Holland-Controls executed commissioning support on a Siemens SGT-600 combined cycle plant, producing steam and electricity for internal plant use. The gas turbine, located at an animal food industry plant in The Netherlands, underwent its yearly inspection, the biggest scope being a level C with manpower mostly from #PowerTech Turbine Parts, instead of the OEM.
The commissioning support to PowerTech was provided by Holland-Controls’ controls engineer Gabor Stocker.
Bypass System
Added to the scope of the inspection was a new system been installed to reduce CO emission. Holland-Controls used a standard OEM Logic example to program the new system, in order to commission it together with the PowerTech Commissioning Expert.
The new system is called Bypass System consisting of 6 valves actuated by a moving ring which is actuated by a stepper motor driven arm. The ring is positioned around the combustion chamber. The stepper motor was of a new type, so the configuration had to be adapted. Most parts of the new system were supplied by the OEM to the customer.
Test run
After the inspection, running tests were carried out including field balancing with satisfactory results. Load- and emission tests were carried out with significant improvement in emission levels compared to prior performance.
Emission control is active from 12MW load, and by 15 MW the CO emission is down to 35-45 mg/m3 (government limit is 100 mg/m3), by 20 MW load CO got reduced to around 10 mg/m3. The main reason for the reduced emission is that the flame temperature is kept at 1400 °C and that is reached by 12 MW with the new system, opposed to the old status where this was not even reached at 18 MW.
Once again proving that with our extensive expertise, any problem with your gas turbine can be resolved.
Adam Smithstraat 6
7559 SW Hengelo
The Netherlands
