CN217872943U - Steam supply system with stable steam source pressure of water supply pump steam turbine of coal-fired power plant - Google Patents
Steam supply system with stable steam source pressure of water supply pump steam turbine of coal-fired power plant Download PDFInfo
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- CN217872943U CN217872943U CN202222310101.1U CN202222310101U CN217872943U CN 217872943 U CN217872943 U CN 217872943U CN 202222310101 U CN202222310101 U CN 202222310101U CN 217872943 U CN217872943 U CN 217872943U
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Abstract
The utility model provides a steam supply system with stable steam source pressure of a water feeding pump steam turbine of a coal-fired power plant, which comprises a low-pressure steam source steam supply system, a four-section steam extraction steam supply system, an auxiliary steam source steam supply system and a cold re-steam extraction steam supply system; one end of the low-pressure steam source steam supply system is connected with an auxiliary steam source steam supply system and a four-section steam extraction steam supply system which are mutually connected in parallel, and the other end of the low-pressure steam source steam supply system is respectively connected with a cold re-steam extraction steam supply system in parallel and is connected into a water feeding pump steam turbine; the auxiliary steam source steam supply system comprises a first auxiliary steam source steam supply pipeline, a second auxiliary steam source steam supply pipeline and a third auxiliary steam source steam supply pipeline; the steam-driven water-feeding pump can maintain the pressure of the steam source of the steam-driven water-feeding pump to be always stable when the coal-fired unit operates in an ultra-low load state or during accident handling, so that the steam-driven water-feeding pump has good linear adjustment characteristics, and the aim of stabilizing the water-feeding flow and ensuring the safety of the unit is fulfilled; the scheme of the application is reasonable, simple in structure, easy to realize and low in modification cost.
Description
Technical Field
The utility model belongs to the technical field of thermal power, concretely relates to coal fired power plant's feed pump steam turbine steam source pressure stability's steam supply system.
Background
At present, a steam-driven feed pump is generally adopted in a thermal power plant as a boiler water supply mode, and therefore a steam source with stable pressure and temperature needs to be configured for a feed pump steam turbine to ensure the good adjusting characteristic of the rotating speed of a small steam turbine. Especially, as the deep peak regulation work of the thermal power generating unit is greatly carried out, the ultra-low unit load becomes a normal state, the extraction steam of the cold reheat steam section and the extraction steam of the four sections are very low when the ultra-low load section runs, and the stability of the steam source pressure of the water supply pump steam turbine is tested.
The steam source of the water feeding pump steam turbine of the coal-fired power plant is generally taken from cold reheat steam section extraction steam, four-section extraction steam and auxiliary steam. When in normal operation, steam is supplied by four-stage steam extraction, and when the pressure of four-stage steam extraction is insufficient, steam is supplied by cold water, and when a feed water pump is debugged or a unit is started or stopped and accident is handled, auxiliary steam is supplied.
In the prior art, a long-time heating pipe is needed in the switching process of auxiliary steam supply and four-pumping and cold-supplying steam, and the whole process needs personnel to manually adjust a steam supply electric door to maintain the stability of the pressure of a water supply pump air source, so that time and energy are consumed, especially, in the accident handling process, once the adjustment is not timely and easily caused disturbance of boiler water supply flow, severe accidents such as boiler water shortage and even water fullness are caused, and equipment damage is caused, and the safety of a unit is seriously threatened.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a coal fired power plant's water-feeding pump steam turbine steam source pressure stability's steam supply system to the potential safety hazard that steam source pressure fluctuation caused when solving unit degree of depth peak shaving or incident treatment.
