CN102507032B - cracking furnace COT thermocouple - Google Patents
cracking furnace COT thermocouple Download PDFInfo
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- CN102507032B CN102507032B CN201110345022.8A CN201110345022A CN102507032B CN 102507032 B CN102507032 B CN 102507032B CN 201110345022 A CN201110345022 A CN 201110345022A CN 102507032 B CN102507032 B CN 102507032B
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Abstract
The invention provides a kind of cracking furnace COT thermocouple, comprise the terminal box be linked in sequence, upper protection tube, every leakage packoff, joint flange, lower protection tube and measuring junction; The described upper protection tube linked together, every leakage packoff, lower protection tube and measuring junction form an inner chamber, in described inner chamber, be provided with armoured thermocouple, described measuring junction comprises protection body and measuring head, and described measuring head and described protection body link into an integrated entity; Described measuring head and described protection body junction are provided with thermometric groove.The Heat stability is good of COT thermopair of the present invention, measuring accuracy is high.
Description
Technical field
The present invention relates to a kind of thermopair, particularly a kind of thermopair for measuring second rare device Control for Pyrolysis Furnace Area temperature.
Background technology
Need to arrange the temperature element measuring Control for Pyrolysis Furnace Area temperature, to monitor the process of cracking in ethane cracking furnace.For reaching this purpose, major way arranges thermopair in crack furnance radiation section furnace tube exit, and measure the temperature in this exit, the thermopair of employing is called as COT(CoilOutletTemperature) thermopair.
The principle of work of thermopair is based on thermoelectric effect.Thermoelectric effect refers to that conductor (being called as thermocouple wire material or thermode in the thermopair) two ends of two kinds of unlike materials are bonded into loop, when the temperature at two abutments is different, will produce electromotive force in the loop.The main element of thermopair is exactly thermode, and in order to protect thermode, need thermode to be arranged in protection tube, be also filled with insulating material in protection tube, this thermopair is called as armoured thermocouple (see Fig. 3).One end that thermopair touches measured medium is working end, and the other end is cold junction.Cold junction is connected with Displaying Meter or matching instrument, and Displaying Meter can point out the thermoelectrical potential that thermopair produces.Thermopair is actually a kind of energy converter, and thermal power transfer is electric energy by it, characterizes temperature by the thermoelectrical potential produced.The thermoelectrical potential of thermopair is the difference of two thermode temperature funtions of thermopair working end, instead of the function of thermocouple cold junction and working end temperature difference.The size of the thermoelectrical potential produced, when the material of thermode is even, has nothing to do with the length of thermode and diameter, only relevant with the temperature difference at the composition of thermode material, working end and cold junction two ends.After the material of thermode is determined, to produce the size of thermoelectrical potential only relevant with the temperature difference of working end and cold junction.Further, if the temperature of cold junction keeps certain, thermoelectrical potential is only the single-valued function of working end temperature.
When pyrolysis furnace is in running order, the environment of its inside is: temperature is between 800 DEG C-900 DEG C, and the flow velocity of detected fluid medium is 138-175m/s.As can be seen here, COT thermopair should possess certain resistance to erosion safeguard measure, makes the temperature that still can record fluid media (medium) under working environment harsh so accurately and efficiently.
Fig. 1 shows existing a kind of COT thermopair, comprise be linked in sequence terminal box 1, every leakage packoff 2, joint flange 3, lower protection tube 4 and measuring junction 5.After leakage packoff 2, joint flange 3, lower protection tube 4 are connected with measuring junction 5, define the inner chamber 6 of a strip, armoured thermocouple is arranged in inner chamber 6.The working end of described armoured thermocouple is positioned at measuring junction 5, and measuring junction 5 contacts with measured medium and measures; The cold junction of described armoured thermocouple is positioned at terminal box 1, is connected with cable.Because lower protection tube 4 and measuring junction 5 are understood and detected fluid medium contact, therefore, lower protection tube 4 and measuring junction 5 are all made up of High-temperature resistant alloy material, and carry out the surface treatment improving wearing quality.: the first, if measuring junction 5 breaks, when high temperature fluid upwards leaks along armoured thermocouple, every leakage packoff 2 effectively barrier fluid, avoid high temperature fluid to leak further every leakage packoff 2 Main Function; The second, the high temperature of the lower protection tube 4 of isolation and this side of measuring junction 5, avoids the temperature of cold junction in butted line box to have an impact.
An important indicator of COT thermopair keeps precision, and this is embodied in three aspects: the sensitivity of COT thermopair, thermal stability (the COT thermopair that makes as far as possible namely under duty avoids measuring accuracy to decline in a long time) and serviceable life.
Summary of the invention
In order to improve described precision and the serviceable life of COT thermopair, guaranteeing significantly improving of ethylene furnace seed output and quality, the invention provides a kind of cracking furnace COT thermocouple.
