CN110964625A - Wet anaerobic fermentation stirring and heat exchange method and wet anaerobic fermentation system - Google Patents
Wet anaerobic fermentation stirring and heat exchange method and wet anaerobic fermentation system Download PDFInfo
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- 238000003756 stirring Methods 0.000 title claims abstract description 28
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- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
- C12M27/18—Flow directing inserts
- C12M27/20—Baffles; Ribs; Ribbons; Auger vanes
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/06—Nozzles; Sprayers; Spargers; Diffusers
- C12M29/08—Air lift
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/14—Pressurized fluid
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/18—External loop; Means for reintroduction of fermented biomass or liquid percolate
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/24—Recirculation of gas
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- C12M33/00—Means for introduction, transport, positioning, extraction, harvesting, peeling or sampling of biological material in or from the apparatus
- C12M33/22—Settling tanks; Sedimentation by gravity
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- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
- C12M41/18—Heat exchange systems, e.g. heat jackets or outer envelopes
- C12M41/24—Heat exchange systems, e.g. heat jackets or outer envelopes inside the vessel
Abstract
The invention relates to a wet anaerobic fermentation system, which comprises an anaerobic fermentation tank, a circulating pump and a booster pump, wherein a vertical sleeve provided with a flow channel is arranged in the anaerobic fermentation tank, and the anaerobic fermentation tank is provided with a liquid outlet, a methane outlet, an upper liquid inlet and a lower liquid inlet; the liquid in the anaerobic fermentation tank flows out through a circulating pump and then flows back to the anaerobic fermentation tank for primary stirring; pressurizing the biogas in the anaerobic fermentation tank by a booster pump, and inputting the pressurized biogas into a vertical sleeve positioned in the anaerobic fermentation tank to enable liquid in the vertical sleeve to flow upwards and external liquid to flow downwards for secondary stirring; and (3) exchanging heat of the liquid in the anaerobic fermentation tank by flowing the heat exchange medium through the flow channel. The anaerobic fermentation tank has the advantages of high degradation efficiency and capability of resisting the degradation efficiency of environmental temperature, and solves the problems of low anaerobic degradation efficiency and large influence of the environmental temperature on the degradation efficiency when the conventional anaerobic fermentation tank is used for carrying out anaerobic degradation.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a wet anaerobic fermentation stirring and heat exchange method and a wet anaerobic fermentation system.
Background
The garbage disposal mode comprises the following steps: and (4) classifying and recycling.
Burying: the landfill treatment needs a large amount of land. Meanwhile, harmful ingredients in the garbage can cause serious pollution to the atmosphere, soil and water sources, so that the ecological environment is damaged, and the human health is seriously harmed.
Composting: the compost treatment is used for sorting and classifying the garbage, and the organic content of the garbage is required to be higher. Moreover, the composting treatment cannot be reduced, and a large amount of land still needs to be occupied.
And (3) incineration: the essence of incineration is to oxidize the organic waste into inert gases and inorganic incombustibles at high temperature and under sufficient oxygen supply to form a stable solid residue. Firstly, the garbage is put into an incinerator for combustion, heat energy is released, and then waste heat is recovered to supply heat or generate electricity. The flue gas is discharged after being purified, and a small amount of residual residues are discharged, buried or used for other purposes. Its advantages are high volume-reducing power, thorough high-temp harmlessness, less possessed ground area, less influence to ambient environment and recovery of heat energy. Therefore, incineration of garbage is an effective treatment method for harmlessness, reduction and recycling.
With the increasing of the environmental protection requirement in recent years, the classification of garbage is gradually promoted, the comprehensive treatment and utilization of perishable garbage is no longer limited to landfill and incineration technology treatment, and the treatment of perishable garbage by wet anaerobic fermentation technology becomes the mainstream technology. The existing wet anaerobic fermentation is performed in an anaerobic fermentation tank in a static mode, and has the defects of low anaerobic degradation efficiency and large influence of the degradation efficiency by the environmental temperature.
Disclosure of Invention
The invention aims to provide a wet anaerobic fermentation system and a wet anaerobic fermentation stirring and heat exchange method which have high degradation efficiency and can resist the influence of environmental temperature on the degradation efficiency, and solves the problems of low anaerobic degradation efficiency and large influence of the environmental temperature on the degradation efficiency when the existing anaerobic fermentation tank is used for carrying out anaerobic degradation.
