CN104624676B - Energy-saving configuration method of hot-rolling descaling device - Google Patents
Energy-saving configuration method of hot-rolling descaling device Download PDFInfo
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Abstract
The invention provides an energy-saving configuration method of a hot-rolling descaling device. The method aims at energy-saving improvement of main process parameter determination in model selection of hot-rolling devices, particularly aims at energy-saving optimization of a parameter determination method of a hot-rolling descaling device, and is mainly used for solving the technical problem that under existing descaling configuration conditions, a descaling pump always works at highest power and accordingly energy consumption is large. According to the technical scheme, the energy-saving configuration method of the hot-rolling descaling device includes the step of determining descaling flow of descaling points, start time of the descaling points and production rhythm requirements. The largest flow of each piece of steel is calculated under the worst conditions, the largest amount of water consumed each hour is calculated, pumping capacity is considered according to the largest amount of water consumed each hour, and configuration with smallest energy consumption is selected. Accumulator configuration should guarantee that under combined supply conditions of the descaling pump and an accumulator, the requirement for periodical large water quantity is met. The method can achieve the energy-saving effect on the basis that the descaling effect is not reduced under various production conditions.
Description
Technical field
The present invention be directed to the Energy-saving reformation that in equipment of hot rolling type selecting, main technologic parameters determine, especially for hot rolling de-scaling
The energy saving optimizing of the method that device parameter determines.
Background technology
Hot rolling scale removal equipment mainly includes descaling pump, de-scaling motor, accumulator etc. at present.Wherein descaling pump and motor are phases
Coupling, de-scaling pump type determines, just has corresponding motor to match.And between the effect of accumulator is using live not de-scaling
Gap, high pressure descaling water is stored up, and when live de-scaling puts into, the water under high pressure of storage as the supplement of descaling pump, to keep
The stablizing of pressure.General hot rolling descaling pump requires pressure high, commonly reaches more than 20mpa, power of motor is generally more than 2000kw,
It is power frequency motor, starts rear motor full power operation, power consumption is very big.Conventional design descaling pump will meet scene maximum de-scaling will
Ask, accumulator is only used as balancing pressure, prevents " water hammer ", the means of protective conduit equipment.This de-scaling method for parameter configuration, only
When having de-scaling water consumption at the scene maximum, efficiency is higher.Other time all can cause the waste of the live energy.In a word, this choosing
Type method, not only increases equipment investment, and also resulting in operation energy consumption increases.
Content of the invention
It is an object of the invention to provide a kind of energy-conservation collocation method of hot rolling scale removal equipment, mainly solve existing de-scaling configuration
Under the conditions of, descaling pump leads to the larger technical problem of energy consumption by peak power work always.The present invention is ensureing various production bars
On the basis of scale removal effect does not reduce under part, reach energy-saving effect.Main configuration thinking is according to mean flow under most severe condition
Amount demand, configures descaling pump；According to de-scaling ability and mal-condition next stage property difference in flow, configure accumulator.
A kind of energy-conservation collocation method of hot rolling scale removal equipment, the configuration step including descaling pump and accumulator configuration step,
The configuration step of wherein descaling pump is as follows:
1st, calculate every piece of steel de-scaling water consumption q by maximum de-scaling consumption,
2nd, press the fastest (1 hour) rhythm of production (t second) unit of account time rolling block number: n=3600/t,
3rd, calculate maximum water consumption q*n(ton hour),
4th, determine descaling pump minimum total flow: (1+k) q*n(ton hour), k is to save consumption coefficient, typically takes 0.1-0.3, main
Consider that the abrasion such as live nozzle causes changes in flow rate, cause flow to increase including nozzle wear, including pump blade abrasion pump energy
Power declines,
5th, preliminary de-scaling pump discharge of choosing: routinely bi chosen by pump, e.g., 400,380,360,300,240,
6th, determine descaling pump number of units mi=(1+k) q*n/bi,
7th, compare mi-trunc (mi), take large values,
8th, compare trunc (mi+1) and mi ratio, get the small value,
9th, compare trunc (mi+1) with corresponding power of motor long-pending, get the small value,
10th, determine descaling pump number of units: trunc (mi+1)；Determine de-scaling pump discharge bi.
