Livestock and poultry manure high-temperature activation furnace and control method thereof

Abstract

The invention provides a livestock and poultry manure high-temperature activation furnace and a control method thereof.The activation furnace comprises a vertical furnace body, the first section in a hearth of the vertical furnace body is provided with a feeding nozzle and a fuel nozzle from top to bottom, the second section is provided with a first combustion-supporting air nozzle, the third section is provided with a cooling liquid nozzle, and the fourth section is provided with a cold air nozzle; a reduction gasification area, a peroxidation combustion area, a primary cooling area and a secondary cooling area are sequentially defined in the hearth to control the temperature in a partitioned mode, and the feeding nozzles and the fuel nozzles are arranged in pairs and arranged around the center circle of the hearth in a symmetrical tangent circle opposite spraying mode. Hedging airflow is formed to generate turbulent flow disturbance in the center area of the hearth, a swirling flow field is established, and top combustion is formed. Therefore, the high-temperature activation treatment of the livestock and poultry excrement is realized.

Description

Technical Field

[0001] This invention relates to the field of high-temperature activation furnace technology, and in particular to a high-temperature activation furnace and its control method for high-temperature activation treatment of livestock and poultry manure. Background Technology

[0002] High-temperature activation technology is a technique that alters the physical structure, chemical properties, or composition of a target substance by treating it in a high-temperature environment. Its core principle is to utilize the energy provided by high temperatures to break the substance's original chemical bonds, promote molecular recombination, or remove impurities and create porous structures, thereby achieving the purpose of "activation." Today, high-temperature activation technology is widely used in various industries due to its ability to efficiently change the properties of materials.

[0003] Animal manure, as a major type of organic solid waste, contains essential nutrients such as phosphorus and potassium, which are necessary for plant growth and are high-quality fertilizer raw materials. However, improper treatment can easily pollute the environment and waste resources. To address this, existing technologies have proposed a wet acid leaching process to extract high-value elements from it.

[0004] For example, taking chicken manure as an example, the main ash phases in raw chicken manure are CaO and (Ca,Mg)CO3, indicating that phosphorus and potassium mainly exist in organic form. Therefore, only after chicken manure is activated at high temperature can the organic phosphorus in it be converted into inorganic phosphorus, thus having the activity of wet extraction, so as to combine with calcium to form calcium pyrophosphate (Ca2P2O7). Calcium pyrophosphate is more soluble in acidic solutions. Therefore, high-temperature activation treatment and ensuring its conversion rate are prerequisites for adapting to wet acid leaching processes and recovering high-value elements from such livestock and poultry manure.

[0005] However, in the existing technology, there is no high-temperature activation furnace specifically designed for the high-temperature activation treatment of livestock and poultry manure, so it is urgent for those skilled in the art to design and implement it. Summary of the Invention

[0006] Therefore, the main objective of this invention is to provide a high-temperature activation furnace for livestock and poultry manure and its control method, so as to achieve high-temperature activation treatment of livestock and poultry manure.

[0007] To achieve the above objectives, according to one aspect of the present invention, a high-temperature activation furnace for livestock and poultry manure is provided, comprising: a vertical furnace body, wherein a first section of the furnace chamber is provided with a feed nozzle and a fuel nozzle respectively, a second section is provided with a first combustion air nozzle, a third section is provided with a coolant nozzle, and a fourth section is provided with a cold air nozzle, so as to define a reduction gasification zone, an oxygen-over-combustion zone, a primary cooling zone, and a secondary cooling zone in sequence within the furnace chamber for zoned temperature control, wherein the feed nozzle and the fuel nozzle are respectively arranged in pairs, in a symmetrical tangential spray pattern around the center circle of the furnace chamber, so as to form a countercurrent airflow that generates turbulent disturbance in the central region of the furnace chamber to establish a swirling flow field and form top combustion.

[0008] In a possible preferred embodiment, the temperature of each zone in the furnace of the vertical furnace body is controlled according to the reaction temperature field as follows: reduction gasification zone 1250~1150℃, oxygen combustion zone 1100~1000℃, primary cooling zone 950~850℃, and secondary cooling zone 700~600℃.

[0009] In a possible preferred embodiment, the feed nozzle and the fuel nozzle are arranged at uniform intervals along the side wall of the furnace, spraying towards the central circle with a tangential angle of 5 to 15° and a diameter of 1 / 5 to 1 / 4 of the inner diameter of the furnace in a tangential manner.

[0010] In a possible preferred embodiment, the coolant nozzles are arranged in a ring at intervals on the third section of the furnace, spraying water mist into the furnace to form a ring spray around the swirling field. The rapid cooling of the flue gas causes the salt ash to precipitate in the form of microcrystalline particles, forming a density difference with the flue gas.

[0011] In a possible preferred embodiment, the third section inside the furnace of the vertical furnace body is further provided with a denitrification agent nozzle, which is located below the coolant nozzle.

[0012] In a possible preferred embodiment, the high-temperature activation furnace for livestock and poultry manure further includes: a boat-shaped ash hopper, which is disposed at the bottom of the vertical furnace body to receive ash, wherein the bottom of the boat-shaped ash hopper is curved and the two side walls have an inclination angle, and the inclination angle is greater than the angle of repose of the flue gas ash in the vertical furnace body.

[0013] In a possible preferred embodiment, the high-temperature activation furnace for livestock and poultry manure further includes a cooling flue, which is connected to the top of the boat-shaped ash hopper, extends upward, and is arranged opposite to the vertical furnace body to form a U-shaped channel structure within the vertical furnace body, the boat-shaped ash hopper, and the cooling flue.

[0014] In a possible preferred embodiment, the rear end of the cooling flue is inclined, and its flue outlet bends downward and extends downward to form a crane-shaped flue structure.

[0015] In a possible preferred embodiment, the inner cavity of the ash hopper is provided with a baffle plate.

