CN114409070B - Dual-purpose one-gas double-circulation anaerobic reactor and method thereof - Google Patents
Dual-purpose one-gas double-circulation anaerobic reactor and method thereof Download PDFInfo
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- CN114409070B CN114409070B CN202210104802.1A CN202210104802A CN114409070B CN 114409070 B CN114409070 B CN 114409070B CN 202210104802 A CN202210104802 A CN 202210104802A CN 114409070 B CN114409070 B CN 114409070B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 233
- 239000010865 sewage Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 156
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 82
- 239000007788 liquid Substances 0.000 claims description 70
- 238000013461 design Methods 0.000 claims description 22
- 230000001174 ascending effect Effects 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims 1
- 230000000630 rising effect Effects 0.000 abstract description 6
- 238000012546 transfer Methods 0.000 description 12
- 238000009825 accumulation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a dual-purpose double-circulation anaerobic reactor and a method thereof, which belong to the field of anaerobic sewage treatment, wherein the reactor is provided with a biogas diversion lifting device and a biogas collection device, the internal muddy water of the biogas lifting device forms a density difference from top to bottom in the process of collecting and lifting biogas, the muddy water is lifted to a certain height by taking the density difference generated in the rising process of the biogas as power, and when the lifted muddy water is larger than the water inflow, the muddy water larger than the water inflow part forms a self-circulation A in the local area of the anaerobic reactor; the biogas collecting device uses pressure formed in the biogas collecting process as power to lift muddy water above the water surface of the anaerobic reactor, and the self-circulation B is realized by lifting the backflow of muddy water.
Description
Technical Field
The invention relates to a dual-purpose one-gas double-circulation anaerobic reactor and a method thereof, belonging to the field of anaerobic treatment of sewage.
Background
Good mass transfer is an important link for efficient and stable operation of the anaerobic reactor. At present, the anaerobic reactor mainly improves mass transfer by means of mechanical stirring, slurry external circulation (EGSB process), slurry self-circulation (IC process) and the like. The existing technology for improving the mass transfer of the anaerobic reactor generally has the problems of high energy consumption (such as mechanical stirring, slurry external circulation and the like), harsher design and operation requirements (such as IC technology) of the anaerobic reactor and the like. The development of the anaerobic reactor with high mass transfer and low energy consumption has important significance.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a dual-purpose gas-gas double-circulation anaerobic reactor with high mass transfer and low energy consumption and a method thereof.
The invention aims at realizing the following technical scheme that the reactor comprises a water inlet system, a water distribution system and a water outlet system, and is characterized in that the reactor is also provided with a biogas diversion lifting device with a biogas collecting and lifting function and a biogas collecting device with a mud water lifting function for enabling the mud water to flow back, wherein a gap is reserved between the biogas diversion device and the biogas collecting device; the biogas collecting device utilizes pressure formed in the biogas collecting process as power to lift muddy water above the water surface of the anaerobic reactor, and the self-circulation B is realized by lifting the backflow of the muddy water.
Preferably, the number of the biogas guide devices is several, and the biogas guide devices are distributed in the reactor in parallel; the biogas diversion lifting device comprises a gas collecting hood and a diversion pipe, wherein the diversion pipe is vertically connected above the gas collecting hood; the gas collecting hood is in a shape with a wide bottom and a narrow top, and gradually reduces from bottom to top; the inner wall of the reactor is provided with a first guide vane, a second guide vane is respectively arranged among the biogas guide devices, the first guide vane and the second guide vane are arranged below the biogas guide devices, and the first guide vane and the second guide vane guide generated biogas into the biogas guide lifting device.
