CN202915354U - Recrystallization silicon carbide boiler burner - Google Patents
Recrystallization silicon carbide boiler burner Download PDFInfo
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- CN202915354U CN202915354U CN 201220402621 CN201220402621U CN202915354U CN 202915354 U CN202915354 U CN 202915354U CN 201220402621 CN201220402621 CN 201220402621 CN 201220402621 U CN201220402621 U CN 201220402621U CN 202915354 U CN202915354 U CN 202915354U
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Abstract
The utility model relates to a recrystallization silicon carbide boiler burner which comprises a metal support piece and a thermal-abrasion-resisting part. The thermal-abrasion-resisting part is a recrystallization silicon carbide ceramic part formed by silicon carbide micro powder and rare earth yttrium additives and the like by pulping, casting molding and sintering at 2,450-2,550 DEG C. The recrystallization silicon carbide burner is good in erosive wear resistance and heat resistance, enables coal dust flow sprayed out to be always kept in a most ideal state of original design, greatly improves burning efficiency, is suitable for thermal-abrasion-resisting operation under various poor working conditions, prolongs service life of a boiler, and is of great significance for improving production efficiency of enterprises, saving energy, guaranteeing production safety, improving working environments and greatly reducing maintenance cost.
Description
Technical field
The utility model relates to a kind of boiler-burner, is specifically related to a kind of recrystallized silicon carbide boiler-burner.
Background technology
At present domestic electricity generation boiler burner more than 200,000 kilowatts, all adopt coal dust localized concentrations technology, parallel flow burner adopts the shutter enrichment facility more, vortex burner adopts coning tower tray body enrichment facility more, localized concentrations can strengthen that breeze airflow catches fire and combustion process, improves flammability and the efficiency of combustion of boiler; But the wearing and tearing of burner alloy part part have also been aggravated simultaneously; shortened the burner life-span; recondition expense and workload have not only greatly been increased; but also destructible stove internal combustion operating mode; make the easy coking of water-cooling wall and high temperature corrosion, coal dust firing is not thorough, increases the combustion-supporting number of times of fuel oil; during serious wear even cause unexpected truce, affect the safe operation of electrical network.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of compact structure, heat and corrosion resisting can be good, long service life, recrystallized silicon carbide boiler-burner that the operation maintenance expense is low.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
With the heat-resisting erosion part of recrystallized silicon carbide ceramic member as boiler-burner, and be provided with the support member corresponding with each heat-resisting erosion part, its metal material by certain high-temperature capability is made.
Above-mentioned recrystallized silicon carbide ceramic member can be by following raw material through slurrying, moulding by casting, 2450～2550 ℃ of recrystallized silicon carbide ceramic members that lower sintering forms: purity 〉=99.5%, granularity are silicon carbide micro-powder 92～94wt%, the rare-earth yttrium auxiliary agent 6～8wt% of 0～150um;
In described silicon carbide micro-powder, granularity is that account for 25～35 wt%, granularity of 0～1um are that the account for 15～25wt%, granularity of 1～5um is that to account for 15～25wt%, granularity be that the silicon carbide micro-powder of 125～150um accounts for 25～35wt% for the silicon carbide micro-powder of 10～63um.Adopt micro mist granularity and auxiliary agent proportioning, the large-scale workpiece ratio of briquetting is brought up to more than 95%.
The acute angle shape particle accounts for 28～35wt% in the described silicon carbide micro-powder, and obtuse angle shape particle accounts for 65～72wt%.Adjust the shape of silicon carbide micro-powder particle, can further improve the ability of opposing angle of site erosion, make it reach requirement wear-resistant under high wind speed, the hot conditions, anti-ablation.
