US3615142A - Prilling tower - Google Patents

Prilling tower Download PDF

Info

Publication number
US3615142A
US3615142A US794976*A US3615142DA US3615142A US 3615142 A US3615142 A US 3615142A US 3615142D A US3615142D A US 3615142DA US 3615142 A US3615142 A US 3615142A
Authority
US
United States
Prior art keywords
walls
shaft
tower
prilling
prilling tower
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 - Lifetime
Application number
US794976*A
Other languages
English (en)
Inventor
Lars-Olov Dahlbom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kemanord AB
Original Assignee
Kemanord AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kemanord AB filed Critical Kemanord AB
Application granted granted Critical
Publication of US3615142A publication Critical patent/US3615142A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops

Definitions

  • the liquid is fed through suitable nozzles and divided into droplets which fall through a gaseous medium, usually air, which cools the droplets so that they solidify into spherical granules or pellets.
  • a gaseous medium usually air
  • solidification is accompanied by partial or complete evaporation of the solvent used.
  • the prilling technique is industrially employed among other things in the manufacture of urea prills and ammonium nitrate prills as well as other substances which form melts or concentrated solutions, particularly those having water as a solvent.
  • a prilling plant generally includes a high tower which encloses a prilling shaft.
  • the nozzles are usually mounted at the top of the shaft and the droplets fall downwardly in the shaft and contact a steram of upwardly moving cooling air introduced at or near the bottom of the shaft.
  • shafts of considerable height are required.
  • fertilizer grade ammonium nitrate prills are manufactured in towers which often are more than 100 meters in height.
  • Early prilling towers were of brick construction, and later types of towers have usually been built as monolithic constructions of reinforced concrete. Towers of the height and construction mentioned above are very heavy and bulky and require a high initial investment.
  • the walls of the prilling shaft become covered with solid deposits of the prilled material.
  • Such deposits disturb the flow pattern within the shaft, and accordingly, as the deposits build up on the walls of the shaft, it becomes necessary to interrupt operation of the apparatus to clean and wash the shaft with water.
  • the salt solutions thus formed have a corrosive action on the walls of the shaft.
  • the shaft walls of flexible material as discussed hereinabove according to the present invention may be employed for covering the shaft walls of a conventional prilling tower formed of the usual materials. Additionally, the material of the present invention may be employed to form intermediate partition walls dividing conventional prilling towers into a plurality of shafts.
  • a preferred embodiment of the invention comprises a prilling tower including a rigid framework formed of metal or the like, and wherein the plastic Wall material is attached to the framework to form the shaft.
  • the flexible wall material according to the invention is of lightweight construction and accordingly it can be added to existing prilling towers without substantially increasing the total weight of the tower. Additionally, the material enables new lightweight low cost prilling towers to be readily constructed.
  • the flexible material is easy to mount in operative position and may without the use of any special tools or equipment be easily shaped to provide shafts having a desired horizontal cross-section. Furthermore, the horizontal crosssection may be readily altered as by making the shaft walls movable or by providing the tower with intermediate partition walls of similar flexible material.
  • the wall material of the present invention require no maintenance and it is not corroded by the melt or the solution to be prilled or by dilute aqueous solutions containing the same or other chemicals.
  • a prilling tower comprising a rigid framework having flexible shaft walls attached thereto and providing a shaft of generally rectangular cross-sectional configuration has the additional advantage that the production capacity of the plant can be increased in a simple and economical manner by adding one or more adjoining towers of similar construction in such a manner that adjacent towers define shafts having at least one shaft wall in common.
  • a prilling tower according to the present invention offers significant operating advantages since the low thermal conductivity of the flexible material of the shaft wall and its lower surface tension towards the melt or solution to be prilled causes the deposits on the shaft walls to adhere poorly to the wall so that the deposits can be easily removed.
  • the shaft walls are attached to the framework in such a manner that they may be flexed. This enables the deposits on the shaft walls to be removed therefrom by shaking or vibrating the Walls. Accordingly, interruptions for cleaning with water and the accompanying formation of crystal pulps or solutions in the bottom of the tower are eliminated.
  • the prilling process can be carried out with an optimal flow pattern within the shaft since the horizontal crosssection of the shaft can be made smaller than usual withoutrisk of disturbances and interruptions of operation.
  • the flow pattern in the shaft can be varied thereby enabling a single prilling tower to be utilized for the manufacture of prills having different properties such as size, porosity and chemical composition, etc.
  • the spraying device may suitably comprise a multi-hole-orifice nozzle which is constructed in such a known manner as to enable interference free operation with droplet formation occurring at a point spaced from the orifices.
  • the drawing is a vertical section through a prilling tower according to the present invention.
  • the prilling tower includes an elongated rigid hollow framework formed of suitable metallic members interconnected with one another to provide an open framework of substantially rectangular cross-sectional configuration.
  • the walls 12 of the tower are formed of a flexible nonwettable corrosion resistant material having low thermal conductivity as dis cussed hereinbefore and preferably comprise a sheet of nylon fabric coated with polyvinyl chloride.
  • the flexible walls are attached to the framework by any suitable means. They may for example be attached to the upper and lower edges of the framework and by means of a number of firmly braced corrosion resistant wires 14 positioned inside the flexible walls be pressed against the corners and sides of the framework.
  • the fabric may be further fastened to the framework at spaced points along the side thereof in such a manner that the fabric maintains its flexibility.
  • a conveyor belt 24 is disposed beneath the sloping walls 18 and 20 for receiving prills from the tower.
  • a conduit 30 connected with a suitable source of liquid melt or solution is provided with a plurality of nozzles 32 for producing the desired droplets. These nozzles are disposed within an enclosure 40.
  • a plurality of fans 42 are mounted in the enclosure for drawing air upwardly through the shaft defined by the framework and flexible walls and thence outwardly of the enclosure 40.
  • the tower may also include a partition indicated by phantom line -P formed of the same material as the walls of the tower for dividing the tower into a plurality of adjacent shafts.
  • a prilling tower which comprises:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fertilizers (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
US794976*A 1968-01-30 1969-01-29 Prilling tower Expired - Lifetime US3615142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1234/68A SE319161B (enExample) 1968-01-30 1968-01-30

