Adjustable carbonization furnace nitrogen purging gas seal device

Abstract

The utility model relates to carbonization processing technical field, and disclose a kind of adjustable carbonization furnace nitrogen purging gas seal device, including main body and base, main body is divided into two parts, transverse adjustable gap separation, can be realized 0.5-5mm gap continuous regulation by precision lead screw mechanism, four groups of independent nitrogen gas pipeline are respectively arranged on main body, high-purity nitrogen is supplied by external hose, ±30 ° rotating mechanism is built-in in pipeline and is provided with diamond gas outlet hole, rotating partition plate is arranged between pipeline, device is integrated with distributed temperature sensor, laser oxygen analyzer and differential pressure sensor inside, can carry out online remote monitoring to relevant parameter, self-locking pulley and guide rail are provided below device. Through dynamic separation system and multidimensional airflow adjusting mechanism, combined with intelligent monitoring system, the precise control of nitrogen protective gas curtain is realized, the gas seal efficiency can be effectively improved, the nitrogen consumption is reduced, and online dynamic adjustment is supported to adapt to different process requirements.

Description

Technical Field

[0001] This utility model relates to the field of carbonization processing technology, specifically to an adjustable nitrogen purging gas seal device for a carbonization furnace. Background Technology

[0002] In carbon fiber production, the carbonization furnace, as a core piece of equipment, must complete the carbonization reaction of polyacrylonitrile (PAN) precursor fibers in a high-temperature (400-1600℃) and oxygen-free environment. During this process, nitrogen gas sealing devices must be installed at both ends of the carbonization furnace to prevent external oxygen from seeping in and causing fiber oxidation and embrittlement, while also ensuring the effective removal of pyrolysis byproducts from the furnace. However, existing nitrogen gas sealing technology still has the following key drawbacks:

[0003] Uneven nitrogen distribution and lack of directional control

[0004] Existing technologies generally employ uniformly arranged straight-through nitrogen nozzles, which, while achieving basic sealing, have the following drawbacks:

[0005] The airflow direction is unidirectional (usually vertically downward), making it difficult to form an effective laminar air curtain;

[0006] Turbulent eddies can easily form in certain areas, leading to a risk of oxygen infiltration.

[0007] Nitrogen consumption remains high (industry average ≥200m³). 3 / h). Utility Model Content

[0008] The purpose of this invention is to provide an adjustable nitrogen purging gas seal device for a carbonization furnace to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: an adjustable nitrogen purging gas seal device for a carbonization furnace, comprising a main body and a base. The main body is divided into upper and lower parts, separated by an adjustable gap in the horizontal direction. The gap can be continuously adjusted from 0.5 to 5 mm through a precision screw mechanism. Each of the upper and lower parts of the main body is provided with four independent nitrogen pipelines, which are supplied with high-purity nitrogen by external hoses. The pipelines have built-in ±30° rotation mechanisms and are equipped with diamond-shaped gas outlets. Rotating partition plates are configured between the pipelines. The device integrates a distributed temperature sensor, a laser oxygen analyzer, and a differential pressure sensor to remotely monitor relevant parameters online. The device is equipped with self-locking pulleys and guide rails at the bottom, allowing the entire device to slide along the guide rails. The main body is connected to the carbonization furnace body through a flange, and a metal toothed gasket ensures its airtightness.

[0010] Preferably, the lateral adjustable gap is controlled by a precision lead screw mechanism, with an adjustment range of 0.5-5mm and an adjustment accuracy of ±0.1mm, allowing different specifications of wire bundles to pass through according to the production needs of different products.

[0011] Preferably, the precision lead screw mechanism is located inside the main body, while the handwheel for controlling the lifting and lowering of the device is located outside the main body.

[0012] Preferably, the independent nitrogen pipeline and the rotating partition are manually controlled by a knob to rotate in the direction of rotation. The knob for rotating the independent nitrogen pipeline and the rotating partition has a handle direction that indicates the current position of the independent nitrogen pipeline and the rotating partition.

[0013] Preferably, the rotating partition plate has two working states: 0° and 90°. In the 0° state, it connects adjacent air chambers, and in the 90° state, it forms an independent air chamber.

[0014] Preferably, the axial rotation mechanism of the independent nitrogen pipeline provides ±30° angle adjustment, and the outlet holes of the independent nitrogen pipeline are arranged in a diamond pattern with a hole spacing of 3-5 times the hole diameter.

[0015] Preferably, the self-locking pulley is equipped with a pneumatic locking device, and the positioning repeatability of the guide rail is ≤0.5mm.

[0016] Preferably, the distributed temperature sensor is deployed with a four-channel thermocouple array, and the temperature monitoring resolution is 0.1℃.

[0017] Preferably, the oxygen content detection accuracy of the laser oxygen analyzer reaches ±1ppm, and the sampling frequency is ≥10Hz.

