CN103075854A - Cooling water circulation pump system - Google Patents
Cooling water circulation pump system Download PDFInfo
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- CN103075854A CN103075854A CN2013100059960A CN201310005996A CN103075854A CN 103075854 A CN103075854 A CN 103075854A CN 2013100059960 A CN2013100059960 A CN 2013100059960A CN 201310005996 A CN201310005996 A CN 201310005996A CN 103075854 A CN103075854 A CN 103075854A
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Abstract
The invention relates to a cooling water circulation pump system. At present, no cooling water circulation pump system with a simple structure, reasonable design, low manufacture cost, capability of flexibly adjusting a circulating water amount, and facility of energy saving and consumption reduction exits. The cooling water circulation pump system comprises at least two circulation pumps which are mutually connected in parallel, and is characterized in that a valve is arranged in the inlet and/or the outlet of each circulation pump; each circulation pump is provided with a same designed lift, but with different designed flows; and a motor with a fixed rotation speed is used for driving each circulation pump to operate at a set speed, thus the cooling water circulation pump system has the function of stepping flow adjustment from the minimum circulation water flow to the maximum circulation water flow, and the requirement for flow adjustment of circulation cooling water in different seasons and different working conditions is met. The cooling water circulation pump system has the advantages of reasonable structure, low manufacture cost, capability of flexibly adjusting the circulating water amount, and facility of energy saving and consumption reduction.
Description
Technical field
The present invention relates to a kind of cooling water circulation pumping system, mainly be applicable in the cooling water system of circulating cooling water of power plant system, Controlling Auxiliaries in Power Plants cooling water system and other industrial circle.
Background technology
In recent years, because coal price sharp rises, so that the cost of electricity-generating of steam power plant increases greatly, and that the rate for incorporation into the power network of steam power plant increases is limited, causes the profit margin of Thermal Power Enterprises more and more less.Reduce cost of electricity-generating, energy efficient has become the domestic demand of electricity power enterprise.
Coal-burning power plant's recirculated cooling water adopts the circulating pump of several parallel runnings to drive usually, for example: 300MW grade generating set cooling water adopts 50% mass flow circulating pump of two parallel connections usually, the 1000MW grade adopts the circulating pump of 35% capacity of three parallel connections, other usually adopt the circulating pump of 50% capacity of two parallel connections such as the subsidiary engine circulating pump.And in actual motion, in order to make unit be issued to best efficiency level at Various Seasonal and different unit loads, circulating water flow need to be regulated accordingly, can be at " optimum vacuum " lower operation, the i.e. optimal balance point of unit back pressure and circulating pump wasted work to keep unit.But because the design comparison of above-mentioned circulating pump system is extensive, the flexible modulation of circulating water flow can't realize.For example open day is on October 10th, 2012, publication number is in the Chinese patent of CN102721245A, a kind of portable Double pump circulation water cooling system is disclosed, this cooling system comprises storage tank, circulating pump, heat abstractor and water circulation pipe, wherein, circulating pump comprises the first circulating pump and the second circulating pump, thereby form two water-flow circuits, although this double-circulation water-cooling but loop can run without interruption when water pump fault or maintenance by support equipment, but regulate the quantity of circulating water underaction, be unfavorable for saving energy and reduce the cost.
The cooling water circulation pumping system that some other structures are also arranged now, as open day be on November 07th, 2012, publication number is in the Chinese patent of CN202522125U, disclose a kind of generating plant circulation-water cooling system, this generating plant circulation-water cooling system comprises circulating pump, condenser, the cooling stack that is connected successively by circulating water pipeline; Wherein recirculated water through after the condenser heating, enters and carries out heat exchange in the cooling stack in circulating water pipeline, and the recirculated water that is cooled splashes in the pond, bottom, flows out by circulating pump; Circulating pump is arranged in the bottom of cooling stack, and the position between two distribution channels, circulating pump is vertical diagonal flow pump, by such layout, not affecting in the normal situation about using of circulating water cooling system, save floor space, the economized cycle waterpipe, but this generating plant circulation-water cooling system is regulated the quantity of circulating water underaction, is unfavorable for saving energy and reduce the cost.
