Blog

Boiler fouling cases and the online cleaning systems

Mirek Spicar |

Each combustion of organic substances produces particles, which are discharged with the flue gas. These particles, called fly ash, fly through the boiler with the flue gas and settle down on the inner boiler walls and the heat exchanger tubes of the boiler. This results in a reduction of the heat transfer. These contaminants are removed by means of various cleaning systems. The most important automatic online cleaning methods are described below.

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Titelbild Kessel

Cleaning systems for convective sections of a waste incineration boiler

Mirek Spicar |

High fly ash load in the flue gas of waste and biomass incineration boilers causes deposits on the tube bundle heat exhange surfaces. To meet the boiler efficiency and to maintain the required temperatures of the downstream located plant components, the tube bundles must be cleaned periodically. In order to achieve the most constant possible conditions and for safety reasons, the cleaning should be carried out online during the boiler operation and without any personal intervention in the boiler. The cleaning procedures practiced in the plants are described below.

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Shock Pulse Generators exceed expectations on finned tube ECO cleaning in a biomass boiler

Mirek Spicar |

240.000 Tons of natural wood are being processed each year in the biomass boiler located in Nesle (France), where they are being converted into renewable electricity (130 GWh/year), process heat (220 GWh/year) and cooling water (2 GWh/year). The owner AKUO Energy and the operating company CNIM EB hence contribute since 2013 to a reduction of the CO2-emissions of the local industry.

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Shock Pulse Generators (SPGs) in a successful operation for coke industry cleaning bare as well as finned tubes of a high-temperature steam generator

Mirek Spicar |

Cokenergy LLC (USA) replaces all the originally installed sootblowers with SPGs for cleaning the Heat Recovery Steam Generators (HRSGs) for the entire sixteen HRSG fleet until the end of 2019. This was decided by the management after completing an evaluation of a 6-month trial run, where the bare as well as the finned tubes were cleaned to satisfaction.

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Excellent operating experience with the Shock Pulse Generators (SPG) in Perlen

Mirek Spicar |

Based on the good experience with the Shock Pulse Generators for boiler cleaning in the presently decommissioned waste incineration plant Real in Lucerne/CH, the operator of the new built plant Renergia in Perlen has again installed the SPGs of Explosion Power GmbH for cleaning of the first three boiler passes. Such operate to the full satisfaction of the customer since 2015.

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Protective Lining of a Waste Incineration Boiler

Mirek Spicar |

The combustion chamber of a waste incineration boiler is exposed to corrosive atmosphere where the temperatures can reach up to 1'400°C. It is obvious that the boiler walls must be protected accordingly.

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Shock Pulse Generators (SPG) prove excellent support tool for cleaning of large Supercritical power plant boiler

Mirek Spicar |

Explosion Power GmbH installed 4 TwinL SPGs into a Supercritical Pulverized Coal Boiler 660 MWel capacity which operate successfully in support of boiler cleaning and keeping the required flue gas outlet temperature within design specifications (inlet to SCR catalyst elements). For the next phase the Thai power producer intents to install additional 4 TwinL SPGs for saving feed water and steam and for cycle optimization.

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Minimizing corrosion in steam boilers in three steps: The corrosion diagram

Mirek Spicar |

There is no way around the problem of corrosion in power plants. Especially the desire for high steam temperatures and the use of different fuels pose new challenges for boiler manufacturers. What is required are boilers that are both economical and durable.

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Top five cleaning technologies to control buildups in radiation passes

Kaspar Ninck |

Maximale thermische Effizienz bei minimaler Korrosion – dies lässt sich nur erreichen, wenn die Rauchgase mit der optimalen Temperatur beim Endüberhitzer ankommen. Mit anderen Worten: Die Abkühlung der Rauchgase in den Strahlungszügen muss konstant und kontrolliert ablaufen (siehe Abbildung 1). Dies gelingt nur, wenn die Ablagerungen an den Wänden im laufenden Kesselbetrieb kontrolliert werden. Zur Reinigung von Strahlungszügen in Abfalllverbrennungsanlagen haben sich 5 Technologien etabliert: Sprühreinigung oder Nassabreinigung, Wasserlanzenbläser, Wandbläser, Klopfwerke und der Shock Puls Generator. Wir erklären Ihnen in Kürze, was hinter diesen Bezeichnungen steckt.

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How an intelligent retrofit permanently reduces slag build up in a biomass power plant’s furnace

Dr. Christian Steiner |

The Silbitz biomass power plant in Thuringia, Germany, produces electricity (5.6 MW) and district heat (3 MW) from waste wood. In order to keep its production competitive, a high degree of availability at the plant is required. This was not satisfactory in Silbitz. The reason was the furnace: Heavy slagging on the walls resulted in short boiler operation periods and frequent downtimes. Since 2011, four shock pulse generators have been cleaning the plant during ongoing operation. This has enabled the amount of slagging to be minimized and boiler operation periods to be lengthened in the long term.

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Improved boiler efficiency in just a few steps for large industrial boilers

Christian Mosbeck |

Energy demands are increasing while resources are becoming ever more scarce. Alternative fuels are gaining ground but their residue levels are high. Utilizing fuels and energy sources more efficiently is thus become increasingly important. Increasing boiler efficiency [1] not only helps towards protecting the climate, it also helps to lower a plant’s operating costs.

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Four causes of superheater corrosion that any Waste to Energy plant operator will know only too well

Kaspar Ninck |

Everyone knows them, everyone fears them: overheating corrosion in waste incineration plants. 4 causes all operators know - at the latest after reading this article.

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