CN103663896A - Method and device for stabilizing heavy metal through pyrolysis of sludge - Google Patents
Method and device for stabilizing heavy metal through pyrolysis of sludge Download PDFInfo
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a method and a device for stabilizing heavy metal through pyrolysis of sludge. The method comprises the following steps: uniformly mixing dewatered sludge with moisture content of 0%-80% with hazardous waste containing heavy metal needing to be processed, wherein the dry basis heat value of the mixed material is guaranteed not less than 9000kJ/kg; drying the sludge mixed with hazardous waste containing heavy metal, then putting into a pyrolyzer for pyrolysis at 350-750 DEG C, preferably, at 450-650 DEG C; online burning the volatile components generated in pyrolysis so as to offer heat required by the pyrolyzer, wherein the formed cokes are cooled down and then sent to a sanitary landfill or are reused as catalyst. The device for stabilizing heavy metal through pyrolysis of sludge comprises a mixer for sludge and hazardous waste containing heavy metal, a dryer for drying mixture of sludge and hazardous waste containing heavy metal, the pyrolyzer, a gas storage tank and a combustion chamber for pyrolyzing volatile components, as well as a cooler for pyrolyzing carbon. The method and the device for stabilizing heavy metal through pyrolysis of sludge have the advantages that hazardous waste containing heavy metal and other contaminants can be processed while in sludge pyrolysis, and extra cost for investment and processing is not increased.
Description
Technical field
The invention belongs to sludge disposal and recycling treatment field.Particularly, the present invention relates to a kind of method and apparatus that utilizes pyrolyzing sludge to stablize non-volatile heavy metal.
Background technology
Sewage work can produce a large amount of mud in the process of disposing of sewage, and is mainly microorganism remnants, organic pollutant and the inorganic foreign material of part.The sludge yield of municipal sewage plant is about 1% left and right of sewage quantity, mud moisture 97%.As day is processed 100,000 M
3sewage Plant, daily output mud 1000M
3mud (moisture 97%).The dewatered sludge water ratio that mud forms after dehydration, generally in 80% effect, adopts advanced dehydration technique of the prior art water ratio can be reduced to 70% ~ 65%.The annual sludge creation amount in China city nearly 3,000 ten thousand tons (in water ratio 80%).Except municipal sewage treatment produces mud, also have a large amount of industrial sewages a large amount of mud of having processed also output, for example China's paper-making industrial waste water lignin-sludge total amount just reaches 3,500,000～4,500,000 t/.If sludge treatment is not well solved while disposing, there is serious secondary pollution risk, at present treatment process: burning, landfill, compost; In addition pyrolyzing sludge technology, through years development, becomes practical technique gradually.Pyrolytic technique in existing method for sludge treatment is mainly used to dispose mud, and residual Jiao of pyrolysis or as fuel, or as soil improvement agent.Existing research shows in residual Jiao of pyrolyzing sludge that heavy-metal residual is approximately more than 90%, and leaching amount is all very little, even leaches (research of sewage sludge cracking target product and residual burnt Promoting plant growth, environmental science, 2011,32 (9): 2604-2609; Fate of heavy metals and radioactive metals in gasification of sewage sludge, Waste Management 2004,24:193 – 198; Behavior of Chromium, Nickel, Copper, Zinc, Cadmium, Mercury, and Lead during the Pyrolysis of Sewage Sludge. Environ. Sci.Technol, 1987,21:704-708).
But in existing sludge disposal technology, the effect of this stabilizing heavy metal of pyrolyzing sludge charcoal is not brought into play.On the other hand, the Hazardous wastes that contains in a large number heavy metal that all trades and professions produce but spends sizable cost to carry out incineration disposal or sends into the security landfill factory and office that rank is high, expense is high and put, not only waste money, and very easy generation secondary pollution.
In view of can not meeting the Hazardous wastes, the mud itself that utilize on a large scale the heavy metal stabilising effect of pyrolyzing sludge charcoal to come active process to contain heavy metal, existing mud carbonization technology processes that cost is high, expense is large; Hazardous wastes is processed the present situation that cost is higher, expense is more expensive, the present invention propose a kind of efficient, economical, feasible, do not increase secondary pollution and save to dispose place and the multiple refuse comprehensive treatment technique of investment, be a kind of method and apparatus that utilizes pyrolyzing sludge stabilizing heavy metal, energy disposing sludge is also utilized the pyrolytic process Simultaneous Stabilization heavy metal of mud and the Hazardous wastes that contains heavy metal.From the angle of entire society, save waste treatment place and process investment.
