Claims
- 1. A method for treating an exhaust gas from a combustion furnace comprising the step of passing the exhaust gas through a bag filter, said method further comprising the steps of:measuring the concentration of a chlorinated aromatic compound selected from the group consisting of chlorobenzenes and chlorophenols in said exhaust gas; and adjusting the operating temperature of said bag filter based on the measured concentration of said chlorinated aromatic compound in order to decrease the concentration of said chlorinated aromatic compound in said exhaust gas.
- 2. The method according to claim 1, wherein said adjusting step employs feedback control.
- 3. The method according to claim 2, wherein said feedback control adjusts the operating temperature of said bag filter based on a periodically measured concentration of said chlorinated aromatic compound, so as to make the concentration of said chlorinated aromatic compound equal to or less than a preset level.
- 4. A method for treating an exhaust gas from a combustion furnace comprising the step of passing the exhaust gas through a bag filter, said method further comprising the steps of:measuring the concentration of a chlorinated aromatic compound selected from the group consisting of tetrachlorobenzene and pentachlorobenzene in said exhaust gas; and adjusting the operating temperature of said bag filter based on the measured concentration of said chlorinated aromatic compound in order to decrease the concentration of said chlorinated aromatic compound in said exhaust gas.
- 5. The method according to claim 4, wherein said adjusting step employs feedback control.
- 6. The method according to claim 5, wherein said feedback control adjusts the operating temperature of said bag filter based on a periodically measured concentration of said chlorinated aromatic compound, so as to make the concentration of said chlorinated aromatic compound equal to or less than a preset level.
- 7. A method for decreasing the concentration of dioxins in an exhaust gas comprising the step of passing the exhaust gas from a combustion furnace through a bag filter, said method further comprising the steps of:measuring the concentration of a chlorinated aromatic compound selected from the group consisting of chlorobenzenes and chlorophenols in said exhaust gas; estimating the concentration of dioxins in said exhaust gas based on the measured concentration of said chlorinated aromatic compound; and adjusting the operating temperature of said bag filter based on the estimated concentration of dioxins to decrease the concentration of dioxins in said exhaust gas.
- 8. The method according to claim 7, wherein said adjusting step employs feedback control.
- 9. The method according to claim 8, wherein said feedback control adjusts the operating temperature of said bag filter based on a periodically measured concentration of said chlorinated aromatic compound, so as to make the estimated concentration of said dioxins equal to or less than a preset level.
- 10. A method for decreasing the concentration of dioxins in an exhaust gas comprising the step of passing the exhaust gas from a combustion furnace through a bag filter, said method further comprising the steps of:measuring the concentration of a chlorinated aromatic compound selected from the group consisting of tetrachlorobenzene and pentachlorobenzene in said exhaust gas; and estimating the concentration of dioxins in said exhaust gas based on the measured concentration of said chlorinated aromatic compound; and adjusting the operating temperature of said bag filter based on the estimated concentration of dioxins to decrease the concentration of dioxins in said exhaust gas.
- 11. The method according to claim 10, wherein said adjusting step employs feedback control.
- 12. The method according to claim 11, wherein said feedback control adjusts the operating temperature of said bag filter based on periodically measured concentration of said chlorinated aromatic compound, so as to make the estimated concentration of said dioxins equal to or less than a preset level.
Priority Claims (5)
Number |
Date |
Country |
Kind |
8-326829 |
Dec 1996 |
JP |
|
9-170222 |
Jun 1997 |
JP |
|
9-315378 |
Nov 1997 |
JP |
|
9-315379 |
Nov 1997 |
JP |
|
9-316683 |
Nov 1997 |
JP |
|
Parent Case Info
This is a continuation of application Ser. No. 09/117,703, filed Aug. 4, 1998, now pending which was filed as PCT/JP97/04474 filed Dec. 5, 1997 the entire content of which is hereby incorporated by reference in this application.
US Referenced Citations (18)
Foreign Referenced Citations (15)
Number |
Date |
Country |
0 611 919 |
Aug 1994 |
EP |
0 616 171 |
Sep 1994 |
EP |
62-46118 |
Feb 1987 |
JP |
63-104554 |
May 1988 |
JP |
4-161849 |
Jun 1992 |
JP |
4-208306 |
Jul 1992 |
JP |
4-288405 |
Oct 1992 |
JP |
5-99411 |
Apr 1993 |
JP |
5-312796 |
Nov 1993 |
JP |
7-332642 |
Dec 1995 |
JP |
8-110027 |
Apr 1996 |
JP |
8-131775 |
May 1996 |
JP |
10-103647 |
Apr 1998 |
JP |
1995-0013977 |
Jul 2001 |
KR |
WO 8806698 |
Sep 1988 |
WO |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan: vol. 1997, No. 06, JP 09 033026; Jun. 30, 1997. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09/117703 |
|
US |
Child |
09/630538 |
|
US |