Wear-resistant thermocouple
Main Specifications:
1. Temperature range: 0～1250°C
2. Wear resistance: (HRC) ≥ 60
3. Washable: 30M/S
4. Anti-corrosion: resistant to CO, CO2, SO2, H2S, NH3 and other corrosive gases
5. Spray coating density: >98%
6. Basic strength: ≥30Mpa
Outer casing specification: ф18～34m/m
The product is durable, safe and reliable, has long service life, good catastrophic performance, high heat transfer coefficient, oxidation resistance, thermal shock resistance, high temperature resistance, corrosion resistance, erosion resistance, no nodulation, no slagging, convenient installation and use, and can be used for The special temperature measurement occasions with temperature measurement of 0～1300°C are products that cannot be replaced by the existing thermocouple protection tubes of corundum, high aluminum, graphite, oxide silicon carbide and other materials. It is the preferred temperature sensor for circulating fluidized bed boilers.
1. The surface hardness of the MVD-treated tungsten-carbon alloy reaches Rockwell HRC76 (about 1750 Vickers, ceramic grade) which is 8 times the hardness of ordinary stainless steel. Ordinary wear-resistant material hardness is below HRC60. 2. The creepage point of the sheath metal is 1850~2050 °C; the melting point is 2100 °C, and no bending deformation occurs under the temperature of 1800 °C.
3. The surface alloy layer is integrated with the base stainless steel, so the coefficient of thermal expansion and the hot brittleness are exactly the same, and cracking does not occur at high temperatures.
4. Oxide protective film formed at high temperature effectively prevents oxidation corrosion of So2 and other gases.
With the popularization of circulating fluidized bed (CFB) boilers in China's power industry, it is imperative to use the ideal high temperature, corrosion and wear resistant thermocouples to monitor furnace temperature. The circulating temperature control points of circulating fluidized bed boilers mainly include:
1. Fluidized bed main bed
The dense phase zone of the vulcanized bed (at the distribution plate), the temperature range is 0～1100°C, the medium contains coal powder coal, and contains a large amount of H2S, SO2, NH3, CO2 strong corrosive gas generated by combustion, and the material flushing force in the fluidized state Very strong.
The fluidized bed is in a dilute phase zone with a temperature range of 0 to 1100 ° C. The material in the vulcanized state has a strong scouring force and contains corrosive gases.
2. The inlet and outlet of the cyclone separator and the return feeder
The temperature range is 0-900 ° C, the high-speed air flow of about 25 ~ 27 m / s at the entrance, and containing granular media, has a very strong flushing force.
3. Fluidized bed slag cooler
The temperature range is from 0 to 800 ° C, and contains particles and corrosive gases such as CO, CO2, SO2 and H2S.
Common thermocouple materials
Thermocouple indexing number Hot electrode material Operating temperature range (°C)
Positive Negative
S Platinum-rhodium alloy (铑 content 10%) Pure platinum 0-1400
R Platinum-rhodium alloy (铑 content 13%) Pure platinum 0-1400
B Platinum-rhodium alloy (铑 content 30%) Platinum-rhodium alloy (铑 content 6%) 0-1400
K Nickel Chromium Nickel Silicon -200-+1000
T pure copper copper nickel -200-+300
J iron copper nickel -200-+600
N nickel chrome silicon nickel silicon -200-+1200
E Nickel Chromium Copper Nickel -200-+700