As the popularity of circulating fluidized bed (CFB) boiler used in Chinese power industry, it is a priority task to adopt anti-high temperature, anti-corrosion, anti-abrasion furnace thermocouple to control inner boiler temperature. Circulating fluidized bed boiler temperature control points are mainly as following:

1. Main bed of Fluidized bed

Fluidized bed dense phase region，temperature range 0～1100℃. Medium contains pulverized coal and H2S、SO2、NH3、CO2 strong corrosive gas. The washing strength of fluidized material is very strong.

Fluidized bed rare region, temperature range 0～1100℃.The fluidized material has strong washing strength and contains corrosive gas.

2. Entrance of cyclone separator, temperature range 0～900℃. There is high-speed airflow about 25～27m/s at entrance and contain granular media. It has strong washing strength.

3. fluidized bed slag cooler, temperature range 0～800℃ and contain granule and CO、CO2、SO2、H2S corrosive gas.

In view of the above measure environment, the company develops a new generation thermocouple which is anti-high temperature, anti-corrosion and anti-wear. The product is durable, safe, reliable and long life. it is used to measure temperature within 0～1300℃. It is a un-instead thermocouple protection tube which made in alumina, aluminum, graphite, oxides of silicon carbide and other materials. It is the first choice temperature sensor in circulating fluidized bed boiler.