CN104261648A - Activated sludge sterilizing and steam mechanical compression drying method and system - Google Patents
Activated sludge sterilizing and steam mechanical compression drying method and system Download PDFInfo
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- CN104261648A CN104261648A CN201410492062.9A CN201410492062A CN104261648A CN 104261648 A CN104261648 A CN 104261648A CN 201410492062 A CN201410492062 A CN 201410492062A CN 104261648 A CN104261648 A CN 104261648A
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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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- 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
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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Abstract
The invention discloses an activated sludge sterilizing and steam mechanical compression drying method and system. The method comprises the steps of (1) sterilizing water-containing activated sludge; (2) conveying the sterilized sludge to a rotary inner cylinder, sleeving a steam jacket at the outer side of the inner cylinder, emptying gases in the inner cylinder and the steam jacket, and introducing steam to the steam jacket through a compressor; and (3) circulating steam generated in the drying process between the inner cylinder and the steam jacket. The system comprises a sterilizing chamber, a screw pump and a rotary dryer, wherein a sludge outlet of the sterilizing chamber is butted with a feeding hole of the screw pump; and the rotary dryer comprises an outer cylinder, an inner cylinder, a compressor and a discharging pipe, wherein a sealed cavity located between the outer cylinder and the inner cylinder forms the steam jacket, and the feeding end of the inner cylinder is butted with a discharging hole of the screw pump. By using the activated sludge sterilizing and steam mechanical compression drying method and system, the sludge drying energy consumption is reduced, the water content of the dried sludge can be reasonably adjusted, and greenhouse gases discharged in the sludge drying process can be reduced.
Description
Technical field
The present invention relates to a kind of method and system for active sludge sterilizing and steam mechanical compression drying, belong to active sludge treatment technical field.
Background technology
Active sludge is the maximum a kind of mud of sewage treatment process generation, and along with going deep into of Development of China's Urbanization, sanitary wastewater, trade effluent generation constantly increase, and wastewater treatment becomes the requisite Infrastructure of urbanization process.As the most general waste water biochemical treatment method, the active sludge output that this method is brought presents makes us increasing fast uncannily, and therefore the final process of mud receives and pays close attention to widely.
It is generally acknowledged, to burn and landfill is the comparatively general method of factory's mud of disposing of sewage, but wherein unavoidable problem is, only with after the measure process such as mechanism filter-pressing, the water ratio of mud does not still reach the requirement of above two kinds of methods.The further dehydration of mud becomes the key of dealing with problems.
Tackle the generation of a large amount of active sludge, low cost fast drying process is the requirement of a certainty.Steam mechanical recompression technique is the novel method of dehydration, disclosed in Chinese patent literature CN102989181A, " Compound type monomer multi-effect steam mechanical recompression evaporator " and CN102989181A disclosed " a kind of mechanical vaporizer in compression of multiple-effect steam of monomer-type ", can reach the energy-conservation of evaporative process.CN1546386 disclosed " mechanically compress distillation sea water desalting device and method ", the process that the vapour compression providing a kind of multiple-effect evaporation is evaporated again.
It is worthy of note, vapour compression again evaporative process relates to steam by saturation steam, is converted to superheated vapour through adiabatic compression, more again becomes the process of saturation steam condensation through interchanger cooling.Can be seen by Fig. 1, the adiabatic compression curve of water saturation vapor-pressure curve and steam mechanical recompression, in figure, the steam adiabatic compression curve of different initial temperature is all far above saturated vapor pressure curve, i.e. Δ t > > Δ T, therefore its difference DELTA t-Δ T is the sensible heat change of mechanical energy switching process, reduces the utilising efficiency of mechanical energy.Although the temperature difference T of these process heat exchangers both sides must not or lack, the temperature curve of superheated vapour is far above the curve of saturation steam, under corresponding equal water vapor pressure conditions, the temperature difference T of evaporation and condensation is also little, and result will reflect the larger demand of heat interchanging area needed for this heat transfer process.Same, along with the increase of compression ratio (being vented the ratio with the pounds per square inch absolute (psia) of air inlet), superheated vapour and the saturation steam temperature difference more become to strengthening, and the utilising efficiency of mechanical energy declines to a great extent.
