Hydrothermal pyrolysis unit with bottom heating

Abstract

The application provides a hydrothermal cracking device with bottom heating, which comprises a vertical tank, a first heating assembly and a steam blowing assembly. The bottom of the vertical tank is an elliptical head, the top of the vertical tank is provided with a feeding port, and the bottom of the vertical tank is provided with a discharging port. The first heating assembly is arranged in the bottom head of the vertical tank and has a heating space in the shape of an inverted truncated pyramid. The heating space is connected to the vertical tank through a top inlet and connected to the discharging port through a bottom outlet. The size of the inlet is larger than that of the outlet. The top edge and the bottom edge of the first heating assembly are respectively connected to the inner wall of the vertical tank in a sealing mode. The steam blowing assembly has a plurality of steam outlets, each of which is located in the heating space and faces the inner wall of the heating space. The application solves the problem of dead zones in the cracking tank in the prior art by arranging the first heating assembly in the vertical tank, so that the hydrothermal cracking of the material can be fully realized.

Description

Technical Field

[0001] This invention relates to the field of agricultural and forestry waste treatment devices, and more particularly to a hydrothermal pyrolysis device with bottom heating. Background Technology

[0002] Compared to biological fermentation, hydrothermal pyrolysis is a superior method for treating agricultural solid waste. It can completely kill bacteria, viruses, and insect eggs, thoroughly decompose toxic and harmful substances such as antibiotics and hormones, and is safe, stable, and does not burn seedlings. At the same time, it retains a large amount of carbon and nitrogen components, forming high-quality, pure organic, and fully nutritious small-molecule organic solid and liquid fertilizers.

[0003] Most existing technologies employ heating coils within vertical tanks. For example, patent CN110240496A discloses a liquid organic fertilizer production equipment and method, which uses coils and agitators inside the tank to achieve sufficient in-tank pyrolysis. However, the area near the bottom end cap remains a dead zone for the pyrolysis reaction. Materials in this area rarely undergo hydrothermal pyrolysis, resulting in incomplete reaction and affecting product quality. These problems urgently need to be addressed. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention provides a hydrothermal pyrolysis device with bottom heating, comprising a vertical tank, a first heating component, and a steam blowing component; the bottom of the vertical tank is an elliptical head, with a feed inlet at the top and a discharge outlet at the bottom; the first heating component is disposed within the bottom head of the vertical tank and has an inverted frustum-shaped heating space inside, the heating space being connected to the interior of the vertical tank through a top inlet and to the discharge outlet through a bottom outlet; the size of the inlet is larger than the outlet; the top edge and bottom edge of the first heating component are respectively sealed to the inner wall of the vertical tank; the steam blowing component has multiple steam outlets, each of which is located within the heating space and faces the inner wall of the heating space.

[0005] In the hydrothermal pyrolysis device with bottom heating of the present invention, the first heating component includes a first annular main pipe, a first heating branch pipe, a second annular main pipe, and a sealing plate; the first annular main pipe and the second annular main pipe are arranged parallel to each other in the vertical direction, and the heating medium is input or output through the first annular main pipe and / or the second annular main pipe; there are multiple first heating branch pipes, and both ends of each first heating branch pipe are respectively connected to the first annular main pipe and the second annular main pipe; the sealing plate is disposed in the area enclosed by the first heating branch pipe, the first annular main pipe, and the second annular main pipe, and is sealed to the first heating branch pipe, the first annular main pipe, and the second annular main pipe.

[0006] In the hydrothermal pyrolysis device with bottom heating of the present invention, the first annular main pipe is on top, and its interior is divided into an independent first section and a second section by a first partition; the heating medium flows in from the first section and then flows through the first heating branch pipe, the second annular main pipe, and the first heating branch pipe in sequence before flowing into the second section and being output.

[0007] In the hydrothermal pyrolysis device with bottom heating of the present invention, the first annular main pipe, the first heating branch pipe and the second annular main pipe form an inverted truncated pyramid frame, and the first heating branch pipe is vertically connected to the first annular main pipe and the second annular main pipe.

[0008] In the hydrothermal pyrolysis device with bottom heating of the present invention, the heating space is an inverted truncated pyramidal structure; the inner wall of the heating space is respectively provided with the steam outlet of the steam blowing assembly.

