CN110081788B - Special scale for sealing installation of air preheater - Google Patents
Special scale for sealing installation of air preheater Download PDFInfo
- Publication number
- CN110081788B CN110081788B CN201910405967.0A CN201910405967A CN110081788B CN 110081788 B CN110081788 B CN 110081788B CN 201910405967 A CN201910405967 A CN 201910405967A CN 110081788 B CN110081788 B CN 110081788B
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- CN
- China
- Prior art keywords
- ruler
- air preheater
- installation
- air
- deformation
- Prior art date
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Links
- 238000007789 sealing Methods 0.000 title claims abstract description 51
- 238000009434 installation Methods 0.000 title claims abstract description 39
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 235000001674 Agaricus brunnescens Nutrition 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910000737 Duralumin Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/02—Rulers with scales or marks for direct reading
- G01B3/04—Rulers with scales or marks for direct reading rigid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
- G01C9/24—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble
Abstract
The invention relates to preheater equipment, in particular to a special ruler for installing an air preheater sealing device, which comprises a ruler plate, a measuring ruler and a bubble type horizontal indicator, wherein the upper edge of the ruler plate is a curve contour installation line for indicating the installation position of the upper side of a radial hot end sealing piece. The invention aims to provide a measuring scale for sealing installation of an air preheater and provides a nonlinear reverse deformation installation method. The nonlinear reverse deformation installation method is to obtain deformation amount according to a deformation curve by utilizing an informatization means, and the reverse deformation installation curve is adopted by more precise installation without re-breaking line segments. This mounting method can further greatly reduce the air leakage gap. And the mushroom deformation of the part is counteracted, the air leakage quantity of the air preheater is greatly reduced, the unit benefit is improved, the air leakage gap of the air preheater is reduced, and the air leakage quantity of the air preheater is reduced.
Description
Technical Field
The invention relates to preheater equipment, in particular to a special scale for sealing installation of an air preheater.
Background
Along with the increasing strictness of national energy-saving and environment-friendly policies, coal electricity is developing towards high efficiency, energy conservation and environment protection. The air preheater is still a core key device for influencing the energy-saving and environment-friendly indexes of the coal motor group, and the rotary air preheater is still the most advanced and popular large-scale air preheater form worldwide so as to improve the installation quality of the air preheater, and firstly, the installation quality of a sealing element is ensured.
The air leakage rate is an important indicator for measuring the air preheater. The air leakage of the air preheater is divided into direct air leakage and carrying air leakage. The carrying air leakage is small, and is unavoidable due to the structure of the air preheater. The direct air leakage is caused by a certain gap between the air and the flue gas in order to ensure the safe operation of the air preheater. The direct air leakage is divided into radial air leakage, axial air leakage, bypass air leakage and central barrel air leakage. Wherein the radial air leakage accounts for about 80% of the direct air leakage. The air leakage rate can greatly reduce the output of a unit, increase the power consumption of a plant and reduce the running economy of equipment.
Controlling the amount of air leakage from the air preheater is most important to reduce the leakage gap. To reduce radial leakage, a sealing plate is typically added between the movable fan-shaped seal plate in the upper portion of the air preheater and the continuously rotating rotor. The sealing piece can reduce radial leakage clearance and reduce air leakage quantity. However, when the air preheater is expected to operate in a hot state, the temperature difference between the cold end and the hot end of the rotor can reach 300 ℃ during the operation because the rotor of the rotary air preheater has a large diameter. The temperature differential causes the rotor to undergo a "mushroom" non-linear deformation. This can result in uneven and large gap between the adjustable seal plates of the hot side radial seal, resulting in increased air leakage from the air preheater. The maximum deformation of the mushroom shape can reach 80mm. In the case of thermal operation, the rotor is deformed to a large extent, and the linear installation method cannot well reduce the air leakage gap due to the nonlinear characteristics of deformation. Although the method of adopting the flexible spring sealing assembly is adopted at present to reduce the air leakage gap, the deformation of the elastic elements at all parts of the rotor is inconsistent during operation, so that equipment is greatly damaged, meanwhile, the flexible spring sealing assembly has a complex structure, the complete set of the flexible spring sealing assembly is expensive to replace, and the operation economy is poor.
