CN216273827U - Powder fertilizer manufacturing system based on dry anaerobic biogas residue three-stage dehydration - Google Patents
Powder fertilizer manufacturing system based on dry anaerobic biogas residue three-stage dehydration Download PDFInfo
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- CN216273827U CN216273827U CN202122998002.2U CN202122998002U CN216273827U CN 216273827 U CN216273827 U CN 216273827U CN 202122998002 U CN202122998002 U CN 202122998002U CN 216273827 U CN216273827 U CN 216273827U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
A powder fertilizer manufacturing system based on dry anaerobic biogas residue three-stage dehydration comprises a three-stage dehydration system, a dried compost system and a crushing and screening system. Tertiary dewatering system includes screw extrusion hydroextractor, one-level dehydration filtrate pond, vibrating screen classifier, second grade dehydration filtrate pond and centrifugal dehydrator, mummification compost system includes one-level sediment mummification compost storehouse, blendor and second grade sediment mummification compost storehouse, crushing screen classification system includes link joint batcher, No. two link joint batchers, a crushing screen extension and No. two crushing screen extensions. The system utilizes three-stage dehydration, drying composting and crushing and screening fertilizer preparation processes to produce the powdery organic fertilizer, thereby reducing the resource and energy consumption, and simultaneously, the characteristics of biogas residues generated by three-stage dehydration are different, so as to meet the requirement of recycling the household kitchen garbage dry digestion dehydrated biogas residues.
Description
Technical Field
The utility model belongs to the technical field of garbage treatment, and particularly relates to a powder fertilizer production system based on dry anaerobic biogas residue three-stage dehydration.
Background
The household kitchen garbage is mainly derived from perishable organic wastes generated in household life, and the biogas is produced by adopting dry anaerobic fermentation resource. However, a large amount of residues are still produced after anaerobic digestion, and because the water content is high, a three-stage dehydration mode is usually adopted in the current project to realize solid-liquid separation, the dehydrated solid phase is burnt or buried, and the dehydrated liquid phase enters a sewage treatment system to be treated and discharged after reaching the standard. The dehydrated solid phase is burnt or landfilled, so that the nutrient elements in the biogas residues cannot be fully utilized, the energy is consumed, and the land is occupied.
The incineration disposal of the dry digestion dehydrated biogas residues can realize reduction to the maximum extent, but can only be used as a domestic garbage mixed combustion material due to low heat value, and a large amount of inorganic residues and ash still need to be further buried and disposed after incineration; if the water content is not enough to meet the requirement of landfill, further drying treatment is needed, a steam boiler heating system needs to be additionally built, and a large amount of land resources are consumed.
The dehydrated biogas residues contain a large amount of nutrient elements, the raw materials are mainly food wastes, the content of toxic substances is low, and the applied soil is safe and reliable, but the C/N nutrition is unbalanced, the water content is high, the properties of the primary biogas residues and the secondary and tertiary biogas residues are different, and a targeted process is needed for further processing the primary biogas residues and the secondary and tertiary biogas residues, so that the biogas residues meet the requirements of related fertilizer standards.
In summary, the conventional technology can realize proper treatment of the kitchen waste dry digestion dehydrated biogas residues, but the resource and energy consumption is large, and meanwhile, the characteristics of biogas residues generated by three-stage dehydration are different, so that a powder fertilizer manufacturing process and a system based on dry anaerobic biogas residue three-stage dehydration are needed, and the requirement of recycling the household kitchen waste dry digestion dehydrated biogas residues is met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a powder fertilizer production system based on dry anaerobic biogas residue three-stage dehydration, which utilizes three-stage dehydration, dried composting and crushing and screening fertilizer preparation processes to produce powdery organic fertilizer, thereby reducing resource and energy consumption, and simultaneously, biogas residues generated by three-stage dehydration have different characteristics so as to meet the requirement of recycling the dehydrated biogas residues of household kitchen garbage by dry digestion.
