WO2022165880A1 - Two-stage rotary furnace - Google Patents

Abstract

Disclosed in the present application is a two-stage rotary furnace. The two-stage rotary furnace comprises a drum, a furnace head device, a furnace tail device, a solid-phase conveying device, a follow-up jacket, a central discharging mechanism and a furnace-tail gas intake cylinder, wherein the drum rotates continuously in one direction, a discharge end thereof is closed, and the interior thereof is successively divided, from a feed end to the discharge end, into a drying section and a carbonization section which are independent from each other; two ends of the solid-phase conveying device are in communication with two process sections; the follow-up jacket is fixed on a drum wall of the drum; the carbonization section is an indirect heating section; the drying section is an indirect heating section and/or a direct heating section; the central discharging mechanism is fixed at the discharge end of the drum, is in communication with the carbonization section, is rotationally connected to the furnace tail device in a sealing manner, and is used for controlling the discharge of a pyrolysis gas and biological carbon in the carbonization section to the furnace tail device; and the furnace-tail gas intake cylinder is immovable and is rotationally connected to the drum wall at the discharge end of the drum in sealing manner, and is in communication with the follow-up jacket, and heated gas is introduced therein. By means of the two-stage rotary furnace, different processes of materials are completed in one rotary furnace, and a residence time of the materials is controlled.

Description

Two-stage rotary furnace

This application is required to be submitted to the China Patent Office on February 4, 2021, the application number is 202110155762.9, the name of the invention is "two-stage rotary kiln", and it is required to be submitted to the China Patent Office on February 4, 2021, the application number is 202120324098.1, practical The Chinese patent priority for the new type titled "two-stage rotary kiln", the entire contents of which are incorporated herein by reference.

technical field

The invention relates to the technical fields of environmental protection, energy and chemical equipment, in particular to a two-stage rotary furnace.

Background technique

The rotary kiln is a commonly used equipment in environmental protection, energy and chemical production. The existing rotary kiln is usually composed of a drum, a furnace head and a furnace tail. The two ends of the drum are statically and dynamically sealed, and the drum is continuously rotated in a single direction by an external driving device. The rotary kiln is an integral chamber due to the front and rear penetration of the drum, and the gas flows unhindered in the chamber, and there can only be one gas phase working condition; During rotation, the solid material inevitably tumbles to the lower end of the rotary furnace, and the residence time of the solid material in the drum cannot be effectively controlled.

When some materials are heated in a rotary kiln and require different gas phase conditions, different combinations of rotary kilns need to be used, and each rotary kiln corresponds to a process, which makes the material transfer between the rotary kilns complicated and complicated, and the materials are in different rotary kilns. It is easy to cause heat loss in the process of inter-transfer, which increases energy consumption.

To sum up, how to implement different processes of materials in the same rotary kiln and effectively control the residence time of solid materials in the drum has become an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a two-stage rotary kiln, so that different processes of materials can be carried out in the same rotary kiln, and the residence time of solid materials in the drum can be effectively controlled.

To achieve the above object, the present invention provides the following technical solutions:

A two-stage rotary kiln includes a drum, a furnace head device and a furnace tail device, the feeding end of the drum is connected in a rotational and sealing manner with the fixed furnace head device, and the drum can rotate continuously in the same direction , the interior of the drum is divided into two mutually independent process sections from the feed end to the discharge end by the segmented plate, which are respectively the drying section and the carbonization section. The two-stage rotary furnace also includes:

a solid-phase conveying device, the two ends of the solid-phase conveying device are respectively connected to the drying section and the carbonization section, and are used for solid material conveying between the two process sections;

A follow-up jacket, fixed on the cylinder wall of the drum, the inside of the follow-up jacket is used for feeding heating gas, the carbonization section is an indirect heating section, and the drying section is an indirect heating section and/or direct heating The indirect heating section heats the material through the partition wall of the follower jacket, and the direct heating section directly contacts the heating material by feeding heating gas;

A central discharge mechanism, the discharge end of the drum is closed and arranged, one end of the central discharge mechanism is coaxially fixed to the discharge end of the drum and communicated with the carbonization section, and the other end of the central discharge mechanism is One end is connected with the furnace tail device which is fixedly arranged in a rotating and sealing manner, and the central discharging mechanism is used to control the pyrolysis gas and biochar in the carbonization section to be discharged to the furnace tail device;

The furnace tail air intake tube is fixed and fixed, and the furnace tail air intake tube is rotatably and sealedly connected with the cylinder wall of the drum close to the discharge end, and the furnace tail air intake tube is provided with a hot gas inlet and a third The ash discharge port, the hot gas inlet is used for introducing heating gas, and the furnace tail air inlet is communicated with the follow-up jacket.

Preferably, in the above-mentioned two-stage rotary kiln, the furnace tail air intake duct is covered outside the discharge end of the drum, and the central discharge mechanism rotatably seals the distance passing through the furnace tail air intake duct. side of the feed end.

Preferably, in the above-mentioned two-stage rotary kiln, an air supply pipe and/or a ventilation pipe are arranged in the drum;

The air supply pipeline is connected with the furnace tail air inlet cylinder and the drying section, the follow-up jacket is connected with the air supply pipeline, and the heating gas is introduced into the drying section through the air supply pipeline for direct contact heating;

The ventilation pipe communicates with the follower jacket and the drying section, and heating gas is introduced into the drying section through the ventilation pipe for direct contact heating.

Preferably, in the above-mentioned two-stage rotary furnace, the air supply pipeline includes an air supply main pipe and an air supply branch pipe, the air supply branch pipe is communicated with the furnace tail air intake cylinder, and one end of the air supply main pipe is communicated with the air supply branch pipe, The other end of the air supply main pipe communicates with the drying section and/or the follower jacket, and the part of the air supply main pipe located in the drum has one pipe or a plurality of parallel pipes.

Preferably, in the above-mentioned two-stage rotary furnace, the central discharging mechanism is a central screw discharging mechanism or a central piston discharging mechanism, and a turning plate is fixed at the inlet of the central discharging mechanism, and the turning plate is fixed at the entrance of the central discharging mechanism. The material plate is extended and fixed on the inner wall of the drum;

The center screw discharge mechanism includes:

A central discharging cylinder, one end of the central discharging cylinder is fixed on the discharging end of the drum, and the other end is connected with the furnace tail kiln body in a rotational and sealing manner, and the central discharging cylinder is connected with the furnace tail air inlet cylinder. Rotary sealing connection;

a central screw, which is rotatably arranged on the central discharge cylinder;

The second power component is drivingly connected with the central screw, and is used for driving the central screw to rotate relative to the central discharge cylinder.

Preferably, in the above two-stage rotary furnace, the furnace tail device includes a furnace tail kiln body, the furnace tail kiln body is provided with a pyrolysis gas outlet and a discharge port, and the furnace tail kiln body is fixed. It is connected with the central discharging mechanism in a rotary and sealing manner.

Preferably, the above-mentioned two-stage rotary furnace further includes a hot blast stove, which is used for combustion to generate heating gas, and the hot blast stove is provided with a hot gas outlet, and the hot gas outlet is connected to the furnace through a hot gas conveying pipe. The hot gas inlet of the tail air intake is communicated.

Preferably, in the above two-stage rotary kiln, the pyrolysis gas outlet of the furnace tail kiln body is communicated with the hot blast furnace through a pyrolysis gas conveying pipe, which is used to transfer the pyrolysis gas in the furnace tail kiln body Pass into the hot blast stove to burn.

