Preparation method and application of magnetic induction heating gas drying agent

Abstract

The invention relates to the field of gas drying, and particularly discloses a magnetic induction heating gas drying agent and a preparation method and application thereof.The method comprises the steps that metal / metal oxide nanoparticles, citric acid and ascorbic acid are mixed in water, washing and drying are conducted after ultrasonic dispersion, and modified metal / metal oxide nanoparticles are obtained; the modified metal / metal oxide nanoparticles, a molecular sieve and a binder are put into water to be stirred, and slurry of the magnetic induction heating gas drying agent is obtained; and molding and roasting the slurry to obtain the granular magnetic induction heating gas drying agent. The prepared magnetic induction heating gas drying agent has the remarkable advantage of low energy consumption in the field of industrial gas drying, in-situ generation of heat is achieved through the alternating magnetic field, the heating speed is high, the heat transfer path is short, the energy utilization rate is high, and compared with a traditional high-temperature gas heating method, the energy consumption is reduced by 20% or above.

Description

Technical Field

[0001] This invention relates to the field of gas drying, and more specifically, to a method for preparing a magnetic induction heating gas desiccant and its application. Background Technology

[0002] Gas drying is a fundamental process in industrial gas treatment. Moisture in industrial gases not only corrodes pipes and equipment but can also cause hydrate blockages and catalyst poisoning, seriously affecting process safety and efficiency. Adsorption separation technology, which selectively captures water molecules in gases using porous materials, is an important method for achieving gas drying.

[0003] Molecular sieves, due to their regular microporous structure and ideal surface properties, can achieve highly selective adsorption of water molecules through molecular-size sieving and polar interactions, making them widely used in industrial gas drying. However, the regeneration process of traditional molecular sieves relies on high-temperature gas heating, resulting in low thermal conductivity and high energy loss. Preparing novel molecular sieve materials and developing efficient thermal desorption technologies based on these materials are key to solving these problems.

[0004] Therefore, it is necessary to design a method for preparing a magnetic induction heating gas desiccant to solve the problems of low heat transfer efficiency and high energy loss in the traditional molecular sieve regeneration process, which relies on high-temperature gas heating. Summary of the Invention

[0005] In view of this, the present invention proposes a method for preparing a magnetic induction heating gas desiccant to solve the problems of low heat conduction efficiency and high energy loss in the traditional molecular sieve regeneration process, which relies on high-temperature gas heating.

[0006] On one hand, the present invention provides a method for preparing a magnetic induction heating gas desiccant, comprising the following preparation steps:

[0007] Metal / metal oxide nanoparticles were mixed with citric acid and ascorbic acid in water, ultrasonically dispersed, washed and dried to obtain modified metal / metal oxide nanoparticles.

[0008] The modified metal / metal oxide nanoparticles, molecular sieves, and binder are placed in water and stirred to obtain a slurry of magnetic induction heating gas desiccant.

[0009] The slurry is shaped and calcined to obtain the granular magnetic induction heating gas desiccant.

[0010] Furthermore, the metal / metal oxide nanoparticles are Fe3O4, γ-Fe2O3, CuFe2O4, Cu3Fe4O9, Mn x Zn 1-x Fe2O4 (0≤x≤1), Ni xZn 1-x Fe2O4 (0≤x≤1), Zn 1-x Mo x Fe2O4(0≤x≤1), CoFe2O4, Li 0- 5Fe 2-5 O4, Mg 1-x Ni x Fe2O4 (0≤x≤1), BaFe 12 O 19 One or more of the following: alloy powder, stainless steel.

[0011] Furthermore, the mass ratio of the metal / metal oxide nanoparticles, citric acid, and ascorbic acid is 5:(1-5):(1-5).

[0012] Furthermore, the molecular sieve is one or more of the following molecular sieves: LTA, FAU, ANA, CHA, MOR, HEU, NAT, BSV, ASV, PON, MFI, MEL, BEA, STO, AFN, ITT, SBE, SBS, and SBT.

[0013] Furthermore, the binder is one or more of the following: bentonite, kaolin, attapulgite, clay minerals, silica sol, alumina sol, aluminum dihydrogen phosphate, aluminate cement, water glass, phosphate cement, and ceramic clay.

[0014] Furthermore, the mass ratio of the modified metal / metal oxide nanoparticles to the molecular sieve and binder is (1-3):(4-10):(2-4).

[0015] Furthermore, the molding process specifically involves extrusion molding or ball rolling molding.

