Cogeneration, Gas

Siemens to provide turbines, as-a-service solutions at Brazilian cogeneration plant

Braskem, the largest petrochemical company in Latin America, recently entered into an agreement with Siemens to modernize a cogeneration power and steam plant at its Petrochemical Complex in Sao Paulo, Brazil. Completion of the project is expected in early 2021.

Siemens will be responsible for implementation and the 15-year operation of an electric and steam cogeneration plant. Project deployment is already underway, whereby Siemens will implement a fully integrated and redundant equipment solution, including two SGT-600 gas turbines, an E-house, as well as an extension of the existing high-voltage substation, three reciprocating compressors, an advanced load-shedding system, and associated software for plant control.

These elements are part of an energy-as-a-service concept, which means that the customer will receive the energy without having to invest in, build, and operate the plant on its own.

“This energy-as-a-service contract underscores the value our newly aligned Siemens Gas and Power Operating Company brings to customers, with synergies crossing the entire energy value chain,” said Tim Holt, Chief Operating Officer of Siemens Gas and Power, effective April 1, 2019.

Braskem’s project involves the complete overhaul and technological update of the existing cogeneration plant, which provides steam and power to the petrochemical complex’s cracking unit. The unit has an ethylene production capacity of 700,000 metric tons per year (kta) and produces raw materials for the chemical and plastic sectors. The optimized design leads to an increased efficiency of the ethylene plant. Braskem estimates that the upgrade project will reduce the cracking unit’s water consumption by 11.4 percent and CO2 emissions by 6.3 percent.

The power output of an SGT-600 turbine is 24 megawatts (MW). For this application, each turbine will provide 19 MW of power and 80 tons per hour (t/h) of steam. In addition, they will feature third-generation dry low emissions (DLE) technology and run on residue gas with high concentrations of hydrogen. The DLE technology will reduce CO2 emissions, and NOx levels from the turbines will be low at just 25 parts per million (ppm). A load shedding system ensures safe operation of the plant by managing all loads depending on the available power supply.

 “The combined cogeneration of electricity and gas with this project exemplifies our efforts to achieve greater operational excellence and reinforces our commitment to sustainable development,” said Braskem Chemicals southeast region chief industrial officer, Luís Pazin. “The modernization will help us meet our sustainability goals by reducing the facility’s overall energy consumption by an amount equivalent to that of a city with one million inhabitants.”