CN103896505A - Method for adjusting and controlling feeding mode of lime-dried municipal sludge cooperatively treated with cement kiln - Google Patents
Method for adjusting and controlling feeding mode of lime-dried municipal sludge cooperatively treated with cement kiln Download PDFInfo
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- 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
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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
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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Abstract
The invention relates to a method for adjusting and controlling a feeding mode of lime-dried municipal sludge cooperatively treated with a cement kiln. The method comprises the following steps: producing cement clinker by virtue of an existing novel dry-process cement clinker production line; recycling lime-stabilized sludge; specifically, conditioning the sludge with the water content being more than 80% by using lime, drying by virtue of residual heat of flue gas until the water content of the sludge is less than 35%, directly feeding the dried sludge to a vertical mill or a predecomposition kiln to serve as substitute raw material and fuel for cement raw materials, homogenizing, and firing in a rotary kiln to obtain the cement clinker, wherein the additive amount of the lime-dried sludge is 1wt%-21wt% of the cement raw materials; feeding from a proper feeding hole according to the components of the lime sludge, and effectively adjusting and controlling the cement raw materials to keep the cement production line stable and ensure good clinker quality. According to the method, the efficiency of cooperatively treating the lime-dried sludge with the cement kiln is improved, the sludge treatment capacity is high, the secondary pollution is alleviated, the consumption of calcium carbonate in the cement raw materials can be reduced, microelements in the sludge take the effect of a mineralizing agent, and the clinker can be conveniently fired. The method can provide a reference for study on cooperative treatment of solid wastes and the like during industrial production by the cement kiln.
Description
Technical field
The invention belongs to the sludge disposal technology in resource and environment field, relate in particular to a kind of method of the regulation and control of the feeding mode at cement kiln synergic processing lime mummification municipal sludge.
Background technology
Growing along with China's level of urbanization, the quantity discharged of China's city sewage and sludge also sharply increases, and has become the important factor of restriction China Economic development.High and the complicated component of moisture percentage in sewage sludge is the important problem in sludge disposal, but the mud that only has 20% left and right has obtained harmless treatment and recycling, all the other mud of 80% are dealt carefully with, and situation is extremely severe, will bring serious secondary pollution.Stabilization is the basis of sewage sludge harmlessness and resource utilization, is also the key of sludge handling process, and lime drying process is to realize sludge stabilizing and the effective means of minimizing.Mud lime drying and other treatment also has fast dewatering decrement, sterilization, stable/curing heavy metal, improves the features such as sludge character, and therefore lime drying process is widely used in sludge from wastewater treatment plant dehydration in recent years.But utilize lime that the mud of water ratio 80% is down to 60%, its dry mud output (take dry-matter) is as entering 2.8 times of mud amount, and follow-up effective processing of lime dewatered sludge is current a faced difficult problem.At present, landfill is the important channel of processing lime dewatered sludge, but landfill is subject to the big cities such as the restriction in place, particularly Beijing, Shanghai, Guangzhou, and its strong basicity has also been brought difficulty to the processing of follow-up percolate, a large amount of calcareous wastes have also been caused simultaneously.Burning is Sludge Disposal Techniques the most thoroughly, and it is little that it also has floor space, processing speed is fast, minimizing degree is high and can recovered energy etc. outstanding advantages, but processing costs is higher, and the residue producing after burning still needs further disposal.Therefore collaborative burning important research and the developing direction of the resource utilization that becomes lime dewatered sludge, innoxious and minimizing processing.
