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Waste Heat Recovery System for an Activated Carbon Regeneration Furnace

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Most chemical or process plants are heated by either steam or thermal fluid from a central energy centre. If the cost per unit of energy can be reduced then this will give an across the board saving regardless of product, process or throughput. An economiser for either steam, hot water or thermal fluid can usually reduce the unit cost of energy by around 5%. Therm Tech will be showcasing their range and applications of boiler economisers which can often achieve a 12 month return on
investment.

If the waste heat from a process can be harnessed and re-used as a different source of energy input back into the process then the economic benefits can be tremendous. If this is not possible, from either a process or economic viewpoint,then the waste heat may be effectively used in a different process. Therm Tech will be showcasing various heat recovery systems that they have installed in a wide variety of Chemical and Industrial plants.

As process engineers with a wide spectrum of different industries Therm Tech have often identified ways of producing the same product using a less energy intensive method.

Case study heat recovery: ACTIVATED CARBON REGENERATION FURNACE WASTE HEAT RECOVERY SYSTEM

A UK-based edible oils processing plant use activated carbon in order to clean up various contaminants contained within the oils for product quality reasons. The spent carbon is regenerated on-site in a gas fired rotary hearth furnace and the hot
exhaust gases (700°C) from the furnace are a valuable high grade source of waste heat.

Due to the contaminants contained within the furnace exhaust gases, they were being cooled down to below 220°C with quench water before entering a Venturi scrubber and then sent to atmosphere.

Therm Tech Ltd have successfully harnessed this waste heat into a system which generates approximately 1,500 kg per hour of steam at 13 bar g pressure, fed directly into the site’s high pressure steam main, saving ~£250,000 per year in natural gas at the boiler house, a reduction of CO2 emissions of ~1,700 tonnes / per year and a reduction of quench water evaporation of ~30 L/min.

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