CN103567052B - A kind of coal pulverizer starts control system and method - Google Patents
A kind of coal pulverizer starts control system and method Download PDFInfo
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- CN103567052B CN103567052B CN201310560440.8A CN201310560440A CN103567052B CN 103567052 B CN103567052 B CN 103567052B CN 201310560440 A CN201310560440 A CN 201310560440A CN 103567052 B CN103567052 B CN 103567052B
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Abstract
The invention discloses a kind of coal pulverizer and start control system, described startup control system comprises: step down start equipment, for sending the reduced-voltage starting order of coal pulverizer described in reduced-voltage starting, and pressure control device, be connected with described step down start equipment, after receiving described reduced-voltage starting order, the unit main vapour pressure initial set value controlling described coal pulverizer reduces a preset value, and start when coal pulverizer starts control through reduce main vapour pressure setting value recover to former setting value, thus the unit pressure change returning to the described coal pulverizer that described initial set value causes after making the unit main vapour pressure initial set value controlling described coal pulverizer reduce described preset value more partially or completely can offset the pressure change starting described coal pulverizer and cause, thus the device damage avoided because superpressure may cause and security incident.
Description
Technical field
The present invention relates to fired power generating unit cooperation control field, particularly, relate to a kind of coal pulverizer and start control system and method.
Background technology
Along with the fast development of power industry, the ratio of mill coal pulverizer system shared by thermal power generation unit is more and more large.But mill coal pulverizer system frequently start stop operation causes serious interference to the stable of unit main vapour pressure, and unit superpressure may be caused even to shut down.
From coal pulverizer operation process process, with certain load during the start and stop of coal pulverizer, therefore the start and stop of coal pulverizer can be regarded as a kind of fuel flow disturbance by a relatively large margin in a certain sense.Need to be overcome fast by combustion control system.But the perturbation amplitude starting the fuel quantity caused due to coal pulverizer is very large, even if eliminate disturbance soon, also inevitably brings the fluctuation by a relatively large margin of main vapour pressure.
In existing unit control system, when starting, need for fired power generating unit AGC control design case load breakpoints, and by the start and stop of operations staff's Non-follow control, in load up process, after startup coal pulverizer, main vapour pressure superpressure can be caused.The existence of breakpoint makes AGC lose continuity, in addition, coal pulverizer is from First air directly defeated powder in stove, the powder feeding ability of First air has very complicated characteristic in the start and stop mill stage, and the impact that the operation that can be subject to operations staff is practised, the usual start and stop stage can have a huge impact main vapour pressure.Therefore, current coal pulverizer Starting mode directly can have influence on the quality that puts into operation of unit AGC, even can have influence on the safety of unit, causes device damage even security incident.
Summary of the invention
The object of this invention is to provide a kind of coal pulverizer and start control system and control method, to reduce the impact on main vapour pressure when coal pulverizer starts, thus the device damage avoided because superpressure may cause and security incident.
To achieve these goals, the invention provides a kind of coal pulverizer and start control system, described startup control system comprises: step down start equipment, for sending the reduced-voltage starting order of coal pulverizer described in reduced-voltage starting, and pressure control device, be connected with described step down start equipment, after receiving described reduced-voltage starting order, the unit main vapour pressure initial set value controlling described coal pulverizer reduces a preset value, and start when coal pulverizer starts control through reduce main vapour pressure setting value recover to described initial set value, thus the unit pressure change returning to the described coal pulverizer that described initial set value causes after making the unit main vapour pressure initial set value controlling described coal pulverizer reduce described preset value more partially or completely can offset the pressure change starting described coal pulverizer and cause.
The present invention also provides a kind of coal pulverizer to start control method, and described startup control method comprises: the reduced-voltage starting order receiving coal pulverizer described in reduced-voltage starting; The unit main vapour pressure initial set value controlling described coal pulverizer reduces a preset value; Control described coal pulverizer to start to start, the main vapour pressure setting value simultaneously controlled through reducing is recovered to described initial set value, thus the unit pressure change returning to the described coal pulverizer that described initial set value causes after making the unit main vapour pressure initial set value controlling described coal pulverizer reduce described preset value more partially or completely can offset the pressure change starting described coal pulverizer and cause.
