Wet oxidation treatment system for sludge

Abstract

The utility model provides a wet oxidation treatment system for sludge. The wet oxidation treatment system for the sludge comprises a mixing tank, a heat exchange device, a reactor, a gas-liquid separator and a reflux device, the mixing tank, the heat exchange device, the reactor and the gas-liquid separator are sequentially connected through pipelines, and the backflow device is connected between the gas-liquid separator and the mixing tank and used for enabling part of products to flow back into the mixing tank; high-pressure gas is introduced into the heat exchange device; a partition plate and a cleaning device are arranged; the reactor outlet is provided with a self-control valve. The sludge concentration of the mixing tank is reduced through sludge backflow; high-pressure gas is introduced through the heat exchanger to enhance sludge stirring, a partition plate is arranged through the heat exchanger to increase the sludge flowing speed, and accumulated sludge is cleaned by arranging a cleaning device; and the system pressure is stabilized through the self-control valve. The measures can effectively improve the fluidity of the sludge, avoid sludge deposition and improve the heat exchange effect, the sludge treatment effect is good, meanwhile, the system is stable in operation, and the operation cycle is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of sludge treatment, and particularly relates to a wet oxidation treatment system for sludge. Background Art

[0002] Wet oxidation of sludge refers to the treatment of sludge by using the wet oxidation method. Usually, air or oxygen is introduced as an oxidant under high temperature and high pressure conditions to oxidize and decompose the organic matter in the sludge. During the wet oxidation process of sludge, the sludge structure and composition are changed, and the dewatering performance is relatively high. In related technologies, after the sludge is mixed with air, it first enters a heat exchanger for heat exchange, then is fed into a reactor for oxidation reaction, and finally enters a gas-liquid separator for separation of water and mud. However, in the traditional continuous-flow wet oxidation process of sludge, due to the relatively high viscosity of the sludge and the reduction of the space flow velocity in the shell side of the heat exchanger, the sludge is likely to deposit in the heat exchanger, resulting in a decrease in heat exchange efficiency and poor treatment effect; moreover, the sludge contains impurities that are likely to block the pipeline, and the traditional process lacks necessary cleaning devices, leading to difficulties in the subsequent system recovery; at the same time, due to the relatively high system pressure, it can generally only be controlled by fixed valves, resulting in serious wear of the valves and large fluctuations in the system pressure, affecting the stability of the system. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related technologies to some extent. For this purpose, an embodiment of the utility model provides a wet oxidation treatment system for sludge. In this wet oxidation treatment system for sludge, the fluidity of the sludge is relatively high, so that sludge deposition can be avoided, and it has a good treatment effect. Moreover, the system energy can be recovered, heat energy loss can be reduced, and at the same time, the stability of the system pressure and the rapid recovery operation when the system is blocked or silted are realized.

[0004] The wet oxidation treatment system for sludge in the embodiment of the utility model includes a mixing tank, a heat exchange device, a reactor, a gas-liquid separator, a reflux device and a high-pressure gas inlet. The mixing tank, the heat exchange device, the reactor and the gas-liquid separator are sequentially connected through pipelines. The reflux device is connected between the gas-liquid separator and the mixing tank for part of the products of the gas-liquid separator to flow back into the mixing tank. The pipeline connecting the mixing tank and the heat exchange device is provided with the high-pressure gas inlet.

[0005] In the sludge wet oxidation treatment system according to the embodiment of the present utility model, part of the products of the gas-liquid separator are refluxed into the mixing tank through a reflux device, and the sludge and the refluxed products are mixed through the mixing tank to reduce the concentration of the sludge discharged from the mixing tank, thereby improving the fluidity of the sludge. At the same time, the heat energy of the system is recycled, and the temperature of the sludge discharged from the mixing tank is increased. High-pressure air or high-pressure oxygen is provided through the high-pressure gas inlet, so that the high-pressure air or high-pressure oxygen is mixed with the sludge discharged from the mixing tank in the pipeline to further stir the sludge and improve the fluidity and heat exchange effect of the mixed sludge. Therefore, sludge deposition can be avoided, and the sludge has a better reaction effect, so that the sludge wet oxidation treatment system has better treatment efficiency and treatment effect, improves the degree of sludge reduction, and has lower energy consumption.

[0006] In some embodiments, the reflux device includes a first reflux pipe, and the first reflux pipe is connected between the liquid outlet of the gas-liquid separator and the mixing tank.

[0007] In some embodiments, the reflux device includes a second reflux pipe, and the second reflux pipe is connected between the gas outlet of the gas-liquid separator and the mixing tank.