Technical scheme of the present invention is as follows:
A kind of cracking furnace COT thermocouple, comprise the terminal box be linked in sequence, upper protection tube, every leakage packoff, joint flange, lower protection tube and measuring junction; The described upper protection tube linked together, every leakage packoff, lower protection tube and measuring junction form an inner chamber, in described inner chamber, be provided with armoured thermocouple, described measuring junction comprises protection body and measuring head, and described measuring head and described protection body link into an integrated entity; Described measuring head and described protection body junction are provided with thermometric groove.
Manufacture in the process of described armoured thermocouple, envionmental humidity is less than or equal to 25%.
Described protection body is the combination of terrace with edge and pyramid, and the bottom surface of described terrace with edge is arranged near described lower protection tube, and the bottom surface of described pyramid is arranged on the upper bottom surface of described terrace with edge.
In the junction of described measuring head and described protection body, the width of described protection body is greater than the width of described measuring head; The described protection body of described measuring head both sides is respectively arranged with described thermometric groove.
Described measuring head end is separated with described protection body by described thermometric groove.
If described measuring junction extend into described cracking furnace pipe part, the projected area on the xsect of described cracking furnace pipe is a; The projected area of described cracking furnace pipe inner chamber on described xsect is b; Then, the value of a/b is 1.2 ~ 2.5%.
The volume that described protection body extend into described cracking furnace pipe part is 1200-6500 cubic millimeter.
Described joint flange is provided with suspension ring.
Described joint flange is provided with ejection screw; Described cracking furnace COT thermocouple also comprises the ejection bolt mated with described ejection screw; Described in the ejection of described ejection bolt, the distance of joint flange movement is less than or equal to 1 centimetre.
When described COT thermopair is assembled to described pyrolysis furnace, described lower protection tube and measuring junction stretch into from one end of equipment connection pipe, and the other end of described equipment connection pipe is communicated with cracking furnace pipe; Distance between the outer wall of described lower protection tube and described equipment connection inside pipe wall is less than or equal to 2 millimeters.
Described measuring junction is 50-120 millimeter in the length of described lower protection tube axis direction.
Described armoured thermocouple comprises two thermodes, and the spacing L of the parallel portion of described two thermodes is 0.73-1.08 millimeter.
Minor increment M between the protection tube inwall of described thermode and described armoured thermocouple is 0.73-1.08 millimeter; L and M is equal.
The material of described terminal box is spheroidal-graphite cast iron.
Described sealing and connecting device comprises the seal connector, the packing seal web member that are linked in sequence; Described seal connector is connected with described upper protection tube, and described packing seal web member is connected with described joint flange; Cylindrical graphite sealing gasket is provided with between described seal connector and described packing seal web member; Conical graphite sealing gasket is provided with between described packing seal web member and described joint flange.
Technique effect of the present invention:
Thermometric groove is arranged between protection body and measuring head, turbulent flow is formed when fluid media (medium) enters into around measuring head, thermometric groove adds the thermometric area of measuring head on the one hand, aggravate turbulent flow on the other hand, extend the time that fluid media (medium) stops near measuring head, this is all conducive to the accurate thermometric of measuring head.
In addition, affect a lot of because have of COT thermopair precision, people often pay close attention to the conventional factors such as purity as insulating material in armoured thermocouple, and to ignore in manufacture armoured thermocouple process ambient humidity to the impact of final COT thermopair precision.In manufacture armoured thermocouple process, the insulating material that armoured thermocouple uses easily absorbs the moisture in air.The moisture distribution that insulating material absorbs is relatively more even, and armoured thermocouple uses at low temperatures, not adverse influence.When the temperature that armoured thermocouple is measured is more than 300 degrees Celsius, the moisture in insulating material starts to assemble, and namely the distribution of moisture in insulating material starts to occur uneven trend, thus the measuring accuracy of moisture to armoured thermocouple has a negative impact.Concrete impact be exactly make the distortion of armoured thermocouple measurement result, such as, measurement result is lower than actual temperature.The distortion of armoured thermocouple measurement result can bring following consequence: lower than actual temperature during the measurement result of specific armoured thermocouple, time and higher than actual temperature; Due in actual use, be all that multiple thermopair is measured same medium, now the inconsistency of the measurement result of multiple thermopair strengthens.These consequences all make the production of pyrolysis furnace to continue, and must change thermopair, cause cost increase.Technical scheme of the present invention limits ambient humidity when manufacturing armoured thermocouple, and the moisture that effectively prevent in air penetrates into armoured thermocouple in the fabrication process, improves the precision of armoured thermocouple.
Accompanying drawing explanation
Fig. 1 is the external structure of existing COT thermopair.
Fig. 2 is the cut-open view of one section of sheathed cable.
Fig. 3 is the cut-open view of armoured thermocouple thermometric end.
Fig. 4 is the elevational cross-sectional view of the on a rare occasion individual embodiment of COT thermoelectricity of the present invention.
