Online salt removal and elimination supercritical hydrothermal combustion type multi-element thermal fluid generating device and method

Abstract

The invention discloses an online salt removal and elimination supercritical hydrothermal combustion type multi-element thermal fluid generating device and method. The device comprises a salt elimination bottom, a frame type stirrer is arranged in the salt elimination bottom, the salt elimination bottom is communicated with a salt elimination section spiral conveyor, and the salt elimination section spiral conveyor is communicated with a salt elimination opening; the salt discharging bottom is provided with overtemperature protection equipment, the overtemperature protection equipment is connected with a cooling water system and a heat exchanger, an outlet of the heat exchanger is connected with a flash tank, the flash tank is connected with the salt discharging opening and further connected with an external spiral conveyor, and the heat exchanger is further connected with a condensate water collecting device. Through communication and linkage of the salt discharge bottom, the overtemperature protection equipment, the heat exchanger and the flash tank assembly, a complete closed-loop system from desalination and salt discharge to temperature control and heat energy recovery is formed, and energy loss and fault risks of intermediate links are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of supercritical hydrothermal combustion, and in particular to an online desalination and salt removal supercritical hydrothermal combustion type multi-element thermal fluid generating device and method. Background Art

[0002] Supercritical water refers to water at a temperature ≥374.15°C and a pressure ≥22.12 MPa (i.e., above its critical point). Compared to normal water, supercritical water exhibits unique properties: reduced density, lower viscosity, increased diffusion coefficient, decreased hydrogen bond stability and number, and a dielectric constant much smaller than that of normal water. This unique property makes it a non-polar solvent with high diffusivity and excellent mass transfer. Furthermore, unlike normal water, which typically decomposes into ions, supercritical water reacts with an increased number of free radicals, while ion reactions are weakened. This has led to the development of a range of supercritical water-related technologies, such as supercritical water oxidation, supercritical water vaporization, supercritical hydrothermal modification, and supercritical hydrothermal synthesis, which have yielded numerous achievements in the fields of efficient and clean conversion of fossil energy, harmless wastewater treatment, petroleum development and processing, and nanomaterial synthesis.

[0003] Supercritical water, as an excellent mass transfer medium, allows organic matter and gases that are insoluble in normal water to dissolve in it. However, this reduces the solubility of inorganic compounds, leading to one of the key challenges in supercritical water technology: inorganic salt deposition. Under high temperature and high pressure, inorganic salts tend to deposit in various parts of the system, such as pipes, heat exchangers, and reactors. These deposits not only reduce the system's heat transfer efficiency and increase energy consumption, but can also cause corrosion and wear to equipment, shortening its service life. More seriously, salt deposition can cause system blockages, impacting normal process operation, and even leading to safety incidents.

[0004] Traditionally, to address these inorganic salt deposits, systems have typically required periodic desalination system shutdowns. This not only increases operating costs but also reduces production efficiency. Especially in industrial processes that require continuous operation, the losses incurred during desalination shutdowns are incalculable.

[0005] Furthermore, traditional desalination methods often rely on chemical cleaning or physical scraping, which are not only complex to operate but can also cause additional damage to the system. Furthermore, the waste salt after treatment must be properly disposed of to avoid environmental pollution.

[0006] Therefore, developing a technology capable of online salt removal is of great significance for the promotion and application of supercritical hydrothermal combustion technology. This technology can not only improve the operating efficiency and safety of the system, but also reduce production costs and environmental risks. The present invention aims to address this problem and provides an efficient, continuous, and safe online salt removal method, providing new impetus for the development of supercritical hydrothermal combustion technology. Summary of the Invention

[0007] The purpose of the present invention is to provide an online desalination supercritical water thermal combustion type multi-element thermal fluid generating device and method, and an innovative design is made to overcome the shortcomings of the existing technology by targeting the problem of inorganic salt deposition in supercritical water technology.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides an online desalination and supercritical hydrothermal combustion type multi-element thermal fluid generating device, comprising a desalination bottom, a frame-type agitator being provided inside the desalination bottom, a salt discharge section spiral conveyor being provided in communication with the desalination bottom, and a salt discharge section spiral conveyor being connected to a salt discharge port; An over-temperature protection device is provided on the bottom of the salt discharge, and the over-temperature protection device is connected to the cooling water system and the heat exchanger. The heat exchanger outlet is connected to an expansion tank, and the expansion tank is connected to the salt discharge port. The expansion tank is also connected to an external screw conveyor, and the heat exchanger is also connected to a condensate collection device.