[0008] In some embodiments, the mixing tank includes a tank body and a stirrer. At least part of the stirrer is located inside the tank body. The outlet end of the second reflux pipe is located inside the tank body and is arranged between the stirrer and the bottom of the tank body. The outlet end of the second reflux pipe extends horizontally and has a plurality of reflux outlets arranged at intervals along the extending direction of the second reflux pipe.

[0009] In some embodiments, the heat exchange device includes a first heat exchanger and a second heat exchanger. Both the first heat exchanger and the second heat exchanger include a shell-side space and a tube-side space. The mixing tank, the tube-side space of the first heat exchanger, the tube-side space of the second heat exchanger, and the reactor are connected in sequence;

[0010] The sludge wet oxidation treatment system further includes a heat-conducting oil heater and a third reflux pipe. The heat-conducting oil heater is respectively connected to the outlet and the inlet of the shell-side space of the second heat exchanger. The third reflux pipe is connected between the outlet of the reactor and the inlet of the shell-side space of the first heat exchanger. The outlet of the shell-side space of the first heat exchanger is connected to the inlet of the gas-liquid separator.

[0011] In some embodiments, the first heat exchanger includes a heat exchanger body and a partition plate. The heat exchanger body is provided with the shell-side space and the tube-side space. A plurality of partition plates arranged at intervals in the horizontal direction are provided in the shell-side space of the heat exchanger body. Each partition plate extends in the vertical direction, and the plurality of partition plates form a quasi-S-shaped flow channel. One end of the quasi-S-shaped flow channel is provided with an inlet of the shell-side space, and the other end of the quasi-S-shaped flow channel is provided with an outlet of the shell-side space.

[0012] In some embodiments, the first heat exchanger further includes a cleaning nozzle. At least a part of the cleaning nozzle is vertically arranged in the shell-side space. There are a plurality of the cleaning nozzles. A corresponding cleaning nozzle is provided between adjacent two partition plates, and a corresponding cleaning nozzle is also provided between the vertical wall surface of the heat exchanger body and the adjacent partition plate. The cleaning nozzle has a plurality of spray heads arranged at intervals in the vertical direction.

[0013] In some embodiments, the sludge wet oxidation treatment system further includes a controller, a pressure control valve, and a pressure sensor. The pressure sensor is connected to the reactor to obtain the pressure inside the reactor. The pressure control valve is arranged on the pipeline connecting the inlet of the gas-liquid separator, and the pressure sensor and the pressure control valve are respectively electrically connected to the controller, so that the controller adjusts the opening degree of the pressure control valve according to the pressure obtained by the pressure sensor.

[0014] In some embodiments, the sludge wet oxidation treatment system further includes a feed pump and a dehydration device. The liquid outlet of the gas-liquid separator, the feed pump, and the dehydration device are sequentially connected through pipelines. The inlet end of the first return pipe is provided on the pipeline connecting the feed pump and the dehydration device.

[0015] In some embodiments, the sludge wet oxidation treatment system further includes a sludge pump. The sludge pump is arranged on the pipeline connecting the mixing tank and the heat exchange device, and the high-pressure gas inlet is located between the sludge pump and the heat exchange device. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the sludge wet oxidation treatment system according to an embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of the first heat exchanger in an embodiment of the present invention;

[0018] Figure 3 is Figure 2 the sectional view taken along the line A-A of the first heat exchanger in

[0019] Reference Numerals:

[0020] 1. Mixing tank; 11. Tank body; 12. Stirrer; 2. Heat exchange device; 21. First heat exchanger; 211. Heat exchanger body; 2111. Shell; 21112. Heat exchange tubes; 212. Baffle; 213. Cleaning spray pipe; 22. Second heat exchanger; 3. Reactor; 4. Gas-liquid separator; 5. Return device; 51. First return pipe; 52. Second return pipe; 6. Heat-conducting oil heater; 7. Third return pipe; 8. Pressure control valve; 9. Feed pump; 10. Dewatering device; 20. Sludge pump; 30. High-pressure gas inlet. Detailed implementation manners

[0021] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0022] Reference will be made below Figures 1 - 3 to describe the sludge wet oxidation treatment system according to the embodiments of the present utility model.

[0023] As Figures 1 - 3 shown, the sludge wet oxidation treatment system according to the embodiments of the present utility model includes a mixing tank 1, a heat exchange device 2, a reactor 3, a gas-liquid separator 4, a return device 5, and a high-pressure gas inlet 30.

