Photocuring ceramic degreasing box-type furnace based on tail gas analysis and real-time adjustment and tail gas analysis and real-time adjustment method

Abstract

The invention relates to the technical field of ceramic green body thermal decomposition degreasing and residual carbon removal, in particular to a tail gas analysis-based real-time adjustment photocuring ceramic degreasing box-type furnace which comprises a box-type furnace body provided with a hearth, a heating assembly, a temperature measurement assembly, an inert gas introduction assembly, an in-furnace pressure monitoring assembly and an exhaust and tail gas filtering assembly, the device comprises a degreasing residue collecting assembly, a heating power adjusting assembly, a tail gas online analysis assembly and a control and data processing assembly. According to the invention, the temperature field is measurable, the flow field is stable, the pressure is controllable, the pollution can be collected, the emission can be purified, the outgassing can be sensed, the process can be decided by itself, and the data can be traced in the degreasing process, so that the degreasing quality, the process repeatability, the equipment maintainability and the environmental friendliness are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic green body thermal decomposition debinding and residual carbon removal, and particularly relates to a light-cured ceramic debinding box-type furnace based on real-time adjustment of tail gas analysis and a tail gas analysis real-time adjustment method. BACKGROUND

[0002] Light-cured additive manufacturing such as SLA and DLP is increasingly widely used in the preparation of ceramic complex components. The green body is obtained by layer-by-layer solidification of ceramic slurry containing an organic resin system. Before entering high-temperature sintering, the green body usually needs to be debound at low temperature to remove the resin binder and its cracking products, form stable pore channels and reduce the risk of subsequent sintering cracking.

[0003] Compared with traditional pressing, slurry casting or injection molding, the light-cured ceramic green body has relatively higher organic phase content, relatively concentrated cracking temperature zone and fast volatile release rate. A large amount of flammable, irritating volatile components and condensable tar-like by-products are easily produced during the debinding process, which are often manifested as black oil or viscous condensate, accompanied by smoke and odor. Once the furnace temperature field is uneven or the temperature measurement is inaccurate, the debinding rate inside and outside the green body is prone to mismatch, leading to internal gas pressure accumulation and local heat accumulation, thereby causing defects such as cracking, delamination, bubbling and warping; at the same time, the tar-like products may be re-volatilized and re-deposited after deposition in the furnace, causing workpiece contamination, surface defects and equipment cleaning difficulties.

[0004] The existing box-type debinding furnace still has the following deficiencies in engineering application: first, single-point or a small number of temperature measurement methods are often used, which cannot accurately reflect the temperature difference in the upper and lower and circumferential directions of the furnace, and the control temperature and the actual temperature of the workpiece are prone to deviation; second, when the power distribution of the heating zone and the design of the furnace structure are unreasonable, the uniformity of the temperature field is insufficient, leading to local overheating or underheating; third, the inert gas introduction structure is mainly single inlet direct gas injection, which is prone to form high-speed jet flow, causing powder or cracking products to be blown and spread in the furnace, affecting the stability of debinding; fourth, most of the equipment lack online monitoring of the pressure in the furnace and fine exhaust adjustment means, which makes it difficult to maintain a stable micro-positive pressure / micro-negative pressure environment during the debinding stage, affecting the volatile discharge efficiency and process repeatability; fifth, for the black oily condensate commonly existing in light-cured debinding, the traditional furnace usually lacks special collection and flow guide structure, causing the deposition of residual materials in the furnace bottom, tooling or heating zone, which aggravates the pollution and increases the maintenance cost.

[0005] In addition, the tail gas discharged during debinding often contains volatile organic components and odor components. The existing equipment is directly discharged or only discharged through a simple pipeline, and lacks an adsorption purification device for the tail gas, which easily causes odor and pollution problems in the experimental environment, and is not conducive to emission control and safety of the environment around the equipment.

