Livestock and poultry waste small-scale resource processing complete equipment and processing method thereof

Abstract

The application discloses a complete equipment for small-sized resourceful treatment of livestock and poultry wastes and a treatment method thereof, and relates to the technical field of waste treatment. The equipment comprises a double-path pretreatment module for treating pig hair, chicken hair, pig bones, chicken bones and other livestock and poultry wastes, a quantitative confluence module, a continuous high-temperature and high-pressure hydrolysis module, a screw pressing module, a three-stage phase shunt module, a drying, crushing and screening module, a finished product packaging module and a high-temperature incineration and purification module. The hair and the bones are pretreated through corresponding branches, respectively, and then hydrolyzed and pressed after confluence by a weighing feeder according to a preset mass ratio. The solid phase obtained through pressing is packaged after drying, crushing and screening. The pressing liquid forms filter residue, oil phase and water phase through pre-filter residue and oil-water sedimentation, and is recycled respectively. The equipment can reduce the load fluctuation during the common crushing and conveying of the hair and the bones, and realizes classified treatment and resourceful utilization of proteins, bone quality, oil and water phase.

Description

Technical Field

[0001] This invention relates to the field of waste treatment technology, and in particular to a complete set of equipment and methods for the miniaturized resource-based treatment of livestock and poultry waste. Background Technology

[0002] Livestock slaughtering and breeding processes generate waste such as wool, feathers, and bones. This waste contains keratin, oils, and inorganic bone. Direct dumping not only easily produces a foul odor but also wastes protein, oil, and bone resources. Current treatment methods typically include crushing, high-temperature and high-pressure hydrolysis or chemical transformation, pressing for oil separation, drying and pulverizing, and waste gas purification.

[0003] For example, Chinese invention patent application CN104028535A discloses a method and system for the harmless treatment of diseased and dead poultry and livestock. The system includes a high-temperature hydrolysis drying unit, a hydrolysis waste gas condensation unit, a tail gas secondary treatment unit, an oil pressing unit, and an oil purification and separation unit. The deodorized tail gas is then directed to an auxiliary heating boiler for combustion. This solution enables high-temperature treatment of diseased and dead poultry and livestock, oil recovery, and tail gas purification.

[0004] However, the existing technology still has the following shortcomings. First, wool raw materials are light and easily entangled, while bone raw materials are hard and easily deposited, making direct co-crushing and conveying prone to fluctuations in crushing load. Second, the hydrolyzed material contains oil, water, protein fibers, and bone residue, making it inconvenient to classify and utilize each phase through pressing and storage alone. Therefore, it is necessary to provide a complete set of equipment more suitable for the small-scale continuous processing of wool and bone mixtures. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, this application provides a complete set of equipment for the miniaturized resource-based treatment of livestock and poultry waste and its treatment method.

[0006] The present invention provides a complete set of equipment for the miniaturized resource-based treatment of livestock and poultry waste, which adopts the following technical solution: A complete set of miniaturized resource-based treatment equipment for livestock and poultry waste includes a dual-path pretreatment module, a quantitative confluence module, a continuous high-temperature and high-pressure hydrolysis module, a screw pressing module, a three-stage phase separation module, a drying, pulverizing and screening module, a finished product packaging module, and a high-temperature incineration purification module for treating the waste gas from each module. The dual-path pretreatment module includes a wool pretreatment branch and a bone pretreatment branch. The wool pretreatment branch and the bone pretreatment branch are respectively connected to the quantitative flow module through weighing feeders. The two weighing feeders control the start and stop of the two branches based on the cumulative feed amount, so that the wool and aggregate in each hydrolysis batch maintain a preset mass ratio. The quantitative flow module is connected in sequence to the continuous high temperature and high pressure hydrolysis module and the screw press module. The spiral pressing module has a solid phase outlet and a pressing liquid outlet. The solid phase outlet is sequentially connected to the drying, pulverizing, and screening module and the finished product packaging module. The pressing liquid outlet is connected to the three-stage phase diversion module. The three-stage phase diversion module includes a pre-filter, an oil-water settling tank, an oil collection tank, and an aqueous phase buffer tank, forming a filter residue recovery branch, an oil phase collection branch, and an aqueous phase collection branch, respectively. The pressing liquid outlet is sequentially connected to the pre-filter and the oil-water settling tank. The filter residue outlet of the pre-filter is connected to the solid phase outlet through the filter residue recovery branch. The oil-water settling tank is connected to the oil collection tank through the oil phase collection branch. The oil-water settling tank is connected to the aqueous phase buffer tank through the aqueous phase collection branch.

[0007] Preferably, the wool pretreatment branch includes a closed washing hopper, a loose conveying assembly, and a wool impurity removal screen connected in sequence; the aggregate pretreatment branch includes a closed washing aggregate hopper, an aggregate crusher, and an aggregate impurity removal screen connected in sequence; the wool and aggregate are respectively conveyed to the quantitative flow confluence module by a weighing feeder.

[0008] Preferably, the quantitative flow module includes a quantitative flow chamber, a low-speed mixer, and a closed screw conveyor; the discharge ends of the two weighing feeders are respectively connected to the quantitative flow chamber, and the quantitative flow chamber is connected to the continuous high-temperature and high-pressure hydrolysis module through the closed screw conveyor.

[0009] Preferably, the continuous high-temperature and high-pressure hydrolysis module includes a continuous high-temperature and high-pressure hydrolysis tank and a stirring assembly, a heating assembly, a temperature sensor, a pressure sensor, and a pressure relief valve disposed in the continuous high-temperature and high-pressure hydrolysis tank.

[0010] Furthermore, the inlet and outlet of the continuous high-temperature and high-pressure hydrolysis tank are respectively connected to a closed feeding device and a closed discharging device, which can adopt a pressure-resistant screw feeder structure; the volume of the continuous high-temperature and high-pressure hydrolysis tank can be 1m³. 3 The working temperature can be 140-160℃, and the working pressure can be 0.4-0.8MPa.

[0011] In the continuous hydrolysis configuration, the closed feeding device includes an automatic feeding closed screw and a pressure-resistant isolation component at the feeding end, and the closed discharging device includes an automatic discharging closed screw and a pressure-resistant isolation component at the discharging end; the PLC controls the conveying volume of the automatic feeding closed screw and the automatic discharging closed screw, so that the material passes through the continuous high temperature and high pressure hydrolysis tank continuously or intermittently in a quantitative manner, and maintains the continuous high temperature and high pressure hydrolysis tank at a preset hydrolysis environment of 140-160℃ and 0.4-0.8MPa during feeding and discharging.

[0012] Preferably, it also includes a low-temperature vacuum concentrator and a residue return conveyor. The outlet of the aqueous buffer tank is connected to the inlet of the low-temperature vacuum concentrator. The low-temperature vacuum concentrator is provided with a liquid protein concentrate outlet, a concentrated residue outlet, and a concentrated wastewater outlet. The concentrated residue outlet is connected to the drying, pulverizing, and screening module through the residue return conveyor. It also includes an anaerobic digester and a biogas transmission pipeline. The inlet of the anaerobic digester is connected to the outlet of the concentrated wastewater, and the biogas outlet of the anaerobic digester is connected to the fuel inlet of the high-temperature incineration purification module through the biogas transmission pipeline. The anaerobic digester is also equipped with a biogas slurry discharge pipeline. The aqueous buffer tank is connected to the water inlet of the continuous high-temperature and high-pressure hydrolysis tank through an aqueous phase reuse branch. The aqueous phase reuse branch is equipped with a filter, a reuse pump and a reuse valve. The aqueous buffer tank is also connected to a wastewater treatment unit through a discharge branch.

[0013] Preferably, the drying, pulverizing and screening module includes a mixing bin, a drum dryer, a hammer mill and a screening machine connected in sequence. The screening machine is provided with a qualified material outlet and a coarse material outlet. The qualified material outlet is connected to the finished product packaging module, and the coarse material outlet is connected to the feed inlet of the hammer mill or the mixing bin through a closed return conveyor.

[0014] Furthermore, the discharge end of the rotary drum dryer is equipped with a moisture detector to detect the moisture content of the dried material; the screening machine can be configured with a 40-80 mesh screen. The moisture detector, screening machine and finished product packaging module are electrically connected to the PLC control system to complete screening and quantitative packaging after the material reaches the preset moisture and particle size conditions.

[0015] Preferably, it also includes a buffer pressure relief discharge module, which is connected between the continuous high temperature and high pressure hydrolysis module and the screw press module. The buffer pressure relief discharge module includes a buffer pressure relief tank and a pressure detection port, a gas phase outlet and a bottom material outlet provided in the buffer pressure relief tank. The bottom material outlet is connected to the screw press module through a quantitative discharge device.

