Microchannel reactor-based persulfate oxidation device

Abstract

The utility model discloses a persulfate oxidation device based on a micro-channel reactor, which belongs to the technical field of wastewater treatment and comprises a persulfate dissolving tank for preparing a persulfate aqueous solution, a persulfate delivery pump, the micro-channel reactor, a steam heater, a wastewater tank, a wastewater delivery pump and a heat exchanger, the outlet end of the persulfate dissolving tank is communicated with the inlet end of the persulfate delivery pump, the outlet end of the persulfate delivery pump is communicated with the oxidant inlet end of the microchannel reactor, and the outlet end of the wastewater tank is communicated with the inlet end of the wastewater delivery pump. The persulfate oxidation device is provided with the micro-channel reactor, the contact area between persulfate and wastewater can be greatly increased and the reaction rate can be increased due to the small size and the large specific surface area of the micro-channel reactor, so that the efficiency of the whole oxidation process is improved, and the reaction is rapid, efficient and thorough.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a persulfate oxidation device based on a microchannel reactor. Background Art

[0002] With the rapid development of industrialization, high-concentration refractory organic wastewater has become an important challenge in the current wastewater treatment field due to its special properties, such as low biodegradability, high difficulty in treatment, limited treatment effect and serious threat to the environment. Traditional biodegradation wastewater treatment methods often fail to achieve ideal results for such wastewater. Therefore, advanced oxidation technology has gradually become an effective means to treat such wastewater.

[0003] However, the currently used advanced oxidation technologies such as Fenton or ozone catalytic oxidation can remove part of the chemical oxygen demand (COD), but they have the disadvantages of high treatment cost, high energy consumption, and unstable treatment effect. For example, the Fenton reaction consumes a large amount of ferrous ions and hydrogen peroxide, and produces a large amount of iron mud, which increases the difficulty and cost of subsequent treatment, while ozone catalytic oxidation requires high equipment and energy consumption, and the treatment effect is limited by the activity and stability of the catalyst; another wet oxidation process can effectively remove refractory organic matter and reduce wastewater COD, but it has the disadvantages of high equipment investment cost, harsh operating conditions (high temperature and high pressure), and great safety hazards, which limit its promotion in practical applications; in this case, electrochemical oxidation technology has shown broad application prospects in the field of wastewater treatment due to its characteristics of no need to add additional agents and good treatment effect. However, its high treatment cost and inadaptability to high-concentration organic matter still limit its application in treating high-concentration refractory organic wastewater.

[0004] Therefore, a persulfate oxidation device based on a microchannel reactor is needed to solve the above problems. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The utility model provides a persulfate oxidation device based on a microchannel reactor, aiming to solve the problems raised in the background technology.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a persulfate oxidation device based on a microchannel reactor, comprising a persulfate dissolving tank for configuring a persulfate aqueous solution, a persulfate delivery pump, a microchannel reactor, a steam heater, a wastewater tank, a wastewater delivery pump and a heat exchanger; a persulfate aqueous solution is configured by setting a persulfate dissolving tank, and sulfate is used as an oxidant. Under the action of thermal activation, it can generate free radicals with oxidizing ability to react with organic matter in the wastewater to achieve the effect of removing organic matter. At the same time, the design of the microchannel reactor, its small size and large specific surface area can greatly increase the contact area between persulfate and wastewater, accelerate the reaction rate, thereby improving the efficiency of the entire oxidation process, and making the reaction fast, efficient and thorough.

[0009] In order to ensure the automation and continuity of the process, the outlet end of the persulfate dissolution tank is connected to the inlet end of the persulfate delivery pump, the outlet end of the persulfate delivery pump is connected to the oxidant inlet end of the microchannel reactor, the outlet end of the wastewater tank is connected to the inlet end of the wastewater delivery pump, the outlet end of the wastewater delivery pump is connected to the wastewater inlet end of the heat exchanger, the wastewater outlet end of the heat exchanger is connected to the inlet end of the steam heater, and the outlet end of the steam heater is connected to the wastewater inlet end of the microchannel reactor; the components such as the persulfate dissolution tank, the persulfate delivery pump, the heat exchanger, the steam heater and the microchannel reactor are connected to form a continuous and automated processing flow, so that wastewater and persulfate aqueous solution can continuously and automatically enter the microchannel reactor for reaction and treatment, which not only improves the efficiency of wastewater treatment, but also reduces the dependence on manual operation, and reduces the difficulty and error rate of operation.

[0010] In order to recover and utilize heat energy, the oxidized wastewater outlet of the microchannel reactor is connected to the oxidized water inlet of the heat exchanger; the oxidized wastewater treated by the microchannel reactor is directly introduced into the heat exchanger, which can efficiently recover heat energy for preheating the wastewater to be treated, thereby reducing the energy consumption of the entire wastewater treatment process.

