Medium-wave flame detector for gas fuel

Abstract

The utility model provides a medium-wave flame detector for gas fuel, which comprises a bearing assembly component, a light filtering and blocking component, a light converging component, a photoelectric conversion component and a signal processing component, adopts a medium-wave sensor with the size of about 3-5 microns to detect flame signals, is stable in performance in a high-temperature, high-humidity or more-dust environment, and can be used for detecting flame signals. The flame detection device is high in adaptability, capable of effectively avoiding interference of background light and improving the accuracy and reliability of flame detection, simple in structure, easy to install and maintain, high in economical efficiency and practicability, particularly suitable for a multi-burner system, capable of remarkably reducing the phenomena of false alarm and missing alarm and capable of improving the flame detection effect.

Description

Technical Field

[0001] This utility model relates to combustion detection equipment, and more particularly to a medium-wave flame detector for gaseous fuels. Background Technology

[0002] Natural gas and other gaseous fuels are mainly composed of methane, hydrogen, and carbon monoxide. The light waves released during combustion are primarily concentrated in the ultraviolet and infrared bands of 200–400 nm. Traditional flame detectors typically use ultraviolet sensors to detect the flame signal of gaseous fuels. However, the ultraviolet band is transparent to the atmosphere in the combustion zone, and background flames easily interfere with the flame detector, leading to widespread "peek-through" phenomena. Especially in multi-burner systems, ultraviolet flame detectors perform poorly, failing to accurately distinguish between background and target flames, resulting in frequent false alarms and missed alarms.

[0003] In existing technologies, ultraviolet (UV) flame detectors are easily affected by background light interference in multi-burner systems, leading to a decrease in detection accuracy. Furthermore, the sensitivity of UV sensors is significantly affected by environmental factors, especially in industrial environments with high temperature, high humidity, or high dust levels, where their performance further degrades. Therefore, there is an urgent need for a flame detection technology that can effectively avoid background light interference and improve detection accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a medium-wave flame detector for gaseous fuels to improve detection accuracy.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A medium-wave flame detector for gaseous fuels, comprising:

[0007] A load-bearing assembly component is installed in the burner system and has an internal assembly space.

[0008] A light filtering component is installed in the supporting assembly component and corresponds to the position of the burner. The light filtering component filters and blocks the light emitted by the burner, allowing light within a predetermined wavelength range to enter the supporting assembly component.

[0009] A light converging component is installed in a supporting assembly component and cooperates with a light filtering component. The light converging component focuses the light that passes through the light filtering component and enters the supporting assembly component.

[0010] The photoelectric conversion component is installed in the bearing assembly component and cooperates with the light converging component, and the photoelectric conversion component performs photoelectric conversion on the light converging by the light converging component to form an electric signal;

[0011] The signal processing component is installed in the bearing assembly component and cooperates with the photoelectric conversion component, and the signal processing component processes the electric signal formed by the photoelectric conversion component to obtain the flame state information of the burner and output externally.

[0012] Specifically, the bearing assembly component comprises:

[0013] The bearing cylinder shell is made of aluminum alloy and is installed in the burner system through the connecting piece, and an assembly space is formed in the bearing cylinder shell.

[0014] The light filtering component comprises:

[0015] The band-pass filter is installed in the bearing assembly component and points to the direction of the burner, and the light transmission bandwidth is 4-4.5 μm, and the light filtering component filters the light emitted by the burner, so that the light with a center wavelength of 4.3 μm passes through the band-pass filter and enters the bearing cylinder shell.

[0016] The light converging component comprises:

[0017] The converging convex lens is installed in the bearing assembly component and located behind the light filtering component, and the converging convex lens is an infrared convex lens, and the converging convex lens converges the light passing through the light filtering component and entering the bearing assembly component.

[0018] The photoelectric conversion component comprises:

[0019] The photoelectric sensor is installed in the bearing assembly component and located behind the light converging component, and the photoelectric sensor is a medium wave photoelectric sensor, and the photoelectric sensor performs photoelectric conversion on the light converging by the light converging component to form an electric signal.

[0020] The signal processing component comprises:

[0021] The signal circuit board is installed in the bearing assembly component and electrically connected to the photoelectric conversion component through a wire, and the signal circuit board processes the electric signal formed by the photoelectric conversion component to obtain the flame state information of the burner and output externally.

[0022] The flame detector utilizes the strong absorption peak of carbon dioxide in combustion products at 4-4.5 mu m, so that the background light containing the wave band is absorbed by the large amount of carbon dioxide gas in the furnace, and shows the non-transparent characteristics. Therefore, the target sensor can only receive the target flame optical signal close to the target, effectively avoiding the interference of the background light, and achieving the purpose of accurately detecting the target flame signal.

[0023] The utility model has the advantages that:

[0024] The flame detector adopts a middle wave sensor of about 3-5 mu m to detect the flame signal, and has stable performance, strong adaptability, and can effectively avoid the interference of the background light in the high-temperature, high-humidity or high-dust environment, improve the accuracy and reliability of the flame detection, has simple structure, is easy to install and maintain, has high economy and practicality, and is especially suitable for the multi-burner system, can significantly reduce the false alarm and missed alarm phenomenon, and improve the effect of the flame detection. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structural schematic diagram of the middle wave flame detector for gaseous fuel. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0027] As Figure 1As shown, the gas fuel mid-wave flame detector provided by the utility model includes a bearing assembly component, a light filtering component, a light converging component, a photoelectric conversion component and a signal processing component, the bearing assembly component is installed in a burner system, has an assembly space inside, the light filtering component is installed in the bearing assembly component and corresponds to the position of the burner, the light filtering component filters and blocks the light emitted by the burner, allows the light in a predetermined wavelength range to enter the bearing assembly component, the light converging component is installed in the bearing assembly component and cooperates with the light filtering component, the light converging component converges and processes the light that has passed through the light filtering component and entered the bearing assembly component, the photoelectric conversion component is installed in the bearing assembly component and cooperates with the light converging component, the photoelectric conversion component performs photoelectric conversion processing on the light that has been converged by the light converging component, forms an electric signal, the signal processing component is installed in the bearing assembly component and cooperates with the photoelectric conversion component, the signal processing component processes the electric signal formed by the photoelectric conversion component, acquires the flame state information of the burner and outputs the information externally.

