Supercritical water oxidation high temperature steam waste heat comprehensive recovery system

Abstract

The present invention provides a supercritical water oxidation high-temperature steam waste heat comprehensive recycling system, which belongs to the field of chemical industry and environmental protection technology, including a supercritical water oxidation reactor, and also including a pressure reducing device connected to the gas phase outlet of the supercritical water oxidation reactor; a gas-liquid separation tank connected to the outlet of the pressure reducing device for gas-liquid separation; and a water bath heating box connected to the gas phase outlet of the gas-liquid separation tank, solid organic waste is contained in the water bath heating box, and the water bath heating box is used to use the high-temperature hot steam at the outlet of the gas-liquid separation tank to ablate and stir the solid organic waste. The present invention introduces the high-temperature hot steam generated by supercritical water oxidation into the water bath heating box, and uses the high-temperature hot steam with pressure to impact and stir, so as to accelerate the ablation of the solid organic waste, maintain the fluidity of the organic waste, and provide convenience for the compatibility work.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry and environmental protection, and more specifically, relates to a comprehensive recycling system of waste heat of supercritical water oxidation high-temperature steam. Background Art

[0002] Supercritical water refers to water when the air pressure and temperature reach a certain value, and the density of water expanded by high temperature is exactly the same as the density of water vapor compressed by high pressure. At this time, there is no difference between liquid and gas of water, and they are completely blended together to become a new fluid with high pressure and high temperature. Andrea pointed out that supercritical water has two significant characteristics. One is that it has strong reactivity (the original version said it has strong oxidizing ability). Put the substance to be treated into supercritical water, fill it with oxygen and hydrogen peroxide, and the substance will be oxidized and hydrolyzed. Some can also spontaneously combust, with flames coming out of the water. Another characteristic is that it can be mixed with substances such as oil and has a wide range of fusion capabilities.

[0003] Supercritical water oxidation technology is used to treat hazardous waste. It uses the heat of organic combustion to provide kinetic energy for the operation of the reaction system. Therefore, a certain concentration of organic matter needs to be added to the reactor for combustion to maintain normal operation of the reaction. In order to allow the hazardous waste to fully react, the inner cylinder of the supercritical water oxidation device is in a high temperature and high pressure state. In order to maintain the internal and external pressure balance of the inner cylinder of the supercritical water oxidation device and avoid deformation of the inner cylinder due to high pressure, high-pressure water is continuously supplied to the outside of the reactor. The reaction products bring out a large amount of hot steam, and its indicators are all lower than the atmospheric pollutant emission standards and can be discharged directly, but the comprehensive utilization of thermal energy is not achieved.

[0004] Among the hazardous wastes disposed of using supercritical technology, a large amount of solid organic waste with very low solubility at room temperature will enter the factory. Due to their large size and hardness, they cannot be mechanically stirred. The materials entering the supercritical water oxidation reactor require good fluidity, which brings high manual crushing and electricity costs to the mixing work. Summary of the invention

[0005] The purpose of the present invention is to provide a supercritical water oxidation high-temperature steam waste heat comprehensive recycling system, aiming to solve the current solid organic waste difficult to dissolve, the compatibility of manual crushing is difficult, and the cost is increased.

[0006] To achieve the above object, the technical solution adopted by the present invention is: to provide a supercritical water oxidation high-temperature steam waste heat comprehensive recycling system, including: a supercritical water oxidation reactor, and also including:

[0007] a pressure reducing device, connected to the gas phase outlet of the supercritical water oxidation reactor;

[0008] A gas-liquid separation tank, connected to the outlet of the pressure reducing device, for separating gas and liquid;

[0009] A water bath heating box is connected to the gas phase outlet of the gas-liquid separation tank. Solid organic waste is contained in the water bath heating box. The water bath heating box is used to utilize the high-temperature hot steam at the outlet of the gas-liquid separation tank to melt and stir the solid organic waste.

[0010] Furthermore, the water bath heating box includes a box body and at least one circle of second steam pipes arranged in a clockwise or counterclockwise direction, the second steam pipes are arranged inside the box body, the second steam pipes have a second steam pipe inlet and at least one second steam pipe outlet, and the second steam pipe inlet is connected to the gas phase outlet of the gas-liquid separation tank.

