Dissertation > Excellent graduate degree dissertation topics show

The Simulation Study of Coke Oven Gas Using Chenmical Looping Combustion

Author: LiGuangLong
Tutor: GuoQingJie
School: Qingdao University of Science and Technology
Course: Chemical Engineering
Keywords: chenmical looping combustion oxygen carrier carbon dioxide coke oven gas
CLC: TQ541
Type: Master's thesis
Year: 2013
Downloads: 15
Quote: 0
Read: Download Dissertation

Abstract


The greenhouse effect is a common concern topic in the world, and the carbon dioxide emission reduction technology also become research emphasis. Chemical-looping combustion (CLC) technology is a potential clean combustion technology, which has the inherited characteristics of carbon dioxide separation. Without extra energy consuming and additional carbon dioxide separation device, it can achieve high purity carbon dioxide capture. Both the oxygen from the air to the fuel and the heat from the air reactor to the fuel reactor are transferred by the oxygen carrier, and the CLC consists of two step chemical reaction to realize graded use of energy. The energy utilization efficiency is raised and the formation of NOx gases is efficiently inhibited. In this thesis, simulated investigation of chemical looping combustion is presented with coke oven gas and CaSO4oxygen carrier.Based on the minimization of the total Gibbs free energy for all species, Chemical Looping Combustion mechanism of coke oven gas for calcium-based composite oxygen carrier was explored. The effects of composite oxygen carrier ratio, and FR temperature on the gas equilibrium composition, the distribution of the solid products, and on the conversion rate of the main reactant on CLC process were systematically examined. The main conclusions are as follows.Over a reasonable temperature range (400℃-1000℃), the main reaction are the reduction reaction between CaSO4and CO, H2, CH4. The main product are CaS, H2O and CO2. Also, the methanation reactions and thermochemical sulfate reduction reaction occurrence below this temperature range, and the main products are CaCO3and H2S. Above this temperature range, the solid-solid reaction between CaSO4and CaS generates a large number of SO2. CLC reactions of coke oven gas occur completely at the temperature of1000℃and a pressure of1atm.In the temperature range of600℃～1000℃, the Ca-Ni composite oxygen carrier can reach almost zero SO2production and96%production of H2O and CO2, higher than the Ca-Fe composite oxygen carrier. The CaSO4conversion rate of different proportions of Ca-Fe and Ca-Fe composite oxygen carrier is little affected by temperature, and CaS has the highest amount of the solid product, without CaCO3formation. The appropriate amount of NiO and Fe2O3can improve CaS yield. At the temperature higher than1000℃, the Ca-Ni composite oxygen carrier can approach3.13%SO2yield (Ca6Ni4i4,1200℃), but the Ca-Fe composite oxygen carrier can reach0.35%SO2yield (Ca6Fe4,1200℃), which has little change with increasing temperature. The products yield of H2O and CO2are reduced with increasing temperature. There is a small amount of CaO generated in solid product, less than single oxygen carriers. But the Ca-Mi composite oxygen carrier generated more CaO than the Ca-Fe composite oxygen carrier. The Ca-Ni composite oxygen carrier has100%conversion rate to CH4, C2H6and CaSO4in the temperature range studied. The addition of Ni component enhances the conversion rate of H2.

Related Dissertations

  1. Methane and Carbon Dioxide Fluxes from Spartina Alterniflora Marsh in Minjiang River Estuary,X502
  2. Experimental Study and Analyses of O2 -CO2 Production Based on Chemical Looping Method,O611.3
  3. A Study of Tax Rate Design of Carbon Dioxide Tax in China,F812.42
  4. Measuring Instrument of Carbon Dioxide Based on Infrared Sensor,TP212
  5. Study on Synthesis of Dimethyl Carbonate in Supercritical Carbon Dioxide,O623.662
  6. Functional Br (?) Nsted acidic ionic liquid catalytic synthesis of cyclic carbonate reactivity,O643.32
  7. Preparation of Poly (Ionic Liquid)and Its Application in Polystyrene Supercritical Dioxide Carbon Foaming,TQ325.2
  8. Preparation of PMMA-b-PDMAEMA Composite Membranes by RAFT Polymerization for CO2 Separation,TQ028.8
  9. Carbon Dioxide Reforming of Methane to Produce Syngas by Thermal Plasma,TE665.3
  10. Research of Pernicious Gases Measurement Technique Based on Algorithm of Integrating Sphere,TP274
  11. Research on the Sources of Change on CO2 Emission in Zhejiang,F205;F127
  12. Studies on the Heterogeneous Catalysts for the Cycloaddtion of Carbon Dioxide and Epoxides,O643.32
  13. Synthesis of Poly(Vinylacetate) Based Co 2 -philic Hydrocarbon Polymers by RAFT Polymerization and Their Applications,TQ323.42
  14. Experimental Study on CO2 Sorption Properties by Li2O-Containing Solid Sorbents at High Temperature,X51
  15. Experimental and Theoretical Study of Carbon Dioxide Solubility in Liquefied Natural Gas,TE64
  16. Magnetic field characteristics of the arc short circuit transfer,TG444
  17. Methane、Carbon Dioxide & Ammonia Concentration Changes and Influence Factors in Cow Barn Air in Cold Season,S823
  18. Metabolic Regulation of Astaxanthin Biosynthesized in Phaffia Rhodozyma,TQ929
  19. Applied Research of Configuration Software in the Coke Oven of the Production,TQ522.1
  20. Research on the Foaming Process and Properties of Polypropylene with Supercritical CO2,TQ328.06
  21. Detect and Analysis of Flame Emissivity of Burning Mixture of Pulverized Coal and Gas Fuel Based on Image Processing,TK227

CLC: > Industrial Technology > Chemical Industry > Coal gasification industry > Gasification theory ( combustible gas,gas )
© 2012 www.DissertationTopic.Net  Mobile