Tubular furnace, single tube, double tube, horizontal, open type, vertical, single temperature zone, double temperature zone, three temperature zone and other tubular furnace types. Tubular furnace (high temperature atmosphere furnace) is mainly used in colleges and universities, scientific research institutes, industrial and mining enterprises and other experiments and small batch production. It has the advantages of safe and reliable, simple operation, high temperature control accuracy, good heat preservation effect, large temperature range, high temperature uniformity of furnace, many temperature zones, optional atmosphere, vacuum furnace type, etc.
Single set point or 30-segment programmable controller is available. Alumina ceramic fiber material and double layer structure can reduce the external temperature to normal temperature. The average temperature is long, the operation is simple, the sealing is reliable, the comprehensive performance index is high. The furnace tube can be selected with heat-resistant steel, quartz glass, ceramic tube and other materials.
The first category:
Vacuum tube furnace, atmosphere tube furnace
The second category:
Ordinary tube furnace, rotary tube furnace, multi-station tube furnace
The third category:
Split tube furnace, integrated tube furnace, vertical tube furnace, horizontal tube furnace
The fourth category:
Single temperature zone tube furnace, double temperature zone tube furnace, three temperature zone (multi-temperature zone) tube furnace
Advantages and disadvantages of tubular furnace:
Advantages:
The process is mature; The furnace structure is simple; Easy to operate, easy to control, continuous production; The yield of ethylene and propylene was higher and the product concentration was higher. Less power consumption, high thermal efficiency; Most of the cracking gas and flue gas can be recovered. The application range of raw materials is expanding with the progress of cracking technology. Can be multi-furnace combination and large-scale production.
Cons:
(1) There are certain limits to the applicability of heavy raw materials
When cracking heavy raw materials, because heavy raw materials are easy to coking, it is necessary to shorten the operation cycle, reduce the cracking depth, often light coke, shorten the annual effective production time, but also affect the life of the cracking furnace and furnace tube. When the cracking depth is reduced, the utilization rate of raw materials is not high, the quantity of low-value products such as heavy raw oil is large, and the cost of public works is also increased.
(2) According to the process requirements of high temperature short residence time and low hydrocarbon partial pressure, the surface thermal strength of the furnace tube is bound to be increased, which requires oil high temperature resistant alloy pipe and cast pipe technology.
