Fluidized bed reactor for heating powder through electromagnetic induction

By setting induction coils outside the fluidized bed reactor and using heating substrates, the application of electromagnetic induction heating technology in fluidized bed reactors is realized, the heat loss and temperature unevenness in traditional heating methods are solved, and the heating efficiency and catalytic reaction efficiency are improved.

CN222739129UActive Publication Date: 2025-04-11HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202421545286.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-02
Publication Date
2025-04-11
Estimated Expiration
2034-07-02

AI Technical Summary

Technical Problem

During the heating process, traditional fluidized bed reactors have problems such as long heat transfer paths, large heat loss and uneven temperature distribution, which makes the reaction conditions difficult to accurately control, and the potential of the prior art in energy conservation and emission reduction is approaching the limit.

Method used

Using electromagnetic induction heating technology, an induction coil is installed outside the reactor to achieve fast and uniform heating. Combined with the heating matrix, the heating matrix can improve thermal conductivity, and the length of the heating matrix and the flow rate of the intake air can be flexibly adjusted to achieve thermal shock transient high-temperature powder heating.

Benefits of technology

It reduces the loss of heat during the transfer process, improves the efficiency of energy utilization, reduces the average thermal catalytic energy consumption, achieves rapid and uniform heating of powder, and improves the efficiency and yield of catalytic reactions.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of thermochemical engineering, in particular to a fluidized bed reactor for electromagnetic induction heating of powder, which comprises a fluidized bed, the lower end of the fluidized bed is communicated with a sample injector, and the upper end of the fluidized bed is communicated with a sample storage device; the fluidized bed comprises a reaction cavity, and an air distribution plate is fixed in an air inlet in the bottom of the reaction cavity; the bottom of the reaction cavity is connected with an air inlet pipeline through a joint, and the top of the reaction cavity is covered with a cap; a heating base body is fixed on the middle section of the inner wall of the reaction cavity; and an induction coil is sleeved on the outer wall of the reaction cavity at the heating base body. According to the utility model, the induction coil is arranged outside the reaction cavity, so that rapid and uniform heating is realized, the problems of heat loss and non-uniform temperature in a traditional heating mode are effectively avoided, and thermal shock type powder fluidization transient heating which cannot be realized in the prior art can be realized.
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Description

Technical Field

[0001] The utility model relates to the technical field of thermal chemical engineering, in particular to a fluidized bed reactor for electromagnetic induction heating of powders. Background Art

[0002] Catalytic reactions play a vital role in many fields such as chemical industry, energy conversion, and environmental protection. In particular, in the processes of petrochemicals, natural gas processing, comprehensive utilization of coal, and environmental governance such as desulfurization and denitrification, the use of efficient catalysts can significantly increase reaction rates and product selectivity, and reduce energy consumption and production costs.

[0003] Traditional fluidized bed reactors are widely used in catalytic reactions. Their working principle is to use the flow of gas or liquid to suspend solid catalysts to form a fluid-like state, thereby increasing the contact area between reactants and catalysts and improving reaction efficiency. Fluidized bed reactors are popular in the chemical industry and energy conversion fields mainly due to their series of comprehensive advantages. These advantages include their excellent heat transfer efficiency, which is due to the turbulent state of particles under the action of fluid, greatly expanding the heat transfer area; temperature uniformity, due to the continuous movement of particles, reducing the risk of local overheating or overcooling, ensuring the stability of reaction conditions; and good mixing performance, ensuring sufficient contact between reactants and catalysts, thereby improving reaction rate and product consistency.

[0004] In general, fluidized bed reactors have high energy efficiency and low energy consumption, but these traditional technologies have some limitations, such as thermal efficiency issues. Traditional fluidized bed reactors usually use external heating methods, such as electric heating and steam heating, which have problems such as long heat transfer paths and large heat losses. The temperature distribution inside the reactor is often uneven, making it difficult to accurately control the reaction conditions. The potential of existing technologies in energy conservation and emission reduction has reached its limit, and more efficient and environmentally friendly reactor technologies need to be developed.

