CN105439409A - Sludge and straw mixed squeezing treatment method and device - Google Patents
Sludge and straw mixed squeezing treatment method and device Download PDFInfo
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- CN105439409A CN105439409A CN201510799625.3A CN201510799625A CN105439409A CN 105439409 A CN105439409 A CN 105439409A CN 201510799625 A CN201510799625 A CN 201510799625A CN 105439409 A CN105439409 A CN 105439409A
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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
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/10—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses
-
- 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
- C02F2303/06—Sludge reduction, e.g. by lysis
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/24—Mixing, stirring of fuel components
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/30—Pressing, compressing or compacting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/20—Dewatering by mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/70—Blending
- F23G2201/702—Blending with other waste
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/80—Shredding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Sustainable Energy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a sludge and straw mixed squeezing treatment method and device. The method comprises the following steps: step S1: pre-treating the sludge so as to remove partial water in the sludge, and allowing the water content of the sludge to be decreased to 75 to 85 percent; step S2: crushing straws to a target granularity, and mixing the crushed straws with the sludge in the step S1; and step S3: squeezing and dehydrating a mixture obtained in the step S2 to obtain a squeezed filter cake. The sludge and straw mixed squeezing treatment method and device have the following advantages: 1, the sludge and the straw powder are ensured to be uniformly mixed; a screw transport mixer is employed in the stirring and mixing process of the sludge and the straw powder, and the rotation speed of the screw transport mixer is 40 to 60 rpm/min, so that the sludge and the straw powder are uniformly mixed, and the sludge and the straw are transported forwards while in stirring and mixing, therefore, not only can the mixing time be controlled, but also the sludge is not thinned due to the excessively stirring, and the adherence of the sludge onto the wall is avoided; and 2, the water content is low after the sludge is squeezed, so that the total heat value is increased.
Description
Technical field
The present invention relates to a kind of mud mix with agriculture waste stalk squeeze after for the technology of garbage burning factory, be applicable to waste incineration and generating electricity project.The method can realize the minimizing of mud, stabilization, innoxious and recycling, belongs to specific resistance to filtration technical field.
Background technology
Municipal sludge, as the inevitable outcome of sewage work, is the solid waste that city domestic sewage and trade effluent produce in treating processes.Along with the development of society and the raising gradually of standard of living, the output of municipal effluent also growing, thus result in the increase of municipal sludge output.According to statistics, the sludge quantity that current China discharges every year is about 2,200 ten thousand tons (water ratio is by 80%), and if so the municipal sludge of enormous amount can not get appropriate disposal and will cause secondary pollution to environment.Sludge pollution is one of subject matter becoming public attention.
At present on the basis of traditional mud, a lot of researchist both domestic and external has carried out more exploratory development in the aspect such as innoxious, minimizing, stabilization, resource utilization to mud.As by mud for the preparation of building materials, cracking liquefaction or prepare some sorbing materials etc.But above-mentioned research does not also get a lot of applications.
China is a large agricultural country, has abundant agricultural straw resource, and the north is main based on wheat, maize straw, and south is then based on straw.According to statistics, the annual production of the existing agricultural crop straw of China is about 700,000,000 tons, but because people are to stalk resource comprehensive utilization understanding deficiency, causes the utilization ratio of stalk very low.Meanwhile, crop straw burning and the phenomenon arbitrarily abandoned also of common occurrence, be not only the significant wastage to agricultural straw resource, and cause environmental pollution.
Stalk calorific value is higher, and combust also high (more than 65%), burns if directly enter stove, combustion time is extremely short, and the general calorific value of mud is not high, and particularly the sewage treatment plant inflow of China contains a large amount of trade effluent, heavy metal content is high, can not be agricultural, also difficult directly burning.
Mud mixes fuel processed with stalk still need to consider environment whether close friend, cost, energy consumption, occupation of land and treatment effect etc., selects not only economy but also environmentally friendly sludge straw mixing fuel technology processed to be the keys of specific resistance to filtration.
Mud prepares solid fuel normally by fuel obtained after the mixing mouldings such as semi-dry sludge and auxiliary fuel (coal, wood chip, stalk etc.), stablizer, auxiliary fuel adding proportion large (about 50%).Mud needs mummification or semi-oriented, adds somewhat to mud and prepares solid-fuelled cost, limit the application of technology.
Prior art discloses sludge synthetic fuel and preparation method thereof, comprise biochemical treatment blending device, solidification treatment blending device, fuel synthesis blending device, shredder assembly, drying installation, fuel forming device, synthol is made up of mud, stalk, coal dust, ignition dope, and the synthol calorific value after preparation reaches more than 5000kcal/kg.But adopt desiccating method to make water ratio be down to about 20% energy consumption needed comparatively greatly, and do not provide fuel area density to the whole system of incineration plant.
Prior art also discloses the application of biomass fuel of mud-stalk-raw coal and preparation method thereof and fuel slag, first by the pre-treatment of lime to mud, aerobic compost dehydration again through mud, stalk makes water ratio be down to 50%, again mud, stalk mixture are mixed with raw coal, last compression moulding.But processed is consuming time longer 15 ~ 50 days to adopt aerobic compost to carry out mud, stalk, and utilising efficiency is lower, and the foul smell that sludge composting produces exists secondary pollution.
Above method all solves the problem that mud and stalk calorific value utilize, but mud mix with stalk squeeze after the method for burning still there is problem: one, mud and stalk need be improved further from the whole process being mixed into burning; Its two, energy consumption need be reduced further, raise the efficiency moisture percentage in sewage sludge is reduced further; Its three, avoid preparation system to the secondary pollution problem of environment.
Summary of the invention
In summary of the invention part, introduce the concept of a series of reduced form, this will further describe in embodiment part.Summary of the invention part of the present invention does not also mean that the key feature and essential features that will attempt to limit technical scheme required for protection, does not more mean that the protection domain attempting to determine technical scheme required for protection.
One aspect of the present invention provides a kind of mud and mixes the treatment process of squeezing with stalk, comprising:
Step S1: carry out pre-treatment to mud, to remove the part water in described mud, makes moisture percentage in sewage sludge be down to 75-85%, and such as about 80%;
Step S2: stalk is carried out being crushed to targeted particle size, and mix with the described mud in described step S1;
Step S3: carry out press dewatering by obtaining mixture in described step S2, to obtain squeezing filter cake.
Alternatively, in described step S2, the dosage of described stalk is 10 ~ 40% of mud oven-dry weight quality.
Alternatively, described stalk is broken into the straw powder of 20 ~ 30mm in described step S2.
Alternatively, comprise at described step S1:
Step S11: carry out preliminary hydro-extraction to described mud, to remove the part water in described mud;
Step S12: carry out materialization coagulation to described mud, to carry out modification to described mud.
Alternatively, in described step S3, the water ratio of described mixture is reduced to 50 ~ 55%.
Alternatively, described method also comprises step S4 further: by described squeezing filter cake and rubbish mixed firing.
Alternatively, the burning amount of mixing of wherein said squeezing filter cake and rubbish is about 10% of described rubbish quality.
Alternatively, described stalk is agriculture waste stalk.
Present invention also offers a kind of squeezing filter cake prepared based on aforesaid method.
Present invention also offers a kind of device based on aforesaid method, comprising: the pretreatment unit connected successively, mix and blend unit and squeezing unit,
Wherein, described pretreatment unit, for carrying out pre-treatment to mud, to remove the part water in described mud, and is undertaken being crushed to targeted particle size by stalk;
Described mix and blend unit, for being uniformly mixed the described stalk pulverized and described mud;
Described squeezing unit, for carrying out press dewatering by obtaining mixture in described combination treatment unit, to obtain squeezing filter cake.
Alternatively, described device also comprises semi-dry sludge supply unit further, burns together with rubbish for being delivered in incinerator by described squeezing filter cake.
The present invention has had both the process of sewage plant sludge and the disposal process of incineration plant mud, disposes to the process of mud and agriculture waste stalk the method proposing whole set of system.
The conveying of the Homogeneous phase mixing focusing on mud and stalk powder of this programme, high pressure sheet frame press dewatering, semi-dry sludge, can realize economical and efficient eco-friendly specific resistance to filtration target again completely.
The present invention has the following advantages:
1. ensure that mud mixes with straw powder.
The mud of water ratio 80% and the process that is uniformly mixed of straw powder adopt helical feed mixing machine, rotating speed is 40 ~ 60rpm/min, make mud and straw powder Homogeneous phase mixing, be fed forward while mud and stalk are uniformly mixed, the time mixed can not only be controlled, make mud not thinning because of excessive whipping, avoid mud to glue wall.
2. after sludge pressing, water ratio is low, improves overall calorific value.
