High-concentration vertical anaerobic fermentation device

Abstract

The utility model relates to the field of anaerobic fermentation of organic wastes, and discloses a high-concentration vertical anaerobic fermentation device which comprises an anaerobic fermentation reactor, the feeding unit is connected with a feeding hole of the anaerobic fermentation reactor; the gas-phase gas outlet unit is connected with a gas-phase gas outlet of the anaerobic fermentation reactor; the solid-liquid phase discharging unit is connected with a solid-liquid phase discharging hole of the anaerobic fermentation reactor; the internal circulation unit is connected with a solid-liquid phase circulation port of the anaerobic fermentation reactor; the temperature increasing and heat preservation unit comprises a heat supply source, a heat supply pipe A connected with the heat supply source and the bottom of the anaerobic fermentation reactor, and a heat supply pipe B connected with the mixing container and the heat supply source. According to the utility model, the inoculation time of the material is greatly shortened, the full contact between the strain and the material is enhanced, the methane production stage of anaerobic fermentation is accelerated, the methane conversion of the material is quickly realized, the conversion efficiency of the reactor is improved, the retention time of the material is shortened, meanwhile, mechanical stirring is not needed, and the energy consumption is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of anaerobic fermentation of waste containing solid fibrous organic matter, such as agricultural straw, organic household waste, garden waste, livestock and poultry manure, and kitchen waste, and particularly to a high-concentration vertical anaerobic fermentation device. Background Technology

[0002] Anaerobic fermentation for biogas production is an important method for treating agricultural, livestock, and industrial organic waste. Fermentation types are generally categorized by the dry matter content of the raw materials: wet fermentation (8-12% or less) and high-concentration anaerobic fermentation (15% or more). Currently, wet anaerobic fermentation technology is widely used in biogas projects due to its maturity. However, with the implementation of large-scale biogas projects, problems such as high energy consumption, large biogas slurry production with difficulties in disposal, and low volumetric yield have emerged. Compared to wet anaerobic fermentation, high-concentration anaerobic fermentation can handle higher feed organic loads and larger daily feed volumes, while reducing fermenter volume, achieving higher gas production efficiency, lower biogas slurry discharge, and lower operating costs, thus showing broad development prospects. High-concentration anaerobic fermentation technology, especially dry anaerobic fermentation, was applied earlier abroad, with continuous fermentation systems such as Valorga (France), Dranco (Belgium), and Kompogas (Switzerland); and sequencing batch fermentation systems such as Bekon, Bioferm, Eisenmann, and LARAN (Germany). The domestic anaerobic high-concentration fermentation technology is in its initial stage. Currently, most projects directly import foreign technology and equipment, resulting in poor localization and conversion capabilities.

[0003] With the advancement and in-depth research of high-concentration anaerobic fermentation engineering, it has been found that high-concentration anaerobic fermentation contains high dry matter content and poor fluidity, resulting in low conversion rate and uneven mass transfer. This can easily lead to severe local acidification or ammonia nitrogen accumulation, thereby inhibiting the activity of methanogens and causing instability of the anaerobic system. Summary of the Invention

[0004] To address the problems mentioned in the background section regarding the high dry matter content, poor fluidity, low conversion rate, uneven mass transfer, and anaerobic system imbalance in traditional anaerobic fermentation of solid fibrous organic waste from agriculture, animal husbandry, and industry, a high-concentration vertical anaerobic fermentation device is provided.

[0005] The specific technical solution of this utility model is as follows:

[0006] A high-concentration vertical anaerobic fermentation device includes:

[0007] Anaerobic fermentation reactor;

[0008] A feeding unit connected to the feed inlet of the anaerobic fermentation reactor;

[0009] A gas phase outlet unit connected with a gas phase outlet of the anaerobic fermentation reactor;

[0010] A solid-liquid phase discharge unit connected with a solid-liquid phase discharge port of the anaerobic fermentation reactor;

[0011] An internal circulation unit connected with a solid-liquid phase circulation port of the anaerobic fermentation reactor;

[0012] A temperature increasing and maintaining unit comprising a heat supply source, a heat supply pipe A connecting the heat supply source and the bottom of the anaerobic fermentation reactor, and a heat supply pipe B connecting the mixing container and the heat supply source.

