CN112300901A - Vertical dry anaerobic system with lower feeding and upper discharging functions - Google Patents
Vertical dry anaerobic system with lower feeding and upper discharging functions Download PDFInfo
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Abstract
A vertical dry anaerobic system with lower feeding and upper discharging comprises a feeding back mixing tank, an anaerobic fermentation tank, a discharging tank and a sand discharging device; the upper part of the side wall of the feeding back-mixing tank is connected with a raw material feeding pipe, the bottom of the side wall is connected with a steam pipe, and the bottom end of the feeding back-mixing tank is connected with a feeding plunger pump; the anaerobic fermentation tank is characterized in that a heat preservation coil pipe is arranged outside a shell of the anaerobic fermentation tank, an anaerobic tank feeding pipe is arranged at the bottom of the shell, one end of the anaerobic tank feeding pipe is connected with a feeding plunger pump, the center of the bottom end of the shell is connected with a sand outlet pipe, and a plurality of spiral discharging machines are uniformly arranged on the upper part of the side wall of the shell and are respectively connected with a return pipe and an anaerobic tank discharging pipe; the top of the discharge tank shell is connected with a discharge pipe of the anaerobic tank, the bottom of the discharge tank shell is connected with the discharge pipe, and the bottom of the discharge pipe is provided with a discharge plunger pump; the sand outlet device is connected with the bottom of the sand outlet pipe. The system can adapt to the feeding solid content of 20-25%, discharge layered floating slag materials, and expand the range of the water content of the feeding materials in the vertical dry anaerobic fermentation technology.
Description
Technical Field
The invention relates to the field of solid waste treatment, in particular to a vertical dry anaerobic system with lower feeding and upper discharging.
Background
At present, garbage classification becomes new and fashionable, and the independent treatment of high-solid easily-degradable organic garbage is trendy. At present, the dry anaerobic digestion technology adopted in China mainly comprises a vertical technology and a horizontal technology. Compared with the vertical anaerobic fermentation technology, the horizontal anaerobic fermentation technology occupies a large area and has high investment. The mature technology of the vertical dry anaerobic digestion mainly comprises a Dranco process and a Valorga process. However, the existing vertical dry anaerobic digestion technology is from foreign countries, has high content of light and heavy impurities of kitchen garbage in China, has poor material characteristic adaptability with solid content lower than that of the traditional dry anaerobic digestion technology, and the scum and sand setting tank are accumulated to hinder the stable operation of fermentation.
Horizontal anaerobic fermentation technology: the technology representatives comprise a German Strabag technology, a German TTV technology and a Switzerland Kompogas technology, the height of materials of the three types of horizontal anaerobic fermentation technologies is only half of that of vertical anaerobic fermentation materials, and the occupied area is large. Meanwhile, the stirring equipment is arranged in the device, so that the investment is large. There is a dead angle between the agitators, and the sediment accumulates and loses the tank capacity.
Belgium Dranco vertical anaerobic fermentation technology: the solid content of the materials is required to be more than 25%, plug flow from top to bottom is formed in the tank, the solid content of kitchen garbage in China is only 20-25%, the solid content after anaerobic degradation is 15-20%, scum can be formed, no discharge way exists in accumulation in the tank, biogas production by fermentation is hindered, and potential safety hazards exist due to overlarge pressure in the tank.
French Valorga vertical anaerobic fermentation technology: the biogas is pressurized and reflowed to be injected into the tank, and the material is pushed to move towards the discharge hole at the other side. Because the kitchen garbage in China has low solid content and high light and heavy impurity content, scum and settled sand can be formed, and no discharge way exists when the scum and settled sand are accumulated in a tank. The scum layer prevents the fermentation to produce the methane, so that the pressure in the tank is overlarge, and potential safety hazards exist. The sand setting layer blocks the air holes, which hinders the plug flow stable operation in the tank.
In summary, although the prior art can effectively treat high-solid easily-degradable organic garbage with high solid content and low impurity content, the solid content of the kitchen garbage in China is lower than 25%, the impurity content is high, and the problems of scum and sand deposition generated in a tank need to be improved, so that a new anaerobic system suitable for the characteristics of the kitchen garbage in China is needed to meet the requirements of classified kitchen garbage treatment projects.
Disclosure of Invention
The invention aims to provide a vertical dry anaerobic system with lower feeding and upper discharging, which utilizes a feeding plunger pump and an anaerobic tank discharging pipe to send materials to the bottom of an anaerobic fermentation tank, the anaerobic fermentation tank adopts a mode of crushing the top by an upper spiral discharging machine to push and discharge, and a sand outlet device is arranged at the bottom of the anaerobic fermentation tank to adapt to the phenomenon of fermentation layering.
