Supercritical hydrothermal combustion device and method with residue self-separation function

Abstract

A supercritical hydrothermal combustion device with a residue self-separation function, wherein a hydrothermal flame generator is arranged in the upper center of the device body, a high-temperature combustion stabilizing body is arranged on the side, the outer wall of the high-temperature combustion stabilizing body is a double helix structure, and cooperates with the inner wall of the device body to form a feeding double helix channel, the upper part of the device body is provided with a high-pressure auxiliary agent delivery channel and a feeding inner channel connected to the inlet of the feeding double helix channel, a swirl generating device is arranged on the inner wall of the high-temperature combustion stabilizing body, a burnt ember slurry converging cone is arranged at the lower part of the device body, a supercritical hot fluid guide cone is arranged at the lower part of the burnt ember slurry converging cone, a burnt ember slurry outlet is arranged at the upper part of the side of the converging cone, and a supercritical hot fluid outlet is arranged at the bottom of the guide cone. The present invention also provides a corresponding combustion method, which realizes rapid ignition of solid phase or solid-containing fuel, efficient and clean combustion, and effective separation of slag flow after burnout.

Description

Technical Field

[0001] The invention belongs to the technical field of advanced combustion and energy-saving and environmental protection, and in particular relates to a supercritical hydrothermal combustion device and method with a residue self-separation function. Background Art

[0002] Supercritical water refers to water in a special state where both the temperature and pressure are higher than its critical point (Tc = 374.15°C, Pc = 22.12MPa). Supercritical water oxidation technology uses the special properties of supercritical water such as low viscosity, low dielectric constant, and high diffusivity to make the organic matter completely dissolved in it react with the oxidant quickly and thoroughly in a homogeneous manner. The carbon element in the organic matter is converted into carbon dioxide, and the elements such as chlorine, sulfur, and phosphorus are converted into corresponding inorganic salts. Most of the nitrogen element is converted into nitrogen gas, thereby achieving efficient and harmless treatment of organic waste. Supercritical water oxidation is a green, efficient, and thorough organic waste harmless treatment and disposal technology, and is hailed as the most promising organic waste treatment technology in the 21st century. Supercritical water combustion technology is a new type of international cutting-edge combustion technology, which can be regarded as a violent supercritical water oxidation technology that produces a "hydrothermal flame", also known as a "water-fire compatible" combustion technology. The local high temperature of more than 1000°C in the hydrothermal flame zone can achieve rapid oxidation and degradation of organic matter in fossil fuels and pollutants, while releasing abundant heat.

