CN206786697U - Feedwater recirculating system - Google Patents
Feedwater recirculating system Download PDFInfo
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- CN206786697U CN206786697U CN201720539252.0U CN201720539252U CN206786697U CN 206786697 U CN206786697 U CN 206786697U CN 201720539252 U CN201720539252 U CN 201720539252U CN 206786697 U CN206786697 U CN 206786697U
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- electrically driven
- outlet
- feedwater
- feed pump
- oxygen
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Abstract
It the utility model is related to boiler feedwater technical field, there is provided a kind of feedwater recirculating system, including oxygen-eliminating device, electrically driven feed pump, the boiler being sequentially communicated；Also include minimum flow regulating valve, check-valves；The import of minimum flow regulating valve and the outlet of motor water pump；The outlet of minimum flow regulating valve and the inlet communication of check-valves；The outlet of check-valves and the inlet communication of oxygen-eliminating device；The entrance of oxygen-eliminating device is provided with throttling arrangement；The entrance of electrically driven feed pump is provided with flow measurement device.When flow is smaller in electrically driven feed pump, minimum flow regulating valve is opened, feedwater is sent into oxygen-eliminating device to maintain flow certain in electrically driven feed pump, prevents electrically driven feed pump from cavitation phenomenons occur；By setting throttling arrangement, make the pressure difference before and after minimum flow regulating valve substantially zeroed, avoid liquid of the valve element of check-valves under High Pressure Difference and wash away, reduce damage of the High Pressure Difference to valve, further prevent electrically driven feed pump from cavitation phenomenons occur.
Description
Technical field
Boiler feedwater technical field is the utility model is related to, more particularly to a kind of feedwater recirculating system.
Background technology
In steam generator system, electrically driven feed pump can have in oxygen-eliminating device certain temperature except the water of peroxide, after adherence pressure
It is transported in boiler, to meet the needs of boiler feed water.The pressure of electrically driven feed pump outlet is except the work of oxygen-eliminating device to be overcome
Outside pressure, supply line and electrically driven feed pump is also overcome to be exported to the static pressure difference that the difference in height of oxygen-eliminating device is formed, it is generally electronic
The outlet pressure of feed pump is significantly larger than the operating pressure of oxygen-eliminating device.It is electronic in order to reduce the volume and weight of electrically driven feed pump
The rotating speed of feed pump is generally very high.When boiler carries out the water pressure test after filling up water, or boiler is in a stove, blowing out moisturizing,
The flow of electrically driven feed pump rubbed with regard to very little, when now the impeller of electrically driven feed pump rotates at a high speed with water caused by heat be possible to
Make water vapor and cause feed pump to be evacuated, not only electrically driven feed pump cisco unity malfunction, and be likely to cause electronic feedwater
The damage of impeller of pump, electrically driven feed pump bite is caused when serious, bring hidden trouble for thermal power generation unit normal operation, easily
Cause serious financial consequences or other association accidents.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of feedwater recirculating system, can effectively prevent due to electricity
Flow is too low and cause the phenomenon of electrically driven feed pump cavitation in dynamic feed pump.
Technical scheme is used by the utility model solves its technical problem：Feedwater recirculating system, including oxygen-eliminating device,
Electrically driven feed pump, boiler；The oxygen-eliminating device has feedwater outlet and feed-water inlet；The electrically driven feed pump have the first import,
First outlet and second outlet；The feedwater outlet and first inlet communication；The second outlet is entered with the boiler
Mouth connection；Also include minimum flow regulating valve, check-valves；The import of the minimum flow regulating valve connects with the first outlet
It is logical；The outlet of the minimum flow regulating valve and the inlet communication of the check-valves；The outlet of the check-valves and the deoxygenation
The feed-water inlet connection of device；Throttling arrangement is provided with the feed-water inlet of the oxygen-eliminating device；The first of the electrically driven feed pump enters
Flow measurement device is provided with mouthful.
Further, the throttling arrangement is the restricting orifice for being arranged on the deaerator feedwater entrance.
Further, it is provided between the feedwater outlet of the oxygen-eliminating device and the first import of the electrically driven feed pump preposition
Pump.
Further, it is provided with filter between the feedwater outlet of the oxygen-eliminating device and the fore pump；The filtering
Device includes filter and the differential pressure warning device being separately positioned on before and after filter.
Further, connected on the pipeline between the feedwater outlet of the oxygen-eliminating device and the filter by safety corridor
It is connected to safety valve.
Further, on the pipeline between the first outlet of the electrically driven feed pump and the minimum flow regulating valve also according to
It is secondary to be provided with hand sluice valve and pneumatic control valve.
Further, connected on the pipeline between the electrically driven feed pump and the minimum flow regulating valve by exhausting pipeline
It is connected to atmospheric valve.
The beneficial effects of the utility model are：1st, by setting minimum flow regulating valve and check-valves, electrically driven feed pump is worked as
When middle flow is smaller, the minimum flow regulating valve is opened, feedwater is sent into oxygen-eliminating device to maintain stream certain in electrically driven feed pump
Amount, prevents electrically driven feed pump from cavitation phenomenons occur；2nd, by setting throttling arrangement, the pressure difference base before and after minimum flow regulating valve is made
Originally it is zero, avoids liquid of the valve element of check-valves under High Pressure Difference and wash away, damage of the High Pressure Difference to valve is reduced, so as to protect
The flow in electrically driven feed pump has been demonstrate,proved, has further prevented electrically driven feed pump from cavitation phenomenons occur.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of feedwater recirculating system of the present utility model.
Reference is in figure：1- oxygen-eliminating devices, 2- electrically driven feed pumps, 3- feedwater outlets, 4- feed-water inlets, 5- first enter
Mouthful, 6- first outlets, 7- second outlets, 8- minimum flow regulating valves, 9- check-valves, 10- throttling arrangements, 11- flow measurements dress
Put, 12- fore pumps, 13- filters, 14- differential pressure warning devices, 15- safety valves, 16- hand sluice valves, 17- pneumatic control valves,
18- exhausting pipelines, 19- atmospheric valves, 20- safety corridors, 21- electric gate valves, 22- boilers.
Embodiment
The utility model is described further with reference to the accompanying drawings and examples：
As shown in figure 1, feedwater recirculating system described in the utility model, including oxygen-eliminating device 1, electrically driven feed pump 2, boiler
22；The oxygen-eliminating device 1 has feedwater outlet 3 and feed-water inlet 4；The electrically driven feed pump 2 has the first import 5, first outlet 6
With second outlet 7；The feedwater outlet 3 connects with first import 5；The second outlet 7 and the import of the boiler 22
Connection；Also include minimum flow regulating valve 8, check-valves 9；The import of the minimum flow regulating valve 8 connects with the first outlet 6
It is logical；The outlet of the minimum flow regulating valve 8 and the inlet communication of the check-valves 9；Removed with described the outlet of the check-valves 9
The feed-water inlet 4 of oxygen device 1 connects；Throttling arrangement 10 is provided with the feed-water inlet 4 of the oxygen-eliminating device 1；The electrically driven feed pump 2
The first import 5 at be provided with flow measurement device 11.
Oxygen-eliminating device 1 is a kind of deaerating plant, and it can remove the dissolved oxygen and other gases in system feedwater, prevent to boiler
The corrosion of the equipment such as 22, it is the visual plant for ensureing thermal power plant's safe operation.The second outlet 7 of electrically driven feed pump 2 and boiler 22
Connection, by electrically driven feed pump 2, except the feedwater of peroxide, it will can be transported in oxygen-eliminating device 1 after improving pressure in boiler 22, with
Meet the needs of the water of boiler 22.Minimum flow regulating valve 8 is a kind of electric control valve, passes through electric operator energy thereon
Automatically being turned on and off for the minimum flow regulating valve 8 is realized.Check-valves 9 is a kind of valve of one-way flow, when electronic feedwater
When pump 2 is stopped or carries out tubular service, it can effectively prevent the medium in pipeline from flowing backwards.During work, electrically driven feed pump 2 will
It is pipelined to after feedwater adherence pressure in oxygen-eliminating device 1 in boiler 22；When being arranged on the import 5 of electrically driven feed pump 2 first
The flow measurement device 11 at place monitors that the flow in electrically driven feed pump 2 is less than the flow value being set in flow measurement device 11
When, signal is transferred to minimum flow regulating valve 8, minimum flow regulating valve by the signal conveyer on the flow measurement device 11
8 open, and electrically driven feed pump 2 is passed sequentially through first outlet 6, minimum flow regulating valve 8, check-valves 9, throttling arrangement 10 will feed water
It is transported in oxygen-eliminating device 1, ensures there are enough flows in electrically driven feed pump 2, avoid electrically driven feed pump 2 from cavitation phenomenons occur.
