A supercritical water oxidation treatment system

Abstract

The present invention provides a supercritical water oxidation treatment system, which relates to the technical field of reaction equipment safety. The system includes a reactor, which comprises a reaction tank and a reactant injection device. The reactant injection device is installed on the reaction tank. The reactant injection device includes: a feed pipe passing through the tank wall of the reaction tank; a guiding mechanism installed at one end of the feed pipe inserted into the reaction tank, and the guiding mechanism is used to control the reactant injected into the reaction tank by the feed pipe to rotate around the axis in the height direction of the reaction tank; and a speed regulating device connected to the feed pipe for controlling the discharging speed of the guiding mechanism. By injecting the reactant into the reaction tank through the feed pipe and controlling the reactant in the reaction tank to rotate around the vertical axis to form a cyclone through the guiding mechanism, the present invention can quickly discharge the residues and corrosives generated by the reaction in the flowing area of the reactant downward, control the flowing area of the reaction products, and prevent corrosive substances such as acids in the reaction products from corroding the tank wall.

Description

Technical Field

[0001] The present invention relates to the technical field of reaction equipment safety, and particularly to a supercritical water oxidation treatment system. Background Art

[0002] Supercritical water oxidation technology (SCWO) is an advanced oxidation technology that utilizes the special properties of oxidants in the supercritical state to enable organic substances and oxidants to rapidly undergo oxidation reactions in supercritical water to completely decompose organic substances. SCWO is a new waste treatment technology proposed and developed by American scholar Modell in the 1980s. It has the characteristics of energy conservation, high efficiency, and strong applicability, and has attracted the attention of environmental protection workers at home and abroad.

[0003] The supercritical water oxidation technology can treat various toxic organic wastewater, organic waste, sludge, and human metabolites. Compared with other traditional methods, it has many advantages: high efficiency, wide application range, can be used for various toxic and difficult-to-degrade organic substances, the products do not require further treatment, and it can conduct self-heat exchange when the organic matter content is low, so no external heating is required, the reaction speed is fast, the reactor structure is simple, and the treatment capacity is large.

[0004] The existing supercritical water oxidation technology needs to carry out reactions under high temperature and high pressure conditions. The oxidant decomposes organic substances into gases such as carbon dioxide, water, and nitrogen, and inorganic elements are converted into acids and salts. Corrosive substances such as acids generated under supercritical conditions are likely to corrode the equipment, affect the service life of the device, and pose safety hazards. Summary of the Invention

[0005] The present invention provides a supercritical water oxidation treatment system to solve the defect that corrosive substances such as acids generated by the supercritical water oxidation treatment system in the prior art are likely to corrode the equipment, affect the service life of the device, and pose safety hazards, and to implement a supercritical water oxidation treatment system.

[0006] The present invention provides a supercritical water oxidation treatment system, including: a reactor, the reactor includes a reaction tank and a reactant injection device, and the reactant injection device is installed on the reaction tank;

[0007] The reactant injection device includes:

[0008] A propellant pipe passing through the tank wall of the reaction tank;

[0009] A guiding mechanism installed at one end of the propellant pipe inserted into the reaction tank, and the guiding mechanism is used to control the reactant injected into the reaction tank through the propellant pipe to rotate around the axis in the height direction of the reaction tank;

[0010] A speed control device, connected to the propellant pipe, for controlling the propellant output speed of the guiding mechanism.

[0011] According to the supercritical water oxidation treatment system provided by the present invention, the guiding mechanism includes a nozzle, the nozzle has a propellant outlet, and there is a gap between the propellant outlet and the tank wall.

[0012] According to the supercritical water oxidation treatment system provided by the present invention, the propellant outlet is adapted to discharge the propellant towards the top of the reaction tank.

[0013] According to the supercritical water oxidation treatment system provided by the present invention, the nozzle includes a plurality of the propellant outlets, and at least one of the plurality of propellant outlets is adapted to discharge the propellant towards the top of the reaction tank.

[0014] According to the supercritical water oxidation treatment system provided by the present invention, the guiding mechanism further includes a guiding member, the guiding member has a guiding surface, and the propellant outlet direction of the nozzle intersects the guiding surface obliquely;

[0015] The guiding surface is inclined relative to the tank wall for guiding the reactant sprayed out by the nozzle to flow towards one side close to the central axis in the height direction of the reaction tank.

[0016] According to the supercritical water oxidation treatment system provided by the present invention, the guiding surface is further used for guiding the reactant sprayed out by the nozzle to flow towards the bottom direction of the reaction tank.