Preferably, the biogas collecting device is sequentially provided with a third guide vane, a plurality of three-phase separators, a gas collecting tank and a top water tank from bottom to top, the three-phase separators are arranged in a staggered manner up and down, the third guide vane is arranged on the inner wall of the reactor and is positioned below the three-phase separators, the three-phase separators are respectively provided with a gas/liquid guide pipe, the other ends of the gas/liquid guide pipes are connected with the top of the gas collecting tank, an ascending flow pipe is arranged between the gas collecting tank and the top water tank, one end (inlet) of the ascending flow pipe is arranged at the bottom in the gas collecting tank, the top of the gas collecting tank is provided with an exhaust pipe, an exhaust valve is arranged on the exhaust pipe, the bottom of the top water tank is provided with a descending flow pipe, the other ends of the descending flow pipe are connected with a water distribution system, and the biogas collecting device uses the pressure generated by the collected biogas as power to enable the realization of the backflow.
Preferably, the downflow pipes of the gas collection tank and the top water tank are arranged in the reactor.
Preferably, the downflow pipes of the gas collection tank and the top water tank are arranged outside the reactor.
Preferably, the gas collecting tank is provided with a first liquid level meter and a second liquid level meter along the height direction thereof, the first liquid level meter is positioned at the top of the gas collecting tank, and the automatic opening and closing of the exhaust valve can be realized through the first liquid level meter and the second liquid level meter.
Preferably, the reactor is internally provided with a main reactor design liquid level and a main reactor descending liquid level, the top of the gas collection box is arranged below the main reactor design liquid level, and the bottom of the top water tank is arranged above the main reactor design liquid level; the bottom of the gas collection box is arranged above the top of the upper three-phase separator, so that methane can smoothly enter the gas collection box, and the vertical height (h 1) from the top of the upper three-phase separator to the design liquid level of the main reactor is greater than the vertical height (h 4) of the riser pipe; the vertical height (h 2) between the top of the gas collection box and the designed liquid level of the main reactor is larger than the vertical height (h 3) between the descending liquid level of the main reactor and the designed liquid level of the main reactor when the reactor discharges the same volume of water from the gas collection box, and when the exhaust valve is in an open state, muddy water in the reactor automatically flows into and fills the gas collection box.
A method for a dual-purpose double-circulation anaerobic reactor of one gas, enter sewage into the reactor through the water inlet system and distribute water through the water distribution system, sewage and anaerobic granular sludge in the reactor mix evenly, the biogas produced is guided into the gas-collecting hood through the first guide vane, second guide vane, in the biogas guide lifting process, the muddy water in the biogas guide lifting device forms the density difference from bottom to top, regard density difference formed in the biogas guide device as the power, muddy water in the biogas guide device is lifted, when the water quantity of lifting is greater than the water quantity of inflow of the water inlet system, the muddy water greater than the water quantity of inflow part is in the regional area of the reactor, use the biogas guide device as the center, from inside (rising) to outside (falling), form the self-circulation A;
after gas, liquid and solid are separated in the three-phase separator, the biogas enters the gas collecting tank through the gas/liquid guide pipe, separated liquid flows out from the edge of the three-phase separator, is discharged out of the reactor through the water outlet system, when the exhaust valve of the gas collecting tank is opened, under the action of water level difference, mud water in the reactor naturally flows into and fills the gas collecting tank through the gas/liquid guide pipe, when the mud water fills the gas collecting tank, if the water level reaches a first liquid level timing, the exhaust valve is closed, the biogas flows into and accumulates in the gas collecting tank through the gas/liquid guide pipe, the pressure formed in the biogas accumulation process extrudes and lifts the mud water in the gas collecting tank to the top water tank through the ascending flow pipe, the mud water lifted to the top water tank automatically flows back to the bottom of the reactor through the descending flow pipe, and then the water distribution system evenly distributes water, so that a round of mud water self-circulation B is completed; when the water level in the gas collection box drops to the second liquid level timing, the exhaust valve is opened and closed again to start the self-circulation B of the next round, so that the muddy water self-circulation B is realized.
