CN114772776A - Rotational flow suspension type supercritical water oxidation reactor - Google Patents
Rotational flow suspension type supercritical water oxidation reactor Download PDFInfo
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- CN114772776A CN114772776A CN202210342853.8A CN202210342853A CN114772776A CN 114772776 A CN114772776 A CN 114772776A CN 202210342853 A CN202210342853 A CN 202210342853A CN 114772776 A CN114772776 A CN 114772776A
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- 238000009284 supercritical water oxidation Methods 0.000 title claims abstract description 44
- 239000000725 suspension Substances 0.000 title claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 239000010815 organic waste Substances 0.000 claims abstract description 61
- 238000002347 injection Methods 0.000 claims abstract description 55
- 239000007924 injection Substances 0.000 claims abstract description 55
- 239000000446 fuel Substances 0.000 claims abstract description 29
- 239000000498 cooling water Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000012466 permeate Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 abstract description 17
- 150000003839 salts Chemical class 0.000 abstract description 14
- 239000007795 chemical reaction product Substances 0.000 abstract description 12
- 238000000926 separation method Methods 0.000 abstract description 12
- 238000006731 degradation reaction Methods 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000008021 deposition Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 28
- 239000002245 particle Substances 0.000 description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000012530 fluid Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 238000001816 cooling Methods 0.000 description 7
- 229910017053 inorganic salt Inorganic materials 0.000 description 7
- 229910001868 water Inorganic materials 0.000 description 7
- 239000000376 reactant Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 238000010525 oxidative degradation reaction Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 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 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012454 non-polar solvent Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
- C02F1/385—Treatment of water, waste water, or sewage by centrifugal separation by centrifuging suspensions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/003—Coaxial constructions, e.g. a cartridge located coaxially within another
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
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Abstract
The invention discloses a rotational flow suspension type supercritical water oxidation reactor, which comprises: the pressure-bearing shell body and the porous interior casing that coaxial cooperation set up, the pressure-bearing shell body includes: a top cap, an upper cylindrical section and a lower conical section; the first air injection pipe is arranged in the middle of the upper cylindrical section; the fuel injection pipe and the second air injection pipe are arranged at the top of the lower conical section, are uniformly arranged on the same horizontal circumference at intervals, and are oppositely input by a distance r of two parallel deviations from the central shaft of the pressure-bearing outer shell; the organic waste liquid input pipe is arranged at the upper part of the lower conical section, and the input direction of the organic waste liquid input pipe inclines upwards and points to the central shaft of the pressure-bearing outer shell. By adopting the technical scheme, the organic waste liquid is efficiently and quickly preheated, the efficient degradation of the organic waste liquid is guaranteed, the corrosion resistance and the salt deposition resistance are good, the gas-solid separation of reaction products can be realized, and the overall energy recovery efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of supercritical water oxidation equipment, in particular to a rotational flow suspension type supercritical water oxidation reactor.
Background
The treatment of high-concentration, toxic and nondegradable organic wastewater is a well-known technical problem at home and abroad. The traditional organic wastewater treatment technology (such as physical and chemical treatment technology, biological treatment technology, wet oxidation, incineration and the like) has the problems of high cost, low degradation rate, easy derivation of secondary pollution and the like. Supercritical Water Oxidation (SCWO), which is a novel technology for treating organic wastewater, is one of the methods for effectively solving the problem. Supercritical water oxidation is a method of oxidizing organic substances by "burning" with air or another oxidizing agent under high-temperature and high-pressure conditions exceeding the critical point of water (PC: 22.1MPa, TC: 374 ℃). The polarity of water is a function of temperature and pressure, and supercritical water is a non-polar solvent. In superUnder the environment of critical water, organic matters and gas can be completely dissolved mutually, the phase interface of gas phase and liquid phase disappears, a homogeneous phase system is formed, and the reaction speed is greatly accelerated. Over 99.9% of the organics are rapidly combusted to CO in a residence time of less than 1 minute or even a few seconds2、H2O and other non-toxic and harmless end products. The reaction temperature is generally 400-650 ℃, SO that SO is avoided2、NOxAnd secondary pollutants such as dioxin.
