Pilot-Scale Demonstration of the OSCAR Process for High-Temperature Multipollutant Control of Coal Combustion Flue Gas, Using Carbonated Fly Ash and Mesoporous Calcium Carbonate

The paper presents the results of research on the properties of fly ashes from the process of flue gas denitrification by selective non-catalytic reduction (SNCR), consisting of dosing urea into the coal combustion chamber. The research was carried out on two types of fly ash: Silica fly ash from flue gas denitrification and ash from a traditional boiler without the flue gas denitrification process. The scope of comparative studies included physicochemical and structural features of ashes, as well as slurries and mortars with the addition of ashes. Fly ash from denitrification, whose ammonia content at the time of sampling was 75 mg/kg at the maximum, was examined. Our own research has shown that fly ash from flue gas denitrification is characterized by a higher value of losses on ignition and ammonia content in comparison to ashes without denitrification. It was shown that the ammonia content in the analyzed range does not limit the use of fly ash as an additive to cement and concrete.

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Surface Characterization of the Mechanism for Decreased Boiler Slagging via Fly Ash Surface Modification

MRS Proceedings ◽

10.1557/proc-65-151 ◽

1985 ◽

Vol 65 ◽

Author(s):

Christopher J. Macey

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Surface Characterization ◽

Depth Profiling ◽

Pilot Scale ◽

Pulverized Coal ◽

Pulverized Coal Combustion ◽

Utility Boilers ◽

Combustion Experiment

ABSTRACTSlagging difficulties encountered in large, pulverized coal-fired utility boilers can be alleviated by using recently developed chemical conditioners designed to inhibit the agglomeration of molten fly ash particles. Slagging results from the impaction and accretion on the boiler interior surfaces of molten ash particles in the flue gas resulting from the combustion of coal. Electron Spectroscopy for chemical Analysis (ESCA) and ion sputtering depth profiling were utilized to examine the mechanism whereby a fuel conditioner containing copper oxychloride effectively reduced slag deposition rates during a pilot-scale, pulverized coal combustion experiment.

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Heat Stable Salt Accumulation and Solvent Degradation in a Pilot-Scale CO2 Capture Process Using Coal Combustion Flue Gas

Aerosol and Air Quality Research ◽

10.4209/aaqr.2013.05.0150 ◽

2014 ◽

Vol 14 (2) ◽

pp. 550-558 ◽

Cited By ~ 21

Author(s):

Jesse G. Thompson ◽

Reynolds Frimpong ◽

Joseph E. Remias ◽

Jim K. Neathery ◽

Kunlei Liu

Keyword(s):

Co2 Capture ◽

Flue Gas ◽

Coal Combustion ◽

Pilot Scale ◽

Salt Accumulation ◽

Capture Process ◽

Heat Stable

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Mercury Removal From Coal Combustion Flue Gas by Pyrite-Modified Fly Ash Adsorbent

10.21203/rs.3.rs-934628/v1 ◽

2021 ◽

Author(s):

Liqiang QI ◽

Xu WANG ◽

Wen WANG ◽

Jingxin LI ◽

Yan HUANG

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Coal Combustion ◽

Gas Flow ◽

Active Component ◽

Mercury Removal ◽

Gas Flow Rate ◽

Mercury Adsorption ◽

Mass Proportion ◽

Modified Fly Ash

Abstract Pyrite and fly ash have certain advantages in adsorption and mercury oxidation. The pyrite-modified fly ash (PY+AC-FA) mercury adsorbent was prepared by mixing pyrite (PY) with acid-modified fly ash (AC-FA), which has better mercury removal effect than AC-FA. The experimental results of mercury adsorption show: when the reaction temperature is 50°C, the best doping proportion of modified fly ash is 20wt%, the mass proportion of pyrite to acid modified fly ash is 4:1, and the flue gas flow rate is 1.0L/min, the adsorbent has the best performance, and the adsorption rate of mercury reaches 91.92%. BET, XRD, SEM, TG-DSG and XRF were used to characterize these adsorbents. And the mechanism of mercury removal of pyrite-modified fly ash adsorbent is inferred: Hg0 is first adsorbed on the surface of the adsorbent, and then oxidized to HgS by the active component FeS2 in pyrite-modified fly ash.

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Effect of CaO and Fe2O3 on Partitioning of As and S within Ash Fractions from Fluidised-Bed Co-Combustion of Coal and Wastes

The Open Fuels & Energy Science Journal ◽

10.2174/1876973x01811010081 ◽

2018 ◽

Vol 11 (1) ◽

pp. 81-90

Author(s):

Lucie Bartoňová

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Coal Combustion ◽

Bottom Ash ◽

Correlation Coefficients ◽

Fluidised Bed ◽

Solid Product ◽

Gas Cleaning

Possible interaction of volatilized As and S with CaO and Fe2O3 (creating solid product) could efficiently improve coal combustion flue gas cleaning. For this reason, S-CaO, As-CaO, S- Fe2O3 and As- Fe2O3 relationships were evaluated in bottom ash and fly ash fractions from fluidised-bed co-combustion of coal and wastes (and limestone as desulphurization additive) through calculation of correlation coefficients and composition of magnetic concentrates. It was concluded that S exhibited a dominant association with CaO while As exhibited affinity to both CaO and Fe2O3 - the significance differed a little in bottom ash and fly ash. In the bottom ash, the affinity of As to CaO was more significant, while in the fly ash the association to Fe2O3 slightly prevailed.

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