CN109337727A - Derived from sludge fuel process and product based on carbon skeleton auxiliary pyrohydrolysis - Google Patents
Derived from sludge fuel process and product based on carbon skeleton auxiliary pyrohydrolysis Download PDFInfo
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- CN109337727A CN109337727A CN201811256039.4A CN201811256039A CN109337727A CN 109337727 A CN109337727 A CN 109337727A CN 201811256039 A CN201811256039 A CN 201811256039A CN 109337727 A CN109337727 A CN 109337727A
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- sludge
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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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- 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
Abstract
The invention belongs to Treatment of Sludge correlative technology fields, and specifically disclose a kind of derived from sludge fuel process and product based on carbon skeleton auxiliary pyrohydrolysis.This method specifically: add carbon skeleton into pulp sludge and obtain carburetting sludge, mechanical dehydration obtains dewatered sludge after then carrying out pyrohydrolysis to it, finally carries out heat drying or natural desiccation obtains derived from sludge fuel.The present invention greatly improves the dewatering and desiccation performance of sludge by the way that carbon skeleton is added, and the derived from sludge fuel energy density obtained is made to get a promotion, the stability enhancing of burning；And pyrohydrolysis process reduces fuel alkali metal, sulphur, nitrogen, content of Cl element, improves the stability of heavy metal, so that reducing secondary pollution risk and furnace internal heating surface in energy sources conversion stains corrosion risk；In addition, the present invention is sufficiently recycled by the heat to pyrohydrolysis mud and filter liquor, reach energy saving target while improving capacity usage ratio.
Description
Technical field
The invention belongs to Treatment of Sludge correlative technology fields, assist hot water based on carbon skeleton more particularly, to one kind
The derived from sludge fuel process and product of solution.
Background technique
Sludge is the remaining solid waste generated after sewage treatment, moisture content it is high and rich in oxysulfide, again
The poisonous and harmful substances such as metal ion, pathogen, it is very big to environmental hazard.With the development of social productive forces, China's sludge year
Yield increases year by year, and stabilisation, minimizing and the harmless treatment of sludge have become instantly popular environmental problem.But sludge
High-moisture percentage be that and traditional mechanical dehydration mode can only drop moisture percentage in sewage sludge an important factor for limiting its resource utilization
To 75%~85%, function and effect are extremely limited and treatment effeciency is lower.This is primarily due to the microorganism secretion in sludge
Extracellular polymeric (EPS) makes sludge that organic flocculation structure be presented, and has extremely strong hydrophily and package action；Furthermore in sludge
Organic matter and colloidal content are high, so that its solid structure is had the compressibility of height, make in mechanical sludge dewatering compression process
At the blocking in moisture filter channel, so that sludge filtrability reduces, to inhibit the separation of solid and liquid in sludge.
Some solutions are had been proposed for sludge drying processing technique in the prior art.For example,
CN201611117165.2 disclose one kind can continuous deep dehydration cooperating with low-temperature sludge drying system, but the system is not preceding
End pre-processes sludge, therefore the physicochemical property for handling preceding sludge does not obtain conditioning optimization, does so as to cause entire dehydration
It is not high to change process efficiency；CN201510818726.0 discloses a kind of sludge combined cooker method, by centainly sequentially to add
KMnO4、FeCl3The dewatering of sludge is improved with charcoal, but the conditioning effect of this method is to be improved, and adds
Entering inorganic substances reduces the calorific value of sludge, and furthermore the addition of villaumite also increases dioxin during alternative energyization utilizes
The risk of generation and boiler heating surface corrosion.
In emerging sludge disposal technology, hydro-thermal method attracts attention because reaction efficiency is high, low energy consumption.
