CN111367226A - Boiler master control feedforward control method based on wear-stopping prejudgment - Google Patents
Boiler master control feedforward control method based on wear-stopping prejudgment Download PDFInfo
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Abstract
A boiler master control feedforward control method based on wear stopping prejudgment belongs to the field of generator set control and is characterized in that: the negative step signal is triggered after the operation stop signal of the grinding group is judged in advance, the negative step signal acts on the main control feed-forward of the boiler, the coal feeding rate of the coal feeder is reduced, and the main steam pressure overpressure phenomenon under the operation stop working condition of the grinding group is prevented. When the load of the unit is reduced and the working condition of the grinding unit needs to be stopped, the stopping working condition of the grinding unit is pre-judged in advance, the serious problems that the main steam pressure is increased and even exceeds the safe running value of the main steam pressure after pulverized coal cached by the inertia in the coal mill enters a hearth for combustion are solved, the main steam pressure is stabilized within the range required by the safe value, and the safety, the stability and the economical efficiency of the unit operation are ensured.
Description
Technical Field
The invention belongs to the field of generator set control, and particularly relates to a boiler master control feedforward control method based on wear-stopping prejudgment.
Background
With the continuous increase of the power generation capacity of new energy, the requirement of the power grid side on the load response performance of the thermal power generating unit is higher and higher, and the comparison with historical data shows that in the load change of the same period, the load change frequency and the change amplitude of the thermal power generating unit are higher and higher, and the time proportion of the thermal power generating unit participating in deep peak regulation is gradually improved. However, in the process of frequent change of the load of the thermal power generating unit, when the AGC instruction at the power grid side requires load reduction of the thermal power generating unit, along with reduction of the load of the unit, when the load of the unit is reduced to a working condition that the grinding unit needs to be stopped, firstly, the coal feeding rate of a coal feeder of the grinding unit is reduced in a step-wise manner at a certain speed from the current coal feeding rate, after the coal feeding rate of the coal feeder is reduced to the coal feeding rate of the grinding unit stopping buffer, the coal feeder is kept to continuously operate for 1min under the working condition of the coal feeding rate of the grinding unit stopping buffer, then the coal feeding rate instruction of the coal feeder is given for 0t/h, the coal feeding rate of the coal feeder is reduced to 0t/h from the step of the coal feeding rate of. After the coal feeder stops running, the coal mill and a hot primary air door of the coal mill are stopped and closed after delaying for 2min, so that all pulverized coal cached in the coal mill is ensured to be blown into a hearth, the occurrence of deflagration accidents caused by coal accumulation when a next grinding group is started is prevented, but the pulverized coal cached in the coal mill directly causes the rise of main steam pressure in the load reduction process and even exceeds the safety value of the main steam pressure after entering the hearth for combustion.
The research finds that: when the coal feeding rate of the coal feeder is continuously reduced, the primary air powder carrying capacity is correspondingly enhanced under the condition that the primary air pressure is unchanged; meanwhile, after the coal feeder is shut down, the hot primary air blows all the inertia buffer coal powder in the coal grinding into the hearth for combustion. Based on the reasons, when the unit is under load reduction and the grinding unit is out of operation, the main steam pressure cannot be reduced along with the set value of the sliding pressure curve, but rather rises, even exceeds the safety value of the main steam pressure, and serious influence is caused on the safe and stable operation of the unit.
Disclosure of Invention
The invention aims to solve the problems and provides a boiler master control feedforward control method based on grinding stop prejudgment, which is used for solving the problem of main steam pressure overpressure caused by the grinding set stop working condition in the unit load reduction process.
According to the boiler master control feedforward control method based on mill stop prejudgment, a negative step signal is triggered after the running stop signal of the mill group is prejudged, the negative step signal acts on the boiler master control feedforward, the coal feeding rate of a coal feeder is reduced, and the phenomenon of main steam pressure overpressure under the condition that the mill group stops running is prevented.