[0017] According to the supercritical water oxidation treatment system provided by the present invention, there are a plurality of the guiding mechanisms, and the plurality of guiding mechanisms are arranged at intervals around the axis in the height direction inside the reaction tank.

[0018] According to the supercritical water oxidation treatment system provided by the present invention, there are a plurality of the guiding mechanisms, and the plurality of guiding mechanisms are arranged at intervals in the height direction of the reaction tank.

[0019] According to the supercritical water oxidation treatment system provided by the present invention, there are a plurality of the propellant pipes, and each propellant pipe is connected to at least one of the guiding mechanisms.

[0020] According to the supercritical water oxidation treatment system provided by the present invention, the reactant injection device further includes a converging agent pipe, and the converging agent pipe is connected to the speed control device and the propellant pipe.

[0021] According to the supercritical water oxidation treatment system provided by the present invention, a slag discharge port is provided at the bottom of the reaction tank, the bottom of the slag discharge port is connected to a slag discharge pipe, and a valve is provided on the slag discharge pipe.

[0022] According to the supercritical water oxidation treatment system provided by the present invention, there are at least two valves, and the two valves are arranged at intervals on the slag discharge pipe.

[0023] According to the supercritical water oxidation treatment system provided by the present invention, the reactor further includes a heating device. The reaction tank is provided with a liquid inlet, a gas collection port and a pressure relief port. A second connection hole is further provided on the tank wall of the reaction tank. The heating device is used to pass through the second connection hole and heat the inside of the reaction tank.

[0024] According to the supercritical water oxidation treatment system provided by the present invention, the supercritical water oxidation treatment system further includes a temperature detection device, and the temperature detection device is used to detect the temperature inside the reaction tank.

[0025] According to the supercritical water oxidation treatment system provided by the present invention, the supercritical water oxidation treatment system further includes a pressure detection device, and the pressure detection device is used to detect the pressure inside the reaction tank.

[0026] According to the supercritical water oxidation treatment system provided by the present invention, the supercritical water oxidation treatment system further includes a pressure regulating valve and a controller connected in communication. The pressure regulating valve is installed outside the pressure relief port. The controller is also connected in communication with the pressure detection device. The controller is used to control the opening degree of the pressure regulating valve according to the pressure value detected by the pressure detection device.

[0027] For the supercritical water oxidation treatment system provided by the present invention, the reactant is injected into the reaction tank through a feed pipe, and the reactant inside the reaction tank is controlled by a guiding mechanism to rotate around a vertical axis and form a cyclone, which is the same as the swirl of the ocean or lake. The rotating reactant wraps the reaction product, and can quickly discharge the acidic and other corrosive substances generated by the reaction in the area where the reactant flows downward, and discharge them through the discharge port at the bottom of the reaction tank. For the reaction system of oxidizing and recovering wastewater by supercritical water oxidation reaction, the rotating and flowing reactant can accelerate the reaction efficiency between the wastewater and the oxidant in the reaction tank. Compared with the reactor that mixes various reactants outside the reaction tank and guides them into the reaction tank together, it can control the flow area of the reaction product and prevent the acidic and other corrosive substances in the reaction product from corroding the tank wall.

[0028] Moreover, the discharge speed of the reactant discharged by the guiding mechanism is controlled by a speed regulating device, and is preferably controlled within a preset range. When ensuring the flow rate for forming a cyclone, the probability that the acidic and other corrosive substances generated by the reaction of the reactant contact the tank wall due to centrifugal force is minimized, so that the acidic and other corrosive substances generated in the flow path area of the reactant can flow with the reactant without contacting the tank wall, and finally be discharged through the discharge port of the reaction tank. The present invention controls the agent discharge speed of the guiding mechanism through a speed regulating device, reduces the probability of the slag and acidic corrosive substances touching the tank wall, and reduces the risk of the equipment being corroded by the corrosive substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic diagram of the internal structure of the supercritical water oxidation treatment system provided by the present invention;

[0031] Figure 2 It is one of the schematic diagrams of the horizontal cross-section of the reaction tank provided by the present invention;

[0032] Figure 3 It is a schematic diagram of the nozzle structure provided by the present invention;

[0033] Figure 4 It is another schematic diagram of the horizontal cross-section of the reaction tank provided by the present invention;

[0034] Figure 5 It is a schematic diagram of the inclined setting structure of the guiding member and the tank wall provided by the present invention;

[0035] Figure 6 It is the third schematic diagram of the horizontal cross-section of the reaction tank provided by the present invention;

[0036] Figure 7 It is a schematic diagram of the external structure of the supercritical water oxidation treatment system provided by the present invention;

[0037] Figure 8 It is a schematic diagram of the gas collecting hood structure provided by the present invention.

