System for drying sludge by virtue of diversified heat energy

Abstract

The invention discloses a system for drying sludge by virtue of diversified heat energy. The system comprises a sludge drying platform and a drying chamber body which is arranged on the sludge drying platform in a closed manner and is sealed with the sludge drying platform, wherein the drying chamber body is provided with a heat energy storage device, a gas circulation device and a sludge receiving and conveying device; the sludge drying platform comprises a sludge spreading table and a geothermal heating device arranged at the bottom of the sludge spreading table; the drying chamber body is also provided with a sludge inlet and a dry sludge outlet, the sludge inlet is connected with an external sludge conveying device, and the dry sludge outlet is connected with an external dry sludge conveying device. According to the technical scheme of the invention, the environmental pollution caused by toxic gas, generated in a sludge drying process, discharged to the atmosphere is avoided; sludge is arranged on the sludge spreading table; the sludge drying cycle is shortened and the drying efficiency is improved through the geothermal heating device at the bottom of the sludge spreading table and the gas circulation device of the drying chamber body; due to the sludge receiving and conveying device, the manual intervention in a drying process is avoided, the drying efficiency is improved, and the drying process is safe.

Description

technical field [0001] The invention belongs to the field of thermal energy utilization, and more specifically, the invention relates to a system for drying sludge by utilizing multiple thermal energy. Background technique [0002] Sludge is the product of sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc.; sludge is mainly divided into domestic sewage sludge, industrial wastewater sludge, etc. according to its source. Sludge and water supply sludge, the main characteristics of sludge are high water content, which can be as high as 90%, high organic content, easy to rot and smell, and fine particles, small specific gravity, colloidal liquid state, which is between liquid and Thick matter between solids can be transported by pump, but it is difficult to separate solid and liquid by sedimentation; sludge is a very good building material filler after drying, has a certain calorific val...

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Problems solved by technology

[0002] Sludge is the product of sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc.; sludge is mainly divided into domestic sewage sludge, industrial wastewater sludge, etc. according to its source. Sludge and water supply sludge, the main characteristics of sludge are high water content, which can be as high as 90%, high organic content, easy to rot and smell, and fine particles, small specific gravity, colloidal liquid state, which is between liquid and Thick matter between solids can be transported by pump, but it is difficult to separate solid and liquid by sedimentation; sludge is a very good building material filler after drying, has a certain calorific value after drying, and can be added to fly ash Made into combustion blocks, which can reduce the demand for coal combustion; however, sludge drying has disadvantages such as long evaporation period, large resource consumption, unsatisfactory drying degree, and release of a large amount of toxic gas during drying. During the drying process, large amounts of toxic gases are released, including methane, hydrogen sulfide and dioxins

[0003] Chinese patent zl201020130804.0 discloses a multi-layer active solar sludge drying chamber. The technical solution of this patent is to use a closed space, and the top of the space collects solar energy as a drying heat source, and the sludge is tiled with multi-layer separation layers in the space. However, the technical solution of this patent is to discharge the gas generated in the drying process into the atmosphere through the pipeline, causing toxic gas to pollute the environment

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