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Steam thermal cycle sludge drying method and system

A sludge drying and thermal cycle technology, applied in dehydration/drying/concentrated sludge treatment, etc., can solve the problems of unused water vapor, odor consumption of circulating cooling water, etc., to save material consumption and facilitate heat recovery , the effect of saving energy consumption

Active Publication Date: 2014-06-04
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0009] Other drying technologies do not use circulating process gas, and directly suck air into the dryer to take away the moisture of the sludge. The steam generated during the drying process and the inhaled air are discharged after condensation and purification. The air introduced by this type of technology mixes with the sludge and emits The gas produces a large amount of odor and consumes a large amount of circulating cooling water. After cooling down, deodorization treatment
The water vapor generated during the sludge drying process is not utilized

Method used

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  • Steam thermal cycle sludge drying method and system

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Embodiment Construction

[0026] The invention provides a method for drying sludge by steam heat circulation, comprising the following steps:

[0027](1) Before the sludge is dried, use steam condensate to preheat the wet sludge to 50-80 degrees Celsius in an airtight environment that can discharge a small amount of non-condensable gas, thereby reducing the amount of sludge caused by sludge during the drying process. If the surface temperature of the sludge is too low, the surface steam will condense, thereby improving the evaporation efficiency of the sludge. After heat exchange, the heat exchange condensate with a temperature higher than room temperature is adjusted and purified, and the water temperature drops to room temperature, and the heat exchange condensate lowered to room temperature is used as the heat-absorbing medium for drying sludge or part of it is used as the absorber for sludge cooling. The heat medium and the remaining part of the heat exchange condensate are discharged as waste wate...

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Abstract

The invention relates to a steam thermal cycle sludge drying method and system, wherein the method comprises the following steps of: (1) preheating sludge; (2) exchanging heat and drying the sludge from the step (1) by adopting steam as a heat source gas; (3) cooling and discharging the sludge from the step (2). The system comprises a preheating feeding device, a drying device, a technology cycle gas recycling device and a cooling and discharging device; the drying device comprises an evaporation chamber and a drying chamber which are sequentially connected; a sludge outlet of the preheating feeding device is connected with a sludge inlet of the drying device; a recycling steam outlet of the drying device is connected with a steam inlet of the technology cycle gas recycling device through a pipeline; the drying device is provided with a heat source gas inlet; and the heat source gas inlet of the drying device is connected with a steam outlet of the technology cycle gas recycling device through a heat source pipeline. According to the invention, energy source recycling measures are adopted, and the steam thermal cycle sludge drying method and system has the advantages of high evaporation efficiency, low cost, low energy consumption and the like.

Description

technical field [0001] The invention relates to a sludge drying method and a system used in the method, and belongs to the technical field of sludge treatment. Background technique [0002] As the country continues to increase environmental protection in recent years, remarkable achievements have been made in water environment governance, and the water treatment rate and compliance rate have continued to increase. However, all kinds of sludge produced in the water treatment process have formed new environmental problems. [0003] Sludge is the solid sediment produced in the sewage treatment process. In addition, it also includes the sediment produced in the industrial production process with relatively similar physical properties. The sludge referred to in the sludge treatment is mainly the biochemical sludge produced in the sewage treatment process. At present, sewage treatment departments are generally equipped with mechanical dehydration devices, and the moisture content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12
Inventor 周华堂许贤文陈扬陶卫克王新贾东辉靳薇赵义武赵培林
Owner BC P INC CHINA NAT PETROLEUM CORP
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