Pressure Compensation System Having a Safety Function for an Electrolytic Tank
The invention relates to a pressure compensation system having a safety function for an electrolytic tank of flow batteries, in particular, vanadium redox flow batteries, and a head portion ( 5 ) of the electrolytic tank ( 3, 4 ) is connected to the surrounding area ( 2 ) of the flow battery via a pipeline ( 6 ), in which a primary bi-directional pressure compensation valve ( 7 ) is situated, and a bypass line ( 9, 20 ), in which a secondary bi-directional pressure compensation valve ( 10 ) having a second response pressure greater than the first response pressure is situated, branches off from the pipeline ( 6 ) having the primary pressure compensation valve ( 7 ) having a first response pressure, and the outlet ( 11 ) of said bypass line is situated within a housing ( 13 ) surrounding the electrolytic tanks ( 3, 4 ).
1 . A pressure compensation system having a safety function for an electrolytic tank of redox flow batteries, wherein a head portion of an electrolytic tank is connected with the surrounding area of the flow battery via a pipeline in which a primary bi-directional pressure compensation valve having a first response pressure is situated, wherein a bypass line, in which a secondary bi-directional pressure compensation valve having a second response pressure, which is greater than the first response pressure, is situated, branches off from the pipeline and a valve outlet of the secondary bi-directional pressure compensation valve is located within a housing surrounding the electrolytic tank.
2 . The pressure compensation system according to claim 1 , wherein a flashback valve situated at a main outlet.
3 . The pressure compensation system according to claim 1 , wherein a sensor is located in the area of the valve outlet of the secondary bi-directional pressure compensation valve for detecting escaping gas.
4 . The pressure compensation system according to claim 1 , wherein the secondary bi-directional pressure compensation valve is formed by a U-shaped bypass line filled with a certain amount of seal liquid and the seal liquid is disposed in the pressure balanced state in the sink of the U-shaped bypass line.
5 . The pressure compensation system according to claim 1 , wherein the primary bi-directional pressure compensation valve is formed by a U-shaped pipe section of the pipeline which connects the head portion of the electrolytic tanks with the surrounding area of a tank area and a seal liquid is situated in the pressure balanced state in the sink of the U-shaped pipe section.
6 . The pressure compensation system according to claim 1 , wherein the seal liquid is provided with a liquid having a reduced evaporation rate.
7 . The pressure compensation system according to claim 1 , wherein an anti-static liquid is used as seal liquid or that an anti-static additive is added to the seal liquid.
8 . The pressure compensation system according to claim 1 , wherein an acoustic sensor is disposed at the U-shaped bypass line.
9 . The pressure compensation system according to claim 1 wherein the U-shaped pipe section and/or the U-shaped bypass line is/are designed in a transparent or translucent manner.
10 . The pressure compensation system according to claim 1 , wherein an optical sensor is disposed at the U-shaped bypass line and the U-shaped bypass line is designed in a transparent or translucent manner.
11 . The pressure compensation system according to claim 1 , wherein a flushing valve is provided between inlet side and outlet side of the primary pressure compensation valve.
12 . The pressure compensation system according to claim 1 , wherein the U-shaped pipe section and the bypass line are made out of chemically resistant material vis-à-vis the electrolytic fluid in the electrolytic tank.
13 . The pressure compensation system according to claim 1 , wherein a device for grounding is provided which is in electrical contact with the seal liquid.