Energy-saving device for rotary kiln of pulverized coal pyrolysis

Abstract

This utility model discloses an energy-saving device for a rotary kiln in pulverized coal pyrolysis, relating to the field of rotary kiln technology. The utility model includes a silo and a rotary kiln body for pulverized coal pyrolysis. The rotary kiln body includes an outer wall, an insulation layer, and an inner liner. It also includes a feeding assembly connected to the silo, used to uniformly transport pulverized coal from the silo to the inner liner of the kiln. The feeding assembly includes a feeding pipe. This utility model utilizes a baffle plate, specifically, to guide hot air towards the bottom pulverized coal contact area. This allows high-temperature hot air that might otherwise escape to directly participate in the pyrolysis reaction and synergistically transfer heat with the radiant tubes, reducing hot air wastage. Simultaneously, it balances the heat load of the radiant tubes, avoiding ineffective energy consumption due to localized overheating or insufficient heat transfer. This maximizes the conversion of heat generated by the hot air furnace into the energy required for pulverized coal pyrolysis, reducing the energy input per unit of pulverized coal pyrolysis.

Description

Technical Field

[0001] This utility model belongs to the field of rotary kiln technology, and in particular relates to an energy-saving device for a pulverized coal pyrolysis rotary kiln. Background Technology

[0002] In the pulverized coal pyrolysis process, the pulverized coal pyrolysis rotary kiln is the core equipment for realizing high-temperature pyrolysis of pulverized coal and generating pyrolysis gas and solid products (such as semi-coke). Its energy utilization efficiency and operational stability directly determine the production cost and product quality of the entire process. However, in the actual operation of traditional pulverized coal pyrolysis rotary kilns, due to structural design defects, there are two major problems: inefficient utilization of hot air energy and imbalance of radiant tube heat load. These problems seriously restrict the energy-saving and economic efficiency of the process. Therefore, an energy-saving device for pulverized coal pyrolysis rotary kilns is proposed. Utility Model Content

[0003] The purpose of this invention is to provide an energy-saving device for a rotary kiln in pulverized coal pyrolysis. By setting up a baffle plate, specifically, the baffle plate guides hot air to concentrate in the bottom pulverized coal contact area, allowing the high-temperature hot air that might otherwise escape to directly participate in the pyrolysis reaction and cooperate with the radiant tubes for heat transfer, reducing hot air waste. At the same time, it balances the heat load of the radiant tubes, avoiding ineffective energy consumption caused by local overheating or insufficient heat transfer, and maximizing the conversion of the heat generated by the hot blast stove into the energy required for pulverized coal pyrolysis. This reduces the energy input per unit of pulverized coal pyrolysis, solving the two core problems of inefficient hot air energy utilization and unbalanced radiant tube heat load that are commonly found in traditional rotary kilns in actual operation due to structural design defects. These problems severely restrict the energy efficiency and economy of the process.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to an energy-saving device for a rotary kiln of pulverized coal pyrolysis, comprising a silo and a rotary kiln body. The rotary kiln body includes an outer wall, an insulation layer, and an inner liner. It also includes a feeding assembly connected to the silo for uniformly conveying pulverized coal from the silo into the inner liner of the kiln. The feeding assembly includes a feeding pipe with a motor mounted on one side. The motor output is connected to a rotating shaft passing through the feeding pipe, and the outer surface of the rotating shaft is provided with helical blades. A heating assembly is also included, which cooperates with the rotary kiln body. The heating system provides the necessary heat for pulverized coal pyrolysis. The heating assembly includes a vertical furnace, a hot air furnace, and a hot air flue chamber. A radiant tube extending into the inner lining of the pulverized coal pyrolysis rotary kiln is installed inside the hot air flue chamber. A flue gas treatment and recovery assembly is connected to the pulverized coal pyrolysis rotary kiln body and is used to collect the flue gas generated during pyrolysis and recover heat. The flue gas treatment and recovery assembly includes a kiln head flue gas collection hood. A baffle plate is installed inside the kiln head flue gas collection hood, and the baffle plate is connected to the inner wall of the kiln head flue gas collection hood via a baffle plate support rod. A flue gas outlet after heat exchange is provided on one side of the kiln head flue gas collection hood.

[0005] Furthermore, a nitrogen-filling valve is installed on the feed pipe, which is used to introduce nitrogen into the feed pipe and the interior of the pulverized coal pyrolysis rotary kiln to create an inert environment.

[0006] Furthermore, a rotary kiln drive device is provided on one side of the outer wall of the pulverized coal pyrolysis rotary kiln body. The rotary kiln drive device is used to drive the pulverized coal pyrolysis rotary kiln body to rotate, so that the pulverized coal in the inner liner of the pulverized coal pyrolysis rotary kiln is evenly turned.

