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Патент USA US2405363

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2,465,353
l.. B. LìNDEMuTl-a
CHECKER FOR OPEN HEARTHREGENERATIVE FURNACES
Filed March 29, 1944
'.5'l Sheets-Sheet 2
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INVENTOR.
WITNESSES.
cà o.
BY @___,v‘m
m;
,1946.
1_. B. LINDEMUTH
CHECKER FOR OPEN HEARTH REGENERÀTIVE FURNACES
Filed March 29. 1944
3 Sheets-Sheet 3
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INVENTOR. -
Patented Aug. 6, 1,946
2,405,363
’ ‘
ÉÀTENT OFFICE
¿UNITED STATE
2,405,363
CHECKER FOR OPEN-HEARTH REGENERA
TIVE FURNACES
Lewis B. Lindemuth, Port Washington, N. Y., as
sig‘nor to Steel Ingot Production, Inc., New
York, N. Y., a corporation of Delaware
Application March 29, 1944, Serial No. 528,524
3 Claims.
(Cl. 263-51)
1
2
The invention relates to checkers for open.
hearth regenerative furnaces, particularly thos
used for making steel.
'
In the operation of an open hearth steel fur
nace much dirt and dust, including fine oxide
I-beam. The horizontal joints of brick forming
the columns in each vertical plane are vertically
offsetfrom the horizontal joints of brick forming
the columns in each adjacent plane so that ther
mal lateral expansion of the brick will not move
particles, is carried by the hot gases to the check
the columns out of alignment and present dust
ers, on horizontal portions of which a substan
tial amount of the dust is deposited. Because of
the character of the dust and the heat to which
receiving ledges. This breaking of the joints is .
preferably eiîected by using half brick or one and
one-half brick at the bottoms'of the columns 1y
it is subjected, deposits of it grow in sponge-like 10 ing in alternate vertical planes thereof and half
fritted form and clog passages through the check
bricks at the tops thereof or at the tops of the
er. This makes it necessary to clean the check
other columns.
ers from time to time, which is diñicult to do
To facilitate the laying of the columns, the hori
except their tops. To clean the passages through
zontal meeting faces of the brick are provided
a checker to the limited extent that this can 15 with interlocking detents of a suitable form to
be done, it is usually necessary temporarilyl to
align brick vertically and also to restrain verti
shut down the furnace.
cally adjacent brick against movement with re
’
As usually constructed, the life of checkers has
lation to each other. However, such detents are
been approximately that of the open hearth steel
preferably omitted from the brick forming the
furnace with which they are associated, and the 20 tops of the columns, such brick having smooth
tops so that they will not be engaged and moved
checkers have been rebuilt when the furnace has
been closed down for reconstruction. A recent
by the cleaners or dust removers which from time
development in the construction of open hearth
to time are moved over the top of the checker.
furnaces is the use of basic brick for their roofs
The invention is illustrated in the accompany
which has extended the lives of the furnaces three 25 ing drawings, of Which Fig. 1 is a horizontal sec
or four times that of those having the usual silica
tional view of a checker, the plane of view being
brick roofs. An object of this invention is to
indicated by the line I--I, Fig. 2; Fig. 2 a verti
provide for such furnaces checkers Whose lives ‘ cal longitudinal sectional View taken on the'line
will be that of the furnace so that it will be
II-II, Fig. l; Fig. 3 a vertical transverse sectional
unnecessary to close the furnace down for the 30 View taken on the line III-III, Fig. l; and Figs.
purpose of rebuilding its checkers.
4 and 5 perspective views of full size and half size
The invention provides for an open hearth re
brick used in forming the checker.
generative furnace a checker constructed of brick
The checker is built within end walls l and
that are so shaped and laid as to form a plurality
2, and sidewalls 3 and li, and has a bottoml 5
of Vertical flues which extend from the top to the 35 and a top E. The length of the checker between
bottom of the checker in such a continuous fash
its end walls I and 2, and its width between its
ion as to have no horizontal ledges on which dust
side walls 3 and t, as well as its height, may vary
can deposit, except the top of the checker which
according to the requirements of service. The
can readily be cleaned from time to time with
top of end Wall l is provided with a gas or an
` out interrupting the operation of the furnace. 40 air inlet l connecting with a furnace, which on
The checker is constructed of brick laid in con
reversal of the furnace becomes an outlet for
tinuous vertical columns which are arranged in
products of combustion, and end wall Z is pro
parallel planes, the columns lying in each plane
having their adjacent ends spaced from each
other. 'I'he ends of columns lying in adjacent
planes overlap each other so that a continuous
vertical flue is formed between the ends'of a
pair of adjacent columns lying in one vertical
plane and the sides of two columns lying in adja
cent vertical planes.