Main vapour pressure is reduced a preset value by pressure control device by the present invention before coal pulverizer starts, and start when coal pulverizer starts control through reduce main vapour pressure setting value recover to described initial set value, thus the unit pressure change making the unit main vapour pressure controlling described coal pulverizer reduce the described coal pulverizer that described preset value causes partially or completely can offset the pressure change starting described coal pulverizer and cause, because this reducing the impact on main vapour pressure when coal pulverizer starts, thus the device damage avoided because superpressure may cause and security incident.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the block diagram starting control system according to the coal pulverizer of embodiment of the present invention;
Fig. 2 is the block diagram starting control system according to the coal pulverizer of a kind of preferred embodiment of the present invention;
Fig. 3 is the flow chart starting control procedure according to the coal pulverizer of a kind of preferred embodiment of the present invention; And
Fig. 4 is the figure starting a dialog box in the man-machine interface controlled for coal pulverizer according to one embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 is the block diagram starting control system according to the coal pulverizer of embodiment of the present invention.As shown in Figure 1, coal pulverizer provided by the invention starts control system and can comprise: step down start equipment 100, for sending the reduced-voltage starting order of reduced-voltage starting coal pulverizer; And pressure control device 200, be connected with step down start equipment 100, after receiving reduced-voltage starting order, the unit main vapour pressure initial set value controlling coal pulverizer reduces a preset value, and start the main vapour pressure setting value controlled through reducing when coal pulverizer starts and recover to initial set value, thus the unit pressure change unit main vapour pressure controlling coal pulverizer being reduced return to the coal pulverizer that described initial set value causes after preset value more partially or completely can offset the pressure change starting coal pulverizer and cause.
Fig. 2 is the block diagram starting control system according to the coal pulverizer of a kind of preferred embodiment of the present invention.In this embodiment, reduced-voltage starting button 101 is used to send reduced-voltage starting order.Can find out according to Fig. 2 in addition, this control system can also comprise quick start button 101, starts immediately for indicating coal pulverizer in some cases, SR 120, is used to indicate coal pulverizer and does not start, and indicates main vapour pressure setting value to return to original set value, impulse generator 212, it is input as the enabling signal 314 of coal pulverizer, namely this impulse generator 212 production burst signal is triggered when coal pulverizer starts, the enabling signal 314 should noting this coal pulverizer in this embodiment and be different from reduced-voltage starting order, but should be appreciated that reduced-voltage starting order can be adopted to trigger this impulse generator 212 production burst signal, T module (handover module) 211, it is input as the output of pulse trigger 212, is triggered by pulse, when trigger condition is " 1 ", selects Y2 to export, and when trigger condition is " 0 ", selects N2 to export, or logic 201, it is input as the output of SR 120, coal pulverizer run signal 130 and/or manual control signal 140, rest-set flip-flop 202, its S end is connected with reduced-voltage starting button, and R holds the output of Conjunction and disjunction logic functions 201 to connect, time delay module 203, it is input as the output of rest-set flip-flop 202, or logic 204, it is input as the output of time delay module 203 and described output of opening button soon, for exporting enabled instruction 310, impulse generator 205, it is input as the output of rest-set flip-flop 202, if wherein the delay time of time delay module 203 is 300 seconds, the burst length of impulse generator 205 also can be set to 300 seconds, but the present invention is not restricted to this, T module 206, its input is connected with impulse generator 205, is triggered by pulse, when trigger condition is " 1 ", select Y1 to export, when trigger condition is " 0 ", select N1 to export, such as, Y1 is-1MPa, N1 is 0, and wherein N1 switches to the speed of Y1 is 1MPa/min, and the speed that Y1 switches to N1 is 0.25MPa/min, but the present invention is not restricted to this, rate limit blocks 207 and H/L module 208(high lower bound module), for limiting main vapour pressure setting value 311, with avoid main vapour pressure setting value 311 too high or height, "+" module 209, it is input as the output of T module 206 and the output (namely through limited main vapour pressure setting value) of H/L module, for regulating main vapour pressure setting value, and the main vapour pressure setting value after Drazin inverse, PID adjuster 210, it is input as the output of "+" module 209, the output of main vapour pressure actual value 312 and T module 211, for according to through regulate main vapour pressure setting value, the output of main vapour pressure actual value and T module 211 sends boiler master instruction 313, wherein by the output of T module 211 for regulating the time of integration of PID adjuster 210, such as starting from coal pulverizer, the time of integration was become 8000 seconds from 800 seconds, and remain 8000 seconds, until coal pulverizer starts latter 5 minutes, to reduce integral action, this can by being set to 300 seconds realize by the burst length of impulse generator 212, namely coal pulverizer enabling signal trigger generator 212 produces pulse signal, the output that this pulse signal triggers T module 211 switched to 8000 seconds from 800 seconds, after 300 seconds, pulse signal disappears, now, the output of T module 211 switched to 800 seconds from 8000 seconds, so can prevent main vapour pressure from ascending to heaven.Those skilled in the art should understand that above-mentioned components and parts are not intended to limit the present invention, any other suitable components and parts may be used for realizing technical scheme provided by the present invention equally.
