Plant Management
Optimising industrial cogeneration for reliable energy supply
Niclas Krantz looks at the engineering of industrial cogeneration plants in order to manage energy supply even during in-house or grid disturbances. Proper requirement management and dynamic analysis will enable superior results.
I
ndustrial cogeneration power plants are valuable sources of energy to process industries like pulp and paper, steel, petrochemical and
cement.Many plants use waste products for fuelling the boilers, which reduces the energy cost drastically.
More important is that these plants can be used to increase
the reliability of energy supply. If the cogeneration plant is optimized so that it can keep up steam and electricity supply even during and after disturbances in house or in the electric grid, it can strongly increase the competitiveness in terms of improved availability, product quality, and productivity, especially in developing markets where the power grids suffer from frequent outages and poor power quality.
Grid back-up
In Sweden, the availability of power of the public power system is very high, and still the cogeneration plants serve as an important back-up in the event of thunder lightning strikes and other disturbances in the grid. Cogeneration plants are generally far more complex
than conventional thermal power plants. Multiple boilers, several steam branches, steam accumulator, steam reductions, batch steam consumption, starting and stopping of electric equipment and weak grid connection are some reasons for the complexity.
If the best possible performance is required, it also requires state of the art engineering skills and methods. Solvina has developed superior methods for Engineering and Engineering Management to guarantee high quality results. We will describe the use of systematic Requirement Management and advanced Dynamic Simulator Based Engineering in a Cogeneration project (Fig. 1). The whole idea is to work with clear goals (requirements),
to include the whole plant dynamic behaviour in analyses, verify and validate project results and deliveries continuously, and not close a project until all requirements have been met.
Requirement management
In complex industrial plants, many stakeholders require different things of the plant. The owners want high efficiency and long plant life, the regulators require fulfilment of environmental law, the maintenance department requires easy maintenance, the plant itself requires certain quality of delivery, certain operating conditions that must be handled etc. The list is long, and there is a broad mix of very high- level requirements as well as detail requirements that have to be considered and mixed together. In order to design, tune and operate a plant in the most
optimal way, a lot can be won if an efficient requirement management (RM) system is in place. The RM system is
Fig. 1. The chain of activities in Requirement Management.
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