[0016] Preferably, it also includes a zoned negative pressure gas collection module, which includes an induced draft fan, a negative pressure gas collection main pipe, and gas collection branch pipes. The gas collection branch pipes are connected to the negative pressure gas collection main pipe through a check isolation component and a branch regulating valve. The wool pretreatment branch, the bone pretreatment branch, the continuous high temperature and high pressure hydrolysis module, the buffer pressure relief discharge module, the screw press module, and the drying, pulverizing, and screening module are respectively connected to the negative pressure gas collection main pipe through gas collection branch pipes. Each gas collection branch pipe is equipped with a pressure sensor. The negative pressure gas collection main pipe, the high temperature incineration purification module, and the induced draft fan are connected in sequence.

[0017] Furthermore, the high-temperature incineration purification module includes a high-temperature incinerator and a flue gas purification device connected in sequence. The high-temperature incinerator is equipped with a temperature detector and a combustion regulator, and its operating temperature can be 800-1100℃, so as to carry out centralized heat treatment of hydrolysis tail gas, depressurized gas, pressing waste gas and drying tail gas. The treated flue gas is discharged after passing through the flue gas purification device.

[0018] Preferably, the system further includes a waste heat grading and recovery module, which includes a high-temperature heat exchanger, a low-temperature heat exchanger, and a flue gas bypass regulating branch. The high-temperature heat exchanger is connected to the flue gas outlet of the high-temperature incineration purification module, and the heated side of the high-temperature heat exchanger is connected to the heating end of the continuous high-temperature and high-pressure hydrolysis module. The low-temperature heat exchanger is connected downstream of the flue gas from the high-temperature heat exchanger, and the heated side of the low-temperature heat exchanger is connected to the hot air inlet of the drying, pulverizing, and screening module. The flue gas bypass regulating branch is connected between the high-temperature heat exchanger and the low-temperature heat exchanger.

[0019] Preferably, the waste heat grading and reuse module further includes a condensate collection unit and a preheating water tank. The heating end of the continuous high temperature and high pressure hydrolysis module has a condensate outlet. The condensate outlet is connected to the preheating water tank through the condensate collection unit. The preheating water tank is connected to the water inlet of the continuous high temperature and high pressure hydrolysis module.

[0020] Furthermore, the complete set of equipment adopts a modular and enclosed layout. The PLC control system is electrically connected to the weighing feeder, conveying equipment, temperature and pressure sensors of the continuous high temperature and high pressure hydrolysis tank, buffer pressure relief discharge module, screw press module, moisture detector, screening machine, finished product packaging module, zoned negative pressure gas collection module and high temperature incineration purification module, respectively, to coordinate the operation of each module according to the preset program.

[0021] This invention also provides a method for the miniaturized resource-based treatment of livestock and poultry waste, implemented using the aforementioned complete set of equipment, comprising the following steps: Livestock and poultry waste is classified into wool and bone. After receiving, removing iron, washing, loosening and screening, the wool enters the wool weighing feeder. After receiving, removing iron, washing, crushing and screening, the bone enters the bone weighing feeder. The start and stop of the two weighing feeders are controlled according to the cumulative feeding amount, so that the wool and bone are combined, mixed and conveyed in a closed system according to the preset mass ratio.

[0022] The converging materials are fed into a continuous high-temperature and high-pressure hydrolysis tank via an automatic feeding sealed screw and a pressure-resistant isolation component at the feeding end. Hydrolysis is carried out under heating and stirring conditions, and the materials are discharged via an automatic discharging sealed screw and a pressure-resistant isolation component at the discharging end. This ensures that the continuous high-temperature and high-pressure hydrolysis tank maintains the preset hydrolysis temperature and pressure during feeding and discharging. The discharged hydrolyzed material is then fed into a screw press module after buffering, depressurization, and flow regulation to obtain the solid phase and the press liquor.

[0023] The solid phase is fed into the drying, pulverizing and screening module for processing and qualified materials are packaged. The pressing liquid is subjected to pre-filter residue and oil-water sedimentation in sequence to form filter residue, oil phase and water phase. The filter residue is returned to the solid phase treatment path, the oil phase is collected, and the water phase is selected for reuse in hydrolysis, low temperature vacuum concentration or entering the wastewater treatment unit according to the water replenishment requirements of hydrolysis, the liquid level of the water phase buffer tank and the water phase detection results.

[0024] Furthermore, the concentrated residue obtained from low-temperature vacuum concentration is returned to the solid phase treatment path, the concentrated wastewater is subjected to anaerobic fermentation, and the resulting biogas is sent to the high-temperature incineration purification module for auxiliary combustion; the waste gas generated in each treatment process is collected by the partitioned negative pressure gas collection module and sent to the high-temperature incineration purification module, the high-grade heat of the incineration flue gas is used to heat the hydrolysis process, and the remaining heat is used to provide hot air to the drying process.

[0025] The beneficial effects of this invention are as follows: 1. By setting up pre-treatment branches for wool and aggregate, pre-treatment is carried out on the physical properties of wool that are easy to entangle and aggregate that are hard and easy to deposit, respectively, so as to avoid the direct crushing of wool and aggregate, which would cause equipment entanglement, jamming and load fluctuation, and improve the stability of the front-end pre-treatment and conveying process. 2. The start and stop of the pretreatment branches for raw materials and aggregates are controlled by the weighing feeder according to the cumulative feed amount, so that each batch of raw materials and aggregates maintains the preset mass ratio and enters the hydrolysis process after quantitative convergence. This is conducive to stabilizing the feed amount, bulk density and mixing state, and improving the consistency of subsequent hydrolysis and pressing effects. 3. The hydrolyzed material is initially separated into solid phase and pressing liquid through the screw press module. The solid phase is dried, crushed and screened to form the finished product, realizing the centralized recovery of protein fiber and bone resources, forming a continuous solid phase processing path, and improving the processing efficiency and resource utilization of solid phase materials. 4. The pressing liquid is separated into filter residue, oil phase and water phase through a pre-filter and an oil-water settling tank. The filter residue is returned to the solid phase treatment path, and the oil phase and water phase are collected separately, which reduces the loss of solid resources with the liquid phase and improves the classification and recovery of protein, bone, oil and water phase. 5. By centrally treating the waste gas generated by each treatment module through high-temperature incineration purification module, the unorganized emission of dust and odor gases during the pretreatment, hydrolysis, pressing and drying of animal hair can be reduced, the closed treatment capacity of the whole set of equipment can be improved, and the impact of the resource utilization process of livestock and poultry waste on the surrounding environment can be reduced. 6. By selectively reusing the aqueous phase obtained from oil-water separation for hydrolysis or sending it to a low-temperature vacuum concentrator, water-soluble proteins in the aqueous phase can be further recovered. The concentrated residue is returned to the solid phase drying path, and the biogas produced by the anaerobic fermentation of the concentrated wastewater is used for combustion assistance in the high-temperature incineration purification module, thereby reducing the direct emission of organic matter in the aqueous phase and reducing the external fuel consumption in the incineration process. 7. By standardizing and modularizing the arrangement of each processing module and adopting centralized control by PLC, the equipment can be configured to process about 1 ton of raw materials per day. The feeding, hydrolysis, depressurization, pressing, phase separation, drying, screening, packaging and waste gas treatment are linked together, which is suitable for small and medium-sized application entities to process livestock and poultry waste on-site or in the near field. 8. By combining solid-phase drying and powdering, oil phase recovery, low-temperature concentration of aqueous phase, recirculation of concentrated residue and anaerobic fermentation of concentrated wastewater, a multi-path utilization method can be formed, which includes solid protein materials, liquid protein concentrates, recovered oils and biogas, thereby improving the recovery rate of protein and oil resources in hair, bone and attached soft tissue. 9. By combining zoned negative pressure gas collection, high-temperature incineration, flue gas purification and waste heat recovery, the steam, dust and odor gases generated in each process can be centrally treated, and the heat from the incineration flue gas can be used for hydrolysis heating and drying hot air respectively, thus taking into account both centralized treatment of waste gas and energy recovery. 10. By setting up iron removal, cleaning, cutting or crushing and closed conveying structures at the pretreatment end, the impact of metal foreign objects, mud and sand and large-sized hair on subsequent equipment can be reduced; through automatic feeding closed screw, automatic discharging closed screw and pressure-resistant isolation components at both ends, the temperature and pressure conditions of the continuous high temperature and high pressure hydrolysis tank can be maintained during the feeding and discharging process, reducing the processing interval caused by repeated heating and pressurization, and improving continuous processing capacity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structural principle of the present invention; Figure 2 This is a schematic diagram of the connection principle of the partitioned negative pressure gas collection module of the present invention; Figure 3 This is a schematic diagram of the connection principle of the waste heat grading and reuse module of the present invention; Figure 4 This is a schematic diagram of the structure of the closed spiral for feeding and discharging materials of the present invention; Figure 5 This is a schematic diagram of the crescent-shaped cutting blade of the closed spiral for feeding and discharging of materials according to the present invention. Detailed Implementation

[0027] The following will combine Figures 1-5 The present invention will be further illustrated by the embodiments.