Summary of the invention
The object of this invention is to provide a kind of method and apparatus that utilizes pyrolyzing sludge stabilizing heavy metal.
A kind of method of utilizing pyrolyzing sludge stabilizing heavy metal that the present invention proposes, the method can also be disposed the Hazardous wastes that other contains heavy metal in pyrolysis disposing sludge.Concrete steps are as follows:
The dewatered sludge of water ratio 0% ~ 80% enters malaxation device 1, evenly mixes with the Hazardous wastes that contains heavy metal to be processed, and after mixing, the butt calorific value of material is not less than 9000kJ/kg; The mud that is mixed with the Hazardous wastes that contains heavy metal is sent into moisture eliminator 2, utilize the dried mixture 3 of any thermal source (preferentially using the waste heat of system flue gas) to deliver to pyrolyzer 4, when mixture water ratio is following lower than 10%, send into pyrolyzer 4, in pyrolyzer 4, carry out pyrolysis and produce volatiles 5 and pyrolytic carbon 10; Controlling pyrolysis temperature is 350 ~ 750 ℃, and it is cooling that the pyrolytic carbon 10 of high temperature is sent into water cooler 11, and cooled charcoal is delivered to final processing links sanitary filling field; Volatiles 5 is divided into two strands and flows through delivery chamber, one volatiles 5 is sent into gas-holder 6 after cooling chamber 16, the inflammable gas of gas-holder 6 is sent into the combustor air inlet pipe being arranged in combustion chamber 6 after by pressure regulating device, as the steady combustion gas body of combustion chamber 6, guarantee that another strand of volatiles directly send without cooling the stable burning of catching fire immediately behind combustion chamber to; Another strand of volatiles directly delivered to combustion chamber 7; The phlegma producing in the phlegma of gas-holder 6 bottoms and process of cooling is sent into pyrolyzer 4 again and is carried out second pyrolysis; The heating surface heat source side that the high-temperature flue gas 8 that combustion chamber 7 produces is sent pyrolyzer 4 back to provides pyrolysis required heat as thermal source; Flue gas after desuperheat 9 is sent into 2 pairs of mixing sludges of moisture eliminator and is dried subsequently; The dry waste gas producing and cooled flue gas respectively or a synthetic plume send into after gas purifier 13 purifies and discharge.
In the present invention, described pyrolysis temperature is preferably 450 ~ 650 ℃.
In the present invention, described in contain heavy metal Hazardous wastes be mud, residue, soil containing one or more metals wherein such as cadmium Cd, plumbous Pb, zinc Zn, chromium Cr, nickel, copper Cu, selenium Se, manganese Mn, beryllium Be, barium Ba or silver-colored Ag; And the flying dust of castoff burning generation.
The device that utilizes pyrolyzing sludge stabilizing heavy metal that the present invention proposes, comprise malaxation device 1, moisture eliminator 2, pyrolyzer 4, gas-holder 6, combustion chamber 7, water cooler 11, cooling chamber 16 and gas pressure regulating and check device 16, wherein: the outlet of malaxation device 1 connects moisture eliminator 2, the mixture outlet of moisture eliminator 2 connects pyrolyzer 4, the gas approach of moisture eliminator 2 connects pyrolyzer 4, the volatiles of pyrolyzer 4 is leaded up to cooling chamber 16 and is connected gas-holder 6, and the volatiles of pyrolyzer 4 is separately leaded up to pipeline and connected combustion chamber 7; The pyrolytic carbon outlet of pyrolyzer 4 connects water cooler 11, and gas-holder 6 is connected combustion chamber 7 with pipeline with check device 17 by gas pressure regulating; Moisture eliminator 2 connects gas purifier 13.
In the present invention, malaxation device 1 can be selected from any device with mix function, and typical selection is the container with agitator, import and outlet; Or the helical feed kncading machine with one or one above screw shaft.
