A supercritical water oxidation system

Abstract

The invention provides a supercritical water oxidation system, which belongs to the technical field of organic waste treatment equipment, and comprises a reaction device, an oxygen conveying device and a material conveying device, wherein the oxygen conveying device comprises an oxygen pipeline and a high-pressure oxygen pump; the two ends of the oxygen pipeline are respectively connected with the reaction device and the high-pressure oxygen pump; the material conveying device comprises a high-pressure material pump and a material pipeline, and the two ends of the material pipeline are respectively connected with the reaction device and the high-pressure material pump; the material pipeline is provided with a first flow meter and a first regulating valve; the oxygen pipeline is provided with a second flow meter and a second regulating valve; the application can adjust the flow of the oxygen pipeline in real time according to the material flow rate and the oxygen content of oxygen in the tail gas after the reaction, thereby realizing automatic adjustment of the oxygen flow rate according to the change of the material flow rate, and can reduce the situation of over-oxygen or under-oxygen in the reaction device, so as to reduce the potential safety hazards.

Description

Technical Field

[0001] The invention belongs to the technical field of organic waste treatment equipment, and in particular relates to a supercritical water oxidation system. Background Art

[0002] Supercritical water oxidation technology is a new type of oxidation technology that can completely destroy the structure of organic matter and can be used to treat liquid, semi-solid, solid and other organic wastes.

[0003] The traditional supercritical water oxidation pipeline system monitors and regulates the oxygen flow in the pipeline through a flow meter and a pneumatic control valve. When using the traditional supercritical water oxidation pipeline system, the operator needs to set a given value for the oxygen flow rate. The above given value is usually determined by the operator based on experience and then manually input. Therefore, the above oxygen flow control process is prone to over-oxygenation or under-oxygenation in the pipeline system; when the pipeline system is over-oxygenated, there will be a risk of deflagration during the reaction process, posing a safety hazard; when the pipeline system is under-oxygenated, the amount of oxygen cannot meet the needs of the material oxidation reaction, the reaction is incomplete, and the product after the reaction does not meet the standard. Summary of the invention

[0004] The embodiment of the present invention provides a supercritical water oxidation system, which aims to solve the technical problem that a traditional supercritical water oxidation piping system is prone to over-oxygenation or under-oxygenation of the reaction system during use, thereby posing a safety hazard.

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

[0006] A supercritical water oxidation system is provided, comprising a reaction device, an oxygen delivery device and a material delivery device, wherein the oxygen delivery device comprises an oxygen pipeline and a high-pressure oxygen pump; two ends of the oxygen pipeline are respectively connected to the reaction device and the high-pressure oxygen pump;

[0007] The material conveying device comprises a high-pressure material pump and a material pipeline, and both ends of the material pipeline are respectively connected to the reaction device and the high-pressure material pump;

[0008] The material pipeline is provided with a first flow meter and a first regulating valve; the oxygen pipeline is provided with a second flow meter and a second regulating valve;

[0009] The supercritical water oxidation system also includes:

[0010] a first controller, electrically connected to the first flow meter and the first regulating valve, respectively; the first controller is used to compare the detection value of the first flow meter with a preset value; when the detection value is greater than the preset value, the control signal output by the first controller decreases, so that the opening of the first regulating valve decreases to reduce the material flow; when the detection value is less than the preset value, the control signal output by the first controller increases, so that the opening of the first regulating valve increases to increase the material flow;

[0011] a proportional controller, electrically connected to the first flow meter and the first controller respectively; the proportional controller is used to receive the detection value of the first flow meter and output an oxygen demand value corresponding to the detection value of the first flow meter;

[0012] The second controller is electrically connected to the second flow meter, the second regulating valve and the proportional controller respectively; the second controller is used to receive the oxygen demand value and the detection value of the second flow meter; when the detection value of the second flow meter is greater than the oxygen demand value, the control signal output by the second controller decreases, so that the opening of the second regulating valve decreases to reduce the oxygen flow rate; when the detection value of the second flow meter is less than the oxygen demand value, the control signal output by the second controller increases, so that the opening of the second regulating valve increases to increase the oxygen flow rate.

[0013] In a possible implementation, the oxygen pipeline is connected to an oxygen buffer tank, and the oxygen buffer tank is located between the high-pressure oxygen pump and the second flow meter.

[0014] In a possible implementation, the supercritical water oxidation system further includes:

[0015] An oxygen concentration detector is provided on the outlet pipe of the reaction device and is used to detect the oxygen concentration after the reaction in the reaction device; the oxygen concentration detector is electrically connected to the proportional controller;

[0016] Wherein, when the detection value of the oxygen concentration detector is greater than a preset value, the oxygen demand value output by the proportional controller decreases; when the detection value of the oxygen concentration detector is less than the preset value, the oxygen demand value output by the proportional controller increases.

