A device and method for rapidly heating large-flow flue gas with steam-assisted microwave screw

Abstract

The present invention discloses a device and method for rapidly heating large-flow flue gas with a steam-assisted microwave screw, which relates to the field of flue gas heating technology. The device includes a heating body and an intelligent control system. The heating body includes a heating furnace body and a microwave source system, a constant-pressure spray system, and an exhaust screw system connected to the intelligent control system; a heating channel is provided inside the heating furnace body, and the contact surface between the heating channel and the heating furnace body is wrapped with a refractory material layer; the inlet end of the heating channel is connected to an external gas, and the outlet end of the heating channel is connected to the required working environment; the inlet and outlet of the heating channel are both equipped with a microwave leakage prevention device and a temperature and humidity measuring device, a dryer, and a flow monitor connected to the intelligent control system. The present invention has the advantages of large flow, rapid heating, and intelligent temperature control, and is suitable for rapid heating of flue gas before injection into the reservoir in unconventional natural gas development and storage projects such as industrial source heat flue gas enhanced coalbed methane.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas heating, and in particular to a device and method for rapidly heating large-flow flue gas by using a steam-assisted microwave screw. Background Art

[0002] CO2-ECBM (CO2-ECBM) is considered a potential means of efficient coalbed methane development. CO2 injected into coal seams can displace large quantities of coalbed methane due to its competitive adsorption advantage, thereby enhancing coalbed methane extraction and simultaneously achieving CO2 storage. However, the current relatively high cost of CO2 capture, which can account for up to 60% of the total cost of the entire production chain, has limited the widespread application of CO2-ECBM technology. Therefore, scholars at home and abroad have proposed bypassing the CO2 capture and separation stage and directly using industrial flue gas for enhanced coalbed methane development and storage, a technique known as flue-gas ECBM (Flue-gas ECBM). In on-site flue-gas ECBM projects, large volumes of flue gas from power plants and chemical plants are rapidly heated to a certain temperature before being injected into the reservoir. This thermal effect, synergistic with the CO2 displacement effect, induces methane desorption within the reservoir. Simultaneously, the thermal effect modifies the reservoir structure, enhancing methane migration and flow, ultimately achieving efficient coalbed methane displacement and development. Therefore, achieving efficient and rapid heating of large volumes of flue gas is a key issue in engineering applications.

[0003] Currently, steam and electric heating are the main gas heating methods used in industry. However, steam heating has low energy efficiency and slow heating speed, which cannot meet the requirements of CO2-ECBM technology for rapid and high-flow gas heating. Electric heating has limitations, is prone to explosion, and has poor safety. Microwave heating is an economical, green, efficient, and safe heating method. However, in the field of heating, existing microwave gas heating technology has a low heating limit, a small heating flow rate, and a slow heating speed.

[0004] Therefore, in view of the above problems, it is necessary to propose a safe and efficient flue gas heating method to achieve rapid heating before large-flow flue gas injection in industrial source flue gas flooding and coalbed methane storage projects. Summary of the Invention

[0005] In view of this, the present invention discloses a device and method for quickly heating large-flow flue gas with a steam-assisted microwave screw. Through an effective combination of water vapor heating, gas-solid heat exchange, and process heating, rapid heating of large-flow flue gas before injection in industrial source flue gas drive coalbed methane storage projects is achieved, thereby providing key technical support for the promotion and application of flue gas drive coalbed methane storage technology.

[0006] According to the purpose of the present invention, a steam-assisted microwave screw device for rapidly heating large-flow flue gas is proposed, comprising a heating body and an intelligent control system. The heating body comprises a heating furnace body and a microwave source system, a constant-pressure spray system, and an exhaust screw system connected to the intelligent control system. A heating channel is provided inside the heating furnace body, and the contact surface between the heating channel and the heating furnace body is wrapped with a refractory material layer. The inlet end of the heating channel is connected to an external gas source, and the outlet end of the heating channel is connected to a desired operating environment. The inlet and outlet of the heating channel are both equipped with a microwave leakage prevention device, a temperature and humidity measuring device connected to the intelligent control system, and a flow monitor. The outlet of the heating channel is also provided with a dryer.