[0013] After the material is mixed, it is pumped into the anaerobic reactor through the circulation pipe C and the pipeline, and sequentially passes through the hydrolysis zone, the acidification zone, and then the methanogenic zone for methanogenic conversion from top to bottom. The undigested solid phase in the acidification zone and the methanogenic zone returns to the top of the anaerobic fermentation reactor through the internal circulation pipe for re-hydrolysis and digestion. The material in the fermentation reactor presents a ladder according to the density, and is adjusted by the internal rotating ring pump at the bottom.

[0014] Preferably, the bottom of the anaerobic fermentation reactor is inverted conical to avoid material accumulation at the bottom, causing waste and cleaning dead angles.

[0015] Preferably, the storage bin is located directly above the mixing container to facilitate uniform feeding of the mixing container.

[0016] Preferably, the mixing container adopts a steel plate assembled van structure, which is easy to disassemble and has strong load-bearing capacity. The bottom plate of the mixing container is provided with a slope to facilitate smooth discharge of the mixed material. The mixing container returns to the mixing container through the circulation pipe C pump and the pipeline to ensure that the reflux liquid and the new material are fully mixed.

[0017] The anaerobic fermentation reactor is sequentially divided into a hydrolysis zone, an acidification zone, and a methanogenic zone from top to bottom. The heat supply pipe A supplies heat to the methanogenic zone at the lower part of the anaerobic fermentation reactor, and the heat supply source only supplies heat to the mixing container and the methanogenic zone, i.e., only to the feeding unit and the methanogenic stage. This not only improves the conversion rate of the device, but also saves resources and improves efficiency. Meanwhile, the hydrolysis zone, the acidification zone, and the methanogenic zone are communicated without intermediate blockage, and the reaction progress is controlled by controlling the mixing ratio, the internal circulation pipe, the circulation pipe, etc. to improve the efficiency.

[0018] The feeding unit comprises a mixing container and a storage bin for feeding the mixing container. The mixing container is connected with the anaerobic fermentation reactor through a feeding pipe to connect the feeding unit with the anaerobic fermentation reactor and ensure the supply of material.

[0019] Preferably, the feeding port is connected with the material distribution device to simultaneously feed through the three feeding pipes at the top of the fermentation tank.

[0020] The feeding pipe is connected with an internal circulation pipe, the upstream of the internal circulation pipe is connected with the circulation pipe A and the circulation pipe B respectively, the mixed product of hydrolysis, acidification and the like is passed through the internal circulation pipe from the hydrolysis zone and the acidification zone of the anaerobic fermentation reactor downward, the liquid phase returns to the lower part of the tank body from top to bottom, an internal circulation system is formed, the hydrolysis and acidification intensity of the material is promoted, the methane production stage of the anaerobic fermentation is accelerated, the material realizes methane conversion rapidly, the conversion efficiency of the reactor is improved, and the residence time of the material is shortened.

[0021] The solid-liquid phase discharging unit comprises a screw discharging port connected with a solid-liquid phase discharging port in the middle and lower part of the anaerobic fermentation reactor and a slag discharging port in the bottom of the anaerobic reactor. The screw discharging port can control the discharging speed by the speed of the screw, facilitate the subsequent system processing, the solid-liquid material slag is separated by the solid-liquid separation system, the solid slag and the filtrate are subjected to environmental protection treatment with the sand in the bottom of the reactor, and green production is achieved.

[0022] The discharging pipe is connected with a reflux pipe, one end of the reflux pipe away from the discharging pipe is connected with the top of the mixing container, the incompletely digested material is entered into the mixing container through the reflux pipe, the fresh material and the incompletely digested material and the like are mixed into the batching bin, and then are entered into the reaction device from the top of the fermentation tank through the feeding pipe, so that the inoculation time of the material is shortened and the hydrolysis and acidification stage of the material is accelerated.

