PYROFLOW CFB BOILER MEETS THE DYNAMIC CHALLENGES OF UTILITY OPERATION

摘要

Large size CFB units supplied to utilities are required to respond rapidly and accurately to the system load demand signals. These units are designed to receive demand signals from load demand computers (economic dispatch systems), and by various types of feed forward controls to achieve the desired level of generation in a minimum amount of time, with minimum upset to the steam conditions. Pyropower Corporation supplied a 165 MWe net capacity CFB boiler to the Nova Scotia Power Inc., Point Aconi Station. This boiler was subjected to a number of tests to demonstrate the dynamic response of the boiler. The tests included minor and major load rejections as well as rapid increase and decrease of load. One of the tests was to demonstrate the ability to reject from full load to the house load and operate for eight hours. This report summarizes the experience of these tests, which leads to the conclusion that CFB boilers, when properly designed and tuned, are capable of meeting the present day challenges of dynamic response in dispatch mode of operation. The paper also draws references from other large size Pyroflow CFB units that are operating in cycling modes to address the capabilities of the CFB boilers related to rapid load variation.