CN103626374A - Granulation drying method for wet sludge - Google Patents
Granulation drying method for wet sludge Download PDFInfo
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- CN103626374A CN103626374A CN201210310246.XA CN201210310246A CN103626374A CN 103626374 A CN103626374 A CN 103626374A CN 201210310246 A CN201210310246 A CN 201210310246A CN 103626374 A CN103626374 A CN 103626374A
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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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention relates to a granulation drying method for wet sludge, wherein the concrete measures comprise that: based on wet sludge flowability, anhydration and granulation are concurrently performed so as to carry out multiple granulations on wet sludge, energy consumption adopts boiler flue gas or waste heat air, one-time high-quality fuel addition is not required, and dry sludge backmixing is not required. The granulation drying method comprises that: a, sludge drying is started; b, wet sludge enters a granulation drying apparatus material discharge hopper; c1, granulation is performed through a first granulation roller, and the obtained material enters a first drying chamber, and falls down through scrapping plate flipping; d1, the water content in the current wet sludge is detected and read, the step e is performed if the water content in the current sludge is less than the set value, and the operation returns to the step b if the water content in the current sludge is more than the set value; and e, sludge granulation anhydration is completed. The granulation drying method is characterized in that the traditional method that drying and granulation are independent is broken through, and drying and granulation are performed in a cross manner in stages so as to significantly reduce the energy consumption and the time required by sludge anhydration and the temperature requirement of the required heat source.
Description
Technical field
The present invention relates to a kind of granulating and drying method for wet mud, particularly relate to the combination intersected with each other of a kind of granulation process and drying process, effective granulating and drying method that improves wet drying sludge efficiency and reduce energy expenditure.
Background technology
In the current treating processes of wet mud, often bias toward " being dried ", and ignore " granulation ".Its major cause is mainly that wet mud is difficult to granulation, therefore separate out by improving its dry temperature required moisture evaporation of strengthening in wet mud.This will consume a large amount of primary energy source undoubtedly.
In factory, there is the waste gas of a large amount of 90 ℃-300 ℃, in printing and dyeing enterprise, exist a large amount of boiler exhaust gas, forming machine used heat.In sludge dry system, adopting high-temperature flue gas to carry out the larger problem of technology ubiquity of drying sludge, is mainly to adopt high temperature drying, and the toxic and harmful in mud is decomposited in a large number, causes serious secondary pollution; Directly and mud contact drying, a large amount of gases after dry can not enter boiler combustion, produce huge vent gas treatment cost; Or be dried through after heat exchange, because temperature after dry is low, can not reuse inefficiency; If this part high-temp waste gas carries out direct discharge meeting, environment is caused to serious thermal pollution.How effectively to utilize this part high-temp waste gas to become the current major issue facing.
On the other hand, some industry mud are because density is little, and water ratio is large, are easy to agglomerating difficult dispersion; As dyeing, the composition of mud has determined that himself thermal resistance is higher, is difficult to effectively the heat of working medium air is sent to mud inside, and inner moisture is also difficult for coming out.If can effectively utilize the low-temperature waste heat in industrial production, and can efficiently process and be difficult to like this wet mud that is dried, be problem demanding prompt solution.
Summary of the invention
The present invention is just based on overcoming the above problems, and creatively must not adopt high-temperature flue gas to carry out sludge drying in conjunction with granulation and drying process, and use the middle low-temperature flue gas of 85-150 ℃ instead, carries out, and finds that the toxic and harmful content in its tail vapour significantly reduces.After mummification, moisture percentage is controlled at 20-40%, can be directly used in the burning after sludge drying.The inventive method realizes the area while significantly increasing sludge drying by granulation, and and drying process combination, in the short period of time, remove its contained humidity.Long-pending in more than 80% Sludge Surface by increasing water capacity, and mud internal junction Heshui becomes surface water fast, the economic convenient mud upset of accelerating, has solved the key issue that in mud drying process, energy consumption is high, working cost is high and treatment capacity is low.
Object of the present invention is exactly in order to solve the above-mentioned problem, a kind of granulating and drying method for wet mud is provided, surface-area while realizing sludge drying maximizes, and the different qualities showing in the drying process in conjunction with wet mud, utilize various setting devices to increase the shape outside surface of mud after mummification simultaneously, reduce its water capacity, to realize by minimum energy consumption, recycle the dewatered sludge that can burn rapidly.For realizing the device of the object of the invention, mainly comprise lower funnel 2, the first granulation cylinder 1, the first drying chamber 7, travelling belt 6, blanking scraper plate 4, this granulating and drying method comprises the following steps successively:
A, drying sludge start;
B, wet mud enter funnel under Granulating and Drying Apparatus for Wet Powder Body and Liquid;
C1, through the first granulation cylinder granulation (c11), and enter the first drying chamber (c12), by the upset of blanking scraper plate drop (c13);
D1, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc1; When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operation e; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to b;
E, mud granulizing have been dried.
Further comprising the steps of between described step a and step b:
C0, external dehydration;
D0, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc0; When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operation b; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to c0.
Further comprising the steps of between described step c1 and steps d 1:
C2, through the second granulation cylinder granulation (c21), and enter the second drying chamber (c22), by the upset of blanking scraper plate drop (c23).
Further comprising the steps of between described steps d 1 and step e:
C3, through mud gauge control bar first pressing (c31), and enter the 3rd drying chamber (c32), by the upset of blanking scraper plate drop (c33).
Further comprising the steps of between described step c3 and step e:
D2, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc2; When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operation e; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to c3.
Further comprising the steps of between described step c3 and steps d 2:
C4, through mud thickness final pressure control lever final pressure (c41), and enter the 4th drying chamber (c42), by the upset of blanking scraper plate drop (c43).
During described use the first granulation cylinder 1 granulation, the water ratio of wet mud need remain on 50%-80%; Wet moisture percentage in sewage sludge is higher, and the air wind speed in wind pushing box 16 is higher, and temperature is lower; Wet moisture percentage in sewage sludge is lower, and the air wind speed in wind pushing box 16 is lower, temperature is higher; Atmospheric moisture is 5%-30%, and temperature is 85 ℃-150 ℃, and wind speed is 10 meter per second-30 meter per seconds.
During described use mud thickness first pressing control lever 9, the water ratio of wet mud need remain on 20%-50%; Wet moisture percentage in sewage sludge is higher, and the air wind speed in wind pushing box 16 is higher, and temperature is lower; Wet moisture percentage in sewage sludge is lower, and the air wind speed in wind pushing box 16 is lower, temperature is higher; Atmospheric moisture is 5%-30%, and temperature is 85 ℃-150 ℃, and wind speed is 10 meter per second-20 meter per seconds.
Described detection is also read current wet moisture percentage in sewage sludge, be by timing acquiring through the drop mud sample of travelling belt 6 of blanking scraper plate 4 upset, carry out the mensuration of water ratio, or by the water ratio of the current mud of weight induction device 10 metering.
Described drying chamber can arrange in pairs, meets wet mud import 14 and dewatered sludge outlet 15 is positioned at the same side; Also can become odd number to arrange, satisfied wet mud import 14 and dewatered sludge outlet 15 are positioned at not homonymy; The devices such as the first granulation cylinder 1 in drying chamber or mud thickness first pressing control lever 9 are arranged and are adjusted accordingly with drying chamber.
The mud that the present invention can be effectively 40-95% to water capacity carries out the granulation of different-grain diameter, and can carry out secondary, three granulations for the different moisture percentages of contained mud in different municipal sludges, industrial sludge, granularity size, density etc., the granulation of wet mud, can effectively promote to strengthen its dry process; And after drying sludge, can be conducive to again its further granulation.The two is organically combined, can eliminate wet mud and be difficult to double predicament dry and that be difficult to granulation.In employing factory, low temperature waste gas is as main energy sources, can effectively utilize the energy in plant gas to carry out sludge drying on the one hand, on the other hand, adopt the sludge drying after this prilling process, the tail vapour harmful substance content of discharging declines to a great extent, and its running cost significantly reduces owing to adopting waste gas, and the dewatered sludge of its production can be directly used in burning, or other resource utilizations, recovery energy, obtain free resource.
Accompanying drawing explanation
Fig. 1 is a kind of granulating and drying method flow diagram for wet mud of the embodiment of the present invention one;
Fig. 2 is the granulating and drying method flow diagram of the high humidity mud of the embodiment of the present invention two;
Fig. 3 is the granulating and drying method flow diagram of the high humidity mud of the embodiment of the present invention three;
Fig. 4 is the granulating and drying method flow diagram of the high humidity mud of the embodiment of the present invention four;
Fig. 5 is the granulating and drying method flow diagram of the high humidity mud of the embodiment of the present invention five;
Fig. 6 is the granulating and drying method flow diagram of the high humidity mud of the embodiment of the present invention six;
Fig. 7 is for realizing a kind of Granulating and Drying Apparatus for Wet Powder Body and Liquid figure for wet mud of the object of the invention.