In the present invention, described moisture eliminator 2 can be indirect heating mode, such as selecting vacuum blade dryer, capstan moisture eliminator etc., after entering, flue gas 9 heats mixing sludge by heating surface, the water vapor and the flue gas that from mud side, evaporate purify respectively, this form of preferential selection while containing volatile organic pollutant in Hazardous wastes; Moisture eliminator 2 can also adopt the moisture eliminator of any a direct contact type of the prior art, as rotary-drum drier, belt dryer, fluidized bed dryer etc.; After flue gas 9 enters with the mud of moisture eliminator 2 in direct contact drying, preferred this form while not containing organic pollutant in Hazardous wastes.Through dried mixture water ratio 3, be controlled at 10% and send into again below pyrolyzer 4; In the present invention, described pyrolyzer 4 can be selected the pyrolyzer of any type in prior art, as positive displacement, tubular type and rotary kiln type, preferably there are more than 2 or 2 heating zones and the tubular type or the rotary type pyrolyzer that have 2 fugitive constituents outlet connecting passages at least.Water cooler 10 can be selected any existing water cooler, preferably with the water cooler of helical feed form.
In the present invention, gas-holder 6 is selected from dry-seal gasholder of the prior art or wet gasholder.It is to guarantee the suitable burner combustion being arranged in combustion chamber 6 of sending into of gas that inflammable gas pressure regulates with the effect of check device 17, steady combustion gas body as combustion chamber 6, and stop air-flow to flow backwards, can be selected from any device and device with this effect in prior art, as relief valve connects vacuum breaker.
In the present invention, be furnished with the cooling coil that can collect phlegma in cooling chamber 16, cooling coil inside is cold water or cold wind, and outside is volatiles 5.The phlegma producing is directly sent pyrolyzer 4 second pyrolysises back to.
In the present invention, pyrolyzer 4 be in positive displacement, tubular type or rotary kiln type etc. any, and have 2 volatile matters outlet connecting passages at least.
Adopt the usefulness of the method and apparatus of pyrolyzing sludge stabilizing heavy metal of utilizing provided by the present invention to be:
1) can make pyrolyzing sludge treating processes become in the treating processes of Hazardous wastes, not need to set up two covering devices, or process Hazardous wastes with extra medicament and process unit; This has just been avoided the high disposal expense of Hazardous wastes and has adopted sending into the modes such as security landfill field and processing occupied landfill yard volume, has improved macroeconomic and provides a low cost, respond well outlet for the Hazardous wastes containing heavy metal.And mud this in this process also by appropriate stabilization.
2) due to pyrolysis temperature higher (350 ~ 750 ℃), and in strong reducing property atmosphere; Beyond in Hazardous wastes, removing heavy metals is stablized, as contained organic pollutant, also can be decomposed and detoxification, for example polychlorobiphenyl PCB class material, dioxins materials and Polybrominated biphenyl ethers material simultaneously simultaneously.Add if desired simultaneously lime or alkaline matter can also improve heavy metal stabilising effect and in and the pollution gas in pyrolytic process.
3) by adopting the air flow chamber of two volatiles, 1 air flow chamber 16 with cooling coil and the direct air flow chamber (flow is adjustable) that imports combustion chamber 7 are divided into 2 strands by volatiles, one imports gas-holder as the stable burning gas of combustion chamber, one directly burns, make disposal system reduce minimum to the dependence of external heat source, even if also reached, only have mud butt calorific value enough high, except igniting, do not rely on the outside energy completely and just can move.Greatly improved the accessibility of system layout, the energy consumption that has reduced system requires and processing costs.
4) the cadmium Cd containing in 350 ~ 750 ℃ regulate on a large scale can be stablized Hazardous wastes by pyrolysis temperature, plumbous Pb, zinc Zn, chromium Cr, nickel, copper Cu, selenium Se, manganese Mn, beryllium Be, barium Ba, the heavy metals such as silver-colored Ag.
Accompanying drawing explanation
Fig. 1 utilizes the device of pyrolyzing sludge stabilizing heavy metal.
Number in the figure: 1 malaxation device; 2 moisture eliminators; 3 mixtures; 4 pyrolyzer; 5 volatiles; 6 gas-holder; 7 combustion chambers; 8 high-temperature flue gas; Flue gas after 9 coolings; 10 pyrolytic carbons; 11 water coolers; 12 outward transports; 13 gas purifiers; 14 cooling medium inlets; 15 heat-eliminating medium outlets; 16 cooling chambers; 17 gas pressure regulatings and check device.
Embodiment
Below by embodiment, further illustrate the present invention.
