CN106906323A - Blast-furnace coal powder injection process fluidizes control method - Google Patents

Blast-furnace coal powder injection process fluidizes control method Download PDF

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Publication number
CN106906323A
CN106906323A CN201710232045.5A CN201710232045A CN106906323A CN 106906323 A CN106906323 A CN 106906323A CN 201710232045 A CN201710232045 A CN 201710232045A CN 106906323 A CN106906323 A CN 106906323A
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CN
China
Prior art keywords
injection
tank
injection tank
control
fluidizes
Prior art date
Application number
CN201710232045.5A
Other languages
Chinese (zh)
Inventor
邹优虎
覃江能
邓顺
唐志宏
李明亮
颜霄飞
谢庆生
莫朝兴
祝和利
张洪波
黄金堂
Original Assignee
柳州钢铁股份有限公司
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Application filed by 柳州钢铁股份有限公司 filed Critical 柳州钢铁股份有限公司
Priority to CN201710232045.5A priority Critical patent/CN106906323A/en
Publication of CN106906323A publication Critical patent/CN106906323A/en

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/001Injecting additional fuel or reducing agents
    • C21B5/003Injection of pulverulent coal
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/006Automatically controlling the process
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B2300/00Process aspects
    • C21B2300/04Modeling of the process, e.g. for control purposes; CII

Abstract

The invention provides a kind of blast-furnace coal powder injection process fluidisation control method, the control method includes:Adjustment is distinguished in the regulation of injection tank middle part fluidization flux according to the difference of injection period;At the injection initial stage, in more than A1, injection tank middle part fluidization flux setting value is a1 to coal dust weight in the injection tank;In the injection middle and later periods, when coal dust weight is less than D1 in the injection tank, injection tank middle part fluidization flux setting value is d1;Between injection initial stage and injection middle and later periods, coal dust weight is more than or equal to D1 in the injection tank, and during less than A1, injection tank middle part fluidization flux setting value is b1;Wherein, the unit of A1, D1 is ton, the unit Nm of a1, b1, d13/ h, a1 and d1 are unequal.The invention enables coal powder injection rate stabilization, fluctuation is 2t/h to the maximum, average fluctuation about 1t/h, hour injecting coal quantity mean error about 0.3%.

