Pyrolysis furnace

Abstract

The pyrolyzing furnace comprises a furnace body, a first spiral blade, a shell and a second spiral blade, the furnace body is provided with a cavity, a feeding port, a slag outlet and a gas outlet, the feeding port, the slag outlet and the gas outlet are all communicated with the cavity, and the feeding port is suitable for feeding materials so that the materials can be heated in the cavity; the first spiral blade is arranged in the cavity and spirally extends in the circumferential direction of the furnace body from top to bottom, the furnace body is sleeved with the shell, the inner circumferential face of the shell and the outer circumferential face of the furnace body are arranged in a spaced mode in the inside-outside direction to form a flue, the shell is provided with a smoke inlet and a smoke outlet, the smoke inlet and the smoke outlet are both communicated with the flue, and the second spiral blade is arranged in the flue. And the second spiral blade spirally extends along the circumferential direction of the furnace body from top to bottom around the peripheral surface of the furnace body. The pyrolyzing furnace has the advantages of simple structure, high pyrolyzing efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical environmental protection, and in particular to a pyrolysis furnace. Background Art

[0002] The main function of the denitrification agent pyrolysis furnace is to prepare or activate the denitrification agent through pyrolysis reaction during the production or application of the denitrification agent, thereby reducing the emission of nitrogen oxides (NOx) in the flue gas.

[0003] In the related art, the denitrification agent pyrolysis furnace has low pyrolysis efficiency and high residue generation. Summary of the Invention

[0004] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0005] In related technologies, pyrolysis furnaces mostly adopt a straight-through structure or a simple baffle design, and the material residence time in the furnace is short (usually less than 10 seconds), resulting in insufficient pyrolysis of solid denitrification agents such as ammonium carbamate, and a high residual amount of by-products (such as isocyanate HNCO) (>5%), which seriously affects the denitrification efficiency and increases the subsequent environmental protection treatment costs. In addition, traditional furnace bodies mostly adopt a single-layer cylindrical structure, the heat source (such as high-temperature flue gas) and the material heat exchange time is short, the thermal energy utilization rate is low (<60%), and it is difficult to uniformly control the reaction temperature (local temperature difference >50°C), which further aggravates the problem of incomplete pyrolysis. In terms of corrosiveness, the ammonia, carbon dioxide and acidic intermediates released by ammonium carbamate at high temperature are highly corrosive to ordinary stainless steel (such as 304). The inner wall of the traditional furnace is prone to pitting corrosion or coating peeling, and the equipment life is usually less than 3 years.

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, an embodiment of the present invention provides a pyrolysis furnace with high pyrolysis efficiency and low residue generation.

[0008] The pyrolysis furnace according to an embodiment of the present invention includes: a furnace body, the furnace body having a chamber, a feed port, a slag outlet and a gas outlet, the feed port, the slag outlet and the gas outlet are all connected to the chamber, the feed port is suitable for passing material so that the material is heated in the chamber, the slag outlet is used to discharge the slag after pyrolysis in the chamber, and the gas outlet is used to discharge the gas in the chamber; a first spiral blade, the first spiral blade is arranged in the chamber and spirally extends from top to bottom along the circumference of the furnace body so that the material flows in the chamber through the first spiral blade; a shell, the shell covers A smoke duct is provided outside the furnace body, and the inner circumferential surface of the shell and the outer circumferential surface of the furnace body are spaced apart in the inner and outer directions to form a flue. The shell has a smoke inlet and a smoke outlet, and the smoke inlet and the smoke outlet are both connected to the flue. The smoke inlet is used to introduce smoke so that the smoke flows into the flue so that the smoke can pass through the flue to the material in the furnace body; a second spiral blade, the second spiral blade is provided in the flue, and the second spiral blade extends spirally from top to bottom around the outer circumferential surface of the furnace body along the circumference of the furnace body so that the smoke flows in the flue through the second spiral blade.

[0009] The pyrolysis furnace of the embodiment of the present invention is provided with a furnace body, a first spiral blade, a shell and a second spiral blade, which prolongs the pyrolysis time of the material in the furnace body, reduces the flow velocity of the flue gas in the flue, and improves the heat exchange efficiency and thermal energy utilization rate of the flue gas.

[0010] In some embodiments, the furnace body includes a first section, a second section and a third section, the first section is arranged above the second section and is connected to the second section, the third section is arranged below the second section and is connected to the second section, the feed port and the gas outlet are both arranged on the first section, the slag outlet is arranged below the third section, the first spiral blade is arranged in the second section, and the shell is sleeved on the outer peripheral surface of the second section.

