CN208234739U - A kind of circulating energy-saving sludge at low temperature desiccation machine system - Google Patents
A kind of circulating energy-saving sludge at low temperature desiccation machine system Download PDFInfo
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- CN208234739U CN208234739U CN201820410611.7U CN201820410611U CN208234739U CN 208234739 U CN208234739 U CN 208234739U CN 201820410611 U CN201820410611 U CN 201820410611U CN 208234739 U CN208234739 U CN 208234739U
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Abstract
The utility model discloses a kind of circulating energy-saving sludge at low temperature desiccation machine systems；The utility model passes through improvement: increasing a cooling tower and purifier, cooling tower will can be used to cool down the high-temperature cooling water of refrigerant, be cooled down, and come back in cooling pipe, be recycled.The condensed water that purifier will be brought out from sludge simultaneously, reaches the water quality requirement that can be used as cooling water after purification, and is pumped into cooling tower and is recycled after cooling.In sludge at low temperature drying process, condensed water and cooling water are subjected to overall process recycling, are effectively saved water resource, overall process is without secondary pollution, so that the process for carrying out desiccation to sludge material is more environmentally-friendly and energy-efficient.
Description
Technical field
The utility model relates to sludge at low temperature drying and other treatment fields, are especially a kind of circulating energy-saving sludge at low temperature desiccation machine
System.
Background technique
With the large-scale Construction and operation of wastewater treatment in China factory, sludge yield is also significantly increased, the prestige of environmental pollution
The side of body is on the rise, and the moisture percentage in sewage sludge through dehydration is still higher than 80% mostly, and contains a large amount of poisonous and harmful substances, property
It is unstable, it is unfavorable for transporting.Therefore, before carrying out the stabilization processes such as Sludge landfill, burning, it is dry to need to carry out it dehydration
Change, is down to its moisture content lower.
Sludge heat drying technology is with taking up little area in domestic drying technique at present, and drying efficiency is high, caused by environment
Small unique advantage is polluted, wherein the temperature of low temperature desiccation is 100 DEG C hereinafter, it is possible to prevente effectively from the volatilization of foul gas, most
The release of benzene homologues is reduced to limits, there is good energy conservation and environmental benefit.Low temperature drying equipment is using dehumidifying heat pump skill
Art principle constantly recycles the air containment of heating in drying box, takes away moisture in sludge, and cold in evaporator end progress
Solidifying dehumidifying.To avoid or reducing energy loss, drying box must stringent closed and thermal insulation property it is good.Meanwhile low temperature
Drying equipment should be able to adapt to different disposal Capability Requirement, be conducive to if being able to achieve modularization assembling enterprising on existing equipment basis
Row transformation, to increase the processing capacity of equipment.
It is found by retrieval, it is dry that the utility model of patent No. CN201620825740.3 discloses a kind of novel sludge at low temperature
Change processing system, is mainly made of heating unit, low temperature desiccation unit, heat recovery unit and condensate drainage unit, heat supply list
Member is set to the bottom center of low temperature desiccation unit, is connected with low temperature desiccation unit；Heat recovery unit is set to low temperature desiccation list
The two sides of first upper surface, condensate drainage unit and low temperature desiccation unit, heat recovery unit pass through pipeline connection.
The invention discloses a kind of low-temperature sludge drying treatment systems, including heat pump system by patent No. CN201710311949.7
System, air circulating system, sludge drying chamber, spray system, filter and surface air cooler；The heat pump system includes evaporator, condensation
Device, compressor and expansion valve, the evaporator connect the condenser by the compressor and expansion valve；The condenser is logical
It crosses the air circulating system and connects the sludge drying chamber；The sludge drying chamber connects the spray system；The spray system
System connects the filter；The filter connects the surface air cooler；The surface air cooler connects the condenser.
The invention discloses a kind of sludge at low temperature desiccation apparatus by patent No. CN201710040036.6；It include: by totally-enclosed
Sludge drying chamber comprising the multilayer foraminous conveyer and sludge outlet structure of the sludge inlet, tandem array that are from top to bottom arranged
At sludge operating system and by heat pump system, heated dry air room and blower is occurred, and is formed in sludge drying room from the bottom to top
Circulation desiccation air-flow heated dry air operating system.
