A tank fermentation system for lignite fermentation

Abstract

This application discloses a trough fermentation system for lignite fermentation, including a fermentation trough and a heating device for heating the fermentation trough. A floor heating coil is installed at the bottom of the fermentation trough. The heating device supplies heat to the fermentation trough through the floor heating coil, providing different amounts of heat to the fermentation trough in the early, middle, and late stages of fermentation, respectively, so that the fermentation trough is in the first, second, and third stages. The gradient temperature control of this application can accurately meet the temperature requirements of different stages in the fermentation process, significantly improving fermentation efficiency, accelerating the fermentation process, significantly shortening the fermentation cycle, and reducing greenhouse gas emissions, thus offering environmental advantages.

Description

Technical Field

[0001] This application relates to the field of lignite fermentation technology, specifically to a trough fermentation system for lignite fermentation. Background Technology

[0002] In the extraction of humic acid from lignite, traditional methods mainly rely on strong alkali and high-temperature processes, such as boiling with KOH. While this method can achieve the extraction of humic acid, it has significant drawbacks:

[0003] (1) High energy consumption: Because it needs to be carried out under high temperature conditions, the energy consumption is large, which does not conform to the principle of sustainable development.

[0004] (2) High pollution: The use of strong alkali will generate a large amount of harmful waste liquid, causing serious pollution to the environment and requiring additional treatment steps.

[0005] (3) Low product activity: Strong alkali treatment may destroy the structure of humic acid, reducing its biological activity and application value.

[0006] Another method is bio-fermentation, which uses microorganisms to transform lignite to extract humic acid. While this biological method is relatively environmentally friendly, it also has its inherent challenges:

[0007] (1) Long fermentation cycle: It usually takes 30 to 60 days, which greatly prolongs the production cycle and reduces production efficiency.

[0008] (2) Uneven temperature control: The bio-fermentation process is sensitive to temperature. Inconsistent temperature control may affect the growth and metabolism of the microbial community, thereby reducing the yield and quality of humic acid. Utility Model Content

[0009] Therefore, this application provides a trough fermentation system for lignite fermentation to solve the problems of low efficiency, high pollution, and unstable product quality in the prior art.

[0010] To achieve the above objectives, this application provides the following technical solution:

[0011] A trough-type fermentation system for lignite fermentation includes a fermentation trough and a heating device for heating the fermentation trough. The bottom of the fermentation trough is equipped with a floor heating coil. The heating device supplies heat to the fermentation trough through the floor heating coil, providing different amounts of heat to the fermentation trough in the early, middle and late stages of fermentation, so that the fermentation trough is in the first stage, the second stage and the third stage respectively.

[0012] Optionally, the heating device uses graphene heating.

[0013] Optionally, the heating device is equipped with a control switch, which is used to adjust the heating flow rate at different stages of fermentation.

[0014] Optionally, the fermentation tank is equipped with a spray pipe for spraying KOH solution, and the control switch is electrically connected to the spray pipe to shut off the heating device after the spray pipe finishes working.

[0015] Optionally, the temperature of the fermentation tank is 45-55℃ in the first stage, 60-100℃ in the second stage, and 5-100℃ in the third stage.

[0016] Optionally, the fermentation tank is equipped with a turning machine for stirring and turning the fermentation materials.

[0017] Optionally, multiple fermentation tanks are arranged side by side.

[0018] Optionally, the rear of the fermentation tank is provided with a transverse moving track, and a transfer vehicle is provided on the moving track. The transfer vehicle is used to transport the turning machine from one fermentation tank to another.

[0019] Optionally, an aeration tank is provided at the bottom of the fermentation tank.

[0020] Optionally, the fermentation tank is provided with an exhaust port for discharging the gas generated during the fermentation process.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] 1. Gradient temperature control can precisely meet the temperature requirements of different stages in the fermentation process: the high temperature environment in the early stage is conducive to the rapid proliferation of microorganisms, the moderate temperature in the middle stage helps to maintain enzyme activity, and the low temperature environment in the later stage is conducive to the maturation of materials.