[0028] This embodiment discloses a complete set of equipment for the miniaturized resource-based treatment of livestock and poultry waste and its treatment method.

[0029] Reference Figures 1 to 5 The complete set of equipment for miniaturized resource-based treatment of livestock and poultry waste includes a dual-path pretreatment module for treating livestock and poultry waste such as pig hair, chicken feathers, pig bones, and chicken bones; a quantitative confluence module; a continuous high-temperature and high-pressure hydrolysis module; a screw pressing module; a three-stage phase separation module; a drying, crushing, and screening module; a finished product packaging module; and a high-temperature incineration purification module for treating the waste gas from each module.

[0030] The dual-path pretreatment module includes a wool pretreatment branch and a aggregate pretreatment branch. The wool and aggregate pretreatment branches are connected to the quantitative flow module via weighing feeders. The two weighing feeders control the start and stop of the two branches based on the cumulative feed amount, so that the wool and aggregate in each hydrolysis batch maintain a preset mass ratio. The quantitative flow module is connected to the continuous high-temperature and high-pressure hydrolysis module and the screw press module in sequence. By setting up the dual-path pretreatment module, the wool and aggregate are avoided from being directly processed in the same crusher, reducing the probability of wool fibers entangled on the crushing shaft. The aggregate plays a role in loosening the wool and improving the bulk density of the mixture. At the same time, it solves the problem that the wool raw material is easy to entangle and the aggregate raw material is hard and easy to deposit, which can easily cause fluctuations in crushing load when directly crushed and transported together.

[0031] The screw press module has a solid phase outlet and a pressing liquid outlet. The solid phase outlet is sequentially connected to the drying, pulverizing, and screening module and the finished product packaging module, while the pressing liquid outlet is connected to a three-stage phase separation module. The three-stage phase separation module includes a pre-filter, an oil-water settling tank, an oil collection tank, and an aqueous phase buffer tank, forming filter residue recovery branches, oil phase collection branches, and aqueous phase collection branches, respectively. The pressing liquid outlet is sequentially connected to the pre-filter and the oil-water settling tank. The filter residue outlet of the pre-filter is connected to the solid phase outlet of the screw press module via the filter residue recovery branch, allowing residual protein fibers and fine bone residue in the pressing liquid to re-enter the solid phase material, reducing the loss of solid resources with the liquid phase and minimizing the interference of solid impurities on the subsequent oil-water settling process. The upper oil phase outlet of the oil-water settling tank is connected to the oil collection tank via the oil phase collection branch, and the lower aqueous phase outlet of the oil-water settling tank is connected to the aqueous phase buffer tank via the aqueous phase collection branch, thus utilizing the density difference between the oil and aqueous phases to achieve stratified collection. Through the above setup, the mixed pressing liquid generated by the screw press can be further separated into filter residue, oil phase and water phase, so that solid materials, oil and water phase can enter the corresponding recycling or post-treatment paths respectively, thereby improving the classification and recycling effect of protein, bone and oil in livestock and poultry waste. It solves the problem that the hydrolyzed material contains oil phase, water phase, protein fiber and bone residue at the same time, and it is not convenient to classify and utilize each phase by pressing and storage alone. At the same time, it reduces the oil content and suspended solids content in the subsequent water phase treatment process.

[0032] The continuous high-temperature and high-pressure hydrolysis module includes a continuous high-temperature and high-pressure hydrolysis tank and a stirring assembly, a heating assembly, a temperature sensor, a pressure sensor, and a pressure relief valve installed within the tank. The continuous high-temperature and high-pressure hydrolysis tank is a sealed tank capable of withstanding preset temperatures and pressures. Its inlet is connected to the outlet of a quantitative manifold module to receive raw materials and aggregates flowing in a preset ratio. The stirring assembly includes a stirring shaft inside the continuous high-temperature and high-pressure hydrolysis tank, stirring components connected to the stirring shaft, and a stirring drive component outside the tank and connected to the stirring shaft. The stirring assembly uses low-speed agitation to keep the lighter, easily floating raw materials mixed with the heavier, easily settling aggregates, increasing the contact between the two types of raw materials and the hydrolysis medium, and reducing localized agglomeration of raw materials and concentrated deposition of aggregates.

[0033] The heating components can be a steam jacket installed around the periphery of the continuous high-temperature and high-pressure hydrolysis tank, a steam inlet pipe installed inside the continuous high-temperature and high-pressure hydrolysis tank, or a heat exchanger forming a circulating heat exchange loop with the continuous high-temperature and high-pressure hydrolysis tank, used to provide the heat required for hydrolysis to the mixture inside the continuous high-temperature and high-pressure hydrolysis tank. Temperature and pressure sensors are used to detect the temperature and pressure inside the continuous high-temperature and high-pressure hydrolysis tank, respectively, so as to adjust the heat supply of the heating components according to the detection results, so as to maintain the internal temperature and pressure of the continuous high-temperature and high-pressure hydrolysis tank within the preset hydrolysis temperature and pressure range. A pressure relief valve is installed at the gas phase outlet of the continuous high-temperature and high-pressure hydrolysis tank, used to control the discharge of high-temperature gas inside the tank after hydrolysis, and to provide pressure relief protection when the pressure inside the tank exceeds a preset safety value. The outlet of the pressure relief valve is connected to the high-temperature incineration purification module, so that the high-temperature odor gas generated by pressure relief enters the high-temperature incineration purification module for treatment, reducing the escape of waste gas into the surrounding environment.

[0034] By combining heating components, stirring components, temperature sensors, and pressure sensors, relatively uniform high-temperature and high-pressure hydrolysis of raw materials and aggregates can be carried out in a closed environment. On the one hand, the high-temperature and high-pressure conditions are used to sterilize the raw materials and hydrolyze the keratin structure of the hair. On the other hand, continuous stirring improves the heat and mass transfer conditions between the aggregates and the hydrolysis medium, thereby reducing the possibility of inconsistent hydrolysis degrees of materials in different locations.

[0035] In a preferred continuous hydrolysis embodiment, a quantitative manifold is connected to the inlet of the continuous high-temperature and high-pressure hydrolysis tank via an automatic feeding sealed screw, and the outlet of the continuous high-temperature and high-pressure hydrolysis tank is connected to a buffer pressure relief tank via an automatic discharge sealed screw; pressure-resistant isolation components are respectively installed at the inlet and outlet ends. During operation, the PLC controls the rotation speed and start / stop of the two sealed screws based on the liquid level, temperature, and pressure of the continuous high-temperature and high-pressure hydrolysis tank, so that the continuous high-temperature and high-pressure hydrolysis tank maintains a temperature and pressure state within the range of 140-160℃ and 0.4-0.8MPa, and allows livestock and poultry waste such as pig hair, chicken feathers, pig bones, and chicken bones to continuously or quantitatively enter and exit the continuous high-temperature and high-pressure hydrolysis tank in short cycles, realizing long-term continuous temperature and pressure maintenance operation in the hydrolysis tank and improving processing efficiency.

[0036] Automatic feeding sealed screw and automatic discharging sealed screw are respectively installed on the feed side and discharge side of the hydrolysis tank. Both include a sealed outer tube 1, a screw shaft 2 rotatably installed inside the sealed outer tube 1, screw blades 3 installed on the outer periphery of the screw shaft 2, and heat-insulating and pressure-maintaining baffles 4. The screw shaft 2 is connected to the drive mechanism for transmission.

[0037] The heat-insulating and pressure-holding baffle 4 extends axially along the spiral shaft 2, with its two axial ends connected to two axially adjacent spiral blades 3 respectively. The radial height of the heat-insulating and pressure-holding baffle 4 is basically the same as the radial height of the spiral blades 3, and its outer edge is close to the inner wall of the sealed outer tube 1, maintaining a small gap between it and the inner wall of the sealed outer tube 1 to meet the rotation requirements. The heat-insulating and pressure-holding baffle 4 rotates synchronously with the spiral shaft 2, generating obstruction, scraping, and compaction effects on the material, causing the material to form a material sealing section between the heat-insulating and pressure-holding baffle 4, adjacent spiral blades 3, and sealed outer tube 1, thereby reducing the gas flow space directly penetrating axially in the sealed outer tube 1 and reducing the leakage of heat and pressure in the hydrolysis tank during continuous feeding and discharging.

