Furnaces – With exhaust gas treatment means – Afterburning means
Reexamination Certificate
2003-05-30
2004-07-06
Rinehart, Kenneth B. (Department: 3749)
Furnaces
With exhaust gas treatment means
Afterburning means
C110S303000, C110S309000, C110S16500A
Reexamination Certificate
active
06758149
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a refuse incinerator for burning mainly refuse and more particularly to a small refuse incinerator capable of extinguishing smoke and odor accompanying combustion of refuse.
2. Description of the Related Art
Conventionally, a technology for burning exhaust gas secondarily with an after-burner in order to extinguish smoke and odor of that exhaust gas generated when refuse is burnt has been known. For example, according to Japanese Patent Application Laid-Open No.HEI7-225015, a secondary combustion burner is disposed in a secondary combustion chamber provided adjacent a primary combustion chamber and the exhaust gas generated in the primary combustion chamber is burnt completely with the secondary combustion burner so as to extinguish its smoke.
Further, another technology for extinguishing smoke by secondary heating with far infrared ray from a far infrared ray irradiation material disposed within an incinerator has been also known. For example, according to Japanese Patent Application Laid-Open No.HEI7-324719, a net cylinder is disposed within the combustion chamber of a furnace and a far infrared ray irradiation material is loaded between the net cylinder and an inner wall of the combustion chamber. In this furnace, refuse is burnt within the net cylinder and generated exhaust gas passes through far infrared ray irradiation material layers and rises, so that the exhaust gas is burnt completely and discharged into the air.
However, the refuse incinerator described in the former publication requires the secondary combustion chamber and the secondary combustion burner and consequently, the size thereof is increased and its combustion cost rises. Thus, this refuse incinerator is unsuitable for a small refuse incinerator. In case of the refuse incinerator described in the latter publication, because a stack is provided just above the combustion chamber, exhaust gas passes upward quickly and is discharged out without being subjected to sufficient irradiation of the far infrared ray, so that the exhaust gas is not burnt completely, thereby leaving smoke.
To solve such a problem, as shown in
FIG. 9
, a refuse incinerator
101
disclosed in Japanese Patent Publication No.2001-141216 (U.S. Pat. No. 6,325,000B1), comprises a furnace main body
102
, a combustion chamber
105
disposed below the furnace main body
102
, a heat insulation wall
103
having a first far infrared ray irradiation body disposed so as to surround the furnace main body
102
and the combustion chamber
105
, a heat exchanger
104
disposed so as to surround the heat exchanger
103
, an inner smoke path
107
formed between the heat insulation wall
103
and the furnace main body
102
, an outer smoke path
109
formed between the heat insulation wall
103
and the heat exchanger
104
and communicating with the inner smoke path
107
, a heat insulation member
110
, which is a second far infrared ray irradiation body disposed above a connecting portion
108
between the inner smoke path
107
and the outer smoke path
109
and exhaust gas outlets
106
disposed in the furnace main body
102
such that it faces the connecting portion
108
.
Therefore, in the refuse incinerator
101
, as indicated with a dot and dash line in
FIG. 9
, exhaust gas is discharged into the connecting portion
108
from the exhaust gas outlets
106
and then, heated by the far infrared ray irradiated from the heat insulation wall
103
and the heat insulation material
110
in the connecting portion
108
and high temperature combustion gas from the combustion chamber
105
. Further, because a top portion of the connecting portion
108
is closed so that down draft of air is formed, heat is unlikely to escape. For the reason, exhaust gas is heated to high temperatures, so that the smoke and odor are dissolved and extinguished. Additionally, because no secondary burner is required, the size of the refuse incinerator can be reduced.
However, although exhaust gas is discharged directly into the connecting portion
108
in the refuse incinerator
101
, the temperature of the connecting portion
108
is not raised sufficiently in a while just after the incineration of the refuse is started, because the connecting portion
108
is located far from the combustion chamber
105
. Consequently, the exhaust gas is not heated to a sufficiently high temperature and therefore, there is such a fear that the smoke and odor of the exhaust gas cannot be extinguished.
SUMMARY OF THE INVENTION
The present invention intends to solve the above-described problem and therefore provides a refuse incinerator capable of extinguishing smoke and odor of exhaust gas generated from incineration of refuse just after the incineration of the refuse is started.
To achieve the above object, according to an aspect of the present invention, there is provided a refuse incinerator comprising: an incineration furnace containing a furnace main body and a furnace lid which is put on the furnace main body; a combustion chamber provided below the furnace main body; a heat insulation wall provided so as to surround the furnace main body and the combustion chamber; a heat exchanger provided so as to surround the heat insulation wall; an exhaust gas chamber whose bottom wall contains at least a part of the furnace lid; an exhaust gas outlet provided in a portion of the incineration furnace, the portion facing the exhaust gas chamber; an exhaust gas introduction pipe communicating between the exhaust gas chamber and the combustion chamber; a first smoke path formed between the furnace main body and the heat insulation wall and whose bottom portion is connected to the combustion chamber; and a second smoke path formed between the heat insulation wall and the heat exchanger and whose top portion is connected to the top portion of the first smoke path.
According to another aspect of the present invention, the refuse incinerator may further comprise a box body including a top wall portion provided with a door body which can be opened/closed and a peripheral wall portion, the incineration furnace being accommodated within the box body, the heat exchanger being provided within the box body, the exhaust gas chamber being formed at a top portion within the box body, the refuse incinerator further comprising a third smoke path, formed between the heat exchanger and the peripheral wall portion and whose bottom portion is connected to the bottom portion of the second smoke path and having a discharge port.
Preferably, the exhaust gas outlet is provided on the furnace lid.
Further preferably, the refuse incinerator further comprises an air supply unit and an air supply pipe connected to the air supply unit, wherein a front end portion of the air supply pipe is inserted into the exhaust gas introduction pipe and an air spouting port which is an outlet of the air supply pipe is disposed within the exhaust gas introduction pipe such that it faces an exhaust gas combustion chamber outlet which is an outlet of the exhaust gas introduction pipe.
Still further preferably, the refuse incinerator further comprises an air spouting pipe connected to the air supply unit, wherein an ash discharge port is provided in the bottom portion of the furnace main body and the front end portion of the air spouting pipe passes through the ash discharge port and is projected into the-furnace main body.
REFERENCES:
patent: 3043249 (1962-07-01), Hebert et al.
patent: 4213404 (1980-07-01), Spaulding
patent: 5184539 (1993-02-01), Oiwa
patent: 5632197 (1997-05-01), Lubawy et al.
patent: 6073541 (2000-06-01), Oiwa
patent: 6325000 (2001-12-01), Furuta
patent: 1246923 (1967-08-01), None
patent: 2660429 (1982-03-01), None
patent: 07-225015 (1995-08-01), None
patent: 07-324719 (1995-12-01), None
European Search Report dated Aug. 14, 2003.
Furuta Satoshi
Hirano Hideo
Oiwa Masatoshi
Meito Corporation
Rader & Fishman & Grauer, PLLC
Rinehart Kenneth B.
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