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Over the years, Shanghai Yunou has conducted a number of researches and studies on the material of thermocouples with high temperature resistance and erosion resistance. Combined with the characteristics of foreign cement production technology, after many experiments and online use, it has been confirmed that NM recrystallization thermocouples have a service life It has the advantages of long length, good sudden change performance, high thermal conductivity coefficient, oxidation resistance, thermal shock resistance, high temperature resistance, corrosion resistance, erosion resistance, no nodulation, no slag formation, easy installation and use, etc. It can be used for special measurement of 600 ～ 1200 ℃ In the case of temperature, it is irreplaceable by the current thermocouple protection tubes made of corundum, high aluminum, graphite, silicon oxide oxide and other materials.
The advent of NM alloy steel protection tube thermocouples not only solved a major problem in the wear-resistant temperature measurement control of China's cement industry, but also brought considerable economic benefits to all users.
High precision and long service life.
Good catastrophe performance and high thermal conductivity.
Anti-oxidation and corrosion resistance.
Resistance to thermal shock and high temperature.
No nodules and no slag.
4-8mm tube wall thickness.
Quick response function, strong stability.
Any optional length of protection tube.
It can be used without preheating.
Various installation methods suitable for each user.
Optional local display.
Optional built-in transmitter function.
Anti-interference ability during long distance transmission.
The use of environmental temperature range is wide, the work is stable and reliable.
2. No-piece temperature measurement range and allowable error
45%. For thermocouples with a length of more than 1 meter, the product of its insulation resistance at room temperature and its length is not less than 100MΩm. That is, Rr L≥100 MΩm L> 1m where: Rr-thermocouple's insulation resistance value at room temperature, L-thermocouple length. For a thermocouple with a length equal to or less than 1 meter, its normal temperature insulation resistance value should not be less than 100MΩ.
NM alloy steel thermocouple protection tube is a new type of alloy silicon material. The pores in the material are completely filled with metal silicon, the porosity is close to zero, high strength, corrosion resistance, wear resistance, oxidation resistance, and long service life. The new material has a strength of 5 to 10 times higher than that of the general 3039H and 0Cr25Ni20 materials.
2. Excellent anti-oxidation performance:
As the porosity is close to zero, the oxidation resistance of NM alloy steel is greatly improved, and the service life of high temperature can be extended by 3 to 10 times. Once this metal silicon carbide is heated to a high temperature, a thin oxide protective film is naturally formed on the surface. Even if this film is damaged, it will automatically regenerate and heal at high temperature, so that the deterioration of oxidation will hardly occur.
3. High radiant heating efficiency: The far-infrared radiance of NM metal silicon carbide is close to that of a complete black body. Using it for heat radiation parts will greatly improve the thermal efficiency of the parts.
4. Excellent resistance characteristics:
Generally, the wear resistance cannot be guaranteed as an insulator, but the NM metal carbon silicon material has good conductive properties and has the function of releasing static electricity, which is suitable for occasions with many required characteristics.
5. High wear resistance:
NM alloy steel has a hardness of Hv> 27Gpa, has a very low wear rate and friction coefficient in various media, and has a self-lubricating effect. The material has excellent wear resistance at high temperatures and is particularly suitable for the special resistance of cement production lines Grinding temperature measurement occasions.
6. Excellent anti-corrosion performance: NM metal silicon carbide material has good anti-corrosion performance, resistant to acid medium corrosion under various temperature conditions, normal temperature alkaline medium corrosion.
7. The specific technical parameters are as follows:
NM series alloy steel thermocouple protection tube generally has a wall thickness of 4 to 8 mm (determined according to the temperature measurement site). The protective tube is specially designed for the cement plant, and its function is to extend the service life of the thermocouple at the temperature measurement points of C3, C4, C5, decomposition furnace, tertiary air pipe, kiln tail smoke, and kiln head cover.
