CN104944716A - Medium-pressure superheated steam-based continuous anaerobic sludge digestion pretreatment device and method - Google Patents
Medium-pressure superheated steam-based continuous anaerobic sludge digestion pretreatment device and method Download PDFInfo
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Abstract
The invention discloses a medium-pressure superheated steam-based continuous anaerobic sludge digestion pretreatment device and a method thereof. According to the technical scheme of the invention, a preheating conditioning tank, a medium-pressure steam reaction tank set and a pressure-relief cracking tank are combined together and the continuous treatment is realized based on the combination control. The viscosity of the treated sludge/kitchen rubbish is reduced by 50%-90%. At the same time, macromolecular matters are converted into micromolecular matters, so that the properties and the structure of the sludge or the organic rubbish are changed. The content of soluble organic matters is improved by 100%-1000%. Moreover, the biodegradable performances of the sludge and the kitchen rubbish are improved. During the anaerobic digestion of the treated sludge/kitchen rubbish, the conversion rate of organic matters is improved by almost over 50%. Therefore, a greater amount of biogas is provided and the resourceful treatment is realized.
Description
Technical field
The invention belongs to mud and changing food waste processing technology field, be specifically related to a kind of Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam and method thereof.
Background technology
Anaerobic digestion techniques effectively can realize the stabilization of mud or changing food waste, minimizing, innoxious and resource utilization, and China specifies, the sewage work of more than 100,000 tons/day scales should set up sludge treatment facilities.Anaerobic digestion, due to recovering energy source, is widely used in current many countries, and anaerobic digestion process is divided into 4 stages: hydrolysis stage, fermentation stage, product acetic acid stage and methane phase stage.Wherein hydrolysis stage is complicated non-solubility polymer conversion is simply dissolving monomer and dimeric process, for the anaerobic digestion of the high solid waste of solid content, biological hydrolysis is the rate-limiting step of whole process, so anaerobic digestion generally needs the longer residence time and larger digester, for mud, mud is mainly made up of microorganism, the matrix of carrying out needed for anaerobic digestion is included in cytolemma, therefore only break cell walls (film) these organic matters are discharged, anaerobic digestion could utilize this part organic, and the process of broken wall completes at hydrolysis stage, the speed of broken wall directly governs efficiency and the effect of anaerobic digestion.
Current treatment technology mainly contains alkaline hydrolysis process, thermal treatment, the method such as ultrasonication and microwave treatment, heat treating process is as a kind of ideal treatment technology, prior art also has the report about thermal treatment technology for hydrolyzing, as CN104271517A discloses a kind of method and apparatus of the thermal hydrolysis for mud, this equipment is by two retort and control related process parameters and carry out thermal hydrolysis to mud, but sewage sludge viscosity is too high, it is directly sent into retort and can increase the difficulty of mud mixing and the energy consumption of process undoubtedly, and not easily realize running continuously, high to the requirement of equipment and pipeline valve, easy blocking pipe, as CN103100551A discloses a kind of rubbish from cooking thermal hydrolysis method and device thereof, it is provided with opening for feed at the top of this device tank body, is provided with discharge gate in the bottom of the sidewall of tank body, is provided with at least three steam inlets on the top of the sidewall of tank body, but steam-in is unfavorable for the diffusion of steam in mud and mixes with mud on top, and steam-pipe can easily result in blockage from extension in retort, and maintenance difficulty.
Summary of the invention
The object of the present invention is to provide a kind of Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam and method thereof, this device can realize continuous feeding and discharging, and mud fully can be mixed without the need to installing whipping device, hot steam is continuable to be delivered in middle pressure steam retort, improves rate of heat exchange and recycle heat is recycled.
One of task of the present invention is to provide a kind of Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam.
A kind of Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam, it comprises middle pressure steam retort group and pressure release cracks tank, also comprise preheating conditioning tank, described preheating conditioning tank is for holding pending material, steam-in is provided with above the side of described preheating conditioning tank, steam in described middle pressure steam retort group enters in preheating conditioning tank by described steam-in, the discharge port of described preheating conditioning tank is communicated with the opening for feed of described middle pressure steam retort, the discharge port of described middle pressure steam retort group is communicated with the opening for feed that described pressure release cracks tank, described steam reaction tank group comprises the steam reaction tank of at least three arranged in parallel, wherein, the opening for feed of each steam reaction tank is all connected with the discharge port that tank is nursed one's health in above-mentioned preheating by corresponding pipeline, and the discharge port of each steam reaction tank is all connected with the opening for feed that above-mentioned pressure release cracks tank by corresponding pipeline.
