CN100445224C - Sludge drying and granulating system by using residual heat of exhaust flue gas in garbage power - Google Patents

Sludge drying and granulating system by using residual heat of exhaust flue gas in garbage power Download PDF

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Publication number
CN100445224C
CN100445224C CNB2006100523620A CN200610052362A CN100445224C CN 100445224 C CN100445224 C CN 100445224C CN B2006100523620 A CNB2006100523620 A CN B2006100523620A CN 200610052362 A CN200610052362 A CN 200610052362A CN 100445224 C CN100445224 C CN 100445224C
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China
Prior art keywords
sludge
drying kiln
mud
joins
revolution drying
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CNB2006100523620A
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CN1884160A (en
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翁焕新
苏闽华
陈海燕
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The present invention relates to a sludge drying and granulating system using the residual heat of smoke gas discharged in garbage power generation, which comprises a sludge pretreatment subsystem, a feeding subsystem, a heat supply subsystem, a sludge drying and granulating subsystem and a dust removing subsystem. In the present invention, sludge is dried through the residual heat of smoke gas discharged in garbage power generation; consequently, the production cost is reduced, and the discharge of hot gas towards the atmosphere is reduced. In the present invention, sludge is dried through the residual heat of smoke gas discharged in garbage power generation; consequently, under the condition of no need for the consumption of new energy resource, the water ratio of sludge of a sewage treatment plant is reduced, the heat energy resources of the sludge are utilized to the greatest extent, and urban sludge is actually treated in the harmless, amount reducing and resource mode.