The utility model discloses a realize through following technical scheme:
a steam supply system with stable steam source pressure of a water-feeding pump steam turbine of a coal-fired power plant comprises a low-pressure steam source steam supply system, a four-section steam extraction steam supply system, an auxiliary steam source steam supply system and a cold re-extraction steam supply system;
one end of the low-pressure steam source steam supply system is connected with an auxiliary steam source steam supply system and a four-section steam extraction steam supply system which are mutually connected in parallel, and the other end of the low-pressure steam source steam supply system is respectively connected with a cold re-steam extraction steam supply system in parallel and is connected into a water feeding pump steam turbine;
the auxiliary steam source steam supply system comprises a first auxiliary steam source steam supply pipeline and a second auxiliary steam source steam supply pipeline which are connected in parallel, the first auxiliary steam source steam supply pipeline is provided with an auxiliary steam source steam supply electric valve and an auxiliary steam source steam supply check valve, two ends of the second auxiliary steam source steam supply pipeline are respectively connected to two ends of the auxiliary steam source steam supply electric valve, and the second auxiliary steam source steam supply pipeline is sequentially provided with an auxiliary steam source steam supply bypass front manual valve, an auxiliary steam source steam supply bypass adjusting valve and an auxiliary steam source steam supply bypass adjusting rear electric valve;
and a third auxiliary steam source steam supply pipeline is connected between the auxiliary steam source steam supply bypass adjusting valve front manual door and the auxiliary steam source steam supply bypass adjusting valve, and a auxiliary steam source steam supply bypass adjusting valve front drainage temperature measuring point, an auxiliary steam source steam supply bypass adjusting valve front drainage manual door and an auxiliary steam source steam supply bypass adjusting valve front drainage pneumatic door are sequentially arranged on the third auxiliary steam source steam supply pipeline.
Furthermore, the other end of the third auxiliary steam source steam supply pipeline is connected into the drainage flash tank.
Further, the four-section steam extraction and supply system comprises a four-section steam extraction and supply pipeline, and a four-section steam extraction and supply check valve is arranged on the four-section steam extraction and supply pipeline; one end of the auxiliary steam source steam supply check valve is respectively connected with the auxiliary steam source steam supply electric valve and the auxiliary steam source steam supply bypass adjusting valve rear electric valve, and the other end of the auxiliary steam source steam supply check valve is combined with the four-section steam extraction steam supply check valve.
Further, the low-pressure steam source steam supply system comprises a low-pressure steam source steam supply pipeline, and the low-pressure steam source steam supply pipeline is sequentially provided with a low-pressure steam source steam supply electric valve and a low-pressure steam source steam supply check valve;
the two ends of the low-pressure steam source steam supply electric door are respectively provided with a first drain pipeline, and the first drain pipelines are sequentially provided with a low-pressure steam source steam supply electric door front and rear drain manual door and a low-pressure steam source steam supply electric door front and rear drain pneumatic door;
one end of the low-pressure steam source steam supply check valve is provided with a second drainage pipeline, and the second drainage pipeline is sequentially provided with a low-pressure steam source steam supply check valve rear drainage manual valve and a low-pressure steam source steam supply check valve rear drainage pneumatic valve.
Further, the cold re-extraction steam supply system comprises a cold re-extraction steam supply pipeline, and the cold re-extraction steam supply pipeline is sequentially provided with a cold re-extraction steam supply check valve, a cold re-extraction steam supply electric valve and a cold re-extraction steam supply high-pressure regulating valve;
a cold re-extraction steam supply check valve rear water drainage manual valve and a cold re-extraction steam supply check valve rear water drainage pneumatic valve which are sequentially connected are arranged between the cold re-extraction steam supply check valve and the cold re-extraction steam supply electric valve;
and a rear water drainage manual door of the cold re-steam extraction steam supply electric door and a rear water drainage pneumatic door of the cold re-steam extraction steam supply electric door which are sequentially connected are arranged between the cold re-steam extraction steam supply electric door and the cold re-steam extraction steam supply high-pressure regulating valve.
Furthermore, the low-pressure steam source steam supply check valve and the cold re-extraction steam supply high-pressure regulating valve are connected into a water-feeding pump steam turbine pipeline after confluence; and the water feeding pump turbine pipeline is sequentially provided with a main throttle valve of the water feeding pump turbine and a low-pressure regulating valve of the water feeding pump turbine.
Furthermore, a steam turbine main pipe temperature measuring point and a water pump steam turbine main pipe pressure measuring point are further arranged on the water pump steam turbine pipeline.