[0024] The mixing tank 1, the heat exchange device 2, the reactor 3, and the gas-liquid separator 4 are connected in sequence through pipelines. The return device 5 is connected between the gas-liquid separator 4 and the mixing tank 1 for part of the products of the gas-liquid separator 4 to flow back into the mixing tank 1. A high-pressure gas inlet 30 is provided on the pipeline connecting the mixing tank 1 and the heat exchange device 2.

[0025] Specifically, as Figure 1 shown, the mixing tank 1, the heat exchange device 2, the reactor 3, and the gas-liquid separator 4 are connected in sequence through pipelines. The raw sludge is first mixed evenly in the mixing tank 1, then enters the heat exchange device 2 to be heated and raised in temperature, then enters the reactor 3 for oxidation reaction, and after the reaction, enters the gas-liquid separator 4 for gas-liquid separation. The return device 5 is connected between the gas-liquid separator 4 and the mixing tank 1 for part of the products of the gas-liquid separator 4 to flow back into the mixing tank 1. The returned products are mixed evenly with the raw sludge in the mixing tank 1 to dilute the raw sludge and increase the temperature of the raw sludge through the temperature of the returned products. The reactor 3 is preferably a catalytic oxidation reactor, and the gas-liquid separator 4 is preferably a decompression gas-liquid separator.

[0026] The pipeline connecting the mixing tank 1 and the heat exchange device 2 is provided with a high-pressure gas inlet 30. High-pressure air or high-pressure oxygen is provided through the high-pressure gas inlet 30, so that the high-pressure air or high-pressure oxygen is mixed with the mixed sludge discharged from the mixing tank 1 in the pipeline, so as to further stir the mixed sludge, improve the fluidity and heat exchange effect of the mixed sludge, avoid sludge deposition, and at the same time, the high-pressure air or high-pressure oxygen serves as an oxidant for the oxidation reaction of the mixed sludge, and makes the mixed sludge start to undergo an oxidation reaction when entering the heat exchange device 2, improving the oxidation reaction time and reaction effect of the mixed sludge.

[0027] The high-pressure gas inlet 30 is preferably the outlet of a high-pressure air compressor or is connected to the outlet of a high-pressure air compressor through a pipeline.

[0028] In the sludge wet oxidation treatment system of the embodiment of the present invention, part of the product of the gas-liquid separator is refluxed into the mixing tank through a reflux device, and the sludge and the refluxed product are mixed through the mixing tank. On the one hand, it can reduce the concentration of the sludge discharged from the mixing tank, thereby improving the fluidity of the sludge. On the other hand, it can recover the heat energy of the system and increase the temperature of the sludge discharged from the mixing tank. High-pressure air or high-pressure oxygen is provided through the high-pressure gas inlet, so that the high-pressure air or high-pressure oxygen is mixed with the sludge discharged from the mixing tank in the pipeline to further stir the sludge and improve the fluidity and heat exchange effect of the mixed sludge. Therefore, sludge deposition can be avoided, and the sludge can have a better reaction effect in the subsequent process. Thus, the sludge wet oxidation treatment system has better treatment efficiency and treatment effect, and improves the degree of sludge reduction. At the same time, the sludge in the mixing tank is heated up by the temperature of the refluxed product, so the energy consumption of the sludge wet oxidation treatment system will not be increased and the energy consumption is low.

[0029] In some embodiments, the reflux device 5 includes a first reflux pipe 51, and the first reflux pipe 51 is connected between the liquid outlet of the gas-liquid separator 4 and the mixing tank 1.

[0030] As Figure 1 shown, the reflux device 5 includes a first reflux pipe 51, and the first reflux pipe 51 is connected between the liquid outlet of the gas-liquid separator 4 and the mixing tank 1 to reflux part of the liquid product generated by the gas-liquid separator 4 into the mixing tank 1. The refluxed part of the liquid product is fully mixed with the raw sludge in the mixing tank 1, so as to dilute the raw sludge, improve the fluidity of the sludge discharged from the mixing tank 1, and avoid sludge deposition. At the same time, because the refluxed part of the liquid product has a certain temperature, it can also increase the temperature of the raw sludge.

[0031] It should be noted that the liquid product is a mud-water mixture, which includes an oxidation liquid and the remaining sludge after the reaction.

[0032] In some embodiments, the reflux device 5 includes a second reflux pipe 52, and the second reflux pipe 52 is connected between the gas outlet of the gas-liquid separator 4 and the mixing tank 1.

