CN102161561A - High-efficiency pollution-free municipal sludge superheated steam combined drying device - Google Patents
High-efficiency pollution-free municipal sludge superheated steam combined drying device Download PDFInfo
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- CN102161561A CN102161561A CN2011101168735A CN201110116873A CN102161561A CN 102161561 A CN102161561 A CN 102161561A CN 2011101168735 A CN2011101168735 A CN 2011101168735A CN 201110116873 A CN201110116873 A CN 201110116873A CN 102161561 A CN102161561 A CN 102161561A
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Abstract
The invention discloses a high-efficiency pollution-free municipal sludge superheated steam combined drying device. A stem generator is connected with a steam drum through a throttle valve; the steam drum is merged with an airflow loop through the throttle valve and is connected with a convection dryer; a material discharger is connected on the lower part of a separator and is connected into the convection dryer through a conduit; a throttle valve is connected in parallel at a position, which is close to a fan, in the airflow loop and is connected with a conduction dryer; and the conduction dryer is sequentially connected with the separator and a condenser. The device has the advantages that: (1) the cascade utilization of the energy is realized, and the energy efficiency is higher than that of single-stage drying; (2) no harmful gas is discharged, and the secondary pollution is avoided; and (3) the low-temperature steam generated in the conduction drying process is also cooled through the condenser, so that the steam is turned into condensed water, no harmful gas is discharged, and the zero emission of harmful gas in the drying process is realized.
Description
Technical field
The present invention relates to a kind of municipal sludge drying installation, relate in particular to a kind of municipal sludge superheated vapour efficient pollution-free combined dryer.
Background technology
Along with China's economy develops the quickening of crossing the city with urbanization rapidly, the scale of municipal sewage treatment constantly enlarges, and the sewage disposal degree raises year by year, and sludge yield also sharply increases.According to the Environmental Protection Department recent statistics, the town sewage treatment facility that has put into operation by China in 2007 reaches 1178, general design processing power 7,243 ten thousand ton per days, and dispose of sewage 5,320 ten thousand tons average every day.Estimation in view of the above, the whole nation produced about 1,460 ten thousand tons of mud (80% water ratio mud cake) in 2007.The growing with each passing day seriously to fall behind with the wretched insufficiency of sludge treatment ability, processing means of mud generation forms sharp-pointed contradiction, a large amount of wet mud is arbitrarily transported outward, simply landfill or stacking, cause many cities the phenomenon in " mud besieged city " to occur, the sludge treatment problem has become the urban environment problem that China can't avoid." crisis of mud landfill " of reservoir area of Three Gorges was exactly the outstanding reflection of this problem in recent years.
Contain a large amount of pathogenic bacterias, parasite (ovum) in the mud, heavy metals such as copper, zinc, cadmium, mercury, difficult degradation venomous injurants such as salt and polychlorobiphenyl, dioxin, radionuclide.Simultaneously, owing to contain high-enriched organics such as amounts of protein, fat and carbohydrate in the mud, the viscosity that causes mud is big, higher, the solid-liquid separation poor performance of water ratio, and the dehydrated sludge cake water ratio is up to about 80% usually.Present general sludge treatment technology is to dewater or digest or directly handle all to face the difficult problem that efficient is low, energy consumption is high.At present, the means of sludge disposal mainly comprise compost, landfill and burning.The dehydrated sludge cake of water ratio 80% all should not be directly handled in landfill, compost and burning, and for satisfying disposal standard and arts demand, water ratio will be reduced to below 60% at least.How efficient low-consume ground is reduced to 60% with moisture percentage in sewage sludge by 80%, becomes the key problem in technology that ensures that mud is effectively disposed.
Hot steam drying (Superheated Steam Drying) is a new technology that latest developments are got up, and it is meant a kind of drying mode that utilizes superheated vapour directly to remove moisture with being contacted by dry material.Compare with traditional warm air drying, as drying medium, the waste gas that drying machine is discharged all is steam to superheat steam drying with water vapour, utilize the latent heat that the method for condensation can recovered steam to be used, thereby thermo-efficiency is higher again.And because the thermal capacity of water vapour is bigger 1 times than air, the consumption of drying medium obviously reduces, so unit heat consumption is low.Introduce according to the chairman Mujumdar of the dry association in the world, the unit heat consumption of superheat steam drying only is a 1000-1500KJ/kg water, is 1/3 of the air-dry scorching consumption of ordinary hot, is a kind of very promising dry new technology.