CN201110279705.8 discloses a kind of sludge treatment technique based on hydrothermal modification technology, by the sludge after mechanical dehydration
Mechanical dehydration is being carried out after carrying out pulp, hydro-thermal process, but is being dehydrated repeatedly in the invention, adds the process procedures of water slurry superfluous
Numerous, energy consumption is excessively high, and the product organic matter loss after hydro-thermal process seriously causes product calorific value low, is unfavorable for alternative energyization benefit
With；CN201611104585.7 discloses a kind of urban sludge treating method based on hydrothermal carbonization, and sludge is preheated, hydro-thermal carbon
Dewatered sludge particle is made after the series of processing steps such as change, cooling, mechanical dehydration, depth desiccation, added value of product is high, however water
Hot temperature is up to 190-320 DEG C, and pressure is up to 10-17MPa, and 16-22 hours time-consuming, reaction condition is more harsh, and is dehydrated and produces
Raw filtrate COD (COD) content is high, does not obtain appropriate disposition and utilization, easily causes secondary pollution, hydro-thermal
Treated, and waste heat is not also recycled, and capacity usage ratio is not high；CN201710151693 discloses a kind of hydrothermal carbonization processing
The concentrated sulfuric acid is added before entering reactor by addition sludge in the method that sludge prepares fuel, carries out in reaction partway to reaction
In device be added concentrated nitric acid prepare sludge solid fuel, so obtained from sludge product calorific value it is low, and method require acid condition
Big to equipment corrosion, dewatered acid filtrate is difficult to handle.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides one kind assists hot water based on carbon skeleton
The derived from sludge fuel process and product of solution, this method are de- by pyrohydrolysis and machinery using carbon skeleton as conditioner
The technique of water carries out desiccation to sludge, to obtain derived from sludge fuel, the dehydration of sludge is promoted while improving treatment effeciency
Performance and desiccation performance are therefore particularly suitable for sludge drying processing to obtain the preferable derived from sludge fuel of combustion characteristics
Application.
To achieve the above object, according to one aspect of the present invention, it proposes a kind of based on carbon skeleton auxiliary pyrohydrolysis
Derived from sludge fuel process, which is characterized in that this method comprises the following steps:
(I) adds carbon skeleton into pulp sludge as conditioner, obtains carburetting sludge；
(II) carries out pyrohydrolysis to carburetting sludge obtained in step (I), obtains pyrohydrolysis mud；
(III) carries out mechanical dehydration to pyrohydrolysis mud obtained in step (II), dewatered sludge is obtained, when dehydration obtained
When moisture percentage in sewage sludge is higher than 20%, heat drying is carried out to it or natural desiccation obtains derived from sludge fuel；When the dewatered sludge contains
When water rate is lower than 20%, derived from sludge fuel is directly obtained.
As it is further preferred that the mass ratio of butt and moisture is preferably 1:4~1 in the step (I) pulp sludge:
32, and further preferably 1:8~1:25.
As it is further preferred that carbon skeleton includes lignite, mud coal, sawdust, stalk, rice husk, jade in the step (I)
The crushed particles of any one or a few in meter Xin, bagasse or shrimp and crab shells；The partial size of the carbon skeleton be preferably 0.06mm~
5mm。
As it is further preferred that carbon skeleton and the mass ratio of butt in pulp sludge are preferably in the step (I)
1:2~1:20, and further preferably 1:4~1:15.
As it is further preferred that the heating method of pyrohydrolysis preferably uses electric heating or high pressure to steam in the step (II)
Vapour is rapidly heated, and the handling duration of pyrohydrolysis is preferably 0.5min~60min, and the reaction temperature of pyrohydrolysis is preferably 80 DEG C~
240 DEG C, the reaction pressure of pyrohydrolysis is preferably 0.1MPa~25MPa.
As it is further preferred that in the step (III) preferably using plate and frame filter press, autoclave diaphragm formula filter press or
Belt filter press carries out mechanical dehydration, and the feeding temperature of the pyrohydrolysis mud is preferably 40 DEG C~90 DEG C, and dewatering pressure is preferably
0.2MPa~20MPa.
