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Study on Combustion Characteristics for Raw and Relaxed Gas

Author: LiuQingBin
Tutor: JinYan
School: Taiyuan University of Technology
Course: Thermal Power Engineering
Keywords: Polygeneration Numerical Simulation Combustion temperature Ignition temperature
CLC: TK16
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
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Abstract


Coal-based polygeneration technology integrated solutions facing our country rich in coal, lean, less gas energy status quo as well as low energy efficiency and air pollution, a technical \mass production of coke in the status quo. Polygeneration system in addition to the production of chemical products, output power products for the feed gas is burned to generate electricity chemical synthesis of the remaining crude gas and the purge gas. The remaining crude gas and purge gas composition, physical and chemical properties as well as flow conditions change as the the polygeneration process of operating conditions changes directly affect the stable operation of the gas turbine. Therefore it is necessary to study the combustion characteristics of crude gas and purge gas. In this paper, based on analysis of the gas combustion theory, establish the simulation crude gas and purge gas combustion physics model and gas ignition temperature for the determination of the experimental system, different combustion conditions, the combustion chamber temperature distribution of different combustion model of component changes law of the effect of temperature on gas fire. Experiments using H2, CO, CH4, and C02 gas mixture to simulate the actual multi-generation gas-fired power generation system feed gas preparation by a certain volume ratio. The research results show that the temperature of the adiabatic combustion simulation agree well with theoretical combustion temperature thermal equilibrium calculated remains unchanged after the first rise of the combustion chamber temperature increases with height, the maximum combustion temperature of up to 2047K. Combustor heat input, the thermal boundary conditions, a certain time, with the increase of the methane content of relative volume, the combustion temperature is reduced, and when the methane content must also reduces with the increase in the combustion temperature of hydrogen relative content, the increase of the carbon monoxide content of the combustion temperature increases . Burner air jet velocity unevenness causes uneven distribution of the combustion chamber temperature. With the increase of the wall heat transfer coefficient, the temperature level of the combustion chamber is reduced, the combustion chamber on the radial and axial temperature gradient increases. Combustion temperature presents the trend first and then decreased with increasing excess air ratio, excess air ratio corresponding to the maximum combustion temperature is between 0.9-1.0. The length of the burner is reduced, the jet ignition advance, the combustor radial temperature distribution uniformity deteriorates. Gas ignition temperature decreases with increasing relative hydrogen content increased with the increase of the methane content, the increase of the concentration of carbon monoxide gas ignition temperature has a dual nature. System thermal conditions must, gas ignition temperature is essentially the same, regardless of the primary air rate. Experimentally measured H2, CO and CH4 of the ignition temperature is 563 ° C, 667 ° C and 790 ° C, respectively.

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