The invention relates to a boiler master control feedforward control method based on wear-stopping prejudgment, which comprises the following steps of: two paths of signals form a main control feedforward trigger signal of the boiler through an AND gate AND 3; the two paths of signals are respectively an AND3 first path signal AND an AND3 second path signal; the first path of signal of the AND3 is a coal mill operation signal; the AND3 second path signal is a coal feeder stop operation prejudgment signal AND is generated by an RS trigger setting end S;
when the first signal of the AND3 AND the second signal of the AND3 are simultaneously satisfied, the trigger of the AND3 is 1, a pulse signal with the time of 120s is generated through a pulse function block TP, AND the pulse signal is applied to a selection block T; after the trigger condition of the selection block T is met, the selection block T selects the Y path to output a negative step signal to act in the main control feed-forward of the boiler, after the 120s pulse time set by the pulse signal is over, the trigger condition of the selection block T disappears, the trigger condition of the selection block T is not met, and the selection block T selects the N path to output the step signal with the constant value of 0T/h;
after the pulse signal of the pulse functional block TP is triggered, the pulse signal is introduced into the reset terminal R of the RS flip-flop, AND the reset terminal R of the RS flip-flop is triggered to be the signal 1 by the pulse signal of the pulse functional block TP, so that the output terminal of the RS flip-flop is reset to 0, which indicates that the second path of signal of AND3 has been triggered, AND the output of the RS flip-flop is retriggered to be 1 until the condition of the set terminal S of the RS flip-flop at the next time is satisfied.
According to the boiler master control feedforward control method based on the wear-out pre-judgment, the RS trigger position end S is triggered through an output signal 1 of an AND gate AND 2; the output signal 1 of the AND gate AND2 needs to be simultaneously satisfied by a first signal of an AND2, a second signal of an AND2 AND a third signal of an AND 2; the first path of AND2 meets the condition that a coal feeder stop signal is negated; the second path of AND2 signal satisfies the condition that the coal feeding rate feedback of the coal feeder starts to decrease from a previous numerical value which is larger than the coal feeding rate of the shutdown buffer of the grinding group, AND the numerical value within 3s after the decrease is lower than the coal feeding rate of the shutdown buffer of the grinding group; AND the AND2 third signal meets the condition that the deviation between the coal feeding rate command of the coal feeder AND the coal feeding rate feedback of the coal feeder is greater than or equal to the deviation lower limit value AND less than or equal to the deviation upper limit value.
According to the boiler master control feedforward control method based on the wear-stopping prejudgment, the RS trigger position end S is triggered through an output signal 1 of an OR gate OR; the OR gate OR is composed of two signals: the first path of signal and the second path of signal are OR signals and OR second signals respectively; when any one of the two signals of the OR gate OR is satisfied, the RS trigger position end S is triggered to be 1.
The OR first path signal is obtained through the output of an AND gate AND 2; the input of the AND gate AND2 comprises three signals, namely a first signal of an AND2, a second signal of an AND2 AND a third signal of an AND 2; the first path of AND2 meets the condition that a coal feeder stop signal is negated; the second path of AND2 signal satisfies the condition that the coal feeding rate feedback of the coal feeder starts to decrease from a previous numerical value which is larger than the coal feeding rate of the shutdown buffer of the grinding group, AND the numerical value within 3s after the decrease is lower than the coal feeding rate of the shutdown buffer of the grinding group; AND the AND2 third signal meets the condition that the deviation between the coal feeding rate command of the coal feeder AND the coal feeding rate feedback of the coal feeder is greater than or equal to the deviation lower limit value AND less than or equal to the deviation upper limit value.
The OR second path signal is triggered by a manual pre-reduction coal button of an operator, AND when an abnormal emergency working condition occurs, AND the AND3 second path signal is forced to be 1 under the condition that the OR first path signal is not triggered yet, the operator manually clicks the 'manual pre-reduction coal button of the operator' at the moment, AND the OR second path signal is forced to be 1.
