A waste pyrolysis furnace

Abstract

The present invention discloses a waste pyrolysis furnace, which includes a furnace body, a rotary furnace, a coating device and a driving device. The furnace body has a heating chamber; the rotary furnace is rotatably arranged in the heating chamber, and a feed inlet and a discharge outlet are respectively arranged at both ends of the rotary furnace. The rotary furnace is inclined, and the feed inlet is higher than the discharge outlet. A plurality of film hanging frames are circumferentially arranged on the inner wall of the rotary furnace; the coating device is fixedly connected to the furnace body, and the coating device is located in the inner cavity of the rotary furnace and is used for transitioning the waste falling off from the upper part of the rotary furnace; the driving device is connected to the rotary furnace and is used for driving the rotary furnace to rotate. The heat transfer area utilization rate of the present invention is high, the heat conduction speed is fast and uniform, the pyrolysis efficiency is high, and the equipment volume is smaller under the condition of processing the same amount of waste.

Description

Technical Field

[0001] The present invention relates to the technical field of waste treatment equipment, and in particular to a waste pyrolysis furnace. Background Art

[0002] With the increasing environmental protection requirements for waste disposal, new disposal technologies such as pyrolysis disposal technology have been developed and applied more and more. The principle of pyrolysis is that in an oxygen-free sealed pyrolysis furnace, it is indirectly heated to above 300 °C and then starts to pyrolyze and release combustible gas. After heating to 350 - 600 °C (the pyrolysis temperature is determined according to the material characteristics), it reaches the working temperature. The organic matter in the waste pyrolyzes and volatilizes into combustible gas. The combustible gas output from the pyrolysis furnace is then input into a hot blast stove for combustion. Its flue gas has a high temperature, complete combustion, and the generated high-temperature flue gas is transported to a heating furnace outside the pyrolysis furnace jacket to indirectly heat the pyrolysis furnace. The excess pyrolysis gas can be used for waste heat utilization. The solid product after pyrolysis is mainly fixed carbon, which can be used as solid fuel and carbon materials to achieve resource utilization. Due to oxygen-free pyrolysis, there is no combustion, and the generation of dioxins is eliminated. Compared with the incineration disposal process, the pyrolysis disposal process is more environmentally friendly and has a high level of resource utilization.

[0003] With the development of pyrolysis disposal technology, preliminary results have also been achieved in the research, design, and manufacturing development of pyrolysis furnace equipment. Currently, the pyrolysis furnace mainly consists of a rotary pyrolysis furnace. However, although the existing rotary pyrolysis furnace has a simple structure, its heat transfer area utilization rate is very low, its thermal conductivity is poor, the pyrolysis speed is slow and uneven, resulting in low pyrolysis efficiency and a large equipment size. Summary of the Invention

[0004] An object of the present invention is to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a waste pyrolysis furnace with a high heat transfer area utilization rate, a fast and uniform heat conduction speed, a high pyrolysis efficiency, and a smaller equipment volume under the same amount of waste to be processed.

[0005] A waste pyrolysis furnace according to an embodiment of the present invention includes: a furnace body having a heating chamber; a rotary furnace rotatably disposed in the heating chamber, with a feed port and a discharge port respectively provided at both ends of the rotary furnace. The rotary furnace is inclined, and the feed port is higher than the discharge port. A plurality of film hanging racks are circumferentially provided on the inner wall of the rotary furnace; a film coating device fixedly connected to the furnace body, the film coating device being located in the inner cavity of the rotary furnace, and the film coating device being used to form a thin film from the waste that falls off from the upper part of the rotary furnace; a driving device connected to the rotary furnace, the driving device being used to drive the rotary furnace to rotate.

