Pyrolysis equipment and sludge treatment system having the same

Abstract

The present invention discloses a pyrolysis device and a system for treating sludge with the same, wherein the pyrolysis device comprises: an inner cylinder, a rotating shaft and an outer cylinder, one end of the inner cylinder is provided with a feed port, and the other end of the inner cylinder is provided with a pyrolysis carbon outlet and a pyrolysis oil and gas outlet; the rotating shaft is rotatably arranged, and the rotating shaft extends into the inner cylinder from one end of the inner cylinder along the length direction of the inner cylinder, and the rotating shaft is provided with a spiral blade and a heating element, and the spiral blade is provided with a soft contact element; the outer cylinder is sleeved on the inner cylinder, and a high-temperature hot air channel is formed between the inner cylinder and the outer cylinder, one end of the outer cylinder is provided with a high-temperature hot air inlet, and the other end of the outer cylinder is provided with a hot air outlet after heat exchange. The pyrolysis device has a better dynamic sealing effect, and has a higher pyrolysis efficiency for pyrolyzing sludge using the device.

Description

Technical Field

[0001] The invention belongs to the field of pyrolysis, and in particular relates to a pyrolysis device and a sludge processing system having the same. Background Art

[0002] Sludge pyrolysis is generally carried out by heating in an anaerobic atmosphere. Sludge pyrolysis is the process of decomposing organic matter in sludge into pyrolytic carbon, pyrolytic gas and trace tar. Sludge pyrolysis has the advantages of harmlessness, complete reduction, environmental friendliness and high degree of resource utilization. For example, since pyrolytic carbon has more micropores and specific surface area, and contains a higher fixed carbon content and rich nutrients such as N, P, K, etc., pyrolytic carbon can be used as a functional material in various industries.

[0003] At present, sludge pyrolysis is generally carried out by different rotary kilns. However, rotary kilns generally use outer cylinders for rotation, which consumes a lot of energy, and the dynamic sealing of the kiln head and kiln tail is difficult, and it is impossible to ensure an oxygen-free environment in the furnace, which makes the sludge pyrolysis become oxygen-deficient combustion, which inevitably produces harmful substances such as dioxins. In addition, the current pyrolysis equipment has a poor heating effect, resulting in a slow sludge pyrolysis rate. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide a pyrolysis device and a sludge treatment system having the same, wherein the pyrolysis device has a better dynamic sealing effect and has a higher pyrolysis efficiency for pyrolyzing sludge using the device.

[0005] In one aspect of the present invention, the present invention provides a pyrolysis device. According to an embodiment of the present invention, the pyrolysis device comprises:

[0006] An inner cylinder, wherein one end of the inner cylinder is provided with a feed inlet, and the other end of the inner cylinder is provided with a pyrolysis carbon outlet and a pyrolysis oil and gas outlet;

[0007] A rotating shaft, the rotating shaft is rotatably arranged, and the rotating shaft extends into the inner cylinder from one end of the inner cylinder along the length direction of the inner cylinder, the rotating shaft is provided with a spiral blade and a heating element, and the spiral blade is provided with a soft contact element;

[0008] The outer cylinder is sleeved on the inner cylinder, and a high-temperature hot air channel is formed between the inner cylinder and the outer cylinder. A high-temperature hot air inlet is provided at one end of the outer cylinder, and a hot air outlet after heat exchange is provided at the other end of the outer cylinder.

[0009] According to the pyrolysis equipment of the embodiment of the present invention, a rotatable rotating shaft is arranged in the inner cylinder, and an outer cylinder is sleeved on the inner cylinder, and high-temperature hot air is supplied to the high-temperature hot air channel formed between the inner cylinder and the outer cylinder, that is, heat is supplied to the inner cylinder by indirect heat exchange to heat the material, and a spiral blade and a heating element are arranged on the rotating shaft. As the rotating shaft rotates, the spiral blade stirs the material in the inner cylinder and pushes the material forward, avoiding the problem of dynamic sealing difficulties at the kiln head and kiln tail caused by the rotation of the outer cylinder of the existing rotary kiln, thereby reducing the generation of dioxins and other harmful substances in the inner cylinder. At the same time, a soft contact element is arranged on the spiral blade to ensure the effective turning of the material in the gap between the spiral blade and the inner cylinder wall, which not only effectively increases the contact area between the material and the cylinder, but also avoids the problem of scratching between the spiral blade and the inner cylinder due to thermal expansion. In addition, the heating element arranged on the rotating shaft can heat the rotating shaft, and transfer the heat to the material in the inner cylinder through the rotating shaft, thereby improving the pyrolysis efficiency of the material in the inner cylinder. Therefore, the use of the equipment to pyrolyze sludge can improve the pyrolysis efficiency of sludge while realizing sludge resource utilization.

[0010] In addition, the pyrolysis device according to the above embodiment of the present invention may also have the following additional technical features:

[0011] In some embodiments of the present invention, one spiral turn of the spiral blade is a segment, the spiral blade is arranged between two adjacent segments, and a plurality of soft contact members are arranged between the two adjacent segments, thereby ensuring effective turning of the material between the spiral blade and the inner cylinder wall.

[0012] In some embodiments of the present invention, the lowest end of the soft contact member contacts the wall of the inner cylinder, thereby ensuring effective turning of the material in the gap between the spiral blade and the inner cylinder wall.

[0013] In some embodiments of the present invention, the soft contact member includes a chain, thereby ensuring effective turning of the material in the gap between the spiral blade and the inner cylinder wall.

[0014] In some embodiments of the present invention, the heating element includes a resistance wire, the rotating shaft is hollow to form a cavity, and the resistance wire is accommodated in the cavity.

[0015] In some embodiments of the present invention, the distance between the spiral blade and the inner cylinder is 15 to 50 mm.

[0016] In some embodiments of the present invention, a baffle is provided in the high-temperature hot air channel, thereby improving the pyrolysis efficiency of the material in the inner cylinder.

[0017] In some embodiments of the present invention, the inner wall of the outer cylinder is provided with a heat-insulating layer, thereby reducing the heat loss in the high-temperature hot air channel.

[0018] In another aspect of the present invention, the present invention provides a system for treating sludge. According to an embodiment of the present invention, the system for treating sludge comprises:

[0019] A drying device, the drying device having a sludge inlet and a dried sludge outlet;

[0020] A pre-pyrolysis device and a pyrolysis device, wherein at least one of the pre-pyrolysis device and the pyrolysis device is the above-mentioned pyrolysis equipment, the feed port on the pre-pyrolysis device is connected to the dry sludge outlet, and the feed port on the pyrolysis device is connected to the pre-pyrolysis material outlet on the pre-pyrolysis device;

[0021] A hot blast furnace, the hot blast furnace having a burner, a pyrolysis oil and gas inlet, a fuel inlet, a primary air inlet and a combustion smoke outlet, the pyrolysis oil and gas inlet is connected to the pyrolysis oil and gas outlet on the pyrolysis device, and the combustion smoke outlet is connected to the pyrolysis device.

[0022] According to the system for treating sludge of an embodiment of the present invention, the sludge is dried and then sequentially supplied to a pre-pyrolysis device and a pyrolysis device for treatment, and at least one of the pre-pyrolysis device and the pyrolysis device adopts the above-mentioned pyrolysis equipment with better dynamic sealing effect and higher pyrolysis efficiency, thereby improving the pyrolysis efficiency of the sludge. The pyrolysis oil and gas obtained in the pyrolysis device is then supplied to a hot blast furnace to be mixed with fuel and primary air for combustion, and the generated combustion flue gas is supplied to the pyrolysis device for utilization, thereby reducing the energy consumption of the system.

[0023] In addition, the system for treating sludge according to the above embodiment of the present invention may also have the following additional technical features:

[0024] In some embodiments of the present invention, the pre-pyrolysis device and the pyrolysis device are both the above-mentioned pyrolysis equipment, the combustion flue gas outlet is connected to the high-temperature hot air inlet on the pyrolysis device, the heat exchange hot air outlet on the pyrolysis device is connected to the high-temperature hot air inlet on the pre-pyrolysis device, the heat exchange hot air outlet on the pre-pyrolysis device is connected to the drying device, and the dry cold air outlet on the drying device is connected to the hot air furnace and the circulating air inlet on the drying device. In this way, the resource utilization of heat can be achieved and the energy consumption of the system can be reduced.

