CN103075854B - Cooling water circulation pump system - Google Patents
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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, be mainly 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, the cost of electricity-generating of steam power plant is increased greatly, and the rate for incorporation into the power network of steam power plant increase limited, causes the profit margin of Thermal Power Enterprises more and more less.Reduce cost of electricity-generating, save energy consumption, 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, such as: 300MW grade generating set cooling water adopts two 50% mass flow circulating pumps in parallel usually, 1000MW grade adopts the circulating pump of three 35% capacity in parallel, other usually adopt the circulating pump of two 50% capacity in parallel as subsidiary engine circulating pump.And in actual motion, best efficiency level is issued in Various Seasonal and different unit load in order to make unit, circulating water flow needs to regulate accordingly, can run, i.e. the optimal balance point of unit back pressuce and circulating pump wasted work to maintain unit under " optimum vacuum ".But because the design comparison of above-mentioned circulating pump system is extensive, the flexible modulation of circulating water flow cannot realize.Such as publication date is on October 10th, 2012, publication number is in the Chinese patent of CN102721245A, disclose a kind of portable Double pump circulation water cooling system, 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, thus form two water-flow circuits, although this double-circulation water-cooling but loop can run without interruption when fault of water pump or maintenance by support equipment, but regulate quantity of circulating water underaction, be unfavorable for saving energy and reduce the cost.
Also there is now the cooling water circulation pumping system of some other structures, if publication date is 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 the circulating pump, condenser, the cooling stack that are connected successively by circulating water pipeline; Wherein recirculated water in circulating water pipeline after condenser heating, enter in cooling stack and carry out heat exchange, in pond, cooled recirculated water instillation bottom, flow 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, when not affecting circulating water cooling system and normally using, save floor space, save circulating water pipeline, but this generating plant circulation-water cooling system regulates 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 employed the method for frequency conversion drive circulating pump, according to the needs regulating quantity of circulating water, can regulate the rotating speed of circulating pump impeller.Although the method has adjustment advantage more flexibly, but, the investment of big-power transducer equipment is large, safeguard complicated, and when circulating pump runs in the slow-speed of revolution, namely not at the design operating conditions of the best, circulating pump efficiency can be subject to certain impact, add the energy consumption of pump, be unfavorable for saving energy and reduce the cost.
In sum, also do not have a kind of structure simple at present, reasonable in design, low cost of manufacture, can flexible modulation quantity of circulating water, is conducive to the cooling water circulation pumping system of saving energy and reduce the cost.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and a kind of reasonable in design is provided, low cost of manufacture, can flexible modulation quantity of circulating water, be conducive to the cooling water circulation pumping system of saving energy and reduce the cost.
The present invention's adopted technical scheme that solves the problem is: 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 platform circulating pump are provided with valve; Every platform circulating pump has identical rated lift, but has different design discharges; Every platform circulating pump all adopts fixed rotating speed driven by motor, carry out constant speed operation, by the combination of circulating pump make cooling water circulation pumping system to have from minimal circulation discharge to largest loop discharge the function of staged Flow-rate adjustment, to meet under Various Seasonal and different operating mode the needs that circulating cooling water flow regulates;
When the coal-fired wet type cooling unit of power plant 1000MW, winter sub-load and summer required at full capacity circulating water flow be respectively 33000 tons/hour and 96000 tons/hour, adopt the circulating pump of three different capabilities, and increase the circulating pump of a low capacity, namely a circulating pump is used, No. two circulating pumps, No. three circulating pumps and No. four circulating pumps, a circulating pump, No. two circulating pumps, the capacity of No. three circulating pumps and No. four these four circulating pumps of circulating pump is respectively 53% of largest loop discharge, 40%, 27% and 7%, a circulating pump, No. two circulating pumps, No. three circulating pumps and No. four circulating pumps adopt #1 respectively, #2, #3 and #4 represents, carrying out practically mode is as shown in table 1,
Table 1 pump operating cycle mode (number: #1:53% by circulating pump; #2:40%; #3:27%; #4:7%)
| Sequence number | Follow pump operation mode | Circulating water flow % | Circulating water flow t/h |
| 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 |
Realize the staged of circulating water flow from 27% to 120% by the unlatching of circulating pump to regulate;
When the coal-fired wet type cooling unit of power plant 300MW, summer and winter design cycle discharge be respectively 37090t/h and 11801t/h, the circulating pump of every platform machine assembly three different capabilities, these three circulating pumps are respectively a circulating pump, No. two circulating pumps and No. three circulating pumps, the design discharge of circulating pump, No. two circulating pumps and No. three circulating pumps is respectively 60%, 45% and 30% of largest loop discharge, a circulating pump, No. two circulating pumps and No. three circulating pumps use #1, #2 and #3 to represent respectively, carrying out practically mode is as shown in table 2
Table 2 pump operating cycle mode (follows pump numbering: #1:60%; #2:45%; #3:30%)
| Sequence number | Follow pump operation mode | Circulating water flow % | Circulating water flow t/h |
| 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 |
Achieve the staged of circulating water flow from 30% to 135% by the adjustment of circulating pump to regulate.