Fig. 5 is vertical view embodiment illustrated in fig. 4.
Fig. 6 is upward view embodiment illustrated in fig. 4.
Fig. 7 is the stereographic map of thermometric end embodiment illustrated in fig. 4.
Fig. 8 is the elevational cross-sectional view of COT thermopair of the present invention second embodiment.
Fig. 9 is vertical view embodiment illustrated in fig. 8.
Figure 10 is upward view embodiment illustrated in fig. 8.
Figure 11 is the stereographic map of thermometric end embodiment illustrated in fig. 8.
Figure 12 is the elevational cross-sectional view of COT thermopair of the present invention 3rd embodiment.
Figure 13 is vertical view embodiment illustrated in fig. 12.
Figure 14 is upward view embodiment illustrated in fig. 12.
Figure 15 is the stereographic map of thermometric end embodiment illustrated in fig. 12.
Figure 16 is the wiring layout of COT the installation of TC of the present invention to pyrolysis furnace.
In figure, mark is described as follows:
1, terminal box; 2, every leakage packoff; 3, joint flange; 4, lower protection tube; 5, measuring junction; 6, inner chamber;
7, protection tube; 8, inwall; 9, thermode; 10, insulating packing; 11, solder joint;
12, terminal box; 13, upper protection tube; 14, seal connector; 15, cylindrical graphite sealing gasket; 16, packing seal web member; 17, conical graphite sealing gasket; 18, flange-interface part; 19, suspension ring; 20, ejection bolt; 21, joint flange; 22, lower protection tube; 23, armoured thermocouple; 24, measuring junction; 25, thermometric groove; 26, protection body; 27, measuring head;
28, terminal box; 29, upper protection tube; 30, seal connector; 31, cylindrical graphite sealing gasket; 32, packing seal web member; 33, conical graphite sealing gasket; 34, flange-interface part; 35, suspension ring; 36, ejection bolt; 37, joint flange; 38, lower protection tube; 39, armoured thermocouple; 40, measuring junction; 41, thermometric groove; 42, protection body; 43, measuring head;
44, terminal box; 45, upper protection tube; 46, seal connector; 47, cylindrical graphite sealing gasket; 48, packing seal web member; 49, conical graphite sealing gasket; 50, flange-interface part; 51, suspension ring; 52, ejection bolt; 53, joint flange; 54, lower protection tube; 55, armoured thermocouple; 56, measuring junction; 57, protection body; 58, measuring head;
59, joint flange; 60, nozzle flange; 61, lower protection tube; 62, equipment connection pipe; 63, measuring junction; 64, cracking furnace pipe; 65, metal catheter.
Embodiment
Below technical scheme of the present invention is described in detail.
Composition graphs 2 and Fig. 3 illustrate the manufacture process of armoured thermocouple in COT thermopair of the present invention.In advance two rhizoid shape thermodes 9 are arranged in protection tube 7; and insulating packing 10(magnesia powder is filled in protection tube 7); to ensure between two thermodes 9 parallel simultaneously; define sheathed cable after completing above-mentioned steps, the structure namely shown in Fig. 2 is the cable-like structure that extends to form of both direction up and down.The sheathed cable manufactured can coil into a volume and be convenient to deposit as cable.
The above-mentioned sheathed cable of armoured thermocouple of the present invention manufactures, and in following process for making, the relative humidity of environment (environment here refers to the environment performing following step process place, as workshop) is less than and equals 25%:
1, intercept one section of 1 meter of (different according to the model of armoured thermocouple, length can be different) length from sheathed cable, and be drawn into straightened condition.This section before manufacturing armoured thermocouple referred to as cable.
2, in one end of described cable, welded by two thermodes 9, form solder joint 11 after welding, the diameter of solder joint 11 is approximately 1.6 times of the diameter of thermode 9.
3, by protection tube 7 solder up of this one end of solder joint 11, form the thermometric end of encirclement solder joint 11 as shown in Figure 3, now should be full of insulating packing 10 in thermometric end.
4, the protection tube 7 of the cable other end is cut a bit of, remove insulating packing 10, expose a bit of of two thermodes 9.
5, dry processing through 4 two thermodes 9 exposed at 350-450 DEG C (can repeat to dry).
6, the end tetrafluoroethene processing two thermodes 9 exposed through 5 is separated.
7, entangled by the end shutoff cover of two thermodes 9 handled in 6, the end of two thermodes 9 is through shutoff cover.
8, described shutoff cover and cable are clamped.
9, cable is arranged described shutoff and overlap this one end encapsulating.
In the process of above-mentioned manufacture armoured thermocouple, the thermal stability impact of control on final thermopair of ambient humidity is very large, and table one shows the different impact on the thermal stability of final armoured thermocouple of ambient humidity in the process manufacturing armoured thermocouple.
Table one
The contrast experiment of the experimental data in acquisition table one is described.
