CN1022985C - Method for preparing spherical ammonia synthesis catalyst by spraying of rotary granulation nozzle - Google Patents
Method for preparing spherical ammonia synthesis catalyst by spraying of rotary granulation nozzle Download PDFInfo
- Publication number
- CN1022985C CN1022985C CN 88108727 CN88108727A CN1022985C CN 1022985 C CN1022985 C CN 1022985C CN 88108727 CN88108727 CN 88108727 CN 88108727 A CN88108727 A CN 88108727A CN 1022985 C CN1022985 C CN 1022985C
- Authority
- CN
- China
- Prior art keywords
- shower nozzle
- spraying
- synthesis catalyst
- ammonia synthesis
- raw material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000003054 catalyst Substances 0.000 title claims abstract description 14
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 10
- 238000005469 granulation Methods 0.000 title claims description 12
- 230000003179 granulation Effects 0.000 title claims description 12
- 230000015572 biosynthetic process Effects 0.000 title abstract description 4
- 238000003786 synthesis reaction Methods 0.000 title abstract description 4
- 238000005507 spraying Methods 0.000 title abstract 3
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims abstract description 3
- 239000004323 potassium nitrate Substances 0.000 claims abstract description 3
- 239000007921 spray Substances 0.000 claims description 10
- 230000004927 fusion Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 235000012204 lemonade/lime carbonate Nutrition 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 2
- 238000002844 melting Methods 0.000 abstract 2
- 230000008018 melting Effects 0.000 abstract 2
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract 1
- 230000005611 electricity Effects 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 239000012634 fragment Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000012798 spherical particle Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- -1 lime carbonate Chemical compound 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Catalysts (AREA)
Abstract
The present invention relates to a method for manufacturing spherical ammonia synthesis catalyst by adopting rotary granulating nozzle spraying process, and is characterized by that it adopts the selected magnetite, aluminium oxide, potassium nitrate and calcium carbonate as raw material, and adopts the processes of melting in electric melting furnace, spraying rotary granulating nozzle to form ball, cooling by air flow or water or solution, etc.. The invention has yield over 90%, simple production process and equipment, and can realize large-scale industrial production, and compared with the prior balling technology, the invention can reduce the power consumption by more than 30%, and the single-furnace production capacity can be improved by about 50%. The product has low cost, small resistance, high strength and good activity, can save electricity by more than 20 ℃ per ton of ammonia produced, and can improve the production capacity of the synthetic tower by 10-20%.
Description
The present invention is a kind of Preparation of catalysts method, adopts the rotating granulation shower nozzle to spray balling technique, is specially adapted to the preparation of ammonia synthesis catalyst.
Before the present invention makes, people once carried out extensive studies to shaping (sphere or the Else Rule shape) method of ammonia synthesis catalyst, its operational path is broadly divided into two classes: the one, and the compacting sintering moulding method, promptly adopt fusion, solidify, cooling, pulverizing, compression moulding, form through sintering again.For example Denmark Top rope (Tops Φ e) company, Switzerland card Surrey (Casale) company, English Imperial Chemical Industries (ICI) company all adopt this method, and the pan-type pelletizer balling-up of the Soviet Union, and sintering also belongs to this class technology in 1350 ℃ of helium.Their weak point is that complex process, energy consumption and cost are very high, is difficult to realize suitability for industrialized production.The 2nd, the one-step moulding method promptly adopts the operational path of fusion, dispersion, cooling, thermal treatment, screening.Mechanical dispersion and fluid dispersion method balling technique (number of patent application CN85101604A as Zhengzhou University, CN85101606A), these class methods have been simplified technology than the method for before chatting, but owing to adopt bump or impact dispersion, gained catalyst particle size inequality, the shape of product factor is less, the fragment of balling-up and smalls (microballoon that can not use for industry) are not more, thereby finished product yield not high (50～70%), and need through manually pick, time-consuming, product cost and power consumption are still higher.In addition, in this technological process, pour in water or the solution, strong quick-fried spattering very easily taken place, jeopardize the person and device security because of big strand of high temperature (about 1550 ℃) melts arranged.
The objective of the invention is: in the landing moving process, fragment on the basis of the principle of ball and the characteristics of motion thereof studying liquid stream in great detail, adopt simple and easy and can realize the technology and the equipment of large-scale commercial production, produce spherical ammonia synthetic catalyst efficiently.
The method for preparing spherical ammonia synthetic catalyst of the present invention is: earlier with selected magnetite, aluminum oxide, saltpetre, raw materials such as lime carbonate, by a certain percentage behind the mixing, insert fusion in the electric smelter 1, during discharging, the molten slurry of catalyzer in the electric smelter flows in the rotating granulation shower nozzle 3 through discharge port 2, shower nozzle 3 is a cone-shaped, its cone angle is 4 °～16 °, the diameter of the spray orifice 5 on the shower nozzle 3 is 0.002～0.012 meter, 200～500 rev/mins of rotating speeds, shower nozzle 3 is from distance＜2 of discharge port 2 meter, from＜2 meters of prilling tower 4 or cooling pool 4 liquid levels distances, by the spray orifice on the shower nozzle 35 the molten slurry of catalyzer is evenly sprayed into the multiply thread, under rotation condition and action of gravity, thread fragments into very soon and drips, and relies on himself cohesive force contraction balling-up.By the spiral trajectory landing, cooled off by air-flow simultaneously under the outstanding holder of the inverted draft of this spherical particles certain flow rate (less than floating velocity) in prilling tower 4, be transported to sizing screen then; Or the water or other solution that directly fall into cooling pool 4 sharply cools off, and by separating device with ball and solution separately, after heat treatment delivers to sizing screen, becomes the finished product of the spherical catalyst of various different grain size grades.
Characteristics of the present invention are to adopt the rotating granulation shower nozzle to disperse, make the sub-thread melts liquid stream that all changes from the effusive flow velocity of electric smelter discharge port and flow, by the spray orifice on the rotating granulation shower nozzle, become the certain multiply thread of flow and evenly spray the granulation balling-up, thereby the spherical catalyst epigranular that obtains, finished product yield high especially (diameter greater than 0.002 meter reach more than 90%), thereby greatly reduce the power consumption and the cost of Catalyst Production, compare with existing balling-up technology, power consumption can reduce more than 30%, and single stove throughput can improve about 50%.Can be easy to make required various varigrained catalyzer by changing injection diameter as required simultaneously.Technology of the present invention is not only applicable to the wet method cooling (falling into water or solution) of aforementioned prior art, but also is applicable to dry method cooling (being cooled off by air-flow in prilling tower).Promptly the spherical particles of spiral trajectory landing is pressed in ejection from spray orifice, in prilling tower, slowly fall under the inverted draft effect, simultaneously by gas cooling, thereby do not need heat treatment step, complete and the non-notch of prepared thus spheroidal particle, the finished state factor is near 1, the intensity height, resistance is especially little, and avoided in mechanical dispersion and the fluid dispersion method (wet method cooling) spherical particles to solidify and in the inner entry of state whereabouts or solution of solidifying not yet effectively in appearance, be subjected to the water surface to clash into the shortcoming that forms breach and reduce shape-dependent constant and physical strength, cast out thermal treatment simultaneously and chosen the ball operation, eliminated the quick-fried generation of spattering of high temperature, simplified technology and realized safety, the purpose of High-efficient Production has reduced power consumption and cost.
Accompanying drawing 1, rotating granulation shower nozzle process flow diagram
Behind raw material blending, insert in the electric smelter 1, flow in the rotating granulation shower nozzle 3 through discharge port 2 during discharging, by the spray orifice on the shower nozzle 35, will melt slurry and be dispersed into the multiply thread, drop in prilling tower or the cooling pool 4.
Embodiment:
Flow process of the present invention (seeing accompanying drawing 1), 50 kilovolt-amperes in electric smelter transformer of experiment, 0.3 * 0.2 * 0.2 meter of electric smelter
310 ° of the cone cone angles of rotating granulation shower nozzle 3,0.004 meter of spray orifice 5 diameter, 325 rev/mins of rotating speeds, discharge port 2 adds 6.0 kilograms of compounds to＜2 meters of shower nozzle 3 distances during experiment, come out of the stove 4.3 kilograms, 4.038 kilograms of finished products (diameter＞0.002 meter), finished product yield 93.9%, the active and physical strength of product reaches industrial service requirements.
Claims (1)
1, a kind of by selected magnetite, saltpetre, aluminum oxide, lime carbonate etc. are raw material, make the method for spherical ammonia synthetic catalyst, comprise raw material mixed by a certain percentage after, insert fusion in the electric smelter (1), adopt rotating granulation shower nozzle (3) to spray granulation, in prilling tower (4), cooled off or directly fall into water or solution refrigerative technology by inverted draft, make spherical ammonia synthetic catalyst, the cone cone angle of above-mentioned rotating granulation shower nozzle (3) is 4 °-16 °, the diameter of the spray orifice (5) on the shower nozzle (3) is a 0.002-0.012 rice, rotating speed 200-500 rev/min, from distance＜2 of electric smelter discharge port (2) meter, liquid level distance from prilling tower or cooling pool (4) is＜2 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108727 CN1022985C (en) | 1988-12-17 | 1988-12-17 | Method for preparing spherical ammonia synthesis catalyst by spraying of rotary granulation nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108727 CN1022985C (en) | 1988-12-17 | 1988-12-17 | Method for preparing spherical ammonia synthesis catalyst by spraying of rotary granulation nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1043272A CN1043272A (en) | 1990-06-27 |
| CN1022985C true CN1022985C (en) | 1993-12-08 |
Family
ID=4835179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88108727 Expired - Fee Related CN1022985C (en) | 1988-12-17 | 1988-12-17 | Method for preparing spherical ammonia synthesis catalyst by spraying of rotary granulation nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022985C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050818C (en) * | 1993-08-27 | 2000-03-29 | 中国科学院金属研究所 | Preparation of high-active synthetic ammonia catalyst |
| CN108212907B (en) * | 2017-12-21 | 2020-04-10 | 阮豪杰 | Vertical washing device for rare earth oxalate |
| CN112645359B (en) * | 2019-10-09 | 2023-07-25 | 四川省什邡市农科化工有限公司 | Potassium nitrate low-tower granulation method and potassium nitrate granules prepared by same |
-
1988
- 1988-12-17 CN CN 88108727 patent/CN1022985C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1043272A (en) | 1990-06-27 |
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