CN112624554A - Pyrolysis equipment and system with same for treating sludge - Google Patents
Pyrolysis equipment and system with same for treating sludge Download PDFInfo
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- CN112624554A CN112624554A CN202011463724.1A CN202011463724A CN112624554A CN 112624554 A CN112624554 A CN 112624554A CN 202011463724 A CN202011463724 A CN 202011463724A CN 112624554 A CN112624554 A CN 112624554A
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- pyrolysis
- hot air
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- inner barrel
- barrel
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 161
- 239000010802 sludge Substances 0.000 title claims abstract description 54
- 229920002456 HOTAIR Polymers 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000002296 pyrolytic carbon Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 45
- 239000000463 material Substances 0.000 claims description 45
- 238000001035 drying Methods 0.000 claims description 32
- 238000002485 combustion reaction Methods 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000003546 flue gas Substances 0.000 claims description 13
- 239000000446 fuel Substances 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 description 8
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONAGEOUS 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 CARBONAGEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
-
- 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
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The invention discloses pyrolysis equipment and a system for treating sludge with the same, wherein the pyrolysis equipment comprises: the device comprises an inner cylinder, a rotating shaft and an outer cylinder, wherein a feed inlet is formed in one end of the inner cylinder, and a pyrolytic carbon outlet and a pyrolytic oil gas outlet are formed in the other end of the inner cylinder; the rotating shaft is rotatably arranged and extends into the inner barrel from one end of the inner barrel along the length direction of the inner barrel, the rotating shaft is provided with a helical blade and a heating element, and the helical blade is provided with a soft contact element; the outer barrel is sleeved on the inner barrel, a high-temperature hot air channel is formed between the inner barrel and the outer barrel, a high-temperature hot air inlet is formed in one end of the outer barrel, and a hot air outlet after heat exchange is formed in the other end of the outer barrel. This pyrolysis equipment dynamic seal effect preferred to adopt this equipment to carry out the pyrolysis to mud and have higher pyrolysis efficiency.
Description
Technical Field
The invention belongs to the field of pyrolysis, and particularly relates to pyrolysis equipment and a sludge treatment system with the same.
Background
The sludge pyrolysis is generally carried out under the anaerobic atmosphere, the sludge pyrolysis is a process of decomposing organic matters in the sludge into pyrolytic carbon, pyrolysis gas and trace tar, and the sludge pyrolysis has the advantages of harmlessness, thorough reduction, environmental friendliness, high recycling degree and the like. For example, because the pyrolytic carbon has more micropores and specific surface area, and simultaneously contains higher fixed carbon content and abundant nutrients such as N, P, K, the pyrolytic carbon can be used as a functional material in various industries.
Currently, sludge pyrolysis is generally performed by means of different rotary kilns. However, the rotary kiln generally adopts the outer cylinder to rotate, the energy consumption of the mode is high, the dynamic sealing of the kiln head and the kiln tail is difficult, and the anaerobic environment in the furnace body cannot be ensured, so that the sludge is pyrolyzed and becomes anoxic combustion, and harmful substances such as dioxin cannot be generated. And the heating effect of the conventional pyrolysis equipment is poor, so that the sludge pyrolysis speed is low.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a pyrolysis apparatus and a system for treating sludge having the same, wherein the pyrolysis apparatus has a good dynamic sealing effect, and has a high pyrolysis efficiency for pyrolyzing sludge by using the apparatus.
In one aspect of the invention, a pyrolysis apparatus is provided. According to an embodiment of the invention, the pyrolysis apparatus comprises:
the device comprises an inner cylinder, a feed inlet is formed in one end of the inner cylinder, and a pyrolytic carbon outlet and a pyrolytic oil gas outlet are formed in the other end of the inner cylinder;
the rotating shaft is rotatably arranged and extends into the inner barrel from one end of the inner barrel along the length direction of the inner barrel, a helical blade and a heating element are arranged on the rotating shaft, and a soft contact element is arranged on the helical blade;
the outer barrel is sleeved on the inner barrel, a high-temperature hot air channel is formed between the inner barrel and the outer barrel, a high-temperature hot air inlet is formed in one end of the outer barrel, and a hot air outlet after heat exchange is formed in the other end of the outer barrel.
