CN1539998A - Control method for stopping power generation systm operated by using excess pressure of blast furnace gas and relevant software - Google Patents
Control method for stopping power generation systm operated by using excess pressure of blast furnace gas and relevant software Download PDFInfo
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- CN1539998A CN1539998A CNA200310111309XA CN200310111309A CN1539998A CN 1539998 A CN1539998 A CN 1539998A CN A200310111309X A CNA200310111309X A CN A200310111309XA CN 200310111309 A CN200310111309 A CN 200310111309A CN 1539998 A CN1539998 A CN 1539998A
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Abstract
An automatic stop-controlling method for the electric generator system using the residual pressure of blast furnace gas and its software are disclosed. Said stop-controlling method includes two steps: feedforward regulation and furnace top pressure transition regulation.
Description
Technical field
The present invention relates to a kind of coal gas or other gas differential pressure power generation system and shut down the method for control (orderly closedown and emergency stop), relate in particular to the method and the software thereof of the auto stop control of a kind of blast furnace gas excess pressure power generating system.
Background technology
Blast-furnace top gas recovery energy recovery turbine power generation (be called for short blast furnace gas excess pressure power generating, or claim TRT) is the energy-conserving and environment-protective project that China's steel industry does one's utmost to promote.It is the pressure difference of utilizing between blast furnace furnace roof and the gas main, and blast furnace gas is imported the turbine acting of expanding, and drives generator for electricity generation, thus the power-saving technology that will be on the reducing valve group can be reclaimed with the pressure reduction of noise and the consumption of heat energy form.
The principle of building TRT is the ordinary production that must consideration neither influences blast furnace, generates electricity to greatest extent again.But, make to exist in many TRT projects of building in the past not to be that generated energy does not increase, influences economic benefit, influences problems such as blast furnace ordinary production exactly owing to following reason.
1, blast furnace top pressure is the most important parameter of system for blast furnace ironmaking, and furnace top pressure is regulated by high furnace control system and reducing valve group (being generally the valve of 4 parallel connections, i.e. variable valve, range valve, two emergency valves) and realized.Because blast furnace gas contains a large amount of dusts and moisture, so in the reducing valve group, remove two reducing valve (variable valve and range valve) of controlling usefulness automatically and regulate action, outside in the roof pressure variable range, making well because of often being in; The valve of two other emergency valve always is in complete shut-down or fixing aperture position during because of ordinary production, so that is difficult to open.If allow the long-term generating at full capacity of TRT, because being in closing condition for a long time, the variable valve of reducing valve group and range valve easily block, in case when TRT hinders emergency stop for some reason, the same possibility of not opening that exists.
2, for TRT emergency stop control, in the past or now the way of other unit (comprising external) is to allow the bypass quick-opening valve all open at the appointed time, and then closes slowly at the appointed time.When so often causing the bypass quick-opening valve to open, blast furnace roof pressure negative deviation is excessive; When the bypass quick-opening valve closed slowly, Controlling System was ignored blast furnace roof pressure changing conditions, by force coal gas is caught up with to blast furnace reducing valve group from TRT, in case the reducing valve group block or react slow, inevitable and cause blast furnace roof pressure superelevation limit, have a strong impact on blast furnace production.
Utilize the generating of coal gas differential pressure, the emergency stop condition is a lot, so the TRT shutdown is relatively frequent, particularly between trial run period.The defective of shutdown that TRT is frequent relatively and blast furnace reducing valve group itself must influence the production of blast furnace.This also is the major cause that causes the contradiction of iron work and TRT generating department.
If TRT can not generate electricity to greatest extent, construction investment is difficult to reclaim, and builds TRT and has also just lost meaning.TRT can not generate electricity at full capacity, and reason is not often at TRT itself, but because of after influential to blast furnace production, iron work can only generating of restricted T RT halfload even stopping production.
Summary of the invention
The objective of the invention is the characteristics of producing, problem and the mandatory principle of construction TRT that the TRT Controlling System existed in the past according to blast furnace; design studies goes out thoroughly to solve that TRT shuts down and the novel method of the influence that blast furnace reducing valve group defective is generated electricity to blast furnace ordinary production and TRT maximum load; a kind of Blast Furnace Gas Excess Pressure Power Generation System Shutting-Down Control Method and software thereof promptly are provided; thereby both made the blast furnace ordinary production, made the generating of TRT maximum load ground again.
