Catalytic wet oxidation reactor
By adding a catalyst feed distributor and a steam distribution pipe to the catalytic wet oxidation reactor, the catalyst solution is preheated, the problems of catalyst loss and uneven reaction are solved, the reaction efficiency is improved and the cost is reduced.
Patent Information
- Application Number
- CN202423123775.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In the existing catalytic wet oxidation reactors, the catalyst loss is severe, and the direct addition of the cold catalyst solution to the reactor will lead to uneven reactions and the precipitation of catalyst ions, affecting the reaction efficiency.
A catalytic wet oxidation reactor is designed. By adding a catalyst feed distributor and a steam distribution pipe inside the reactor, the catalyst solution can be preheated and the addition amount and loss of the catalyst can be reduced.
By preheating the catalyst solution, the activity of the catalyst is improved, the addition amount and loss of the catalyst are reduced, the control of the reaction process is enhanced, and the cost is reduced.
Smart Images
Figure CN222374475U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an oxidation reactor, in particular to a catalytic wet oxidation reactor. Background Art
[0002] Catalytic wet oxidation (CWAO) technology is a popular technology for wastewater thermal treatment. Its reaction mechanism mainly relies on the strong oxidizing hydroxyl radicals generated by the catalytic reaction of oxidants under high temperature and high pressure. These free radicals can directly oxidize organic pollutants and harmful substances such as nitrogen and sulfur in wastewater into harmless substances, such as CO2, H2O, N2 and SO4. 2- The CWAO technology has attracted wide attention due to its advantages of high removal rate, low operating cost, strong adaptability, no secondary pollution, simplified process and space saving.
[0003] In the existing CWAO reactor, the catalyst exists in the form of a solution, with many active sites for the reaction and good catalytic effect. However, there is a loss of catalyst during the reaction process, which is not conducive to the reaction and requires the addition of catalyst to maintain normal reaction. In addition, the mixed solution of catalyst and wastewater usually enters the heat exchanger together for heating before being sent to the reactor. However, due to lack of oxygen in the heat exchanger, the wastewater will coke under the action of the catalyst, causing the heat exchanger to be blocked. At the same time, the coking will adsorb the catalyst ions, causing the loss of the catalyst. The above problems can be solved by directly adding the catalyst to the reactor. However, if the cold catalyst solution is directly added to the reactor, the local temperature in the reactor will be low, resulting in uneven reaction. In addition, due to the rapid change of the catalyst ion temperature, the catalyst ions will settle, greatly reducing the reaction efficiency.
[0004] Therefore, it is urgent to find a catalytic wet oxidation reactor that can reduce the amount of catalyst added, reduce catalyst loss, preheat the catalyst solution, has a simple structure, low cost, and is suitable for industrial production. Utility Model Content
[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned defects of the prior art and provide a catalytic wet oxidation reactor which can reduce the amount of catalyst added, reduce catalyst loss, preheat the catalyst solution, has a simple structure, low cost and is suitable for industrial production.
[0006] The technical solution adopted by the utility model to solve its technical problems is as follows: a catalytic wet oxidation reactor, comprising a cylinder; the cylinder is provided with: an anti-backmixing plate, a catalyst feed distributor, a gas distributor and a steam distribution pipe in sequence from top to bottom; a material inlet is provided at the bottom of the cylinder, and a material outlet is provided at the top of the cylinder; the anti-backmixing plate comprises a bubble-cap type plate, a float valve type plate or a sieve plate type plate; the catalyst inlet opened on the outer side of the lower part of the cylinder is connected to the catalyst feed distributor through an internal heat transfer pipe extending upward; the internal heat transfer pipe is S-shaped, or is coiled along the inner wall of the cylinder or is freely placed; the gas distributor and the steam distribution pipe are located at the lower part of the cylinder, and are respectively connected to the gas inlet and the steam inlet opened on the outer side of the lower part of the cylinder.