According to the pyrolysis equipment provided by the embodiment of the invention, the rotatable rotating shaft is arranged in the inner barrel, the outer barrel is sleeved on the inner barrel, high-temperature hot air is supplied into the high-temperature hot air channel formed between the inner barrel and the outer barrel, namely, heat is supplied into the inner barrel in an indirect heat exchange mode to heat materials, the rotating shaft is provided with the spiral blade and the heating element, the spiral blade stirs the materials in the inner barrel and forwards the materials along with the rotation of the rotating shaft, the problem of difficult dynamic sealing of a kiln head and a kiln tail caused by the rotation of the outer barrel of the conventional rotary kiln is avoided, so that harmful substances such as dioxin and the like generated by the inner barrel are reduced, meanwhile, the soft contact element is arranged on the spiral blade, the effective turning of the materials in a gap between the spiral blade and the wall of the inner barrel is ensured, the contact area between the materials and the barrel is effectively improved, and, in addition, the heating element arranged on the rotating shaft can heat the rotating shaft and transfer heat to the material in the inner barrel through the rotating shaft, so that the pyrolysis efficiency of the material in the inner barrel is improved. From this, adopt this equipment to carry out the pyrolysis to mud, can improve the pyrolysis efficiency of mud when realizing the mud resourceization.
In addition, the pyrolysis apparatus according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the present invention, a circle of the spiral blade is taken as a section, the spiral blade is disposed between two adjacent sections, and a plurality of soft contacts are disposed between the two adjacent sections. Therefore, effective turning of materials in the gap between the helical blade and the inner cylinder wall is guaranteed.
In some embodiments of the invention, the lowermost end of the soft contact is in contact with the wall of the inner barrel. Therefore, effective turning of materials in the gap between the helical blade and the inner cylinder wall is guaranteed.
In some embodiments of the invention, the soft contact comprises a chain. Therefore, effective turning of materials in the gap between the helical blade and the inner cylinder wall is guaranteed.
In some embodiments of the invention, the heating element comprises a resistance wire, the shaft is hollow to form a cavity, and the resistance wire is received in the cavity.
In some embodiments of the present invention, the distance between the helical blade and the inner cylinder is 15-50 mm.
In some embodiments of the invention, a baffle plate is arranged in the high-temperature hot air channel. Therefore, the pyrolysis efficiency of the materials in the inner barrel is improved.
In some embodiments of the invention, the inner wall of the outer barrel is provided with an insulating layer. Therefore, the heat loss in the high-temperature hot air channel can be reduced.
In yet another aspect of the invention, a system for treating sludge is provided. According to an embodiment of the present invention, the system for treating sludge includes:
a drying device having a sludge inlet and a dried sludge outlet;
the device comprises a pre-pyrolysis device and a pyrolysis device, wherein at least one of the pre-pyrolysis device and the pyrolysis device is the pyrolysis equipment, a feed inlet on the pre-pyrolysis device is connected with a dried sludge outlet, and a feed inlet on the pyrolysis device is connected with a pre-pyrolyzed material outlet on the pre-pyrolysis device;
the hot-blast furnace, the hot-blast furnace has combustor, pyrolysis oil gas entry, fuel entry, primary air entry and burning flue gas export, pyrolysis oil gas entry with pyrolysis oil gas export on the pyrolysis device links to each other, burning flue gas export with the pyrolysis device links to each other.
According to the system for treating the sludge, the sludge is dried and then sequentially supplied to the preheating decomposition device and the pyrolysis device for treatment, at least one of the preheating decomposition device and the pyrolysis device adopts the pyrolysis equipment with good dynamic sealing effect and high pyrolysis efficiency, the pyrolysis efficiency of the sludge can be improved, then pyrolysis oil gas obtained from the pyrolysis device is supplied to the hot blast stove to be mixed with fuel and primary air for combustion, and the generated combustion flue gas is supplied to the pyrolysis device for utilization, so that the energy consumption of the system is reduced.