[0018] Preferably, the differential pressure sensor has a range of 0-10 kPa and an accuracy of 0.05% FS.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This adjustable nitrogen purging gas seal device for carbonization furnaces, through a dynamic separation system and a multi-dimensional airflow adjustment mechanism combined with an intelligent monitoring system, achieves precise control of the nitrogen protective gas curtain. This effectively improves gas seal efficiency, reduces nitrogen consumption, and supports online dynamic adjustment to adapt to different process requirements. The device adopts a modular structure and is equipped with a mobile base with a self-locking function, significantly improving equipment maintenance convenience while ensuring sealing performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the nitrogen pipeline structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the independent working state of the air chamber of this utility model;

[0024] Figure 4 This is a schematic diagram of the working state of the air chamber connection of this utility model.

[0025] In the diagram: 1. Main body; 2. Base; 3. Precision lead screw mechanism; 4. Independent nitrogen pipeline; 5. External hose; 6. Rotating partition plate; 7. Distributed temperature sensor; 8. Laser oxygen analyzer; 9. Differential pressure sensor; 10. Laterally adjustable gap; 11. Self-locking pulley; 12. Guide rail. Detailed Implementation

[0026] 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.

[0027] Please see Figure 1-4 The present invention provides the following technical solution:

[0028] An adjustable nitrogen purging gas seal device for a carbonization furnace includes a main body 1 and a base 2. The main body 1 is divided into upper and lower parts, separated by a horizontally adjustable gap 10. The gap is continuously adjustable from 0.5 to 5 mm via a precision screw mechanism 3. The horizontally adjustable gap 10 is controlled by the precision screw mechanism 3, with an adjustment range of 0.5-5 mm and an adjustment accuracy of ±0.1 mm. It allows different specifications of wire bundles to pass through according to the production needs of different products. The precision screw mechanism 3 is located inside the main body 1, while the handwheel controlling the lifting and lowering of the device is located outside the main body 1. The main body 1 has four sets of independent nitrogen pipelines 4 on each side, supplied with high-purity nitrogen by external hoses 5. The independent nitrogen pipelines 4 and the rotating partition plate 6 are connected by a knob, and the rotation direction is manually controlled by a knob. The knob for the rotation angle of the independent nitrogen pipelines 4 and the rotating partition plate 6 indicates the current position of the independent nitrogen pipelines 4 and the rotating partition plate 6. The rotating partition plate 6 has two working states: 0° fully flat and 90° fully upright. In the 0° state, it connects to the adjacent gas chamber, and in the 90° state... An independent gas chamber is formed. The axial rotation mechanism of the independent nitrogen pipeline 4 provides ±30° angle adjustment. The outlet holes of the independent nitrogen pipeline 4 are arranged in a diamond pattern with a spacing of 3-5 times the hole diameter. The pipeline has a built-in ±30° rotation mechanism and diamond-shaped outlet holes. Rotary partition plates 6 are configured between pipelines. The device integrates a distributed temperature sensor 7, a laser oxygen analyzer 8, and a differential pressure sensor 9. The distributed temperature sensor 7 deploys a four-channel thermocouple array with a temperature monitoring resolution of 0.1℃. The laser oxygen analyzer 8 has an oxygen content detection accuracy of ±1ppm and a sampling frequency of ≥10Hz. The differential pressure sensor 9 has a range of 0-10kPa and an accuracy of 0.05%FS. It performs online remote monitoring of relevant parameters. The device has a self-locking pulley 11 and a guide rail 12 at the bottom. The self-locking pulley 11 is equipped with a pneumatic locking device. The positioning repeatability of the guide rail 12 is ≤0.5mm, allowing the entire device to slide along the guide rail 12. The main body 1 is connected to the carbonization furnace body through a flange, and a metal toothed gasket ensures its airtightness.

[0029] 1. Modular main structure implementation

[0030] Assembly steps:

[0031] The main body 1 consists of two parts, upper and lower, with a welded frame made of 304L stainless steel and a wall thickness of 8mm. The interior is lined with a 5mm thick silicon nitride ceramic insulation layer.

[0032] The upper and lower parts of the main body 1 are separated by a horizontally adjustable gap 10 and connected by a precision lead screw mechanism 3 with a lead screw pitch of 4mm.

[0033] Parameter settings:

[0034] Fiber bundle specifications and gap correspondence table

[0035] filament type 3K 6K 12K 24K Gap (mm) 0.8 1.2 1.8 2.5

[0036] 2. Implementation of a multi-channel nitrogen distribution system

[0037] Piping assembly:

[0038] Independent nitrogen pipeline 4 uses 316 stainless steel pipe with an inner diameter of Φ25mm, a wall thickness of 2mm, and a mirror-polished surface with Ra≤0.2μm.

[0039] Vent hole machining requirements:

[0040] The major axis of the diamond-shaped hole is 3mm, and the minor axis is 1.5mm.

