AC/DC conversion unit and polariser for caustic soda plant
1. AC/DC conversion unit and polariser for caustic soda plant
2. Why Choose Green Power?
Rich experience: More than 20 years design, production and service experience for caustic soda
Meet international Standards: products exported to more than 40 countries.
Strong technical ability:PhD technical team, more than 20 years technology accumulation, first class technology. Self developed DSP digital controller.
Reliable quality:Designed, manufactured, tested as per strict reliability standard, ensure reliable running
Considerate service: Professional service before, during and after sales. Lifelong after service system. Customer management system
High performance price ratio:With Europe/USA quality, competitive price than Europe.
Fluent English communication: the team has excellent writing and oral English communication ability.
3. AC/DC conversion unit and polariser for caustic soda plant Block Diagram
AC/DC conversion unit and polariser for caustic soda plant includes high voltage switchgear, rectifier transformers, Rectifier, control panel, heat exchanger, high current DC current measurement sensor, polarization rectifier, DC disconnector, connection copper busbars, computer monitoring unit. Harmonic filter and power factor compensation facility is optional.
4. AC/DC conversion unit and polariser for caustic soda plant typical main circuit configuration
6. Proposal Summary of AC/DC conversion unit and polariser for caustic soda plant
The power source is designed to supply DC current for Caustic Soda production.
The Power supply(Rectifier) system with input voltage 30kV or other input voltage, rated output DC according to customer's requirement, it is 12 pulse, three phase bridge circuit.
The rectifier transformers primary side adopt star connection, secondary has two windings, one adopt star connection, the other adopts adopt delta connection. Vector group is Y,d11y0. Or other vector group.
Transformer is equipped with voltage regulation transformer and on load tap changer 27 taps, regulation range 50%-100%.
Transformer is OFWF cooling.
Transformer tank material where LV and NPT terminals are brought out non-magnetic (SS304)
Thyristor Rectifier adopt 3 phase bridge, 12 pulse. Thyristors are N+1 redudancy design, if one thyristor fails per phase, the unit could continue to give rted output(n-1 thyristor in operation).
Each thyristor is series connected with one fast action fuse, isolate faulty thyristor without damage to the other thyristors, and there is fuse protection.
Thyristor is protected from over voltage surges by connecting RC snubber and Surge Arrestor.
Rectifier is cooled by demineralized(DM) water, cooling system has 100% redundancy for DM water pump, heat exchanger and associated instrumentation and piping. Pipes are stainless steel material.
Separate control panel is provided, computer monitoring unit is provided.
PLC is Siemens S7-300 series
Winding in transformer and bus bar in rectifier is copper material.
7. Main Technical Parameters of Rectifier for Caustic Soda
Green Power Co., Ltd.
No. of cubicles
Semiconductor element to be used
Type of rectifier
Three phase bridge
Number of pulses
Short time overload capacity
150% for 60 seconds once in 24 hrs.
Continuous with n elements in operation
Continuous with “n-1” elements in operation
Type of control
Type and mode of control
Remote control communication with DCS through
RS485 or other communication specified by customer
One thyristor fault per arm alarm, two thyristor fault on same arm trip.
One fuse fault per arm alarm, two fuses fault on same arm trip.
DM water very high temp. Trip
DM water flow low, alarm
DM water flow very low, trip
Mixed cartridge and filter is provided to maintain the conductivity of DM water
Interlocks through DCS
Emergency trip push button station
Earthing fault monitoring
Thyristor RC snubber
Fast action fuses
Input over/under voltage
Output current limit
Bus bar temperature
Rectifier over heat
Output over voltage
Output over current
Cooling water low pressure
Cooling water high temperature
And others required by purchaser
Water cooling system
Pump and heat exchanger N+1 spare
Color touch panel
Control parts are in control panel
The doors is provided with suitable transparent cover
All bolts and nuts in rectifier are stainless steel material.
Aluminum alloy material or powder coating steel carbon or stainless steel material for cabinet
8. Company Introduction Video
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