Embodiment 1
The butt calorific value of certain city's sewage sludge is 15500KJ/kg, moisture 82%, and each heavy metal species self containing is all not high.Separately have a collection of flying ash to need to process, flying ash, containing Pb concentration 2800ppm, reaches 400ppm containing Cd concentration, and Han dioxin 3.6ng/g-I TEQ, belongs to Hazardous wastes.During processing, according to 20% of mud dry measure, add flying dust, the butt calorific value of mixture is 12400kJ/kg.And add the wet mud of 18kg wood dust/ton; Or wet mud per ton adds the plastic waste of 7kg pulverizing to supplement pyrolysis energy.In the tank type malaxation device 1 with agitator repeatedly mix, pugging mullering evenly after, send into moisture eliminator 2, moisture eliminator 2 is revolving roll moisture eliminators, flue gas 9 and the direct contact drying of mud, waste gas enters gas purifier 13.After dry, mixture 3 enters pyrolyzer 4 again, pyrolyzer 4 is three sections of inner screw shaft feeding types that adopt of heating, final stage temperature maintains between 450 ℃ ~ 550 ℃, fully after carbonization, pyrolytic carbon 10 is discharged in water cooler 11, and water cooler 11 is that the helical feed tube outside of screw feeding is furnished with water cooling chuck.The charcoal of discharging detects according to standard HJ-T/300, detects leaching concentration Pb lower than 0.25ppm, and Cd is lower than 0.1ppm, meanwhile in flying dust, contained dioxin decomposes, residual concentration 0.06ng/g-I TEQ sends into sanitary filling field, and landfill, avoids contacting with rubbish separately.The i.e. mud blending 40kg flying dust of 1 ton 80%, 1 day, the sludge treatment factory of 200 tons of lignin-sludges can process 8 tons of flying dusts.Whole city's sludge yield surpasses 3500 ton per days (80% moisture content meter), and flying ash output only has 30 ton per days, and all flying dusts all can be processed and needn't be entered security landfill factory by this approach.The disposal investment that adopts mud of the present invention and flying dust lower than 300,000/(ton. day), working cost is lower than 300 yuan/ton of wet mud, and flying dust does not produce extra-pay except trucking costs.Individual curing flying dust, need to build in addition a set of investment cost to be not less than 300,000/(ton. day) expensive facility, and working cost according to the experience of prior art reach 500 yuan/ton or more than.The present invention compared with prior art, has reduced huge investment, and has avoided expensive working cost, plays useful economy, environment protecting.
Embodiment 2
The butt calorific value of certain sewage sludge is 13000KJ/kg, moisture 70%, and each heavy metal species self containing is all not high.What separately have that a collection of chemical plant discharges needs to process containing Cr waste residue, waste residue containing Cr concentration 5900ppm, containing Cd concentration, reach 1000ppm, moisture 40%, butt calorific value 5000kJ/kg, belongs to Hazardous wastes.During processing, according to 5% ~ 10% of mud dry measure, add this waste residue, the butt calorific value of mixture is 10900 ~ 12600 KJ/kg.In the tank type malaxation device 1 of belt stirrer repeatedly mix, stir after, send into moisture eliminator 2, moisture eliminator 2 is revolving roll moisture eliminators, flue gas 9 and the direct contact drying of mud, waste gas enters gas purifier 13.After dry, mixture 3 enters pyrolyzer 4 again, the form of pyrolyzer 4 is identical with embodiment 1, final stage temperature maintains between 450 ℃ ~ 550 ℃, fully after carbonization, form pyrolytic carbon 10 and be discharged to water cooler 11, cooled charcoal detects according to standard HJ-T/300, detects leaching concentration Pb lower than 0.25ppm, Cd is lower than 0.1ppm, send into sanitary filling field, landfill, avoids contacting with rubbish separately.The mud blending of 1 ton 70% can blending 15kg ~ 30kg waste residue, and 1 day, the sludge treatment factory of 100 tons of lignin-sludges can process 1.5 ~ 3 tons, waste residue.Approximately 1.5 ~ 3 tons of every days of the output of this waste residue, only need the pyrolyzing sludge processing plant of 1 day, 100 tons of lignin-sludges, this waste residue can be disposed and enter security landfill factory after needn't adopting complicated stabilization process.
