| The principle of the separation of the recirculating suspension calciner high solid-gas ratio by the centrifugal separation is selectively made of the coarse grain material outside the furnace. Engineering practice shows that it has good thermal stability, high volume of heat load per unit, high efficiency of decomposition and so on. At the same time, it is obviously effective to reduce the emission of harmful gases. In order to enrich the basic data of the type of the high solid-gas ratio suspension calciner, improve their structure and working characters. In this thesis, we would like to base on the structure of the foundation furnace developed in the Powder Engineering Research Institute. Research between the recirculating suspension calciner for high solid-gas ratio system of the third wind inlet velocity and the cyclone Separator bottom structure parameter with the system pressure drop, external circulation rate, the separation characteristic quantity relationship. Provide the basic parameters for the optimization design of the industrial equipment. We get following conclusions.(1) The external circulation system and unit structure pressure drop gradually increased with the increasing of calciner velocity. The parameters of the structure of the rough separator set have a significantly influenced on the pressure drop of the external circulation system. The collection axis location of the rough separator have a well influence on the pressure drop of the external circulation system more than the change of cone area. Under no-load condition, The OS1 cone structure has a least pressure drop. Under load condition, The DS1 cone structure has a optimal resistance characteristics. When the velocity of calciner is the same, the upward pipe of the calciner pressure drop gradually increased with the increase of the third velocity. While the cross section of calciner has a speed in the range of us=5.0m/s~8.0m/s, the external circulation system pressure drop increase about 3.0%~12.0% while under load condition running(z=0.5) than no-load condition running.(2) The high-efficiency separator total efficiency increased with increasing calainer velocity us, and then gradually decreased with increasing calainer velocity us. At the speed of us=6m/s, the high-efficiency separator has a highest collection efficiency. The changes of the lower cone structure parameters has a great influence on the circulation rate of the external circulation system. The high-efficiency separator total efficiency decreased with increasing velocity us, and then increased. In the seven cone structure parameters, the IS1 cone structure had a highest external cycle rates, In turn accordance with CS3, CS1, CS2, DS1, USI, OS1 cone structure, the external cycle rates is gradually decreased.(3) For the same cone structure of coarse separator, calciner section velocity us=5~6m/s, third wind inlet wind velocity ui=26~28m/s, or calciner section velocity us=7~8m/s, third wind inlet wind velocity ui=24m/s. When the coarse separator in the same third inlet velocity ui, but the calciner section velocity us is different, the change trend of classification efficiency is similar if the particle size dp﹤40μm or dp﹥55μm, Insensitive to the change of the calciner section velocity us. If the particle size was within the range of 40μm﹤dp﹤55μm, the velocity us has notable effect on the classification efficiency, it is had a very obvious volatility. The separation efficiency of coarse particles is more than that of fine particles. Under some operating parameters, the coarse separator could be selectively separated. Go on do the recycling reaction. |
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