[0011] In some embodiments, the inner circumference of the first section is spherical, the shell is cylindrical, and the ratio of the diameter of the inner circumference of the first section to the diameter of the inner circumference of the shell is 1:1.2.

[0012] In some embodiments, the cross-sectional area of the inner circumference of the third section gradually decreases from top to bottom. In the projection plane orthogonal to the inner and outer directions, the inner circumference of the third section intersects the upper and lower directions at an angle of 50°-70°.

[0013] In some embodiments, the shell is made of Q345R, the furnace body is made of Hastelloy or titanium alloy, the thickness of the furnace body is not less than 3 mm, and the inner circumference of the third end is coated with a silicon carbide coating.

[0014] In some embodiments, the pitch of the first spiral blade is 300 mm-500 mm, and the pitch of the second spiral blade is 400 mm-600 mm.

[0015] In some embodiments, the smoke inlet is disposed adjacent to the bottom of the furnace body, and the smoke outlet is disposed adjacent to the top of the shell.

[0016] In some embodiments, the pyrolysis furnace further includes a pulse soot blower, which is connected to the smoke inlet so that the pulse soot blower cleans the flue, and the operating frequency of the pulse soot blower is 0.2 Hz-1 Hz.

[0017] In some embodiments, the pyrolysis furnace further includes a waste heat recovery component, and the preheat recovery component is connected to the smoke outlet so that the waste heat recovery component recovers waste heat of the smoke flowing out of the smoke outlet.

[0018] In some embodiments, the feed port includes a first port and a second port, the first port and the second port are both located at the top of the furnace body and communicate with the chamber, and the first port and the second port are symmetrically arranged in the up and down directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a pyrolysis furnace according to an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of the structure of the first spiral blade and the second spiral blade of the pyrolysis furnace in an embodiment of the present invention.

[0021] 100. Pyrolysis furnace; 1. Furnace body; 11. First section; 12. Second section; 13. Third section; 14. Chamber; 15. Feed inlet; 16. Slag outlet; 17. Gas outlet; 2. First spiral blade; 3. Shell; 31. Smoke inlet; 32. Smoke outlet; 4. Second spiral blade. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] The following describes a pyrolysis furnace 100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0024] like Figure 1-2 As shown, the pyrolysis furnace 100 according to an embodiment of the present invention includes a furnace body 1 , a first spiral blade 2 , a shell 3 and a second spiral blade 4 .

[0025] The furnace body 1 has a chamber 14, a feed port 15, a slag outlet 16 and a gas outlet 17. The feed port 15, the slag outlet 16 and the gas outlet 17 are all connected to the chamber 14. The feed port 15 is suitable for feeding materials so that the materials are heated in the chamber 14. The slag outlet 16 is used to discharge the slag after pyrolysis in the chamber 14. The gas outlet 17 is used to discharge the gas in the chamber 14. Specifically, Figure 1 As shown, the material (for example, solid denitrification agents such as ammonium carbamate) flows into the chamber 14 through the feed port 15, so that the material is thermally decomposed in the chamber 14 to generate ammonia, carbon dioxide and water. The ammonia and carbon dioxide are discharged from the chamber 14 through the outlet 17. The ammonia in the decomposition product can be used in other industrial processes, such as nitrogen fertilizer production, to achieve resource recovery. The unreacted material and the by-products generated during the reaction (such as isocyanate HNCO) are mixed to form a slag, which is discharged from the chamber 14 through the slag outlet 16.

[0026] The first spiral blade 2 is provided in the chamber 14 and spirally extends from top to bottom along the circumference of the furnace body 1 so that the material flows in the chamber 14 through the first spiral blade 2. Specifically, Figure 1 and Figure 2 As shown, the first spiral blade 2 is arranged in the chamber 14 and is spirally arranged in the up and down directions, so that the material flows in a spiral in the chamber 14 through the first spiral blade 2, thereby extending the flow time of the material in the chamber 14, extending the pyrolysis time of the material in the chamber 14, and improving the pyrolysis efficiency of the pyrolysis furnace 100.

[0027] The shell 3 is sleeved on the outside of the furnace body 1 and the inner circumference of the shell 3 is spaced from the outer circumference of the furnace body 1 in the inner and outer directions to form a flue. The shell 3 has a smoke inlet 31 and a smoke outlet 32. The smoke inlet 31 and the smoke outlet 32 are both connected to the flue. The smoke inlet 31 is used to allow smoke to flow into the flue so that the smoke can pass through the flue to the material in the furnace body 1. Specifically, Figure 1 As shown, the shell 3 is sleeved on the outer peripheral side of the furnace body 1, and the outer peripheral surface of the furnace body 1 and the inner peripheral surface of the shell 3 are spaced apart to form a flue. The flue gas flows into the flue through the smoke inlet 31 and flows out through the smoke outlet 32, so that the flue gas heats the furnace body 1 to pyrolyze the material.

[0028] The second spiral blade 4 is provided in the flue, and the second spiral blade 4 spirally extends from top to bottom along the circumference of the furnace body 1 around the outer peripheral surface of the furnace body 1, so that the flue gas flows in the flue through the second spiral blade 4. Specifically, Figure 1 and Figure 2As shown, the second spiral blade 4 is provided on the outer peripheral surface of the furnace body 1 and is located in the flue. The second spiral blade 4 is spirally arranged in the up and down direction, and the rotation direction of the first spiral blade 2 is opposite to the rotation direction of the second spiral blade 4. For example, the first spiral blade 2 rotates clockwise from top to bottom, and the second spiral blade 4 rotates counterclockwise from top to bottom, or the first spiral blade 2 rotates counterclockwise from top to bottom, and the second spiral blade 4 rotates clockwise from top to bottom. As a result, the flue gas flows in a spiral in the flue through the second spiral blade 4, thereby extending the flow time of the flue gas in the flue, improving the heating efficiency of the flue gas, forcing the flue gas to flow along a preset path, and eliminating local dead zones.

[0029] The pyrolysis furnace 100 of the embodiment of the present invention is provided with a furnace body 1, a first spiral blade 2, a shell 3 and a second spiral blade 4. The first spiral blade 2 reduces the flow velocity of the material, prolongs the pyrolysis time of the material in the furnace body 1, and makes the material depyrolysis more sufficient. The second spiral blade 4 reduces the flow velocity of the flue gas in the flue, improves the heat exchange efficiency and thermal energy utilization rate of the flue gas. Compared with the related art, it effectively solves the problem of incomplete pyrolysis, ensures the adequacy of pyrolysis, and realizes more efficient utilization of thermal energy.

[0030] In some embodiments, the furnace body 1 includes a first section 11, a second section 12, and a third section 13. The first section 11 is located above the second section 12 and communicates with the second section 12. The third section 13 is located below the second section 12 and communicates with the second section 12. The feed port 15 and the gas outlet 17 are both located on the first section 11. The slag outlet 16 is located below the third section 13. The first spiral blade 2 is located in the second section 12. The shell 3 is sleeved on the outer circumference of the second section 12. Specifically, as Figure 1 As shown, the first section 11 is the feeding section, the second section 12 is the pyrolysis section, and the third end is the discharging section. The first section 11 is arranged at the upper end of the second section 12 and is connected to the second section 12. The third section 13 is arranged below the second section 12 and is connected to the second section 12. The feeding port 15 and the gas outlet 17 are formed at the top of the first section 11, which is conducive to the material flowing into the second section 12 for pyrolysis under the action of gravity. The slag outlet 16 is formed at the bottom of the third section 13, so that the material flows into the furnace body 1 through the top of the furnace body 1, and then after pyrolysis through the second section 12, the gas generated by the pyrolysis flows out of the furnace body 1 through the gas outlet 17, and the slag is discharged from the discharge port through the slag outlet 16. The first spiral blade 2 is arranged in the second section 12, and the shell 3 is sleeved on the outer circumferential surface of the second section 12. Therefore, the material can be pushed downward by the rotation of the first spiral blade 2 in the second section 12, and the pyrolysis process can be sufficient and uniform, thereby improving the pyrolysis efficiency.

[0031] In some embodiments, the inner circumference of the first section 11 is spherical. This facilitates more uniform distribution and flow of material within the feed section. Compared to flat or right-angled designs, the spherical surface reduces material accumulation in corners or edges, promoting uniform material flow across the entire cross-section. Furthermore, the spherical inner circumference reduces the contact area between the material and the inner wall of the furnace body 1, thereby reducing friction and wear, facilitating smooth material flow, and extending the service life of the furnace body 1.

