CN101643307A - Method for utilizing fume afterheat of cement plant to heat-dry sludge and prepare cement by firing sludge - Google Patents
Method for utilizing fume afterheat of cement plant to heat-dry sludge and prepare cement by firing sludge Download PDFInfo
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Abstract
The invention discloses a method for utilizing fume afterheat of a cement plant to heat-dry sludge and prepares cement by firing sludge. The method comprises the following steps of: respectively sending the fume afterheat discharged by a cement rotary kiln to a first sludge drying and granulating device and a second sludge drying and granulating device, for purpose of two-stage sludge drying; 2) stacking urban sludge in a sludge storage warehouse and carrying out pretreatment prior to the drying; 3) using a component-type feeder to send the pretreated sludge into the first sludge drying and granulating device, for purpose of first-stage sludge drying; 4) using a conveyor to send the sludge after the first-stage sludge drying into the second sludge drying and granulating device, for purposeof second-stage sludge drying; and 5) mixing the sludge subject to two-stage sludge drying with clay and lime material to form raw material, and obtaining the cement by grinding, calcining, cooling and powdering the raw material. In the method, waster materials are used for treating waster materials, so that the urban sludge is harmlessly treated and recycled, and remarkable social and environmental effects can be generated.
Description
Technical field
The present invention relates to a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement.
Background technology
Eleventh Five-Year Plan according to national environmental protection Eleventh Five-Year Plan and processing of national town sewage and regeneration Facilities Construction, all to build sewage treatment facility to all cities of China in 2010, treatment rate of domestic sewage is not less than 70%, estimate that the National urban sewage treatment capacity will be above 100,000,000 ton per days, simultaneously can estimate that the mud of supervening (about water ratio 80%) will be up to 3,000 ten thousand tons/year, add and pollute lake, river dredging mud and municipal sewage system mud etc., not only quantity is very huge for the annual municipal sludge that produces, and annually also increases with 10～15% rate of increase.How safety economy ground treatment and disposal municipal sludge is the environmental problem that the world faces jointly, and it is very urgent especially concerning China to solve this global problem.
Municipal sludge is a kind of pathogeny microorganism, multiple organic and inorganic pollutant of containing, and the solid-liquid mixture of heavy metal, in 192 kinds of compounds that from mud, are detected, there are 99 kinds to be confirmed as hazardous compound, therefore, mud is the great solid waste of a class hazardness, if do not handle completely and control, will cause serious secondary pollution to environment.
At present, China mainly takes the interim method of disposal of burying of piling to sludge from wastewater treatment plant and lake, river dredging mud, not only spend a large amount of funds and take a large amount of land resources, and cause serious secondary pollution to ecotope, particularly ooze under the sewage in the mud, be unable to estimate especially to the harm that groundwater resource bring, and in fact peri-urban can not have space and the place that is fit to stack this class mud, the interim heap of mud buries the harm of the secondary environmental pollution that is produced, and has in fact offset the environmental benefit of the sewage disposal and the training of channel.Face the reality that environmental problem is sharp-pointed day by day and mud harm increasingly sharpens that mud causes, people attempt utilizing the mud as fertilizer sources, be used for agricultural or greening, but, each contained heavy metal species has limited the adaptability that soil utilizes mud in the mud, studies show that, from waste water, remove the heavy metal of 1mg/L, will in mud, accumulate the heavy metal of 10000mg/L, their meeting enrichments in soil, and enter food chain by the absorption of crop, finally jeopardize the health of human body, even some mud is from city domestic sewage, though heavy metal content is lower, but contained pathogenic agent and persistence organic pollutant in the mud, and the various medicaments that add in the sewage treatment process all can bring potential harm to environment.
Practice with reference to external sludge incineration, some places attempt to reach by burning the purpose of mud decrement, still, and sludge incineration facility investment volume height, energy-output ratio is big, working cost costliness, the expense of sludge incineration add that more than 400 yuan/ton mud is when burning, can to atmospheric environment bring pollute and burn after residue reason such as still need dispose, according to the national conditions of China, sludge incineration is handled and is difficult to economically bear, and goes back imperfection technically.