[0038] Reference numerals:

[0039] 100: Reagent injection device; 110: Reagent inlet pipe; 120: Guiding mechanism;

[0040] 121: Nozzle; 122: Reagent outlet; 123: Guiding member;

[0041] 124: Guiding surface; 130: Speed regulating device; 140: Reagent collecting pipe;

[0042] 150: Annular pipe;

[0043] 200: Reaction tank; 210: Tank wall; 211: First connection hole;

[0044] 212: Second connection hole; 213: Vertical central axis: 214: Shortest connection line;

[0045] 220: Slag discharge port; 230: Slag discharge pipe; 231: Valve;

[0046] 240: Inlet port; 250: Gas collection port; 260: Pressure relief port;

[0047] 270: Heating device; 280: Gas collection hood. Detailed implementation manner

[0048] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts belong to the scope of protection of the present invention.

[0049] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "first", "second", etc. are used for numbering product components for clear description and do not represent any substantial difference. "Upper", "lower", "inner", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0050] It should be noted that the description "within... range" in the present invention includes the end values at both ends. For example, "within the range of 10 to 20" includes the end values 10 and 20 at both ends of the range.

[0051] It should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the invention can be understood according to specific circumstances.

[0052] Specifically, for other reactions such as supercritical water oxidation reactions, there are also cases where reactants generate corrosive substances such as acids, which come into contact with the inner wall of the reaction tank and even adhere to the inner wall of the reaction tank, making it easy to corrode the reaction tank. The improvement of the supercritical water oxidation treatment system in this embodiment can be applied to other reaction devices with the same problems.

[0053] Specifically, the following is combined with Figures 1 - 7 Describe the supercritical water oxidation treatment system of the present invention.

[0054] This embodiment provides a reactant injection device for being installed on the reaction tank 200 and being adapted to inject reactants into the reaction tank 200, including:

[0055] The propellant pipe 110 is used to pass through the tank wall 210 of the reaction tank 200;

[0056] The guiding mechanism 120 is installed at one end of the propellant pipe 110 for inserting into the reaction tank 200. The guiding mechanism 120 is used to control the reactant entering the reaction tank 200 to rotate around the axis in the height direction inside the reaction tank 200;

[0057] The speed regulating device 130 is connected to the propellant pipe 110 and is used to control the discharging speed of the guiding mechanism 120 within a preset range.

[0058] Specifically, the height direction of the reaction tank 200 refers to the vertical direction in the working state, that is, the connection direction between the top and the bottom of the reaction tank 200. The height direction can be inclined relative to the vertical direction, but cannot be perpendicular to the vertical direction.

[0059] Among them, the reactant in this embodiment can be liquid, gas or solid. The reactant reacts in the reaction tank 200 to generate corrosive substances such as acids, such as acidic liquids or acidic residues. The reactant can react with other reactants in the reaction tank 200 or can react under certain conditions in the reaction tank 200. Specifically, for the reaction system of oxidizing and recovering wastewater by supercritical water oxidation, the reactant is an oxidizing agent with oxidizing property.

[0060] This embodiment can be matched with the propellant pipe 110 to prepare a reaction tank 200 with perforations, and the propellant pipe 110 penetrates into the reaction tank 200 through the perforations. Preferably, perforations can also be opened on the tank wall 210 of the existing reaction tank 200 to match the reactant injection device described in this embodiment.

[0061] Specifically, a cut-off valve can be provided on the propellant pipe 110. The pipeline before the propellant pipe 110 enters the reaction tank 200 is made of PP, fiberglass or stainless steel 304, and the pipeline after entering the reaction tank 200 is made of high-temperature and corrosion-resistant materials such as nickel-chromium.

[0062] The guiding mechanism 120 is a device with the function of adjusting the discharging direction, or can also be the port at one end of the propellant pipe 110 inserted into the reaction tank 200. Taking the cylindrical reaction tank 200 as an example, the guiding mechanism 120 can control the reactant sprayed out by the propellant pipe 110 to flow along the direction tangent to the tank wall 210, and the reactant can rotate around the vertical axis in the reaction tank 200 to generate a cyclone. Preferably, the axis in the height direction described in this embodiment refers to the axis along the vertical direction perpendicular to the ground when the reaction tank 200 is placed in the working state. There are multiple vertical axes in the reaction tank 200, such as the central axis of the cylindrical reaction tank 200 is one of the vertical axes. The guiding mechanism 120 described in this embodiment controls the reactant to rotate around the vertical axis, preferably around the vertical central axis, to generate a cyclone.

