Method for controlled operation of a heated, in particular regeneratively heated, industrial furnace, open-loop and closed-loop control unit, and heatable industrial furnace

A method for controlled operation of a regeneratively heated industrial furnace, with a furnace chamber with a melting end comprising:

• conducting fuel into the furnace chamber by way of at least one fuel injector configured for the injection of fuel virtually without combustion air,
• conducting a gaseous oxygen carrier into the furnace chamber, wherein
• automatically controlling, using a control loop, a supply of the fuel and a supply of the gaseous oxygen carrier, and
• setting, by a final controlling element, at least one of:
• a first adjustable manipulated variable in a form of a flow of the fuel into the furnace chamber and a second adjustable manipulated variable in a form of a flow of the gaseous oxygen carrier into the furnace chamber,
• determining, by the control loop, an energy requirement as an energy SETPOINT value,
• feeding, by the control loop, the energy requirement to a quantitative control for the gaseous oxygen carrier and to a quantitative fuel control for the fuel, and
• determining, by the control loop, the flow of the gaseous oxygen carrier as a process value of the flow of the gaseous oxygen carrier, wherein the flow of the gaseous oxygen carrier is determined with allowance for a product of:
• a specified air/oxygen excess,
• the energy requirement as the energy SETPOINT value, and
• a specified stoichiometric combustion air/oxygen requirement, as a quantity of air/oxygen per unit of energy, wherein the quantity of air/oxygen per unit of energy is constantly specified as an energy related air/oxygen constant, and
• determining the flow of fuel as a process value of a volumetric flow of fuel, wherein the flow of fuel is determined with allowance for a quotient of:
• directly the energy requirement as the energy SETPOINT value, and
• a calorific value of the fuel.