[0007] The working process of the catalytic wet oxidation reactor of the utility model is as follows: clean water is injected from the material inlet at the bottom of the cylinder, the feed water flow is guided to flow out along the inner wall of the bottom end cap of the cylinder through the back-mixing cap, and evenly dispersed in the reactor, and then steam is sent from the steam inlet to the reactor through the steam distribution pipe for heating, and after heating to the reaction temperature, oxidizing gas is sent from the gas inlet, and then exposed to the reactor through the gas distributor, and after the tail gas can detect the added oxidizing gas, the material inlet at the bottom of the cylinder is improved from clean water to the wastewater to be treated, and at the same time, a catalyst solution is injected from the catalyst inlet at the bottom of the cylinder, and the catalyst solution flows through the inside of the reactor for heat transfer The pipeline is preheated and then enters the reactor through the catalyst feed distributor; the precipitate in the reactor is deposited on the back-mixing cap and then gradually flushed by the feed into the upper part of the reactor and flows out with the produced water; in the reactor, the gas and liquid phases flow in the same direction and in parallel, the wastewater first undergoes a catalyst-free wet oxidation reaction with the oxidizing gas to cause primary degradation of the wastewater, and then mixes with the catalyst solution upward to undergo a catalytic wet oxidation reaction to further deeply degrade the wastewater; the gas-liquid mixed product after degradation flows upward through the anti-back-mixing tower plate, and at the same time the anti-back-mixing tower plate prevents the incompletely reacted feed liquid from back-mixing upward, and then is discharged from the material outlet at the top of the cylinder.
[0008] The utility model catalytic wet oxidation reactor realizes separate preheating of the catalyst by adding a catalyst feed distributor inside, assisted by a steam distribution pipe, which can reduce the amount of catalyst added, reduce loss, and reduce costs; the utility model catalytic wet oxidation reactor can be further applied to advanced oxidation methods such as catalytic wet peroxide oxidation reaction, ozone oxidation method, sulfate free radical oxidation method, etc.
[0009] Preferably, the height-to-diameter ratio of the cylinder is 5 to 15:1.
[0010] Preferably, the anti-backmixing tray is provided with one or more sets. The anti-backmixing tray is detachable. The anti-backmixing tray can prevent the wastewater from backmixing upward, causing the high-concentration wastewater that has not been fully reacted on the lower side to pollute the low-concentration produced water on the upper side.
[0011] Preferably, the distance between each group of anti-backmixing trays, the distance between the uppermost anti-backmixing tray and the top of the cylinder, and the distance between the lowermost anti-backmixing tray and the catalyst feed distributor are 5 to 10 m.
[0012] Preferably, the thickness of the sieve plate type tower plate is 3 to 20 mm, the sieve hole size is 2 to 4 mm, and the hole spacing is 10 to 30 mm.
[0013] Preferably, the catalyst feed distributor is provided with one or more groups. The catalyst feed distributor is detachable.
[0014] Preferably, the catalyst feed distributor comprises a fishbone-shaped, cross-shaped or annular distribution pipe, etc. More preferably, the catalyst feed distributor is a cross-shaped distribution pipe.
[0015] Preferably, the distribution pipe of the catalyst feed distributor is provided with uniform small holes, wherein the diameter of the small holes is 0.5 to 3.0 mm, and the spacing between the small holes is 5 to 20 mm.
[0016] Preferably, the catalyst feed distributor is located at a height of 1 / 10 to 1 / 2 from the bottom end of the cylinder.
[0017] Preferably, the length of the internal heat transfer pipe is 5 to 20 m. When the height of the cylinder is small or the catalyst feed distributor is close to the catalyst inlet, in order to ensure the length of the internal heat transfer pipe, the internal heat transfer pipe is designed to be S-shaped, or coiled along the inner wall of the cylinder or freely placed. Under the above length, it is ensured that the catalyst can be fully preheated after flowing through the internal heat transfer pipe of the reactor.
[0018] Preferably, the gas distributor is detachable, and a common perforated tube gas distributor or a microporous membrane gas distributor in a wet oxidation reactor according to CN220098708U is selected.
[0019] Preferably, the height of the gas distributor from the bottom end of the cylinder is 0.3-3.0 m, and the height difference between the catalyst feed distributor and the gas distributor is ≥1 m.
[0020] Preferably, the steam distribution pipe includes a fishbone-shaped, cross-shaped or annular distribution pipe, etc. More preferably, the steam distribution pipe is an annular distribution pipe. The steam distribution pipe is detachable.
[0021] Preferably, the steam distribution pipe is provided with uniform small holes, wherein the diameter of the small holes is 0.5-3.0 mm, and the spacing between the small holes is 5-20 mm.
[0022] Preferably, the height of the steam distribution pipe from the bottom end of the cylinder is 0.2 to 2.0 m.
[0023] Preferably, a back-mixing cap is provided inside the cylinder of the material inlet, which is used to guide the feed water flow to flow out along the inner wall of the bottom end cap of the cylinder, which is conducive to uniform dispersion of the water flow and prevents the particles in the reactor from being deposited at the bottom of the reactor.