According to the boiler master control feedforward control method based on the wear-stopping prejudgment, the selection block T selects a Y path to output a negative-direction step signal, the negative-direction step signal is filtered by a leader function block with the inertia time of 45s, the negative-direction step signal is subjected to first-order inertia processing and then output, and the effective action time is 120s set by a pulse function block TP; the selection block T selects N paths of step signals with the constant value of 0T/h to be output, the step signals with the 0T/h are subjected to first-order inertia processing through a leader lag functional block with the inertia time of 45s, and therefore the main control feed forward of the boiler is slowly attenuated to 0T/h from the current value.
According to the boiler master control feed-forward control method based on the mill stopping prejudgment, when the load of the unit is reduced and the working condition of the mill group is required to be shut down, the shut down working condition of the mill group is prejudged in advance, the serious problem that the main steam pressure is increased and even exceeds the safe running value of the main steam pressure after pulverized coal cached in the internal inertia of a coal mill enters a hearth for combustion is solved, the main steam pressure is stabilized within the range required by the safe value, and the safety, the stability and the economical efficiency of the unit operation are ensured.
Drawings
FIG. 1 is a schematic flow chart of a boiler master control feed-forward control method based on wear-out pre-determination according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a boiler main control feed-forward control method based on wear-out pre-determination according to a second embodiment of the present invention.
Detailed Description
The boiler main control feedforward control method based on wear-out pre-judgment is described in detail below according to the accompanying drawings and embodiments.
Example one
The stop operation signals of the mill groups comprise stop operation signals of the coal feeder, the coal mill, the hot primary air door of the coal mill and other equipment of the same mill group. As shown in FIG. 1, the boiler master control feedforward control method based on wear-out pre-judgment of the invention comprises the following steps:
firstly, when a coal mill running signal is triggered to be 1 when the coal mill runs, the first path of signal condition of the AND gate AND3 is a trigger state 1; when the coal mill stops running, the coal mill running signal disappears, the coal mill running signal is 0, AND the first path of signal of the AND gate AND3 is in a non-trigger state of 0.
AND secondly, a second path of signal of the AND3 is a coal feeder stop operation pre-judging signal. A coal feeder operation stop prejudging signal is generated through a set end S of an RS trigger; the RS trigger position end S is triggered by three condition phases of an AND gate AND2 AND a rear output signal 1, namely an AND2 first path signal (a coal feeder stop signal is negated), an AND2 second path signal (a coal feeder coal feeding rate feedback is started to fall by a value which is larger than a grinding group stop buffer coal feeding rate before AND is lower than the grinding group stop buffer coal feeding rate within 3S after the fall), AND2 third path signal (deviation between a coal feeder coal feeding rate instruction AND the coal feeder coal feeding rate feedback is larger than or equal to a deviation lower limit value AND smaller than or equal to a deviation upper limit value), AND AND2 is triggered to be 1 when the three conditions are met simultaneously; meanwhile, the RS trigger outputs 1, the second path of conditions of the AND gate AND3 are met, AND the output is 1; the buffer coal feeding rate of the mill group during shutdown in the embodiment is 20 t/h; in this embodiment, the lower limit of the deviation is-5 t/h, and the upper limit of the deviation is 5 t/h.
AND gate AND2 first signal: and negating the coal feeder stop signal. When the coal feeder stop signal is negated through the NOT gate N AND then is 1, a first path of signal of the AND gate AND2 is triggered, namely when the coal feeder is in the running state, the coal feeder stop signal is 0, AND a first path of signal of the NOT gate AND2 is 1; when the coal feeder is stopped, the coal feeder stop signal is 1, AND the first path of signal of the NOT AND gate AND2 is 0.
