Experimental study on the effects of reheat temperatures on the ammonium bisulfate and ash blend deposition

Ni, Yuguo; Yan, Ruijian; Yu, Xinfeng; Huang, Shengyao; Xue, Xue; Zhou, Hao

doi:10.1016/j.fuel.2022.124719

Cited by 5 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Powder samples from four cases were analyzed by TGA in a 100% N 2 environment. Following the same temperature settings as the previous study, 27 all samples were heated from 50°C to 1000°C at a rate of 15°C/min and then maintained at 500 and 800°C for 30 min, respectively. In the meantime, the same test was performed on the fly ash for reference.…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the goal of this work was to investigate how heating time affected the removal of the fly ash and ABS blend deposition that had formed, so the ABS and fly ash premixing had little impact on the experiment. Given that ABS would start decomposing at 345°C, 15 on one hand, and considering on the other hand the results of our previous work, 27 in order to avoid the rapid decomposition of ABS and AS caused by a higher temperature (along with energy waste), the heating temperature for this set of experiments was set at 365°C, slightly above the 345°C threshold. The experiment was separated into three stages: (1) the deposition stage for 120 min, (2) the heating stage, and (3) the cooling stage for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…Our previous work investigated the effects of different reheat temperatures on the ABS and ash blend deposition. Reheating is proven to be an efficient way to remove blend deposition, and 365°C is considered the best reheat temperature 27 . But the heating time is fixed, not a variable.…”

Section: Introductionmentioning

confidence: 99%

“…Reheating is proven to be an efficient way to remove blend deposition, and 365 C is considered the best reheat temperature. 27 But the heating time is fixed, not a variable. So the decomposition characteristics of blend deposition during the heating process are unclear.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Study on the decomposition characteristics of ammonium bisulfate and fly ash blend deposition during the heating process

Yan

et al. 2023

Env Prog and Sustain Energy

Self Cite

View full text Add to dashboard Cite

Ammonium bisulfate (ABS; NH4HSO4) and ash blend deposition endanger the boiler's safety by blocking and corroding air preheater in coal‐fired power plants. In this work, a self‐heating probe was used to investigate the decomposition characteristics of ABS and fly ash blend deposition after heating at 365°C for 5, 15, and 30 min. The results showed that after heating for 15 min, ash deposition was peeled off from the probe surface. When it came to 30 min, the metal surface of the probe could be seen. Scanning electron microscope (SEM) results showed that extending the heating time could alleviate the agglomeration of ash particles. After the deposition stage, the stable relative heat flux density was about 0.868, and it increased after heating. When the heating time was 5, 15, and 30 min, it was 0.954, 0.978, and 0.989, respectively. According to X‐ray diffraction (XRD) results, the main minerals in the deposition were quartz, mullite, tschermigite (NH4Al(SO4)2·12H2O), CaSO4, ammonium sulfate (AS; (NH4)2SO4), ABS, (NH4)3Al(SO4)3, and godovikovite (NH4Al(SO4)2). The thermal gravimetric analyzer (TGA) results indicated that after heating, the total content of ABS and AS in cases 1 ~ 4 was 2.03%, 1.33%, 0.75%, and 0.70%, respectively. This work can assist in air preheater design and ash deposition removal.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Study on the decomposition characteristics of ammonium bisulfate and fly ash blend deposition during the heating process

Yan

et al. 2023

Env Prog and Sustain Energy

Self Cite

View full text Add to dashboard Cite

show abstract

“…In recent years, many researchers have investigated the formation mechanism and the influence factors of the ash deposition of ABS on air preheaters. The ash deposition caused by ABS is a complex process that is influenced by many factors, such as the concentrations of NH 3 and SO 3 , the ash particles, and the flue gas temperature [22]. Chen et al [16] investigated the corrosion and the viscous ash deposition characteristics of the rotary air preheater in a 300 MW coal-fired power plant through experimental research and proposed the coupling formation model of the corrosion and the viscous ash deposition.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study on Adhesive Ash Deposition Characteristics of Ammonium Bisulfate in Conditions Simulating an Air Preheater for Hard Coal Combustion

Chen,

Ji,

Feng

et al. 2023

Energies

View full text Add to dashboard Cite

The ash blockage of the rotary air preheater is a serious problem of the coal-fired boiler that urgently needs to be solved, which is caused by the adhesive deposition of ammonium bisulfate (ABS) and the fly ash. A comprehensive experimental study was performed to investigate the adhesive ash deposition characteristics based on an experimental platform established. The influences of the gas temperature, the gas velocity, the mass ratio of the ABS to the fly ash (R), and the ash particle size on the ash deposition characteristics were mainly analyzed and discussed under different conditions. The experimental results indicate that the liquid ABS is the root cause of the ash particles adhering to the heat transfer elements of the air preheater. The experimental results indicate that when the gas temperature is in the range of 420–493 K, the ABS ash deposition intensity and the ABS adhesion rate both increase with the increase in the gas temperature. When it is 493 K, the ABS adhesion rates of the corrugated plate and the positioning plate both reach maximum values, which are 31.7% and 27.9%, respectively. With the decrease in gas velocity, the total ash deposition intensity, the ABS ash deposition intensity, the ABS adhesion rate, and the growth rate of the ABS adhesion all increase. The content of ABS in the fly ash is also an important factor. When R rises, the ash deposition intensity and the ABS adhesion rate increase significantly. The particle size of the fly ash has little influence on the total ash deposition intensity, but has a great influence on the ABS ash deposition intensity and the ABS adhesion rate. With the increase in the particle size in the range of 30.8–100 μm, the ABS ash deposition intensity decreases by nearly 50%, and the ABS adhesion rates of plates A and B decrease by about 43.9% and 49.6%, respectively. According to the study results, some effective measures can be taken to solve the ash blocking problem of the rotary air preheater, including using the steam air heater, optimizing the operation parameters of the soot blower, and inhibiting ABS formation.

show abstract

Flow and thermal mixing characteristics of a multi-jet bypass flue with main flue baffles

Zhang,

Zhang

et al. 2024

Applied Thermal Engineering

View full text Add to dashboard Cite

Experimental study on the effects of reheat temperatures on the ammonium bisulfate and ash blend deposition

Cited by 5 publications

References 16 publications

Study on the decomposition characteristics of ammonium bisulfate and fly ash blend deposition during the heating process

Study on the decomposition characteristics of ammonium bisulfate and fly ash blend deposition during the heating process

Laboratory Study on Adhesive Ash Deposition Characteristics of Ammonium Bisulfate in Conditions Simulating an Air Preheater for Hard Coal Combustion

Flow and thermal mixing characteristics of a multi-jet bypass flue with main flue baffles

Contact Info

Product

Resources

About