Although the homogeneous supercritical water oxidation reaction can rapidly degrade organic matters, organic waste liquid with high solid content, high salt content or high solid content and high salt content increases heat and mass transfer in the process due to the existence of solid phase particles and inorganic salt precipitated in the reaction process, further hinders the reaction process, and the reaction process needs to be strengthened to achieve thorough degradation of the organic matters.
In the prior art, when supercritical water oxidation technology is adopted to treat organic waste liquid with high solid content, high salt content or high solid content and high salt content, the following technical defects exist: (1) in the heat recovery process, the heat exchange efficiency of the heat exchange device is low; (2) solid ash and precipitated inorganic salt in the organic waste liquid are easy to deposit and block, and the safe operation of the system is influenced; (3) organic waste liquid with high-concentration particles is easy to scale and block in a preheating section, supercritical water oxidation reaction is carried out quickly through auxiliary fuel to form hot liquid flame, product waste can be quickly preheated through heat released by the flame, but the sufficient and efficient mixing of the flame and the waste affects the sufficient preheating of the material and the subsequent degradation reaction; (4) solid phase particles or precipitated inorganic salts in the organic waste liquid are easy to accumulate, heat and mass transfer resistance is obviously increased, and the supercritical water oxidation reaction efficiency is not high, the conventional solution method is stirred in a reactor by means of mechanical means or through ultra-long reaction residence time, however, a stirring device is difficult to install and seal under the supercritical water oxidation reaction condition, and the ultra-long reaction residence time easily causes the size and investment of the reactor to be overlarge.
Disclosure of Invention
In view of the above, there is a need to provide a cyclone suspension type supercritical water oxidation reactor, which is used for treating an organic waste liquid containing high content of solids, high content of salts, or both high content of solids and high content of salts, so as to realize efficient and rapid preheating of the organic waste liquid, ensure efficient degradation of the organic waste liquid, have good corrosion resistance and salt deposition resistance, can realize gas-solid separation of reaction products, and greatly improve the overall energy recovery efficiency.
In order to realize the purpose, the invention adopts the following technical scheme:
a cyclone suspension type supercritical water oxidation reactor, comprising: the pressure-bearing shell body and the porous interior casing that coaxial cooperation set up, the pressure-bearing shell body includes: the top cover, the upper cylindrical section and the lower conical section are coaxially arranged and connected; a first air injection pipe disposed in the middle of the upper cylindrical section; the fuel injection pipe and the second air injection pipe are arranged at the top of the lower conical section, are uniformly arranged on the same horizontal circumference at intervals, are deviated from the central axis of the pressure-bearing outer shell in a pairwise parallel manner, are input in opposite directions by a distance r, and form a virtual circle with the radius r on the section of the corresponding input horizontal circle; the organic waste liquid input pipe is arranged at the upper part of the lower conical section, the input direction of the organic waste liquid input pipe inclines upwards and points to the central shaft of the pressure-bearing outer shell, and the included angle between the input direction of the organic waste liquid input pipe and the central shaft of the pressure-bearing outer shell is between the angle alpha when the input direction of the organic waste liquid is tangent to the virtual circle and the angle beta when the input direction of the organic waste liquid points to the center of the virtual circle.
Preferably, the radius r of the virtual circle is 1/3-2/3 of the radius of the horizontal section of the pressure-bearing outer shell at the connecting position of the fuel injection pipe and the second air injection pipe.
Preferably, the number of the fuel injection pipes and the number of the second air injection pipes are the same, and 2, 3 or 4 fuel injection pipes and 4 second air injection pipes are respectively arranged; and 2-4 organic waste liquid input pipes are uniformly arranged along the same horizontal plane of the upper circumference of the lower conical section.
Preferably, the porous inner shell comprises: the non-porous top cover, the porous straight cylinder section and the support ring are coaxially arranged and connected, and the support ring is connected with the bottom surface of the upper cylindrical section of the pressure-bearing outer shell; and 2-4 first air injection pipes are uniformly arranged along the same horizontal plane of the circumference of the middle part of the upper cylindrical section, and air enters an annular gap formed between the pressure-bearing outer shell and the porous inner shell through the first air injection pipes and then permeates into the inner wall surface of the porous straight cylinder section to form a protective film.
Preferably, the cyclone suspension type supercritical water oxidation reactor further comprises: and the built-in cyclone separator is embedded into the porous inner shell and is coaxially arranged with the porous inner shell.
