CN114112200A - Adjusting method of pipeline system for adjusting depressurization rate in boiler water overpressure experiment - Google Patents
Adjusting method of pipeline system for adjusting depressurization rate in boiler water overpressure experiment Download PDFInfo
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- CN114112200A CN114112200A CN202111462370.3A CN202111462370A CN114112200A CN 114112200 A CN114112200 A CN 114112200A CN 202111462370 A CN202111462370 A CN 202111462370A CN 114112200 A CN114112200 A CN 114112200A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002474 experimental method Methods 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 30
- 230000009467 reduction Effects 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000011946 reduction process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a method for adjusting a pressure reduction rate pipeline system in a boiler water overpressure experiment, belonging to the technical field of newly built boilers or boiler maintenance devices of thermal power plants; the system comprises a feed pump; the water feeding pump is connected with the boiler economizer and the steam pocket through a water supply pipeline; a regulating valve and a bypass valve are arranged on the water supply pipeline; the regulating valve is connected with the bypass valve in parallel; a water discharging device connected with the regulating valve in series is also arranged on the water supply pipeline; the pipeline of the bypass valve connected in parallel with the regulating valve is also provided with an auxiliary bypass valve in parallel; a check valve is also connected in series on a water supply pipeline of the regulating valve connected to a boiler blow-off pipe; a recirculation pipeline is also arranged at the water supply pump; the invention effectively solves the problems that the pressure of the boiler is too high and the pressure relief rate is difficult to control during the conventional pressure reduction, and the stress on the pressure surface of the boiler is too large due to the too high pressure relief in the early stage, so that the safety and the service life of equipment are influenced.
Description
Technical Field
The invention relates to the technical field of newly built boilers or boiler maintenance devices of thermal power plants, in particular to a method for adjusting a pressure reduction rate pipeline system in a boiler water overpressure experiment.
Background
A newly built boiler or a boiler needs to be subjected to a working pressure hydrostatic test after being overhauled so as to check whether the leakage phenomenon exists on the heating surface and other pressure-bearing parts of the boiler; especially the leakage condition of the welded junction, the overhauled valve and the pipeline after the large-area replacement of the heating surface of the boiler, and the overhauling quality of the boiler is ensured. Through an overpressure experiment, the strength level of the heated surface after running for many years is checked, the problem of cold exposure of the unit is solved in time, and safe and stable running of the unit after starting is ensured. Because the heated surface and each pressure-bearing part of the boiler bear great stress during the hydrostatic test, in order to reduce the stress of the pressure reduction to the boiler as much as possible, the pressure reduction speed of the hydrostatic test of the boiler has particularly strict requirements, the method generally adopted during the pressure reduction of the conventional power plant overpressure test is to close the water supply electric regulating valve and the electric bypass valve, and discharge water and reduce the pressure through a water discharge valve or a fixed discharge pipeline on a water supply pipeline; however, the pressure reduction method has some problems that the pressure reduction rate is difficult to control due to too high boiler pressure, and the pressure reduction is too fast in the early stage, so that the pressure reduction of the pressure surface of the boiler is instantaneous, huge stress is generated, and the safety and the service life of equipment are seriously damaged; this is also a major technical problem which needs to be solved urgently at present.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for adjusting the pressure reduction rate in the boiler water overpressure experiment is provided, and the problems that the boiler pressure is too high and the pressure reduction rate is difficult to control in the conventional pressure reduction process, and the pressure on the pressure surface of the boiler is too high due to too fast early pressure reduction, so that the safety and the service life of equipment are influenced are solved.
In order to solve the problems, the invention provides the following technical scheme:
a method for adjusting a pressure reduction rate pipeline system in a boiler water overpressure experiment; the system comprises a feed pump; the water feed pump is connected with the boiler steam drum and each heating surface through a water supply pipeline; a regulating valve and a bypass valve are arranged on the water supply pipeline; the regulating valve is connected with the bypass valve in parallel; a water discharging device connected with the regulating valve in series is also arranged on the water supply pipeline; the bypass valve is connected in parallel on the pipeline of the regulating valve and is also connected in parallel with an auxiliary bypass valve; a check valve is also connected in series on a water supply pipeline of the regulating valve connected to a boiler blow-off pipe; a recirculation pipeline is also arranged at the water supply pump; the adjusting method comprises the following steps:
s1, closing the regulating valve; the outlet pressure of the feed pump is adjusted through a recirculation pipeline of the feed pump, so that the pressure before and after the adjusting valve is consistent;
s2, opening the auxiliary bypass valve, controlling the outlet pressure of the feed pump to make the pressure before the auxiliary bypass valve lower than the pressure after the auxiliary bypass valve by about 0.1 Mpa;
s3, controlling the opening of the auxiliary bypass valve and the outlet pressure of the feed pump to reduce the pressure of the boiler for the first time;
s4, in the first pressure reduction, when the boiler is reduced until the check valve is completely closed, keeping the pressure before and after the bypass valve unchanged, and synchronously adjusting the outlet pressure of the feed water pump to make the pressure before and after the auxiliary bypass valve consistent; and then the boiler is subjected to secondary pressure reduction through a water discharging device.