[0009] Furthermore, the salt discharge section screw conveyor includes a conveying screw and a salt discharge section screw conveyor motor. The output end of the salt discharge section screw conveyor motor is connected to the conveying screw, and the conveying screw extends to the bottom of the salt discharge section.

[0010] Furthermore, the expander includes an inlet, a steam outlet and a salt discharge outlet; the expander inlet is connected to the salt discharge outlet and a fourth valve V004 is provided on the pipeline, the expander steam outlet is connected to the heat exchanger outlet and a second valve V002 is provided on the pipeline, and the expander salt discharge outlet is connected to the external screw conveyor and a third valve V003 is provided on the pipeline.

[0011] Furthermore, the over-temperature protection device is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet is connected to the cooling water system through a cooling water pipeline and a first valve V001 is provided on the pipeline; the cooling water outlet is connected to the heat exchanger.

[0012] Furthermore, a temperature detection instrument and a material level detection instrument are provided on the bottom of the salt discharge, and the material level detection instrument includes a high material level switch and a low material level switch; the material level difference signal LIC001 formed by the high material level switch and the low material level switch is interlocked with the fourth valve V004 and the forward and reverse rotation of the salt discharge section screw conveyor motor; the temperature detection instrument is the temperature detection instrument TIC001, and the temperature detection instrument TIC001 is interlocked with the cooling water system.

[0013] Furthermore, the over-temperature protection device is a spiral coil, a jacket or a membrane wall, and the over-temperature protection device is arranged on the inner side, the outer side or a mixed arrangement of the bottom of the salt discharge.

[0014] In a second aspect, the present invention provides a control method for an online desalination supercritical hydrothermal combustion type multi-element thermal fluid generating device, using the above-mentioned device, comprising the following steps: Control the reverse rotation of the spiral conveyor in the salt discharge section and monitor the changes in the material level difference at the bottom of the salt discharge. When the material level difference exceeds the set value, the spiral conveyor in the salt discharge section rotates forward to transport the salt slurry to the salt discharge port, and the salt discharge port transports the salt slurry to the expansion container; The liquid level changes of the salt slurry in the expansion vessel are monitored in real time. When the liquid level is higher than the set minimum level, the external screw conveyor is started to transport the salt slurry outward.

[0015] Furthermore, the material level difference signal LIC001 formed by the high material level switch and the low material level switch is monitored in real time. When the material level difference signal LIC001 is greater than a set value, the fourth valve V004 is opened.

[0016] Furthermore, a temperature detection instrument TIC001 is provided on the bottom of the salt discharge to monitor the temperature of the bottom of the salt discharge in real time. When the spiral conveyor of the salt discharge section transports salt slurry to the salt discharge port, the over-temperature protection device adjusts the first valve V001 to receive cooling water from the cooling water system and absorb the heat from the bottom of the salt discharge. The cooling water after absorbing the heat flows into the heat exchanger. The heat exchanger also receives steam from the expansion tank. The cooling water and steam after absorbing the heat enter the condensate collection device.

[0017] Furthermore, the liquid level in the expansion vessel is roughly adjusted by adjusting the rotational speed of the external screw conveyor motor, and the liquid level in the expansion vessel is finely adjusted by the third valve V003.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides an online desalination and discharge supercritical hydrothermal combustion type multi-element thermal fluid generating device. The frame-type agitator inside the bottom of the salt discharge can fully stir the salt-containing medium to prevent salt deposition and agglomeration, thereby ensuring the uniformity of the desalination process. The connection design between the salt discharge section screw conveyor and the salt discharge port can achieve efficient separation and continuous discharge of salt, avoiding the impact of salt accumulation on the equipment operation efficiency; the combination of the expansion tank and the external screw conveyor can further promote the crystallization and precipitation of dissolved salt, and transport it to the salt discharge port for a second time through the external screw conveyor, thereby improving the desalination efficiency and the thoroughness of salt discharge. The over-temperature protection device monitors the operating temperature of the equipment in real time. When the temperature exceeds the threshold, it immediately links the cooling water system to cool the equipment to prevent equipment damage or safety hazards caused by overheating, and ensure the stable operation of the device under high-temperature conditions such as supercritical hydrothermal combustion. The heat exchanger connected to the over-temperature protection device can transfer the heat of the high-temperature medium to the cooling water, realizing the recovery and utilization of heat energy and avoiding heat waste. At the same time, the condensed water at the heat exchanger outlet is recovered through the condensed water collection device and can be reused as circulating water, thereby improving the water resource utilization rate and energy-saving effect of the device.