[0016] To achieve the above objectives, according to another aspect of the present invention, a high-temperature activation furnace for livestock and poultry manure is also provided, comprising: a vertical furnace body and a swirl column, wherein the furnace chamber of the vertical furnace body is provided with a feed nozzle and a fuel nozzle respectively on a first section from top to bottom, a first combustion air nozzle on a second section, and a coolant nozzle on a third section, the swirl column being inserted into the furnace chamber and vertically fixed at the center of the furnace chamber by a support member, the top of the swirl column being provided with a cooling air inlet, and the bottom being provided with annularly arranged cold air nozzles extending to the fourth section of the furnace chamber, so as to define a reduction gasification zone, an oxygen combustion zone, a primary cooling zone, and a secondary cooling zone in sequence within the furnace chamber for zoned temperature control, wherein the feed nozzle and the fuel nozzle are respectively arranged in pairs, in a symmetrical tangential spray pattern around the center circle of the furnace chamber, so as to form a countercurrent airflow that generates turbulent disturbance in the central region of the furnace chamber, establishes a swirl field around the swirl column, and forms top combustion.

[0017] In a possible preferred embodiment, the temperature of each zone in the furnace of the vertical furnace body is controlled according to the reaction temperature field as follows: reduction gasification zone 1250~1150℃, oxygen combustion zone 1100~1000℃, primary cooling zone 950~850℃, and secondary cooling zone 700~600℃.

[0018] In a possible preferred embodiment, the feed nozzle and the fuel nozzle are arranged at uniform intervals along the side wall of the furnace, spraying towards the central circle with a tangential angle of 5 to 15° and a diameter of 1 / 5 to 1 / 4 of the inner diameter of the furnace in a tangential manner.

[0019] In a possible preferred embodiment, the coolant nozzles are arranged in a ring at intervals on the third section of the furnace, spraying water mist into the furnace to form a ring spray around the swirling field. The rapid cooling of the flue gas causes the salt ash to precipitate in the form of microcrystalline particles, forming a density difference with the flue gas.

[0020] In a possible preferred embodiment, the third section inside the furnace of the vertical furnace body is further provided with a denitrification agent nozzle, which is located below the coolant nozzle.

[0021] In a possible preferred embodiment, the high-temperature activation furnace for livestock and poultry manure further includes: a boat-shaped ash hopper, which is disposed at the bottom of the vertical furnace body to receive ash, wherein the bottom of the boat-shaped ash hopper is curved and the two side walls have an inclination angle, and the inclination angle is greater than the angle of repose of the flue gas ash in the vertical furnace body.

[0022] In a possible preferred embodiment, the high-temperature activation furnace for livestock and poultry manure further includes a cooling flue, which is connected to the top of the boat-shaped ash hopper, extends upward, and is arranged opposite to the vertical furnace body to form a U-shaped channel structure within the vertical furnace body, the boat-shaped ash hopper, and the cooling flue.

[0023] In a possible preferred embodiment, the rear end of the cooling flue is inclined, and its flue outlet bends downward and extends downward to form a crane-shaped flue structure.

[0024] In a possible preferred embodiment, the inner cavity of the ash hopper is provided with a baffle plate.

[0025] To achieve the above objectives, according to another aspect of the present invention, a control method for a high-temperature activation furnace for livestock and poultry manure as described in the corresponding embodiment above is also provided, the steps of which include:

[0026] The solid particles of livestock and poultry manure are mixed with combustion air and sprayed symmetrically in a tangential circle towards the center of the furnace through the feed nozzle; at the same time, fuel is mixed with combustion air and sprayed symmetrically in a tangential circle towards the center of the furnace through the fuel nozzle to ignite the solid particles, so that the solid particles form a swirling field in the furnace and the reduction gasification zone is controlled to be maintained at 1250~1150℃.

[0027] The first combustion air nozzle supplies combustion air into the furnace to maintain the temperature of the oxygen-excessive combustion zone at 1100~1000℃.

[0028] The coolant nozzle sprays water mist to control the water content of the flue gas to below 20%. Rapid cooling of the flue gas promotes the precipitation of salt ash in the form of microcrystalline particles, and keeps the primary cooling zone at 950~850℃.

[0029] Control the cold air nozzles to deliver air at a speed of 15-20 m / s, and keep the secondary cooling zone at 700~600℃.

[0030] To achieve the above objectives, according to another aspect of the present invention, a control method for a high-temperature activation furnace for livestock and poultry manure as described in the corresponding embodiment above is also provided, the steps of which include:

[0031] The solid particles of livestock and poultry manure are mixed with combustion air and sprayed symmetrically in a tangential circle towards the center of the furnace through the feed nozzle; at the same time, fuel is mixed with combustion air and sprayed symmetrically in a tangential circle towards the center of the furnace through the fuel nozzle to ignite the solid particles, so that the solid particles form a swirling field in the furnace and the reduction gasification zone is controlled to be maintained at 1250~1150℃.

[0032] The first combustion air nozzle supplies combustion air into the furnace to maintain the temperature of the oxygen-excessive combustion zone at 1100~1000℃.

[0033] The coolant nozzle sprays water mist to control the water content of the flue gas to below 20%. Rapid cooling of the flue gas promotes the precipitation of salt ash in the form of microcrystalline particles, and keeps the primary cooling zone at 950~850℃.

[0034] The swirling column is controlled to deliver air at a speed of 15-20 m / s through the cold air nozzles, maintaining the secondary cooling zone at 700~600℃.

[0035] The high-temperature activation furnace for livestock and poultry manure and its control method provided by this invention ingeniously design a vertical furnace structure to meet the gradient temperature field required for the activation of solid particles in livestock and poultry manure. Simultaneously, through the designed opposing spray structure of the feed nozzle and fuel nozzle, a top-burning swirling flow field is established within the furnace to generate sufficient centrifugal force, allowing micron-sized manure particles to be uniformly distributed radially while maintaining a stable axial flow velocity that balances with the particle settling velocity. This resolves the contradiction between small particles escaping with the airflow and large particles settling too quickly, enabling solid particles to be dispersed in a strong swirling flow field. This avoids the formation of local dense phase zones by large particles within the furnace, ensuring that the activation temperature field in the reduction and gasification zone acts uniformly on particles of every size.

[0036] In addition, the design of the first combustion air nozzle can further lift the solid particles, prevent them from settling rapidly in the furnace, and mix them with the incompletely burned solid particles to form an oxygen-rich combustion zone to quickly complete the combustion and further ensure the activation conversion rate.