Description

Utilize the sludge drying and the granulating apparatus of residual heat of exhaust flue gas in garbage power
Technical field
The present invention relates to a kind of sludge drying and granulating system that utilizes residual heat of exhaust flue gas in garbage power.
Background technology
City domestic sewage and trade effluent are through the processing of sewage work, and back up to standard discharging is protection water resources and the requisite environmental engineering measure of Urban Ecology Environment Construction.Urban sewage treatment system comprises sewage disposal and sludge treatment two portions.In recent years, by introducing advanced foreign technology and technological transformation, the water technology level of China is greatly improved, and various types of sewage can both be effectively controlled.Yet the sludge treatment technology to producing in the sewage treatment process lags behind the development of urban sewage treatment technology out and away.All kinds of sewage are through handling, and most pollutents are transferred in the mud, therefore, sludge from wastewater treatment plant except having the characteristics that water ratio is high and quantity is big, and also enrichment the hazardous contaminant of a large amount of high densitys.
Owing to do not have effective sludge treatment technology to use for reference abroad, therefore, China mainly takes the interim method of disposal of burying of piling for sludge from wastewater treatment plant at present, not only spend a large amount of funds and take a large amount of land resources, and cause serious secondary pollution to ecotope, particularly ooze under the sewage in the mud, be unable to estimate especially to the harm that groundwater resource bring.And in fact peri-urban can not have space and the place that is fit to stack this class mud, and the interim heap of mud buries the harm of the secondary environmental pollution that is produced, and has in fact offset the environmental benefit of sewage disposal.In the face of the reality that environmental problem is sharp-pointed day by day and mud harm increasingly sharpens that mud causes, people attempt utilizing the mud as fertilizer sources, are used for agricultural or greening, and still, each contained heavy metal species has limited the adaptability that soil utilizes mud in the mud.Their meeting enrichments in soil, and enter food chain by the absorption of crop, finally jeopardize the health of human body, even some mud is from city domestic sewage, though heavy metal content is lower, but contained pathogenic agent and persistence organic pollutant in the mud, and the various medicaments that add in the sewage treatment process all can bring potential harm to environment.
Some places attempt to reach by burning the purpose of mud decrement.But, sludge incineration facility investment volume height, energy-output ratio is big, working cost costliness, the expense of sludge incineration add that more than 400 yuan/ton mud is when burning, can to atmospheric environment bring pollute and burn after residue reason such as still need dispose, according to the national conditions of China, sludge incineration is handled and is difficult to economically bear, and goes back imperfection technically.
Along with increasing rapidly of China's rapid economy development and urban population, the municipal sewage treatment amount this means that the quantity of sludge of sewage treatment plant will grow with each passing day, therefore constantly increasing, open up that municipal sludge is innoxious, the effective way of minimizing and recycling treatment, imperative.According to us to studies show that of sludge from wastewater treatment plant physico-chemical property, the main chemical compositions content in the mud little (table 1), this has illustrated the mud that the municipal sewage plant produces, its main chemical constitution is a kept stable.
The chemical constitution (%) of table 1 typical urban sludge of sewage treatment plant
The loss on ignition of mud is higher, on average reaches about 36%, and the content of full nitrogen and full phosphorus is also higher, and this shows and contains higher organic substance in the mud.Organic content height in the mud, its calorific value is also high, shows by mensuration, and the calorific value of sludge from wastewater treatment plant is equivalent to the calorific value of brown coal, reaches the 1/3-1/2 (table 2) of standard coal calorific value.If the heat energy in these mud can be developed, not only can make municipal sludge obtain thoroughly handling safely, and the heat energy that mud is had become valuable resource.
Table 2 sludge from wastewater treatment plant and burning of coal calorific value
Yet, the mud that produces from sewage work, by mechanical dehydration, water ratio if mud can be burnt, must be at first reaches 100% with the solid content of mud generally between 75%-85%, and this means needs a large amount of external energies.Show according to experiment and calculating, make the complete after-flame of mud of water ratio 75%-85%, sludge drying is arrived the needed energy of burning-point, much larger than the energy that sludge incineration produced, this also sludge incineration sludge treatment just need the reason of high cost.We propose to utilize garbage power discharged flue gas waste heat, earlier with sludge drying and granulating, then with the mud granule after the mummification and rubbish, the coal burning electricity generation that is mixed, residue through rubbish, mud and coal behind the combustion power generation, be used for producing light building material, also can utilize the mud granule after the mummification to fire light energy saving brick and produce cement pressing products, thereby realize that sludge from wastewater treatment plant obtains the ultimate aim of thoroughly innoxious, minimizing and recycling treatment, hew out a treatment of wastes with processes of wastes against one another, the recycling economy new way of waste ' s reclamation.
Summary of the invention
Purpose of the present invention just provides a kind of sludge drying and granulating system that utilizes residual heat of exhaust flue gas in garbage power.
System of the present invention comprises that slot type mud stores room, mud feeder, the first revolution drying kiln, second revolution drying kiln, finished house and the exhaust dust device with bag.
Slot type mud stores and to be provided with the mud feeder in the room and mud turns over mixing device, the mud feeder joins by first opening for feed of first worm conveyor and the first revolution drying kiln, and second opening for feed of the second revolution drying kiln joins by second worm conveyor and the first revolution drying kiln; Finished house joins by first conveying belt and the second revolution drying kiln, and joins by second conveying belt and waste incineration and generating electricity device.
