CN102718376B - Device and method for performing hydrothermal pretreatment on sludge - Google Patents
Device and method for performing hydrothermal pretreatment on sludge Download PDFInfo
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- CN102718376B CN102718376B CN 201210234194 CN201210234194A CN102718376B CN 102718376 B CN102718376 B CN 102718376B CN 201210234194 CN201210234194 CN 201210234194 CN 201210234194 A CN201210234194 A CN 201210234194A CN 102718376 B CN102718376 B CN 102718376B
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Abstract
The invention relates to a device and a method for performing hydrothermal pretreatment on sludge. The device comprises two hydrothermal distilling kettles running alternatively. Specific to each run cycle, the method comprises firstly adding dilution water into a first hydrothermal distilling kettle, wherein proper amount of alkali is preferably added; then introducing pressure-released steam from a second hydrothermal distilling kettle into the first hydrothermal distilling kettle to preheat the dilution water; adding dewatered sludge into the first hydrothermal distilling kettle, and simultaneously smashing the dewatered sludge into small pieces to enter the preheated dilution water with uniform dispersion; adding boiler steam into the first hydrothermal distilling kettle in order to achieve stirring and heating of materials; allowing pressure and temperature in the first hydrothermal distilling kettle to rise to reach conditions required by hydrothermal reaction, and keeping the conditions required by the hydrothermal reaction for a certain time to fully hydrolyze and slurry the sludge; and then releasing pressure to discharge the sludge. By means of the device and the method for performing the hydrothermal pretreatment on the sludge, the hydrothermal pretreatment of the dewatered sludge can be effectively achieved, the device operation reliability is high, the heat utilization rate is high, and the flash evaporation operation is not needed.
Description
Technical field:
The present invention relates to the recycling field of giving up admittedly, relate in particular to a kind of hydrothermal pretreatment apparatus and method for mud, especially Gao Hangu (as dehydration) mud.
Background technology:
Municipal sludge refers to the general name of the formed residue of blowing out in settling that the municipal sewage plant produces and sewage surface of floating foam in to sewage treatment process.At present, China's municipal sludge year generation has reached the scale of 3,000 ten thousand tons (with dewatered sludge estimations of water ratio 80%), and to " 12 " latter stage, expectation will reach nearly 5,000 ten thousand tons scale.Yet China's sludge treatment technique is started late, and there is the phenomenon of " the light mud of heavy water " in the early stage sewage work that builds, and the safe handling of mud becomes the weak link in China water pollution control field.
According to external in the correlation technique aspect the sludge treatment, the technological line of containing west 95% above main flow sludge treatment at present has following four kinds: deep dehydration+landfill, mummification+burning+lime-ash landfill or building materials utilization, aerobic fermentation+soil utilization (agricultural is main) and anaerobic digestion+soil utilization (agricultural is main).
Because the social demand of Sustainable development and the support on policy of government department, the center of gravity that current municipal sludge is handled turn to development of resources by polluting control.The anaerobic digestion techniques of mud because of its plurality of advantages that has, has become one of focus of domestic and international sludge treatment.
Dehydrating municipal sludge is handled the formed dewatered sludge in back, and water ratio is about 80% usually, as not dealing carefully with, will cause secondary pollution to environment, also is simultaneously the waste to renewable resources.But dewatered sludge viscosity is big, dewatering is poor, anaerobic digestion performance is also lower, thereby has limited its further stabilization treatment and safe disposal.Therefore, develop a kind of preconditioning technique and device that can promote follow-up dehydration or anaerobic digestion effect, will help to solve the difficult problem of mud subsequent disposal.
Summary of the invention:
The present invention relates to a kind of apparatus and method of the hydrothermal pretreatment for mud, especially Gao Hangu (as dehydration) mud.Described device comprises at least two hydro-thermal distilling kettles, realizes and described method is the alternate run of two hydro-thermal distilling kettles by apparatus of the present invention.
Device for the dewatered sludge hydrothermal pretreatment of the present invention comprises at least two hydro-thermal distilling kettles, and wherein each hydro-thermal distilling kettle comprises opening for feed, destroyer, steam inlet, vapor-nozzle, is used as vapor interface, the discharge port of discharging pressure release steam or introducing afterheat steam and the valve that is used for vapor communication between control and another distilling kettle.
