CN101921886A - Method for controlling coal injecting rate of blast furnace - Google Patents

Method for controlling coal injecting rate of blast furnace Download PDF

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Publication number
CN101921886A
CN101921886A CN 201010246296 CN201010246296A CN101921886A CN 101921886 A CN101921886 A CN 101921886A CN 201010246296 CN201010246296 CN 201010246296 CN 201010246296 A CN201010246296 A CN 201010246296A CN 101921886 A CN101921886 A CN 101921886A
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China
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tank pressure
value
injection rate
ting
pressure
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CN 201010246296
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Chinese (zh)
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CN101921886B (en
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李泽辉
强健
闫朝付
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中冶南方工程技术有限公司
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Abstract

The invention relates to a method for controlling the coal injecting rate of a blast furnace, which is used for mainly controlling an air supply regulating valve, a small diffusion stop valve, a fluidization regulating valve and a conveyed air regulating valve to realize the control for the injecting rate by adopting a parallel-connection injection mode with more than two tanks. The method comprises the following steps of: stabilizing the pressure of injecting tanks by regulating the air supply regulating valve and the small diffusion stop valve, stabilizing the air carrier volume by regulating the conveyed air regulating valve, and then forming a PID (Proportion Integration Differentiation) cascade control loop by regulating the injecting rate and the fluidized air flow under the conditions of the stable pressure and air carrier volume of the injecting tanks, wherein the PID cascade control loop is used for rapidly and uniformly regulating the injecting rate; and processing the relation among the tank pressure, the air carrier volume and the fluidized air flow with the injecting rate in a production process according to the process requirement so that the injecting rate is effectively controlled, thereby creating conditions for the smooth production of the blast furnace. The method can effectively prevent furnace pressure fluctuation from interfering the injecting rate and prevent hysteresis and great fluctuation generated in the regulation process of the tank pressure, ensures the rapid, stable and uniform regulation of the tank pressure, and has simple process.

Description

Method for controlling coal injecting rate of blast furnace
Technical field
The present invention relates to blast furnace automatic control technology field, particularly relate to a kind of method for controlling coal injecting rate of blast furnace.
Background technology
Furnace coal spraying technology is the key link of blast furnace system composition optimizes, has to reduce coke ratio significantly, increase economic efficiency, alleviate advantages such as environmental pollution.The coal powder injection technology is one of three big important technology routes of China's steel industry development as the megatrend of blast furnace technology development both at home and abroad.Along with the coal powder injection technology to big injection rate concentrated phase developer conveying direction, how to stablize, regulate coal powder blowing amount evenly, exactly, be keep furnace temperature stable, guarantee furnace condition anterograde, make blast furnace reach the important foundation of best smelting state.
Current, China's pulverized coal injection automatic control technology level is comparatively weak, detection and production process that most of production process lacks the key process parameter injecting coal quantity have the characteristics of multivariate, tight coupling, the control that injecting coal quantity is regulated is subjected to the fluctuation of coal dust ature of coal, flowing property, humidity, granularity, conditions of blast furnace, very big influences the such as accuracy of detection, divider or spray gun obstruction of winding-up amount easily, therefore be difficult to obtain precise math model, make to the control ratio of winding-up amount difficult, all not good to winding-up amount control effect at present.Therefore, how to adopt a kind of control method to guarantee that the stable of bf coal injection system injection rate just seems particularly important.
At present, the control of pulverized coal injection rate mainly is to adopt the mode of adjusting delivery of carrier gas amount and blowing tank pressure, promptly by adjusting tank pressure and carrying the size of tolerance to change injecting coal quantity.Generally speaking, the control of injection rate is exactly to rely on artificial experience or automanual mode to fix the delivery air amount, compare with actual measurement winding-up amount and setting winding-up amount then, control tank pressure with proportion integration differentiation (PID) algorithm, and the control of tank pressure is to realize by the adjusting to air compensation, for this regulative mode when the coal powder injection rate departs from set(ting)value, sequence of control can strengthen or reduce the tank pressure set(ting)value automatically, tonifying Qi this moment variable valve can be regulated according to the deviation of tank pressure actual value and set(ting)value, because changing tank pressure by air compensation is process more slowly, simultaneously owing to there is not injection rate on-line detector table, the calculating of injection rate has hysteresis, therefore for changing injection rate especially big Delay Process especially; On the other hand, when tank pressure when slowly increasing, injection rate but can't improve immediately, cause air compensation to continue to increase, and reach the set(ting)value of expection when injection rate after, this moment is because tank pressure has reached the setting tank pressure, but this moment, aeration valve was not to close immediately but keep and then slowly close, cause tank pressure still increasing, injection rate constantly rises, and produces significantly hyperharmonic fluctuation.Only can't realize winding-up amount stable and uniform is controlled according to above analysis explanation by conventional PID control, and have serious the hysteresis, and easily causing the fluctuation of winding-up amount, coal dust stops up, thereby influence the ordinary production of blast furnace, even the destruction working of a furnace causes damping down.
Engineering experience before analyze summing up needs irrational place is improved and optimized, and uses a kind of new master mode to solve the problem that injecting coal quantity fluctuates, for blast furnace stable smooth operation high yield and low cost creates conditions.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method for controlling coal injecting rate of blast furnace is provided, this method can be stablized, regulate control evenly, exactly coal powder blowing amount in the blast furnace ironmaking coal injection system, and then keeps furnace temperature and stablize, make blast furnace to reach best smelting state.
The present invention solves its technical problem and adopts following technical scheme:
Method for controlling coal injecting rate of blast furnace provided by the invention, it adopts the winding-up pattern in parallel that (comprises two jars) more than two jars, mainly is to the tonifying Qi variable valve, diffuses trip valve, fluidisation variable valve and carry the control of gas variable valve to realize control to injection rate for a short time; By regulating the tonifying Qi variable valve, diffusing trip valve for a short time and stablize injection tank pressure, carry the gas variable valve to stablize load volume by regulating, under the situation of stablizing injection tank pressure and load volume, injection rate and fluidized gas Flow-rate adjustment constitute PID tandem control loop, in order to regulate injection rate rapidly and uniformly; In process of production, the relation according to processing requirement processing tank pressure, load volume and fluidized gas flow three and injection rate is controlled effectively injection rate, thereby is smooth required the creating conditions of producing of blast furnace.
The present invention can adopt the method that may further comprise the steps:
The first step, determine the differential pressure setpoint of injection tank pressure and blast furnace furnace pressure:
The setting of tank pressure is converted into setting to tank pressure and furnace pressure differential pressure, and with the set(ting)value of the described differential pressure step function as injection rate, the set(ting)value of tank pressure is the set(ting)value and the furnace pressure sum of differential pressure;
In second step, regulate injection tank pressure:
By the pressurising pipeline winding-up jar is pressurized to the tank pressure set(ting)value, in the winding-up process, open the ftercompction trip valve, adopt apery worker intelligent rules control method injection tank pressure to be regulated to tank pressure, produce when avoiding adopting PID regulating and controlling tank pressure and lag behind and fluctuation by regulating the ftercompction variable valve;
In the 3rd step, regulate load volume:
According to the load volume increase then injection rate reduce, load volume reduces then that injection rate increases this ultimate principle and service experience, with the set(ting)value of the load volume step function as injection rate; And adopt PID single loop control mode that load volume is controlled, at this moment, this regulating loop needs valve opening is done minimum amplitude limit control, causes coal dust to stop up in case carry atmospheric pressure to reduce;
In the 4th step, regulate injection rate with cascade PID loop control mode:
With the ordering parameter of fluidized gas flow as the injection rate temporal variation, constitute the cascade PID Controlling System, to carry out amplitude limit to the fluidisation variable valve simultaneously, prevent that fluidization gas is too small or excessive.
The present invention a kind ofly has the characteristics of multivariate, tight coupling at the coal powder injection production process, and the adjusting control of injecting coal quantity is subjected to the influence of outer work condition easily, and the brand-new control scheme that proposes.Compared with prior art, have following main beneficial effect:
1. pressure differential resetting will be converted into to the setting of injection tank pressure, the interference of furnace pressure fluctuation can be effectively prevented injection rate to injection tank pressure and blast furnace furnace pressure.
2 utilize apery worker intelligent rules control algolithm that tank pressure is regulated, hysteresis that occurs in the time of can preventing tank pressure regulation and fluctuation, the fast and stable evenly temper of assurance tank pressure.
3. utilize injection rate and fluidized gas flow to constitute the cascade PID control loop and regulate injection rate, realized quick, evenly temper, thereby satisfy the requirement that blast furnace is produced injection rate.
4 have increased the amplitude limit control to fluidisation variable valve and conveying gas variable valve, prevent that coal dust from stopping up.
5. technological operation is simple, can reduce the manual shift of operative employee in the production process, reduces working strength.
6. improved automatization level, avoided injection rate produced by the external interference factor affecting and fluctuate widely, for blast furnace stable smooth operation high yield and low cost creates conditions.
The present invention shows by experiment, the pulverized coal injection ratio can be brought up to more than the 180kg/t, one ton of pig iron of every production can be saved more than the coke 160kg, the error control of hour coal powder injection rate is in 0.5%, and in the production process, because extraneous factors such as furnace pressure or ature of coal change when producing disturbance, system can fast and stable, need not manual intervention, strengthened the adaptive ability of this system, guaranteed direct motion, low consumption, the high yield of blast furnace.