Find out equally by Fig. 2, adiabatic compression temperature out increases with the increase of compression ratio, the mechanical energy theory caused consumes and increases sharply, particularly initial temperature is different, and the mechanical energy consumption that same compression ratio is corresponding with the adiabatic compression temperature difference is different, and initial temperature is higher, mechanical energy consumption is less, and it is different to produce compression ratio corresponding to same saturation steam temperature difference T, initial temperature is higher, and required compression ratio is less.
Can find out based on above analysis, the water vapor after adiabatic compression has suitable Δ T, can be used for the evaporative process of the liquid water of some system, naturally also can be used for the drying process that water treatment produces mud.CN103708702A disclosed " a kind of vapour compression reclaims the energy-saving sludge drying installation of waste heat ", be then make use of exhaust steam that other system produces after boosting, heating dry air is used further to the dehumidification system of rotary kiln mud.The water vapour that CN103708697A disclosed " function of mechanical steam recompression heat pump MVR sludge drying system " and CN203212442U disclosed " a kind of function of mechanical steam recompression heat pump for sludge drying " then directly utilizes drying process to produce, after compressor adiabatic compression heats up, be directly used in the drying sludge of system, the object that drying sludge is energy-conservation can be reached.But this technology and not to be noted initial temperature on the consumable impact of system mechanics, although system adds auxiliary electrical heating function.Why not yet this is the one of the main reasons of above patent documentation large-scale application.Say on the whole, because the temperature head of mud turnover dehumidification system all derives from electric energy, its actual running cost is still difficult to compared with steam, heated dry air drying process.Prior, the mud of major part sewage treatment process contains a large amount of active sludge, active sludge is in dry temperature-rise period, promptly can produce the biogas under anaerobic state or the carbonic acid gas under aerobic state, these gases are incoagulability greenhouse gases, in the working cycle of steam mechanical compression system, the working cycle of system will be had a strong impact on.Because incoagulability greenhouse gases constantly accumulate, discharge without the latent heat of vaporization in compression refrigeration cycle process, dehumidification system can be caused normally to work, all not to be noted associated problem in existing Patents document.
Summary of the invention
The present invention is directed to the deficiency that existing active sludge steam mechanical compression drying technology exists, a kind of cost is low, drying effect is good active sludge sterilizing and steam mechanical compression drying method are provided, a kind of system realizing the method is provided simultaneously.
Active sludge sterilizing of the present invention and steam mechanical compression drying method, concrete steps are as follows:
(1) moisture active sludge is introduced into sterilising chamber, by circulating air, mud is heated to 80-100 DEG C, sterilization, prevents the microorganism in follow-up drying process mud from producing incoagulability greenhouse gases;
(2) mud after sterilizing is delivered to one and rotates inner core, is set with a urceolus, forms steam jacket between inner core and urceolus outside this inner core; Before operation, should air in first emptying inner core and steam jacket and other non-condensable gases, ensure that inner core temperature is 60-100 DEG C by passing into steam to steam jacket, and inner core is rotated;
(3) water vapor that in inner core, drying sludge process produces forms circulation by compressor between inner core and steam jacket, the compression ratio of compressor regulates according to the internal-external temperature difference of inner core, the compression ratio of compressor controls at 1.5-2.1, to ensure that the Energy Efficiency Ratio of vapour compression recirculation system is greater than 10;
(4) water ratio meets the requirements of mud and is drawn off by the afterbody of inner core.
Realize active sludge sterilizing and the steam mechanical compression drying system of aforesaid method, by the following technical solutions:
This system, comprises sterilising chamber, spiral pump and rotary dryer; The top of sterilising chamber is provided with mud import, bottom is provided with sludge outlet, the top of sterilising chamber is provided with venting port, this venting port is connected with deodorizing device, the outside of sterilising chamber is provided with the circulating line connecting sterilising chamber's top and bottom, circulating line is provided with recycle pump and vapor heat exchanger, and the sludge outlet bottom sterilising chamber docks with the opening for feed of spiral pump; Rotary dryer comprises urceolus, inner core, compressor and discharge tube, inner core is sleeved in urceolus, feed end and the discharge end of inner core all stretch out urceolus, closed cavity between urceolus and inner core forms steam jacket, the inside of inner core is connected with the entrance of compressor by steam-pipe, the outlet of compressor is connected with urceolus, the feed end of inner core docks with the discharge port of spiral pump, discharge end docks with discharge tube, the top of urceolus is provided with evacuated tube, evacuated tube is provided with exhaust-valve, and the bottom of urceolus is provided with condensation drain pipe.
