CN109761474A - Energy-saving sludge drying system and drying method for sludge - Google Patents
Energy-saving sludge drying system and drying method for sludge Download PDFInfo
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- CN109761474A CN109761474A CN201910179183.0A CN201910179183A CN109761474A CN 109761474 A CN109761474 A CN 109761474A CN 201910179183 A CN201910179183 A CN 201910179183A CN 109761474 A CN109761474 A CN 109761474A
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Abstract
The invention discloses a kind of energy-saving sludge drying systems, including sequentially connected sludge preheating unit, sludge heating evaporation unit, MVR compression unit and tail gas treating unit, successively carry out sludge preheating, heating evaporation, secondary steam recompression and tail gas clean-up, can by the drying sludge of water content 80% or so to moisture within 30%, the device capbility is big, it is high-efficient, it can automation control, the steam that sludge heating unit generates can be used for the increasing temperature and pressure of MVR compression unit, and it can be used as the heat source of sludge heating evaporation unit, reduce the consumption of fresh steam, it is a kind of equipment of energy-saving and emission-reduction, and its energy consumption for drying 1 ton of sludge is only the 1/2 of traditional sludge drying equipment, the thermal efficiency is high, it is low in energy consumption, reduce the dependence to boiler plant, reduce pollutant, it is more energy-saving and environmentally friendly.Also disclose drying method for sludge, this method process conditions are mild, are easily achieved, each process can automation control, realize the effect of continuous vacuum drying sludge.
Description
Technical field
The invention belongs to sludge dewatering technical field of drying, it is related to a kind of sludge dry system and drying means, specifically
It says and is related to a kind of energy-saving sludge drying system and drying method for sludge.
Background technique
With the growth of social economy and the development of urbanization, China's total amount of sewage discharge is risen year by year, and ends 2013,
The wastewater emission amount in China is up to 695.4 hundred million tons.10,000 tons of sewage can produce 5-10 tons of sludge according to statistics.To China in 2015
The total amount for producing 80% water content sludge per year reaches 3400 × 104Ton.The domestic Treatment of Sludge stage also in initial stage, mainly only leads to
Cross simple landfill disposal.
Drying sludge is also the first step of sludge treatment as the final link of Treatment of Sludge, in the disposal process of sludge
In have vital effect.Conventional drying means has high temperature heated drying, vacuum drying, radiant drying etc. at present, and sludge is dry
Volume significantly becomes smaller after dry, forms the stable prod of particle or powder, facilitates storage and transport, N P and K is heated in sludge
Equal nutrients can be used as the fertilizer of crops, and the sludge after drying also increases calorific value and can be used as energy sludge, such
Sludge value is considerably improved, and plays the role of turning waste into wealth.
The drying of sludge is logical heat transfer evaporation water, and the utilization rate of the energy determines dry cost and efficiency.Mesh
Preceding drying sludge technology is based on the mode of steam direct heating, and the secondary steam of dry output is gone after condensation or dedusting directly
Run in and put, processing cost is high, therefore develops that a kind of energy-saving effect is good, low-cost sludge drying process becomes current
Urgent problem to be solved.
Summary of the invention
For this purpose, the present invention exactly will solve above-mentioned technical problem, to propose a kind of energy-saving sludge drying system and dirt
Mud drying means.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides a kind of energy-saving sludge drying system comprising sequentially connected sludge preheating unit, sludge add
Thermal evaporation unit, MVR compression unit and tail gas treating unit.
Preferably, the sludge preheating unit includes sludge preheating transport device and water storage device interconnected.
Preferably, the sludge preheating transport device is the screw conveyor with collet, it is connected in the collet cold
Condensate and secondary steam.
Preferably, the sludge heating evaporation unit includes sequentially connected sludge heating evaporation room, cyclone dust collectors
And hydrofilter, sludge heating evaporation room are connected to the sludge preheating transport device and water storage device.
