CN101870549A - Circulation coupling process for drying mud by waste heat of cement kiln tail gas - Google Patents
Circulation coupling process for drying mud by waste heat of cement kiln tail gas Download PDFInfo
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- CN101870549A CN101870549A CN200910050098A CN200910050098A CN101870549A CN 101870549 A CN101870549 A CN 101870549A CN 200910050098 A CN200910050098 A CN 200910050098A CN 200910050098 A CN200910050098 A CN 200910050098A CN 101870549 A CN101870549 A CN 101870549A
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Abstract
The invention relates to a circulation coupling process for drying mud by waste heat of cement kiln tail gas, which comprises a process for drying the mud. The process for drying the mud comprises the following steps: firstly, storing the wet mud; then, sending the wet mud into a drying machine to be dried; sending the dried mud into a dry mud feeding device; sending the dry mud into a cement kiln through the dry mud feeding device; sending tail gas as generated in the cement kiln into the drying machine through a tail gas blower; sending the dry tail gas exhausted by the drying machine into a smoke gas processing system; and exhausting out the dry tail gas through a draught fan after the dry tail gas reaches the standard after being treated by the smoke gas treatment system. The invention uses the waste heat of the cement kiln tail gas for drying the mud, the dried mud part replaces coal to be used as the fuel, and the clinker part generated by mud combustion replaces cement production raw materials. On one hand, the low-grade waste heat in the tail gas is effectively utilized, and on the other hand, the consumption of the fuel coal and the cement production raw materials is saved, so the invention realizes the resource utilization of the mud.
Description
Technical field:
The present invention relates to the environmental protection field, relate in particular to the treatment technology of mud, particularly a kind of circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying.
Background technology:
It is a kind of method of effective reduction sludge volume that sludge incineration is disposed, and the technical superiority of burning is the thoroughness of its processing, and reduction rate can reach about 95%, and organism is by complete oxidation.Mud (dry state) as analysed basis has many similarities at aspects such as physical properties, ultimate analysis, technical analysis and net calorific value and brown coal, and the dewatered sludge thermal value is 2500～4000kcal/kg.Therefore, dewatered sludge can be used as low side fuel and is used for the alternative coal of manufacture of cement, to cut down the consumption of energy, economizes on resources.
Consider that from environmental mud is the Municipal waste that the municipal sewage treatment process produces, but considers that from chemical ingredients the main chemical compositions of the burning ash that forms after the sludge incineration is CaO, SiO
2, A1
2O
3And Fe
2O
3Deng, approaching with the component of cement slurry and cement clinker.Act as a fuel if substitute coal, be used to produce cement clinker, consumption that then can the fuel economy coal with sludge part; While mud lime-ash part place of cement raw materials for production, the consumption that can save material again.
Therefore, cement production process is an important platform of handling mud, can utilize the cement kiln low temperature exhaust gas that mud is carried out drying, dried mud can the part place of cement be produced required coal and raw material again, so both effectively utilized low grade residual heat, save the energy, realized the innoxious and resource utilization of mud again.The cement output of China surpasses 1,000,000,000 tons at present, and cement is the various lots of material of a class, so adopt this technology can receive and handle mud in a large number.
Found by retrieval that the patent No. is 200510069188.6, name is called the technical scheme of " utilizing cement rotary kiln to handle the way of municipal sludge ".This scheme requires mud to carry out pre-treatment before entering rotary kiln, the needed active calcium oxide of pre-treatment must be calcined under 650～1100 ℃ of high temperature and make, therefore this scheme has increased the high-temperature calcination process one time on original cement production process, and using waste heat from tail gas does not effectively utilize the shortcoming that have complex process, invest significantly increase, energy consumption is high yet.
Summary of the invention:
The object of the present invention is to provide a kind of circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying, the described this circulation coupling process of waste heat of cement kiln tail gas sludge-drying that utilizes will solve the high technical problem of complex process, energy consumption of utilizing cement kiln end gas disposal mud in the prior art.
This circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying of the present invention, comprise that one is carried out the exsiccant process to mud, wherein, described mud is carried out in the exsiccant process, the mud that at first will wet stores, the mud that will wet is then sent in the drying machine and is carried out drying, more dried mud is sent into cement kiln by a feeding device and burns, and utilizes a blower fan that the tail gas that produces in the cement kiln is sent into described drying machine simultaneously.
Further, mud is carried out in the exsiccant process, the dried tail gas of drying machine discharge is sent into a smoke processing system carry out purifying treatment, after finishing dealing with, efflux by an induced draft fan again described.
Further, described mud is carried out in the exsiccant process, after dried mud entered cement kiln, the chemical reaction that dewatered sludge is acted as a fuel to manufacture of cement provided energy, and the lime-ash that dewatered sludge burning back is produced participates in chemical reaction as cement producting material.
Further, described drying machine is by base, support, cylinder, feeding device, stir shaft, feed box, stir shaft drive unit and drum drive constitute, described support is arranged on the described base, one end of support is connected by linkage with base, be provided with lifting device between the other end of support and the base, described feeding device and stir shaft drive unit all are arranged on the support, the two ends of described cylinder are respectively arranged with connecting cylinder, be provided with tightness system between cylinder and the connecting cylinder, connecting cylinder is fixedly installed on the support, described drum drive is arranged on the support, drum drive is connected with cylinder, the two ends of described stir shaft utilize bearing fixing on support, the central axis of stir shaft is parallel with the central axis of cylinder, stir shaft is connected with the stir shaft drive unit, feeding device is arranged on outside the feed end of cylinder, the connecting cylinder of feed end is provided with an exhanst gas outlet, the connecting cylinder of discharge end is provided with a gas approach, described feed box is connected the bottom of the connecting cylinder of discharge end, the stir shaft mounted in pairs has agitating vane, described agitating vane is along the axial array of stir shaft, between the axial any adjacent agitating vane of stir shaft, be provided with angle, radially be provided with a plurality of straight flights or a plurality of curved flight on the inner wall of rotary drum, described straight flight and described curved flight arrange alternately axially that along cylinder the straight flight of contiguous cylinder feed end or the distribution density of curved flight are less than the straight flight of contiguous cylinder discharge end or the distribution density of curved flight.
Principle of work of the present invention is: wet mud enters sludge drier by wet mud storage feeding system, enter cement kiln by the dewatered sludge feeding device behind the drying sludge, after dewatered sludge enters cement kiln, the part that acts as a fuel substitutes coal, both recycled the energy in the mud, again the consumption of fuel economy coal.Simultaneously, the raw material that the lime-ash that sludge incineration produces can the part place of cement be produced is realized the recycling of mud; The cement kiln tail gas that produces in the cement kiln cement clinker production process (200～300 ℃ of temperature) enters the thermal source of drying machine as sludge drying by exhaust fan, and wet mud is dried in drying machine under the heat that cement kiln tail gas provides.The dried tail gas of band moisture and pollutent is through behind the smoke processing system, effluxes after reaching emission standard.Thereby realize the recycling of mud and making full use of of waste heat.Mud is through dehydration procedure, be transported to drying machine, in drying machine, mud is transported in the cylinder by Shaftless screw conveyor and is cut into little group, under the promotion of cylinder interior forward end guide thread, mud moves to the flight district, and mud is taken up repeatedly by the intravital flight of cylinder after entering the flight district, is stirred blade when falling and smashes.Cement kiln tail gas enters cylinder by gas approach, carries out heat exchange with mud in the mode that directly contacts, and makes moisture evaporation in the mud; Carry the dried tail gas of moisture and discharge from exhanst gas outlet, the flow direction of flue gas and mud is an adverse current.Feeding device, stir shaft and cylinder are installed on the at one end liftable support, and activity one end of support can be regulated height, adjusts the inclination angle of drying machine among a small circle with this, and then can adjust the water ratio of the mud residence time and sludge-drying in cylinder.
The wet mud storage feeding system, dewatered sludge feeding device, cement kiln, exhaust fan, smoke processing system and the induced draft fan that adopt among the present invention all adopt known schemes of the prior art, relevant above-mentioned known solution, those skilled in the art all understands, does not repeat them here.
