CN107642123B - A kind of more series connection of pumps circulations of industry and its matching process - Google Patents
A kind of more series connection of pumps circulations of industry and its matching process Download PDFInfo
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- CN107642123B CN107642123B CN201710796217.1A CN201710796217A CN107642123B CN 107642123 B CN107642123 B CN 107642123B CN 201710796217 A CN201710796217 A CN 201710796217A CN 107642123 B CN107642123 B CN 107642123B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
Abstract
The invention discloses a kind of more series connection of pumps circulations of industry, including positive pressure sensor P1, B/P EGR Back Pressure Transducer EGR P2, primary pump, two stage pump, cooling tower, rectifying column and controller.The present invention can be greater than 35 meters according to the pipe network structure characteristic of industrial circulating water system, i.e. rectifying column return pipe height.The invention also discloses the matching process of the more series connection of pumps circulations of such industry.Practical lift demand is calculated, determines the configuration of primary pump, two stage pump by calculation formula using more series connection of pumps structures.According to system-head curve before establishing negative pressure, after establishing negative pressure, operational process is rationally controlled.Industrial circulating water system is fully solved because of system performance, is needed in operational process through " suppressing valve ", to prevent pump group overcurrent from running, and leads to that system energy consumption is high, energy loss is big, the low problem of operational efficiency.
Description
Technical field
The present invention relates to industrial circulating water systems, are specifically related to one kind and are applied to rectifying column water outlet height greater than 35 meters
In the case of the more series connection of pumps circulations of industry and its matching process.
Technical background
For industrial circulating water system using water pump as power source, water is cold and hot amount exchange and conveying of the medium for technical process,
It is essential basic link in fields such as petrochemical industry, Ferrous Metallurgy, mechano-electronic, food pharmaceutical, thermoelectricity.
In systems in practice, water pump configuration lift is for overcoming pipe network highest point resistance, when water flow passes through system highest point
Negative pressure is formed later, resistance of pipe system is caused to decline, and water pump configuration lift is apparently higher than actual motion lift, and water pump is caused to cross carrying
Row.In order to make water pump operation nonoverload scene all be by " suppressing valve " come such issues that solve, it has also become common fault in industry.
Power source of 1: two water pump of the prior art as conveying water, is needed by pipeline by the first valve or the first
Water is pipelined to rectifying column by two；Water is delivered back into cooling tower by the second valve by pipeline；Complete a week
Phase circulation.In design, pump head is matched with rectifying column and resistance of pipe system, lift and flow have it is more than needed, work
State is also to be adjusted by rectifying column operating condition.Such circulation is only adjusted according to the actual conditions of operation,
System just can be at running well.
If just will appear water pump over-current phenomenon avoidance, therefore operating normally by valve wide open in the system of normal operation
When, three valve states need to be adjusted to meet and operate normally.It is exemplified below: when circulation is run for the first time, two water pumps
In one of operation, in order to which system water can reach pipeline and establish circulation, it is necessary to which the first valve or the second valve is complete
It opens, since rectifying column is very high, height > 35m when the water flow in pipeline flows downward, can be formed after establishing circulation in pipeline
One negative-pressure sucking.Its value, increases with water flow height of drop and is increased, and maximum value is close to a technical atmosphere.It is at this time
Be equivalent to mostly nearly 10 meters of the pipeline pump of a lift in system, water pump operation then can overcurrent, in order to meet operation demand, Ren Menyou
Using " suppressing valve " means, the aperture of three valves is adjusted, to prevent water from pumping overcurrent.
Flow problem is crossed in order to solve water pump, after negative pressure is established in pipeline, when water pump overcurrent, adjusts the first valve or the
The aperture of two valves is adjusted down by original aperture 100%, until water pump electric current is within the scope of rated current, but due to " suppressing
Valve " flow is lower, and third valve opening is 100% in pipeline, and pipeline is unobstructed, and flow velocity is too fast, and flow rapidly returns back in cooling tower,
Cause rectifying column flow too small, rectifying column heat exchange is extremely impacted, and for the flow demand of rectifying column in guarantee system, then people are just
Third valve is adjusted, third valve opening is adjusted down by original 100%, adjusts to abundant water in rectifying column, meets life
Production demand, it is clear that such method of operation method be it is rough, do not solve the problems, such as from the root, pump efficiency is lower, pump head
Internal pressure becomes larger, and fault of water pump rate is got higher, and pipe network energy loss becomes larger, and system overall operation efficiency is lower.
