CN214666620U - Probe for detecting coking of water-cooled wall in severe environment - Google Patents
Probe for detecting coking of water-cooled wall in severe environment Download PDFInfo
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- CN214666620U CN214666620U CN202120153717.5U CN202120153717U CN214666620U CN 214666620 U CN214666620 U CN 214666620U CN 202120153717 U CN202120153717 U CN 202120153717U CN 214666620 U CN214666620 U CN 214666620U
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Abstract
本实用新型公开了一种用于恶劣环境水冷壁结焦检测的探针：依次布置的激光发生单元、导光臂组件、光路系统和旋转探头，激光器与光路系统之间布置有传感器阵列；激光发生单元产生的激光由导光臂组件引入光路系统经分束为入射光和参考光；入射光抵达旋转探头后变成发散光束，照射到水冷壁上散射形成物光；旋转探头捕获物光后在传感器阵列形成物光光场；参考光经光路系统在传感器阵列处形成参考光光场，发生干涉产生全息干涉；图案信号接收处理单元，采集全息干涉图案，获得被测水冷壁区域结焦位置及厚度信息。本实用新型还公开了采用上述探针用于恶劣环境水冷壁结焦检测的方法。该探针及方法可以实现恶劣环境下水冷壁结焦位置及严重程度的快速准确测量。
The utility model discloses a probe for coking detection of a water-cooled wall in a harsh environment: a laser generating unit, a light guide arm assembly, an optical path system and a rotating probe are arranged in sequence, and a sensor array is arranged between the laser and the optical path system; The laser generated by the unit is introduced into the optical path system by the light guide arm assembly and split into incident light and reference light; the incident light reaches the rotating probe and becomes a diverging beam, which irradiates the water-cooled wall and scatters to form object light; after the rotating probe captures the object light, The sensor array forms the object light field; the reference light passes through the optical path system to form the reference light field at the sensor array, and the interference produces holographic interference; the pattern signal receiving and processing unit collects the holographic interference pattern to obtain the focus position and thickness of the measured water wall area information. The utility model also discloses a method for detecting the coking of a water-cooled wall in a harsh environment by using the above probe. The probe and the method can realize fast and accurate measurement of the coking position and severity of the water wall in harsh environments.
Description
Technical Field
The utility model relates to a diagnostic technique is detected to adverse circumstances water-cooling wall, concretely relates to probe that is used for adverse circumstances water-cooling wall coking to detect.
Background
The coal-fired industrial boiler simultaneously carries out the processes of fuel combustion and heat release, heat transfer of high-temperature flame to peripheral wall surfaces, flow of flue gas along the boiler, deposition of fly ash on the wall and the like. When the fuel is burnt in the furnace, a large amount of heat is released, the combustion products (flue gas) are heated to a high temperature, and the temperature is up to 1500-1600 ℃ in the central area of the flame. The water-cooled walls are arranged on the inner walls of the periphery of the hearth and are continuously arranged close to the furnace walls to serve as evaporation heating surfaces to absorb heat of high-temperature flame in the furnace. Combustion flue gas rises in the hearth, flows along with ash particles, and forms a complex aerodynamic field in combination with combustion disturbance. Therefore, the severe environment of the water wall brings great difficulty to the detection of the water wall.
Coking of a water-cooled wall of a hearth of a coal-fired boiler is one of important problems influencing the combustion process of the boiler, which can destroy the normal combustion working condition, reduce the output of the boiler, destroy the normal water circulation, cause pipe explosion accidents, and cause the blockage of the outlet of the hearth to stop the boiler in serious cases. In order to effectively relieve the coking condition of the boiler, on one hand, the quality and the characteristics of the fire coal can be mastered, medium analysis is well done, the coking characteristic of the raw material is improved, and on the other hand, the coking of the boiler can be slowed down through combustion adjustment optimization, air quantity adjustment, good investment of soot blowing equipment and the like. However, in order to optimize the coking in a targeted manner, the location and extent of coking on the water-cooled walls of the boiler must be known in practice. At present, the coking position can be judged in the boiler only by visual observation through fire observation holes around a water-cooled wall of a hearth, or the coking degree of the boiler can be roughly judged by observing indirect factors such as the temperature of the hearth, the temperature of outlet smoke, the slag distribution and the like. A method and a device capable of accurately judging the coking position and the coking severity of the water-cooled wall of the boiler in the severe environment are lacked.
