CN205227286U - Energy -conserving water supply system of power plant boiler - Google Patents
Energy -conserving water supply system of power plant boiler Download PDFInfo
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- CN205227286U CN205227286U CN201520920501.1U CN201520920501U CN205227286U CN 205227286 U CN205227286 U CN 205227286U CN 201520920501 U CN201520920501 U CN 201520920501U CN 205227286 U CN205227286 U CN 205227286U
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Abstract
The utility model relates to an energy -conserving water supply system of power plant boiler, include the water -feeding pump, economizer and the steam pocket that connect gradually through the pipeline, the water -feeding pump be multistage water -feeding pump, this multistage water -feeding pump is six grades of impeller water -feeding pumps, the pipeline between water -feeding pump and the economizer is equipped with the main feed valve, the both ends cross -over connection of main feed valve has the bypass pipeline of supplementary feed valve. Compared with the prior art, the utility model has the advantages of energy -conservation, safety, strong adaptability, range of application are extensively.
Description
Technical field
The utility model relates to a kind of feed water system of boiler, especially relates to the energy-conservation water supply system of a kind of station boiler.
Background technology
Boiler Feedwater System in Power Plant is one of part of boiler steam and water circuit, water supply system (high-pressure side) forms by feed pump, economizer, drum and pipeline valve etc. are every, wherein feed pump is power-equipment unique in this system, usually the feed pump power save mode implemented at present mainly adopts frequency conversion form, have that investment for trnasforming urban land is large, maintenance cost is high, be unfavorable for modernizing and expanding the existing factory waiting deficiency.
Summary of the invention
The purpose of this utility model be exactly in order to overcome above-mentioned prior art exist defect and provide a kind of energy-conservation, safety, strong adaptability, applied range station boiler energy-conservation water supply system.
The purpose of this utility model can be achieved through the following technical solutions:
The energy-conservation water supply system of a kind of station boiler, comprise the feed pump, economizer and the drum that are connected successively by pipeline, described feed pump is six grades of impeller feed pumps, and the pipeline between feed pump and economizer is provided with main feed valve, and the two ends cross-over connection of main feed valve is with the bypass duct of extra feed valve.
The internal diameter of the bypass duct at extra feed valve place is 1/3 ~ 2/3 of the internal diameter of the pipeline at main feed valve place.
Preferably, the internal diameter of the bypass duct at extra feed valve place is 1/2 of the internal diameter of the pipeline at main feed valve place.
Described main feed valve and extra feed valve are respectively equipped with valve opening governor motion.
Also be provided with the exhausting pipeline of economizer to drum between described economizer and drum, this pipeline be provided with keying two position electrically operated valve.
Described drum is HP steam drum.
The top of described HP steam drum is provided with jet chimney, and one end side is provided with continuous blowdown pipeline, and bottom is provided with urgent outlet conduit.
Feed pump will feed water supercharging, and carry out Flow-rate adjustment by main feed valve, feed water to enter HP steam drum through economizer after regulating.The utility model reduces feed pump energy consumption by the mode reducing feed pump impeller, consequent feed pressure loss is compensated by the improvement of water supply system miscellaneous part: namely by increasing feed-regulating valve aperture, to reduce over flowing pressure loss, make up the feed pressure loss owing to causing after feed pump transformation.The progression of the Multi-level water-feeding pump before improvement is seven grades, main feed valve aperture about 72% under flow at full capacity, when differential pressure when the differential pressure that feed-regulating valve main under this aperture condition is formed deducts main feed-regulating valve standard-sized sheet is greater than the lift of feed pump minimizing, just obtain energy-saving benefit by reducing feedwater pump lift; Improvements of the present utility model are, remove the one stage impeller of feed pump, after the progression of feed pump is kept to six grades by seven grades, when under flow at full capacity, main feed valve aperture increases to 90%, the restriction loss that can realize being reduced by the increase of main feed valve aperture carrys out the headloss reduced after make-up water pump removes one stage impeller.