The analysis found that there is also following deficiencies for most domestic sludge at low temperature desiccation apparatus at present；
First, lack and the condensed water brought out in sludge is purified for sludge at low temperature desiccation apparatus, and
In sludge at low temperature drying process, condensed water and cooling water is recycled in shortage, is caused water resource waste larger, is unfavorable for
Environmental protection and energy conservation；Second, for most sludge at low temperature desiccation apparatus, wherein at corresponding sludge inlet it is exposed outside, lack
Weary protective device, it sometimes appear that spluttering phenomenon；Third, in sludge at low temperature anhydration system lack better performances condensate pipe and
Cooling water pipe.
Utility model content
Therefore, in order to solve above-mentioned deficiency, the utility model provides a kind of circulating energy-saving sludge at low temperature desiccation machine system herein
System；The utility model passes through improvement: increasing a cooling tower and purifier, cooling tower will can be used to cool down the high temperature of refrigerant
Cooling water is cooled down, and is come back in cooling pipe, is recycled.Purifier will be brought out from sludge simultaneously
Condensed water reaches the water quality requirement that can be used as cooling water after purification, and is pumped into cooling tower and is recycled after cooling.Sludge at low temperature
In drying process, condensed water and cooling water are subjected to overall process recycling, are effectively saved water resource, overall process is without secondary dirt
Dye, so that the process for carrying out desiccation to sludge material is more environmentally-friendly and energy-efficient.
The utility model is realized in this way constructing a kind of circulating energy-saving sludge at low temperature desiccation machine system, including sludge is low
Warm desiccation room, material distributing machine, evaporator, air filter, foraminous conveyer, sludge outlet, blower, external condenser；Wherein, cloth
Material machine, evaporator, air filter, foraminous conveyer, sludge outlet, blower are located at the inside of sludge at low temperature desiccation room,
And foraminous conveyer is arranged in the lower section of material distributing machine, evaporator, air filter, sludge outlet is located at the end of foraminous conveyer；
External condenser is located at the outside of sludge at low temperature desiccation room；It is characterized by: the system further includes cooling tower and purifier；?
It is connected to by condensate pipe with purifier on sludge at low temperature desiccation room and corresponding at air filter, purifier leads to again
Condensate pipe is crossed to be connected to cooling tower；Meanwhile cooling tower passes through two cooling water pipes respectively and external condenser forms circulation and connects
It is logical.The utility model passes through improvement: increasing a cooling tower and purifier, cooling tower will can be used to cool down the high temperature of refrigerant
Cooling water is cooled down, and is come back in cooling pipe, is recycled.Purifier will be brought out from sludge simultaneously
Condensed water reaches the water quality requirement that can be used as cooling water after purification, and is pumped into cooling tower and is recycled after cooling.Sludge at low temperature
In drying process, condensed water and cooling water are subjected to overall process recycling, are effectively saved water resource, overall process is without secondary dirt
Dye, so that the process for carrying out desiccation to sludge material is more environmentally-friendly and energy-efficient.
As an improvement of the above technical solution, a kind of circulating energy-saving sludge at low temperature desiccation machine system；In material distributing machine
Upper end is provided with charging protective device, which includes charging shell；
The charging shell is to be obliquely installed, and the cylindrical structure that charging shell is wall thickness 1-2cm feeds shell from body
With the protecting crust for preventing sundries from entering；The lower end outside weldings of charging shell have bearing body；Bearing body is the steel of thickness 1-2cm
Plate is made, and the lower end of bearing body is fixed with detent block by nut, and one end of detent block is used behind the lower end of bearing body
Nut is fixed, and the upper end of material distributing machine forms bending support edge；Its charging protective device is set to be placed in material distributing machine by detent block
Upper end bending support along upper, the upper end of material distributing machine is integrally covered.Feeding device described in the utility model such as Fig. 3 institute
Show, is applied in the upper end of material distributing machine, the upper end of material distributing machine is integrally covered；In the upper end of material distributing machine setting charging protection dress
It sets, then can play preferable protective action to the upper end of material distributing machine, when charging can prevent sludge spluttering.