[0007] Furthermore, a kiln tail hood is provided at one end of the pulverized coal pyrolysis rotary kiln body, and a star-shaped discharge valve is installed below the kiln tail hood. The star-shaped discharge valve is used to quantitatively discharge the solid products generated after pulverized coal pyrolysis.

[0008] Furthermore, the rotary kiln body for pulverized coal pyrolysis is provided with a pyrolysis gas outlet, which is connected to the inner liner of the rotary kiln for venting the pyrolysis gas generated during the pulverized coal pyrolysis process.

[0009] Furthermore, the hot blast stove is connected to the hot blast flue, and the high-temperature hot air generated by the hot blast stove can enter the radiant tube through the hot blast flue to provide heat for the pyrolysis of pulverized coal.

[0010] Furthermore, the baffle plate can adjust the flow direction and speed of the flue gas inside the kiln head flue gas collection hood, improve the flue gas collection efficiency, and achieve flue gas heat recovery in conjunction with the flue gas outlet after heat exchange.

[0011] This utility model has the following beneficial effects: 1. This utility model, by setting up a baffle plate, specifically guides the hot air to concentrate in the bottom coal contact area, so that the high-temperature hot air that might otherwise escape directly participates in the pyrolysis reaction and cooperates with the radiant tube for heat transfer, reducing the waste of hot air. At the same time, it balances the heat load of the radiant tube, avoids the ineffective energy consumption caused by local overheating or insufficient heat transfer, and maximizes the conversion of the heat generated by the hot air furnace into the energy required for coal pyrolysis, thereby reducing the energy input per unit of coal pyrolysis.

[0012] 2. This utility model, through the design of the feeding assembly, specifically the spiral blades in the feeding stage, avoids local accumulation or uneven conveying of pulverized coal in the rotary kiln, ensuring uniform heating of the pulverized coal, guaranteeing stable pyrolysis reaction, reducing fluctuations in product composition caused by uneven raw material distribution, and improving the quality stability of pyrolysis products. At the same time, the inert environment created by the nitrogen-filled valve and the reasonable control of flue gas flow by the baffle plate can effectively prevent the oxidation and combustion of pulverized coal, reduce safety risks in the production process, and provide a guarantee for the long-term stable operation of the equipment.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the feed pipe of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the kiln head flue gas collection hood of this utility model; Figure 4 This is a schematic diagram of the overall structure of the windbreak panel of this utility model; Figure 5 This utility model Figure 4 A magnified structural diagram of A in the diagram.

