CN216744301U - Novel boiler heated pipe wall temperature measuring system - Google Patents
Novel boiler heated pipe wall temperature measuring system Download PDFInfo
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- CN216744301U CN216744301U CN202220213577.0U CN202220213577U CN216744301U CN 216744301 U CN216744301 U CN 216744301U CN 202220213577 U CN202220213577 U CN 202220213577U CN 216744301 U CN216744301 U CN 216744301U
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Abstract
The utility model relates to a novel system for measuring the wall temperature of a heated tube of a boiler, which comprises a heat collecting block, a thermocouple lead wire and a U-shaped hoop; the thermocouple is welded inside the heat collection block, the heat collection block is welded and fixed with the outer wall surface of the heated tube through a groove, and the thermocouple lead is fixed on the outer wall surface of the heated tube through a U-shaped hoop; the heat collecting block is made of the same metal material as the heated pipe; the left side and the right side of the back surface of the heat collection block are provided with grooves of 45-60 degrees, and the grooves are welded and fixed with the heated pipe through welding blocks; the heat collection block is internally provided with a small through hole, and a thermocouple is inserted into the small hole. The utility model has the beneficial effects that: because the heat collection block and the heated tube are fixed by welding, the thermal resistance between the thermocouple and the heated tube is very small, and because the outer surface of the heat collection block is coated with the zirconia coating, the thermal resistance between the thermocouple and the high-temperature flue gas is larger, and the high-temperature flue gas is prevented from being directly washed away, so that the thermocouple can accurately reflect the metal temperature of the heated tube, and the measurement accuracy is high.
Description
Technical Field
The utility model relates to the technical field of temperature measurement, in particular to a device capable of monitoring the temperature of a heated pipe wall in a high-temperature furnace.
Background
The boiler is an important energy conversion and utilization device for industrial production, and in order to obtain high-temperature and high-pressure steam for driving a steam turbine to do work, a large number of heating surfaces including a platen superheater, a high-temperature superheater, a reheater and the like need to be arranged in a hearth. These heating surfaces are usually composed of round tubes, in which high-temperature and high-pressure steam is present, and outside which high-temperature flue gas at about 1000 ℃ is present. Due to the severe working conditions of the heated tubes, the tubes are usually operated near the critical value of the metal deformation temperature, and the tube explosion accidents of the boiler often occur. Therefore, the wall surface temperature of the heated pipe of the power station boiler is monitored and measured, and the operation safety of the boiler can be effectively improved.
Because the temperature of the heated tube and the external flue gas is very high, the temperature measurement of the heated tube wall in the furnace is not easy, and a thermocouple sheath of a conventional temperature measuring device such as a thermocouple or a thermocouple group is made of common stainless steel materials such as 316L and the like, so that the temperature measuring element is easy to oxidize and break at high temperature, and the temperature measuring element is damaged. At present, in some power plants, a thermocouple is mainly arranged near a small chamber close to a furnace top, the position of the thermocouple is protected by cooling of the small chamber at the furnace top, the service life of the thermocouple is greatly prolonged, but a measuring point cannot go deep into a hearth, and the actual temperature of the wall of the furnace under the condition that flue gas in the furnace erodes and exchanges heat cannot be reflected.
In summary, in order to ensure the safe operation of the boiler and prevent the tube explosion of the heating surface, it is necessary to develop a long-term effective monitoring method for the wall temperature of the heating tube in the boiler.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide a novel system for measuring the wall temperature of a heated pipe of a boiler.
The novel system for measuring the wall temperature of the heated tube of the boiler comprises a heat collecting block, a thermocouple lead wire and a U-shaped hoop; the thermocouple is welded inside the heat collection block, the heat collection block is welded and fixed with the outer wall surface of the heated tube through the groove, and the thermocouple lead is fixed on the outer wall surface of the heated tube through the U-shaped hoop.
Preferably, the method comprises the following steps: the heat collecting block is made of the same metal material as the heated pipe.