[0016] On the other hand, the present invention also provides the application of magnetic induction heating gas desiccant, wherein the magnetic induction heating gas desiccant is filled into a desiccant bed to dry industrial gas. After drying, the desiccant bed is placed in an induction coil, and then an alternating magnetic field is generated by passing electricity. The metal / metal oxide nanoparticles are heated by magnetic induction, causing the molecular sieve to desorb water molecules.

[0017] Furthermore, the industrial gases include hydrogen, air, and natural gas.

[0018] Furthermore, the frequency of the alternating magnetic field is 50Hz-10MHz, the power is 100-5000W, and the regeneration temperature is 100-550℃.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the magnetic induction heating gas desiccant prepared by the present invention has significant low energy consumption advantages in the field of industrial gas drying. It achieves in-situ heat generation through alternating magnetic field, with fast heating rate, short heat transfer path and high energy utilization rate, reducing energy consumption by more than 20% compared with traditional high temperature gas heating method. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 A flowchart illustrating the preparation method of the magnetic induction heating gas desiccant provided in an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] On the one hand, such as Figure 1 As shown in some embodiments of this application, a method for preparing a magnetic induction heating gas desiccant includes the following preparation steps:

[0027] Metal / metal oxide nanoparticles were mixed with citric acid and ascorbic acid in water, ultrasonically dispersed, washed and dried to obtain modified metal / metal oxide nanoparticles.

[0028] The modified metal / metal oxide nanoparticles, molecular sieves, and binder are placed in water and stirred to obtain a slurry of magnetic induction heating gas desiccant.

[0029] The slurry is shaped and calcined to obtain the granular magnetic induction heating gas desiccant.

[0030] Specifically, the ultrasonic dispersion time is 2 hours.

[0031] Specifically, metal / metal oxide nanoparticles, citric acid, and ascorbic acid are mixed in water, which is deionized water with a volume of 30 ml.

[0032] Specifically, when the modified metal / metal oxide nanoparticles, molecular sieves and binder are placed in water and stirred, the water is deionized water, the water temperature is 60°C, and the stirring time is 2 hours.

[0033] It is understood that the magnetic induction heating gas desiccant prepared by this invention has significant low energy consumption advantages in the field of industrial gas drying. It achieves in-situ heat generation through alternating magnetic fields, with fast heating rate, short heat transfer path and high energy utilization rate, reducing energy consumption by more than 20% compared with traditional high-temperature gas heating methods.

[0034] In some embodiments of this application, the metal / metal oxide nanoparticles are Fe3O4, γ-Fe2O3, CuFe2O4, Cu3Fe4O9, Mn x Zn 1-x Fe2O4 (0≤x≤1), Ni x Zn 1-x Fe2O4 (0≤x≤1), Zn 1-x Mo xFe2O4(0≤x≤1), CoFe2O4, Li 0-5 Fe 2-5 O4, Mg 1-x Ni x Fe2O4 (0≤x≤1), BaFe 12 O 19 One or more of the following: alloy powder, stainless steel.

[0035] Preferably, CoFe2O4

[0036] Specifically, the alloy powder includes: FeB 23 C 0.05 FeB 16 C 1.0 FeCo 35 FeCo 50 Ni 70 Fe 30 Ni 50 Fe 50 Ni 30 Fe 70 FeCr 55 FeMn 78 C 8.0 FeMn 82 C 1.0 FeMo 65 、FeSiAl.

[0037] Specifically, the stainless steel includes 316 stainless steel and 304 stainless steel.

[0038] Specifically, the metal / metal oxide nanoparticles have spherical, cubic, or spindle-shaped morphologies and a particle size of 3 nm-300 μm.

[0039] In some embodiments of this application, the mass ratio of the metal / metal oxide nanoparticles, citric acid, and ascorbic acid is 5:(1-5):(1-5). Preferably, it is 5:2:2.

[0040] In some embodiments of this application, the molecular sieve is one or more of the following molecular sieves: LTA, FAU, ANA, CHA, MOR, HEU, NAT, BSV, ASV, PON, MFI, MEL, BEA, STO, AFN, ITT, SBE, SBS, and SBT.

[0041] Specifically, the LTA molecules are of types 3A, 4A, and 5A; and the FAU molecules are of types 10X, 13X, and NaY.

[0042] The molecular sieve is preferably LTA, and more preferably 4A.

[0043] In some embodiments of this application, the binder is one or more of the following: bentonite, kaolin, attapulgite, clay minerals, silica sol, alumina sol, aluminum dihydrogen phosphate, aluminate cement, water glass, phosphate cement, and ceramic clay.