Summary of the invention
Goal of the invention: the purpose of the present invention is in view of the above-mentioned problems, propose that one kind can be realized in industrial circulating water field,
Practical lift demand is calculated, determines the configuration of primary pump, two stage pump by calculation formula using more series connection of pumps structures.According to
System-head curve rationally controls before establishing negative pressure, after establishing negative pressure, to operational process.Realize a kind of more series connection of pumps recirculated waters of industry
System design and matching process.Industrial circulating water system is fully solved because of system performance, needs to come by " suppressing valve " in operational process
It prevents pump group overcurrent from running, and leads to that system energy consumption is high, energy loss is big, the low problem of operational efficiency.
Technical solution: the invention adopts the following technical scheme:
A kind of more series connection of pumps circulations of industry, including at least one primary pump as conveying hydrodynamic force source and at least
One two stage pump, primary pump water outlet are connected with two stage pump water inlet again by pipeline, and two stage pump water outlet is connected by pipeline
To rectifying column water inlet, rectifying column water outlet is connected to cooling tower water inlet by pipeline, and cooling tower bottom extends a root canal
Road is connected to primary pump water inlet, constitutes a circulation；The valve being arranged in parallel including one with two stage pump and the first positive pressure
Sensor P1, the second B/P EGR Back Pressure Transducer EGR P2 and controller, the first positive pressure sensor P1 are mounted on two stage pump and rectifying column
On connected pipeline, the second B/P EGR Back Pressure Transducer EGR P2 is mounted on the pipeline that rectifying column is connected with cooling tower, and described
One positive pressure sensor P1, the second B/P EGR Back Pressure Transducer EGR P2 are connected with the signal input part of controller, the signal output end of controller with
Primary pump, two stage pump, valve are connected.
Further, the height of the rectifying column water outlet is not less than 35 meters, i.e. rectifying tower height degree is not less than 35 meters.
This point is precondition of the invention, only when rectifying column water outlet height is not less than 35 meters, is recycled establishing
Afterwards, when the water flow in pipeline flows downward, a negative-pressure sucking can be formed in pipeline.
Further, the primary pump being connected in parallel including three and two two stage pumps being connect with valve in parallel, three
The water outlet of primary pump passes through the common water inlet that pipeline is connected to two stage pump after parallel connection.
A kind of matching process of the more series connection of pumps circulations of industry, comprising the following steps:
1) type selection of primary pump determines the numerical value of parameters, according to H1, H2, H3, H4, H5 in the circulatory system
Demand lift and resistance of pipe system, the lift demand of the configuration of primary pump needed for calculating；Wherein, H1 is cooling tower apart from ground level；
H2 distance between level-one pump inlet and second level pump discharge；H3 is that primary pump is exported to device of spiral-screen column distance；H4 is rectifying column
Device cooling water pipe height；Negative pressure lift of the H5 in the pipeline between rectifying column and cooling tower；
2) type selection of two stage pump, according to lift and resistance of pipe system caused by H5 pipeline negative pressure in the circulatory system, meter
The lift demand of the configuration of two stage pump needed for calculating；
3) parameter initialization: setting demand primary pump, two stage pump need to open the reference pressure value of operation, setting two simultaneously
Grade pump, needs reference pressure value out of service；
4) after circulation starting, controller output starting primary pump and two stage pump, while being sensed by the first positive pressure
Device P1 detects the real-time pressure value of rectifying column water inlet, if the real-time pressure value detected is lower than established standards pressure value,
Keep two operating statuses simultaneously；
The real-time negative pressure value of rectifying column outlet is detected by the second B/P EGR Back Pressure Transducer EGR, if detecting that real-time negative pressure value is close
In a standard engineering atmospheric pressure, then valve is opened, after valve opening, detects that real-time negative pressure value remains close to a standard
Technical atmosphere, then two stage pump, out of service；
(6) when detecting that rectifying column water inlet real-time pressure value and the real-time negative pressure value of rectifying column reach respective normal pressure
When, remain primary pump, stable operation.