As an improvement of the above technical solution, a kind of circulating energy-saving sludge at low temperature desiccation machine system；It feeds on shell
End is provided with protection curtain；Also it can effectively prevent external sundries from entering.
As an improvement of the above technical solution, a kind of circulating energy-saving sludge at low temperature desiccation machine system；Condensate pipe packet
Include internal temperature resistant plastic layer, middle part polystyrene foam filled layer and external stainless steel ripple thin layer；Middle part polystyrene foam
Between the internally positioned temperature resistant plastic layer of filled layer and external stainless steel ripple thin layer.The utility model is using as shown in fig. 4-5
The condensate pipe of structure, the benefit of condensate pipe are internal high temperature resistants, and middle part is heat-insulated, mute；External stainless steel ripple thin layer energy
Enough increase the integral strength of condensate pipe, and can be realized certain bending.
As an improvement of the above technical solution, a kind of circulating energy-saving sludge at low temperature desiccation machine system；Cooling water pipe packet
Include Inner plastic layer and middle part stainless steel ripple thin layer and outer decorative layer；The internally positioned plastic layer of middle part stainless steel ripple thin layer
Between outer decorative layer.Cooling water pipe as shown in FIG. 6 is for other cooling water pipes, and the entirety of cooling water pipe is securely
Property is preferable, and tube body can be realized certain bending, thus globality can be promoted while enhancing exterior appearance.
As an improvement of the above technical solution, a kind of circulating energy-saving sludge at low temperature desiccation machine system；Sludge outlet is V
Type or U-shaped structure；Convenient for the sludge being scattered is transferred out with spiral conveying mechanism cooperation.
As an improvement of the above technical solution, a kind of circulating energy-saving sludge at low temperature desiccation machine system；Blower is located at dirt
The bottom of mud low temperature desiccation room；Air draft is carried out by bottom of the blower to sludge at low temperature desiccation room.
The utility model has the advantages that the utility model provides a kind of circulating energy-saving sludge at low temperature by improving herein
Desiccation machine system, have the advantages that as follows improve and；
Advantage 1: go out including sludge at low temperature desiccation room, material distributing machine, evaporator, air filter, foraminous conveyer, sludge
Mouth, blower, external condenser；Wherein, material distributing machine, evaporator, air filter, foraminous conveyer, sludge outlet, blower difference
Positioned at the inside of sludge at low temperature desiccation room, and foraminous conveyer is arranged in the lower section of material distributing machine, evaporator, air filter, dirty
Mud outlet is located at the end of foraminous conveyer；External condenser is located at the outside of sludge at low temperature desiccation room；The system further includes cooling
Tower and purifier；On sludge at low temperature desiccation room and correspond at air filter through condensate pipe and purifier company
Logical, purifier passes through condensate pipe again and is connected to cooling tower；Meanwhile cooling tower pass through respectively two cooling water pipes with it is external cold
Condenser forms circulation connection.The utility model increases a cooling tower and purifier, cooling tower can will be used for by improving
The high-temperature cooling water of cooling refrigerant, is cooled down, and come back in cooling pipe, is recycled.Purifier will be from simultaneously
The condensed water brought out in sludge reaches the water quality requirement that can be used as cooling water after purification, and is pumped into cooling tower and follows after cooling
Ring uses.In sludge at low temperature drying process, condensed water and cooling water are subjected to overall process recycling, are effectively saved water money
Source, overall process is without secondary pollution, so that the process for carrying out desiccation to sludge material is more environmentally-friendly and energy-efficient.