As it is further preferred that the direct heat source of heat drying preferably uses hot-air, waste heat to steam in the step (III)
Vapour or flue gas, indirect heat source preferably use in the step (II) mechanical dehydration in pyrohydrolysis mud obtained or the step (III)
Obtained filter liquor, the temperature of heat drying are preferably 40 DEG C~240 DEG C, and the time of heat drying is preferably 10min~180min；Institute
The temperature for stating natural desiccation in step (III) is preferably 20 DEG C~50 DEG C, and the time of natural desiccation is preferably 12h~72h.
As it is further preferred that the filter liquor that mechanical dehydration obtains in the step (III) is first used as the indirect heat source of desiccation
Heat recovery is carried out, later back to the main biochemical treatment unit in sewage treatment plant.
It is another aspect of this invention to provide that providing a kind of derived from sludge fuel prepared using the above method.
As it is further preferred that the dry base heat value of the derived from sludge fuel is preferably 8MJ/kg~15MJ/kg, kindling
Point is preferably 500K~550K, and Burn-out temperature is preferably 800K~950K.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, mainly have below
Technological merit:
1. the present invention greatly improves the dewatering of sludge by the way that carbon skeleton is added, so that sludge is in pyrohydrolysis mistake
Cell rupture in journey, EPS degradation, the combination water of cell interior are largely released；Carbon skeleton and sludge occur simultaneously
Coupling can further discharge the moisture in sludge, change mud granule property, optimize the flocculating properties of sludge, reduce muddy water
Separating difficulty；Furthermore pyrohydrolysis reaction occurs for carbon skeleton itself, and small organic molecule decomposes dissolution, and organic macromolecule part is disconnected
It splits, releases gas molecule, to form the skeleton with even porous structure, moisture evolution is supported during dehydration
Channel, so that mud cake is become more loose porous, moisture resistance to outflow is smaller；
2. simultaneously, the addition of carbon skeleton effectively increases the desiccation performance of sludge, dirty when carbon skeleton assists pyrohydrolysis
Pyrohydrolysis reaction occurs for mud and carbon skeleton, makes to form the gap uniformly and extended in all direction inside hydro-thermal solid product, compares table
Area increases, gap structure advanced optimizes, so that the resistance of water release becomes smaller in drying process, desiccation rate is promoted；Together
When sludge cohesion stress and bond stress reduce, heating conduction improve, alleviate adhesion of the sludge on desiccation machine heat-transfer area
Problem guarantees that diabatic process expeditiously carries out；
3. especially, being obtained greatly using product, that is, derived from sludge fuel ignition quality that preparation method of the invention obtains
Width is promoted, and during carbon skeleton assists pyrohydrolysis, sludge reacts removing by decarboxylation etc. with part H and O in carbon skeleton,
So that the atomic ratio of C/H and C/O increases, while C increases with the progress of carburizing reagent, makes derived from sludge fuel energy density
It gets a promotion；Meanwhile in pyrohydrolysis process small organic molecule dissolution so that derived from sludge fuel was discharged in 425K~625K
Volatile matter is reduced, and alleviates deflagration phenomenon, improves the stability of its burning；And since pyrohydrolysis has stabilisation to heavy metal
Effect reduces heavy metal in combustion process so that heavy metal is converted into safer stable state form in derived from sludge fuel
Release；Furthermore the element portions such as alkali metal, sulphur, nitrogen, chlorine dissolve out in pyrohydrolysis process, alkali metal in derived from sludge fuel,
The constituent contents such as sulphur, nitrogen, chlorine reduce, and pollution gas release is reduced when burning, and boiler Slagging and boiler flue corrosion wind
Danger is also corresponding to reduce；
4. improving capacity usage ratio in addition, the present invention is sufficiently recycled by the heat to pyrohydrolysis mud and filter liquor
While reach energy saving target；And feeding temperature is higher when using mechanical dehydration, be more advantageous to dehydration into
The filter liquor of row, acquisition returns to main biochemical treatment unit, reduces pollutant emission, and can provide for denitrification dephosphorization technique additionally
Carbon source realizes the simplification of production line and the promotion for the treatment of effeciency while to avoid secondary pollution.