Current, the development trend of Cement industry aspect environment protection and clean, ecology, intensive and high-quality production model, the strategy of sustainable development of following Cement industry " 401 is negative " has been proposed, progressively to green industry development.And lime dewatered sludge main chemical compositions is CaO, SiO
2, Fe
2o
3and Al
2o
3deng, close with the calcareous composition of cement raw material.See theoretically, lime dewatered sludge can be used as the alternative materials of cement slurry completely; Utilize cement kiln synergic processing mud to also have many advantages, high temperature can decompose poisonous and hazardous organism, kill bacteria simultaneously; Heavy Metals in Sludge can be cured in cement clinker, and the calorific value of mud is also utilized.Cement kiln synergic processing municipal sludge obtains general approval and application in European and American developed countries at present.This disposal options recycling sludge during " 12 " is processed the main project of disposing by China, demonstrates and promote in the whole nation.For solving the sludge treatment problem of megalopolis, cement kiln cooperatively processing sludge technology is most important.In cement kiln synergic processing lime dewatered sludge process, adding of lime mummification, has substituted the calcareous raw material in cement slurry, but its a large amount of calcareous introducings, the less stable that also makes the performance of cement clinker become.Therefore, for the sustainability of cement kiln synergic processing urban domestic sewage sludge mode, performance cement kiln is disposed the advantage of lime dewatered sludge etc., and a kind of cement kiln coordination technique of rational Optimum Regulation lime dewatered sludge becomes particularly important.
Summary of the invention
The object of the present invention is to provide a kind of method of feeding mode regulation and control of cement kiln synergic processing lime mummification municipal sludge, mud after utilizing Cement industry clinker production line to lime mummification carries out the disposal of resource utilization, adopt kiln tail high-temperature flue gas further dry to mud, moisture percentage in sewage sludge is reduced to below 35%, enter Vertical Mill or nsp kiln, prepare qualified cement clinker.
The addition content of lime dewatered sludge is controlled to 1% ~ 21%(optimum 5% ~ 15% of cement slurry weight), can guarantee the normal operation of production, the cement clinker of preparation meets the standard of industry.When exceeding after certain limit, need to regulate and control cement slurry, to guarantee burning till of cement clinker.
In above-mentioned lime dewatered sludge, also have the components such as phosphorus, sulphur, heavy metal, its content is not high, and these compositions can be used as the mineralizer that grog burns till, and is conducive to burning till of grog, these components also can well be solidified by cement clinker simultaneously, can not work the mischief to environment.
The primary technical problem that the present invention will solve is how to utilize efficiently cement kiln to carry out disposal of resources to lime dewatered sludge, and timely and effectively cement slurry is regulated and controled according to the difference of feeding mode, produce qualified cement clinker, thereby reduce the cost of Cement industry, save energy.
The method of the feeding mode regulation and control of a kind of cement kiln synergic processing lime mummification municipal sludge provided by the invention, is made up of three processes.One, the calc-alkaline that adds of mud is stablized drying process; Its two, high-temperature flue gas residual heat drying process; Its three, lime dewatered sludge adds the process of choosing and corresponding formula regulation and control from Vertical Mill or nsp kiln.Concrete steps are as follows:
(1) calc-alkaline that adds of mud is stablized drying process
Water ratio is greater than to 80% dewatered sludge and adds calcium conditioning, institute's adding medicine is industrial calcium oxide, and the volume of industrial calcium oxide is 2% ~ 20% of mud gross weight, mechanical stirring 3 ~ 10min, and the 3 ~ 7d that then banks up, obtains the Lime And Sewage Sludge that water ratio is less than 60%;
(2) drying course of high-temperature flue gas waste heat
220 ~ 280 ℃ of thermal oils of high-temperature flue gas access by introducing portion kiln tail carry out degree of depth mummification to the mud that step (1) is obtained, and the moisture of mud is dried to 0 ~ 35%, obtain lime dewatered sludge; The waste gas producing in drying course is again sent into rotary kiln and is burnt, and avoids producing secondary pollution; The unified collection of waste water producing enters Sewage treatment systems, carries out a biological disposal upon, and again carries out reuse after up to standard, thereby solved water resources;
(3) lime dewatered sludge is from the process that adds of Vertical Mill or nsp kiln
Select suitable dosing method according to the dosage of lime dewatered sludge, when lime account for mixed raw material ratio 5% ~ 10% time, need to supplement tripoli raw material, thereby guarantee that the grog of firing meets national standard (GB/T21372-2008 free calcium oxide content is less than 1.5%).
