CN102219346B - System for drying and treating sludge by utilizing afterheat to generate high-temperature circulating air - Google Patents

System for drying and treating sludge by utilizing afterheat to generate high-temperature circulating air Download PDF

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Publication number
CN102219346B
CN102219346B CN 201110137154 CN201110137154A CN102219346B CN 102219346 B CN102219346 B CN 102219346B CN 201110137154 CN201110137154 CN 201110137154 CN 201110137154 A CN201110137154 A CN 201110137154A CN 102219346 B CN102219346 B CN 102219346B
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mud
sludge
high
air
temperature
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CN 201110137154
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CN102219346A (en
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林秀梅
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福建庄讯环保科技有限公司
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Abstract

The invention relates to a system for drying and treating sludge by utilizing afterheat to generate high-temperature circulating air. The system comprises a sludge drying machine, wherein a sludge spiral conveying core shaft is arranged in the sludge drying machine; a hot circulating air outlet is formed on one side of the sludge drying machine; a sludge feed port is formed at the upper end of one side of the sludge drying machine; a sludge discharge port and a hot circulating air inlet are formed on the other side of the sludge drying machine; and a dried waste gas outlet of the sludge drying machine is formed above one side near the sludge feed port. The system is characterized in that: the dried sludge discharged from the sludge discharge port is conveyed to the feed port above a thermolysis furnace through a conveying belt and an elevator; a smoke outlet of the thermolysis furnace is communicated with a dioxin combustion chamber for decomposing dioxin in the smoke; a high-temperature smoke outlet of the dioxin combustion chamber is connected with a heat exchanger through a high-temperature pipeline; and the cooled smoke is led to a power spray device and a bag-type dust remover to be treated and then is discharged to air through a chimney. The system can heat air by utilizing the high-temperature smoke generated in the sludge burning process to indirectly dry sludge, can recycle hot air, and is economical, practical, energy-saving and environment-friendly.

Description

A kind of mud oven dry and treatment system of utilizing waste heat to produce the high temperature circulation air

Technical field

The present invention relates to the sludge incineration treatment technology, particularly a kind of waste heat that utilizes sludge incineration to produce carries out drying system and the oven dry and the treatment system of mud oven dry.

Background technology

Processing to mud has dual mode usually: a kind of is the method for burying, and another kind is a burning method, though the method for burying does not need huge equipment cost; But need the wide place of burying; Constantly increase today that the soil reduces day by day at population, the soil is valuable, is human conditions on which persons or things depend for existence; And bury easy polluted underground water source, cause the environmental issue of serious secondary pollution.And the sludge incineration processing becomes lime-ash with sludge incineration; Reduced the discarded object amount; And avoided polluted source; Therefore sludge incineration is handled and is had advantages such as minimizing is obvious, the cycle short, innoxious, and required in addition site area is much smaller than the area in buried type soot, so the high temperature incineration mode becomes the main selection of Treatment of Sludge gradually.

Yet because the moisture content of mud high (80%), calorific value is low; Directly burning needs to add a large amount of auxiliary fuels, causes the operating cost of its burning too high, and the energy that expends is excessive; Not only have a strong impact on the economic benefit of its Treatment of Sludge, and do not have the environmental benefit of carbon reduction.

Mud can produce pernicious gases such as foul smell, chlorine in the process of oven dry; So must carry out harmless treatment to the waste gas that produces; If directly dry mud with steam or flue gas; Harmless treatment has increased no small difficulty to waste gas to have a large amount of steam in the waste gas, and the increase of tolerance has also improved the input of tail gas treatment device.

If as the heat medium of oven dry mud the accuracy of manufacture, sealed precision, the material of drying plant proposed higher requirement with high temperature oil, water vapour, caused the manufacturing cost increase.

The present invention proposes a kind of high-temperature flue gas that utilizes the burning sludge process to be produced and produces high temperature air through efficient heat exchanger, comes the method for oven dry mud indirectly with high temperature air, and economical and practical, the energy-conserving and environment-protective of this method are the potential methods of a kind of novelty.

Summary of the invention

Problem in view of above-mentioned existence; The present invention has introduced a kind of mud oven dry and treatment system of utilizing waste heat to produce the high temperature circulation air; This system not only can effectively handle the mud of sanitary sewage disposal factory; And can utilize the waste gas (flue gas) that sludge incinerator discharges to produce high temperature air through heat exchanger, dry mud indirectly with high temperature air; High temperature air circulates in the air flue of sealing, and the air of lowering the temperature behind the oven dry mud is got back to heat exchanger again through using economical and practical, energy-conserving and environment-protective after the heat exchange repeatedly.

Technical program of the present invention lies in: a kind of mud oven dry and treatment system of utilizing waste heat to produce the high temperature circulation air; Comprise that inside is provided with the mud dryer of mud helical feed mandrel; One side of said mud dryer is provided with thermal cycle air outlet slit and the sludge inlet that is positioned at the upper end; Its opposite side is provided with mud discharging opening and thermal cycle air intlet; The oven dry waste gas outlet of said mud dryer is arranged near sludge inlet one side top; It is characterized in that: from the charging aperture of oven dry mud through conveyer belt is sent to thermal decomposition furnace with elevator above that the mud discharging opening is discharged, the flue gas exhaust mouth of said thermal decomposition furnace is connected with the dual firing chamber that is used for decomposing the flue gas bioxin, and the high-temperature flue gas exhaust outlet of said dual firing chamber is connected with heat exchanger through high-temperature pipe; Flue gas leads to dusting device and sack cleaner processing through cooling back, after chimney enter in the atmosphere.

Above-mentioned heat exchanger is made up of high-temperature heat exchanger and low temperature heat exchanger series connection; The thermal cycle air outlet slit of said mud dryer is pumped to low temperature heat exchanger and high-temperature heat exchanger and high-temperature flue gas through circulating fan and is carried out heat exchange, and the thermal cycle air outlet slit of said high-temperature heat exchanger is connected with the thermal cycle air intlet of mud dryer through the high temperature circulation pipeline.

Circulating air aeration valve with atmosphere is installed on the thermal cycle air outlet slit of above-mentioned mud dryer and the connecting line between the circulating fan, on the said high temperature circulation pipeline electric heater that is used for the assistant heating hot blast is installed.

The oven dry waste gas outlet of above-mentioned mud dryer is connected with condenser with connecting line through air-introduced machine, is sent to dual firing chamber's combustion decomposition through condensed gas by air-introduced machine and connecting line and handles.

Advantage of the present invention:

1. before the pyrolyzing sludge burning mud is dried processing, can the water content of mud be dropped to 45% from 80%,, make mud be easy to burning owing to improved the calorific value of mud.The sludge incineration process flashes to steam to water and needs a large amount of fuel, has therefore reduced the water content of mud, but mud fuel saving when burning.Reduced the steam that sludge incineration produces, the concentration that also makes flue gas is easy to the spontaneous combustion of flue gas in dual firing chamber not by excessive dilution, dual firing chamber can add less or not refuelling just can decompose the pernicious gas bioxin in the flue gas.Sludge incineration certainly will increase exhaust gas volumn if produce a large amount of steam, and the subsequent treatment of flue gas has been increased difficulty, certainly will improve the equipment input cost.The flue gas that contains steam can produce the haze phenomenon at throat when chimney is discharged.Therefore the oven dry processing before the sludge incineration is an extremely important link in sludge incinerating system, and it plays very important effect to energy-saving and emission-reduction, the minimizing investment of devices of whole system.

2. utilize high-temperature flue gas that sludge incineration produces through high-temperature heat exchanger, low temperature heat exchanger with air heat to 500 ℃, high temperature air is dried processing through the spiral dryer to mud as heat medium, makes the water content of mud drop to 45%.Owing to adopt the indirect mode heating, high temperature air separates with smelly, waste gas that the mud oven dry produces, and high temperature air can recycle in an airtight air flue, reduces the consumption of thermal source.High temperature air under the application normal pressure is as heat medium, and than using water vapour, other medium of high temperature wet goods requires to have reduced many to sealing, the accuracy of manufacture of drying plant.Because steam is high temperature and high pressure gas, gases at high pressure are higher to the faying face seal request of container pressure-bearing and each container.The container of gases at high pressure will be made according to the standard of pressure vessel, though high temperature oil is not a high pressure, high temperature oil container, conveyance conduit cause the leakage of oil to pollute the environment if sealing is improper.Therefore use all corresponding raising of device fabrication precision of steam, high temperature oil.And use the high-temperature pressure air not have pressure, and the leakage of high-temperature pressure air can not pollute environment yet.So its equipment is also simple relatively, low cost of manufacture.

