CN104609685A - Method for co-treating anaerobic digested sludge via cement kiln - Google Patents

Method for co-treating anaerobic digested sludge via cement kiln Download PDF

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Publication number
CN104609685A
CN104609685A CN201510044691.XA CN201510044691A CN104609685A CN 104609685 A CN104609685 A CN 104609685A CN 201510044691 A CN201510044691 A CN 201510044691A CN 104609685 A CN104609685 A CN 104609685A
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China
Prior art keywords
raw material
digested sludge
cement
sludge
grinding mill
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CN201510044691.XA
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CN104609685B (en
Inventor
董金庆
津田稔
刘程
赵凯
张秀彬
余立中
时云山
郑朋吉
徐贻成
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DALIAN DONGTAI ORGANIC WASTE TREATMENT Co Ltd
Dalian Xiaoyetian Cement Co Ltd
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DALIAN DONGTAI ORGANIC WASTE TREATMENT Co Ltd
Dalian Xiaoyetian Cement Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention provides a method for co-treating anaerobic digested sludge via a cement kiln. The method comprises the following steps: carrying out anaerobic treatment on sludge to obtain digested sludge, feeding from a raw material grinding mill, grinding and drying the sludge in the raw material grinding mill, collecting the sludge by a bag type dust collector, homogenizing the sludge in a raw material homogenization silo as a cement raw material, conveying the cement raw material into a rotary kiln via a pre-decomposition system, and burning the cement raw material to prepare cement; the raw material grinding mill is further connected with a conditioning tower, and the other end of the conditioning tower is connected with the pre-decomposition system. The method provided by the invention is used for achieving the resource utilization of the sludge and drying the sludge in the raw material grinding mill through hot air at the kiln tail so as to save equipment and energy, and the drying moisture can be applied to the conditioning tower to save water. The method provided by the invention needs no residue or tail gas treatment and is an environmentally friendly method.

