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Title: An experimental investigation of spray combustion in a two stage system
Author: Archer, John Stuart
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1969
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This work is concerned with the spray combustion of residual fuel oil in a two stage combustion pilot plant. One of the primary objects in the study is the elimination of the high temperature corrosion normally associated with the combustion of such a fuel oil, and the collection of data for subsequent design of an optimum system. The temperature, composition and heat transfer properties of the combustion products from a steam atomised residual fuel spray is reported, and the results related to theoretical predictions. In the first stage combustion chamber, or gasifier, the fuel is introduced as a spray using superheated steam in a twin fluid atomiser. Combustion air is admitted to .cause a partial oxidation at equivalence ratios between 1,14 and 2.32. A tubular heat exchange section is located between the gasifier and the second stage combustion chamber, and heat transfer measured. In the second stage the combustion reaction is completed by further addition of air at a range of equivalence ratios from 0.71 to 1.25. Electron microscopy and X-ray techniques are used to study solid combustion products collected by deposition probe or venturi scrubber/cyclone methods. On-line gas chromatography is used to measure gas compositions and a water cooled suction pyrometer is used to measure combustion temperatures. The inlet temperature of the second stage chamber is calculated at blowout conditions using a water spray probe. Substances causing high temperature corrosion are not detected under fuel rich conditions in the second stage but are found at equivalence ratios less than 1.0. The factors affecting minimum solid loading in the second stage are determined, by and related to operating conditions. At equivalence ratios of Ø1 = 1.9 and Ø2 = 1.0, and fuel and steam flow rates of 3 g/s it is possible to produce a hot gas stream free from high temperature corrosion and with a solid loading of 0.2% of the fuel input.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available