[0033] As Figure 1 shown, the reflux device 5 includes a second reflux pipe 52, and the second reflux pipe 52 is connected between the gas outlet of the gas-liquid separator 4 and the mixing tank 1 to reflux the gas product generated by the gas-liquid separator 4 into the mixing tank 1. The refluxed gas product stirs the raw sludge in the mixing tank 1 to improve the fluidity of the sludge discharged from the mixing tank 1 and avoid sludge deposition. At the same time, since the refluxed gas product has a certain temperature, it can also increase the temperature of the raw sludge and realize the recovery and utilization of the system heat energy.

[0034] It can be understood that the first reflux pipe and the second reflux pipe are not limited to being provided simultaneously. In some other embodiments, one of the first reflux pipe and the second reflux pipe can be provided.

[0035] In some embodiments, the mixing tank 1 includes a tank body 11 and a stirrer 12. At least part of the stirrer 12 is located inside the tank body 11. The outlet end of the second reflux pipe 52 is located inside the tank body 11 and is arranged between the stirrer 12 and the bottom of the tank body 11. The outlet end of the second reflux pipe 52 extends horizontally and has a plurality of reflux outlets 521 arranged at intervals along the extending direction of the second reflux pipe 52.

[0036] As Figure 1 shown, the mixing tank 1 is preferably a stirring batching tank, which includes a tank body 11 and a stirrer 12. The stirrer 12 penetrates through the top of the tank body 11. The upper end of the stirrer 12 has a driver, and the lower end of the stirrer 12 has a stirring paddle located inside the tank body 11. The stirring paddle is driven by the driver to rotate around the vertical direction to stir and mix the raw sludge, the refluxed part of the liquid product and the refluxed gas product located inside the tank body 11.

[0037] The outlet end of the second reflux pipe 52 is located inside the tank body 11 and is arranged between the stirrer 12 and the bottom of the tank body 11. The outlet end of the second reflux pipe 52 extends horizontally, which can be specifically linear, grid-shaped or spiral-shaped. The outlet end of the second reflux pipe 52 has a plurality of reflux outlets 521 arranged at intervals along the extending direction of the second reflux pipe 52. The gas product refluxed by the second reflux pipe 52 is discharged from the plurality of reflux outlets 521 and enters the raw sludge. The gas product flows upward in the raw sludge and is fully mixed with the raw sludge under the stirring of the stirring paddle.

[0038] Preferably, there are two mixing tanks 1 in parallel. One is used to add ingredients such as water, acid, and scale inhibitor to prepare raw sludge, and the other is used to supply the mixed sludge to the heat exchange device 2, and the two mixing tanks 1 supply alternately.

[0039] In some embodiments, the heat exchange device 2 includes a first heat exchanger 21 and a second heat exchanger 22. Both the first heat exchanger 21 and the second heat exchanger 22 include a shell-side space and a tube-side space. The mixing tank 1, the tube-side space of the first heat exchanger 21, the tube-side space of the second heat exchanger 22, and the reactor 3 are connected in sequence.

[0040] Specifically, as Figure 1 shown, the heat exchange device 2 includes a first heat exchanger 21 and a second heat exchanger 22. Both the first heat exchanger 21 and the second heat exchanger 22 include a shell-side space and a tube-side space. In the same heat exchanger, the medium in the shell-side space and the medium in the tube-side space can conduct heat exchange. The mixing tank 1, the tube-side space of the first heat exchanger 21, the tube-side space of the second heat exchanger 22, and the reactor 3 are connected in sequence. After the mixed sludge is discharged from the mixing tank 1, it passes through the tube-side space of the first heat exchanger 21 and the tube-side space of the second heat exchanger 22 in sequence, and absorbs heat through heat exchange to increase the temperature of the mixed sludge, and then enters the reactor 3 for oxidation reaction.

[0041] The sludge wet oxidation treatment system of the embodiment of the present utility model further includes a heat transfer oil heater 6 and a third return pipe 7. The heat transfer oil heater 6 is respectively connected to the outlet and the inlet of the shell-side space of the second heat exchanger 22. The third return pipe 7 is connected between the outlet of the reactor 3 and the inlet of the shell-side space of the first heat exchanger 21. The outlet of the shell-side space of the first heat exchanger 21 is connected to the inlet of the gas-liquid separator 4.

[0042] Specifically, as Figure 1 shown, the inlet of the shell-side space of the first heat exchanger 21 is connected to the outlet of the reactor 3 through the third return pipe 7. The outlet of the shell-side space of the first heat exchanger 21 is connected to the inlet of the gas-liquid separator 4 through a pipeline. The sludge after the oxidation reaction has a relatively high temperature. The sludge after the oxidation reaction is supplied into the shell-side space of the first heat exchanger 21 through the third return pipe 7, so that the mixed sludge in the tube-side space of the first heat exchanger 21 is heated up, and the sludge after the oxidation reaction is cooled down. Then the sludge after the oxidation reaction is supplied into the gas-liquid separator 4. Through the first heat exchanger 21, the temperature of the mixed sludge is increased and the sludge after the oxidation reaction is cooled down, which is convenient for the subsequent oxidation reaction of the mixed sludge and the gas-liquid separation of the sludge after the oxidation reaction, and no additional energy is consumed.

