CN203396502U - Gasification furnace thermocouple - Google Patents
Gasification furnace thermocouple Download PDFInfo
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- CN203396502U CN203396502U CN201320378630.3U CN201320378630U CN203396502U CN 203396502 U CN203396502 U CN 203396502U CN 201320378630 U CN201320378630 U CN 201320378630U CN 203396502 U CN203396502 U CN 203396502U
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Abstract
The utility model relates to a gasification furnace thermocouple. The gasification furnace thermocouple includes a thermocouple and a thermocouple protective sleeve which is arranged on the thermocouple. The thermocouple protective sleeve comprises a nonmetal protective tube of which one end is closed, an outer metal protective tube which is wrapped on the outer side surface of the nonmetal protective tube, and an inner metal protective tube of which one end is closed, wherein the inner metal protective tube extends into the nonmetal protective tube; the outer surface of the inner metal protective tube is provided with a molten aluminum composite layer; a second adhesive layer is arranged between the inner metal protective tube and the nonmetal protective tube; a first adhesive layer is arranged between the nonmetal protective tube and the outer metal protective tube; the outer surface of the outer metal protective tube is provided with a protective layer; submicron silicon carbide powder is sintered in a pressureless manner so as to form the nonmetal protective tube; and the metal inner protective tube and the metal outer protective tube are formed by smelting alloys. The gasification furnace thermocouple of the utility model has the advantages of excellent high temperature resistance, high pressure resistance, high temperature slag corrosion resistance, high temperature slag washout resistance, oxidizing gas resistance, educing gas resistance and prolonged service life.
Description
Technical field
The utility model relates to a kind of thermopair, relates in particular to the reduction of a kind of resistance to high temperature oxidation, resistance to lime-ash washes away and the gasification oven thermocouple of refractory slag corrosion.
Background technology
In the industrial processes such as oil, chemical industry, particularly Coal Chemical Industry industry coal liquefaction, coal gas industry development period rapidly, the application of gasification furnace is more and more extensive.Gasification furnace is also in Large Fertilizer engineering, to produce the key equipment of synthetic ammonia, and heavy oil cracking and gasifying stove is also to take heavy oil to produce the key equipment of syngas for synthetic ammonia as raw material.Heavy oil cracking and gasifying stove working pressure is 2.5～8.5Mpa, and working temperature is 1350 ℃～1500 ℃, the oxygen and the high pressure steam that in stove, in medium composition, contain high concentration, and in stove, normal condition belongs to oxidation---reducing gas alternately.The pulverized coal gasification furnace that particularly pressurizes is to take coal water mixture to produce the key equipment of the gas raw material of synthetic ammonia as starting material, and gasification furnace firing chamber is high temperature, high pressure not only, and contains multiple complicated flame gas operating mode.1450 ℃～1600 ℃ of firing chamber working temperatures, working pressure is 2.5～6.5Mpa.Coal ash fusion temperature is between 1310～1370 ℃.Due to furnace gas oxidation---the synergy such as working temperature, the lime-ash of reducing action, superelevation wash away, slag corrosion, working environment is harsher.Noble-metal thermocouple is the important temperature measuring equipment of gasification furnace; the impact that current thermocouple protective casing is subject to working environment is very easily at short notice by heavy corrosion, worn out and produce cracking or fracture; be generally 15 days serviceable life～3 months; not regularly; need often to change, so production cost is very high.This problem does not have to be well solved up till now all the time.
Summary of the invention
The utility model mainly solves original thermopair and very easily by heavy corrosion, worn out generation, is ftractureed or fracture at short notice because thermocouple protective casing is subject to the impact of working environment, and serviceable life is shorter, need to often change the technical matters that production cost is higher; A kind of gasification oven thermocouple is provided; its thermocouple protective casing is high temperature resistant, high pressure resistant; both oxidative resistance gas; reducing resistance gas again; both high temperature resistance slag corrosion; again can coking; there is good thermal shock resistance; when furnace temperature surging, do not ftracture, do not rupture; under high temperature, high pressure, there are enough strong physical strength and high temperature resistant slag scouring capability; therefore greatly extended the serviceable life of thermocouple protective casing and gasification oven thermocouple, reduced replacement frequency, thereby reduce production costs.
