CN204285436U - A kind of Subcritical Units is without electric pump feedwater flow control system - Google Patents
A kind of Subcritical Units is without electric pump feedwater flow control system Download PDFInfo
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- CN204285436U CN204285436U CN201420727106.7U CN201420727106U CN204285436U CN 204285436 U CN204285436 U CN 204285436U CN 201420727106 U CN201420727106 U CN 201420727106U CN 204285436 U CN204285436 U CN 204285436U
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- flow control
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- driven valve
- control circuit
- supply line
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Abstract
The utility model provides a kind of Subcritical Units without electric pump feedwater flow control system, comprise steam-operating supply line, high-pressure heater, boiler water filling motor-driven valve, economizer and the flowmeter of connecting successively, steam-operating supply line comprises vapour front pump, the pneumatic pump of connecting successively, the two ends of described boiler water filling motor-driven valve are parallel with flow control circuit, and described flow control circuit is provided with the 6th motor-driven valve.When Subcritical Units just starts, adopt the feedwater of vapour front pump, because vapour front pump can not control flow, the pressure that boiler water filling motor-driven valve can be caused to bear is excessive, upper water flow velocity is too fast, the utility model adopts flow control circuit can alleviate boiler water filling motor-driven valve pressure, and the upper water speed of accurate control, to meet the upper water time rule of power industry.
Description
Technical field
The utility model belongs to fired power generating unit subcritical drum feedwater field, especially relates to a kind of Subcritical Units without electric pump flow control system.
Background technology
Along with the increase of generating set capacity and improving constantly of parameter, the control of unit and operational management become and become increasingly complex and difficulty.In order to alleviate the labour intensity of operations staff, ensure the safe operation of unit, require that realization is more advanced, the scope of application is wider, the automatic control system that function is more complete, this generates whole-process control system.And feed water control system has very important effect in power plant runs.
Subcritical Units start-up without motor-driving pump method is at Initial Stage after Ignition, because evaporation capacity is little, confluent is also relatively little, water supplying pump before vapour in employing steam-operating supply line, when pressure reaches between 0.6-0.8Mpa in drum, open pneumatic pump, according to the progressively rising value of boiler main steam, reheated steam parameter, control the corresponding rotating speed of steam feed pump, eventually to boiler-steam dome normal water supply.
Economizer and water-cooling wall must be filled water before the igniting of subcritical drum boiler, drum moisturizing to certain altitude, and sets up water circulation, prevent economizer, water-cooling wall can not get effective cooling after ignition of the boiler, tube wall temperature transfinites generation booster.According to power industry regulation, strictly control water speed during boiler water filling, on summer, the water time is no less than 2 hours, and on winter, the water time is no less than 4 hours, to reduce drum metal fever stress.Because boiler vapour front pump is electrodynamic pump, only pump operation before vapour during boiler steam-driven, so can not control water speed accurately.
Utility model content
The purpose of this utility model is to provide a kind of Subcritical Units without electric pump feedwater flow control system, can control water speed accurately, to meet the upper water time rule of power industry by this water flow control system when adopting start-up without motor-driving pump.
The technical solution of the utility model is: a kind of Subcritical Units is without electric pump feedwater flow control system, comprise steam-operating supply line, high-pressure heater, boiler water filling motor-driven valve, economizer and the flowmeter of connecting successively, steam-operating supply line comprises vapour front pump, the pneumatic pump of connecting successively, the two ends of described boiler water filling motor-driven valve are parallel with flow control circuit, and described flow control circuit is provided with the 6th motor-driven valve.
During boiler bag employing start-up without motor-driving pump, only open vapour front pump, because vapour front pump is electrodynamic pump, automatically can not regulate flow velocity, so there will be the too fast situation of water, can not meet the upper water time rule of power industry.Adopt boiler water filling motor-driven valve to control upper water speed, when water flow pressure is excessive, easily will causes damage to boiler water filling motor-driven valve, well can not control water speed.The utility model is a flow control circuit in parallel at the two ends of boiler water filling motor-driven valve, the part water in boiler water filling motor-driven valve downstream is made to be back to the upstream of boiler water filling motor-driven valve by flow control circuit, decrease the flow of the water entering economizer, alleviate the pressure that boiler water filling motor-driven valve bears.