[0019] Specifically, the interlocking design of the over-temperature protection equipment, temperature detection instrument TIC and cooling water system can quickly respond to temperature changes at the bottom of the salt discharge, adjust the cooling water volume in time, prevent the equipment from being damaged by high temperature, and extend the service life of the equipment.

[0020] Specifically, the heat exchanger effectively recovers heat, reusing the heat from the cooling water of the over-temperature protection device and the steam from the expansion tank, reducing system energy consumption. The condensate collection device recycles condensed water, enabling water recycling and reducing water waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an online desalination supercritical hydrothermal combustion type multi-element thermal fluid generating device in an embodiment of the present invention.

[0022] In the figure, 1. Frame agitator; 2. Over-temperature protection device; 3. Salt discharge bottom; 4. Salt discharge section screw conveyor; 5. Expansion tank; 6. External screw conveyor; 7. Heat exchanger; 8. Salt discharge section screw conveyor motor; 9. Condensate collection device; N1. Cooling water inlet; N2. Cooling water outlet; N3. Temperature detection instrument; N4. High material level switch; N5. Low material level switch; N6. Salt discharge port. DETAILED DESCRIPTION

[0023] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0026] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0029] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0032] Example 1 See Figure 1 The present invention provides an online desalination and supercritical hydrothermal combustion type multi-element thermal fluid generating device, comprising a desalination bottom 3, a frame stirrer 1 is provided inside the desalination bottom 3, the frame stirrer 1 promotes uniform mixing of the salt slurry by rotating and stirring, prevents salt from depositing and agglomerating, and creates good conditions for subsequent desalination operations; the desalination bottom 3 is connected to a salt discharge section spiral conveyor 4, the salt discharge section spiral conveyor 4 is connected to a salt discharge port N6, for conveying the salt slurry of the desalination bottom 3 to the salt discharge port N6; an over-temperature protection device 2 is provided on the desalination bottom 3, the over-temperature protection device 2 The cooling water system and the heat exchanger 7 are connected to absorb the heat from the bottom 3 of the salt discharge to prevent the equipment from being damaged by excessive temperature. The outlet of the heat exchanger 7 is connected to the expansion tank 5, which is connected to the salt discharge port N6 to receive the salt slurry and steam from the salt discharge port N6 and perform expansion and pressure reduction separation. The expansion tank 5 is also connected to an external screw conveyor 6 to transport the salt slurry separated by the expansion tank 5 to the outside of the system for collection or subsequent treatment. The heat exchanger 7 is also connected to a condensed water collection device 9 to collect the condensed water after heat exchange in the heat exchanger 7 to realize the recycling of water resources.

[0033] The main function of the frame agitator 1 is to continuously remove inorganic salts deposited on the wall and transport them to the spiral conveyor in the salt removal section. By creating a small gap with the inorganic salts and utilizing the porous medium properties naturally formed after the inorganic salts are deposited, the inorganic salts and fluid are depressurized and discharged online. This design effectively prevents the accumulation of inorganic salts at the bottom of the salt removal section, ensuring a smooth salt removal process.