[0003] At present, the problems of salt deposition and corrosion have restricted the low-cost and reliable industrial implementation of supercritical water oxidation technology to a certain extent. The high-temperature zone of 300-410℃ is the sensitive zone for material corrosion and the zone for rapid precipitation of inorganic salts in the supercritical water oxidation process system. The equipment serving in this working condition zone faces a relatively severe risk of corrosion and blockage caused by salt deposition. If the supercritical hydrothermal flame is mixed with a lower temperature material (<300℃) to achieve the rapid heating of the latter, or the rapid supercritical hydrothermal flame ignition and combustion of the lower material is directly achieved, the high-incidence zone of equipment corrosion and salt deposition blockage in the temperature zone of 300-410℃ can be avoided. In addition, in the field of energy, conventional coal-fired power generation systems and coal-fired industrial boilers are in principle "burning coal in one fire" in a gaseous environment with air as an oxidant, and the industrial pollutants such as fly ash, sulfur oxides, nitrogen oxides and carbon have caused huge environmental pollution. Supercritical hydrothermal combustion of fossil fuels such as coal is a technology with very broad prospects. Supercritical hydrothermal combustion of coal is a new combustion technology that can achieve efficient and clean utilization of coal without the need for end-of-pipe control of pollutants. Compared with conventional coal combustion technology, supercritical hydrothermal combustion technology of coal can achieve the reduction of pollutants NO without the need for terminal devices such as desulfurization, denitrification and dust removal. x 、SO xThe source control of dust can easily achieve low-cost capture of CO2, and has extremely superior environmental performance. However, the hydrothermal combustion of solid fuels such as coal and sludge will still generate solid-phase burnt ember slurry. If it is not handled properly, it will block subsequent devices and affect the normal operation of the whole. Therefore, a hydrothermal combustion device that can achieve rapid ignition of fuel and effective separation of slag flow after combustion is the key to achieving efficient and clean combustion of solid or solid-containing fuels such as coal and sludge. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a supercritical hydrothermal combustion device and method with a residue self-separation function, which realizes the rapid ignition, efficient and clean combustion of solid or solid-containing fuels such as coal and sludge, and effective separation of the slag flow after combustion, thereby realizing the efficient and pollution-free conversion of chemical energy of fossil fuels, urban / industrial sludge, etc. into thermal energy.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A supercritical hydrothermal combustion device with a residue self-separation function comprises a device body 2, characterized in that a hydrothermal flame generator 5 is arranged in the upper center of the device body 2, a high-temperature combustion stabilizing body 10 is arranged on the upper side, the outer wall of the high-temperature combustion stabilizing body 10 is a double helix structure, and cooperates with the inner wall of the device body 2 to form a feed double helix channel 12, a high-pressure auxiliary agent delivery channel 6 connected to the inlet of the feed double helix channel 12 and a feed inner channel 15 connected to the outlet of the feed double helix channel 12 are arranged on the upper part of the device body 2, a swirl generating device 11 is arranged on the inner wall of the high-temperature combustion stabilizing body 10, the swirl generating device 11 is located at the lower part of the high-temperature combustion stabilizing body 10, a burnt slag slurry converging cone 3 is arranged at the lower part of the device body 2, the burnt slag slurry converging cone 3 is connected to the supercritical hot fluid guide cone 4 at the lower part, a plurality of burnt slag slurry outlets D are arranged on the upper side of the burnt slag slurry converging cone 3, and a supercritical hot fluid outlet C is arranged at the bottom of the supercritical hot fluid guide cone 4.

[0007] Preferably, the device body 2 is wrapped by a high-efficiency cooling jacket 1, and the high-efficiency cooling jacket 1 is a jacket structure or a single-layer / multi-layer spiral channel structure, and the coolant is water, air, heat transfer oil, organic slurry or oxidant.

[0008] Preferably, the hydrothermal flame generator 5 is a multi-stage truncated cone structure, and the first-stage table surface at its upper end matches with the inner wall of the device body 2 to form an oxidant annular space 13 connected to the inside of the reactor, and the second-stage table surface matches with the inner wall of the device body 2 to form an auxiliary agent annular space 14 connected to the inside of the reactor. The high-pressure material cylinder 8 passes through the center of the hydrothermal flame generator 5 from top to bottom and is connected to the inside of the device body 2. The high-pressure oxidant cylinder 9 passes through the hydrothermal flame generator 5 or the device body 2 from top to bottom and is connected to the oxidant annular space 13. The auxiliary agent annular space 14 is connected to the feed double helix channel 12 through the feed inner channel 15, so that the materials are evenly mixed in the high-temperature stable combustion body 10 and a stable flame is generated, ensuring that the organic slurry is fully burned.

[0009] Preferably, the high-pressure material cylinder 8 and the high-pressure oxidant cylinder 9 are coaxially arranged and connected at the top by a sealing connection structure 7, and the pressure at the inlet A of the high-pressure material cylinder 8 and the inlet B of the high-pressure oxidant cylinder 9 are not less than 23 MPa.

[0010] Preferably, the oxidant annular space 13 passes through the oxidant annular outward expansion channel 16 penetrating the hydrothermal flame generator 5 to the inside of the device body 2, and the auxiliary agent annular space 14 passes through the auxiliary agent annular outward expansion channel 17 penetrating the hydrothermal flame generator 5 to the inside of the device body 2.

