Livestock and poultry manure drying treatment mechanism

Abstract

The invention relates to the technical field of poultry manure treatment equipment, and discloses a poultry manure drying treatment mechanism which comprises a preheating furnace and a drying furnace, stirring assemblies are arranged in inner cavities of the preheating furnace and the drying furnace, and an interlayer is arranged on the outer wall of the preheating furnace; an inner cavity of the drying furnace is communicated with the interlayer, a cyclone dust collector is arranged between the inner cavity of the drying furnace and the interlayer, one end of an air inlet of the cyclone dust collector is communicated with the inner cavity of the drying furnace, and one end of an air outlet of the cyclone dust collector is communicated with an air inlet of the interlayer. According to the livestock and poultry manure drying treatment mechanism, efficient dehydration is achieved, fluid livestock and poultry manure can be continuously and evenly smeared to the inner wall of the drying furnace and smeared and scraped by arranging a unique stirring assembly in the drying furnace, especially an obliquely-arranged smearing plate, the contact area between the livestock and poultry manure and hot air is greatly increased, the water evaporation speed is increased, and the drying efficiency is improved. And compared with a traditional treatment mode, the dehydration efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of poultry manure treatment equipment, and particularly to a drying treatment mechanism for livestock and poultry manure. Background Art

[0002] With the large-scale and intensive development of the livestock and poultry breeding industry, the generation amount of livestock and poultry manure is increasing day by day. If the livestock and poultry manure is not properly treated, it will not only cause serious pollution to the surrounding environment, such as emitting foul odors and breeding a large number of germs, but also may lead to a series of ecological problems such as water eutrophication and soil pollution. Therefore, how to efficiently and environmentally treat livestock and poultry manure has become an important issue that needs to be solved urgently at present.

[0003] At present, the common treatment methods for livestock and poultry manure mainly include direct field application, composting treatment, and simple drying treatment, etc. Although direct field application can provide nutrients for the soil to a certain extent, the livestock and poultry manure without sufficient treatment may carry a large number of pathogenic bacteria, parasite eggs, and weed seeds, etc., which are likely to cause harm to crops and the soil ecosystem. Although composting treatment can make the livestock and poultry manure decompose under the action of microorganisms and become organic fertilizers, this process takes a long time, occupies a large area, and the odor generated during the treatment process is difficult to effectively control, still having a certain impact on the surrounding environment. Simple drying treatment usually only dehydrates the livestock and poultry manure preliminarily, and the quality of the products made is uneven, with a limited application range, and the energy consumption is often high and the cost is large during the drying process.

[0004] In addition, there are many deficiencies in the design and function of some existing livestock and poultry manure treatment devices. For example, the livestock and poultry manure is unevenly heated during the drying process, the dehydration efficiency is low, and it is difficult to quickly and thoroughly remove moisture. At the same time, in terms of heat utilization, most devices do not fully consider the recycling of energy, resulting in waste of energy. In the exhaust gas treatment link, the steam containing odors, harmful gases, and livestock and poultry manure dust generated during the drying process is not effectively treated, and the direct emission pollutes the atmospheric environment.

[0005] In summary, it has important practical significance to develop a treatment device that can efficiently dehydrate, make full use of energy, reduce environmental pollution, and can make high-quality products from livestock and poultry manure. The present invention aims to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a drying treatment mechanism for livestock and poultry manure to solve the problems put forward in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A livestock and poultry manure drying treatment mechanism includes a preheating furnace and a drying furnace. Stirring components are arranged in the inner cavities of both the preheating furnace and the drying furnace. The preheating furnace is communicated with the drying furnace through a material conveying pipeline. A sandwich layer is provided on the outer wall of the preheating furnace. The inner cavity of the drying furnace is communicated with the sandwich layer, and a cyclone dust collector is arranged between the inner cavity of the drying furnace and the sandwich layer. One end of the air inlet of the cyclone dust collector is communicated with the inner cavity of the drying furnace, and one end of the air outlet of the cyclone dust collector is communicated with the air inlet of the sandwich layer. One end of the air outlet of the sandwich layer is connected with a heat exchanger. The hot air outlet of the heat exchanger is communicated with the inner cavity of the preheating furnace, and the cold air outlet of the heat exchanger is communicated with a dust removal spray tower. A combustion furnace is arranged at one end of the drying furnace.

