Atmosphere tube furnace is a heating device widely used in materials science, metallurgy, chemical industry and other fields. It is used to process samples at high temperature in a specific gas environment. In order to ensure its long-term stable operation and extend its service life, a series of safety and technical specifications must be strictly followed in daily maintenance and regular overhaul. This article will introduce in detail the key points that should be paid attention to when overhauling atmosphere tube furnaces to help users establish a safe and reliable maintenance process.
1. Ensure power off and cooling
Before inspection, the power supply of the heating system and gas control system must be cut off, and a tester should be used to check whether the circuit is indeed without power, and wait for the furnace to completely cool to room temperature to avoid accidental injuries due to electric shock or burns. If flammable/toxic gases (such as H₂, CO, NH₃, etc.) have been introduced into the furnace, inert gases (such as N₂, Ar) must be introduced first to fully replace them to ensure that the residual gas concentration is below the safety threshold.
Wear high-temperature resistant gloves, goggles and gas masks (for harmful gas environments) to avoid direct contact with oxides or chemical deposits (which may be corrosive) on the surface of the furnace tube or heating element.
2. Inspection and maintenance of core components
Furnace tube and sealing system
Furnace tube status: Check whether the quartz or corundum furnace tube has cracks, deformation or leakage, especially pay attention to the high-temperature section. If damage is found, it needs to be replaced in time.
Sealing test: Confirm the effectiveness of flanges, O-rings, valves and other seals through pressure holding test (such as monitoring the pressure drop rate after filling with inert gas).
Heating element and thermal insulation layer
Resistance wire/silicon carbon rod: Observe whether there is breakage, oxidation peeling or local overheating discoloration, and measure whether the resistance value is within the nominal range.
Refractory material: Check whether the furnace insulation cotton or ceramic fiber collapses or pulverizes to avoid heat loss or uneven temperature.
Gas control system
Check the working status of flow meter, pressure reducing valve, and solenoid valve to ensure normal gas flow accuracy and switch response.
Clean impurities or carbon deposits in gas pipelines (especially pipelines used for a long time in reducing atmosphere).
3. Auxiliary system and function test
Temperature control system
Calibrate thermocouples (reference standard temperature source), check whether PID controller parameters drift, and ensure temperature control accuracy (such as ±1℃).
Test whether the overtemperature alarm and automatic power-off functions are effective.
Cooling and vacuum system (if equipped)
Check whether the water cooling jacket is blocked or leaking, and ensure that the circulating water flow is sufficient.
The vacuum pump oil level and filter status need to be replaced regularly, and the vacuum pipeline needs to be leaked (helium mass spectrometer or pressure holding method can be used).
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4. Verification and record after maintenanceNo-load trial operation
Gradually heat up to the rated temperature (such as 200℃, 500℃, 800℃ in sections), observe whether the heating curve is stable, and record the temperature difference of each section.
Introduce inert gas to simulate process conditions and check the stability of pressure and flow.
Document management
Record the maintenance content (such as replacement parts, calibration data), problems found and treatment measures in detail, and establish equipment maintenance files.5. Special precautionsAvoid pollution: If the furnace body is used for high-purity material processing, maintenance tools and cleaning agents must ensure that there is no oil or metal residue.
Environmental requirements: The maintenance area must be well ventilated and avoid operation in a confined space (especially when flammable gases are involved).
Professional collaboration: When it comes to complex electrical or gas circuit modifications, it is recommended to contact the equipment manufacturer or professional technicians.In summary, the maintenance of atmosphere tube furnaces involves many aspects, from basic safety protection to meticulous technical inspection, and every link cannot be ignored. By strictly implementing the above suggestions, not only can potential problems be discovered and solved in a timely manner, but the overall performance and reliability of the equipment can also be significantly improved. Regular professional maintenance is not only conducive to extending the service life of atmosphere tube furnaces, but also provides more stable support for scientific research and industrial production. If you need more information, please feel free to contact us.
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