The invention utilizes marsh gas to realize two self-circulation, firstly, the density difference generated in the process of diversion and lifting marsh gas is used as power, mud water below a marsh gas diversion device is lifted to the outlet of a diversion pipe in a local area of an anaerobic reactor, when the water quantity of the lifted mud water is larger than the water inflow quantity, the mud water larger than the water inflow quantity part forms self-circulation from inside (rising) to outside (falling) in the local area in the anaerobic reactor by taking the marsh gas diversion device as the center, thus realizing the first self-circulation A of the mud water; secondly, the pressure formed in the gas collecting process of the methane in the gas collecting tank is used as power, the muddy water in the gas collecting tank is extruded and lifted to be above the design liquid level of the main reactor, and the second self-circulation B of the muddy water is realized through the lifted backflow of the muddy water.
According to the invention, 2 kinds of muddy water self-circulation power are respectively obtained in the biogas diversion and collection processes, so that the double circulation of the anaerobic reactor is realized, and the gas dual-purpose is realized.
According to the invention, biogas generated by the anaerobic reactor is fully utilized by a gas dual-purpose double-circulation technology, so that the mass transfer effect of the anaerobic reactor is improved.
The invention has the following beneficial effects: the invention takes the density difference generated in the process of diversion and biogas lifting as power, takes a biogas diversion device as a center in a local area in the anaerobic reactor, and realizes the first self-circulation A of muddy water from inside (rising) to outside (falling); the self-circulation A can improve the mud-water mass transfer effect of the local area of the anaerobic reactor, promote the sludge backflow and inhibit the sludge floating by utilizing the descending flow formed in the self-circulation process, and create a powerful condition for the formation of granular sludge by utilizing the high shearing force formed in the flow guide pipe.
According to the invention, the pressure formed in the biogas collection process is used as power, muddy water in the gas collection tank is extruded and lifted to be above the design liquid level of the main reactor, the second self-circulation B is realized through the backflow of the lifted muddy water, the self-circulation B further improves the mass transfer effect of the anaerobic reactor, the self-circulation water quantity is related to the total gas yield, the influence of the gas production intensity is avoided, and the biogas utilization efficiency is high; compared with the traditional IC reactor, the invention has no harsh design requirement on the self-circulation of the anaerobic reactor, can realize the self-circulation of muddy water in the anaerobic reactor with low height-diameter ratio, and has stable operation.
The dual-purpose double-circulation technology of gas fully utilizes the biogas generated by the anaerobic reactor, improves the biogas utilization efficiency, and creates favorable conditions for the efficient and stable operation of the anaerobic reactor under the condition of no need of adding extra energy consumption.
The invention has simple structure and convenient use, the invention has not harsh requirement on the height-diameter ratio of the anaerobic reactor, can realize the self-circulation of the muddy water in the anaerobic reactor with low height-diameter ratio, has good application prospect in anaerobic sewage treatment, takes the density difference generated in the process of diversion and biogas lifting as power, realizes the first self-circulation A of the muddy water in a local area in the anaerobic reactor, improves the sedimentation velocity of the muddy water and improves the mass transfer effect; the pressure formed in the biogas collecting process is used as power, the muddy water is extruded and lifted to be above the liquid level of the main reactor, and the second self-circulation B is realized through the lifted backflow of the muddy water, so that the muddy water mass transfer effect is further improved. The biogas (one gas is used for two purposes) is fully utilized, the operation condition of the anaerobic reactor is optimized, technical support is provided for the efficient and stable operation of the anaerobic reactor, and the energy consumption is low.
Drawings
FIG. 1 is a schematic view of the structure of the gas collection tank and the top water tank in the reactor.
FIG. 2 is a schematic view of the structure of the gas collection tank and the top water tank outside the reactor.