Preferably, the method comprises the following steps: the left side and the right side of the back surface of the heat collection block are provided with grooves of 45-60 degrees, and the grooves are welded and fixed with the heated pipe through the welding block.
Preferably, the method comprises the following steps: the heat collection block is internally provided with a small through hole, and a thermocouple is inserted into the small hole.
Preferably, the method comprises the following steps: the heat collecting block is in an arc structure attached to the outer wall surface of the heated tube.
Preferably, the method comprises the following steps: the end part of the thermocouple is welded and fixed with the lower end of the heat collection block through a welding block.
Preferably, the method comprises the following steps: the thermocouple sheath is made of heat-resistant steel, the working end of the thermocouple moves upwards, and magnesium oxide is filled at the bottom of the thermocouple sheath.
Preferably, the method comprises the following steps: the outer surface of the heat collection block is coated with a zirconia coating with the thickness of 0.1mm-0.3 mm.
Preferably, the method comprises the following steps: the thermocouple lead is fixed on the back of the heated tube through a U-shaped hoop made of heat-resistant stainless steel.
The utility model has the beneficial effects that:
1. because the heat collection block and the heated tube are fixed by welding, the thermal resistance between the thermocouple and the heated tube is very small, and because the outer surface of the heat collection block is coated with the zirconia coating, the thermal resistance between the thermocouple and the high-temperature flue gas is larger, and the high-temperature flue gas is prevented from being directly washed away, so that the thermocouple can accurately reflect the metal temperature of the heated tube, and the measurement accuracy is high.
2. The thermocouple sheath is made of heat-resistant steel, can stably work at 1000 ℃ for a long time, and the heat collection block is made of the same material as a heat exchange tube of the boiler, so that dissimilar steel welding is avoided, and the thermocouple sheath is simple to weld, safe, reliable and low in cost.
Drawings
FIG. 1 is a schematic structural diagram of a novel boiler heated pipe wall temperature measurement system according to the present invention;
fig. 2 is a schematic structural view of the thermocouple and the heat collecting block of fig. 1.
Description of reference numerals: 1-a heated tube; 2-U-shaped hoop; 3-thermocouple lead; 4-heat collecting block; 5-welding blocks; 6-magnesium oxide; 7-thermocouple.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the utility model. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
The embodiment of the application provides a novel boiler heating pipe wall temperature measuring system, which comprises a heat collecting block 4, a thermocouple 7, a thermocouple lead wire 3 and a U-shaped hoop 2. The thermocouple 7 is welded inside the heat collection block 4, the heat collection block 4 is welded and fixed with the outer wall surface of the heated tube 1 through a groove, and the thermocouple lead 3 is fixed on the outer wall surface of the heated tube 1 through the U-shaped hoop 2.
The heat collecting block 4 is made of the same metal material as the heated pipe 1; the left side and the right side of the back surface of the heat collection block 4 are provided with grooves of 45-60 degrees, and the grooves are welded and fixed with the heated tube 1 through welding blocks 5 made of corresponding materials; a small through hole is formed in the heat collection block 4, and a thermocouple 7 is inserted into the small hole; the heat collecting block 4 is in an arc structure attached to the outer wall surface of the heated pipe 1.
The end part of the thermocouple 7 is welded and fixed with the lower end of the heat collecting block 4 through the welding block 5, and the thermocouple is prevented from being separated due to thermal expansion during measurement.
The thermocouple sheath is made of high-temperature-resistant TP310 heat-resistant steel, the working end of the thermocouple moves upwards, and magnesium oxide 6 is filled at the bottom of the thermocouple sheath to prevent the end part of the thermocouple from being damaged when being welded with the heat collecting block 4, so that the thermocouple can stably work for a long time at 1000 ℃.
The outer surface of the heat collection block 4 is coated with a zirconia coating with the thickness of 0.1mm-0.3mm for heat insulation.