Preferably, the in-line cyclone separator comprises: the separator top cover, the separator air outlet pipe, the separator tangential feeding pipe, the separator cylindrical section, the separator conical section and the separator ash discharging pipe are arranged in a matched mode, the separator top cover, the separator cylindrical section, the separator conical section and the separator ash discharging pipe are sequentially connected from top to bottom, and the separator ash discharging pipe extends to the lower conical section; the separator tangential feed pipe is arranged on the upper side surface of the cylindrical section of the separator; one end of the separator air outlet pipe is arranged in the cylindrical section of the separator, and the other end of the separator air outlet pipe penetrates through the separator top cover, the nonporous top cover of the porous inner shell and the top cover of the pressure-bearing outer shell to extend out.
Preferably, a wire mesh filter is coaxially arranged at the bottom end of the gas outlet pipe of the separator.
Preferably, an air lock is arranged at the bottom of the ash discharge pipe of the separator.
Preferably, the cyclone suspension type supercritical water oxidation reactor further comprises: and the ash residue discharge pipe is arranged at the center of the bottom of the lower conical section of the pressure-bearing outer shell.
Preferably, the cyclone suspension type supercritical water oxidation reactor further comprises: and the cooling water injection pipe is arranged at the middle lower part of the lower conical section of the pressure-bearing outer shell, and an outlet of the cooling water injection pipe in the lower conical section faces downwards.
The beneficial effects of the invention are as follows:
(1) the cyclone suspension type supercritical water oxidation reactor provided by the invention takes air as a protective fluid, the reaction zone is protected by an air film, the corrosion resistance and salt deposition resistance protection of the reactor are realized, meanwhile, the oxygen in the air strengthens a heat transfer medium in the organic waste liquid reaction process, and the high-efficiency degradation of the organic waste liquid is realized.
(2) The rotational flow suspension type supercritical water oxidation reactor provided by the invention is designed to inject fuel and oxygen into the reactor in a tangential manner, a rotary circular flame zone can be formed, organic waste liquid is injected into the flame zone, the flame wraps the normal-temperature organic waste liquid, internal preheating is realized, sufficient preheating of the organic waste liquid is ensured, the preheating efficiency is high, and the problems of coking, low heat exchange efficiency, blockage and the like caused by direct preheating of the organic waste liquid can be effectively avoided.
(3) According to the cyclone suspension type supercritical water oxidation reactor, fuel and air form rotary air flow, under the action of the rotary air flow, low-density reactants and particles (solid or precipitated inorganic salt) are suspended on corresponding virtual cylinders and spiral upwards, large-size particles fall into a flame area to be further crushed and reacted, larger-size particles formed in the ascending process are secondarily crushed by air injected from the upper part in the process of approaching the inner wall of a porous body and are further mixed and reacted with oxygen in the air, and through enhanced heat and mass transfer, larger excess oxygen and longer retention time, the full oxidative degradation of organic waste liquid containing particles/salt can be realized, and the oxidative degradation effect of the organic waste liquid is greatly improved.
(4) The cyclone suspension type supercritical water oxidation reactor is embedded with the built-in cyclone separator, so that the difference between the internal pressure and the external pressure of the cyclone separator is very small, the structure of a normal-pressure environment is adopted to realize high-efficiency gas-solid separation of reaction products, a high-quality supercritical fluid is formed, and the integral energy recovery efficiency is improved.
(5) The cyclone suspension type supercritical water oxidation reactor provided by the invention can carry out three-stage separation on the reacted solid, and firstly, the gravity separation in the suspension process is used for removing large particles; secondly, a built-in cyclone separator efficiently removes medium and low-grade particles; and finally, fine particles are removed through a wire mesh filter at the outlet of the cyclone separator, so that the particles of the high-temperature fluid after reaction are removed, and the grade and quality of subsequent energy recovery are greatly improved.
(6) The bottom of the cyclone suspension type supercritical water oxidation reactor provided by the invention is rapidly cooled by cooling water to form a subcritical dissolving tank, and a slag discharge outlet at the bottom of the built-in cyclone separator is directly introduced into the dissolving tank, so that the dissolution of soluble salt and the cooling of ash slag are realized, the scaling and blockage of the reactor are effectively avoided, the subsequent solid-liquid separation of the ash slag and inorganic salt is facilitated, and the heat exchange efficiency and the stability of subsequent equipment are improved.