In the figure: 1 water inlet system, 2 water distribution system, 3 downdraft tube, 4 first guide vane, 5 second guide vane, 6 gas collecting hood, 7 three-phase separator, 8 gas/liquid guide tube, 9 updraft tube, 10 gas collecting box, 11 third guide vane, 12 water outlet system, 13 exhaust pipe, 14 guide tube, 15 top water tank, 16 exhaust valve, 17 first liquid level meter, 18 second liquid level meter, 19 main reactor design liquid level, 20 main reactor descending liquid level.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, the dual-purpose double-circulation anaerobic reactor for gas comprises a water inlet system 1, a water distribution system 2 and a water outlet system 12, wherein the reactor is also provided with a methane diversion lifting device with the functions of collecting and lifting methane and a methane collecting device with the function of lifting muddy water to enable muddy water to flow back, the methane diversion device is positioned below the methane collecting device, a gap is reserved between the methane diversion device and the methane collecting device, the inside muddy water of the methane lifting device forms a density difference from top to bottom in the process of collecting and lifting methane, the muddy water is lifted to a certain height by using the density difference generated in the methane lifting process as power, and when the lifted muddy water is larger than the water inflow, the muddy water larger than the water inflow part forms a self-circulation A in a local area of the anaerobic reactor; the biogas collecting device utilizes pressure formed in the biogas collecting process as power to lift muddy water above the water surface of the anaerobic reactor, and the self-circulation B is realized by lifting the backflow of the muddy water.
The invention discloses a gas dual-purpose double-circulation anaerobic reactor, which comprises a water inlet system 1, a water distribution system 2, a water outlet system 12, a plurality of biogas guide lifting devices, a three-phase separator 7, a gas collecting box 10, a gas/liquid guide pipe 8, an exhaust pipe 13, an exhaust valve 16, an updraft pipe 9, a top water tank 15 and a downdraft pipe 3, wherein the gas/liquid guide pipe 8, the exhaust pipe 13, the exhaust valve 16, the updraft pipe 9 and the top water tank 15 are connected with the gas collecting box 10.
The reactor is sequentially provided with a plurality of biogas diversion lifting devices, a three-phase separator 7, a gas collecting tank 10 and a top water tank 15 from bottom to top, the plurality of diversion lifting devices are distributed in parallel, the biogas diversion lifting devices comprise a gas collecting hood 6 and a diversion pipe 14, the upper part of the gas collecting hood 6 is vertically connected with the diversion pipe 14, the outlet of the diversion pipe 14 is arranged below the three-phase separator 7, a gap is reserved between the gas collecting hood 6 and the three-phase separator 7, the gas collecting hood 6 is in a shape of being wide at the bottom and narrow at the top and gradually reduced from bottom to top, the inner wall of the reactor is provided with a first diversion sheet 4, a second diversion sheet 5 is respectively arranged between the plurality of diversion devices, and the first diversion sheet 4 and the second diversion sheet 5 are all arranged below the biogas diversion lifting devices; the biogas under the gas collecting hood 6 is guided into the gas collecting hood 6 by using a first guide vane 4 and a second guide vane 5 which are arranged under the gas collecting hood 6, and in the biogas guiding and lifting process, the muddy water in the biogas guiding and lifting device forms a density difference from top to bottom; the density difference formed in the biogas guide device is used as power, mud water in the biogas guide device is lifted, and when the lifted water quantity is larger than the water inflow quantity, the biogas guide device is used as the center, and a self-circulation A is formed in a local area of the anaerobic reactor.
Further, the mud lifting efficiency of the biogas guiding device is related to the pipe diameter of the guiding pipe 14, the vertical height and the area of the gas collecting channel 6, and when the pipe diameter of the guiding pipe 14 is smaller, the vertical height is higher, and the area of the bottom of the gas collecting channel 6 is larger, the mud lifting efficiency is higher, and vice versa.
As shown in fig. 1, the biogas collecting device is sequentially provided with a third guide vane 11, a plurality of three-phase separators 7, a gas collecting tank 10 and a top water tank 15 from bottom to top in the reactor, the three-phase separators 7 are arranged in a staggered manner up and down, the third guide vane 11 is arranged on the inner wall of the reactor and positioned below the three-phase separators 7, the three-phase separators 7 are respectively provided with a gas/liquid guide pipe 8, the other ends of the gas/liquid guide pipes 8 are connected with the top of the gas collecting tank 10, an ascending flow pipe 9 is arranged between the gas collecting tank 10 and the top water tank 15, one end (inlet) of the ascending flow pipe 9 is arranged at the inner bottom of the gas collecting tank 10, the top of the gas collecting tank 10 is provided with an exhaust pipe 13, the exhaust pipe 13 is provided with an exhaust valve 16, the bottom of the top water tank 15 is provided with a downflow pipe 3, and the other ends of the downflow pipe 3 are connected with the water distribution system 2, and the water distribution is uniform.