First kind of way: enter mixing belt after 1% ~ 21% lime dewatered sludge is utilized to residual heat drying together with cement slurry, entering after Vertical Mill mixing, grinding homogenizing (in raw mill charging), enter rotary system and calcine 60min at 1350 ~ 1500 ℃, then chilling, pulverizing, the levigate cement clinker that obtains; In this process according to the chemical composition of added mud and dosage, can regulate and control the proportioning of raw material, when dosage reaches after 18%, need in raw material, supplement a certain amount of tripoli raw material (such as raw materials such as domestic sludges), thereby guarantee the normal operation of manufacture of cement;
The second way: 1% ~ 12% lime dewatered sludge is directly dropped into nsp kiln (decomposing kiln charging) burning at 850-900 ℃, the raw material that mud burns after lime-ash and the preheating producing in nsp kiln are under wind effect, after mixing, homogenizing, enter rotary system, at 1350 ~ 1500 ℃, calcine 60min, then chilling, pulverizing, the levigate cement clinker that obtains; In this process, because system can not be monitored in real time to the composition in raw material, in order to guarantee the normal operation of manufacture of cement, strictly control the dosage of mud.
beneficial effect of the present invention is:
The mud that municipal wastewater treatment plant is produced, as cement raw material regeneration, has solved the problem of the outlet difficulty of municipal sludge after stabilization treatment on the one hand comparatively thoroughly, has found again on the other hand the suitable alternative materials of manufacture of cement.Adopt former, the fuel of lime dewatered sludge as the production of cement clinker, the feeding mode different according to it, regulates and controls timely and effectively to raw ingredients of cement, has guaranteed the quality of cement clinker; Reduce the energy consumption during grog is produced, saved resource, improved manufacture of cement efficiency; Efficiently solve because the caused cement kiln nsp kiln of adding of Lime And Sewage Sludge gathers dust and locate skinning, obstruction, easily cause security incident, affect cement kiln and dispose the problems such as municipal sludge.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of cement kiln synergic processing lime dewatered sludge of the present invention.
Fig. 2 is collaborative not admixture Lime And Sewage Sludge grog and the surface scan electron microscope picture thereof of technique gained of the invention process.
Fig. 3 is the collaborative technique gained admixture Lime And Sewage Sludge grog of the invention process and surface scan electron microscope picture thereof.
Embodiment
Further illustrate the present invention below by embodiment, but protection scope of the present invention is not limited to these embodiment.The present embodiment, take research lime dewatered sludge as research object, further describes the process that uses the method Lime And Sewage Sludge place of cement raw material Raw Material for Cement Production.
Shown in Figure 1.Sewage plant sludge (water ratio 80%) is first nursed one's health with lime, then utilized waste heat to dry it, then select different feeding modes and raw material to mix, send in rotary kiln and calcine, then chilling obtains cement clinker.
Sludge components complexity, ill-considered processing, will produce secondary pollution to environment.Mud that the present invention adopts is taken from Beijing Suburban sewage work, and mud carries out after belt press filtration, then stablizes conditioning through industrial CaO.When admixture difference in excess sludge add than lime mummification after, through the banking up of 7d, moisture percentage in sewage sludge all can be reduced to below 50%, then carries out oven drying at low temperature.When lime drying technique has remarkable dehydrating effect, sludge characteristics has also been produced to certain impact, the chemical composition of each mud is as shown in table 1.
The chemical composition analysis (%) of table 1 cement slurry and each mud
| Sample title | Loss on ignition | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | P 2O 5 |
| Cement slurry | 33.85 | 14.15 | 4.29 | 3.48 | 42.64 | 0.94 | 0.06 |
| Primary sludge | 65.26 | 6.09 | 3.22 | 5.74 | 6.09 | 0.98 | 6.02 |
| Lime dewatered sludge (lime 10 wt.%) | 38.05 | 3.24 | 1.82 | 3.56 | 44.74 | 1.27 | 3.24 |
In primary sludge and Lime And Sewage Sludge, main chemical compositions is also CaO as can be seen from Table 1, SiO
2, Al
2o
3and Fe
2o
3, be all that the content of lime in chemical composition essential in manufacture of cement, particularly Lime And Sewage Sludge is higher, more meet the demand of cement and lime raw material; And at present it is carried out to landfill disposal, greatly waste resource.Therefore in theory, Lime And Sewage Sludge is a kind of processing mode of resource utilization as cement slurry alternative materials.
