US3917177A - Method and apparatus for cooling hot materials - Google Patents

Method and apparatus for cooling hot materials Download PDF

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Publication number
US3917177A
US3917177A US324551A US32455173A US3917177A US 3917177 A US3917177 A US 3917177A US 324551 A US324551 A US 324551A US 32455173 A US32455173 A US 32455173A US 3917177 A US3917177 A US 3917177A
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gas
fraction
conveyor
stream
coarse
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US324551A
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Jr Harry E Hoon
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General Electric Environmental Services Inc
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Envirotech Corp
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Assigned to GENERAL ELECTRIC COMPANY, A CORP. OF NY. reassignment GENERAL ELECTRIC COMPANY, A CORP. OF NY. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ENVIROTECH CORPORATION
Assigned to GENERAL ELECTRIC ENVIRONMENTAL SERVICES, INCORPORATED reassignment GENERAL ELECTRIC ENVIRONMENTAL SERVICES, INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GENERAL ELECTRIC COMPANY A NY CORP.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator

Definitions

  • ABSTRACT A method and apparatus for cooling hot materials such as are produced in a burning operation in a kiln.
  • the hot material flowing from the kiln is partially cooled by contact with a stream of gas as it is advanced along a first conveyor.
  • the material is then separated into coarse and fine fractions by a stream of gasf
  • the coarse fraction is crushed while the fine fraction is conveyed by a stream of gas to a cyclone separator, where the gas is partially cooled and where the fines are partially separated from the gas.
  • the stream of gas from the cyclone separator is conducted to a bag-type dust collector where the fines are further separated from the gas stream.
  • the present invention includes a method and apparatus for cooling clinker and at the same time reducing the temperature of the gaseous stream which is utilized in the process of cooling, so as to maintain the temperature of the gaseous stream entering the bag-type dust collector below that which would damage or destroy the material of which the filters are made.
  • a plurality of cooling steps are utilized with an intermediate step of separating the hot material into coarse and fine fractions, and then the coarse fraction is crushed.
  • the fine fraction is introduced into a moving stream of gas which flows into a cyclone separator, before it is conducted to a bag-type dust collector.
  • dust laden gas is taken off at various points in the system and conducted into the common stream which enters the cyclone separator.
  • the stream of gas is thereby cooled as it moves toward the cyclone separator and is further cooled within such separator.
  • the fines are further separated from the gas stream.
  • a kiln from the end 11 of which clinker is discharged onto a first cooler, indicated in general at 15.
  • Such cooler is in the form of an upwardly inclined conveyor onto which the hot material drops from the kiln through a hood 17 at the lower end of the kiln.
  • the cooler has a housing 20 extending the length thereof, which forms a tubular conduit through which a cool gas may flow in contact with the material on the conveyor. The cool gas is introduced into the cooler 15 at 21 and the gas which is heated by contact with the hot material is discharged from the cooler through a conduit 25.
  • Heated gas flowing out of the kiln with the hot material rises in the hood 17 and is discharged therefrom by conduit 26.
  • the hot material leaving the cooler 15 drops by gravity through a conduit 30 across a moving current of cool gas and into a second cooler indicated in general at 31.
  • Such second cooler may have the same construction as the cooler 15 but it is shown as being inclined downwardly, as opposed to the upward inclination of the cooler 15.
  • the moving current of cool gas across which the hot material flows enters a housing 32 at 33 and picks up fine particles and thereby separates the material into a coarse fraction and a fine fraction.
  • the coarse fraction enters the cooler 31 while the fine fraction moves upwardly through the housing 32 and passes between a series of inclined vanes 34, which direct the gas and fines into the housing 32 from whence they flow into the discharge conduit 35.
  • cool gas is introduced at 40 and, after being heated by the material, is discharged at the upper end of the cooler and into the housing 32, or into the conduit 25 in accordance with the least resistance to the flow of the heated gas.
  • conduit 41 From the cooler 31 the material flows through conduit 41 to a crusher indicated in general at 45, from whence it moves through conduit 46 to a storage compartment 47. Dust which originates in the crusher is conveyed by conduit 50 to conduit 51, while dust which occurs in the storage compartment is conveyed by conduit 52 into conduit 51 through conduit 50.
  • the streams of gas flowing through conduits 25, 26 and 35 are combined in conduit 51 which in turn is connected to a cyclone separator 55. The streams of gas are cooled as they flow through their respective conduits and the combined stream is further cooled in the cyclone separator, where the fines are partially separated and are removed at 56 and conveyed to a storage container 57.
  • the gas is discharged from the cyclone separator through conduit 58 and is introduced into the bag-type dust collector 60, from which the separated fines are removed at 61 and conveyed through conduit 62 to the storage container 57.
  • a suction fan 65 maintains a constantly moving stream of gas through the system and discharges clean air to the atmosphere at 66.
  • the system of cooling hot materials in accordance with the present method and apparatus can be carried out in an economical manner without the need for specially designed expensive equipment.
  • the system effectively cools the hot materials, efficiently separates the material into coarse and fine fractions and at the same time lowers the temperature of the heated gas to the point where it is not destructive of the material of which the bag filters are made.
  • Apparatus for cooling hot material of different particle sizes comprising:
  • an upwardly-inclined conveyor for receiving the hot material in a relatively continuous stream and carrying the material upwardly;
  • a first housing surrounding said upwardly-inclined conveyor to form a conduit through which a gas stream passes from the lower end of said upwardlyinclined conveyor to the upper end to contact and partially cool the hot material on the conveyor;
  • a second housing surrounding said downwardlyinclined conveyor to form a conduit through which a gas stream passes countercurrently to contact cool and separate the fine particle fraction from a and partially cool the coarse fraction on the conthe gas stream; and veyor; j. means for maintaining a flowing gas stream through f. means for receiving and crushing the coarse fracthe system.
  • a cyclone separator connected to receive said means for dropping the hot material by gravity across combined gas and fine fraction to cool and to para moving current of cool air as the hot material tially separate the fine fraction from the gasstream; 0 passes from the first cooling means to the second i. means for introducing the gas stream from the cycooling means.

