CN106906322A - Coal powder injection volume automatic regulation method - Google Patents
Coal powder injection volume automatic regulation method Download PDFInfo
- Publication number
- CN106906322A CN106906322A CN201710232043.6A CN201710232043A CN106906322A CN 106906322 A CN106906322 A CN 106906322A CN 201710232043 A CN201710232043 A CN 201710232043A CN 106906322 A CN106906322 A CN 106906322A
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- CN
- China
- Prior art keywords
- coal powder
- powder injection
- tank
- injection rate
- coal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/04—Modeling of the process, e.g. for control purposes; CII
Abstract
A kind of coal powder injection volume automatic regulation method is proposed the invention provides the present invention, the coal powder injection volume automatic regulation method is comprised the following steps：Step A：According to operating mode, the coal powder injection rate and the tank pressure for being blown tank of setting injection tank；Step B：Under the tank pressure of setting, the actual coal powder injection rate stabilization of injection tank is made in range of set value by adjusting the coal powder injection rate of flow of air supply regulation blowing tank.The present invention can overcome that coal powder injection process artificial disturbance factor is big, injecting coal quantity fluctuation is big and the uneven problem of injection process, and high precision, cost reduction.
Description
Technical field
The present invention relates to blast fumance field, and in particular to a kind of coal powder injection volume automatic regulation method, especially without peace
On the premise of dress coal powder injection house steward regulating valve and coal powder density meter, the injecting coal quantity regulation of blast furnace is carried out.
Background technology
Coal powder injection is one of bottom adjustment means of blast furnace, and the coal powder injection of stable and uniform can promote blast furnace steady production, reduce burnt
Than and optimizing index.
Current bf coal injection system has realized the automation of process control by DCS/PLC control systems substantially, in value
Class room can monitor in real time be blown the Parameters variation of process, and carry out manual (or semi-automatic) as needed to equipment such as valve sites
Centralized operation is carried out, to realize the control to real-time injecting coal quantity.But, current control method fails to realize automatically, in spray
Blow over journey and still need substantial amounts of manual intervention, and there are problems that breeze blowing process is uneven, injecting coal quantity error.
The coal injection system of part iron enterprise by coal powder injection house steward increase regulating valve and coal powder density meter, realize it is complete from
Dynamic control, but input cost is high, and because coal powder density meter accuracy of detection is not high or demarcates the defects such as the frequency is high, easily cause spray
The problems such as coal amount error causes blast fumance unstable greatly.
In sum, there is problems with the prior art：It is being fitted without coal powder injection house steward regulating valve and coal powder density meter
On the premise of, it is impossible to realize the automatic effective regulation of injecting coal quantity.
The content of the invention
The present invention provides a kind of coal powder injection volume automatic regulation method, to solve be fitted without coal powder injection house steward regulating valve and coal dust
On the premise of densimeter, it is impossible to realize the problem of the automatic effective regulation of injecting coal quantity.
Therefore, the present invention proposes a kind of coal powder injection volume automatic regulation method, the coal powder injection volume automatic regulation method includes following
Step：
Step A：According to operating mode, the coal powder injection rate and the tank pressure for being blown tank of setting injection tank；
Step B：Under the tank pressure of setting, the actual spray of injection tank is made by adjusting the coal powder injection rate of flow of air supply regulation blowing tank
Coal rate stabilization is in range of set value.
Further, the tank pressure of the injection tank is set according to the coal powder injection rate of injection tank, and the injection tank
Tank pressure sets as follows with the relation of the coal powder injection rate of injection tank：
Wherein P：Tank pressure setting value, unit kPa；
VIf：The coal powder injection rate of setting, unit t/h；
X：Correction factor, works as VIf"+" is taken during-V ＜ 0；VIf"-" is taken during-V >=0.
Further, in the step A, according to the coal powder injection rate of injecting coal quantity setting injection tank.
Further, the setting value for coal powder injection rate of adjustment in every 10 minutes.
Further, according to injecting coal quantity and the deviation of setting injecting coal quantity, set in next ten minutes adjustment coal powder injection rates
Value is compensated.