Preferably, sludge heating evaporation room is the hollow blade dryer with collet, cross-compound arrangement, the sky
Heart blade dryer includes shell, and the enclosure interior is provided with transmission shaft, and hollow blade, institute are provided with outside the transmission shaft
It states transmission shaft and is connected with driving mechanism, the case top is provided with sludge import.
Preferably, the MVR compression unit is water vapour compressor, the water vapour compressor and the sludge are heated
Vaporization chamber is connected with hydrofilter.
Preferably, the tail gas treating unit includes tail gas condenser and tail gas absorber, the tail gas condenser connects
It is connected to the water storage device.
The present invention also provides a kind of methods using the dry sludge of the energy-saving sludge drying system comprising as follows
Step:
S1, sludge preheating, sludge preheating unit is by sludge raw material preheating to 80 DEG C or more；
S2, heating evaporation, sludge raw material after preheating is in sludge heating evaporation unit by the moisture content of sludge by 80%
It is dry to be extremely not higher than 30%；
S3, secondary steam compression pass through MVR compression unit after the secondary steam purification for generating sludge heating evaporation unit
Compression, increasing temperature and pressure, reuse to sludge heating evaporation unit；
S4, tail gas clean-up, not condensing sufficiently is after it is handled by tail gas treating unit, and temperature reduces, discharge system.
Preferably, the pressure in the sludge heating evaporation unit is 90kpa, temperature is 97 DEG C；It is compressed secondary
Steam pressure rises to 400kpa, and 143 DEG C of temperature.
Preferably, exhaust temperature is down to 60 DEG C or less by 143 DEG C in the step S4.
The above technical solution of the present invention has the following advantages over the prior art:
(1) energy-saving sludge drying system of the present invention, including the heating of sequentially connected sludge preheating unit, sludge
Evaporation element, MVR compression unit and tail gas treating unit, successively carry out sludge preheating, heating evaporation, secondary steam recompression and
Tail gas clean-up, can by the drying sludge of water content 80% or so to moisture within 30%, the arrangement achieves continuous vacuum is dry
Dry, production capacity is big, high-efficient, can automation control, the steam that sludge heating unit generates can be used for the heating liter of MVR compression unit
Pressure, and can be used as the heat source of sludge heating evaporation unit, the consumption of fresh steam is reduced, is a kind of equipment of energy-saving and emission-reduction,
And by using mechanical vapor recompression technology, the energy consumption of dry 1 ton of sludge is only the 1/2 of traditional sludge drying equipment, heat
It is high-efficient, low in energy consumption, it is only necessary to which that a small amount of fresh steam heating reduces the dependence to boiler plant, reduces pollutant, more energy saving
Environmental protection.
(2) drying method for sludge of the present invention, including preheating sludge, heating evaporation, secondary steam compress, tail gas is net
The step of change, process conditions are mild, are easily achieved, each process can automation control, realize the effect of continuous vacuum drying sludge,
With common process ratio, steam consumption is low, pollutant is few, environmentally protective.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the schematic diagram of energy-saving sludge drying system described in the embodiment of the present invention；
Fig. 2 is the structural representation of sludge heating evaporation room in energy-saving sludge drying system described in the embodiment of the present invention
Figure；
Appended drawing reference indicates in figure are as follows: 1- shell；2- transmission shaft；3- hollow blade；4- transmission component；5- pedestal；6- is dirty
Mud import；The outlet of 7- secondary steam；8- condensation-water drain；The outlet of 9- dewatered sludge；10- heats steam inlet
The present invention can be implemented with many different forms, should not be construed as limited to embodiment set forth herein, on the contrary,
These embodiments are provided, so that the disclosure is thorough and complete, and will fully convey the concept of the invention to art technology
Personnel, the present invention will be defined by the claims.In the accompanying drawings, for clarity, the size of each device and opposite can be exaggerated
Size.Description of the invention and term " first " in claims and attached drawing, " second " etc. are for distinguishing similar right
As without being used to describe a particular order or precedence order.It should be understood that the data used in this way in the appropriate case can be with
It exchanges.In addition, term " includes ", " having " and their any deformation, it is intended that cover and non-exclusive include.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of energy-saving sludge drying system, it is used for sludge treatment, particle or powdered steady is made
Fixed output quota product, the energy-saving sludge drying system is as shown in Figure 1, include sequentially connected sludge preheating unit, sludge heating steaming
Bill member, MVR compression unit and tail gas treating unit.