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 diagram showing the structure of a cyclone suspension type supercritical water oxidation reactor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating fuel and air injection in a cyclone suspension type supercritical water oxidation reactor according to an embodiment of the present invention;
FIG. 3 shows a schematic diagram of organic waste liquid injection in a cyclone suspension type supercritical water oxidation reactor according to an embodiment of the present invention,
wherein, the corresponding relationship between the reference numbers and the components in fig. 1 to 3 is:
102 pressure-bearing outer shell, 1022 top cover, 1024 upper cylindrical section, 1026 lower conical section, 104 porous inner shell, 1042 non-porous top cover, 1044 porous straight cylinder section, 1046 support ring, 106 first air injection pipe, 108 fuel injection pipe, 110 second air injection pipe, 112 organic waste liquid input pipe, 114 built-in cyclone separator, 1142 separator top cover, 1144 separator outlet pipe, 1146 separator tangential feed pipe, 1148 separator cylindrical section, 1150 separator conical section, 1152 separator ash discharge pipe, 1154 wire mesh filter, 1156 air lock, 116 ash discharge pipe and 118 cooling water injection pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be further clearly and completely described below with reference to the embodiments of the present invention. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 to 3, a cyclone suspension type supercritical water oxidation reactor according to an embodiment of the present invention includes a pressure-bearing outer shell 102 and a porous inner shell 104 which are coaxially and cooperatively arranged, and has a double-shell structure. The pressure-bearing outer shell 102 includes: a coaxially disposed and connected top cap 1022, an upper cylindrical section 1024, and a lower tapered section 1026. The first air injection pipe 106 is arranged in the middle of the upper cylindrical section 1024, air is injected from the side, a protective film is formed on the inner wall surface of the porous inner shell 104, and the porous inner shell 104 is protected by means of scouring, dissolving, diluting and the like. The fuel injection pipe 108 and the second air injection pipe 110 are arranged at the top of the lower conical section 1026, and are offset in parallel two by two from the central axis of the pressure-bearing outer shell 102 by a distance r, and form a virtual circle with a radius r on the corresponding input horizontal circular section, as shown in fig. 2, so that the preheated fuel and oxygen in the air can rapidly perform supercritical water oxidation reaction, thereby forming a hot liquid flame, and a rotary hot liquid flame zone with the range above the virtual circle can be formed due to the input positions and angles of the fuel and the air. An organic waste liquid input pipe 112 is arranged at the upper part of the lower conical section 1026, the input direction of the organic waste liquid input pipe 112 is inclined upwards and points to the central axis of the pressure-bearing outer shell 102, the included angle between the input direction of the organic waste liquid input pipe 112 and the central axis of the pressure-bearing outer shell 102 is between the angle alpha when the input direction of the organic waste liquid is tangent to the virtual circle and the angle beta when the input direction of the organic waste liquid points to the center of the virtual circle, as shown in fig. 3, so that the organic waste liquid is ensured to be injected right above the virtual circle, reactants such as particles in the normal-temperature organic waste liquid fall into the virtual cylinder formed above the virtual circle and the central axis of the reactor, and hydrothermal flame formed by fuel and air wraps the organic waste liquid, thereby being beneficial to quickly realizing the preheating of the waste liquid, and having high preheating efficiency, effectively avoiding coking caused by the direct preheating of the organic waste liquid, having low heat exchange efficiency, Clogging and the like. Meanwhile, under the action of the rotating airflow formed by the fuel and the air, the reactant with low density is suspended on the corresponding virtual cylinder and spirals upwards, in the process, large-size particles in the waste liquid can fall into a flame area for further crushing and reaction, and particles which cannot react and be crushed fall into an ash cooling area at the bottom. Then the bigger size granule that rises the process and form returns under the effect of centrifugal force and is close to the porous inner wall of porous interior casing 104, is the secondary crushing by the air of radial input, and with the oxygen of upper portion injection air further mix, the reaction, through reinforceing heat and mass transfer, great excess oxygen volume and longer dwell time, realize containing granule/contain abundant oxidative degradation of salt organic waste liquid, improved the oxidative degradation effect of organic waste liquid greatly.