[0011] Preferably, in order to enhance the heat transfer and mass transfer effects, the microchannel reactor includes a symmetrically arranged lower cover plate and an upper cover plate and a plurality of microchannel guide plates stacked between the lower cover plate and the upper cover plate and interconnected; the stacked design of the microchannel guide plates forms a plurality of tiny channels inside the microchannel reactor, which can greatly increase the specific surface area of ​​the microchannel reactor, thereby facilitating efficient heat transfer and mass transfer, so that the wastewater and the persulfate aqueous solution can quickly reach a uniform temperature distribution in the microchannel reactor and be fully mixed, thereby improving the reaction efficiency and product quality.

[0012] Preferably, for the convenience of assembly and disassembly, the microchannel reactor also includes screws respectively arranged at the corners around the lower cover plate and the upper cover plate, and nuts respectively screwed on both ends of the screws; through the screw connection of the screws and the nuts, the lower cover plate, the upper cover plate and the stacked microchannel guide plates can be easily and quickly assembled together, and when it is necessary to clean, maintain or replace internal components, the microchannel reactor can be easily disassembled by loosening the nuts.

[0013] Preferably, in order to facilitate efficient mixing and reaction, the microchannel guide plate includes a substrate, a microchannel guide groove opened on the substrate, an oxidant water inlet hole and a wastewater water inlet hole arranged on the substrate and respectively connected to the inlet end of the microchannel guide groove, and an oxidized wastewater water outlet hole arranged on the substrate and connected to the outlet end of the microchannel guide groove, the oxidant water inlet hole, the wastewater water inlet hole and the oxidized wastewater water outlet hole are respectively connected to the outlet end of the persulfate delivery pump, the outlet end of the steam heater and the oxidized water inlet end of the heat exchanger; the design of the microchannel guide groove enables the persulfate aqueous solution and the wastewater to be rapidly mixed at a microscale, and this mixing method greatly increases the contact area between the reactants and shortens the diffusion distance, thereby achieving an efficient reaction rate.

[0014] Preferably, in order to ensure the completeness and efficiency of the reaction, the microchannel guide grooves are distributed in the form of S-shaped reciprocating bends; due to the design of the S-shaped reciprocating bends, the flow paths of the persulfate solution and the wastewater in the microchannel guide grooves are extended, which is conducive to fully completing the reaction process.

[0015] Preferably, for efficient heat and mass transfer, the depth of the microchannel guide groove is 300-800 microns; the depth range of 300-800 microns ensures that the microchannel guide groove has sufficient surface area, so that the persulfate aqueous solution and wastewater can quickly reach a uniform temperature distribution and be fully mixed in the microchannel guide groove. At the same time, this depth range helps to reduce the flow rate of the persulfate aqueous solution and wastewater in the microchannel guide groove, thereby reducing pressure loss, maintaining the stability of the pressure in the microchannel reactor, and reducing the impact of pressure fluctuations on the reaction process.

[0016] (III) Beneficial effects

[0017] The persulfate oxidation device is provided with a persulfate dissolving tank to prepare a persulfate aqueous solution, and uses sulfate as an oxidant. Under the action of thermal activation, it can generate free radicals with oxidizing ability to react with organic matter in the wastewater, thereby achieving the effect of removing organic matter;

[0018] The persulfate oxidation device is provided with a microchannel reactor, whose small size and large specific surface area can greatly increase the contact area between persulfate and wastewater, accelerate the reaction rate, thereby improving the efficiency of the entire oxidation process, making the reaction fast, efficient and thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the process structure of a persulfate oxidation device based on a microchannel reactor;

[0020] Figure 2 It is a schematic structural diagram of a microchannel reactor in a persulfate oxidation device based on a microchannel reactor;

[0021] Figure 3 It is a schematic diagram of the structure of a microchannel guide groove in a persulfate oxidation device based on a microchannel reactor.

