Induction heating type pulse heating and chemical reaction device

Abstract

The utility model relates to the technical field of thermal chemical industry, in particular to an induction heating type pulse heating and chemical reaction device which comprises a heat exchange cavity and a fixed bed reactor, the fixed bed reactor is vertically arranged on the heat exchange cavity in a penetrating mode, and a catalyst layer is fixed in the fixed bed reactor located in the heat exchange cavity. A temperature measuring system is also mounted outside the fixed bed reactor; the fixed bed reactor is provided with a gas inlet at the bottom and a gas outlet at the top; an induction heating coil is also mounted on the outer wall of the fixed bed reactor at the catalyst layer, and is electrically connected with a control circuit. Based on the electromagnetic induction principle, through instantaneous heating of the induction heating coil, the problems that the temperature of a catalyst cannot be accurately controlled and the reaction efficiency is low are solved, the problems of heat loss and heating temperature gradient in a traditional heating mode are effectively avoided, the energy utilization efficiency in the thermocatalysis process is improved, and the energy consumption is reduced. The high-flux chemical reaction is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal chemical engineering, in particular to an induction heating type pulse heating and chemical reaction device. Background Art

[0002] Catalytic reactions play a vital role in the chemical and energy industries and are widely used in the utilization and transformation of fossil raw materials such as petroleum, natural gas, and coal, decarbonization and emission reduction in the chemical industry, and hydrogen production by electrolysis of water. For the majority of thermal chemical processes, thermal catalytic reactors provide the necessary heat to activate catalysts and reactant molecules, accelerate the rate of chemical reactions, and thus improve the production efficiency of the catalytic process. Obviously, the optimal design of thermal chemical reactors is of great significance for promoting the development of the chemical industry, improving product quality, reducing production costs, protecting the environment, and achieving sustainable development.

[0003] Fixed bed reactors, fluidized bed reactors, and ebullating bed reactors are widely used in traditional thermal chemical industries. Compared with fluidized bed reactors and ebullating bed reactors, fixed bed reactors have at least the following advantages: the catalyst in the fixed bed reactor is filled in the reactor, has a large surface area, and can efficiently catalyze the reaction; the operation of the fixed bed reactor is relatively simple, and it is easy to achieve continuous production, which is suitable for large-scale industrial applications; the fixed bed reactor can control the reaction temperature by external heating or cooling to keep the reaction conditions relatively stable; due to the gaps between the catalyst particles, the fixed bed reactor usually has a lower pressure drop, which is conducive to reducing energy consumption; the fixed bed reactor is suitable for gas-solid, liquid-solid or gas-liquid-solid multiphase reactions, has good applicability and is easy to replace the catalyst; because the temperature distribution inside the fixed bed reactor is relatively uniform, it can reduce the formation of hot spots or cold spots, thereby reducing the occurrence of side reactions.

[0004] Chinese patent CN220803143U discloses several designs of tubular fixed bed reactors in the field of catalytic thermal chemical industry, which preliminarily realizes the precise control of temperature during thermal catalytic reaction. The reactor is easy to manufacture, simple to operate, and has high reaction efficiency. Chinese patent CN118083914A discloses a thermal chemical synthesis method using an electrically heated fixed bed, in which electric heating is used to control the reaction temperature, which greatly solves the problem of by-products of hydrochloric acid and hydrogen chloride in organic fluorine-chlorine exchange reactions.

[0005] In general, thermal chemical reactors are developing in a more efficient, environmentally friendly and intelligent direction to meet increasingly stringent industrial needs and environmental standards. The existing technology still has the problem of high heat loss caused by external heating and low heating efficiency of thermal chemical reactors. In addition, due to the inherent differences in heat transfer properties of different materials, temperature gradients are prone to exist inside existing reactors, which is not conducive to improving the selectivity of thermal catalytic reactions. Furthermore, thermal catalytic reactions are often accompanied by the release or absorption of a large amount of heat, which causes fluctuations in the actual reaction temperature inside existing thermal chemical reactors. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of the utility model is to propose an induction heating pulse heating and chemical reaction device, which is based on the principle of electromagnetic induction and solves the problems of the inability to accurately control the catalyst temperature and low reaction efficiency through instantaneous heating of the induction heating coil, and effectively avoids the problems of heat loss and heating temperature gradient in traditional heating methods, improves the energy utilization efficiency in the thermal catalytic process, and realizes high-throughput chemical reactions.

