CN104671628A - Sludge treatment method using solar pyrolysis carbonization technology - Google Patents
Sludge treatment method using solar pyrolysis carbonization technology Download PDFInfo
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 111
- 239000010802 sludge Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000003763 carbonization Methods 0.000 title claims abstract description 46
- 238000005516 engineering process Methods 0.000 title claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 239000010865 sewage Substances 0.000 claims abstract description 29
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 18
- 238000009834 vaporization Methods 0.000 claims abstract description 18
- 230000008016 vaporization Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 238000001035 drying Methods 0.000 claims description 46
- 238000009826 distribution Methods 0.000 claims description 41
- 239000003610 charcoal Substances 0.000 claims description 38
- 230000008569 process Effects 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 17
- 238000007906 compression Methods 0.000 claims description 11
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- 238000006297 dehydration reaction Methods 0.000 claims description 11
- 230000035484 reaction time Effects 0.000 claims description 9
- 238000005255 carburizing Methods 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
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- 238000007791 dehumidification Methods 0.000 description 48
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
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Classifications
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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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/16—Features of high-temperature carbonising processes
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge treatment method using a solar pyrolysis carbonization technology. The method comprises the following steps: adding the sludge produced by municipal sewage treatment into a pyrolysis carbonization furnace, carrying out a series of reactions, including vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonation, in a sealed, oxygen-free and non-burning state, wherein a heat source of the pyrolysis carbonization furnace is provided by a solar heat supply system, the reaction condition is high temperature and normal pressure, or high temperature and high pressure, or moderate-high temperature and high pressure, the high temperature is 500-800 DEG C, the moderate-high temperature is 200-400 DEG C and the high pressure is 1-16MPa. With the method provided by the invention, thorough treatment disposal of the sludge in a sewage plant is realized, secondary pollution is avoided, energy utilization rate is high, operation cost is very low, renewable resources is recycled, and reduction, stabilization, reutilization and resource utilization of sludge treatment disposal are really implemented completely.
Description
Technical field
The invention belongs to sludge treatment and resource recovery technical field, be specifically related to a kind of method utilizing sun power pyrolysis carbonization technical finesse mud.
Background technology
In recent years, Chinese city sewage disposal cause obtains significant progress, and is also in accelerated development process at present.But the problem that meanwhile, people are unexpected shows gradually: create a large amount of active sludge after sewage disposal.It is estimated, the mud of produce Chinese every day at present moisture 80%, weight almost accounts for 20% of city generation rubbish total amount, and annual growth is greater than 10%.According to prediction, by 2014, whole nation year produce dewatered sludge amount and will reach 2,500 ten thousand tons.Be rich in nutritive element in mud, in addition containing a large amount of a series of pollution substances such as organic matter, heavy metal, pathogenic bacteria, parasite (ovum), be easy to cause serious secondary pollution to ecotope.
The excess sludge process disposal that sewage work produces is a great problem of world today's environmental protection subject, and effectively attenuating moisture percentage in sewage sludge is a technical bottleneck in problem.At present, the mechanical dehydration mode that the sewage work of China generally adopts can by between near for moisture percentage in sewage sludge 75% ~ 80%, and regulation in " notices about strengthening the preventing and controlling of urban wastewater treatment firm sludge pollution " that general office of Chinese Ministry of Environmental Protection 2010 issues (ring is done [2010] No. 157): mud to be transported factory circle to store by sewage work for the purpose of (namely not processing disposal), must by below sludge dewatering to 50%.Water ratio excess sludge is also the secondary pollutant in sewage treatment process.On the one hand, containing a large amount of pathogenic bacterias, parasite, pathogenic microorganism in mud, and the heavy metal such as arsenic, copper, chromium, mercury is with dioxin, radionuclide etc. are difficult to the hazardous and noxious substances of degrading, because moisture percentage in sewage sludge is high, volume is large, bring difficulty to stacking and transport, if municipal sludge is dealt with improperly or not the norm handles, as arbitrarily thrown aside farmland abuse etc., serious potential threat can be caused by ecotope.On the other hand, excess sludge contains very high organotrophy matter and fuel value, and the Land_use change of mud and energy recycling are a kind of muds with bright prospects, and moisture percentage in sewage sludge height directly affects the regeneration cost of mud recycling.No matter be response national policy or resource regeneration, pursue low moisture percentage in sewage sludge all by imperative.Therefore deeply dehydrating sludge is paid attention to by various countries always deeply, and mud is problems that countries in the world are paid attention to jointly as effective utilization of renewable resource, represents the direction of human environment ecological benefits, Social benefit and economic benefit balanced development.