[0037] Meanwhile, by setting up coolant nozzles and cold air nozzles / cold air spray holes, a dual-medium synergistic cooling system of "water spray + cold air" (primary cooling zone and secondary cooling zone) is formed. The latent heat exchange of water mist is cleverly utilized to promote the rapid nucleation of salt molecules. This mechanism enables the salt ash to form loose particles with uniform particle size distribution, avoiding the wet and sticky agglomeration caused by water spray alone. The subsequent rapid cooling through the air curtain formed by the cold air nozzle can avoid the cooling lag problem caused by the large heat capacity of coarse particles. It matches the rapid heat exchange characteristics of micron-sized particles and prevents the ash from agglomerating due to uneven cooling.

[0038] This achieves the goal of high-temperature activation of solid particles of livestock and poultry manure, providing the necessary conditions for the recovery of high-value elements such as phosphorus and potassium from ash. Attached Figure Description

[0039] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0040] Figure 1 This is a schematic cross-sectional view of the first embodiment of the high-temperature activation furnace for livestock and poultry manure of the present invention.

[0041] Figure 2 This is a top-view cross-sectional view of the feed nozzle and fuel nozzle anti-spray structure in the first embodiment of the high-temperature activation furnace for livestock and poultry manure of the present invention.

[0042] Figures 3 to 5 This is a schematic diagram of the cross-sectional structure of the boat-shaped ash hopper in the first embodiment of the high-temperature activation furnace for livestock and poultry manure of the present invention;

[0043] Figure 6 This is a cross-sectional structural schematic diagram of the second embodiment of the high-temperature activation furnace for livestock and poultry manure of the present invention;

[0044] Figure 7 This is a cross-sectional structural schematic diagram of the third embodiment of the high-temperature activation furnace for livestock and poultry manure of the present invention;

[0045] Figure 8 A schematic diagram of the control method steps for a high-temperature activation furnace for livestock and poultry manure, corresponding to Embodiment 1 of the present invention, is shown below:

[0046] Figure 9 This is a schematic diagram of the control method steps for a high-temperature activation furnace for livestock and poultry manure, corresponding to Embodiment 3 of the present invention.

[0047] Explanation of reference numerals in the attached figures

[0048] Vertical furnace body 1, boat-shaped ash hopper 2, cooling flue 3, twin-shaft slag cooler 4, water-cooled scraper conveyor 5, swirl column 6, center circle 10, feed nozzle 11, fuel nozzle 12, first combustion air nozzle 13, coolant nozzle 14, cold air nozzle 15, denitrifying agent nozzle 16, baffle plate 21, flue 31, cooling air inlet 61, cold air nozzle 62, support component 63. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solutions of the present invention, the specific technical solutions of the present invention will be clearly and completely described below in conjunction with embodiments, so as to help those skilled in the art further understand the present invention. Obviously, the embodiments described in this application are merely some embodiments of the present invention, and not all embodiments. It should be noted that, for those skilled in the art, the embodiments and features in the embodiments of this application can be combined with each other without departing from the concept of the present invention and without conflict. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the disclosure and protection scope of the present invention.

[0050] Furthermore, the terms "first," "second," "S1," "S2," etc., used in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such features can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those described herein. At the same time, the stages described in each step are not necessarily to be implemented in the same step; it should be understood that the implementation order of the contents of each step stage can be adjusted and interchanged without violating the inventive concept, so that embodiments of the invention described herein can be implemented in orders other than those described herein. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Unless otherwise expressly specified and limited, the terms "set," "arrange," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this case based on the specific circumstances and in conjunction with existing technology.

[0051] To achieve high-temperature activation treatment of livestock and poultry manure, the usual approach is to crush the raw material before feeding it into a high-temperature kiln for activation. However, many difficulties arise in actual implementation. For example, dry chicken manure contains fibrous materials, and current crushing equipment cannot meet the requirement of crushing it to the micron level. It can generally be crushed into fine particles of 200-600μm (D50≈300μm, D90≈530μm). Forcing it to be crushed to the micron level would drastically increase costs and make it uneconomical. Furthermore, this particle size range is more suitable for wet extraction of phosphorus and potassium from the activated ash residue.

[0052] Therefore, considering the feeding characteristics of excessively large original crushed chicken manure particles, a longer reaction residence time is required, and high-temperature activation uniformity must be ensured. However, conventional rotary kilns and circulating fluidized bed furnaces cannot support the activation residence time and activation uniformity of such large-diameter particles during the reduction gasification process, making it impossible to achieve the expected activation conversion rate.

[0053] Therefore, such as Figures 1 to 5 As shown, the first embodiment of the present invention provides a high-temperature activation furnace for livestock and poultry manure, which includes a vertical furnace body 1. This vertical furnace body 1 adopts an integrated structure with a top-fired, insulated furnace chamber. The furnace chamber can be constructed using steel plates and heat-insulating refractory materials (such as composite aluminosilicate fiber + lightweight heat-insulating refractory material + heavy refractory material), which can reduce the heat loss rate to below 5%. This meets the activation temperature requirements for low-calorific-value (as low as 1500 Kcal / kg) solid waste.

[0054] Among them, such as Figure 1 As shown, the vertical furnace body 1 has a feed nozzle 11 and a fuel nozzle 12 in the first section from top to bottom, a first combustion air nozzle 13 in the second section, a coolant nozzle 14 in the third section, and a cold air nozzle 15 in the fourth section, so as to define a reduction gasification zone, an oxygen combustion zone, a primary cooling zone, and a secondary cooling zone in the furnace for zoned temperature control.

[0055] Among them, such as Figures 1 to 2 As shown, to increase the suspension time of fecal solid particles in the furnace, the feed nozzle 11 and fuel nozzle 12 can each be configured as four opposing integrated nozzles, evenly arranged at 90° intervals along the top sidewall of the furnace, and symmetrically sprayed in a tangential angle of 5-15° towards a central circle 10 with a diameter of 1 / 5-1 / 4 of the furnace inner diameter at a speed of 70-100 m / s. This creates a countercurrent airflow, generating turbulent disturbance in the central region of the furnace, causing the solid particles to form a strong swirling flow field (swirling intensity can reach 4 or higher) within the furnace, generating sufficient centrifugal force, effectively extending the average residence time of the solid particles in the reduction gasification zone, thereby solving the problem of insufficient local reaction during the high-temperature activation process of solid particles.

[0056] For example, such as Figure 2 As shown, in a preferred embodiment, solid particles of livestock and poultry manure with a particle size of 200~600μm can be mixed with combustion air at a solid-to-gas ratio of 2:1 and sprayed symmetrically in a tangential circle towards the center circle 10 of the furnace through the feed nozzle 11; at the same time, diesel fuel mixed with combustion air can be sprayed symmetrically in a tangential circle towards the center circle 10 of the furnace through the fuel nozzle 12 for ignition. This causes the two media, powder and diesel fuel, to form an alternating three-dimensional swirling flow, and the high-temperature flue gas generated by combustion can also form a swirling thermal field distribution and be top-burned, so that the combustion heat is evenly contacted with the solid particles in the reduction gasification zone, maintaining the temperature of the reduction gasification zone at a stable 1250~1150℃, and accelerating the activation reaction.

[0057] This allows for a dynamic balance between the gravity of solid particles and the lifting force of the airflow, creating a stable suspended flow within the furnace. This ensures a uniform radial distribution of solid particles of this size, while maintaining a stable axial velocity of 0.8-1.5 m / s, balancing with the particle settling velocity. This resolves the mismatch between small particles escaping with the airflow and large particles settling too quickly, a problem common in traditional furnaces. Furthermore, the solid particles maintain a dispersed distribution within the strong swirling flow field, significantly improving the efficiency of filling the furnace space compared to traditional furnaces. This prevents coarse particles from forming localized dense phase zones within the furnace, ensuring that the temperature field in the 1250-1150℃ reduction gasification zone acts uniformly on particles of every size.

[0058] This design allows for better control of the residence time of solid particles with a diameter of 200-600μm within the furnace. Compared to bottom-fired furnaces, this method avoids the problem of long residence times for small particles and short residence times for large particles found in bottom-fired furnaces (where approximately 60% of large particles settle rapidly to the bottom due to gravity and cannot rise with the flue gas). The more uniform temperature distribution within the furnace also ensures that the residence time deviation in the reduction and gasification zone is controlled within ±5%, significantly improving the activation conversion rate of organic phosphorus to inorganic phosphorus in chicken manure.

[0059] Furthermore, to promote complete combustion of solid particles, in a preferred embodiment, the first combustion air nozzle 13 installed on the second section of the furnace can, on the one hand, deliver combustion air to the swirling flow field to mix intensely with the incompletely burned solid particles, forming an oxygen-rich combustion zone (temperature controlled at 1100~1000℃), and quickly achieving complete combustion. On the other hand, the high-speed airflow field input at 70-100m / s can maintain a high-velocity swirling flow field and form a film lifting effect, which precisely counteracts the gravitational settling tendency of particles within these particle size ranges, thus lifting the solid particles and preventing them from settling rapidly in the furnace. At the same time, the gradient distribution of the reducing and oxidizing atmospheres matches the pyrolysis process of the particles from the center to the edge, thereby satisfying the gradient temperature field (temperature difference controlled within ±30℃) required for ash activation of solid particles of these particle sizes, realizing a stepwise reaction from the release of volatiles to the combustion of fixed carbon.

[0060] Furthermore, considering the melting point characteristics of mixed ash such as CaO (melting point 2572℃), KCl (melting point 770℃), and Ca2P2O7 (melting point 970℃) in chicken manure ash (the softening temperature of the main salts is about 800-950℃), in this example, coolant nozzles 14 and cold air nozzles 15 are respectively installed in the third and fourth sections of the furnace to form a "water spray + cold air" dual-medium synergistic cooling and rapid cooling section in the lower part of the furnace (between the activation section and the dust removal section). This rapidly cools the salt ash, causing the salts to precipitate in the form of microcrystalline particles, thus avoiding the agglomeration of salts caused by the delayed rapid cooling in traditional furnace types.

[0061] Specifically, in the preferred embodiment, the coolant nozzles 14 are arranged in a ring at intervals on the third section of the furnace (preferably with a spacing of 1 / 6 of the furnace diameter), spraying water mist (e.g., atomized particle size less than 100μm) into the furnace to form a ring spray around the swirling flow field. This creates uniform contact with the salt ash in the radial cross-section, increasing the collision efficiency between the droplets and ash particles by more than 60% compared to traditional single-nozzle rapid cooling. This ensures synchronous cooling of the salt ash at different radial positions, solving the problem of localized salt melting residue caused by radial temperature differences in the furnace. This achieves preliminary rapid cooling of the flue gas and ash in the furnace, controlling the rapid cooling temperature in the primary cooling zone at 950~850℃ and the flue gas moisture content below 20%. Simultaneously, the circumferentially arranged cold air nozzles 15 form an air curtain for secondary cooling at a wind speed of 15-20m / s, controlling the rapid cooling temperature in the secondary cooling zone at 700~600℃.

[0062] This setup allows for initial rapid cooling via water spray. The latent heat exchange of the water mist promotes rapid nucleation of salt molecules, resulting in loosely distributed salt ash particles with a uniform size distribution (10-50 μm), avoiding the wet, sticky agglomeration caused by a single water spray. Subsequent cooling via a curtain of cold air (15-20 m / s) lowers the temperature of the flue gas and ash from over 1150°C in the activation section of the reduction gasification zone to 600°C within one second. This avoids the cooling lag caused by the large heat capacity of coarse particles and matches the rapid heat exchange characteristics of particles of this size, preventing ash agglomeration due to uneven cooling. This approach avoids ash agglomeration caused by water spraying alone and solves the problem of high cold air consumption in air-cooled cooling alone. It provides stable flue gas humidity conditions for subsequent ash collection processes. At the same time, rapid cooling of flue gas can also promote the precipitation of salt ash in the form of microcrystalline particles, forming a density difference with the flue gas, accelerating sedimentation, reducing the amount of salt particles entering the downstream washing system, and reducing the risk of salt scale blockage in subsequent equipment.

[0063] Furthermore, in order to reduce NOx emissions, in optional implementations, such as Figure 1 As shown, the vertical furnace body 1 is further provided with a denitrification agent nozzle 16 in the third section of the furnace chamber. It is located below the coolant nozzle 14 and can be used to spray a denitrification agent containing a dilute solution of urea or ammonia into the furnace chamber through a dual-fluid spray gun atomized by compressed air. The agent is fully covered and mixed with the high-temperature flue gas. Together with the water mist sprayed by the coolant nozzle 14, the rapid cooling temperature of the primary cooling zone is controlled at 950~850℃, which reaches the temperature window for high-temperature denitrification in the furnace and inhibits and reduces NOx generation.