[0043] The outlet and the inlet of the shell-side space of the second heat exchanger 22 are respectively connected to the heat transfer oil heater 6, so that a circulation flow path for the heat transfer oil is formed between the shell-side space of the second heat exchanger 22 and the heat transfer oil heater 6. The heat transfer oil heated by the heat transfer oil heater 6 further heats up the mixed sludge in the tube-side space of the second heat exchanger 22.

[0044] The mixed sludge is heated successively by the first heat exchanger 21 and the second heat exchanger 22 to ensure that the mixed sludge has a relatively high temperature, facilitating the subsequent oxidation reaction.

[0045] In some embodiments, there are multiple first heat exchangers 21, preferably three. The tube-side spaces of the multiple first heat exchangers 21 are connected in sequence. The mixed sludge discharged from the mixing tank 1 passes through the tube-side spaces of the multiple first heat exchangers 21 in sequence and then enters the tube-side space of the second heat exchanger 22. At the same time, the shell-side spaces of the multiple first heat exchangers 21 are also connected in sequence. The sludge after the oxidation reaction discharged from the reactor 3 passes through the shell-side spaces of the multiple first heat exchangers 21 in turn along the reverse direction of the flow direction of the mixed sludge and then enters the gas-liquid separator 4.

[0046] Along the flow direction of the mixed sludge, the inlet of the tube-side space of the first heat exchanger 21 at the head end among the multiple first heat exchangers 21 is connected to the mixing tank 1, the outlet of the tube-side space is connected to the tube-side spaces of other first heat exchangers 21, the outlet of the shell-side space is connected to the inlet of the gas-liquid separator 4, and the inlet of the shell-side space is connected to the shell-side spaces of other first heat exchangers 21.

[0047] Along the flow direction of the mixed sludge, the inlet of the tube-side space of the first heat exchanger 21 at the tail end among the multiple first heat exchangers 21 is connected to the tube-side spaces of other first heat exchangers 21, the outlet of the tube-side space is connected to the tube-side space of the second heat exchanger 22, the outlet of the shell-side space is connected to the shell-side spaces of other first heat exchangers 21, and the inlet of the shell-side space is connected to the outlet of the reactor 3.

[0048] Thus, the temperature of the sludge after the oxidation reaction is fully utilized by the multiple first heat exchangers 21, the temperature of the sludge after the oxidation reaction is fully reduced, and the temperature of the mixed sludge is fully increased.

[0049] In some embodiments, the first heat exchanger 21 includes a heat exchanger body 211 and a partition plate 212. The heat exchanger body 211 is provided with a shell-side space and a tube-side space. A plurality of partition plates 212 arranged at intervals in the horizontal direction are provided in the shell-side space of the heat exchanger body 211. Each partition plate 212 extends in the vertical direction. The plurality of partition plates 212 form a quasi-S-shaped flow channel. One end of the quasi-S-shaped flow channel is provided with an inlet of the shell-side space, and the other end of the quasi-S-shaped flow channel is provided with an outlet of the shell-side space.

[0050] As Figure 2 and Figure 3 shown, the first heat exchanger 21 includes a heat exchanger body 211 and a partition plate 212. The heat exchanger body 211 includes a shell 2111 and heat exchange tubes 2112. The heat exchange tubes 2112 are arranged in the shell 2111. The space between the shell 2111 and the heat exchange tubes 2112 is the shell-side space, and the inner cavity of the heat exchange tubes 2112 is the tube-side space.

[0051] In the shell-side space of the heat exchanger body 211, a plurality of partition plates 212 are provided. The partition plates 212 extend in the vertical direction. One end of each partition plate 212 in the vertical direction is connected to the housing 2111, and the other end is separated from the housing 2111. The front end and the rear end of the partition plate 212 are both connected to the housing 2111. The plurality of partition plates 212 are arranged at intervals in the left-right direction. Along the arrangement direction of the plurality of partition plates 212, the separated ends of the plurality of partition plates 212 separated from the housing 2111 are arranged alternately in the vertical direction. For example, in the left-right direction, the upper end of the first partition plate 212 is separated from the housing 2111, the lower end of the second partition plate 212 is separated from the housing 2111, and the upper end of the third partition plate 212 is separated from the housing 2111.

