Novel industrial kiln ignition system

Abstract

The invention discloses a novel industrial kiln ignition system, and relates to the technical field of ignition needles, the novel industrial kiln ignition system comprises a combustor, an air-fuel supply system, a control system and a fan system, the combustor is connected with the output end of the air-fuel supply system through a pipeline, and the air-fuel supply system and the fan system are electrically connected with the output end of the control system. An ignition probe is installed in the combustor and comprises an ignition needle with a flame stabilizing and monitoring function and a detection needle with a pressure monitoring function and a gas content monitoring function, and the ignition needle and the detection needle are both electrically connected with the control system. According to the system, the double-needle ignition probe with the detection effect is utilized, ignition and ion flame-out protection can be intelligently completed, the working condition in the furnace is monitored in real time, the air-fuel ratio and the fan system are intelligently controlled through the control system, and the optimal combustion effect and the optimal safety protection effect can be achieved without manual assistance.

Description

Technical Field

[0001] The invention belongs to the technical field of ignition needles, and in particular relates to a novel industrial furnace ignition system. Background Art

[0002] At present, the ignition system of the burner in the industrial kiln industry adopts a single procedure, that is, the ignition is performed by a single ignition needle assisted by manual assistance. However, in the actual firing process, there are often problems such as insufficient combustion, accidental flameout, and ignition difficulties caused by low-end discharge due to the partial exposure of the middle part of the existing ignition needle. If the problem cannot be discovered in time and the corresponding response is not made, it may lead to poor product quality or even the product cannot be used; and due to the harsh environment of industrial kilns, SO2, HF and other waste gases generated during the roasting process will accelerate the aging of the protective layer of the power cord, and there may be a risk of leakage, causing certain harm to personal safety. Summary of the invention

[0003] In view of the problems mentioned in the background technology, the purpose of the present invention is to provide a new type of industrial furnace ignition system to solve the problems mentioned in the background technology.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A novel industrial kiln ignition system includes a burner, an air-fuel supply system, a control system and a fan system. The burner is connected to the output end of the air-fuel supply system through a pipeline. The air-fuel supply system and the fan system are electrically connected to the output end of the control system respectively. An ignition probe is installed in the burner. The ignition probe includes an ignition needle with a flame stabilization monitoring function and a detection needle with pressure monitoring and gas content monitoring. The ignition needle and the detection needle are both electrically connected to the control system.

[0006] As a preferred technical solution, an ignition needle head with a flame stabilization monitoring function and a connector 1 are respectively provided at both ends of the ignition needle. The ignition needle head is inserted into the burner, and the connector 1 is electrically connected to the control system.

[0007] As a preferred technical solution, both ends of the detection needle are provided with a detection needle head with pressure monitoring and gas content monitoring and a second connector. The detection needle head is inserted into the burner, and the second connector is electrically connected to the control system.

[0008] As a preferred technical solution, the ignition probe preferably includes a ceramic layer and a protective sleeve, the ignition needle and the detection needle are both installed through the ceramic layer, and the ceramic layer is embedded in the protective sleeve.

[0009] As a preferred technical solution, the outer wall of the protective sleeve is provided with concave and convex sections.

[0010] As a preferred technical solution, the protective cover is made of metal material.

[0011] As a preferred technical solution, the air-fuel supply system includes an air supply pipeline and a gas supply pipeline, both of which are connected to the burner, both of which are equipped with valves, an air / fuel ratio valve is installed between the air supply pipeline and the gas supply pipeline, and a solenoid valve is installed on the valve of the gas supply pipeline.

[0012] As a preferred technical solution, the control system includes an intelligent controller and a DCS intelligent central control system. The ignition needle, detection needle and solenoid valve are all electrically connected to the intelligent controller, the input end of the DCS intelligent central control system is electrically connected to the output end of the intelligent controller, and the output end of the DCS intelligent central control system is electrically connected to the fan system.

[0013] As a preferred technical solution, the fan system includes a combustion-supporting fan, an induced draft unit and a cooling fan, and the combustion-supporting fan, the induced draft unit and the cooling fan are all electrically connected to the output end of the DCS intelligent central control system.

[0014] As an optimal technical solution, the cooling fan includes a quench fan and a tail cooling fan, the induced draft unit includes a smoke exhaust fan and a heat extraction fan, and the quench fan, the tail cooling fan, the smoke exhaust fan and the heat extraction fan are all electrically connected to the output end of the DCS intelligent central control system.

[0015] Beneficial Effects

[0016] This system uses a double-needle ignition probe with detection effect, which can intelligently complete ignition and ion flameout protection, monitor the working conditions in the furnace in real time, and intelligently control the air-fuel ratio and fan system by the control system. Without manual assistance, it can achieve the best combustion effect and safety protection effect.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A flow chart of a novel industrial furnace ignition system proposed by the present invention;

[0019] Figure 2 A schematic diagram of an ignition probe for a novel industrial furnace ignition system proposed by the present invention.

[0020] Figure numerals: 1, ignition probe; 2, ceramic layer; 3, protective cover; 4, ignition needle; 41, ignition needle head; 42, connector one; 5, detection needle; 51, detection needle head; 52, connector two. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] Example 1

[0023] refer to Figure 1 to Figure 2 A novel industrial furnace ignition system described in this embodiment includes a burner, an air-fuel supply system, a control system and a fan system. An ignition probe 1 with a monitoring function is installed in the burner. The burner is connected to the output end of the air-fuel supply system through a pipeline. The ignition probe 1 is electrically connected to the control system. The air-fuel supply system and the fan system are electrically connected to the output end of the control system respectively.

[0024] The air-fuel supply system provides air and gas for the burner. The ignition probe 1 has the functions of ignition and detection and is the detection end of the control system. The control system controls the air-fuel supply system and the fan system to perform flameout protection, pressure regulation and other operations based on the information detected by the ignition probe 1 to ensure sufficient combustion and safety in the kiln.

[0025] The ignition probe 1 includes a bent ignition needle 4, a vertical detection needle 5, a ceramic layer 2 and a protective sleeve 3. The ignition needle 4 and the detection needle 5 are both installed in the ceramic layer 2, and the ceramic layer 2 is embedded in the protective sleeve 3. The bent end of the ignition needle 4 is an ignition needle head 41. The ignition needle head 41 with a flame stabilization monitoring function is inserted into the ignition hole. The connector 1 42 at the other end of the ignition needle 4 is electrically connected to the control system. The end of the detection needle 5 close to the ignition needle head 41 is a detection needle head 51 with pressure monitoring and gas content monitoring. The detection needle head 51 is inserted into the burner, and the connector 2 52 at the other end of the detection needle 5 is electrically connected to the control system.

[0026] Compared with the traditional single-needle probe, the double-needle structure not only has the ignition function, but also can perform flame monitoring, pressure monitoring and gas content monitoring. After the copper drum connecting line is connected to the control system, it serves as the monitoring end of the control system.

[0027] Preferably, the protective cover 3 is made of metal material to prevent the needle body from bursting due to gravity impact or high temperature environment, thereby preventing the ceramic from breaking or cracking.

[0028] Preferably, the outer wall of the protective sleeve 3 is provided with concave and convex sections, which improves the strength of the metal protective sleeve 3 and facilitates the positioning and installation of the ignition probe 1.

[0029] The air-fuel supply system includes an air supply pipeline and a gas supply pipeline. Both the air supply pipeline and the gas supply pipeline are connected to the burner. Both the air supply pipeline and the gas supply pipeline are installed with valves. The air supply pipeline and the gas supply pipeline are connected by a pipeline and an air / fuel ratio valve is installed on the connecting pipeline.

[0030] Preferably, the valve of the gas supply pipeline is a solenoid valve.

[0031] The air-fuel supply system is used to provide air and gas to the burner. The gas supply pipeline requires more sophisticated gas control. The use of solenoid valves can facilitate the control system to control the gas intake.

[0032] The control system includes an intelligent controller and a DCS intelligent central control system. Connector 1 42 and connector 2 52 are electrically connected to the input end of the intelligent controller. The input ends of the solenoid valve and the DCS intelligent central control system are electrically connected to the output end of the intelligent controller. The output end of the DCS intelligent central control system is electrically connected to the fan system.

[0033] The intelligent controller may use a PLC controller to receive and analyze the information monitored by the ignition probe 1, and control the solenoid valve and the DCS intelligent central control system according to the analysis result. The DCS intelligent central control system then controls each fan of the fan system respectively.

[0034] The intelligent controller is equipped with a mobile power supply and is electrically connected to a fixed power supply, which facilitates mobility while ensuring uninterrupted power supply.

[0035] The fan system includes a combustion-supporting fan, an induced draft fan unit and a cooling fan, wherein the cooling fan includes a quenching fan and a tail cooling fan, and the induced draft fan unit includes a smoke exhaust fan and a heat extraction fan. The quenching fan, the tail cooling fan, the smoke exhaust fan and the heat extraction fan are all electrically connected to the output end of the DCS intelligent central control system.

[0036] The cold air blown in by the cooling fan exchanges heat with the product, the product is cooled and the cold air is preheated at the same time; the combustion-supporting fan is used to provide combustion-supporting air for the burner inside the kiln to maintain normal combustion of the burner in the furnace. The induced draft unit is used to discharge the flue gas generated by the combustion of the fuel and the hot air generated by the cold air blown in by the cooling fan and the heat flow field in the kiln. The cooling fan is used to reduce the temperature in the kiln to ensure that the product meets the designed roasting process requirements when it leaves the kiln, and to balance the kiln pressure.

[0037] Ignition: The manual valves on the air supply pipeline and the gas supply pipeline are opened, the intelligent controller controls the ignition needle 41 of the ignition needle 4 to ignite, and the intelligent controller outputs a signal to the DCS intelligent central control system to control the combustion-supporting fan to turn on the combustion-supporting fan;

[0038] Monitoring: The ignition needle 41 monitors whether the flame is extinguished, and the detection needle monitors the gas pressure in the burner and the CO, CO2, NOX Equal gas content;

[0039] Ion flameout protection: Due to the photoelectric properties of flames, a large number of ions and electrons will be generated when the flame burns. They are attracted by electrodes with a certain charge and can generate a small current. If there is a current passing through, it means that there is a flame; if the current disappears, it means that the flame is extinguished; so when the ignition needle 41 detects that there is no flame, the connector 42 transmits the collected signal to the intelligent controller, and the intelligent controller outputs a gas source closing signal to the solenoid valve, and the solenoid valve controls the gas to be closed to ensure safety and prevent gas leakage;

[0040] When the detection needle 51 detects that the positive pressure in the kiln is too large, the resistance in the furnace is large, the smoke cannot be discharged smoothly, and part of the heat of the smoke will escape to the outside of the kiln. At this time, the connector 2 52 feeds back the signal to the intelligent controller, and the intelligent controller outputs the signal to the DCS intelligent central control system. The DCS intelligent central control system issues a command to control the combustion fan to reduce the air volume, and increase the air volume of the smoke exhaust fan and the cooling fan to the required value, for example, adjusting the fan frequency from 40Hz to 50Hz;

[0041] When the probe needle 51 detects that the positive pressure in the kiln is too low, it will lead to insufficient air, resulting in incomplete combustion and the generation of large amounts of CO, CO2, NO X The detection needle 51 transmits the collected signal to the intelligent controller, and the intelligent controller outputs the signal to the DCS intelligent central control system to control the combustion-supporting fan, the smoke exhaust fan and the heat extraction fan to increase the air volume;

[0042] When the detection needle 51 detects that the negative pressure in the kiln is too large, too much cold air is sucked in, causing the furnace to cool down, the exhaust fan and the heat extraction fan to have too much suction, and the combustion fan to blow insufficient air. At this time, the air volume of the exhaust fan and the heat extraction fan is reduced, and the air volume of the combustion fan is increased.

[0043] When the detection needle 51 detects that the negative pressure in the kiln is too small, it is because of incomplete combustion, fuel accumulation in the furnace, resulting in poor air flow inside the furnace, thus forming negative pressure. At this time, the air volume of the smoke exhaust fan, heat extraction fan, quenching fan and tail cooling fan needs to be increased at the same time.

[0044] When the detection needle 51 detects O2, CO, CO2, NO X When the content is too high, the collected signal is transmitted to the intelligent controller, and the intelligent controller outputs the signal to the DCS intelligent central control system to control the combustion-supporting fan to automatically increase the air volume to ensure that the fuel is fully mixed with the air and burned in the furnace.

[0045] This system uses a double-needle ignition probe 1 with detection effect, which can intelligently complete ignition and ion flameout protection, monitor the situation in the furnace in real time, and intelligently control the air-fuel ratio and fan system by the control system, without manual assistance, to achieve the best combustion effect and safety protection effect.

[0046] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of industrial kiln ignition system, characterized by: The invention comprises a burner, an air-fuel supply system, a control system and a fan system. The burner is connected to the output end of the air-fuel supply system through a pipeline. The air-fuel supply system and the fan system are electrically connected to the output end of the control system respectively. An ignition probe (1) is installed in the burner. The ignition probe (1) comprises an ignition needle (4) with a flame stabilization monitoring function and a detection needle (5) with pressure monitoring and gas content monitoring functions. The ignition needle (4) and the detection needle (5) are both electrically connected to the control system.

2. The novel industrial furnace ignition system according to claim 1 is characterized in that: An ignition needle head (41) and a connector head (42) having a flame stabilization monitoring function are respectively provided at both ends of the ignition needle (4); the ignition needle head (41) is inserted into the burner, and the connector head (42) is electrically connected to the control system.

3. The novel industrial furnace ignition system according to claim 1 is characterized in that: A detection needle head (51) and a second connector (52) with functions of pressure monitoring and gas content monitoring are respectively provided at two ends of the detection needle (5); the detection needle head (51) is inserted into the burner, and the second connector (52) is electrically connected to the control system.

4. The novel industrial furnace ignition system according to claim 1 is characterized in that: The ignition probe (1) comprises a ceramic layer (2) and a protective sleeve (3); an ignition needle (4) and a detection needle (5) are both installed through the ceramic layer (2); and the ceramic layer (2) is embedded in the protective sleeve (3).

5. The novel industrial furnace ignition system according to claim 4 is characterized in that: The outer wall of the protective sleeve (3) is provided with concave and convex sections.

6. The novel industrial furnace ignition system according to claim 6 is characterized in that: The material of the protective cover (3) is metal material.

7. The novel industrial furnace ignition system according to claim 1 is characterized in that: The air-fuel supply system includes an air supply pipeline and a gas supply pipeline. Both the air supply pipeline and the gas supply pipeline are connected to the burner. Both the air supply pipeline and the gas supply pipeline are installed with valves. An air / fuel ratio valve is installed between the air supply pipeline and the gas supply pipeline. A solenoid valve is installed on the valve of the gas supply pipeline.

8. The novel industrial furnace ignition system according to claim 7 is characterized in that: The control system comprises an intelligent controller and a DCS intelligent central control system; the ignition needle (4), the detection needle (5) and the solenoid valve are all electrically connected to the intelligent controller; the input end of the DCS intelligent central control system is electrically connected to the output end of the intelligent controller; and the output end of the DCS intelligent central control system is electrically connected to the fan system.

9. The novel industrial furnace ignition system according to claim 8 is characterized in that: The fan system includes a combustion-supporting fan, an induced draft unit and a cooling fan, and the combustion-supporting fan, the induced draft unit and the cooling fan are all electrically connected to the output end of the DCS intelligent central control system.

10. The novel industrial furnace ignition system according to claim 9 is characterized in that: The cooling fan includes a quench fan and a tail cooling fan, the induced draft unit includes a smoke exhaust fan and a heat extraction fan, and the quench fan, the tail cooling fan, the smoke exhaust fan and the heat extraction fan are all electrically connected to the output end of the DCS intelligent central control system.

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