Zeolite rotating wheel base material for removing VOCs, rotating wheel and rotating wheel preparation method

Abstract

The invention belongs to the field of zeolite rotating wheel preparation, and particularly relates to a VOCs removal zeolite rotating wheel base material, a rotating wheel and a rotating wheel preparation method. The rotating wheel base material is designed to be large in edge thickness and small in center thickness, and the adsorption capacity of all parts of the rotating wheel on the volume can be evenly utilized; compared with an existing rotating wheel, under the same size, the saturated adsorption time of the rotating wheel is greatly prolonged, the adsorption concentration capacity of the rotating wheel is improved, a cut base material can be reused, and cost is saved; by means of the structural design of the rotating wheel base material, the problem that the rotating wheel is prone to penetrating in the using process is solved, VOCs can be evenly adsorbed in rotating wheel hole channels, the VOCs accumulation condition is not prone to occurring, desorption is easy, and the problems of hole blocking and braising combustion are avoided.

Description

Technical Field

[0001] The invention belongs to the field of zeolite rotor preparation, and in particular relates to a VOCs removal zeolite rotor substrate, a rotor, and a rotor preparation method. Background Art

[0002] When producing a VOCs removal zeolite wheel, it is necessary to impregnate the active component, i.e., molecular sieve, on a substrate of a certain shape to achieve the function of adsorbing and concentrating volatile organic compounds (VOCs). The substrate shape currently commonly used in the industry is cylindrical, and its bottom diameter and height can be selected according to demand. However, during the actual operation of the zeolite wheel, the concentration of VOCs in the air duct is not completely uniform, which results in some parts of the zeolite wheel being oversaturated and penetrating, while some parts are not fully adsorbed, and the adsorption capacity of the zeolite wheel is not fully utilized; and the problem of pore blockage often occurs during the operation of the zeolite wheel, and a large amount of VOCs accumulate on the surface of the pores and cannot be desorbed. In severe cases, there is even a risk of smoldering, which brings property losses and personal safety risks to zeolite wheel users. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention provides a VOCs removal zeolite rotor substrate, a rotor, and a rotor preparation method, which can achieve efficient utilization of the rotor and avoid the problem of pore blockage.

[0004] To achieve the above object, the technical solution provided by the present invention is as follows:

[0005] In a first aspect, the present application provides a VOCs removal zeolite wheel substrate, comprising a cylindrical substrate with a notch on the bottom surface, wherein the cylindrical substrate with the notch is axially arranged in an air duct, and the thickness decreases from the edge to the center.

[0006] Optionally, the edge thickness of the cylindrical substrate with the notch is twice the center thickness.

[0007] Optionally, the notch is conical, and the bottom surface of the conical notch is the same size as and overlaps with the bottom surface of the cylindrical substrate with the notch.

[0008] Optionally, the notches are arranged on both sides of the cylindrical substrate with the notches.

[0009] Optionally, the cylindrical substrate with the notch is provided with corrugated channels, and the corrugated channels have an edge length of 3 mm and a height of 2 mm.

[0010] Optionally, the bottom diameter of the cylindrical substrate with the notch is 4250 mm and the height is 600 mm, and the height of the conical notch is 50 mm.

[0011] In a second aspect, the present application further provides a VOCs removal zeolite rotor, comprising the VOCs removal zeolite rotor substrate as described in the first aspect of claim 1, and also comprising a molecular sieve, wherein the molecular sieve is loaded on the VOCs removal zeolite rotor substrate.

[0012] Optionally, the molecular sieve is an MFI type molecular sieve and / or a FAU type molecular sieve and / or an LTA type molecular sieve and / or a BEA type molecular sieve and / or a MOR type molecular sieve and / or an IMF type molecular sieve and / or a MER type molecular sieve, etc.

[0013] In the third aspect, the present application also provides a method for preparing the VOCs removal zeolite rotor described in the third aspect, comprising the following steps: first, cutting the cylindrical substrate inward from the bottom surfaces on both sides in a certain notch shape, and obtaining the VOCs removal zeolite rotor substrate after purging; then, impregnating the VOCs removal zeolite rotor substrate with molecular sieves, and drying after the impregnation is completed to obtain the VOCs removal zeolite rotor.