Description of drawings
Fig. 1 is a coal injection system of blast furnace structural representation of the present invention.
Fig. 2 is the tandem control loop schematic diagram of coal injection system of blast furnace of the present invention.
Among the figure: 1. Pulverized Coal Bin; 2. nitrogen voltage regulating station; 3. compressed air station; 4. mixing tank; 5. divider; 6. blast furnace; First the winding-up jar; Second the winding-up jar; 9. carry the gas variable valve; 10. ftercompction variable valve; 11. fluidisation variable valve; 12. diffuse trip valve for a short time; 13. diffuse trip valve greatly; 14. charging trip valve; 15. blanking trip valve; 16. ftercompction trip valve; 17. pressurising trip valve; 18. fluidisation trip valve; 19. coal injection cutting valve.
Embodiment
Provided by the invention to pulverized coal injection injection rate control method, referring to Fig. 1, winding-up pattern in parallel that employing (comprises two jars) more than two jars, adjusting for injection rate mainly is by regulating the tonifying Qi variable valve, for a short time diffuse trip valve, fluidisation variable valve and conveying gas variable valve are realized, by regulating the tonifying Qi variable valve, for a short time diffuse trip valve and stablize the winding-up tank pressure, regulate and carry the gas variable valve to stablize load volume, the adjusting of injection rate and fluidized gas flow constitutes PID tandem control loop, in order to regulate injection rate rapidly and uniformly, if can be good at handling tank pressure, the relation of load volume and fluidized gas flow ternary and injection rate, thereby required the creating conditions that so just can make injection rate be controlled effectively and produce smoothly for blast furnace.
Below in conjunction with embodiment and accompanying drawing method provided by the invention is described further.
It is generally acknowledged that there are certain functional relation in injection rate and tank pressure and load volume, and in the actual motion, we find because there is hysteresis in tank pressure regulation, and also there is fluctuation in tank pressure itself, this body structure of Dual-Phrase Distribution of Gas olid object is quite complicated, and a lot of to the factor of injection rate influence, as coal powder size, coal dust humidity, coal capacity, tank pressure leakage, load volume fluctuation, conditions of blast furnace or the like, especially the fluctuation of tank pressure fluctuation and load volume can cause the fluctuation of coal powder injection rate, even reduces to 0.Therefore, be difficult to obtain precise math model, and control poor effect with traditional pid control mode for the relation of injection rate and tank pressure and load volume.
The present invention is directed to above problem,, improve and control from following four steps according to on-the-spot practical operating experiences:
The first step is determined the differential pressure setpoint of injection tank pressure and blast furnace furnace pressure.
When utilizing PID to regulate tank pressure, tank pressure was failed the problem of response in time when the big and blast furnace furnace pressure of the set(ting)value of tank pressure fluctuation changed, to be converted into setting to the setting of tank pressure to tank pressure and furnace pressure differential pressure, and with the set(ting)value of the differential pressure step function as injection rate, the set(ting)value of tank pressure is the set(ting)value and the furnace pressure sum of differential pressure.
Differential pressure setpoint to tank pressure and furnace pressure adopts step function, and is as follows:
P = f ( v ) = P 1 v 1 < v < v 2 a 1 * v + b 1 v 2 < v < v 3 a 2 * v + b 2 v 3 < v < v 4 P 2 v 4 < v
P=ΔP+P_BF
Δ P is the differential pressure setpoint of tank pressure and furnace pressure
P_BF is the blast furnace furnace pressure
P is the injection tank pressure set(ting)value
V is the injection rate set(ting)value
P1, P2, V1, V2, V3, V4, a1, a2, b1, b2 are constant, can do suitable adjustment according to the actual process situation.
When low and higher injection rate, to adjust tank pressure and not only can not obtain the fluctuation that the ideal injection rate can cause injection rate on the contrary, this moment, tank pressure need keep stable.
When medium injection rate, it is divided into two sections, respectively corresponding two linear functions of tank pressure set(ting)value are in [v2, v3] section, the slope of linear function is slightly larger, the tank pressure set(ting)value is followed injection rate and is risen slightly hurry up, in [v3, v4] section, the slope of linear function is slightly smaller, and the tank pressure set(ting)value is followed injection rate and risen slow slightly.