AND gate AND2 second path signal: feeding coal rate feedback of the coal feeder starts to decrease from a previous numerical value which is larger than the shutdown buffer coal feeding rate of the grinding set, and the numerical value within 3s after the decrease is lower than the shutdown buffer coal feeding rate of the grinding set; the second path of signals of the AND gate AND2 is realized by an AND gate AND1, AND gate AND1 comprises two paths of signals: the first signal of the AND1 AND the second signal of the AND 1. When the two signals of AND1 are satisfied simultaneously, the AND1 signal toggles to 1.
AND1 first signal: the coal feeding rate feedback of the coal feeder is formed by limiting through a 3s hysteresis reset function block TOFF after the high value judgment function block H/judgment with the set value of 'grinding group shutdown buffer coal feeding rate'. When the coal feeding rate feedback of the coal feeder is greater than the coal feeding rate of the stop buffer of the grinding group, the H/output of the high value judging function block is 1, the TOFF output of the hysteresis resetting function block is 1, when the coal feeding rate feedback of the coal feeder starts to fall from a value greater than the coal feeding rate of the stop buffer of the grinding group to a certain value less than the coal feeding rate of the stop buffer of the grinding group, the H/output of the high value judging function block is 0, but after the limitation of the TOFF of the hysteresis resetting function block for 3s, the output of the hysteresis resetting function block TOFF keeps 1 within 3s after the coal feeding rate feedback of the coal feeder falls to a value less than the coal feeding rate of the stop buffer of the grinding group, and the output of the hysteresis resetting function block TOFF becomes 0 after the coal feeding rate feedback of the coal feeder falls to 3s less than the coal feeding rate of the stop buffer of the grinding group.
AND1 second path signal: the coal feeding rate feedback of the coal feeder is formed by L/judgment of a low-value judgment function block with the set value of 'mill group stop buffer coal feeding rate'. AND when the coal feeding rate feedback of the coal feeder is smaller than the coal feeding rate of the mill group shutdown buffer, the output is 1 after L/judgment of the low value judgment function block, AND the second path of AND1 is conducted. When the coal feeding rate feedback of the coal feeder starts to decrease from a value larger than the coal feeding rate of the mill group shutdown buffer AND decreases to a value smaller than the coal feeding rate of the mill group shutdown buffer, the AND1 second path signal is triggered to be 1.
Under the action of a 3s hysteresis reset function block TOFF, the first path of signal of AND1 is still kept as 1 within 3s after the coal feeding rate of the coal feeder is fed back AND reduced to be smaller than the coal feeding rate of the stop buffer of the grinding group, AND then the first path of signal of AND1 AND the second path of signal of AND1 are both 1 at the same time, the trigger of the signal of AND1 is 1, AND the trigger of the second path of signal of AND gate AND2 is 1.
AND2 third signal: and the deviation between the coal feeding rate instruction of the coal feeder and the coal feeding rate feedback of the coal feeder is greater than or equal to a deviation lower limit value and less than or equal to a deviation upper limit value. The deviation between the coal feeding rate instruction of the coal feeder and the coal feeding rate feedback of the coal feeder is larger than or equal to the deviation lower limit value and smaller than or equal to the deviation upper limit value signal, the coal feeding rate feedback of the coal feeder is subtracted from the coal feeding rate instruction of the coal feeder through a subtraction function block SUB, and the difference between the coal feeding rate instruction of the coal feeder and the coal feeding rate feedback of the coal feeder is judged through a high-low limit function block H/L and a negation function block N. When the difference value between the high-limit function block AND the low-limit function block is larger than the deviation upper limit value or smaller than the deviation lower limit value, the output of the high-limit function block AND the low-limit function block is 1, the coal feeding rate instruction of the coal feeder AND the coal feeding rate feedback deviation of the coal feeder are large, the output signal of the function block H/L is negated through a NOT gate N AND then is 0, AND the third signal of the AND gate AND2 is not satisfied AND is output as 0. When the difference value between the high-limit function block AND the low-limit function block is greater than or equal to the deviation lower limit value AND less than or equal to the deviation upper limit value, the output of the high-limit function block H/L is 0, the coal feeding rate command of the coal feeder AND the feedback deviation of the coal feeding rate of the coal feeder are not large at the moment, the output signal of the function block H/L is 1 after being negated through the NOT gate N within the allowable deviation value range, AND the third path signal of the AND gate AND2 meets the requirement AND is output as 1 at the moment.