As preferably, entrance or the outlet of the every platform circulating pump of the present invention are provided with check-valves.
As preferably, the present invention is positioned at every entrance of platform circulating pump and/or the valve of outlet, the standard-sized sheet when corresponding circulating pump starts, the full cut-off when corresponding circulating pump stops.
As preferably, valve of the present invention is electric hydaulic butterfly valve structure.
The present invention compared with prior art, has the following advantages and effect: structure is simple, and reasonable in design, easy to use, low cost of manufacture, can regulate quantity of circulating water flexibly, is conducive to saving energy and reduce the cost, and reduces cost of electricity-generating.
The present invention has unique advantage in high-power station's circulation adjustment, be mainly manifested in following aspect: 1, compared with the cooling water circulation pumping system of power plant's routine, quantity of circulating water adjusting function significantly improves, and can realize regulating from maximum stream flow to minimum discharge continuously graded; 2, the equipment adopted can be all the conventional water pump driven by constant-seed motor, and equipment is reliable, and security is high, and maintenance cost is little; 3, adjusting function improves along with the increase of the quantity of circulating pump, when adopting the circulating pump of more than four or four, its adjusting function is similar to the circulating pump adopting transducer drive to regulate, and when same loop discharge, energy consumption is lower than employing frequency conversion drive, and energy-saving and cost-reducing performance is remarkable; 4, after putting into operation, can unmanned be realized, can automatically run.
Each circulating pump in the present invention has identical rated lift and different design discharges, the design discharge of each circulating pump is through optimizing, the staged that can be realized from required minimal circulation discharge to maximum stream flow by the combination of circulating pump is regulated, to meet the Power Plant needs that circulating cooling water flow regulates under the different operating mode 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, the identical circulating pump different with mass flow of pressure head through calculating can be adopted, all circulating pumps adopt constant speed to run, and rely on the combination of circulating pump to realize the adjustment of circulating water flow.The present invention is compared with the circulating pump system waiting capacity to be arranged in parallel adopting routine, quantity of circulating water regulates more flexible, can ensure that unit runs under Various Seasonal different load under optimum vacuum, improve unit efficiency of energy utilization, and the power consumption of circulating pump about 30% can be saved.
Accompanying drawing explanation
Fig. 1 is the structural representation of cooling water circulation pumping system in the embodiment of the present invention 1.
Fig. 2 is the structural representation of cooling water circulation pumping system in the embodiment of the present invention 2.
Detailed description of the invention
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment 1.
See 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; All be provided with valve at the entrance and exit of every platform circulating pump, the valve being positioned at entrance and exit is respectively inlet valve and outlet valve, and valve is electric hydaulic butterfly valve structure.Every platform circulating pump has identical rated lift, but has different design discharges; Every platform circulating pump all adopts fixed rotating speed driven by motor, carry out constant speed operation, make cooling water circulation pumping system to have from minimal circulation discharge to largest loop discharge the function of staged Flow-rate adjustment, to meet under Various Seasonal and different operating mode the needs that circulating cooling water flow regulates.Be positioned at the valve of the entrance and exit of every platform circulating pump, the standard-sized sheet when corresponding circulating pump starts, the 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 four cover circulating pump mechanisms, Mei Tao circulating pump mechanism includes arm, circulating pump, inlet valve and outlet valve, circulating pump, inlet valve and outlet valve are installed on arm, circulating pump is between inlet valve and outlet valve, the two ends of arm are connected on water inlet manifold 1 and outfall sewer 2, make between Ge Tao circulating pump mechanism in parallel.
Inlet valve in the present embodiment and outlet valve are electric hydaulic butterfly valve structure, and the circulating pump in Ge Tao circulating pump mechanism has identical rated lift and different design discharges.When circulating pump starts, inlet valve and outlet valve are full-gear; When circulating pump stops, inlet valve and outlet valve are full-shut position.
Mei Tao circulating pump mechanism of the present invention can also comprise check-valves, and check-valves is arranged on arm, and this check-valves is positioned at the import department of circulating pump or is positioned at the exit of circulating pump.Check-valves is set at the import or export of circulating pump, more effectively can increases the airtight performance of pipeline.Each circulating pump in the present invention adopts fixed rotating speed motor to drive, to reach the object that constant speed is run.
