COKE OVEN GAS
Coke oven gas (COG), a by-product of coal carbonization in coke ovens, is a valuable yet challenging fuel that must be cooled, cleaned, and reused efficiently. Managing its high temperature, chemical complexity, and condensable tar and ammonia vapors requires robust, high-performance heat exchangers.
Coke oven gas (COG), a by-product of coal carbonization in coke ovens, is a valuable yet challenging fuel that must be cooled, cleaned, and reused efficiently. Managing its high temperature, chemical complexity, and condensable tar and ammonia vapors requires robust, high-performance heat exchangers.
The main challenges in this sector
The main challenges in this sector
High-temperature and high-volume flow
COG exits ovens at over 800°C, demanding exchangers that can handle sustained thermal stress and rapid heat transfer without performance degradation.
Tar and particulate fouling
Condensation of heavy hydrocarbons like tar can clog conventional heat exchangers, reducing efficiency and requiring frequent maintenance or cleaning.
Corrosive compounds in raw gas
Ammonia, hydrogen sulfide, and sulfur compounds within raw COG cause corrosion in standard materials, shortening exchanger life if not properly managed.
Energy recovery needs
Steelmakers seek to recover heat from COG for use in boilers or power generation, requiring reliable thermal exchange even with fluctuating loads.
Our involvement in the sector
Nexson delivers tailored heat exchanger solutions for COG cooling and recovery, combining robust welded construction, anti-fouling design, and materials engineered for corrosion resistance.
Securing energy recovery from the toughest process gas
Thermal durability under severe operating conditions
Our heat exchangers are designed to withstand inlet gas temperatures of up to 450°C. They are able to withstand these thermal loads thanks to an all-welded construction that resists expansion and thermal cycling. Spiral heat exchangers are particularly well suited to these conditions, offering both mechanical strength and a compact design that simplifies integration.
Minimized fouling with spiral flow paths
Nexson’s spiral heat exchangers promote continuous, turbulent flow that minimizes tar and particulate build-up. This reduces cleaning intervals and maintains efficiency even in tar-laden streams.
Material resistance to aggressive media
COG typically contains aggressive elements like ammonia and sulfur compounds. Nexson exchangers are available in corrosion-resistant materials such as duplex stainless steels and high-nickel alloys. Spiral models, in particular, have proven highly effective in handling chemically aggressive environments, offering both reliability and long service life.
Supporting energy recovery and heat reuse
Nexson heat exchangers enable efficient heat recovery from hot COG, contributing to steam production, combustion air preheating, or electricity generation. This recovered energy improves overall plant performance and supports sustainability goals.
Securing energy recovery from the toughest process gas
Thermal durability under severe operating conditions
Our heat exchangers are designed to withstand inlet gas temperatures of up to 450°C. They are able to withstand these thermal loads thanks to an all-welded construction that resists expansion and thermal cycling. Spiral heat exchangers are particularly well suited to these conditions, offering both mechanical strength and a compact design that simplifies integration.
Minimized fouling with spiral flow paths
Nexson’s spiral heat exchangers promote continuous, turbulent flow that minimizes tar and particulate build-up. This reduces cleaning intervals and maintains efficiency even in tar-laden streams.
Material resistance to aggressive media
COG typically contains aggressive elements like ammonia and sulfur compounds. Nexson exchangers are available in corrosion-resistant materials such as duplex stainless steels and high-nickel alloys. Spiral models, in particular, have proven highly effective in handling chemically aggressive environments, offering both reliability and long service life.
Supporting energy recovery and heat reuse
Nexson heat exchangers enable efficient heat recovery from hot COG, contributing to steam production, combustion air preheating, or electricity generation. This recovered energy improves overall plant performance and supports sustainability goals.
