CN111762867B - Supercritical water oxidation evaporation wall type reactor - Google Patents
Supercritical water oxidation evaporation wall type reactor Download PDFInfo
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- CN111762867B CN111762867B CN202010675971.1A CN202010675971A CN111762867B CN 111762867 B CN111762867 B CN 111762867B CN 202010675971 A CN202010675971 A CN 202010675971A CN 111762867 B CN111762867 B CN 111762867B
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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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
Abstract
The invention discloses a supercritical water oxidation evaporation wall type reactor, and relates to the field of supercritical water oxidation reactors. The evaporation wall type reactor comprises a cylinder body and a cylinder cover, wherein a material inlet, an oxidant inlet and a reaction cavity are arranged on the cylinder cover, the reaction cavity is positioned below the material inlet and the oxidant inlet, a porous evaporation wall is arranged in the cylinder body, an upper evaporation wall water inlet, a middle evaporation wall water inlet and a lower evaporation wall water inlet are arranged on the side surface of the cylinder body, an upper throttling ring, a middle throttling ring and a lower throttling ring are respectively arranged below the upper evaporation wall water inlet, below the middle evaporation wall water inlet and below the lower evaporation wall water inlet, and the upper throttling ring, the middle throttling ring and the lower throttling ring are positioned in an annular gap formed by the inner wall of the cylinder body and the porous evaporation wall. The evaporation wall type reactor can improve the processing capacity of organic matters, better plays the functions of the evaporation wall type reactor in the aspects of corrosion resistance and salt deposition, and has guiding significance for promoting the structure development and the process optimization of the evaporation wall type reactor.
Description
Technical Field
The invention relates to the field of supercritical water oxidation reactors, in particular to a supercritical water oxidation evaporation wall type reactor.
Background
The supercritical water oxidation technology is an efficient method for treating pollutants and refractory organic compounds, can realize the complete oxidation of organic matters and has no secondary pollution. However, since inorganic salts have extremely low solubility in supercritical water, inorganic salts are liable to be deposited in large amounts, polymerized, and deposited to cause adverse effects. The precipitated inorganic salt is easily adsorbed on the heating surface and the inner wall of the reactor to form a salt layer, so that heat transfer is deteriorated, a corrosion microenvironment dead zone is formed between the salt layer and the hot wall surface, salt deposition has a synergistic promotion effect on corrosion, and pressure fluctuation caused by agglomeration of the precipitated inorganic salt also causes blockage of the reactor and a pipeline, so that system shutdown is caused, and further, the operation reliability and the economical efficiency of the system are reduced.
The evaporation wall type reactor is taken as a device which can effectively overcome the problems of blockage and corrosion in the supercritical water oxidation reaction, and has attracted the attention of scholars at home and abroad in recent years. The evaporation wall water flows through the small holes of the porous evaporation wall, and a protective water film is formed on the inner wall of the evaporation wall, so that the evaporation wall can resist corrosive substances, deposited salt and high temperature. However, the existing supercritical water oxidation evaporation wall type reactor is usually developed based on organic feeding treatment capacity and required residence time and referring to the existing evaporation wall type reactors at home and abroad, and cannot adapt to organic wastewater containing high-concentration organic matters and high salt content, the influence of the structural details of the evaporation wall type reactor on the formation and reaction performance of an organic matter material water film is not considered, and the developed evaporation wall type reactor is not subjected to structural verification and optimization so as to adapt to actual reaction requirements. After developing the evaporation wall type reactor, most researchers only use the evaporation wall type reactor as a tool for experimental research and a verification means for numerical simulation research, do not consider the actual operation condition of the reactor, and do not perform secondary optimization development design on the structure of the reactor. When the existing evaporation wall type reactor operates, the organic materials and the oxidant undergo violent oxidation reaction, a large amount of heat is released, and strong turbulence is formed in a reaction area; the evaporation wall water on the inner surface of the porous evaporation wall and the high-temperature turbulent flow component generate convection heat and mass transfer, so that the temperature of the water film formed in the upper supercritical reaction area is higher (generally higher than the critical temperature), and the continuity of the water film is poor. In addition, the porous evaporation wall has certain internal resistance, when water on the evaporation wall enters an annular gap between the porous evaporation wall and the cylinder, a part of water on the evaporation wall can move along the radial direction of the evaporation wall type reactor, and the other part of water on the evaporation wall is diffused downwards under the action of gravity, so that the water flow of the evaporation wall entering the evaporation wall type reactor is reduced, and the continuity of water film distribution is further reduced.
Therefore, in order to solve the design defects of the supercritical water oxidation evaporation wall type reactor, the evaporation wall type reactor is suitable for supercritical water oxidation treatment of organic matters with high concentration and high salt content, the structure of the evaporation wall type reactor needs to be improved to form an excellent water film, the continuity of the water film and the corrosion resistance and salt deposition resistance of the reactor are improved, and the stable and safe operation of the whole reaction system is ensured.
Disclosure of Invention
The invention aims to provide a supercritical water oxidation evaporation wall type reactor, which aims to overcome the design defects of the existing evaporation wall type reactor and enable the evaporation wall type reactor to form an excellent water film in the water oxidation process.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a supercritical water oxidation evaporation wall type reactor comprises a cylinder body and a cylinder cover, wherein a reaction cavity is arranged on the cylinder cover, and when the cylinder body and the cylinder cover are covered, the reaction cavity and an inner cavity of the cylinder body form a closed reaction area; the barrel is internally provided with a porous evaporation wall, the porous evaporation wall and the inner wall of the barrel form an annular gap, the side surface of the barrel is sequentially provided with an upper evaporation wall water inlet, a middle evaporation wall water inlet and a lower evaporation wall water inlet from top to bottom, an upper throttling ring, a middle throttling ring and a lower throttling ring are respectively arranged below the upper evaporation wall water inlet, the middle evaporation wall water inlet and the lower evaporation wall water inlet, and the upper throttling ring, the middle throttling ring and the lower throttling ring are positioned in the annular gap formed by the inner wall of the barrel and the porous evaporation wall.
Furthermore, a material inlet and an oxidant inlet are arranged on the cylinder cover, and the reaction cavity is positioned below the material inlet and the oxidant inlet.
Furthermore, the vertical distance from the upper throttling ring to the water inlet of the upper evaporation wall is 2mm, the vertical distance from the middle throttling ring to the water inlet of the middle evaporation wall is 10mm, and the vertical distance from the lower throttling ring to the water inlet of the lower evaporation wall is 20 mm.
Further, the porosity of the porous evaporation wall was 0.3.
Furthermore, the side surface of the cylinder body is provided with an upper liquid taking channel and a lower liquid taking channel, and the upper liquid taking channel and the lower liquid taking channel horizontally penetrate through the porous evaporation wall and then extend into the cylinder body.
Further, the upper liquid extraction channel is located between the upper throttling ring and the middle evaporation wall water inlet, and the lower liquid extraction channel is located between the lower throttling ring and the lower evaporation wall water inlet.
Further, the distance from the upper liquid taking channel to the upper port of the cylinder body is 1/3 of the length of the cylinder body, and the distance from the lower liquid taking channel to the bottom of the cylinder body is 1/3 of the length of the cylinder body.
Further, the bottom of the cylinder body is also provided with a liquid outlet.
Further, an electric heater is arranged in the porous evaporation wall.
Furthermore, the material flow rate of the evaporation wall type reactor is 0.9-1.2 L.h-1The material concentration is 15-30%, the material preheating temperature is 703-783K, the evaporation intensity is 0.25-0.45, and the water temperature at the upper evaporation wall water inlet, the middle evaporation wall water inlet and the lower evaporation wall water inlet is 533-583K.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a supercritical water oxidation evaporation wall type reactor. When the evaporation wall type reactor is used for treating organic wastewater, the organic material reacts with the oxidant to form a high-temperature reaction zone, and high-temperature turbulence components formed in the high-temperature reaction zone can be subjected to turbulence diffusion in the reaction cavity, so that the intensity of convective heat and mass transfer with water of the porous evaporation wall is reduced, the temperature of a water film in the zone can be reduced, and the continuity of the water film is improved. Secondly, through setting up this three layer construction of upper portion evaporation wall water inlet, middle part evaporation wall water inlet and lower part evaporation wall water inlet in this application, improve the continuity of evaporation wall water distribution, expand the salt dissolving area scope, increase subcritical water film length to improve system corrosion resistance and salt deposition performance. And thirdly, an upper throttling ring, a middle throttling ring and a lower throttling ring are arranged at the lower parts of the upper evaporation wall water inlet, the middle evaporation wall water inlet and the lower evaporation wall water inlet, so that the water film distribution continuity of the evaporation wall water is improved, and the evaporation wall reactor is supported and protected. Therefore, the reaction cavity, the evaporation wall water inlet with the three-layer structure and the throttle ring are arranged, so that the continuity of a water film at the porous evaporation wall and the corrosion resistance and the salt deposition resistance of the evaporation wall type reactor are improved, and the evaporation wall type reactor can adapt to supercritical water oxidation treatment of organic matters with high concentration and high salt content.
Further, be equipped with material entry and oxidant entry in this application on the cover, the reaction chamber is located the below of material entry and oxidant entry, and inorganic salt and the corrosive substance that diffuse to the reaction intracavity can get into fast in the evaporation wall reactor under the action of gravity and organic material and oxidant inlet pressure to the reduction takes place the probability of salt deposit and corruption.
Further, the porosity of the porous evaporation wall of the evaporation wall reactor is set to 0.3, and the water film formed in the evaporation wall reactor has higher continuity and lower temperature under the porosity, so that the development cost of the evaporation wall reactor is not increased too much, and the running stability of the evaporation wall reactor is not reduced.
Further, get liquid passageway setting in the side of barrel from top to bottom in this application, this kind of mode of setting can not reduce the continuity of water film. And (4) carrying out liquid taking analysis on the supercritical water membrane area at the upper part and the subcritical water membrane area at the lower part through the upper and lower liquid taking channels.
Drawings
FIG. 1 is a structural diagram of a novel supercritical water oxidation evaporation wall type reactor of the present invention;
wherein: 1-cylinder, 2-porous evaporation wall, 3-material inlet, 4-oxidant inlet, 5-upper evaporation wall water inlet, 6-middle evaporation wall water inlet, 7-lower evaporation wall water inlet, 8-reaction chamber, 9-upper throttling ring, 10-middle throttling ring, 11-lower throttling ring, 12-upper liquid taking channel, 13-lower liquid taking channel, 14-liquid outlet and 15-electric heater.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, a supercritical water oxidation evaporation wall type reactor, including barrel 1 and cover, barrel 1 and cover adopt high temperature resistant nut, bolt fastening, the cover has been seted up material entry 3 and oxidant entry 4, be equipped with porous evaporation wall 2 in the barrel 1, porous evaporation wall 2 leaves the annular space with barrel 1 inner wall, the position is equipped with upper portion evaporation wall water inlet 5, middle part evaporation wall water inlet 6, lower part evaporation wall water inlet 7 about on the barrel 1 side, barrel 1 bottom still is equipped with liquid outlet 14, be equipped with electric heater 15 in the porous evaporation wall 2.
In this application, a reaction chamber 8 is provided on the cover of the evaporation wall reactor, and the reaction chamber 8 is located below the material inlet 3 and the oxidant inlet 4. When the cylinder body 1 and the cylinder cover are closed, the reaction chamber 8 and the inner cavity of the cylinder body 1 form a closed reaction area; the reaction cavity 8 expands the range of the upper supercritical reaction area, the high-temperature turbulent flow component can carry out turbulent flow diffusion in the reaction cavity 8, and the intensity of convective heat and mass transfer of the high-temperature turbulent flow component and the water of the porous evaporation wall is reduced, so that the temperature of the water film of the upper supercritical reaction area can be reduced, and the continuity of the water film is improved. And the inorganic salt and corrosive substances diffused into the reaction cavity 8 can rapidly enter the cylinder 1 of the evaporation wall type reactor under the action of gravity and the action of the inlet velocity gradient of the organic material and the oxidant, so that the probability of salt deposition and corrosion is reduced.
In order to ensure that the evaporation wall water can effectively diffuse into the barrel 1 of the evaporation wall type reactor and form a continuous water film on the surface of the porous evaporation wall 2, an upper throttling ring 9, a middle throttling ring 10 and a lower throttling ring 11 are respectively arranged at specific positions of the lower parts of the upper evaporation wall water inlet 5, the middle evaporation wall water inlet 6 and the lower evaporation wall water inlet 7, and the upper throttling ring 9, the middle throttling ring 10 and the lower throttling ring 11 are positioned in an annular gap between the inner wall of the barrel 1 and the porous evaporation wall 2. The vertical distance from the upper throttling ring 9 to the upper evaporation wall water inlet 5 is 2mm, the vertical distance from the middle throttling ring 10 to the middle evaporation wall water inlet 6 is 10mm, and the vertical distance from the lower throttling ring 11 to the lower evaporation wall water inlet 7 is 20 mm. The design of the upper throttling ring 9, the middle throttling ring 10 and the lower throttling ring 11 can not only improve the water film distribution continuity, but also play a role in supporting and protecting the evaporation wall type reactor, prolong the service life of the porous evaporation wall 2 and improve the running stability of the evaporation wall type reactor.
