CN103267013B - Variable flow water system energy-saving method based on combination of large pump and small pump - Google Patents
Variable flow water system energy-saving method based on combination of large pump and small pump Download PDFInfo
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- CN103267013B CN103267013B CN201310201346.3A CN201310201346A CN103267013B CN 103267013 B CN103267013 B CN 103267013B CN 201310201346 A CN201310201346 A CN 201310201346A CN 103267013 B CN103267013 B CN 103267013B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 107
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- 238000004140 cleaning Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000010977 unit operation Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 7
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- 230000000694 effects Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
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Abstract
The invention provides a variable flow water system energy-saving method based on combination of large and small pumps, which can improve or eliminate the working conditions of low efficiency and high energy consumption of the water system by analyzing and modifying the working condition of the existing water system and selecting a proper new water pump for the new water pump, thereby improving the working efficiency of the water system, enabling the water pump motor to run more stably, effectively inhibiting the phenomena of heating, vibration, noise, cavitation and the like, solving the problem of unreasonable matching of the water pump and a system pipe network under different working conditions, and comparing experimental data.
Description
Technical field
The present invention relates to a kind of variable water volume system power-economizing method based on the associating of size pump.
Background technique
Water conveying or the circulatory system are widely used in the fields such as cooling, circulation, feedwater, and its power consumption is huge, reaches 20% of world's electric quantity consumption.In water conveying or the circulatory system, there is water pump in a large number and mate irrational problem with system pipe network, cause great energy waste.
For the soft ring pumping plant cooling circulating water system of somewhere, northwest Stainless Steel Plant, cooling circulating water system adopts vari-able flow control, under operating conditions, water from chilled water absorbing well, absorption well is delivered to plate type heat exchanger by the recycle pump of this system, the board-like heat exchanger entrance butterfly valve of manual tune, and the temperature maintaining two nets is no more than 35 DEG C, through plate type heat exchanger and two net backwater heat exchange, flow to after cooling tower lowers the temperature, flow back to absorbing well, absorption well, so move in circles.
The energy consumption of soft ring pumping plant cooling circulating water system is mainly produced by water pump.In the engineering of reality, the conventional design of water system and pump selection usually press the most unfavorable processing condition design and coupling, and in order to unilateral pursuit safety, in design selection, generally all give the safety coefficient of 110%-150%; Summer in order to maintain the temperature of two nets, exit of pump valve wide open, water pump is in flow bigger than normal, efficient district runs, and energy consumption increases; Winter due to outdoor temperature low, in order to maintain two net temperature " supercooling ", and exit of pump valve being adjusted, outlet valve causing a large amount of headlosses, causes energy consumption to increase.
Differ greatly for this winter in summer operating mode, run more stable water system at present, the power save mode of most employing variable frequency adjustment, but the effect of thorough energy-saving and emission-reduction can not be played, in addition regulation range is only 40-45Hz to frequency conversion the best, the power consumption of frequency variator own is 3 ~ 5% of whole system and frequency variator cost compare is high, so seek the more suitably energy-conservation method for correcting error of one.
Summary of the invention
The invention provides a kind of variable water volume system power-economizing method based on the associating of size pump, its objective is that profit realizes most energy-saving run to the conveying of water and the circulatory system in this way, solve water pump and mate the unreasonable energy consumption problem caused with system pipe network.
Based on a variable water volume system power-economizing method for size pump associating, comprise the following steps:
Step 1: measure the operating mode service data of existing water system at winter, Xia Liangji;
Step 2: the operating mode recorded according to step 1 detects existing water system pipe network and keeps in repair;
Step 3: exceed one day of temperature 4 ° ~ 8 ° same period respectively in summer and winter temperature, the actual conditions of the water system after acquisition testing and maintenance, namely repeats to measure described in step 1, calculates pump head and pump capacity;
Step 4: choose exit of pump flow and pump head in the actual conditions met described in step 3 and the water pump in existing water system replaced by the water pump being operated in high efficiency area of pump operation;
Described high efficiency area of pump operation refers to and is not less than the efficiency area scope that pump efficiency peak plays decline 5%-8%;
Wherein, in described step 1, the operating mode service data of existing water system comprises:
(1) the nameplate parameter of water pump and motor;
Water pump nameplate parameter comprises rated flow, rated head, rated speed and necessary electromotor power;
Motor nameplate parameter comprises rated current, voltage rating, rated power, rated speed and power factor;
(2) the operate power P of pump motor;
(3) water pump into and out of saliva Nodes liquid pressure, flow velocity and go out saliva node flow Q;
(4) heat-exchange device internal resistance;
Pump head formula in described step 3 is as follows, and pump head calculated and adopted formula 1 summer, and pump head calculated and adopted formula (2) winter:
In formula: p
4, p
3for the pressure of exit of pump, import water Nodes liquid;
V
4, v
3for the flow velocity of pump discharge, inlet's liquid;
△ z is the height difference between pump discharge, inlet pressure meter apparatus;
In formula: p
6, p
5be respectively the pressure of exit of pump header valve water Nodes fluid pressure, import water Nodes liquid behind the door;
V
6, v
5for the flow velocity of pump discharge house steward, inlet's liquid;
△ z
cfor the height difference between pump discharge house steward, inlet duct pressure meter apparatus;
∑ h is hydraulic loss, refers to the hydraulic loss of whole device pipe-line system, comprises linear loss h
1with local head loss h
2;
v is flow rate of liquid, and L is the length of straight tube, and d is the caliber of straight tube, and λ is friction loss coefficient, and L is the length of pipeline, and d is the diameter of pipeline, and g is gravity accleration, and ζ is local loosening, and inquiry Moody chart obtains.
The operating mode recorded according to step 1 in described step 2 detects existing water system pipe network and keeps in repair, and concrete operation step is as follows:
1) detect pump intake place water flow Q in water system
1with the water flow Q of the water outlet of water system pipe network node
2if both differ by more than 3%, then run in decision-making system pipe network, emit, leak and dripping phenomenon serious, check successively from inlet's node to water system pipe network node water outlet, the node that there is this phenomenon repaired;
2) detect the internal resistance r of exchanger assembly in water system, if checkout value exceedes the rating value that nameplate marks, then judge that exchanger assembly work is abnormal, keeps in repair it;
3) regulate water pump valve aperture to 90% ~ 100%, if observe plugged filter, then judge that filter can not normally work, to its cleaning or need change.
In described step 1, the method for measurement of the operate power of pump motor comprises two kinds: 1) utilize wattmeter directly to measure; 2) measure its operating voltage U, electric current I, and obtain power factor from nameplate
, utilize
calculate.
In described step 2, to the detection of Nodes water flow, also comprise the detection of the water flow of parts and pipeline junction in whole system, differ by more than pipeline in the node of 3% before and after carrying out measuring to water flow or parts keep in repair.
Beneficial effect
The invention provides a kind of variable water volume system power-economizing method based on the associating of size pump, adopt method provided by the invention by analyzing the working condition of existing water system and rectify and improve, for it chooses suitable new water pump again, water system can be made inefficient, the operating mode of high energy consumption is improved or eliminates, thus improve water system working efficiency, and it is more steady to make pump motor run, heating, vibrations, noise, the phenomenons such as cavitation erosion are effectively suppressed, when solving different operating mode, water pump mates irrational problem with system pipe network, contrast experiment's data, result shows, this method is used can significantly to save water system power consumption, energy-saving effect is remarkable, the new water pump selected not only can meet the demand of current water system, but also remain later extending space, reduce the design and manufacture cost of water system.
Accompanying drawing explanation
Fig. 1 is the structural drawing of certain coke-oven plant's circulation of southwest;
Fig. 2 is the summer condition pipeline schematic diagram of certain coke-oven plant's circulation of southwest;
Fig. 3 is the winter condition pipeline schematic diagram of certain coke-oven plant's circulation of southwest;
Fig. 4 is the operating mode schematic diagram adopting Posterior circle water system of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
As shown in Figure 1, for the structural drawing of certain coke-oven plant's circulation of southwest, Fig. 2 and Fig. 3 is respectively summer condition and the winter condition pipeline schematic diagram of certain coke-oven plant's circulation of southwest, energy-conservation rectification is carried out to this circulation, adopt a kind of variable water volume system power-economizing method based on the associating of size pump of the present invention, comprise the following steps:
Step 1: the operating mode at winter, Xia Liangji measuring existing water system;
(1) the nameplate parameter of water pump and motor;
Water pump nameplate parameter comprises rated flow, rated head, rated speed and necessary electromotor power;
Motor nameplate parameter comprises rated current, voltage rating, rated power, rated speed and power factor;
(2) the operate power P of pump motor;
Adopt wattmeter to measure or measure electric current I, voltage U, power factor
by formulae discovery:
(3) water pump into and out of saliva Nodes liquid pressure, flow velocity and go out saliva node flow Q;
(4) heat-exchange device internal resistance;
Table 1
Step 2: the operating mode recorded according to step 1 detects existing water system pipe network and keeps in repair;
(1) drip phenomenon is emitted to repair to pipe network race.
(2) if heat exchange unit internal resistance overrate, illustrate that heat-exchange device needs to keep in repair.
(3) valve wide open, plugged filter, cleaning or replacing.
(4) in a word, energy dissipation nodes all in pipe network are rectified and improved by most power save mode not affecting under PRODUCTION STATUS.
Step 3: respectively at summer and higher one day of winter temperature, the actual conditions of the water system after acquisition testing and maintenance, namely repeats to measure described in step 1, calculates pump head and pump capacity;
Pump head formula in described step 3 is as follows, and pump head calculated and adopted formula 1 summer, and pump head calculated and adopted formula 2 winter, namely used 1# water pump summer, use in winter 2# water pump:
In formula: p
4, p
3for the pressure of exit of pump, import water Nodes liquid;
V
4, v
3for the flow velocity of pump discharge, inlet's liquid;
△ z is the height difference between pump discharge, inlet pressure meter apparatus;
In formula: p
6, p
5be respectively the pressure of exit of pump header valve water Nodes fluid pressure, import water Nodes liquid behind the door; v
6, v
5for the flow velocity of pump discharge house steward, inlet's liquid;
△ z
cfor the height difference between pump discharge house steward, inlet duct pressure meter apparatus;
∑ h is hydraulic loss, refers to the hydraulic loss of whole device pipe-line system, comprises linear loss h
1with local head loss h
2;
v is flow rate of liquid, and L is the length of straight tube, and d is the caliber of straight tube, and λ is friction loss coefficient, and L is the length of pipeline, and d is the diameter of pipeline, and g is gravity accleration, and ζ is local loosening, and inquiry Moody chart obtains.
By formula (1), determine summer condition, Q gets 1400m
3/ h,
get 52 meters;
By formula (2), determine winter condition, Q gets 850m
3/ h,
h=50 rice;
Step 4: choose exit of pump flow and pump head in the actual conditions met described in step 3 and the water pump in existing water system replaced by the water pump being operated in efficient district;
Change 2 water pumps, operational effect is as table 2:
Table 2
During winter condition, in order to make whole unit operation efficiency in efficient district range of operation, 1 motor need be changed, the replacing of motor is carried out according to the security level of original motor, insulation class, motor model is selected to be Y315L1-4/160KW/380V/289A/0.89/94.5%, 0.89 is the power factor of Rated motor, and 94.5% is the operational efficiency of Rated motor.
Composition graphs 4, contrast table 1 and table 2 can be found out, after adopting the inventive method, the pump capacity of circulation increases, and input power reduces, and energy consumption significantly reduces.
Claims (2)
1., based on a variable water volume system power-economizing method for size pump associating, it is characterized in that, comprise the following steps:
Step 1: measure the operating mode service data of existing water system at winter, Xia Liangji;
Step 2: the operating mode recorded according to step 1 detects existing water system pipe network and keeps in repair, and its process is as follows:
1) detect pump intake place water flow Q in water system
1with the water flow Q of the water outlet of water system pipe network node
2if both differ by more than 3%, then run in decision-making system pipe network, emit, leak and dripping phenomenon serious, check successively from inlet's node to water system pipe network node water outlet, the node that there is this phenomenon repaired;
2) detect the internal resistance r of exchanger assembly in water system, if checkout value exceedes the rating value that nameplate marks, then judge that exchanger assembly work is abnormal, keeps in repair it;
3) regulate water pump valve aperture to 90% ~ 100%, if observe plugged filter, then judge that filter can not normally work, to its cleaning or need change;
Step 3: exceed one day of temperature 4 ° ~ 8 ° same period respectively in summer and winter temperature, the actual conditions of the water system after acquisition testing and maintenance, namely repeats to measure described in step 1, calculates pump head and pump capacity;
Step 4: choose exit of pump flow and pump head in the actual conditions met described in step 3 and the water pump in existing water system replaced by the water pump being operated in high efficiency area of pump operation, and in the winter time operating mode time, in order to make whole unit operation efficiency in efficient district range of operation, also change 1 motor simultaneously;
Described high efficiency area of pump operation refers to and is not less than the efficiency area scope that pump efficiency peak plays decline 5%-8%;
Wherein, in described step 1, the operating mode service data of existing water system comprises:
(1) the nameplate parameter of water pump and motor;
Water pump nameplate parameter comprises rated flow, rated head, rated speed and necessary electromotor power;
Motor nameplate parameter comprises rated current, voltage rating, rated power, rated speed and power factor;
(2) the operate power P of pump motor;
(3) water pump into and out of saliva Nodes liquid pressure, flow velocity and go out saliva node flow Q;
(4) heat-exchange device internal resistance;
Pump head formula in described step 3 is as follows, and pump head calculated and adopted formula 1 summer, and pump head calculated and adopted formula (2) winter:
In formula: p
4, p
3for the pressure of exit of pump, import water Nodes liquid;
V
4, v
3for the flow velocity of pump discharge, inlet's liquid;
△ z is the height difference between pump discharge, inlet pressure meter apparatus;
In formula: p
6, p
5be respectively the pressure of exit of pump header valve water Nodes fluid pressure, import water Nodes liquid behind the door;
V
6, v
5for the flow velocity of pump discharge house steward, inlet's liquid;
△ z
cfor the height difference between pump discharge house steward, inlet duct pressure meter apparatus;
∑ h is hydraulic loss, refers to the hydraulic loss of whole device pipe-line system, comprises linear loss h
1with local head loss h
2;
v is flow rate of liquid, and L is the length of straight tube, and λ is friction loss coefficient, and L is the length of pipeline, and d is the diameter of pipeline, and g is gravity accleration, and ζ is local loosening, and inquiry Moody chart obtains;
In described step 2, to the detection of Nodes water flow, also comprise the detection of the water flow of parts and pipeline junction in whole system, differ by more than pipeline in the node of 3% before and after carrying out measuring to water flow or parts keep in repair.
2. a kind of variable water volume system power-economizing method based on the associating of size pump according to claim 1, it is characterized in that, in described step 1, the method for measurement of the operate power of pump motor comprises two kinds: 1) utilize wattmeter directly to measure; 2) measure its operating voltage U, electric current I, and obtain power factor from nameplate
utilize
calculate.
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| CN201310201346.3A CN103267013B (en) | 2013-05-27 | 2013-05-27 | Variable flow water system energy-saving method based on combination of large pump and small pump |
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|---|---|---|---|
| CN201310201346.3A CN103267013B (en) | 2013-05-27 | 2013-05-27 | Variable flow water system energy-saving method based on combination of large pump and small pump |
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| CN103267013B true CN103267013B (en) | 2016-02-03 |
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| CN109522641A (en) * | 2018-11-14 | 2019-03-26 | 南京腾图节能科技有限公司 | The calculation method of the minimum lift of water pump when a kind of exit of pump valve standard-sized sheet |
| CN115017744B (en) * | 2022-08-08 | 2022-11-18 | 河北建投水务投资有限公司 | Modeling method and system of groundwater source water supply hydraulic calculation model |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4518318A (en) * | 1983-07-07 | 1985-05-21 | Grundfos A/S | Pumping sets |
| GB2314412A (en) * | 1996-06-19 | 1997-12-24 | Richard Czaja | Method of monitoring pump performance |
| CN201763589U (en) * | 2010-04-21 | 2011-03-16 | 上海易齐节能科技有限公司 | High-efficiency dynamic correcting and energy-saving system for working condition point of fluid circulating pump |
| CN102562561A (en) * | 2011-12-27 | 2012-07-11 | 酒泉钢铁(集团)有限责任公司 | Method for analyzing operation energy efficiency of pump set of industrial circulating water system |
-
2013
- 2013-05-27 CN CN201310201346.3A patent/CN103267013B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4518318A (en) * | 1983-07-07 | 1985-05-21 | Grundfos A/S | Pumping sets |
| GB2314412A (en) * | 1996-06-19 | 1997-12-24 | Richard Czaja | Method of monitoring pump performance |
| CN201763589U (en) * | 2010-04-21 | 2011-03-16 | 上海易齐节能科技有限公司 | High-efficiency dynamic correcting and energy-saving system for working condition point of fluid circulating pump |
| CN102562561A (en) * | 2011-12-27 | 2012-07-11 | 酒泉钢铁(集团)有限责任公司 | Method for analyzing operation energy efficiency of pump set of industrial circulating water system |
Non-Patent Citations (1)
| Title |
|---|
| 不同容量循环水泵配置的节能研究;张震伟等;《电力建设》;20120430;第33卷(第4期);76-79 * |
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