CN105710143B - A kind of energy-conserving reconstruction method of the hot rolling high-pressure water descaling system based on accumulator and high voltage converter - Google Patents
A kind of energy-conserving reconstruction method of the hot rolling high-pressure water descaling system based on accumulator and high voltage converter Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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Abstract
The invention discloses a kind of energy-conserving reconstruction method of the hot rolling high-pressure water descaling system based on accumulator and high voltage converter, comprise the following steps that：Step 1: accumulator is chosen according to the de-scaling water consumption in a rolling cycle；Step 2: the lifting speed time pumped according to dephosphorization and the rotary inertia of motor choose high voltage converter；Step 3: accumulator, high voltage converter, dephosphorization pump and motor are attached matching；Step 4: the dephosphorization that have matched accumulator and high voltage converter pump is put into production use, realize energy saving；Advantage is：Using main equipment of the high voltage converter of combination accumulator system as reducing energy consumption, so that high voltage converter, reach reducing energy consumption using dephosphorization gap reduction of speed, reduction energy consumption can be better achieved on the premise of production technology is met, the purpose of energy-saving and emission-reduction, forms the whole energy modernization system that high voltage converter adds accumulator.
Description
Technical field
The invention belongs to the technical field of hot rolling high-pressure water descaling system reducing energy consumption, and in particular to one kind is based on accumulator
With the energy-conserving reconstruction method of the hot rolling high-pressure water descaling system of high voltage converter.
Background technology
On the hot-rolled strip production line of modernization, high-pressure water descaling technology is as the important hand for improving plate surface quality
Section, application are increasingly extensive.High-pressure water descaling system institute gas-distributing motor is the main power consumption rich and influential family of steel mill, at present domestic many steel
The high-pressure water descaling motor long-time power frequency constant-speed operation of factory, waste of energy are very big.Over time, the hair in epoch
Exhibition, the aggravation increasingly of steel market competition, gradual saturation, user require the product quality of steel mill higher and higher in market.It is existing
Market competition, first, the competition of product quality, second, the competition of production cost, although the product of production high quality can be lifted
Its market competitiveness, but energy-saving and current each iron and steel enterprise must face and urgent problem to be solved, it is therefore, right
Traditional high-pressure water descaling system progress reducing energy consumption is very necessary and the energy saving space is very big.
Country's Pressure Water Scale Removing mainly has two ways at present：1) de-scaling pump group+accumulator composition descaling system；This is
De-scaling water consumption matches de-scaling pump group water supply capacity at the same time with multiple spot in system, meets de-scaling needs；Accumulator only is used for balancing
System pressure, supplement short time spike water consumption, suction line shake and make up pipe valve leakage.2) de-scaling pump group directly supplies water
Form descaling system；In the system main pump group water supply capacity directly with de-scaling point needed for flow, pressure match, de-scaling interval time
Interior changes in flow rate is controlled by the variable control device of pump group.
Descaling pump all the time give birth to by power frequency constant-speed operation, in most cases hot rolling in the traditional design of two kinds of systems described above
The operating condition of producing line may have a variety of, and de-scaling requirement and water requirement under different operating modes are usually different, and system is general
All it is according to the operating condition design of de-scaling water demand maximum, this has resulted in the serious waste of system energy.
Medium Voltage Variable Frequency Speed Regulation Technology in speed adjusting performance, power savings and extends equipment by development and application for many years
The advantage of service life etc. has obtained sufficient embodiment.Therefore variable-frequency control technique is in hot rolling high-pressure water descaling system
Energy-saving application is also trend of the situation.
Operation principle and the system composition of hot rolling high-pressure water descaling system determine that its Frequency Conversion Modification must be combined with technique
Come, consider from system entirety de-scaling rhythm.The pattern of increase frequency converter is simply used, reaches energy saving using de-scaling interval reduction of speed
Purpose.Often do not reach in actual use anticipation energy-saving effect or transformation after be difficult meet technological requirement, Wu Fada
To the scale removal effect of anticipation.
The content of the invention
High-pressure water descaling scene Frequency Conversion Modification is more using simple increase high voltage converter mode at present, and this is done so that energy consumption
Become larger, based on this problem, the present invention proposes a kind of hot rolling high-pressure water descaling system based on accumulator and high voltage converter
Energy-conserving reconstruction method, comprise the following steps that：
Step 1: accumulator is chosen according to the de-scaling water consumption in a rolling cycle；
Step 101, according to rolling time-scale determine one rolling the de-scaling cycle；
The rolling de-scaling cycle includes the time and de-scaling intermittent time of each de-scaling point；
Step 102, the de-scaling flow for determining each de-scaling point in the whole rolling de-scaling cycle, and calculate theoretical total water consumption；
For certain line, according to the de-scaling flow of each de-scaling point and de-scaling time, the water consumption of each de-scaling point is calculated；
So as to calculate the theoretical total water consumption in a rolling de-scaling cycle；
Step 103, determine de-scaling point overlapping in the rolling de-scaling cycle, and calculates the water consumption of each overlapping de-scaling point；
The water consumption of each overlapping de-scaling point is：The flow of overlapping de-scaling point and it is multiplied by the overlapping de-scaling time；
Step 104, the de-scaling flow for judging each overlapping de-scaling point and the flow for whether being more than descaling pump, if it is, removing
Squama pumps and the common de-scaling of accumulator, the otherwise independent de-scaling of descaling pump；
Step 105, according to accumulator provide de-scaling flow rate calculation one roll the de-scaling cycle in accumulator it is motor-driven
Volume；
Liquid level of the motorised volume of accumulator including accumulator reaches the water supply of independent de-scaling after the upper limit, and accumulator ginseng
With the water supply of common de-scaling；
Step 106, motorised volume and gas adiabatic equation law according to accumulator, calculate accumulator and prescribe a time limit under stress
The gas volume of gas exchanges is influenced for the resistance of ducting；
Perfect gas adiabatic equation law：P*V=C
Wherein P is that the pressure of perfect gas, V are the volumes of perfect gas；C is constant.
