CN104402455A - Manufacturing method of sialon ceramic oil gas combustion tail gas treatment device - Google Patents
Manufacturing method of sialon ceramic oil gas combustion tail gas treatment device Download PDFInfo
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- CN104402455A CN104402455A CN201410595495.7A CN201410595495A CN104402455A CN 104402455 A CN104402455 A CN 104402455A CN 201410595495 A CN201410595495 A CN 201410595495A CN 104402455 A CN104402455 A CN 104402455A
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- sialon ceramic
- tail gas
- sialon
- combustion tail
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Abstract
The invention discloses a manufacturing method of a sialon ceramic oil gas combustion tail gas treatment device. According to the invention, fly ash is adopted as a raw material; an element molar ratio is adjusted so that O:Si:Al=1:1:1; sintering is carried out, such that sialon ceramic powder is obtained; a proper amount of tung oil is added for mixing; the mixture is processed by using a cold isostatic press, such that sialon ceramic blanks are obtained; sintering molding is carried out; and the obtained sialon ceramic parts are combined according to different demands and different sizes, such that the sialon ceramic oil gas combustion tail gas treatment device is obtained. The device has the characteristics of high thermal conductivity, good wear resistance, good corrosion resistance, high strength, low cost, capability of performing heat exchange over large temperature difference span, and the like. The device is suitable for heat energy equipment with oil and gas as energy sources, such as industrial kilns, smelting furnaces and power plants, and civil-use boilers, air conditioners, internal combustion engines, fishing boats, gas water heaters and the like. The device can also be used in vehicle exhaust tail gas treatment. The device has a wide application range.
Description
Technical field
The present invention relates to the manufacture method that oil gas combustion tail gas device administered by a kind of SiAlON ceramic, more particularly, relate to that a kind of thermal conductivity is strong, wear resistant corrosion resistant, intensity large, low cost, temperature difference span can carry out the manufacture method of the SiAlON ceramic improvement oil gas combustion tail gas device of the characteristics such as heat exchange greatly.
Background technology
Scientific research is analyzed and is shown, the pollutent that oil gas combustion tail gas discharges and used heat are one of main reason causing haze weather, the discharge of oil gas combustion tail gas simultaneously, also have heat with pollutant emission to abandon and need not, after oil gas burning and exhausting tail gas enters air, in original Oil/gas Fuels the gaseous state dry steam (H that formed in combustion in conjunction with oxygen (O) element in combustion air of hydrogeneous (H) element
2o) meet cold formation steam, and the particle suspensions in tail gas or air combines, and forms composite grain, after running into larger relative air humidity again, moisture absorption will occur very soon and increase, the particle diameter of particle can increase by 2 times to 3 times, optical extinction coefficient can increase by 8 times to 9 times, immediately haze weather occurs.More seriously, under strong solar ulatraviolet radiation, can there is photochemical reaction, produce a kind of organic compound excitatory in the hydrocarbon polymer that oil gas burning produces and nitrogen peroxide, its product is exactly the photo-chemical smog containing severe toxicity.
The end discharge flue-gas temperature of heat energy equipment exhaust gas processing device, the Schwellenwert 180 DEG C (other relevant industry standard or national standard are all higher than this value) that existing national standards GB/T17954-2007 " Industrial Boiler economical operation " and TSGG0002-2010 " boiler energy-saving technical supervision rule of management " specifies, some industry standard numerical value is higher, as: fuel-firing gas-firing generating set tail gas is up to 400 DEG C, although there is other technical reason, exhaust emissions temperature height is true.