The throttling arrangement 10 is that a kind of device in pipeline is flowed through in the fluid full of pipeline, and fluid is formed at throttling
Local contraction, so that rate of flow of fluid increases, static pressure declines.By setting throttling arrangement 10, before making minimum flow regulating valve 8
Pressure differential afterwards is substantially zeroed, i.e., is not changed, ensure that from throttling by the pressure of the fluid after minimum flow regulating valve 8
Device 10 arrives the stabilization of fluids within pipes between minimum flow regulating valve 8, ensure that the safety for the check-valves 9 for being arranged on the position
Operation.If it is not provided with throttling arrangement 10, then very high pressure difference can be formed before and after minimum flow regulating valve 8, will now be led
Fluid of the cause minimum flow regulating valve 8 below in pipeline is extremely unstable, and flash distillation occurs in fluid, causes occur vapour-liquid two in pipeline
Phase fluid, it is unstable due to fluid, it will to cause the valve element of check-valves 9 not stop to stir up and down, or even cause valve element and valve body
Constantly collision, under this operating mode long-play so that the valve element fatigue damage of check-valves 9 and come off, cause line clogging, most
Make the flow of fluid in electrically driven feed pump 2 too small eventually, and cause occur cavitation phenomenons in electrically driven feed pump 2, severe patient causes electricity
The damage of dynamic feed pump 2.
The throttling arrangement 10 can be Venturi nozzle, long-radius nozzle etc., preferred scheme, the throttling arrangement 10
For the restricting orifice being arranged at the feed-water inlet of oxygen-eliminating device 1.The restricting orifice is given by flange arrangement and oxygen-eliminating device 1
Water inlet 3 connects, compared with other throttling arrangements 10, the restricting orifice have it is easy for installation, it is simple in construction, it is cheap etc. excellent
Point.
To improve economy of the oxygen-eliminating device 1 in sliding pressure operation, while the safe operation of electrically driven feed pump 2 is also ensured that, institute
State and be provided with fore pump 12 between the first import 5 of the feedwater outlet 3 and the electrically driven feed pump 2 of oxygen-eliminating device 1.Given due to electronic
Water temperature at the import 5 of water pump 2 first is severe close to the saturation temperature under manifold pressure, condition of work, it is easy to vaporizes,
And after vaporizing liquid, it will make electrically driven feed pump 2 that cavitation occur, to ensure the safe operation of electrically driven feed pump 2, fore pump is set
12, the rotating speed of fore pump 12 is relatively low, and anti-cavitation performance is good, so as to reduce the setting height(from bottom) of oxygen-eliminating device 1.Meanwhile fore pump 12
Feedwater can be pressurized, after the feedwater after supercharging enters electrically driven feed pump 2, ensure that enough cavitations needed for electrically driven feed pump 2
Surplus, so as to substantially improve the anti-cavitation performance of electrically driven feed pump 2.
For ease of being overhauled to feedwater recirculating system, the connection of the oxygen-eliminating device 1 and the system, the deoxygenation are cut off
Electric gate valve 21 is connected with the feedwater outlet 3 of device 1.
To prevent debris from entering electrically driven feed pump 2, set between the feedwater outlet 3 and the fore pump 12 of the oxygen-eliminating device 1
It is equipped with filter.The filter includes filter 13 and the differential pressure warning device being separately positioned on before and after filter 13
14.By setting filter 13 to be filtered the debris in pipeline；By setting differential pressure warning device 14, before filter 13
When pressure differential afterwards is larger, the differential pressure warning device 14 is alarmed, and reminds staff to clear up in time filter 13, to protect
Demonstrate,prove the safe operation of pipeline.
To prevent the debris on filter 13 from can not clear up in time, and the pressure in pipeline is caused to exceed the maximum in pipeline
Operating pressure, it is connected with by safety corridor 20 on the pipeline between the feedwater outlet 3 and the filter of the oxygen-eliminating device 1
Safety valve 15.When the pressure in pipeline exceedes the set-pressure of safety valve 15, safety valve 15 is opened, and the fluid in pipeline is arranged
Enter outside pipeline, to reduce the pressure in pipeline, avoid the generation of security incident.
For the further pressure followed again in bad system of regulation feedwater, the first outlet 6 of the electrically driven feed pump 2 with it is described most
Hand sluice valve 16 and pneumatic control valve 17 are also disposed with pipeline between control valve for small flows 8.Pass through pneumatic control valve
17 can carry out Primary regulation to the pressure of fluids within pipes；By setting hand sluice valve 16, when preventing that pneumatic control valve 17 from failing,
Pipeline can be adjusted using manual mode.
After being overhauled to feedwater recirculating system, before activation system, it is necessary in the duct full of water, it is ensured that start system
Relevant device and pipeline do not vibrate after system；Due to field pipes, to have height to have low, to ensure to be full of water, the electronic feedwater in pipeline
Atmospheric valve 19 is connected with by exhausting pipeline 18 on pipeline between pump 2 and the minimum flow regulating valve 8.It is vented by setting
Pipeline 18 and atmospheric valve 19, when carrying out water-filling to pipeline, the air in pipeline can be discharged by atmospheric valve 19.