[0006] Furthermore, during the low-temperature degreasing process of photocurable green bodies, the cracking gas release intensity typically exhibits significant time-varying fluctuations due to factors such as furnace loading, structural wall thickness, rib intersection zones, thickness transition zones, and differences in organic system formulations. Existing degreasing furnaces mostly employ preset fixed temperature curves and fixed exhaust strategies, lacking the ability to online sense and dynamically adjust the "gas release intensity" during degreasing, making it difficult to promptly identify sudden increases in risk during the main gas release phase. When the gas release rate exceeds the discharge capacity, internal pressure fluctuations and peak pressures easily occur, potentially inducing cracking, bubbling, or stratification. On the other hand, the lack of online monitoring of exhaust gas composition and concentration also makes exhaust purification and filter replacement reliant on experience-based judgment, easily leading to problems such as filter saturation failure, exhaust gas leakage pollution, or abnormal exhaust resistance. Simultaneously, the lack of digital recording and traceable analysis of degreasing data makes it difficult to provide a reliable basis for subsequent process optimization.

[0007] Therefore, there is an urgent need for a box-type degreasing furnace designed for low-temperature degreasing of photocurable ceramic green bodies. This furnace should improve the accuracy and uniformity of temperature field measurement, achieve steady-state control of the inert gas flow field and visualized adjustment of the furnace pressure, and have the ability to collect degreasing black oil residue and filter and purify exhaust gas. Furthermore, it should incorporate online exhaust gas analysis and computer / control system linkage to achieve adaptive temperature program and exhaust strategy adjustment based on exhaust gas release intensity, thereby improving degreasing quality, process repeatability, equipment maintainability, and environmental friendliness. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a photocurable ceramic degreasing box furnace based on real-time adjustment of exhaust gas analysis. This furnace enables measurable temperature field, stable flow field, controllable pressure, collectable pollution, purified emissions, detectable gas release, self-decision-making process, and traceable data during the degreasing process, thereby improving degreasing quality, process repeatability, equipment maintainability, and environmental friendliness.

[0009] The present invention adopts the following technical solution:

[0010] A box-type furnace for degreasing photocurable ceramics based on real-time adjustment of exhaust gas analysis includes a box-type furnace body with a furnace chamber, and further includes...

[0011] Heating components are used to heat the furnace chamber;

[0012] Temperature measuring components are used to measure the temperature of the furnace.

[0013] Inert gas introduction assembly, used to introduce inert gas into the furnace;

[0014] The furnace pressure monitoring component is used to continuously monitor the pressure inside the furnace.

[0015] Exhaust and tail gas filtration assembly is used to maintain furnace pressure during furnace exhaust and to filter the exhaust gas.

[0016] The degreasing residue collection assembly is a detachable oil condensation tank or a pull-out oil collection tray, which is set at the lowest point of the furnace bottom and has a guide slope and / or guide groove to collect tar / black oil-like condensed residue for the purpose of collecting degreasing residue.

[0017] Heating power adjustment component, used to adjust the heating of the heating component;

[0018] An online exhaust gas analysis component is installed in the exhaust channel of the exhaust gas and exhaust gas filtration component to obtain information on the composition and / or concentration of degreased exhaust gas.

[0019] The control and data processing component is connected to the temperature measurement component, the furnace pressure monitoring component, and the exhaust gas online analysis component. It is used to calculate the release intensity index G based on the exhaust gas online analysis data and output control commands to adjust the heating power adjustment component and / or the inert gas introduction component and / or the exhaust component in a coordinated manner, so as to realize adaptive control of the degreasing process.

[0020] The exhaust and tail gas filtration assembly includes a controllable exhaust valve, a furnace pressure monitoring component and a control and data processing component connected by signal, and the control and data processing component adjusts the opening of the exhaust valve according to the furnace pressure feedback to maintain the target furnace pressure range; it also includes a replaceable activated carbon filter for adsorbing volatile organic compounds and / or odor components in the tail gas; a pre-filtration or interception structure is provided upstream of the activated carbon filter, which is any one or a combination of metal wire mesh, heat-resistant filter cotton or condensation interception chamber, for intercepting dust and / or oil mist to reduce activated carbon clogging;

[0021] The control and data processing component is connected to the host computer and records temperature, pressure, exhaust gas detection data, threshold trigger points and execution actions. After degreasing is completed, a process report is output to achieve process traceability.