Detailed description of the invention
Fig. 1 is the process flow chart proposed by the present invention that derived from sludge fuel is prepared based on carbon skeleton auxiliary pyrohydrolysis.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, the invention proposes a kind of derived from sludge preparation of fuel sides based on carbon skeleton auxiliary pyrohydrolysis
Method, which is characterized in that this method comprises the following steps:
(I) adds carbon skeleton into pulp sludge as conditioner, obtains carburetting sludge；
(II) carries out pyrohydrolysis to carburetting sludge obtained in step (I), obtains pyrohydrolysis mud；
(III) carries out mechanical dehydration to pyrohydrolysis mud obtained in step (II), dewatered sludge is obtained, when dehydration obtained
When moisture percentage in sewage sludge is higher than 20%, heat drying is carried out to it or natural desiccation obtains derived from sludge fuel；When the dewatered sludge contains
When water rate is lower than 20%, derived from sludge fuel is directly obtained.
Further, the mass ratio of butt and moisture is preferably 1:4~1:32 in pulp sludge in the step (I), is gone forward side by side
One step is preferably 1:8~1:25；
More specifically, in pulp sludge solid-to-liquid ratio it is excessively high will lead to water-heat process carry out it is insufficient not exclusively, to reduce
Treatment effect, and too low solid-to-liquid ratio can make pending mud amount be multiplied, so that processing energy consumption and time increase, therefore need
Economic benefit, time cost and the treatment effect for comprehensively considering technique are chosen or are prepared；The pulp sludge can be by dense
The sludge that moisture content is 75%~85% after moisture content is 95%~99% in contracting pond excess sludge and mechanical dehydration is by certain
Ratio mixing pulp obtains, and can also directly adopt the excess sludge that moisture content is 95%~97%.
Further, carbon skeleton includes lignite, mud coal, sawdust, stalk, rice husk, corncob, sugarcane in the step (I)
The crushed particles of any one or a few in slag or shrimp and crab shells；The partial size of the carbon skeleton is preferably 0.06mm~5mm；
More specifically, selecting natural carbon skeleton that can generate unfavorable shadow to sludge later use to avoid chemical addition agent
It rings, while guaranteeing that carbon skeleton particle is more obvious to the booster action of pyrohydrolysis, it should carbon-based when avoiding mechanical dehydration
Skeleton particle is meticulous to block filter moisture channel, it is therefore desirable to carry out strict control to the partial size of carbon skeleton.
Further, carbon skeleton and the mass ratio of butt in pulp sludge are preferably 1:2~1:20 in the step (I),
And further preferably 1:4~1:15, lower manufacturing cost while to guarantee treatment effeciency.
Further, the heating method of pyrohydrolysis preferably uses electric heating or high steam quickly to rise in the step (II)
Temperature, the handling duration of pyrohydrolysis are preferably 0.5min~60min, and the reaction temperature of pyrohydrolysis is preferably 80 DEG C~240 DEG C, hot water
The reaction pressure of solution is preferably 0.1MPa~25MPa.
Further, plate and frame filter press, autoclave diaphragm formula filter press or belt filter press are preferably used in the step (III)
Carry out mechanical dehydration, the feeding temperature of the pyrohydrolysis mud is preferably 40 DEG C~90 DEG C, dewatering pressure be preferably 0.2MPa~
20MPa。
Further, the direct heat source of heat drying preferably uses hot-air, waste hot steam or flue gas in the step (III),
Connecing heat source preferably uses what mechanical dehydration in pyrohydrolysis mud obtained in the step (II) or the step (III) obtained to filter out
Liquid, the temperature of heat drying are preferably 40 DEG C~240 DEG C, and the time of heat drying is preferably 10min~180min；The step (III)
The temperature of middle nature desiccation is preferably 20 DEG C~50 DEG C, and the time of natural desiccation is preferably 12h~72h.