[0038] The feed inlet 6 of the automatic feeding sealed screw is located at the axial end of the sealed outer tube 1 and extends outward along the axial direction of the sealed outer tube 1. The feed inlet 6 can adopt a feed channel with a square or rectangular cross-section, and its axial length is appropriately extended compared with the conventional radial short feed inlet to increase the material holding space and feed cross-sectional area. The outer end of the feed inlet 6 can be directly connected to the feeding device or form an open feeding end, and its inner end is coaxially connected with the sealed outer tube 1.

[0039] The end of the spiral shaft 2 facing the feed inlet 6 extends coaxially into the feed inlet 6, and the shaft section located inside the feed inlet 6 forms the feed cutting section. The feed cutting section can be a cylindrical shaft with multiple crescent-shaped cutting blades 8 on its outer circumference. The crescent-shaped cutting blades 8 are separate arc-shaped thin sheet structures, with their roots fixedly connected to the outer circumferential surface of the cylindrical shaft, forming an arc-shaped cutting edge on the outside and having a sharp blade tip.

[0040] Multiple crescent-shaped cutting blades 8 are spaced apart along the axial direction of the spiral shaft 2, and adjacent crescent-shaped cutting blades 8 are staggered by a predetermined angle in the circumferential direction of the spiral shaft 2, so that the tips of each crescent-shaped cutting blade 8 form a spatial spiral trajectory extending around the cylindrical shaft along the axial direction of the spiral shaft 2. In other words, the crescent-shaped cutting blades 8 are not arranged in two parallel rows along the upper and lower sides of the cylindrical shaft, but are distributed sequentially at different circumferential positions of the cylindrical shaft as their axial positions change, with their overall orientation consistent with the spiral direction of the spiral blades 3.

[0041] When the automatic feeding closed screw is in operation, the feeding cutting section rotates with the screw shaft 2. The crescent-shaped cutting blades 8, arranged in a spiral pattern, push the raw material, aggregate, and attached soft tissue in the feed inlet 6 into the closed outer tube 1. At the same time, the arc-shaped cutting edges and sharp tips of the crescent-shaped cutting blades 8 cut and break up long fibers, fascia, and clumps of material. Because the axially adjacent crescent-shaped cutting blades 8 are staggered in the circumferential direction, they can continuously contact the material from different directions, enhancing the material feeding capacity while reducing material entanglement, bridging, and blockage of the feed inlet 6. The material after preliminary cutting enters the closed outer tube 1 and is further conveyed to the hydrolysis tank by the screw blades 3.

[0042] When the automatic discharge sealed screw conveyor is in operation, the hydrolyzed material enters the sealed outer tube 1. The screw shaft 2 drives the screw blades 3 and the heat-insulating and pressure-maintaining baffle 4 to rotate, gradually pushing the material to the discharge port 7. The side of the screw blades 3 facing the incoming material can form a cutting blade to further cut off the not-yet-completely separated fibers, fascia, or soft tissue during the conveying process. This cutting blade can be formed by grinding the edge of the screw blades 3 facing the material, so it does not need to be labeled as an independent component. The heat-insulating and pressure-maintaining baffle 4 scrapes and compacts the material during the discharge process, keeping the material at a certain filling density and reducing the possibility of high-temperature gas and pressure in the hydrolysis tank leaking directly out through the discharge channel.

[0043] The control system can adjust the speed, direction of rotation, start / stop cycle, and single-run time of the automatic feeding sealed screw and the automatic discharging sealed screw, thereby controlling the feed and discharge rates per unit time. The automatic feeding sealed screw uses a crescent-shaped cutting blade 8 to complete material feeding and pre-cutting, and uses the screw blades 3 and the heat-insulating and pressure-maintaining baffles 4 to complete sealed conveying; the automatic discharging sealed screw uses the screw blades 3 and the heat-insulating and pressure-maintaining baffles 4 to complete quantitative discharge and dynamic heat-insulating and pressure-maintaining.

[0044] The wool pretreatment branch includes a closed-loop washing hopper, a loosening conveying assembly, and a wool impurity removal screen connected in sequence. The closed-loop washing hopper is used to temporarily store and limit the escape of wool and its odor. At the same time, the closed-loop washing hopper is also used to remove iron and clean the wool. The loosening conveying assembly is used to break up the agglomerated wool and output it continuously without high-intensity shearing. For example, low-speed feeding, flexible feeding teeth, or low-speed screw conveying can be used to gradually break up the tangled and agglomerated wool and output it continuously without high-intensity shearing, so that the wool passes through the wool impurity removal screen and the corresponding weighing feeder in a relatively uniform state.

[0045] The bone pretreatment branch includes a closed-loop washing aggregate hopper, an aggregate crusher, and an aggregate removal screen connected in sequence. The closed-loop washing aggregate hopper temporarily stores the bone raw materials and continuously feeds them to the aggregate crusher. It also removes iron and cleans the aggregate. The aggregate crusher breaks down larger bones into particles suitable for conveying, mixing, and hydrolysis, increasing the contact area between the bone raw materials and the hydrolysis medium, shortening the distance heat transfer to the interior of the bone particles, and reducing the possibility of large-sized aggregates depositing or getting stuck in the quantitative manifold module or continuous high-temperature and high-pressure hydrolysis tank. The aggregate removal screen removes hard foreign objects and materials that do not meet the preset particle size requirements from the bone raw materials, reducing their impact on subsequent sealed conveying equipment and the mixing components of the continuous high-temperature and high-pressure hydrolysis tank.

[0046] Finally, the pre-treated raw materials and aggregates are conveyed to the quantitative flow module by corresponding weighing feeders. The two weighing feeders measure the feed amount of raw materials and aggregates, ensuring that the two types of raw materials are incorporated into the quantitative flow module according to a preset mass ratio. By pre-treating the raw materials and aggregates separately to suit their physical properties before weighing and concentrating, it is possible to prevent raw materials from entering the aggregate crusher and becoming entangled in the crushing components, and to reduce the impact of aggregate raw materials on the loose conveying components of the raw materials. At the same time, it helps to maintain a relatively stable ratio of raw materials to aggregates, feed amount, and bulk density in each hydrolysis batch, which is beneficial to improving the operational stability of subsequent mixing, hydrolysis, and pressing processes.

[0047] Before entering the dual-path pretreatment module, the material composition of livestock and poultry is first classified. Feathers, poultry feathers, animal hair, and lightweight waste mainly composed of hair fibers are classified as wool, while livestock and poultry bones, bone fragments, and bone waste with a small amount of fascia or residual meat are classified as aggregate. During classification, non-livestock and poultry foreign objects such as plastics, metals, stones, and ropes can be removed by manual sorting or mechanical separation. For mixed raw materials containing both hair, bone, and soft tissue, they are classified according to their main components. Hair and bone that can be clearly separated are put into their respective hoppers. Among them, wool enters a closed washing wool hopper for loosening and impurity removal, and aggregate enters a closed washing aggregate hopper for crushing and impurity removal. The classification process does not require fine purification of wool and aggregate, and allows a small amount of residual meat, fascia, fat, or skin tissue to be retained.

[0048] The quantitative mixing module includes a quantitative mixing chamber, a low-speed mixer located within the quantitative mixing chamber, and a closed screw conveyor connected to the discharge port of the quantitative mixing chamber. Two weighing feeders are connected to the quantitative mixing chamber, which is connected to the inlet of the continuous high-temperature and high-pressure hydrolysis module via the closed screw conveyor. The low-speed mixer includes a mixing shaft rotating within the quantitative mixing chamber, mixing components located around the mixing shaft, and a mixing drive component connected to the mixing shaft. The mixing components can be paddles, ribbons, or spaced-apart push rods, used to agitate the raw materials and aggregates entering the quantitative mixing chamber at a lower speed, dispersing the aggregate particles among the loose raw materials. This low-speed mixing method reduces the possibility of excessive shearing of the raw materials by high-speed mixing or the possibility of raw materials entangled on the mixing shaft. Furthermore, the separation and loosening effect of the aggregate particles on agglomerated raw materials reduces the probability of bridging, clumping, or concentrated accumulation of raw materials within the quantitative mixing chamber.

[0049] The inlet of the enclosed screw conveyor is connected to the outlet of the quantitative manifold, and its outlet is connected to the continuous high-temperature and high-pressure hydrolysis module. It is used to quantitatively transport the proportioned and pre-mixed materials to the continuous high-temperature and high-pressure hydrolysis module. During the conveying process, the enclosed screw conveyor can also continuously push and assist in mixing the raw materials and aggregates, ensuring that the mixture enters the continuous high-temperature and high-pressure hydrolysis module in a relatively uniform state. The enclosed shell of the screw conveyor can limit the outward diffusion of lint, dust, and odors. Ultimately, through the sequential coordination of weighing feeding, low-speed mixing, and enclosed screw conveying, the consistency of material proportions, loading amounts, and mixing states across different batches can be improved, providing a relatively stable processing load for the subsequent hydrolysis process.