According to the embodiment of the present invention, described device comprise at least the first hydro-thermal distilling kettle and with the second hydro-thermal distilling kettle of the described first hydro-thermal distilling kettle attended operation, the wherein said first hydro-thermal distilling kettle is provided with first opening for feed, first destroyer, first steam inlet, first vapor-nozzle, first discharge port and first vapor interface, and the described second hydro-thermal distilling kettle is provided with second opening for feed, second destroyer, second steam inlet, second vapor-nozzle, second discharge port and second vapor interface; Wherein said first destroyer and described second destroyer are equipped with the material of sending into is pulverized with described first opening for feed and described first opening for feed respectively.At this, " first " and " second " is the statement of relativity.
The described first hydro-thermal distilling kettle and the described second hydro-thermal distilling kettle adopt over-over mode operation in parallel; At the described first hydro-thermal distilling kettle and the described second hydro-thermal distilling kettle comparatively speaking, to the hydro-thermal distilling kettle that wherein is in step of reaction introduce from the pressure release steam of the hydro-thermal distilling kettle that is in the pressure release stage in order to dilution water or/and material carries out preheating.
Utilize device of the present invention, carry out the related main technique operation of method of dewatered sludge hydrothermal pretreatment, in an entire run cycle at each hydro-thermal distilling kettle, comprising:
1) in the first hydro-thermal distilling kettle, adds dilution water, wherein preferably in dilution water, add an amount of alkali, be beneficial to promote the hydrolysis reaction of mud;
2) to the pressure release steam of described first hydro-thermal distilling kettle importing from the described second hydro-thermal distilling kettle, in order to the dilution water in the described first hydro-thermal distilling kettle of preheating;
3) material of dewatered sludge is sent into the first hydro-thermal distilling kettle by pump from the top, make material be broken into fritter by the shredder assembly that arranges at kettle material inlet place and enter in the dilution water that passes through preheating, and be uniformly dispersed;
4) import Boiler Steam to the described first hydro-thermal distilling kettle, realize the stirring of described material and make described material heat temperature raising under the steam stirring action by described first vapor-nozzle, utilize steam to spray into the still internally-powered and realize that material stirs the described material that makes in the still and is in the required temperature and pressure condition of hydro-thermal reaction;
5) make the hold-time that being reflected in described first distilling kettle kept under the described temperature and pressure condition to be needed, so that the abundant hydrolysis of described material and pulp fully;
6) the pressure release steam in the described first hydro-thermal distilling kettle is imported the described second hydro-thermal distilling kettle, in order to the dilution water in the described second hydro-thermal distilling kettle is carried out preheating; And
7) will discharge from the described first hydro-thermal distilling kettle through the material (grog) of hydrothermal pretreatment.
The invention provides the apparatus and method that can realize the hydrothermal pretreatment of dewatered sludge effectively, relevant device operational reliability height, the efficiency of utilization height, and need not the flash distillation operation.Apparatus and method of the present invention have the following advantages:
1) for other hydrothermal pretreatment equipment and method, has higher energy utilization efficiency, can almost all reclaim the steam thermal energy that pressure leak process discharges;
2) by adding water earlier, add the measure of control of mud material again, can guarantee in the still that material evenly mixes fully and has lower viscosity, thereby in hydro-thermal reaction, can realize effective heat transfer;
3) need not the flash distillation operation and can realize effective hydrolysis effect, make the device operation more safe and reliable.
Description of drawings
Fig. 1 is according to the dewatered sludge hydrothermal pretreatment device of the specific embodiment of the present invention and operating process synoptic diagram thereof.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Illustrate as Fig. 1, the second hydro-thermal distilling kettle 200 that the inventive system comprises the first hydro-thermal distilling kettle 100 and be connected in parallel with it, wherein, the first hydro-thermal distilling kettle 100 is provided with first opening for feed 110, first destroyer 120, first steam inlet 130, first vapor-nozzle 140, first discharge port 150 and first vapor interface 160, and the second hydro-thermal distilling kettle 200 is provided with second opening for feed 210, second destroyer 220, second steam inlet 230, second vapor-nozzle 240, second discharge port 250 and second vapor interface 260; Wherein, described first destroyer 120 and described second destroyer 220 are equipped with the material of sending into is pulverized with described first opening for feed 110 and described second opening for feed 210 respectively.
