新型喷射式加热器的性能试验

提出了一种新型的多喷嘴结构的喷射式加热器,该加热装置由4个水喷嘴、蒸汽吸入室、4个混合喷管和扩散喷管组成.用试验方法研究了该加热器在低进汽压力下的引射性能和加热性能.试验的工作流体是9℃的水,引射流体是118~124℃的蒸汽,喷射加热器的进水压力在0.1~0.45 MPa范围内.试验结果表明：随着入口水压的升高,引射系数逐渐减小,出口水温降低;在入口水压一定的条件下,喉嘴距较大时引射系数较小;进汽压力越高,出口水温越高,最高加热温升达到85℃;当喉嘴距为38 mm时,其加热效率高达99%;该加热器在低压加热系统中,能够安全稳定运行;在密闭直接混合加热方式中,完全可以消除压力较高的过冷水流入压力较低的抽汽管道的危险.

Experiment on performance of new type ejecting heater

A new type of multi-nozzle ejecting heater is proposed. The heating device consists of four water nozzles,steam inhalation room,four mixed spouts and diffuse spouts. Ejecting and heating performance of the heater at low steam pressure was studied through the experimental method. The working fluid was 9 ℃ water,and the ejecting fluid was 118～124 ℃steam. The inlet water pressure was changed from 0.1 MPa to 0.45 MPa.The results show that ejecting coefficient and the outlet water temperature decreases while the inlet water pressure rises. Ejecting coefficient decreases while the distance between water nozzle and mixed spout increases. The outlet water temperature increases while steam pressure rises. The temperature can rise by 85 ℃. Heating efficiency of the ejector can reach 99% when the distance between water nozzle and mixed spout is 38 mm. The ejector can operate safely and reliably in low pressure heating system. The risk of high pressure water flowing into low pressure extraction pipe can be eliminated in the confined room by directly mixed heating method.