During start-up, shut-down and during severe load changes, mechanical and thermal stresses occur in thick-walled boiler components. In order to avoid exceeding those values that are permissible, the main thick-walled components are monitored.
The difference between the permissible stress value and the actual stress value is defined as the stress margin. This margin, for any thick-walled component which may affect the boiler start-up or shut-down speed, is monitored online. This parameter informs the operator of the possibility of increasing the start-up speed at a given time.
The operation monitoring module contains the tools required for start-up coordination. The basis for the calculation is the model which maps the heat accumulation process in the evaporator volume and in the economizer.
Operator's interface for boiler start-up
The picture (above) shows a fragment of the screen graphics for the boiler operator. The current heat accumulation curve and the current and optimal steam stream from the boiler are indicated.
After the heat accumulation process in the evaporator has been coordinated, it becomes possible to determine the acceptable increase in the fuel stream to the boiler and the received steam stream.
Both types of load margin enable the start-up to be conducted at the maximum speed. Both types of load margin enable the start-up to be conducted at the maximum speed.
The boiler start-up monitoring module is provided with a context-sensitive prompt function for the operator. Its objective is to remind the operator of those activities that are necessary to be performed at any given moment or to display warnings about unacceptable states.
The start-up monitoring module enables the boiler start-up to be conducted with as few start-up losses as possible. Operational safety conditions are then met.
download brochure "Boiler Start-up Monitoring" (0,1 MB)
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