CN112963736A - Secondary distribution network deep energy-saving diving system and method for heat supply network circulating water pump - Google Patents
Secondary distribution network deep energy-saving diving system and method for heat supply network circulating water pump Download PDFInfo
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- CN112963736A CN112963736A CN202110196871.5A CN202110196871A CN112963736A CN 112963736 A CN112963736 A CN 112963736A CN 202110196871 A CN202110196871 A CN 202110196871A CN 112963736 A CN112963736 A CN 112963736A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000009189 diving Effects 0.000 title claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 abstract description 12
- 238000009412 basement excavation Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of industrial circulating water energy conservation, and particularly relates to a deep energy-saving excavation and submergence method for a secondary distribution network of a heat supply network circulating water pumpGo outOutlet main pipe pressure PFemaleOutlet flow Q of heat supply network circulating water pump and efficiency eta of heat supply network circulating water pumpPump and method of operating the sameAnd efficiency eta of heat supply network circulating water pump motorElectric machineCounting the operation modes of the heat supply network circulating water pump at the initial stage, the middle stage and the final stage of heat supply; calculating the surplus lift of the heat supply network circulating water pump and the throttling loss power of an outlet door; according to the actual measurement of the surplus lift of the water pumpAnd determining whether the system continues to operate in the original mode or the deep energy-saving excavation and submergence transformation of the secondary distribution network of the heat supply network circulating water pump is carried out according to the throttling loss power of the outlet door, and carrying out cutting transformation on the original pump impeller. The invention solves the problem of pump overcurrent in the operation of the original system, obviously reduces the unit consumption of the heat supply network circulating water pump in operation and has obvious energy-saving effect.
Description
Technical Field
The invention belongs to the technical field of industrial circulating water energy conservation, and particularly relates to a deep energy-saving excavation and submergence method for a secondary distribution network of a heat supply network circulating water pump.
Background
Some enterprises for centralized heating in cities are seriously throttled by the outlet door of the circulating water pump of the heat supply network for a long time, and the operation unit consumption of the pump is high, mainly because the allowance of the pump set type selection is large in the initial design and construction stages of the heat supply network system, and the resistance characteristics of the pump set and the pipe network system are not matched.
The pump outlet opening degree existing in the operation of the original heat supply network circulating water pump can cause the motor overcurrent, the pump outlet opening degree is forced to be reduced for a long time for throttling operation, the pump is controlled in a working area by a method of increasing the system resistance, the problems that the unit consumption of the operation pump is high, the tile temperature of some pump groups is high and the like are caused, and the operation safety of equipment is influenced are caused.
Disclosure of Invention
The invention provides a deep energy-saving excavation and submergence method for a secondary distribution network of a heat supply network circulating water pump, which solves the problem of high unit consumption of water pump throttling operation.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a net is joined in marriage deeply energy-conserving submerged system that digs to heat supply network circulating water pump's secondary, including heat supply network circulating water pump, heat supply network circulating water pump's female pipe of access connection return water, the female pipe of exit linkage export of heat supply network circulating water pump, be equipped with heat supply network circulating water pump entry door on the female pipe of return water, heat supply network circulating water pump entry door passes through the entry manometer and connects the entry at heat supply network circulating water pump, be equipped with the female pipe manometer of export on the female pipe of export, the female pipe manometer of export loops through heat supply network circulating water pump exit door, the export manometer is connected.