While the flue-forming columns may be formed
of plain brick, they are advantageously formed
of brick having vertical ribs lat their ends, the
prefered form of brick having two vertical ribs
vided with a gas outlet 8 for products of com
bustion which on reversal of the furnace becomes
Extending longitudinally
45 a gas or an air inlet.
of the checker and resting upon its bottom 5 there
is a wall li) which is provided with cross fiues
l l and whose upper portion supports the adjacent
ends of arches I2 that are supported at their other
ends by walls 3 and 4. Resting on the tops of
these arches there are blocks I3 on whose upper
faces flue-forming columns rest.
Except for the top and bottom courses of some l
columns in the checker, each column is formed
at each of its ends so that itis shaped like an 55 of brick l5 of the I-beam shape shown particu
2,405,363
3
4
larly in Fig. 4, the brick having a flat main body
of rectangular shape and being provided at both
sides of each end With vertical ribs I1. The tops
and is moved over the top of the checker. If the
upper faces of the brick forming the tops of the
columns were provided with detents, the move
ment of the cleaning ytool would be liable to en
and bottoms of the brick are provided with inter
locking detents of suitable form which may be a
gage the detents and move the upper courses of
brick. This would throw the iiues out of align
transverse groove I8 on the top and a transverse
ment and present dust-forming ledges at places
projection I9 on the bottom of each brick. The
which are not readily accessible to cleaning.
top brick of each column having a half brick at
The columns lying in each vertical plane there
its lower end may be the same as the brick i5
except that the upper face is plain, or it may 10 of being spaced at their ends from veach other,
thermal expansion of the brick horizontally in
be a half brick 2!! such as shown in Fig. 5. Brick
the plane of the columns does not throw the col
20 is the same as the brick I5 except that it is
umns out of alignment because each brick is free
half the height and its top is plain, or in other
to expand lengthwise. Expansion of the brick
words, not provided with a groove. While various
size brick I 5 may be used, a suitable full size 15 transversely of the checker is transmitted from
one column to another through the vertical ribs
brick may be 131/2 inches long, 6 inches high and
at the end of the brick, but the staggering of the
2 inches thick throughout its main body, its end
joints of the columns lying in alternate vertical
ribs I'I extending one-half inch from the face of
planes precludes such thermal expansion from
the brick and each having a face 11/2 inches in
Width. When brick of this size are used they form 20 throwing the columns out of alignment.
According to the provisions of the patent stat
flues that are e x lOl/2 inches in cross section.
utes, I have explained the principle and operation
By using brick of this form and thickness the
of my invention, and have illustrated and de
entire volume of the brick is elîectively used for
scribed what I now consider to represent its best
absorbing and giving off heat.
embodiment. However, I desire to have it under
The brick just explained are laid in vertical
stood that, Within the scope of the appended
columns arranged in parallel vertical planes, al
claims, the invention may be practiced otherwise
ternate planes thereof being indicated by the dot
than specifically illustrated and described.
and dash lines 25 and 26 on Figs. 1 and 3. The
I claim:
end ribs Il of the brick forming each column in
1. A checker for an open hearth regenerative
cach vertical plane 25 overlie and contact with 30
furnace, comprising flat brick having lateral ribs
the faces of the like ribs at the ends of the brick
at their ends laid in continuous vertical columns
forming the columns in each adjacent vertical
arranged in parallel vertical planes with said
plane
Thus a continuous and uninterrupted
ribs extending vertically, »the columns in each‘ said
vertical flue 21 is formed between the adjacent
plane having their adjacent ends spaced from
ends of adjacent columns lying in one vertical
each other and having said end ribs overlying
plane and the sides of two columns lying in ad
and contacting with those of the columns lying in
jacent vertical planes. As shown in Figs. 2~ and 3,
each adjacent plane to form a plurality of verti
«there is a half brick 2li at the bottom of each
cal smooth-Wall ñues extending continuously
column lying in alternate vertical planes thereof,
from the top to the bottom oi the checker, arches
and a half brick 2B at the tops of such columns.
below said columns extending at Vright angles to
Th‘e other columns are formed of full size brick
said vertical planes thereof, and blocks vresting
l5, except that the top brick in each such column
upon the tops of said arches and supporting the
may be plain instead of being provided with a
ribbed ends of said columns, said blocks having
groove.
