单项选择题

The amount of chloride content in the water of an auxiliary boiler can be reduced by（）

A.adding hydrazine
B.blowing down the boiler
C.adding phenolphthalein
D.adding a sulfite chloride scavenger

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单项选择题

The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）

A.increase exhaust gas velocity through the boiler
B.reduce accumulations of carbon deposits on the heat transfer surfaces
C.eliminate exhaust gas pulsations and noise
D.increase the rate of heat transfer to the waterside

单项选择题

The water in an auxiliary boiler should be chemically tested daily for alkalinity and（）

A.soap hardness
B.nitrog encontent
C.chloride content
D.dissolved CO₂

单项选择题

Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?（）

A.Hydrazine treatment of condensate
B.Frequent compounding
C.Chemical cleaning
D.Bottom blowing