Temperature control system for a high-temperature catalytic cracking furnace of methane

Abstract

The utility model relates to the field of methane cracking control equipment especially is temperature control system of methane high temperature catalytic cracking furnace. The control system includes the cracking furnace, heater A, temperature sensor, heater B, regenerator, power regulator, controlling means, heater A is wrapped on the outer wall of cracking furnace, and temperature sensor is located in the cracking furnace, and the tail gas exhaust of cracking furnace, regenerator, heater B cracking furnace's entrance are connected together in proper order through the pipeline, and power regulator and temperature sensor all are with controlling means communication connection, heater B is with power regulator communication connection, and controlling means is with several temperature sensing mechanism communication connection. The utility model discloses through the recovery to cracking tail gas waste heat and the intelligent adjustment of controlling device to the heating power of heater to realize the intelligent temperature control of gas solid two -phase flow in cracking furnace, thereby realizes the efficient cracking of methane under the action of catalyst, thereby reduced the production cost of carbon nanotube.

Description

Technical Field

[0001] This utility model relates to the field of methane cracking control equipment, and in particular to the temperature control system of a high-temperature catalytic cracking furnace for methane. Background Technology

[0002] Carbon nanotubes, as an emerging material in the field of nanotechnology, are widely used in electronics, energy storage, biomedicine, and composite materials. Currently, the main production route for carbon nanotubes uses natural gas and propylene as raw materials and fixed-bed reactors as production equipment. However, this approach suffers from low catalytic cracking efficiency, low production efficiency, complex equipment, high energy consumption, and the inability to achieve large-scale continuous production. To overcome the efficiency limitations of traditional fixed-bed reactors, fluidized-bed reactors have been explored and researched. However, these reactors face technical challenges such as intelligent temperature control within the reaction chamber and waste heat recovery and reuse. Utility Model Content

[0003] The technical problem this invention aims to solve is: to address the technical problems described in the background art, this invention provides a temperature control system for a high-temperature catalytic cracking furnace for methane. By recovering the waste heat from the cracking tail gas and intelligently adjusting the heating power of the heater using a control device, intelligent temperature control of the gas-solid two-phase flow inside the cracking furnace is achieved, thereby realizing efficient cracking of methane under the action of a catalyst and reducing the production cost of carbon nanotubes.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A temperature control system for a high-temperature catalytic cracking furnace of methane includes a cracking furnace, a heater A, a temperature sensor, a heater B, a regenerator, a power regulator, and a control device. The heater A is wrapped around the outer wall of the cracking furnace, the temperature sensor is located inside the cracking furnace, the tail gas outlet of the cracking furnace, the regenerator, and the inlet of the cracking furnace (heater B) are connected together in sequence through pipelines, the power regulator and the temperature sensor are both communicatively connected to the control device, the heater B is communicatively connected to the power regulator, and the control device is communicatively connected to several temperature sensing mechanisms.

[0006] Specifically, the temperature sensing mechanism includes a temperature sensor and a temperature display instrument. Temperature sensing mechanisms are installed on the pipeline between the regenerator and the pyrolysis furnace, the inlet and outlet of the regenerator, the pipeline between heater B and the regenerator, and the pipeline between heater B and the pyrolysis furnace.

[0007] Specifically, the pyrolysis furnace is a vertical fluidized bed structure.

[0008] Specifically, heater A is a cylindrical ceramic electric heater.

[0009] Specifically, the heater B is a shell-and-tube type electric heater structure.

[0010] Specifically, the regenerator is a shell-and-tube heat exchanger structure.

[0011] The beneficial effects of this invention are as follows: This invention provides a temperature control system for a high-temperature catalytic cracking furnace for methane. By recovering the waste heat from the cracking tail gas and intelligently adjusting the heating power of the heater by the control device, intelligent temperature control of the gas-solid two-phase flow inside the cracking furnace is achieved, thereby realizing efficient cracking of methane under the action of a catalyst and reducing the production cost of carbon nanotubes. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] In the diagram: 1. Cracking furnace, 2. Heater A, 3. Temperature sensor, 4. Heater B, 5. Regenerator, 6. Adjustment...

[0015] 7. Power supply, 8. Control device, 9. Temperature sensing mechanism. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] As attached Figure 1 As shown, a temperature control system for a high-temperature catalytic cracking furnace of methane includes a cracking furnace 1, a heater A2, a temperature sensor 3, a heater B4, a regenerator 5, a power regulator 6, and a control device 7. The heater A2 is encased in the outer wall of the cracking furnace 1. The temperature sensor 3 is located inside the cracking furnace 1 and monitors the temperature of the gas-solid two-phase flow inside the furnace 1. The tail gas outlet of the cracking furnace 1, the regenerator 5, and the inlet of the heater B4 are sequentially connected by pipelines. The power regulator 6 and the temperature sensor 3 are both communicatively connected to the control device 7. The heater B4 is communicatively connected to the power regulator 6. The control device 7 is communicatively connected to several temperature sensing mechanisms 8. The regenerator 5 recovers the waste heat of the cracked tail gas B, and the heater B4 heats the methane feed gas A after it has been reheated by the regenerator 5. The control device 7 controls and adjusts the power output of the power regulator 6 by detecting the temperature signals inside the cracking furnace 1, before and after the heater A2, before and after the heater B4, and before and after the regenerator 5.

[0019] The temperature sensing mechanism 8 includes a temperature sensor and a temperature display. Temperature sensing mechanisms 8 are installed on the pipeline between the regenerator 5 and the pyrolysis furnace 1, the inlet and outlet of the regenerator 5, the pipeline between the heater B4 and the regenerator 5, and the pipeline between the heater B4 and the pyrolysis furnace 1.

[0020] Cracking furnace 1 is a vertical fluidized bed structure, where catalyst particles are suspended and flow in a methane gas stream to form a gas-solid two-phase flow.

[0021] Heater A2 is a cylindrical ceramic electric heater.

[0022] Heater B4 is a shell-and-tube type electric heater.

[0023] Regenerator 5 is a shell-and-tube heat exchanger.

[0024] The power regulator 6 uses a thyristor to adjust the voltage to achieve continuous temperature control.

[0025] The control device 7 receives the temperature sensor 3, compares it with the set temperature, and calculates the adjustment command through an algorithm.

[0026] The working method of this application is as follows: Step 1: The catalyst particles and protective nitrogen gas inside the cracking furnace 1 are heated to 800°C by heater A2 and maintained at a constant temperature.

[0027] Step 2: The ambient temperature methane feed gas A is first preheated by the regenerator 5 to recover the residual heat of the cracking tail gas B. The preheated methane gas enters the heater B4 and is heated to a high temperature of 800±2℃ before entering the cracking furnace 1.

[0028] Step 3: The high-temperature methane gas flow at 800℃ suspends the catalyst particles inside the cracking furnace 1, forming a gas-solid two-phase flow state. The methane molecules undergo a cracking reaction the instant they come into contact with the surface of the catalyst particles, decomposing into carbon atoms and hydrogen molecules. The carbon atoms are deposited on the catalyst surface to produce columnar carbon nanotubes.

[0029] Step 4: The pyrolysis tail gas B containing methane and hydrogen at 750°C passes through the top filter layer of the pyrolysis furnace 1 and enters the regenerator 5 to exchange heat with the ambient temperature methane feed gas A. The methane feed gas A is heated to 700-730°C, and the pyrolysis tail gas B is cooled to 40°C before being discharged into the subsequent process unit.

[0030] Step 5: The control device 7 monitors the temperature signal inside the cracking furnace 1, analyzes and calculates the temperature signal, and sends the control command to the power regulator 6. The power regulator 6 adjusts the output power of the heater A2, thereby intelligently controlling the temperature inside the cracking furnace to be maintained at 800±2℃, and columnar carbon nanotubes are continuously and stably generated on the surface of the catalyst inside the cracking furnace 1.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A temperature control system for a high-temperature catalytic cracking furnace for methane, characterized in that, The device includes a pyrolysis furnace (1), heater A (2), temperature sensor (3), heater B (4), regenerator (5), power regulator (6), and control device (7). The heater A (2) is wrapped around the outer wall of the pyrolysis furnace (1). The temperature sensor (3) is located inside the pyrolysis furnace (1). The tail gas outlet of the pyrolysis furnace (1), the regenerator (5), the heater B (4), and the inlet of the pyrolysis furnace (1) are connected together in sequence through pipelines. The power regulator (6) and the temperature sensor (3) are both connected to the control device (7). The heater B (4) is connected to the power regulator (6). The control device (7) is connected to several temperature sensing mechanisms (8).

2. The temperature control system for the high-temperature catalytic cracking furnace of methane according to claim 1, characterized in that: The temperature sensing mechanism (8) includes a temperature sensor and a temperature display. Temperature sensing mechanisms (8) are installed on the pipeline between the regenerator (5) and the pyrolysis furnace (1), the inlet and outlet of the regenerator (5), the pipeline between the heater B (4) and the regenerator (5), and the pipeline between the heater B (4) and the pyrolysis furnace (1).

3. The temperature control system for the high-temperature catalytic cracking furnace of methane according to claim 1, characterized in that: The pyrolysis furnace (1) is a vertical fluidized bed structure.

4. The temperature control system for the high-temperature catalytic cracking furnace of methane according to claim 1, characterized in that: The heater A(2) is a cylindrical ceramic electric heater.

5. The temperature control system for the high-temperature catalytic cracking furnace of methane according to claim 1, characterized in that: The heater B(4) is a shell-type electric heater structure.

6. The temperature control system for the high-temperature catalytic cracking furnace of methane according to claim 1, characterized in that: The regenerator (5) is a shell-and-tube heat exchanger.

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