Start control procedure below with reference to Fig. 2 and Fig. 3 to the coal pulverizer of above-mentioned preferred embodiment to be described in detail.
Fig. 3 is the flow chart starting control procedure according to the coal pulverizer of a kind of preferred embodiment of the present invention.With reference to figure 3, first, in step 301 place, reduced-voltage starting button 101 sends reduced-voltage starting signal.
In step 302 place, reduced-voltage starting signal by trigger 202 trigger generator 205 to generate a pulse signal.With reference to figure 2, the signal first triggered RS flip-flop 202 of reduced-voltage starting button 101, the signal generated by rest-set flip-flop 202 afterwards carrys out trigger generator 205.Can also draw according to Fig. 2 simultaneously, after reduced-voltage starting signal sends, after the time delay of time delay module 203, carry out startup coal pulverizer again.
In step 303 place, the pulse signal of impulse generator 205 triggers T module 206, by "+" module 209 is sent in the output of T module 206 and the original main vapour pressure setting value limiting 208 through rate limit blocks 207 and H/L module, to draw the main vapour pressure setting value through regulating.Wherein this adjustment can be following process, supposes that the time delay at time delay module 203 place is 5 minutes, after namely reduced-voltage starting button 101 sends reduced-voltage starting order, restarts coal pulverizer through 300 seconds, and the burst length of above-mentioned pulse simultaneously is also 5 minutes; When T module be input as 1 time, its select Y1 to export, such as Y1 value is-1MPa; Normally switch to Y1's by N1, and the speed that N1 switches to Y1 is 1MPa/min, so T module 206 in 1 minute within complete switching from N to Y, in 4 minutes afterwards, due to the existence of pulse signal, T module 206 can keep the output of-1MPa always, reduces by main vapour pressure setting value; Afterwards, pulse signal disappears, so, the input of T module 206 becomes 0, then it exports and starts to be switched by Y-direction N, and now, the time delay of 5 minutes also completes just, coal pulverizer starts, that is, while coal pulverizer starts to start, T module 206 starts to be switched to N1 by Y1, such as switch from-1MPa to 0, and switch speed is now 0.25MPa/min, that is, from-1MPa to 0 switch time be 4 minutes, this represents from startup coal pulverizer, after 4min, the main vapour pressure setting value through reducing can be returned to original main vapour pressure setting value.Those skilled in the art should understand that above-mentioned concrete numerical value is only for exemplary explanation, the present invention is not restricted to this.Described delay time is not must be consistent with the burst length yet, those skilled in the art can by modifying to above-mentioned numerical value, and the switch speed of T module 206 also can carry out different amendments according to actual conditions, can realize technical scheme of the present invention so equally.
