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

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...

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Problems solved by technology

[0008] However, the water vapor generated in the above several dewatered sludge treatment methods is directly or indirectly discharged into the atmosphere, which has a negative impact on the environment and waste of energy.

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