CN219083799U - Temperature measuring device for top of high-temperature high-pressure spherical kiln - Google Patents
Temperature measuring device for top of high-temperature high-pressure spherical kiln Download PDFInfo
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- CN219083799U CN219083799U CN202223526577.5U CN202223526577U CN219083799U CN 219083799 U CN219083799 U CN 219083799U CN 202223526577 U CN202223526577 U CN 202223526577U CN 219083799 U CN219083799 U CN 219083799U
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Abstract
The utility model relates to a temperature measuring device at the top of a high-temperature high-pressure spherical kiln, belonging to the field of temperature measurement. The utility model provides a technical scheme that the temperature measuring device at the top of a high-temperature high-pressure spherical kiln comprises an instrument source brick, an instrument protection tube with a flange and a special thermocouple, and is characterized in that the instrument source brick is a bottle plug-shaped semicircle cone, and the center of the cross section of the instrument source brick is provided with coaxial preformed holes with different diameters from top to bottom; the source brick is positioned in the innermost process brick at the center of the top of the kiln, the instrument protection pipe is inserted into the diameter-changing position of the preformed hole of the source brick and welded on the shell at the center of the top of the kiln, and the thermocouple is inserted into the flanged instrument protection pipe and extends into the interior of the kiln. The device overcomes the damage to the temperature measuring instrument caused by displacement and expansion force generated by heat expansion and cold contraction of the process wall bricks, and provides a safe detection environment; the temperature measuring device has the advantages of reasonable structure, safety, reliability, prolonged service life of the temperature measuring instrument and the like, and is an improvement and innovation for measuring the temperature at the top of the high-temperature high-pressure spherical furnace kiln.
Description
Technical Field
The utility model relates to a temperature measuring device at the top of a high-temperature high-pressure spherical kiln, belonging to the field of temperature measurement.
Background
The top combustion type hot blast stove or the external combustion type hot blast stove, the heat accumulating stove, the transduction converter and the like which are matched with blast furnace ironmaking have a common point that: high internal temperature and high pressure; a plurality of layers of bricks made of different materials are built in the steel shell to prevent heat loss, and the internal high-temperature environment is insulated and isolated from the outside through the bricks; the three states of combustion (the state is that the temperature is 1000-1500 ℃, the pressure is negative pressure), stewing (the state is that the temperature is about 1300-1400 ℃, the pressure is 0) and air supply (the state is that the temperature is 1250-1400 ℃, and the pressure is 0.35-0.55 MPa); in the process of the mutual conversion of the three states, the expansion force generated by the influence of the expansion and contraction of heat of the kiln wall bricks and the bricks around the top of the innermost layer is concentrated to the topmost point. The temperature at this point is difficult to detect, but is a critical point in the process requirements. The following detection methods currently exist: the stainless steel protection tube is combined with the thermocouple, the protection tube is inserted into the furnace, a protective sleeve is formed around the protection tube by casting in situ, the thermocouple is protected and is tightly combined with surrounding process bricks, and when energy release (air supply) is carried out, the expansion force of the surrounding bricks extrudes and deforms castable, so that the stainless steel protection tube is extruded and deformed; when energy storage (combustion) is carried out, the expansion force of the peripheral bricks disappears, and the castable can be restored without restoring the stainless steel protective tube, so that air leakage is easy; after a period of work (heat accumulation and energy release), the stainless steel protection tube is twisted by the process brick to become a 'cat claw', so that the thermocouple is damaged. Even if the thermocouple is replaced in the above situation, the service life of the thermocouple is quite short, the thermocouple is replaced once every month at the longest, even if the thermocouple is replaced every week, a great deal of funds are wasted, production is delayed, and the thermocouple has great potential safety hazard.
Disclosure of Invention
The purpose of the utility model is that: the temperature measuring device is reasonable in structure, safe, reliable, convenient to install and long in service life.
In order to overcome the defects in the background technology, the technical scheme provided by the utility model is as follows: the utility model provides a spherical kiln top temperature measuring device of high temperature high pressure, includes instrument source brick, flanged instrument protection tube, purpose-built thermocouple, its characterized in that:
the instrument source taking brick (3) is a bottle plug-shaped semicircle cone, and the center of the cross section is provided with coaxial preformed holes with different diameters from top to bottom; the instrument source brick is positioned in the innermost process brick at the center of the top of the kiln, the flanged instrument protection pipe is inserted into the diameter-changing position of the reserved hole in the instrument source brick and welded on the shell at the center of the top of the kiln, and the special thermocouple is inserted into the flanged instrument protection pipe and extends into the kiln.
