Paravan PR 30, Руководство пользователя

Страница: 147 / 156

Gener
al
Information
Pr
epar
e
Oper
ate
Help
Technology
Systems and technical documentation
147
23. Systems and technical documentation
23.1 How to deal with closed accumulators
Where accumulators are completely enclosed, the oxygen liberated at the positive electrode by water decom-
position is channelled via a glass fibre mat from the positive to the negative electrode and finally converted
back into water at the end of a series of chemical reactions. During charging, a proportion of that oxygen
leaks into the common gas area. With closed accumulators, the housing of the accumulator is designed to
hold in the pressure by stronger walls in order to prevent the short-term excess oxygen from escaping before
being fully recombined at the negative electrode. Where charging is done improperly, hydrogen will be emit-
ted as well as oxygen at the negative electrode.
This hydrogen will not be converted into water but may escape through the safety valve if a threshold excess
pressure is reached, possibly reaching the oxygen contained in the gas space. If you avoid improper char -
ging, no water is lost by enclosed accumulators and the accumulators are entirely maintenance-free. During
storage and energy consumption there is no oxygen in the gas space and the accumulator will be under a
negative pressure. Any valve release should be avoided in all circumstances, since oxidation will occur on
the negative electrode if atmospheric oxygen enters the system. This leads to irreparable damage, up to and
including total failure of the accumulator.