Correct Maintenance Method of Wear Resistant Thermocouple
Release time：2017-10-03 Clicks：653
Wear-resistant thermocouple is the power plant circulating fluidized set boiler, boiling boiler, pulverizer gas furnace and cement plant series kiln head, kiln tail, furnace hood and chemical, smelting and other high-temperature wear environment is ideal for high-tech Special products. The product has anti-vibration, wear resistance, corrosion resistance, high sensitivity, good stability, high accuracy, long life and other advantages, is the current power plant, cement plants, chemical smelters and other high temperature wear area preferred temperature measurement protection tube.
The purpose of wear-resistant thermocouple cleaning is to remove the surface dirt, improve its thermocouple characteristics, extend the life of thermocouples.
Annealing
Annealing is to remove the internal stress in the electrode, improve the wear resistance of the thermocouple crystal phase to improve the thermocouple stability. Through the appropriate annealing temperature and annealing time, you can achieve the desired purpose. Usually there are two ways to anneal: power annealing, furnace annealing.
2, cleaning
(1) sodium borate cleaning
After the use of wear-resistant thermocouple after pickling after sodium borate cleaning. Place the wear-resistant thermocouple electrode on the platinum wire on the cabinet, then adjust the current so that the thermocouple is burning to 1100 ° C. With the block of sodium borate touch hot spots, so that boric acid who solution along the electrode flow, after cleaning slowly reduce the current, then cut off the power, remove the disc into a circle of 80 mm diameter into the beaker, boiled several times with distilled water, Dig out borate. The purpose of sodium borate removal is mainly the atmosphere is insoluble in hydrochloric acid metal and oxide. As the sodium borate melting at high temperature and attached to the wear-resistant thermocouple thermal electrode on the metal impurities and metal oxides generated boron glass solution, along the heat electrode flow to achieve the purpose of removing the electrode outer dirt.
(2) pickling
The use of acid oxidation capacity, remove the thermocouple surface of the organic matter and acid can be dissolved in other impurities.
The wear-resistant thermocouple disk into a diameter of about 80mm circle placed in a beaker, into 30% -50% (by volume ratio) chemical pure hydrochloric acid (or dilute nitric acid) for one hour, remove and put into the beaker, boiled with distilled water Several times to completely remove the acid. The purpose of pickling is to clean the surface of the electrode part of the organic matter and oxide.
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