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

[0008] An induction heating pulse heating and chemical reaction device, comprising a heat exchange cavity and a fixed bed reactor, wherein the fixed bed reactor is vertically arranged on the heat exchange cavity, a catalyst layer is fixed in the fixed bed reactor located in the heat exchange cavity, and a temperature measurement system is also installed outside the fixed bed reactor;

[0009] The fixed bed reactor is provided with an air inlet at the bottom and an air outlet at the top; an induction heating coil is also installed on the outer wall of the fixed bed reactor located at the catalyst layer, and the induction heating coil is electrically connected to a control circuit.

[0010] Preferably, plugs installed at both ends of the catalyst layer are fixed in the fixed bed reactor, the air inlet and the air outlet of the fixed bed reactor are connected with a tee, and solenoid valves are installed at both side ports of the tee.

[0011] Preferably, the catalyst layer is a porous monolithic structure consisting of a heating substrate and a powdered catalyst.

[0012] Preferably, a circulation pump is installed on the water inlet of the side wall of the heat exchange cavity, and a water outlet is also provided on the top of the heat exchange cavity.

[0013] Preferably, the temperature measurement system comprises an infrared temperature measurement probe arranged on the fixed bed reactor, a first thermocouple fixed on the inner side of the heat exchange cavity, a second thermocouple fixed at the air inlet, and a third thermocouple fixed at the air outlet.

[0014] Preferably, the control circuit comprises an induction heating power supply electrically connected to the induction heating coil, the induction heating power supply is electrically connected to a relay, the relay is electrically connected to a single-chip microcomputer, and the single-chip microcomputer is electrically connected to the solenoid valve and the circulation pump.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] (1) The fixed bed reactor of the utility model adopts electromagnetic induction heating technology to perform contactless electromagnetic induction heating on the catalyst layer, thereby realizing self-heating of the catalyst layer and avoiding heat loss in the heat transfer heating process of the prior art. At the same time, electromagnetic induction heating has a skin effect, which greatly improves the efficiency of electric energy utilization. The self-heating effect of the uniformly heated substrate effectively avoids the temperature gradient commonly found in the prior art and improves the temperature uniformity of the catalyst layer.

[0017] (2) The utility model provides a temperature measurement system and a control circuit, which makes the electromagnetic induction heating process simple to control, with high accuracy and fast temperature response speed, which is very beneficial to the real-time intelligent and precise control of the catalyst temperature; electromagnetic induction heating can heat to a higher temperature in a short time, greatly accelerating the kinetic process of the reaction, which is beneficial to improving the reaction efficiency and thus realizing high-throughput chemical reactions.

[0018] (3) When cooling is required, the device of the utility model can be cooled by introducing gas into the fixed bed reactor and using a temperature control system for real-time temperature control. Alternatively, gas cooling and the introduction of a cooling medium into the heat exchange chamber can be used for rapid cooling to achieve extremely fast heat dissipation rates and rapid temperature reduction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an induction heating pulse heating and chemical reaction device proposed by the utility model;

[0020] Figure 2 The utility model discloses a cross-sectional structural diagram of an induction heating pulse heating and chemical reaction device.

[0021] In the figure: wherein: 100, fixed bed reactor; 102, air inlet; 103, air outlet; 104, plug; 105, tee; 106, solenoid valve; 200, catalyst layer; 300, heat exchange cavity; 303, circulation pump; 401, infrared thermometer; 402, first thermocouple; 403, second thermocouple; 404, third thermocouple; 507, single chip microcomputer; 508, relay; 509, heating power supply. DETAILED DESCRIPTION

[0022] 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.

[0023] Example

[0024] like Figure 1-2 As shown, an induction heating pulse heating and chemical reaction device includes a heat exchange cavity 300 and a fixed bed reactor 100. The fixed bed reactor 100 is vertically arranged on the heat exchange cavity 300. A catalyst layer 200 is fixed in the fixed bed reactor 100 located in the heat exchange cavity 300. A temperature measurement system is also installed outside the fixed bed reactor 100.

