CN115717944A - Direct temperature measuring type COT surface thermocouple - Google Patents
Direct temperature measuring type COT surface thermocouple Download PDFInfo
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- CN115717944A CN115717944A CN202211470090.1A CN202211470090A CN115717944A CN 115717944 A CN115717944 A CN 115717944A CN 202211470090 A CN202211470090 A CN 202211470090A CN 115717944 A CN115717944 A CN 115717944A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/04—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a direct temperature measurement type COT surface thermocouple, which relates to the technical field of chemical process equipment and comprises a contact type temperature measurement component and a temperature measurement element, wherein the direct temperature measurement type COT surface thermocouple is used for being installed on the surface of an object to be measured in temperature, the contact type temperature measurement component is completely in contact welding with the surface of the object to be measured in temperature, and the whole contact type temperature measurement component forms an inclined angle relative to the surface of the object to be measured in temperature; the temperature measuring element passes through the inner hole inclined plane of the contact type temperature measuring component, so that a measuring point at the end part of the temperature measuring element is in close contact with the surface of the object to be measured, and the cold end of the temperature measuring element can be connected with the junction box. After the temperature measuring element is installed, a measuring point can be tightly jointed with the surface of an object to be measured so as to ensure the instant reaction and the accurate measurement of the temperature.
Description
The application is a divisional application of an invention patent with a parent name of 'COT surface thermocouple'; the parent application has the application number: 202011434316.3; the application date of the parent application is as follows: 2020.12.10.
Technical Field
The invention relates to the field of chemical process equipment, is suitable for an ethylene cracking furnace, and particularly relates to a direct temperature measurement type COT surface thermocouple.
Background
The outlet temperature (COT) of the ethylene cracking furnace represents the cracking depth of the raw material, directly concerns the ethylene yield and is an important control index in operation. In the advanced control and the classical control of the cracking furnace, the core is developed around the temperature of the furnace outlet, the COT temperature is reasonably set by detecting the components of cracking gas at the outlet of the cracking furnace and combining the properties of raw materials, the constant temperature of the outlet of each group of furnace tubes is ensured by adjusting the proportion of feeding and diluting steam, and the temperature deviation of each group of furnace tubes is ensured to meet the requirement, so that the cracking depth is ensured. Therefore, the COT measurement is extremely important, and the accuracy of the temperature control of the outlet of the cracking furnace directly influences the long-period stable operation of the cracking furnace.
From the practical operation, the smaller the temperature difference between the furnace outlet temperatures of each group of the cracking furnace is, the more uniform the control is, and the longer the operation period of the cracking furnace is. Conversely, if the COT measurement has deviation, the feeding of each group of furnace tubes of the cracking furnace is uneven, which causes different coking degrees of each group of furnace tubes, and the furnace tubes are leaked, blocked, cracked and reduced in service life in severe cases, and also causes unplanned furnace shutdown, thereby having great influence on equipment and economic benefits.
If the temperature at the outlet of the cracking furnace is too low, the cracking depth is insufficient, heavy components are excessive, and the ethylene yield is influenced; if the temperature is too high, the reverse reaction is increased, the coking speed of the furnace tube is increased, the yield is influenced, the operation period of equipment is shortened, and production accidents can be caused.
In conclusion, the accuracy of the temperature measurement at the outlet of the cracking furnace directly affects the economic operation of the cracking furnace.
In the prior art, as shown in fig. 1-3, in an indirect temperature measurement type COT surface thermocouple, a temperature measurement end of a sleeve is welded to the surface of a furnace tube, an included angle is formed between the upper bending and the furnace tube, and the sleeve may be bent for many times under the requirement of an installation space. The temperature measuring element (thermocouple wire) is deformed through the bent part of the sleeve in the installation process, so that the installation is very difficult. After the temperature measuring device is installed and operated, the temperature measuring element is influenced by temperature to deform, the temperature measuring element (thermocouple wire) is more difficult to pull out during maintenance and replacement, the more critical point is that the thermocouple wire passes through a bent part of the sleeve, a measuring point part is inclined and deformed towards the outer side of the sleeve, the inner side of the sleeve is welded with the furnace tube and is used for sensing temperature, and the outer side of the sleeve is used for conducting temperature. The measuring point is in contact with the conduction temperature, and has a deviation from the actual temperature.