Described flow control circuit is also provided with the first non-return valve.
Described flow control circuit is provided with two the first non-return valves, and described two the first non-return valves are separately positioned on the both sides of the 6th motor-driven valve.
One end of described flow control circuit is connected on the pipeline between boiler water filling motor-driven valve and economizer, the other end of described flow control circuit is connected on the pipeline between boiler water filling motor-driven valve and high-pressure heater, described flow control circuit is provided with water storage box, and described water storage box is arranged on the pipeline between the first non-return valve and the flow control circuit other end.
Flow control circuit is provided with water storage box, can improve the regulating power of flow control circuit, by regulating the aperture of the 6th motor-driven valve and boiler water filling motor-driven valve, is stored in water storage box when upper water speed is too fast by part water, reduces upper water flow velocity further.
The height of described water storage box lower than the height of flow control circuit one end, higher than the height of the flow control circuit other end.
When upper water flow velocity is too fast, water storage box can be used for storing the water in flow control circuit, and when upper water flow velocity is mild, the water in water storage box can be entered in economizer by boiler water filling motor-driven valve again by Action of Gravity Field.
Subcritical Units also comprises oxygen-eliminating device and deoxygenation water tank without electric pump feedwater flow control system, be connected with steam-operating supply line after the series connection of described oxygen-eliminating device, deoxygenation water tank, described steam-operating supply line is also provided with the first motor-driven valve and the second non-return valve, described first motor-driven valve is arranged on the pipeline between deoxygenation water tank and vapour front pump, and described second non-return valve is arranged on the pipeline between pneumatic pump and high-pressure heater.
Described steam-operating supply line is also provided with the second motor-driven valve, and described second motor-driven valve is arranged on the pipeline between the second non-return valve and high-pressure heater.
The utility model can be provided with two steam-operating supply lines in parallel simultaneously to boiler water supply.
Described Subcritical Units also comprises electronic supply line without electric pump feedwater flow control system, described electronic supply line and steam-operating supply line are arranged in parallel between oxygen-eliminating device and high-pressure heater, described electronic supply line are in series with successively the 5th motor-driven valve, electrodynamic pump, the 3rd non-return valve and the 3rd motor-driven valve.
Steam-operating supply line break down or air failure time, electronic supply line can be adopted to supply water to boiler-steam dome.
Described electronic supply line is provided with bypass, and the two ends of described bypass are connected in parallel on the two ends of the 3rd motor-driven valve respectively, and described bypass is provided with the 4th motor-driven valve.
Adopt electrodynamic pump in electronic supply line, regulate flow velocity by means of only the 3rd motor-driven valve, so the pressure that the 3rd motor-driven valve bears is comparatively large, easily damage.The present invention is a bypass in parallel at the two ends of the 3rd motor-driven valve, when the 3rd motor-driven valve breaks down, the 3rd motor-driven valve can cut out, regulate flow velocity by bypass.
Described bypass is also provided with two the first hand-operated valves, described first hand-operated valve is separately positioned on the two ends of the 3rd motor-driven valve.
Because the 4th motor-driven valve is sensor, easily damage.4th motor-driven valve is installed between two the first hand-operated valves, facilitates the maintenance of the 4th motor-driven valve.