The described first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 adopt over-over mode operation in parallel; At the described first hydro-thermal distilling kettle 100 and the described second hydro-thermal distilling kettle 200 comparatively speaking, introduced from the pressure release steam of the distilling kettle that is in the pressure release stage such as the second hydro-thermal distilling kettle 200, in order to dilution water or material 190 are carried out preheating such as the first hydro-thermal distilling kettle 100 by the distilling kettle that wherein is in step of reaction.Like this, the first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 in parallel by alternate run, just can be effectively used to the hydrothermal pretreatment process of dewatered sludge.
Because the first hydro-thermal distilling kettle 100 in operation and the second hydro-thermal distilling kettle 200 are alternate runs, " first " and " second " is the statement of relativity herein, and two distilling kettles are structurally normally identical; In addition, the first hydro-thermal distilling kettle 100 is structurally normally identical as the corresponding component of importing and exporting or be communicated with 200 each self-configuring of the second hydro-thermal distilling kettle, just its concrete purposes may be different in the cycle at specific run, such as, for certain cycle of operation, the import that first vapor interface 160 of the first hydro-thermal distilling kettle 100 is used as from the afterheat steam of the second hydro-thermal distilling kettle 200, second vapor interface 260 of the second hydro-thermal distilling kettle 200 then is used as the outlet of discharging the pressure release steam to the first hydro-thermal distilling kettle 100 in the same cycle of operation.
Preferably, described destroyer is set to be used with corresponding opening for feed, thereby to guarantee mud broken can mixing with water more equably effectively.For example, first destroyer 120 is arranged on the inside of first opening for feed 110, and second destroyer 220 is arranged on the inside of second opening for feed 210.In addition, preferably, first destroyer 120 and second destroyer 220 are the stirring-type destroyer.
Preferably, described first vapor-nozzle 104 and second vapor-nozzle 204 are set to have a plurality of nozzles separately.In an embodiment, is furnished with the conduit that is communicated with each nozzle.
Below, carry out exemplary description at the concrete processing method that adopts described device to carry out the hydrothermal pretreatment of dewatered sludge.As mentioned above, in general operation, two distilling kettles are alternate runs.For convenience, the first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 are in step of reaction and pressure release stage respectively in the cycle of operation described herein.
At first add water to the first hydro-thermal distilling kettle 100 from first opening for feed 110, wherein, according to the degree that the material hydrolysis is required, can add an amount of alkali for example NaOH to accelerate hydrolysis rate and to improve pretreating effect.After in the first hydro-thermal distilling kettle 100, adding a certain amount of dilution water earlier, treat that operating second distilling kettle 200 enters the pressure release stage, just will import from second vapor interface 260 by valve 270 from the pressure release steam of the second hydro-thermal distilling kettle 200, in order to the dilution water in the first hydro-thermal distilling kettle 100 is carried out preheating.
After the preheating of water in the first hydro-thermal distilling kettle 100 is finished, the material of dewatered sludge is added from first opening for feed 110 by for example pump, open first destroyer 120 simultaneously, high speed rotating by for example paddle makes material be divided into fritter, and falls into equably in the described dilution water of preheating.
After charging is finished, close first opening for feed 110, import the steam that comes from the boiler (not shown) by first steam inlet 130, utilize steam to spray into stirring and heat transfer that the interior power of still is realized material simultaneously.Preferably the material district in the first hydro-thermal distilling kettle 100 arranges first vapor-nozzle 140, make material heat temperature raising under the steam stirring action, when treating that temperature in the kettle and pressure reach about 0.5MPa～1.5MPa and about 130 ° of C～180 ° C respectively, keep about 15min～45min, so that the abundant hydrolysis of material and fully pulp, and then obviously improve dewatering and the anaerobic digestion performance of material.
In some cases, steam heat can't be absorbed by material rapidly, the top savings of the first hydro-thermal distilling kettle 100 has steam, send described vapor-nozzle 140 back to after can adopting the steam pressurized of air compressor machine with the first hydro-thermal distilling kettle, 100 tops, fully contact the raising heat transfer efficiency with what promote material and steam.
After the first hydro-thermal distilling kettle 100 is stated the end of step of reaction treating processes thereon, just enter the pressure release stage, and the second hydro-thermal distilling kettle 200 is in step of reaction.At this moment, Open valve 170 makes the pressure release steam in the first hydro-thermal distilling kettle 100 enter in the second hydro-thermal distilling kettle 200 that just adds dilution water by first vapor interface 160, valve 170 and second vapor interface 260, and dilution water is carried out preheating.
When treating that the first hydro-thermal distilling kettle, 100 internal pressures are recovered normal atmosphere, open first discharge port 150, will discharge from the first hydro-thermal distilling kettle 100 through the material of hydrothermal pretreatment, thereby finish a cycle of operation.
Preferably, the sludge crushing device by the opening for feed with the hydro-thermal distilling kettle is equipped with carries out effective fragmentation to material when charging, can reach more equably and mix with water.
As previously mentioned, the first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 can take the mode of alternate run to operate, and " first " and the terms such as " second " that are used for description hydro-thermal distilling kettle and parts thereof herein are the statements of relativity.In addition, operation is disposed according to described hydro-thermal distilling kettle can adopt different structures or form such as operational unit such as destroyer and vapor-nozzle and such as interconnecting pieces such as valves, to reach function or effect required for the present invention.
Above embodiment is to the further describing and illustrating of technical solution of the present invention, is not that the scope of the invention is limited.Therefore, the many various modifications that include but not limited to aspects such as structure, material, function, operating method and purposes or changes at content described herein do not break away from concept of the present invention and principle, and are appreciated that and belong to protection scope of the present invention.
Claims (13)
1. device that is used for the dewatered sludge hydrothermal pretreatment, it is characterized in that, described device comprises at least the first hydro-thermal distilling kettle and the second hydro-thermal distilling kettle that is connected with the described first hydro-thermal distilling kettle fluid, the wherein said first hydro-thermal distilling kettle is provided with first opening for feed, first destroyer, first steam inlet, first vapor-nozzle, first discharge port and first vapor interface, and the described second hydro-thermal distilling kettle is provided with second opening for feed, second destroyer, second steam inlet, second vapor-nozzle, second discharge port and second vapor interface; Wherein, described first destroyer and described second destroyer are equipped with being used for described first opening for feed and described second opening for feed respectively the material of sending into are pulverized.
2. device according to claim 1, wherein, described first vapor interface of the described first hydro-thermal distilling kettle forms fluid with described second vapor interface of the described second hydro-thermal distilling kettle and is communicated with, thereby the described first hydro-thermal distilling kettle and the described second hydro-thermal distilling kettle adopt over-over mode operation in parallel; At the described first hydro-thermal distilling kettle and the described second hydro-thermal distilling kettle, by the distilling kettle that wherein is in step of reaction introduce from the pressure release steam of the distilling kettle that is in the pressure release stage in order to dilution water or/and material carries out preheating.
3. device according to claim 1 and 2, wherein said first destroyer and described second destroyer are arranged at the inside of described first opening for feed and described first opening for feed respectively.
4. device according to claim 1 and 2, wherein said first destroyer and described second destroyer are beater.
5. device according to claim 1 and 2, wherein said first vapor-nozzle and described second vapor-nozzle are set to have a plurality of nozzles separately.
6. a utilization is carried out the method for dewatered sludge hydrothermal pretreatment as device as described in each of above-mentioned claim, it is characterized in that described method comprises:
Add dilution water to the described first hydro-thermal distilling kettle;
To the pressure release steam of described first hydro-thermal distilling kettle importing from the described second hydro-thermal distilling kettle, in order to the described dilution water in the described first hydro-thermal distilling kettle of preheating;
Add the material of dewatered sludge to the described first hydro-thermal distilling kettle, described material is entered in the described dilution water through preheating;
Import Boiler Steam to the described first hydro-thermal distilling kettle, and realize the stirring of described material and make described material heat temperature raising under the steam stirring action by described first vapor-nozzle;
Make the described material in the described first hydro-thermal distilling kettle reach and be in required temperature and pressure condition;
Make the hold-time that being reflected in the described first hydro-thermal distilling kettle kept under the described temperature and pressure condition to be needed, so that the abundant hydrolysis of described material and pulp fully;
Pressure release steam in the described first hydro-thermal distilling kettle is imported the described second hydro-thermal distilling kettle, in order to the dilution water in the described second hydro-thermal distilling kettle is carried out preheating; And will discharge from the described first hydro-thermal distilling kettle through the material of hydrothermal pretreatment.