[0009] In the hydrothermal pyrolysis apparatus with bottom heating of the present invention, the steam outlet of the steam blowing assembly is oriented perpendicular to the axis of the vertical tank and directly facing the inner wall of the heating space.

[0010] In the hydrothermal pyrolysis device with bottom heating of the present invention, the hydrothermal pyrolysis device with bottom heating further includes a second heating component; the second heating component is located above the first heating component and is used to heat the space of the vertical tank's straight section, and includes a third annular main pipe, a second heating branch pipe, a fourth annular main pipe, and a second partition; the third annular main pipe and the fourth annular main pipe are arranged parallel to each other in the vertical direction, with the third annular main pipe on top; the fourth annular main pipe is divided into an independent third section and a fourth section by the second partition; there are multiple second heating branch pipes, and both ends of each second heating branch pipe are respectively connected to the third annular main pipe and the fourth annular main pipe; the heating medium flows in from the third section and then sequentially passes through the second heating branch pipe, the third annular main pipe, and the second heating branch pipe before being input into the fourth section and output.

[0011] In the hydrothermal pyrolysis device with bottom heating of the present invention, the fourth annular main pipe is a circular ring, the second annular main pipe is a square ring, and the second annular main pipe is connected to the fourth annular main pipe; the edge of the second annular main pipe is sealed to the inner wall of the vertical tank through a sealing plate, and the sealing plate is perpendicular to the inner wall of the vertical tank.

[0012] In the hydrothermal pyrolysis device with bottom heating of the present invention, the third annular main pipe and the fourth annular main pipe are the same shape and are arranged opposite each other, and the two ends of the second heating branch pipe are respectively vertically connected to the third annular main pipe and the fourth annular main pipe.

[0013] In the hydrothermal pyrolysis apparatus with bottom heating of the present invention, the hydrothermal pyrolysis apparatus with bottom heating further includes a jacket; the jacket is disposed in the straight section of the vertical tank.

[0014] In the hydrothermal pyrolysis device with bottom heating of the present invention, the internal space of the jacket forms a spiral flow channel through a third partition; the feed inlet of the spiral flow channel is at the bottom and the discharge outlet is at the top.

[0015] In the hydrothermal pyrolysis apparatus with bottom heating of the present invention, the surface of the vertical tank is provided with a heat insulation layer.

[0016] In the hydrothermal pyrolysis device with bottom heating of the present invention, the steam blowing assembly includes a steam blowing pipe, a valve and a steam header; there are multiple steam blowing pipes, one end of each steam blowing pipe extends into the heating space to form a steam outlet, and the other end is connected to the steam header; the valve is respectively provided on each steam blowing pipe.

[0017] The beneficial effects of the present invention are as follows: The hydrothermal pyrolysis device with bottom heating of the present invention solves the problem of dead zones in the pyrolysis tank of the prior art, which leads to insufficient pyrolysis, by setting a first heating component in the vertical tank, and can achieve the effect of fully hydrothermal pyrolysis of materials; and based on the setting of steam blowing component and inverted truncated pyramid-shaped heating space, the materials in the vertical tank are fully stirred, resulting in uniform heating, further improving the efficiency of hydrothermal pyrolysis, reducing the hydrothermal pyrolysis reaction time, increasing output, and reducing costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the hydrothermal pyrolysis device with bottom heating according to the present invention;

[0019] Figure 2 This is a schematic diagram of the installation state of the first heating component and the fourth annular main pipe of the hydrothermal pyrolysis device with bottom heating of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the second heating component of the hydrothermal pyrolysis device with bottom heating according to the present invention.

[0021] Legend: 1. Vertical tank; 11. Inlet; 12. Outlet; 2. First heating assembly; 21. Heating space; 22. First annular main pipe; 221. First section; 222. Second section; 23. First heating branch pipe; 24. Second annular main pipe; 25. Sealing plate; 26. First partition; 3. Second heating assembly; 31. Third annular main pipe; 32. Second heating branch pipe; 33. Fourth annular main pipe; 331. Third section; 332. Fourth section; 34. Second partition; 4. Steam blowing assembly; 41. Steam blowing pipe; 42. Valve; 43. Steam header; 5. Jacket; 6. Third partition. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] A hydrothermal pyrolysis apparatus with bottom heating according to the present invention will now be described in detail with reference to the accompanying drawings.