Sialon is the compound word of Si, Al, O, N tetra-kinds of elements, and Chinese is called " Sai Long ", and as a kind of pottery, it is actually Si
3n
4middle Si, atom N the general name of a large class sosoloid that formed by Al and O atomic substitutions.The premium propertiess such as Sialon ceramic material has that thermostability is high, resistance of oxidation is strong and product size tolerance range is high; Because SiAlON ceramic is the covalent compound that key is high by force, and can oxide film be formed in atmosphere, so also have good chemical stability, less than 1200 DEG C not oxidized, 1200-1600 DEG C generate protective membrane can prevent further oxidation, and not by a variety of molten metals such as aluminium, lead, tin, silver, brass, nickel or alloy infiltrate or corrode; Sialon ceramic material can be used for the parts of high temperature engineering, the high grade refractory of the aspects such as metallurgical industry, anticorrosive parts and sealing element in chemical engineering industry, the cutter of Mechanical Processing Industry and cutlery etc.; SiAlON ceramic has high strength, resistant to elevated temperatures feature, and in stupalith, its comprehensive mechanical property, resistance to thermal shock performance, antioxidant property, abrasion resistance properties, corrosion resisting property are good, are one of preferred materials of heat engine parts pottery; In mechanical industry, SiAlON ceramic is used as bearing ball, roller, ball race, tool and mould, Advanced Ceramic Tool, pump plunger shaft match, axle sealing material etc.; At chemical industry, SiAlON ceramic is used as wear-resisting, corrosion-resistant member, as ball valve, the pump housing, combustion evaporators, strainer etc.; Controlling metal working industry, because SiAlON ceramic is high temperature resistant, frictional coefficient is little, there is self lubricity, most metal, alloy solution are stablized, therefore, the tool and mould of metal material processing can be made, as tube pulling plug, extruding, wire drawing mould, roll, transfer roller, heating element fixture, Thermal couple casing pipe, metal heat treatmet supporting member, crucible, aluminium fluid catheter, aluminium ladle-lining etc.; Sialon ceramic material is also widely used in photovoltaic, electronics, military affairs and nuclear industry.But the sialon material price that on market, purity is high is very high.
Flyash is a kind of artificial pozzolana mixed material, and be one of industrial residue that the current discharge capacity of China is larger, China present stage, bed drain purge year has reached 3,000 ten thousand tons.Along with the development of power industry, the flyash quantity discharged of coal-burning power plant increases year by year, and the disposal and utilization problem of flyash causes people to note widely.Because the ash quantity variation range of coal is very wide, and this change does not occur over just from all over the world or in the coal of areal different coal, even also occurs in the coal of same colliery distinct portions.Therefore, form the specific chemical composition content of flyash, also just different because of differences such as the place of production of coal, burning of coal mode and degree.Flyash can take certain technology method to be prepared into Sialon ceramic material.
Summary of the invention
The present invention aims to provide the manufacture method that oil gas combustion tail gas device administered by a kind of SiAlON ceramic, and the device produced has that thermal conductivity is strong, wear resistant corrosion resistant, intensity are large, low cost, temperature difference span can carry out the characteristics such as heat exchange greatly.
The manufacture method of oil gas combustion tail gas device administered by a kind of SiAlON ceramic provided by the invention, comprises the following steps:
(1) get powdered coal ash fully to mix in ball mill and the fine particle A being ground to below 1000 orders;
In described flyash, the massfraction of O, Si, Al tri-kinds of elements is: O:42.71% ~ 53.83%, Si:11.48% ~ 31.14%, Al:6.40% ~ 22.91%;
(2) get fine particle A and carry out components tests, obtain the massfraction of O, Si, Al tri-kinds of elements;
(3) add in silica flour, aluminium powder in the grinding raw material of above informed of quality mark one or both, make compound reach the requirement of mol ratio O:Si:Al=1:1:1, obtain compound B;
(4) compound B is put into nitriding furnace to sinter, nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 3.5 ± 0.5 hours, cooling is come out of the stove, and namely obtains Sai Long (sialon) ceramic powder;
(5) take Sai Long (sialon) ceramic powder weight, and be added into stirrer, during churning add tung oil gradually, the tung oil amount added is 5% of match grand (sialon) ceramic powder weight, obtains mixture C;
(6) mixture C after above stirring is inserted the cold isostatic press that mould is housed, the rate of rise controls at 100 tons/minute, until pressure reaches 1000 tons, and pressurize more than 30 minutes, then pressure release, the demoulding, obtain SiAlON ceramic base substrate; Base substrate is repaired and dries;
(7) base substrate after above finishing being dried is put into nitriding furnace and is sintered, and nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 8 ± 0.5 hours, cooling is come out of the stove, and obtains SiAlON ceramic part;
(8) according to different needs and size combination SiAlON ceramic part, obtain SiAlON ceramic and administer oil gas combustion tail gas device.During combination, between each assembly, gap place adopts the mixture of step (5) gained to fill.
SiAlON ceramic base substrate in the present invention can be different shape, and as square or circular tube shaped, lath-shaped, the intersection that can also be directly formed to as shown in Figure 1 is cellular.The shape of above-mentioned base substrate, according to different moulds, can obtain difform base substrate.
beneficial effect of the present invention:
The thermal hardwares such as the Industrial Stoves that SiAlON ceramic improvement oil gas combustion tail gas device is applicable to oil, gas is the energy, smelting furnace, power station and civil boiler, air-conditioning, oil engine, fishing boat, gas heater, and vehicular discharge treating tail gas, applied range.
