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Method for drying sludge by cyclonal flash evaporation and drying device thereof

A drying equipment, flash drying technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of wasting heat source, high moisture content of waste sludge, large volume, etc., to improve drying efficiency and strengthen mass transfer hot effect

Inactive Publication Date: 2012-05-02
HEFEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Waste sludge from sewage treatment plants has a high water content and a large volume, making it difficult to be directly treated by incineration or landfill. Therefore, it is first necessary to dry the sludge to reduce the moisture and volume of the sludge. The traditional drying method is to heat and dry the sludge under normal atmospheric pressure, but in this drying method, 100°C is the highest temperature that liquid water can allow under this pressure, and reheating cannot increase the temperature of the water, and It can only convert water into steam, its drying speed is slow, and waste heat source at the same time

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  • Method for drying sludge by cyclonal flash evaporation and drying device thereof
  • Method for drying sludge by cyclonal flash evaporation and drying device thereof

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Embodiment 1

[0011] A method for cyclone flash drying sludge, the step conditions are: put the wet sludge in the drying equipment, feed hot air to increase the pressure in the drying equipment, and then carry out the decompression treatment; the wet sludge is under stirring state. The wet sludge is treated with high pressure and high temperature by hot air, and then decompressed to reduce the boiling point of the wet sludge. At this time, the temperature of the water in the sludge is higher than the boiling point under normal pressure conditions, and the water boils rapidly in the drying equipment Vaporization and two-phase separation, so that the water can be gasified, and the sludge drying process can be quickly realized.

[0012] The temperature of the hot air is 150-280°C. The temperature in this range can achieve a good drying effect. The temperature should not be too high. On the one hand, it will cause too much pressure in the drying equipment, which is a test for the drying equip...

Embodiment 2

[0014] A kind of drying equipment for cyclone flash drying sludge, such as figure 1 As shown: the drying equipment includes a dryer 7, the dryer 7 is provided with a wet sludge feed port 5, the bottom is provided with an agitator 4 and a hot air inlet 3, and the upper part is provided with a water vapor and hot air outlet 9. A pressure relief valve is provided at the water vapor and hot air outlet 9. The specific use state is that the wet sludge is put into the dryer, the wet sludge and the hot air are fully mixed, and the pressure is reduced after reaching a certain pressure. The moisture in the sludge is rapidly boiled and vaporized in the drying equipment by centrifugation, shearing, collision and friction, and the sludge is also granulated at the same time. Due to the rotating flow of the gas-solid two-phase, the inertia of the solid phase is greater than that of the gas phase, and the solid-gas The relative speed between the two phases is relatively large, which strength...

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Abstract

The invention aims to provide a method for drying sludge by cyclonal flash evaporation. In order to achieve the purpose, the technical scheme provided by the invention is as follows: a method for drying sludge by cyclonal flash evaporation comprises the steps of: placing wet sludge in a drying device, introducing hot air to pressurize the drying device and then reducing the pressure, wherein the wet sludge is in an agitating state. According to the treatment method provided by the invention, the wet sludge is treated at high pressure and temperature by the hot air and then depressurized so that the boiling point of the wet sludge is lowered. At the moment, the water temperature in the sludge is higher than the boiling point under normal pressure and the water is boiled and evaporated rapidly in the drying device to perform two-phase separation so as to evaporate the water to dry the sludge rapidly.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for cyclone flash drying sludge and drying equipment thereof. Background technique [0002] Waste sludge from sewage treatment plants has a high water content and a large volume, making it difficult to be directly treated by incineration or landfill. Therefore, it is first necessary to dry the sludge to reduce the moisture and volume of the sludge. The traditional drying method is to heat and dry the sludge under normal atmospheric pressure, but in this drying method, 100°C is the highest temperature that liquid water can allow under this pressure, and reheating cannot increase the temperature of the water, and It can only convert water into steam, which has a slow drying speed and wastes heat source at the same time. Contents of the invention [0003] The main purpose of the present invention is to provide a method for cyclone flash drying sludge. [0004] In order t...

Claims

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Application Information

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IPC IPC(8): C02F11/12
Inventor 金杰吴克王学军俞志敏董强刘斌
Owner HEFEI UNIV