Further, in the step 1) when selecting level-one pump lift, it is necessary to understand that total (pumping) head H's and net lift Hx is general
Considering their relationship, net lift Hx refers to water entering surface to the vertical range between export center；Water pump rated head should be calculating
1~1.1 times of total (pumping) head；Primary pump total (pumping) head formula are as follows:
H6=Hx+h+V2/2g
In formula: H6 is primary pump total (pumping) head；Hx is water pump net lift；H is line loss lift；V2/ 2g is at pump discharge
Kinetic energy rejection head；
According to this formula, in the apolegamy of level-one pump lift, it is necessary to by following formula to Hx, h, V2/ 2g carries out subitem meter
It calculates, wherein Hx calculation formula are as follows:
Hx=H4-H1
In formula: H1 is cooling tower apart from ground level；H4: device of spiral-screen column cooling water pipe height；
H calculation formula are as follows:
100 × r of h=(Hx+H2+H3) ÷
In formula: Hx is that water pump net lift is equal to vertical duct length；H2 is between level-one pump inlet and second level pump discharge
Distance；H3 is that primary pump is exported to device of spiral-screen column distance；R is that rice number is lost in every 100 meters of pipeline；
Kinetic energy rejection head V2/ 2g is the function of flow, calculation formula for different tube diameters are as follows:
V2/ 2g=K × Q2
In formula: K is the kinetic energy resistance coefficient of different tube diameters；Q is piping flow.
Further, in the step 2), second level pump lift matches calculation formula:
H7=Hx+h+V2/ 2g=H5+h+V2/2g
In formula: Hx is water pump net lift；H is line loss lift；V2/ 2g is the kinetic energy rejection head at pump discharge；H with
V2/ 2g ignores close to 0；Negative pressure lift of the H5 in the pipeline between rectifying column and cooling tower, when the water flow in pipeline
When flowing downward, a negative-pressure sucking can be formed in pipeline, value increases with the increase of water flow height of drop, works as recirculated water
When stream fills up the pipeline, negative-pressure sucking can also be set up, less than one technical atmosphere of value, i.e. H5 < 10 meter；Then second level
Pump lift calculation formula are as follows: H7=H5.
Further, the rectifying column import reference pressure value is determined according to production technology and demand, when rectifying column is discharged
When open height is greater than 35m, rectifying column export standard negative pressure value is -50Kpa to -100Kpa.
Further, when circulation is run for the first time, according to production technology and demand established standards pressure value, work as essence
It evaporates tower inlet pressure and is unsatisfactory for established standards pressure value, and when rectifying column water outlet standard negative pressure value is not set up, controller is simultaneously
Output control primary pump, two stage pump open operation, meet operation demand for the first time, when running for the first time, valve is in close state.
Further, when circulation operates normally, according to production technology and demand established standards pressure value, work as essence
Evaporate tower inlet pressure and meet established standards pressure value P 1, and rectifying column export standard negative pressure value P2 establish -50Kpa to -
Between 100Kpa, after valve is opened in controller output, and two stage pump is controlled, it is out of service；Primary pump remains operational, and meets just
Normal operation demand.Demand negative pressure value is set by demand user, and setting range is between -50Kpa to -100Kpa.
The utility model has the advantages that the present invention is compared with prior art:
In applicable industry circulation, it can be realized in industrial circulating water field, using more series connection of pumps structures, by meter
Formula is calculated, practical lift and flow demand is calculated, determines the configuration of primary pump, two stage pump.It is negative in foundation according to system-head curve
Before pressure, after establishing negative pressure, operational process is rationally controlled.Realize a kind of more series connection of pumps circulations designs of industry and match party
Method.Industrial circulating water system is fully solved because of system performance, is needed in operational process through " suppressing valve ", to prevent pump group overcurrent from transporting
Row, and lead to that system energy consumption is high, energy loss is big, the low problem of operational efficiency.The present invention can be according to calculation method reasonable disposition
Pump group reduces cost of investment.Reasonable operational process of the invention can reduce pump group energy consumption.Pipe network water can be effectively reduced in pump invention
Resistance reduces circulatory system energy consumption.System overall operation efficiency can be improved simultaneously.
Detailed description of the invention
Fig. 1 is pipeline structure schematic diagram of the present invention using single primary pump and single two stage pump；
Fig. 2 is pipeline structure schematic diagram of the present invention using multiple primary pumps and multiple two stage pumps；
Fig. 3 is control route distribution map of the invention；
Fig. 4 is overall structure diagram of the invention.
Specific embodiment
The present invention is specifically addressed combined with specific embodiments below.