Claims (7)
1. feedwater recirculating system, including oxygen-eliminating device (1), electrically driven feed pump (2), boiler (22)；The oxygen-eliminating device (1), which has, gives
Water out (3) and feed-water inlet (4)；The electrically driven feed pump (2) has the first import (5), first outlet (6) and second outlet
(7)；The feedwater outlet (3) connects with first import (5)；The second outlet (7) and the import of the boiler (22)
Connection；It is characterized in that：Also include minimum flow regulating valve (8), check-valves (9)；The import of the minimum flow regulating valve (8)
Connected with the first outlet (6)；The outlet of the minimum flow regulating valve (8) and the inlet communication of the check-valves (9)；Institute
The outlet of check-valves (9) is stated to connect with the feed-water inlet (4) of the oxygen-eliminating device (1)；The feed-water inlet (4) of the oxygen-eliminating device (1)
Place is provided with throttling arrangement (10)；The first import (5) place of the electrically driven feed pump (2) is provided with flow measurement device (11).
2. feedwater recirculating system according to claim 1, it is characterised in that：The throttling arrangement (10) is is arranged on
State the restricting orifice at oxygen-eliminating device (1) feed-water inlet.
3. feedwater recirculating system according to claim 1 or 2, it is characterised in that：The feedwater outlet of the oxygen-eliminating device (1)
(3) fore pump (12) is provided between the first import (5) of the electrically driven feed pump (2).
4. feedwater recirculating system according to claim 3, it is characterised in that：The feedwater outlet (3) of the oxygen-eliminating device (1)
Filter is provided between the fore pump (12)；The filter includes filter (13) and was separately positioned on
Differential pressure warning device (14) before and after filter (13).
5. feedwater recirculating system according to claim 4, it is characterised in that：The feedwater outlet (3) of the oxygen-eliminating device (1)
Safety valve (15) is connected with by safety corridor (20) on pipeline between the filter.
6. feedwater recirculating system according to claim 1 or 2, it is characterised in that：The first of the electrically driven feed pump (2)
Hand sluice valve (16) and pneumatic regulation are also disposed with pipeline between outlet (6) and the minimum flow regulating valve (8)
Valve (17).
7. feedwater recirculating system according to claim 1 or 2, it is characterised in that：The electrically driven feed pump (2) and described
Atmospheric valve (19) is connected with by exhausting pipeline (18) on pipeline between minimum flow regulating valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720539252.0U CN206786697U (en) | 2017-05-15 | 2017-05-15 | Feedwater recirculating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720539252.0U CN206786697U (en) | 2017-05-15 | 2017-05-15 | Feedwater recirculating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206786697U true CN206786697U (en) | 2017-12-22 |
Family
ID=60711481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720539252.0U Expired - Fee Related CN206786697U (en) | 2017-05-15 | 2017-05-15 | Feedwater recirculating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206786697U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180465A (en) * | 2018-02-10 | 2018-06-19 | 西安西热节能技术有限公司 | A kind of preposition pump control system of feed pump |
| CN108591041A (en) * | 2018-07-06 | 2018-09-28 | 华能国际电力股份有限公司 | Minimum Flowrate of Feed Pump recycle valve control system and method |
| CN110397909A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | Water supply feedforward control system and method based on feed pump recycle valve state |
| CN111594460A (en) * | 2020-06-12 | 2020-08-28 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
-
2017
- 2017-05-15 CN CN201720539252.0U patent/CN206786697U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180465A (en) * | 2018-02-10 | 2018-06-19 | 西安西热节能技术有限公司 | A kind of preposition pump control system of feed pump |
| CN108180465B (en) * | 2018-02-10 | 2024-05-28 | 西安西热节能技术有限公司 | Front-mounted pump control system of water feed pump |
| CN108591041A (en) * | 2018-07-06 | 2018-09-28 | 华能国际电力股份有限公司 | Minimum Flowrate of Feed Pump recycle valve control system and method |
| CN108591041B (en) * | 2018-07-06 | 2023-05-26 | 华能国际电力股份有限公司 | Minimum flow recirculation valve control system and method for feed pump |
| CN110397909A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | Water supply feedforward control system and method based on feed pump recycle valve state |
| CN111594460A (en) * | 2020-06-12 | 2020-08-28 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
| CN111594460B (en) * | 2020-06-12 | 2022-04-15 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 250014 Building No. 5, district three, Han Yu financial business center, Ji'nan, Shandong Patentee after: China Power Construction Group Shandong Electric Power Construction Co.,Ltd. Address before: 250000, No. ten, No. 10567, Ji'nan, Shandong Patentee before: SEPCO ELECTRIC POWER CONSTRUCTION Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171222 |