Online corrosion measurements in small- and mid-scale during pulverised biomass/coal co-combustion

Stephan, A.; Wolf, Christian; Fendt, S.; Spliethoff, Hartmut

doi:10.1016/j.egypro.2017.07.224

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The derived corrosion signals could be correlated to results of separate deposit measurements indicating a share of up to 30 wt % chlorine in deposits on the lee and side position of the material rings. In Stephan et al, the behavior of a similar sensor as used in Retschitzegger et al is investigated in a co-combustion environment of straw with different bituminous coals in a small-scale PF test rig. Less corrosion was detected during the co-combustion of coals with a higher share of Al in the ash, possibly showing better alkali capture ability.…”

Section: Introductionmentioning

confidence: 99%

Online Corrosion Measurements in Combination with Deposit and Aerosol Analysis during the Co-firing of Straw with Coal in Electrically Heated, Small-Scale Pulverized Fuel and Circulating Fluidized Bed Systems

et al. 2018

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A measurement campaign has been conducted both in a pilot-scale pulverized fuel and in a pilot-scale circulating fluidized bed test rig to evaluate the behavior of two different online corrosion sensors during the co-combustion of straw with bituminous coal. The online corrosion sensors based on the linear polarization method were equipped with material rings of the alloy10CrMo9-10 and air-cooled to a material temperature of 530 °C (PF) and 560 °C (CFB). They were implemented at a flue gas temperature of approximately 750–800 °C in both test rigs to simulate superheater tubes. The derived signals were compared with flue gas measurements (O2, CO2, SO2, and HCl) as well as selected fine particle measurements and deposit sampling during co-firing tests of 0, 10, 25, 40, 60, and 100% straw with coal on an energy basis. Slight deviations between the fuels tested in the different test rigs were observed. Main differences were measured in the coal ash composition and chlorine content of the straw. Online corrosion sensors reacted quickly to changes in the blend composition. While no enhanced corrosion was detected during the co-combustion of 10% and 25% straw, both sensors identified possible corrosive processes on the metal surface during the 60% straw case. The detected signal change could be correlated to an increased share of chlorine in the fine particles (in the PF and the CFB test rigs) and deposits (only in the CFB tests). Interestingly, a smaller signal change was detected during the 40% straw case in the PF combustion, in contrast to a larger signal gradient during the 40% case in the CFB tests. Two reasons could be identified for this behavior: On the one hand, the sensor used in the PF tests showed a lower sensitivity due to a different design of the sensor head. On the other hand, a significant amount of chlorine was detected in the aerosolic particles in the CFB tests in contrast to no chlorine in the PF experiments during this case. The known interaction mechanisms of alkali mitigation during combustion of difficult fuels (sulfation and embedding in alumino-silicates), which lead to a chlorine reduction in the fine particles, were investigated thoroughly. It was found that sulfation might be more pronounced under conditions typical of CFB systems.

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Section: Introductionmentioning

confidence: 99%

Online Corrosion Measurements in Combination with Deposit and Aerosol Analysis during the Co-firing of Straw with Coal in Electrically Heated, Small-Scale Pulverized Fuel and Circulating Fluidized Bed Systems

et al. 2018

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“…Corrosive behavior of high alkaline biomass co-combustion flue gas was studied by Stephan et al (2017) [128]. Straw and various coals were tested in a laboratory rig.…”

Section: Slagging Fouling Corrosion and Ash Propertiesmentioning

confidence: 99%

Advances in Biomass Co-Combustion with Fossil Fuels in the European Context: A Review

et al. 2021

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Co-combustion of biomass-based fuels and fossil fuels in power plant boilers, utility boilers, and process furnaces is a widely acknowledged means of efficient heat and power production, offering higher power production than comparable systems with sole biomass combustion. This, in combination with CO2 and other greenhouse gases abatement and low specific cost of system retrofit to co-combustion, counts among the tangible advantages of co-combustion application. Technical and operational issues regarding the accelerated fouling, slagging, and corrosion risk, as well as optimal combustion air distribution impact on produced greenhouse gases emissions and ash properties, belong to intensely researched topics nowadays in parallel with the combustion aggregates design optimization, the advanced feed pretreatment techniques, and the co-combustion life cycle assessment. This review addresses the said topics in a systematic manner, starting with feed availability, its pretreatment, fuel properties and combustor types, followed by operational issues, greenhouse gases, and other harmful emissions trends, as well as ash properties and utilization. The body of relevant literature sources is table-wise classified according to numerous criteria pertaining to individual paper sections, providing a concise and complex insight into the research methods, analyzed systems, and obtained results. Recent advances achieved in individual studies and the discovered synergies between co-combusted fuels types and their shares in blended fuel are summed up and discussed. Actual research challenges and prospects are briefly touched on as well.

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“…Co-combustion of biomass in pulverized coal firing utility boilers was investigated by many researchers. One of the early, detailed studies is due to Hein and Spliethoff (1995), who experimentally investigated the co-combustion of biomass in pulverized fuel and fluidized bed systems, which was extended to the investigation of the slagging (Heinzel et al, 1998) and corrosion behaviour (Stephan et al, 2017) in further studies. Nitrogen oxide (NOx) emissions were in the focus of the experimental investigations of Nimmo et al (2010) and Munir et al (2011).…”

Section: Introductionmentioning

confidence: 99%

COMPUTATIONAL ANALYSIS OF PULVERIZED COAL CO-FIRING WITH BIOMASS IN 150MWe UNIT OF TUNCBILEK THERMAL POWER PLANT

Deniz

Böke

Aydin

et al. 2021

Isı Bilimi Ve Tekniği Dergisi

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Pulverized coal and biomass co-firing in the 150MWe unit of Tuncbilek power plant is computationally investigated, within the scope of a preliminary feasibility study. The considered furnace, burning Turkish lignite, has totally eighteen burners, positioned at three different levels. First, the pulverized coal combustion in the furnace is calculated and the predicted temperatures in the boiler first pass are compared with the previous measurements. Subsequently, a co-firing scenario is computationally analyzed, where the burners of the lowest level that supply 43% of the total fuel mass are fed by biomass, instead of coal. Turkish red pine is assumed to be the source of the biomass. In replacing the coal by biomass, the mass flow rates of the biomass and the corresponding air are adjusted in such a way that the thermal load and the equivalence ratio remain unaltered. Due to the lack of more accurate data for the biomass, the rate constants for the pyrolysis and chemical conversion of biomass are assumed to be the same as those of coal, along with the assumption of the same particle size distribution for both fuels. It is observed that the resulting flame structure for the case of co-firing is very similar to that of coal combustion. This result is encouraging for the application of biomass co-firing in the considered furnace.

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Online corrosion measurements in small- and mid-scale during pulverised biomass/coal co-combustion

Cited by 5 publications

References 13 publications

Online Corrosion Measurements in Combination with Deposit and Aerosol Analysis during the Co-firing of Straw with Coal in Electrically Heated, Small-Scale Pulverized Fuel and Circulating Fluidized Bed Systems

Online Corrosion Measurements in Combination with Deposit and Aerosol Analysis during the Co-firing of Straw with Coal in Electrically Heated, Small-Scale Pulverized Fuel and Circulating Fluidized Bed Systems

Advances in Biomass Co-Combustion with Fossil Fuels in the European Context: A Review

COMPUTATIONAL ANALYSIS OF PULVERIZED COAL CO-FIRING WITH BIOMASS IN 150MWe UNIT OF TUNCBILEK THERMAL POWER PLANT

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