Step 107, accumulator remove 90% according to gas volume and obtain accumulator actual demand value, according to the actual requirements
Value, chooses accumulator gas tank and air hydraulic cylinder quantity.
Step 2: high voltage converter is chosen according to the rotary inertia of the lifting speed time of descaling pump and motor；
Step 201, according to the rated power and rated speed of motor calculate Rated motor output torque Te；
Calculate as follows：
PeFor the rated power of motor, neFor the rated speed of motor；
Step 202, according to the rated speed of motor calculate motor angular velocity ω；
The π * n of ω=2e/60
Step 203, the minimum respectively in the torque capacity and moderating process in calculating descaling pump and motor accelerator turn
Square；
The torque capacity T provided in accelerator needed for frequency convertermax：
J is the sum of rotary inertia of descaling pump and motor, TLFor load torque：TL=K ω=K*2 π * ne/60；K represents single
The torque of position radian.
The minimum torque T provided in moderating process needed for frequency convertermin：
Step 204, according to the ratio between torque capacity and Rated motor torque, and minimum torque chooses high voltage converter；
By calculating, according to the ratio between torque capacity in accelerator and Rated motor torqueValue, selection conforms to
The high voltage converter asked, while calculate the minimum torque T of the high voltage converter of selectionminMeet not for negative torque；
Step 3: accumulator, high voltage converter, descaling pump and motor are attached matching；
Specially：Host computer connects PLC, and PLC connects high voltage converter, high voltage converter connection electricity by serial gateway
Machine, motor connection descaling pump, while descaling pump connection accumulator and de-scaling pipeline；High voltage converter and accumulator coherent signal are equal
Into PLC system, de-scaling is completed jointly with accumulator by high voltage converter control motor driving descaling pump.
Step 4: the descaling pump that have matched accumulator and high voltage converter is put into production use, realize energy saving；
Concretely comprise the following steps：
Step 401, rolled in the de-scaling cycle, and descaling pump high-speed cruising carries out moisturizing for accumulator first；
Step 402, judge whether run into de-scaling point during moisturizing, if run into, enters step 403, otherwise, descaling pump
High-speed cruising is kept, is accumulator moisturizing, enters step 405；
Step 403, determine whether the de-scaling flow of de-scaling point is more than the flow of descaling pump, if it is, accumulation of energy
Device and descaling pump carry out de-scaling for overlapping de-scaling point at the same time, and otherwise, descaling pump is individually for de-scaling point de-scaling；
Step 404, after completing the de-scaling of each de-scaling point, descaling pump keeps high-speed cruising, is accumulator in de-scaling gap
Moisturizing；
Step 405, when accumulator liquid level reaches upper work liquid level or pressure and reaches the upper limit, liquid level detection device output letter
PLC number is given, PLC control high voltage converters make descaling pump fall-back；
While step 406, descaling pump keep low speed operation, accumulator is individually for de-scaling point and carries out de-scaling；
Step 407, until when accumulator liquid level reaches lower work liquid-level pressure and reaches lower limit, liquid level detection device output letter
PLC number is given, PLC control high voltage converters, high voltage converter control descaling pump fall forward, is accumulator moisturizing, entrance is next
A de-scaling cycle.
The advantage of the invention is that：The present invention is using master of the high voltage converter with reference to accumulator system as reducing energy consumption
Body equipment so that high voltage converter, reaches reducing energy consumption using de-scaling gap reduction of speed, can be on the premise of production technology is met
Reduction energy consumption is better achieved, the purpose of energy-saving and emission-reduction, forms the whole energy modernization system that high voltage converter adds accumulator.
Brief description of the drawings
Fig. 1 is the energy-conserving reconstruction method stream of the hot rolling high-pressure water descaling system of the invention based on accumulator and high voltage converter
Cheng Tu；
Fig. 2 is the method flow diagram that the present invention chooses accumulator according to the de-scaling water consumption in the rolling cycle；
Fig. 3 is that the present invention chooses high voltage converter method flow diagram according to descaling pump and motor；
Fig. 4 is the descaling pump work flow diagram that the present invention will have matched accumulator and high voltage converter；
Fig. 5 is that the present invention determines rolling cycle schematic diagram according to high-pressure water descaling sequence diagram；
Fig. 6 is accumulator of the present invention, and high voltage converter, descaling pump and motor are attached matching schematic diagram.
Embodiment
Below in conjunction with attached drawing, the present invention is described in further detail.
A kind of energy-conserving reconstruction method of the hot rolling high-pressure water descaling system based on accumulator and high voltage converter of the present invention, profit
The main equipment of reducing energy consumption is used as by the use of accumulator and high voltage converter so that high voltage converter reducing energy consumption can meet to give birth to
Reduction energy consumption, the purpose of energy-saving and emission-reduction are better achieved on the premise of production. art.