[0017] In a possible implementation, the supercritical water oxidation system further includes a fourth controller, and the oxygen concentration detector is electrically connected to the proportional controller through the fourth controller;

[0018] The fourth controller is used to receive the detection value of the oxygen concentration detector and output a proportional coefficient value corresponding to the detection value.

[0019] In a possible implementation, the supercritical water oxidation system further includes an oxygen concentration detector, a fourth controller, a fifth controller, a low selector, and a high selector;

[0020] The oxygen concentration detector is arranged on the outlet pipe of the reaction device, and is used to detect the oxygen concentration after the reaction in the reaction device; the low selector is electrically connected to the oxygen concentration detector through the fifth controller, and the high selector is electrically connected to the oxygen concentration detector through the fourth controller; the proportional controller, the low selector, the high selector and the second controller are electrically connected in sequence;

[0021] Wherein, the preset value of the fourth controller is lower than the preset value of the fifth controller;

[0022] When the detection value of the oxygen concentration detector is less than the preset value of the fourth controller, the output values ​​of the fourth controller and the fifth controller are both increased; the low selector compares the output value of the proportional controller with the output value of the fifth controller, and outputs the output value of the proportional controller; the high selector compares the output value of the proportional controller with the output value of the fourth controller, and outputs the output value of the fourth controller; when the detection value of the second flow meter is less than the output value of the fourth controller, the control signal output by the second controller increases, so that the opening of the second regulating valve increases to increase the oxygen flow rate;

[0023] When the detection value of the oxygen concentration detector is between the preset value of the fourth controller and the preset value of the fifth controller, the output value of the fourth controller decreases and the output value of the fifth controller increases; the low selector compares the output value of the proportional controller with the output value of the fifth controller, and outputs the output value of the proportional controller; the high selector compares the output value of the proportional controller with the output value of the fourth controller, and outputs the output value of the proportional controller; the detection value of the second flow meter is the same as the output value of the proportional controller, and the opening of the second regulating valve remains unchanged;

[0024] When the detection value of the oxygen concentration detector is greater than the preset value of the fifth controller, the output value of the fourth controller and the output value of the fifth controller are both reduced, and the output value of the fifth controller is greater than the output value of the fourth controller; the low selector compares the output value of the proportional controller with the output value of the fifth controller, and outputs the output value of the fifth controller; the high selector compares the output value of the fifth controller with the output value of the fourth controller, and outputs the output value of the fifth controller; the detection value of the second flowmeter is greater than the oxygen demand value, and the control signal output by the second controller is reduced, so that the opening of the second regulating valve is reduced to reduce the oxygen flow rate.

[0025] In a possible implementation, the supercritical water oxidation system further includes:

[0026] A first pressure transmitter, provided on the oxygen pipeline, for detecting the gas pressure in the oxygen pipeline;

[0027] A second pressure transmitter, provided on the reaction device, for detecting the pressure in the reaction device; and

[0028] a third controller, electrically connected to the first pressure transmitter, the second pressure transmitter and the high-pressure oxygen pump; the third controller is used to receive detection values ​​of the first pressure transmitter and the second pressure transmitter;

[0029] Wherein, when the detection value of the first pressure transmitter is greater than the detection value of the second pressure transmitter, and the difference is greater than a preset value, the control signal output by the third controller is reduced to reduce the rotation speed of the high-pressure oxygen pump;

[0030] When the detection value of the first pressure transmitter is greater than the detection value of the second pressure transmitter, and the difference is less than a preset value, the control signal output by the third controller increases to increase the rotation speed of the high-pressure oxygen pump.

[0031] In a possible implementation manner, both the first flow meter and the second flow meter are Coriolis mass flow meters.

[0032] In a possible implementation, conductive grounding bolts are provided on the inlet and outlet flanges of the second flow meter and the second regulating valve.

[0033] In a possible implementation, the gas outlet of the reaction device has a discharge pipe and a treatment pipe, and valves are provided on the discharge pipe and the treatment pipe; the other end of the treatment pipe is connected to the tail gas treatment device.

[0034] In one possible implementation, an exhaust gas concentration sensor is provided on the gas outlet to detect the gas at the gas outlet; when the gas at the gas outlet meets the emission standards, the valve of the emission pipe is opened and the valve on the treatment pipe is closed; when the gas at the gas outlet does not meet the emission standards, the valve of the emission pipe is closed and the valve on the treatment pipe is opened.

[0035] In the embodiment of the present application, a preset value is input into the first controller, and the first flow meter can detect the flow in the material pipeline in real time, and feed back the detection value to the first controller; the first controller adjusts the opening of the first regulating valve in real time according to the difference between the detection value of the first flow meter and the preset value, so that the flow in the material pipeline is maintained at the preset value. The proportional controller can receive the detection value of the first flow meter, and output the oxygen demand value corresponding to the detection value to the second controller according to the size of the detection value of the first flow meter; the second controller controls the opening of the second regulating valve in real time according to the difference between the oxygen demand value and the detection value of the second flow meter, and adjusts the oxygen flow in the oxygen pipeline. The high-pressure oxygen pump can provide power to the oxygen, so that the oxygen in the oxygen pipeline can be passed into the reaction device. The high-pressure material pump can provide power to the material, so that the material in the material pipeline can enter the reaction device.