The instrument source-taking brick is built in an innermost process brick at the top of a kiln, the material of the instrument source-taking brick is matched with the expansion amount of the process brick at the position, a flexible andalusite is adopted, the instrument source-taking brick is a bottle stopper-shaped semicircle cone, the center of the instrument source-taking brick is provided with preformed holes with different coaxial diameters from the cross section, and the diameters of the upper cross section and the lower cross section of the instrument source-taking brick are the same as or similar to the diameter of a cross section of a hole formed by a process preformed special-shaped brick; the height is equal to or similar to the size of the innermost process brick in view of the vertical section of the casting furnace. Molding under 17MPa, air drying, and baking at 1720deg.C.
The special thermocouple is used for a state that the temperature is less than 1100℃: the high-temperature resistant stainless steel tube, the wind-leakage-preventing device and the armored coupling core are adopted to form a cone structure; for states with temperatures greater than 1100 ℃): the wind leakage preventing device consists of a double-layer protection corundum tube (or recrystallized silicon carbide) and a steel sleeve, a double-core corundum tube, a noble metal coupling wire and a wind leakage preventing facility; the length of the special thermocouple inserted into the kiln is calculated according to the radian of the top of the kiln.
The flanged instrument protection tube is convenient for installing and protecting the thermocouple.
The utility model solves the defects and hidden trouble existing in the background technology. The damage to the temperature measuring instrument caused by displacement generated by thermal expansion and contraction of the process wall bricks and expansion force is overcome, and a safe detection environment is provided; the temperature measuring device has the advantages of reasonable structure, safety, reliability, convenient installation, simple maintenance and replacement, prolonged service life of the temperature measuring instrument and the like, and is an improvement and innovation for measuring the temperature at the top of the high-temperature high-pressure spherical furnace kiln.
Drawings
FIG. 1 is a schematic diagram of a structure of a temperature measuring device at the top of a high-temperature high-pressure spherical kiln;
FIG. 2 is a schematic diagram of the structure of an instrument source brick of a temperature measuring device at the top of a high-temperature high-pressure spherical kiln;
FIG. 3 is a schematic diagram of a special thermocouple structure of a temperature measuring device at the top of a high-temperature high-pressure spherical kiln.
Wherein in the figure: 1. a special thermocouple; 2. an instrument protection tube with a flange; 3. the instrument takes the source brick; 4. the instrument takes the diameter-changing position of the reserved hole in the source brick; 5. spherical kiln top shell; 6. outer layer process bricks at the top of the spherical kiln; 7. intermediate layer process bricks at the top of the spherical kiln; 8. packing between the spherical furnace kiln top outer layer process bricks and the furnace shell; 9. the innermost process brick at the top of the spherical kiln; 10. a special-shaped brick; 11. filling materials between the special-shaped bricks and the instrument source-taking bricks; 12. the instrument takes the upper preformed hole of the source brick; 13. a lower preformed hole of the instrument source brick; 14. a felt; 15. a special thermocouple protection tube; 16. the diameter-changing position of the thermocouple protection tube is specially made; 17. special thermocouple cone protective tube; 18. the tail end face of the special thermocouple is manufactured; 19. an air leakage preventing device of a special thermocouple; 20. a mounting flange of the special thermocouple; 21. thermocouple junction box.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be more fully understood, and so that the scope of the disclosure will be fully conveyed to those skilled in the art. The embodiment takes the temperature measurement (the temperature is less than 1100 ℃) of the top of a pre-combustion chamber of a hot blast stove matched with a 2000m3 blast furnace as an example.
