High-temperature anti-deposition preheating device for corrosive gas

Abstract

The application discloses a high-temperature anti-deposition preheating device for corrosive gas, which comprises an execution module, a vertical spiral pipe, a gas flow regulating valve and a temperature sensor, wherein the corrosive gas passes through the spiral pipe from top to bottom, the spiral pipe is coated with an electric heating layer outside, the heating temperature of the electric heating layer on the spiral pipe is higher than the gas temperature in the pipe, so that a temperature gradient is formed between the spiral pipe and the heated gas; the gas flow regulating valve is arranged at the gas inlet of the spiral pipe and is used for controlling the flow rate and flow of the input gas; the temperature sensor is arranged at the gas outlet of the spiral pipe and is used for sensing the temperature of the output gas of the spiral pipe; and the execution module is electrically connected with the electric heating layer, the gas flow regulating valve and the temperature sensor, and controls the working of the electric heating layer and the gas flow regulating valve according to the sensed temperature of the temperature sensor. The device has the advantages of simple structure, effective prevention of gas particle deposition in the spiral pipe, uniform heating, high efficiency, good precision and high-temperature preheating for corrosive gas.

Description

Technical Field

[0001] This invention belongs to the field of gas heating technology, and particularly relates to a high-temperature anti-precipitation preheating device for corrosive gases. Background Technology

[0002] More and more aero-engines and gas turbines are operating in marine environments. Compared to land-based aircraft, the environmental conditions for the hot-end components of marine gas turbines and carrier-based aircraft engines are exceptionally harsh during service. In addition to the high temperature and pressure experienced by the hot-end components, they also suffer from the corrosive effects of high salt spray and high humidity in the marine environment. The turbine rotor is the component in aero-engines and marine gas turbines operating in the most severe environment. It not only has to withstand enormous low-cycle alternating loads under high-temperature conditions, but the high-temperature exhaust gases from the engine and the salt spray corrosion from the marine atmosphere also exacerbate its damage. Therefore, the turbine rotor is one of the most frequently failing components. In industrial production processes, gases often need to be heated, especially some gases (or corrosive gases) where temperature control is critical. Uniform heating and good heat exchange are essential, thus placing high demands on the structure of the entire gas electric heater.

[0003] Existing gas heating devices still have defects such as uneven gas heating and poor heat exchange effect, which cause some gases or corrosive gases to overheat locally in the electric heater, causing unnecessary decomposition or chemical reactions and affecting normal use. Summary of the Invention

[0004] To overcome the shortcomings and deficiencies of the prior art, the purpose of this invention is to provide a high-temperature anti-precipitation preheating device for corrosive gases.

[0005] This invention is implemented as follows: a high-temperature anti-precipitation preheating device for corrosive gases. The device includes an execution module and a vertically positioned spiral tube. The corrosive gas passes through the spiral tube from top to bottom. The spiral tube is covered with an electric heating layer, which heats the spiral tube to a temperature higher than the gas temperature inside the tube, creating a temperature gradient between the spiral tube and the heated gas. An airflow regulating valve is installed at the inlet of the spiral tube to control the flow rate and velocity of the input gas. A temperature sensor is installed at the outlet of the spiral tube to sense the temperature of the output gas. The execution module is electrically connected to the electric heating layer, the airflow regulating valve, and the temperature sensor. The execution module controls the operation of the electric heating layer and the airflow regulating valve based on the temperature sensed by the temperature sensor.

[0006] Preferably, the spiral tube is provided with a plurality of evenly distributed anti-particle deposition components. Each anti-particle deposition component includes a guide column, and the guide column is provided with a plurality of guide blades symmetrically distributed around the axis of the guide column. A guide groove is formed between adjacent guide blades, and the guide column is divided into adjacent parallel sections and spiral sections. The guide grooves of the parallel sections are parallel to the axis of the guide column. In the direction away from the parallel sections, each guide groove of the spiral section is twisted around the axis.