Described heat-resisting erosion part comprises elbow, ceramic pillar, ceramic condensation means, wear-resistance protective sleeve in the ceramic wear-resisting; Described metallic supports comprises that elbow, heat resisting pipe, installation prop up part, described ceramic wear-resisting bend is installed in matchingly described inner side of elbow and forms composite elbow, this composite elbow is sleeved on described heat resisting pipe one end, the end that part is installed in this heat resisting pipe is propped up in described installation, described ceramic pillar, ceramic condensation means are sleeved on the middle part of described heat resisting pipe successively, and elbow overlaps matchingly in described ceramic pillar and the ceramic wear-resisting; Described wear-resistance protective sleeve is sleeved on matchingly described installation and props up on the part.
Described metallic supports comprises circumference head, heat-resisting steel cylinder, the heat resisting steel spout that connects successively; Described heat-resisting erosion part comprises a circumference ceramic-lined body, ceramic-lined body, the ceramic wear-resisting spout that is installed on accordingly successively described metallic supports inboard and is installed in ceramic blinds in the described ceramic-lined body.
When the width of described heat-resisting erosion part or external diameter surpass sintering furnace chamber internal diameter or/and its length when surpassing sintering furnace chamber height, then by resolving into bulk-breaking that several or a few part the make corresponding heat-resisting erosion part that is spliced successively.
Above-mentioned recrystallized silicon carbide boiler-burner can be made by following method:
(1) prepares metallic supports according to the dimensions of design, decompose each heat-resisting erosion parts of design, produce the original mold of each Knock-Down Component; Manufacture process requirement according to the recrystallized silicon carbide material, former designed combustion device is decomposed manufacturing, and then assembling, can guarantee that the former design shape of burner is constant, combustibility is constant, and wear-resistant, ablation resistance under the high wind speed, hot conditions improve significantly; Burner is subject to position that coal dust washes away all should be with recrystallized silicon carbide parts covering protection, and the Standard General that parts decompose is no more than the sintering furnace in-core with the parts external diameter and directly is as the criterion, but integral manufacturing is made otherwise should resolve into several or a few part; The high and low size of parts is convenient to shove charge with idiosome and is fired and be advisable.
(2) produce corresponding plaster mold according to the original mold of each Knock-Down Component;
(3) choose the raw material of making recrystallization carbon ceramics spare according to said ratio, behind the batch mixing, adding water to phosphoric acid is 500～600 pools, and Vacuum Mixture is 20～30 hours again; After slip is mixed, pour into a mould with plaster mold on casting platform, the green compact that casting is good are placed the demoulding after 2～3 hours; Again with the green compact after demoulding oven dry, behind the dimensioned repaired biscuit by described requirement, dry again to moisture below 2%; Green compact are set high carry out sintering in the warm vacuum drying oven, heating rate with 3～5 ℃/minute under vacuum state heats up, when temperature rises to 1100 ℃, being filled with inert gas makes furnace pressure reach 1.5～2.5MPa, continuation is warming up to 2450～2550 ℃ with 2 ℃/minute heating rate, then be incubated 1.5～2.5 hours, naturally cooling is come out of the stove when temperature is down to below 150 ℃ and is got the recrystallized silicon carbide ceramic member again;
(4) the recrystallized silicon carbide ceramic member of making is docked assembling with described metallic supports, tight or/and high temperature adhesive is bonding with the high-temperature fibre padding with the position that the recrystallized silicon carbide ceramic member is combined in metallic supports.Adopt the method for this kind soft combination, solved recrystallized silicon carbide ceramic component and iron and steel support member and met the inconsistent and technical barrier that is difficult to combination that causes of thermal coefficient of expansion.Filling gap between recrystallized silicon carbide ceramic member and the support member can calculate with conventional method according to the thermal coefficient of expansion of these parts position of living in operating temperature, each parts.
In described step (3), the vacuum when Vacuum Mixture and vacuum heat up is 2～5mPa.
Described inert gas is at least a in argon gas, helium, the neon.
Described high-temperature fibre is high aluminum fiber, pyroceram fibre SiC(Al), at least a in the PBI fiber.
