Efficient IC (internal circulation) anaerobic reactor system capable of intensifying reflux stirring of biogas
By integrating biogas storage and pressure stabilization tanks and forced reflux stirring systems in IC anaerobic reactors, the problem of high energy consumption in traditional IC anaerobic reactors is solved, energy saving and consumption reduction and efficient utilization of biogas resources are achieved, and methane production is improved.
Patent Information
- Application Number
- CN202422221379.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-10
AI Technical Summary
The energy consumption of mechanical and hydraulic stirring in traditional IC anaerobic reactors is high, resulting in an increase in operating costs, and the prior art has failed to effectively utilize biogas resources for stirring and strengthening.
Design an efficient IC anaerobic reactor system for enhanced reflux stirring in biogas. It uses a biogas storage and stabilization tank to collect and supercharge biogas, and stir it through a forced reflux stirrer and a booster fan. Combined with a remote pressure gauge and an automatic valve control system, the biogas pressure is automatically adjusted to reduce the demand for mechanical stirring and hydraulic stirring.
It reduces equipment investment and operation energy consumption, improves the stirring efficiency of the anaerobic reactor, reduces the demand for circulating flow, saves water treatment costs, and improves the utilization efficiency of biogas and methane production.
Smart Images
Figure CN223118446U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewage treatment, in particular to a high-efficiency IC anaerobic reactor system with enhanced biogas reflux stirring. Background Art
[0002] In a traditional IC anaerobic reactor / tower, the sludge layer in the anaerobic reactor / tower is mainly kept in a suspended state by mechanical stirring or hydraulic stirring, so as to ensure sufficient contact between the sewage pollutants and the anaerobic sludge, and improve the mass transfer and pollutant removal efficiency.
[0003] Although mechanical stirring or hydraulic stirring ensures the mixing effect between the sewage pollutants and the anaerobic sludge in the anaerobic reactor, in order to ensure that the sludge layer can be in a suspended state, it is necessary to ensure the upward flow velocity of the water flow in the anaerobic pipe through mechanical stirring with a certain intensity or a certain flow rate of circulating flow ratio. As a result, the energy consumption of mechanical stirring and hydraulic stirring is very high, which is the main component of the operating cost of anaerobic sewage treatment.
[0004] Through anaerobic reaction, the anaerobic reactor can finally convert pollutants such as COD and BOD into methane, carbon dioxide and water. The anaerobic reactor separates the anaerobic sludge, treated sewage and biogas (methane) through a three-phase separator. The biogas accumulates at the top of the three-phase separator and is transported to the steam-water separator at the top of the anaerobic reactor through a biogas collection pipe. The sewage brought to the steam-water separator by the biogas returns to the bottom of the anaerobic tower through a reflux pipe. Usually, the biogas accumulated at the top of the steam-water separator is transported to a biogas boiler for combustion through a biogas blower and a biogas transport pipe. Summary of the Utility Model
[0005] Aiming at the deficiencies in the prior art, the utility model provides a high-efficiency IC anaerobic reactor system with enhanced biogas reflux stirring.
[0006] The utility model discloses a high-efficiency IC anaerobic reactor system with enhanced biogas reflux stirring, comprising: an anaerobic reactor tower body;
[0007] The anaerobic reactor tower body includes a lower reaction zone, a three-phase separator in the lower reaction zone, an upper reaction zone and a three-phase separator in the upper reaction zone which are arranged in sequence from bottom to top. A lower reaction zone biogas forced reflux stirrer is arranged at the bottom of the lower reaction zone, and an upper reaction zone biogas forced reflux stirrer is arranged at the bottom of the upper reaction zone;
[0008] At the top of the anaerobic reactor tower body, a steam-water separator and a biogas storage and pressure stabilizing tank are installed. The three-phase separator in the lower reaction zone is connected to the steam-water separator through a biogas collection pipe in the lower reaction zone. The three-phase separator in the upper reaction zone is connected to the steam-water separator through a biogas collection pipe in the upper reaction zone. The bottom liquid outlet of the steam-water separator extends into the lower reaction zone through a middle degassed water return pipe. The top gas outlet of the steam-water separator is connected to the biogas storage and pressure stabilizing tank. A remote pressure gauge is provided on the biogas storage and pressure stabilizing tank, and the gas outlet of the biogas storage and pressure stabilizing tank is divided into two paths; the first biogas transmission pipeline is connected to a biogas boiler, and the second biogas transmission pipeline is respectively connected to the biogas forced reflux agitator in the lower reaction zone and the biogas forced reflux agitator in the upper reaction zone, and a biogas pipeline booster fan is arranged on the second biogas transmission pipeline.