[0034] The salt discharge section screw conveyor 4 includes a conveying screw and a salt discharge section screw conveyor motor 8. The output end of the salt discharge section screw conveyor motor 8 is connected to the conveying screw, which extends into the salt discharge bottom 3. The salt discharge section screw conveyor motor 8 provides power for the conveying screw. The forward and reverse rotation control of the salt discharge section screw conveyor motor 8 realizes the salt slurry conveying and anti-clogging functions, ensuring the stability and reliability of the salt discharge process. The expansion tank 5 includes an inlet, a steam outlet, and a salt discharge outlet. The inlet of the expansion tank 5 is connected to the salt discharge port N6, and a fourth valve V004 is provided on this pipeline to control the salt slurry flow from the salt discharge port N6 to the expansion tank 5. The steam outlet of the expansion tank 5 is connected to the outlet of the heat exchanger 7, and a second valve V002 is provided on this pipeline to control the steam outlet flow of the expansion tank 5 and regulate the pressure within the expansion tank 5. The salt discharge outlet of the expansion tank 5 is connected to the external screw conveyor 6, and a third valve V003 is provided on this pipeline to control the salt slurry flow at the salt discharge outlet of the expansion tank 5. The valves work together to ensure the stability of the expansion and salt discharge process.

[0035] The over-temperature protection device 2 is provided with a cooling water inlet N1 and a cooling water outlet N2. The cooling water inlet N1 is connected to the cooling water system through a cooling water pipeline and a first valve V001 is provided on the pipeline, which is used to control the amount of cooling water entering the over-temperature protection device 2 to achieve temperature regulation; the cooling water outlet N2 is connected to the heat exchanger 7, and the cooling water after absorbing heat is transported to the heat exchanger 7 for heat exchange.

[0036] The salt discharge bottom 3 is equipped with a temperature sensor N3 and a level sensor. The level sensor includes a high-level switch N4 and a low-level switch N5. The level difference signal LIC001 generated by the high-level switches N4 and N5 is interlocked with the fourth valve V004 and the forward and reverse rotation of the salt discharge screw conveyor motor 8, providing a basis for starting and stopping the salt discharge screw conveyor 4 and adjusting the opening of valve V004. The temperature sensor N3 is a temperature sensor TIC001, which is interlocked with the cooling water system to monitor the temperature of the salt discharge bottom 3 in real time and provide feedback for temperature control. When the temperature changes, the cooling water flow is controlled by adjusting the opening of the first valve V001 at the cooling water inlet N1, ensuring that the salt discharge bottom 3 operates within the appropriate temperature range and preventing damage to the equipment due to overheating. The over-temperature protection device 2 is a spiral coil, a jacket or a membrane wall. The over-temperature protection device 2 is arranged on the inner side, the outer side or a mixed arrangement of the salt discharge bottom 3. By cooperating with the cooling water system, it effectively absorbs the heat of the salt discharge bottom 3 and maintains the temperature within the range required for normal operation of the equipment, thereby playing an over-temperature protection role.

[0037] Example 2 The present invention provides a control method for an online desalination supercritical hydrothermal combustion type multi-element thermal fluid generating device, which uses the above-mentioned device; before the device is started, all control valves, the first valve V001, the second valve V002, the third valve V003, and the fourth valve V004 are in a closed state, wherein the first valve V001 is used to control the amount of cooling water entering the over-temperature protection device 2 to achieve temperature regulation; the second valve V002 is used to control the steam outlet flow of the expansion tank 5 to adjust the pressure in the expansion tank 5; the third valve V003 is used to control The salt slurry flow rate at the salt discharge outlet of the expansion vessel 5; the fourth valve V004 is used to control the salt slurry flow rate from the salt discharge port N5 to the expansion vessel 5; the salt discharge section screw conveyor 4, the external screw conveyor 6, and the salt discharge section screw conveyor motor 8 are all in the closed state. The salt discharge section screw conveyor 4 consists of a conveying screw and the salt discharge section screw conveyor motor 8. The salt discharge section screw conveyor motor 8 provides power for the conveying screw and is responsible for conveying the salt slurry from the salt discharge bottom 3 to the salt discharge port N5; the external screw conveyor 6 is used to convey the salt slurry separated by the expansion vessel 5 to the outside of the system. The back pressure valve is in the fully open state. The salt discharge bottom 3 serves as a collection and temporary storage area for the salt slurry. The frame agitator 1 installed inside it promotes uniform mixing of the salt slurry and prevents salt deposition and agglomeration.

