Spiral symmetrical impinging stream anaerobic reactor system

Abstract

The invention relates to a spiral symmetrical impinging stream anaerobic reactor system, which belongs to the technical field of wastewater treatment, and comprises a reactor, the reactor is provided with a water distribution zone, a reaction zone and a three-phase separation zone from bottom to top, the reaction zone is provided with an impinging stream buffer zone and an impinging stream reaction zone from bottom to top, and the impinging stream buffer zone is provided with a plurality of jet pipes from bottom to top. The jet pipe is supplied with hydrogen and / or biogas. The jet pipe is combined, exogenous hydrogen is provided, and the impinging flow state of fluid in the reactor is increased, so that liquid-solid mass transfer is enhanced, the anaerobic biological treatment efficiency is improved, and the system runs in a green and low-carbon manner.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a spiral symmetrical impinging flow anaerobic reactor system. Background Art

[0002] With the development of modern industry, the pollution of industrial wastewater is becoming more and more serious, causing serious pollution to the environment. Wastewater generated by printing and dyeing, chemical industry, papermaking and other industries usually contains a large amount of organic matter, high salinity, difficult-to-degrade substances, and toxic and harmful components, with COD content as high as 10000mg / L or more. It is extremely harmful to human body and environment, so the treatment of these pollutants is very necessary.

[0003] Anaerobic reactors are favored in the field of industrial wastewater treatment due to their high efficiency degradation ability, wide adaptability, biogas production and low energy consumption. As the COD concentration of industrial wastewater gradually increases and the organic components become more complex, the performance of existing anaerobic reactors (such as UASB, EGSB and IC reactors, as well as the spiral symmetric flow anaerobic reactor invented by the applicant) can no longer meet the urgent needs of efficient anaerobic biological treatment of industrial wastewater.

[0004] Impinging streams are one of the new research advances in the field of efficient momentum transfer. The basic principle is to generate two high-speed fluids in relative motion directions, which form a disturbance zone with extremely high turbulence intensity after collision at the contact surface, thereby enhancing the interphase mass transfer rate. Impinging stream technology can effectively enhance interphase transfer and promote micro-mixing because its two fluids collide at high speed to form a violently turbulent collision zone. Accordingly, in order to enhance the interphase mass transfer of liquid and solid (matrix and microorganisms) phases, the applicant has integrated new impinging stream technologies and new ideas on the basis of the existing invention patent of spiral symmetric flow anaerobic reactor to obtain new functions and high efficiency, thereby inventing a spiral symmetric impinging stream anaerobic reactor system equipment.

[0005] In order to improve the activity of anaerobic functional bacteria and increase methane production, the hydrogen partial pressure of the anaerobic system can be reasonably regulated. Studies have shown that the hydrogen partial pressure can be artificially regulated by adding exogenous hydrogen to promote H 2 and CO 2 The methane content in biogas can be increased from 50% to 70% to about 87% by adding exogenous hydrogen in situ. In addition, on the one hand, increasing the hydrogen concentration in the anaerobic reactor may enhance the activity of homoacetogenic bacteria, produce acetic acid through the homoacetogenic pathway, and thus increase methane production; on the other hand, high hydrogen partial pressure may inhibit the hydrogen and acetic acid production process, and the accumulation of volatile fatty acids leads to a decrease in the pH value of anaerobic digestion, which has a negative impact on anaerobic digestion. Therefore, by setting exogenous hydrogen and setting valves on each exhaust pipe to regulate the hydrogen partial pressure (usually 1.6 to 10Pa), the methane yield of the anaerobic system can be improved. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a spirally symmetrical impinging flow anaerobic reactor system, which combines a jet tube and provides exogenous hydrogen to increase the impinging flow state of the fluid inside the reactor, thereby strengthening liquid-solid mass transfer and improving the anaerobic biological treatment efficiency, so that the system runs green and low-carbon.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a spirally symmetrical impinging flow anaerobic reactor system, including a reactor, wherein the reactor is provided with a water distribution zone, a reaction zone and a three-phase separation zone from bottom to top, the reaction zone is provided with an impinging flow buffer zone and an impinging flow reaction zone from bottom to top, the impinging flow buffer zone is provided with a plurality of jet tubes distributed from bottom to top, and the jet tubes are supplied with hydrogen and / or biogas.

