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离心式压缩机Centrifugal compressor：（）

A、单级压比较低，1.1~1.5，可多级串联或多台串联Single - stage pressure is relatively low, 1.1~1.5, can be multi - stage series or multi - series

B、转速较高，4000r/min,可调High rotation speed, 4000r/min, adjustable

C、排量大Large displacement

D、出口压力不能太高。Export pressure should not be too high

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更多“离心式压缩机Centrifugal compressor：（…”相关的问题

第1题

压缩机与驱动机组合The compressor is combined with the driving unit（）

A、燃气轮机输气机组是由燃气轮机驱动离心式压缩机Gas turbine transmission unit is driven by gas turbine centrifugal compressor

B、电动机输气机组是由电动机驱动离心式压缩机Motor gas transmission unit is driven by the motor centrifugal compressor

C、燃气发动机输气机组是以天然气作燃料的活塞式内燃机驱动。Gas engine transmission unit is driven by piston internal combustion engine fueled by natural gas

D、以上都不对

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第2题

速度型的离心式旋转压缩机Speed type centrifugal rotary compressor：干线输气管道Trunk gas pipeline管径、压力和流量日益增大，离心式压缩机优点突出，在输气干线上已占有绝对优势The pipe diameter, pressure and flow rate are increasing day by day.

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第3题

以下说法正确的有：（）

A、天然气输气干线输送压力一般为4.0~7.5MPa以上。The main gas delivery pressure of natural gas is generally 4.0~ 7.5MPa.

B、输气量大时，选用离心压缩机为宜。When the volume of gas transmission is large, it is advisable to choose centrifugal compressor.

C、一些中小输量的管道，离心式和往复式都可使用。Some medium - sized pipelines, centrifugal and reciprocating can be used.

D、以上都不对

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第4题

离心压缩机centrifugal compressor：（）

A、结构紧凑，尺寸小，重量轻Compact structure, small size and light weight；

B、排气均匀，连续，不需级间的缓冲容器，可以直接进行串联运行Uniform exhaust, continuous, no need for buffer containers between stages, can be directly in series operation；

C、无往复运动部件，振动小，易损件少，不需庞大而笨重的基础No reciprocating moving parts, small vibration, less wearing parts, do not need a large and heavy foundation；

D、除轴承外，机件内部不需要润滑，节省油料，且不会污染所输送的气体In addition to the bearing, the internal parts do not need lubrication, save oil, and will not pollute the transmission of gas；

E、转速高，可与蒸汽轮机或燃气轮机直接联动，便于调节流量，利于节能High speed, can be directly linked with the steam turbine or gas turbine, easy to adjust the flow rate, conducive to energy saving；

F、维修工作量小，调节方便。Small maintenance workload, easy to adjust.

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第5题

离心压缩机的喘振Second, the centrifugal compressor surge：（）

A、现象：压力、流量大幅度变化；吼叫；振动强烈。 Phenomenon: pressure and flow change greatly; Roar; The vibration is strong.

B、危害harm：强烈振动破坏密封部件及轴承、叶轮等运转部件。Strong vibration damages sealing parts and bearing, impeller and other running parts.

C、防止方法prevention method：保证Q1>Qmin，工作点压力低于喘振点压力。Ensure Q1>Qmin, working point pressure is lower than surge point pressure.

D、防止方法prevention method：当Q1<qmin时，回流when reflux occurs：分流出口部分气体经降压冷却后，返回压缩机入口。after cooling down, some gas at the shunt outlet is returned to compressor>

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第6题

离心压缩机的喘振Second, the centrifugal compressor surge原理Principle：（）

A、当Q1＝Qmin，旋转脱离并扩大，出口压力p2减小，<p’ when q1="Qmin," the rotation disengages and expands,exit pressure p2 decreases,> B、倒流Q1<0:下游管道 p2，reverse flow downstream pipe p 'decreases,> C、正流Q1>0:下游管道 p’增大，> p2，Positive flow Q1>0: downstream pipe p 'increases, > p2

D、Q1减小，<0，q1 goes down, is less than>

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第7题

离心压缩机可采用的调节方法The adjustment method that centrifugal compressor can adopt：（）

A、改变压缩机的转速Change the speed of the compressor

B、压缩机出口的节流调节Throttle control of compressor outlet

C、压缩机进口的节流调节Compressor inlet throttling regulation

D、进口气流旋绕调节Air inlet winding regulation

E、旁路回流调节Bypass reflux control

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第8题

离心压缩机的特性曲线I. characteristic curve of centrifugal compressor压力比pressure ratio ε－ Q1特点characteristic：（）