Method for controlling additive feed in a boiler system
First Claim
1. A method of controlling the feed of an additive to a fuel-burning boiler system which comprises:
- (a) detecting a plurality of boiler operational parameter values and converting said values to corresponding boiler parameter signals;
(b) converting each of said boiler parameter signals to a control signal in accordance with its own characteristic conversion program;
(c) combining each of said control signals in accordance with a predetermined schedule;
(d) detecting the existing additive feed and producing a corresponding computed additive feed signal, and(e) comparing said existing additive feed signal and said computed additive feed signal and modifying the additive feed to cause it to conform to said computed additive feed signal if necessary.
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Abstract
The method of operation of a boiler system to which an additive is to be fed at a controlled rate and in which the optimal additive rate depends upon a plurality of changing parameters of the boiler system, in which the relationship between each of those parameters and the optimal additive feed rate is determined, the relevant parameters are sensed during the operation of the system, their effects on optimum additive feed are computed in accordance with said relationships and combined on a continuous basis to produce a control signal representative of the desired rate of additive feed, and controlling the additive feed in accordance therewith, all preferably continuously.
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Citations
23 Claims
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1. A method of controlling the feed of an additive to a fuel-burning boiler system which comprises:
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(a) detecting a plurality of boiler operational parameter values and converting said values to corresponding boiler parameter signals; (b) converting each of said boiler parameter signals to a control signal in accordance with its own characteristic conversion program; (c) combining each of said control signals in accordance with a predetermined schedule; (d) detecting the existing additive feed and producing a corresponding computed additive feed signal, and (e) comparing said existing additive feed signal and said computed additive feed signal and modifying the additive feed to cause it to conform to said computed additive feed signal if necessary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling the feed of an additive to a fuel-burning boiler system which comprises:
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(a) detecting a plurality of boiler operational parameter values, said parameters being members of the group consisting of load, fuel feed, amount and temperature of combustion air, sulfur trioxide content, exit gas temperature and effluent opacity, and converting said values to corresponding boiler parameter signals; (b) converting each of said boiler parameter signals to a control signal in accordance with its own characteristic conversion program; (c) combining each of said control signals in accordance with a predetermined schedule; (d) detecting the existing additive feed and producing a corresponding computed additive feed signal, and (e) comparing said existing additive feed signal and said computed additive feed signal and modifying the additive feed to cause it to conform to said computed additive feed signal if necessary. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification