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Why Choose Wear-resistant Thermocouples Under Special Circumstances

Dec 17, 2018

Why choose wear-resistant thermocouples under special circumstances

The wear-resistant material melts and vaporizes the base metal (for example, 601 stainless steel) and the tungsten carbon compound at the metal surface of the alloy substrate by high-voltage electric pulse to generate local ultra-high temperature, and then rapidly fuses the two, and cools the whole process. Completed in an instant. Industrial sites such as pulverized coal furnaces, ball mills, and cement plants use armored or high-temperature armored cores with wear-resistant casings of different materials and specifications. They are resistant to wear, vibration, and thermal shock. In the harsh environment where the degree of wear is extremely high, the service life of the product is several times higher than that of the ordinary product, which greatly improves the production efficiency and reduces the cost. It adopts special heat-resistant and wear-resistant alloy materials as the outer protective tube and wear-resistant head, and the inner armor core can not only have high corrosion resistance to the scouring of fly ash particles, but also can be used for 0-1400 °C for a long time. Temperature measurement is an ideal temperature sensor for the metallurgical industry in high temperature and wear resistant environments.

The special material heat-resistant material and wear-resistant alloy material are used as the temperature measuring outer sleeve and the wear head. According to the measured temperature, the selected wear protection tube material is also different, and the flange connection or the screw connection method can be used. Long-term use of temperature measurement in the range of 0-1400 degrees, is the most ideal measurement temperature sensor used in metallurgy, chemical industry, cement plant, power plant, fluidized bed boiler industry in high temperature and wear-resistant environment, the service life can be up to Two years. The components include wear-resistant heads, connecting rods, threaded connections or flanges, junction boxes, and armored cores. The wear heads should be selected according to the actual temperature of the production site. Connecting rods, threaded connections or flanges should be based on the site. No corrosive media to choose material.

Why choose wear-resistant thermocouples under special circumstances

1,Main features of wear-resistant thermocouples:

(1). Abrasion-resistant material process: The wear-resistant material melts and vaporizes the substrate metal (for example: 601 stainless steel) and tungsten carbon compound at the same time by high-voltage electric pulse on the metal surface of the alloy substrate, and then vaporizes; The fusion, cooling, the entire process is completed in an instant. Ensure that the new alloy layer produced has a very high hardness (C76) and the thickness of the alloy layer can be up to 0.12" (3mm). Different from the metal coating, a metal is attached to the substrate, but on the substrate. The metal surface regenerates a new alloy which is essentially a single body and therefore has a greatly improved wear resistance.

(2). The surface hardness of the treated tungsten-carbon alloy reaches Rockwell HRC76 (about 1750 Vickers, ceramic grade) which is 10 times the hardness of ordinary stainless steel.

(3), wear-resistant thermocouple The surface alloy layer and the substrate stainless steel to form a whole, so the coefficient of thermal expansion and brittleness are exactly the same, will not crack at high temperatures.

(4), High temperature resistance, wear-resistant alloy layer temperature resistance up to 1800 ° C, long-term can be used at 1200 ° C temperature.

(5). Because it is a tungsten carbon compound, its oxidation resistance is twice that of 316 stainless steel.

(6)The wear-resistant thermocouple has a long service life and the shelf life is 12 months on the temperature of the CFB boiler.

 2, Product overview:

The special thermocouple/thermal resistance structure is specially designed for different occasions. It can directly measure liquid, vapor and gas media and solid surface temperature in the range of -200 to 1600 degrees.

Special thermocouples / thermal resistors mainly include:

Platinum rhodium thermocouple

Miniature thermocouple / resistance

Micro armored thermocouple

Pressure spring fixed thermocouple

Socket type thermal resistance

Right angle elbow thermocouple

3, The working principle of thermal resistance

Thermistor temperature measurement is based on the fact that the resistance value of a metal conductor increases as the temperature increases. Most of the thermal resistance is made of pure metal materials, and currently the application of zui is platinum and copper.

The thermal resistance is a temperature detector commonly used in the medium and low temperature zone. Its main features are high measurement accuracy and stable performance. Among them, the measurement accuracy of platinum thermal resistance is high, it is not only widely used in industrial temperature measurement, but also made into a standard reference instrument.

Why choose wear-resistant thermocouples under special circumstances

4,The working principle of thermocouple

Two different conductors (called thermocouple wire or hot electrode) are joined at both ends into a loop. When the temperature of the joint is different, an electromotive force is generated in the loop. This phenomenon is called thermoelectric effect. The electromotive force is called the thermoelectric potential. Thermocouples use this principle for temperature measurement. The one that is directly used to measure the temperature of the medium is called the working end (also called the measuring end), the other end is called the cold end (also called the compensating end); the cold end and the display The instrument or the supporting instrument is connected, and the display meter indicates the thermoelectric potential generated by the thermocouple.

A thermocouple is actually an energy converter that converts thermal energy into electrical energy and measures the temperature with the generated thermoelectric potential.