Because the present invention adopts mud to mix to squeeze with flocculation agent, stalk and process, fully utilize the synergy of the means such as physical-chemical and kinetics, destroy the original colloidal state structure of mud, impel hydrophilic organic colloid material decomposition in mud, reduce the avidity between muddy water, change existence form and the character of moisture in mud, the water ratio of mud finally can be made to be down to 50 ~ 55%.
3. solve mud and stalk burns separately faced difficulties.
Although stalk calorific value is higher, its volatile content is also high, all more than 65%, if directly enter stove to burn, combustion time is extremely short, and the general calorific value of mud is not high, can not be agricultural, also difficult directly burning, but it has plasticity, by mud and stalk associated treatment, not only increase the calorific value of mud, also improve the utilization ratio of stalk, after squeezing, filter cake calorific value is up to more than 800kcal/kg.
4. achieve the resource utilization of specific resistance to filtration with the collaborative burning of rubbish.
Mud after squeezing and stalk mixture are delivered to incinerator through delivery system, are 5 ~ 10% with the quality fuel mixing ratio of rubbish, realize the Thorough combustion of mud and stalk.
5. a whole set of specific resistance to filtration flow process is provided.
Accompanying drawing explanation
Following accompanying drawing of the present invention in this as a part of the present invention for understanding the present invention.Shown in the drawings of embodiments of the invention and description thereof, be used for explaining principle of the present invention.In the accompanying drawings,
Fig. 1 be in the present invention mud mix with agriculture waste stalk squeeze after for the process flow sheet of garbage burning factory.
Embodiment
In the following description, a large amount of concrete details is given to provide more thorough understanding of the invention.But, it will be apparent to one skilled in the art that the present invention can be implemented without the need to these details one or more.In other example, in order to avoid obscuring with the present invention, technical characteristics more well known in the art are not described.
Embodiment 1
For overcoming prior art Problems existing, not only economical and efficient but also eco-friendly mixing with agriculture waste stalk for mud squeezed fuel technology processed to the invention provides one.The core of the method is that mud mixes with the straw powder after fragmentation, then carries out sheet frame squeezing machine deep dehydration, and the mud cake after deep dehydration is used for working in coordination with incineration disposal with rubbish.Make moisture percentage in sewage sludge be reduced to 50 ~ 55% further on the one hand, effectively utilize agriculture waste stalk on the other hand, realize the recycling of mud and stalk.
Mud of the present invention mixes with agriculture waste stalk and squeezes treatment process, comprising:
Step S1: carry out pre-treatment to mud, to remove the part water in described mud;
Step S2: agriculture waste stalk is carried out being crushed to targeted particle size, and mix with the described mud in described step S1;
Step S3: carry out press dewatering by obtaining mixture in described step S2, to obtain squeezing filter cake;
Step S4: by described squeezing filter cake and rubbish mixed firing.
Particularly, as shown in Figure 1, technical scheme of the present invention mainly comprises mix and blend step, press dewatering step, semi-dry sludge supplying step, and concrete steps mainly contain three aspects:
The first step, mud mixes with stalk.
With crusher, stalk is broken into the straw powder of 20 ~ 30mm, by the mud of water ratio after primary dewatering about 80% first after flocculation agent effect, with stalk powder Homogeneous phase mixing.Stalk powder dosage is 10 ~ 40% mass percents of mud oven-dry weight, through the Homogeneous phase mixing of the mud of stalk powder and water ratio 80%, improve the original colloidal state structure of dewatered sludge, reduce the avidity between muddy water, change existence form and the character of moisture in mud, improve the dewatering of mud.
Above-mentioned mixing equipment can adopt commercially available helical feed mixing machine, oar blade type to carry mixing machine etc.
Second step, sludge pressing dewaters.
Mud and stalk mixture are sent into sheet frame squeezing machine through pumping of screw pump, and squeeze force can reach more than 4.5MPa.Mud and stalk mixture are after board and frame machine squeezes, and the water ratio of mud is reduced to 50 ~ 55%, and filtrate is back to Sewage Plant import.Mud after sheet frame press dewatering can keep the calorific value of self and stalk, and after making squeezing, the overall thermal value of filter cake is improved, and filter cake calorific value reaches more than 800kcal/kg.
The equipment that above-mentioned press dewatering step adopts has: spiral pump, sheet frame squeezing machine.
3rd step, filter cake is delivered to garbage burning factory.