The advantage that the utility model has and good effect are: owing to adopting technique scheme, water speed can be controlled accurately when adopting start-up without motor-driving pump, to meet the upper water time rule of power industry, there is structure simple, easy to maintenance, the advantages such as processing cost is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model
In figure:
1, oxygen-eliminating device 2, deoxygenation water tank 3, first motor-driven valve 4, vapour front pump 5, pneumatic pump
6, the first non-return valve 7, second motor-driven valve 8, electrodynamic pump 9, filter 10, the 3rd motor-driven valve
11, the first hand-operated valve 12, the 4th motor-driven valve 13, the 5th motor-driven valve 14, high-pressure heater 15, boiler water filling motor-driven valve
16, water storage box 17, the 6th motor-driven valve 18, economizer 19, flowmeter 20, boiler-steam dome
21, the second non-return valve 22, the 3rd non-return valve
Detailed description of the invention
As shown in Figure 1, a kind of Subcritical Units of the utility model is without electric pump feedwater flow control system, comprise the steam-operating supply line of connecting successively, high-pressure heater 14, boiler water filling motor-driven valve 15, economizer 18 and flowmeter 19, steam-operating supply line comprises the vapour front pump 4 of connecting successively, pneumatic pump 5, the two ends of boiler water filling motor-driven valve 15 are parallel with flow control circuit, one end of flow control circuit is connected on the pipeline between boiler water filling motor-driven valve 15 and economizer 18, the other end of flow control circuit is connected on the pipeline between boiler water filling motor-driven valve 15 and high-pressure heater 14, flow control circuit is provided with the 6th motor-driven valve 17.Open the pressure that the 6th motor-driven valve 17 can alleviate boiler water filling motor-driven valve 15, the part water in boiler water filling motor-driven valve 15 downstream is back in the pipeline of boiler water filling motor-driven valve 15 upstream by flow control circuit.Such boiler water filling motor-driven valve 15 just need not bear larger water flow pressure, prevents that hydraulic pressure is excessive to cause damage to boiler water filling motor-driven valve 15.
Flow control circuit also can be provided with the first non-return valve 6 for preventing aqueous reflux.Flow control circuit can be provided with the both sides that two the first non-return valves, 6, two the first non-return valves 6 are separately positioned on the 6th motor-driven valve 17.
Flow control circuit can also be provided with water storage box 16, and water storage box 16 is arranged on the pipeline between the first non-return valve 6 and the flow control circuit other end.Namely flow control circuit is in series with the first non-return valve 6, the 6th motor-driven valve 17, first non-return valve 6 and water storage box 16 successively.Can storage compartment water in water storage box 16, after preventing the water circulation in flow control circuit, upper water speed becomes large.Such flow control circuit not only can alleviate the pressure of boiler water filling motor-driven valve 15, can also reduce upper water speed further, to meet the upper water time rule of power industry.The height of water storage box 16 lower than the height of flow control circuit one end, higher than the height of the flow control circuit other end.When boiler water filling motor-driven valve 15 pressure can be made so little, the water in water storage box 16 can be flowed in economizer by boiler water filling motor-driven valve 15 automatically in gravitate impact.
Subcritical Units can also comprise oxygen-eliminating device 1 and deoxygenation water tank 2 without electric pump feedwater flow control system, oxygen-eliminating device 1, deoxygenation water tank 2 are connected with steam-operating supply line after connecting, steam-operating supply line is also provided with the first motor-driven valve 3 and the second non-return valve 21, first motor-driven valve 3 is arranged on the pipeline between deoxygenation water tank 2 and vapour front pump 4, and the second non-return valve 21 is arranged on the pipeline between pneumatic pump 5 and high-pressure heater 14.Namely be in series with the first motor-driven valve 3, vapour front pump 4, pneumatic pump 5, second non-return valve 21 in steam-operating supply line successively.Also can be provided with the second motor-driven valve 7, second motor-driven valve 7 to be arranged on the pipeline between the second non-return valve 21 and high-pressure heater 14 in the downstream of the second non-return valve 21.All right mounting filter 9 and flowmeter 19 in steam-operating supply line, filter 9 is arranged on the two ends of vapour front pump 4, and flowmeter 19 is arranged between vapour front pump 4 and pneumatic pump 5, for detecting the discharge of whole steam-operating supply line.First motor-driven valve 3 and the second motor-driven valve 7 are for controlling the switch of whole steam-operating supply line, and the first motor-driven valve 3 and the second motor-driven valve 7 all should be opened, then open vapour front pump 4 before starting by vapour front pump 4.Can further water flow velocity on fine adjustment by the first motor-driven valve 3 and the second motor-driven valve 7.
Can multiple steam-operating supply line in parallel on the pipeline between deoxygenation water tank 2 with high-pressure heater 14, preferably two steam-operating supply line parallel connections just can meet the requirements of water on boiler-steam dome 20.An electronic supply line in parallel with steam-operating supply line can also be provided with between deoxygenation water tank 2 and high-pressure heater 14, electronic supply line be in series with successively the 5th motor-driven valve 13, electrodynamic pump 8, the 3rd non-return valve 22 and the 3rd motor-driven valve 10.Electronic supply line can be opened when the source of the gas of steam-operating supply line or pneumatic pump 5 breaks down to supply water to boiler-steam dome 20.Before electrodynamic pump 8 starts, should in advance the 5th motor-driven valve 13 and the 3rd motor-driven valve 10 be opened.The discharge of electronic supply line is regulated by the 5th motor-driven valve 13 and the 3rd motor-driven valve 10.Because electrodynamic pump 8 lift and pressure are comparatively large, so the pressure that the 3rd motor-driven valve 10 bears is also comparatively large, easily causes damage, so bypass can be provided with in the two ends parallel connection of the 3rd motor-driven valve 10, bypass is provided with the 4th motor-driven valve 12.When the 3rd motor-driven valve 10 breaks down, regulating water flow can be carried out by the 4th motor-driven valve 12.Bypass is also provided with the two ends that two the first hand-operated valve 11, first hand-operated valves 11 are separately positioned on the 3rd motor-driven valve 12.4th motor-driven valve 12 is installed between two the first hand-operated valves 11, facilitate the maintenance of the 4th motor-driven valve 12.
The course of work of this example: when boiler-steam dome 20 starts, first to opening the first motor-driven valve, the second motor-driven valve and boiler water filling motor-driven valve, then vapour front pump 4 is started, when flowmeter 19 detects that upper water speed is too fast, 6th motor-driven valve 17 is opened, alleviates the pressure that boiler water filling motor-driven valve 15 bears.When pressure reaches between 0.6-0.8Mpa in boiler-steam dome 20, close the 6th motor-driven valve 17, open pneumatic pump 5, according to the progressively rising value of boiler main steam, reheated steam parameter, control the corresponding rotating speed of pneumatic pump 5, eventually to boiler-steam dome 20 normal water supply.After the pressure of boiler water filling motor-driven valve 14 is eased, the water in water storage box 16 enters into economizer 18 by Action of Gravity Field by boiler water filling motor-driven valve 14, and then enters into boiler-steam dome 20.
Above an embodiment of the present utility model has been described in detail, but described content being only preferred embodiment of the present utility model, can not being considered to for limiting practical range of the present utility model.All equalizations done according to the utility model application range change and improve, and all should still belong within patent covering scope of the present utility model.
Claims (10)
1. a Subcritical Units is without electric pump feedwater flow control system, comprise steam-operating supply line, high-pressure heater, boiler water filling motor-driven valve, economizer and the flowmeter of connecting successively, steam-operating supply line comprises vapour front pump, the pneumatic pump of connecting successively, it is characterized in that: the two ends of described boiler water filling motor-driven valve are parallel with flow control circuit, described flow control circuit is provided with the 6th motor-driven valve.
2. a kind of Subcritical Units according to claim 1 is without electric pump feedwater flow control system, it is characterized in that: described flow control circuit is also provided with the first non-return valve.
3. a kind of Subcritical Units according to claim 2 is without electric pump feedwater flow control system, it is characterized in that: described flow control circuit is provided with two the first non-return valves, and described two the first non-return valves are separately positioned on the both sides of the 6th motor-driven valve.
