CN104609685B - The method of cement kiln synergic processing anaerobically digested sludge - Google Patents
The method of cement kiln synergic processing anaerobically digested sludge Download PDFInfo
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- CN104609685B CN104609685B CN201510044691.XA CN201510044691A CN104609685B CN 104609685 B CN104609685 B CN 104609685B CN 201510044691 A CN201510044691 A CN 201510044691A CN 104609685 B CN104609685 B CN 104609685B
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- digested sludge
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- mud
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The method of cement kiln synergic processing digested sludge, mud is carried out anaerobic treatment, obtain digested sludge, feed from raw material grinding mill, through grinding mummification in raw material grinding mill, after bag collector is collected, enter raw material homogenizing silo homogenizing as cement raw material, then carry out burning prepare cement by precalcining system entrance rotary kiln, described raw material grinding mill is also connected with conditioning Tower, and the conditioning Tower other end is connected with precalcining system.The method of the present invention realizes the recycling of mud, and available kiln tail hot blast carries out mummification to mud in raw material grinding mill, saves equipment and the energy, and its mummification moisture can be used for conditioning Tower, reduces water consumption.The method of the present invention, without carrying out residue and vent gas treatment, is environmentally friendly method.
Description
Technical field
The present invention relates to refuse reclamation field, be specifically related to a kind of cement kiln synergic processing anaerobically digested sludge
Method.
Background technology
City sewage and sludge has that moisture content is high, volume greatly, feature the most corrupt, cacodorous, the denseest
Crouch nutrient, heavy metal compound, the toxic compounds such as substantial amounts of Organic substance, abundant nitrogen, phosphorus, kill
Worm agent and a large amount of pathogen and parasitic ovum etc., if not carrying out suitable volume reduction, stable or recycling treatment, easily
Cause large-scale secondary pollution.City sewage and sludge after Anaerobic Digestion in mud Organic substance disappeared
Change and decompose, sludge stabilizing can be made, be allowed to be difficult to corruption.It addition, by anaerobic digestion, major part cause of disease
Bacterium or roundworm egg are killed or are decomposed as Organic substance, make sewage sludge harmlessness.Digested sludge at present is a small amount of
As afforestation Nutrition Soil, but as afforesting the problem that soil existence uses and demand is limited, so big portion
Divide and need to carry out landfill disposal, occupy the limited storage capacity of landfill yard the most in a large number, also can produce a series of ring
Protect and social problem.
The moisture content about 70% of digested sludge, the city sewage and sludge of relatively 85-90% moisture compares moisture content to be had
Reduced, but the moisture content of 70% is the highest, and this part water mostly is intracellular water, it is difficult to physics is divided
From, which increase the difficulty of digested sludge subsequent treatment.In mud, decomposable asymmetric choice net, easy septage prime number amount reduce,
Antibacterial, pathogenic microorganism, parasitic ovum are killed, and make mud hygienization, stabilisation, but in digested sludge
Still residual fraction methanogen, humus and organic acid etc..Mud is in anaerobic digestion process, sulfuration
Hydrogen is isolated sulfur molecule or is combined into iron sulfide with ferrum, and the most postdigestive mud will not give out a foul smell again.
The processing mode of digested sludge at present is landfill and Land_use change, but this does not the most make digested sludge obtain
Whole harmless treatment.The processing mode of digested sludge at present is landfill and Land_use change, but this does not the most make
Digested sludge obtains final harmless treatment.Therefore digested sludge enters landfill yard landfill is not long-term plan,
Needing to seek significantly more efficient method makes digested sludge obtain final harmless treatment.
Cement kiln synergic processing digested sludge is the one of recycling sludge, and mud produces after anaerobic digestion
Digested sludge stable in properties, content of organics is low, can be by cement kiln synergic processing technology in manufacture of cement
Raw material system add, i.e. solve the problem that digested sludge in anaerobic digestion techniques processes, make digested sludge
Decrement is zero, is possible not only to save landfill cost and land resource, but also resource can be made to be circulated
Utilizing, turn waste into wealth, obtain " minimizing, innoxious, the resource " that make digested sludge real processes.
Summary of the invention
Processing a difficult problem for solving anaerobically digested sludge present in prior art, the present invention provides a kind of cement kiln
The method of cooperative disposal anaerobically digested sludge, i.e. solves the problem that in anaerobic digestion techniques, digested sludge processes,
Making digested sludge decrement is zero, is possible not only to save landfill cost and land resource, but also can make money
Source is recycled, and turns waste into wealth.
