煤制天然氣合成氣中CO_2分離方法與特性研究
[Abstract]:In the current (SNG) process of natural gas from coal to natural gas, the low temperature methanol washing process is generally used to remove CO2 gas. However, the low temperature methanol washing process is often affected by the S content in the acid gas and the cooling capacity of the unit, which results in the decrease of the removal effect. Therefore, it is necessary to study the characteristics of existing CO2 gas removal methods in order to provide a theoretical basis and data support for finding a more safe and effective method to remove acid gas from methanol washing at low temperature. In this paper, the CO2 membrane separation method and MEA chemical absorption method are studied by using the membrane separation experiment system under the laboratory scale, and the theoretical analysis method is put forward. In this paper, a new method of membrane separation-chemical absorption combined removal of CO2 has been proposed and verified on the membrane separation-MEA chemical absorption test bench. The results are as follows: the membrane separation coefficient is an important parameter to measure the gas separation performance of polymer membrane. The larger the volumetric flow rate of inlet air, the higher the pressure and the lower the temperature, the larger the membrane separation coefficient is. The higher the gas CO2 concentration at the permeation end of the membrane is, the higher the separation coefficient of the membrane is higher than that of the Prism membrane, but the separation performance of the latter is more stable when the inlet condition changes. The concentration of CO2 at the osmotic end of the membrane is 63.4, the separation efficiency is 63.27g / min, and the recovery rate of CH4 is 93.55. The higher the flow rate and temperature of 95.5%.MEA is, the higher the concentration of CO2 is, and the higher the concentration of CO2 is, the higher the solution viscosity is. After absorption of the mixed gas with the concentration of 60L / min CO _ 2 is 15%, the separation efficiency can reach more than 99%, and the highest desorption rate can be obtained when the concentration of the recovered CH4 is more than 99% and the rich solution of MEA has contact with the vapor of 6m3/h, which is 72.52%. According to the amphoteric ion mechanism, the chemical absorption and desorption process of MEA can be accurately described. The kinetic model derived from the mechanism can be used to calculate the absorption rate in the chemical absorption process of MEA and the desorption rate at any time during the desorption process. The combined separation of CO2 is influenced by inlet pressure, volume flow rate, temperature, concentration of MEA, flow rate, temperature and so on. To achieve the ideal separation effect, the molar ratio of MEA to CO2 must be adjusted to be above 1.15. The separation efficiency was 81 and the recovered CH4 concentration was 95. 5%. The combined method is beneficial to reduce the amount of MEA needed for chemical absorption, so it can be used as a substitute for methanol washing at low temperature.
【學(xué)位授予單位】:上海交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TE665.3
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