An ultra-high temperature aerobic fermentation system

Abstract

The utility model relates to a kind of ultra-high temperature aerobic fermentation systems, including fermentation bin, still including gas separation device and photobioreactor;The gas separation device with the fermentation bin is communicated, for sequentially carrying out component separation to waste gas produced by the fermentation bin fermentation;The photobioreactor with the gas separation device is communicated downstream along gas flow direction, photosynthetic microorganism is distributed in the photobioreactor, the photosynthetic microorganism can absorb carbon dioxide and ammonia separated by the gas separation device, and oxygen is generated;The photobioreactor is also communicated with the fermentation bin, to supply oxygen generated by the photosynthetic microorganism to the fermentation bin.Its beneficial effect is, the ultra-high temperature aerobic fermentation system of the utility model handles the ecological environmental protection of fermentation waste gas, reduces the emission of greenhouse gas, and energy consumption is low, while realizing the recycling of waste gas resources.

Description

Technical Field

[0001] This utility model relates to the field of fermentation technology, and in particular to an ultra-high temperature aerobic fermentation system. Background Technology

[0002] Ultra-high temperature aerobic fermentation is an advanced organic waste treatment technology that utilizes the activity of microorganisms under specific conditions (such as temperature, humidity, and oxygen supply) to accelerate the decomposition of organic matter. This fermentation method typically takes place in an environment with temperatures higher than traditional composting, often exceeding 80°C, hence the name "ultra-high temperature." The steam produced during fermentation is a mixture, mainly consisting of water vapor, ammonia, carbon dioxide, hydrogen sulfide, and volatile organic compounds (VOCs). Direct emission of this steam would pollute the environment and exacerbate the greenhouse effect.

[0003] For the waste gas generated during ultra-high temperature aerobic fermentation, the typical treatment process is "spray scrubbing + biological filtration." This involves neutralizing most of the ammonia or hydrogen sulfide in the waste gas through spraying with an acidic or alkaline solution, reducing the load on subsequent biological treatment. The remaining waste gas then enters a biofilter or trickling filter for microbial degradation. This approach has high initial equipment costs for the spray tower, circulating pumps, etc., and the spray section requires a large amount of circulating water, while the circulating pumps and fans consume significant energy. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an ultra-high temperature aerobic fermentation system, which solves the technical problem of improper waste gas treatment in existing ultra-high temperature aerobic fermentation systems, resulting in high energy consumption for waste gas treatment.

[0006] Technical solution

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] In a first aspect, this utility model provides an ultra-high temperature aerobic fermentation system, including a fermentation chamber, a gas separation device, and a photobioreactor;

[0009] The gas separation device is connected to the fermentation chamber and is used to sequentially separate the components of the waste gas generated during fermentation in the fermentation chamber.

[0010] The photobioreactor is connected downstream of the gas separation device along the gas flow direction. Photosynthetic microorganisms are distributed in the photobioreactor. The photosynthetic microorganisms can absorb carbon dioxide and ammonia separated by the gas separation device and produce oxygen.

[0011] The photobioreactor is also connected to the fermentation chamber to supply the fermentation chamber with oxygen produced by the photosynthetic microorganisms.

[0012] Optionally, in the ultra-high temperature aerobic fermentation system, the gas separation device includes, in sequence along the gas flow direction, a connected filter, an adsorption device, and a gas-water separator;

[0013] The filter is used to remove dust from the exhaust gas;

[0014] The adsorption device is used to remove hydrogen sulfide and volatile organic compounds from the waste gas;

[0015] The gas-liquid separator is provided with a first outlet, which is connected to the photobioreactor. The gas-liquid separator can separate carbon dioxide and ammonia, which are then introduced into the photobioreactor through the first outlet.

[0016] Optionally, the ultra-high temperature aerobic fermentation system further includes a heat exchanger;

[0017] The gas-liquid separator also includes a second outlet, which is connected to the heat exchanger;

[0018] The gas-water separator can also separate water vapor, which enters the heat exchanger through the second outlet for heat exchange, in order to recover the heat from the waste gas generated during fermentation in the fermentation chamber.