[0009] As a further improvement of the present invention, a pressure interlock automatic control valve is provided on the first biogas transmission pipeline. The pressure interlock automatic control valve is linked with the remote pressure gauge. When the remote pressure gauge detects that the pressure in the biogas storage and pressure stabilizing tank reaches a preset value, the pressure interlock automatic control valve automatically opens.
[0010] As a further improvement of the present invention, a lower reaction zone pressure reducing regulating valve is provided on the outer tower section of the biogas forced reflux agitator in the lower reaction zone, and an upper reaction zone pressure reducing regulating valve is provided on the outer tower section of the biogas forced reflux agitator in the upper reaction zone.
[0011] As a further improvement of the present invention, the biogas forced reflux agitator in the lower reaction zone is arranged at the lower end of the water distributor at the bottom of the IC anaerobic reactor, and the biogas forced reflux agitator in the upper reaction zone is arranged above the three-phase separator in the lower reaction zone.
[0012] As a further improvement of the present invention, the biogas collection pipe in the upper reaction zone and the biogas collection pipe in the lower reaction zone lead to the steam-water separator obliquely upward at 45° at the top of the anaerobic reactor tower body.
[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0014] By configuring a biogas storage and pressure stabilizing tank, the present invention can collect the biogas generated by the anaerobic reactor itself. As the amount of biogas collected in the biogas storage and pressure stabilizing tank continuously increases, the biogas pressure in the biogas storage and pressure stabilizing tank also continuously rises. The system makes full use of the biogas pressure stored in the biogas storage and pressure stabilizing tank and cooperates with the biogas pipeline booster fan arranged on the second biogas transmission pipeline to realize the forced reflux stirring of biogas;
[0015] Through the linkage of the remote pressure gauge and the automatic control interlocking valve, the utility model can automatically discharge the excess biogas from the system, ensuring that the pressure in the biogas storage pressure stabilizing tank and the entire high-efficiency IC anaerobic reactor system is stable within a certain range, and ensuring the stable operation of the anaerobic system; since the system uses the biogas pressure stored in the biogas storage pressure stabilizing tank to transport biogas to the biogas boiler for combustion, the system does not need to be equipped with a biogas transport blower, saving the equipment investment cost and also saving the operation energy consumption and cost of water treatment; the system makes full use of the biogas pressure stored in the biogas storage pressure stabilizing tank, and only needs to set up a low-pressure and low-power biogas pipeline booster fan on the biogas forced reflux main pipe to achieve biogas forced reflux stirring; at the same time, due to the strengthening of the gas stirring effect inside the anaerobic reactor by the biogas forced reflux stirring, the mechanical stirring intensity or the hydraulic stirring circulation flow ratio can be reduced, achieving the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 FIG. is a schematic structural diagram of a high-efficiency IC anaerobic reactor system with enhanced biogas reflux stirring disclosed by the utility model.
[0017] In the figure:
[0018] 1. Anaerobic reactor tower body; 2. Lower reaction zone; 3. Three-phase separator in the lower reaction zone; 4. Upper reaction zone; 5. Three-phase separator in the upper reaction zone; 6. Biogas collection pipe in the lower reaction zone; 7. Biogas forced reflux stirrer in the lower reaction zone; 8. Biogas forced reflux stirrer in the upper reaction zone; 9. Steam-water separator; 10. Biogas storage pressure stabilizing tank; 11. Biogas collection pipe in the upper reaction zone; 12. Middle degassing water reflux pipe; 13. Remote pressure gauge; 14. Pressure interlocking automatic control valve; 15. Pressure reducing regulating valve in the lower reaction zone; 16. Pressure reducing regulating valve in the upper reaction zone; 17. Biogas pipeline booster fan. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0020] The following will further describe the present utility model in detail with reference to the accompanying drawings:
[0021] As Figure 1As shown in the figure, the utility model provides a high-efficiency IC anaerobic reactor system for enhanced biogas reflux stirring, comprising: an anaerobic reactor tower body 1, a steam-water separator 9, a biogas storage and pressure stabilizing tank 10, a remote pressure gauge 13, a pressure interlock self-control valve 14, a lower reaction zone pressure reducing and regulating valve 15, and an upper reaction zone pressure reducing and regulating valve 16; wherein,
[0022] The anaerobic reactor tower body 1 of the present utility model includes a lower reaction zone 2, a lower reaction zone three-phase separator 3, an upper reaction zone 4, and an upper reaction zone three-phase separator 5 arranged in sequence from bottom to top. The bottom of the lower reaction zone 2 is provided with a lower reaction zone biogas forced reflux agitator 7, a water inlet, and a water distributor (not shown in the figure). The lower reaction zone biogas forced reflux agitator 7 is arranged at the lower end of the water distributor at the bottom of the IC anaerobic reactor; the bottom of the upper reaction zone 4 is provided with an upper reaction zone biogas forced reflux agitator 8, and the upper reaction zone biogas forced reflux agitator 8 is arranged above the lower reaction zone three-phase separator 3. The top of the anaerobic reactor tower body 1 of the present utility model is installed with a steam-water separator 9 and a biogas storage and pressure stabilizing tank 10. The lower reaction zone three-phase separator 3 is connected to the steam-water separator 9 through a lower reaction zone biogas collection pipe 6, and the upper reaction zone three-phase separator 5 is connected to the steam-water separator 9 through an upper reaction zone biogas collection pipe 11. The upper reaction zone biogas collection pipe 11 and the lower reaction zone biogas collection pipe 6 lead to the steam-water separator 9 obliquely upward at 45° at the top of the anaerobic reactor tower body, which can prevent biogas from accumulating in the collection pipe and ensure smooth gas passage. The bottom liquid outlet of the steam-water separator 9 extends into the lower reaction zone 2 through a middle degassed water reflux pipe 12, and the water outlet end of the middle degassed water reflux pipe 12 is close to the position of the lower reaction zone biogas forced reflux agitator 7; the top gas outlet of the steam-water separator 9 is connected to the biogas storage and pressure stabilizing tank 10. A remote pressure gauge 13 is provided on the biogas storage and pressure stabilizing tank 10, and the gas outlet of the biogas storage and pressure stabilizing tank 10 is divided into two paths; the first biogas transmission pipeline is connected to a biogas boiler, and a pressure interlock self-control valve 14 is provided on the first biogas transmission pipeline. The pressure interlock self-control valve 14 is linked with the remote pressure gauge 13. When the remote pressure gauge 13 detects that the pressure in the biogas storage and pressure stabilizing tank 10 reaches a preset value, the pressure interlock self-control valve 14 automatically opens. The first biogas transmission pipeline can achieve long-distance transmission of biogas without configuring a biogas blower, achieving the purpose of energy conservation and consumption reduction; the second biogas transmission pipeline (biogas forced reflux main pipe) is respectively connected to the lower reaction zone biogas forced reflux agitator 7 and the upper reaction zone biogas forced reflux agitator 8. A lower reaction zone pressure reducing regulating valve 15 is provided on the outer section of the tower of the lower reaction zone biogas forced reflux agitator 7, and an upper reaction zone pressure reducing regulating valve 16 is provided on the outer section of the tower of the upper reaction zone biogas forced reflux agitator 8; specifically: the outlet of the second biogas transmission pipeline is respectively connected to the outer section of the tower of the lower reaction zone biogas forced reflux agitator 7 and the inlet of the outer section of the tower of the upper reaction zone biogas forced reflux agitator 8. A biogas pipeline booster fan 17 is arranged on the second biogas transmission pipeline. The lower reaction zone biogas forced reflux agitator 7 and the upper reaction zone biogas forced reflux agitator 8 can share the same biogas pipeline booster fan 17, that is, the biogas pipeline booster fan 17 is arranged on the main pipe, such as Figure 1As shown; alternatively, a biogas pipeline booster fan 17 can be provided for each of the biogas forced reflux stirrer 7 in the lower reaction zone and the biogas forced reflux stirrer 8 in the upper reaction zone, that is, the biogas pipeline booster fan 17 is provided on its respective branch pipe. Among them, the opening pressure of the pressure interlock self-control valve 14 is greater than the opening pressures of the pressure reducing regulating valve 16 in the upper reaction zone and the pressure reducing regulating valve 15 in the lower reaction zone.