In addition, the system for treating sludge according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the present invention, the preheating device and the pyrolysis device are the above pyrolysis apparatus, the combustion flue gas outlet is connected to a high-temperature hot air inlet on the pyrolysis device, a hot air outlet after heat exchange on the pyrolysis device is connected to the high-temperature hot air inlet on the preheating device, a hot air outlet after heat exchange on the preheating device is connected to the drying device, and a cold drying air outlet on the drying device is connected to the hot blast stove and a circulating air inlet on the drying device. Therefore, the resource utilization of heat can be realized, and the energy consumption of the system is reduced.
In some embodiments of the present invention, the above system for treating sludge further comprises: the washing device is provided with a gas inlet to be purified and a gas outlet after purification, the pyrolysis oil gas outlet on the pre-pyrolysis device is connected with the gas inlet to be purified, and the gas outlet after purification is connected with the primary air inlet.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of a pyrolysis apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for treating sludge according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a system for treating sludge according to still another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one aspect of the invention, a pyrolysis apparatus is provided. According to an embodiment of the present invention, referring to fig. 1, the pyrolysis apparatus includes an inner drum 100, a rotation shaft 200, and an outer drum 300.
According to the pyrolysis apparatus of the embodiment of the present invention, referring to fig. 1, one end of an inner cylinder 100 is provided with a feed port 101, and the other end of the inner cylinder 100 is provided with a pyrolytic carbon outlet 102 and a pyrolytic oil gas outlet 103. Specifically, the inner cylinder 100 is fixed, the sludge is dried (the water content of the dried sludge is lower than 20 wt%) and then is sent to the sealed screw feeder 11 through one or more of a pipe chain machine (not shown), a scraper machine (not shown) and a screw conveyor (not shown), namely, an anaerobic environment in the inner cylinder 100 is ensured, generation of harmful substances such as dioxin is reduced, the screw feeder 11 supplies the sludge to the inner cylinder 100 through the feed inlet 101 for pyrolysis in the anaerobic environment, pyrolytic carbon generated by pyrolysis is discharged through a pyrolytic carbon outlet 102, simultaneously generated pyrolytic tar and pyrolytic gas are discharged through a pyrolytic oil gas outlet 103 and enter a spiral discharging machine (not shown) or a slag cooler (not shown) with a cooling jacket, the cooled tar and the pyrolytic gas enter a carbon bin for storage, and a cooling medium of the cooling jacket is circulating cooling water.
According to an embodiment of the present invention, referring to fig. 1, a rotation shaft 200 is rotatably disposed, and the rotation shaft 200 extends into the inner cylinder 100 from one end of the inner cylinder 100 along a length direction of the inner cylinder 100, a helical blade 21 and a heating member (not shown) are disposed on the rotation shaft 200, and a soft contact member 211 is disposed on the helical blade 21. Specifically, the rotating shaft 200 is driven by an external power device 22 (such as a motor) to rotate, and along with the rotation of the rotating shaft 200, the helical blades 21 stir the materials in the inner cylinder 100 and push the materials forward, so that the problem of difficult dynamic sealing of the kiln head and the kiln tail caused by the rotation of the outer cylinder of the existing rotary kiln is avoided, thereby reducing harmful substances such as dioxin and the like generated by the inner cylinder 100, simultaneously, the soft contact piece 211 is arranged on the helical blade 21, the effective turnover of the gap materials between the helical blade 21 and the wall of the inner cylinder 100 is ensured, the contact area of the materials and the cylinder is effectively improved, the scratch problem caused by the thermal expansion of the helical blade 21 and the cylinder of the inner cylinder 100 can be avoided, in addition, a heating member (not shown) provided on the rotation shaft 200 may heat the rotation shaft 200, and transfers heat to the material in the inner drum 100 through the rotation shaft 200, thereby improving the pyrolysis efficiency of the material in the inner drum 100.
Further, referring to fig. 1, a circle of the spiral blade 21 is taken as a section, the spiral blade 211 is arranged between two adjacent sections, and a plurality of soft contact pieces 211 are arranged between the two adjacent sections, preferably, the lowest end of the soft contact piece 211 is in contact with the wall of the inner cylinder 100, that is, the soft contact piece 211 is adopted to turn over materials which cannot be contacted by the spiral blade 211, so that not only can the heat transfer efficiency be improved, but also the rubbing and scraping of a common shoveling plate caused by the contact between the thermal expansion and the wall of the inner cylinder can be avoided, and more preferably, the soft contact piece 211 is a chain. It should be noted that "the lowest end of the soft contact member 211" is understood to be the position where the soft contact member 211 is located at the lowest end in the inner cylinder as the spiral blade 21 rotates.
