Cross-limit control of the outlet temperature of the heating furnace

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The cross-limit control program takes into account the principle of increasing the hot air flow rate before increasing the gas flow rate when raising the temperature, and decreasing the gas flow rate before reducing the hot air flow rate when lowering the temperature. However, it is possible for the program to increase the gas flow rate first during temperature elevation; thanks to the low-limit setting at TY1024A, the gas flow rate does not rise too high, which prevents the oxygen level in the heating furnace from becoming too low； It may also occur during cooling, when the fuel gas flow is reduced first; due to the high selection at TY1024B, the fuel gas flow does not drop too low, which prevents the oxygen level in the heating furnace from becoming too low. This ensures an adequate oxygen level in the heating furnace at all times.