[0023] The biogas accumulated in the steam-water separator at the top of the anaerobic tower usually has a gas pressure of 0.08 - 0.15 MPa. The present utility model makes full use of this part of the residual pressure and sets a low-pressure and low-power biogas pipeline booster fan 17 on the main biogas forced reflux stirring pipe, so as to achieve biogas forced reflux stirring, which can effectively reduce the equipment investment cost and the operation energy consumption of the biogas fan.
[0024] The usage method of the present utility model includes:
[0025] Sewage enters the IC anaerobic reactor tower body, and anaerobic reactions occur in the upper / lower reaction zones, generating biogas; the biogas is separated from the anaerobic sludge and sewage in the upper / lower three-phase separators and accumulates at the top of the upper / lower three-phase separators; it enters the steam-water separator through the biogas collection pipes in the upper / lower reaction zones. In the steam-water separator, after the sewage carried up by the biogas is separated from the biogas, it flows back to the bottom of the high-efficiency IC anaerobic reactor through the middle degassing water return pipe, which can strengthen the bottom stirring while reducing the circulation flow rate, saving energy and reducing consumption. The biogas enters the biogas storage and pressure stabilizing tank from the top of the steam-water separator. The biogas storage and pressure stabilizing tank can store a certain amount of biogas. A remote pressure gauge is provided at the top of the biogas storage and pressure stabilizing tank to monitor the biogas pressure in the biogas storage and pressure stabilizing tank in real time.
[0026] After passing through the biogas storage and pressure-stabilizing tank, the biogas flows in two directions: (1) an automatic control valve interlocked with the pressure gauge on the top of the biogas storage and pressure-stabilizing tank is set on one branch of the pipeline. When the pressure value monitored by the pressure gauge on the top of the biogas storage and pressure-stabilizing tank exceeds the set pressure, the automatic control valve opens to release a part of the biogas to the biogas boiler for combustion (the other part of the biogas still flows to the biogas forced reflux agitator), thereby controlling the biogas pressure in the anaerobic tank and the biogas storage and pressure-stabilizing tank within a certain range and preventing overpressure, thereby preventing the anaerobic tank from exploding due to overpressure of the biogas. After the biogas storage and pressure-stabilizing tank is depressurized through this biogas delivery pipe, the pressure value drops below the set pressure value, then the automatic control valve closes, and all the biogas flows to the other branch, thereby stably controlling the biogas pressure in the biogas storage and pressure-stabilizing tank within a certain range. (2) Another biogas path enters the upper / lower biogas forced reflux agitator. Before entering the anaerobic tank, a biogas pipeline booster fan is installed on the biogas forced reflux main pipe, and the upper / lower reaction zone biogas forced reflux pressure reducing regulating valve is installed in coordination. The pressure after the pressure reducing regulating valve can be set according to the height of the upper / lower reaction zone. For example, if the height of the upper reaction zone of the designed IC anaerobic reactor is 10m and the height of the lower reaction zone is 15m, that is, the overall height of the IC anaerobic reactor is 25m, then the upper reaction zone pressure reducing regulating valve can be installed The back pressure is 0.2MPa, and the back pressure of the pressure reducing regulating valve in the lower reaction zone is 0.35MPa, which can ensure that the biogas pressure after the pressure reduction by the pressure reducing valve is still greater than the sum of the water pressure in the anaerobic reactor, the loss along the pipeline and the local loss of the orifice of the biogas forced reflux agitator in the upper / lower reaction zone, so that the biogas can smoothly pass through the biogas forced reflux agitator into the anaerobic tank for stirring; the biogas enters the anaerobic reactor through the pressure reducing regulating valve and the biogas forced reflux agitator in the upper / lower reaction zone, thereby enhancing the stirring effect in the anaerobic tank.
[0027] The advantages of the utility model are:
[0028] The utility model can collect the biogas generated by the anaerobic reactor itself by configuring a biogas storage and pressure-stabilizing tank. As the amount of biogas collected in the biogas storage and pressure-stabilizing tank continues to increase, the biogas pressure in the biogas storage and pressure-stabilizing tank continues to increase at the same time. The system fully utilizes the pressure of the biogas stored in the biogas storage and pressure-stabilizing tank, and cooperates with the biogas pipeline booster fan arranged on the biogas forced reflux main pipe to realize the forced reflux mixing of the biogas.