[0006] The above technical scheme has at least the following beneficial effects: the waste material rotating with the rotary kiln reaches the upper part of the rotary kiln, falls off onto the coating device, and forms a thin and uniform waste film after being coated by the coating device. The waste film slides to the lower part of the rotary kiln and is hung on the film hanging rack and continues to rotate with the rotary kiln. Compared with the prior art, the space occupied by the waste film on the inner wall of the rotary kiln is increased, the heated area is increased, and the thin and uniform waste film has fast heat conduction, which effectively improves the pyrolysis efficiency and pyrolysis effect, thereby greatly increasing the waste processing capacity. Therefore, the equipment is smaller in size and reduces the operating cost under the same waste processing capacity.

[0007] According to some embodiments of the present invention, a plurality of film hanging racks are evenly arranged on the inner wall of the rotary furnace in a circumferential direction.

[0008] According to some embodiments of the present invention, the film hanging rack is arranged to be inclined toward the rotation direction of the rotary kiln.

[0009] According to some embodiments of the present invention, the film coating device includes a mounting frame and a film coating plate, the mounting frame is fixedly connected to the furnace body, the film coating plate is fixed to the mounting frame, and the film coating plate is tilted.

[0010] According to some embodiments of the present invention, the film-coated board has a double-layer structure, including an upper film-coated board and a lower film-coated board, and the upper film-coated board and the lower film-coated board are parallel.

[0011] According to some embodiments of the present invention, the angle between the film-coated plate and the horizontal plane is 30° to 60°.

[0012] According to some embodiments of the present invention, a furnace is formed between the outer wall of the rotary kiln close to the coated plate and the inner wall of the heating chamber, and the outer wall of the rotary kiln away from the coated plate is in contact with the inner wall of the heating chamber.

[0013] According to some embodiments of the present invention, a heat insulating layer is provided between an outer wall of the rotary kiln on a side facing away from the film-coated plate and an inner wall of the heating chamber.

[0014] According to some embodiments of the present invention, the furnace body is provided with a smoke inlet and a smoke outlet, the smoke inlet is located at one end close to the discharge port, the smoke outlet is located at one end close to the feed port, and the smoke inlet and the smoke outlet are both connected to the furnace.

[0015] According to some embodiments of the present invention, a discharge box is further included, wherein the discharge box is sealed and connected to the discharge port, and the discharge box is provided with an air outlet and a material drop port, wherein the air outlet and the material drop port are both used to discharge the pyrolysis products.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a first visual structural schematic diagram of a waste pyrolysis furnace in an embodiment of the present invention;

[0019] Figure 2 is a second visual structural schematic diagram of a waste pyrolysis furnace in an embodiment of the present invention;

[0020] Figure 3 is Figure 1 an enlarged view of M in

[0021] Figure 4 is a cross-sectional view of a waste pyrolysis furnace in an embodiment of the present invention.

[0022] Reference numerals:

[0023] Furnace body 100, heating chamber 110, furnace chamber 111, heat insulation layer 112, flue gas inlet 120, flue gas outlet 130;

[0024] Rotary furnace 200, feed inlet 210, discharge outlet 220, film hanging rack 230;

[0025] Coating device 300, mounting rack 310, coating plate 320, upper coating plate 321, lower coating plate 322;

[0026] Driving device 400, motor 410, driving gear 411, transmission gear 420, idler wheel group 430;

