US3716150A

US3716150A - Device for charging coking ovens

Info

Publication number: US3716150A
Application number: US00196563A
Authority: US
Inventors: H Echterhoff; W Herz
Original assignee: Bergwerksverband GmbH
Current assignee: Bergwerksverband GmbH
Priority date: 1970-12-10
Filing date: 1971-11-08
Publication date: 1973-02-13
Anticipated expiration: 1990-02-13
Also published as: DE2060677B2; DE2060677A1; GB1361093A; FR2117046A5; DE2060677C3

Abstract

An outer tubular member has a lower end which is to be placed into communication with the inlet opening of the coking oven, and an upper end which communicates via a normally open back-pressure valve with a coal hopper. The valve closes if back-pressure of a certain magnitude develops in the inlet of the coking oven. An inner tubular member is concentrically accommodated in the outer tubular member and has at its upper end a flange which is connected with the inner side of the outer tubular member so that the members define between themselves an annular gap which is open at the lower end of the outer tubular member. A lower end portion of the inner tubular member converges conically outwardly beyond the lower end of the outer tubular member, and a suction vent communicates with the annular clearance for venting gases which enter the gap.

Description

United States Patent [191 Echterhoff et a1.

[ DEVICE FOR CHARGING COKING OVENS [75] Inventors: Heinrich Echterhoff; Wilfried Herz,

both of Essen, Germany [73] Assignee: Firma Bergwerksverband G.m.b.1l.,

Essen, Germany [22] Filed: Nov. 8, 1971 [21] Appl.No.: 196,563

[30] Foreign Application Priority Data Dec. 10, 1970 Germany ..P 20 60 677.3

[52] US. Cl. ..214/35 R, 202/263 [51] Int. Cl. ..C 10b 31/02 [58] Field ofSearch..214/l8 PH, 35 R; 202/262, 263

[56] References Cited UNITED STATES PATENTS 3,406,098 10/1968 Humez et a1. ..202/263 3,435,596 4/1969 Hornung ..202/263 X [4 1 Feb. 13, 1973 Primary ExaminerRobert G. Sheridan Attorney-Michael S. Striker [5 7] ABSTRACT An outer tubular member has a lower end which is to be placed into communication with the inlet opening of the coking oven, and an upper end which communicates via a normally open back-pressure valve with a coal hopper. The valve closes if back-pressure of a certain magnitude develops in the inlet of the coking oven. An inner tubular member is concentrically accommodated in the outer tubular member and has at its upper end a flange which is connected with the inner side of the outer tubular member so that the members'define between themselves an annular gap which is open at the lower end of the outer tubular member. A lower end portion of the inner tubularmember converges conically outwardly beyond the lower end of the outer tubular member, and a suction vent communicates with the annular clearance for venting gases which enter the gap.

6 Claims, 2 Drawing Figures DEVICE FOR CHARGING COKING OVENS BACKGROUND OF THE INVENTION The present invention relates generally to a filling device, and more particularly to a device for charging coking ovens with coal, especially with dry coal which may or may not be pre-heated.

Coking ovens are charged with coal through, inlet openings provided in the crown or ceiling of the oven. Conventionally this is done by the use of charging cars with move along the outer side of the crown and are provided with one or more coal hoppers through which the coal can freely run out after a closure device, for instance a slidable element, is withdrawn. Alternately, the coal may be discharged from the coal hopper or hoppers of the charging cars via rotary disk feeders or vibratory chutes. The inlet of the coking oven is connected with the coal outlet of the charging car in suitable manner, for instance in well known manner by the use of extensible telescopic charging sockets. It is also known in some instances to provide guide funnels.

Irrespective of the manner in which a coking oven is filled or charged with coal, however, it is inevitable-that during charging the so-called charging gases will escape from the inlet or charging opening, frequently with significant development of dust and smoke. It is too well known to those skilled in the art what the disadvantages of such free escape are, and it will suffice to point out that the prior art proposes withdrawal of these gases by steam-jet nozzles built into the riser pipes, or by suction conduits carried by the charging car. However, none of the approaches thus far suggested have been entirely satisfactory. They .have in particular failed to meet the requirements made of them were the coal has low water content, because the drier the coal, the more is dust and smoke emission during charging. Evidently, therefore, the maximum difficulties in terms of smoke and dust emission will occur when pre-heated coal is charged into the coking oven, because it is of course entirely dry, although the magnitude of the problem will be only slightly smaller if the coal is not preheated but is normally dry. I

The prior-art approaches outlined above contain no proposal which is capable of satisfactorily coping with these difficulties.

SUMMARY OF THE INVENTION It is, accordingly, a general object of the present invention to provide a device which will overcome the disadvantages outlined above with respect to the prior art. I

More particularly, his an object of the invention to provide a device for charging coking ovens with dry coal, which may or may not be pre-heated, which is not possessed of the disadvantages ,of the prior art and which eliminates the difficulties due to smoke and dust emission.

A concomitant object of the invention is to provide such a device which can be utilized with any conventional or indeed known feeding instrumentality such as a charging car, a belt conveyor, a flight conveyor or a conveyor screw.

In pursuance of the above objects and of other which will become apparent subsequently one feature of the invention resides in a device for charging coking ovens with coal, particularly dry coal, which comprises an outer tubular member having a lower end adapted for communication with an inlet opening of the coking oven, and an upper end. A hopper for coal communicates with the upper end and normally open backpressure valve means is interposed between the hopper and the upper end and is adapted to close in response to the development of back pressure.