Mechanical dehydration only can make free water and the interstitial water be present between mud granule is removed; Bonding force between capillary water and mud granule is comparatively strong, need by higher mechanicals efforts and energy; In born of the same parents, the content of water is relevant with the ratio shared by microorganism cells in mud, and it is impracticable for making mechanically to remove this part water, and need adopt heat and the measure such as freezing.From the angle destroying sludge water content combining form, can utilize that compost, lime are modified, sludge chemical modification, the technique such as heat drying technology and osmosis.Anaerobism or mostly to adopt amendment to nurse one's health to reduce after moisture percentage in sewage sludge compost again to produce containing oxygen compost, there is floor space large, stink is comparatively large, the weak points such as the cycle of operation is long, and working cost is higher, and processing power is less.Lime modified dewatering process Lime-Injecting rate is 20% ~ 30%, and the weightening finish of Lime-Injecting amount large mud is comparatively large, and mud volume is larger, production cycle is longer, and mud cake and filtrate are alkalescence, and filtrate also needs adjust ph process, the requirement for anticorrosion of equipment is also higher, and working cost is higher.Mud dosing modification generally adopts medicament to nurse one's health mud, not to the change that mud carries out in essence, and the improvement of mechanical means that what the water ratio reducing mud relied on is.Mud dosing modification technology divides the settling property modification of sludge bacteria micelle and the modification of mud Zoogloea bacteria, for sludge settling property modification, the dehydration rate of mud can only drop to about 65%, and the total addition level of amendment accounts for mud butt ratio reaches more than 20%, in fact and the minimizing of unrealized mud mud increase-volume problem is comparatively serious.
Heat drying and other pyrolytic technique due to moisture percentage in sewage sludge higher, sludge calorific value can not maintain self sludge drying and run and need to increase the external source energy, and energy consumption is very large, and running cost is very high.There is facility investment, running cost costly in osmosis dry method, the very high weak point of maintenance requirement of equipment.These methods are not there is water ratio can not reach requirement to there is running cost exactly too high or increase the shortcomings such as mud capacity and can not meet needed for reality.
Therefore, the difficult problem that current deeply dehydrating sludge faces is, existing sludge disposal technology exists complex process, energy consumption, facility investment, running cost are too high, and unrealized sludge reduction, easily affect regeneration or the later use of mud, the shortcomings such as environmental benefit difference.
Summary of the invention
The object of the present invention is to provide a kind of method utilizing sun power pyrolysis carbonization technical finesse mud, the method energy consumption, facility investment, running cost are low, can realize innoxious, the stabilization of mud, minimizing and the utilization of resources.
Above-mentioned purpose of the present invention is achieved through the following technical solutions: a kind of method utilizing sun power pyrolysis carbonization technical finesse mud, containing following steps: get the mud that municipal sewage treatment produces, be placed in pyrolysis carbide furnace, in sealing, anaerobic, carry out under non-burning state comprising vaporization, pyrolysis, dehydrogenation, the series reaction of pyrocondensation and carbonization, generate tail gas, charcoal and tar, wherein pyrolysis carbide furnace provides thermal source by solar energy heat distribution system, reaction conditions is high-temperature pressure or High Temperature High Pressure or middle High Temperature High Pressure, described high temperature is 500 ~ 800 DEG C, described middle high temperature is 200 ~ 400 DEG C, described high pressure is 1 ~ 16MPa.
Municipal sludge of the present invention is placed in pyrolysis carbide furnace (also can be called pyrolysis carbide furnace, preferably first through dehydration and/or drying treatment Hereinafter the same).
As a modification of the present invention, a kind of method utilizing sun power pyrolysis carbonization technical finesse mud provided by the invention, further containing following steps:
(1) drying sludge: the mud that municipal sewage treatment produces is carried out drying treatment, obtain sludge-drying, one or more in the heat of the water vapour produced when the heat that the combustible gas burning in the tail gas that the origin of heat of drying treatment is the remaining temperature of the tail gas that in step (2), pyrolysis carbide furnace produces, pyrolysis carbide furnace produces in step (2) produces and drying treatment, or the origin of heat of drying treatment is external heat source;
(2) pyrolysis carburizing reagent: the sludge-drying obtained in step (1) is placed in pyrolysis carbide furnace, under sealing, anaerobic, non-burning state, carry out comprising the series reaction of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, generate tail gas, charcoal and tar, wherein pyrolysis carbide furnace provides thermal source by solar energy heat distribution system, reaction conditions is high-temperature pressure or High Temperature High Pressure or middle High Temperature High Pressure, described high temperature is 500 ~ 800 DEG C, described middle high temperature is 200 ~ 400 DEG C, and described high pressure is 1 ~ 16MPa;
(3) combustible gas utilizes: the product comprising combustible gas, charcoal and tar produced by step (2) pyrolysis carbide furnace, be separated after heat exchange process, obtain combustible gas, gained combustible gas is used for providing heat to the drying treatment in step (1).
Utilize in the method for sun power pyrolysis carbonization technical finesse mud above-mentioned:
Before the mud that municipal sewage treatment described in step (1) produces carries out drying, preferably first carry out processed.
In step (1), during drying treatment, time of drying is preferably 120 ~ 150min.
Here it should be noted that, drying treatment is except can adopting the thermal source that produces in the present invention in step of the present invention (1), also can adopt outside thermal source, just adopt the thermal source produced in the present invention thermal source can be reused, energy-conserving and environment-protective.
As sewage work have sludge dewatering treatment facility then by dehydration after mud cake directly put dehumidification system into, time of drying with in mud water ratio difference can carry out suitable adjustment, be preferably 120 ~ 150min.
Under sealing, anaerobic, non-burning state, carry out comprising the series reaction of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization in step (2), when reaction conditions is high-temperature pressure, reaction times is preferably more than 2h, reaction conditions be High Temperature High Pressure or middle High Temperature High Pressure time, the reaction times is preferably 1 ~ 2h.
Need before reaction in the present invention in pyrolysis carbide furnace ensure vacuum, with satisfied reaction require oxygen free condition, preferably at sludge-drying before entering pyrolysis carbide furnace, need furnace air be taken away, ensure vacuum, meet the oxygen free condition that reaction requires, then nitrogen is filled with, adjustment furnace pressure.
After the reaction of sludge-drying in pyrolysis carbide furnace, residual moisture evaporation in sludge-drying, organism is converted into tail gas, tar and charcoal.
When pyrolysis carbide furnace provides thermal source by solar energy heat distribution system in step (2), described solar energy heat distribution system by traditional sun power be converted into heat energy, be again electric energy by thermal energy, be the supply model heat supply of heat energy by electric energy conversion again; Or described solar energy heat distribution system is directly converted into the supply model heat supply of heat energy by sun power.
Adopt in the present invention high-temperature pressure or high temperature high pressure reverse seasonable, hot conditions is more than 400 DEG C, now, if adopt traditional solar energy heat distribution system, namely heat energy is converted solar energy into by traditional, be electric energy by thermal energy again, be the supply model heat supply of heat energy again by electric energy conversion, now solar energy utilization ratio is extremely low, only there is the utilization ratio of 10%, cost of investment is relatively high, and when adopting (specifically please participate in the description in the Examples below 4) solar energy heat distribution system in the present invention, directly can convert solar energy into heat energy, solar energy utilization ratio can up to 60 ~ 85%, cost of investment is relatively low.
When adopting in the present invention the solar energy heat distribution system designed, temperature can within the scope of 80 ~ 1000 DEG C any regulable control, intelligent automatic control can be realized.
High pressure described in step (2) is preferably by N
2compression system provides.Also other rare gas elementes can be adopted to pressurize.
As reacted under high-temperature and high-pressure conditions in selection in step of the present invention (2), then open N
2compression system pressurizes in stove, arranges pressure parameter according to working condition.
The temperature of the pyrolysis carbide furnace described in step (2) is preferably 25 DEG C of (or normal temperature) ~ 1000 DEG C (in this temperature range, according to the needs of duty parameter, any regulable control), pressure is that 0.1 ~ 16MPa is (in this pressure range, according to the needs of duty parameter, any regulable control).
High temperature described in step (2) more preferably 600 ~ 800 DEG C, described middle high temperature more preferably 350 ~ 400 DEG C, high pressure is 6 ~ 12MPa more preferably.
For solving problems of the prior art, contriver finds in a large amount of practical explorations, under the condition that pressure is different, temperature needed for carbonization, reaction times are also different, and pressure is higher, and the temperature needed for carbonization is lower, reaction times is shorter, as at ambient pressure, carbonization needs the high temperature of more than 600 DEG C, and the reaction times needs more than 2 hours; Under 6MPa pressure condition, carbonization only needs the middle temperature of about 380 DEG C, and the reaction times needs 2 hours; Under 12MPa pressure condition, carbonization only needs the middle temperature of about 330 DEG C, and the reaction times needs about 80 minutes.
Heat exchange described in step (3) is treated to middle for the heat supplying step (1) of the tail gas produced in step (2) drying treatment.
Be separated when being separated after heat exchange process in step (3) and adopt triphase separator to be separated.
The tail gas produced in step of the present invention (2) is through over-heat-exchanger (providing heat to dehumidification system), enter three-phase decontaminating separator again, purification draws the combustible gas such as methane, hydrogen, and combustible gas burns to be provided heat to charging dehumidification system or bottle that his uses.
The environment-friendly high-efficiency treatment process of the mud that the present invention produces through above-mentioned municipal effluent, can obtain mass percentage be about 10% based on mesopore, micropore is auxiliary charcoal, mass percentage be about 1% tar and mass percentage be the combustible gas of about 6%, wherein combustible gas comprises methane, hydrogen etc., and remaining other parts are water vapour.
The present invention finds through detecting, the charcoal product (as shown in fig. 1) that the present invention obtains can make metal ion be solidificated in the pore surface of charcoal, make the bio-available Zn concentration of the heavy metal in sludge organism charcoal very low, present " inert condition ", therefore the heavy metal in charcoal is not easy migration, is also not easy to be absorbed by plants.
The present invention has the following advantages:
(1) sewage plant excess sludge utilizes sun power to carry out dry deep dehydration, realize sludge deep process minimizing: the heat that the inventive method utilizes solar energy heat distribution system to be supplied to the generation of pyrolysis carbide furnace has carried out deep dehydration to mud, in sludge-drying, water ratio reaches less than 25%, reach the national environmental standard of direct sanitary landfill, meeting the regulation in " notices about strengthening the preventing and controlling of urban wastewater treatment firm sludge pollution " that general office of Chinese Ministry of Environmental Protection 2010 issues (ring is done [2010] No. 157), sludge deep process minimizing can be realized;
(2) specific resistance to filtration is realized innoxious: the inventive method owing to implementing under high temperature or middle hot conditions, can effectively kill pathogenic agent and bacterium colony, there is not the problem such as pathogenic agent and bacterium colony resurrection yet, heavy metal ion is efficiently cured in charcoal, is not easy migration and is absorbed by plants; The smelly degree of mud drops to less than 1 °; Reach mud safe handling and dispose environmental protection standard, because the present invention uses sun power clean energy, can not secondary pollution be brought in process disposal process;
(3) utilization of resources is realized: the inventive method does not need to carry out modified to mud, do not add the additive that CaO etc. affects sludge calorific value, the charcoal fuel value produced is about 1800 kilocalories, can be used as low calorie fuels supply thermal power plant or cement mill, brick field etc. as replacement of fuel thing, and tar and the combustible gas such as methane, hydrogen also can produce economic benefit, ash content can be used as the raw materials for production of light building material or makes haydite, is with a wide range of applications;
(4) technical superiority economic benefit is obvious: the inventive method and common specific resistance to filtration technology, as as follows in the contrast in economic and technical norms such as landfill, burning: generally speaking, the inventive method can process various sewage sludge, not by the impact of mud inclusion, this is also that other technology can not be compared, in construction investment, it is a little more than compost and landfill, but about being equivalent to the half of burning; Floor space is minimum, is only 1/10 of landfill, 1/6 of compost; In operational cost, because the inventive method has the ability of profit, this is not more that other technology can be compared; The finished product of the inventive method are the charcoal (market price 600 yuan/ton) of about 10%, 1 ton of water ratio be 80% the product benefit that drawn by the technique in the present invention of excess sludge be: produce 100kg charcoal, be worth 60 yuan; Save mud outward transport landfill cost 275 yuan; Adding up to extra earning to be worth is 335 yuan/ton of wet mud;
(5) to the whole process of lignin-sludge, there is controllability: the mud in the present invention can process in sewage work workshop, sludge treatment is completely independently carried out, not by any external environment influence, and the sewage work as sludge treatment responsible party can be made to possess controlled ability to sludge treatment whole process, when avoiding the problem of environmental pollution due to the generation of external treatment mud unit, negative upper joint & several liability, in addition, lignin-sludge facility floor space is little, be applicable to mud dispersion treatment, avoid the problem of environmental pollution in transportation, minimize transport costs, Nonrenewable energy resources can be substituted, meet the requirement of Sustainable development, present invention process can process various sewage sludge, not by the impact of mud inclusion, this is also that other technology can not be compared.
Below by embodiment and accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes the charcoal produced in the method for sun power pyrolysis carbonization technical finesse mud;
Fig. 2 is the method flow diagram utilizing sun power pyrolysis carbonization technical finesse mud in the embodiment of the present invention 1,3,4,5,6,7,8 and 9;
Fig. 3 is the method flow diagram utilizing sun power pyrolysis carbonization technical finesse mud in the embodiment of the present invention 2,10 and 11;
Fig. 4 is the structural representation of the solar energy heat distribution system adopted in the embodiment of the present invention 4,10 and 11;
Fig. 5 is the structural representation of the heat-accumulator tank in Fig. 4;
Fig. 6 is the structural representation of the process furnace in Fig. 5; Wherein 1, heat absorber; 2, solar energy collector; 3, pipeline; 4, heat-accumulator tank; 5, pump for liquid salts; 6, heating device; 7, flow valve; 8, well heater; 9, process furnace; 10, thermal insulation layer; 11, pump for liquid salts liquid sucting port; 12, fused salt; 13, heating object.
Embodiment
The excess sludge of embodiment 1 Yangdong sewage work of economic and technological development zone water ratio 99.7%
As shown in Figure 2, extracting 40kg water ratio is the excess sludge of 99.7%, after sludge dewatering treatment facility processed, mud cake after dehydration is directly entered dehumidification system, time of drying is 130 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace (can adopt the pyrolysis carbide furnace sold on the market), opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when making stove internal gas pressure be down to 0MPa, opens solar energy heat distribution system and N
2compression system, wherein solar energy heat distribution system adopts traditional solar energy heat distribution system, its by traditional sun power be converted into heat energy, be again electric energy by thermal energy, be the supply model heat supply of heat energy by electric energy conversion again, pyrolysis carbonization in-furnace temperature is made to control at 380 DEG C, pressure-controlling is at 6MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 120min of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use.
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of embodiment 2 Yangdong sewage work of economic and technological development zone water ratio 99.7%
As shown in Figure 3, extract 40kg water ratio be 99.7% excess sludge directly enter dehumidification system, time of drying is 130 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, opens solar energy heat distribution system and N
2compression system, wherein solar energy heat distribution system by traditional sun power be converted into heat energy, be again electric energy by thermal energy, be the supply model heat supply of heat energy by electric energy conversion again, temperature controls at 330 DEG C, pressure-controlling is at 12MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 80 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain combustible gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use;
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of embodiment 3 Yangdong sewage work of economic and technological development zone water ratio 99.7%
As shown in Figure 2, extract the excess sludge of 40kg water ratio 99.7%, the mud cake that water ratio is 65% is obtained through primary sludge processed system, put the mud cake after dehydration into dehumidification system, time of drying is 120 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud is entered pyrolysis carbide furnace, opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, open solar energy heat distribution system and N
2compression system, wherein solar energy heat distribution system by traditional sun power be converted into heat energy, be again electric energy by thermal energy, be the supply model heat supply of heat energy by electric energy conversion again, temperature controls at 200 DEG C, pressure-controlling is at 16MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 60 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use;
Then open pyrolysis carbide furnace (pyrolysis carbide furnace), allow pack after charcoal naturally cooling utilize.
The excess sludge of embodiment 4 Yangdong sewage work of economic and technological development zone water ratio 65%
As shown in Figure 2, extracting 40kg water ratio is the excess sludge of 65%, the dehydrated sludge cake that water ratio is 50% is obtained through primary sludge processed system, put dehydrated sludge cake into dehumidification system, time of drying is 120 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, open the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, open solar energy heat distribution system, wherein solar energy heat distribution system adopts the solar energy heat distribution system designed in the present invention, it directly converts solar energy into heat energy, temperature controls at 800 DEG C, and pass into nitrogen, furnace pressure is made to rise to normal pressure, under sealing, anaerobic, non-burning state, carry out comprising more than the series reaction 2h of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use.
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
Solar energy heat distribution system in the present embodiment, its structure as shown in Figure 4, comprise the devices such as heat absorber 1, solar energy collector 2, heat-accumulator tank 4, pump for liquid salts 5, heating device 6, flow valve 7, well heater 8 and process furnace 9, each device is interconnection by refractory metal pipeline 3, and cover at the outside surface of pipeline 3 and heat-accumulator tank 4 and resistance toly have soak material 10, each device is fixedly connected with by the mode of flange, cutting ferrule or welding.
This solar energy heat distribution system can produce and carry, stores more than 400 DEG C of high temperature, and heat of high temperature is delivered to process furnace by solar energy collector by the continuous circulation by fused salt, and can maintain uninterruptedly carrying out of heating.
Wherein solar energy collector 2, can adopt dish-style or groove type solar thermal-arrest mode, for obtaining higher Heating temperature, also can adopt tower thermal-arrest mode.
Solar energy collector 2, wherein the parabola of solar energy collector 2 is controlled by solar energy tracking device, and sun angle is followed the tracks of in adjustment in real time, obtains higher collecting efficiency.
Heat absorber 1, is entwined by refractory metal pipe, according to Endothermic power difference adjustment endothermic tube length and diameter.
Heat-accumulator tank 4, its tank body is processed by refractory metal material, and tank body is provided with fused salt refluxing opening and pump for liquid salts drives mouth, and tank body outside surface covers high-temperature-resistant thermal-insulation material.
Pump for liquid salts 5, it can bear more than 400 DEG C heat of high temperature.
Heating device 6, it adopts electric heating device to cover pipeline outside surface, and covers high-temperature-resistant thermal-insulation material at skin.
Flow valve 7, it can bear more than 400 DEG C high temperature, and can adjust the flow of fused salt.
Well heater 8, it is entwined by refractory metal pipe, according to Endothermic power difference adjustment endothermic tube length and diameter.
Process furnace 9, its body of heater is processed by refractory metal material, arranges well heater and heating object in stove, and body of heater outside surface covers high-temperature-resistant thermal-insulation material.
As shown in Figure 5, the shell opposite position place of heat-accumulator tank 4 top and heat-accumulator tank 4 is respectively arranged with pump for liquid salts imbibing hole and fused salt return port, for being fixedly connected with high-temperature melting salt pump 5 and connecting pipeline 3, heat-accumulator tank 4 outside covers high-temperature-resistant thermal-insulation layer 10, pump for liquid salts liquid sucting port 11 is positioned at more than heat-accumulator tank 4 inner bottom surface 15 ~ 20cm place, during operation, fill the fused salt amount corresponding to required heat-up time in heat-accumulator tank 4 inside.
As shown in Figure 6, process furnace 9 is processed by refractory metal material, and the upper and lower two ends of body of heater arrange two openings respectively for the inflow of fused salt and outflow.Well heater 8 is set in stove, and fills required heating object 13 (fused salt).
When system is run first, first start the heating device 6 being covered in pipeline outside, the solid-state fused salt of the remnants in pipeline 3 is heated, makes it become molten state, thus can flow in pipeline 3 under the driving of pump for liquid salts 5.System need make fused salt in system all be in high temperature fused state through several pump circulation.
Solar energy collector 2 is collected and is produced more than 400 DEG C of heat of high temperature, and transfer heat to the heating agent fused salt 12 flowing through heat absorber 1 inside, fused salt 12 is warming up to the condition of high temperature, and enters heat-accumulator tank 4 by pipeline 3 under the driving of pump for liquid salts 5.Under Effects of Density, the fused salt that temperature is higher is positioned at the topside position of heat-accumulator tank 4, and the low-temperature molten salt of bottom is driven across liquid sucting port 11 by pump for liquid salts 5 and flows to well heater 8, and finally flows to heat absorber 1, completes a heating cycle.After several pump circulation, the fused salt in heat-accumulator tank 4 is all in the condition of high temperature.
When fused salt is all in the condition of high temperature, then can the heated material 13 in process furnace 9 be heated, fused salt after release heat of high temperature reduces temperature, enter under the driving of pump for liquid salts 5 after heat absorber 1 absorbs and return to the condition of high temperature, and reenter the heat-processed that circulation line 3 carries out next time.
If during extraneous solar radiation quantity not sufficient, native system can utilize the fused salt in heat-accumulator tank 4 to heat downstream to well heater 8 pairs of heated materials 13 in the driving of pump for liquid salts 5, and be back to heat-accumulator tank 4, fused salt loading level in heat-accumulator tank 4, through calculating design, can meet the uninterrupted heating under processing requirement condition heat-up time.
When not needing heating, all fused salts in pipeline in the molten state automatic back flow store to heat-accumulator tank inside holding, can long term maintenance molten state, above-mentioned pipeline heating device 6 heating operation required when running first can be avoided, reduce further and run difficulty, reduce running cost.
The excess sludge of mountain fire Ju Yuan sewage work water ratio 80% in embodiment 5 Yangxi
As shown in Figure 2, extract 40kg through primary sludge processed system obtain water ratio be 80% mud cake put dehumidification system into, time of drying is 125 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, opens solar energy heat distribution system and N
2compression system, wherein solar energy heat distribution system is directly converted into the supply model heat supply of heat energy by sun power, its concrete structure and using method are with embodiment 4, temperature controls at 400 DEG C, pressure-controlling is at 4MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 120 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use;
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of mountain fire Ju Yuan sewage work water ratio 80% in embodiment 6 Yangxi
As shown in Figure 2, extract 40kg through primary sludge processed system obtain water ratio be 80% mud cake put dehumidification system into, time of drying is 120 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, opens solar energy heat distribution system and N
2compression system, solar energy heat distribution system is with embodiment 1, and temperature controls at 350 DEG C, and pressure-controlling is at 8MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 100 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use;
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of mountain fire Ju Yuan sewage work water ratio 80% in embodiment 7 Yangxi
As shown in Figure 2, extract 40kg through primary sludge processed system obtain water ratio be 80% mud cake put dehumidification system into, time of drying is 120 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, opens solar energy heat distribution system and N
2compression system, temperature controls at 320 DEG C, and solar energy heat distribution system is with embodiment 1, and pressure-controlling is at 14MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 80 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use.
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of embodiment 8 Yangjiang City first sewage work water ratio 80%
As shown in Figure 2, extract 40kg through primary sludge processed system obtain water ratio be 80% mud cake put into dehumidification system (if any sludge dewatering treatment facility then by dehydration after mud cake directly put dehumidification system into), time of drying is 120 minutes, the origin of heat of dehumidification system be proprietary pyrolysis carbide furnace tail gas more than the heat that produces of gentle combustible gas burning and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, opens solar energy heat distribution system and N
2compression system, temperature controls at 390 DEG C, and solar energy heat distribution system is with embodiment 1, and pressure-controlling is at 5MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 120 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product.
The tail gas produced in stove again through over-heat-exchanger (providing heat to charging dehumidification system), then enters three-phase decontaminating separator, and purification draws the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use.
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of embodiment 9 Yangjiang City first sewage work water ratio 80%
As shown in Figure 2, extract 40kg through primary sludge processed system obtain water ratio be 80% mud cake put dehumidification system into, time of drying is 120 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, opens the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, opens solar energy heat distribution system and N
2compression system, temperature controls at 340 DEG C, and solar energy heat distribution system is with embodiment 1, and pressure-controlling is at 9MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 100 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product;
The tail gas produced in pyrolysis carbide furnace is again through over-heat-exchanger (providing heat to charging dehumidification system), enter three-phase decontaminating separator again, purification draw the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use;
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of embodiment 10 Yangjiang City first sewage work water ratio 80%
As shown in Figure 3, extract 40kg water ratio be 80% excess sludge put dehumidification system into, time of drying is 150 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, open the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, open solar energy heat distribution system, solar energy heat distribution system is with embodiment 4, and temperature controls at 500 DEG C, and pass into nitrogen, make furnace pressure rise to 1MPa, under sealing, anaerobic, non-burning state, carry out comprising the series reaction 120 minutes of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtain tail gas, tar and charcoal product.
The tail gas produced in stove again through over-heat-exchanger (providing heat to charging dehumidification system), then enters three-phase decontaminating separator, and purification draws the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use.
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The excess sludge of embodiment 11 Yangjiang City first sewage work water ratio 60%
As shown in Figure 3, extract 40kg water ratio be 60% excess sludge put dehumidification system into, time of drying is 140 minutes, the origin of heat of dehumidification system be pyrolysis carbide furnace tail gas more than the heat that produces of combustible gas burning in gentle tail gas and the heat of water vapour that self produces;
Dried mud enters pyrolysis carbide furnace, open the lift pump of RESEARCH OF PYROCARBON gasification furnace system, when stove internal gas pressure is down to 0MPa, open solar energy heat distribution system, temperature controls at 600 DEG C, and passes into nitrogen, furnace pressure is made to rise to 3MPa, solar energy heat distribution system, with embodiment 4, carries out comprising the series reaction 1.5h of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, obtains tail gas, tar and charcoal product under sealing, anaerobic, non-burning state.
The tail gas produced in stove again through over-heat-exchanger (providing heat to charging dehumidification system), then enters three-phase decontaminating separator, and purification draws the combustible gas such as methane, hydrogen, combustible gas bottle to charging dehumidification system provide heat or his use.
