The effects of solid absorbents on the emission of trace elements, SO2, and NOx during coal combustion

Cheng, Juntao; Zeng, Hongtao; Zhang, Z. H.; Xu, M. H.

doi:10.1002/er.739.abs

Cited by 6 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, smaller particles have greater surface area and more internal pores, which can enhance the reaction between trace element-containing vapors and absorbents. Desulfurization efficiency at 1100°C, measured by Cheng et al, 22 Few reports exist on the combination of sorbent and RDF or MSW cofiring with coal. Waste materials can be combusted for heat generation, while sorbents react with flue gas and capture SO 2 and HCl, provided they can be combined in a single particle.…”

Section: Introductionmentioning

confidence: 99%

ReEngineered Feedstocks for Pulverized Coal Combustion Emissions Control

Zhu

Chu

Tompsett

et al. 2014

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

New coal reaction technology called ReEngineered Feedstock (ReEF), consisting of post-recycled paper and plastics, was evaluated for combustion emissions control when cofiring with pulverized coal. Experiments were conducted with four types of ReEF in a 2 in. diameter laboratory-scale fluidized bed combustor system heated to 1200, 1400, and 1600°C. Flue gas emission was continuously monitored with an online infrared multigas analyzer and mass spectrometer. The results indicate that co-firing ReEF with coal provides SO 2 emission reduction in flue gas up to 85% and moderate decrease in NO emissions, as well as higher carbon conversion than pure coal combustion. ReEF, slag and fly ash solids were were analyzed by X-ray diffraction; identification of sulfates in the product ash conclusively supports the mechanism of in situ sulfur capture.

show abstract

Section: Introductionmentioning

confidence: 99%

ReEngineered Feedstocks for Pulverized Coal Combustion Emissions Control

Zhu

Chu

Tompsett

et al. 2014

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…For example, silica was predicted to capture more than 80% of Pb between 600 and 1600 K, but it was less effective for the capture of Ni compared to alumina. Cheng et al 7 used five solid sorbents to capture Pb, Cd, Cr, and As, including CaCO 3 , CaO, CaSO 4 , bauxite, and kaolinite. They found that kaolinite has the highest capture efficiency for Pb and bauxite has the highest capture efficiency for Cd.…”

Section: Introductionmentioning

confidence: 99%

Effects of CaO and CaCO₃ on Heavy Metal Capture in Bottom Ash during Municipal Solid Waste Combustion under a CO₂/O₂ Atmosphere

et al. 2017

View full text Add to dashboard Cite

Experiments were conducted to investigate the influence of CaO and CaCO3 on the capture efficiency of heavy metals during the combustion of municipal solid waste (MSW) in CO2/O2 and N2/O2 atmospheres. Six heavy metal elements were studied in this paper, including Pb, Cd, Cu, Cr, Ni, and Zn. On the basis of the results, the operating temperature has a great effect on the transformation of Pb and Cd, while the amount of Cu, Cr, and Ni in the bottom ash are affected only slightly by changes in the temperature and atmosphere. The volatilization of Cd, Cu, Cr, and Zn marginally decreased with the addition of CaCO3 or in a CO2/O2 atmosphere (oxy-fuel combustion). The X-ray diffraction results show that CaO and CaCO3 have the same ability to capture heavy metals under CO2/O2 and N2/O2 atmospheres as a result of the reaction of CaO with CO2. Thermodynamic equilibrium calculations indicate that CaO or CaCO3 could barely hinder the volatilization of heavy metals by chemical reactions with the heavy metals but might hinder their volatilization by their physical adsorption. The initial forms of the heavy metals in the MSW may be another factor that affects the volatilization of the heavy metals. The importance of these forms is indicated by these six heavy metals having similar enrichment behaviors in both the CO2/O2 and N2/O2 atmospheres with CaO or CaCO3 additives; the calculations predict that these heavy metals have the same main species, except for a slight change in the content of these species.

show abstract

“…According to Figure 4 and the discussion above, when the addition of CaO was 4%, it could better fix HMs in the bottom slag during the process of incineration, which was consistent with the literature data. 23 …”

Section: Resultsmentioning

confidence: 99%

Comprehensive Evaluation of the Control Efficiency of Heavy-Metal Emissions during Two-Step Thermal Treatment of Sewage Sludge

Fang

Teng

et al. 2020

ACS Omega

View full text Add to dashboard Cite

Recycling the phosphorus in sludge by incineration has received great interest at home and abroad. However, heavy metals (HMs) is a restrictive factor for SS thermal treatment. In this study, a comprehensive evaluation method was adopted to evaluate the comprehensive control efficiency of HM emissions during two-step thermal treatment (incineration–calcination). The effects of temperature, calcination time, and additives (CaO and NaCl) on leaching rates, stabilized rates, and comprehensive control efficiency of HM emissions were investigated. Results showed that comprehensive control efficiency increased significantly with an increase of temperature because of the transformation of chemical speciation from a leachable to a more stable combined form. Additives Cao and NaCl promoted the volatilization of HMs and reduced the comprehensive control efficiency. The highest comprehensive control efficiency of HM emissions was 78% when the incineration temperature reached 950 °C. Furthermore, a comparison was made between leaching rates, stabilized rates, and a comprehensive evaluation method. The results were inconsistent when leaching rates and stabilized rates were adopted. In contrast, when the comprehensive evaluation method was used, the results were coordinated and unique. This work can provide a promising approach for the evaluation of control efficiency of HM emissions during the process of thermal treatment of sludge.

show abstract

The effects of solid absorbents on the emission of trace elements, SO2, and NOx during coal combustion

Cited by 6 publications

References 0 publications

ReEngineered Feedstocks for Pulverized Coal Combustion Emissions Control

ReEngineered Feedstocks for Pulverized Coal Combustion Emissions Control

Effects of CaO and CaCO₃ on Heavy Metal Capture in Bottom Ash during Municipal Solid Waste Combustion under a CO₂/O₂ Atmosphere

Comprehensive Evaluation of the Control Efficiency of Heavy-Metal Emissions during Two-Step Thermal Treatment of Sewage Sludge

Contact Info

Product

Resources

About

The effects of solid absorbents on the emission of trace elements, SO2, and NOx during coal combustion

Cited by 6 publications

References 0 publications

ReEngineered Feedstocks for Pulverized Coal Combustion Emissions Control

ReEngineered Feedstocks for Pulverized Coal Combustion Emissions Control

Effects of CaO and CaCO3 on Heavy Metal Capture in Bottom Ash during Municipal Solid Waste Combustion under a CO2/O2 Atmosphere

Comprehensive Evaluation of the Control Efficiency of Heavy-Metal Emissions during Two-Step Thermal Treatment of Sewage Sludge

Contact Info

Product

Resources

About

Effects of CaO and CaCO₃ on Heavy Metal Capture in Bottom Ash during Municipal Solid Waste Combustion under a CO₂/O₂ Atmosphere