Further, the distance between the spiral blade 21 and the inner cylinder 100 is 15-50 mm, so that the accumulation of materials at the bottom of the inner cylinder 100 is reduced as much as possible, and the scratch of the spiral blade 21 caused by thermal expansion is overcome.
Further, a heating member (not shown) is disposed in the rotating shaft 200, that is, the rotating shaft 200 is heated by the heating member, and preferably, the spiral blade 21 is a heat transfer member, that is, heat generated by the heating member can be transferred to the spiral blade 21 through the rotating shaft 200, thereby improving the pyrolysis efficiency of the material in the inner tube 100. Preferably, the heating member (not shown) is a resistance wire. Specifically, the rotating shaft 200 is hollow to form a cavity, and the resistance wires are uniformly accommodated in the cavity, namely, the rotating shaft 200 is heated through the resistance wires, so that the pyrolysis efficiency of the materials in the inner barrel 100 is improved.
According to an embodiment of the present invention, referring to fig. 1, the outer cylinder 300 is sleeved on the inner cylinder 200, and a high-temperature hot air channel 31 is formed between the inner cylinder 200 and the outer cylinder 300, one end of the outer cylinder 300 is provided with a high-temperature hot air inlet 301, and the other end of the outer cylinder 300 is provided with a hot air outlet 302 after heat exchange, that is, heat is supplied into the inner cylinder 100 by indirect heat exchange to heat the material. Specifically, the outer cylinder 300 and the inner cylinder 100 are both fixedly arranged, so that the problem of difficulty in dynamic sealing of a kiln head and a kiln tail caused by rotation of the outer cylinder of the existing rotary kiln is solved, and harmful substances such as dioxin and the like generated by the inner cylinder are reduced. Meanwhile, in order to improve the heat exchange efficiency between the high-temperature hot air in the high-temperature hot air channel 31 and the inner cylinder 100, a baffle plate (not shown) is preferably arranged in the high-temperature hot air channel 31, that is, the disturbance and the retention time of the high-temperature hot air in the high-temperature hot air channel 31 are increased. Further, an insulating layer (not shown) is disposed on a sidewall of the outer tube 300 to prevent heat from being transferred to the outside, thereby improving heat transfer efficiency to the inner tube 100.
According to the pyrolysis equipment provided by the embodiment of the invention, the rotatable rotating shaft is arranged in the inner barrel, the outer barrel is sleeved on the inner barrel, high-temperature hot air is supplied into the high-temperature hot air channel formed between the inner barrel and the outer barrel, namely, heat is supplied into the inner barrel in an indirect heat exchange mode to heat materials, the rotating shaft is provided with the spiral blade and the heating element, the spiral blade stirs the materials in the inner barrel and forwards the materials along with the rotation of the rotating shaft, the problem of difficult dynamic sealing of a kiln head and a kiln tail caused by the rotation of the outer barrel of the conventional rotary kiln is avoided, so that harmful substances such as dioxin and the like generated by the inner barrel are reduced, meanwhile, the soft contact element is arranged on the spiral blade, the effective turning of the materials in a gap between the spiral blade and the wall of the inner barrel is ensured, the contact area between the materials and the barrel is effectively improved, and, in addition, the heating element arranged on the rotating shaft can heat the rotating shaft and transfer heat to the material in the inner barrel through the rotating shaft, so that the pyrolysis efficiency of the material in the inner barrel is improved. From this, adopt this equipment to carry out the pyrolysis to mud, can improve the pyrolysis efficiency of mud when realizing the mud resourceization.
