CN202203930U - Feed water system of combined cycle generating unit - Google Patents
Feed water system of combined cycle generating unit Download PDFInfo
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- CN202203930U CN202203930U CN2011203202420U CN201120320242U CN202203930U CN 202203930 U CN202203930 U CN 202203930U CN 2011203202420 U CN2011203202420 U CN 2011203202420U CN 201120320242 U CN201120320242 U CN 201120320242U CN 202203930 U CN202203930 U CN 202203930U
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- pump
- feed
- pressure
- feed water
- feed pump
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Abstract
The utility model discloses a feed water system of a combined cycle generating unit. The feed water system at least comprises a high pressure feed water pipeline used for outputting high pressure feed water and a valve, a medium-pressure feed water pipeline used for outputting medium-pressure feed water and a valve, a low pressure feed water pipeline used for outputting low pressure recirculating water and a valve, a minimum flow pipeline used for protecting minimum flow of a pump and a valve, and a feed pump, wherein the feed pump is utilized as a high pressure feed water pump, a medium-pressure feed pump and a low pressure recirculating pump; the high pressure feed water pipeline and the valve are communicated with the outlet of the feed pump, the medium-pressure feed water pipeline is communicated with a third level of the feed pump, and the low pressure feed water pipeline is communicated with a second level of the feed pump; and the minimum flow pipeline is communicated with the outlet of the feed pump so as to return to an inlet of a condensed water heater. The feed water system provided by the utility model adopts an integrated high pressure, medium-pressure and low pressure pump, thereby saving the cost of the feed water system, and the operational reliability of the feed water system is improved.
Description
Technical field
The utility model relates to the generating equipment technical field, relates in particular to a kind of water supply system of combustion and steam Combined Cycle Unit.
Background technology
In the prior art in combined cycle generation field; Siemens SCC5-4000F type combustion and steam combined cycle generation unit adopts and three to press, heat, no afterburning, Natural Circulation waste heat boiler again; Fuel gas exhaust is got into by the A place of waste heat boiler 4 belows; Form the flue gas discharge from the B of waste heat boiler 4 tops, water supply system is had the requirement of high, medium and low three kinds of different pressures grades.Be illustrated in figure 1 as the flow direction and the purposes of the feedwater of high, medium and low three kinds of pressure ratings in the water supply system of waste heat boiler 4:
To low pressure feed water; From the next condensate 5 of steam turbine; After 3 heating of condensate heater, low pressure recirculation pump 11 is got back to 3 imports of condensate heater with one road low pressure feed water and is carried out the blending heating, to improve waste heat boiler 4 outlet cigarette temperature; Prevent waste heat boiler 4 outlet conduit cold end corrosions, low pressure feed water gets into low-pressure drum 21 then.
Centering is pressed feedwater, middle pressure feed pump 12 will feed water through in press economizer 6 heating after, send into middle pressure drum 22.
To high-pressure feed water, high pressure water pump 13 is sent into high pressure drum 23 after high-pressure feed water is sent into high-pressure economizer 7 heating.
For satisfying the above-mentioned requirements of waste heat boiler feed pressure, the conventional design of firing dynamo-electric factory water supply system at present has three kinds:
Be illustrated in figure 2 as a kind of water supply system, wherein high pressure water pump 13, middle pressure feed pump 12, low pressure recirculation pump 11 all adopt the version of wheel cylinder, need the pump of three platform independent altogether.
Be illustrated in figure 3 as another water supply system, wherein high pressure water pump, middle pressure feed pump adopt the version of closing pump 12 (pressing tap 14 in the band), low pressure recirculation pump 11 wheel cylinders, the pump of need two platform independent altogether.
Be illustrated in figure 4 as another kind of water supply system, high pressure water pump 13 wheel cylinders wherein, middle pressure feed pump, low pressure recirculation pump adopt the version of closing pump 12 (band low pressure tap 15), also need the pump of two platform independent.
For guaranteeing the generating set reliability of operation; The actual disposition of various water supply systems is the using and the reserved form in practical application; Be six pumps of water supply system actual needs configuration shown in Figure 2; Fig. 3, water supply system actual needs shown in Figure 4 dispose four pumps respectively, and the buying expenses of pump, operational management, repair and maintenance expense are all very high.
Therefore, those skilled in the art is devoted to develop that a kind of cost is low, the water supply system of good reliability, operation and combustion and steam combined cycle generation unit easy to maintenance to be to overcome above-mentioned defective.
The utility model content
Because the above-mentioned defective of prior art, the utility model technical problem to be solved provides that a kind of cost is low, the water supply system of good reliability, operation and combined cycle generation unit easy to maintenance, improves with the above-mentioned defective to prior art.