[0007] The microwave source system includes a microwave generator, which is arranged on the heating furnace body and is provided with an airtight device at the connection with the heating furnace body;

[0008] The constant-pressure spray system includes a steam generator and a constant-pressure nozzle airtightly connected to the steam generator; the steam generator is arranged in the heating furnace body outside the inlet end of the heating channel, and the nozzle of the constant-pressure nozzle is arranged through the refractory layer toward the axis of the heating channel; the steam generator is externally connected to a high-pressure water source;

[0009] The exhaust screw system includes a motor and an exhaust screw. The motor is connected to the exhaust screw and can drive the exhaust screw to rotate. The exhaust screw is arranged in the heating channel and has a truncated cone structure. Its diameter gradually decreases from the entrance to the heating channel to the exit of the heating channel, and the thread pitch becomes denser from the bottom circle to the top circle.

[0010] Preferably, the heating furnace body is made of non-magnetic material and is cylindrical as a whole; the heating channel is in the shape of a truncated cone with a diameter gradually decreasing from the heating channel entrance to the heating channel exit; the refractory material layer is made of corundum or corundum mullite or magnesium oxide-titanium oxide.

[0011] Preferably, the microwave generators are installed in multiple rows or in a ring shape on the front and rear walls of the heating furnace body, and the frequency of the microwave generators is 300MHz-300GHz.

[0012] Preferably, the constant pressure spray system is closer to the heating channel outlet than the microwave leakage prevention device, temperature and humidity measuring device and flow monitor arranged at the heating channel entrance; the microwave leakage prevention device is wrapped and protected by refractory material and is closer to the constant pressure spray system than the temperature and humidity measuring device, dryer and flow monitor at the corresponding heating channel entrance or heating channel exit.

[0013] Preferably, the steam generating device is divided into multiple sections and is arranged in a ring shape along the circumference of the heating channel inside the heating furnace body; the constant pressure nozzles are multiple and are arranged in a ring shape on the steam generating device.

[0014] Preferably, the motor is a hexahedron, the five sides close to the heating channel are wrapped with thermal insulation materials, and the remaining side is open.

[0015] Preferably, the vacuum screw is made of a material with high microwave absorption rate.

[0016] Preferably, the temperature and humidity measuring device is a contact temperature and humidity measuring device, which is used to feed back the gas temperature and humidity at the outlet and inlet of the heating channel to the intelligent control system; the temperature and humidity measuring device at the outlet of the heating channel is installed downstream of the dryer.

[0017] The present invention further discloses a method for heating flue gas using the above-mentioned device for rapidly heating large-flow flue gas with the steam-assisted microwave screw, comprising the following steps:

[0018] Step 1: Based on the target gas parameters, the intelligent control system performs rough preheating on the heating equipment: the frequency and number of microwave generators are set to preheat the water in the steam generator and the vacuum screw with high microwave absorption rate in the vacuum screw system;

[0019] Step 2: When the water in the steam generator is heated to a certain temperature, the constant pressure nozzle opens to spray out 200-300 degrees Celsius steam, and the screw is preheated to 1000-1200 degrees Celsius to become a high-temperature heat source. The intelligent control system adjusts the motor power to drive the exhaust screw to pump gas into and out of the preheated heating channel. The gas undergoes a three-stage heating process of water vapor heating, gas-solid heat exchange, and process heating, and the final output target gas temperature reaches 800 degrees Celsius.

[0020] Step 3: The gas parameters after the three-stage heating are monitored in real time by the temperature and humidity measuring devices and flow monitors installed at the outlet of the heating channel, and timely feedback is given to the intelligent control system. When the parameters do not meet the standards, the intelligent control system adjusts the motor power, the frequency of the microwave generator, and the constant pressure of the constant pressure nozzle system to change the heating conditions.