[0025] The fixed bed reactor 100 is provided with an air inlet 102 at the bottom and an air outlet 103 at the top; an induction heating coil 600 is also installed on the outer wall of the fixed bed reactor 100 located at the catalyst layer 200, and the induction heating coil 600 is electrically connected to a control circuit.

[0026] The control circuit controls the heating power and time of the induction heating coil 600. After the induction heating coil 600 is powered on, the catalyst layer 200 realizes contactless self-heating, and the self-heating effect of the uniform heating substrate effectively avoids the temperature gradient during heating, and improves the temperature uniformity of the catalyst layer 200. It should be noted that the fixed bed reactor 100 is an insulator, and the material of the fixed bed reactor 100 is selected from one of quartz, corundum, and boron nitride; the heat exchange cavity 300 can be filled with heat-conducting gas or heat-conducting liquid for cooling.

[0027] In this embodiment, plugs 104 installed at both ends of the catalyst layer 200 are fixed in the fixed bed reactor 100, and the air inlet 102 and the air outlet 103 of the fixed bed reactor 100 are connected to a tee 105, and solenoid valves 106 are installed on both sides of the tee 105.

[0028] The plug 104 is used to position and fix the catalyst layer 200. Furthermore, the setting of the plug 104 will not affect the passage of gas in the fixed bed reactor 100, and a frame structure can be adopted; the air inlet 102 and the air outlet 103 of the fixed bed reactor 100 are both connected to a tee 105, and the solenoid valves 106 on both sides of the tee 105 can control the flow of the incoming gas.

[0029] In this embodiment, the catalyst layer 200 is a porous integral structure consisting of a heating substrate and a powder catalyst.

[0030] The catalyst layer 200 is composed of a heating substrate and a powdered catalyst. The heating substrate is selected from one or more of carbon paper, carbon cloth, carbonized biomass, carbonized wood, honeycomb graphite, carbon microspheres, foam metal, powdered sintered metal, metal wire, mesh, mesh column, metal shavings ball, and metal microspheres. The catalyst layer 200 is configured as a porous integral structure, which can increase the uniformity of contact between reactants and improve the reaction effect.

[0031] In this embodiment, a circulation pump 303 is installed on the water inlet of the side wall of the heat exchange cavity 300 , and a water outlet 302 is also provided on the top of the heat exchange cavity 300 .

[0032] The side wall of the heat exchange cavity 300 is provided with a water inlet and a water outlet 302, and the circulating pump 303 is used to control the heat exchange flow rate. When cooling is required, cooling gas is first introduced into the fixed bed reactor 100 through the air inlet 102 to control the temperature and speed of the inlet gas, and the heat is taken away by the introduced gas. When the required temperature cannot be reached within a specific time, heat-conducting gas or heat-conducting liquid is introduced into the heat exchange cavity 300 for forced cooling. The heat-conducting gas can be hydrogen or argon, and the heat-conducting liquid can be water, salt water or silicone oil.

[0033] In this embodiment, the temperature measurement system includes an infrared temperature measurement probe 401 arranged on the fixed bed reactor 100, a first thermocouple 402 fixed on the inner side of the heat exchange cavity 300, a second thermocouple 403 fixed at the air inlet 102, and a third thermocouple 404 fixed at the air outlet 103.

[0034] The infrared temperature probe 401 is used to measure the temperature of the fixed bed reactor 100, and the first thermocouple 402 is used to monitor the temperature near the induction heating coil 100, evaluate the cooling effect of the heat exchanger, and facilitate the adjustment of the heat exchange flow; the infrared temperature probe 401 and the induction heating coil 100 control the heating rate and the maximum heating temperature during heating, the first thermocouple 402 and the circulation pump 303 control the cooling speed after heating and the lowest temperature that can be lowered to, the second thermocouple 403 is used to monitor the temperature of the gas introduced during cooling, and the third thermocouple 404 is used to monitor the temperature of the gas outlet 103 during cooling, and evaluate the air cooling effect.

[0035] In this embodiment, the control circuit includes an induction heating power supply 509 electrically connected to the induction heating coil 600, the induction heating power supply 509 is electrically connected to a relay 508, the relay 508 is electrically connected to a single-chip microcomputer 507, and the single-chip microcomputer 507 is electrically connected to the solenoid valve 106 and the circulation pump 303.

[0036] The single chip computer 507 can simultaneously control the electromagnetic valve 106, the circulating pump 506, the relay 508 and the induction heating power supply 509. The single chip computer 507 controls the heating power of the induction heating power supply 509 through the relay 508, so that the program-controlled pulse process heating rate is 500℃ / min~1000000℃ / min. By controlling the electromagnetic valve 106 and the circulating pump 303, the cooling rate can reach 10℃ / min~100000℃ / min, and the time control accuracy is 1us~1h.

[0037] The working principle of the induction heating pulse heating and chemical reaction device of the utility model is as follows:

[0038] When in use, the single chip microcomputer 507 is used to precisely control the power supply to the induction heating coil 600, so as to realize contactless instantaneous heating of the catalyst layer 200 in the fixed bed reactor 100, and quickly heat up. The reaction gas is introduced into the air inlet 102 at the bottom of the fixed bed reactor 100 to react with the catalyst. The instantaneous heating avoids the heat loss in the heat transfer heating process and improves the reaction effect. When the reaction is completed and cooling is required, the cooling reaction gas is introduced into the fixed bed reactor 100 through the air inlet 102, and the temperature and speed of the intake air are controlled by monitoring the temperature measurement system, and the heat is taken away by the introduced gas. When rapid cooling cannot be achieved within a specific time, on the basis of air cooling, a heat-conducting gas or a heat-conducting liquid is further introduced into the heat exchange cavity 300, and the heat exchange flow is controlled by the circulating pump 303 to achieve the heat exchange forced cooling effect.

[0039] 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. An induction heating pulse heating and chemical reaction device, comprising a heat exchange cavity (300) and a fixed bed reactor (100), characterized in that: The fixed bed reactor (100) is vertically penetrated on the heat exchange cavity (300), a catalyst layer (200) is fixed in the fixed bed reactor (100) located in the heat exchange cavity (300), and a temperature measurement system is also installed outside the fixed bed reactor (100); The fixed bed reactor (100) is provided with an air inlet (102) at the bottom and an air outlet (103) at the top; an induction heating coil (600) is also installed on the outer wall of the fixed bed reactor (100) located at the catalyst layer (200), and the induction heating coil (600) is electrically connected to a control circuit.

2. The induction heating pulse heating and chemical reaction device according to claim 1, characterized in that: The fixed bed reactor (100) is provided with plugs (104) fixedly mounted at both ends of the catalyst layer (200), the air inlet (102) and the air outlet (103) of the fixed bed reactor (100) are both connected with a tee (105), and solenoid valves (106) are installed at both side ports of the tee (105).

3. The induction heating pulse heating and chemical reaction device according to claim 1, characterized in that: The catalyst layer (200) is a porous integral structure consisting of a heating substrate and a powdered catalyst.

4. The induction heating pulse heating and chemical reaction device according to claim 1, characterized in that: A circulation pump (303) is installed on the water inlet of the side wall of the heat exchange cavity (300), and a water outlet (302) is also provided on the top of the heat exchange cavity (300).

5. The induction heating pulse heating and chemical reaction device according to claim 1, characterized in that: The temperature measurement system comprises an infrared temperature measurement probe (401) arranged on the fixed bed reactor (100), a first thermocouple (402) fixed on the inner side of the heat exchange cavity (300), a second thermocouple (403) fixed at the air inlet (102), and a third thermocouple (404) fixed at the air outlet (103).

6. The induction heating pulse heating and chemical reaction device according to claim 1, characterized in that: The control circuit comprises an induction heating power supply (509) electrically connected to the induction heating coil (600), the induction heating power supply (509) is electrically connected to a relay (508), the relay (508) is electrically connected to a single-chip microcomputer (507), and the single-chip microcomputer (507) is electrically connected to a solenoid valve (106) and a circulation pump (303).

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