[0009] Preferably, the hot air outlet of the heat exchanger is also communicated with the inner cavity of the preheating furnace through a third pipeline, and the inner cavity of the preheating furnace is communicated with the dust removal spray tower through a second pipeline.

[0010] Preferably, a raw material inlet is opened on the outer wall of the preheating furnace, a raw material tank is arranged near the raw material inlet, and the raw material tank is connected with the raw material inlet through a feeding conveyor belt.

[0011] Preferably, heat insulation layers are arranged on the outer walls of both the preheating furnace and the drying furnace.

[0012] Preferably, a constant temperature storage box is arranged at the discharging place of the drying furnace.

[0013] A stirring mechanism for drying livestock and poultry manure includes a drying furnace with a cylindrical inner wall. A stirring member is arranged at the center of the drying furnace. The stirring member includes a roller shaft, and stirring blades are evenly distributed on the outer wall of the roller shaft. A trowel plate is fixedly connected to the free end of each stirring blade, and a gap is left between the trowel plate and the inner wall of the drying furnace.

[0014] Preferably, the free end of the trowel plate is set in a toothed shape.

[0015] Preferably, the trowel plate is inclined at a certain angle with respect to both the longitudinal and transverse planes of the stirring blade.

[0016] Preferably, blocking wind plates are arranged on the outer wall of the roller shaft between the stirring blades.

[0017] A method for drying livestock and poultry manure and utilizing waste heat

[0018] S1. Make livestock and poultry manure into a fluid state, introduce it into the preheating furnace, and drive the stirring component inside the preheating furnace to work.

[0019] S2. Ignite the combustion furnace to heat the inside of the drying furnace, control the cyclone dust collector to work, and introduce the hot air in the inner cavity of the drying furnace into the inner side of the sandwich layer of the preheating furnace to heat the preheating furnace.

[0020] S3. The preheating furnace introduces the preheated material into the drying furnace. A large amount of steam is generated as the material is heated. After being dust-removed by a cyclone dust collector, it is introduced into the interlayer to continuously heat the preheating furnace.

[0021] S4. Then, a heat exchanger is used to collect the gas discharged from the interlayer for waste heat recovery and then reuse.

[0022] S5. The cooled gas discharged from the interlayer and the gas discharged from the preheating furnace are introduced into a dust removal spray tower for dust removal treatment.

[0023] S6. The dried material, if used as fertilizer, is introduced into the inner side of a constant temperature storage box for sterilization; if used as fuel, it is directly exported and sent to a granulator for granulation.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] This livestock and poultry manure drying treatment mechanism

[0026] Energy recycling: On the one hand, the spray furnace uses the dried and formed livestock and poultry manure as fuel, achieving self-sufficiency in its own energy, reducing dependence on external energy, and lowering the treatment cost; on the other hand, the steam generated by the drying furnace is introduced into the interlayer of the preheating furnace after dust removal to heat the preheating furnace, saving the preheating cost. Then, the waste heat of the gas discharged from the interlayer is reused by a heat exchanger, realizing the recycling of energy and improving the energy utilization rate.

[0027] Good environmental protection: The device is equipped with a cyclone dust collector and a spray tower. The cyclone dust collector can effectively separate the dust in the cooled material; the dust removal spray tower treats the livestock and poultry manure dust contained in the steam and then discharges it, significantly reducing the pollution to the atmospheric environment and meeting the environmental protection requirements.

[0028] Efficient dehydration: By setting a unique stirring component in the drying furnace, especially the inclined trowel plate, the fluid livestock and poultry manure can be continuously and evenly smeared onto the inner wall of the drying furnace and scraped, greatly increasing the contact area between the livestock and poultry manure and hot air, accelerating the water evaporation speed, achieving rapid dehydration. Compared with the traditional treatment method, the dehydration efficiency is greatly improved.

[0029] High product quality: After drying, cooling, and dust removal, the material enters the granulator and is extruded into granular fuel. Compared with the products made by traditional treatment, the granular fuel is more burn-resistant, improving the product quality and application value of the treated livestock and poultry manure and expanding its application range. Description of the Drawings

[0030] Figure 1 It is a three-dimensional structure schematic diagram of a corner of the raw material inlet in a preferred embodiment of the present invention;

[0031] Figure 2 Schematic three-dimensional structure diagram of a corner of the discharge pipeline in a preferred embodiment of the present invention;

[0032] Figure 3 Schematic three-dimensional structure diagram of a corner of the fire inlet in a preferred embodiment of the present invention;

[0033] Figure 4 Schematic three-dimensional structure diagram of a corner of the dust removal spray tower in a preferred embodiment of the present invention;

[0034] Figure 5 Schematic sectional structure diagram of the preheating furnace in a preferred embodiment of the present invention;

[0035] Figure 6 Schematic three-dimensional structure diagram of the stirring assembly in a preferred embodiment of the present invention;

[0036] Figure 7 Schematic side structure diagram of the stirring assembly in a preferred embodiment of the present invention;

[0037] Figure 8 Schematic sectional structure diagram of the stirring assembly in a preferred embodiment of the present invention.

[0038] In the figure: 1, preheating furnace; 2, drying furnace; 3, constant temperature storage box; 4, dust removal spray tower; 5, stirring assembly, 51, roller shaft, 52, stirring blade, 53, trowel plate, 54, wind blocking plate; 6, discharge pipeline; 7, cyclone dust collector; 8, raw material inlet, 81, raw material tank, 82, feeding conveyor belt; 9, first pipeline; 10, second pipeline; 11, third pipeline; 12, fourth pipeline; 13, fifth pipeline; 14, heat exchanger; 15, sixth pipeline; 16, combustion furnace; 17, preheated material inlet; 18, material conveying pipeline; 19, fire inlet; 20, fan; 21, interlayer. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0040] Please refer to Figure 1-8 , the present invention provides a technical solution:

[0041] A livestock and poultry manure drying treatment mechanism, including a preheating furnace 1 and a drying furnace 2. The preheating furnace 1 is used to preheat the materials and then introduce them into the drying furnace 2 for drying operations. Stirring components 5 for stirring the materials and pushing the materials forward are arranged in the inner cavities of both the preheating furnace 1 and the drying furnace 2, and the stirring components 5 are connected to drive motors.

[0042] One end of the outer wall of the preheating furnace 1 is provided with a raw material inlet 8. The raw material inlet 8 is provided with a hopper at the top and a screw conveyor at the bottom of the hopper. A raw material tank 81 is arranged near the raw material inlet 8, and the raw material tank 81 is connected to the raw material inlet 8 through a feeding conveyor belt 82.

[0043] The preheating furnace 1 is communicated with the preheated inlet 17 of the drying furnace 2 through a material conveying pipeline 18. A raw material outlet is arranged at one end of the bottom of the outer wall of the preheating furnace 1 far from the raw material inlet 8, and a material conveying pipeline 18 is arranged at the raw material outlet. The material conveying pipeline 18 uses a screw conveyor.

[0044] The outer wall of the preheating furnace 1 is provided with a sandwich layer 21. A serpentine plate is arranged inside the sandwich layer 21 and abuts against the inner wall of the sandwich layer 21 to form a spiral partition, so that an air duct rotating around the outer wall of the preheating furnace 1 is formed inside the sandwich layer 21. One end of the air outlet of the inner cavity of the drying furnace 2 is communicated with one end of the air inlet of the sandwich layer 21, that is, the hot air discharged from the drying furnace 2 is used as the heat source for preheating the materials in the preheating furnace 1.