Embodiment 1
As shown in figures 1 and 3, the more series connection of pumps circulations of a kind of industry, including as conveying hydrodynamic force source at least
One primary pump 1 and at least one two stage pump 2,1 water outlet of primary pump are connected with 2 water inlet of two stage pump again by pipeline, second level
It pumps 2 water outlets and 3 water inlet of rectifying column is connected to by pipeline, 3 water outlet of rectifying column is connected to cooling tower 4 by pipeline and intakes
Mouthful, 4 bottom of cooling tower extends a root canal road and is connected to 1 water inlet of primary pump, constitutes a circulation；Including one and two stage pump
2 valves 5 being arranged in parallel and the first positive pressure sensor P1, the second B/P EGR Back Pressure Transducer EGR P2 and controller 6, described first just
Pressure sensor P1 is mounted on the pipeline that on the pipeline that two stage pump is connected with rectifying column 3 and rectifying column 3 is connected with cooling tower 4 simultaneously
On, the second B/P EGR Back Pressure Transducer EGR P2 is mounted on the pipeline that rectifying column 3 is connected with cooling tower 4, and first positive pressure passes
Sensor P1, the second B/P EGR Back Pressure Transducer EGR P2 are connected with the signal input part of controller 6, the signal output end and primary pump of controller 6
1, two stage pump 2, valve 5 are connected.
The height of 3 water outlet of rectifying column is not less than 35 meters, i.e. 3 height of rectifying column is not less than 35 meters.
This point is precondition of the invention, only when rectifying column water outlet height is not less than 35 meters, is recycled establishing
Afterwards, when the water flow in pipeline flows downward, a negative-pressure sucking can be formed in pipeline.
Embodiment 2
As shown in Figure 2, Figure 3 and Figure 4, the more series connection of pumps circulations of a kind of industry, including as conveying hydrodynamic force source
Three primary pumps 1 being connected in parallel and two two stage pumps 2 connecting with valve in parallel, the water outlet of three primary pumps 1 are logical
Piping is connected to the common water inlet of two stage pump 2 after parallel connection, and common water outlet is connected to essence by pipeline after 2 parallel connection of two stage pump
3 water inlet of tower is evaporated, 3 water outlet of rectifying column is connected to 4 water inlet of cooling tower by pipeline, and a root canal is extended in 4 bottom of cooling tower
Road is connected to the common water inlet after 1 parallel connection of primary pump, constitutes a circulation；There are one be arranged in parallel with two two stage pumps 2
Valve 5 and the first positive pressure sensor P1, the second B/P EGR Back Pressure Transducer EGR P2 and controller 6, the first positive pressure sensor P1
It is mounted between the pipeline that pipeline, the rectifying column 3 that two stage pump 2 is connected with rectifying column 3 are connected with cooling tower 4, described second is negative
Pressure sensor P2 is mounted on the pipeline that rectifying column 3 is connected with cooling tower 4, the first positive pressure sensor P1, the second negative pressure
Sensor P2 is connected with the signal input part of controller 6, the signal output end and primary pump 1, two stage pump 2, valve 5 of controller 6
It is connected.
The height of 3 water outlet of rectifying column is not less than 35 meters, i.e. 3 height of rectifying column is not less than 35 meters.This point is this hair
Bright precondition, only when rectifying column water outlet height is not less than 35 meters, after establishing circulation, the water flow in pipeline is downward
When flowing, a negative-pressure sucking can be formed in pipeline.
Embodiment 3
A kind of matching process of the more series connection of pumps circulations of industry, comprising the following steps:
1) type selection of primary pump determines the numerical value of parameters, according to H1, H2, H3, H4, H5 in the circulatory system
Demand lift and resistance of pipe system, the lift demand of the configuration of primary pump needed for calculating；Wherein, H1 is cooling tower apart from ground level；
H2 distance between level-one pump inlet and second level pump discharge；H3 is that primary pump is exported to device of spiral-screen column distance；H4 is rectifying column
Device cooling water pipe height；Negative pressure lift of the H5 in the pipeline between rectifying column and cooling tower；
2) type selection of two stage pump, according to lift and resistance of pipe system caused by H5 pipeline negative pressure in the circulatory system, meter
The lift demand of the configuration of two stage pump needed for calculating；
3) parameter initialization: setting demand primary pump, two stage pump need to open the reference pressure value of operation, setting two simultaneously
Grade pump, needs reference pressure value out of service；
4) after circulation starting, controller output starting primary pump and two stage pump, while being sensed by the first positive pressure
Device P1 detects the real-time pressure value of rectifying column water inlet, if the real-time pressure value detected is lower than established standards pressure value,
Keep two operating statuses simultaneously；
The real-time negative pressure value of rectifying column outlet is detected by the second B/P EGR Back Pressure Transducer EGR, if detecting that real-time negative pressure value is close
In a standard engineering atmospheric pressure, then valve 5 is opened, after the opening of valve 5, detects that real-time negative pressure value remains close to a mark
Quasi- technical atmosphere, then two stage pump, out of service；
(7) when detecting that rectifying column water inlet real-time pressure value and the real-time negative pressure value of rectifying column reach respective normal pressure
When, remain primary pump, stable operation.