3. usually the incineration of waste system all will be provided with the flue gas cool-down system, the effect of flue gas cool-down system be exactly let high-temperature flue gas (dual firing chamber's outlet temperature can up to 1100 ℃) but cool to the temperature range of follow-up fume treatment auxiliary operate as normal.The present invention utilizes efficient heat exchanger to replace the flue gas cool-down system promptly to reach the cooling flue gas and for the mud oven dry thermal source is provided again.It is that the waste gas (high-temperature flue gas) that makes full use of the sludge incinerator generation is handled carrying out the mud oven dry before the sludge incineration that common dryer all will independently provide thermal source, native system, reaches energy-conservation, reduces discharging the purpose of environmental protection.

Description of drawings

Fig. 1 is the drying machine structure sketch map.

Fig. 2 is the system architecture sketch map of embodiments of the invention.

Fig. 3 is a sludge treatment technique flow chart of the present invention.

Among the figure: 1 is refractory material, and 2 are the thermal cycle air outlet slit, and 3 is sludge inlet, and 4 is the helical feed mandrel, and 5 are mud oven dry conveying interlayer, and 6 are the oven dry waste gas outlet; 7 is helical intake, and 8 are the oven dry waste gas outlet, and 9 is the mud discharging opening, and 10 are the thermal cycle air intlet, and 11 is inlet plenum; 12 is conveyer belt, and 13 is bucket elevator, and 14 is thermal decomposition furnace, and 15 is dual firing chamber, and 16 is high-temperature heat exchanger; 17 is low temperature heat exchanger, and 18 is dusting device, and 19 is sack cleaner, and 20 is air-introduced machine, and 21 is chimney; 22 is the mud dryer, and 23 is circulating fan, and 24 is aeration valve, and 25 is electric heater, and 26 is condenser.

The specific embodiment

For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and conjunction with figs., elaborates as follows.

Please refer to accompanying drawing 1 and Fig. 2; A kind of mud oven dry and treatment system of utilizing waste heat to produce the high temperature circulation air of the present invention; Comprise that inside is provided with the mud dryer 22 of mud helical feed mandrel 4; The axle center of helical feed mandrel 4 is a helical intake, can lead to high temperature air, makes its high temperature air carry out indirect heat exchange with mud abundantly; Said mud helical feed mandrel one end is provided with high temperature air inlet plenum 11; Above inlet plenum 11, be provided with thermal cycle air intlet 10; This form gas-storing capacity is big; Also solved simultaneously turnover gas and connected, seal a difficult problem, atm number is convenient to carry interlayer to carry high temperature air to helical feed mandrel and mud oven dry.Insulation form high insulating effect in air chamber adopts.Helical feed mandrel 4 has air admission hole at axle head air chamber place, and this intake method has overcome with the screwed union air inflow little, the defective of high temperature element easy to wear, and air inlet need not sealing.Mud oven dry carries interlayer 5 air flues to be provided with spoiler, and spoiler is whenever put 12 spoilers at a distance from 2 meters along axis direction, along circle distribution.Spoiler has improved the turbulence level of gas, makes through the mud oven dry to carry the rate of heat exchange of the high temperature air of interlayer to be improved.Helical intake 7 places in the helical feed mandrel, and high-temperature gas has increased turbulivity along helical flow, has improved rate of heat exchange.Be provided with thermal cycle air outlet slit 2 at the discharge chamber left surface.Carry interlayer 5 upper left sides to establish sludge inlet 3 in the mud oven dry; The lower right is provided with mud discharging opening 9; Middle two gas outlets 6; 8 oven dry waste gas outlets for mud drying course generation vapours and waste gas; It is characterized in that: the oven dry mud of discharging from mud discharging opening 9 is sent to the charging aperture of thermal decomposition furnace 14 tops through conveyer belt 12 and bucket elevator 13, and the flue gas exhaust mouth of said thermal decomposition furnace 14 is connected with the dual firing chamber 15 that is used for decomposing the flue gas bioxin, and the high-temperature flue gas exhaust outlet of said dual firing chamber 15 is connected with heat exchanger through high-temperature pipe; Flue gas leads to dusting device 18 and sack cleaner 19 processing through cooling back, after chimney 21 enter in the atmosphere.