Wherein: 1 is the first granulation cylinder; 2 is lower funnel; 3 is cylinder scraper plate; 4 is blanking scraper plate; 5 is the second granulation cylinder; 6 is travelling belt; 7 is the first drying chamber; 8 is the second drying chamber; 9 is that mud thickness first pressing control lever 10 is gravity sensing device; 11 is the 3rd drying chamber; 12 is mud thickness final pressure control lever; 13 is the 4th drying chamber; 14 is wet mud entrance; 15 is dewatered sludge outlet; 16 is wind pushing box; 17 is air outlet.
Specific embodiment is described
Embodiment mono-
As shown in Figure 1, be the granulating and drying method flow diagram of the wet mud of the present embodiment.When wet mud is carried out to granulating and drying, comprise the following steps successively:
A, drying sludge start;
B, wet mud enter funnel 2 under Granulating and Drying Apparatus for Wet Powder Body and Liquid;
C1, through the first granulation cylinder 1 granulation (step c11), and enter the first drying chamber 7 (step c12), by 4 upsets of blanking scraper plate drop (step c13);
D1, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc1; When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operation e; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to b;
E, mud granulizing have been dried.
Concrete from function, in whole drying process, wet mud dry air in the wind pushing box 16 through being covered with air outlet 17 on travelling belt 6, travelling belt 6 gait of march in cavity are different with air parameter in wind pushing box 16.
Step b, wet mud enters funnel 2 under Granulating and Drying Apparatus for Wet Powder Body and Liquid.Lower funnel 2 is only that wet mud is done a deposit before granulation action, to guarantee that wet mud can uniform, successively must enter the first granulation cylinder 1 granulation.Wet moisture percentage in sewage sludge now generally remains on more than 80%, and the wet mud higher than 80% is difficult to be stored in lower funnel 2.
Step c1, is subdivided into three little steps, is respectively step c11 through the first granulation cylinder 1 granulation, step c12 and enters the first drying chamber 7 and step c13 is dropped by 4 upsets of blanking scraper plate, and step c2 below and step c3 situation are similar.Step c1 is specially, through the first granulation cylinder 1 granulation (step c11), moisture percentage in sewage sludge is now also unchanged, only on body, to be divided into particle diameter to be not more than heap shape or the strip that 10mm, length are not more than 50mm, and enter the first drying chamber 7 (step c12), starting to accept temperature that air outlet 17 blows out and be 80 ℃ of above, humidity is the warm air drying below 30%.Wet mud, need be at the interior stop setup times of the first drying chamber 7 in the traveling process of travelling belt 6, and this gait of march by travelling belt 6 is controlled.Wet moisture percentage in sewage sludge is higher, and the air wind speed in wind pushing box 16 is higher, and temperature is lower; Wet moisture percentage in sewage sludge is lower, and the air wind speed in wind pushing box 16 is lower, temperature is higher; Atmospheric moisture is 5%-30%, and temperature is 85 ℃-150 ℃, and wind speed is 10 meter per second-30 meter per seconds.Through the first granulation cylinder 1 granulation and the first drying chamber 7 inner dryings, water ratio can decline gradually, and the water ratio of pressing close to the wet mud of one side of travelling belt 6 changes less.Final wet mud is dropped (step c13) by 4 upsets of blanking scraper plate, enters lower one deck drying chamber.
Steps d 1, detects and reads current wet moisture percentage in sewage sludge, and judges whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc1.By timing acquiring, through the drop mud sample of travelling belt 6 of blanking scraper plate 4 upset, carry out the mensuration of water ratio.Its acquisition interval is less than or equal to the timed interval that wet mud enters lower funnel 2, generally sets 20-60 minute.The water ratio of the current mud of weight induction device 10 metering that also can be by each drying chamber, compares with the initial weight of mud, obtains the water ratio of mud by both relation.
When current moisture percentage in sewage sludge is less than or equal to set(ting)value mc1, operating procedure e, mud granulizing has been dried; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to step b.When wet moisture percentage in sewage sludge in step b is lower, through the first granulation cylinder 1 granulation and the dried mud of the first drying chamber 7, if reach required set(ting)value (if mud is for burning, this set(ting)value is 20-40%), finish mud granulizing drying process; When wet moisture percentage in sewage sludge in step b is higher, after the first drying chamber 7, what only can acquire a certain degree is dry, and the surface water of its wet mud is drying substantially, but innerly still keeps original original state.In steps d 1, if its value is greater than set(ting)value, now wet mud is not in good state, and need return to step b row granulation and dry again.
Step e, mud granulizing mummification completes.
Wet moisture percentage in sewage sludge is 60%-80% when above, and the temperature of the air parameter of employing is 80 ℃; When moisture percentage in sewage sludge is 30%-60%, the temperature of the air parameter of employing is 120 ℃; When moisture percentage in sewage sludge is less than 30%, the temperature of the air parameter of employing is 150 ℃.Water ratio, be that more than 80% wet drying sludge becomes the dewatered sludge of water ratio below 20%, approximately need 30 minutes.And by the combination of granulation and drying mode, the granulation time used is included in drying process, and to be less than time of drying completely by the air heating of the 80 ℃ time used, be also less than with the air heating of the 120 ℃ time used simultaneously.Meanwhile, utilized fully the air of 80 ℃, the shared time surpasses half,, about 15 minutes, has reduced the most of the time and has heated needed cost.
And what is more important, the air source of 80 ℃ is numerous, as boiler tail vapour, stove cellar for storing things tail vapour, sizing tail vapour etc., can be used as the free energy and reclaims use, carrys out dry wet mud.
Embodiment bis-
The present embodiment two is with the difference of embodiment mono-, and as shown in Figure 2, before wet mud enters lower funnel 2, increased step c0 and steps d 0, other flow processs are constant.Existing description in embodiment mono-, when wet moisture percentage in sewage sludge is higher than 80% time, wet mud cannot store in lower funnel 2, more cannot carry out granulation by the first granulation cylinder 1, and wet mud mobility is now excessive, can directly by the first granulation cylinder 1, enter in the first drying chamber 7, and be attached on travelling belt 6.In flow process, increase following steps:
C0, external dehydration;
D0, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc0; When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operating procedure b; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to step c0.
In the present embodiment two, step c0 is external dehydration, can realize by various ways such as centrifugal dewatering, belt type dehydration, extruding type dehydration, sludge dewatering equipments, main by the mode of mechanical dehydration, also can adopt the devices such as oar blade type sludge drying to realize, but because the latter uses primary energy source too much, can lose a part of power savings advantages, and this step c0 only needs the water ratio of wet sludge dewatering to 80% left and right, and general wet mud can reach this water ratio by simple dehydration mode.
Steps d 0 detects and reads current wet moisture percentage in sewage sludge, similar to steps d 1, can enter the mud sample before lower funnel 2 by timing acquiring, carry out the mensuration of water ratio, also can be by the water ratio of the current mud of weight induction device 10 metering be set in lower funnel 2 bottoms, compare with the initial weight of mud, by both relation, obtain the water ratio of mud.
By the comparison between current moisture percentage in sewage sludge and set(ting)value mc0, also similar to steps d 1 in steps d 0.When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operating procedure b, the mud that wets enters lower funnel 2 and starts to carry out granulating and drying; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to step c0, re-start external dehydration.Moisture percentage in sewage sludge set(ting)value mc0 in this step, depends primarily on the granulating property of wet mud, if wet sewage sludge viscosity is higher, can be set as 70%-80%, general municipal sludge or industrial sludge, and setting value value is the highest is no more than 85% for this.
The step c0, the steps d 0 that in embodiment bis-, increase, can effectively avoid the too high wet mud of water ratio to enter Granulating and Drying Apparatus for Wet Powder Body and Liquid, and from guaranteeing granulation effect and the drying effect of wet mud in the first drying chamber 7 of the first granulation cylinder 1.Step a in embodiment bis-, b, c1, d1 and e with identical in embodiment mono-, no longer repeat herein.
Embodiment tri-
The present embodiment three is with the difference of embodiment mono-, as shown in Figure 3, original the first granulation cylinder 1 granulation and complete dry after, through 4 upsets of blanking scraper plate, drop, increase step c2, other flow processs are constant.Its objective is as reducing the cycle index in step c1, shorten the stroke of individual layer travelling belt 6, and overcome the defect of " water ratio of pressing close to the wet mud of one side of travelling belt changes less " described in embodiment mono-, increase this step:
C2, through the second granulation cylinder 5 granulations (step c21), enter the second drying chamber 8 dry (step c22), through 4 upsets of blanking scraper plate drop (step c23).
In the present embodiment, the essentiality content of step c2 is similar to step c1, through the first granulation cylinder 1 granulation (step c11) the mud after the first drying chamber 7 inner dryings (step c12), water ratio can decline gradually, and the water ratio of pressing close to the wet mud of one side of travelling belt 6 changes less.Final wet mud is dropped (step c13) by 4 upsets of blanking scraper plate, enters the second granulation cylinder 5 (step c21), and enters the second drying chamber 8 dry (step c22).Granulation now, does not change original wet mud direction, and it drops on travelling belt 6, retained relative wetted surface upward, relatively dry ventricumbent feature.The object that the second granulation cylinder 5 arranges, the one, further the surface-area of the wet mud of increase, promotes dry; The 2nd, revise the shape of wet mud, keep relatively straight, the upset that is beneficial to follow-up scraper plate drop (step c23).The second drying chamber 8 and the first drying chamber 7 are similar, no longer describe in detail herein.