The technical problem is solved by the following technical scheme: the utility model provides a wet-type anaerobic fermentation system, includes anaerobic fermentation jar, circulating pump and booster pump, anaerobic fermentation jar's top is equipped with the marsh gas export, be equipped with perpendicular sleeve in the anaerobic fermentation jar, it is heat conduction structure to erect the sleeve, erect and be equipped with the runner in the sleeve, anaerobic fermentation jar is equipped with the liquid outlet, the upper end of anaerobic fermentation jar's lateral wall is equipped with liquid inlet, the lower extreme is equipped with down liquid inlet, the import of circulating pump with liquid outlet links together, go up liquid inlet and lower liquid inlet parallel connection in the export of circulating pump, the exit linkage of booster pump wears to establish erect the outlet duct in the sleeve, the import of booster pump with marsh gas outlet links together, the runner is connected with and stretches out anaerobic fermentation jar's heat transfer medium advances pipe and heat transfer medium exit tube. When the anaerobic fermentation tank is used, liquid in the anaerobic fermentation tank flows out from the liquid flow outlet through the circulating pump and then flows back into the anaerobic fermentation tank from the upper liquid inlet and the lower liquid inlet to form liquid circulation, and the liquid in the anaerobic fermentation tank flows in the horizontal direction through the circulation to perform a stirring action in one direction; biogas in the anaerobic fermentation tank is pressurized from a biogas outlet output handle through a booster pump and then is input into liquid in a vertical sleeve in the anaerobic fermentation tank through an air outlet pipe, the biogas input into the vertical sleeve is upwards emitted from the liquid in the vertical sleeve so as to drive the liquid in the vertical sleeve to upwards flow, the liquid in the vertical sleeve upwards flows to drive the liquid outside the vertical sleeve to downwards flow, and secondary stirring in the other direction of the liquid in the anaerobic fermentation tank is realized; thereby playing a role in improving the anaerobic degradation efficiency. The stirring mode carries out hydraulic drive and pneumatic drive in a closed circulation mode, and does not change the gas content in the anaerobic fermentation tank, so that the anaerobic degradation efficiency cannot be changed due to the change of the gas content. During secondary stirring, because the mixing density of gas-liquid phases is lower than that of materials outside the sleeve, according to the pressure difference between the inside and the outside of the vertical sleeve caused by the difference of the densities between the two phases, the airflow drives the materials in the vertical sleeve to vertically flow upwards in the vertical sleeve, and the liquid outside the vertical sleeve flows downwards between the periphery of the sleeve and the pipe wall of the anaerobic fermentation tank, so that the strong vertical mixing flow of the materials in the fermentation tank is driven, and the vertical stirring effect of internal circulation is achieved. The heat exchange medium flows out from the heat exchange medium outlet pipe after being input into the flow channel of the vertical sleeve through the heat exchange medium inlet pipe, and the heat exchange medium generates heat exchange with liquid in the anaerobic fermentation tank when flowing through the flow channel of the vertical sleeve, so that the liquid in the anaerobic fermentation tank is heated or cooled. The heat exchanger in the tank is formed for indirect heat exchange, and hot water or cold water is selected to enter a flow passage to heat the material in the anaerobic fermentation tank or cool the material according to the temperature conditions of regions, seasons and the material entering the tank and the temperature requirement of the anaerobic degradation process. Thereby playing a role in resisting the influence of temperature on the anaerobic degradation efficiency.
Preferably, the anaerobic fermentation tank is cylindrical, the opening direction line of the upper liquid inlet is tangent to a cylinder taking the axis of the anaerobic fermentation tank as an axis, and the opening direction line of the lower liquid inlet is tangent to a cylinder taking the axis of the anaerobic fermentation tank as an axis. When this technical scheme makes once stirring, the flow of the liquid that produces is horizontal whirl, and the circulation of the material in the fermentation cylinder makes the interior material of jar be in horizontal full mixed flow state all the time. The effect of promoting degradation efficiency by stirring is good.