[0041] Axial spacing 15mm, circumferential stagger angle 30°

[0042] Rotating partition plate 6 implementation:

[0043] The plate is 3mm thick, and the rotating shaft is equipped with a harmonic reducer with a reduction ratio of 1:100.

[0044] 90° verticality error < 1°

[0045] Airflow control:

[0046] Pipeline flow rate setting: 0-40 Nm3 / h

[0047] Rotation angle calibration: Positioning grooves are set every 15°, equipped with spring plunger positioning. 3. Implementation of the moving positioning system.

[0048] Guide rail 12 assembly:

[0049] The linear guide 12 is 2000mm long and has a load capacity of 3500N.

[0050] Implementation details of self-locking pulleys:

[0051] Φ150mm polyurethane coated wheel

[0052] The working pressure of the pneumatic locking cylinder is 0.6-0.8 MPa.

[0053] 4. Implementation of Intelligent Monitoring System

[0054] Temperature monitoring:

[0055] Four K-type armored thermocouples are arranged at 200mm intervals along the wire bundle direction, with a temperature measurement range of 0-500℃ and a resolution of 0.1℃.

[0056] Pressure monitoring:

[0057] Differential pressure sensor 9, measuring range 0-10 Pa, accuracy 0.05% FS

[0058] Gas Analysis:

[0059] Laser Oxygen Analyzer 8: TDLAS technology, detection limit 0.1 ppm

[0060] Sampling frequency: 1Hz in normal mode, 10Hz in alarm mode

[0061] 5. Implementation Cases

[0062] Case 1: 12K Tow Production

[0063] Initial settings:

[0064] Adjust the gap to 1.8mm

[0065] Divider angle setting: all four groups are 90°

[0066] Independent nitrogen pipeline 4 rotation angles: two inner groups 0°, two outer groups 15°

[0067] Operating parameters:

[0068] Total nitrogen flow rate: 120m³ 3 / h

[0069] Pressure difference in air chamber: 2.5 Pa

[0070] Actual test results:

[0071] Oxygen permeability: 2.2 ppm

[0072] Fiber tension fluctuation: <50cN.

[0073] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable nitrogen purging gas seal device for a carbonization furnace, comprising a main body (1) and a base (2), characterized in that: The main body (1) is divided into upper and lower parts, separated by a horizontally adjustable gap (10). The gap can be continuously adjusted from 0.5 to 5 mm through a precision screw mechanism (3). The main body (1) is equipped with four independent nitrogen pipelines (4) on each side, and high-purity nitrogen is supplied by an external hose (5). The pipeline has a built-in ±30° rotation mechanism and a diamond-shaped air outlet. A rotating partition plate (6) is configured between the pipelines. The device integrates a distributed temperature sensor (7), a laser oxygen analyzer (8), and a differential pressure sensor (9) to monitor relevant parameters remotely online. The device has a self-locking pulley (11) and a guide rail (12) at the bottom, so that the whole device slides along the guide rail (12). The main body (1) is connected to the carbonization furnace body through a flange, and a metal toothed gasket ensures its airtightness.

2. The adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 1, characterized in that: The adjustable lateral gap (10) is controlled by a precision lead screw mechanism (3), with an adjustment range of 0.5-5mm and an adjustment accuracy of ±0.1mm. It allows different specifications of wire bundles to pass through according to the production needs of different products.

3. The adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 2, characterized in that: The precision lead screw mechanism (3) is located inside the main body (1), and the handwheel for controlling the lifting and lowering of the device is located outside the main body (1).

4. The adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 3, characterized in that: The independent nitrogen pipeline (4) and the rotating partition plate (6) are manually controlled by a knob to rotate in the direction of rotation. The knob for rotating the independent nitrogen pipeline (4) and the rotating partition plate (6) indicates the current position of the independent nitrogen pipeline (4) and the rotating partition plate (6).

5. An adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 4, characterized in that: The rotating partition plate (6) has two working states: 0° and 90°. In the 0° state, it connects adjacent air chambers, and in the 90° state, it forms an independent air chamber.

6. The adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 5, characterized in that: The axial rotation mechanism of the independent nitrogen pipeline (4) provides ±30° angle adjustment. The outlet holes of the independent nitrogen pipeline (4) are arranged in a diamond pattern with a hole spacing of 3-5 times the hole diameter.

7. An adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 6, characterized in that: The self-locking pulley (11) is equipped with a pneumatic locking device, and the positioning repeatability of the guide rail (12) is ≤0.5mm.

8. An adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 7, characterized in that: The distributed temperature sensor (7) is deployed with a four-channel thermocouple array, and the temperature monitoring resolution is 0.1℃.

9. An adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 8, characterized in that: The laser oxygen analyzer (8) has an oxygen content detection accuracy of ±1ppm and a sampling frequency of ≥10Hz.

10. An adjustable nitrogen purging gas seal device for a carbonization furnace according to claim 9, characterized in that: The differential pressure sensor (9) has a range of 0-10 kPa and an accuracy of 0.05%FS.

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