[0036] The present invention provides a supercritical water oxidation system. Compared with the prior art, the present invention can adjust the flow of the oxygen pipeline in real time according to the material flow rate and the oxygen content in the tail gas after the reaction, thereby realizing automatic adjustment of the oxygen flow rate according to the change of the material flow rate, which can reduce the occurrence of over-oxygen or under-oxygen in the reaction device, thereby reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a supercritical water oxidation system provided by an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of a second embodiment of a supercritical water oxidation system provided in an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of a third implementation manner of a supercritical water oxidation system provided in an embodiment of the present invention.

[0040] Explanation of the accompanying drawings: 1. High-pressure oxygen pump; 2. Oxygen buffer tank; 3. First pressure transmitter; 4. Second flow meter; 5. Second regulating valve; 6. Second pressure transmitter; 7. High-pressure material pump; 8. First flow meter; 9. First regulating valve; 10. Reaction device; 11. Oxygen concentration detector; 12. Third controller; 13. Second controller; 14. Proportional controller; 15. First controller; 16. Fourth controller; 17. Fifth controller; 18. High selector; 19. Low selector. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] See also Figure 1 , a supercritical water oxidation system provided by the present invention is now described. The supercritical water oxidation system comprises a reaction device 10, an oxygen delivery device and a material delivery device, the oxygen delivery device comprises an oxygen pipeline and a high-pressure oxygen pump 1; the two ends of the oxygen pipeline are respectively connected to the reaction device 10 and the high-pressure oxygen pump 1; the material delivery device comprises a high-pressure material pump 7 and a material pipeline, and the two ends of the material pipeline are respectively connected to the reaction device 10 and the high-pressure material pump 7; a first flow meter 8 and a first regulating valve 9 are provided on the material pipeline; a second flow meter 4 and a second regulating valve 5 are provided on the oxygen pipeline; the supercritical water oxidation system also comprises a first controller 15, a proportional controller 14 and a second controller 13.

[0043] The first controller 15 is electrically connected to the first flow meter 8 and the first regulating valve 9 respectively; the first controller 15 is used to compare the detection value of the first flow meter 8 with the preset value; when the detection value is greater than the preset value, the control signal output by the first controller 15 decreases, so that the opening of the first regulating valve 9 decreases to reduce the material flow rate; when the detection value is less than the preset value, the control signal output by the first controller 15 increases, so that the opening of the first regulating valve 9 increases to increase the material flow rate.

[0044] The proportional controller 14 is electrically connected to the first flow meter 8 and the first controller 15 respectively; the proportional controller 14 is used to receive the detection value of the first flow meter 8 and output the oxygen demand value corresponding to the detection value of the first flow meter 8.

[0045] The second controller 13 is electrically connected to the second flow meter 4, the second regulating valve 5 and the proportional controller 14 respectively; the second controller 13 is used to receive the oxygen demand value and the detection value of the second flow meter 4; when the detection value of the second flow meter 4 is greater than the oxygen demand value, the control signal output by the second controller 13 decreases, so that the opening of the second regulating valve 5 decreases to reduce the oxygen flow rate; when the detection value of the second flow meter 4 is less than the oxygen demand value, the control signal output by the second controller 13 increases, so that the opening of the second regulating valve 5 increases to increase the oxygen flow rate.

[0046] In the application embodiment, a preset value is input into the first controller 15, and the first flowmeter 8 can detect the flow in the material pipeline in real time, and feed back the detection value to the first controller 15; the first controller 15 adjusts the opening of the first regulating valve 9 in real time according to the difference between the detection value of the first flowmeter 8 and the preset value, so that the flow in the material pipeline is maintained at the preset value. The proportional controller 14 can receive the detection value of the first flowmeter 8, and output the oxygen demand value corresponding to the detection value to the second controller 13 according to the size of the detection value of the first flowmeter 8; the second controller 13 controls the opening of the second regulating valve 5 in real time according to the difference between the oxygen demand value and the detection value of the second flowmeter 4, and adjusts the oxygen flow in the oxygen pipeline. The high-pressure oxygen pump 1 can provide power to the oxygen, so that the oxygen in the oxygen pipeline can be passed into the reaction device 10. The high-pressure material pump 7 can provide power to the material, so that the material in the material pipeline can enter the reaction device 10.

[0047] The supercritical water oxidation system provided by the present invention, compared with the prior art, can adjust the flow of the oxygen pipeline in real time according to the flow of the material pipeline, thereby realizing automatic adjustment of the oxygen flow according to the change of the material flow, which can reduce the occurrence of over-oxygen or under-oxygen in the reaction device 10, thereby reducing safety hazards.