Summary of the invention
The object of the present invention is to provide a kind of municipal sludge superheated vapour efficient pollution-free combined dryer, solved that energy consumption height, exhaust emissions that the traditional drying mode is applied to exist in the sewage sludge drying produce and technical barrier such as inferior pollution and time of drying are long, efficient is low.Superheat steam drying, because entire environment only has a kind of gaseous constituent to exist, moisture moves the diffusion that is not by matter from the material surface evaporation but is used as power with the volume flow (bulk flow) that the pressure difference of liquid stream produces, and superheat steam drying does not have the air film resistance to mass transfer.Therefore, adopting the unit heat consumption of superheat steam drying sewage sludge only is 1/3 of the air-dry scorching consumption of ordinary hot.
Two of purpose of the present invention is because drying medium is the pyritous superheated vapour, does not contain oxygen in the drying medium, can realize the dry environment of anaerobic.Contain high-enriched organics such as amounts of protein, fat and carbohydrate in the mud, and pathogenic bacteria, parasite (ovum), heavy metals such as copper, zinc, cadmium, mercury, salt and polychlorobiphenyl, etc. venomous injurant.Superheat steam drying does not have oxidation and combustion reactions because no air exists.Do not have danger on fire from explosion for the drying process of sewage sludge, solved the risk on fire from explosion that exists in the sewage sludge high temperature drying process.Because overheating steam drying process does not have oxygen, avoided the oxidizing reaction of drying process mud to produce CO, NOx and SO simultaneously
2Deng toxic gas.
Three of purpose of the present invention is to adopt convection current and conduction combined drying technology to make full use of the secondary steam that drying process produces.In overheating steam drying process, if not loss of moisture evaporated will become the lower excess steam of heat content.Utilizing these unnecessary steam economically, is the key that further improves the superheat steam drying energy-saving efficiency.Particularly to the drying of picture sewage sludge, because of it contains a large amount of moisture, the excess steam amount is big, how to utilize the steam of these low heat contents just to seem more important.The present invention adopts secondary combined drying technology, hyperthermia and superheating steam convection drying is adopted in the second stage, and the excess steam that drying process produces has been used the cascaded utilization of energy principle as the thermal source of first step conductive drying, the latent heat of superheated vapour is fully utilized, and has improved the efficiency of dehumidification system.
Four of purpose of the present invention is that drying medium is a superheated vapour, secondary adopts hyperthermia and superheating steam convection drying, the excess steam that drying process produces is as the thermal source of first step conductive drying, the excess steam that secondary drying produces is a water of condensation at one-level moisture eliminator internal cooling, be expelled back into sewage work, a spot of exhaust gas emission is only arranged.The dry conductive drying mode that adopts of the first step, drying process does not have the required drying medium of convection drying, the water vapour that only has drying process to produce, water vapour flows back to sewage work equally through after becoming cold water after the condensation.Whole drying process can be carried out under air-tight state, has realized the waste gas zero release substantially.
Five of purpose of the present invention is to adopt the pyritous superheated vapour as drying medium, and superheat steam temperature height, heat enthalpy value are big, have intensive sterilization effect.Material temperature surpasses 300 ℃ during superheat steam drying work, can not only be dry under such temperature to sewage sludge, and can eliminating bacteria and other poisonous microorganisms.
The present invention is achieved like this, it comprises the conductive drying device, feeder, comvection dryer, separator, blower fan, throttling valve, strainer, well heater, vapour generator, steam pockets, removal device, the discharge port below that it is characterized in that the conductive drying device is provided with feeder, the discharge port below of feeder is provided with comvection dryer, the top of comvection dryer connects separator by conduit, separator, blower fan, throttling valve, strainer, well heater, the sidewall below of throttling valve and comvection dryer is in turn connected to form gas flow loop, vapour generator connects steam pockets through throttling valve, steam pockets connects comvection dryer through throttling valve combined gas streams loop, described separator below connects removal device, removal device inserts in the comvection dryer by conduit, connect the conductive drying device near a blower fan place throttling valve in parallel in the gas flow loop, the conductive drying device is connected with condenser with separator successively.