[0014] Compared with the prior art, this application has at least the following beneficial effects:

[0015] The present invention designs the rotor substrate to have a large edge thickness and a small center thickness, so that the adsorption capacity of each part of the rotor volume can be evenly utilized; compared with the existing rotor, under the same volume, the saturated adsorption time of the rotor is greatly prolonged, the adsorption and concentration capacity of the rotor is improved, and the cut substrate can be reused, saving costs; through the structural design of the rotor substrate, the problem of easy penetration during the use of the rotor is solved, VOCs will be evenly adsorbed in the rotor pores, VOCs are not likely to accumulate, desorption is easy, and the problems of pore blockage and smoldering are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 Schematic diagram of VOCs concentration field in the air duct of the simulation model;

[0018] Figure 2 Schematic diagram of VOCs concentration field in the cross section of the air duct of the simulation model;

[0019] Figure 3 This is a schematic diagram of the structure of a VOCs removal zeolite wheel substrate in an embodiment of the present application;

[0020] Figure 4This is a side view of a VOCs removal zeolite wheel substrate in an embodiment of the present application;

[0021] Description of reference numerals:

[0022] 1. Cylindrical substrate with notch; 11. Edge; 12. Center; 2. Notch. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use.

[0024] When the zeolite wheel is actually running, the VOCs concentration in the air duct is not the same. This application uses turbulence model, multiphase flow model, drag model, etc., and computer simulation software to simulate the VOCs concentration at various locations in the air duct. The results are as follows Figure 1 , Figure 2 (Cross-sections of three randomly selected locations in the air duct) are shown. Figure 1 The gas flow direction in the middle air duct is from bottom to top (the same color represents the same concentration). It can be seen that the VOCs concentration at the edge of the air duct is higher than the VOCs concentration in the center of the air duct. When using the cylindrical zeolite wheel in the prior art, oversaturation penetration is more likely to occur at the edge of the cylinder, and low utilization rate and waste are more likely to occur in the center of the cylinder.

[0025] The VOCs generation experiment was conducted on the laboratory duct adsorption test bench. The VOCs content in the duct was roughly the same as the actual working condition. The FID non-methane total hydrocarbon tester was used to test the VOCs concentration in the duct. Three positions of the duct were randomly selected, and the VOCs concentrations at the edge and center of the duct were measured respectively. The results are shown in Table 1. It can be seen that the VOCs concentration in the working duct has the characteristics of high edge and low center, which is the same as the conclusion of the adsorption simulation model; and the edge concentration is about twice the center concentration.

[0026] Table 1 VOCs concentration in the air duct

[0027] <![CDATA[Central concentration (mg / m 3 )]]> <![CDATA[Edge concentration (mg / m 3 )]]> Position A 257.4 514.6 Location B 267.3 555.1 Position C 191.7 428.2

[0028] Example 1

[0029] like Figure 3 As shown, a VOCs removal zeolite wheel substrate comprises a cylindrical substrate 1 with a notch on the bottom surface. The cylindrical substrate 1 with the notch is arranged in the air duct along the axial direction, and the thickness decreases from the edge 11 to the center 12.

[0030] In view of the situation that the concentration at the edge 11 in the air duct is higher than that at the center 12, the thickness of the edge 11 is set to be larger and the thickness of the center 12 is set to be thinner. For the molecular sieve loaded on the rotor substrate, the rotor substrate of the present invention can evenly utilize the adsorption capacity of each part of the rotor volume; compared with the existing rotor, under the same volume, the saturated adsorption time of the rotor is greatly prolonged, and the adsorption concentration capacity of the rotor is improved.

[0031] Example 2

[0032] The difference between this embodiment and embodiment 1 is that: Figure 4 As shown, the thickness of the edge 11 of the cylindrical substrate 1 with the notch is twice the thickness of the center 12, so as to better fit the actual working conditions and more efficiently absorb volatile organic compounds.

[0033] The notch 2 is conical, and the bottom surface of the conical notch 2 is the same size and overlaps with the bottom surface of the cylindrical substrate 1 with the notch, so that the thickness of the substrate gradually decreases from the outside to the inside. Notches 2 are set on both sides of the cylindrical substrate 1 with the notch, so that the two sides of the wheel are symmetrical, which facilitates the wheel to maintain balance during rotation.

