Comprehensive sludge treating method based on hydrothermal carbonization and fast microwave pyrolysis

A hydrothermal carbonization and comprehensive treatment technology, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of high water content in sludge and achieve a high degree of resource utilization , Overcoming the effect of low calorific value and reducing energy consumption

Inactive Publication Date: 2015-02-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0009] Aiming at the technical defects of rapid temperature rise in existing sludge heat treatment and the shortcomings of high moisture content of sludge, the present invention propos

Method used

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  • Comprehensive sludge treating method based on hydrothermal carbonization and fast microwave pyrolysis

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Send dewatered sludge with a mass of 100g and a moisture content of about 76.2wt% to the sludge preheating system to preheat to 90°C;

[0035] (2) The preheated sludge is pumped into the sludge hydrothermal carbonization reactor for hydrothermal carbonization reaction. The hydrothermal reaction temperature is 180 °C, the autogenous pressure is 2.2 MPa, the reaction time is 0.5 h, the rotation speed is 120 rpm, and the Into nitrogen to ensure that the reaction is carried out in an inert atmosphere;

[0036] (3) The obtained hydrothermal carbonization product is subjected to solid-liquid separation with a filter. The hydrothermal cracking filtrate (170 ℃) enters the pipeline of the sludge preheating system to preheat the dewatered sludge; the separated solids are mechanically dehydrated to obtain 36.9g of hydrothermal sludge carbon with a moisture content of 37.6 wt%;

[0037] (4) After the hydrothermal cracking filtrate preheats the dewatered sludge, it enters the d...

Embodiment 2

[0040] (1) Send dewatered sludge with a mass of 100g and a moisture content of about 76.2wt% to the sludge preheating system to preheat to 110 °C;

[0041] (2) The preheated sludge is pumped into the sludge hydrothermal carbonization reactor for hydrothermal carbonization reaction. The hydrothermal reaction temperature is 220 °C, the autogenous pressure is 4.5 MPa, the reaction time is 1.0 h, the rotation speed is 150 rpm, and the Into nitrogen to ensure that the reaction is carried out in an inert atmosphere;

[0042] (3) The obtained hydrothermal carbonization product is subjected to solid-liquid separation with a filter. The hydrothermal cracking filtrate (200 ℃) enters the pipeline of the sludge preheating system to preheat the dewatered sludge; the separated solids are mechanically dehydrated to obtain 33.2g of hydrothermal sludge carbon with a moisture content of 31.2wt%;

[0043] (4) After the hydrothermal cracking filtrate preheats the dewatered sludge, it enters the ...

Embodiment 3

[0046] (1) Send dewatered sludge with a mass of 100g and a moisture content of about 76.2wt% to the sludge preheating system to preheat to 125 °C;

[0047] (2) The preheated sludge is pumped into the sludge hydrothermal carbonization reactor for hydrothermal carbonization reaction. The hydrothermal reaction temperature is 250 °C, the autogenous pressure is 7.5 MPa, the reaction time is 1.5 h, the rotation speed is 200 rpm, and the Into nitrogen to ensure that the reaction is carried out in an inert atmosphere;

[0048] (3) The obtained hydrothermal carbonization product is subjected to solid-liquid separation with a filter. The hydrothermal cracking filtrate (230 ℃) enters the sludge preheating system pipeline to preheat the dewatered sludge; the separated solids are mechanically dehydrated to obtain 31.3g of hydrothermal sludge carbon, with a moisture content of 27.5wt%,;

[0049] (4) After the hydrothermal cracking filtrate preheats the dewatered sludge, it enters the depre...

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Abstract

The invention discloses a comprehensive sludge treating method based on hydrothermal carbonization and fast microwave pyrolysis. The method comprises two steps of hydrothermal carbonization and fast microwave pyrolysis of sludge. The hydrothermal carbonization is applied to pretreatment of the sludge at an earlier stage, and can be used for solving the difficulties of high moisture and low heating value of the sludge and improving the energy grade of the sludge from the sources; fast microwave pyrolysis is performed on the sludge carbon subjected to the hydrothermal carbonization, liquid fuel and combustible gas with better productivity can be obtained, and the residue solid cokes can be used as industrial raw materials, so that the energy source recycling with high efficiency and low pollution for the sludge is realized. The method has the advantages of high resource utilization degree, cleanness, environment protection, low operating cost and wide application prospect. Besides, the method is a method for fast treating the sludge.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a sludge comprehensive treatment method based on hydrothermal carbonization and microwave rapid pyrolysis. [0002] Background technique [0003] Accelerated urbanization and rapid industrial development have brought a large amount of urban sewage sludge and industrial sludge. Sludge has complex components, including heavy metals and pathogenic microorganisms, and must be properly treated to prevent secondary pollution to the environment. Therefore, in the new century of sustainable development, it has become a research hotspot to seek the harmless, reduction and resource disposal methods and technologies of sludge. [0004] The existing sludge treatment technologies mainly include landfill, composting and heat treatment. Heat treatment technology is mainly divided into two types: direct incineration and pyrolysis gasification. Compared with direct incineration, rapid pyrolysis tec...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/12C02F11/18
CPCY02W10/40C02F11/10C02F11/121C02F11/18C02F2103/001
Inventor 马晓茜林有胜彭晓为
Owner SOUTH CHINA UNIV OF TECH
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