Embodiment 3
The butt calorific value of certain sewage sludge is 12000KJ/kg, and by mummification, water ratio is nearly 0%, and each heavy metal species self containing is all not high.Separately there is a collection of mud containing heavy metal cadmium Cd to need to process; Containing the butt calorific value of cadmium mud, be 3000KJ/kg left and right, can not maintain burning, containing Cd concentration 2900ppm (butt), moisture 60%, leach and check and confirm to belong to typical Hazardous wastes.During processing, according to 5% ~ 10% of mud dry measure, add this waste residue, the butt calorific value of mixture is 11100 ~ 11550 KJ/kg.In the tank type malaxation device 1 of belt stirrer, add a small amount of water by dense and burnedization of dewatered sludge, with containing cadmium mud mix repeatedly, after stirring, send into moisture eliminator 2, moisture eliminator adopts rotating disk type indirect dryer, dried material 3 is sent into pyrolyzer 4, pyrolyzer is three sections of revolution heating-types, the temperature of the 3rd section maintains between 400 ℃ ~ 500 ℃, fully after carbonization, charcoal 10 is discharged to water cooler 11, water cooler 11 is identical with the form of embodiment 1, cooled charcoal detects according to standard HJ-T/300, detect leaching concentration Cd lower than 0.1ppm, send into sanitary filling field, independent landfill, avoid contacting with rubbish.1 ton of dewatered sludge blending 150kg ~ 300kg cadmium mud, 1 day, the dewatered sludge treatment plant of 50 tons of lignin-sludges can process 7.5 ~ 15 tons, cadmium mud.Approximately 7.5 ~ 15 tons of every days of the output of this cadmium mud, only need the pyrolyzing sludge processing plant of 1 day, 50 tons of lignin-sludges, this cadmium mud can be disposed and needn't be with entering security landfill field after complicated stabilization process.
Embodiment 4
The butt calorific value of certain city's sewage sludge is 15300KJ/kg, moisture 80%, and each heavy metal species self containing is all not high.Separately have a collection ofly by polychlorobiphenyl PCBs and Mn, Zn institute contaminated soil needs to process, and this batch of contaminated soil is local severe contamination, and 500 tons of total amounts reach 1500ppm containing PCBs amount, containing manganese Mn, reach 10000ppm, containing zinc, reach 12000ppm.During processing, according to 20% of mud dry measure, add contaminated soil, wet mud per ton adds the wood dust of 15kg and the lime powder of 10kg simultaneously, the calorific value of mixture is 11680kJ/kg, in the Conveyorized malaxation device 1 of double-shaft spiral repeatedly mix, pugging mullering evenly after, send into moisture eliminator 2, moisture eliminator 2 is vacuum blade dryers, flue gas 9 does not directly contact with mud, the first condensation of the dry waste vapour producing, and non-condensable gases is sent into combustion chamber.After flue gas is cooling, entering gas purifier purifies.After dry, mixture 3 enters pyrolyzer 4 again, and pyrolyzer 4 is continuous rotating reactors of two sections of heating, and final stage temperature maintains between 550 ℃ ~ 650 ℃.The volatile matter that energy in pyrolytic process mainly produces from pyrolyzing sludge, at this moment all volatile matters are sent into gas-holder 6 from the conveyor chamber with cooling coil, the wet gasholder that gas-holder 6 adopts high strength glass fiber reinforced plastic to make, in combustion chamber, mend burning part Sweet natural gas makes chamber temperature reach 1100 ℃ of outsides heating of sending into again pyrolyzer 4 later simultaneously, after the abundant carbonization of mixture 3, form pyrolytic carbon 10 and be discharged in water cooler 11, water cooler 11 is that the helical feed tube outside of screw feeding is furnished with water cooling chuck.The charcoal of discharging detects according to standard HJ-T/300, detect leaching concentration Mn lower than 0.25ppm, Zn is lower than 0.35ppm, meanwhile use contained PCBs in gas-chromatography/high resolution mass spectrum (HRGC-HRMS) analysis of test methods soil, find all to decompose, residual concentration is lower than detectability, can send into the independent landfill of landfill factory or as overburden soil.The contaminated soil of mud blending 40kg of 1 ton 80%, 1 day, the sludge treatment factory of 100 tons of lignin-sludges can process 4 tons of contaminated soils.Within 125 days, can process whole contaminated soils and extra facility expense is only temperature cannot reach 1100 ℃ time benefit combusts gas, be unnecessary in most situation.
