CN103452608B - A kind of control gear for condensate system and controlling method - Google Patents
A kind of control gear for condensate system and controlling method Download PDFInfo
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- CN103452608B CN103452608B CN201310397610.5A CN201310397610A CN103452608B CN 103452608 B CN103452608 B CN 103452608B CN 201310397610 A CN201310397610 A CN 201310397610A CN 103452608 B CN103452608 B CN 103452608B
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- 238000000034 method Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 14
- 230000001143 conditioned effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000011068 loading method Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
The invention discloses a kind of control gear for condensate system, this condensate system comprises condensate pump and oxygen-eliminating device, and described control gear comprises: arrangements for speed regulation, is connected with described condensate pump, for regulating the rotating speed of described condensate pump; And controller, for regulating the rotating speed of described condensate pump by controlling described arrangements for speed regulation, meet desired pressure difference Δ P between it to make the pressure difference of described condensate pump outlet pressure and described oxygen-eliminating device outlet pressure
target, thus ensure the water flow of condensate pump outlet, can energy saving by this device, and the working life of extension device, ensure the stable operation of unit.
Description
Technical field
The present invention relates to condensate system, particularly, relate to a kind of control gear for condensate system and controlling method.
Background technique
At present, 1000MW unit condensate system is configured with 3 condensate pumps usually, and wherein a condensate pump is reserve pump, and these 3 condensate pumps are all general pumps, and itself and vapour condenser, oxygen-eliminating device etc. form condensate system.Through steam turbine steam vapour condenser cooling condensation after, concentrate in hot well, water of condensation is delivered in oxygen-eliminating device by condensate pump in time.When normally running, the water level in oxygen-eliminating device can not be too high or too low, therefore regulates the water level in oxygen-eliminating device to be the operating important process of condensate pump.
Water level adjustment in current oxygen-eliminating device adjusts oxygen-eliminating device flow of inlet water (namely condense pump discharge flow) by the aperture changing the major and minor modulating valve of water on oxygen-eliminating device and carries out.In this process, water of condensation pump curve is constant, and blade rotational speed is constant, but increases pipe resistance artificially to reduce flow by turning down modulating valve.So, a large amount of energy losses is on valve.Meanwhile, condensate pump is for a long time at a high speed and run under the state of large load, and modulating valve may be subject to enormous pressure for a long time and impacts, this not only wastes large energy, and life of equipment is reduced, affect the stable operation of unit, and substantially increase the workload of maintenance.
Summary of the invention
The object of this invention is to provide a kind of control gear and controlling method of condensate system, can energy saving by these apparatus and method, and the working life of extension device, ensure the stable operation of unit.
To achieve these goals, the invention provides a kind of control gear for condensate system, this condensate system comprises condensate pump and oxygen-eliminating device, and described control gear comprises: arrangements for speed regulation, be connected with described condensate pump, for regulating the rotating speed of described condensate pump; And controller, for regulating the rotating speed of described condensate pump by controlling described arrangements for speed regulation, meet this desired pressure difference Δ P between the two to make the pressure difference of described condensate pump outlet pressure and described oxygen-eliminating device outlet pressure
target, thus ensure the rate of discharge of condensate pump.
The present invention also provides a kind of controlling method for condensate system, this condensate system comprises vapour condenser, condensate pump and oxygen-eliminating device, and described controlling method comprises: regulate the rotating speed of described condensate pump to meet this desired pressure difference Δ P between the two to make the pressure difference of described condensate pump outlet pressure and described oxygen-eliminating device outlet pressure
target, thus ensure the rate of discharge of condensate pump.
The present invention controls arrangements for speed regulation by controller and regulates the rotating speed of condensate pump to regulate the pressure difference of condensate pump outlet pressure and described oxygen-eliminating device outlet pressure, thus the adjustment realized condensate pump rate of discharge, so avoid the long-term high speed large load operation of condensate pump, thus saved the energy, and the working life of extension device, ensure the stable operation of unit.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the block diagram according to the control gear for condensate system of the present invention;
Fig. 2 is the block diagram of the control gear for condensate system according to one embodiment of the present invention; And
Fig. 3 is the block diagram for deaerator level control section in the control gear of condensate system according to one embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 is the block diagram according to the control gear for condensate system of the present invention.Condensate system can comprise condensate pump 12 and oxygen-eliminating device (not shown).As shown in Figure 1, the control gear of condensate system provided by the present invention can comprise: arrangements for speed regulation 11, is connected with condensate pump 12, for regulating the rotating speed of described condensate pump 12; And controller 10, for regulating the rotating speed of condensate pump 12 by controlling arrangements for speed regulation 11, meet this poor Δ P of desired pressure between the two to make the pressure difference of the outlet pressure of condensate pump 12 and oxygen-eliminating device outlet pressure
target, thus ensure the rate of discharge of condensate pump 12.
