Method for regenerating filter and apparatus thereof
First Claim
1. A method for regenerating a filter in a coal gasification system for capturing char present in exhaust gas at an exhaust gas passage communicating with an exhaust gas source including a coal gasification furnace, the regeneration method comprising the steps of:
- filling the filter with an inactive gas having an oxygen concentration of less than 5 vol. %;
heating the filter so that the filter temperature is maintained at 400 to 450°
C.;
feeding into the filter ashing gas which is adjusted to have an oxygen concentration of 5 to 15 vol. %, thereby ashing the char in the filter,measuring the oxygen concentration in the ashing gas at a filter outlet; and
controlling at least one of flow and oxygen concentration in the ashing gas so that the oxygen concentration measured at the filter outlet reaches a preset target concentration.
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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.
50 Citations
14 Claims
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1. A method for regenerating a filter in a coal gasification system for capturing char present in exhaust gas at an exhaust gas passage communicating with an exhaust gas source including a coal gasification furnace, the regeneration method comprising the steps of:
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filling the filter with an inactive gas having an oxygen concentration of less than 5 vol. %; heating the filter so that the filter temperature is maintained at 400 to 450°
C.;feeding into the filter ashing gas which is adjusted to have an oxygen concentration of 5 to 15 vol. %, thereby ashing the char in the filter, measuring the oxygen concentration in the ashing gas at a filter outlet; and controlling at least one of flow and oxygen concentration in the ashing gas so that the oxygen concentration measured at the filter outlet reaches a preset target concentration. - View Dependent Claims (2)
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3. A filter regeneration apparatus of a coal gasification system having a filter for capturing char present in exhaust gas at an exhaust gas passage communicating with an exhaust gas source including a coal gasification furnace;
- the filter regeneration apparatus comprising;
temperature measuring means for measuring an internal temperature of the filter; filling means for filling the filter with inactive gas having oxygen concentration of less than 5 vol. %; heating means for heating the filter which is filled with the inactive gas based on the measured internal temperature of the filter so that the internal temperature of the filter is maintained at 400 to 450°
C.;oxidizing means for oxidizing char inside the filter by feeding ashing gas which is adjusted to have oxygen concentration of 5 to 15 vol. % into the filter; O2 concentration measuring means for measuring oxygen concentration in the ashing gas at a filter outlet; and a controller for controlling at least one of a flow of the ashing gas and an oxygen concentration in the ashing gas so that a measured value of the oxygen concentration reaches a preset target concentration; wherein the filter regeneration apparatus is integrated in a coal gasification combined power generation unit. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
- the filter regeneration apparatus comprising;
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12. A filter regeneration apparatus of a coal gasification system having a filter for capturing char present in exhaust gas at an exhaust gas passage communicating with an exhaust gas source including a coal gasification furnace;
- the filter regeneration apparatus comprising;
temperature measuring means for measuring an internal temperature of the filter; filling means for filling the filter with inactive gas having oxygen concentration of less than 5 vol. %; heating means for heating the filter which is filled with the inactive gas based on the measured internal temperature of the filter so that the internal temperature of the filter is maintained at 400 to 450°
C.;oxidizing means for oxidizing char inside the filter by feeding ashing gas which is adjusted to have oxygen concentration of 5 to 15 vol. % into the filter; O2 concentration measuring means for measuring oxygen concentration in the ashing gas at a filter outlet; and a controller for controlling at least one of a flow of the ashing gas and an oxygen concentration in the ashing gas so that a measured value of the oxygen concentration reaches a preset target concentration;
wherein the filter is in fluid communication with the coal gasification system to receive the gas containing residual char. - View Dependent Claims (13)
- the filter regeneration apparatus comprising;
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14. A filter regeneration apparatus comprising:
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a filter for capturing char present in exhaust gas; an exhaust gas passage fluidly interconnecting the filter with an exhaust gas source including a coal gasification furnace; and a filter regenerating arrangement comprising; heating means for heating the filter; an oximeter for measuring oxygen concentration at an inlet of the filter; oxygen adjusting means for adjusting an oxygen concentration in gas entering the filter; temperature measuring means for measuring a temperature of the filter; a CO2 meter for measuring a CO2 concentration at a filter outlet; and a controller for controlling 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, controlling the oxygen adjusting means so that oxygen concentration in the gas reaches a target oxygen concentration of 5 to 15 vol. % based on the measured oxygen concentration, and adjusting the oxygen adjusting means to cut off gas being supplied to the filter from the coal gasification furnace to adjust the oxygen concentration when the measured CO2 concentration inputted from the CO2 meter reaches a preset target CO2 concentration.
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Specification