Fuel gas calorie control method and device

A fuel gas calorie control method which is applied to a fuel gas production system for mixing a first heat increasing gas with a blast furnace gas discharged from a blast furnace of an iron mill to form a first mixed gas, further mixing a second heat increasing gas with the first mixed gas to form a second mixed gas, and supplying the second mixed gas, as a fuel gas, to blast furnace gas fired gas turbine equipment, and which exercises control such that calories of the second mixed gas become set calories required by the blast furnace gas fired gas turbine equipment,

• the fuel gas calorie control method comprising:
• predicting calories of the first mixed gas by calculations based on a mixed flow rate of the blast furnace gas measured by blast furnace gas flow rate measuring means, a mixed flow rate of the first heat increasing gas measured by first heat increasing gas flow rate measuring means, calories of the blast furnace gas measured by blast furnace gas calorie measuring means, and calories of the first heat increasing gas measured by first heat increasing gas calorie measuring means;
• calculating a flow rate ratio of a mixed flow rate of the second mixed gas to a gas turbine consumed fuel gas flow rate based on the predicted calories, the set calories, and calories of the second heat increasing gas measured by second heat increasing gas calorie measuring means;
• calculating a mixed flow rate required value of the second heat increasing gas based on the flow rate ratio and a gas turbine fuel gas requirement signal corresponding to the gas turbine consumed fuel gas flow rate;
• and
• controlling an opening of a flow control valve for the second heat increasing gas provided in the fuel gas production system, based on the mixed flow rate required value of the second heat increasing gas, to control a mixed flow rate of the second heat increasing gas.

A fuel gas calorie control device which is applied to a fuel gas production system for mixing a first heat increasing gas with a blast furnace gas discharged from a blast furnace of an iron mill to form a first mixed gas, further mixing a second heat increasing gas with the first mixed gas to form a second mixed gas, and supplying the second mixed gas, as a fuel gas, to blast furnace gas fired gas turbine equipment, and which exercises control such that calories of the second mixed gas become set calories required by the blast furnace gas fired gas turbine equipment,

• the fuel gas calorie control device comprising:
• blast furnace gas flow rate measuring means for measuring a mixed flow rate of the blast furnace gas;
• first heat increasing gas flow rate measuring means for measuring a mixed flow rate of the first heat increasing gas;
• and
• calorie control means which predicts calories of the first mixed gas by calculations based on the mixed flow rate of the blast furnace gas measured by the blast furnace gas flow rate measuring means, the mixed flow rate of the first heat increasing gas measured by the first heat increasing gas flow rate measuring means, preset blast furnace gas calories, and preset first heat increasing gas calories, calculates a flow rate ratio of a mixed flow rate of the second mixed gas to a gas turbine consumed fuel gas flow rate based on the predicted calories, the set calories, and preset second heat increasing gas calories, calculates a mixed flow rate required value of the second heat increasing gas based on the flow rate ratio and a gas turbine fuel gas requirement signal corresponding to the gas turbine consumed fuel gas flow rate, and controls an opening of a flow control valve for the second heat increasing gas provided in the fuel gas production system, based on the mixed flow rate required value of the second heat increasing gas, to control a mixed flow rate of the second heat increasing gas.

A fuel gas calorie control device which is applied to a fuel gas production system for mixing a first heat increasing gas with a blast furnace gas discharged from a blast furnace of an iron mill to form a first mixed gas, further mixing a second heat increasing gas with the first mixed gas to form a second mixed gas, and supplying the second mixed gas, as a fuel gas, to blast furnace gas fired gas turbine equipment, and which exercises control such that calories of the second mixed gas become set calories required by the blast furnace gas fired gas turbine equipment,

• the fuel gas calorie control device comprising:
• blast furnace gas flow rate measuring means for measuring a mixed flow rate of the blast furnace gas;
• first heat increasing gas flow rate measuring means for measuring a mixed flow rate of the first heat increasing gas;
• blast furnace gas calorie measuring means for measuring calories of the blast furnace gas;
• first heat increasing gas calorie measuring means for measuring calories of the first heat increasing gas;
• second heat increasing gas calorie measuring means for measuring calories of the second heat increasing gas;
• and
• calorie control means which predicts calories of the first mixed gas by calculations based on the mixed flow rate of the blast furnace gas measured by the blast furnace gas flow rate measuring means, the mixed flow rate of the first heat increasing gas measured by the first heat increasing gas flow rate measuring means, the calories of the blast furnace gas measured by the blast furnace gas calorie measuring means, and the calories of the first heat increasing gas measured by the first heat increasing gas calorie measuring means, calculates a flow rate ratio of a mixed flow rate of the second mixed gas to a gas turbine consumed fuel gas flow rate based on the predicted calories, the set calories, and the calories of the second heat increasing gas measured by the second heat increasing gas calorie measuring means, calculates a mixed flow rate required value of the second heat increasing gas based on the flow rate ratio and a gas turbine fuel gas requirement signal corresponding to the gas turbine consumed fuel gas flow rate, and controls an opening of a flow control valve for the second heat increasing gas provided in the fuel gas production system, based on the mixed flow rate required value of the second heat increasing gas, to control a mixed flow rate of the second heat increasing gas.