Inner diameter influencing evaporation wall type of porous evaporation wall 2The size of chemical reaction, heat transfer and mass transfer areas in the reactor and the water flow of the evaporation wall in unit area influence the formation of the water film, the increase of the inner diameter of the evaporation wall is beneficial to the formation of subcritical continuous water films, and the coverage rate of the water films is improved. The length of the evaporation wall reactor can influence the relative distribution condition of a high-temperature reaction zone and a subcritical salt dissolving zone in the reactor and the convection heat exchange condition between evaporation wall water and a main fluid in the reaction zone, the length of the reactor is increased, the length of the salt dissolving zone can be increased, the heat exchange condition of the reaction zone is improved, and the processing capacity of the reactor is improved. When the organic feed flow rate is large or the organic feed concentration is large, the subcritical water film length and the subcritical salt dissolving zone range in the conventional evaporation wall type reactor (L ═ 146mm) are small, and the evaporation wall type reactor may have corrosion and salt deposition problems, which is not favorable for the safe operation of the evaporation wall type reactor. In order to improve the corrosion resistance and salt deposition of the evaporation wall type reactor, improve the processing capacity of the evaporation wall type reactor and provide a suitable safe processing allowance for the evaporation wall type reactor, the length of the barrel of the evaporation wall type reactor is designed to be L-160 mm, and the inner diameter of the barrel is designed to be dp60mm, the inner diameter of the porous evaporation wall 2 is designed to be dt46mm, the thickness of the porous evaporation wall 2 is 2 mm.
The porous evaporation wall 2 is a key structure for forming a continuous subcritical water membrane, the higher porosity of the porous evaporation wall 2 is beneficial to forming the high-continuity subcritical water membrane, the range of a salt dissolving zone of the evaporation wall type reactor can be expanded, but when the porosity is increased, the structural strength of the porous evaporation wall can be greatly reduced, the operation safety of a system is reduced, and the development cost can be sharply increased. The porosity is set to 0.3 in the present application, and the water film formed in the reactor has high continuity and low temperature, and the development cost of the reactor is not increased too much and the operation stability of the system is not reduced.
Be equipped with in this application and get liquid passageway 12 and get liquid passageway 13 down on barrel 1 side, go up and get liquid passageway 12 and get liquid passageway 13 down and stretch into barrel 1 inside after the equal level of porous evaporation wall 2. An upper liquid extraction channel 12 is located between the upper restrictor ring 9 and the middle evaporation wall water inlet 6, and a lower liquid extraction channel 13 is located between the lower restrictor ring 11 and the lower evaporation wall water inlet 7. The arrangement mode avoids the influence of the liquid taking pipe on the water film and improves the continuity of the water film formation. Preferably, the distance from the upper liquid taking channel 12 to the upper port of the cylinder 1 is 1/3 the length of the cylinder 1, the distance from the lower liquid taking channel 13 to the bottom of the cylinder 1 is 1/3 the length of the cylinder 1, and the upper liquid taking channel 12 and the lower liquid taking channel 13 respectively perform liquid taking analysis on the upper supercritical water membrane region and the lower subcritical water membrane region.
In addition, the upper reaction temperature of the evaporation wall type reactor can reflect the condition of organic materials, and the lower subcritical region temperature can reflect the formation condition of a subcritical salt dissolving region. In the application, two temperature measuring points are designed in the barrel 1 of the evaporation wall type reactor, namely, three thermocouples are designed at each temperature measuring point which is positioned at the position of 30mm and L (L) being 110mm in the length direction of the barrel (from top to bottom) so as to detect the temperature of an upper supercritical reaction zone and a lower subcritical reaction zone, and the radial distances between the positions of the three thermocouples and the central axis of the barrel are respectively r (8 mm), 13mm and 18 mm.