[0063] In the reactant injection device described in this embodiment, the reactant is injected into the reaction tank 200 through the feed pipe 110, and the reactant in the reaction tank 200 is controlled by the guiding mechanism 120 to rotate around the vertical axis and form a cyclone, which is the same as the vortex flow of the ocean or lake. The rotating reactant wraps the reaction product, and can quickly discharge the corrosive substances such as acid generated by the reaction in the flowing area of the reactant downward, and discharge through the discharge port at the bottom of the reaction tank 200. For the reaction system of oxidizing and recovering wastewater by supercritical water oxidation reaction, the rotating reactant can accelerate the reaction efficiency between the wastewater and the oxidant in the reaction tank. Compared with the reactor that mixes various reactants outside the reaction tank 200 and guides them into the reaction tank 200 together, it can control the flowing area of the reaction product and prevent the corrosive substances such as acid in the reaction product from corroding the tank wall.

[0064] Moreover, the discharge speed of the reactant discharged by the guiding mechanism 120 is controlled by the speed regulating device 130, and is preferably controlled within a preset range. When ensuring the flow rate for forming the cyclone, the probability that the corrosive substances such as acid generated by the reaction of the reactant contact the tank wall 210 due to centrifugal force is minimized, so that the corrosive substances such as acid generated in the flowing path area of the reactant can flow with the reactant without contacting the tank wall 210, and finally be discharged through the discharge port of the reaction tank 200. In this embodiment, the speed regulating device 130 controls the agent discharge speed of the guiding mechanism 120, reduces the probability of the slag and acidic corrosive substances touching the tank wall 210, and reduces the risk of the equipment being corroded by the corrosive substances.

[0065] In the present invention, the guiding mechanism 120 installed at the agent discharge end of the feed pipe 110 is used to control the formation of a vortex flow in the reaction tank 200. Compared with the stirring impeller, it can reduce the exposed area of the metal components in the reaction tank 200 and prevent the stirring impeller from being corroded by acidic substances.

[0066] Specifically, this embodiment provides a specific implementation manner of the guiding mechanism 120. The guiding mechanism 120 includes a nozzle 121, and the nozzle 121 has an agent discharge port 122. The setting direction of the agent discharge port 122 includes: the vertical plane where the shortest connecting line between the tank wall 210 and the agent discharge port 122 is located, and is inclined or vertically intersects with the agent discharge direction of the agent discharge port 122.

[0067] Specifically, in combination with Figure 2As shown, taking the cylindrical reaction tank 200 as an example, and the guiding mechanism 120 controls the reactant to rotate around the vertical central axis 213 of the reaction tank 200. The agent outlet 122 is arranged inside the cylindrical reaction tank 200. The shortest connection line 214 between the agent outlet 122 and the tank wall 210. At this time, the shortest connection line 214 coincides with the radial direction of the cylindrical reaction tank 200 passing through the agent outlet 122. And the vertical plane where the shortest connection line 214 is located refers to the plane that vertically passes through the shortest connection line 214 in the vertical direction when the reaction tank 200 is placed along its working state inside the reaction tank 200. When the agent outlet direction of the agent outlet 122 of the guiding mechanism 120 is vertically facing the tank wall 210, the reactant will diffuse in all directions when it reaches the tank wall 210, and thus there will be no rotational movement inside the reaction tank 200. In this embodiment, the agent outlet direction of the agent outlet 122 is set to be inclined or vertically intersect with this vertical plane, so as to control that the agent outlet 122 does not vertically discharge the agent towards the approaching tank wall 210, so as to ensure that the guiding mechanism 120 can control the reactant to rotate around the axis in the height direction inside the reaction tank 200 and generate a cyclone.

[0068] Preferably, in combination with Figure 2 As shown, the included angle between the agent outlet direction of the agent outlet 122 and the shortest connection line 214 is greater than or equal to 90 degrees, so as to ensure that the reactant discharged from the agent outlet 122 flows towards the inner side of the reaction tank 200, and to prevent the corrosive substances such as acid generated in the reactant reaction area from contacting the tank wall 210 to a greater extent.

