Dry gas cleaning process by adsorption of H2S into activated cokes in gasification of carbon resources

Itaya, Yoshinori; Kawahara, Kazunori; Lee, Chi-Woong; Kobayashi, Jun; Kobayashi, Nobusuke; Hatano, Shigenobu; Mori, Shigekatsu

doi:10.1016/j.fuel.2009.04.005

Cited by 30 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Particulates can be efficiently removed with cyclones or electrostatic precipitators . H 2 S, tars, and SO 2 can be removed by wet scrubbing. , Although wet scrubbing is a well-proven method that is widely applied to handle impurities in the raw gas from gasification processes, the treatment and disposal of the wastewater may entail economic and environmental challenges for the overall process. ,− Furthermore, the thermal efficiency of the process can be decreased, as all the sensible heat of the raw gas from the gasification process is lost in the scrubbing process . To mitigate these effects, various hot gas cleaning methods are being developed. ,,− In some of these methods, AC is used as a catalyst support or, in some rare cases, is used without any catalyst. − For example, Fe-supported AC has been shown to reduce significantly the concentration of H 2 S (from 200 to 1 ppm) in a simulated product gas .…”

Section: Introductionmentioning

confidence: 99%

Production of Activated Carbon within the Dual Fluidized Bed Gasification Process

Tchoffor

Davidsson²,

Thunman

2015

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A key step in the production of clean energy from biomass gasification is the cleaning of the product gas to remove impurities, such as tars, H2S, HCl, particulates, and alkali compounds. Some gas cleaning systems employ activated carbon (AC), with Brunauer–Emmett–Teller (BET) surface areas in the range of 800–1300 m2/g. Because the operational conditions for the production of AC are similar to those applied in the gasification chamber of a dual fluidized bed gasifier, the possibility to produce AC within the dual fluidized bed gasification (DFBG) process was investigated in the present work. Wood pellets were gasified with steam in a fluidized bed reactor at 800 and 840 °C. Part of the unconverted char from this process was further activated with steam in a fixed bed reactor at 850 °C. The results obtained indicate that if ≥44% of the char that results from the devolatilization of the wood pellets is gasified (the extent of char conversion), the unconverted char acquires a BET surface area >900 m2/g, which makes it suitable for use in gas cleaning processes. Achieving this extent of char conversion in the gasification chamber of industrial dual fluidized gasification plants would remove the need and cost for a second reactor for further activation of the unconverted char. The cost of the produced activated carbon (AC) has been estimated as being 15-fold lower than that of commercially available AC. This suggests that the production of AC as part of the dual fluidized bed gasification process would be cost-effective.

show abstract

Section: Introductionmentioning

confidence: 99%

Production of Activated Carbon within the Dual Fluidized Bed Gasification Process

Tchoffor

Davidsson²,

Thunman

2015

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…By using the formulas for the pressure dependence of the adsorption capacity given in this paper, the adsorption capacity at 100 bar, which is the pressure used in our aquathermolysis experiments, could be estimated to 2.9 g H 2 S / g adsorbent. Itaya et al (2009) have studied the adsorption of H 2 S on activated coke, in particular the effect of temperature at atmospheric pressure. The observed trend is an increase of H 2 S adsorption with temperature up to 150 °C, then a decrease.…”

Section: Discussionmentioning

confidence: 99%

Forecasting of H2S Production due to Aquathermolysis Reactions

Barroux

Lamoureux-Var

Flauraud

2013

SPE Middle East Oil and Gas Show and Conference

View full text Add to dashboard Cite

Steam injection has been recognized as an efficient process for recovering hydrocarbons from heavy oil and bitumen reservoirs. However, it is now well known that the steam injection induces chemical reactions within the reservoir, called aquathermolysis and yielding acid gases. Hydrogen sulfide (H 2 S) being highly toxic and highly corrosive, even at low concentrations, it is of major importance to forecast H 2 S production. However, until now, there are only very few publications relating reservoir simulations of steam injection processes accounting for thermal and compositional effects in a chemically reactive context.The proposed paper relates a work focused on H 2 S production forecast during a SAGD process from aquathermolysis experimental results and simulation. After a description of the aquathermolysis experiments, the simplified sulfur-based kinetic model deduced from the experimental results is presented. This sulfur-based kinetic model has been used to build a thermo-kinetic component-based model usable in a compositional and thermal reservoir simulation. A simulation of the experimental aquathermolysis reactor being run for validating the thermo-kinetic model, the simulation results of H 2 S production and oil SARA composition versus time are shown to be in good agreement with the experimental results.Then, the thermo-kinetic modeling has been input in a cross-section model designed for simulating a SAGD process. The H 2 S production results were found to be consistent with published field data.The work related in the paper contributes to provide a new insight to the simulation of H 2 S production by aquathermolysis, through the presentation of a simplified modeling of the aquathermolysis reactions, and the description of a methodology for building an EOS (Equation Of State) model compatible with the reactive model.The followed approach is shown to be usable for forecasting H 2 S production due to an aquathermolysis phenomenon during a steam injection process.

show abstract

“…이외에도 Al 2 O 3 , SiO 2 성분 및 활성탄 등을 지지체로 사용하고 반응성을 개선 하기 위해 다양한 금속 산화물을 첨가제로 활용한 탈황 제 제조기술 [88][89][90][91][92][93][94][95][96][97][98] 도 연구되었다. …”

Section: -44)unclassified

Trends in Research and Technical Development of Sorbents for Hot Gas Desulfurization for H₂S Removal

Seo¹,

Baek²,

Kwon³

et al. 2016

Journal of the Korean Institute of Resources Recycling

View full text Add to dashboard Cite

Theoretical reviews of integrated gasification combined cycle one of the clean coal technologies and trends in the study and technology development for high temperature desulfurization sorbents were investigated. Reactivity, durability and abrasion resistance is an important key for development of high temperature desulfurization sorbents, the kind of things include calcium, zinc, manganese, iron and copper-based sorbents. Current status of high temperature desulfurization sorbents, manufacturing techniques of zinc-based sorbent in advanced countries has commercialized. In case of Korea, various research studies are underway to commercialize the Zn and non Zn-based high temperature desulfurization sorbents to cheaper and superior capability using various supports.

show abstract

Dry gas cleaning process by adsorption of H2S into activated cokes in gasification of carbon resources

Cited by 30 publications

References 13 publications

Production of Activated Carbon within the Dual Fluidized Bed Gasification Process

Production of Activated Carbon within the Dual Fluidized Bed Gasification Process

Forecasting of H2S Production due to Aquathermolysis Reactions

Trends in Research and Technical Development of Sorbents for Hot Gas Desulfurization for H₂S Removal

Contact Info

Product

Resources

About

Dry gas cleaning process by adsorption of H2S into activated cokes in gasification of carbon resources

Cited by 30 publications

References 13 publications

Production of Activated Carbon within the Dual Fluidized Bed Gasification Process

Production of Activated Carbon within the Dual Fluidized Bed Gasification Process

Forecasting of H2S Production due to Aquathermolysis Reactions

Trends in Research and Technical Development of Sorbents for Hot Gas Desulfurization for H2S Removal

Contact Info

Product

Resources

About

Trends in Research and Technical Development of Sorbents for Hot Gas Desulfurization for H₂S Removal