Structure and Refractory Materials of Ethylene Revamp Furnaces

An ethylene cracking furnace is a device used to produce ethylene. Ethylene is an important chemical raw material, which is usually produced by thermal cracking process. The decomposition of heavy-duty hydrocarbon feedstock, usually petroleum feedstock or natural gas, into ethylene and other by-products. The following is the structure of the ethylene cracking furnace and an introduction to the refractories used in each part of the furnace.

Structure of Ethylene Revamp Furnace

1. Heating furnace. The core part of the ethylene cracking furnace is the heating furnace. It is used to provide high temperature and heat energy to promote the decomposition of hydrocarbons.
2. The reactor. The part behind the heating furnace includes the reaction catalyst, such as graphite, metal catalyst, etc. It is used to catalyze the decomposition of hydrocarbons.
3. Separation device. Used to separate the resulting ethylene and other byproducts from the reaction mixture. This usually includes equipment such as condensers and fractionators.

Refractory Materials of Ethylene Revamp Furnaces

Classification of Ethylene Cracking Furnaces

According to different design and operating conditions, ethylene cracking furnaces can be divided into different types. Includes:

• Hot cracking furnace. The decomposition of hydrocarbons is mainly dependent on high temperatures, usually using pyrolysis tubes or in circular furnaces.
• Catalytic cracking furnace. Catalysts are used at high temperatures to promote the decomposition of hydrocarbons, usually in fluidized beds or other reactor types.
• Kiln type furnace. The structure of these furnaces is cylindrical and can accommodate large quantities of raw materials, suitable for the production of large quantities of ethylene.
• Narrow slit furnace. The reaction space with a slit shape helps to improve the reaction efficiency and yield.
• Stacking bed stove. A solid particle bed is used to support the catalyst, suitable for pyrolysis reactions at high temperatures.

Characteristics of Ethylene Revamp Furnace

1. High-temperature operation. Ethylene cracking furnaces typically require high temperatures, usually between 700 ° C and 1000 ° C, to facilitate the decomposition of hydrocarbons.
2. Catalytic reaction. Some ethylene-cracking furnaces use catalysts to improve the reaction rate and selectivity.
3. To produce ethylene. The main purpose is to produce high-purity ethylene, but some by-products, such as propylene, methane, etc., are also produced.
4. Energy consumption problem. Due to high-temperature operation, ethylene-cracking furnaces require a large energy supply. Therefore, energy consumption is an important consideration.
5. Continuous operation. Most ethylene cracking furnaces are in continuous operation to ensure continuous output.

The design and operation of an ethylene cracker depends on factors such as the scale of production, the type of feedstock, and the quality of ethylene required. Different ethylene cracking processes may have different structures and characteristics.

Refractory for Ethylene Revamp Furnaces

Ethylene cracking furnaces need to use refractory materials to resist high temperatures and corrosion to ensure long-term stable operation of the equipment. DENSE REFRACTORY FOR ETHYLENE REVAMP FURNACES. The following are some refractories commonly used in ethylene cracking furnaces.

• Silicate refractory. Silicate refractories are often the more common choice because they exhibit good stability at high temperatures and are chemically inert. Silicate materials include graphite, alumina, silicon oxide, and quartz.
• High aluminum refractory. High aluminum refractories are rich in alumina and are usually used in refractory bricks, refractory castables, and other parts to resist high-temperature corrosion.
• Silicon carbide refractory. Sic refractories exhibit excellent stability at very high temperatures and can therefore be used in certain high-temperature areas, such as inside the furnace.
• Boron nitride refractory. Boron nitride materials show good performance at very temperatures, but they are relatively expensive and are usually used in some special high-temperature areas.
• Molybdenum, tungsten and other superalloys. In some cases, special superalloys such as molybdenum, tungsten, etc., can also be used to resist high temperatures and corrosion.

These refractories are often used in different parts of ethylene cracking furnaces, selected according to their specific application and desired properties. For example, furnace walls may require materials that are more resistant to high temperatures, while catalyst beds in reactors may require, for example, higher refractory bricks. DENSE REFRACTORY FOR ETHYLENE REVAMP FURNACES. Different types of refractories can be combined to meet the needs of different parts and ensure the stable operation of the ethylene cracking furnace.