This device can directly high temperature 1800 DEG C, to free air temperature+20 DEG C of (T=T
0+ 20 DEG C, T
0refer to outdoor ground temperature) continual enforcement thermal energy exchange in scope, exhaust temperature is dropped to below aqueous dew point temperature, the pollutent such as sulfide, nitride, fluorochemical in the water-soluble solidifying tail gas of condensation allowing the dry steam liquefaction in tail gas be formed, reduce the direct pollutant discharge amount of tail gas, realize energy-conserving and environment-protective object.
Accompanying drawing explanation
Fig. 1 is the sectional view of the embodiment of the present invention 1.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the structural representation of the embodiment of the present invention 2.
In figure, 1 is upper cover plate, and 2 is lower cover, and 3 is side plate, and 4 is SiAlON ceramic pipe, and 5 is weighting material; 6 is first surface, and 7 is second, 8 for heat exchange through hole one, 9 be heat exchange through hole two; In figure, A is airintake direction.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment 1:
First provide a kind of SiAlON ceramic to administer the manufacture method of oil gas combustion tail gas device, specifically comprise the following steps:
(1) get 1000kg powdered coal ash fully to mix in ball mill and the fine particle A being ground to below 1000 orders;
Elementary composition (massfraction) of described flyash is: O:47.83%, Si: 25.21%, Al:18.91%;
(2) get fine particle A and carry out components tests, obtain the massfraction of O, Si, Al tri-kinds of elements, the same;
(3) in the grinding raw material of above informed of quality mark, add 628kg aluminium powder, 584.9kg silica flour, make compound reach the requirement of mol ratio O:Si:Al=1:1:1, obtain compound B;
Basis is: the addition of silica flour: 1000*47.83%*28/16-1000*25.21%=584.9kg
The addition of aluminium powder: 1000*47.83%*27/16-1000*18.91%=618kg
(4) compound B is put into nitriding furnace to sinter, nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 3.5 ± 0.5 hours, cooling is come out of the stove, and namely obtains Sai Long (sialon) ceramic powder;
(5) take 1000kg weight match grand (sialon) ceramic powder, and be added into stirrer, during churning add tung oil gradually, the tung oil amount added is 5% of match grand (sialon) ceramic powder weight, and adding tung oil amount is 50kg weight, obtains mixture C;
(6) mixture C after above stirring is inserted the cold isostatic press that mould is housed, the rate of rise controls at 100 tons/minute, until pressure reaches 1000 tons, then pressure release, the demoulding, obtain SiAlON ceramic base substrate; Base substrate is repaired and dries;
(7) base substrate after above finishing being dried is put into nitriding furnace and is sintered, and nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 8 ± 0.5 hours, cooling is come out of the stove, and obtains SiAlON ceramic base substrate;
(8) according to different needs and size combination SiAlON ceramic base substrate, obtain SiAlON ceramic and administer oil gas combustion tail gas device.During combination, between each assembly, gap place adopts the mixture of step (5) gained to fill.
The present embodiment is chosen different moulds in cold isostatic press, is produced Sialon vitrified pipe, the Sialon ceramic plate of different structure, is then combined into the device that oil gas combustion tail gas administered by a kind of SiAlON ceramic:
The present embodiment obtains SiAlON ceramic pipe 10 by cold isostatic press, is of a size of: outer tube diameter is 12mm, and wall thickness is 3mm, and length is 650 mm, and hydraucone great circle diameter of section is 20mm, and hydraucone height is 8mm;
Three kinds of SiAlON ceramic plates are produced according to the method described above according to different moulds:
First SiAlON ceramic plate 2 pieces, is of a size of: 500 mm*600 mm*10 mm; As side plate;
Second SiAlON ceramic plate 2 pieces with holes, is of a size of: 500 mm*600 mm*10 mm; Centre is provided with hole, and aperture is 200mm; As the side plate of logical tail gas;
With the 3rd SiAlON ceramic plate 2 pieces in 10 holes, be of a size of: 500 mm*500 mm*20 mm; As upper and lower cover plate;
As shown in Figure 1 and 2, the device of oil gas combustion tail gas administered by a kind of SiAlON ceramic, it is characterized in that: comprise upper cover plate 1, lower cover 2, side plate 3, device entirety is rectangular structure, side plate 3 has four pieces, lay respectively at the centre of upper cover plate and lower cover, and vertically with upper and lower cover plate to arrange, upper cover plate 1 and lower cover 2 are evenly distributed with several holes, pitch of holes is 18mm, be provided with SiAlON ceramic pipe 4 in hole, the caliber of SiAlON ceramic pipe 4 is 12mm, and the upper end of SiAlON ceramic pipe 4 is horn-like.Wherein two blocks of relative side plates are provided with hole, are respectively import and the outlet of tail gas.