[0044] The preferred material is clay mineral.

[0045] In some embodiments of this application, the mass ratio of the modified metal / metal oxide nanoparticles to the molecular sieve and binder is (1-3):(4-10):(2-4); preferably 1:6:3.

[0046] In some embodiments of this application, the molding process specifically refers to extrusion molding or ball rolling molding.

[0047] Specifically, the particle size after molding is 3-5 mm, preferably 4 mm.

[0048] On the other hand, in some embodiments of this application, the application of a magnetic induction heating gas desiccant involves filling the desiccant into a desiccant bed to dry industrial gases. After drying, the desiccant bed is placed in an induction coil, and then an alternating magnetic field is generated by applying electricity. The metal / metal oxide nanoparticles are heated by magnetic induction, causing the molecular sieve to desorb water molecules. In some embodiments of this application, the industrial gases include hydrogen, air, and natural gas.

[0049] In some embodiments of this application, the industrial gas includes hydrogen, air, and natural gas.

[0050] In some embodiments of this application, the frequency of the alternating magnetic field is 50Hz-10MHz, the power is 100-5000W, and the regeneration temperature is 100-550℃; the frequency of the alternating magnetic field is preferably 10KHz, the power is preferably 500W, and the regeneration temperature is preferably 429℃.

[0051] Example 1

[0052] S1. Fe3O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified Fe3O4 nanoparticles.

[0053] S2. The Fe3O4 nanoparticles are combined with 3A molecular sieve and kaolin in a mass ratio of 1:6:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0054] S3 The slurry is extruded into strips with a particle size of 3mm, and then calcined to obtain granular magnetic induction heating gas desiccant.

[0055] Example 2

[0056] S1. CoFe2O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified CoFe2O4 nanoparticles.

[0057] S2. The CoFe2O4 nanoparticles are combined with 4A molecular sieve and clay mineral in a mass ratio of 1:6:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0058] S3 extrudes the slurry into strips with a particle size of 4 mm, and then calcines them to obtain granular magnetic induction heating gas desiccant.

[0059] Example 3

[0060] S1. NiFe2O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified NiFe2O4 nanoparticles.

[0061] S2. The NiFe2O4 nanoparticles are combined with 5A molecular sieve and water glass in a mass ratio of 1:6:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0062] S3 The slurry is extruded into strips with a particle size of 5 mm, and then calcined to obtain granular magnetic induction heating gas desiccant.

[0063] Example 4

[0064] S1. Fe3O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified Fe3O4 nanoparticles.

[0065] S2. The Fe3O4 nanoparticles are combined with 4A molecular sieve and kaolin in a mass ratio of 2:5:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0066] S3 The slurry is extruded into strips with a particle size of 3mm, and then calcined to obtain granular magnetic induction heating gas desiccant.

[0067] Example 5

[0068] S1. CoFe2O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified CoFe2O4 nanoparticles.

[0069] S2. The CoFe2O4 nanoparticles are combined with 5A molecular sieve and clay mineral in a mass ratio of 2:5:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0070] S3 extrudes the slurry into strips with a particle size of 4 mm, and then calcines them to obtain granular magnetic induction heating gas desiccant.

[0071] Example 6

[0072] S1. NiFe2O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified NiFe2O4 nanoparticles.

[0073] S2. The NiFe2O4 nanoparticles are combined with 3A molecular sieve and water glass in a mass ratio of 2:5:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0074] S3 The slurry is extruded into strips with a particle size of 5 mm, and then calcined to obtain granular magnetic induction heating gas desiccant.

[0075] Example 7

[0076] S1. Fe3O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified Fe3O4 nanoparticles.

[0077] S2. The Fe3O4 nanoparticles are combined with 5A molecular sieve and kaolin in a mass ratio of 3:4:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0078] S3 The slurry is extruded into strips with a particle size of 3mm, and then calcined to obtain granular magnetic induction heating gas desiccant.

[0079] Example 8

[0080] S1. CoFe2O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified CoFe2O4 nanoparticles.

[0081] S2. The CoFe2O4 nanoparticles are combined with 3A molecular sieve and clay mineral in a mass ratio of 3:4:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0082] S3 extrudes the slurry into strips with a particle size of 4 mm, and then calcines them to obtain granular magnetic induction heating gas desiccant.

[0083] Example 9

[0084] S1. NiFe2O4 nanoparticles, citric acid, and ascorbic acid were mixed in 30 mL of deionized water at a mass ratio of 5:2:2. After sonication for 2 hours, the mixture was washed and dried to obtain modified NiFe2O4 nanoparticles.