[0064] Furthermore, such as Figure 1 , Figures 3 to 4As shown, in a preferred embodiment, the high-temperature activation furnace for livestock and poultry manure further includes a boat-shaped ash hopper 2, which is set at the bottom of the vertical furnace body 1 to receive ash. The ash collection method of this structure is dry. The gas phase space of the boat-shaped ash hopper 2 can be increased to appropriately reduce the linear velocity of the gas and solid phases, which is conducive to the settling of particles and reduces the amount of dust carried downstream by the flue gas.

[0065] Among them, such as Figure 4 The bottom of the boat-shaped ash hopper 2 shown is designed with a curved surface, with a preferred bottom curvature radius R = 300~500mm and a preferred inclination angle of the two side walls α = 60-75°; Figure 3 As shown, the inclination angles on both sides of the boat-shaped ash hopper 2 can be set to be greater than the angle of repose of the flue gas ash inside the vertical furnace body 1 to prevent ash accumulation and blockage of the ash hopper. Furthermore, the inner wall of the boat-shaped ash hopper 2 can be made of heat-insulating and refractory alumina ceramic material to meet the ash reduction requirements under the 600℃ high-temperature environment inside the boat-shaped ash hopper 2. Simultaneously, the guiding effect of the boat-shaped curved surface allows the ash to form a continuous flow, avoiding conveying blockages caused by localized accumulation.

[0066] Furthermore, in alternative implementations, such as Figure 5 As shown, a baffle plate 21 can be added inside the boat-shaped ash hopper 2 to improve the flow of flue gas, increase the flue gas filling degree inside the boat-shaped ash hopper 2, and prolong the residence time of flue gas inside the boat-shaped ash hopper 2. The baffle plate also causes the mixed gas to collide back and forth with the ash hopper wall, which is beneficial to gas-dust separation.

[0067] Furthermore, such as Figure 1 As shown, the high-temperature activation furnace for livestock and poultry manure also includes a cooling flue 3, which is connected to the top of the boat-shaped ash hopper 2 and extends upwards. It is arranged opposite to the vertical furnace body 1 to form a U-shaped channel structure in the vertical furnace body 1, the boat-shaped ash hopper 2, and the cooling flue 3, thereby reducing the airflow velocity and effectively recovering fine particulate ash in the flue gas to form dry ash, reducing the amount of ash entering the subsequent water washing tower or membrane wall boiler.

[0068] Specifically, the cooling flue 3 adopts a vertically upward extension design, and the height ratio of the vertical furnace body 1 is preferably 1:0.5-1:1. With this setting, the closed U-shaped channel structure formed by the cooling flue 3, the vertically arranged furnace body 1, and the boat-shaped ash hopper 2 can utilize the synergistic effect of gravity and airflow traction, and the density difference between salt particles and flue gas, to form a low-speed zone at the point where the channel turns to the boat-shaped ash hopper 2.

[0069] After rapid cooling, the salt particles settle at a rate more than 30% higher efficiency than in a straight-channel design due to the combined effects of gravity and centrifugal force. This reduces the amount of salt particles entering the downstream washing system, lowers the risk of scale buildup in subsequent equipment, and ensures long-term operation. The ash flow throughout the system is characterized by a continuous cycle of activation, collection, and cooling (ideally with a stable flow velocity of 0.8-1.5 m / s). The low-velocity airflow recirculation zone created by this U-shaped structure effectively recovers fine particulate ash from the flue gas, forming dry ash and reducing the amount of ash entering the baghouse dust collector.

[0070] Furthermore, to prevent dust accumulation, such as Figure 1 As shown, the rear end of the cooling flue 3 is inclined, and its outlet 31 bends downward and extends downward to form a crane-shaped flue structure. The cross-sectional size of the outlet 31 section is smaller than that of the other sections, thereby increasing the flue gas velocity and minimizing gas-solid separation, thus reducing the risk of ash accumulation and blockage in the flue.

[0071] After subsequent cooling or waste heat recovery, the flue gas is approximately 200°C and still contains small amounts of dust, SO2, and HCl pollutants. The flue gas can then be further fed into a bag filter or wet scrubbing tower, or a series of alkaline scrubbing towers, to completely capture the ash while neutralizing and removing acidic gases with alkali. This ensures that all pollutants in the flue gas emitted through the high-altitude chimney meet the lower limit requirements of environmental protection standards.

[0072] Through this setup, by spatially coupling the cooling flue 3 with the vertical furnace body 1, synergistically combining dual-medium cooling with salt characteristics, and optimizing the connection between the U-shaped channel and the boat-shaped ash hopper 2, a high-temperature activation-precise rapid cooling-efficient sedimentation salt ash granulation treatment system was constructed. This solved the problems of agglomeration, caking, and blockage caused by differences in melting points of salt ash, increasing the salt ash recovery rate at the furnace bottom by more than 30%. This provides a stable raw material for subsequent extraction of high-value elements (such as phosphorus and potassium), while significantly extending the operating cycle of the device (the operating cycle of conventional salt-containing furnaces is only 1-3 months, with severe blockage problems, making long-term operation impossible).

[0073] Furthermore, the activation furnace scheme described above, with its internal temperature gradient distribution and flow field, not only provides a reducing gasification atmosphere but also includes a high-temperature non-catalytic reduction denitrification zone. The high-intensity swirling flow field formed within the furnace can simultaneously reduce the temperature of the high-temperature flame zone, thus suppressing and reducing NOx formation. Theoretically, this can achieve ultra-low NOx emissions, i.e., 50 mg / m³. 3 the following.

[0074] On the other hand, such as Figure 6As shown, in an optional embodiment, based on the first embodiment, the high-temperature activation furnace for livestock and poultry manure proposed in the second embodiment of the present invention further includes: a twin-shaft slag cooler 4 and a water-cooled scraper conveyor 5, wherein the twin-shaft slag cooler 4 is located at the lower part of the boat-shaped ash hopper 2, receives the cooled ash slag, and recycles it through the water-cooled scraper conveyor 5 to continue to recover the effective components in the ash or directly use it as a by-product (such as salt).