As conceived above, the technical scheme of the utility model is as follows: the utility model provides a powder fertilizer preparation system based on tertiary dehydration of dry process anaerobism natural pond sediment, includes dewatering system, mummification compost system and crushing and screening system, its characterized in that: the dewatering system adopts a three-level dewatering system and comprises a screw extrusion dewatering machine, a first-level dewatering filtrate pool, a vibration screening machine, a second-level dewatering filtrate pool and a centrifugal dewatering machine, wherein the screw extrusion dewatering machine and the first-level dewatering filtrate pool are subjected to gravity blanking through a pipeline, the outlet of the first-level dewatering filtrate pool is connected with the vibration screening machine through a screw pump and a pipeline, the vibration screening machine and the second-level dewatering filtrate pool are subjected to gravity blanking through a pipeline, the outlet of the second-level dewatering filtrate pool is connected with the centrifugal dewatering machine through a screw pump and a pipeline, and the outlet of the screw extrusion dewatering machine, the outlet of the vibration screening machine and the outlet of the centrifugal dewatering machine respectively generate first-level biogas residues, second-level biogas residues and third-level biogas residues;
the drying composting system comprises a primary slag drying composting bin, a mixer and a secondary slag drying composting bin, wherein an inlet of the primary slag drying composting bin is communicated with the screw extrusion dehydrator through a belt conveyor to receive primary biogas residues;
the crushing and screening system comprises a chain plate feeder, a second chain plate feeder, a crushing and screening machine and a second crushing and screening machine, the chain plate feeder and the second chain plate feeder are connected with the hopper to be communicated with the outlet of the first-grade slag drying composting bin and the outlet of the second-grade slag drying composting bin respectively, discharge outlets of the chain plate feeder and the second chain plate feeder are communicated with the crushing and screening machine and the second crushing and screening machine respectively, and sundries and organic powder fertilizers on the screen are output by the crushing and screening machine and the second crushing and screening machine respectively.
Preferably, the secondary dewatering filtrate pool is connected with a flocculant storage bin through a peristaltic pump and a pipeline.
Preferably, the screw extrusion dehydrator adopts a 5mm stainless steel screen.
The utility model has the following advantages:
1. the utility model effectively dehydrates the digestion residue with the water content of 80-85% to ensure that the dehydrated sewage meets the water inlet requirement of a sewage treatment system;
2. according to the utility model, different drying composting schemes are adopted according to the characteristics of the primary, secondary and tertiary dehydrated biogas residues, the process adaptability is strong, impurities such as plastics and the like are effectively removed, and the water content and the decomposition degree of the product meet the standard requirements of organic fertilizers;
3. the utility model realizes resource utilization of all the biogas residues and high recovery utilization rate to the utmost extent.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
The specific implementation mode is as follows:
the utility model is described in detail below with reference to the accompanying drawings and specific examples.
As shown in figure 1, the utility model provides a powder fertilizer production system based on dry anaerobic biogas residue three-stage dehydration, which comprises a dehydration system, a drying composting system and a crushing and screening system.
The dewatering system adopts a three-level dewatering system and comprises a screw extrusion dewatering machine, a first-level dewatering filtrate pool, a vibration screening machine, a flocculating agent storage bin, a second-level dewatering filtrate pool and a centrifugal dewatering machine, wherein the screw extrusion dewatering machine and the first-level dewatering filtrate pool are subjected to gravity blanking through a pipeline, the outlet of the first-level dewatering filtrate pool is connected with the vibration screening machine through a first screw pump and a pipeline, the vibration screening machine and the second-level dewatering filtrate pool are subjected to gravity blanking through a pipeline, the outlet of the second-level dewatering filtrate pool is connected with the centrifugal dewatering machine through a second screw pump and a pipeline, and the outlets of the screw extrusion dewatering machine, the vibration screening machine and the centrifugal dewatering machine respectively generate first-level biogas residues, second-level biogas residues and third-level biogas residues; the second-stage dehydration filtrate pool is connected with a flocculating agent storage bin through a peristaltic pump and a pipeline.