Specifically, the sludge preheating unit includes sludge preheating transport device and water storage device interconnected, wherein
The sludge preheating transport device is the screw conveyor with collet, is connected with condensed water and secondary steam in the collet, presss from both sides
Condensed water and secondary steam in set jointly heat the sludge for entering screw conveyor, and the water storage device is condensate water pot.
The sludge heating evaporation unit includes sequentially connected sludge heating evaporation room, cyclone dust collectors and wet dedusting
Device, sludge heating evaporation room is connected to the screw conveyor, and is connected to condensate water pot by condensate pipe.The dirt
Mud heating evaporation room is the hollow blade dryer with collet, cross-compound arrangement, and the hollow blade dryer is connected to described
Sludge preheats transport device, water storage device, and specifically, the sludge heating evaporation unit is as shown in Figure 2, including vaporization chamber shell
Body 1, the shell 1 are internally provided with a transmission shaft 2, and 2 surface of transmission shaft is welded with hollow blade 3, and the transmission shaft 2 is logical
It crosses transmission component 4 and is connected to driving mechanism, the driving mechanism can be driving motor, and the transmission component can be speed reducer, pass
The operating of dynamic component 4 makes transmission shaft achieve the purpose that uniform speed slow rotates.The shell 1 is installed on a pedestal 5, the shell top
Portion is provided with sludge import 6 and secondary steam outlet 7, and the sludge import 6 is for being passed through the higher dirt of humidity into vaporization chamber
Mud, secondary steam discharge of the secondary steam outlet 7 for that will generate, 1 bottom of shell is provided with condensation-water drain 8 and dry dirt
Mud outlet 9, the side of transmission shaft 2 are provided with heating steam inlet 10.
The course of work of the sludge heating evaporation unit are as follows: sludge enters heating evaporation room housing 1 from sludge import 6
Interior, driving mechanism drives transmission shaft 2 to rotate, and then hollow blade 3 is driven to rotate, under the stirring action of hollow blade 3, transmission
Steam inside axis 2, shell 1 and hollow blade 3 exchanges heat, and reaching makes high humility sludge evaporation desiccation and mobile to outlet
Purpose, the sludge after desiccation are discharged from dewatered sludge outlet 9.It heats steam self-heating steam inlet 10 and enters shell 1, transmission shaft 2
It is filled with water, is then discharged from condensation-water drain 8, the shell 1, transmission shaft with being condensed behind the inside of hollow blade 3, with sludge heat exchange
2 and hollow blade 3 be hollow structure, have steam inlet and steam (vapor) outlet.
The MVR compression unit is MVR water vapour compressor, the water vapour compressor and sludge heating evaporation room
It is connected with hydrofilter.
The tail gas treating unit includes tail gas condenser and tail gas absorber, and wherein tail gas condenser is connected to the storage
Water installations.
Embodiment 2
The present embodiment also provides a kind of method using the dry sludge of energy-saving sludge drying system described in embodiment 1,
The technique is used to handle the drying sludge of 2t/h, the water content 80% of the sludge comprising following steps:
S1, sludge preheating, by from water content after filter press filters pressing be 80% or so sludge raw material (temperature is on 20 DEG C of left sides
It is right) it is transported in sludge preheating transport device, the condensed water being passed through in transport device collet and part are preheated not by sludge
The secondary steam of condensation heats jointly, and 20 when by the sludge of low temperature by feeding DEG C are heated to 80 DEG C, and condensed water is pre- by sludge
Temperature is reduced to 50 DEG C from 100 DEG C hereinafter, be then discharged from system after hot transport device, carries out depth to peripheral sewerage
Processing.