[0075] On the other hand, such as Figure 7 As shown, the third embodiment of the present invention also provides a high-temperature activation furnace for livestock and poultry manure, which includes: a vertical furnace body 1 and a swirl column 6. The furnace chamber of the vertical furnace body 1 is provided with a feed nozzle 11 and a fuel nozzle 12 in the first section from top to bottom, a first combustion air nozzle 13 in the second section, and a coolant nozzle 14 in the third section. The swirl column 6 is inserted into the furnace chamber and is vertically fixed at the center of the furnace chamber by a support member 63. The top of the swirl column 6 is provided with a cooling air inlet 61, and the bottom is provided with a ring of cold air nozzles 62 extending to the fourth section of the furnace chamber, so as to define a reduction gasification zone, an oxygen combustion zone, a primary cooling zone, and a secondary cooling zone in the furnace chamber for zoned temperature control.

[0076] The feed nozzle 11 and fuel nozzle 12 are respectively arranged in pairs, in a symmetrical tangential spray pattern around the center circle 10 of the furnace, so as to form opposing airflow, generate turbulent disturbance in the central region of the furnace, establish a swirling field around the swirling column 6, and form top combustion.

[0077] Guided by the swirl column 6, the swirl field extends vertically, guiding solid dust particles to rotate and fall around the central swirl column 6. This results in a dispersed distribution of solid particles within the strong vertical swirl field, significantly improving the efficiency of filling the furnace space compared to traditional furnace types. It also prevents coarse particles from forming localized dense phase zones within the furnace, ensuring that the temperature field of the 1250~1150℃ reduction gasification zone acts uniformly on particles of every size. The ash is then guided through the cold air nozzles 62 at the bottom of the swirl column 6 for secondary cooling of the flue gas. Furthermore, the first combustion air nozzle 13 and coolant nozzle 14, located in the second and third sections of the furnace, have similar functions and structures to those in Embodiment 1, and will not be described further here.

[0078] Furthermore, in a preferred embodiment, the high-temperature activation furnace for livestock and poultry manure further includes: a boat-shaped ash hopper 2, which is disposed at the bottom of the vertical furnace body 1 to receive ash. The bottom of the boat-shaped ash hopper 2 is designed with a curved surface, and the radius of curvature of the bottom is preferably R=300~500mm, and the inclination angle of the two side walls is preferably α=60-75°. The inclination angle of the other two sides of the boat-shaped ash hopper 2 can be set to be greater than the angle of repose of the flue gas ash in the vertical furnace body 1, so as to prevent ash accumulation and blockage of the ash hopper.

[0079] In an optional embodiment, a baffle plate 21 can be added inside the boat-shaped ash hopper 2 to improve the flow of flue gas, increase the flue gas filling degree inside the boat-shaped ash hopper 2, and prolong the residence time of flue gas inside the boat-shaped ash hopper 2. The baffle causes the mixed gas to hit the ash hopper wall back and forth, which is beneficial to gas-dust separation.

[0080] Furthermore, the high-temperature activation furnace for livestock and poultry manure also includes a cooling flue 3, which is connected to the top of the boat-shaped ash hopper 2 and extends upwards, arranged opposite to the vertical furnace body 1, so as to form a U-shaped channel structure in the vertical furnace body 1, the boat-shaped ash hopper 2, and the cooling flue 3, thereby reducing the airflow velocity and effectively recovering fine particulate ash in the flue gas to form dry ash, reducing the amount of ash entering the subsequent water washing tower or membrane wall boiler.

[0081] The cooling flue 3 is designed to extend vertically upwards, and the height ratio of the cooling flue 3 to the vertical furnace body 1 is preferably 1:0.5-1:1. With this design, the closed U-shaped channel structure formed by the cooling flue 3, the vertically arranged furnace body 1, and the boat-shaped ash hopper 2 can utilize the synergistic effect of gravity and airflow traction, and the density difference between salt particles and flue gas, to form a low-speed zone at the point where the channel turns to the boat-shaped ash hopper 2.

[0082] After rapid cooling, the salt particles settle at a rate more than 30% higher efficiency than in a straight-channel design due to the combined effects of gravity and centrifugal force. This reduces the amount of salt particles entering the downstream scrubbing system, lowers the risk of scale buildup in subsequent equipment, and ensures long-term operation. The ash flow throughout the system is characterized by a continuous cycle of activation, collection, and cooling (ideally with a stable flow velocity of 0.8-1.5 m / s). The low-speed airflow recirculation zone created by this U-shaped structure effectively recovers fine particulate ash from the flue gas, forming dry ash and reducing the amount of ash entering the scrubbing tower or membrane boiler.

[0083] In addition, the cooling flue 3 can also be equipped with a cavity membrane wall boiler, so that the flue gas can be further cooled and waste heat recovered while ash is captured, and the ash can be collected efficiently in a dry state to the greatest extent.

[0084] Furthermore, to prevent ash accumulation, the rear end of the cooling flue 3 is inclined, and its smoke outlet 31 bends downward and extends downward to form a crane-shaped flue structure. The cross-sectional dimensions of the smoke outlet 31 section are smaller than those of the other sections, thereby increasing the flue gas velocity and minimizing gas-solid separation, thus reducing the risk of ash accumulation and blockage in the flue.

[0085] After subsequent cooling or waste heat recovery, the flue gas is approximately 200°C and still contains small amounts of dust, SO2, and HCl pollutants. The flue gas can then be further fed into a bag filter or wet scrubbing tower, with the alkaline scrubbing towers set in cascade. This will completely capture the ash while neutralizing and removing acidic gases with alkali, ensuring that all pollutants in the flue gas emitted through the high-altitude chimney meet the lower limit requirements of environmental protection standards.

[0086] Furthermore, in an optional embodiment, the high-temperature activation furnace for livestock and poultry manure also includes: a twin-shaft slag cooler 4 and a water-cooled scraper conveyor 5, wherein the twin-shaft slag cooler 4 is located at the lower part of the boat-shaped ash hopper 2, receives the cooled ash slag, and recycles it through the water-cooled scraper conveyor 5 to continue to recover the effective components in the ash or directly use it as a by-product (such as salt).