[0027] Discharge box 500, gas outlet 510, blanking port 520. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be construed as a limitation on the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that with respect to the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0030] In the description of the present invention, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more. Understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, and understandings such as "above", "below", "within", etc. include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0032] Refer to Figures 1 to 4, an embodiment of the present invention provides a waste pyrolysis furnace, which includes a furnace body 100, which is a columnar structure arranged horizontally. A heating cavity 110 with a crossbeam is arranged in the middle of the furnace body 100. A rotary furnace 200 is rotatably installed in the heating cavity 110. The rotary furnace 200 rotates counterclockwise. Both ends of the rotary furnace 200 extend out of the heating cavity 110 respectively, and both ends of the rotary furnace 200 are supported by a supporting wheel set 430 respectively to realize the free rotation of the rotary furnace 200. A transmission gear 420 is arranged outside the left end of the rotary furnace 200. The transmission gear 420 meshes with a driving gear 411 arranged on the output shaft of a driving motor 410. The driving motor 410 is the driving device 400. Thus, the rotary furnace 200 can be driven to rotate by the driving motor 410 to realize continuous pyrolysis of waste, and the pyrolysis time can be adjusted by adjusting the rotation speed of the driving motor 410. The pyrolysis time is determined by the properties of the waste. A feed inlet 210 is arranged at the left end of the rotary furnace 200, and a discharge outlet 220 is arranged at the right end. The rotary furnace 200 is inclined, that is, the rotation center line of the rotary furnace 200 forms an angle with the horizontal plane, and the feed inlet 210 of the rotary furnace 200 is higher than the discharge outlet 220, that is, the left end is higher than the right end, so as to convey the pyrolyzed product to the discharge outlet 220 for output while pyrolyzing the waste. The value of the angle is 1.2°, and the size of the angle can be adjusted according to actual needs to change the axial movement speed of the waste. A coating device 300 is arranged in the rotary furnace 200. The coating device 300 is fixedly connected with the furnace body 100. When the rotary furnace 200 rotates, the coating device 300 remains stationary. Specifically, the coating device 300 includes a mounting frame 310 and a coating plate 320. The mounting frame 310 is fixed to the furnace body 100. The coating plate 320 is a double-layer structure, including an upper coating plate 321 and a lower coating plate 322. The upper coating plate 321 and the lower coating plate 322 are fixedly arranged at intervals on the mounting frame 310. The upper coating plate 321 and the lower coating plate 322 are parallel, and the coating plate 320 is inclined. In this embodiment, the rotary furnace 200 rotates counterclockwise, so the right end of the coating plate 320 is higher than the left end of the coating plate 320, that is, the coating plate 320 is located at the lower right corner of the cross-sectional view of the rotary furnace 200 as a whole. The coating plate 320 forms an angle less than 90° with the horizontal plane. It can be understood that if the rotary furnace 200 rotates clockwise, the left end of the coating plate 320 is higher than the right end of the coating plate 320. The double-layer coating plate 320 enables a small part of the waste falling off from the upper part of the rotary furnace 200 to preferentially fall onto the lower coating plate 322, and most of the waste continues to rotate with the rotary furnace 200 for a certain distance and then falls onto the upper coating plate 321 to form waste films respectively, improving the reliability of the coating device 300 to form waste thin films. A plurality of film hanging frames 230 are also circumferentially arranged on the inner wall of the rotary furnace 200. The film hanging frames 230 are plate-like structures extending from the inner wall of the rotary furnace 200 towards the middle. The plurality of film hanging frames 230 are arranged at intervals.

[0033] Working principle: The waste material enters the rotary furnace 200 from the feed inlet 210. The motor 410 drives the rotary furnace 200 to rotate. Axially, with the rotation of the rotary furnace 200, the waste material gradually moves from the feed inlet 210 to the discharge outlet 220. The furnace body 100 indirectly transfers the heat in the heating chamber 110 to the inside of the rotary furnace 200 through the wall of the rotary furnace 200, realizing continuous pyrolysis and outputting pyrolysis products such as solid carbon and pyrolysis gas from the discharge outlet 220; Circumferentially, the waste material rotates counterclockwise with the rotary furnace 200. After reaching near point C, due to gravity, a small part of the waste material falls onto the lower coating plate 320, slides to point B along the lower coating plate 320, forms a waste material film and is hung on the film hanging rack 230 and enters the next rotation cycle with the rotary furnace 200; Most of the waste material continues to rotate with the rotary furnace 200, and the highest point reaches point D. This part of the waste material falls onto the upper coating plate 320, slides to point A along the upper coating plate 320, forms another waste material film and is hung on the film hanging rack 230 and enters the next rotation cycle with the rotary furnace 200. Such a cycle realizes the continuous pyrolysis of the waste material until the waste material is completely pyrolyzed.