As shown in fig. 2, the biogas collecting device is sequentially provided with a third guide vane 11, a plurality of three-phase separators 7, a gas collecting box 10 and a top water tank 15 from bottom to top in the reactor, the three-phase separators 7 are arranged in a staggered manner up and down, the third guide vane 11 is arranged on the inner wall of the reactor and is positioned below the three-phase separators 7, the three-phase separators 7 are respectively provided with a gas/liquid guide pipe 8, the gas outlets of the gas/liquid guide pipes 8 are connected with the gas collecting box 10, and the biogas generated by the anaerobic reactor enters the gas collecting box 10 after being separated by gas, liquid and solid in the three-phase separators 7. The vertical height of the outer side of the reactor is sequentially from bottom to top, namely a gas collection box 10 and a top water tank 15, the gas collection box 10 is connected with the top water tank 15 through a rising flow pipe 9, and one end (inlet) of the rising flow pipe 9 is arranged near the bottom in the gas collection box 10; an exhaust pipe 13 is connected above the gas collection box 10, and an exhaust valve 16 is arranged on the exhaust pipe 13; the top water tank 15 is connected with the reactor through a downflow pipe 3, one end of the downflow pipe 3 is connected to the near bottom of the reactor, and water is uniformly distributed.
Further, the size of the downflow pipe 3 pipe diameter meets the requirement that the muddy water of the top water tank 15 can smoothly flow back.
Further, the top of the gas collection tank 10 is disposed below the main reactor design liquid level 19, the bottom of the top water tank 15 is disposed above the main reactor design liquid level 19, the bottom of the gas collection tank 10 is disposed above the top of the upper three-phase separator 7, and the vertical height (h 1) (see the figure) from the top of the upper three-phase separator 7 to the main reactor design liquid level 19 should be greater than the vertical height (h 4) of the updraft tube 9, h1> h4. The purpose is that: firstly, the biogas generated by the reactor is prevented from accumulating in the three-phase separator 7 or overflowing from the base of the three-phase separator 7; secondly, the biogas generated in the anaerobic reactor is ensured to be entirely introduced into the gas collection tank 10.
In order to ensure that when the exhaust valve 16 of the gas collection tank 10 is opened, the muddy water of the reactor automatically flows into the gas collection tank 10 and is topped up, and the vertical height (h 2) (see the figure) between the top of the gas collection tank 10 and the design liquid level 19 of the main reactor is larger than the vertical height h3, h2> h3 between the descending liquid level 20 of the main reactor and the design liquid level 19 of the main reactor when the same volume of water of the gas collection tank 10 is discharged from the reactor.
When the exhaust valve 16 is opened, the muddy water of the reactor naturally flows into and fills the gas collection tank 10 under the action of the water head.
When the exhaust valve 16 is in the closed state, biogas from the reactor flows into and accumulates in the header tank 10. The pressure formed in the biogas accumulation process extrudes and lifts the muddy water in the gas collection tank 10 to the top water tank 15 through the upflow pipe 9.
The muddy water lifted to the top water tank 15 automatically flows back to the bottom of the reactor through the downflow pipe 3, so that the muddy water self-circulation B is realized.
By controlling the water level difference among the reactor, the gas collection tank 10 and the top water tank 15, the mud water flow state among the three is controlled to be unidirectional flow. If the reactor muddy water flows into the gas collection tank 10, the muddy water of the gas collection tank 10 is extruded and lifted to the top water tank 15, and the muddy water of the top water tank 15 flows back into the reactor.
