CN218093171U - 700MW thermal power generating unit prevents device that vapour pump minimum flow valve erodees - Google Patents
700MW thermal power generating unit prevents device that vapour pump minimum flow valve erodees Download PDFInfo
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- CN218093171U CN218093171U CN202222761065.0U CN202222761065U CN218093171U CN 218093171 U CN218093171 U CN 218093171U CN 202222761065 U CN202222761065 U CN 202222761065U CN 218093171 U CN218093171 U CN 218093171U
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- pump
- flow valve
- minimum flow
- operated gate
- electrically operated
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000002955 isolation Methods 0.000 claims abstract description 21
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000009991 scouring Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
A700 MW thermal power generating unit prevents the device that the minimum flow valve of vapor pump erodees. The prior art does not have a device which can effectively avoid scouring the minimum flow valve of the air pump, guarantees the tightness of the minimum flow valve and enables the air pump to operate safely and stably for a long time. The utility model discloses the constitution includes: deaerator (1), deaerator top be connected with back hand door (9) through the pipeline, back hand door be connected with minimum flow valve (8), minimum flow valve be connected with preceding pneumatic isolation door (7), preceding pneumatic isolation door be connected with vapour pump export electrically operated gate (10), steam-operated feed water pump (4) through the pipeline respectively, steam-operated feed water pump pass through the pipeline and be connected with leading pump (3), leading pump pass through the pipeline and be connected with leading pump entry electrically operated gate (2), leading pump entry electrically operated gate pass through the pipeline with the bottom of deaerator is connected. The utility model is used for 700MW thermal power generating unit prevents the device that the minimum flow valve of turbopump erodees.
Description
The technical field is as follows:
the utility model relates to a thermal power generating unit water supply system technical field, concretely relates to 700MW thermal power generating unit prevents device that turbopump minimum flow valve erodees.
The background art comprises the following steps:
the system comprises a water supply system of the thermal power generating unit, a steam pump and a steam pump, wherein a water supply pump is an important auxiliary machine of the thermal power generating unit, and a minimum flow valve of the steam pump is an important valve for protecting unsafe operation of the water supply pump; the minimum flow valve of the steam pump is a high-pressure valve in a water supply system, the pressure of the outlet of the steam pump is the highest in a thermal power generating unit system, the tightness of the minimum flow valve is an important ring for energy conservation, and if the minimum flow valve of the steam pump does not strictly reduce the water supply flow, the water supply flow of a boiler is reduced, and the unit cannot run at full load; the minimum flow valve of the steam pump is flushed for a long time, so that the base of the valve core with the minimum flow is blown and damaged, the minimum flow valve cannot be opened, the steam pump is easy to vaporize when the minimum flow valve is not opened, and the small engine can overspeed; the outlet pressure of the steam pump is highest, the pressure of the subcritical unit reaches 20MPa, the pressure of the supercritical unit is higher, the minimum flow valve is high in on-line isolation risk and is not easy to isolate; the minimum flow valve cost for overhaul treatment is about 80 ten thousand.
At present, the prior art does not have a device, so that the minimum flow valve of the steam pump can be effectively prevented from being flushed, the tightness of the minimum flow valve is ensured, and the steam pump can be safely and stably operated for a long time.
The utility model has the following contents:
the utility model aims at providing a 700MW thermal power generating unit prevents device that vapour pump minimum flow valve erodees. The structure mainly changes the manual door in front of the minimum flow valve of the steam pump into a pneumatic isolation door, can avoid scouring the minimum flow valve of the steam pump, ensures that the minimum flow valve is tight, can protect the starting isolation door and the minimum flow valve to be opened under special conditions, and ensures that the steam pump can safely and stably operate.
The above purpose is realized by the following technical scheme:
the utility model provides a device that 700MW thermal power generating unit prevents vapour pump minimum flow valve and erodees which constitutes and includes: the oxygen-eliminating device, oxygen-eliminating device top be connected with back hand-operated gate through the pipeline, back hand-operated gate be connected with minimum flow valve, minimum flow valve be connected with preceding pneumatic isolation door, preceding pneumatic isolation door be connected with vapour pump export electrically operated gate, vapour-operated water-feeding pump through the pipeline respectively, vapour-operated water-feeding pump pass through the pipeline and be connected with the prepositive pump, the prepositive pump pass through the pipeline and be connected with prepositive pump entry electrically operated gate, prepositive pump entry electrically operated gate pass through the pipeline with the bottom of oxygen-eliminating device is connected.
700MW thermal power generating unit prevent the device that the minimum flow valve of vapour pump erodees, vapour move water feed pump top install over heater temperature reduction water electrically operated gate, re-heater temperature reduction water electrically operated gate through the pipeline respectively, vapour pump export electrically operated gate be connected with high entry electrically operated gate, high bypass electrically operated gate that adds through the pipeline respectively, high entry electrically operated gate that adds pass through high pressure heater and high exit electrically operated gate that adds.
Has the advantages that:
1. the utility model relates to a 700MW thermal power generating unit prevents device that vapour pump minimum flow valve erodees, this structure is mainly to 700MW subcritical unit, A vapour pump rated flow 1440T H, minimum flow 660A T H, manual door is changed into pneumatic isolation door before the minimum flow valve of vapour pump, before setting up pneumatic isolation door, parts such as back manual door protect, pneumatic isolation door before closing during vapour pump normal operating, avoid the erodeing to vapour pump minimum flow valve, guarantee that the minimum flow valve is tight, can protect pneumatic isolation door and minimum flow valve before opening when special conditions again, guarantee vapour pump safety and stability operation.