Description

Blast-furnace coal powder injection process fluidizes control method
Technical field
The present invention relates to blast-furnace coal powder injection field, and in particular to be provided with bottom fluidizer and middle part stream in injection tank The injection system that makeup is put adjusts the control method of powder fluidized, i.e., a kind of blast-furnace coal powder injection process fluidisation control method.
Background technology
During blast-furnace coal powder injection, injection tank in powder fluidized effect quality will influence coal powder injection process complexity and The uniformity of coal powder injection.Powder fluidized influential effect factor is more, and control difficulty is big, and fluidizes regulation at present mostly using regulation manually Mode, fluidisation Valve controlling is not to be automatically adjusted with working conditions change, is often simply produced coal difficulty in injection tank When just suitably adjusted, and operating process is without fixed mode, and different people's operations is also different, when producing coal unimpeded, Coal powder density is low, and air consumption is big, does not reach the requirement of high-density coal injection;When producing coal not smooth, injection process coal dust is uneven, when serious Even cause coal powder injection blockage, the continuous production of influence.
In sum, there is problems with the prior art:Using regulation powder fluidized process manually, spray process fluidisation control The not good influence caused to coal powder injection effect of system, it is impossible to adapt to coal powder injection production.
The content of the invention
The present invention provides a kind of blast-furnace coal powder injection process fluidisation control method, to solve using regulation powder fluidized manually Process, the spray process fluidisation not good influence caused to coal powder injection effect of control, it is impossible to adapt to the problem of coal powder injection production.
Therefore, the present invention proposes a kind of blast-furnace coal powder injection process fluidisation control method, the blast-furnace coal powder injection process Fluidisation control method includes:Middle part fluidizer is installed in injection tank, by the middle part fluidizer to injection tank middle part Fluidization flux is adjusted;
The middle part fluidizer includes that middle part fluidizes regulating valve, and regulating valve is fluidized to spray by automatically adjusting the middle part Blow tank middle part fluidization flux to be adjusted, the regulation of injection tank middle part fluidization flux is distinguished and adjusted according to the difference of injection period Whole, the injection period is divided into 3 stages, is respectively blown initial stage, injection middle and later periods and positioned at injection initial stage and injection middle and later periods Between injection mid-early stage;
At the injection initial stage, in more than A1, injection tank middle part fluidization flux setting value is coal dust weight in the injection tank a1;
In the injection middle and later periods, when coal dust weight is less than D1 in the injection tank, injection tank middle part fluidization flux setting value is d1;
Between injection initial stage and injection middle and later periods, coal dust weight is more than or equal to D1 in the injection tank, during less than A1, spray It is b1 to blow tank middle part fluidization flux setting value;
Wherein, the unit of A1, D1 is ton, the unit Nm of a1, b1, d13/ h, a1 and d1 are unequal.
Further, A1 is the first fixed value.
Further, D1 is the second fixed value.
Further, a1 is the 3rd fixed value, and d1 is the 4th fixed value, and a1 is more than d1.
Further, in identical time interval, the rate of change of b1 is the 5th fixed value.
Further, injection tank middle part fluidization flux it is specific set formula as:
Wherein, QIn--- injection tank middle part fluidization flux setting value, unit Nm3/h;
W --- coal dust weight, unit t in injection tank.
Further, the blast-furnace coal powder injection process fluidisation control method also includes:Bottom stream is installed in injection tank Makeup is put, and injection tank bottom fluidization flux is adjusted by the bottom fluidizer;
The bottom fluidizer includes that bottom fluidizes regulating valve, and regulating valve is fluidized to spray by automatically adjusting the bottom Blow tank bottom fluidization flux to be adjusted, the regulation of injection tank bottom fluidization flux is divided into three-stage segmentation difference adjustment.
Further, injection tank bottom fluidization flux it is specific set formula as:
Wherein, QUnder--- the fluidization flux setting of injection tank bottom, unit Nm3/h;
W --- coal dust weight, unit t in injection tank.
Inventor has found under study for action:Existing control mode does not have Reasonable Mode in the selection on control opportunity, fluidizes valve Gate control is not to be automatically adjusted with working conditions change, is often simply just fitted when injection tank produces coal difficulty Work as regulation, when producing coal unimpeded, general uncomfortable rectification valve, thus coal powder density is low, air consumption is big, does not reach high-density coal injection Requirement;Even if being adjusted when producing coal not smooth, also not quantitative Adjusted Option, the experience hobby according to operator itself It is adjusted, it is difficult to according to the Parameters variation of injection process, real-time regulation fluidisation control valve opening, it is difficult to ensure the uniform of coal powder injection Property and stability.
In order to overcome injection process to fluidize the not good influence caused to coal powder injection effect of control, the invention provides above-mentioned injection Process fluidizes control method, and it can automatically adjust, in real time according to the Parameters variation of injection process with working conditions change Regulation fluidisation control valve opening, to improve the uniformity and stability of coal powder injection.
As a example by being blown the fluidization flux regulation of tank middle part, the present invention is divided into 3 stages according to working conditions change by the period is blown, Respectively it is blown initial stage, injection middle and later periods and the injection mid-early stage between injection initial stage and injection middle and later periods, inventor By analysis and summary to mass data, it is blown when filling puffing is full, that is, is blown the initial stage, coal difficulty goes out, so the injection initial stage sets Surely injection tank middle part fluidization flux setting value is a1, with the reduction of coal dust weight in tank, difficulty of producing coal reduction, therefore progressively adjust Small middle part fluidization flux is b1;The injection middle and later periods, easily produce coal, then middle part fluidisation is turned down to d1.
Further, on the basis of the analysis to mass data and summarizing, and the plan recurrence mode is taken to carry out model and set Fixed, inventor gives formula to the specific injection tank middle part fluidization flux setting value for being blown the period, so that how quantitatively to adjust Whole injection tank middle part fluidization flux determines guidance program.
Similarly, aforesaid way is also taken in injection tank bottom fluidisation control, thus for how quantitative adjusting injection tank bottom is flowed Change flow and guidance program is determined.
According to the present invention, during automatic coal powder injection, coal powder injection rate stabilization, fluctuation is 2t/h to the maximum, average fluctuation about 1t/h, Hour injecting coal quantity mean error about 0.3%.
Brief description of the drawings
Fig. 1 is the operation principle schematic diagram that blast-furnace coal powder injection process of the invention fluidizes control method;
Fig. 2 is the control process schematic diagram that blast-furnace coal powder injection process of the invention fluidizes control method.
Drawing reference numeral explanation:
The nitrogen pot of 10 40 DCS control systems of injection tank 20 weighing sensor terminal box, 30 weighing controller 50
The weighing sensor of 81 weighing sensor, 82 weighing sensor 83
501 middle part fluidisation pipeline 503 bottom fluidisation pipelines 509 produce coal valve
The bottom fluidisation of 5010 middle part fluidisation control valve 5030 bottom fluidisation control valve, 5012 middle part fluidization flux meter 5032 Flowmeter
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.
As shown in figure 1, the present invention proposes a kind of blast-furnace coal powder injection process fluidisation control method, the blast-furnace coal powder injection Process fluidisation control method includes:Middle part fluidizer is installed in injection tank, by the middle part fluidizer to injection tank Middle part fluidization flux is adjusted;
The middle part fluidizer includes that middle part fluidizes regulating valve, and the fluidization flux regulation of injection tank middle part uses PID modes Automatically adjust, injection tank middle part fluidization flux is adjusted by automatically adjusting the middle part fluidisation regulating valve, in injection tank Adjustment is distinguished in the regulation of portion's fluidization flux according to the difference of injection period, and the injection period is divided into 3 stages, is respectively blown just Phase, injection middle and later periods and the injection mid-early stage between injection initial stage and injection middle and later periods;
Coal dust weight is blown tank middle part fluidization flux setting value in more than A1 within injection initial stage, i.e., described injection tank It is a1;
When coal dust weight is less than D1 within injection middle and later periods, i.e., described injection tank, injection tank middle part fluidization flux setting value It is d1;
Between injection initial stage and injection middle and later periods, i.e., coal dust weight is more than or equal to D1 in described injection tank, during less than A1, Injection tank middle part fluidization flux setting value is b1;
Wherein, the unit of A1, D1 is ton, the unit Nm of a1, b1, d13/ h, a1 and d1 are unequal.
The present invention according to working conditions change by be blown the period be divided into 3 stages, respectively be blown the initial stage, injection the middle and later periods, with And positioned at injection the initial stage and injection the middle and later periods between injection mid-early stage, inventor by the analysis and summary to mass data, It is blown when filling puffing is full, that is, is blown the initial stage, coal difficulty goes out, so injection initial setting injection tank middle part fluidization flux setting value is A1, with the reduction of coal dust weight in tank, difficulty of producing coal reduction, therefore it is b1 progressively to turn middle part fluidization flux down;After in injection Phase, easily produce coal, then middle part fluidisation is turned down to d1.
Further, A1 is the first fixed value, and so, one is consistent with the actual condition at injection initial stage, and two is injection The time at initial stage is relatively short, is blown 50 cubic metres of tank volume, after filling coal, coal dust weight between 30 to 33 tons, using fixed Value, can simplify the fluidisation control in the stage.
Further, D1 is the second fixed value.So, the weight according to coal dust determines operating mode or injection period, is subregion Between or gradation study find diacritical point or differentiation parameter.
Further, a1 is the 3rd fixed value, and d1 is the 4th fixed value, is blown when filling puffing is full, and coal difficulty goes out, in injection In the later stage, easily produce coal, thus setting a1 is more than d1.
Further, in identical time interval, the rate of change of b1 is the 5th fixed value.
Further, Fig. 2 shows that blast-furnace coal powder injection process of the invention fluidizes the control process of control method, its In, ordinate is fluidization flux setting value Q in the middle part of injection tankInOr injection tank bottom fluidization flux setting value QUnder, unit is Nm3/h;Abscissa is coal dust weight W, unit t (ton) in injection tank;Solid line represents injection tank bottom fluidization flux setting value QUnder, Dotted line represents fluidization flux setting value Q in the middle part of injection tankIn
As shown in Fig. 2 injection tank middle part fluidization flux it is specific set formula as:
Wherein, QIn--- injection tank middle part fluidization flux setting value, unit Nm3/h;
W --- coal dust weight, unit t in injection tank.
The formula is for how quantitative adjusting injection tank middle part fluidization flux determines guidance program.By to experiential operating work Operating process be analyzed, collect it is a large amount of be blown effect it is preferable when peration datas, by modes such as regression fits, conclude Out QInWith the linear relationship of W.