Further, the regulation of coal powder injection rate is adjusted by tonifying Qi regulating valve.
Further, the regulation of coal powder injection rate is further：Closed loop regulation is carried out by tonifying Qi regulating valve, tonifying Qi regulating valve
Aperture is limited in the aperture of 20%-45%.
Further, it is adjusted using PID control method according to the deviation between actual coal powder injection rate and setting coal powder injection rate, it is real
When coal powder injection rate in border is bigger than setting coal powder injection rate, tonifying Qi regulating valve should be turned down；Actual coal powder injection rate will should be mended than setting coal powder injection rate hour
Gas regulating valve is opened greatly.
Further, at the injection initial stage of injection tank, tonifying Qi regulating valve immobilizes according to 30% aperture, treats that coal powder injection rate is steady
Determine or put into again later for 2 minutes to automatically adjust.
Further, the tank pressure of injection tank is automatically adjusted in setting value model by automatically adjusting ftercompction regulating valve and relief valve
In enclosing.
The present invention is by under the tank pressure of setting, the reality of injection tank being made by adjusting the coal powder injection rate of flow of air supply regulation blowing tank
Border coal powder injection rate stabilization, that is, using the control principle of " determine tank pressure and adjust flow of air supply ", meets the steady of injecting coal quantity in range of set value
It is qualitative, realize injecting coal quantity full-automatic regulation, coal powder injection rate fluctuation ＜ 2t/h, hour injecting coal quantity error about 0.3%, is steady production
There is provided condition.
The present invention does not need the coal powder injection house steward to increase regulating valve and coal powder density meter, reduces cost, and avoid and because
Coal powder density meter accuracy of detection is not high or demarcate the defects such as the frequency is high, it is to avoid easily cause injecting coal quantity error big and cause blast furnace
The problems such as producing unstable.
Brief description of the drawings
Fig. 1 is the control principle schematic diagram of coal powder injection volume automatic regulation method of the invention.(in figureRepresent comparator)
Specific embodiment
In order to be more clearly understood to technical characteristic of the invention, purpose and effect, now control illustrates this hair
It is bright.
The present invention proposes a kind of coal powder injection volume automatic regulation method, and the coal powder injection volume automatic regulation method is comprised the following steps：
Step A：According to operating mode, the coal powder injection rate and the tank pressure for being blown tank of setting injection tank；
Step B：Under the tank pressure of setting, the actual spray of injection tank is made by adjusting the coal powder injection rate of flow of air supply regulation blowing tank
Coal rate stabilization is in range of set value.
During coal powder injection, there is pressure in State of Blast Furnace, coal powder injection tank is also long to blast furnace distance, and the tank pressure for being blown tank must
Blast furnace furnace pressure must be more than, can be sent in State of Blast Furnace.The tank pressure of injection tank was adjusted by fixed flow of air supply in the past, although
Coal powder injection rate can be adjusted, but the regulating effect of coal powder injection rate and injecting coal quantity is bad；The present invention changes Normal practice, by setting
Tank pressure under, by adjust the coal powder injection rate of flow of air supply regulation blowing tank make injection tank actual coal powder injection rate stabilization in setting value model
Enclose, i.e., using the control principle of " determine tank pressure and adjust flow of air supply ", meet the stability of injecting coal quantity, realize injecting coal quantity full-automatic
Regulation.
Further, the tank pressure of the injection tank is set according to the coal powder injection rate of injection tank, and the injection tank
Tank pressure sets as follows with the relation of the coal powder injection rate of injection tank：
Wherein P：Tank pressure setting value, unit kPa；
VIf：The coal powder injection rate of setting, unit t/h；
X：Correction factor, works as VIf"+" is taken during-V ＜ 0；VIf"-" is taken during-V >=0.
When actual coal powder injection rate is more than 2 tons with setting coal powder injection rate deviation, then by tank pressure setting increase and decrease 20kPa；When actual coal powder injection
Rate is more than 4 tons with setting coal powder injection rate deviation, then by tank pressure setting increase and decrease 30kPa.