[0019] Optionally, in the ultra-high temperature aerobic fermentation system, the heat exchanger includes a heat exchange tube and an inlet and an outlet located at both ends of the heat exchange tube;

[0020] The fermentation chamber is equipped with auxiliary heating pipes on its side wall;

[0021] The outlet of the heat exchanger is connected to the inlet of the auxiliary heating tube, and the outlet of the auxiliary heating tube is connected to the inlet of the heat exchanger.

[0022] Optionally, in the ultra-high temperature aerobic fermentation system, the gas-liquid separator is a membrane separator equipped with a selectively permeable membrane.

[0023] Optionally, in the ultra-high temperature aerobic fermentation system, the photosynthetic microorganism is Chlorella;

[0024] The initial inoculation density of Chlorella is 1×10⁻⁶ per milliliter of culture medium. 6 -5×10 6 Each cell.

[0025] Optionally, the ultra-high temperature aerobic fermentation system further includes a blower;

[0026] The fermentation chamber is equipped with an aeration pipeline, and the blower is connected to both the aeration pipeline and the photobioreactor.

[0027] The oxygen produced by the photosynthetic microorganisms is sent into the fermentation chamber through the blower and the aeration pipeline.

[0028] Optionally, in the ultra-high temperature aerobic fermentation system, the filter is a bag filter and / or a cartridge filter;

[0029] The adsorption device contains activated carbon adsorption material in the cross section along the gas flow direction.

[0030] (III) Beneficial Effects

[0031] The beneficial effects of this invention are as follows: This ultra-high temperature aerobic fermentation system utilizes a separation device to separate the components of the waste gas generated during fermentation in the fermentation chamber. The separated carbon dioxide and ammonia are then fixed by a photobioreactor, which releases oxygen, which is then returned to the fermentation chamber to provide oxygen for aerobic fermentation, forming a closed loop. The photosynthesis involving carbon dioxide promotes the accumulation of carbon sources by organisms and simultaneously promotes the absorption of ammonia, reducing greenhouse gas emissions and nitrogen input to organisms. The oxygen produced by photosynthesis effectively increases the oxygen content in the fermentation chamber, reducing the frequency of aerobic aeration during fermentation and thus reducing aeration energy consumption. Compared to existing technologies, this ultra-high temperature aerobic fermentation system is environmentally friendly in its waste gas treatment method, reducing greenhouse gas emissions, consuming less energy, and simultaneously achieving the recycling of waste gas resources. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of Embodiment 1 of an ultra-high temperature aerobic fermentation system of this utility model.

[0033] [Explanation of Labels in the Attached Image]

[0034] 1: Fermentation chamber; 2: Gas separation device; 3: Filter; 4: Adsorption device; 5: Pipeline; 6: Gas-liquid separator; 8: Heat exchanger; 9: Liquid outlet; 11: Collection device; 12: Liquid inlet; 14: Photobioreactor; 16: Blower; 17: Aeration pipeline; 18: Fermentation material. Detailed Implementation

[0035] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0036] Example 1:

[0037] Reference Figure 1 This embodiment provides an ultra-high temperature aerobic fermentation system, specifically including a fermentation chamber 1, which is used to complete the ultra-high temperature aerobic fermentation process. It also includes a gas separation device 2 and a photobioreactor 14. The gas separation device 2 is connected to the fermentation chamber 1 and is used to sequentially separate the components of the waste gas generated during fermentation in the fermentation chamber 1. The photobioreactor 14 is connected downstream of the gas separation device 2 along the gas flow direction. Photosynthetic microorganisms are distributed in the photobioreactor 14, which can absorb the carbon dioxide and ammonia separated by the gas separation device 2 and produce oxygen. The photobioreactor 14 is also connected to the fermentation chamber 1 to supply the oxygen produced by the photosynthetic microorganisms to the fermentation chamber 1. The carbon dioxide and ammonia generated during ultra-high temperature aerobic fermentation are introduced into the photobioreactor 14, and the photobioreactor 14 releases oxygen, which is then returned to the fermentation chamber 1 to provide oxygen for aerobic fermentation, forming a closed loop. This method of treating fermentation waste gas is environmentally friendly, energy-efficient, and simultaneously achieves the recycling of waste gas resources.