[0087] On the other hand, such as Figure 8 As shown, the present invention also provides a control method for a high-temperature activation furnace for livestock and poultry manure corresponding to the above embodiment one, the steps of which include:

[0088] Step S1: Mix livestock and poultry manure solid particles with combustion air and spray them symmetrically in a tangential circle towards the center circle 10 of the furnace through the feed nozzle 11; at the same time, mix fuel with combustion air and spray it symmetrically in a tangential circle towards the center circle 10 of the furnace through the fuel nozzle 12 to ignite it, so that the solid particles form a swirling field in the furnace and the reduction gasification zone is controlled to be maintained at 1250~1150℃.

[0089] Step S2: The first combustion air nozzle 13 supplies combustion air into the furnace to maintain the temperature of the oxygen-excess combustion zone at 1100~1000℃.

[0090] Step S3 involves spraying water mist from coolant nozzle 14 to control the water content of flue gas to below 20%. Rapid cooling of the flue gas promotes the precipitation of salt ash in the form of microcrystalline particles, maintaining the primary cooling zone at 950~850℃.

[0091] Step S4 controls the cold air nozzle 15 to deliver air at a wind speed of 15-20m / s to keep the secondary cooling zone at 700~600℃.

[0092] In a preferred embodiment, step S1, which involves mixing solid particles of livestock and poultry manure with combustion-supporting air, includes:

[0093] Step S11 involves crushing livestock and poultry manure into solid particles of 200-600 μm size and mixing it with combustion air at a solid-gas ratio of 2:1.

[0094] On the other hand, such as Figure 9 As shown, the present invention also provides a control method for a high-temperature activation furnace for livestock and poultry manure corresponding to Embodiment 3 above, the steps of which include:

[0095] Step S1: Mix livestock and poultry manure solid particles with combustion air and spray them symmetrically in a tangential circle towards the center circle 10 of the furnace through the feed nozzle 11; at the same time, mix fuel with combustion air and spray it symmetrically in a tangential circle towards the center circle 10 of the furnace through the fuel nozzle 12 to ignite it, so that the solid particles form a swirling field in the furnace and the reduction gasification zone is controlled to be maintained at 1250~1150℃.

[0096] Step S2: The first combustion air nozzle 13 supplies combustion air into the furnace to maintain the temperature of the oxygen-excess combustion zone at 1100~1000℃.

[0097] Step S3 involves spraying water mist from coolant nozzle 14 to control the water content of flue gas to below 20%. Rapid cooling of the flue gas promotes the precipitation of salt ash in the form of microcrystalline particles, maintaining the primary cooling zone at 950~850℃.

[0098] Step S4 controls the swirl column 6 to deliver air through the cold air nozzle 62 at a wind speed of 15-20 m / s, maintaining the secondary cooling zone at 700~600℃.

[0099] In a preferred embodiment, step S1, which involves mixing solid particles of livestock and poultry manure with combustion-supporting air, includes:

[0100] Step S11 involves crushing livestock and poultry manure into solid particles with a particle size of 200-600 μm and mixing it with dilute phase air at a solid-to-gas ratio of 2:1.

[0101] In summary, the high-temperature activation furnace and control method for livestock and poultry manure provided by this invention ingeniously designs a vertical furnace body 1 structure to meet the gradient temperature field required for the activation of solid particles in livestock and poultry manure. Simultaneously, through the designed opposing spray structure of the feed nozzle 11 and fuel nozzle 12, a top-burning swirling flow field is established within the furnace to generate sufficient centrifugal force, allowing micron-sized manure particles to be uniformly distributed radially while maintaining a stable axial flow velocity that balances with the particle settling velocity. This resolves the contradiction between small particles escaping with the airflow and large particles settling too quickly, enabling solid particles to be dispersed in a strong swirling flow field. This avoids the formation of local dense phase zones by large particles within the furnace, ensuring that the activation temperature field in the reduction and gasification zone acts uniformly on particles of every size. This achieves the goal of high-temperature activation of solid particles in livestock and poultry manure, providing the necessary conditions for recovering high-value elements such as phosphorus and potassium from ash.

[0102] Furthermore, although the above example uses chicken manure as an example for illustrative purposes, it is understood by those skilled in the art that this solution can also be applied to other solid feedstocks, such as biomass, sludge, and other types of livestock and poultry manure, without exceeding the scope of the above example concept. As long as most of the moisture is removed by preliminary drying or low-temperature carbonization, and then crushed by a dry crusher and fed into a drum screen to remove large particles of impurities or animal fibers, the remaining fine solid particles can be rapidly activated at high temperature under normal pressure in the activation furnace of this solution.

[0103] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

[0104] Simultaneously, all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0105] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A high-temperature activation furnace for livestock and poultry manure, comprising: The vertical furnace body has, from top to bottom, a first section with a feed nozzle and a fuel nozzle, a second section with a first combustion air nozzle, a third section with a coolant nozzle, and a fourth section with a cold air nozzle. This design sequentially defines a reduction gasification zone, an oxygen-over-combustion zone, a primary cooling zone, and a secondary cooling zone within the furnace for zoned temperature control. The feed nozzle and fuel nozzle are arranged in pairs, forming a symmetrical tangential spray pattern around the center of the furnace. This creates opposing airflows that generate turbulent disturbances in the central region of the furnace, establishing a swirling flow field and forming top combustion.

2. The high-temperature activation furnace for livestock and poultry manure according to claim 1, wherein the temperature of each zone in the furnace chamber of the vertical furnace body is controlled according to the reaction temperature field as follows: reduction and gasification zone 1250~1150℃, oxygen combustion zone 1100~1000℃, primary cooling zone 950~850℃, and secondary cooling zone 700~600℃.

3. The high-temperature activation furnace for livestock and poultry manure according to claim 1, wherein the feed nozzle and the fuel nozzle are arranged at uniform intervals along the side wall of the furnace, and spray towards the center circle with a tangential angle of 5 to 15°, which is 1 / 5 to 1 / 4 of the inner diameter of the furnace, in a tangential manner.

4. The high-temperature activation furnace for livestock and poultry manure according to claim 1, wherein the coolant nozzles are arranged in a ring at intervals on the third section of the furnace, spraying water mist into the furnace to form a ring spray around the swirling flow field, and the rapid cooling of the flue gas causes the salt ash to precipitate in the form of microcrystalline particles, forming a density difference with the flue gas.

5. The high-temperature activation furnace for livestock and poultry manure according to claim 1, wherein the third section of the furnace chamber of the vertical furnace body is further provided with a denitrification agent nozzle, which is located below the coolant nozzle.

