A low rank coal pyrolysis apparatus

Abstract

The utility model relates to the technical field of pyrolysis low rank coal, and particularly discloses a low rank coal pyrolysis device, which comprises a closed kiln body, a feeding pipe is connected to one side of the closed kiln body, a gas outlet pipe is communicated to the top of the closed kiln body, a discharging pipe is connected to the bottom of the closed kiln body, a high-temperature gas conveying element is installed through the closed kiln body, and a stirring assembly that rotates based on the high-temperature gas conveying element is arranged inside the closed kiln body; the high-temperature gas conveying element comprises a main pipe and a plurality of high-temperature gas pipes, gas outlet holes are arranged on the high-temperature gas pipes, and the gas outlet holes on different high-temperature gas pipes are not on the same plane; the stirring assembly acts on the low rank coal accumulated inside the closed kiln body, and the gas flow of the main pipe drives the stirring assembly to rotate, so that the device solves the problem that the low rank coal cannot fully absorb the heat of high-temperature gas due to the sticking and covering of the low rank coal inside the traditional closed kiln body.

Description

Technical Field

[0001] This application relates to the field of low-rank coal pyrolysis technology, and specifically discloses a low-rank coal pyrolysis device. Background Technology

[0002] Low-rank coal, including lignite, non-caking coal, weakly caking coal, and long-flame coal, occupies an important position in the overall distribution of coal resources in China. Due to its well-developed surface pores and abundant oxygen-containing functional groups, low-rank coal exhibits extremely poor surface hydrophobicity and floatability, which makes it difficult to achieve efficient recovery of its coal slime using conventional flotation reagents and processes. The decomposition technology involves heating low-rank coal under anaerobic or oxygen-deficient conditions, causing complex physical and chemical reactions that transform it into products such as coal gas, tar, and semi-coke. This process not only helps improve the utilization rate of low-rank coal but also enables its high-value, multi-stage utilization. Chinese Patent Publication No. CN204589074U discloses a low-rank coal upgrading pyrolysis device, comprising a sealed kiln body with an inlet and an outlet. A high-temperature gas pipeline is installed inside the kiln body, forming a low-rank coal propulsion and decomposition channel between the high-temperature gas pipeline and the inner wall of the kiln body. A decomposition gas collection pipe connected to the low-rank coal propulsion and decomposition channel is installed on the kiln body. The high-temperature gas pipeline is connected to a high-temperature gas output / input mechanism installed on the surface of the kiln body. This invention, by connecting the high-temperature gas pipeline to the high-temperature gas pipeline via the high-temperature gas output / input mechanism on the surface of the kiln body, allows high-temperature gas to pass through the pipeline. The heat brought by the high-temperature gas is fully absorbed and decomposed by the low-rank coal, which then decomposes into fuel gas, tar gas, and coal with higher calorific value within the low-rank coal propulsion and separation channel. The problem with the above solution is that the low-rank coal inside the sealed kiln has a sticking phenomenon and cannot be fully heated. The heat brought by the high-temperature gas cannot be fully absorbed and decomposed by the low-rank coal. In view of this, the inventor proposes a low-rank coal pyrolysis device. Utility Model Content

[0003] The purpose of this invention is to solve the problem that low-rank coal cannot fully absorb the heat brought by high-temperature gas due to the adhesion phenomenon of low-rank coal inside the traditional closed kiln.

[0004] To achieve the above objectives, this utility model provides the following basic solution: A low-rank coal pyrolysis device includes a closed kiln body, a feed pipe connected to one side of the closed kiln body, a gas outlet pipe connected to the top of the closed kiln body, a discharge pipe connected to the bottom of the closed kiln body, a high-temperature gas conveying component installed through the closed kiln body, and a stirring assembly that rotates based on the high-temperature gas conveying component inside the closed kiln body. High-temperature gas conveying component: includes a main pipe and several high-temperature gas pipes, each of which is provided with an outlet, and the outlets on different high-temperature gas pipes are not on the same plane; The stirring component acts on the low-rank coal accumulated inside the sealed kiln, and the airflow from the main pipe drives the stirring component to rotate.