The drying composting system comprises a primary slag drying composting bin, a mixer and a secondary slag drying composting bin, wherein an inlet of the primary slag drying composting bin is communicated with the screw extrusion dehydrator through a belt conveyor to receive primary biogas residues;
the crushing and screening system comprises a chain plate feeder, a second chain plate feeder, a crushing and screening machine and a second crushing and screening machine, the chain plate feeder and the second chain plate feeder are connected with the hopper to be communicated with the outlet of the first-grade slag drying composting bin and the outlet of the second-grade slag drying composting bin respectively, discharge outlets of the chain plate feeder and the second chain plate feeder are communicated with the crushing and screening machine and the second crushing and screening machine respectively, and sundries and organic powder fertilizers on the screen are output by the crushing and screening machine and the second crushing and screening machine respectively.
The screw extrusion dehydrator adopts a 5mm stainless steel screen, 5bar backpressure plugging squeezing is adopted in a squeezing area, large-size materials in digestion residues are removed, moisture of the large materials is removed, and first-stage biogas residues with the water content of about 65% are formed.
The primary dewatering filtrate tank is used for containing filtrate generated by screw extrusion primary dewatering and providing a material temporary storage condition for pumping to the next working section.
The filter liquor after the large materials are removed passes through a 1mm polyurethane screen by the vibrating screen classifier, so that heavy materials such as gravel and particles are further removed, appropriate conditions are provided for subsequent centrifugal dehydration, and secondary biogas residues with the water content of about 70% are formed.
And the flocculating agent storage bin mixes PAM and water to prepare flocculating agent stock solution of 2-3 per mill for temporary storage.
And the secondary dehydration filtrate tank is used for containing filtrate generated by secondary dehydration of vibration screening and is uniformly mixed with a flocculant storage solution, so that appropriate conditions are provided for subsequent centrifugal dehydration.
And centrifuging the secondary dewatering filtrate added with the flocculating agent by using 3500G to generate sewage with the water content of about 80 percent and the tertiary biogas residues and suspended particulate matters of not more than 5000mg/L, and discharging the sewage to a sewage treatment system to treat the sewage up to the standard and then discharging the sewage.
The first-stage biogas residue drying composting bin stacks the first-stage biogas residue for 20 days in an aerobic manner, and exposes 55 ℃ hot air to further stabilize and decompose organic matters, and meanwhile, the water content of the product is reduced by less than 30%.
And the mixer uniformly mixes the secondary and tertiary biogas residues with the crushed straw auxiliary materials.
The secondary biogas residue drying composting bin stacks the mixed material aerobically for 20 days, and exposes 55 ℃ hot air to further stabilize and decompose organic matters, and simultaneously reduces the water content of the product to be less than 30%.
And the chain plate feeder collects the compost products in the receiving hopper and lifts the compost products to a feeding hole of the crushing and screening machine.
And the compost products are cut and crushed by a double shaft of 30m/s through the crushing and screening machine, organic powder fertilizers with the size smaller than 4mm are screened out, oversize products of the first-level biogas residue compost are transported to be burned or buried, and oversize products of the second-level and third-level biogas residue composts are returned to the crushing and screening machine for secondary treatment.
The powder fertilizer preparation method of the powder fertilizer preparation system based on dry anaerobic biogas residue three-stage dehydration comprises the following working sections:
1. a third-stage dehydration section: the residue of kitchen garbage after dry anaerobic fermentation is firstly sent to a screw extrusion dehydrator for primary dehydration, primary biogas residue with the grain diameter larger than 5mm is squeezed out, the residue is sent to a primary residue drying compost bin by a belt conveyor, the generated filtrate is discharged into a primary dehydration filtrate pool by the gravity of a pipeline, the filtrate in the primary dehydration filtrate pool is pumped to a vibration screening machine for secondary dehydration by a screw pump, secondary biogas residue with the grain diameter larger than 1mm is screened out and is sent to a mixer by the screw conveyor, the generated filtrate is discharged into a gravity secondary dehydration filtrate pool by the pipeline, the flocculant stock solution stored in a flocculant storage bin is pumped to a secondary dehydration filtrate pool by a peristaltic pump, uniformly mixing the filtrate with the second-stage dehydration filtrate, sending the mixture to a centrifugal dehydrator through a second screw pump for third-stage dehydration, sending the separated third-stage biogas residues to a mixer through a screw conveyer, and sending the generated filtrate to a sewage treatment system for treatment and then discharging the filtrate after reaching the standard;
2. a drying composting section: the first-level biogas residues are directly conveyed to a first-level residue drying composting bin by a belt conveyor, the second-level and third-level biogas residues are conveyed to a mixer by a screw conveyor to be uniformly mixed with auxiliary materials such as crushed straws and the like, and then are conveyed to a second-level residue drying composting bin by the belt conveyor, the drying composting bin is aerated with hot air at 55 ℃ by an air blower, compost is carried out for 20 days, and the compost is turned over once in 2 days, so that the material drying is realized in the compost decomposing process, the moisture content is less than 30%, and the seed germination rate is more than 70%.