After filter cake is transported to garbage burning factory by lorry, first pours mud into and receive hopper, be delivered to 1# scrapper conveyor by two-screw conveyer, then be promoted to 2# scrapper conveyor by chapelet, be finally delivered to incinerator opening for feed by rotary conveyor.
Mud hopper adopts inverted trapezoidal shape, ensures that mud blanking is smooth and easy.
Mud hopper discharge port configures a duplex conveying crusher, by the move toward one another of a pair spiral, eliminate material and pile up in hopper, also have certain crushing effect to the mud cake of bulk simultaneously, adopt speed control by frequency variation stablize and control logistics, ensure suitable mass transport ability.
Duplex conveying crusher outlet connection 1# scrapper conveyor, conveying, transhipment mud enter chapelet, and whole process ensures to seal completely, and when also ensureing to carry, material is stable.
Mud enters chapelet by 1# scrapper conveyor, chapelet by sludge lifting to the 2# scrapper conveyor in trash repository, rotary conveyor is transported to by 2# scrapper conveyor, the leading portion of rotary conveyor on each garbage feeding bucket top and rear end respectively establish an electronic Double-sided plough type unloader respectively, make incinerator opening for feed mud granule external diameter at 8 ~ 12mm, ensure that mud can evenly enter incinerator opening for feed.Incinerator adopts the forms such as grate furnace, rotary kiln, fluidized-bed.
The burning amount of mixing of filter cake and rubbish is mass percent 5 ~ 10%.
Embodiment 2
Certain municipal sewage plant, sewage disposal scale is 40,000 tons/day, and second pond mud volume (water ratio 99%) is 480 tons/day.By the excess sludge of second pond through belt filter press press filtration process, flocculation agent adopts commercially available PAM, dosage is 0.5% mass percent of mud oven-dry weight, and belt filter press mud extraction water ratio is about 82%, then belt filter press mud volume is 26.7 tons/day (water ratio 82%).
Enter sludge straw mixing squeezing incineration system from the mud after belt filter press process, carry out following 3 processes:
(1) stalk crusher in crushing is become 20mm, straw powder, flocculation agent are mixed with mud uniform stirring in mixing machine of water ratio 82%, stirrer rotating speed is 40rpm/min, straw powder dosage is 20% mass percent of mud oven-dry weight, flocculation agent adopts polymerize aluminum chloride, and dosage is 2% mass percent (by 80%);
(2) mixture that mud mixes with stalk is sent into sheet frame squeezing machine by pumping of screw pump, the maximum squeeze force of sheet frame squeezing machine is 5.0MPa, after the process of sheet frame squeezing machine, the water ratio of mud is down to 54%, filter cake drops down onto spiral crushing transfer roller, particle diameter is about 10cm, and filtrate is back to Sewage Plant import.Mixture calorific value after sheet frame squeezing of sludge straw reaches about 1000Kcal/kg;
(3) will be delivered in lorry by rotary conveyor after mud and the fragmentation of stalk mixture after squeezing, be transported to garbage burning factory and rubbish by lorry and work in coordination with and burn.After filter cake is transported to incineration plant, receives hopper, two-screw conveyer, 1# scrapper conveyor, chapelet, 2# scrapper conveyor by mud successively, be finally delivered to incinerator opening for feed by rotary conveyor.Mud receives hopper and adopts inverted trapezoidal, and it is suitable for reading is square, and be of a size of 4000mm × 4000mm, end opening is rectangle, is of a size of 1500mm × 600mm, and height 5000mm, cubic capacity is about 50m3.The operational throughput 6m of scrapper conveyor is determined according to Q=Av ρ Ψ (wherein: A is that on scraper conveyor middle groove, material loads cross-sectional area, and v is scraper chain travelling speed, and ρ is solid accumulation density, and Ψ is scraper conveyor middle groove coefficient of fullness, value 0.65 ~ 0.9)
3/ h, incinerator opening for feed mud granule external diameter is 10mm.The burning amount of mixing of filter cake and rubbish is mass percent 8%.
Embodiment 3
Certain municipal sewage plant, sewage disposal scale is 100,000 tons/day, and second pond mud volume (water ratio 99%) is 1200 tons/day.By the excess sludge of second pond through belt filter press press filtration process, flocculation agent adopts commercially available PAM, dosage is 0.3% mass percent of mud oven-dry weight, and belt filter press mud extraction water ratio is about 80%, then belt filter press mud volume is 60 tons/day (water ratio 80%).