[0032] In some embodiments, the housing 3 is cylindrical, and the ratio of the inner diameter of the first section 11 to the inner diameter of the housing 3 is 1:1.2. This balances the flow resistance and heat exchange area of the flue gas in the flue, ensuring sufficient heat exchange between the flue gas and the furnace body 1. This helps improve the thermal efficiency of the pyrolysis furnace 100, ensuring that the material is fully heated during the pyrolysis process, thereby increasing the speed and efficiency of the pyrolysis reaction.

[0033] In some embodiments, the cross-sectional area of the inner circumference of the third section 13 gradually decreases from top to bottom, and in a projection plane orthogonal to the inner and outer directions, the inner circumference of the third section 13 intersects the upper and lower directions at an angle of 50°-70°. Figure 1 As shown, the inner circumference of the third section 13 is a truncated cone with a larger upper end and a smaller lower end, and the discharge port is formed at the bottom of the third section 13. Thus, a gradually shrinking channel is formed through the third section 13, and the slag can flow naturally under the action of gravity, reducing the risk of blockage. This helps to ensure that the pyrolysis furnace 100 can operate continuously and stably, and improve the overall work efficiency. The cone angle of the third section 13 can be any one of 50°, 55°, 60°, 65°, and 70°. When the cone angle is greater than 70°, the slag discharge speed is too fast, increasing the impact on the slag discharge port 16. When the cone angle is less than 50°, it will affect the discharge efficiency of the slag. Therefore, setting the cone angle range to 50°-70° can ensure the smooth discharge of the slag while maintaining the stability and durability of the furnace body 1 structure.

[0034] In some embodiments, the shell 3 is made of Q345R. Q345R is a low-alloy, high-strength structural steel with excellent weldability and heat resistance. As the outer structure of the pyrolysis furnace 100, the Q345R material can withstand high pressures and temperatures, ensuring the service life of the shell 3.

[0035] In some embodiments, the furnace body 1 is made of Hastelloy or titanium alloy, and the inner circumference of the third end is coated with a silicon carbide coating. As the core component of the pyrolysis furnace 100, the furnace body 1 is directly exposed to the high temperature environment and corrosive gases of the pyrolysis reaction. Therefore, the Hastelloy and titanium alloy materials of the furnace body 1 provide the furnace body 1 with excellent high-temperature strength and corrosion resistance, capable of withstanding the high temperatures and corrosive gases generated during the pyrolysis process, ensuring stable operation and longevity of the furnace body 1 in harsh environments such as high temperatures and corrosion.

[0036] In some embodiments, the thickness of the furnace body 1 is not less than 3 mm. Since the furnace body 1 needs to withstand the pressure generated by the internal pyrolysis reaction and the load that may be applied from the outside, the minimum thickness of 3 mm ensures that the furnace body 1 can maintain stable structural performance under various working conditions, making the configuration of the furnace body 1 more reasonable.

[0037] In some embodiments, the pitch of the first spiral blade 2 is 300 mm to 500 mm. Specifically, Figure 1 As shown, the first spiral blade 2 is disposed within the second section 12 of the pyrolysis furnace 100, with a pitch ranging from 300 mm to 500 mm. This ensures smooth material flow under the propulsion of the spiral blade, preventing accumulation or blockage within the pyrolysis section. Furthermore, it prolongs the residence time of the material within the second section 12, ensuring a more complete pyrolysis reaction and thus improving pyrolysis efficiency.

[0038] In some embodiments, the pitch of the second spiral blade 4 is 400 mm to 600 mm. Specifically, the second spiral blade 4 is disposed within the flue of the pyrolysis furnace 100, and its pitch ranges from 400 mm to 600 mm. This ensures smooth flue gas flow under the propulsion of the spiral blade, prolonging the flue gas's residence time within the flue and improving the flue gas's heating efficiency. Furthermore, it reduces friction and wear between the flue gas and the spiral blade, extending the service life of the second spiral blade 4.

[0039] In some embodiments, the smoke inlet 31 is disposed adjacent to the bottom of the furnace body 1, and the smoke outlet 32 is disposed adjacent to the top of the housing 3. Figure 1As shown, the smoke inlet 31 is provided at the bottom of the shell 3, and the smoke outlet 32 is provided at the top of the shell 3. The smoke inlet 31 and the smoke outlet 32 are spaced relative to each other in the inner and outer directions, which can fully utilize the natural upward trend of the smoke. The smoke flows naturally in the pyrolysis furnace 100, without the need for additional power equipment, forming a reasonable smoke flow path, improving the flow efficiency of the smoke, and thus enhancing the heating effect of the material in the furnace body 1. The smoke flows from bottom to top, and the material flows from top to bottom, so that the smoke and the material exchange heat in reverse. During the flow process, the smoke will exchange heat with the material at different pyrolysis stages, achieving precise control of the pyrolysis process, ensuring that the material is evenly heated during the pyrolysis process, and avoiding the occurrence of local overheating or supercooling, thereby improving the quality and yield of the pyrolysis product.