[0034] Compared with the prior art, after being coated by the coating plate 320, the formed thin and uniform waste material film occupies an increased circumferential area of the inner wall of the rotary furnace 200, that is, the ABCD section, accounting for about 2 / 3 of the circumferential area. The heating area is increased, and the thin and uniform waste material film has fast heat conduction, effectively improving the pyrolysis efficiency and pyrolysis effect, thus greatly increasing the waste material treatment capacity. Therefore, under the same waste material treatment capacity, the overall volume of the equipment is smaller, reducing the investment cost and the operation cost.

[0035] Refer to Figure 4 , Further, a plurality of film hanging racks 230 are circumferentially and uniformly arranged on the inner wall of the rotary furnace 200, so that the waste material film is uniformly hung on the film hanging racks 230, ensuring uniform heating of the waste material film and improving the pyrolysis effect; At the same time, the film hanging rack 230 is inclined in the rotation direction of the rotary furnace 200, that is, the film hanging rack 230 forms an angle with the virtual radius of the rotary furnace 200 at the position of the film hanging rack 230. In this embodiment, the rotary furnace 200 rotates counterclockwise, and each film hanging rack 230 deviates to the right side of the corresponding virtual radius. It can be understood that if the rotary furnace 200 rotates clockwise, each film hanging rack 230 deviates to the left side of the corresponding virtual radius, so that the waste material film can be firmly hung, and the waste material film can rotate to as high a position as possible before detaching from the film hanging rack 230, which can increase the area of the pyrolyzed waste material film, increase the pyrolysis time, increase the waste material treatment capacity and improve the pyrolysis effect.

[0036] Refer to Figure 4Furthermore, the angle between the coating plate 320 and the horizontal plane is 30° to 60°. Specifically, the angle between the coating plate 320 and the horizontal plane is 45°. Under the premise of ensuring that the waste can slide down the coating plate 320 smoothly, the lower end of the coating plate 320 is as close to the left as possible, that is, the BA section of the ABCD section is extended as much as possible, thereby maximizing the circumferential area of ​​the inner wall of the rotary kiln 200 occupied by the ABCD section, increasing the area of ​​the pyrolysis waste film, and increasing the waste processing capacity.

[0037] Reference Figure 4 Further, a furnace 111 is formed between the outer wall of the rotary kiln 200 on the side close to the coating plate 320 and the inner wall of the heating chamber 110, and the outer wall of the rotary kiln 200 on the side away from the coating plate 320 is in contact with the inner wall of the heating chamber 110, that is, 1 / 4 of the outer wall of the upper left corner of the rotary kiln 200 is in contact with the inner wall of the heating chamber 110, and the other 3 / 4 of the outer wall of the rotary kiln 200 is at an end distance from the inner wall of the heating chamber 110, forming a furnace 111, and the furnace 111 is roughly "L" shaped, so that only the wall of the rotary kiln 200 with the waste film is heated, that is, only the outer wall of the ABCD section is heated, thereby reducing the volume of the furnace 111, further reducing the overall structure of the equipment, and concentrating on heating the wall with the waste film, increasing the effective heating intensity, and improving the pyrolysis effect.

[0038] Reference Figure 4 Furthermore, a heat insulating layer 112 is arranged between the outer wall of the rotary kiln 200 away from the coating plate 320 and the inner wall of the heating chamber 110, that is, a heat insulating layer 112 is arranged between the 1 / 4 outer wall of the upper left corner of the rotary kiln 200 and the inner wall of the heating chamber 110. The heat insulating layer 112 is high temperature resistant aluminum silicate fiber, which can reduce heat loss in the heating chamber 110 and improve heating efficiency.