By preheating conditioning tank, treating material is heated, and material fully can be mixed under the effect of fresh feed pump, 10-30% can be reduced by its viscosity of material after the process of preheating conditioning tank, be beneficial to the carrying out of postorder work for the treatment of, the steam reaction tank of above-mentioned three arranged in parallel runs according to intermittent mode, its overall and preheating nurse one's health tank and pressure release and is cracked between tank and coordinate, and can realize the continuous operation of this device, raising processing efficiency.
As a preferred version of the present invention, opening for feed and the preheating of each steam reaction tank are nursed one's health to crack on pipeline that tank discharge port is connected, with pressure release on pipeline that tank opening for feed is connected and are provided with valve.
As another preferred version of the present invention, above-mentioned steam reaction tank group is injecting steam wherein from bottom, the vapour outlet at above-mentioned steam reaction tank group top is connected on main line through respective outlet branch road, the steam-in that tank is nursed one's health in one end and the preheating of above-mentioned main line is connected, and the steam-in that the other end and pressure release crack tank top is connected.
Preferably, the pipeline that above-mentioned preheating conditioning tank opening for feed place connects is provided with fresh feed pump, by above-mentioned fresh feed pump, mixing of materials is even.
Two of task of the present invention is to provide the treatment process of the above-mentioned Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam, and it comprises the following steps:
A, first in each steam reaction tank, pass into steam, control makes steam enter in preheating conditioning tank through main line, pending material is sent in preheating conditioning tank through fresh feed pump, by described steam, material is wherein heated, the residence time of material in preheating conditioning tank is 15-30min, and temperature controls as 94-98 DEG C;
B, the material after step a process is injected middle pressure steam retort group, it injects described material successively by by-pass valve control in each middle pressure steam retort, wherein, middle pressure steam retort keeps intermittent operation mode, in middle pressure steam retort, temperature is 130-190 DEG C, and the treatment time is 15-30min;
C, by after step b process material inject pressure release crack in tank, the treatment time is 15-60min, control temperature 100 DEG C-103 DEG C, pressure 0.1-0.15MPa.
Its viscosity of material after step a process reduces 10-30%, and its viscosity of the material after step b process reduces 50-80%; Mud particle diameter after step c process reduces 30%-80%.
In above-mentioned steps a, the water ratio for the treatment of material is 80-90%.
The Advantageous Effects that the present invention brings:
The present invention proposes a kind of Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam and method thereof, compared with prior art, it has the following advantages:
(1) by preheating conditioning tank and coordinating between steam reaction tank group, apparatus of the present invention can realize continuous feeding and discharging, not only increase the processing power of device, also greatly reduce equipment failure rate; (2) preheating conditioning tank is to treating material as carried out preheating conditioning to mud or changing food waste, by reducing mud or changing food waste viscosity after the process of preheating conditioning tank, is beneficial to conveying and the mixing of mud or changing food waste; (3) preheating conditioning tank of the present invention, middle pressure steam retort group and pressure release crack tank all without the need to installing whipping device, preheating conditioning tank realizes the abundant mixing of mud by fresh feed pump, each middle pressure steam retort realizes mud mixing by the steam passed into bottom it, not only reduce process line failure rate, also save energy consumption, thus reduce working cost; (4) hot steam is continuable is delivered in middle pressure steam retort, and heat utilization ratio can improve 5%-10%; (5) each middle pressure steam retort and pressure release crack the exhaust steam reuse that tank produces and nurse one's health to preheating, and whole technical process is airtight, can save energy consumption, also avoids waste gas to the pollution of environment, reduces by the two heavy risks polluted; (6) charging, discharging, temperature, pressure, liquid level etc. of preprocessing process are controlled by middle control, and level of automation is high, and operation is simple.
The treatment process of pretreatment unit of the present invention, macromolecular substance is converted into small-molecule substance by it, change character and the structure of mud or organic waste, the viscosity of its mud after treatment or changing food waste can reduce 50%-90%, increase the content of dissolved organic matter, 100%-1000% can be improved, improve the biodegradable performance of mud and changing food waste, when anaerobic digestion is carried out again to the mud after process or changing food waste, organic matter transformation rate improves nearly more than 50%, thus obtain more biogas, realize recycling treatment, the recycle of waste hot steam, can realize energy-conservation, running cost reduces greatly.