Description

The method of cement kiln synergic processing anaerobically digested sludge
Technical field
The present invention relates to refuse reclamation field, be specifically related to a kind of method of cement kiln synergic processing anaerobically digested sludge.
Background technology
City sewage and sludge has that water ratio is high, volume is large, easily corruption, cacodorous feature, also concentrate the nutrition such as a large amount of organism, abundant nitrogen, phosphorus, heavy metal compound, toxic compounds, sterilant and a large amount of pathogenic agent and parasitic ovum etc. simultaneously, if suitably do not subtract appearance, stable or recycling treatment, easily cause large-scale secondary pollution.City sewage and sludge is the digested decomposition of organism in mud after Anaerobic Digestion, can make sludge stabilizing, makes it not easily corrupt.In addition, by anaerobic digestion, most of pathogenic bacteria or roundworm egg are killed or are decomposed as organism, make sewage sludge harmlessness.Current digested sludge is on a small quantity as afforestation Nutrition Soil, but as the problem that the existence of greening soil uses and demand is limited, so major part needs to carry out landfill disposal, not only occupy the limited storage capacity of landfill yard in a large number, also can produce a series of environmental protection and social concern.
The water ratio about 70% of digested sludge, compare water ratio compared with the city sewage and sludge of 85-90% moisture to decrease, but the water ratio of 70% is still very high, and this part water mostly is water in cell, be difficult to physical sepn, which increase the difficulty of digested sludge subsequent disposal.Decomposable asymmetric choice net in mud, perishableization amount of material reduce, and bacterium, pathogenic micro-organism, parasitic ovum are killed, and make mud sanitisation, stabilization, but still lingering section methanogen, soil ulmin and organic acid etc. in digested sludge.Mud is at anaerobic digestion process, and hydrogen sulfide is isolated sulfur molecule or is combined into iron sulphide with iron, and therefore postdigestive mud can not give out a foul smell again.The processing mode of current digested sludge is landfill and Land_use change, but this does not all make digested sludge obtain final harmless treatment.The processing mode of current digested sludge is landfill and Land_use change, but this does not all make digested sludge obtain final harmless treatment.Therefore digested sludge enters landfill yard landfill is not long-term plan, needs to seek effective means more and makes digested sludge obtain final harmless treatment.
Cement kiln synergic processing digested sludge is the one of recycling sludge, the digested sludge stable in properties that mud produces after anaerobic digestion, organic content is low, can be added at the feed circuit of manufacture of cement by cement kiln synergic processing technology, namely the problem of digested sludge process in anaerobic digestion techniques is solved, digested sludge decrement is made to be zero, not only landfill cost and land resources can be saved, but also resource can be made to obtain recycle, turn waste into wealth, obtain " minimizing, innoxious, the resource utilization " that make digested sludge real processes.
Summary of the invention
For solving the anaerobically digested sludge process difficult problem existed in prior art, the invention provides a kind of method of cement kiln synergic processing anaerobically digested sludge, namely the problem of digested sludge process in anaerobic digestion techniques is solved, digested sludge decrement is made to be zero, not only landfill cost and land resources can be saved, but also resource can be made to obtain recycle, turn waste into wealth.
Technical scheme of the present invention 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 and cement raw material are added in raw material grinding mill (3) and mix, through grinding and mummification in raw material grinding mill (3), raw material homogenizing silo (5) homogenizing is entered after bag collector (4) is collected, enter rotary kiln (7) by precalcining system (6) again to carry out burning and prepare cement, described raw material grinding mill (3) also connects conditioning tower (10), and conditioning tower (10) the 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, and all can mix with digested sludge and jointly prepare cement as raw material, as Wingdale, clay, powdered iron ore and shale etc., the feeding quantity of described digested sludge is 1 ~ 5%.
Further, step 2. described in mummification utilizes is kiln tail hot blast, described kiln tail hot blast by precalcining system by the incoming stock mill of conditioning tower.
In in rotary kiln, temperature is generally between 1350 DEG C-1650 DEG C, even higher, combustion gases, at this residence time > 8s, higher than residence time > 3s when 1100 DEG C, restrained effectively the formation of dioxin precursor.The total residence time of combustion gases is about 20s, and material is high turbulization state in kiln, therefore in the digested sludge in kiln, harmful organic substance can Thorough combustion, burning ratio can reach 99.9999%, even stable organism also can be completely broken down as dioxin etc., the practice disposing poisonous waste from domestic and international cement kiln shows, produces dioxin emission concentration far below emission limit after castoff burning.
In the technique of carrying out cement kiln synergic processing mud, mud generally adds at firing system, and moisture a large amount of in mud directly enters kiln burning and kiln tail oxygen concentration can be caused to reduce, and system temperature reduces, thus cause the problem such as the grog underproduction and hear rate rising, processing cost is increased.The method of cooperative disposal digested sludge of the present invention, select to add digested sludge at feed circuit, avoid and add at firing system the problem such as the grog underproduction and hear rate rising caused, and can first utilize kiln tail gas to carry out mummification to mud, reenter precalcining system and rotary kiln incineration, so namely, the stability of firing system can not be affected, mud also can be made to obtain recycling treatment.
Another technical purpose of the present invention is to provide the cement utilizing the method for cement kiln synergic processing digested sludge of the present invention to prepare.
Beneficial effect:
(1) mud after anaerobic digestion is carried out recycling by the present invention, realizes turning waste into wealth;
(2) anaerobically digested sludge is directly passed through raw material grinding mill charging by the present invention, loose to the water content requirement of mud raw material, mud is without the need to carrying out mummification in addition, in raw material grinding mill, kiln tail hot blast directly can be utilized to carry out mummification, solve in prior art the step needing multistage mummification, save equipment, again save the energy;
(3) Raw of the present invention grinds direct-connected conditioning tower, and digested sludge can direct mummification in raw material grinding mill, and the aproll in the alternative raw material grinding mill of its moisture, has saved the water consumption of raw material grinding mill;
(4) calcining combustion gas dust reenters in kiln as cement raw material and calcines after kiln tail bagroom is collected, the waste flying dust that is safe from danger produces, inorganic component in mud is all cured in grog lattice in calcination process, final product is cement products, can not produce the residual residue needing secondary treatment;
(5) mud through anaerobic digestion stabilization of the present invention's utilization, harmful substance contents is low, and drying tail gas need not process, and directly discharge can be up to standard.
Accompanying drawing explanation
Fig. 1. cement kiln synergic processing anaerobically digested sludge schema of the present invention;
Wherein, 1. digested sludge storage pool, 2. spiral 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.
Embodiment
Following non-limiting example can make the present invention of those of ordinary skill in the art's comprehend, but does not limit the present invention in any way.
Embodiment 1
Utilize cement kiln synergic processing anaerobically digested sludge as shown in Figure 1: first mud is carried out Anaerobic Digestion, the water content of digested sludge is 70%, digested sludge sends into raw material grinding mill 3 by digested sludge storage pool 1 by spiral pump 2, Wingdale, the cement raw materials such as shale also add in raw material grinding mill 3 and mix with it, the addition of digested sludge is 3%, in raw material grinding mill 3, each material is through grinding and drying and other treatment, raw material homogenizing silo 5 is entered after bag collector 4 is collected, send into precalcining system 6 after homogenizing and carry out pre-thermolysis, enter rotary kiln 7 again to carry out burning and prepare cement, enter cooler 8 subsequently successively and who knows storehouse 9, cement products can be obtained.Raw material grinding mill 3 is also connected with conditioning tower 10, and the other end of conditioning tower 10 connects precalcining system 6.
In System Operation process, the kiln tail hot blast in rotary kiln 7 is successively by precalcining system 6, the incoming stock mill 3 of conditioning tower 10, and in order to mummification digested sludge, kiln tail hot blast is by being discharged by chimney 11 after bag collector 4, without the need to process, in line up to standard.
Owing to needing aproll when raw material grinding mill operates, it directly can utilize the moisture of mummification digested sludge in raw material grinding mill, decreases 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 and cement raw material are added in raw material grinding mill (3) and mix, through grinding and mummification in raw material grinding mill (3), raw material homogenizing silo (5) homogenizing is entered after bag collector (4) is collected, enter rotary kiln (7) by precalcining system (6) again to carry out burning and prepare cement, described raw material grinding mill (3) also connects conditioning tower (10), and conditioning tower (10) the other end is connected with precalcining system (6).
2. the method for cement kiln synergic processing digested sludge according to claim 1, is characterized in that: step 2. described in the water content of digested sludge be 68 ~ 70%.
3. the method for cement kiln synergic processing digested sludge according to claim 1, is characterized in that: the feeding quantity of described digested sludge is 1% ~ 5%.
4. the method for cement kiln synergic processing digested sludge according to claim 1, is characterized in that: step 2. described in mummification utilizes is kiln tail hot blast, described kiln tail hot blast by precalcining system by the incoming stock mill of conditioning tower.
5. the cement prepared by the method described in Claims 1 to 4 any one.
CN201510044691.XA 2015-01-28 2015-01-28 The method of cement kiln synergic processing anaerobically digested sludge Active CN104609685B (en)

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Cited By (1)

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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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