Correlation between the ash composition and melting temperature of waste incineration residue

Kim, Miran; Jang, Jeong-Gook; Lee, Sangkeun; Hwang, Bu-Yeon; Lee, Jea-Keun

doi:10.1007/s11814-010-0156-0

Cited by 10 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the combined Al 2 O 3 and SiO 2 content is often used as an empirical parameter to predict AFTs, especially the ash flow temperature. 33,34 We found that the total Al 2 O 3 + SiO 2 content in each ash sample was only 2.20, 2.49, 2.87, 1.50, and 0.76, respectively. However, the AFTs of ash sample 3, which had the most Al 2 O 3 + SiO 2 , were lower than those of ash sample 2.…”

Section: Results and Analysismentioning

confidence: 78%

Further Study on Ash Deposits in a Large-Scale Wastewater Incineration Plant: Ash Fusion Characteristics and Kinetics

Cai

Chen

et al. 2015

Energy Fuels

View full text Add to dashboard Cite

Ash deposition and fusion during the incineration of high-concentration organic wastewater rich in salt is complicated by various issues, resulting in severe operational problems, such as fouling, slagging, and even unscheduled shutdown. The fusion characteristics and melting kinetics of ash samples collected from an industrial-scale wastewater incineration plant were determined by ash fusion temperature tests, simultaneous thermal analysis, and X-ray powder diffractometry. The results showed that the ash fusion characteristics depended upon not only ash compositions but also mineralogy transformation and evolution. The major melting process of ash sample 1 was within the range of 1158−1196 K. Because of the existence of the low-temperature eutectic compounds Na 3 Fe(SO 4 ) 3 and Na 2 Ni(SO 4 ) 2 ·4H 2 O, the temperature ranges of melting processes of ash samples 2−4 were 200−300 K lower than that of ash sample 1. Weight loss processes in ash sample 5 continued over the whole furnace temperature range. The Coats−Redfern equation was used to approximately evaluate the ash melting kinetics. Ash sample 1 had the highest activation energy for an ash melting process (3125.31 kJ mol −1 ). Ash samples 2 and 5 had relatively moderate activation energies (729.15−1338.93 kJ mol −1 ). Ash samples 3 and 4 had the lowest activation energies (374.00 and 375.68 kJ mol −1 ), which indicated that Na 2 SO 4 melting required more energy than the melting of low-temperature eutectic compounds. The most probable reaction model for all of the melting processes was f(α) = (1 − α) 2 . The most probable reaction model for the melting process at 1163.0−1284.9 K in ash sample 3 was f(α) = (1 − α) 4 .

show abstract

Section: Results and Analysismentioning

confidence: 78%

Further Study on Ash Deposits in a Large-Scale Wastewater Incineration Plant: Ash Fusion Characteristics and Kinetics

Cai

Chen

et al. 2015

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The development of such prediction models requires substantial analysis data on melting temperature. Another alternative is the fluidity analysis method, which is relatively simple and easily reproducible; this has been proposed in various studies [8,11,16,[19][20][21][22][23].…”

Section: Evaluation Of Slag Flowability By Fluidity Measurementmentioning

confidence: 99%

Combustion Melting Characterisation of Solid Fuel Obtained from Sewage Sludge

et al. 2021

View full text Add to dashboard Cite

Solid fuelization technology can increase the heating value of sewage sludge such that it can be utilised as a fossil fuel substitutes. Reducing landfilling of bottom and fly ash resulting from heavy metals contained in sewage sludge is challenging. Hence, combustion melting technology (CMT), which can discharge bottom ash in the form of slag, has been proposed herein as an alternative to the conventional incineration technology. However, further research is required to improve the flowability of slag. Applicability of CMT for the stable treatment of heavy metals in the ash generated during the energisation of sewage sludge solid fuel has been reviewed. The change in the degree of fluidity was identified via a laboratory-scale fluidity measurement experiment following changes in melting temperature, mixing ratio of sewage sludge and sawdust, and basicity. The pouring index (PI) of sewage sludge solid fuel (pellet) was maintained at a level of about 60% at a basicity index of 0.8. Based on the results, the slagging rates and volume reduction rates, exhaust gas analysis, and heavy metal elution characteristics under oxygen enrichment were derived from a 2 ton/day combustion melting pilot plant experiment; thereafter, the feasibility of combustion melting of sewage sludge solid fuel was determined.

show abstract

“…In order to successful slagging, the operation temperature must be higher than the temperature when the viscosity is 25 Pa•s. In addition, the suitable operation temperature can reduce oxygen and feedstock consumptions, extend refractory life and reduce costs, which is beneficial to yield product efficiently [9]. However, determination of the operational condition is not only closely related to the slagging viscosity but also to the rheology of slag, because the characters of rheology can be used to predict the change of viscosity.…”

Section: Introductionmentioning

confidence: 99%

Rheology and Viscosity Prediction of Bituminous Coal Slag in Reducing Atmosphere

Zhao¹,

Xu²,

Huo³

et al. 2015

J Chem Eng Process Technol

View full text Add to dashboard Cite

The high-temperature rheology of bituminous coal slag in the reducing atmosphere was investigated in this study. The characteristics of slag sample were analyzed by multi-techniques. The rheological measurement of the slag was carried out by a high-temperature rheometer at temperatures of 1360-1460℃. The effects of the shear rate and temperature on the rheological property of the slag were studied. The volume fractions of crystallize particles and mineral matters variation were predicted by thermodynamic software FactSage. The results show that the viscosity and shear stress of the slag increase with decreasing temperature at the constant shear rate. When the volume fraction of the crystallize particles is less than 10%, the slag behaves as a Newtonian fluid. When the volume fraction of the crystallize particles is more than 15%, the slag viscosity decreases with increasing shear rate. The non-Newtonian fluid behavior of slag is illustrated by shear thinning behavior and thixotropic behavior. With decreasing temperature, the shear thinning behavior becomes increasingly significant. In addition, the viscosity prediction model basing on S2 model and Einstein-Roscoe model was established.

show abstract

Correlation between the ash composition and melting temperature of waste incineration residue

Cited by 10 publications

References 9 publications

Further Study on Ash Deposits in a Large-Scale Wastewater Incineration Plant: Ash Fusion Characteristics and Kinetics

Further Study on Ash Deposits in a Large-Scale Wastewater Incineration Plant: Ash Fusion Characteristics and Kinetics

Combustion Melting Characterisation of Solid Fuel Obtained from Sewage Sludge

Rheology and Viscosity Prediction of Bituminous Coal Slag in Reducing Atmosphere

Contact Info

Product

Resources

About