The present invention is compared with CN 104271517A, not only can realize continuous operation, also set up preheating conditioning tank, the waste hot steam that middle pressure steam retort and pressure release crack tank is back to use preheating conditioning tank, can improve the utilization of the energy of whole system, energy utilization can improve 10-30%.Preheating conditioning tank and multiple middle pressure steam retort combine, the processing power of system can also be substantially increased, the pond of reducing middle pressure steam retort holds, thus reduce the cost of pressurized vessel, simultaneously because increasing preheating conditioning tank to the conditioning of the organic wastes such as mud, the viscosity of the organic wastes such as mud reduces about 30%, mobility is improved, thus better mix with steam in middle pressure steam retort, react more abundant, degradable dissolved organic matter content can improve nearly 20%, thus in follow-up Anaerobic Digestion, produce the biogas more crossed, thus also avoid the deposition of the organic wastes such as mud in middle pressure steam retort, by the mud after apparatus of the present invention and method process, contrast is through the mud of thermal hydrolysis process and the mud without thermal hydrolysis process, anaerobic digestion dosing rate can improve 50%-100%, gas production rate improves 30%-120%, after anaerobic digestion dehydration, solid content can reach 30%-40%, substantially increase efficiency and the effect of sludge treatment.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, explanation clear, complete is further done to the present invention:
Fig. 1 is the structural representation of pretreatment unit of the present invention;
Fig. 2 is present invention process schema;
In figure, 1, treating material feed pipe, 2, waste hot steam main line, 3, steam injection pipeline, R1, preheating conditioning tank, R2-1, R2-2, R2-3 are steam reaction tank, R3 is that pressure release cracks tank, and F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12 are valve.
Embodiment
The invention discloses a kind of Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam and method thereof, in order to make advantage of the present invention, technical scheme clearly, clearly, below in conjunction with specific embodiment, explanation clear, complete is further done to the present invention.
As Fig. 1, shown in Fig. 2, the present invention, based on the Continuous Flow anaerobic digestion pretreatment unit of middle pressure hot steam, comprise preheating conditioning tank R1, middle pressure steam retort group and pressure release crack tank R3, wherein, middle pressure steam retort group comprises at least three middle pressure steam retort, R2-1 is respectively as the present embodiment basically illustrates three the middle pressure steam retort connected side by side, R2-2, R2-3, the middle and upper part of preheating conditioning tank R1 is provided with feed pipe entrance, this entrance is connected with treating material feed pipe 1, treating material such as mud or changing food waste enter preheating conditioning tank R1 from ingress, the side that preheating conditioning tank is relative with feed pipe entrance is provided with steam-in, steam-in is connected with waste hot steam main line 2, waste hot steam in waste hot steam main line 2 mainly comes from R2-1, R2-2, in R2-3 and R3, the middle and lower part of preheating conditioning tank is provided with discharge port, this discharge port is by each self-corresponding pipeline and R2-1, R2-2, the opening for feed of R2-3 connects, material after process in preheating conditioning tank can enter R2-1 along the pipeline of correspondence, R2-2, in R2-3,
R2-1, R2-2, R2-3 are in being set up in parallel, and the volume of each steam reaction tank is all identical, and each steam reaction tank all offers steam injection mouth in bottom, by steam injection pipeline 3 to injecting steam in steam reaction tank.
Steam enters from the bottom of R2-1, R2-2, R2-3, goes out from top, after respective exhaust line, finally flows to waste hot steam main line 2, thus enters in preheating retort.
Above-mentionedly conveniently to control, the pipeline of each correspondence is provided with valve F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11 and F12 to control steam flow or mass flow.
The present invention is by nursing one's health tank by preheating, middle pressure steam retort group and pressure release crack tank triplicity, controlled by combination, realize process continuously, mud after process or the viscosity of changing food waste can reduce between 50%-90%, also macromolecular substance can be converted into small-molecule substance simultaneously, change character and the structure of mud or organic waste, increase the content of dissolved organic matter, 100%-1000% can be improved, improve the biodegradable performance of mud and changing food waste, when anaerobic digestion is carried out again to the mud after process or changing food waste, organic matter transformation rate improves nearly more than 50%, thus obtain more biogas, realize recycling treatment.Apparatus of the present invention continuously-running, can reduce the infringement to equipment, and the recycle of waste hot steam, can realize energy-conservation, running cost reduces greatly.
