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湿法磷酸装置浓缩工艺采用的挤压型石墨管换热器,能承受的蒸汽压力约为0.1 MPa,而生产中所使用的饱和蒸汽的压力一般为0.5 MPa,故需对其进行减压降温处理。提出采用螺杆膨胀发电技术来利用该部分热能及动能。介绍螺杆膨胀机的工作原理、工艺流程及工艺参数,使用螺杆膨胀发电技术后,两套装置年节电效益为430万元,同时节约标准煤2 600余吨,减少CO_2排放量约8 000 t。
Extruded graphite tube heat exchanger used in the concentration process of wet-process phosphoric acid plant can withstand steam pressure of about 0.1 MPa, while the pressure of saturated steam used in production is generally 0.5 MPa, so it needs to be decompressed and cooled deal with. Proposed the use of screw expansion power generation technology to take advantage of the part of the heat and kinetic energy. Introducing the working principle, technological process and process parameters of the screw expander, using the screw expansion power generation technology, the annual power-saving benefit of the two sets of equipment is 4.3 million yuan, saving more than 2 600 tons of standard coal and reducing CO 2 emissions by about 8 000 t .