The first step, tests as follows to the solder joint of the armoured thermocouple manufactured under varying environment humidity: measure solder joint thermopower value at different temperatures, temperature is respectively 400 DEG C, 600 DEG C and 800 DEG C.
Second step, is made into COT thermopair by the armoured thermocouple manufactured under varying environment humidity.Last these COT thermopairs 192 hours aging respectively under the actual working environment of 900 DEG C, and then measure thermode solder joint thermopower value at different temperatures, temperature is respectively 400 DEG C, 600 DEG C and 800 DEG C.
In addition, under 500 DEG C and 900 DEG C of conditions, test the insulating resistance value of armoured thermocouple respectively.The equipment of test armoured thermocouple insulating resistance value comprises: digital multimeter, detected temperatures 300 ~ 1200 DEG C of electric thermo-couple test furnaces, low potential switch, 500V0-2000M Ω megohmmeter, freezing point calibration cell.The method of test armoured thermocouple insulating resistance value is summarized as follows:
First, the measuring junction of detected armoured thermocouple and standard platinum rhodium 10-platinum thermocouple high temperature wire bundle are bundled into circle a branch of.
Secondly, loaded in electric thermo-couple test furnace by the above-mentioned thermopair tying up bunchy, the measuring junction of thermopair should be in assay furnace highest temperature district center, and standard couple is consistent with assay furnace axial location.
3rd, assay furnace fire door, around thermopair bundle, blocks up with insulating refractories.
4th, the standard couple reference edge tied up with detected armoured thermocouple is connected with copper conductor, and tie point inserts freezing point calibration cell, and the copper conductor other end is connected with low potential switch, low potential switch and digital versatile list catenation.
5th, assay furnace is warmed up to 500 DEG C or 900 DEG C.500V0-2000M Ω megohmmeter binding post is contacted the armoured thermocouple reference edge of tested detection, another root binding post contacts tested thermopair shell, and it is exactly detected armoured thermocouple insulation values that pointer stablizes rear pointed value.
The experimental data obtained by table one can obtain as drawn a conclusion:
1, the ambient humidity manufacturing thermopair is lower, and after long duty, the thermopower of the solder joint of thermode trends towards increasing, and this is conducive to the thermal stability improving COT thermopair.Under normal circumstances, through Long-Time Service, can there is preferential oxidation in the chromium in the positive pole of thermode, and thermoelectrical potential can slowly decline, and this change is unfavorable for the thermal stability of COT thermopair.Control through ambient humidity, the thermopower of the solder joint of thermode trends towards increasing, and is therefore conducive to the thermal stability improving COT thermopair.
2, under thermode is in high temperature, due to thermal expansion effects, the insulating resistance value of armoured thermocouple can be made to reduce, and insulation resistance value is lower, more unfavorable to the precision of thermopair, and insulation resistance value is minimum also will keep 2M Ω.From table one, the ambient humidity manufacturing thermopair is lower, and the insulating resistance value of armoured thermocouple is higher.This conclusion can be applicable to manufacture the COT thermopair at high temperature with high insulating resistance value.
3, can see from the data of table one, the ambient humidity of preferred manufacture thermopair is between 21% to 25%.
In order to improve the thermal stability of COT thermopair further, the spacing of two thermode parallel portion is between 0.73-1.08 millimeter.Such as, when the diameter of thermode is 6 millimeters, the spacing of two thermode parallel portion is 0.73 millimeter-0.79 millimeter; When the diameter of thermode is 8 millimeters, the spacing of two thermode parallel portion is 0.97 millimeter-1.08 millimeters.
Also be the thermal stability in order to improve COT thermopair, the minor increment between the protection tube inwall of thermode and described armoured thermocouple is 0.73-1.08 millimeter.Such as, the minor increment when the diameter of thermode is 6 millimeters and between the protection tube inwall of described armoured thermocouple is 0.73 millimeter-0.79 millimeter; Minor increment when the diameter of thermode is 8 millimeters and between the protection tube inwall of described armoured thermocouple is 0.97 millimeter-1.08 millimeters.More excellent mode makes the spacing of two thermode parallel portion equal with the distance between thermode and the protection tube inwall of described armoured thermocouple.