Exhaust dust device with bag joins by first ventilator trunk and waste incineration and generating electricity device, and first ventilator trunk is provided with first air door; Induced draft fan joins by four-way airduct road and exhaust dust device with bag on one side, and the other side connects chimney.
The feed end of the first revolution drying kiln and the second revolution drying kiln all joins with second ventilator trunk, second ventilator trunk is provided with second air door, and be respectively arranged with the 3rd air door and the control that control enters the first revolution drying kiln exhaust gas volumn and enter the 4th air door of the second revolution drying kiln exhaust gas volumn, the other end of second ventilator trunk and first ventilator trunk join.
The discharge end of the first revolution drying kiln and the second revolution drying kiln all joins by the 3rd vent-pipe road and first ventilator trunk.
The first revolution drying kiln diameter is 2.0~2.6m, and length is 22.0~30.0m; Second revolution drying kiln diameter is 1.8~2.4m, and length is 20~28m.
The present invention has opened up an effective new way for innoxious, the minimizing and the recycling treatment of sludge from wastewater treatment plant, and its principal feature has:
(1) utilizes the residual heat of exhaust flue gas in garbage power dewatered sludge, maximize the use at the energy that garbage power is produced, when sludge drying is moved, also alleviated hot gas under very low production cost, improved the efficient of bag-type dust simultaneously to atmospheric discharging;
(2) directly to utilize the refuse-burning plant waste heat supply temperature be 200 ℃-130 ℃ flue gas dewatered sludge in the present invention, because mud obtains mummification and forms granule naturally under cold condition, therefore the calorific value that has kept 90% above primary sludge, thereby make the mud after the mummification contribute bigger heat with the rubbish burning electricity generation time, the mud granule after the mummification also can be fired light energy saving brick and produce cement pressing products;
(3) the present invention carries out sludge drying owing to designed air door control garbage power discharged flue gas, therefore, needs maintenance even work as sludge drying system, still can make the smooth and easy discharge of flue gas, can not influence the normal operation of refuse-burning plant.
The present invention utilizes the residual heat to dry sludge of exhaust flue gas in garbage power, can be under the situation that need not consume new forms of energy, the water ratio of sludge of sewage treatment plant is reduced, the heat resource of mud is maximized the use, make municipal sludge really obtain innoxious, minimizing and recycling treatment simultaneously, in fact this opened up a recycling waste, the treatment of wastes with processes of wastes against one another and comprehensively control useless effective way.In ground input trial runs such as jiangsu wuxis, practice shows, adopts this technology can obtain significant social, environment and economic triple benefit in the present invention.
Description of drawings
Fig. 1 is sludge drying of the present invention and granulating system synoptic diagram.
Among the figure: waste incineration and generating electricity device 1, first air door 2, second air door 3, first ventilator trunk 4, second ventilator trunk 5, the 3rd air door 6, the 4th air door 7, the first revolution drying kiln 8, the second revolution drying kiln 9, mud feeder 10, first worm conveyor 11, first opening for feed 12, second worm conveyor 13, second opening for feed 14, first conveying belt 15, the 3rd vent-pipe road 16, exhaust dust device with bag 17, four-way airduct road 18, induced draft fan 19, chimney 20, finished house 21, second conveying belt 22, slot type mud stores room 23, mud turns over mixing device 24.
Embodiment
As shown in Figure 1, utilize the sludge drying of residual heat of exhaust flue gas in garbage power to have mud preprocessing subsystem, charging subsystem, heat supply subsystem, sludge drying and become particIe system, dedusting subsystem with granulating system.
The mud preprocessing subsystem has slot type mud and stores room 23, be provided with mud and turn over mixing device 24 in slot type mud storage room, mud stores room 23 at slot type and stores 2-5 days, and is mixed through turning over turning over of mixing device 24, not only make the mud homogenizing, and make mud spontaneous evaporation portion of water.
The charging subsystem has sewage sludge feed machine 10, first worm conveyor 11, second worm conveyor 13, sewage sludge feed machine 10 will be through pretreated mud by first worm conveyor 11, send into first opening for feed 12 of the first revolution drying kiln 8 equably, carry out first section mummification, second worm conveyor 13 will evenly be sent into second opening for feed 14 of the second revolution drying kiln 9 through the mud after first section mummification, carry out second section mummification.
The heat supply subsystem has waste incineration and generating electricity device 1, first air door 2, second air door 3, first ventilator trunk 4, second ventilator trunk 5, the 3rd air door 6, the 4th air door 7, waste incineration and generating electricity device 1 discharged flue gas temperature is 150 ℃-200 ℃, can directly enter exhaust dust device with bag 17 by 2 controls of first air door by first ventilator trunk 4, enter sludge drying and become particIe system by second ventilator trunk 5 by 3 controls of second air door, the 3rd air door 6 control garbage power discharged flue gas amounts, enter the first revolution drying kiln 8, the 4th air door 7 control garbage power discharged flue gas amounts enter the second revolution drying kiln 9.
Sludge drying with become particIe system have first the revolution drying kiln 8, the second revolution drying kiln 9, first conveying belt 15, finished house 21, second conveying belt 22, after two sections mummification of mud through the first revolution drying kiln 8 and the second revolution drying kiln 9, having formed diameter is 1-10mm, quality is hard and keep the mud granule of original calorific value more than 90%, this mud granule is sent into finished house 21 by first conveying belt 15, send into waste incineration and generating electricity device 1 by second conveying belt 22 then, with rubbish, coal mixing carrying out combustion power generation, the residue in afterburnt is as producing light building material, and diameter is that the mud granule of 2-6mm can be fired light energy saving brick and produce cement pressing products.
The dedusting subsystem has the 3rd vent-pipe road 16, to send into exhaust dust device with bag 17 from the tail gas of the first revolution drying kiln 8 and the second revolution drying kiln 9 by the 3rd vent-pipe road 16, exhaust dust device with bag 17 is connected with four-way airduct road 18, induced draft fan 19, chimney 20 in turn.

