CN113405726B - Method for leakage detection and disturbance-free leakage blocking in boiler under operation state of boiler economizer - Google Patents
Method for leakage detection and disturbance-free leakage blocking in boiler under operation state of boiler economizer Download PDFInfo
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- CN113405726B CN113405726B CN202110695070.3A CN202110695070A CN113405726B CN 113405726 B CN113405726 B CN 113405726B CN 202110695070 A CN202110695070 A CN 202110695070A CN 113405726 B CN113405726 B CN 113405726B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 230000000903 blocking effect Effects 0.000 title claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000003245 coal Substances 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/002—Investigating fluid-tightness of structures by using thermal means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the technical field of circulating fluidized bed boilers, and particularly relates to a method for detecting leakage in a boiler and stopping leakage without disturbance under the running state of a boiler economizer. The method comprises the following steps: leak detection: the temperature of the coal economizer is collected through the collecting unit and is transmitted to the data processing unit, whether the temperature is different from the initial set temperature or not is judged, and if the temperature of a certain area is different, the area is preliminarily determined to be leaked; removing the upper pipe of the pipe screen header pipe seat at the leakage area for heat preservation, and numbering the upper pipe of the economizer header pipe seat in the area; measuring the temperature of the outer surface of the tube one by one and recording; if the outer surface temperature of one pipe is higher than that of other pipes, the leakage of the pipe screen can be accurately judged; plugging: and (5) carrying out pressurized plugging on the leakage pipe screen in the boiler operation state. The invention can cause leakage in the economizer furnace in the normal running state of the boiler, realize the accurate detection of the leakage position without stopping the furnace of the boiler and implement the leakage blocking of the economizer tube panel, and reduce the loss.
Description
Technical Field
The invention belongs to the technical field of circulating fluidized bed boilers, and particularly relates to a method for detecting leakage in a boiler and stopping leakage without disturbance under the running state of a boiler economizer.
Background
The circulating fluidized bed boiler economizer and the superheater are important four-pipe components of the boiler, the single-stage economizer is composed of more than 100 groups of pipe screen groups, the pipe screen pitch is generally designed to be 30-40 mm, the pipe screen height is generally designed to be more than 1200mm, the operating temperature of the economizer is about 400 ℃, once the pipe screen of the economizer leaks during the operation of the boiler, the boiler must be shut down for maintenance, the shortest time required for only maintaining the leakage point position is 96 hours, and the economic loss caused by once boiler shut down is more than 100 ten thousand yuan.
The shutdown maintenance procedure is as follows:
1. after the furnace is shut down for 48 hours, the temperature of the tail part of the boiler, namely the economizer part, is reduced to below 50 ℃ from 400 ℃, overhaulers enter the leakage point part for hydraulic test, and after the leakage point is accurately determined (namely the single-screen leakage point is found in more than 100 groups of pipe screens), the leakage pipe screen is plugged at the straight pipe part of the header pipe seat.
2. After the leakage pipe screen is blocked, a hydraulic test is needed to be carried out again, and the boiler is ignited again to operate after the hydraulic test is qualified.
In view of the above, the design and manufacture of the method for leakage detection and disturbance-free leakage blocking in the boiler under the running state of the boiler economizer (namely, leakage detection and leakage blocking are directly carried out under the condition of no shutdown), which is particularly important in actual production and operation.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a method for detecting leakage and stopping leakage without disturbance in a boiler under the running state of a boiler economizer.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an in-furnace leakage detection and disturbance-free leakage stopping method for a boiler economizer in an operating state comprises the following steps:
(1) Leak detection of economizer in boiler in operation state of circulating fluidized bed boiler
(1) The temperature of the economizer is acquired in real time through the acquisition unit, acquired information is transmitted to the data processing unit, the data processing unit judges whether the acquired information is different from the initial set temperature, and if the temperature of a certain area is different, the area is preliminarily determined to leak;
(2) removing a pipe screen header guard plate at the leakage area determined in the step (1), numbering the pipes at the upper part of the pipe seat of the economizer header in the area, such as the 1 st and the 2 nd of the north number;
(3) marking a plurality of contour lines on each pipe, and measuring and recording the outer surface temperature of the pipe at each contour line position one by one, wherein the interval between each contour line and each contour line is 2-3 mm;
(4) in the recorded values (the recorded data is 10 groups), if the temperature of the ten groups of outer surfaces of one pipe is higher than the temperature of other pipes (the specific temperature difference is more than 30 ℃), the leakage of the pipes of the pipe screen of the economizer can be accurately judged;
(2) Plugging of economizer tube panel in operation state of circulating fluidized bed boiler
(1) Carrying out pressurized plugging on the leakage pipe screen;
(2) and operating the equipment, opening a hole (the aperture is preferably phi 6) at the upper part of the inlet of the plugging pipe, and if the opening has no overflow water, confirming that the plugging is successful.
