Correct maintenance wear-resistant thermocouple

Correct maintenance of wear-resistant thermocouple

wear-resistant thermocouple is book circulating fluidized boiler of power plant, boiling boiler, powder coal mill gasification furnace and a series of cement kiln head, preheater, furnace hood and chemical, smelting, such as high temperature wear resistance environment ideal for high tech products. The product has good vibration and abrasion resistance, corrosion resistance, high sensitivity, good stability, high accuracy, long life and other advantages, is the power plants, cement plants, chemical plants, and other areas of the high temperature wear resistance preferred temperature measuring protection tube.

wear-resistant thermocouple the purpose of cleaning is to remove surface dirt, improve its thermal coupling properties, extend the life of the thermocouple.

1。 Annealing

annealing is to eliminate internal stress in the electrode, wear-resistant thermocouple phase improves stability of thermocouple. Through proper annealing temperature and annealing time, can achieve the purpose of prayer. Annealing generally has two methods:, electric annealing furnace annealing.

2, cleaning

( 1) Sodium borate cleaning

wear-resistant thermocouple used sodium borate cleaning after acid pickling. Wear-resistant thermocouple first electrode hangs on the platinum wire annealing on the ark, and then to adjust current, make very hot thermocouple to 1100 & deg; C。 With block sodium borate hit a hot spot, who make the boric acid solution down along the electrode, slowly reduce current after cleaning, the last cut off the power and take footwall in 80 mm diameter circle into a beaker, several times with distilled water to boil, completely precipitate boric acid salt. Sodium borate clear purpose is mainly appeal insoluble in hydrochloric acid and metal oxide. As a result of sodium borate in high temperature melting and wear-resistant thermocouple attached to hot metal impurity on the electrode and metal oxide generated solution boron glass, suitable hot electrode outflow, reach the purpose of clearing the outer electrode contamination.

( 2) Pickling

use acid oxidation ability, can remove organic matter on the surface of the thermocouple and other impurities by acid dissolution.

the wear-resistant thermocouple plate into a circle about 80 mm in diameter in the beaker, import - 30% 50% ( According to the volume ratio) Chemical pure dilute hydrochloric acid ( Or dilute nitric acid) One hour, take out into a beaker, thoroughly with distilled water for a few times to remove the acid. The purpose of pickling was part cleaning electrode surface oxide and organic materials.