[0050] The aqueous phase buffer tank is connected to the makeup water inlet of the continuous high-temperature and high-pressure hydrolysis tank via an aqueous phase reuse branch. The aqueous phase reuse branch is equipped with a filter, a reuse pump, and a reuse valve sequentially along the aqueous phase transport direction. The aqueous phase buffer tank temporarily stores the aqueous phase obtained from the oil-water settling tank and buffers changes in the aqueous phase flow rate, preventing the aqueous phase discharged from the oil-water settling tank from directly entering the continuous high-temperature and high-pressure hydrolysis tank and causing fluctuations in the makeup water volume. The filter further removes residual fine bone residue, protein fibers, and other suspended impurities from the aqueous phase, reducing the deposition or blockage of impurities in the aqueous phase reuse branch, the makeup water inlet of the continuous high-temperature and high-pressure hydrolysis tank, and the reuse pump. The reuse pump transports the filtered aqueous phase to the continuous high-temperature and high-pressure hydrolysis tank, and the reuse valve controls the on / off state of the aqueous phase reuse branch and the reuse flow rate, ensuring that the reused aqueous phase is added quantitatively according to the actual makeup water requirements of the continuous high-temperature and high-pressure hydrolysis tank.

[0051] The aqueous buffer tank is also equipped with a liquid level sensor. When the liquid level in the aqueous buffer tank reaches the preset reuse level and the continuous high temperature and high pressure hydrolysis tank requests water replenishment, the reuse valve is opened and the reuse pump is started. When the continuous high temperature and high pressure hydrolysis tank reaches the preset water replenishment amount or the liquid level in the aqueous buffer tank is lower than the preset level, the reuse valve is closed and the reuse pump is stopped, thereby avoiding the reuse pump running dry and the continuous high temperature and high pressure hydrolysis tank being replenished with too much water.

[0052] The aqueous phase buffer tank is also connected to the wastewater treatment unit via a discharge branch. A discharge valve is installed on this branch. When the oil content, suspended solids content, or other indicators of the aqueous phase are unsuitable for reuse, or when the amount of aqueous phase in the buffer tank exceeds the makeup water requirement of the continuous high-temperature and high-pressure hydrolysis tank, the reuse valve can be closed and the discharge valve opened, allowing the aqueous phase to enter the wastewater treatment unit for further treatment. By setting up independent aqueous phase reuse and discharge branches, the reuse or discharge path can be selected according to the aqueous phase state and hydrolysis makeup water requirements. This reduces the amount of fresh makeup water and wastewater discharge, while also reducing the possibility of unsuitable aqueous phases entering the continuous high-temperature and high-pressure hydrolysis tank and affecting subsequent hydrolysis stability.

[0053] Furthermore, another outlet of the aqueous phase buffer tank is connected to the inlet of the low-temperature vacuum concentrator. Control valves are installed on both the aqueous phase reuse branch and the concentration branch leading to the low-temperature vacuum concentrator. The PLC controls the on / off state of the two branches based on the water replenishment requirements of the continuous high-temperature and high-pressure hydrolysis tank, the liquid level in the aqueous phase buffer tank, and the aqueous phase detection results. This allows a portion of the aqueous phase meeting the reuse conditions to return to the continuous high-temperature and high-pressure hydrolysis tank for circulating hydrolysis via the aqueous phase reuse branch, while the remaining aqueous phase is sent to the low-temperature vacuum concentrator for processing. Thus, the aqueous phase does not simultaneously and uncontrolledly enter both the continuous high-temperature and high-pressure hydrolysis tank and the low-temperature vacuum concentrator, avoiding interference between the reuse volume and the concentration processing volume.

[0054] The low-temperature vacuum thickener unit includes a thickening tank, a vacuum assembly, a condenser assembly, and a thickening residue outlet located at the bottom of the thickening tank. The liquid protein concentrate outlet of the thickening tank is connected to the liquid protein concentrate collection end, and the condenser assembly forms the concentrated wastewater outlet. During operation, the aqueous phase can be concentrated under low-temperature vacuum conditions of approximately 60°C. In a specific operating condition, the liquid protein concentrate can be concentrated to a solids content of not less than 40%. After subsequent testing or treatment to meet the corresponding requirements, the liquid protein concentrate is used as a raw material for liquid protein feed. The viscous thickening residue deposited at the bottom of the thickening tank is sent to a mixing silo via a residue return conveyor, where it is dried together with the solid phase obtained from the screw press and the filter residue obtained from the pre-filter.

[0055] The inlet of the anaerobic digester is connected to the concentrated wastewater outlet of the low-temperature vacuum concentrator. Its biogas outlet is connected to the fuel inlet of the high-temperature incineration purification module via a biogas delivery pipeline. The biogas delivery pipeline is equipped with a dehydration component, a flame arrester, and a flow regulating valve, ensuring that the biogas produced by anaerobic fermentation, after dehydration and flame arrest, is used as auxiliary fuel and sent to the high-temperature incineration purification module. The anaerobic digester also has a biogas slurry discharge pipeline. The fermented biogas slurry undergoes further treatment and testing to meet relevant discharge or agricultural requirements before being discharged or utilized as a resource. This setup creates a continuous treatment path that integrates protein concentration and recovery from the aqueous phase, residue recirculation, anaerobic wastewater fermentation, and biogas combustion.

[0056] The drying, pulverizing, and screening module comprises a mixing hopper, a rotary drum dryer, a hammer mill, and a screening machine connected in sequence. The feed end of the mixing hopper is connected to the solid phase outlet of the screw press module and the filter residue recovery branch of the pre-filter, collecting the solid material after pressing, dehydration, and deoiling, as well as the protein fibers and fine bone residue retained by the pre-filter. Furthermore, a low-speed mixing component is installed within the mixing hopper to uniformly mix solid materials with different moisture contents and particle sizes, reducing the possibility of localized high moisture or oil content causing adhesion to the inner wall of the rotary drum dryer, and ensuring a relatively stable material load entering the dryer.

[0057] A rotary drum dryer is used to tumble and dry mixed solid materials. As the drum rotates, the material is repeatedly lifted, scattered, and comes into contact with hot air, gradually dispersing any agglomerated wet material. This increases the contact area between the material and the hot air, improving drying uniformity. The discharge end of the rotary drum dryer connects to a hammer mill, allowing the dried bovine protein materials, bone materials, and recycled filter residue to enter the grinding process. Drying before grinding reduces the probability of wet, sticky materials adhering to the hammer mill blades or clogging the screen, and minimizes the impact of material moisture content fluctuations on particle size.

[0058] Hammer mills are used to impact-crush dried solid materials, and their discharge end is connected to a screening machine. The screening machine has a qualified material outlet and a coarse material outlet. The qualified material outlet connects to the finished product packaging module, allowing materials with a preset particle size to enter the packaging process. The coarse material outlet connects to the hammer mill's inlet or mixing hopper via a closed return conveyor, allowing coarse material that does not reach the preset particle size to re-enter the crushing process, or to mix with newly entering wet material and undergo further drying and crushing. For example, when coarse material returns to the hammer mill's inlet, it can re-crush insufficiently crushed bone particles, improving the consistency of the finished product's particle size. Alternatively, when coarse material returns to the mixing hopper, the dried coarse material can mix with newly entering wet solid material, absorbing some surface moisture and oil, reducing the adhesion of the mixture, and improving the feed dispersion in the drum dryer. The closed return conveyor limits the outward diffusion of dust and odors generated during the return process. Thus, the drying, pulverizing, and screening module forms a closed-loop processing path of "drying-pulverizing-screening-coarse material return", which reduces the direct entry of unqualified coarse material into the finished product, while improving the drying uniformity, pulverization degree, and particle size stability of the solid material.