[0008] Preferably, the volume ratio of the impinging flow reaction zone to the impinging flow buffer zone ranges from 3:1 to 5:1.

[0009] Preferably, the number of the jet tubes is three, which are distributed at 1 / 5 to 3 / 5 of the axial direction of the impinging flow reaction zone and are arranged in a spiral symmetry.

[0010] Preferably, the ratio of the distance between two adjacent jet tubes to the total length of the impinging flow reaction zone is in the range of 1:3 to 1:5.

[0011] Preferably, the jet tube has a tangential opening on the impinging flow reaction zone, and the ratio of the hole diameter d to the diameter D of the impinging flow reaction zone is in the range of 1:3 to 1:10.

[0012] Preferably, the water distribution area includes a bottom valve, an inverted cone, a support leg, and a water inlet pipe. The upper surface of the inverted cone is connected to the lower end of the reaction zone. The reactor is connected to an exogenous hydrogen storage tank, a water inlet barrel, a water inlet pump and a circulation pump. The wastewater in the water inlet barrel is pumped into the water inlet pipe at the top of the water distribution area of ​​the reactor through the water inlet pump; the exogenous hydrogen storage tank is provided with an exogenous hydrogen pipe, and the exogenous hydrogen pipe is divided into multiple paths and respectively connected to the jet tubes.

[0013] Preferably, the circulation pump input port is connected to the three-phase separation zone, and the circulation pump output port is connected to the water inlet of the jet tube. The wastewater in the three-phase separation zone flows back to the impact flow area where the jet tube of the reaction zone is located, thereby realizing the partitioned reflux effect.

[0014] Preferably, the three-phase separation zone is provided with a short cone, an upper column and a cover plate from bottom to top, and a three-phase separation component is provided inside the upper column; a water outlet pipe is provided at the middle and upper part of the upper column, and the cover plate is connected to the upper part of the three-phase separation component; the endogenous biogas collection pipe is connected to the center position of the top of the three-phase separation component, and the endogenous biogas collection pipe is divided into multiple paths, which are respectively connected to the gas collection pipe and the multiple jet tubes.

[0015] Preferably, when exogenous hydrogen is introduced into the jet tube, the exogenous hydrogen can be driven by the wastewater in the jet tube into the reaction zone to provide the required hydrogen for the reaction zone.

[0016] Preferably, it further comprises a program controller, the jet tube is connected to a gas pipe for supplying hydrogen and biogas, and the gas pipe is provided with an electric valve electrically connected to the program controller.

[0017] In summary, the present invention includes the following beneficial technical effects:

[0018] First, the jet tube is opened in a tangential manner on the impact flow reaction zone II-1. After the wastewater is injected into the jet tube through the circulation pump, it collides in the opposite direction with the wastewater in the spiral swirl direction on the section under the action of the first jet tube 5, the second jet tube 15 and the third jet tube 6. Macroscopically, this setting causes the two wastewaters to have a strong interaction and high-intensity momentum transfer; microscopically, it puts the wastewater in a condensed state where the molecules are tightly gathered, forming a violently turbulent impact zone, so that the reactor presents an impact flow state in the longitudinal direction. This not only improves the efficient anaerobic biodegradation efficiency of pollutants, but also realizes the efficient intensiveness of the reaction combination.

[0019] Second, the circulation pipe of the reactor is connected to the water inlet of the jet tube, so that the wastewater in the three-phase separation zone III can flow back to the impact flow area where each jet tube of the reaction zone II is located, realizing zoned reflux and completing the recovery of alkalinity.

[0020] Third, the jet inlet pipe of the reactor is connected to the air intake of the jet tube. The exogenous hydrogen or endogenous biogas in the jet inlet pipe enters the jet tube, and at the same time, the wastewater also enters the jet tube under the action of the circulation pump. The static pressure energy of the wastewater is converted into dynamic pressure energy in this process, forming a negative pressure zone at the air intake (see Figure B, marked as b). In this way, the exogenous hydrogen or endogenous biogas is "entrained" by the wastewater and enters the impact flow reaction zone Ⅱ-1 together. This process not only provides the required hydrogen for the reactor and promotes the methanogenesis process, but also realizes the stirring of the wastewater by gas, enhances the contact between the sewage and the microbial substrate, and thus accelerates the mass transfer process between the liquid and solid phases.

[0021] Fourth, an impingement flow buffer zone II-2 is specially provided in the reaction zone II. The buffer zone can slow down or even eliminate the impingement flow state in the reaction zone II, thereby enhancing the separation effect of the three-phase separation zone III.

[0022] Fifth, in the spiral symmetric impinging flow anaerobic reactor system, an exogenous hydrogen storage tank is also provided to adjust the hydrogen partial pressure in the reactor. During the startup or operation phase of the reactor (such as when the system is short of hydrogen or when the temperature changes suddenly), the exogenous hydrogen enters the jet tube through the exogenous hydrogen pipe 17 and is "entrained" by the wastewater into the reaction zone II, providing the required hydrogen for the reactor, thereby adjusting the hydrogen partial pressure of the entire reactor. This design ensures the stability of the reactor during the startup and operation phases, effectively reduces accidental risks, and promotes the generation of methane.

[0023] Sixth, the reactor is equipped with a program controller 18, and electric valves are provided on the gas collection pipe 11, the first jet air inlet pipe 5-2, the second jet air inlet pipe 15-2, the third jet air inlet pipe 6-2, the exogenous hydrogen pipe 17 and its branches to control the gas flow. In this way, the gas content can be automatically controlled so that each jet pipe can simultaneously introduce exogenous hydrogen and endogenous biogas as needed, or selectively introduce one of the gases. This can automatically meet the hydrogen partial pressure (1.6 to 10.0 Pa) required for the anaerobic digestion system under medium temperature conditions. Within this range, it can avoid the accumulation of intermediate products such as inhibitory volatile fatty acids caused by excessive hydrogen partial pressure, and promote the generation of methane, thereby achieving the simplicity of operation and controllability of the reactor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a spiral symmetrical impinging flow anaerobic reactor system of the present invention;

[0025] Figure 2 This is a structural diagram of a jet tube in a spirally symmetrical impinging flow anaerobic reactor system of the present invention.

[0026] Figure numerals: Ⅰ, water distribution area; Ⅱ, reaction area; Ⅱ-1, impinging flow reaction area; Ⅱ-2, impinging flow buffer area; Ⅲ, three-phase separation area; 1, bottom valve; 2, inverted cone; 3, support foot; 4, water inlet pipe; 5, first jet pipe; 5-1, first circulation pipe; 5-2, first jet air inlet pipe; 6, third jet pipe; 6-1, third circulation pipe; 6-2, third jet air inlet pipe; 7, short cone; 8, upper column; 9, three-phase separation component; 10, cover plate; 11, gas Collection pipe; 12. Endogenous biogas collection pipe; 13. Water outlet pipe; 14. Sampling port; 15. Second jet pipe; 15-1. Second circulation pipe; 15-2. Second jet air inlet pipe; 16. External hydrogen storage tank; 17. External hydrogen pipe; 18. Program controller; N-0. Electric valve one; N-1. Electric valve two; N-2. Electric valve three; N-3. Electric valve four; W-0. Electric valve five; W-1. Electric valve six; W-2. Electric valve seven; W-3. Electric valve eight. DETAILED DESCRIPTION

[0027] In order to make the present invention more obvious and easy to understand, a preferred embodiment is described in detail below with the help of the accompanying drawings. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0028] The embodiment of the present invention discloses a spirally symmetrical impinging flow anaerobic reactor system. The structure of the system is arranged from left to right in sequence with an exogenous hydrogen storage tank 16, a water inlet bucket, a water inlet pump, a reactor and a circulation pump. Among them, the exogenous hydrogen storage tank 16 transports exogenous hydrogen to the inside of the reactor through an exogenous hydrogen pipe 17. The reactor is divided into a water distribution zone I, a reaction zone II and a three-phase separation zone III from bottom to top. The reaction zone II is further subdivided into an impinging flow reaction zone II-1 and an impinging flow buffer zone II-2. In the impinging flow reaction zone II-1, three jet tubes are arranged in a tangential spirally symmetrical manner, namely, a first jet tube 5, a second jet tube 15 and a third jet tube 6. The air intakes of these jet tubes are respectively connected to the first jet air inlet pipe 5-2, the second jet air inlet pipe 15-2 and the third jet air inlet pipe 6-2, and their water inlets are respectively connected to the first circulation pipe 5-1, the second circulation pipe 15-1 and the third circulation pipe 6-1. The present invention has the advantages of promoting micro-mixing, effectively strengthening interphase transfer, and increasing methane yield by introducing exogenous hydrogen and impinging flow technology. This enables the reactor to adopt a greener and lower-carbon decontamination route, achieve an efficient and intensive reaction combination, and enhance the degradation performance of the anaerobic three-stage functional bacteria on organic matter.

