CN113534122A - Method for acquiring slag bonding state of boiler water-cooled wall - Google Patents

Method for acquiring slag bonding state of boiler water-cooled wall Download PDF

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Publication number
CN113534122A
CN113534122A CN202110915762.4A CN202110915762A CN113534122A CN 113534122 A CN113534122 A CN 113534122A CN 202110915762 A CN202110915762 A CN 202110915762A CN 113534122 A CN113534122 A CN 113534122A
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China
Prior art keywords
water
millimeter wave
wave radar
boiler
wall
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CN202110915762.4A
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Chinese (zh)
Inventor
方顺利
姚伟
刘家利
李仁义
张森
周广钦
贾子秀
杨忠灿
郝振彪
张喜来
王志超
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Priority to CN202110915762.4A priority Critical patent/CN113534122A/en
Priority to PCT/CN2021/122706 priority patent/WO2023015703A1/en
Publication of CN113534122A publication Critical patent/CN113534122A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/04—Systems determining presence of a target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/04—Systems determining the presence of a target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention discloses a method for acquiring the slagging state of a water-cooled wall of a boiler, which judges whether slagging occurs at each part of the water-cooled wall and the thickness of a slagging layer by accurately measuring the distance from each part of the water-cooled wall and comparing the distance with the distance without slagging. The invention is realized by adopting the following technical scheme: (1) and (4) forming holes in the water-cooled wall of the boiler and installing a millimeter wave radar. (2) And (3) the millimeter wave radar measures the distance to the direction of the water wall on the other side of the boiler and the included angle between the measuring direction and the horizontal direction, whether the current measuring point is slagging is judged, the thickness of a slag layer is adjusted, and the included angle between the measuring direction of the millimeter wave radar and the horizontal direction and the included angle between the measuring direction of the millimeter wave radar and the vertical direction are adjusted until the measurement of the distance of the millimeter wave radar to the direction of the water wall in the left-right range and the up-down range is completed. In the above steps, the measuring direction of the millimeter wave radar can swing up and down, left and right, so as to obtain the distances of different measuring angles. The invention has the advantages of low cost, quick measurement, high measurement accuracy and the like.

Description

Method for acquiring slag bonding state of boiler water-cooled wall
Technical Field
The invention belongs to the technical field of pulverized coal boiler combustion, and particularly relates to a method for acquiring a slagging state of a boiler water-cooled wall.
Background
The general phenomenon of the slagging boiler of the water wall of the boiler during operation influences the heat transfer of the heating surface of the water wall of the boiler, even causes accidents such as smoke, overtemperature of the tube wall, fire extinguishment and the like of the boiler in serious cases, and is very unfavorable for the safety and economy of the operation of the boiler, so that the slagging state of the heating surface of the water wall needs to be mastered in time during the operation of the boiler, and measures such as soot blowing and the like need to be taken in time.
At present, the slagging phenomenon of the water-cooled wall is usually observed through the observation hole of the water-cooled wall, but the method has a visual field blind area, the flame in the furnace is too bright, the slagging phenomenon of the water-cooled wall is difficult to see by naked eyes, and the thickness of a slagging layer cannot be seen.
Disclosure of Invention
The invention aims to provide a method for acquiring the slagging state of a water-cooled wall of a boiler, which judges whether slagging occurs at each part of the water-cooled wall and the thickness of a slagging layer by accurately measuring the distance from the water-cooled wall to each part and comparing the distance with the distance without slagging. The invention has the advantages of low cost, quick measurement, high measurement accuracy and the like.
The invention is realized by adopting the following technical scheme:
a method for acquiring the slagging state of a water-cooled wall of a boiler comprises the following steps:
(1) a hole is formed in a water-cooled wall of the boiler, and a millimeter wave radar is installed;
(2) the distance from the millimeter wave radar to the water wall on the other side of the boiler in the horizontal direction is measured and recorded as d, the included angle between the measurement direction and the horizontal direction is measured and recorded as alpha, when the boiler water wall is not slagging, the distance from the millimeter wave radar to the water wall on the other side in the horizontal direction is measured and recorded as d when alpha is 0 DEG0；
(3) When in use
Figure BDA0003205473520000021
The horizontal position of the millimeter-wave radar is d0The water wall at the tan α position is free of slagging; when in use
Figure BDA0003205473520000022
The horizontal position of the millimeter-wave range radar is
Figure BDA0003205473520000023
Figure BDA0003205473520000024
The water-cooled wall has slag bonding with the thickness of the slag bonding layer being
Figure BDA0003205473520000025
(4) And adjusting the included angle between the measuring direction of the millimeter wave radar and the horizontal direction and the included angle between the measuring direction of the millimeter wave radar and the vertical direction until the distance between the millimeter wave radar and the water wall is measured in the left-right range and the up-down range.
The invention has the further improvement that the measuring direction of the millimeter wave radar can swing up and down, left and right, thereby obtaining the distances of different measuring angles.
The invention has the further improvement that the installation position of the millimeter wave radar is arranged outside the opening of the water wall so as to avoid the millimeter wave radar from being damaged by high temperature in the furnace.
A further development of the invention is that the millimeter wave radar mounting region is above the burner region and below the base of the screen superheater.
The invention is further improved in that a plurality of millimeter wave radars are installed in the millimeter wave radar installation area.
The invention is further improved in that each area of the water wall can be detected by at least one millimeter wave radar to detect the slagging state.
The invention has the further improvement that when the same area of the water-cooled wall is detected by a plurality of millimeter wave radars, the thickness of the slag at the position is the average value of the thicknesses of the slag layers detected by the plurality of millimeter wave radars.
A further improvement of the invention is that the millimeter wave radar can be replaced by a laser radar.
The invention has at least the following beneficial technical effects:
in the invention, only a millimeter wave radar or a laser radar device needs to be installed in the hole of the water wall area, and no device is in contact with the high temperature in the furnace. The relative change of the measurement distance is used for judging whether the boiler water wall is slagging or not, so that the measurement speed is extremely high. Because no quick-wear parts and no consumable materials are arranged in the measuring process, the measuring cost is extremely low each time.
Compared with the existing method for preventing the convection heating surface of the pulverized coal boiler from being stained and slagging, the method has the advantages of low new construction or modification cost, low test cost, short test time period and high test accuracy.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic diagram of the measuring range of the millimeter wave radar.
FIG. 3 is a schematic diagram of a plurality of millimeter wave radars arranged along the periphery of a furnace chamber.
Description of reference numerals:
1-a burner; 2-furnace bottom; 3-millimeter wave radar; 4, adhering slag blocks on the water-cooled wall; 5-platen superheater; 6-hearth; 7-burner region; and 8, furnace wall.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in FIGS. 1-3, the method for obtaining the slag bonding state of the water-cooled wall of the boiler provided by the invention comprises the following steps:
(1) and (4) forming holes in the water-cooled wall of the boiler and installing a millimeter wave radar.
(2) And d is recorded as the distance from the millimeter wave radar to the water wall on the other side of the boiler, and alpha is recorded as the included angle between the measuring direction and the horizontal direction. When the boiler water wall is not slagging, when alpha is measured to be 0 degrees, namely the distance between the millimeter wave radar and the other side water wall in the horizontal direction is recorded as d0。
(3) When in use
Figure BDA0003205473520000041
The horizontal position of the millimeter-wave radar is d0The water wall at the tan α position is free of slagging; when in use
Figure BDA0003205473520000042
The horizontal position of the millimeter-wave range radar is
Figure BDA0003205473520000043
Figure BDA0003205473520000044
The water-cooled wall has slag bonding with the thickness of the slag bonding layer being
Figure BDA0003205473520000045
(4) And adjusting the included angle between the measuring direction of the millimeter wave radar and the horizontal direction and the included angle between the measuring direction of the millimeter wave radar and the vertical direction until the distance between the millimeter wave radar and the water wall is measured in the left-right range and the up-down range.
The measuring direction of the millimeter wave radar can swing up and down, left and right, so that the distances of different measuring angles can be obtained.
Examples
A water-cooled wall of a region above a burner region and below a screen superheater of a certain power plant is provided with holes, and each furnace wall is uniformly provided with 4 millimeter wave radars, and 16 millimeter wave radars in total. These 16 radars acquire measurements of different angular distances from top to bottom and from left to right in each time period.
In the measurement of a certain direction, the radar testing direction is declined by 30 degrees, namely alpha is 30 degrees, the distance measured by the radar is d is 11300mm, and the distance measured by the radar in the horizontal direction is d0＝10000mm。
Due to the fact that
Figure BDA0003205473520000046
Therefore, there is slag formation at the position where the horizontal height from the radar wave is
Figure BDA0003205473520000047
Figure BDA0003205473520000048
Figure BDA0003205473520000049
Similarly, the other 15 radars, two radars and the point are positioned on the same furnace wall, the slagging state of the point cannot be tested, and the thickness of the slag layer of the point measured by the other 13 radars is respectively as follows: 215mm, 209mm, 201mm, 220mm, 207mm, 215mm, 214mm, 219mm, 220mm, 224mm, 209mm, 206mm, 216mm, so that the slag layer thickness at this point is 213 mm.
These 16 radars acquire measurements of different angular distances from top to bottom and from left to right in each time period. The slagging state of all water wall areas above the boiler burner and below the screen superheater is finished, and a position 12000mm away from the bottom of the screen is found to have an area of about 1m2The area (2) is slagging, and the maximum slag layer thickness is about 330 mm.
Compared with the existing method for preventing the convection heating surface of the pulverized coal boiler from being stained and slagging, the method has the advantages of low new construction or modification cost, low test cost, short test time period and high test accuracy.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (8)

1. A method for acquiring the slagging state of a water-cooled wall of a boiler is characterized by comprising the following steps:
(1) a hole is formed in a water-cooled wall of the boiler, and a millimeter wave radar is installed;
(2) the distance from the millimeter wave radar to the water wall on the other side of the boiler in the horizontal direction is measured and recorded as d, the included angle between the measurement direction and the horizontal direction is measured and recorded as alpha, when the boiler water wall is not slagging, the distance from the millimeter wave radar to the water wall on the other side in the horizontal direction is measured and recorded as d when alpha is 0 DEG0；
(3) When in use
Figure FDA0003205473510000011
The horizontal position of the millimeter-wave radar is d0The water wall at the tan α position is free of slagging; when in use
Figure FDA0003205473510000012
The horizontal position of the millimeter-wave range radar is
Figure FDA0003205473510000013
Figure FDA0003205473510000014
The water-cooled wall has slag bonding with the thickness of the slag bonding layer being
Figure FDA0003205473510000015
(4) And adjusting the included angle between the measuring direction of the millimeter wave radar and the horizontal direction and the included angle between the measuring direction of the millimeter wave radar and the vertical direction until the distance between the millimeter wave radar and the water wall is measured in the left-right range and the up-down range.
2. The method for acquiring the slag bonding state of the water cooled wall of the boiler as claimed in claim 1, wherein the measuring direction of the millimeter wave radar can swing up and down, left and right, so as to acquire the distances of different measuring angles.
3. The method for obtaining the slagging state of the water-cooled wall of the boiler according to claim 1, wherein the millimeter wave radar is installed outside the opening of the water-cooled wall so as to avoid the millimeter wave radar from being damaged by high temperature in the boiler.
4. The method for obtaining the slagging state of the water wall of the boiler according to claim 3, wherein the millimeter wave radar is installed above the burner region and below the bottom of the screen superheater.
5. The method for acquiring the slag bonding state of the water cooled wall of the boiler as claimed in claim 4, wherein a plurality of millimeter wave radars are installed in the installation area of the millimeter wave radars.
6. The method for acquiring the slagging state of the water wall of the boiler according to claim 5, wherein each area of the water wall can be detected by at least one millimeter wave radar.
7. The method for acquiring the slagging state of the water cooled wall of the boiler as claimed in claim 5, wherein when the same area of the water cooled wall is detected by a plurality of millimeter wave radars, the slagging thickness at the position is the average value of the slagging thicknesses detected by the plurality of millimeter wave radars.
8. The method for acquiring the slag bonding state of the water cooled wall of the boiler as claimed in claim 1, wherein the millimeter wave radar can be replaced by a laser radar.
CN202110915762.4A 2021-08-10 2021-08-10 Method for acquiring slag bonding state of boiler water-cooled wall Pending CN113534122A (en)

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CN202110915762.4A CN113534122A (en) 2021-08-10 2021-08-10 Method for acquiring slag bonding state of boiler water-cooled wall
PCT/CN2021/122706 WO2023015703A1 (en) 2021-08-10 2021-10-08 Method for obtaining slagging state of water-cooled wall of boiler

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252334A (en) * 2011-03-09 2011-11-23 严晓勇 Intelligent soot blowing method based on laser ranging principle
US9709384B2 (en) * 2012-11-08 2017-07-18 Ab Sensing, Inc. Device for monitoring fouling deposits in a pulverized coal furnace
FI124057B (en) * 2012-12-05 2014-02-28 Metso Power Oy Arrangements in a thermal process and method for measuring the thickness of a soil layer
KR101780752B1 (en) * 2016-11-28 2017-09-27 한국생산기술연구원 A control system of furnance through monitoring of slag layer
CN111562589A (en) * 2020-04-20 2020-08-21 国网浙江省电力有限公司电力科学研究院 Method for monitoring slag bonding degree of water wall of power station boiler
CN112629453A (en) * 2020-11-27 2021-04-09 北京航天计量测试技术研究所 Ultrasonic monitoring device, system and method for ash deposition and slag bonding of water-cooled wall of coal gasifier

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