[0011] Preferably, a nozzle structure 18 is provided at the bottom of the high-pressure material cylinder 8, which includes but is not limited to a fan-shaped nozzle, a solid cone nozzle, a hollow cone nozzle, and a square nozzle. Depending on the feed flow rate and type, the high-pressure material cylinder 8 can be used as an auxiliary agent feed channel, and the high-pressure auxiliary agent delivery channel 6 can be a material feed channel.

[0012] Preferably, the high-temperature combustion stabilizing body 10 is a contraction-expansion structure to facilitate the accelerated entry of the burned material into the vortex generating device 11. The high-temperature combustion stabilizing body 10 and the vortex generating device 11 ensure that the burnt slag slurry and the supercritical fluid rotate downward to facilitate the separation of the burnt slag slurry from the supercritical thermal fluid at the burnt slag slurry convergence cone 3.

[0013] Preferably, the burnt slag slurry converging cone 3 is a microporous structure with a truncated cone profile, a large number of micropores distributed circumferentially, a single large hole opened on the top or the top is covered with medium-sized holes, and the burnt slag slurry outlet D is connected to a guide pipe of a flow control valve 19, and the number of the burnt slag slurry outlets D is 1, 2 or 3.

[0014] The present invention also provides a supercritical hydrothermal combustion method based on the supercritical hydrothermal combustion device with the residue self-separation function. When the device is started, supercritical water that has been treated to meet the standards is first injected from the inlet A of the high-pressure material cylinder 8 and sprayed into the device body 2 through the nozzle structure 18. At this time, the high-pressure auxiliary agent delivery channel 6 and the high-pressure oxidant cylinder 9 are in a closed state;

[0015] After the supercritical water fills the entire device body 2, the fluid at the inlet A of the high-pressure material cylinder 8 is switched to organic slurry, and the high-pressure auxiliary agent delivery channel 6 and the high-pressure oxidant cylinder 9 are opened at the same time, and the oxidant and auxiliary agent at the same temperature and pressure are injected, and the thermal self-ignition is ignited in the hydrothermal flame generator 5, and stable combustion is achieved in the high-temperature stable combustion body 10;

[0016] A coolant is introduced into the high-efficiency cooling jacket 1 to control the wall temperature of the device body 2 to be below 500°C;

[0017] When the device is running stably, each material generates flames in the hydrothermal flame generator 5 and is evenly mixed and stably burned in the high-temperature stable combustion body 10. The burned materials are accelerated into the swirl generating device 11, and the ejected flames are intertwined and move downward in a spiral column shape, while driving the surrounding fluid to rotate in the same manner. The burnt ember slurry is continuously deposited in the depression of the burnt ember slurry converging cone 3 by inertia.

[0018] When the operation of removing the burnt ember slurry is performed, the flow rate of the burnt ember slurry is controlled by the flow control valve 19 to prevent the outflow from being too fast and affecting the outflow stability of the product at the supercritical hot fluid outlet C. The coolant is kept to cool the device body 2 continuously during the whole process.

[0019] Preferably, the oxidant includes but is not limited to liquid oxygen, oxygen or air, and the organic slurry includes but is not limited to coal slurry, municipal sludge, oil sludge or petrochemical residue.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The hydrothermal combustion generator is located in the center of the upper part of the hydrothermal combustion device, and the bottom thereof is provided with an annular outward expansion channel for the oxidant and an annular outward expansion channel for the auxiliary agent, so that the various materials can be evenly mixed in the high-temperature combustion stabilizing body and produce a stable flame, ensuring the full combustion of the organic slurry; the high-temperature combustion stabilizing body with a contraction-expansion structure accelerates the burned materials to enter the swirl generating device, which is beneficial to the enhancement of the swirl effect. The rotating supercritical hydrothermal fireball can make the solid phase particles rotate in the device, prolonging its process and facilitating combustion. After combustion in the lower part of the device, the solid phase particles in the solid-containing supercritical fluid gather to the bottom of the burnt slag slurry convergence cone under the action of the rotating centrifugal force; in addition, the microporous burnt slag slurry convergence cone has a filtering effect on the solid phase particles, thereby realizing the efficient self-separation of the slag slurry and the supercritical thermal fluid after combustion.