[0022] Preferably, the temperature measuring component has at least five temperature measuring points inside the furnace, namely a temperature measuring point directly above the furnace, a temperature measuring point on the middle rear wall, a temperature measuring point on the middle left side wall, a temperature measuring point on the middle right side wall, and a temperature measuring point directly below the furnace, for obtaining the temperature distribution in the vertical and circumferential directions of the furnace.

[0023] Preferably, the heating component is a symmetrical partitioned heating structure, with at least three heating zones on the left and at least three heating zones on the right, and the power can be adjusted independently or in groups through a heating power adjustment component.

[0024] Preferably, the control and data processing component uses the average temperature of the central temperature measuring point as the main control temperature, and sets constraints on the upper / lower temperature difference and the circumferential temperature difference. When the temperature difference exceeds the threshold, the power of the left and right heating zones is compensated and adjusted.

[0025] Preferably, a flow-blocking structure is provided inside the inlet of the inert gas inlet assembly. The flow-blocking structure is any one or a combination of a baffle plate, a perforated diffuser plate, or a labyrinth buffer structure, used to reduce the inlet jet velocity and promote uniform gas distribution.

[0026] Preferably, the exhaust gas online analysis component includes at least two of the following: a VOC / total hydrocarbon detection unit, a CO / CO2 detection unit, and an O2 detection unit; the exhaust gas online analysis component is connected to the exhaust channel via a sampling probe and a sampling pipeline, and the sampling pipeline is equipped with a heating structure and / or a filtration structure to reduce the impact of tar condensation and blockage on the detection stability.

[0027] Preferably, the gas release intensity index G is obtained by combining at least two of the change rates of any one of the following indices: VOC / total hydrocarbon concentration, CO concentration, CO2 concentration, and O2 concentration, wherein the combination is a linear combination or a nonlinear combination.

[0028] Preferably, the gas release intensity index G is obtained by combining at least two of the following: VOC / total hydrocarbon concentration, CO concentration, CO2 concentration, O2 concentration, and the rate of change of any of the above indices, wherein the combination is a linear combination or a nonlinear combination.

[0029] The method for real-time tail gas analysis and adjustment of a photocurable ceramic degreasing box furnace based on tail gas analysis includes:

[0030] S1: Load the light-cured ceramic green body into the furnace chamber, start the inert gas introduction component, and establish a controllable atmosphere and exhaust channel through the exhaust component;

[0031] S2: Start the heating component to heat up according to the preset temperature program, the temperature measuring component collects the temperature at multiple points in the furnace, and the furnace pressure monitoring component collects the furnace pressure.

[0032] S3: The exhaust gas online analysis component performs online detection of exhaust gas in the exhaust channel, and the control and data processing component calculates the release intensity index G based on the exhaust gas detection data;

[0033] S4: When G exceeds the threshold and / or the rate of change of G increases abnormally and / or the pressure inside the furnace exceeds the set range, the control and data processing components automatically execute one or more linkage control strategies: reduce the heating rate and / or enter the heat preservation section, adjust the inert gas flow rate, adjust the exhaust capacity, and perform zone compensation for heating power so that the gas release rate matches the exhaust capacity.

[0034] S5: Once G drops and stabilizes, the control and data processing components will automatically resume heating or enter the next degreasing stage;

[0035] S6: After degreasing is completed, cool the system and output the degreasing process data record;

[0036] When the exhaust gas O2 rises abnormally and / or the furnace pressure exceeds the upper limit threshold, the control and data processing components trigger an alarm and execute a protection process of slowing down the heating rate, increasing the inert gas flow rate, increasing the exhaust valve opening, and / or cooling down and shutting down.