Further, the filter liquor that mechanical dehydration obtains in the step (III) is first used as the indirect heat source of heat drying to carry out heat
Amount recycling provides Additional carbon sources later back to the main biochemical treatment unit in sewage treatment plant for denitrification dephosphorization technique.
The dry base heat value of the derived from sludge fuel prepared according to the method described above is preferably 8MJ/kg~15MJ/kg, ignition point
Preferably 500K~550K, Burn-out temperature are preferably 800K~950K.
Now by taking the derived from sludge fuel process and product specifically based on carbon skeleton auxiliary pyrohydrolysis as an example, to this
Invention is further elaborated.
Embodiment 1
(a) moisture content is 80.0% after sewage treatment plant's mechanical dehydration dewatered sludge is directlyed adopt as pulp sludge,
The mass ratio for obtaining butt and moisture is the pulp sludge of 1:4；
(b) stalk powder for crushing and filtering out partial size by pulverizer as 2mm~5mm is chosen as carbon skeleton, is incited somebody to action
Butt adds this carbon skeleton into pulp sludge with the mass ratio of 1:10 in carbon skeleton and pulp sludge, and in agitator tank
It stirs evenly, obtains carburetting sludge, measuring its moisture content is 78.5%；
(c) the carburetting sludge prepared in above-mentioned steps (b) is pumped by electric heating autoclave hydro-thermal reaction by screw feeder
In device, reaction temperature is set as 180 DEG C, soaking time 20min, initial reaction pressure is local atmospheric pressure, in reaction process
Maximum pressure is the saturated vapor pressure under corresponding temperature, finally obtains pyrohydrolysis mud；
(d) the pyrohydrolysis mud of fully reacting in above-mentioned steps (c) is imported drying machine to exchange heat, is reduced to 90 to temperature
DEG C when import belt filter press in, filter-press dehydration, isolated filter liquor and dewatered sludge are carried out under 0.2MPa pressure, wherein
Filter liquor returns to sewage treatment factory owner biochemical treatment unit, provides volume for denitrification dephosphorization technique after having carried out heat recovery
Outer carbon source, and the moisture content for measuring the dewatered sludge is 39.8%；
(e) it as desiccation in drying machine after collecting dewatered sludge obtained in above-mentioned steps (d), sets a length of when desiccation
10min, the waste heat flue gas that the direct heat source of desiccation is 200 DEG C, the indirect heat source of desiccation are pyrohydrolysis mud and step in step (c)
Suddenly the filter liquor in (d) finally obtains derived from sludge fuel, and the moisture content for measuring the derived from sludge fuel is 18.3%, butt
Calorific value 10.35MJ/kg, ignition point 524K, Burn-out temperature 856K.
Embodiment 2
(a) it takes the excess sludge that moisture content is 97.0% directly as pulp sludge in sewage treatment plant's concentration basin, obtains
The pulp sludge for being 1:32 to the mass ratio of butt and moisture；
(b) choose crushes and filters out by pulverizer partial size for 0.5mm~2mm lignite powder as carbon skeleton,
Butt in carbon skeleton and pulp sludge is added into this carbon skeleton into pulp sludge with the mass ratio of 1:20, and in agitator tank
In stir evenly, obtain carburetting sludge, measure its moisture content be 96.9%；
(c) the carburetting sludge prepared in above-mentioned steps (b) is pumped into steam reaction kettle by screw pump and pipeline, Xiang Qi
The middle high steam for importing temperature and being 240 DEG C, the reaction time of pyrohydrolysis is 0.5min, and the reaction average pressure of pyrohydrolysis is
13MPa finally obtains pyrohydrolysis mud；
(d) the pyrohydrolysis mud of fully reacting in above-mentioned steps (c) is imported drying machine to exchange heat, is reduced to 60 to temperature
DEG C when import in autoclave diaphragm formula filter press, high pressure filter-press dehydration, isolated filter liquor and dehydration are carried out under 10MPa pressure
Sludge, wherein filter liquor returns to sewage treatment factory owner biochemical treatment unit after having carried out heat recovery, is denitrogenation dephosphorizing work
Skill provides Additional carbon sources, and the moisture content for measuring the dewatered sludge is 31.2%；
(e) it as desiccation in drying machine after collecting dewatered sludge obtained in above-mentioned steps (d), sets a length of when desiccation
180min, the hot-air that the direct heat source of desiccation is 80 DEG C, the indirect heat source of desiccation are pyrohydrolysis mud and step in step (c)
(d) filter liquor in finally obtains derived from sludge fuel, and the moisture content for measuring the derived from sludge fuel is 5.6%, dry base heat value
11.92MJ/kg, ignition point 540K, Burn-out temperature 923K.
