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Boiler technology |


By clarifying special operating circumstances upfront, fan design could have been optimised for the unique conditions prior to installation. For example, when a large turn-down is required, an outlet damper can be added to the fan and a cross-connecting linkage can be used to drive both inlet and outlet damper control from a single actuator.


Rigours of the real world In summary, when specifying boiler fan packages for power generation, it is important to select equipment that can withstand the real-world rigours of the specific application and that take into consideration any special circumstances or operating conditions that may apply. By both specifying the appropriate fans and integrating remote monitoring and predictive maintenance capabilities, power plants can keep operations running smoothly, maximise efficiency, and reduce the costs of maintenance, excessive power consumption, and unexpected downtime.


Above: Shaft collar pressure and air temperature measurement


2/3 operating speed. At turn down, burner air pressure was very low – roughly 4% of design pressure – and the amplified pressure wave produced the burner instability.


Only then did the end user explain that turn- down was the normal operating condition for this particular boiler. The boiler was designed to support peak steam load when other boilers were off-line or couldn’t keep up with plant steam requirements. As such, the fan ran in this condition most of the time.


The solution was to install a bypass duct to allow fan air flow to be short-circuited from the fan outlet to the inlet. The duct was sized to allow the needed flow rate at fan peak pressure. This would produce a flow rate in the fan that was large enough to prevent blade stall, while allowing the boiler to experience normal air flow. A bypass duct damper-controlled flow in the bypass. It was procured with an opposite sense control signal, configured to close as the fan control damper opened.


Above: Fan wheel failure


Hydrogen combustion – proven technology ready for the future


Building on its long track record of providing steam generation technology, Wood has recently completed a project for Petronas in Malaysia that has seen the supply of a boiler burning high H2


content fuel. What are some of the main challenges and factors to be considered in implementing a multifuel boiler project of this kind? Samuel Valderas Wood


Although the project described here was implemented at a petrochemical facility, the new boiler is compatible with the electricity sector, where the use of hydrogen can be a means of long-term and large-scale energy storage, as well as helping to improve the flexibility of the energy supply system.


The “package boiler” concept employed in this project also fits well with decentralised electricity provision in isolated and non-grid- connected regions.


The project started in 2018 and was part of the Petronas plan to rejuvenate the steam generating island of its methyl tert-butyl ether plant in the city of Kuantan where there are three Wood boilers that had been operating for almost 30 years. The overall project scope for Wood included the total replacement of one boiler with a new one including auxiliaries. Wood Malaysia is provider of engineering services for the balance of plant and tie-ins to connect the new boiler to the existing boilers and plant steam system.


48 | October 2021 | www.modernpowersystems.com


The project execution plan envisaged providing the same boiler as the original, with its proven reliability.


But a key goal was upgrade of the previous proven design to current best-in-class practices.


For this reason, reverse engineering was needed to adapt the boiler concept that Wood and Petronas considered 30 years ago to modern codes and to incorporate all available improvements.


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