Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Reexamination Certificate
1998-10-13
2002-05-14
Tran, Hien (Department: 1764)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
C422S172000, C422S173000, C422S174000, C422S178000, C055S523000
Reexamination Certificate
active
06387335
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a soot treating apparatus for a dust collector, which is capable of collecting soot from exhaust gasses of engines equipped for the performance tests, before the exhaust gasses are discharged to the atmosphere. More particularly, this invention relates to an apparatus for burning soot collected by the dust collector.
2. Description of the Related Art
The present inventors filed the patent application which is directed to this kind of the soot treating apparatus (Unexamined Published Japanese Patent Application No. 6(1994)-317137). As shown in
FIG. 2
, this apparatus comprises a filter
2
disposed in an exhaust gas duct
1
through which the exhaust gasses pass, and a hopper
3
disposed on a lower portion of the filter
2
. A normally-open type damper
1
a
is disposed in the duct
1
on an inlet side of the filter
2
, and a normally-open type damper
1
b
is disposed in the duct
1
on an outlet side of the filter
2
. In the duct
1
on an exhaust gas-downstream side of the filter
2
is disposed a backwashing air conduit
4
for introducing a compressed air thereto, and a normally-closed type valve
4
a
is disposed in the air conduit
4
. A combustion pipe
5
is connected to a lower end of the hopper
3
, and a heater
6
is disposed around the combustion pipe
5
. A combustion medium
7
is inserted into the combustion pipe
5
where the heater
6
is disposed. A chamber
8
is disposed on a lower end of the combustion pipe
5
. And a filter
8
a
is disposed in the chamber
8
. An air blowing pipe
9
a
is disposed on an upper portion of the combustion pipe
5
, and an air blowing pipe
9
c
is connected to the air blowing pipe
9
a
through a valve
9
b
. A blower
9
e
is connected to the air blowing pipe
9
c
through a heat exchanger
9
d
which is disposed around the combustion pipe
5
.
When the soot is burned by the above-mentioned apparatus, the combustion medium
7
in the combustion pipe
5
is heated up by the heater
6
. The damper
1
b
is closed, and the blower
9
e
is operated. After that, the valve
4
a
is opened only in a short time, then the compressed air is blown against the filter
2
through the air conduit
4
. The soot deposited in the filter
2
is dropped on to the hopper
3
. The soot
10
deposited on to the hopper
3
is transferred to the combustion pipe
5
by the air blown from the air blowing pipe
9
a
. The soot
10
transferred to the combustion pipe
5
is collected by the combustion medium
7
, where the soot is burned due to the heat of the heater
6
to be made into the ashes. The combustion medium
7
allows the ashes of the soot
10
and air to pass therethrough. Most of the ashes are collected in the chamber
8
, whereby the air including the ashes and blown from the air blowing pipe
9
a
is purified by the filter
8
a
to thereby be discharged to the atmosphere.
In the conventional soot treating apparatus for the dust collector, most of the ashes of the soot passing through the combustion medium store in the chamber and the rest of the ashes is collected by the air filter. Accordingly, there has been a problem that the air filter is incapable of collecting the ashes effectively and completely. Also, in the above-mentioned apparatus, it has been troublesome to take out the ashes collected in the chamber therefrom.
SUMMARY OF THE INVENTION
It is, therefore, an object of the invention to provide a soot treating apparatus for a dust collector, which is capable of collecting the ashes of the soot effectively and completely burned by the combustion medium.
It is, another object of the invention to provide a soot treating apparatus for a dust collector, which is capable of discharging the combustion gasses directly to the atmosphere, and dumping the collected ashes easily.
The invention according to a first embodiment is, as shown in
FIG. 1
, directed to a soot treating apparatus for a dust collector, comprising a filter
12
disposed on a passage
11
through which exhaust gasses pass for collecting soot included in the exhaust gasses, a hopper
13
disposed on a lower portion of the filter
12
, a backwashing means for introducing a compressed air into the filter through an exhaust gas-downstream side of the filter
12
to drop the soot deposited in the filter
12
on to the hopper
13
, a combustion pipe
15
connected to a lower end of the hopper
13
, an air supplying means for supplying a combustion air into the combustion pipe
15
, a combustion medium
30
of heat-resistant porous ceramic inserted into the combustion pipe
15
, which is capable of collecting the soot
10
arriving at the combustion pipe
15
and of letting the combustion air pass therethrough, a heater
16
disposed around the combustion pipe
15
, being adapted to burn the soot collected by the combustion medium
30
, a heat exchanger
17
disposed around the heater
16
, and an air filter disposed on gas-downstream side of the combustion medium
30
, which is capable of collecting the burned ashes coming from the combustion medium
30
and of letting the combustion gasses pass therethrough, wherein the air supplying means is comprised of an air supplying blower
18
b
, an air nozzle
18
a
for jetting an air toward the combustion medium
30
from a side of the hopper, and an air pipe passage
18
c
disposed so as to pass through the heat exchanger
17
for connecting the blower
18
b
and the air nozzle
18
a
to each other, characterised in that the combustion medium
30
is capable of collecting the burned ashes as well as the soot
10
, and the air filter is comprised of a plate
31
of heat-resistant porous ceramic, which is detachably disposed on the gas-downstream end of the combustion medium
30
so as to cross with the combustion pipe
15
, having pores of average diameter from 300 to 700 &mgr;m.
When the soot is burned to be treated, the soot deposited in the filter
12
by introducing the compressed air thereto by the air conduit
14
is dropped on to the hopper
13
. The soot is adhered to the combustion medium
30
due to the combustion air supplied to the combustion pipe
15
, and burned due to the heat of the heater
16
. Most of the ashes generated due to the combustion remain in the combustion medium
30
. The plate
31
prevents the combustion medium
30
from dropping from the combustion pipe
15
, and also collects the rest of the ashes reliably which come from the combustion medium
30
after combustion. A clean air passing through the combustion medium
30
and the plate
31
, which does not include the soot or the ashes, is discharged to the atmosphere. When the ability in which the combustion medium
30
can collects the soot or the ashes is lowered, the combustion medium
30
is renewed. Also, when the ability in which the plate
31
can collects the ashes is lowered, the plate
31
is renewed.
The air pipe passage
18
c is warmed up by the heat exchanger
17
by using the heat of the heater
16
effectively. The combustion air is warmed through the air pipe
18
c
to be jetted from the air nozzle
18
a
as the warm wind. Whereby, the combustion efficiency of the soot at the combustion medium
30
is improved.
The combustion medium
30
is comprised of heat-resistant porous ceramic having pores of average diameter from 20 to 700 &mgr;m. As porous ceramic, there are exemplified alumina and cordierite, etc., which are greater in heat-resistance. It is preferable that porous ceramic is of a pellet-like one or a chip-like one or a chip-like one which is greater in specific surface area. Otherwise, porous ceramic may be of a honeycomb-like one. The former pellet-like or chip-like porous ceramic has preferably pores of average diameter from 50 to 150 &mgr;m, more preferably 100 &mgr;m. The latter honey-comb-like porous ceramic has preferably pores of average diameter from 400 to 600 &mgr;m, more preferably 500 &mgr;m.
As described above, according to the invention, the soot which is dropped from the filter can be burned effectively by the short combustio
Ichikawa Jun
Igarashi Toshio
Hino Motors Ltd.
Reed Smith LLP
Tran Hien
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