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根据蓄热器充热过程的原理、工况及喷嘴选型关系式,得出常见的中低压蒸汽蓄热器应用系统中,蓄热器的喷嘴出口最低压力低于或接近临界压力,蓄热器充热喷嘴应根据蓄热器充汽和放汽压力采用缩放喷嘴或渐缩喷嘴.采用缩放喷嘴时,喷嘴渐扩部分长度L的选择根据喷嘴出口直径及顶锥角φ进行选取,φ在10～12°之间取值效果最佳。同时以某钢厂转炉余热锅炉系统的蓄热器应用实例,计算了实际应用中,充热喷嘴应采取的型式及充热压力P1为3.3 MPa和放热压力P4为1.4 MPa时的蓄热器最低充汽压力下喷嘴的临界流速及出口流速。
According to the principle of heat accumulator charging process and the relational formula of nozzle selection, it is concluded that the lowest pressure at the nozzle outlet of regenerator is lower than or close to the critical pressure in the common application system of medium and low pressure steam heat accumulator, The nozzle should be based on the heat accumulator charge and release steam pressure scaling nozzle or tapered nozzle.With the scaling nozzle, the divergence of the nozzle length L of the choice of nozzle outlet diameter and cone angle φ according to choose, φ The best value between 10 ~ 12 °. In the meantime, the practical application of the regenerative nozzle in the waste heat boiler system of a steel mill is to calculate the type of the nozzle to be used and the regenerator when the heating pressure P1 is 3.3 MPa and the exothermic pressure P4 is 1.4 MPa The minimum flow rate of the nozzle and the outlet flow rate under the lowest filling pressure.