A secondary distribution network deep energy-saving diving method of a heat supply network circulating water pump comprises the following steps:
s1, testing the resistance characteristics of the central heating pipe network system in the initial stage, the middle stage and the final stage of heating, and testing the outlet pressure P of the heat supply network circulating water pumpGo outOutlet main pipe pressure PFemaleOutlet flow Q of heat supply network circulating water pump and efficiency eta of heat supply network circulating water pumpPump and method of operating the sameAnd efficiency eta of heat supply network circulating water pump motorElectric machineCounting the operation modes of the heat supply network circulating water pump at the initial stage, the middle stage and the final stage of heat supply;
s2, calculating the surplus lift of the heat supply network circulating water pump according to the actually measured resistance characteristic curve of the heat supply network system and the flow-lift curve of the pumpΔH＝(PGo out-PFemale)×100；
S3, calculating the throttle loss power of the outlet gate of the heat supply network circulating water pump according to the actually measured resistance characteristic curve of the heat supply network system and the flow-lift curve of the pump
S4, when the surplus lift of the pump is less than 20m of water column or the throttling loss power of the single pump is less than 30kW, the original mode operation is maintained; when the surplus pump lift of the pump is more than or equal to 20m of water column or the throttling loss power of a single pump is more than or equal to 30kW, the original pump set and a pipe network system are utilized to carry out secondary matching deep energy-saving reconstruction on the heat supply network circulating water pump, the original pump impeller is cut and reconstructed, the impeller cutting amount is calculated according to the calculated surplus pump lift, the maximum cutting amount of the impeller is not more than 20 percent of the diameter of the original impeller, the original two end guard plates of the impeller are kept unchanged in height during cutting, only the middle tongue of the impeller is cut,
amount of impeller cut
Wherein: h, designing the lift of a heat supply network circulating water pump;
delta H is surplus lift of a heat supply network circulating water pump;
d, the diameter of an impeller before cutting of the heat supply network circulating water pump;
and S5, debugging the system again after cutting.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes the original pump set, valves and other equipment of the heat supply network system and the pipe network system, quantifies the surplus lift of the water pump and the throttle loss power of the outlet door of the pump by calculating and testing actual operation parameters, and determines whether to continue to maintain the original mode operation of the system or carry out the deep energy-saving excavation and diving transformation of the secondary distribution network of the heat supply network circulating water pump according to the actually measured surplus lift of the water pump and the throttle loss power of the outlet door. The improved cutting water pump impeller keeps the height of the original guard plate of the impeller unchanged, achieves the purpose of reducing the original surplus lift of the water pump, ensures that the original efficiency of the water pump is not changed greatly, and solves the problem of pump overcurrent existing in the operation of the original heat network system. The opening of the outlet door is increased after the transformation, so that the throttling loss of the outlet door of the pump is reduced, the unit consumption of the operation of the heat supply network circulating water pump is obviously reduced, and the operation safety of the system is improved. The energy-saving excavation and potential transformation is small in investment, quick in effect and convenient to implement on site.
Drawings
FIG. 1 is a schematic structural diagram of a secondary distribution network deep energy-saving diving system of a heat supply network circulating water pump;
fig. 2 is a graph comparing the performance curve of the heat supply network circulating water pump before and after modification with the resistance characteristic curve.
Wherein: 1-heat supply network circulating water pump; 2-inlet door of circulating water pump of heat supply network; 3-outlet door of heat supply network circulating water pump; 4-outlet pressure gauge; 5-inlet pressure gauge; 6-outlet main pipe pressure gauge; 7-a water return main pipe; 8-outlet header.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a system that net is joined in marriage deeply to energy-conserving excavation and dive is joined in marriage to heat supply network circulating water pump secondary, including heat supply network circulating water pump 1, female pipe 7 of entry linkage return water of heat supply network circulating water pump 1, female pipe 8 of exit linkage export of heat supply network circulating water pump 1, be equipped with heat supply network circulating water pump entry door 2 on the female pipe 7 of return water, heat supply network circulating water pump entry door 2 passes through the entry manometer 5 and connects the entry at heat supply network circulating water pump 1, be equipped with female pipe manometer 6 of export on the female pipe 8 of export, female pipe manometer 6 of export loops through heat supply network circulating water pump export door 3, the export manometer 4 of export is connected in the export.
The working steps of the invention are as follows:
and testing the resistance characteristics of the central heating pipeline network system at the initial stage, the middle stage and the final stage of heat supply, testing the flow-lift curve of the heat supply network circulating water pump, corresponding parameters of the pump motor current, the pump outlet opening and the like, and counting the operation modes of the heat supply network circulating water pump at the initial stage, the middle stage and the final stage of heat supply.
