CN106673392A - Low-temperature sludge drying technology - Google Patents
Low-temperature sludge drying technology Download PDFInfo
- Publication number
- CN106673392A CN106673392A CN201610818896.3A CN201610818896A CN106673392A CN 106673392 A CN106673392 A CN 106673392A CN 201610818896 A CN201610818896 A CN 201610818896A CN 106673392 A CN106673392 A CN 106673392A
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- air
- temperature
- heat
- sludge
- sludge drying
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a low-temperature sludge drying technology and relates to the field of a sludge drying technology. The technology comprises the following steps: crushing wet sludge and carrying out extrusion moulding, entering a belt-type sludge drying box, carrying out heat transfer and mass transfer with hot dry circulating air to obtain dry sludge and wet low-temperature circulating air, inhaling the wet low-temperature circulating air into a heat pump through a circulating fan, further lowering temperature by heat exchange between the air blown from a circulating fan into an intermediate heat exchanger and evaporated outlet air, discharging air out of the intermediate heat exchanger, lowering temperature by a water-cooling pre-cooling coil pipe, evaporating by an evaporator after air-out, separating out condensed water, carrying out heat exchange between evaporated outlet air and heat-pump return air through an intercooler, raising air-outlet temperature and then entering a condenser, and letting hot dry air obtained after temperature rise enter a band-type sludge drying oven for cycling treatment. The invention has the following advantages: energy consumption is low; there is no secondary pollution; drying temperature is low; safety is high; degree of automation is high; and sludge drying cost is reduced.
Description
Technical field
The present invention relates to sludge drying technique field, and in particular to low temperature sludge stoving process.
Background technology
Sludge drying is the necessary pilot process of Treatment of Sludge, from directly burning is applied directly to, is applied from after mummification, is arrived
Burn after mummification, gasify after mummification up to date, substantially affirmed mummification as the important of necessary pilot process
Property.Its reason mainly has two：Decrement, or energy resource consumption decrement are disposed in economy, either transport；Wholesomeness, it is agricultural
Essential condition.Sludge drying final disposal mode is the selection of national conditions, and landfill is undoubtedly worthless, and this is not only in that soil valency
Value is expensive, and mainly or from from the aspect of the energy and bio-energy resource, national requirements reduces and limit the landfill of sludge.
Major part industry sludge dewatering at present is only with mechanical extruding type sludge dewatering, such as belt filter press, plate and frame pressure
Filter, folded spiral shell machine and centrifugal drier, its dehydrated sludge moisture content is in 70%-90% or so；Select to burn as at
Put means, the sludge shortage of heat of itself to maintain its heat demand, so such sludge for follow-up storage, transport
And burn for it is less economical, this is the major reason for causing current sludge treatment high cost, to enterprise's sludge be dried loss of weight,
The requirement of volume reduction increasingly increases severely.
At present country's sludge drying process, technology are evolving, and the energy mode of employing is mainly direct-heating type residence
It is many, i.e., sludge is heated to into more than 100 DEG C using forms such as steam, flue tail gas, electrical heating, the moisture content for making sludge is changed into water steaming
Gas is discharged；There is problems with the form drying unit：
(1) high energy consumption：Energy requirement is every liter of kilocalorie of evaporation capacity subsistence level 620, at direct-heating type drying equipment
It is 800-850 kilocalories that reason trade mark claims the thermal demand of its system.
(2) secondary pollution is brought：Drying sludge brings the tail gas of contaminative to need to process device again simultaneously can be up to standard
Discharge.
(3) drying temperature height brings drying safety problem：The thing that sludge may be evaporated in high temperature drying sludge air-flow
The problems such as matter blast, toxicity, is difficult to avoid that.
Based on this, a kind of low temperature sludge stoving process is designed particularly necessary.
The content of the invention
For not enough present on prior art, the present invention seeks to be to provide a kind of low temperature sludge stoving process, energy
Consumption is low, and non-secondary pollution, drying temperature is low, safe, and drying automation degree is high, substantially reduces sludge drying cost, easily
In promoting the use of.
To achieve these goals, the present invention is by the following technical solutions realizing：Low temperature sludge stoving process, its
Processing step is：(1) wet mud of moisture content 60%-80% is entered into belt type sludge drying baker through crushing, after extruded moulding；
(2) wet mud in belt type sludge drying baker is changed into moisture content Jing after with the dry cycle air heat-exchange obversion of heat
Less than 30% dewatered sludge, the dry cycle air of heat is changed into wet cold cycle air；
(3) wet cold cycle air Jing circulating fans suction heat pump, and be blown into Intermediate Heat Exchanger and steam from circulating fan
Sending wind and doing heat exchange further reduces temperature；
(4) the cold cycle air after lowering the temperature reduces again temperature from Intermediate Heat Exchanger air-out through water-cooled desuperheating coil；
(5) from the air-out of water-cooled desuperheating coil through evaporator evaporation, temperature is down to below dew point, so as to condensed water precipitation；
(6) evaporate air-out and do heat exchange through intercooler and heat pump return air, lifted and enter after leaving air temp condenser；
(7) circulation air for being changed into the drying of heat after circulated air is further heated up by condenser is dried into belt type sludge
Case, realizes circular treatment.