[0038] After the device is started, the salt discharge section screw conveyor motor 8 of the salt discharge section screw conveyor 4 rotates in reverse, driving the conveying screw upward. At this time, the fourth valve V004 is closed. The salt discharge bottom 3 is equipped with a high-level switch N4 and a low-level switch N5. These switches generate a level difference signal LIC001. By real-time monitoring of the level difference signal LIC001, when LIC001 exceeds a set value, it indicates that the salt slurry in the salt discharge bottom 3 has accumulated to a certain level. At this time, valve V004 is opened, and the salt discharge section screw conveyor motor 8 rotates forward, causing the conveying screw to convey the salt slurry downward, and salt discharge begins through the salt discharge port N5 connected to the salt discharge section screw conveyor 4. During the salt discharge process, the opening of the fourth valve V004 is adjusted according to pressure changes to ensure that the salt discharge pressure is within the set range, avoiding pressure abnormalities that affect the salt discharge effect or damage the equipment. The over-temperature protection device 2 provided on the bottom 3 of the salt discharge is connected to the cooling water system and the heat exchanger 7. When the temperature of the bottom 3 of the salt discharge is abnormal, the opening of the first valve V001 is adjusted to control the amount of cooling water, and the bottom 3 of the salt discharge is cooled to ensure safe operation of the equipment.

[0039] The expansion tank 5 has an inlet, a steam outlet and a salt discharge outlet. The inlet is connected to the salt discharge port N5 via a pipeline provided with a fourth valve V004, the steam outlet is connected to the outlet of the heat exchanger 7 via a pipeline provided with a second valve V002, and the salt discharge outlet is connected to the external screw conveyor 6 via a pipeline provided with a third valve V003. The liquid level of the expansion tank 5 is monitored in real time. When the liquid level of the expansion tank 5 is greater than the set minimum liquid level, it indicates that sufficient salt slurry or fluid has accumulated in the expansion tank 5. At this time, the external screw conveyor 6 and the third valve V003 are opened, and the external screw conveyor 6 conveys the salt slurry outward. At the same time, the liquid level in the expansion tank 5 is roughly adjusted by using the speed of the motor of the external screw conveyor 6, and the liquid level in the expansion tank 5 is finely adjusted through the third valve V003; when the liquid level in the expansion tank 5 is greater than the lower limit of the set liquid level range, the speed of the motor of the external screw conveyor 6 is reduced, the opening of the third valve V003 is reduced, the amount of salt discharged is reduced, and the liquid level is raised; when the liquid level in the expansion tank 5 is greater than the upper limit of the set liquid level range, the speed of the motor of the external screw conveyor 6 is increased, the opening of the third valve V003 is increased, the salt discharge speed is accelerated, and the liquid level in the expansion tank 5 is lowered.

[0040] A temperature detection instrument TIC001 is provided on the bottom 3 of the salt discharge to monitor the temperature of the bottom 3 of the salt discharge in real time. When the spiral conveyor 4 of the salt discharge section transports salt slurry to the salt discharge port N6, the over-temperature protection device 2 adjusts the first valve V001 to receive cooling water from the cooling water system and absorb the heat from the bottom 3 of the salt discharge. The cooling water after absorbing the heat flows into the heat exchanger 7. The heat exchanger 7 also receives steam from the expansion tank 5. The cooling water and steam after absorbing the heat enter the condensate collection device 9.

[0041] Heat exchanger 7 receives cooling water from over-temperature protection device 2 and steam from the steam outlet of expansion tank 5, exchanging heat. The condensed water from the exchange flows through a pipeline into condensate collection device 9, which collects the condensed water produced by heat exchanger 7. This allows for water recycling, reduces system water consumption, and improves water resource utilization.

[0042] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An online desalination supercritical water thermal combustion type multi-element thermal fluid generating device, characterized in that: It comprises a salt discharge bottom (3), a frame-type agitator (1) is provided inside the salt discharge bottom (3), the salt discharge bottom (3) is connected to a salt discharge section screw conveyor (4), and the salt discharge section screw conveyor (4) is connected to a salt discharge port (N6); An over-temperature protection device (2) is provided on the bottom (3) of the salt discharge, and the over-temperature protection device (2) is connected to the cooling water system and the heat exchanger (7). The outlet of the heat exchanger (7) is connected to the expansion tank (5), and the expansion tank (5) is connected to the salt discharge port (N6). The expansion tank (5) is also connected to an external screw conveyor (6), and the heat exchanger (7) is also connected to a condensed water collection device (9).

