CN117491050A - Hydrostatic test method based on pressure control of water supply main pipe - Google Patents
Hydrostatic test method based on pressure control of water supply main pipe Download PDFInfo
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- CN117491050A CN117491050A CN202311458975.4A CN202311458975A CN117491050A CN 117491050 A CN117491050 A CN 117491050A CN 202311458975 A CN202311458975 A CN 202311458975A CN 117491050 A CN117491050 A CN 117491050A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 149
- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 30
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 43
- 230000000630 rising effect Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 16
- 238000013461 design Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011217 control strategy Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a water pressure test method based on water supply main pressure control, which is characterized in that after judging that the water pressure mode withdrawal condition does not exist, a water pressure mode is put into, a water supply pump is controlled to boost the pressure of the water supply main through a superheater mode or a reheater mode, and a water supply pump instruction is corrected in real time according to the pressure feedback value of the water supply main. The beneficial effects of the invention are as follows: according to the principle that the relevance of the inlet pressure of the water supply main pipe, the reheater and the drum pressure is strong, the control object of the design hydrostatic test is set to be the water supply main pipe pressure, a whole set of closed-loop control strategy is set, after the corresponding mode is determined, the system automatically calculates according to the mode and the feedback value based on the pressure set value of the water supply pipe, the instruction of the water supply pump is corrected in real time, the corresponding instruction which is actually input is obtained, the automatic control of the hydrostatic test is realized, and the complete hydrostatic mode withdrawal condition is set, so that the hydrostatic test process is safer.
Description
Technical Field
The invention belongs to the field of boiler hydrostatic tests, and particularly relates to a hydrostatic test method based on water supply main pressure control.
Background
The boiler hydraulic test of the thermal power station is a test for checking whether cold drawing deformation, tightness, strength and the like of a pressure-bearing member of a boiler meet operation requirements or not under the condition that a chemical water treatment system can produce qualified desalted water under the condition that a thermal power unit meets the operation conditions before being started, and checking a defect position according to leakage, deformation and damage conditions during the hydraulic test so as to eliminate defects in time and not to influence the normal starting of the unit.
Taking subcritical thermal power generating units as an example, the hydrostatic test range is mainly divided into a boiler superheater system and a reheater system, and the subcritical thermal power generating unit comprises: water cooling system, overheat system, economizer system, main steam pipeline, reheat system and other water vapor pipeline valves. The test pressure of the superheater system of the pressure-receiving part of the boiler is set as the design working pressure of a steam drum, the test pressure of the reheater system is set as the design working pressure of a reheater inlet, after the conditions of the hydraulic test are met, a water supply pump is started to supply water to the boiler in the first step before the hydraulic test, the pressure is increased in the third step, a superheater primary temperature-reducing water regulating valve is utilized, the pressure of the superheater and the reheater system is synchronously increased by adopting a method of gradually increasing the rotating speed of the pump and increasing the pressure of the pump, the pressure increase is slowly carried out, instrument control equipment is cleaned after the pressure is increased to a certain fixed value, the pressure is continuously increased to a fixed value after the primary check of each pipeline, valve and heating surface in the boiler of the reheater system is carried out, the pressure is continuously increased to the inlet pressure of the reheater after no difference is confirmed, the pressure increase is stopped at the moment, the pressure increase is comprehensively checked on the reheater system, if no leakage is found after the inspection, the water pressure test of the reheater system is qualified, a high-pressure bypass is closed, all drain valves of the reheater system are opened, the reheater system is isolated and depressurized, when the pressure of the reheater system is slowly reduced to about a fixed value, the reheater system is flushed, when the pressure of the reheater system is depressurized to zero, the drain valve, an air exhaust valve and a low-pressure bypass valve of the reheater system are all opened, after the high-pressure bypass valve is confirmed to be closed, the pressure of the superheater system is increased, the pressure of the reheater system is monitored, the pressure of the superheater system is slowly increased to the designed working pressure of a steam drum, the pressure increase is stopped, the overall inspection is carried out on the superheater system, if no leakage is detected, the water pressure test of the superheater system is qualified, then the pressure of the superheater system is relieved, and when the pressure is slowly reduced to about a fixed value, the water supply sampling tube, the furnace water sampling tube and the water economizer are hydrophobic, the water drain pipe of the down pipe and the water drain pipe of the furnace bottom are washed, so that impurities in the water are discharged, and after the washing is finished, the water pressure test of the boiler is finished.
