CN103739184B - Method for drying and direct blending combustion of domestic sludge by using dry-process cement kiln waste heat - Google Patents
Method for drying and direct blending combustion of domestic sludge by using dry-process cement kiln waste heat Download PDFInfo
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- CN103739184B CN103739184B CN201410027957.5A CN201410027957A CN103739184B CN 103739184 B CN103739184 B CN 103739184B CN 201410027957 A CN201410027957 A CN 201410027957A CN 103739184 B CN103739184 B CN 103739184B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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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
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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
Abstract
The invention discloses a method for drying and direct blending combustion of domestic sludge by using dry-process cement kiln waste heat. The method comprises the following steps: firstly, mixing municipal sludge with an additive formed by sodium hydroxide, glycerol, diglycolamine, sodium alkyl benzene sulfonate and water; adding pulverized coal and slaked lime in a metering manner, and then drying by using the dry-process cement kiln head after-wind or the smoke behind a power generating boiler, which is introduced to a drying rotary kiln; and directly pumping the dried sludge mixture into an ascending flue between the dry-process cement dry method kiln tail and a decomposing furnace by a high-pressure interval of an air pump, and mixing and carrying out blending combustion on the kiln cement material. By adopting the method, not only can odor emission of the dry-process cement rotary kiln in the process of co-processing the municipal domestic sludge be effectively controlled, but also an operation environment is obviously improved, the dried sludge mixture can be directly fed into the cement dry method kiln tail to form a cement clinker in a blending combustion manner, the effect on parameters such as temperature of a rotary cement kiln production technology is small, the quality of the cement is not affected, utilization of cement kiln waste heat and sludge organic matter heat is achieved, safe co-processing of the domestic sludge is achieved, and the method has significant environment-friendly and economic benefits.
Description
Technical field
The present invention relates to a kind ofly utilize dry-process cement rotary kiln waste heat mummification municipal sludge so that mix the method for burn processing directly into kiln, particularly utilize flue gas and a kiln hood lingering remnants of past customs mummification municipal sludge after dry-process cement rotary kiln production line boiler of power generation by waste heat, and mix and burn the method for processing directly into kiln.
Background technology
Along with the sustainable development of China's economy, municipal sewage treatment capacity rapid growth, sludge creation amount sharply increases.In the 11th Five-Year end of term, the wet sludge yield in the annual whole nation has been up to 2,850 ten thousand tons.With regard to Guangxi District, be only example, municipal sewage treatment capacity presents a rapidly rising trend, and at the year ends 2010, whole district's sludge of sewage treatment plant annual production reaches 1,150,000 tons/year.The main disposal options of China's present stage mud is after dehydration, directly to carry out landfill or agricultural use etc. (wherein agricultural use accounts for 44.8%, land landfill accounts for 31%).Organism, germ and a small amount of heavy metal (copper, nickel, zinc, cadmium, chromium, lead, arsenic, mercury etc.) and complicated inorganics composition that the mud producing due to sewage work contains a large amount of difficult degradations, the disposal options such as employing landfill, compost are land occupation resource and the mankind's health is caused serious harm, also can cause the secondary pollutions such as stench, greenhouse gas emission and heavy metal pollution of soil not only.Due to China's industrial economy high speed development, produce a large amount of sludge of sewage treatment plant, existing disposal options has taken a large amount of arable lands and has caused the formed severe situation of heavy metal contamination, has become social contradications and the difficult problem of environmental protection that current China becomes increasingly conspicuous.
In the world, Europe, day etc., some developed countries just forbade industry and domestic sludge landfill as far back as 2005, the mode that the mud that sewage place factory (station) produces mainly adopts sludge heat drying to burn is processed, sludge heat drying incineration technology has obtained promoting widely in west industrially developed country in recent years, becomes the major way of sludge treatment.The direction that now dispose sludge treatment countries in the world is to walk the road for development of innoxious, minimizing, resource utilization.China also promulgates the sludge treatment disposal of < < urban wastewater treatment firm and pollution prevention technique policy (trying) > > in 2009-02-18, encourage to adopt anhydration and incineration mode, improve the utilization efficiency of heat energy of mud, innoxious, minimizing and resource utilization will become the main direction of China's sludge treatment and disposal.Independent anhydration and incineration technology and the equipment of mud that China started Introduced From Abroad maturation on Shanghai and other places is in recent years set up demonstration project, but this equipment manufacturing cost high (reaching 8,000 ten thousand yuan of left and right to process a complete set of equipment cost of 350 tons of wet mud day) and running cost large (wet sludge treatment expense per ton is about 350 yuan), in China and especially want large-scale promotion comparatively difficult under the present stage economic capability of Guangxi District.Present stage China digest and assimilate external advanced person mud directly separately anhydration and incineration technology, exploitation is applicable to the sludge reduction technology of China's national situation still in development, still need to solve large and this high difficult problem of operation of facility investment, and cannot process the mud that the inorganic flocculating agents such as bodied ferric sulfate produce.The mixed burning technology of carrying out with garbage burning factory, heat power plant etc. and unclassified stores is domestic has obtained certain application experience.But because there are the requirement of generating in garbage burning factory, heat power plant, in actual motion, a large amount of comparatively difficulties of mud that calorific values are low that receive, can not meet growing sludge of sewage treatment plant and process capacity requirement.
Owing to containing inorganics toward contact in sludge of sewage treatment plant except containing organism, these inorganicss mainly contain SiO
2, A1
2o
3, Fe
2o
3, the composition such as CaO, MgO, similar to many material of construction compositions (for example table one).Utilize mud and cement raw material after mummification to burn altogether the organism calorific value (for example table two) that not only can utilize mud, can also be as the raw material of manufacture of cement, the heavy metal simultaneously containing in mud is absorbed by grog, thereby reaches innoxious, minimizing, resource utilization, and ecological effect is better.Therefore, the technical study that country encourages to utilize cement kiln to mix burns sludge of sewage treatment plant etc., for sludge disposal is sought new mode, to overcome the high energy consumption shortcoming of the independent anhydration and incineration technology of mud.For example, Guangxi District existing large small cement plant family more than 240, Eleventh Five-Year Plan finishes rear whole district cement production capacity total amount and has reached 8780 tons/year, new type nonaqueous cement ratio accounts for 81%, now existing 12Ge city has and produces the new type nonaqueous cement production line that surpasses 1,000,000 tons per year, and this processes Guangxi District sludge from wastewater treatment plant for employing and cement raw material mixed burning and has created favourable condition.Therefore, utilize cement kiln mummification to mix and burn some regional domestic sludges processing of Reduction Technology and equipment Jiang Shi China of sludge of sewage treatment plant and the new way of disposing.
The content (wt%) of mineral compound in table one, mud ash content
| The mud place of production | SiO 2 | Al 2O 3 | Fe 2O 3 | Na 2O | K 2O | MgO | CaO |
| Liuzhou | 52.28 | 17.44 | 10.83 | 0.34 | 2.29 | 1.79 | 4.36 |
| Guilin | 43.35 | 19.45 | 11.34 | 0.51 | 2.49 | 2.26 | 4.85 |
| (cement raw material) clay | 66.32 | 15.86 | 5.08 | ＜1.50 | ＜2.50 | 1.40 | 1.09 |
| (cement raw material) coal ash | 53.84 | 30.42 | 5.16 | - | - | 1.30 | 4.52 |
The water content of table two, mud and combustion heat value characteristic
| The mud place of production | Water content (wt%) | The dewatered sludge combustion heat (kJ/kg) |
| Guilin | 87.37 | 3071 |
| Liuzhou | 80.16 | 2723 |
The cooling lingering remnants of past customs of kiln hood of drying rotary kiln cement producing line and the flue gas of kiln tail preheater C1 separator outlet etc. still contain not low heat.The drying rotary kiln production line of approximately 210T/h (210 tons/hour) grog throughput of Xingan conch in Guangxi District and Fusui conch two companies of take is example, kiln hood lingering remnants of past customs temperature is about 360-400 ℃, and the lingering remnants of past customs that wherein enters electricity generation boiler is about 18-20 ten thousand m
3/ h, is about 340-350 ℃ from the flue-gas temperature of C1 separator outlet simultaneously, and flue gas flow is about 22-26 ten thousand m
3/ h.The flue-gas temperature of above-mentioned flue gas after electricity generation boiler be still up to 210 ℃ of left and right, is the recycling comparatively ideal thermal source of mummification municipal sludge that comes, and can save energy cost.