[0025] In some embodiments of the present invention, the above-mentioned sludge treatment system further includes: a water washing device, which has an inlet for gas to be purified and an outlet for purified gas, the pyrolysis oil and gas outlet on the pre-pyrolysis device is connected to the inlet for gas to be purified, and the outlet for purified gas is connected to the primary air inlet.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic structural diagram of a pyrolysis device according to an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the structure of a system for treating sludge according to an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of a system for treating sludge according to another embodiment of the present invention. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In one aspect of the present invention, the present invention provides a pyrolysis device. According to an embodiment of the present invention, reference Figure 1 The pyrolysis device includes an inner cylinder 100, a rotating shaft 200 and an outer cylinder 300.

[0037] According to the pyrolysis device of the embodiment of the present invention, Figure 1 , a feed port 101 is provided at one end of the inner cylinder 100, and a pyrolysis carbon outlet 102 and a pyrolysis oil and gas outlet 103 are provided at the other end of the inner cylinder 100. Specifically, the inner cylinder 100 is fixed, and the sludge is dried (the moisture content of the sludge after drying is less than 20wt%) and sent to the sealed screw feeder 11 through one or more of a tube chain machine (not shown), a scraper machine (not shown) and a screw conveyor (not shown), that is, to ensure an oxygen-free environment in the inner cylinder 100 and reduce the generation of harmful substances such as dioxins. The screw feeder 11 then supplies the sludge to the inner cylinder 100 through the feed port 101 for pyrolysis in an oxygen-free environment, and the pyrolysis carbon produced by pyrolysis is discharged through the pyrolysis carbon outlet 102, and the pyrolysis tar and pyrolysis gas produced at the same time are discharged through the pyrolysis oil and gas outlet 103 into a screw discharger (not shown) or a slag cooler (not shown) with a cooling jacket, and enter the charcoal bin for storage after cooling, and the cooling medium of the cooling jacket is circulating cooling water.

[0038] According to an embodiment of the present invention, referring to Figure 1The rotating shaft 200 is rotatably arranged, and the rotating shaft 200 extends into the inner cylinder 100 from one end of the inner cylinder 100 along the length direction of the inner cylinder 100. The rotating shaft 200 is provided with a spiral blade 21 and a heating element (not shown), and the spiral blade 21 is provided with a soft contact element 211. Specifically, the rotating shaft 200 is driven to rotate by an external power device 22 (such as a motor). As the rotating shaft 200 rotates, the spiral blades 21 stir the material in the inner cylinder 100 and push the material forward, thereby avoiding the problem of difficult dynamic sealing of the kiln head and the kiln tail caused by the rotation of the outer cylinder of the existing rotary kiln, thereby reducing the generation of dioxins and other harmful substances in the inner cylinder 100. At the same time, a soft contact member 211 is provided on the spiral blade 21 to ensure the effective turning of the material in the gap between the spiral blade 21 and the wall of the inner cylinder 100, which not only effectively increases the contact area between the material and the cylinder, but also avoids the problem of scratching between the spiral blade 21 and the cylinder of the inner cylinder 100 due to thermal expansion. In addition, the heating element (not shown) on the rotating shaft 200 can heat the rotating shaft 200, and transfer the heat to the material in the inner cylinder 100 through the rotating shaft 200, thereby improving the pyrolysis efficiency of the material in the inner cylinder 100.

[0039] Further, refer to Figure 1 , one spiral on the spiral blade 21 is a section, the spiral blade 211 is arranged between two adjacent sections, and a plurality of soft contact members 211 are arranged between the two adjacent sections. Preferably, the lowest end of the soft contact member 211 contacts the wall of the inner cylinder 100, that is, the soft contact member 211 is used to turn over the material that the spiral blade 211 cannot contact, which can not only improve the heat transfer efficiency, but also avoid the scratches caused by the contact between the ordinary copying plate and the inner cylinder wall due to thermal expansion. More preferably, the soft contact member 211 is a chain. It should be noted that the "lowest end of the soft contact member 211" is understood as the position when the soft contact member 211 is located at the bottom of the inner cylinder as the spiral blade 21 rotates.