In the step 1) when selecting level-one pump lift, it is necessary to understand total (pumping) head H and net lift Hx concept and they
Relationship, net lift Hx refers to water entering surface to the vertical range between export center；Water pump rated head, which should be, calculates the 1 of total (pumping) head
~1.1 times；Primary pump total (pumping) head formula are as follows:
H6=Hx+h+V2/2g
In formula: H6 is primary pump total (pumping) head；Hx is water pump net lift；H is line loss lift；V2/ 2g is at pump discharge
Kinetic energy rejection head；
According to this formula, in the apolegamy of level-one pump lift, it is necessary to by following formula to Hx, h, V2/ 2g carries out subitem meter
It calculates, wherein Hx calculation formula are as follows:
Hx=H4-H1
In formula: H1 is cooling tower apart from ground level；H4: device of spiral-screen column cooling water pipe height；
H calculation formula are as follows:
100 × r of h=(Hx+H2+H3) ÷
In formula: Hx is that water pump net lift is equal to vertical duct length；H2 is between level-one pump inlet and second level pump discharge
Distance；H3 is that primary pump is exported to device of spiral-screen column distance；R is that rice number is lost in every 100 meters of pipeline；
Kinetic energy rejection head V2/ 2g is the function of flow, calculation formula for different tube diameters are as follows:
V2/ 2g=K × Q2
In formula: K is the kinetic energy resistance coefficient of different tube diameters；Q is piping flow.
In the step 2), second level pump lift matches calculation formula:
H7=Hx+h+V2/ 2g=H5+h+V2/2g
In formula: Hx is water pump net lift；H is line loss lift；V2/ 2g is the kinetic energy rejection head at pump discharge；H with
V2/ 2g ignores close to 0；Negative pressure lift of the H5 in the pipeline between rectifying column and cooling tower, when the water flow in pipeline
When flowing downward, a negative-pressure sucking can be formed in pipeline, value increases with the increase of water flow height of drop, works as recirculated water
When stream fills up the pipeline, negative-pressure sucking can also be set up, less than one technical atmosphere of value, i.e. H5 < 10 meter；Then second level
Pump lift calculation formula are as follows: H7=H5.
The rectifying column import reference pressure value is determined according to production technology and demand, when rectifying column water outlet height is big
When 35m, rectifying column export standard negative pressure value is -50Kpa to -100Kpa.
When circulation is run for the first time, according to production technology and demand established standards pressure value, when rectifying column import
Pressure is unsatisfactory for established standards pressure value, and when rectifying column water outlet standard negative pressure value is not set up, controller exports control simultaneously
Primary pump, two stage pump open operation, meet operation demand for the first time, when running for the first time, valve is in close state.
When circulation operates normally, according to production technology and demand established standards pressure value, when rectifying column import
Pressure meets established standards pressure value P 1, and rectifying column export standard negative pressure value P2 is established between -50Kpa to -100Kpa, control
After valve is opened in device output processed, and two stage pump is controlled, it is out of service；Primary pump remains operational, and meets normal operation demand.It needs
Negative pressure value is asked to be set by demand user, setting range is between -50Kpa to -100Kpa.
Claims (8)
1. a kind of more series connection of pumps circulations of industry, including at least one primary pump and at least one as conveying hydrodynamic force source
A two stage pump, primary pump water outlet are connected with two stage pump water inlet again by pipeline, and two stage pump water outlet is connected to by pipeline
Rectifying column water inlet, rectifying column water outlet are connected to cooling tower water inlet by pipeline, and cooling tower bottom extends a root canal road
It is connected to primary pump water inlet, constitutes a circulation；It is characterized in that be, the valve being arranged in parallel including one with two stage pump,
And the first positive pressure sensor P1, the second B/P EGR Back Pressure Transducer EGR P2 and controller, the first positive pressure sensor P1 are mounted on two
On the pipeline that grade pump is connected with rectifying column, the second B/P EGR Back Pressure Transducer EGR P2 is mounted on the pipeline that rectifying column is connected with cooling tower
On, the first positive pressure sensor P1, the second B/P EGR Back Pressure Transducer EGR P2 are connected with the signal input part of controller, the letter of controller
Number output end is connected with primary pump, two stage pump, valve；The height of the rectifying column water outlet is not less than 35 meters, i.e. rectifying tower height
Degree is not less than 35 meters.