[0005] The principle and effect of this basic scheme are as follows: 1. Compared with existing technologies, this device has a simple structure and ingenious design. This device does not use a transport-type low-rank coal pyrolysis, but rather a stacked low-rank coal pyrolysis. Although the stacked low-rank coal pyrolysis still has the problem of insufficient absorption of heat from high-temperature gases, this device makes improvements to the high-temperature gas pipes. This device is equipped with multiple high-temperature gas pipes, and the outlet positions of the high-temperature gas pipes are all different, presenting a vertical height difference. Since the stacked low-rank coal has height, the high-temperature gas pipes with vertical height differences are used to achieve the pyrolysis of all the low-rank coal, which can fully absorb the heat from the high-temperature gases. Because it uses a stacked low-rank coal pyrolysis, the adhesion phenomenon caused by the tracked low-rank coal pyrolysis is basically eliminated compared with the tracked low-rank coal pyrolysis.

[0006] 2. Compared with existing technologies, although the adhesion phenomenon caused by the track is basically eliminated, the adhesion of low-rank coal inside the closed kiln body still exists. This is due to the structure of the closed kiln body. To better solve this problem, this device is equipped with a main pipe. The main pipe's function is to allow the inflow of high-temperature gas, similar to the function of a high-temperature gas pipe, but the main pipe has a larger flow rate. This larger gas flow rate is used to drive the stirring device. The stirring device acts on the accumulated low-rank coal inside the closed kiln body, making the position of the low-rank coal dynamic. The dynamic low-rank coal can better undergo pyrolysis with the high-temperature gas in the high-temperature gas pipe. Because the position of the low-rank coal is dynamic, the adhesion phenomenon of low-rank coal inside the closed kiln body can be better eliminated. Thus, this device solves the problem that the low-rank coal cannot fully absorb the heat brought by the high-temperature gas due to the adhesion phenomenon of low-rank coal inside the traditional closed kiln body.

[0007] Furthermore, a conveyor belt for transporting low-rank coal is provided on the outside of the feed pipe, and the output end of the conveyor belt is located inside the feed pipe. The low-rank coal enters the sealed kiln body through the conveyor belt and then accumulates inside the sealed kiln body.

[0008] Furthermore, a gas collection hood is provided on the gas outlet pipe, and a switching valve is provided on the material outlet pipe. After the switching valve is connected to the material outlet pipe, the solids after pyrolysis are recovered through the material outlet pipe.

[0009] Furthermore, a connection port is provided at the bottom of the sealed kiln body, and the discharge pipe is connected to the connection port. The bottom plane of the sealed kiln body near the discharge pipe is an inclined surface, and the inclined direction of the inclined surface is towards the center of the diameter of the connection port. The purpose of the inclined surface design is to cooperate with the discharge pipe so that most of the low-rank coal after pyrolysis can enter the discharge pipe.

[0010] Furthermore, the diameter of the main pipe is larger than that of the high-temperature gas pipe. This allows for a large airflow from the main pipe, which in turn drives the stirring assembly to rotate.

[0011] Furthermore, the high-temperature gas pipe includes an integrally formed upper pipe, a functional pipe, and a lower pipe. The high-temperature gas pipe penetrates the sealed kiln body. The upper pipe is connected to a high-temperature gas generator, and the lower pipe is connected to a gas recovery assembly. The gas outlet is located on the functional pipe. The main pipe is installed on the sealed kiln body, and a guide pipe is provided after the main pipe enters the sealed kiln body. The exhaust gas from the guide pipe acts on the stirring assembly. The exhaust gas from the guide pipe acts on the stirring assembly, causing the stirring assembly to rotate.

[0012] Furthermore, the high-temperature gas pipe is kept parallel to the central axis of the sealed kiln body.