Embodiment tri-increases step c2, and follow-up flow process does not all change, with consistent in embodiment mono-.Its object is mainly consider the manufacturing process of integral device and apply place and limit, and the effect in wet drying sludge process strengthens; Step c2 adds, can make in theory the length of individual layer travelling belt or width foreshorten to original 50%, the combined stroke of wet mud on travelling belt are constant, and time of drying is constant, granulation process increases the adjustment of the second granulation cylinder, is more conducive to the efficient drying of wet mud.
Embodiment tetra-
The present embodiment four is with the difference of embodiment mono-, as shown in Figure 4, between original steps d 1 and step e, increases step c3, and other flow processs are constant.Its objective is as reducing the set(ting)value condition in steps d 1, reduce in flow process and return to the action of step b, and consider the difference of drying conditions, wet mud is now located the condition of mentioning in claim 8 substantially, and its water ratio normally can reach 60% level; And after step c1, the outside surface moisture of wet mud is drying substantially, returns to step b and enters the first granulation cylinder 1 and the second granulation cylinder 5 granulations in subsequent step, and effect is not fairly obvious.Therefore the setting of step c3, can effectively overcome the above problems.
C3, through mud thickness first pressing control lever 9 (step c31), enter the 3rd drying chamber 11 dry (step c32), through 4 upsets of blanking scraper plate drop (step c33).
In the present embodiment, the mud thickness first pressing control lever 9 that step c3 comprises, be with the first granulation cylinder 1 difference in step c1, in its granulation process, to the control of particle diameter, the spacing by this control lever and travelling belt 6 transmission shafts determines, through the wet mud of mud thickness first pressing control lever 9, its thickness general control is at 1-5mm.Therefore the wet mud after mud thickness first pressing control lever 9 first pressing (step c31), can break because of extruding in the dry and hard top layer of its outside surface, expose the part that inner water ratio is higher, and effect is better than returns to the granulation effect of bringing after step b.And the first drying chamber 7 in the structure of the 3rd drying chamber 11 and embodiment mono-is similar, different, in the relative step c1 of flow velocity of the hot air medium in its inner air outlet box 16, atmospheric moisture is 5%-30%, temperature is 85 ℃-150 ℃, and wind speed is 10 meter per second-20 meter per seconds.Blanking scraper plate 4 same step c1 is set, no longer repeat herein.
In embodiment tetra-, increase step c3, through the first pressing (step c31) of mud thickness first pressing control lever 9, can effectively increase the surface-area of wet mud, be equipped with the air themperature improving in the 3rd drying chamber 11, reduce wind speed and be controlled at 10 meter per second-20 meter per seconds, strengthening drying effect.The setting of this step, has reduced the set(ting)value mc1 in steps d 1, and the frequency that makes wet mud return to step b reduces, and replaces with step c3, obtains better granulation and drying effect.
Embodiment five
The present embodiment five is with the difference of embodiment tetra-, as shown in Figure 5, on the basis of former c3 in steps, increases for the detection of moisture percentage in sewage sludge and compares with set(ting)value, increases steps d 2, to control output moisture percentage in sewage sludge.Other flow processs are constant.
D2, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc2; When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operating procedure e; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to step c3.
In the present embodiment, added the steps d 2 of similar steps d 1, its actual detection principle is also similar, no longer repeats herein.What difference was moisture percentage in sewage sludge in steps d 2 judges set(ting)value different (set(ting)value mc1 scope is 50%-80%), now because wet moisture percentage in sewage sludge is 20%-50%, the extruding of reinforcement again, reinforcement through step c3 are dry, water ratio has now approached this 20%-35%, if the wet mud water ratio adding in step c0 is not more than 80%, mud granulizing is now dry completes substantially.For guaranteeing the quality of dry rear mud, set(ting)value in steps d 2 can be set as 30-40% (set(ting)value mc2 scope 20%-50%), if do not reach this set(ting)value, the wet mud in this stage returns in step c3 again, and carries out the granulation again of mud gauge control bar 9 first pressing and being again dried in the 3rd drying chamber 11.
The interpolation of embodiment five, carries out one check to the wet dried quality of mud granulizing, is beneficial to processing after later stage dewatered sludge outlet (as sludge incineration etc.).