[0016] The attached diagram lists the components represented by each number as follows: 1. Hopper; 2. Feeding assembly; 211. Feeding pipe; 212. Motor; 213. Rotary shaft; 214. Spiral blades; 3. Nitrogen charging valve; 4. Flue gas outlet after heat exchange; 5. Kiln head flue gas collection hood; 6. Outer wall of pulverized coal pyrolysis rotary kiln body; 611. Insulation layer of pulverized coal pyrolysis rotary kiln; 612. Inner liner of pulverized coal pyrolysis rotary kiln; 7. Rotary kiln drive unit; 8. Radiant tube; 9. Hot air chamber; 10. Kiln tail hood; 11. Vertical furnace; 12. Rotary discharge valve; 13. Hot air furnace; 14. Pyrolysis gas outlet; 15. Baffle plate; 16. Baffle plate support rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-5As shown, this utility model is an energy-saving device for a pulverized coal pyrolysis rotary kiln, including a silo 1 and a pulverized coal pyrolysis rotary kiln body. The pulverized coal pyrolysis rotary kiln body includes an outer wall 6, a thermal insulation layer 611, and an inner liner 612. It also includes a feeding assembly 2 connected to the silo 1, used to evenly transport the pulverized coal in the silo 1 to the inner liner 612. The feeding assembly 2 includes a feeding pipe 211, a motor 212 installed on one side of the feeding pipe 211, and a rotating shaft 213 connected to the output end of the motor 212, which passes through the feeding pipe 211. Spiral blades 214 are provided on the outer surface of the rotating shaft 213. A heating assembly is also included, which cooperates with the pulverized coal pyrolysis rotary kiln body to provide heating for pulverized coal pyrolysis. The required heat is supplied by a heating system including a vertical furnace 11, a hot air furnace 13, and a hot air flue chamber 9. The hot air flue chamber 9 contains radiant tubes 8 extending into the inner liner 612 of the pulverized coal pyrolysis rotary kiln. A flue gas treatment and recovery system is connected to the pulverized coal pyrolysis rotary kiln body to collect the flue gas generated during pyrolysis and recover heat. This system includes a kiln head flue gas collection hood 5, inside which is a baffle plate 15. The baffle plate 15 is connected to the inner wall of the kiln head flue gas collection hood 5 via a baffle plate support rod 16. A flue gas outlet 4 after heat exchange is located on one side of the kiln head flue gas collection hood 5. The baffle plate 15 guides the hot air towards the bottom pulverized coal contact area, allowing the high-temperature hot air that might otherwise escape to directly participate in the heat exchange. The pyrolysis reaction and radiant tubes work together to transfer heat, reducing hot air waste. Simultaneously, the heat load on the radiant tubes 8 is balanced, avoiding ineffective energy consumption caused by localized overheating or insufficient heat transfer. This maximizes the conversion of heat generated by the hot blast stove 13 into the energy required for pulverized coal pyrolysis, reducing the energy input per unit of pulverized coal pyrolysis. In the feeding stage, the spiral blades 214 are designed for uniform conveying, preventing localized accumulation or uneven conveying of pulverized coal within the rotary kiln. This ensures uniform heating of the pulverized coal, guarantees stable pyrolysis, reduces fluctuations in product composition due to uneven raw material distribution, and improves the quality stability of the pyrolysis products. Furthermore, the inert environment created by nitrogen introduced through the nitrogen purging valve 3 and the reasonable control of flue gas flow by the baffle plate 15 effectively prevent pulverized coal oxidation and combustion. To reduce safety risks during production and ensure the long-term stable operation of the equipment, a nitrogen-filling valve 3 is installed on the feed pipe 211. This valve introduces nitrogen into the feed pipe 211 and the inner liner 612 of the pulverized coal pyrolysis rotary kiln, creating an inert environment. A rotary kiln drive device 7 is installed on one side of the outer wall 6 of the pulverized coal pyrolysis rotary kiln body. This drive device 7 rotates the kiln body, causing the pulverized coal inside the inner liner 612 to tumble evenly. A kiln tail hood 10 is installed at one end of the kiln body, and a star-shaped discharge valve 12 is installed below it. This valve quantitatively discharges the solid products generated after pulverized coal pyrolysis. A pyrolysis gas outlet 14 is provided on the pulverized coal pyrolysis rotary kiln body.The pyrolysis gas outlet 14 is connected to the inner liner 612 of the rotary kiln for pulverized coal pyrolysis, used to export the pyrolysis gas generated during the pulverized coal pyrolysis process. The hot blast stove 13 is connected to the hot blast chamber 9, allowing the high-temperature hot air generated by the hot blast stove 13 to enter the radiant tube 8 through the hot blast chamber 9, providing heat for pulverized coal pyrolysis. The baffle plate 15 can adjust the flow direction and speed of the flue gas within the kiln head flue gas collection hood 5, improving flue gas collection efficiency, and working in conjunction with the heat-exchanged flue gas outlet 4 to achieve flue gas heat recovery.

[0019] One specific application of this embodiment is as follows: During use, pulverized coal is first stored in silo 1. Motor 212 drives shaft 213 to rotate, which in turn drives spiral blades 214 to stably and evenly transport the pulverized coal into the pulverized coal pyrolysis rotary kiln. At the same time, nitrogen purging valve 3 is opened, and nitrogen is introduced into the feed pipe 211 and the interior of the rotary kiln to create an inert environment. This prevents the pulverized coal from oxidizing due to contact with air during transportation and pyrolysis, ensuring the safety of the pyrolysis process and the purity of the product. The pulverized coal enters the... After the rotary kiln body, consisting of the outer wall 6, insulation layer 611, and inner liner 612, is formed, the rotary kiln drive device 7 drives the rotary kiln body to rotate, causing the pulverized coal to tumble evenly within the inner liner 612, ensuring sufficient heating. The heating system consists of a vertical furnace 11, a hot air furnace 13, a hot air chamber 9, and radiant tubes 8. The high-temperature hot air generated by the hot air furnace 13 enters the hot air chamber 9, and some of the heat is directly transferred through the radiant tubes 8. Radiation is transferred to the pulverized coal inside the rotary kiln 612 for pulverized coal pyrolysis. Another part of the hot air, together with the heat from the vertical furnace 11, provides a stable high-temperature environment for pulverized coal pyrolysis, meeting the temperature conditions required for pulverized coal pyrolysis and promoting the pyrolysis reaction of pulverized coal to generate pyrolysis gas. The flue gas generated during the pyrolysis process is collected by the kiln head flue gas collection hood 5. The baffle plate 15 inside the kiln head flue gas collection hood 5 can adjust the flow direction and speed of the flue gas to improve the collection efficiency. The collected flue gas enters the heat exchange system and exchanges heat with the medium that needs to be preheated to achieve heat recovery. The flue gas after heat exchange is discharged through the heat exchange flue gas outlet 4. At the same time, the pyrolysis gas generated by pyrolysis is discharged through the pyrolysis gas outlet 14 and can be used as fuel to heat the blast furnace 13 and other equipment to further improve the energy utilization rate. The solid products such as semi-coke generated after the pyrolysis reaction are completed are transported to the kiln tail under the rotation of the rotary kiln and discharged from the system stably and quantitatively through the star-shaped unloading valve 12 to complete the entire pulverized coal pyrolysis process. The device achieves centralized heat transfer and efficient utilization through the coordinated design of heating components such as hot air furnace 13 and radiant tube 8, reducing heat loss during the heating process. On the other hand, the kiln head flue gas collection hood 5 and heat exchange system are set up to recover heat from the high-temperature flue gas generated by pyrolysis. The recovered heat is used to preheat raw materials or combustion air. At the same time, the pyrolysis gas generated by pyrolysis can be recycled as secondary fuel, reducing dependence on external energy. The dual energy-saving design significantly reduces the energy consumption per unit of pulverized coal pyrolysis, thereby reducing the energy cost of the enterprise's production process.