[0040] In some embodiments, the pyrolysis furnace 100 further includes a pulse soot blower (not shown in the figure), which is connected to the smoke inlet 31 so that the pulse soot blower can clean the flue, and the operating frequency of the pulse soot blower is 0.2Hz-1Hz. Specifically, the pulse soot blower is arranged outside the furnace body 1 and the inlet of the pulse soot blower is connected to the smoke inlet 31. When the flue gas flows in the flue, it will fully exchange heat with the inner wall of the flue. If there is ash accumulation in the flue, the efficiency of heat exchange will be reduced. By using a pulse soot blower to clean the ash accumulation in the flue, it can ensure that the flue gas is in full contact with the inner wall of the flue, thereby improving the heat exchange efficiency.

[0041] In some embodiments, the pyrolysis furnace 100 further includes a waste heat recovery assembly (not shown). The preheat recovery assembly is connected to the smoke outlet 32 so that the waste heat recovery assembly can recover waste heat from the flue gas flowing out of the smoke outlet 32. Since the flue gas carries a large amount of heat when flowing out of the smoke outlet 32 during the pyrolysis process, the waste heat recovery assembly can recover the waste heat in the flue gas, thereby reducing the operating costs of the pyrolysis furnace 100.

[0042] In some embodiments, the feed port 15 includes a first port (not shown) and a second port (not shown). The first port and the second port are both located at the top of the furnace body 1 and communicate with the chamber 14. The first port and the second port are symmetrically spaced apart in the vertical direction. Specifically, the first port and the second port are both located at the top of the furnace body 1 and spaced apart in the inner and outer directions, which helps to achieve uniform feeding of the material, prevents biased flow or accumulation of the material during the feeding process, ensures uniform distribution of the material within the chamber 14, and improves pyrolysis efficiency.

[0043] The structure of the pyrolysis furnace 100 of the present invention is described in detail below. The pyrolysis furnace 100 is specially designed for highly corrosive denitrifying agents such as ammonium carbamate. The first section 11 adopts a dome-shaped structure. Two feed ports 15 (diameter 200mm) and a pyrolysis gas outlet (diameter 300mm) are symmetrically arranged on the top of the first section 11. The curvature radius of the first section 11 and the diameter ratio of the second section 12 are 1:1.2, ensuring uniform dispersion of the material and reducing airflow short-circuiting. The shell 3 is a pressure-resistant shell 3 (material Q345R), and the inner layer is a corrosion-resistant Hastelloy C276 lining (thickness 3mm). An annular flue gas channel (width 80mm) is formed between the shell 3 and the second section 12. The inner wall of the second section 12 is welded with a continuous spiral first spiral blade 2 (the height of the first spiral blade 2 is 50mm, the pitch is 300mm, and the inclination angle is 45°). The length of the first spiral blade 2 is designed according to the material reaction time requirement (total length is 5m-8m), so that the denitrification agent particles fall freely along the spiral path under the action of gravity, and the residence time is extended to 15-25 seconds. A reverse second spiral blade 4 (pitch 400mm) is synchronously set in the flue, forcing the high-temperature flue gas (500℃-600℃) to flow from bottom to top in a spiral path, exchanging heat with the material in the reverse direction, increasing the flue gas residence time to 8-12 seconds, and improving the thermal efficiency to more than 85%. The third end is located below the second section 12, with a cone angle of 60°, and the inner wall is sprayed with a silicon carbide wear-resistant coating. The slag outlet 16 at the third end is equipped with a pneumatic slag discharge valve (diameter 150mm). The lower portion of the shell 3 is equipped with a smoke inlet 31 (250mm diameter) and a pulsed soot blower (frequency 0.5Hz). The upper portion of the shell 3 is equipped with a smoke outlet 32 (300mm diameter) and is connected to the waste heat recovery system. The entire structure is connected by flanges, and the sealing surface uses a graphite spiral wound gasket with a temperature resistance of 600°C and a pressure resistance of 1.6MPa.