'
bases of the same Width as the tops of said arches
To eliminate dust-receiving ledges on the tops
and having tops of the same widths as‘said ribs
of the column supporting arches I2, the blocks I3
and having tapered sides between their bases
that rest upon these arches have bases of the
and column-supporting top.
same width as th‘e arches and have tops the same
Between the tops and bases of these blocks their 1
sides are tapered as shown in Fig. 2, the taper
being so steep that dust Will not deposit on their
faces. Also, to prevent dust from depositing
upon the top of Wall I il between arches I2, tri
angular-ly shaped blocks 3G are placed upon the
top of this Wall, th'e base of such blocks being of
the same Width as the thickness of Wall Ill. Thus
from the top to the bottom of the checker the
dues 2'! are continuous and their walls are free
from horizontal dust-receiving ledges. Prefer
ably there are no cross ilues connecting these
vertical ilues.
Because of the interlocking `detents IS and IS
formed on the horizontal faces of the brick, the
columns may readily be laid with unskilled help,
and in the upper courses of the columns these
interlocking detents restrain the brick against
moving longitudinally with relation to each other
when a cleaning tool is moved over the top of the
checker for removing dust deposited on it. As is
well known, cleaning tools for this purpose are
'
2. A checker for an open hearth regenerative
width as ribs I'I of the column-forming brick.
furnace, comprising bricks laid in continuous ver
tical columns arranged in parallel vertical planes,
the columns in each said plane having their ad
jacent ends spaced from each other and having
at their ends vertical sides that are parallel to
said vertical planes, said vertical sides of each
column overlapping the like sides at the ends of
columns in each adjacent plane to formv a, plu
rality of vertical flues extending continuously
from the top to the bottom of the checker, each
column forming said iiues being free thermally
to expand and contract laterally in the direction
of said vertical plane in which it lies, the hori
zontal joints of the bricks forming the columns in
each said vertical plane being vertically offset
from the horizontal joints of the bricks forming
the columns in each adjacent plane, the tops of
the columns being smooth and lying in a hori
zontal plane, and the horizontal meeting faces of
the bricks that constitute each‘ column being pro
70 vided with interlocking detents aligning the
bricks vertically and restraining vertically adja
usually formed of pipes, each having a laterally
cent bricks against lateral movements with rela
extending perforated head for discharging on the
tion to each other.
.'
top of the checker compressed air led through the
3. A checker for an open hearth regenerative
pipe. The cleaning h'ead of the tool rests upon 75 furnace, comprising flat bricks having lateral
2,405,363
5
¿
ribs at their ends laid in continuous vertical col
umns arranged in parallel vertical planes with
said ribs extending in vertical alignment at the
ends of each column and h'aving their side faces
lying in planes parallel to said vertical planes, the
columns lying in each said vertical plane having
their adjacent ends spaced from each other and
having said side faces of said ribs overlapping -the
like faces of the ribs at the ends of columns in
each adjacent plane to form a, plurality of verti
cal ñues extending continuously from the top to,
the bottom of the ch'ecker, each column forming
said iiues being free thermally to expand and con
6
ltract laterally in the direction `of said vertical
plane in which it lies, the horizontal joints of the
bricks forming the columns in each said vertical
plane being vertically oiïset from the horizontal
joints of the bricks forming the columns in each'
adjacent plane, the tops of the columns being
smooth and lying in a horizontal plane, and the
horizontal meeting faces of the bricks that cón
stitute each column being provided with inter
locking detents aligning the bricks vertically and
restraining vertically adjacent bricks against lat
eral movements with relation to each oth'er.
LEWIS B. LINDEMUTH.
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