An inner tubular member is accommodated concentrically in the outer tubular member and has one end portion fixed with the same in an upper section of the latter and a converging other end portion projecting outwardly beyond the lower end. The tubular members define with one another an annular clearance having an open terminus at the lower end and venting means communicates with the annular clearance for venting from the same gases which enter the open terminus.

Center and guide the coal jet which imerges from the device into the inlet opening of the coking oven it is advantageous if in accordance with a further concept of the invention the conically convergent portion of the inner tubular member is provided with an interior constriction, that is if the constriction reduces or constricts the free cross section of the inner tubular member.

It is further advantageous, if the outer tubular member is provided above and below the area where it is connected with the inner tubular member with shear disks which are devices known per se, and which assure that in the event fulmination of coal should occur, the developing over-pressure will not result in danger to personnel and destruction of the device.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a diagrammatic vertical section through a device according to the present invention with the crown ofa coking oven being fragmentarily shown; and

FIG. 2 is a bottom plan view of the device in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Discussing now the drawings in detail, it will be seen that the novel device illustrated by way of example in the drawing, comprises a coal hopper 1 into which dry pre-heated or not pre-heated coal may be introduced in known manner and with any suitable device, such as a charging car, a flight conveyor, a conveyor screw or the like. The hopper l is provided with a back-pressure valve 2 interposed between it and the upper end of an outer tubular member 7 into which the coal is discharged. The purpose of the back pressure valve 2, which is known per se, in its construction, is to assure that upon termination of the charging process the charging gases, for instance resulting from fulmination of the coking oven 6 with whose inlet 6a the lower end of the outer tubular member 7 communicates, cannot enter the hopper 1 and contact the incoming coal. The same is true for prevention of contact of the coal and the hopper l with possible flames which might be omitted through the inlet opening 6a. For this reason, the valve 2 is so constructed that it will close upon the occurrence of even a slight back pressure in the inlet opening 6a. During normal filling operation, the valve 2 is open.

The coal issuing from the hopper 1 and thus a space 3 which is defined by the outer tubular member and an inner tubular member 4 which is concentrically located in the outer tubular member; to the extent possible the space 3 should never be completely empty during the charging process in order to provide an appropriate closure of the inlet opening 6a with respect to the hopper l by the presence of coal in the space 3. The annular constriction 5 provided in the conically diverging end portion of the inner tubular member 4 and through which the coal must pass before it can enter the inlet opening 6a, assures that the coal will enter via the inlet opening 6a into the coking oven 6 in form of a tight compact coal jet which passes through the center of the inlet opening 6a.

The upper end portion ofthe inner tubular member 4 is connected with the inner side of the outer tubular member 7 in the illustrated embodiment via a circumferential flange 4a. The connection is effected in the upper section of the outer tubular member 7 and the

members

7 and 4 thus define with one another an annular gap or clearance 8 which when diagrammatically illustrated sealing means 11 at the lower open end of the outer tubular member 7 engage the upper side of the charging oven 6 circumferentially of the inlet opening 60, will communicate at its lower open terminus with this inlet opening 6a. It should be noted that a portion of the inner tubular member 4 projects forwardly beyond the lower end of the outer tubular member 7 as shown in FIG. 1.

Venting means, here illustrated as a suction socket 9 provided in the outer tubular member 7, communicates with the clearance 8 so that charging gases entering the clearance 8 are either permitted to escape or are withdrawn through the venting means 9. They can then be supplied to a cyclone or a washer where they are treated in conventional manner; alternately they can be conducted into a neighboring coke oven or otherwise treated. In any case, emissions and uncontrolled escape thereof during the charging operation are almost entirely avoided in this manner.

Overpressure which might develop for instance as a result of fulmination of coal in the oven 6 could lead to a destruction of the device or, even to physical harm to an operator. In order to avoid this, so-called shear disks l0 well known per se to those skilled in the art are provided above and below the connection between the inner and outer

tubular members

4 and 7, respectively. In other words, these shear disks 10 which can shear off in response to development of a predetermined overpressure are provided in that wall portion of the outer tubular member 7 which bounds the passage through which the coal passes, that is which bounds the space 3 and in that portion of the wall which bounds the outer side of the clearance 8.

It will be appreciated that resort to the present invention overcomes the disadvantages of the prior art and achieves the objects of the present invention.

It will be understood hat each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.

While the invention has been illustrated and described as embodied in a device for charging coking ovens, with dry coal, it is not intended to be limited to the details shown since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for vari ous applications without omitting features that from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.

' We claim:

1. A device for charging coking ovens with coal, particularly dry coal, comprising an outer tubular member having a lower end adapted for communication with an inlet opening of a coking oven, and an upper end; a hopper for coal communicating with said upper end; normally-open back-pressure valve means interposed between said hopper and upper end and adapted to close in response to development of back pressure; an inner tubular member accommodated concentrically in said outer tubular member and having one end portion fixed with the same in an upper section thereof, and a converging other end portion projecting outwardly beyond said lower end, said tubular members defining with one another an annular clearance having an open terminus at said lower end; and venting means communicating with said annular clearance for venting from the same gases which enter said open terminus.

2. A device as defined in claim 1, wherein said other end portion converges conically.

3. A device as defined in claim 1, wherein said other end portion is provided with a constriction.

4. A device as defined in claim 1, said venting means being a suction socket provided in said outer tubular member and communicating with said clearance intermediate said one end portion and said lower end.

5. A device as defined in claim 1, said one end portion having a circumferential flange connected with one inner surface of said outer tubular member.

6. A device as defined in claim 1; and further comprising shear disks provided on said outer tubular member about and below said one end portion of said inner tubular member.