Embodiment 3
(a) it is 98.7% excess sludge that moisture content is taken in sewage treatment plant's concentration basin, and is taken after mechanical dehydration
The dewatered sludge that moisture content is 78.6%, according to excess sludge mass fraction 80.3%, dewatered sludge mass fraction 19.7%
Ratio mixing imports in agitator tank, carries out mixing pulp, and the mass ratio for obtaining butt and moisture is the pulp sludge of 1:18；
(b) choose crushes and filters out by pulverizer partial size for 0.065mm~0.5mm sawdust as carbon skeleton,
Butt in carbon skeleton and pulp sludge is added into this carbon skeleton into pulp sludge with the mass ratio of 1:2, and in agitator tank
In stir evenly, obtain carburetting sludge, measure its moisture content be 92.8%；
(c) the carburetting sludge prepared in above-mentioned steps (b) is pumped into steam reaction kettle by screw pump and pipeline, Xiang Qi
The middle high steam for importing temperature and being 200 DEG C, the reaction time of pyrohydrolysis is 2min, and the reaction average pressure of pyrohydrolysis is
10MPa finally obtains pyrohydrolysis mud；
(d) the pyrohydrolysis mud of fully reacting in above-mentioned steps (c) is imported drying machine to exchange heat, is reduced to 40 to temperature
DEG C when import in autoclave diaphragm formula filter press, high pressure filter-press dehydration, isolated filter liquor and dehydration are carried out under 20MPa pressure
Sludge, wherein filter liquor returns to sewage treatment factory owner biochemical treatment unit after having carried out heat recovery, is denitrogenation dephosphorizing work
Skill provides Additional carbon sources, and the moisture content for measuring the dewatered sludge is 24.6%；
(e) by dewatered sludge obtained in above-mentioned steps (d) collect after as in drying machine by the way of nature desiccation
Desiccation is carried out, a length of 48h when desiccation is set, finally obtains derived from sludge fuel, the moisture content for measuring the derived from sludge fuel is
16.5%, dry base heat value 14.46MJ/kg, ignition point 509K, Burn-out temperature 827K.