Preferably, in the above two-stage rotary kiln, the burner device includes:

The furnace head kiln body is provided with an exhaust chamber, and the exhaust chamber is provided with a first exhaust port and a first ash discharge port, and the furnace head kiln body is fixedly connected to the The feeding end of the drum is connected in a rotary and sealing manner, and the drying section is communicated with the exhaust chamber;

A feeding mechanism, the feeding mechanism is sealed through the furnace head kiln body and extends into the drum, and the feeding mechanism is provided with a feeding port.

Preferably, in the above two-stage rotary kiln, when a follower jacket is fixed on the cylinder wall of the drying section, both the follower jacket and the drying section communicate with the exhaust chamber.

Preferably, in the above-mentioned two-stage rotary kiln, the drum and the furnace head kiln body are communicated through a variable diameter section, and one of the feed end of the drum and the furnace head kiln body is connected to the other one. One end of the variable diameter section is fixedly connected, and the other of the feed end of the drum and the furnace head kiln body is connected with the other end of the variable diameter section in a rotary seal; the outer diameter of the variable diameter section is smaller than that of the drum the outer diameter of the remaining shaft segments.

Preferably, in the above-mentioned two-stage rotary kiln, the feed end of the drum or the furnace head kiln body is rotatably and sealedly matched with the cylindrical wall of the variable diameter section through a conical surface, and the conical surface and the A sealing gasket is arranged between the cylinder walls of the variable diameter section;

Alternatively, the feed end of the drum or the part of the furnace head kiln body that is used to rotate and cooperate with the variable diameter section is a vertical plane perpendicular to the axis of the variable diameter section, and the vertical plane is connected to the variable diameter section. The cylindrical wall of the diameter section is sealed by a seal.

Preferably, in the above two-stage rotary kiln, when a follower jacket is fixed on the cylinder wall of the drying section, the follower jacket and the drying section are connected to the The exhaust chamber communicates.

Preferably, in the above-mentioned two-stage rotary kiln, the solid-phase conveying device is a screw conveyor, and the screw conveyor is inserted into the drying section and the carbonization section obliquely and sequentially from the outside of the drum, And through the segmented plate, the material inlet of the screw conveyor is located in the drying section, and the material outlet of the screw conveyor is located in the carbonization section.

Preferably, in the above-mentioned two-stage rotary kiln, the screw conveyor includes a power part, a screw part and a cylinder, the screw part is arranged in the cylinder, and the screw part is drivingly connected with the power part , the material outlet of the screw conveyor is opened at the end of the cylinder body, and the cylinder body is not provided in the part of the screw conveyor located in the drying section.

Preferably, in the above-mentioned two-stage rotary kiln, the helical part is an intermittent helical or a continuous helical, and/or an end of the helical part close to the material outlet of the screw conveyor is connected with the cylinder. There is a distance between the ends.

Preferably, in the above-mentioned two-stage rotary kiln, a controller and a position switch are also included, and the power component and the position switch are both signally connected to the controller, and the position switch is arranged on the drum, and when the When the solid-phase conveying device is within the material accumulation range directly below the drum, the position switch is triggered, and the controller controls the operation of the power component, which drives the screw component to move.

Preferably, in the above two-stage rotary kiln, the position switch is any one or a combination of a photoelectric switch or a magnetic induction switch.

Preferably, in the above two-stage rotary kiln, the solid-phase conveying device is arranged outside the drum, and the inlet and outlet of the solid-phase conveying device are respectively connected with the drums of the drying section and the carbonization section. wall connection.

Preferably, in the above two-stage rotary kiln, the solid phase conveying device is a screw conveyor or a piston conveyor.

Preferably, in the above-mentioned two-stage rotary kiln, it further comprises an exhaust box in the furnace which is fixedly arranged, the drum passes through the exhaust box in the furnace, and the cylinder wall of the drying section is connected to the exhaust box in the furnace. The in-furnace exhaust box is connected in a rotary and sealed manner, the follow-up jacket communicates with the in-furnace exhaust box, and the in-furnace exhaust box is provided with a second exhaust port and a fourth ash exhaust port.

Preferably, in the above-mentioned two-stage rotary furnace, a position of the follower jacket close to the burner device is communicated with the furnace exhaust box.

Preferably, in the above-mentioned two-stage rotary furnace, the follower jacket is provided with a through hole communicating with the exhaust box in the furnace corresponding to the cylinder wall of the exhaust box in the furnace.

Compared with the prior art, the beneficial effects of the present invention are:

The invention provides a two-stage rotary furnace, comprising a drum, a furnace head device, a furnace tail device, a solid-phase conveying device, a follow-up jacket, a central discharge mechanism and a furnace tail air intake cylinder; wherein, the two ends of the drum are respectively For the feeding end and the discharging end, the feeding end of the drum is connected with the furnace head device which is fixed and fixed in rotation and sealing. The drum rotates continuously in the same direction. From the end to the discharge end, it is divided into independent process sections, which are the drying section and the carbonization section. ;The follower jacket is fixed on the cylinder wall of the drum, the heating gas is introduced into the follower jacket, the carbonization section is an indirect heating section, the drying section is an indirect heating section and/or a direct heating section, and the indirect heating section is driven by the follower The wall of the jacket heats the material, and the direct heating section directly contacts the heating material through the introduction of heating gas; one end of the central discharge mechanism is coaxially fixed to the discharge end of the drum and communicates with the carbonization section, and the other end of the central discharge mechanism is not fixed. The dynamically installed furnace tail device is connected and connected in a rotary seal, and the central discharge mechanism is used to control the discharge of pyrolysis gas and biochar in the carbonization section to the furnace tail device; The cylinder wall close to the discharge end is connected in a rotary and sealing manner, and the furnace tail air intake cylinder is provided with a hot gas inlet and a third ash discharge port.

When working, the material is fed into the drying section of the drum through the furnace head device, and the material is first heated indirectly and/or directly in the drying section. The heating gas entering the drying section directly contacts the material for heating, the material is dried, and the gas phase produced by drying is discharged through the furnace head device. The material is indirectly heated, the solid material is heated and decomposed under the condition of lack of oxygen, the carbonization treatment of the material is completed, and biochar and pyrolysis gas are generated. . Among them, the heating gas in the follower jacket and the drying section is introduced by the heating gas in the gas inlet cylinder at the end of the furnace, so that the heating gas is inhaled from the periphery of the drum.