[0040] Furthermore, the distance between the spiral blade 21 and the inner cylinder 100 is 15 to 50 mm, thereby reducing the accumulation of materials at the bottom of the inner cylinder 100 as much as possible and overcoming the scratching caused by the spiral blade 21 due to thermal expansion.

[0041] Further, a heating element (not shown) is arranged in the rotating shaft 200, that is, the rotating shaft 200 is heated by the heating element, and preferably the spiral blade 21 is a heat transfer element, that is, the heat generated by the heating element can be transferred to the spiral blade 21 through the rotating shaft 200, thereby improving the pyrolysis efficiency of the material in the inner cylinder 100. Preferably, the heating element (not shown) is a resistance wire. Specifically, the rotating shaft 200 is hollow to form a cavity, and the resistance wire is evenly accommodated in the cavity, that is, the rotating shaft 200 is heated by the resistance wire, thereby improving the pyrolysis efficiency of the material in the inner cylinder 100.

[0042] According to an embodiment of the present invention, referring to Figure 1, the outer cylinder 300 is sleeved on the inner cylinder 200, and a high-temperature hot air channel 31 is formed between the inner cylinder 200 and the outer cylinder 300, a high-temperature hot air inlet 301 is provided at one end of the outer cylinder 300, and a hot air outlet 302 after heat exchange is provided at the other end of the outer cylinder 300, that is, heat is supplied to the inner cylinder 100 by indirect heat exchange to heat the material. Specifically, the outer cylinder 300 and the inner cylinder 100 are both fixedly arranged, thereby avoiding the problem of dynamic sealing difficulties at the kiln head and the kiln tail caused by the rotation of the outer cylinder of the existing rotary kiln, thereby reducing the generation of dioxins and other harmful substances in the inner cylinder. At the same time, in order to improve the heat exchange efficiency between the high-temperature hot air in the high-temperature hot air channel 31 and the inner cylinder 100, it is preferred to set a baffle (not shown) in the high-temperature hot air channel 31, that is, to increase the disturbance and residence time of the high-temperature hot air in the high-temperature hot air channel 31. Further, a heat-insulating layer (not shown) is set on the side wall of the outer cylinder 300 to prevent heat from being transferred outward and improve the heat transfer efficiency to the inner cylinder 100.

[0043] According to the pyrolysis equipment of the embodiment of the present invention, a rotatable rotating shaft is arranged in the inner cylinder, and an outer cylinder is sleeved on the inner cylinder, and high-temperature hot air is supplied to the high-temperature hot air channel formed between the inner cylinder and the outer cylinder, that is, heat is supplied to the inner cylinder by indirect heat exchange to heat the material, and a spiral blade and a heating element are arranged on the rotating shaft. As the rotating shaft rotates, the spiral blade stirs the material in the inner cylinder and pushes the material forward, avoiding the problem of dynamic sealing difficulties at the kiln head and kiln tail caused by the rotation of the outer cylinder of the existing rotary kiln, thereby reducing the generation of dioxins and other harmful substances in the inner cylinder. At the same time, a soft contact element is arranged on the spiral blade to ensure the effective turning of the material in the gap between the spiral blade and the inner cylinder wall, which not only effectively increases the contact area between the material and the cylinder, but also avoids the problem of scratching between the spiral blade and the inner cylinder due to thermal expansion. In addition, the heating element arranged on the rotating shaft can heat the rotating shaft, and transfer the heat to the material in the inner cylinder through the rotating shaft, thereby improving the pyrolysis efficiency of the material in the inner cylinder. Therefore, the use of the equipment to pyrolyze sludge can improve the pyrolysis efficiency of sludge while realizing sludge resource utilization.