The hydraulic test process mainly comprises manual control, the boosting process is mainly judged according to experience of operators, a control object is divided into a reheater and a superheater system, the test pressure of the reheater system is designed to be the design working pressure of a reheater inlet, the test pressure of the superheater system is designed to be the design drum working pressure, the step-by-step continuity is poor, the boosting is mainly realized by manually increasing the output of a water supply pump by an operator in the test process, and the degree of automation is low in the test process.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a hydrostatic test method based on water supply main pressure control.
The hydrostatic test method based on the control of the pressure of the water supply main pipe comprises the following steps:
s1, after judging that the water pressure mode withdrawal condition does not exist, pouring a water pressure mode, controlling a water supply pump to boost a water supply main through a superheater mode or a reheater mode, and correcting a water supply pump instruction in real time according to a water supply main pressure feedback value;
s2, after the pressure of the water supply main pipe reaches a first set value, cleaning the instrument control equipment;
s3, continuously boosting the pressure of the main pipe to a second set value, and primarily checking the pipeline, the valve and the heating surface in the furnace of the superheater and reheater system;
s4, continuously boosting the pressure of the main pipe to the inlet pressure of the reheater, suspending boosting, and checking the reheater system; closing the high side valve, isolating the reheater system and releasing pressure;
and S5, boosting the superheater system, monitoring the pressure of the reheater, stopping boosting after the superheater system is boosted to the designed drum working pressure, checking the superheater system, and then decompressing the superheater system to finish the boiler hydraulic test.
Preferably, the water pressure mode withdrawal condition is specifically that the drum pressure is less than 1MPa, no main fuel trip signal is generated or the water supply temperature is greater than 100 ℃; when the water pressure mode withdrawal condition is satisfied, the water pressure mode is automatically withdrawn without boosting.
Preferably, the upper limit of the pressure setting of the water supply main pipe in the superheater mode is 20MPa, the upper limit of the pressure setting of the water supply main pipe in the reheater mode is 5MPa, and the water supply pump automatically increases the water pressure according to the pressure setting value of the water supply main pipe and corrects the water pressure in real time according to the pressure feedback value of the water supply main pipe.
Preferably, when the high side valve is in the closed state or the high side valve opening is less than 2% opening, it is judged that the high side valve has been closed, and the superheater mode is entered by manual adjustment.
Preferably, when the opening of the high side valve is greater than 10%, the high side valve is judged to be opened, and the reheater mode is automatically entered or entered by manual adjustment.
Preferably, after taking a large value from all the water feed pump outlet pressures, taking a small value from the high-pressure outlet water feed pressure as a water supply main pressure feedback value, correcting the command of the superheater mode or the reheater mode in real time, and outputting the water pressure mode water feed pump command.
Preferably, the maximum value of the rising rate is set, and when the pressure change rate of the main pipe is greater than the maximum value of the rising rate, the correction of the water feeding pump is automatically withdrawn, the current value is instructed to be maintained, the manual adjustment of the water feeding pump is performed, and the correction of the water feeding pump is started.
Preferably, when the deviation between the drum pressure and the feed water main pressure is greater than 2MPa, waiting for the deviation between the drum pressure and the feed water main pressure to be reduced to below 2MPa, and then performing the pressure increase or the pressure reduction of the next section.
Preferably, in step S4: after the reheater system is checked to be free of leakage, the high bypass valve is closed, each drain valve of the reheater system is opened, the reheater system is isolated and depressurized to a set value III, the reheater system is flushed, then the pressure of the reheater system is depressurized to zero, and the drain valve, the air exhaust and the low-pressure bypass valve of the reheater system are all opened.
Preferably, in step S5: after the superheater system is checked to be leak-free, the superheater system is depressurized to a fourth set value, and then a water supply sampling pipe, a furnace water sampling pipe, a coal economizer drain pipe, a downcomer drain pipe, a furnace bottom drain pipe and a superheater drain pipe are flushed.