Since the two process sections are completely isolated by the segmented plate, when the solid material is moving, when the solid-phase conveying device rotates to the bottom, the solid material in the drying section is conveyed to the carbonization through the solid-phase conveying device. The carbonization section can only be entered into the carbonization section through the solid-phase conveying device. Since the solid-phase conveying device is always filled with solid-phase materials, the gas phase is not allowed to pass through. Different working conditions are set in each section, and the materials can complete the corresponding process under different working conditions of each process section in the same rotary furnace, and by controlling the conveying operation of the solid phase conveying device, the residence time of the solid material in the drum can be effectively controlled. In addition, the central discharge mechanism can control the discharge in the carbonization section.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic structural diagram of a two-stage rotary kiln provided by an embodiment of the present invention;

Fig. 2 is the structural representation of the A-A section in Fig. 1;

Fig. 3 is the structural representation of the B-B section in Fig. 1;

4 is a schematic structural diagram of a second two-stage rotary kiln provided by an embodiment of the present invention;

5 is a schematic structural diagram of a third two-stage rotary kiln provided by an embodiment of the present invention;

6 is a schematic structural diagram of a fourth two-stage rotary kiln provided by an embodiment of the present invention;

7 is a schematic structural diagram of a fifth two-stage rotary kiln provided by an embodiment of the present invention;

8 is a schematic structural diagram of a sixth two-stage rotary kiln provided by an embodiment of the present invention;

Fig. 9 is the structural representation of the C-C section in Fig. 8;

10 is a schematic structural diagram of a solid phase conveying device of a two-stage rotary kiln provided by an embodiment of the present invention;

11 is a schematic structural diagram of another solid phase conveying device of a two-stage rotary kiln provided by an embodiment of the present invention;

12 is a schematic structural diagram of a burner kiln body of a two-stage rotary kiln provided by an embodiment of the present invention;

13 is a schematic structural diagram of a burner kiln body of another two-stage rotary kiln provided by an embodiment of the present invention;

14 is a schematic structural diagram of a burner kiln body of another two-stage rotary kiln provided by an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a seventh two-stage rotary kiln provided by an embodiment of the present invention.

In Figures 1-15, 1 is the drum, 2 is the follower jacket, 3 is the furnace tail kiln body, 31 is the discharge port, 32 is the pyrolysis gas outlet, 9 is the solid phase conveying device, and 91 is the cylinder , 911 is the material inlet, 912 is the material outlet, 92 is the screw part, 93 is the power part, 10 is the furnace head kiln body, 101 is the first exhaust port, 102 is the first ash outlet, 11 is the feeding mechanism, 13 is the ventilation pipe, 14 is the furnace tail air intake tube, 141 is the third ash discharge port, 142 is the hot gas inlet, 15 is the segment plate, 17 is the center discharge mechanism, 18 is the turning plate, 21 is the insulation layer, 22 It is an air supply pipe, 221 is an air supply branch pipe, 222 is an air supply main pipe, 23 is a variable diameter section, 24 is a sealing member, and 25 is a conical surface.

Detailed ways

The core of the invention is to provide a two-stage rotary kiln, which realizes that different processes of materials are carried out in the same rotary kiln, and can effectively control the residence time of solid materials in the drum.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-11, the embodiment of the present invention provides a two-stage rotary furnace, including a drum 1, a solid-phase conveying device 9, a follow-up jacket 2, a central discharge mechanism 17, a furnace tail gas inlet 14, The furnace head device and the furnace tail device; wherein, the furnace head device and the furnace tail device are fixed and fixed, the two ends of the drum 1 are respectively connected with the furnace head device and the furnace tail device in a rotational and sealing manner, the drum 1 rotates continuously in the same direction, and the drum 1 The two ends of the drum 1 are the feeding end and the discharging end respectively, and the discharging end is closed. Section I and carbonization section II, the gas phase and solid phase are completely isolated between each process section; the two ends of the solid phase conveying device 9 are respectively connected to the drying section I and the carbonization section II, for the solid material between the drying section I and the carbonization section II Conveying; the follower jacket 2 is fixed on the cylinder wall of the drum 1, the follower jacket 2 rotates with the roller 1, the follower jacket 2 is used to pass heating gas, the carbonization section II is an indirect heating section, and the drying section I It is an indirect heating section and/or a direct heating section, the indirect heating section heats the material through the partition wall of the follower jacket 2, and the direct heating section directly contacts the heating material by feeding heating gas, as shown in Figure 1, Figure 4, Figure 5 and Figure 8 As shown, the cylinder wall of the carbonization section II is fixedly provided with a follower jacket 2. If the drying section I is an indirect heating section or a combination of an indirect heating section and a direct heating section, the cylinder wall of the drying section I is also fixedly provided with a follower jacket. Jacket 2, as shown in Figure 6 and Figure 7, and the follower jacket 2 of the two process sections is preferably a connected whole; as shown in Figure 1, Figure 4 and Figure 5, if the drying section I is only a direct In the heating section, the cylinder wall of the drying section I is not provided with the follower jacket 2; one end of the central discharge mechanism 17 is coaxially fixed to the discharge end of the drum 1 and communicated with the carbonization section II, and the other end of the central discharge mechanism 17 It is connected with the furnace tail device which is fixed and fixed, and the central discharge mechanism 17 is used to control the pyrolysis gas and biochar in the carbonization section II to be discharged to the furnace tail device; the furnace tail air inlet tube 14 is fixed and fixed, and the furnace tail The air inlet cylinder 14 is connected with the cylinder wall near the discharge end of the drum 1 in a rotational and sealing manner. The furnace tail air inlet cylinder 14 is provided with a hot gas inlet 142 and a third ash discharge port 141. The hot gas inlet 142 is used to introduce heating gas, and the third ash discharge port 141 is used to discharge the dust separated from the heating gas, and the furnace tail air inlet 14 is communicated with the follower jacket 2 .

When the two-stage rotary kiln is working, the material is fed into the drying section I of the drum 1 through the furnace head device. Since the drum 1 is placed at a certain angle, the feed end is higher than the discharge end, and the drum 1 rotates continuously in the same direction. The material rolls and moves from the feed end to the discharge end under the action of its own weight. The material is first heated indirectly and/or directly in the drying section I, and the indirect heating is carried out through the follower jacket 2 of the drum wall 1 to heat the partition wall. Direct heating The heating gas introduced into the drying section I directly contacts the material for heating, the material is dried, the gas phase produced by drying is discharged through the furnace head device, and the dried solid material is moved to the carbonization section II through the solid phase conveying device 9. The follow-up jacket 2 of section II heats the material indirectly, and the solid material is heated and decomposed under the condition of lack of oxygen to complete the carbonization of the material and generate biochar and pyrolysis gas. The central discharging mechanism 17 rotates together with the drum 1, and the biochar and pyrolysis gas are discharged together through the central discharging mechanism 17 from the carbonization section II to the furnace tail device. Among them, the heating gas in the follower jacket 2 and the drying section I is passed through the heating gas in the furnace tail air inlet duct 14, so that the heating gas is inhaled from the periphery of the drum 1, and the conveying direction of the heating gas is opposite to the conveying direction of the material. It is beneficial to improve the heating efficiency.

Since the two process sections are completely isolated by the segmented plate 15, during the movement of the solid material, when the solid phase conveying device 9 is rotated to the bottom, the solid material in the drying section I is conveyed through the solid phase The device 9 is transported to the carbonization section II, and can only enter the carbonization section II through the solid-phase conveying device 9. Since the solid-phase conveying device 9 is always filled with solid-phase materials, the gas phase is not allowed to pass through, and each process section is independent of each other. Therefore, it is allowed to set different working conditions in each process section, the material can complete the corresponding process under different working conditions of each process section in the same rotary furnace, and by controlling the conveying operation of the solid phase conveying device 9, the effective Control the residence time of solid materials in drum 1. In addition, the central discharge mechanism 17 can control the discharge in the carbonization section II.

