Modulating method and system for kiln firing
OwnerHosagrahar C. Visvesvarayainventor
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Abstract
The invention relates to a method and system for modulating the firing temperature in a rotary kiln. The method comprises determining the absolute content of one or more inorganic constituents present in the coal feed for determining the total ash content in the coal. In the event that the temperature in the kiln is different from the required temperature, then a sweetner fuel is fed to the burner with or without a change in the flow of coal. Alternatively, only the amount of flow of coal to the burner is reduced or increased.
Claims11
A method of modulating the firing of a kiln having a pulverized coal burner comprising the steps of periodically drawing samples of coal from a feed line supplying pulverized coal to the burner;
- preparing a coal feed sample from said samples for an on-line analyzer;
- determining the absolute content of one or more inorganic constituents of ash present in the coal feed sample using said analyzer;
- supplying data corresponding to said content to a process computer along with information related to the temperature in the kiln;
- determining the total ash content in the coal from the data;
- and maintaining the temperature in the kiln uniform by controlling, in response to either a variation in the total ash content of the coal supplied to the burner or a variation in the temperature in the kiln, the addition of a sweetener fuel and the flow of coal to the burner.
A coal quality modulation system for enabling uniformity in the burning zone conditions in a kiln having a feed line for supplying pulverized coal to a multi-channel burner of the kiln, the system comprising an automatic sampler connected to said feed line for periodically drawing samples of coal from the feel line, a sample preparation unit connected to said sampler for preparing a coal feed sample, an on-line analyzer connected to said preparation unit for determining the absolute content of at least one inorganic constituent in the coal feed sample, a computer for receiving data corresponding to said content from said analyzer and for receiving other data corresponding to the temperature in the kiln, the ash content present in the sample being determined from the absolute content of said inorganic constituent, and means responsive to a signal from said computer for controlling the addition of a sweetener fuel and the flow of coal to said burner so as to maintain the temperature in the kiln uniform.
Dependencies are inferred from the claim text.