CN114112200B - Method for adjusting pipeline system for adjusting depressurization rate in boiler water overpressure experiment - Google Patents
Method for adjusting pipeline system for adjusting depressurization rate in boiler water overpressure experiment Download PDFInfo
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- CN114112200B CN114112200B CN202111462370.3A CN202111462370A CN114112200B CN 114112200 B CN114112200 B CN 114112200B CN 202111462370 A CN202111462370 A CN 202111462370A CN 114112200 B CN114112200 B CN 114112200B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002474 experimental method Methods 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 230000000737 periodic effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 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
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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
Abstract
The invention discloses an adjusting method for a pipeline system for adjusting a depressurization rate in a boiler water overpressure experiment, and belongs to the technical field of newly-built boilers or boiler overhaul devices of thermal power plants; the system comprises a feed pump; the water supply pump is connected with the boiler economizer and the steam drum through water supply pipelines; a regulating valve and a bypass valve are arranged on the water supply pipe; the regulating valve is connected with the bypass valve in parallel; the water supply pipeline is also provided with a water discharging device connected with the regulating valve in series; an auxiliary bypass valve is also arranged on a pipeline of the bypass valve which is connected in parallel with the regulating valve; a check valve is also connected in series on a water supply pipeline of which the regulating valve is connected to the boiler blow-down 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, the pressure release rate is difficult to control during conventional depressurization, and the pressure release is too fast in the early stage, so that the stress on the pressure bearing surface of the boiler is too large, and the safety and the service life of equipment are affected.
Description
Technical Field
The invention relates to the technical field of newly-built boilers or boiler overhaul devices of thermal power plants, in particular to a method for adjusting a pipeline system for adjusting a depressurization rate during a boiler water overpressure experiment.
Background
A new boiler or a hydraulic test of working pressure is needed after the boiler is overhauled so as to check whether the heating surface of the boiler and other pressure-bearing members have leakage or not; especially the welded junction after the large-area replacement of the heating surface of the boiler and the leakage condition of overhauling valves and pipelines ensure the overhauling quality of the boiler. Through an overpressure experiment, the strength level of the heated surface after operation for a plurality of years is checked, the problem of cold exposure of the unit is solved in time, and the safe and stable operation of the unit after starting is ensured. Because the heating surface and each pressure-bearing member 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 is particularly strictly required, and the common method adopted during the pressure reduction of the overpressure test of the conventional power plant is to close a water supply electric regulating valve and an electric bypass valve, and discharge water through a water discharge valve or a fixed discharge pipeline on a water supply pipeline for pressure reduction; however, the depressurization method has some problems that the pressure of the boiler is too high, the pressure release rate is difficult to control, the early pressure release is too fast, the instantaneous pressure release of the pressure bearing surface of the boiler is caused, huge stress is generated, and the safety and the service life of equipment are seriously damaged; this is also a major technical problem that is currently in urgent need.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method for adjusting the pipeline system for adjusting the depressurization rate in the boiler water overpressure experiment is provided, so that the problems that the pressure of a boiler is too high, the depressurization rate is difficult to control, and the pressure on a pressure bearing surface of the boiler is too high due to too high early depressurization, and the safety and the service life of equipment are affected are solved.
In order to solve the problems, the invention provides the following technical scheme:
an adjusting method for a pipeline system for adjusting the depressurization rate during a boiler water overpressure experiment; the system comprises a feed pump; the water supply pump is connected with the boiler drum and each heating surface through a water supply pipeline; a regulating valve and a bypass valve are arranged on the water supply pipe; the regulating valve is connected with the bypass valve in parallel; the water supply pipeline is also provided with a water discharging device connected with the regulating valve in series; the bypass valve is connected in parallel with a 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 which the regulating valve is connected to the boiler blow-down pipe; a recirculation pipeline is also arranged at the water supply pump; the adjusting method comprises the following steps:
s1, closing a regulating valve; the outlet pressure of the water supply pump is regulated through a recirculation pipeline of the water supply pump, so that the pressure before and after the regulating valve is consistent;
s2, opening the auxiliary bypass valve, and controlling the outlet pressure of the water supply pump to enable the pressure before the auxiliary bypass valve to be lower than the pressure after the auxiliary bypass valve by about 0.1Mpa;
s3, controlling the opening degree of the auxiliary bypass valve and the pressure of the outlet of the water supply pump so as to reduce the pressure of the boiler for the first time;
s4, after the boiler is depressurized to the state that the check valve is completely closed in the first depressurization, keeping the pressure before and after the bypass valve unchanged, and synchronously adjusting the outlet pressure of the water supply pump to enable the pressure before and after the auxiliary bypass valve to be consistent; and then the boiler is subjected to secondary depressurization through a water discharging device.