Embodiment six
The step that the present embodiment six adopts for above each embodiment gather example, face high humidity, when the mud of intermediate treatment difficulty need to be dried, the comprehensive treatment step of employing.But, also and be not only confined in the processing sequence and treatment step of the present embodiment, six Granulating and Drying Apparatus for Wet Powder Body and Liquid figure in conjunction with the embodiments just, a specific embodiment that solves more unmanageable mud is described, processing in other special mud situation, may be on the treatment step basis of the present embodiment, the thinking of the technical scheme disclosing according to the present invention, increases or deletes and produce new combination granulation and dry treatment step.
As shown in Figure 6, in embodiment six, key step, with consistent in embodiment five, only increases step c4.Its object is mainly to consider the manufacturing process of integral device, and the effect in wet drying sludge process strengthens; Step c4 adds, can make in theory the length of individual layer travelling belt 6 or width foreshorten to original 50%, the combined stroke of wet mud on travelling belt 6 are constant, time of drying is constant, granulation process increases by the 12 final pressure adjustment of mud thickness final pressure control lever, can deeper degree breaking because of extruding in the dry and hard top layer of mud outside surface, thereby exposes the efficient drying that part that inner water ratio is relatively high promotes wet mud.
Granulation and the drying process of whole wet mud are described below:
Wet mud, through the external dehydration of step c0, detects judgement through steps d 0, reaches the water ratio that this granulating and drying method requires, and enters the lower funnel 2 in step b; Lower funnel 2 bottoms are containing the first granulation cylinder 1 in step c1, and through step c11 granulation, the first drying chamber 7 entering immediately in step c12 is dry, and wet mud is carried in drying chamber by travelling belt 6, finally with blanking scraper plate 4 upsets in step c13, drops; Whole process is carried out continuously, and wet mud upper and lower surface is relative wetted surface, and granulation and drying process are carried out simultaneously.
After step c13, turn over the wet mud falling and enter the second granulation cylinder 5 in step c2, through step c21 granulation, the second drying chamber 8 entering immediately in step c22 is dry, and carries in drying chamber by travelling belt 6, finally with blanking scraper plate 4 upsets in step c23, drops; Whole process neutralizes in the first drying chamber 7 and compares, and wet mud upper surface is relative wetted surface, and lower surface is relative dried noodle, and granulation and drying process are carried out simultaneously.
Now enter detection and the judgement of steps d 1, if wet moisture percentage in sewage sludge is still higher, return to the lower funnel 2 in step b, cyclic drying enters the required water ratio of step c3 until wet mud reaches; If wet moisture percentage in sewage sludge reaches set(ting)value, enter step c3, start the granulation of next stage and be dried.
Wet mud enters mud thickness first pressing control lever 9 first pressing (step c31) in step c3, form the wet mud of thin shape, enter the 3rd drying chamber 11 dry (step c32), and carry in drying chamber by travelling belt 6, finally with blanking scraper plate 4 upsets in step c33, drop; Whole process is compared with in the first drying chamber 7, and wet mud upper and lower surface water ratio is all lower, and the temperature in drying chamber increases to some extent, and granulation thickness is less, and and drying process carry out simultaneously.
After step c33, turning over the wet mud falling enters in step c4, mud thickness final pressure control lever 12 final pressure granulations through step c41, the 4th drying chamber 13 entering immediately in step c42 is dry, and carries in drying chamber by travelling belt 6, finally with blanking scraper plate 4 upsets in step c43, drops; Whole process neutralizes in the first drying chamber 7 and compares, and wet mud upper surface is relative wetted surface, and lower surface is relative dried noodle, and granulation and drying process are carried out simultaneously.
Wet mud granulizing and drying process now complete substantially, enter detection and the judgement of steps d 2, if wet moisture percentage in sewage sludge does not reach the final mummification requirement of mud, return to step c3, and cyclic drying are until reach the final mummification requirement of mud; If wet moisture percentage in sewage sludge reaches set(ting)value, enter step e, complete granulation and the drying process of whole wet mud.
Step c4 and step c3 are basic identical, but it can reduce travelling belt 6 length or the width of step c3, c4 after arranging, to reduce device length or width, and overcome the problem of the same similar step c1 producing in step c3 drying process " water ratio of pressing close to the wet mud of one side of travelling belt changes less ".Mud thickness final pressure control lever 12 final pressure principles in step c4 are similar to step c3, but its spacing can suitably reduce 0.3-0.5mm.And temperature in the 4th drying chamber 13 and wind speed can with the 3rd drying chamber 11 in be consistent.The mud dropping through blanking scraper plate 4 upsets of step c3 enters in the mud thickness first pressing control lever 9 in step c4, again mud is further pushed, if now moisture percentage in sewage sludge is too small, therefore mud may be pulverized; Therefore after setting steps c4, the set(ting)value in steps d 2 needs respective degrees to improve 5% left and right, keep being not less than 20% through the dried moisture percentage in sewage sludge of step c4, if for sludge incineration, can be not less than 30%.