Described high temperature adhesive is at least a in phosphalugel adhesive, organic silicon adhesive, the polyimides adhesive.
The utlity model has actively useful effect:
1. the utility model recrystallized silicon carbide burner (single flow and spiral-flow type power station boiler burner) resistance to erosion polishing machine, heat resistance significantly improve, can make the breeze airflow of ejection maintain all the time intrinsic perfect condition, greatly improved efficiency of combustion, to prolonged boiler service life, energy-saving and cost-reducing, reduce discharging significant.Following table 1 is the contrast in 600,000 kilowatts of steel alloy burners and recrystallized silicon carbide burner service life:
The cost performance of table 1 the utility model burner and normal burner
| Title | Price (ten thousand yuan) | Service life |
| The utility model product (individual) | 8 | More than 5 years |
| Alloy steel product (individual) | 8 | 1 year |
(2) use every of the utility model product can save hundreds thousand of first maintenance costs, with more than 400 power plant in the whole nation, minimum more than 20,000 burner meters, if all adopt the utility model product, billions of units of can reducing expenses.
(3) the utility model product component major part can adopt socket and screw to fix, and the welding technique of comparison original product has advantages of that easy disassembly is convenient to keep in repair.
(4) the utility model product has improved security and the economy of station boiler, has safeguarded the safe operation of electrical network.
(5) the utility model product can effectively reduce the working site dust leakage, improves working environment, improves operator's general level of the health.
(6) the utility model product processes is ripe, and properties of product are good, filled up domestic and international blank, have good economic and social benefit.
Description of drawings
Fig. 1 is a kind of structural representation of recrystallized silicon carbide boiler-burner;
Fig. 2 is the structural representation of another kind of recrystallized silicon carbide boiler-burner.
Among the figure, 1 is the circumference head, and 2 is ceramic-lined body, 3 is heat-resisting steel cylinder, and 4 is the heat resisting steel spout, and 5 is the ceramic wear-resisting spout, 6 ceramic blinds, 7 are a circumference ceramic-lined body, 8 is elbow, 9 is elbow in the ceramic wear-resisting, 10,11 is ceramic pillar, and 12 is heat resisting pipe, and 13 is ceramic condensation means, 14 for installing a part, and 15 is wear-resistance protective sleeve.
The specific embodiment
Used raw material and utensil etc. if no special instructions, are commercially available among the following embodiment; Method therefor is conventional method if no special instructions.
1 one kinds of recrystallized silicon carbide power station boiler burners of embodiment referring to Fig. 1, comprise the heat-resisting erosion part at each position and corresponding metallic supports, and described metallic supports comprises the circumference that connects successively 1, heat-resisting steel cylinder 3, heat resisting steel spout 4; Described heat-resisting erosion part comprises a circumference ceramic-lined body 7, ceramic-lined body 2, the ceramic wear-resisting spout 5 that is installed on accordingly successively described metallic supports inboard and is installed in the ceramic blinds 6 of the some of arranging by certain way in the described ceramic-lined body.
The preparation method of said burner is as follows:
(1) decomposes designed combustion device part diagram according to model burner original product drawing of the same race by the recrystallized silicon carbide production technology, namely design respectively the heat-resisting erosion part at each position and the element size figure of corresponding metallic supports.
(2) prepare metallic supports corresponding to each position according to designed element size figure of upper step.
(3) the element size figure according to each the heat-resisting erosion part in the step (1) makes original mold, makes plaster cast with original mold again.
(4) make each heat-resisting erosion part:
(I) selects materials: will want to buy material according to prescription, the granularity of every kind of material and shape will be evenly distributed, and have not allowed too high or too low phenomenon.
(II) ingredient inspection: silicon carbide micro-powder performance requirement: SiC:99.9; FC:0.01; SiO
2: 0.03; AL
2O
3:0.02.Naturally pile close 1.55/cm
3, screening coarse fodder 150um, 90% screen rate.
