초록 ▼

A system for monitoring combustion of coal in a boiler detects coal composition and heating value using a bulk material analyzer and determines an air/fuel mixture so that when the coal is burned oxygen is available throughout the boiler and the wall temperature of the boiler is maintained below the

A system for monitoring combustion of coal in a boiler detects coal composition and heating value using a bulk material analyzer and determines an air/fuel mixture so that when the coal is burned oxygen is available throughout the boiler and the wall temperature of the boiler is maintained below the metallurgical limit and the surface temperature below the ash fusion temperature of the coal where slagging is not desired. The temperature and pressure of steam in the boiler, fuel and air flow rates and temperature and oxygen content of the stack gases are supplied to a boiler model. The boiler model predicts how varying the air supply rate affects sensible heat loss. Periodic measurements of unburned carbon in the ash produced by combustion of the coal are correlated with the operation of the boiler at the time that the ash was produced to provide a basis for estimating unburned coal loss. An optimum air/fuel mixture is determined to minimize heat loss for a given steam production rate or to maximize steam production, using the estimate of unburned carbon loss and output from the boiler model, while at all times maintaining sufficient air flow to prevent oxygen depletion and acceptable wall temperatures.

대표청구항 ▼

A method of using a computer to monitor combustion of fuel to heat a fluid in a boiler, said method comprising the steps of: (a) detecting characteristics of the fuel supplied; (b) measuring physical properties of the apparatus, by performing the following substeps: (b2) measuring flow, temperature

A method of using a computer to monitor combustion of fuel to heat a fluid in a boiler, said method comprising the steps of: (a) detecting characteristics of the fuel supplied; (b) measuring physical properties of the apparatus, by performing the following substeps: (b2) measuring flow, temperature and pressure of the fluid in the boiler; and (b2) detecting stack gas temperature; and (c) determining an air/fuel mixture resulting in at least one of minimal heat loss and maximum production, while meeting operational criteria, said determining including the following substeps: (c1) measuring rates of air and fuel supplied; (c2) comparing the flow, temperature and pressure measured in step (b1) with a desired steam output; and (c3) determining the air/fuel mixture for optimized operation, including the factors of (c3i) minimizing heat loss in the stack gases; and (c3ii) preventing deterioration of the boiler while maintaining the desired steam output.