CN101423202B - Ammoxidation furnace formed by novel platinum net brace that is catalyst basket and support structure thereof - Google Patents
Ammoxidation furnace formed by novel platinum net brace that is catalyst basket and support structure thereof Download PDFInfo
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- CN101423202B CN101423202B CN2008101825580A CN200810182558A CN101423202B CN 101423202 B CN101423202 B CN 101423202B CN 2008101825580 A CN2008101825580 A CN 2008101825580A CN 200810182558 A CN200810182558 A CN 200810182558A CN 101423202 B CN101423202 B CN 101423202B
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Abstract
The invention relates to an ammonia oxidation stove consisting of a novel platinum net bracket-based catalyst frame and a supporting structure thereof; a concrete vertical column is erected at the center of a pipe box in front of an oxidation furnace/waste boiler; furthermore, the upper end of the concrete vertical column supports a bracket which is provided with screens so as to form a CDM catalyst frame; the CDM catalyst is provided with a platinum net; the circumference of the bracket-based catalyst frame is heat-insulated by a ceramic fiber blanket; when the CDM catalyst is not loaded, the screen is canceled and the platinum net is directly arranged on the bracket. The ammonia oxidation stove has the advantages that the bracket is made of high-temperature alloy HP-Nb or HK-40 which generates no high-temperature oxidation even under a use state of high temperature; furthermore, the bracket has enough bending section modulus under the use temperature, has simple structure and smaller manufacture difficulty; furthermore, the ammonia oxidation stove completely meets the requirement of installation of the platinum net and the filling of a catalyst which is used for emission reduction of N2O for the newly increased CDM project, leads the platinum net and the catalyst to be the best condition of horizontal surface when in use, ensures the platinum net and the catalyst to achieve the normal design service life; the ammonia oxidation stove belongs to maintenance-free design, and reduces the shutdown maintenance time of the system, the maintenance expense and the heat dissipation loss of the oxidation stove.
Description
Technical field
The present invention relates to a kind of converter for ammonia oxidation of being made up of novel platinum guaze carriage both catalyst basket and supporting structure thereof, this carriage is used to support the catalyzer of oxidative ammonolysis---platinum guaze, and reduce discharging N as CDM
2The catalyst basket of O belongs to component assembly design, manufacturing field in the ammonium oxidizing furnace in nitric acid plant.
Background technology
In the at present domestic and international non-pressure process nitric acid production plant, the oxidative ammonolysis temperature is controlled at 800～860 ℃; Platinum guaze supporting structure in the converter for ammonia oxidation, the one, use adjustable heat-resistant steel wire, the 2nd, with heat-resisting steel sheet and plate (Cr25Ni20 level or high level Incoloy 800H) weldering system carriage.Though these two kinds of structures can be kept ordinary production under this high temperature, all have tangible problem and shortage: adjustable heat-resistant steel wire setting range is limited, steel wire is easily broken, only can bear platinum guaze weight, can not satisfy newly-increased CDM project fully reduces discharging N
2The O needs of catalyst loading; Expose problems in the weldering system carriage life-time service: the one, above-mentioned heat-resisting steel sheet and plate is under this high temperature, and the rigidity extreme difference uses and promptly produces downward flexural deformation soon, and stove diameter gross distortion more is serious more; The 2nd, though large diameter stove is provided with the supporting beam/rod structure with heat-resisting steel sheet and plate or pipe weldering system below carriage, because of its rigidity still very poor, this metal support structure at high temperature self is out of shape inharmonious because of expansion produces, can not solve carriage equally and be bent downwardly problem on deformation; The 3rd, because weldering system carriage reduces ammonia oxidation rate because of platinum guaze off-clip or damage easily, shortened the life cycle of expensive platinum guaze; The 4th, for being installed, weldering system carriage and supporting structure must on the oxidized still shell, weld a large amount of gussets, and cause the shell local temperature to raise, increase heat lost by radiation; The 5th, fabriform can be because of high temperature oxidation scaling loss attenuate with sheet material, and weld seam easily cracks even ruptures, and often needs repair welding, needs after the bending to proofread and correct, and maintenance load is big, the repair time is long, has hindered the device long-term operation; The 6th, newly-increased CDM project reduces discharging N
2O with catalyst loading after, the carriage loading increases, and is bent downwardly the distortion aggravation, in case platinum guaze and silk screen off-clip or damage, catalyzer will drain to useless pan pipe case bottom, can not fully contact with process gas and lose efficacy, and expensive CDM catalyzer can not normally be played a role.
Summary of the invention
Purpose of design: avoid the medium-term and long-term deficiency that exists of background technology, solve the newly-increased CDM project of nitric acid production and reduce discharging N
2The design challenges of O catalyst basket satisfies the converter for ammonia oxidation of being made up of novel platinum guaze carriage both catalyst basket and supporting structure thereof that CDM requires with the filling of catalyzer.
Design: in order to realize above-mentioned purpose of design.1, (HK40 can satisfy service requirements: but this carriage is too little in batches to select superalloy HP-Nb or HK-40 casting for use, HP-Nb is more commonly used in current alloy furnace tubes by adopting factory), the reason that these two kinds of materials are used for the nitric acid oxidation stove is: because these two kinds of materials are used in the more harsh synthetic ammonia of condition, methyl alcohol, in the industries such as oil refining in the boiler tube of tubular oven, the typical condition of its life-time service can reach: interior pressure 3～4MPa, 850～980 ℃ of tube wall metal temperatures, 950～1050 ℃ of metal temperatures) (typical condition of life-time service: important High Temperature High Pressure parts such as all have the ripe use experience of many decades both at home and abroad to be used for the convection chamber tube support plate.2, utilization bionics, with the carriage planar design is " spider web " shape, in conjunction with the cross-sectional shape of optimization design, improve self rigidity/non-deformability to greatest extent, solved problem inharmonious in the background technology, that welded construction often ftractures in the commissure, damages because of being out of shape.3, large diameter oxidized still design: (1) adopts middle part disk, peripheral piecemeal segmental structure, has solved compatibility of deformation, the relatively poor problem of superalloy casting fluidity of carriage, has not only guaranteed use, and has reduced the casting difficulty; (2) disk is supported by the heat-resisting concrete column of heavy at center, the thermal expansivity of heavy concrete is far below superalloy, through accurate calculation its hot swell increment, the column end face is lower than the bearing surface respective numbers of periphery during installation, makes that the plane remains on the ideal horizontal plane on the carriage under working temperature; (3) because fulcrum shortens, moment of flexure reduces, foundry goods can adopt less sectional dimension still to have enough module of anti-bending section, thereby has reduced the superalloy consumption; (4) convenient maintenance.4, bracket perimeter is supported on the heavy concrete of oxidized still housing casting, has avoided many detrimentally affects that the high temperature deformation of metal support member brings in the background technology and because the heat lost by radiation of bracket support on the welding gusset.5, design three types of serial carriages, be applicable to the oxidized still of different diameter scope.
Technical scheme 1: by the converter for ammonia oxidation that platinum guaze carriage both catalyst basket and supporting structure thereof are formed, it comprises oxidized still, and the carriage center disk is supported by the heat-resisting heavy concrete column at oxidized still and useless pot front header center, and platinum guaze directly is layered on the carriage.
Heat-resisting heavy concrete column hypomere is positioned at useless pot front header bottom, and bracket perimeter is supported by the heat-resisting heavy concrete that is positioned on the oxidized still housing.The carriage planar design is the spider web structure.Carriage is selected for use and is HP-Nb or HK40 material casting.Carriage adopts center disk, peripheral multi-disc fan-shaped, and individual cast, assembly unit become complete carriage; Or carriage integral casting forming.Use the fine blanket thermal insulation of making pottery between carriage, catalyst basket outer ring and the oxidized still shell; Fire-resistant/the insulating structure of oxidized still/useless pot front header is the adiabatic concrete of heat-insulating fiber plate, lightweight, the fire-resistant concrete of heavy successively from the shell to the side towards the fire.