Preferably, the rotational direction of the rotational flow generated in the anaerobic fermentation tank by the liquid entering from the upper liquid inlet is opposite to the rotational direction of the rotational flow generated in the anaerobic fermentation tank by the liquid entering from the lower liquid inlet. The effect of primary stirring can be further improved.
Preferably, the lower part of the anaerobic fermentation tank is provided with a shielding plate which shields the upper part of the lower liquid inlet. The interference of the vertical backflow to the horizontal backflow below can be prevented.
Preferably, the shielding plate is inclined in a state where one end connected to the anaerobic fermentation tank is higher and the other end is lower. The interference of the shielding plate on the vertical backflow can be reduced.
Preferably, the lower end of the shielding plate is located right below the vertical sleeve. The interference of the shielding plate on the vertical backflow can be further reduced.
Preferably, the liquid outlet is located below the lower liquid inlet, and the bottom of the anaerobic fermentation tank is provided with a sludge retention bowl lower than the liquid inlet. Enough bacteria can be left in the anaerobic fermentation tank. Thereby ensuring the anaerobic fermentation effect.
Preferably, the inlet end of the circulation pump is connected to the liquid outlet through a desander. The amount of sand setting participating in horizontal backflow stirring can be reduced, so that the anaerobic fermentation effect is improved.
A wet anaerobic fermentation stirring and heat exchange method is characterized in that liquid in an anaerobic fermentation tank flows out through a circulating pump and then flows back to the liquid in the anaerobic fermentation tank in a direction tangential to a cylinder taking the axis of the anaerobic fermentation tank as an axis to drive the liquid in the anaerobic fermentation tank to generate rotational flow rotating in the horizontal direction so as to carry out primary stirring; pressurizing biogas in the anaerobic fermentation tank by a booster pump, inputting the pressurized biogas into liquid in a vertical sleeve in the anaerobic fermentation tank, enabling the biogas input into the vertical sleeve to upwards emerge from the liquid in the vertical sleeve so as to drive the liquid in the vertical sleeve to upwards flow, and enabling the liquid outside the vertical sleeve to downwards flow due to the upwards flow of the liquid in the vertical sleeve so as to realize secondary stirring of the liquid in the anaerobic fermentation tank; the heat exchange medium flows out from the heat exchange medium outlet pipe after being input into the flow channel of the vertical sleeve through the heat exchange medium inlet pipe, and the heat exchange medium generates heat exchange with liquid in the anaerobic fermentation tank when flowing through the flow channel of the vertical sleeve, so that the liquid in the anaerobic fermentation tank is heated or cooled.
The invention has the following advantages: the invention realizes the complete mixing flow of the materials in the anaerobic fermentation tank in the transverse and longitudinal (vertical) directions, can achieve the vertical upward flow in the vertical sleeve of the fermentation tank and the vertical downward flow outside the sleeve, and simultaneously prevents the crusting condition of the material surface in the fermentation process from occurring due to the surface stirring caused by the radial violent flow of the material upper surface in the tank from the center of the tank to the peripheral surface, and can carry the floating particles into the fermentation liquor again.
Compared with the traditional mechanical stirring mode, the mode of top and bottom material backflow circulation and pneumatic stirring can greatly improve the uniformity of the materials, and the stirring mode of the invention is more suitable for large-scale biogas anaerobic engineering, is not limited by the specification of a fermentation tank matched with a stirrer, and reduces insufficient fermentation or tank cleaning caused by mechanical failure. The problem of fermentation liquor surface crusting which is easy to occur in the traditional mechanical stirring can be avoided, and the fermentation degradation rate and the methane yield are greatly improved.
The traditional fermentation tank heat exchange generally adopts a mode of indirect heat exchange of a pipe wall coil of the fermentation tank or heat exchange of materials outside the tank, the invention combines the structure of the stirring sleeve, adopts the built-in vertical sleeve with a flow passage for heat exchange, integrates the fermentation tank and the heat exchanger into a whole, saves investment and occupied area, and improves heat exchange efficiency.