Fig. 4 to Fig. 7 shows first embodiment of COT thermopair of the present invention, comprise be linked in sequence terminal box 12, upper protection tube 13, every leakage packoff, joint flange 21, lower protection tube 22 and measuring junction 24.Wherein, comprise every leakage packoff: the seal connector 14 be linked in sequence and packing seal web member 16; the upper end of seal connector 14 is connected with the lower end of upper protection tube 13; the lower end of packing seal web member 16 is connected with joint flange 21 by flange-interface part 18; be provided with cylindrical graphite sealing gasket 15 between seal connector 14 and packing seal web member 16, between packing seal web member 16 and flange-interface part 18, be provided with conical graphite sealing gasket 17.The sealing gasket of graphite material has the strong feature of plasticity, after armoured thermocouple 23 is seated through seal connector 14, cylindrical graphite sealing gasket 15, packing seal web member 16 and conical graphite sealing gasket 17, after dismounting armoured thermocouple 23 also assembles again, still can bear the pressure of 10Mpa every leakage packoff, reduce replacement cost.Cylindrical graphite sealing gasket 15 and conical graphite sealing gasket 17 manufacture process are: by high-carbon scale graphite through chemical treatment, high-temperature expansion is rolled into graphite paper, are pressed into sealing gasket by high for graphite paper.The thickness of graphite paper is 0.2mm to 0.4mm, and the end face plane of the sealing gasket of the graphite paper manufacture of such thickness is smooth, periphery is smooth, and bore inner walls is smooth, size uniform, assembles rear good seal performance with armoured thermocouple 23, and finished product sealing gasket is non-friable.Cylindrical graphite sealing gasket 15 and conical graphite sealing gasket 17 can tolerate the high temperature of 800 DEG C, still can bear the pressure of 5Mpa at 600 DEG C.This makes the security of COT thermopair of the present invention greatly improve, and such as, when operation of starting shooting controls unstable superhigh temperature more than 1000 DEG C, the softening gas leakage of lower protection tube 22, this effectively can be avoided the generation of leakage after leaking double seal.The right alignment of seal connector 14, cylindrical graphite sealing gasket 15, packing seal web member 16 and conical graphite sealing gasket 17 is less than or equal to 0.05 millimeter, and the sealing property every leaking packoff can be made more excellent.After seal connector 14, cylindrical graphite sealing gasket 15, packing seal web member 16 and conical graphite sealing gasket 17 assemble, distance between seal connector 14 and packing seal web member 16 is greater than and equals 5 millimeters, distance between packing seal web member 16 and flange-interface part 18 is less than and equals 2 millimeters, and the taper number of degrees of conical graphite sealing gasket 17 differ 2.5 ° with the flange-interface part 18 inner conical number of degrees.
The upper protection tube 13 linked together, every leakage packoff, joint flange 21, lower protection tube 22 and measuring junction 24 form a strip inner chamber; arrange armoured thermocouple 23 at described inner chamber, described armoured thermocouple 23 is directive to be inserted in measuring junction lumen orifice through metal catheter 65.The material of terminal box 12 is spheroidal-graphite cast iron, and concrete model is QT450-10.Ductile cast iron material has good plasticity and toughness, and heat-proof quality is good, and pyrolysis furnace site environment temperature is high, and will avoid the interference being subject to external high temperature in terminal box 12, the ductile cast iron material that therefore heat-proof quality is good is good selection.Armoured thermocouple 23 manufactures under envionmental humidity is less than or equal to 25% condition, has good thermal stability.
Can see from Fig. 4 and Fig. 5, uniform 2 suspension ring 19 and 4 ejection screws on joint flange 16.Ejection bolt 20 has been screwed in 4 ejection screws.When COT thermopair is after using for a long time, meeting coking on the outer wall of lower protection tube 22, is bonded at COT thermopair on equipment connection pipe and is difficult to take out.Suspension ring 19 provide the force application part of lift COT thermopair, are convenient to the COT thermopair pull-out that will be bonded on equipment connection pipe.Also for ease of convenient lift COT thermopair, be provided with ejection screw, ejection screw runs through joint flange 21, ejection screw disconnected screw, the equipment connection nozzle flange dish of corresponding ejection screw do not have through hole, when needs lift COT thermopair from equipment connection pipe, rotated by ejection bolt 20, ejection bolt 20 advances until top is to equipment connection nozzle flange dish to equipment connection nozzle flange dish.Further rotate ejection bolt 20, ejection bolt 20 can be made to be lifted from equipment connection pipe by COT thermopair as lifting jack.When coking is more serious; simple use ejection bolt 20 can't get up COT thermopair from the lift of equipment connection pipe; now further rotate ejection bolt 20 and then mobile link flange 21 again, equipment connection nozzle flange adjustment debit can be caused bad, lower protection tube 22 even also can be caused to damage.For this reason, the distance limiting the movement of ejection bolt 20 ejection joint flange 21 is less than or equal to 1 centimetre, preferably 0.5 centimetre.The distance of ejection bolt 20 ejection joint flange 21 movement, within the scope of this, effectively can loosen coking place, then be aided with suspension ring 19 lift get up joint flange 21, avoid the generation of above-mentioned damage.
The structure of measuring junction 24 can be seen from Fig. 4, Fig. 6 and Fig. 7.Measuring junction 24 processes with solid blank, and one end of measuring junction 24 is the end be connected with lower protection tube 22, is a disk, and the diameter of this disk is identical with the external diameter of lower protection tube 22, and is connected with lower protection tube 22.From described disk boring, this hole is for holding the thermometric end of armoured thermocouple 23.At the other end of measuring junction 24, be processed into two parts---protection body 26 and measuring head 27.Protection body 26 and measuring head 27 one-body molded, the external dimensions of protection body 26 and volume are greater than external dimensions and the volume of measuring head 27.Protection body 26 is the combination of a terrace with edge and a pyramid from the appearance, and the bottom surface of terrace with edge is arranged near described lower protection tube, and namely the bottom surface of terrace with edge is arranged on described disk, and the bottom surface of described pyramid is arranged on the upper bottom surface of described terrace with edge.Certainly, protection body 26 itself is as a whole, and above-mentioned terrace with edge and the shape of pyramid to protection body 26 of utilizing is described, and only in order to express easily, and does not mean that protection body 26 is divided into terrace with edge and pyramid two parts.For the ease of understanding, provide the concept of pyramid and terrace with edge: if a polyhedral face is polygon, all the other each faces are the triangles having a public vertex, and so this polyhedron is called pyramid; The bottom surface of pyramid and be parallel to this bottom surface a cross section between part, be called terrace with edge.
For holding the hole of the thermometric end of armoured thermocouple 23 in measuring head 27, the thermometric end of measuring head 27 pairs of armoured thermocouples 23 forms protection.As shown in the figure, the small volume of measuring head 27, namely thermometric end (the thermometric end with reference to comprising solder joint 11 shown in the figure 3) external protection of armoured thermocouple is thin, and the thermometric end being beneficial to armoured thermocouple 23 can and be responded in time to the temperature variation of outside.Protection body 26 is greater than the width of measuring head 27 at the width with measuring head 27 junction, stops that fluid media (medium) is to the impact of measuring head 27.Protection body 26 has multiple anti-impact brush finish in this side of measuring head 27 dorsad, and antiscour mask has higher intensity.Protection body 26 and measuring head 27 junction are provided with thermometric groove 25.Thermometric groove 25 is arranged on protection body 26, is positioned at the both sides of measuring head 27, and thermometric groove 25 is the groove that oblique temperature measuring head direction is outputed.The effect of thermometric groove 25 is: form turbulent flow when fluid media (medium) enters into measuring head 27 surrounding, thermometric groove 25 1 aspect adds the thermometric area of measuring head 27, aggravate turbulent flow on the other hand, extend the time that fluid media (medium) stops near measuring head 27, this is all conducive to measuring head 27 accurately thermometric.
The material of lower protection tube 22 is chrome-nickel alloy steel, and wherein chromium content is 20 ~ 33%, nickel content 30 ~ 42%, such as, Incoloy800H, Incoloy800, XH45M.The requirement of protection tube 22 under the intensity compound of this material, simultaneously relative inexpensiveness.
Fig. 8 to Figure 11 shows another embodiment of COT thermopair of the present invention.Fig. 8 is to embodiment illustrated in fig. 11 identical to the effect of following structure of the same name in embodiment illustrated in fig. 7 with Fig. 4: terminal box 28, every leaking packoff, suspension ring 35, ejection bolt 36, joint flange 37, lower protection tube 38, armoured thermocouple 39, described armoured thermocouple 39 is directive to be inserted in measuring junction lumen orifice through metal catheter 65.Wherein, seal connector 30, cylindrical graphite sealing gasket 31, packing seal web member 32 are connected with conical graphite sealing gasket 33 order, constitute described every leakage packoff.Fig. 8 is measuring junction 40 with Fig. 4 to difference embodiment illustrated in fig. 7 to embodiment illustrated in fig. 11, and the volume of the volume ratio protection body 26 of the protection body 42 of measuring junction 40 is smaller, and thermometric groove 41 is the groove directly outputed between protection body 42 and measuring head 43.Protection body 42 and measuring head 43 are separated by thermometric groove 41.Figure 11 shows the spatial structure of measuring junction 40.This set of thermometric groove 41 has following benefit: protection body 42 and measuring head 43 are substantially or one is connected, and when fluid media impingement, the intensity of measuring head 43 is still higher; Thermometric groove 41 makes the end of measuring head 43 give prominence to, and end is the main portions of thermometric, and the contact area added with fluid media (medium) is given prominence in end, improves temperature measurement accuracy.