Elaborate below in conjunction with the treatment process of specific embodiment to apparatus of the present invention:
Embodiment 1:
The present invention, based on the treatment process of the Continuous Flow anaerobic digestion pretreatment unit of middle pressure hot steam, it comprises the following steps:
Step 1: be 82% to water ratio by the sludge condensation of certain Sewage Plant, then be delivered continuously in preheating conditioning tank R1, the SCOD of mud is 49mg/L, viscosity is 7Mpas, the median size of mud is 47 μm, the residence time in preheating conditioning tank R1 is 30min, and the mud that preheating conditioning tank R1 flows out first carries 30min to middle pressure steam retort R2-1; Then open valve F5 shut-off valve F1, F9, continues the mud of conveying 30min to middle pressure steam retort R2-2; Finally, open valve F9 shut-off valve F1, F5, continue the mud of conveying 30min in middle pressure steam retort R2-3; Open valve F1 valve-off F5, F9 again, according to above-mentioned steps successively cyclic switching, realizes the mud of being back to back of preheating conditioning tank R1; The waste hot steam that middle pressure steam retort R2-1, R2-2, R2-3 and R3 produce is collected in waste hot steam main line 2, is then delivered in preheating conditioning tank R1 and carries out recycle, carry out pre-heat agitated conditioning, the mud temperature after conditioning 96 DEG C to mud;
Step 2: pump in the middle pressure steam retort R2-1 after mud, R2-2, R2-3 and pass into the middle pressure hot steam that pressure is about 11bar, treat that the mud temperature in each middle pressure steam retort is 155 DEG C, when pressure is 6bar, stop injecting steam, reaction times in middle pressure steam retort R2-1, R2-2, R2-3 is 30min minute, the control mode passing into steam is: keep valve F6 and F10 to close, valve F2 opens 30min; Then Open valve F6 valve-off F2 and F10, passes into 30min steam in middle pressure steam retort R2-2; Finally, Open valve F10 valve-off F2 and F6, pass into 30min steam, circulate according to this in middle pressure steam retort R2-3; The control mode of middle pressure steam retort R2-1, R2-2, R2-3 pressure release flash distillation output mud is: R2-1 passes into vapour reactor 30min, and during steam off valve F2, the control of Open valve F3, reactor R2-2 and R2-3 is with reactor R2-1;
Step 3: the mud sequence batch (in middle pressure steam retort R2-1, R2-2, R2-3 is injected into pressure release and cracks in tank R3, released vapour carries out pressure release and cracks process, is 40min in the residence time of R3, further broken macromolecular substance, reduce the particle diameter of mud, the waste hot steam of generation is got back in R1.
Moisture percentage in sewage sludge after the present embodiment process is about 84.5%, the SCOD of mud is 475mg/L, and the median size of mud is 9.5 μm, and viscosity is 2.89Mpas, carry out anaerobic digestion when the liquid mud of discharging after process is cooled to about 40 DEG C, biogas output can improve 50%.
Embodiment 2:
The present invention, based on the treatment process of the Continuous Flow anaerobic digestion pretreatment unit of middle pressure hot steam, it comprises the following steps:
Step 1: will be transported in preheating conditioning tank R1 after the kitchen waste in certain dining room sorting fragmentation, the water ratio of changing food waste is 88%, SCOD is 90348mg/L, viscosity is 3.5Mpas, median size is 100 μm, the residence time in preheating conditioning tank R1 is 30min, and the mud that preheating conditioning tank R1 flows out first carries 30min to middle pressure steam retort R2-1; Then open valve F5 shut-off valve F1 and F9, continues the changing food waste of conveying 30min to middle pressure steam retort R2-2; Last open valve F9 shut-off valve F5 and F1, continue the changing food waste of conveying 30min in middle pressure steam retort R2-3; Open valve F1 valve-off F5 and F9 again, according to above-mentioned steps successively cyclic switching, realize the changing food waste of being back to back of preheating conditioning tank R1, the waste hot steam that middle pressure steam retort R2-1, R2-2, R2-3 and R3 produce is collected in waste hot steam main line 2, then be delivered in preheating conditioning tank R1 and carry out recycle, pre-heat agitated conditioning is carried out to mud, the mud temperature after conditioning 96 DEG C.
Step 2: pump in the middle pressure steam retort R2-1 after changing food waste, R2-2, R2-3 and pass into the middle pressure hot steam that pressure is about 11bar, treat that the mud temperature in each middle pressure steam retort is 170 DEG C, when pressure is 6.5bar, stop injecting steam, reaction times in R2-1, R2-2, R2-3 is 30min minute, the control mode passing into steam is: keep valve F6 and F10 to close, valve F2 opens 30min; Then Open valve F6 valve-off F2 and F10, passes into 30min steam in middle pressure steam retort R2-2; Finally, Open valve F10 valve-off F2 and F6, pass into 30min steam, circulate according to this in middle pressure steam retort R2-3; The control mode that R2-1, R2-2, R2-3 pressure release flash distillation exports changing food waste is: R2-1 passes into vapour reactor 30min, and during steam off valve F2, the control of Open valve F3, reactor R2-2 and R2-3 is with reactor R2-1;
Mud sequence batch (in step 3:R2-1, R2-2, R2-3 is injected in R3, and released vapour carries out pressure release and cracks process, and the residence time of R3 is 50min, further broken macromolecular substance, and reduce the particle diameter of mud, the waste hot steam of generation is got back in R1.