[0045] A cyclone dust collector 7 is arranged between the inner cavity of the drying furnace 2 and the sandwich layer 21. One end of the air inlet of the cyclone dust collector 7 is communicated with the inner cavity of the drying furnace 2 through a sixth pipeline 15, and one end of the air outlet of the cyclone dust collector 7 is communicated with the air inlet of the sandwich layer 21 through a first pipeline 9. A cyclone dust collector 7 is arranged on the connection between the first pipeline 9 and the sixth pipeline 15, because when the materials are dried inside the drying furnace 2, the evaporated moisture and the dust raised by stirring will be mixed in the discharged hot air. The cyclone dust collector 7 recovers the dust in the hot air to avoid a large amount of dust entering the sandwich layer 21 and causing deposition and blockage.

[0046] One end of the air outlet of the sandwich layer 21 is connected with a heat exchanger 14 through a fourth pipeline 12. The heat exchanger 14 is used to recover the gas discharged from the sandwich layer 21. The hot air outlet of the heat exchanger 14 is communicated with the inner cavity of the preheating furnace 1. Two groups of heat exchangers 14 are connected in series, and a fan 20 is controlled to drive the gas flow inside the heat exchanger 14. After recovering the heat, the heat source is led back into the inner cavity of the preheating furnace 1. The cold air outlet of the heat exchanger 14 is communicated with a dust removal spray tower 4. And the heat exchanger 14 is communicated with the dust removal spray tower 4 through a fifth pipeline 13. The dust removal spray tower 4 is used to spray and dust-remove the steam generated by drying the materials, so as to facilitate emission.

[0047] One end of the drying furnace 2 is provided with a combustion furnace 16. An air inlet 19 is opened at one end of the drying furnace 2. The combustion furnace 16 sprays open fire and enters the inner cavity of the drying furnace 2 through the air inlet 19. There is a certain gap between the flame spraying port of the combustion furnace 16 and the air inlet 19 to allow air to enter the air inlet 19. It is best to use a biological combustion furnace for the combustion furnace 16 because the dried feces after extrusion granulation can be used as fuel for the combustion furnace 16 to form a cycle.

[0048] A heat insulation layer is provided on the outer walls of both the drying furnace 2 and the preheating furnace 1 to reduce heat transfer to the outside. A discharge pipeline 6 is provided at one end of the bottom of the drying furnace 2 away from the air inlet 19. The discharge pipeline 6 can use the same screw conveyor as the material conveying pipeline 18.

[0049] The output end of the discharge pipeline 6 is connected to a constant temperature storage tank 3 or an extrusion granulator. Sterilization can be carried out on the dried feces powder in the constant temperature storage tank 3 to improve the sterilization effect.

[0050] The hot air outlet of the heat exchanger 14 is also communicated with the inner cavity of the preheating furnace 1 through a third pipeline 11. The hot air enters the inner cavity of the preheating furnace 1 to directly heat the raw materials. The inner cavity of the preheating furnace 1 is communicated with the dust removal spray tower 4 through a second pipeline 10.

[0051] A stirring mechanism for drying livestock and poultry feces includes a drying furnace 2 with a cylindrical inner wall. A stirring member 5 is provided at the center of the drying furnace 2. The stirring member 5 includes a roller shaft 51. Stirring blades 52 are evenly distributed on the outer wall of the roller shaft 51. A trowel plate 53 is fixedly connected to the free end of each stirring blade 52. There is a gap between the trowel plate 53 and the inner wall of the drying furnace 2. The roller shaft 51 is driven to rotate by a driving motor. The roller shaft 51 drives the stirring blades 52 to rotate. The stirring blades 52 drive the trowel plate 53. The material is smeared on the inner wall of the drying furnace 2 through the trowel plate 53 to disperse the material and increase the drying effect. The trowel plate 53 rotates quickly and scrapes the material smeared on the inner wall of the drying furnace 2 while smearing.