In summary, the prior art has the following two defects: 1. the temperature change on the surface of the furnace tube can not be immediately reflected, and the deviation between the measured and displayed temperature and the actual temperature is larger. 2. Because the sleeve pipe is bent, the thermocouple is difficult to install, the thermocouple sleeve pipe needs to be replaced if the thermocouple core cannot be drawn out during detection and replacement, and the heat insulation layer needs to be removed when the thermocouple sleeve pipe is replaced. Not only wastes resources, but also increases the overhaul cost and the equipment operation cost.
Disclosure of Invention
The invention aims to provide a direct temperature measurement type COT surface thermocouple, which is mainly developed and designed aiming at the defects which are not overcome in the prior art, so that a measuring point after a temperature measuring element is installed can be tightly jointed with the surface of an object to be measured, and the instant reaction and the accurate measurement of the temperature are ensured.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a direct temperature measurement type COT surface thermocouple, which comprises a contact type temperature measurement component and a temperature measurement element, wherein the direct temperature measurement type COT surface thermocouple is used for being installed on the surface of an object to be measured, the contact type temperature measurement component is completely in contact welding with the surface of the object to be measured, and the whole contact type temperature measurement component forms an inclined angle relative to the surface of the object to be measured; the temperature measuring element passes through the inner hole inclined plane of the contact type temperature measuring component, so that a measuring point at the end part of the temperature measuring element is in close contact with the surface of the object to be measured, and the cold end of the temperature measuring element can be connected with the junction box.
Preferably, the object to be subjected to temperature measurement is a furnace tube, and the welding surface of the contact temperature measurement component is designed and processed into different curved surfaces according to different outer diameters of the furnace tube and a given installation space, so that the contact temperature measurement component is completely fitted with the surface of the furnace tube;
the whole contact type temperature measuring component presents an inclination angle up and down or left and right.
Preferably, the direct temperature measurement type COT surface thermocouple further comprises a sleeve, one end of the sleeve is concentrically connected with the contact type temperature measurement component without bending, and the connection mode is concentric welding counter bores or threaded connection; the other end of the sleeve is provided with a clamping sleeve component, the temperature measuring element is arranged in the sleeve and is detachably connected with the clamping sleeve component, and the cold end of the temperature measuring element is connected with the junction box through the sleeve.
Preferably, the sleeve is formed by splicing two sections, and the two sections of sleeves are connected through a connecting sealing assembly to form a sealing cavity.
Preferably, the contact temperature measuring component and the first section of sleeve are wrapped in the heat insulation layer along with the furnace tube, and the first section of sleeve is exposed out of the heat insulation layer by 50mm.
Preferably, the ferrule assembly is a ferrule bolted connection seal structure.
Preferably, the contact temperature measuring component is made of stainless steel bar stock, hexagonal stock or square stock, and is designed and finished according to the diameter of the furnace tube and the given installation space.
Preferably, the junction box conforms to the national standards of protection and explosion prevention, 1/2 NPT and 3/4 NPT are used as electrical interfaces, and a wiring terminal base is arranged in the junction box.
Preferably, the lower end of the contact type temperature measurement component is provided with a pressure relief and cleaning cavity structure for overpressure relief and inner cavity cleaning.
Preferably, the pressure-release clear cavity structure is in threaded connection with the contact temperature measurement component, when the direct temperature measurement type COT surface thermocouple works, pressure can be released through the pressure-release clear cavity structure when the internal pressure is increased, the pressure-release clear cavity structure can be taken down during maintenance, the interior of the sleeve is purged, and dust in the sleeve is discharged.