[0038] Reference Figure 1 This embodiment provides an ultra-high temperature aerobic fermentation system. The gas separation device 2 includes, sequentially along the gas flow direction, a filter 3, an adsorption device 4, and a gas-liquid separator 6. The filter 3 is used to remove dust from the exhaust gas. The filter 3 is a bag filter 3 or a cartridge filter 3, or a combination of bag filter 3 and cartridge filter 3. Among them, the bag filter 3 usually uses filter bags as the filter medium, and the filter bags are installed on a support cage. When dust-laden gas or liquid passes through the filter bag, the particles are blocked on the outer surface of the filter bag to form a filter cake, and the purified airflow is discharged through the filter bag. The cartridge filter 3 uses a cylindrical filter element (filter cartridge), and the inside of the filter cartridge is usually a pleated filter material, which can increase the filtration area. The dust-laden gas or liquid flows from the outside to the inside, and the particles are captured on the outside of the filter cartridge. When the bag filter 3 and the cartridge filter 3 are used in combination, the bag filter 3 is set upstream of the gas flow direction, and the cartridge filter 3 is set after the bag filter 3, so that the exhaust gas is filtered twice to ensure the filtration effect.

[0039] Adsorption device 4 is used to remove hydrogen sulfide and volatile organic compounds (VOCs) from waste gas. Activated carbon adsorption material is installed inside the adsorption device 4 along the gas flow cross-section. The activated carbon adsorption material adsorbs hydrogen sulfide and VOCs, and can be replaced periodically. Activated carbon, as a porous material, has broad adsorption properties and can effectively remove various pollutants from waste gas, including hydrogen sulfide and VOCs. However, its adsorption capacity for carbon dioxide and ammonia is relatively weak; therefore, carbon dioxide and ammonia are separated from hydrogen sulfide and VOCs.

[0040] The gas-liquid separator 6 is primarily designed to separate moisture from carbon dioxide and ammonia in waste gas. Specifically, the gas-liquid separator 6 is equipped with a selectively permeable membrane separator, where the membrane material allows water vapor to pass through while other gases (such as carbon dioxide and ammonia) are less likely to pass through, thus separating moisture from carbon dioxide and ammonia. The gas-liquid separator 6 has a first outlet, which is connected to the photobioreactor 14. The gas-liquid separator 6 can separate carbon dioxide and ammonia, which are then introduced into the photobioreactor 14 through the first outlet. Simultaneously, the photosynthesis involving carbon dioxide can promote the absorption of ammonia by organisms.

[0041] The filter 3, adsorption device 4, and gas-liquid separator 6 are arranged sequentially. Through the cooperation of these simple devices, the components of the waste gas are separated. Compared to treating waste gas using acidic or alkaline solutions through spraying, this solution has a simpler structure and lower energy consumption. The filter 3, adsorption device 4, and gas-liquid separator 6 are all interconnected via pipelines. For details regarding the working structure of the filter 3, adsorption device 4, and gas-liquid separator 6, please refer to existing technologies.

[0042] Reference Figure 1 This embodiment provides an ultra-high temperature aerobic fermentation system, which also includes a heat exchanger 8 and a gas-liquid separator 6. The second outlet is connected to the heat exchange channel of the heat exchanger 8, which is formed by heat exchange tubes. The heat exchange tubes between the inlet 12 and outlet 9 of the heat exchanger 8 are used to transport the heat exchange medium, such as water. The gas-liquid separator 6 separates water vapor through a selectively permeable membrane. The water vapor enters the heat exchange channel of the heat exchanger 8 through the second outlet of the gas-liquid separator 6 for heat exchange, recovering the heat from the high-temperature water vapor generated during ultra-high temperature aerobic fermentation. A collection device 11 is provided at one end of the heat exchange channel. After heat exchange, the water vapor condenses into condensate in the heat exchange channel. The condensate flows through the heat exchange channel to the collection device 11 for collection. The collected condensate can be used in the fermentation process.

[0043] Specifically, the heat exchanger 8 includes an inlet 12 and an outlet 9. A pipe between the inlet 12 and the outlet 9 is used to transport the heat exchange medium. An auxiliary heating pipe is installed on the inner side wall of the fermentation chamber 1. The outlet 9 of the heat exchanger 8 is connected to the inlet of the auxiliary heating pipe, and the outlet of the auxiliary heating pipe is connected to the inlet 12 of the heat exchanger 8, so as to circulate the recovered heat to heat the material in the fermentation chamber 1. The flow direction of the heat exchange medium is opposite to the flow direction of the water vapor, which can improve the heat exchange efficiency.

