Ignition burner and ignition system thereof

Abstract

This application discloses an ignition burner and its ignition system. The ignition burner includes a shell, a fuel inlet, and an oxidizer inlet. Fuel transported along the fuel channel and oxidizer transported along the oxidizer channel are mixed at the end of the ignition burner to produce a combustible fuel / oxidizer mixture. An ignition electrode is used to ignite the fuel and oxidizer, ejecting an ignition flame to ignite a main burner. This application utilizes the combustion of an oxygen-rich oxidizer mixed with fuel gas to form a flame with better rigidity, longer length, and higher ultraviolet emission intensity, which can effectively resist the adverse effects of on-site environmental factors. The ignition success rate of the ignition burner for the main burner is also significantly improved.

Description

Technical Field

[0001] This application relates to the field of smelting, and specifically to an ignition burner and its ignition system. More specifically, the ignition burner is used to ignite a main burner. Background Technology

[0002] During the production and operation of industrial kilns or combustion devices, the main burner requires periodic ignition. To improve the ignition success rate and safety of the main burner, it needs to be ignited by an ignition burner. Commonly used ignition burners utilize air-assisted combustion to generate the ignition flame.

[0003] Many combustion devices operate in harsh environments, such as those filled with dust and turbulent airflow, or where on-site instrumentation fluctuates. Conventional air-assisted combustion ignition devices are prone to problems such as failure to ignite, unstable flames after ignition, and poor flame rigidity. Flame monitors (such as ultraviolet flame detectors) cannot reliably detect such flames, which may lead to main burner ignition failure.

[0004] Currently, commonly used automatic burner control units on the market, such as the Krom Schroder IFD258-10 from Germany, can control and monitor burner operation. Ignition timing can be set in the automatic burner control unit. Sometimes, if the main burner interrupts combustion, it doesn't always need to continue igniting to maintain stable combustion. This is because there may be a large amount of carbon monoxide in the environment, and continued ignition could produce a loud popping sound. Especially when the ultraviolet flame detector cannot detect the flame, such as when the gas supply stops or malfunctions, the automatic burner control unit must shut off all valve assemblies. Therefore, having a sufficiently stable flame that can be detected by the flame detector is also a very important characteristic of ignition burners. Utility Model Content

[0005] The general objective of this disclosure is to provide an ignition burner. This application attempts to address the shortcomings of air-assisted combustion ignition devices, such as poor flame rigidity, short flame length, insufficient ultraviolet emission intensity, and susceptibility to environmental factors, leading to ignition failure of the main burner. This application utilizes the mixing and combustion of an oxygen-enriched oxidizer with the fuel gas to form a flame with better rigidity, longer length, and higher ultraviolet emission intensity, effectively resisting the adverse effects of on-site environmental factors. The ignition burner also significantly improves the ignition success rate of the main burner.

[0006] A first aspect of this application provides an ignition burner, the ignition burner comprising:

[0007] A housing that defines an oxidant passage and a fuel passage;

[0008] The fuel inlet is used to supply fuel to the fuel passage, and the fuel flows out through the fuel outlet.

[0009] An oxidant inlet is used to supply oxidant to the oxidant channel, and the oxidant flows out through the oxidant outlet; the fuel transported along the fuel channel mixes with the oxidant transported along the oxidant channel at the end of the ignition burner to produce a combustible fuel / oxidant mixture;

[0010] The ignition electrode is used to ignite the fuel and oxidizer, and sprays out an ignition flame to ignite a main burner;

[0011] The oxidant is an oxygen-rich oxidant.

[0012] Furthermore, an annular oxidizer channel is formed between the shell and the fuel channel, which are arranged in a concentric manner.

[0013] Furthermore, a support is provided within the fuel passage to isolate the ignition electrode from the fuel passage.

[0014] Furthermore, the support includes a support ring and / or a support sleeve.

[0015] Furthermore, the ignition electrode has an elongated shape and extends through the housing; preferably, the ignition electrode extends through the fuel passage.

[0016] Furthermore, the oxidizer passages are arranged coaxially and surround the fuel passages.

[0017] Furthermore, the oxygen molar concentration of the oxygen-enriched oxidant is at least 90%.

