A reactor temperature control system for a supercritical water oxidation apparatus

Abstract

The application is a temperature control system of supercritical water oxidation reactor, characterized in that it comprises a feed pump (1), a first preheater (2), a second preheater (3), a reactor (4), a first cooling water pump (6), a second cooling water pump (7), a water outlet heat exchanger (5), an oxygen pump (8) and a temperature controller TKIC; the feed pump (1), the first preheater (2), the second preheater (3), the reactor (4) and the water outlet heat exchanger (5) are sequentially connected together; organic wastewater flows out of the system through the first preheater (2), the second preheater (3), the reactor (4) and the water outlet heat exchanger (5) in sequence under the action of the feed pump (1); the application controls and adjusts the control equipment according to a preset algorithm by calculating the temperature difference, the temperature change rate and the direction, so as to realize the automatic control of the reactor temperature.

Description

Technical Field

[0001] This invention belongs to the fields of chemical and environmental protection technology, and relates to a reactor temperature control system for a supercritical water oxidation device. Background Technology

[0002] With advancements in science and technology and industry, the quantity and types of organic wastewater generated by enterprises are constantly increasing, leading to a continuous emergence of environmental problems. Supercritical water oxidation technology utilizes the characteristics of supercritical water to fully dissolve and react organic waste with oxidants, making it a new technology and direction for the efficient treatment of organic wastewater that is difficult to treat using conventional methods, with very high treatment efficiency.

[0003] Supercritical water oxidation is an exothermic reaction. When the feed concentration reaches a certain range, the temperature inside the reactor can be maintained. However, during long-term operation of the equipment, due to emulsification effect, uneven material distribution, and other reasons, the internal temperature of the reactor may fluctuate greatly or even become uncontrollable. Summary of the Invention

[0004] The purpose of this invention is to provide a reactor temperature control system for supercritical water oxidation devices. This invention predicts the rate and trend of temperature change in advance and reacts accordingly, so as to control the temperature fluctuation range of the reactor within a long-term stable range.

[0005] A temperature control system for a supercritical water oxidation reactor is characterized by comprising a feed pump 1, a first preheater 2, a second preheater 3, a reactor 4, a first cooling water pump 6, a second cooling water pump 7, an outlet water heat exchanger 5, an oxygen pump 8, and a temperature controller TKIC. The feed pump 1, first preheater 2, second preheater 3, reactor 4, and outlet water heat exchanger 5 are connected sequentially. Organic wastewater flows out of the system sequentially through the first preheater 2, second preheater 3, reactor 4, and outlet water heat exchanger 5 via the feed pump 1. Oxygen is injected into reactor 4 from the top via oxygen pump 8 to react with the supercritical wastewater inside reactor 4. The first cooling water pump 6 injects cooling water into the bottom of reactor 4 through an inlet located below reactor 4. The second cooling water pump injects cooling water into the bottom of the second preheater 3 through an inlet located below the second preheater 3.

[0006] The first preheater 2, the second preheater 3, and the reactor 4 are all equipped with electric heaters. Through three-stage heating, the organic wastewater in the reactor 4 reaches a supercritical state. The temperature controller TKIC collects the actual operating temperature TE inside the reactor and the reactor outlet temperature TE1 through temperature sensors, and controls the relevant devices to adjust the temperature inside the reactor 4.

[0007] The feed pump 1, the first cooling water pump 2, the second cooling water pump 3, and the oxygen pump 8 are all frequency converter controlled, and the feed rate, water rate, and air rate can be continuously adjusted within the range.

[0008] The reactor 4 is equipped with a reactor sleeve inside, and the reactor 4 is of the top-inlet and top-outlet type. The reactor sleeve can separate the high-temperature part of the reaction zone inside the reactor from the inner wall of the reactor. Especially when the temperature inside the reactor is too high, the temperature of the inner wall of the reactor can be reduced by bottom cooling water, so as to prevent the material of the reactor 4 from entering the range of rapid strength reduction.