When installing this product, according to the different industrial measurement and control points, you can leave a blank or protective tube on the kiln in advance, and select a special thermocouple of the corresponding specification.
In the design process of this product, we have fully considered the specifications and models installed in the running 1000 ～ 10000T / D cement production line for the use of various measurement and control points on your production line.
Selection of the length of the protective tube: insertion depth in the furnace + thickness of the furnace wall + exposed part of the furnace = total length During the production operation, when installing or replacing the thermocouple, please slowly place the thermocouple in the furnace and fix the connection device
When the long-term temperature measurement at the process measurement and control point is at 1100 ° C, the K-type thermocouple normally works for about 60 working days. Due to the long-term high temperature of the pair of wires, the accuracy will be slightly changed. Temperature measuring element.
In the places involving blanking or erosion, after the thermocouple is used for 60 working days, the thermocouple is turned over at 90 ° C and reinstalled, which doubles the life of the special wear-resistant thermocouple.
Fluidized bed main bed fluidized bed dense phase area (at the distribution plate), temperature range 0 ~ 1100 ℃, the medium contains pulverized coal, and contains a lot of H2S, SO2, NH3, CO2 strong corrosive gases generated by combustion The erosion force of the material in the chemical state is very strong. The dilute phase zone of the fluidized bed has a temperature range of 0 to 1100 ° C. The material in the fluidized state has a strong scouring force and contains corrosive gases.
The inlet and outlet of the cyclone separator and the feeder have a temperature range of 0 to 900 ° C, a high-speed air flow of about 25 to 27 m / s at the inlet, and a particulate medium, which has a strong scouring force.
Fluidized bed slag cooler, temperature range 0 ～ 800 ℃, with corrosive gas containing particles and CO, CO2, SO2, H2S etc. In view of the above measurement environment, the WRNNM series of new-generation composite thermocouples with high temperature resistance, corrosion resistance and wear resistance developed by the company greatly ensure the normal temperature measurement and service life under the above process conditions. The product is durable, safe and reliable , Long service life, good mutation performance, high thermal conductivity, oxidation resistance, thermal shock resistance, high temperature resistance, corrosion resistance, erosion resistance, no tumor, no slag, easy installation and use, can be used for temperature measurement 0 ~ 1300 The special temperature measurement occasion of ℃ is a product that can not be replaced by the existing thermocouple protection tubes made of corundum, high aluminum, graphite, silicon oxide oxide and other materials in China. It is the current temperature sensor of choice for circulating fluidized bed boilers.
2. Product features
Our company specializes in wear-resistant thermocouples for vulcanization beds. It scientifically combines a variety of high-quality materials in proportion, changes the crystal structure of mixed materials, and recasts the physical and chemical characteristics of composite steel pipes, thus adapting to B, S, K, E Various temperature thermocouples and various harsh working environments, each type of protection tube has different characteristics.
This type of product can provide Ñ„16, Ñ„20, Ñ„25, Ñ„32 and other outer diameter protection tubes, which are suitable for use in fluidized bed slag coolers and other devices.
Wear resistance hardness: (HRC) ≥60
Scour resistance: 30M / S
Corrosion resistance: CO, CO2, SO2, H2S, NH3 and other corrosive gas spray welding layer density:> 98%
Basic knot strength: ≥30Mpa
Outer casing specifications: ф18 ～ 34m / m
Insertion length: 150 ～ 1500 (mm)
Thermal response time of armored thermocouple with protective sleeve
High-temperature wear-resistant thermocouple K type wear-resistant thermocouple
(1) Special wear-resistant thermocouple for cement plant
1. Features and uses
According to the temperature measurement characteristics of the third, fourth, and fifth-stage cone temperature of the cement dry process rotary kiln production line, the temperature of the middle of the calciner, the tail gas of the kiln, and the hood of the kiln, the wear-resistant thermocouple high temperature wear-resistant thermocouple K Type wear-resistant thermocouple
Due to the problem of the material of the protective tube of the ordinary wear-resistant thermocouple, it cannot meet the special temperature measurement conditions of high temperature resistance and erosion resistance, resulting in a short service life of the thermocouple, increased conditions and expenses, frequent product replacement, and no guarantee for the transmission signal. Being in a state of vigilance for a long time, and adding a lot of work to instrument maintenance, this phenomenon is a common problem in the national cement industry.