The organic matter decomposing containing some perishableization in municipal sludge, under suitable condition, can decompose and discharge strong niff and poisonous and hazardous gas.Therefore, sludge drying treating processes can produce the foul gas that concentration is higher, for example hydrogen sulfide, mercaptan and thiomethyl alcohol, and they are major control indexs of mud deodorization.Especially mercaptan and thiomethyl alcohol adhesivity are very strong, are adsorbed on the stench that on the clothings such as fabric, generation is felt embarrassed to mention.Thereby, in the method for existing waste heat mummification municipal sludge, be no matter to adopt indirectly drying or the direct method of mummification, all inevitably produce a large amount of above-mentioned foul gass, directly and cause the environmental degradation in operation producing region because of equipment leakage.If being entered to kiln, burns the drying tail gas that contains a large amount of foul gass, must steam is separated, and this will cause the cost of disposal of mud and the remarkable increase that device drops into, and the tail gas after a large amount of separation enters the operating mode catastrophic fluctuation that kiln can cause cement kiln; If the drying tail gas that contains a large amount of foul gass is incorporated into the blowdown system of cement kiln, needing increases lyosorption and absorption tower, and the hydrogen sulfide absorbing, mercaptan and thiomethyl alcohol face a difficult problem for secondary pollution and processing.This is also that current manufacture of cement product man is reluctant to play an active part in one of predicament that utilizes cement kiln mummification to mix burning sludge of sewage treatment plant.Therefore, be necessary the method that burning disposal municipal sludge is mixed in the collaborative mummification of a kind of new drying rotary kiln cement producing line of innovation and development.
Summary of the invention
The object of this invention is to provide a kind of dry-process cement rotary kiln waste heat mummification municipal sludge that utilizes, during mummification, the foul gas components such as hydrogen sulfide, mercaptan and thiomethyl alcohol are cured in mummification solid phase, and the mixture after mummification is mixed to the treatment process of burning till cement composition directly into kiln.
Concrete steps are:
1) dewatered sludge of Sewage Plant is mixed with coal dust, white lime and additive, be size inhomogeneous granular be mud mixture; In mixing process, white lime absorbs the moisture content aquation in mud, and additive absorbs and suppresses odorous gas in mud and comes out; The quality of described coal dust, white lime and additive is respectively 10-12%, 8-15% and the 1-3% of dewatered sludge quality; Described additive is the emulsification mixed solution that sodium hydroxide, glycerol, diglycolamine, sodium alkyl benzene sulfonate and water are mixed to form, and in mixed solution, the mass percent of each component is: sodium hydroxide 12-15%, glycerol 8-10%, diglycolamine 15-25%, sodium alkyl benzene sulfonate 4-6% and water 44-61%.
2) by the flue gas (temperature is about 210 ℃) after the dry-process cement rotary kiln kiln hood lingering remnants of past customs (temperature is 360-400 ℃) or electricity generation boiler, by induced draft fan and tornadotron, being input to rotary type mummification kiln is in drying rotary kiln.
3) on the entrance airduct of drying rotary kiln, be equipped with mud entrance, step 1) gained mud mixture mechanical transport is fallen in airduct to mud ingress, by means of the cyclonic wind in airduct, mud mixture is blown and brought in drying rotary kiln; Mud mixture absorbs the heat mummification 40-60 minute of flue gas or the lingering remnants of past customs in drying rotary kiln, makes the mud mixture water content after mummification be less than 10%; In drying process, hydrogen sulfide, mercaptan and thiomethyl alcohol foul gas component are reacted with white lime and are generated sulphide salt, alkoxide etc., and are added agent absorption, and foul gas component is cured in solid phase mummification granule materials (being dewatered sludge mixture).
Wherein: (1) mud mixture inlet amount is: 2.0-2.5T/h;
(2) flue gas (temperature the is about 210 ℃) flow after the electricity generation boiler of introducing is: 18-22 ten thousand m
3/ h, or the kiln hood lingering remnants of past customs (temperature is about 360-400 ℃) flow is: 10-12 ten thousand m
3/ h;
4) humid flue gas that drying rotary kiln is discharged is introduced the original smoke processing system in cement mill and is processed.