[0052] The free end of the trowel plate 53 is set in a toothed shape so that the surface of the material smeared on the inner wall of the drying furnace 2 is corrugated, which is used to increase the contact area between the material and the hot air. At the same time, the trowel plate 53 scrapes off the surface-dried material, and the material falls in powder form.

[0053] The trowel plate 53 is inclined at a certain angle in both the longitudinal and transverse planes of the stirring blade 52. Setting the transverse plane of the trowel plate 53 and the stirring blade 52 at a certain inclination angle is to facilitate smearing the material on the inner wall of the drying furnace 2. Setting the longitudinal plane of the trowel plate 53 and the stirring blade 52 at a certain inclination angle is to facilitate pushing the material forward.

[0054] A wind blocking plate 54 is arranged on the outer wall of the roller shaft 51 between the stirring blades 52. When the open fire sprayed by the combustion furnace 16 enters the inner cavity of the drying furnace 2 through the fire inlet 19, the gas will flow from one end of the fire inlet 19 to one end of the sixth pipeline 15; the wind blocking plate 54 arranged in the center of the drying furnace 2 blocks the gas, so that the hot gas flows close to the inner wall of the drying furnace 2, increasing the contact effect between the hot gas and the material.

[0055] A method for drying livestock and poultry manure and utilizing waste heat

[0056] S1. Make the livestock and poultry manure into a fluid state, then put the material into the raw material tank 81, and then drive the feeding conveyor belt 82 to work to introduce the raw material into the raw material inlet 8, and then into the preheating furnace 1. Drive the stirring assembly inside the preheating furnace 1 to work to push the material forward;

[0057] S2. Ignite the combustion furnace 16 to heat the inside of the drying furnace 2, control the cyclone dust collector 7 to work, and introduce the hot air in the inner cavity of the drying furnace 2 into the inner side of the sandwich layer 21 of the preheating furnace 1 to heat the preheating furnace 1;

[0058] S3. The preheating furnace 1 introduces the preheated material into the drying furnace 2. In the preheating furnace 1 and the drying furnace 2, the roller shaft 51 is driven to rotate by the driving motor, the roller shaft 51 drives the stirring blade 52 to rotate, and the stirring blade 52 drives the trowel plate 53. The material is smeared on the inner wall of the drying furnace 2 through the trowel plate 53, and the material is dispersed to increase the drying effect. The trowel plate 53 rotates rapidly, smearing and scraping the material smeared on the inner wall of the drying furnace 2 while smearing. A large amount of steam is generated after the material in the drying furnace 2 is heated, and after passing through the cyclone dust collector 7 for dust removal, it is introduced into the sandwich layer 21 to continuously heat the preheating furnace 1. A large amount of dust will be filtered out when the steam passes through the cyclone dust collector 7;

[0059] S4. Then use the heat exchanger 14 to collect the gas discharged from the sandwich layer 21 for waste heat recovery, and then reuse it. The waste heat is introduced into the inner cavity of the preheating furnace 1 through the third pipeline 11;

[0060] S5. Introduce the cooled gas discharged from the sandwich layer 21 and the gas discharged from the preheating furnace 1 into the dust removal spray tower 4 for dust removal treatment;

[0061] S6. The dried material is introduced into the inner side of the constant temperature storage box 3 for sterilization if it is used as fertilizer; if it is used as fuel, it is directly exported and sent to the granulator for granulation.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0063] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" may explicitly or implicitly include at least one of such features.