6. The high-temperature activation furnace for livestock and poultry manure according to any one of claims 1 to 5, further comprising: The boat-shaped ash hopper is set at the bottom of the vertical furnace body to collect ash. The bottom of the boat-shaped ash hopper is curved, and the two side walls have an inclination angle, which is greater than the angle of repose of the flue gas ash in the vertical furnace body.

7. The high-temperature activation furnace for livestock and poultry manure according to claim 6, further comprising: The cooling flue is connected to the top of the boat-shaped ash hopper and extends upwards, arranged opposite to the vertical furnace body, so as to form a U-shaped channel structure in the vertical furnace body, the boat-shaped ash hopper and the cooling flue.

8. The high-temperature activation furnace for livestock and poultry manure according to claim 7, wherein the rear end of the cooling flue is inclined and its flue outlet bends downward and extends downward to form a crane-shaped flue structure.

9. The high-temperature activation furnace for livestock and poultry manure according to any one of claims 6, wherein the inner cavity of the ash hopper is provided with a baffle plate.

10. A high-temperature activation furnace for livestock and poultry manure, comprising: The furnace body is a vertical furnace with a swirling column. The furnace chamber of the vertical furnace body has, from top to bottom, a first section with a feed nozzle and a fuel nozzle, a second section with a first combustion air nozzle, and a third section with a coolant nozzle. The swirling column is inserted into the furnace chamber and vertically fixed at the center of the furnace chamber by a support member. The top of the swirling column has a cooling air inlet, and the bottom has an annular arrangement of cold air nozzles extending to the fourth section of the furnace chamber. This defines a reduction gasification zone, an oxygen-overflow combustion zone, a primary cooling zone, and a secondary cooling zone within the furnace chamber for zoned temperature control. The feed nozzle and fuel nozzle are arranged in pairs, symmetrically tangentially around the center of the furnace chamber, to create opposing airflows that generate turbulent disturbances in the central region of the furnace chamber, establishing a swirling field around the swirling column and forming top combustion.

11. The high-temperature activation furnace for livestock and poultry manure according to claim 10, wherein the temperature of each zone in the furnace chamber of the vertical furnace body is controlled according to the reaction temperature field as follows: reduction gasification zone 1250~1150℃, oxygen combustion zone 1100~1000℃, primary cooling zone 950~850℃, and secondary cooling zone 700~600℃.

12. The high-temperature activation furnace for livestock and poultry manure according to claim 10, wherein the feed nozzle and the fuel nozzle are arranged at uniform intervals along the side wall of the furnace, and spray towards the center circle with a tangential angle of 5 to 15°, which is 1 / 5 to 1 / 4 of the inner diameter of the furnace, in a tangential manner.

13. The high-temperature activation furnace for livestock and poultry manure according to claim 10, wherein the coolant nozzles are arranged in a ring at intervals on the third section of the furnace, spraying water mist into the furnace to form a ring spray around the swirling flow field, and the rapid cooling of the flue gas causes the salt ash to precipitate in the form of microcrystalline particles, forming a density difference with the flue gas.

14. The high-temperature activation furnace for livestock and poultry manure according to claim 10, wherein the third section of the furnace chamber of the vertical furnace body is further provided with a denitrification agent nozzle, which is located below the coolant nozzle.

15. The high-temperature activation furnace for livestock and poultry manure according to any one of claims 10 to 15, further comprising: The boat-shaped ash hopper is set at the bottom of the vertical furnace body to collect ash. The bottom of the boat-shaped ash hopper is curved, and the two side walls have an inclination angle, which is greater than the angle of repose of the flue gas ash in the vertical furnace body.

16. The high-temperature activation furnace for livestock and poultry manure according to claim 15, further comprising: The cooling flue is connected to the top of the boat-shaped ash hopper and extends upwards, arranged opposite to the vertical furnace body, so as to form a U-shaped channel structure in the vertical furnace body, the boat-shaped ash hopper and the cooling flue.

17. The high-temperature activation furnace for livestock and poultry manure according to claim 16, wherein the rear end of the cooling flue is inclined and its flue outlet bends downward and extends downward to form a crane-shaped flue structure.

18. The high-temperature activation furnace for livestock and poultry manure according to any one of claims 15, wherein the inner cavity of the ash hopper is provided with a baffle plate.

19. A control method for a high-temperature activation furnace for livestock and poultry manure as described in any one of claims 1 to 9, comprising the following steps: The solid particles of livestock and poultry manure are mixed with combustion air and sprayed symmetrically in a tangential circle towards the center of the furnace through the feed nozzle. At the same time, the fuel is mixed with combustion air and ignited by symmetrical tangential injection into the center circle of the furnace through fuel nozzles, so that the solid particles form a swirling field in the furnace and the reduction gasification zone is controlled to maintain 1250~1150℃. The first combustion air nozzle supplies combustion air into the furnace to maintain the temperature of the oxygen-excessive combustion zone at 1100~1000℃. The coolant nozzle sprays water mist to control the water content of the flue gas to below 20%. Rapid cooling of the flue gas promotes the precipitation of salt ash in the form of microcrystalline particles, and keeps the primary cooling zone at 950~850℃. Control the cold air nozzles to deliver air at a speed of 15-20 m / s, and keep the secondary cooling zone at 700~600℃.

20. A method for controlling a high-temperature activation furnace for livestock and poultry manure as described in any one of claims 10 to 18, comprising the following steps: The solid particles of livestock and poultry manure are mixed with combustion air and sprayed symmetrically in a tangential circle towards the center of the furnace through the feed nozzle. At the same time, the fuel is mixed with combustion air and ignited by symmetrical tangential injection into the center circle of the furnace through fuel nozzles, so that the solid particles form a swirling field in the furnace and the reduction gasification zone is controlled to maintain 1250~1150℃. The first combustion air nozzle supplies combustion air into the furnace to maintain the temperature of the oxygen-excessive combustion zone at 1100~1000℃. The coolant nozzle sprays water mist to control the water content of the flue gas to below 20%. Rapid cooling of the flue gas promotes the precipitation of salt ash in the form of microcrystalline particles, and keeps the primary cooling zone at 950~850℃. The swirling column is controlled to deliver air at a speed of 15-20 m / s through the cold air nozzles, maintaining the secondary cooling zone at 700~600℃.

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