Further, in this embodiment, the furnace tail air intake duct 14 is covered outside the discharge end of the drum 1, and the two sides of the furnace tail air intake duct 14 are respectively connected with the cylinder wall of the discharge end of the drum 1 and the outer wall of the central discharge mechanism 17. Turn the seal connection. In this way, the discharge end of the drum 1 can be covered in the furnace tail air intake duct 14 to maintain the temperature of the discharge end, and the rotating sealing surface of the furnace tail air intake duct 14 and the central discharge mechanism 17 is relatively small, which is beneficial to seal. Of course, both sides of the furnace tail air intake cylinder 14 can also be connected to the cylinder wall of the discharge end of the drum 1 in a rotational and sealing manner, but the discharge end of the drum 1 is partially exposed to the outside, which is not conducive to heat preservation, and the two ends of the furnace tail air intake cylinder 14 The rotating sealing surface is larger.

As shown in Figure 1, Figure 3, Figure 4-Figure 9, in this embodiment, the drum 1 is provided with an air supply pipe 22 and/or a ventilation pipe 13;

Specifically, as shown in Fig. 1, Fig. 4, Fig. 6 and Fig. 8, one end of the air supply pipe 22 is connected to the furnace tail air inlet 14, and the other end of the air supply pipe 22 extends into the drying section I, and is connected with the drying section I and/or Or the follower jacket 2 is connected. When the air supply pipeline 22 is communicated with the drying section I, the heating gas in the furnace tail air inlet 14 is directly passed into the drying section I through the air supply pipeline 22 for direct contact heating. At this time, the drying section I is a direct heating section or a direct heating section. Combination with the indirect heating section; when one end of the air supply pipe 22 extending into the drying section I is only connected to the follower jacket 2, the heating gas participating in the indirect heating in the air supply pipe 22 enters the follower jacket 2, and passes through the follower jacket 2. The movable jacket 2 is discharged to the furnace head device. At this time, the drying section I is an indirect heating section; when the air supply pipeline 22 extends into the opening of the drying section I and is connected to the follower jacket 2, the air supply pipeline 22 will be heated. When the gas is introduced into the drying section I for direct contact heating, the heating gas participating in the indirect heating in the follower jacket 2 enters the air supply pipeline 22, enters the drying section I and continues to participate in the direct contact heating, and finally is discharged to the furnace head device, At this time, the drying section I is a direct heating section or a combination of a direct heating section and an indirect heating section. In addition, the air supply pipe 22 is arranged in the drum 1, and when the heating gas passes through the air supply pipe 22, the material in the drum 1 can be indirectly heated through the air supply pipe 22, making full use of the heat and improving the heating efficiency;

As shown in Figure 5 and Figure 7, the vent pipe 13 communicates with the follower jacket 2 and the drying section I, and the heating gas in the follower jacket 2 is passed into the drying section I through the vent pipe 13 for direct contact heating. During operation, the heating gas in the furnace tail air inlet duct 14 first enters the follower jacket 2, and then enters the drying section I. At this time, the drying section I is a direct heating section or a combination of a direct heating section and an indirect heating section.

The air supply pipe 22 and the ventilation pipe 13 can be set at the same time, so that the heating gas enters the drying section I through two paths, one way enters the drying section I through the furnace tail air intake cylinder 14 and the air supply pipe 22, and the other way passes through the furnace tail air intake cylinder 14, The follower jacket 2 and the ventilation pipe 13 enter the drying section I. Of course, the air supply pipe 22 and the ventilation pipe 13 may also be provided independently. As long as the heating gas can be passed into the drying section I to directly contact the heating material.

As shown in FIG. 3 and FIG. 9 , as an optimization, in this embodiment, the air supply pipeline 22 includes an air supply main pipe 222 and an air supply branch pipe 221 , the air supply branch pipe 221 is communicated with the furnace tail air inlet 14 , and one end of the air supply main pipe 222 is connected with the air supply branch pipe 221 The other end of the air supply main pipe 222 is communicated with the drying section I and/or the follower jacket 2. The air supply main pipe 222 has one pipe or a plurality of parallel pipes, as shown in FIG. 9, specifically two or three , four and more root canals. When the follower jacket 2 is communicated with the air supply main pipe 222 , preferably, the position of the follower jacket 2 close to the feed end is communicated with the air supply main pipe 222 .

During operation, the heating gas in the furnace tail air inlet tube 14 enters the air supply branch pipe 221 through the opening on the wall of the drum 1, and then enters the air supply main pipe 222. If the air supply main pipe 222 extends into the drying section I at one end open, the heating gas Direct contact heating is carried out through the air supply main pipe 222 into the drying section I. If one end of the air supply main pipe 222 extends into the drying section I and is connected to the follower jacket 2, the heating gas enters the drying section I through the air supply main pipe 222 for direct contact heating, and at the same time, in the follower jacket 2 The heating gas that participates in the indirect heating is discharged into the gas supply main pipe 222, and finally enters the drying section I, continues to participate in the direct contact heating, and finally is discharged to the furnace head device together with the gas in the drying section I. If the end of the air supply main pipe 222 that extends into the drying section I is closed and communicated with the follower jacket 2, the heating gas participating in the indirect heating in the air supply main pipe 222 enters the follower jacket 2, and then flows from the follower jacket 2. 2 Discharge to the furnace head device.

As an optimization, the number of the air supply branch pipes 221 may be one or more, and the multiple air supply branch pipes 221 are preferably communicated with the air supply main pipe 222 in a radial shape, so as to improve the air supply uniformity. As shown in FIG. 9 , if the air supply main pipe 222 has a plurality of pipes, each of the pipes is communicated with one air supply branch pipe 221 respectively.

As shown in FIG. 1 and FIG. 2 , in this embodiment, the center discharge mechanism 17 is optimized. The center discharge mechanism 17 is a center screw discharge mechanism or a center piston discharge mechanism. The inlet of the center discharge mechanism 17 is fixed with a flipper. The material plate 18, the plate surface of the turning plate 18 is parallel to the axis of the drum 1, the turning plate 18 is extended and fixed on the inner wall of the drum 1, the turning plate 18, the central discharging mechanism 17 and the drum 1 rotate together; The discharging mechanism includes a central discharging cylinder, a central screw and a second power component. One end of the central discharging cylinder is fixed to the discharging end of the drum 1, and the other end is rotationally and sealedly connected with the furnace tail device, and the central discharging cylinder is connected to the furnace tail. The inlet cylinder 14 is connected in a rotary and sealing manner, the central discharge cylinder is provided with an inlet and an outlet, the inlet is opened on the wall of the cylinder, and the outlet is preferably arranged at the end of the central discharge cylinder. The whole rotates together; the central helical rotation is arranged on the central discharge cylinder; the second power component is drivingly connected with the central helix, and is used to drive the central helix to rotate relative to the central discharge cylinder; as shown in Figure 1, the second power member is preferably arranged in the center One end of the screw away from the discharge end, the second power component is driven and connected with the central screw through the rotating shaft, and the rotating shaft is sealed and connected with the second power component after passing through the furnace tail device.

When the central screw discharge mechanism is working, the drum 1, the turning plate 18 and the central screw discharge mechanism rotate together, and the turning plate 18 pockets the material in the drum 1 and guides it into the inlet of the central discharge cylinder. The second power component Work, drive the central screw to rotate, transport the material to the furnace tail device, and the gas in the discharge end of the drum 1 can also enter the furnace tail device through the central screw discharge mechanism. The discharge of the drum 1 is controlled by the start and stop of the second power component, and the controllable discharge is realized.

In the same way, the central piston discharge mechanism realizes the controllable conveying of materials through the reciprocating movement of the piston, which will not be described in detail here.