Embodiment 4
(a) it is 96.9% excess sludge that moisture content is taken in sewage treatment plant's concentration basin, and is taken after mechanical dehydration
The dewatered sludge that moisture content is 81.6%, according to excess sludge mass fraction 47.6%, dewatered sludge mass fraction 52.4%
Ratio mixing imports in agitator tank, carries out mixing pulp, and the mass ratio for obtaining butt and moisture is the pulp sludge of 1:8；
(b) choosing and crushing and filter out mud coal powder that partial size is 0.1mm~1mm and partial size by pulverizer is 0.2mm
The shrimp and crab shells powder of~0.4mm obtains carbon skeleton with the mixing of the mass ratio of 1:3, by butt in carbon skeleton and pulp sludge with
The mass ratio of 1:4 adds this carbon skeleton and stirs evenly into pulp sludge, and in agitator tank, obtains carburetting sludge, measures
Its moisture content is 86.6%；
(c) that the carburetting sludge prepared in above-mentioned steps (b) is pumped into electric heating autoclave hydro-thermal by screw pump and pipeline is anti-
It answers in device, sets reaction temperature as 120 DEG C, soaking time 40min, the reaction average pressure of pyrohydrolysis is 5MPa, final
To pyrohydrolysis mud；
(d) the pyrohydrolysis mud of fully reacting in above-mentioned steps (c) is imported drying machine to exchange heat, is reduced to 40 to temperature
DEG C when import in autoclave diaphragm formula filter press, high pressure filter-press dehydration, isolated filter liquor and dehydration are carried out under 5MPa pressure
Sludge, wherein filter liquor returns to sewage treatment factory owner biochemical treatment unit after having carried out heat recovery, is denitrogenation dephosphorizing work
Skill provides Additional carbon sources, and the moisture content for measuring the dewatered sludge is 37.5%；
(e) as carrying out desiccation in drying machine after collecting dewatered sludge obtained in above-mentioned steps (d), when setting desiccation
A length of 40min, the hot-air that the direct heat source of desiccation is 150 DEG C, the indirect heat source of desiccation be pyrohydrolysis mud in step (c) and
Filter liquor in step (d) finally obtains derived from sludge fuel, and the moisture content for measuring the derived from sludge fuel is 14.5%, does
Base calorific value 12.38MJ/kg, ignition point 517K, Burn-out temperature 896K.
Embodiment 5
(a) it is 97.5% excess sludge that moisture content is taken in sewage treatment plant's concentration basin, and is taken after mechanical dehydration
The dewatered sludge that moisture content is 79.2%, according to excess sludge mass fraction 92.6%, the ratio of dewatered sludge mass fraction 7.4%
Example mixing imports in agitator tank, carries out mixing pulp, and the mass ratio for obtaining butt and moisture is the pulp sludge of 1:25；
(b) peanut shell for crushing and filtering out partial size by pulverizer as 0.5mm~2mm is chosen as carbon skeleton, is incited somebody to action
Butt adds this carbon skeleton into pulp sludge with the mass ratio of 1:15 in carbon skeleton and pulp sludge, and in agitator tank
It stirs evenly, obtains carburetting sludge, measuring its moisture content is 96.2%；
(c) that the carburetting sludge prepared in above-mentioned steps (b) is pumped into electric heating autoclave hydro-thermal by screw pump and pipeline is anti-
It answers in device, sets reaction temperature as 80 DEG C, soaking time 60min, the reaction average pressure of pyrohydrolysis is 6MPa, is finally obtained
Pyrohydrolysis mud；
(d) the pyrohydrolysis mud of fully reacting in above-mentioned steps (c) is imported drying machine to exchange heat, is reduced to 40 to temperature
DEG C when import in high pressure plate and frame filter press, high pressure filter-press dehydration, isolated filter liquor and dehydration are carried out under 2.4MPa pressure
Sludge, wherein filter liquor returns to sewage treatment factory owner biochemical treatment unit after having carried out heat recovery, is denitrogenation dephosphorizing work
Skill provides Additional carbon sources, and the moisture content for measuring the dewatered sludge is 48.7%；
(e) as carrying out desiccation in drying machine after collecting dewatered sludge obtained in above-mentioned steps (d), when setting desiccation
A length of 120min, the hot-air that the direct heat source of desiccation is 70 DEG C, the indirect heat source of desiccation be pyrohydrolysis mud in step (c) and
Filter liquor in step (d) finally obtains derived from sludge fuel, and the moisture content for measuring the derived from sludge fuel is 25.5%, does
Base calorific value 9.79MJ/kg, ignition point 518K, Burn-out temperature 867K.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. the derived from sludge fuel process based on carbon skeleton auxiliary pyrohydrolysis, which is characterized in that this method includes as follows
Step:
(I) adds carbon skeleton into pulp sludge as conditioner, obtains carburetting sludge；
(II) carries out pyrohydrolysis to carburetting sludge obtained in step (I), obtains pyrohydrolysis mud；
(III) carries out mechanical dehydration to pyrohydrolysis mud obtained in step (II), dewatered sludge is obtained, when dewatered sludge obtained
When moisture content is higher than 20%, heat drying is carried out to it or natural desiccation obtains derived from sludge fuel；When the dewatered sludge moisture content
When lower than 20%, derived from sludge fuel is directly obtained.