[0037] Preferably, the linkage control strategy includes:

[0038] a. Reduce the heating rate and / or enter the heat preservation section;

[0039] b. Increase the opening of the exhaust valve to improve the discharge capacity;

[0040] c. Increase the inert gas flow rate to enhance the carry-out capacity and suppress backflow;

[0041] d. Adjust the heating power of the left and right zones to reduce the temperature difference.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] 1. The process can make its own decisions and reduce the risk of defects: the online exhaust gas analysis provides a real-time characterization of the release intensity, and the closed-loop adaptive adjustment of heating / heating, gas flow and exhaust valve opening can reduce the internal pressure peak in the main release stage in a timely manner and reduce the probability of defects such as bulging, delamination and cracks.

[0044] 2. Accurate temperature measurement and uniform temperature control: Five-point temperature measurement covers temperature information from top to middle to bottom circumferential direction. Combined with left and right zone heating and power compensation adjustment, it can significantly improve the uniformity of furnace temperature and the accuracy of temperature control.

[0045] 3. More stable flow field and less pollution: The inert gas inlet baffle / diffusion structure effectively suppresses high-speed jets, reduces powder blowing and diffusion deposition of pyrolysis products, and improves furnace cleanliness and workpiece surface quality.

[0046] 4. Visualized pressure and controllable exhaust: Furnace pressure monitoring and controllable exhaust at the rear make the furnace pressure stable and controllable, improve the efficiency of volatile matter discharge and enhance process repeatability and safety.

[0047] 5. Residue can be collected and maintenance is more convenient: The bottom oil collection tray collects black oily condensate in a directional manner and can be pulled out for cleaning, which significantly reduces furnace pollution and maintenance costs;

[0048] 6. Purified exhaust gas, more environmentally friendly: Activated carbon filter components adsorb and purify VOCs and odors, reducing emissions pollution and environmental impact;

[0049] 7. Data traceability and easy process iteration: Process parameters are automatically recorded and reported, providing data support for degreasing optimization under different material systems, structural complexities and furnace loading conditions. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of a photocurable ceramic degreasing box furnace based on real-time adjustment of exhaust gas analysis.

[0051] Figure 2 This is a schematic diagram of the workflow of a photocurable ceramic degreasing box furnace based on real-time adjustment of exhaust gas analysis.

[0052] In the picture:

[0053] Box-type furnace body 1; furnace chamber 2; heating component 3; temperature measuring component 4; inert gas introduction component 5; furnace internal pressure monitoring component 6; exhaust and tail gas filtration component 7; degreasing residue collection component 8; heating power adjustment component 9; tail gas online analysis component 10; control and data processing component 11. Detailed Implementation

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0055] like Figure 1 As shown, a detailed description is provided for a degreasing box furnace for photocurable ceramics based on real-time adjustment through exhaust gas analysis:

[0056] A box-type furnace for degreasing photocurable ceramics based on real-time adjustment of exhaust gas analysis includes: a box-type furnace body 1, a furnace chamber 2, a heating component 3, a temperature measuring component 4, an inert gas introduction component 5, a furnace internal pressure monitoring component 6, an exhaust and exhaust gas filtration component 7, a degreasing residue collection component 8, and a heating power adjustment component 9; and further includes an online exhaust gas analysis component 10, a control and data processing component 11, and an actuator interface to form a closed-loop adaptive control system based on the exhaust gas release intensity. Details are as follows:

[0057] (1) Five-point temperature field monitoring structure

[0058] Five temperature measuring points are set inside the furnace chamber 2: the first temperature measuring point T1 is set at the top of the furnace chamber 2; the second temperature measuring point T2, the third temperature measuring point T3, and the fourth temperature measuring point T4 are set on the rear wall, left wall, and right wall of the middle part of the furnace chamber 2, respectively; and the fifth temperature measuring point T5 is set at the bottom of the furnace chamber 2, so as to obtain the temperature distribution information in the vertical and circumferential directions of the furnace chamber 2, improve the accuracy of temperature field characterization, and provide a basis for temperature uniformity correction.