In summary, the invention uses the pressure generated in the biogas accumulation process as power, and realizes the self-circulation B of muddy water in the anaerobic reactor.
Example 1
The specification and the installation of the gas collection box 10 and the top water tank 15 are in accordance with the design requirements, the muddy water generates methane in the mass transfer process, the muddy water in the methane diversion lifting device is changed from bottom to top to form a density difference from top to bottom, the density difference provides power for the muddy water lifting in the methane diversion device, the lifted water quantity is larger than the water inflow, the methane diversion device is taken as the center, a self-circulation A is formed in a local area of the anaerobic reactor, the muddy water lifting efficiency of the methane diversion device is related to the pipe diameter and the vertical height of the diversion pipe 14 and the area of the bottom of the gas collection cover 10, the muddy water lifting efficiency can be improved by reducing the pipe diameter of the diversion pipe 14, heightening the vertical height, enlarging the area of the bottom of the gas collection cover 6 and the like, and the pipe diameter (more than 3.0 cm) of the diversion pipe 14 is not suitable to be too small so as to prevent blockage;
the self-circulation B is provided with a first liquid level meter 17 and a second liquid level meter 18 along the height direction of the gas collecting tank 10, and the specific working procedures are as follows: firstly, an exhaust valve 16 is opened, under the action of water level difference, mud water of the reactor naturally flows into the gas collecting tank 10, and when the water level of the gas collecting tank 10 reaches the height of a first liquid level meter 17, the exhaust valve 16 is closed, and mud water stops flowing; when the exhaust valve 16 is kept in a closed state, biogas generated by the reactor flows into and accumulates in the gas collecting tank 10, the pressure formed in the biogas accumulation process extrudes and lifts muddy water in the gas collecting tank 10 to the top water tank 15 through the ascending flow pipe 9, one round of self-circulation B is completed through the backflow of the lifted muddy water, and when the water level of the gas collecting tank 10 drops to the height of the second liquid level meter 18, the exhaust valve 16 is opened and closed again, so that the muddy water self-circulation B of the next round is realized.
Example 2
The specification and the installation of the gas collection tank 10 and the top water tank 15 are in accordance with the design requirements, the muddy water generates methane in the mass transfer process, the muddy water in the methane diversion lifting device is changed from bottom to top to form a density difference from top to bottom, the density difference provides power for the muddy water lifting in the methane diversion device, the lifted water quantity is larger than the water inflow, the methane diversion device is taken as the center, a self-circulation A is formed in a local area of the anaerobic reactor, the muddy water lifting efficiency of the methane diversion device is related to the pipe diameter and the vertical height of the diversion pipe 14 and the bottom area of the gas collection cover 6, the muddy water lifting efficiency can be improved by reducing the pipe diameter of the diversion pipe 14, heightening the vertical height, increasing the bottom area of the gas collection cover 6 and the like, and the pipe diameter (more than 3.0 cm) of the diversion pipe 14 is not suitable to be too small so as to prevent blockage;
self-circulation B, according to the gas production condition of the reactor, discharging methane at certain time intervals; the exhaust valve 16 is controlled manually according to the volume of methane in the gas collection tank 10. By strictly controlling the vertical heights of the three-phase separator 7, the gas collecting tank 10 and the top water tank 15, such as h1> h4, h2> h3, the top water tank is arranged above the designed liquid level of the reactor, and the like, the water flow of the self-circulation B is unidirectional, namely the muddy water of the reactor naturally flows into the gas collecting tank 10, the muddy water in the gas collecting tank 10 is extruded and lifted to the top water tank 15, the muddy water of the top water tank 15 flows back into the reactor, and the muddy water can not flow back among the three.
