CN104971947B - Method for controlling liquid level of laminar flow water tank - Google Patents
Method for controlling liquid level of laminar flow water tank Download PDFInfo
- Publication number
- CN104971947B CN104971947B CN201410145529.2A CN201410145529A CN104971947B CN 104971947 B CN104971947 B CN 104971947B CN 201410145529 A CN201410145529 A CN 201410145529A CN 104971947 B CN104971947 B CN 104971947B
- Authority
- CN
- China
- Prior art keywords
- water
- pump
- water tank
- lmin
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
Abstract
The invention provides a method for controlling the liquid level of a laminar flow water tank. Variable-frequency pumps are adopted and connected with a PLC through a frequency converter. The PLC works out the water consumption Q of a next piece of steel and the interval time T between a current piece of steel and the next piece of steel and works out the frequency conversion control given value of each pump according to the water consumption and the interval time so that water stored in the water tank can meet the supply requirement without overflowing before the next piece of steel comes. With the current water amount of the water tank being Q0, the minimum flow of each pump being Lmin, the maximum flow of each pump being Lmax and the water supplement delay time being t, the amount Q1 of water needing to be additionally supplemented meets the formula that Q1=Q-Q0-Lminx(T-t), and the number N of needed rotating pumps meets the formula that N=Q1/[(Lmax-Lmin)x(T-t)], wherein the integer part of N indicates the number of full-load rotating pumps, and the decimal part of N indicates the frequency conversion given value of one pump; the other water pumps operate at the minimum flow. The method can effectively solve the overflowing problem of the elevated laminar flow water tank, greatly save water resources and reduce energy waste.
Description
Technical field
The invention belongs to Steel Rolling Control field, more particularly, to a kind of for section cooling water tank liquid level after Rolling for Hot Rolled Strip
Control method.
Background technology
The strip steel that hot-rolled strip production line finishing mill shuts out coils into coil of strip by coiling machine after section cooling, in order to transport
Defeated and deposit.Cooling water for oiler temperature control is provided by an elevated tank, and the water of elevated tank is by laminar flow pumping plant
The supply of 4 630kw pumps.Original design only considers to meet the maximum water consumption of the fastest rolling rhythm of rolling line, causes 4 pump operatings
Shi Jingchang makes water tank be in overflow situation, causes the waste significantly of the energy.
Content of the invention
The present invention provides a kind of method controlling laminar flow of water case liquid level, its object is to solve what elevated tank overflow caused
Energy waste problem.
For this reason, the solution that the present invention is taken is:
A kind of method controlling laminar flow of water case liquid level, using variable frequency pump, variable frequency pump is connected with plc by converter,
Its control method is:
1st, plc calculates next block steel water consumption q and next block steel t interval time respectively.
2nd, plc gives according to the VFC that next block steel water consumption, next block steel Time Calculation go out each pump, reaches
Water tank water-retention before next block steel arrives furnishes good supplies to, and not overflow；
Current water volume in water tank q0, every pump minimum discharge lmin, every pump maximum stream flow lmax, t lag time of moisturizing,
Then:
Need water yields q supplemented more1=q-q0-lmin×(t-t)
Need to turn number of units n=q of pump1/〔(lmax-lmin)×(t-t)〕
The integer part of n is to turn pump number of units at full capacity；The fractional part of n is that the frequency conversion of a wherein pump gives；Remaining water
Pump is pressed minimum discharge and is run.
The invention has the benefit that
The present invention can effectively solving high position laminar flow water tank flooding problems, be greatly saved water resource, reduce the waste of the energy.
Brief description
Fig. 1 is to control laminar flow of water case liquid level method flow diagram.
Specific embodiment
, the method that the present invention controls laminar flow of water case liquid level, is that 4 water pumps are all changed to frequency conversion first taking 4 water pumps as a example
Water pump, sets up converter, and variable frequency pump is connected with plc by converter, and increases high water tank control program in plc.Tool
Body controlling means and process are:
Every pump maximum stream flow lmax is 50m3/ min, every pump minimum discharge lmin is 10m3/ min, the actual steel rolling time
For 1.5min, two pieces of steel rolling interval times are 1.5min, and moisturizing t lag time is 0.5min, and next block steel water consumption q is
300m3.
By current water volume in water tank q0=0 calculating, next block steel t=1.5+1.5=3min interval time
Need water yields q supplemented more1=q-q0- lmin × (t-t)=300-0-10 × (3-0.5)=275m3
Need to turn number of units n=q of pump1/〔(lmax-lmin)×(t-t)〕=275/〔(50-10)×(3-0.5)〕=2.75
Result of calculation n integer part is 2, i.e. 2 oeprations at full load；Fractional part is 0.75, i.e. wherein one 75% load
Run；Press minimum discharge for other one to run.
If next block water consumption is 400m3, other constant, then calculate n=3.75
I.e. wherein 3 oeprations at full load, another 75% load operation.
Claims (1)
1. a kind of control laminar flow of water case liquid level method it is characterised in that adopting variable frequency pump, variable frequency pump pass through converter with
Plc connects, and its control method is:
(1), plc calculates next block steel water consumption q and next block steel t interval time respectively；
(2), plc gives according to the VFC that next block steel water consumption, next block steel calculate each pump interval time, reaches
Water tank water-retention before arriving to next block steel furnishes good supplies to, and not overflow；
Current water volume in water tank q0, every pump minimum discharge lmin, every pump maximum stream flow lmax, t lag time of moisturizing, then:
Need water yields q supplemented more1=q-q0-lmin×(t-t)
Need to turn number of units n=q of pump1/〔(lmax-lmin)×(t-t)〕
The integer part of n is to turn pump number of units at full capacity；The fractional part of n is that the frequency conversion of a wherein pump gives；Remaining water pump is pressed
Minimum discharge is run.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410145529.2A CN104971947B (en) | 2014-04-10 | 2014-04-10 | Method for controlling liquid level of laminar flow water tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410145529.2A CN104971947B (en) | 2014-04-10 | 2014-04-10 | Method for controlling liquid level of laminar flow water tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104971947A CN104971947A (en) | 2015-10-14 |
| CN104971947B true CN104971947B (en) | 2017-01-25 |
Family
ID=54269227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410145529.2A Active CN104971947B (en) | 2014-04-10 | 2014-04-10 | Method for controlling liquid level of laminar flow water tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104971947B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676353A (en) * | 2020-12-03 | 2021-04-20 | 邯郸钢铁集团有限责任公司 | Computer energy-saving model based on material tracking and temperature control and use method |
| DE102022210057A1 (en) | 2022-09-23 | 2024-03-28 | Sms Group Gmbh | Method and computer program for operating a production plant for a metal product |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02207911A (en) * | 1989-02-08 | 1990-08-17 | Nippon Steel Corp | Cooling device for hot rolled steel plate |
| JP4047893B2 (en) * | 2006-05-08 | 2008-02-13 | 新日本製鐵株式会社 | Hot steel plate cooling device, hot steel plate cooling method and program |
| CN201524703U (en) * | 2009-05-26 | 2010-07-14 | 广州金关节能科技发展有限公司 | Multi-section descaling and energy-saving control device |
| CN202192104U (en) * | 2011-07-06 | 2012-04-18 | 安徽精诚铜业股份有限公司 | Electronic control system for water supply of hot rolling mill |
| 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 |
| CN103042053B (en) * | 2012-12-25 | 2015-12-02 | 东北大学 | A kind of water system parallel for ultrafast cold-peace section cooling dual system |
| CN103272857B (en) * | 2013-01-18 | 2015-12-23 | 山西太钢不锈钢股份有限公司 | A kind of for section cooling water tank method for automatic controlling liquid level |
-
2014
- 2014-04-10 CN CN201410145529.2A patent/CN104971947B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104971947A (en) | 2015-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104457073B (en) | Frequency conversion control method | |
| CN100563862C (en) | The high-pressure water descaling system of hot continuous rolling production line | |
| CN104971947B (en) | Method for controlling liquid level of laminar flow water tank | |
| CN104646420A (en) | Method for reducing cost of producing copper rod via continuous casting and continuous rolling | |
| CN105234186B (en) | Cold continuous rolling process is controlled to the rolling schedule optimization method of target with electric power consumption per ton steel | |
| CN204503751U (en) | A kind of hot-tandem unit production line reducing roller consumption | |
| CN102829330A (en) | Advanced operating method for underflow pump of ore pulp pipeline transportation system | |
| CN104894587A (en) | Strip steel pickling circulating system | |
| CN100515593C (en) | Normal four-roller hot strip steel continuous rolling mill strip steel edge thickening integrated controlling method | |
| CN103776215B (en) | A kind of circulation fluid system optimization method based on device side | |
| CN103909103A (en) | Slab descaling pump system and method | |
| CN104107865A (en) | Oil press template circulating cooling system | |
| CN206799775U (en) | Staged continuous electroplating production system is vertically plated in energy-conserving and environment-protective | |
| CN202913059U (en) | Acid mixing, washing and preparation system for hot rolled stainless band steel | |
| CN203900412U (en) | Indium ingot casting cooling system | |
| CN104624676B (en) | Energy-saving configuration method of hot-rolling descaling device | |
| CN205364500U (en) | Trinity roller mould temperature machine | |
| CN201997551U (en) | Water-cooling device for planished part | |
| CN202427713U (en) | Cooling device for hot rolling mill | |
| CN205043112U (en) | Confession liquid device that rolls is cast to magnesium alloy | |
| CN205914764U (en) | Powder metallurgical material conveyer | |
| CN203979837U (en) | A kind of for concentrating oily device | |
| CN203307876U (en) | Centralized circulating water supply system for workshop | |
| CN202945285U (en) | Circulating water system for quenching of seamless steel tubes | |
| CN203385296U (en) | Roll steel cooling system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |