Method and device for reutilizing waste heat in sludge drying system
A drying system and sludge technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of environmental pollution, heat waste, low heat utilization rate, etc., achieve energy saving, increase heat utilization rate, and stable operation reliable effect
Active Publication Date: 2009-11-25
CHINA HUADIAN ENG +1
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Problems solved by technology
The evaporated water is not reused, but directly discharged into the middle of the atmosphere; therefore, the current sludge drying system has a low heat utilization rate, causing waste of heat and polluting the environment
Method used
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Embodiment Construction
[0018] The present invention will be described in further detail below in conjunction with the examples, but not as a limitation to the present invention.
[0019] Embodiments of the invention. Methods of waste heat reuse in sludge drying systems, such as figure 1 . The method is to divide the heating pipe in the drier 3 into two sections, the heating pipe at the sludge inlet is the front heating pipe 11, and the heating pipe at the sludge outlet is the rear heating pipe 13. The heating pipe in the dryer 3 can also be divided into three sections, the heating pipe at the mud inlet is the front heating pipe 11, and the heating pipe at the mud outlet is the rear heating pipe 13, which is located between the front heating pipe 11 and the rear heating pipe 13. The heating pipe between is the middle section heating pipe 12. Heat conduction oil or steam at 200-250°C is passed into the rear-stage heating pipe 13 to dry the sludge at the rear stage of the dryer 3; the sludge at the ...
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The invention discloses a method and a device for reutilizing waste heat in a sludge drying system. The method comprises the steps of: dividing a heating pipe in a dryer into a front section and a rear section or the front section, a middle section and a rear section from an inlet to an outlet; introducing high-temperature heating medium into the rear section of the heating pipe to dry sludge of the rear section; and introducing steam produced during the drying of the sludge of the rear section into the front section or / and the middle section of the heating pipe to dry sludge of the front section or / and the middle section. The method and the device only use the high-temperature heating medium to directly heat partial sludge in the dryer, and other heating medium adopts the steam produced during the heating of the sludge which is directly heated for recycling, so the energy consumption can be greatly saved, and the utilization rate of the heat is improved. The device does not need to input large cost during the retrofitting of the prior system, and ensures that the retrofitted system has steady and reliable operation.
Description
technical field [0001] The invention relates to a heat recycling method and device, in particular to a waste heat recycling method and device in a sludge drying system. Background technique [0002] Many lakes and rivers in our country contain a lot of silt or sludge, which contains a large amount of combustible substances. In order to save energy, people use a drying system to make the sludge into dry small particles as fuel. The current drying system is to send the sludge into the silo, and the feeder sends the sludge into the drier. The drier is provided with screw conveying and extruding devices. The silt is transported forward while being heated in the drier. Extruded by the screw device, the granular combustible product is discharged from the outlet of the dryer. [0003] The screw conveying device in the current sludge drying system is welded with spiral blades on a pipe, and a high-temperature heating medium is passed into the pipe that is used as a rotating shaft ...
Claims
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IPC IPC(8): C02F11/12
Inventor 黄湘李和平邱河梅贠小银廖玉华
Owner CHINA HUADIAN ENG