[0048] It should be noted that the supercritical water oxidation system is controlled by a distributed control system (DCS for short); the high-pressure oxygen pump 1 has its own frequency converter, and the start and stop and frequency conversion of the high-pressure oxygen pump 1 are all controlled by the DCS. The specific control process is a prior art and will not be repeated here. The first flowmeter 8 can be a Coriolis mass flowmeter with a range ratio of 1:50, which can take into account the measurement of oxygen flow during start-up and stable operation, and it is fed back to the DCS with a current signal of 4 to 20 mA. The high-pressure material pump 7 is used to convert the pressure of the material from low pressure to high pressure, and is controlled to start and stop by the DCS.

[0049] Exemplarily, if the detection value of the first flow meter 8 is F1, the given value of the first controller 15 is SP1, and the detection value of the second flow meter 4 is F2, then the linear proportional relationship of the proportional controller 14 is SP2=K×F1+a, where K is the proportional coefficient, a is a constant, and SP2 reflects the oxygen demand for the oxidation reaction of the material flow F1. When the material flow detection value F1 is lower than the given value SP1, the first controller 15 controls the opening of the first regulating valve 9 to increase until F1=SP1. In the above process, the given value SP2 of the second controller 13 changes in real time with the material flow F1; when the given value SP2 increases and the oxygen flow detection value F2 is lower than the given value SP2, the second controller 13 controls the opening of the second regulating valve 5 to increase until F2=SP2.

[0050] When the material flow value F1 is higher than the given value SP1, the first controller 15 controls the opening of the first regulating valve 9 to decrease until F1 = SP1. In this process, the given value SP2 of the second controller 13 changes in real time with the material flow; when the given value SP2 decreases and the oxygen flow detection value F2 is higher than the given value SP2, the second controller 13 controls the opening of the second regulating valve 5 to decrease until F2 = SP2.

[0051] In some embodiments, Figure 1 As shown, the oxygen pipeline is connected to an oxygen buffer tank 2, and the oxygen buffer tank 2 is located between the high-pressure oxygen pump 1 and the second flow meter 4. The oxygen buffer tank 2 is arranged on the oxygen pipeline to play a buffering role, and when the high-pressure oxygen flows through the flow meter, the oxygen flow rate is ensured to be relatively stable.

[0052] In some embodiments, Figure 2 As shown, the supercritical water oxidation system also includes an oxygen concentration detector 11, which is arranged on the outlet pipe of the reaction device 10 and is used to detect the oxygen concentration after the oxidation reaction in the reaction device 10; the oxygen concentration detector 11 is electrically connected to the proportional controller 14; wherein, after the detection value of the oxygen concentration detector 11 is greater than a preset value, the oxygen demand value output by the proportional controller 14 decreases; after the detection value of the oxygen concentration detector 11 is less than the preset value, the oxygen demand value output by the proportional controller 14 increases.

[0053] It should be understood that the detection value of the oxygen concentration detector 11 reflects the oxygen content after the oxidation of the material. According to the detection value of the oxygen concentration detector 11, it can be judged whether the oxygen in the reaction device 10 is in an excessive state or an insufficient state. After the oxygen concentration of the reaction device 10 after the reaction exceeds the preset value, it means that the oxygen is excessive. At this time, the oxygen demand value output by the proportional controller 14 will decrease. After the second controller 13 receives the reduced oxygen demand value, it can control the opening of the second regulating valve 5 to decrease, thereby reducing the flow of oxygen in the oxygen pipeline. After the oxygen concentration of the reaction device 10 after the reaction is lower than the preset value, it means that the oxygen is insufficient. At this time, the oxygen demand value output by the proportional controller 14 will increase. After receiving the increased oxygen demand value, the second controller 13 can control the opening of the second regulating valve 5 to increase, thereby increasing the oxygen flow in the oxygen pipeline.

[0054] It should be noted that the detection value of the oxygen concentration detector 11 affects the proportional coefficient, that is, the value of K; when the detection value of the oxygen concentration detector 11 is greater than the preset value, the value of the proportional coefficient decreases; when the detection value of the oxygen concentration detector 11 is less than the preset value, the value of the proportional coefficient increases.

[0055] In some embodiments, Figure 2As shown, the supercritical water oxidation system also includes a fourth controller 16, and the oxygen concentration detector 11 is electrically connected to the proportional controller 14 through the fourth controller 16; wherein the fourth controller 16 is used to receive the detection value of the oxygen concentration detector 11 and output a proportional coefficient value corresponding to the detection value.

[0056] It should be noted that the detection value of the oxygen concentration detector 11 is transmitted to the fourth controller 16, and the fourth controller 16 outputs a corresponding proportional coefficient value according to the detection value of the oxygen concentration detector 11. After the proportional controller 14 receives the proportional coefficient value, the size of the oxygen demand value can be controlled. The fourth controller 16 is preset with a proportional coefficient value corresponding to the detection value, so the fourth controller 16 can output a corresponding proportional coefficient value according to the actual detection value.