[0021] Preferably, in the three-stage heating program, the temperature of the exogenous gas entering the heating channel after being heated by water vapor is 200-300 degrees Celsius. The gas heated by water vapor exchanges gas-solid heat in the process of passing through the high-temperature vacuum screw, and the temperature is 700-800 degrees Celsius. While the gas-solid heat exchange is taking place, the gas is quickly extracted and compressed by the vacuum screw, and the gas is heated again by 50-60 degrees Celsius through the working method, and the final output target gas temperature reaches 800 degrees Celsius.

[0022] Compared with the prior art, the advantages of the device and method for rapidly heating large-flow flue gas with a steam-assisted microwave screw disclosed in the present invention are:

[0023] (1) The present invention uses microwaves as the heating source and utilizes its high efficiency and energy-saving characteristics to reduce the heating operation cost to 60% to 70% of the original cost, which is very significant in industrial fields with high heating demand.

[0024] (2) The present invention can greatly improve the heating efficiency through the three-stage heating method of water vapor heating, gas-solid heat exchange, and process heating, and can produce a large flow of high-temperature gas in a short time. It can realize the rapid heating of large flow of flue gas before injection in the industrial source flue gas drive coalbed methane storage project, and solves the problem of rapid heating of large flow of flue gas in the hot flue gas drive coalbed methane storage project. It has broad application prospects and also provides key technical support for the promotion and application of flue gas drive coalbed methane storage technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 Schematic diagram of the exhaust screw structure.

[0028] Figure 3 It is a schematic flow chart of the three-stage heating method of the present invention.

[0029] Figure 4 This is a device layout diagram for an implementation case of the present invention.

[0030] In the figure: 1-intelligent control system; 2-microwave source system; 3-constant pressure spray system; 4-exhaust screw; 5-motor; 6-refractory material layer; 7-heating furnace body; 8-heating channel; 9-heating channel entrance; 10-heating channel exit; 11-microwave leakage prevention device; 12-temperature and humidity measuring device; 13-dryer; 14-flow monitor; 15-heating body; 16-external gas interface; 17-gas transfer pipe; 18-air inlet wellhead; 19-high-pressure water source; 20-deep coal seam; 21-air outlet wellhead. DETAILED DESCRIPTION

[0031] The following is a brief description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are also within the scope of protection of the present invention.

[0032] Figures 1-4 The preferred embodiments of the present invention are shown and analyzed in detail.

[0033] The present invention discloses a device for rapidly heating large-flow flue gas with steam-assisted microwave screw. Figure 1 As shown, it includes a heating body 15 and an intelligent control system 1.

[0034] The heating body 15 includes a heating furnace body 7 and a microwave source system 2 , a constant pressure spray system 3 , and an exhaust screw system connected to the intelligent control system 1 .

[0035] A heating channel 8 is provided inside the heating furnace body 7, and the contact surface between the heating channel 8 and the heating furnace body 7 is wrapped with a refractory material layer 6. The heating furnace body 7 is made of non-magnetic material and is cylindrical as a whole but not limited to a cylindrical shape. The heating channel 8 is in the shape of a truncated cone with a diameter gradually decreasing from the heating channel inlet 9 to the heating channel outlet 10. The refractory material layer 6 is magnesium oxide-titanium oxide with the characteristics of high temperature resistance, oxidation resistance and corrosion resistance. The heating channel inlet 9 is connected to the external gas, and the heating channel outlet 10 is connected to the required working environment. The external gas enters the heating channel 8 from the heating channel inlet 9 and undergoes three processes of steam heating, gas-solid heat exchange and working heating inside it. It can eventually be heated to nearly one thousand degrees Celsius and output from the heating channel outlet 10. The entrance and exit of the heating channel 8 are both equipped with a microwave leakage prevention device 11, a temperature and humidity measuring device 12 connected to the intelligent control system 1, and a flow monitor 14. The heating channel outlet 10 is also provided with a dryer 13. The constant pressure spray system 3 is closer to the heating channel outlet 10 than the microwave leakage prevention device 11, the temperature and humidity measuring device 12 and the flow monitor 14 provided at the heating channel inlet 9. The microwave leakage prevention device 11 is wrapped and protected by refractory materials and is installed on a side of the constant pressure spray system 3 that is closer to the temperature and humidity measuring device 12, the dryer 13 and the flow monitor 14 at the corresponding heating channel inlet 9 or heating channel outlet 10. The temperature and humidity measuring device 12 at the heating channel outlet 10 is installed downstream of the dryer 13. The temperature and humidity measuring device 12 is a contact temperature and humidity measuring device 12 with specific electronic components embedded in it, which is used to feed back the gas temperature and humidity at the heating channel outlet 10 and the heating channel inlet 9 to the intelligent control system 1. The flow monitor 14 is made of a high temperature resistant, corrosion resistant and oxidation resistant material, with specific electronic components embedded in the bottom, which can automatically process data and feed back the results to the intelligent control system 1. The microwave leakage prevention device 11, the temperature and humidity measuring device 12, the dryer 13 and the flow monitor 14 are all common products on the market, and their models are not described in detail here.