Compared with the prior art, the invention has the following technical effects:
according to the direct temperature measurement type COT surface thermocouple, the contact temperature measurement component is in complete contact welding with the surface of the object to be measured, and the contact temperature measurement component and the surface of the object to be measured can form any included angle, so that the situation that the thermocouple cannot be installed due to the fact that the included angle is too large is avoided; the temperature measuring element can be in close contact with the surface of an object to be measured through the inner hole inclined plane of the contact temperature measuring component, so that the temperature measuring element is short in thermal response time, high in precision and more accurate in temperature measurement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of a COT surface thermocouple of the prior art;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
FIG. 3 is an enlarged schematic view of B in FIG. 1;
FIG. 4 is a schematic view of the overall structure of a direct temperature measurement type COT surface thermocouple of the present invention;
FIG. 5 is an enlarged view of the point A in FIG. 4;
FIG. 6 is an enlarged view of the point B in FIG. 4;
FIG. 7 is a schematic structural view of a contact temperature measurement component according to the present invention;
FIG. 8 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 7;
FIG. 9 is a comparison graph of the positions of the measuring points of the direct temperature measurement type COT surface thermocouple of the present invention and the prior art;
FIG. 10 is a schematic view of the contact type temperature measuring part of the present invention installed obliquely;
FIG. 11 is a schematic view of different curved surfaces of the lower end of the contact temperature measurement component according to the present invention;
reference numbers in fig. 4-11 illustrate: 1. the temperature measuring device comprises a temperature measuring element 2, a connecting sealing assembly 3, a clamping sleeve assembly 31, a sealing double-clamping sleeve 4, a sleeve 5, a contact type temperature measuring part 6, a COT furnace tube 61, a COT furnace tube surface 7, a measuring point 8 and a junction box.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
The invention aims to provide a direct temperature measurement type COT surface thermocouple, which is designed mainly aiming at the defects which are not overcome in the prior art, so that a measuring point after a temperature measuring element is installed can be tightly jointed with the surface of an object to be measured, and the instant reaction and the accurate measurement of the temperature are ensured.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
In this embodiment, the ethylene cracking furnace tube is taken as the object to be measured, but it should be clear that the direct temperature measurement type COT surface thermocouple of this embodiment is not limited to the measurement of the surface temperature of the ethylene cracking furnace tube, and is suitable for the measurement of the surface temperature of all heating furnace tubes and related objects.
As shown in fig. 4-11, the direct temperature measurement COT surface thermocouple of the present embodiment includes: the junction box 8 and the COT furnace tube 6 further comprise a temperature measuring element 1 (preferably a thermocouple wire), a connecting seal assembly 2, a ferrule assembly 3, a sleeve 4 and a contact temperature measuring part 5, wherein the direct temperature measuring type COT surface thermocouple is installed on the outer side of the surface 61 of the COT furnace tube 6, referring to the schematic overall structure diagram of the direct temperature measuring type COT surface thermocouple in the embodiment shown in the attached drawing 5, in general, the outer portion of the COT furnace tube 6 is wrapped with a heat insulating layer, one end of the contact temperature measuring part 5 is welded on the surface 61 of the COT furnace tube, the whole body is inclined relative to the surface 61 of the COT furnace tube, the inclined angle is 0-60 degrees, and after the sleeve 4 is inclined along with the contact temperature measuring part 5, the ferrule assembly 3 is required to be exposed outside the heat insulating layer, and online disassembly and replacement of the temperature measuring element 1 can be realized.
The sleeve pipe 4 is connected on contact temperature measurement part 5, and the sleeve pipe 4 divide into two sections concatenations and forms, for avoiding the whole overlength of sleeve pipe 4 and be not convenient for with the welding of contact temperature measurement part 5, the concatenation department uses and connects sealing component 2 to connect, connects sealing component 2 and plays the effect of connecting two sections fixed sleeve pipes 4, through threaded connection between two sections sleeve pipes 4, the screw thread is the NPT toper sealing thread to use and connect sealing component 2 fastening. One end of the sleeve 4 is welded or in threaded connection with the contact temperature measuring part 5, the other end of the sleeve is provided with a clamping sleeve component 3, and the upper end of the clamping sleeve component 3 is connected with a junction box 8.
In this embodiment, fig. 5 and fig. 6 also show a detailed view of a welding end of the contact temperature measurement component 5 and the COT tube 6 and a detailed view of the ferrule assembly 3, with further reference to fig. 4, a welding surface of the contact temperature measurement component 5 is processed into a curved surface according to an outer diameter of the COT tube 6, so that the contact temperature measurement component 5 is attached to a surface 61 of the COT tube, the other end of the contact temperature measurement component 5 is provided with a concentric counterbore matched with the sleeve 4, the sleeve 4 is connected to the contact temperature measurement component 5, the two are provided with concentric inner holes, the bore diameter of the concentric counterbore is matched with the outer diameter of the sleeve 4, the bore depth is 7 to 10mm, the concentric inner holes are through holes, the bore diameter is 10mm, the temperature measurement element 1 penetrates through the concentric inner holes, the measurement point 7 is in close contact with an outer side of the surface 61 of the COT tube, wherein the measurement point 7 is also called a temperature measurement end.