[0029] Through the linkage of the remote pressure gauge and the automatic control interlock valve, the utility model can automatically discharge the excess biogas from the system, ensuring that the pressure in the biogas storage pressure stabilizing tank and the entire high-efficiency IC anaerobic reactor system is stable within a certain range, and ensuring the stable operation of the anaerobic system. Since the system uses the biogas pressure stored in the biogas storage pressure stabilizing tank to transport biogas to the biogas boiler for combustion, the system does not need to be equipped with a biogas delivery fan, saving the equipment investment cost and also saving the operation energy consumption and cost of water treatment. The system makes full use of the biogas pressure stored in the biogas storage pressure stabilizing tank, and only needs to set up a low-pressure and low-power biogas pipeline booster fan on the biogas forced reflux main pipe to achieve biogas forced reflux stirring. At the same time, since the biogas forced reflux stirring strengthens the gas stirring effect inside the anaerobic reactor, the mechanical stirring intensity or the hydraulic stirring circulation flow ratio can be reduced, achieving the purpose of energy conservation and consumption reduction.
[0030] Part of the carbon dioxide is contained in the biogas refluxed by the utility model. This part of carbon dioxide can be converted into acetic acid through the action of homoacetogenic bacteria, and then further converted into methane through the action of methanogens, thereby increasing the biogas production and the purity of methane in the biogas.
[0031] The above are only the preferred embodiments of the utility model and are not used to limit the utility model. For those skilled in the art, the utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. An efficient IC anaerobic reactor system with enhanced biogas reflux stirring, characterized in that Comprising: Anaerobic reactor tower body; The anaerobic reactor tower body includes a lower reaction zone, a lower reaction zone three-phase separator, an upper reaction zone, and an upper reaction zone three-phase separator arranged in sequence from bottom to top. A lower reaction zone biogas forced reflux agitator is provided at the bottom of the lower reaction zone, and an upper reaction zone biogas forced reflux agitator is provided at the bottom of the upper reaction zone; A steam-water separator and a biogas storage and pressure stabilizing tank are installed at the top of the anaerobic reactor tower body. The lower reaction zone three-phase separator is connected to the steam-water separator through a lower reaction zone biogas collection pipe, and the upper reaction zone three-phase separator is connected to the steam-water separator through an upper reaction zone biogas collection pipe. The bottom liquid outlet of the steam-water separator extends into the lower reaction zone through a middle degassed water reflux pipe. The top gas outlet of the steam-water separator is connected to the biogas storage and pressure stabilizing tank. A remote pressure gauge is provided on the biogas storage and pressure stabilizing tank, and the gas outlet of the biogas storage and pressure stabilizing tank is divided into two paths; the first biogas transmission pipeline is connected to a biogas boiler, and the second biogas transmission pipeline is respectively connected to the lower reaction zone biogas forced reflux agitator and the upper reaction zone biogas forced reflux agitator, and a biogas pipeline booster fan is provided on the second biogas transmission pipeline.
2. The high-efficiency IC anaerobic reactor system with enhanced biogas reflux stirring according to claim 1, characterized in that, A pressure interlock self-control valve is provided on the first biogas transmission pipeline, and the pressure interlock self-control valve is interlocked with the remote pressure gauge. When the remote pressure gauge detects that the pressure in the biogas storage and pressure stabilizing tank reaches a preset value, the pressure interlock self-control valve automatically opens.
3. The high-efficiency IC anaerobic reactor system with enhanced biogas reflux stirring as described in claim 1, characterized in that, A lower reaction zone pressure reducing regulating valve is provided on the outer section of the tower of the lower reaction zone biogas forced reflux agitator, and an upper reaction zone pressure reducing regulating valve is provided on the outer section of the tower of the upper reaction zone biogas forced reflux agitator.
4. The high-efficiency IC anaerobic reactor system with enhanced biogas reflux stirring as claimed in claim 1, wherein The lower reaction zone biogas forced reflux agitator is arranged at the lower end of the water distributor at the bottom of the IC anaerobic reactor, and the upper reaction zone biogas forced reflux agitator is arranged above the lower reaction zone three-phase separator.
5. The high-efficiency IC anaerobic reactor system for enhanced biogas reflux stirring as described in claim 1, characterized in that, The upper reaction zone biogas collection pipe and the lower reaction zone biogas collection pipe lead to the steam-water separator obliquely upward at 45° at the top of the anaerobic reactor tower body.