A method for a dual-purpose double-circulation anaerobic reactor of one gas, enter the reactor through the water inlet system 1 and distribute water through the water distribution system 2 evenly, sewage and anaerobic granular sludge in the reactor mix evenly, the biogas produced is guided into the gas-collecting hood 6 through the first guide vane 4, second guide vane 5, in the biogas guide lifting process, the muddy water in the biogas guide lifting device forms the density difference from bottom to top, regard density difference formed in the biogas guide device as the power, muddy water in the biogas guide device is lifted, when the water quantity that promotes is greater than the water quantity that intakes of the water inlet system 1, the muddy water that is greater than the water quantity part of intakes is in the regional area of the reactor, regard biogas guide device as the center, form the self-circulation A from inside to outside;
after the biogas generated by the reactor is separated from gas, liquid and solid in the three-phase separator 7 by the third guide vane 11, the biogas enters the gas collecting tank 10 by the gas/liquid guide pipe 8, separated liquid flows out from the edge of the three-phase separator 7 and is discharged out of the reactor by the water outlet system 12, and when the exhaust valve 16 of the gas collecting tank 10 is opened, the muddy water of the reactor naturally flows into and fills the gas collecting tank 10 under the action of water head; when the muddy water fills the gas collecting tank 10, the exhaust valve 16 is closed, the marsh gas flows into and accumulates in the gas collecting tank 10 through the gas/liquid guide pipe 8, the muddy water in the gas collecting tank 10 is extruded and lifted to the top water tank 15 through the ascending flow pipe 9 by the pressure formed in the marsh gas accumulation process, the muddy water lifted to the top water tank 15 automatically flows back to the bottom of the reactor through the descending flow pipe 3, and then the muddy water is uniformly distributed through the water distribution system 2, so that a round of muddy water self-circulation B is formed; when the water level in the gas collection tank 10 drops to the second level gauge 18, the self-circulation B of the muddy water is started for the next round by re-opening and closing the exhaust valve 16.
The foregoing description is only a preferred embodiment of the present invention, but is not intended to limit the present invention, and one skilled in the art may make possible variations and modifications to the present invention or modify equivalent embodiments with the technical content disclosed above without departing from the scope of the technical solution of the present invention, and any simple modifications, equivalent variations and modifications made to the above embodiments according to the technical substance of the present invention fall within the scope of the technical solution of the present invention.
Claims (6)
1. The double-circulation anaerobic reactor for one gas comprises a water inlet system (1), a water distribution system (2) and a water outlet system (12), and is characterized in that the reactor is also provided with a methane diversion lifting device with a methane collecting and lifting function and a methane collecting device with a function of lifting muddy water to enable muddy water to flow back, the methane diversion device is positioned below the methane collecting device and is provided with a gap between the methane diversion device and the methane collecting device, the inside muddy water of the methane lifting device forms a density difference from top to bottom in the methane collecting and lifting process, the muddy water is lifted to a certain height by using the density difference generated in the methane lifting process as power, and when the lifted muddy water is larger than the water inflow, the muddy water larger than the muddy water inflow part forms a self-circulation A in a local area of the anaerobic reactor; the biogas collecting device utilizes pressure formed in the biogas collecting process as power to lift muddy water above the water surface of the anaerobic reactor, and the self-circulation B is realized by lifting the backflow of muddy water;
the biogas collection device is sequentially provided with a third guide vane (11), a plurality of three-phase separators (7), a gas collection box (10) and a top water tank (15) from bottom to top, wherein the three-phase separators (7) are arranged in a staggered manner up and down, the third guide vane (11) is arranged on the inner wall of the reactor and positioned below the three-phase separators (7), the three-phase separators (7) are respectively provided with a gas/liquid guide pipe (8), the other ends of the gas/liquid guide pipes (8) are connected with the top of the gas collection box (10), an ascending pipe (9) is arranged between the gas collection box (10) and the top water tank (15), one end of the ascending pipe (9) is arranged at the inner bottom of the gas collection box (10), the top of the gas collection box (10) is provided with an exhaust pipe (13), the bottom of the top water tank (15) is provided with a descending pipe (3), and the other ends of the descending pipe (3) are connected with a water distribution system (2);
the biogas guide devices are distributed in the reactor in parallel; the biogas diversion lifting device comprises a gas collecting hood (6) and a diversion pipe (14), wherein the diversion pipe (14) is vertically connected above the gas collecting hood (6);
the gas collecting hood (6) is in a shape with a wide bottom and a narrow top, and gradually reduces from bottom to top;
the reactor is internally provided with a main reactor design liquid level (19) and a main reactor descending liquid level (20), the top of the gas collection box (10) is arranged below the main reactor design liquid level (19), and the bottom of the top water tank (15) is arranged above the main reactor design liquid level (19); the bottom of the gas collection box (10) is arranged above the top of the upper three-phase separator (7), and the vertical height from the top of the upper three-phase separator (7) to the design liquid level (19) of the main reactor is greater than the vertical height of the upflow pipe (9); the vertical height of the top of the gas collection tank (10) and the design liquid level (19) of the main reactor is larger than the vertical height of the descending liquid level (20) of the main reactor and the design liquid level (19) of the main reactor when the reactor discharges the same volume of water from the gas collection tank (10).