Preferably, the temperature of the dry cycle air of the heat is 60-70 DEG C, humidity is below 20%, and Jing belts are dirty
The wet cold cycle air themperature that heat pump is entered after the process of mud drying baker is 50-60 DEG C, and humidity is more than 50%.
Beneficial effects of the present invention：(1) energy consumption is low：Using hot pump in low temp drying plant, due to refrigerating capacity and system in heat pump
Heat is all used for sludge drying, therefore energy consumption is compared to direct-heating type high energy consumption more than 50%.
(2) non-secondary pollution：Sludge moisture content is emitted eventually through the form of condensed water, and wind is by recycling, nothing
Exogenous QI discharges secondary pollution problem.
(3) drying temperature is low, reduces safety problem：Because drying temperature is less than 70 DEG C, the thing that sludge may be evaporated
The problems such as matter blast, toxicity, is few, and the sludge suitability is wide, and stable equipment operation, mobility are high.
(4) automatic capability is high：Sludge drying is effectively realized that continuous and automatic runs by the equipment design form, and sludge is done
Change process avoids the input of manpower, reduces labor strength, reduces cost.
Description of the drawings
With reference to the accompanying drawings and detailed description describing the present invention in detail；
Fig. 1 is the process chart of the present invention.
Specific embodiment
Technological means, creation characteristic, reached purpose and effect to make present invention realization is easy to understand, with reference to
Specific embodiment, is expanded on further the present invention.
With reference to Fig. 1, this specific embodiment is employed the following technical solutions：Low temperature sludge stoving process, its processing step is：
(1) sludge drying：1. the wet mud of moisture content 60%-80% is entered into belt type sludge drying baker through crushing, after extruded moulding；
2. the wet mud in belt type sludge drying baker is changed into moisture content Jing after with the dry cycle air heat-exchange obversion of heat
Less than 30% dewatered sludge, the dry cycle air of heat is changed into wet cold cycle air, wherein hot dry cycle air
Temperature is 60-70 DEG C, and below 20%, the wet cold cycle air themperature Jing after the process of belt type sludge drying baker is humidity
50-60 DEG C, humidity is more than 50%.
(2) circulation air heat pump is processed：
1. it is 50-60 DEG C by the temperature produced Jing after sludge drying and processing, wet cold cycle of the humidity more than 50% is empty
Gas Jing circulating fans suck heat pump, and are blown into Intermediate Heat Exchanger from circulating fan and do heat exchange and further reduce temperature with evaporation air-out
Degree；
2. the cold cycle air after lowering the temperature reduces again temperature from Intermediate Heat Exchanger air-out through water-cooled desuperheating coil；
3. from the air-out of water-cooled desuperheating coil through evaporator evaporation, temperature is down to below dew point, so as to condensed water precipitation；
4. evaporate air-out and do heat exchange through intercooler and heat pump return air, lifted and enter after leaving air temp condenser；
5. the circulation air for being changed into the drying of heat after circulated air is further heated up by condenser enters belt type sludge baking oven,
Realize circular treatment.
This specific embodiment compared to current direct-heating type drying equipment Treatment of Sludge mode, using hot pump in low temp
Drying plant, because refrigerating capacity and heating capacity are all used for sludge drying in heat pump, therefore energy consumption is lower, and sludge moisture content eventually through
The form of condensed water is emitted, and wind discharges secondary pollution problem, energy-conservation and ring by recycling without traditional exogenous QI
Protect, stable equipment operation, high degree of automation, with wide market application foreground.
The ultimate principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description this
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement is both fallen within scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (2)
1. low temperature sludge stoving process, it is characterised in that its processing step is：(1) by wet mud Jing of moisture content 60%-80%
Cross after broken, extruded moulding and enter belt type sludge drying baker；
(2) wet mud in belt type sludge drying baker Jing with heat dry cycle air heat-exchange obversion after be changed into moisture content 30% with
Under dewatered sludge, heat dry cycle air be changed into wet cold cycle air；
(3) wet cold cycle air Jing circulating fans suction heat pump, and be blown into Intermediate Heat Exchanger and evaporate from circulating fan
Wind does heat exchange and further reduces temperature；
(4) the cold cycle air after lowering the temperature reduces again temperature from Intermediate Heat Exchanger air-out through water-cooled desuperheating coil；
(5) from the air-out of water-cooled desuperheating coil through evaporator evaporation, temperature is down to below dew point, so as to condensed water precipitation；
(6) evaporate air-out and do heat exchange through intercooler and heat pump return air, lifted and enter after leaving air temp condenser；
(7) circulation air for being changed into the drying of heat after circulated air is further heated up by condenser enters belt type sludge baking oven, real
Existing circular treatment.