As shown in FIG. 1, in this embodiment, the furnace tail device includes a furnace tail kiln body 3, and the furnace tail kiln body 3 is provided with a pyrolysis gas outlet 32 and a discharge port 31. The furnace tail kiln body 3 is fixedly connected to the The central discharge mechanism 17 is connected in a rotary seal.

During operation, the drum 1 rotates in a single direction relative to the stationary furnace tail kiln body 3, and the biochar and pyrolysis gas in the carbonization section II of the drum 1 are transported to the furnace tail kiln body 3 through the central discharge mechanism 17, and the biological The char and the pyrolysis gas are separated in the furnace tail kiln body 3 , the pyrolysis gas is discharged through the pyrolysis gas outlet 32 , and the biochar is discharged from the discharge outlet 31 .

Further, in this embodiment, the two-stage rotary furnace also includes a hot blast stove (not shown in the figure), which is used for combustion to generate heating gas. As the source of the heating gas, the hot blast stove is provided with a hot gas outlet, and the hot gas outlet passes through. The hot gas conveying pipe is communicated with the hot gas inlet 142 of the furnace tail air inlet duct 14, and is used for passing the heating gas in the hot blast stove into the furnace tail air inlet duct 14 to provide heating gas required for heating.

As an optimization, the hot blast furnace includes a combustion furnace body and a burner. The combustion furnace body is provided with an air inlet, a hot gas outlet and a second ash discharge port. The burner is communicated with the combustion furnace body and is used for combustion in the combustion furnace body to generate heating gas. The device can use natural gas, biomass, fuel oil, etc. as fuel; the air inlet is used to introduce oxygen-containing gas to participate in the combustion reaction.

When working, the burner works, and combustion occurs in the combustion furnace body to generate heating gas, and the heating gas is passed into the furnace tail air inlet as a heating medium, and then participates in the direct heating and/or indirect heating of the materials in the drum 1.

Further, in this embodiment, the pyrolysis gas outlet 32 of the furnace tail kiln body 3 is communicated with the hot blast stove through a pyrolysis gas conveying pipe, so as to pass the pyrolysis gas in the furnace tail kiln body 3 into the hot blast stove for combustion. .

During operation, the pyrolysis gas and biochar in the carbonization section II enter the furnace tail kiln body 3 through the central discharge mechanism 17 for separation, and the pyrolysis gas enters the hot blast furnace through the pyrolysis gas outlet 32 and the pyrolysis gas conveying pipe 4. The biochar is discharged through the discharge port 31, the pyrolysis gas is combusted in the hot blast furnace, and the hot gas generated by the combustion is discharged from the hot gas outlet and enters the furnace tail air intake duct 14. It can be seen that the energy consumption of the pyrolysis gas in the drum 1 is used to reduce the energy consumption.

As shown in Figure 1, Figure 12-Figure 14, in this embodiment, the furnace head device includes a furnace head kiln body 10 and a feeding mechanism 11; wherein, the furnace head kiln body 10 is provided with an exhaust chamber, and the exhaust gas The chamber is provided with a first exhaust port 101 and a first ash discharge port 102, the furnace head kiln body 10 is fixedly connected with the feed end of the drum 1 in a rotational and sealing manner, and the drying section I is communicated with the exhaust chamber; The feeding mechanism 11 is sealed through the furnace head kiln body 10 and extends into the drum 1, and the feeding mechanism 11 is provided with a feeding port.

During operation, the material enters the feeding mechanism 11 through the feeding port, and the feeding mechanism 11 transports the material into the drying section I. With the continuous rotation of the drum 1, the solid material is transported to the carbonization section II through the solid-phase conveying device 9, wherein , the gas in the drying section I enters the exhaust chamber, and after being separated by gravity, the gas is discharged from the first exhaust port 101 , and the dust is discharged from the first ash discharge port 102 .

Further, as shown in FIGS. 6 and 7 , when a follower jacket 2 is fixed on the cylinder wall of the drying section I, both the follower jacket 2 and the drying section I communicate with the exhaust chamber. Then the gas in the drying section I and the gas in the follower jacket 2 both enter the exhaust chamber and then be discharged.

Specifically, as shown in FIGS. 1 , 4-8 and 12-13 , the drum 1 and the furnace head kiln body 10 are communicated through the variable diameter section 23 , and the feed end of the drum 1 and the furnace head kiln body 10 communicate with each other. One of them is fixedly connected to one end of the variable diameter section 23, and the feed end of the drum 1 and the other of the furnace head kiln body 10 are connected to the other end of the variable diameter section 23 in a rotational and sealing manner; the outer diameter of the variable diameter section 23 is smaller than that of the drum. 1 the outer diameter of the remaining shaft segments. This arrangement reduces the rotary sealing area between the feed end of the drum 1 and the furnace head kiln body 10, and improves the rotary sealing performance.

Specifically, as shown in FIGS. 1 , 4-8 and 12 , the feed end of the drum 1 is fixedly connected to one end of the diameter-reducing section 23 , and the other end of the diameter-changing section 23 is connected to the furnace head kiln body 10 in a rotational and sealing manner . The drum 1 and the variable diameter section 23 rotate together relative to the furnace head kiln body 10 which is fixedly arranged.

As shown in FIG. 13 , one end of the variable diameter section 23 is fixedly connected to the furnace head kiln body 10 , and the other end of the variable diameter section 23 is connected to the feed end of the drum 1 in a rotational and sealing manner. The variable diameter section 23 and the furnace head kiln body 10 are integrated and fixed, and the drum 1 rotates relative to the variable diameter section 23 and the furnace head kiln body 10 .

Of course, the feed end of the drum 1 may not be provided with the variable diameter section 23. As shown in FIG. 14, the feed end of the drum 1 is directly inserted into the furnace head kiln body 10, and the cylinder wall of the feed end is connected to the furnace head kiln body 10. Rotate the sealing connection, but the sealing surface is larger than that provided with the reducing section 23 . Further, as shown in FIG. 13 , when the feed end of the drum 1 is rotatably connected to the diameter-reducing section 23 , the feeding end of the drum 1 is rotatably and sealingly matched with the cylinder wall of the diameter-changing section 23 through the conical surface 25 . A sealing gasket is arranged between it and the cylindrical wall of the reducing section 23 . The sealing structure has good structural stability and long service life.

Alternatively, when the furnace head kiln body 10 is rotatably connected to the diameter reducing section 23, the furnace head kiln body 10 can also be rotated and sealingly matched with the cylinder wall of the reducing diameter section 23 through the conical surface 25. Gaskets are provided between the walls. The stability and service life of the sealing structure are also improved.

As shown in FIG. 1 and FIG. 12 , when the furnace head kiln body 10 is rotatably connected with the diameter reducing section 23 , the part of the furnace head kiln body 10 that is used to rotate and cooperate with the diameter reducing section 23 is perpendicular to the axis of the reducing diameter section 23 . The vertical surface, the vertical surface and the cylindrical wall of the variable diameter section 23 are sealed by seals.

Or, when the feed end of the drum 1 is connected in rotation with the diameter-reducing section 23, the position where the feeding end of the drum 1 is used to rotate and cooperate with the diameter-reducing section 23 is a vertical plane perpendicular to the axis of the diameter-changing section 23, and the vertical plane It is sealed with the cylindrical wall of the reducing section 23 by a seal. As long as good sealing between the feed end of the drum 1 and the furnace head kiln body 10 can be achieved, it is not limited to the sealing and matching structure listed in this embodiment.