In the installation process of the sealing element of the traditional air preheater, a straight installation scale made of channel steel is adopted. However, the deformation of the preheater is a non-linear irregular mushroom deformation, resulting in poor sealing effect under hot conditions, thereby reducing the operation efficiency of the unit.
Disclosure of Invention
In the existing air preheater sealing method, the sealing device is installed in a straight line. But the linear installation cannot effectively solve the problem of air leakage of the air preheater. Also, a method for installing a sealing device by folding lines has been proposed, in which a sealing sheet is divided into segments, each segment is adjusted according to a thermal state operation deformation amount of an air preheater rotor, and finally a radial sealing device is formed in a form of a folding line segment obliquely upward. However, the installation method cannot completely solve the problem of increased air leakage gap in hot running. The invention aims to provide a measuring scale for sealing installation of an air preheater and provides a nonlinear reverse deformation installation method. The nonlinear reverse deformation installation method is to obtain deformation amount according to a deformation curve by utilizing an informatization means, and the reverse deformation installation curve is adopted by more precise installation without re-breaking line segments. This mounting method can further greatly reduce the air leakage gap. And the mushroom deformation of the part is counteracted, the air leakage quantity of the air preheater is greatly reduced, the unit benefit is improved, the air leakage gap of the air preheater is reduced, and the air leakage quantity of the air preheater is reduced. The technical scheme adopted by the invention is as follows:
the special scale for mounting the air preheater sealing device comprises a scale plate, a measuring scale and a bubble type horizontal indicator, wherein the upper edge of the scale plate is a curve contour mounting line for indicating the upper side mounting position of a radial hot end sealing piece.
The special scale for installing the air preheater sealing device is characterized in that the position of each point on the curve outline of the installation line is expressed by a formulaCalculating to obtain;
the alpha is the linear expansion coefficient of the rotor at the position at the average temperature;
the delta T is an average temperature difference and delta T= (Tgi+Tao)/2- (Tgo +Tai)/2, wherein Tgi and Tgo are respectively the average temperature of the flue gas side and the outlet of the air preheater, and Tai and Tao are respectively the average temperature of the air side and the outlet of the air preheater;
and r is the radius of the rotor, and H is the height of the rotor.
The special ruler for installing the air preheater sealing device is characterized in that a chute is formed in the ruler plate, the lower end of the measuring ruler can slide or be fixed in the chute, and the chute coincides with the straight line side of the sealing piece when the air preheater sealing device is used.
Above-mentioned air heater sealing device installs special scale, be equipped with the gyro wheel in the spout, the lower extreme spiro union of dipperstick is on the gyro wheel.
Above-mentioned special scale of air heater sealing device installation, the thickness of chi board is 8~10mm, the material is light duralumin alloy or stainless steel.
The invention has the advantages that: the nonlinear measuring scale of the invention enables the sealing piece of the air preheater to be installed in nonlinear reverse deformation. Compared with the linear installation of the same type of technology at home and abroad at present, the nonlinear reverse deformation installation can further offset the increase of the air leakage gap caused by the partial mushroom deformation, and reduce the air leakage quantity. The scale has the measuring and positioning functions, and can improve the mounting precision of radial seal and the mounting quality.
Drawings
FIG. 1 is a schematic view of a conventional seal-mounted rotor in cold running;
FIG. 2 is a schematic diagram of a conventional seal-mounted rotor in thermal operation;
FIG. 3 is a schematic view of the seal installation cold state operation structure of the present invention;
FIG. 4 is a schematic view of the seal installation thermal state operation structure of the present invention;
FIG. 5 is a schematic view of the air preheater rotor seal mounting construction of the present invention;
FIG. 6 is a front view of a dedicated scale of the present invention;
fig. 7 is an a-direction cross-sectional view of the special scale of the present invention.
In the figure, 1, a sealing plate, 2, a radial hot end sealing sheet, 3, a rotor, 4, a scale ruler plate, 5, a chute, 6, a measuring ruler, 7, a fixing nut, 8, a horizontal indicator, 9, an installation line, 10, a roller, 11, a radial cold end sealing sheet, 12 and an axial sealing sheet.
