渣浆泵怎么通过汽蚀调节流量

汽蚀调节仅用于凝结水泵中的调节，调节时把架的出口调节调全开，当汽机负荷变化时，也就是凝汽器的凝汽量相应变化时，供水泵进水位的变化来调节泵的流量，达到汽轮机的排气量的变化与水泵输水量自动平衡的目的。它的调节原理如图4-11、图4- 12所示。泵的倒灌高度Hg，为设计工况下泵不发生汽蚀的最小高度，这时泵的工作点如图4-12中的A点，当汽轮机负荷减少时，排气量也减少，倒灌高度不能维持Hg，使发生汽蚀，Q-H性能曲线骤然下降，而装置扬程曲线没有改变，于是泵的工作点变为A1，泵的流量为QA。如果继续减小负荷，继续减少排气量，倒灌高度再往下降，泵的工作点相应变为A2，A3.....，泵的流量为QA，  ....，直至达到新的平衡。这就是泵汽蚀调节原理。
汽蚀调节时应注意如下问题:

(1)凝结水泵的Q-H性能曲线应比较平坦一些为好，这样泵在进行汽蚀调节时工作比较稳定。  

(2)应避免汽轮机长期在低负荷下运行，而造成泵长时间汽蚀下运行降低泵的寿命，如果需要长期在低负荷下运行，应开启凝结水泵的再循环，使热井水位不致过低。

(3)泵经常会在汽蚀下工作，叶轮容易汽蚀破坏，应采用抗汽蚀材料的叶轮。渣浆泵厂家

How to regulate the flow of slurry pump through cavitation

The cavitation regulation is only used for the regulation in the condensate pump. During the regulation, the outlet regulation of the rack is fully opened. When the load of the turbine changes, that is to say, when the condensate of the condenser changes correspondingly, the change of the inlet water level of the water supply pump regulates the flow of the pump, so as to achieve the purpose of automatic balance between the change of the exhaust volume of the turbine and the water delivery volume of the pump. Its adjustment principle is shown in Fig. 4-11 and Fig. 4-12. The pouring height Hg of the pump is the minimum height of the pump without cavitation under the design working condition. At this time, the working point of the pump is as shown in point a in Figure 4-12. When the load of the turbine is reduced, the exhaust volume is also reduced, and the pouring height cannot maintain Hg, resulting in cavitation. The Q-H performance curve suddenly drops, but the installation head curve does not change, so the working point of the pump becomes A1, and the flow of the pump is QA. If the load continues to be reduced, the exhaust volume continues to be reduced, and the pouring height goes down again, the working point of the pump correspondingly becomes A2, A3,..., and the flow of the pump is QA,..., until the new balance is reached. This is the principle of pump cavitation regulation.

Attention shall be paid to the following problems during cavitation regulation:

(1) the Q-H performance curve of condensate pump should be relatively flat, which is better, so that the pump works stably during cavitation regulation.

(2) long term operation of steam turbine under low load shall be avoided, which will lead to long-term operation of pump under cavitation and reduce the service life of pump. If long-term operation under low load is required, recycle of condensate pump shall be started, so that the water level of hot well will not be too low.

(3) the pump often works under cavitation, and the impeller is easy to be damaged by cavitation. The impeller made of anti cavitation material shall be used. Slurry pump