Technical scheme is as follows:
The method of cement kiln synergic processing digested sludge, comprises the following steps:
1. mud is carried out anaerobic treatment, obtain digested sludge；
2. described digested sludge is added in raw material grinding mill (3) with cement raw material and mix, in raw material grinding mill (3)
Through grinding and mummification, after bag collector (4) is collected, enter raw material homogenizing silo (5) homogenizing, then pass through
Precalcining system (6) entrance rotary kiln (7) carries out burning and prepares cement, and described raw material grinding mill (3) is also connected with
Conditioning Tower (10), conditioning Tower (10) other end is connected with precalcining system (6).
Further, step 2. described in the water content of digested sludge be 68～70%.
Further, described cement raw material is the conventional raw material that prior art produces cement, all can be with digestion dirt
Mud mixing prepares cement collectively as raw material, such as limestone, clay, Iron Ore Powder and shale etc., described digestion
The feeding quantity of mud is 1～5%.
Further, step 2. described in mummification utilize be kiln tail hot blast, described kiln tail hot blast is by predecomposition
System enters raw material grinding mill by conditioning Tower.
In in rotary kiln, temperature is typically between 1350 DEG C-1650 DEG C, and the highest, burning gases are at this
Time of staying ＞ 8s, time of staying ＞ 3s during higher than 1100 DEG C, restrained effectively the shape of two English precursors
Become.The total residence time of burning gases is that material is high turbulization state in about 20s, and kiln, therefore kiln
In digested sludge in harmful organic substance can fully burn, burning ratio up to 99.9999%, even stable
Organic substance such as two English etc. also can be completely broken down, and disposes the reality of poisonous waste from domestic and international cement kiln
Trampling and show, the two English concentration of emissions produced after castoff burning are far below emission limit.
In the technique carrying out cement kiln synergic processing mud, mud typically adds at firing system, in mud
Substantial amounts of moisture directly enters kiln burning and kiln tail oxygen concentration can be caused to reduce, and system temperature reduces, thus causes
The grog underproduction and heat consumption rise the problems such as high, make processing cost increase.The cooperative disposal digested sludge of the present invention
Method, selects to add digested sludge at raw material system, it is to avoid add the grog underproduction caused at firing system
And heat consumption rises the problems such as high, and first with kiln tail gas, mud can be carried out mummification, reenter predecomposition system
System and rotary kiln incineration, the most i.e. do not interfere with the stability of firing system, it is possible to so that mud obtains resource
Change processes.
Another technical purpose of the present invention is to provide the cement kiln synergic processing digested sludge utilizing the present invention
Cement prepared by method.
Beneficial effect:
(1) mud after anaerobic digestion is carried out recycling by the present invention, it is achieved turn waste into wealth；
(2) anaerobically digested sludge is directly fed by the present invention by raw material grinding mill, the moisture content of mud raw material
Asking loose, mud, without being additionally carried out mummification, can directly utilize kiln tail hot blast in raw material grinding mill and carry out mummification,
Solve the step needing multistage mummification in prior art, save equipment, save again the energy；
(3) the direct-connected conditioning Tower of raw material grinding mill in the present invention, and digested sludge can direct mummification in raw material grinding mill, its
Aproll in the alternative raw material grinding mill of moisture, has saved the water consumption of raw material grinding mill；
(4) calcining is discharged exhaust gas and dust and is reentered kiln as cement raw material after kiln tail bagroom is collected
Interior calcining, the garbage flying dust that is safe from danger produces, and the inorganic component in mud is all cured in calcination process
In grog lattice, end product is cement products, will not produce the residual residue needing after-treatment；
(5) mud through anaerobic digestion stabilisation that the present invention utilizes, harmful substance contents is low, drying tail gas
Need not process, directly discharge can be up to standard.
Accompanying drawing explanation
Fig. 1. the cement kiln synergic processing anaerobically digested sludge flow chart of the present invention；
Wherein, 1. digested sludge storage pool, 2. screw pump, 3. raw material grinding mill, 4. bag collector, 5. raw material homogenizing silo,
6. precalcining system, 7. rotary kiln, 8. cooler, 9. clinker warehouse, 10. conditioning Tower, 11. chimneys.
Detailed description of the invention
Following non-limiting example can make those of ordinary skill in the art that the present invention is more fully understood,
But limit the present invention never in any form.