[0024] Preferably, the back-mixing cap is a cone or umbrella-shaped structure.
[0025] Preferably, the height of the back-mixing cap from the bottom end of the cylinder is 0.1-0.5 m.
[0026] The beneficial effects of the utility model are as follows:
[0027] (1) The catalytic wet oxidation reactor of the utility model adds a catalyst feed distributor and a steam distribution pipe inside the reactor, so that the catalyst solution can be preheated before entering the medium and high temperature zone of the reactor, which is conducive to accelerating the catalytic effect, reducing the amount of catalyst added, avoiding catalyst loss, and enhancing the control of the reaction process, thereby reducing costs;
[0028] (2) The catalytic wet oxidation reactor of the utility model has a simple structure, low cost and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 This is a schematic structural diagram of a catalytic wet oxidation reactor according to Example 1 of the utility model;
[0030] Figure 2 1 is a top view of a catalyst feed distributor in a catalytic wet oxidation reactor according to Example 1 of the present utility model;
[0031] Figure 3 It is a schematic diagram of the structure of the steam distribution pipe in the catalytic wet oxidation reactor of Example 1 of the utility model;
[0032] In the figure: cylinder 1; material inlet 1-1; material outlet 1-2; catalyst inlet 1-3; gas inlet 1-4; steam inlet 1-5; anti-backmixing tray 2; catalyst feed distributor 3; internal heat transfer pipe 3-1; gas distributor 4; steam distribution pipe 5; backmixing cap 6. DETAILED DESCRIPTION
[0033] The utility model is further described below in conjunction with embodiments and drawings.
[0034] A catalytic wet oxidation reactor embodiment 1
[0035] like Figures 1 to 3As shown, a catalytic wet oxidation reactor comprises a cylinder 1 (2m in diameter, 20m in height, and a height-to-diameter ratio of 10:1); the cylinder 1 is provided with an anti-backmixing tray 2, a catalyst feed distributor 3, a gas distributor 4, and a steam distributor pipe 5 from top to bottom; a material inlet 1-1 is provided at the bottom of the cylinder 1, and a material outlet 1-2 is provided at the top of the cylinder 1; a catalyst inlet 1-3 opened on the outer side of the lower part of the cylinder 1 is connected to the catalyst feed distributor 3 through an S-shaped internal heat transfer pipe 3-1 extending upwardly and having a length of 10m; the gas distributor 4 and the steam distributor pipe 5 are located at the lower part of the cylinder 1, and are connected to the gas inlet 1-4 and the steam inlet 1-5 opened on the outer side of the lower part of the cylinder 1 respectively;
[0036] The anti-backmixing tray 2 is provided with two groups, which are detachable sieve trays with a thickness of 15 mm, a sieve hole size of 3 mm, and a hole spacing of 20 mm; the distance between the two groups of anti-backmixing trays 2 is 5 m, the distance between the top anti-backmixing tray 2 and the top of the cylinder 1 is 5 m, and the distance between the bottom anti-backmixing tray 2 and the catalyst feed distributor 3 is 5 m;
[0037] The catalyst feed distributor 3 is a set of detachable cross-shaped distribution pipes made of TA9 material; the distribution pipes are provided with uniform small holes, wherein the diameter of the small holes is 1 mm and the spacing between the small holes is 10 mm; the height of the catalyst feed distributor 3 from the bottom end of the cylinder 1 is 5 m;
[0038] The gas distributor 4 is detachable, and is selected from the horizontal tubular nickel alloy metal film gas distributor in Example 1 of a wet oxidation reactor of CN220098708U; the height of the gas distributor 4 from the bottom end of the cylinder 1 is 1m;
[0039] The steam distribution pipe 5 is a detachable annular distribution pipe; the steam distribution pipe 5 is provided with uniform small holes, wherein the diameter of the small holes is 1 mm and the spacing between the small holes is 10 mm; the height of the steam distribution pipe 5 from the bottom end of the cylinder 1 is 0.5 m;
[0040] A back-mixing cap 6 is provided inside the cylinder 1 of the material inlet 1 - 1 ; the back-mixing cap 6 is a conical structure with a radius of 200 mm and a height of 200 mm; the height of the back-mixing cap 6 from the bottom of the cylinder 1 is 0.2 m.