Changing food waste water ratio after the present embodiment process is about 90.5%, and the SCOD of mud is 194759mg/L, and median size is 15 μm, and viscosity is 1.3Mpas; Carry out anaerobic digestion when the liquid mud of discharging after process is cooled to about 40 DEG C, biogas output can improve 90%.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that the claims in the present invention protect; can also make the various deformation such as replacement, simple combination, request protection domain of the present invention should be as the criterion with claims.
Claims (7)
1. the Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam, it comprises middle pressure steam retort group and pressure release cracks tank, it is characterized in that: also comprise preheating conditioning tank, described preheating conditioning tank is for holding pending material, steam-in is provided with above the side of described preheating conditioning tank, steam in described middle pressure steam retort group enters in preheating conditioning tank by described steam-in, the discharge port of described preheating conditioning tank is communicated with the opening for feed of described middle pressure steam retort, the discharge port of described middle pressure steam retort group is communicated with the opening for feed that described pressure release cracks tank, described steam reaction tank group comprises the steam reaction tank of at least three arranged in parallel, wherein, the opening for feed of each steam reaction tank is all connected with the discharge port that tank is nursed one's health in described preheating by corresponding pipeline, and the discharge port of each steam reaction tank is all connected with the opening for feed that described pressure release cracks tank by corresponding pipeline.
2. the Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam according to claim 1, is characterized in that: opening for feed and the preheating of each steam reaction tank are nursed one's health to crack on pipeline that tank discharge port is connected, with pressure release on pipeline that tank opening for feed is connected and be provided with valve.
3. the Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam according to claim 1, it is characterized in that: described steam reaction tank group is injecting steam wherein from bottom, the vapour outlet at described steam reaction tank group top is connected on main line through respective outlet branch road, the steam-in that tank is nursed one's health in one end and the preheating of described main line is connected, and the steam-in that the other end and pressure release crack tank top is connected.
4. the Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam according to claim 1, is characterized in that: the pipeline that described preheating conditioning tank opening for feed place connects is provided with fresh feed pump, by described fresh feed pump, mixing of materials is even.
5. the treatment process of the Continuous Flow anaerobic digestion pretreatment unit based on middle pressure hot steam according to any one of claim 1-4, is characterized in that, comprise the following steps successively:
A, first in each steam reaction tank, pass into steam, control makes steam enter in preheating conditioning tank through main line, pending material is sent in preheating conditioning tank through fresh feed pump, by described steam, material is wherein heated, the residence time of material in preheating conditioning tank is 15-30min, and temperature controls as 94-98 DEG C;
B, the material after step a process is injected middle pressure steam retort group, it injects described material successively by by-pass valve control in each middle pressure steam retort, wherein, middle pressure steam retort keeps intermittent operation mode, in middle pressure steam retort, temperature is 130-190 DEG C, and the treatment time is 15-30min;
C, by after step b process material inject pressure release crack in tank, the treatment time is 15-60min, control temperature 100 DEG C-103 DEG C, pressure 0.1-0.15MPa.
6. treatment process according to claim 5, is characterized in that: its viscosity of the material after step a process reduces 10-30%, and its viscosity of the material after step b process reduces 50-80%; Mud particle diameter after step c process reduces 30%-80%.
7. treatment process according to claim 5, is characterized in that: in step a, and the water ratio for the treatment of material is 80-90%.
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| CN105366901A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Sludge treatment method improving dehydration efficiency |
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| CN105366902A (en) * | 2015-12-15 | 2016-03-02 | 晋江市世龙厨房设备有限公司 | Sludge treatment method with improved dehydration performance |
| CN109553272A (en) * | 2019-01-17 | 2019-04-02 | 上海蓝州环保科技有限公司 | A kind of sludge treatment equipment and its processing method |
| CN114558879A (en) * | 2022-03-29 | 2022-05-31 | 北京洁绿环境科技股份有限公司 | Kitchen waste pyrohydrolysis device and method |
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