As shown in Figures 10 and 11, the solid phase conveying device 9 is optimized. In this embodiment, the solid phase conveying device 9 is a screw conveyor, and the screw conveyor is inserted into the drying section I and Inside the carbonization section II and passing through the segment plate 15, the material inlet 911 of the screw conveyor is located in the drying section I, and the material outlet 912 of the screw conveyor is located in the carbonization section II.

During operation, with the rotation of the drum 1, the material rolls down and moves forward along the inner wall in the drum 1. The material moves to the segment plate 15 and is blocked. The material gathers in the drying section I near the segment plate 15, and the material enters. The material inlet 911 of the screw conveyor in the drying section I, the screw conveyor works, and the material is transported from the material inlet 911 of the screw conveyor to the material outlet 912 in the carbonization section II, and finally enters the carbonization section II. The transportation of solid phase materials between two process sections.

Since the screw conveyor is obliquely inserted into two adjacent process sections, it is equivalent to that the material is transported between the two adjacent process sections inside the drum 1. In the process of conveying the material by the screw conveyor, the material It does not leave the inside of the drum 1, therefore, the heat dissipation of the material is reduced, and the heat loss is reduced.

Of course, the screw conveyor can also be installed on the outside of the drum 1 as a whole, and the material inlet 911 and the material outlet 912 are respectively connected to the two process sections. However, when the material is conveyed between the two process sections, the material is separated from the drum 1 and the material Heat dissipation is fast, resulting in heat loss.

Further, in this embodiment, the screw conveyor includes a cylinder body 91, a screw part 92 and a power part 93, wherein the cylinder body 91 is sealed and inserted into the drying section I and the carbonization section II from the outside of the drum 1 in an inclined manner, and is sealed. Passing through the segmented plate 15, the material inlet 911 of the cylinder 91 is located in the drying section I, and the material outlet 912 of the cylinder 91 is located in the carbonization section II; In order to move the material from the material inlet 911 to the material outlet 912; the power part 93 is located outside the drum 1, and the power part 93 is drivingly connected with the screw part 92 for driving the screw part 92 to rotate.

During operation, with the rotation of the drum 1, the material rolls down and moves forward along the inner wall in the drum 1. The material moves to the segment plate 15 and is blocked. The material gathers in the drying section I near the segment plate 15, and the material enters. The material inlet 911 of the screw conveyor in the drying section I drives the screw member 92 to move through the power component 93, and the material is transported from the material inlet 911 of the screw conveyor to the material outlet 912 in the carbonization section II, and finally enters the carbonization section. Ⅱ, complete the transportation of solid phase material between the two process sections.

As shown in FIG. 11 , further, in this embodiment, the outer part of the screw member 92 in the drying section I of the screw conveyor is not provided with the cylinder 91 . That is, the part of the screw conveyor that penetrates into the drying section I is not provided with the cylinder 91, so that the screw part 92 in the drying section I is completely exposed to the drum 1, the screw part 92 directly contacts the material, and the material wraps the screw part 92 . This setting is because the material (such as sludge) may have stickiness or plasticity, and may stick and block when entering the material inlet 911 of the screw conveyor. Therefore, remove the cylinder 91 at the position of the material inlet 911 and directly pass the exposed The spiral part 92 is used for conveying, which avoids bonding and blockage, and makes the material conveying smoother and more reliable.

Further, in this embodiment, the material outlet 912 is opened on the end face of the cylinder 91 away from the power part 93 , that is, the end of the cylinder 91 away from the power part 93 is completely open, so that the axis of the material outlet 912 is connected to the cylinder 91 . The axes of the body 91 are coincident, which is more favorable for the material to be discharged and cleaned from the cylinder body 91 to avoid clogging.

In this embodiment, the helical part 92 in the cylinder 91 is an intermittent helical, and/or there is a distance between the end of the helical part 92 away from the power part 93 and the material outlet 912 . In this way, when the material is conveyed in the cylinder 91, since the screw member 92 is an intermittent screw, a filler space is formed between two adjacent helices, and the material blocks the cylinder 91 in the filler space, so that the screw member 92 is transporting Both the material and the state of stopping the conveying of the material hinder the passage of the gas phase, so as to ensure the independence between each process section and not affect the process of each process section.

There is a distance between the end of the screw member 92 away from the power member 93 and the material outlet 912. This distance can form a packing space, and the material can block the cylinder 91 in the packing space, which can also play the role of the screw member 92 in conveying materials and stopping. In the state of conveying the material, it hinders the passage of the gas phase, which ensures the independence of each process section and does not affect the process of each process section.

Therefore, when the screw conveyor rotates with the drum 1 to the upper position of the drum 1, since the screw conveyor is separated from the material in the drum 1, the cylinder 91 can be kept blocked by the material retained in the screw conveyor to achieve gas phase isolation. effect. When the screw conveyor is located above, the screw conveyor can continue to run. During the rotation of the screw conveyor from the top to the bottom, the material retained in the screw conveyor continues to be transported, which can meet the blocking requirements during this period of time. Of course, when the screw conveyor is at the top, the screw conveyor can also stop running, and the remaining materials can be stopped to meet the blocking requirements.

Of course, the spiral part 92 can also be a continuous spiral, and the material is filled in the spiral channel of the continuous spiral, which can also block the cylinder 91 and prevent the gas phase from passing through.

As an optimization, in this embodiment, the power component 93 is an electric motor or a hydraulic motor. Preferably, the electric motor or hydraulic motor is connected to the screw member 92 through a reducer, so that the screw member 92 has a suitable speed, as long as the screw member 92 can be driven. It is only necessary to rotate, and is not limited to the form listed in this embodiment.

Further, in this embodiment, the screw conveyor also includes a controller and a position switch, the power component 93 and the position switch are both connected to the controller signal, and the position switch is arranged on the drum 1. When the screw conveyor is directly below the drum 1 When it is within the range of plus or minus 10° to 30°, it is preferably about plus or minus 15° directly below the drum 1, that is, when the screw conveyor is within the range of material accumulation directly under the drum 1, the position switch is triggered, and the controller controls the power components. 93 runs, the power part 93 drives the screw part 92 to move.

The purpose of this setting is: when the screw conveyor rotates to the high position with the drum 1, there is no material in the material inlet 911, and the screw part 92 may be idling, causing the material in the screw part 92 to be transported to the next process section, while the material inlet 911 Since there is no material, the material in the spiral part 92 may be emptied or the material may not fill the spiral part 92 although it is not emptied, and a gas channel is formed in the spiral part 92, so that the gas phase communicates between the process sections. Air pressure difference, gas phase flow occurs between process sections, which affects the process purpose and effect of segmented treatment.

Therefore, by setting the controller and the position switch, when the roller 1 rotates to the point where the screw conveyor is outside the range of plus or minus 10° to 30°, that is, when the screw conveyor is outside the accumulation range directly under the roller 1 , the position switch is not triggered, the controller controls the power part 93 to stop running, the screw part 92 does not rotate, and the screw conveyor does not transport the material, so that the material remains in the cylinder 91, and the cylinder 91 is blocked, further The role of gas phase isolation.

As an optimization, in this embodiment, the position switch is any one or a combination of a photoelectric switch or a magnetic induction switch. Specifically, the outer wall of the drum 1 is provided with a shielding piece or an induction piece of a photoelectric switch or a magnetic induction switch. When the screw conveyor is under the drum 1, the blocking sheet or the induction sheet triggers the photoelectric switch or the magnetic induction switch, the controller controls the operation of the power part, and the power part drives the screw part 92 to rotate for material conveying.