embodiment 1:
Shown in actual technological process Fig. 1, in cement industry, harmlessness disposing Lime And Sewage Sludge dog-house mainly contains two places: the one, directly from the charging of raw mill end spout; The 2nd, from the charging of decomposing furnace (nsp kiln) spout.
the first dog-house charging
Lime dewatered sludge is carried out to the proportioning of different ratios at the first dog-house raw mill charging and cement slurry, mix, levigate in shaft kiln, make cement slurry, then, at 1400 ℃ of calcining 60min, chilling, pulverizing, ball milling obtain cement clinker.Table 2 be using lime dewatered sludge as one of cement raw material with the cement slurry burn-ability experimental result of traditional cement slurry mixed preparing.As known from Table 2, Lime And Sewage Sludge replacement part of cement traditional raw material can effectively improve the burn-ability of cement slurry.Can infer thus, can reduce the temperature that grog burns till identical working condition is next, reduce the digestion of fuel; Mud has been accomplished to resource utilization, innoxious disposal simultaneously.
The impact (1400 ℃) of table 2 Lime And Sewage Sludge volume on free calcium oxide
| Lime And Sewage Sludge addition content | 0% | 3% | 6% | 9% | 12% | 15% | 18% | 21% |
| Free calcium oxide content | 1.02% | 0.90% | 0.59% | 0.57% | 0.60% | 0.87% | 1.49 | 1.62% |
The grog of admixture Lime And Sewage Sludge is carried out to Morphology analysis result and show, brought micro-element into owing to mixing mud, can promote the generation of liquid phase, be beneficial to the carrying out of solid state reaction, improve the burn-ability of cement slurry.
As shown in Table 1, the main chemical compositions of lime dewatered sludge is similar, and just wherein component content is slightly different, infers thus, and it is also feasible utilizing the lime dewatered sludge that cement kiln synergic processing water ratio is lower.But after addition exceedes 18%, adding of mud affects burning till of grog on the contrary, will greatly affect the quality of cement clinker if can not adjust in time raw-meal ingredient.
As known from Table 2, in the time that the volume of Lime And Sewage Sludge reaches 18%, be also lime account for 5 ~ 7% in mixed raw material time, Lime And Sewage Sludge need to be in the time of the charging of the first dog-house place, and Cement Quality can not guarantee.Therefore must add 1% ~ 10% tripoli raw material (raw material such as tripoli or mud), and then cement slurry is is well regulated and controled, thereby be fired into the Portland clinker that meets national standard.The free calcium oxide result of the cement clinker burning till after regulation and control is as shown in table 3.
Table 3 is the impact on grog Free CaO after the first dog-house admixture lime dewatered sludge regulation and control
From above interpretation of result, feed intake at the first dog-house, by the real-time monitoring of system and the proportioning regulation and control to raw material end, be applicable to the processing disposal of the solid waste of mud in enormous quantities.
the second dog-house charging
When the volume of Lime And Sewage Sludge is controlled to 0% ~ 12%, from second material mouthful charging, mud burns in decomposition kiln, and the raw material of mud lime-ash and preheating mix under wind-force, and the grog Free CaO result of burning till at 1400 ℃ is as shown in table 4.
Table 4 is in the second impact of dog-house admixture lime dewatered sludge on grog Free CaO
| Lime And Sewage Sludge addition content | 0% | 2% | 3% | 6% | 9% | 12% |
| Free calcium oxide content | 1.02% | 0.67% | 0.89% | 0.60% | 0.58% | 0.62% |
As known from Table 4, at second dog-house feed control, in 0% ~ 12% scope, the grog of firing all can meet national standard (GB/T21372-2008).Now, Lime And Sewage Sludge addition content is less, can be from nsp kiln the second dog-house charging, reduce Lime And Sewage Sludge from the raw mill needed energy consumption that feeds intake, and residue after Lime And Sewage Sludge burning also can be well and raw material mixing, guarantee the equal quality of grog of firing.From interpretation of result, in the time that the second dog-house adds the solid waste such as mud, operate comparatively simple, but be only applicable to adding of a small amount of, and according to the analysis of the chemical composition to solid waste such as mud, strictly control its dosage, to guarantee the normal operation of cement producing line.
embodiment 2:
first dog-house
Lime dewatered sludge is ground to charging and cement slurry and carries out the proportioning of different ratios at the first dog-house raw material, mix, levigate in shaft kiln, make cement slurry, then, at 1450 ℃ of calcining 60min, chilling, pulverizing, ball milling obtain cement clinker.Table 5 be using lime dewatered sludge as one of cement raw material with the cement slurry burn-ability experimental result of traditional cement slurry mixed preparing.
The impact (1450 ℃) of table 5 Lime And Sewage Sludge volume on free calcium oxide
| Lime And Sewage Sludge addition content | 0% | 3% | 6% | 9% | 12% | 15% | 18% | 21% |
| Free calcium oxide content | 0.16% | 0.06% | 0.08% | 0.10% | 0.11% | 0.20% | 0.39 | 0.45% |
As known from Table 5, raising calcining temperature can significantly be improved the burn-ability of cement slurry.Even in the time that dog-house one place's dosage reaches 21%, still can produce qualified grog.But report according to data from abroad: grog is low 0.1% free calcium oxide often, per kilogram grog will increase hear rate 58.5 kilojoules (14 kilocalorie), and hence one can see that improves temperature has but increased the energy consumption of firing, and has increased the cost of whole manufacture of cement.Compare knownly with example 1, in manufacture of cement, according to the difference of sludge components and dog-house, it is a kind of more satisfactory effective means that raw-meal ingredient is regulated and controled.
Can find out from the above results, in Cement industry, according to the difference of composition in mud, difference according to dosage can be chosen suitable feeding mode, and can regulate and control cement slurry timely and effectively, utilize the impact on cement clinker quality of excessive admixture that the method can solve lime mummification municipal sludge, effectively guaranteed the operation of cement production process, improved production efficiency.
Claims (1)
1. the method for the feeding mode of cement kiln synergic processing lime mummification municipal sludge regulation and control, it is characterized in that by mud add calc-alkaline stablize drying process, high-temperature flue gas residual heat drying process, lime dewatered sludge from Vertical Mill or nsp kiln add the process of choosing and three processes of corresponding formula regulation and control form, concrete steps are as follows:
(1) calc-alkaline that adds of mud is stablized drying process
Water ratio is greater than to 80% dewatered sludge and adds calcium conditioning, institute's adding medicine is industrial calcium oxide, and the volume of industrial calcium oxide is 2% ~ 20% of mud gross weight, mechanical stirring 3 ~ 10min, and the 3 ~ 7d that then banks up, obtains the Lime And Sewage Sludge that water ratio is less than 60%;
(2) drying course of high-temperature flue gas waste heat