Preferably, in the leak detection process of the in-furnace economizer in the operation state of the circulating fluidized bed boiler, the step (1) further comprises humidity acquisition. The temperature and humidity information is acquired through the thermometer and the hygrometer, the acquired information is transmitted to the data processing unit, the data processing unit judges whether the acquired information is different from the originally set temperature and humidity, and if the temperature and humidity of a certain area are different, the area is preliminarily determined to be leaked.
Preferably, the collecting unit is a thermometer.
Preferably, the data processing unit is a microprocessor.
Further preferably, the microprocessor is a DCS.
Preferably, the number of contours on each tube is 10.
Compared with the prior art, the invention has the beneficial effects that:
1. the method can accurately detect the unique position (such as the 1 st group or the 2 nd group) of the leakage of the tube panel of the economizer in the boiler and implement the non-stop plugging under the normal running state of the boiler, thereby avoiding the unplanned stopping of the boiler and greatly reducing the loss;
2. the method is simple to operate, accurate in judgment method and high in accuracy.
Detailed Description
The invention is further illustrated, but is not limited, by the following examples.
Example 1
The on-line leakage detection and plugging method for the economizer tube panel is completed through the following steps:
(1) Leakage detection of economizer in operation state of circulating fluidized bed boiler
(1) Acquiring the temperature of the economizer in real time through a thermometer, transmitting acquired information to a DCS processor, judging that the temperature of the area A is different by the DCS processor, primarily determining that the area A leaks, and transmitting the leakage area to a display unit (particularly a display);
(2) the wet ash in the area A is obtained through tamping, the leakage position is determined again, the pipe screen header guard plate at the area A determined in the step (1) is removed, the pipes at the upper part of the pipe seat of the economizer header in the area are numbered, and 116 pipelines are sequentially numbered from 1 to 116 in the area A in the embodiment;
(3) measuring and recording the outlet temperature of a header of the pipelines of 1-116 one by one (as shown in Table 1), marking 10 contour lines on each pipe by using a stone pen, measuring and recording the outer surface temperature of the pipes at the positions of the 10 contour lines one by one, wherein the interval between each contour line is 2-3mm, and the measured temperature data of all the pipes of each number are 10;
(4) according to the data recorded in Table 1, it is found that 10 measured temperatures of the pipes (the header outlets) of the 5 th group are all higher than the measured temperatures of other pipes by more than 30 ℃, so that the leakage position of the pipe screen of the economizer (i.e. the pipe with the number of 5) can be accurately judged;
it should be noted that: the data are shown in table 1, and since the numbers from the tube on the north side are used for numbering, the numbers are shown as north 1, north 2, etc.
Table 1 economizer leakage header outlet tube test temperature
(2) Leakage stopping of circulating fluidized bed boiler economizer leakage pipe screen
(1) The leakage pipe screen is subjected to pressure leakage stoppage (the pressure leakage stoppage is realized by adopting the conventional technology in the field and is not repeated here);
(2) and operating the equipment, opening phi 6 holes at the inlet part of the plugging tube panel, and if the holes are provided with no overflow water, confirming that the plugging is successful.
If the plugging fails, the pressurized plugging process is repeated.
As can be seen from the table, ten temperature values tested on the outer surface of the 5 th pipeline are higher than the outer surface temperature of other pipes by more than 30 ℃ and the abnormal fluctuation of the test data (the abnormal fluctuation data refer to the instantaneous jump of the outer surface temperature of the pipeline between 180 ℃ and 239 ℃) when the outer surface temperature of the pipe is leaked during the temperature measurement period, the abnormal increase of the outer surface temperature of the leaked pipe can be accurately judged, so that the pipe screen is the pipe screen (pipeline) leaked in the furnace.
The theoretical basis of judgment is as follows: after the coal economizer tube panel leaks, the Shan Bingguan panel accelerates the steam-water flow rate in the tube due to leakage, increases the heat exchange quantity of the pipeline, and causes the temperature of the outer surface of the leakage pipeline to rise.
