Municipal sludge drying device

Abstract

The invention belongs to the field of solid waste treatment, and in particular relates to a municipal sludge drying device. The municipal sludge drying device comprises a roller with an axial line obliquely arranged and a driving component for driving the roller to rotate along the axial line thereof, wherein an accommodating cavity for accommodating sludge is formed in the roller; the accommodating cavity stretches and penetrates in an axial direction of the roller, and a feeding end of the accommodating cavity is positioned at the high end of the roller while a discharging end is arranged on the low end of the roller. Furthermore, the municipal sludge drying device comprises a heat supply passage for supplying heat to the accommodating cavity and an air return passage for collecting and removing fly ash waste heat after drying wet sludge, and the heat supply passage is arranged in a manner of communicating with the accommodating cavity; an air intake end of the air return passage is communicated with the accommodating cavity, and an air exhaust end is communicated with external fly ash waste heat treatment equipment. The municipal sludge drying device is high in sludge drying efficiency, and can avoid environmental pollution or even personal safety and other circumferences caused by a conventional device which discharges the fly ash waste heat along with the dry sludge; the municipal sludge drying device is concise in structure, reliable to operate, high in working efficiency, and safe and stable.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, in particular to an urban sludge drying device. Background technique [0002] With the continuous acceleration of urbanization and the development of modern industry. Every year, a huge amount of various types of municipal domestic sludge and industrial sludge are produced all over the world. For this reason, people began to look for a suitable process to effectively treat the above sludge. Sludge drying technology is a common technology that can effectively reduce the moisture content of sludge so that it can continue to be processed. Specifically, it is the process of heating the sludge in specially designed equipment and evaporating the water in it. It not only It can effectively remove the "free water" in the sludge, and at the same time, it can quickly evaporate the "interstitial water", "surface bound water" and even "internal bound water"; because this technology can According to th...

AI Technical Summary

Problems solved by technology

Among them, the direct heat transfer sludge dryer is described in the invention patent "Sludge Drying Process and Equipment" filed by the applicant Suzhou Zili Chemical Equipment Co., Ltd. on June 22, 2010. Most of them use high-temperature flue gas from the boiler as the heat source, make it directly contact with the wet sludge after entering the dryer, and directly bring out the moisture in the wet sludge through heat convection; this method has high dehumidification efficiency, but Due to the direct contact and precipitation of a large amount of flue gas and wet sludge, the dust content in the fly ash waste heat is huge, and due to the lack of proper follow-up dust separation measures, it is often prone to safety hazards such as dust explosions

In the indirect heat transfer sludge dryer, the sludge and the heat source are not in direct contact, but heat is transferred through heat conduction. For example, the applicant is the invention patent "Sludge Drying" applied by Zhejiang University on April 19, 2012 "Incineration Integrated Treatment System and Its Process" provides an indirect heat transfer sludge drying method. Since the sludge and heat source are artificially separated, the heating flue gas has good cleanliness and no related dust hazards. Therefore, it is often used; however, due to the current indirect heat transfer dryer or the static baking method similar to a pot, the sludge settles inside under the action of gravity and one-sided heating occurs, and the heating is not uniform enough. , so that the sludge to be treated cannot be dried evenly, and the dehumidification efficiency is poor. Even if the fixed and movable teeth are interlaced and the movable teeth are designed as hollow flues in the aforementioned patent text, the method not only leads to a complicated and cumbersome structure. It is extremely inconvenient to maintain, and at the same time, it will cause a large amount of sludge to accumulate in the lower chamber of the fixed teeth, resulting in the phenomenon that it cannot be baked through and directly sintered. The purpose of discharging after drying is obviously impossible to realize in terms of its mechanism; in addition, the current sludge dryer, because its sludge containing chamber always needs frequent contact with dry or wet sludge, its After severe friction, the wear rate of the housing cavity is extremely high, and the service life often affects the actual use efficiency of the whole machine

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