[0022] 2. After supercritical hydrothermal combustion, sulfur and most nitrogen in the fuel enter the burnt slag slurry in the form of sulfate, nitric acid / nitrite. The separated supercritical liquid phase fluid is mainly composed of supercritical water, carbon dioxide, nitrogen and a small amount of excess oxygen, thus achieving the goal of pollutant NO x 、SO x, and dust source control, which can easily achieve low-cost capture of CO2 and has extremely superior environmental protection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0024] Wherein: 1. High-efficiency cooling jacket; 2. Device body; 3. Burnt slag slurry convergence cone; 4. Supercritical thermal fluid guide cone; 5. Hydrothermal flame generator; 6. High-pressure auxiliary agent delivery and distribution channel; 7. Sealed connection structure; 8. High-pressure material cylinder; 9. High-pressure oxidant cylinder; 10. High-temperature stable combustion body; 11. Swirl generating device; 12. Feed double helix channel; 13. Oxidant annular space; 14. Auxiliary agent annular space; 15. Feed inner channel; 16. Oxidant annular expansion channel; 17. Auxiliary agent annular expansion channel; 18. Nozzle structure; 19. Flow control valve; A. High-pressure material cylinder inlet; B. High-pressure oxidant cylinder inlet; C. Supercritical thermal fluid outlet; D. Burnt slag slurry outlet; E. Cooling water inlet; F. Cooling water outlet. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0026] like Figure 1 As shown, a supercritical hydrothermal combustion device with a residue self-separation function of the present invention is a water-fire compatible swirl supercritical hydrothermal combustion device, which includes a device body 2, and the device body 2 is wrapped by a high-efficiency cooling jacket 1. The high-efficiency cooling jacket 1 is a jacket structure or a single-layer / multi-layer spiral channel structure. The coolant can be water, air, heat transfer oil, organic slurry or oxidant, etc. The cooling water in the cooling jacket 1 enters from the cooling water inlet E at the top and flows out through the cooling water outlet F.

[0027] in:

[0028] A hydrothermal flame generator 5 is arranged in the upper center of the device body 2. In this embodiment, the hydrothermal flame generator 5 is a multi-stage truncated cone structure, and the first stage table at the upper end matches with the inner wall of the device body 2 to form an oxidant annular space 13, and the second stage table matches with the inner wall of the device body 2 to form an auxiliary agent annular space 14. The oxidant annular space 13 passes through the oxidant annular outward expansion channel 16 that penetrates the hydrothermal flame generator 5 to the inside of the device body 2, and the auxiliary agent annular space 14 passes through the auxiliary agent annular outward expansion channel 17 that penetrates the hydrothermal flame generator 5 to the inside of the device body 2. The high-pressure material cylinder 8 passes through the center of the hydrothermal flame generator 5 from top to bottom and is connected to the inside of the device body 2. The high-pressure oxidant cylinder 9 passes through the hydrothermal flame generator 5 or the device body 2 from top to bottom and is connected to the oxidant annular space 13. The high-pressure material cylinder 8 and the high-pressure oxidant cylinder 9 are coaxially arranged and connected at the top by a sealing connection structure 7. The pressure at the inlet A of the high-pressure material cylinder 8 and the inlet B of the high-pressure oxidant cylinder 9 are not less than 23MPa. The bottom of the high-pressure material cylinder 8 is provided with a nozzle structure 18, which includes but is not limited to a fan-shaped nozzle, a solid cone nozzle, a hollow cone nozzle, and a square nozzle. The auxiliary agent annular space 14 is connected to the feed double helix channel 12 through the feed inner channel 15.

[0029] A high-temperature combustion stabilizing body 10 is arranged on the inner upper side of the device body 2. The outer wall of the high-temperature combustion stabilizing body 10 is a double helix structure, which cooperates with the inner wall of the device body 2 to form a feed double helix channel 12. The upper part of the device body 2 is also provided with a high-pressure auxiliary agent delivery channel 6 and a feed inner channel 15 connected to the inlet of the feed double helix channel 12. A vortex generating device 11 is arranged on the inner wall of the high-temperature combustion stabilizing body 10. The vortex generating device 11 is located below the feed double helix channel 12 and the inlet is connected to the outlet of the feed double helix channel 12. After the material enters the feed double helix channel 12 through the high-pressure auxiliary agent delivery channel 6, it flows out through the feed inner channel 15 into the auxiliary agent annular space 14, and then enters the interior of the reactor.

[0030] A burnt-slag slurry converging cone 3 is arranged at the lower part of the device body 2, and the burnt-slag slurry converging cone 3 is connected to the supercritical hot fluid guiding cone 4 at the lower part thereof. A plurality of burnt-slag slurry outlets D are arranged at the upper part of the side of the burnt-slag slurry converging cone 3, and a supercritical hot fluid outlet C is arranged at the bottom of the supercritical hot fluid guiding cone 4.

[0031] The structural setting of the above-mentioned hydrothermal flame generator 5 can make the materials evenly mixed in the high-temperature stable combustion body 10 and produce a stable flame, ensuring that the organic slurry is fully burned. Depending on the feed flow rate and type, the high-pressure material cylinder 8 can also be used as an auxiliary agent feed channel, and the high-pressure auxiliary agent distribution channel 6 can be used as a material feed channel.

[0032] In this embodiment, the high-temperature combustion stabilizing body 10 is a contraction-expansion structure, which is conducive to accelerating the combustion material into the vortex generating device 11. The high-temperature combustion stabilizing body 10 and the vortex generating device 11 ensure that the burnt slag slurry and the supercritical fluid rotate downward, so as to facilitate the separation of the burnt slag slurry from the supercritical hot fluid at the burnt slag slurry convergence cone 3.

[0033] In this embodiment, the ember slurry converging cone 3 is a microporous structure with a truncated cone profile, a large number of micropores distributed circumferentially, a single large hole opened on the top or the top is covered with medium-sized holes, and the ember slurry outlet D is connected to a guide pipe of a flow control valve 19, and the number of the ember slurry outlets D can be 1, 2, 3 or more.

[0034] According to the above structure, the supercritical hydrothermal combustion process of the present invention is as follows:

[0035] When the device is started, firstly, the supercritical water (taking 400°C, 23MPa as an example) that has been treated to meet the standards is injected from the high-pressure material cylinder inlet A, and then sprayed into the device body 2 through the nozzle structure 18 in the hydrothermal flame generator 5. At this time, the high-pressure auxiliary agent delivery channel 6 and the high-pressure oxidant cylinder 9 are in a closed state. After the supercritical water fills the entire device body 2, the inlet fluid of the high-pressure material cylinder inlet A is switched to an organic slurry (taking coal slurry as an example), and the high-pressure auxiliary agent delivery channel 6 and the high-pressure oxidant cylinder 9 are opened at the same time, and the oxidant (taking oxygen as an example) and the auxiliary agent (taking methanol as an example) at a certain temperature and pressure (for example, 550°C, 25MPa) are injected. The coal slurry, oxygen and methanol trigger thermal spontaneous combustion in the hydrothermal flame generator 5, and stable combustion is achieved in the high-temperature stable combustion body 10. After the fire, a normal temperature coolant (pure water is used as the coolant here) is introduced from the cooling water inlet E, the high-efficiency cooling jacket 1 is started, the wall temperature of the device body 1 is controlled to be below 500°C, and the cooled water flows out through the cooling water outlet F.

[0036] When the device is running stably, each material generates flames in the hydrothermal flame generator 5 and is evenly mixed and stably burned in the high-temperature stable combustion body 10. Thanks to the contraction and expansion structure of the outlet of the high-temperature stable combustion body 10, the burned materials are accelerated into the swirl generating device 11, and the ejected flames are intertwined and move downward in a spiral column, while driving the surrounding fluid to rotate in the same way. Therefore, the flame column continues to exist, and the ember slurry continues to be deposited in the depression of the ember slurry in the ember slurry convergence cone 3 due to inertia. Coal slurry, oxidant and cooling water are continuously introduced into the device at a predetermined flow rate.