[0018] The second aspect of this application provides an ignition system for controlling an ignition burner as described in the first aspect. The ignition system includes a flame signal detection device, a valve unit, a fuel flow meter, an oxidant flow meter, and a control unit, wherein the fuel flow meter and the oxidant flow meter respectively regulate the flow rates of fuel and oxidant and supply them to the ignition burner.

[0019] The valve unit comprises a valve assembly designed to be connected to a fuel flow meter and an oxidant flow meter;

[0020] The control unit is capable of communicating with the ignition electrode in the ignition burner, the flame signal detection device, the valve unit, the fuel flow meter, and the oxidant flow meter.

[0021] Furthermore, the valve unit is connected to the control unit, which can adjust the opening degree of the valve unit based on the status of the ignition burner and according to a predetermined command.

[0022] A third aspect of this application provides a method for controlling an ignition burner according to the ignition system described in the second aspect, the method comprising the steps of:

[0023] (1) Receive a signal confirming that the fuel flow meter and the oxidant flow meter have been turned on;

[0024] (2) Open the valve group in the valve unit to supply fuel and oxidant to the ignition burner;

[0025] (3) Activate the ignition electrode to form an initial flame;

[0026] (4) The flame signal detection device detects the initial flame. At this time, the ignition electrode continues to ignite to form an ignition flame. When the flame signal in the ignition burner is continuously detected, the ignition electrode is turned off.

[0027] Compared with the prior art, the technical solution provided in this application has the following advantages:

[0028] 1. The combustion aid in the ignition burner uses an oxygen-rich oxidant instead of traditional air, making it easier to ignite in complex on-site environments.

[0029] 2. The ultraviolet intensity of the flame from the ignition burner is increased, making it easier to be detected by an ultraviolet detector.

[0030] 3. The rigidity of the flame in the ignition burner is improved, making it less susceptible to changes in flame shape due to environmental and other factors.

[0031] 4. The flame of the ignition burner is longer, allowing it to be placed further away from the main burner. Attached Figure Description

[0032] The advantages and spirit of this application can be further understood through the following detailed description and accompanying drawings. Figure 1 This is a schematic diagram of the ignition burner in an embodiment of this application.

[0033] In the picture:

[0034] 01 is a high-voltage ignition cap.

[0035] 02 is the electrode core connector.

[0036] 03 is the fuel passage.

[0037] 04 is the oxidant channel.

[0038] 05 is a support component.

[0039] 06 is the fixing bolt.

[0040] 07 is the ignition electrode.

[0041] 08 is the fuel inlet.

[0042] 09 is the oxidant inlet. Detailed Implementation

[0043] The specific embodiments of this application are described in detail below with reference to the accompanying drawings. However, this application should be understood as not being limited to the embodiments described below, and the technical concept of this application can be implemented in combination with other known technologies or other technologies with the same function as those known technologies.

[0044] Terminology Explanation

[0045] In the following description of specific embodiments, in order to clearly illustrate the structure and working method, a number of directional terms will be used for description. However, terms such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "axial", and "radial" should be understood as convenient terms and not as limiting terms.

[0046] In the following description of specific embodiments, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They 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, and therefore should not be construed as limiting this application. Furthermore, when the first structure is described as being positioned "above" or "below" the second structure, this should be understood to mean that the first structure is positioned further away from or closer to the horizontal plane.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not refer to a limitation on time sequence, quantity, or importance. They should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated, but are merely used to distinguish one technical feature from another in this technical solution. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. Similarly, qualifiers such as "a" appearing herein do not refer to a limitation on quantity, but describe technical features not mentioned above. Likewise, unless a noun is modified by a specific quantifier, it should be considered herein to include both singular and plural forms; the technical solution may include either a singular or plural number of that technical feature. Similarly, modifiers such as "approximately" or "approximately" appearing before numerals generally include the number itself, and their specific meaning should be understood in conjunction with the context.

[0048] It should be understood that in this application, "at least one (item)" means one or more, and "more than one" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0049] However, the methods disclosed herein, or other methods shown and / or described herein, may be shown and / or described as a series of actions or events. It should be understood that the order in which these actions or events are shown should not be interpreted in a limiting sense. For example, some actions may be performed in a different order and / or simultaneously with the actions or events shown and / or described herein. Furthermore, not all shown actions are required to implement one or more aspects or embodiments of this disclosure, and one or more actions of this disclosure may be performed as one or more separate actions and / or stages.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. "Fixed connection," "fixed connection," or "non-moving connection" is understood to refer to a connection between two or more structural members that is not constructed to provide relative movement. An embodiment of a fixed connection is a welded connection or a bolted connection, and in some cases, a weld and bolted connection. "Moving connection," "active," or "sliding connection" is understood to refer to a connection between two or more structural members that allows horizontal and / or vertical relative movement between the members under extreme dynamic loads. Such connections typically do not allow movement under static loads or general dynamic loads (e.g., those imposed by light / moderate wind forces).