[0011] Furthermore, there is at least one second steam pipe outlet, and the outlet setting direction of each second steam pipe outlet can enable the steam from each second steam pipe outlet to form a clockwise or counterclockwise stirring airflow in the box.

[0012] Furthermore, the second steam pipe is a spiral coil.

[0013] Furthermore, there are four second steam pipe outlets, and adjacent second steam pipe outlets are vertically arranged.

[0014] Furthermore, it also includes an air-temperature vaporizer, which is provided with a first steam pipe and a liquid oxygen pipeline that are capable of heat exchange and are independent of each other, and the first steam pipe is connected to the gas phase outlet of the gas-liquid separation tank.

[0015] Furthermore, the first steam pipe is provided between every two adjacent rows of the liquid oxygen pipes near the liquid inlet of the air-temperature vaporizer.

[0016] Furthermore, the gas phase outlet of the gas-liquid separation tank is provided with a first branch and a second branch, the first branch is connected to the first steam pipe of the air-temperature vaporizer, and the second branch is connected to the water bath heating box.

[0017] Furthermore, the first steam pipe is provided with a first steam pipe inlet and a first steam pipe outlet, and the first steam pipe outlet is communicated with a bottom steam coil disposed at the bottom of the air-temperature evaporator for collecting condensed water.

[0018] Furthermore, valves are provided between the supercritical water oxidation reactor and the pressure reducing device, between the pressure reducing device and the gas-liquid separation tank, and between the gas-liquid separation tank and the air-temperature vaporizer and the water bath heating box.

[0019] The beneficial effect of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention is that: compared with the prior art, the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system of the present invention introduces the high-temperature hot steam generated by supercritical water oxidation into a water bath heating box, and uses pressurized high-temperature hot steam to impact and stir the solid organic waste in the water bath heating box, thereby accelerating the ablation of the solid organic waste, maintaining the fluidity of the organic waste, and providing convenience for the compatibility work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a system for comprehensive recycling of waste heat from supercritical water oxidation high-temperature steam provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the internal structure of the water bath heating box;

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of the hollow warm vaporizer;

[0024] Figure 4 for Figure 3 Bottom view of

[0025] Figure 5 A schematic diagram of the positional relationship between the first steam pipe and the liquid oxygen pipe of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided in an embodiment of the present invention;

[0026] Figure 6 A schematic structural diagram of the first steam pipe of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided in an embodiment of the present invention;

[0027] In the figure: 1. supercritical water oxidation reactor; 2. pressure reducing device; 3. gas-liquid separation tank; 4. valve; 5. water bath heating box; 6. second steam pipe; 7. air-temperature vaporizer; 8. liquid inlet; 9. gas outlet; 10. first steam pipe; 11. first steam pipe inlet; 12. condensate outlet; 15. bottom steam coil; 16. liquid oxygen pipeline; 17. second steam pipe inlet; 18. second steam pipe outlet; 19. box body. DETAILED DESCRIPTION

[0028] 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.

[0029] Please also read Figures 1 to 5 The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention is now described. The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system comprises a supercritical water oxidation reactor 1, and also comprises:

[0030] A pressure reducing device 2 connected to the gas phase outlet of the supercritical water oxidation reactor 1;

[0031] A gas-liquid separation tank 3 is connected to the outlet of the pressure reducing device 2 and is used for separating gas and liquid;

[0032] The water bath heating box 5 is connected to the gas phase outlet of the gas-liquid separation tank 3 . Solid organic waste is contained in the water bath heating box 5 . The water bath heating box 5 is used to utilize the high-temperature hot steam at the outlet of the gas-liquid separation tank 3 to melt and stir the solid organic waste.

[0033] The present invention is applicable to chemical industry and environmental protection related fields, and mainly involves the comprehensive utilization of waste heat steam in the process of supercritical water oxidation treatment of hazardous waste. High temperature and high pressure are the normal state under the supercritical water state. The use of supercritical water oxidation technology to treat hazardous waste requires a large amount of water. The hot steam generated after the reaction is rich, and its indicators are all lower than the atmospheric pollutant emission standards. It can be discharged directly, but a large amount of heat energy is lost. Therefore, it is necessary to combine its own process and comprehensively utilize steam thermal energy to replace direct electric heating devices to ensure the safety of plant operations and save costs.

[0034] Among the hazardous wastes disposed of by supercritical technology, a large amount of solid organic wastes with very low solubility at room temperature will enter the factory, and the materials entering the supercritical reactor need good fluidity, which brings high manual crushing and electricity costs to the matching work. The high-temperature hot steam generated by supercritical water oxidation is introduced into the special water bath heating box 5 to accelerate the melting of the solid organic waste. The solid organic waste entering the factory is generally stored in ton barrels, in blocks, large in size and hard. Mechanical stirring cannot be used when entering the water bath heating box 5. Mechanical stirring will cause the shaft and blades of the mixer to deform. In severe cases, it will cause the mixer to get stuck, burn the motor and cause a fire. Therefore, it is necessary to reduce unnecessary equipment use; in order to save costs, at room temperature, solid organic waste is difficult to dissolve in water, and the water temperature needs to be increased. If water heating is directly used, corresponding equipment needs to be added, which increases electricity costs. If hot water is directly connected from the liquid phase of the plant area and introduced into the special water bath heating box 5, it will waste labor and fail to maintain a constant temperature. Especially in winter, the water temperature drops too fast and the organic waste will solidify again.

[0035] In order to accelerate the rapid ablation of solid waste, the high-temperature hot steam generated by the supercritical water oxidation reaction is comprehensively utilized, and a stirring heating water tank powered by hot steam is designed to effectively save production costs; the specific technical solution is to connect the gas phase outlet in the supercritical water oxidation reactor 1, pass through the pressure reducing device 2, and enter the gas-liquid separation tank 3, and lead out a branch at the gas phase outlet of the gas-liquid separation tank 3, which is connected to the water bath heating box 5. Pressurized hot steam is used during ablation. The impact of the steam stirs the solid organic waste in the water, which accelerates the ablation of the solid organic waste, while continuously heating the water bath heating box 5 to maintain the fluidity of the organic waste liquid and continuously provide raw materials for compatibility.

[0036] The beneficial effect of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention is that: compared with the prior art, the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system of the present invention introduces the high-temperature hot steam generated by supercritical water oxidation into a water bath heating box, and uses pressurized high-temperature hot steam to impact and stir the solid organic waste in the water bath heating box, thereby accelerating the ablation of the solid organic waste, maintaining the fluidity of the organic waste, and providing convenience for the compatibility work.

[0037] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 The water bath heating box 5 includes a box body 19 and at least one circle of second steam pipes 6 arranged in a clockwise or counterclockwise direction, the second steam pipes 6 are arranged inside the box body, the second steam pipes 6 have a second steam pipe inlet 17 and at least one second steam pipe outlet 18, the second steam pipe inlet 17 is connected to the gas phase outlet of the gas-liquid separation tank 3; the high-temperature hot steam of the gas-liquid separation tank 3 enters the water bath heating box 5, and the solid organic hazardous waste that is difficult to crush is introduced into the water bath heating box 5 in advance, and the impact stirring effect of the pressurized high-temperature steam is used to accelerate the ablation of the solid organic waste, maintain the fluidity of the organic waste, and provide convenience for the compatibility work.

[0038] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 The second steam pipe outlet 18 has at least one, and the outlet setting direction of each second steam pipe outlet 18 can enable the steam of each second steam pipe outlet 18 to form a clockwise or counterclockwise stirring airflow in the box body, further increasing the impact stirring effect of the pressurized high-temperature steam, accelerating the ablation of the solid organic waste in the water bath heating box 5, maintaining the fluidity of the organic waste, and providing convenience for the compatibility work.

[0039] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 ; The second steam pipe 6 is provided with a plurality of outlets; to further enhance the impact stirring effect of the steam, preferably, the outlet of the second steam pipe 6 can be set in a direction conducive to steam stirring, and the impact force of the pressurized steam is used for stirring, thereby accelerating the ablation of the solid waste and continuously heating the water bath heating box 5 to maintain the fluidity of the organic waste liquid and continuously provide raw materials for the compatibility.