Four cover circulating pump mechanisms in the present embodiment are respectively a circulating pump mechanism, No. two circulating pump mechanisms, No. three circulating pump mechanisms and No. four circulating pump mechanisms, wherein, a circulating pump mechanism comprises an arm 31, circulating pump 32, inlet valve 33 and an outlet valve 34, a circulating pump 32, inlet valve 33 and an outlet valve 34 are installed on an arm 31, a circulating pump 32 is between an inlet valve 33 and an outlet valve 34, and the two ends of an arm 1 are connected on water inlet manifold 1 and outfall sewer 2; No. two circulating pump mechanisms comprise 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 outfall sewer 2; No. three circulating pump mechanisms comprise 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 outfall sewer 2; No. four circulating pump mechanisms comprise 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 outfall sewer 2; Circulating pump mechanism, No. two circulating pump mechanisms, parallel with one another between No. three circulating pump mechanisms and No. four circulating pump mechanisms.
When the coal-fired wet type cooling unit of certain power plant 1000MW, winter sub-load and summer required at full capacity circulating water flow be respectively 33000 tons/hour and 96000 tons/hour.In prior art, conventional design layout is the circulating pump of every platform crew qiting 3 35% capacity, and can realize 35%, 70% and 105% flow in actual motion, 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 these four circulating pumps of circulating pump 62 is respectively 53%, 40%, 27% and 7% of largest loop discharge.32, No. two circulating pumps of a circulating pump in the present embodiment, 42, No. three circulating pumps 52 and No. four circulating pumps 62 adopt #1, #2, #3 and #4 to represent respectively, and carrying out practically mode is as shown in table 1.
Table 1 pump operating cycle mode (number: #1:53% by circulating pump; #2:40%; #3:27%; #4:7%)
| Sequence number | Follow pump operation mode | Circulating water flow % | Circulating water flow t/h |
| 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 operation, the cooling water circulation pumping system in the present embodiment according to the change flexible modulation circulating water flow of season and load, can be able to meet from minimum staged Flow-rate adjustment to largest loop discharge.As can be seen from Table 1, realize the staged of circulating water flow from 27% to 100% by the unlatching of circulating pump in operation and regulate, the interval between each flow is equal, is 6400t/h.When a maximum circulating pump fault exits, system still can ensure the largest loop discharge of 74%, and security of system is not less than conventional design.
Cooling water circulation pumping system in the present invention comprises at least two circulating pumps parallel with one another, and the quantity of circulating pump is generally 2-20 cover.The present invention can be provided with check-valves at the entrance of every platform circulating pump or outlet.The present invention can be provided with valve at the entrance of every platform circulating pump and/or outlet, is positioned at every entrance of platform circulating pump and/or the valve of outlet, the standard-sized sheet when corresponding circulating pump starts, the full cut-off when corresponding circulating pump stops.
Embodiment 2.
See 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; All be provided with valve at the entrance and exit of every platform circulating pump, the valve being positioned at entrance and exit is respectively inlet valve and outlet valve, and valve is electric hydaulic butterfly valve structure.Every platform circulating pump has identical rated lift, but has different design discharges; Every platform circulating pump all adopts fixed rotating speed driven by motor, carry out constant speed operation, make cooling water circulation pumping system to have from minimal circulation discharge to largest loop discharge the function of staged Flow-rate adjustment, to meet under Various Seasonal and different operating mode the needs that circulating cooling water flow regulates.Be positioned at the valve of the entrance and exit of every platform circulating pump, the standard-sized sheet when corresponding circulating pump starts, the 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, Mei Tao circulating pump mechanism includes arm, circulating pump, inlet valve and outlet valve, circulating pump, inlet valve and outlet valve are installed on arm, circulating pump is between inlet valve and outlet valve, the two ends of arm are connected on water inlet manifold 1 and outfall sewer 2, make between Ge Tao circulating pump mechanism in parallel.
Inlet valve in the present embodiment and outlet valve are electric hydaulic butterfly valve structure, and the circulating pump in Ge Tao circulating pump mechanism has identical rated lift and different design discharges.Mei Tao circulating pump mechanism of the present invention can also comprise check-valves, and check-valves is arranged on arm, and this check-valves is positioned at the import department of circulating pump or is positioned at the exit of circulating pump.
Three cover circulating pump mechanisms in the present embodiment are respectively a circulating pump mechanism, No. two circulating pump mechanisms and No. three circulating pump mechanisms, wherein, a circulating pump mechanism comprises an arm 31, circulating pump 32, inlet valve 33 and an outlet valve 34, a circulating pump 32, inlet valve 33 and an outlet valve 34 are installed on an arm 31, a circulating pump 32 is between an inlet valve 33 and an outlet valve 34, and the two ends of an arm 1 are connected on water inlet manifold 1 and outfall sewer 2; No. two circulating pump mechanisms comprise 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 outfall sewer 2; No. three circulating pump mechanisms comprise 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 outfall sewer 2; Circulating pump mechanism, parallel with one another between No. two circulating pump mechanisms and No. three circulating pump mechanisms.