[0069] Among them, for a non-cylindrical reaction tank 200, such as a square or polygonal reaction tank 200, it is similar to the cylindrical reaction tank 200. The purpose of setting the agent outlet direction of the agent outlet 122 in this embodiment is to prevent the agent outlet 122 from vertically discharging the reactant towards the approaching tank wall area, and to ensure that a cyclone is generated inside the reaction tank 200.

[0070] Furthermore, the setting direction of the agent outlet 122 also includes: the agent outlet 122 is adapted to discharge the agent along one side from the bottom to the top of the reaction tank 200. For example, the agent outlet 122 is inclined upward so that the reactant discharged from the agent outlet 122 is mixed with the reactant flowing downward from above, thereby improving the reaction rate. For example, for a reaction system that oxidizes and recovers wastewater by supercritical water oxidation, the wastewater as a whole flows downward inside the reaction tank 200. The agent outlet 122 is inclined upward so that the oxidant ejected from the agent outlet 122 can be well mixed with the downward flowing wastewater, thereby improving the reaction efficiency between the oxidant and the wastewater.

[0071] Preferably, the nozzle 121 described in this embodiment includes a plurality of agent outlets 122, and at least one of the plurality of agent outlets 122 is adapted to discharge the agent along one side from the bottom to the top of the reaction tank 200.

[0072] The other agent outlet 122 can discharge agents horizontally along the reaction tank 200 or discharge agents downward along the horizontal direction of the reaction tank 200.

[0073] In this embodiment, taking two agent outlets 122 as an example, in combination with Figure 3 As shown, the discharging direction of the upper agent outlet 122 is upward, and the discharging direction of the lower agent outlet 122 is horizontal.

[0074] In this embodiment, the reactant is ejected simultaneously upward and horizontally. On the one hand, it can improve the reaction efficiency between the oxidant and the wastewater. At the same time, the reactant ejected horizontally forms a cyclone in the reaction tank 200, which can prevent the corrosion of the tank wall by acidic and other corrosion products while increasing the oxidation rate of the oxidant to the wastewater.

[0075] Furthermore, the guiding mechanism 120 described in this embodiment further includes a guiding member 123. The guiding member 123 has a guiding surface 124. The discharging direction of the nozzle 121 intersects the guiding surface 124 obliquely. The guiding surface 124 is used to guide the reactant ejected by the nozzle 121 to flow toward the side close to the central axis in the height direction of the reaction tank.

[0076] In combination with Figure 4 As shown, the guiding member 123 described in this embodiment is a guide plate. The side of the guide plate close to the nozzle 121 is the guiding surface 124. The guiding surface 124 can be a plane, an arc surface, or other special-shaped surfaces. When the reactant ejected by the nozzle 121 can rotate around the axis in the height direction of the reaction tank 200, the provided guiding surface 124 can guide the reactant ejected by the nozzle 121 to flow toward the side close to the rotation axis. For example, taking the cylindrical reaction tank 200 as an example, when the ejection direction of the nozzle 121 is as Figure 4 shown and is biased toward one side of the vertical central axis, the guiding surface 124 can guide the reactant so that the reactant ejected by the nozzle 121 flows toward the vertical central axis side, causing the reactant to approach the rotation axis side after being ejected from the nozzle 121, forming a cyclone. The flow rate at the agent outlet 122 of the nozzle 121 is relatively high, and the guiding surface 124 can also prevent acidic and other corrosive substances generated in the reactant flow area from impacting the tank wall 210 along with the reactant ejected by the nozzle 121.

[0077] Specifically, the guiding member 123 is made of heat-resistant and corrosion-resistant materials such as nickel-chromium. The installation angle can be adjusted and it cooperates with the nozzle 121 to form a cyclone of the oxidant in the cylinder under supercritical conditions, and timely discharge the product slag and corrosive substances from the device, reducing the risk of equipment corrosion.

[0078] Preferably, the guiding surface 124 is also used to guide the reactant ejected by the nozzle 121 to flow downward along the horizontal direction of the reaction tank 200.

[0079] Such as Figure 5As shown, the guiding member 123 takes the guiding plate as an example. The guiding plate is not only inclined to the right in the diameter direction compared with the tank wall 210, but also inclined to the right in the downward direction compared with the tank wall 210. The nozzle 121 is located below the guiding surface 124. One of the agent outlets 122 sprays the reactant towards the guiding surface 124 in the horizontal direction, and rotates towards the side close to the vertical central axis under the action of the guiding surface 124; the other agent outlet 122 sprays the reactant towards the guiding surface 124 in the inclined upward direction, and on the one hand rotates towards the side close to the vertical central axis under the action of the guiding surface 124, and on the other hand flows upward.