Further, as shown in figure 1, blast-furnace coal powder injection process fluidisation control method also includes:In injection tank peace Equipped with bottom fluidizer, injection tank bottom fluidization flux is adjusted by the bottom fluidizer;
The bottom fluidizer includes that bottom fluidizes regulating valve, and regulating valve is fluidized to spray by automatically adjusting the bottom Blow tank bottom fluidization flux to be adjusted, injection tank bottom (bottom) fluidization flux regulation is also adopted by PID modes and automatically adjusts, such as Shown in Fig. 2, the regulation of injection tank bottom fluidization flux is divided into three-stage segmentation difference adjustment.In such manner, it is possible to according to injection process Parameters variation, injection tank bottom fluidization flux is adjusted with working conditions change, be that adjustment injection tank bottom fluidization flux determines Guidance program.
Further, injection tank bottom fluidization flux it is specific set formula as:
Wherein, QUnder--- injection tank bottom fluidization flux setting value, unit Nm3/h;
W --- coal dust weight, unit t in injection tank.
As shown in Fig. 2 in the formula, (the injection tank in the setting of the fluidization flux of the injection mid-early stage of injection tank bottom The injection period of bottom can also be divided into:Injection initial stage, injection middle and later periods and injection mid-early stage, simply it is blown tank bottom The injection period is sometimes synchronous, sometimes asynchronous, the two incomplete coincidence with the injection period in the middle part of injection tank), use Coefficient 2.5 and the rate of change of the regulation b1 that blows mid-early stage of injection tank middle part fluidization flux be identical, so, one is bottom Similar with middle part situation, two are easy for calculating control, and the difference of other specification is then to have carried out area according to the special circumstances of bottom Other analytic induction, the formula is for how quantitative adjusting injection tank bottom fluidization flux determines guidance program.
In the present invention, as shown in Fig. 2 the fluidisation control of injection tank middle part can simultaneously enter with the fluidisation control of injection tank bottom OK, injection tank middle part fluidisation control can be sometimes synchronous on the injection period with the fluidisation control of injection tank bottom, sometimes Asynchronous.Inventor be not confined to the fluidisation control of injection tank middle part and injection tank bottom fluidisation simply and control be it is synchronous, Inventor is always according to the fluidisation control of injection tank middle part and the different situations for being blown the fluidisation control of tank bottom, it is determined that injection tank middle part Fluidisation control (determines injection tank middle part respectively with each self-adjusting abscissa and ordinate of the fluidisation control of injection tank bottom Fluidisation control fluidizes the weight adjustment point and fluidization flux setting value of control with injection tank bottom), thus, it is possible to flexibly carry out The overall fluidisation adjustment of injection tank, improves the accuracy of adjustment.According to the present invention, during automatic coal powder injection, coal powder injection rate is steady Fixed, fluctuation is 2t/h to the maximum, average fluctuation about 1t/h, hour injecting coal quantity mean error about 0.3%.
As shown in figure 1, specific adjustment means of the invention are as follows:
Injection tank 10 is provided with the valve 509 that produces coal carries out coal powder injection.Middle part fluidizer is installed at the middle part of injection tank 10, is passed through The middle part fluidizer is adjusted to injection tank middle part fluidization flux;
The middle part fluidizer includes that middle part fluidizes the middle part of pipeline 501 and the control middle part fluidisation break-make of pipeline 501 Fluidisation regulating valve 5010, middle part fluidisation regulating valve 5010 is, for example, magnetic valve, and regulating valve is fluidized by automatically adjusting the middle part Injection tank middle part fluidization flux is adjusted;
Bottom fluidizer is installed in injection tank 20 bottom, injection tank bottom is fluidized by the bottom fluidizer Flow is adjusted;
The bottom fluidizer includes that bottom fluidizes pipeline 503 and control bottom fluidizes the bottom of the break-make of pipeline 503 Fluidisation regulating valve 5030, bottom fluidisation regulating valve 5030 is, for example, magnetic valve, and regulating valve is fluidized by automatically adjusting the bottom Injection tank bottom fluidization flux is adjusted;
Middle part fluidizer and bottom fluidizer can be using existing various ripe fluidizers;
Middle part fluidizes regulating valve 5010 and bottom fluidisation regulating valve 5030, and middle part fluidisation pipeline 501 and bottom fluidisation Pipeline 503, is connected between nitrogen pot 50 and injection tank 10, and nitrogen pot 50 provides gas or pressure to be blown the fluidisation of tank 10. 3 weighing sensors, respectively weighing sensor 81, weighing sensor 82, weighing sensor 83 can be set on injection tank 10 To obtain the real-time weight signal weighing sensor 81 of coal dust in injection tank 10, weighing sensor 82, weighing sensor 83 is in parallel It is linked into weighing sensor terminal box 30, weighing sensor terminal box 30 is that the signal of three sensors is together in parallel, defeated Enter in weighing controller 30, the imbalance problem that solution is brought by multiple sensor parallel group scales.Weighing controller 30 again will Weight signal sends pulverized coal injection DCS control systems 40 to, and DCS control systems 40 for example connect middle part fluidisation regulation by circuit Valve 5010 and bottom fluidisation regulating valve 5030, according to signal is received, adjustment middle part fluidizes regulating valve 5010 and bottom fluidisation regulation The aperture of valve 5030, so as to complete to be blown the fluidisation control of tank.Meanwhile, DCS control systems 40 are also connected with middle part fluidization flux meter 5012 and bottom fluidization flux meter 5032.(middle part fluidization flux meter 5012, for detecting middle part fluidization flux;Bottom fluidisation stream Gauge 5032, for detecting bottom fluidization flux, feeds back with to DCS control systems)
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 (8)

1. a kind of blast-furnace coal powder injection process fluidizes control method, it is characterised in that the blast-furnace coal powder injection process fluidisation control Method processed includes:Middle part fluidizer is installed in injection tank, by the middle part fluidizer to injection tank middle part fluidisation stream Amount is adjusted;
The middle part fluidizer includes that middle part fluidizes regulating valve, and regulating valve is fluidized to injection tank by automatically adjusting the middle part Middle part fluidization flux is adjusted, and adjustment, spray are distinguished in the regulation of injection tank middle part fluidization flux according to the difference of injection period Blowing the period is divided into 3 stages, is respectively blown initial stage, injection middle and later periods and between injection initial stage and injection middle and later periods Injection mid-early stage;
At the injection initial stage, in more than A1, injection tank middle part fluidization flux setting value is a1 to coal dust weight in the injection tank;
In the injection middle and later periods, when coal dust weight is less than D1 in the injection tank, injection tank middle part fluidization flux setting value is d1;
Between injection initial stage and injection middle and later periods, coal dust weight is more than or equal to D1 in the injection tank, during less than A1, is blown tank Middle part fluidization flux setting value is b1;
Wherein, the unit of A1, D1 is ton, the unit Nm of a1, b1, d13/ h, a1 and d1 are unequal.
2. blast-furnace coal powder injection process as claimed in claim 1 fluidizes control method, it is characterised in that A1 is the first fixation Value.
3. blast-furnace coal powder injection process as claimed in claim 1 fluidizes control method, it is characterised in that D1 is the second fixation Value.
4. blast-furnace coal powder injection process as claimed in claim 1 fluidizes control method, it is characterised in that a1 is the 3rd fixation Value, d1 is the 4th fixed value, and a1 is more than d1.
5. blast-furnace coal powder injection process as claimed in claim 1 fluidizes control method, it is characterised in that between the identical time Every interior, the rate of change of b1 is the 5th fixed value.
6. blast-furnace coal powder injection process as claimed in claim 1 fluidizes control method, it is characterised in that injection tank middle part fluidisation Flow it is specific set formula as:
Wherein, QIn--- injection tank middle part fluidization flux setting value, unit Nm3/h;
W --- coal dust weight, unit t in injection tank.
7. blast-furnace coal powder injection process as described in any of claims 1 fluidizes control method, it is characterised in that the height Stove breeze blowing process fluidisation control method also includes:Bottom fluidizer is installed in injection tank, is fluidized by the bottom Device is adjusted to injection tank bottom fluidization flux;
The bottom fluidizer includes that bottom fluidizes regulating valve, and regulating valve is fluidized to injection tank by automatically adjusting the bottom Bottom fluidization flux is adjusted, and the regulation of injection tank bottom fluidization flux is divided into three-stage segmentation difference adjustment.
8. blast-furnace coal powder injection process as claimed in claim 7 fluidizes control method, it is characterised in that
Injection tank bottom fluidization flux it is specific set formula as:
Wherein, QUnder--- the fluidization flux setting of injection tank bottom, unit Nm3/h;
W --- coal dust weight, unit t in injection tank.
CN201710232045.5A 2017-04-11 2017-04-11 Blast-furnace coal powder injection process fluidizes control method CN106906323A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Title
李明亮 等: "高炉自动喷煤控制方案设计与实现", 《柳钢科技》 *

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Application publication date: 20170630