Furthermore, a steam discharge electric door of the water supply pump turbine is arranged at the exhaust end of the water supply pump turbine.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a steam supply system with stable pressure of a steam source of a feed pump steam turbine of a coal-fired power plant, which comprises a low-pressure steam source steam supply system, a four-section steam extraction steam supply system, an auxiliary steam source steam supply system and a cold re-extraction steam supply system; one end of the low-pressure steam source steam supply system is connected with an auxiliary steam source steam supply system and a four-section steam extraction steam supply system which are mutually connected in parallel, and the other end of the low-pressure steam source steam supply system is respectively connected with a cold re-steam extraction steam supply system in parallel and is connected into a water feeding pump steam turbine; the auxiliary steam source steam supply system comprises a first auxiliary steam source steam supply pipeline and a second auxiliary steam source steam supply pipeline which are connected in parallel, the first auxiliary steam source steam supply pipeline is provided with an auxiliary steam source steam supply electric door and an auxiliary steam source steam supply check valve, two ends of the second auxiliary steam source steam supply pipeline are respectively connected to two ends of the auxiliary steam source steam supply electric door, and the second auxiliary steam source steam supply pipeline is sequentially provided with an auxiliary steam source steam supply bypass regulating valve front manual door, an auxiliary steam source steam supply bypass regulating valve and an auxiliary steam source steam supply bypass regulating valve rear electric door; a third auxiliary steam source steam supply pipeline is connected between the auxiliary steam source steam supply bypass regulating valve front manual door and the auxiliary steam source steam supply bypass regulating valve, and an auxiliary steam source steam supply bypass regulating valve front drain temperature measuring point, an auxiliary steam source steam supply bypass regulating valve front drain manual door and an auxiliary steam source steam supply bypass regulating valve front drain pneumatic door are sequentially arranged on the third auxiliary steam source steam supply pipeline; the steam-driven water-feeding pump can maintain the pressure of the steam source of the steam-driven water-feeding pump to be always stable when the coal-fired unit operates in an ultra-low load state or during accident handling, so that the aim of stabilizing the water-feeding flow and ensuring the safety of the unit is fulfilled; meanwhile, the steam-driven water supply pump has an automatic pipe heating function, the speed of switching the steam source of the steam-driven water supply pump can be effectively increased, and the stability of the pressure of the steam source is ensured, so that the steam-driven water supply pump has good linear adjustment characteristics; this application adopts a large amount of accent valves that have the automatically regulated function to replace operation personnel manually operation, and degree of automation is high, and personnel's of operation amount when having the reduction unit incident processing has overcome personnel's manual adjustment untimely shortcoming not in place in time, and this application scheme is reasonable, and simple structure realizes easily that transformation cost is cheap.
Drawings
Fig. 1 is the utility model discloses a coal fired power plant's feed pump steam turbine steam source pressure stability's steam supply system structure sketch map.
In the figure: a cold re-extraction steam supply check valve 1, a cold re-extraction steam supply electric valve 2, a cold re-extraction steam supply high pressure regulating valve 3, a cold re-extraction steam supply check valve rear drain manual valve 4, a cold re-extraction steam supply check valve rear drain pneumatic valve 5, a cold re-extraction steam supply electric valve rear drain manual valve 6, a cold re-extraction steam supply electric valve rear drain pneumatic valve 7, a four-section steam supply check valve 8, a low pressure steam source steam supply electric valve 9, a low pressure steam source steam supply check valve 10, a low pressure steam source steam supply electric valve front and rear drain manual valve 11, a low pressure steam source steam supply electric valve front and rear drain pneumatic valve 12, a low pressure steam source steam supply check valve rear drain manual valve 13, a low-pressure steam source steam supply check valve rear drain pneumatic valve 14, a steam source steam supply electric valve 15, an auxiliary steam source steam supply check valve 16, an auxiliary steam source steam supply bypass adjusting valve front manual valve 17, an auxiliary steam source steam supply bypass adjusting valve 18, an auxiliary steam source steam supply bypass adjusting valve rear electric valve 19, an auxiliary steam source steam supply bypass adjusting valve front drain temperature measuring point 20, an auxiliary steam source steam supply bypass adjusting valve front drain manual valve 21, an auxiliary steam source steam supply bypass adjusting valve front drain pneumatic valve 22, a steam turbine steam supply main pipe temperature measuring point 23, a water supply turbine main pipe pressure measuring point 24, a water supply pump turbine main steam valve 25, a water supply pump turbine low-pressure adjusting valve 26 and a water supply pump turbine steam discharge electric valve 27.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are intended to be illustrative rather than restrictive.
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, article, or apparatus.
The utility model provides a steam supply system with stable pressure of a steam source of a water feeding pump steam turbine of a coal-fired power plant, which is characterized by comprising a low-pressure steam source steam supply system, a four-section steam extraction steam supply system, an auxiliary steam source steam supply system and a cold re-extraction steam supply system;
one end of the low-pressure steam source steam supply system is connected with an auxiliary steam source steam supply system and a four-section steam extraction steam supply system which are mutually connected in parallel, and the other end of the low-pressure steam source steam supply system is respectively connected with a cold re-steam extraction steam supply system in parallel and is connected into a water feeding pump steam turbine;
the auxiliary steam source steam supply system comprises a first auxiliary steam source steam supply pipeline and a second auxiliary steam source steam supply pipeline which are connected in parallel, the first auxiliary steam source steam supply pipeline is provided with an auxiliary steam source steam supply electric door 15 and an auxiliary steam source steam supply check valve 16, two ends of the second auxiliary steam source steam supply pipeline are respectively connected with two ends of the auxiliary steam source steam supply electric door 15, and the second auxiliary steam source steam supply pipeline is sequentially provided with an auxiliary steam source steam supply bypass adjusting valve front manual door 17, an auxiliary steam source steam supply bypass adjusting valve 18 and an auxiliary steam source steam supply bypass adjusting valve rear electric door 19;
a third auxiliary steam source steam supply pipeline is connected between the auxiliary steam source steam supply bypass adjusting valve front manual valve 17 and the auxiliary steam source steam supply bypass adjusting valve 18, and an auxiliary steam source steam supply bypass adjusting valve front drain temperature measuring point 20, an auxiliary steam source steam supply bypass adjusting valve front drain manual valve 21 and an auxiliary steam source steam supply bypass adjusting valve front drain pneumatic valve 22 are sequentially arranged on the third auxiliary steam source steam supply pipeline.
Preferably, the other end of the third auxiliary steam source steam supply pipeline is connected into the drainage flash tank.
Preferably, the four-section steam extraction and supply system comprises a four-section steam extraction and supply pipeline, and a four-section steam extraction and supply check valve 8 is arranged on the four-section steam extraction and supply pipeline; one end of the auxiliary steam source steam supply check valve 16 is respectively connected with the auxiliary steam source steam supply electric valve 15 and the auxiliary steam source steam supply bypass adjusting valve rear electric valve 19, and the other end of the auxiliary steam source steam supply check valve is converged with the four-section steam extraction steam supply check valve 8.
Preferably, the low-pressure steam source steam supply system comprises a low-pressure steam source steam supply pipeline, and the low-pressure steam source steam supply pipeline is sequentially provided with a low-pressure steam source steam supply electric valve 9 and a low-pressure steam source steam supply check valve 10;
the two ends of the low-pressure steam source steam supply electric door 9 are both provided with a first drain pipeline, and the first drain pipeline is sequentially provided with a low-pressure steam source steam supply electric door front and rear drain manual door 11 and a low-pressure steam source steam supply electric door front and rear drain pneumatic door 12;
one end of the low-pressure steam source steam supply check valve 10 is provided with a second drainage pipeline, and the second drainage pipeline is sequentially provided with a low-pressure steam source steam supply check valve rear drainage manual valve 13 and a low-pressure steam source steam supply check valve rear drainage pneumatic valve 14.
Further, the cold re-extraction steam supply system comprises a cold re-extraction steam supply pipeline, and the cold re-extraction steam supply pipeline is sequentially provided with a cold re-extraction steam supply check valve 1, a cold re-extraction steam supply electric valve 2 and a cold re-extraction steam supply high-pressure regulating valve 3;
a cold re-extraction steam supply check valve rear drainage manual valve 4 and a cold re-extraction steam supply check valve rear drainage pneumatic valve 5 which are sequentially connected are arranged between the cold re-extraction steam supply check valve 1 and the cold re-extraction steam supply electric valve 2;
and a cold re-steam extraction steam supply electric door rear drainage manual door 6 and a cold re-steam extraction steam supply electric door rear drainage pneumatic door 7 which are sequentially connected are arranged between the cold re-steam extraction steam supply electric door 2 and the cold re-steam extraction steam supply high-pressure regulating valve 3.
Further, the low-pressure steam source steam supply check valve 10 and the cold re-extraction steam supply high-pressure regulating valve 3 are converged and then are connected to a water supply pump steam turbine pipeline; the feed pump turbine pipeline is sequentially provided with a feed pump turbine main throttle 25 and a feed pump turbine low-pressure regulating valve 26.
Furthermore, a turbine steam supply main pipe temperature measuring point 23 and a feed pump turbine steam supply main pipe pressure measuring point 24 are further arranged on the feed pump turbine pipeline.
Preferably, the exhaust end of the feed water pump turbine is provided with a feed water pump turbine steam exhaust electric door 27.
The utility model provides a coal fired power plant's feed pump steam turbine steam source stable in pressure's steam supply system when using, including following step:
when the unit is started and stopped and the peak is deeply regulated, the pressure of the four-section steam extraction and supply system is reduced, and the auxiliary steam source and supply system is gradually switched to supply steam for the water feeding pump steam turbine; the auxiliary steam source steam supply electric valve 15 keeps closed, the manual valve 17 in front of the auxiliary steam source steam supply bypass regulating valve, the auxiliary steam source steam supply bypass regulating valve 18 and the electric valve 19 behind the auxiliary steam source steam supply bypass regulating valve keep open, and the auxiliary steam source steam supply bypass regulating valve 18 maintains the low-pressure steam source steam supply pressure of the water supply pump steam turbine; the method is used for realizing the quick and automatic switching of the low-pressure steam source of the water feeding pump steam turbine in the normal operation adjustment, so that the steam-driven water feeding pump has good linear adjustment characteristics.
When the unit meets RB and load sudden drop to cause the main steam pressure to be quickly thrown down, the pressure of the four-section steam extraction and supply system is quickly reduced, the auxiliary steam source steam supply bypass adjusting valve 18 maintains the stability of the low-pressure steam source steam supply pressure of the water supply pump turbine, the front drain pneumatic valve 22 of the auxiliary steam source steam supply bypass adjusting valve automatically opens to drain, and the low-pressure steam source of the water supply pump turbine is quickly switched from the four-section steam extraction and supply system to the auxiliary steam source steam supply system; the method is used for realizing the quick automatic switching of the low-pressure steam source of the water feeding pump steam turbine during the fault processing of the unit, and ensuring the stability of the water feeding flow.
The drain valve manual valve 21 before the auxiliary steam source steam supply bypass adjusting valve before the auxiliary steam source steam supply system supplies steam to the water pump steam turbine adjusting valve is kept in an open state, the drain valve temperature target threshold value is manually preset when the auxiliary steam source steam supply bypass adjusting valve pneumatic valve 22 is in an automatic mode, the drain valve is automatically closed when the temperature target threshold value is higher than the temperature target threshold value and is automatically opened when the temperature target threshold value is lower than the temperature target threshold value, the drain valve manual valve is used for ensuring that the auxiliary steam source steam supply system pipeline is always in a warm pipe standby state, and the water is prevented from entering the water pump steam turbine when the steam source is quickly switched;
when the unit is lower than 40% of rated load, the auxiliary steam source steam supply system supplies steam to the water feeding pump steam turbine; when the unit is more than 40% of rated load, the four-section steam extraction and supply system supplies steam to the water supply pump turbine;
the auxiliary steam source steam supply electric door 15 has the functions of stop and pulse operation and has the opening display. When the auxiliary steam source steam supply bypass adjusting valve 18 fails, the four-section steam extraction and supply system automatically supplies steam to the auxiliary steam source steam supply system through the stop and pulse of the auxiliary steam source steam supply electric door 15. The standby steam source switching measure is used as a normal steam source switching mode, and the safety of the unit is comprehensively guaranteed.
Further, the auxiliary steam source steam supply electric door 15 is connected with a DCS control system, and the steps of realizing stop and pulse include:
s1: the low-pressure steam source steam supply system supplies steam, and the front and rear water drainage hand-operated doors 11 and 13 of the low-pressure steam source steam supply electric door and the low-pressure steam source steam supply check valve are kept open; opening a front and rear water draining pneumatic door 12 of a low-pressure steam source steam supply electric door and a rear water draining pneumatic door 14 of a low-pressure steam source steam supply check valve;
s2: the DCS controls the steam supply electric door 15 of the auxiliary steam source in a pulse mode, so that the steam supply electric door 15 of the auxiliary steam source keeps a slightly opened state;
s3: if the temperatures of the first drainage pipeline and the second drainage pipeline are higher than 200 ℃, the output of a water feeding pump steam turbine is normal, and when the steam flow of the four-section steam extraction and supply system is reduced, the pulse auxiliary steam source steam supply electric door 15 is continuously spaced until the auxiliary steam source steam supply electric door 15 is fully opened;
s4: if the temperature of the first drain pipeline and the second drain pipeline is higher than 250 ℃, the front and rear drain pneumatic doors 12 of the low-pressure steam source steam supply electric door and the rear drain pneumatic door 14 of the low-pressure steam source steam supply check valve are closed.
Specifically, in the step S2, the DCS control system opens the pulse auxiliary steam source steam supply electric door 15;
the judging conditions in the step S3 specifically include:
a: confirming that the temperature of the drainage collecting pipe rises to more than 200 ℃;
b: confirming that the output normal abs (difference between the small machine rotating speed instruction and the actual rotating speed) of the water supply pump turbine is less than 50rpm; abs (difference between water supply flow command and actual flow) <50 KG/S).
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (8)
1. A steam supply system with stable steam source pressure of a water-feeding pump steam turbine of a coal-fired power plant is characterized by comprising a low-pressure steam source steam supply system, a four-section steam extraction steam supply system, an auxiliary steam source steam supply system and a cold re-extraction steam supply system;
one end of the low-pressure steam source steam supply system is connected with an auxiliary steam source steam supply system and a four-section steam extraction steam supply system which are mutually connected in parallel, and the other end of the low-pressure steam source steam supply system is respectively connected with a cold re-steam extraction steam supply system in parallel and is connected into a water feeding pump steam turbine;
the auxiliary steam source steam supply system comprises a first auxiliary steam source steam supply pipeline and a second auxiliary steam source steam supply pipeline which are connected in parallel, the first auxiliary steam source steam supply pipeline is provided with an auxiliary steam source steam supply electric door (15) and an auxiliary steam source steam supply check valve (16), two ends of the second auxiliary steam source steam supply pipeline are respectively connected with two ends of the auxiliary steam source steam supply electric door (15), and the second auxiliary steam source steam supply pipeline is sequentially provided with an auxiliary steam source steam supply bypass adjusting valve front manual door (17), an auxiliary steam source steam supply bypass adjusting valve (18) and an auxiliary steam source steam supply bypass adjusting valve rear electric door (19);
a third auxiliary steam source steam supply pipeline is connected between the auxiliary steam source steam supply bypass adjusting valve front manual door (17) and the auxiliary steam source steam supply bypass adjusting valve (18), and an auxiliary steam source steam supply bypass adjusting valve front drain temperature measuring point (20), an auxiliary steam source steam supply bypass adjusting valve front drain manual door (21) and an auxiliary steam source steam supply bypass adjusting valve front drain pneumatic door (22) are sequentially arranged on the third auxiliary steam source steam supply pipeline.
2. The steam supply system for stabilizing the pressure of the steam source of the feed pump steam turbine of the coal-fired power plant according to claim 1, wherein the other end of the steam supply pipeline of the third auxiliary steam source is connected into the drain flash tank.
