Tubular pyrohydrolysis treatment method and device for sludge

Abstract

The invention provides a tubular pyrohydrolysis treatment method and device for sludge. The device consists of five main systems, namely a feeding system, a modification system, a dehydration system, a heat exchange system, and a purification system; and by adopting a catalyst injecting mode, the sludge is directly heated with medium pressure steam and is subjected to pyrohydrolysis at medium temperature, the remaining heat in the hydrolysis process is fully recycled, and a liquid-solid mixture is obtained, so not only supports of controllable components are provided for a compound fertilizer, but also a filter cake which is subjected to liquid-solid separation has an adjustable moisture content, namely the moisture content of the raw sludge can be reduced to 40 to 60 percent from about 80 percent. Compared with the prior art, the device has the advantages that: the structure is simple, the device can be continuously and stably operated, the sludge pyrohydrolysis temperature is 210 to250 DEG C, the reaction time is 10 to 20 minutes, the reduction and harmless treatment of the sludge can be economically, quickly and effectively achieved, the sludge can be treated on a large scale,and a novel approach is provided for the sludge treatment and the energy recycling of equipment.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a reduction and disposal technology for residual sludge after municipal sewage treatment, and in particular to a sludge tubular thermal hydrolysis treatment method and device. Background technique [0002] Municipal sewage often produces a large amount of sludge after treatment. With the improvement of people's requirements for environmental protection, the way of sludge treatment is also changing, from the need to purchase follow-up equipment for sludge treatment to the innovation and replacement of sludge conveying equipment and dehydration equipment, as well as the sludge drying, The emergence of equipment such as incineration and fertilizer making has met the requirements for final sludge reduction and harmless treatment. [0003] With the improvement of comprehensive national strength and the enhancement of environmental protection awareness, in recent years, ...

AI Technical Summary

Problems solved by technology

[0005] At present, the main problems in the treatment and disposal of excess sludge in municipal sewage treatment plants are: low utilization rate of equipment; sludge has not been treated for reduction, harmlessness and stabilization; Smell and pathogens are emitted, affecting environmental sanitation; the widespread use of chemical fertilizers has led to the neglect of sludge fertilizers; sludge without "three modernizations" has poor soil mechanical properties and biological stability, which is not conducive to conventional landfills and resources utilization

[0010] However, the above methods are only for the purpose of unilaterally reducing the moisture content of the sludge. The process requires high temperature and high pressure, high energy consumption, harsh equipment requirements, large-scale production is difficult, the process cannot be effectively guaranteed, and the sludge disposal is economical. high cost

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