In the fields of metallurgy, chemical engineering, power and other industries, high temperature, strong wear and tear, and easy leakage pose severe challenges to temperature measurement equipment. The wear-resistant and leak resistant thermocouple, with its unique design, has become a solution to this problem“Hardcore equipment”This article will analyze the core value of this industrial temperature measuring tool from two aspects: technological advantages and usage points.

1、 Three core advantages: anti-wear, leak proof, and high safety

1. Ultra hard wear-resistant head, facing particle erosion directly

Wear resistant and leak resistant thermocouples are made of high hardness alloy materials (such as chromium molybdenum alloy steelK1320Heat resistant and wear-resistant alloy, with a wear-resistant head hardness of up toHRC62-65Far beyond ordinary thermocouplesHRC40-45Standard. Taking a product produced by a manufacturer in Wuxi as an example, it uses vacuum smelting technology to forge integral drilling holes, with fewer processing defects and high casing hardness, and can withstand long-term erosion from particles such as fly ash and limestone. In circulating fluidized bed boilers, the service life of such thermocouples can reach that of ordinary products2-3Significantly reduce the frequency of equipment downtime and replacement.

2. Double sealed structure to prevent medium leakage

For leakage prone scenarios such as refineries and boiling furnaces, this product innovatively adopts“The card sleeve screw is stuck+The internal silk is stuck”Double sealing process. The card sleeve structure is fastened by mechanical interlocking and paired with high-temperature resistant rubber sealing rings (which can withstand)10MPaPressure is applied to block the penetration of media such as oil and gas through the gaps between the fibers. The measured data of a certain refinery reaction device shows that after adopting this design, the thermocouple oil leakage rate is higher than the industry average3%drop to0.1%The following significantly reduces safety hazards.

3. Explosion proof certification, suitable for high-risk environments

Product approvedd‖BT4/d‖CT5Explosion proof level certification, protection level up toIP65It can resist dust intrusion and low-pressure water spray. In1District2In areas with flammable gases (such as chemical fluidized beds), the shell material has been specially treated to withstand them-20℃to40℃temperature and80%Relative humidity ensures stable operation in explosive environments.

2、 Four key usage points: precise installation, scientific maintenance

1. Temperature measurement point selection: representative+anti-interference

Installation should follow“Reverse flow insertion”Principle: Insert the thermocouple facing the flow direction of the medium, ensuring that the measuring end is at the centerline of the flow velocity (such as fluid temperature measurement in a pipeline). If measuring solid temperature, the wear-resistant head should be tightly pressed against the surface of the material to reduce contact thermal resistance. The case of a kiln tail smoke chamber in a cement plant shows that correct installation can reduce temperature measurement errors±5℃Reduce to±1.5℃.

2. Compensation wire: polarity matching to avoid errors

The compensating wire should be consistent with the thermocouple scale (such asKType configurationKType compensation wire), and the polarity cannot be reversed. A coal mill in a certain power plant once caused a temperature measurement deviation due to the misuse of ordinary wires instead of compensating wires12℃Causing equipment malfunction. After proper connection, the error can be controlled within±0.5%Within.

3. Regular maintenance: cleaning+check

Clean the surface attachments of the protective tube (such as coal ash and oil stains) every quarter to prevent an increase in thermal resistance from causing the indicated temperature to be too low. Simultaneously check the aging condition of the sealing ring, and replace it immediately if cracks or deformations are found. The maintenance records of a boiling furnace in a certain chemical plant indicate that regular cleaning can extend the service life of thermocouples40%.

4. Explosion proof scenario: strictly follow the specifications

In the use of explosion-proof thermocouples, it is necessary to ensure the ambient temperature-20℃to40℃Relative humidity≤80%And it is not allowed to0Zone (continuous explosion hazard zone) for use. When operating, the power must be cut off before opening the junction box to avoid igniting flammable gases with electric sparks.

Conclusion

The wear-resistant and leak resistant thermocouple has achieved material innovation and structural optimization“Wear resistant, leak proof, high safety”Three major breakthroughs have made it a leader in the field of industrial high-temperature temperature measurementbenchmarkProduct. Scientific installation and standardized maintenance are the key to unleashing its performance potential. In the future, with the further application of surface modification technologies such as ion implantation of tungsten carbide, the wear resistance and service life of such thermocouples are expected to reach a new level, providing more reliable temperature data support for industrial intelligent transformation.