[0037] The transport fluids in the high-pressure material cylinder 8 and the high-pressure auxiliary agent delivery channel 6 of the device can be exchanged with each other. For materials that are difficult to ignite, auxiliary agent methanol is introduced into the high-pressure material cylinder 8 in advance, and it and oxygen from the high-pressure oxidant cylinder 9 realize thermal self-ignition and stable combustion in the high-temperature stable combustion body 10. Thereafter, materials that are difficult to ignite are introduced into the high-pressure auxiliary agent delivery channel 6, and then preheated through the feed double helix channel 12 before entering the hydrothermal flame generator 5, thereby achieving stable combustion of the material.

[0038] When the device is discharging the ember slurry, the ember slurry flow rate is controlled by the flow control valve 19 to prevent the outflow from being too fast and affecting the outflow stability of the product at the supercritical hot fluid outlet C. During the whole process, the cooling water is kept to cool the device body 2 continuously.

[0039] In the present invention, the oxidant includes but is not limited to liquid oxygen, oxygen or air, and the organic slurry includes but is not limited to coal slurry, municipal sludge, oil sludge or petrochemical residue.

[0040] In summary, the present invention uses the supercritical hydrothermal combustion device and method with the residue self-separation function for the combustion of solid or solid-containing fuels such as coal and sludge, and can achieve the removal of pollutants NO x 、SO x , and dust source control, which can easily achieve low-cost capture of CO2 and has extremely superior environmental protection performance.

Claims

1. A supercritical hydrothermal combustion device with a residue self-separation function, comprising a device body (2), characterized in that: A hydrothermal flame generator (5) is arranged in the center of the upper part of the device body (2), and a high-temperature combustion stabilizing body (10) is arranged on the upper side. The outer wall of the high-temperature combustion stabilizing body (10) is a double helix structure, which cooperates with the inner wall of the device body (2) to form a feed double helix channel (12). The upper part of the device body (2) is provided with a high-pressure auxiliary agent delivery channel (6) connected to the inlet of the feed double helix channel (12) and a feed inner channel (15) connected to the outlet of the feed double helix channel (12). A swirl generating device (11) is arranged on the inner wall of the high-temperature combustion stabilizing body (10). The lower part of the device body (2) is provided with a burnt slag slurry converging cone (3), which is connected to a supercritical hot fluid guide cone (4) at its lower part. A plurality of burnt slag slurry outlets D are arranged on the upper part of the side of the burnt slag slurry converging cone (3), and a supercritical hot fluid outlet C is arranged at the bottom of the supercritical hot fluid guide cone (4); The high-temperature combustion stabilizing body (10) is a contraction-expansion structure, so as to facilitate the accelerated entry of the burned material into the swirl generating device (11). The high-temperature combustion stabilizing body (10) and the swirl generating device (11) ensure that the burnt slag slurry and the supercritical fluid rotate downward, so as to facilitate the separation of the burnt slag slurry from the supercritical hot fluid at the burnt slag slurry converging cone (3). The ember slurry converging cone (3) is a microporous structure with a truncated cone profile, a large number of micropores distributed in the circumferential direction, a single large hole opened on the top or a top covered with medium-sized holes, the ember slurry outlet D is connected to a guide pipe of a flow control valve (19), and the number of the ember slurry outlets D is 1, 2 or 3.

2. The supercritical hydrothermal combustion device with residue self-separation function according to claim 1, characterized in that: The device body (2) is wrapped by a high-efficiency cooling jacket (1), the high-efficiency cooling jacket (1) is a jacket structure, and the coolant is water, air or heat transfer oil.

3. The supercritical hydrothermal combustion device with residue self-separation function according to claim 1, characterized in that: The device body (2) is wrapped by a high-efficiency cooling jacket (1), the high-efficiency cooling jacket (1) is a single-layer / multi-layer spiral channel structure, and the coolant is water, air or heat transfer oil.