[0085] S2. The NiFe2O4 nanoparticles are combined with 4A molecular sieve and water glass in a mass ratio of 3:4:3 and stirred in deionized water at 60°C for 2 hours to obtain a slurry of magnetic induction heating gas desiccant.

[0086] S3 The slurry is extruded into strips with a particle size of 5 mm, and then calcined to obtain granular magnetic induction heating gas desiccant.

[0087] Effect test

[0088] The adsorbents from Examples 1-9 were used for drying air, hydrogen, and natural gas. 20g of each desiccant prepared in Examples 1-9 was packed into a bed. After the humid gas passed through the bed for 2 hours, desorption experiments were conducted using different heating methods. The desorption time was obtained by gas chromatography. The conditions and results are shown in Tables 1-3.

[0089] Table 1. Results of air desorption experiments using desiccants from Examples 1-9.

[0090]

[0091]

[0092] Table 2 shows the experimental results of hydrogen desorption by the adsorbents in Examples 1-9.

[0093]

[0094] Table 3 shows the desorption test results of the adsorbents for natural gas in Examples 1-9.

[0095]

[0096] It is evident that the adsorbents prepared in Examples 1-9 of this application are far more effective at desorption by magnetic induction heating than by hot nitrogen heating, with Example 3 exhibiting the shortest desorption time.

[0097] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a magnetic induction heating gas desiccant, characterized in that, The preparation steps include the following: Metal / metal oxide nanoparticles were mixed with citric acid and ascorbic acid in water, ultrasonically dispersed, washed and dried to obtain modified metal / metal oxide nanoparticles. The modified metal / metal oxide nanoparticles, molecular sieves, and binder are placed in water and stirred to obtain a slurry of magnetic induction heating gas desiccant. The slurry is shaped and calcined to obtain the granular magnetic induction heating gas desiccant.

2. The method for preparing the magnetic induction heating gas desiccant according to claim 1, characterized in that, The metal / metal oxide nanoparticles are Fe3O4, γ-Fe2O3, CuFe2O4, Cu3Fe4O9, and Mn. x Zn 1-x Fe2O4 (0≤x≤1), Ni x Zn 1-x Fe2O4 (0≤x≤1), Zn 1-x Mo x Fe2O4(0≤x≤1), CoFe2O4, Li 0-5 Fe 2-5 O4, Mg 1-x Ni x Fe2O4 (0≤x≤1), BaFe 12 O 19 One or more of the following: alloy powder, stainless steel.

3. The method for preparing the magnetic induction heating gas desiccant according to claim 2, characterized in that, The mass ratio of the metal / metal oxide nanoparticles, citric acid, and ascorbic acid is 5:(1-5):(1-5).

4. The method for preparing the magnetic induction heating gas desiccant according to claim 3, characterized in that, The molecular sieve is one or more of the following: LTA, FAU, ANA, CHA, MOR, HEU, NAT, BSV, ASV, PON, MFI, MEL, BEA, STO, AFN, ITT, SBE, SBS, and SBT.

5. The method for preparing the magnetic induction heating gas desiccant according to claim 4, characterized in that, The binder is one or more of the following: bentonite, kaolin, attapulgite, clay minerals, silica sol, alumina sol, aluminum dihydrogen phosphate, aluminate cement, water glass, phosphate cement, and ceramic clay.

6. The method for preparing the magnetic induction heating gas desiccant according to claim 5, characterized in that, The mass ratio of the modified metal / metal oxide nanoparticles to the molecular sieve and binder is (1-3):(4-10):(2-4).

7. The method for preparing the magnetic induction heating gas desiccant according to claim 6, characterized in that, The molding process specifically refers to extrusion molding or ball rolling molding.

8. The application of a method for preparing a magnetic induction heating gas desiccant as described in any one of claims 1-7, characterized in that, The magnetic induction heating gas desiccant is filled into a desiccant bed to dry industrial gases. After drying, the desiccant bed is placed in an induction coil, and then an alternating magnetic field is generated by energizing. The metal / metal oxide nanoparticles are heated by magnetic induction, causing the molecular sieve to desorb water molecules.

9. The application according to claim 8, characterized in that, The industrial gases include hydrogen, air, and natural gas.

10. The application according to claim 8, characterized in that, The alternating magnetic field has a frequency of 50Hz-10MHz, a power of 100-5000W, and a regeneration temperature of 100-550℃.

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