The holographic imaging technology is an active imaging technology, and can realize three-dimensional imaging of an object in a strong background radiation environment such as flame by actively emitting laser with a specific wavelength lambda as an irradiation light source and selectively collecting signal light with the wavelength lambda by a sensor through optical elements such as an optical filter and the like to realize isolation of background signals.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a probe for adverse circumstances water-cooling wall coking detects can realize the quick accurate measurement of adverse circumstances water-cooling wall coking position and severity.
For solving the technical problem, the utility model provides a following technical scheme:
a probe for harsh environment water wall coking detection, the probe comprising: the device comprises a laser generating unit, a light guide arm assembly, an optical path system and a rotary probe which are sequentially arranged, wherein a sensor array is arranged between a laser and the optical path system;
laser generated by the laser generating unit is introduced into the optical path system by the light guide arm component and split into incident light and reference light;
the incident light reaches the rotary probe, then passes through the optical lens and is changed into divergent beams, and the divergent beams irradiate on the water-cooled wall, and the incident light is scattered by the wall surface of the water-cooled wall to form object light; the object light is captured by the rotary probe and then forms an object light field in the sensor array through the optical path system;
the reference light passes through the optical path system to form a reference light field with the intensity equivalent to that of the object light at the sensor array, and the object light field and the reference light field are interfered to generate a holographic interference pattern;
the probe also comprises a signal receiving and processing unit which is used for collecting the holographic interference pattern and reducing the three-dimensional appearance of the surface of the water-cooling wall through a three-dimensional reconstruction algorithm to obtain the coking position and thickness information of the area of the water-cooling wall to be detected.
The light guide arm assembly is a high-precision light guide arm system with multi-joint rotation and high structural flexibility, the light inlet end is connected with the laser outlet, and the light outlet end is connected with the probe light path system.
The laser generation unit comprises a carbon dioxide laser and a cooler; the carbon dioxide laser generates a mid-infrared wavelength laser beam, beam mass M2The power is less than or equal to 1.2 and can be adjusted within the range of 2W to 100W. The cooler uses water as a cooling working medium and is used for cooling the laser, the refrigerating capacity is 50W-150W, the temperature control precision is +/-1 ℃, and the laser can be ensured to operate at normal temperature.
The optical path system comprises a spectroscope, a laser attenuation sheet, a focusing lens, a narrow-band filter and a light splitting film; laser generated by the laser generating unit is introduced into the optical path system by the light guide arm component and split into incident light and reference light by the beam splitter; the object light is captured by the rotary probe and then forms an object light field in the sensor array through the narrow band filter and the light splitting film; the reference light passes through the laser attenuation sheet, the focusing lens, the narrow-band filter and the light splitting film to form a reference light field with the intensity equivalent to that of the object light at the sensor array.
Preferably, the focusing lens includes a focusing lens 1 and a focusing lens 2 for expanding the beam.
Preferably, the beam splitter has a diameter of 25.4mm, a splitting ratio (transmission: reflection) of 9: 1; the diameter of the focusing lens is 25.4 mm-101.6 mm, and the focal length is 25.4 mm-254 mm; the diameter of the laser attenuation sheet is 25.4mm, and the laser transmittance is 0.01-10%.
The utility model discloses in, rotatory probe be probe tip portion, for guaranteeing signal light transmission precision, adopt the knuckle design of taking the speculum.
The rotary probe bag sequentially comprises a connecting joint, a first bearing, a reflecting mirror 1, a second bearing, a reflecting mirror 2 and a rotary probe closed end, incident light reaches the rotary probe and then is changed into divergent light beams after passing through the reflecting mirror 1 and the reflecting mirror 2, the divergent light beams irradiate on the water-cooled wall, and incident light is scattered on the wall surface of the water-cooled wall to form object light. Preferably, the closed end of the rotary probe is closed by a high-temperature resistant glass window.
Preferably, the diameters of the reflector 1 and the reflector 2 are 25.4 mm-101.6 mm, and the light reflectivity of the wavelength of 10.6 μm is more than 95%;
and the first bearing and the second bearing are provided with electric control driving systems for controlling the axial and circumferential rotation angles of the rotary probe.
The sensor array is an amorphous silicon infrared microbolometer. The resolution of the amorphous silicon infrared microbolometer is 640 multiplied by 480, and the frame rate can reach 50 Hz.
The probe comprises a cooling jacket which is laid around the optical path system and the rotary probe, and a coolant inlet and a coolant outlet of the cooling jacket are arranged close to the light guide arm component.
The cooling jacket is of a double-layer cooling structure, the outer layer is a coolant inlet channel, and the inner layer is a coolant outlet channel.