[0044] The pyrolysis furnace 100 of the present invention significantly improves the efficiency and economics of denitrification. The design of the first spiral blade 2 extends the material residence time to 2-3 times that of conventional furnaces, achieving an ammonium carbamate decomposition rate of ≥98% and a residue solids content of ≤2% (compared to ≥8% for conventional furnaces).

[0045] The flue and second spiral blades (4) improve heat exchange uniformity, keeping the temperature difference within the furnace within ±10°C, achieving a thermal energy utilization rate of 88%, and reducing fuel consumption by 15% to 20% year-on-year. For corrosive media, the combination of Hastelloy lining and silicon carbide coating extends the equipment life to over 8 years, reducing maintenance intervals from 3 months to 1 year.

[0046] The application of pulse sootblowers and a wear-resistant coating on the cone section effectively eliminates the clogging problem of traditional furnace slag outlets, enabling continuous operation for ≥5,000 hours without downtime for cleaning. Furthermore, the modular design supports parallel expansion of 14 chambers, adapting to processing scales of 50 to 500 kg / h, reducing overall operation and maintenance costs by 30%.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0050] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0051] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0052] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A pyrolysis furnace, characterized in that: include: a furnace body, the furnace body comprising a chamber, a feed port, a slag outlet, and a gas outlet, the feed port, the slag outlet, and the gas outlet all being in communication with the chamber, the feed port being adapted to admit material so that the material is heated in the chamber, the slag outlet being adapted to discharge slag after pyrolysis in the chamber, and the gas outlet being adapted to discharge gas in the chamber; a first spiral blade disposed in the chamber and spirally extending from top to bottom along the circumference of the furnace body so that the material flows in the chamber through the first spiral blade; a shell, the shell being sleeved outside the furnace body, and the inner circumference of the shell being spaced apart from the outer circumference of the furnace body in an inner-outer direction to form a flue, the shell having a smoke inlet and a smoke outlet, the smoke inlet and the smoke outlet both being in communication with the flue, the smoke inlet being used to introduce smoke so that the smoke flows into the flue and the smoke passes through the flue to irritate the material in the furnace body; The second spiral blade is provided in the flue and spirally extends from top to bottom along the circumference of the furnace body around the outer circumference of the furnace body so that the flue gas flows in the flue through the second spiral blade.

2. The pyrolysis furnace according to claim 1, characterized in that The furnace body includes a first section, a second section and a third section. The first section is arranged above the second section and is connected to the second section. The third section is arranged below the second section and is connected to the second section. The feed port and the gas outlet are both arranged on the first section. The slag outlet is arranged below the third section. The first spiral blade is arranged in the second section. The shell is sleeved on the outer circumferential surface of the second section.

3. The pyrolysis furnace according to claim 2, characterized in that The inner circumference of the first section is spherical, the shell is cylindrical, and the ratio of the diameter of the inner circumference of the first section to the diameter of the inner circumference of the shell is 1:1.

2.

4. The pyrolysis furnace according to claim 2, characterized in that The cross-sectional area of the inner circumference of the third section gradually decreases from top to bottom. In the projection plane perpendicular to the inner and outer directions, the inner circumference of the third section intersects the upper and lower directions at an angle of 50°-70°.

5. The pyrolysis furnace according to claim 2, characterized in that The shell is made of Q345R, the furnace body is made of Hastelloy or titanium alloy, and the thickness of the furnace body is not less than 3 mm. The inner circumference of the third end is coated with a silicon carbide coating.

6. The pyrolysis furnace according to claim 1, characterized in that The pitch of the first spiral blade is 300mm-500mm, and the pitch of the second spiral blade is 400mm-600mm.

7. The pyrolysis furnace according to claim 1, characterized in that The smoke inlet is arranged adjacent to the bottom of the furnace body, and the smoke outlet is arranged adjacent to the top of the shell.

8. The pyrolysis furnace according to claim 1, characterized in that It also includes a pulse soot blower, which is connected to the smoke inlet so that the pulse soot blower can clean the flue, and the operating frequency of the pulse soot blower is 0.2Hz-1Hz.

9. The pyrolysis furnace according to claim 1, characterized in that It also includes a waste heat recovery component, and the preheat recovery component is connected to the smoke outlet so that the waste heat recovery component recovers the waste heat of the smoke flowing out of the smoke outlet.

10. The pyrolysis furnace according to claim 1, characterized in that The feed port includes a first port and a second port, the first port and the second port are both arranged on the top of the furnace body and communicated with the chamber, and the first port and the second port are symmetrically arranged in the up and down directions.

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