[0051] The terms “unit,” “item,” “object,” and “module” described in this specification refer to a unit for performing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

[0052] The terms "high pressure" and "medium pressure" mean that high pressure is higher than medium pressure, so the difference between the two may be relatively small.

[0053] The terms "high temperature" and "low temperature" mean that high temperature is higher than low temperature, so the difference between the two may be relatively small.

[0054] As used herein, the term "fuel" refers to gaseous, liquid, or solid fuels that can be used interchangeably or in combination. If it is at least partially in gaseous form, it can be introduced directly into the burner. If it is in liquid or solid form, it is introduced near the burner. Gaseous fuels can be natural gas (primarily methane), propane, hydrogen, syngas, biomass gas, or any other hydrocarbon compound and / or sulfur-containing and / or nitrogen-containing compound. Solid or liquid fuels can be any compound that is primarily carbon-containing and / or hydrocarbon-containing and / or sulfur-containing. The method of introducing gaseous, liquid, or solid fuels can be determined by those skilled in the art as needed, and this application is not intended to impose any limitations.

[0055] As used herein, the terms “oxygen-enriched oxidant” and “combustion accelerant” refer to an oxidizing medium, such as air, oxygen-enriched air, or pure oxygen. The oxygen molar concentration of an oxygen-enriched oxidant can be at least 30%, at least 50%, at least 70%, at least 80%, at least 90%, at least 95%, or at least 99%. These oxygen-enriched oxidants are produced, for example, using cryogenic air separation equipment, or through vacuum pressure swing adsorption processes, or from any other source.

[0056] Specific embodiments of this application are described in detail below with reference to the accompanying drawings. Embodiments are present throughout multiple views of the drawings. The same reference numerals in the embodiments generally denote the same or corresponding elements. Therefore, the description of the embodiments is incorporated herein by reference, and descriptions of common subject matter across embodiments are generally not repeated herein.

[0057] Unless otherwise clearly indicated, each aspect or embodiment defined herein may be combined with any other aspect or embodiment. In particular, any feature indicated as preferred or advantageous may be combined with any other feature indicated as preferred or advantageous.

[0058] like Figure 1As shown, the pilot burner ignites the main burner, and the ignition gun is adapted to provide initial ignition. The pilot burner includes:

[0059] A housing that defines an oxidant channel 04 and a fuel channel 03, with a gap formed between the oxidant channel 04 and the fuel channel 03;

[0060] Fuel inlet 08 is used to supply fuel to fuel channel 03, and the fuel flows out through fuel outlet;

[0061] Oxidant inlet 09 supplies oxidant to oxidant channel 04, and the oxidant flows out through oxidant outlet; fuel transported along fuel channel 03 and oxidant transported along oxidant channel 04 mix at the end of the ignition burner to produce a combustible fuel / oxidant mixture.

[0062] Ignition electrode 07, having an elongated shape and extending through the housing, is used to ignite fuel and oxidizer, ejecting an ignition flame to ignite the main burner (until the main flame of the main burner can be naturally sustained).

[0063] Oxidant passage 04 and fuel passage 03 are coaxially disposed inside the housing. The entire housing of the ignition burner has a hollow tubular shape extending from the inlet end to the outlet end of the ignition burner. The inlet end of the ignition burner includes a fuel inlet 08 for supplying fuel and an oxidant inlet 09 for supplying oxidant.

[0064] Furthermore, an annular oxidizer channel 04 is formed between the shell and the fuel channel 03, which are arranged in a concentric manner.

[0065] The fuel and oxidant form an ignition flame after being ignited by the ignition electrode 07.

[0066] Furthermore, the ignition flame can burn within a ring-shaped area.

[0067] Furthermore, the oxidizer channel 04 and the fuel channel 03 extend axially.

[0068] Furthermore, the oxidizer channel 04 is arranged coaxially and surrounds the fuel channel 03.

[0069] Furthermore, the oxidizer outlet is arranged to surround the fuel outlet, releasing fuel and oxidizer at a parallel angle.

[0070] This ignition burner can be used with any type of main burner unit, and all such types can be used alone or in combination.

[0071] The ignition function of the burner is achieved by the ignition electrode 07. One end of the electrode core is fixed to the electrode core connector 02. The electrode core is used to receive external voltage. When the voltage is conducted through the high-voltage ignition cap 01 to the vicinity of the electrode core end, a spark or arc is generated in that area. Specifically, the electrode core end can be defined as any section near the end of the burner. The arc generated at the electrode core end originates from the potential difference between it and the adjacent metal surface, such as when the end voltage is increased relative to the housing or ground potential. Exemplarily, the discharge location is between the fixing bolt 06 at the end and the inner wall of the oxidant channel 04.

[0072] Therefore, taking the oxidizer channel 04 surrounding the fuel channel 03 as an example, an additional support 05 is provided between the ignition electrode 07 and the fuel channel 03 to isolate the ignition electrode 07 from the fuel channel 03. Multiple supports 05 can be arranged at specified intervals as needed to provide stable support for the ignition electrode 07. The multiple supports can have varying lengths and be provided in multiple segments. The support 05 includes a support ring and / or a support sleeve, thereby firmly encasing the ignition electrode 07 within the fuel channel 03, preventing it from wobbling. The support 05 is made of an insulating material (e.g., ceramic) to ensure that the spark during ignition is generated only at the end of the ignition burner and not in other parts of the burner. The spark generated at the end of the ignition electrode 07 can continuously oscillate around until the fuel and oxidizer mixture is successfully ignited.

[0073] The oxidant used is an oxygen-rich oxidant, which makes combustion more complete and stable by using full oxygen combustion.

[0074] As a preferred example, the distance between the end of the ignition electrode 07 and the outlet of the ignition burner can be increased; otherwise, the ignition electrode is easily burned out.

[0075] When this ignition burner is used to ignite the main burner, the timing is controlled so that the fuel flows out of the end of the ignition burner first, followed by the oxidizer. This avoids violent popping sounds and improves safety. It also lengthens the flame, making it easier for flame signal detection devices to monitor.

[0076] In addition, this application also discloses an ignition control system for the above-mentioned ignition burner, the control system including a flame signal detection device, a valve unit, a fuel flow meter, an oxidant flow meter and a control unit, wherein the fuel flow meter and the oxidant flow meter respectively regulate the flow rates of fuel and oxidant and supply them to the ignition burner;

[0077] The valve unit is designed to be connected to a fuel flow meter and an oxidant flow meter;

[0078] The control unit can communicate with the ignition electrode, flame signal detection device, valve unit, fuel flow meter and oxidant flow meter in the ignition burner.

[0079] Furthermore, the valve unit includes an oxidizer valve assembly and a fuel valve assembly.

[0080] Furthermore, the oxidant valve assembly includes an oxidant pressure regulating valve and an oxidant solenoid shut-off valve.

[0081] Furthermore, the fuel valve assembly includes a fuel pressure regulating valve and a fuel solenoid shut-off valve.

[0082] Furthermore, the valve unit is connected to the control unit, which can adjust the valve opening based on the status of the ignition burner and according to predetermined commands.

[0083] For example, the valve unit can be manually controlled, causing the ratio of fuel and oxidizer supplied to the ignition burner to change.

[0084] Furthermore, the flame signal detection device is an ultraviolet flame detector. This ultraviolet flame detector can continuously monitor the presence and size of the flame at the end of the ignition burner and transmit such signals to the control unit.

[0085] Furthermore, the valve unit can control the flow of fuel and / or oxidizer supplied to the ignition burner.

[0086] Furthermore, the oxidant pressure regulating valve adjusts the oxidant pressure supplied to the oxidant outlet, and the fuel pressure regulating valve adjusts the fuel pressure supplied to the fuel outlet, thereby adjusting the mixing ratio of oxidant and fuel. It also enables gas cutoff after ignition or in emergency situations.

[0087] In addition, a method for controlling an ignition burner according to the above system is also disclosed, including the following steps:

[0088] (1) Receive a signal confirming that the fuel flow meter and oxidant flow meter have been turned on;

[0089] (2) Open the valve group in the valve unit to supply fuel and oxidant to the ignition burner;

[0090] (3) Activate the ignition electrode to form an initial flame;

[0091] (4) The flame signal detection device detects the initial flame. At this time, the ignition electrode continues to ignite to form an ignition flame. When the flame signal in the ignition burner is continuously detected, the ignition electrode is turned off.

[0092] Further, step (1) includes step (1-1): First, the flame signal detection device does not detect a flame signal.

[0093] Furthermore, the initial flame is shorter than the ignition flame.

[0094] Reference Appendix Figure 1 In the above embodiments, fuel channel 03 has an outer diameter of approximately 16 mm and a wall thickness of 1 mm. Oxidant channel 04 has an outer diameter of approximately 24 mm and a wall thickness of 2 mm. During operation, fuel and oxidant are pre-mixed at the outlet to produce an ignitable oxidant / fuel mixture. Exemplarily, the fuel pressure is at least 0.2 bar. The oxidant pressure is at least 0.5 bar.

[0095] The aforementioned ignition burner has been successfully tested with fuel at a pressure of 1.0 bar and oxidizer at a pressure of 2.0 bar. The ignition burner stably ignited the main burner, and the flame signal detection device detected a continuous flame signal. The maximum flame length of the ignition burner in this embodiment was measured to be 570 mm.

[0096] Comparative example:

[0097] Air was used instead of oxygen-enriched oxidizer as the combustion aid in the ignition burner. The outer diameter of the ignition burner in this comparative example was set to 18 mm, and tests were conducted using fuel at 0.15 bar pressure and air at 0.2 bar pressure. The maximum flame length of the air-ignition burner in this comparative example was measured to be 127.5 mm. Because the flow rate / pressure cannot be set too high when air is used as a combustion aid, otherwise the resulting flame will detach from the base of the ignition burner. This is a limitation of air-assisted ignition.

[0098] The embodiments described in this specification are merely preferred embodiments of this application. These embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of this application. Any technical solutions that can be obtained by those skilled in the art based on the concept of this application through logical analysis, reasoning, or limited experimentation should be within the scope of this application.

Claims

1. A pilot burner characterized by, The ignition burner includes: A housing that defines an oxidant passage and a fuel passage; The fuel inlet is used to supply fuel to the fuel passage, and the fuel flows out through the fuel outlet. An oxidant inlet is used to supply oxidant to the oxidant channel, and the oxidant flows out through the oxidant outlet; the fuel transported along the fuel channel mixes with the oxidant transported along the oxidant channel at the end of the ignition burner to produce a combustible fuel / oxidant mixture; The ignition electrode is used to ignite the fuel and oxidizer, and sprays out an ignition flame to ignite a main burner; The oxidant is an oxygen-rich oxidant.

2. The pilot burner of claim 1, wherein An annular oxidizer channel is formed between the shell and the fuel passage, which are arranged in a concentric manner.

3. The pilot burner according to claim 1 or 2, characterized in that A support structure is provided within the fuel passage to isolate the ignition electrode from the fuel passage.

4. The pilot burner of claim 3, wherein The support components include support rings and / or support sleeves.

5. The ignition burner according to claim 1 or 2, characterized in that, The ignition electrode has an elongated shape and extends through the housing.

6. The pilot burner of claim 1 or 2, wherein The oxidizer passages are arranged coaxially and surround the fuel passages.

7. The pilot burner of claim 1 or 2, wherein The oxygen molar concentration of the oxygen-enriched oxidant is at least 90%.

8. Ignition system for controlling an ignition burner as claimed in any one of the claims 1 to 7, characterized in that The ignition system includes a flame signal detection device, a valve unit, a fuel flow meter, an oxidant flow meter, and a control unit, wherein the fuel flow meter and the oxidant flow meter respectively regulate the flow of fuel and oxidant and supply them to the ignition burner; The valve unit includes a valve assembly and is designed to connect to a fuel flow meter and an oxidizer flow meter; the control unit is capable of communicating with the ignition electrode in the ignition burner, the flame signal detection device, the valve unit, the fuel flow meter, and the oxidizer flow meter.

9. The ignition system of claim 8, wherein, The valve unit is connected to the control unit, which can adjust the opening degree of the valve unit based on the status of the ignition burner and according to a predetermined command.

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