As described above, the pyrolysis apparatus according to the embodiment of the present invention has an advantageous effect of at least one of:
(1) the contact area of the materials is increased: the heating element is arranged on the rotating shaft, so that the temperature of the rotating shaft can be controlled, the contact area of the material with the rotating shaft and the inner cylinder wall is increased to the maximum extent, and the heat transfer efficiency is improved;
(2) avoid equipment to cut and rub: the chain is arranged on the spiral blade, so that bottom materials which cannot be contacted with the spiral blade can be turned, and meanwhile, due to the active connection of the chain and the spiral blade, the hard scraping and rubbing between the chain and the cylinder wall caused by thermal expansion can be avoided, and the problem that two problems that a heat exchange surface cannot be updated and equipment cannot be scraped and rubbed between a common shoveling plate and a conveying device and the inner cylinder wall cannot be solved is thoroughly solved;
(3) the mode of inner shaft rotation is adopted, so that the integral rotation of the whole outer cylinder loaded with materials and other systems is avoided, and the power consumption of the system is reduced.
In yet another aspect of the invention, a system for treating sludge is provided. According to an embodiment of the invention, with reference to fig. 2, the system comprises: a drying device 400, a pre-pyrolysis device 500, a pyrolysis device 600 and a hot blast stove 700.
According to an embodiment of the invention, referring to fig. 2, the drying device 400 has a sludge inlet 401 and a dried sludge outlet 402 and is adapted to perform a drying process on the sludge so as to obtain a dried sludge. Specifically, the sludge with the water content not higher than 60 wt% is lifted from the sludge bin 41 to the slitter 42 at the top end of the drying device 400 through a scraper conveyor (not shown), and is fed into the sludge inlet 401 of the drying device 400 after being slit, and the sludge enters the drying device 400, moves along the axial direction under the pushing of the screw conveyor along with the rotation of the rotating shaft, and is finally discharged from the dried sludge outlet 402. Preferably, the drying of the sludge in the drying device 400 is indirect heat exchange, that is, a ring-shaped housing (not shown) is arranged on the periphery of the furnace chamber of the drying device 400, and a spiral baffle plate (not shown) is arranged in the ring-shaped housing, that is, dry hot air is supplied into the ring-shaped housing, the sludge in the ring-shaped housing is heated and dried through the heat exchange between the dry hot air and the furnace chamber of the drying device 400, dry cold air obtained after the heat exchange escapes from a dry cold air outlet 403 on the drying device 400, and a part of the dry cold air enters the furnace chamber of the drying device 400 through a circulating air inlet 404 on the drying device 400 to directly contact and exchange heat with the sludge, so as to improve the thermal efficiency of the system and the drying efficiency of the drying device 400 to the maximum extent, wherein the gas exiting from the furnace chamber of the drying device 400 directly enters a tail gas treatment, wherein, the inlet temperature of the drying hot air: 200 ℃ and 400 ℃, and the outlet temperature of the drying cold air: 200-300 ℃, furnace outlet gas temperature: 80-150 ℃, material residence time: 40-120 min.
According to an embodiment of the present invention, referring to fig. 2, at least one of the pre-pyrolysis device 500 and the pyrolysis device 600 is the pyrolysis apparatus described above, the feed port 501 of the pre-pyrolysis device 500 is connected to the dried sludge outlet 402, the feed port 601 of the pyrolysis device 600 is connected to the pre-pyrolyzed material outlet 502 of the pre-pyrolysis device 500, and the dried sludge obtained by the drying device 400 is sequentially fed to the pre-pyrolysis device 500 and the pyrolysis device 600 for treatment. Preferably, the pre-pyrolysis apparatus 500 and the pyrolysis apparatus 600 are pyrolysis apparatuses having the above-described structure.