After (III) ingredient inspection is qualified, carries out a small amount of batching, mix, pour into a mould in laboratory, require simultaneously phosphoric acid to reach to 500～600Pa, density 2.60～2.65g/cm
3, require slip that good suspension must be arranged, avoid the slip precipitation, generate waste product.
(IV) batch mixing: press prescription weighing silicon carbide micro-powder: 30 parts in the material of granularity 0-1um; 20 parts in the material of granularity 1-5um; 20 parts in the material of granularity 10-63um; 30 parts in the material of granularity 125-150um; 8 parts of rare-earth yttrium auxiliary agents.
Elder generation's mixing portion silicon carbide micro-powder, batch mixing limit, limit Jia Shui is divided into 5 times micro mist is finished, and adds rare-earth additive again; After raw material is thrown in and finished, extracting the air of batch mixer out with vavuum pump, is under the 2Pa state in vacuum, batch mixing 20 hours, and adding water move at last phosphoric acid is 500 pools.
(V) cast: after slip was mixed, on teeming stage, with the plaster mold cast, suction time was definite according to wall thickness, and the heavy wall time is long, and the thin-walled time is short, will pour into a mould good semi-finished product green compact again and place the demoulding after 2 hours.
The slip that has more behind the blowing returns batch mixer and continues batch mixing, adds in right amount water according to phosphoric acid, reaches to prepare against cast next time after viscosity requires.
(VI) green compact oven dry and trimming: the green compact after the demoulding are put into 100 ℃ drying chamber oven dry and were taken out afterwards in one day, then it are rebuild, reach the drawing dimensional requirement after, put into again drying chamber oven dry 2 days, moisture control is getting final product below 2%.
(VII) fired: frequently carry out in the electric furnace in a vacuum, base substrate supports with the graphite frame, heats up under vacuum state, and programming rate is 3 ℃/minute, vacuum is 5Pa, when temperature reaches 1100 ℃, be filled with the inert gas argon gas, it is 1.5MPa that the amount of being filled with makes furnace pressure, continue again to be warmed up to 2450 ℃, programming rate is 2 ℃/minute, is incubated after 2 hours power failure and naturally cools off, and comes out of the stove when temperature is down to 150 ℃.
After product is come out of the stove, pressure testing on Intensity of Breaking Tester, compression strength reach be considered as more than the 100MPa qualified.
(VIII) is installed in the recrystallized silicon carbide parts that bake on the iron support member of making, real with the high-temperature fibre plug between iron support member and the recrystallized silicon carbide ceramic member, its gap is just set with each section operating temperature, guarantee that workpiece firmly is not heated to burst again to be as the criterion.
Embodiment 2: the recrystallized silicon carbide power station boiler burner: referring to Fig. 2, comprise heat-resisting erosion part and the corresponding metallic supports at each position, its heat-resisting erosion part comprises elbow 9, ceramic pillar 10,11, ceramic condensation means 13, wear-resistance protective sleeve 15 in the ceramic wear-resisting; Described metallic supports comprises elbow 8, heat resisting pipe 12, a part 14 is installed, described ceramic wear-resisting bend 9 is installed in the elbow 8 inboard composite elbows that form matchingly, this composite elbow is sleeved on described heat resisting pipe 12 1 ends, install and prop up the end that part 14 is installed in this heat resisting pipe 12, pottery pillar 10,11, ceramic condensation means 13 are sleeved on the middle part of heat resisting pipe 12 successively, and ceramic pillar 10 overlaps matchingly with ceramic wear-resisting bend 9; Wear-resistance protective sleeve 15 is sleeved on matchingly to be installed on the part 14.