[0036] The microwave source system 2 consists of microwave generators and transmission waveguides. The microwave generators are installed in multiple rows in a ring shape on the front and rear walls of the heating furnace 7, with sealing rings installed at the connection points. The microwave generators have a frequency of 300 MHz to 300 GHz. The microwave source system 2 is used to preheat the water in the steam generator and the exhaust screw 4 in the exhaust screw system.

[0037] The constant pressure spray system 3 includes a steam generating device and a constant pressure nozzle that is airtightly connected to the steam generating device. The steam generating device is divided into multiple sections and is arranged in a ring shape along the circumference of the heating channel 8 in the heating furnace body 7 outside the inlet 9 of the heating channel. It is connected to an external high-pressure water source 19. The water injection amount and the closed state are controllable. It is made of high temperature and high pressure resistant materials. There are multiple constant pressure nozzles, which are arranged in a ring on the steam generating device, and their nozzles are set through the refractory material layer 6 toward the axis of the heating channel 8. After the intelligent control system 1 controls the water injection of the steam generating device, it can be heated in a closed manner by microwaves. When the liquid inside it is heated to a certain pressure, the constant pressure nozzle can be pushed open and water vapor of a predetermined temperature can be sprayed toward the axis of the heating channel 8 to preliminarily heat the gas.

[0038] The exhaust screw system includes a motor 5 and an exhaust screw 4. The motor 5 is connected to the exhaust screw 4 and can drive the exhaust screw 4 to spiral. Figure 2 As shown, the extraction screw 4 is located within the heating channel 8 and has a frustoconical structure. Its diameter gradually decreases from the heating channel inlet 9 to the heating channel outlet 10, and the pitch of the threads becomes increasingly dense from the base to the top. This unique structure causes the heating channel 8's gas-holding capacity to decrease from the heating channel inlet 9 to the heating channel outlet 10. During the rapid rotation of the extraction screw 4, the heating channel 8 creates a negative pressure at the heating channel outlet 10, enabling continuous extraction and compression of the gas. The extraction screw 4 is made of a high-microwave-absorbency material that is resistant to high temperatures, oxidation, and corrosion, and does not react with water at high temperatures. Such materials include a new type of composite ceramic material with high microwave absorptivity or ceramic-coated silicon carbide. The motor 5 is a hexahedron. The five sides adjacent to the heating channel 8 are wrapped with insulation material to isolate the channel from the high temperatures. The remaining side is open for heat dissipation. In specific applications, if the heating temperature is too high, the motor 5 can be installed independently of the heating furnace 7 to enhance its heat dissipation performance. It can even be combined with liquid cooling technology to expand the device's applicability. The vacuum screw 4 is selected. On the one hand, the vacuum screw 4 can be heated to a higher temperature by microwaves in a very short time, and can perform secondary heating of the gas by heat conduction; on the other hand, the vacuum screw 4 is cone-shaped, and combined with the heating channel 8 with a gradually smaller diameter, it will have a tertiary heating effect of compression heating on the gas during the rotation process.

