CN101817630B - Pulse flashing deep dehydration method and device for sludge - Google Patents
Pulse flashing deep dehydration method and device for sludge Download PDFInfo
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- CN101817630B CN101817630B CN2010101399491A CN201010139949A CN101817630B CN 101817630 B CN101817630 B CN 101817630B CN 2010101399491 A CN2010101399491 A CN 2010101399491A CN 201010139949 A CN201010139949 A CN 201010139949A CN 101817630 B CN101817630 B CN 101817630B
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Abstract
The invention discloses a pulse flashing deep dehydration method for sludge, which comprises the following steps: preparing wet sludge into slurry containing 85%-90% of water; delivering the slurry into a flashing steam high-temperature preheater for heating; when a pulse valve arranged at the outlet of a refining kettle is closed, elevating the temperature and pressure in the refining kettle to certain values by utilizing a high pressure pump; then opening the pulse valve so that the slurry in the refining kettle rapidly expands, part slurry enters a flashing kettle and generates a flashing steam explosion effect, thus damaging the sludge structure and generating flashing steam; then, closing the pulse valve again; cycling continuously to generate the structure damaged sludge and flashing steam; introducing the flashing steam into the flashing steam high-temperature preheater for heating the slurry; and after the sludge enters a cooling kettle and is cooled, carrying out sludge water separation by utilizing a separator to obtain a sludge cake containing less than 35% of water. The device disclosed by the invention comprises a preparing kettle (1), the high pressure pump (2), the flashing steam high-temperature preheater (7), the refining kettle (6), the pulse valve (5), the flashing kettle (4), the cooling kettle (8) and the separator (9). The invention has low energy consumption and continuous operation, and the sludge treated at high temperature truly meets the requirements of stabilization, harmlessness and reduction.
Description
Technical field
The present invention relates to a kind of deep dehydration method for sludge and device, relate in particular to a kind of employing pulse flashing technology, make mud continue to produce flash distillation, the quick-fried effect of vapour, improve the method and the device of dewatering performance of sludge.
Technical background
Be accompanied by fast development and the people of the global economy growing interest to environment, the amount of sewage disposal increases at a high speed, has caused the rapid expansion of sludge yield.At present, China's annual discharging dewatered sludge is about 5,000,000 tons, and in continuous increase.Improper meeting causes serious secondary pollution like Treatment of Sludge, and the investment of Treatment of Sludge and operating cost are huge, accounts for 25%～65% of investment of entire sewage factory and operating cost, has become the heavy burden that the municipal sewage plant faces.Therefore, how economical, efficiently dispose excess sludge, realize that sludge stabilizing, innoxious, resource are the current important topics that solve be badly in need of.
Contain a large amount of microbial cells and organic matter colloid in the mud, caused the sludge dewatering difficulty, the dehydrated sludge cake moisture content is up to about 80% usually.The means of sludge treatment mainly comprise compost, landfill and burning, and three methods of disposal all need further to reduce the moisture content of mud, generally require below 50%, and this adopts the mummification mode usually.But sludge drying need consume a large amount of energy, and as adopting the steam mummification, one ton of mud need consume the steam of 0.8-1 ton, and operating cost is high.
Sludge high temperature heat is modified, through steam mud is heated to 130-200 ℃, ties up temperature a period of time, can change the dewatering of mud; Flash distillation (vapour is quick-fried) preliminary treatment is a kind of rapidly preprocess method of development in recent years, through unexpected release of pressure, under the effect of mechanical force, destroys material structure.It is modified that the present invention is used for sludge at low temperature with the pulse flashing technology; Through the switching of pulse valve and often opening of high-pressure pump; Constantly change the pressure of modified still, make the mud in the modified still continue to produce flash distillation, the quick-fried effect of vapour, improved the dewatering of mud; Reduced the moisture content of mud cake, to adapt to the recycling sludge utilization.
The used thermal source of the present invention is steam or conduction oil; It only needs that mud is starched physics and is warmed up to 130-200 ℃; Water does not wherein produce vaporization; Consumed energy significantly reduces, and is merely 1/3rd to 1/4th of mummification, and really reaches the requirement of stabilisation, innoxious, minimizing through the mud of high-temperature process.
Summary of the invention
The present invention provides the mud pulse flashing deep dehydration method and the device of a kind of economy, energy-saving and environmental protection, and the modified technology of mud heat is combined with flash evaporation technology, utilizes pulse technique, realization deeply dehydrating sludge that can work continuously, low energy consumption.