At present, in order to improve the adjusting function of circulation, some power plant have adopted the method for frequency conversion drive circulating pump, can according to the needs of regulating quantity of circulating water, regulate the rotating speed of circulating pump impeller.Although the method has more flexibly advantage of adjusting, but, the investment of big-power transducer equipment is large, safeguard complicated, and when circulating pump when the slow-speed of revolution moves, namely not at the design operating conditions of the best, circulating pump efficient can be subject to certain impact, increased the energy consumption of pump, be unfavorable for saving energy and reduce the cost.
In sum, also do not have at present a kind of simple in structurely, reasonable in design, low cost of manufacture can the flexible modulation quantity of circulating water, the cooling water circulation pumping system that is conducive to save energy and reduce the cost.
Summary of the invention
The object of the invention is to overcome above shortcomings in the prior art, and a kind of reasonable in design is provided, low cost of manufacture can the flexible modulation quantity of circulating water, the cooling water circulation pumping system that is conducive to save energy and reduce the cost.
The present invention addresses the above problem the technical scheme that adopts: this cooling water circulation pumping system comprises at least two circulating pumps parallel with one another, and its design feature is: entrance and/or the outlet of every circulating pump are equipped with valve; Every circulating pump has identical rated lift, but has different design discharges; Every circulating pump all adopts the fixed rotating speed driven by motor, carry out the constant speed operation, so that the cooling water circulation pumping system has the function from minimal circulation discharge to the staged Flow-rate adjustment the largest loop discharge, to satisfy the needs of under Various Seasonal and different operating modes, circulating cooling water flow being regulated.
As preferably, entrance or the outlet of every circulating pump of the present invention are equipped with check-valves.
As preferably, the quantity of circulating pump of the present invention is the 2-20 cover.
As preferably, the present invention is positioned at the entrance of every circulating pump and/or the valve of outlet, standard-sized sheet when corresponding circulating pump starts, full cut-off when corresponding circulating pump stops.
As preferably, valve of the present invention is the electric hydaulic butterfly valve structure.
The present invention compared with prior art has the following advantages and effect: simple in structure, reasonable in design, easy to use, low cost of manufacture can be regulated quantity of circulating water flexibly, is conducive to save energy and reduce the cost, and reduces cost of electricity-generating.
The present invention has unique advantage aspect high-power station's circulation adjusting, be mainly manifested in following aspect: 1, compare with the cooling water circulation pumping system of power plant routine, the quantity of circulating water adjusting function significantly improves, and can realize regulating from maximum stream flow to minimum discharge successive steps formula; 2, the equipment that adopts can all be the conventional water pump that is driven by constant-seed motor, and equipment is reliable, and is safe, and maintenance cost is little; 3, adjusting function improves along with the increase of the quantity of circulating pump, when adopting the circulating pump more than four or four, its adjusting function is similar to the circulating pump that adopts transducer drive to regulate, and when same loop discharge, energy consumption is lower than the employing frequency conversion drive, and energy-saving and cost-reducing performance is remarkable; 4, put into operation after, can realize unmanned, can automatically move.
Among the present invention each circulating pump has identical rated lift and different design discharges, the design discharge of each circulating pump is through optimizing, combination by circulating pump can realize that the staged from required minimal circulation discharge to maximum stream flow regulates, to satisfy the Power Plant needs that circulating cooling water flow is regulated under the different operating modes of Various Seasonal.
The present invention breaks the conventional structure that the capacity such as power plant's circulating pump employing are arranged in parallel, can adopt the identical circulating pump different with mass flow of pressure head through calculating, all circulating pumps adopt the constant speed operation, and the combination of dependence circulating pump realizes the adjusting of circulating water flow.The present invention compares with adopting the conventional circulating pump system that waits capacity to be arranged in parallel, quantity of circulating water is regulated more flexible, can guarantee that unit is moving under the Various Seasonal different load under optimum vacuum, improve the unit efficiency of energy utilization, but and the power consumption of economized cycle pump about 30%.
Description of drawings
Fig. 1 is the structural representation of cooling water circulation pumping system in the embodiment of the invention 1.
Fig. 2 is the structural representation of cooling water circulation pumping system in the embodiment of the invention 2.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and by embodiment, and following examples are explanation of the invention and the present invention is not limited to following examples.
