CN103721833A - Linkage control method, linkage control system and linkage control device for inlet air pressure and capacity air volume of coal mill - Google Patents
Linkage control method, linkage control system and linkage control device for inlet air pressure and capacity air volume of coal mill Download PDFInfo
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Abstract
The invention discloses a linkage control method, a linkage control system and a linkage control device for the inlet air pressure and the capacity air volume of a coal mill. The method comprises the following steps: obtaining an input value of a capacity air door of the coal mill; comparing the input value of the capacity air door with upper and lower threshold values of a preset input value of the capacity air door; obtaining a hot air pressure and capacity air volume linkage triggering direction instruction; obtaining the dynamic value of an inlet air pressure setting value offset through combination with preset inlet air pressure setting offset target values and inlet air pressure setting value offset change rates; integrating a preset inlet air pressure setting value with the dynamic value of the inlet air pressure setting value offset to obtain inlet air pressure control quantity; controlling the inlet air pressure of the coal mill to enable the opening degree of the capacity air door of the coal mill to be adjusted in an adjustable linear region. According to combination with a coupling relationship between the inlet air pressure and the capacity air of the coal mill, the inlet primary air pressure and the capacity air volume linkage conditions of the coal mill are controlled and adjusted, the integral saturation phenomenon easily caused by a capacity air control loop can be inhibited, and the controllability and the adjustment quality of the full-load range of the capacity air door are effectively improved.
Description
Technical field
The present invention relates to coal pulverizer technical field, particularly relate to coal pulverizer inlet blast and capacity air quantity inter-linked controlling method, system and device.
Background technology
Due to domestic firepower, to send out the coal that unit uses changeable, and configuration double inlet and outlet coal mill is more and more general.But effective aperture scope of the capacity air door of coal pulverizer is narrower, when air door reaches the upper limit (or lower limit) of effective aperture, there is integration saturated phenomenon.Now, during the increase of boiler and fuel master control (or minimizing), capacity air quantity is actual cannot be responded.Directly have influence on the regulation quality of boiler combustion control system.
Summary of the invention
Based on this, be necessary cannot truly, accurately respond for the control method of capacity air quantity in double inlet and outlet coal mill the increase (or minimizing) of boiler and fuel master control, the problem of adversely affecting its combustion normal operation of boiler, a kind of coal pulverizer inlet blast and capacity air quantity inter-linked controlling method, system and device of the increase (or minimizing) that can truly, accurately respond boiler and fuel master control are provided, guarantee the normal work of burning boiler and safe operation.
A kind of coal pulverizer inlet blast and capacity air quantity inter-linked controlling method, comprise step:
Obtain coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction;
According to described hot-blast pressure and the interlock of capacity air quantity, trigger direction instruction, preset desired value collection and default coal pulverizer inlet blast setting value offset change rate set that the setting of coal pulverizer inlet blast is setovered, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, and described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed;
The dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtain coal pulverizer inlet blast controlled quentity controlled variable;
According to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
A kind of coal pulverizer inlet blast and capacity air quantity coordinated control system, comprising:
Hot-blast pressure and the interlock of capacity air quantity trigger direction instruction generation module, be used for obtaining coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction;
The dynamic value acquisition module of blast setting value amount of bias, for triggering direction instruction according to described hot-blast pressure and the interlock of capacity air quantity, default coal pulverizer inlet blast is set desired value collection and the default coal pulverizer inlet blast setting value offset change rate set of biasing, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed,
Entrance blast controlled quentity controlled variable control module, for the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtains coal pulverizer inlet blast controlled quentity controlled variable;
Control module, for according to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
A kind of coal pulverizer inlet blast and capacity air quantity linkage control device, comprise the linkage command trigger module, linkage management policy module and the interlock enforcement control module that connect successively;
Described linkage command trigger module receives the instruction of capacity air door, obtain coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction, send hot-blast pressure and the instruction of capacity air quantity interlock triggering direction to described linkage management policy module;
Described linkage management policy module receives described hot-blast pressure and the interlock of capacity air quantity triggers direction instruction, and trigger direction instruction according to described hot-blast pressure and the interlock of capacity air quantity, default coal pulverizer inlet blast is set desired value collection and the default coal pulverizer inlet blast setting value offset change rate set of biasing, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed, the dynamic value that sends described coal pulverizer inlet blast setting value amount of bias is implemented control module to described interlock,
Described interlock enforcement control module receives the dynamic value of described coal pulverizer inlet blast setting value amount of bias, and the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtain coal pulverizer inlet blast controlled quentity controlled variable, according to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
