CN110145760A - A kind of BFG boiler air-supply optimal control method - Google Patents
A kind of BFG boiler air-supply optimal control method Download PDFInfo
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- CN110145760A CN110145760A CN201910422482.2A CN201910422482A CN110145760A CN 110145760 A CN110145760 A CN 110145760A CN 201910422482 A CN201910422482 A CN 201910422482A CN 110145760 A CN110145760 A CN 110145760A
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- bfg
- boiler
- flue gas
- air
- control method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N2005/185—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
A kind of BFG boiler air-supply optimal control method, includes the following steps: that the Oxygen Amount in Flue Gas setting value by target BFG boiler subtracts flue gas oxygen content measured value and obtains Oxygen Amount in Flue Gas deviation signal；Oxygen Amount in Flue Gas deviation signal is inputted into PI controller, PI controller is based on control parameter and calculates PI operation output quantity；Blast furnace gas main pipe gas flow is converted to obtain air quantity instruction；Air quantity is instructed, air quantity given value is calculated through oxygen amount revision directive；Air quantity given value is subtracted into actual measurement total blast volume and obtains air output adjusting deviation signal；Air output adjusting deviation signal obtains pressure fan frequency conversion input quantity by PI operation；Pressure fan power output is adjusted by pressure fan frequency conversion input quantity.The present invention continuously adjusts air-supply frequency control response flue gas oxygen content change of error to air output, but also the variation of energy quick response fuel quantity is disturbed in inhibition system to stablize boiler combustion, improves generating set operation stability.
Description
Technical field
The invention belongs to thermal technics technical fields, and in particular to a kind of BFG(Blast Furnace Gas) boiler
Air-supply optimal control method.
Background technique
In steel mill's steelmaking process, largely generate blast furnace gas, the BFG boiler of auxiliary construction by blast furnace gas full combustion simultaneously
It is converted into electric flux, realizes the secondary use of resource.
For conventional coal-burning power plant, Load Regulation is typically all that the load of steam turbine, steam turbine load are determined according to electric load
The variation of main steam pressure is arrived in variation reflection, and then boiler adjusts inlet fuel amount according to main steam pressure.The combustion of BFG boiler
Material is directly derived from steel mill's blast furnace gas pipeline network, compared with coal-burning power plant, the not process of preparation of fuel, but the dosage of blast furnace gas
It is influenced by steel mill's gas production and the other users of steel mill.The peace of steel mill's energy scheduling is mainly accepted in the control of BFG boiler oil amount
Row, cannot generally be adjusted according to generated energy, but in turn, the generated energy of unit is determined according to the amount of blast furnace gas.Due to
It directly is derived from blast furnace gas pipeline network, the pressure oscillation of blast furnace gas is very big, and burning adjusts and is difficult in the automatic control of BFG boiler
It has thrown automatically, since putting into operation, burning adjusts fluctuation of service always for certain power plant, and blast-furnace gas pressure fluctuation has an effect on combustion chamber draft
Automatic adjustment, so that the automatic adjustment of combustion chamber draft is also not very stable.The fluctuation of combustion chamber draft can produce overheat temperature control
Raw lasting disturbance, exacerbates the operating frequency of desuperheating water tune valve, shortens the service life of desuperheating water tune valve.
The adjusting of air output is that the burning of BFG boiler is adjusted.The delay of the regulating loop is especially big, is directly contained with flue gas
Oxygen amount is unable to satisfy adjusting requirement to correct air output.According to principle of heat balance, when fuel value and air output reach
The burning of boiler is most abundant when one appropriate proportion.Because the means that the calorific value of blast furnace gas is not directly measured, are adopted
Calorific value and air output is replaced to balance with the flow of blast furnace gas.Actual air output adjusting is passed through according to blast furnace gas flow
Function f2(x) the air quantity given value corrected again by oxygen amount after converting adjusts pressure fan by the frequency of increase and decrease air-supply frequency conversion
Revolving speed.