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  • Food Science & Technology (AREA)
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Abstract

A method and apparatus for cooling hot materials such as are produced in a burning operation in a kiln. The hot material flowing from the kiln is partially cooled by contact with a stream of gas as it is advanced along a first conveyor. The material is then separated into coarse and fine fractions by a stream of gas. The coarse fraction is crushed while the fine fraction is conveyed by a stream of gas to a cyclone separator, where the gas is partially cooled and where the fines are partially separated from the gas. The stream of gas from the cyclone separator is conducted to a bag-type dust collector where the fines are further separated from the gas stream.

Description

HOT MATERIALS [75] Inventor: Harry E. Hoon, Jr., Strongsville,
Ohio
[73] Assignee: Envirotech Corporation, Menlo Park, Calif.
[22] Filed: Jan. 17, 1973 [21] Appl. No.: 324,551
[52] US. Cl 241/57; 241/81 [51] Int. Cl. B02c 21/00 [58] Field of Search 241/17, 19, 23, 24, 57, 241/58, 81; 432/13, 20, 77
[56] References Cited UNITED STATES PATENTS 2,375,487 5/1945 Newhouse 241/17 X 2,721,806 10/1955 Oberg et al.. 432/77 X 2,841,384 7/1958 Peterson 241/19 2,904,323 9/1959 Cova et al 432/13 X 2 nd. Cooler United States Patent [191 [111 3,917,177 Hoon, Jr. [4 Nov. 4, 1975 METHOD AND APPARATUS FOR COOLING 3,089,653 5/1963 Ostberg 241/81 Primary ExaminerGranville Y. Custer, Jr. Attorney, Agent, or FirmRobert E. Krebs; Thomas S. MacDonald [57] ABSTRACT A method and apparatus for cooling hot materials such as are produced in a burning operation in a kiln. The hot material flowing from the kiln is partially cooled by contact with a stream of gas as it is advanced along a first conveyor. The material is then separated into coarse and fine fractions by a stream of gasfThe coarse fraction is crushed while the fine fraction is conveyed by a stream of gas to a cyclone separator, where the gas is partially cooled and where the fines are partially separated from the gas. The stream of gas from the cyclone separator is conducted to a bag-type dust collector where the fines are further separated from the gas stream.
2 Claims, 1 Drawing Figure US. Patent Nov. 4, 1975 METHOD AND APPARATUS FOR COOLING I'IOT MATERIALS BACKGROUND OF THE INVENTION It is known in the art that the temperature of cement clinker discharged from a kiln is of the order of 2000 F., and that it must be cooled before it can be subjected to later operations. It is also known that such clinker contains fines which should be recovered for subsequent use, and it is further known that the bag-type dust collector is the most efficient type for separating particles from a gaseous stream. The hot clinker, however, heats the gas which is used for cooling it above a safe temperature which would quickly destroy the material used in the filter bags of the dust collector.
SUMMARY OF THE INVENTION The present invention includes a method and apparatus for cooling clinker and at the same time reducing the temperature of the gaseous stream which is utilized in the process of cooling, so as to maintain the temperature of the gaseous stream entering the bag-type dust collector below that which would damage or destroy the material of which the filters are made. In the present invention a plurality of cooling steps are utilized with an intermediate step of separating the hot material into coarse and fine fractions, and then the coarse fraction is crushed. The fine fraction is introduced into a moving stream of gas which flows into a cyclone separator, before it is conducted to a bag-type dust collector. Additionally, dust laden gas is taken off at various points in the system and conducted into the common stream which enters the cyclone separator. The stream of gas is thereby cooled as it moves toward the cyclone separator and is further cooled within such separator. In the bag-type dust collector, the fines are further separated from the gas stream.
BRIEF DESCRIPTION OF THE DRAWINGS The drawing shows diagrammatically an arrangement of apparatus for carrying out the method of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawing, designates a kiln from the end 11 of which clinker is discharged onto a first cooler, indicated in general at 15. Such cooler is in the form of an upwardly inclined conveyor onto which the hot material drops from the kiln through a hood 17 at the lower end of the kiln. The cooler has a housing 20 extending the length thereof, which forms a tubular conduit through which a cool gas may flow in contact with the material on the conveyor. The cool gas is introduced into the cooler 15 at 21 and the gas which is heated by contact with the hot material is discharged from the cooler through a conduit 25.