[0044] As described above, the pyrolysis device according to the embodiment of the present invention has at least one of the following beneficial effects:

[0045] (1) Increase the material contact area: By setting a heating element on the shaft, the temperature of the shaft can be controlled, which maximizes the contact area between the material and the shaft and the inner cylinder wall, thereby improving the heat transfer efficiency;

[0046] (2) Avoid equipment scratches: By setting a chain on the spiral blade, the bottom material that the spiral blade cannot reach can be turned over. At the same time, due to its active connection, it can avoid hard scratches between it and the cylinder wall caused by thermal expansion, which completely solves the two major problems that cannot be solved by ordinary scrapers and conveying equipment and the inner cylinder wall.

[0047] (3) The inner shaft rotation method is adopted to avoid the overall rotation of the entire outer cylinder loading material and other systems, thereby reducing the power consumption of the system.

[0048] In yet another aspect of the present invention, the present invention provides a system for treating sludge. Figure 2 The system includes: a drying device 400, a pre-pyrolysis device 500, a pyrolysis device 600 and a hot air furnace 700.

[0049] According to an embodiment of the present invention, referring to Figure 2 The drying device 400 has a sludge inlet 401 and a dry sludge outlet 402, and is suitable for drying the sludge to obtain dry sludge. Specifically, the sludge with a moisture content not higher than 60wt% is lifted from the sludge bin 41 to the strip cutter 42 at the top of the drying device 400 by a scraper conveyor (not shown), and then is cut into strips and sent to the sludge inlet 401 of the drying device 400. After entering the drying device 400, the sludge moves axially with the rotation of the rotating shaft under the push of the screw conveyor, and is finally discharged from the dry sludge outlet 402. Preferably, the drying of the sludge in the drying device 400 is performed by indirect heat exchange, that is, a ring system shell (not shown) is arranged outside the furnace of the drying device 400, and a spiral baffle (not shown) is arranged inside the ring system shell, that is, dry hot air is supplied into the ring system shell, and the sludge inside is heated and dried by heat exchange between the dry hot air and the furnace of the drying device 400, and the dry cold air obtained after the heat exchange escapes from the dry cold air outlet 403 on the drying device 400, and a part of the dry cold air is discharged through the circulating air inlet 404 on the drying device 400. The gas entering the furnace of the drying device 400 is in direct contact with the sludge for heat exchange, thereby maximizing the thermal efficiency of the system and the drying efficiency of the drying device 400. The gas exiting the furnace of the drying device 400 directly enters the tail gas treatment device (the tail gas treatment system commonly used for sludge pyrolysis in the prior art) and is discharged after being treated to meet the standards. The inlet temperature of the drying hot air is 200-400°C, the outlet temperature of the drying cold air is 200-300°C, the furnace outlet gas temperature is 80-150°C, and the material residence time is 40-120min.

[0050] According to an embodiment of the present invention, referring to Figure 2 , at least one of the pre-pyrolysis device 500 and the pyrolysis device 600 is the pyrolysis device described above, the feed port 501 on the pre-pyrolysis device 500 is connected to the dried sludge outlet 402, the feed port 601 on the pyrolysis device 600 is connected to the pre-pyrolysis material outlet 502 on the pre-pyrolysis device 500, and is suitable for sequentially supplying the dried sludge obtained by the drying device 400 to the pre-pyrolysis device 500 and the pyrolysis device 600 for processing. Preferably, the pre-pyrolysis device 500 and the pyrolysis device 600 are both pyrolysis devices of the above structure.