Referring to Fig. 1, the cooling water circulation pumping system in the present embodiment comprises four circulating pumps parallel with one another, and these four circulating pumps are respectively a circulating pump 32, No. two circulating pumps 42, No. three circulating pumps 52 and No. four circulating pumps 62; Entrance and exit at every circulating pump all is equipped with valve, and the valve that is positioned at entrance and exit is respectively inlet valve and outlet valve, and valve is the electric hydaulic butterfly valve structure.Every circulating pump has identical rated lift, but has different design discharges; Every circulating pump all adopts the fixed rotating speed driven by motor, carry out the constant speed operation, so that the cooling water circulation pumping system has the function from minimal circulation discharge to the staged Flow-rate adjustment the largest loop discharge, to satisfy the needs of under Various Seasonal and different operating modes, circulating cooling water flow being regulated.Be positioned at the valve of the entrance and exit of every circulating pump, standard-sized sheet when corresponding circulating pump starts, full cut-off when corresponding circulating pump stops.
Cooling water circulation pumping system in the present embodiment specifically comprises water inlet manifold 1, outfall sewer 2 and quadruplet circulating pump mechanism, every cover circulating pump mechanism includes arm, circulating pump, inlet valve and outlet valve, circulating pump, inlet valve and outlet valve are installed on the arm, circulating pump is between inlet valve and outlet valve, the two ends of arm are connected on water inlet manifold 1 and the outfall sewer 2, so that respectively overlap between the circulating pump mechanism in parallel.
Inlet valve in the present embodiment and outlet valve are the electric hydaulic butterfly valve structure, and each circulating pump that overlaps in the circulating pump mechanism has identical rated lift and different design discharges.When circulating pump started, inlet valve and outlet valve were full-gear; When circulating pump stopped, inlet valve and outlet valve were full-shut position.
Every cover circulating pump of the present invention mechanism can also comprise check-valves, and check-valves is installed on the arm, and this check-valves is positioned at the import department of circulating pump or is positioned at the exit of circulating pump.Import or export at circulating pump arranges check-valves, can more effectively increase the airtight performance of pipeline.Each circulating pump among the present invention adopts the fixed rotating speed motor to drive, to reach the purpose of constant speed operation.
Quadruplet circulating pump mechanism in the present embodiment is respectively a circulating pump mechanism, No. two circulating pump mechanisms, No. three circulating pump mechanisms and No. four circulating pump mechanisms, wherein, No. one circulating pump mechanism comprises an arm 31, a circulating pump 32, an inlet valve 33 and an outlet valve 34, circulating pump 32, inlet valve 33 and outlet valve 34 are installed on arm 31, circulating pump 32 is between inlet valve 33 and outlet valve 34, and the two ends of an arm 1 are connected on water inlet manifold 1 and the outfall sewer 2; No. two circulating pump mechanism comprises No. two arms 41, No. two circulating pumps 42, No. two inlet valves 43 and No. two outlet valves 44, No. two circulating pumps 42, No. two inlet valves 43 and No. two outlet valves 44 are installed on No. two arms 41, No. two circulating pumps 42 are between No. two inlet valves 43 and No. two outlet valves 44, and the two ends of No. two arms 41 are connected on water inlet manifold 1 and the outfall sewer 2; No. three circulating pump mechanism comprises No. three arms 51, No. three circulating pumps 52, No. three inlet valves 53 and No. three outlet valves 54, No. three circulating pumps 52, No. three inlet valves 53 and No. three outlet valves 54 are installed on No. three arms 1, No. three circulating pumps 52 are between No. three inlet valves 53 and No. three outlet valves 54, and the two ends of No. three arms 51 are connected on water inlet manifold 1 and the outfall sewer 2; No. four circulating pump mechanism comprises No. four arms 61, No. four circulating pumps 62, No. four inlet valves 63 and No. four outlet valves 64, No. four circulating pumps 62, No. four inlet valves 63 and No. four outlet valves 64 are installed on No. four arms 61, No. four circulating pumps 62 are between No. four inlet valves 63 and No. four outlet valves 64, and the two ends of No. four arms 61 are connected on water inlet manifold 1 and the outfall sewer 2; Parallel with one another between circulating pump mechanism, No. two circulating pump mechanisms, No. three circulating pump mechanisms and No. four circulating pump mechanisms.