[0009] The reactor is set with a set temperature T, a set temperature fluctuation range ΔT, a set primary temperature limit T1, a set secondary temperature limit T2, and a set tertiary temperature limit T3. The temperature gradient is: T - ΔT ≤ T + ΔT ≤ T1 ≤ T2 ≤ T3, where TE is the actual operating temperature inside the reactor. The temperature controller TKIC calculates the temperature difference between the actual operating temperature TE and the set temperature T. The actual operating temperature inside the reactor is adjusted by regulating the power of the electric heater 9 and the start / stop of the electric heater 9 to compensate for the temperature fluctuation, or by adjusting the feed rate, air rate, and two-stage cooling water rate of the reactor 4.

[0010] When all parameters are stable during normal operation and the actual operating temperature TE inside the reactor is maintained within the range of T±ΔT, the temperature controller TKIC compensates for the fluctuations in reactor temperature by adjusting the power of electric heater 9 and starting and stopping electric heater 9.

[0011] When the actual operating temperature TE of the reactor is within the range of T-ΔT≤TE≤T, the heating rate of the electric heater 9 cannot compensate for the temperature drop trend in the short term. The temperature controller TKIC calculates the difference and the rate of temperature drop or rise to determine the required feed rate of the feed pump 1, and controls and adjusts the frequency of the feed pump 1 in real time to achieve the calculated feed rate. When the temperature is on a downward trend, the temperature controller TKIC increases the feed rate of the feed pump 1. When the temperature is on a rising trend, the temperature controller TKIC slowly decreases the feed rate of the feed pump 1. When the temperature controller TKIC adjusts the feed rate of the feed pump 1, it correspondingly adjusts the air intake of the oxygen pump 8 to maintain the oxygen and feed rates proportionally.

[0012] When the actual operating temperature is set to T1 ≤ TE ≤ T2, the temperature controller TKIC stops the electric heater 9 and fixes the motor frequency of the feed pump 1 at the lowest set value without further adjustment. The temperature controller TKIC calculates the required water flow rate for the second cooling water pump 7 based on the temperature difference and the rate of temperature rise or fall. It then starts the second cooling water pump 7 and adjusts its frequency in real time to bring the water flow rate close to the calculated result. When the temperature is decreasing, the temperature controller TKIC slowly reduces the water flow rate of the second cooling water pump 7; when the temperature is rising, the temperature controller TKIC accelerates the increase of the water flow rate of the second cooling water pump 7. The greater the temperature difference and the faster the rate of temperature change, the faster the water flow rate adjustment, and vice versa. When the internal temperature TE of the reactor is lower than T1, the second cooling water pump 7 is stopped.

[0013] When the actual operating temperature is set to T2 ≤ TE ≤ T3, the temperature controller TKIC stops the electric heater 9, fixes the motor frequency of the feed pump 1 at the lowest set value, and adjusts the motor frequency of the second cooling water pump 7 to the maximum without further adjustment. The temperature controller TKIC calculates the required water intake of the first cooling water pump 6 based on the difference in temperature and the rate of temperature rise or fall, starts the first cooling water pump 6, and controls and adjusts the frequency of the first cooling water pump 6 in real time to make the water intake close to the calculated result. When the temperature is on a downward trend, the temperature controller TKIC slowly reduces the water intake of the first cooling water pump 6. When the temperature is on a rising trend, the temperature controller TKIC accelerates the increase of the water intake of the first cooling water pump 6. The larger the temperature difference and the faster the rate of temperature change, the faster the water intake adjustment, and vice versa. When the internal temperature TE of the reactor is lower than T2, the first cooling water pump 6 is stopped.

[0014] 8. A temperature control system for a supercritical water oxidation reactor according to claim 1 or 2, characterized in that the reactor outlet temperature TE1 is controlled, and when the reactor outlet temperature TE1 exceeds the set value, the electric heater 9, the feed pump 1 and the oxygen pump 8 are stopped, and the water inlet flow of the first cooling water pump 6 and the second cooling water pump 7 are both adjusted to the maximum value.

[0015] Compared with the closest existing technology, the technical solution provided by the present invention has the following superior effects:

[0016] 1. Advance prediction and control. Based on conventional on / off control, the calculation of temperature deviation magnitude and rate of change is added to analyze temperature change trends and make corresponding adjustments to compensate for temperature changes in advance.

[0017] 2. Multi-level temperature gradient response. Different temperature gradients are set according to the actual operating temperature inside the reactor, and different equipment is activated for adjustment. The adjusted equipment is flexible and has a fast response speed.

[0018] 3. Facilitates automatic adjustment. The temperature acquisition controller collects the internal temperature of the reactor in real time, calculates the temperature difference, rate and direction of temperature change, and adjusts the corresponding control equipment according to a preset algorithm to achieve automated control of the reactor temperature. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0020] Figure 1 This invention provides a temperature control system for a supercritical water oxidation reactor.

[0021] In the diagram: 1. Feed pump, 2. First preheater, 3. Second preheater, 4. Reactor, 5. Outlet water heat exchanger, 6. First cooling water pump, 7. Second cooling water pump, 8. Oxygen pump, 9. Electric heater, TE is the internal temperature of the reactor, TE1 is the outlet temperature of the reactor, and TKIC is the internal temperature acquisition controller of the reactor.

[0022] In the diagram: 1 is the feed pump, 2 is the first preheater, 3 is the second preheater, 4 is the reactor, 5 is the outlet water heat exchanger, 6 is the first cooling water pump, 7 is the second cooling water pump, 8 is the oxygen pump, 9 is the electric heater, TE is the internal temperature of the reactor, TE1 is the outlet temperature of the reactor, and TKIC is the temperature controller. Detailed Implementation

[0023] To achieve the above objectives, the present invention provides the following solution:

[0024] This invention primarily addresses the issue of unstable, even uncontrollable, internal temperature within the reactor during the operation of supercritical water oxidation equipment, providing a reactor temperature control system for such equipment. The invention comprises a feed pump, a first preheater, a second preheater, a reactor, a first cooling water pump, a second cooling water pump, an outlet water heat exchanger, an oxygen pump, and a temperature controller. The feed pump, first cooling water pump, second cooling water pump, and oxygen pump are all frequency converters, allowing continuous adjustment of the feed rate, water rate, and air rate within their respective ranges. The reactor heater has both start-up control and continuous adjustment functions, which can be used in combination.

[0025] Organic wastewater, fed by a feed pump, flows sequentially through a first preheater, a second preheater, a reactor, and an effluent heat exchanger before exiting the system. The first preheater, second preheater, and reactor are all equipped with electric heaters, achieving a supercritical state for the organic wastewater through three-stage heating. Oxygen is injected into the reactor from the top via an oxygen pump, reacting with the supercritical wastewater. The reactor is equipped with a reaction sleeve and is a top-in, top-out reactor. The sleeve isolates the high-temperature portion of the reaction zone from the reactor wall, especially crucial for reducing internal temperature through bottom cooling water intake, preventing the reactor material from entering a weakening zone. Cooling water inlets are located at the bottom of the second preheater and the reactor. When the internal or outlet temperature exceeds a set value, the feed (water, air) rate of relevant equipment is activated or adjusted to reduce internal temperature fluctuations.

[0026] This invention establishes different temperature gradients for the reactor and adopts corresponding control functions and temperature control targets for different temperature gradients, reducing the frequency and range of temperature fluctuations inside the reactor and ensuring long-term stable operation of the supercritical water oxidation device. This invention fully considers the temperature difference between the set temperature and the operating temperature, the rate and direction of temperature change in the operating temperature, and the influence of control equipment on temperature changes. Corresponding control functions are established for different temperature gradients, and the input values ​​of the control functions are the reactor temperature difference and the rate of temperature change, i.e., VFD (Vehicle Temperature Difference). n =f n (ΔT, dT / dt), where VFD n ΔT represents the real-time operating frequency of different equipment, ΔT represents the difference between the actual operating temperature inside the reactor and the set temperature, dT / dt represents the rate of temperature change inside the reactor, and n represents the number of controllable equipment (feed pump, cooling water pump, oxygen pump, electric heater, etc.).

[0027] Example:

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0029] In the description of this invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a flange connection; they can refer to a threaded connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0030] 1. The temperature gradient is: T-ΔT≤T+ΔT≤T1≤T2≤T3, where T is the set temperature of the reactor, ΔT is the set temperature fluctuation range, and TE is the actual operating temperature inside the reactor.

[0031] 2. During normal operation, all parameters are stable and the internal temperature TE of the reactor is maintained within the range of T±ΔT. The controller TKIC compensates for the fluctuation of the reactor temperature by adjusting the power of the electric heater 9 and starting and stopping the electric heater 9.