In step 304 place, PID adjuster 210 sends boiler master instruction to regulate main vapour pressure.Detailed process is as follows, and from coal pulverizer starts, the main vapour pressure setting value through reducing starts to recover to original main vapour pressure, and the main vapour pressure setting value changed in the meantime is input to PID and regulates in 210; And now, owing to producing coal pulverizer enabling signal, so impulse generator 212 is triggered and generates another pulse, and this pulse-triggered T module 211, so T module 211 starts to export Y2, such as 8000 seconds (N2 is 800 seconds), namely reduces the integral action of PID adjuster 210; PID adjuster 210 sends boiler master instruction according to the output of the main vapour pressure setting value through regulating, main vapour pressure actual value and T module 211, to realize regulating main vapour pressure.Wherein, the burst length of impulse generator 212 can be 5 minutes, namely in these 5 minutes the output of T module 211 to switch to Y2 so that the integral parameter of PID adjuster is remained Y2, and the time that the main vapour pressure setting value through reducing returns to original set value can be 4 minutes (namely the time switched to from T module 206 from Y1 required for N1 is 4 minutes), therefore between main vapour pressure convalescence, T module 211 carrys out the integral parameter of Control PID using Y2 as output, thus prevents ascending to heaven of main vapour pressure further.After five minutes, recover to the original time of integration time of integration.Those skilled in the art should understand that above-mentioned numerical value only for exemplary explanation, the present invention is not restricted to this.Those skilled in the art can by modifying to above-mentioned numerical value, and the switch speed of T module 211 also can carry out different amendments according to actual conditions, can realize technical scheme of the present invention so equally.
In addition, through test of many times, according to actual conditions, corresponding parameter can be selected to realize following effect: the pressure history starting the unit main vapour pressure of the coal pulverizer that coal pulverizer causes according to technical scheme provided by the present invention starts with direct main vapour pressure change curve equal and opposite in direction that coal pulverizer causes and direction is contrary, thus the change that prior art starts the main vapour pressure that coal pulverizer brings can be offset completely, that is, the startup of coal pulverizer is made to have influence on main vapour pressure.Starting influencing characterisitic for pressure and corresponding model to obtain coal pulverizer, to make Prediction Control in the controls and to compensate accordingly, can the impact that the startup of coal pulverizer produces be tested.
In addition, can find out according to Fig. 2, when top button 110 sends quick enabling signal, coal pulverizer can start immediately, thus can meet the situation that need start coal pulverizer immediately.In this case, in order to prevent superpressure, the coal amount reducing coal pulverizer will be controlled.SR 120, coal pulverizer run signal and/or manual control signal can make rest-set flip-flop 202 export 0, from making pulse trigger 205 not production burst, thus make main vapour pressure setting value return to original set value.And SR 120 can also indicate coal pulverizer not start (connection that in Fig. 2, this partial function not shown is corresponding).
And control system provided by the present invention can be operated by man-machine interface.Man-machine interface can be arranged and realize corresponding operational module of the present invention.Such as, reduced-voltage starting choice box can be provided with, to start A coal pulverizer, after click A grinds reduced-voltage starting choice box, the dialog box shown in Fig. 4 can be ejected, then can click A and grind reduced-voltage starting button, to start A coal pulverizer according to above-mentioned start-up course.After click A grinds reduced-voltage starting button, within delay time, if do not want to start A coal pulverizer, can click step-down SR, A coal pulverizer like this can not start, and main vapour pressure setting value returns to original set value simultaneously.In addition, time timing display in man-machine interface, can also be provided with so that operations staff to the entry condition of coal pulverizer and start-up time by accurate assurance.And the operation of other functional modules above-mentioned can also be comprised in man-machine interface, those skilled in the art can realize easily, therefore do not repeat them here.
In the prior art, after coal pulverizer starts, cause main vapour pressure superpressure owing to starting, coordination adjustment is subtracted coal by operations staff, but this makes main vapour pressure even up or reduces, and coal amount needs again to increase in this case.But, due to the large dead time characteristic of pulverized coal preparation system and combustion system, coal amount is increased to play a role needs 5-10 minute, due to the existence of integral action, this is easy to cause boiler superpressure, and this defect can be eliminated by technique scheme provided by the invention, thus avoid the generation of device damage and security incident.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. coal pulverizer starts a control system, and it is characterized in that, described startup control system comprises:
Step down start equipment, for sending the reduced-voltage starting order of coal pulverizer described in reduced-voltage starting; And
Pressure control device, be connected with described step down start equipment, after receiving described reduced-voltage starting order, the unit main vapour pressure initial set value controlling described coal pulverizer reduces a preset value, and start when coal pulverizer starts control through reduce main vapour pressure setting value recover to initial set value, thus the unit pressure change returning to the described coal pulverizer that described initial set value causes after making the unit main vapour pressure initial set value controlling described coal pulverizer reduce described preset value more partially or completely can offset the pressure change starting described coal pulverizer and cause.
2. startup control system according to claim 1, is characterized in that, the main vapour pressure setting value that described pressure control device controls through reducing is recovered to described initial set value according to scheduled rate.
