Industrial furnace with automatic ignition

Abstract

The utility model relates to industrial furnace technical field, specifically disclose a kind of industrial furnace with automatic ignition device, including industrial furnace body and exhaust duct, further include: adjustable ignition unit of position, including setting in the ceramic lighter head of exhaust duct and installing the drive mechanism outside exhaust duct;Infrared gas sensor is installed in the inside first end of exhaust duct;Flame detector is installed at 20-50mm behind the ceramic lighter head;Oxygen content sensor, by dynamically adjusting ignition position and voltage intensity, significantly improve waste gas ignition efficiency, avoid low concentration ignition failure or high concentration combustion insufficient;Safety interlock unit integrates flame condition and oxygen content double monitoring, eliminate unburnt exhaust gas leakage hidden danger, high-temperature transmission structure and heat insulation design guarantee the reliability of core components under extreme working conditions, substantially reduce maintenance cost, overall structure is compact and strong adaptability, provide safe, efficient, maintenance-free waste gas treatment solution for industrial furnace.

Description

Technical Field

[0001] This utility model relates to the field of industrial furnace technology, and specifically discloses an industrial furnace with an automatic ignition device. Background Technology

[0002] Industrial furnaces often generate waste gases containing flammable gases (such as carbon monoxide and methane) and harmful gases during production. Direct emission of these gases can cause environmental pollution and explosion risks. Therefore, automatic ignition devices are widely used in industrial furnace waste gas treatment systems, using high-voltage electric sparks to ignite the flammable components in the waste gas, achieving harmless incineration.

[0003] Traditional automatic ignition devices typically consist of a power supply, a time relay, a step-up transformer, and a fixed ceramic igniter. Their working principle is to trigger ignition through timing control. For example, a DC power supply is used to generate high voltage through an oscillator, a step-up circuit, and a rectifier circuit, which drives the ceramic igniter to produce an electric spark in the exhaust pipe. Although such devices have initially achieved the transformation from manual ignition to automation, the core components, such as the ceramic igniter, are mostly fixed in a single position in the exhaust pipe and rely on a preset time relay to control the ignition cycle, lacking adaptability to dynamic changes in exhaust gas concentration.

[0004] Fixed ignition heads cannot adjust their position according to airflow distribution, resulting in failure to ignite low-concentration exhaust gases or incomplete combustion of high-concentration exhaust gases, leading to low ignition efficiency. Although equipped with a basic flame detector, it lacks linkage control with oxygen content monitoring, and cannot identify the risk of unburned exhaust gas leakage caused by flameout or lack of oxygen in real time. The time relay control mode cannot respond to fluctuations in exhaust gas concentration, resulting in energy waste. Utility Model Content

[0005] This invention proposes an industrial furnace with an automatic ignition device, which significantly improves the ignition efficiency of exhaust gas by dynamically adjusting the ignition position and voltage intensity, avoiding ignition failure at low concentrations or incomplete combustion at high concentrations.

[0006] This utility model is implemented as follows: an industrial furnace with an automatic ignition device includes an industrial furnace body and an exhaust pipe, and further includes: The position-adjustable ignition unit includes a ceramic igniter disposed inside the exhaust pipe and a drive mechanism mounted outside the exhaust pipe. An infrared gas sensor is installed at the inner end of the exhaust pipe. A flame detector is installed 20-50mm behind the ceramic igniter head; An oxygen content sensor is installed at the inner end of the exhaust pipe; A concentration controller is electrically connected to the infrared gas sensor; The safety interlock unit is electrically connected to the flame detector and the oxygen content sensor; An adaptive power supply module is electrically connected to the ceramic igniter head.

[0007] As a preferred embodiment of the present invention, an industrial furnace with an automatic ignition device, the stirring assembly includes a plurality of rotating rods rotatably connected to the outer wall of a first rotating shaft via hinges. Stirring blades are fixedly connected to the outer walls of the plurality of rotating rods. Second connecting shafts are fixedly connected to the outer walls of the plurality of rotating rods. Fourth connecting rods are rotatably connected to the outer walls of the plurality of second connecting shafts. The other end of the third connecting rod is rotatably connected to the uppermost second connecting shaft.