[0007] Preferably, the anti-particle deposition component further includes a washer coaxial with the flow guide column; wherein, one end of the parallel section is fixed on the washer, and the flow guide groove of the parallel section is in communication with the hollow part of the washer.

[0008] Preferably, the device further includes a reflux pipe, on which a reflux regulating valve is provided, and both ends of the reflux pipe are respectively connected to the air inlet at the top end and the air outlet at the bottom end of the spiral tube; wherein, the execution module is electrically connected to the reflux regulating valve, and the execution module controls the operation of the reflux regulating valve according to the temperature sensed by the temperature sensor.

[0009] Preferably, the inner wall of the spiral tube, the inner wall of the return tube, the surface of the anti-particle deposition component, the surface of the component with the return regulating valve located inside the return tube, and the surface of the component with the airflow regulating valve located inside the spiral tube are all coated with an anti-corrosion coating.

[0010] Preferably, the corrosive gas is a sulfur dioxide gas containing fine particles.

[0011] This invention overcomes the shortcomings of existing technologies and provides a high-temperature preheating device for preventing sedimentation of corrosive gases. The device heats the corrosive gas passing through the spiral pipe using a heating layer wrapped around its outer side. This heating layer creates a temperature gradient between the pipe and the heated gas, utilizing thermophoresis to move particles adhering to the inner wall of the pipe towards the center, effectively preventing particle deposition and improving heating efficiency. Furthermore, the spiral pipe is vertically positioned, with the corrosive gas flowing downwards. This airflow direction and the downward-sloping structure of the spiral pipe effectively prevent particle deposition. During the heating process of the corrosive gas, the outlet of the spiral pipe... The gas output temperature is measured in real time by a temperature sensor at the outlet of the spiral tube. The measured temperature is compared with the set temperature, and the comparison signal is fed back to the execution module. The execution module controls the operation of the reflux regulating valve, airflow regulating valve, electric heater, heating layer, etc., based on the temperature sensed by the temperature sensor to achieve the ideal effect. Specifically, the execution module controls the reflux regulating valve on the reflux pipe. If the outlet gas temperature does not reach the required temperature, the outlet gas can be re-sent to the inlet of the spiral tube for secondary heating through the reflux pipe. Controlling the airflow regulating valve controls the airflow velocity and flow rate at the spiral tube inlet. In addition, to further prevent particle deposition, several anti-particle deposition components are evenly distributed inside the spiral tube of this invention. The anti-particle deposition components can transform the inflowing parallel airflow into a spiral airflow. Using turbulence, the deposited particles are rolled up and continue to flow with the airflow, which can effectively prevent particle deposition and make the airflow distribution uniform, thereby improving heating efficiency. The rotation angle of the spiral section of the guide vanes of the anti-particle deposition components is adjustable. By adjusting the rotation angle of the spiral vanes, the airflow velocity, rotation angle, and turbulence level can be controlled. In addition, to improve the stability and service life of the device, all components of the device that come into direct contact with corrosive gases are coated with an anti-corrosion coating.

[0012] Compared with the shortcomings and deficiencies of existing technologies, the present invention has the following beneficial effects:

[0013] (1) Compared with the existing technology, which has a complex structure and poor effect in preventing gas particle deposition, the present invention can effectively avoid the deposition of corrosive gas particles at high temperatures through the design of a vertical spiral tube, anti-particle deposition components and heating layer, and the structure is simpler.

[0014] (2) Compared to existing technologies that can only achieve single-point heating and cannot effectively control the heating temperature, resulting in low accuracy of the heated gas temperature, this invention uses a temperature sensor at the outlet of the spiral tube to measure the outlet temperature of the heated gas in real time. The measured temperature is compared with the set temperature, and the comparison signal is fed back to the execution module. The execution module controls the operation of the reflux regulating valve, airflow regulating valve, electric heater, heating layer, etc., based on the temperature sensed by the temperature sensor to achieve the ideal effect. Specifically, the execution module controls the reflux regulating valve on the reflux pipe. If the outlet airflow temperature does not reach the required temperature, the outlet airflow can be re-sent to the inlet of the spiral tube for secondary heating through the reflux pipe. Controlling the airflow regulating valve controls the airflow velocity and flow rate at the inlet of the spiral tube. This invention, through feedback control, can effectively control the heating gas temperature, improve heating accuracy and efficiency, and enable the gas to reach the set temperature more efficiently and accurately.