3. startup control system according to claim 1, it is characterized in that, the unit pressure history returning to the described coal pulverizer that described initial set value causes after the unit main vapour pressure initial set value of described coal pulverizer reduces described preset value again with start pressure history equal and opposite in direction that described coal pulverizer causes and direction is contrary.
4. startup control system according to claim 1, is characterized in that, after described step down start equipment sends described reduced-voltage starting order, controls described coal pulverizer and start after Preset Time.
5. startup control system according to claim 4, is characterized in that, described startup control system also comprises device for rapidly starting, after this device for rapidly starting sends quick startup command, starts described coal pulverizer immediately.
6. coal pulverizer starts a control method, and it is characterized in that, described startup control method comprises:
Receive the reduced-voltage starting order of coal pulverizer described in reduced-voltage starting;
The unit main vapour pressure initial set value controlling described coal pulverizer reduces a preset value;
Control described coal pulverizer to start to start, the main vapour pressure setting value simultaneously controlled through reducing is recovered to described initial set value, thus the unit pressure change returning to the described coal pulverizer that described initial set value causes after making the unit main vapour pressure initial set value controlling described coal pulverizer reduce described preset value more partially or completely can offset the pressure change starting described coal pulverizer and cause.
7. startup control method according to claim 6, is characterized in that, the main vapour pressure setting value controlled through reducing is recovered to described initial set value according to scheduled rate.
8. startup control method according to claim 6, it is characterized in that, the unit pressure history returning to the described coal pulverizer that described initial set value causes after the unit main vapour pressure initial set value of described coal pulverizer reduces described preset value again with start pressure history equal and opposite in direction that described coal pulverizer causes and direction is contrary.
9. startup control method according to claim 6, is characterized in that, after receiving described reduced-voltage starting order, controls described coal pulverizer and start after Preset Time.
10. startup control method according to claim 9, is characterized in that, described startup control method starts described coal pulverizer after being also included in and receiving quick startup command immediately.
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Citations (4)
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|---|---|---|---|---|
| CN101487594A (en) * | 2009-02-23 | 2009-07-22 | 东南大学 | Control method for restraining influence of coal mill start/stop to main vapour pressure of boiler |
| CN103185333A (en) * | 2013-05-06 | 2013-07-03 | 安徽省电力科学研究院 | Method for coordinating and controlling quality change of coal in supercritical once-through boiler unit |
| CN103234190A (en) * | 2013-05-13 | 2013-08-07 | 北京和隆优化科技股份有限公司 | Energy-saving optimization control system for chain-grate boiler |
| CN203750677U (en) * | 2013-11-12 | 2014-08-06 | 神华集团有限责任公司 | Coal mill start control system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0762525B2 (en) * | 1982-07-02 | 1995-07-05 | 株式会社日立製作所 | Boiler combustion control device |
| JP3707063B2 (en) * | 1996-07-10 | 2005-10-19 | 石川島播磨重工業株式会社 | Control method of vertical mill during main steam pressure control |
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2013
- 2013-11-12 CN CN201310560440.8A patent/CN103567052B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487594A (en) * | 2009-02-23 | 2009-07-22 | 东南大学 | Control method for restraining influence of coal mill start/stop to main vapour pressure of boiler |
| CN103185333A (en) * | 2013-05-06 | 2013-07-03 | 安徽省电力科学研究院 | Method for coordinating and controlling quality change of coal in supercritical once-through boiler unit |
| CN103234190A (en) * | 2013-05-13 | 2013-08-07 | 北京和隆优化科技股份有限公司 | Energy-saving optimization control system for chain-grate boiler |
| CN203750677U (en) * | 2013-11-12 | 2014-08-06 | 神华集团有限责任公司 | Coal mill start control system |
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Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee after: CHINA ENERGY INVESTMENT Corp.,Ltd. Patentee after: State energy group Guoyuan Electric Power Co.,Ltd. Patentee after: SHAANXI DEYUAN FUGU ENERGY Co.,Ltd. Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee before: SHENHUA GROUP Corp.,Ltd. Patentee before: SHENHUA GUONENG ENERGY GROUP Corp.,Ltd. Patentee before: SHAANXI DEYUAN FUGU ENERGY Co.,Ltd. |
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