Figure 12 to Figure 15 shows the 3rd embodiment of COT thermopair of the present invention.Figure 12 is to embodiment illustrated in fig. 15 identical to the effect of following structure of the same name in embodiment illustrated in fig. 7 with Fig. 4: terminal box 44, every leaking packoff, suspension ring 51, ejection bolt 52, joint flange 53, lower protection tube 54, armoured thermocouple 55, described armoured thermocouple 55 is directive to be inserted in measuring junction lumen orifice through metal catheter 65.Wherein, seal connector 46, cylindrical graphite sealing gasket 47, packing seal web member 48 are connected with conical graphite sealing gasket 49 order, constitute described every leakage packoff.Figure 12 is measuring junction 56 with Fig. 4 to difference embodiment illustrated in fig. 7 to embodiment illustrated in fig. 15.Measuring junction 56 comprises protection body 57 and measuring head 58, and protection body 57 is separated setting with measuring head 58, and the shape of protection body 57 is semisphere.Figure 15 shows the spatial structure of measuring junction 56.The hemispheric shape of protection body 57 means that anti-impact brush finish (namely protection body is subject to the face that fluid media (medium) washes away) is hemisphere face.Flow direction that is best due to anti-impact brush finish and fluid media (medium) is at an angle, and therefore, the angle that the angle direction of anti-impact brush finish extend into cracking furnace pipe for COT thermopair has a definite limitation.And anti-impact brush finish to be hemisphere face can avoid this restriction, there is change to a certain degree in the angle that COT thermopair extend into cracking furnace pipe, hemisphere face can keep the angular relationship of the best with the flow direction of fluid media (medium).
Figure 16 shows the state of COT the installation of TC of the present invention to pyrolysis furnace.As can see from Figure 16; the lower protection tube 61 of COT thermopair and measuring junction 63 enter from one end of equipment connection pipe 62 and make measuring junction 63 extend into cracking furnace pipe 64; the joint flange 59 of COT thermopair is connected with the nozzle flange 60 of equipment connection pipe 62; distance between lower protection tube 61 and equipment connection pipe 62 inwall is less than or equal to 2 millimeters; this distance decreases the probability of coking between lower protection tube 61 and equipment connection pipe 62 inwall; avoid simultaneously apart from excessive be fluid media (medium) upwards crossfire, this can make the accuracy of COT thermocouple temperature measurement reduce.
How many needs that measuring junction 63 extend into cracking furnace pipe 64 consider: measuring junction 63 stretches into excessive, and measuring junction 63 can stop the media flow in cracking furnace pipe 64, and then reduce the quantity and quality of product of pyrolysis furnace; Measuring junction 63 stretches into too small, then the contact of measuring head and fluid media (medium) is insufficient, can not accurate thermometric.For this reason, the stretch into amount of the present invention to measuring junction 63 limits as follows: supposing that measuring junction 63 extend into cracking furnace pipe 64 part at the area of the upper projection of the xsect (i.e. the plane of vertical cracking furnace pipe axis) of cracking furnace pipe 64 is a, the area that cracking furnace pipe 64 inner chamber projects on this xsect is b, then, when the value of a/b is 1.2 ~ 2.5%, measuring junction 63 thermometric is accurate, simultaneously minimum to the seed output and quality adverse effect of the product of pyrolysis furnace.The volume that the protection body of measuring junction 63 extend into the part of cracking furnace pipe 64 is 1200-6500 cubic millimeter.Volume protection body being extend into the part of cracking furnace pipe 64 carries out restriction following meaning: the volume that protection body stretches into cracking furnace pipe 64 is too small, is unfavorable for forming effective protection to the measuring head of measuring junction 63; If the volume that protection body stretches into cracking furnace pipe 64 is excessive, then fluid medium is formed and stops, directly causes output to reduce.
Measuring junction 63 is preferably 50-120 millimeter in the length of the axis direction of lower protection tube 61.Because measuring junction 63 is welded on lower protection tube 61, the intensity near weld seam is lower, and under the effect of cracking furnace pipe 64 inner fluid medium, this length is equivalent to torque arm length, if long, easily near weld seam, forms cracking; If this length is too short, fluid media (medium) can form direct impact to lower protection tube 61, and the intensity of lower protection tube 61 is lower, can reduce the serviceable life of COT thermopair.
It should be noted that and the foregoing is only preferred embodiment of the present invention, not thereby limit scope of patent protection of the present invention, the present invention can also adopt equivalent technologies to replace.Therefore the equivalence change that all utilizations instructions of the present invention and diagramatic content are done, or directly or indirectly apply to other correlative technology fields and be all in like manner all contained in the scope that the present invention contains.
Claims (14)
1. a cracking furnace COT thermocouple, comprise the terminal box be linked in sequence, upper protection tube, every leakage packoff, joint flange, lower protection tube and measuring junction; The described upper protection tube linked together, every leakage packoff, lower protection tube and measuring junction form an inner chamber, armoured thermocouple is provided with in described inner chamber, it is characterized in that: described measuring junction comprises protection body and measuring head, described measuring head and described protection body link into an integrated entity; Described measuring head and described protection body junction are provided with thermometric groove, and described thermometric groove is arranged on protection body, is positioned at temperature measuring head both sides, and thermometric groove is the groove that oblique temperature measuring head direction is outputed.
2. cracking furnace COT thermocouple according to claim 1, is characterized in that: manufacture in the process of described armoured thermocouple, envionmental humidity is less than or equal to 25%.