Of course, in addition to the use of a screw conveyor obliquely inserted into the drum 1, the solid-phase conveying device 9 can also be arranged outside the drum 1 in this embodiment. The inlet and the outlet of the solid-phase conveying device 9 They are respectively connected with the cylinder walls of the drying section I and the carbonization section II, but there will be heat loss in this setting.

For the solid phase conveying device 9 arranged outside the drum 1, the solid phase conveying device 9 can be a screw conveyor or a piston conveyor, and the piston conveyor is a piston type, and the material is pushed through the reciprocating movement of the piston.

As shown in FIG. 15 , in this embodiment, the two-stage rotary kiln further includes an exhaust box 20 in the furnace which is fixedly arranged, the drum 1 passes through the exhaust box 20 in the furnace, and the cylinder wall of the drying section I is in contact with the exhaust box 20 in the furnace. The exhaust box 20 in the furnace is connected in a rotating and sealing manner, the follower jacket 2 corresponding to the drying section I is communicated with the exhaust box 20 in the furnace, and the exhaust box 20 in the furnace is provided with a second exhaust port 201 and a fourth ash discharge port 202.

During operation, when the cylinder wall of the drying section I is provided with a follower jacket 2, the gas in the follower jacket 2 corresponding to the drying section I can be passed into the furnace exhaust box 20 which is fixed and fixed, and the gas Exhaust through the second exhaust port 201 of the exhaust box 20 in the furnace, and the dust separated from the gas is exhausted from the fourth ash exhaust port 202 . Therefore, the gas in the follower jacket 2 does not need to be discharged into the furnace head kiln body 10, and the position of the drum 1 can be directly selected at a certain position in the axial direction.

Further, in this embodiment, the position of the follower jacket 2 close to the furnace head device communicates with the exhaust box 20 in the furnace. This arrangement enables the heating gas in the follower jacket 2 to indirectly heat the entire drying section I, thereby improving the heating efficiency. Of course, the exhaust box 20 in the furnace can also be arranged at other axial positions of the follower jacket 2 .

Specifically, the outer cylinder wall of the follower jacket 2 is provided with a through hole corresponding to the position of the exhaust box 20 in the furnace, and the exhaust box 20 in the furnace is communicated with the follower jacket 2 through the through hole. During the rotation of the drum 1, the through hole is always communicated with the exhaust box 20 in the furnace. Therefore, the heating gas that has been heated in the follower jacket 2 is discharged into the exhaust box 20 in the furnace through the through hole, and then passes through the furnace. The second discharge port 201 of the exhaust box 20 is discharged.

On this basis, when the end of the hot gas delivery main pipe 81 or the air supply main pipe 222 that extends into the drying section I is closed and communicated with the follower jacket 2, the indirect heating gas in the hot gas delivery main pipe 81 and the gas supply main pipe 222 will be heated first. The heating gas does not need to be discharged through the furnace head kiln body 10, and the exhaust position of the drum 1 in the axial direction can be arbitrarily selected.

As an optimization, the included angle between the plate surface of the segmented plate 15 and the axis of the drum 1 is 45°˜135°, more preferably about 90°.

In this embodiment, the two-stage rotary kiln further includes at least one fixed partition plate disposed in the process section of the drum 1; the fixed partition plate is fixed in the drum 1, and an opening is provided on the fixed partition plate, and the opening is close to the drum 1 wall setting.

When working, the drum 1 rotates continuously in the same direction. When the opening of the fixed partition is located below, the solid material in the drum 1 can enter the downstream through the opening. At the same time, the opening will be blocked by the solid material, restricting the flow of gas. When the opening of the fixed partition is located below, the opening is not blocked by solid materials, and the gas can flow. By arranging fixed partitions in the process sections, each process section can be partitioned, and the gas phase flow between different partitions in each process section can be partially restricted, thereby facilitating the formation of temperature gradients in each partition and the independence of working conditions.

As shown in FIG. 3 , in this embodiment, a thermal insulation layer 21 is provided on the wall of the drum 1 to improve the thermal insulation effect of the drum 1 and reduce energy loss.

As shown in FIG. 1 , a driving device and a supporting device are provided outside the drum 1 , and the driving device is used to drive the drum 1 to continuously rotate in the same direction around its axis. The support device is used to rotate the support drum 1 to continuously rotate around its axis in the same direction.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (23)

1. A two-stage rotary kiln, comprising a drum (1), a furnace head device and a furnace tail device, wherein the feeding end of the drum (1) is connected in a rotational and sealing manner with the fixed furnace head device, and the drum (1) It can continuously rotate in the same direction, and it is characterized in that the interior of the drum (1) is divided into two independent process sections from the feed end to the discharge end by the segmented plate (15), which are respectively Drying section (I) and carbonization section (II), the two-stage rotary furnace also includes:

   A solid-phase conveying device (9), two ends of the solid-phase conveying device (9) are respectively connected to the drying section (I) and the carbonization section (II), for solid materials between the two process sections delivery;

   A follow-up jacket (2) is fixed on the cylinder wall of the drum (1), the inside of the follow-up jacket (2) is used for feeding heating gas, and the carbonization section (II) is an indirect heating section, so the The drying section (I) is an indirect heating section and/or a direct heating section, the indirect heating section heats the material through the partition wall of the follower jacket (2), and the direct heating section directly contacts the heating material by feeding heating gas ;

   A central discharge mechanism (17), the discharge end of the drum (1) is closed and arranged, and one end of the central discharge mechanism (17) is coaxially fixed on the discharge end of the drum (1) and is connected to the discharge end of the drum (1). The carbonization section (II) is connected, and the other end of the central discharge mechanism (17) is connected in a rotary and sealed manner with the furnace tail device which is fixedly arranged, and the central discharge mechanism (17) is used to control the carbonization section. (II) The pyrolysis gas and biochar are discharged to the furnace tail device;

   The furnace tail air intake cylinder (14) is fixedly arranged, the furnace tail air intake cylinder (14) is rotatably and sealedly connected with the cylinder wall of the drum (1) near the discharge end, and the furnace tail air intake cylinder (14) is provided There is a hot gas inlet (142) and a third ash discharge port (141), the hot gas inlet (142) is used to introduce heating gas, and the furnace tail gas inlet (14) is communicated with the follower jacket (2) .
2. The two-stage rotary kiln according to claim 1, characterized in that the furnace tail air intake cylinder (14) is covered outside the discharge end of the drum (1), and the central discharge mechanism (17) can be The side away from the feed end is rotatably sealed through the tail gas spool (14).
3. The two-stage rotary kiln according to claim 1, wherein the drum (1) is provided with an air supply pipe (22) and/or a ventilation pipe (13);

   The gas supply pipeline (22) communicates with the furnace tail air intake cylinder (14) and the drying section (I), and the follow-up jacket (2) is communicated with the gas supply pipeline (22) through the gas supply pipeline (22) feeding heating gas into the drying section (I) for direct contact heating;

