Dual-effect evaporation sludge drying system and drying method
A two-effect evaporation and sludge drying technology, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of secondary pollution and environmental pollution, achieve fast drying speed, high degree of automation, and avoid pollution. Effect
Inactive Publication Date: 2014-03-26
SCYHAO ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology
Sewage treatment plants have to discharge a large amount of excess sludge, and the huge amount of sludge needs to be further treated. If the sludge is not properly treated, it will cause secondary pollution
General urban domestic sewage plants or waste water plants produce a large amount of domestic sludge. The usual sludge treatment method is: after the domestic sludge is press-filtered, its water content is usually about 80%, and the sludge with high water content is mostly used used in landfill, high-temperature composting, etc., which is likely to cause new environmental pollution
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[0012] Example: such as figure 1 As shown, the present invention includes: a mud inlet pipe 2, a sludge mixing bin 1, a first-effect evaporator 7, an intermediate circulation pump 8, a second-effect evaporator 11, a circulation pump 12, a centrifugal separator 13, and a deoiler connected in sequence 15. Dry sludge bin 16; characterized in that: the top of the second-effect evaporator 11 is connected to the steam inlet of the side wall of the first-effect evaporator 7 through the sludge steam pipe 10, and the heat exchange tube in the second-effect evaporator 11 The steam inlet is connected to the steam boiler 17 through a pipeline; the bottom of the deoiler 15 is connected to the oil recovery device 14 through a pipeline, and the oil return pipe of the oil recovery device 14 is connected to the sludge mixing bin 1 .
[0013] The sludge mixing bin 1 is provided with a mixer 3 .
[0014] The top of the first-effect evaporator 7 is connected to the steam heat exchange device 5 a...
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The invention discloses a dual-effect evaporation sludge drying system, comprising a sludge charging pipe, a sludge mixing bin, a primary-effect evaporator, an intermediate circulating pump, a secondary-effect evaporator, a circulating pump, a centrifugal separator, a deoiling device and a dry sludge bin which are all connected in sequence, wherein the top of the secondary-effect evaporator is connected with a steam inlet in the side wall of the primary-effect evaporator through a sludge steam pipe, and a steam inlet of a heat-exchange pipe in the secondary-effect evaporator is connected with a steam boiler through a pipeline. A drying method comprises the steps of firstly, a sludge-oil mixing step; secondly, a multi-effect evaporation step; thirdly, an oil-solid separation step; fourthly, a condensed water-oil separation step. According to the dual-effect evaporation sludge drying system, by means of mixing sludge and oil to perform multi-effect evaporation, the characteristics of high automation degree, high sludge drying speed, oil recyclability, and no waste gas produced in a processing process are obtained; secondary waste gas pollution is effectively prevented.
Description
technical field [0001] The invention relates to a double-effect evaporation sludge drying system and a drying method, and belongs to the technical field of environmental protection sludge treatment. Background technique [0002] With the increasing discharge of urban industrial wastewater and domestic sewage, the urban sewage treatment rate has also increased year by year, and the sludge output of urban sewage treatment plants has also increased sharply. Sewage treatment plants have to discharge a large amount of excess sludge, and the huge amount of sludge needs to be further treated. If the sludge is not properly treated, it will cause secondary pollution. General urban domestic sewage plants or waste water plants produce a large amount of domestic sludge. The usual sludge treatment method is: after the domestic sludge is press-filtered, its water content is usually about 80%, and the sludge with high water content is mostly used used in landfill, high-temperature compost...
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IPC IPC(8): C02F11/12
Inventor 郎飞
Owner SCYHAO ENVIRONMENTAL PROTECTION TECH