is provided by the second and fourth tank walls, and at the same time, multiple high-concentration material stirrers 120 are arranged parallel to each other between the first tank wall and the third tank wall to increase the stirring area of the high-concentration material stirrers 120 covering the mixing tank 110, thereby improving the stirring efficiency of the mixing tank 110.

[0043] Refer to Figures 2 to 3, in one embodiment, a material feeding port 130 is formed on one side close to the first pool wall above the mixing pool 110. A coarse grid 140 is arranged at the material feeding port 130, and at least one high-concentration material stirrer 120 is arranged below the material feeding port 130. In this way, by arranging at least one high-concentration material stirrer 120 below the material feeding port 130, the materials input from the material feeding port 130 can be quickly dispersed, and the dispersion and mixing uniformity of the materials in the mixing pool 110 can be improved.

[0044] Referring to Figure 2 , in one embodiment, the high-concentration material stirrer 120 includes a stirring shaft 121 and a plurality of stirring blades 122. The plurality of stirring blades 122 are symmetrically arranged in pairs on the stirring shaft 121. When two adjacent high-concentration material stirrers 120 rotate, the stirring blades 122 located in the same plane are staggered from each other. It can be understood that the stirring shaft 121 is used to drive the plurality of stirring blades 122 to rotate, so as to realize the stirring of the materials. When two adjacent high-concentration material stirrers 120 rotate, the stirring blades 122 located in the same plane are staggered from each other, which can reduce the accumulation of materials between two adjacent high-concentration material stirrers 120 and reduce the mutual influence between two adjacent high-concentration material stirrers 120, so as to improve the overall stirring efficiency.

[0045] Referring to Figure 2 and Figure 4 , the wet material pretreatment unit 200 includes a homogenizing pool 210, a set of coarse grids, a set of temperature increasing devices, a set of stirring modules, a set of screw sand conveyors 230, and a set of pipeline valves, electrical instruments and controls.

[0046] The homogenizing pool 210 adopts a circular pool body, and a sand settling cone hopper 211 is arranged at the bottom to ensure the rapid mixing of materials and the precipitation of impurities. The size of the homogenizing pool 210 is φ12.0×7.0m, of which the depth of the cone hopper is 3.0m, the top is provided with a cover plate, a maintenance hole is reserved, and it is an underground concrete structure; the coarse grid adopts a stainless steel grid; the temperature increasing device adopts a carbon steel coil with a diameter of 80mm, a total of 4 circles, and the heating target temperature is 20°C; the stirring module adopts a vertical stirrer with scrapers 221 at the top and bottom, which can remove floating scum and also collect the sediment at the bottom of the cone hopper; the screw sand conveyor 230 adopts a shaftless screw to stably output the sediment out of the pool.

[0047] After the wet materials (TS≤12%) are transported to the site by vehicle, they are unloaded into the homogenization tank 210. A coarse grid is set at the inlet of the homogenization tank 210, which can isolate large impurities. The coarse grid is installed on the side of the top of the tank body for convenient material feeding, and at the same time, the recycled biogas slurry is used as the medium for adjusting the material concentration. A conical hopper is set at the bottom of the homogenization tank 210, and a vertical shaft agitator 220 with a scraper 221 is set at the center of the tank body. An installation hole is reserved at the top of the tank. The scraper 221 of the vertical shaft agitator 220 pushes the bottom impurities into the conical hopper, and they are removed by the screw sand remover installed in the conical hopper on the side wall. At the same time, a temperature increasing device is set in the tank, which is beneficial to the removal of impurities and reducing the impact of temperature on the anaerobic system. After impurity removal and pre-temperature increase, the materials are transported to the anaerobic fermentation unit 300 through the pipeline reserved in the tank body and connected to the screw pump 500 for anaerobic fermentation.

[0048] The technology of this application can adapt to different concentrations of raw material compositions in pretreatment. It can adapt to both low-concentration fecal sewage raw materials with impurities (≤12%) and high-concentration fiber raw materials and mixed raw materials (about 16%). Compared with the conventional pretreatment process (raw material concentration ≤10%), the concentration increase is relatively obvious.

[0049] Because there are many uncertain factors in the collection of fermentation raw materials, which may cause the entire system to malfunction, and the actual types of raw materials processed may deviate from the design. The combined dry and wet material pretreatment process can solve the above problems. No matter what kind of dry, wet or combined materials, this pretreatment system can be used to ensure the stability of the operation of the backend anaerobic system.