Preferably, the water supply pumps are provided with two groups which are all connected in parallel to the water supply pipeline; the same deaerator is shared on the recirculation line of both sets of feedwater pumps.
Preferably, the boiler blow-down pipes comprise boiler periodic blow-down pipes and boiler continuous blow-down pipes; and accessory equipment is arranged between the boiler blow-down pipe and the check valve.
Preferably, the regulating valve and the bypass valve are both of an electric valve structure, and the auxiliary bypass valve is of a manual valve structure.
The invention has the beneficial effects that:
according to the pressure reducing and regulating method designed by the invention, the manual bypass valve is at a certain opening degree, the front pressure and the rear pressure of the valve are basically consistent, when the pressure of the boiler is relieved too fast, the boiler water supply check valve can be opened, the boiler pressure can be maintained immediately, the pressure reducing rate can be effectively controlled, and the instantaneous stress of the pressure receiving surface can be reduced to the greatest extent.
Drawings
FIG. 1 is a schematic view of a pipeline according to the present embodiment;
FIG. 2 is a schematic diagram of the present embodiment
Reference numerals illustrate: 1. the boiler comprises a water supply pump, 2, a regulating valve, 3, a bypass valve, 4, a water supply pipeline drain pipe, 5, an auxiliary bypass valve, 6, a check valve, 7, a deaerator, 8, a boiler periodic drain pipe, 9, a boiler continuous drain pipe, 10 and accessory equipment.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples:
examples:
referring to fig. 1, the embodiment provides a method for adjusting a pipeline system for adjusting a depressurization rate in a boiler water overpressure experiment; the system comprises a feed pump 1; the water supply pump 1 is connected with a boiler blow-down pipe through a water supply pipeline; a regulating valve 2 and a bypass valve 3 are arranged on the water supply pipe; the regulating valve 2 is arranged in parallel with the bypass valve 3; the water supply pipeline is also provided with a water supply pipeline water discharge pipe 4 connected with the regulating valve 2 in series; an auxiliary bypass valve 5 is also arranged on the pipeline of the bypass valve 3 which is 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 the boiler blow-down pipe; a recirculation pipeline is also arranged at the water feed pump 1; the adjusting method comprises the following steps:
s1, closing a regulating valve 2; the outlet pressure of the water feed pump 1 is regulated through a recirculation pipeline of the water feed pump 1, so that the pressure of the regulating valve 1 is consistent;
s2, opening the auxiliary bypass valve 5, and controlling the outlet pressure of the water feed pump 1 to enable the pressure before the auxiliary bypass valve 5 to be lower than the pressure after the auxiliary bypass valve 5;
s3, controlling the opening degree of the regulating valve 2 and the outlet pressure of the feed pump 1 so as to reduce the pressure of the boiler for the first time;
s4, in the first depressurization, after the boiler is depressurized to the state that 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 feed pump 1 to enable the pressure before and after the auxiliary bypass valve 5 to be consistent; and then the boiler is subjected to secondary depressurization through the water discharging device 4.
The water supply pumps 1 are provided with two groups which are all connected in parallel to the water supply pipeline; the same deaerator 7 is shared on the recirculation line of both sets of feed pumps 1.
The boiler blow-down pipes comprise a boiler periodic blow-down pipe 8 and a boiler continuous blow-down pipe 9; and an accessory device 10 is arranged between the boiler blow-down pipe and the check valve 6, and the accessory device 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 of an electric valve structure, and the auxiliary bypass valve 5 is of a manual valve structure.
The inventor refers to fig. 2 for a diagram of the change of pressure with time in the depressurization process under the original process treatment before the boiler of the No. 2 boiler of a certain power generation limited company in south China sea of Buddha in Guangdong is reformed;
the diagram of the pressure change with time in the depressurization process after the transformation is shown in FIG. 3; the depressurization process is started after 80min of voltage stabilization
The specific technological process of reducing the pressure after transformation is as follows:
(1) Stopping boosting when the pressure is raised to 11.35MPa, stabilizing the pressure for 20 minutes, reducing the pressure to 9.8MPa at a pressure of less than 0.2MPa/min, and then performing comprehensive inspection; the place where the anomaly is found must be marked and recorded accurately,
(2) The depressurization rate is 0.2 to 0.3MPa/min below 9.8MPa,
(3) The depressurization rate is 0.3 to 0.4MPa/min under 3MPa,
(4) When the pressure is released until the reading of the drum pressure gauge is zero, all air valves are sequentially opened, all superheaters and all drain valves of the economizer are sequentially opened, the boiler periodic blowdown valve and the bottom header drain valve drain the whole boiler, and when the drum water level of the boiler reaches the ignition water level, the boiler periodic blowdown bottom header drain valve stops draining.
As can be seen from fig. 2 and 3, when the pressure is reduced for the first time before the transformation, the pressure of the node is close to 9.8MPa after only 5min, and after the transformation of equipment and corresponding technology, the time for reaching the 9.8MPa node is changed to 10 min, so that the average pressure reduction rate is 0.2MPa/min, and the pressure reduction requirement is met; meanwhile, as can be seen from fig. 3, the depressurization curve in the second depressurization process is smoother, and the function of reducing the instantaneous stress of the pressed surface is also achieved.
Claims (4)
1. An adjusting method for adjusting a depressurization rate pipeline system during boiler water overpressure experiments comprises a water feed pump (1); the water supply pump (1) is connected with a boiler drum through a water supply pipeline; a regulating valve (2) and a bypass valve (3) are arranged on the water supply pipe; the regulating valve (2) is connected with the bypass valve (3) in parallel; a water discharging device (4) 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 on a pipeline of the bypass valve (3) which is 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 the boiler blow-down pipe; a recirculation pipeline is also arranged at the water feed pump (1); the adjusting method comprises the following steps:
s1, closing a regulating valve (2) and opening an auxiliary bypass valve (5); the outlet pressure of the water feed pump (1) is regulated through a recirculation pipeline of the water feed pump (1), so that the pressure of the regulating valve (2) is consistent;
s2, opening an auxiliary bypass valve (5), and controlling the outlet pressure of the water feed pump (1) to enable the pressure before the auxiliary bypass valve (5) to be lower than the pressure after the auxiliary bypass valve (5) by 0.1Mpa;
s3, controlling the opening degree of the regulating valve (2) and the outlet pressure of the water supply pump (1) to reduce the pressure of the boiler for the first time;
s4, after the boiler is depressurized to the state that the check valve (6) is completely closed in the first depressurization, keeping the front and rear pressures of the auxiliary bypass valve (5) consistent, and synchronously adjusting the outlet pressure of the water feed pump (1) to make the front and rear pressures of the auxiliary bypass valve (5) consistent; and then the boiler is subjected to secondary depressurization through a water discharging device (4).
2. The method for adjusting the pressure reduction rate pipeline system during boiler water overpressure experiments according to claim 1, wherein the method comprises the following steps of: the water supply pumps (1) are provided with two groups which are connected in parallel to the water supply pipeline; the same deaerator (7) is shared on the recirculation pipeline of the two groups of water feed pumps (1).
3. The method for adjusting the pressure reduction rate pipeline system during boiler water overpressure experiments according to claim 1, wherein the method comprises the following steps of: the boiler blow-down pipe comprises a boiler periodic blow-down pipe (8) and a boiler continuous blow-down pipe (9), and water in each heating surface of the boiler is discharged through the boiler periodic blow-down pipe (8) and the boiler continuous blow-down pipe (9) after the boiler overpressure experiment is completed; and an accessory device (10) is arranged between the boiler blow-down pipe and the check valve (6).
4. The method for adjusting the pressure reduction rate pipeline system during boiler water overpressure experiments according to claim 1, wherein the method comprises the following steps of: 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.
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| 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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| 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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| 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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| GB822012A (en) * | 1954-11-26 | 1959-10-21 | Gen Electric | Improvements relating to fluid pressure reducing apparatus |
| 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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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 |
| US5398655A (en) * | 1994-01-14 | 1995-03-21 | Walbro Corporation | Manifold referenced returnless fuel system |
| JPH09250740A (en) * | 1996-03-14 | 1997-09-22 | Babcock Hitachi Kk | Cwm combustion device |
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