Embodiment 5
The butt calorific value of certain city's sewage sludge is 15300KJ/kg, moisture 70%, and each heavy metal species self containing is all not high.Separately have one containing Poly Brominated Diphenyl Ethers PBDEs(27 μ g/kg) and containing Cd, Be, the mud that the electronic waste of Cu produces after processing, moisture 60%, without calorific value.Containing Cd, reach 500ppm, Be reaches 155ppm, and Cu content reaches 3000ppm, is butt.Mainly to deposit with villaumite form, while adopting the technology of the present invention to dispose, this industrial sludge is mixed according to the ratio of 1:10 with sewage sludge, separately according to the wet mud of 5kg/ ton, add lime, by the malaxation device pugging mullering of twin shaft kncading machine form, mixed, the butt calorific value of mixture is 13434kJ/kg, sends into vacuum Paddle dryer, and then dried mixture is sent into pyrolyzer, pyrolyzer adopts the helical feed formula pyrolyzer of two-section type heating, and there is the heating of flue gas sleeve pipe in outside.The steam alkali lye condensation that dried side produces, non-condensable gases imports combustion chamber.After sending into purification utensil after flue gas is cooling, discharge.Pyrolysis temperature in pyrolyzer maintains between 350 ~ 450 ℃, after volatile matter approximately 2/3 that pyrolysis produces is cooling, send into gas-holder, approximately 1/3 volatile matter directly imports combustion chambers burn, when 1000 ℃ of combustor exit flue-gas temperature less thaies, drop into auxiliary fuel (liquefied gas, Sweet natural gas or oil fuel) burning, ensure that combustor exit is not less than 1000 ℃.The charcoal that pyrolysis produces detects according to standard HJ-T/300, detect leaching concentration Cd lower than 0.1ppm, Cu is lower than 0.30ppm, and the leaching concentration of Be is not higher than 0.05ppm, Poly Brominated Diphenyl Ethers PBDEs detected value is 1.1ng/kg, can send into sanitary filling field landfill or as overburden soil.
Embodiment 6
The butt calorific value of certain city's sewage sludge is 14300KJ/kg, moisture 72%, and each heavy metal species self containing is all not high.Separately have one containing nickel, copper Cu, smeltery's mud of barium Ba and silver-colored Ag, moisture 40%, without calorific value.Containing Ni, reach 5000ppm, Cu reaches 7000ppm, and Ba reaches 2400ppm, and Ag reaches 450ppm, is butt concentration.While adopting the technology of the present invention to dispose, according to the ratio of 100:25, the malaxation device pugging mullering by twin shaft kncading machine form mixes Jiang Gai smeltery mud with sewage sludge, forms particle, and the butt calorific value of mixture is 9311kJ/kg.Particle is sent into the belt dryer of direct contact, and then dried mixture is sent into pyrolyzer, and pyrolyzer adopts the helical feed formula pyrolyzer of Three-section type heating, and there is the heating of flue gas sleeve pipe in outside.The pyrolysis temperature of final stage maintains between 650 ~ 750 ℃, after volatile matter approximately 1/3 that pyrolysis produces is cooling, send into gas-holder, approximately 2/3 volatile matter directly imports combustion chambers burn, drops into auxiliary fuel (liquefied gas, Sweet natural gas, oil fuel) burning when 1100 ℃ of combustor exit flue-gas temperature less thaies.High-temperature flue gas is sent into moisture eliminator and is directly contacted with mixture after lowering the temperature in pyrolyzer, the waste gas of generation is sent into refining plant; The charcoal that pyrolysis produces detects according to standard HJ-T/300, detects leaching concentration Cu lower than 0.46ppm, and Ni is lower than 0.38ppm, and Ba is lower than 0.23ppm, and Ag is lower than 0.024ppm.At flue gas denitrification system, can be used as denitrating catalyst, at 400 ℃ with NH
3for reductive agent, NH
3with the amount ratio of NOx be 1.2 o'clock, denitration efficiency reaches more than 90%; Discarded catalyzer still can be sent into the independent landfill of sanitary filling field or as overburden soil.
Above-described embodiment has been shown the present invention's adoptable Implementation Modes in actual applications.But the present invention comprises and anyly processes and stablize the process containing heavy metal contaminants by pyrolyzing sludge process.When substantive benefit of the present invention is lignin-sludge, can process the pollutent that other contains heavy metal, no matter the latter has or not calorific value and whether contains other pollutent simultaneously.