[0059] It also includes a buffer pressure relief discharge module, connected between the continuous high-temperature and high-pressure hydrolysis module and the screw press module. This module receives the high-temperature and high-pressure material after hydrolysis and releases pressure and buffers the discharge flow before the material enters the screw press module. The buffer pressure relief discharge module includes a buffer pressure relief tank and a pressure detection port, a gas phase outlet, and a bottom material outlet located within it. The inlet of the buffer pressure relief tank is connected to the outlet of the continuous high-temperature and high-pressure hydrolysis tank via a pressure-resistant discharge pipe. A pressure-resistant discharge valve is installed on the pressure-resistant discharge pipe to control the flow of hydrolyzed material from the continuous high-temperature and high-pressure hydrolysis tank into the buffer pressure relief tank. A pressure sensor is installed at the pressure detection port to detect the real-time pressure inside the buffer pressure relief tank. The gas phase outlet is located at the top of the buffer pressure relief tank and connected to a high-temperature incineration purification module to discharge the steam and odorous gases released after the material enters the buffer pressure relief tank, reducing the direct discharge of high-temperature odorous gases into the surrounding environment. The bottom material outlet is connected to the screw press module via a quantitative discharge device. This device can be a variable frequency screw feeder, rotary feeder, or other closed feeding device capable of adjusting the discharge rate. It is used to deliver material to the screw press module at a relatively stable flow rate after the pressure in the buffer pressure relief tank drops to the preset discharge pressure. Ultimately, by setting up a buffer pressure relief tank between the continuous high-temperature and high-pressure hydrolysis tank and the screw press module, the high-temperature and high-pressure batch discharge from the continuous high-temperature and high-pressure hydrolysis tank can be transformed into a continuous discharge with reduced pressure and a relatively stable flow rate. This avoids direct impact of high-temperature and high-pressure material on the screw press module, reducing material spraying, blockage, and excessive instantaneous load on the screw press module. Simultaneously, the buffer pressure relief tank creates a material buffer between the intermittent hydrolysis at the front end and the continuous pressing at the rear end, thereby improving the stability of the connection between the hydrolysis, pressure relief, and pressing processes.

[0060] The equipment also includes a zoned negative pressure gas collection module, which comprises an induced draft fan, a negative pressure gas collection main pipe, and multiple gas collection branch pipes. Each gas collection branch pipe is connected to the negative pressure gas collection main pipe via a check valve and a branch regulating valve. The negative pressure gas collection main pipe, the high-temperature incineration purification module, and the induced draft fan are connected in sequence. Based on this, when the induced draft fan is running, it creates negative pressure in the negative pressure gas collection main pipe and each gas collection branch pipe, causing the dust, vapor, and odorous gases generated by each treatment module to flow into the negative pressure gas collection main pipe along the corresponding gas collection branch pipes and be centrally transported to the high-temperature incineration purification module for treatment.

[0061] The wool pretreatment branch, bone pretreatment branch, continuous high-temperature and high-pressure hydrolysis module, buffer pressure relief discharge module, screw press module, and drying, pulverizing, and screening module are each connected to the negative pressure gas collection main pipe via corresponding gas collection branch pipes. Specifically, the gas collection branch pipes corresponding to the wool and bone pretreatment branches can be connected to the gas phase space of the closed-loop wool washing hopper, closed-loop aggregate washing hopper, and quantitative manifold, respectively, to collect dust and odorous gases generated during feeding, loosening, crushing, and manifolding processes. The gas collection branch pipes corresponding to the continuous high-temperature and high-pressure hydrolysis module and the buffer pressure relief discharge module are connected to the pressure relief port of the continuous high-temperature and high-pressure hydrolysis tank and the gas phase outlet of the buffer pressure relief tank, respectively, to collect high-temperature steam and high-concentration odorous gases generated during hydrolysis and pressure relief processes. The gas collection branch pipes corresponding to the screw press module and the drying, pulverizing, and screening module are connected to the equipment cover or exhaust port, respectively, to collect odorous gases and dust generated during pressing, drying, pulverizing, and screening processes.

[0062] In addition, a check valve is installed between the corresponding gas collection branch pipe and the negative pressure gas collection main pipe to allow exhaust gas to flow unidirectionally from each treatment module to the negative pressure gas collection main pipe, while preventing exhaust gas in the negative pressure gas collection main pipe from flowing back into non-operating treatment modules. Branch regulating valves are used to adjust the flow area of ​​the corresponding gas collection branch pipe to distribute the extraction air volume according to the operating status and gas production of different treatment modules. For example, when the continuous high-temperature and high-pressure hydrolysis tank or buffer pressure relief tank is depressurized, the opening of the branch regulating valve of the corresponding gas collection branch pipe can be increased. For treatment modules that are not operating or have a small gas production volume, the corresponding branch regulating valve can be decreased or closed, thereby reducing the amount of ineffective air entering the negative pressure gas collection main pipe. Each gas collection branch pipe is also equipped with a pressure sensor to detect the negative pressure of the branch between the corresponding treatment module and the negative pressure gas collection main pipe.

[0063] With the above settings, zoned gas collection and airflow adjustment can be implemented according to the different gas production periods and volumes of each processing module. This reduces the intake of ineffective air into non-operating branches while ensuring timely collection of high-concentration odor gases generated during hydrolysis and depressurization, as well as low-concentration waste gases generated during pretreatment, pressing, and drying. The check valve isolation component also reduces waste gas crossflow and high-temperature gas backflow between different branches, thereby improving the overall airtightness of the equipment, the stability of waste gas collection, and the intake stability of subsequent incineration and purification modules.

[0064] The equipment also includes a waste heat recovery module, which comprises a high-temperature heat exchanger, a low-temperature heat exchanger, and a flue gas bypass regulating branch. The flue gas inlet of the high-temperature heat exchanger is connected to the flue gas outlet of the high-temperature incineration purification module, serving as the primary receiver of the high-temperature flue gas discharged from the high-temperature incineration purification module. The heated side of the high-temperature heat exchanger is connected to the heating end of the continuous high-temperature and high-pressure hydrolysis module via a hydrolysis heating circuit, enabling indirect heat exchange between the high-temperature flue gas and the hydrolysis heating medium. The hydrolysis heating medium can be steam, circulating hot water, or a heat transfer medium, which, after being heated by the high-temperature heat exchanger, is transported to the jacket, coils, or other heating components of the continuous high-temperature and high-pressure hydrolysis tank, thereby utilizing the high-grade heat in the flue gas for heating and insulation of the continuous high-temperature and high-pressure hydrolysis tank.

[0065] The low-temperature heat exchanger is connected downstream of the high-temperature heat exchanger, with its flue gas inlet connected to the flue gas outlet of the high-temperature heat exchanger, and its heated side connected to the hot air inlet of the drum dryer in the drying, pulverizing, and screening module. Specifically, the heated side of the low-temperature heat exchanger has an air inlet and a hot air outlet. After entering the low-temperature heat exchanger, external air indirectly exchanges heat with the flue gas that has been preliminarily cooled by the high-temperature heat exchanger. The resulting hot air is then transported to the drum dryer via hot air pipelines. Thus, the high-temperature flue gas first supplies heat to the hydrolysis process, which requires a higher temperature, and then uses the remaining heat after heat exchange to heat the drying air, allowing the heat from the flue gas to be utilized in stages according to the different temperature requirements of the hydrolysis and drying processes.

[0066] A flue gas bypass regulating branch connects the high-temperature heat exchanger and the low-temperature heat exchanger. This branch is equipped with a bypass regulating valve, one end of which connects to the flue gas outlet of the high-temperature heat exchanger, and the other end connects downstream of the flue gas outlet of the low-temperature heat exchanger. When the rotary drum dryer requires heating, the opening of the bypass regulating valve is reduced, allowing the flue gas passing through the high-temperature heat exchanger to enter the low-temperature heat exchanger. When the rotary drum dryer stops operating or its hot air temperature reaches a preset value, the opening of the bypass regulating valve is increased, allowing at least some flue gas to bypass the low-temperature heat exchanger, preventing excessively high inlet air temperatures for both the low-temperature heat exchanger and the rotary drum dryer. Furthermore, temperature sensors and flow regulating valves are installed in the hydrolysis heating circuit of the high-temperature heat exchanger and the hot air duct of the low-temperature heat exchanger, respectively, to adjust the heat exchange capacity according to the actual heating requirements of the continuous high-temperature, high-pressure hydrolysis tank and the rotary drum dryer.

[0067] In some embodiments, the waste heat recovery module further includes a condensate collection unit and a preheating water tank. When the continuous high-temperature and high-pressure hydrolysis module uses steam for heating, the steam at its heating end releases heat in the jacket or heat exchange coil of the continuous high-temperature and high-pressure hydrolysis tank, forming condensate. The condensate outlet at the heating end is connected to the condensate collection unit via a condensate recovery pipe, and the condensate collection unit is then connected to the preheating water tank. The preheating water tank is connected to the water inlet of the continuous high-temperature and high-pressure hydrolysis module, allowing the condensate with residual heat to enter the preheating water tank and be used directly as hydrolysis makeup water, or exchange heat with other makeup water before being transported to the continuous high-temperature and high-pressure hydrolysis tank. Additionally, a steam trap is installed on the condensate recovery pipe to discharge condensate and prevent steam from directly entering the preheating water tank.