As shown in fig. 1 and 2, the size of the instrument source brick (3) is determined according to the principle: finding out the height H of the innermost process brick (9) at the top of the spherical kiln (the precombustion chamber of the hot blast stove) according to the process drawing 1 The dimension of a reserved semi-conical hole (not shown in the figure) at the top of the process casting furnace, namely the diameter phi of the upper hole 1 Diameter phi of lower opening 2 Determining the size of the instrument source brick (3); meanwhile, for the convenience of installation and the reduction of the workload of installation construction, the height of the instrument source brick (3) is preferably the same as or close to the height of the innermost process brick (9), and the diameters of the upper surface and the lower surface are the same as or close to the diameter of the reserved hole of the process. Processing and manufacturing: according to the process drawing, the height H of the innermost process brick (9) at the top of the precombustion chamber of the hot blast stove matched with a 2000m3 blast furnace 1 The upper opening diameter phi of the technological reserved special-shaped brick opening is 300mm 1 Diameter phi of the lower opening of 300mm 2 180mm, the size of the instrument source brick (3) is a half cone with the height of 300mm, the diameter of the upper surface of 260mm and the diameter of the lower surface of 150 mm; considering that a protective tube for the instrument is DN50, the diameters of an upper reserved hole (12) and a lower reserved hole (13) of the instrument source taking brick are respectively considered as phi 60 and phi 40, and the heights are respectively considered as 3:4, and the size of the inner reserved hole of the instrument source taking brick (3) is 128mm higher than the diameter phi 60 of the upper reserved hole (12) and 172mm higher than the diameter phi 40 of the lower reserved hole (13); manufacturing a steel model according to the size, after the model is manufactured, forging and pressing by using andalusite powder and materials, pouring the mixture into the model, removing the mixture for airing after the molding by using a press, feeding the mixture into a kiln for roasting (roasting is needed to be strictly performed according to a temperature rising curve), discharging the mixture from the kiln after roasting, naturally cooling the mixture, and detecting the size after roasting, particularly the size and error of the preformed holes (12) and (13), not exceeding 3mm, and if not, re-manufacturing the mixture; and (3) finishing the manufacturing of the instrument source brick.
With continued reference to fig. 1, the flanged meter tube (2) is sized: according to the length H from the innermost edge of the innermost process brick (9) at the top of the spherical kiln to the topmost center of the outer shell (5) at the top of the spherical kiln 2 (2000 m3 blast furnace matched hot blast stove precombustion chamber H 2 About 1400 mm), the height H of the reserved hole (13) under the instrument source-taking brick (3) 4 (172 mm), and considering the installation fixing space H at the time of installation 3 (i.e., the space between the spherical kiln top shell (5) and the flange of the flanged meter tube (2), typically 80 mm) to size the flanged meter tube (2); the protection tube for the instrument is DN50 and L 1 1308mm (H) 2 +H 3 -H 4 ) Taking the temperature resistance into considerationThe dimensions of 2520 stainless steel, namely flanged instrument protection tube (2), were chosen as follows: the flange stainless steel pipe having a length of 1308mm, i.e., 2520, of diameter 57X3.5 was manufactured by machining. And finishing the processing of the instrument protection tube (2) with the flange.
With continued reference to fig. 1, 2 and 3, a tailored thermocouple (1) was fabricated. Firstly, according to the medium temperature and pressure parameters, thermocouple graduation number K (for example, K couple is selected below 1100 deg.C), then according to the length L of flanged instrument protection tube (2) 1 Length L inserted into kiln 2 The method comprises the steps of (about 150 mm), determining the height of a meter source brick (3), determining the length of a thermocouple, selecting the material of a protection tube of a special thermocouple (1) according to the characteristics of a measured medium, selecting the taper (namely the diameter-changing position of a thermocouple protection tube) according to the size of the meter source brick (3), selecting an armored core coupling wire for ensuring transportation safety, reprocessing and manufacturing an anti-wind leakage device (19) at the head of the special thermocouple (1) for ensuring operation safety, manufacturing a matched flange (20) of the special thermocouple (1) according to the flange of the flanged meter protection tube (2), and carrying out combined processing and manufacturing or purchase. The specific specification of the special thermocouple (1) is as follows: in order to reduce the blocking force of the thermocouple in the kiln, the thermocouple is as thin as possible, the strength is increased, the service life is prolonged, the outer diameter of the flanged instrument protection tube (2) is considered, a large amount of practical experience and comprehensive consideration are carried out, the junction of the reserved hole (12) on the reserved hole and the reserved hole (13) on the gauge tapping brick (3) at the diameter changing position are selected, the diameter of the tail end face (18) of the special thermocouple is selected to be phi 16 in consideration of stress and abrasion, and a cone protection tube (17) is formed between the diameter changing position (16) and the tail end face (18) of the special thermocouple, and the specification is as follows: diameter 30/. Phi.16, the length (generally 150 mm) of the thermocouple inserted into the furnace is selected by considering the heating of the thermocouple and the radian of the top of the furnace, and then the installation space (the length between the installation flange (20) of the special thermocouple and the thermocouple junction box (21), generally 150mm, and the position of the installation flange (20) in the special thermocouple are also determined), the specification of the special thermocouple (1) is as follows: k, length L is 1780mm (1308+150+172+150), DN50 flange, external diameter phi 30/phi16/2520, part length 1458mm (1308+150) of phi 30 protecting tube (15), and length 322mm (172+150) of cone protecting tube (17), in special thermocoupleA reverse sealing plunger is arranged between the mounting flange (20) and the thermocouple junction box (21) and is used as an anti-wind leakage device (19); the complete set of the special thermocouple (1) is shaped, and the thermocouple is processed and manufactured or purchased according to the shaping.