5) the resulting solid phase mummification of step 3) drying rotary kiln granule materials (being dewatered sludge mixture) enters feeding chamber after ball mill pulverizing, with the high pressure gas interval of pneumatic pump, squeeze in the funnel uptake between dry-process cement rotary kiln kiln tail and decomposing furnace, after combustion decomposition, mix and mix calcination of cement clinker with raw material in kiln, incorporation is not more than 10% of cement kiln clinker throughput; The oxygen that provides part sludge incineration to need is provided the high-pressure air that pneumatic pump is pressed into, and makes sludge disintegration burning more complete; Mix in burning process, in dewatered sludge mixture, contained organic matter and coal dust provide calorific value to supplement mud to mix and burn required heat, make cement production system metering process parameter fluctuation minimum, production technique temperature parameter do not exceed permission ± 50 ℃ of fluctuation ranges; In mud, in contained inorganics component and dewatered sludge mixture, solidifying contained calcareous inorganic component enters into cement composition and becomes cement clinker, the calcium oxide being metered into makes this slaking under the processing condition that approach grog fusing stoichiometric of mud mixture, avoided sludge components irregular in the slaking in high-temperature maturing stage rapidly and the raw material slaking mixed melting of production line itself; And solidify contained foul gas component in dewatered sludge mixture, by 1000 ℃ of above pyrolytic decompositions in funnel uptake, become SO
2, carbonaceous organic material composition is resolved into CO by high-temp combustion
2, with decomposing furnace rising flue gas, enter after decomposing furnace leading portion cement production system is processed by cement producing line exhaust treatment system and discharge.
The present invention had both utilized calorific value and the residual components of dry-process cement rotary kiln waste heat, domestic sludge, had reduced again the discharge that foul gas in burning process is mixed in domestic sludge mummification, had improved production operation environment, and did not affect cement production process and Cement Quality.
Accompanying drawing explanation
Fig. 1 is the preparation flow figure of additive of the present invention.
Fig. 2 is that the present invention utilizes dry-process cement rotary kiln waste heat mummification municipal sludge and directly mixes and burn the method flow diagram of processing.
Embodiment
Below by specific embodiment, the present invention is described in detail, but should be appreciated that the present invention is not only limited to described embodiment.
Embodiment:
The dry cement production line of facilities and equipments 1:230T/h raw material inlet amount.
Facilities and equipments 2: rotary type mummification kiln, approximately 18 meters of approximately 0.8 meter of intracavity diameter and length, the internal chamber wall staggered arrangement long fold-type flight of 20cm of having an appointment.
Domestic sludge source: certain municipal dehydration activity mud, water ratio approximately 80.05%, can calcination thing (organism) content approximately 13.95%, dewatered sludge calorific value approximately 6000 kJ/kg(kilocalories), the about 6.0%(of remaining inorganic content is wherein containing SiO
252.28%, Al
2o
317.44%, Fe
2o
310.83%, Na
2o 0.34%, K
2o 2.29%, MgO 1.79%, CaO 4.36% etc.).
(1) by sodium hydroxide, glycerol, diglycolamine, sodium alkyl benzene sulfonate and water, respectively after 15%, 10%, 20%, 5% and 50% weighing by mass percentage, sodium hydroxide and water dissolution are mixed, add successively again glycerol, diglycolamine and sodium alkyl benzene sulfonate, be uniformly mixed, form emulsification mixed solution, be additive mixed liquor, this mixture can be stablized preservation more than one month.
(2) every batch, Sewage Plant dehydration activity mud is dropped into 10 tons in blending bunker, add while stirring 0.3 ton of step 1) gained additive mixed liquor, add subsequently 1 ton of levigate coal dust and 0.8 ton of white lime 8% to continue to mix; It is granular that mixed mud mixture is the inhomogeneous solid phase of size.
(3) temperature of cement producing line electricity generation boiler being discharged be 210 ℃ of flue gases without economizer, induced draft fan and whirlwind airduct by independent setting are input in drying rotary kiln, flue gas introduction volume is about 220,000 m
3/ h.
The operating parameter of drying rotary kiln maintains between turn/min of kiln running speed 1.5-2.0, body of heater preheating 3 hours.With rotary conveyor by step 2) the mud mixture input that gets togather of gained premix delivers in the loading hopper on drying rotary kiln entrance airduct, falls in airduct, by the whirlwind wind-force in airduct, mud mixture is blown to bring into and in drying rotary kiln, turns round mummification; Mud mixture inlet amount is controlled at 2.4 T/h, and drying time is adjusted control by controlling kiln running speed, makes mud mixture drying time in drying rotary kiln be no less than 60 minutes; When drying rotary kiln running speed is 1.5 turn/min, the mud mixture water content after mummification is 8.89% after measured.