[0020] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A coal powder pyrolysis rotary kiln energy-saving device, comprising a bunker (1) and a coal powder pyrolysis rotary kiln body, the coal powder pyrolysis rotary kiln body comprising a coal powder pyrolysis rotary kiln body outer wall (6), a coal powder pyrolysis rotary kiln insulation layer (611), and a coal powder pyrolysis rotary kiln inner liner (612), characterized in that, Also includes: Feeding assembly (2), which is connected to silo (1) and is used to uniformly transport pulverized coal in silo (1) to the inner liner (612) of pulverized coal pyrolysis rotary kiln. The feeding assembly (2) includes a feeding pipe (211). A motor (212) is installed on one side of the feeding pipe (211). The output end of the motor (212) is connected to a rotating shaft (213) that passes through the feeding pipe (211). Spiral blades (214) are provided on the outer surface of the rotating shaft (213). The heating component is used in conjunction with the main body of the pulverized coal pyrolysis rotary kiln to provide the required heat for pulverized coal pyrolysis. The heating component includes a vertical furnace (11), a hot air furnace (13) and a hot air flue (9). The hot air flue (9) is provided with a radiant tube (8) extending into the inner liner (612) of the pulverized coal pyrolysis rotary kiln. A flue gas treatment and recovery component is connected to the main body of the pulverized coal pyrolysis rotary kiln and is used to collect the flue gas generated during the pyrolysis process and recover heat. The flue gas treatment and recovery component includes a kiln head flue gas collection hood (5). A baffle plate (15) is provided inside the kiln head flue gas collection hood (5). The baffle plate (15) is connected to the inner wall of the kiln head flue gas collection hood (5) through a baffle plate support rod (16). A flue gas outlet (4) after heat exchange is provided on one side of the kiln head flue gas collection hood (5).

2. The energy saving device for coal powder pyrolysis rotary kiln according to claim 1, characterized in that, A nitrogen-filling valve (3) is installed on the feed pipe (211). The nitrogen-filling valve (3) is used to introduce nitrogen into the feed pipe (211) and the inner liner (612) of the pulverized coal pyrolysis rotary kiln to create an inert environment.

3. The energy saving device for coal powder pyrolysis rotary kiln according to claim 1, characterized in that, A rotary kiln drive device (7) is provided on one side of the outer wall (6) of the pulverized coal pyrolysis rotary kiln body. The rotary kiln drive device (7) is used to drive the pulverized coal pyrolysis rotary kiln body to rotate, so that the pulverized coal in the inner liner (612) of the pulverized coal pyrolysis rotary kiln is evenly turned over.

4. The coal powder pyrolysis rotary kiln energy-saving device according to claim 1, characterized in that, A kiln tail cover (10) is provided at one end of the pulverized coal pyrolysis rotary kiln body, and a star-shaped discharge valve (12) is installed below the kiln tail cover (10). The star-shaped discharge valve (12) is used to discharge the solid products generated after pulverized coal pyrolysis in a quantitative manner.

5. The coal powder pyrolysis rotary kiln energy-saving device according to claim 1, characterized in that, The pulverized coal pyrolysis rotary kiln body is provided with a pyrolysis gas outlet (14), which is connected to the inner liner (612) of the pulverized coal pyrolysis rotary kiln and is used to export the pyrolysis gas generated during the pulverized coal pyrolysis process.

6. The energy-saving device for a rotary kiln in pulverized coal pyrolysis according to claim 1, characterized in that, The hot air furnace (13) is connected to the hot air flue (9), and the high-temperature hot air generated by the hot air furnace (13) can enter the radiant tube (8) through the hot air flue (9) to provide heat for the pyrolysis of pulverized coal.

7. The coal powder pyrolysis rotary kiln energy-saving device according to claim 1, characterized in that, The baffle plate (15) can adjust the flow direction and speed of the flue gas in the kiln head flue gas collection hood (5), improve the flue gas collection efficiency, and cooperate with the flue gas outlet (4) after heat exchange to realize the recovery of flue gas heat.

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