System for discharging bottom ash from steam-producing boilers
OwnerMario Magaldiinventor
Life of this patent
Estimating the term…
Abstract
A system for discharging ash comprises a hopper provided with a system of hydraulically activated valves having the function of separating the hopper environment from the extractor environment, thereby creating an accumulation store inside the hopper which allows brief shutdowns for any required maintenance in the downstream extractor and the plant, and which prevents the direct falling of large lumps of agglomerated ash onto the belt and also, in the case of a multifuel boiler, avoids radiation to the extraction belt when gas or oil is used as fuel. Downstream of the area of ash discharge from the extractor a system of crushing, cooling, transport and storage of the ash is also provided.
Claims30
A bottom ash dry discharge system for a steam-generating boiler, comprising a modular system having:
- (a) an extractor including a conveyor belt resistant to high temperatures, constructed so as to allow expansion in any direction, the conveyor belt having two separate but joined elements for performing, respectively, the functions of load support and driving;
- (b) a tight sealed box supporting the extractor;
- (c) a transition hopper attached to a bottom of the boiler and united to the extractor;
- and
- (d) apparatus for crushing, cooling, and transporting dry ash discharged from the extractor.
A bottom ash discharge system for a steam-generating boiler, comprising a modular system having:
- (a) an extractor including a conveyor belt resistant to high temperatures, constructed so as to allow expansion in any direction, the conveyor belt having two separate but joined elements for performing, respectively, the functions of load support and driving;
- (b) a tight sealed steel box supporting the extractor;
- (c) a transition hopper attached to a bottom of the boiler and united to the extractor;
- and
- (d) apparatus for crushing, cooling, and transporting ash discharged from the extractor;
- wherein one element of the conveyor belt is composed of a series of steel plates forming a continuous trough for performing the load supporting function, and another element of the conveyor belt is a steel wired belt, having high resistance, for performing the driving function.
A bottom ash discharge system for a steam-generating boiler, comprising a modular system having:
- (a) an extractor including a conveyor belt resistant to high temperatures, constructed so as to allow expansion in any direction, the conveyor belt having two separate but joined elements for performing, respectively, the functions of load support and driving;
- (b) a tight sealed steel box supporting the extractor;
- (c) a transition hopper attached to a bottom of the boiler and united to the extractor;
- and
- (d) apparatus for crushing, cooling, and transporting dry ash discharged from the extractor;
- wherein the crushing, cooling, and transporting apparatus includes a precrusher for reducing incrustations of exceptional dimensions in order to increase thermal exchange surfaces with cooling fluid in a postcooler.
A method for dry discharge of bottom ash from a steam-generating boiler comprising the steps of:
- discharging any bottom ash from the boiler;
- guiding the dry bottom ash through a transition hopper;
- receiving, from the transition hopper, the dry bottom ash onto a conveyor belt;
- discharging the dry bottom ash from the conveyor belt;
- and
- crushing, cooling, and transporting the dry bottom ash discharged from the conveyor belt;
- wherein the transition hopper includes a hatch valve, and further comprising the step of re-irradiating thermal flow in the boiler by facing the transition hopper, hatch valve, and conveyor belt onto a flame in the boiler.
A method for dry discharge of bottom ash from a steam-generating boiler comprising the steps of:
- discharging dry bottom ash from the boiler;
- guiding the dry bottom ash trough a transition hopper;
- receiving, from the transition hopper, the dry bottom ash onto a conveyor belt;
- discharging the dry bottom ash from the conveyor belt;
- and
- crushing, cooling, and transporting the dry bottom ash discharged from the conveyor belt;
- wherein the step of crushing, cooling, and transporting the dry bottom ash includes drawing outside air through at least one opening in a postcooler, passing the outside air in countercurrent to the ash and the conveyor belt, thus exchanging heat with a discharge system and the ash and feeding the combustion of unburnt matter, and reintroducing this heat into the boiler.
Dependencies are inferred from the claim text.