Along with increasing rapidly of China's rapid economy development and urban population, the quantity of municipal effluent is constantly increasing, meanwhile people are more and more higher to the requirement of environmental quality, improving constantly of trade effluent and city domestic sewage processing rate, the quantity that means sludge of sewage treatment plant will grow with each passing day, therefore, open up one municipal sludge carried out safety, economic effective processing approach, imperative.Practice shows that municipal sludge will be handled completely, must walk innoxious, minimizing and resource utilization road.According to physico-chemical property to sludge from wastewater treatment plant, carry out continuous 3 years studies show that, main chemical compositions content in the mud little (table 1), this has illustrated the mud that the municipal sewage plant produces, its main chemical constitution is a kept stable.The loss on ignition of mud is higher, on average reaches about 36%, and the content of full nitrogen and full phosphorus is also higher, and this shows and contains higher organic substance in the mud.Organic content height in the mud, its calorific value is also high, shows by mensuration, and the calorific value of sludge from wastewater treatment plant approaches the calorific value of brown coal, reaches the 1/3-1/2 (table 2) of standard coal calorific value;
The chemical constitution of table 1 sludge from wastewater treatment plant
Table 2 sludge from wastewater treatment plant, dredging mud and burning of coal calorific value
Content organic in lake, the river dredging mud is also higher, and according to the mutual relationship between organism and the calorific value, its calorific value is also than higher.If the heat energy in the mud can be developed, not only can make municipal sludge treatment plant mud and lake, river dredging mud obtain thoroughly handling safely, and the heat energy that mud is had become valuable resource.
If that mud obtains is innoxious, minimizing and recycling treatment, the minimizing of mud is the basis, also is the core place of sludge treatment technology.Sludge of sewage treatment plant and lake, river dredging mud, pass through mechanical dehydration, water ratio is generally between 75%-85%, can be fully used if make the calorific value of mud, must be at first the water ratio of mud be reduced, make the solid content of mud reach 100%, this means needs a large amount of external energies, the calculating that is based upon on the experimental basis shows, will be with the complete after-flame of the mud of water ratio 75%-85%, make mud arrive the needed energy of burning-point, the energy that is produced much larger than the over dry sludge incineration.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement is provided.
A kind of method of cement mill smoke residual heat to dry sludge and firing sludge cement of utilizing comprises the steps:
1) the fume afterheat temperature that cement rotary kiln kiln tail boiler of power generation by waste heat is discharged is 190 ℃～220 ℃ a hot flue gas, control exhaust gas volumn with air door, deliver to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, carry out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～85% sludge of sewage treatment plant, or lake, river dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding pre-treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out first section sludge drying;
4) through the mud of first section mummification,, send into the second sludge drying granulating apparatus, carry out second section sludge drying by transfer roller;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling;
6) the cooled mud granule water content mass percent that accounts for total mass reduces to 15%～25%, this mud granule and clayey raw material are 30～50% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material, this mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material.Raw material by mill, calcine, after the cooling, grinding, cement.
A kind of method of cement mill smoke residual heat to dry sludge and firing sludge cement of utilizing comprises the steps:
1) the fume afterheat temperature that cement rotary kiln kiln tail is discharged is 350 ℃～360 ℃ a hot flue gas, controls exhaust gas volumn with air door, delivers to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, carries out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～80% sludge from wastewater treatment plant, or lake, river dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding pre-treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out first section sludge drying;
4) through the mud of first section mummification,, send into the second sludge drying granulating apparatus, carry out second section sludge drying by transfer roller;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling.
6) the cooled mud granule water content mass percent that accounts for total mass is for reducing to 15%～20%, and this mud granule and clayey raw material are 30～50% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material.Raw material by mill, calcine, after the cooling, grinding, cement.
A kind of method of cement mill smoke residual heat to dry sludge and firing sludge cement of utilizing comprises the steps:
1) the fume afterheat temperature that the cement rotary kiln kiln hood is discharged is 120 ℃～130 ℃ a hot flue gas, controls exhaust gas volumn with air door, delivers to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, carries out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～80% sludge from wastewater treatment plant, or lake, river dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding pre-treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out first section sludge drying;
4) through the mud of first section mummification,, send into the second sludge drying granulating apparatus, carry out second section sludge drying by transfer roller;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling.
6) the cooled mud granule water content mass percent that accounts for total mass is for reducing to 20%～30%, and this mud granule and clayey raw material are 30～60% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material, raw material by mill, calcine, after the cooling, grinding, cement.
