In order to start a thermoelectricity project, it is important to have a physical visit to the facilities in order to determine the waste heat ranges and the temperature in addition to the installation of the WHRU system.  The technical visit was made at Celsa (Castellbisbal, Barcelona) on May 11, 2018.

Heat Source

Thermographic measurements have been made in the the furnace zone, the casting area and in the beam blank.. The points analyzed are shown below:


Below you can see the results obtained

Beam blank - Load Zone


Name Average Min Max Emissivity Standard Deviation
Load zone 393,9 °C 74,5 °C 653,4°C 0,98 237,38ºC
Beam blank - Out

Name Average Min Max Emissivity Standard Deviation
Out 182,2°C 39,6°C 645,8°C 0,98 175,74ºC
Beam Blank - Linear Out

Name Average Min Max Emissivity Standard Deviation
Linear Out 188,4°C 43,9°C 619,2°C 0,98 191,36ºC
Smelting Furnace

Name Average Min Max Emissivity Standard Deviation
Smelting Furnace 143,1°C 46,0°C 812,0°C 0,98 114,76ºC
Smelting Area

Name Average Min Max Emissivity Standard Deviation
Smelting Area 15,9°C 0,2°C 422,8°C 0,98 14,17ºC
Bucket emptying area

Name Average Min Max Emissivity Standard Deviation
Bucket emptying area 85,5°C 14,3°C 530,4°C 0,98 – ºC


After the visit to CELSA S.A, we have identified different potential heat recovery points, all of them at high temperatures (above 500ºC).

To carry out the first pilot, special interest has been paid in the output of the beam blank. In this outlet, there are groups of 6 transmission rollers that allow up to a total of 6 metal beams to be distributed to a collector clamp at a time.

Once the beams reach the entire length, a bridge crane lifts the beam from its towing and resting area to a front area, where it is again dragged by another transmission system to an outside area, where it is transported to a cooling area.

In order to make a schedule to establish the performance of the equipment, the best case and worst case of the duration of the beam blank will be analyzed in the final drag zone, and the time it takes to replenish a new beam blank. This calculation will allow us to analyze the maximum and minimum performance cycles of the equipment as well as on a next visit, the maximum power that can be generated per hour. So that:

– The time that the beam remains in the unloading zone, and runs through column 2:
Worst case: 29 seconds, Best Case: 62 seconds.

– The replacement time between beam and beam:
Worst case: 64 seconds. Best case: 19 seconds.

The time in which the beam blank goes from the shock column on the right to the one on the left is 10 seconds. This means an additional 10 second stay of the beam blank in the exposure area (and electrical generation).

After analyzing the times, we consider it appropriate to choose the limit column on the left to mount the possible pilot, as additional exposure is achieved.