AND a second path of signal of the AND3, namely a coal feeder stop operation prejudgment signal, is realized by an RS trigger, S is a position end, AND R is a reset end. When the three conditions of the AND gate AND2 are simultaneously met, the S condition at the set end of the RS trigger is 1, the output of the RS trigger is 1, AND the second path of condition trigger of the AND gate 3 is 1; when the R condition at the reset end of the RS trigger is 1, the output of the RS trigger is 0, AND meanwhile, the second path of the AND3 is not triggered AND the output is 0.
When the first signal of the AND3 AND the second signal of the AND3 are satisfied simultaneously, the AND3 is triggered to be 1, a pulse signal with the time of 120s is generated through the pulse function block TP, AND the pulse signal is applied to the selection block T.
Finally, after the trigger condition of the selection block T is met, the selection block T selects the Y path to output a negative step signal, wherein the negative step signal is-6T/h in the embodiment; for the stability of the system, filtering the negative-going step signal by a leader function block with inertia time of 45s, performing first-order inertia processing on the negative-going step signal, and outputting the negative-going step signal, wherein the effective action time is 120s set by the pulse function block TP; after the 120s pulse signal set by the pulse function block TP is finished, the trigger condition of the selection block T is not met, the selection block T selects N paths to output a step signal with a fixed value of 0T/h, and for the stability of the system, the step signal with the fixed value of 0T/h passes through a leader lag function block with the inertia time of 45s to be subjected to first-order inertia processing, so that the main control feedforward of the boiler is slowly attenuated to 0T/h from the current value.
When the two conditions of the AND gate AND3 are satisfied simultaneously, the trigger pulse function block TP generates a pulse signal with a signal 1 for 120 s. One path of the pulse signal is applied to a selection block T; and the other path of the pulse signal is sent to a reset end R of the RS trigger to reset the RS trigger, the output value of the RS trigger is reset to 0, and the RS trigger is triggered again until the triggering condition of the position end S of the RS trigger is met next time.
Example two
The boiler main control feedforward control method based on wear-out pre-judgment is described in detail below according to the accompanying drawings and embodiments.
As shown in fig. 2, on the basis of the first embodiment, the boiler main control feed-forward control method based on the wear-out prediction in this embodiment includes the following steps:
firstly, when the coal mill is operated, a coal mill operation signal is triggered to be 1, the first path of signal condition of the AND gate AND3 is a trigger state 1, when the coal mill stops operating, the coal mill operation signal disappears, the coal mill operation signal is 0, AND the first path of signal of the AND gate AND3 is a non-trigger state 0.
AND secondly, a second path of signal of the AND3 is a coal feeder stop operation pre-judging signal. A coal feeder operation stop prejudging signal is generated through a set end S of an RS trigger; the RS trigger comprises an S position end and an R reset end. The RS trigger position end S is triggered through an output signal 1 of an OR gate OR; the OR gate OR is composed of two signals: the first path of signal and the second path of signal are OR signals and OR second signals respectively; when any one of the two signals of the OR gate OR is satisfied, the RS trigger position end S is triggered to be 1.