When the coal-fired clammy unit of certain 1000MW of power plant, winter sub-load and summer, required circulating water flow was respectively 33000 tons/hour and 96000 tons/hour at full capacity.The conventional design scheme is the circulating pump of 3 35% capacity of every unit configuration in the prior art, can realize 35%, 70% and 105% flow in the actual motion, and regulating power is limited.Adopt the cooling water circulation pumping system in the present embodiment, adopt the circulating pump of three different capabilities, and increase the circulating pump of a low capacity, namely use a circulating pump 32, No. two circulating pumps 42, No. three circulating pumps 52 and No. four circulating pumps 62.The capacity of a circulating pump 32, No. two circulating pumps 42, No. three circulating pumps 52 and No. four circulating pump 62 these four circulating pumps is respectively 53%, 40%, 27% and 7% of largest loop discharge.A circulating pump 32 in the present embodiment, No. two circulating pumps 42, No. three circulating pumps 52 and No. four circulating pumps 62 adopt respectively #1, #2, #3 and #4 to represent, the concrete method of operation is as shown in table 1.
Table 1 pump operating cycle mode (circulating pump numbering: #1:53%; #2:40%; #3:27%; #4:7%)
| Sequence number | Follow the pump operation mode | Circulating water flow % | Circulating water flow t/ |
| 1 | #3 | 27 | 25600 |
| 2 | #3#4 | 33 | 32000 |
| 3 | #2 | 40 | 38400 |
| 4 | #2#4 | 47 | 44800 |
| 5 | #1 | 53 | 51200 |
| 6 | #1#4 | 60 | 57600 |
| 7 | #2#3 | 67 | 64000 |
| 8 | #2#3#4 | 73 | 70400 |
| 9 | #1#3 | 80 | 76800 |
| 10 | #1#3#4 | 87 | 83200 |
| 11 | #1#2 | 93 | 89600 |
| 12 | #1#2#4 | 100 | 96000 |
| 13 | #1#2#3 | 120 | 115200 |
In service, the cooling water circulation pumping system in the present embodiment can according to the variation flexible modulation circulating water flow of season and load, can satisfy from minimum to the staged Flow-rate adjustment the largest loop discharge.As can be seen from Table 1, the unlatching by circulating pump in service realizes the staged adjusting of circulating water flow from 27% to 100%, and the interval between each flow equates, is 6400t/h.When maximum circulating pump fault withdrawed from, system still can guarantee 74% largest loop discharge, and security of system is not less than conventional design.
Cooling water circulation pumping system among the present invention comprises at least two circulating pumps parallel with one another, and the quantity of circulating pump is generally the 2-20 cover.The present invention can be equipped with check-valves in entrance or the outlet of every circulating pump.The present invention can be equipped with valve in entrance and/or the outlet of every circulating pump, is positioned at the entrance of every circulating pump and/or the valve of outlet, standard-sized sheet when corresponding circulating pump starts, full cut-off when corresponding circulating pump stops.
Referring to Fig. 2, the cooling water circulation pumping system in the present embodiment comprises three circulating pumps parallel with one another, and these three circulating pumps are respectively a circulating pump 32, No. two circulating pumps 42 and No. three circulating pumps 52; Entrance and exit at every circulating pump all is equipped with valve, and the valve that is positioned at entrance and exit is respectively inlet valve and outlet valve, and valve is the electric hydaulic butterfly valve structure.Every circulating pump has identical rated lift, but has different design discharges; Every circulating pump all adopts the fixed rotating speed driven by motor, carry out the constant speed operation, so that the cooling water circulation pumping system has the function from minimal circulation discharge to the staged Flow-rate adjustment the largest loop discharge, to satisfy the needs of under Various Seasonal and different operating modes, circulating cooling water flow being regulated.Be positioned at the valve of the entrance and exit of every circulating pump, standard-sized sheet when corresponding circulating pump starts, full cut-off when corresponding circulating pump stops.