Enter sludge straw mixing squeezing incineration system from the mud after belt filter press process, carry out following 3 processes:
(1) stalk crusher in crushing is become 25mm, straw powder, flocculation agent are mixed with mud uniform stirring in mixing machine of water ratio 82%, stirrer rotating speed is 50rpm/min, straw powder dosage is 10% mass percent of mud oven-dry weight, flocculation agent adopts polymerize aluminum chloride, and dosage is 3% mass percent (by 80%);
(2) mixture that mud mixes with stalk is sent into sheet frame squeezing machine by pumping of screw pump, the maximum squeeze force of sheet frame squeezing machine is 5.0MPa, after the process of sheet frame squeezing machine, the water ratio of mud is down to 55%, filter cake drops down onto spiral crushing transfer roller, particle diameter is about 8cm, and filtrate is back to Sewage Plant import.Mixture calorific value after sheet frame squeezing of sludge straw reaches about 1200Kcal/kg;
(3) will be delivered in lorry by rotary conveyor after mud and the fragmentation of stalk mixture after squeezing, be transported to garbage burning factory and rubbish by lorry and work in coordination with and burn.After filter cake is transported to incineration plant, receives hopper, two-screw conveyer, 1# scrapper conveyor, chapelet, 2# scrapper conveyor by mud successively, be finally delivered to incinerator opening for feed by rotary conveyor.Mud receives hopper and adopts inverted trapezoidal, and it is suitable for reading is square, and be of a size of 5000mm × 5000mm, end opening is rectangle, is of a size of 1600mm × 800mm, and height 6000mm, cubic capacity is about 80m3.The operational throughput 7m of scrapper conveyor is determined according to Q=Av ρ Ψ (wherein: A is that on scraper conveyor middle groove, material loads cross-sectional area, and v is scraper chain travelling speed, and ρ is solid accumulation density, and Ψ is scraper conveyor middle groove coefficient of fullness, value 0.65 ~ 0.9)
3/ h, incinerator opening for feed mud granule external diameter is 8mm.The burning amount of mixing of filter cake and rubbish is mass percent 10%.
Embodiment 4
In addition, present invention also offers a kind of mud and mix with agriculture waste stalk and squeeze treatment unit, comprising:
The pretreatment unit connected successively, mix and blend unit and squeezing unit,
Wherein, described pretreatment unit, for carrying out pre-treatment to mud, to remove the part water in described mud, is undertaken being crushed to targeted particle size by agriculture waste stalk;
Described mix and blend unit, for being uniformly mixed the described agriculture waste stalk pulverized and described mud;
Described squeezing unit.For carrying out press dewatering by obtaining mixture in described combination treatment unit, to obtain squeezing filter cake.
Alternatively, described device also comprises semi-dry sludge supply unit further, burns together with rubbish for being delivered in incinerator by described squeezing filter cake.
Technical scheme of the present invention mainly comprises mixing and stirring system, press dewatering system, semi-dry sludge delivery system, and concrete steps mainly contain three aspects:
The first step, mud mixes with stalk.
Wherein, mixing equipment can adopt commercially available helical feed mixing machine, oar blade type to carry mixing machine etc.
Wherein, the equipment that press dewatering step adopts has: spiral pump, sheet frame squeezing machine.
After filter cake is transported to garbage burning factory by lorry, first pours mud into and receive hopper, be delivered to 1# scrapper conveyor by two-screw conveyer, then be promoted to 2# scrapper conveyor by chapelet, be finally delivered to incinerator opening for feed by rotary conveyor.
Mud hopper adopts inverted trapezoidal shape, ensures that mud blanking is smooth and easy.
Mud hopper discharge port configures a duplex conveying crusher, by the move toward one another of a pair spiral, eliminate material and pile up in hopper, also have certain crushing effect to the mud cake of bulk simultaneously, adopt speed control by frequency variation stablize and control logistics, ensure suitable mass transport ability.
Duplex conveying crusher outlet connection 1# scrapper conveyor, conveying, transhipment mud enter chapelet, and whole process ensures to seal completely, and when also ensureing to carry, material is stable.
Mud enters chapelet by 1# scrapper conveyor, chapelet by sludge lifting to the 2# scrapper conveyor in trash repository, rotary conveyor is transported to by 2# scrapper conveyor, the leading portion of rotary conveyor on each garbage feeding bucket top and rear end respectively establish an electronic Double-sided plough type unloader respectively, make incinerator opening for feed mud granule external diameter at 8 ~ 12mm, ensure that mud can evenly enter incinerator opening for feed.Incinerator adopts the forms such as grate furnace, rotary kiln, fluidized-bed.
