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Method for resource utilization of water-containing sludge

A water-sludge and resource-recycling technology, applied in cement production and other directions, can solve the problems of low drying efficiency, heat consumption, increased cost, etc. Effect

Inactive Publication Date: 2013-11-20
尹无忌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding a set of special drying equipment, using the waste heat of the grate cooler of the cement kiln to dry the sludge and then process it, however, it is actually difficult to dry the water-containing sludge with a flocculated water-retaining structure, and the drying efficiency is low
[0005] The second type is to add water-containing sludge directly into the cement kiln, that is, directly add water-containing sludge to the grate cooler or kiln tail smoke chamber or decomposition furnace or kiln connecting pipe. Due to the high moisture content of the water-containing sludge, It will seriously affect the normal operation of the kiln
[0010] Furthermore, the ammonia water and urea denitrification methods commonly used in dry-process cement production lines not only consume heat and increase costs, but also compete with agriculture for fertilizer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a Φ3.0×47m dry-process cement production line, the raw material section adopts stacking forklift homogenization, forklift grabbing and transporting materials, silo batching, and vertical mill grinding processes. The raw material is made of limestone, clay, sandstone and sulfuric acid slag, and the output of the raw material vertical mill is about 90t / h. It turns out that about 6 tons of water is sprayed per hour in the vertical mill; 17% ammonia water is used for denitrification in the calciner of the cement kiln system, and about 200 kg of ammonia water is used per hour.

[0032] The test used the aged sludge stored in the open air of the sewage treatment plant. The average moisture content of the aged sludge was 37.3% (weight), and the sludge was transported to the shed in the factory by car. After sampling, testing, analysis and evaluation in the laboratory, clay is removed from the raw material ingredients, and aged sludge with a weight ratio of 20% is added.

...

Embodiment 2

[0035]Φ3.5×52m dry-process cement production line, the raw material ingredients are limestone, shale, phosphorous slag, steel slag four-component batching, the limestone uses two grades of crushed stone in the limestone shed with a forklift homogenization, phosphorous The slag and steel slag are evenly matched with a forklift in the shed. The output of raw meal vertical mill is about 120 tons. It turns out that when the climate is dry, the water spray in the vertical mill is about 9 tons per hour. The calciner of the cement kiln system uses 17.5% ammonia water for denitrification, and consumes about 220kg of ammonia water per hour.

[0036] The biochemical sludge from the sewage treatment plant was used in the test, with an average moisture content of 85.3%, and was transported to the plant by tanker. After laboratory testing, analysis and evaluation, it is planned to mix the sludge with a weight ratio of 6% of the raw meal. The sludge in the tanker is directly sprinkled on ...

Embodiment 3

[0038] Φ4.3×64m dry-process cement production line, the raw materials are made of limestone, sandstone, coal ash and sulfuric acid slag. The output of raw meal vertical mill is about 250 tons. It turned out that the water spray volume of the automatic adjustment system for water spray humidification in the vertical mill fluctuated at about 9 to 17 tons per hour. The calciner of the cement kiln system uses 17.5% ammonia water for denitrification, and the ammonia water consumption is about 330kg per hour.

[0039] The test uses sludge digested from a sewage treatment plant with an average moisture content of 86.7%. It is transported to the plant by tank truck and pumped into the sludge tank. After laboratory testing, analysis and evaluation, it is planned to mix the sludge with a weight ratio of 13% of the raw meal. The sludge in the mud tank is transported by a mud pump, evenly spread on the limestone layer on the conveying belt of the raw meal batching system, and other batch...

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Abstract

The invention discloses a method for resource utilization of water-containing sludge. At a section from a raw material shed or a raw material warehouse to a raw material vertical milling area in a dry-method cement production line, water-containing sludge is mixed into raw material or put in a vertical mill, so as to adjust the comprehensive water content and the material plasticity of raw materials and the vertically milled material of the raw material to 3wt% to 15wt%; and the sludge-containing raw material powder which is prepared from the vertically milled raw material is fed into a cement kiln system so as to be calcined into cement clinker. According to the method, based on such natural characteristics of water-containing sludge as high water content, the flocculence structure, the plasticviscosity, water content and plasticity required by the vertically milled material can be provided, the application requirements of the raw material vertical mill are met, the purpose of resource utilization of the water-containing sludge is reached, the method is simple, feasible, practical and low in investment, the harmless treatment of water-containing sludge is realized, the investment in technical transformation of the method is small, the utilization amount of the sludge is large, and good benefits and optimal economy are achieved.

Description

technical field [0001] The invention relates to a sludge treatment and utilization method, in particular to a resource utilization method of hydrous sludge on a dry process cement production line. Background technique [0002] In addition to some clay-like inorganic substances, aqueous sludge also contains organic matter, pathogenic microorganisms, or toxic and harmful substances. Due to its high water content and flocculated water-retaining structure, it is extremely difficult to harmlessly treat it, and it is even more difficult to directly implement resource utilization. [0003] At present, in addition to landfill, composting, ceramsite making, etc., the world's advanced water sludge treatment technologies are roughly divided into two categories. [0004] The first category is to use the waste heat of thermal power or the waste heat of cement kiln exhaust gas to set up a special sludge drying equipment system to dry the water-containing sludge as an alternative fuel. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/38
CPCY02P40/10
Inventor 尹小林尹无忌
Owner 尹无忌
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