The thermocouple lead 3 winds to the back of the heated tube 1, and the thermocouple lead 3 is tightly attached and fixed to the heated tube 1 through the U-shaped hoop 2 made of heat-resistant stainless steel, so that the thermocouple lead is prevented from being burnt by high-temperature flue gas.
Example two
The second embodiment of the application provides a novel installation method of a boiler heated pipe wall temperature measurement system, which comprises the following steps:
s1, inserting the thermocouple 7 into the small hole of the heat collection block 4, and welding and fixing the thermocouple at the bottom of the heat collection block 4, thereby ensuring that the contact thermal resistance between the thermocouple and the heated tube is reduced to the lowest, and preventing the thermocouple from being separated from the heat collection block due to thermal expansion.
And S2, welding and fixing the heat collecting block 4 and the heated pipe 1 through a groove.
S3, coating a layer of zirconia coating on the outer surface of the heat collection block 4, so that the convection, heat conduction and radiation influence of high-temperature flue gas on the heated tube 1 is reduced, and the thermocouple 7 is very close to the wall temperature of the heated tube 1.
S4, fixing the thermocouple lead 3 on the outer wall of the heated tube 1 through the U-shaped hoop 2, and fixing the thermocouple lead outside the heated tube by bypassing the flow direction of high-temperature flue gas, so that the thermocouple lead is ensured to be in a safe temperature range, the thermocouple lead can be operated reliably for a long time, and the continuous and accurate monitoring of the wall temperature of the heated tube in the furnace is realized.
Claims (9)
1. The utility model provides a novel boiler heated tube wall temperature measurement system which characterized in that: the device comprises a heat collecting block (4), a thermocouple (7), a thermocouple lead wire (3) and a U-shaped hoop (2); the thermocouple (7) is welded inside the heat collection block (4), the heat collection block (4) and the outer wall surface of the heated tube (1) are welded and fixed through a groove, and the thermocouple lead (3) is fixed on the outer wall surface of the heated tube (1) through the U-shaped hoop (2).
2. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: the heat collecting block (4) is made of the same metal material as the heated pipe (1).
3. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: the left side and the right side of the back surface of the heat collection block (4) are provided with grooves of 45-60 degrees, and the grooves are welded and fixed with the heated tube (1) through welding blocks (5).
4. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: a small through hole is arranged in the heat collection block (4), and a thermocouple (7) is inserted into the small hole.
5. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: the heat collecting block (4) is of an arc structure which is attached to the outer wall surface of the heated tube (1).
6. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: the end part of the thermocouple (7) is welded and fixed with the lower end of the heat collection block (4) through a welding block (5).
7. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: the thermocouple sheath is made of heat-resistant steel, the working end of the thermocouple moves upwards, and the bottom of the thermocouple sheath is filled with magnesium oxide (6).
8. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: the outer surface of the heat collection block (4) is coated with a layer of zirconia coating with the thickness of 0.1mm-0.3 mm.
9. The novel boiler heating tube wall temperature measuring system according to claim 1, characterized in that: the thermocouple lead (3) is fixed on the back of the heated tube (1) through a U-shaped hoop (2) made of heat-resistant stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220213577.0U CN216744301U (en) | 2022-01-26 | 2022-01-26 | Novel boiler heated pipe wall temperature measuring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220213577.0U CN216744301U (en) | 2022-01-26 | 2022-01-26 | Novel boiler heated pipe wall temperature measuring system |
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| CN216744301U true CN216744301U (en) | 2022-06-14 |
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| CN202220213577.0U Active CN216744301U (en) | 2022-01-26 | 2022-01-26 | Novel boiler heated pipe wall temperature measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114353046A (en) * | 2022-01-26 | 2022-04-15 | 浙江浙能技术研究院有限公司 | Novel boiler heated pipe wall temperature measuring system and method |
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- 2022-01-26 CN CN202220213577.0U patent/CN216744301U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114353046A (en) * | 2022-01-26 | 2022-04-15 | 浙江浙能技术研究院有限公司 | Novel boiler heated pipe wall temperature measuring system and method |
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