[0051] Specifically, the pre-pyrolysis hot air enters the high-temperature hot air channel 51 of the pre-pyrolysis device 500 through the high-temperature hot air inlet 503 on the pre-pyrolysis device 500, flows along the spiral baffle plate therein, and the dried sludge enters the pre-pyrolysis device 500 through the feed port 501 on the pre-pyrolysis device 500 and is pushed forward by the spiral blades. The supplied pre-pyrolysis hot air exchanges heat indirectly with the inner cylinder, and the moisture in the sludge is further reduced. Finally, it is discharged from the pre-pyrolysis material outlet 502 on the pre-pyrolysis device 500 and supplied to the pyrolysis device 600 through the feed port 601 on the pyrolysis device 600. After the heat exchange, the hot air outlet 502 on the pre-pyrolysis device 500 is discharged. 04 is connected to the drying device 400, that is, the hot air after heat exchange escapes from the hot air outlet 504 after heat exchange on the pre-pyrolysis device 500 and is supplied to the ring system shell on the drying device 400 as drying hot air. A very small part of the sludge is pyrolyzed in the pre-pyrolysis device 500 to produce a trace amount of pyrolysis oil and gas and is discharged from the pyrolysis oil and gas outlet 505 on the pre-pyrolysis device 500. The gas in the pyrolysis oil and gas is mainly CO2 and contains some VOCs. Among them, the high-temperature hot air inlet temperature of the pre-pyrolysis device 500 is: 500-650℃, the hot air outlet temperature after heat exchange is: 250-450℃, and the material residence time is: 40-120min. The pre-pyrolysis material obtained by the pre-pyrolysis device 500 is discharged from the material outlet 502 on the pre-pyrolysis device 500 and enters the pyrolysis device 600 through the feed port 601 on the pyrolysis device 600. The high-temperature hot air enters the high-temperature hot air channel 61 of the pyrolysis device 600 through the high-temperature hot air inlet 602 on the pyrolysis device 600, flows along the spiral baffle plate therein, and completes pyrolysis in the pyrolysis device 600. The pyrolysis oil and gas generated are discharged through the pyrolysis oil and gas outlet 603 thereon. The pyrolysis carbon is discharged from the pyrolysis carbon outlet 604 of the pyrolysis device 600 and enters the sealed water-cooled spiral (conventional equipment, not shown). After cooling, The charcoal is transported into a charcoal bin (conventional equipment, not shown) for standby use. The hot air outlet 605 after heat exchange on the pyrolysis device 600 is connected to the high-temperature hot air inlet 503 on the pre-pyrolysis device 500, that is, the hot air after heat exchange obtained by the high-temperature hot air channel 61 is discharged through the hot air outlet 605 after heat exchange on the pyrolysis device 600 and then supplied to the pre-pyrolysis device 500 for use as pre-pyrolysis hot air, wherein the temperature of the high-temperature hot air in the pyrolysis device 600 is: 700-900°C, the temperature of the hot air after heat exchange is: 500-650°C; the material residence time is: 40-90min, and the shaft temperature is: 450-600°C.

[0052] According to an embodiment of the present invention, referring to Figure 2The hot blast furnace 700 has a burner 71, a pyrolysis oil and gas inlet 701, a fuel inlet 702, a primary air inlet 703 and a combustion flue gas outlet 704. The pyrolysis oil and gas inlet 701 is connected to the pyrolysis oil and gas outlet 603 on the pyrolysis device 600, and is suitable for supplying the pyrolysis oil and gas obtained by the above-mentioned pyrolysis device 600 to the hot blast furnace 700 to mix with the fuel and the primary air for combustion to obtain combustion flue gas. At the same time, the burner 71 adjusts the fuel consumption based on the temperature of the combustion flue gas outlet 704 and provides a long-lasting flame for the system. The combustion flue gas outlet 704 is connected to the high-temperature hot air inlet 602 on the pyrolysis device 600, that is, the combustion flue gas obtained by the hot blast furnace 700 enters the high-temperature hot air channel 61 of the pyrolysis device 600 through the high-temperature hot air inlet 602 on the pyrolysis device 600. At the same time, the dry cold air outlet 403 on the drying device 400 is connected to the hot air stove 700, that is, another part of the dry cold air obtained in the drying device 400 is supplied to the hot air stove 700 to participate in combustion.

[0053] According to the system for treating sludge of an embodiment of the present invention, the sludge is dried and then sequentially supplied to a pre-pyrolysis device and a pyrolysis device for treatment, and at least one of the pre-pyrolysis device and the pyrolysis device adopts the above-mentioned pyrolysis equipment with better dynamic sealing effect and higher pyrolysis efficiency, thereby improving the pyrolysis efficiency of the sludge. The pyrolysis oil and gas obtained in the pyrolysis device is then supplied to a hot blast furnace to be mixed with fuel and primary air for combustion, and the generated combustion flue gas is supplied to the pyrolysis device for utilization, thereby reducing the energy consumption of the system.