As shown in figure 9, the direct temperature measurement type COT surface thermocouple measuring point position of the invention is compared with the prior art, the temperature measuring element 1 sequentially passes through the clamping sleeve component 3, the upper sleeve and the lower sleeve, and finally enters the contact type temperature measuring part 5, the temperature measuring element 1 is adjusted to ensure that the temperature measuring element is inserted to the bottom and is tightly contacted with the surface 61 of the COT furnace tube, and then the sealing double clamping sleeves 31 are screwed, fixed and sealed. The contact position of the temperature measuring element 1 and the COT furnace tube surface 61 is a measuring point 7, the diameter of the thermocouple wire can be selected according to the actual working condition, and the thermocouple wire is selected in the embodiment
Thermocouple wires of a diameter are used as the temperature measuring element 1. Compared with the prior art, the prior art is indirect temperature measurement, the temperature measurement element 1 deforms at the bent part of the sleeve and inclines towards the outer side of the sleeve, the measurement point contacts with the outer side surface of the sleeve, the temperature change cannot be reflected immediately, and the measurement error is large. The direct temperature measurement type COT surface thermocouple of the scheme is direct temperature measurement, is convenient to install and maintain, can be replaced on line, and is long in service life. According to the direct temperature measurement type COT surface thermocouple, the contact surface of the contact type temperature measurement component 5 and the surface 61 of the COT furnace tube is a curved surface, so that the welding is convenient, and the strength is higher after the welding; the contact type temperature measuring component 5 and the COT furnace tube surface 61 can present any included angle in an unlimited form according to the requirement, and the temperature measuring element 1 cannot be installed due to the fact that the included angle is too large; the measuring point 7 is directly and tightly contacted with the surface 61 of the COT furnace tube, so that the thermal response time is short, the measuring precision is high, and the temperature is more accurately measured; the contact temperature measuring component 5 is directly welded on the COT furnace tube 6, so that the sleeve 4 is prevented from bending, and the temperature measuring element 1 is greatly convenient to install.
Furthermore, in the embodiment, the whole contact temperature measuring component 5 is inclined relative to the surface 61 of the COT furnace tube, and the temperature measuring element 1 can be obliquely inserted into the heat preservation layer, so that most of the temperature measuring element 1 is positioned in the heat preservation layer, thereby reducing heat loss around the temperature measuring element 1 and further ensuring the temperature measuring precision; moreover, the temperature measuring end of the temperature measuring element 1 is obliquely contacted with the surface 61 of the COT furnace tube, so that the contact area can be increased, and the measuring effect is further improved.
FIG. 10 is a schematic view of an oblique installation of a contact temperature measurement member according to the present invention, and FIG. 11 is a schematic view of different curved surfaces of a lower end of the contact temperature measurement member according to the present invention; the inclination of the contact temperature measuring component 5 is variable, and the contact temperature measuring component 5 and the furnace tube are connected in different forms in the radial direction and the axial direction according to the diameter, the structural form and the installation space of the furnace tube, so that the installation is realized under the condition that the sleeve is not bent, and the integral installation requirement of the process equipment is met; the design of different curved surfaces at the lower end of the contact temperature measuring component is designed according to the inclination angle of the contact temperature measuring component and the furnace tube, and the curved surfaces are matched with the outer wall of the furnace tube to ensure the tight fit.
