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Title: Efficiency improvements to horizontal multi-tubular shell boilers
Author: Roberts, Ian Lenton
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2012
Availability of Full Text:
Full text unavailable from EThOS. Thesis embargoed until 01 Dec 2022
Multi-tubular horizontal shell boilers have existed in their current, packaged, form for many decades and their principle of operation is unchanged from the original Cornish boiler invented at the turn of the nineteenth century. More recent trends in the costs of hydrocarbon fuels, fears concerning global warming and levels of harmful emissions have led to renewed interest in the improvement of their thermal efficiency. Multi-tubular horizontal shell boilers present a number of challenges to the improvement of their thermal efficiency. The temperature of the saturated water inside the shell creates a thermodynamic barrier to increasing the efficiency whilst recovery of otherwise waste heat from the exhaust poses its own problems. This work addresses both of these issues: the heat transfer rate inside the convective passes of the boiler was increased as a result of this work leading to an increase in thermal efficiency of up to 1.9%. Further, a method of waste heat recovery using a bespoke recuperator to pre-heat the incoming combustion air was also developed by the author. This itself further increased the thermal efficiency by up to 5.0%. Both of these developments were incorporated into a test boiler and the efficiency gains were verified under experimental conditions. This work also contains some treatment of risk analysis as applied to multi-tubular horizontal shell boilers. It resulted from the issuance of a new guidance document by the Health and Safety Executive which re-stated and stipulated the legal requirement for risk assessment. During the course of the work on thermal efficiency it became apparent that there is a lack of understanding of risk analysis within the industry and -v- moreover a lack of reliable data relating to incidents and accidents. This work considers appropriate risk assessment methodologies for the industry and also the availability or otherwise of appropriate data by which the identified risks may be quantified.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available