Three-stage dioxin emission reduction method in process of firing municipal sludge to prepare ceramsite

A municipal sludge, three-stage technology, applied in separation methods, dispersed particle filtration, chemical instruments and methods, etc., can solve problems such as control and treatment of dioxin pollutants that are not mentioned, and achieve dioxin emission reduction methods. Simple and practical, suppress the generation of dioxin, and realize the effect of low-cost emission reduction control

Inactive Publication Date: 2014-07-23
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, patent CN102701711A and patent CN102060560A respectively provide methods for sintering bricks and preparing ceramsite using municipal sludge as raw materials, but neither of them mentions the control and treatment of dioxin pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The dehydrated municipal sewage treatment plant municipal sludge and other ingredients are added to the mixing tank according to the formula, in which ammonium sulfate is 0.03% of the total mass, stirred and mixed for 30 minutes to homogenize the materials, and the evenly mixed materials are sent to into the granulator, the particle size is controlled between 6mm, and the temperature gradient is 150°C-650°C, the pellets are sent into the rotary kiln, and the fuel oil is sprayed into the pellets by the fuel injection machine to fully burn the pellets. The high-temperature sintering temperature is 1050° C., and the time is 30 minutes. The temperature of the flue gas in the rotary kiln is controlled above 1000°C, and the residence time of the flue gas is more than 2s, so that the flue gas is fully stirred, and the flue gas outlet of the rotary kiln is O 2 Content 6-10%, CO3 , the concentration of dioxin is less than 0.1 ngTEQ / m 3 . The ceramsite is output through the out...

Embodiment 2

[0028] After dehydration, the sludge from the sewage treatment workshop of the printing and dyeing factory and other ingredients are added to the mixing tank according to the formula, and the auxiliary material ammonium chloride is 0.05% of the total mass. Stir and mix for 30 minutes to homogenize the materials. Send it into the granulator, the particle size is controlled between 6mm, the temperature gradient is 150°C-650°C, the pellets are sent into the rotary kiln, and the fuel oil is sprayed into the pellets through the fuel injection machine to fully burn the pellets. The high-temperature sintering temperature is 1050° C., and the time is 30 minutes. The temperature of the flue gas in the rotary kiln is controlled above 1000°C, and the residence time of the flue gas is more than 2s, so that the flue gas is fully stirred, and the flue gas outlet of the rotary kiln is O 2 Content 6-10%, COg / Nm 3 , the dioxin concentration is less than 0.1n g TEQ / m 3 . The ceramsite is o...

Embodiment 3

[0030]The dehydrated river sludge and other ingredients are added to the mixing tank according to the formula, and the auxiliary material ammonium bicarbonate is 0.06% of the total mass. Stir and mix for 30 minutes to homogenize the materials, and send the uniformly mixed materials into granulation In the machine, the particle size is controlled between 6mm and the temperature gradient is 150°C-650°C. The pellets are sent into the rotary kiln, and the fuel oil is sprayed into the pellets through the fuel injection machine to fully burn the pellets and carry out high temperature sintering. to 1050°C for 30 minutes. The temperature of the flue gas in the rotary kiln is controlled above 1000°C, and the residence time of the flue gas is more than 2s, so that the flue gas is fully stirred, and the flue gas outlet of the rotary kiln is O 2 Content 6-10%, COg / Nm 3 , the dioxin concentration is less than 0.1n g TEQ / m 3 . The ceramsite is output through the outlet pipeline, and is...

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Abstract

The invention discloses a three-stage dioxin emission reduction method in a process of firing municipal sludge to prepare ceramsite, namely a three-stage emission reduction method including source prevention and control, control in a sintering process and tail end treatment of dioxin generated in the process of firing municipal sludge to prepare ceramsite. According to the method, a certain amount of an ammonium salt assistant is added at the source; a quench tower is additionally arranged in the sintering process; a dry type desulfurizing tower and a bag deduster are used together in tail end control. When dioxin is effectively removed, NOx, SO2, heavy metals and compounds of heavy metals can be further removed. Concentration of dioxin in outlet smoke is lower than 0.1ngTET/<m3>. The three-stage dioxin emission reduction method provided by the invention is high in practicality and simple to operate, and low-cost emission reduction control of dioxin can be effectively realized.

Description

1. Technical field [0001] The invention relates to the field of environmental protection, in particular to a dioxin emission reduction method in the process of firing ceramsite from municipal sludge. 2. Technical Background [0002] Municipal sludge mainly includes sludge from waterworks, residual sludge from municipal sewage treatment plants, sludge from urban drainage pipes, etc. It is an extremely complex heterogeneous body composed of organic debris, inorganic particles, colloids, etc. It is rich in Contains microorganisms, pathogens, viruses, etc., and has a high content of chloride ions. According to "Chemosphere" 2007 No. 68, page 1751, it is pointed out that the total mass fraction of chlorobenzene in the sludge of urban sewage treatment plants in China is as high as 6.9mg / kg. Chlorobenzene is the main precursor for the reaction to generate dioxins. The chlorine-containing compounds in municipal sludge cause a large amount of dioxins to be discharged into the atmos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/32B01D53/00B01D53/06B01D46/02B01D53/81B01D53/60B01D53/64B01D53/70
CPCY02A50/20Y02P40/60
Inventor 张文艺吴凌云戴如娟刘芳
Owner CHANGZHOU UNIV
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