A kind of advantage 2: circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；It is arranged in the upper end of material distributing machine
There is charging protective device, which includes charging shell；
The charging shell is to be obliquely installed, and the cylindrical structure that charging shell is wall thickness 1-2cm feeds shell from body
With the protecting crust for preventing sundries from entering；The lower end outside weldings of charging shell have bearing body；Bearing body is the steel of thickness 1-2cm
Plate is made, and the lower end of bearing body is fixed with detent block by nut, and one end of detent block is used behind the lower end of bearing body
Nut is fixed, and the upper end of material distributing machine forms bending support edge；Its charging protective device is set to be placed in material distributing machine by detent block
Upper end bending support along upper, the upper end of material distributing machine is integrally covered.Feeding device described in the utility model such as Fig. 3 institute
Show, is applied in the upper end of material distributing machine, the upper end of material distributing machine is integrally covered；In the upper end of material distributing machine setting charging protection dress
It sets, then can play preferable protective action to the upper end of material distributing machine, when charging can prevent sludge spluttering.
A kind of advantage 3: circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Charging shell upper end is provided with
Protect curtain；Also it can effectively prevent external sundries from entering.
A kind of advantage 4: circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Condensate pipe includes internal resistance to
Warm plastic layer, middle part polystyrene foam filled layer and external stainless steel ripple thin layer；Middle part polystyrene foam filled layer position
Between internal temperature resistant plastic layer and external stainless steel ripple thin layer；The utility model is cold using structure as shown in fig. 4-5
Condensate pipe, the benefit of condensate pipe are internal high temperature resistants, and middle part is heat-insulated, mute；External stainless steel ripple thin layer can increase cold
The integral strength of condensate pipe, and can be realized certain bending.
A kind of advantage 5: circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Cooling water pipe includes internal modeling
The bed of material and middle part stainless steel ripple thin layer and outer decorative layer；The middle part internally positioned plastic layer of stainless steel ripple thin layer and external dress
It adorns between layer.For cooling water pipe as shown in FIG. 6 for other cooling water pipes, the integral firmness of cooling water pipe is preferable,
Tube body can be realized certain bending, thus globality can be promoted while enhancing exterior appearance.
A kind of advantage 6: circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Sludge outlet is V-type or U-shaped
Structure；Convenient for the sludge being scattered is transferred out with spiral conveying mechanism cooperation.
A kind of advantage 7: circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Blower is dry positioned at sludge at low temperature
Change the bottom of room；Air draft is carried out by bottom of the blower to sludge at low temperature desiccation room.
Detailed description of the invention
Fig. 1 is the overall schematic of the utility model；
Fig. 2 is the implementation status diagram that the utility model has charging protective device；
Fig. 3 is the schematic diagram that protective device is fed in the utility model；
Fig. 4 is condensate pipe schematic cross-section in the utility model；
Fig. 5 is condensate pipe outside schematic diagram in the utility model；
Fig. 6 is cooling water pipe schematic cross-section in the utility model.
Wherein: sludge at low temperature desiccation room 1, material distributing machine 2, evaporator 3, air filter 4, foraminous conveyer 5, sludge outlet
6, blower 7, external condenser 8, cooling tower 9, purifier 10, charging shell 11, protecting crust 12, bearing body 13, detent block
14, bending support is along 15, internal temperature resistant plastic layer 16, middle part polystyrene foam filled layer 17, external stainless steel ripple thin layer
18, Inner plastic layer 19, middle part stainless steel ripple thin layer 20, outer decorative layer 21, protection curtain 22.
Specific embodiment
The utility model is described in detail below in conjunction with attached drawing 1- Fig. 6, to the skill in the utility model embodiment
Art scheme is clearly and completely described, it is clear that and the described embodiments are only a part of the embodiments of the utility model, and
The embodiment being not all of.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creativeness
Every other embodiment obtained, fall within the protection scope of the utility model under the premise of labour.