Further, be staggered between adjacent two rows of described SiAlON ceramic pipe 4.Between described SiAlON ceramic pipe 4 and cover plate, contact position is provided with Sialon ceramic powder weighting material 5.
Concrete making method is:
1. get according to design paper sinter molding product, SiAlON ceramic side plate 4 pieces, SiAlON ceramic cover plate 2 pieces, SiAlON ceramic pipe 10.
2. check above product, require that SiAlON ceramic side plate is corresponding between two, within height error≤3mm, within upper and lower cover plate corresponding aperture center≤1mm.
3. four blocks of side plates are surrounded, external application iron wire or steel bar are fixed.
4. upper and lower cover plate is separately fixed at the casing upper and lower faces surrounding formation.
5. SiAlON ceramic pipe is passed successively from the hole that upper and lower cover plate is corresponding, be provided with bell-mouthed one end and be stuck in above upper cover plate.
6. use high-temp glue to be blended into pureed Sialon ceramic powder, be filled in side plate and side plate gap, upper cover plate and side plate gap, lower cover and side plate gap, and SiAlON ceramic pipe and upper and lower cover plate joint, dry shaping.
Embodiment 2:
First provide a kind of SiAlON ceramic to administer the manufacture method of oil gas combustion tail gas device, specifically comprise the following steps:
Specifically comprise the following steps:
(1) get 100kg powdered coal ash fully to mix in ball mill and the fine particle A being ground to below 1000 orders;
Elementary composition (massfraction) of described flyash is: O:49.58%, Si:15.42%, Al:22.89%;
(2) get fine particle A and carry out components tests, obtain the massfraction of O, Si, Al tri-kinds of elements:
(3) in the grinding raw material of above informed of quality mark, add 71.3kg silica flour, 60.8kg aluminium powder makes compound reach elemental mole ratios O:Si:Al=1:1:1, obtains compound B;
(4) compound B is put into nitriding furnace to sinter, nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 3.5 ± 0.5 hours, cooling is come out of the stove, and namely obtains Sai Long (sialon) ceramic powder;
(5) take 100kg and match grand (sialon) ceramic powder, and be added into stirrer, during churning add tung oil gradually, the tung oil amount added is 5% of match grand (sialon) ceramic powder weight, and adding tung oil amount is 5kg weight, obtains mixture C;
(6) mixture C after above stirring is inserted the cold isostatic press that mould is housed, the rate of rise controls at 100 tons/minute, until pressure reaches 1000 tons, then pressure release, the demoulding, obtain SiAlON ceramic base substrate; Base substrate is repaired and dries;
(7) base substrate after above finishing being dried is put into nitriding furnace and is sintered, and nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 8 ± 0.5 hours, cooling is come out of the stove, and obtains SiAlON ceramic part;
(8) according to different needs and size combination SiAlON ceramic part, obtain SiAlON ceramic and administer oil gas combustion tail gas device.During combination, between each assembly, gap place adopts the mixture of step (5) gained to fill.
The present embodiment obtains SiAlON ceramic honeycomb block by cold isostatic press, and as shown in Figure 3, described SiAlON ceramic honeycomb block is cube structure, is of a size of
100*100*100mmhoneycomb block is provided with heat exchange through hole, the cross section of heat exchange through hole is hollow circular, first surface 6 and the 3rd (opposite of first surface, not shown) be provided with heat exchange through hole 1, second face 7 and fourth face (opposite of second, not shown) are provided with heat exchange through hole 29, heat exchange through hole 1 and heat exchange through hole 29 square crossing arrangement but non-intersect.
Described heat exchange through hole one and the aperture of heat exchange through hole two are 5mm, and transverse pitch is 1mm, and longitudinal pitch is 1mm.
In the present embodiment, first surface and the 3rd cross tail gas, and second and fourth face cross combustion air, and the hole crossing combustion air face has in the outermost of ceramic body, requires many 1 row in the hole of combustion air.