[0059] (2) Symmetrical left and right zone heating structure and power regulation

[0060] Heating component 3 adopts a resistance wire heating structure. Three heating zones are set on the left side and three heating zones are set on the right side of the furnace chamber 2 to form a symmetrical left and right zone heating. Heating power adjustment component 9 supports independent or group power adjustment of each heating zone, and can compensate for the left and right power distribution based on the five-point temperature measurement results to improve the temperature uniformity of the furnace chamber 2 and reduce the risk of defects caused by local overheating / underheating.

[0061] (3) Inert gas inlet flow blocking / diffusion stabilization structure

[0062] The inert gas inlet component 5 is located at the rear center or side rear of the furnace body, and a baffle structure is provided inside the inert gas inlet. The baffle structure can be one or a combination of a baffle plate, a diffuser plate, or a labyrinth-type baffle, so that the inert gas is decelerated and diffused before entering the furnace chamber 2, suppressing the high-speed jet from scouring the workpiece, avoiding the blowing and diffusion of powder or pyrolysis products, and reducing secondary deposition.

[0063] (4) Furnace pressure monitoring and rear upper controllable exhaust structure

[0064] A furnace pressure monitoring device is installed above the furnace body to monitor the furnace chamber pressure in real time; an exhaust channel and a controllable exhaust valve are installed at the rear top of the furnace body to make the micro-positive / micro-negative pressure state inside the furnace visible and adjustable, thereby improving the efficiency of pyrolysis volatiles discharge and the stability of the degreasing process.

[0065] (5) Exhaust gas filtration and purification structure

[0066] An exhaust gas filter assembly is installed downstream of the exhaust channel, preferably a replaceable activated carbon filter, and a pre-interception structure can be installed to intercept dust / oil mist, so as to adsorb and purify volatile organic compounds and odor components in the degreased exhaust gas, thereby reducing environmental pollution and emission risks.

[0067] (6) Directional collection structure for defatted black oil / tar condensate residue

[0068] A removable oil collection condensation tank or a pull-out oil collection tray is installed at the bottom of the furnace chamber 2. The oil collection structure can be equipped with a guide slope or guide groove to direct the black oily condensation residue produced by degreasing to collect in a directional manner and facilitate cleaning and maintenance, avoiding disorderly deposition of residue that causes pollution inside the furnace and secondary volatilization and re-deposition.

[0069] (7) The exhaust gas online analysis component 10 is linked with the computer / control system.

[0070] An online exhaust gas analysis component 10 is installed in the exhaust channel to detect at least two types of indicators in the exhaust gas: any two or more of VOC / total hydrocarbons, CO / CO2, and O2. The control and data processing component 11 is connected to the temperature measurement component 4, the furnace pressure monitoring component 6, and the online exhaust gas analysis component 10, and is also connected to the heating power adjustment component 9, the inert gas flow regulating valve, and the exhaust valve opening actuator to form a closed-loop control system.

[0071] (8) Adaptive closed-loop control method based on gas release intensity

[0072] The control and data processing component 11 calculates the release intensity index G based on online exhaust gas analysis data, and makes a judgment based on the temperature distribution and pressure status inside the furnace: when G exceeds the threshold or the rate of change increases abnormally, it automatically reduces the heating rate and / or enters the heat preservation platform, and adjusts the inert gas flow rate and exhaust valve opening in conjunction to match the release rate with the discharge capacity; when G falls back and stabilizes, it automatically resumes heating or enters the next stage. At the same time, the system can record and output temperature, pressure, exhaust gas concentration, and actuator actions, realizing the digitalization and traceability of the degreasing process.