[0023] Preferably, a material uniformizing device is installed at the top of the fermentation tank, so as to avoid material accumulation and improve the mass transfer performance of the material.

[0024] A circulation pipe C is arranged on the mixing container and communicates the bottom and the top of the mixing container, so as to accelerate the mixing rate of the mixing container.

[0025] The gas phase gas discharging unit comprises a gas discharging pipe connected with a gas phase gas discharging port in the top of the anaerobic fermentation reactor and a pressure sensing device installed on the gas discharging pipe. The density of the fermentation gas is smaller than that of air. Under normal circumstances, the fermentation gas should be gathered in the uppermost end of the anaerobic fermentation reactor, and the gas phase gas discharging port is located at the top end of the reactor, which is beneficial to the complete collection of the fermentation gas. At the same time, the establishment of the pressure sensing device can enable the operator to detect the internal pressure of the reactor at any time, thereby improving the safety of operation.

[0026] Preferably, the pressure sensing device is installed near the gas phase gas discharging port, so as to detect the pressure change in the reactor in time.

[0027] Preferably, a biogas purification and utilization system is connected with the outside of the gas discharging pipe, so as to directly output products and reduce energy consumption.

[0028] Preferably, a methane production zone of the anaerobic fermentation reactor is provided with a liquid level detection port, so as to facilitate the staff to detect the liquid surface position of the anaerobic fermentation reactor in time and make reasonable operation.

[0029] Preferably, the liquid level detection port is located in the lower part of the middle of the anaerobic fermentation reactor.

[0030] The anaerobic fermentation reactor is provided with a pH detection port and a temperature detection port; the mixing container is provided with a temperature detection port, so that the pH value and the temperature of the anaerobic fermentation reactor can be detected in time, the real-time progress of the reaction in the tank is known, and the safety of the whole device is enhanced.

[0031] Preferably, the anaerobic fermentation reactor is provided with multiple sets of pH detection ports and temperature detection ports; since the anaerobic fermentation reactor is too large, the temperature and the pH in the reactor are not uniform, and the pH detection ports and the temperature detection ports are arranged in different regions, so that the change conditions of the temperature and the pH in different regions can be better known, and the feeding ratio in the next stage can be arranged in time.

[0032] Preferably, a PID automatic control system is arranged, the mixing ratio of various raw materials in the device can be accurately controlled through the PID automatic control system, the running value range and the early warning value parameters of feeding, reflux, internal circulation, discharging and the like are controlled, and the PID automatic control system is connected with online instruments such as a liquid level meter, a thermometer, a pressure gauge, a pH meter and a biogas analyzer in the device, so that the normal operation of the high-concentration anaerobic fermentation system is ensured. Furthermore, through anaerobic fermentation ADM1 kinetics analysis, model fitting analysis on the residence time of each stage of anaerobic fermentation and the anaerobic high-concentration fermentation reaction time can be carried out, and further parameter optimization can be sought.

[0033] Compared with the prior art, the device has the following beneficial effects:

[0034] 1. The design of two circulating systems in the device can improve the conversion rate of materials, reduce solid-phase and liquid-phase output, and ensure efficient operation of the anaerobic system.

[0035] 2. The addition of the temperature increasing and preserving unit can control the reaction temperature of the whole system at the most suitable temperature for hydrolysis acidification and methanogenic bacteria, reduce heat source supply and heat source loss, and improve the economic benefit of the whole anaerobic fermentation system.

[0036] 3. The mixing container, the main reactor, the temperature increasing and preserving system, the biogas treatment system and the solid-liquid separation system are combined with each other and applied to anaerobic fermentation of fiber-based organic waste, so that a high-efficiency vertical anaerobic fermentation integrated device is provided.

[0037] 4. The device can be applied to various cellulose-containing solid-phase organic waste, has high volumetric gas production rate, high feeding and fermentation concentration, and small biogas slurry production, and can greatly reduce the problem of subsequent treatment of biogas slurry. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a process schematic diagram of the device.