S2, heating evaporation, the sludge raw material after preheating are transported in the loading hopper of sludge heating evaporation chamber inlet, are led to
It crosses the airlock below funnel to enter in sludge heating evaporation room, the pressure of sludge heating evaporation room maintains the micro- negative of 90kpa
Pressure, in sludge heating evaporation room, for the sludge of high temperature under the action of hollow blade and agitating shaft, sludge compresses list with from MVR
The high-temperature heating steam of increasing temperature and pressure carries out heat exchange after the compression of member conveying, and the moisture wrapped up in sludge is become water by thermal evaporation
Steam enters cyclone dust collectors from the steam (vapor) outlet pipeline above vaporization chamber.Sludge is under the stirring action of hollow blade by import
To exit movement, moisture content is reduced to 30% from the 80% of entrance, the Blowing stopper that the sludge after drying is exported by vaporization chamber
Transfer out system, dewatered sludge yield is 0.57t/h, water content 30%, high-temperature heating steam in agitating shaft and blade and dirty
It is condensed into 100 DEG C or so of condensed water after mud heat exchange, is discharged by drainage pipeline, subsequently into water storage device, is transmitted back to dirt
Mud preheating transport dress preheats sludge raw material.During heating evaporation, by adjusting the power of MVR compression unit and adding
The revolving speed of hollow slurry and shaft in thermal evaporation room, to adjust rate of drying and degree of drying.
S3, secondary steam compression, sludge heating evaporation room produce the secondary steaming that flow is 1.43t/h after heating sludge
Vapour, pressure 90kpa, temperature are 97 DEG C, and the secondary steam once passes through cyclone dust collectors and hydrofilter is sufficiently net
After change, into MVR water vapour compressor, MVR water vapour compressor be it is a kind of using MVR technology improve water vapour heat content to will
Device of the obtained high-temperature high-pressure steam as new heat source, into MVR water vapour compressor secondary steam after compression, rise
Temperature rise is depressed into 143 DEG C of pressure 400kpa, temperature, and then the paddle shaft and collet into sludge heating evaporation room are interior carries out with sludge
Heat exchange, temperature, which reduces, becomes condensed water, flows into water storage device, and condensed water yield is 1.43t/h.
S4, tail gas clean-up, sludge can generate the tail gas not condensed sufficiently on a small quantity in evaporative drying process, be gathered in condensation
Above water pot, tail gas condenser is entered by conveyance conduit, carries out heat exchange, the temperature of tail gas with cooling water in tail gas condenser
Degree is down to 60 DEG C from 143 DEG C hereinafter, then entering in tail gas absorber, qualified tail gas discharge system after absorption.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of energy-saving sludge drying system, which is characterized in that steamed including sequentially connected sludge preheating unit, sludge heating
Bill member, MVR compression unit and tail gas treating unit.
2. energy-saving sludge drying system according to claim 1, which is characterized in that the sludge preheating unit includes phase
The sludge preheating transport device and water storage device to connect.
3. energy-saving sludge drying system according to claim 2, which is characterized in that the sludge preheats transport device and is
Screw conveyor with collet is connected with condensed water and secondary steam in the collet.
4. energy-saving sludge drying system according to claim 3, which is characterized in that the sludge heating evaporation unit packet
Sequentially connected sludge heating evaporation room, cyclone dust collectors and hydrofilter are included, sludge heating evaporation room is connected to institute
State sludge preheating transport device and water storage device.
5. energy-saving sludge drying system according to claim 4, which is characterized in that sludge heating evaporation room is tool
There is the hollow blade dryer of collet, cross-compound arrangement, the hollow blade dryer includes shell, and the enclosure interior is provided with
Transmission shaft, hollow blade is provided with outside the transmission shaft, and the transmission shaft is connected with driving mechanism, the case top setting
There is sludge import.
6. energy-saving sludge drying system according to claim 5, which is characterized in that the MVR compression unit is water steaming
Vapour compressor, the water vapour compressor are connect with sludge heating evaporation room and hydrofilter.
7. energy-saving sludge drying system according to claim 6, which is characterized in that the tail gas treating unit includes tail
Gas condenser and tail gas absorber, the tail gas condenser are connected to the water storage device.
