Surface heating catalytic oxidation reactor with large length-diameter ratio

Abstract

The invention discloses a large-length-diameter-ratio surface heating catalytic oxidation reactor. The reactor comprises a cylindrical shell, a catalyst placed in the cylindrical shell, a heating film element fixed to the side wall of the cylindrical shell, a fixed end cover assembly fixed to one end of the cylindrical shell and an elastic end cover assembly fixed to the other end of the cylindrical shell. The fixed end cover assembly and the elastic end cover assembly are each provided with a channel used for a working medium to penetrate through and communicate with the cylindrical shell. The elastic end cover assembly comprises an elastic element used for pressing the catalyst. Direct heat input to the catalyst is realized through the heating membrane element, the heating efficiency is high, and the uniformity and stability of the temperature field of the reactor can be effectively maintained; fixing and continuous compression compensation of the catalyst are achieved through the elastic end cover assembly, a short-circuit channel formed by size reduction caused by abrasion of the catalyst can be effectively avoided, and various mechanical environments in the rocket launching stage can be tolerated.

Description

Technical Field

[0001] The invention belongs to the field of catalytic oxidation, and in particular relates to a large aspect ratio surface heating catalytic oxidation reactor. Background Art

[0002] With the shortage of water resources and the continuous deterioration of the water environment, the recycling of sewage has become an important issue, and the removal of small molecular organic matter in sewage is a difficult problem in sewage treatment.

[0003] Catalytic oxidation treatment is a research hotspot for the treatment of refractory organic matter in wastewater. Catalytic oxidation uses oxidants to oxidize organic pollutants in water under conditions of catalyst, temperature, pressure, etc., decomposing them into carbon dioxide and water or organic acids, thereby achieving harmless treatment.

[0004] Thermal catalytic oxidation sewage treatment reactors are currently used in sewage treatment practices. However, existing thermal catalytic oxidation reactors have the problems of high energy consumption, high cost, complex structure and small scope of application. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of existing heating catalytic oxidation reactors, such as high energy consumption, high cost, complex structure and small application range.

[0006] The purpose of the present invention is to adopt the following technical solutions to achieve:

[0007] A large aspect ratio surface heating catalytic oxidation reactor, comprising: a cylindrical shell, a catalyst placed inside the cylindrical shell, a heating membrane element fixed to the side wall of the cylindrical shell, a fixed end cap assembly fixed to one end of the cylindrical shell, and an elastic end cap assembly fixed to the other end of the cylindrical shell;

[0008] The fixed end cover assembly and the elastic end cover assembly both have passages for the working medium to pass through and are in communication with the cylindrical shell;

[0009] The elastic end cap assembly includes an elastic element for compressing the catalyst.

[0010] Preferably, the cylindrical shell is a circular tubular structure.

[0011] Preferably, the catalyst comprises a platinum-ruthenium noble metal catalyst supported on alumina.

[0012] Preferably, the particle size of the catalyst is 2 to 4 mm.

[0013] Preferably, the specific surface area of ​​the catalyst is ≮120 m2 / g.

[0014] Preferably, the catalyst has a crushing strength of ≮15N.

[0015] Preferably, the heating film element wraps the surface of the cylindrical shell.

[0016] Preferably, the fixed end cover assembly includes a first fixed end cover having a through hole fixed to the cylindrical shell, a porous plate fixed to the first fixed end cover, and a first sealing ring arranged between the first fixed end cover and the cylindrical shell; there is a cavity for accommodating the working medium between the first fixed end cover and the porous plate.

[0017] Preferably, the porous plate is a bowl-shaped structure with evenly distributed through holes.