The present invention has the following advantages:
1. ensure that mud mixes with straw powder.
The process that is uniformly mixed of mud and straw powder adopts helical feed mixing machine, rotating speed is 40 ~ 60rpm/min, make mud and straw powder Homogeneous phase mixing, be fed forward while mud and stalk are uniformly mixed, the time mixed can not only be controlled, make mud not thinning because of excessive whipping, avoid mud to glue wall.
2. after sludge pressing, water ratio is low, improves overall calorific value.
Because the present invention adopts mud to mix to squeeze with flocculation agent, stalk and process, fully utilize the synergy of the means such as physical-chemical and kinetics, destroy the original colloidal state structure of mud, impel hydrophilic organic colloid material decomposition in mud, reduce the avidity between muddy water, change existence form and the character of moisture in mud, the water ratio of mud finally can be made to be down to 50 ~ 55%.
3. solve mud and stalk burns separately faced difficulties.
Although stalk calorific value is higher, its volatile content is also high, all more than 65%, if directly enter stove to burn, combustion time is extremely short, and the general calorific value of mud is not high, can not be agricultural, also difficult directly burning, but it has plasticity, by mud and stalk associated treatment, not only increase the calorific value of mud, also improve the utilization ratio of stalk, after squeezing, filter cake calorific value is up to more than 800kcal/kg.
4. achieve the resource utilization of specific resistance to filtration with the collaborative burning of rubbish.
Mud after squeezing and stalk mixture are delivered to incinerator through delivery system, are 5 ~ 10% with the quality fuel mixing ratio of rubbish, realize the Thorough combustion of mud and stalk.
5. a whole set of specific resistance to filtration flow process is provided.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just for the object of illustrating and illustrate, and is not intended to the present invention to be limited in described scope of embodiments.In addition it will be appreciated by persons skilled in the art that the present invention is not limited to above-described embodiment, more kinds of variants and modifications can also be made according to instruction of the present invention, within these variants and modifications all drop on the present invention's scope required for protection.Protection scope of the present invention defined by the appended claims and equivalent scope thereof.
Claims (11)
1. mud mixes a treatment process of squeezing with stalk, comprising:
Step S1: carry out pre-treatment to mud, to remove the part water in described mud, makes moisture percentage in sewage sludge be down to 75-85%;
Step S2: stalk is carried out being crushed to targeted particle size, and mix with the described mud in described step S1;
Step S3: carry out press dewatering by obtaining mixture in described step S2, to obtain squeezing filter cake.
2. method according to claim 1, is characterized in that, in described step S2, the dosage of described stalk is 10 ~ 40% of mud oven-dry weight quality.
3. method according to claim 1, is characterized in that, described stalk is broken into the straw powder of 20 ~ 30mm in described step S2.
4. method according to claim 1, is characterized in that, comprises at described step S1:
Step S11: carry out preliminary hydro-extraction to described mud, to remove the part water in described mud, makes moisture percentage in sewage sludge be down to about 75-85%;
Step S12: carry out materialization coagulation to described mud, to carry out modification to described mud.
5. method according to claim 1, is characterized in that, in described step S3, the water ratio of described mixture is reduced to 50 ~ 55%.
6. method according to claim 1, is characterized in that, described method also comprises step S4 further: by described squeezing filter cake and rubbish mixed firing.
7. method according to claim 6, is characterized in that, the burning amount of mixing of wherein said squeezing filter cake and rubbish is 10% of described rubbish quality.
8. method according to claim 1, is characterized in that, described stalk is agriculture waste stalk.
9. the squeezing filter cake prepared based on the described method of one of claim 1 to 8.
10. based on a device for the described method of one of claim 1 to 8, comprising: the pretreatment unit connected successively, mix and blend unit and squeezing unit,
Wherein, described pretreatment unit, for carrying out pre-treatment to mud, to remove the part water in described mud, and is undertaken being crushed to targeted particle size by stalk;
Described mix and blend unit, for being uniformly mixed the described stalk pulverized and described mud;
Described squeezing unit, for carrying out press dewatering by obtaining mixture in described combination treatment unit, to obtain squeezing filter cake.
11. devices according to claim 10, is characterized in that, described device also comprises semi-dry sludge supply unit further, burn together with rubbish for being delivered in incinerator by described squeezing filter cake.
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