As conceived above, the technical scheme of the invention is as follows: the vertical dry anaerobic system with the lower feeding and the upper discharging is characterized in that: comprises a feeding back mixing tank, an anaerobic fermentation tank, a discharging tank and a sand discharging device; the upper part of the side wall of the feeding back-mixing tank is connected with a raw material feeding pipe, the bottom of the side wall is connected with a steam pipe for heating materials in the tank, and the bottom end of the feeding back-mixing tank is connected with a feeding plunger pump through a pipeline; the anaerobic fermentation tank is characterized in that a heat preservation coil pipe is arranged outside a shell of the anaerobic fermentation tank, an anaerobic tank feeding pipe is arranged at the bottom of the shell, one end of the anaerobic tank feeding pipe is connected with a feeding plunger pump, so that a feeding back mixing tank is communicated with the anaerobic fermentation tank, sand is discharged from the center of the bottom end of the shell and is connected with a sand discharging pipe, a plurality of spiral discharging machines are uniformly arranged on the upper part of the side wall of the shell and are respectively connected with a returning pipe and an anaerobic tank discharging pipe, the returning pipe is communicated with the feeding back mixing tank, and; the top of the discharge tank shell is connected with a discharge pipe of the anaerobic tank, the bottom of the discharge tank shell is connected with the discharge pipe, and the bottom of the discharge pipe is provided with a discharge plunger pump; the sand outlet device is connected with the bottom of the sand outlet pipe.
Further, the shell of the feeding back mixing tank is a cylindrical silo, and a heat-insulating layer with the thickness of 100mm is coated outside the cylindrical silo.
Further, a temperature sensor is arranged in the middle of the side wall of the feeding back mixing tank.
Further, the top of the feeding back-mixing tank is provided with an odor pipe and a radar level gauge.
Furthermore, double-knife gate valves are arranged on pipelines, sand outlet pipes and discharge pipes which are connected with the feeding plunger pump at the bottom ends of the return pipe, the feeding pipe of the anaerobic tank and the feeding back-mixing tank.
Furthermore, the anaerobic fermentation tank is a cylindrical silo, the bottom of the silo is conical, and a heat-insulating layer with the thickness of 200mm is coated outside the silo.
Furthermore, a temperature sensor is arranged in the middle of the side wall of the anaerobic fermentation tank.
Further, a positive-negative pressure protector, a biogas pipe and a radar level gauge are arranged at the top of the anaerobic fermentation tank.
Further, an odor pipe and a radar level gauge are arranged at the top of the discharging tank.
Further, the sand discharging device adopts a screw conveyer.
According to the anaerobic fermentation tank, materials are conveyed to the bottom of the anaerobic fermentation tank through the feeding plunger pump and the anaerobic tank discharging pipe, the anaerobic fermentation tank pushes the materials to be discharged through the upper spiral discharging machine, the materials enter the feeding back mixing tank through the material returning pipe by utilizing the material level difference, the materials enter the discharging tank through the anaerobic discharging pipe, settled sand in the anaerobic fermentation tank is lifted and discharged through the bottom sand discharging device (spiral conveyor) to prevent deposition, and the discharging tank sends digestion residues to a subsequent treatment working section through the discharging plunger pump and the discharging pipe. According to the invention, the raw materials and the anaerobic fermentation discharge materials are mixed in the feeding back mixing tank, the mixing ratio is 1:4-1:6, and the stirring in the fermentation tank is replaced by the large-ratio backflow, so that the inoculation and the uniform mixing of the materials are realized. Compared with the vertical dry anaerobic digestion process with Dranco from top to bottom, the invention can adapt to the feed solid content of 20-25%, discharge layered floating slag material, and expand the feed water content range of the vertical dry anaerobic fermentation technology.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-raw materials inlet pipe, 2-feeding back-mixing tank, 3-heat preservation layer, 4-steam pipe, 5-temperature sensor, 6-radar level gauge, 7-ozone pipe, 8-double knife gate valve, 9-feeding plunger pump, 10-anaerobic tank inlet pipe, 11-anaerobic fermentation tank, 12-heat preservation coil pipe, 13-sand outlet pipe, 14-biogas pipe, 15-positive and negative pressure protector, 16-spiral discharging machine, 17-weighing support, 18-material return pipe, 19-anaerobic tank discharging pipe, 20-discharging tank, 21-discharging pipe, 22-spiral conveyer.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and specific examples.
As shown in the figure, the invention provides a vertical dry anaerobic system with lower feeding and upper discharging, which consists of a feeding back mixing tank 2, an anaerobic fermentation tank 11, a discharging tank 20 and a sand discharging device 22.