Further, as shown in FIG. 2, the radius r of the imaginary circle is 1/3-2/3 of the radius of the horizontal cross-section of the corresponding pressure containing outer casing 102 at the location where the fuel injection pipe 108 and the second air injection pipe 110 are connected.
Further, as shown in fig. 2, the number of the fuel injection pipes 108 is the same as that of the second air injection pipes 110, and 2 fuel injection pipes are provided; as shown in fig. 1, 2-4 organic waste liquid input pipes 112 are uniformly arranged along the same horizontal plane along the upper circumference of the lower tapered section 1026.
Therefore, a rotary hydrothermal flame area taking the upper part of the virtual circle as a range is further ensured to be formed, the organic waste liquid is further ensured to be injected right above the virtual circle, reactants such as particles in the normal-temperature organic waste liquid fall into the virtual cylinder formed above the virtual circle and the central axis of the reactor, hydrothermal flame formed by fuel and air wraps the organic waste liquid, and the preheating effect of the organic waste liquid is further ensured.
In addition, 3 or 4 fuel injection pipes 108 and 4 second air injection pipes 110 may be provided.
Further, as shown in fig. 1, the porous inner shell 104 includes: a non-porous top cap 1042, a porous straight section 1044 and a support ring 1046 coaxially disposed and connected. The support ring 1046 is attached to the bottom surface of the upper cylindrical section 1024 of the pressure containing outer housing 102. 2-4 first air injection pipes 106 are uniformly arranged along the same horizontal plane of the middle circumference of the upper cylindrical section 1024, air firstly enters an annular gap formed between the pressure-bearing outer shell 102 and the porous inner shell 104 through the first air injection pipes 106, then permeates into the inner wall surface of the porous straight cylindrical section 1044 to form a protective film, and the porous inner shell 104 is protected in a washing, dissolving, diluting and other modes. Air is used as a protective fluid, the reaction zone is protected by an air film, the corrosion resistance and salt deposition resistance of the reactor are realized, meanwhile, the oxygen in the air strengthens a heat transfer medium in the reaction process of the organic waste liquid, and the high-efficiency degradation of the organic waste liquid is realized.
Further, as shown in fig. 1, the cyclone suspension type supercritical water oxidation reactor further includes: an in-line cyclone 114 embedded inside the porous inner shell 104, the in-line cyclone 114 being arranged coaxially with the porous inner shell 104. The difference between the internal pressure and the external pressure of the cyclone separator is very small, and the structure of normal pressure environment is adopted to realize the high-efficiency gas-solid separation of reaction products, so that high-quality supercritical fluid is formed, and the integral energy recovery efficiency is improved.
Further, as shown in fig. 1, the in-line cyclone 114 includes: a separator top cover 1142, a separator gas outlet pipe 1144, a separator tangential feed pipe 1146, a separator cylindrical section 1148, a separator conical section 1150 and a separator ash discharge pipe 1152 which are arranged in a matching way, wherein the separator top cover 1142, the separator cylindrical section 1148, the separator conical section 1150 and the separator ash discharge pipe 1152 are connected in sequence from top to bottom, and the separator ash discharge pipe 1152 extends to a lower conical section 1026; separator tangential feed pipe 1146 is disposed on the upper side of separator cylindrical section 1148; one end of the separator outlet pipe 1144 is disposed within the separator cylindrical section 1148 and the other end extends through the separator top cap 1142, the imperforate top cap 1042 of the porous inner shell 104 and the top cap 1022 of the pressure containing outer shell 102. After the supercritical water oxidation reaction, high-temperature and high-pressure fluid (water, carbon dioxide, nitrogen, oxygen and the like) and particles (ash residues and precipitated inorganic salt) are formed, a large amount of reaction products enter the built-in cyclone separator 114 through the separator tangential feeding pipe 1146, because of the high-temperature and high-pressure characteristics of the reaction products and the small inlet of the built-in cyclone separator 114, the reaction products form high-speed airflow in the cyclone separator, high-efficiency gas-solid separation is completed under the action of gravity, inertia force, centrifugal force and the like, and the purified high-temperature and high-pressure fluid is discharged from the separator gas outlet pipe 1144.
