Energy-saving electric heater device for flue gas denitration
By using a spiral heating tube and rectangular ventilation duct design, combined with a double-shell structure, the problems of high energy consumption and heat loss in traditional electric heaters are solved, achieving energy saving and efficient heating in the flue gas denitrification process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN SYLT ENVIRONMENT TECH ENG
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional electric heaters consume a lot of energy and have low thermal efficiency in flue gas denitrification processes. They also lack effective thermal management methods, resulting in serious heat loss and making it difficult to meet energy conservation and emission reduction requirements.
The design employs a spiral heating tube and a rectangular spiral ventilation duct, combined with a double-shell structure, to ensure full contact between the flue gas and the heat-conducting cylinder and reduce heat loss. The modular design improves structural strength and assembly efficiency.
It significantly improved thermal energy utilization, reduced energy consumption, achieved energy-saving goals, and extended equipment lifespan.
Smart Images
Figure CN224580292U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of flue gas denitrification devices, specifically an energy-saving electric heater device for flue gas denitrification. Background Technology
[0002] In current industrial production, flue gas denitrification technology is widely used to reduce nitrogen oxide emissions. Among these, common denitrification processes such as selective catalytic reduction (SCR) have strict requirements on flue gas temperature. Typically, the flue gas needs to be heated to a specific temperature range to ensure efficient denitrification within the denitrification reactor for treating industrial waste gas. Traditional electric heaters generally suffer from high energy consumption during flue gas heating. On the one hand, the flue gas passes through the electric heater at a relatively high speed, making it difficult for the heating element to fully absorb the heat energy, resulting in low heat utilization and wasted energy. On the other hand, to ensure the flue gas temperature meets requirements, there is a lack of effective thermal management methods, leading to significant heat loss. This not only significantly increases enterprise operating costs but also contradicts the development trend of energy conservation and emission reduction, failing to meet increasingly stringent environmental protection and energy-saving requirements. Utility Model Content
[0003] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide an energy-saving electric heater device for flue gas denitrification. This device employs spiral heating tubes evenly distributed along the inner wall of a heat-conducting cylinder, ensuring uniform heating. The rectangular spiral ventilation duct design allows the flue gas to fully contact the heat-conducting cylinder as it flows around it, creating a uniform heat exchange environment and preventing localized overheating or heating blind spots, thus ensuring the flue gas is fully heated. The shell of this energy-saving electric heater device adopts a double-layer structure to reduce heat loss.
[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an energy-saving electric heater device for flue gas denitrification, comprising a shell, a ventilation duct, and an electric heating component;
[0005] The electric heating assembly includes a heat-conducting cylinder, a heating tube, and a heating base; the heating base is fixed to the end of the heat-conducting cylinder, the end of the heating tube is connected to the heating base, and the heating tube is located inside the heat-conducting cylinder.
[0006] The ventilation duct is a spiral duct with a rectangular cross-section. The ventilation duct is arranged around the heat-conducting cylinder. The shell is fitted over the ventilation duct, and the outer wall of the ventilation duct is attached and fixed to the inner wall of the shell. The lower end of the ventilation duct is also connected to a baffle plate, which has multiple baffle holes that communicate with the ventilation duct.
[0007] The shell body is provided with a protective cover and an air inlet cone at both ends, and the protective cover and the air inlet cone are respectively provided with a smoke inlet and a smoke outlet.
[0008] Furthermore, the heating tube has a spiral structure and is attached to the inner wall of the heat-conducting cylinder.
[0009] Furthermore, the top of the heat-conducting cylinder is also provided with a mounting plate, and the heating seat is fixed on the mounting plate.
[0010] Furthermore, the mounting plate is also provided with a protective cover, which is fixed to the mounting plate and covers the heating seat.
[0011] Furthermore, the shell body includes an outer shell and an inner shell, with a heat insulation cavity formed between the outer shell and the inner shell, and the heat insulation cavity is in a vacuum or negative pressure state.
[0012] Furthermore, the housing also includes an upper flange ring and a lower flange ring, with the upper and lower ends of the outer housing and the inner housing respectively connected to the upper flange ring and the lower flange ring.
[0013] Furthermore, the lower end of the air inlet cone is used to connect to the smoke inlet duct, and the smoke inlet duct is equipped with an axial flow fan, which is used to input the smoke and dust to be treated from the air inlet cone into the ventilation duct.
[0014] Furthermore, the outer wall of the shell and the outer wall of the protective cover are also provided with a heat-insulating wrapping layer.
[0015] Furthermore, the heat insulation wrapping layer is made of ceramic fiber felt.
[0016] Furthermore, the outer wall of the protective cover is also equipped with a temperature sensor, and the inside of the protective cover is also equipped with a heating controller, which is connected to the protective cover and the heating base.
[0017] The beneficial effects of this energy-saving electric heater device for flue gas denitrification are as follows: The energy-saving electric heater device includes a shell, a ventilation duct, and an electric heating component; the electric heating component includes a heat-conducting cylinder, a heating tube, and a heating base; the heating base is fixed to the end of the heat-conducting cylinder, and the heating tube is located inside the heat-conducting cylinder; the ventilation duct is a spiral duct with a rectangular cross-section, and the ventilation duct is arranged around the heat-conducting cylinder, with the shell sleeved outside the ventilation duct, and the outer wall of the ventilation duct attached and fixed to the inner wall of the shell; the spiral heating tube of the electric heating component is evenly distributed along the inner wall of the heat-conducting cylinder, so that the heat-conducting cylinder can heat up evenly, so that the heat is concentrated and transferred to the flue gas, avoiding ineffective heat radiation and significantly improving thermal efficiency. The design of the rectangular spiral ventilation duct allows the flue gas to fully contact the heat-conducting cylinder during the flow around the heat-conducting cylinder, forming a uniform heat exchange environment, avoiding local overheating or heating blind spots, and ensuring that the flue gas can be fully heated.
[0018] The energy-saving electric heater device features a double-layered shell structure, forming a vacuum or negative pressure insulation cavity between the outer and inner shells, significantly reducing heat loss to the outside. Simultaneously, the ceramic fiber felt insulation layer on the outer wall of the shell and the outer wall of the protective cover further enhances insulation performance and reduces heat loss. Furthermore, the spiral heating tubes are tightly fitted against the inner wall of the heat-conducting cylinder, concentrating heat transfer to the flue gas, avoiding ineffective heat radiation, significantly improving thermal efficiency, and achieving energy-saving goals.
[0019] The shell of this energy-saving electric heater is connected to the inner shell via an upper flange ring and a lower flange ring, respectively. This modular design simplifies the assembly process and enhances the overall structural strength. The standardized interface design of the air inlet cone and the protective cover facilitates quick docking with the flue gas duct and the denitrification reactor. The heating seat is fixed to the mounting plate at the end of the heat-conducting cylinder, and the protective cover provides effective protection for it, preventing the flue gas from corroding the heating element and extending the service life of the equipment. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of an energy-saving electric heater device for flue gas denitrification according to an embodiment of this utility model.
[0021] Figure 2 This is a schematic diagram of the first connection structure between the ventilation duct and the heating component of an energy-saving electric heater device for flue gas denitrification according to an embodiment of this utility model.
[0022] Figure 3 This is a schematic diagram of the second connection structure between the ventilation duct and the heating component of an energy-saving electric heater device for flue gas denitrification according to an embodiment of this utility model.
[0023] Figure 4 This is a schematic diagram of the third connection structure between the ventilation duct and the heating component of an energy-saving electric heater device for flue gas denitrification according to an embodiment of this utility model.
[0024] Figure 5 This is a partial structural cross-sectional schematic diagram of an energy-saving electric heater device for flue gas denitrification according to an embodiment of this utility model.
[0025] In the above figure: 1-shell body, 11-outer shell body, 12-inner shell body, 13-insulation cavity, 14-upper flange ring, 15-lower flange ring; 2-ventilation duct, 21-duct inlet, 22-duct outlet, 3-heat-conducting cylinder body, 31-mounting base plate, 31-heating tube, 32-protective cover, 33-heating tube, 4-turbulence baffle, 41-turbulence hole, 5-exhaust cone, 61-inlet cone. Detailed Implementation
[0026] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0027] Please refer to Figures 1 to 5 This utility model discloses an energy-saving electric heater device for flue gas denitrification, comprising a housing 1, a ventilation duct 2, and an electric heating component.
[0028] The electric heating assembly includes a heat-conducting cylinder 3, a heating tube 33, and a heating base (not shown in the figure); wherein the heating tube 33 is an electric heating tube, the heating base is fixed to the end of the heat-conducting cylinder 3, the end of the heating tube 33 is connected to the heating base, and the heating tube 33 is located inside the heat-conducting cylinder 3. The ventilation duct 2 is a spiral duct with a rectangular cross-section, the ventilation duct 2 is arranged around the heat-conducting cylinder 3, the shell 1 is fitted over the ventilation duct 2, and the outer wall of the ventilation duct 2 is attached and fixed to the inner wall of the shell 1. The two ends of the ventilation duct 2 are the ventilation inlet and the ventilation outlet, respectively.
[0029] Specifically, the top of the heat-conducting cylinder 3 is also provided with a circular mounting plate 31, which closes the upper end of the heat-conducting cylinder 3, and the heating seat is fixed on the mounting plate 31. The heating tube 33 has a spiral structure and is attached to and fixed to the inner wall of the heat-conducting cylinder 3, so that the heating tube 33 can be in full contact with the heat-conducting cylinder 3. The heat-conducting cylinder 3 is made of aluminum or copper with good thermal conductivity, so that the heat-conducting cylinder 3 can be heated evenly under the heating action of the heating tube 33, thereby heating the ventilation duct 2, and then heating the flue gas passing through the ventilation duct 2.
[0030] The end of the heating tube 33 passes through the mounting plate 31 and is connected to the heating seat. The mounting plate 31 is also provided with a protective cover 32. The protective cover 32 is fixed on the mounting plate 31 and covers the heating seat. Understandably, the heating seat is connected to an external power source through a wire wrapped with heat-resistant material.
[0031] The rectangular spiral ventilation duct design of this device ensures that the flue gas makes full contact with the heat-conducting cylinder as it flows around it, creating a uniform heat exchange environment. This avoids localized overheating or heating blind spots, guaranteeing that the flue gas is fully heated. The spiral heating tubes are tightly attached to the inner wall of the heat-conducting cylinder, concentrating heat transfer to the flue gas, avoiding ineffective heat radiation, significantly improving thermal efficiency, and achieving energy-saving goals.
[0032] The lower end of the ventilation duct 2 is also connected to a baffle 4, which is a circular plate. The baffle 4 seals the lower end of the heat-conducting cylinder 3, so that both the upper and lower ends of the heat-conducting cylinder 3 are in a closed state, preventing flue gas from entering the heat-conducting cylinder 3 and adhering to the heating pipe 33. The part of the baffle 4 connected to the ventilation inlet is provided with multiple baffle holes 41 that connect to the ventilation duct 2. The baffle holes 41 allow flue gas to enter the ventilation duct 2 and promote the uniform distribution of flue gas.
[0033] In a preferred embodiment, the housing 1 includes an outer shell 11, an inner shell 12, an upper flange ring 14, and a lower flange ring 15. The outer shell 11 and the inner shell 12 are coaxially stacked, and their upper and lower ends are respectively connected to the upper flange ring 14 and the lower flange ring 15, thereby forming a heat insulation cavity 13 between the outer shell 11 and the inner shell 12. The heat insulation cavity 13 is in a vacuum or negative pressure state. The vacuum or negative pressure state of the heat insulation cavity 13 can reduce the heat conducted outward from the ventilation duct 2 and reduce its heat loss.
[0034] The ventilation duct of this device is a rectangular spiral duct. The ventilation duct is arranged around the heat-conducting cylinder. The design of the rectangular spiral ventilation duct allows the flue gas to fully contact the heat-conducting cylinder during the flow around the heat-conducting cylinder, forming a uniform heat exchange environment, avoiding local overheating or heating blind spots, and ensuring that the flue gas can be fully heated.
[0035] The shell of this energy-saving electric heater is connected to the inner shell via an upper flange ring and a lower flange ring, respectively. This modular design simplifies the assembly process and enhances the overall structural strength. The standardized interface design of the air inlet cone and the protective cover facilitates quick connection with the smoke inlet pipe and the smoke exhaust system. The heating seat is fixed to the mounting plate at the end of the heat-conducting cylinder, and the protective cover provides effective protection for it, reducing the corrosion of the heating seat by flue gas and water vapor and extending the service life of the equipment.
[0036] In a more preferred embodiment, the outer wall of the housing 1 and the outer wall of the protective cover 32 are further provided with a heat-insulating wrapping layer (not shown in the figure). The heat-insulating wrapping layer is made of ceramic fiber felt. The heat-insulating wrapping layer can further improve the heat insulation performance and reduce the heat loss of the electric heater device.
[0037] The shell body 1 has an exhaust cone 5 and an inlet cone 61 at both ends. The lower end of the inlet cone 61 and the exhaust cone 5 are connected by a flange. The lower end of the inlet cone 61 and the upper end of the exhaust cone 5 are respectively provided with a smoke inlet and a smoke outlet, both of which are equipped with connecting flanges. The smoke inlet at the lower end of the inlet cone 61 is connected to a smoke inlet duct during operation. An axial flow fan is installed in the smoke inlet duct. The axial flow fan is used to input the flue gas to be treated from the inlet cone 61 into the ventilation duct 2. The smoke outlet at the upper end of the exhaust cone 5 is connected to the denitrification reactor. The exhaust cone 5 is used to introduce the heated flue gas to be treated into the denitrification reactor.
[0038] The shell of this energy-saving electric heater is connected to the inner shell via an upper flange ring and a lower flange ring, respectively. This modular design simplifies the assembly process and enhances the overall structural strength. The standardized interface design of the air inlet cone and the protective cover facilitates quick docking with the flue gas duct and the denitrification reactor.
[0039] In a preferred embodiment, a temperature sensor is also provided on the outer wall of the protective cover 32, and a heating controller is also provided inside the protective cover 32 (the temperature sensor and the heating controller are not shown in the figure). The heating controller is connected to the protective cover 32 and the heating base 3. The heating controller is used to sense the temperature of the passing flue gas in real time through the temperature sensor and adjust the heating power of the heating tube 33 according to the temperature value. It should be noted that the connection structure and working principle of the temperature sensor and the heating controller are existing technologies and will not be described in detail here.
[0040] The working process of this energy-saving electric heater device for flue gas denitrification is as follows: An axial flow fan transports the flue gas in the inlet duct into the inlet cone 61. The flue gas in the inlet cone 61 passes through the turbulence hole 41 and enters the ventilation duct 2, then flows spirally along the ventilation duct 2. The heating tube 33 heats the ventilation duct 2 to a predetermined temperature. The flue gas is gradually heated to a high temperature as it flows spirally along the ventilation duct 2, and then enters the denitrification reactor through the exhaust cone 5. The heating controller senses the temperature of the flue gas in real time through a temperature sensor located at the top of the ventilation duct 2. If the temperature is too high, the heating controller reduces the heating power of the heating tube 33; if the flue gas temperature is too low, the heating controller increases the heating power of the heating tube 33. This ensures that the temperature entering the denitrification reactor meets the requirements of the denitrification reaction and prevents excessively high flue gas temperature from causing excessive energy consumption.
[0041] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.
[0042] Where there is no conflict, the above embodiments and features described herein can be combined with each other.
[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An energy-saving electric heater device for flue gas denitration, characterized in that, It includes a housing (1), a ventilation duct (2), and an electric heating assembly; The electric heating assembly includes a heat-conducting cylinder (3), a heating tube (32), and a heating base; the heating base is fixed to the end of the heat-conducting cylinder (3), the end of the heating tube (32) is connected to the heating base, and the heating tube (32) is located inside the heat-conducting cylinder (3); The ventilation duct (2) is a spiral duct with a rectangular cross-section. The ventilation duct (2) is arranged around the heat-conducting cylinder (3). The shell (1) is fitted around the ventilation duct (2). The outer wall of the ventilation duct (2) is attached and fixed to the inner wall of the shell (1). The lower end of the ventilation duct (2) is also connected to the baffle (4). The baffle (4) is provided with a plurality of baffle holes (41) that communicate with the ventilation duct (2). The shell body (1) is provided with a protective cover (33) and an air inlet cone (61) at both ends, and the protective cover (33) and the air inlet cone (61) are respectively provided with a smoke inlet and a smoke outlet.
2. The energy-saving electric heater device for flue gas denitration according to claim 1, characterized in that, The heating tube (32) has a spiral structure and is attached to the inner wall of the heat-conducting cylinder (3).
3. The energy-saving electric heater device for flue gas denitration according to claim 1, characterized in that, The top of the heat-conducting cylinder (3) is also provided with a mounting plate (31), and the heating seat is fixed on the mounting plate (31).
4. The energy-saving electric heater device for flue gas denitration according to claim 3, characterized in that, The mounting base plate (31) is also provided with a protective cover (33), which is fixed on the mounting base plate (31) and covers the heating seat.
5. The energy-saving electric heater device for flue gas denitration according to claim 1, characterized in that, The shell body (1) includes an outer shell (11) and an inner shell (12), and a heat insulation cavity (13) is formed between the outer shell (11) and the inner shell (12), and the heat insulation cavity (13) is in a vacuum or negative pressure state.
6. The energy-saving electric heater device for flue gas denitration according to claim 1, characterized in that, The shell body (1) also includes an upper flange ring (14) and a lower flange ring (15), with the upper and lower ends of the outer shell body (11) and the inner shell body (12) respectively connected to the upper flange ring (14) and the lower flange ring (15).
7. The energy-saving electric heater device for flue gas denitration according to claim 1, characterized in that, The lower end of the air inlet cone (61) is used to connect to the smoke inlet pipe. An axial flow fan is installed in the smoke inlet pipe. The axial flow fan is used to input the smoke and dust to be treated from the air inlet cone (61) into the ventilation pipe (2).
8. The energy-saving electric heater device for flue gas denitration according to claim 1, characterized in that, The outer wall of the shell (1) and the outer wall of the protective cover (33) are also provided with a heat insulation wrapping layer.
9. The energy-saving electric heater device for flue gas denitration according to claim 8, characterized in that, The heat insulation wrapping layer is made of ceramic fiber felt.
10. The energy-saving electric heater device for flue gas denitration according to claim 1, characterized in that, The outer wall of the protective cover (33) is also provided with a temperature sensor, and the inside of the protective cover (33) is also provided with a heating controller, which is connected to the protective cover (33) and the heating base.