Specifically, the pre-pyrolysis hot air enters the high-temperature hot air channel 51 of the pre-pyrolysis device 500 through the high-temperature hot air inlet 503 on the pre-pyrolysis device 500 and flows along the spiral baffle plate therein, the dried sludge enters the pre-pyrolysis device 500 through the feed inlet 501 on the pre-pyrolysis device 500 and then is pushed forward under the action of the spiral blade, the supplied pre-pyrolysis hot air exchanges heat with the inner cylinder indirectly, the moisture in the sludge is further reduced, the dried sludge is finally discharged from the pre-pyrolysis material outlet 502 on the pre-pyrolysis device 500 and then is supplied to the pyrolysis device 600 through the feed inlet 601 on the pyrolysis device 600, the hot air outlet 504 after heat exchange on the pre-pyrolysis device 500 is connected with the drying device 400, namely, the hot air after heat exchange escapes from the hot air outlet 504 after heat exchange on the pre-pyrolysis device 500 and then is supplied to the ring-ring shell on the drying device 400 as dry hot air, a small amount of pyrolysis oil gas is generated by pyrolysis of the sludge in the, the gas in the pyrolysis oil gas is CO2For the owner, contain partial VOCs, wherein, preheat 500 hot-blast inlet temperatures of decomposing device high temperature: 500 ℃ and 650 ℃ hot air outlet after heat exchangeTemperature: 250 ℃ and 450 ℃, material residence time: 40-120 min. The material obtained by the pre-pyrolysis device 500 is discharged from a material outlet 502 on the pre-pyrolysis device 500 and then enters the pyrolysis device 600 through a feed inlet 601 on the pyrolysis device 600, the high-temperature hot air enters a high-temperature hot air channel 61 of the pyrolysis device 600 through a high-temperature hot air inlet 602 on the pyrolysis device 600 and flows along a spiral baffle plate in the high-temperature hot air channel, pyrolysis is completed in the pyrolysis device 600, the produced pyrolysis oil gas is discharged through a pyrolysis oil gas outlet 603 on the pyrolysis device 600, the pyrolysis carbon is discharged from a pyrolysis carbon outlet 604 of the pyrolysis device 600 and then enters a sealed water-cooling spiral (conventional equipment, not shown), the temperature is reduced and then conveyed into a carbon bin (conventional equipment, not shown) for standby, a hot air outlet 605 after heat exchange on the pyrolysis device 600 is connected with a high-temperature hot air inlet 503 on the pre-pyrolysis device 500, namely, the hot air obtained by the high-temperature hot air channel 61 after heat exchange is discharged through a hot air outlet 605 after heat, wherein, the temperature of the high-temperature hot air in the pyrolysis apparatus 600: 700 ℃ and 900 ℃, the hot air temperature after heat exchange is as follows: 500 ℃ and 650 ℃; the retention time of the materials is as follows: 40-90min, rotating shaft temperature: 450 ℃ and 600 ℃.
According to an embodiment of the present invention, referring to fig. 2, the hot blast stove 700 has a burner 71, a pyrolysis oil gas inlet 701, a fuel inlet 702, a primary air inlet 703 and a combustion flue gas outlet 704, the pyrolysis oil gas inlet 701 is connected to a pyrolysis oil gas outlet 603 on the pyrolysis apparatus 600 and is adapted to supply pyrolysis oil gas obtained by the pyrolysis apparatus 600 into the hot blast stove 700 to be mixed with fuel and primary air for combustion, so as to obtain combustion flue gas, meanwhile, the burner 71 adjusts the fuel usage amount based on the temperature of the combustion flue gas outlet 704 and provides a long open fire for the system, and the combustion flue gas outlet 704 is connected to a high-temperature hot air inlet 602 on the pyrolysis apparatus 600, that is, the combustion flue gas obtained by the hot blast stove 700 enters the high-temperature hot air channel 61 of the pyrolysis apparatus 600 through the high-temperature hot air inlet 602 on. Meanwhile, the dry cold air outlet 403 of the drying device 400 is connected to the hot blast stove 700, that is, another part of the dry cold air obtained in the drying device 400 is supplied to the hot blast stove 700 to participate in combustion.
According to the system for treating the sludge, the sludge is dried and then sequentially supplied to the preheating decomposition device and the pyrolysis device for treatment, at least one of the preheating decomposition device and the pyrolysis device adopts the pyrolysis equipment with good dynamic sealing effect and high pyrolysis efficiency, the pyrolysis efficiency of the sludge can be improved, then pyrolysis oil gas obtained from the pyrolysis device is supplied to the hot blast stove to be mixed with fuel and primary air for combustion, and the generated combustion flue gas is supplied to the pyrolysis device for utilization, so that the energy consumption of the system is reduced.