2. the derived from sludge fuel process as described in claim 1 based on carbon skeleton auxiliary pyrohydrolysis, feature exist
In the mass ratio of butt and moisture is 1:4~1:32 in step (I) the pulp sludge, and further preferably 1:8~1:
25。
3. the derived from sludge fuel process as claimed in claim 1 or 2 based on carbon skeleton auxiliary pyrohydrolysis, feature
It is, carbon skeleton includes lignite, mud coal, sawdust, stalk, rice husk, corncob, bagasse or shrimp and crab shells in the step (I)
In any one or a few crushed particles；The partial size of the carbon skeleton is preferably 0.06mm~5mm.
4. the derived from sludge preparation of fuel side based on carbon skeleton auxiliary pyrohydrolysis as described in claims 1 to 3 any one
Method, which is characterized in that the mass ratio of butt is 1:2~1:20 in carbon skeleton and pulp sludge in the step (I), goes forward side by side one
Step is preferably 1:4~1:15.
5. the derived from sludge preparation of fuel side based on carbon skeleton auxiliary pyrohydrolysis as described in Claims 1 to 4 any one
Method, which is characterized in that the heating method of pyrohydrolysis preferably uses electric heating or high pressure steam heating, hot water in the step (II)
The handling duration of solution is preferably 0.5min~60min, and the reaction temperature of pyrohydrolysis is preferably 80 DEG C~240 DEG C, pyrohydrolysis it is anti-
Answering pressure is preferably 0.1MPa~25MPa.
6. the derived from sludge preparation of fuel side as claimed in any one of claims 1 to 5, wherein based on carbon skeleton auxiliary pyrohydrolysis
Method, which is characterized in that in the step (III) preferably using plate and frame filter press, autoclave diaphragm formula filter press or belt filter press into
Row mechanical dehydration, the feeding temperature of the pyrohydrolysis mud are preferably 40 DEG C~90 DEG C, dewatering pressure be preferably 0.2MPa~
20MPa。
7. the derived from sludge preparation of fuel side based on carbon skeleton auxiliary pyrohydrolysis as described in claim 1~6 any one
Method, which is characterized in that the direct heat source of heat drying preferably uses hot-air, waste hot steam or flue gas in the step (III),
Connecing heat source preferably uses what mechanical dehydration in pyrohydrolysis mud obtained in the step (II) or the step (III) obtained to filter out
Liquid, the temperature of heat drying are preferably 40 DEG C~240 DEG C, and the time of heat drying is preferably 10min~180min；The step (III)
The temperature of middle nature desiccation is preferably 20 DEG C~50 DEG C, and the time of natural desiccation is preferably 12h~72h.
8. the derived from sludge preparation of fuel side based on carbon skeleton auxiliary pyrohydrolysis as described in claim 1~7 any one
Method, which is characterized in that the filter liquor that mechanical dehydration obtains in the step (III) is first used as the indirect heat source of heat drying to carry out heat
Amount recycling, later back to the main biochemical treatment unit in sewage treatment plant.
9. a kind of derived from sludge fuel of the preparation of the method as described in claim 1~8 any one claim.
10. derived from sludge fuel as claimed in claim 9, which is characterized in that the dry base heat value of the derived from sludge fuel is excellent
It is selected as 8MJ/kg~15MJ/kg, ignition point is preferably 500K~550K, and Burn-out temperature is preferably 800K~950K.
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