Claims (8)
1. utilize a method for pyrolyzing sludge stabilizing heavy metal, it is characterized in that concrete steps are as follows:
The dewatered sludge of water ratio 0% ~ 80% enters malaxation device (1), evenly mixes with the Hazardous wastes that contains heavy metal to be processed, and after mixing, the butt calorific value of material is not less than 9000kJ/kg; The mud that is mixed with the Hazardous wastes that contains heavy metal is sent into moisture eliminator (2), utilize thermal source dry mixed material (3), when mixture water ratio is during lower than (10) %, send into pyrolyzer (4), in pyrolyzer (4), carry out pyrolysis and produce volatiles (5) and pyrolytic carbon (10); Controlling pyrolysis temperature is 350 ~ 750 ℃, and it is cooling that the pyrolytic carbon of high temperature (10) is sent into water cooler (11), and cooled charcoal is delivered to final processing links sanitary filling field and even done catalyst recycle; Volatiles (5) is divided into two strands and flows through delivery chamber, one volatiles (5) is sent into gas-holder (6) after cooling chamber (16), the inflammable gas of gas-holder (6) is sent into the combustor air inlet pipe being arranged in combustion chamber (6) after by pressure regulating device, as the steady combustion gas body of combustion chamber (6), guarantee that another strand of volatiles directly send without cooling the stable burning of catching fire immediately behind combustion chamber to; Another strand of volatiles directly delivered to combustion chamber (7); The phlegma producing in the phlegma of gas-holder (6) bottom and process of cooling is sent into pyrolyzer (4) again and is carried out second pyrolysis; The heating surface heat source side that the high-temperature flue gas (8) that combustion chamber (7) produces is sent pyrolyzer (4) back to provides pyrolysis required heat as thermal source; Flue gas after desuperheat (9) is sent into moisture eliminator (2) mixing sludge is dried subsequently; The dry waste gas producing and cooled flue gas respectively or a synthetic plume send into after gas purifier (13) purifies and discharge.
2. method according to claim 1, is characterized in that described pyrolysis temperature is 450 ~ 650 ℃.
3. method according to claim 1, contains the Hazardous wastes of heavy metal for containing mud, residue or the soil of cadmium, lead, zinc, chromium, nickel, copper, selenium, manganese, beryllium, barium or silver one or more metals wherein described in it is characterized in that; Or the flying dust of castoff burning generation.
4. the device that the method for utilizing pyrolyzing sludge stabilizing heavy metal as claimed in claim 1 is used, it is characterized in that comprising malaxation device (1), moisture eliminator (2), pyrolyzer (4), gas-holder (6), combustion chamber (7), water cooler (11), cooling chamber (16) and gas pressure regulating and check device (16), wherein: the outlet of malaxation device (1) connects moisture eliminator (2), the mixture outlet of moisture eliminator (2) connects pyrolyzer (4), the gas approach of moisture eliminator (2) connects pyrolyzer (4), the volatiles of pyrolyzer (4) is leaded up to cooling chamber (16) and is connected gas-holder (6), the volatiles of pyrolyzer (4) is separately leaded up to pipeline and is connected combustion chamber (7), the pyrolytic carbon outlet of pyrolyzer (4) connects water cooler (11), and gas-holder (6) is connected combustion chamber (7) by gas pressure regulating with check device (17) with pipeline, moisture eliminator (2) connects gas purifier (13).
5. device according to claim 4, is characterized in that malaxation device (1) adopts the container with agitator, import and outlet; Or the helical feed kncading machine with one or one above screw shaft.
6. device according to claim 4, it is characterized in that described moisture eliminator (2) in vacuum blade dryer, capstan moisture eliminator, rotary-drum drier, belt dryer or fluidized bed dryer any.
7. device according to claim 4, is characterized in that being furnished with the cooling coil that can collect phlegma in cooling chamber (16), and cooling coil inside is cold water or cold wind.
