Steam heat pipe drying method and system for sewage sludge

A sewage sludge and heat pipe technology, applied in dehydration/drying/concentrated sludge treatment, chemical instruments and methods, separation of dispersed particles, etc., to achieve the effects of continuous operation, odor removal, and simplified treatment process

Active Publication Date: 2014-04-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]1. The high water content of sludge makes the drying process require a lot of energy and high cost;
[0005]2. Due to the bonding of the heating surface during the sludge drying process, the drying effect is not ideal;
[0006]3. The sludge drying process will also produce stench, etc., which will pollute the surrounding environment
[0007] The disorderly stacking and unreasonable treatment of sludge not only takes up a lot of land, but also pollutes land and water bodies, and is prone to corruption, resulting in stench and air pollution

Method used

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  • Steam heat pipe drying method and system for sewage sludge

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Effect test

Embodiment

[0023] see figure 1 Shown, a kind of sewage sludge steam heat pipe type drying method comprises the following steps:

[0024] Step 1: Use waste heat flue gas and other low-grade external heat sources 17 to heat the closed barrel steam generator 1 to generate steam, and the deionized water 2 is heated to generate steam and move upward. The heating temperature is 150-200°C and the air pressure is 0.48-1.55Mpa ;

[0025] Step 2: The steam generated by heating rises and contacts the wall of the drier 9 to dry the sludge in the drier 9;

[0026] Step 3: After being cooled, the steam descends back to the bottom of the steam generator 1 and is reheated. This process forms a heat pipe-type working fluid internal circulation.

[0027] The sludge in the above step 2 enters the dryer 9 from the sludge bin 7, and is stirred and mixed by a plow-shaped agitator 18 to realize sludge mixing and moving down to enhance uniform drying; the dried sludge is discharged through the outlet 16 at t...

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Abstract

The invention discloses a steam heat pipe drying system for sewage sludge, which comprises a steam generator, the bottom of the steam generator is provided with the external heat source; deionized water is pumped into the steam generator from the lower portion of the steam generator; the steam generator above the deionized water is provided with the drying apparatus; the upper end of the drying apparatus is connected with a sludge bin; the drying apparatus is provided with a stirrer; the bottom of the drying apparatus is connected with an outlet of the dried sludge; the other side of the upper end of the drying apparatus is connected with a spraying cooling tower through pipes; the top of the spraying cooling tower is provided with a spraying opening; the bottom of the spraying cooling tower is provided with a wastewater outlet; and the praying cooling tower is connected with an exhaust purifier.

Description

technical field [0001] The invention relates to a new method for cleaning and drying sewage sludge, in particular to a sludge steam high-efficiency drying system with simple structure, easy operation and continuous and stable operation. Background technique [0002] According to the "China Statistical Yearbook", in 2010, the amount of urban domestic sewage generated was 37.98 billion cubic meters, and the annual discharge of industrial sewage also reached 23.75 billion cubic meters. Sludge is the solid sediment produced during sewage treatment. The water content of raw sewage sludge can reach 99%, and the main components of mechanically dewatered sludge are about 80% water, 10% organic matter and 10% ash. Every year, the wet sludge produced by my country's sewage treatment can reach more than 60 million tons (85% moisture content). Sludge contains a large amount of harmful substances, such as heavy metals, bacteria, various parasite eggs, a large number of pathogenic micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12B01D53/85B01D53/14
CPCY02A50/20
Inventor 袁浩然严密陈勇黄宏宇
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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