Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Reexamination Certificate
2000-02-17
2002-03-12
Ramsey, Kenneth J. (Department: 2879)
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
C029S592100
Reexamination Certificate
active
06354896
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method of assembling a movable electrode type electric dust collecting apparatus, particularly, to a method of assembling a movable electrode typed electric dust collecting apparatus comprising a large number of discharge frames that are allowed to hang a predetermined distance apart from each other within a casing, and a large number of movable electrodes each consisting of a pair of endless chains and a plurality of dust collecting grids that are attached to said pair of endless chains and arranged to form a loop as a whole, said movable electrodes being arranged to be rotated around every other discharge frame.
BACKGROUND ART
A movable electrode typed electric dust collecting apparatus of this kind is known as an electric dust collecting apparatus for removing particles of soot from the waste gas generated from, for example, boilers used in a thermoelectric power plant and from various furnaces in an iron mill. The construction of the movable electrode typed electric dust collecting apparatus, which is widely employed, is schematically shown in
FIGS. 4
to
8
.
As shown in
FIG. 4
, a movable electrode typed electric dust collecting apparatus
10
comprises a casing
12
, a hopper
13
arranged in a lower portion of the casing
12
, a large number of discharge frames
14
arranged within the casing
12
, and a large number of movable electrodes
15
. A waste gas
17
is introduced through an inlet of a fire flue
16
into the casing
12
, and the dust is removed from the waste gas
17
within the casing
12
by the principle of the electric dust collection. Then, the clean waste gas is discharged from within the casing
12
to the outside through an outlet of a fire flue
18
. The particles of soot removed from the waste gas
17
drop into the hopper
13
and are taken out of the hopper
13
by a mechanism (not shown) through a discharge port
19
.
FIG. 5
is a cross sectional view as viewed in the direction denoted by arrows A in FIG.
4
. As shown in the drawing, a large number of discharge frames
14
are allowed to hang a predetermined distance apart from each other within the casing
12
. Also, a large number of movable electrodes
15
are arranged to be moved around every two discharge frames
14
.
FIG. 6
is a side view showing the mounting structure of the discharge frame
14
shown in FIG.
6
.
FIG. 7
is a cross sectional view as viewed in the direction denoted by arrows B in FIG.
6
. The discharge frame
14
includes a large number of discharge wires
21
attached to a lattice-shaped frame body
20
. An upper bracket
27
and a lower bracket
28
each extending from each of the discharge frames
14
are mounted an upper stage beam
25
and a lower stage beam
26
of a frame
24
hanging from an insulating tube
22
via a hanging rod
23
to permit the discharge frames
14
to be kept hung. Incidentally, reference numerals
29
and
30
denote a driving wheel and a lower roller, respectively, for driving the movable electrode
15
.
FIG. 8
is an oblique view showing in detail the construction of the movable electrode
15
. As shown in the drawing, a pair of endless chains
31
,
31
are stretched between the driving wheel
29
in the upper portion and the lower roller
30
. A plurality of dust collecting grids
32
are attached to these endless chains
31
,
31
in the central portions
33
in the width direction of the dust collecting grids
32
to form a loop as a whole. A shaft
34
of the driving wheel
29
is rotated by a driving mechanism (not shown), and the rotation of the shaft
34
is transmitted through the paired endless chains
31
,
31
by the driving wheel
29
, result in a loopformed-dust collecting grids
32
allowing to be rotated around every other discharge frame
14
.
In general, the height of the entire movable electrode typed electric dust collecting apparatus
10
reaches 20 to 30 meters, making it difficult to assemble the entire structure in a factory. Therefore, in assembling the dust collecting apparatus
10
, it was customary in the past to build first the casing
12
in the site of installing the apparatus
10
, followed by mounting the discharge frames
14
and the movable electrodes
15
within the casing
12
.
However, each of discharge frames
14
is suspended by the hanging rods
23
in general 300 to 400 mm apart from each other. What should be noted is that it is necessary to attach to the endless chain
31
of the movable electrode
15
and the dust collecting grid
32
in the small space intermediate between adjacent discharge frames
14
,
14
that are incorporated to fill the entire space within the casing
12
. A small working space prevent shopman from mounting efficiently these discharge frame
14
and movable electrode
15
.
Many steps are required for mounting the discharge frame
14
and the movable electrode
15
within the casing
12
, giving rise to various problems. A long hard working conditions causes shopman and operator trouble in operation.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method of assembling a movable electrode type electric dust collecting apparatus, which permits performing efficiently the mounting operation of the discharge frames
14
and the movable electrodes
15
within the casing
12
.
According to a first aspect of the present invention, there is provided a method of assembling a movable electrode type electric dust collecting apparatus including a large number of discharge frames that are allowed to hang a predetermined distance apart from each other within a casing and a large number of movable electrodes each consisting of a pair of endless chains and a plurality of dust collecting grids that are attached to said pair of endless chains and arranged to form a loop as a whole, said movable electrodes being arranged to be rotated around every two discharge frames, characterized in that the plural discharge frames are mounted first in predetermined positions within the casing, followed by mounting the plural movable electrodes.
The present invention is featured in that, for mounting the discharge frames and the movable electrodes, the discharge frames and the movable electrodes are introduced into predetermined positions within the casing through the open portion of the hopper before the hopper is mounted in a lower portion of the casing, followed by mounting the hopper.
The present invention is also featured in that a rail is arranged on the upper surface of the casing, and a gate-shaped movable crane capable of running along the rail is utilized for mounting the discharge frames and the movable electrodes in predetermined positions.
The present invention is also featured in that the process for mounting the movable electrode comprises the steps of forming first the movable electrode in a linear form, pulling up both end portions of the linear movable electrode simultaneously or separately through the open portion of the hopper to a ceiling position within the casing, and joining the both end portions of the linear movable electrode to each other in the ceiling position to form a loop of the movable electrode.
The present invention is further featured in that the process of forming the movable electrode comprises the steps of forming first the movable electrode in the form of two parts substantially equal to each other in length, bringing these parts of the movable electrode to predetermined positions in a lower portion of the casing, pulling up the upper end portion of each of the two parts of the movable electrode through the open portion of the hopper to a ceiling position within the casing, joining the upper end portions of the two parts of the movable electrode to each other in the ceiling position, and joining the lower end portions of the two parts of the movable electrode to each other in a lower position within the casing to form a loop of the movable electrode.
According to the present invention, in assembling a movable electrode typed electric dust collecting apparatus including a large num
Hashimoto Michio
Morita Kazunori
Hitachi Plant Engineering & Construction Co. Ltd.
Ramsey Kenneth J.
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