热工（Thermal）.docVIP

热工（Thermal） Review data of thermal equipment The second chapter, new dry process cement rotary kiln system 1, the new dry process cement rotary kiln system takes the suspension preheating and the outer kiln decomposition as the technical core. 2. The main purpose of calciner is to increase production. 3, according to the motion form of the main flow of decomposing furnace is divided into four basic forms: cyclone, spouting type, suspension and fluidized bed. 4, NSP advantages: 1, structure: between suspension preheater and rotary kiln with a decomposing furnace, decomposing furnace efficiently undertakes the task decomposition was mainly used in the rotary kiln of calcium carbonate, which can shorten the rotary kiln, thereby reducing kiln area, reduce the movable equipment number and decrease the cost of rotary kiln. 2, thermal process: second heat decomposition kiln precalciner kiln, the traditional burning practices all joined kiln head into small part of kiln head, most of the fuel adding calciner, this can effectively improve the thermal distribution of the whole kiln, effectively reduce the heat load of refractory material in the kiln, reduce the nitrogen oxide under high temperatures. It is beneficial to protect the environment. 3, the process will be in the process of heat consumption: the largest part of the transfer to the decomposition furnace clinker, as fuel and raw materials highly dispersed, so the fuel combustion heat quickly transferred to raw material, therefore, combustion, heat transfer and decomposition of calcium carbonate are to optimize the sintering process of cement more perfect, yield, rotary kiln clinker, the yield of single unit capacity have been improved, the heat consumption also decreased. Disadvantages: the kiln has a large resistance to fluid flow, high power consumption, large investment in infrastructure and a certain limit on raw material fuel. 1.5, why is the heat transfer efficiency between gas and solid in the suspension prehe