Coal pulverizer inlet blast of the present invention and capacity air quantity inter-linked controlling method, system and device, theoretical foundation is: the capacity air quantity in coal pulverizer is relevant with the aperture of capacity air door, also there is direct relation with the primary air pressure that enters coal pulverizer simultaneously, the aperture of same capacity air door, when primary air pressure is larger, capacity wind is larger, under the regulating action of capacity air door, the aperture of capacity air door is decreased to certain position gradually, departs from upper limit region, has exited integration saturation region.Otherwise, as the same.Thereby, in actual Control System Design, when combustion control system is during because of capacity throttle opening limitation reason generation integration saturated phenomenon, can link by wind control system of coal pulverizer inlet, improve or reduce coal pulverizer inlet blast, thereby making the regulating command of air door again within effective restriction.Specifically, whole scheme comprises obtains coal pulverizer capacity air door input value, the upper-lower door limit value of comparison coal pulverizer capacity air door input value and default coal pulverizer capacity air door input value, obtain hot-blast pressure and the instruction of capacity air quantity interlock triggering direction, in conjunction with default entrance blast, set again afterwards desired value and the entrance blast setting value offset change speed of biasing, obtain the dynamic value of coal machine entrance blast setting value amount of bias, the dynamic value of integrating default entrance blast setting value and entrance blast setting value amount of bias obtains entrance blast controlled quentity controlled variable, control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.Whole process, catch the coupled relation between coal pulverizer inlet blast and capacity wind, coal pulverizer inlet primary air pressure and capacity air quantity interlock condition control adjustment have been implemented, can suppress the incident integration saturated phenomenon of capacity wind control loop, effectively improve controllability and the regulation quality of the full load scope of capacity air door.Can true and accurate the increase (or minimizing) of response boiler and fuel master control, guarantee that burning boiler normally works and safe operation.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of coal pulverizer inlet blast of the present invention and first embodiment of capacity air quantity inter-linked controlling method;
Fig. 2 is the schematic flow sheet of coal pulverizer inlet blast of the present invention and second embodiment of capacity air quantity inter-linked controlling method;
Fig. 3 is the structural representation of coal pulverizer inlet blast of the present invention and first embodiment of capacity air quantity coordinated control system;
Fig. 4 is the structural representation of coal pulverizer inlet blast of the present invention and second embodiment of capacity air quantity coordinated control system;
Fig. 5 is the structural representation of coal pulverizer inlet blast of the present invention and first embodiment of capacity air quantity linkage control device;
Fig. 6 is the structural representation of coal pulverizer inlet blast of the present invention and second embodiment of capacity air quantity linkage control device;
Fig. 7 is coal pulverizer inlet blast of the present invention and capacity air quantity linkage control device coal pulverizer inlet blast and capacity air quantity interlock control strategy logical schematic in a specific embodiment therein.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawings and embodiment, the present invention is further elaborated.Should be appreciated that concrete enforcement described herein, only in order to explain the present invention, does not limit the present invention.
Coal pulverizer inlet blast of the present invention with the core theory foundation of capacity air quantity inter-linked controlling method, system and device is: the capacity air quantity in coal pulverizer is relevant with the aperture of capacity air door, also there is direct relation with the primary air pressure that enters coal pulverizer simultaneously, the aperture of same capacity air door, when primary air pressure larger, capacity wind is larger, and under the regulating action of capacity air door, the aperture of capacity air door is decreased to certain position gradually, depart from upper limit region, exited integration saturation region.Otherwise, as the same.Thereby, in actual Control System Design, when combustion control system is during because of capacity throttle opening limitation reason generation integration saturated phenomenon, can link by wind control system of coal pulverizer inlet, improve or reduce coal pulverizer inlet blast, thereby making the regulating command of air door again within effective restriction.
As shown in Figure 1, a kind of coal pulverizer inlet blast and capacity air quantity inter-linked controlling method, comprise step:
S200: obtain coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction.
Coal pulverizer capacity air door input value can adopt conventional means to measure by hardware devices such as sensor and processors, and default coal pulverizer capacity air door input value can optionally set in advance.Here the hot-blast pressure of saying and the interlock of capacity air quantity trigger direction instruction, in simple terms, are that one can be also low level triggering command for high level, and different triggering command can be chosen different numerical value and carry out calculating operation in subsequent step.。
S400: trigger direction instruction according to described hot-blast pressure and the interlock of capacity air quantity, default coal pulverizer inlet blast is set desired value collection and the default coal pulverizer inlet blast setting value offset change rate set of biasing, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed.
Default coal pulverizer inlet blast is set the desired value of biasing and is concentrated the desired value that includes multiple default coal pulverizer inlet blast setting biasings, in default coal pulverizer inlet blast setting value offset change rate set, comprise multiple default coal pulverizer inlet blast setting value offset change speed, these numerical value are all constant numerical value, can set according to current application situation, the number of numerical value also can be set according to demand.Different hot-blast pressures triggers direction instruction or chooses different numerical value in these set of values from the interlock of capacity air quantity, then the numerical value of choosing according to these obtains the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias.In simple terms, what the desired value of coal pulverizer inlet blast setting biasing determined is a upper-lower door limit value, and coal pulverizer inlet blast setting value offset change speed determines, be the speed of numerical value change in this reaches the standard grade threshold value interval, according to these two values, just can obtain coal pulverizer inlet blast and set value the dynamic value of amount of bias.