The probe comprises a hollow shell main body, one end of the hollow shell main body is an open end, the other end of the hollow shell main body is provided with a rotary probe, a light path system is arranged between the open end and the rotary probe, and the laser generation unit and the light guide arm assembly are arranged outside the open end; the cooling jacket is positioned on the inner wall of the hollow shell main body, and the coolant inlet and the coolant outlet are arranged near the opening end.
The utility model provides a use method that is used for probe of adverse circumstances water-cooling wall coking detection, including following step:
(1) inserting a probe into the ignition hole;
(2) the laser generating unit generates a middle infrared wavelength laser beam and generates two beams of laser light after beam splitting by the spectroscope, wherein the two beams of laser light are reference light and incident light respectively;
(3) incident light reaches the rotary probe, becomes a divergent beam after passing through a reflector 1 and a reflector 2 in the rotary probe, and irradiates on the water-cooled wall, and the wall surface of the water-cooled wall scatters the incident light to form object light; the object light is captured by the rotary probe, and an object light field is formed at the sensor array after the object light sequentially passes through the narrow band filter and the light splitting film;
(4) after the reference light passes through the laser attenuation sheet, the focusing lens, the narrow-band filter and the light splitting film, a reference light field with the intensity equivalent to that of the object light is formed at the sensor array, and the reference light and the object light interfere at the sensor array to generate interference fringes;
(5) the signal processing system carries out digital reconstruction on the recorded holographic interference pattern, reduces the three-dimensional appearance of the surface of the water-cooling wall and obtains the coking position and thickness information of the area of the water-cooling wall to be detected;
(6) the angle of the probe is rotated through an electric control driving system to obtain observation view fields with different angles, and the measured coking information of the water cooling walls of a plurality of view fields is subjected to image characteristic matching processing, so that the coking position and thickness condition of the water cooling wall of the whole boiler can be obtained.
In the step (2), the beam splitter divides the mid-infrared laser beam into incident light and reference light, and because the incident light needs to irradiate the inside of the hearth and passes through a long-distance severe environment, the light intensity of the received object meets the requirement, and when the beam splitter splits the light, the light intensity of the incident light is greater than that of the reference light.
In the step (3), the signal receiving unit is arranged at the open end of the probe, namely outside the ignition hole of the boiler, and receives the object light scattered by the measured water-cooled wall from the probe.
In the step (4), the formation process of the holographic fringe pattern comprises the following steps: water wallThe incident light is scattered by the surface to form object light, and an object light field is formed at the sensor array
Wherein O is0(x, y) is the amplitude information of the object light field, phiO(x, y) is phase information (x, y) is rectangular coordinate value with the center of the sensor array as the origin; after the reference light passes through the attenuation sheet and the optical lens, a reference light field with the intensity equivalent to that of the object light is formed at the sensor array
Wherein R is0(x, y) is the amplitude information of the object light field, phiR(x, y) is phase information; because the reference light and the object light are from the same laser source, the two light fields interfere at the sensor array to generate interference fringes under the condition of satisfying coherence
R*(x,y)、O*(x, y) are conjugate of the reference light and object light, respectively, and I (x, y) can be recorded by the sensor array.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses can visit into furnace through the ignition hole and carry out the multi-angle measurement, realize the quick accurate measurement of water-cooling wall coking position and severity under the adverse circumstances, carry out operations such as targeted combustion adjustment optimization, soot blower drop-in for follow-up unit and provide important reference, help slowing down the furnace water-cooling wall coking condition. The utility model can keep the laser and the signal receiving device away from the severe environment of the measuring area through the remote signal transmission, protect the key device and facilitate the engineering application; aiming at the coking measurement of the water-cooled wall at different angles, the penetration of different flame environments can be realized by changing the parameters of the laser and the lens.
The utility model discloses infrared holographic imaging technique in combining has developed an intrusive probe, can realize the measurement of furnace adverse circumstances water-cooling wall coking position and severity, can protect the essential element again and not receive the high temperature damage, is applicable to the engineering scene.
