Tar from biomass/coal-containing briquettes. Evaluation of PAHs

Abstract

The tar derived from the pyrolysis of four briquettes especially prepared for use in cokemaking was studied. The composition of the briquettes included biomass, coal and coal tar as binder. Bio-briquettes can be considered as an alternative ecological fuel and used as a source of energy. Pyrolysis was carried out in order to produce tars.This work studies the effect of adding a sawdust waste on the characteristics of pyrolysis tars. In addition, the tars obtained from bio-briquettes and from biomass-free briquettes were compared. It was found that biomass reduces the amount of sulphur.The aromaticity of bio-tars was found to be lower than that of the tars from the biomass-free briquettes. They therefore contribute less to carcinogenicity, but they have more oxygenated groups.

Comprehensive Two-Dimensional Gas Chromatography and Its Application to the Investigation of Pyrolytic Liquids

“…Gas chromatography with mass spectrometric detection (GC/MS) is commonly employed for the analysis of volatile fractions of liquids derived from coal [65,66,[78][79][80][81][82] including also the use of an analytical pyrolyzer as injector [83]. However, other detectors are also employed, such as flame ionization detector (FID) [84][85][86] and atomic emission detector (AED) [87].…”

Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature

“…As a by-product of the coking industry, coal tar mainly consists of phenols, aliphatic hydrocarbons and large amounts of PAHs. 11 However, PAHs are among the most common organic components in highly carcinogenic substances; this results in challenging application of coal tar and environmental pollution. 12 However, for biomass tar, the components are mainly oxygenated components and small amounts of low-aromatic PAHs; 7 thus, biomass tar is much cleaner than coal tar.…”

“…Furthermore, biomass is a renewable fuel, and its addition to coal during high temperature pyrolysis will not only decrease non-renewable carbon emissions but also has the potential to decrease the production of PAHs. 11 Consequently, new insight into producing clean biomass-coal tar by adding biomass to coal during high temperature pyrolysis is extremely valuable.…”

“…23 In addition, added biomass (sawdust) can decrease the aromaticity of tar obtained from the pyrolysis of blends at 900 C and increase the amounts of oxygenated groups, which contribute less to carcinogenicity. 11 However, because previous studies have made many contributions to the tar formation of individual coals, biomasses or biomass-coal blends, systematic analysis of the tar formed from co-pyrolysis of coal and biomass at high temperature is still needed, especially for different biomass addition levels. This work studies the effects of biomass (poplar) on tar formation during co-pyrolysis of biomass and coal at high temperature; special attention is paid to the poplar addition levels to better optimize the production of biomass-coal tar.…”

Analysis of Mold Overall Deformation and Contact Stress During Biomass Cold Compression Molding

“…Besides, the difficult scale and efficient utilization and poor economic benefit are the major elements restricting the pace of turning biomass into commodity energy. Among the technologies developing and utilizing biomass energy, biomass solidification forming technology can process the low-grade biomass raw material into efficient and clean briquettes fuel, which solves the problems of high biomass storage and transportation cost and greatly enhances the utilization efficiency of biomass resources [1][2][3][4] . The use of solid after molding is so extensive that, it can be used as the raw material of living burning [5][6][7] , thermal power generation [8], and gasification [9]; so it plays important supporting role in the development of entire biomass energy industry.…”