[0057] For example, after the detection value of the oxygen concentration detector 11 is greater than the preset value, the proportional coefficient value output by the fourth controller 16 decreases, so the oxygen demand value output by the proportional controller 14 also decreases; after receiving the reduced oxygen demand value, the second controller 13 controls the opening of the second regulating valve 5 to decrease, thereby reducing the oxygen flow in the oxygen pipeline.

[0058] After the detection value of the oxygen concentration detector 11 is less than the preset value, the proportional coefficient value output by the fourth controller 16 increases, and then the oxygen demand value output by the proportional controller 14 increases; after receiving the increased oxygen demand value, the second controller 13 controls the opening of the second regulating valve 5 to increase, thereby increasing the oxygen flow in the oxygen pipeline.

[0059] It should be understood that the fourth controller 16 is electrically connected to the oxygen concentration detector 11, and a proportional coefficient value corresponding to the oxygen concentration detection value is preset in the fourth controller 16; when the oxygen concentration detector 11 detects the oxygen concentration in the reaction device 10, the fourth controller 16 can output the corresponding proportional coefficient value according to the detection value of the oxygen concentration detector 11, thereby facilitating the second controller 13 to control the oxygen flow in the oxygen pipeline.

[0060] In some embodiments, Figure 3 As shown, the supercritical water oxidation system also includes an oxygen concentration detector 11, a fourth controller 16, a fifth controller 17, a low selector 19 and a high selector 18; the oxygen concentration detector 11 is arranged on the outlet pipe of the reaction device 10, and is used to detect the oxygen concentration after the reaction in the reaction device 10; the low selector 19 is electrically connected to the oxygen concentration detector 11 through the fifth controller 17, and the high selector 18 is electrically connected to the oxygen concentration detector 11 through the fourth controller 16; the proportional controller 14, the low selector 19, the high selector 18 and the second controller 13 are electrically connected in sequence.

[0061] Among them, the preset value of the fourth controller 16 is lower than the preset value of the fifth controller 17; when the detection value of the oxygen concentration detector 11 is less than the preset value of the fourth controller 16, the output values ​​of the fourth controller 16 and the fifth controller 17 are increased; the low selector 19 compares the output value of the proportional controller 14 with the output value of the fifth controller 17, and outputs the output value of the proportional controller 14; the high selector 18 compares the output value of the proportional controller 14 with the output value of the fourth controller 16, and outputs the output value of the fourth controller 16; the detection value of the second flowmeter 4 is less than the output value of the fourth controller 16, and the control signal output by the second controller 13 increases, so that the opening of the second regulating valve 5 increases to increase the oxygen flow rate.

[0062] When the detection value of the oxygen concentration detector 11 is between the preset value of the fourth controller 16 and the preset value of the fifth controller 17, the output value of the fourth controller 16 decreases and the output value of the fifth controller 17 increases; the low selector 19 compares the output value of the proportional controller 14 with the output value of the fifth controller 17, and outputs the output value of the proportional controller 14; the high selector 18 compares the output value of the proportional controller 14 with the output value of the fourth controller 16, and outputs the output value of the proportional controller 14; the detection value of the second flowmeter 4 is the same as the output value of the proportional controller 14, and the opening of the second regulating valve 5 remains unchanged.

[0063] When the detection value of the oxygen concentration detector 11 is greater than the preset value of the fifth controller 17, the output value of the fourth controller 16 and the output value of the fifth controller 17 are both reduced, and the output value of the fifth controller 17 is greater than the output value of the fourth controller 16; the low selector 19 compares the output value of the proportional controller 14 with the output value of the fifth controller 17, and outputs the output value of the fifth controller 17; the high selector 18 compares the output value of the fifth controller 17 with the output value of the fourth controller 16, and outputs the output value of the fifth controller 17; the detection value of the second flowmeter 4 is greater than the oxygen demand value, and the control signal output by the second controller 13 is reduced, so that the opening of the second regulating valve 5 is reduced to reduce the oxygen flow rate.

[0064] It should be understood that both the low selector 19 and the high selector 18 are signal selectors, and both the low selector 19 and the high selector 18 are prior art and will not be described in detail herein. The high selector 18 can compare two input values ​​and output a higher value; the low selector 19 can compare two input values ​​and output a lower value.

[0065] It should be noted that the ratio controller 14 is electrically connected to the low selector 19, the low selector 19 is electrically connected to the high selector 18, and the high selector 18 is electrically connected to the second controller 13. Through the above settings, the system can screen the output values ​​of the ratio controller, the fourth controller 16 and the fifth controller 17, so that the oxygen content after the reaction is always within a reasonable control range.

[0066] Exemplarily, the detection value of the first flow meter 8 is F1, the detection value of the second flow meter 4 is F2, the detection value of the oxygen concentration detector 11 is A1, the output value of the proportional controller 14 is SP1, the output value of the fourth controller 16 is SP3, and the output value of the fifth controller 17 is SP2; the preset value of the fourth controller 16 is 5%, and the preset value of the fifth controller 17 is 10%.