[0013] Furthermore, the stirring assembly includes a connecting rod, a turntable coaxially connected to the connecting rod, a main rod disposed at the center of the turntable, stirring rods symmetrically disposed on the turntable, and an installation assembly for mounting the connecting rod. The installation assembly includes an installation plate disposed at the connection between the sealed kiln body and the gas outlet pipe, an installation groove disposed on the installation plate, and several vent holes opened on the installation plate. The stirring assembly, acting on the accumulated low-rank coal, improves the pyrolysis effect.

[0014] Furthermore, the connecting rod is rotatably connected to the mounting groove, and a rotating bearing is provided at the connection point between the connecting rod and the mounting groove. This allows the connecting rod to rotate, thereby ensuring the stable rotation of the rotating disk.

[0015] Furthermore, the main rod is positioned on the center line of the discharge pipe. Since the main rod can rotate, it can act near the discharge pipe to prevent blockage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This paper shows a schematic diagram of the structure of a low-rank coal pyrolysis device according to an embodiment of this application; Figure 2A front view of a low-rank coal pyrolysis apparatus according to an embodiment of this application is shown; Figure 3 This paper shows a schematic diagram of the structure of a high-temperature gas pipe in a low-rank coal pyrolysis device according to an embodiment of this application; Figure 4 This illustration shows a schematic diagram of the function of the main pipe in a low-rank coal pyrolysis device according to an embodiment of this application; Figure 5 This illustration shows a schematic diagram of the installation of a connecting rod in a low-rank coal pyrolysis device according to an embodiment of this application. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0019] The reference numerals in the accompanying drawings include: 1. Exhaust pipe; 2. Gas collection hood; 3. Main pipe; 4. Upper pipe; 5. Feed pipe; 6. Sealed kiln body; 8. Support rod; 9. Anti-slip pad; 10. Lower pipe; 11. Collection tray; 12. Discharge pipe; 13. Switch valve; 14. Functional pipe; 15. Exhaust hole; 16. Guide pipe; 17. Turntable; 18. Connecting rod; 19. Main rod; 20. Stirring rod; 21. Rotary bearing; 22. Vent hole; 23. Mounting plate.

[0020] Implementation, for example Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown: A low-rank coal pyrolysis device includes a closed kiln body 6, a feed pipe 5 connected to one side of the closed kiln body 6, a gas outlet pipe 1 connected to the top of the closed kiln body 6, a discharge pipe 12 connected to the bottom of the closed kiln body 6, a high-temperature gas conveying component installed through the closed kiln body 6, and a stirring assembly that rotates based on the high-temperature gas conveying component inside the closed kiln body 6. High-temperature gas conveying component: includes a main pipe 3 and several high-temperature gas pipes, each of which is provided with an outlet 15, and the outlets 15 on different high-temperature gas pipes are not on the same plane. The stirring component acts on the low-rank coal accumulated inside the sealed kiln body 6, and the airflow from the main pipe 3 drives the stirring component to rotate.

[0021] Structurally: A conveyor belt for conveying low-rank coal is provided on the outside of the feed pipe 5, and the output end of the conveyor belt is located inside the feed pipe 5. The low-rank coal enters the sealed kiln body 6 through the conveyor belt and then accumulates inside the sealed kiln body 6. The bottom of the sealed kiln body 6 is equipped with several support rods 8, and the free ends of the support rods 8 are equipped with anti-slip pads 9 to ensure the stable placement of the device. A gas collection hood 2 is provided on the gas outlet pipe 1, and a switch valve 13 is provided on the material outlet pipe 12. After the switch valve 13 is connected to the material outlet pipe 12, the solids after pyrolysis are recovered through the material outlet pipe 12. Since pyrolysis requires a certain amount of time, it is necessary to keep the low-rank coal inside the sealed kiln body 6. Therefore, the switch valve 13 needs to be closed, and after pyrolysis is completed, the switch valve 13 is opened again to collect the solids after pyrolysis. The sealed kiln body 6 has a connection port at its bottom, and the discharge pipe 12 is connected to the connection port. The bottom plane of the sealed kiln body 6 near the discharge pipe 12 is an inclined surface, and the inclined direction of the inclined surface is towards the center of the diameter of the connection port. The purpose of the inclined surface design is to cooperate with the discharge pipe 12 so that most of the low-rank coal after pyrolysis can enter the discharge pipe 12.