[0015] (3) Compared with the existing technology, which cannot effectively address the corrosive effects of corrosive gases, the present invention can effectively improve the stability and service life of the device by applying an anti-corrosion coating to the surface of the components that come into contact with corrosive gases. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the spiral tube (where the anti-particle deposition component is located) in the device of the present invention;

[0018] Figure 3 This is a schematic diagram of the anti-particle deposition component in the device of the present invention;

[0019] Figure 4 This is a diagram showing the electrical connections between the execution module and the temperature sensor, electric heating layer, airflow regulating valve, and reflux regulating valve in the device of this invention.

[0020] In the diagram, 1. Spiral tube, 2. Electric heating layer, 3. Airflow regulating valve, 4. Temperature sensor, 5. Actuation module, 6. Anti-particle deposition component, 6-1. Guide column, 6-2. Guide vane, 6-3. Washer, L1. Parallel section, L2. Spiral section, 7. Return pipe, 8. Return regulating valve, 9. Air inlet, 10. Air outlet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] like Figures 1-4 As shown, where, Figure 1 This is a schematic diagram of the structure of the device of the present invention; Figure 2 This is a schematic diagram of the internal cross-sectional structure of the spiral tube (where the anti-particle deposition component is located) in the device of the present invention; Figure 3 This is a schematic diagram of the anti-particle deposition component in the device of the present invention; Figure 4 This is a diagram showing the electrical connections between the execution module and the temperature sensor, electric heating layer, airflow regulating valve, and reflux regulating valve in the device of this invention.

[0023] This invention discloses a high-temperature anti-precipitation preheating device for corrosive gases. The device includes an execution module 5 and a vertically placed spiral tube 1. The corrosive gas passes through the spiral tube 1 from top to bottom. The spiral tube 1 is covered with an electric heating layer 2. The electric heating layer 2 heats the spiral tube 1 to a temperature higher than the temperature of the gas inside the tube, thereby creating a temperature gradient between the spiral tube 1 and the heated gas. An airflow regulating valve 3 is provided at the air inlet 9 of the spiral tube 1 to control the flow rate and volume of the input gas. A temperature sensor 4 is provided at the air outlet 10 of the spiral tube 1 to sense the temperature of the output gas. The execution module 5 is electrically connected to the electric heating layer 2, the airflow regulating valve 3, and the temperature sensor 4. The execution module 5 controls the operation of the electric heating layer 2 and the airflow regulating valve 3 based on the temperature sensed by the temperature sensor 4.

[0024] In this embodiment of the invention, the spiral tube 1 is placed vertically, and the corrosive gas is introduced into the spiral tube 1 from top to bottom. The airflow direction and the spiral tube 1 with its downward spiral slope structure can effectively prevent particle deposition.

[0025] In this embodiment of the invention, the electric heating layer 2 has a built-in heating wire. When the heating wire is energized, the electric heating layer heats the interior of the spiral tube 1, thereby heating the corrosive gas introduced into the spiral tube 1 to form a salt spray state. Furthermore, the airflow regulating valve 3 is controlled by a solenoid valve. The execution module 5 is preferably a control chip named / model STM32F429VET6. Through a programming process and circuit interface module, it realizes the electrical connection and control between the electric heating layer 2 and the airflow regulating valve 3. Specifically, the temperature sensor 4 senses the heated gas temperature, and the execution module 5 determines whether the temperature has reached the set temperature. The execution module 5 then controls the opening and closing of the solenoid valve of the airflow regulating valve 3 and the heating power of the electric heating layer 2. This invention, through feedback control of the electric heating layer 2 and the airflow regulating valve 3 by the temperature sensor 4, can effectively control the temperature of the heated gas, improve heating accuracy and efficiency, and enable the gas to reach the set temperature more efficiently and accurately.