Claims (3)

1. utilize the sludge drying and the granulating apparatus of residual heat of exhaust flue gas in garbage power, it is characterized in that this device comprises that slot type mud stores room (23), mud feeder (10), the first revolution drying kiln (8), second revolution drying kiln (9), finished house (21) and the exhaust dust device with bag (17);
Slot type mud stores and to be provided with mud feeder (10) in the room (23) and mud turns over mixing device (24), mud feeder (10) joins by first opening for feed (12) of first worm conveyor (11) with the first revolution drying kiln (8), and second opening for feed (14) of the second revolution drying kiln (9) joins by second worm conveyor (13) and the first revolution drying kiln (8); Finished house (21) joins by first conveying belt (15) and the second revolution drying kiln (9), and joins by second conveying belt (22) and waste incineration and generating electricity device (1);
Exhaust dust device with bag (17) joins by first ventilator trunk (4) and waste incineration and generating electricity device (1), and first ventilator trunk (4) is provided with first air door (2); Induced draft fan (19) joins by four-way airduct road (18) and exhaust dust device with bag (17) on one side, and the other side connects chimney (20);
The feed end of the first revolution drying kiln (8) and the second revolution drying kiln (9) all joins with second ventilator trunk (5), second ventilator trunk (5) is provided with second air door (3), and be respectively arranged with control and enter the 3rd air door (6) of first revolution drying kiln (8) exhaust gas volumn and control and enter second the 4th air door (7) that turns round drying kiln (9) exhaust gas volumn, the other end of second ventilator trunk (5) and first ventilator trunk (4) join;
The discharge end of the first revolution drying kiln (8) and the second revolution drying kiln (9) all joins by the 3rd vent-pipe road (16) and first ventilator trunk (4).
2. sludge drying and the granulating apparatus that utilizes residual heat of exhaust flue gas in garbage power according to claim 1 is characterized in that, described first revolution drying kiln (8) diameter is 2.0~2.6m, and length is 22.0~30.0m.
3. sludge drying and the granulating apparatus that utilizes residual heat of exhaust flue gas in garbage power according to claim 1 is characterized in that, described second revolution drying kiln (9) diameter is 1.8~2.4m, and length is 20.0~28.0m.
CNB2006100523620A 2006-07-07 2006-07-07 Sludge drying and granulating system by using residual heat of exhaust flue gas in garbage power Expired - Fee Related CN100445224C (en)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100462316C (en) * 2007-06-05 2009-02-18 浙江大学 Sludge storing and preheating system utilizing sludge drying tail gas afterheat
CN101792247A (en) * 2010-03-19 2010-08-04 杭州新源环境工程有限公司 Sludge treatment method capable of combining powerful dehydration with low-temperature mummification
CN103409196B (en) * 2013-08-29 2015-01-28 南京侨兴环保设备有限公司 Recycling guiding groove with biomass power generation function
CN105152512A (en) * 2015-08-31 2015-12-16 杭州新源环境工程有限公司 Sludge drying and granulating integrated system with double-layered structure and method of sludge drying and granulating integrated system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1587127A (en) * 2004-07-08 2005-03-02 浙江大学 Reflux type temperature controllable sludge drying device and method
CN1752037A (en) * 2005-07-14 2006-03-29 浙江大学 Integrated system of using garbage power plant smoke residual heat to dry sludge and sludge power generation
CN200952877Y (en) * 2006-07-07 2007-09-26 浙江大学 Sludge drying and granulating system utilizing refuse power generation waste heat

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1587127A (en) * 2004-07-08 2005-03-02 浙江大学 Reflux type temperature controllable sludge drying device and method
CN1752037A (en) * 2005-07-14 2006-03-29 浙江大学 Integrated system of using garbage power plant smoke residual heat to dry sludge and sludge power generation
CN200952877Y (en) * 2006-07-07 2007-09-26 浙江大学 Sludge drying and granulating system utilizing refuse power generation waste heat

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