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A new module from Bosch Industriekessel Air preheating is increasing system efficiency Return on capital expected in two years
- November 21, 2013
- Press releases
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The air preheating system is available for single or double flame tube steam boilers with duoblock burners. It is recommended for use in applications in which process conditions mean that it would not make sense to include a flue gas condenser. On account of its special hydraulic circuitry, the system has far fewer components than commercially available two-circuit systems. It consists of a three-way valve, a combined flue gas heat exchanger and an air-side heat exchanger. If double flame tube boilers such as the one at Paloma are used, the system features two air-side heat exchangers.
A part of the hot feed water is directed to the air-side heat exchangers via the three-way valve. This preheats the combustion air for firing and reduces the temperature of the feed water. The downstream flue gas heat exchanger recovers heat from the hot boiler waste gases as a result of the cooled feed water partial flow reducing the flue gas temperature. The efficiency of the boiler system is up to two percent higher, whilst fuel consumption and emissions are lower.
The ZFR gas-fired boiler produces approximately 30 tons of steam per hour in the paper factory. An integrated superheater module on the boiler generates superheated steam instead of saturated steam, as a result of which temperatures of up to 285 degrees Celsius can be reached. The steam is required for production processes such as drying paper rolls. Every year, Paloma produces hygiene products including toilet paper, tissues, paper towels and napkins from approximately 70,000 tons of paper.
Thanks to the BCO boiler control, operation is user-friendly and settings can be tailor-made according to demand. Integrated fault messaging management, along with troubleshooting support via Bosch Teleservice, make for seamless operation.
Previously, Paloma was using a steam turbine and a 30-year-old water tube boiler. The absence of heat recovery devices meant that significant potential for savings was not being tapped into. With the new Bosch boiler system with economizer and air preheating system, the paper manufacturer now has an energy generation system at its disposal that is optimised in terms of both economic efficiency and the environment. With continuous operation, return on capital for the total investment should be seen in approximately two years. The Slovenian company C. P. Biro, a long-term partner of Bosch, was responsible for all aspects of project support locally.
Bosch Industriekessel GmbH, part of the Bosch Thermotechnik GmbH, has stood for innovation in industrial boiler technology for more than 145 years. Boiler systems for steam, hot water and heating, manufactured to customers' specification, provide efficient heating and process heat for all applications. Boiler house components, which are modular in design and perfectly coordinated, together with intelligent regulation and control technology, significantly simplify the planning, installation and commissioning of the complete system. Comprehensive service support from one source rounds off the innovative product portfolio.
PI8392 - November 21, 2013