[0026] like Figure 1As shown, a hydrothermal pyrolysis device with bottom heating includes a vertical tank 1 (preferably with an external insulation layer), a first heating component 2, and a steam blowing component 4. The bottom of the vertical tank 1 is an elliptical head, and a feed inlet 11 is provided at the top, while a discharge outlet 12 is provided at the bottom. The first heating component 2 is disposed inside the bottom head of the vertical tank 1 and has an inverted frustum-shaped heating space 21 inside. The heating space 21 is connected to the inside of the vertical tank 1 through the top inlet and to the discharge outlet 12 through the bottom outlet. Preferably, the size of the bottom outlet is equal to or slightly larger than the discharge outlet 12, and the edge of the bottom outlet is flush with the inner wall of the vertical tank 1. The inlet is larger than the outlet. Preferably, the top and bottom surfaces of the truncated pyramid structure are open structures, with the top opening being the top inlet and the bottom opening being the bottom outlet, thereby increasing the inlet and outlet area and facilitating material flow. The top and bottom edges of the first heating component 2 are sealed to the inner wall of the vertical tank 1, thereby forming a cavity between the first heating component 2 and the bottom end cap of the vertical tank 1. The cavity is drained through a drain valve, and an exhaust port is provided on the vertical tank 1. The steam blowing component 4 has multiple steam outlets, each of which is located in the heating space 21 and faces the inner wall of the heating space 21.

[0027] The hydrothermal pyrolysis device with bottom heating of the present invention solves the problem of dead zones in the pyrolysis tank of the prior art, which leads to incomplete pyrolysis, by setting a first heating component in the vertical tank. It can achieve the effect of sufficient hydrothermal pyrolysis of materials (the degree of pyrolysis can be judged by whether there is an off-odor when the hydrothermal pyrolysis product is fermented in the second stage). Moreover, based on the setting of steam blowing component and inverted truncated pyramid-shaped heating space, the materials in the vertical tank are fully stirred, resulting in uniform heating, further improving the efficiency of hydrothermal pyrolysis, reducing the hydrothermal pyrolysis reaction time, increasing output, and reducing costs.

[0028] In some embodiments, such as Figure 1 and 2As shown, the first heating assembly 2 includes a first annular main pipe 22, a first heating branch pipe 23, a second annular main pipe 24, and a sealing plate 25 (the first annular main pipe 22, the first heating branch pipe 23, the second annular main pipe 24, and the sealing plate 25 form a heating space 21); the first annular main pipe 22 and the second annular main pipe 24 are arranged parallel to each other in the vertical direction (perpendicular to the axis of the vertical tank 1), and the heating medium is input or output through the first annular main pipe 22 and / or the second annular main pipe 24, that is, both are in the first annular main pipe or the second annular main pipe 24. The material flows in and out through two annular main pipes, or flows in through either the first or second annular main pipe and out through either the second or first annular main pipe. Multiple first heating branch pipes 23 are present, each connected at both ends to the first annular main pipe 22 and the second annular main pipe 24. A sealing plate 25 is disposed within the area enclosed by the first heating branch pipes 23, the first annular main pipe 22, and the second annular main pipe 24, and is sealed to them. Based on the above scheme, the first heating assembly 2 can avoid the generation of heating dead zones, ensuring complete pyrolysis, and allowing the material to directly contact the heating pipes for higher heat transfer efficiency.

[0029] Preferably, the first annular main pipe 22 is at the top, and its interior is divided into an independent first section 221 and a second section 222 by a first partition 26 (using two first partitions 26, preferably dividing the first annular main pipe 22 into two equal parts); the heating medium flows in from the first section 221 and then flows sequentially through the first heating branch pipe 23, the second annular main pipe 24, and the first heating branch pipe 23 before flowing into the second section 222 and being output; the first section 221 is provided with a feed pipe, and the second section 222 is provided with a discharge pipe. At this time, the first annular main pipe 22 forms a top inlet; the second annular main pipe 24 forms a bottom outlet; based on this flow mode of the heating medium, the heating temperature of the material in the heating space is more uniform, ensuring the consistency of the hydrothermal pyrolysis reaction.

[0030] In a further preferred embodiment, the first annular main pipe 22, the first heating branch pipe 23, and the second annular main pipe 24 form an inverted quadrangular truncated frame. The first heating branch pipe 23 is vertically connected to the first annular main pipe 22 and the second annular main pipe 24. This structure allows for the arrangement of more first heating branch pipes 23 to increase the heat transfer area and thus improve the material handling efficiency.