[0008] In a preferred embodiment of this utility model, an industrial furnace with an automatic ignition device is provided, wherein the concentration controller is electrically connected to the drive mechanism and to the adaptive power supply module.

[0009] In a preferred embodiment of this utility model, an industrial furnace with an automatic ignition device is provided, wherein the driving mechanism is an electric actuator or a linear motor.

[0010] As a preferred embodiment of the present invention, an industrial furnace with an automatic ignition device is provided, wherein the output end of the drive mechanism is fixedly connected to a high-temperature resistant transmission shaft, the high-temperature resistant transmission shaft penetrates the outer wall of the exhaust pipe and is fixedly connected to a ceramic igniter head, and a dynamic seal is provided at the junction of the high-temperature resistant transmission shaft and the exhaust pipe.

[0011] As a preferred embodiment of the present invention, an industrial furnace with an automatic ignition device is provided, wherein the surface of the ceramic igniter head is coated with a platinum-rhodium alloy coating, and the output voltage of the adaptive power supply module is adjustable from 10 to 15 kV.

[0012] As a preferred embodiment of the present invention, an industrial furnace with an automatic ignition device further includes an electrode diagnostic module. The input end of the electrode diagnostic module is electrically connected to the ceramic ignition head, and the output end is electrically connected to an external alarm device.

[0013] In a preferred embodiment of this utility model of an industrial furnace with an automatic ignition device, the drive mechanism is fixedly connected to the outer wall of the exhaust pipe via a heat-insulating bracket.

[0014] The beneficial effects of this utility model are: This invention significantly improves the ignition efficiency of waste gas by dynamically adjusting the ignition position and voltage intensity, avoiding ignition failure at low concentrations or incomplete combustion at high concentrations. The safety interlock unit integrates dual monitoring of flame status and oxygen content to eliminate the risk of unburned waste gas leakage. The high-temperature resistant transmission structure and heat insulation design ensure the reliability of core components under extreme operating conditions. The online electrode status diagnostic function provides early warning of wear and tear, greatly reducing maintenance costs. The overall structure is compact and highly adaptable, providing a safe, efficient, and maintenance-free waste gas treatment solution for industrial furnaces. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a cross-sectional view of the exhaust pipe of this utility model.

[0017] The markings in the diagram are: 1. Industrial furnace body; 2. Exhaust pipe; 3. Ceramic igniter head; 4. Drive mechanism; 5. Infrared gas sensor; 6. Flame detector; 7. Oxygen content sensor; 8. Concentration controller; 9. Safety interlock unit; 10. Adaptive power supply module; 11. Electrode diagnostic module; 12. Heat insulation bracket; 13. High-temperature resistant drive shaft. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0019] Please see Figure 1-2 An industrial furnace with an automatic ignition device includes an industrial furnace body 1 and an exhaust pipe 2, and further includes: The position-adjustable ignition unit includes a ceramic igniter 3 disposed inside the exhaust pipe 2 and a drive mechanism 4 installed outside the exhaust pipe 2; Infrared gas sensor 5 is installed at the inner end of exhaust pipe 2; Flame detector 6 is installed 20-50mm behind the ceramic igniter head 3; Oxygen content sensor 7 is installed at the inner end of exhaust pipe 2; The concentration controller 8 is electrically connected to the infrared gas sensor 5; Safety interlock unit 9 is electrically connected to flame detector 6 and oxygen content sensor 7; The adaptive power module 10 is electrically connected to the ceramic igniter head 3.