The present invention adopts following technical scheme:
A kind of mud pulse flashing deep dehydration method, step is following:
Another technical scheme of the present invention is a kind of device of implementing above-mentioned mud pulse flashing deep dehydration method; Comprise preparation still, high-pressure pump, flash steam high-temperature preheater, modified still, pulse valve, flash distillation still, cooling reactor, separator; The outlet of preparation still is connected with the high-pressure pump import; High-pressure pump exports and links to each other with flash steam high-temperature preheater cold side inlet; Flash steam high-temperature preheater cold side outlet links to each other with modified still import, and modified still outlet is connected with the import of flash distillation still through pulse valve, and the hot side inlet with the flash steam high-temperature preheater suitable for reading of flash distillation still links to each other, the end opening of flash distillation still links to each other with the hot side inlet of mud low-temperature pre-heater; The hot junction outlet of said mud low-temperature pre-heater and the hot junction outlet of flash steam high-temperature preheater are connected with the import of cooling reactor, and the outlet of cooling reactor links to each other with separator.
The course of work of the present invention is following:
Moisture about 80% dewatered sludge is with the dried up mud that is mixed with moisture 85%-90% of branch, through high-pressure pump; Be forced into below the 2MPa, send into the flash steam high-temperature preheater and be heated to more than 100 ℃, get into modified still again and be heated to 130 ℃～160 ℃; When pulse valve was opened, mud sharply expanded in the modified still, and part mud gets into the flash distillation still and produces the quick-fried effect of flash steam; Mud-water separation is carried out through separator in cooling reactor cooling back, obtains moisture less than 35% sludge cake.
Compared with prior art, the present invention has the following advantages:
1, the present invention adopts pulse valve, realizes the modified process serialization of mud.
2, the present invention constantly changes the pressure of modified still through the switching of pulse valve and often opening of high-pressure pump, and the mud in the modified still is repeatedly sharply expanded, and gets into the flash distillation still and produces flash distillation, the quick-fried effect of vapour.It has realized that not only the high temperature of mud is modified; Also utilize the quick-fried characteristics of flash steam; Greatly destroy the mud structure, the use of pulse valve is repeatedly sharply expanded the mud in the modified still, further improves dewatering performance of sludge; Moisture content of the cake can reach below 35% behind the deep dehydration, has realized its recycling fully.
3, the present invention adopts the pulse flashing device, can reduce mud refining temperature, pressure, and its minimum lower limit is respectively 130 ℃, 1.2MPa, and the heat of the flash steam after the flash distillation, warm sludge slurry, thermal release water further reclaims, and has reduced energy consumption.
4, the present invention adopts hot modified technology, really reaches the requirement of stabilisation, innoxious, minimizing through the mud of high-temperature process.
Description of drawings
Fig. 1 is a mud pulse flashing deep dehydration device sketch map of the present invention.
Have among the above figure: 1, preparation still 2, high-pressure pump 3, mud low-temperature pre-heater 4, flash distillation still 5, pulse valve 6, modified still 7, flash steam high-temperature preheater 8, cooling reactor 9, separator.
The specific embodiment
A kind of mud pulse flashing deep dehydration method, step is following:
In the present embodiment, the heating-up temperature of said mud in modified still is 130 ℃, 142 ℃, 150 ℃ or 160 ℃, and the pressure in the modified still is 1.2MPa, 1.5MPa, 1.6MPa or 2.5MPa,
In the present embodiment, consider further raising utilization efficiency of heat energy, cut down the consumption of energy, before the mud that step 3 is produced is sent into the cooling reactor cooling, earlier said mud is sent into the mud low-temperature pre-heater, be used for the heating of mud.
A kind of device of implementing above-mentioned mud pulse flashing deep dehydration method; Comprise preparation still 1, high-pressure pump 2, flash steam high-temperature preheater 7, modified still 6, pulse valve 5, flash distillation still 4, cooling reactor 8, separator 9; Preparation still outlet 1 is connected with high-pressure pump 2 imports; High-pressure pump 2 exports and links to each other with flash steam high-temperature preheater 7 cold side inlets; Flash steam high-temperature preheater 7 cold side outlets link to each other with modified still 6 imports, and modified still 6 outlets are connected with 4 imports of flash distillation still through pulse valve 5, and the hot side inlet with flash steam high-temperature preheater 7 suitable for reading of flash distillation still 4 links to each other, the end opening of flash distillation still 4 links to each other with the hot side inlet of mud low-temperature pre-heater 3; The hot junction outlet of said mud low-temperature pre-heater 3 and the hot junction outlet of flash steam high-temperature preheater 7 are connected with the import of cooling reactor 8, and the outlet of cooling reactor 8 links to each other with separator 9.
In the present embodiment, between high-pressure pump 2 and flash steam high-temperature preheater 7, be provided with mud low-temperature pre-heater 3, and the outlet of said high-pressure pump 2 is connected with flash steam high-temperature preheater 7 cold side inlets through mud low-temperature pre-heater 3.