As shown in Figure 1, comprise the following steps that：
Step 1: accumulator is chosen according to the de-scaling water consumption in a rolling cycle；
Specific steps are as shown in Fig. 2, as follows：
Step 101, according to rolling time-scale determine one rolling the de-scaling cycle；
The rolling de-scaling cycle includes the time and de-scaling intermittent time of each de-scaling point；
Step 102, the de-scaling flow for determining each de-scaling point in the whole rolling de-scaling cycle, and calculate theoretical total water consumption；
For certain line, according to the de-scaling flow of each de-scaling point and de-scaling time, the water consumption of each de-scaling point is calculated；
So as to calculate theoretical total water consumption and average water consumption in a rolling de-scaling cycle；
Step 103, determine de-scaling point overlapping in the rolling de-scaling cycle, and calculates the water consumption of each overlapping de-scaling point；
Concretely comprise the following steps：First, calculate and repeat the sum of corresponding de-scaling point flow of de-scaling point, by de-scaling point flow and with except
The actual flow of squama pump compares, if de-scaling point flow and the actual flow less than or equal to descaling pump, according to overlapping de-scaling point
Flow calculates overlapping water consumption with the overlapping de-scaling time is multiplied by；Otherwise, de-scaling point flow and the actual flow more than descaling pump, root
De-scaling point flow is multiplied by according to the overlapping time of overlapping de-scaling point and calculates overlapping water consumption；
Step 104, the de-scaling flow for judging each overlapping de-scaling point and the flow for whether being more than descaling pump, if it is, removing
Squama pumps and the common de-scaling of accumulator, the otherwise independent de-scaling of descaling pump；
Step 105, according to accumulator provide de-scaling flow rate calculation one roll the de-scaling cycle in accumulator it is motor-driven
Volume；
Rolled at one in the de-scaling cycle, descaling pump high-speed cruising t seconds first, carry out moisturizing for accumulator, removed when overlapping
The sum of de-scaling flow value of squama point is more than the flow of descaling pump, then accumulator and descaling pump are removed for overlapping de-scaling point at the same time
Squama, otherwise, descaling pump keep high-speed cruising, run into de-scaling point and carry out de-scaling, are accumulator moisturizing using de-scaling gap, work as frequency conversion
For energy saving consideration reduction of speed tremendously low frequency rate run time section, descaling pump minimum flow valve are closed, de-scaling pumping plant no longer exports device, this
When de-scaling is responsible for by accumulator system.The total water consumption of overlapping de-scaling point rejects output flow of the descaling pump in overlapping point, remaining
Water supply of the part i.e. as accumulator.
The water supply of descaling pump is multiplied by the de-scaling time by the actual flow of descaling pump and obtains；The de-scaling time includes high-speed cruising
Time t second, accumulator and descaling pump carry out the time of de-scaling for overlapping de-scaling point at the same time；
Step 106, motorised volume and gas adiabatic equation law according to accumulator, calculate accumulator and prescribe a time limit under stress
The gas volume of gas exchanges is influenced for the resistance of ducting；
Perfect gas adiabatic equation law：P*V=C
Wherein P is that the pressure of perfect gas, V are the volumes of perfect gas；C is constant, i.e. pressure volume before de-scaling
Product and the product of pressure volume after de-scaling are a definite values (in the ideal situation, without considering system loss)
Liquid volume is big in accumulator system before de-scaling, and the volume V of gas is small, and pressure P is big, after de-scaling, liquid
Liquid level declines, gas volume V increases, but pressure P reduces at the same time；
So volume V=C after pressure P* de-scalings after de-scaling fore pressure p* de-scaling front volume V=de-scalings.
Step 107, accumulator remove 90% according to gas volume and obtain accumulator actual demand value, according to the actual requirements
Value, chooses accumulator gas tank and air hydraulic cylinder quantity.
Step 2: high voltage converter is chosen according to descaling pump lifting speed time and motor rotary inertia；
Specific steps are as shown in figure 3, as follows：
Step 201, according to the rated power and rated speed of motor calculate Rated motor output torque Te；
Calculate as follows：
PeFor the rated power of motor, neFor the rated speed of motor；
Step 202, according to the rated speed of motor calculate motor angular velocity ω；
The π * n of ω=2e/60
Step 203, the minimum respectively in the torque capacity and moderating process in calculating descaling pump and motor accelerator turn
Square；
The torque capacity T that descaling pump and motor are provided in acceleratormax：
J is the sum of rotary inertia of descaling pump and motor, TLFor load torque：TL=K ω=K*2 π * ne/60；K represents single
The torque of position radian, unit Nm/rad；Utilize load torque TLConsider the state of operation maximum (top) speed, K values are calculated, as rear
The continuous units of torque constant for calculating acceleration and deceleration process.
The minimum torque T that descaling pump and motor are provided in moderating processmin：
Step 204, according to the ratio between torque capacity and Rated motor torque, and minimum torque chooses high voltage converter；
By calculating, according to the ratio between torque capacity in accelerator and Rated motor torqueValue, selection conforms to
The high voltage converter asked, while calculate the minimum torque T of the high voltage converter of selectionminMeet not for negative torque；
Detailed process is as follows：
Judge the ratio between torque capacity and Rated motor torqueWhether high voltage converter itself overload magnification is less than, if
Then to illustrate torque capacity within the scope of frequency conversion system overload capacity, frequency converter choose meets standard, with accumulator can
Match somebody with somebody, meet de-scaling water supply requirement, it is common to complete de-scaling task.Otherwise frequency converter can not complete speed-raising process in accelerating sections,
After de-scaling starts, it is impossible to supply water jointly for de-scaling point with accumulator, cause de-scaling flow and pressure to be unsatisfactory for process conditions, can not
Whole de-scaling process is completed, it is necessary to which return to step 203, recalculates selection high voltage converter.
The minimum torque T provided in moderating process is provided at the same timeminWhether it is negative torque, if so, explanation frequency converter is chosen
It is not inconsistent standardization, can occurs energy feedback phenomenon in the process of running, influence system operation, to recalculate selection, otherwise, most
Small torque is not negative torque, and frequency converter, which is chosen, meets standard, is not in energy feedback phenomenon.
Step 3: accumulator, high voltage converter, descaling pump and motor are attached matching；
As shown in fig. 6, it is specially：Host computer connects PLC, and PLC connects high voltage converter, high-pressure frequency-conversion by serial gateway
Device connects high pressure descaling motor, high pressure descaling motor connection the high pressure divideds by the scale pump, while the high pressure divideds by the scale pump connection accumulator and de-scaling
Pipeline；High voltage converter enters PLC system with accumulator coherent signal, is removed by the high-voltage motor driving of high voltage converter control
Squama is pumped completes de-scaling jointly with accumulator.
Step 4: the descaling pump that have matched accumulator and high voltage converter is put into production use, realize energy saving；
As shown in figure 4, concretely comprise the following steps：
Step 401, rolled in the de-scaling cycle, and descaling pump high-speed cruising carries out moisturizing for accumulator first；
Step 402, judge whether run into de-scaling point during moisturizing, if run into, enters step 403, otherwise, descaling pump
High-speed cruising is kept, is accumulator moisturizing, enters step 405；
Step 403, determine whether the de-scaling flow of de-scaling point is more than the flow of descaling pump, if it is, accumulation of energy
Device and descaling pump carry out de-scaling for overlapping de-scaling point at the same time, and otherwise, descaling pump is individually for de-scaling point de-scaling；
Step 404, after completing the de-scaling of each de-scaling point, descaling pump keeps high-speed cruising, is accumulator in de-scaling gap
Moisturizing；
Step 405, when accumulator liquid level reaches upper work liquid level or pressure and reaches the upper limit, liquid level detection device output letter
PLC number is given, PLC control high voltage converters make descaling pump fall-back；
While step 406, descaling pump keep low speed operation, accumulator is individually for de-scaling point and carries out de-scaling；
Step 407, until when accumulator liquid level reaches lower work liquid-level pressure and reaches lower limit, liquid level detection device output letter
PLC number is given, PLC control high voltage converters, high voltage converter control descaling pump fall forward, is accumulator moisturizing, entrance is next
A de-scaling cycle.
Concrete operations are：In de-scaling gap, the rotating speed of the high pressure divideds by the scale pump is adjusted according to accumulator liquid level or pressure, works as storage
Can device liquid level reach work liquid level or when pressure reaches the upper limit, it is not necessary to de-scaling water supplying pump, liquid level detection device output signal
To high voltage converter, descaling pump fall-back is controlled；When accumulator liquid level, which reaches lower work liquid-level pressure, reaches lower limit, liquid level
Detection device outputs signal to high voltage converter, and high voltage converter control descaling pump fall forward, is accumulator moisturizing, it is ensured that
Before next de-scaling cycle starts next de-scaling cycle is completed jointly with accumulator after completion moisturizing process or raising speed.
The low speed run time calculation formula of descaling pump is：M- pump speed up time-pump during m- water supplying pump during the rolling cycle
Deceleration time；
The energy-saving run time is：Low speed run time+(pump speed up time+pump deceleration time)/2；
According to formula：W power frequencies=voltage * running current * 1.732* power factor * run times, calculate power frequency year consumption
Electricity；According to formula W frequency conversion (considering high low speed operation accounting)=voltage * rated current * 1.732* speed ratios3* power factor *
Energy-saving run time/frequency converter efficiency calculation becomes power consumption in consecutive years；Year economize on electricity is calculated according to formula W section=W power frequencies-W frequency conversions
Amount；W section * unit price of power=energy saving expense.
Embodiment：
Certain project is combined from energy high voltage converter (AriVert series) with Chongqing Water Pump Factory's accumulator system and Beijing gold
Exemplified by de-scaling transformation：
The high voltage converter of structure adds the whole energy modernization system of accumulator, including automated system, high voltage converter,
High-voltage motor, de-scaling pumping plant, accumulator system and each de-scaling point.Wherein, high voltage converter and accumulator coherent signal into
Enter PLC systems.