220 ~ 280 ℃ of thermal oils of high-temperature flue gas access by introducing portion kiln tail carry out degree of depth mummification to the mud that step (1) is obtained, and the moisture of mud is dried to 0 ~ 35%, obtain lime dewatered sludge; The waste gas producing in drying course is again sent into rotary kiln and is burnt, and avoids producing secondary pollution; The unified collection of waste water producing enters Sewage treatment systems, carries out a biological disposal upon, and again carries out reuse after up to standard;
(3) lime dewatered sludge is from the process that adds of Vertical Mill or nsp kiln
Select suitable dosing method according to the dosage of lime dewatered sludge, when lime account for mixed raw material ratio 5% ~ 10% time, need to supplement tripoli raw material, thereby guarantee that the grog of firing meets national standard (GB/T21372-2008 free calcium oxide content is less than 1.5%);
First kind of way: enter mixing belt after 1% ~ 21% lime dewatered sludge is utilized to residual heat drying together with cement slurry, entering after Vertical Mill mixing, grinding homogenizing, enter rotary system and calcine 60min at 1350 ~ 1500 ℃, then chilling, pulverizing, the levigate cement clinker that obtains; In this process, according to the chemical composition of added mud and dosage, can regulate and control the proportioning of raw material, when dosage reaches after 18%, need in raw material, supplement tripoli raw material, thereby guarantee the normal operation of manufacture of cement;
The second way: 1% ~ 12% lime dewatered sludge is directly dropped into nsp kiln (decomposing kiln charging) burning at 850-900 ℃, the raw material that mud burns after lime-ash and the preheating producing in nsp kiln are under wind effect, after mixing, homogenizing, enter rotary system, at 1350 ~ 1500 ℃, calcine 60min, then chilling, pulverizing, the levigate cement clinker that obtains.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402268A (en) * | 2014-11-25 | 2015-03-11 | 广西鱼峰水泥股份有限公司 | Method for increasing P.O42.5 cement powdery clinker mixing amount |
| CN104609685A (en) * | 2015-01-28 | 2015-05-13 | 大连东泰有机废物处理有限公司 | Method for co-treating anaerobic digested sludge via cement kiln |
| CN104743765A (en) * | 2015-04-09 | 2015-07-01 | 北京建筑材料科学研究总院有限公司 | Two-stage sludge drying treatment method |
| CN105000775A (en) * | 2015-06-19 | 2015-10-28 | 广州中科建禹环保有限公司 | Deep dewatering system and method for sludge |
| CN105384368A (en) * | 2015-11-17 | 2016-03-09 | 无锡江达节能科技股份有限公司 | Treatment method for pollutants generated in cement processing process |
| CN106082727A (en) * | 2016-06-21 | 2016-11-09 | 湖州南方水泥有限公司 | A kind of cement production process and equipment thereof |
| CN106186747A (en) * | 2016-06-30 | 2016-12-07 | 浙江新业管桩有限公司 | A kind of method utilizing printing and dyeing sludge to prepare high strength clinker |
| CN106186746A (en) * | 2016-06-30 | 2016-12-07 | 浙江新业管桩有限公司 | A kind of method utilizing printing and dyeing sludge to prepare clinker |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402268A (en) * | 2014-11-25 | 2015-03-11 | 广西鱼峰水泥股份有限公司 | Method for increasing P.O42.5 cement powdery clinker mixing amount |
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| CN106082727A (en) * | 2016-06-21 | 2016-11-09 | 湖州南方水泥有限公司 | A kind of cement production process and equipment thereof |
| CN106186747A (en) * | 2016-06-30 | 2016-12-07 | 浙江新业管桩有限公司 | A kind of method utilizing printing and dyeing sludge to prepare high strength clinker |
| CN106186746A (en) * | 2016-06-30 | 2016-12-07 | 浙江新业管桩有限公司 | A kind of method utilizing printing and dyeing sludge to prepare clinker |
| CN110183122A (en) * | 2019-05-21 | 2019-08-30 | 山东大学 | System and method based on industrial exhaust heat cooperative disposal solid waste preparation cementitious material |
| CN110183122B (en) * | 2019-05-21 | 2020-07-31 | 山东大学 | System and method for preparing cementing material based on industrial waste heat cooperative disposal of solid waste |
| CN110606493A (en) * | 2019-09-18 | 2019-12-24 | 武汉理工大学 | Method for preparing silicon-calcium powder for construction by using municipal sludge, silicon-calcium powder product prepared by method and application of silicon-calcium powder product |
| CN113636731A (en) * | 2021-09-09 | 2021-11-12 | 南京青橄榄环境工程有限公司 | Method for efficiently utilizing intermediate state substances in cement production to dry and dispose sludge |
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