In this embodiment, the material inlet 3, the oxidant inlet 4, the upper evaporation wall water inlet 5, the middle evaporation wall water inlet 6, the lower evaporation wall water inlet 7, and the liquid outlet 14 all adopt pipes with an inner diameter of 4 mm.
In the supercritical water oxidation process, different operation parameters, different chemical reactions and different flow heat and mass transfer conditions in the evaporation wall type reactor, different water film formation in the evaporation wall type reactor and different flow field distribution conditions of the evaporation wall type reactor result in different corrosion resistance and salt deposition functions of the evaporation wall type reactor. In order to better exert the corrosion resistance and salt deposition of the evaporation wall type reactor, the corrosion resistance and salt deposition of the evaporation wall type reactor are improved on the premise of ensuring the stable operation of a system, the range of the operation parameters is expanded to a certain extent, the recommended range of the operation parameters is given, and the operation parameters suitable for the evaporation wall type reactor are formed.
Organic feed flow rate, organic feed concentration (. alpha.)m) Organic material preheating temperature (T)feed) Evaporation intensity (X), evaporation wall water temperature (T)t) Equal operating parameters can affect the flow field distribution and the water film in an evaporation wall reactorThus affecting the range of the salt dissolving area of the evaporation wall type reactor, the water film temperature, the water film continuity and the subcritical water film length, and finally affecting the corrosion resistance and the salt deposition performance of the reactor. Defining the ratio of the water flow through the evaporator wall to the sum of the feed and oxidant flows as the evaporation intensity X, as represented by the formula:
in the formula: foxFlow of oxidizing agent/Lss-1；FfeOrganic feed flow/Ls-1；FtwWater flow/Ls of evaporation wall-1。
The reduction of the organic feeding flow can reduce the amount of organic materials entering the evaporation wall type reactor for reaction, and the heat emitted by supercritical water oxidation reaction is reduced, so that the concentration level of the reactor is reduced, the length of a subcritical water film is extended, and the coverage rate of the water film and the range of a salt dissolving area are improved. In order to ensure that the evaporation wall type reactor has higher corrosion resistance, salt deposition resistance and higher treatment efficiency, the flow rate of the organic material is 0.9-1.2 L.h-1The flow range of (3) is taken as the operating range of the organic feed flow of the evaporation wall reactor. The increase of the concentration of the organic material can greatly reduce the continuity of the water film and increase the temperature of the water film, is not favorable for the evaporation wall type reactor to exert the effects of corrosion resistance and salt deposition, and avoids adopting overhigh concentration of the organic materialm15-30% as the operating range for the concentration of organic feed in the evaporation wall reactor. Different material preheating temperatures can change the heat entering the reactor, thereby influencing the flow field distribution and the water film formation in the evaporation wall type reactor, the lower material temperature can ensure that the evaporation wall type reactor can play stronger functions of corrosion resistance and salt deposition, and the preheating temperature T of the organic material feedingfeedThe operation range of the organic material preheating temperature of the evaporation wall type reactor is 703-783K. The evaporation intensity directly influences the continuity and the temperature of water film distribution and influences the cooling effect of the evaporation wall type reactor, and the evaporation intensity X is 0.25-0.45 and is used as the operation range of the evaporation intensity of the evaporation wall type reactor. Lower isThe water temperature of the evaporation wall is favorable for increasing the length of a subcritical salt dissolving zone, expanding the length of a subcritical water film, improving the continuity of the water film and reducing the temperature Tt533-583K is used as the temperature operation range of the evaporation wall water of the evaporation wall reactor.
