Sealing arrangement for coke oven door

A coke oven door, which is positioned within a door frame in a closed position, has inner and outer sealing strips which contact the door frame. The two sealing strips jointly form a gas guide duct with the door frame. The inner sealing strip forms an elastic and flexible seal which prevents solids from passing into the guide duct but which allows gas to pass thereto. The outer sealing strip forms a gas-tight nonflexible seal.

BACKGROUND OF THE INVENTION 
The present invention relates to a sealing arrangement for a coke oven 
door, and particularly such an arrangement including an inner sealing 
strip that seals against solids and an outer gastight sealing strip. Such 
sealing strips, when in the sealing position, define jointly with the door 
frame a guide duct for removing the gases leaving the over chamber, the 
guide duct being under a lower pressure than the oven chamber in the area 
of the coal pile or charge therein. 
A sealing arrangement of this type is shown in German Utility Model No. 
1,897,929 wherein the inner sealing strip is welded in the form of a rigid 
half-round rib on the side walls of the door plug, so that the vertex of 
such rib is positioned at a small distance from the frame jamb of the door 
opening. An edge of the outer sealing strip contacts an outwardly facing 
sealing surface of the door frame. Small dimension tolerances are required 
in such an arrangement, since the exact position of the sealing strips in 
relation to each other and in relation to the door frame, as well as the 
degree of wear of the sealing edge of the outer sealing strip, are 
determinative of the width of the gap between the vertex of the inner 
sealing strip and the frame jamb. Due to the position and shape of the 
inner sealing strip, the passage of gas into the guide duct is impeded by 
dirt, and thus the mobility of the coke oven door is hindered. 
SUMMARY OF THE INVENTION 
An object of the present invention is to eliminate the above disadvantages 
while providing a coke oven door sealing arrangement of the above type 
which, with relatively low expenditure, provides a reliable and lasting 
seal, and with which the removal of gas is effective during the entire 
operational period. 
It is a further object of the invention to provide such an arrangement 
without the necessity of having to accurately adjust the position and 
dimensions of the two sealing strips in relation to each other. 
These objects are achieved by providing that the inner sealing strip 
contacts the door frame in an elastic and flexible manner and that the 
outer sealing strip contacts the door frame in a nonelastic manner. Due to 
this arrangement, the outer sealing strip forms a firm, gastight abutment 
when the coke oven door is closed, and the inner sealing strip contacts 
the door frame in an elastic sealing manner, without the necessity of 
having to specifically adjust the exact reciprocal positions of the 
sealing edges of the two sealing strips. 
The inner sealing strip is preferably angular in shape, and in a preferred 
embodiment it is Z-shaped. Due to this angular configuration, an elastic 
sealing effect is obtained, even when relatively rigid material is used. 
The outer sealing strip may be flat in shape and have a vertically 
extending sealing edge contacting a sealing surface of the door frame. Due 
to this configuration, a nonflexible and rigid sealing effect is obtained, 
even when a relatively flexible material is used. 
In a relatively simple embodiment of the invention, the two sealing strips 
contact each other at areas thereof spaced from their respective edges 
which contact the sealing surfaces of the door frame. In such embodiment, 
the two sealing strips are attached to the coke oven door at the areas of 
mutual contact. 
Preferably, the two sealing strips are components of a single structural 
element. 
In an advantageous embodiment, the guide duct is obtained in such a manner 
that the two sealing strips, when in the sealing position of the coke oven 
door, contact separate sealing surfaces of the door frame situated in 
separate planes. 
The sealing strips preferably contact outwardly facing sealing surfaces of 
the door frame, in order to maintain soiling of the sealing surfaces at a 
low level, to make it possible to easily clean the duct and strips, and in 
order to avoid any detrimental effect on the mobility of the coke oven 
door. If the inner sealing strip contacts an obliquely outwardly facing 
sealing surface of the door frame, the elastic flexible property of the 
inner sealing strip can be utilized in a very simple manner. 
The inner sealing strip consists with advantage of an elastic and flexible 
material. 
The outer sealing strip may include a band of material such as asbestos or 
the like, which makes contact in a firm and sealing manner with the door 
frame.