Compared with prior art, the utility model has the following advantages:
(1) reduce energy resource consumption, improve the utilization ratio of the energy: after extracting feed pump one stage impeller, feed pump lift reduces 195.5m, can save power of motor 308.9kW, considers actual operating mode, supposes that feed pump year saving power is 200kW.Hours of operation over the years is about 6000 hours, and rate for incorporation into the power network calculates with 0.45 yuan/kWh, and year saves station service 1,200,000 kWh, reduces expenses 540,000 yuan, saves mark coal 360t year.
(2) on the impact of high-pressure feed water system cloud gray model safety nothing: the restriction loss being reduced water-supply valve by the aperture increasing main feed valve, participate in regulating by extra feed valve during underfed, experiment also proves not produce safely any adverse effect to water supply system and even combustion engine, steam turbine, boiler operatiopn.
(3) improvement has strong adaptability feature: improve and adopt draw-off pump impeller mode, while not destroying structure, can reducing feed pump high pressure lift, have invertibity, can restore to the original state when needing from now on.Another investment for trnasforming urban land is low, requires low, be easy to implement easy, bring notable results objective condition such as places.
(4) applied range: under the prerequisite not changing current device state and layout, all station boilers all can be implemented, energy-saving benefit is given prominence to, and meets Enterprise Lean management expectancy, meets the construction efficient energy-saving social desirability of current promotion.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is the valve characteristic curve of main feed valve;
In figure, 1 is feed pump, 2 is economizer, 3 is HP steam drum, 4 is main feed valve, 5 is extra feed valve, 6 be jet chimney, 7 for HP steam drum continuous blowdown pipeline, 8 is the urgent outlet conduit of HP steam drum, 9 is the exhausting pipeline of economizer to HP steam drum, and 10 is economizer and HP steam drum connecting pipe.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment 1
The energy-conservation water supply system of a kind of station boiler; as shown in Figure 1; comprise the feed pump 1, economizer 2 and the drum that are connected successively by pipeline; this drum is HP steam drum 3; except economizer and HP steam drum connecting line 10, the exhausting pipeline 9 of economizer to HP steam drum 3 is also provided with between economizer 2 and HP steam drum 3; which is provided with motor-driven valve; in order to start or shut down time for air in economizer 2 is discharged fast; open this valve sometimes; the air in economizer 2 is discharged by this pipeline; normally run at ordinary times, this valve is in closed condition.Feed pump 1 is the six grades of impeller feed pumps taking off one stage impeller formation on the basis of original seven grades of impeller feed pumps, pipeline between feed pump 1 and economizer 2 is provided with main feed valve 4, the two ends cross-over connection of main feed valve 4 is with the bypass duct of extra feed valve 5, the caliber of the bypass duct at extra feed valve 5 place is 1/2 of the pipeline diameter at main feed valve 4 place, and main feed valve 4 and extra feed valve 5 are respectively equipped with valve opening governor motion; The top of HP steam drum 3 is provided with jet chimney 6, for delivering vapor, one end side is provided with HP steam drum blow-off line, bottom is provided with the urgent outlet conduit of HP steam drum, wherein, HP steam drum continuous blowdown pipeline 7 is provided with motor-driven valve, and the urgent outlet conduit 8 of HP steam drum is provided with motor-driven valve and magnetic valve, and economizer is provided with motor-driven valve to the exhausting pipeline 9 of drum.