By the leakage detection and plugging method, the operation of the boiler equipment is performed, and the economic loss caused by unplanned furnace shutdown is avoided by more than 100 ten thousand yuan.
Example 2
This embodiment differs from embodiment 1 in that: the humidity test was increased.
It should be noted that: the pressurized plugging technology is adopted by the conventional technology in the field; the DCS processor is used and connected to the acquisition unit (thermometer, hygrometer) and the display is connected by conventional techniques in the art, and will not be described herein.
Claims (6)
1. The method for detecting leakage in the boiler and stopping leakage without disturbance in the running state of the boiler economizer is characterized by comprising the following steps:
(1) On-line leakage detection without stopping furnace for economizer furnace leakage in running state of circulating fluidized bed boiler
(1) The temperature of the economizer is acquired in real time through the acquisition unit, acquired information is transmitted to the data processing unit, the data processing unit judges whether the acquired information is different from the initial set temperature, and if the temperature of a certain area is different, the area is preliminarily determined to leak;
(2) removing an economizer header guard plate at the position of the leakage area in the economizer furnace determined in the step (1), and numbering the upper pipe of the economizer header tube seat in the area;
(3) marking a plurality of contour lines on each pipe, and measuring and recording the outer surface temperature of the pipe at each contour line position one by one, wherein the interval between each contour line and each contour line is 2-3 mm;
(4) in the recorded values, if the temperature of the outer surface of one pipe is higher than that of other pipes, the leakage of the pipe screen of the economizer can be accurately judged;
(2) Leakage blocking of leakage tube panel in economizer furnace in operation state of circulating fluidized bed boiler economizer
(1) Carrying out pressured plugging on the leakage pipe screen pipe, and plugging the inlet end and the outlet end of the leakage pipe screen pipe of the economizer in the furnace under pressure;
(2) and opening holes at the upper part of the inlet of the plugging tube panel, and if no overflow water exists at the opening holes, confirming that plugging is successful.
2. The method for detecting leakage and plugging without disturbance in a furnace according to claim 1, wherein in step (1), step (1) further comprises collecting humidity.
3. The method for detecting leakage and stopping leakage without disturbance in boiler according to claim 1, wherein the collecting unit is a thermometer.
4. The method for detecting leakage and stopping leakage without disturbance in boiler according to claim 1, wherein the data processing unit is a microprocessor.
5. The method for detecting leakage and stopping leakage without disturbance in boiler according to claim 4, wherein said microprocessor is DCS.
6. The method for leak detection and disturbance-free plugging in a furnace in a boiler economizer operating condition according to claim 1 wherein the number of contour lines on each tube is 10.
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| CN202110695070.3A CN113405726B (en) | 2021-06-23 | 2021-06-23 | Method for leakage detection and disturbance-free leakage blocking in boiler under operation state of boiler economizer |
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| CN202110695070.3A CN113405726B (en) | 2021-06-23 | 2021-06-23 | Method for leakage detection and disturbance-free leakage blocking in boiler under operation state of boiler economizer |
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Citations (3)
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| CN206904949U (en) * | 2017-07-11 | 2018-01-19 | 河钢股份有限公司承德分公司 | A kind of detection means for boiler economizer leakage inline diagnosis |
| CN112254015A (en) * | 2020-09-21 | 2021-01-22 | 汕头大学 | Heterogeneous multi-agent under-pressure leakage blocking method and system based on 5G communication |
| JP2021011992A (en) * | 2019-07-09 | 2021-02-04 | 株式会社日立製作所 | Boiler tube leakage early detection system and method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206904949U (en) * | 2017-07-11 | 2018-01-19 | 河钢股份有限公司承德分公司 | A kind of detection means for boiler economizer leakage inline diagnosis |
| JP2021011992A (en) * | 2019-07-09 | 2021-02-04 | 株式会社日立製作所 | Boiler tube leakage early detection system and method thereof |
| CN112254015A (en) * | 2020-09-21 | 2021-01-22 | 汕头大学 | Heterogeneous multi-agent under-pressure leakage blocking method and system based on 5G communication |
Non-Patent Citations (1)
| Title |
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| 宋志军 ; .循环流化床锅炉高温省煤器入口集箱接管座泄漏的分析.化工管理.2018,(第27期),全文. * |
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