Tube heating furnace deep energy-saving technology

The invention relates to a tube heating furnace deep energy-saving technology. The technology employs an energy-saving concept of fuel gas deep desulfurization, and functions of dual pre-heating combustors are improved through the addition of a fuel gas pre-heater and a gas desulfurization reactor, so that the dew-point temperature in the flue gas can be reduced, the exhaust gas temperature of the flue gas can be decreased, the thermal efficiency of a system can be improved, high-intensity combustion can be performed, the energy utilization rate is high, the fuel is saved, a process flow is simple, a good environmental protection function is achieved, and the reliability and security during an operation process are high. Compared with the prior art, the method can be widely applied, an operation period is long, the reliability and the security are high, the engineering investment is saved, and an improved method is provided for energy conservation for a tube heating furnace.