In second step, injection tank pressure is regulated:
Hysteresis at tank pressure regulation, and the regulating frequency of tank pressure too much causes its this problem that fluctuates, adjusting to tank pressure, can be pressurized to the tank pressure set(ting)value to the winding-up jar by the pressurising pipeline, in the winding-up process, open the ftercompction trip valve, tank pressure is adopted apery worker intelligent rules control method, by regulating the ftercompction variable valve injection tank pressure is regulated, produced when avoiding adopting PID regulating and controlling tank pressure and lag behind and fluctuation.Rule control is to be based upon on a series of control laws, and these rules are people's summaries of experience when controlled plant is controlled, for example: if tank pressure is higher and continuous rising, should reduce the aperture of tonifying Qi variable valve so.According to process engineer's knowhow, the control law of eliminating systematic error by the error and the error variation tendency of system output.Rule is selected the form of " if E and EC then U " for use, obtains language control law storehouse, and is as shown in the table:
IF e1>=E>e2 AND 0>=EC>ec1 THEN U=u1
IF e2>=E>e3 AND 0>=EC>ec1 THEN U=u2
IF e3>=E>e4 AND 0>=EC>ec1 THEN U=u3
IF e4>=E>e5 AND 0>=EC>ec1 THEN U=u4
IF e5>=E>e6 AND 0>=EC>ec1 THEN U=u5
IF e6>=E>e7 AND 0>=EC>ec1 THEN U=u6
IF e7>=E AND 0>=EC>ec1 THEN U=u7
IF e1>=E>e2 AND ec1>=EC>ec2 THEN U=u2
IF e2>=E>e3 AND ec1>=FC>ec2 THFN U?=u2
IF e3>=E>e4 AND ec1>=EC>ec2 THEN U=u4
IF e4>=E>e5 AND ec1>=EC>ec2 THEN U=u4
IF e5>=E>e6 AND ec1>=EC>ec2 THEN U=u6
IF e6>=E>e7 AND ec1>=EC>ec2 THEN U=u6
IF e7>=E AND ec1>=EC>ec2 THEN U=u7
IF e1>=E>e2 AND ec2>=EC>ec3 THEN U=u2
IF e2>=E>e3 AND ec2>=EC>ec3 THEN U=u3
IF e3>=E>e4 AND ec2>=EC>ec3 THEN U=u4
IF e4>=E>e5 AND ec2>=EC>ec3 THEN U=u5
IF e5>=E>e6 AND ec2>=EC>ec3 THEN U=u6
IF e6>=E>e7 AND ec2>=EC>ec3 THEN U=u7
IF e7>=E AND ec2>=EC>ec3 THEN U=u7
IF e1>=E>e2 AND ec3>=EC THEN U=u3
IF e2>=E>e3 AND ec3>=EC THEN U=u3
IF e3>=E>e4 AND ec3>=EC THEN U=u5
IF e4>=E>e5 AND ec3>=EC THEN U=u5
IF e5>=E>e6 AND ec3>=EC THEN U=u7
IF e6>=E>e7 AND ec3>=EC THEN U=u7
IF e7>=E AND ec3>=EC THEN U=u7
In the above-mentioned language control law storehouse: E is tank pressure deviation (set(ting)value and an actual value poor), and EC is the velocity of variation of deviation, and U is a tonifying Qi variable valve output aperture.E1~e7, ec1~ec3, u1~u7 are constant, can do suitable adjustment according to the actual process situation.
In addition, when actual value and set(ting)value deviation during greater than a certain value, open and diffuse valve for a short time, when actual value and set(ting)value deviation surpass 10s (adjustable) less than 5kPa (adjustable) or duration of valve opening, close and diffuse valve for a short time, if after diffusing valve and close for a short time, deviation does not still satisfy condition, then interval 5s (adjustable) carries out above action once more.
By above control mode, hysteresis that occurs in the time of can preventing tank pressure regulation and fluctuation, the fast and stable evenly temper of assurance tank pressure.
The 3rd step, to the adjusting of load volume:
According to the load volume increase then injection rate reduce, load volume reduces then that injection rate increases this ultimate principle and service experience, with the set(ting)value of the load volume step function as injection rate.PID single loop control mode is also adopted in the control of load volume, because coal powder injection is a solid-gas phase, when injecting coal quantity is big, need load volume less, PID can turn down valve when regulating, when valve opening diminishes, conveying tolerance reduces, pressure in the pulverized coal channel can reduce, cause this moment coal dust to stop up easily, influence the blast furnace ordinary production, cause high blast wandering, even damping down, therefore to need valve opening is done minimum amplitude limit control by this regulating loop, cause coal dust to stop up in case carry atmospheric pressure to reduce.
1. the set(ting)value to load volume adopts step function, and is as follows:
F = f ( v ) = F 1 v 1 < v < v 2 a 1 * v + b 1 v 2 < v < v 3 F 2 v 3 < v
In the formula: F is the load volume set(ting)value.V is the injection rate set(ting)value.F1, F2, V1, V2, V3, a1 and a2 are constant, F1>F2, and suitable adjustment can be done according to the actual process situation in a1<0.
When low and higher injection rate, to adjust load volume and not only can not obtain the fluctuation that the ideal injection rate can cause injection rate on the contrary, this moment, load volume need keep stable.
When medium injection rate, the corresponding linear function of load volume set(ting)value, in [v2, v3] section, the load volume set(ting)value is followed the injection rate set(ting)value and is risen and descend.
In the 4th step, regulate injection rate with the cascade PID control mode:
In operational process, we find that injection rate is responsive especially to the variation of fluidized gas, the operative employee also is at the flow of regulating fluidized gas when adjusting injection rate, in view of the above, we are with the ordering parameter of fluidized gas flow as the injection rate temporal variation, constitute the cascade PID Controlling System, will carry out amplitude limit to the fluidisation variable valve simultaneously, prevent that fluidization gas is too small or excessive.
To the control of fluidized gas flow, its purpose mainly is that rapid adjustment is carried out in the momentary fluctuation of injection rate.The effect of fluidized gas is the coal dust of fluidisation winding-up pot bottom, needs the fluidisation coal dust that do not stop in the winding-up process, makes the uniform and stable ejection of coal dust.In the actual moving process, when injection rate is stablized, if increase the fluidized gas flow, injection rate can increase, and reduces the fluidized gas flow, and injection rate can reduce, but injection rate is excessive or too smallly all can cause injection rate excessively to reduce even be 0, cause coal dust to stop up easily, influence the blast furnace ordinary production, cause high blast wandering, even damping down.According to above situation, cascade PID control loop as shown below has been adopted in the control of fluidized gas, simultaneously control valve opening is carried out amplitude limit control, to the initial value of fluidized gas flow at first be set and in initial 3 minutes, not carry out the tandem adjusting according to initial injection rate when winding-up starts in addition, in the tonifying Qi process, the fluidized gas flow not regulated.
By above improvement, can adjust injection rate effectively, fast, uniformly, to satisfy the requirement that blast furnace is produced.
In to pulverized coal injection injection rate control process, the order of four above-mentioned steps there is no sequencing.If because the blast furnace operating mode changes, when needing to adjust the injection rate set(ting)value, four steps are carried out simultaneously in the winding-up process.If because external interference such as ature of coal causes the injection rate fluctuation, and the injection rate set(ting)value need not to change tank pressure and load volume set(ting)value when constant, as long as under the situation of stablize tank pressure and load volume, adjusting fluidized gas tandem control loop gets final product.
The core of this control method is under a certain setting injection rate, stablize tank pressure and load volume thereof, utilize the cascade PID loop by the fluidized gas flow being regulated to reach control to injection rate, this control method can be stablized injection rate, reduce the manual shift of operative employee in the production process, reduce working strength, improve automatization level, avoid injection rate produced by the external interference factor affecting and fluctuate widely, for blast furnace stable smooth operation high yield and low cost creates conditions.
The invention provides coal injection system of blast furnace, can realize the control to the pulverized coal injection injection rate, this system comprises nitrogen voltage regulating station 2, compressed air station 3, mixing tank 4, divider 5, a plurality of winding-up jar, trip valve and variable valve.
Be the structure that example illustrates described coal injection system of blast furnace with two jars of winding-up patterns in parallel below.
As shown in Figure 1, described coal injection system of blast furnace is provided with first winding-up jar 7, the second winding-up jar 8, they link to each other with Pulverized Coal Bin 1 with charging trip valve 14, blanking trip valve 15 by pipeline respectively, canned material is used to jet, simultaneously, be used for the winding-up jar and diffuse again respectively by pipeline and diffuse trip valve 12 for a short time, diffuse trip valve 13 greatly and link to each other with Pulverized Coal Bin 1.Described two winding-up jars also pass through three connecting pipe roads and valve and link to each other with nitrogen voltage regulating station 2 respectively, and wherein: a connecting pipe road is equipped with ftercompction variable valve 10 and ftercompction trip valve 16, is used for a winding-up jar ftercompction.One connecting pipe road is equipped with pressurising trip valve 17, is used for winding-up jar pressurising.One connecting pipe road is equipped with fluidisation variable valve 11 and fluidisation trip valve 18, is used for winding-up jar coal dust fluidisation.Described two winding-up jars link to each other with mixing tank 4 by pipeline and coal injection cutting valve 19 respectively again.
Described mixing tank 4, as shown in Figure 1: it is by pipeline and carry gas variable valve 9 to link to each other with compressed air station 3; This mixing tank links to each other with divider 5 through pipeline again.The effect of this mixing tank is with coal dust and carries gas to mix.
Described divider 5, as shown in Figure 1: it links to each other with each air port of blast furnace 6 through pipeline.The effect of this divider is each air port that coal dust is assigned to blast furnace respectively.
Described each trip valve, ftercompction variable valve 10, fluidisation variable valve 11 and conveying gas variable valve 9 all can be by buying on the market, for example: it is Q641F type ball valve that ftercompction trip valve 16, pressurising trip valve 17, fluidisation trip valve 18 can adopt model, diffuses trip valve 12 for a short time, diffusing trip valve 13, charging trip valve 14 and blanking trip valve 15 and coal injection cutting valve 19 greatly, can to adopt model be Q647F wear-resistant type ball valve.Carry gas variable valve 9, ftercompction variable valve 10, fluidisation variable valve 11 can adopt the air bladder single-seat adjusting valve of Wuxi frock, model is 501T.
The control principle of coal injection system of blast furnace of the present invention is as shown in Figure 2: be divided into injection rate PID tandem control loop, injection tank pressure control loop and load volume control loop.Wherein, the injection rate set(ting)value of The whole control system is manually set according to the blast furnace production status by the process engineer.
For injection rate PID tandem control loop, as main ring, be inner loop with the injection rate pid control circuit with fluidized gas flow pid control circuit, constitute the PID cascade control system.The set(ting)value of injection rate PID controller is the injection rate set(ting)value, the observed value of injection rate PID controller is the injection rate measuring and calculating value after breeze blowing rate computing module calculates, the principle of this injection rate computing module is winding-up jar coal dust weight to be carried out differential calculation obtain the injection rate observed value, injection rate PID controller output signal as the set(ting)value of fluidized gas flow PID controller, the observed value of fluidized gas flow PID controller is the feedback signal of situ flow gasification flow detecting element, the aperture that the output signal of fluidized gas flow PID controller is regulated the fluidized gas variable valve through amplitude limit control back, thereby regulate the fluidized gas flow, finally reach the effect of regulating injection rate in the winding-up process.
For the injection tank pressure control loop, the set(ting)value of its tank pressure is set the step function method according to above-mentioned tank pressure and is calculated, then by apery worker intelligent rules control algolithm to the ftercompction variable valve with diffuse trip valve for a short time and regulate, finally reach the control tank pressure of fast and stable.
For the load volume control loop, the set(ting)value of its load volume is set the step function method according to above-mentioned load volume and is calculated, adopt the single loop pid control mode to regulate then to carrying the gas variable valve, and the aperture of variable valve is carried out amplitude limit control, control load volume stably to reach, make it satisfy the needs of current setting injection rate.
By above three control loops, can realize accurate, stable, evenly control to injection rate, make whole breeze blowing production process can satisfy blast furnace and produce needs, for blast furnace stable smooth operation high yield and low cost creates conditions.
Coal injection system of blast furnace provided by the invention, its working process is: Pulverized Coal Bin 1 bottom links to each other with two winding-up jars by powder sinking tube, charging trip valve 14, blanking trip valve 15.Coal dust in the Pulverized Coal Bin 1 falls into the winding-up jar by gravity.Each winding-up jar moves alternately by dress powder, pressurising, wait, the program loop of jetting, diffuse, refill powder.When one of them jar in when winding-up, another jar diffusing, adorning powder, pressurising, wait.Wherein one jar when having jetted, another jar drops into winding-up automatically, dusts continuously to blast furnace guaranteeing.Be provided with nitrogen in the winding-up tank top and diffuse interface, winding-up will be jetted jar interior gas by diffusing trip valve 12 for a short time and diffusing trip valve 13 greatly and diffuse to Pulverized Coal Bin after finishing.Pressurising and ftercompction interface are arranged at winding-up jar top, by pressurising trip valve 17 nitrogen pressurising, open ftercompction trip valve 16 in the winding-up process, regulate by 10 pairs of tank pressures of ftercompction variable valve.Fluidizer is arranged at a winding-up jar bottom, opens fluidisation trip valve 18 in the winding-up process, by fluidisation variable valve 11 nitrogen gas stream powdered coal.The coal dust that is fluidized is outer to mixing tank 4 by the delivery line drain tank under the effect of tank pressure, mixes with carrying gas (pressurized air or nitrogen) at mixing tank 4 places, and the load volume size is controlled by 9 adjustings of conveying gas variable valve according to winding-up amount set(ting)value.Coal dust is being delivered near the divider 5 that is installed in the blast furnace under the effect of carrying gas, coal dust enters in blast furnace 6 stoves behind winding-up arm, spray gun after divider 5 evenly distribute.

Claims (7)

1. a method for controlling coal injecting rate of blast furnace is characterized in that adopting winding-up pattern in parallel more than two jars or two jars, mainly is to the tonifying Qi variable valve, diffuses trip valve, fluidisation variable valve and carry the control of gas variable valve to realize control to injection rate for a short time; By regulating the tonifying Qi variable valve, diffusing trip valve for a short time and stablize injection tank pressure, carry the gas variable valve to stablize load volume by regulating, under the situation of stablizing injection tank pressure and load volume, injection rate and fluidized gas Flow-rate adjustment constitute PID tandem control loop, in order to regulate injection rate rapidly and uniformly; In process of production, the relation according to processing requirement processing tank pressure, load volume and fluidized gas flow three and injection rate is controlled effectively injection rate, thereby is smooth required the creating conditions of producing of blast furnace.
2. method for controlling coal injecting rate of blast furnace according to claim 1 is characterized in that adopting the method that may further comprise the steps:
The first step, determine the differential pressure setpoint of injection tank pressure and blast furnace furnace pressure:
The setting of tank pressure is converted into setting to tank pressure and furnace pressure differential pressure, and with the set(ting)value of the described differential pressure step function as injection rate, the set(ting)value of tank pressure is the set(ting)value and the furnace pressure sum of differential pressure;
In second step, regulate injection tank pressure:
By the pressurising pipeline winding-up jar is pressurized to the tank pressure set(ting)value, in the winding-up process, open the ftercompction trip valve, adopt apery worker intelligent rules control method injection tank pressure to be regulated to tank pressure, produce when avoiding adopting PID regulating and controlling tank pressure and lag behind and fluctuation by regulating the ftercompction variable valve;
In the 3rd step, regulate load volume:
According to the load volume increase then injection rate reduce, load volume reduces then that injection rate increases this ultimate principle and service experience, with the set(ting)value of the load volume step function as injection rate; And adopt PID single loop control mode that load volume is controlled, at this moment, this regulating loop needs valve opening is done minimum amplitude limit control, causes coal dust to stop up in case carry atmospheric pressure to reduce;
In the 4th step, regulate injection rate with cascade PID loop control mode:
With the ordering parameter of fluidized gas flow as the injection rate temporal variation, constitute the cascade PID Controlling System, to carry out amplitude limit to the fluidisation variable valve simultaneously, prevent that fluidization gas is too small or excessive.
3. method for controlling coal injecting rate of blast furnace according to claim 2 is characterized in that in the first step, and described step function is:
P = f ( v ) = P 1 v 1 < v < v 2 a 1 * v + b 1 v 2 < v < v 3 a 2 * v + b 2 v 3 < v < v 4 P 2 v 4 < v
In the formula: P=Δ P+P_BF, Δ P is the differential pressure setpoint of tank pressure and furnace pressure, and P_BF is the blast furnace furnace pressure, and P is the injection tank pressure set(ting)value, V is the injection rate set(ting)value, and P1, P2, V1, V2, V3, V4 and a1, a2, b1 and b2 are the constant of setting according to the actual process situation.
4. method for controlling coal injecting rate of blast furnace according to claim 2 is characterized in that described apery worker intelligent rules adopts the form of " if E and EC then U ", obtains following language control law storehouse in second step:
IF e1>=E>e2 AND 0>=EC>ec1 THEN U=u1
IF e2>=E>e3 AND 0>=EC>ec1 THEN U=u2
IF e3>=E>e4 AND 0>=EC>ec1 THEN U=u3
IF e4>=E>e5 AND 0>=EC>ec1 THEN U=u4
IF e5>=E>e6 AND 0>=EC>ec1 THEN U=u5
IF e6>=E>e7 AND 0>=EC>ec1 THEN U=u6
IF e7>=E AND 0>=EC>ec1 THEN U=u7
IF e1>=E>e2 AND ec1>=EC>ec2 THEN U=u2
IF e2>=E>e3 AND ec1>=EC>ec2 THEN U=u2
IF e3>=E>e4 AND ec1>=EC>ec2 THEN U=u4
IF e4>=E>e5 AND ec1>=EC>ec2 THEN U=u4
IF e5>=E>e6 AND ec1>=EC>ec2 THEN U=u6
IF e6>=E>e7 AND ec1>=EC>ec2 THEN U=u6
IF e7>=E AND ec1>=EC>ec2 THEN U=u7
IF e1>=E>e2 AND ec2>=EC>ec3 THEN U=u2