[0022] like Figure 1 As shown, the diameter of the main pipe 3 is larger than that of the high-temperature gas pipe. A large airflow is obtained from the main pipe 3, which in turn drives the stirring assembly to rotate. Specifically: Regarding the high-temperature gas pipe: The high-temperature gas pipe includes an integrally formed upper pipe, a functional pipe 14 and a lower pipe 10. The high-temperature gas pipe passes through the sealed kiln body 6. The upper pipe is connected to a high-temperature gas generator, and the lower pipe 10 is connected to a gas recovery assembly. The gas outlet 15 is set on the functional pipe 14, and the main pipe 3 is installed on the sealed kiln body 6. The high-temperature gas generator produces high-temperature gas which enters the upper pipe. Part of it enters the sealed kiln 6 through the vent 15 to assist in pyrolysis, and the rest enters the lower pipe 10. The lower pipe 10 is closed, and the high-temperature gas exits through the vent 15. After pyrolysis is completed, the lower pipe 10 is used for exhaust. Because the low-rank coal has a certain height after being piled up, the vents 15 on different high-temperature gas pipes are not on the same plane, so that the low-rank coal at different levels can come into contact with the high-temperature gas. Regarding main pipe 3: After main pipe 3 enters the sealed kiln body 6, it is equipped with a guide pipe 16, such as... Figure 4 As shown, the exhaust airflow from the guide pipe 16 acts on the stirring assembly. The exhaust airflow from the guide pipe 16 acts on the stirring assembly, causing the stirring assembly to rotate.

[0023] The high-temperature gas pipe is kept parallel to the central axis of the sealed kiln body 6 so that the airflow from the air outlet 15 is on a plane at different heights. Regarding the mixing component: The stirring assembly includes a connecting rod 18, a turntable 17 coaxially connected to the connecting rod 18, a main rod 19 set at the center of the turntable 17, stirring rods 20 symmetrically arranged on the turntable 17, and an installation assembly for installing the connecting rod 18. The installation assembly includes an installation plate 23 set at the connection between the sealed kiln body 6 and the gas outlet pipe 1, an installation groove set on the installation plate 23, and several vent holes 22 opened on the installation plate 23. The stirring assembly acts on the low-rank coal after accumulation to improve the pyrolysis effect.

[0024] The main rod 19 is positioned on the center line of the discharge pipe 12. Since the main rod 19 can rotate, it can act near the discharge pipe 12 to prevent the discharge pipe 12 from becoming blocked.

[0025] Specifically, the connecting rod 18 is rotatably connected to the mounting groove, and a rotating bearing 21 is provided at the connection point between the connecting rod 18 and the mounting groove. This enables the connecting rod 18 to rotate, thereby ensuring the stable rotation of the rotating disk.

[0026] Specific implementation process: The first step is for low-rank coal to enter the sealed kiln body 6 and complete the accumulation. In the second step, high-temperature gas is transported from the main pipe 3 and the high-temperature gas pipe. The high-temperature gas pipe acts on the low-rank coal at different heights through the gas outlet 15. At the same time, the main pipe 3 acts on the guide pipe 16, and the guide pipe 16 acts on the stirring assembly. The third step involves the stirring components keeping the accumulated low-rank coal in a dynamic state, which, in conjunction with the high-temperature gas pipe, completes the pyrolysis of the low-rank coal inside the sealed kiln 6. Fourth step: After waiting for a certain period of time, the pyrolysis is completed. Open the switch valve 13, and the solid is discharged and collected from the discharge pipe 12. Then the lower pipe 10 is opened, and the gas is discharged and collected from the lower pipe 10. A collection plate 11 is provided below the lower pipe 10. The collection plate 11 is connected to the lower pipe 10 and has an outlet. When the lower pipe 10 is not opened, it is to enhance the gas output through the vent 15. When the lower pipe 10 is opened, the pyrolysis is completed. The gas output is accelerated in conjunction with the vent pipe 1. A suction machine is provided on the vent pipe 1. The suction machine is used to maintain the gas pressure balance inside the sealed kiln body 6 and prevent loss of control due to excessive pressure. It should be noted that when pyrolysis begins and the lower pipe 10 is not opened, the vent 15 continues to emit gas, and the sealed kiln body 6 is expanding. At this time, a corresponding control system is needed to control the pumping machine to control the gas pressure inside the sealed kiln body 6.

