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渣漿泵怎么通過汽蝕調(diào)節(jié)流量
汽蝕調(diào)節(jié)僅用于凝結(jié)水泵中的調(diào)節(jié)，調(diào)節(jié)時(shí)把架的出口調(diào)節(jié)調(diào)全開，當(dāng)汽機(jī)負(fù)荷變化時(shí)，也就是凝汽器的凝汽量相應(yīng)變化時(shí)，供水泵進(jìn)水位的變化來調(diào)節(jié)泵的流量，達(dá)到汽輪機(jī)的排氣量的變化與水泵輸水量自動(dòng)平衡的目的。它的調(diào)節(jié)原理如圖4-11、圖4- 12所示。泵的倒灌高度Hg，為設(shè)計(jì)工況下泵不發(fā)生汽蝕的最小高度，這時(shí)泵的工作點(diǎn)如圖4-12中的A點(diǎn)，當(dāng)汽輪機(jī)負(fù)荷減少時(shí)，排氣量也減少，倒灌高度不能維持Hg，使發(fā)生汽蝕，Q-H性能曲線驟然下降，而裝置揚(yáng)程曲線沒有改變，于是泵的工作點(diǎn)變?yōu)?/span>A1，泵的流量為QA。如果繼續(xù)減小負(fù)荷，繼續(xù)減少排氣量，倒灌高度再往下降，泵的工作點(diǎn)相應(yīng)變?yōu)?/span>A2，A3.....，泵的流量為QA， ....，直至達(dá)到新的平衡。這就是泵汽蝕調(diào)節(jié)原理。
汽蝕調(diào)節(jié)時(shí)應(yīng)注意如下問題:
(1)凝結(jié)水泵的Q-H性能曲線應(yīng)比較平坦一些為好，這樣泵在進(jìn)行汽蝕調(diào)節(jié)時(shí)工作比較穩(wěn)定。
(2)應(yīng)避免汽輪機(jī)長(zhǎng)期在低負(fù)荷下運(yùn)行，而造成泵長(zhǎng)時(shí)間汽蝕下運(yùn)行降低泵的壽命，如果需要長(zhǎng)期在低負(fù)荷下運(yùn)行，應(yīng)開啟凝結(jié)水泵的再循環(huán)，使熱井水位不致過低。
(3)泵經(jīng)常會(huì)在汽蝕下工作，葉輪容易汽蝕破壞，應(yīng)采用抗汽蝕材料的葉輪。渣漿泵廠家
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