IF e2>=E>e3 AND ec2>=EC>ec3 THEN U=u3
IF e3>=E>e4 AND ec2>=EC>ec3 THEN U=u4
IF e4>=E>e5 AND ec2>=EC>ec3 THEN U=u5
IF e5>=E>e6 AND ec2>=EC>ec3 THEN U=u6
IF e6>=E>e7 AND ec2>=EC>ec3 THEN U=u7
IF e7>=E AND ec2>=EC>ec3 THEN U=u7
IF e1>=E>e2 AND ec3>=EC THEN U=u3
IF e2>=E>e3 AND ec3>=EC THEN U=u3
IF e3>=E>e4 AND ec3>=EC THEN U=u5
IF e4>=E>e5 AND ec3>=EC THEN U=u5
IF e5>=E>e6 AND ec3>=EC THEN U=u7
IF e6>=E>e7 AND ec3>=EC THEN U=u7
IF e7>=E AND ec3>=EC THEN U=u7
In the above-mentioned language control law storehouse: E is the tank pressure deviation, and it is the poor of tank pressure set(ting)value and tank pressure actual value; EC is the velocity of variation of deviation; U is tonifying Qi variable valve output aperture; E1~e7, ec1~ec3, u1~u7 are the constant of setting according to the actual process situation;
In addition, when actual value and set(ting)value deviation during, open and diffuse valve for a short time greater than a certain value, when actual value and set(ting)value deviation surpass 10s less than 5kPa or duration of valve opening, close and diffuse valve for a short time, if after diffusing valve and closing, deviation does not still satisfy condition, and then interval 5s carries out above action once more.
5. method for controlling coal injecting rate of blast furnace according to claim 2 is characterized in that in the 3rd step, described set(ting)value with load volume as the step function of injection rate is:
F = f ( v ) = F 1 v 1 < v < v 2 a 1 * v + b 1 v 2 < v < v 3 F 2 v 3 < v
In the formula: F is the load volume set(ting)value; V is the injection rate set(ting)value; F1, F2, V1, V2, V3, a1 and a2 are the constant of setting according to the actual process situation, F1>F2, a1<0.
6. method for controlling coal injecting rate of blast furnace according to claim 2, it is characterized in that in the 4th step, the initial value of fluidized gas flow at first be set according to initial injection rate, and in initial 3 minutes, not carry out tandem and regulate, in the tonifying Qi process, the fluidized gas flow not regulated.
7. method for controlling coal injecting rate of blast furnace according to claim 2 is characterized in that the order of described four steps there is no sequencing in to pulverized coal injection injection rate control process; If because the blast furnace operating mode changes, when needing to adjust the injection rate set(ting)value, four steps are carried out simultaneously in the winding-up process; If because external interference such as ature of coal causes the injection rate fluctuation, and the injection rate set(ting)value need not to change tank pressure and load volume set(ting)value when constant, as long as under the situation of stablize tank pressure and load volume, adjusting fluidized gas tandem control loop gets final product.
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CN103320557A (en) * 2013-06-26 2013-09-25 中冶南方工程技术有限公司 Automatic circulation control method of parallel-pot blast furnace coal injection
CN103424165A (en) * 2013-06-26 2013-12-04 中冶南方工程技术有限公司 Method of measuring instantaneous pulverized coal flow in blast furnace coal injection system
CN104651557A (en) * 2015-03-16 2015-05-27 中冶赛迪工程技术股份有限公司 Method for setting coal injection rate of blast furnace
CN105368996A (en) * 2015-10-28 2016-03-02 北京金自天正智能控制股份有限公司 Automatic injection control method for blast furnace coal injection system
CN107460268A (en) * 2017-08-18 2017-12-12 北京首钢自动化信息技术有限公司 Pulverized coal injection automatic regulation system for pressure and its method

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN103320557A (en) * 2013-06-26 2013-09-25 中冶南方工程技术有限公司 Automatic circulation control method of parallel-pot blast furnace coal injection
CN103424165A (en) * 2013-06-26 2013-12-04 中冶南方工程技术有限公司 Method of measuring instantaneous pulverized coal flow in blast furnace coal injection system
CN104651557A (en) * 2015-03-16 2015-05-27 中冶赛迪工程技术股份有限公司 Method for setting coal injection rate of blast furnace
CN105368996A (en) * 2015-10-28 2016-03-02 北京金自天正智能控制股份有限公司 Automatic injection control method for blast furnace coal injection system
CN105368996B (en) * 2015-10-28 2017-09-22 北京金自天正智能控制股份有限公司 A kind of autocontrol method for bf coal injection system injection amount
CN107460268A (en) * 2017-08-18 2017-12-12 北京首钢自动化信息技术有限公司 Pulverized coal injection automatic regulation system for pressure and its method

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