9 pieces
100*100*100mmhoneycomb block is built into
300*300*100mm,between each honeycomb block, gap place adopts the mixture of step (5) gained to fill.
Claims (4)
1. a manufacture method for oil gas combustion tail gas device administered by SiAlON ceramic, it is characterized in that: comprise the following steps:
(1) get powdered coal ash fully to mix in ball mill and the fine particle A being ground to below 1000 orders;
(2) get fine particle A and carry out components tests, obtain the massfraction of O, Si, Al tri-kinds of elements:
(3) add in silica flour, aluminium powder in the grinding raw material of above informed of quality mark one or both, make compound reach the requirement of mol ratio O:Si:Al=1:1:1, obtain compound B;
(4) compound B is put into nitriding furnace to sinter, nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 3.5 ± 0.5 hours, cooling is come out of the stove, and namely obtains Sialon ceramic powder;
(5) take Sialon ceramic powder weight, and be added into stirrer, during churning add tung oil gradually, the tung oil amount added is 5% of Sialon ceramic powder weight, obtains mixture C;
(6) mixture C after above stirring is inserted the cold isostatic press that mould is housed, the rate of rise controls at 100 tons/minute, until pressure reaches 1000 tons, and pressurize more than 30 minutes, then pressure release, the demoulding, obtain SiAlON ceramic base substrate; Base substrate is repaired and dries;
(7) base substrate after above finishing being dried is put into nitriding furnace and is sintered, and nitriding furnace heat-up rate controls at 300 DEG C/h, until 1800 DEG C, under the nitrogen atmosphere of 1800 DEG C ~ 2200 DEG C, sinter 8 ± 0.5 hours, cooling is come out of the stove, and obtains SiAlON ceramic part;
(8) according to different needs and size combination SiAlON ceramic part, obtain SiAlON ceramic and administer oil gas combustion tail gas device.
2. the manufacture method of oil gas combustion tail gas device administered by SiAlON ceramic according to claim 1, it is characterized in that: the SiAlON ceramic base substrate that described step (6) obtains is square, circular tube shaped, lath-shaped or intersects cellular.
3. the manufacture method of oil gas combustion tail gas device administered by SiAlON ceramic according to claim 1, it is characterized in that: during described SiAlON ceramic part combination, and between each assembly, gap place adopts the mixture of step (5) gained to fill.
4. the manufacture method of oil gas combustion tail gas device administered by SiAlON ceramic according to claim 1, it is characterized in that: in described flyash, the massfraction of O, Si, Al tri-kinds of elements is: O:42.71% ~ 53.83%, Si:11.48% ~ 31.14%, Al:6.40% ~ 22.91%.
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| CN201410595495.7A CN104402455B (en) | 2014-10-30 | 2014-10-30 | The manufacture method of oil gas combustion tail gas device administered by a kind of SiAlON ceramic |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353256A (en) * | 2008-09-11 | 2009-01-28 | 上海交通大学 | Method for preparing Sialon ceramic powder from aluminum ash and fly ash |
| EP2394974A1 (en) * | 2009-02-09 | 2011-12-14 | IHI Corporation | Process for producing sintered sialon ceramic |
| CN103102160A (en) * | 2013-03-13 | 2013-05-15 | 桂林理工大学 | Microwave sintering method for preparing beta-Sialon powder by using coal ash |
| CN103342560A (en) * | 2013-07-11 | 2013-10-09 | 高源� | Heat exchanging component made of ceramic materials and preparation method thereof |
| CN103922752A (en) * | 2014-03-19 | 2014-07-16 | 北京大学 | Method for preparing beta-SiAlON multiphase material by using fly ash |
-
2014
- 2014-10-30 CN CN201410595495.7A patent/CN104402455B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353256A (en) * | 2008-09-11 | 2009-01-28 | 上海交通大学 | Method for preparing Sialon ceramic powder from aluminum ash and fly ash |
| EP2394974A1 (en) * | 2009-02-09 | 2011-12-14 | IHI Corporation | Process for producing sintered sialon ceramic |
| CN103102160A (en) * | 2013-03-13 | 2013-05-15 | 桂林理工大学 | Microwave sintering method for preparing beta-Sialon powder by using coal ash |
| CN103342560A (en) * | 2013-07-11 | 2013-10-09 | 高源� | Heat exchanging component made of ceramic materials and preparation method thereof |
| CN103922752A (en) * | 2014-03-19 | 2014-07-16 | 北京大学 | Method for preparing beta-SiAlON multiphase material by using fly ash |
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