TABLE 1 operating Process settings for an evaporative wall reactor
The structure development optimization design is carried out on the conventional supercritical water oxidation evaporation wall type reactor, and the size of the evaporation wall type reactor is optimized and adjusted, so that the supercritical water oxidation evaporation wall type reactor is more suitable for supercritical water oxidation reaction; novel structures such as a reaction cavity, a throttling ring and a three-layer evaporation wall water structure are developed to optimize the performance of the evaporation wall type reactor; the temperature measuring point position and the liquid taking pipe position of the evaporation wall type reactor are optimized and adjusted, and the influence degree of the temperature measuring device and the liquid taking pipe in the evaporation wall type reactor on the formation of a water film and the reaction performance in the evaporation wall type reactor is reduced. The evaporation wall type reactor can improve the processing capacity of materials (organic matters), better plays the functions of the evaporation wall type reactor in the aspects of corrosion resistance and salt deposition, and has guiding significance for promoting the structure development and the process optimization of the evaporation wall type reactor. After the evaporation wall type reactor is developed, the range of the operation parameters of the evaporation wall type reactor is expanded based on the influence of the operation parameters on the reaction performance and the water film characteristic of the evaporation wall type reactor and the combination of the structural characteristics of the evaporation wall type reactor, so that the operation process of the evaporation wall type reactor is formed to guide the safe and stable operation of the evaporation wall type reactor, and the evaporation wall type reactor is more suitable for industrial large-scale application.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A supercritical water oxidation evaporation wall type reactor is characterized by comprising a cylinder body (1) and a cylinder cover, wherein the cylinder cover is provided with a reaction cavity (8), and when the cylinder body (1) is covered with the cylinder cover, the reaction cavity (8) and the inner cavity of the cylinder body (1) form a closed reaction area; a porous evaporation wall (2) is arranged in the barrel (1), an annular gap is formed between the porous evaporation wall (2) and the inner wall of the barrel (1), an upper evaporation wall water inlet (5), a middle evaporation wall water inlet (6) and a lower evaporation wall water inlet (7) are sequentially arranged on the side surface of the barrel (1) from top to bottom, an upper throttling ring (9), a middle throttling ring (10) and a lower throttling ring (11) are respectively arranged below the upper evaporation wall water inlet (5), the middle evaporation wall water inlet (6) and the lower evaporation wall water inlet (7), and the upper throttling ring (9), the middle throttling ring (10) and the lower throttling ring (11) are positioned in the annular gap formed between the inner wall of the barrel and the porous evaporation wall (2);
the cylinder cover is provided with a material inlet (3) and an oxidant inlet (4), and the reaction cavity (8) is positioned below the material inlet (3) and the oxidant inlet (4); the porosity of the porous evaporation wall (2) is 0.3.
2. The supercritical water oxidation evaporation wall reactor according to claim 1, wherein the vertical distance of the upper throttling ring (9) from the upper evaporation wall water inlet (5) is 2mm, the vertical distance of the middle throttling ring (10) from the middle evaporation wall water inlet (6) is 10mm, and the vertical distance of the lower throttling ring (11) from the lower evaporation wall water inlet (7) is 20 mm.
3. The supercritical water oxidation evaporation wall type reactor of claim 1, wherein the side of the barrel (1) is provided with an upper liquid taking channel (12) and a lower liquid taking channel (13), and both the upper liquid taking channel (12) and the lower liquid taking channel (13) horizontally penetrate through the porous evaporation wall (2) and then extend into the barrel (1).
4. A supercritical water oxidation evaporation wall reactor according to claim 3 characterized in that the upper liquid extraction channel (12) is located between the upper throttling ring (9) and the middle evaporation wall water inlet (6) and the lower liquid extraction channel (13) is located between the lower throttling ring (11) and the lower evaporation wall water inlet (7).
5. The supercritical water oxidation evaporation wall reactor as set forth in claim 3, wherein the distance from the upper liquid extraction channel (12) to the upper port of the barrel (1) is 1/3 of the length of the barrel (1), and the distance from the lower liquid extraction channel (13) to the bottom of the barrel (1) is 1/3 of the length of the barrel (1).
6. Supercritical water oxidation evaporation wall reactor according to claim 1, characterized by that the bottom of the cylinder (1) is also provided with a liquid outlet (14).
7. Supercritical water oxidation evaporation wall reactor according to claim 1, characterized by that inside the porous evaporation wall (2) is located an electric heater (15).
8. The supercritical water oxidation evaporation wall type reactor of claim 1, wherein the material flow rate of the evaporation wall type reactor is 0.9-1.2 L.h-1The concentration of the material is 15-30%, the preheating temperature of the material is 703-783K, the evaporation intensity is 0.25-0.45, and the water temperatures at the upper evaporation wall water inlet (5), the middle evaporation wall water inlet (6) and the lower evaporation wall water inlet (7) are 533-583K; defining the ratio of the water flow through the evaporator wall to the sum of the feed and oxidant flows as the evaporation intensity X, as represented by the formula:
in the formula:F oxflow of oxidizing agent/L.s-1；F feOrganic feed flow/L.s-1；F twEvaporative wall water flow/L.s-1。
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