CN103453517A - Water supply control system in 2*55MW power station boiler water supply system - Google Patents
Water supply control system in 2*55MW power station boiler water supply system Download PDFInfo
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- CN103453517A CN103453517A CN 201310402856 CN201310402856A CN103453517A CN 103453517 A CN103453517 A CN 103453517A CN 201310402856 CN201310402856 CN 201310402856 CN 201310402856 A CN201310402856 A CN 201310402856A CN 103453517 A CN103453517 A CN 103453517A
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Abstract
The invention discloses a water supply control system in a 2*55MW power station boiler water supply system. In a thermal power plant, secondary auxiliary engines such as water pumps and draught fans are high in capacity and consume much energy, thereby being main power utilization equipment. The operation mode of a previous feed pump mainly adopts a power frequency operation mode, the flow rate of the feed pump is controlled by adjusting a valve, and the control method has the defects that the waste of electric energy is large, the real-time performance of adjustment is poor, noises are large, and the labor intensity of workers is high. The water supply control system disclosed by the invention comprises a signal comparator (1), a high voltage converter (2), a motor (3), a water pump (4), a valve (5), a pressure gauge (6) and a differential pressure transmitter (7), wherein the signal comparator (1) is connected with the high voltage converter (2), the high voltage converter is connected with the motor (3), the motor is connected with the water pump (4), the water pump is connected with the valve (5), the valve is connected with the pressure gauge (6) by virtue of a pipeline, the pressure gauge is connected with the differential pressure transmitter (7) by virtue of a pipeline, and the differential pressure transmitter is connected with the signal comparator. The water supply control system disclosed by the invention is applied to water supply control of a power station boiler.
Description
technical field:
the present invention relates to the feed water control system in a kind of 2 * 55MW Boiler Feedwater System in Power Plant.
background technology:
in thermal power plant, the capacity of the secondary subsidiary engines such as water pump and blower fan is large, power consumption is many, is main current consuming apparatus.The method of operation of feed pump in the past is mainly power frequency operation, and its uninterrupted is to control by the method for control valve, and the shortcoming of this control mode is that waste of energy is large, and the adjusting real-time is poor, and noise is large, and labor strength is also large.Along with the adjustment on a large scale of generation load, the feed pump flow also changes often in a kind of fall-back state because of boiler load, and most of energy dissipation is on the valve regulated baffle plate.Due to this particularity of electric load allotment, make the long-term operation continuously of these equipment or, often in underload and variable load operation state, rely on merely traditional baffle plate, valve and fluid coupling speed governing to make energy loss huge.
summary of the invention:
the purpose of this invention is to provide the feed water control system in a kind of 2 * 55MW Boiler Feedwater System in Power Plant.
above-mentioned purpose realizes by following technical scheme:
feed water control system in a kind of 2 * 55MW Boiler Feedwater System in Power Plant, its composition comprises: signal comparator, described signal comparator is connected with high voltage converter, described high voltage converter is connected with motor, described motor is connected with water pump, and described water pump is connected with valve, and described valve is connected by pipeline with Pressure gauge, described Pressure gauge is connected by pipeline with differential pressure transmitter, and described differential pressure transmitter is connected with described signal comparator.
beneficial effect:
the present invention reacts soon, good stability, and antijamming capability is strong.In addition, by the application of rotational speed regulation flow, the consumed power of water pump will greatly reduce with the three cubed relation of rotating speed, and energy saving of system is obvious.
the accompanying drawing explanation:
accompanying drawing 1 is structural representation of the present invention.
the specific embodiment:
embodiment 1:
feed water control system in a kind of 2 * 55MW Boiler Feedwater System in Power Plant, its composition comprises: signal comparator 1, described signal comparator is connected with high voltage converter 2, described high voltage converter is connected with motor 3, described motor is connected with water pump 4, and described water pump is connected with valve 5, and described valve is connected by pipeline with Pressure gauge 6, described Pressure gauge is connected by pipeline with differential pressure transmitter 7, and described differential pressure transmitter is connected with described signal comparator.