2. The front manual door of the minimum flow valve of the steam pump is replaced by a front pneumatic isolation door, which is a pneumatic closing spring opening type valve, and the steam pump is opened after air and electricity are lost, so that the safety of the steam pump is ensured; and related logic protection is added to the front pneumatic isolation door, the front pneumatic isolation door is closed when the steam pump operates normally, the flushing of the minimum flow valve of the steam pump is avoided, the tightness of the minimum flow valve is ensured, the front pneumatic isolation door and the minimum flow valve can be protected to be opened and started under special conditions, and the safe and stable operation of the steam pump is ensured.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the automatic control system comprises a deaerator, 2, a front-mounted pump inlet electric door, 3, a front-mounted pump, 4, a steam-driven water feeding pump, 5, a superheater desuperheating water electric door, 6, a reheater desuperheating water electric door, 7, a front pneumatic isolation door, 8, a minimum flow valve, 9, a rear manual door, 10, a steam pump outlet electric door, 11, a high-pressure inlet electric door, 12, a high-pressure outlet electric door and 13, a high-pressure bypass electric door.
The specific implementation mode is as follows:
example 1:
the utility model provides a device that 700MW thermal power generating unit prevents vapour pump minimum flow valve and erodees which constitutes and includes: deaerator 1, deaerator top be connected with back hand door 9 through the pipeline, back hand door be connected with minimum flow valve 8, minimum flow valve be connected with preceding pneumatic isolation door 7, preceding pneumatic isolation door be connected with vapour pump export electrically operated gate 10, vapour driven feed-water pump 4 through the pipeline respectively, vapour driven feed-water pump pass through the pipeline and be connected with leading pump 3, leading pump pass through the pipeline and be connected with leading pump entry electrically operated gate 2, leading pump entry electrically operated gate pass through the pipeline with the bottom of deaerator is connected.
Example 2:
according to the device for preventing the minimum flow valve of the steam pump from being flushed in the 700MW thermal power generating unit in embodiment 1, a superheater temperature-reducing electric door 5 and a reheater temperature-reducing electric door 6 are respectively installed above the steam-driven feed water pump through pipelines, the electric door at the outlet of the steam pump is respectively connected with a high pressure inlet electric door 11 and a high pressure bypass electric door 13 through pipelines, and the high pressure inlet electric door is connected with a high pressure inlet electric door 12 through a high pressure heater;
the pneumatic isolation door before the minimum flow valve of the steam pump has the specific logic:
(1) The opening and closing permission logic is always '1', and opening and closing are permitted at any time;
(2) Protection and opening:
A. the minimum flow valve of the steam pump is automatically put into use,
B. the load of the unit is less than 450MW, the water level of the steam drum is more than 100mm,
C. the flow of the water supply flow plus or minus warm water is larger than the flow of the main steam, the rotating speed of a small engine is less than 4000RPM,
when the three conditions are simultaneously met, the front pneumatic isolating door is protected to be opened.
(3) The manual quick-opening button is put into, and the pneumatic isolating door is opened quickly.
Experiments prove that after a manual door in front of the minimum flow valve of the steam pump of the unit A is replaced by a front pneumatic isolating door, the temperature of the minimum flow valve body is reduced to 60 ℃ from the original temperature of 130 ℃, the minimum flow valve is strict, and the flow of the steam pump is reduced by 150T/H; the minimum flow valve is not flushed any more, and is not blocked any more, so that the maintenance of the minimum flow valve is avoided, the safe and stable operation of the unit is ensured, and the cost is saved by 100 ten thousand.
Claims (2)
1. The utility model provides a device that 700MW thermal power generating unit prevented turbopump minimum flow valve and erodees which constitutes includes: oxygen-eliminating device, characterized by: deaerator top pass through the pipeline and be connected with back hand-operated gate, back hand-operated gate be connected with minimum flow valve, minimum flow valve be connected with preceding pneumatic isolation door, preceding pneumatic isolation door be connected with vapour pump export electrically operated gate, vapour driven feed water pump through the pipeline respectively, vapour driven feed water pump pass through the pipeline and be connected with leading pump, leading pump pass through the pipeline and be connected with leading pump entry electrically operated gate, leading pump entry electrically operated gate pass through the pipeline with the bottom of deaerator is connected.
2. The device of claim 1 for preventing the flushing of the minimum flow valve of a steam pump of a 700MW thermal power generating unit, which is characterized in that: steam feed pump top install over heater desuperheating water electrically operated gate, reheater desuperheating water electrically operated gate through the pipeline respectively, steam pump export electrically operated gate be connected with high entry electrically operated gate, high bypass electrically operated gate that adds through the pipeline respectively, high entry electrically operated gate that adds pass through high pressure feed water heater and high export electrically operated gate that adds be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222761065.0U CN218093171U (en) | 2022-10-20 | 2022-10-20 | 700MW thermal power generating unit prevents device that vapour pump minimum flow valve erodees |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222761065.0U CN218093171U (en) | 2022-10-20 | 2022-10-20 | 700MW thermal power generating unit prevents device that vapour pump minimum flow valve erodees |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218093171U true CN218093171U (en) | 2022-12-20 |
Family
ID=84457890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222761065.0U Active CN218093171U (en) | 2022-10-20 | 2022-10-20 | 700MW thermal power generating unit prevents device that vapour pump minimum flow valve erodees |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218093171U (en) |
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2022
- 2022-10-20 CN CN202222761065.0U patent/CN218093171U/en active Active
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