Method and device for drying sludge by utilizing high-temperature steam

A technology of sludge drying and high-temperature steam, which is applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve problems such as environmental negative impacts and energy waste, reduce negative impacts, reduce energy waste, and improve thermal reaction efficiency Effect

Inactive Publication Date: 2010-01-20
PEKING UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the water vapor generated in the above several dewatered sludge treatment methods is directl...

Method used

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  • Method and device for drying sludge by utilizing high-temperature steam
  • Method and device for drying sludge by utilizing high-temperature steam
  • Method and device for drying sludge by utilizing high-temperature steam

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Embodiment Construction

[0031] see figure 1 , the present invention uses high-temperature steam to sludge drying equipment, including a drying drum 4, a screw feeding device 3 and a screw discharging device 10, and a screw feeding device 3 is installed at the head end of the drying drum 4. The tail end of the drying drum 4 is equipped with a screw discharge device 10 (including a collection bucket), and an exhaust port 11 is arranged on the drying drum 4, and the first induced draft fan 5 and the exhaust device (including a waste gas treatment device) are passed through. The input end of 6 is connected, and it is characterized in that: steam outlet 12 is arranged on described drying cylinder 4, and second induced draft fan 7, high-temperature heating device 8 and superheated steam injection device 9 are connected in sequence at this steam outlet 12, and this A superheated steam injection device 9 is arranged in the drying drum 4, and the steam input end of the superheated steam injection device 9 is ...

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Abstract

The invention relates to a method and a device for drying sludge by utilizing high-temperature steam, belonging to the field of treatment of excess sludge after sewage treatment in a sewage treatment plant, river dredging sludge treatment and night soil sludge treatment. The method comprises the following steps: carrying out the primary drying of dehydrated organic sludge with water content more than 70 percent by a drying drum through external disposable energy sources or a chemical heat-generating agent, recycling saturated steam from the primary drying process in the drying drum, heating the saturated steam by a high-temperature heating device to form superheated steam, leading the superheated steam into the drying drum, and further carrying out the direct-contact secondary drying of the dehydrated organic sludge in the drying drum. After the superheated steam is used, the lime addition volume is reduced to 14.06 percent from 17 percent before reconstruction, the temperature of the drying drum is improved to 60.81 DEG C from 54.54 DEG C, the temperature of outlet materials is improved by 8 percent, and the electricity consumption used by the superheated steam is only 3kW/h per hour; therefore, the aims of energy saving and emission reducing are achieved, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a treatment method and device for organic sludge, which is a treatment of residual sludge after sewage treatment in a dry sewage treatment plant through external disposable energy or chemical heating agents, including treatment of river dredging sludge, human excrement and urine Dehydrated organic sludge such as sludge is an energy-saving sludge treatment method and equipment. Background technique [0002] In recent years, the treatment methods of organic sludge that consume various energy include the use of part of waste heat, waste temperature, and chemical heat of lime heating agent, etc., all of which have not left the use of disposable energy. Energy consumption is thermally decomposed in an oxygen-free environment. In the process of using the decomposed sludge as low calorific value fuel and other carbonized products, various carbonization treatment methods are adopted, which inevitably increases the increase of carbon di...

Claims

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Application Information

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IPC IPC(8): C02F11/12
Inventor 刘阳生平山钢太郎中岛实木村壮次郎杨盛林陈子庭
Owner PEKING UNIV
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