[0018] Preferably, the elastic end cover assembly includes a second fixed end cover having a second through hole fixed to the cylindrical shell, a porous pressure plate slidingly engaged with the cylindrical shell, a spring arranged between the porous pressure plate and the second fixed end cover, and a second sealing ring arranged between the second fixed end cover and the cylindrical shell.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention discloses a large aspect ratio surface heating catalytic oxidation reactor, the reactor comprising: a cylindrical shell, a catalyst placed inside the cylindrical shell, a heating membrane element fixed to the side wall of the cylindrical shell, a fixed end cover assembly fixed to one end of the cylindrical shell, and an elastic end cover assembly fixed to the other end of the cylindrical shell; the fixed end cover assembly and the elastic end cover assembly both have passages for the passage of working fluid and are in communication with the cylindrical shell; the elastic end cover assembly comprises an elastic element for pressing the catalyst. The present invention realizes direct heat input to the catalyst through the heating membrane element with high heating efficiency, can effectively maintain the uniformity and stability of the reactor temperature field, and is conducive to the efficient and continuous reaction; the catalyst is fixed and continuously compressed and compensated by the elastic end cover assembly, which can effectively avoid the short-circuit channel formed by the volume reduction caused by catalyst wear, improve the utilization efficiency of the catalyst, and can withstand various mechanical environments such as vibration and impact during the rocket launch phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a large aspect ratio surface heating catalytic oxidation reactor of the present invention;

[0022] Figure 2 This is an appearance diagram of a large aspect ratio surface heating catalytic oxidation reactor of the present invention;

[0023] Figure 3 This is a schematic diagram of a large aspect ratio surface heating catalytic oxidation reactor of the present invention;

[0024] Among them: 1-cylindrical shell, 2-catalyst, 3-heating membrane element, 4-fixed end cover assembly, 5-elastic end cover assembly, 6-insulation layer, 41-first fixed end cover, 42-porous plate, 43-first sealing ring, 44-cavity, 45-first through hole, 46-first bolt, 51-second fixed end cover, 52-second through hole, 53-porous pressure plate, 54-spring, 55-second sealing ring, 56-second bolt, 101-1st stage reactor, 102-2nd stage reactor, 103-3rd stage reactor, 104-4th stage reactor, 105-5th stage reactor, 20-connector, 30-integrated end cover. DETAILED DESCRIPTION

[0025] The technical solution is further described below with reference to the accompanying drawings and specific embodiments to facilitate understanding of the content of the present invention.

[0026] like Figure 1 and Figure 2 As shown, a large aspect ratio surface heating catalytic oxidation reactor comprises: a cylindrical shell 1, a catalyst 2 placed inside the cylindrical shell 1, a heating membrane element 3 fixed to the side wall of the cylindrical shell 1, a fixed end cap assembly 4 fixed to one end of the cylindrical shell 1, and an elastic end cap assembly 5 fixed to the other end of the cylindrical shell 1;

[0027] The fixed end cover assembly 4 and the elastic end cover assembly 5 both have passages for the working medium to pass through and are connected to the cylindrical shell 1;

[0028] The elastic end cover assembly 5 includes an elastic element for compressing the catalyst.

[0029] The elastic element in this embodiment is a spring 54 .

[0030] The cylindrical shell 1 is a circular tubular structure with an inner diameter of 36 mm and an aspect ratio of 7.3:1.

[0031] The catalyst 2 includes a platinum-ruthenium noble metal catalyst supported on alumina.

[0032] The particle size of the catalyst 2 is 2 to 4 mm (mass fraction is not less than 98%).

[0033] The specific surface area of ​​the catalyst 2 is ≮120 m 2 / g.

[0034] The crushing strength of the catalyst 2 is ≮15N.

[0035] The heating film element 3 wraps the surface of the cylindrical shell.

[0036] The fixed end cap assembly 4 includes a first fixed end cap 41 fixed to the cylindrical shell 1 and having a first through hole 45, a porous plate 42 fixed to the first fixed end cap 41, and a first sealing ring 43 disposed between the first fixed end cap 41 and the cylindrical shell 1. A cavity 44 for containing a working medium is defined between the first fixed end cap 41 and the porous plate 42. The first fixed end cap 41 is secured to the cylindrical shell 1 by first bolts 46.

[0037] The porous plate 42 is a bowl-shaped structure with evenly distributed through holes.

[0038] The elastic end cap assembly 5 includes a second fixed end cap 51 fixed to the cylindrical shell 1 and having a second through hole 52, a porous pressure plate 53 slidingly engaged with the cylindrical shell 1, a spring 54 disposed between the porous pressure plate 53 and the second fixed end cap 51, and a second sealing ring 55 disposed between the second fixed end cap 51 and the cylindrical shell 1. The loading port for the catalyst 2 is designed with a volume compensation device with a pre-loaded spring structure. After the catalyst 2 is loaded, the porous pressure plate 53 is installed, followed by the spring 54 and the second fixed end cap 51. The compression force is designed to be 10N. The second fixed end cap 51 is secured to the cylindrical shell 1 by a second bolt 56.