2. low temperature sludge stoving process according to claim 1, it is characterised in that the temperature of the dry cycle air of the heat
Spend for 60-70 DEG C, humidity enters the wet cold cycle Air Temperature of heat pump Jing after the process of belt type sludge drying baker below 20%
Spend for 50-60 DEG C, humidity is more than 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610818896.3A CN106673392A (en) | 2016-08-30 | 2016-08-30 | Low-temperature sludge drying technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610818896.3A CN106673392A (en) | 2016-08-30 | 2016-08-30 | Low-temperature sludge drying technology |
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| CN106673392A true CN106673392A (en) | 2017-05-17 |
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| CN201610818896.3A Pending CN106673392A (en) | 2016-08-30 | 2016-08-30 | Low-temperature sludge drying technology |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285592A (en) * | 2017-07-05 | 2017-10-24 | 哈尔滨工业大学 | A kind of double-stage tandem type heat pump sludge drier |
| CN107445437A (en) * | 2017-08-15 | 2017-12-08 | 苏州工业园区荣昕环保设备厂 | A kind of low temperature infrared ray sludge drying system and method |
| CN108426426A (en) * | 2018-05-15 | 2018-08-21 | 武汉都市环保工程技术股份有限公司 | A kind of sludge dehumidification type multistage recuperation of heat anhydration system |
| CN108585411A (en) * | 2018-04-18 | 2018-09-28 | 广东芬尼克兹环保科技有限公司 | A kind of sludge drying system based on heat pump techniques |
| CN109734278A (en) * | 2018-10-17 | 2019-05-10 | 杭州川恩环保技术有限公司 | A kind of sludge at low temperature drying process and sludge at low temperature drying machine |
| CN109928595A (en) * | 2019-03-28 | 2019-06-25 | 北京科技大学 | Sludge deep drying method and system based on low-temperature heat source |
| CN110395875A (en) * | 2019-08-21 | 2019-11-01 | 东北大学 | A kind of novel sludge dry system and method |
| CN108585411B (en) * | 2018-04-18 | 2024-04-26 | 广东芬蓝环境科技有限公司 | Sludge drying system based on heat pump technology |
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| CN201037728Y (en) * | 2007-04-28 | 2008-03-19 | 绍兴水处理发展有限公司 | Combined sludge drying device |
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| CN105084708A (en) * | 2015-08-06 | 2015-11-25 | 石曾矿 | Low-temperature box type dryer for sludge |
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Patent Citations (5)
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| CN201037728Y (en) * | 2007-04-28 | 2008-03-19 | 绍兴水处理发展有限公司 | Combined sludge drying device |
| CN101955310A (en) * | 2009-07-20 | 2011-01-26 | 浙江绿治污泥处理技术有限公司 | Sludge dewatering method and special oven thereof |
| CN103553291A (en) * | 2013-11-11 | 2014-02-05 | 北京纬纶华业环保科技股份有限公司 | Low-temperature sludge drying treatment system and technology |
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| CN105084708A (en) * | 2015-08-06 | 2015-11-25 | 石曾矿 | Low-temperature box type dryer for sludge |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285592A (en) * | 2017-07-05 | 2017-10-24 | 哈尔滨工业大学 | A kind of double-stage tandem type heat pump sludge drier |
| CN107445437A (en) * | 2017-08-15 | 2017-12-08 | 苏州工业园区荣昕环保设备厂 | A kind of low temperature infrared ray sludge drying system and method |
| CN108585411A (en) * | 2018-04-18 | 2018-09-28 | 广东芬尼克兹环保科技有限公司 | A kind of sludge drying system based on heat pump techniques |
| CN108585411B (en) * | 2018-04-18 | 2024-04-26 | 广东芬蓝环境科技有限公司 | Sludge drying system based on heat pump technology |
| CN108426426A (en) * | 2018-05-15 | 2018-08-21 | 武汉都市环保工程技术股份有限公司 | A kind of sludge dehumidification type multistage recuperation of heat anhydration system |
| CN109734278A (en) * | 2018-10-17 | 2019-05-10 | 杭州川恩环保技术有限公司 | A kind of sludge at low temperature drying process and sludge at low temperature drying machine |
| CN109734278B (en) * | 2018-10-17 | 2022-03-11 | 杭州川恩环保技术有限公司 | Sludge low-temperature drying process and sludge low-temperature dryer |
| CN109928595A (en) * | 2019-03-28 | 2019-06-25 | 北京科技大学 | Sludge deep drying method and system based on low-temperature heat source |
| CN109928595B (en) * | 2019-03-28 | 2021-02-02 | 北京科技大学 | Sludge deep drying method and system based on low-temperature heat source |
| CN110395875A (en) * | 2019-08-21 | 2019-11-01 | 东北大学 | A kind of novel sludge dry system and method |
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