Drawings
FIG. 1 is a schematic view of a wet anaerobic fermentation system of the present invention
In the figure: anaerobic fermentation tank 1, circulating pump 2, booster pump 3, upright sleeve 4, runner 5, liquid outlet 6, go up liquid import 7, lower liquid inlet 8, liquid exit tube 9, last circulating connection pipe 10, lower circulating connection pipe 11, outlet duct 12, intake pipe 13, air outlet valve 14, heat transfer medium advance pipe 15, heat transfer medium exit tube 16, shielding plate 17, silt is detained bowl 18, marsh gas outlet 19.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1, a wet anaerobic fermentation system includes an anaerobic fermentation tank 1, a circulation pump 2 and a booster pump 3. The top of the anaerobic fermentation tank is provided with a methane outlet 19. The anaerobic fermentation tank is cylindrical. A vertical sleeve 4 is arranged in the anaerobic fermentation tank. The vertical sleeve is of a heat conduction structure. A flow passage 5 is arranged in the vertical sleeve. The anaerobic fermentation tank is provided with a liquid outlet 6. The upper end of the side wall of the anaerobic fermentation tank is provided with an upper liquid inlet 7, and the lower end is provided with a lower liquid inlet 8. The inlet of the circulating pump is connected with the liquid outlet through a liquid outlet pipe 9, and a desander (not shown in the figure) is arranged on the liquid outlet pipe. The upper liquid inlet is connected with the outlet of the circulating pump through an upper circulating connecting pipe 10, and the anaerobic fermentation tank, the liquid outlet pipe, the circulating pump, the upper circulating connecting pipe and the upper liquid inlet form an upper circulating loop. The lower liquid inlet is connected with the outlet of the circulating pump through a lower circulating connecting pipe 11, and the anaerobic fermentation tank, the liquid outlet pipe, the circulating pump, the lower circulating connecting pipe and the lower liquid inlet form a lower circulating loop. The outlet of the booster pump is connected with an air outlet pipe 12 which is arranged in the vertical sleeve in a penetrating way. The inlet of the booster pump is connected with the methane outlet through an air inlet pipe 13. The methane outlet is also connected with a gas outlet valve 14. The gas outlet valve and the gas outlet pipe are connected in parallel on the methane outlet. The flow channel is connected with a heat exchange medium inlet pipe 15 and a heat exchange medium outlet pipe 16 which extend out of the anaerobic fermentation tank. The opening direction line of the upper liquid inlet is tangent to a cylinder taking the axis of the anaerobic fermentation tank as an axis, and the opening direction line of the lower liquid inlet is tangent to a cylinder taking the axis of the anaerobic fermentation tank as an axis. The rotating direction of the rotational flow generated in the anaerobic fermentation tank by the liquid entering from the upper liquid inlet is opposite to that of the rotational flow generated in the anaerobic fermentation tank by the liquid entering from the lower liquid inlet. The lower part of the anaerobic fermentation tank is provided with a baffle plate 17 which is arranged above the lower liquid inlet. The baffle plate is inclined in a state that one end connected with the anaerobic fermentation tank is higher and the other end is lower. The lower end of the shielding plate is positioned right below the vertical sleeve. The liquid outlet is located below the lower liquid inlet. The bottom of the anaerobic fermenter is provided with a sludge retention bowl 18 below the liquid inlet.
The specific process of the wet anaerobic fermentation stirring and heat exchange method by the wet anaerobic fermentation system of the invention is as follows: liquid in the anaerobic fermentation tank flows out from a liquid flow outlet through a circulating pump and then flows back into the anaerobic fermentation tank from an upper liquid inlet and a lower liquid inlet to form a rotational flow rotating in the horizontal direction so as to perform a stirring action in one direction; biogas in the anaerobic fermentation tank is pressurized from the biogas outlet output handle through the booster pump and then is input into liquid in the vertical sleeve in the anaerobic fermentation tank through the gas outlet pipe, the biogas input into the vertical sleeve upwards emerges from the liquid in the vertical sleeve to drive the liquid in the vertical sleeve to upwards flow, the liquid in the vertical sleeve upwards flows to drive the liquid outside the vertical sleeve to downwards flow, and secondary stirring in the other direction of the liquid in the anaerobic fermentation tank is realized. The heat exchange medium flows out from the heat exchange medium outlet pipe after being input into the flow channel of the vertical sleeve through the heat exchange medium inlet pipe, and the heat exchange medium generates heat exchange with liquid in the anaerobic fermentation tank when flowing through the flow channel of the vertical sleeve, so that the liquid in the anaerobic fermentation tank is heated or cooled.
Claims (9)
1. A wet anaerobic fermentation system, which comprises an anaerobic fermentation tank, wherein the top of the anaerobic fermentation tank is provided with a biogas outlet, it is characterized by also comprising a circulating pump and a booster pump, wherein a vertical sleeve is arranged in the anaerobic fermentation tank, the vertical sleeve is of a heat conduction structure, a flow channel is arranged in the vertical sleeve, the anaerobic fermentation tank is provided with a liquid outlet, the upper end of the side wall of the anaerobic fermentation tank is provided with an upper liquid inlet, the lower end is provided with a lower liquid inlet, the inlet of the circulating pump is connected with the liquid outlet, the upper liquid inlet and the lower liquid inlet are connected with the outlet of the circulating pump in parallel, the outlet of the booster pump is connected with an air outlet pipe which is arranged in the vertical sleeve in a penetrating way, the inlet of the booster pump is connected with the methane outlet, the runner is connected with a heat exchange medium inlet pipe and a heat exchange medium outlet pipe which extend out of the anaerobic fermentation tank.
2. The wet anaerobic fermentation system of claim 1, wherein the anaerobic fermentation tank is cylindrical, the upper liquid inlet is formed in a direction tangential to a cylinder having an axis of the anaerobic fermentation tank, and the lower liquid inlet is formed in a direction tangential to a cylinder having an axis of the anaerobic fermentation tank.
3. A wet anaerobic fermentation system according to claim 2, wherein the rotational direction of the swirling flow generated in the anaerobic fermentation tank by the liquid entering from the upper liquid inlet is opposite to the rotational direction of the swirling flow generated in the anaerobic fermentation tank by the liquid entering from the lower liquid inlet.
4. A wet anaerobic fermentation system according to claim 1, 2 or 3, wherein the lower part of said anaerobic fermentation tank is provided with a shielding plate for shielding above said lower liquid inlet.
5. The wet anaerobic fermentation system as claimed in claim 4, wherein the shielding plate is inclined in a state that one end connected to the anaerobic fermentation tank is higher and the other end is lower.
6. A wet anaerobic fermentation system according to claim 5, wherein the lower end of the shielding plate is located directly below the vertical sleeve.
7. A wet anaerobic fermentation system according to claim 1, 2 or 3, wherein said liquid outlet is located below said lower liquid inlet, and the bottom of said anaerobic fermentation tank is provided with a sludge retention bowl lower than said liquid inlet.
8. A wet anaerobic fermentation system according to claim 1, 2 or 3, wherein the inlet end of said circulation pump is connected to said liquid outlet through a desander.
9. A wet anaerobic fermentation stirring and heat exchange method is characterized in that liquid in an anaerobic fermentation tank flows out through a circulating pump and then flows back to the liquid in the anaerobic fermentation tank in a direction tangential to a cylinder taking the axis of the anaerobic fermentation tank as an axis to drive the liquid in the anaerobic fermentation tank to generate rotational flow rotating in the horizontal direction so as to carry out primary stirring; pressurizing biogas in the anaerobic fermentation tank by a booster pump, inputting the pressurized biogas into liquid in a vertical sleeve in the anaerobic fermentation tank, enabling the biogas input into the vertical sleeve to upwards emerge from the liquid in the vertical sleeve so as to drive the liquid in the vertical sleeve to upwards flow, and enabling the liquid outside the vertical sleeve to downwards flow due to the upwards flow of the liquid in the vertical sleeve so as to realize secondary stirring of the liquid in the anaerobic fermentation tank; the heat exchange medium flows out from the heat exchange medium outlet pipe after being input into the flow channel of the vertical sleeve through the heat exchange medium inlet pipe, and the heat exchange medium generates heat exchange with liquid in the anaerobic fermentation tank when flowing through the flow channel of the vertical sleeve, so that the liquid in the anaerobic fermentation tank is heated or cooled.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112010426A (en) * | 2020-08-24 | 2020-12-01 | 苏州恺利尔环保科技有限公司 | Novel vertical anaerobic reactor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3630848A (en) * | 1967-12-29 | 1971-12-28 | Louis Alfred Auguste Lefrancoi | Continuous fermentation method and device |
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