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Study on the Use of Calcium Sulfate as Oxygen Carrier in Unmixed Combustion

Author: ZhouShuLi
Tutor: XiaoYunHan
School: Graduate School,Chinese Academy of Sciences
Course: Environmental Engineering
Keywords: Non - combustion Oxygen carrier CaSO4 Response characteristics Inert carrier Active additives Aspen plus
CLC: TK16
Type: Master's thesis
Year: 2007
Downloads: 128
Quote: 9
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Abstract


Burning fossil fuels release large amounts of CO 2 , caused by the \Non-combustion changed the traditional combustion of fuel and air are mixed directly replaced by oxygen carrier between the fuel and air as a medium to transfer oxygen, so as to achieve the purpose of releasing energy in the process at the same time to achieve the right CO. < sub> 2 separation in the product gas can be direct access to the high concentration of CO 2 , CO 2 emissions reduction is of great significance. The feasibility of some problems for non-mixed combustion oxygen carrier CaSO 4 as oxygen carrier and applied to the non-mixed combustion process for CaSO 4 and the response characteristics of the gas fuel, CaSO , reaction improved activity and oxygen carrier cycle characteristics were some preliminary research, carried out for non-mixed combustion used in coke oven gas for hydrogen production some simulation work. For the CaSO 4 used in non-mixed combustion process thermodynamic calculations and simulations are analyzed theoretically CaSO 4 in this process as an oxygen carrier feasibility and CaSO 4 and the gaseous fuel occurs between the reaction temperature and pressure conditions were analyzed. Using a thermogravimetric analyzer and a fixed bed reactor, on CaSO 4 and load an inert carrier, respectively, the coagents the CaSO after 4 and the fuel gas reacts characteristics experimental study. The results showed that, of its occurrence and the fuel gas used singly the CaSO 4 when the starting temperature of the reaction is high, and low reactivity, is not suitable to be applied directly to the non-mixing combustion. By adding an inert material and the coagent to the the CaSO 4 , can reduce the CaSO 4 with the initial reaction temperature of the gaseous fuel. Inert substance with the CaSO 4 Mixed when to play the role of structural support and heat transfer in itself does not participate in the reaction. The active substance is not only involved in the reaction, and at the same time can be more greatly improved of CaSO 4 reactive accelerate the CaSO 4 and the fuel gas reaction speed. At the same time, with the help of X-ray diffraction, specific surface area measurement means, CaSO 4 oxygen carrier gas fuel state before and after reaction were characterized, a preliminary analysis of the CaSO 4 component of the reduction products of the gaseous fuel and cause oxygen carrier reactivity improvement. Constructed based on the non-mixed combustion of coke oven gas from thermal reforming for hydrogen production process, analysis of the process involved in some of the major thermodynamics, chemical equilibrium properties of the hydrogen production. Use the software simulation run, the overall characteristics of the system, and system efficiency indicators were evaluated.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Fuel and combustion
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