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Method for coprocessing sludge with high moisture content by novel dry-process rotary kiln

A high moisture content, co-processing technology, applied in the direction of combustion method, combustion type, incinerator, etc., can solve the problems of high pollution of drying exhaust gas, high energy consumption, large investment, etc., and achieve simple and easy process and ensure stability The effect of operation and small investment

Inactive Publication Date: 2010-11-17
尹小林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the investment of drying is large, the energy consumption of drying operation is high, and the treatment of drying waste gas is very difficult. The watery sludge drying lines built in Zhejiang and Guangdong have caused a lot of pollution due to the excessive pollution of drying waste gas. Residents within dozens of kilometers clashed and stopped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: In a factory with a φ4×60m kiln with a D-D decomposition furnace, the water content of the municipal water treatment sludge for the test is 80% to 83%, and the calorific value of the sludge on a dry basis is 3600~4200×4.18KJ / kg, using plunger pump pressure Sludge is injected, 0.6MPa compressed air is sprayed from the kiln tail smoke chamber with a self-made spiral nozzle, the amount of sludge injected is 4.0t / h, the amount of raw meal is 162t / h, and the water brought in is about the amount of raw meal 2%, the calciner pulverized coal combustion is normal, the preheater is not sticky, the clinker heat consumption is reduced by about 1%, the strength test has no abnormal fluctuations, and the exhaust gas test is normal.

Embodiment 2

[0017] Example 2: A factory with a φ3×48m kiln belt improved D-D decomposition furnace, the water content of the municipal water treatment sludge for the test is 79% to 85%, the dry basis calorific value of the sludge is 2750~3800×4.18KJ / kg, and the plunger is used The pump presses the sludge, 0.5MPa compressed air, self-made spiral nozzle, and sprays it in from the calciner. When the amount of sludge injected is 2.7t / h, the amount of raw meal is 78t / h, and the water brought in accounts for about 100% of the amount of raw meal. 2.9 percent. The pulverized coal combustion of the calciner is normal, the preheater has no obvious sticking and clogging, the clinker heat consumption and strength detection are normal, and the exhaust gas detection is normal.

Embodiment 3

[0018] Example 3: In a factory with a φ4.2×64m kiln and a pipeline-type decomposition furnace, the water content of the municipal water treatment sludge for the test is 80% to 84%, and the calorific value of the sludge on a dry basis is 3800~4100×4.18KJ / kg. Continuously add about 8% of wet calcium carbide slag, about 5% of coarse coal ash, and about 2% of rice husk into the mud and continuously stir, pump into the plate and frame filter press with 1.0MPa compressed air to filter, and the water content of the filter residue is 30% to 34%. The filter residue is mechanically fed into the kiln tail smoke chamber, impulsively with an air cannon, the feed rate of filter residue is 17t / h, and the feed rate of raw meal is 193t / h. There is no abnormal fluctuation in the firing heat consumption and clinker physical inspection indicators, and the exhaust gas detection is normal.

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Abstract

The invention discloses a method for coprocessing sludge with high moisture content by a novel dry-process rotary kiln. Sludge with high moisture content is transported into a kiln tail smoke chamber or a decomposing furnace to be burnt out without being dried and grinded; when the amount of sludge required to process is small, coal property is favourably decomposed, the combustion state of pulverized coal in the decomposing furnace is excellent, and the sludge with high moisture content is atomized by a pump and is ejected into the kiln tail smoke chamber or the decomposing furnace to be burnt out or mechanically sent into the kiln tail smoke chamber to be burnt out; when the amount of sludge required to process is big or the combustion state of pulverized coal in the decomposing furnace is poor, regulating components are added into the sludge with high moisture content, the sludge with high moisture content is subjected to filter-pressing or stockpile and drainage to be sent into the kiln tail smoke chamber or the decomposing furnace to be burnt out, or the sludge, the broken town household garbage and the like are mixed and milled to be sent into the kiln tail smoke chamber or the decomposing furnace to be burnt out together; and the moisture content introduced by the sludge is not more than 3% of raw material inventory. On the premise of keeping the production stability of the dry-process rotary kiln and keeping clinker sintering energy consumption and quality, the invention can harmlessly process sludge with high moisture content in the mode of energy and reclamation.

Description

Technical field: [0001] The invention relates to an environmentally friendly waste treatment method for sludge with high water content, in particular to a method for co-processing sludge with high water content in the production of a new type of dry-process rotary kiln, which is used to solve the problem of energy saving in cement production. Harmful, resourceful, and energy efficient treatment of environmental pollution from sludge with high water content. Background technique: [0002] Sludge with high water content, such as municipal water treatment sludge and printing and dyeing plant sludge, usually has a water content of 75% to 85%. In addition to a certain amount of inorganic matter, it also contains a large amount of organic matter and pathogenic microorganisms or toxic substances. Hazardous treatment is difficult. The most advanced method at present is drying, especially using waste heat from power plants or waste heat from cement plants as alternative fuels. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00
Inventor 尹小林
Owner 尹小林
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