Drawings
FIG. 1 is a schematic diagram of the structure of a probe of the present invention;
FIG. 2 is a diagram of the optical path system of the present invention;
FIG. 3 is a schematic view of the structure of the rotary probe of the present invention;
FIG. 4 is a schematic diagram of the probe of the present invention used for coking imaging of water wall;
wherein: 1. the device comprises a carbon dioxide laser, 2 a cooler, 3 a light guide arm component, 4 an amorphous silicon infrared micro bolometer, 5 a coolant inlet, 6 a coolant outlet, 7 a coolant inlet channel, 8 a coolant outlet channel, 9 an optical path system, 10 a rotary probe, 11 a spectroscope, 12 a laser attenuation sheet, 13 a focusing lens 1, 14 a focusing lens 2, 15 a light splitting film, 16 a narrow-band filter, 17 a connecting joint, 18 a first bearing, 19 an electronic control driver, 20 a reflector, 21 a second bearing, 22 a high-temperature resistant glass window, 23 a lighting hole and 24 bonded gray coke.
Detailed Description
The following describes in detail a specific embodiment of the present invention by way of example with reference to the accompanying drawings.
The utility model discloses a probe for adverse circumstances water-cooling wall coking detects, including carbon dioxide laser 1, cooler 2, leaded light arm subassembly 3, light path system 9 and amorphous silicon infrared microbolometer 4, the high energy laser that the laser produced is introduced light path system 9 by leaded light arm subassembly 3; the device also comprises a hollow shell with an opening end and a rotary probe 10, wherein the main body of the shell is in a long tube shape, and the rotary probe is closed by a high-temperature-resistant glass window 22; the laser 1, the light guide arm component 3 and the amorphous silicon infrared microbolometer 4 are all arranged at the opening end, and a light path system 9 and an electric control driving system are arranged in a cavity between the rotary probe 10 and the opening end of the shell; a cooling jacket is laid on the inner wall of the shell, and a coolant inlet 5 and a coolant outlet 6 are arranged near the opening end.
The optical path system 9 includes a beam splitter 11, a laser attenuation sheet 12, a focusing lens 13, a focusing lens 14, a beam splitting film 15 and a narrow-band filter 16. The rotary probe comprises a connecting joint 17, a first bearing 18, an electric control driver 19, a reflecting mirror 20, a second bearing 21 and a high-temperature-resistant glass window 22.
Example 1:
laser with a wavelength of 10.6 μm emitted by a carbon dioxide laser 1 is introduced into an optical path system 9 by a light guide arm component 3, the laser is divided into two beams of laser by a spectroscope 11, the two beams of laser are respectively penetrating light and reflecting light, and the intensity ratio of the penetrating light to the reflecting light is 9: 1; the penetrating light is accurately transmitted by a reflector 20 (a reflector 1 and a reflector 2) in the rotary probe 10 through a subsequent optical path system of an optical path, the rotary probe 10 irradiates a water cooling wall to be detected, the wall surface of the water cooling wall scatters incident light to form object light, the object light is captured by the rotary probe 10, and an object light field is formed at a sensor array after the object light passes through a narrow-band filter 16 and a light splitting film 15 in sequence; the reflected light enters the light splitting film 15 through the laser attenuation sheet 12, is reflected by the light splitting film 15, and irradiates the amorphous silicon infrared micro bolometer 4 to form reference light, and in the process, the reflected light is expanded through the focusing lens 113 and the focusing lens 214; replacing the laser attenuation sheets 12 with different laser transmittances to enable the light intensities of the object light and the reference light to be approximately equal, and forming an obvious holographic pattern on the amorphous silicon infrared microbolometer 4; storing the holographic pattern, reconstructing the holographic pattern through a three-dimensional reconstruction algorithm such as Fresnel integral reconstruction and the like, and reducing the three-dimensional appearance of the coking surface 24 on the measured water-cooling wall area; the rotation of the first bearing 18 and the second bearing 21 is realized through the electric control driver 19, the orientation angle of the probe is adjusted, and the measurement of the coking conditions of the water cooling walls in different areas is realized.