The barrel diameter of the described first sludge drying granulating apparatus is 2.0～2.4m, and length is 22～28m.The barrel diameter of the described second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m, is equipped with in the cylindrical shell of the first sludge drying granulating apparatus and the second sludge drying granulating apparatus mud is further disperseed and to help the granulated material delivering plate of mud and chain hammer.
Described through discharge tail gas after first section mummification and the second section mummification, through qualified discharge after the dedusting degassing processing; The gas that pre-treatment and mud stockyard discharge before the sludge drying is eliminated by biological soil filter bed or biological filter.
The present invention compared with prior art has beneficial effect:
1) utilizes the cement mill smoke residual heat to dry sludge, not only can be under the situation that does not consume new forms of energy, the water ratio of sludge of sewage treatment plant and lake, river dredging mud is reduced, and cement sintering process discharged flue gas waste heat is fully used, thereby opened up the new way of a treatment of wastes with processes of wastes against one another, the cyclic utilization of waste for innoxious, minimizing, the recycling treatment of municipal sludge, significant social and environmental benefit can either be produced, tangible economic benefit can be obtained again;
2) utilize the cement mill smoke residual heat to dry sludge, because thermal source is taken from cement mill boiler of power generation by waste heat discharged flue gas waste heat or direct discharged flue gas waste heat, therefore, not only can not influence the normal operation of manufacture of cement and boiler of power generation by waste heat, and wet mud can adsorb dust and part sulfurous gas in the flue gas, the minimizing air pollution emission;
3) the present invention utilizes the cement mill fume afterheat, make mud under cold condition, obtain mummification, thereby kept mud primary calorific value, mud is as the auxiliary material of cement after the mummification, in the cement sintering process, can contribute calorific value, sludge from wastewater treatment plant and lake, river dredging mud is handled completely, the heat resource of mud is farthest utilized.
Description of drawings
Fig. 1 utilizes the smoke residual heat to dry sludge of cement rotary kiln kiln tail boiler of power generation by waste heat discharge and the process flow sheet of firing sludge cement;
Fig. 2 utilizes the smoke residual heat to dry sludge of cement rotary kiln kiln tail discharge and the process flow sheet of firing sludge cement;
Fig. 3 utilizes the smoke residual heat to dry sludge of cement rotary kiln kiln hood discharge and the process flow sheet of firing sludge cement.
Embodiment
The present invention utilizes cement mill discharged flue gas waste heat, earlier with sludge drying, then, with the raw material of the mud after the mummification as firing silicate cement cement.The main component of silicate cement is tricalcium silicate (3CaOSiO2), Dicalcium Phosphate (Feed Grade) (2CaOSiO
2), tricalcium aluminate (3CaOAI
2O
3), tetracalcium aluminoferrite (4CaOAI
2O
3Fe
2O
3), wherein CaO 62～67%; SiO
220～24%; AI
2O
34～7%; Fe
2O
32～6%.The main raw material of producing silicate cement has calcareous raw material and clayey raw materials such as loess, clay, shale, mud stone, siltstone and river silt such as Wingdale, chalk, calcium carbonate muddy limestone, shell, in one ton of grog, need 0.3～0.4 ton of clayey raw material approximately, account for 11～17% at raw material medium clay soil raw material.Table 3 provides the main chemical compositions in clayey raw material and the sludge ash, can see from table 3, and the main inorganic composition of sludge ash and clayey raw material are very approaching, and therefore, the mud after the mummification can be used as the auxiliary material of producing silicate cement fully.This for realize that municipal sludge is innoxious completely, minimizing and recycling treatment open up a new way.
Main chemical compositions in table 3 clayey raw material and the sludge ash
First kind is utilized the method for cement mill smoke residual heat to dry sludge and firing sludge cement to comprise the steps:
1) the fume afterheat temperature that cement rotary kiln kiln tail boiler of power generation by waste heat is discharged is 190 ℃～220 ℃ a hot flue gas, control exhaust gas volumn with air door, deliver to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, for the two-section type sludge drying provides heat, carry out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～85% sludge of sewage treatment plant, or lake, river dredging mud, stacked 3～5 days at the mud storage vault, and with the pre-treatment of turning over before the machine that mixes carries out sludge drying, make the mud homogenizing of different sources on the one hand, make mud spontaneous evaporation portion of water on the other hand;
3) will be through pretreated mud, by the component type charger, mud is sent into the first sludge drying granulating apparatus by certain time interval, carry out first section sludge drying, water ratio is that 73～83% mud directly contacts hot flue gas heating mud with hot flue gas, make the part water evaporates in the mud, and drain with flue gas, through the mud after first section mummification, water ratio reduces to 56%～63%;
4) through the mud of first section mummification, pass through worm conveyor, send into the second sludge drying granulating apparatus, carry out second section sludge drying, water ratio is that 56%～63% mud directly contacts with hot flue gas, and hot flue gas heats mud once more, make the part water evaporates in the mud, and drain with flue gas, through the mud after second section mummification, water ratio reduces to 40%～45%;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling, and in mud granule refrigerative process, further dehydration;
6) the cooled mud granule water content mass percent that accounts for total mass reduces to 15%～25%, this mud granule and clayey raw material are 30～50% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material, this mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material.Raw material by mill, calcine, after the cooling, grinding, cement.
