• Language:
  • NO
    Selected
  • GB
    Selected
  • GER
    Selected
  • BRA
    Selected
  • PL
    Selected
  • RU
    Selected
  • NO
  • GB
  • GER
  • BRA
  • PL
  • PL
en
In every corner of the world, there are Parat Halvorsen steam and heat systems in use every day. Quality and reliability have brought us where we are today.
  • NO
  • GB
  • GER
  • BRA
  • PL
 

PARAT IEH

High Voltage Electrode boiler for Steam and Hot water

  • From cold to full load in less than 5 minutes
  • 30 seconds from minimum to full load
  • Minimum load 0%
  • No earth current
  • Compact design – up to 60MW in one unit
  • No separate transformer required
  • No Electrode wear
  • Minimum maintenance required



From renewable POWER to HEAT 
with PARAT electrode boiler



PARAT; boilers since 1920
Our electrode boiler has been designed and developed by our in-house engineers and manufactured in our workshop in Norway since 1990. The PARAT Electrode boilers are very reliable and has been used as the main boiler in many of our deliveries. Thanks to our long experience, we where chosen to deliver the first steam boilers for Grid Regulation in the World.

Steam and hot water
The electrode boiler is delivered both in steam and hot water versions. Renewable energy can be used in steam grids and district heating networks. The electrode boiler is also a valuable backup boiler.
 



Grid Regulation


The growing production of renewable power from sun and wind gives more and more often excess power in the grid. This power must be used, to stabilize the frequency of the current at 50 Hz. This is called grid frequency regulation.


Grid Regulation


Electrical grid regulation
Increasing power generation from wind and solar systems have created a demand for fast frequency regulation of the electrical power grids. The PARAT Electrode boiler can be used for primary regulation with less than 30 seconds response time from minimum to full load. Converting electrical power to heat makes it possible to accumulate renewable energy in periods of overproduction. This way the renewables can run and the clean power used will replace fossil fuel. 

The PARAT Electrode boiler gives the most compact and cost efficient transformation of power to heat.

Backup boiler
Since electrical power will be available as a cost competitive fuel in the future, the PARAT Electrode boiler will also be a valuable backup boiler in case of breakdown in the fired boilers or in the fuel distribution system. No other boiler alternative can be ready from cold condition to full load in 5 minutes.

Low power price
Even in countries where renewable energy is not yet significant in the power grid, the electrode boiler could be used in periods with low power prices e.g. in the night.


Grid Control
Typical SRL regulation curves at Infraserv Höchst, Frankfurt.
 



Steam Solutions

A steam grid is the perfect place to use excess power from renewable energy. When the electrode boiler runs, the traditional boilers can decrease their load and fossil fuel be saved.


Steam 

Market leader
The PARAT Electrode boiler is the world leading solution for Electrode Steam Boilers.

Steam is produced in the water between the electrodes. The internal circulation system brings water to the electrodes in a ratio 10:1 for the evaporation. The output is controlled by a throttle valve that regulates the level in the upper chamber.

Steam accumulates in the upper part of the pressure vessel and is released through the main steam valve. If the steam pressure increases over the setpoint, the power is automatically regulated down.

An important parameter related to optimal function of the boiler is the water conductivity. The conductivity is continuously monitored to ensure that the boiler gives the correct output. When the conductivity exceeds the selected setpoint automatic blowdown is initiated.

Super heating
Electrical steam super heaters can be delivered separately with low voltage supply.


Steam Principle

Principle diagram of Electrode Boiler Steam generation system.
 



Hot Water

A district heating network will always have the possibility to receive excess power from renewable energy. When the electrode boiler runs, the traditional boilers can decrease their load and save fossil fuel.

Hot Water 

By installing a thermal storage tank the capacity to receive large amounts of energy when the call for grid regulation is there. Thereafter the energy can be released from the tank when the client needs the heat.

Hot water is generated by circulating the boiler water through the upper chamber where the electrodes are suspended. The boiler vessel is pressurized with nitrogen, and due to the relatively low water volume the boiler also acts as an expansion vessel.

If temperature delivered to the client exceeds the setpoint, power of the boiler is automatically decreased. The output is controlled by a throttle valve that regulates the level in the upper boiler chamber.

An important parameter related to optimal function of the boiler is the water conductivity. Due to our optimal electrode design, water conductivity stays constant and thereby keeps water consumption at a minimum.

Our delivery includes piping, control valve and heat exchanger for heat supply to the district heating circuit.

Hot Water Principle

Principle diagram of Electrode Boiler hot water system.



Technical

Technical Specifications

Design codes
We deliver the boiler CE marked according to PED/2014/68/EU with boiler code EN12953. ASME stamp can be delivered as an option. The Electrode boiler is also available in EX version for installation in zone 2 hazardous areas. The Medium Voltage connection cell is designed according to EN 61936 for power installations.

Boiler principles
The boiler consists of an outer and an inner container. Inside the inner container, which is electrically insulated from the outer shell, the electrodes are suspended. The boiler is designed for 6 - 24 kV. Heat is generated by ohmic resistance in the water between the electrodes. The boiler acts as a pure ohmic resistance in the main circuit. The water and the inner container forms an insulated zero point in the star connection between the electrodes. PARAT has used this successful concept of electrodes since 1993. Thanks to the electrode geometry the current flux is so low that the electrodes are not worn out.

Control system
We have used our experience to develope a modern and robust boiler control system on the Siemens S7 Fail-safe PLC platform which is easy to use. The boiler is also available with PARAT remote monitoring system. This enables web-based remote monitoring of the boiler plant from anywhere in the world. This also includes online troubleshooting and upgrades of the control software from the PARAT service centre in Norway. Instrumentation can be 1oo2 or 2oo3.



Dimensions


The electrode boiler is a very compact unit. Even a boiler with 60 MW capacity will normally fit into an existing boiler house. The boiler shell is insulated as standard with 2x75 mm Rockwool and cladded with powder coated aluminum sheets. Visual parts are painted.

Boiler outer dimensions given for grid regulation boilers including insulation mantle. We reserve the right to make changes:

Dimensions
Steam Boiler:

Capacity (MW) 0-5 0-15 0-30 0-45 0-60
Steam (t/h) 7,5 22,5 45 67,5 90
D (mm) 2.100 2.350 2.700 3.000 3.500
H (mm)* 4.350 5.100 5.580 5.800 6.350
Transport weight (kg) 6.000 8.000 11.000 13.000 16.000
Operation weight (kg) 8.500 12.000 16.200 18.000 25.000
Test weight (kg) 13.500 25.000 29.000 34.000 46.000

Weight data is given for 16 barg design pressure. Size based on 6/10kV. Steam based on 100°C Feedwater temperature. Changes may occur. 

* If circulation pumps are placed at same level as boiler, an additional height must be added for pump NPSH.
 

Hot Water Boiler:

Capacity (MW)

0-5

0-15 0-30 0-45 0-60

D (mm)

2.100 2.350 2.700 3.000 3.500

H (mm)

4.350 5.100 5.580 5.800 6.350

Transport weight (kg)

4.500 6.000 9.500 10.500 11.000

Operating weight (kg)

7.000 9.500 14.000 15.500 20.000

Test weight (kg)

11.500 17.500 26.500 31.000 41.000

Weight data is given for 6 barg design pressure. Size based on 6/10kV. Changes may occur.

 
More information:
Reidar Frisell
Senior Sales Engineer
ref@parat.no
+47 99 48 55 27