The recrystallization parts of above-mentioned boiler-burner and the preparation method of metal support are substantially substantially the same manner as Example 1, difference is: the burner bent tube section, because large (greater than 600mm) temperature not high (less than 150 ℃) of diameter, therefore adopt the way of using high-temp glue bonding (phosphalugel adhesive) between recrystallized silicon carbide bushing pipe (the recrystallized silicon carbide ceramic member after the decomposition) and the heat resisting pipe (support member) 12, all the other pillars, cone and front end steel alloy bracing frame and recrystallized silicon carbide parts (recrystallized silicon carbide ceramic member) joint portion all uses high-temperature fibre (high aluminum fiber) plug real, fixes with high temperature resistant screw simultaneously.
Above-mentioned recrystallized silicon carbide boiler-burner has been applied to 4 electricity generation boilers of Handan, Hebei province power plant in 2004, last so far 8 years, only has mild wear through check, and expectation can be used more than 10 years; In addition, prepare as stated above the utility model product and also be used for Nanyang Ya He power plant, many the power plant such as table mountain Yaomeng power plant, Datang Luoyang power plant, Datang Yuzhou power plant, last and all surpass 2 years, the assay proof is zero wearing and tearing substantially at present, greatly prolong service life, and significantly reduce frequency of maintenance and expense, the result of use highly significant.
Although, above with a general description of the specific embodiments the utility model having been done detailed description, on the utility model basis, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements on the basis of not departing from the utility model spirit all belong to the claimed scope of the utility model.
Claims (2)
1. recrystallized silicon carbide boiler-burner, comprise heat-resisting erosion part and corresponding metallic supports, it is characterized in that, described heat-resisting erosion part is the recrystallized silicon carbide ceramic member, and described heat-resisting erosion part comprises elbow, ceramic pillar, ceramic condensation means, wear-resistance protective sleeve in the ceramic wear-resisting; Described metallic supports comprises that elbow, heat resisting pipe, installation prop up part, described ceramic wear-resisting bend is installed in matchingly described inner side of elbow and forms composite elbow, this composite elbow is sleeved on described heat resisting pipe one end, the end that part is installed in this heat resisting pipe is propped up in described installation, described ceramic pillar, ceramic condensation means are sleeved on the middle part of described heat resisting pipe successively, and elbow overlaps matchingly in described ceramic pillar and the ceramic wear-resisting; Described wear-resistance protective sleeve is sleeved on matchingly described installation and props up on the part.
2. recrystallized silicon carbide boiler-burner according to claim 1 is characterized in that, described metallic supports comprises circumference head, heat-resisting steel cylinder, the heat resisting steel spout that connects successively; Described heat-resisting erosion part comprises a circumference ceramic-lined body, ceramic-lined body, the ceramic wear-resisting spout that is installed on accordingly successively described metallic supports inboard and is installed in ceramic blinds in the described ceramic-lined body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220402621 CN202915354U (en) | 2012-08-15 | 2012-08-15 | Recrystallization silicon carbide boiler burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220402621 CN202915354U (en) | 2012-08-15 | 2012-08-15 | Recrystallization silicon carbide boiler burner |
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| CN202915354U true CN202915354U (en) | 2013-05-01 |
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| CN 201220402621 Expired - Fee Related CN202915354U (en) | 2012-08-15 | 2012-08-15 | Recrystallization silicon carbide boiler burner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553620A (en) * | 2013-10-16 | 2014-02-05 | 沈阳星光技术陶瓷有限公司 | Manufacture method of recrystallized silicon carbide connecting fastener |
| CN111299547A (en) * | 2020-03-18 | 2020-06-19 | 安徽华德电力技术工程有限公司 | High-temperature-resistant composite material and preparation method and application thereof |
-
2012
- 2012-08-15 CN CN 201220402621 patent/CN202915354U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553620A (en) * | 2013-10-16 | 2014-02-05 | 沈阳星光技术陶瓷有限公司 | Manufacture method of recrystallized silicon carbide connecting fastener |
| CN111299547A (en) * | 2020-03-18 | 2020-06-19 | 安徽华德电力技术工程有限公司 | High-temperature-resistant composite material and preparation method and application thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20200815 |
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| CF01 | Termination of patent right due to non-payment of annual fee |