[0040] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 The second steam pipe 6 is a spiral coil, which is arranged at the corners and edges of the water bath heating box 5. The second steam pipe 6 is arranged at the four corners and edges of the water bath heating box 5 to increase the impact and stirring effect of the high-temperature hot steam and accelerate the melting of solid organic waste.

[0041] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 There are four second steam pipe outlets 18, and the adjacent second steam pipe outlets 18 are arranged vertically, which can ensure that the high-temperature hot steam at the outlet of the second steam pipe outlet 18 can easily form a clockwise or counterclockwise stirring airflow to accelerate the melting of solid organic waste.

[0042] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 , and also includes an air-temperature vaporizer 7, the air-temperature vaporizer 7 is provided with a first steam pipe 10 and a liquid oxygen pipeline 16 that can exchange heat and are independent of each other, the first steam pipe 10 is connected to the gas phase outlet of the gas-liquid separation tank 3; supercritical water oxidation uses organic matter combustion to provide energy, and also requires oxygen to maintain combustion. The oxygen stored in the plant area usually exists in liquid form. During normal operation, liquid oxygen vaporizes and feeds the reactor in gas form. An air-temperature vaporizer is usually used to accelerate the vaporization of liquid oxygen, but the efficiency The result is not obvious. As the air temperature around the air-temperature vaporizer decreases, the liquid oxygen inlet area of ​​the air-temperature vaporizer begins to frost and ice, which greatly reduces the vaporization effect of the liquid oxygen. For this reason, the air-temperature vaporization structure is optimized and transformed to improve the vaporization effect of the air-temperature vaporizer; the high-temperature hot steam of the gas-liquid separation tank 3 enters and condenses from the bottom of the air-temperature vaporizer 7, and is then reused in the supercritical water oxidation system to avoid frost and ice at the liquid inlet 8 of the air-temperature vaporizer 7, thereby improving the vaporization effect of the air-temperature vaporizer 7.

[0043] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6The first steam pipe is provided between each two adjacent rows of the liquid oxygen pipelines near the liquid inlet of the air-temperature vaporizer; the shape of the first steam pipe 10 is the same as that of the liquid oxygen pipeline 16, and is provided between two adjacent rows of liquid oxygen pipelines 16. The first steam pipe 10 and the adjacent liquid oxygen pipeline 16 radiate heat exchange, and the steam enters through the first steam pipe inlet 11 to prevent the liquid oxygen pipeline 16 from frosting and icing, and finally circulates out through the bottom steam coil 15, and the condensed water is collected through the second steam pipe outlet 12; there are 1-5 first steam pipes 10; preferably, there are 2 first steam pipes 10, and two rows of air-temperature vaporization plates are added at the liquid oxygen liquid inlet 8, which are used for steam heat dissipation and cooling at the liquid oxygen inlet, to prevent frosting and icing of the liquid oxygen inlet, reduce manual defrosting, and use the heat dissipation of hot steam to accelerate the vaporization of coolant such as liquid oxygen, and the vaporized oxygen is discharged from the air outlet 9, thereby improving the vaporization effect of the air-temperature vaporizer 7.

[0044] It should be noted here that the air-temperature vaporizer 7 of the present invention is not only used for vaporizing liquid oxygen, but can also be used for vaporizing other coolants. The principle is to use high-temperature hot steam to dissipate heat to accelerate vaporization and prevent frost and ice in the inlet area.

[0045] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 The gas phase outlet of the gas-liquid separation tank 3 is provided with a first branch and a second branch, the first branch is connected to the first steam pipe of the air-temperature vaporizer 7, and the second branch is connected to the water bath heating box 5; the high-temperature hot steam of the gas-liquid separation tank 3 enters and is condensed and collected from the bottom of the air-temperature vaporizer 7, and then reused in the supercritical water oxidation system to avoid frost and ice at the liquid inlet 8 of the air-temperature vaporizer 7, thereby improving the vaporization effect of the air-temperature vaporizer 7; the high-temperature hot steam of the gas-liquid separation tank 3 enters the water bath heating box 5, and the solid organic hazardous waste that is difficult to crush is introduced into the water bath heating box 5 in advance, and the impact stirring effect of the high-temperature steam with pressure is used to accelerate the melting of the solid organic waste, maintain the fluidity of the organic waste, and provide convenience for the compatibility work.

[0046] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 The first steam pipe is provided with a first steam pipe inlet and a first steam pipe outlet. The first steam pipe outlet 11 is connected to a bottom steam coil 15 provided at the bottom of the air-temperature evaporator 7 for collecting condensed water. The collected condensed water is reused in the supercritical water oxidation system to save water resources.

[0047] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6Valves 4 are provided between the supercritical water oxidation reactor and the pressure reducing device 2, between the pressure reducing device 2 and the gas-liquid separation tank 3, and between the gas-liquid separation tank 3 and the air-temperature vaporizer 7 and the water bath heating box 5.

[0048] As a specific implementation of the supercritical water oxidation high-temperature steam waste heat comprehensive recycling system provided by the present invention, please refer to Figures 1 to 6 A valve 4 is provided between the supercritical water oxidation reactor 1 and the pressure reducing device 2, between the pressure reducing device 2 and the gas-liquid separation tank, and between the gas-liquid separation tank 3 and the first steam pipe 10 and the second steam pipe 6. The valve 4 can control the steam and flow; preferably, the valve 4 is a butterfly valve.

[0049] 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 high-temperature steam waste heat comprehensive recycling system, comprising a supercritical water oxidation reactor, characterized in that: Also includes: a pressure reducing device, connected to the gas phase outlet of the supercritical water oxidation reactor; A gas-liquid separation tank, connected to the outlet of the pressure reducing device, for separating gas and liquid; as well as A water bath heating box is connected to the gas phase outlet of the gas-liquid separation tank, and solid organic waste is contained in the water bath heating box; Wherein, the water bath heating box is used to utilize the high-temperature hot steam at the outlet of the gas-liquid separation tank to melt and stir the solid organic waste; It also includes an air-temperature vaporizer, the air-temperature vaporizer is provided with a first steam pipe and a liquid oxygen pipe that are capable of heat exchange and are independent of each other, the first steam pipe is connected to the gas phase outlet of the gas-liquid separation tank; The first steam pipe is provided between each two adjacent rows of the liquid oxygen pipes near the liquid inlet of the air-temperature vaporizer; Valves are provided between the supercritical water oxidation reactor and the pressure reducing device, between the pressure reducing device and the gas-liquid separation tank, and between the gas-liquid separation tank and the air-temperature vaporizer and the water bath heating box, and the valves are butterfly valves.

2. The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system according to claim 1 is characterized in that: The water bath heating box includes a box body and at least one circle of second steam pipes arranged in a clockwise or counterclockwise direction, the second steam pipes are arranged inside the box body, the second steam pipes have a second steam pipe inlet and at least one second steam pipe outlet, and the second steam pipe inlet is connected to the gas phase outlet of the gas-liquid separation tank.

3. The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system according to claim 2 is characterized in that: There is at least one second steam pipe outlet, and the outlet arrangement direction of each second steam pipe outlet can enable the steam from each second steam pipe outlet to form a clockwise or counterclockwise stirring airflow in the box.

4. The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system according to claim 3 is characterized in that: The second steam pipe is a spiral coil.

5. The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system according to claim 4 is characterized in that: There are four second steam pipe outlets, and adjacent second steam pipe outlets are vertically arranged.

6. The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system according to claim 1, characterized in that: The gas phase outlet of the gas-liquid separation tank is provided with a first branch and a second branch, the first branch is communicated with the first steam pipe of the air-temperature vaporizer, and the second branch is communicated with the water bath heating box.

7. The supercritical water oxidation high-temperature steam waste heat comprehensive recycling system according to claim 6, characterized in that: The first steam pipe is provided with a first steam pipe inlet and a first steam pipe outlet, and the first steam pipe outlet is communicated with a bottom steam coil arranged at the bottom of the air-temperature evaporator for collecting condensed water.

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