Control gear provided by the present invention also can comprise condensate pump outlet valve, the water flow exported for regulating condensate pump, in embodiments of the present invention, it is full-gear that controller 10 controls this condensate pump outlet valve, thus can regulate by regulating the rotating speed of condensate pump 12 realize outlet pressure completely, and do not rely on and adjust a mouthful valve opening.Certainly, be not in full-gear and be in a larger opening and be also fine.
Fig. 2 is the block diagram of the control gear for condensate system according to one embodiment of the present invention.As shown in Figure 2, the control gear that this mode of execution provides, except comprising arrangements for speed regulation 11 and controller 10, can also comprise storage 14, pressure transducer 15 and the first PID arithmetic device 13.Wherein, the desired pressure difference Δ P that condensate system is corresponding under different load can be stored in storage 14
target, pressure transducer 15 is for detecting the current pressure difference Δ P of condensate pump outlet pressure and oxygen-eliminating device outlet pressure
current.The detailed process being determined condensate pump rotating speed by PID arithmetic will be described in detail below.
As shown in Figure 2, the first PID arithmetic device 13 desired pressure difference Δ P that will store in storage 14
targetas the dreamboat value regulated, the current pressure that pressure transducer 15 is detected difference Δ P
currentas being conditioned value, PID arithmetic being carried out to these two values, being drawn current pressure difference Δ P by computing
currentbe adjusted to desired pressure difference Δ P
targetthe rotating speed of required condensate pump.The rotating speed of the condensate pump then computing drawn transfers in controller 10, the tachometer value that the rotational speed regulation of condensate pump 12 to computing draws by arrangements for speed regulation 11 is controlled by controller 10, condensate pump 12 is run with this rotating speed, thus the desired pressure difference Δ P under the pressure difference of condensate pump outlet pressure and oxygen-eliminating device outlet pressure can be made to reach this system loading
target.
Desired pressure difference Δ P referred to above
targetcan be stored in storage 14 with the form of broken line, this broken line can be drawn for the experiment of repeatedly multiple spot under different system loadings.But the present invention is not restricted to this, those skilled in the art should understand that and can realize technique scheme of the present invention by any suitable Method means.
, should be appreciated that meanwhile, under certain system loading, utilize PID arithmetic to draw desired pressure difference Δ P
targetby the rotating speed of this condensate pump, the rotating speed of corresponding condensate pump, can ensure that the pressure of now condensate pump outlet is in ideal range, thus ensure that water flow that condensate pump exports is in ideal range.And condensate pump rotating speed, condensate pump outlet pressure and water flow between conversion relation be known in those skilled in the art, therefore repeat no more.
Fig. 3 is the block diagram for deaerator level control section in the control gear of condensate system according to one embodiment of the present invention.As shown in Figure 3, in this embodiment, control gear can also comprise second memory 18, second PID arithmetic device 16 and deaerator level control valve 17.Wherein, deaerator level control valve 17 for the water level by regulating the flow of inlet water of described oxygen-eliminating device to regulate described oxygen-eliminating device, thus ensures that deaerator level is in ideal range.The detailed process regulating deaerator level will be described in detail below.Wherein, second memory 18 and storage 14 can be same storage.
Second memory 18 can also be used for the desirable water flow F storing described condensate system oxygen-eliminating device corresponding under different load
outwith the desired level of water H of oxygen-eliminating device
target.As shown in Figure 3, the desirable water flow F that will store in second memory 18 of the second PID arithmetic device 16
outwith the desired level of water H of oxygen-eliminating device
targetas the dreamboat value regulated, by oxygen-eliminating device flow of inlet water F
inas being conditioned value, to dreamboat value be conditioned value and carry out PID arithmetic, being drawn by computing and meeting the desirable water flow F of oxygen-eliminating device
outwith the desired level of water H of oxygen-eliminating device
targetrequired oxygen-eliminating device flow of inlet water, thus calculate the aperture of the deaerator level control valve 17 met required for above-mentioned oxygen-eliminating device flow of inlet water, to realize the flow of inlet water of above-mentioned oxygen-eliminating device.Wherein, oxygen-eliminating device water inlet is that the water outlet of condensate pump outlet enters oxygen-eliminating device after deaerator level control valve, should be appreciated that, under the prerequisite guaranteeing condensate pump outlet stream amount by above-described method, can by the adjustment regulating the aperture of the modulating valve 17 of oxygen-eliminating device to regulate oxygen-eliminating device inflow to realize deaerator level.