[0080] Preferably, there are multiple guiding mechanisms 120, and the multiple guiding mechanisms 120 are used for being arranged at intervals around the vertical axis. As Figure 2 shown, there are 2, Figure 6 shown, there are 6. The 6 guiding mechanisms 120 are arranged at intervals along the axis in the height direction inside the reaction tank 200, preferably arranged in central symmetry. The nozzles 121 of the multiple guiding mechanisms 120 spray the reactant simultaneously to form a cyclone.

[0081] Preferably, there are multiple guiding mechanisms 120, and the multiple guiding mechanisms 120 are used for being arranged at intervals along the height direction of the reaction tank 200. As Figure 1 shown, there are four guiding mechanisms 120 along the height direction to spray the reactant at multiple positions in the height direction of the reaction tank 200, and form a cyclone with a corresponding height inside the reaction tank 200 to improve the reaction efficiency.

[0082] Preferably, there are multiple guiding mechanisms 120 both in the height direction and the circumferential direction of the reaction tank 200 to improve the reaction efficiency.

[0083] Specifically, when there are multiple guiding mechanisms 120, one feed pipe 110 can pass through the tank wall 210 and be branched inside the reaction tank 200. Preferably, there are multiple feed pipes 110 in this embodiment, and each feed pipe 110 is connected to at least one guiding mechanism 120. As Figure 1 shown in Figure 7 and shown, each feed pipe 110 passes through the tank wall 210 and is connected to one guiding mechanism 120 inside the reaction tank 200. The separately arranged feed pipes 110 can control the agent output of each guiding mechanism 120 separately and can control the injection amount of the reactant. Moreover, the separately arranged feed pipes 110 can reduce the exposed area of the feed pipes inside the reaction tank 200 and prevent corrosive substances such as acid inside the reaction tank 200 from corroding the feed pipes 110.

[0084] Preferably, the reactant injection device described in this embodiment further includes a reactant collecting pipe 140, and the reactant collecting pipe 140 is respectively connected to the speed regulating device 130 and the reactant inlet pipe 110. The speed regulating device 130 injects the reactant into the reactant inlet pipe 110 through the reactant collecting pipe 140 and controls the injection speed of the reactant entering the reaction tank 200.

[0085] Preferably, as shown in combination with Figure 7 For multiple reactant collecting pipes 140 of multiple reactant inlet pipes 110, the multiple reactant collecting pipes 140 can be connected through an annular pipe 150.

[0086] Preferably, this embodiment further provides a reactor, which includes the reactant injection device described in any of the above embodiments, and further includes a reaction tank 200. A first connection hole 211 is provided on the tank wall 210 of the reaction tank 200, and the first connection hole 211 is used for the reactant inlet pipe 110 of the reactant injection device to pass through and be hermetically connected to the reactant inlet pipe 110.

[0087] Preferably, the reaction tank 200 is assembled by a cylinder body and a top cover, and the cylinder body and the top cover are hermetically connected through a sealing member such as a gasket. Flanges and sealing members are provided for all the holes opened on the reaction tank 200.

[0088] The cylinder body and the top cover are made of high-temperature resistant materials such as nickel-chromium alloy or carbon steel + refractory materials. The cylinder body is designed in a circular shape, the top cover is designed in a flat shape, and the thickness is between 10 mm and 30 mm. The top cover and the cylinder body are fastened with high-strength bolts, and a sealing ring is designed between the top cover and the cylinder body. The sealing ring is made of high-temperature resistant material. The cylinder body has multiple temperature and pressure openings for monitoring the temperature and pressure inside the cylinder body. All the temperature and pressure openings are designed with sleeves and flanges for convenient installation.

[0089] Among them, a reaction tank 200 with perforations can be prepared to match the reactant inlet pipe 110, and the reactant inlet pipe 110 penetrates through the perforations and enters the reaction tank 200. Preferably, perforations can also be opened on the tank wall 210 of the existing reaction tank 200 to match the reactant injection device described in this embodiment.

[0090] Preferably, a slag discharge port 220 is provided at the bottom of the reaction tank 200, and a slag discharge pipe 230 is connected to the bottom of the slag discharge port 220. A valve 231 is provided on the slag discharge pipe 230.

