What are the latest boiler feed water deoxygenation technologies?
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In order to remove oxygen from boiler feed water, thermal deaeration technology is often used, which requires a large amount of steam. Excuse me: What are the latest boiler feed water deoxygenation technologies? How to minimize the steam consumed by thermal deaeration?
At present, in addition to thermal deoxygenation, the boiler feed water deoxygenation process also includes vacuum deoxygenation process and analytical deoxygenation process. The latter two types of deoxygenation are mainly used to treat normal temperature water after the desalted water device. The deoxygenated water is required to be sealed well during storage and transportation to isolate it from the air.
Add "hydrazine (N2H4)" reaction formula to the deaeration tank: N2H4+O2=2H2O+N2, there is no residue after the reaction, and excess hydrazine will automatically decompose without remaining.
If the unit has air separation, it can use nitrogen stripping to remove oxygen. If it does not, it can use combustion-produced inert gas stripping to remove oxygen. The operation is economical and reliable.
Using the chemical deaeration method, prepare the hydrazine solution in the deaeration solution storage tank and pump it into the deaerator with a metering pump. The chemical reaction is as follows: N2H4+ O2=== 2H2O+ N2
There are two methods to remove oxygen from boiler feed water:: A principle of thermal deaeration: Gas Lifting Principle 2 Chemical Deoxygenation N2H4＋O2=2H2O+N2
There is also the need to study system corrosion. At least in foreign literature, the residual oxygen content index after deaeration has been relaxed.