Publications (1)

Publication Number Publication Date
US3615142A true US3615142A (en) 1971-10-26

Family

ID=20257834

Family Applications (1)

Application Number Title Priority Date Filing Date
US794976*A Expired - Lifetime US3615142A (en) 1968-01-30 1969-01-29 Prilling tower

Country Status (7)

Country Link
US (1) US3615142A (enExample)
BR (1) BR6905921D0 (enExample)
CH (1) CH528298A (enExample)
DE (1) DE1904326C3 (enExample)
GB (1) GB1209886A (enExample)
IE (1) IE32944B1 (enExample)
SE (1) SE319161B (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819310A (en) * 1971-01-08 1974-06-25 I Mavrovic Apparatus for prilling urea
US4028447A (en) * 1973-04-26 1977-06-07 Agway, Inc. Method of prilling material
US4086346A (en) * 1974-04-06 1978-04-25 Bayer Aktiengesellschaft Preparation of melt-sprayed spherical phenacetin granules
US20010034375A1 (en) * 1996-11-26 2001-10-25 Fritz Schwertfeger Organically modified aerogels, processes for their preparation by surface modification of the aqueous gel, without prior solvent exchange, and subsequent drying, and thier use
US20020032272A1 (en) * 1998-06-05 2002-03-14 Werner Sievers Nanoporous interpenetrating organic-inorganic networks
US6378229B1 (en) 1997-12-19 2002-04-30 Cabot Corporation Method for the sub-critical drying of lyogels to produce aerogels
US6481649B1 (en) 1997-05-02 2002-11-19 Cabot Corporation Method for granulating aerogels
US6620355B1 (en) 1997-05-02 2003-09-16 Cabot Corporation Method for compacting aerogels
US20030207950A1 (en) * 1998-01-14 2003-11-06 Cabot Corporation Method of producing substantially spherical lyogels in water insoluble silylating agents
CN107051326A (zh) * 2017-06-07 2017-08-18 四川施利旺农业科技开发有限公司 复合肥造粒塔体、复合肥造粒设备以及复合肥造粒方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0597163A1 (en) * 1992-11-12 1994-05-18 Niro Holding A/S An atomizer wheel assembly
DE19722738A1 (de) * 1997-05-30 1998-12-03 Hoechst Ag Verfahren zur Herstellung von im wesentlichen kugelförmigen Lyogelen sowie Aerogelen
DE19722737A1 (de) * 1997-05-30 1998-12-03 Hoechst Ag Verfahren zur Herstellung von im wesentlichen kugelförmigen Lyogelen sowie Aerogelen
RU2166989C2 (ru) * 1999-06-29 2001-05-20 Сахаров Владимир Николаевич Устройство для гранулирования жидких материалов
CN103485574B (zh) * 2013-10-08 2015-11-18 贵州开磷建设集团有限公司 一种造粒塔塔顶钢筋混凝土结构施工方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1134204B (de) * 1958-12-06 1962-08-02 Yawata Iron & Steel Co Pelletisiervorrichtung

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819310A (en) * 1971-01-08 1974-06-25 I Mavrovic Apparatus for prilling urea
US4028447A (en) * 1973-04-26 1977-06-07 Agway, Inc. Method of prilling material
US4086346A (en) * 1974-04-06 1978-04-25 Bayer Aktiengesellschaft Preparation of melt-sprayed spherical phenacetin granules
US20010034375A1 (en) * 1996-11-26 2001-10-25 Fritz Schwertfeger Organically modified aerogels, processes for their preparation by surface modification of the aqueous gel, without prior solvent exchange, and subsequent drying, and thier use
US7470725B2 (en) 1996-11-26 2008-12-30 Cabot Corporation Organically modified aerogels, processes for their preparation by surface modification of the aqueous gel, without prior solvent exchange, and subsequent drying, and their use
US6481649B1 (en) 1997-05-02 2002-11-19 Cabot Corporation Method for granulating aerogels
US6620355B1 (en) 1997-05-02 2003-09-16 Cabot Corporation Method for compacting aerogels
US6378229B1 (en) 1997-12-19 2002-04-30 Cabot Corporation Method for the sub-critical drying of lyogels to produce aerogels
US20030207950A1 (en) * 1998-01-14 2003-11-06 Cabot Corporation Method of producing substantially spherical lyogels in water insoluble silylating agents
US7297718B2 (en) 1998-01-14 2007-11-20 Cabot Corporation Method of producing substantially spherical lyogels in water insoluble silylating agents
US6825260B2 (en) 1998-06-05 2004-11-30 Cabot Corporation Nanoporous interpenetrating organic-inorganic networks
US20020032272A1 (en) * 1998-06-05 2002-03-14 Werner Sievers Nanoporous interpenetrating organic-inorganic networks
CN107051326A (zh) * 2017-06-07 2017-08-18 四川施利旺农业科技开发有限公司 复合肥造粒塔体、复合肥造粒设备以及复合肥造粒方法

Also Published As

Publication number Publication date
CH528298A (de) 1972-09-30
GB1209886A (en) 1970-10-21
DE1904326B2 (de) 1972-11-09
IE32944L (en) 1969-07-30
BR6905921D0 (pt) 1973-02-27
IE32944B1 (en) 1974-01-23
SE319161B (enExample) 1970-01-12
DE1904326A1 (de) 1969-09-25
DE1904326C3 (de) 1973-07-19

Similar Documents

Publication Publication Date Title
US3615142A (en) Prilling tower
US20240042480A1 (en) Fluid Bed Granulation Process and Apparatus
FI75279B (fi) Foerfarande foer framstaellning av granulat.
US7955566B2 (en) Fluid bed granulator
FI75278C (fi) Foerfarande foer framstaellning av granulat.
US2968833A (en) Method and apparatus for prilling ammonium nitrate
US2774660A (en) Granulation of fertilizers
US4024210A (en) Sulfur pelletizing
KR100695382B1 (ko) 비스페놀 ａ 프릴의 제조 방법과 장치 및 그에 따라 제조된 비스페놀 ａ 프릴
CA1154213A (en) Sulfur prilling
US3607993A (en) Method of prilling
US3819310A (en) Apparatus for prilling urea
US3933956A (en) Process for prilling urea
US3836611A (en) Process for prilling urea
SU856372A3 (ru) Способ гранулировани жидкого материала и устройство дл его осуществлени
AU611236B2 (en) Controlled break-up of liquid jets
NO166761B (no) Granuleringsinnretning.
US4028447A (en) Method of prilling material
NO751380L (enExample)
US3461489A (en) Apparatus for prilling
US3475195A (en) Process and apparatus for granulating paste
US3887130A (en) Sulfur pelletizing
KR830001410B1 (ko) 조 립 방 법
JPH06134277A (ja) 向流式造粒設備
JPH02290233A (ja) 粒状ゲルの製造装置