Hydrogen Generation Plant

The Balance Of Plant by Brise Chemicals is based on bipolar pressurized water generation based system. The Electrolyser can be operated at a pressure 10 – 32 barg. Each electrolyser is designed for extra capacity of desired final hydrogen flow. The Main equipment of balance of plant, in which, water is dissociated into hydrogen and oxygen through electrolysis, where H2 is generated at cathode and O2 is generated at anode.

Process Flow Diagram

• Electrolyser is filled with 30% NaOH aqueous DM Water solution.
• A Rectifier and Transformer are used to change high AC Voltage to become DC power.
• The positive power of DC is connected to the anode of electrolyser, cathode of electrolyser is connected to negative power.
• The electrolyte is being circulated from hydrogen and oxygen separators to the electrolyser as per design conditions.
• The pressure in the system is raised with collected gas and is maintained at a set pressure by regulating the valve.
• The electrolyte at the bottom of hydrogen and oxygen separators is pumped back to electrolyser after filtering and cooling, to complete the process cycle.
• While the product gases H2 and O2 are stored or goes to the post-generation stages.
• With 99.999 % purity can be used for most applications.

Safety Feature Of Hydrogen Plant

• As Hydrogen is critical to handle, in order to meet the high safety requirements, we design our system with utmost care and have incorporated pressure, temperature and Level Transmitters controlled by PLC.
• Pressure control :In normal operation, the control system monitors the pressure value, and compares it with the set values, once the measured value crosses the set value, there will be an alarm signal enabling the operator to tackle the problem
• Temperature control :The temperature control is also monitored by PLC, when the temperature overpasses the set value, it will alarm, when the temperature is higher than required, the control system will interlock the rectifier and open the regulation valve of cooling water to maximum position to reduce the temperature rapidly.
• Level control :The control system compares the measured values of hydrogen and oxygen level with their set values, once the values are beyond of the set ranges, the control system will alert the operator.
• All equipments such as PLC, Rectifier, Power Panel, Motors, Pumps, Instruments etc. are adequately designed for reliable and safe operation

Balance Of Plant and stack

Pre H2 Generation Stages

• Transformer/Rectifier Unit converts the AC Voltages supply into DC current input at required voltage.
• Electrolyser Stack Electrolyser is a filter Press type Bipolar electrode separated by an environmental friendly diaphragm.
• Electrolyte System The package consists of two Gas Separator and Electrolyte Recirculation system. The recovered electrolyte from separator is cooled and recycled into the stack.
• H2/O2 Washer The main function is:
  – Feed water tank
  – Cools down H2
  – Remove residual electrolyte traces

Post H2 Generation Stage

• Buffer Tank Buffer Tank is the storage tank installed between electrolyser and the compressor for the h2 compression ultimately helps in H2 transportation.
• H2 Compressor The critical phase in H2 generation is transportation. For that H2 needs to be compressed and stored under pressure.
• Deoxidizer If higher purity of H2 is required, the last molecule of oxygen can be removed by catalytic reaction in a deoxidizer.
• Dryer Dryer helps the gas to reach its suitable dew point with the help of desiccant-filled tower water is absorbed.
• H2 Storage The optional H2 storage provides a backup for batch applications with uneven gas consumption.

Working Principle Of Deoxidizer & H2 Dryer

“During starting H2 stream gets passed via. Bed coils of initial generating bed and then enters in to Deoxidizer bed. Post Deoxidizer bed, it goes in to the condenser, moisture trap to remove moisture from saturated H2 Stream and then enter in to the Dehydration catalysts bed, after dehydration 85% dry H2 stream goes in towards product side and remaining 15% will be utilized in closed loop as regeneration H2 flow which is getting mixed with inlet H2 stream.

Post Generating bed saturation, Bed goes in to the regeneration during which initially bed gets de-pressurized via. Blow down followed by Hot 15% Dry H2 stream and as mentioned above, stream gets mixed inlet H2 stream of another generating bed. After Depressurization bed get cooled with the help of cooling water stream to the room temperature. Once Bed Dry and cooled, it gets pressure equalized from the generating bed H2 stream and become ready for its new generating cycle and thereby cycle repeats for every generation and regeneration.”

Product Offering : Separation Unit

Product Offering : Purification Unit