17 series connection constitute above-mentioned heat exchanger with low temperature heat exchanger by high-temperature heat exchanger 16; The thermal cycle air outlet slit of said mud dryer 22 is pumped to low temperature heat exchanger 17 and high-temperature heat exchanger 16 and high-temperature flue gas through circulating fan 23 and is carried out heat exchange, and the thermal cycle air outlet slit of said high-temperature heat exchanger 16 is connected with the thermal cycle air intlet of mud dryer 22 through the high temperature circulation pipeline.

Circulating air aeration valve 24 with atmosphere is installed on the thermal cycle air outlet slit 2 of above-mentioned mud dryer 22 and the connecting line between the circulating fan 23, the electric heater 25 that is used for the assistant heating hot blast is installed on the said high temperature circulation pipeline.

The oven dry waste gas outlet 6,8 of above-mentioned mud dryer 22 is connected with condenser 26 with connecting line through air-introduced machine, is sent to dual firing chamber's 15 combustion decomposition through condensed gas by air-introduced machine and connecting line and handles.

Technological process of the present invention is following:

Please refer to Fig. 3, the mud after drying machine drying is handled is sent into the burning of pyrolyzing sludge stove, and the pyrolyzing sludge combustion process can produce flue gas, contains the bioxin pernicious gas in the flue gas.Bioxin at high temperature is easy to decompose, and stops 1s at 1000 ℃, and stopping the number microsecond at 1100 ℃ can decompose fully.Since mud in the pyrolysis temperature of pyrolysis oven usually between 180 ℃-600 ℃.For De bioxin in the flue gas is decomposed, be transported to dual firing chamber to flue gas, dual firing chamber is equipped with two-period form diesel combustion machine; The unlatching amplitude of combustor or close by design temperature (design temperature feeds back to PLC control system through thermocouple) control is automatically playing a heater stage, because furnace temperature is lower; Need to open combustor dual firing chamber is carried out heat temperature raising; During the pyrolysis gas spontaneous combustion, furnace temperature can rise rapidly and reach design temperature, and auxiliary combustion equipment is then closed automatically.Being warmed to 1000 ℃ through dual firing chamber thoroughly decomposes bioxin.High-temperature flue gas through dual firing chamber's burning gets into efficient heat exchanger through high-temperature pipe.(common heat exchanger operating temperature is no more than 400 ℃ through high-temperature heat exchanger, low temperature heat exchanger heat; And 1000 ℃ of the operating temperatures of the heat exchanger of this system; Material, structure to heat exchanger have proposed specific (special) requirements; Material will adopt exotic material, because operating temperature is at 1000 ℃, the amount of expanding with heat and contract with cold of heat exchanger is big; Therefore structure being had specific (special) requirements) exchange is warmed to 500 ℃ with the heat medium-air of dryer from 150 ℃, and flue gas is also reduced to 180 ℃ from 1000 ℃ through heat exchange temperature.Flue gas passes through dusting device (activated carbon powder or calcium hydroxide etc.) again, sack cleaner reaches discharge standard after chimney is drained.

500 ℃ of air are transported to the inlet plenum of dryer through pipeline; Deliver to the mud oven dry respectively by inlet plenum and carry air flue in interlayer air flue and the spiral mandrel; In mud oven dry conveying interlayer air flue and spiral mandrel air flue, be equipped with particular structural to increase the heat exchange specific area, improve rate of heat exchange.Get back to pipeline from the dryer discharge chamber behind the high temperature air process spiral dryer, pipeline is the airtight circulatory system, and air is got back to dryer again behind heat exchanger.Mud drops to 45% through high temperature air oven dry water content from 80%, sends into the burning of pyrolyzing sludge stove again through the mud of oven dry.