Technical scheme 2: the converter for ammonia oxidation of forming by platinum guaze carriage both catalyst basket and supporting structure thereof, it comprises oxidized still, the carriage center disk is supported by the heat-resisting heavy concrete column at oxidized still and useless pot front header center, be equipped with silk screen on the carriage to constitute catalyst basket, filling CDM catalyzer on the silk screen, platinum guaze places on the CDM catalyzer.
The present invention compares with background technology, and the one, selection is reasonable, and bracket material is selected superalloy HP-Nb or HK-40 for use, has both made under the state that high temperature uses, and also can not produce high temperature oxidation; The 2nd, be skillfully constructed, reasonable in design, this carriage has enough module of anti-bending section, has taken into full account the compatibility of deformation of structure under use temperature, simple in structure, manufacture difficulty is less, once investment economizes; The 3rd, satisfy platinum guaze fully and install and increase newly CDM project reduction of discharging N
2O makes platinum guaze and the catalyzer optimum that is in horizontal plane in service with the requirement of catalyst loading, guarantees that platinum guaze and catalyzer reach normal design service life; Four are to use the life-span long, and belonging to does not have the maintenance design, reduce the system shutdown repair time, improve system's operation factor; Reduce maintenance cost; The 5th, avoided on the old structure housing thermosteresis of welding gusset; The 6th, the operation of the oxidized still and the apparatus system thereof of micro-negative pressure operation can be ignored (CDM is except the resistance of catalyzer increase), do not influenced to the resistance that increases.
Description of drawings
Fig. 1 is both synoptic diagram of the ammonium oxidizing furnace in nitric acid plant formed of catalyst basket and supporting structure of I type platinum guaze carriage.
Fig. 2 is the synoptic diagram of the ammonium oxidizing furnace in nitric acid plant of I type platinum guaze carriage and supporting structure composition.
Fig. 3 is the A-A sectional view among Fig. 1 or Fig. 2.
Fig. 4 is both structural representations of catalyst basket of II type platinum guaze carriage.
Fig. 1-1 Fig. 4-the 1st, the partial enlarged drawing among Fig. 1, Fig. 4.
Fig. 5 is the structural representation of II type platinum guaze carriage.
Fig. 2-1, Fig. 5 the-the 1st, the partial enlarged drawing among Fig. 2, Fig. 5.
Fig. 6 is the vertical view of piece number 5 carriages among Fig. 4 or Fig. 5.
Fig. 7 is both structural representations of catalyst basket of III type platinum guaze carriage.
Fig. 8 is the structural representation of III type platinum guaze carriage.
Embodiment
Embodiment 1: with reference to accompanying drawing 1, Fig. 1-1, Fig. 3.The converter for ammonia oxidation of forming by novel platinum guaze carriage and supporting structure thereof, it comprises oxidized still, be equipped with silk screen on the carriage to constitute catalyst basket, the carriage center disk is supported by the heat-resisting heavy concrete column at oxidized still and useless pot front header center, filling CDM catalyzer on the silk screen, platinum guaze places on the CDM catalyzer.