[0039] The present invention is applicable to the catalytic reaction of gas or liquid working medium.

[0040] The catalyst loading capacity of a single tubular reactor can reach 300 ml. By changing the connection mode of the inlet and outlet of the end covers on both sides, the independent operation of a single tubular reactor and the conversion of the series and parallel relationship of multiple tubular reactors can be realized.

[0041] Figure 1 This is a cross-section of a single reactor tube. The product inlet features a volume compensation device with a preloaded spring structure. After the catalyst material is loaded, a compression plate is inserted, followed by the spring and compression end cap. The outlet features a plunger seal with a double-pass seal and uniformly perforated holes in the compression end cap. The heating membrane element provides stable and even thermal input to the catalytic oxidation reaction, achieving a uniform and stable temperature field within the reactor and ensuring efficient and stable catalytic oxidation reaction.

[0042] Figure 2 This is an external view of a large aspect ratio surface heating catalytic oxidation reactor of the present invention. A single reaction tube is a cylindrical structure, which is composed of a fixed end cover assembly 4, an insulation layer 6, and an elastic end cover assembly 5.

[0043] Figure 3This is a diagram of the assembly of reactors in series according to the present invention, comprising a first-stage reactor 101, a second-stage reactor 102, a third-stage reactor 103, a fourth-stage reactor 104, and a fifth-stage reactor 105 connected in series. The integrated design minimizes the overall size of the reactor while meeting catalyst loading requirements and aspect ratios. Furthermore, by adapting the connection and fixation of the integrated end caps 30 on both sides and connecting the inlets and outlets of adjacent reactors via connectors 20 to achieve series connection, multiple tubular reactors can be used in series and parallel, improving processing efficiency and the scope of application of the present invention.

[0044] The characteristics of the present invention are that a large-area heating film element is used to achieve uniform and stable control of the reactor temperature field; the reactor has a large aspect ratio, and a volume compensation device with a pre-loaded spring structure is designed on one side, which can effectively avoid the short-circuit channel formed by volume collapse caused by catalyst wear; the precious metal catalyst particles used are uniform, large specific surface area, and high mechanical strength; the reactor has a simple structure and high reliability, and can be used in series or parallel according to actual needs; the reactor can withstand various mechanical environments such as vibration and impact during the rocket launch phase.

[0045] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention.

Claims

1. A large aspect ratio surface heating catalytic oxidation reactor, characterized in that: The reactor comprises: a cylindrical shell, a catalyst placed inside the cylindrical shell, a heating membrane element fixed to the side wall of the cylindrical shell, a fixed end cover assembly fixed to one end of the cylindrical shell, and an elastic end cover assembly fixed to the other end of the cylindrical shell; The fixed end cover assembly and the elastic end cover assembly both have passages for the working medium to pass through and are in communication with the cylindrical shell; The elastic end cap assembly includes an elastic element for compressing the catalyst.

2. A large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The cylindrical shell is a circular tubular structure.

3. The large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The catalyst comprises a platinum-ruthenium noble metal catalyst supported on alumina.

4. The large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The particle size of the catalyst is 2 to 4 mm.

5. The large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The specific surface area of ​​the catalyst is ≮120 m2 / g.

6. The large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The catalyst has a crushing strength of ≮15N.

7. The large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The heating film element wraps the surface of the cylindrical shell.

8. The large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The fixed end cover assembly includes a first fixed end cover having a first through hole fixed to the cylindrical shell, a porous plate fixed to the first fixed end cover, and a first sealing ring arranged between the first fixed end cover and the cylindrical shell; a cavity for accommodating a working medium is provided between the first fixed end cover and the porous plate.

9. A large aspect ratio surface heating catalytic oxidation reactor according to claim 8, characterized in that: The porous plate is a bowl-shaped structure with evenly distributed through holes.

10. The large aspect ratio surface heating catalytic oxidation reactor according to claim 1, characterized in that: The elastic end cover assembly includes a second fixed end cover having a second through hole fixed to the cylindrical shell, a porous pressure plate slidingly matched with the cylindrical shell, a spring arranged between the porous pressure plate and the second fixed end cover, and a second sealing ring arranged between the second fixed end cover and the cylindrical shell.

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