[0034] In this embodiment, the bottom diameter of the cylindrical substrate 1 with the notch is 4250 mm and the height is 600 mm, and the bottom diameter of the conical notch 2 is 4250 mm and the height is 50 mm.

[0035] The cylindrical substrate 1 with the notch is provided with corrugated channels, the edge length of the corrugated channels is 3 mm, and the height is 2 mm. The design of the corrugated channels increases the surface area of ​​the runner zeolite and improves the adsorption capacity.

[0036] The present application also provides a VOCs removal zeolite rotor, comprising the above-mentioned VOCs removal zeolite rotor substrate, and also comprising a molecular sieve, wherein the molecular sieve is loaded on the VOCs removal zeolite rotor substrate; the molecular sieve is an MFI type molecular sieve and / or a FAU type molecular sieve and / or an LTA type molecular sieve and / or a BEA type molecular sieve and / or a MOR type molecular sieve and / or an IMF type molecular sieve and / or a MER type molecular sieve, etc.

[0037] On the third aspect, the present application also provides a method for preparing a VOCs removal zeolite rotor, comprising the following steps: first, cutting the cylindrical substrate inward from the bottom surfaces on both sides, cutting off a cone on each side of the cylinder, and obtaining the VOCs removal zeolite rotor substrate after purging; then, impregnating the VOCs removal zeolite rotor substrate with molecular sieves, purging and drying after the impregnation is completed, and then obtaining the VOCs removal zeolite rotor.

[0038] The rotor substrate of the present invention has more efficient adsorption. Under the same volume as the traditional rotor, the saturated adsorption time of the rotor is greatly prolonged, the adsorption and concentration capacity of the rotor is improved, and the cut substrate can be reused, saving costs. Through the structural design of the rotor substrate, the problem of easy penetration during the use of the rotor is solved. VOCs will be evenly adsorbed in the rotor pores, VOCs are not prone to accumulation, desorption is easy, and pore blockage and smoldering problems are avoided.

[0039] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A VOCs removal zeolite wheel substrate, characterized in that: The invention comprises a cylindrical substrate with a notch on the bottom surface. The cylindrical substrate with the notch is arranged in the air duct along the axial direction, and the thickness of the cylindrical substrate decreases from the edge to the center.

2. The VOCs removal zeolite wheel substrate according to claim 1, characterized in that: The edge thickness of the cylindrical substrate with the notch is twice the center thickness.

3. The VOCs removal zeolite wheel substrate according to claim 1, characterized in that: The notch is conical, and the bottom surface of the conical notch is the same size as and overlaps with the bottom surface of the cylindrical substrate with the notch.

4. The VOCs removal zeolite wheel substrate according to claim 1, characterized in that: The notches are arranged on both sides of the cylindrical substrate with the notches.

5. The VOCs removal zeolite wheel substrate according to claim 1, characterized in that: The cylindrical substrate with the notch is provided with corrugated channels, and the edge length of the corrugated channels is 2-4 mm and the height is 1-2 mm.

6. The VOCs removal zeolite wheel substrate according to claim 3, characterized in that: The bottom diameter of the cylindrical substrate with the notch is 550-4250 mm and the height is 400-600 mm. The height of the conical notch is 30-100 mm.

7. A VOCs removal zeolite rotor, characterized in that: The invention comprises the VOCs removal zeolite wheel substrate according to any one of claims 1 to 6, and also comprises a molecular sieve, wherein the molecular sieve is loaded on the VOCs removal zeolite wheel substrate.

8. The VOCs removal zeolite rotor according to claim 7, characterized in that: The molecular sieve is an MFI type molecular sieve and / or a FAU type molecular sieve and / or an LTA type molecular sieve and / or a BEA type molecular sieve and / or a MOR type molecular sieve and / or an IMF type molecular sieve and / or a MER type molecular sieve, etc.

9. A method for preparing a VOCs removal zeolite rotor according to any one of claims 7 to 8, characterized in that: The method comprises the following steps: firstly, cutting a cylindrical substrate inward from the bottom surfaces on both sides in a certain notch shape, and obtaining the VOCs removal zeolite rotor substrate after purging; then, impregnating the VOCs removal zeolite rotor substrate with molecular sieves, and drying after the impregnation to obtain the VOCs removal zeolite rotor.

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