8. a kind of method using the dry sludge of the described in any item energy-saving sludge drying systems of claim 1-7, feature
It is, includes the following steps:
S1, sludge preheating, sludge preheating unit is by sludge raw material preheating to 80 DEG C or more；
S2, heating evaporation, the sludge raw material after preheating are dry by 80% by the moisture content of sludge in sludge heating evaporation unit
To not higher than 30%；
S3, secondary steam compression pass through MVR compression unit pressure after the secondary steam purification for generating sludge heating evaporation unit
Contracting, increasing temperature and pressure, reuse to sludge heating evaporation unit；
S4, tail gas clean-up, not condensing sufficiently is after it is handled by tail gas treating unit, and temperature reduces, discharge system.
9. drying method for sludge according to claim 8, which is characterized in that the pressure in the sludge heating evaporation unit
For 90kpa, temperature is 97 DEG C；Compressed secondary steam pressure rises to 400kpa, and 143 DEG C of temperature.
10. drying method for sludge according to claim 9, which is characterized in that in the step S4, exhaust temperature is by 143
DEG C it is down to 60 DEG C or less.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910179183.0A CN109761474A (en) | 2019-03-11 | 2019-03-11 | Energy-saving sludge drying system and drying method for sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910179183.0A CN109761474A (en) | 2019-03-11 | 2019-03-11 | Energy-saving sludge drying system and drying method for sludge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482826A (en) * | 2019-07-19 | 2019-11-22 | 中国市政工程中南设计研究总院有限公司 | Sludge step anhydration system and method based on MVR Yu vacuum combination technique |
| CN111039536A (en) * | 2019-12-25 | 2020-04-21 | 海南捷信环境工程有限公司 | Energy-efficient sludge heat drying dewatering device |
| CN115594428A (en) * | 2022-10-26 | 2023-01-13 | 宜都兴发化工有限公司（Cn） | Phosphogypsum MVR drying device and method |
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| CN102311216A (en) * | 2011-08-23 | 2012-01-11 | 郭少仪 | Separated thermal cycle sludge dry method and device thereof |
| CN102992575A (en) * | 2012-12-14 | 2013-03-27 | 中国石油天然气集团公司 | Steam thermal cycle sludge drying method and system |
| CN103708697A (en) * | 2012-09-28 | 2014-04-09 | 中国科学院理化技术研究所 | Mechanical vapor recompression (MVR) heat pump sludge drying system |
| CN104671633A (en) * | 2015-03-16 | 2015-06-03 | 天华化工机械及自动化研究设计院有限公司 | Steam condensate preheating and steam drying two-stage energy-saving sludge drying method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102311216A (en) * | 2011-08-23 | 2012-01-11 | 郭少仪 | Separated thermal cycle sludge dry method and device thereof |
| CN103708697A (en) * | 2012-09-28 | 2014-04-09 | 中国科学院理化技术研究所 | Mechanical vapor recompression (MVR) heat pump sludge drying system |
| CN102992575A (en) * | 2012-12-14 | 2013-03-27 | 中国石油天然气集团公司 | Steam thermal cycle sludge drying method and system |
| CN104671633A (en) * | 2015-03-16 | 2015-06-03 | 天华化工机械及自动化研究设计院有限公司 | Steam condensate preheating and steam drying two-stage energy-saving sludge drying method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482826A (en) * | 2019-07-19 | 2019-11-22 | 中国市政工程中南设计研究总院有限公司 | Sludge step anhydration system and method based on MVR Yu vacuum combination technique |
| CN111039536A (en) * | 2019-12-25 | 2020-04-21 | 海南捷信环境工程有限公司 | Energy-efficient sludge heat drying dewatering device |
| CN115594428A (en) * | 2022-10-26 | 2023-01-13 | 宜都兴发化工有限公司（Cn） | Phosphogypsum MVR drying device and method |
| CN115594428B (en) * | 2022-10-26 | 2023-11-24 | 宜都兴发化工有限公司 | Phosphogypsum MVR drying device and method |
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Application publication date: 20190517 |