[0091] Preferably, the valve 231 is an electric valve. The slag generated in the reaction tank 200 moves towards the bottom of the reaction tank 200 under the action of air cyclone and gravity, and is discharged through the slag discharge port 220 provided at the bottom of the reaction tank 200. The valve 231 can control the flow and closing of the slag discharge pipe 230, and the generated slag is discharged into the corresponding collection device by opening the valve 231.

[0092] Preferably, there are at least two valves 231, and the two valves 231 are arranged at intervals on the slag discharge pipe 230. Specifically, the two valves 231 are arranged at intervals along the flow direction inside the slag discharge pipe 230. When slag is generated in the reaction tank 200 during the reaction, the front valve 231 is opened and the rear valve 231 is closed. Under the action of gravity, the slag passes through the slag discharge pipe 230, and the slag passes through the rear valve 231 and is discharged into the corresponding collection device. Since the front valve 231 is closed, the reactant in the reaction tank 200 will not flow out, realizing slag discharge without shutting down the reactor.

[0093] Preferably, on the basis of the above-mentioned embodiment, the present embodiment further provides a supercritical water oxidation treatment system, including the reactor described in any of the above embodiments.

[0094] Specifically, in combination with Figure 1 、 Figure 7 and Figure 8 as shown, the reactor further includes a heating device 270. The reaction tank 200 is provided with a liquid inlet 240, a gas collection port 250 and a pressure relief port 260. A second connection hole 212 is also provided on the tank wall 210 of the reaction tank 200. The heating device 270 is used to pass through the second connection hole 212 and heat the inside of the reaction tank 200.

[0095] Preferably, a gas collection hood 280 is further provided inside the reaction tank 200, and the gas collection hood 280 is connected to the gas collection port 250. The gas collection hood 280 is made of heat-resistant and corrosion-resistant materials. The gas collection hood 280 is designed with a certain inclination angle, and the installed gas collection hood 280 can collect the tail gas generated in the reaction tank to the maximum extent. A variable-frequency fan is installed outside the gas collection port 250 to lead the tail gas out of the reaction tank.

[0096] The liquid inlet 240 is used to inject wastewater into the reaction tank 200. When injecting wastewater, the gas collection port 250 and the pressure relief port 260 are closed. A liquid inlet pipe and supporting valves and instruments are provided outside the liquid inlet 240. The pipeline before entering the reaction tank 200 is made of PP, fiberglass or stainless steel 304 material, and the pipeline after entering the reaction tank 200 is made of high-temperature-resistant materials such as nickel-chromium alloy.

[0097] The heating device 270 needs to be preheated in advance. The heating device can be one or a combination of heating devices, plasma or natural gas. When the temperature and pressure in the reaction tank 200 reach the set values, the reactant injection device injects an oxidant into the reaction tank 200 for an oxidation reaction.

[0098] Under the action of the reactant injection device, the oxidant flows downward in a spiral rotation manner within the reaction tank 200, and by controlling the injection speed of the oxidant, the slag generated in the contact area between the oxidant and the wastewater gradually flows downward. Under the action of the shearing force and gravity, the generated corrosive substances such as acids are not easily in contact with the tank wall 210, preventing the corrosion of the tank wall 210.

[0099] Moreover, the gas after the reaction is collected through the gas collection port 250, the pressure value within the reaction tank 200 is controlled through the pressure relief port 260, and the temperature value within the reaction tank 200 is controlled through the heating device 270.

[0100] The slag generated by the reaction within the reaction tank 200 flows downward and is finally discharged through the slag discharge port 220 at the bottom.

[0101] Preferably, the supercritical water oxidation treatment system further includes a temperature detection device for detecting the temperature within the reaction tank 200. A plurality of temperature detection devices are installed within the reaction tank 200 to determine the temperatures at different positions within the reaction tank 200. The temperature detection device uses a thermocouple or a thermal resistor, and all the temperature detection devices are of the plug-in type. The connection mode between the temperature detection device and the tank wall 210 is flange type or threaded connection, which is convenient for disassembly.

[0102] Preferably, the supercritical water oxidation treatment system further includes a pressure detection device for detecting the pressure within the reaction tank 200. A plurality of pressure detection devices are installed within the reaction tank 200. The pressure detection device uses a pressure transmitter. If the pressure within the reaction tank 200 is too high, exceeding the maximum design pressure value of the reaction tank 200, the pressure relief port 260 will automatically open for pressure relief to ensure the safety of the device, improving the safety of the device. A plurality of pressure detection devices are installed within the reaction tank 200 to provide accurate pressure values for the device.

