Wear-resistant thermocouple

Due to the use of different high-strength wear-resistant protective tubes and surface modification measures for different temperature ranges and tested media, this series of products forms a composite tube type solid structure. It is suitable for temperature measurement of flowing powders and materials such as petrochemicals, coal transportation systems, fluidized bed boilers, cement mature materials, and refractory materials with severe wear of protective tubes. Further improve the service life of thermocouples. Its performance is superior to the current oneWear-resistant thermocoupleReceived high praise from users. With multiple high-tech products at the international level, its special wear-resistant materials solve the service life of temperature measurement thermocouples in circulating fluidized bed boilers without affecting temperature hysteresis. The protective sleeve has many technologies such as wear resistance, high temperature oxidation resistance, sulfur resistance, corrosion resistance of liquid iron powder, limestone and other cement materials, erosion resistance, and vibration resistance, making the service life of temperature measurement thermocouples generally one to two years.

In industrial sites such as coal powder furnaces, ball mills, and cement plants, armored or high-temperature armored cores are used, matched with wear-resistant sleeves of different materials and specifications, which have good wear resistance, vibration resistance, and thermal shock resistance. In various harsh environments with high levels of wear, the service life of products can be several times longer than ordinary products, greatly improving production efficiency and reducing cost consumption. Using special heat-resistant and wear-resistant alloy materials as the measuring outer protective tube and wear-resistant head, with an armored core inside, it not only has high corrosion resistance to fly ash particle erosion, but also can measure temperature between 0-1400 ℃ for a long time. It is an ideal temperature sensor for use in high-temperature and wear-resistant environments in the metallurgical industry.

Special heat-resistant materials and wear-resistant alloy materials are used as temperature measuring sleeves and wear-resistant heads. Depending on the measured temperature, the selected wear-resistant protective tube material is also different. It adopts flange connection or threaded connection method, and can be used for temperature measurement in the range of 0-1400 degrees for a long time. It is an ideal temperature sensor used in high temperature and wear-resistant environments in metallurgy, chemical industry, cement plants, power plants, and fluidized bed boiler industries, with a maximum service life of up to two years. The components of the wear-resistant head include wear-resistant head, connecting rod, threaded connection or flange, junction box, and armored core. The wear-resistant head should be selected based on the actual temperature at the production site, while the connecting rod, threaded connection or flange should be selected based on the presence of corrosive media on site.

Characteristic editing can be divided into the following three categories based on the material of wear-resistant sleeves, and each category has its own characteristics:

1. Wear resistant high-temperature alloy: A specialized wear-resistant high-temperature alloy specially designed for explosion-proof thermocouples based on the characteristics of high-temperature wear environments. It is made by vacuum smelting and has high resistance to high-temperature oxidation and high high-temperature strength. It is forged and drilled as a whole. Low processing defects, high reliability, good comprehensive performance of high temperature strength and wear resistance, high price, and operating temperature of 800-1200 ℃.

2. Composite casting wear-resistant alloy: using composite armor technology to add wear-resistant particles to a high-temperature alloy matrix and precision melt casting. No turning is required, the casing has high hardness and resistance to high-temperature oxidation. The magnetic flap level gauge has some casting defects but does not affect high-temperature wear resistance and sealing. It is the most common high-temperature wear-resistant casing used, with a moderate price and a temperature range of 800-1200 ℃.

3. Ion implantation of tungsten carbide: Using stainless steel as the substrate, tungsten carbide particles are injected into the surface of the casing through ion implantation technology. It has high hardness, high strength, and high toughness, especially wear-resistant, with a wear-resistant layer thickness of 0.5-1.5mm. It is hard on the outside and tough on the inside, with a minimum diameter of up to φ 8. The surface quality is good, and the operating temperature is 0-800 ℃. It has a service life of more than 2 years in coal mills in power plants.

Main technical parameters

Electrical outlet: M20 × 1.5, NPT1/2

Wear resistant head hardness: HRC60-65

Protection level: IP65

Insulation resistance>100M Ω (at room temperature)

Test voltage: 500VDC

Connection size: M27 × 2 NPT3/4

Accuracy level: Level I

Material comparison

1. Metal ceramic wear-resistant: using recrystallized silicon carbide metal ceramic protective tube, high temperature can reach 1300 ℃, equipped with K-index or S-index armored core, specially suitable for temperature measurement of high temperature and strong wear-resistant working conditions such as cement kiln tail and circulating vulcanization bed.

Material composition: SiC

Operating temperature: 0-1600 ℃

　　Wear-resistant thermocouple2. Special wear-resistant for hot blast stove: using a new type of silicon carbide metal ceramic protective tube, the high temperature can reach 1300 ℃, and the inner core is an S-division or B-division high-temperature armored core, specially suitable for temperature measurement in hot blast stove occasions.

Material composition: SiC

Operating temperature: 0-1600 ℃

3. High temperature alloy wear-resistant head with armored core, which has high corrosion resistance to fly ash particle erosion, is an ideal temperature sensor for use in high-temperature and wear-resistant environments in the metallurgical industry.

Material: K1320 heat-resistant and wear-resistant alloy

Temperature: 0-1200 ℃

4. High temperature alloy wear-resistant 2: Using special heat-resistant and wear-resistant alloy materials as temperature measuring outer protective tubes, with armored cores inside, it has high corrosion resistance to particle erosion and is an ideal temperature sensor for use in high-temperature and wear-resistant environments in the metallurgical industry

Material: 3YC52 or GH3030 heat-resistant and wear-resistant alloy

Temperature: 0-1200 ℃

5. Iron aluminum ceramic protective tube

Iron based materials containing aluminum and cleverly adding A12O3 powder can produce iron aluminum ceramic (TLC) with special gold content. By making the iron aluminum ceramic alloy into a thermocouple (resistor) protective tube, it becomes the most critical component of the iron aluminum ceramic thermocouple (resistor) - the iron aluminum ceramic protective tube. According to the working temperature, wear condition, medium type, pressure equation, different series of iron aluminum ceramic protective tubes are made. There are currently six series: TLC, TLC1, TLC2, TLC3, TLC4, and TLC5.

TLC type: resistant to hydrochloric acid, nitric acid, sulfuric acid, sodium hydroxide, and potassium hydroxide solutions. The working temperature is divided into two types: 350 ° C and 750 ° C.

TLC1 type: resistant to oxidation, sulfurization, and zinc steam corrosion, with high wear resistance, good heat and earthquake resistance, working temperature of 1100 ° C. After actual use, it has a service life of 4 months in zinc concentrate boiling furnaces, 12 months in pyrite boiling furnaces, 6 months in boiling furnaces and circulating fluidized bed boiler halls, and 6-8 months in ball mills and fan mills inlet and outlet.

TLC2 type: Operating temperature of 1250 ° C, with lower wear resistance than TLC1 type. Compared with ceramic tubes, it has excellent technical indicators such as thermal shock resistance, high temperature thermal strength, and working pressure (16MPa), making it particularly suitable for thermocouple protection tubes with a division number of S at 1250 ° C.

TLC3 type: Improved from TLC2 type, it not only has the characteristics of TLC2 type, but also has a special improvement in wear resistance. Under the same working conditions, it can increase the service life by twice. The working temperature is 1300 ° C.

TLC4 type: derived from TLC1 type, in addition to possessing the characteristics of TLC1 type, it has a special improvement in wear resistance, far higher than TLC1 type. Under the same working conditions, it can increase the service life by three times, with a working temperature of 1100 ° C. Through practical use, the service life of the protective tube used for temperature measurement at the inlet and outlet of the ball mill can reach 36 months.