Another object of the utility model is to provide a kind of gasification oven thermocouple; it is both flexible adjustable; there is again good leak stopping function; in the situation that operating mode is severe especially; even if there is cracking or fracture in production period thermocouple protective casing; measured medium can be toward equipment external leakage yet, reaches the double effects of not only antidetonation but also leak stopping, and security performance is high.
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals: the utility model comprises thermopair and is enclosed within the thermocouple protective casing outside thermopair; described thermocouple protective casing comprises the nonmetal protection tube of one end sealing and is enclosed in the metal outside protective pipe of nonmetal protection tube lateral surface; between nonmetal protection tube and metal outside protective pipe, be provided with the first tack coat, the outside surface of described metal outside protective pipe is provided with layer protective layer.Thermocouple protective casing consists of multilayer, by layering, is made.During thermometric, nonmetal protection tube directly contacts with gasification furnace medium, can under high temperature, high pressure, reliably use, and hardness is high.But nonmetal protection tube is not metal material after all, and length is longer, its creep resistant and anti-stress crack are just poorer, cannot weld easily with metal material again.Therefore, at the lateral surface of nonmetal protection tube, be enclosed with one section of metal outside protective pipe, thereby strengthen creep resistant and anti-stress crack, be also convenient to weld with metal material, be convenient to install.Between nonmetal protection tube and metal outside protective pipe, with high-temperature agglomerant, bond; when 1500 ℃ of left and right; metal outside protective pipe and high-temperature agglomerant can form combined state, further improve intensity and creep resistant and the anti-stress crack of thermocouple protective casing.The setting of protective seam, improves metal oxidation resistance and resistance to reduction energy.Therefore, thermocouple protective casing of the present utility model, high temperature resistant, high pressure resistant; both oxidative resistance gas; reducing resistance gas again, both high temperature resistance slag corrosion, again can coking; there is good thermal shock resistance; when furnace temperature surging, do not ftracture, do not rupture, under high temperature, high pressure, have enough strong physical strength and high temperature resistant slag scouring capability, greatly extended the serviceable life of thermocouple protective casing and gasification oven thermocouple; reduce replacement frequency, thereby reduce user's production cost.
As preferably, the open end of the top of described metal outside protective pipe and described nonmetal protection tube flushes, and the length of metal outside protective pipe is greater than the length of 1/2nd nonmetal protection tube.Metal outside protective pipe wraps up the whole lateral surface of nonmetal protection tube substantially; metal outside protective pipe contacts with gasification furnace hearth portion time-sharing environment; nonmetal protection tube only comprises a bit of exposed outside metal outside protective pipe of blind end; directly contact with needing the medium of thermometric in gasification furnace, guarantee the accuracy of thermometric.
As preferably, described nonmetal protection tube adopts the pressureless sintering of submicron silicon carbide powder to form, described metal outside protective pipe adopts alloy smelting to form, described alloy comprises that weight ratio is 65%～70% chromium, 5%～7% molybdenum, 2%～4% niobium, 1%～2% yttrium and remaining iron, the first described tack coat adopts the silicon nitride powder that weight ratio is 45%～55%, the hybrid adhesive that 25%～35% mica and remaining water and viscose glue are made, described protective seam is one deck alchlor that is coated in the outside surface of metal outside protective pipe, molybdenum, cobalt, the mixed molten liquid layer of tweezer and iron, the outside of this mixed molten liquid layer is also provided with one deck through the ceramic layer of the compound modification of laser remolten.Carbofrax material hardness is high, to be only second to one of the hardest adamantine material, under room temperature, the hardness of silit is 2800Kg/mm2, also can in 1900 ℃ of high temperature, use reliably, actual use up in the environment temperature of 1650 ℃, has intensity and creep resistant and the anti-stress crack of superelevation in gasification furnace.Bending strength (4 point) 380Mpa, fracture toughness 4.6Mpa/ √ m, elastic modulus (room temperature) 410Gpa.Suitable with the thermal conductivity of stainless steel material, thermal conductivity is 5 times of aluminium oxide, and proportion is half of most metals alloy, is 40% of steel, roughly the same with aluminium.The nonmetal protection tube that adopts the pressureless sintering of submicron silicon carbide powder to make, has the intensity of high rigidity and superelevation, and high temperature resistant, high pressure resistant, creep resistant and anti-stress crack are strong.Protective seam also can only be located at the surface of the high temperature section of metal outside protective pipe, corrosion-resistant, anti abrasive performance that protective seam has, anti-oxidant, the resistance to reduction energy of raising thermocouple protective casing.