[0032] 3. When the actual operating temperature T - ΔT ≤ TE ≤ T, the heating rate of electric heater 9 cannot compensate for the temperature drop trend in the short term. The controller TKIC calculates the difference and the rate of temperature drop (or rise) to determine the required feed rate of feed pump 1, and controls and adjusts the frequency of feed pump 1 in real time to achieve the calculated feed rate. When the temperature is on a downward trend, the TKIC controller increases the feed rate of feed pump 1; when the temperature is on a rising trend, the TKIC controller slowly decreases the feed rate of feed pump 1. When the TKIC controller adjusts the feed rate of feed pump 1, it correspondingly adjusts the air intake of oxygen pump 8 to maintain a proportional adjustment between oxygen and feed rate.

[0033] 4. When the actual operating temperature T + ΔT ≤ TE ≤ T1, the TKIC controller stops the electric heater 9. The TKIC controller calculates the required feed rate of the feed pump 1 based on the temperature difference and the rate of temperature decrease (or increase), and controls and adjusts the frequency of the feed pump 1 in real time to bring the feed rate close to the calculated result. When the temperature is decreasing, the TKIC controller slowly reduces the feed rate of the feed pump 1; when the temperature is increasing, the TKIC controller accelerates the reduction of the feed rate of the feed pump 1, but the motor frequency of the feed pump 1 cannot be lower than the minimum set value. The larger the temperature difference and the faster the rate of temperature change, the faster the feed rate adjustment, and vice versa. When the TKIC controller adjusts the feed rate of the feed pump 1, it correspondingly adjusts the air intake of the oxygen pump 8 to maintain a proportional adjustment between oxygen and feed rate.

[0034] 5. When the actual operating temperature is set at T1 ≤ TE ≤ T2, the controller TKIC stops the electric heater 9 and fixes the motor frequency of the feed pump 1 at the lowest set value without further adjustment. The controller TKIC calculates the required water flow rate for the second cooling water pump 7 based on the temperature difference and the rate of temperature increase (or decrease). It then starts the second cooling water pump 7 and adjusts its frequency in real time to bring the water flow rate closer to the calculated result. When the temperature is decreasing, the controller TKIC slowly reduces the water flow rate of the second cooling water pump 7; when the temperature is increasing, the controller TKIC accelerates the increase of the water flow rate of the second cooling water pump 7. The larger the temperature difference and the faster the rate of temperature change, the faster the water flow rate adjustment, and vice versa. When the internal temperature TE of the reactor is lower than T1, the second cooling water pump 7 is stopped.

[0035] 6. When the actual operating temperature is set to T2 ≤ TE ≤ T3, the controller TKIC stops the electric heater 9, fixes the motor frequency of the feed pump 1 at the lowest set value, and adjusts the motor frequency of the second cooling water pump 7 to the maximum, without further adjustment. The controller TKIC calculates the required water intake for the first cooling water pump 6 based on the temperature difference and the rate of temperature increase (or decrease), starts the first cooling water pump 6, and controls and adjusts its frequency in real time to bring the water intake close to the calculated result. When the temperature is decreasing, the controller TKIC slowly reduces the water intake of the first cooling water pump 6; when the temperature is increasing, the controller TKIC accelerates the increase of the water intake of the first cooling water pump 6. The larger the temperature difference and the faster the rate of temperature change, the faster the water intake adjustment, and vice versa. When the internal temperature TE of the reactor is lower than T2, the first cooling water pump 6 is stopped.

[0036] 7. In the entire control system, the reactor outlet temperature TE1 is different from the reactor internal temperature TE, which is the system protection temperature and has the highest control priority. When the reactor outlet temperature TE1 exceeds the set value, regardless of which temperature gradient range TE is in, the electric heater 9, feed pump 1 and oxygen pump 8 are stopped, and the water inlet of the first cooling water pump 6 and the second cooling water pump 7 are adjusted to the maximum value.

[0037] This control system is simple, ingenious, highly practical, easy to operate, and widely applicable.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0039] A temperature control system for a supercritical water oxidation reactor, characterized in that it comprises a feed pump, a first preheater, a second preheater, a reactor, a first cooling water pump, a second cooling water pump, an outlet water heat exchanger, an oxygen pump, and a temperature controller.

[0040] The feed pump, the first cooling water pump, the second cooling water pump, and the oxygen pump are all frequency converter controlled, and the feed rate, water rate, and air rate can be continuously adjusted within the range.

