Water electrolysis hydrogen works

Water electrolysis hydrogen is a more convenient way. Full of potassium hydroxide into direct current through the electrolytic cell, an electrochemical reaction of water molecules on the electrode, into hydrogen and oxygen. The chemical reaction is as follows:
Cathode: 2H2O + 2e H2 ↑ + 2OH
Anode: 2OH-2e H2O + 1 / 2O2 ↑
Overall reaction: 2H2O 2 H2 ↑ + O2 ↑
According to Coulomb's law, proportional to the current gas production, independent of other factors. Role of potassium is to increase the conductivity of the water itself does not participate in the electrolytic reaction, it is not consumed in theory. Electrolyte vanadium pentoxide was added role is to reduce the electrolysis voltage. Electricity gas production unit of consumption, depending on the electrolysis voltage, the higher the cell operating temperature, the lower the electrolysis voltage, but also increased the cell material, mainly corrosion diaphragm material. Long-term use of asbestos in lye temperature should not exceed 100 ℃, so the operating temperature is selected is appropriate at 80 ~ 85 ℃. Select electrolysis pressure primarily on the basis of hydrogen needed. Hydrogen gas purity depends on the structure and operation of the machine. Under normal operating pressure equipment in good condition, purity is stable.
Process Description
Water means life through water treatment system of pure water, and raw materials into the water tank, the water supply pump input lye system, supplemented by electrolysis of water consumed. Cell water, under the action of a direct current is decomposed into H2 and O2, respectively, along with the electrolyte circulation into the framework of the hydrogen gas-liquid separation, washing, oxygen separator scrubber after cooling. After the separation of pure water mixed with an electrolyte supplement upon, lye cooler, lye circulation pump, filter back to the cell cycle, electrolysis. Lye cooler water flow regulator to control the temperature of reflux lye to control the operating temperature of the cell, to make the system safe operation. After the separation of hydrogen from the control valve output, after purification of hydrogen purification device, into the hydrogen tank, and then the buffer after decompression, for users.
The main design criteria:
1, raw water (electrolysis of water):
Requirements: double distilled water (or deionized water), the resistivity of> 2.0 × 105Ω * cm; chloride ion content of <2mg / l; suspension <lmg / l, according to practical experience, the water feed device capability should be 2-8 hours electrolysis of water yields 24 hours usage.
2, the electrolyte: 26% KOH solution
3, power control cabinet:
     Three-phase four-wire AC
Equipment control system
    1 measuring point: System measuring points set up complete, safe and stable operation of the system affect the volume set upper or lower limit. In addition to the conventional control system measuring point, set the control instrument with air pressure measuring points, automatically operated valve is provided with valve position feedback, the system is running in the water, electricity and gas are qualified, to ensure the operation of valves and instrumentation correct and prompt interlock failure and downtime affecting the safe operation of the system, the security system safe operation.
    2 automatic operation: as long as the system is ready for start, just click the drive button, the system automatically detects the correctness of the parameters to optimal values ​​automatically boost, flow automatically open demineralized water cooling device, automatic analytical instruments put into operation, automatic replenishment, the system fully automatic operation. After passing the hydrogen tank automatic filling, tank pressure reaches the set value is automatically maintained when running Hot Standby (low current operation) or stop, automatically cut off the power supply and rectifier cabinet industrial cooling water, parking, automatic shutdown of the instrument.
3, security
   3.1 redundant design. Monitor specific parameters using separate hardware circuits, related to the safe operation of the loop system with redundant;
   3.2 perfect interlock alarm. Parameters related to the safe operation of the system are set up alarm and interlock functions, to ensure safe operation, the corresponding adjustment of the lower limit, the alarm, the lower limit, the interlock, the lower limit can be adjusted according to the needs of users online. Once the interlock system overrun occurs, the system rectifier cabinet down and secure the system in stages down, if the failure to eliminate the middle, the system will automatically put into normal operation.
Water electrolysis apparatus main components:
Cell
frame
Rectifier transformer
Rectifier cabinet
Control cabinet
Raw water tank
Raw material base box