[0050] The discharge ports of the dry material pretreatment system and the wet material pretreatment system are respectively connected to the screw pump 500, and one set of each is a standby pump. The discharge ports of the screw pumps 500 are all aggregated to the anaerobic fermentation unit 300, and at the same time, they are connected to the biogas slurry return pipeline 400. Through the design of pipelines and valves, the biogas slurry return pipeline 400 becomes the feed pipe of the pretreatment system; the materials of the wet material pretreatment unit 200 are pumped into the dry material pretreatment unit 100 through the screw pump 500 and the biogas slurry return pipeline 400 to achieve the concentration adjustment between high-concentration and low-concentration materials; it is also possible to reverse the materials of the dry material pretreatment unit 100 to the wet material pretreatment unit 200 for material dumping during the cleaning and maintenance of the tank body, and the process can achieve continuous production without stopping.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pretreatment combination system for fermentation materials with different concentrations, characterized in that, Comprising: A dry material pretreatment unit, which is applicable to mix, heat, stir and pre-hydrolyze high-concentration fiber materials and / or low-concentration materials; A wet material pretreatment unit, which is arranged in communication with the dry material pretreatment unit, and is applicable to remove impurities and pre-heat wet materials; An anaerobic fermentation unit, which is connected to the dry material pretreatment unit and the wet material pretreatment unit, and is used to receive the materials processed by the dry material pretreatment unit and the materials processed by the wet material pretreatment unit for anaerobic fermentation; Wherein, the dry material pretreatment unit includes a mixing tank and a plurality of high-concentration material agitators. The plurality of high-concentration material agitators are arranged side by side in the mixing tank. The high-concentration material agitators are arranged horizontally, and the plurality of high-concentration material agitators are adjacent to each other.

2. The pretreatment combined system for fermentation materials with different concentrations according to claim 1, wherein The mixing tank includes a first pool wall, a second pool wall, a third pool wall and a fourth pool wall connected end to end in sequence. The high-concentration material agitator is connected between the second pool wall and the fourth pool wall. The plurality of high-concentration material agitators are arranged parallel to each other between the first pool wall and the third pool wall.

3. The pretreatment combination system for fermentation materials with different concentrations according to claim 2, characterized in that A material feeding port is formed on one side of the mixing tank close to the first pool wall. The material feeding port is provided with a coarse grid, and at least one high-concentration material agitator is arranged below the material feeding port.

4. The pretreatment combined system for fermentation materials with different concentrations according to claim 3, wherein The high-concentration material agitator includes a stirring shaft and a plurality of stirring blades. The plurality of stirring blades are symmetrically arranged in pairs on the stirring shaft. When two adjacent high-concentration material agitators rotate, the stirring blades in the same plane are staggered from each other.

5. The pretreatment combined system for fermentation materials with different concentrations according to claim 4, characterized in that The number of the high-concentration material agitators is four. One of the four high-concentration material agitators is arranged close to the material feeding port, and the remaining high-concentration material agitators are arranged parallel to each other in the middle of the mixing tank.

6. The pretreatment combination system for fermentation materials with different concentrations according to claim 5, wherein The pretreatment combined system for fermentation materials with different concentrations further includes a biogas slurry reflux pipeline. The anaerobic fermentation unit refluxes biogas slurry to the dry material pretreatment unit or the wet material pretreatment unit through the biogas slurry reflux pipeline to adjust the total solid concentration of fermentation in the dry material pretreatment unit or the wet material pretreatment unit.

7. The pretreatment combined system for fermentation materials with different concentrations according to claim 6, characterized in that, The dry material pretreatment unit further includes a heating module. The heating module includes a heating plate and a heating circulation pipeline. The heating plate is arranged on the pool wall of the mixing tank, and the heating circulation pipeline is communicated with the heating plate.

8. The pretreatment combined system for fermentation materials with different concentrations according to any one of claims 1 to 7, characterized in that, The wet material pretreatment unit includes a homogenizing tank and a vertical shaft agitator. The vertical shaft agitator is arranged in the homogenizing tank, and the vertical shaft agitator is applicable to stir the wet materials in the homogenizing tank.

9. The pretreatment combined system for fermentation materials with different concentrations according to claim 8, wherein A sand settling cone hopper is arranged at the bottom of the homogenizing tank, and a scraper is arranged on the vertical shaft agitator corresponding to the position of the sand settling cone hopper.

10. The combined system for pretreatment of fermentation materials with different concentrations according to claim 8, wherein The wet material pretreatment unit further includes a screw sand conveyor, which is communicated with the bottom of the homogenizing tank, and the screw sand conveyor is applicable to discharge the sediment at the bottom of the homogenizing tank out of the homogenizing tank.

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