[0031] In some embodiments, the heating space 21 has an inverted quadrangular frustum structure; the inner wall of the heating space 21 is provided with steam outlets of the steam blowing assembly 4, that is, four steam outlets are provided. The four steam outlets are evenly distributed around the axis of the vertical tank 1, and preferably located at the center of the side of the frustum; the inverted quadrangular frustum structure is easier to manufacture.

[0032] In some embodiments, the steam outlet of the steam blowing assembly 4 is oriented perpendicular to the axis of the vertical tank 1 and faces the inner wall of the heating space 21; based on the vertical axis blowing, the maximum blowing range can be obtained, thereby obtaining the maximum disturbance effect.

[0033] In some embodiments, such as Figure 1 , 2 As shown in Figure 3, the hydrothermal pyrolysis device with bottom heating also includes a second heating component 3; the second heating component 3 is located above the first heating component 2 and is used to heat the straight section of the vertical tank 1 (preferably, the height of the second heating component 3 is equal to the height of the straight section of the vertical tank 1), and includes a third annular main pipe 31, a second heating branch pipe 32, a fourth annular main pipe 33, and a second partition plate 34; the third annular main pipe 31 and the fourth annular main pipe 33 are arranged parallel to each other in the vertical direction (perpendicular to the axis of the vertical tank 1), with the third annular main pipe 31 on top; the fourth annular main pipe 33 passes through the second The baffle 34 is divided into an independent third section 331 and a fourth section 332 (specifically, two second baffles 34 are used to divide the fourth annular main pipe 33 equally); there are multiple second heating branch pipes 32, and the two ends of each second heating branch pipe 32 are connected to the third annular main pipe 31 and the fourth annular main pipe 33 respectively; the heating medium flows in from the third section 331 and then passes through the second heating branch pipe 32, the third annular main pipe 31, and the second heating branch pipe 32 in sequence before being input into the fourth section 332 and output; based on this flow mode, the heating of the material in the tank is more uniform, thereby making the degree of hydrothermal pyrolysis in the tank consistent.

[0034] Specifically, the fourth annular main pipe 33 is a circular ring, and the first annular main pipe 22 is a square ring. The first annular main pipe 22 is connected to the fourth annular main pipe 33. The edge of the first annular main pipe 22 is sealed to the inner wall of the vertical tank 1 through a sealing plate, and the sealing plate is perpendicular to the inner wall of the vertical tank 1. The first annular main pipe 22 and the fourth annular main pipe 33 share a common heat medium inlet and outlet pipe to connect to the external heat source.

[0035] Preferably, the third annular main pipe 31 and the fourth annular main pipe 33 are identical in shape and arranged vertically opposite each other, and the two ends of the second heating branch pipe 32 are vertically connected to the third annular main pipe 31 and the fourth annular main pipe 33, respectively. Based on this arrangement, on the one hand, the vertical arrangement of the second heating branch pipe 32 avoids creating dead zones that affect the hydrothermal decomposition effect; on the other hand, the vertical arrangement allows for the arrangement of more second heating branch pipes 32, which is beneficial to increasing the heat transfer area and improving the hydrothermal decomposition efficiency.

[0036] In some embodiments, the hydrothermal pyrolysis apparatus with bottom heating further includes a jacket 5; the jacket 5 is disposed in the straight section of the vertical tank 1.

[0037] Preferably, the internal space of the jacket 5 forms a spiral flow channel through the third partition 6; the feed inlet of the spiral flow channel is at the bottom and the discharge outlet is at the top; based on the spiral flow of the heating medium, the material near the inner wall of the vertical tank 1 is heated more completely, and the cross-section based on the spiral flow is reduced, which increases the flow velocity and is conducive to heat transfer.

[0038] In some embodiments, such as Figure 1 As shown, the steam blowing assembly 4 includes steam blowing pipes 41, valves 42, and a steam header 43. There are multiple steam blowing pipes 41, with one end extending into the heating space 21 to form a steam outlet (the steam blowing pipes 41 extend from the bottom end cap of the vertical tank 1 and are perpendicular to the end cap of the vertical tank 1), and the other end connecting to the steam header 43. Each steam blowing pipe 41 is equipped with a valve 42. Preferably, the steam blowing pipe 41 is provided with an expansion bend. Specifically, the valves 42 are controlled according to the actual material conditions to adjust the steam blowing pressure and frequency, achieving uniform temperature inside the tank and ensuring sufficient hydrothermal pyrolysis reaction.