   The ventilation pipe (13) communicates with the follower jacket (2) and the drying section (I), and the heating gas is introduced into the drying section (I) through the ventilation pipe (13) for direct contact heating.
4. The two-stage rotary kiln according to claim 3, characterized in that, the gas supply pipeline (22) comprises a gas supply main pipe (222) and a gas supply branch pipe (221), and the gas supply branch pipe (221) is connected to the furnace tail inlet pipe (221). The air cylinder (14) is in communication, one end of the air supply main pipe (222) is in communication with the air supply branch pipe (221), and the other end of the air supply main pipe (222) is connected with the drying section (I) and/or the follower The jacket (2) is communicated, and the part of the air supply main pipe (222) located in the drum (1) has one pipe or a plurality of pipes in parallel.
5. The two-stage rotary kiln according to claim 1, wherein the central discharging mechanism (17) is a central screw discharging mechanism or a central piston discharging mechanism, and the inlet of the central discharging mechanism (17) A turning plate (18) is fixed at the place, and the turning plate (18) is extended and fixed on the inner wall of the drum (1);

   The center screw discharge mechanism includes:

   A central discharge cylinder, one end of the central discharge cylinder is fixed to the discharge end of the drum (1), and the other end is connected with the furnace tail kiln body (3) in a rotational and sealing manner, and the central discharge cylinder is connected to the The furnace tail air intake cylinder (14) is connected in a rotary seal;

   a central screw, which is rotatably arranged on the central discharge cylinder;

   The second power component is drivingly connected with the central screw, and is used for driving the central screw to rotate relative to the central discharge cylinder.
6. The two-stage rotary furnace according to claim 1, characterized in that, the furnace tail device comprises a furnace tail kiln body (3), and the furnace tail kiln body (3) is provided with a pyrolysis gas outlet (32) and A discharge port (31), the furnace tail kiln body (3) is fixedly connected with the central discharge mechanism (17) in a rotating and sealing manner.
7. The two-stage rotary furnace according to claim 6, further comprising a hot blast stove, which is used for combustion to generate heating gas, the hot blast stove is provided with a hot gas outlet, and the hot gas outlet passes through a hot gas conveying pipe It communicates with the hot gas inlet (142) of the furnace tail gas inlet (14).
8. The two-stage rotary kiln according to claim 7, characterized in that the pyrolysis gas outlet (32) of the furnace tail kiln body (3) is communicated with the hot blast stove through a pyrolysis gas conveying pipe, used for transferring The pyrolysis gas in the furnace tail kiln body (3) is passed into the hot blast furnace for combustion.
9. The two-stage rotary kiln according to any one of claims 1-8, wherein the burner device comprises:

   A furnace head kiln body (10), an exhaust chamber is provided in the furnace head kiln body (10), and a first exhaust port (101) and a first ash discharge port (102) are opened in the exhaust chamber , the furnace head kiln body (10) is fixedly connected with the feed end of the drum (1) in a rotational and sealing manner, and the drying section (I) is communicated with the exhaust chamber;

   A feeding mechanism (11), the feeding mechanism (11) is sealed through the furnace head kiln body (10) and protrudes into the drum (1), and the feeding mechanism (11) is provided with a feeding mouth.
10. The two-stage rotary kiln according to claim 9, characterized in that, when a follower jacket (2) is fixed on the cylinder wall of the drying section (I), the follower jacket (2) and the The drying section (I) is all communicated with the exhaust chamber (103).
11. The two-stage rotary kiln according to claim 9, characterized in that, the drum (1) and the furnace head kiln body (10) are communicated through a variable diameter section (23), and the drum (1) One of the feed end of the drum (1) and the burner kiln body (10) are fixedly connected to one end of the diameter-changing section (23), and the feed end of the drum (1) is connected to the burner head kiln body (10). ) is connected with the other end of the variable diameter section (23) in a rotational and sealing manner; the outer diameter of the variable diameter section (23) is smaller than the outer diameter of the remaining shaft sections of the drum (1).
12. The two-stage rotary kiln according to claim 11, characterized in that, the feed end of the drum (1) or the furnace head kiln body (10) communicates with the variable diameter section (10) through a conical surface (25). 23) The cylinder wall of the cylinder wall is rotated and sealed, and a sealing gasket is provided between the conical surface (25) and the cylinder wall of the reducing diameter section (23);

    Alternatively, the position of the feed end of the drum (1) or the furnace head kiln body (10) for rotating and cooperating with the diameter-changing section (23) is perpendicular to the axis of the diameter-changing section (23). The vertical surface of the vertical surface and the cylindrical wall of the diameter reducing section (23) are sealed by a seal.
13. The two-stage rotary furnace according to claim 11, characterized in that, when the follower jacket (2) is fixed on the cylinder wall of the drying section (I), the follower jacket (2) Both the drying section (I) communicate with the exhaust chamber through the variable diameter section (23).
14. The two-stage rotary kiln according to claim 1, characterized in that, the solid phase conveying device (9) is a screw conveyor, and the screw conveyor is inclined and sequentially inserted into the rotating drum from the outside of the drum (1). In the drying section (I) and the carbonization section (II), and passing through the segmented plate (15), the material inlet (911) of the screw conveyor is located in the drying section (I), so The material outlet (912) of the screw conveyor is located in the carbonization section (II).
15. The two-stage rotary kiln according to claim 14, characterized in that, the screw conveyor comprises a power part (93), a screw part (92) and a cylinder (91), and the screw part (92) is provided in the Inside the cylinder (91), the screw member (92) is connected with the power member (93) in a driving manner, and the material outlet (912) of the screw conveyor is opened at the end of the cylinder (91) , the part of the screw conveyor located in the drying section (I) is not provided with the cylinder (91).
16. The two-stage rotary kiln according to claim 15, characterized in that the helical part (92) is an intermittent helical or a continuous helical, and/or the helical part (92) is close to the surface of the screw conveyor. There is a distance between one end of the material outlet (912) and the end of the cylinder (91).
17. The two-stage rotary kiln according to claim 15, further comprising a controller and a position switch, the power component (93) and the position switch are both signally connected to the controller, and the position switch Set on the drum (1), when the solid-phase conveying device (9) is within the material accumulation range directly below the drum (1), the position switch is triggered, and the controller controls the power component (93) ) operation, the power part (93) drives the screw part (92) to move.
18. The two-stage rotary kiln according to claim 17, wherein the position switch is any one or a combination of a photoelectric switch or a magnetic induction switch.
19. The two-stage rotary kiln according to claim 1, characterized in that, the solid-phase conveying device (9) is arranged outside the drum (1), and the inlet and the outlet of the solid-phase conveying device (9) They are respectively connected with the cylinder walls of the drying section (I) and the carbonization section (II).
20. The two-stage rotary kiln according to claim 19, characterized in that, the solid phase conveying device (9) is a screw conveyor or a piston conveyor.
21. The two-stage rotary kiln according to any one of claims 1-8 and 10-20, characterized in that it further comprises a furnace exhaust box (20) which is fixedly arranged, and the drum (1) passes through The exhaust box (20) in the furnace, and the cylinder wall of the drying section (I) is connected in a rotational and sealing manner with the exhaust box (20) in the furnace. The movable jacket (2) is communicated with the furnace exhaust box (20), and the furnace exhaust box (20) is provided with a second exhaust port (201) and a fourth ash exhaust port (202).
22. The two-stage rotary furnace according to claim 21, characterized in that, a position of the follower jacket (2) close to the furnace head device is communicated with the furnace exhaust box (20).
23. The two-stage rotary furnace according to claim 21, characterized in that, corresponding to the cylindrical wall of the furnace exhaust box (20), the follower jacket (2) is provided with a connection with the furnace exhaust box. (20) through holes.

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