The present invention is made of feed forward control 15 and blast furnace roof pressure control 16.These formula can change into corresponding computer software (being the part of integrated control function software) easily with algorithm and be installed among different PLC (programmable logic controller), DCS (dispersing control system) or the FCS (field bus control system).
Control method of the present invention is formed (orderly closedown is only used the 2nd step) by following 2 steps, and it is the core that TRT shuts down control.
1, feed forward control
OUT=K*F is wherein:
OUT-feed-forward regulation output valve;
F-feed-forward regulation reference point can be any one in the following parameter:
* gas flow
* variable stator vane angle aperture
* butterfly valve opening enters the mouth
* generated output
* the inverse of variable valve and range valve opening sum in the reducing valve group
K-feed-forward regulation coefficient, its size depend on the bypass quick-opening valve diameter and before
Reference point is regulated in feedback.Span: positive number arbitrarily.
2, furnace top pressure transition control (optional one of following two formula get final product)
(1) P101SP1=P101SP+N is wherein:
The P101SP-blast furnace is sent the roof pressure set(ting)value here;
P101SP1-integrated control function software roof pressure set(ting)value;
N-0～20kPa: default roof pressure deviation.
(2) P101a=P101-N is wherein:
The P101-blast furnace is sent the roof pressure observed value here;
P101 a-integrated control function software roof pressure observed value;
N-0～20kPa: default roof pressure deviation.
Regulate output valve and send bypass quick-opening valve (emergency stop) or variable stator vane angle (orderly closedown); because regulating, blast furnace reducing valve group is in automatic waiting status; in case the roof pressure observed value is higher, then can slowly opens the reducing valve group automatically, thereby realize that roof pressure is adjusted to the smooth transition of high furnace side.If blast furnace reducing valve group or regulation system fault, then the roof pressure adjusting that is made of TRT bypass quick-opening valve or variable stator vane angle can continue to carry out always, regulates normal until the reducing valve group.
Involved in the present invention to comprehensive function control software (10) comprise that raising speed control (11), volume power control (12), generator operation control and blast furnace roof pressure regulate (13), also comprise simultaneously and call emergency stop control respectively and orderly closedown is controlled (14); Shutting down control is made up of feed forward control (15) and blast furnace roof pressure control (16).
The present invention has the following advantages and positively effect:
1. stopping process is for automatically finishing, and the operative employee need only monitor that control process gets final product.
2. overcome the deficiency of in the past shutting down control method fully, so blast furnace system can be produced relievedly safely.
3. according to Ma Gang and the nearest Shanghai one steel 2500m that goes into operation
3Blast furnace TRT engineering operation situation; owing to adopted new shutdown control method; the TRT system also can generate electricity to greatest extent; generated output reaches or greater than designed capacity (more than the 8000KW); by present electricity price and TRT working time as can be known; in 2～3 years recyclable fully invested, for the user has obtained good economic benefits.
Description of drawings
The composition and the process flow sheet thereof of Fig. 1-TRT system.
Wherein:
The 1-blast furnace; The 2-fly-ash separator; 3-coal gas cleans; 4-inlet dish valve; 5-reducing valve group; BF-hydraulic pressure push-pull valve; The 8-emergency cutting off valve; The 6-turbine; The 7-generator; 9-changes down the pass by-pass valve soon, is called for short the bypass quick-opening valve; The 10-integrated control function software.
The sequence of control block diagram of Fig. 2-TRT system (be mainly and shut down the sequence of control block diagram).
Wherein:
The control of 11-raising speed; The control of 12-volume power;
Control of 13-generator operation and blast furnace roof pressure are regulated; The 14-orderly closedown;
The 15-feed forward control; The control of 16-blast furnace roof pressure;
17-closes variable stator vane angle; 18-closes the inlet/outlet push-pull valve.
Embodiment
Describe in detail below in conjunction with drawings and Examples
As shown in Figure 1, the high pressure gas of sending from blast furnace 1 through fly-ash separator 2 and coal gas clean 3 handle after, the one tunnel on reducing valve group 5 gas delivery house stewards; Another road enters turbine 6 acting of expanding through inlet dish valve 4, inlet hydraulic pressure push-pull valve BF, emergency cutting off valve 8 successively, and turbine 6 drives generators 7 generatings, and the low-pressure gas after the expansion is through outlet plate butterfly valve BF, delivers on the gas main after the reducing valve group 5.
After inlet hydraulic pressure push-pull valve BF; before the outlet hydraulic pressure push-pull valve BF; emergency cutting off valve 8 and turbine 6 places are parallel with a bypass pipe; it is provided with to change down soon and closes by-pass valve (being called for short bypass quick-opening valve 9); during as the TRT emergency stop; the usefulness of the smooth transition between TRT and the reducing valve group 5 does not produce big fluctuation to guarantee blast furnace top pressure.
Control to the TRT system realizes that by integrated control function software 10 its function mainly contains:
* the start-up control of subsystem
* the raising speed of main frame control
* volume power control
* furnace top pressure control and Generation Control to greatest extent
* TRT shuts down control (orderly closedown and emergency stop)
Wherein shutting down control is one of TRT system most important control.
As shown in Figure 2,
* after the TRT startup is ready to, can start raising speed control 11.In boosting velocity procedure (being generally 10-30 minute), integrated control function software 10 calls the emergency stop program at any time automatically according to each parameter changing conditions of TRT system and blast furnace situation.
* after TRT is incorporated into the power networks, promptly carried out volume power control 12.In volume power process (being generally 5-10 minute), integrated control function software 10 calls the emergency stop program at any time automatically according to each parameter changing conditions of TRT system and blast furnace situation.
* the TRT volume power near design load after, promptly carried out generator operation control and blast furnace roof pressure and regulated 13.In this process (being ordinary production), integrated control function software 10 calls shutdown procedure at any time automatically according to each parameter changing conditions of TRT system and blast furnace situation.
* press TRT orderly closedown button, promptly carried out orderly closedown 14.But in this process, integrated control function software 10 calls the emergency stop program at any time automatically according to each parameter changing conditions of TRT system and blast furnace situation.
In case * emergency stop condition (generally having 10-35) takes place, integrated control function software 10 promptly changes the control of TRT emergency stop over to:
---feed forward control 15, open fixedly aperture of bypass quick-opening valve one according to OUT=K*F, simultaneously the quick closing valve emergency cutting off valve.
---blast furnace roof pressure control 16, the Controlling System that constitutes according to P101SP1=P101SP+N or P101a=P101-N realizes the smooth transition of TRT control furnace top pressure to blast furnace.
* closing variable stator vane angle 17 and closing the inlet butterfly valve is the subsequent step of emergency stop, and it can be carried out synchronously with closing emergency cutting off valve, also can be step-wise execution, can determine according to the engineering particular case is on-the-spot.
* close inlet/outlet push-pull valve 18 and be the subsequent step of emergency stop, be generally on-site manual and finish, do not carry out in order to shorten the off-time sometimes.
Specific embodiment of the present invention---horse steel 2500m
3Blast furnace TRT engineering.
When having satisfied the machine condition that opens, 10 follow procedures of integrated control function software are finished following controlled function:
Start to prepare, TRT rises that rotating speed control, is incorporated into the power networks, volume power control, blast furnace top pressure control and the TRT orderly closedown is controlled, emergency stop is controlled.In each control process, the emergency stop program can work at any time, and promptly the emergency stop program priority is the highest.
Totally 24 of horse steel TRT auto stop conditions, such as when following main halt condition takes place, integrated control function software 10 can make the TRT hard stop in the computer:
* the turbine shaft vibration is greater than 0.16mm
* the axial displacement of turbine main shaft is greater than 0.5mm
* the turbine rotating speed is greater than 3240r/min
* lubricating oil solstics pressure is less than 70kPa
* hydraulic fluid pressure is less than 7.0MPa
* turbine and dynamo bearing temperature are greater than 75 ℃
* turbine thrust bearing shoe valve temperature is greater than 75 ℃
* power system catastrophe failure
* turbine emergency overspeed governor oil pressure is lower than 3.5Mpa
* the emergency stop button is pressed (comprising the emergency stop button on emergency cutting off valve local operation case and the watch-keeping cubicle operator's console)
* Blast Furnace Throat Ventilation Valve is opened etc.