[0073] like Figure 2 As shown, a detailed explanation is provided of a method for real-time tail gas analysis and adjustment of a photocurable ceramic degreasing box furnace based on tail gas analysis:

[0074] A method for real-time tail gas analysis and adjustment of a photocurable ceramic degreasing box furnace based on tail gas analysis includes the following steps:

[0075] Step 1: Loading and Preparing the Furnace

[0076] Place the light-cured ceramic green body to be degreased (which can be a green body printed by SLA / DLP) into the bearing area inside furnace chamber 2, close the furnace door, and confirm that it is sealed. Check that the degreasing residue collection assembly 8 is in the correct installation position and pull out the tray / oil collection tank to ensure that the tar / black oil condensate generated during the degreasing process can collect at the bottom of the furnace.

[0077] Step 2: Inert gas replacement and basic exhaust system establishment

[0078] The inert gas inlet assembly 5 is activated to introduce inert gas, such as N2 or Ar, into the furnace, and a stable exhaust channel is established through the exhaust and tail gas filter assembly 7. During this stage, the furnace pressure monitoring assembly 6 monitors the furnace pressure in real time and, in conjunction with the exhaust valve of the exhaust and tail gas filter assembly 7, maintains the furnace within a preset, controllable slightly positive pressure range, preventing backflow of outside air and ensuring a stable degreasing atmosphere. The inlet of the inert gas inlet assembly 5 is equipped with a baffle structure, which slows down and diffuses the inert gas as it enters the furnace, reducing the blowing of powder and pyrolysis products within the furnace.

[0079] Step 3: Temperature program startup and five-point temperature monitoring

[0080] Heating component 3 is activated, and heating drive is output from heating power adjustment component 9 to heat up according to the preset degreasing and heating program. Temperature measurement component 4 provides multi-point temperature information within the furnace chamber, namely, five points: top / middle rear / middle left / middle right / bottom, used to monitor the temperature difference between the upper and lower parts of the furnace chamber and the circumferential temperature difference. The control strategy can be as follows: the average temperature of the middle temperature measurement point is used as the main control temperature, and constraints are set on the upper and lower temperature differences and the left and right temperature differences; when the temperature difference exceeds the threshold, the heating power is adjusted to compensate, that is, the heating power of each zone is automatically fine-tuned to ensure the uniformity of the temperature field in the furnace, thereby improving the temperature field uniformity and reducing the risk of cracks, delamination, and blistering caused by uneven local heating.

[0081] Step 4: Online analysis of exhaust gas and determination of release intensity

[0082] Volatile substances generated during degreasing are discharged through the exhaust channel of the exhaust and tail gas filter assembly 7 and then piped to the tail gas analysis assembly 10 for online detection. The tail gas analysis assembly 10 can detect at least several indicators in the tail gas, such as VOC / total hydrocarbons, CO / CO2, and O2, to characterize the degreasing cracking gas release behavior in real time. The control and data processing assembly 11 is connected to the temperature measurement signal of the temperature measurement assembly 4, the pressure signal of the furnace pressure monitoring assembly 6, and the tail gas signal of the tail gas analysis assembly 10. It processes the tail gas data and calculates the release intensity index G to identify the sudden increase risk during the main release phase.

[0083] Step 5: Closed-loop adaptive control based on exhaust gas

[0084] When the control and data processing component 11 determines that the gas release intensity index G exceeds the threshold or rises too quickly, or when the furnace pressure monitoring component 6 detects that the furnace pressure fluctuation has reached the upper limit, the control and data processing component 11 sends a control command to the heating power adjustment component 9 and related execution units to automatically execute one or more of the following linkage strategies to match the "gas release rate" with the "discharge capacity":

[0085] 1. Heating / Insulation Adaptive

[0086] The furnace body automatically reduces the heating rate or enters the insulation platform to reduce the amount of gas released per unit time, thus avoiding cracking or bubbling caused by internal gas pressure peaks.