[0103] Preferably, the supercritical water oxidation treatment system described in this embodiment further includes a pressure regulating valve and a controller connected in communication. The pressure regulating valve is installed outside the pressure relief port 260, and the controller is also connected in communication with the pressure detection device. The controller is used to control the opening degree of the pressure regulating valve according to the pressure value detected by the pressure detection device, so as to control the opening degree of the pressure regulating valve when the pressure gradually increases during the continuous injection of the oxidant, so that the pressure value within the reaction tank 200 remains constant.

[0104] The supercritical water oxidation treatment system provided by the present invention has a simple and delicate structure, strong practicability, a wide range of applications, and the device is in a closed environment, enabling the wastewater to reach the standard for treatment and reducing environmental pollution.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A supercritical water oxidation treatment system, characterized in that, Comprising: A reactor, the reactor including a reaction tank and a reactant injection device, the reactant injection device being installed on the reaction tank; The reactant injection device includes: A propellant pipe, passing through the wall of the reaction tank; A guiding mechanism, installed at one end of the propellant pipe inserted into the reaction tank, the guiding mechanism being used to control the reactant injected into the reaction tank through the propellant pipe to rotate around the axis in the height direction inside the reaction tank; A speed control device, connected to the propellant pipe, for controlling the agent discharge speed of the guiding mechanism; The guiding mechanism includes a nozzle, the nozzle having an agent discharge port, and there is a gap between the agent discharge port and the tank wall; The guiding mechanism further includes a guiding member, the guiding member having a guiding surface, and the agent discharge direction of the nozzle intersects the guiding surface obliquely; The guiding surface is inclined relative to the tank wall, for guiding the reactant ejected from the nozzle to flow towards the side close to the central axis in the height direction of the reaction tank.

2. The supercritical water oxidation treatment system according to claim 1, wherein The agent discharge port is adapted to discharge the agent towards the top of the reaction tank.

3. The supercritical water oxidation treatment system according to claim 1, wherein The nozzle includes a plurality of the agent discharge ports, and at least one of the plurality of agent discharge ports is adapted to discharge the agent towards the top of the reaction tank.

4. The supercritical water oxidation treatment system according to claim 1, wherein, The guiding surface is further used to guide the reactant ejected from the nozzle to flow towards the bottom of the reaction tank.

5. The supercritical water oxidation treatment system according to claim 1, wherein There are a plurality of the guiding mechanisms, and the plurality of guiding mechanisms are arranged at intervals around the axis in the height direction inside the reaction tank.

6. The supercritical water oxidation treatment system according to claim 1, wherein, There are a plurality of the guiding mechanisms, and the plurality of guiding mechanisms are arranged at intervals along the height direction of the reaction tank.

7. The supercritical water oxidation treatment system according to claim 5 or 6, characterized in that, There are a plurality of the propellant pipes, and each propellant pipe is connected to at least one of the guiding mechanisms.

8. The supercritical water oxidation treatment system according to claim 7, characterized in that, The reactant injection device further includes a converging agent pipe, the converging agent pipe being connected to the speed control device and the propellant pipe.

9. The supercritical water oxidation treatment system according to claim 1, wherein A slag discharge port is provided at the bottom of the reaction tank, the bottom of the slag discharge port is connected to a slag discharge pipe, and a valve is provided on the slag discharge pipe.

10. The supercritical water oxidation treatment system according to claim 9, wherein, There are at least two of the valves, and the two valves are arranged at intervals on the slag discharge pipe.

11. The supercritical water oxidation treatment system according to claim 1, characterized in that, The reactor further includes a heating device, the reaction tank is provided with a liquid inlet, a gas collection port and a pressure relief port, and a second connection hole is further provided on the wall of the reaction tank, and the heating device is used to pass through the second connection hole and heat the inside of the reaction tank.

12. The supercritical water oxidation treatment system according to claim 11, wherein The supercritical water oxidation treatment system further includes a temperature detection device, the temperature detection device being used to detect the temperature inside the reaction tank.

13. The supercritical water oxidation treatment system according to claim 12, wherein The supercritical water oxidation treatment system further includes a pressure detection device, the pressure detection device being used to detect the pressure inside the reaction tank.

14. The supercritical water oxidation treatment system according to claim 13, characterized in that, The supercritical water oxidation treatment system further includes a pressure regulating valve and a controller connected in communication, the pressure regulating valve is installed outside the pressure relief port, the controller is further connected in communication with the pressure detection device, and the controller is used to control the opening degree of the pressure regulating valve according to the pressure value detected by the pressure detection device.

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