Embodiment six increases step c4, and follow-up flow process does not all change, with consistent in embodiment five.Its object is mainly to consider the manufacturing process of integral device, and the effect in wet drying sludge process strengthens; Step c4 adds, can make the length of individual layer travelling belt 6 or width foreshorten to original 50%, the combined stroke of wet mud on travelling belt 6 are constant, time of drying is constant, granulation process increases by the 12 final pressure adjustment of mud thickness final pressure control lever, can deeper degree breaking because of extruding in the dry and hard top layer of mud outside surface, thereby exposes the efficient drying that part that inner water ratio is relatively high promotes wet mud.
If Fig. 7 is a kind of Granulating and Drying Apparatus for Wet Powder Body and Liquid figure for wet mud for realizing the object of the invention of the embodiment of the present invention six, mainly comprise the first granulation cylinder 1, the second granulation cylinder 5, mud thickness first pressing control lever 9, blanking scraper plate 4, travelling belt 6 etc.2 mouthfuls of places of lower funnel are provided with the first granulation cylinder 1, this the first granulation cylinder 1 comprises intermeshing, the male and female compound gear that between centers can regulate each other, this organizes male cylinder and the same footpath of female cylinder, parallel, and cylinder scraper plate 3 meshes with the tooth pitch 12 of male and female, cylinder respectively.
The below of lower funnel 2 is also provided with gravity sensing device 10.
In the first drying chamber 7, be provided with travelling belt 6, the wet mud of processing through the first granulation cylinder 1 drops on travelling belt 6; In the first drying chamber 7, be also provided with the wind pushing box 16 of air outlet 17.
The wet mud that the second granulation cylinder 5 is arranged in the second drying chamber 8, the first drying chambers 7 processing enters the further granulation of the second granulation cylinder 5, is provided with travelling belt 6 in drying chamber, and the wet mud of processing through the second granulation cylinder 5 drops on travelling belt 6 through blanking scraper plate 4; In the second drying chamber 8, be also provided with the wind pushing box 16 of air outlet 17.
The 3rd drying chamber 11 internal layers are fixed with mud thickness first pressing control lever 9, travelling belt 6, wind pushing box 16 etc.These mud thickness first pressing control lever 9 attached blanking scraper plates 4 in bottom.
Herein the direct of travel of travelling belt as shown by the arrows in Figure 2, the turning to as shown in Figure 2 of the second granulation cylinder 5 and mud thickness first pressing control lever 9.
Granulation and the drying process of whole wet mud are described in conjunction with Fig. 6 and Fig. 7.
Step c0 in embodiment six and b0 carry out outward at this setting drawing, and wet mud need be judged and enter this device through steps d 0; Step b completes in lower funnel 2; The wet mud of step c1 after the first granulation cylinder 1 granulation, in the first drying chamber 7, with travelling belt 6, along the direction of arrow, advance, air in the wind pushing box 16 of top remains on more than 80 ℃, wind speed, not higher than 30 meter per seconds, blows to wet Sludge Surface through air outlet 17, after arrival blanking scraper plate 4, turns over, step c2 carries out in the second drying chamber, again with travelling belt 6, along the direction of arrow, advance, now down, wetted surface upward relatively for the wet relative dried noodle of mud.Wet mud should guarantee that through steps d 1 most wet mud enters step c3 under normal circumstances, enter the 3rd drying chamber 11, through 9 first pressing of mud thickness first pressing control lever, and advance along the direction of arrow with travelling belt 6, air themperature in wind pushing box 16 now can be improved, and wind speed drops to below 20 meter per seconds; With the mud scraping by this layer of scraper plate, start step c4, again fall into mud thickness final pressure control lever 12 final pressure that spacing is less, with travelling belt 6, along the direction of arrow, advance.Before dewatered sludge outlet 15, carry out steps d 2, if the water ratio of mud reaches set(ting)value requirement, mud granulizing has been dried, and mud leaves the 4th drying chamber 13 from dewatered sludge outlet 15.
Device and parts that in above embodiment, each step adopts are included in the device of the present embodiment six, can understand with reference to structure and mutual alignment relation in the Granulating and Drying Apparatus for Wet Powder Body and Liquid figure of figure 7 wet mud, but this setting drawing just illustrates the structure reference of actual motion, can not be interpreted as the restriction to technical solution of the present invention.The method that every those skilled in the art discloses according to the present invention, can design other forms of granulation and the dry device of completing, also in protection scope of the present invention.