[0087] 2. Exhaust capacity self-adaptation, i.e., exhaust valve adjustment

[0088] The furnace body automatically adjusts the exhaust valve opening or exhaust capacity of the exhaust and tail gas filtration component 7 to improve the efficiency of pyrolysis product discharge; at the same time, it combines the pressure feedback of the furnace pressure monitoring component 6 to maintain the target furnace pressure range and prevent pressure from exceeding the limit.

[0089] 3. Adaptive inert gas flow rate

[0090] The furnace body automatically adjusts the inert gas flow rate of the inert gas inlet component 5 according to the exhaust gas concentration and furnace pressure, thereby enhancing the carrying and discharge capacity of degreasing and decomposition gases.

[0091] 4. Temperature field uniformity compensation

[0092] The furnace body automatically compensates or fine-tunes the heating power output of the heating power adjustment component 9 based on the multi-point temperature difference results of the temperature measuring component 4, such as the power distribution on the left and right sides or the upper, middle and lower sides, to reduce the structural stress concentration and defect sensitivity caused by temperature difference.

[0093] When the control and data processing component 11 determines that G has fallen back and remained in the stable region for a period of time, the system automatically resumes the original heating strategy or enters the next temperature stage, realizing an automated degreasing process that "advances by self-decision-making based on gas release behavior".

[0094] Step Six: Exhaust Gas Purification and Emission and Black Oil Residue Collection

[0095] During the degreasing process, the exhaust gas first enters the exhaust and tail gas filter assembly 7. The filter assembly is equipped with an activated carbon filter unit to adsorb odors and volatile organic components, reducing pollution emissions. The tar / black oily condensate residue generated during the degreasing process condenses in the cooler area of ​​the furnace and collects at the bottom of the furnace. It is then collected by the degreasing residue collection assembly 8 to prevent contamination of the furnace wall, tooling, and heating zone, and to reduce secondary volatilization and deposition in subsequent stages.

[0096] Step 7: Degreasing complete, cooling and maintenance

[0097] After degreasing is complete, stop heating and cool to a safe temperature under an inert atmosphere according to the procedure before opening the furnace and removing the parts. Remove the oil collection tray / tank from the degreasing residue collection component 8 and clean out any black oil residue. Based on the exhaust gas concentration trend and operating time monitored by the exhaust gas analysis component 10, replace and maintain the activated carbon filter material of the exhaust and exhaust gas filter component 7. The control and data processing component 11 can store and export data from the entire process, such as temperature, pressure, exhaust gas concentration, valve and power operation records, forming a traceable degreasing process archive for subsequent process optimization and quality reproduction.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A box furnace for degreasing photocurable ceramics based on real-time adjustment of exhaust gas analysis, comprising a box furnace body (1) with a furnace chamber (2), characterized in that: Also includes Heating assembly (3) is used to heat the furnace chamber (2); Temperature measuring component (4) is used to measure the temperature of the furnace (2); Inert gas introduction component (5) is used to introduce inert gas into the furnace (2); The furnace pressure monitoring component (6) is used to continuously monitor the pressure inside the furnace (2); Exhaust and tail gas filtration assembly (7) is used to maintain furnace pressure during exhaust in the furnace (2) and to filter the exhaust gas. The degreasing residue collection assembly (8) is located at the lowest point of the bottom of the furnace (2) and is used to collect the degreasing residue; Heating power adjustment component (9) is used to adjust the heating of heating component (3); An online exhaust gas analysis component (10) is installed on the exhaust channel of the exhaust gas and exhaust gas filter component (7) to obtain information on the composition and / or concentration of the degreased exhaust gas; The control and data processing component (11) is connected to the temperature measurement component (4), the furnace pressure monitoring component (6), and the exhaust gas online analysis component (10) to calculate the gas release intensity index G based on the exhaust gas online analysis data, and output control commands to adjust the heating power adjustment component (9) and / or the inert gas introduction component (5) and / or the exhaust component (7) in a coordinated manner to achieve adaptive control of the degreasing process.