4. a kind of Subcritical Units according to claim 1-3 any one is without electric pump feedwater flow control system, it is characterized in that: one end of described flow control circuit is connected on the pipeline between boiler water filling motor-driven valve and economizer, the other end of described flow control circuit is connected on the pipeline between boiler water filling motor-driven valve and high-pressure heater, described flow control circuit is provided with water storage box, and described water storage box is arranged on the pipeline between the first non-return valve and the flow control circuit other end.
5. a kind of Subcritical Units according to claim 4 is without electric pump feedwater flow control system, it is characterized in that: the height of described water storage box lower than the height of flow control circuit one end, higher than the height of the flow control circuit other end.
6. a kind of Subcritical Units according to claim 5 is without electric pump feedwater flow control system, it is characterized in that: Subcritical Units also comprises oxygen-eliminating device and deoxygenation water tank without electric pump feedwater flow control system, be connected with steam-operating supply line after the series connection of described oxygen-eliminating device, deoxygenation water tank, described steam-operating supply line is also provided with the first motor-driven valve and the second non-return valve, described first motor-driven valve is arranged on the pipeline between deoxygenation water tank and vapour front pump, and described second non-return valve is arranged on the pipeline between pneumatic pump and high-pressure heater.
7. a kind of Subcritical Units according to claim 6 is without electric pump feedwater flow control system, it is characterized in that: described steam-operating supply line is also provided with the second motor-driven valve, and described second motor-driven valve is arranged on the pipeline between the second non-return valve and high-pressure heater.
8. a kind of Subcritical Units according to claim 7 is without electric pump feedwater flow control system, it is characterized in that: described Subcritical Units also comprises electronic supply line without electric pump feedwater flow control system, described electronic supply line and steam-operating supply line are arranged in parallel between oxygen-eliminating device and high-pressure heater, described electronic supply line are in series with successively the 5th motor-driven valve, electrodynamic pump, the 3rd non-return valve and the 3rd motor-driven valve.
9. a kind of Subcritical Units according to claim 8 is without electric pump feedwater flow control system, it is characterized in that: described electronic supply line is provided with bypass, the two ends of described bypass are connected in parallel on the two ends of the 3rd motor-driven valve respectively, and described bypass is provided with the 4th motor-driven valve.
10. a kind of Subcritical Units according to claim 9 is without electric pump feedwater flow control system, it is characterized in that: described bypass is also provided with two the first hand-operated valves, and described first hand-operated valve is separately positioned on the two ends of the 3rd motor-driven valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420727106.7U CN204285436U (en) | 2014-11-27 | 2014-11-27 | A kind of Subcritical Units is without electric pump feedwater flow control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420727106.7U CN204285436U (en) | 2014-11-27 | 2014-11-27 | A kind of Subcritical Units is without electric pump feedwater flow control system |
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| Publication Number | Publication Date |
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| CN204285436U true CN204285436U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420727106.7U Expired - Fee Related CN204285436U (en) | 2014-11-27 | 2014-11-27 | A kind of Subcritical Units is without electric pump feedwater flow control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105627292A (en) * | 2016-03-14 | 2016-06-01 | 国电长源汉川第一发电有限公司 | Boiler circulating heating system and method for boiler water |
| CN113082858A (en) * | 2021-03-03 | 2021-07-09 | 佛山市冠恒丰机电设备有限公司 | Tail gas processing apparatus for feed production |
-
2014
- 2014-11-27 CN CN201420727106.7U patent/CN204285436U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105627292A (en) * | 2016-03-14 | 2016-06-01 | 国电长源汉川第一发电有限公司 | Boiler circulating heating system and method for boiler water |
| CN113082858A (en) * | 2021-03-03 | 2021-07-09 | 佛山市冠恒丰机电设备有限公司 | Tail gas processing apparatus for feed production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20201127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |