Dissertation > Excellent graduate degree dissertation topics show

Br-impregnated Calcium-based/mineral Sorbents for Mercury Removal from Flue Gas

Author: LuoJun
Tutor: YaoHong
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Coal combustion Mercury Adsorbent Baptist bromine Modified
CLC: X701
Type: Master's thesis
Year: 2011
Downloads: 36
Quote: 0
Read: Download Dissertation

Abstract


Mercury emissions from coal combustion processes is a major source of atmospheric mercury pollution. Sorbent injection adsorption demercuration method is a simple post-combustion demercuration better activated carbon adsorption method demercuration because of its high cost, without having extensive feasibility, it is necessary for the non-carbon-based adsorbent mercury removal technology to carry out research of the system. In this paper, a laboratory scale fixed bed to dip bromide modified zeolite, kaolin, limestone as the research object, warming pyrolysis experimental study of a series of fixed-bed adsorption experiments and procedures. The fixed-bed adsorption experiments investigated the influence of adsorption temperature, adsorbent containing bromine amount of mercury adsorption removal; mercury at different temperatures under the different adsorbents formed on the surface of adsorption product temperature programmed pyrolysis experiments study, the main research , suggesting that the mechanism of adsorption. The article also utilize circulating fluidized bed pilot bench dip bromine modified calcium-based / mineral adsorbent in the the actual pyrolysis gas mercury removal capacity was investigated. The fixed bed adsorption experiments show that: the adsorption temperature is adsorbent mercury removal capacity of the most important factors. Within the range of 100 ° C -200 ° C, as the temperature increases, the dip bromo zeolite, dip bromo kaolin, have varying degrees of enhanced mercury removal capacity of the dip bromo limestone, 200 ° C, three kinds of leachable a modified calcium bromide group / the mineral adsorbent mercury removal ability to reach the highest level. Dip bromo zeolite has a large specific surface area, the larger the load amount of bromine, containing a certain amount of elements having a catalytic effect, the temperature in each experiment showed excellent mercury removal capacity overall mercury removal capability for the three adsorption agent strongest. Dip bromo kaolin overall mercury removal capacity compared to the lower adsorption temperature dip bromo zeolite should be small, but the adsorption temperature exceeds 150 ° C when the mercury removal capability is ideal. Baptist bromine limestone because of the constraints of characterization, set out the amount of bromine in the adsorption temperature higher than 175 ℃ Hg 0 removal effect ideal mercury removal capacity and shorter time significantly reduced. The adsorption temperature is low, the the adsorbent contained amount of bromine is an important factor affecting the performance of the adsorbent demercuration, but the adsorption temperature is high, set out the increase of the amount of bromine in the limited effect of the enhancement of the mercury removal performance of the adsorbent. Temperature-programmed pyrolysis experiments show that: Baptist bromine-modified calcium-based / mineral adsorbents by chemical adsorption removal of Hg 0 , physical adsorption capacity of Hg 0 weak. The three adsorbents product is roughly the same, in Hg0 in Baptist bromine calcium-based / mineral surface HgBr 2 form fixed. Adsorbent surface Br reactivity differences, cause thermal precipitation property will vary for different adsorption temperature adsorbent surface is fixed mercury removal. The medium circulating fluidized bed test bench investigated dip bromine modified calcium-based / mineral capacity of the adsorbent for the removal of the the actual pyrolysis and gasification of mercury compared with commercial activated carbon, dip bromine zeolite modified kaolin in the actual pyrolysis gas still has excellent mercury removal capability, and better than activated carbon; dip bromine limestone actual pyrolysis and gasification of poor mercury removal effect. Adsorbent pyrolysis gas performance consistent with laboratory results.

Related Dissertations

  1. Modification and Application of the Waste Fluorgypsum and the Treating of High Concentrations Fluoride Wastewater,X703
  2. Establishment of Transgenic Soybean, Maize and Wheat Informationg Platform and Effect of Transgenic Soybean on Soil Microorganisms,S565.1
  3. Exposure to mercury and copper ions under the critical early development of goldfish antioxidant enzymes and dynamic changes,S917.4
  4. Silicone modified acrylic emulsion research,TQ633
  5. The Summary of Redundancy in Chinese,H146
  6. Catalytic Study of Hydrogen Peroxide Synthesis Directly from H2 and O2,TQ123.6
  7. Experimental Study of Mercury Removal with Wet Flue Gas Desulfurization System,X773
  8. Experimental Research of Chemically Modified Silicate for Mercury Removal from Flue Gas,X773
  9. Based on information fusion safety assessment of genetically modified foods,TS201.6
  10. Rapid detection of food chromium, cadmium, copper , mercury photoelectric sensing method of establishing,TS207.51
  11. Metal-halide Lamp Recycling Collection Technology,X705
  12. Different Expression of HSP70 and MT-Ⅱ in the Process of Mercurialentis,R776.1
  13. Zhoushan fishing mainly seafood Analysis and Evaluation of Heavy Metal Pollution,R155.5
  14. Genetically Modified Food Safety Legislation,D922.16
  15. A Study on the Mercury Speciese and Release of Mercury from Sea Water to the Atmosphere in Jiaozhou Bay in Winter,X51
  16. Research on Adsorption of PH3 from Producing Sodium Hypophosphite by Phosphorus Sludge,X78
  17. Red - aqueous systems Cr (Ⅵ) Adsorption Characteristics of,X703
  18. Study on Characteristics of Cu(Ⅱ) Adsorption in Vermiculite-aqueous Solutions,X703
  19. Studies of Transformation and Distribution of Mercury in Soil- B. Chinensis Var. Oleifera System with Acid Rain,X50
  20. Modified Non-carbon Sorbents with MnO2 and Br2 for Mercury Removal from Simulated Flue Gas,X51

CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
© 2012 www.DissertationTopic.Net  Mobile