When condition was interlocked in the arbitrary shutdown more than occurring, Controlling System was sent signal and is made generator 7 and grid disconnection, and emergency cutting off valve 8, variable stator vane angle JY are closed, and bypass quick-opening valve 9 enters the feed-forward regulation state.Feedforward control system makes bypass quick-opening valve 9 open certain aperture (this aperture is to obtain by integrated control function software 10 computings), the smooth transition under the realization emergency switching-off situation between TRT furnace top pressure regulation system and blast furnace top pressure regulation system before emergency stop.
After the aperture of bypass quick-opening valve 9 meets the requirements of aperture fast, promptly enter the furnace top pressure adjustment state, the observed value of its pressure is consistent during with the TRT ordinary production with set(ting)value, but the result that integrated control function software 10 computings are regulated, and forces blast furnace gas from the TRT reducing valve group 5 of flowing through.If reducing valve group 5 is blocked, the furnace top pressure of being undertaken by feedforward control system is regulated until reducing valve group 5 and is recovered normal fully; If reducing valve group 5 is slowly opened, bypass quick-opening valve 9 can slowly cut out under the stable prerequisite of furnace top pressure guaranteeing, until bypass quick-opening valve 9 complete shut-downs.
Claims (2)
1, a kind of Blast Furnace Gas Excess Pressure Power Generation System Shutting-Down Control Method is characterized in that:
1) feed-forward regulation
OUT＝K*F
Wherein:
OUT-feed-forward regulation output valve;
F-feed-forward regulation reference point, or be gas flow, or be the variable stator vane angle aperture, or be the inlet butterfly valve opening, or be generated output, or be the inverse of variable valve and range valve opening sum in the reducing valve group;
K-feed-forward regulation coefficient, its size depend on the diameter and the feed-forward regulation reference point of bypass quick-opening valve, and span is positive number arbitrarily;
2) the blast furnace roof pressure is regulated
1. or be P101SP1=P101SP+N
Wherein: the P101SP-blast furnace is sent the roof pressure set(ting)value here;
P101SP1-integrated control function software roof pressure set(ting)value;
N-0～20kPa, default roof pressure deviation;
2. or be P101a=P101-N
Wherein: the P101-blast furnace is sent the roof pressure observed value here;
P101a-integrated control function software roof pressure observed value;
N-0～20kPa, default roof pressure deviation.
2, implement the software (10) of the described method of claim 1, it is characterized in that:
In case halt condition takes place, integrated control function software (10) promptly changes TRT over to and shuts down control,
Feed forward control (15) is opened fixedly aperture of bypass quick-opening valve one according to OUT=K*F, simultaneously quick closing valve emergency cutting off valve (8);
Blast furnace roof pressure control (16), the Controlling System that constitutes according to P101SP1=P101SP+N or P101a=P101-N realizes the smooth transition of TRT control furnace top pressure to blast furnace;
Close variable stator vane angle (17) and close the subsequent step of inlet butterfly valve for shutting down, it can be carried out synchronously with closing emergency cutting off valve (8), also can be step-wise execution, can determine according to the engineering particular case is on-the-spot;
Close the subsequent step of inlet/outlet push-pull valve (18), be generally on-site manual to finish, do not carry out in order to shorten the off-time sometimes for shutting down.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111309 CN1217011C (en) | 2003-10-31 | 2003-10-31 | Control method for stopping power generation systm operated by using excess pressure of blast furnace gas and relevant software |
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| CN 200310111309 CN1217011C (en) | 2003-10-31 | 2003-10-31 | Control method for stopping power generation systm operated by using excess pressure of blast furnace gas and relevant software |