[0039] Reference Figure 1 and Figure 2 In this embodiment, a smoke inlet 120 and a smoke outlet 130 are respectively provided at both ends of the furnace body 100. The smoke inlet 120 is located at one end close to the discharge port 220, that is, the smoke inlet 120 is located at the right end and at the rear side, and the smoke outlet 130 is located at one end close to the feed port 210, that is, the smoke outlet 130 is located at the left end and at the front side. The smoke inlet 120 and the smoke outlet 130 are both connected to the heating chamber 110. By introducing high-temperature smoke from the smoke inlet 120 and discharging low-temperature smoke from the smoke outlet 130, the heat of the high-temperature smoke is indirectly transferred to the waste through the wall of the rotary furnace 200 to achieve pyrolysis. It can be understood that the flow direction of the high-temperature smoke is opposite to the conveying direction of the material, which is conducive to fully absorbing the heat of the high-temperature smoke and improving the utilization rate of heat.

[0040] Reference Figure 1 and Figure 2, further, since the products after waste pyrolysis include solid carbon, pyrolysis gas, etc., this embodiment further includes a discharge box 500. The discharge box 500 is hermetically connected to the discharge port 220 to ensure that the pyrolysis gas does not leak. An air outlet 510 is provided at the upper end of the discharge box 500, and a blanking port is provided at the lower end. Then, the gaseous products are discharged from the air outlet 510 for further treatment, and the solid products are discharged from the blanking port 520 for further collection, realizing solid-gas separation and separate discharge.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the said technical field, various changes can be made without departing from the gist of the present invention.

Claims

1. A waste pyrolysis furnace, characterized in that, include: A furnace body having a heating chamber; A rotary kiln is rotatably arranged in the heating chamber, a feed port and a discharge port are respectively arranged at two ends of the rotary kiln, the rotary kiln is arranged tilted, and the feed port is higher than the discharge port, a plurality of film hanging racks are circumferentially arranged on the inner wall of the rotary kiln, and the plurality of film hanging racks are evenly arranged on the inner wall of the rotary kiln; A film coating device is fixedly connected to the furnace body, the film coating device is located in the inner cavity of the rotary furnace, the film coating device comprises a mounting frame and a film coating plate, the mounting frame is fixedly connected to the furnace body, the film coating plate is fixed to the mounting frame, the film coating plate is tilted, and the film coating device is used to form a film on the waste material falling off from the upper part of the rotary furnace; A driving device is connected to the rotary kiln, and the driving device is used to drive the rotary kiln to rotate.

2. The waste pyrolysis furnace according to claim 1, wherein: The film hanging rack is arranged to be inclined toward the rotation direction of the rotary kiln.

3. The waste pyrolysis furnace according to claim 1, characterized in that: The film-coated plate is a double-layer structure, comprising an upper film-coated plate and a lower film-coated plate, and the upper film-coated plate and the lower film-coated plate are parallel.

4. A waste pyrolysis furnace according to claim 1 or 3, characterized in that: The angle between the film-coated plate and the horizontal plane is 30° to 60°.

5. The waste pyrolysis furnace according to claim 1, characterized in that: A furnace is formed between the outer wall of the rotary kiln on the side close to the film-coated plate and the inner wall of the heating chamber, and the outer wall of the rotary kiln on the side away from the film-coated plate is in contact with the inner wall of the heating chamber.

6. The waste pyrolysis furnace according to claim 5, wherein: A heat insulation layer is arranged between the outer wall of the rotary kiln on the side away from the coating plate and the inner wall of the heating chamber.

7. A waste pyrolysis furnace according to claim 5, characterized in that: The furnace body is provided with a smoke inlet and a smoke outlet, wherein the smoke inlet is located at one end close to the discharge port, and the smoke outlet is located at one end close to the feed port, and both the smoke inlet and the smoke outlet are connected to the furnace.

8. A waste pyrolysis furnace according to claim 1, characterized in that: It also includes a discharge box, which is sealed with the discharge port. The discharge box is provided with an air outlet and a discharge port, and both the air outlet and the discharge port are used to discharge the pyrolysis products.

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