[0039] Figure 2 is a schematic diagram of an anaerobic fermentation reaction tank of the device.

[0040] Figure 3 is a top view of the anaerobic fermentation reaction tank.

[0041] The reference signs are: 1, anaerobic fermentation reactor; 111, hydrolysis zone; 112, acidification zone; 113, methanogenesis zone; 12, reflux pipe; 13, discharge pipe; 14, internal circulation outlet A; 15, internal circulation pipe; 16, liquid level detection port; 17, pH detection port; 18, temperature detection port; 19, internal circulation outlet B; 21, mixing container; 22, storage bin; 23, feeding port; 24 feeding pipe; 31, gas phase gas outlet; 32, pressure sensing device interface; 33, biogas sampling interface; 41, residue discharge port; 42, solid-liquid phase discharge port; 43, discharge screw port; 51, heat supply source; 5111, heat supply pipe A inlet pipe; 5112, heat supply pipe A outlet pipe; 5121, heat supply pipe B inlet pipe; 5122, heat supply pipe B outlet pipe; 6, solid-liquid separation system; 71, highest liquid level line; 72, lowest liquid level line; 81, circulation pipe C pump; 821, internal circulation pump A; 822, internal circulation pump B; 83, discharge pump; 9, biogas purification and utilization system; 101, circulation pipe A; 102, circulation pipe B; 103, circulation pipe C. DETAILED DESCRIPTION

[0042] The utility model will be further described below in combination with examples. The devices, connection structures and methods involved in the utility model are all devices, connection structures and methods known in the art if not specified.

[0043] Example 1

[0044] As Figure 1As shown: anaerobic fermentation reactor 1 inside the main body is divided into hydrolysis zone 111, acidification zone 112 and methanogenic zone 113 three regions from top to bottom. Anaerobic fermentation reactor 1 has a gas phase gas outlet 31, the gas phase gas outlet 31 is connected with the gas outlet pipe, the gas outlet pipe is provided with pressure sensing device interface on the side close to the gas phase gas outlet 31, and is provided with pressure sensing device, the other side of the gas outlet pipe is connected with biogas purification and utilization system 9. The acidification zone is provided with a circulating pipe A101 which is connected with the internal circulation outlet A14 provided on the anaerobic fermentation reactor 1 and extends into the anaerobic fermentation reactor 1; the methanogenic zone is provided with a circulating pipe B102 which is connected with the internal circulation outlet B19 provided on the anaerobic fermentation reactor 1 and extends into the anaerobic fermentation reactor 1; the circulating pipe A101 and the circulating pipe B102 are connected with the internal circulation pipe 15, and an internal circulation pump A821 is arranged on the internal circulation pipe 15, so that the feeding material is re-fed into the device for fermentation by being connected with the feeding pipe 24. In the feeding unit, a mixing container 21 with a slope at the bottom is arranged, a storage bin 22 is arranged above the mixing container 21, the mixing container 21 is connected with the feeding pipe 24, a circulating pipe C pump 81 is arranged on the feeding pipe 24, and the feeding pipe 24 is directly connected with the feeding inlet 23 at the top end of the anaerobic fermentation reactor 1. The bottom end of the anaerobic fermentation reactor 1 is provided with a slag discharge port 41 and a solid-liquid phase discharge port 42, the solid-liquid phase discharge port 42 is directly connected with a discharge screw port 43, the discharge screw port 43 is directly connected with a backflow pipe 12 and a discharge pipe 13 through a discharge pump 83, the end of the discharge pipe 13 away from the discharge pump 83 is directly connected with a solid-liquid separation system 6, and the end of the backflow pipe 12 away from the discharge pump 83 is connected with the middle part of the mixing container 21, so that the fermentation mixed solid-liquid phase product is transported into the mixing container 21 through the backflow pipe 12 by a backflow pump, and re-enters the fermentation system. A heat supply source 51 is arranged beside the anaerobic fermentation reactor 1, the heat supply source 51 is connected with a heat supply pipe A inlet pipe 5111 located in the methanogenic zone 113 of the anaerobic fermentation reactor 1, the heat supply pipe A outlet pipe 5112 located below the heat supply pipe A inlet pipe 5111 is connected back to the heat supply source 51, the heat supply source 51 is connected with a heat supply pipe B inlet pipe 5121 located at the bottom of the anaerobic fermentation reactor 1, and the heat supply pipe A outlet pipe 5122 located below the heat supply pipe B inlet pipe 5121 is connected back to the heat supply source 51. The devices, pipes, valves and the like of the device are all insulated by polyurethane material.