[0068] With the above setup, the high-temperature heat exchanger first recovers high-grade heat from the flue gas and supplies it to the continuous high-temperature, high-pressure hydrolysis module. The low-temperature heat exchanger further recovers the remaining heat and provides hot air to the drum dryer. Simultaneously, the flue gas bypass regulating branch adapts to the heat load changes at different operating stages of the hydrolysis and drying processes. The condensate collection unit and preheating tank can recover the condensate and residual heat generated during the hydrolysis heating process. This reduces the external energy required for hydrolysis heating, material drying, and preheating for hydrolysis water replenishment, and lowers the heat load caused by high-temperature flue gas directly entering subsequent flue gas purification equipment.

[0069] In addition, in this embodiment, the complete set of equipment is centrally controlled by a PLC control system. The PLC is electrically connected to each weighing feeder, drive unit, conveying equipment, temperature sensor, pressure sensor, and branch regulating valve to collect the operating parameters of each module and control the quantitative feeding, confluence conveying, hydrolysis, pressure relief, pressing, phase separation, drying, and waste gas treatment processes of raw materials and aggregates according to a preset program. When the detected parameters exceed the preset range, the PLC controls the corresponding equipment to adjust its operating status or shut down and alarm, thereby improving the continuity and safety of the entire set of equipment operation. Furthermore, the PLC is also electrically connected to the low-temperature vacuum thickener unit, anaerobic digester, reuse branch control valve, thickening branch control valve, and biogas flow regulating valve to coordinate the water phase reuse, low-temperature thickening, residue return, and biogas combustion processes.

[0070] When using the above-mentioned complete set of equipment to treat livestock and poultry waste, the hair and bones are first fed into the corresponding pretreatment branches, and the hair and bone ratio is controlled by two weighing feeders according to the cumulative feeding amount. After the material is mixed, it enters the buffer pressure relief tank after closed feeding, continuous high temperature and high pressure hydrolysis and closed discharge, and then is quantitatively pressed by screw pressing. The solid phase and recovered filter residue obtained by pressing are mixed, dried, crushed and screened and then packaged. The pressing liquid is recovered as filter residue, oil phase and water phase after pre-filtering and oil-water sedimentation. The water phase is selected to be reused for hydrolysis or sent to the low temperature vacuum thickener unit according to the actual state. The concentrated residue is returned to the solid phase treatment path. The biogas generated by the anaerobic fermentation of the concentrated wastewater is used for combustion in the high temperature incineration purification module. The waste gas of each process is collected by negative pressure in the zone and then centrally incinerated for purification. The heat of the incineration flue gas is reused in stages.

[0071] In a preferred embodiment, the equipment is configured to process approximately 1 ton of raw material, aggregate, and attached soft tissue mixture per day, and operates in a 24-hour automatic batch cycle. The feed rate for each hydrolysis batch is 350-400 kg. The continuous high-temperature, high-pressure hydrolysis tank is maintained at approximately 150°C and 0.4 MPa for 2.5-3 hours. After hydrolysis, the material first enters a buffer pressure relief tank to reduce pressure, and then is fed into the screw press by a quantitative discharge device to minimize the instantaneous impact of batch discharge on the pressing equipment. The above values ​​are exemplary operating parameters and can be adjusted within the range defined in the claims according to the raw material moisture content, aggregate ratio, and equipment load.

[0072] The solid phase obtained from pressing, the pre-filter residue, and the concentrated residue are mixed in a mixing silo and then fed into a drum dryer to dry to a moisture content of no more than 10%. The dried material is then pulverized by a hammer mill and sieved through a 40-80 mesh screen. Qualified material is quantitatively packaged by the finished product packaging module. In the above operating example, approximately 300-400 kg of solid protein material can be obtained per day. After the product meets the relevant feed hygiene, safety, and product standards, it can be used as a protein feed ingredient.

[0073] After the press liquor obtained from the screw press is filtered and settled (including oil and water), the upper oil phase enters the oil collection tank. In the above operating example, the daily recovery of crude oil can be approximately 80-120 kg. The lower aqueous phase can be concentrated to a solids content of not less than 40% under low-temperature vacuum conditions of approximately 60°C. The resulting liquid protein concentrate, after testing or further processing to meet the corresponding requirements, can be used as a raw material for liquid protein feed. The concentrated residue is returned to the solid phase drying path, and the concentrated wastewater enters the anaerobic digester. The biogas produced is dehydrated and flame-retarded before being sent to a high-temperature incinerator for auxiliary combustion.

[0074] The high-temperature incinerator can operate within the temperature range of 800-1100℃. The zoned negative pressure gas collection module centrally transports the waste gas generated from pretreatment, hydrolysis, depressurization, pressing, drying, crushing, and sieving processes to the high-temperature incinerator. The incinerated flue gas is then treated by heat exchangers and flue gas purification devices before being discharged. The high-temperature heat exchanger prioritizes heating the hydrolysis heating circuit, while the low-temperature heat exchanger utilizes residual heat to provide hot air to the drum dryer. The condensate generated from hydrolysis heating is collected and used for hydrolysis makeup water or makeup water preheating. The high-temperature incinerator can be a direct-fired thermal oxidizer, a regenerative thermal oxidizer, or an incinerator with a secondary combustion chamber, which effectively reduces the processing pressure on subsequent flue gas purification devices compared to boiler combustion. This embodiment preferably uses a regenerative thermal oxidizer to perform high-temperature purification treatment on the waste gas collected by the zoned negative pressure gas collection module. The regenerative thermal oxidizer is suitable for treating continuously collected odorous and organic waste gases whose flow rate and concentration may fluctuate. It can achieve stable purification through high-temperature oxidation. At the same time, it can recover the waste heat in the purified high-temperature flue gas by using heat storage and heat exchange, and use the recovered waste heat to preheat the waste gas to be treated. This reduces auxiliary fuel consumption while ensuring the waste gas purification effect, and facilitates connection with subsequent flue gas purification devices.

[0075] In terms of industrial applications, addressing the issues of large land area and investment required for centralized high-capacity production lines, making them unsuitable for small and medium-sized sites, this equipment can adopt standardized modular combinations and distributed layouts to serve small and medium-sized farms, slaughtering and processing points, village and township cooperatives, or county-level processing stations. Each module employs closed-loop conveying and interlocking control. Zoned negative pressure gas collection modules centrally collect hydrolysis tail gas, depressurized gas, and drying tail gas to reduce load fluctuations and odor diffusion during small-scale intermittent operation. After pretreatment, hydrolysis, pressing, phase separation, concentration, and drying, livestock and poultry hair, bones, and attached soft tissues are processed to form solid protein materials, liquid protein concentrates, and recovered oils. This creates pathways for water phase reuse, biogas combustion, and waste heat cascade utilization, which can be used for non-grain protein raw material supply, animal-derived material conversion in biomanufacturing, and recycling equipment applications.

[0076] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of this application. All equivalent changes made based on the structure, steps and principles disclosed in this application should be covered within the scope of protection of this application.

Claims

1. A complete set of equipment for the miniaturized resource-based treatment of livestock and poultry waste, characterized in that: It includes a dual-path pretreatment module, a quantitative flow combining module, a continuous high-temperature and high-pressure hydrolysis module, a screw pressing module, a three-stage phase separation module, a drying, pulverizing and screening module, a finished product packaging module, and a high-temperature incineration purification module for treating the waste gas from each module; The dual-path pretreatment module includes a wool pretreatment branch and a bone pretreatment branch. The wool pretreatment branch and the bone pretreatment branch are respectively connected to the quantitative flow module through weighing feeders. The two weighing feeders control the start and stop of the two branches based on the cumulative feed amount, so that the wool and aggregate in each hydrolysis batch maintain a preset mass ratio. The quantitative flow module is connected in sequence to the continuous high temperature and high pressure hydrolysis module and the screw press module. The spiral pressing module has a solid phase outlet and a pressing liquid outlet. The solid phase outlet is sequentially connected to the drying, pulverizing, and screening module and the finished product packaging module. The pressing liquid outlet is connected to the three-stage phase diversion module. The three-stage phase diversion module includes a pre-filter, an oil-water settling tank, an oil collection tank, and an aqueous phase buffer tank, forming a filter residue recovery branch, an oil phase collection branch, and an aqueous phase collection branch, respectively. The pressing liquid outlet is sequentially connected to the pre-filter and the oil-water settling tank. The filter residue outlet of the pre-filter is connected to the solid phase outlet through the filter residue recovery branch. The oil-water settling tank is connected to the oil collection tank through the oil phase collection branch. The oil-water settling tank is connected to the aqueous phase buffer tank through the aqueous phase collection branch.

2. The complete set of equipment for miniaturized resource-based treatment of livestock and poultry waste according to claim 1, characterized in that: The wool pretreatment branch includes a closed-loop washing hopper, a loose conveying assembly, and a wool impurity removal screen connected in sequence. The closed-loop washing hopper is used to receive, remove iron from, and wash the wool. The aggregate pretreatment branch includes a closed-loop washing aggregate hopper, an aggregate crusher, and an aggregate impurity removal screen connected in sequence. The closed-loop washing aggregate hopper is used to receive, remove iron from, and wash the aggregate. The wool and the aggregate are respectively conveyed to the quantitative flow confluence module by the weighing feeder.

3. The complete set of equipment for miniaturized resource-based treatment of livestock and poultry waste according to claim 1, characterized in that: The quantitative flow mixing module includes a quantitative flow mixing chamber, a low-speed mixer, and a closed screw conveyor; the discharge ends of the two weighing feeders are respectively connected to the quantitative flow mixing chamber, and the quantitative flow mixing chamber is connected to the continuous high-temperature and high-pressure hydrolysis module through the closed screw conveyor.

4. The complete set of equipment for miniaturized resource-based treatment of livestock and poultry waste according to claim 1, characterized in that: The continuous high-temperature and high-pressure hydrolysis module includes a continuous high-temperature and high-pressure hydrolysis tank and a stirring assembly, a heating assembly, a temperature sensor, a pressure sensor, and a pressure relief valve installed in the continuous high-temperature and high-pressure hydrolysis tank. The feed inlet of the continuous high-temperature and high-pressure hydrolysis tank is connected to an automatic feeding sealing screw and a pressure-resistant isolation assembly at the feed end, and the discharge outlet of the continuous high-temperature and high-pressure hydrolysis tank is connected to an automatic discharge sealing screw and a pressure-resistant isolation assembly at the discharge end, so that the continuous high-temperature and high-pressure hydrolysis tank maintains a preset hydrolysis temperature and pressure during feeding and discharging.

5. A complete set of equipment for miniaturized resource-based treatment of livestock and poultry waste according to claim 4, characterized in that: It also includes a low-temperature vacuum thickener unit, a residue return conveyor, an anaerobic digester, a biogas transmission pipeline, and a water phase reuse branch. The outlet of the water phase buffer tank is connected to the inlet of the low-temperature vacuum thickener unit and the water phase reuse branch. The low-temperature vacuum thickener unit has a liquid protein concentrate outlet, a concentrated residue outlet, and a concentrated wastewater outlet. The concentrated residue outlet is connected to the drying, pulverizing, and screening module via the residue return conveyor. The inlet of the anaerobic digester is connected to the concentrated wastewater outlet. The anaerobic digester... The biogas outlet of the tank is connected to the fuel inlet of the high-temperature incineration purification module through the biogas delivery pipeline; the aqueous phase reuse branch is connected to the water inlet of the continuous high-temperature and high-pressure hydrolysis tank and is equipped with a filter, a reuse pump and a reuse valve; the drying, crushing and screening module includes a mixing bin, a drum dryer, a hammer mill and a screening machine connected in sequence, the qualified material outlet of the screening machine is connected to the finished product packaging module, and the coarse material outlet of the screening machine is connected to the feed inlet of the hammer mill or the mixing bin through a closed return conveyor.

6. The complete set of equipment for miniaturized resource-based treatment of livestock and poultry waste according to claim 1, characterized in that: It also includes a buffer pressure relief and discharge module connected between the continuous high-temperature and high-pressure hydrolysis module and the screw pressing module. The buffer pressure relief and discharge module includes a buffer pressure relief tank and a pressure detection port, a gas phase outlet, and a bottom material outlet located in the buffer pressure relief tank. The bottom material outlet is connected to the screw pressing module through a quantitative discharge device. It also includes a zoned negative pressure gas collection module. The zoned negative pressure gas collection module includes an induced draft fan, a negative pressure gas collection main pipe, and gas collection branch pipes. Each of the gas collection branch pipes is connected to the negative pressure gas collection main pipe through a check isolation component and a branch regulating valve. The wool pretreatment branch, the bone pretreatment branch, the continuous high-temperature and high-pressure hydrolysis module, the buffer pressure relief and discharge module, the screw pressing module, and the drying, pulverizing, and screening module are respectively connected to the negative pressure gas collection main pipe through the gas collection branch pipes. Each of the gas collection branch pipes is equipped with a pressure sensor. The negative pressure gas collection main pipe, the high-temperature incineration purification module, and the induced draft fan are connected in sequence.

7. The complete set of equipment for miniaturized resource-based treatment of livestock and poultry waste according to claim 1, characterized in that: It also includes a waste heat grading and recovery module, which comprises a high-temperature heat exchanger, a low-temperature heat exchanger, a flue gas bypass regulating branch, a condensate collection unit, and a preheating water tank. The high-temperature heat exchanger is connected to the flue gas outlet of the high-temperature incineration purification module, and the heated side of the high-temperature heat exchanger is connected to the heating end of the continuous high-temperature and high-pressure hydrolysis module. The low-temperature heat exchanger is connected downstream of the flue gas from the high-temperature heat exchanger, and the heated side of the low-temperature heat exchanger is connected to the hot air inlet of the drying, pulverizing, and screening module. The flue gas bypass regulating branch is connected between the high-temperature heat exchanger and the low-temperature heat exchanger. The heating end of the continuous high-temperature and high-pressure hydrolysis module has a condensate outlet, which is connected to the preheating water tank through the condensate collection unit. The preheating water tank is connected to the water inlet of the continuous high-temperature and high-pressure hydrolysis module.

8. A method for miniaturized resource-based treatment of livestock and poultry waste, characterized in that, Includes the following steps: Step S1: Classify livestock and poultry waste into hair and bone. Send the hair to the hair pretreatment branch for receiving, iron removal, washing, loosening and screening of impurities. Send the bone to the bone pretreatment branch for receiving, iron removal, washing, crushing and screening of impurities. Step S2: The pre-treated raw material and aggregate are weighed by two weighing feeders respectively, and the start and stop of the two weighing feeders are controlled based on the cumulative feeding amount, so that the raw material and aggregate are mixed and conveyed in a closed manner into the quantitative flow module according to the preset mass ratio. Step S3: The converging material is fed into a continuous high temperature and high pressure hydrolysis tank through an automatic feeding sealed screw and a pressure-resistant isolation component at the feeding end. The material is hydrolyzed by heating and stirring. The hydrolyzed material is discharged through an automatic discharging sealed screw and a pressure-resistant isolation component at the discharging end, so that the continuous high temperature and high pressure hydrolysis tank maintains the preset hydrolysis temperature and pressure during feeding and discharging. Step S4: The discharged hydrolyzed material is sent to the buffer pressure relief discharge module for pressure release and discharge flow buffering, and then quantitatively fed into the screw press module to obtain solid phase and press liquid. Step S5: The solid phase is fed into the drying, pulverizing and screening module for drying, pulverizing and screening, and qualified materials are sent into the finished product packaging module; the pressing liquid is passed through the pre-filter residue and oil-water sedimentation in sequence to form filter residue, oil phase and water phase. The filter residue is returned to the solid phase treatment path, the oil phase is collected, and the water phase is sent to the water phase buffer tank for reuse, concentration or wastewater treatment.

9. A method for miniaturized resource-based treatment of livestock and poultry waste according to claim 8, characterized in that: Based on the water replenishment requirements of the continuous high-temperature and high-pressure hydrolysis tank, the liquid level of the aqueous buffer tank, and the aqueous phase detection results, a portion of the aqueous phase that meets the reuse conditions is selectively filtered and reused in the continuous high-temperature and high-pressure hydrolysis tank. The remaining aqueous phase is sent to a low-temperature vacuum concentrator to obtain liquid protein concentrate, concentrated residue, and concentrated wastewater, respectively. The concentrated residue is returned to the solid phase treatment path, and the concentrated wastewater is sent to an anaerobic digester for anaerobic fermentation. The biogas produced is dehydrated and flame-retarded before being sent to a high-temperature incineration purification module as auxiliary fuel.

10. A method for miniaturized resource utilization of livestock and poultry waste according to claim 8, characterized in that: The waste gas generated by the wool pretreatment branch, bone pretreatment branch, continuous high-temperature and high-pressure hydrolysis module, buffer pressure relief discharge module, screw pressing module, and drying, pulverizing, and screening module is collected by the partitioned negative pressure gas collection module. The gas extraction volume of each branch is adjusted according to the pressure of each branch and the operating status of the corresponding module, and the collected waste gas is sent to the high-temperature incineration purification module. The flue gas discharged from the high-temperature incineration purification module is sequentially sent to the high-temperature heat exchanger and the low-temperature heat exchanger. The heat recovered by the high-temperature heat exchanger is used to heat the continuous high-temperature and high-pressure hydrolysis module, and the heat recovered by the low-temperature heat exchanger is used to provide hot air to the drying, pulverizing, and screening module. The condensate generated by the hydrolysis heating is collected and used for hydrolysis water replenishment or water replenishment preheating.

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