The present invention does not limit to above-mentioned preferred forms, and anyone can draw other various forms of mud oven dry and treatment systems of utilizing waste heat to produce the high temperature circulation air under enlightenment of the present invention.All equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims (3)

1. a mud that utilizes waste heat to produce the high temperature circulation air is dried and treatment system; Comprise that inside is provided with the mud dryer of mud helical feed mandrel; One side of said mud dryer is provided with thermal cycle air outlet slit and the sludge inlet that is positioned at the upper end; Its opposite side is provided with mud discharging opening and thermal cycle air intlet; The oven dry waste gas outlet of said mud dryer is arranged near sludge inlet one side top; It is characterized in that: the charging aperture that is sent to the thermal decomposition furnace top from the oven dry mud of mud discharging opening discharge through conveyer belt and elevator; The flue gas exhaust mouth of said thermal decomposition furnace is connected with the dual firing chamber that is used for decomposing the flue gas bioxin, and the high-temperature flue gas exhaust outlet of said dual firing chamber is connected with heat exchanger through high-temperature pipe, and flue gas leads to dusting device and sack cleaner processing through the cooling back; After chimney enter in the atmosphere; Said heat exchanger is made up of the series connection of high-temperature heat exchanger and low temperature heat exchanger, and the thermal cycle air outlet slit of said mud dryer is pumped to low temperature heat exchanger and high-temperature heat exchanger and high-temperature flue gas through circulating fan and carried out heat exchange, and the thermal cycle air outlet slit of said high-temperature heat exchanger is connected with the thermal cycle air intlet of mud dryer through the high temperature circulation pipeline.
2. a kind of mud oven dry and treatment system of utilizing waste heat to produce the high temperature circulation air according to claim 1; It is characterized in that: the circulating air aeration valve with atmosphere is installed on the thermal cycle air outlet slit of said mud dryer and the connecting line between the circulating fan, on the said high temperature circulation pipeline electric heater that is used for the assistant heating hot blast is installed.
3. a kind of mud oven dry and treatment system of utilizing waste heat to produce the high temperature circulation air according to claim 1; It is characterized in that: the oven dry waste gas outlet of said mud dryer is connected with condenser with connecting line through air-introduced machine, is sent to dual firing chamber's combustion decomposition through condensed gas by air-introduced machine and connecting line and handles.
CN 201110137154 2011-05-26 2011-05-26 System for drying and treating sludge by utilizing afterheat to generate high-temperature circulating air CN102219346B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI458926B (en) * 2011-10-26 2014-11-01 Au Optronics Corp Closed air cycle sludge dryer
CN102435082B (en) * 2011-10-28 2013-07-31 北京建筑材料科学研究总院有限公司 Two-phase heat exchanger and system utilizing cement kiln waste heat to dry sludge
CN103288321B (en) * 2013-04-28 2014-03-05 浙江中科兴环能设备有限公司 Sludge anhydration system
CN103750504B (en) * 2013-12-31 2015-06-17 昆明特康科技有限公司 Quick normal-temperature drying equipment and normal-temperature drying method for pine pollens
CN103657520B (en) * 2013-12-31 2015-08-26 昆明特康科技有限公司 A kind of powder material and liquid material mixing apparatus
CN104591516B (en) * 2014-12-01 2016-06-29 嵊州领航信息科技有限公司 A kind of feces drying device of waste heat circulation
CN107973500A (en) * 2017-10-25 2018-05-01 中国石油化工股份有限公司 A kind of excess sludge mixed hydrolysis processing unit and method

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Publication number Priority date Publication date Assignee Title
JP2008114173A (en) * 2006-11-06 2008-05-22 Sumitomo Osaka Cement Co Ltd Method and apparatus for treating high-water content organic waste
CN101618930A (en) * 2009-07-28 2010-01-06 清华大学 Mud drying system and use method thereof
CN101913744A (en) * 2010-07-22 2010-12-15 清华大学 Biophysical drying device and method of continuous flow sludge
CN202109741U (en) * 2011-05-26 2012-01-11 福建庄讯环保科技有限公司 Sludge baking and treatment system utilizing waste heat to generate high-temperature circulation air

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008114173A (en) * 2006-11-06 2008-05-22 Sumitomo Osaka Cement Co Ltd Method and apparatus for treating high-water content organic waste
CN101618930A (en) * 2009-07-28 2010-01-06 清华大学 Mud drying system and use method thereof
CN101913744A (en) * 2010-07-22 2010-12-15 清华大学 Biophysical drying device and method of continuous flow sludge
CN202109741U (en) * 2011-05-26 2012-01-11 福建庄讯环保科技有限公司 Sludge baking and treatment system utilizing waste heat to generate high-temperature circulation air

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