Fig. 1 has represented both ammonium oxidizing furnace in nitric acid plant of forming of catalyst basket and supporting structure of I type platinum guaze carriage.It comprises: the center disk that is filled in useless pot front header 11 bottoms, upper end Support bracket 5 is watered in the fire-resistant concrete column 6 of heavy, concrete column 6 lower ends that erect at oxidized still housing 7 and useless pot front header 11 centers, and the sector outer ring of carriage 5 is supported on the fire-resistant concrete 8 of heavy of oxidized still housing 7 tops pouring; Carriage 5 is equipped with silk screen 3 to constitute catalytic basket, and CDM catalyzer 2 is loaded in above the silk screen 3 and inboard, and platinum guaze 4 is layered on the CDM catalyzer 2; Clamp platinum guaze 4, platinum guaze 4 is located with the two-layer platinum guaze trim ring 12 of bolting, platinum guaze trim ring 12 places on the lower housing flange 13-1, top is upper housing flange 13-2; Carriage 5 planar designs are the spider web structure, adopt center disk, peripheral multi-disc fan-shaped assembled; Silk screen 3 material 25%Cr20%Ni or above rank, carriage 5 materials are HP-Nb or HK40; Adiabatic between catalyst basket outer ring that carriage 5 and silk screen 3 constitute and the lower housing flange 13-1 with fine blanket 1 filling of making pottery; The fire-resistant concrete 8 of heavy of concrete column 6, oxidized still housing 7 top periphery pouring bears the load that deadweight and CDM catalyzer 2 bed resistances by carriage 5 and CDM catalyzer 2 are produced jointly; Fire-resistant/the insulating structure of oxidized still housing 7/ useless pot front header 11 is the adiabatic concrete 9 of heat-insulating fiber plate 10, lightweight, the fire-resistant concrete 8 of heavy successively from the shell to the side towards the fire.
Embodiment 2: with reference to accompanying drawing 4, Fig. 4-1, Fig. 6.Fig. 4 has represented both converter for ammonia oxidations of forming of catalyst basket of II type platinum guaze carriage, is applicable to the oxidized still that diameter is littler than embodiment 1; Carriage 5 integral casting formings, its outer ring are supported on the fire-resistant concrete 8 of heavy of oxidized still housing 7 top periphery pouring---and heavy concrete 8 herein bears the deadweight of carriage 5 and CDM catalyzer 2 and whole load that CDM catalyzer 2 bed resistances are produced; Concrete column 6 is not set; All the other and embodiment 1 are roughly the same.
Embodiment 3: with reference to accompanying drawing 7, by the converter for ammonia oxidation that III type platinum guaze carriage both catalyst basket is formed, be applicable to the oxidized still that diameter is littler than embodiment 2; Carriage 5 integral casting formings, its outer ring are supported on the oxidized still lower flange 13-2, bear the deadweight of carriage 5 and CDM catalyzer 2 and whole load that CDM catalyzer 2 bed resistances are produced by lower flange 13-2; All the other and embodiment 1 are roughly the same.
Embodiment 4: by the converter for ammonia oxidation that novel platinum guaze carriage and supporting structure thereof are formed, it comprises oxidized still, and the carriage center disk is supported by the heat-resisting heavy concrete column at oxidized still and useless pot front header center, and platinum guaze directly is layered on the carriage.
With reference to accompanying drawing 2, Fig. 2-1, Fig. 3, Fig. 2 has represented the ammonium oxidizing furnace in nitric acid plant that I type platinum guaze carriage and supporting structure are formed, owing to do not load CDM catalyzer 2, therefore cancels silk screen 3, and platinum guaze 4 is laid immediately on the carriage 5; All the other and embodiment 1 are roughly the same.
With reference to accompanying drawing 5, Fig. 5-1, Fig. 6, Fig. 5 has represented the ammonium oxidizing furnace in nitric acid plant that I type platinum guaze carriage and supporting structure are formed, owing to do not load CDM catalyzer 2, therefore cancels silk screen 3, and platinum guaze 4 is laid immediately on the carriage 5; All the other and embodiment 2 are roughly the same.
With reference to accompanying drawing 8, by the ammonium oxidizing furnace in nitric acid plant that III type platinum guaze carriage is formed,, therefore cancel silk screen 3 owing to do not load CDM catalyzer 2, platinum guaze 4 is laid immediately on the carriage 5; All the other and embodiment 3 are roughly the same.
Example 1: this application has is pressed Fig. 1, shown in Figure 3, tests on the oxidized still of two micro-negative pressure operations, replaces catalyzer 2 catalyst basket of packing into the close alumina balls of particle diameter; 850 ℃ of operating temperatures, systemic resistance do not have obviously and increase, and operation is normal; Maintenance next time only needs alumina balls are drawn off, are replaced by the CDM catalyzer.
Example 2: this application has is tested on the oxidized still of a pressurized operation by shown in Figure 7, replaces catalyzer 2 catalyst basket of packing into, 905 ℃ of operating temperatures with the close alumina balls of particle diameter; Operation is normal; Simultaneously, an III type platinum guaze carriage has been prepared by shown in Figure 8 by our company, uses when not adorning catalyzer.
What need understand is: though the foregoing description is to the present invention's detailed text description of contrasting; but these text descriptions; just the simple text of mentality of designing of the present invention is described; rather than to the restriction of mentality of designing of the present invention; any combination, increase or modification that does not exceed mentality of designing of the present invention all falls within the scope of protection of the present invention.
Claims (7)
1. converter for ammonia oxidation of being made up of platinum guaze carriage both catalyst basket and supporting structure thereof, it comprises oxidized still, it is characterized in that: the carriage center disk is supported by the heat-resisting heavy concrete column at oxidized still and useless pot front header center, and platinum guaze directly is layered on the carriage.
2. the converter for ammonia oxidation of being made up of platinum guaze carriage both catalyst basket and supporting structure thereof according to claim 1 is characterized in that: heat-resisting heavy concrete column hypomere is positioned at useless pot front header bottom, and bracket perimeter is supported by the heat-resisting heavy concrete that is positioned on the oxidized still housing.
3. the converter for ammonia oxidation of being made up of platinum guaze carriage both catalyst basket and supporting structure thereof according to claim 1 is characterized in that: the carriage planar design is the spider web structure.
4. according to claim 1 or the 3 described converter for ammonia oxidations of being made up of platinum guaze carriage both catalyst basket and supporting structure thereof, it is characterized in that: carriage adopts center disk, peripheral multi-disc fan-shaped, and individual cast, assembly unit become complete carriage; Or carriage integral casting forming.
5. the converter for ammonia oxidation of being made up of platinum guaze carriage both catalyst basket and supporting structure thereof according to claim 1 is characterized in that: use the fine blanket thermal insulation of making pottery between carriage, catalyst basket outer ring and the oxidized still shell; Fire-resistant/the insulating structure of oxidized still/useless pot front header is the adiabatic concrete of heat-insulating fiber plate, lightweight, the fire-resistant concrete of heavy successively from the shell to the side towards the fire.
6. the converter for ammonia oxidation of being made up of platinum guaze carriage both catalyst basket and supporting structure thereof according to claim 1 is characterized in that: carriage is selected for use and is HP-Nb or HK40 material casting.
7. converter for ammonia oxidation of forming by platinum guaze carriage both catalyst basket and supporting structure thereof, it comprises oxidized still, it is characterized in that: the carriage center disk is supported by the heat-resisting heavy concrete column at oxidized still and useless pot front header center, be equipped with silk screen on the carriage to constitute catalyst basket, filling CDM catalyzer on the silk screen, platinum guaze places on the CDM catalyzer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101825580A CN101423202B (en) | 2008-12-09 | 2008-12-09 | Ammoxidation furnace formed by novel platinum net brace that is catalyst basket and support structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101825580A CN101423202B (en) | 2008-12-09 | 2008-12-09 | Ammoxidation furnace formed by novel platinum net brace that is catalyst basket and support structure thereof |
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| CN101423202A CN101423202A (en) | 2009-05-06 |
| CN101423202B true CN101423202B (en) | 2011-05-04 |
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| EP3210939A1 (en) * | 2016-02-24 | 2017-08-30 | Casale SA | A reactor for oxidation of ammonia in the production of nitric acid |
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