Spiral pump is provided with sleeve, forms gap between sleeve and spiral pump, steam-pipe is connected on this sleeve and is also communicated with the gap between sleeve with spiral pump, and the feed end of inner core is sleeved on sleeve.The steam that in inner core, drying sludge evaporation produces enters steam-pipe by the gap between sleeve and spiral pump, is pressed into steam jacket by compressor.Be provided with tightness system (sealing-ring) between the feed end of inner core and sleeve, enter inner core to prevent extraneous air.
The feed end of inner core and be provided with tightness system (sealing-ring) between discharge end and urceolus, enters inner core and steam jacket to prevent extraneous air.
Discharge tube is provided with twice discharge valve.
Inner core is connected with transmission rig, realizes the rotation of inner core, to ensure the even of drying sludge process.
The present invention is first sterilizing before active sludge drying, prevent from drying process, producing incoagulability greenhouse gases, the water vapor that conservative control drying process produces simultaneously passes in and out the compression ratio of compressor, ensure that the efficiency of vapour compression recirculation system, accelerate drying sludge process, improve drying effect.
Accompanying drawing explanation
Fig. 1 is water vapor pounds per square inch absolute (psia) and steam temperature graph of a relation.
Fig. 2 is the graph of a relation of adiabatic compression temperature out and mechanical energy consumption theoretical value.
Fig. 3 is the structural representation of active sludge sterilizing of the present invention and steam mechanical compression drying system.
In figure: 1, sterilising chamber, 2, deodorizing device, 3, recycle pump, 4, spiral pump, 5, urceolus, 6, inner core, 7, compressor, 8, steam-pipe, 9, evacuated tube, 10, discharge tube, 11, discharge valve, 12, condensation drain pipe, 13, vapor heat exchanger, 14, sleeve pipe.
Embodiment
As shown in Figure 3, active sludge sterilizing of the present invention and steam mechanical compression drying system, comprise sterilising chamber 1, spiral pump 4 and rotary dryer, the sludge outlet of sterilising chamber 1 docks with the opening for feed of spiral pump 4, the discharge end of spiral pump 4 docks with the feed end of the inner core 6 of rotary dryer, joint is provided with tightness system (sealing-ring), enters inner core to prevent extraneous air.
The top of sterilising chamber 1 is provided with mud import, and bottom is provided with sludge outlet, and the top of sterilising chamber 1 is provided with venting port, and this venting port is connected with deodorizing device 2.The outside of sterilising chamber 1 is provided with the circulating line connecting sterilising chamber 1 top and bottom, circulating line is provided with recycle pump 3, vapor heat exchanger 13 is set in circulating line 3, air in circulating line 3 is heated by vapor heat exchanger 13, form hot blast, hot blast is to the water-containing sludge heat sterilization entered in sterilising chamber 1.Sludge outlet bottom sterilising chamber 1 docks with the opening for feed of spiral pump 4.
Rotary dryer comprises urceolus 5, inner core 6, compressor 7 and discharge tube 10, inner core 6 is sleeved in urceolus 5, the feed end of inner core 6 and discharge end all stretch out urceolus 5, and the feed end of inner core 6 and be provided with sealing-ring between discharge end and urceolus 5, enter to prevent extraneous air.Closed cavity between urceolus 5 and inner core 6 forms steam jacket.In order to be drawn by the water vapor of inner core 6, the outlet pipe of spiral pump 4 is provided with sleeve pipe 14, and sleeve pipe 14 is fixedly connected on spiral pump 4 by modes such as welding.Gap is formed between the outlet pipe of sleeve 14 and spiral pump 1, sleeve 14 outer wall is connected with the steam-pipe 8 be communicated with this gap, the feed end of inner core 6 is sleeved on sleeve 14, be provided with tightness system (sealing-ring) between the feed end of inner core and sleeve, enter inner core 6 to prevent extraneous air.The other end of steam-pipe 8 is connected with the entrance of compressor 7, and the outlet of compressor 7 is connected with urceolus 5.Complete the sewage sludge feed to inner core 6 by spiral pump 1 like this, the water vapor that in inner core 6, the evaporation of drying sludge process produces enters steam-pipe 8 by the gap between sleeve 14 and spiral pump 1, then enters steam jacket by the operation of compressor 7 and recycle.So neither affect spiral pump 4 to inner core 6 convey materials, also do not affect the rotation of inner core 6.The discharge end of inner core 6 docks with discharge tube 10.Exhaust end 10 is provided with twice discharge valve 11.The top of urceolus 5 is provided with evacuated tube 9, and evacuated tube 9 is provided with exhaust-valve, and the bottom of urceolus 5 is provided with condensation drain pipe 12.