(4) the dewatered sludge mixture that drying rotary kiln discharge port place falls is transported to ball mill ball milling and grinds for 1 hour, and the smoke processing system that the containing water vapor flue gas that drying rotary kiln kiln tail is discharged is incorporated into cement mill discharges after processing again; Dewatered sludge mixture after pulverizing winches on the service platform at new type nonaqueous cement production line decomposing furnace and funnel uptake place and is injected in the feeding warehouse of independent setting, and the flue of squeezing into new type nonaqueous cement production line decomposing furnace bottom with the high pressure gas interval of pneumatic pump enters kiln and mixes burning; Pneumatic pump is made a defective material at interval of 20s, and the dewatered sludge mixture of at every turn squeezing into is 3.2 kg.
The flue of new type nonaqueous cement production line decomposing furnace bottom being squeezed into in dewatered sludge mixture interval with the high pressure gas of pneumatic pump enters kiln and mixes burning, its objective is that will solve material enters kiln difficult problem, and can be disperseed rapidly after can making material enter kiln, the oxygen that provides part sludge incineration to need can be provided the high-pressure air that pneumatic pump is pressed into simultaneously, makes sludge disintegration burning more complete.In addition, prior reason is that interval charging can make cement kiln processing parameter stable equilibrium fast, fluctuates less.Because the organism of dewatered sludge mixture itself has a large amount of calorific values, the coal adding by calculating further provides enough heats, can make like this cement kiln production technique temperature parameter not exceed the fluctuation range of permission.In the present embodiment, mud enters kiln and mixes after burning, and the temperature in new type nonaqueous cement production line calcination rotary kiln has only declined 10 ℃.The calcium oxide being simultaneously metered into can make this slaking under the processing condition that approach grog fusing stoichiometric of mud mixture, can be rapidly and the raw material slaking mixed melting of production line itself, and avoided sludge components irregular in the slaking in high-temperature maturing stage.
In embodiment process, in domestic sludge mummification, mix in burning process and add after coal dust, white lime and additive, the discharge intensity of stink is reduced to below 1 grade above from 2 grades, and the odor strength of setting is reduced to 1 grade from 5 grades, has obvious stink removal effect.And dewatered sludge enters kiln and mixes not only not declines of performance such as burning rear cement setting time, intensity and character, strengthens to some extent on the contrary.Pass through embodiment, illustrated that present method utilizing the residual heat to dry sludge of cement production process the mud stink discharge in disposal process can be controlled effectively simultaneously, significantly improved operating environment, dewatered sludge mixture can enter kiln and mix calcination of cement clinker, reach the utilization of waste heat and the cooperative disposal of mud in cement production process, shown feasibility and the novelty of present method.
Result is as follows:
(1) stink discharge:
In drying process, domestic sludge enters drying rotary kiln separately and while not adding unclassified stores, and mummification is after 2 hours, can feel obvious foul smell at about 2 kms of test point off-site, but the sense of feeling sick.And within the scope of near test point 50 meters, operating personnel's susceptible is remarkable,, there is the sense of feeling sick in the indivedual operator in place that especially feed intake.The working suit that operating personnel dresses is changed rear second day and still can on clothing, be smelt an offensive odor.After normal interpolation coal dust, white lime and additive, at about 2 kms of test point off-site, can't smell foul smell, within the scope of near test point 50 meters, operating personnel has slight stink sense.At the place that feeds intake, operator still can susceptible stink, but the sense of feeling sick.The working suit that operating personnel dresses is changed rear second day and on clothing, can't smell stink.Therefore, in domestic sludge mummification, mix in burning process and add after coal dust, white lime and additive, the discharge intensity of stink is reduced to below 1 grade above from 2 grades, and the odor strength of setting is reduced to 1 grade from 5 grades, has obvious stink removal effect.