[0028] In the embodiment, the bearing assembly component includes a bearing cylinder 100, the bearing cylinder 100 is made of aluminum alloy and is installed in the burner system through a connecting piece, and an assembly space is formed inside the bearing cylinder 100.

[0029] The light filtering component includes a band-pass filter 200, the band-pass filter is installed at the front end of the bearing cylinder 100 and points to the direction of the burner, has a light transmission bandwidth of 4-4.5 μm, filters and blocks the light emitted by the burner, allows the light with a center wavelength of 4.3 μm to pass through the band-pass filter 200 and enter the bearing cylinder 100, and the structure and operation principle of the band-pass filter 200 adopt the prior art, so no further description is given.

[0030] The light converging component includes a converging convex lens 300, the converging convex lens 300 is installed in the bearing cylinder and is located behind the band-pass filter, adopts an infrared convex lens, converges and processes the light that has passed through the band-pass filter 100 and entered the bearing cylinder 100. In the embodiment, the converging convex lens 300 is an infrared convex lens and is made of materials such as silicon, germanium and zinc selenide, and the structure and operation principle of the converging convex lens 300 adopt the prior art, so no further description is given.

[0031] The photoelectric conversion component includes a photoelectric sensor 400, the photoelectric sensor 400 is installed in the bearing cylinder 100 and is located behind the converging convex lens 300, adopts a mid-wave photoelectric sensor, performs photoelectric conversion processing on the light that has been converged by the converging convex lens 300, and forms an electric signal. In the embodiment, the photoelectric sensor 400 is a mid-wave infrared sensor, has a relatively high photoelectric conversion efficiency for light waves of 3-5 μm, is stable in operation, has good high-temperature resistance, and the structure and operation principle of the photoelectric sensor 400 adopt the prior art, so no further description is given.

[0032] The signal processing component comprises a signal circuit board 500 mounted in the bearing cylinder shell 100 and electrically connected with the photoelectric sensor 400 through a wire, and the signal circuit board 500 filters and amplifies the electric signal formed by the photoelectric sensor 400, removes noise interference and the like, so as to obtain the flame state information of the burner and output the same to the outside, and the signal is transmitted to the control unit to identify and judge the flame signal. In the embodiment, a DSP processing chip is used in the signal circuit board, an FFT algorithm is used to realize the signal separation of the direct current, alternating current and spectrum of the flame signal respectively, and the existence of the flame signal and the output of the flame intensity analog signal are output through the threshold comparison of the signals, and the structure and operation principle of the signal circuit board are the same as those of the prior art, and thus are not described herein.

[0033] In the description of the utility model, it needs to be explained that when the terms indicating the orientation or position relationship of "up", "down", "inner", "outer", "left", "right" and the like appear, they should be understood as the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the utility model product is used, or the orientation or position relationship commonly understood by the person skilled in the art, and only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as limiting the utility model. In addition, when the terms "first", "second" and the like appear, they are only used for distinguishing the description, and cannot be understood as indicating or implying relative importance. In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, and can be the communication between two elements. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. A medium-wave flame detector for gaseous fuels, characterized in that, include: A load-bearing assembly component is installed in the burner system and has an internal assembly space. A light filtering component is installed in the supporting assembly component and corresponds to the position of the burner. The light filtering component filters and blocks the light emitted by the burner, allowing light within a predetermined wavelength range to enter the supporting assembly component. A light converging component is installed in a supporting assembly component and cooperates with a light filtering component. The light converging component focuses the light that passes through the light filtering component and enters the supporting assembly component. A photoelectric conversion component is installed in a supporting assembly component and cooperates with a light converging component. The photoelectric conversion component performs photoelectric conversion processing on the light converged by the light converging component to form an electrical signal. The signal processing component is installed in the supporting assembly component and cooperates with the photoelectric conversion component. The signal processing component processes the electrical signal generated by the photoelectric conversion component to obtain the flame status information of the burner and output it to the outside.

2. The medium-wave flame detector for gaseous fuels according to claim 1, characterized in that, The load-bearing assembly components include: The support shell is made of aluminum alloy and is installed in the burner system via connectors, forming an assembly space inside.

3. A medium-wave flame detector for gaseous fuels according to claim 1, characterized in that, The light filtering component includes: A bandpass filter is installed in the supporting assembly component and points towards the burner.

4. A medium-wave flame detector for gaseous fuels according to claim 1, characterized in that, The light converging components include: A converging convex lens is mounted in the supporting assembly and located behind the light filtering component.

5. A medium-wave flame detector for gaseous fuels according to claim 1, characterized in that, Photoelectric conversion components include: A photoelectric sensor is mounted in the supporting assembly component and located behind the light converging component.

6. A medium-wave flame detector for gaseous fuels according to claim 1, characterized in that, The signal processing components include: A signal circuit board is mounted in a supporting assembly component and is electrically connected to a photoelectric conversion component via circuitry.

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