3. The steam supply system with stable steam source pressure of the water feeding pump turbine of the coal-fired power plant as recited in claim 1, wherein the four-section steam extraction and supply system comprises a four-section steam extraction and supply pipeline, and a four-section steam extraction and supply check valve (8) is arranged on the four-section steam extraction and supply pipeline; one end of the auxiliary steam source steam supply check valve (16) is respectively connected with the auxiliary steam source steam supply electric valve (15) and the auxiliary steam source steam supply bypass adjusting valve rear electric valve (19), and the other end of the auxiliary steam source steam supply check valve is converged with the four-section steam extraction steam supply check valve (8).
4. The steam supply system with the stable steam source pressure of the water feeding pump steam turbine of the coal-fired power plant as recited in claim 1, wherein the low-pressure steam source steam supply system comprises a low-pressure steam source steam supply pipeline, and the low-pressure steam source steam supply pipeline is sequentially provided with a low-pressure steam source steam supply electric valve (9) and a low-pressure steam source steam supply check valve (10);
first drain pipelines are arranged at two ends of the low-pressure steam source steam supply electric door (9), and a low-pressure steam source steam supply electric door front and rear drain manual door (11) and a low-pressure steam source steam supply electric door front and rear drain pneumatic door (12) are sequentially arranged on the first drain pipelines;
one end of the low-pressure steam source steam supply check valve (10) is provided with a second drainage pipeline, and the second drainage pipeline is sequentially provided with a low-pressure steam source steam supply check valve rear drainage manual valve (13) and a low-pressure steam source steam supply check valve rear drainage pneumatic valve (14).
5. The steam supply system with the stable steam source pressure of the water feeding pump steam turbine of the coal-fired power plant as claimed in claim 4, characterized in that the cold re-extraction steam supply system comprises a cold re-extraction steam supply pipeline, and the cold re-extraction steam supply pipeline is sequentially provided with a cold re-extraction steam supply check valve (1), a cold re-extraction steam supply electric valve (2) and a cold re-extraction steam supply high-pressure regulating valve (3);
a cold re-extraction steam supply check valve rear drainage manual valve (4) and a cold re-extraction steam supply check valve rear drainage pneumatic valve (5) which are sequentially connected are arranged between the cold re-extraction steam supply check valve (1) and the cold re-extraction steam supply electric valve (2);
and a cold re-extraction steam supply electric door rear drainage manual door (6) and a cold re-extraction steam supply electric door rear drainage pneumatic door (7) which are sequentially connected are arranged between the cold re-extraction steam supply electric door (2) and the cold re-extraction steam supply high-pressure regulating valve (3).
6. The steam supply system with stable steam source pressure of the water feeding pump steam turbine of the coal-fired power plant as recited in claim 5, characterized in that the low-pressure steam source steam supply check valve (10) and the cold re-extraction steam supply high-pressure regulating valve (3) are connected into a water feeding pump steam turbine pipeline after confluence; and the feed pump turbine pipeline is sequentially provided with a feed pump turbine main throttle (25) and a feed pump turbine low-pressure regulating valve (26).
7. The steam supply system with stable steam source pressure of the water supply pump turbine of the coal-fired power plant as recited in claim 5, characterized in that the water supply pump turbine pipeline is further provided with a turbine steam supply main pipe temperature measuring point (23) and a water supply pump turbine steam supply main pipe pressure measuring point (24).
8. The steam supply system with stable steam source pressure of the feed pump turbine of the coal-fired power plant according to claim 1, characterized in that the exhaust end of the feed pump turbine is provided with a discharge electric door (27) of the feed pump turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222310101.1U CN217872943U (en) | 2022-08-31 | 2022-08-31 | Steam supply system with stable steam source pressure of water supply pump steam turbine of coal-fired power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222310101.1U CN217872943U (en) | 2022-08-31 | 2022-08-31 | Steam supply system with stable steam source pressure of water supply pump steam turbine of coal-fired power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217872943U true CN217872943U (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222310101.1U Active CN217872943U (en) | 2022-08-31 | 2022-08-31 | Steam supply system with stable steam source pressure of water supply pump steam turbine of coal-fired power plant |
Country Status (1)
| Country | Link |
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| CN (1) | CN217872943U (en) |
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2022
- 2022-08-31 CN CN202222310101.1U patent/CN217872943U/en active Active
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