The original feed pump 1 in this power station is seven grades of impeller feed pumps, and by the monitoring of high-pressure feed water system in unit high load capacity section operational factor, before and after main feed valve 4, pressure reduction is about about 3.3MPa, aperture maximum about 72%; With reference to Fig. 2 main feed valve 4 valve characteristic curve, obtain the relation of pressure reduction (measured value) before and after pressure reduction (calculated value), valve before and after valve opening, valve, as shown in table 1,
| Valve opening | Pressure reduction (calculated value) before and after valve | Pressure reduction (measured value) before and after valve |
| 72％ | 4.243MPa | 3.34MPa |
| 90％ | 0.756MPa | 0.74MPa |
The restriction loss of visible main feed valve 4 is very large; At full capacity under flow, when the differential pressure of valve is greater than the lift reduced by feed pump when the differential pressure that main feed valve 4 provides deducts standard-sized sheet, just likely obtain energy-saving benefit by reducing feedwater pump lift.
The lift of feed pump 1 is 1369m, and after cutting one stage impeller, lift reduces 1369/7=195.5m;
Feed pump 1 is taken off on the basis of original seven grades of impeller feed pumps six grades of impeller feed pumps that one stage impeller is formed, now by main feed valve 4 from current aperture to standard-sized sheet after resistance decreasing value=3.34-0.74=2.6MPa > 1.95MPa, the reduction extracting lift after one stage impeller as can be seen here can increase by main feed valve 4 aperture the SR reduced completely and compensate.
According to main feed valve 4 performance curve, when aperture is 75% ~ 90%, can meets and subtract pressure needed for high-pressure feed water after one-level.Time at full capacity, when main feed valve aperture reaches 87 ~ 90%, working condition requirement can be met.The utility model, by increasing the valve opening of main feed valve 4, reduces throttling energy loss, thus reaches the object of saving the energy.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, and difference is that the caliber of the bypass duct at extra feed valve 5 place is 1/3 of the pipeline diameter at main feed valve 4 place.
Embodiment 3
The present embodiment is substantially the same manner as Example 1, and difference is that the caliber of the bypass duct at extra feed valve 5 place is 2/3 of the pipeline diameter at main feed valve 4 place.
Claims (7)
1. the energy-conservation water supply system of station boiler, comprise the feed pump, economizer and the drum that are connected successively by pipeline, it is characterized in that, described feed pump is six grades of impeller feed pumps, pipeline between feed pump and economizer is provided with main feed valve, and the two ends cross-over connection of main feed valve is with the bypass duct of extra feed valve.
2. the energy-conservation water supply system of a kind of station boiler according to claim 1, it is characterized in that, the internal diameter of the bypass duct at extra feed valve place is 1/3 ~ 2/3 of the internal diameter of the pipeline at main feed valve place.
3. the energy-conservation water supply system of a kind of station boiler according to claim 2, is characterized in that, the internal diameter of the bypass duct at extra feed valve place is 1/2 of the internal diameter of the pipeline at main feed valve place.
4. the energy-conservation water supply system of a kind of station boiler according to claim 1, it is characterized in that, described main feed valve and extra feed valve are respectively equipped with valve opening governor motion.
5. the energy-conservation water supply system of a kind of station boiler according to claim 1, is characterized in that, is also provided with the exhausting pipeline of economizer to drum between described economizer and drum, this pipeline is provided with keying two position electrically operated valve.
6. the energy-conservation water supply system of a kind of station boiler according to claim 1, is characterized in that, described drum is HP steam drum.
7. the energy-conservation water supply system of a kind of station boiler according to claim 6, it is characterized in that, the top of described HP steam drum is provided with jet chimney, and one end side is provided with continuous blowdown pipeline, and bottom is provided with urgent outlet conduit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520920501.1U CN205227286U (en) | 2015-11-18 | 2015-11-18 | Energy -conserving water supply system of power plant boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520920501.1U CN205227286U (en) | 2015-11-18 | 2015-11-18 | Energy -conserving water supply system of power plant boiler |
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| Publication Number | Publication Date |
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| CN205227286U true CN205227286U (en) | 2016-05-11 |
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| CN201520920501.1U Active CN205227286U (en) | 2015-11-18 | 2015-11-18 | Energy -conserving water supply system of power plant boiler |
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