Further, as shown in fig. 1, a wire mesh filter 1154 is coaxially disposed at a bottom end of the separator gas outlet pipe 1144, so that fine particles in the gas can be further removed, the purified reaction fluid can directly enter a turbine for work, the energy grade of the reaction product is greatly improved, and subsequent energy recovery is facilitated.
Further, as shown in fig. 1, a gas lock 1156 is provided at the bottom of the separator ash discharge pipe 1152. Ash particles fall into the lower conical section 1026 of the pressure-bearing outer shell 102 along the separator conical section 1150 and the separator ash discharge pipe 1152, and the bottom of the separator ash discharge pipe 1152 is provided with the air lock 1156, so that the ash is discharged downwards in a single direction, the flow field structure of the built-in cyclone separator 114 is prevented from being influenced to a certain extent, and the gas-solid separation effect is further ensured.
Further, as shown in fig. 1, an ash discharge pipe 116 is provided at the bottom center position of the lower tapered section 1026 of the pressure-bearing outer housing 102 for facilitating the discharge and collection of ash.
Further, as shown in fig. 1, the cooling water injection pipe 118 is disposed at the middle lower portion of the lower conical section 1026 of the pressure-bearing outer shell 102, and the outlet of the cooling water injection pipe 118 inside the lower conical section 1026 faces downward. The injection of cooling water creates a subcritical temperature ash cooling zone in the lower conical section 1026 and the cooling water injection tube 118 is internal to the lower conical section 1026, reducing the impact on the upper reaction zone. The large particles in the reaction process of the organic waste liquid and the fine particles separated by the built-in cyclone separator 114 fall into an ash cooling area, the inorganic salt can be dissolved, and the ash can be cooled and discharged out of the reactor, so that the blockage is avoided and the subsequent separation is facilitated.
The working process of the cyclone suspension type supercritical water oxidation reactor provided by the invention is as follows:
a cyclone suspension type supercritical water oxidation reactor comprises a material preheating injection area, a suspension reaction area, a gas-solid cyclone separation area, a gas film protection area and an ash cooling area. The fuel gas is injected through the fuel injection pipe 108, and the air is injected through the first air injection pipe 106 and the second air injection pipe 110, respectively. The preheated fuel and oxygen in the air can rapidly undergo supercritical water oxidation reaction to form a hydrothermal flame, and due to the input positions and angles of the fuel and air, a rotating hydrothermal flame zone ranging above the virtual circle can be formed. Organic waste liquid is input through the organic waste liquid input pipe 112, the organic waste liquid is injected right above the virtual circle, reactants such as particles in the normal-temperature organic waste liquid fall into the virtual cylinder formed above the virtual circle and the central axis of the reactor, and hydrothermal flames formed by fuel and air wrap the organic waste liquid to preheat the organic waste liquid.
Under the action of rotating airflow formed by fuel and air, the reactant with low density is suspended on the corresponding virtual cylinder and spirals upwards to perform suspension reaction, large-size particles in the organic waste liquid can fall into a flame area for further crushing and reaction, and particles which cannot react and be crushed fall into an ash cooling area at the bottom.
The larger particles formed in the ascending process are returned to the inner wall of the porous straight section 1044 under the action of centrifugal force, and the larger particles are crushed again by the radially input air in the air film protection zone, and the oxygen in the air is further mixed and reacted with the larger particles.
After the supercritical water oxidation reaction, high-temperature and high-pressure fluid (water, carbon dioxide, nitrogen, oxygen and the like) and particles (ash residues and precipitated inorganic salt) are formed, a large amount of reaction products enter the built-in cyclone separator 114 through the separator tangential feeding pipe 1146, because of the high-temperature and high-pressure characteristics of the reaction products and the small inlet of the built-in cyclone separator 114, the reaction products form high-speed airflow in the cyclone separator, high-efficiency gas-solid separation is completed under the action of gravity, inertia force, centrifugal force and the like, and the purified high-temperature and high-pressure fluid is discharged from the separator gas outlet pipe 1144.
The large particles from the reaction of the organic waste liquid and the fine particles from the internal cyclone 114 fall into the ash cooling zone and are discharged from the ash discharge pipe 116.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A cyclone suspension type supercritical water oxidation reactor is characterized by comprising:
the pressure-bearing shell body and the porous interior casing that coaxial cooperation set up, the pressure-bearing shell body includes: the top cover, the upper cylindrical section and the lower conical section are coaxially arranged and connected;
a first air injection pipe disposed in the middle of the upper cylindrical section;
the fuel injection pipes and the second air injection pipes are arranged at the top of the lower conical section, are uniformly arranged on the same horizontal circumference at intervals, are deviated from the central axis of the pressure-bearing outer shell in pairs in parallel, are input in opposite directions by a distance r, and form a virtual circle with the radius r on the section of the corresponding input horizontal circle;
the organic waste liquid input pipe is arranged on the upper portion of the lower conical section, the input direction of the organic waste liquid input pipe inclines upwards and points to the central shaft of the pressure-bearing outer shell, and the included angle between the input direction of the organic waste liquid input pipe and the central shaft of the pressure-bearing outer shell is between the angle alpha when the input direction of the organic waste liquid is tangent to the virtual circle and the angle beta when the input direction of the organic waste liquid points to the center of the virtual circle.
2. The cyclone suspension type supercritical water oxidation reactor according to claim 1, characterized in that,
the radius r of the virtual circle is 1/3-2/3 of the corresponding horizontal section radius of the pressure-bearing outer shell at the connecting position of the fuel injection pipe and the second air injection pipe.
3. The cyclone suspension type supercritical water oxidation reactor according to claim 1,
the fuel injection pipes and the second air injection pipes are arranged in the same number, and 2, 3 or 4 fuel injection pipes are respectively arranged;
and 2-4 organic waste liquid input pipes are uniformly arranged along the same horizontal plane of the upper circumference of the lower conical section.
4. The cyclone suspension type supercritical water oxidation reactor according to claim 1,
the porous inner shell comprises: the non-porous top cover, the porous straight cylinder section and the support ring are coaxially arranged and connected, and the support ring is connected with the bottom surface of the upper cylindrical section of the pressure-bearing outer shell;
and 2-4 first air injection pipes are uniformly arranged along the same horizontal plane of the circumference of the middle part of the upper cylindrical section, and air enters an annular gap formed between the pressure-bearing outer shell and the porous inner shell through the first air injection pipes and then permeates into the inner wall surface of the porous straight cylinder section to form a protective film.
5. The cyclone suspension type supercritical water oxidation reactor according to any one of claims 1 to 4, characterized by further comprising:
and the built-in cyclone separator is embedded in the porous inner shell and is coaxially arranged with the porous inner shell.
6. The cyclone suspension type supercritical water oxidation reactor according to claim 5,
the built-in cyclone separator includes: a top cover of the separator, an air outlet pipe of the separator, a tangential feed pipe of the separator, a cylindrical section of the separator, a conical section of the separator and an ash discharge pipe of the separator which are arranged in a matching way,
the separator top cover, the separator cylindrical section, the separator conical section and the separator ash discharge pipe are sequentially connected from top to bottom, and the separator ash discharge pipe extends to the lower conical section;
the separator tangential feed pipe is arranged on the upper side surface of the cylindrical section of the separator;
one end of the separator air outlet pipe is arranged in the cylindrical section of the separator, and the other end of the separator air outlet pipe penetrates through the separator top cover, the nonporous top cover of the porous inner shell and the top cover of the pressure-bearing outer shell to extend out.
7. The cyclone suspension type supercritical water oxidation reactor according to claim 6,
and the bottom end of the separator air outlet pipe is coaxially provided with a wire mesh filter.
8. The cyclone suspension type supercritical water oxidation reactor according to claim 7,
and an air lock is arranged at the bottom of the separator ash residue discharge pipe.
9. The cyclone suspension type supercritical water oxidation reactor according to claim 8, further comprising:
and the ash residue discharge pipe is arranged at the center of the bottom of the lower conical section of the pressure-bearing outer shell.
10. The cyclone suspension type supercritical water oxidation reactor according to claim 9, further comprising:
and the cooling water injection pipe is arranged at the middle lower part of the lower conical section of the pressure-bearing outer shell, and an outlet of the cooling water injection pipe in the lower conical section faces downwards.
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