Study On Release And Elimination Of Chloride In Co-combustion Of Coal And Biomass

With the development of economy, China is at a rapid growth of energy demand. The imbalance between the supply and demand of energy such as coal and oil is more and more serious, which has brought great obstacles to the China’s economic development. There are a lot of difficulties in ensuring the sustainable development of economy through the effective development of new energy, the improvement of utilization rate of energy and establishing new energy system, reducing emissions of pollutants. Although China has abundant biomass reserves, improving the utilization of biomass energy, and reducing problems in combustion is an important content in the present study. When produce electricity by biomass combustion, chlorine in biomass will cause serious dust accumulation, slag and corrosion. Chlorine can promote the release of alkali which is the key of deposition, slag and corrosion. In addition, hydrogen chloride brings acid corrosion. In total, research of release and removal of chlorine has very important significance.In order to grasp the release characteristics of chlorine in combustion biomass mixed with coal and provide a theoretical basis for solving ash deposition, slag, corrosion and other problems, we used Shandong local bituminous coal and biomass research and analyzed the release law of chlorine in co-combustion. With the TG-FTIR test systems for co-combustion, we know how the final temperature, heating rate, the blend ratio and other characteristics effect the release of HC1. We did the research of chloride release including the ratio of hydrogen chloride and doing the kinetic analysis under different condition in co-combustion by the tube combustion system. In order to eliminate hydrogen chloride, we did the research on TG-FTIR experimental system which was about the factor of Calcium Carbide’s function of removing hydrogen chloride.Experimental study found that chloride produced at the combustion temperature of 800℃ with 60% corn stalk mixed coal combustion about approximately 70% of chlorine transform into hydrogen chloride. The greater the proportion of the biomass, the proportion of hydrogen chloride and chloride is generated greater. When the final combustion temperature greater than 700℃, the higher the temperature, the more hydrogen chloride and chloride produced with the temperature increases. Heating rate has a great influence on the release of hydrogen chloride. Within a certain range of heating rate, the faster of heating rate, the more release of chlorine. Miura integration is used in the analysis distribution of activation energy of the hydrogen chloride generated. The activation energy of the reaction is not monotonically deepening with the increasing of ratio. It’s increasing-steady-increasing in 33 kJ/mol ～103 kJ/mol. Experimental study of elimination of hydrogen chloride found that the combustion temperature and heating rate has a great influence on the elimination of hydrogen chloride. Carbide slag contains Silica and Alumina has a great negative impact on the elimination of hydrogen chloride.