Method for optimizing the position of a furnace damper without flue gas analyzers
AssigneeShell Oil Company
InventorsRobert E. Sheffield, Robert L. Chew, Charles R. Cutler
Life of this patent
Estimating the term…
Abstract
A process for optimizing the combustion of fuel in a furnace wherein the total weight of carbon and hydrogen in the fuel is determined and from the total weight of hydrogen and carbon the air required for combustion can be computed with the air flow to the furnace being adjusted to provide the combustion air plus the desired excess oxygen. The efficiency of the furnace versus excess oxygen is determined and the excess oxygen is varied a small amount on each side of the optimum point obtained from the efficiency versus excess oxygen determination to continuously verify the optimum point.
Claims12
A process for optimizing the combustion of fuel in a furnace comprising:
- measuring the fuel flow to the furnace per unit of time;
- measuring the density of the fuel;
- using the measured fuel flow and density to convert the fuel flow to the total weight of carbon and hydrogen supplied to the furnace per unit of time;
- calculating the air flow required per unit of time for combusting the total weight of carbon and hydrogen plus the additional air flow required for excess oxygen;
- and
- adjusting the air flow to the furnace in response to the calculated air flow.
A process for optimizing the combustion of fuel in a furnace wherein at least two different fuels are burned simultaneously in the furnace, said process comprising:
- measuring the flow of each fuel;
- measuring the density of each fuel;
- using the measured flow and density of each fuel to compute the total weight of hydrogen and carbon contained in each fuel;
- combining the weight of hydrogen and carbon for each fuel to obtain the total weight of hydrogen and carbon supplied to the furnace;
- determining the amount of air required to burn the total weight of hydrogen and carbon supplied to the furnace plus the desired excess oxygen;
- and
- controlling the air flow to the furnace to supply the required air plus recess oxygen.
Dependencies are inferred from the claim text.