[0029] The entire reactor is divided into water distribution zone I, reaction zone II and three-phase separation zone III from bottom to top. Water distribution zone I includes bottom valve 1, inverted cone 2, support leg 3 and water inlet pipe 4, wherein the upper surface of inverted cone 2 is connected to the lower end of reaction zone II. Wastewater is first pumped from the water inlet bucket into the water distribution zone I of the reactor through the water inlet pump, specifically into the water inlet pipe 4 at the top of water distribution zone I.

[0030] In the impinging flow reaction zone II-1, the first jet tube 5, the second jet tube 15 and the third jet tube 6 are arranged from bottom to top. The specific connection method is: the first jet tube 5 is connected to the first circulation tube 5-1 on the left side and the first jet air inlet pipe 5-2 on the top; the second jet tube 15 is connected to the second circulation tube 15-1 on the right side and the second jet air inlet pipe 15-2 on the top; the third jet tube 6 is connected to the third circulation tube 6-1 on the left side and the third jet air inlet pipe 6-2 on the top. The upper part of the impinging flow reaction zone II-1 is the impinging flow buffer zone II-2, and a number of sampling ports 14 are provided on the impinging flow reaction zone II-1 and the impinging flow buffer zone II-2.

[0031] The structure of the three-phase separation zone III is provided with a short cone 7, an upper column 8 and a cover plate 10 from bottom to top, and a three-phase separation component 9 is provided inside the cover plate 10. A water outlet pipe 13 is provided in the middle and upper part of the upper column 8, and the cover plate 10 is connected to the upper part of the three-phase separation component 9. An endogenous biogas collection pipe 12 is provided at the top center of the three-phase separation component 9. The endogenous biogas collection pipe 12 is divided into four paths, which are respectively connected to the first jet air intake pipe 5-2, the second jet air intake pipe 15-2, the third jet air intake pipe 6-2 and the gas collection pipe 11. Electric valve one N-0, electric valve two N-1, electric valve three N-2 and electric valve four N-3 are respectively provided on the gas collection pipe 11, the first jet air intake pipe 5-2, the second jet air intake pipe 15-2 and the third jet air intake pipe 6-2.

[0032] The exogenous hydrogen storage tank 16 is equipped with an exogenous hydrogen pipe 17, which is divided into three ways, respectively connected to the air inlet of the first jet pipe 5, the second jet pipe 15, and the third jet pipe 6 (see Figure B for the specific position, marked as b). On the exogenous hydrogen pipe 17 and its branch, electric valve five W-0, electric valve six W-1, electric valve seven W-2 and electric valve eight W-3 are installed. Through the program controller 18, the endogenous biogas pipe and the electric valves on the exogenous hydrogen pipe 17 and its branch can be controlled, including electric valve two N-1, electric valve three N-2, electric valve four N-3, electric valve five W-0, electric valve six W-1, electric valve seven W-2 and electric valve eight W-3. In this way, each jet pipe can introduce endogenous biogas and exogenous hydrogen at the same time as needed, or only choose to introduce one of the gases, and the whole process can achieve automatic regulation.

[0033] In the impinging flow reaction zone II-1, the first jet tube 5, the second jet tube 15 and the third jet tube 6 are set at the 1 / 5 to 3 / 5 position of the area and are arranged in a spiral symmetric manner. The ratio of the spacing between two adjacent jet tubes to the total length of the impinging flow reaction zone II-1 is 1: (3 to 5). In addition, these three jet tubes are tangentially opened on the impinging flow reaction zone II-1, and the ratio of their aperture d to the diameter D of the impinging flow reaction zone II-1 is 1: (3 to 10). When the wastewater is pumped into these jet tubes through the circulation pump, under the joint action of the first jet tube 5, the second jet tube 15 and the third jet tube 6, the wastewater in the jet tube will collide with the wastewater in the spiral swirl direction on the cross section in the reverse direction. At the macroscopic level, there will be a strong interaction between the two wastewaters, resulting in high-intensity momentum transfer; at the microscopic level, the wastewater will be in a condensed state where the molecules are tightly gathered, so that the impinging flow reaction zone II-1 presents an impinging flow state in the longitudinal direction.

[0034] The first circulation pipe 5-1, the second circulation pipe 15-1 and the third circulation pipe 6-1 are respectively connected to the water inlets (specific positions are shown in Figure B, marked as a) of the first jet pipe 5, the second jet pipe 15 and the third jet pipe 6. In this way, the wastewater in the three-phase separation zone III can flow back to the reaction zone II, specifically, to the impact flow area where the first jet pipe 5, the second jet pipe 15 and the third jet pipe 6 are located. Through this design, the partitioned reflux effect of the wastewater is achieved, thereby enabling effective alkalinity recovery in the impact flow area.

[0035] The first jet inlet pipe 5-2, the second jet inlet pipe 15-2 and the third jet inlet pipe 6-2 are respectively connected to the air intake ports (see Figure B, marked as b) of the first jet tube 5, the second jet tube 15 and the third jet tube 6. When the wastewater enters the jet tube through the circulation pipe, its static pressure energy is converted into dynamic pressure energy, forming a negative pressure zone at the air intake port (Figure B, b). At this time, the exogenous hydrogen or endogenous biogas in the jet inlet pipe is sucked into the jet tube from the air intake port (Figure B, b), and is "entrained" by the flowing wastewater and enters the impinging flow reaction zone II-1 together. This process not only provides the required hydrogen for the reaction zone II, but also realizes the stirring effect of the gas on the wastewater, thereby accelerating the mass transfer process between the liquid and solid phases.

[0036] The volume ratio of the impinging flow reaction zone II-1 to the impinging flow buffer zone II-2 is set to (3-5): 1. This design enables the impinging flow buffer zone II-2 to effectively slow down or even eliminate the strong impinging flow state generated by the impinging flow reaction zone II-1. In this way, the impinging flow buffer zone II-2 further enhances the separation effect of the three-phase separation zone III and improves the efficiency and stability of the entire system during the treatment process.

[0037] The exogenous hydrogen is introduced into the first jet tube 5, the second jet tube 15 and the third jet tube 6 through the exogenous hydrogen pipe 17. Subsequently, the exogenous hydrogen is "entrained" by the flowing wastewater and enters the reaction zone II together. This process not only provides the required hydrogen for the reaction zone II, but also realizes the controllability of the hydrogen partial pressure of the entire reaction zone II, thereby optimizing the reaction conditions and improving the reaction efficiency.

[0038] The program controller 18 is connected to the gas collection pipe 11, the first jet air inlet pipe 5-2, the second jet air inlet pipe 15-2, the third jet air inlet pipe 6-2, the exogenous hydrogen pipe 17 and the electric valves on its branches, which include electric valve 1 N-0, electric valve 2 N-1, electric valve 3 N-2, electric valve 4 N-3, electric valve 5 W-0, electric valve 6 W-1, electric valve 7 W-2 and electric valve 8 W-3. Through the preset program, the program controller 18 can automatically regulate the gas flow rate, so that each jet pipe can introduce exogenous hydrogen and endogenous biogas at the same time, or only introduce one of the gases as needed. This automatic control mechanism ensures that under medium temperature conditions, the anaerobic digestion system can maintain the required hydrogen partial pressure, which is accurately controlled within a range of 1.6 to 10 Pascals. Therefore, the operation of the spiral symmetrical impinging flow anaerobic reactor system becomes extremely simple and easy to control.