The first step, according in a rolling cycle de-scaling water consumption choose accumulator；
As shown in figure 5, determine that the rolling cycle is 134S；The de-scaling time that de-scaling point HSB needs is 13s, de-scaling point HSB
With the de-scaling interval 17 seconds of de-scaling point E1-1；The de-scaling time of de-scaling point E1-1 is 14s, de-scaling point E1-1 and de-scaling point E1-3
Interval 35 seconds；The de-scaling time of de-scaling point E1-3 is the interval 38 seconds of 17s, de-scaling point E1-3 and de-scaling point E1-5；
The overall de-scaling time of each de-scaling point in one cycle, T=13+17+14+35+17+38=134S；
The E1-5 in a upper de-scaling cycle was overlapped in this cycle, and the E1-5 de-scaling times are 18S；Although FSB is within the cycle
The de-scaling of overall 90S is not completed, the real time only has 59S, but the remaining 31S de-scalings time-interleaving in upper a cycle exists
In this cycle, therefore the de-scaling time in FSB unit periods is 59+31=90S；
First, all de-scaling point theory total water consumptions within a rolling cycle are analyzed, as shown in table 1：
Table 1
Then, according to rolling the overlapping de-scaling point of time chart analysis and calculating the overlapping water consumption of de-scaling, descaling pump height is judged
Fast water supply time section：FSB+E1/3 overlapping times are 17S, de-scaling flow and the flow less than pump, so when descaling pump individually remove
Squama, keeps descaling pump to run on low speed segment；FSB+E1/5+HSB overlapping times are 13S, de-scaling flow and more than descaling pump
Flow, so when need descaling pump and the common de-scaling of accumulator, descaling pump runs on water supply time section.As shown in table 2；
Table 2
| De-scaling point | De-scaling flow and (L/S) | Compared with the flow of pump | Overlapping time | Water consumption L |
| FSB+E1/3 | 66.06 | <83.3L/S | 17 | 1123.02 |
| FSB+E1/5+HSB | 142.606 | >83.3L/S | 13 | 1853.88 |
The high low speed run time of descaling pump is calculated, as shown in table 3：
Table 3
| Rolling cycle S | 134 |
| Theoretical de-scaling water consumption L | 6128.75 |
| Pump high-speed cruising time S | 72.4 |
| Pump speed up time S | 8 |
| Pump deceleration time S | 12 |
| Low speed run time S | 134-72.4-8-12=41.6 |
| Energy-saving run time S | 41.6+ (8+12)/2=51.6 |
According to rolling line high-pressure water descaling technique, in addition to finish rolling FSB de-scaling points, the time of remaining rolling line de-scaling is short, accumulator,
Be spaced it is different in size, it is more scattered, in order to reduce energy consumption, extend the low speed run time of descaling pump, scattered de-scaling used
Accumulator supplies water.Steady, energy saving upper consideration is transported from system, accumulator is the bigger the better, but invests and increase, therefore reasonably selects accumulation of energy
The size of device is particularly significant.In order to effectively energy saving, extend the low speed run time of descaling pump as far as possible, from upper calculating, rolled at one
In cycle processed, descaling pump maximum low speed run time is 41.6S, and the maximum water consumption of de-scaling is consumed when FSB+E1/5+HSB is overlapping
Water is maximum, and energy storage pressure declines too fast in order to prevent, is supplied water at the same time using descaling pump and accumulator at this time, it is ensured that system is transported
Row is steady.
Optimum operating mode is, 10 seconds before de-scaling HSB injection valves are opened after stove, descaling pump raising speed to 50HZ is run, de-scaling
Pump first mends some water for accumulator, is analyzed from rolling sequence diagram and descaling pump converting operation figure, when HSB injection valves are opened,
Overlapping 3 points of operation 13S of de-scaling point FSB+E1/5+HSB, 3 points of flows needed and the flow more than descaling pump, so needing to remove
Squama pumps and accumulator supplies water at the same time, and when de-scaling point HSB de-scalings terminate, only 2 points of FSB+E1-5 carries out overlapping de-scaling, less than pump
Flow, time 18-13=5S, water descaling pump itself ability needed at this time is to meet, accumulator is without supplying
Water, descaling pump are that accumulator supplies water in de-scaling, and in de-scaling gap, descaling pump supplies water for accumulator always, and the later stage removes
The flow of squama point E1/1 is less than the flow of pump, and accumulator need not supply water.Until after descaling pump high-speed cruising 72.4S, accumulator
Basically reaching the liquid level upper limit, then liquid level detection device outputs signal to high voltage converter, controls descaling pump reduction of speed, after reduction of speed 12S,
The liquid level upper limit is fully achieved in accumulator, and descaling pump keeps low speed 20HZ operations.Accumulator carries out removing for 59S for de-scaling point FSB
Squama, de-scaling point E1/3 de-scaling 17S, after descaling pump low speed runs 41.6S, the liquid level in accumulator reaches lower limit, level sensing
Apparatus output signal controls descaling pump raising speed to high voltage converter, and after raising speed 8S, descaling pump keeps high-speed cruising 10 seconds again,
Some water are mended for accumulator, into next de-scaling cycle.
So the water supply of accumulator has 3 points of overlapping operation 13S of FSB de-scalings 59S, E1/3 de-scaling 17S, FSB+E1/5+HSB.
Analyzed from table 4 and calculate accumulator rate of water make-up：
Table 4
| De-scaling point | De-scaling flow (L/S) | The de-scaling time | Total amount L |
| FSB de-scaling water consumptions | 46.26 | 59 | 2729.34 |
| E1/3 de-scaling water consumptions | 19.8 | 17 | 336.6 |
| FSB+E1/5+HSB de-scaling water consumptions | 142.61 | 13 | 1853.93 |
| Accumulator carries out the water consumption of de-scaling needs | 4919.87 | ||
| De-scaling water supplying pump | 83.3 | 23 | 1915.9 |
| Accumulator supplies water | 3004 |
Overlapping time 13S starts the preceding 10 seconds high-speed cruising time plus HSB de-scalings in de-scaling water supplying pump 23S times, that is, table 2,
I.e. the high-speed cruising water supply time of descaling pump is 13+10=23S.
Finally, according to production technology pressure requirements and gas adiabatic equation law, calculate accumulator and use in limited time under stress
The gas volume of gas exchanges is influenced in the resistance of ducting；By calculating, accumulator removes 90% according to gas volume and obtains accumulation of energy
Device actual demand value, is worth according to the actual requirements, chooses accumulator gas tank and air hydraulic cylinder quantity.