Claims

1. A hydrothermal pyrolysis apparatus with bottom heating, characterized by, It comprises a vertical tank (1), a first heating assembly (2) and a steam blowing assembly (4); The bottom of the vertical tank (1) is an oval head, and the top is provided with a feeding port (11), and the bottom is provided with a discharging port (12); The first heating assembly (2) is arranged in the bottom head of the vertical tank (1), and has an inverted trapezoidal heating space (21) inside, which is communicated with the vertical tank (1) through a top inlet and communicated with the discharging port (12) through a bottom outlet; the size of the inlet is larger than that of the outlet; The top edge and the bottom edge of the first heating assembly (2) are respectively sealedly connected with the inner wall of the vertical tank (1); The steam blowing assembly (4) has a plurality of steam outlets, each of which is located in the heating space (21) and faces the inner wall of the heating space (21); the first heating assembly (2) comprises a first annular main pipe (22), a first heating branch pipe (23), a second annular main pipe (24) and a sealing plate (25); The first annular main pipe (22) and the second annular main pipe (24) are arranged in parallel along the vertical direction, and the heating medium is inputted or outputted from the first annular main pipe (22) and / or the second annular main pipe (24); The first heating branch pipe (23) is a plurality in number, and the two ends of each first heating branch pipe (23) are respectively communicated with the first annular main pipe (22) and the second annular main pipe (24); The sealing plate (25) is arranged in the area surrounded by the first heating branch pipe (23), the first annular main pipe (22) and the second annular main pipe (24), and is sealingly connected with the first heating branch pipe (23), the first annular main pipe (22) and the second annular main pipe (24); the first annular main pipe (22) is on the top, and the inside is divided into independent first segment (221) and second segment (222) by first partition (26); The heating medium flows into the first segment (221) and then flows into the second segment (222) through the first heating branch pipe (23), the second annular main pipe (24) and the first heating branch pipe (23) in sequence and then is outputted.

2. The bottom heated hydrothermal pyrolysis apparatus of claim 1, wherein, The steam outlet of the steam blowing assembly (4) faces vertically to the axis of the vertical tank (1) and directly faces the inner wall of the heating space (21).

3. The bottom heated hydrothermal pyrolysis apparatus of claim 1, wherein, The water heat cracking device with bottom heating further comprises a second heating assembly (3); The second heating assembly (3) is located above the first heating assembly (2) and is used for heating the straight section space of the vertical tank (1), and comprises a third annular main pipe (31), a second heating branch pipe (32), a fourth annular main pipe (33) and a second partition (34); The third annular main pipe (31) and the fourth annular main pipe (33) are arranged in parallel along the vertical direction, and the third annular main pipe (31) is on the top; The fourth annular main pipe (33) is divided into independent third segment (331) and fourth segment (332) by the second partition (34); The second heating branch pipes (32) are multiple in number, and each of the second heating branch pipes (32) is communicated at two ends to the third annular main pipe (31) and the fourth annular main pipe (33) respectively; The heating medium flows into the third section (331), then sequentially passes through the second heating branch pipe (32), the third annular main pipe (31), the second heating branch pipe (32), and then is input to the fourth section (332) and is output.

4. The bottom heated hydrothermal pyrolysis apparatus of claim 1, wherein, The water thermal cracking device with bottom heating further comprises a jacket (5); The jacket (5) is arranged on a straight section of the vertical tank (1).

5. The bottom heated hydrothermal pyrolysis apparatus of claim 4, wherein, An internal space of the jacket (5) forms a spiral flow channel through a third partition plate (6), and a feeding port of the spiral flow channel is arranged at a lower position and a discharging port is arranged at an upper position.

6. The bottom heated hydrothermal pyrolysis apparatus of claim 1, wherein, A surface of the vertical tank (1) is provided with a heat preservation layer.

7. The bottom heated hydrothermal pyrolysis apparatus of claim 1, wherein, The steam blowing assembly (4) comprises steam blowing pipes (41), valves (42) and a steam header (43). The steam blowing pipes (41) are multiple in number, one end of each of the steam blowing pipes (41) extends into the heating space (21) to form a steam outlet, and the other end is communicated to the steam header (43). Each of the steam blowing pipes (41) is respectively provided with the valve (42).

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