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Sludge biological carbonizing technology based on hydrothermal reaction

A technology of hydrothermal reaction and hydrothermal reactor, which is applied in dewatering/drying/concentrating sludge treatment, biofuel, sludge treatment by temperature control, etc. and the effect of significant ecological benefits, energy saving and low consumption

Active Publication Date: 2013-01-16
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no public report on the preparation of biochar from sludge after hydrothermal modification and dehydration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Dewater the sludge from the sewage treatment plant and send it to the sludge pre-storage bin for storage;

[0032] 2) Send the stored dewatered sludge (water content 70-85wt%) into the preheating system to preheat to 110°C;

[0033] 3) The preheated dewatered sludge is sent to the hydrothermal reactor for heat treatment to obtain the hydrothermal cracking liquid. The heating temperature in the hydrothermal reactor is 200°C, the heating time is 90min, and the autogenous pressure is 3MPa;

[0034] 4) Return the hydrothermal cracking liquid obtained in the previous step to the heating pipeline in the preheating system for preheating the dewatered sludge. The heating pipeline is multi-section, and a back pressure is installed between each two heating pipelines. Valve, after the hydrothermal cracking liquid is discharged from the last section of heating pipeline, the temperature is lowered to below 85°C, and gaseous products are obtained at the same time;

[0035] 5) The...

Embodiment 2

[0039] 1) Dewater the sludge from the sewage treatment plant and send it to the sludge pre-storage bin for storage;

[0040] 2) Send the stored dewatered sludge (with a moisture content of 70-85wt%) into the preheating system to preheat to 150°C;

[0041] 3) The preheated dewatered sludge is sent to the hydrothermal reactor for heat treatment to obtain the hydrothermal cracking liquid. The heating temperature in the hydrothermal reactor is 250°C, the heating time is 60 min, and the autogenous pressure is 5 MPa;

[0042] 4) Return the hydrothermal cracking liquid obtained in the previous step to the heating pipeline in the preheating system for preheating the dewatered sludge. The heating pipeline is multi-section, and a back pressure is installed between each two heating pipelines. Valve, after the hydrothermal cracking liquid is discharged from the last section of heating pipeline, the temperature is lowered to below 85°C, and gaseous products are obtained at the same time; ...

Embodiment 3

[0047] 1) Dewater the sludge from the sewage treatment plant and send it to the sludge pre-storage bin for storage;

[0048] 2) Send the stored dewatered sludge (water content 70-85wt%) into the preheating system to preheat to 150°C;

[0049] 3) The preheated dewatered sludge is sent to the hydrothermal reactor for heat treatment to obtain the hydrothermal cracking liquid. The heating temperature in the hydrothermal reactor is 300°C, the heating time is 30min, and the autogenous pressure is 10MPa;

[0050] 4) Return the hydrothermal cracking liquid obtained in the previous step to the heating pipeline in the preheating system for preheating the dewatered sludge. The heating pipeline is multi-section, and a back pressure is installed between each two heating pipelines. Valve, after the hydrothermal cracking liquid is discharged from the last section of the heating pipeline, the temperature is lowered to below 85°C, and the gaseous product is obtained at the same time;

[0051] 5...

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Abstract

The invention discloses a sludge biological carbonizing technology based on hydrothermal reaction. The sludge biological carbonizing technology comprises the steps as follows: 1) dewatering the sludge, and transferring the sludge into a sludge pre-storage bin to be stored; 2) preheating the dewatered sludge; 3) transferring the preheated dewatered sludge into a hydrothermal reactor, thus obtaining hydrothermal lysis solution; 4) returning the hydrothermal lysis solution into a preheating system to preheat the dewatered sludge, and cooling the hydrothermal lysis solution so as to obtain a gaseous product; 5) transferring the cooled hydrothermal lysis solution into a filter press for filter pressing, thus obtaining a reacting filtrate and a solid product; 6) drying the solid product produced in previous step, and then transferring the solid product into a dry type carbonizing furnace to be carbonized, so as to obtain the solid biological carbon and other products, and transferring the other products into a gas-liquid separating device to be separated so as to obtain combustible gas and tar; and 7) transferring the gaseous product obtained in step 4) and the combustible gas and tar obtained in step 6) into a firebox to be burnt so as to generate heat; and supplying the generated heat to a hydrothermal reactor and the dry type carbonizing furnace. With the adoption of the sludge biological carbonizing technology disclosed by the invention, the product with high additional value can be obtained; and meanwhile, the energy can be saved.

Description

technical field [0001] The invention relates to a sludge biological carbonization process based on hydrothermal reaction. Background technique [0002] Sludge carbonization is a new type of sludge treatment technology. At present, there are two methods of sludge carbonization: dry carbonization and wet carbonization. [0003] Dry carbonization: This method is to dry the sludge until the water content is less than 30%, and then pyrolyze the organic matter of the sludge under anoxic conditions to make it carbonized. The dry carbonization process can be summarized as "sludge drying + dry distillation technology". Before carbonization, it needs to spend a lot of energy to directly heat and dry the sludge to reduce the moisture content to a certain level. Therefore, the main focus of the current dry carbonization process is how to improve heat utilization and energy efficiency. For example, the patent application No. 201210002712.8 uses combustible gas and flue gas generated du...

Claims

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Application Information

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IPC IPC(8): C02F11/18C02F11/12C10B53/00C10L5/46
CPCY02E50/30Y02E50/10
Inventor 王定美周顺桂徐荣险余震
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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