[0027] This device solves the problem that low-rank coal cannot fully absorb the heat from high-temperature gases due to the adhesion phenomenon inside the traditional sealed kiln body 6.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A low-rank coal pyrolysis apparatus, characterized in that: It includes a sealed kiln body, a feed pipe connected to one side of the sealed kiln body, an air outlet pipe connected to the top of the sealed kiln body, a discharge pipe connected to the bottom of the sealed kiln body, a high-temperature gas conveying component installed through the sealed kiln body, and a stirring assembly that rotates based on the high-temperature gas conveying component inside the sealed kiln body. High-temperature gas conveying component: includes a main pipe and several high-temperature gas pipes, each of which is provided with an outlet, and the outlets on different high-temperature gas pipes are not on the same plane; The stirring component acts on the low-rank coal accumulated inside the sealed kiln, and the airflow from the main pipe drives the stirring component to rotate.

2. The low-rank coal pyrolysis apparatus according to claim 1, characterized in that, The feed pipe is equipped with a conveyor belt for conveying low-rank coal, and the output end of the conveyor belt is located inside the feed pipe.

3. The low-rank coal pyrolysis apparatus according to claim 1, characterized in that, The air outlet pipe is equipped with an air collection hood, and the material outlet pipe is equipped with a switch valve.

4. A low-rank coal pyrolysis apparatus according to claim 3, characterized in that, The bottom of the sealed kiln body is provided with a connection port, and the discharge pipe is connected to the connection port. The bottom plane of the sealed kiln body near the discharge pipe is an inclined surface, and the inclined direction of the inclined surface is towards the center of the diameter of the connection port.

5. A low-rank coal pyrolysis apparatus according to claim 1, characterized in that, The diameter of the main pipe is larger than that of the high-temperature gas pipe.

6. A low-rank coal pyrolysis apparatus according to claim 5, characterized in that, The high-temperature gas pipe includes an integrally formed upper pipe, a functional pipe, and a lower pipe. The high-temperature gas pipe penetrates the sealed kiln body. The upper pipe is connected to a high-temperature gas generator, and the lower pipe is connected to a gas recovery assembly. The gas outlet is located on the functional pipe. The main pipe is installed on the sealed kiln body. After the main pipe enters the sealed kiln body, a guide pipe is provided. The exhaust gas from the guide pipe acts on the stirring assembly.

7. A low-rank coal pyrolysis apparatus according to claim 6, characterized in that, The high-temperature gas pipe is kept parallel to the central axis of the sealed kiln body.

8. A low-rank coal pyrolysis apparatus according to claim 6, characterized in that, The stirring assembly includes a connecting rod, a turntable coaxially connected to the connecting rod, a main rod set at the center of the turntable, stirring rods symmetrically arranged on the turntable, and an installation assembly for installing the connecting rod. The installation assembly includes an installation plate set at the connection between the sealed kiln body and the air outlet pipe, an installation groove set on the installation plate, and several ventilation holes opened on the installation plate.

9. A low-rank coal pyrolysis apparatus according to claim 8, characterized in that, The connecting rod is rotatably connected to the mounting groove, and a rotating bearing is provided at the connection point where the connecting rod and the mounting groove are rotatably connected.

10. A low-rank coal pyrolysis apparatus according to claim 8, characterized in that, The main rod is positioned on the center line of the discharge pipe.

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