Instructions for use of the probe:
the coolant is first introduced from the coolant inlet 5, flows from the coolant inlet channel 7 to the coolant outlet channel 9, and finally flows out from the coolant outlet 6 to protect the probe apparatus. The probe is placed in an ignition hole of a boiler burner and is in severe environments such as high temperature of a hearth, and the carbon dioxide laser 1, the cooler 2, the light guide arm component 3 and the amorphous silicon infrared micro bolometer 4 are placed at proper positions according to actual measurement requirements. The middle infrared laser passes through the optical path system 9, the rotary probe 10 irradiates the water-cooled wall area to be detected, the object light formed on the surface of the water-cooled wall or the coking surface 24 after scattering is captured by the probe, the reference light and the signal light transmitted back by the optical path system 9 form a holographic stripe pattern on the amorphous silicon infrared micro-bolometer 4, the output signal is connected to the computer through a data line, and the coking condition of the water-cooled wall to be detected can be obtained through holographic reconstruction. The measurement angle is changed by controlling the rotary probe 10 through electric control drive, and the measurement steps are repeated to obtain the coking condition of the water walls in different areas.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (9)
1. A probe for harsh environment water wall coking detection, said probe comprising: the device comprises a laser generating unit, a light guide arm assembly, an optical path system and a rotary probe which are sequentially arranged, wherein a sensor array is arranged between the laser generating unit and the optical path system;
laser generated by the laser generating unit is introduced into the optical path system by the light guide arm component and split into incident light and reference light;
the incident light reaches the rotary probe, then passes through the optical lens and is changed into divergent beams, and the divergent beams irradiate on the water-cooled wall, and the incident light is scattered by the wall surface of the water-cooled wall to form object light; the object light is captured by the rotary probe and then forms an object light field in the sensor array through the optical path system;
the reference light passes through the optical path system to form a reference light field with the intensity equivalent to that of the object light at the sensor array, and the object light field and the reference light field are interfered to generate a holographic interference pattern;
the probe also comprises a signal receiving and processing unit which is used for collecting the holographic interference pattern and reducing the three-dimensional appearance of the surface of the water-cooling wall through a three-dimensional reconstruction algorithm to obtain the coking position and thickness information of the area of the water-cooling wall to be detected.
2. The probe for detecting coking on a water cooled wall in a severe environment according to claim 1, wherein the laser generating unit comprises a carbon dioxide laser and a cooler; the carbon dioxide laser generates a mid-infrared wavelength laser beam, beam mass M2The power is less than or equal to 1.2 and can be adjusted within the range of 2W to 100W.
3. The probe for detecting coking on the water wall in the severe environment according to claim 1, wherein the optical path system comprises a spectroscope, a laser attenuation sheet, a focusing lens, a narrow-band filter and a light splitting film; laser generated by the laser generating unit is introduced into the optical path system by the light guide arm component and split into incident light and reference light by the beam splitter; the object light is captured by the rotary probe and then forms an object light field in the sensor array through the narrow band filter and the light splitting film; the reference light passes through the laser attenuation sheet, the focusing lens, the narrow-band filter and the light splitting film to form a reference light field with the intensity equivalent to that of the object light at the sensor array.
4. The probe for detecting coking on the water cooled wall in the severe environment according to claim 1, wherein the rotary probe pack sequentially comprises a connecting joint, a first bearing, a reflector 1, a second bearing, a reflector 2 and a closed end of the rotary probe, the incident light reaches the rotary probe and then passes through the reflector 1 and the reflector 2 to become a divergent light beam which irradiates the water cooled wall, and the wall surface of the water cooled wall scatters the incident light to form object light.
5. The probe for detecting coking on the water cooled wall in the severe environment as claimed in claim 4, wherein an electric control driving system is arranged at the first bearing and the second bearing for controlling the axial and circumferential rotation angles of the rotary probe.
6. The probe for harsh environment water wall coking detection of claim 1 wherein said sensor array is an amorphous silicon infrared microbolometer.
7. The probe for hostile environment water wall coking detection according to claim 1 and including a cooling jacket around the optical path system and the rotating probe, said cooling jacket having coolant inlet and outlet ports located adjacent the light guide arm assembly.
8. The probe for detecting coking on a water cooled wall in a severe environment as claimed in claim 7, wherein the cooling jacket has a double-layer cooling structure, the outer layer is a coolant inlet channel, and the inner layer is a coolant outlet channel.
9. The probe for detecting coking on the water cooled wall in the severe environment according to claim 8, wherein the probe comprises a hollow shell main body, one end of the hollow shell main body is an open end, the other end of the hollow shell main body is provided with a rotary probe, a light path system is arranged between the open end and the rotary probe, and the laser generating unit and the light guide arm assembly are arranged outside the open end; the cooling jacket is positioned on the inner wall of the hollow shell main body, and the coolant inlet and the coolant outlet are arranged near the opening end.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729120A (en) * | 2021-01-20 | 2021-04-30 | 浙江大学 | Probe and method for detecting coking of water-cooled wall in severe environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729120A (en) * | 2021-01-20 | 2021-04-30 | 浙江大学 | Probe and method for detecting coking of water-cooled wall in severe environment |
| CN112729120B (en) * | 2021-01-20 | 2024-07-05 | 浙江大学 | Probe and method for detecting coking of water-cooled wall in severe environment |
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