Reasons why the outlet temperature of the heating furnace cannot be increased and solutions

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①The hydrogen content in the fuel gas is too high; efforts should be made to change its composition. ②The fuel gas pressure is low; increase the fuel gas pressure. ③If the fuel gas contains water or steam leaks in, enhance dehydration, inspect the heater, and carry out repairs. ④The nozzle orifice is blocked; check and clean it. ⑤The fuel gas flame arrester was clogged; switch to another set of flame arresters and clean the clogged one. ⑥If the fuel gas control valve is faulty or clogged, operate using the bypass line and inspect the control valve. ⑦If the flue damper is opened too wide, heat loss increases, the excess air coefficient rises, and the temperature at the flue gas outlet becomes too high; it is necessary to close the flue damper slightly to reduce the amount of air entering the furnace. ?⑧ Incomplete combustion results in black smoke coming from the chimney; adjust the amount of air supplied to the furnace and the opening degree of the flue dampers to ensure complete combustion. ⑨The large feed volume to the heating furnace causes overload; reduce the load on the heating furnace. ?⑩ When the flame in the heating furnace goes out, close the fuel gas valve, purge the furnace chamber, and restart ignition according to the ignition procedure.