Preferably, two groups of water feeding pumps are arranged and are connected to the water feeding pipeline in parallel; the same deaerator is shared on the recirculation pipelines of the two groups of feed water pumps.
Preferably, the boiler blow-off pipe comprises a boiler regular blow-off pipe and a boiler continuous blow-off pipe; and an accessory device is also arranged between the boiler blow-off pipe and the check valve.
Preferably, the regulating valve and the bypass valve are both in an electric valve structure, and the auxiliary bypass valve is in a manual valve structure.
The invention has the beneficial effects that:
according to the pressure reduction adjusting method, the manual bypass valve is in a certain opening degree, the pressures of the front and the rear of the manual bypass valve are basically consistent, when the pressure of the boiler is released too fast, the boiler water supply check valve is opened, the pressure of the boiler can be maintained in real time, the pressure reduction rate can be effectively controlled, and the instantaneous stress of a pressure surface can be reduced to the greatest extent.
Drawings
FIG. 1 is a schematic view of the piping structure of the present invention;
FIG. 2 shows the present embodiment
Description of reference numerals: 1. the system comprises a water feeding pump, 2, a regulating valve, 3, a bypass valve, 4, a water discharging pipe of a water feeding pipeline, 5, an auxiliary bypass valve, 6, a check valve, 7, a deaerator, 8, a periodic blow-off pipe of a boiler, 9, a continuous blow-off pipe of the boiler, 10 and accessory equipment.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
example (b):
referring to fig. 1, the present embodiment provides a method for adjusting a depressurization rate piping system during a boiler water overpressure experiment; the system comprises a water supply pump 1; the water feeding pump 1 is connected with a boiler sewage discharge pipe through a water supply pipeline; a regulating valve 2 and a bypass valve 3 are arranged on the water supply pipeline; the regulating valve 2 is arranged in parallel with the bypass valve 3; a water discharge pipe 4 of a water supply pipeline is also arranged on the water supply pipeline and is connected with the regulating valve 2 in series; an auxiliary bypass valve 5 is also arranged in parallel on the pipeline of the bypass valve 3 connected in parallel with the regulating valve 2; a check valve 6 is also connected in series on a water supply pipeline of the regulating valve 2 connected to a boiler blow-off pipe; a recirculation pipeline is also arranged at the water feeding pump 1; the adjusting method comprises the following steps:
s1, closing the regulating valve 2; the outlet pressure of the water feeding pump 1 is adjusted through a recirculation pipeline of the water feeding pump 1, so that the pressure before and after the adjusting valve 1 is consistent;
s2, opening the auxiliary bypass valve 5, controlling the outlet pressure of the feed water pump 1 to make the pressure before the auxiliary bypass valve 5 lower than the pressure after the auxiliary bypass valve;
s3, controlling the opening of the regulating valve 2 and the outlet pressure of the feed pump 1 to reduce the pressure of the boiler for the first time;
s4, in the first pressure reduction, when the boiler is reduced until the check valve 6 is completely closed, keeping the pressure before and after the bypass valve 3 unchanged, and synchronously adjusting the outlet pressure of the water feeding pump 1 to make the pressure before and after the auxiliary bypass valve 5 consistent; and then the boiler is subjected to secondary pressure reduction through the water discharging device 4.
The water feeding pumps 1 are arranged in two groups and are connected to a water feeding pipeline in parallel; the same deaerator 7 is shared on the recirculation pipelines of the two groups of feed water pumps 1.
The boiler blow-off pipe comprises a boiler regular blow-off pipe 8 and a boiler continuous blow-off pipe 9; and an accessory 10 is arranged between the boiler blow-off pipe and the check valve 6, and comprises a steam drum, a pressure gauge, a thermometer, a water level gauge and the like.
The regulating valve 2 and the bypass valve 3 are both electrically operated valve structures, and the auxiliary bypass valve 5 is a manual valve structure.
The inventor refers to a figure 2 of the change legend of pressure along with time in the pressure reduction process under the original process treatment before the modification of a 2# furnace boiler of a certain power generation limited company in south China sea of the Guangdong Foshan;
under the current process treatment after modification, the legend of the change of the pressure along with the time in the pressure reduction process refers to fig. 3; the pressure reduction process starts after the voltage stabilization for 80min
The specific pressure reduction process after modification comprises the following steps:
(1) when the pressure is increased to 11.35MPa, stopping boosting, after stabilizing the pressure for 20 minutes, reducing the pressure to 9.8MPa at the pressure of less than 0.2MPa/min, and then carrying out comprehensive inspection; the location where the anomaly was found must be accurately marked and recorded,
(2) the pressure reduction speed is 0.2-0.3 Mpa/min under 9.8Mpa,
(3) the pressure reduction speed is 0.3-0.4 Mpa/min under 3MPa,
(4) when the pressure is released to zero, all air doors are opened in sequence, all the superheaters and all the drainage doors of the economizer are opened in sequence, the periodic blowdown valve and the bottom header drain valve of the boiler drain the whole boiler, and the periodic blowdown bottom header drain valve of the boiler is closed to stop draining water after the water level of the boiler drum reaches the ignition water level.