Detailed Description
The invention is further explained below with reference to the drawings.
The special scale for mounting the air preheater sealing device comprises a scale plate 4, a measuring scale 6 and a bubble type horizontal indicator 8, wherein the upper edge of the scale plate 4 is a curve contour mounting line 9 for indicating the upper side mounting position of a radial hot end sealing piece.
The special scale for installing the air preheater sealing device is characterized in that the position of each point on the curve outline of the installation line 9 is expressed by a formulaCalculating to obtain;
the alpha is the linear expansion coefficient of the rotor at the position at the average temperature;
the delta T is an average temperature difference and delta T= (Tgi+Tao)/2-Tgo +Tai/2, the Tgi and Tgo are respectively the average temperature of the flue gas side and the outlet of the air preheater, and the Tai and the Tao are respectively the average temperature of the air side and the outlet of the air preheater;
and r is the radius of the rotor, and H is the height of the rotor.
The special ruler for installing the air preheater sealing device is characterized in that the ruler plate 4 is provided with the sliding groove 5, the lower end of the measuring ruler 6 can slide or be fixed in the sliding groove 5, and the sliding groove 5 coincides with the straight line side of the sealing piece in use.
The special scale for installing the air preheater sealing device is characterized in that the roller 10 is arranged in the chute 5, and the lower end of the measuring scale 6 is in threaded connection with the roller 10.
Above-mentioned special scale of air heater sealing device installation, ruler board 4 thickness is about 9mm, and the material is selected difficult flexible light duralumin alloy or stainless steel, guarantees certain thickness and makes the scale be difficult for warping, and whole processing guarantees machining precision. The upper edge of the scale is a finish radian, namely a reverse deformation installation line 9, and the reverse deformation installation line 9 is obtained according to the calculation formula. A chute 5 with a height of about 8mm and a width of about 4mm is formed in the ruler plate 4, the position of the chute 5 coincides with the straight side of the hot end sealing piece 2, and a proper roller 10 is placed in the chute 5. The roller 10 is provided with an error measuring ruler 6. The error measuring ruler 6 can freely slide left and right in the chute 5, and scales are marked on the measuring ruler 6 to measure the error between the installed hot end sealing piece 2 and the installation line 9 so as to adjust the installation position of the hot end sealing piece 2 and check the installation precision. The bubble level indicator 8 facilitates the alignment of the level position during the installation process, further improves the installation accuracy, and checks the installation accuracy. The radial cold end sealing plate 11 is mounted on the hot end sealing plate 2 in the same way, and the mounting line 9 is only required to be adjusted according to a formula.
The axial deformation condition is different from the radial deformation condition, the rotor 3 is still in a straight line after being deformed in a mushroom shape in the axial direction, the axial deformation is small, and the axial sealing piece 12 only needs to reserve the width of the deformation when being installed.
Claims (3)
1. The utility model provides an air heater sealing device installs special scale which characterized in that: the measuring device comprises a ruler plate (4), a measuring ruler (6) and a bubble type horizontal indicator (8), wherein the upper edge of the ruler plate (4) is a curve profile mounting line (9) for indicating the upper side mounting position of a radial hot end sealing piece; a sliding groove (5) is formed in the ruler plate (4), the lower end of the measuring ruler (6) can slide or be fixed in the sliding groove (5), and the sliding groove (5) coincides with the straight line side of the sealing piece when the ruler is used;
the position of each point on the curved profile of the mounting line (9) is formulatedCalculating to obtain;
the alpha is the linear expansion coefficient of the rotor at the position at the average temperature;
the delta T is an average temperature difference and delta T= (Tgi+Tao)/2- (Tgo +Tai)/2, wherein Tgi and Tgo are respectively the average temperature of the flue gas side and the outlet of the air preheater, and Tai and Tao are respectively the average temperature of the air side and the outlet of the air preheater;
and r is the radius of the rotor, and H is the height of the rotor.
2. The air preheater sealing apparatus installation specific ruler of claim 1, wherein: the sliding chute (5) is internally provided with a roller (10), and the lower end of the measuring ruler (6) is in threaded connection with the roller (10).
3. The air preheater sealing apparatus installation specific ruler of claim 1, wherein: the thickness of the ruler plate (4) is 8-10 mm, and the ruler plate is made of light hard aluminum alloy or stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910405967.0A CN110081788B (en) | 2019-05-16 | 2019-05-16 | Special scale for sealing installation of air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910405967.0A CN110081788B (en) | 2019-05-16 | 2019-05-16 | Special scale for sealing installation of air preheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110081788A CN110081788A (en) | 2019-08-02 |
| CN110081788B true CN110081788B (en) | 2024-01-19 |
Family
ID=67420258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910405967.0A Active CN110081788B (en) | 2019-05-16 | 2019-05-16 | Special scale for sealing installation of air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110081788B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0554958A1 (en) * | 1992-02-05 | 1993-08-11 | Shell Internationale Researchmaatschappij B.V. | Apparatus and method for pipe or tube inspection |
| US6279647B1 (en) * | 1996-08-15 | 2001-08-28 | Abb Air Preheater Inc. | Method and device for sensing a clearance |
| CN201731507U (en) * | 2010-01-25 | 2011-02-02 | 山东泓奥电力科技有限公司 | Elastic clearance self-compensating sealing device for rotary air preheater |
| CN206122952U (en) * | 2016-08-31 | 2017-04-26 | 重庆化医中昊化工设备制造安装有限公司 | A specific location frock that is used for air heater to go up heat exchange tube and board sealing of tube |
| CN107270321A (en) * | 2017-08-04 | 2017-10-20 | 四川大智工程技术有限公司 | A kind of intelligent sealing system of air preheater |
| CN107894007A (en) * | 2017-11-08 | 2018-04-10 | 上海锅炉厂有限公司 | A kind of floating regenerative air heater hot junction radial sealing system |
| CN207456351U (en) * | 2017-09-25 | 2018-06-05 | 重庆电力建设总公司 | Air preheater seal clearance adjusts scale |
| CN209763902U (en) * | 2019-05-16 | 2019-12-10 | 中国电建集团山东电力建设第一工程有限公司 | Special scale for sealing installation of air preheater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6543520B2 (en) * | 2001-02-21 | 2003-04-08 | Alstom Power N.V. | Low-distortion axial seal plate for air preheaters |
| US8776864B2 (en) * | 2009-08-17 | 2014-07-15 | Paragon Airheater Technologies, Inc. | Full contact flexible seal assembly for heat exchanger |
-
2019
- 2019-05-16 CN CN201910405967.0A patent/CN110081788B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0554958A1 (en) * | 1992-02-05 | 1993-08-11 | Shell Internationale Researchmaatschappij B.V. | Apparatus and method for pipe or tube inspection |
| US6279647B1 (en) * | 1996-08-15 | 2001-08-28 | Abb Air Preheater Inc. | Method and device for sensing a clearance |
| CN201731507U (en) * | 2010-01-25 | 2011-02-02 | 山东泓奥电力科技有限公司 | Elastic clearance self-compensating sealing device for rotary air preheater |
| CN206122952U (en) * | 2016-08-31 | 2017-04-26 | 重庆化医中昊化工设备制造安装有限公司 | A specific location frock that is used for air heater to go up heat exchange tube and board sealing of tube |
| CN107270321A (en) * | 2017-08-04 | 2017-10-20 | 四川大智工程技术有限公司 | A kind of intelligent sealing system of air preheater |
| CN207456351U (en) * | 2017-09-25 | 2018-06-05 | 重庆电力建设总公司 | Air preheater seal clearance adjusts scale |
| CN107894007A (en) * | 2017-11-08 | 2018-04-10 | 上海锅炉厂有限公司 | A kind of floating regenerative air heater hot junction radial sealing system |
| CN209763902U (en) * | 2019-05-16 | 2019-12-10 | 中国电建集团山东电力建设第一工程有限公司 | Special scale for sealing installation of air preheater |
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| Publication number | Publication date |
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| CN110081788A (en) | 2019-08-02 |
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