EDC cracking furnaces are used in the production of vinyl chloride monomers (VCM) when ethylene dichloride (1,2- dichloroethane) is thermally cracked at high temperatures to produce vinyl chloride and anhydrous hydrogen chloride.
We have more than 50 years’ experience in the design of EDC cracking furnaces, with many of the older units (1970s or older) we designed still in operation.
We offer two types of heater design:
- The traditional, yet distinctive Terrace Wall™ design
- The radiant wall multi-burner side-fired design.
Both designs offer the advantages of double firing to ensure an optimal distribution of circumferential heat flux, resulting in lower peak film temperatures, reducing coke formation. Radiant coils are typically arranged horizontally with single or double staggered passes. The convection section can be mounted either directly on top of the radiant section or offset to one side.
Terrace Wall™ design
Our proprietary Terrace Wall™ design offers many advantages for petrochemical cracking where process tubes require uniform and controlled heat distribution in the radiant section, with higher heat input in the superheating section and a lower heat input into the hotter part of the cracking section.
While the Terrace Wall™ design uses multiple levels of burners to provide different heat input in the superheating/cracking section in the same fashion as the radiant wall multi-burner side fired design, it has the distinct advantage of significantly fewer number of firing levels and burners.
Radiant wall multi-burner side-fired design
The radiant wall multi-burner side fired design is commonly used for today's EDC cracking furnaces.
The multiple-level burners on each opposite firing wall provide varying heat input in the superheating/cracking section, optimising the heater load, the required conversion and run length between decoking operations.
Our experience in EDC furnaces is significant. Our track record includes:
- While a run length of 12 months between decoking is considered satisfactory, we have supplied a furnace that consistently operates for 18 months continuously between decoking
- A single furnace of up to 300,000 tons per annum VCM production
- Design of the radiant tube support is critical to ensure the radiant coil is adequately supported while still being allowed to move freely. We have developed a support system specifically for this application.