Energy saving and efficiency improvement of steel rolling heating furnace

The heating furnace is a device with large thermal hysteresis and thermal inertia. It is not suitable for frequent adjustment and shutdown, whether for extending the life of the equipment, controlling product quality or reducing energy consumption. Only continuous production can reduce production costs.

1. Increasing the hot charging rate and hot charging temperature is the key to increasing production.
2. The temperature control of each section in the furnace should be controlled according to different materials, and the residence time of each heating section after the billet enters the furnace should be strictly controlled. If the rolling is difficult to roll, the time of the billet in the furnace will be relatively long, and low temperature and low flow control should be adopted accordingly, and the fuel should be mainly distributed to the soaking section and the heating section. For products that are easy to roll, the fuel in the preheating section must be sufficient.
3. In recent years, with the application of new hot rolling technologies and the advancement of hot rolling equipment, the heating furnace is the key equipment in the steel rolling process, and the long shutdown time of kiln refractory maintenance has become a bottleneck restricting the energy saving and efficiency improvement of steel rolling enterprises. Therefore, the reasonable selection of refractory materials, the introduction of new zero-baking castables, and the reduction of shutdown time have successfully solved the pain points of enterprises and become the key to increasing benefits.

After the construction of ordinary low-cement castables is completed, necessary maintenance and baking work are required, resulting in a long maintenance time. After the construction of zero-baking castables is completed, the burner is started immediately without baking the furnace, and the temperature is ignited to the working temperature. Save the cost and time of baking the furnace.

For a steel rolling line with an annual output of 2.6 million tons, the overhaul plan is scheduled for about 40 days, and the planned baking time is 20 days. If zero-baking castables are used for heating furnace pouring construction, the rolling temperature can be reached 3 days after the pouring is completed, which can save 17 days of overhaul time. An additional 100,000 tons of rolled steel products can be produced that year, which can generate an additional benefit of about 80 million.

Energy saving and efficiency improvement of heating furnaces is a systematic project, with a lot of work to do and great technical difficulty. Only through continuous technological progress and the joint efforts of thermal workers, I believe that the energy saving and efficiency improvement of heating furnaces will reach a new level.