How Do You Properly Maintain Two Boilers On Same Steam Header And Sequence For Shared Run Times?
Running boilers in parallel is not a simple control problem. Steam production on each boiler will be set by the firing rate. Therefore, the fuel valves must not only respond to the header steam pressure, but also to the steam flow for proper load distribution. *Changes to the firing rate are very detrimental to efficiency. Therefore, it is better to share load changes among several boilers to minimize losses. When taking one of the boilers from service, it is better to leave it under pressure from the steam header, instead of closing the header valve off. Otherwise, the boiler will cool down and it will take much longer to bring it back on line. The rise or drop in level will depend on how tight the feedwater and steam valves are shut. Either way, it is irrelevant, since you will have to go through the startup sequence, which may last several hours, before you can bring it back on line again. =============== However, from your question it appears that the boilers start firing at full t