[0020] In this embodiment: Infrared gas sensor 5 detects the concentration of exhaust gas at the beginning of exhaust pipe 2 and transmits it to concentration controller 8. Concentration controller 8 outputs a position command to drive mechanism 4 according to a preset threshold. Drive mechanism 4 pushes ceramic igniter head 3 to the target position via high-temperature resistant transmission shaft 13 (located at the first 1 / 3 of the pipe when the concentration is ≤3%LEL, and moved to the second 2 / 3 when the concentration is >3%LEL). The output voltage of adaptive power module 10 is adjusted synchronously (0.5kV increase for every 1%LEL increase in concentration). The high-voltage current causes ceramic igniter head 3 to generate an electric spark to ignite the exhaust gas; flame Detector 6 monitors the ignition status in real time. If ignition is successful, the flame signal is continuously fed back to the safety interlock unit 9. If the flame is abnormally extinguished or the oxygen content sensor 7 detects that the oxygen content at the tail end is <15%, the safety interlock unit 9 cuts off the adaptive power module 10 within 0.5 seconds. Electrode diagnostic module 11 continuously collects the working current of the ignition head. When the peak value drops by >20%, it outputs a maintenance signal to the external alarm. This achieves dynamic position-voltage dual-adjustment ignition, eliminates the positional limitations and energy waste of fixed ignition, and blocks the risk of unburned exhaust gas leakage through triple safety interlock.

[0021] As a technical optimization of this utility model, the concentration controller 8 is electrically connected to the drive mechanism 4 and to the adaptive power supply module 10.

[0022] In this embodiment, the concentration controller 8 is linked with the drive mechanism 4 and the adaptive power module 10 to achieve coordinated optimization of position and voltage. When the concentration is low, the voltage is reduced and the ignition distance is shortened. When the concentration is high, the voltage is increased and the ignition range is expanded, thus solving the problems of energy waste and ignition lag.

[0023] As a technical optimization of this utility model, the drive mechanism 4 is an electric actuator or a linear motor.

[0024] In this embodiment, the drive mechanism 4, which consists of an electric actuator or a linear motor, provides high-temperature resistant power output (>150℃) to ensure transmission stability.

[0025] As a technical optimization of this utility model, the output end of the drive mechanism 4 is fixedly connected to a high-temperature resistant transmission shaft 13, which penetrates the outer wall of the exhaust pipe 2 and is fixedly connected to the ceramic igniter head 3. A dynamic seal is provided at the intersection of the high-temperature resistant transmission shaft 13 and the exhaust pipe 2.

[0026] In this embodiment: the high-temperature resistant drive shaft 13 penetrates the pipe wall through a dynamic seal to block the heat conduction at 600℃ to the external mechanism and prevent the drive mechanism 4 from overheating and failing.

[0027] As a technical optimization of this utility model, the surface of the ceramic igniter head 3 is coated with a platinum-rhodium alloy coating, and the output voltage of the adaptive power module 10 is adjustable from 10 to 15kV.

[0028] In this embodiment: the platinum-rhodium alloy coating enables the ceramic igniter head 3 to withstand high-temperature corrosion of 1100℃, and the 10-15kV adjustable voltage of the adaptive power module 10 matches different concentrations, reducing electrode loss.

[0029] As a technical optimization of this utility model, it also includes an electrode diagnostic module 11, the input end of which is electrically connected to the ceramic igniter head 3, and the output end is electrically connected to an external alarm device.

[0030] In this embodiment, the electrode diagnostic module 11 monitors the electrical characteristics (such as resistance and discharge status) of the ceramic igniter head 3 in real time, and issues an alarm in a timely manner when the ceramic igniter head 3 ages, accumulates carbon, or fails, prompting maintenance, reducing the risk of ignition failure caused by ignition electrode failure, and improving system reliability.

[0031] As a technical optimization of this utility model, the drive mechanism 4 is fixedly connected to the outer wall of the exhaust pipe 2 through the heat insulation bracket 12.

[0032] In this embodiment, the heat insulation bracket 12 is made of heat insulation material, which reduces the operating temperature of the drive mechanism 4 and extends the equipment life.

[0033] The working principle and usage process of this utility model: The exhaust gas generated by the industrial furnace body 1 enters the exhaust pipe 2. The infrared gas sensor 5 located at the beginning of the pipe detects the concentration of combustible gas in the exhaust gas in real time and transmits the signal to the concentration controller 8. The concentration controller 8 calculates the optimal ignition position and required ignition voltage of the ceramic igniter head 3 under the current exhaust gas conditions based on the received concentration signal, and outputs control commands. On the one hand, the commands drive the drive mechanism 4 (such as an electric actuator or linear motor) to move. The drive mechanism 4 drives the ceramic igniter head 3 to move to the designated position in the exhaust pipe 2 through the high-temperature resistant transmission shaft 13. On the other hand, the commands are sent to the adaptive power module 10, which outputs a high voltage of a corresponding value (10-15kV range). The high voltage is applied to the ceramic igniter head 3 that has been positioned, and the voltage is applied to its tip. The ceramic igniter head 3 generates an electric spark to ignite the flowing exhaust gas. A flame detector 6, installed 20-50mm behind the ceramic igniter head 3, monitors in real time whether the flame has been successfully established and is burning stably. At the same time, an oxygen content sensor 7 located at the end of the exhaust pipe 2 monitors the residual oxygen content in the exhaust gas after combustion. The signals from the flame detector 6 and the oxygen content sensor 7 are input to the safety interlock unit 9. The safety interlock unit 9 continuously analyzes these signals. If it detects that the flame has been extinguished or the oxygen content has decreased abnormally (indicating incomplete combustion or possible flameout), it immediately triggers the safety interlock to cut off the fuel or exhaust gas source of the industrial furnace body 1 and prevent unburned exhaust gas from leaking. In addition, the electrode diagnostic module 11 continuously monitors the working status parameters of the ceramic igniter head 3. Once an abnormality is detected (such as open circuit, short circuit, or performance degradation), it issues an alarm signal.

[0034] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. An industrial furnace with an automatic ignition device, comprising an industrial furnace body (1) and an exhaust pipe (2), characterized in that: Also includes: The position-adjustable ignition unit includes a ceramic igniter (3) disposed in the exhaust pipe (2) and a drive mechanism (4) installed outside the exhaust pipe (2). An infrared gas sensor (5) is installed at the inner end of the exhaust pipe (2); A flame detector (6) is installed 20-50 mm behind the ceramic igniter (3); An oxygen content sensor (7) is installed at the inner end of the exhaust pipe (2); The concentration controller (8) is electrically connected to the infrared gas sensor (5); The safety interlock unit (9) is electrically connected to the flame detector (6) and the oxygen content sensor (7); The adaptive power supply module (10) is electrically connected to the ceramic igniter head (3); The output end of the drive mechanism (4) is fixedly connected to a high-temperature resistant transmission shaft (13). The high-temperature resistant transmission shaft (13) passes through the outer wall of the exhaust pipe (2) and is fixedly connected to the ceramic igniter head (3). A dynamic seal is provided at the intersection of the high-temperature resistant transmission shaft (13) and the exhaust pipe (2).

2. An industrial furnace with an automatic ignition device according to claim 1, characterized in that: The concentration controller (8) is electrically connected to the drive mechanism (4) and to the adaptive power module (10).

3. An industrial furnace with an automatic ignition device according to claim 1, characterized in that: The drive mechanism (4) is an electric actuator or a linear motor.

4. An industrial furnace with an automatic ignition device according to claim 1, characterized in that: The surface of the ceramic igniter (3) is coated with a platinum-rhodium alloy coating, and the output voltage of the adaptive power module (10) is adjustable from 10 to 15 kV.

5. An industrial furnace with an automatic ignition device according to claim 1, characterized in that: It also includes an electrode diagnostic module (11), the input end of which is electrically connected to the ceramic igniter (3), and the output end is electrically connected to an external alarm device.

6. An industrial furnace with an automatic ignition device according to claim 1, characterized in that: The drive mechanism (4) is fixedly connected to the outer wall of the exhaust pipe (2) via a heat insulation bracket (12).

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