Level is provided with sieve plate with holes in the described comvection dryer, and sieve plate top with holes is provided with raker stirrer, and the end of raker stirrer is provided with removal device.
Technique effect of the present invention is: (1) mud is realized high temperature drying in the superheated vapour comvection dryer, improved exsiccant efficient, unnecessary superheated vapour has been realized the cascade utilization of energy as the thermal source of low temperature conductive drying device, and energy efficiency is higher than the single-stage drying; (2) latent heat of the hyperthermia and superheating steam of the surplus that produces in the convection drying process is utilized by low temperature conductive drying process, unnecessary superheated vapour is condensed into water of condensation in the conductive drying process and enters Sewage treatment systems, no obnoxious flavour is discharged, and can not produce secondary pollution; (3) Low Temperature Steam of conductive drying process generation cools off by condenser equally, and steam is become water of condensation, does not produce discharge of harmful gases, has realized the zero release of drying process obnoxious flavour.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
As shown in Figure 1, the present invention is achieved like this, the discharge port below of conductive drying device 1 is provided with feeder 2, the discharge port below of feeder 2 is provided with comvection dryer 3, the top of comvection dryer 3 connects separator 4 by conduit, separator 4, blower fan 5, throttling valve 6, strainer 7, well heater 8, the sidewall below of throttling valve and comvection dryer 3 is in turn connected to form gas flow loop, vapour generator 9 connects steam pockets 10 through throttling valve, steam pockets 10 connects comvection dryer through throttling valve combined gas streams loop, 4 sides connect removal device 11 under the described separator, removal device 11 inserts in the comvection dryer 3 by conduit, connect the conductive drying device near a blower fan place throttling valve in parallel in the gas flow loop, level is provided with sieve plate with holes in the described comvection dryer, sieve plate top with holes is provided with raker stirrer, the end of raker stirrer is provided with removal device, and conductive drying device 1 is connected with condenser 14 with separator successively.
Municipal sludge superheated vapour efficient pollution-free combined drying method of the present invention is following steps successively:
The motion flow process of mud in the drying process: (1) wet mud is entered in the moisture eliminator based on conduction heating by charging opening, under the heating of the unnecessary superheated vapour that in coming from the convection drying process, produces, mud is passed through conduction heating by steam, sludge part moisture is evaporated, and obtains the mud of preliminary hydro-extraction;
(2) mud through preliminary hydro-extraction has the thermal conduction moisture eliminator to flow out, and is delivered in the convection current superheat steam drying device by feeder again, and under the effect of hyperthermia and superheating steam, mud is further dry, meets the requirements of moisture and discharges outside the drying machine.
The motion flow process of drying process superheated vapour: (3) initial steam comes from vapour generator, and initial steam heats the moisture evaporation that makes in the mud through behind the moisture eliminator to the mud in the drying machine;
(4) after the vapor mixing of initial steam and mud evaporation, remove ash content in the steam, under the effect of recirculation blower, become and have the high superheated vapour of water absorbability by well heater through separator.Superheated vapour constantly evaporates its moisture by mud again, and the superheated vapour amount constantly increases, and has formed excessive steam in the convection drying device;
(5) the unnecessary superheated vapour that produces in the convection drying process is incorporated into by pipeline H in the one-level conductive drying machine, and as the thermal source of a grade low-temp conductive drying, process is carried out the conduction exchange of heat with the low temperature sludge in the conductive drying device.Unnecessary superheated vapour has just become water of condensation, and water of condensation enters sludge treating system.After the latent heat second stage employ of the excess steam that the superheated vapour convection current of mud and conduction combined drying produce drying process, become water of condensation through condenser and discharge dehumidification system, do not have dry discarded discharging, and the latent heat of dry waste gas obtains second stage employ, improve the exsiccant energy efficiency widely.