When the coal-fired wet type cooling unit of certain power plant 300MW, summer and winter design cycle discharge be respectively 37090t/h and 11801t/h.Conventional design layout every platform machine assembly two 55% circulating pumps in prior art, summer one machine two pump, winter one machine one pump.Adopt the cooling water circulation pumping system in the present embodiment, the circulating pump of every platform machine assembly three different capabilities, the design discharge that these three circulating pumps are respectively a circulating pump 32, No. two circulating pumps 42 and No. three circulating pump 52, circulating pump, 32, 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 #1, #2 and #3 to represent respectively, and carrying out practically mode is as shown in table 2.
Table 2 pump operating cycle mode (follows pump numbering: #1:60%; #2:45%; #3:30%)
| Sequence number | Follow pump operation mode | Circulating water flow % | Circulating water flow t/h |
| 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 according to the change flexible modulation circulating water flow of season and load, as can be seen from Table 2, achieve the staged of circulating water flow from 30% to 105% by the adjustment of circulating pump to regulate, interval between each flow is equal, is 5563.5t/h.When a maximum circulating pump fault exits, system can ensure the largest loop discharge of 70%, and security of system is not less than conventional design.
Cooling water circulation pumping system in the present invention comprises at least two circulating pumps parallel with one another, and the quantity of circulating pump is generally 2-20 cover.The present invention can be provided with check-valves at the entrance of every platform circulating pump or outlet.The present invention can be provided with valve at the entrance of every platform circulating pump and/or outlet, is positioned at every entrance of platform circulating pump and/or the valve of outlet, the standard-sized sheet when corresponding circulating pump starts, the full cut-off when corresponding circulating pump stops.
In addition, it should be noted that, the specific embodiment described in this description, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this description is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (4)
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 platform circulating pump are provided with valve; Every platform circulating pump has identical rated lift, but has different design discharges; Every platform circulating pump all adopts fixed rotating speed driven by motor, carry out constant speed operation, by the combination of circulating pump make cooling water circulation pumping system to have from minimal circulation discharge to largest loop discharge the function of staged Flow-rate adjustment, to meet under Various Seasonal and different operating mode the needs that circulating cooling water flow regulates;
When the coal-fired wet type cooling unit of power plant 1000MW, winter sub-load and summer required at full capacity circulating water flow be respectively 33000 tons/hour and 96000 tons/hour, adopt the circulating pump of three different capabilities, and increase the circulating pump of a low capacity, namely a circulating pump is used, No. two circulating pumps, No. three circulating pumps and No. four circulating pumps, a circulating pump, No. two circulating pumps, the capacity of No. three circulating pumps and No. four these four circulating pumps of circulating pump is respectively 53% of largest loop discharge, 40%, 27% and 7%, a circulating pump, No. two circulating pumps, No. three circulating pumps and No. four circulating pumps adopt #1 respectively, #2, #3 and #4 represents, carrying out practically mode is as shown in table 1,
Table 1 pump operating cycle mode (number: #1:53% by circulating pump; #2:40%; #3:27%; #4:7%)
Realize the staged of circulating water flow from 27% to 120% by the unlatching of circulating pump to regulate;
When the coal-fired wet type cooling unit of power plant 300MW, summer and winter design cycle discharge be respectively 37090t/h and 11801t/h, the circulating pump of every platform machine assembly three different capabilities, these three circulating pumps are respectively a circulating pump, No. two circulating pumps and No. three circulating pumps, the design discharge of circulating pump, No. two circulating pumps and No. three circulating pumps is respectively 60%, 45% and 30% of largest loop discharge, a circulating pump, No. two circulating pumps and No. three circulating pumps use #1, #2 and #3 to represent respectively, carrying out practically mode is as shown in table 2
Table 2 pump operating cycle mode (follows pump numbering: #1:60%; #2:45%; #3:30%)
Achieve the staged of circulating water flow from 30% to 135% by the adjustment of circulating pump to regulate.
2. cooling water circulation pumping system according to claim 1, is characterized in that: entrance or the outlet of every platform circulating pump are provided with check-valves.
3. cooling water circulation pumping system according to claim 1, is characterized in that: be positioned at every entrance of platform circulating pump and/or the valve of outlet, the standard-sized sheet when corresponding circulating pump starts, the full cut-off when corresponding circulating pump stops.
4. cooling water circulation pumping system according to claim 1, is characterized in that: described valve is electric hydaulic butterfly valve structure.
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| CN105215312B (en) * | 2015-09-30 | 2018-04-27 | 宝山钢铁股份有限公司 | A kind of double-roll thin-belt continuous casting roller cooling water flow 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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