Designed specifically for harsh industrial environments with severe wear and high particle erosion, the abrasion-resistant thermocouple series utilizes high-strength protective tubes and advanced surface modification technologies. It effectively meets temperature measurement requirements in circulating fluidized bed (CFB) boilers, bubbling fluidized bed boilers, petrochemical plants, coal conveying systems, cement clinker production, and refractory material handling – all applications involving flowing bulk solids and particulate media. In CFB boiler service, the thermocouple has demonstrated an operational service life of over one year.
- Six Types of Abrasion-Resistant Protection Tubes
Depending on operating temperature and wear intensity, the following protection tube options are available:
1. Wear-Resistant Superalloy
Vacuum-melted, forged and integrally drilled from a specially formulated alloy. This option exhibits minimal processing defects, excellent high-temperature strength, and outstanding oxidation resistance, ensuring high reliability. Operating temperature range: 800–1200°C.
2. Composite Cast Wear-Resistant Alloy
Manufactured by precision casting a high-temperature alloy matrix reinforced with wear-resistant particles. This type requires no post‑machining, offers high hardness and oxidation resistance, and provides a cost‑effective solution. It is the most widely used abrasion-resistant sheath. Operating temperature: 800–1200°C.
3. Ion‑Implanted Tungsten Carbide (WC)
Applied to a stainless steel substrate via ion implantation, this technology infuses tungsten carbide particles into the surface to form a high‑hardness wear layer (0.5–1.5 mm thick). The resulting structure is hard on the outside and tough on the inside, with good corrosion resistance and excellent surface quality. Minimum diameter can reach φ8. Operating temperature: 0–800°C. In coal pulverizer applications at power plants, service life exceeds two years.
4. Composite Ceramic Wear‑Resistant Sheath
Fabricated by high‑temperature hot extrusion and resilient filling techniques that bond ceramic materials to a stainless steel substrate. This design is simple in construction and cost‑effective. Operating temperature: 0–800°C.
5. Surface Overlay Welding of Wear‑Resistant Microstructures
A stainless steel substrate overlaid with carbides or other wear‑resistant microstructures to enhance surface hardness.
6. Spray‑Coated Wear‑Resistant Particles
A stainless steel substrate with a sprayed coating of combined wear‑resistant particles to improve abrasion resistance. (This process presents greater manufacturing challenges and lower reliability, and is now being phased out gradually.)
- Typical Application Scenarios
Circulating fluidized bed (CFB) boilers – bed temperature measurement, cyclone inlet and outlet flue gas temperature monitoring
Cement rotary kilns – kiln inlet, kiln outlet, and preheater temperature monitoring
Petrochemical catalytic cracking units and reactors handling particulate streams
Coal conveying systems, coal pulverizers, and powder transport pipelines in coal chemical plants
Temperature measurement of high‑temperature flowing materials such as refractories and clinker
The product series offers flexible selection based on actual operating conditions, with a variety of abrasion‑resistant materials and mounting configurations to suit different temperature, pressure, and wear severity requirements. For custom solutions or detailed selection documentation, please contact the manufacturer.