And, experiment proves, regulate the control characteristic of deaerator level than deaerator level control valve being fixed on a certain aperture and control the control characteristic of deaerator level by means of only condensate pump rotating speed fast by deaerator level control valve 17, and control condensate pump outlet pressure by changing condensate pump rotating speed to change condensate pump outlet pressure than the aperture by changing deaerator level control valve fast.
Same, the desirable water flow F of above-mentioned oxygen-eliminating device
outwith the desired level of water H of oxygen-eliminating device
targetcan be obtained by the experiment carrying out repeatedly multiple spot under different system loadings.
In addition, in the condensate pump control loop in condensate system, frequency equilibrium loop can also be set, consistent to ensure exerting oneself of two condensate pumps.
The outlet pressure of the condensate pump 12 of control gear corresponding to the actual load of condensate system for condensate system provided by the present invention and the desired pressure difference Δ P of oxygen-eliminating device outlet pressure
target, control the rotating speed of condensate pump to reach this desired pressure difference Δ P
target, thus ensure that the pressure that the condensate pump of condensate system when different load exports and flow are within ideal range, and by regulating deaerator level control valve to ensure that deaerator level is within desired control range.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. for a control gear for condensate system, this condensate system comprises condensate pump and oxygen-eliminating device, it is characterized in that, described control gear comprises:
Arrangements for speed regulation, are connected with described condensate pump, for regulating the rotating speed of described condensate pump;
Controller, for regulating the rotating speed of described condensate pump by controlling described arrangements for speed regulation, meets this desired pressure difference Δ P between the two to make the pressure difference of described condensate pump outlet pressure and described oxygen-eliminating device outlet pressure
target, thus ensure the water flow of condensate pump outlet; And
Condensate pump outlet valve, it is full-gear that described controller controls described condensate pump outlet valve.
2. control gear according to claim 1, is characterized in that, described control gear also comprises storage and pressure transducer, and wherein, described storage is for storing described condensate system described desired pressure difference Δ P corresponding under different load
target, described pressure transducer is for detecting the current pressure difference Δ P of described condensate pump outlet pressure and described oxygen-eliminating device outlet pressure
current.
3. control gear according to claim 2, is characterized in that, described control gear also comprises the first PID arithmetic device, for the desired pressure difference Δ P corresponding under current loads to described condensate system
targetwith described current pressure difference Δ P
currentcarry out PID arithmetic, described controller controls the rotating speed of described condensate pump according to PID arithmetic result, wherein Δ P
currentvalue is conditioned for this PID arithmetic.
4. control gear according to claim 1, is characterized in that, described control gear also comprises deaerator level control valve, for the water level by regulating the flow of inlet water of described oxygen-eliminating device to regulate described oxygen-eliminating device.
5. control gear according to claim 4, is characterized in that, described control gear also comprises second memory, and this second memory is for storing the desirable water flow F of described condensate system described oxygen-eliminating device corresponding under different load
outwith the desired level of water H of described oxygen-eliminating device
target.
6. control gear according to claim 5, is characterized in that, described control gear also comprises the second PID arithmetic device, for the desirable water flow F corresponding under current loads to described condensate system
out, desired level of water H
targetand the flow of inlet water F of described oxygen-eliminating device
incarry out PID arithmetic, described controller controls the aperture of described deaerator level control valve according to PID arithmetic result, wherein F
invalue is conditioned for this PID arithmetic.
7. for a controlling method for condensate system, this condensate system comprises vapour condenser, condensate pump and oxygen-eliminating device, it is characterized in that, described controlling method comprises:
The rotating speed of described condensate pump is regulated to meet this desired pressure difference Δ P between the two to make the pressure difference of described condensate pump outlet pressure and described oxygen-eliminating device outlet pressure
target, thus ensure the water flow of condensate pump outlet;
Described condensate system also comprises condensate pump outlet valve,
It is full-gear that described controlling method also comprises the described condensate pump outlet valve of control.