Inner core 6 can be connected with transmission rig, realizes the rotation of inner core 6, to ensure the even of drying sludge process.
The process of said system to water-containing sludge drying is as described below:
(1) the moisture sludge sewage of about 80% is introduced into sterilising chamber 1, by steam heating circulating air, circulating air forms circulation by recycle pump 3 in sterilising chamber 1, mud is heated to 80-100 DEG C, sterilization, prevents the microorganism in follow-up drying process mud from producing incoagulability greenhouse gases.
Compared with warm air drying, this sterilization unit can use circulating air with save energy, and need not pay close attention to the size of atmospheric moisture, and partial discharge hot blast enters deodorizing device 2 to remove stink, prevents peculiar smell discharging from polluting.
(2) mud after sterilizing clamp-ons the inner core 6 of rotary dryer through spiral pump 4, and inner core 6 rotates, to ensure the even of drying sludge process.By to injecting steam in steam jacket, the temperature in inner core 6 is made to reach 60-100 DEG C, to drying sludge.Before system cloud gray model, first should open the air in the steam jacket between the emptying rotary dryer urceolus 5 of exhaust-valve in evacuated tube 9 and inner core 6 and other non-condensable gases, also want the air in emptying inner core 6 and other non-condensable gases simultaneously.
(3) water vapor that produces of inner core 6 drying sludge process to be circulated press-in urceolus 5 by compressor 7 through pipeline 8, and the compression ratio of compressor 7 is adjustable, and determines according to the internal-external temperature difference of rotary dryer inner core 6.The water of condensation that urceolus 6 produces is discharged by condensation drain pipe 12.The compression ratio of compressor controls at 1.5-2.1, can ensure that the Energy Efficiency Ratio of vapour compression recirculation system is greater than 10.
Compressor 7 can adopt the forms such as centrifugal, screw, and compression ratio can regulate according to the variable-frequence governor of motor, can spray into the water of condensation that urceolus 6 is discharged in the spiral case of compressor 7, to reduce the thermal insulation warming of compression process, reduces power consumption.
(4) water ratio meets the requirements of mud and enters discharge tube 10 by the discharge end of inner core 6.For preventing inner core 6 from leaking gas, when drawing off dried mud, by alternately opening the twice discharge valve 11 on discharge tube 10, first opening one discharge valve and sludge-drying is entered between twice discharge valve, then one discharge valve is closed in pass, opens down one discharge valve.Also by the quantitative discharging of spiral discharging machine.
Claims (7)
1. active sludge sterilizing and a steam mechanical compression drying method, is characterized in that, comprise the following steps:
(1) moisture active sludge is introduced into sterilising chamber, by circulating air, mud is heated to 80-100 DEG C, sterilization, prevents the microorganism in follow-up drying process mud from producing incoagulability greenhouse gases;
(2) mud after sterilizing is delivered to one and rotates inner core, is set with a urceolus, forms steam jacket between inner core and urceolus outside this inner core; Before operation, should air in first emptying inner core and steam jacket and other non-condensable gases, pass into steam by compressor to steam jacket and ensure that inner core temperature is 60-100 DEG C, and inner core is rotated;
(3) water vapor that in inner core, drying sludge process produces forms circulation by compressor between inner core and steam jacket, the compression ratio of compressor regulates according to the internal-external temperature difference of inner core, the compression ratio of compressor controls at 1.5-2.1, to ensure that the Energy Efficiency Ratio of vapour compression recirculation system is greater than 10;
(4) water ratio meets the requirements of mud and is drawn off by the afterbody of inner core.
2. active sludge sterilizing and a steam mechanical compression drying system, comprise sterilising chamber, spiral pump and rotary dryer; It is characterized in that: the top of sterilising chamber is provided with mud import, bottom is provided with sludge outlet, the top of sterilising chamber is provided with venting port, this venting port is connected with deodorizing device, the outside of sterilising chamber is provided with the circulating line connecting sterilising chamber's top and bottom, circulating line is provided with recycle pump and vapor heat exchanger, and the sludge outlet bottom sterilising chamber docks with the opening for feed of spiral pump; Rotary dryer comprises urceolus, inner core, compressor and discharge tube, inner core is sleeved in urceolus, feed end and the discharge end of inner core all stretch out urceolus, closed cavity between urceolus and inner core forms steam jacket, the inside of inner core is connected with the entrance of compressor by pipeline, the outlet of compressor is connected with urceolus, the feed end of inner core docks with the discharge port of spiral pump, discharge end docks with discharge tube, the top of urceolus is provided with evacuated tube, evacuated tube is provided with exhaust-valve, and the bottom of urceolus is provided with condensation drain pipe.