The OR first path signal is obtained through the output of the AND gate AND 2; the input of the AND gate AND2 comprises three signals, namely an AND2 first signal, an AND2 second signal AND an AND2 third signal; the first path of AND2 meets the condition that a coal feeder stop signal is negated; the second path of AND2 signal satisfies the condition that the coal feeding rate feedback of the coal feeder starts to decrease from a previous numerical value which is larger than the coal feeding rate of the shutdown buffer of the grinding group, AND the numerical value within 3s after the decrease is lower than the coal feeding rate of the shutdown buffer of the grinding group; AND the AND2 third signal meets the condition that the deviation between the coal feeding rate command of the coal feeder AND the coal feeding rate feedback of the coal feeder is greater than or equal to the deviation lower limit value AND less than or equal to the deviation upper limit value.
The OR second path signal is obtained by manually clicking an operator manual pre-reduction coal button; when an abnormal emergency condition occurs, when the second signal of the AND3 needs to be forcibly triggered to be 1 under the condition that the first signal of the OR is not triggered yet, at the moment, an operator manually clicks a 'operator manually pre-reducing coal button', AND the second signal of the OR is forcibly triggered to be 1;
when the second path of signal trigger of the OR gate OR is 1, the S condition at the positioning end of the RS trigger is 1, the output of the RS trigger is 1, AND the second path of signal trigger of the AND3 is 1, namely the coal feeder stop operation prejudgment signal is 1; when the R condition at the reset end of the RS trigger is 1, the output of the RS trigger is 0, AND meanwhile, the second path of the AND3 is not triggered AND the output is 0.
When the first signal of the AND3 AND the second signal of the AND3 are satisfied simultaneously, the AND3 is triggered to be 1, a pulse signal with a signal of 1 is generated for 120s through the pulse function block TP, AND the pulse signal is applied to the selection block T.
Finally, after the trigger condition of the selection block T is met, the selection block T selects the Y path to output a negative step signal, wherein the negative step signal is-6T/h in the embodiment; for the stability of the system, filtering the negative-going step signal by a leader function block with inertia time of 45s, performing first-order inertia processing on the negative-going step signal, and outputting the negative-going step signal, wherein the effective action time is 120s set by the pulse function block TP; after the 120s pulse signal set by the pulse function block TP is finished, the trigger condition of the selection block T is not met, the selection block T selects N paths to output a step signal with a fixed value of 0T/h, and for the stability of the system, the step signal with the fixed value of 0T/h passes through a leader lag function block with the inertia time of 45s to be subjected to first-order inertia processing, so that the main control feedforward of the boiler is slowly attenuated to 0T/h from the current value.
When the two conditions of the AND gate AND3 are satisfied simultaneously, the trigger pulse function block TP generates a pulse signal with a signal 1 for 120 s. One path of the pulse signal is applied to a selection block T; and the other path of the pulse signal is sent to a reset end R of the RS trigger to reset the RS trigger, the output value of the RS trigger is reset to 0, and the RS trigger is triggered again until the triggering condition of the position end S of the RS trigger is met next time.
Claims (5)
1. A boiler master control feedforward control method based on wear stopping prejudgment is characterized in that: the negative step signal is triggered after the operation stop signal of the grinding group is judged in advance, the negative step signal acts on the main control feed-forward of the boiler, the coal feeding rate of the coal feeder is reduced, and the main steam pressure overpressure phenomenon under the operation stop working condition of the grinding group is prevented.
2. The boiler main control feed-forward control method based on wear-stopping prejudgment according to claim 1, characterized by comprising the following steps:
two paths of signals form a main control feedforward trigger signal of the boiler through an AND gate AND 3; the two paths of signals are respectively an AND3 first path signal AND an AND3 second path signal;
the first path of signal of the AND3 is a coal mill operation signal; the AND3 second path signal is a coal feeder stop operation prejudgment signal AND is generated by an RS trigger setting end S;
when the first signal of the AND3 AND the second signal of the AND3 are simultaneously satisfied, the trigger output of the AND3 is 1, a pulse signal with the time of 120s is generated through a pulse function block TP, AND the pulse signal is applied to a selection block T;
after the trigger condition of the selection block T is met, the selection block T selects the Y path to output a negative step signal to act in the main control feed-forward of the boiler, after the set 120s pulse time of the pulse signal is over, the trigger condition of the selection block T disappears, the trigger condition of the selection block T is not met, and the selection block T selects the N path to output the step signal with the constant value of 0T/h;
after the pulse signal of the pulse functional block TP is triggered, the pulse signal is introduced into the reset terminal R of the RS flip-flop, and the reset terminal R of the RS flip-flop is triggered to be the signal 1 by the pulse signal of the pulse functional block TP, so the output terminal of the RS flip-flop is reset to 0, and the output of the RS flip-flop is re-triggered to be 1 until the next time the condition of the set terminal S of the RS flip-flop is satisfied.
3. The boiler master control feed-forward control method based on wear-stopping prejudgment as claimed in claim 2, wherein: the RS trigger position end S is triggered by an output signal 1 of an AND gate AND 2; the output signal 1 of the AND gate AND2 needs to be simultaneously satisfied by a first signal of an AND2, a second signal of an AND2 AND a third signal of an AND 2; the first path of AND2 meets the condition that a coal feeder stop signal is negated; the second path of AND2 signal satisfies the condition that the coal feeding rate feedback of the coal feeder starts to decrease from a previous numerical value which is larger than the coal feeding rate of the shutdown buffer of the grinding group, AND the numerical value within 3s after the decrease is lower than the coal feeding rate of the shutdown buffer of the grinding group; AND the AND2 third signal meets the condition that the deviation between the coal feeding rate command of the coal feeder AND the coal feeding rate feedback of the coal feeder is greater than or equal to the deviation lower limit value AND less than or equal to the deviation upper limit value.
4. The boiler master control feed-forward control method based on wear-stopping prejudgment as claimed in claim 2, wherein: the RS trigger position end S is triggered through an output signal 1 of an OR gate OR; the OR gate OR consists of two paths of signals which are an OR first path signal and an OR second path signal respectively;
the OR first path signal is obtained through the output of an AND gate AND 2; the input of the AND gate AND2 comprises three signals, namely a first signal of an AND2, a second signal of an AND2 AND a third signal of an AND 2; the first path of AND2 meets the condition that a coal feeder stop signal is negated; the second path of AND2 signal satisfies the condition that the coal feeding rate feedback of the coal feeder starts to decrease from a previous numerical value which is larger than the coal feeding rate of the shutdown buffer of the grinding group, AND the numerical value within 3s after the decrease is lower than the coal feeding rate of the shutdown buffer of the grinding group; the AND2 third signal meets the condition that the deviation between the coal feeding rate instruction of the coal feeder AND the coal feeding rate feedback of the coal feeder is greater than or equal to the deviation lower limit value AND less than or equal to the deviation upper limit value; and the OR second path signal is triggered by a manual pre-reduction coal button of an operator.
5. The boiler main control feed-forward control method based on wear-stopping prejudgment according to claim 3 or 4, characterized in that: the selection block T selects the Y path to output a negative step signal, the negative step signal is filtered by a leader function block with inertia time of 45s, the negative step signal is subjected to first-order inertia processing and then output, and the effective action time is 120s set by the pulse function block TP; the selection block T selects N paths of step signals with the constant value of 0T/h to be output, the step signals with the 0T/h are subjected to first-order inertia processing through a leader lag functional block with the inertia time of 45s, and therefore the main control feed forward of the boiler is slowly attenuated to 0T/h from the current value.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113391615B (en) * | 2021-05-10 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Variable time pulse algorithm for probability statistics |
| CN113341703A (en) * | 2021-05-11 | 2021-09-03 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Pre-coaling feed-forward optimal time difference algorithm for starting mill pre-judgment |
| CN113341703B (en) * | 2021-05-11 | 2022-11-15 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Pre-coaling feed-forward optimal time difference method for grinding starting pre-judgment |
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