2. The dual-purpose double-circulation anaerobic reactor for gas according to claim 1, wherein the inner wall of the reactor is provided with a first guide vane (4), second guide vanes (5) are respectively arranged among the biogas guide devices, and the first guide vane (4) and the second guide vane (5) are both arranged below the biogas guide devices.
3. A dual-purpose anaerobic reactor according to claim 1, wherein the gas collection tank (10) and the downtake (3) of the top tank (15) are arranged in the reactor.
4. A dual-purpose anaerobic reactor according to claim 1, wherein the gas collection tank (10) and the downcomers (3) of the top water tank (15) are arranged outside the reactor.
5. The dual-purpose double-circulation anaerobic reactor for gas according to claim 1, wherein the gas collection tank (10) is respectively provided with a first liquid level meter (17) and a second liquid level meter (18) along the height direction, and the first liquid level meter (17) is positioned at the top of the gas collection tank (10).
6. A method for utilizing the dual-purpose double-circulation anaerobic reactor of any one of claims 1-5, which is characterized in that sewage enters the reactor through a water inlet system (1) and is uniformly distributed through a water distribution system (2), the sewage is uniformly mixed with anaerobic granular sludge in the reactor, the generated biogas is guided into a gas collecting hood (6) through a first guide vane (4) and a second guide vane (5), in the biogas guiding and lifting process, the muddy water in a biogas guiding and lifting device forms a density difference from bottom to top, the density difference formed in the biogas guiding device is taken as power, the muddy water in the biogas guiding device is lifted, when the water quantity of lifting is larger than the water quantity of water inlet of the water inlet system (1), the muddy water in a part of the reactor is in a local area with the biogas guiding device as a center, and a self-circulation A is formed from inside to outside;
after the biogas generated by the reactor passes through a third guide vane (11) and is subjected to gas, liquid and solid separation in a three-phase separator (7), the biogas enters a gas collecting tank (10) through a gas/liquid guide pipe (8), separated liquid flows out from the edge of the three-phase separator (7) and is discharged out of the reactor through a water outlet system (12), and when an exhaust valve (16) of the gas collecting tank (10) is opened, the muddy water of the reactor naturally flows into and fills the gas collecting tank (10) under the action of water level difference; when the muddy water fills the gas collection tank (10), the exhaust valve (16) is closed, the marsh gas flows into and accumulates in the gas collection tank (10) through the gas/liquid guide pipe (8), the muddy water in the gas collection tank (10) is extruded and lifted to the top water tank (15) through the ascending flow pipe (9), the muddy water lifted to the top water tank (15) automatically flows back to the bottom of the reactor through the descending flow pipe (3), and then is uniformly distributed through the water distribution system (2), so that a round of muddy water self-circulation B is completed; when the water level in the gas collection tank (10) drops to the second liquid level meter (18), the exhaust valve (16) is opened and closed again, and the self-circulation B of the next round is started, so that the muddy water self-circulation B is realized.
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