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technical article
What is the classification of wear-resistant thermocouples
2012-1-31 9:05:59


Overview of wear-resistant thermocouples;

Due to the use of different high-strength wear-resistant protective tubes and surface modification measures for different temperature ranges and measured media, a composite tube-type solid structure is formed. This series of products are suitable for petrochemicals that have severe wear on the protective tube.

Temperature measurement of mobile powder and materials such as coal conveying systems, fluidized bed boilers, cement clinker and refractory materials. Further increase the life of the thermocouple. ,博得用户好 Its performance is better than the current wear-resistant thermocouples , which wins users

Comment. Has a number of high-tech products at the international leading level, its special process of wear-resistant materials without affecting the temperature measurement hysteresis, completely solve the circulating fluidized bed boiler temperature measurement thermocouple service life, protective sleeve

The tube has many technologies such as abrasion resistance, high temperature oxidation resistance, sulfuration resistance, corrosion resistance to cement materials such as liquid iron powder, limestone, erosion resistance, and vibration resistance, which makes the service life of temperature measuring thermocouples generally one to two years.

根据材质分类 Wear-resistant thermocouples are classified according to material

1. Cermet wear resistance: It adopts recrystallized silicon carbide cermet protection tube, high temperature can reach 1300 ℃, and it is equipped with K index or S index armoured core, which is specially suitable for high temperature and high temperature resistance of cement kiln tail and circulating vulcanized bed Grinding conditions

Temperature measurement.


Material composition: SiC


Operating temperature: 0 ~ 1300 ℃


2. Special wear resistance for hot blast stove: Adopt new type silicon carbide metal ceramic protection tube, high temperature can reach 1300 ℃, the inner core is S index or B index high temperature armored core, specially suitable for temperature measurement in hot blast stove.


Material composition: SiC


Operating temperature: 0 ~ 1300 ℃


3. High-temperature alloy wear resistance 1: Special heat-resistant and wear-resistant alloy material is used as the temperature measuring outer protection tube and wear-resistant head, and the armor core is built in, which can have high corrosion resistance to scouring of fly ash particles. At high temperatures

Provides good protection for the inner core under conditions. It adopts flange or thread connection type, which can measure temperature between 0∽1200 ℃ for a long time. It is ideal for metallurgy industry to be used in high temperature and wear-resistant environment.

Temperature Sensor.

Material: K1320 heat-resistant and wear-resistant alloy


Temperature: 0 ~ 1200 ℃


4. High-temperature alloy wear resistance 2: Special heat-resistant and wear-resistant alloy materials are used as temperature-protection outer protection tubes, and the armor core is built in. It has high corrosion resistance to particle erosion, and can resist high-temperature conditions. Inner core is good

Good protection. It adopts flange or thread connection form, which can measure temperature between 0∽1200 ℃ for a long time. It is an ideal temperature sensor for high temperature and wear-resistant environment in metallurgical industry.


Material: 3YC52 or GH3030 heat-resistant and wear-resistant alloy


Temperature: 0 ~ 1200 ℃


5, iron aluminum porcelain protection tube


The iron base contains aluminum and skillfully adds A12O3 powder to obtain iron-aluminum-ceramic (TLC) with special gold. The iron-aluminum-ceramic alloy is made into a thermocouple (resistance) protection tube, and it becomes the most ferro-aluminum porcelain thermocouple (resistance) The key part-iron aluminum porcelain protection tube. root

According to the working temperature, wear conditions, media types, pressure and other conditions, different series of iron-aluminum-ceramic protection tubes are made. The existing series: TLC, TLC1, TLC2, TLC3, TLC4 and TLC5.


TLC type: resistant to hydrochloric acid, nitric acid, sulfuric acid, sodium hydroxide, potassium hydroxide solution. The working temperature is divided into 350 ° C and 750 ° C.


TLC1 type: oxidation resistance, sulfuration resistance, zinc vapor corrosion resistance, high abrasion resistance, good thermal shock resistance, working temperature 1100 ° C. After practical use, the life of the zinc concentrate boiling furnace is 4 months,

The service life of the furnace is 12 months, the service life of the boiler and the circulating fluidized bed boiler is 6 months, and the service life of the ball mill and fan mill is 6-8 months.


TLC2 type: working temperature 1250 ° C, wear resistance is lower than TLC1 type, compared with ceramic tube thermal shock resistance, high temperature heat resistance, working pressure (16MPa and other technical indicators are far ahead, especially suitable for 1250 ° C minutes Degree number

S thermocouple protection tube.


TLC3 type: Improved from TLC2 type. In addition to the characteristics of TLC2 type, it has a special improvement in wear resistance, which is much higher than TLC1 type. Under the same conditions, the life can be doubled. Operating temperature is 1300 ° C.

TLC4 type: Inevitable succession from TLC1 type. In addition to the characteristics of TLC1 type, it has a special improvement in wear resistance, which is much higher than TLC1 type. Under the same working conditions, it can increase the life by three times and the working temperature. 1100 ° C.

After practical use, the life of the protective tube for the temperature measurement of the ball mill inlet and outlet can reach 36 months.


测量误差出现的主要影响因素 Main influencing factors of measurement error of wear-resistant thermocouple


1Influence of insertion depth <


1) Selection of temperature measurement point


The installation position of the thermocouple, that is, the selection of the temperature measurement point is the most important. The location of the temperature measurement point must be typical and representative for the production process, otherwise the significance of measurement and control will be lost


2) Insertion depth


When a thermocouple is inserted into the measurement site, a heat flow is generated along the length of the sensor. There is heat loss when the ambient temperature is low. As a result, the temperature of the thermocouple and the measured object are inconsistent, resulting in a temperature measurement error. 2 responses

Influence of time


The basic principle of temperature measurement by contact method is that the temperature measuring element must achieve thermal equilibrium with the measured object. Therefore, it is necessary to maintain a certain time during temperature measurement to achieve thermal equilibrium between the two. The holding time is the same as the temperature measuring element.

The thermal response time is related. The thermal response time depends on the structure of the sensor and the measurement conditions. For gaseous media, especially stationary gas, it should be maintained for at least 30 minutes to reach equilibrium;

For liquids, the fastest time is more than 5min. For the measured place with constant temperature change, especially the instantaneous change process, the whole process is only 1 second, and the response time of the sensor is required in the millisecond level. Therefore, ordinary temperature transmission

The sensor not only can't keep up with the temperature change rate of the measured object, but also causes measurement error because it can't reach the thermal equilibrium. It is best to choose a sensor that responds quickly. For thermocouples, in addition to protection tube effects, thermocouples

The diameter of the measuring end is also the main factor, that is, the thinner the wire, the smaller the diameter of the measuring end, and the shorter the thermal response time. The thermal response error of the temperature measuring element can be determined by the following formula.