High-temperature wear-resistant thermocouple K type wear-resistant thermocouple
2. Product features
Professionally designed and professionally developed temperature measuring instrument.
3. Main technical indicators
1. Brief description As a temperature sensor for cement special thermocouple, it is usually used in conjunction with DCS, PLC, display instrument, recording instrument and electronic regulator. It can directly measure the temperature of gas and medium in the range of three-stage cylinder, four-stage cylinder, five-stage cylinder, tertiary air pipe, decomposition furnace, kiln tail smoke chamber, kiln head cover, 600 ～ 1320 ℃
Product specific name
Index number
Measuring temperature (℃)
Allowable deviation (△ t ℃)
WRN-NM
B
0 ～ 1680
± 1.5 ℃ or (or) ± 0.25% t
S
0 ～ 1450
± 1.5 ℃ or (or) ± 0.25% t
K
0 ～ 1150
± 2.5 ℃ or (or) ± 0.75% t
E
0 ～ 780
± 2.5 ℃ or (or) ± 0.75% t
3. Thermal response time When the temperature changes stepwise, the output change value of the thermocouple is equivalent to 50% of the change. The time required is the thermal response time, expressed by T0.5.
4. The nominal pressure of the thermocouple refers to the static external pressure that the protection tube can withstand without breaking at room temperature, and the atmospheric pressure is ≥ 67MPa. In fact, the allowable working pressure is not only related to the material of the protective tube, the diameter and wall thickness, but also its structure, installation method, depth of insertion, and the flow rate and type of the measured medium.
5. Thermocouple insulation resistance (normal temperature) The test voltage of the normal temperature insulation resistance is DC 500V ± 50V, and the atmospheric conditions for measuring the normal temperature insulation resistance are temperature 15 ～ 35 ℃, relative humidity
High-temperature wear-resistant thermocouple K type wear-resistant thermocouple
6. Upper temperature insulation resistance
Upper limit temperature ℃
Test temperature t ℃
Resistance value MΩ
100≤tm ＜ 300
t = tm
10
300≤tm ＜ 500
t = tm
2
500≤tm ＜ 850
t = tm
0.5
850≤tm ＜ 1000
t = tm
0.08
1000≤tm ＜ 1300
t = tm
0.02
tm ＞ 300
T = 1300
0.02
4. Connection method
According to the needs of on-site installation, the installation methods of NM series cement special thermocouples can be divided into three types: threaded interface, movable flange and fixed flange. The user can determine the installation interface method according to the on-site process conditions, and pay attention to the temperature and fluid velocity of each measurement and control point on the company's production line as much as possible, and then determine the wall thickness of the special protective tube.
V. Product media description
1. Strength:
material type
New SiC
3151 chrome steel protection tube
Material
SiC
315H
density
3.06
1.367
Porosity
Dense
0.09
Withstand voltage
12Mpa
8 Mpa
strength
290
219
Normal temperature
1.7
1100 ℃
Specific heat
1470 ℃
0.6
Thermal response time
<70 seconds
<90 seconds
Resistivity
0.1
0.1
Antioxidant
excellent
…
Creep performance
excellent
…
Thermal shock resistance
excellent
…
Maximum operating temperature ℃
1470 ℃
1300 ℃
Flexural strength
450N / mm
500 N / mm
Product specification
φ20-φ45
φ20-φ30
6. Instructions
The NM series alloy steel wear-resistant thermocouple is mainly composed of a junction box, a junction tube, a special protection tube, an insulating sleeve, a terminal, a special lining sleeve, and a hot electrode, and is equipped with various installation components. The integrated temperature transmitter can be selected at the same time.
