Integrated Design Of Low Rank Coal Clean Conversion Carbon Cycle Process And The Applicable Research Of Carbon Capture Technology With Self-heating Regeneration Theory

In our country,coal resources are relatively abundant,especially including the low-rank coal.However,its high water content and low calorific value limits the direct utilization efficiency in the traditional way that leads to a vast organic resources waste.In addition,the pollutants,like CO2,coming from the coal utilization process damage the natural environment endlessly and cause global warming with a proportion of 50-60%.As a method which can utilize low-rank coal resources reasonably,the classific and quality conversion of coal and poly generation technology have attracted many attentions.The classific and quality conversion of coal can not only utilize low-rank coal resources efficiently and cleanly,but also directional transfer and enrichment the control pollutant easily.According to the previous work,this paper proposed a new technology which based on a carbon cycle low-rank coal clean conversion and poly generation system.This new technology utilizes the three-tower circulating fluidized bed with a characteristic of self-consistent coupling resources and energy structure,which take carbon cycle and high-value-added product as the concept and the direction respectively.In the integrated production process,considering the gas produced in pyrolysis as the pyrolysis carrier gas of the coal in downer can not only increase the yield of pyrolysis tar,but also avoid the reduction of thermal efficiency when N2 was carrier gas.Using CO2 from combustion as the power generation working medium of the power turbine gas turbine can avoid the damage of the nitrogen oxides from high temperature(power generation working medium N2)to the equipment.The gas phase composition of high concentration CO2 generated after gas works,can decrease the carbon capture energy consumption.During the integrated process of chemical and power unit,the idea that traditional production system unilateral pursue productivity and recycling efficiency was broken.And in the chemical synthetic unit,synthetic gas used the one-step taking and moderately circulating to synthesize some chemicals.At the same time,those unconverted synthetic gas and component which was not suitable to synthesize by chemical method acted as fuel gases transported to gas turbine.Process modeling with process simulation tool Aspen Plus was used to analyze the balance between quality and energy,also contrast the energy utilization efficiency before and after conversion of working medium.The high value conversion of carboncontaining resources aims to seek coordination and unification of three aspects of energy,chemical industry and environment,which provide a new thinking for the development of clean coal conversion technology represented by coal-based poly generation.Secondly,this article introduced an advanced energy usage method-self-heating regeneration theory,then applied it to optimize the energy conservation of carbon capture unit basing on chemical absorption.Through this designing process,optimized carbon capture technology achieves recycle the heat of reaction and latent heat of condensation at the top of the tower,also accomplishes the energy matching among mechanical,chemical and thermal process.The waste heat of flue gases and the energy of lean liquid after heat exchange will get reasonable utilization.Similarly,the need for additional heat sources will reduce in this system.Through Aspen Plus modeling and economic evaluation of comprehensive investment and operating costs,the development of self-heating regeneration theory applied in CO2 capture has been broadened.