DETAILED DESCRIPTION OF THE INVENTION 
A coke oven door 1 closes an oven chamber 2 of a coke oven. A door frame 4 
is attached to a wall protecting plate 3 of oven chamber 2 by means of 
clamping elements 5. 
Coke oven door 1 is pressed from the outside against door frame 4 by means 
of a locking device that may be conventional and thus is not shown in the 
drawings. Door 1 includes holding elements 6 supporting and receiving a 
door plug 7. 
An inner sealing strip 9 and an outer sealing strip 10 are attached to coke 
oven door 1 by means such as the illustrated eccentric bolts 8 or clamping 
bolts. Inner sealing strip 9 is Z-shaped in lateral cross-section. One arm 
of Z-shaped sealing strip 9 contacts outer sealing strip 10. The edge of 
the other arm of Z-shaped sealing strip 9 and the edge of outer sealing 
strip 10 contact, according to the embodiment of FIG. 1, a common 
outwardly facing sealing surface 11 of door frame 4. In the embodiments of 
FIGS. 2 and 3, separate sealing surfaces 12 and 13 are provided for each 
of sealing strip 9 and 10, respectively. Sealing surfaces 12 and 13 are 
situated in different planes of door frame 4, and sealing surface 12 of 
the embodiment of FIG. 3 is aligned obliquely outwardly. 
Inner sealing strip 9 consists of an elastic material, preferably a 
suitable metal, and its seal with surfaces 11 or 12 is not gastight. 
Rather, strip 9 need merely prevent the penetration of coal into a guide 
duct 14 formed between sealing strips 9 and 10. Outer sealing strip 10 
seals guide duct 14 in gastight manner in relation to the surrounding 
space and is preferably formed of metal. However, strip 10 may also be 
formed of other nonflexible heat-resistant materials such as asbestos, for 
example. 
A gap 15 exists between brick holder 6, or door plug 7, and door frame 4, 
or wall protecting plate 3. The dimensions of gap 15 are such that it is 
possible to move coke oven door 1 before and after the coking operation. 
The operation and function of the above described sealing arrangement will 
now be described. 
When coke oven door 1 is closed, outer sealing strip 10 is placed in 
nonflexible gastight sealing contact against respective sealing surface 11 
or 13. Elastic flexible inner sealing strip 9 is placed against respective 
sealing surface 11 or 12 in a manner such that it automatically provides a 
seal against the penetration of solids into duct 14. 
When coke oven chamber 2, thereby closed by means of door 1, is filled with 
coal, for instance with a coal pile or charge as shown at 16 in FIG. 4, 
the coal will extend into gaps 15 on opposite sides of door 1. However, 
inner sealing strips 9 prevent the penetration of coal into respective 
guide ducts 14, and thus obstruction of the ducts 14 are prevented. The 
high pressure gas generated in oven chamber 2 adjacent gaps 15 during the 
coking operation escapes through inner sealing strips 9 into respective 
guide ducts 14. Such gas passes upwardly through guide ducts 14 are 
generally shown by arrows 17, and is led off through risers and gas 
collecting mains (not shown) which are maintained at a relatively lower 
pressure. Thus, the natural pressure gradient of the overall installation 
is utilized, along with outer sealing strips 10 to prevent the escape of 
the gas from ducts 14. The inner sealing strip 9 has an elasticity, 
flexibility and configural shape such that, upon an increase of the gas 
pressure within the oven chamber 2 and the gap 15, the inner sealing strip 
9 is urged with an increased force against the door frame surface 11 or 
12. This reduces the amount of the high pressure gas entering through the 
inner sealing strip 9 into the guide duct 14, and thereby additionally 
reduces the pressure within the guide duct which acts on the outer sealing 
strip 10. In other words, as shown in all of the illustrated embodiments, 
the inner sealing strip 9 has a substantially Z-shaped transverse 
cross-sectional configuration, including a transverse web which extends 
inwardly toward gap 15. Accordingly, the gas pressure in oven chamber 2 
and gap 15 always act on the interior surfaces of the inner sealing strip 
9 in a manner such as to force the inner sealing strip 9 more firmly 
against the door frame. 
After coke oven door 1 is opened, sealing strips 9 and 10 and guide ducts 
14 can be cleaned in a simple manner since the ducts 14 are completely 
open when the door is in this position. 
It can be seen from the described embodiments of FIGS. 1-3 that the 
cross-sectional configuration of guide ducts 14 can be dimensioned within 
wide limits to provide maximum effectiveness of removing through the ducts 
14 the gas volume generated adjacent gaps 15. 
It will be apparent that numerous further embodiments of the specific seal 
construction are to be considered to be within the scope of the invention. 
For example, outer sealing strip 10 may have other shapes that contribute 
to the cross-sectional configuration of the guide duct. In particular, 
strip 10 may be Z-shaped similar to the shape of strip 9.