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某石化公司改性沥青装置中,反应釜外形尺寸为准7408mm×2600mm×8mm,需要加热的面积约为20m2。反应釜内加热盘管,管径为准76mm×4mm的流体无缝钢管,管内介质为270℃高温导热油,反应釜外为保温层。混合液温度从190℃加热到240～245℃,通过顶置搅拌器进行搅拌,使其充分混合,增强反应的效果。由于反应釜内加热盘管与内壁有很大的空隙,且盘管之间约有50mm的间隙;另外,升温过程中由于混合液中的SBS改性剂与270℃高温导热油盘管壁直接接触,导致含有SBS改性剂的沥青混合液在釜内加热盘管外壁和加热盘管间隙内结焦,罐内介质升温速度变慢。选择外加热盘管+导热胶泥的加热方式对现有加热方式进行改造。JM-600型导热胶泥以石墨为基料,具有极高的传热效率、优异的传热稳定性和受热均匀性。外加热盘管+导热胶泥,是将加热盘管与反应釜的接触方式由线接触改变为面接触。改造后应用效果表明,外加热盘管+导热胶泥相结合的方式,施工简单,热效率高,解决了反应釜内介质结焦和升温慢的问题。此方法也可推广到其他受温度影响较大的易凝、易结晶的管道介质输送上。
In a petrochemical company modified bitumen unit, the external dimensions of the reactor are 7408mm × 2600mm × 8mm, and the area to be heated is about 20m2. Reactor heating coil, the diameter of 76mm × 4mm fluid seamless steel pipe, pipe medium is 270 ℃ high temperature heat conducting oil, outside the reactor for the insulation. The temperature of the mixture is heated from 190 ° C. to 240-245 ° C., stirred by an overhead stirrer, and thoroughly mixed to enhance the reaction effect. As the reactor heating coil and the inner wall has a large gap, and between the coil about 50mm gap; In addition, the heating process due to the mixture of SBS modifier and 270 ℃ high temperature thermal oil coil wall directly Contact, resulting in the asphalt mixture containing SBS modifier heating coil in the outer wall of the heating coil coke and the gap, the media tank temperature slows down. Select the heating coil outside the heating coil + thermal conductivity of the existing heating methods to transform. JM-600 thermal clay to graphite as the base material, with high heat transfer efficiency, excellent heat transfer stability and thermal uniformity. External heating coil + thermal paste, is the heating coil and the reactor contact by the line of contact change to surface contact. After transformation, the application results show that the combination of the external heating coil and the thermal conductive clay has the advantages of simple construction and high thermal efficiency, and solves the problem of medium coking and slow heating in the reaction kettle. This method can also be extended to other temperature-influenced larger condensate, easy to crystallize the pipeline media transport.