2. the more series connection of pumps circulations of industry according to claim 1, it is characterised in that: be connected in parallel including three
Primary pump and two two stage pumps connecting with valve in parallel, the water outlet of three primary pumps pass through pipeline and are connected to parallel connection
The common water inlet of two stage pump afterwards.
3. a kind of matching process of the more series connection of pumps circulations of industry as described in claim 1, it is characterised in that: including with
Lower step:
1) type selection of primary pump determines the numerical value of parameters, according to the demand of H1, H2, H3, H4, H5 in the circulatory system
Lift and resistance of pipe system, the lift demand of the configuration of primary pump needed for calculating；Wherein, H1 is cooling tower apart from ground level；H2 is
Distance between level-one pump inlet and second level pump discharge；H3 is that primary pump is exported to device of spiral-screen column distance；H4 is device of spiral-screen column
Cooling water pipe height；Negative pressure lift of the H5 in the pipeline between rectifying column and cooling tower；
2) type selection of two stage pump calculates institute according to lift and resistance of pipe system caused by H5 pipeline negative pressure in the circulatory system
The lift demand for needing two stage pump to configure；
3) parameter initialization: setting demand primary pump, two stage pump need to open the reference pressure value of operation simultaneously, set two stage pump,
Need reference pressure value out of service；
4) after circulation starting, controller output starting primary pump and two stage pump, while passing through the first positive pressure sensor P1
The real-time pressure value of rectifying column water inlet is detected, if the real-time pressure value detected is lower than established standards pressure value, is kept
Two while operating status；
The real-time negative pressure value that rectifying column outlet is detected by the second B/P EGR Back Pressure Transducer EGR, if detecting real-time negative pressure value close to one
A standard engineering atmospheric pressure, then open valve, after valve opening, detects that real-time negative pressure value remains close to a standard engineering
Atmospheric pressure, then two stage pump, out of service；
(5) when detecting that rectifying column water inlet real-time pressure value and the real-time negative pressure value of rectifying column reach respective normal pressure,
Remain primary pump, stable operation.
4. the matching process of the more series connection of pumps circulations of industry according to claim 3, it is characterised in that: the step
1) in when selecting level-one pump lift, it is necessary to understand the concept of total (pumping) head H and net lift Hx and their relationship, net lift Hx is
The fingering water surface is to the vertical range between export center；Water pump rated head should be 1~1.1 times of calculating total (pumping) head；Primary pump is total
Lift formula are as follows:
H6=Hx+h+V2/2g
In formula: H6 is primary pump total (pumping) head；Hx is water pump net lift；H is line loss lift；V2/ 2g is the kinetic energy at pump discharge
Loss head；
According to this formula, in the apolegamy of level-one pump lift, it is necessary to by following formula to Hx, h, V2/ 2g carries out subitem calculating,
Middle Hx calculation formula are as follows:
Hx=H4-H1
In formula: H1 is cooling tower apart from ground level；H4: device of spiral-screen column cooling water pipe height；
H calculation formula are as follows:
100 × r of h=(Hx+H2+H3) ÷
In formula: Hx is that water pump net lift is equal to vertical duct length；H2 distance between level-one pump inlet and second level pump discharge；
H3 is that primary pump is exported to device of spiral-screen column distance；R is that rice number is lost in every 100 meters of pipeline；
Kinetic energy rejection head V2/ 2g is the function of flow, calculation formula for different tube diameters are as follows:
V2/ 2g=K × Q2
In formula: K is the kinetic energy resistance coefficient of different tube diameters；Q is piping flow.
