Sludge multi-level resource comprehensive-utilization method and utilization system thereof

Abstract

The invention discloses a sludge multi-level resource comprehensive-utilization method and a utilization system thereof. The comprehensive utilization method comprises the following steps of (1) preliminary treatment of sludge, (2) pyrolysis of the sludge and hot flue gas, (3) oil and gas separation, (4) resource utilization and (5) preparation of finished products of resource. The utilization system comprises a sludge treatment and transportation device, a pyrolysis reaction device, an oil and gas separation device, a kiln, a sludge coke resource treatment device, a finished product device and an automatic control device. An automatic control device controls the work of the other devices. High-efficiency, energy-saving and pollution-free sludge resource treatment can be realized.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, and more specifically, relates to a comprehensive utilization method and a utilization system of sludge multi-stage resource utilization. Background technique [0002] The goal of sludge disposal is to reduce, stabilize, harmless and eventually recycle, which is not only convenient for transportation and consumption, but also reuses polluted resources. Among the current various treatment methods, the cost of input from low to high is landfill, digestion and utilization, and co-incineration. [0003] Sanitary landfill disposal does not meet the current national sludge treatment and disposal policy requirements. After the sludge is landfilled, it still contains a large amount of water inside and produces a large amount of landfill leachate. Improper disposal pollutes local water sources and occupies a large amount of land. mud landfill trend. [0004] Digestion is divided into anaerobic ...

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Problems solved by technology

Anaerobic digestion cannot completely treat all sludge at one time. The digestion process is difficult to meet the requirements of sludge harmlessness. It is often necessary to perform high-temperature thermal hydrolysis before anaerobic digestion. There are safety risks in the process of anaerobic biogas production and biogas storage. However, domestic sludge has low organic matter content and high sand content, and the fertilizer content is difficult to meet the requirements of fertilizer production. There are difficulties in selling fertilizers, and through thermal hydrolysis, anaerobic, and aerobic processes, the investment is large and the operating costs are high. Wastewater, Odor and heavy metals exceeding the standard are difficult to control

[0005] The incineration process has obvious advantages in terms of sludge reduction and harmlessness, and the sterilization effect is thorough. Before sludge incineration, the moisture content of sludge should be reduced as much as possible to increase the calorific value of sludge. The general incineration device is the same as the sludge The drying process is integrated, the one-time investment of treatment equipment is large, the energy consumption and treatment cost are high, and heavy metals after sludge incineration may enter the atmosphere with the diffusion of smoke and dust to cause secondary pollution

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