The barrel diameter of the first sludge drying granulating apparatus is 2.0～2.4m, length is 22～28m, the barrel diameter of the second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m, is equipped with in the cylindrical shell of the first and second sludge drying granulating apparatus mud is further disperseed and to help the granulated material delivering plate of mud and chain hammer.
Mud is through discharge tail gas after first section and the second section mummification, through qualified discharge after the dedusting degassing processing; The gas that pre-treatment and mud stockyard discharge before the sludge drying is eliminated by biological soil filter bed or biological filter.
Second kind is utilized the method for cement mill smoke residual heat to dry sludge and firing sludge cement to comprise the steps:
1) the fume afterheat temperature that cement rotary kiln kiln tail is discharged is 350 ℃～360 ℃ a hot flue gas, control exhaust gas volumn with air door, deliver to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, for the two-section type sludge drying provides heat, carry out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～85% sludge from wastewater treatment plant, or lake, river dredging mud, stacked 3～5 days at the mud storage vault, and with the pre-treatment of turning over before the machine that mixes carries out sludge drying, make the mud homogenizing of different sources on the one hand, make mud spontaneous evaporation portion of water on the other hand;
3) will be through pretreated mud, by the component type charger, mud is sent into the first sludge drying granulating apparatus by certain time interval, carry out first section sludge drying, water ratio is that 73～83% mud directly contacts hot flue gas heating mud with hot flue gas, make the part water evaporates in the mud, and drain with flue gas, through the mud after first section mummification, water ratio reduces to 55%～60%;
4) through the mud of first section mummification, pass through worm conveyor, send into the second sludge drying granulating apparatus, carry out second section sludge drying, water ratio is that 55%～60% mud directly contacts with hot flue gas, and hot flue gas heats mud once more, make the part water evaporates in the mud, and drain with flue gas, through the mud after second section mummification, water ratio reduces to 35%～40%;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling, and in mud granule refrigerative process, further dehydration;
6) the cooled mud granule water content mass percent that accounts for total mass is for reducing to 15%～20%, and this mud granule and clayey raw material are 30～50% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material.Raw material by mill, calcine, after the cooling, grinding, cement.
The barrel diameter of the first sludge drying granulating apparatus is 2.0～2.4m, length is 22～28m, the barrel diameter of the second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m, is equipped with in the cylindrical shell of the first and second sludge drying granulating apparatus mud is further disperseed and to help the granulated material delivering plate of mud and chain hammer.
Mud is through discharge tail gas after first section and the second section mummification, through qualified discharge after the dedusting degassing processing; The gas that pre-treatment and mud stockyard discharge before the sludge drying is eliminated by biological soil filter bed or biological filter.
The third utilizes the method for cement mill smoke residual heat to dry sludge and firing sludge cement to comprise the steps:
1) the fume afterheat temperature that the cement rotary kiln kiln hood is discharged is 120 ℃～130 ℃ a hot flue gas, control exhaust gas volumn with air door, deliver to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, for the two-section type sludge drying provides heat, carry out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～80% sludge from wastewater treatment plant, or lake, river dredging mud, stacked 3～5 days at the mud storage vault, and with the pre-treatment of turning over before the machine that mixes carries out sludge drying, make the mud homogenizing of different sources on the one hand, make mud spontaneous evaporation portion of water on the other hand;
3) will be through pretreated mud, by the component type charger, mud is sent into first sludge drying by certain time interval become three devices of bifurcation, carry out first section sludge drying, water ratio is that 73～82% mud directly contacts hot flue gas heating mud with hot flue gas, make the part water evaporates in the mud, and drain with flue gas, through the mud after first section mummification, water ratio reduces to 60%～65%;
4) through the mud of first section mummification, pass through worm conveyor, send into the second sludge drying granulating apparatus, carry out second section sludge drying, water ratio is that 60%～65% mud directly contacts with hot flue gas, and hot flue gas heats mud once more, make the part water evaporates in the mud, and drain with flue gas, through the mud after second section mummification, water ratio reduces to 43%～45%;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling, and in mud granule refrigerative process, further dehydration;
6) the cooled mud granule water content mass percent that accounts for total mass is for reducing to 20%～30%, and this mud granule and clayey raw material are 30～60% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material, raw material by mill, calcine, after the cooling, grinding, cement.
The barrel diameter of the first sludge drying granulating apparatus is 2.0～2.4m, length is 22～28m, the barrel diameter of the second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m, is equipped with in the cylindrical shell of the first and second sludge drying granulating apparatus mud is further disperseed and to help the granulated material delivering plate of mud and chain hammer.
Mud is through discharge tail gas after first section and the second section mummification, through qualified discharge after the dedusting degassing processing; The gas that pre-treatment and mud stockyard discharge before the sludge drying is eliminated by biological soil filter bed or biological filter.
Special-purpose mud waggon is that 80% sludge from wastewater treatment plant is sent into the mud storage vault with water ratio, stacked 4 days, and mix machine and make the mud homogenizing on the one hand with turning over, make mud spontaneous evaporation portion of water on the other hand, the mud storage vault discharges gas, send into the biological filter by induced draft fan, qualified discharge.
Through pretreated mud, water ratio reduces to 78%, by the component type charger, mud is sent into the first sludge drying granulating apparatus by certain time interval, carry out the fs sludge drying, the barrel diameter of the first sludge drying granulating apparatus is 2.2m, long is 24m, the fume afterheat temperature that induced draft fan is discharged cement rotary kiln kiln tail boiler of power generation by waste heat is 200 ℃ a hot flue gas, by air door control air quantity, send into the first sludge drying granulating apparatus and water ratio and be 78% mud and directly contact, hot flue gas heating mud makes the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, by induced draft fan, through wet dust removal air-removal equipment, qualified discharge.Through the mud after first section mummification, water ratio reduces to 58%.
Will be through the mud of first section mummification, pass through worm conveyor, send into the second sludge drying granulating apparatus, carry out second section sludge drying, the barrel diameter of the second sludge drying granulating apparatus is 2.0m, long is 20m, the fume afterheat temperature that induced draft fan is discharged cement rotary kiln kiln tail boiler of power generation by waste heat is 200 ℃ a hot flue gas, by air door control air quantity, sends into the second sludge drying granulating apparatus and water ratio and is 58% mud and directly contact, hot flue gas heats mud once more, make the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, passes through induced draft fan, through wet dust removal air-removal equipment, qualified discharge.Through the mud after second section mummification, water ratio reduces to 40%.
Mud is through above-mentioned two-section type drying process, and mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, in mud granule refrigerative process, and further dehydration.After refrigerative mud granule water ratio reduces to 20%, with clayey raw material with 30～50% mixed, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material form raw material with 11%～17% mixed.Raw material by mill, calcine, after the cooling, grinding, cement.
Embodiment 2
Special-purpose mud waggon is that 78% sludge from wastewater treatment plant is sent into the mud storage vault with water ratio, stacked 3 days, and mix machine and make the mud homogenizing on the one hand with turning over, make mud spontaneous evaporation portion of water on the other hand, the mud storage vault discharges gas, send into the biological filter by induced draft fan, qualified discharge.
Through pretreated mud, water ratio reduces to 77%, by the component type charger, mud is sent into the first sludge drying granulating apparatus by certain time interval, carry out first section sludge drying, the barrel diameter of the first sludge drying granulating apparatus is 2.0m, and long is 22m, and the fume afterheat temperature that induced draft fan is discharged cement rotary kiln kiln tail is 350 ℃ a hot flue gas, by air door control air quantity, send into the first sludge drying granulating apparatus and water ratio and be 77% mud and directly contact, hot flue gas heating mud makes the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, by induced draft fan, through wet dust removal air-removal equipment, qualified discharge.Through the mud after first section mummification, water ratio reduces to 56%.
Will be through the mud of first section mummification, pass through worm conveyor, send into the second sludge drying granulating apparatus, carry out second section sludge drying, the barrel diameter of the second sludge drying granulating apparatus is 1.8m, long is 20m, the fume afterheat temperature that induced draft fan is discharged cement rotary kiln kiln tail is 350 ℃ a hot flue gas, by air door control air quantity, sends into the second sludge drying granulating apparatus and water ratio and is 56% mud and directly contact, hot flue gas heats mud once more, make the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, passes through induced draft fan, through wet dust removal air-removal equipment, qualified discharge.Through the mud after second section mummification, water ratio reduces to 36%.
Mud is through above-mentioned two-section type drying process, and mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, in mud granule refrigerative process, and further dehydration.After refrigerative mud granule water ratio reduces to 18%, with clayey raw material with 30～50% mixed, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material form raw material with 11%～17% mixed.Raw material by mill, calcine, after the cooling, cement grinding mill, cement.
Embodiment 3
Special-purpose mud waggon is that 76% sludge from wastewater treatment plant is sent into the mud storage vault with water ratio, stacked 5 days, and mix machine and make the mud homogenizing on the one hand with turning over, make mud spontaneous evaporation portion of water on the other hand, the mud storage vault discharges gas, send into the biological filter by induced draft fan, qualified discharge.
Through pretreated mud, water ratio reduces to 75%, by the component type charger, mud is sent into the first sludge drying granulating apparatus by certain time interval, carry out the fs sludge drying, the barrel diameter of the first sludge drying granulating apparatus is 2.4m, and long is 26m, and the fume afterheat temperature that induced draft fan is discharged the cement rotary kiln kiln hood is 120 ℃ a hot flue gas, by air door control air quantity, send into the first sludge drying granulating apparatus and water ratio and be 75% mud and directly contact, hot flue gas heating mud makes the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, by induced draft fan, through wet dust removal air-removal equipment, qualified discharge.Through the mud after first section mummification, water ratio reduces to 62%.
Will be through the mud of first section mummification, pass through worm conveyor, send into the second sludge drying granulating apparatus, carry out second section sludge drying, the barrel diameter of the second sludge drying granulating apparatus is 2.2m, long is 24m, the fume afterheat temperature that induced draft fan is discharged the cement rotary kiln kiln hood is 120 ℃ a hot flue gas, by air door control air quantity, sends into the second sludge drying granulating apparatus and water ratio and is 62% mud and directly contact, hot flue gas heats mud once more, make the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, passes through induced draft fan, through wet dust removal air-removal equipment, qualified discharge.Through the mud after second section mummification, water ratio reduces to 45%.
Mud is through above-mentioned two-section type drying process, and mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, in mud granule refrigerative process, and further dehydration.After refrigerative mud granule water ratio reduces to 30%, with clayey raw material with 55% mixed, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material form raw material with 11%～17% mixed.Raw material by mill, calcine, after the cooling, grinding, cement.
Claims (10)
1. a method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement is characterized in that comprising the steps:
1) the fume afterheat temperature that cement rotary kiln kiln tail boiler of power generation by waste heat is discharged is 190 ℃～220 ℃ a hot flue gas, control exhaust gas volumn with air door, deliver to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, carry out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～85% sludge of sewage treatment plant, or lake, river dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding pre-treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out first section sludge drying;
4) through the mud of first section mummification,, send into the second sludge drying granulating apparatus, carry out second section sludge drying by transfer roller;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling;
6) the cooled mud granule water content mass percent that accounts for total mass reduces to 15%～25%, this mud granule and clayey raw material are 30～50% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material, this mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material.Raw material by mill, calcine, after the cooling, grinding, cement.
2. a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement according to claim 1, the barrel diameter that it is characterized in that the described first sludge drying granulating apparatus is 2.0～2.4m, length is 22～28m.
3. a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement according to claim 1, the barrel diameter that it is characterized in that the described second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m, is equipped with in the cylindrical shell of the first sludge drying granulating apparatus and the second sludge drying granulating apparatus mud is further disperseed and to help the granulated material delivering plate of mud and chain hammer.
4. a method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement is characterized in that comprising the steps:
1) the fume afterheat temperature that cement rotary kiln kiln tail is discharged is 350 ℃～360 ℃ a hot flue gas, controls exhaust gas volumn with air door, delivers to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, carries out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～85% sludge from wastewater treatment plant, or lake, river dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding pre-treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out first section sludge drying;
4) through the mud of first section mummification,, send into the second sludge drying granulating apparatus, carry out second section sludge drying by transfer roller;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling.
6) the cooled mud granule water content mass percent that accounts for total mass is for reducing to 15%～20%, and this mud granule and clayey raw material are 30～50% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material.Raw material by mill, calcine, after the cooling, grinding, cement.
5. a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement according to claim 4, the barrel diameter that it is characterized in that the described first sludge drying granulating apparatus is 2.0～2.4m, length is 22～28m.
6. a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement according to claim 4, the barrel diameter that it is characterized in that the described second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m, is equipped with in the cylindrical shell of the first sludge drying granulating apparatus and the second sludge drying granulating apparatus mud is further disperseed and to help the granulated material delivering plate of mud and chain hammer.
7. a method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement is characterized in that comprising the steps:
1) the fume afterheat temperature that the cement rotary kiln kiln hood is discharged is 120 ℃～130 ℃ a hot flue gas, controls exhaust gas volumn with air door, delivers to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by induced draft fan, carries out the two-section type sludge drying;
2) mass percent that water content is accounted for total mass is 75～85% sludge from wastewater treatment plant, or lake, river dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding pre-treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out first section sludge drying;
4) through the mud of first section mummification,, send into the second sludge drying granulating apparatus, carry out second section sludge drying by transfer roller;
5) through first section sludge drying and second section sludge drying, mud is in mummification, and forming particle diameter naturally is the mud granule of 1～8mm, and mud granule enters stockyard, cooling.
6) the cooled mud granule water content mass percent that accounts for total mass is for reducing to 20%～30%, and this mud granule and clayey raw material are 30～60% to mix with the mass percent that accounts for total mass, form mud-clay matter mixing raw material.This mixing raw material and calcareous raw material are 11%～17% to mix with the mass percent that accounts for total mass, form raw material, raw material by mill, calcine, after the cooling, grinding, cement.
8. a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement according to claim 7, the barrel diameter that it is characterized in that the described first sludge drying granulating apparatus is 2.0～2.4m, length is 22～28m.
9. a kind of method of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement according to claim 7, the barrel diameter that it is characterized in that the described second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m, is equipped with in the cylindrical shell of the first sludge drying granulating apparatus and the second sludge drying granulating apparatus mud is further disperseed and to help the granulated material delivering plate of mud and chain hammer.
10. according to claim 1,4 or 7 described a kind of methods of utilizing cement mill smoke residual heat to dry sludge and firing sludge cement, it is characterized in that described through discharge tail gas after first section mummification and the second section mummification, through qualified discharge after the dedusting degassing processing; The gas that pre-treatment and mud stockyard discharge before the sludge drying is eliminated by biological soil filter bed or biological filter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102190413A (en) * | 2011-03-24 | 2011-09-21 | 华新环境工程有限公司 | Method of integratedly utilizing sludge pretreatment and cement kiln, and system thereof |
| CN103435244A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Parallel sludge low-temperature drying method utilizing waste heat of flue gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294091C (en) * | 2005-01-21 | 2007-01-10 | 浙江大学 | Method for drying sludge by residual heat from boiler fume |
| CN100336752C (en) * | 2006-05-30 | 2007-09-12 | 浙江大学 | Circulation-type energy-saving sludge drying method |
| CN101265009B (en) * | 2008-04-09 | 2011-05-18 | 浙江大学 | Clean energy-saving sludge drying method for reclaiming and utilizing tail gas residual heat |
| CN101274813B (en) * | 2008-05-09 | 2010-06-09 | 浙江大学 | Tail gas waste heat recovery and reutilization sludge drying system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102190413A (en) * | 2011-03-24 | 2011-09-21 | 华新环境工程有限公司 | Method of integratedly utilizing sludge pretreatment and cement kiln, and system thereof |
| CN102190413B (en) * | 2011-03-24 | 2012-07-04 | 华新环境工程有限公司 | Method of integratedly utilizing sludge pretreatment and cement kiln, and system thereof |
| CN103435244A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Parallel sludge low-temperature drying method utilizing waste heat of flue gas |
| CN103435244B (en) * | 2013-08-12 | 2014-12-31 | 浙江大学 | Parallel sludge low-temperature drying method utilizing waste heat of flue gas |
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