3. active sludge sterilizing according to claim 2 and steam mechanical compression drying system, it is characterized in that: described spiral pump is provided with sleeve, gap is formed between sleeve and spiral pump, steam-pipe is connected on this sleeve and is also communicated with the gap between sleeve with spiral pump, and the feed end of inner core is sleeved on sleeve.
4. active sludge sterilizing according to claim 3 and steam mechanical compression drying system, is characterized in that: be provided with tightness system between the feed end of described inner core and sleeve.
5. active sludge sterilizing according to claim 2 and steam mechanical compression drying system, is characterized in that: the feed end of described inner core and be provided with tightness system between discharge end and urceolus.
6. active sludge sterilizing according to claim 2 and steam mechanical compression drying system, is characterized in that: described discharge tube is provided with twice discharge valve.
7. active sludge sterilizing according to claim 2 and steam mechanical compression drying system, is characterized in that: described inner core is connected with transmission rig.
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| CN201410492062.9A CN104261648B (en) | 2014-09-23 | 2014-09-23 | A kind of active sludge sterilizing and steam mechanical compression drying method and system |
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| CN201410492062.9A CN104261648B (en) | 2014-09-23 | 2014-09-23 | A kind of active sludge sterilizing and steam mechanical compression drying method and system |
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| CN104261648B CN104261648B (en) | 2016-01-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107804955A (en) * | 2017-11-15 | 2018-03-16 | 苏州欧拉透平机械有限公司 | Energy-saving sludge drying process system |
| CN109401760A (en) * | 2018-11-21 | 2019-03-01 | 中节能博实(湖北)环境工程技术股份有限公司 | Indirect propelling sewage sludge high temperature carbonization furnace |
| CN110272758A (en) * | 2019-07-29 | 2019-09-24 | 裴来根 | Steam-type de-watering apparatus |
| CN111892264A (en) * | 2020-08-24 | 2020-11-06 | 武汉永清环保科技工程有限公司 | Sludge co-combustion treatment device and treatment method without secondary exposure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774742A (en) * | 2009-11-04 | 2010-07-14 | 郭少仪 | Air sucking and pressing type high-efficiency energy-saving instant quick low-temperature sludge drying, disinfecting and fresh keeping method and device |
| CN103848550A (en) * | 2012-12-03 | 2014-06-11 | 上海理工大学 | Sludge drying and burning device with low NOx discharge and drying and burning method |
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2014
- 2014-09-23 CN CN201410492062.9A patent/CN104261648B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774742A (en) * | 2009-11-04 | 2010-07-14 | 郭少仪 | Air sucking and pressing type high-efficiency energy-saving instant quick low-temperature sludge drying, disinfecting and fresh keeping method and device |
| CN103848550A (en) * | 2012-12-03 | 2014-06-11 | 上海理工大学 | Sludge drying and burning device with low NOx discharge and drying and burning method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107804955A (en) * | 2017-11-15 | 2018-03-16 | 苏州欧拉透平机械有限公司 | Energy-saving sludge drying process system |
| CN109401760A (en) * | 2018-11-21 | 2019-03-01 | 中节能博实(湖北)环境工程技术股份有限公司 | Indirect propelling sewage sludge high temperature carbonization furnace |
| CN110272758A (en) * | 2019-07-29 | 2019-09-24 | 裴来根 | Steam-type de-watering apparatus |
| CN111892264A (en) * | 2020-08-24 | 2020-11-06 | 武汉永清环保科技工程有限公司 | Sludge co-combustion treatment device and treatment method without secondary exposure |
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| CN104261648B (en) | 2016-01-20 |
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Effective date of registration: 20181109 Address after: 250010 Ji'nan high tech Zone, Shandong, 22 floor, building A3-5, Jingyu, Han Yu, 7000 East ten road. Patentee after: Qingdao Dong Zheng Environmental Protection Technology Co., Ltd. Address before: No. 27, mountain Dana Road, Ji'nan City, Shandong, Shandong Patentee before: Shandong University |