Within the scope of 10 meters of production operation operational zones, collecting the odor concentration that detects uncontrollable discharge is: H
2s concentration is less than 0.015mg/m
3, thiomethyl alcohol concentration is less than 0.0055mg/m
3, substantially reach 1 grade of factory's boundary mark accurate.Collect the smoke stack emission mouth that detects this cement mill, can't detect H
2s and thiomethyl alcohol, though this likely the discharge flue gas after mummification contain micro-stink but by the gas wash tower in cement mill, absorbed.In addition, SO in the smoke stack emission gas in cement mill in process of the test
2before and after concentration test, be all 10 mg/m
3, illustrate that mud enters kiln and mixes burning to SO
2the monitoring impact of discharge is little, the SO of cement producing line
2discharge is still at 50 mg/m
3below the special emission limit of country.
(2) comparison of Cement Quality:
By comparing the kiln that enters of dewatered sludge mixture, mix the variation of burning front and back Cement Quality, can obtain from the result of table three, table four and table five Cement Quality, present method gained dewatered sludge mixture enters cement burning rotary kiln and mixes not only not declines of performance such as burning rear cement setting time, intensity and character, strengthen to some extent on the contrary, shown the feasibility of present method.
Table three mud is mixed the comparison of burning rear cement setting time
| Test character | Initial set/min | Final set/min | C 3S/% | C 2S/% |
| Normal production | 142 | 196 | 42.57 | 29.63 |
| Mud is mixed burning | 137 | 183 | 45.78 | 25.98 |
| GB 175-2007 | ≥45 | ≤390 | 50%～70% | 18%～30% |
Table four mud is mixed the comparison of burning rear strength of cement
| Test character | Anti-folding/the MPa of 3d | 3d resistance to compression/MPa | Anti-folding/the MPa of 28d | 28d resistance to compression/MPa |
| Normal production | 2.5 | 10.5 | 6.0 | 32.5 |
| Mud is mixed burning | 2.7 | 10.4 | 6.3 | 34.4 |
| GB 175-2007 | ≥2.5 | ≥10 | ≥5.5 | ≥32.5 |
Table five mud is mixed the comparison of burning rear cement performance
| Test character | Loss on ignition/% | MgO/% | Alkali content/% | SO 3/% | Fineness/% | Than table/(m 2/kg) |
| Normal production | 0.37 | 1.69 | 0.24 | 0.13 | 2.7 | 359 |
| Mud is mixed burning | 0.31 | 1.94 | 0.32 | 0.17 | 2.5 | 365 |
| GB 175-2007 | ≤5.0 | ≤5.0 | ≤0.6 | ≤3.5 | ≤10 | ≥300 |
Claims (1)
1. utilize dry-process cement rotary kiln waste heat mummification domestic sludge and directly mix and burn a method of processing, it is characterized in that concrete steps are:
1) dewatered sludge of Sewage Plant is mixed with coal dust, white lime and additive, be size inhomogeneous granular be mud mixture; In mixing process, white lime absorbs the moisture content aquation in mud, and additive absorbs and suppresses odorous gas in mud and comes out; The quality of described coal dust, white lime and additive is respectively 10-12%, 8-15% and the 1-3% of dewatered sludge quality; Described additive is the emulsification mixed solution that sodium hydroxide, glycerol, diglycolamine, sodium alkyl benzene sulfonate and water are mixed to form, and in mixed solution, the mass percent of each component is: sodium hydroxide 12-15%, glycerol 8-10%, diglycolamine 15-25%, sodium alkyl benzene sulfonate 4-6% and water 44-61%;
2) by temperature, be that the dry-process cement rotary kiln kiln hood lingering remnants of past customs or the temperature of 360-400 ℃ is 210 ℃ of flue gases after electricity generation boiler, by induced draft fan and tornadotron, being input to rotary type mummification kiln is in drying rotary kiln;
3) on the entrance airduct of drying rotary kiln, be equipped with mud entrance, step 1) gained mud mixture mechanical transport is fallen in airduct to mud ingress, by means of the cyclonic wind in airduct, mud mixture is blown and brought in drying rotary kiln; Mud mixture absorbs the heat mummification 40-60 minute of flue gas or the lingering remnants of past customs in drying rotary kiln, makes the mud mixture water content after mummification be less than 10%; In drying process, hydrogen sulfide, mercaptan and thiomethyl alcohol foul gas component are reacted with white lime and are generated sulphide salt, alkoxide, and are added agent absorption, and making foul gas component be cured to solid phase mummification granule materials is in dewatered sludge mixture;
