Film pressure thermal dehydration method and equipment for high-moisture sludge

Abstract

The invention discloses a film pressure thermal dehydration method and equipment for high-moisture sludge, and belongs to the technical field of sludge dehydration. The method is characterized by comprising the following steps of: spreading the sludge subjected to conventional mechanical dehydration into a film of 1 to 10mm, regulating hot extrusion temperature and pressure for partition wall hot extrusion dehydration, separating out moisture in a liquid form, and further applying the sludge after the moisture is separated out. The invention has the advantages that: the energy consumption is low, and the energy utilization rate is high; in the dehydration process, seamless compression is adopted, and a wall-sticking phenomenon of conventional equipment is avoided, so that the whole dehydration process is smooth and feasible; and the process flow is simple and high in feasibility, other substances are not introduced, and the further treatment and recycle of the sludge are not influenced.

Description

technical field [0001] The invention belongs to the technical field of sludge dewatering, and relates to a method and equipment for dehydrating sludge with high water content, in particular to a method and equipment for dehydrating sludge with high water content by film pressure heat. Background technique [0002] Sludge is an inevitable product of urban sewage treatment, with a water content as high as 97%. It has complex components, poor stability, and is easy to stink, so it must be treated in a timely and effective manner. Sludge contains a large amount of organic components, which can be converted into resources and utilized to achieve sustainable development. Usually, the concentrated sludge is directly treated by traditional mechanical dehydration methods, such as filter dehydration, vacuum dehydration, centrifugal dehydration, and screw press dehydration. The moisture content of the dehydrated sludge is usually about 80%, with high moisture content and large volume. ...

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Problems solved by technology

However, the introduction of organic solvents prevents the sludge from being used as a biological fertilizer, and the tail gas treatment load is increased during the incineration and pyrolysis process. Therefore, there are still barriers to specific applications.

[0005] The publication date is April 18, 2007, the publication number is CN1948192A, and the invention patent application number is 200610016350.2 discloses a sludge dewatering process and device, and proposes that the sludge after press filtration is supplemented with ultrasonic conditioning and pressure-assisted electroosmosis dehydration And adsorption dehydration, so as to realize the interaction of sludge dewatering process. This process is coupled with multiple dehydration methods. The whole process equipment is complicated and difficult to operate.

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