[0044] In addition, the heat exchanger 8 is equipped with a three-way valve at the inlet 12 and the outlet 9. If heating is not required in the fermentation chamber 1, the heat exchange medium can be guided to other scenarios that require heating through an additional pipeline 5. For example, it can be used to help maintain the temperature in the photobioreactor 14.

[0045] In addition, for ultra-high temperature aerobic fermentation, the heat contained in its fermentation steam is recovered and utilized, which reduces the energy consumption of the ultra-high temperature aerobic fermentation system and avoids heat waste.

[0046] Reference Figure 1 This embodiment provides an ultra-high temperature aerobic fermentation system, wherein the photosynthetic microorganism is Chlorella. The initial inoculation density of Chlorella is 1×10⁻⁶ per milliliter of culture medium. 6 -5×10 6 This initial inoculation density allows for the rapid establishment of sufficient biomass to begin effectively absorbing carbon dioxide and ammonia, while providing adequate buffering capacity to cope with changes in gas production rates during fermentation; it also avoids light limitation or oxygen accumulation problems caused by excessively high cell density, which would inhibit the growth of Chlorella.

[0047] It should be noted that the carbon dioxide and ammonia separated from the exhaust gas are introduced into the culture medium of Chlorella and absorbed and utilized by Chlorella. The oxygen produced by Chlorella floats to the surface of the culture medium and is collected and utilized. It is understandable that the collected gas will contain a small amount of unabsorbed carbon dioxide and ammonia, but this will not affect the aeration of fermentation chamber 1.

[0048] Reference Figure 1 This embodiment provides an ultra-high temperature aerobic fermentation system, which also includes a blower 16. The fermentation chamber 1 is equipped with an aeration pipe 175, and the blower 16 is connected to both the aeration pipe 175 and the photobioreactor 14. Oxygen produced by photosynthetic microorganisms is delivered into the fermentation chamber 1 through the blower 16 and the aeration pipe 175. The blower 16, used for aeration in the aerobic fermentation system, directly delivers the oxygen produced by the photosynthetic microorganisms into the fermentation chamber 1, eliminating the need for additional system equipment. Furthermore, the oxygen produced by the photosynthetic microorganisms increases the oxygen content during aeration, which can reduce the number of aeration cycles to some extent, thereby reducing aeration energy consumption.

[0049] Under identical initial moisture content, temperature, and ventilation intensity, a composting experiment was conducted using fermentation chamber 1 operating alone as a comparison, along with the ultra-high temperature aerobic fermentation system proposed in this embodiment for one cycle. With heat recovery, the maximum temperature of the compost pile using the ultra-high temperature aerobic fermentation system proposed in this embodiment was approximately 10°C lower than that of fermentation chamber 1 operating alone, but the high-temperature period was longer. In fermentation chamber 1 with heat recovery, the lower temperature during the thermophilic phase did not reduce the amount of carbon dioxide in the exhaust gas; on the contrary, carbon dioxide emissions were higher and more concentrated. These phenomena indicate that heat recovery not only did not affect the fermentation process but also enabled thermophilic microorganisms to maintain high activity.

[0050] Taking a 20-foot standard container (fermentation chamber 1) as an example, it can hold approximately 8 tons of fermentation raw materials. In the initial stage, the fermentation material 18 pile in fermentation chamber 1 has a C:N ratio of 25:1 and a moisture content of 55%-65%. During the one-week ultra-high temperature aerobic composting cycle, when the pile temperature reaches 80℃, the water pump and steam pipe valves of heat exchanger 8 are opened to begin heat recovery. During the 60-hour recovery period, the temperature of the tap water (heat exchange medium) rises from 20℃ to 50℃, with an average water flow rate of 0.64 m³ / h. A total of 4840 MJ of heat is recovered, producing 30 tons of hot water. The recovered heat accounts for 60% of the steam heat, equivalent to a recoverable calorific value of 360 kJ-1000 kJ per kilogram of organic matter. A single module with a volume of 2 m³ / h is configured. 3 The system comprises 146 photobioreactors. Fermentation waste gas (CO2, NH3) is introduced into photobioreactor 14. Chlorella fixes carbon and nitrogen through photosynthesis, simultaneously releasing oxygen which is then returned to the fermentation system. The temperature in the photobioreactor is 25℃±3℃, with a light-dark ratio of 18h:6h. Based on a microalgae (Chlorella) yield of 0.8g / L / day, an annual microalgae powder production of 2640kg, an average microalgae carbon content of 45% (dry weight), an annual carbon fixation of 1188kg, an annual carbon dioxide consumption of 4356kg, and an annual oxygen release of 3168kg, processing 1 ton of fermentation material can reduce carbon dioxide emissions by 50-80kg. Aeration power is reduced from 0.8-1.2kWh / m3 in traditional fermentation systems to 0.3-0.5kWh / m3. The entire system's waste gas treatment method is energy-saving and environmentally friendly, suitable for widespread application.