[0005] In view of the above problems, in recent years, electromagnetic induction heating technology has attracted attention due to its high heating efficiency and good temperature control ability. Electromagnetic induction heating uses eddy currents generated by alternating magnetic fields to heat materials, and has the advantages of fast heating speed, high thermal efficiency, and precise temperature control. However, the application of electromagnetic induction heating technology in fluidized bed reactors, especially in the heating of powders, still faces technical challenges. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of the utility model is to propose a fluidized bed reactor for electromagnetic induction heating of powders. By arranging an induction coil outside the reaction chamber, rapid and uniform heating is achieved, effectively avoiding the heat loss and temperature unevenness problems in traditional heating methods, and realizing thermal shock-type powder fluidization transient heating that cannot be achieved by the prior art.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A fluidized bed reactor for electromagnetic induction heating of powders, comprising a fluidized bed, wherein the lower end of the fluidized bed is connected to a sample injector, and the upper end of the fluidized bed is connected to a sample storage device;

[0009] The fluidized bed comprises a reaction chamber, an air distribution plate is fixed in the air inlet at the bottom of the reaction chamber; the bottom of the reaction chamber is connected to an air inlet pipe through a joint, and the top of the reaction chamber is covered with a cap;

[0010] A heating substrate is fixed in the middle section of the inner wall of the reaction chamber; an induction coil is sleeved on the outer wall of the reaction chamber located at the heating substrate.

[0011] Preferably, the heating substrate is tubular, and a support sleeve is fixed to the bottom of the heating substrate. The outer wall of the heating substrate and the support sleeve are both arranged in contact with the inner wall of the reaction chamber; the top of the support sleeve is in contact with the bottom of the heating substrate, and the bottom of the support sleeve is in contact with the top of the air distribution plate, and the injector passes through the reaction chamber and is connected to the support sleeve.

[0012] Preferably, a groove is provided on the top of the heating substrate, and a protrusion is provided on the inner wall of the reaction chamber, and the groove is matched with the protrusion.

[0013] Preferably, the injector comprises an injector cavity, the lower end of the injector cavity is connected with an injection tube, the other end of the injection tube passes through the reaction cavity and is connected with a supporting sleeve; the upper cover of the injector cavity is provided with a sealed cover.

[0014] Preferably, the sample storage device comprises a sample storage device cavity, a side wall of the sample storage device cavity is connected with a sample storage tube, and the other end of the sample storage tube is connected with the upper end of the reaction cavity; the upper cover of the sample storage device cavity is provided with a porous cover.

[0015] Preferably, a flow control valve is installed on the air intake pipe.

[0016] Preferably, the inner diameter of the sample injection tube is smaller than the inner diameter of the reaction chamber.

[0017] Preferably, the inner diameter of the sample storage tube is larger than the inner diameter of the reaction chamber.

[0018] Preferably, the reaction chamber is an insulator, and the heating substrate is a conductor.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] (1) The fluidized bed reactor of the utility model adopts electromagnetic induction heating technology. By setting an induction coil outside the reactor, rapid and uniform heating is achieved, which reduces the loss of heat during the heat transfer process, improves the energy utilization efficiency, and reduces the average thermal catalytic energy consumption by 10% to 35%; in conjunction with the heating substrate, the thermal conductivity efficiency is improved, and the length of the heating substrate and the flow rate of the intake air can be flexibly adjusted to achieve continuous and rapid flow of powder from the high-temperature zone, thereby realizing thermal shock-type transient high-temperature powder heating, greatly improving the synthesis efficiency or catalytic reaction flux of the powder, and further improving the yield of the powder catalytic product.

[0021] (2) The length of the heating substrate of the utility model can be flexibly adjusted. When the heating substrate is longer, a wide constant temperature zone can be formed; when the heating substrate is shorter, the powder flow rate can be controlled by the air intake to form thermal shock type transient high temperature heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a fluidized bed reactor for electromagnetic induction heating of powders proposed by the utility model;

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of a fluidized bed of a fluidized bed reactor for electromagnetic induction heating of powders proposed by the utility model;

[0024] Figure 3 The utility model discloses a schematic diagram of a heating base structure of a fluidized bed reactor for electromagnetic induction heating of powders.

