Heterogeneous Fenton catalytic oxidation reactor for efficient reaction
By designing the secondary dosing link of the precatalytic reactor and the main reaction tower in the heterogeneous Fenton catalytic oxidation reactor, and the internal reflux pipeline, the two-stage heterogeneous Fenton reaction is achieved, and the existing reactor is solved The problems of low reaction efficiency and high operating costs have significantly improved the efficiency of pollutant removal and the efficiency of drug use.
Patent Information
- Application Number
- CN202421084497.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The existing heterogeneous Fenton fluidized bed reactors have problems such as poor fluidization effect, uneven mixing of agents, large consumption of ferrous sulfate and hydrogen peroxide, and easy precipitation of catalysts, resulting in high operating costs and low reaction efficiency.
A highly efficient reaction heterogeneous Fenton catalytic oxidation reactor is designed, including the main reaction tower, precatalytic reactor, filling tube and reflux pipeline. By performing a first-stage heterogeneous Fenton reaction in the precatalytic reactor, and setting up a secondary dosing link and an internal reflux pipeline in the main reaction tower, two-stage heterogeneous Fenton reaction is achieved, improving reaction efficiency and drug use efficiency.
Through the two-stage heterogeneous Fenton reaction, the removal efficiency of difficult-to-degrade pollutants is greatly improved, the dosage of agents is reduced, the operating costs are effectively reduced, and the catalyst precipitation is prevented.
Smart Images
Figure CN222476318U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of heterogeneous Fenton reactors, and particularly relates to a heterogeneous Fenton catalytic oxidation reactor with high-efficiency reaction. Background Art
[0002] The traditional Fenton advanced oxidation process is to remove the difficult-to-degrade organic matter in the wastewater by reacting Fe2+ and H2O2 under strong acidic conditions (pH=3 or so). However, the traditional Fenton process has many disadvantages, such as Fe3+ is easily hydrolyzed and difficult to reduce, resulting in a large amount of iron sludge production and a narrow pH working range in the Fenton oxidation process. Heterogeneous Fenton catalytic oxidation is a traditional Fenton technology that improves the catalytic efficiency by adding Fenton catalysts, thereby further improving the reaction effect. The advantage of heterogeneous Fenton is that by loading metal ions on a solid phase carrier, the difficult-to-degrade organic pollutants and H2O2 are in contact with the solid phase catalyst to react, catalyzing H2O2 to produce OH, thereby oxidizing and degrading the organic pollutants.
[0003] The heterogeneous Fenton process can be realized in two forms: fixed bed reactor and fluidized bed reactor. The fluidized bed reactor can effectively promote the contact between the mixed liquid and the catalyst because of its internal mixed flow and vortex flow. However, the traditional heterogeneous Fenton fluidized bed reactor has the disadvantages of poor fluidization effect, uneven reagent mixing, high consumption of ferrous sulfate and hydrogen peroxide, and easy precipitation of catalyst, which makes the operating cost high and the reaction efficiency needs to be improved. Utility Model Content
[0004] The utility model aims to provide a heterogeneous Fenton catalytic oxidation reactor with high efficiency in view of the deficiencies in the prior art, so as to solve the problems of low efficiency of heterogeneous Fenton reaction, high cost of reagents for single-stage Fenton reaction and easy precipitation of catalyst.
[0005] The technical purpose of the utility model is achieved through the following technical scheme: a heterogeneous Fenton catalytic oxidation reactor with high-efficiency reaction, comprising a main reaction tower and a water inlet pipe connected to the main reaction tower, a water distributor is arranged at the bottom of the main reaction tower, two filling pipes are arranged above the water inlet pipe at the bottom of the main reaction tower, a water outlet guide is arranged at the top of the main reaction tower, a water outlet pipe is arranged on the upper part of the water outlet guide, a pre-catalytic reactor is arranged at the front end of the main reaction tower, an agitator is arranged in the pre-catalytic reactor, and a water inlet pump is arranged on the water inlet pipe between the main reaction tower and the pre-catalytic reactor; the upper end of the pre-catalytic reactor is connected to a ferrous sulfate dosing pipe and a hydrogen peroxide dosing pipe.
[0006] Preferably, a reflux pipe is provided at the top of the main reaction tower, the reflux pipe flows from the top of the tower to the bottom of the tower, and a reflux pump is provided on the reflux pipe.
[0007] Preferably, the filling pipe is a perforated pipe, and the hole spacing of the perforated pipe is 1cm-2cm.
[0008] Preferably, the water inlet pipe is connected to both sides of the main reaction tower so that water can enter both sides of the main reaction tower at the same time.
[0009] Preferably, the water inlet pipe and the filling pipe are made of stainless steel.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] The utility model provides a highly efficient heterogeneous Fenton catalytic oxidation reactor, in which a pre-reactor is arranged at the front end of a reaction tower, where a certain proportion of ferrous sulfate and hydrogen peroxide are added to generate a first-order heterogeneous Fenton reaction, which can effectively promote a sufficient contact reaction between difficult-to-degrade organic pollutants and reagents, and improve the reaction efficiency of Fenton catalytic oxidation in the reaction tower.
[0012] A secondary dosing link is set at the bottom of the reaction tower. The dosing is done through a perforated tube to promote the full mixing of ferrous sulfate, hydrogen peroxide and sewage, resulting in a second-stage heterogeneous Fenton reaction and improving the reaction efficiency.
[0013] The utility model is provided with an internal reflux pipeline, and the rising flow rate of the reactor can be controlled by controlling the reflux amount, so that the Fenton catalyst is prompted to fully contact with the mixed liquid, and the precipitation of the Fenton catalyst can also be prevented.
[0014] The utility model can further improve the reaction efficiency of the heterogeneous Fenton system. Through the two-stage heterogeneous Fenton reaction, the removal efficiency of difficult-to-degrade pollutants is greatly improved, while the efficiency of the use of reagents is improved, the dosage of reagents is reduced, and the operating costs are effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.
[0016] Figure 2 yes Figure 1 AA top view.
[0017] In the above drawings: 1. main reaction tower; 2. water inlet pipe; 3. water distributor; 4. water outlet guide; 5. water outlet pipe; 6. pre-catalytic reactor; 7. agitator; 8. ferrous sulfate dosing pipe; 9. hydrogen peroxide dosing pipe; 10. reflux pipe; 11. reflux pump; 12. filling pipe; 13. water inlet pump. DETAILED DESCRIPTION
[0018] 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.
[0019] like Figure 1-Figure 2 As shown, as a preferred embodiment of the utility model, this embodiment provides a heterogeneous Fenton catalytic oxidation reactor for high-efficiency reaction, including a main reaction tower 1 and a water inlet pipe 2 connected to the main reaction tower 1, a water distributor 3 is arranged at the bottom of the main reaction tower 1, two filling pipes 12 are arranged above the water inlet pipe 2 at the bottom of the main reaction tower 1, a water outlet guide 4 is arranged at the top of the main reaction tower 1, and a water outlet pipe 5 is arranged on the upper part of the water outlet guide 4, and the water outlet guide 4 can be an inclined plate or an inclined tube filler, which has the function of intercepting the catalyst to prevent the catalyst from being lost; a pre-catalytic reactor 6 is arranged at the front end of the main reaction tower 1, an agitator 7 is arranged in the pre-catalytic reactor 6, and a water inlet pump 13 is arranged between the main reaction tower 1 and the pre-catalytic reactor 6; the upper end of the pre-catalytic reactor 6 is connected to a ferrous sulfate dosing pipe 8 and a hydrogen peroxide dosing pipe 9. In order to extend the service life of the pipeline, the water inlet pipe 2 and the filling pipe 12 are preferably made of stainless steel.
[0020] In some preferred embodiments, a reflux pipe 10 is provided on the top of the main reaction tower 1. The reflux pipe 10 flows from the top of the tower to the bottom of the tower. A reflux pump 11 is provided on the reflux pipe 10. In this embodiment, water can be introduced from the bottom of the tower through the reflux pipe 10 under the action of the reflux pump 11. By controlling the amount of reflux water, the rising flow rate of the sewage and the reagent mixture can be controlled to 4~8m / s, thereby causing the solid phase catalyst to be in a fluidized state and improving the reaction efficiency.
[0021] In some preferred embodiments, the filling pipe 12 is a perforated pipe with a hole spacing of 1 cm-2 cm. The perforated pipe improves the uniformity of drug addition and helps to react quickly.
[0022] In some preferred embodiments, the water inlet pipe 2 is connected to both sides of the main reaction tower 1 so that water can be simultaneously introduced into both sides of the main reaction tower 1, thereby improving water inlet efficiency and water distribution uniformity.
[0023] When the utility model is used, the pH of the incoming water is first adjusted to about 3-5, and the incoming water enters the pre-catalytic reactor 6, where the incoming water stays for 15-30 seconds, and a certain amount of ferrous sulfate and hydrogen peroxide are added through the ferrous sulfate dosing pipe 8 and the hydrogen peroxide dosing pipe 9, and the incoming water is stirred and then discharged. This link performs a primary heterogeneous Fenton reaction inside the pre-catalytic reactor 6, so that the high-concentration difficult-to-degrade wastewater is preliminarily treated to remove some large molecular difficult-to-degrade pollutants.
[0024] After the water comes out of the pre-catalytic reactor 6, the pipeline is divided into two. Under the action of the water inlet pump 13, water enters the bottom of the main reaction tower 1. After entering the bottom of the tower, the sewage rises evenly through the upper water distributor 3 for water distribution.
[0025] When in use, a solid phase catalyst can also be added inside the tower body, and the catalyst and the mixed liquid form a fluidized bed reaction zone for full mixing and reaction. A secondary heterogeneous Fenton reaction is carried out inside the main reaction tower. The reactor introduces new Fe2+ to promote the re-decomposition of residual organic matter in the wastewater. The secondary heterogeneous Fenton reaction has a very good removal effect on organic matter that cannot be completely decomposed in the first-stage reactor.
[0026] The wastewater after the reaction in the main reaction tower 1 enters the outlet diversion area, and the wastewater enters through the outlet trough. The catalyst hits the outlet diverter 4 and remains in the reaction tower.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A heterogeneous Fenton catalytic oxidation reactor for high-efficiency reaction, comprising a main reaction tower (1) and a water inlet pipe (2) connected to the main reaction tower (1), a water distributor (3) is arranged at the bottom of the main reaction tower (1), two filling pipes (12) are arranged at the bottom of the main reaction tower (1) above the water inlet pipe (2), a water outlet guide (4) is arranged at the top of the main reaction tower (1), and a water outlet pipe (5) is arranged on the upper part of the water outlet guide (4), characterized in that: A precatalytic reactor (6) is arranged at the front end of the main reaction tower (1), a stirrer (7) is arranged in the precatalytic reactor (6), and a water inlet pipe (2) is provided with a water inlet pump (13) between the main reaction tower (1) and the precatalytic reactor (6); and the upper end of the precatalytic reactor (6) is connected to a ferrous sulfate dosing pipe (8) and a hydrogen peroxide dosing pipe (9).
2. The heterogeneous Fenton catalytic oxidation reactor for high efficiency reaction according to claim 1, characterized in that: A reflux pipe (10) is provided at the top of the main reaction tower (1). The reflux pipe (10) flows from the top of the tower to the bottom of the tower. A reflux pump (11) is provided on the reflux pipe (10).
3. The heterogeneous Fenton catalytic oxidation reactor for high efficiency reaction according to claim 1, characterized in that: The filling pipe (12) is a perforated pipe, and the opening spacing of the perforated pipe is 1 cm-2 cm.
4. The heterogeneous Fenton catalytic oxidation reactor for high efficiency reaction according to claim 1, characterized in that: The water inlet pipe (2) is connected to both sides of the main reaction tower (1), so that water can flow into both sides of the main reaction tower (1) at the same time.
5. The heterogeneous Fenton catalytic oxidation reactor for high efficiency reaction according to claim 1, characterized in that: The water inlet pipe (2) and the filling pipe (12) are made of stainless steel.