[0039] The operation mode of the present invention is as follows:

[0040] The organic wastewater first flows into the water distribution area I through the water inlet pipe 4, and then is evenly distributed and enters the impinging flow reaction zone II-1. The flow path of the wastewater is as follows: first starting from the bottom of the impinging flow reaction zone II-1, then passing through the first jet pipe 5 to enter the middle of the impinging flow reaction zone II-1, then passing through the second jet pipe 15 to reach the upper part of the impinging flow reaction zone II-1, and finally flowing into the impinging flow buffer zone II-2 through the third jet pipe 6. The biogas slurry treated in the reaction zone II then enters the three-phase separation zone III. During this process, the sludge will flow back to the reaction zone II, and the clean water will be discharged through the outlet pipe 13. It is worth noting that part of the clean water will be re-pumped into the first jet pipe 5, the second jet pipe 15 and the third jet pipe 6 through the circulation pipe under the action of the circulation pump. Due to the negative pressure generated by the jet pipe suction port, the endogenous biogas will be introduced into the impinging flow reaction zone II-1 through the first jet inlet pipe 5-2, the second jet inlet pipe 15-2 and the third jet inlet pipe 6-2 respectively.

[0041] In particular, during the start-up phase of the reactor or when the operating conditions change, the external hydrogen storage tank 16 will supply hydrogen to the entire anaerobic system longitudinally through the external hydrogen pipe 17. In order to accurately control the flow of hydrogen, the external hydrogen pipe 17 and its branches, as well as each jet inlet pipe, are equipped with electric valves.

[0042] The spiral symmetric impinging stream reactor system of the present invention has the following significant advantages:

[0043] First, the jet tube is opened in a tangential manner on the impact flow reaction zone II-1. After the wastewater is injected into the jet tube through the circulation pump, it collides in the opposite direction with the wastewater in the spiral swirl direction on the section under the action of the first jet tube 5, the second jet tube 15 and the third jet tube 6. Macroscopically, this setting causes the two wastewaters to have a strong interaction and high-intensity momentum transfer; microscopically, it puts the wastewater in a condensed state where the molecules are tightly gathered, forming a violently turbulent impact zone, so that the reactor presents an impact flow state in the longitudinal direction. This not only improves the efficient anaerobic biodegradation efficiency of pollutants, but also realizes the efficient intensiveness of the reaction combination.

[0044] Second, the circulation pipe of the reactor is connected to the water inlet of the jet tube, so that the wastewater in the three-phase separation zone III can flow back to the impact flow area where each jet tube of the reaction zone II is located, realizing zoned reflux and completing the recovery of alkalinity.

[0045] Third, the jet inlet pipe of the reactor is connected to the air intake of the jet tube. The exogenous hydrogen or endogenous biogas in the jet inlet pipe enters the jet tube, and at the same time, the wastewater also enters the jet tube under the action of the circulation pump. The static pressure energy of the wastewater is converted into dynamic pressure energy in this process, forming a negative pressure zone at the air intake (see Figure B, marked as b). In this way, the exogenous hydrogen or endogenous biogas is "entrained" by the wastewater and enters the impact flow reaction zone Ⅱ-1 together. This process not only provides the required hydrogen for the reactor and promotes the methanogenesis process, but also realizes the stirring of the wastewater by gas, enhances the contact between the sewage and the microbial substrate, and thus accelerates the mass transfer process between the liquid and solid phases.

[0046] Fourth, an impingement flow buffer zone II-2 is specially provided in the reaction zone II. The buffer zone can slow down or even eliminate the impingement flow state in the reaction zone II, thereby enhancing the separation effect of the three-phase separation zone III.

[0047] Fifth, in the spiral symmetric impinging flow anaerobic reactor system, an exogenous hydrogen storage tank 16 is also provided to adjust the hydrogen partial pressure in the reactor. During the startup or operation phase of the reactor (such as when the system is short of hydrogen or the temperature changes suddenly), the exogenous hydrogen enters the jet tube through the exogenous hydrogen pipe 17 and is "entrained" by the wastewater into the reaction zone II, providing the required hydrogen for the reactor, thereby adjusting the hydrogen partial pressure of the entire reactor. This design ensures the stability of the reactor during the startup and operation phases, effectively reduces accidental risks, and promotes the generation of methane.