[0051] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0053] In this 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 indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "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.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-temperature aerobic fermentation system, comprising a fermentation chamber (1), characterized in that, It also includes a gas separation device (2) and a photobioreactor (14); The gas separation device (2) is connected to the fermentation chamber (1) and is used to sequentially separate the components of the waste gas generated by the fermentation in the fermentation chamber (1). The photobioreactor (14) is connected downstream of the gas separation device (2) along the gas flow direction. Photosynthetic microorganisms are distributed in the photobioreactor (14). The photosynthetic microorganisms can absorb the carbon dioxide and ammonia separated by the gas separation device (2) and produce oxygen. The photobioreactor (14) is also connected to the fermentation chamber (1) to supply the fermentation chamber (1) with oxygen produced by the photosynthetic microorganisms.

2. The ultra-high temperature aerobic fermentation system as described in claim 1, characterized in that, The gas separation device (2) includes, in sequence along the gas flow direction, a connected filter (3), an adsorption device (4), and a gas-water separator (6); The filter (3) is used to remove dust from the exhaust gas; The adsorption device (4) is used to remove hydrogen sulfide and volatile organic compounds from the waste gas; The gas-water separator (6) is provided with a first outlet, which is connected to the photobioreactor (14). The gas-water separator (6) can separate carbon dioxide and ammonia, which are introduced into the photobioreactor (14) through the first outlet.

3. The ultra-high temperature aerobic fermentation system as described in claim 2, characterized in that, It also includes heat exchangers (8); The gas-water separator (6) also includes a second outlet, which is connected to the heat exchanger (8); The gas-water separator (6) can also separate water vapor, which enters the heat exchanger (8) through the second outlet for heat exchange, so as to recover the heat in the waste gas generated by the fermentation in the fermentation chamber (1).

4. The ultra-high temperature aerobic fermentation system as described in claim 3, characterized in that, The heat exchanger (8) includes a heat exchange tube and an inlet (12) and an outlet (9) located at both ends of the heat exchange tube; The fermentation chamber (1) is equipped with auxiliary heating pipes on its side wall; The outlet (9) of the heat exchanger (8) is connected to the inlet of the auxiliary heating tube, and the outlet of the auxiliary heating tube is connected to the inlet (12) of the heat exchanger (8).

5. The ultra-high temperature aerobic fermentation system as described in claim 3, characterized in that, The gas-water separator (6) is a membrane separator equipped with a selectively permeable membrane.

6. The ultra-high temperature aerobic fermentation system as described in claim 1, characterized in that, The photosynthetic microorganism is Chlorella; The initial inoculation density of Chlorella was 1×10⁻⁶ per milliliter of culture medium. 6 -5×10 6 Each cell.

7. The ultra-high temperature aerobic fermentation system as described in claim 6, characterized in that, It also includes blowers (16); The fermentation chamber (1) is equipped with an aeration pipeline (17), and the blower (16) is connected to both the aeration pipeline (17) and the photobioreactor (14). The oxygen produced by the photosynthetic microorganisms is sent into the fermentation chamber (1) through the blower (16) and the aeration pipe (17).

8. The ultra-high temperature aerobic fermentation system as described in claim 2, characterized in that, The filter (3) is a bag filter and / or a cartridge filter; The adsorption device (4) has activated carbon adsorption material inside the cross section in the direction of gas flow.

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