Heated gas flowing out of the kiln with the hot material rises in the hood 17 and is discharged therefrom by conduit 26. The hot material leaving the cooler 15 drops by gravity through a conduit 30 across a moving current of cool gas and into a second cooler indicated in general at 31. Such second cooler may have the same construction as the cooler 15 but it is shown as being inclined downwardly, as opposed to the upward inclination of the cooler 15.
The moving current of cool gas across which the hot material flows enters a housing 32 at 33 and picks up fine particles and thereby separates the material into a coarse fraction and a fine fraction. The coarse fraction enters the cooler 31 while the fine fraction moves upwardly through the housing 32 and passes between a series of inclined vanes 34, which direct the gas and fines into the housing 32 from whence they flow into the discharge conduit 35.
As the hot material moves through the cooler 31 cool gas is introduced at 40 and, after being heated by the material, is discharged at the upper end of the cooler and into the housing 32, or into the conduit 25 in accordance with the least resistance to the flow of the heated gas.
From the cooler 31 the material flows through conduit 41 to a crusher indicated in general at 45, from whence it moves through conduit 46 to a storage compartment 47. Dust which originates in the crusher is conveyed by conduit 50 to conduit 51, while dust which occurs in the storage compartment is conveyed by conduit 52 into conduit 51 through conduit 50. The streams of gas flowing through conduits 25, 26 and 35 are combined in conduit 51 which in turn is connected to a cyclone separator 55. The streams of gas are cooled as they flow through their respective conduits and the combined stream is further cooled in the cyclone separator, where the fines are partially separated and are removed at 56 and conveyed to a storage container 57.
The gas is discharged from the cyclone separator through conduit 58 and is introduced into the bag-type dust collector 60, from which the separated fines are removed at 61 and conveyed through conduit 62 to the storage container 57. As the gas stream leaves the cyclone separator its temperature is below that which would be detrimental to the bag filters. A suction fan 65 maintains a constantly moving stream of gas through the system and discharges clean air to the atmosphere at 66.
The system of cooling hot materials in accordance with the present method and apparatus can be carried out in an economical manner without the need for specially designed expensive equipment. The system effectively cools the hot materials, efficiently separates the material into coarse and fine fractions and at the same time lowers the temperature of the heated gas to the point where it is not destructive of the material of which the bag filters are made.
I claim:
1. Apparatus for cooling hot material of different particle sizes comprising:
a. an upwardly-inclined conveyor for receiving the hot material in a relatively continuous stream and carrying the material upwardly;
b. a first housing surrounding said upwardly-inclined conveyor to form a conduit through which a gas stream passes from the lower end of said upwardlyinclined conveyor to the upper end to contact and partially cool the hot material on the conveyor;
0. means arranged at the upper end of said upwardlyinclined conveyor for separating the partially cooled material into coarse and fine fractions;
d. a downwardly inclined conveyor for receiving the coarse fraction;
e. a second housing surrounding said downwardlyinclined conveyor to form a conduit through which a gas stream passes countercurrently to contact cool and separate the fine particle fraction from a and partially cool the coarse fraction on the conthe gas stream; and veyor; j. means for maintaining a flowing gas stream through f. means for receiving and crushing the coarse fracthe system.
tion from said downwardly-sloping conveyor; 5 2. An apparatus of claim 1 in which the means for g. means for combining the gas streams exiting from separating the material into coarse and fine fractions the first and second housing with the fine fraction; comprises,
h. a cyclone separator connected to receive said means for dropping the hot material by gravity across combined gas and fine fraction to cool and to para moving current of cool air as the hot material tially separate the fine fraction from the gasstream; 0 passes from the first cooling means to the second i. means for introducing the gas stream from the cycooling means.
clone separator into a bag-type separator to further