8. controlling method according to claim 7, is characterized in that,
The desired pressure difference Δ P corresponding under current loads to described condensate system
targetwith the current pressure difference Δ P of described condensate pump outlet pressure and described oxygen-eliminating device pressure
currentcarry out PID arithmetic; And
The rotating speed of described condensate pump is controlled, wherein Δ P according to PID arithmetic result
currentvalue is conditioned for this PID arithmetic.
9. the controlling method according to claim 7 or 8, is characterized in that,
The desirable water flow F corresponding under current loads to described condensate system
out, desired level of water H
targetand the flow of inlet water F of described oxygen-eliminating device
incarry out PID arithmetic; And
The aperture of deaerator level control valve is controlled, wherein F according to PID arithmetic result
invalue is conditioned for this PID arithmetic.
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| CN201310397610.5A CN103452608B (en) | 2013-09-04 | 2013-09-04 | A kind of control gear for condensate system and controlling method |
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| CN201310397610.5A CN103452608B (en) | 2013-09-04 | 2013-09-04 | A kind of control gear for condensate system and controlling method |
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| CN103452608A CN103452608A (en) | 2013-12-18 |
| CN103452608B true CN103452608B (en) | 2015-08-12 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104656688A (en) * | 2014-12-24 | 2015-05-27 | 大唐贵州发耳发电有限公司 | Novel deaerator water level control system |
| CN104714566B (en) * | 2015-01-08 | 2017-08-04 | 华北电力大学 | A kind of condensate throttling control system and its method of controlling security |
| CN108061026A (en) * | 2016-11-07 | 2018-05-22 | 上海上电漕泾发电有限公司 | A kind of condensation water tune duty control method of adaptive solidifying pump operation mode |
| CN110260295B (en) * | 2019-07-22 | 2024-06-04 | 神华福能发电有限责任公司 | Condensate system |
| CN113790438B (en) * | 2021-08-06 | 2024-03-01 | 神华神东电力有限责任公司 | Method and device for switching operation mode of condensate system |
| CN113847230B (en) * | 2021-09-29 | 2024-03-26 | 西安热工研究院有限公司 | Analysis method for deep variable frequency expected effect of condensate pump |
| CN114234171B (en) * | 2021-12-02 | 2023-12-05 | 中国船舶重工集团公司第七0三研究所 | Deaerator pressure control method |
| CN114321878B (en) * | 2021-12-22 | 2023-08-15 | 江苏核电有限公司 | Transient pressure control method for deaerator during large-amplitude load shedding of nuclear power unit |
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| CN203962058U (en) * | 2013-09-04 | 2014-11-26 | 中国神华能源股份有限公司 | A kind of control gear for condensate system |
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| JPS63223489A (en) * | 1987-03-13 | 1988-09-16 | Toshiba Corp | Condensate control system |
| JPH0333495A (en) * | 1989-06-29 | 1991-02-13 | Toshiba Corp | Control device for condensate pump |
| JP2619066B2 (en) * | 1989-08-17 | 1997-06-11 | 株式会社東芝 | Deaerator water level control device |
| CN202768359U (en) * | 2012-07-18 | 2013-03-06 | 江苏徐塘发电有限责任公司 | Frequency conversion system for double condensate pumps |
| CN203052636U (en) * | 2013-01-23 | 2013-07-10 | 中国神华能源股份有限公司 | Condensate water circulation system of power plant |
| CN103133319B (en) * | 2013-02-20 | 2016-01-27 | 浙江省电力公司电力科学研究院 | A kind of condensing generator set Condensate Pump Frequency Conversion controlling method and system |
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| CN203962058U (en) * | 2013-09-04 | 2014-11-26 | 中国神华能源股份有限公司 | A kind of control gear for condensate system |
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Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee after: China Shenhua Energy Co.,Ltd. Patentee after: BEIJING GUOHUA ELECTRIC POWER Corp.,Ltd. Patentee after: Guoneng Yuedian Taishan Power Generation Co.,Ltd. Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee before: China Shenhua Energy Co.,Ltd. Patentee before: BEIJING GUOHUA ELECTRIC POWER Corp.,Ltd. Patentee before: GUANGDONG GUOHUA YUEDIAN TAISHAN POWER GENERATION Co.,Ltd. |