2. The degreasing box furnace for photocurable ceramics according to claim 1, characterized in that: The temperature measuring component (4) has at least five temperature measuring points inside the furnace (2), namely the temperature measuring point directly above the furnace, the temperature measuring point on the middle rear wall, the temperature measuring point on the middle left side wall, the temperature measuring point on the middle right side wall, and the temperature measuring point directly below the furnace, which are used to obtain the temperature distribution in the vertical and circumferential directions of the furnace.

3. The degreasing box furnace for photocurable ceramics according to claim 2, characterized in that: The heating component (3) is a symmetrical partitioned heating structure with at least three heating zones on the left and at least three heating zones on the right, and can be adjusted independently or in groups through the heating power adjustment component (9).

4. The degreasing box furnace for photocurable ceramics according to claim 3, characterized in that: The control and data processing component (11) uses the average temperature of the central temperature measuring point as the main control temperature, and sets constraints on the upper / lower temperature difference and the circumferential temperature difference. When the temperature difference exceeds the threshold, the power of the left and right heating zones is compensated and adjusted.

5. The degreasing box furnace for photocurable ceramics according to claim 1, characterized in that: The inert gas inlet component (5) is provided with a flow-blocking structure on the inner side of the inlet to reduce the inlet jet velocity and promote uniform gas distribution.

6. The degreasing box furnace for photocurable ceramics according to claim 1, characterized in that: The exhaust gas online analysis component (10) includes at least two of the following: a VOC / total hydrocarbon detection unit, a CO / CO2 detection unit, and an O2 detection unit.

7. The degreasing box furnace for photocurable ceramics according to claim 6, characterized in that: The gas release intensity index G is obtained by combining at least two of the change rates of any one of the following indices: VOC / total hydrocarbon concentration, CO concentration, CO2 concentration, and O2 concentration. The combination can be a linear combination or a nonlinear combination.

8. The degreasing box furnace for photocurable ceramics according to claim 7, characterized in that: The gas release intensity index G is obtained by combining at least two of the following: VOC / total hydrocarbon concentration, CO concentration, CO2 concentration, O2 concentration, and the rate of change of any of the above indices. The combination can be a linear combination or a nonlinear combination.

9. A method for real-time tail gas analysis and adjustment of a photocurable ceramic degreasing box furnace based on tail gas analysis and adjustment according to any one of claims 1-8, characterized in that: include S1: Load the light-cured ceramic green body into the furnace chamber (2), start the inert gas introduction component (5), and establish a controllable atmosphere and exhaust channel through the exhaust component (7); S2: Start the heating component (3) to heat up according to the preset temperature program, the temperature measuring component (4) collects the temperature of multiple points in the furnace, and the furnace pressure monitoring component (6) collects the furnace pressure. S3: The exhaust gas online analysis component (10) performs online detection of exhaust gas in the exhaust channel, and the control and data processing component (11) calculates the gas release intensity index G based on the exhaust gas detection data. S4: When G exceeds the threshold and / or the rate of change of G increases abnormally and / or the pressure inside the furnace exceeds the set range, the control and data processing component (11) automatically executes one or more linkage control strategies: reducing the heating rate and / or entering the heat preservation section, adjusting the inert gas flow rate, adjusting the exhaust capacity, and performing zone compensation for the heating power so that the gas release rate matches the exhaust capacity. S5: When G drops and stabilizes, the control and data processing component (11) automatically resumes heating or enters the next degreasing stage; S6: After degreasing is completed, cool and output the degreasing process data record.

10. The method according to claim 9, characterized in that: The linkage control strategy includes: a. Reduce the heating rate and / or enter the heat preservation section; b. Increase the opening of the exhaust valve to improve the discharge capacity; c. Increase the inert gas flow rate to enhance the carry-out capacity and suppress backflow; d. Adjust the heating power of the left and right zones to reduce the temperature difference.

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