For realizing above-mentioned purpose; The utility model provides a kind of water supply system of combined cycle generation unit, comprises the high-pressure feed water pipeline and the valve that are used for exporting high-pressure feed water at least, is used for exporting pressure feedwater piping and valve, the low pressure feed water pipeline and the valve that are used to export low pressure recirculation of pressing feedwater, is used for minimum discharge pipeline and valve to the protection of pump minimum discharge; Also comprise a feed pump, double high pressure water pump, middle pressure feed pump and the low pressure recirculation pump done of said feed pump; Said high-pressure feed water pipeline and valve are communicated with said feed pump outlet, and the said middle feedwater piping of pressing is communicated with the third level of said feed pump, and said low pressure feed water pipeline is communicated with the second level of said feed pump; Said minimum discharge pipeline is communicated with said feed pump outlet, and gets back to the import of condensate heater.
Further, said middle the press flow of the low pressure feed water in the middle pressure feedwater in the feedwater piping, the said low pressure recirculation conduit and the initialization system requirement that pressure all meets said Combined Cycle Unit.
Further, said Combined Cycle Unit comprises the using and the reserved two cover water supply systems, and the said water supply system of two covers comprises a double feed pump of doing high pressure water pump, middle pressure feed pump and low pressure recirculation pump respectively.
Further, said feed pump is the two-tap feed pump.
The beneficial effect of the utility model is:
The water supply system of the utility model has adopted the pump form of closing of high, medium and low voltage three pumps unifications, thereby has saved feed pump body investment of devices cost.
Owing to reduced the quantity of feed pump, the utility model has also been saved the cost of investment of water supply system pipeline, valve, the lubricating oil system cost of investment of having saved feed pump and driving arrangement.
In addition, because the quantity of feed pump reduces, the utility model has also improved the operational reliability of water supply system.In water supply system, the fault of any feed pump all will cause unit jumping machine, and the rate of breakdown of the water supply system of therefore existing wheel cylinder form is higher than the pump form of closing of the utility model.
The feed pump stage casing that the water supply system of the utility model adopts is equal thickness not; This design is to design according to the thermal expansion amount of feed pump and amount of deflection; This kind design can prevent that feed pump is under various rotating speeds; Especially the contacting of rotor and stationary parts when the slow-speed of revolution, thus the feed pump reliability of operation improved, also make the water supply system of the utility model need not be equipped with the warming-up system.
The utility model has also reduced the civil engineering of power plant construction and the expense on the steel construction.
Below will combine accompanying drawing that the technique effect of design, concrete structure and the generation of the utility model is described further, with purpose, characteristic and the effect of understanding the utility model fully.
Description of drawings
Fig. 1 be in the prior art combustion and steam combined cycle generation unit water supply system require sketch map.
Fig. 2 is the structural representation of a kind of water supply system in the prior art.
Fig. 3 is the structural representation of another water supply system in the prior art.
Fig. 4 is the structural representation of another kind of water supply system in the prior art.
Fig. 5 is the structural representation of water supply system one specific embodiment of the utility model.
The specific embodiment
As shown in Figure 5; Water supply system one specific embodiment of the combined cycle generation unit of the utility model comprises the high-pressure feed water pipeline that is used for exporting high-pressure feed water, is used for exporting pressure feedwater piping, the low pressure feed water pipeline that is used to export low pressure recirculation of pressing feedwater, is used for minimum discharge pipeline and valve to the protection of pump minimum discharge.
The special feature of the utility model is, also comprises a feed pump 11.This feed pump 11 is a two-tap, double high pressure water pump, middle pressure feed pump and the low pressure recirculation pump done.The high-pressure feed water pipeline of high-pressure feed water and valve are communicated with feed pump 11 outlets, and middle pressure feedwater piping 110 is communicated with the third level of feed pump 11, and low pressure recirculation conduit 111 is communicated with the second level of feed pump 11.
In practical implementation, the middle pressure feedwater in the middle pressure feedwater piping, the flow of the low pressure feed water in the low pressure recirculation conduit and the initialization system requirement that pressure all should satisfy Combined Cycle Unit, this initialization system requires to obtain according to the different parameters data computation of unit.
Be set to the using and the reserved form according to water supply system, when adopting high, medium and low pressing pump form, every unit reality only need dispose two feed pumps, and the buying expenses of pump has reduced by 20% to 30% than existing employing high, medium and low voltage three pump forms.
Particularly, when the general power of feed pump 11 under design conditions is 2015kW, calculate 1067.144 ten thousand yuan/year of plant consumption expenses with 4 units of full factory of a certain power plant, year operation 2000 hours, 0.662 yuan/kWh of rate for incorporation into the power network.Compare existing high, medium and low voltage three pump forms; Adopt the water supply system of closing the pump form of the utility model; 124.46 ten thousand yuan of the cost savings of year station service are compared the expense of the double pump form station service of existing senior middle school pressing pump+low pressure recirculation pump and can be saved 106.45 ten thousand yuan.
The utility model has also reduced the maintenance and the maintenance workload of feed pump, and the standby redundancy of single feed pump and maintenance manual work are also much smaller than high, medium and low voltage wheel cylinder form or double pump form.
The stage casing of the feed pump 11 that the water supply system of the utility model adopts is equal thickness not; This design is to design according to the thermal expansion amount of feed pump and amount of deflection; This kind design can prevent that feed pump is under various rotating speeds; Especially the contacting of rotor and stationary parts when the slow-speed of revolution, thus the feed pump reliability of operation improved, also make the water supply system of the utility model need not be equipped with the warming-up system.
The operational reliability of the pump form of closing of the utility model is high.Particularly, it is about 4.3% that the operational reliability of closing the pump form of the utility model presses the wheel cylinder forms to improve than shown in Figure 2 high, medium and low three, and than high-pressure pump wheel cylinder shown in Figure 4, the mesolow pump closes the pump form and improved about 2.13%.And close pump pipe valve quantity and the operation far below the wheel cylinder form, more help reducing the probability that causes the unnecessary tripping operation of unit because of operations staff's misoperation.
According to a unit; The feed pump the using and the reserved are calculated; Adopt water supply system that high, medium and low voltage three pumps of the utility model close the pump form will save 75% at the unit than three pump forms of existing employing high, medium and low voltage wheel cylinder aspect the use amount of total floor space of unit and steel construction; Than adopting the high pressure wheel cylinder, in, the unit of the double pump form of low pressing pump will save 62%.
The utility model has also reduced the energy resource consumption of the water supply system of Combined Cycle Unit, and the efficient of closing pump form feed pump is higher by 2% to 5% than wheel cylinder.
More than describe the preferred embodiment of the utility model in detail.Should be appreciated that those of ordinary skill in the art need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, all technical staff in the art according to the design of the utility model on the basis of existing technology through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in determined protection domain by claims.
Claims (4)
1. the water supply system of a combined cycle generation unit comprises the high-pressure feed water pipeline and the valve that are used for exporting high-pressure feed water at least, is used for exporting pressure feedwater piping and valve, the low pressure feed water pipeline and the valve that are used to export low pressure recirculation of pressing feedwater, is used for minimum discharge pipeline and valve to the protection of pump minimum discharge; It is characterized in that: also comprise a feed pump, double high pressure water pump, middle pressure feed pump and the low pressure recirculation pump done of said feed pump; Said high-pressure feed water pipeline and valve are communicated with said feed pump outlet, and the said middle feedwater piping of pressing is communicated with the third level of said feed pump, and said low pressure feed water pipeline is communicated with the second level of said feed pump; Said minimum discharge pipeline is communicated with said feed pump outlet, and gets back to the import of condensate heater.
2. water supply system as claimed in claim 1 is characterized in that: said Combined Cycle Unit comprises the using and the reserved two cover water supply systems, and the said water supply system of two covers comprises a double feed pump of doing high pressure water pump, middle pressure feed pump and low pressure recirculation pump respectively.
3. water supply system as claimed in claim 1 is characterized in that: said feed pump is the two-tap feed pump.
4. water supply system as claimed in claim 1 is characterized in that: press the flow of the low pressure feed water in the middle pressure feedwater in the feedwater piping, the said low pressure recirculation conduit and the initialization system requirement that pressure all meets said Combined Cycle Unit in said.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203202420U CN202203930U (en) | 2011-08-30 | 2011-08-30 | Feed water system of combined cycle generating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203202420U CN202203930U (en) | 2011-08-30 | 2011-08-30 | Feed water system of combined cycle generating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202203930U true CN202203930U (en) | 2012-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203202420U Expired - Lifetime CN202203930U (en) | 2011-08-30 | 2011-08-30 | Feed water system of combined cycle generating unit |
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| CN (1) | CN202203930U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353037A (en) * | 2011-08-30 | 2012-02-15 | 上海申能临港燃机发电有限公司 | Water supply system of combined cycle generating unit |
-
2011
- 2011-08-30 CN CN2011203202420U patent/CN202203930U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353037A (en) * | 2011-08-30 | 2012-02-15 | 上海申能临港燃机发电有限公司 | Water supply system of combined cycle generating unit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120425 |
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| CX01 | Expiry of patent term |