[0039] Intelligent control system 1 is connected to microwave source system 2, constant-pressure spray system 3, exhaust screw system, and temperature and humidity measuring devices 12, dryer 13, and flow rate monitor 14 installed at the inlet and outlet of heating channel 8 via wires wrapped in thermal insulation material. Intelligent control system 1 can collect real-time data on the temperature, humidity, and flow rate of the gas at the inlet and outlet of heating channel 8 by monitoring temperature and humidity measuring devices 12 and flow rate monitor 14 in real time. Based on pre-entered target gas parameters, intelligent control system 1 adjusts the microwave frequency of microwave source system 2, the power of motor 5 of exhaust screw system, and the nozzle pressure of constant-pressure spray system 3 to achieve the target temperature, humidity, and flow rate of gas.

[0040] The present invention further discloses a method for heating flue gas using the above-mentioned device for rapidly heating large-flow flue gas with the steam-assisted microwave screw, comprising the following steps:

[0041] Step 1: Based on the target gas parameters, the intelligent control system 1 performs rough preheating on the heating equipment: the frequency and number of microwave generators are set to preheat the water in the steam generating device and the vacuum screw 4 with high microwave absorption rate in the vacuum screw system.

[0042] Step 2: When the water in the steam generator is heated to a certain temperature, the constant pressure nozzle is opened to spray out 200-300 degrees Celsius steam, and the screw is preheated to 1000-1200 degrees Celsius to become a high-temperature heat source. The intelligent control system 1 adjusts the power of the motor 5 to drive the vacuum screw 4 to extract and pressurize the gas into and out of the preheated heating channel 8, and the gas is subjected to a three-stage heating process of water vapor heating, gas-solid heat exchange and work heating, and the final output target gas temperature reaches 800 degrees Celsius. The three-stage heating process is as follows Figure 3 As shown, the exogenous gas enters the heating channel 8 and is heated by water vapor to a temperature of 200-300 degrees Celsius. The gas heated by water vapor undergoes gas-solid heat exchange as it passes through the high-temperature extraction screw 4, reaching a temperature of 700-800 degrees Celsius. Simultaneously, the gas is rapidly extracted and compressed by the extraction screw 4, raising the gas temperature by another 50-60 degrees Celsius through the process, ultimately achieving a target gas temperature of 800 degrees Celsius. If the application scenario has certain requirements for gas humidity, the intelligent control system 1 can also control the dryer 13 to start drying the gas, ultimately outputting the desired target gas from the heating channel outlet 10.

[0043] Step 3: The gas parameters after the three-stage heating are monitored in real time by the temperature and humidity measuring device 12 and the flow monitor 14 set at the outlet of the heating channel 10, and timely feedback is given to the intelligent control system 1. When the parameters do not meet the standards, the intelligent control system 1 adjusts the power of the motor 5, the frequency of the microwave generator, and the constant pressure of the constant pressure nozzle system to change the heating conditions, so as to obtain the target gas with the required temperature and flow more accurately.

[0044] The invention discloses a device and method for rapidly heating large-flow flue gas with a steam-assisted microwave screw. The device and method can be applied to the CO2 flooding coalbed methane storage (CO2-ECBM) technology for efficient development of coalbed methane. Figure 4 Arrange facilities.

[0045] The intelligent control system 1 is semi-independent and the connection distance between it and the heating body 15 is lengthened to enable remote control, which can keep the operator away from the high temperature and high pressure environment and ensure the safety of operation.

[0046] The heating body 15 is placed on the surface above the well, and an airtight external gas interface 16 made of high-temperature resistant material and an airtight gas transfer pipe 17 made of rigid, high-temperature resistant material are respectively installed at the heating channel inlet 9 and the heating channel outlet 10. These two pipes are used to introduce coal-fired fuel gas and direct the heated and pressurized gas into the gas inlet wellhead 18. In particular, when the gas transfer pipe 17 is inserted into the gas inlet wellhead 18, the connection must be airtight, which provides favorable conditions for the pressurized introduction of coal-fired flue gas from the power plant.

[0047] 20 3kW microwave generators are used, divided into 2 groups, 10 in each group, and 5 in each row, which are installed in a ring shape on the front and rear walls of the furnace body to make the heat generation uniform and meet the demand for higher heating power. A large capacity high-pressure water source 19 is set outside the wellhead, such as a 200m high-pressure water source 3m outside the heating body 15. 3 A large water reservoir is used to meet the water needs of the constant-pressure spray system 3. After dust removal and denitrification, the power plant flue gas can be connected to the heating body 15 on the well through the airtight external gas interface 16. After being heated and pressurized, it can enter the air inlet wellhead 18 through the gas transfer tube 17 and flow through the deep coal seam 20 to displace the coalbed methane. The displaced coalbed methane will eventually flow out of the gas outlet wellhead 21 and be collected.

[0048] This device, with the help of a combination of multiple heating methods and a microwave heat source with high efficiency, can perform high-temperature and high-pressure treatment of coalbed methane in a short period of time. It can provide a large flow of high-temperature and high-pressure coalbed methane for CO2-ECBM technology, and can effectively reduce the heating cost of coalbed methane in this technology by 30 to 40%, providing the possibility for the effective promotion of this technology. It is safer, more stable, economical and greener than conventional heating methods.

[0049] In addition, the present invention is not limited to the rapid heating of large-flow industrial flue gas, but is also applicable to gas heating in laboratories, indoors and other scenarios.

[0050] The above description of the disclosed embodiments will enable one skilled in the art to implement and use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A steam-assisted microwave screw device for rapidly heating large-flow flue gas, characterized in that: The invention comprises a heating body (15) and an intelligent control system (1), wherein the heating body (15) comprises a heating furnace body (7) and a microwave source system (2), a constant pressure spray system (3), and an exhaust screw system connected to the intelligent control system (1); a heating channel (8) is provided inside the heating furnace body (7), and a refractory material layer (6) is wrapped on the contact surface between the heating channel (8) and the heating furnace body (7); an inlet (9) of the heating channel is connected to an external gas source, and an outlet (10) of the heating channel is connected to a desired working environment; both the inlet and outlet of the heating channel (8) are equipped with a microwave leakage prevention device (11), a temperature and humidity measuring device (12), and a flow monitor (14) connected to the intelligent control system (1); and a dryer (13) is further provided at the outlet (10); The microwave source system (2) includes a microwave generator, which is arranged on a heating furnace body (7) and has an airtight device at its connection with the heating furnace body (7); The constant-pressure spray system (3) comprises a steam generating device and a constant-pressure nozzle airtightly connected to the steam generating device; the steam generating device is arranged in a heating furnace body (7) outside the inlet (9) end of the heating channel, and the nozzle of the constant-pressure nozzle passes through the refractory material layer (6) and is arranged toward the axis of the heating channel (8); the steam generating device is externally connected to a high-pressure water source (19); The exhaust screw system comprises a motor (5) and an exhaust screw (4), wherein the motor (5) is connected to the exhaust screw (4) and can drive the exhaust screw (4) to rotate. The exhaust screw (4) is arranged in the heating channel (8) and has a truncated cone-shaped structure. Its diameter gradually decreases from the heating channel inlet (9) to the heating channel outlet (10), and the thread pitch becomes increasingly dense from the bottom circle to the top circle.

2. The device for rapidly heating large-flow flue gas with steam-assisted microwave screw according to claim 1, characterized in that: The heating furnace body (7) is made of non-magnetic material and is cylindrical in shape as a whole; the heating channel (8) is in the shape of a truncated cone with a diameter gradually decreasing from the heating channel inlet (9) to the heating channel outlet (10); and the refractory material layer (6) is made of corundum, corundum mullite, or magnesium oxide-titanium oxide.

3. The device for rapidly heating large-flow flue gas with steam-assisted microwave screw according to claim 1, characterized in that: The microwave generators are installed in multiple rows or in a ring shape on the front and rear walls of the heating furnace body (7), and the frequency of the microwave generators is 300MHz-300GHz.

4. The device for rapidly heating large-flow flue gas with steam-assisted microwave screw according to claim 1, characterized in that: The constant-pressure spray system (3) is closer to the heating channel outlet (10) than the microwave leakage prevention device (11), the temperature and humidity measuring device (12), and the flow monitor (14) provided at the heating channel inlet (9); the microwave leakage prevention device (11) is wrapped and protected by a refractory material and is closer to the constant-pressure spray system (3) than the temperature and humidity measuring device (12), the dryer (13), and the flow monitor (14) at the corresponding heating channel inlet (9) or heating channel outlet (10).

5. The device for rapidly heating large-flow flue gas with steam-assisted microwave screw according to claim 1, characterized in that: The steam generating device is divided into multiple sections and is arranged in a ring shape along the circumference of the heating channel (8) in the heating furnace body (7); the constant pressure nozzles are multiple and arranged in a ring shape on the steam generating device.

6. The device for rapidly heating large-volume flue gas with steam-assisted microwave screw according to claim 1, characterized in that: The motor (5) is a hexahedron, and the five sides close to the heating channel (8) are all wrapped with thermal insulation materials, and the remaining side is open.

7. The device for rapidly heating large-flow flue gas with steam-assisted microwave screw according to claim 1, characterized in that: The vacuum screw (4) is made of a material with high microwave absorption rate.

8. The device for rapidly heating large-flow flue gas with steam-assisted microwave screw according to claim 1, characterized in that: The temperature and humidity measuring device (12) is a contact-type temperature and humidity measuring device (12) used to feed back the temperature and humidity of the gas at the heating channel outlet (10) and the heating channel inlet (9) to the intelligent control system (1); the temperature and humidity measuring device (12) at the heating channel outlet (10) is installed downstream of the dryer (13).

9. A method for heating flue gas using the device for rapidly heating large-flow flue gas with a steam-assisted microwave screw according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Based on the target gas parameters, the intelligent control system (1) performs rough preheating on the heating equipment: the frequency and number of microwave generators are set to preheat the water in the steam generating device and the vacuum screw (4) with high microwave absorption rate in the vacuum screw system; Step 2: When the water in the steam generating device is heated to a certain temperature, the constant pressure nozzle is opened to spray out 200-300 degrees Celsius steam, and the screw is preheated to 1000-1200 degrees Celsius to become a high-temperature heat source. The intelligent control system (1) adjusts the power of the motor (5) to drive the exhaust screw (4) to extract and pressurize the gas into and out of the preheated heating channel (8), and the gas is subjected to a three-stage heating process of water vapor heating, gas-solid heat exchange and process heating, and the final output target gas temperature reaches 800 degrees Celsius; Step 3: The gas parameters after the three-stage heating are monitored in real time by a temperature and humidity measuring device (12) and a flow monitor (14) provided at the outlet of the heating channel (10), and the gas parameters are fed back to the intelligent control system (1) in a timely manner. When the parameters do not meet the standards, the intelligent control system (1) adjusts the power of the motor (5), the frequency of the microwave generator, and the constant pressure of the constant pressure nozzle system to change the heating conditions.

10. The method according to claim 9, characterized in that In the three-stage heating process, the exogenous gas enters the heating channel (8) and is heated by water vapor to a temperature of 200-300 degrees Celsius. The gas heated by water vapor undergoes gas-solid heat exchange in the process of passing through the high-temperature exhaust screw (4), and the temperature is 700-800 degrees Celsius. While the gas-solid heat exchange is taking place, the gas is rapidly extracted and compressed by the exhaust screw (4), and the gas temperature is raised again by 50-60 degrees Celsius through the working method, and the final output target gas temperature reaches 800 degrees Celsius.

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