2. The online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 1 is characterized in that: The salt discharge section screw conveyor (4) comprises a conveying screw and a salt discharge section screw conveyor motor (8), wherein the output end of the salt discharge section screw conveyor motor (8) is connected to the conveying screw, and the conveying screw extends into the salt discharge bottom (3).

3. The online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 2, characterized in that: The expansion tank (5) includes an inlet, a steam outlet, and a salt discharge outlet; the inlet of the expansion tank (5) is connected to the salt discharge outlet (N6) and a fourth valve V004 is provided on the pipeline; the steam outlet of the expansion tank (5) is connected to the outlet of the heat exchanger (7) and a second valve V002 is provided on the pipeline; the salt discharge outlet of the expansion tank (5) is connected to the external screw conveyor (6) and a third valve V003 is provided on the pipeline.

4. The online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 3 is characterized in that: The over-temperature protection device (2) is provided with a cooling water inlet (N1) and a cooling water outlet (N2); the cooling water inlet (N1) is connected to the cooling water system via a cooling water pipeline and a first valve V001 is provided on the pipeline; the cooling water outlet (N2) is connected to the heat exchanger (7).

5. The online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 4, characterized in that: A temperature detection instrument (N3) and a material level detection instrument are provided on the bottom (3) of the salt discharge section. The material level detection instrument includes a high material level switch (N4) and a low material level switch (N5). The material level difference signal LIC001 formed by the high material level switch (N4) and the low material level switch (N5) is interlocked with the forward and reverse rotation of the fourth valve V004 and the salt discharge section screw conveyor motor (8). The temperature detection instrument (N3) is a temperature detection instrument TIC001, and the temperature detection instrument TIC001 is interlocked with the cooling water system.

6. The online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 5, characterized in that: The over-temperature protection device (2) is a spiral coil, a jacket, or a membrane wall, and the over-temperature protection device (2) is arranged on the inner side, the outer side, or a mixed arrangement of the salt discharge bottom (3).

7. A control method for an online desalination supercritical hydrothermal combustion type multi-element thermal fluid generating device, using the device according to any one of claims 1 to 6, characterized in that: The following steps are involved: The salt discharge section screw conveyor (4) is controlled to reverse, and the change of the material level difference at the salt discharge bottom (3) is monitored. When the material level difference exceeds the set value, the salt discharge section screw conveyor (4) is rotated forward to convey the salt slurry to the salt discharge port (N6), and the salt discharge port (N6) conveys the salt slurry to the expansion container (5); The liquid level change of the salt slurry in the expansion vessel (5) is monitored in real time. When the liquid level is higher than the set minimum liquid level, the external screw conveyor (6) is started to convey the salt slurry outward.

8. The control method of an online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 7, characterized in that: The material level difference signal LIC001 formed by the high material level switch (N4) and the low material level switch (N5) is monitored in real time. When the material level difference signal LIC001 is greater than the set value, the fourth valve V004 is opened.

9. The control method of the online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 7, characterized in that: A temperature detection instrument TIC001 is provided on the bottom of the salt discharge (3) to monitor the temperature of the bottom of the salt discharge (3) in real time. When the salt discharge section screw conveyor (4) conveys salt slurry to the salt discharge port (N6), the over-temperature protection device (2) adjusts the first valve V001 to receive cooling water from the cooling water system, absorbs heat from the bottom of the salt discharge (3), and the cooling water after absorbing heat flows into the heat exchanger (7). The heat exchanger (7) also receives steam from the expansion tank (5), and the cooling water and steam after absorbing heat enter the condensate collection device (9).

10. The control method of an online desalination supercritical water thermal combustion type multi-element thermal fluid generating device according to claim 7, characterized in that: The liquid level of the expansion container (5) is roughly adjusted by adjusting the motor speed of the external screw conveyor (4), and the liquid level of the expansion container (5) is finely adjusted through the third valve V003.

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