[0041] The feed rate, water rate, and air rate can be continuously adjusted within their respective ranges.

[0042] The reactor heater has both start-up control and continuous adjustment functions, which can be used in combination.

[0043] Organic wastewater, fed by a feed pump, flows sequentially through a first preheater, a second preheater, a reactor, and an effluent heat exchanger before exiting the system. The first preheater, second preheater, and reactor are all equipped with electric heaters, achieving a supercritical state for the organic wastewater in the reactor through three-stage heating. Oxygen is injected into the reactor from the top via an oxygen pump, reacting with the supercritical wastewater within the reactor.

[0044] The reactor is equipped with a reaction sleeve inside, and the reactor is a top-in, top-out type. The sleeve can separate the high-temperature part of the reaction zone inside the reactor from the inner wall of the reactor. Especially when the temperature inside the reactor is too high, the temperature of the inner wall of the reactor can be reduced by bottom cooling water, thus preventing the reactor material from entering the range of rapid strength weakening.

[0045] The second preheater and the bottom of the reactor are equipped with cooling water inlets. When the internal temperature of the reactor or the outlet temperature of the reactor exceeds the corresponding set value, the feed (water, gas) of the relevant equipment is started, stopped or adjusted to reduce the temperature fluctuation range inside the reactor.

[0046] This invention provides a reactor temperature control system for a supercritical water oxidation unit, comprising a feed pump, a first preheater, a second preheater, a reactor, a first cooling water pump, a second cooling water pump, an outlet water heat exchanger, an oxygen pump, and a temperature controller. The feed pump, first cooling water pump, second cooling water pump, and oxygen pump are all frequency converters, allowing continuous adjustment of the feed rate, water rate, and air rate within their respective ranges. The reactor heater has both start-up control and continuous adjustment functions, which can be used in combination.

Claims

1. A temperature control system for a supercritical water oxidation reactor, characterized in that, The system includes a feed pump (1), a first preheater (2), a second preheater (3), a reactor (4), a first cooling water pump (6), a second cooling water pump (7), an outlet water heat exchanger (5), an oxygen pump (8), and a temperature controller TKIC. The feed pump (1), the first preheater (2), the second preheater (3), the reactor (4), and the outlet water heat exchanger (5) are connected together in sequence. Organic wastewater flows out of the system through the first preheater (2), the second preheater (3), the reactor (4), and the outlet water heat exchanger (5) in sequence after being fed by the feed pump (1). Oxygen is injected into the reactor (4) from the top of the reactor (4) through the oxygen pump (8) and reacts with the supercritical wastewater in the reactor (4). The first cooling water pump (6) injects cooling water into the bottom of the reactor (4) through the inlet set below the reactor (4). The second cooling water pump (7) injects cooling water into the bottom of the second preheater (3) through the inlet below the second preheater (3). The first preheater (2), the second preheater (3), and the reactor (4) are all equipped with electric heaters. Through three-stage heating, the organic wastewater in the reactor (4) reaches a supercritical state. The temperature controller TKIC collects the actual operating temperature TE inside the reactor and the outlet temperature TE1 of the reactor (4) through the temperature sensor and adjusts the temperature inside the reactor (4). The feed pump (1), the first cooling water pump (6), the second cooling water pump (7) and the oxygen pump (8) are all frequency converters, and the feed rate, water rate and air rate can be continuously adjusted within the range.

2. The temperature control system for a supercritical water oxidation reactor according to claim 1, characterized in that, The reactor (4) is equipped with a reactor sleeve inside, and the reactor (4) is of the top-inlet and top-outlet type. The reactor sleeve can separate the high-temperature part of the reaction zone inside the reactor (4) from the inner wall of the reactor. When the internal temperature of the reactor (4) exceeds the limit, the temperature of the inner wall of the reactor (4) is reduced by bottom cooling water, so as to prevent the material of the reactor (4) from entering the range of rapid strength reduction.

