Effect of blending sewage sludge with coal on combustion and ash slagging behavior

Guo, Shuai; Yang, Qing; Liang, Honglin; Che, Deyong; Liu, Hongpeng; Sun, Baizhong

doi:10.1039/c9ra04243a

Cited by 16 publications

(3 citation statements)

References 53 publications

(59 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vermiculite can also reduce ash deposition because of minerals with high melting points, such as forsterite and enstatite, which can cover the surface of viscous particles and reduce viscosity [5]. When sludge is blended with ZD coal, a large amount of alkali metal phosphate can be produced, which increases the AFTs [6,7]. The oil shale semi-coke can also be co-fired with ZD coal, as a result of both calcium and sodium sulphate salts in the deposits decrease, and aluminosilicate with low cohesiveness appears [8].…”

Section: Introductionmentioning

confidence: 99%

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Wang

Zhu

et al. 2021

IET Renewable Power Gen

View full text Add to dashboard Cite

The high content of the AAEMs in Zhundong (ZD) coal causes easily slagging on the heating surface of boilers, and the addition of rice husk hydrochar (RHC) is expected to alleviate slagging by introducing SiO2 content. ZD coal is co‐fired with RHC according to different blend ratios, co‐combustion ashes are prepared subsequently at different temperatures. The co‐combustion characteristics of blends are studied firstly by using TGA, considering the combustion process can bring impacts on ash characteristics. Then the effects of the blend ratio and ashing temperature on the ash characteristics are discussed. The ash samples are characterized by XRF, ICP‐AES, XRD and SEM. The results show that an increase in the blend ratio of the RHC reduces the ignition temperature and lengthens the burnout time, which transforms the ash characteristics. The contents of quartz, gehlenite and andalusite greatly increase. The number of fine particles in the ash decreases, while the particle size increases. The ash fusion temperatures (AFTs) are at the lowest value at 8:2 and exceed totally that of ZD coal at 7:3. Considering to increase the AFTs of ZD coal, at least the blend ratio of 7:3 of ZD coal and RHC is recommended for co‐combustion.

show abstract

Section: Introductionmentioning

confidence: 99%

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Wang

Zhu

et al. 2021

IET Renewable Power Gen

View full text Add to dashboard Cite

show abstract

“…Zhang (2013) researched the combustion of pulverized coal mixed with sludge, indicating that the greater the proportion of pulverized coal, the greater the weight loss. Guo et al (2019) achieved the similar results that investigated the influence of blending ration between Zhundong Coal and sewage sludge on combustion, the weight loss gradually decrease with an increase in the sludge blending ratio.…”

Section: Resultsmentioning

confidence: 70%

Novel approach to improving wastewater treatment and sewage sludge combustion using pulverized coal‐activated sludge

Sun

Ouche

et al. 2020

Water Environment Research

View full text Add to dashboard Cite

Sewage and sludge are usually treated separately. Considering improving sludge treatment while improving sewage treatment is beneficial to the synergetic effect of sewage treatment and sludge treatment. The efficiency of pulverized coal‐activated sludge (PAS) on contaminant removal, sludge calorific value, and combustion characteristic was investigated in contrast to conventional activated sludge (CAS) using the laboratory‐scale sequencing batch reactor (SBR). Results indicated that the average chemical oxygen demand, ammonium nitrogen, total nitrogen, and total phosphorus removal efficiency of PAS were highest under a dosage of 0.4 g/L, which were 98.56%, 94.22%, 68.60%, and 95.96%, respectively. The average effluent concentration satisfied the Level A discharge standard of pollutants for municipal wastewater treatment plants (GB18918‐2002). The calorific value and maximum weight loss of PAS gradually increased adjusting the dosage of pulverized coal. At the pulverized coal dosage of 0.2 g/L, the calorific value of PAS with 70% water content is 3,824.07 kJ/kg, which can satisfy the requirement of self‐maintained combustion. Overall, the pulverized coal can simultaneously improve the treatment of wastewater in SBR and promote the sludge combustion by increasing calorific value. Therefore, PAS system is an innovation based on improving the sewage treatment sludge combustion. Practitioner points An innovative method to simultaneously improving wastewater treatment and sewage sludge combustion using pulverized coal‐activated sludge was developed. The average COD, NH4+‐N, TN, and TP removal efficiency of PAS‐0.4 is best. The 70% moisture content sludge calorific values of 3,824.07 kJ/kg in PAS‐0.2 can satisfy the requirement of self‐maintained combustion.

show abstract

“…In this demonstration system, the coal−sludge blend was selected as the fuel, which would result in more pollutants (i.e., high concentrations of sulfur oxides, hydrogen chloride, etc.) 28 and hinder the flue gas treatment. To this end, the proximate and ultimate analyses of the fuel were conducted first.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Co-Benefits of Pollutant Removal, Water, and Heat Recovery from Flue Gas through Phase Transition Enhanced by Corona Discharge

Shao

Wang

Zhou

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

Pollutant removal and resource recovery from high-humidity flue gas after desulfurization in a thermal power plant are crucial for improving air quality and saving energy. This study developed a flue gas treatment method involving phase transition enhanced by corona discharge based on laboratory research and established a field-scale unit for demonstration. The results indicate that an adequate increase in size will improve the ease of particle capture. A wet electrostatic precipitator is applied before the condensing heat exchangers to enhance the particle growth and capture processes. This results in an increase of 58% in the particle median diameter in the heat exchanger and an emission concentration below 1 mg/m3. Other pollutants, such as SO3 and Hg, can also be removed with emission concentrations of 0.13 mg/m3 and 1.10 μg/m3, respectively. Under the condensation enhancement of the method, it is possible to recover up to 3.26 t/h of water from 200 000 m3/h saturated flue gas (323 K), and the quality of the recovered water meets the standards stipulated in China. Additionally, charge-induced condensation is shown to improve heat recovery, resulting in the recovery of more than 43.34 kJ/h·m3 of heat from the flue gas. This method is expected to save 2628 t of standard coal and reduce carbon dioxide emission by 2% annually, contributing to environmental protection and global-warming mitigation.

show abstract

Effect of blending sewage sludge with coal on combustion and ash slagging behavior

Cited by 16 publications

References 53 publications

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Novel approach to improving wastewater treatment and sewage sludge combustion using pulverized coal‐activated sludge

Co-Benefits of Pollutant Removal, Water, and Heat Recovery from Flue Gas through Phase Transition Enhanced by Corona Discharge

Contact Info

Product

Resources

About