Preparation and Performance Study on Lignite Briquette Coke
In order to promote the energy utilization efficiency and reduce the environmental pollution in the process of lignite direct utilization, lignite briquette and its coke were prepared. The effects of pyrolysis temperature and holding time on the briquette coke were investigated through the pyrolysis experiments of lignite briquette. The results showed that the changes of yield, volatile, ash, fixed carbon, elemental composition and oxygen functional groups content of briquette coke were dependent on increasing pyrolysis temperature and holding time. The mechanical properties of the briquette coke were assessed by means of their cold strength, compressive strength, thermal strength, immersion strength, falling strength, and so on. The fine quality briquette coke prepared from lignite briquette with high strength, heat stability more than 96%, low calorific value on dry basis higher than 6600Cal/g, and its volatile content could reach no more than 3%.
Study on Lignite Carbonization
The article analyses heat stability of a lignite in Yunnan;Lignite is carbonized with the heat up rate of 20 ℃/min,we find that as temperature rises and heat preservation is prolonged,the volatile matter decreases,the ash content increases,the fixed carbon content increases firstly and then decreases,the content of CO and H2 increases,the content of CO2 decreases,and the content of C2+ and CH4 increases firstly and then decreases.The alteration mechanism are explained from the viewpoint of coal chemistry;Because the coke has large amount of Al2O3(21.37%),and Al2O3 forms low melting point compounds with other metal elements,so the melting point of coke is only 1200℃;By washing the coke with heavy medium separation method,the ash content could be reduced remarkably,high grade metallurgy coke of the fixed carbon bigger than 83% could be obtained;Finally the theoretical basis for use of pyrolysis gas efficiently is proposed.
An introduction to dramatherapy
What Is Dramatherapy? Theory into Practice Preparing for Dramatherapy Beginning a Dramatherapy Session Applying Dramatherapy The Heart of Dramatherapy Dramatherapy and 'Mental Illness' Dramatherapy and Other Forms of Disorder of Mind Other Client Groups and Dramatherapy