[0045] Specifically, the feeding inlet at the top of the fermentation tank is connected with a distributing device, the material is fed through the three feeding pipes at the top of the fermentation tank at the same time, the material accumulation is avoided, and the mass transfer performance of the material is improved.

[0046] As Figure 2As shown, the top of the anaerobic fermentation reactor 1 is provided with a feed inlet 23, a gas phase gas outlet 31 and a biogas sampling interface 33, in the anaerobic fermentation reactor 1, there are a highest liquid level scale line 71 and a lowest liquid level scale line 72, and a liquid level detection port 16 is also provided, so that the liquid level is always not higher than the highest liquid level scale line 71 and not lower than the lowest liquid level scale line 72 during production. On the same straight line of the anaerobic fermentation reactor 1, temperature detection ports 18 with different heights are arranged; on the same straight line of the anaerobic fermentation reactor 1, pH detection ports 17 with different heights are also arranged.

[0047] Specifically, the temperature detection ports 18 are respectively located at three parts of the hydrolysis zone 111, the acidification zone 112 and the methanogenesis zone 113 of the anaerobic fermentation reactor 1.

[0048] Specifically, the pH detection ports 17 are respectively located at three parts of the hydrolysis zone 111, the acidification zone 112 and the methanogenesis zone 113 of the anaerobic fermentation reactor 1.

[0049] As shown in the figure, Figure 3 The feed inlet 23 has three.

[0050] Specifically, according to the computer logic control program, a PID automatic control system is arranged to accurately control the mixing ratio of raw materials in the device, the operation value range and early warning value parameters of feeding, reflux, internal circulation and discharging, and is connected with online instruments such as a liquid level meter, a thermometer, a pressure gauge, a pH meter and a biogas analyzer.

[0051] Taking perishable garbage materials as an example, the working principle of the high-concentration vertical anaerobic fermentation device provided by the utility model is as follows:

[0052] The kitchen garbage, organic garbage and other perishable raw materials are pretreated by separation, crushing, desanding and the like to form an organic slurry with a water content of 25% to 30%. The organic slurry is fed into the storage bin through a belt or a screw. The material stored in the storage bin 22 is mixed with the material returned through the return pipe 12 at a ratio of 1:4 to 1:2 in the mixing container 21, and then is pumped through the circulating pipe C by the pump 81 through the feed pipe 24 into the anaerobic fermentation reactor 1 through the feeding device, and then is fed into the anaerobic fermentation reactor 1 from top to bottom through the hydrolysis zone 111 (hydrolysis), the acidification zone 112 (acid production) and the methane production zone 113 (methane production). The material is fed into the acidification zone through the circulating pipe A 101 and the circulating pipe B 102 by the internal circulation pump A 821 at the middle and lower parts of the anaerobic fermentation reactor 1. The material is continuously fermented by being fed into the anaerobic fermentation reactor 1 from the top feeding port through the circulating pipe A 101, the circulating pump B 822 and the internal circulation pipe 15 with the feed pipe 24 at the middle part of the anaerobic fermentation reactor 1. The material is discharged from the bottom solid-liquid phase discharge port 42 of the anaerobic fermentation reactor 1, and then is fed into the solid-liquid separation system through the discharge screw port 43 and the discharge pump 83. One part of the material is fed into the mixing container 21 through the return pipe 12 to be mixed with the new material, and then is re-fed into the anaerobic fermentation reactor. The other part of the material is fed into the solid-liquid separation system through the discharge pipe 13 for subsequent treatment. The gas produced by fermentation is discharged from the top gas phase outlet 31 of the anaerobic fermentation reactor 1, and then is fed into the biogas purification and utilization system 9. The heat supply source 51 supplies heat to the methane production zone 113 and the bottom of the anaerobic fermentation reactor 1 through the heat supply pipe A and the heat supply pipe B. The pH detection port 17 and the temperature detection port 18 are installed at the upper, middle and lower parts of the anaerobic fermentation reactor 1. Since the device does not have mechanical stirring, the temperature and pH value of each part are different, which is beneficial to better control the reaction. At the same time, the device is also provided with a liquid level detection port 16 to detect the liquid level in real time, so as to ensure that the liquid level in the reactor is between the highest liquid level scale line 71 and the lowest liquid level scale line 72, and to ensure the accuracy of the reaction. According to the computer logic control program, the PID automatic control system is set to accurately control the mixing ratio of each raw material in the device, the operating value range and the early warning value parameters of the feed, return, internal / external circulation, discharge and the like, and is connected with the online instruments such as the liquid level meter, the thermometer, the pressure gauge, the pH meter and the biogas analyzer in the device. The device greatly shortens the inoculation time of the material, strengthens the full contact between the bacteria and the material, accelerates the anaerobic fermentation and methane production stage, makes the material rapidly realize methane conversion, improves the conversion efficiency of the reactor, and shortens the residence time of the material.