[0026] In this embodiment of the invention, the heating layer heats the corrosive gas passing through the spiral tube 1. The temperature at which the heating layer heats the pipe is higher than the temperature of the heated gas. For example, if the set heating temperature of the gas in the spiral tube 1 is 800°C, the heating temperature of the heating layer is controlled at 1000°C. At this time, a temperature gradient can be formed between the pipe and the gas. Using thermophoretic force, the particles attached to the inner wall of the pipe move towards the center of the pipe, which can effectively prevent the particles from depositing in the pipe and improve the heating efficiency.

[0027] Furthermore, existing devices, which are mostly planar with perpendicular structures, are prone to uneven gas distribution, leading to uneven heating and localized overheating. In this embodiment of the invention, because the spiral tube 1 has inclined and arc-shaped structures, the gas can be evenly distributed and heated throughout the entire device. Moreover, while existing devices use distributed electric heaters for heating, this invention uses a heating layer that covers the entire outer wall of the spiral tube 1, providing continuous heating and heating the airflow from all directions throughout the entire process, resulting in uniform gas heating and improved heat exchange efficiency.

[0028] In this embodiment of the invention, the airflow regulating valve 3 is used to control the flow rate and volume of the corrosive gas. It is necessary to consider that while ensuring that the airflow rate effectively prevents particle deposition in the spiral tube 1, it is also necessary to avoid the flow rate being too fast, which would result in insufficient heating time to reach the required heating temperature.

[0029] In further implementation, given the gas flow rate and required gas heating temperature, to further prevent particle deposition within the spiral tube 1, in this embodiment of the invention, preferably, the spiral tube 1 is provided with a plurality of evenly distributed anti-particle deposition components 6. Each anti-particle deposition component 6 includes a guide column 6-1, on which a plurality of guide blades 6-2 are symmetrically distributed around the axis of the guide column 6-1. Guide grooves are formed between adjacent guide blades 6-2, and the guide column 6-1 is divided into adjacent parallel sections L1 and spiral sections L2. The guide grooves of the parallel section L1 are parallel to the axis of the guide column 6-1. In the direction away from the parallel section L1, each guide groove of the spiral section L2 twists around the axis. In this embodiment of the invention, the airflow inside the spiral tube 1 is relatively turbulent. Although the airflow direction is from top to bottom, the airflow direction inside the tube is not completely parallel to the tube wall. The parallel section L1 of the anti-particle deposition component 6 can first rectify the airflow into a parallel airflow, and then rotate the airflow direction through the spiral section L2. This can improve the airflow direction conversion effect. Furthermore, the anti-particle deposition component 6 makes the airflow into a spiral airflow, which stirs the airflow and redistributes the gas particles, making the gas distribution uniform and the heating uniform, thereby improving the heat exchange efficiency.

[0030] In further implementation, to ensure that the anti-particle deposition component 6 can be stably installed inside the spiral tube 1, in this embodiment of the invention, preferably, the anti-particle deposition component 6 further includes a washer 6-3 coaxial with the guide column 6-1; wherein, one end of the parallel section L1 is fixed to the washer 6-3, and the guide groove of the parallel section L1 is in communication with the hollow part of the washer 6-3. It is easy to understand that the washer 6-3 should be adapted to the inner wall of the spiral tube 1, and the washer 6-3 can play a good positioning role in the spiral tube 1.

[0031] In further implementation, to overcome the contradiction between the need for a high gas flow rate to prevent particle deposition, and the fact that an excessively high flow rate would result in insufficient gas heating time to reach the set heating temperature, the device preferably further includes a return pipe 7. The return pipe 7 is equipped with a return regulating valve 8, and both ends of the return pipe 7 are respectively connected to the top air inlet 9 and the bottom air outlet 10 of the spiral tube 1. The execution module 5 is electrically connected to the return regulating valve 8, and the execution module 5 controls the operation of the return regulating valve 8 based on the temperature sensed by the temperature sensor 4. In this embodiment, the return pipe 7 is connected to the top air inlet 9 and the bottom air outlet 10 of the spiral tube 1. In actual structure, this should be understood as follows: the top air inlet 9 of the spiral tube 1 should have an interface connecting to the outlet end of the return pipe 7, and the bottom air outlet 10 of the spiral tube 1 should have an interface connecting to the inlet end of the return pipe 7, forming a closed circulation pipeline between the spiral tube 1 and the return pipe 7. This means that the bottom air outlet 10 of the spiral tube 1 is in a closed state. In this embodiment of the invention, the reflux regulating valve 8 is also selected as a solenoid valve control. The gas temperature is sensed in real time at the gas outlet 10 of the spiral tube 1 by the temperature sensor 4. When the sensed temperature is lower than the set temperature, the execution module 5 controls the reflux regulating valve 8 to open. At this time, the corrosive gas flows back to the spiral tube 1 through the reflux pipe 7 for secondary heating to reach the set temperature. At the same time, the execution module 5 calculates and determines the optimal gas flow rate and velocity as well as the heating temperature of the heating layer. By controlling the gas flow rate and velocity input by the airflow regulating valve 3 and controlling the heating power of the heating layer, the frequency of this reflux heating can be reduced or avoided as much as possible, thereby improving the heating efficiency.

[0032] In this embodiment of the invention, the device is suitable for heating corrosive gases, more specifically, corrosive sulfur dioxide gas containing fine particles. Therefore, in a further implementation, preferably, the inner wall of the spiral tube 1, the inner wall of the return tube 7, the surface of the anti-particle deposition component 6, the surface of the return regulating valve 8 located in the return tube 7, and the surface of the airflow regulating valve 3 located in the spiral tube 1 are all coated with an anti-corrosion coating.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature anti-precipitation preheating device for corrosive gases, characterized in that, The device includes an execution module and a vertically positioned spiral tube through which corrosive gas flows from top to bottom. The spiral tube is covered with an electric heating layer, which heats the spiral tube to a temperature higher than the gas temperature inside the tube, creating a temperature gradient between the spiral tube and the heated gas. An airflow regulating valve is installed at the inlet of the spiral tube to control the flow rate and velocity of the input gas. A temperature sensor is installed at the outlet of the spiral tube to sense the temperature of the output gas. The execution module is electrically connected to the electric heating layer, the airflow regulating valve, and the temperature sensor, and controls the operation of the electric heating layer and the airflow regulating valve based on the temperature sensed by the temperature sensor. The spiral tube is provided with a plurality of evenly distributed anti-particle deposition components. Each anti-particle deposition component includes a guide column, and the guide column is provided with a plurality of guide blades symmetrically distributed around the axis of the guide column. A guide groove is formed between adjacent guide blades, and the guide column is divided into adjacent parallel sections and spiral sections. The guide grooves of the parallel sections are parallel to the axis of the guide column. In the direction away from the parallel sections, each guide groove of the spiral section is twisted around the axis.

2. The apparatus as claimed in claim 1, characterized in that, The anti-particle deposition component also includes a washer coaxial with the flow guide column; wherein, one end of the parallel section is fixed on the washer, and the flow guide groove of the parallel section is in communication with the hollow part of the washer.

3. The apparatus as described in claim 1 or 2, characterized in that, The device also includes a reflux pipe, on which a reflux regulating valve is provided, and both ends of the reflux pipe are respectively connected to the air inlet at the top end and the air outlet at the bottom end of the spiral tube; wherein, the execution module is electrically connected to the reflux regulating valve, and the execution module controls the operation of the reflux regulating valve according to the temperature sensed by the temperature sensor.

4. The apparatus as described in claim 3, characterized in that, The inner wall of the spiral tube, the inner wall of the return tube, the surface of the anti-particle deposition component, the surface of the component with the return regulating valve located in the return tube, and the surface of the component with the airflow regulating valve located in the spiral tube are all coated with an anti-corrosion coating.

5. The apparatus as claimed in claim 1, characterized in that, The corrosive gas is sulfur dioxide gas containing fine corrosive particles.

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