7. method according to claim 6 wherein, is containing an amount of alkali in the described dilution water that adds to the described first hydro-thermal distilling kettle, in order to the hydrolysis rate of accelerating material and improve pretreating effect.
8. method according to claim 7, wherein said alkali is NaOH.
9. method according to claim 6, wherein, the described temperature of the described material in the described first hydro-thermal distilling kettle is about 130 ° of C～180 ° C.
10. method according to claim 6, wherein, the described pressure of the described material in the described first hydro-thermal distilling kettle is about 0.5MPa～1.5MPa.
11. method according to claim 6, wherein, the described hold-time of the described temperature and pressure of the described material in the described first hydro-thermal distilling kettle is about 15min～45min.
12. method according to claim 6, wherein, after importing described Boiler Steam to the described first hydro-thermal distilling kettle, savings steam is arranged at the top of the described first hydro-thermal distilling kettle if steam heat can't be absorbed by described material rapidly, then will send described vapor-nozzle back to after the described savings steam pressurized, to promote fully contacting and improving heat transfer efficiency of described material and steam.
13. method according to claim 6 when wherein adding described material to the described first hydro-thermal distilling kettle, also comprises described material is carried out fragmentation, so that described material can evenly mix and realize pre-pulp with the water through preheating.
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| CN 201210234194 CN102718376B (en) | 2012-06-21 | 2012-07-06 | Device and method for performing hydrothermal pretreatment on sludge |
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| CN201210208650 | 2012-06-21 | ||
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| CN 201210234194 CN102718376B (en) | 2012-06-21 | 2012-07-06 | Device and method for performing hydrothermal pretreatment on sludge |
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| CN102718376B true CN102718376B (en) | 2013-08-14 |
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| CN108911466A (en) * | 2018-07-27 | 2018-11-30 | 成都源永科技发展有限公司 | A kind of the high-efficiency dehydration processing system and method for industrial sludge hydro-thermal reaction |
| CN108840544B (en) * | 2018-07-27 | 2021-10-15 | 成都源永科技发展有限公司 | Industrial sludge recycling treatment method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3993527B2 (en) * | 2002-12-18 | 2007-10-17 | 大阪熱管理工業株式会社 | Evaporative drying equipment |
| CN201085029Y (en) * | 2007-09-14 | 2008-07-16 | 王春成 | Automatic control continuously boiling slurry tank |
| CN102417286A (en) * | 2011-12-16 | 2012-04-18 | 北京机电院高技术股份有限公司 | Steam pressure relief method and device for sludge hydrothermal drying steam pyrolysis reaction kettle |
| CN202643516U (en) * | 2012-06-21 | 2013-01-02 | 上海同济普兰德生物质能股份有限公司 | Device for sludge water heat pretreatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827700A (en) * | 1981-08-13 | 1983-02-18 | Ebara Infilco Co Ltd | Treatment of sewage sludge |
| NO330122B1 (en) * | 2009-07-13 | 2011-02-21 | Cambi As | Process and apparatus for thermal hydrolysis of biomass and steam explosion of biomass |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3993527B2 (en) * | 2002-12-18 | 2007-10-17 | 大阪熱管理工業株式会社 | Evaporative drying equipment |
| CN201085029Y (en) * | 2007-09-14 | 2008-07-16 | 王春成 | Automatic control continuously boiling slurry tank |
| CN102417286A (en) * | 2011-12-16 | 2012-04-18 | 北京机电院高技术股份有限公司 | Steam pressure relief method and device for sludge hydrothermal drying steam pyrolysis reaction kettle |
| CN202643516U (en) * | 2012-06-21 | 2013-01-02 | 上海同济普兰德生物质能股份有限公司 | Device for sludge water heat pretreatment |
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