[0048] Sixth, the reactor is equipped with a program controller 18, and electric valves are provided on the gas collection pipe 11, the first jet air inlet pipe 5-2, the second jet air inlet pipe 15-2, the third jet air inlet pipe 6-2, the exogenous hydrogen pipe 17 and its branches to control the gas flow. In this way, the gas content can be automatically controlled so that each jet pipe can simultaneously introduce exogenous hydrogen and endogenous biogas as needed, or selectively introduce one of the gases. This can automatically meet the hydrogen partial pressure (1.6 to 10 Pascals) required for the anaerobic digestion system under medium temperature conditions. Within this range, it can avoid the accumulation of intermediate products such as inhibitory volatile fatty acids caused by excessive hydrogen partial pressure, and promote the generation of methane, thereby achieving the simplicity of operation and controllability of the reactor system.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spirally symmetrical impinging flow anaerobic reactor system, characterized in that: The invention comprises a reactor, wherein the reactor is provided with a water distribution zone (I), a reaction zone (II) and a three-phase separation zone (III) from bottom to top, the reaction zone (II) is provided with an impinging flow buffer zone (II-2) and an impinging flow reaction zone (II-1) from bottom to top, the impinging flow buffer zone (II-2) is provided with a plurality of jet tubes distributed from bottom to top, and the jet tubes are supplied with hydrogen and / or biogas.

2. The spirally symmetrical impinging flow anaerobic reactor system according to claim 1, characterized in that: The volume ratio of the impinging flow reaction zone (II-1) to the impinging flow buffer zone (II-2) ranges from 3:1 to 5:

1.

3. The spirally symmetric impinging flow anaerobic reactor system according to claim 2, characterized in that: The jet tubes are provided in three numbers, distributed at 1 / 5 to 3 / 5 of the axial direction of the impact flow reaction zone (II-1) and arranged in a spiral symmetry.

4. The spirally symmetric impinging flow anaerobic reactor system according to claim 3, characterized in that: The ratio of the distance between two adjacent jet tubes to the total length of the impinging flow reaction zone (II-1) is in the range of 1:3 to 1:

5.

5. The spirally symmetric impinging flow anaerobic reactor system according to claim 4, characterized in that: The jet tube has a tangential opening on the impinging flow reaction zone (II-1), and the ratio of the hole diameter d to the diameter D of the impinging flow reaction zone (II-1) is in the range of 1:3 to 1:

10.

6. A spirally symmetric impinging flow anaerobic reactor system according to any one of claims 1 to 5, characterized in that: The water distribution area (I) comprises a bottom valve (1), an inverted cone (2), a support leg (3), and a water inlet pipe (4); the upper surface of the inverted cone (2) is connected to the lower end of the reaction area (II); the reactor is connected to an external hydrogen storage tank (16), a water inlet bucket, a water inlet pump, and a circulation pump; the wastewater in the water inlet bucket is pumped into the water inlet pipe (4) at the top of the water distribution area (I) of the reactor through the water inlet pump; the external hydrogen storage tank (16) is provided with an external hydrogen pipe (17), and the external hydrogen pipe (17) is divided into multiple paths and respectively connected to the jet pipes.

7. The spirally symmetric impinging flow anaerobic reactor system according to claim 6, characterized in that: The circulation pump input port is connected to the three-phase separation zone (III), and the circulation pump output port is connected to the water inlet of the jet tube. The wastewater in the three-phase separation zone (III) flows back to the impact flow area where the jet tube of the reaction zone (II) is located, thereby realizing the partitioned reflux effect.

8. A spirally symmetric impinging flow anaerobic reactor system according to any one of claims 1 to 5, characterized in that: The three-phase separation zone (III) is provided with a short cone (7), an upper column (8) and a cover plate (10) from bottom to top, and a three-phase separation component (9) is provided inside the upper column (8); a water outlet pipe (13) is provided at the upper middle part of the upper column (8), and the cover plate (10) is connected to the upper part of the three-phase separation component (9); the top center position of the three-phase separation component (9) is connected to an endogenous biogas collection pipe (12), and the endogenous biogas collection pipe (12) is divided into multiple paths, which are respectively connected to the gas collection pipe (11) and the plurality of jet pipes.

9. The spirally symmetric impinging flow anaerobic reactor system according to claim 6, characterized in that: When exogenous hydrogen is introduced into the jet tube, the exogenous hydrogen can be driven by the wastewater in the jet tube into the reaction zone (II) to provide the required hydrogen for the reaction zone (II).

10. A spirally symmetric impinging flow anaerobic reactor system according to any one of claims 1 to 5, characterized in that: It also includes a program controller (18), the jet pipe is connected to a gas pipe for supplying hydrogen and biogas, and the gas pipe is provided with an electric valve electrically connected to the program controller (18).

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