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Posted by amir rahbar on February 21, 2002 at 02:14:18:
In Reply to: Re: cooling a hot boiler posted by Carl on April 02, 2000 at 20:18:54:
: : We have encountered a fairly insistant customer who has asked us for a written procedure for emergency shut down and cooling of a wood-fired HRT steam boiler. Can anyone post such a procedure or make reference where a manufacturers procedure might be available. Thanks in advance!
: : Roger
: I am a bit confused here, as on the one message you say "emergency" and the other you say "normal" situations? Anyway, the purpose of cooling is to allow the refractory setting, if we are speaking strictly of HRT designs, adequate time to expand on heating and shrink on cooling. Forceing rapid starting or cooling will allways result in sidewall shift, arch breakdown and lead to loss of structural integrity. The boiler metal parts can safely be fired well beyond the capacity for the refractory portions of the boiler to cope. If you want details I would suggest an older steam power source book. Basically the firing methods used for coal in HRT boilers is the same. You can use the start stop regiem mentioned in a number of older books on stationary firing practices.