S600: the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtain coal pulverizer inlet blast controlled quentity controlled variable.
Default coal pulverizer inlet blast setting value pre-sets, and the addition that this integration process can be understood as two data obtains coal pulverizer inlet blast controlled quentity controlled variable.
S800: according to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
Coal pulverizer inlet blast of the present invention and capacity air quantity inter-linked controlling method, obtain coal pulverizer capacity air door input value, the upper-lower door limit value of comparison coal pulverizer capacity air door input value and default coal pulverizer capacity air door input value, obtain hot-blast pressure and the instruction of capacity air quantity interlock triggering direction, in conjunction with default entrance blast, set again afterwards desired value and the entrance blast setting value offset change speed of biasing, obtain the dynamic value of coal machine entrance blast setting value amount of bias, the dynamic value of integrating default entrance blast setting value and entrance blast setting value amount of bias obtains entrance blast controlled quentity controlled variable, control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.Whole process, catch the coupled relation between coal pulverizer inlet blast and capacity wind, coal pulverizer inlet primary air pressure and capacity air quantity interlock condition control adjustment have been implemented, can suppress the incident integration saturated phenomenon of capacity wind control loop, effectively improve controllability and the regulation quality of the full load scope of capacity air door.Can true and accurate the increase (or minimizing) of response boiler and fuel master control, guarantee that burning boiler normally works and safe operation.In addition, universality is strong, configuration is convenient, without adopting computer programming method to realize, utilizes existing functional block in current DCS system configuration software to realize, and readable strong, facilitates the multiplexing of control strategy and algorithm logic.
As shown in Figure 2, therein in an embodiment, before described step S800 also in steps:
S720: obtain the primary air pressure of fan outlet in the heat primary air main-piping pressure of coal pulverizer and coal pulverizer, calculate the difference of the primary air pressure of fan outlet in the heat primary air main-piping pressure of described coal pulverizer and described coal pulverizer, obtain blast difference;
S740: judge whether described coal pulverizer inlet blast controlled quentity controlled variable exceedes default blast control threshold value, if exceed, hot-blast pressure and capacity air quantity interlock inefficacy are described, abandon data terminating operation, if do not exceed, according to described blast difference, regulate exerting oneself of the pulverized coal preparation system that is connected with coal pulverizer.
Being originally in embodiment, increase the step of Failure Alarm, after blast difference between the primary air pressure that has obtained fan outlet in the heat primary air main-piping pressure of coal pulverizer and described coal pulverizer, judge whether coal pulverizer inlet blast controlled quentity controlled variable exceedes default blast control threshold value, if exceeded, just illustrate that this hot-blast pressure and capacity air quantity link unsuccessfully, abandon these data and warning terminating operation, if just do not exceeded according to this blast difference, regulate exerting oneself of the pulverized coal preparation system that is connected with coal pulverizer.
As shown in Figure 2, in an embodiment, described step S400 specifically comprises step therein:
S420: determine that default coal pulverizer inlet blast is set the desired value collection of biasing and default coal pulverizer inlet blast sets value offset change rate set;
S440: interlock triggers direction instruction and default coal pulverizer inlet blast and set the desired value collection of biasing according to described hot-blast pressure and capacity air quantity, determines current coal pulverizer inlet blast amount of bias;
S460: interlock triggers direction instruction and default coal pulverizer inlet blast setting value offset change rate set according to described hot-blast pressure and capacity air quantity, determines current coal pulverizer inlet blast setting value offset change speed;
S480: when described coal pulverizer inlet blast amount of bias changes, according to current coal pulverizer inlet blast amount of bias and current coal pulverizer inlet blast setting value offset change speed, obtain the dynamic value of the coal pulverizer inlet blast setting value amount of bias of current time.
In the present embodiment, when coal pulverizer inlet blast amount of bias changes, coal pulverizer inlet blast amount of bias changes the rate of change according to certain, the dynamic value that finally obtains the coal pulverizer inlet blast setting value amount of bias of current time, is conducive to so whole linkage process numerical value change and tends towards stability.
As shown in Figure 3, a kind of coal pulverizer inlet blast and capacity air quantity coordinated control system, comprising:
Hot-blast pressure and the interlock of capacity air quantity trigger direction instruction generation module 100, be used for obtaining coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction;
The dynamic value acquisition module 200 of blast setting value amount of bias, for triggering direction instruction according to described hot-blast pressure and the interlock of capacity air quantity, default coal pulverizer inlet blast is set desired value collection and the default coal pulverizer inlet blast setting value offset change rate set of biasing, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed,
Entrance blast controlled quentity controlled variable control module 300, for the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtains coal pulverizer inlet blast controlled quentity controlled variable;
Coal pulverizer inlet blast of the present invention and capacity air quantity coordinated control system, hot-blast pressure and the interlock of capacity air quantity trigger direction instruction generation module 100 and obtain coal pulverizer capacity air door input value, the upper-lower door limit value of comparison coal pulverizer capacity air door input value and default coal pulverizer capacity air door input value, obtain hot-blast pressure and the instruction of capacity air quantity interlock triggering direction, the dynamic value acquisition module 200 of blast setting value amount of bias is set desired value and the entrance blast setting value offset change speed of biasing in conjunction with default entrance blast, obtain the dynamic value of coal machine entrance blast setting value amount of bias, the dynamic value that entrance blast controlled quentity controlled variable control module 300 is integrated default entrance blast setting value and entrance blast setting value amount of bias obtains entrance blast controlled quentity controlled variable, control module 400 is according to entrance blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.Whole process, catch the coupled relation between coal pulverizer inlet blast and capacity wind, coal pulverizer inlet primary air pressure and capacity air quantity interlock condition control adjustment have been implemented, can suppress the incident integration saturated phenomenon of capacity wind control loop, effectively improve controllability and the regulation quality of the full load scope of capacity air door.Can true and accurate the increase (or minimizing) of response boiler and fuel master control, guarantee that burning boiler normally works and safe operation.In addition, whole system universality is strong, configuration convenient, without adopting computer programming method to realize, utilizes existing functional block in current DCS system configuration software to realize, and readable strong, facilitates the multiplexing of control strategy and algorithm logic.
As shown in Figure 4, in an embodiment, described coal pulverizer inlet blast and capacity air quantity coordinated control system, also comprise therein:
Blast difference acquisition module 500, for obtaining the heat primary air main-piping pressure of coal pulverizer and the primary air pressure of coal pulverizer fan outlet, calculate the difference of the primary air pressure of fan outlet in the heat primary air main-piping pressure of described coal pulverizer and described coal pulverizer, obtain blast difference;
As shown in Figure 4, in an embodiment, the dynamic value acquisition module 200 of described blast setting value amount of bias specifically comprises therein:
Preset value determining unit 220, for determining that default coal pulverizer inlet blast is set the desired value collection of biasing and default coal pulverizer inlet blast sets value offset change rate set;
Coal pulverizer inlet blast amount of bias determining unit 240, for interlock triggers direction instruction and default coal pulverizer inlet blast and set the desired value collection of biasing according to described hot-blast pressure and capacity air quantity, determines current coal pulverizer inlet blast amount of bias;
Coal pulverizer inlet blast setting value offset change rate determination unit 260, according to described hot-blast pressure and capacity air quantity, interlock triggers direction instruction and default coal pulverizer inlet blast setting value offset change rate set, determines current coal pulverizer inlet blast setting value offset change speed;
The dynamic value acquiring unit 280 of entrance blast setting value amount of bias, for when described coal pulverizer inlet blast amount of bias changes, according to current coal pulverizer inlet blast amount of bias and current coal pulverizer inlet blast setting value offset change speed, obtain the dynamic value of the coal pulverizer inlet blast setting value amount of bias of current time.
As shown in Figure 5, a kind of coal pulverizer inlet blast and capacity air quantity linkage control device, comprise the linkage command trigger module 510, linkage management policy module 520 and the interlock enforcement control module 530 that connect successively;
Described linkage command trigger module 510 receives the instruction of capacity air door, obtain coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction, send hot-blast pressure and the instruction of capacity air quantity interlock triggering direction to described linkage management policy module 520;
Described linkage management policy module 520 receives described hot-blast pressure and the interlock of capacity air quantity triggers direction instruction, and trigger direction instruction according to described hot-blast pressure and the interlock of capacity air quantity, default coal pulverizer inlet blast is set desired value collection and the default coal pulverizer inlet blast setting value offset change rate set of biasing, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed, the dynamic value that sends described coal pulverizer inlet blast setting value amount of bias is implemented control module 530 to described interlock,
Described interlock enforcement control module 530 receives the dynamic value of described coal pulverizer inlet blast setting value amount of bias, and the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtain coal pulverizer inlet blast controlled quentity controlled variable, according to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
Coal pulverizer inlet blast of the present invention and capacity air quantity linkage control device, catch the coupled relation between coal pulverizer inlet blast and capacity wind, coal pulverizer inlet primary air pressure and capacity air quantity interlock condition control adjustment have been implemented, can suppress the incident integration saturated phenomenon of capacity wind control loop, effectively improve controllability and the regulation quality of the full load scope of capacity air door.Can true and accurate the increase (or minimizing) of response boiler and fuel master control, guarantee that burning boiler normally works and safe operation.In addition, whole system universality is strong, configuration convenient, without adopting computer programming method to realize, utilizes existing functional block in current DCS system configuration software to realize, and readable strong, facilitates the multiplexing of control strategy and algorithm logic.
As shown in Figure 6, in an embodiment, described coal pulverizer inlet blast and capacity air quantity linkage control device, also comprise interlock Failure Alarm administration module 540 therein;
Described interlock Failure Alarm administration module 540 reads coal pulverizer inlet blast controlled quentity controlled variable, the difference of the primary air pressure of fan outlet in the heat primary air main-piping pressure of calculating coal pulverizer and coal pulverizer, obtain blast difference, judge whether described coal pulverizer inlet blast controlled quentity controlled variable exceedes default blast control threshold value, if exceed, hot-blast pressure and capacity air quantity interlock inefficacy are described, abandon data and report to the police, if do not exceed, according to described blast difference, regulate exerting oneself of the pulverized coal preparation system that is connected with coal pulverizer.
In the present embodiment, be provided with interlock Failure Alarm administration module 540, can carry out a check to the linkage process of whole coal pulverizer inlet blast and capacity air quantity linkage control device, judge whether interlock lost efficacy, if lose efficacy, reported to the police and abandoned data, if do not lose efficacy according to the difference of the primary air pressure of fan outlet in heat primary air main-piping pressure and coal pulverizer, exerting oneself of the pulverized coal preparation system that adjusting is connected with coal pulverizer, guarantees whole coal pulverizer inlet blast and the work of capacity air quantity linkage control device efficiently and accurately.
As shown in Figure 6, therein in an embodiment, described linkage management policy module 520 comprises first signal switch unit 522, secondary signal switch unit 524 and signal rate limiting unit 526, described first signal switch unit 522 and described secondary signal switch unit 524 are respectively arranged with multiple pins, the pin of described first signal switch unit 522 is preset with multiple different coal pulverizer inlet blast and sets the desired value of setovering, and the pin of described secondary signal switch unit 524 is preset with multiple different coal pulverizer inlet blast setting value offset change speed;
The control end of the control end of described first signal switch unit 522 and described secondary signal switch unit 524 is connected with described linkage command trigger module respectively, the output of described first signal switch unit 522 is connected with the value input of described signal rate limiting unit 526, the output of described secondary signal switch unit 524 is connected with the volume speed input of described signal rate limiting unit 526, and the output of described signal rate limiting unit 526 is implemented control module with described interlock and is connected;
Hot-blast pressure and the interlock of capacity air quantity that described first signal switch unit 522 receives described linkage command trigger module output trigger direction instruction, according to described hot-blast pressure and the interlock of capacity air quantity, trigger direction instruction, choose different pin values and as coal pulverizer inlet blast, set the desired value of biasing, send described coal pulverizer inlet blast and set the desired value of setovering to described signal rate limiting unit 526, described secondary signal is switched the hot-blast pressure and the instruction of capacity air quantity interlock triggering direction that receive described linkage command trigger module output, according to described hot-blast pressure and the interlock of capacity air quantity, trigger direction instruction, choose different pin values as coal pulverizer inlet blast setting value offset change speed, send described coal pulverizer inlet blast setting value offset change speed to described signal rate limiting unit 526, when described coal pulverizer inlet blast amount of bias changes, described signal rate limiting unit 526 is according to current coal pulverizer inlet blast amount of bias and current coal pulverizer inlet blast setting value offset change speed, the dynamic value of the coal pulverizer inlet blast setting value amount of bias of output current time.
Signal rate limiting unit is realized output valve and is changed according to given pace, and when input and output are worth when inconsistent, output valve will level off to input value according to given speed.The linkage process that makes of this functional block tends towards stability.
In order further to explain in detail the practical application of wind pressure of the present invention and capacity air quantity inter-linked controlling method and system and know-why and the beneficial effect thereof of wind pressure of the present invention and capacity air quantity linkage control device, below employing one specific embodiment is explained in conjunction with Fig. 7.
As shown in Figure 7, Fig. 7 is coal pulverizer inlet blast and capacity air quantity interlock control strategy logical schematic.
Linkage command trigger module 510 comprises bound warning function piece 511, " logic OR " functional block 512 with stagnant ring:
Bound warning function piece 511 realizes that input quantity exceedes certain value or lower than after certain value, this functional module is reported to the police and is logical one at corresponding output pin superset high level.When input value is when being less than lower limit and changing to the upper limit, only have when input value is greater than lower limit and adds corresponding stagnant ring value, the pin that lower limit is reported to the police just can be put logical zero.In like manner, when input value is when being greater than higher limit to lower limit variation, only have when input value is less than the upper limit and deducts corresponding stagnant ring value, the pin of upper limit alarm just can be put logical zero.Bound and stagnant ring definite value can be according to concrete condition settings.When capacity throttle opening is greater than or less than after certain value, send the interlock signal of different directions.
" logic OR " functional module 512 is that the output of above-mentioned bound warning function piece is caused to this module input pin, adopts " logic OR " computing to be exported accordingly (logical zero or " 1 ").When the arbitrary pin of 511 warning function piece sends logical one, true (logical one) put in functional module 512 outputs.
Linkage management policy module 520, calculates the dynamic value of the setting value biasing of coal pulverizer inlet blast control loop, and exports in coal pulverizer inlet blast control loop according to certain speed according to interlock trigger condition.Include 4 constant function pieces 521,522,524,525, signal handoff functionality,, 523,526 and numerical signal rate of change limit value functional block 525:
First constant block 521 values of putting are 10, as the input value of first signal handoff functionality piece 523 " Y " pin.Second constant block 522 values of putting are-10, as the input value of first signal handoff functionality piece 523 " N " pin.Three constant piece 524 values of putting are 0.1, as the input value of secondary signal handoff functionality piece 526 " Y " pin.The 4th constant block 525 values of putting are 0.0, as the input value of secondary signal handoff functionality piece 526 " N " pin;
Secondary signal handover module 526 refers to selects the output of different pin input values as this functional block under different conditions, and the output valve of handover module is as the target of linkage process entrance blast pressure setting biasing.When 522 are output as 1, secondary signal handoff functionality piece 526 selects the numerical value of three constant piece 524 as output, is output as 0.1; Otherwise secondary signal handoff functionality piece 526 selects the numerical value of the 4th constant 525 as output, is output as 0.
Signal rate limitation function piece 525 changes according to given pace for realizing output valve.When input and output are worth when inconsistent, output valve will level off to input value according to given speed.The linkage process that makes of this functional block tends towards stability.This medium-rate size is served as by functional block 526 outputs, and export target value is served as by the output valve of functional block 523.
Implement control module 530, for calculating interlock control procedure coal pulverizer inlet blast setting value, then send in corresponding controller.That is, by improving or reduce the entrance blast of coal pulverizer, affect the aperture of capacity air door, make capacity air door complete regulatory function at adjustable linear zone.Comprise numerical value addition function piece 531: numerical value addition function piece realize two inputs between numerical value and.Original coal pulverizer inlet blast set value basic on stack interlock make the amount of bias producing.
Interlock Failure Alarm administration module 540, for judging that interlock controls disabler, and sends command adapted thereto and warning reminding operations staff and increases pulverized coal preparation system and exert oneself.Comprise constant function piece 541, numerical value subtraction block 542 and upper limit alarm module 543:
Numerical value subtraction function piece 542 is realized two differences between input numerical value, and the data of input have dividing of strict subtrahend and minuend.Wherein, pin "-" connects subtrahend, and pin "+" connects minuend.The primary air pressure of minuend connecting fan outlet, subtrahend is constant 0.4;
Upper limit alarm functional block 543 realizes input quantity and exceedes after certain value, and this functional module is reported to the police and is logical one at output pin superset high level.When input value is less than higher limit, reports to the police and disappear and put logical zero at output pin.Upper limit value is introduced by the output valve of subtraction block, and reminds operations staff to carry out associative operation.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. coal pulverizer inlet blast and a capacity air quantity inter-linked controlling method, is characterized in that, comprises step:
Obtain coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction;
According to described hot-blast pressure and the interlock of capacity air quantity, trigger direction instruction, preset desired value collection and default coal pulverizer inlet blast setting value offset change rate set that the setting of coal pulverizer inlet blast is setovered, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, and described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed;
The dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtain coal pulverizer inlet blast controlled quentity controlled variable;
According to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
2. coal pulverizer inlet blast according to claim 1 and capacity air quantity inter-linked controlling method, it is characterized in that, described according to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast so that the aperture of coal pulverizer capacity air door before regulating in adjustable linear zone also in steps:
Obtain the primary air pressure of fan outlet in the heat primary air main-piping pressure of coal pulverizer and coal pulverizer, calculate the difference of the primary air pressure of fan outlet in the heat primary air main-piping pressure of described coal pulverizer and described coal pulverizer, obtain blast difference;
Judge whether described coal pulverizer inlet blast controlled quentity controlled variable exceedes default blast control threshold value, if exceed, hot-blast pressure and capacity air quantity interlock inefficacy are described, abandon data terminating operation, if do not exceed, according to described blast difference, regulate exerting oneself of the pulverized coal preparation system that is connected with coal pulverizer.
3. coal pulverizer inlet blast according to claim 1 and 2 and capacity air quantity inter-linked controlling method, it is characterized in that, described according to described hot-blast pressure and capacity air quantity, interlock triggers direction instruction, default coal pulverizer inlet blast and sets desired value and the default coal pulverizer inlet blast setting value offset change speed of biasing, and the dynamic value of obtaining corresponding coal pulverizer inlet blast setting value amount of bias specifically comprises step:
Determine that default coal pulverizer inlet blast is set the desired value collection of biasing and default coal pulverizer inlet blast sets value offset change rate set;
According to described hot-blast pressure and capacity air quantity, interlock triggers direction instruction and default coal pulverizer inlet blast and sets the desired value collection of biasing, determines current coal pulverizer inlet blast amount of bias;
According to described hot-blast pressure and capacity air quantity, interlock triggers direction instruction and default coal pulverizer inlet blast setting value offset change rate set, determines current coal pulverizer inlet blast setting value offset change speed;
When described coal pulverizer inlet blast amount of bias changes, according to current coal pulverizer inlet blast amount of bias and current coal pulverizer inlet blast setting value offset change speed, obtain the dynamic value of the coal pulverizer inlet blast setting value amount of bias of current time.
4. coal pulverizer inlet blast and a capacity air quantity coordinated control system, is characterized in that, comprising:
Hot-blast pressure and the interlock of capacity air quantity trigger direction instruction generation module, be used for obtaining coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction;
The dynamic value acquisition module of blast setting value amount of bias, for triggering direction instruction according to described hot-blast pressure and the interlock of capacity air quantity, default coal pulverizer inlet blast is set desired value collection and the default coal pulverizer inlet blast setting value offset change rate set of biasing, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed,
Entrance blast controlled quentity controlled variable control module, for the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtains coal pulverizer inlet blast controlled quentity controlled variable;
Control module, for according to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
5. coal pulverizer inlet blast according to claim 4 and capacity air quantity coordinated control system, is characterized in that, also comprises:
Blast difference acquisition module, for obtaining the heat primary air main-piping pressure of coal pulverizer and the primary air pressure of coal pulverizer fan outlet, calculate the difference of the primary air pressure of fan outlet in the heat primary air main-piping pressure of described coal pulverizer and described coal pulverizer, obtain blast difference;
Judge module, be used for judging whether described coal pulverizer inlet blast controlled quentity controlled variable exceedes default blast control threshold value, if exceed, hot-blast pressure and capacity air quantity interlock inefficacy are described, abandon data terminating operation, if do not exceed, according to described blast difference, regulate exerting oneself of the pulverized coal preparation system that is connected with coal pulverizer.
6. according to the coal pulverizer inlet blast described in claim 4 or 5 and capacity air quantity coordinated control system, it is characterized in that, the dynamic value acquisition module of described blast setting value amount of bias specifically comprises:
Preset value determining unit, for determining that default coal pulverizer inlet blast is set the desired value collection of biasing and default coal pulverizer inlet blast sets value offset change rate set;
Coal pulverizer inlet blast amount of bias determining unit, for interlock triggers direction instruction and default coal pulverizer inlet blast and set the desired value collection of biasing according to described hot-blast pressure and capacity air quantity, determines current coal pulverizer inlet blast amount of bias;
Coal pulverizer inlet blast setting value offset change rate determination unit, according to described hot-blast pressure and capacity air quantity, interlock triggers direction instruction and default coal pulverizer inlet blast setting value offset change rate set, determines current coal pulverizer inlet blast setting value offset change speed;
The dynamic value acquiring unit of entrance blast setting value amount of bias, for when described coal pulverizer inlet blast amount of bias changes, according to current coal pulverizer inlet blast amount of bias and current coal pulverizer inlet blast setting value offset change speed, obtain the dynamic value of the coal pulverizer inlet blast setting value amount of bias of current time.
7. coal pulverizer inlet blast and a capacity air quantity linkage control device, its characteristic value is, comprises the linkage command trigger module, linkage management policy module and the interlock enforcement control module that connect successively;
Described linkage command trigger module receives the instruction of capacity air door, obtain coal pulverizer capacity air door input value, compare respectively the higher limit of coal pulverizer capacity air door input value and the higher limit of default coal pulverizer capacity air door input value, and the lower limit of the lower limit of capacity air door input value and default coal pulverizer capacity air door input value, obtain comparison result, according to described comparison result Heat of Formation wind pressure and the interlock of capacity air quantity, trigger direction instruction, send hot-blast pressure and the instruction of capacity air quantity interlock triggering direction to described linkage management policy module;
Described linkage management policy module receives described hot-blast pressure and the interlock of capacity air quantity triggers direction instruction, and trigger direction instruction according to described hot-blast pressure and the interlock of capacity air quantity, default coal pulverizer inlet blast is set desired value collection and the default coal pulverizer inlet blast setting value offset change rate set of biasing, obtain the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias, wherein, the desired value collection that described default coal pulverizer inlet blast is set biasing comprises the desired value of multiple default coal pulverizer inlet blast setting biasings, described default coal pulverizer inlet blast setting value offset change rate set comprises multiple default coal pulverizer inlet blast setting value offset change speed, the dynamic value that sends described coal pulverizer inlet blast setting value amount of bias is implemented control module to described interlock,
Described interlock enforcement control module receives the dynamic value of described coal pulverizer inlet blast setting value amount of bias, and the dynamic value of corresponding coal pulverizer inlet blast setting value amount of bias and default coal pulverizer inlet blast are set value to integration, obtain coal pulverizer inlet blast controlled quentity controlled variable, according to described coal pulverizer inlet blast controlled quentity controlled variable control coal pulverizer inlet blast, so that the aperture of coal pulverizer capacity air door regulates in adjustable linear zone.
8. coal pulverizer inlet blast according to claim 7 and capacity air quantity linkage control device, its characteristic value is, also comprises interlock Failure Alarm administration module;
Described interlock Failure Alarm administration module reads coal pulverizer inlet blast controlled quentity controlled variable, the difference of the primary air pressure of fan outlet in the heat primary air main-piping pressure of calculating coal pulverizer and coal pulverizer, obtain blast difference, judge whether described coal pulverizer inlet blast controlled quentity controlled variable exceedes default blast control threshold value, if exceed, hot-blast pressure and capacity air quantity interlock inefficacy are described, abandon data and report to the police, if do not exceed, according to described blast difference, regulate exerting oneself of the pulverized coal preparation system that is connected with coal pulverizer.
9. according to the coal pulverizer inlet blast described in right 7 or 8 and capacity air quantity linkage control device, its characteristic value is, described linkage management policy module comprises first signal switch unit, secondary signal switch unit and signal rate limiting unit, described first signal switch unit and described secondary signal switch unit are respectively arranged with multiple pins, the pin of described first signal switch unit is preset with multiple different coal pulverizer inlet blast and sets the desired value of setovering, the pin of described secondary signal switch unit is preset with multiple different coal pulverizer inlet blast setting value offset change speed,
The control end of the control end of described first signal switch unit and described secondary signal switch unit is connected with described linkage command trigger module respectively, the output of described first signal switch unit is connected with the value input of described signal rate limiting unit, the output of described secondary signal switch unit is connected with the volume speed input of described signal rate limiting unit, and the output of described signal rate limiting unit is implemented control module with described interlock and is connected;
Hot-blast pressure and the interlock of capacity air quantity that described first signal switch unit receives described linkage command trigger module output trigger direction instruction, according to described hot-blast pressure and the interlock of capacity air quantity, trigger direction instruction, choose different pin values and as coal pulverizer inlet blast, set the desired value of biasing, send described coal pulverizer inlet blast and set the desired value of setovering to described signal rate limiting unit, described secondary signal is switched the hot-blast pressure and the instruction of capacity air quantity interlock triggering direction that receive described linkage command trigger module output, according to described hot-blast pressure and the interlock of capacity air quantity, trigger direction instruction, choose different pin values as coal pulverizer inlet blast setting value offset change speed, send described coal pulverizer inlet blast setting value offset change speed to described signal rate limiting unit, when described coal pulverizer inlet blast amount of bias changes, described signal rate limiting unit is according to current coal pulverizer inlet blast amount of bias and current coal pulverizer inlet blast setting value offset change speed, the dynamic value of the coal pulverizer inlet blast setting value amount of bias of output current time.
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| CN104646167A (en) * | 2015-01-20 | 2015-05-27 | 浙江大学 | Primary air pressure self-adaptive control method |
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| CN113578508A (en) * | 2021-07-14 | 2021-11-02 | 河北西柏坡发电有限责任公司 | Logic optimization method, device and system for protecting air volume at inlet of coal mill |
| CN113634355B (en) * | 2021-08-11 | 2022-10-14 | 内蒙古京隆发电有限责任公司 | Coal mill coal blockage fault judgment and fault self-healing method and system |
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| CN113695063A (en) * | 2021-09-01 | 2021-11-26 | 江苏鑫特尔冶金机械制造有限公司 | Coal breaking control method and device for special coal mill for low-load metallurgy |
| CN114100833A (en) * | 2021-10-30 | 2022-03-01 | 国家能源集团华北电力有限公司廊坊热电厂 | Control system for adjusting air volume of coal mill under variable working conditions, computer and readable storage medium |
| CN114100833B (en) * | 2021-10-30 | 2022-11-22 | 国家能源集团华北电力有限公司廊坊热电厂 | Control system for adjusting air volume of coal mill under variable working conditions, computer and readable storage medium |
| CN114669389A (en) * | 2022-03-01 | 2022-06-28 | 苏州西热节能环保技术有限公司 | Primary air pressure control method and device for coal mill, storage medium and electronic equipment |
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