[0025] In the figure: wherein: 100, fluidized bed; 200, sample injector; 300, sample storage; 101, reaction chamber; 102, flow control valve; 103, joint; 104, air distribution plate; 105, cap; 106, induction coil; 107, heating substrate; 108, support sleeve; 109, air inlet pipe; 110, groove; 111, protrusion; 201, sample injector chamber; 202, airtight cover; 203, sample injection tube; 301, sample storage chamber; 302, porous cover; 303, sample storage tube. DETAILED DESCRIPTION

[0026] 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 part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0027] Example

[0028] like Figure 1-Figure 3 As shown, a fluidized bed reactor for electromagnetic induction heating of powders comprises a fluidized bed 100, wherein the lower end of the fluidized bed 100 is connected to a sample injector 200, and the upper end of the fluidized bed 100 is connected to a sample storage 300;

[0029] The fluidized bed 100 includes a reaction chamber 101, an air distribution plate 104 is fixed in the air inlet at the bottom of the reaction chamber 101; the bottom of the reaction chamber 101 is connected to an air inlet pipe 109 through a joint 103, and the top of the reaction chamber 101 is covered with a cap 105; a heating substrate 107 is fixed in the middle section of the inner wall of the reaction chamber 101; an induction coil 106 is sleeved on the outer wall of the reaction chamber 101 located at the heating substrate 107.

[0030] The sample injector 200 is used to introduce untreated powder, the reaction chamber 101 is used to heat the incoming powder, and the sample storage 300 is used to store the powder after heat treatment; the air inlet pipe 109 is used to introduce gas, and a cap 105 is provided on the top of the reaction chamber 101 so that the treated powder can smoothly enter the sample storage 300, the air distribution plate 104 is used to disperse the gas so that the gas forms laminar flow and turbulent flow, the heating substrate 107 is used for heat conduction, and the induction coil 106 is used for electrical heating. It should be noted that the induction heating coil can be set to a spiral cylindrical shape, and the two ends of the induction coil 106 are connected to a power supply to energize it and generate heat. The powder can be a catalyst powder or other chemical powder.

[0031] In this embodiment, the heating base 107 is tubular, and a support sleeve 108 is fixed to the bottom of the heating base 107. The outer walls of the heating base 107 and the support sleeve 108 are both arranged in contact with the inner wall of the reaction chamber 101; the top of the support sleeve 108 is in contact with the bottom of the heating base 107, and the bottom of the support sleeve 108 is in contact with the top of the air distribution plate 104, and the injector 200 passes through the reaction chamber 101 and is connected with the support sleeve 108.

[0032] The support sleeve 108 is used to support the heating base 107. Both the heating base 107 and the support sleeve 108 are tubular and are arranged to fit the inner wall of the reaction chamber 101. The powder entering from the injector 200 rises as the gas passes through the inside of the support sleeve 108 under the action of the gas introduced from the ventilation pipe 109, and is heated inside the heating base 107. After heating, the powder enters the sample storage device 300.

[0033] In this embodiment, a groove 110 is provided on the top of the heating substrate 107 , and a protrusion 111 is provided on the inner wall of the reaction chamber 101 , and the groove 110 is matched with the protrusion 111 .

[0034] The groove 110 is matched with the protrusion 111 to fix the top of the heating substrate 107 .

[0035] In this embodiment, the injector 200 includes an injector cavity 201, the lower end of the injector cavity 201 is connected to an injection tube 203, and the other end of the injection tube 203 passes through the reaction cavity 101 and is connected to the support sleeve 108; the upper cover of the injector cavity 201 is provided with a sealed cover 202.

[0036] The sample injector cavity 201 can be used to put unprocessed powder, and the powder enters the support tube sleeve 108 of the reaction cavity 100 through the sample injection tube 203. Further, a flow control valve can be provided on the sample injection tube 203 to control the powder flow.

[0037] In this embodiment, the sample storage device 300 includes a sample storage device cavity 301 , a sample storage tube 303 is connected to the side wall of the sample storage device cavity 301 , and the other end of the sample storage tube 303 is connected to the upper end of the reaction cavity 101 ; the upper cover of the sample storage device cavity 301 is provided with a porous cover 302 .

[0038] The sample storage cavity 301 is used to store the powder after the heating treatment, and the porous cover 302 is used to separate the gas from the solid so that the gas can be discharged from the sample storage cavity 301.

[0039] In this embodiment, a flow control valve 102 is installed on the air intake pipe 109. The flow control valve 102 is used to control the intake air flow rate.

[0040] In this embodiment, the inner diameter of the injection tube 203 is smaller than the inner diameter of the reaction chamber 101 .

[0041] In this embodiment, the inner diameter of the sample storage tube 303 is larger than the inner diameter of the reaction chamber 101 .

[0042] In this embodiment, the reaction chamber 101 is an insulator, and the heating substrate 107 is a conductor.

[0043] The reaction chamber 101 is made of quartz, corundum or boron nitride, and the heating substrate 107 is made of carbon fiber, graphite or metal. The heating substrate can be set as a porous tube structure to improve the thermal conductivity. The length of the heating substrate 106 can be flexibly adjusted. When it is longer, a wide constant temperature zone can be formed; when it is shorter, the powder flow rate can be controlled to form thermal shock transient high temperature heating, and the heating rate of transient heating is not less than 200℃ / min.

[0044] The working principle of the fluidized bed reactor of the utility model, which is a kind of electromagnetic inductor for heating powder, is as follows:

[0045] When in use, the induction coil 106 is energized to generate thermal shock type transient high temperature heating, the air inlet pipe 109 is opened to introduce gas, the gas flow is controlled by the flow control valve 102, and the gas is distributed through the distribution plate 104 after entering. The powder is introduced into the support sleeve 108 of the reaction chamber 100 through the injection tube 203 of the injector 200, and undergoes high temperature heating reaction in the high temperature zone when passing through the heating substrate 107 together with the entering gas. Subsequently, the powder that has completed the heating reaction enters the sample storage cavity 301 at the upper end of the reaction cavity 101 together with the gas, and the gas is discharged from the sample storage cavity 301 by the porous cover 302, and the powder is stored in the sample storage cavity 301.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fluidized bed reactor for electromagnetic induction heating of powders, comprising a fluidized bed (100), characterized in that: The lower end of the fluidized bed (100) is connected to a sample injector (200), and the upper end of the fluidized bed (100) is connected to a sample storage (300); The fluidized bed (100) comprises a reaction chamber (101), wherein an air distribution plate (104) is fixed in an air inlet at the bottom of the reaction chamber (101); the bottom of the reaction chamber (101) is connected to an air inlet pipe (109) via a joint (103), and the top of the reaction chamber (101) is covered with a cap (105); a heating substrate (107) is fixed in the middle section of the inner wall of the reaction chamber (101); and an induction coil (106) is sleeved on the outer wall of the reaction chamber (101) located at the heating substrate (107).

2. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 1, characterized in that: The heating substrate (107) is tubular, and a support sleeve (108) is fixed at the bottom of the heating substrate (107). The outer walls of the heating substrate (107) and the support sleeve (108) are both arranged in contact with the inner wall of the reaction chamber (101); the top of the support sleeve (108) is in contact with the bottom of the heating substrate (107), and the bottom of the support sleeve (108) is in contact with the top of the air distribution plate (104); the sample injector (200) passes through the reaction chamber (101) and is connected with the support sleeve (108).

3. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 1, characterized in that: The top of the heating substrate (107) is provided with a groove (110), the inner wall of the reaction chamber (101) is provided with a protrusion (111), and the groove (110) is matched with the protrusion (111).

4. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 1, characterized in that: The injector (200) comprises an injector cavity (201), the lower end of the injector cavity (201) is connected to an injection tube (203), the other end of the injection tube (203) passes through the reaction cavity (101) and is connected to a support sleeve (108); the upper cover of the injector cavity (201) is provided with a sealed cover (202).

5. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 1, characterized in that: The sample storage device (300) comprises a sample storage device cavity (301), a side wall of the sample storage device cavity (301) is connected with a sample storage tube (303), and the other end of the sample storage tube (303) is connected with the upper end of the reaction cavity (101); the upper cover of the sample storage device cavity (301) is provided with a porous sealing cover (302).

6. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 1, characterized in that: A flow control valve (102) is installed on the air intake pipeline (109).

7. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 4, characterized in that: The inner diameter of the sample injection tube (203) is smaller than the inner diameter of the reaction chamber (101).

8. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 5, characterized in that: The inner diameter of the sample storage tube (303) is greater than the inner diameter of the reaction chamber (101).

9. The fluidized bed reactor for electromagnetic induction heating of powders according to claim 1, characterized in that: The reaction chamber (101) is an insulator, and the heating substrate (107) is a conductor.