Summary of the invention
The present invention aiming at the shortcomings in the prior art, provides a kind of BFG boiler air-supply optimal control method, can be in steel mill
When the fuel quantity variation sent, adjust air-supply frequency control response flue gas oxygen content change of error continuously to air output
Section, but the variation of energy quick response fuel quantity is disturbed in inhibition system to stablize boiler combustion, and it is steady to improve generating set operation
It is qualitative
To achieve the above object, the invention adopts the following technical scheme:
A kind of BFG boiler air-supply optimal control method, which comprises the steps of:
Step 1: the Oxygen Amount in Flue Gas setting value SP of target BFG boiler subtracted and is obtained by zirconium oxide oxygen content transducer measurement
Flue gas oxygen content measured value PV obtains Oxygen Amount in Flue Gas deviation signal △ Ox；
Step 2: Oxygen Amount in Flue Gas deviation signal △ Ox is inputted into PI controller, PI controller is based on control parameter and calculates PI operation
Output quantity U0；
Step 3: by U0Through f1(x) functional transformation to 0.8 ~ 1.2 coefficient section obtains oxygen amount revision directive Uf1；
Step 4: by blast furnace gas main pipe gas flow through f2(x) function converts to obtain air quantity instruction Uf2；
Step 5: air quantity is instructed into Uf2With oxygen amount revision directive Uf1Multiplication obtains air quantity given value；
Step 6: air quantity given value is subtracted, air output adjusting deviation signal is obtained by the total blast volume that air quantity transmitter is surveyed；
Step 7: air output adjusting deviation signal obtains pressure fan frequency conversion input quantity by PI operation；
Step 8: pressure fan is adjusted by pressure fan frequency conversion input quantity and is contributed to furnace air distribution, generates burner hearth cigarette with coal dust firing
Gas.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
Further, the burner hearth flue gas that the zirconium oxide oxygen content transducer measurement burner hearth generates, obtains flue gas oxygen content measured value
PV。
Further, the air quantity of the air quantity transmitter measurement pressure fan output, obtains actual measurement total blast volume.
Further, the f1(x) function is as follows:
Work as U0When=- 100, f1(x) output factor 0.8；
Work as U0When=0, f1(x) output factor 1.0；
Work as U0When=100, f1(x) output factor 1.2.
Further, the f2(x) function is the proportion function of gas flow and air quantity, is obtained according to manufactory's specification
Out.
Further, in the step 1, flue gas oxygen content setting value and flue gas oxygen content measured value are normalized to
The percentage of range ability.
Further, in the step 2, the control parameter of PI controller is as follows: the value of proportional gain Kp is 0.01, product
The value of Ti is 20s between timesharing.
Further, in the step 6, air quantity given value and actual measurement total blast volume are normalized to the hundred of range ability
Score.
Further, in the step 7, the control parameter of PI controller is as follows: the value of proportional gain Kp is 0.1, integral
The value of time Ti is 10s.
The beneficial effects of the present invention are: air output energy Rapid matching fuel quantity, effectively inhibits blast furnace gas disturbing source
Sporadic interference improves the Control platform that burning is adjusted, and burning is inhibited to adjust combustion chamber draft and overheat temperature
In disturb, stabilize burning situation in furnace, slow down the operating frequency of desuperheating water tune valve, extend desuperheating water tune valve use the longevity
Life；Improved BFG boiler air blowing control can both make frequency control sound of blowing in the blast furnace gas amount variation that steel mill sends
It answers flue gas oxygen content to change and the difference adjusting that continuously disappears, and the variation of energy quick response blast furnace coal tolerance is carried out to flue gas oxygen content, surely
Determine boiler combustion, reduce the frequent movement of desuperheating water tune valve, extend the service life of desuperheating water tune valve, improves generating set operation
Stability.
Detailed description of the invention
Fig. 1 is BFG boiler air-supply optimal control method block diagram of the invention.
Fig. 2 is BFG boiler air-supply optimal control method flow chart of the invention.
Fig. 3 is f of the invention1(x) function schematic diagram.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.
The optimal control method of Rapid matching gas boiler fuel quantity of the invention can be in all kinds of distributed monitoring control systems
Directly realized by configuration mode.
Before using the present invention, unit blast furnace gas flow in most runing time is in unordered undulating
State.And after applying the present invention, air output energy Rapid matching fuel quantity effectively inhibits the sporadic dry of blast furnace gas disturbing source
It disturbs, improves the Control platform that burning is adjusted, and inhibit burning to disturbing in combustion chamber draft and overheat temperature adjusting, surely
Determine burning situation in furnace, slowed down the operating frequency of desuperheating water tune valve, extends the service life of desuperheating water tune valve.
A kind of BFG boiler air-supply optimal control method as shown in Figure 1 and Figure 2, includes the following steps:
Step 1: the Oxygen Amount in Flue Gas setting value SP of target BFG boiler subtracted and is obtained by zirconium oxide oxygen content transducer measurement
Flue gas oxygen content measured value PV obtains Oxygen Amount in Flue Gas deviation signal △ Ox.Zirconium oxide oxygen content transducer measures the burner hearth that burner hearth generates
Flue gas obtains flue gas oxygen content measured value PV.When calculating, by flue gas oxygen content setting value and flue gas oxygen content measured value normalizing
Change the percentage to range ability.
Step 2: Oxygen Amount in Flue Gas deviation signal △ Ox is inputted into PI controller, PI controller is based on control parameter and calculates PI
Operation output quantity U0.The control parameter of PI controller is as follows: the value of proportional gain Kp is 0.01, and the value of time of integration Ti is 20s.
Step 3: by U0Through f1(x) functional transformation to 0.8 ~ 1.2 coefficient section obtains oxygen amount revision directive Uf1。f1(x)
Function is as shown in Figure 3:
Work as U0When=- 100, f1(x) output factor 0.8；
Work as U0When=0, f1(x) output factor 1.0；
Work as U0When=100, f1(x) output factor 1.2.
Step 4: by blast furnace gas main pipe gas flow through f2(x) function converts to obtain air quantity instruction Uf2。f2(x) function
For the proportion function of gas flow and air quantity, obtained according to manufactory's specification.
Step 5: air quantity is instructed into Uf2With oxygen amount revision directive Uf1Multiplication obtains air quantity given value.
Step 6: air quantity given value is subtracted, air output adjusting deviation letter is obtained by the total blast volume that air quantity transmitter is surveyed
Number.Air quantity transmitter measures the air quantity of pressure fan output, obtains actual measurement total blast volume.When calculating, by air quantity given value and actual measurement
Total blast volume normalizes to the percentage of range ability.
Step 7: air output adjusting deviation signal obtains pressure fan frequency conversion input quantity by PI operation.The control of PI controller
Parameter processed is as follows: the value of proportional gain Kp is 0.1, and the value of time of integration Ti is 10s.
Step 8: pressure fan is adjusted by pressure fan frequency conversion input quantity and is contributed to furnace air distribution, generates furnace with coal dust firing
Thorax flue gas.
Improved BFG boiler air blowing control can both make frequency conversion of blowing in the blast furnace gas amount variation that steel mill sends
Control response flue gas oxygen content, which changes, carries out the difference adjusting that continuously disappears, and the change of energy quick response blast furnace coal tolerance to flue gas oxygen content
Change, stablize boiler combustion, reduce the frequent movement of desuperheating water tune valve, extend the service life of desuperheating water tune valve, improves generator
Group operation stability.
It should be noted that the term of such as "upper", "lower", "left", "right", "front", "rear" cited in invention, also
Only being illustrated convenient for narration, rather than to limit the scope of the invention, relativeness is altered or modified, in nothing
Under essence change technology contents, when being also considered as the enforceable scope of the present invention.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (9)
- The optimal control method 1. a kind of BFG boiler is blown, which comprises the steps of:Step 1: the Oxygen Amount in Flue Gas setting value SP of target BFG boiler subtracted and is obtained by zirconium oxide oxygen content transducer measurement Flue gas oxygen content measured value PV obtains Oxygen Amount in Flue Gas deviation signal △ Ox；Step 2: Oxygen Amount in Flue Gas deviation signal △ Ox is inputted into PI controller, PI controller is based on control parameter and calculates PI operation Output quantity U0；Step 3: by U0Through f1(x) functional transformation to 0.8 ~ 1.2 coefficient section obtains oxygen amount revision directive Uf1；Step 4: by blast furnace gas main pipe gas flow through f2(x) function converts to obtain air quantity instruction Uf2；Step 5: air quantity is instructed into Uf2With oxygen amount revision directive Uf1Multiplication obtains air quantity given value；Step 6: air quantity given value is subtracted, air output adjusting deviation signal is obtained by the total blast volume that air quantity transmitter is surveyed；Step 7: air output adjusting deviation signal obtains pressure fan frequency conversion input quantity by PI operation；Step 8: pressure fan is adjusted by pressure fan frequency conversion input quantity and is contributed to furnace air distribution, generates burner hearth cigarette with coal dust firing Gas.
- The optimal control method 2. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that: the zirconium oxide oxygen amount Transmitter measures the burner hearth flue gas that burner hearth generates, and obtains flue gas oxygen content measured value PV.
- The optimal control method 3. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that: the air quantity transmitter The air quantity for measuring pressure fan output obtains actual measurement total blast volume.
- The optimal control method 4. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that: the f1(x) function is such as Under:Work as U0When=- 100, f1(x) output factor 0.8；Work as U0When=0, f1(x) output factor 1.0；Work as U0When=100, f1(x) output factor 1.2.
- The optimal control method 5. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that: the f2(x) function is The proportion function of gas flow and air quantity is obtained according to manufactory's specification.
- The optimal control method 6. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that:, will in the step 1 Flue gas oxygen content setting value and flue gas oxygen content measured value normalize to the percentage of range ability.
- The optimal control method 7. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that: in the step 2, PI The control parameter of controller is as follows: the value of proportional gain Kp is 0.01, and the value of time of integration Ti is 20s.
- The optimal control method 8. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that:, will in the step 6 Air quantity given value and actual measurement total blast volume normalize to the percentage of range ability.
- The optimal control method 9. a kind of BFG boiler as described in claim 1 is blown, it is characterised in that: in the step 7, PI The control parameter of controller is as follows: the value of proportional gain Kp is 0.1, and the value of time of integration Ti is 10s.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822471A (en) * | 2019-12-02 | 2020-02-21 | 国惠环保新能源有限公司 | System and method for determining total air volume of boiler combustion system |
| CN111089296A (en) * | 2019-12-30 | 2020-05-01 | 江苏弘成环保科技有限公司 | Automatic control method for fresh air supply of hazardous waste incineration rotary kiln |
| CN111443594A (en) * | 2020-03-13 | 2020-07-24 | 华电电力科学研究院有限公司 | Boiler oxygen content tracking control method based on estimation model |
| CN111578307A (en) * | 2020-06-04 | 2020-08-25 | 杭州和利时自动化有限公司 | Fan control method, system and device for gas boiler air-smoke system |
| CN114135898A (en) * | 2021-09-30 | 2022-03-04 | 华电电力科学研究院有限公司 | Oxygen amount optimization control method for coal-fired power plant boiler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000120406A (en) * | 1998-10-19 | 2000-04-25 | Kawasaki Steel Corp | Operation method of preheater for blast furnace gas expander plant |
| CN104676638A (en) * | 2015-01-14 | 2015-06-03 | 冉启发 | Method of controlling low-nitrogen combustion damper in load-down process of boiler |
| CN105627356A (en) * | 2015-12-31 | 2016-06-01 | 北京和隆优化科技股份有限公司 | Combustion optimization control system of metallurgical gas boiler |
-
2019
- 2019-05-21 CN CN201910422482.2A patent/CN110145760A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000120406A (en) * | 1998-10-19 | 2000-04-25 | Kawasaki Steel Corp | Operation method of preheater for blast furnace gas expander plant |
| CN104676638A (en) * | 2015-01-14 | 2015-06-03 | 冉启发 | Method of controlling low-nitrogen combustion damper in load-down process of boiler |
| CN105627356A (en) * | 2015-12-31 | 2016-06-01 | 北京和隆优化科技股份有限公司 | Combustion optimization control system of metallurgical gas boiler |
Non-Patent Citations (2)
| Title |
|---|
| 朱兆恒: "《火电厂热工自动化***试验》", 31 January 2006 * |
| 田通: "220t/h高温高压煤气锅炉+50MW汽轮发电机组自动控制***及其送风自动调节***的改进", 《中国优秀硕士学位论文全文数据库（工程科技I辑）》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822471A (en) * | 2019-12-02 | 2020-02-21 | 国惠环保新能源有限公司 | System and method for determining total air volume of boiler combustion system |
| CN111089296A (en) * | 2019-12-30 | 2020-05-01 | 江苏弘成环保科技有限公司 | Automatic control method for fresh air supply of hazardous waste incineration rotary kiln |
| CN111443594A (en) * | 2020-03-13 | 2020-07-24 | 华电电力科学研究院有限公司 | Boiler oxygen content tracking control method based on estimation model |
| CN111578307A (en) * | 2020-06-04 | 2020-08-25 | 杭州和利时自动化有限公司 | Fan control method, system and device for gas boiler air-smoke system |
| CN111578307B (en) * | 2020-06-04 | 2022-08-02 | 杭州和利时自动化有限公司 | Fan control method, system and device for gas boiler air-smoke system |
| CN114135898A (en) * | 2021-09-30 | 2022-03-04 | 华电电力科学研究院有限公司 | Oxygen amount optimization control method for coal-fired power plant boiler |
| CN114135898B (en) * | 2021-09-30 | 2023-06-27 | 华电电力科学研究院有限公司 | Oxygen amount optimization control method for coal-fired power plant boiler |
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Application publication date: 20190820 |