Trunc is bracket function, and long-pending actual due to power of motor corresponding with trunc (mi+1) is exactly that de-scaling pump power disappears
Consumption, takes minima to be exactly substantially that energy consumption is minimum.What descaling pump quantity and flow considered is mean consumption, and actual production stage disappears
Consumption may be much larger than mean consumption it is necessary to rely on accumulator to be supplemented, and accumulator requires can there is enough abilities, otherwise
It is unsatisfactory for the requirement of actual production, accumulator configuration step is as follows:
1st, determine the de-scaling points a that most severe condition is at most opened,
2nd, de-scaling point j(j=1-a) flow nj, the longest injecting time be ta,
3rd, calculate maximum rate of water make-up,
1) assume t1 > t2 > t3 > t4 > ... > ta, at this moment (1+k) * (n1+n2+ ...+nx) > trunc (mi+1) * bi,
2) look for x, (1+k) * (n1+n2+ ...+nx) < trunc (mi+1) * bi, and (1+k) * (n1+n2+ ...+nx+1)
> trunc (mi+1) * bi,
3) determine the longest moisturizing time: t (x+1),
4) calculate actual maximum rate of water make-up: (k+1) * (t (x+1) * (n1+n2+ ...+n (x+1))+...+na*ta)-t
(x+1) * trunc (mi+1) * bi,
5) determine maximum rate of water make-up:
Maximum rate of water make-up=(1+y) * actual maximum rate of water make-up, y is efflux coefficient, typically takes 0-0.3, mainly due to each storage
Because pipeline is little between gesture device, gas exchange deficiency of time, the energy storage capability causing declines,
4th, maximum pressure p1 is taken according to pump parameter, according to technological requirement, take minimum pressure p2, calculate and correspond to during pressure change
Gas volume v1, v2
p1*v1=p2*v2
V2-v1=maximum rate of water make-up,
5th, combine live real space position limitation, routinely specification chooses accumulator volume vb, e.g., 12.5,10,8, look into
Ask its corresponding least quantity vi and maximum moisturizing ability vp.Least quantity mainly prevents air in accumulator from going in pipeline, with
This body structure of tank is relevant；Maximum moisturizing ability, mainly for preventing air in water pot, very little, water is too many, and in water pot, water enters gas
Tank, also relevant with this body structure of tank,
6th, according to maximum moisturizing capacity calculation water pot quantity c, take smallest positive integral,
C*vp > maximum rate of water make-up,
7th, primarily determine that accumulator tank quantity d, d selects smallest positive integral,
d*vb>v2+c*vi
As field condition does not allow d value, need to again choose vb, determine by 5-7 step,
8th, water pot quantity c, gas tank quantity d-c and volume vb are determined.
The Advantageous Effects of the present invention: specify that the de-scaling flow of each de-scaling point, each de-scaling point starting time and production
Rhythm requires.According to the maximum stream flow calculating every block of steel under most severe condition, calculate maximum water consumption hourly, descaling pump energy
Power determination just accounts for according to hour maximum water consumption, chooses total minimum configuration of consuming energy.Due to the fluctuation of de-scaling water content consumption
Property very big, when maximum, several points start simultaneously, and water loss is very big, do not have when minimum de-scaling point start, not water loss.Save up strength
Device configuration will ensure to meet the requirement of interim big yield under the conditions of descaling pump and accumulator are commonly fed.Press rank with conventional
Section property maximum configuration descaling pump is compared, and decreases descaling pump configuration quantity, and the more conventional configuration of accumulator ability is somewhat bigger than normal.One
As situation roughing average discharge only have interim flow half, new collocation method energy-saving effect maximum can reach more than 50%.This
In bright practical application, roughing descaling pump is by 2 360(ton hour) it is optimized for 1 380(ton hour), after site of deployment, hot rolling
During production, de-scaling pressure is consistently higher than minimum pressure requirement.Product surface quality obtains being widely recognized as of user.
Specific embodiment
, 1780 Hot Rolling Mill have 7 de-scaling points, the fastest rolling rhythm 85 seconds, its each point de-scaling taking 1780 rolling lines as a example
Flow was as follows: with time and total flow
During the most de-scaling point in scene, every block of steel needs the water yield is 7.255m3, by 85 seconds rolling rhythms, de-scaling pump discharge will reach
To 307.26(m3/ h) it is considered to 1.2 times of coefficients of waste, de-scaling pump discharge should reach 368.7(m3/ h), routinely de-scaling pump discharge
400th, 380,360,300,240, it is respectively required for from 1,1,2,2,2.
It is preferably 380m most3/ h mono-
Accumulator determines:
Stage is hsb, r11, r23 to the maximum and starts (stage flow 893 ton hour) simultaneously
As j=1,1.2*240 < 380；
As j=2,1.2* (240+413) > 380
Take x=2, maximum duration 13 seconds
Actual maximum rate of water make-up: 1.2*(13* (413+240)+11.02*240) -13*380=8421(m3S/h)=2.34m3
Maximum rate of water make-up=2.34*1.1=2.574m3
By descaling pump parameter maximum pressure 24.5mpa, technological requirement minimum pressure 22mpa, solve equation
v2-v1=2.574
24.5*v1=22*v2
V2=25.2(m3)
Consider field condition, in conjunction with conventional specification series, be 8m from tank volume3, its maximum rate of water make-up is 2m3, minimum water
Measure as 5m3,
2.574m3Need two water pots, c=2
8*m>25.2+2.574+10
M > 4.72, m takes 5
Two water pot: 2*8m3
Three gas tank: 3*8m3.
Finish rolling de-scaling:
| Rolling pass | Rolling time (s) | De-scaling time (s) | Metered flow (m3/h) | Flow subtotal (m3) |
| fsb | 100 | 110 | 306 | 9.35 |
During the most de-scaling point in scene, every block of steel needs the water yield is 9.35m3, by 120 seconds rolling rhythms, de-scaling pump discharge will reach
To 259(m3/ h) it is considered to 1.3 times of coefficients of waste (finish rolling is long due to the de-scaling time, and nozzle wear is serious, therefore capping 1.3), remove
Squama pump discharge should reach 336.7(m3/ h).
Conventional de-scaling pump discharge 400,380,360,300,240
It is respectively required for from 1,1,2,2,2.
It is preferably 360m most3/ h mono-
Accumulator determines:
It is fsb to the maximum
Maximum duration 110 seconds
(306*110) * 1.2-110*360 < 0
Do not need moisturizing
For balancing pressure, prevent water hammer, from water pot a: 1*8m3.
Claims (1)
1. a kind of energy-conservation collocation method of hot rolling scale removal equipment, is characterized in that configuring including the configuration step of descaling pump and accumulator
The configuration step of step, wherein descaling pump is as follows:
1st, calculate every piece of steel de-scaling water consumption q by maximum de-scaling consumption,
2nd, press the fastest rhythm of production unit of account time rolling block number n=3600/t,
3rd, calculate maximum water consumption q*n ton hour,
4th, determine descaling pump minimum total flow: (1+k) q*n ton hour, k is to save consumption coefficient, takes 0.1-0.3,
5th, preliminary de-scaling pump discharge of choosing: routinely descaling pump chooses bi,
6th, determine descaling pump number of units mi=(1+k) q*n/bi,
7th, compare the value of mi-trunc (mi), take large values, trunc is bracket function,
8th, compare the value of trunc (mi+1) and mi, get the small value,
9th, compare trunc (mi+1) and corresponding power of motor long-pending value, get the small value,
10th, determine descaling pump number of units: trunc (mi+1)；Determine de-scaling pump discharge bi；
Accumulator configuration step is as follows:
1st, determine the de-scaling points a that most severe condition is at most opened,
2nd, the flow nj of de-scaling point j, the longest injecting time is ta, j=1-a,
3rd, calculate maximum rate of water make-up,
1) assume t1 > t2 > t3 > t4 > ... > ta, at this moment (1+k) * (n1+n2+ ...+nx) > de-scaling pump capacity nbi,
2) look for x, (1+k) * (n1+n2+ ...+nx)<nbi, and (1+k) * (n1+n2+ ...+nx+1)>nbi,
3) determine the longest moisturizing time: t (x+1),
4) calculate actual maximum rate of water make-up: (k+1) * (t (x+1) * (n1+n2+ ...+n (x+1))+...+na*ta)-t (x+
1) * nbi,
5) determine maximum rate of water make-up
Maximum rate of water make-up=(1+y) * actual maximum rate of water make-up
Y be efflux coefficient, typically take 0-0.3, mainly due between each accumulator because pipeline is little, gas exchange deficiency of time,
The energy storage capability causing declines；
4th, the maximum pressure p1 according to pump parameter and technological requirement minimum pressure p2, calculates corresponding gas volume during pressure change
v1、v2
p1*v1=p2*v2
V2-v1=maximum rate of water make-up,
5th, combine live real space position limitation, routinely specification chooses accumulator volume vb, inquire about its corresponding least quantity
Vi and maximum moisturizing ability vp,
6th, according to maximum moisturizing capacity calculation water pot quantity c, take smallest positive integral,
C*vp > maximum rate of water make-up,
7th, primarily determine that accumulator tank quantity d, d selects smallest positive integral,
d*vb>v2+c*vi
As field condition does not allow d value, need to again choose vb, determine by 5-7 step,
8th, water pot quantity c, gas tank quantity d-c and volume vb are determined.
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| WO2009003342A1 (en) * | 2007-07-04 | 2009-01-08 | Baoshan Iron & Steel Co., Ltd. | A high efficient, energy-saving process of continuous casting-rolling of the strip steels |
| CN101559439A (en) * | 2009-05-26 | 2009-10-21 | 广州金关节能科技发展有限公司 | Energy-saving control method for multi-section descaling and control device thereof |
| JP2012192432A (en) * | 2011-03-16 | 2012-10-11 | Toshiba Mitsubishi-Electric Industrial System Corp | Descaling system |
| CN102755997A (en) * | 2012-07-26 | 2012-10-31 | 宝钢不锈钢有限公司 | Safe and energy-saving control device and control method of hot rolling high-pressure descaling system |
| CN103302117A (en) * | 2013-06-21 | 2013-09-18 | 上海宝钢节能技术有限公司 | Single-pump descaling variable frequency control system and control method thereof |
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- 2013-11-15 CN CN201310568812.1A patent/CN104624676B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009003342A1 (en) * | 2007-07-04 | 2009-01-08 | Baoshan Iron & Steel Co., Ltd. | A high efficient, energy-saving process of continuous casting-rolling of the strip steels |
| CN101559439A (en) * | 2009-05-26 | 2009-10-21 | 广州金关节能科技发展有限公司 | Energy-saving control method for multi-section descaling and control device thereof |
| JP2012192432A (en) * | 2011-03-16 | 2012-10-11 | Toshiba Mitsubishi-Electric Industrial System Corp | Descaling system |
| CN102755997A (en) * | 2012-07-26 | 2012-10-31 | 宝钢不锈钢有限公司 | Safe and energy-saving control device and control method of hot rolling high-pressure descaling system |
| CN103302117A (en) * | 2013-06-21 | 2013-09-18 | 上海宝钢节能技术有限公司 | Single-pump descaling variable frequency control system and control method thereof |
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