As preferably, in described nonmetal protection tube, be provided with the interior protection tube of metal of one end sealing, in metal, the outside surface of protection tube is provided with aluminum melt composite bed, in metal, between protection tube and nonmetal protection tube, is provided with the second tack coat.In metal, protection tube is generally made with refractory metal; high temperature resistant, corrosion-resistant; in metal, protection tube is as the skeleton in nonmetal protection tube; by aluminum melt heat, be applied to protection tube outside surface in metal; with laser remolten, form aluminum melt composite bed again, in metal, the endoporus of protection tube and nonmetal protection tube is bonding with high-temperature agglomerant.Make nonmetal protection tube have resistant to elevated temperatures metal outside protective pipe protection outward; inside there is protection tube in resistant to elevated temperatures metal to support as skeleton; therefore; even if there is cracking or fracture in nonmetal protection tube within a certain period of time; harmful gas in gasification furnace medium also cannot directly corrode the thermopair of being made by noble metal platinum-rhodium wire, does not affect thermopair and proceeds thermometric work.
As preferably; in described metal, protection tube adopts tantalum that weight ratio is 18%～22%, 55%～62% tungsten, 11%～13% niobium and 5%～7% molybdenum to smelt the alloy material forming, the hybrid adhesive that the second described tack coat adopts silicon nitride powder that weight ratio is 45%～55%, 25%～35% mica and remaining water and viscose glue to make.Tantalum, tungsten, niobium and molybdenum are refractory metal; high temperature resistant, corrosion-resistant; the resistance to 1700 ℃ of high temperature of hybrid adhesive of silicon nitride powder and mica; when 1500 ℃ of left and right; in metal, protection tube and high-temperature agglomerant can form combined state, further improve intensity and creep resistant and the anti-stress crack of thermocouple protective casing.
As preferably; the closed end overcoat of described nonmetal protection tube has a graphite bush; the sealing of graphite bush one end, the other end are opened; its open end is provided with internal thread; the bottom of described metal outside protective pipe is provided with the external thread with described internal thread coupling, and described graphite bush is connected by screw thread with the bottom of metal outside protective pipe.Graphite bush easy accessibility.While not working, graphite bush overlaps in the above, while needing thermometric, then is pulled down.Prevent from meeting accident in the situations such as transportation, installation, baker, operation and hurt nonmetal protection tube, graphite bush plays a very good protection to the exposed termination of nonmetal protection tube.
As preferably, on described metal outside protective pipe, be connected with equipment mounting flange, equipment mounting flange is provided with cutting ferrule holder and movable cutting ferrule, cutting ferrule holder is provided with external thread, the endoporus top of cutting ferrule holder is provided with a circle shoulder, shoulder is provided with O-ring seal, in described movable cutting ferrule, be provided with connected large through-hole and small through hole, the junction of large through-hole and small through hole forms a circle and presses down shoulder, large through-hole is provided with internal thread, large through-hole and cutting ferrule holder match, described movable cutting ferrule is connected by screw thread with cutting ferrule holder, described pressing down on the end face that shoulder is pressed in described cutting ferrule holder and O-ring seal, the top of described metal outside protective pipe is connected with lower flange, is connected with upper flange on lower flange, is provided with metal and is wound around Graphite pad between upper flange and lower flange.