[0053] Example 2

[0054] The inside of the anaerobic fermentation reactor 1 is divided into three areas from top to bottom, namely, a hydrolysis area 111, an acidification area 112 and a methanogenic area 113. The anaerobic fermentation reactor 1 has a gas phase outlet 31 at the top end thereof, which is connected to a gas outlet pipe. A pressure sensing device is installed on the side of the gas outlet pipe close to the gas phase outlet 31. The other side of the gas outlet pipe is connected to a biogas purification and utilization system 9. The acidification area is provided with a circulation pipe A101 which extends into the anaerobic fermentation reactor 1 and is connected to an internal circulation outlet A14 provided on the anaerobic fermentation reactor 1. The methanogenic area is provided with a circulation pipe B102 which extends into the anaerobic fermentation reactor 1 and is connected to an internal circulation outlet B19 provided on the anaerobic fermentation reactor 1. The circulation pipes A101 and B102 are connected to an internal circulation pipe 15. An internal circulation pump A821 is installed on the internal circulation pipe 15. The internal circulation pipe 15 is connected to a feeding pipe 24, so that the feeding material is re-fed into the device for fermentation. In the feeding unit, there is a mixing container 21 with a slope at the bottom. Above the mixing container 21, there is a storage bin 22. The mixing container 21 is connected to the feeding pipe 24. A circulation pipe C pump 81 is installed on the feeding pipe 24. The feeding pipe 24 is directly connected to a feeding inlet 23 at the top end of the anaerobic fermentation tank 1. The bottom end of the anaerobic fermentation reactor 1 is provided with a solid-liquid phase outlet 42 which is directly connected to a discharge screw outlet 43. The discharge screw outlet 43 is directly connected to a backflow pipe 12 and a discharge pipe 13 through a discharge pump 83. The end of the discharge pipe 13 away from the discharge pump 83 is directly connected to a solid-liquid separation system 6. The end of the backflow pipe 12 away from the discharge pump 83 is connected to the middle part of the mixing container 21. The backflow pump sends the mixed solid-liquid phase product of fermentation to the mixing container 21 through the backflow pipe 12, so that the product is re-fed into the fermentation system. A heat supply source 51 is provided beside the anaerobic fermentation reactor 1. The heat supply source 51 is connected to a heat supply pipe A inlet 5111 located in the methanogenic area 113 of the anaerobic fermentation reactor 1. The heat supply pipe A outlet 5112 located below the heat supply pipe A inlet 5111 is connected back to the heat supply source 51. The heat supply source 51 is connected to a heat supply pipe B inlet 5121 located at the bottom of the anaerobic fermentation reactor 1. The heat supply pipe A outlet 5122 located below the heat supply pipe B inlet 5121 is connected back to the heat supply source 51. The devices, pipes, valves and the like of the device are insulated with polyurethane material.

[0055] The top of the anaerobic fermentation reactor 1 is provided with a feeding inlet 23, a gas phase outlet 31 and a biogas sampling interface 33. The anaerobic fermentation reactor 1 has a highest liquid level scale line 71 and a lowest liquid level scale line 72. A liquid level detection port 16 is also provided to ensure that the liquid level is always not higher than the highest liquid level scale line 71 and not lower than the lowest liquid level scale line 72 during production. Different temperature detection ports 18 at different heights are provided on the same straight line of the anaerobic fermentation reactor 1. Different pH detection ports 17 at different heights are also provided on the same straight line of the anaerobic fermentation reactor 1.

[0056] Specifically, the temperature detection ports 18 are located at three parts of the hydrolysis zone 111, the acidification zone 112 and the methanogenic zone 113 of the anaerobic fermentation reactor 1 respectively.

[0057] Specifically, the pH detection ports 17 are located at three parts of the hydrolysis zone 111, the acidification zone 112 and the methanogenic zone 113 of the anaerobic fermentation reactor 1 respectively.

[0058] The feeding ports 23 are three.

[0059] Specifically, according to the computer logic control program, a PID automatic control system is set to precisely control the mixing ratio of raw materials in the device, the operation value range and the early warning value parameters of feeding, reflux, internal / external circulation, discharging and the like, and is connected to the on-line instruments such as the liquid level meter, the thermometer, the pressure gauge, the pH meter and the biogas analyzer in the device.

[0060] The working principle of the high-concentration vertical anaerobic fermentation device is as follows: livestock and poultry manure is pretreated by a grid and sand removal, and then forms organic material with a water content of 25% to 30%; the organic material enters a storage bin through a belt or a screw; the stored material in the storage bin enters a mixing container 21 and is mixed with the material returned through a return pipe 12 at a ratio of 1:4 to 1:2; the mixed material enters an anaerobic fermentation reactor 1 through a circulating pipe C pump 81, a feeding pipe 24, a feeding port on the anaerobic fermentation reactor 1, a distribution device, and the anaerobic fermentation reactor 1; the material in the anaerobic fermentation reactor 1 passes through a hydrolysis zone 111 (hydrolysis), an acidification zone 112 (acid production), and a methane production zone 113 (methane production) from top to bottom; the material in the middle and lower parts of the anaerobic fermentation reactor 1 enters the acidification zone through a circulating pipe A 101 and a circulating pipe B 102 and an internal circulating pump A 821; the material in the middle part of the anaerobic fermentation reactor 1 enters the anaerobic fermentation reactor 1 through a circulating pipe A 101, a circulating pump B 822, an internal circulating pipe 15, and the feeding pipe 24 from the top feeding port for further fermentation; the material is discharged from the bottom solid-liquid phase discharge port 42 of the anaerobic fermentation reactor 1, enters a discharge pump 83 through a discharge screw port 43, and then is mixed with new material in the mixing container 21 through the return pipe 12 and reenters the anaerobic fermentation reactor; the other part of the material enters a solid-liquid separation system through a discharge pipe 13 for subsequent treatment; the gas produced in the fermentation is discharged from the top gas phase outlet 31 of the anaerobic fermentation reactor 1, enters a biogas purification and utilization system 9 through a gas discharge pipe, and is supplied with heat by a heat supply source 51 through a heat supply pipe A and a heat supply pipe B to the methane production zone 113 and the bottom of the anaerobic fermentation reactor 1; pH detection ports 17 and temperature detection ports 18 are installed in the upper, middle, and lower parts of the anaerobic fermentation reactor 1; since the device does not have mechanical stirring, the temperature and pH values of the parts are different, which is beneficial to better control of the reaction; meanwhile, the device is also provided with a liquid level detection port 16 to detect the liquid level in real time, so that the liquid level in the reactor is located between the highest liquid level scale line 71 and the lowest liquid level scale line 72, the accuracy of the reaction is ensured, a PID automatic control system is set according to a computer logic control program, the mixing ratio of the materials in the device is accurately controlled, the running value range and the early warning value parameters of feeding, return, internal / external circulation, discharge, and the like are controlled, and the device is connected to online instruments such as a liquid level meter, a thermometer, a pressure gauge, a pH meter, and a biogas analyzer; the device greatly shortens the inoculation time of the material, strengthens the full contact between the bacteria and the material, accelerates the anaerobic fermentation and methane production stage, makes the material rapidly realize methane conversion, improves the conversion efficiency of the reactor, and shortens the residence time of the material.

[0061] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any way. Any simple modification, change, and equivalent structural transformation of the above embodiment according to the technical essence of the utility model still belong to the protection scope of the technical solution of the utility model.

Claims

1. A high concentration vertical anaerobic fermentation device, characterized by, The application relates to an anaerobic fermentation reactor, which comprises the following parts: an anaerobic fermentation reactor; a feeding unit connected with the feeding port of the anaerobic fermentation reactor; a gas-phase outlet unit connected with the gas-phase outlet of the anaerobic fermentation reactor; a solid-liquid phase outlet unit connected with the solid-liquid phase outlet of the anaerobic fermentation reactor; an internal circulation unit connected with the solid-liquid phase circulation port of the anaerobic fermentation reactor; a temperature-maintaining unit, which comprises a heat supply source, a heat supply pipe A connecting the heat supply source and the bottom of the anaerobic fermentation reactor, and a heat supply pipe B connecting the mixing container and the heat supply source.

2. The high concentration vertical anaerobic fermentation device according to claim 1, characterized in that, The anaerobic fermentation reactor is sequentially divided into a hydrolysis zone, an acidification zone and a methanogenic zone from top to bottom, and the heat supply pipe A supplies heat to the methanogenic zone at the lower part of the anaerobic fermentation reactor.

3. The high concentration vertical anaerobic fermentation device according to claim 1 or 2, characterized in that, The acidification zone is provided with a circulation pipe A penetrating into the interior of the anaerobic fermentation reactor, and the methanogenic zone is provided with a circulation pipe B penetrating into the interior of the anaerobic fermentation reactor.

4. The high concentration vertical anaerobic fermentation device according to claim 1, characterized in that, The feeding unit comprises a mixing container and a storage bin for feeding the mixing container; the mixing container is connected with the anaerobic fermentation reactor through a feeding pipe.

5. The high concentration vertical anaerobic fermentation device according to claim 4, characterized in that, The feeding pipe is connected with an internal circulation pipe, and the upstream of the internal circulation pipe is connected with the circulation pipe A and the circulation pipe B respectively.

6. The high concentration vertical anaerobic fermentation device according to claim 1, characterized in that, The solid-liquid phase outlet unit comprises a spiral outlet connected with the solid-liquid phase outlet at the lower part of the anaerobic fermentation reactor and a solid-liquid separation system connected with the spiral outlet through a discharge pipe.

7. The high concentration vertical anaerobic fermentation device according to claim 6, characterized in that, The discharge pipe is connected with a backflow pipe, and the end of the backflow pipe far from the discharge pipe is connected with the top of the mixing container.

8. The high concentration vertical anaerobic fermentation device according to claim 1 or 2, characterized in that, The mixing container is provided with a circulation pipe C connecting the bottom and the top of the mixing container.

9. The high concentration vertical anaerobic fermentation device according to claim 1, characterized in that, The gas-phase outlet unit comprises an outlet pipe connected with the gas-phase outlet at the top of the anaerobic fermentation reactor and a pressure sensing device installed on the outlet pipe.

10. The high concentration vertical anaerobic fermentation device according to claim 1 or 9, characterized in that, The anaerobic fermentation reactor is provided with a pH detection port and a temperature detection port; and the mixing container is provided with a temperature detection port.

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