[0067] When in equilibrium, ie, SP1=SP2=SP3, the oxygen content is in the range of 5% to 10%. Due to changes in temperature, pressure, material composition, and material concentration in the reaction device 10, the detection value A1 of the oxygen concentration detector 11 also changes accordingly.

[0068] When the detection value A1 is less than 5%, the output value SP3 of the fourth controller 16 and the output value SP2 of the fifth controller 17 both increase. At this time, SP1 and SP2 are first compared in the low selector 19; since SP1 is less than SP2, the low selector 19 outputs SP1; then SP1 and SP3 are compared in the high selector 18, and since SP1 is less than SP3, the high selector 18 outputs SP3; after the second controller 13 receives SP3, the oxygen detection value F2 is less than SP3 at this time, so the second controller 13 can increase the opening of the second regulating valve 5, thereby increasing the oxygen flow in the oxygen pipeline, until the oxygen detection value A1 after the reaction is equal to 5%.

[0069] When the detection value A1 is between 5% and 10%, the output value SP3 of the fourth controller 16 decreases, and the output value SP2 of the fifth controller 17 increases; at this time, SP1 and SP2 are first compared in the low selector 19; since SP1 is less than SP2, the low selector 19 outputs SP1; then SP1 and SP3 are compared in the high selector 18, and since SP1 is greater than SP3, the high selector 18 outputs SP1. At this time, the detection value F2 of the oxygen flow rate does not change compared with SP1, and the second controller 13 keeps the opening of the second regulating valve 5 unchanged.

[0070] When the detection value A1 is greater than 10%, the output value SP3 of the fourth controller 16 and the output value SP2 of the fifth controller 17 both become smaller. At this time, SP1 and SP2 are first compared in the low selector 19; since SP1 is greater than SP2, the low selector 19 outputs SP2; then SP2 and SP3 are compared in the high selector 18; since the detection value A1 is greater than 10%, and the difference between the preset value of SP2 and the detection value A1 is less than the difference between the preset value of SP3 and the detection value A1, the reduction amplitude of SP3 is greater than the reduction amplitude of SP2, that is, SP2 is greater than SP3, and the high selector 18 will output SP2 after comparing SP2 and SP3; after the second controller 13 receives the reduced SP2, since the detection value F2 of the oxygen flow is greater than SP2, the second controller 13 can control the opening of the second regulating valve 5 to decrease, thereby reducing the oxygen flow in the oxygen pipeline until the oxygen detection value A1 after the reaction is equal to 10%.

[0071] In summary, when the concentration of oxygen in the reaction device 10 is within the range of 5% to 10%, there is no need to adjust the oxygen flow in the oxygen pipeline; when the concentration of oxygen in the reaction device 10 is lower than 5%, the second controller 13 can increase the opening of the second regulating valve 5 to increase the oxygen flow in the oxygen pipeline. When the concentration of oxygen in the reaction device 10 is higher than 10%, the second controller 13 can reduce the opening of the second regulating valve 5 to reduce the oxygen flow in the oxygen pipeline.

[0072] Exemplarily, when the detection value A1 is in the range of 5% to 10%, when the flow rate of the material pipeline needs to be reduced, the preset value of the first controller 15 is reduced, and the first controller 15 controls the opening of the first regulating valve 9 to reduce, thereby reducing the material flow rate in the material pipeline. After the material flow rate F1 decreases, SP1 decreases; since the detection value A1 changes in the range of 5% to 10%, SP2 increases and SP3 decreases; SP1 and SP2 are first compared in the low selector 19, and the low selector 19 outputs SP1; then SP1 and SP3 are compared in the high selector 18, and the high selector 18 outputs a high value between SP1 and SP3; at this time, since the detection value F2 is greater than the high value output by the high selector 18, after the second controller 13 receives the high value output by the high selector 18, it can control the opening of the second regulating valve 5 to decrease to reduce the flow rate of oxygen until a new equilibrium state is reached.

[0073] Exemplarily, when the detection value A1 is in the range of 5% to 10%, when the flow rate of the material pipeline needs to be increased, the preset value of the first controller 15 is increased, and the first controller 15 controls the opening of the first regulating valve 9 to increase, thereby increasing the material flow rate in the material pipeline. After the material flow rate F1 increases, SP1 increases; since the detection value A1 changes in the range of 5% to 10%, SP2 increases and SP3 decreases; SP1 and SP2 are first compared in the low selector 19, and the low selector 19 outputs a low value between SP1 and SP2, and then the low value output by the low selector 19 is compared with SP3 in the high selector 18, and the high selector 18 outputs a high value; therefore, the low value between SP1 and SP2 is finally input to the second controller 13; at this time, the measured value F2 of oxygen is lower than the low value, and the second controller 13 controls the opening of the second regulating valve 5 to increase to increase the oxygen flow rate until a new equilibrium state is reached.

[0074] In some embodiments, Figure 1-Figure 3 As shown, the supercritical water oxidation system also includes a first pressure transmitter 3, a second pressure transmitter 6 and a third controller 12; the first pressure transmitter 3 is arranged on the oxygen pipeline, and is used to detect the gas pressure in the oxygen pipeline; the second pressure transmitter 6 is arranged on the reaction device 10, and is used to detect the pressure in the reaction device 10; the third controller 12 is electrically connected to the first pressure transmitter 3, the second pressure transmitter 6 and the high-pressure oxygen pump 1; the third controller 12 is used to receive the detection values ​​of the first pressure transmitter 3 and the second pressure transmitter 6. Among them, when the detection value of the first pressure transmitter 3 is greater than the detection value of the second pressure transmitter 6, and the difference is greater than the preset value, the control signal output by the third controller 12 is reduced to reduce the speed of the high-pressure oxygen pump 1; when the detection value of the first pressure transmitter 3 is greater than the detection value of the second pressure transmitter 6, and the difference is less than the preset value, the control signal output by the third controller 12 is increased to increase the speed of the high-pressure oxygen pump 1. The first pressure transmitter 3 can be arranged on the oxygen buffer tank 2 to detect the pressure in the oxygen buffer tank 2.

[0075] It should be understood that the reaction device 10 may be a reactor; through the above arrangement, it can be ensured that the gas pressure in the oxygen pipeline is always higher than the pressure in the reaction device 10, so that the oxygen in the oxygen pipeline can be passed into the reaction device 10. And by presetting the pressure value, it can be avoided that the pressure difference between the oxygen pipeline and the reaction device 10 is too high, resulting in an excessively fast oxygen flow rate; it can also be avoided that the reaction medium in the reaction device 10 flows back into the oxygen pipeline due to insufficient oxygen pressure. Exemplarily, the pressure difference between the first pressure transmitter 3 and the second pressure transmitter 6 can be 2MPa.

[0076] In some embodiments, Figure 1As shown, the first flowmeter 8 and the second flowmeter 4 are both Coriolis mass flowmeters; the inlet and outlet flanges of the second flowmeter 4 and the second regulating valve 5 are both provided with conductive grounding bolts (not shown in the figure). Through the above arrangement, static electricity can be reduced during the oxygen delivery process, thereby reducing the occurrence of explosions. It should be noted that in addition to providing conductive grounding bolts on the inlet and outlet flanges of the second flowmeter 4 and the second regulating valve 5, degreasing and degreasing treatment is also required, and the corresponding exempted materials are selected; the exempted materials can be copper, nickel-based alloys, etc.

[0077] In some embodiments, Figure 1 As shown, the gas outlet of the reaction device 10 has an exhaust pipe (not shown in the figure) and a treatment pipe (not shown in the figure), and valves are provided on the exhaust pipe and the treatment pipe; the other end of the treatment pipe is connected to the exhaust gas treatment device; an exhaust gas concentration sensor is provided on the gas outlet to detect the gas at the gas outlet; when the gas at the gas outlet meets the emission standards, the valve of the exhaust pipe is opened and the valve on the treatment pipe is closed; when the gas at the gas outlet does not meet the emission standards, the valve of the exhaust pipe is closed and the valve on the treatment pipe is opened.

[0078] It should be understood that an exhaust gas concentration detection sensor (not shown in the figure) is provided at the air outlet. The exhaust gas concentration detection sensor is a prior art and will not be described in detail here. By detecting the concentration of the air outlet through the exhaust gas concentration sensor, it is possible to determine whether the position after the reaction meets the emission standards, thereby facilitating the control of the corresponding valve opening and processing the exhaust gas after the reaction.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A supercritical water oxidation system, characterized in that: It comprises a reaction device, an oxygen delivery device and a material delivery device, wherein the oxygen delivery device comprises an oxygen pipeline and a high-pressure oxygen pump; two ends of the oxygen pipeline are respectively connected to the reaction device and the high-pressure oxygen pump; The material conveying device comprises a high-pressure material pump and a material pipeline, and both ends of the material pipeline are respectively connected to the reaction device and the high-pressure material pump; The material pipeline is provided with a first flow meter and a first regulating valve; the oxygen pipeline is provided with a second flow meter and a second regulating valve; The supercritical water oxidation system also includes: a first controller, electrically connected to the first flow meter and the first regulating valve respectively; a proportional controller, electrically connected to the first flow meter and the first controller respectively; a second controller, electrically connected to the second flow meter, the second regulating valve and the proportional controller respectively; The supercritical water oxidation system also includes an oxygen concentration detector, a fourth controller, a fifth controller, a low selector and a high selector; The oxygen concentration detector is arranged on the outlet pipe of the reaction device, and is used to detect the oxygen concentration after the reaction in the reaction device; the low selector is electrically connected to the oxygen concentration detector through the fifth controller, and the high selector is electrically connected to the oxygen concentration detector through the fourth controller; the proportional controller, the low selector, the high selector and the second controller are electrically connected in sequence; Wherein, the preset value of the fourth controller is lower than the preset value of the fifth controller.

2. A supercritical water oxidation system according to claim 1, characterized in that: The oxygen pipeline is connected to an oxygen buffer tank, and the oxygen buffer tank is located between the high-pressure oxygen pump and the second flow meter.

3. A supercritical water oxidation system according to claim 1, characterized in that: The first controller is used to compare the detection value of the first flow meter with a preset value; when the detection value is greater than the preset value, the control signal output by the first controller decreases, thereby reducing the opening of the first regulating valve to reduce the material flow rate; when the detection value is less than the preset value, the control signal output by the first controller increases, thereby increasing the opening of the first regulating valve to increase the material flow rate.

4. A supercritical water oxidation system according to claim 1, characterized in that: The proportional controller is used to receive the detection value of the first flow meter and output an oxygen demand value corresponding to the detection value of the first flow meter.

5. A supercritical water oxidation system according to claim 1, characterized in that: The second controller is used to receive the oxygen demand value and the detection value of the second flow meter; when the detection value of the second flow meter is greater than the oxygen demand value, the control signal output by the second controller decreases, so that the opening of the second regulating valve decreases to reduce the oxygen flow rate; when the detection value of the second flow meter is less than the oxygen demand value, the control signal output by the second controller increases, so that the opening of the second regulating valve increases to increase the oxygen flow rate.

6. A supercritical water oxidation system according to claim 1, characterized in that: When the detection value of the oxygen concentration detector is less than the preset value of the fourth controller, the output values ​​of the fourth controller and the fifth controller are both increased; the low selector compares the output value of the proportional controller with the output value of the fifth controller, and outputs the output value of the proportional controller; the high selector compares the output value of the proportional controller with the output value of the fourth controller, and outputs the output value of the fourth controller; The detection value of the second flow meter is smaller than the output value of the fourth controller, and the control signal output by the second controller increases, so that the opening of the second regulating valve increases to increase the oxygen flow rate; When the detection value of the oxygen concentration detector is between the preset value of the fourth controller and the preset value of the fifth controller, the output value of the fourth controller decreases and the output value of the fifth controller increases; the low selector compares the output value of the proportional controller with the output value of the fifth controller, and outputs the output value of the proportional controller; the high selector compares the output value of the proportional controller with the output value of the fourth controller, and outputs the output value of the proportional controller; The detection value of the second flow meter is the same as the output value of the proportional controller, and the opening degree of the second regulating valve remains unchanged; When the detection value of the oxygen concentration detector is greater than the preset value of the fifth controller, the output value of the fourth controller and the output value of the fifth controller are both reduced, and the output value of the fifth controller is greater than the output value of the fourth controller; the low selector compares the output value of the proportional controller with the output value of the fifth controller, and outputs the output value of the fifth controller; the high selector compares the output value of the fifth controller with the output value of the fourth controller, and outputs the output value of the fifth controller; The detection value of the second flow meter is greater than the oxygen demand value, and the control signal output by the second controller decreases, so that the opening of the second regulating valve decreases to reduce the oxygen flow rate.

7. A supercritical water oxidation system according to claim 1 or 2, characterized in that: The supercritical water oxidation system also includes: A first pressure transmitter, provided on the oxygen pipeline, for detecting the gas pressure in the oxygen pipeline; A second pressure transmitter, provided on the reaction device, for detecting the pressure in the reaction device; and a third controller, electrically connected to the first pressure transmitter, the second pressure transmitter and the high-pressure oxygen pump; the third controller is used to receive detection values ​​of the first pressure transmitter and the second pressure transmitter; Wherein, when the detection value of the first pressure transmitter is greater than the detection value of the second pressure transmitter, and the difference is greater than a preset value, the control signal output by the third controller is reduced to reduce the rotation speed of the high-pressure oxygen pump; When the detection value of the first pressure transmitter is greater than the detection value of the second pressure transmitter, and the difference is less than a preset value, the control signal output by the third controller increases to increase the rotation speed of the high-pressure oxygen pump.

8. A supercritical water oxidation system according to claim 1 or 2, characterized in that: The first flow meter and the second flow meter are both Coriolis mass flow meters.

9. A supercritical water oxidation system according to claim 1 or 2, characterized in that: The inlet and outlet flanges of the second flow meter and the second regulating valve are both provided with conductive grounding bolts.

10. A supercritical water oxidation system according to claim 1 or 2, characterized in that: The gas outlet of the reaction device has a discharge pipeline and a treatment pipeline, and valves are provided on the discharge pipeline and the treatment pipeline; the other end of the treatment pipeline is connected to the tail gas treatment device; An exhaust gas concentration sensor is provided on the gas outlet to detect the gas at the gas outlet; when the gas at the gas outlet meets the emission standards, the valve of the emission pipe is opened and the valve on the treatment pipe is closed; when the gas at the gas outlet does not meet the emission standards, the valve of the emission pipe is closed and the valve on the treatment pipe is opened.

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