The maximum pressure of initialization system is 20.5MPa, and the pressure oscillation of accumulator is 8%, i.e. minimum pressure is
18.86MPa, the motorised volume 3004L of accumulator, according to perfect gas adiabatic equation law：P*V=C can be obtained：P high * V high=P
Low * V are low, and have V it is low=V high+motorised volume, by calculate, gas volume of the accumulator in 18.86MPa is 32412L,
Gas exchanges are influenced for the resistance of ducting, the moisturizing ability of normal accumulator is the 90% of calculated value, it is therefore desirable to gas volume
For 36013L (32412L ÷ 90%).Accumulator volume is larger, it is necessary to which 2 water pots, the minimum moisture storage capacity of each water pot (are pacified
Full liquid level) be about 3000L, then the total measurement (volume) of accumulator is 42013L, considers system margin, and accumulator system aggregate demand is about
43m3。
Existing accumulator 18m3, it is therefore desirable to increase the accumulator of 25m3, according to the common volume of accumulator, and fully examine
Consider the demand that rolling line rolls different steel grades, newly increase the accumulator of 4 8m3,1 air hydraulic cylinder, 3 gas tanks.
Step 2: high voltage converter is chosen according to acceleration and deceleration time and motor rotary inertia；
Descaling pump needs to complete band load acceleration and deceleration in a short time, accelerates to slow down with 12S, it is necessary to complete 8S as shown in Figure 4
(velocity interval 20Hz-50Hz).
Need to carry out type selecting to frequency converter according to the technical requirements.
Device parameter：
First, frequency converter output torque is T, load torque TLAccording to, it is known that blower-pump load curve is the 1 of frequency
Secondary, 1.7 times or 2 relations, consider most harsh 1 curve of situation, i.e. TL=K ω=K*2 π * ne/ 60, pass through the equation of motion
：
The sum of rotary inertia of descaling pump and motor is J=250kgm2, JMotor=200kgm2, consider intermediate link and
The rotary inertia of pump, appropriate increase；
By the parameter of electric machine：Motor rated power Pe=2800KW, Rated motor rotating speed ne=1494r/min, therefore, motor
Nominal torqueNumber of pole-pairs Np=2,
When descaling pump operates in neDuring=1494r/min, corresponding load torque is Te=17898Nm,
Therefore：TL=Te=K*2 π * ne/ 60, therefore K=114.4Nm/ radians.
The corresponding motor angular velocities of 20Hz are ω20=62.58 radians/s, the corresponding motor angular velocities of 50Hz are ω50=
156.45 radian/s,
Therefore：The angular acceleration that the 8S times accelerate to 50Hz from 20Hz is：
The angular acceleration that the 12S times decelerate to 20Hz from 50Hz is：
The sum of the rotary inertia of known descaling pump and motor J=250kgm2
Accelerating sections is analyzed：
The torque that required frequency converter provides
Work as ωeDuring=156.45 radians/s, the torque of required offer is up to：Tmax=20830Nm
Braking section is analyzed：
The torque that required frequency converter provides is
As ω=62.58 radians/s, the torque of required offer is minimum：Tmin=5359Nm is not negative torque, therefore not
Energy feedback phenomenon occurs.
120% can run 120s in view of frequency converter overload, thus, it is supposed that the torque that is gone out of frequency converter with electric current into just
Than, then：The ratio between torque capacity provided in accelerator and Rated motor torque are：
Therefore high voltage frequency conversion system can realize the acceleration-deceleration change of technological requirement, be matched with accumulator system proper.
Step 3: accumulator, high voltage converter, descaling pump and motor are attached matching；
Specially：High voltage converter connects motor, motor connection descaling pump, while descaling pump connection accumulator and de-scaling pipe
Road；The motor selects high-voltage motor；High voltage converter enters PLC system with accumulator coherent signal, by high-pressure frequency-conversion
The high-voltage motor driving descaling pump of device control completes de-scaling jointly with accumulator.
Specifically used environment is：The accumulator air hydraulic cylinder and gas tank that will be chosen, and corresponding air compressor machine, lowest liquid level valve,
Gate valve, maintenance air lock valve, blowdown valve etc. is exported to be connected, newly-increased accumulator system is connected with main line, original pump group injection valve,
High-low pressure pipeline is constant.
Lubricating system is transformed：Lubricating system includes maintenance mechanical oil pump and electric oil pump, after being changed to frequency conversion, according to actual feelings
Condition calculating machine oil pump changes because of acceptor's motor speed, if can cause to supply shortage of oil, can not meet service requirement, increase as one sees fit
Electric oil pump.System has a power failure suddenly in order to prevent, it is therefore desirable to increases corresponding high-order self-sealing fuel tank.
Low-voltage electrical is transformed：Low-pressure section mainly increases grease pump, automatic valve, instrument control, control system program
Modification, increase part PLC control modules, major control cabinet and equipment fully reuse.
High-voltage electrical apparatus is transformed：High pressure transformation part increase high voltage converter, connection control is chain, to control descaling pump electric
Machine, achievees the purpose that frequency control.
Due to de-scaling revolution speed and the directly proportional relation of flow that pumps, the pressure of revolution speed and pump into square relation, pump
Rotating speed is three cubed relation with pumping consumed power, therefore, when de-scaling water supplying pump is not required in system, by reducing descaling pump
Rotating speed, the shaft power of descaling pump can be greatly reduced, to achieve the purpose that energy saving of system.