Further, referring to fig. 3, the system further includes: washing device 800, washing device 800 has and treats that gas inlet 801 and the gas outlet 802 after purifying, preheat pyrolysis oil gas export 505 on the pyrolysis device 500 and treat that gas inlet 801 links to each other, gas outlet 802 links to each other with a wind entry 703 after purifying, and be suitable for and carry out the water washing with the trace pyrolysis oil gas that obtains in the above-mentioned pyrolysis device 500 in advance and handle, gas after the purification discharges the back and enters into the primary air pipeline of hot-blast furnace 700 through a wind entry 703, finally get into hot-blast furnace 700 and burn, make VOCs realize decomposing completely, reduce tail gas processing system's the processing degree of difficulty, be favorable to environmental protection index's reduction.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A pyrolysis apparatus, comprising:
the device comprises an inner cylinder, a feed inlet is formed in one end of the inner cylinder, and a pyrolytic carbon outlet and a pyrolytic oil gas outlet are formed in the other end of the inner cylinder;
the rotating shaft is rotatably arranged and extends into the inner barrel from one end of the inner barrel along the length direction of the inner barrel, a helical blade and a heating element are arranged on the rotating shaft, and a soft contact element is arranged on the helical blade;
the outer barrel is sleeved on the inner barrel, a high-temperature hot air channel is formed between the inner barrel and the outer barrel, a high-temperature hot air inlet is formed in one end of the outer barrel, and a hot air outlet after heat exchange is formed in the other end of the outer barrel.
2. The pyrolysis apparatus of claim 1, wherein one segment is a spiral on one circle of the spiral blade, the spiral blade is arranged between two adjacent segments, and a plurality of the soft contacts are arranged between the two adjacent segments.
3. The pyrolysis apparatus of claim 2, wherein a lowermost end of the soft contact is in contact with a wall of the inner barrel.
4. The pyrolysis apparatus of any one of claims 1 to 3, wherein the soft contact comprises a chain.
5. A pyrolysis apparatus as claimed in claim 1 wherein the heating element comprises a resistance wire, the shaft being hollow to form a cavity in which the resistance wire is received.
6. The pyrolysis apparatus of claim 1, wherein the helical blade is spaced from the inner barrel by a distance of 15 to 50 mm.
7. A system for treating sludge, comprising:
a drying device having a sludge inlet and a dried sludge outlet;
a pre-pyrolysis device and a pyrolysis device, wherein at least one of the pre-pyrolysis device and the pyrolysis device is the pyrolysis equipment in any one of claims 1 to 6, a feed inlet on the pre-pyrolysis device is connected with the dried sludge outlet, and a feed inlet on the pyrolysis device is connected with a pre-pyrolyzed material outlet on the pre-pyrolysis device;
the hot-blast furnace, the hot-blast furnace has combustor, pyrolysis oil gas entry, fuel entry, primary air entry and burning flue gas export, pyrolysis oil gas entry with pyrolysis oil gas export on the pyrolysis device links to each other, burning flue gas export with the pyrolysis device links to each other.
8. The system according to claim 7, wherein the pre-pyrolysis device and the pyrolysis device are the pyrolysis apparatus according to any one of claims 1 to 6, the combustion flue gas outlet is connected to a high-temperature hot air inlet on the pyrolysis device, a hot air outlet after heat exchange on the pyrolysis device is connected to a high-temperature hot air inlet on the pre-pyrolysis device, a hot air outlet after heat exchange on the pre-pyrolysis device is connected to the drying device, and a dry cold air outlet on the drying device is connected to the hot blast stove and a circulating air inlet on the drying device.
9. The system of claim 8, further comprising:
the washing device is provided with a gas inlet to be purified and a gas outlet after purification, the pyrolysis oil gas outlet on the pre-pyrolysis device is connected with the gas inlet to be purified, and the gas outlet after purification is connected with the primary air inlet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113548784A (en) * | 2021-08-26 | 2021-10-26 | 北京中科国通环保工程技术股份有限公司 | Method and device for efficient sludge heat drying treatment |
| CN114538728A (en) * | 2022-04-19 | 2022-05-27 | 北京汇潮云集科技有限公司 | Sludge treatment system and sludge treatment method |
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2020
- 2020-12-11 CN CN202011463724.1A patent/CN112624554A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113548784A (en) * | 2021-08-26 | 2021-10-26 | 北京中科国通环保工程技术股份有限公司 | Method and device for efficient sludge heat drying treatment |
| CN114538728A (en) * | 2022-04-19 | 2022-05-27 | 北京汇潮云集科技有限公司 | Sludge treatment system and sludge treatment method |
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