[0054] Further, refer to Figure 3 The system further includes: a water washing device 800, the water washing device 800 has a gas inlet 801 to be purified and a purified gas outlet 802, the pyrolysis oil and gas outlet 505 on the pre-pyrolysis device 500 is connected to the gas inlet 801 to be purified, and the purified gas outlet 802 is connected to the primary air inlet 703, and is suitable for washing the trace pyrolysis oil and gas obtained in the pre-pyrolysis device 500 with water, and the purified gas is discharged and enters the primary air duct of the hot air furnace 700 through the primary air inlet 703, and finally enters the hot air furnace 700 for combustion, so that VOCs are completely decomposed, the processing difficulty of the exhaust gas treatment system is reduced, and it is beneficial to reduce environmental protection indicators.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A pyrolysis device, characterized in that: include: An inner cylinder, wherein one end of the inner cylinder is provided with a feed inlet, and the other end of the inner cylinder is provided with a pyrolysis carbon outlet and a pyrolysis oil and gas outlet; A rotating shaft, the rotating shaft is rotatably arranged, and the rotating shaft extends into the inner cylinder from one end of the inner cylinder along the length direction of the inner cylinder, the rotating shaft is provided with a spiral blade and a heating element, and the spiral blade is provided with a soft contact element; An outer cylinder, wherein the outer cylinder is sleeved on the inner cylinder, and a high-temperature hot air channel is formed between the inner cylinder and the outer cylinder, a high-temperature hot air inlet is provided at one end of the outer cylinder, and a hot air outlet after heat exchange is provided at the other end of the outer cylinder; One spiral turn of the spiral blade is a segment, the soft contact member is arranged between two adjacent segments, and a plurality of the soft contact members are arranged between the two adjacent segments; The lowest end of the soft contact piece contacts the wall of the inner cylinder; The soft contact member comprises a chain; The distance between the spiral blade and the inner cylinder is 15-50 mm.

2. The pyrolysis device according to claim 1, characterized in that The heating element comprises a resistance wire, the rotating shaft is hollow to form a cavity, and the resistance wire is accommodated in the cavity.

3. A system for treating sludge, characterized in that: include: A drying device, the drying device having a sludge inlet and a dried sludge outlet; A pre-pyrolysis device and a pyrolysis device, wherein at least one of the pre-pyrolysis device and the pyrolysis device is the pyrolysis equipment according to any one of claims 1 to 2, wherein the feed port on the pre-pyrolysis device is connected to the dry sludge outlet, and the feed port on the pyrolysis device is connected to the pre-pyrolysis material outlet on the pre-pyrolysis device; A hot blast furnace, the hot blast furnace having a burner, a pyrolysis oil and gas inlet, a fuel inlet, a primary air inlet and a combustion smoke outlet, the pyrolysis oil and gas inlet is connected to the pyrolysis oil and gas outlet on the pyrolysis device, and the combustion smoke outlet is connected to the pyrolysis device.

4. The system according to claim 3, characterized in that The pre-pyrolysis device and the pyrolysis device are both pyrolysis equipment according to any one of claims 1 to 2, the combustion flue gas outlet is connected to the high-temperature hot air inlet on the pyrolysis device, the hot air outlet after heat exchange on the pyrolysis device is connected to the high-temperature hot air inlet on the pre-pyrolysis device, the hot air outlet after heat exchange on the pre-pyrolysis device is connected to the drying device, and the dry cold air outlet on the drying device is respectively connected to the hot air furnace and the circulating air inlet on the drying device.

5. The system according to claim 4, characterized in that Further including: A water washing device, wherein the water washing device has an inlet for gas to be purified and an outlet for purified gas, the pyrolysis oil gas outlet on the pre-pyrolysis device is connected to the inlet for gas to be purified, and the outlet for purified gas is connected to the primary air inlet.

Images