3. A crushing and screening section: conveying the compost products after drying the compost to a chain plate feeder receiving hopper through a forklift, conveying the materials into a crushing and screening machine by the chain plate feeder, conveying sundries which are larger than 4mm and screened by a first crushing and screening machine to the outside for burning or landfill, and returning sundries which are larger than 4mm and screened by a second crushing and screening machine to the crushing and screening machine for secondary screening and tertiary screening of the compost products of the biogas residues.
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 (3)
1. The utility model provides a powder fertilizer preparation system based on tertiary dehydration of dry process anaerobism natural pond sediment, includes dewatering system, mummification compost system and crushing and screening system, its characterized in that: the dewatering system adopts a three-level dewatering system and comprises a screw extrusion dewatering machine, a first-level dewatering filtrate pool, a vibration screening machine, a second-level dewatering filtrate pool and a centrifugal dewatering machine, wherein the screw extrusion dewatering machine and the first-level dewatering filtrate pool are subjected to gravity blanking through a pipeline, the outlet of the first-level dewatering filtrate pool is connected with the vibration screening machine through a screw pump and a pipeline, the vibration screening machine and the second-level dewatering filtrate pool are subjected to gravity blanking through a pipeline, the outlet of the second-level dewatering filtrate pool is connected with the centrifugal dewatering machine through a screw pump and a pipeline, and the outlet of the screw extrusion dewatering machine, the outlet of the vibration screening machine and the outlet of the centrifugal dewatering machine respectively generate first-level biogas residues, second-level biogas residues and third-level biogas residues;
the drying composting system comprises a primary slag drying composting bin, a mixer and a secondary slag drying composting bin, wherein an inlet of the primary slag drying composting bin is communicated with the screw extrusion dehydrator through a belt conveyor to receive primary biogas residues;
the crushing and screening system comprises a chain plate feeder, a second chain plate feeder, a crushing and screening machine and a second crushing and screening machine, the chain plate feeder and the second chain plate feeder are connected with the hopper to be communicated with the outlet of the first-grade slag drying composting bin and the outlet of the second-grade slag drying composting bin respectively, discharge outlets of the chain plate feeder and the second chain plate feeder are communicated with the crushing and screening machine and the second crushing and screening machine respectively, and sundries and organic powder fertilizers on the screen are output by the crushing and screening machine and the second crushing and screening machine respectively.
2. The powder fertilizer production system based on dry anaerobic biogas residue three-stage dehydration is characterized in that: the second-stage dehydration filtrate pool is connected with a flocculating agent storage bin through a peristaltic pump and a pipeline.
3. The powder fertilizer production system based on dry anaerobic biogas residue three-stage dehydration is characterized in that: the screw extrusion dehydrator adopts a 5mm stainless steel screen.
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| CN114057514A (en) * | 2021-12-01 | 2022-02-18 | 中国市政工程华北设计研究总院有限公司 | Dry anaerobic biogas residue three-stage dehydration-based powder fertilizer production system and powder fertilizer production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114057514A (en) * | 2021-12-01 | 2022-02-18 | 中国市政工程华北设计研究总院有限公司 | Dry anaerobic biogas residue three-stage dehydration-based powder fertilizer production system and powder fertilizer production method thereof |
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