7. Application Examples
Taking 2500T / D production as an example, the special thermocouple is suitable for measurement and control occasions and its insertion depth and its corresponding temperature are as follows:
Device Tag
use
specification
diameter
Process temperature
TE-01
A cone temperature of the third stage
L × 1 = 900 * 750
φ20
φ22
φ25
650-700 ℃
TE-02
Three-stage barrel B cone temperature
L × 1 = 900 * 750
φ20
φ22
φ25
650-700 ℃
TE-03
Four-stage barrel A cone temperature
L × 1 = 1000 * 750
φ20
φ22
φ25
750-800 ℃
TE-04
Four-stage barrel B cone temperature
L × 1 = 1000 * 850
φ20
φ22
φ25
750-800 ℃
TE-05
Five cone A cone temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
850-900 ℃
TE-06
Five cone B cone temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
850-900 ℃
TE-07
Decomposition furnace A outlet temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
1000-1100 ℃
TE-08
Calciner B outlet temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
1000-1100 ℃
TE-09
Tertiary duct outlet temperature
L × 1 = 900 * 750
φ22
φ25
φ32
850-950 ℃
TE-10
Kiln tail chamber temperature
L × 1 = 1050 * 900
φ22
φ25
φ32
1050-1000 ℃
TE-11
Kiln hood temperature
L × 1 = 850 * 700
φ22
φ25
φ32
900-950 ℃
8. Order Notice
Device Tag
use
specification
diameter
Process temperature
TE-01
A cone temperature of the third stage
L × 1 = 900 * 750
φ20
φ22
φ25
650-700 ℃
TE-02
Three-stage barrel B cone temperature
L × 1 = 900 * 750
φ20
φ22
φ25
650-700 ℃
TE-03
Four-stage barrel A cone temperature
L × 1 = 1000 * 750
φ20
φ22
φ25
750-800 ℃
TE-04
Four-stage barrel B cone temperature
L × 1 = 1000 * 850
φ20
φ22
φ25
750-800 ℃
TE-05
Five cone A cone temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
850-900 ℃
TE-06
Five cone B cone temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
850-900 ℃
TE-07
Decomposition furnace A outlet temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
1000-1100 ℃
TE-08
Calciner B outlet temperature
L × 1 = 1050 * 900
φ20
φ22
φ25
1000-1100 ℃
TE-09
Tertiary duct outlet temperature
L × 1 = 900 * 750
φ22
φ25
φ32
850-950 ℃
TE-10
Kiln tail chamber temperature
L × 1 = 1050 * 900
φ22
φ25
φ32
1050-1000 ℃
TE-11
Kiln hood temperature
L × 1 = 850 * 700
φ22
φ25
φ32
900-950 ℃
(2) Special wear-resistant thermocouple for circulating fluidized Bed
With the popularization of circulating fluidized bed (CFB) boilers in China's power industry, it is imperative to use ideal thermocouples with high temperature resistance, corrosion resistance and wear resistance to monitor the furnace temperature. The main control points of circulating fluidized bed boiler temperature measurement are:
With the development of the power industry, the monitoring of furnace temperature in circulating fluidized bed boilers has been paid more and more attention. Our company has successfully modified the existing wear-resistant thermocouple protection tubes to solve the non-wearing and creep temperature of stainless steel tubes. Low; ceramic tubes have poor thermal shock resistance and low strength; ordinary alloy steel tubes are not resistant to acid and alkali corrosion and other difficult problems in temperature measurement.
3. Main technical indicators
Temperature measurement range: 0 ～ 1300 ℃
Protection tube diameter mm
ф18 × 3
ф20 × 3
Ñ„22
Ñ„25
Ñ„30
Thermal response time (r0.5) (s)
≤20
≤30
≤45
≤45
≤60
High-temperature wear-resistant thermocouple K type wear-resistant thermocouple