The raw material feeding pipe 1 is connected on the upper portion of the side wall of the feeding back-mixing tank 2, the bottom of the side wall is connected with a steam pipe 4 used for heating materials in the tank, and the middle of the side wall is provided with a temperature sensor 5. The bottom of the feeding back-mixing tank 2 is connected with a feeding plunger pump 9 through a pipeline, a double-knife gate valve 8 is arranged on the pipeline, and an odor pipe 7 and a radar level gauge 6 with the pipe diameter not less than DN50 are arranged at the top of the feeding back-mixing tank 2. The shell of the feeding back mixing tank is a cylindrical silo, a polystyrene foam plate heat-insulating layer is coated outside the shell of the silo, the thickness of the heat-insulating layer is 100mm, the pipe diameter of the steam pipe is not less than DN50, the pipe diameter of the raw material feeding pipe is not less than DN250,
the anaerobic fermentation tank 11 shell is a cylindrical silo, and the bottom of the silo shell is conical so as to facilitate sand discharge and uniform feeding. DN25 heat preservation coil pipe 12 is arranged outside the silo shell, a polystyrene foam board heat preservation layer is coated outside the silo shell, the thickness of the heat preservation layer is 200mm, and hot water in the heat preservation coil pipe 12 is supplied by a boiler room. Anaerobic fermentation tank 11 bottom sets up anaerobic jar inlet pipe 10 that the pipe diameter is not less than DN300, makes anaerobic fermentation tank bottom central authorities feed, and the one end and the feeding plunger pump 9 of this anaerobic jar inlet pipe 10 are connected to make the feeding back irritate 2 and anaerobic fermentation tank 11 intercommunication thoughtlessly. The bottom center of the anaerobic fermentation tank is connected with a sand outlet pipe 13 with the diameter not less than DN800, and the sand outlet pipe is provided with a double-knife gate valve 8 (pneumatic, manual) for controlling the opening and closing. And a temperature sensor 5 is arranged in the middle of the side wall of the anaerobic fermentation tank. The top of the anaerobic fermentation tank 11 is provided with a biogas pipe 14 with the pipe diameter not less than DN150, a positive and negative pressure protector 15 and a radar level indicator 6. Every 90 degrees of the upper part of the side wall of the silo shell are provided with 4 spiral discharging machines, the spiral discharging machines are divided into two groups which are respectively connected with a return pipe 18 and an anaerobic tank discharging pipe 19, the pipe diameters of the return pipe 18 and the anaerobic tank discharging pipe are not less than DN250, the return pipe 18 is communicated with the feeding back mixing tank 2, and the anaerobic tank discharging pipe 19 is communicated with the discharging tank 20. The spiral discharging machine pushes discharging and prevents scum from crusting, the material enters the feeding back mixing tank through the return pipe by virtue of material level difference and enters the discharging tank through the anaerobic discharging pipe, settled sand in the anaerobic fermentation tank is discharged by replacing the bottom sand discharging device (spiral conveyor), and deposition is prevented. And the return pipe 18 and the anaerobic tank discharge pipe 19 are both provided with a double-knife gate valve 8.
The discharging tank 20 is a cylindrical silo shell, a discharging pipe 21 with the pipe diameter not less than DN250 is arranged at the bottom of the shell, and an anaerobic tank discharging pipe 19 with the pipe diameter not less than DN250, an odor pipe 7 with the pipe diameter not less than DN50 and a radar level indicator 6 are arranged at the top of the shell. And a double-knife gate valve 8 is arranged on the discharge pipe 21.
The sand outlet device is a phi 500 screw conveyer 22 which is arranged at the bottom of the anaerobic fermentation tank 11 and is connected with a sand outlet pipe 13 at the bottom end of the anaerobic fermentation tank.
The specific implementation process of the invention is as follows:
1. mixing the raw materials and the anaerobic fermentation discharge material in a feeding back mixing tank, and replacing the fermentation tank with stirring by refluxing in a large proportion according to the mixing proportion of 1:4-1:6 to realize inoculation and uniform mixing of the materials. And the batch was heated to 55 ℃ by injecting saturated steam at 140 ℃. The material discharging is controlled by a double-knife valve at the bottom, and the material is pumped to an anaerobic fermentation tank by a plunger pump.
2. When the anaerobic fermentation tank does not feed, the double-knife gate valve on the feeding pipe of the anaerobic tank is closed. When the anaerobic fermentation tank feeds, the double-knife gate valve on the discharging pipe of the feeding back-mixing tank is opened firstly, the feeding plunger pump is started, and then the double-knife gate valve on the feeding pipe of the anaerobic tank is opened. And after the feeding is finished, closing the double-knife gate valve on the feeding pipe of the anaerobic tank, stopping the feeding plunger pump, and closing the double-knife gate valve on the discharging pipe of the feeding back-mixing tank.