The beneficial effects of the utility model are: have the premium properties that high temperature resistant, high pressure resistant, high temperature resistant melt slag corrosion and high temperature resistant slag wash away; both oxidative resistance gas; reducing resistance gas again; there is good thermal shock resistance; when furnace temperature surging, do not ftracture, do not rupture; under high temperature, high pressure, there is enough strong physical strength; therefore greatly extended the serviceable life of thermocouple protective casing and gasification oven thermocouple; reach serviceable life more than 1 year; thereby minimizing replacement frequency, reduces user's production cost.In addition, the utility model is both flexible adjustable, has again good leak stopping function; in the situation that operating mode is severe especially, even if cracking or fracture occur production period thermocouple protective casing, measured medium can be toward equipment external leakage yet; the double effects that reaches not only antidetonation but also leak stopping, improves security performance.
Accompanying drawing explanation
Fig. 1 is a kind of axial sectional structure schematic diagram of the present utility model.
Fig. 2 is the enlarged diagram of a kind of localized axial sectional structure of thermocouple protective casing in the utility model.
Fig. 3 is a kind of stereo decomposing structural representation of cutting ferrule holder, O-ring seal and movable cutting ferrule in the utility model.
1. thermopairs in figure, 2. nonmetal protection tube, 3. metal outside protective pipe, 4. the first tack coat; 5. protective seam, 6. protection tube, 7. the second tack coat, 8. graphite bush in metal; 9. equipment mounting flange, 10. cutting ferrule holder, 11. movable cutting ferrules; 12. shoulders, 13. O-ring seals, 14. large through-holes; 15. small through hole, 16. press down shoulder, 17. lower flanges; 18. upper flanges, 19. metals are wound around Graphite pad, 20. terminal boxes.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of gasification oven thermocouple of the present embodiment, as shown in Figure 1, comprises the thermopair 1 being connected with terminal box 20 and be enclosed within the thermocouple protective casing outside thermopair 1.Thermocouple protective casing comprises nonmetal protection tube 2, the interior protection tube 6 of the metal of one end sealing of one end sealing and is enclosed in the metal outside protective pipe 3 of nonmetal protection tube lateral surface.As shown in Figure 2, nonmetal protection tube 2 adopts the pressureless sintering of submicron silicon carbide powder to form, in metal, protection tube 6 is inserted in the endoporus of nonmetal protection tube 2, in metal, protection tube 6 adopts the tantalum that weight ratio is 20%, 60% tungsten, 13% niobium and 7% molybdenum form through alloy smelting, in metal, the outer surface heat of protection tube 6 scribbles one deck aluminum melt, through laser remolten, form one deck aluminum melt composite bed again, the silicon nitride powder that is 50% by weight ratio between protection tube 6 and the endoporus of nonmetal protection tube 2 in metal, the hybrid adhesive that 30% mica and remaining water and viscose glue are made bonds, form the second tack coat 7.The open end of the top of metal outside protective pipe 3 and nonmetal protection tube 2 flushes, the length of metal outside protective pipe 3 is slightly less than the length of nonmetal protection tube 2, make nonmetal protection tube only comprise a bit of exposed outside metal outside protective pipe of blind end, metal outside protective pipe 3 adopts alloy smelting to form, this alloy comprises that weight ratio is 70% chromium, 5% molybdenum, 3% niobium, 2% yttrium and remaining iron, the silicon nitride powder that is 50% by weight ratio between the endoporus of the lateral surface of nonmetal protection tube 2 and metal outside protective pipe 3, the hybrid adhesive that 30% mica and remaining water and viscose glue are made bonds, form the first tack coat 4, the outside surface of metal outside protective pipe 3 also has layer protective layer 5, this protective seam 5 is for being coated in one deck alchlor of the outside surface of metal outside protective pipe 3, molybdenum, cobalt, the mixed molten liquid layer of tweezer and iron, the outside of this mixed molten liquid layer also has one deck through the ceramic layer of the compound modification of laser remolten.As shown in Figure 1; in the exposed part outside metal outside protective pipe of nonmetal protection tube 2, cover has a graphite bush 8; graphite bush 8 one end sealings, the other end are opened; its open end has internal thread; there is the external thread matching the bottom of metal outside protective pipe 3, and graphite bush 8 is connected by screw thread with the bottom of metal outside protective pipe 3.On metal outside protective pipe 3, be connected with equipment mounting flange 9; on the end face of equipment mounting flange 9, be welded with a cutting ferrule holder 10, as shown in Figure 3, cutting ferrule holder 10 has external thread; there is a circle shoulder 12 on the endoporus top of cutting ferrule holder 10, and an O-ring seal 13 is installed on shoulder 12.A movable cutting ferrule 11 has been threaded on cutting ferrule holder 10, in movable cutting ferrule 11, there are connected large through-hole 14 and small through hole 15, large through-hole 14 and small through hole 15 junction form a circle and press down shoulder 16, large through-hole 14 has internal thread, large through-hole 14 and cutting ferrule holder 10 match, realize and being threaded of cutting ferrule holder, press down on the end face that shoulder 16 is pressed in cutting ferrule holder 10 and O-ring seal 13.The top of metal outside protective pipe 3 is welded with lower flange 17, is connected with upper flange 18 on lower flange 17, is lined with metal and is wound around Graphite pad 19 between upper flange 18 and lower flange 17.
The manufacturing process of the present embodiment is as follows:
1.. with submicron silicon carbide powder, through pressureless sintering, make nonmetal protection tube 2;
2.. alloy protection tube 6 in alloy smelting is made metal that the tantalum that is 20% by weight ratio, 60% tungsten, 13% niobium and 7% molybdenum form;
3.. by aluminum melt heat, be coated in the outside surface of protection tube 6 in metal, then use laser remolten compound, make aluminum melt composite bed;
4.. protection tube in metal 6 is inserted in nonmetal protection tube 2, and the cementing agent bonding made of the silicon nitride powder that is 50% by weight ratio between the two, 30% mica and remaining water and viscose glue;
5.. the alloy that the chromium that is 70% by weight ratio, 5% molybdenum, 3% niobium, 2% yttrium and remaining iron form is made metal outside protective pipe 3 through alloy smelting;
6.. metal outside protective pipe 3 is enclosed within outside nonmetal protection tube 2, make nonmetal protection tube only comprise a bit of outside exposed of blind end, the cementing agent bonding that the silicon nitride powder that is 50% by weight ratio, 30% mica and remaining water and viscose glue are made between the two;
7.. in the first coat weight of the outside surface of metal outside protective pipe 3, than being 80% alchlor, 7% molybdenum, 5% cobalt, 3% tweezer and the mixed molten liquid of remaining iron, then through the ceramic layer of the compound upper modification of laser remolten, make protective seam 5;
8.. the naked section at nonmetal protection tube 2 puts the sealing of Yi Ge one end, the open graphite bush 8 of the other end outward, is threaded connection graphite bush 8 is tightened on the bottom of metal outside protective pipe 3.
Claims (6)
1. a gasification oven thermocouple; comprise thermopair (1) and be enclosed within the outer thermocouple protective casing of thermopair (1); thermocouple protective casing described in it is characterized in that comprises the nonmetal protection tube (2) of one end sealing and is enclosed in the metal outside protective pipe (3) of nonmetal protection tube lateral surface; between nonmetal protection tube (2) and metal outside protective pipe (3), be provided with the first tack coat (4), the outside surface of described metal outside protective pipe (3) is provided with layer protective layer (5).
2. a kind of gasification oven thermocouple according to claim 1; it is characterized in that the top of described metal outside protective pipe (3) and the open end of described nonmetal protection tube (2) flush, the length of metal outside protective pipe (3) is greater than the length of 1/2nd nonmetal protection tube (2).
3. a kind of gasification oven thermocouple according to claim 1 and 2; it is characterized in that described nonmetal protection tube (2) adopts the pressureless sintering of submicron silicon carbide powder to form, the outside of described protective seam (5) is also provided with one deck through the ceramic layer of the compound modification of laser remolten.
4. a kind of gasification oven thermocouple according to claim 1; it is characterized in that being provided with in described nonmetal protection tube (2) the interior protection tube (6) of metal of one end sealing; in metal, the outside surface of protection tube (6) is provided with aluminum melt composite bed, in metal, between protection tube (6) and nonmetal protection tube (2), is provided with the second tack coat (7).
5. according to a kind of gasification oven thermocouple described in claim 1 or 2 or 4; the closed end overcoat that it is characterized in that described nonmetal protection tube (2) has a graphite bush (8); the sealing of graphite bush (8) one end, the other end are opened; its open end is provided with internal thread; the bottom of described metal outside protective pipe (3) is provided with the external thread with described internal thread coupling, and described graphite bush (8) is connected by screw thread with the bottom of metal outside protective pipe (3).
6. according to a kind of gasification oven thermocouple described in claim 1 or 2 or 4, it is characterized in that being connected with equipment mounting flange (9) on described metal outside protective pipe (3), equipment mounting flange (9) is provided with cutting ferrule holder (10) and movable cutting ferrule (11), cutting ferrule holder (10) is provided with external thread, the endoporus top of cutting ferrule holder (10) is provided with a circle shoulder (12), shoulder (12) is provided with O-ring seal (13), in described movable cutting ferrule (11), be provided with connected large through-hole (14) and small through hole (15), the junction of large through-hole (14) and small through hole (15) forms a circle and presses down shoulder (16), large through-hole (14) is provided with internal thread, large through-hole (14) and cutting ferrule holder (10) match, described movable cutting ferrule (11) is connected by screw thread with cutting ferrule holder (10), described pressing down on the end face that shoulder (16) is pressed in described cutting ferrule holder (10) and O-ring seal (13), the top of described metal outside protective pipe (3) is connected with lower flange (17), is connected with upper flange (18) on lower flange (17), is provided with metal and is wound around Graphite pad (19) between upper flange (18) and lower flange (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320378630.3U CN203396502U (en) | 2013-06-27 | 2013-06-27 | Gasification furnace thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320378630.3U CN203396502U (en) | 2013-06-27 | 2013-06-27 | Gasification furnace thermocouple |
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| CN203396502U true CN203396502U (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320378630.3U Expired - Lifetime CN203396502U (en) | 2013-06-27 | 2013-06-27 | Gasification furnace thermocouple |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630256A (en) * | 2013-06-27 | 2014-03-12 | 杭州亿泰自控设备有限公司 | Gasification furnace thermocouple and preparation method of thermocouple protection sleeve |
| CN105092066A (en) * | 2015-09-14 | 2015-11-25 | 沈阳飞机工业（集团）有限公司 | Split salt bath furnace thermocouple protection tube and use method |
-
2013
- 2013-06-27 CN CN201320378630.3U patent/CN203396502U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630256A (en) * | 2013-06-27 | 2014-03-12 | 杭州亿泰自控设备有限公司 | Gasification furnace thermocouple and preparation method of thermocouple protection sleeve |
| CN103630256B (en) * | 2013-06-27 | 2015-11-18 | 杭州亿泰自控设备有限公司 | The method for making of gasification oven thermocouple and thermocouple protective casing thereof |
| CN105092066A (en) * | 2015-09-14 | 2015-11-25 | 沈阳飞机工业（集团）有限公司 | Split salt bath furnace thermocouple protection tube and use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Fuyang the Fuchun River instrument factory of Hangzhou Assignor: Hangzhou Yitai Automatic Control Equipment Co.,Ltd. Contract record no.: 2017330000030 Denomination of utility model: A kind of gasification oven thermocouple Granted publication date: 20140115 License type: Common License Record date: 20170331 |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140115 |