[0022] In the figure:

[0023] 1. Persulfate dissolution tank;

[0024] 2. Persulfate delivery pump;

[0025] 3. Microchannel reactor; 31. Lower cover plate; 32. Microchannel guide plate; 321. Oxidant water inlet hole; 322. Wastewater water inlet hole; 323. Microchannel guide groove; 324. Substrate; 325. Oxidized wastewater outlet hole; 33. Screw; 34. Nut; 35. Upper cover plate;

[0026] 4. Steam heater;

[0027] 5. Wastewater tank;

[0028] 6. Wastewater delivery pump;

[0029] 7. Heat exchanger. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The utility model provides a persulfate oxidation device based on a microchannel reactor, such as Figure 1-Figure 3As shown, the persulfate oxidation device includes a persulfate dissolution tank 1 for configuring a persulfate aqueous solution, a persulfate delivery pump 2, a microchannel reactor 3, a steam heater 4, a wastewater tank 5, a wastewater delivery pump 6 and a heat exchanger 7; the outlet end of the persulfate dissolution tank 1 is connected to the inlet end of the persulfate delivery pump 2, the outlet end of the persulfate delivery pump 2 is connected to the oxidant inlet end of the microchannel reactor 3, the outlet end of the wastewater tank 5 is connected to the inlet end of the wastewater delivery pump 6, the outlet end of the wastewater delivery pump 6 is connected to the wastewater inlet end of the heat exchanger 7, the wastewater outlet end of the heat exchanger 7 is connected to the inlet end of the steam heater 4, and the outlet end of the steam heater 4 is connected to the wastewater inlet end of the microchannel reactor 3; the oxidized wastewater outlet end of the microchannel reactor 3 is connected to the oxidized water inlet end of the heat exchanger 7.

[0032] When in use, persulfate is added to the persulfate dissolving tank 1, and an appropriate amount of water is added to dissolve it to prepare the required persulfate aqueous solution. At the same time, wastewater is stored in the wastewater tank 5. After the persulfate aqueous solution is prepared, the persulfate delivery pump 2 is started to transport the persulfate aqueous solution from the persulfate dissolving tank 1 to the oxidant inlet end of the microchannel reactor 3. At the same time, the wastewater delivery pump 6 is started to transport the wastewater from the wastewater tank 5 to the wastewater inlet end of the heat exchanger 7. After the wastewater enters the heat exchanger 7, the heat exchanger 7 is used to perform heat exchange with the oxidized wastewater discharged from the microchannel reactor 3, so that the wastewater entering the heat exchanger 7 from the wastewater tank 5 is preliminarily preheated. Then, the wastewater preheated by heat exchange subsequently enters the steam heater 4. The wastewater is heated to the optimum reaction temperature through further adjustment of steam heating by the steam heater 4. Subsequently, the wastewater heated to the optimum reaction temperature enters the wastewater inlet of the microchannel reactor 3, and is mixed with the persulfate solution entering the microchannel reactor 3 in the microchannel reactor 3 and undergoes an oxidation reaction to degrade organic pollutants in the wastewater. Afterwards, the oxidized wastewater after the reaction is completed is discharged from the oxidized wastewater outlet of the microchannel reactor 3, and then enters the oxidized water inlet of the heat exchanger 7. The oxidized wastewater entering the heat exchanger 7 is heat exchanged with the wastewater entering from the wastewater tank 5 to recover heat. The temperature of the oxidized wastewater after heat recovery is reduced, and finally the wastewater is discharged and recovered through the oxidized water outlet of the heat exchanger 7.

[0033] Specifically, the microchannel reactor 3 includes a lower cover plate 31 and an upper cover plate 35 which are symmetrically arranged, and a plurality of microchannel guide plates 32 which are stacked and connected to each other between the lower cover plate 31 and the upper cover plate 35. The microchannel reactor 3 also includes screws 33 which are respectively arranged at the corners around the lower cover plate 31 and the upper cover plate 35, and nuts 34 which are respectively screwed to both ends of the screws 33.

[0034] Since the multiple microchannel guide plates 32 are interconnected, after the persulfate delivery pump 2 and the wastewater delivery pump 6 are started, the persulfate solution configured in the persulfate dissolution tank 1 will be transported by the persulfate delivery pump 2 and flow through the stacked microchannel guide plates 32 in sequence. At the same time, the wastewater in the wastewater tank 5 will also flow through the stacked microchannel guide plates 32 in sequence and be fully mixed with the persulfate solution in the stacked microchannel guide plates 32 so that it can quickly reach a uniform temperature distribution. After using the microchannel reactor 3, the nut 34 on the corresponding screw rod 33 can be regularly disassembled to release the connection between the screw rod 33 and the lower cover plate 31 and the upper cover plate 35, so as to ensure the use effect of the microchannel guide plate 32.

[0035] Further, the microchannel guide plate 32 includes a substrate 324, a microchannel guide groove 323 provided on the substrate 324, an oxidant water inlet hole 321 and a wastewater water inlet hole 322 provided on the substrate 324 and respectively connected to the inlet end of the microchannel guide groove 323, and an oxidized wastewater water outlet hole 325 provided on the substrate 324 and connected to the outlet end of the microchannel guide groove 323, the oxidant water inlet hole 321, the wastewater water inlet hole 322 and the oxidized wastewater water outlet hole 325 are respectively connected to the outlet end of the persulfate delivery pump 2, the outlet end of the steam heater 4 and the oxidized water inlet end of the heat exchanger 7;

[0036] When the persulfate delivery pump 2 is started to deliver the persulfate solution in the persulfate dissolution tank 1 to the microchannel reactor 3, it will directly enter the microchannel guide groove 323 through the oxidant water inlet hole 321 set on the substrate 324. At the same time, when the wastewater delivery pump 6 is started to deliver the wastewater in the wastewater tank 5 to the microchannel reactor 3, it will directly enter the microchannel guide groove 323 through the wastewater water inlet hole 322 set on the substrate 324, and the persulfate solution entering the microchannel guide groove 323 is fully mixed to perform an oxidation reaction, thereby effectively removing organic matter in the wastewater. When the oxidized wastewater is discharged through the oxidized wastewater outlet hole 325 set on the substrate 324, it enters the heat exchanger 7 for heat exchange treatment.

[0037] Among them, in order to ensure the completeness and efficiency of the reaction, the microchannel guide groove 323 is distributed in the form of an S-shaped reciprocating bend; due to the design of the S-shaped reciprocating bend, the flow path of the persulfate solution and the wastewater in the microchannel guide groove 323 is extended, which is conducive to fully completing the reaction process.

[0038] In addition, for efficient heat and mass transfer, the depth of the microchannel guide groove 323 is 300-800 microns; the depth range of 300-800 microns ensures that the microchannel guide groove 323 has sufficient surface area, so that the persulfate aqueous solution and wastewater can quickly reach a uniform temperature distribution and be fully mixed in the microchannel guide groove 323. At the same time, this depth range helps to reduce the flow rate of the persulfate aqueous solution and wastewater in the microchannel guide groove 323, thereby reducing pressure loss, maintaining the stability of the pressure in the microchannel reactor 3, and reducing the impact of pressure fluctuations on the reaction process.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A persulfate oxidation device based on a microchannel reactor, characterized in that: It comprises a persulfate dissolving tank (1), a persulfate delivery pump (2), a microchannel reactor (3), a steam heater (4), a wastewater tank (5), a wastewater delivery pump (6) and a heat exchanger (7); The outlet end of the persulfate dissolution tank (1) is communicated with the inlet end of the persulfate delivery pump (2), the outlet end of the persulfate delivery pump (2) is communicated with the oxidant inlet end of the microchannel reactor (3), the outlet end of the wastewater tank (5) is communicated with the inlet end of the wastewater delivery pump (6), the outlet end of the wastewater delivery pump (6) is communicated with the wastewater inlet end of the heat exchanger (7), the wastewater outlet end of the heat exchanger (7) is communicated with the inlet end of the steam heater (4), and the outlet end of the steam heater (4) is communicated with the wastewater inlet end of the microchannel reactor (3); The oxidation wastewater outlet of the microchannel reactor (3) is in communication with the oxidation water inlet of the heat exchanger (7).

2. A persulfate oxidation device based on a microchannel reactor according to claim 1, characterized in that: The microchannel reactor (3) comprises a lower cover plate (31) and an upper cover plate (35) which are symmetrically arranged, and a plurality of microchannel guide plates (32) which are stacked between the lower cover plate (31) and the upper cover plate (35) and are interconnected.

3. A persulfate oxidation device based on a microchannel reactor according to claim 2, characterized in that: The microchannel reactor (3) further comprises screw rods (33) respectively arranged at the corners around the lower cover plate (31) and the upper cover plate (35), and nuts (34) respectively screwed to the two ends of the screw rods (33).

4. A persulfate oxidation device based on a microchannel reactor according to claim 2, characterized in that: The microchannel guide plate (32) comprises a substrate (324), a microchannel guide groove (323) provided on the substrate (324), an oxidant water inlet hole (321) and a wastewater water inlet hole (322) provided on the substrate (324) and respectively connected to the inlet end of the microchannel guide groove (323), and an oxidized wastewater water outlet hole (325) provided on the substrate (324) and connected to the outlet end of the microchannel guide groove (323); the oxidant water inlet hole (321), the wastewater water inlet hole (322) and the oxidized wastewater water outlet hole (325) are respectively connected to the outlet end of the persulfate delivery pump (2), the outlet end of the steam heater (4) and the oxidized water inlet end of the heat exchanger (7).

5. A persulfate oxidation device based on a microchannel reactor according to claim 4, characterized in that: The microchannel guide grooves (323) are distributed in the form of S-shaped reciprocating bends.

6. A persulfate oxidation device based on a microchannel reactor according to claim 4, characterized in that: The depth of the microchannel guide groove (323) is 300-800 microns.

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