[0023] This gradient temperature control method not only significantly improves fermentation efficiency, making the fermentation process more efficient, but also better promotes the metabolic activities of microorganisms, thereby increasing the yield and quality of fermentation products such as humic acid. By optimizing the temperature distribution, it accelerates the fermentation process and significantly shortens the fermentation cycle. Moreover, it reduces greenhouse gas emissions and improves resource utilization, thus having an environmentally friendly effect.

[0024] 2. Graphene has high thermal conductivity and energy-saving properties. Therefore, using graphene heating as a heating device can quickly and evenly transfer heat to the fermentation tank while reducing heat loss.

[0025] 3. Underfloor heating coils can achieve uniform heat distribution, accurately meeting the temperature requirements of the fermentation tank at different stages, thereby improving fermentation efficiency and product quality. At the same time, the efficient heat conduction and energy-saving characteristics of underfloor heating coils can reduce energy consumption, operating costs, and greenhouse gas emissions. In addition, its stable temperature control helps extend equipment life, reduce maintenance costs, and is easy to operate and highly safe, thus improving the overall environmental performance and economic benefits of the fermentation system. Attached Figure Description

[0026] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0027] Figure 1 This application provides an overall structural schematic diagram of a trough fermentation system for lignite fermentation, as shown in the embodiments of the present application.

[0028] Figure 2 A schematic diagram of a trough fermentation system for lignite fermentation provided in this application embodiment;

[0029] Figure 3 for Figure 2 Cross-sectional view of the fermentation tank.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Fermentation tank; 2. Aeration tank; 3. Turning machine; 4. Moving track; 5. Transfer vehicle; 6. Limiting track. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0034] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0035] A trough fermentation system for lignite fermentation, referring to Figures 1-3 It includes multiple fermentation tanks 1 arranged side by side, each of which is covered with a lid to keep warm and moist.

[0036] First, it is necessary to screen for heat-resistant lignin-degrading strains (such as white-rot fungus *Trametes versicolor*) and lignite-degrading functional bacteria (such as *Bacillus subtilis*), and obtain highly efficient degrading bacterial communities through gradient lignite domestication culture.

[0037] Secondly, the fermentation system includes a heating device for heating the fermentation tank 1. In this embodiment, a floor heating coil is installed at the bottom of each fermentation tank 1, and the floor heating coil is connected to the heating device to precisely meet the temperature requirements of the fermentation tank 1 at different stages: the heating device supplies heat to the fermentation tank 1 through the floor heating coil, providing different amounts of heat to the fermentation tank 1 in the early, middle, and late stages of fermentation, so that the fermentation tank 1 is in the first, second, and third stages, respectively. The heating device adopts a graphene heating system, which supplies heat to the fermentation tank 1 above it through the floor heating coil when the temperature is low, ensuring the working temperature required for fermentation. It has advantages such as rapid heating, high thermal efficiency, large radiation, energy saving, and environmental protection.

[0038] Because the temperature of the underfloor heating coils is stable, the entire fermentation tank 1 maintains a relatively stable temperature from beginning to end. Therefore, using underfloor heating coils can effectively meet the temperature variation requirements during the fermentation of lignite bacteria. At the same time, it can also save energy because graphene has thermal radiation properties, which can directly radiate to the surface of the material, resulting in high efficiency in heat transfer without the loss of intermediate media.

[0039] Specifically, the heating device is equipped with a control switch to adjust the heat flow rate at different stages of fermentation. Due to fermentation requirements, a spray pipe can also be installed on each fermentation tank 1 to spray KOH solution onto the material during the middle stage of fermentation. The control switch is electrically connected to the spray pipe and is used to shut off the heating device after the spray pipe has finished its operation.