The present invention compares with prior art, and its effect is actively with tangible.The present invention has following advantage:
1, one-time investment is little.Because the thermal capacity of cement kiln is big, utilizes using waste heat from tail gas to come sludge-drying can't cause the change that the cement production process process control is big, do not need system device is done big improvement yet, therefore relatively low in the investment of unit disposing capacity.
2, the sludge treatment ability is big.Because large-scale manufacture of cement can allow to enter material in quantity and qualitative appropriateness fluctuation, with respect to whole material treatment capacity, mud adds the minor alteration that institute only causes composition, so can be much larger than the processing power that has professional treatment equipment now on the scale utilizing of waste.
3, energy utilization rate height.The using waste heat from tail gas of cement kiln can be done cryodrying to mud, has saved the consumption of conventional oil; Mud after the mummification has higher calorific value, can be used as the auxiliary fuel of manufacture of cement, and part substitutes coal.
4, useless admittedly zero release.The lime-ash that sludge incineration produces, the raw material that the part place of cement is produced does not have the discharging of solid waste.
Description of drawings:
Fig. 1 is a kind of schematic flow sheet that utilizes the circulation coupling process of waste heat of cement kiln tail gas sludge-drying of the present invention.
Fig. 2 is the structural representation of the drying machine in a kind of circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying of the present invention.
Fig. 3 is that the A of Fig. 2 is to view.
Embodiment:
As shown in Figure 1, a kind of circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying of the present invention, comprise that one is carried out the exsiccant process to mud, described mud is carried out in the exsiccant process, the mud that at first will wet is sent into mud storage feeding device 21, the mud that will wet is then sent into and is carried out drying in the drying machine 22, and dried mud is sent into a dewatered sludge feeding device 23, by dewatered sludge feeding device 23 dewatered sludge is sent into cement kiln 24 and burns; Dewatered sludge burns jointly with coal in cement kiln 24, and the lime-ash part place of cement raw materials for production that sludge incineration forms add other lime raw material, obtain qualified cement; The tail gas that cement kiln 24 is discharged is sent into drying machine 22 by an exhaust fan 25; Tail gas and the direct contact heat-exchanging of wet mud that cement kiln 24 is discharged, wet mud moisture in moving process constantly evaporates, the dried tail gas that produces in the drying machine 22 is sent into a smoke processing system 26, dried tail gas by smoke processing system 26 handle up to standard after, efflux by induced draft fan 27 again.
As shown in Figures 2 and 3, drying machine is by base 1, support 9, cylinder 2, feeding device 3, stir shaft 4, feed box 5, stir shaft drive unit 12 and drum drive 11 constitute, wherein, described support 9 is arranged on the described base 1, one end of support 9 and base 1 are connected by linkage, be provided with lifting device between the other end of support 9 and the base 1, described feeding device 3 and stir shaft drive unit 12 all are arranged on the support 9, the two ends of described cylinder 2 are respectively arranged with connecting cylinder, be provided with tightness system between cylinder 2 and the connecting cylinder, connecting cylinder is fixedly installed on the support 9, described drum drive 11 is arranged on the support 9, drum drive 11 is connected with cylinder 2, the two ends of described stir shaft 4 utilize bearing fixing on support 9, the central axis of stir shaft 4 is parallel with the central axis of cylinder 2, stir shaft 4 is connected with stir shaft drive unit 12, feeding device 3 is arranged on outside the feed end of cylinder 2, the connecting cylinder of feed end is provided with an exhanst gas outlet 7, the connecting cylinder of discharge end is provided with a gas approach 8, described feed box 5 is connected the bottom of the connecting cylinder of discharge end, stir shaft 4 mounted in pairs have agitating vane 41, described agitating vane 41 is along the axial array of stir shaft 4, between the axial any adjacent agitating vane 41 of stir shaft 4, be provided with angle, radially be provided with a plurality of straight flights 101 or a plurality of curved flight 102 on cylinder 2 inwalls, the curved flight 102 of one a straight flight 101 of