It should be noted that the cutting ferrule assembly 3 is a cutting ferrule bolt structure, and a sealed double cutting ferrule 31 is arranged in the cutting ferrule assembly, and mainly plays a role in sealing connection and fixation, and when the temperature measuring element 1 needs to be replaced on line, the cutting ferrule is directly unscrewed to draw out and replace the temperature measuring element 1. Contact temperature measurement part 5 chooses stainless steel bar for use, and sleeve pipe 4 uses stainless steel pipe, should accord with the operating condition demand in the aspect of material, nominal diameter, wall thickness grade. The junction box 8 is a conventional product and is in accordance with national standards of protection and explosion prevention, 1/2 NPT and 3/4 NPT are used as electrical interfaces, and a junction terminal base is arranged in the junction box 8.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (8)
1. A direct temperature measurement type COT surface thermocouple comprises a contact temperature measurement component and a temperature measurement element, and is characterized in that the direct temperature measurement type COT surface thermocouple is arranged on the surface of an object to be measured, the contact temperature measurement component is completely in contact welding with the surface of the object to be measured, and the whole contact temperature measurement component forms an inclined angle relative to the surface of the object to be measured; the temperature measuring element passes through the inner hole inclined plane of the contact type temperature measuring component, so that a measuring point at the end part of the temperature measuring element is in close contact with the surface of the object to be measured, and the cold end of the temperature measuring element can be connected with a junction box.
2. The direct temperature measurement type COT surface thermocouple according to claim 1, wherein the object to be measured is a furnace tube, and the welding surface of the contact temperature measurement component is processed into different curved surfaces according to different outer diameters of the furnace tube and a given installation space design, so that the welding surface of the contact temperature measurement component is completely fitted with the surface of the furnace tube;
the whole contact type temperature measuring component has an inclination angle from top to bottom or from left to right.
3. The direct temperature measurement COT surface thermocouple of claim 2, wherein the direct temperature measurement COT surface thermocouple further comprises a sleeve, one end of the sleeve is concentrically connected with the contact temperature measurement component without bending, and the connection mode is concentric welding counter bores or threaded connection; the other end of the sleeve is provided with a clamping sleeve assembly, the temperature measuring element is arranged in the sleeve and is detachably connected with the clamping sleeve assembly, and the cold end of the temperature measuring element is connected with the junction box through the sleeve.
4. The direct temperature measurement COT surface thermocouple of claim 3, wherein the sleeve is formed by splicing two sections, and the two sections of the sleeve are connected through a connecting seal assembly to form a sealed cavity.
5. The direct temperature measurement COT surface thermocouple of claim 4, wherein the contact temperature measurement component and the first section of the sleeve are wrapped in an insulation layer along with the furnace tube, and the first section of the sleeve is exposed out of the insulation layer by 50mm.
6. The direct temperature measurement COT surface thermocouple according to claim 3, wherein the ferrule assembly is a ferrule bolted seal structure.
7. The direct temperature measurement COT surface thermocouple according to claim 2, wherein the contact temperature measurement component is made of stainless steel bar stock, hex stock or quad stock, and is designed and finished according to the diameter of the furnace tube and the given installation space.
8. The direct temperature measurement type COT surface thermocouple according to claim 1, wherein the junction box conforms to national standards of protection and explosion prevention, 1/2 'NPT and 3/4' NPT are used as electrical interfaces, and a wiring terminal base is arranged in the junction box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211470090.1A CN115717944A (en) | 2020-12-10 | 2020-12-10 | Direct temperature measuring type COT surface thermocouple |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011434316.3A CN112629693A (en) | 2020-12-10 | 2020-12-10 | COT surface thermocouple |
| CN202211470090.1A CN115717944A (en) | 2020-12-10 | 2020-12-10 | Direct temperature measuring type COT surface thermocouple |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011434316.3A Division CN112629693A (en) | 2020-12-10 | 2020-12-10 | COT surface thermocouple |
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| CN115717944A true CN115717944A (en) | 2023-02-28 |
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| CN202211470090.1A Pending CN115717944A (en) | 2020-12-10 | 2020-12-10 | Direct temperature measuring type COT surface thermocouple |
| CN202011434316.3A Pending CN112629693A (en) | 2020-12-10 | 2020-12-10 | COT surface thermocouple |
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| CN113739942A (en) * | 2021-10-11 | 2021-12-03 | 佛山市顺德区美的洗涤电器制造有限公司 | Supporting structure and temperature measuring device |
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| CN109459153B (en) * | 2018-11-02 | 2020-11-17 | 吴方立 | Cracking furnace COT thermocouple and protective sleeve thereof |
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2020
- 2020-12-10 CN CN202211470090.1A patent/CN115717944A/en active Pending
- 2020-12-10 CN CN202011434316.3A patent/CN112629693A/en active Pending
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| CN112629693A (en) | 2021-04-09 |
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