[0040] Specifically, in the early stage of fermentation, fermentation tank 1 is in the first stage under the heating of the heating device, with a temperature of 45-55℃, which promotes the proliferation of microorganisms. In the middle stage of fermentation, KOH solution is sprayed into the material through a spray pipe, causing the material temperature to rise. At this time, fermentation tank 1 is in the second stage, with a temperature of 60-100℃, which maintains enzyme activity. After spraying, the heating device is turned off by the control switch, and the temperature in fermentation tank 1 gradually decreases to room temperature. At this time, fermentation tank 1 is in the third stage, with a temperature of 5-100℃, which is room temperature ripening. This gradient temperature control method can effectively increase the humic acid yield to over 25%.

[0041] The concentration of the KOH solution is 6-8% w / v. By utilizing the acid-producing environment of fermentation, humic acid-K+ is chelated in its original form, avoiding the need for subsequent neutralization processes, and the water solubility of the product can be increased by 30%.

[0042] Each fermentation tank 1 has an aeration tank 2 located at the bottom center along the central axis. An aeration pipe with aeration holes can be installed in the aeration tank 2. A blower is installed outside the fermentation tank 1 to pressurize the aeration pipe and thus send air into the fermentation tank 1 through the aeration holes to provide the oxygen required for fermentation.

[0043] Correspondingly, a large amount of gas will be generated during the fermentation process. Carbon dioxide gas can be discharged by setting an exhaust port in fermentation tank 1.

[0044] Each fermentation tank 1 is equipped with a limiting track 6 for the turning machine 3 to travel on. The turning machine 3 travels on the top of the fermentation tank 1 during the middle and late stages of fermentation, mixing and turning the material along the length of the fermentation tank 1 to improve the heat dissipation and ventilation effect. On the other hand, it can control the shape of the pile to obtain better air permeability and ventilation.

[0045] At the tail end of all fermentation tanks 1, there is a horizontally arranged and connected moving track 4. The moving track 4 is equipped with a transfer vehicle 5, which can be used to install the turning machine 3. Therefore, the turning machine 3 can be transported from one fermentation tank 1 to another fermentation tank 1 to achieve continuous operation.

[0046] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A trough fermentation system for lignite fermentation, characterized in that: The fermentation tank (1) includes a fermentation tank (1) and a heating device for supplying heat to the fermentation tank (1). The fermentation tank (1) is equipped with a floor heating coil at the bottom. The heating device supplies heat to the fermentation tank (1) through the floor heating coil, and provides different amounts of heat to the fermentation tank (1) in the early, middle and late stages of fermentation, so that the fermentation tank (1) is in the first stage, the second stage and the third stage respectively. The heating device uses graphene heating; the heating device is equipped with a control switch, which is used to adjust the heating flow rate at different stages of fermentation; the fermentation tank (1) is equipped with a spray pipe for spraying KOH solution, and the control switch is electrically connected to the spray pipe to shut off the heating device after the spray pipe finishes working.

2. The trough fermentation system for lignite fermentation according to claim 1, characterized in that: The fermentation tank (1) is equipped with a turning machine (3) for stirring and turning the fermentation materials.

3. The trough fermentation system for lignite fermentation according to claim 2, characterized in that: Multiple fermentation tanks (1) are arranged side by side.

4. The trough fermentation system for lignite fermentation according to claim 3, characterized in that: The rear end of the fermentation tank (1) is provided with a transverse moving track (4), and a transfer vehicle (5) is provided on the moving track (4). The transfer vehicle (5) is used to transport the turning machine (3) from one fermentation tank (1) to another fermentation tank (1).

5. The trough fermentation system for lignite fermentation according to claim 1, characterized in that: An aeration tank (2) is provided at the bottom of the fermentation tank (1).

6. The trough fermentation system for lignite fermentation according to claim 1, characterized in that: The fermentation tank (1) is provided with an exhaust port, which is used to discharge the gas generated during the fermentation process.

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