It can be seen that from descaling pump water-horse power calculation formula：
The water-horse power Ne=pump pressures H of the descaling pump × 3.67 ÷ efficiency of pumps of flow Q ÷
Wherein：The water-horse power unit of pump is kW, and pump pressure unit of force is MPa, flux unit m3/h
Descaling system pump group is in high-speed cruising state all the time before transformation, in rolling line not de-scaling and rolling line roll change or rolling line
Failure light maintenance time (i.e. other downtimes) de-scaling point is unable to termination of pumping without high pressure water again when, original pump can only be in the small flow of high speed
Point operation, pump discharge very little, pump pressure is high, and minimum flow valve is opened, and power of motor is about specified 50%-60%, and energy consumption is same
Sample is very big.
Step 4: the descaling pump that have matched accumulator and high voltage converter is put into production use, realize energy saving；
Concrete operations are：In de-scaling gap, high-voltage frequency conversion and speed-adjusting control de-scaling pump rotary speed, according to accumulator liquid level or
Pressure adjusts the rotating speed of the high pressure divideds by the scale pump, when accumulator liquid level, which reaches upper work liquid level or pressure, reaches the upper limit, it is not necessary to remove
Squama water supplying pump, high voltage converter control descaling pump fall-back；Reach lower limit when accumulator liquid level reaches lower work liquid-level pressure
When, high voltage converter control descaling pump fall forward, is accumulator moisturizing, it is ensured that completes to mend before in next de-scaling cycle starting
Complete next de-scaling cycle after water process or raising speed jointly with accumulator.
Frequency control reaches the three energy saving purposes of aspect in hot rolling high-pressure water descaling system：
It is energy saving in 1 operation of rolling
In the operation of rolling, after accumulator fills water, PLC is fed back to by heat inspection signal, detection de-scaling point does not have to high pressure
During water, there is certain intermittent time (rolling in sequence diagram, de-scaling interval time on rolling line) in centre, at this moment pump can be turned
Prompt drop is low so that pump is run in low speed, when heat detects that product will reach when de-scaling point needs de-scaling or the water of accumulator
When inadequate, pump starts raising speed, supplies water to accumulator moisturizing, while to rolling line, longer in the time of low speed operation, energy saving to get over
Greatly.
2 using roll change, maintenance when pump cannot stop when reduce motor speed it is energy saving
It is out of order the light maintenance time (i.e. other downtimes), each half an hour or 1 hour in rolling line roll change or rolling line
Left and right, de-scaling point do not have to high pressure water, and when being unable to termination of pumping, at this moment frequency converter reduces revolution speed, energy-saving run.Pass through related number
According to statistics, the annual roll change of rolling line, the size repair time accumulation be up to 900-1000 it is small when, the energy saving space is huge.
3 reach energy saving purpose by rolling the steel grade change de-scaling pressure of different cultivars
All it is by being most difficult to the steel grade design pressure of de-scaling, carry out design selection system by most fast pace during system initial design
Device configuration, when such different cultivars steel still uses same pressure flow pattern, will result in great waste.Due to rolling
Line rolling species is various, diversification of varieties, and high-pressure water descaling system can be controlled according to the difference of rolling species by high-pressure frequency-conversion
The flow and pressure of high-pressure pump processed, to reach targetedly de-scaling purpose.
When it is not very high to roll variety steel de-scaling pressure requirements, some steel grades may 16-18MPa when de-scaling just meet
It require that, some steel grades need the higher pressure of any again, at this moment are just very easy to realize by frequency control, pressure reduces
1MPa, power of motor will drop very much.
It is single that speed governing is controlled using high-pressure frequency-conversion mode, since rolling rhythm interval is shorter, and often there is multiple spot at the same time
The situation of de-scaling, high voltage converter deceleration time is relatively short, has a significant impact to energy-saving effect.The present invention passes through high-pressure frequency-conversion
Device controls descaling pump lifting speed, reaches stability contorting output pressure, ensures output flow, and reach energy saving effect, Ci Zhongjie
Can transform pattern increase high voltage converter mode single better than tradition.
Claims (2)
1. a kind of energy-conserving reconstruction method of the hot rolling high-pressure water descaling system based on accumulator and high voltage converter, its feature exist
In comprising the following steps that：
Step 1: accumulator is chosen according to the de-scaling water consumption in a rolling cycle；
Step 2: high voltage converter is chosen according to the rotary inertia of the lifting speed time of descaling pump and motor；
Specially：
Step 201, according to the rated power and rated speed of motor calculate Rated motor output torque Te；
Calculate as follows：
PeFor the rated power of motor, neFor the rated speed of motor；
Step 202, according to the rated speed of motor calculate motor angular velocity ω；
The π * n of ω=2e/60
Step 203, the respectively minimum torque in the torque capacity and moderating process in calculating descaling pump and motor accelerator；
The torque capacity T provided in accelerator needed for frequency convertermax：
J is the sum of rotary inertia of descaling pump and motor, TLFor load torque：TL=K ω=K*2 π * ne/60；K represents unit arc
The torque of degree；
The minimum torque T provided in moderating process needed for frequency convertermin：
Step 204, according to the ratio between torque capacity and Rated motor output torque, and high voltage converter is chosen in minimum torque；
By calculating, according to the ratio between torque capacity in accelerator and Rated motor output torqueValue, selection meets the requirements
High voltage converter, while calculate the minimum torque T of the high voltage converter of selectionminMeet not for negative torque；
Step 3: accumulator, high voltage converter, descaling pump and motor are attached matching；
Specially：Host computer connects PLC, and PLC connects high voltage converter, high voltage converter connection motor, electricity by serial gateway
Machine connects descaling pump, while descaling pump connection accumulator and de-scaling pipeline；High voltage converter enters with accumulator coherent signal
PLC system, de-scaling is completed by high voltage converter control motor driving descaling pump jointly with accumulator；
Step 4: the descaling pump that have matched accumulator and high voltage converter is put into production use, realize energy saving；
Concretely comprise the following steps：
Step 401, rolled in the de-scaling cycle, and descaling pump high-speed cruising carries out moisturizing for accumulator first；
Step 402, judge whether run into de-scaling point during moisturizing, if run into, enters step 403, and otherwise, descaling pump is kept
High-speed cruising, is accumulator moisturizing, enters step 405；
Step 403, determine whether de-scaling point de-scaling flow whether be more than descaling pump flow, if it is, accumulator and
Descaling pump carries out de-scaling for overlapping de-scaling point at the same time, and otherwise, descaling pump is individually for de-scaling point de-scaling；
Step 404, after completing the de-scaling of each de-scaling point, descaling pump keeps high-speed cruising, is accumulator moisturizing in de-scaling gap；
Step 405, when accumulator liquid level reaches upper work liquid level or pressure and reaches the upper limit, liquid level detection device outputs signal to
PLC, PLC control high voltage converter make descaling pump fall-back；
While step 406, descaling pump keep low speed operation, accumulator is individually for de-scaling point and carries out de-scaling；
Step 407, until when accumulator liquid level reaches lower work liquid level or pressure and reaches lower limit, liquid level detection device output signal
To PLC, PLC control high voltage converters make descaling pump fall forward, are accumulator moisturizing, into next de-scaling cycle.
2. a kind of the energy saving of hot rolling high-pressure water descaling system based on accumulator and high voltage converter as claimed in claim 1 changes
Make method, it is characterised in that the step one is specially：
Step 101, according to rolling time-scale determine one rolling the de-scaling cycle；
The rolling de-scaling cycle includes the time and de-scaling intermittent time of each de-scaling point；
Step 102, the de-scaling flow for determining each de-scaling point in the whole rolling de-scaling cycle, and calculate theoretical total water consumption；
For certain line, according to the de-scaling flow of each de-scaling point and de-scaling time, the water consumption of each de-scaling point is calculated；So as to
Calculate the theoretical total water consumption in a rolling de-scaling cycle；
Step 103, determine de-scaling point overlapping in the rolling de-scaling cycle, and calculates the water consumption of each overlapping de-scaling point；
The water consumption of each overlapping de-scaling point is：The flow of overlapping de-scaling point and it is multiplied by the overlapping de-scaling time；
Step 104, the de-scaling flow for judging each overlapping de-scaling point and the flow for whether being more than descaling pump, if it is, descaling pump
With the common de-scaling of accumulator, the otherwise independent de-scaling of descaling pump；
Step 105, the motorised volume according to the de-scaling flow rate calculation that accumulator provides accumulator within a rolling de-scaling cycle；
Liquid level of the motorised volume of accumulator including accumulator reaches the water supply of independent de-scaling after the upper limit, and accumulator participates in altogether
With the water supply of de-scaling；
Step 106, motorised volume and gas adiabatic equation law according to accumulator, calculate accumulator and are used in limited time under stress
The resistance of ducting influences the gas volume of gas exchanges；
Perfect gas adiabatic equation law：P*V=C
Wherein P is that the pressure of perfect gas, V are the volumes of perfect gas；C is constant；
Step 107, accumulator remove 90% according to gas volume and obtain accumulator actual demand value, are worth according to the actual requirements, select
Take accumulator gas tank and air hydraulic cylinder quantity.
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| CN108941223A (en) * | 2018-06-13 | 2018-12-07 | 本钢板材股份有限公司 | A kind of hot-rolling descaler motor power saving control method |
| CN109500107A (en) * | 2018-12-06 | 2019-03-22 | 山西太钢不锈钢股份有限公司 | A kind of surface descaling system of stainless steel slab |
| CN111715711B (en) * | 2020-05-06 | 2022-03-29 | 唐山钢铁集团有限责任公司 | Efficient descaling control method for hot-rolled strip production line |
| CN113290044B (en) * | 2021-05-24 | 2023-03-28 | 河北宇禾科技有限公司 | Production equipment and process of ribbed cold-rolled steel bar |
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| US4188812A (en) * | 1979-01-03 | 1980-02-19 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Installation for production of continuously cold rolled sheet metal or strip |
| JPH06179014A (en) * | 1992-12-10 | 1994-06-28 | Nireco Corp | Descaling device |
| CN101497086B (en) * | 2009-03-06 | 2011-06-15 | 中冶赛迪工程技术股份有限公司 | High-pressure water descaling system |
| 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 |
| CN104624676B (en) * | 2013-11-15 | 2017-02-01 | 上海梅山钢铁股份有限公司 | Energy-saving configuration method of hot-rolling descaling device |
| CN103909103A (en) * | 2014-02-12 | 2014-07-09 | 上海宝菱电气控制设备有限公司 | Slab descaling pump system and method |
| CN104209354B (en) * | 2014-07-17 | 2015-12-30 | 镇江金昶坤能源设备有限公司 | The water jet pump energy-saving control method of steel rolling descaling system |
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