Claims (2)

1. Apparatus for cooling hot material of different particle sizes comprising: a. an upwardly-inclined conveyor for receiving the hot material in a relatively continuous stream and carrying the material upwardly; b. a first housing surrounding said upwardly-inclined conveyor to form a conduit through which a gas stream passes from the lower end of said upwardly-inclined conveyor to the upper end to contact and partially cool the hot material on the conveyor; c. means arranged at the upper end of said upwardly-inclined conveyor for separating the partially cooled material into coarse and fine fractions; d. a downwardly inclined conveyor for receiving the coarse fraction; e. a second housing surrounding said downwardly-inclined conveyor to form a conduit through which a gas stream passes countercurrently to contact and partially cool the coarse fraction on the conveyor; f. means for receiving and crushing the coarse fraction from said downwardly-sloping conveyor; g. means for combining the gas streams exiting from the first and second housing with the fine fraction; h. a cyclone separator connected to receive said combined gas and fine fraction to cool and to partially separate the fine fraCtion from the gas stream; i. means for introducing the gas stream from the cyclone separator into a bag-type separator to further cool and separate the fine particle fraction from the gas stream; and j. means for maintaining a flowing gas stream through the system.
2. An apparatus of claim 1 in which the means for separating the material into coarse and fine fractions comprises, means for dropping the hot material by gravity across a moving current of cool air as the hot material passes from the first cooling means to the second cooling means.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2375487A (en) * 1941-08-11 1945-05-08 Allis Chalmers Mfg Co Clinker cooling
US2721806A (en) * 1952-04-05 1955-10-25 Monolith Portland Cement Compa Cooling method and apparatus for processing cement clinker
US2841384A (en) * 1954-12-23 1958-07-01 Smidth & Co As F L Method and apparatus for cooling materials by gas
US2904323A (en) * 1956-04-20 1959-09-15 Cementir Cementerie Del Tirren Cooling devices for the cement clinkers
US3089653A (en) * 1961-09-20 1963-05-14 Dundee Cement Co Hot clinker conveying and cooling apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2375487A (en) * 1941-08-11 1945-05-08 Allis Chalmers Mfg Co Clinker cooling
US2721806A (en) * 1952-04-05 1955-10-25 Monolith Portland Cement Compa Cooling method and apparatus for processing cement clinker
US2841384A (en) * 1954-12-23 1958-07-01 Smidth & Co As F L Method and apparatus for cooling materials by gas
US2904323A (en) * 1956-04-20 1959-09-15 Cementir Cementerie Del Tirren Cooling devices for the cement clinkers
US3089653A (en) * 1961-09-20 1963-05-14 Dundee Cement Co Hot clinker conveying and cooling apparatus

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Owner name: GENERAL ELECTRIC COMPANY, A CORP. OF NY., NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ENVIROTECH CORPORATION;REEL/FRAME:003933/0138

Effective date: 19810425

AS Assignment

Owner name: GENERAL ELECTRIC ENVIRONMENTAL SERVICES, INCORPORA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL ELECTRIC COMPANY A NY CORP.;REEL/FRAME:004118/0578

Effective date: 19830217