Influence of Coal Composition and Operating Conditions on the Release of Alkali Species During Combustion of Hard Coal

Oleschko, Holger; Müller, Michael

doi:10.1021/ef700400j

Cited by 45 publications

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most likely, the extra amount of Cl with increasing turkey manure share of the blends can effectively enhance the release of both 58 NaCl + and 74 KCl + , which leads to decreasing release of 36 HCl + . A likely explanation for the positive deviation between the calculated and the experimental data of 58 NaCl + for turkey manure hard coal blends can be given by the exchange reaction of Na-aluminosilicates with K as published for hard coal and lignite by Oleschko et al 16,17 ■ MEAT BONE AND COAL…”

Section: ■ Turkey Manure and Coalmentioning

confidence: 88%

Co-Gasification of Turkey Manure and Meat Bone with Hard Coal and Lignite: Release of Condensable and Noncondensable Species

Bläsing¹,

Oga²,

Müller³

2017

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Turkey manure and meat bone have potential uses as fuel in conventional power plants. It is commonly agreed that problems can arise from uncommonly high contents of chlorine, sulfur, and alkali metals in turkey manure and meat bone, including corrosion, fouling, and inactivation of catalysts and membranes. Numerous studies have focused on the reactions of inorganics from combustion and pyrolysis of meat bone, and the thermochemical conversion of turkey manure has been in investigated to a much lesser extent. Gasification techniques of biomass waste (e.g., manure) has been reviewed recently, but the gaseous inorganic species have not been directly determined in high-temperature product gas during the gasification and co-gasification of meat bone and turkey manure. In the present study, turkey manure and meat bone are gasified under temperature conditions of entrained flow gasification (1673 K). The two waste biomasses are used in pure form and in blends with lignite and hard coal. Significant condensable and noncondensable inorganics are detected in situ in the high-temperature gas, using molecular beam mass spectrometry (MBMS).

show abstract

Section: ■ Turkey Manure and Coalmentioning

confidence: 88%

Co-Gasification of Turkey Manure and Meat Bone with Hard Coal and Lignite: Release of Condensable and Noncondensable Species

Bläsing¹,

Oga²,

Müller³

2017

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…To predict the fouling and slagging tendencies of the biomass experimental fuels, in order to study possible countermeasures to these phenomena [34][35][36], some research has developed a series of numerical correlations to assign a value to the proportion of certain components to others. These correlations are the so-called fouling indexes [37][38][39][40].…”

Section: Deposition Indexesmentioning

confidence: 99%

Viability of Agricultural and Forestry Residues as Biomass Fuels in the Galicia-North Portugal Region: An Experimental Study

et al. 2020

View full text Add to dashboard Cite

In this study, an experimental approach was utilized to assess the viability of three biomass fuels in a small laboratory-scale combustor. Three feedstocks currently considered as residues were selected based on their widespread presence in the Euroregion Galicia-North Portugal, and some were modified to improve their behavior by removing fine particles or adding substances to increase the melting point of the ashes. The experimental facility was a highly modifiable, fixed-bed combustor with air-staging capabilities and a wide array of sensors intended to measure a large quantity of parameters. A series of tests was performed to cover the widest range of total air flows possible for the facility, with values of 0.223, 0.279 and 0.334 kg/m²s being used, while 30% of the total air flow enters from below the combustion bed and 70% over it. Results from the proximate and elemental analyses show high proportions of ash in every fuel compared to commercial wood pellets, and empirical deposition indexes suggest a high risk of fouling and slagging. Testing confirmed the analysis predictions, resulting in the kiwi- and vine-based fuels not being suitable for a facility without ash elimination systems. Some modifications of the gorse fuel showed improved behavior compared to unmodified gorse fuel, namely, the addition of a 2% mass fraction of CaCO3 and the removal of fine particles. The former prevented ash sintering, and the latter greatly decreased the fouling of the heat exchanger tubes. These results suggest that some of the vegetal species studied might be suitable for their use in small-scale biomass burners, and besides the accuracy of one of the deposition indexes used is confirmed.

show abstract

“…A lot of research has shown that the slagging and fouling on heating surfaces during coal combustion are usually related to alkali metal elements Na and K [16][17][18][19][20][21][22]. As shown in Table 4, the ash in the flue gas exhausted from the ferrosilicon electric furnace has high Na and K contents, which leads to easy slagging and fouling.…”

Section: Slagging Mechanismmentioning

confidence: 99%

Slagging and Fouling Characteristics of HRSG for Ferrosilicon Electric Furnaces

Wang

Chen

et al. 2015

Energies

View full text Add to dashboard Cite

Abstract:The slagging and fouling characteristics of the heat recovery steam generator (HRSG) for ferrosilicon electric furnaces are discussed in this paper. Three ash samples were taken from the HRSG of a ferrosilicon furnace in Ningxia Province, China, which suffered from serious slagging and fouling. X-ray fluorescence (XRF), X-ray powder diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the ash samples. The results show that low melting point salt Na2SO4 and composite salts Na (AlSi3O8) and 3K2SO4· CaSO4 deposit on the superheater tube walls in aerosol form and solidify to form the initial slag layer. With the continuous deposition of the low melting point compounds, more and more ash particles in the flue gas adhere to the slag surface to form a thicker slag. Low melting point composite salt NaO· Al2O3· SiO2 is absorbed on the evaporator tube walls in aerosol form. With the deposition of NaO· Al2O3· SiO2, more and more ash particles are absorbed to form the fouling. Since there is less space between pin-finned tubes, the large iron-rich slag particles are easily deposited on tube walls and fin surfaces, which is advantageous to the fouling process. There are large quantities of superfine ash particles in the flue gas that easily adhere to other particles or tube walls, which facilitates the slagging and fouling process. OPEN ACCESSEnergies 2015, 8 1102

show abstract

Influence of Coal Composition and Operating Conditions on the Release of Alkali Species During Combustion of Hard Coal

Cited by 45 publications

References 13 publications

Co-Gasification of Turkey Manure and Meat Bone with Hard Coal and Lignite: Release of Condensable and Noncondensable Species

Co-Gasification of Turkey Manure and Meat Bone with Hard Coal and Lignite: Release of Condensable and Noncondensable Species

Viability of Agricultural and Forestry Residues as Biomass Fuels in the Galicia-North Portugal Region: An Experimental Study

Slagging and Fouling Characteristics of HRSG for Ferrosilicon Electric Furnaces

Contact Info

Product

Resources

About