3. The anaerobic fermentation tank is insulated by hot water with the water inlet temperature of 80 ℃, and high-temperature (55 +/-2 ℃) fermentation is carried out in the fermentation tank. And (3) discharging primary settled sand from the bottom of the anaerobic fermentation tank from one month to one quarter by using the anaerobic fermentation tank, opening a double-knife gate valve on a sand outlet pipe when the settled sand is removed, and lifting the sand to an outward transport vehicle by using a screw conveyor. Anaerobic fermentation jar passes through the spiral discharging machine propelling movement ejection of compact of upper portion side dress, and four spiral discharging machines divide into two sets ofly, and the jar and the play jar are mixed to the feeding back of discharging through return pipe and anaerobic jar discharging pipe with the material respectively. And (3) opening the double-knife gate valve on the discharge pipe during discharging, and closing the double-knife gate valve when discharging is not performed.
4. The material of the discharge tank is sent to a rear-end processing section for further processing through a discharge plunger pump and a pipeline. And (3) opening the double-knife gate valve on the discharge pipe during discharging, and closing the double-knife gate valve when discharging is not performed.
The above embodiments are merely typical embodiments of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the concept or principle of the present invention, which falls into the protection scope of the present invention.
Claims (10)
1. The vertical dry anaerobic system with the lower feeding and the upper discharging is characterized in that: comprises a feeding back mixing tank, an anaerobic fermentation tank, a discharging tank and a sand discharging device; the upper part of the side wall of the feeding back-mixing tank is connected with a raw material feeding pipe, the bottom of the side wall is connected with a steam pipe for heating materials in the tank, and the bottom end of the feeding back-mixing tank is connected with a feeding plunger pump through a pipeline; the anaerobic fermentation tank is characterized in that a heat preservation coil pipe is arranged outside a shell of the anaerobic fermentation tank, an anaerobic tank feeding pipe is arranged at the bottom of the shell, one end of the anaerobic tank feeding pipe is connected with a feeding plunger pump, so that a feeding back mixing tank is communicated with the anaerobic fermentation tank, sand is discharged from the center of the bottom end of the shell and is connected with a sand discharging pipe, a plurality of spiral discharging machines are uniformly arranged on the upper part of the side wall of the shell and are respectively connected with a returning pipe and an anaerobic tank discharging pipe, the returning pipe is communicated with the feeding back mixing tank, and; the top of the discharge tank shell is connected with a discharge pipe of the anaerobic tank, the bottom of the discharge tank shell is connected with the discharge pipe, and the bottom of the discharge pipe is provided with a discharge plunger pump; the sand outlet device is connected with the bottom of the sand outlet pipe.
2. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: the shell of the feeding back mixing tank is a cylindrical silo, and a heat-insulating layer with the thickness of 100mm is coated outside the cylindrical silo.
3. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: and a temperature sensor is arranged in the middle of the side wall of the feeding back mixing tank.
4. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: and the top of the feeding back mixing tank is provided with an odor pipe and a radar level gauge.
5. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: and double-knife gate valves are respectively arranged on the pipeline, the sand outlet pipe and the discharge pipe, which are connected with the feeding plunger pump, at the bottom ends of the return pipe, the feeding pipe of the anaerobic tank and the feeding back mixing tank.
6. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: the anaerobic fermentation tank is a cylindrical silo, the bottom of the silo is conical, and a heat-insulating layer with the thickness of 200mm is coated outside the silo.
7. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: and a temperature sensor is arranged in the middle of the side wall of the anaerobic fermentation tank.
8. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: and a positive-negative pressure protector, a biogas pipe and a radar level gauge are arranged at the top of the anaerobic fermentation tank.
9. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: and the top of the discharging tank is provided with an odor pipe and a radar level gauge.
10. The vertical dry anaerobic system with lower feeding and upper discharging according to claim 1, characterized in that: the sand discharging device adopts a screw conveyer.
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| CN202011178715.8A CN112300901A (en) | 2020-10-29 | 2020-10-29 | Vertical dry anaerobic system with lower feeding and upper discharging functions |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114480103A (en) * | 2022-01-05 | 2022-05-13 | 上海市机电设计研究院有限公司 | Vertical dry-process anaerobic reactor system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114480103A (en) * | 2022-01-05 | 2022-05-13 | 上海市机电设计研究院有限公司 | Vertical dry-process anaerobic reactor system and control method thereof |
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