8. device according to claim 4, it is characterized in that pyrolyzer (4) in positive displacement, tubular type or rotary kiln type any, and have 2 volatile matters outlet connecting passages at least.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104100980A (en) * | 2014-07-01 | 2014-10-15 | 同济大学 | Small garbage coking combustion furnace |
| CN104261646A (en) * | 2014-08-18 | 2015-01-07 | 四川大学 | Form transformation control process for chromium (Cr) in thermal treatment process of tannery sludge |
| CN104944732A (en) * | 2015-06-29 | 2015-09-30 | 同济大学 | Energy-saving recycling treatment disposal system and energy-saving recycling treatment disposal process for organic solid waste |
| CN105217914A (en) * | 2015-09-23 | 2016-01-06 | 同济大学 | Based on the method for molysite additive pyrolysis mud parcel stabilizing fly ash heavy metal |
| CN105333441A (en) * | 2015-10-21 | 2016-02-17 | 北京神雾环境能源科技集团股份有限公司 | Garbage disposal method and garbage dry distillation furnace |
| CN106380057A (en) * | 2016-11-07 | 2017-02-08 | 西安航天源动力工程有限公司 | Low-energy-consumption and low-emission sludge drying and carbonization device |
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| CN108911456A (en) * | 2018-08-07 | 2018-11-30 | 李明泽 | A kind of new process for treating oil-containing sludge and system |
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| CN111592112A (en) * | 2020-05-28 | 2020-08-28 | 盐城工学院 | Method for remediation and recycling of organic pollution by mudflat plants |
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| CN112601799A (en) * | 2018-05-04 | 2021-04-02 | 新加坡国立大学 | Method and system for heavy metal immobilization |
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| CN104100980A (en) * | 2014-07-01 | 2014-10-15 | 同济大学 | Small garbage coking combustion furnace |
| CN104261646A (en) * | 2014-08-18 | 2015-01-07 | 四川大学 | Form transformation control process for chromium (Cr) in thermal treatment process of tannery sludge |
| CN104261646B (en) * | 2014-08-18 | 2016-08-17 | 四川大学 | In a kind of leather-making mud heat treatment process, the Formregelung of chromium converts and controls technique |
| CN104944732A (en) * | 2015-06-29 | 2015-09-30 | 同济大学 | Energy-saving recycling treatment disposal system and energy-saving recycling treatment disposal process for organic solid waste |
| CN105217914B (en) * | 2015-09-23 | 2018-02-09 | 同济大学 | Method based on molysite additive pyrolysis sludge parcel stabilizing fly ash heavy metal |
| CN105217914A (en) * | 2015-09-23 | 2016-01-06 | 同济大学 | Based on the method for molysite additive pyrolysis mud parcel stabilizing fly ash heavy metal |
| CN105333441B (en) * | 2015-10-21 | 2018-03-23 | 神雾科技集团股份有限公司 | A kind of waste disposal method and rubbish gas retort |
| CN105333441A (en) * | 2015-10-21 | 2016-02-17 | 北京神雾环境能源科技集团股份有限公司 | Garbage disposal method and garbage dry distillation furnace |
| CN109563991A (en) * | 2016-07-28 | 2019-04-02 | 弗罗拉德瑞有限公司 | Fractional combustion |
| CN106380057A (en) * | 2016-11-07 | 2017-02-08 | 西安航天源动力工程有限公司 | Low-energy-consumption and low-emission sludge drying and carbonization device |
| CN106380057B (en) * | 2016-11-07 | 2023-10-13 | 西安航天源动力工程有限公司 | Low energy consumption low emission sludge drying carbonization device |
| CN108796209A (en) * | 2017-04-26 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of processing of grinding roller sludge and utilize method |
| CN112601799A (en) * | 2018-05-04 | 2021-04-02 | 新加坡国立大学 | Method and system for heavy metal immobilization |
| CN108911456A (en) * | 2018-08-07 | 2018-11-30 | 李明泽 | A kind of new process for treating oil-containing sludge and system |
| CN108911456B (en) * | 2018-08-07 | 2021-11-05 | 李明泽 | Novel oily sludge treatment method and system |
| CN110092559A (en) * | 2019-04-10 | 2019-08-06 | 浙江清风源环保科技有限公司 | A kind of processing method of sludge containing heavy metal |
| CN111592112A (en) * | 2020-05-28 | 2020-08-28 | 盐城工学院 | Method for remediation and recycling of organic pollution by mudflat plants |
| CN111735062A (en) * | 2020-06-29 | 2020-10-02 | 中国科学院过程工程研究所 | Low-pollution-emission sludge resource incineration method and system device |
| CN111735062B (en) * | 2020-06-29 | 2021-11-16 | 中国科学院过程工程研究所 | Low-pollution-emission sludge resource incineration method and system device |
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