Then open pyrolysis carbide furnace, allow pack after charcoal naturally cooling utilize.
The present invention will be described to enumerate a part of specific embodiment above, be necessary to herein means out be above specific embodiment only for the invention will be further described, do not represent limiting the scope of the invention.Some nonessential amendments that other people make according to the present invention and adjustment still belong to protection scope of the present invention.
Claims (10)
1. one kind utilizes the method for sun power pyrolysis carbonization technical finesse mud, it is characterized in that containing following steps: get the mud that municipal sewage treatment produces, be placed in pyrolysis carbide furnace, in sealing, anaerobic, carry out under non-burning state comprising vaporization, pyrolysis, dehydrogenation, the series reaction of pyrocondensation and carbonization, generate tail gas, charcoal and tar, wherein pyrolysis carbide furnace provides thermal source by solar energy heat distribution system, reaction conditions is high-temperature pressure or High Temperature High Pressure or middle High Temperature High Pressure, described high temperature is 500 ~ 800 DEG C, described middle high temperature is 200 ~ 400 DEG C, described high pressure is 1 ~ 16MPa.
2. the method utilizing sun power pyrolysis carbonization technical finesse mud according to claim 1, is characterized in that: described municipal sludge is first through dehydration and/or drying treatment before being placed in pyrolysis carbide furnace.
3. the method utilizing sun power pyrolysis carbonization technical finesse mud according to claim 1, is characterized in that further containing following steps:
(1) drying sludge: the mud that municipal sewage treatment produces is carried out drying treatment, obtain sludge-drying, one or more in the heat of the water vapour produced when the heat that in the tail gas that the origin of heat of drying treatment is the remaining temperature of the tail gas that in step (2), pyrolysis carbide furnace produces, pyrolysis carbide furnace produces in step (2), combustible gas burning produces and drying treatment, or the origin of heat of drying treatment is external heat source;
(2) pyrolysis carburizing reagent: the sludge-drying obtained in step (1) is placed in pyrolysis carbide furnace, under sealing, anaerobic, non-burning state, carry out comprising the series reaction of vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization, generate tail gas, charcoal and tar, wherein pyrolysis carbide furnace provides thermal source by solar energy heat distribution system, reaction conditions is high-temperature pressure or High Temperature High Pressure or middle High Temperature High Pressure, described high temperature is 500 ~ 800 DEG C, described middle high temperature is 200 ~ 400 DEG C, and described high pressure is 1 ~ 16MPa;
(3) combustible gas utilizes: the tail gas produced by step (2) pyrolysis carbide furnace, is separated after heat exchange process, and obtain combustible gas, gained combustible gas can be used for providing heat to the drying treatment in step (1).
4. the method utilizing sun power pyrolysis carbonization technology to process mud according to claim 3, is characterized in that: before the mud that the municipal sewage treatment described in step (1) produces carries out drying, first carry out processed.
5. the method utilizing sun power pyrolysis carbonization technology to process mud according to claim 3, is characterized in that: in step (1), during drying treatment, time of drying is 120 ~ 150min.
6. the method utilizing sun power pyrolysis carbonization technical finesse mud according to claim 3, it is characterized in that: the series reaction of carrying out comprising vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonization in step (2) under sealing, anaerobic, non-burning state, when reaction conditions is high-temperature pressure, reaction times is more than 2h, reaction conditions be High Temperature High Pressure or middle High Temperature High Pressure time, the reaction times is 1 ~ 2h.
7. the method utilizing sun power pyrolysis carbonization technical finesse mud according to claim 3, it is characterized in that: when pyrolysis carbide furnace provides thermal source by solar energy heat distribution system in step (2), described solar energy heat distribution system by traditional sun power be converted into heat energy, be again electric energy by thermal energy, be the supply model heat supply of heat energy by electric energy conversion again; Or described solar energy heat distribution system is directly converted into the supply model heat supply of heat energy by sun power.
8. the method utilizing sun power pyrolysis carbonization technical finesse mud according to claim 3, is characterized in that: the high pressure described in step (2) passes through N
2compression system provides.
9. the method utilizing sun power pyrolysis carbonization technical finesse mud according to claim 1, is characterized in that: the heat exchange described in step (3) is treated to middle for the heat supplying step (1) of the tail gas produced in step (2) drying treatment.
10. the method utilizing sun power pyrolysis carbonization technical finesse mud according to claim 1, is characterized in that: be separated when being separated after heat exchange process in step (3) and adopt triphase separator to be separated.
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| WO2016127594A1 (en) | 2016-08-18 |
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