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| CN1217011C CN1217011C (en) | 2005-08-31 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778847A (en) * | 2012-07-06 | 2012-11-14 | 西安陕鼓动力股份有限公司 | Automatic shutdown method of electric towing turbine unit in failure of controlling system and oil system |
| CN102994672A (en) * | 2012-11-30 | 2013-03-27 | 武汉钢铁(集团)公司 | Automatic control method for top pressure of TRT (blast furnace top gas recovery turbine unit) system |
| CN103161533A (en) * | 2012-08-16 | 2013-06-19 | 襄阳航力机电技术发展有限公司 | Turbo-expander power generating method with utilization of chemical exhaust |
| CN103509895A (en) * | 2013-10-09 | 2014-01-15 | 马钢(集团)控股有限公司 | Method for controlling pressure of furnace top of blast furnace by combining TRT stationary blade and pressure reducing valve group |
| CN105986047A (en) * | 2015-02-25 | 2016-10-05 | 鞍钢股份有限公司 | Method for controlling bearing bush grinding of blast furnace top gas recovery turbine unit |
| CN111020081A (en) * | 2019-11-20 | 2020-04-17 | 张家港宏昌钢板有限公司 | Automatic optimization control structure and control method for mutual redundancy of multiple systems of blast furnace |
| CN113201610A (en) * | 2021-04-21 | 2021-08-03 | 北京首钢自动化信息技术有限公司 | Control method and system for blast furnace top pressure |
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| CN104462791B (en) * | 2014-11-24 | 2018-03-13 | 中冶南方工程技术有限公司 | A kind of method that determination TRT jerk emergency pressure reducing valve groups promptly calculate angle |
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- 2003-10-31 CN CN 200310111309 patent/CN1217011C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778847A (en) * | 2012-07-06 | 2012-11-14 | 西安陕鼓动力股份有限公司 | Automatic shutdown method of electric towing turbine unit in failure of controlling system and oil system |
| CN102778847B (en) * | 2012-07-06 | 2015-07-08 | 西安陕鼓动力股份有限公司 | Automatic shutdown method of electric towing turbine unit in failure of controlling system and oil system |
| CN103161533A (en) * | 2012-08-16 | 2013-06-19 | 襄阳航力机电技术发展有限公司 | Turbo-expander power generating method with utilization of chemical exhaust |
| CN102994672A (en) * | 2012-11-30 | 2013-03-27 | 武汉钢铁(集团)公司 | Automatic control method for top pressure of TRT (blast furnace top gas recovery turbine unit) system |
| CN102994672B (en) * | 2012-11-30 | 2014-11-26 | 武汉钢铁(集团)公司 | Automatic control method for top pressure of TRT (blast furnace top gas recovery turbine unit) system |
| CN103509895A (en) * | 2013-10-09 | 2014-01-15 | 马钢(集团)控股有限公司 | Method for controlling pressure of furnace top of blast furnace by combining TRT stationary blade and pressure reducing valve group |
| CN103509895B (en) * | 2013-10-09 | 2016-04-20 | 马钢(集团)控股有限公司 | The method for controlling pressure of blast furnace top that a kind of TRT stator blade and reducer unit combine |
| CN105986047A (en) * | 2015-02-25 | 2016-10-05 | 鞍钢股份有限公司 | Method for controlling bearing bush grinding of blast furnace top gas recovery turbine unit |
| CN111020081A (en) * | 2019-11-20 | 2020-04-17 | 张家港宏昌钢板有限公司 | Automatic optimization control structure and control method for mutual redundancy of multiple systems of blast furnace |
| CN111020081B (en) * | 2019-11-20 | 2021-11-02 | 张家港宏昌钢板有限公司 | Automatic optimization control structure and control method for mutual redundancy of multiple systems of blast furnace |
| CN113201610A (en) * | 2021-04-21 | 2021-08-03 | 北京首钢自动化信息技术有限公司 | Control method and system for blast furnace top pressure |
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| CN1217011C (en) | 2005-08-31 |
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Assignee: MCC Southern Automation (Wuhan) Co., Ltd. Assignor: WISDRI Engineering & Research Incorporation Limited Contract fulfillment period: 2006.1.26 to 2023.10.12 contract change Contract record no.: 2008420010011 Denomination of invention: Control method for stopping power generation systm operated by using excess pressure of blast furnace gas and relevant software Granted publication date: 20050831 License type: Exclusive license Record date: 2008.10.9 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2006.1.26 TO 2023.10.12; CHANGE OF CONTRACT Name of requester: CHINA METALLURGICAL SOUTHERN CO. ( WUHAN ) AUTOMAT Effective date: 20081009 |
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Granted publication date: 20050831 Termination date: 20131031 |