embodiment 2:
feed water control system in described 2 * 55MW Boiler Feedwater System in Power Plant, after frequency converter drops into high pressure, the factor of major effect integrated protection action is the excitation surge current of dry-type transformer.POWERSMART series high voltage frequency converter adopts the multilevel unit-in-series technology, and input is provided with dry type cutting transformer.According to the instructions for use of transformer, transformer need be after impacting for 5 times and closing a floodgate in when trial run, and unloaded 30 minutes without run with load progressively after abnormal.In the reality starting, frequency converter one is charged; upper end high powered cabinet is combined and is protected tripping operation immediately; by analysis fault from frequency converter the excitation surge current when just throwing; the size of excitation surge current depends on the voltage of circuit while dropping into transformer and the situation of phase place and iron core residual flux; generally can reach 80 ~ 100 times or 6 ~ 8 times of rated current of no-load current; its value is through several all wave attenuations, and the size of its value very easily causes the overcurrent of transformer and combines and protect differential protection.Combine in view of the impact of transformer excitation flow will be subject to electric cabinet the motor quick-break electric current of protecting, by original 8In, adjust to 10In, the frequency converter trip problem that powers on solves.Differential protection after startup, the native system major loop is provided with has differential protection function to motor, and the difference current in motor envelope asterism place access current transformer checks motor operation course is as a kind of back-up protection of electric motor protecting.Due to frequency converter frequency when starting given by 0HZ to the frequency of setting, the initial stage that AC magnetic field is set up when low-frequency start can produce out-of-balance current, will cause the differential protection action, along with the rising out-of-balance current of frequency reduces reduction gradually; So motor is being required to have during differential protection can only throw into the motor power frequency operation.When conversion system is worked, this function is cancelled, and by realizing combining arranging of protecting, otherwise causes differential protection tripping operation action when frequency converter starts.
embodiment 3:
feed water control system in described 2 * 55MW Boiler Feedwater System in Power Plant, economic benefit and social benefit that the application in power plant in Ji of nine continent high voltage converters is obtained are apparent, save electric energy loss on the one hand, have reduced the boiler feedwater cost; The 2nd, increased the system speed adjustable range, along with the control that the frequency converter output frequency changes the pipe network flow is passed through in the variation adjustment of generation load, improved the flexibility of system operation; After the feed pump frequency control, the outlet pressure of the rotating speed of motor, electric current, water pump all obviously descends, the operation conditions of motor and water pump is obviously improved, direct saving power consumption not only, and, soft start function due to frequency converter, reduced the impact to motor and electrical network, extended the service life of equipment, reduced the maintenance cost of equipment, the use of frequency converter has obtained the consistent favorable comment of owner and CMEC contractor, the safe and reliable operation of whole power grid in Sudan is also played an important role simultaneously.
Claims (1)
1. the feed water control system in 2 * 55MW Boiler Feedwater System in Power Plant, its composition comprises: signal comparator, it is characterized in that: described signal comparator is connected with high voltage converter, described high voltage converter is connected with motor, described motor is connected with water pump, and described water pump is connected with valve, and described valve is connected by pipeline with Pressure gauge, described Pressure gauge is connected by pipeline with differential pressure transmitter, and described differential pressure transmitter is connected with described signal comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310402856 CN103453517A (en) | 2013-09-08 | 2013-09-08 | Water supply control system in 2*55MW power station boiler water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310402856 CN103453517A (en) | 2013-09-08 | 2013-09-08 | Water supply control system in 2*55MW power station boiler water supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103453517A true CN103453517A (en) | 2013-12-18 |
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ID=49736177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201310402856 Withdrawn CN103453517A (en) | 2013-09-08 | 2013-09-08 | Water supply control system in 2*55MW power station boiler water supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103453517A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791485A (en) * | 2014-02-28 | 2014-05-14 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| CN105627291A (en) * | 2014-12-01 | 2016-06-01 | 安阳方快锅炉有限公司 | Variable-frequency water supply control method for steam boiler |
-
2013
- 2013-09-08 CN CN 201310402856 patent/CN103453517A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791485A (en) * | 2014-02-28 | 2014-05-14 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| CN103791485B (en) * | 2014-02-28 | 2015-04-22 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| CN105627291A (en) * | 2014-12-01 | 2016-06-01 | 安阳方快锅炉有限公司 | Variable-frequency water supply control method for steam boiler |
| CN105627291B (en) * | 2014-12-01 | 2017-10-20 | 方快锅炉有限公司 | A kind of steam boiler frequency conversion water supply control method |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20131218 |