Claims (10)
1. the drying means of a wet mud, for realizing the device of the object of the invention, mainly comprise lower funnel (2), the first granulation cylinder (1), the first drying chamber (7), travelling belt (6), blanking scraper plate (4), this granulating and drying method comprises the following steps successively:
A, drying sludge start;
B, wet mud enter funnel under Granulating and Drying Apparatus for Wet Powder Body and Liquid (2);
C1, through the first granulation cylinder (1) granulation, and enter the first drying chamber (7), by blanking scraper plate (4) upset, dropped;
D1, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc1 (scope 50%-80%); When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operation e; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to b;
E, mud granulizing have been dried.
2. the drying means of wet mud according to claim 1, is characterized in that between described step a and step b further comprising the steps of:
C0, to the wet external dehydration of mud;
D0, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc0 (scope 70%-80%); When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operation b; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to c0.
3. the granulating and drying method of wet mud according to claim 1, is characterized in that between described step c1 and steps d 1 further comprising the steps of:
C2, through the second granulation cylinder (5) granulation, and enter the second drying chamber (8), by blanking scraper plate (4) upset, dropped.
4. the granulating and drying method of wet mud according to claim 1, is characterized in that between described steps d 1 and step e further comprising the steps of:
C3, through mud thickness first pressing control lever (9) first pressing, and enter the 3rd drying chamber (11), by blanking scraper plate (4) upset, dropped.
5. the granulating and drying method of wet mud according to claim 4, is characterized in that between described step c3 and step e further comprising the steps of:
D2, detect and read current wet moisture percentage in sewage sludge, and judge whether moisture percentage in sewage sludge is less than or equal to set(ting)value mc2 (scope 20%-50%); When current moisture percentage in sewage sludge is less than or equal to this set(ting)value, operation e; When current moisture percentage in sewage sludge is greater than this set(ting)value, return to c3.
6. the granulating and drying method of wet mud according to claim 5, is characterized in that between described step c3 and steps d 2 further comprising the steps of:
C4, through mud thickness final pressure control lever (12) final pressure, and enter the 4th drying chamber (13), by blanking scraper plate (4) upset, dropped.
7. according to the granulating and drying method of the wet mud described in any one in claim 1 to 6, while it is characterized in that using the first granulation cylinder (1) granulation, the water ratio of wet mud need remain on 50%-80%; Wet moisture percentage in sewage sludge is higher, and the air wind speed in wind pushing box (16) is higher, and temperature is lower; Wet moisture percentage in sewage sludge is lower, and the air wind speed in wind pushing box (16) is lower, temperature is higher; Atmospheric moisture is 5%-30%, and temperature is 85 ℃-150 ℃, and wind speed is 10 meter per second-30 meter per seconds.
8. according to the granulating and drying method of the wet mud described in any one in claim 1 to 6, while it is characterized in that using mud thickness first pressing control lever (9), the water ratio of wet mud need remain on 20%-50%; Wet moisture percentage in sewage sludge is higher, and the air wind speed in wind pushing box (16) is higher, and temperature is lower; Wet moisture percentage in sewage sludge is lower, and the air wind speed in wind pushing box (16) is lower, temperature is higher; Atmospheric moisture is 5%-30%, and temperature is 85 ℃-150 ℃, and wind speed is 10 meter per second-20 meter per seconds.
9. according to the granulating and drying method of the wet mud described in any one in claim 1 to 6, it is characterized in that described detection and read current wet moisture percentage in sewage sludge, through the drop mud sample of travelling belt (6) of blanking scraper plate (4) upset by timing acquiring, carry out the mensuration of water ratio, or by weight induction device (10), measure the water ratio of current mud.
10. according to the granulating and drying method of the wet mud described in any one in claim 1 to 6, the drying chamber described in it is characterized in that can be arranged in pairs, meets wet mud import (14) and dewatered sludge outlet (15) and is positioned at the same side; Also can become odd number to arrange, meet wet mud import (14) and dewatered sludge outlet (15) and be positioned at not homonymy; The devices such as the first granulation cylinder (1) in drying chamber or mud thickness first pressing control lever (9) are arranged and are adjusted accordingly with drying chamber.
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CN106830611A (en) * | 2017-01-22 | 2017-06-13 | 浙江建华集团过滤机有限公司 | Filter-pressing method and implement the press filteration system of the filter-pressing method |
CN107298994A (en) * | 2017-08-11 | 2017-10-27 | 宁夏瑞威尔能源环境工程有限公司 | A kind of biomass energy particle composition and preparation method thereof |
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CN114890650A (en) * | 2022-05-31 | 2022-08-12 | 罗时雨 | Environment-friendly low-temperature sludge drying method capable of accurately judging endpoint |
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