Multilevel sampling system for gas analyser in circulating fluidized bed gasification
Insinööritieteiden korkeakoulu | Master's thesis
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Energia- ja LVI-tekniikan koulutusohjelma
AbstractThe main topic of this Master’s Thesis is the development of a multilevel sampling system for gas analysers, in which a single gas analyser can measure the gas composition from gasification or combustion, in three different levels in a riser of a circulating fluidized bed reactor. The two analysers used in this work were the Dx-4000 GASMET gas analyser and the Siemens ULTRAMAT 23 gas analysers. The multilevel sampling system consist of three levels, which are connected to the reactor by steel pipes. There is a computer controlled solenoid valves that controls which level is sampled. In addition, there is an oil scrubber in each level to protect the system from unwanted and dangerous substances such as tar. Heat transfer equations have been used in the process of designing the multilevel system in order to not surpass the maximum allowable temperature of some components. The residence time has also been considered in designing the system, as it is an important parameter, since it had to be as short as possible to avoid some changes in the composition of the gas sampled as well as increasing the acquired amount of reliable measurement data from each test. Finally, the transitional and steady time (residence time) for reliable measurements were calculated for both analysers, obtaining 60 seconds of reliable measurements for GASMET analyser and 40 seconds for ULTRAMAT analyser. One combustion test was done in order to check that the system worked correctly, whose the results were satisfactory.
Thesis advisorSaeed, Loay
multilevel, gasification, combustion, analyser, residence time, tar