Embodiment 1
Utilize cement kiln synergic processing anaerobically digested sludge as shown in Figure 1: first carried out at anaerobic digestion by mud
Reason, the water content of digested sludge is 70%, and digested sludge is sent by screw pump 2 by digested sludge storage pool 1
Entering raw material grinding mill 3, the cement raw material such as limestone, shale also adds in raw material grinding mill 3 mixed, digested sludge
Addition is 3%, and in raw material grinding mill 3, each material is through grinding and drying and other treatment, after bag collector 4 is collected
Enter raw material homogenizing silo 5, send into precalcining system 6 after homogenizing and carry out pre-thermal decomposition, enter back into rotary kiln 7 and enter
Cement is prepared in row burning, sequentially enters cooler 8 subsequently and somehow storehouse 9, i.e. can get cement products.Raw material
Mill 3 is also connected with conditioning Tower 10, and the other end of conditioning Tower 10 connects precalcining system 6.
During System Operation, the kiln tail hot blast in rotary kiln 7 passes sequentially through precalcining system 6, conditioning Tower
10 enter raw material grinding mills 3, in order to mummification digested sludge, kiln tail hot blast by after bag collector 4 by chimney 11 row
Go out, it is not necessary to process, in line up to standard.
Owing to needing aproll when raw material grinding mill operates, it can directly utilize the water of mummification digested sludge in raw material grinding mill
Point, decrease the water consumption of raw material grinding mill.
Claims (5)
1. the method for cement kiln synergic processing digested sludge, comprises the following steps:
1. mud is carried out anaerobic treatment, obtain digested sludge；
2. described digested sludge is added in raw material grinding mill (3) with cement raw material and mix, in raw material grinding mill (3)
Through grinding and mummification, after bag collector (4) is collected, enter raw material homogenizing silo (5) homogenizing, then pass through
Precalcining system (6) entrance rotary kiln (7) carries out burning and prepares cement, and described raw material grinding mill (3) is also connected with
Conditioning Tower (10), conditioning Tower (10) other end is connected with precalcining system (6).
The method of cement kiln synergic processing digested sludge the most according to claim 1, it is characterised in that:
Step 2. described in the water content of digested sludge be 68～70%.
The method of cement kiln synergic processing digested sludge the most according to claim 1, it is characterised in that:
The feeding quantity of described digested sludge is 1%～5%.
The method of cement kiln synergic processing digested sludge the most according to claim 1, it is characterised in that:
Step 2. described in mummification utilize be kiln tail hot blast, described kiln tail hot blast is passed through conditioning Tower by precalcining system
Enter raw material grinding mill.
5. the cement prepared by the method described in Claims 1 to 4 any one.
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| CN201510044691.XA CN104609685B (en) | 2015-01-28 | 2015-01-28 | The method of cement kiln synergic processing anaerobically digested sludge |
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| CN201510044691.XA CN104609685B (en) | 2015-01-28 | 2015-01-28 | The method of cement kiln synergic processing anaerobically digested sludge |
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| CN104609685B true CN104609685B (en) | 2016-09-21 |
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| CN106277689A (en) * | 2016-11-07 | 2017-01-04 | 天津壹新环保工程有限公司 | A kind of energy-efficient mud multipurpose processing equipment for recycling and method |
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| JP3551960B2 (en) * | 2001-03-09 | 2004-08-11 | 三菱マテリアル株式会社 | Treatment of soil contaminated with organic matter |
| JP2003252662A (en) * | 2002-03-05 | 2003-09-10 | Tokuyama Corp | Method for manufacturing cement |
| CN100398472C (en) * | 2005-05-12 | 2008-07-02 | 陈子庭 | Method and device of treating urban mud by using cement rotary kiln |
| CN202705200U (en) * | 2012-06-09 | 2013-01-30 | 安徽海螺建材设计研究院 | Chemical sludge treatment system |
| CN202945130U (en) * | 2012-11-29 | 2013-05-22 | 广州市越堡水泥有限公司 | Sludge treating system utilizing cement kiln |
| CN103396019A (en) * | 2013-07-25 | 2013-11-20 | 尹无忌 | Method for resource utilization of water-containing sludge |
| CN103739184B (en) * | 2014-01-22 | 2014-12-10 | 桂林理工大学 | Method for drying and direct blending combustion of domestic sludge by using dry-process cement kiln waste heat |
| CN103896505B (en) * | 2014-03-25 | 2015-07-29 | 同济大学 | A kind of method of feeding mode regulation and control of cement kiln synergic processing lime mummification municipal sludge |
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