High temperature vertical tube furnace leaks gas

Air leakage in high-temperature vertical tube furnaces is a key issue that affects experimental safety and data accuracy. It may be caused by seal failure, welding defects, material aging, or design defects, and requires systematic investigation and targeted repair to solve. The following are specific reasons and solutions:

1. Analysis of the causes of gas leakage
Sealing failure:
Aging of sealing gasket: Under long-term high temperature environment, the sealing gasket may age, harden or deform, resulting in poor sealing.
Loose flange connection: The flange connection bolts may loosen due to vibration or thermal expansion and contraction, leading to gas leakage.
Sealing glue failure: If high-temperature resistant glue is used for sealing, the glue may fail due to high temperature or oxidation.
Welding defects:
Incomplete penetration of weld seam: During the welding process, the weld seam may not be fully penetrated, resulting in small pores or cracks that can cause gas leakage.
Welding cold cracks: Some materials may develop cold cracks after welding, especially under low temperature or rapid cooling conditions.
Material aging:
Corrosion of furnace materials: Prolonged exposure to high temperatures, corrosive gases, or humid environments may cause corrosion of furnace materials, leading to gas leakage.
Heating element damage: Heating elements (such as silicon molybdenum rods) may be damaged due to aging or overheating, resulting in gas leakage.
Design defects:
Unreasonable structure: There may be defects in the furnace design, such as inadequate design of gas circulation areas, which can lead to gas accumulation and leakage in specific areas.
Improper material selection: The furnace material may not be suitable for specific experimental conditions, such as high temperatures, corrosive gases, etc., leading to gas leakage.

2. Solution to air leakage
Check and replace the seals:
Regularly check the sealing performance of sealing gaskets, flange connection bolts, and high-temperature resistant adhesives, and replace aging or damaged seals in a timely manner.
Ensure that the flange connection bolts are evenly secured with force to avoid loosening.
Repair welding defects:
Perform non-destructive testing on welds, such as X-ray or ultrasonic testing, and promptly repair defects such as incomplete penetration or cold cracks.
Adopt appropriate welding techniques and materials to ensure the quality of the weld seam.
Replace aging materials:
Regularly inspect the corrosion of furnace materials and replace severely corroded components in a timely manner.
Regularly inspect the heating element and replace it promptly if any damage is found.
Improved design:
Optimize the furnace structure to avoid gas accumulation in specific areas.
Select furnace materials suitable for experimental conditions, such as high-temperature resistant and corrosion-resistant alloy materials.
Using professional testing tools:
Use soap water or specialized detection solution to detect gas leaks in the furnace body and quickly locate the leak point.
Mark and record the detected leaks for subsequent repair.

3. Preventive measures
Regular maintenance:
Develop a regular maintenance plan to conduct comprehensive inspections and maintenance of the furnace body.
Clean up the residue in the furnace tube and keep the furnace clean.
Standardized operation:
Strengthen training for operators to ensure they are familiar with equipment performance and operating procedures.
Avoid opening or moving the lid when the furnace temperature is high to reduce damage to the seals.
Choose high-quality accessories:
Choose high-temperature resistant adhesives and seals with excellent temperature resistance, adhesive strength, oxidation resistance, and corrosion resistance.
Ensure that the quality of accessories meets the experimental requirements and avoid air leakage caused by accessory quality issues.