When starting up, shutting down and during significant load changes, mechanical and thermal stresses arising in thick-walled boiler elements. In order to prevent allowable values from being exceeded, main thick-walled elements are monitored.
The difference between the permissible stress values and their actual values is defined as the stress margin. This margin is controlled in real-time for all of the thick-walled elements, which may affect the boiler start-up or shutdown speed. This value indicates to the operator current possibilities of speeding up boiler start-up process at any time.
The operations control module includes tools for start-up coordination.
|
Heat accumulation in boiler evaporator monitoring
|
A dynamic model of the boiler reflecting heat accumulation process is used as the basis for calculations. The figure (see below) presents a part of the boiler operator on-screen interface. It shows the current build-up accumulation curve and superimposed both points: current and optimal steam flow from the boiler. Comparison of cuurent and optimal steam rate makes it easy to coordinate start-up process of the boiler. The boiler start-up module is equipped with context-sensitive assistance system for the operator. Its purpose is to remind the operator about activities that need to be performed at specific times or to display warnings regarding unacceptable statuses. |
The start-up control module permits the boiler start-up process to be managed in a way, which minimizes start-up losses and ensures safe operating conditions.
Wszelkie Prawa Zastrzezone 2006 Enerbit.