And (4) calculating the surplus lift and the outlet door throttling loss power of the heat supply network circulating water pump according to the actually measured resistance characteristic curve of the heat supply network system and the flow-lift curve of the pump.
Residual lift Δ H ═ P (P)Go out-PFemale)×100 (m)；
Wherein: pGo out-heat network circulating water pump outlet pressure (MPa);
PfemaleOutlet header pressure (MPa).
Power loss by throttling
Wherein: q-outlet flow (m) of circulating water pump of heat supply network3/h)；
ηPump and method of operating the same-heat network circulating water pump efficiency (%);
ηelectric machine-heat network circulating water pump motor efficiency (%).
When the surplus lift of the pump is less than 20m of water column or the throttling loss power of the single pump is less than 30kW, the original mode operation is maintained; when the surplus lift of the pump is more than or equal to 20m of water column or the throttling loss power of a single pump is more than or equal to 30kW, the heat supply network circulating water pump is subjected to secondary matching deep energy-saving transformation by utilizing the original pump set and the original pipe network system.
The heat supply network system adopts more horizontal split centrifugal pumps, mostly low-specific-speed pumps, adopts a similar theory, performs cutting transformation on an original pump impeller, calculates the cutting amount of the impeller according to the calculated surplus lift, and ensures that the maximum cutting amount of the impeller does not exceed 20% of the diameter of the original impeller.
Amount of impeller cut
In the formula: h, design lift (m) of a heat supply network circulating water pump;
delta H is surplus lift (m) of a heat supply network circulating water pump;
d, the diameter (mm) of an impeller before cutting of the heat supply network circulating water pump.
The original two-end guard plates of the impeller are kept unchanged in height during cutting, only the middle tongue of the impeller is cut, water flow disturbance after the impeller of the pump is cut is reduced, and the efficiency of the water pump after modification is guaranteed. The cutting amount of the impeller is not more than 20% of the original impeller diameter at most. The change relation of the flow, the lift and the power of the water pump before and after impeller cutting is as follows:
in the formula: q is the flow before the cutting of the pump impeller, and Q' is the flow after the cutting of the pump impeller;
h-the lift before cutting the pump impeller, H' -the lift after cutting the pump impeller;
n is the power before the cutting of the pump impeller, and N' is the power after the cutting of the pump impeller;
d is the diameter of the impeller before the impeller is cut, and D' is the diameter of the impeller after the impeller is cut.
And debugging the system again after the transformation. Because the surplus lift of the water pump is reduced by transformation, the running current of the pump is obviously reduced, and the problem of the overcurrent of the pump of the original system is solved. During debugging, the flow of the running pump is increased by gradually opening the opening of the large pump outlet, the throttling loss of the pump is reduced due to the increase of the opening of the outlet door, the running unit consumption of the heat supply network circulating water pump is obviously reduced, the energy-saving effect is obvious, and the system safety is improved. And accounting economic benefits before and after transformation.
Power saving
Annual electric quantity Δ W ═ Δ N × h (kW · h);
in the formula: I. i' -respectively is the running current (A) of the pump motor before and after the impeller cutting;
U-Motor input Voltage (V);
h-the number of hours the pump operates in the year.
As shown in fig. 2, curve i is a characteristic curve of the water pump before modification by impeller cutting, curve ii is a characteristic curve of the water pump after modification by impeller cutting, curve 1 is a characteristic curve of resistance before modification by impeller cutting, and curve 2 is a characteristic curve of resistance after modification by impeller cutting.
Before the energy-saving excavation and transformation of the heat supply network circulating water system, a characteristic curve I of a heat supply network circulating water pump intersects with a characteristic curve 1 of resistance in a throttling state at M1, and the point is the working point of the throttling state pump. After the heat supply network circulating water pump impeller is cut and modified, according to a similar theory, the characteristic curve of the water pump is moved down to a curve II, and the characteristic curve of the resistance of the outlet door of the large pump is slowly moved down to a curve 2, and intersects with the curve II at M2, so that the characteristic curve is the working point of the modified pump. The resistance characteristic curve is steeper before modification and becomes gentler after modification and adjustment. The difference of the lifts corresponding to the two points M1 and M2 is not only the surplus lift reduced by the transformation.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (2)
1. The utility model provides a net is joined in marriage deeply energy-conserving latent system that digs to heat supply network circulating water pump's secondary, includes heat supply network circulating water pump (1), its characterized in that: the heat supply network circulating water pump system is characterized in that an inlet of the heat supply network circulating water pump (1) is connected with a return water female pipe (7), an outlet of the heat supply network circulating water pump (1) is connected with an outlet female pipe (8), a heat supply network circulating water pump inlet door (2) is arranged on the return water female pipe (7), the heat supply network circulating water pump inlet door (2) is connected with an inlet of the heat supply network circulating water pump (1) through an inlet pressure gauge (5), an outlet female pipe pressure gauge (6) is arranged on the outlet female pipe (8), and the outlet female pipe pressure gauge (6) is connected with an outlet of the heat supply network circulating water pump (1) through a heat supply network circulating water pump outlet door (3) and an.
2. The energy-saving deep diving method for the secondary distribution network of the heat supply network circulating water pump as claimed in claim 1, characterized by comprising the following steps:
s1, testing the resistance characteristics of the central heating pipe network system in the initial stage, the middle stage and the final stage of heating, and testing the outlet pressure P of the heat supply network circulating water pumpGo outOutlet main pipe pressure PFemaleOutlet flow Q of heat supply network circulating water pump and efficiency eta of heat supply network circulating water pumpPump and method of operating the sameAnd efficiency eta of heat supply network circulating water pump motorElectric machineCounting the operation modes of the heat supply network circulating water pump at the initial stage, the middle stage and the final stage of heat supply;
s2, calculating the surplus lift delta H of the heat supply network circulating water pump according to the actually measured resistance characteristic curve of the heat supply network system and the flow-lift curve of the pump (P ═ H ═ P-Go out-PFemale)×100；
S3, calculating the throttle loss power of the outlet gate of the heat supply network circulating water pump according to the actually measured resistance characteristic curve of the heat supply network system and the flow-lift curve of the pump
S4, when the surplus lift of the pump is less than 20m of water column or the throttling loss power of the single pump is less than 30kW, the original mode operation is maintained; when the surplus pump lift of the pump is more than or equal to 20m of water column or the throttling loss power of a single pump is more than or equal to 30kW, the original pump set and a pipe network system are utilized to carry out secondary matching deep energy-saving reconstruction on the heat supply network circulating water pump, the original pump impeller is cut and reconstructed, the impeller cutting amount is calculated according to the calculated surplus pump lift, the maximum cutting amount of the impeller is not more than 20 percent of the diameter of the original impeller, the original two end guard plates of the impeller are kept unchanged in height during cutting, only the middle tongue of the impeller is cut,
amount of impeller cut
Wherein: h, designing the lift of a heat supply network circulating water pump;
delta H is surplus lift of a heat supply network circulating water pump;
d, the diameter of an impeller before cutting of the heat supply network circulating water pump;
and S5, debugging the system again after cutting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110196871.5A CN112963736A (en) | 2021-02-22 | 2021-02-22 | Secondary distribution network deep energy-saving diving system and method for heat supply network circulating water pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110196871.5A CN112963736A (en) | 2021-02-22 | 2021-02-22 | Secondary distribution network deep energy-saving diving system and method for heat supply network circulating water pump |
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| CN112963736A true CN112963736A (en) | 2021-06-15 |
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| CN101994704A (en) * | 2010-10-26 | 2011-03-30 | 浙江佳力科技股份有限公司 | Chemical process intelligent pump and control method thereof |
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-
2021
- 2021-02-22 CN CN202110196871.5A patent/CN112963736A/en active Pending
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Application publication date: 20210615 |