[0041] The working process of the catalytic wet oxidation reactor of the utility model is as follows: clean water is injected from the material inlet 1-1 at the bottom of the cylinder 1, and the feed water flow is guided to flow out along the inner wall of the bottom end cap of the cylinder 1 through the back-mixing cap 6, and evenly dispersed in the reactor, and then steam is sent into the reactor from the steam inlet 1-5 through the steam distribution pipe 5 for heating. After heating to the reaction temperature, the oxidizing gas is sent in from the gas inlet 1-4, and then exposed to the reactor by the gas distributor 4. After the tail gas can detect the added oxidizing gas, the material inlet 1-1 at the bottom of the cylinder 1 is improved with the wastewater to be treated by clean water, and at the same time, the catalyst solution is injected from the catalyst inlet 1-3 at the lower part of the cylinder 1, and the catalyst solution flows through the reaction The heat transfer pipe 3-1 inside the reactor is preheated, and after preheating, it enters the reactor through the catalyst feed distributor 3; the precipitate in the reactor is deposited on the back-mixing cap 6, and then is gradually washed by the feed into the upper part of the reactor and flows out with the produced water; in the reactor, the gas and liquid phases flow in the same direction and flow in parallel, the wastewater first undergoes a catalyst-free wet oxidation reaction with the oxidizing gas to cause primary degradation of the wastewater, and then mixes with the catalyst solution upward to undergo a catalytic wet oxidation reaction to further deeply degrade the wastewater; the gas-liquid mixed product after degradation flows upward through the anti-back-mixing tower plate 2, and at the same time the anti-back-mixing tower plate 2 prevents the incompletely reacted feed liquid from back-mixing upward, and then is discharged from the material outlet 1-2 at the top of the cylinder 1.
Claims
1. A catalytic wet oxidation reactor, characterized in that: It comprises a cylinder; the cylinder is provided with: an anti-backmixing plate, a catalyst feed distributor, a gas distributor and a steam distribution pipe in order from top to bottom; a material inlet is provided at the bottom of the cylinder, and a material outlet is provided at the top of the cylinder; the anti-backmixing plate comprises a bubble-cap type plate, a float valve type plate or a sieve plate type plate; the catalyst inlet opened on the outer side of the lower part of the cylinder is connected to the catalyst feed distributor through an internal heat transfer pipe extending upward; the internal heat transfer pipe is S-shaped, or is coiled along the inner wall of the cylinder or freely placed; the gas distributor and the steam distribution pipe are located at the lower part of the cylinder, and are respectively connected to the gas inlet and the steam inlet opened on the outer side of the lower part of the cylinder.
2. The catalytic wet oxidation reactor according to claim 1, characterized in that: The height-to-diameter ratio of the cylinder is 5 to 15:1; the anti-backmixing tower plates are provided in one or more groups; the distance between each group of anti-backmixing tower plates, the distance between the top anti-backmixing tower plate and the top of the cylinder, and the distance between the bottom anti-backmixing tower plate and the catalyst feed distributor is 5 to 10m; the thickness of the sieve plate type tower plate is 3 to 20mm, the sieve hole size is 2 to 4mm, and the hole spacing is 10 to 30mm.
3. The catalytic wet oxidation reactor according to claim 1 or 2, characterized in that: The catalyst feed distributor is provided with one or more groups; the catalyst feed distributor includes a fishbone-shaped, cross-shaped or annular distribution pipe; the distribution pipe of the catalyst feed distributor is provided with uniform small holes, wherein the diameter of the small holes is 0.5 to 3.0 mm, and the spacing between the small holes is 5 to 20 mm; the catalyst feed distributor is located at a height of 1 / 10 to 1 / 2 from the bottom end of the cylinder; the length of the internal heat transfer pipe is 5 to 20 m.
4. The catalytic wet oxidation reactor according to claim 1 or 2, characterized in that: The height of the gas distributor from the bottom of the cylinder is 0.3-3.0 m, and the height difference between the catalyst feed distributor and the gas distributor is ≥1 m.
5. The catalytic wet oxidation reactor according to claim 1 or 2, characterized in that: The steam distribution pipe includes a fishbone-shaped, cross-shaped or annular distribution pipe; the steam distribution pipe is provided with uniform small holes, wherein the diameter of the small holes is 0.5-3.0 mm, and the spacing between the small holes is 5-20 mm; the height of the steam distribution pipe from the bottom end of the cylinder is 0.2-2.0 m.
6. The catalytic wet oxidation reactor according to claim 1 or 2, characterized in that: A back-mixing cap is provided inside the cylinder at the material inlet; the back-mixing cap is a cone or umbrella-shaped structure; and the height of the back-mixing cap from the bottom of the cylinder is 0.1 to 0.5 m.
Citation Information
Patent Citations
Wet oxidation reactor
CN220098708U