circle and a circle arranges that alternately the straight flight 101 of contiguous cylinder 2 feed ends or the distribution density of curved flight 102 are less than the straight flight 101 of contiguous cylinder 2 discharge ends or the distribution density of curved flight 102.Mud is through behind last one dehydration procedure, be transported to feeding device 3, mud is transported in the cylinder 2 by Shaftless screw conveyor and is cut into little group, under the promotion of cylinder 2 interior forward end guide threads, mud moves to flight district 10, mud enters 10 backs, flight district and is taken up repeatedly by cylinder 2 intravital flights, is stirred blade 41 when falling and smashes.Cement kiln tail gas enters cylinder 2 by gas approach 8, carries out heat exchange with mud in the mode that directly contacts, and makes moisture evaporation in the mud; Carry the dried tail gas of moisture and discharge from the exhanst gas outlet 7 of the other end, the flow direction of flue gas and mud is an adverse current.Feeding device 3, stir shaft 4 and cylinder 2 are installed on the at one end liftable support 9, activity one end of support 9 can be regulated height, adjust the inclination angle of drying machine among a small circle with this, and then can adjust the water ratio of the material residence time and sludge-drying in cylindrical shell.
Claims (4)
1. circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying, comprise that one is carried out the exsiccant process to mud, it is characterized in that: mud is carried out in the exsiccant process described, the mud that at first will wet stores, the mud that will wet is then sent in the drying machine and is carried out drying, again dried mud is sent into cement kiln by a feeding device and burn, utilize a blower fan that the tail gas that produces in the cement kiln is sent into described drying machine simultaneously.
2. the circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying as claimed in claim 1, it is characterized in that: mud is carried out in the exsiccant process described, the dried tail gas that produces in the drying machine is sent into a smoke processing system carry out purifying treatment, after finishing dealing with, efflux by an induced draft fan again.
3. the circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying as claimed in claim 1, it is characterized in that: mud is carried out in the exsiccant process described, after dried mud enters cement kiln, the chemical reaction that dewatered sludge is acted as a fuel to manufacture of cement provides energy, and the lime-ash that dewatered sludge burning back is produced participates in chemical reaction as cement producting material.
4. the circulation coupling process that utilizes the waste heat of cement kiln tail gas sludge-drying as claimed in claim 1, it is characterized in that: described drying machine is by base, support, cylinder, feeding device, stir shaft, feed box, stir shaft drive unit and drum drive constitute, described support is arranged on the described base, one end of support is connected by linkage with base, be provided with lifting device between the other end of support and the base, described feeding device and stir shaft drive unit all are arranged on the support, the two ends of described cylinder are respectively arranged with connecting cylinder, be provided with tightness system between cylinder and the connecting cylinder, connecting cylinder is fixedly installed on the support, described drum drive is arranged on the support, drum drive is connected with cylinder, the two ends of described stir shaft utilize bearing fixing on support, the central axis of stir shaft is parallel with the central axis of cylinder, stir shaft is connected with the stir shaft drive unit, feeding device is arranged on outside the feed end of cylinder, the connecting cylinder of feed end is provided with an exhanst gas outlet, the connecting cylinder of discharge end is provided with a gas approach, described feed box is connected the bottom of the connecting cylinder of discharge end, the stir shaft mounted in pairs has agitating vane, described agitating vane is along the axial array of stir shaft, between the axial any adjacent agitating vane of stir shaft, be provided with angle, radially be provided with a plurality of straight flights or a plurality of curved flight on the inner wall of rotary drum, described straight flight and described curved flight arrange alternately axially that along cylinder the straight flight of contiguous cylinder feed end or the distribution density of curved flight are less than the straight flight of contiguous cylinder discharge end or the distribution density of curved flight.
