Pulse combustion drying system

Material drying equipment including a pulse combustor, an associated combustion chamber, the combination of the pulse combustor and combustion chamber generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, and a drying chamber connected to the introduction chamber, said tail pipe defining an interior passage of substantially uniform diameter from the outlet end to a position adjacent the inlet end of the tail pipe, and wherein said inlet end has a smaller diameter whereby hot gases issuing from the combustion chamber expand within the tail pipe after passage through the smaller diameter inlet end.

A method for operating material drying equipment of the type including a pulse combustor and an associated combustion chamber for generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, and a drying chamber connected to the introduction chamber, said method comprising the steps of introducing fuel and combustion air to the combustion chamber to form said hot gases, directing the hot gas pulses issuing from the outlet of the tail pipe into the introduction chamber, directing a bypass air stream separate from said combustion air into contact with said hot gases prior to entry into said introduction chamber for mixing with and cooling the hot gases, and feeding material to be dried through a feed pipe into the introduction chamber whereby the material is contacted by the mixture of the bypass air stream and hot gases.

A method for operating material drying equipment of the type including a pulse combustor and an associated combustion chamber for generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, and a drying chamber connected to the introduction chamber, said method comprising the steps of introducing fuel and combustion air to the combustion chamber to form said hot gases, restricting the entry of the hot gas pulses into said tail pipe from the combustion chamber, relieving the restriction upon said entry whereby the hot gases expand within the tail pipe, locating a mixing chamber between the outlet end of the tail pipe and said introduction chamber, feeding bypass air separate from said combustion air into said mixing chamber, and simultaneously feeding said hot hot gases into said mixing chamber for blending of the hot gases and bypass air prior to entry into the introduction chamber, directing the expanded hot gas pulses issuing from the outlet of the tail pipe into the mixing chamber, and feeding material to be dried into the introduction chamber and then into the drying chamber.

A method for operating material drying equipment of the type including a pulse combustor and an associated combustion chamber for generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, and a drying chamber connected to the introduction chamber, said method comprising the steps of directing the hot gas pulses issuing from the outlet of the tail pipe into the introduction chamber, feeding material to be dried into the introduction chamber, directing the combination of gases and material into the drying chamber, and providing an additional diluent air stream for movement into said drying chamber along with said combination of gases and material, said additional air stream operating to urge material already in the drying chamber away from the vicinity of entry of said combination of gases and material into the chamber.

Material drying equipment including a pulse combustor, an associated combustion chamber, the combination of the pulse combustor and combustion chamber generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber, for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, a drying chamber connected to the introduction chamber, cooling means for controlling the temperature of the hot gases issuing from the outlet of the tail pipe and entering the introduction chamber, said cooling means comprising a bypass air stream issuing into said introduction chamber along with the hot gases for mixing with and cooling the hot gases, a mixing chamber for said hot gases and bypass air stream located between the outlet end of the tail pipe and said introduction chamber, and including means for directing said bypass air stream into contact with the exterior surface of the tail pipe prior to issuing into the mixing chamber.

Material drying equipment including a pulse combustor, an associated combustion chamber, the combination of the pulse combustor and combustion chamber generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected to the introduction chamber, cooling means for controlling the temperature of the hot gases issuing from the outlet of the tail pipe and entering the introduction chamber, said cooling means comprising a bypass air stream issuing into said introduction chamber along with the hot gases for mixing with and cooling the hot gases, and including means for delivering a separate diluent air stream into contact with material issuing from the introduction chamber and passing into the drying chamber.

Material drying equipment including a pulse combustor, an associated combustion chamber, the combination of the pulse combustor and combustion chamber generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected to the introduction chamber, cooling means for controlling the temperature of the hot gases issuing from the outlet of the tail pipe and entering the introduction chamber, said cooling means comprising a bypass air stream issuing into said introduction chamber along with the hot gases for mixing with and cooling the hot gases, and wherein said tail pipe defines an interior passage of substantially uniform diameter from the outlet end to a position adjacent the inlet end of the tail pipe, and wherein said inlet end has a smaller diameter whereby hot gases issuing from the combustion chamber expand within the tail pipe after passage through the smaller diameter inlet end.

Material drying equipment including a pulse combustion, an associated combustion chamber, the combination of the pulse combustor and combustion chamber generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected to the introduction chamber, cooling means for controlling the temperature of the hot gases issuing from the outlet of the tail pipe and entering the introduction chamber, said cooling means comprising a bypass air stream issuing into said introduction chamber along with the hot gases for mixing with and cooling the hot gases, a feed pipe for feeding material to said introduction chamber, an outlet for the feed pipe positioned to feed material along a path substantially parallel to the flow of hot gases issuing from the tail pipe, and including means for directing said bypass air steam into contact with the exterior surface of the tail pipe prior to issuing into the introduction chamber.

Material drying equipment including a pulse combustor, an associated combustion chamber, the combination of the pulse combustor and combustion chamber generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected to the introduction chamber, cooling means for controlling the temperature of the hot gases issuing from the outlet of the tail pipe and entering the introduction chamber, said cooling means comprising a bypass air stream issuing into said introduction chamber along with the hot gases for mixing with and cooling the hot gases, a feed pipe for feeding material to said introduction chamber, an outlet for the feed pipe positioned to feed material along a path substantially parallel to the flow of hot gases issuing from the tail pipe, and including means for delivering a separate diluent air stream into contact with material issuing from the introduction chamber and passing into the drying chamber.

A method for operating material drying equipment of the type including a pulse combustor and an associated combustion chamber for generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, and a drying chamber connected to the introduction chamber, said method comprising the steps of directing the hot gas pulses issuing from the outlet of the tail pipe into the introduction chamber, directing a bypass air stream into contact with said hot gases prior to entry into said introduction chamber for mixing with and cooling the hot gases, feeding material to be dried into the introduction chamber whereby the material is contacted by the mixture of the bypass air stream and hot gases, and directing said bypass air stream into contact with the exterior surface of said tail pipe prior to issuing of said bypass air stream into said introduction chamber.

A method for operating material drying equipment of the type including a pulse combustor and an associated combustion chamber for generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, and a drying chamber connected to the introduction chamber, said method comprising the steps of directing the hot gas pulses issuing from the outlet of the tail pipe into the introduction chamber, directing a bypass air stream into contact with said hot gases prior to entry into said introduction chamber for mixing with and cooling the hot gases, feeding material to be dried through a feed pipe and into the introduction chamber whereby the material is contacted by the mixture of the bypass air stream and hot gases, locating a mixing chamber between the outlet end of said tail pipe and said introduction chamber, feeding the hot gases and bypass air into said mixing chamber prior to directing the mixture into the introduction chamber, and providing means for heating or cooling the feed pipe to control the temperature of material being fed to the introduction chamber.

A method for operating material drying equipment of the type including a pulse combustor and an associated combustion chamber for generating a pulsating flow of hot gases, a tail pipe connected at the outlet of the combustion chamber for receiving the pulsating flow of hot gases, a material feed introduction chamber connected at the outlet of the tail pipe, and a drying chamber connected to the introduction chamber, said method comprising the steps of directing the hot gas pulses issuing from the outlet of the tail pipe into the introduction chamber, feeding material to be dried into the introduction chamber, directing the combination of gases and material into the drying chamber, providing an additional diluent air stream for movement into said drying chamber along with said combination of gases and material, said additional air stream operating to urge material already in the drying chamber away from the vicinity of entry of said combination of gases and material into the chamber, said introduction chamber being defined by surrounding air permeable or perforated walls, and including the step of passing part of said diluent air stream through said walls while said material is being fed to said introduction chamber.