3. The temperature control system for a supercritical water oxidation reactor according to claim 1 or 2, characterized in that, The reactor is set to a temperature T, a temperature fluctuation range ∆T, a first-level temperature limit T1, a second-level temperature limit T2, and a third-level temperature limit T3. The temperature gradient is: T-∆T≤T+∆T≤T1≤T2≤T3, where TE is the actual operating temperature inside the reactor. The temperature controller TKIC calculates the temperature difference between the actual operating temperature TE inside the reactor and the set temperature T of the reactor. The actual operating temperature TE inside the reactor is adjusted by adjusting the power of the electric heater (9) of the reactor and starting and stopping the electric heater (9) of the reactor to compensate for the temperature fluctuation of the reactor (4), or by adjusting the feed rate, air rate and two-stage cooling water rate of the reactor (4).

4. The temperature control system for a supercritical water oxidation reactor according to claim 3, characterized in that, When all parameters are stable during normal operation and the actual operating temperature TE inside the reactor is maintained within the range of T±∆T, the temperature controller TKIC compensates for the temperature fluctuation of the reactor (4) by adjusting the power of the electric heater (9) of the reactor and starting and stopping the electric heater (9) of the reactor.

5. The temperature control system for a supercritical water oxidation reactor according to claim 3, characterized in that, When the actual operating temperature TE inside the reactor is within the range of T-∆T≤TE≤T, the heating rate of the electric heater (9) of the reactor cannot compensate for the temperature drop trend in a short time. The temperature controller TKIC calculates the difference and the rate of temperature drop or rise to calculate the feed amount required by the feed pump (1), and controls and adjusts the frequency of the feed pump (1) in real time to make the feed amount reach the calculated result. When the temperature is decreasing, the temperature controller TKIC increases the feed rate of the feed pump (1); when the temperature is increasing, the temperature controller TKIC slowly decreases the feed rate of the feed pump (1); when the temperature controller TKIC adjusts the feed rate of the feed pump (1), the oxygen pump (8) is adjusted accordingly to keep the oxygen and feed rate adjusted proportionally.

6. The temperature control system for a supercritical water oxidation reactor according to claim 3, characterized in that, When the actual operating temperature TE inside the reactor is within the range of T1≤TE≤T2, the temperature controller TKIC stops the electric heater (9) of the reactor and fixes the motor frequency of the feed pump (1) at the lowest set value and no longer adjusts it; the temperature controller TKIC calculates the difference and the rate of temperature rise or fall to calculate the required water volume of the second cooling water pump (7), starts the second cooling water pump (7) and controls and adjusts the frequency of the second cooling water pump (7) in real time to make the water volume approach the calculated result; when the temperature is in a downward trend, the temperature controller TKIC slowly reduces the water volume of the second cooling water pump (7); when the temperature is in a rising trend, the temperature controller TKIC accelerates the increase of the water volume of the second cooling water pump (7); the greater the temperature difference, the faster the rate of temperature change, and the faster the water volume adjustment, and vice versa; when the actual operating temperature TE inside the reactor is lower than T1, the second cooling water pump (7) is stopped.

7. The temperature control system for a supercritical water oxidation reactor according to claim 3, characterized in that, When the actual operating temperature TE inside the reactor is within the range of T2≤TE≤T3, the temperature controller TKIC stops the electric heater (9) of the reactor and fixes the motor frequency of the feed pump (1) at the lowest set value and adjusts the motor frequency of the second cooling water pump (7) to the maximum and no longer adjusts it; the temperature controller TKIC calculates the difference and the rate of temperature rise or fall to calculate the required water intake of the first cooling water pump (6), starts the first cooling water pump (6) and controls and adjusts the frequency of the first cooling water pump (6) in real time to make the water intake close to the calculated result; when the temperature is in a downward trend, the temperature controller TKIC slowly reduces the water intake of the first cooling water pump (6); when the temperature is in a rising trend, the temperature controller TKIC accelerates the increase of the water intake of the first cooling water pump (6); the larger the temperature difference, the faster the rate of temperature change, and the faster the water intake adjustment, and vice versa; when the actual operating temperature TE inside the reactor is lower than T2, the first cooling water pump (6) is stopped.

8. A temperature control system for a supercritical water oxidation reactor according to claim 1 or 2, characterized in that, The reactor outlet temperature TE1 is controlled. When the reactor outlet temperature TE1 exceeds the set value, the reactor electric heater (9), feed pump (1) and oxygen pump (8) are stopped, and the water inlet of the first cooling water pump (6) and the second cooling water pump (7) are adjusted to the maximum value.

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