Method for regenerating filter and apparatus thereof
First Claim
1. A method for regenerating a filter in a coal gasification system for capturing char (unburned matter) present in exhaust gas at an exhaust gas passage communicating with exhaust gas source including a coal gasification furnace, the regeneration method comprising the steps offilling the filter with inactive gas having oxygen concentration of less than 5 vol. %;
- heating the filter so that the filter temperature is maintained at 400 to 450°
C.; and
feeding into the filter the ashing gas which is adjusted to have oxygen concentration of 5 to 15 vol. %, thereby ashing (oxidizing) the char in the filter.
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Accused Products
Abstract
A filter regeneration apparatus of a coal gasification system having a filter for capturing char (unburned matter) present in exhaust gas at an exhaust gas passage communicating with exhaust gas source including a coal gasification furnace, fills the filter container with inactive gas having oxygen concentration of less than 5 vol. % and heat the filter to a target temperature of 400 to 450° C. and feed ashing gas having oxygen concentration of 5 to 15 vol. %, thereby ashing char in the filter. This method and apparatus achieve ashing of char in a safe manner and shortens the time of regenerating the filter by controlling the oxygen concentration in the ashing gas and the filter temperature constantly to reach preset target values.
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Citations
8 Claims
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1. A method for regenerating a filter in a coal gasification system for capturing char (unburned matter) present in exhaust gas at an exhaust gas passage communicating with exhaust gas source including a coal gasification furnace, the regeneration method comprising the steps of
filling the filter with inactive gas having oxygen concentration of less than 5 vol. %; -
heating the filter so that the filter temperature is maintained at 400 to 450°
C.; andfeeding into the filter the ashing gas which is adjusted to have oxygen concentration of 5 to 15 vol. %, thereby ashing (oxidizing) the char in the filter. - View Dependent Claims (2, 3)
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4. A filter regeneration apparatus of a coal gasification system having a filter for capturing char (unburned matter) present in exhaust gas at an exhaust gas passage communicating with exhaust gas source including a coal gasification furnace;
- the filter regeneration apparatus comprising;
filling means for filling the filter with inactive gas having oxygen concentration of less than 5 vol. %; heating means for heating the filter so that the filter temperature is maintained at 400 to 450°
C.;feeding means for feeding into the filter the ashing gas which is adjusted to have oxygen concentration of 5 to 15 vol. %; and setting means for setting cutting-off timing of the ashing gas supply in synchronization with completion of char ashing (oxidizing) in the filter - View Dependent Claims (8)
- the filter regeneration apparatus comprising;
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5. A filter regeneration apparatus of a coal gasification system having a filter for capturing char (unburned matter) present in exhaust gas at an exhaust gas passage communicating with exhaust gas source including a coal gasification furnace;
- the filter regeneration apparatus comprising;
heating means for heating the filter; an oximeter for measuring oxygen concentration at the inlet of ashing gas; ashing gas oxygen adjusting means for adjusting oxygen concentration in ashing gas; temperature measuring means for measuring a temperature of the filter; and a controller for controlling thermal dose of the heating means to heat the filter to 400 to 450°
C. based on inputted filter temperature which is measured by the temperature measuring means and controlling the adjusting means so that oxygen concentration in the ashing gas reaches a target oxygen concentration of 5 to 15 vol. % based on the measured oxygen concentration. - View Dependent Claims (6, 7)
- the filter regeneration apparatus comprising;
Specification