5. the matching process of the more series connection of pumps circulations of industry according to claim 3, it is characterised in that: the step
2) in, second level pump lift matches calculation formula:
H7=Hx+h+V2/ 2g=H5+h+V2/2g
In formula: Hx is water pump net lift；H is line loss lift；V2/ 2g is the kinetic energy rejection head at pump discharge；H and V2/2g
Close to 0, ignore；Negative pressure lift of the H5 in the pipeline between rectifying column and cooling tower, when the water flow in pipeline is downward
When flowing, a negative-pressure sucking can be formed in pipeline, value increases with the increase of water flow height of drop, when circulating water flow will
When the pipeline fills up, negative-pressure sucking can also be set up, less than one technical atmosphere of value, i.e. H5 < 10 meter；Then two stage pump is raised
Journey calculation formula are as follows: H7=H5.
6. the matching process of the more series connection of pumps circulations of industry according to claim 3, it is characterized in that: the rectifying column
Import reference pressure value is determined according to production technology and demand, when rectifying column water outlet height is greater than 35m, rectifying column outlet
Standard negative pressure value is -50Kpa to -100Kpa.
7. the matching process of the more series connection of pumps circulations of industry according to claim 3, it is characterised in that: work as recirculated water
When system is run for the first time, according to production technology and demand established standards pressure value, when rectifying column inlet pressure is unsatisfactory for setting mark
Quasi- pressure value, and when rectifying column water outlet standard negative pressure value is not set up, controller exports control primary pump simultaneously, two stage pump is opened
Operation meets operation demand for the first time, and when running for the first time, valve is in close state.
8. the matching process of the more series connection of pumps circulations of industry according to claim 3, it is characterised in that: work as recirculated water
When system operates normally, according to production technology and demand established standards pressure value, when rectifying column inlet pressure meets established standards
Pressure value P 1, and rectifying column export standard negative pressure value P2 is established between -50Kpa to -100Kpa, valve is opened in controller output
Afterwards, and two stage pump is controlled, it is out of service；Primary pump remains operational, and meets normal operation demand；Demand negative pressure value is used by demand
Family setting, setting range is between -50Kpa to -100Kpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710796217.1A CN107642123B (en) | 2017-09-06 | 2017-09-06 | A kind of more series connection of pumps circulations of industry and its matching process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710796217.1A CN107642123B (en) | 2017-09-06 | 2017-09-06 | A kind of more series connection of pumps circulations of industry and its matching process |
Publications (2)
| Publication Number | Publication Date |
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| CN107642123A CN107642123A (en) | 2018-01-30 |
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| DE2609113A1 (en) * | 1976-03-05 | 1977-09-15 | Linde Ag | Air conditioning system for coastal cities - has cooling towers linked through pumps to cooling plants coupled to sea |
| CN102654097A (en) * | 2011-03-02 | 2012-09-05 | 上海福思特流体机械有限公司 | Intelligent industrial circulating water excess pressure recycling device and use method thereof |
| CN104774680A (en) * | 2015-04-20 | 2015-07-15 | 商丘金蓬实业股份有限公司 | Industrial continuous waste oil treatment distillation equipment |
| CN204961407U (en) * | 2015-07-20 | 2016-01-13 | 山东同成医药科技有限公司 | Vacuum pump circulating water cooling cyclic utilization device |
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| US20130174913A1 (en) * | 2012-01-10 | 2013-07-11 | Munters Corporation | Method and apparatus for controlling total dissolved solids in a liquid circulation system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2609113A1 (en) * | 1976-03-05 | 1977-09-15 | Linde Ag | Air conditioning system for coastal cities - has cooling towers linked through pumps to cooling plants coupled to sea |
| CN102654097A (en) * | 2011-03-02 | 2012-09-05 | 上海福思特流体机械有限公司 | Intelligent industrial circulating water excess pressure recycling device and use method thereof |
| CN104774680A (en) * | 2015-04-20 | 2015-07-15 | 商丘金蓬实业股份有限公司 | Industrial continuous waste oil treatment distillation equipment |
| CN204961407U (en) * | 2015-07-20 | 2016-01-13 | 山东同成医药科技有限公司 | Vacuum pump circulating water cooling cyclic utilization device |
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Address after: Room 1101, main building, 298 Xingye Road, Xinjie street, Yixing City, Wuxi City, Jiangsu Province, 214200 Patentee after: JIANGSU TEKENENNA ENERGY SAVING TECHNOLOGY Co.,Ltd. Address before: Room 1101, main building, 298 Xingye Road, Xinjie street, Yixing City, Wuxi City, Jiangsu Province, 214200 Patentee before: JIANGSU TEKENE ENERGY SAVING TECHNOLOGY CO.,LTD. |