Above-mentioned formula is the empirical equation for getting by repetitious fitting, recurrence.Inventor obtains by test of many times
To operating experience, it is found that control of the tank pressure to coal powder injection rate is coarse adjustment, control of the flow of air supply to coal powder injection rate is fine setting, when coal powder injection rate
It is in fact the adjustable range beyond flow of air supply when fluctuating big, it is necessary to which appropriate adjustment tank pressure is stable to realize coal powder injection rate.
The formula is that the tank pressure for being blown tank has carried out quantitative determination with the relation of the coal powder injection rate of injection tank, is obtained so that in the tank pressure of setting
Under, make the actual coal powder injection rate stabilization of injection tank in range of set value by adjusting the coal powder injection rate of flow of air supply regulation blowing tank.The public affairs
The basis of formula setting is actual coal powder injection rate and setting coal powder injection rate deviation, according to actual coal powder injection rate and the deviation for setting coal powder injection rate, if
Surely it is blown the tank pressure of tank.And then, using correction factor, further correction refinement is blown the tank pressure of tank so that coal powder injection rate is at one
Under the tank pressure of the injection tank of the association of stabilization, the stability of injecting coal quantity is disclosure satisfy that, realize injecting coal quantity full-automatic regulation, coal powder injection
Rate fluctuation ＜ 2t/h, hour injecting coal quantity error about 0.3%, for steady production provides condition.
Further, as shown in figure 1, in the step A, the coal powder injection rate of tank is blown according to injecting coal quantity setting, by injecting coal quantity
The setting of coal powder injection rate is extrapolated in setting, to ensure the target that injecting coal quantity is controlled.
Further, the setting value for coal powder injection rate of adjustment in every 10 minutes, to cause half an hour injecting coal quantity and hour coal powder injection
Amount meets blast furnace requirement.
Further, according to injecting coal quantity and the deviation of setting injecting coal quantity, set in next ten minutes adjustment coal powder injection rates
Value is compensated.According to injecting coal quantity and the deviation of setting injecting coal quantity, carried out in next ten minutes adjustment coal powder injection rate setting values
Compensation, ensures that the stability of half an hour injecting coal quantity and hour injecting coal quantity.
Further, as shown in figure 1, the regulation of coal powder injection rate is adjusted by tonifying Qi regulating valve.It is, determining tank pressure tune
Flow of air supply is adjusted by tonifying Qi regulating valve, so, reliability easy to adjust, it is to avoid coal powder injection house steward increases regulating valve and coal
The problem that powder densimeter cost is improved.
Further, the regulation of coal powder injection rate is further：Closed loop regulation is carried out by tonifying Qi regulating valve, tonifying Qi regulating valve
Aperture is limited in the aperture of 20%-45%.Inventor has found：Because the aperture of tonifying Qi regulating valve influences very big on coal powder injection rate, and
And there is hysteresis quality during regulation, by repetition test, it is defined as：The aperture of tonifying Qi regulating valve is limited in opening for 20%-45%
Degree, does not allow the amplitude of accommodation excessive, to ensure the stability of adjustment.
Further, as shown in figure 1, using PID control method according to the deviation between actual coal powder injection rate and setting coal powder injection rate
It is adjusted, when actual coal powder injection rate is bigger than setting coal powder injection rate, tonifying Qi regulating valve should be turned down；Actual coal powder injection rate is than setting coal powder injection rate
Hour, tonifying Qi regulating valve should be opened greatly.Carried out using PID control method according to the deviation between actual coal powder injection rate and setting coal powder injection rate
Regulation, makes actual coal powder injection rate stabilization in range of set value, realizes uniform coal powder injection.In the pid control parameter of setting tonifying Qi regulating valve
When, it is necessary to select reaction.
Further, at the injection initial stage of injection tank, tonifying Qi regulating valve immobilizes according to 30% aperture, treats that coal powder injection rate is steady
Determine or put into again later for 2 minutes to automatically adjust.This allows for the big factor of new tank injection initial stage injecting coal quantity fluctuation.So, it is right
In the mode once of compensation in every ten minutes, the present invention can accomplish accurately to divide different phase, and overall adjustment is can guarantee that again is
System property and stability.
Further, as shown in figure 1, by PID control method, automatically adjusting ftercompction regulating valve and relief valve being automatically adjusted
The tank pressure of tank is blown in range of set value, simple to operate, cost is relatively low.
Introduce overall work principle of the invention and process again below：
As shown in figure 1, the present invention extrapolates coal powder injection rate by injecting coal quantity setting set, according to the different set of coal powder injection rate, spray
Empirically curve is set to blow tank tank pressure setting value, and automatically adjusts tank by automatically adjusting ftercompction regulating valve and relief valve
It is pressed in range of set value.Blowing tank pressure regulation does not control coal powder injection rate directly, but is influenceed by coal powder injection rate deviation, tank pressure
Setting experience is as follows：
Wherein P- tank pressures setting value, unit kPa；
V sets-sets coal powder injection rate, unit t/h；
X- correction factors, "+" is taken when V sets-V ＜ 0；V takes "-" when setting-V >=0.
When actual coal powder injection rate is more than 2 tons with setting coal powder injection rate deviation, then by tank pressure setting increase and decrease 20kPa；When actual coal powder injection
Rate is more than 4 tons with setting coal powder injection rate deviation, then by tank pressure setting increase and decrease 30kPa.
The regulation of coal powder injection rate then carries out closed loop regulation by tonifying Qi regulating valve, according between actual coal powder injection rate and setting coal powder injection rate
Deviation be adjusted using PID control method, make actual coal powder injection rate stabilization in range of set value, realize uniform coal powder injection.Due to
The aperture of tonifying Qi regulating valve influences very big on coal powder injection rate, and there is hysteresis quality during regulation, by repetition test, tonifying Qi is adjusted
The aperture of valve is limited in the aperture of 20%-45%, does not allow the amplitude of accommodation excessive.While it is noted that, actual coal powder injection rate
When bigger than setting coal powder injection, tonifying Qi regulating valve should be turned down；Actual coal powder injection rate should open tonifying Qi regulating valve than setting coal powder injection rate hour
Greatly, so when the pid control parameter of tonifying Qi regulating valve is set, it is necessary to select reaction.
Because the injecting coal quantity fluctuation of new tank injection initial stage is big, tonifying Qi regulating valve immobilizes according to 30% aperture, treats coal powder injection rate
Stabilization puts into automatic for 2 minutes again later.
As shown in figure 1, meeting blast furnace requirement to meet half an hour injecting coal quantity and hour injecting coal quantity, it is necessary in injection process
In real-Time Compensation is set for injecting coal quantity, in figureRepresent comparator.This secondary design is employed every ten minutes and compensated once
Method, after being blown ten minutes, according to injecting coal quantity and the deviation of setting injecting coal quantity, set in next ten minutes adjustment coal powder injection rates
Value is compensated, and ensures that the stability of half an hour injecting coal quantity and hour injecting coal quantity.
The present invention realizes injecting coal quantity full-automatic regulation, coal powder injection rate fluctuation ＜ 2t/h, hour injecting coal quantity error about 0.3%,
For steady production provides condition.The present invention can overcome that coal powder injection process artificial disturbance factor is big, injecting coal quantity fluctuation is big and injection
The uneven problem of process, and high precision, cost reduction.
Schematical specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.For this
Each part of invention can be mutually combined under conditions of not conflicting, any those skilled in the art, not depart from this
Done equivalent variations and modification, all should belong to the scope of protection of the invention on the premise of the design of invention and principle.
Claims (10)
1. a kind of coal powder injection volume automatic regulation method, it is characterised in that the coal powder injection volume automatic regulation method is comprised the following steps：
Step A：According to operating mode, the coal powder injection rate and the tank pressure for being blown tank of setting injection tank；
Step B：Under the tank pressure of setting, the actual coal powder injection rate of injection tank is made by adjusting the coal powder injection rate of flow of air supply regulation blowing tank
Stabilization is in range of set value.
2. coal powder injection volume automatic regulation method as claimed in claim 1, it is characterised in that the tank pressure of the injection tank is according to injection
The coal powder injection rate of tank is set, and the tank pressure of the injection tank sets as follows with the relation of the coal powder injection rate of injection tank：
Wherein P：Tank pressure setting value, unit kPa；
VIf：The coal powder injection rate of setting, unit t/h；
X：Correction factor, works as VIf"+" is taken during-V ＜ 0；VIf"-" is taken during-V >=0.
3. coal powder injection volume automatic regulation method as claimed in claim 1, it is characterised in that in the step A, set according to injecting coal quantity
Surely it is blown the coal powder injection rate of tank.
4. coal powder injection volume automatic regulation method as claimed in claim 1, it is characterised in that the coal powder injection rate of adjustment in every 10 minutes
Setting value.
5. coal powder injection volume automatic regulation method as claimed in claim 4, it is characterised in that according to injecting coal quantity and setting injecting coal quantity
Deviation, next ten minutes adjustment coal powder injection rate setting value compensate.
6. coal powder injection volume automatic regulation method as claimed in claim 1, it is characterised in that the regulation of coal powder injection rate is adjusted by tonifying Qi
Valve is adjusted.
7. coal powder injection volume automatic regulation method as claimed in claim 6, it is characterised in that the regulation of coal powder injection rate is further：It is logical
Crossing tonifying Qi regulating valve carries out closed loop regulation, and the aperture of tonifying Qi regulating valve is limited in the aperture of 20%-45%.
8. coal powder injection volume automatic regulation method as claimed in claim 6, it is characterised in that according to actual coal powder injection rate and setting coal powder injection
Deviation between rate is adjusted using PID control method, when actual coal powder injection rate is bigger than setting coal powder injection rate, should be closed tonifying Qi regulating valve
It is small；Actual coal powder injection rate should open greatly tonifying Qi regulating valve than setting coal powder injection rate hour.
9. coal powder injection volume automatic regulation method as claimed in claim 6, it is characterised in that at the injection initial stage of injection tank, tonifying Qi
Regulating valve immobilizes according to 30% aperture, after coal powder injection rate stabilization or 2 minutes later put into again and automatically adjust.
10. coal powder injection volume automatic regulation method as claimed in claim 1, it is characterised in that by automatically adjusting ftercompction regulating valve
With relief valve automatically adjust injection tank tank pressure in range of set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232043.6A CN106906322A (en) | 2017-04-11 | 2017-04-11 | Coal powder injection volume automatic regulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232043.6A CN106906322A (en) | 2017-04-11 | 2017-04-11 | Coal powder injection volume automatic regulation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106906322A true CN106906322A (en) | 2017-06-30 |
Family
ID=59194990
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710232043.6A Withdrawn CN106906322A (en) | 2017-04-11 | 2017-04-11 | Coal powder injection volume automatic regulation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000309812A (en) * | 1999-04-22 | 2000-11-07 | Nkk Corp | Method for controlling pulverized fine coal level in coal bin in pulverized fine coal blowing equipment in blast furnace |
| KR20030053361A (en) * | 2001-12-22 | 2003-06-28 | 주식회사 포스코 | Pulverized coal injecting method at a stabilized rate in 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 |
-
2017
- 2017-04-11 CN CN201710232043.6A patent/CN106906322A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000309812A (en) * | 1999-04-22 | 2000-11-07 | Nkk Corp | Method for controlling pulverized fine coal level in coal bin in pulverized fine coal blowing equipment in blast furnace |
| KR20030053361A (en) * | 2001-12-22 | 2003-06-28 | 주식회사 포스코 | Pulverized coal injecting method at a stabilized rate in 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 |
Non-Patent Citations (1)
| Title |
|---|
| 李明亮 等: "高炉自动喷煤控制方案设计与实现", 《柳钢科技》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170630 |
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