The present invention adopts the drying mode of convection current and conduction associating, solves the problem of utilizing of excess steam in the overheating steam drying process, can make full use of the latent heat of excess steam, improves sewage sludge exsiccant efficient.Utilize superheated vapour can realize the advantage of closed-loop operation, make the drying process of sewage sludge not have exhaust gas emission, solved the difficult problem of sewage sludge traditional drying vent gas treatment.Drying process as drying medium, realizes the anaerobic drying with steam, and the drying operation temperature is more than 300 ℃, and the drying efficiency height does not exist mud hot blast high temperature drying process to produce the risk of dioxin.
Claims (2)
1. municipal sludge superheated vapour efficient pollution-free combined dryer, it comprises the conductive drying device, feeder, comvection dryer, separator, blower fan, throttling valve, strainer, well heater, vapour generator, steam pockets, removal device, the discharge port below that it is characterized in that the conductive drying device is provided with feeder, the discharge port below of feeder is provided with comvection dryer, the top of comvection dryer connects separator by conduit, separator, blower fan, throttling valve, strainer, well heater, the sidewall below of throttling valve and comvection dryer is in turn connected to form gas flow loop, vapour generator connects steam pockets through throttling valve, steam pockets connects comvection dryer through throttling valve combined gas streams loop, described separator below connects removal device, removal device inserts in the comvection dryer by conduit, connect the conductive drying device near a blower fan place throttling valve in parallel in the gas flow loop, the conductive drying device is connected with condenser with separator successively.
2. municipal sludge superheated vapour efficient pollution-free combined dryer according to claim 1 is characterized in that level is provided with sieve plate with holes in the described comvection dryer, and sieve plate top with holes is provided with raker stirrer, and the end of raker stirrer is provided with removal device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101168735A CN102161561A (en) | 2011-05-07 | 2011-05-07 | High-efficiency pollution-free municipal sludge superheated steam combined drying device |
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| CN2011101168735A CN102161561A (en) | 2011-05-07 | 2011-05-07 | High-efficiency pollution-free municipal sludge superheated steam combined drying device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102875002A (en) * | 2012-10-17 | 2013-01-16 | 冯本剑 | Sludge drying device and sludge treatment system |
| CN102936088A (en) * | 2012-10-23 | 2013-02-20 | 南昌航空大学 | Sludge superheated steam triple-effect combined drying device |
| CN103964671A (en) * | 2013-01-25 | 2014-08-06 | 宝山钢铁股份有限公司 | Sludge drying apparatus and method for drying sludge by using sludge drying apparatus |
| CN106517726A (en) * | 2016-12-26 | 2017-03-22 | 南昌航空大学 | Two-stage sludge drying device and method |
| CN111425762A (en) * | 2020-03-30 | 2020-07-17 | 南昌航空大学 | Mechanical dewatered sludge oil film resistance-reducing pipeline conveying device and using method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823830A (en) * | 2010-04-06 | 2010-09-08 | 东南大学 | Sewage sludge drying device with superheated steam loop circulation and drying method |
-
2011
- 2011-05-07 CN CN2011101168735A patent/CN102161561A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823830A (en) * | 2010-04-06 | 2010-09-08 | 东南大学 | Sewage sludge drying device with superheated steam loop circulation and drying method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102875002A (en) * | 2012-10-17 | 2013-01-16 | 冯本剑 | Sludge drying device and sludge treatment system |
| CN102875002B (en) * | 2012-10-17 | 2014-05-14 | 冯本剑 | Sludge drying device and sludge treatment system |
| CN102936088A (en) * | 2012-10-23 | 2013-02-20 | 南昌航空大学 | Sludge superheated steam triple-effect combined drying device |
| CN103964671A (en) * | 2013-01-25 | 2014-08-06 | 宝山钢铁股份有限公司 | Sludge drying apparatus and method for drying sludge by using sludge drying apparatus |
| CN103964671B (en) * | 2013-01-25 | 2015-12-09 | 宝山钢铁股份有限公司 | A kind of mud drying device and utilize the method for this device dewatered sludge |
| CN106517726A (en) * | 2016-12-26 | 2017-03-22 | 南昌航空大学 | Two-stage sludge drying device and method |
| CN111425762A (en) * | 2020-03-30 | 2020-07-17 | 南昌航空大学 | Mechanical dewatered sludge oil film resistance-reducing pipeline conveying device and using method thereof |
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Application publication date: 20110824 |