The beneficial effects of the invention are as follows:
1) According to the method provided by the invention, according to the principle that the relevance between the water supply main pipe, the inlet pressure of the reheater and the drum pressure is strong in the water supply process, the control object of the design hydraulic test is set to be the water supply main pipe pressure, a whole set of closed-loop control strategy is set, the system automatically calculates according to the mode and the feedback value based on the pressure set value of the water supply pipe after the corresponding mode is determined, the instruction of the water supply pump is corrected in real time, the corresponding instruction which is actually input is obtained, the automatic control of the hydraulic test is realized, and the complete hydraulic mode withdrawal condition is set, so that the hydraulic test process is safer.
2) The invention is also provided with the maximum value of the rising rate, which is used for limiting the pressure change rate of the water supply main pipe, when the output of the water supply pump suddenly changes and the pressure change rate of the water supply main pipe is higher than the maximum value of the rising rate, the water supply pump is controlled manually, and an operator is required to reset and operate the water supply pump to execute an automatic instruction again, so that the pressure rising process is slow and stable, and the influence on the accuracy and the safety of the test caused by the overhigh pressure change rate of the water supply main pipe is avoided.
3) The invention also provides that when the difference between the drum pressure and the pressure of the water supply main pipe is large, the pressure set value of the water supply main pipe in the next stage is not input until the pressure difference is lower than a certain degree, and then the pressure is increased or reduced in the next stage, thereby effectively ensuring the stability and the safety of the whole system.
Drawings
FIG. 1 is a diagram of a hydraulic mode input logic;
FIG. 2 is a hydraulic mode feed pump command generation logic;
FIG. 3 is a hydrostatic test mode operation panel;
FIG. 4 shows the boosting and reducing process of a certain 350MW subcritical unit hydrostatic test.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1
As an example, as shown in fig. 1 to 2, the hydrostatic test method based on the control of the pressure of the parent pipe comprises the following steps:
s1, after judging that the water pressure mode withdrawal condition does not exist, throwing into the water pressure mode, wherein the water pressure mode withdrawal condition is specifically as follows: the pressure of the steam drum is less than 1MPa, no main fuel trip signal is generated or the water supply temperature is more than 100 ℃;
when the pressure of the steam drum is more than 1MPa, the superheater and the reheater are fully filled with water, so that the pressure can be increased; if the pressure of the steam drum is lower than 1MPa, the water pressure test is finished and the water pressure mode is automatically withdrawn;
the main fuel trip signal is abbreviated as MFT, and the hydraulic mode can only be allowed to be put into operation under the condition that the boiler MFT signal exists, so that the hydraulic mode is automatically withdrawn after the MFT signal is reset, namely the MFT signal does not exist;
the unfired water supply temperature of the boiler is necessarily less than 100 ℃ in the hydraulic test, so that the hydraulic mode is automatically withdrawn when the water supply temperature is greater than 100 ℃, and misoperation investment is prevented when the unit is in normal operation.
When the water pressure mode withdrawal condition is satisfied, the water pressure mode is automatically withdrawn without boosting.
Because the boiler water feeding process has clear relevance with reheater inlet pressure and drum pressure, and the pressure difference is relatively fixed, the water feeding pump is controlled through the superheater mode or the reheater mode to boost the pressure of the water feeding main, and the water feeding pump automatically boosts the pressure according to the water feeding set value of the water feeding main, and corrects in real time according to the pressure feedback value of the water feeding main, the method specifically comprises the following steps: after taking a large value from the outlet pressure of the three water feed pumps and taking a small value from the high-pressure outlet water feed pressure as a pressure feedback value of a water supply main pipe, real-time correction is carried out on the command of the superheater mode or the reheater mode, the water pressure mode water feed pump command is output, system feedback is considered, and the command is modified in real time according to the feedback value, so that closed-loop control is formed, and the system has good consistency.
Based on the above control method, steps S2 to S5 are implemented.
S2, after the pressure of the water supply main pipe reaches a first set value, cleaning the instrument control equipment;
s3, continuously boosting the pressure of the main pipe to a second set value, and primarily checking the pipeline, the valve and the heating surface in the furnace of the superheater and reheater system;
s4, after confirming that the pressure of the water supply main pipe is not different, continuously boosting to the inlet pressure of the reheater, suspending boosting, checking the reheater system, and indicating that the hydrostatic test of the reheater system is qualified if no leakage is found after the checking is finished; after the reheater system is checked to be free of leakage, the high bypass valve is closed, each drain valve of the reheater system is opened, the reheater system is isolated and depressurized to a set value III, the reheater system is flushed, then the pressure of the reheater system is depressurized to zero, and the drain valve, the air exhaust and the low-pressure bypass valve of the reheater system are all opened.