As can be seen from fig. 2 and 3, when the pressure is reduced for the first time before the transformation, the pressure is close to the node pressure of 9.8MPa after only 5min, and after the device and the corresponding process transformation are carried out, the time for reaching the node of 9.8MPa is changed into 10 min, so that the average pressure reduction rate is less than 0.2MPa/min, and the pressure reduction requirement is met; meanwhile, as can be seen from fig. 3, the pressure reduction curve in the second pressure reduction process is smoother, and the effect of reducing the instantaneous stress of the pressure receiving surface is also achieved.
Claims (4)
1. A method for adjusting a pressure reduction rate pipeline system in a boiler water overpressure experiment comprises a water feed pump (1); the water feeding pump (1) is connected with the boiler steam drum through a water feeding pipeline; a regulating valve (2) and a bypass valve (3) are arranged on the water supply pipeline; the regulating valve (2) is arranged in parallel with the bypass valve (3); a water discharging device (4) which is connected with the regulating valve (2) in series is also arranged on the water supply pipeline; the method is characterized in that: an auxiliary bypass valve (5) is also arranged in parallel on the pipeline of the bypass valve (3) connected in parallel with the regulating valve (2); a check valve (6) is also connected in series on a water supply pipeline of the regulating valve (2) connected to a boiler blow-off pipe; a recirculation pipeline is also arranged at the position of the water feeding pump (1); the adjusting method comprises the following steps:
s1, closing the regulating valve (2) and opening the auxiliary bypass valve (5); the outlet pressure of the water feeding pump (1) is adjusted through a recirculation pipeline of the water feeding pump (1), and the pressure before and after the adjusting valve (2) is ensured to be consistent;
s2, opening the auxiliary bypass valve (5), controlling the outlet pressure of the feed pump (1) to make the pressure before the auxiliary bypass valve (5) lower than the pressure after the auxiliary bypass valve (5) by about 0.1 Mpa;
s3, controlling the opening of the regulating valve (5) and the outlet pressure of the feed pump (1) to reduce the pressure of the boiler for the first time;
s4, in the first pressure reduction, when the boiler is reduced until the check valve (6) is completely closed, keeping the front and back pressures of the auxiliary bypass valve (5) consistent, and synchronously adjusting the outlet pressure of the feed pump (1) to make the front and back pressures of the auxiliary bypass valve (5) consistent; and then the boiler is subjected to secondary pressure reduction through a water discharging device (4).
2. The method for adjusting the depressurization rate pipeline system in the boiler water overpressure experiment according to claim 1, wherein the method comprises the following steps: two groups of water feeding pumps (1) are arranged and are connected in parallel to a water supply pipeline; the same deaerator (7) is shared on the recirculation pipelines of the two groups of feed water pumps (1).
3. The method for adjusting the depressurization rate pipeline system in the boiler water overpressure experiment according to claim 1, wherein the method comprises the following steps: the boiler blow-off pipe comprises a boiler regular blow-off pipe (8) and a boiler continuous blow-off pipe (9), and water in each heating surface of the boiler is discharged through the boiler regular blow-off pipe (8) and the boiler continuous blow-off pipe (9) after the boiler overpressure experiment is finished; and an accessory device (10) is also arranged between the boiler blow-off pipe and the check valve (6).
4. The method for adjusting the depressurization rate pipeline system in the boiler water overpressure experiment according to claim 1, wherein the method comprises the following steps: the regulating valve (2) and the bypass valve (3) are both of an electric valve structure, and the auxiliary bypass valve (5) is of a manual valve structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111462370.3A CN114112200B (en) | 2021-12-02 | 2021-12-02 | Method for adjusting pipeline system for adjusting depressurization rate in boiler water overpressure experiment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111462370.3A CN114112200B (en) | 2021-12-02 | 2021-12-02 | Method for adjusting pipeline system for adjusting depressurization rate in boiler water overpressure experiment |
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| CN114112200A true CN114112200A (en) | 2022-03-01 |
| CN114112200B CN114112200B (en) | 2024-01-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263901A (en) * | 2021-12-02 | 2022-04-01 | 中国电建集团贵州电力设计研究院有限公司 | Adjusting method of pipeline system for adjusting boosting rate in boiler overpressure experiment |
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2021
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| CH378451A (en) * | 1960-04-06 | 1964-06-15 | Looser & Co Ag E | Oil burner system with an oil burner working according to the oil pressure atomization principle with a return nozzle and with a return oil valve to regulate the burner output |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263901A (en) * | 2021-12-02 | 2022-04-01 | 中国电建集团贵州电力设计研究院有限公司 | Adjusting method of pipeline system for adjusting boosting rate in boiler overpressure experiment |
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