Wherein: (1) described mud mixture inlet amount is: 2.0-2.5t/h;
(2) described temperature is that the flue gas flow after the electricity generation boiler of 210 ℃ is: 18-22 ten thousand m
3/ h; Described temperature is that 360-400 ℃ of kiln hood lingering remnants of past customs flow is: 10-12 ten thousand m
3/ h;
4) humid flue gas that drying rotary kiln is discharged is introduced the original smoke processing system in cement mill and is processed;
5) step 3) drying rotary kiln gained dewatered sludge mixture enters feeding chamber after ball mill pulverizing, with the high pressure gas interval of pneumatic pump, squeeze in the funnel uptake between dry-process cement rotary kiln kiln tail and decomposing furnace, after combustion decomposition, mix and mix calcination of cement clinker with raw material in kiln, incorporation is not more than 10% of cement kiln clinker throughput; The oxygen that provides part sludge incineration to need is provided the high-pressure air that pneumatic pump is pressed into, and makes sludge disintegration burning more complete; Mix in burning process, in dewatered sludge mixture, contained organic matter and coal dust provide calorific value to supplement mud to mix and burn required heat, make cement production system metering process parameter fluctuation minimum, production technique temperature parameter do not exceed permission ± 50 ℃ of fluctuation ranges; In mud, in contained inorganics component and dewatered sludge mixture, solidifying contained calcareous inorganic component enters into cement composition and becomes cement clinker, the calcium oxide being metered into makes this slaking under the processing condition that approach grog fusing stoichiometric of mud mixture, avoided sludge components irregular in the slaking in high-temperature maturing stage rapidly and the raw material slaking mixed melting of production line itself; And solidify contained foul gas component in dewatered sludge mixture, by 1000 ℃ of above pyrolytic decompositions in funnel uptake, become SO
2, carbonaceous organic material composition is resolved into CO by high-temp combustion
2, with decomposing furnace rising flue gas, enter after decomposing furnace leading portion cement production system is processed by cement producing line exhaust treatment system and discharge.
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|---|---|---|---|
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| CN104609685B (en) * | 2015-01-28 | 2016-09-21 | 大连东泰有机废物处理有限公司 | The method of cement kiln synergic processing anaerobically digested sludge |
| CN104764023B (en) * | 2015-04-21 | 2017-03-29 | 刘勇 | Domestic waste exempts to sort closed burning dust circulation process method |
| CN107420900A (en) * | 2017-08-30 | 2017-12-01 | 长沙中硅水泥技术开发有限公司 | The processing method and processing system of house refuse |
| CN107954585A (en) * | 2017-11-27 | 2018-04-24 | 江苏理工学院 | A kind of domestic sludge assists coal desiccation molding machine |
| CN109608067A (en) * | 2018-12-17 | 2019-04-12 | 重庆市渝溪产业（集团）有限公司 | Municipal sludge collaboration processing unit and treatment process based on JT kiln |
| CN110694458A (en) * | 2019-09-18 | 2020-01-17 | 武汉理工大学 | Method for absorbing carbon dioxide in lime kiln flue gas by using municipal sludge |
| 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 |
| CN110790475A (en) * | 2019-11-22 | 2020-02-14 | 山西平朔煤矸石发电有限责任公司 | Flue gas recirculation coupling sludge drying on-line mixed combustion system of thermal power plant |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4554002A (en) * | 1983-05-16 | 1985-11-19 | N-Viro Energy Systems Ltd. | Beneficiating waste sludges for agricultural use and product made thereby |
| US5435923A (en) * | 1992-03-20 | 1995-07-25 | Bio Gro Systems, Inc. | Method for the treatment of sewage sludge and the like |
| CN102435082B (en) * | 2011-10-28 | 2013-07-31 | 北京建筑材料科学研究总院有限公司 | Two-phase heat exchanger and system utilizing cement kiln waste heat to dry sludge |
| CN102531429B (en) * | 2012-01-16 | 2013-01-23 | 郑慧 | Method for synergetically treating fluorine-containing sludge in cement kiln |
| CN102659294A (en) * | 2012-05-23 | 2012-09-12 | 重庆大学 | Method for solidifying sludge of urban sewage treatment factory by using ardealite, coal ash and carbide slag |
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