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|---|---|---|---|
| CN200910050098A CN101870549A (en) | 2009-04-27 | 2009-04-27 | Circulation coupling process for drying mud by waste heat of cement kiln tail gas |
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| CN200910050098A CN101870549A (en) | 2009-04-27 | 2009-04-27 | Circulation coupling process for drying mud by waste heat of cement kiln tail gas |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173554A (en) * | 2011-01-07 | 2011-09-07 | 袁文献 | System for drying and handling sludge with waste gas from cement production |
| CN102173553A (en) * | 2011-01-07 | 2011-09-07 | 袁文献 | Method for drying and processing sludge by use of cement production waste gas |
| CN102976575A (en) * | 2012-11-29 | 2013-03-20 | 广州市越堡水泥有限公司 | Sludge treatment system and method in cement kiln |
| CN103964668A (en) * | 2014-05-29 | 2014-08-06 | 湖南省建筑材料研究设计院有限公司 | Sludge treatment process equipment and treatment method |
| CN104315844A (en) * | 2014-11-15 | 2015-01-28 | 郭金良 | Process for producing brick by waste heat drying sludge from sintered brick production line tunnel kiln |
| CN104930842A (en) * | 2015-07-14 | 2015-09-23 | 东源辉科建材发展有限公司 | Drying equipment by means of waste heat |
| CN105481227A (en) * | 2015-12-25 | 2016-04-13 | 北京建筑材料科学研究总院有限公司 | Wet sludge drying method, wet sludge drying drier and cement kiln system |
| CN109405477A (en) * | 2017-08-16 | 2019-03-01 | 万华生态板业股份有限公司 | Drying device |
| CN113073164A (en) * | 2021-04-28 | 2021-07-06 | 河南省煜晟镍业有限责任公司 | Rotary kiln for reduction of nickel iron ore |
| CN115353271A (en) * | 2022-07-15 | 2022-11-18 | 合肥水泥研究设计院有限公司 | Municipal sludge vacuum dehydration treatment system utilizing low-grade waste heat of cement kiln |
-
2009
- 2009-04-27 CN CN200910050098A patent/CN101870549A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173554A (en) * | 2011-01-07 | 2011-09-07 | 袁文献 | System for drying and handling sludge with waste gas from cement production |
| CN102173553A (en) * | 2011-01-07 | 2011-09-07 | 袁文献 | Method for drying and processing sludge by use of cement production waste gas |
| CN102173553B (en) * | 2011-01-07 | 2013-08-21 | 袁文献 | Method for drying and processing sludge by use of cement production waste gas |
| CN102976575A (en) * | 2012-11-29 | 2013-03-20 | 广州市越堡水泥有限公司 | Sludge treatment system and method in cement kiln |
| CN103964668B (en) * | 2014-05-29 | 2015-07-01 | 湖南省建筑材料研究设计院有限公司 | Sludge treatment process equipment and treatment method |
| CN103964668A (en) * | 2014-05-29 | 2014-08-06 | 湖南省建筑材料研究设计院有限公司 | Sludge treatment process equipment and treatment method |
| CN104315844A (en) * | 2014-11-15 | 2015-01-28 | 郭金良 | Process for producing brick by waste heat drying sludge from sintered brick production line tunnel kiln |
| CN104930842A (en) * | 2015-07-14 | 2015-09-23 | 东源辉科建材发展有限公司 | Drying equipment by means of waste heat |
| CN104930842B (en) * | 2015-07-14 | 2017-08-25 | 东源辉科建材发展有限公司 | One kind utilizes residual heat drying device |
| CN105481227A (en) * | 2015-12-25 | 2016-04-13 | 北京建筑材料科学研究总院有限公司 | Wet sludge drying method, wet sludge drying drier and cement kiln system |
| CN109405477A (en) * | 2017-08-16 | 2019-03-01 | 万华生态板业股份有限公司 | Drying device |
| CN113073164A (en) * | 2021-04-28 | 2021-07-06 | 河南省煜晟镍业有限责任公司 | Rotary kiln for reduction of nickel iron ore |
| CN115353271A (en) * | 2022-07-15 | 2022-11-18 | 合肥水泥研究设计院有限公司 | Municipal sludge vacuum dehydration treatment system utilizing low-grade waste heat of cement kiln |
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Application publication date: 20101027 |