4. The supercritical hydrothermal combustion device with residue self-separation function according to claim 2 or 3, characterized in that: The hydrothermal flame generator (5) is a multi-stage truncated cone structure, wherein the first stage surface at the upper end matches with the inner wall of the device body (2) to form an oxidant annular space (13) communicating with the interior of the reactor, and the second stage surface matches with the inner wall of the device body (2) to form an auxiliary agent annular space (14) communicating with the interior of the reactor. The high-pressure material cylinder (8) passes through the center of the hydrothermal flame generator (5) from top to bottom and is connected to the interior of the device body (2). The high-pressure oxidant cylinder (9) passes through the hydrothermal flame generator (5) or the device body (2) from top to bottom and is connected to the oxidant annular space (13). The auxiliary agent annular space (14) is connected to the feed double helix channel (12) through the feed inner channel (15), so that the materials are evenly mixed in the high-temperature stable combustion body (10) and a stable flame is generated, thereby ensuring that the organic slurry is fully burned.

5. The supercritical hydrothermal combustion device with residue self-separation function according to claim 4, characterized in that: The high-pressure material cylinder (8) and the high-pressure oxidant cylinder (9) are coaxially arranged and connected at the top via a sealing connection structure (7), and the pressure at the inlet A of the high-pressure material cylinder (8) and the inlet B of the high-pressure oxidant cylinder (9) are both not less than 23 MPa.

6. The supercritical hydrothermal combustion device with residue self-separation function according to claim 5, characterized in that: The oxidant annular space (13) reaches the interior of the device body (2) through an oxidant annular outward expansion channel (16) that penetrates the hydrothermal flame generator (5), and the auxiliary agent annular space (14) reaches the interior of the device body (2) through an auxiliary agent annular outward expansion channel (17) that penetrates the hydrothermal flame generator (5).

7. The supercritical hydrothermal combustion device with residue self-separation function according to claim 6, characterized in that: The bottom of the high-pressure material cylinder (8) is provided with a nozzle structure (18). Depending on the feed flow rate and type, the high-pressure material cylinder (8) can be used as an auxiliary agent feed channel, and the high-pressure auxiliary agent delivery channel (6) can be used as a material feed channel.

8. A supercritical hydrothermal combustion method based on the supercritical hydrothermal combustion device with residue self-separation function according to claim 7, characterized in that: When the device is started, supercritical water that has been treated to meet the standards is first injected from the inlet A of the high-pressure material cylinder (8) and sprayed into the device body (2) through the nozzle structure (18). At this time, the high-pressure auxiliary agent delivery channel (6) and the high-pressure oxidant cylinder (9) are in a closed state; After the supercritical water fills the entire device body (2), the fluid at the inlet A of the high-pressure material cylinder (8) is switched to an organic slurry, and at the same time, the high-pressure auxiliary agent delivery channel (6) and the high-pressure oxidant cylinder (9) are opened, and the oxidant and auxiliary agent at the same temperature and pressure are injected, and thermal self-ignition is induced in the hydrothermal flame generator (5), and stable combustion is achieved in the high-temperature stable combustion body (10); A coolant is introduced into the high-efficiency cooling jacket (1) to control the wall temperature of the device body (2) to be below 500° C.; When the device is running stably, each material generates flames in the hydrothermal flame generator (5) and is evenly mixed and stably burned in the high-temperature stable combustion body (10). The burned materials are accelerated into the swirl generating device (11). The ejected flames are intertwined and move downward in a spiral column shape, while driving the surrounding fluid to rotate in the same manner. The burnt ember slurry is continuously deposited in the depression of the burnt ember slurry converging cone (3) due to inertia. When the operation of removing the burnt ember slurry is performed, the flow rate of the burnt ember slurry is controlled by the flow control valve (19) to prevent the outflow from being too fast and affecting the outflow stability of the product at the supercritical hot fluid outlet C. During the whole process, the coolant is kept to continuously cool the device body (2).

9. The supercritical hydrothermal combustion method according to claim 8, characterized in that: The oxidant is liquid oxygen, oxygen or air, and the organic slurry is coal slurry, urban sludge or oil sludge.

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