3. cracking furnace COT thermocouple according to claim 1 or 2; it is characterized in that: described protection body is the combination of terrace with edge and pyramid; the bottom surface of described terrace with edge is arranged near described lower protection tube, and the bottom surface of described pyramid is arranged on the upper bottom surface of described terrace with edge.
4. cracking furnace COT thermocouple according to claim 3, is characterized in that: in the junction of described measuring head and described protection body, the width of described protection body is greater than the width of described measuring head.
5. cracking furnace COT thermocouple according to claim 3, is characterized in that: set described measuring junction to extend into the projected area of cracking furnace pipe part on the xsect of described cracking furnace pipe as a; The projected area of described cracking furnace pipe inner chamber on described xsect is b; Then, the value of a/b is 1.2 ~ 2.5%.
6. cracking furnace COT thermocouple according to claim 5, is characterized in that: the volume that described protection body extend into described cracking furnace pipe part is 1200-6500 cubic millimeter.
7. cracking furnace COT thermocouple according to claim 6, is characterized in that: on described joint flange, be provided with suspension ring.
8. cracking furnace COT thermocouple according to claim 7, is characterized in that: on described joint flange, be provided with ejection screw; Described cracking furnace COT thermocouple also comprises the ejection bolt mated with described ejection screw; Described in the ejection of described ejection bolt, the distance of joint flange movement is less than or equal to 1 centimetre.
9. cracking furnace COT thermocouple according to claim 8, it is characterized in that: when described COT thermopair is assembled to described pyrolysis furnace, described lower protection tube and measuring junction stretch into from one end of equipment connection pipe, and the other end of described equipment connection pipe is communicated with cracking furnace pipe; Distance between the outer wall of described lower protection tube and described equipment connection inside pipe wall is less than or equal to 2 millimeters.
10. cracking furnace COT thermocouple according to claim 9, is characterized in that: described measuring junction is 50-120 millimeter in the length of described lower protection tube axis direction.
11. cracking furnace COT thermocouples according to claim 10, it is characterized in that: described armoured thermocouple comprises two thermodes, the spacing L of the parallel portion of described two thermodes is 0.73-1.08 millimeter.
12., according to cracking furnace COT thermocouple described in claim 11, is characterized in that: the minor increment M between the protection tube inwall of described thermode and described armoured thermocouple is 0.73-1.08 millimeter; L and M is equal.
13., according to cracking furnace COT thermocouple described in claim 12, is characterized in that: the material of described terminal box is spheroidal-graphite cast iron.
14., according to cracking furnace COT thermocouple described in claim 13, is characterized in that: described every leakage packoff comprise the seal connector, the packing seal web member that are linked in sequence; Described seal connector is connected with described upper protection tube, and described packing seal web member is connected with described joint flange; Cylindrical graphite sealing gasket is provided with between described seal connector and described packing seal web member; Conical graphite sealing gasket is provided with between described packing seal web member and described joint flange.
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| CN201110345022.8A CN102507032B (en) | 2011-11-04 | 2011-11-04 | cracking furnace COT thermocouple |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2932341Y (en) * | 2006-10-17 | 2007-08-08 | 乐清市伦特电子仪表有限公司 | Cracking oven COT thermocouple anti-scouring sleeve |
| CN201289405Y (en) * | 2008-12-30 | 2009-08-12 | 乐清市伦特仪表有限公司 | Special-purpose thermoelectric couple for measurement of degradation and coking resistance of pyrolysis furnace COT |
| CN201844889U (en) * | 2010-11-12 | 2011-05-25 | 浙江伦特机电有限公司 | Temperature sensor for high-temperature and low-temperature measurement of hearth |
| CN202403823U (en) * | 2011-11-04 | 2012-08-29 | 吴方立 | Cracking furnace COT thermocouple |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008096215A (en) * | 2006-10-10 | 2008-04-24 | Kawasaki Precision Machinery Ltd | Sheathed thermocouple for measuring temperature in high pressure domain, and its manufacturing method |
| CN201575871U (en) * | 2010-01-08 | 2010-09-08 | 浙江伦特机电有限公司 | COT thermocouple for tapered cracking furnace |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2932341Y (en) * | 2006-10-17 | 2007-08-08 | 乐清市伦特电子仪表有限公司 | Cracking oven COT thermocouple anti-scouring sleeve |
| CN201289405Y (en) * | 2008-12-30 | 2009-08-12 | 乐清市伦特仪表有限公司 | Special-purpose thermoelectric couple for measurement of degradation and coking resistance of pyrolysis furnace COT |
| CN201844889U (en) * | 2010-11-12 | 2011-05-25 | 浙江伦特机电有限公司 | Temperature sensor for high-temperature and low-temperature measurement of hearth |
| CN202403823U (en) * | 2011-11-04 | 2012-08-29 | 吴方立 | Cracking furnace COT thermocouple |
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