S5, boosting the superheater system, monitoring the pressure of the reheater, stopping boosting after the superheater system is boosted to the designed drum working pressure, checking the superheater system, comprehensively checking the superheater system, and indicating that the water pressure test of the superheater system is qualified if no leakage exists after the checking is finished; after the superheater system is checked to be leak-free, the superheater system is depressurized to a fourth set value, and then a water supply sampling pipe, a furnace water sampling pipe, a coal economizer drain pipe, a downcomer drain pipe, a furnace bottom drain pipe and a superheater drain pipe are flushed so as to drain impurities.
And (5) finishing the water pressure test of the boiler.
Example two
As another embodiment, the second embodiment proposes a more specific hydrostatic test method based on the control of the pressure of the parent pipe on the basis of the first embodiment.
After the water pressure mode is put into, the water supply main control is forcibly removed manually, and the superheater mode or the reheater mode is selected for automatic control, and the pressure of the water supply main is controlled in both modes. Different upper limits are set for the head pipe pressure in the superheater mode and the reheater mode respectively.
As shown in fig. 2, when the high side valve is in the closed state or the high side valve opening is less than 2% opening, it is judged that the high side valve has been closed, and the superheater mode is entered by manual adjustment. The upper limit of the feed water main pressure in the superheater mode is set to 20MPa.
When the opening of the high side valve is more than 10%, the high side valve is judged to be opened, the reheater mode is automatically entered, and the reheater mode can be entered through manual adjustment. The upper limit of the feedwater pipe pressure in the reheater mode is set to 5MPa.
As shown in FIG. 3, the "put in" and "withdraw" buttons are set, the hydraulic pressure mode can be put in and withdrawn manually by an operator, the GO and HOLD buttons are also set on the matched operation picture window, a certain rising rate is set to prevent the pressure from rising too fast, the pressure of the water supply main is set to be changed at the back point GO button according to the rate of 0.5MPa/min, in order to prevent the force mutation of the water supply pump, the pressure change rate of the water supply main is too fast, the rising rate within 10 seconds is set to be larger than 0.2MPa, or the deviation between the actual pressure value of the water supply main and the set value is larger than 1.0MPa, the automatic state of the water supply pump is automatically withdrawn to operate, and the current value is instructed to be kept. The manual adjustment of the feed pump is performed by the staff, and then the correction of the feed pump is started.
When the deviation between the pressure of the steam drum and the pressure of the water supply main pipe is more than 2MPa, the pressure set value is automatically kept unchanged, and the HOLD button automatically lightens. And waiting for the deviation value of the drum pressure and the water supply main pressure to be reduced to below 2MPa, and then carrying out the boosting or the depressurization of the next section.
It should be noted that, in this embodiment, the same or similar parts as those in the first embodiment may be referred to each other, and will not be described in detail in this application.
Example III
As another embodiment, the third embodiment proposes that the hydrostatic test method based on the pressure control of the water supply main pipe is applied to the hydrostatic test boosting and reducing process of a certain 350MW subcritical unit based on the first and second embodiments, as shown in fig. 4.
In the hydraulic test before the unit is started, a curve of the pressure change of a water supply main pipe along with time in the boosting and depressurizing process is shown in fig. 4, a reheater mode is selected after the hydraulic test mode is put into, the water supply pressure is firstly set to be 5.5MPa, the water supply pressure is limited by the upper limit of the reheater mode to be 5MPa, the final output water supply pressure is set to be 5MPa, and the boosting rate is 0.3MPa/min.
The actual water supply pressure is stabilized at 5MPa after 8min from 3.1MPa, and the water pressure test of the reheater mode is started.
After the reheater mode test is finished, selecting a superheater mode, setting the water supply pressure to be 20MPa, and starting the superheater mode hydraulic test after 49 minutes until the actual water supply pressure reaches 19.9 MPa.
After the superheater mode test is finished, the water supply pressure is gradually set to 17MPa, 5MPa and 2MPa, and the pressure is reduced, and the data in the figure show that the rising and falling periods of the actual water supply pressure are stable, so that the whole-course automation of the water pressure test is basically realized.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by a difference from other embodiments, and identical and similar parts between the embodiments are referred to each other.
Claims (10)
1. The hydrostatic test method based on the control of the pressure of the water supply main pipe is characterized by comprising the following steps of:
s1, after judging that the water pressure mode withdrawal condition does not exist, pouring a water pressure mode, controlling a water supply pump to boost a water supply main through a superheater mode or a reheater mode, and correcting a water supply pump instruction in real time according to a water supply main pressure feedback value;
s2, after the pressure of the water supply main pipe reaches a first set value, cleaning the instrument control equipment;
s3, continuously boosting the pressure of the main pipe to a second set value, and primarily checking the pipeline, the valve and the heating surface in the furnace of the superheater and reheater system;
s4, continuously boosting the pressure of the main pipe to the inlet pressure of the reheater, suspending boosting, and checking the reheater system; closing the high side valve, isolating the reheater system and releasing pressure;
and S5, boosting the superheater system, monitoring the pressure of the reheater, stopping boosting after the superheater system is boosted to the designed drum working pressure, checking the superheater system, and then decompressing the superheater system to finish the boiler hydraulic test.
2. The hydrostatic test method based on parent pipe pressure control according to claim 1, wherein the hydrostatic mode withdrawal conditions are specifically a drum pressure of less than 1MPa, no main fuel trip signal or a feedwater temperature of greater than 100 ℃; when the water pressure mode withdrawal condition is satisfied, the water pressure mode is automatically withdrawn without boosting.
3. The hydrostatic test method based on a head pipe pressure control according to claim 1, wherein the head pipe pressure setting upper limit of the superheater mode is 20MPa, the head pipe pressure setting upper limit of the reheater mode is 5MPa, and the head pump automatically boosts the water according to the head pipe pressure setting value and corrects in real time according to the head pipe pressure feedback value.
4. The hydrostatic test method based on head pipe pressure control according to claim 1, wherein when the high side valve is in a closed state or the high side valve opening is less than 2% opening, it is judged that the high side valve has been closed, and at this time, the superheater mode is entered by manual adjustment.
5. The hydrostatic test method based on head pipe pressure control according to claim 1, wherein when the high side valve opening is greater than 10%, it is determined that the high side valve has been opened, the reheater mode is automatically entered, or the reheater mode is entered by manual adjustment.
6. The hydrostatic test method based on control of feed water main pressure according to claim 1, wherein after taking a large value from all feed water pump outlet pressures, taking a small value with the high feed water outlet pressure as a feed water main pressure feedback value, real-time correction is performed on the command of the superheater mode or the reheater mode, and the feed water pump command of the hydrostatic mode is output.
7. The hydrostatic test method based on control of a main pressure according to claim 6, wherein a maximum value of the rising rate is set, and when the main pressure change rate is greater than the maximum value of the rising rate, the correction of the water feed pump is automatically withdrawn, the current value is instructed to be maintained, the manual adjustment of the water feed pump is performed, and the correction of the water feed pump is started.
8. The hydrostatic test method based on head pipe pressure control according to claim 1, wherein when the deviation of the drum pressure and the head pipe pressure is greater than 2MPa, the deviation of the drum pressure and the head pipe pressure is waited to be reduced below 2MPa, and then the pressure of the next section is increased or reduced.
9. The hydrostatic testing method based on the control of the pressure of a parent pipe according to claim 1, wherein in step S4: after the reheater system is checked to be free of leakage, the high bypass valve is closed, each drain valve of the reheater system is opened, the reheater system is isolated and depressurized to a set value III, the reheater system is flushed, then the pressure of the reheater system is depressurized to zero, and the drain valve, the air exhaust and the low-pressure bypass valve of the reheater system are all opened.
10. The hydrostatic testing method based on the control of the pressure of a parent pipe according to claim 1, wherein in step S5: after the superheater system is checked to be leak-free, the superheater system is depressurized to a fourth set value, and then a water supply sampling pipe, a furnace water sampling pipe, a coal economizer drain pipe, a downcomer drain pipe, a furnace bottom drain pipe and a superheater drain pipe are flushed.
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| CN202311458975.4A CN117491050A (en) | 2023-11-03 | 2023-11-03 | Hydrostatic test method based on pressure control of water supply main pipe |
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| CN202311458975.4A CN117491050A (en) | 2023-11-03 | 2023-11-03 | Hydrostatic test method based on pressure control of water supply main pipe |
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