[0052] Thereby, a plurality of partition plates 212 form a quasi-S-shaped flow channel. In other words, the longitudinal section of the flow channel formed by the plurality of partition plates 212 is quasi-S-shaped. One end of the quasi-S-shaped flow channel is provided with an inlet of the shell-side space, and the other end of the quasi-S-shaped flow channel is provided with an outlet of the shell-side space. Preferably, the inlet of the shell-side space is located at the upper end of the housing 2111, the top of the partition plate 212 arranged opposite to the inlet of the shell-side space is connected to the housing 2111, the outlet of the shell-side space is the lower end of the housing 2111, and the bottom of the partition plate 212 arranged opposite to the outlet of the shell-side space is connected to the housing 2111. The sludge after the oxidation reaction entering the shell-side space is guided by the quasi-S-shaped flow channel to flow.

[0053] As Figure 3 described, the cross-section of the heat exchange tube 2112 is preferably quasi-S-shaped. The heat exchange tube 2112 includes a plurality of straight segments and a plurality of connecting segments. The plurality of straight segments are arranged at intervals in a direction orthogonal to the arrangement direction of the plurality of partition plates 212. In other words, the plurality of straight segments are arranged at intervals in the front-rear direction. Each straight segment extends in the left-right direction and passes through all the partition plates 212. The connecting segments are connected between adjacent two straight segments. Along the arrangement direction of the plurality of straight segments, the connecting segments are arranged alternately in the left-right direction so that the plurality of straight segments are connected in sequence.

[0054] By arranging a plurality of partition plates 212 in the shell-side space of the first heat exchanger 21, the flow cross-section of the sludge after the oxidation reaction in the shell-side space is reduced, thereby increasing the flow velocity of the sludge after the oxidation reaction and avoiding the deposition and adhesion of the sludge after the oxidation reaction in the shell-side space of the first heat exchanger 21, thereby ensuring the heat exchange efficiency of the first heat exchanger 21 and having a smaller volume.

[0055] It can be understood that the structure of the second heat exchanger may be the same as or different from that of the first heat exchanger.

[0056] It can be understood that the S-shaped flow channel is not limited to a flow channel with an S-shaped longitudinal section. In some other embodiments, the cross-section of the S-shaped flow channel is S-shaped. Specifically, the partition plate 212 extends in the vertical direction, and both the top and bottom of the partition plate 212 are connected to the housing 2111. A plurality of partition plates 212 are arranged at intervals in the left-right direction. One end of each partition plate 212 in the front-back direction is connected to the housing 2111, and the other end is separated from the housing 2111. Along the arrangement direction of the plurality of partition plates 212, the separated ends of the plurality of partition plates 212 separated from the housing 2111 are alternately arranged in the front-back direction.

[0057] In some embodiments, the first heat exchanger 21 further includes a cleaning nozzle 213. At least a part of the cleaning nozzle 213 is vertically arranged in the shell-side space. There are a plurality of cleaning nozzles 213. A corresponding cleaning nozzle 213 is arranged between two adjacent partition plates 212, and a corresponding cleaning nozzle 213 is also arranged between the vertical wall surface of the heat exchanger body 211 and the adjacent partition plate 212. The cleaning nozzle 213 has a plurality of nozzles arranged at intervals in the vertical direction.

[0058] As Figure 2 and Figure 3 As shown, the cleaning nozzle 213 penetrates into the shell-side space of the first heat exchanger 21 from the top of the housing 2111 and extends in the vertical direction in the shell-side space. The cleaning nozzle 213 has a plurality of nozzles arranged at intervals in the vertical direction, and the high-pressure cleaning medium in the cleaning nozzle 213 is ejected from the plurality of nozzles.

[0059] There are a plurality of cleaning nozzles 213. A corresponding cleaning nozzle 213 is arranged between two adjacent partition plates 212, and a corresponding cleaning nozzle 213 is also arranged between the vertical wall surface of the heat exchanger body 211 and the adjacent partition plate 212. So as to clean the partition plate 212, the outer walls of the part of the heat exchange tubes 2112 located between two adjacent partition plates 212, and the part of the heat exchange tubes 2112 located between the partition plate 212 and the vertical wall surface of the heat exchanger body 211, remove the attached sludge, and ensure the smooth flow of the sludge after the oxidation reaction and the heat exchange efficiency of the heat exchange tubes 2112.

[0060] Preferably, a corresponding cleaning nozzle 213 is arranged between two adjacent straight segments, a corresponding cleaning nozzle 213 is arranged between the vertical wall surface of the heat exchanger body 211 and the adjacent straight segment, a corresponding cleaning nozzle 213 is arranged between the vertical wall surface of the heat exchanger body 211 and the adjacent connecting segment, and a corresponding cleaning nozzle 213 is also arranged between the adjacent partition plates 212 of the connecting segment, so as to ensure that the heat exchange tubes 2112 are cleaned sufficiently.

[0061] Preferably, the tops of multiple cleaning nozzles 213 are connected to the main pipeline, and corresponding valves are provided on the main pipeline to control the opening and closing of all the cleaning nozzles 213. A corresponding valve is provided at the top of each cleaning nozzle 213 to control the opening and closing of the corresponding cleaning nozzle 213.

[0062] In some embodiments, the sludge wet oxidation treatment system of the embodiment of the present utility model further includes a controller, a pressure control valve 8 and a pressure sensor. The pressure sensor is connected to the reactor 3 to obtain the pressure inside the reactor 3. The pressure control valve 8 is arranged on the pipeline at the inlet connecting the gas-liquid separator 4. The pressure sensor and the pressure control valve 8 are respectively electrically connected to the controller, so that the controller adjusts the opening degree of the pressure control valve 8 according to the pressure obtained by the pressure sensor.

[0063] As Figure 1 shown, a pressure control valve 8 is provided on the pipeline connecting the outlet of the shell-side space of the first heat exchanger 21 to the inlet of the gas-liquid separator 4. A pressure sensor is arranged inside the reactor 3 to obtain the pressure inside the reactor 3 through the pressure sensor. The pressure control valve 8 and the pressure sensor are both electrically connected to the controller. The controller adjusts the opening degree of the pressure control valve 8 according to the pressure obtained by the pressure sensor to ensure the pressure stability of the sludge wet oxidation treatment system and avoid damage to the pressure control valve 8. The pressure control valve 8 preferably has acid and alkali resistance.

[0064] It can be understood that the pressure sensor is not limited to being arranged inside the reactor 3. In some other embodiments, the pressure sensor can also be arranged on the shell of the reactor 3 or on the pipeline connected to the reactor 3.

[0065] In some embodiments, the sludge wet oxidation treatment system of the embodiment of the present utility model further includes a feed pump 9 and a dehydration device 10. The liquid outlet of the gas-liquid separator 4, the feed pump 9 and the dehydration device 10 are sequentially connected through pipelines. The inlet end of the first return pipe 51 is provided on the pipeline connecting the feed pump 9 and the dehydration device 10.

[0066] As Figure 1 shown, the liquid outlet of the gas-liquid separator 4, the feed pump 9 and the dehydration device 10 are sequentially connected through pipelines. The inlet end of the first return pipe 51 is provided on the pipeline connecting the feed pump 9 and the dehydration device 10. The feed pump 9 is used to provide power for the liquid product discharged from the gas-liquid separator 4 to supply a part of the liquid product into the first return pipe 51 and return it to the mixing tank 1, and at the same time supply another part of the liquid product into the dehydration device 10 for dehydration treatment. Preferably, corresponding valves are provided at the inlet end of the first return pipe 51 and the inlet end of the dehydration device 10.

[0067] The dehydration device 10 is preferably a plate and frame filter press.

[0068] In some embodiments, the wet oxidation treatment system for sludge according to the embodiments of the present utility model further includes a sludge pump 20, which is arranged on the pipeline connecting the mixing tank 1 and the heat exchange device 2, and the high-pressure gas inlet 30 is located between the sludge pump 20 and the heat exchange device 2.

[0069] As Figure 1 shown, the mixing tank 1, the sludge pump 20 and the heat exchange device 2 are sequentially connected through pipelines. The sludge pump 20 provides power for the mixed sludge discharged from the mixing tank 1. The high-pressure gas inlet 30 is arranged on the pipeline connecting the sludge pump 20 and the heat exchange device 2. The sludge pump 20 is preferably a high-pressure screw pump.

[0070] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0071] In addition, the terms "first" and "second" are only used for distinction and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0072] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0073] In the present utility model, unless otherwise clearly specified or defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0074] In the present utility model, the terms "an embodiment", "some embodiments", "an example", "a specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0075] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. A wet oxidation treatment system for sludge, characterized in that, It includes a mixing tank (1), a heat exchange device (2), a reactor (3), a gas-liquid separator (4), a reflux device (5) and a high-pressure gas inlet (30). The mixing tank (1), the heat exchange device (2), the reactor (3) and the gas-liquid separator (4) are sequentially connected by pipelines. The reflux device (5) is connected between the gas-liquid separator (4) and the mixing tank (1) for part of the products of the gas-liquid separator (4) to reflux into the mixing tank (1). The pipeline connecting the mixing tank (1) and the heat exchange device (2) is provided with the high-pressure gas inlet (30).

2. The sludge wet oxidation treatment system according to claim 1, wherein The reflux device (5) includes a first reflux pipe (51), and the first reflux pipe (51) is connected between the liquid outlet of the gas-liquid separator (4) and the mixing tank (1).

3. The sludge wet oxidation treatment system according to claim 1, characterized in that, The reflux device (5) includes a second reflux pipe (52), and the second reflux pipe (52) is connected between the gas outlet of the gas-liquid separator (4) and the mixing tank (1).

4. The sludge wet oxidation treatment system according to claim 3, characterized in that, The mixing tank (1) includes a tank body (11) and a stirrer (12). At least part of the stirrer (12) is located inside the tank body (11). The outlet end of the second reflux pipe (52) is located inside the tank body (11) and is arranged between the stirrer (12) and the bottom of the tank body (11). The outlet end of the second reflux pipe (52) extends horizontally and has a plurality of reflux outlets (521) arranged at intervals along the extension direction of the second reflux pipe (52).

5. The sludge wet oxidation treatment system according to claim 1, characterized in that The heat exchange device (2) includes a first heat exchanger (21) and a second heat exchanger (22). Both the first heat exchanger (21) and the second heat exchanger (22) include a shell-side space and a tube-side space. The mixing tank (1), the tube-side space of the first heat exchanger (21), the tube-side space of the second heat exchanger (22) and the reactor (3) are sequentially connected and communicated; The sludge wet oxidation treatment system further includes a heat-conducting oil heater (6) and a third reflux pipe (7). The heat-conducting oil heater (6) is respectively connected and communicated with the outlet and the inlet of the shell-side space of the second heat exchanger (22). The third reflux pipe (7) is connected between the outlet of the reactor (3) and the inlet of the shell-side space of the first heat exchanger (21). The outlet of the shell-side space of the first heat exchanger (21) is connected and communicated with the inlet of the gas-liquid separator (4).

6. The sludge wet oxidation treatment system according to claim 5, wherein The first heat exchanger (21) includes a heat exchanger body (211) and a partition plate (212). The heat exchanger body (211) is provided with the shell-side space and the tube-side space. A plurality of partition plates (212) arranged at intervals along the horizontal direction are provided inside the shell-side space of the heat exchanger body (211). Each partition plate (212) extends vertically. The plurality of partition plates (212) form a quasi-S-shaped flow channel. One end of the quasi-S-shaped flow channel is provided with the inlet of the shell-side space, and the other end of the quasi-S-shaped flow channel is provided with the outlet of the shell-side space.

7. The sludge wet oxidation treatment system according to claim 6, characterized in that, The first heat exchanger (21) further includes a cleaning nozzle (213). At least a part of the cleaning nozzle (213) is vertically arranged in the shell-side space. There are a plurality of the cleaning nozzles (213). A corresponding cleaning nozzle (213) is arranged between two adjacent partitions (212). A corresponding cleaning nozzle (213) is also arranged between the vertical wall surface of the heat exchanger body (211) and the adjacent partition (212). The cleaning nozzle (213) has a plurality of nozzles arranged at intervals in the vertical direction.

8. The sludge wet oxidation treatment system according to claim 1, characterized in that It further includes a controller, a pressure control valve (8) and a pressure sensor. The pressure sensor is connected to the reactor (3) to obtain the pressure in the reactor (3). The pressure control valve (8) is arranged on the pipeline connecting the inlet of the gas-liquid separator (4). The pressure sensor and the pressure control valve (8) are respectively electrically connected to the controller, so that the controller adjusts the opening degree of the pressure control valve (8) according to the pressure obtained by the pressure sensor.

9. The sludge wet oxidation treatment system according to claim 2, wherein, It further includes a feed pump (9) and a dehydration device (10). The liquid outlet of the gas-liquid separator (4), the feed pump (9) and the dehydration device (10) are sequentially connected through pipelines. The inlet end of the first return pipe (51) is arranged on the pipeline connecting the feed pump (9) and the dehydration device (10).

10. The sludge wet oxidation treatment system according to claim 1, wherein, It further includes a sludge pump (20). The sludge pump (20) is arranged on the pipeline connecting the mixing tank (1) and the heat exchange device (2), and the high-pressure gas inlet (30) is located between the sludge pump (20) and the heat exchange device (2).

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