In the present embodiment, on modified still 6, compressed air inlet is set, bubbling air (or oxygen) is to improve modified effect; Simultaneously, the incoagulable gas floss hole is set, to improve the heat exchange effect of flash steam high-temperature preheater 7 on flash distillation still 4 tops.
Claims (1)
1. mud pulse flashing deep dehydration method is characterized in that step is following:
Step 1 mud that will wet is mixed with moisture 85%～90% mud, and through high-pressure pump, mud is sent into the flash steam high-temperature preheater heat,
Step 2 is got a modified still, in the outlet of modified still pulse valve is set,
Step 3 makes pulse valve be in closed condition, simultaneously, will pass through mud after the flash steam high-temperature preheater heating by high-pressure pump and send into modified still and be heated to 130 ℃～160 ℃; Pressure in modified still reaches 1.2MPa～2.5MPa; Open pulse valve again, mud sharply expands in the modified still, and part mud gets into the flash distillation still and produces the quick-fried effect of flash steam; Destroy the mud structure, produce flash steam; After this, close pulse valve once more, by high-pressure pump the new mud through after the heating of flash steam high-temperature preheater is sent into modified still and be heated to 130 ℃～160 ℃; Pressure in modified still reaches 1.2MPa～2.5MPa once more; Open pulse valve again, mud sharply expands in the modified still, and part mud gets into the flash distillation still and produces the quick-fried effect of flash steam; Destroy the mud structure, produce flash steam; Through continuous open and close pulse valve like this, the interior mud of modified still is repeatedly expanded, produce destructurized mud and flash steam,
Step 4 feeds the flash steam high-temperature preheater with the flash steam that step 3 produces, and is used for the heating of mud, and the mud that step 3 is produced is sent into cooling reactor cooling back and carried out mud-water separation through separator, obtain moisture less than 35% sludge cake,
Implement the device of said mud pulse flashing deep dehydration method; Comprise preparation still (1), high-pressure pump (2), flash steam high-temperature preheater (7), modified still (6), pulse valve (5), flash distillation still (4), cooling reactor (8), separator (9); Preparation still (1) outlet is connected with high-pressure pump (2) import; High-pressure pump (2) outlet links to each other with flash steam high-temperature preheater (7) cold side inlet; Flash steam high-temperature preheater (7) cold side outlet links to each other with modified still (6) import; Modified still (6) outlet is connected with flash distillation still (4) import through pulse valve (5); The hot side inlet with flash steam high-temperature preheater (7) suitable for reading of flash distillation still (4) links to each other, the end opening of flash distillation still (4) links to each other with the hot side inlet of mud low-temperature pre-heater (3), and the hot junction outlet of said mud low-temperature pre-heater (3) and the hot junction outlet of flash steam high-temperature preheater (7) are connected with the import of cooling reactor (8), and the outlet of cooling reactor (8) links to each other with separator (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101399491A CN101817630B (en) | 2010-04-02 | 2010-04-02 | Pulse flashing deep dehydration method and device for sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101399491A CN101817630B (en) | 2010-04-02 | 2010-04-02 | Pulse flashing deep dehydration method and device for sludge |
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| CN101817630A CN101817630A (en) | 2010-09-01 |
| CN101817630B true CN101817630B (en) | 2012-04-18 |
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| CN2010101399491A Expired - Fee Related CN101817630B (en) | 2010-04-02 | 2010-04-02 | Pulse flashing deep dehydration method and device for sludge |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102838264B (en) * | 2012-02-27 | 2014-06-25 | 四川深蓝环保科技股份有限公司 | Process and apparatus for treating biomass |
| CN103304118A (en) * | 2012-03-15 | 2013-09-18 | 李铀 | High-pressure digestion and blasting dehydration process of sludge |
| CN107540191A (en) * | 2017-10-10 | 2018-01-05 | 杨继新 | Sludge environment-friendly processing unit |
| CN108328901A (en) * | 2018-03-29 | 2018-07-27 | 天津大学 | A kind of sludge drying mechanism integrated based on waste heat |
| CN109694173A (en) * | 2019-02-15 | 2019-04-30 | 清正生态科技(苏州)有限公司 | Sludge heavy-metal steam explosion removes system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| HU204738B (en) * | 1989-09-05 | 1992-02-28 | Richter Gedeon Vegyeszet | Process and equipment for recovering fat- or protein-containing solid material from fat-containing sludge and/or sewage, particularly from slaughtered sludge and/or sewage |
| CN101012095A (en) * | 2007-01-29 | 2007-08-08 | 清华大学 | Low consumption highly effective sludge drying method |
| CN101290121B (en) * | 2007-04-18 | 2011-02-09 | 深圳市环源科技发展有限公司 | Wet sludge anhydration burning processing system and process |
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