초록 ▼

This invention comprises a combined cellulose sludge dryer and burner in which the drying procedure is positively and automatically controlled in response to the moisture content of the dewatered raw sludge supplied to the dryer headbox and carried through a drying chamber to discharge a dried sludg

This invention comprises a combined cellulose sludge dryer and burner in which the drying procedure is positively and automatically controlled in response to the moisture content of the dewatered raw sludge supplied to the dryer headbox and carried through a drying chamber to discharge a dried sludge having but a 15% moisture content and suitable to be burned to provide the hot air for the drying procedure. With the sludge being critical as to charring, a temperature of 300 degrees Fahrenheit to prevent pre-burning and charring of the sludge has to be maintained in the drying chamber and positive and automatic control for the hot air to maintain the temperature is done by checking differences between input and output temperatures of the dryer and diluting the air produced by the burner by the use of a heat exchanger and air dampers. The extracted wet air from the drying chamber and diverted over-supply of air to the drying chamber are delivered through a scrubber and chimney to the atmosphere. A series of opposing hot air and wet air extracting ducts are provided in the drying chamber for the handling of the drying air to direct it from beneath the travelling wire screen conveyor through the sludge particles thereon and passed to the extracting air ducts thereabove whereby to increase speed for drying sludge and the efficiency of temperature control equipment. Programmable computers are included to establish the control requirements and maintain the desired temperatures throughout the drying and burning operations.

대표청구항 ▼

A combined positive-controlled cellulose sludge dryer and burner process for drying and burning cellulose sludge that consists of the steps of dewatering the raw sludge by a mechanical press to reduce the water content to some 40% or more of its weight and provide a supply of caked sludge, crumbing

A combined positive-controlled cellulose sludge dryer and burner process for drying and burning cellulose sludge that consists of the steps of dewatering the raw sludge by a mechanical press to reduce the water content to some 40% or more of its weight and provide a supply of caked sludge, crumbing the caked sludge, metering and depositing the sludge crumbs onto a travelling wire screen conveyor, passing the material through a drying chamber and between opposing hot air and wet air extraction ducts assemblies to dry the sludge to have a moisture content of some 15%, removing the dried sludge from the wire screen and burning it to heat air for delivery to the hot air ducts and drying chamber to dry the sludge therein and automatically maintaining through appropriate controls a drying temperature of some 300 degrees Fahrenheit within the drying chamber and finally by means of the wet air extracting ducts exhausting the moisture-laden air and gases from the drying chamber to the atmosphere.