Cooling water circulation pumping system in the present embodiment specifically comprises water inlet manifold 1, outfall sewer 2 and three cover circulating pump mechanisms, every cover circulating pump mechanism includes arm, circulating pump, inlet valve and outlet valve, circulating pump, inlet valve and outlet valve are installed on the arm, circulating pump is between inlet valve and outlet valve, the two ends of arm are connected on water inlet manifold 1 and the outfall sewer 2, so that respectively overlap between the circulating pump mechanism in parallel.
Inlet valve in the present embodiment and outlet valve are the electric hydaulic butterfly valve structure, and each circulating pump that overlaps in the circulating pump mechanism has identical rated lift and different design discharges.Every cover circulating pump of the present invention mechanism can also comprise check-valves, and check-valves is installed on the arm, and this check-valves is positioned at the import department of circulating pump or is positioned at the exit of circulating pump.
In the present embodiment three cover circulating pump mechanism is respectively a circulating pump mechanism, No. two circulating pump mechanisms and No. three circulating pump mechanisms, wherein, No. one circulating pump mechanism comprises an arm 31, a circulating pump 32, an inlet valve 33 and an outlet valve 34, circulating pump 32, inlet valve 33 and outlet valve 34 are installed on arm 31, circulating pump 32 is between inlet valve 33 and outlet valve 34, and the two ends of an arm 1 are connected on water inlet manifold 1 and the outfall sewer 2; No. two circulating pump mechanism comprises No. two arms 41, No. two circulating pumps 42, No. two inlet valves 43 and No. two outlet valves 44, No. two circulating pumps 42, No. two inlet valves 43 and No. two outlet valves 44 are installed on No. two arms 41, No. two circulating pumps 42 are between No. two inlet valves 43 and No. two outlet valves 44, and the two ends of No. two arms 41 are connected on water inlet manifold 1 and the outfall sewer 2; No. three circulating pump mechanism comprises No. three arms 51, No. three circulating pumps 52, No. three inlet valves 53 and No. three outlet valves 54, No. three circulating pumps 52, No. three inlet valves 53 and No. three outlet valves 54 are installed on No. three arms 1, No. three circulating pumps 52 are between No. three inlet valves 53 and No. three outlet valves 54, and the two ends of No. three arms 51 are connected on water inlet manifold 1 and the outfall sewer 2; Parallel with one another between circulating pump mechanism, No. two circulating pump mechanisms and No. three circulating pump mechanisms.
When the coal-fired clammy unit of certain 300MW of power plant, summer and winter design cycle discharge be respectively 37090t/h and 11801t/h.Two 55% circulating pumps of every machine assembly of conventional design scheme in the prior art, summer one machine, two pumps, winter one machine, one pump.Adopt the cooling water circulation pumping system in the present embodiment, the circulating pump of three different capabilities of every machine assembly, the design discharge that these three circulating pumps are respectively a circulating pump 32, No. two circulating pumps 42 and 52, numbers circulating pumps 32 of No. three circulating pumps, No. two circulating pumps 42 and No. three circulating pumps 52 is respectively 60%, 45% and 30% of largest loop discharge.A circulating pump 32, No. two circulating pumps 42 and No. three circulating pumps 52 use respectively #1, #2 and #3 to represent, the concrete method of operation is as shown in table 2.
Table 2 pump operating cycle mode (is followed pump numbering: #1:60%; #2:45%; #3:30%)
| Sequence number | Follow the pump operation mode | Circulating water flow % | Circulating water flow t/ |
| 1 | #3 | 30 | 11127 |
| 2 | #2 | 45 | 16690.5 |
| 3 | #1 | 60 | 22254 |
| 4 | #2#3 | 75 | 27817.5 |
| 5 | #1#3 | 90 | 33381 |
| 6 | #1#2 | 105 | 38944.5 |
| 7 | #1#2#3 | 135 | 50071.5 |
Cooling water circulation pumping system in the present embodiment can be according to the variation flexible modulation circulating water flow of season and load, as can be seen from Table 2, adjusting by circulating pump has realized that the staged of circulating water flow from 30% to 105% regulates, and the interval between each flow equates, is 5563.5t/h.When maximum circulating pump fault withdrawed from, system can guarantee 70% largest loop discharge, and security of system is not less than conventional design.
