| 摘要 |
<p>A process and system utilizing a fixed bed lignite dryer for dry distillation of lignite. Lignite is loaded into a fixed bed lignite dryer; a low-temperature working medium of a temperature between 105 °C and 260 °C is introduced into a recuperator of the fixed bed lignite dryer; the lignite is dried to a subsequent process requirement; the medium is either replaced or heated; a high-temperature working medium of a temperature between 400 °C and 1000 °C is introduced into the recuperator of the fixed bed lignite dryer; the lignite is carbonized to a process requirement; and then, the hot lignite is unloaded. Also, a system composing the process utilizing the fixed bed lignite dryer for dry distillation of lignite. In the present invention, the fixed bed lignite dryer is without any moving part, drying and dry distillation processes are completed on one bed, operation is greatly simplified, a special requirement for dry distillation of lignite is satisfied, the quality of a dry distillation product of lignite is increased, also, total moisture content of lignite is greatly reduced after deep drying, clean and highly efficient separation of a dry distillation gas is facilitated, tar collection rate is increased, and the economy of dry distillation of lignite is increased.</p> |