The utility model provides a kind of circulating energy-saving sludge at low temperature desiccation machine system by improving herein, such as Fig. 1-Fig. 6 institute
Show, can be practiced as follows；Including sludge at low temperature desiccation room 1, material distributing machine 2, evaporator 3, air filter
4, foraminous conveyer 5, sludge outlet 6, blower 7, external condenser 8；Wherein, material distributing machine 2, evaporator 3, air filter 4, defeated
The inside for sending mesh belt 5, sludge outlet 6, blower 7 to be located at sludge at low temperature desiccation room 1, and foraminous conveyer 5 is arranged in material distributing machine
2, the lower section of evaporator 3, air filter 4, sludge outlet 6 are located at the end of foraminous conveyer 5；External condenser 8 is located at dirt
The outside of mud low temperature desiccation room 1；The system further includes cooling tower 9 and purifier 10；It is on sludge at low temperature desiccation room 1 and corresponding
It is connected to by condensate pipe with purifier 10 at air filter 4, purifier 10 passes through condensate pipe and cooling again
Tower 9 is connected to；Meanwhile cooling tower 9 forms circulation with external condenser 8 by two cooling water pipes respectively and is connected to.
The utility model passes through improvement: increasing a cooling tower 9 and purifier 10, cooling tower 9 will can be used to cool down
The high-temperature cooling water of refrigerant, is cooled down, and is come back in cooling pipe, is recycled.Purifier 10 will be from dirt simultaneously
The condensed water brought out in mud reaches the water quality requirement that can be used as cooling water after purification, and is pumped into cooling tower and recycles after cooling
It uses.In sludge at low temperature drying process, condensed water and cooling water are subjected to overall process recycling, are effectively saved water resource,
Overall process is without secondary pollution, so that the process for carrying out desiccation to sludge material is more environmentally-friendly and energy-efficient.
On the other hand, a kind of circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；In the upper end of material distributing machine 2
It is provided with charging protective device, which includes charging shell 11；
The charging shell 11 is to be obliquely installed, and the cylindrical structure that charging shell 11 is wall thickness 1-2cm, charging shell 11 is certainly
Body has the protecting crust 12 for preventing sundries from entering；The lower end outside weldings of charging shell 11 have bearing body 13；Bearing body 13
It is made of the steel plate of thickness 1-2cm, the lower end of bearing body 13 is fixed with detent block 14, one end of detent block 14 by nut
It is secured with nuts behind the lower end of bearing body 13, the upper end of material distributing machine 2 forms bending support along 15；Make its charging protection dress
The bending for setting the upper end for being placed in material distributing machine 2 by detent block 14 supports along 15, and the upper end of material distributing machine 2 is integrally covered.This
Feeding device described in utility model is as shown in figure 3, applied in the upper end of material distributing machine 2, by the upper end piece cover of material distributing machine 2
Firmly；In the upper end of material distributing machine 2 setting charging protective device, then preferable protective action can be played to the upper end of material distributing machine 2,
Sludge spluttering can be prevented when charging.
On the other hand, a kind of circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Feed 11 upper end of shell
It is provided with protection curtain 22；Also it can effectively prevent external sundries from entering.
On the other hand, a kind of circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Condensate pipe includes interior
Portion's temperature resistant plastic layer 16, middle part polystyrene foam filled layer 17 and external stainless steel ripple thin layer 18；Middle part polystyrene bubble
Between the internally positioned temperature resistant plastic layer 16 of foam filled layer 17 and external stainless steel ripple thin layer 18；The utility model uses such as Fig. 4-
The condensate pipe of structure shown in Fig. 5, the benefit of condensate pipe are internal high temperature resistants, and middle part is heat-insulated, mute；External stainless steel ripple
Thin layer 18 can increase the integral strength of condensate pipe, and can be realized certain bending.
On the other hand, a kind of circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Cooling water pipe includes interior
Portion's plastic layer 19 and middle part stainless steel ripple thin layer 20 and outer decorative layer 21；The internally positioned modeling of middle part stainless steel ripple thin layer 20
Between the bed of material 19 and outer decorative layer 21.Cooling water pipe as shown in FIG. 6 for other cooling water pipes, cooling water pipe
Integral firmness is preferable, and tube body can be realized certain bending, thus globality can be promoted while enhancing exterior appearance.
On the other hand, a kind of circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；Sludge outlet 6 is V-type
Or U-shaped structure；Convenient for the sludge being scattered is transferred out with spiral conveying mechanism cooperation.
On the other hand, a kind of circulating energy-saving sludge at low temperature desiccation machine system described in the utility model；It is low that blower 7 is located at sludge
The bottom of warm desiccation room 1；Air draft is carried out by bottom of the blower 7 to sludge at low temperature desiccation room 1.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (7)
1. a kind of circulating energy-saving sludge at low temperature desiccation machine system, including sludge at low temperature desiccation room (1), material distributing machine (2), evaporator
(3), air filter (4), foraminous conveyer (5), sludge outlet (6), blower (7), external condenser (8)；Wherein, material distributing machine
(2), evaporator (3), air filter (4), foraminous conveyer (5), sludge outlet (6), blower (7) are located at sludge at low temperature
The inside of desiccation room (1), and foraminous conveyer (5) is arranged in the lower section of material distributing machine (2), evaporator (3), air filter (4),
Sludge outlet (6) is located at the end of foraminous conveyer (5)；External condenser (8) is located at the outside of sludge at low temperature desiccation room (1)；Its
Be characterized in that: the system further includes cooling tower (9) and purifier (10)；On sludge at low temperature desiccation room (1) and correspond to sky
Be connected to purifier (10) at gas filter device (4) by condensate pipe, purifier (10) pass through again condensate pipe with it is cold
But tower (9) is connected to；Meanwhile cooling tower (9) forms circulation with external condenser (8) by two cooling water pipes respectively and is connected to.
2. a kind of circulating energy-saving sludge at low temperature desiccation machine system according to claim 1, it is characterised in that: in material distributing machine (2)
Upper end be provided with charging protective device, the charging protective device include charging shell (11)；
The charging shell (11) is to be obliquely installed, and charging shell (11) is the cylindrical structure of wall thickness 1-2cm, is fed shell (11)
The protecting crust (12) for preventing sundries from entering is had from body；The lower end outside weldings of charging shell (11) have bearing body (13)；
Bearing body (13) is made of the steel plate of thickness 1-2cm, and the lower end of bearing body (13) is fixed with detent block (14) by nut, card
One end of position block (14) is secured with nuts behind the lower end of bearing body (13), and the upper end of material distributing machine (2) forms bending support
Along (15)；Its charging protective device is set to be placed in the bending support edge (15) of the upper end of material distributing machine (2) by detent block (14)
On, the upper end of material distributing machine (2) is integrally covered.
3. a kind of circulating energy-saving sludge at low temperature desiccation machine system according to claim 1, it is characterised in that: charging shell (11)
Upper end is provided with protection curtain (22).
4. a kind of circulating energy-saving sludge at low temperature desiccation machine system according to claim 1, it is characterised in that: condensate pipe includes
Internal temperature resistant plastic layer (16), middle part polystyrene foam filled layer (17) and external stainless steel ripple thin layer (18)；Middle part is poly-
Between the internally positioned temperature resistant plastic layer (16) of styrenic foams filled layer (17) and external stainless steel ripple thin layer (18).
5. a kind of circulating energy-saving sludge at low temperature desiccation machine system according to claim 1, it is characterised in that: cooling water pipe includes
Inner plastic layer (19) and middle part stainless steel ripple thin layer (20) and outer decorative layer (21)；Middle part stainless steel ripple thin layer (20)
Between internally positioned plastic layer (19) and outer decorative layer (21).
6. a kind of circulating energy-saving sludge at low temperature desiccation machine system according to claim 1, it is characterised in that:
Sludge outlet (6) is V-type or U-shaped structure.
7. a kind of circulating energy-saving sludge at low temperature desiccation machine system according to claim 1, it is characterised in that: blower (7) is located at
The bottom of sludge at low temperature desiccation room (1).
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| CN201820410611.7U CN208234739U (en) | 2018-03-26 | 2018-03-26 | A kind of circulating energy-saving sludge at low temperature desiccation machine system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109928600A (en) * | 2019-03-28 | 2019-06-25 | 北京科技大学 | Excess sludge low temperature desiccation apparatus and its operation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109928600A (en) * | 2019-03-28 | 2019-06-25 | 北京科技大学 | Excess sludge low temperature desiccation apparatus and its operation method |
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