Cooling water circulation pumping system among the present invention comprises at least two circulating pumps parallel with one another, and the quantity of circulating pump is generally the 2-20 cover.The present invention can be equipped with check-valves in entrance or the outlet of every circulating pump.The present invention can be equipped with valve in entrance and/or the outlet of every circulating pump, is positioned at the entrance of every circulating pump and/or the valve of outlet, standard-sized sheet when corresponding circulating pump starts, full cut-off when corresponding circulating pump stops.
In addition, need to prove, the specific embodiment described in this specification, the shape of its parts and components, institute's title of being named etc. can be different, and the above content described in this specification only is to structure example of the present invention explanation.Allly conceive equivalence variation or the simple change that described structure, feature and principle are done according to patent of the present invention, be included in the protection domain of patent of the present invention.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, all should belong to protection scope of the present invention.
Claims (5)
1. a cooling water circulation pumping system comprises at least two circulating pumps parallel with one another, it is characterized in that: entrance and/or the outlet of every circulating pump are equipped with valve; Every circulating pump has identical rated lift, but has different design discharges; Every circulating pump all adopts the fixed rotating speed driven by motor, carry out the constant speed operation, so that the cooling water circulation pumping system has the function from minimal circulation discharge to the staged Flow-rate adjustment the largest loop discharge, to satisfy the needs of under Various Seasonal and different operating modes, circulating cooling water flow being regulated.
2. cooling water circulation pumping system according to claim 1, it is characterized in that: entrance or the outlet of every circulating pump are equipped with check-valves.
3. cooling water circulation pumping system according to claim 1 is characterized in that: the quantity of described circulating pump is the 2-20 cover.
4. cooling water circulation pumping system according to claim 1 is characterized in that: be positioned at the entrance of every circulating pump and/or the valve of outlet, standard-sized sheet when corresponding circulating pump starts, full cut-off when corresponding circulating pump stops.
5. cooling water circulation pumping system according to claim 1, it is characterized in that: described valve is the electric hydaulic butterfly valve structure.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898630A (en) * | 2015-06-01 | 2015-09-09 | 北京京能未来燃气热电有限公司 | Circulating water optimization system and method |
| CN105215312A (en) * | 2015-09-30 | 2016-01-06 | 宝山钢铁股份有限公司 | A kind of double-roll thin-belt continuous casting roller cooling water flow amount control method |
| CN105858959A (en) * | 2016-05-05 | 2016-08-17 | 华电电力科学研究院 | Open circulating water thermal power plant raw water source device and control method thereof |
| CN109357560A (en) * | 2018-11-07 | 2019-02-19 | 中国能源建设集团浙江省电力设计院有限公司 | A kind of closed-type circulating cooling water system and method for commissioning |
| CN112283107A (en) * | 2020-10-13 | 2021-01-29 | 江西闪石压缩机节能科技有限公司 | Screw compressor heat recovery waterway system |
| CN113280555A (en) * | 2021-04-13 | 2021-08-20 | 华电电力科学研究院有限公司 | Cooling water system of thermal power plant and cooling water adjusting method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898630A (en) * | 2015-06-01 | 2015-09-09 | 北京京能未来燃气热电有限公司 | Circulating water optimization system and method |
| CN105215312A (en) * | 2015-09-30 | 2016-01-06 | 宝山钢铁股份有限公司 | A kind of double-roll thin-belt continuous casting roller cooling water flow amount control method |
| CN105858959A (en) * | 2016-05-05 | 2016-08-17 | 华电电力科学研究院 | Open circulating water thermal power plant raw water source device and control method thereof |
| CN109357560A (en) * | 2018-11-07 | 2019-02-19 | 中国能源建设集团浙江省电力设计院有限公司 | A kind of closed-type circulating cooling water system and method for commissioning |
| CN112283107A (en) * | 2020-10-13 | 2021-01-29 | 江西闪石压缩机节能科技有限公司 | Screw compressor heat recovery waterway system |
| CN113280555A (en) * | 2021-04-13 | 2021-08-20 | 华电电力科学研究院有限公司 | Cooling water system of thermal power plant and cooling water adjusting method |
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| CN103075854B (en) | 2015-05-20 |
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