[0064] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A livestock and poultry manure drying treatment mechanism, comprising a preheating furnace (1) and a drying furnace (2). Stirring components (5) are arranged in the inner cavities of both the preheating furnace (1) and the drying furnace (2). The preheating furnace (1) is communicated with the drying furnace (2) through a material conveying pipeline (18), and is characterized in that: The outer wall of the preheating furnace (1) is provided with a sandwich layer (21); the inner cavity of the drying furnace (2) is communicated with the sandwich layer (21), and a cyclone dust collector (7) is arranged between the inner cavity of the drying furnace (2) and the sandwich layer (21). One end of the air inlet of the cyclone dust collector (7) is communicated with the inner cavity of the drying furnace (2), and one end of the air outlet of the cyclone dust collector (7) is communicated with the air inlet of the sandwich layer (21); one end of the air outlet of the sandwich layer (21) is connected with a heat exchanger (14), the hot air outlet of the heat exchanger (14) is communicated with the inner cavity of the preheating furnace (1), the cold air outlet of the heat exchanger (14) is communicated with a dust removal spray tower (4), and a combustion furnace (16) is arranged at one end of the drying furnace (2).

2. The livestock and poultry manure drying and treatment mechanism according to claim 1, characterized in that: The hot air outlet of the heat exchanger (14) is also communicated with the inner cavity of the preheating furnace (1) through a third pipeline (11), and the inner cavity of the preheating furnace (1) is communicated with the dust removal spray tower (4) through a second pipeline (10).

3. A livestock and poultry manure drying treatment mechanism according to claim 1, characterized in that: A raw material inlet (8) is arranged on the outer wall of the preheating furnace (1), a raw material tank (81) is arranged near the raw material inlet (8), and the raw material tank (81) is connected with the raw material inlet (8) through a feeding conveyor belt (82).

4. The livestock and poultry manure drying treatment mechanism according to claim 1, wherein: Heat insulation layers are arranged on the outer walls of the preheating furnace (1) and the drying furnace (2).

5. A livestock and poultry manure drying treatment mechanism according to claim 1, characterized in that: A constant temperature storage box (3) is arranged at the discharging place of the drying furnace (2).

6. A stirring mechanism for drying livestock and poultry manure, characterized in that: It includes a drying furnace (2) with a cylindrical inner wall, and a stirring member (5) is arranged at the center of the drying furnace (2). The stirring member (5) includes a roller shaft (51), stirring blades (52) are uniformly distributed on the outer wall of the roller shaft (51), a trowel plate (53) is fixedly connected to the free end of each stirring blade (52), and a gap is left between the trowel plate (53) and the inner wall of the drying furnace (2).

7. An apparatus for drying livestock and poultry manure according to claim 6, characterized in that: The free end of the trowel plate (53) is arranged in a toothed shape.

8. An animal manure drying treatment mechanism according to claim 6, characterized in that: The trowel plate (53) is inclined at a certain angle with respect to both the longitudinal and transverse planes of the stirring blade (52).

9. The livestock and poultry manure drying treatment mechanism according to claim 6, characterized in that: Blocking air plates (54) are arranged on the outer wall of the roller shaft (51) between the stirring blades (52).

10. A method for drying livestock and poultry manure and utilizing waste heat, characterized in that: S1, making livestock and poultry manure into a fluid state, introducing it into the preheating furnace (1), and driving the stirring component inside the preheating furnace (1) to work; S2, igniting the combustion furnace (16) to heat the inside of the drying furnace (2), controlling the cyclone dust collector (7) to work, and introducing the hot air in the inner cavity of the drying furnace (2) into the inner side of the sandwich layer (21) of the preheating furnace (1) to heat the preheating furnace (1); S3, the preheating furnace (1) introduces the preheated material into the drying furnace (2), the material generates a large amount of steam after heating, and after being dust-removed by the cyclone dust collector (7), it is introduced into the sandwich layer (21) to continuously heat the preheating furnace (1); S4, then using the heat exchanger (14) to collect the gas discharged from the sandwich layer (21) for waste heat recovery and then reuse; S5, introducing the cooled gas discharged from the sandwich layer (21) and the gas discharged from the preheating furnace (1) into the dust removal spray tower (4) for dust removal treatment; S6. The dried material is introduced into the inner side of the constant-temperature storage tank (3) for sterilization if it is used as fertilizer, and is directly exported and sent to a granulator for granulation if it is used as fuel.

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