The three parts of the temperature measuring device at the top of the high-temperature high-pressure spherical kiln are manufactured.
The field installation process is as follows:
with continued reference to fig. 1 and 3, when the furnace is cast into the process special-shaped brick (10) by the pre-chamber of the hot blast furnace, a hole is formed, at this time, the instrument source-taking brick (3) is placed at the center of the hole at the top of the spherical furnace, because of errors in the casting furnace, the space between the special-shaped brick (10) and the instrument source-taking brick (3) is large, and part of special-shaped brick (10) can be reprocessed, so that the space between the processed special-shaped brick (10) and the instrument source-taking brick (3) is smaller than 10mm, and then the packing (11) between the special-shaped brick (10) and the instrument source-taking brick (3) is filled and compacted, and the instrument source-taking brick (3) is not reversely placed (upper thickness and lower thickness) and the lower part of the special-shaped brick is basically flush with the lower part of the innermost process brick (9) at the center of the top of the spherical furnace. After the fixing, inserting the flanged instrument protection tube (2) into the diameter-changing position (4) of the reserved hole in the instrument source-taking brick from the center of the top of the spherical kiln top shell (5), processing and building the middle layer process brick (7) and the outer layer process brick (6) of the spherical kiln top around the flanged instrument protection tube (2) and on the upper part of the instrument source-taking brick (3), tightly holding the flanged instrument protection tube (2), and welding and fixing the flanged instrument protection tube (2) on the spherical kiln top shell (5) after the construction is finished; the special thermocouple (1) is inserted into the flanged instrument protection tube (2), a felt (14) is plugged between the flanged instrument protection tube (2) and the special thermocouple (1) in order to consider heat radiation, then the special thermocouple (1) is fixed with the flanged instrument protection tube (2) by bolts, nuts and gaskets (not shown in the figure), whether the special thermocouple (1) is in a passage or not is tested, and then the anode and the cathode of the thermocouple (1) are connected with an external cable.
When the thermocouple is damaged in work, the anti-wind leakage device (19) is rotated to seal under the condition that the thermocouple is not leaked, and the thermocouple is disassembled to be replaced by a new thermocouple or is sealed by a blind flange (not marked in the figure) under the non-pressure state, so that the safety is ensured. Is simple and practical.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations, such as materials of the various components, geometry of the source brick, dimensions of the internal preformed holes of the source brick, depths of thermocouple insertion, mounting locations and methods, etc., may be made without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (3)
1. The utility model provides a spherical kiln top temperature measuring device of high temperature high pressure, includes that a meter gets source brick, takes flange instrument protection tube, purpose-built thermocouple, its characterized in that:
the instrument source brick is a bottle plug-shaped semicircle cone, and the center of the cross section is provided with coaxial preformed holes with different diameters from top to bottom; the instrument source brick is positioned in the innermost process brick at the center of the top of the kiln, the flanged instrument protection pipe is inserted into the diameter-changing position of the reserved hole of the instrument source brick and welded on the shell at the center of the top of the kiln, and the special thermocouple is inserted into the flanged instrument protection pipe and extends into the kiln.
2. The device for measuring the temperature at the top of a high-temperature high-pressure spherical kiln according to claim 1, wherein the instrument source brick is made of andalusite with flexibility.
3. The device for measuring the temperature at the top of a high-temperature high-pressure spherical kiln according to claim 1, wherein the special thermocouple adopts a cone structure for the state that the temperature is less than 1100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223526577.5U CN219083799U (en) | 2022-12-08 | 2022-12-08 | Temperature measuring device for top of high-temperature high-pressure spherical kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223526577.5U CN219083799U (en) | 2022-12-08 | 2022-12-08 | Temperature measuring device for top of high-temperature high-pressure spherical kiln |
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| Publication Number | Publication Date |
|---|---|
| CN219083799U true CN219083799U (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223526577.5U Active CN219083799U (en) | 2022-12-08 | 2022-12-08 | Temperature measuring device for top of high-temperature high-pressure spherical kiln |
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| CN (1) | CN219083799U (en) |
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- 2022-12-08 CN CN202223526577.5U patent/CN219083799U/en active Active
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