CN114355764A - Slag cooler intelligent regulation control system and method based on feedforward temperature change rate - Google Patents
Slag cooler intelligent regulation control system and method based on feedforward temperature change rate Download PDFInfo
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- CN114355764A CN114355764A CN202210011170.4A CN202210011170A CN114355764A CN 114355764 A CN114355764 A CN 114355764A CN 202210011170 A CN202210011170 A CN 202210011170A CN 114355764 A CN114355764 A CN 114355764A
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Abstract
The invention belongs to the technical field of slag cooler intelligent control, and particularly relates to a slag cooler intelligent regulation control system and method based on a feedforward temperature change rate; the slag cooler automatically controls a PID output instruction to be connected to a first input end i of the adder1The slag inlet temperature change rate per minute is fitted into a slag cooler frequency increasing and decreasing action quantity signal through a function generator M3, the slag cooler frequency increasing and decreasing action quantity signal is filtered by a lead-lag generator M4 and then is connected to a second input end i of the adder7(ii) a The change rate of the slag tapping temperature per minute is fitted into a slag cooler frequency increasing and decreasing action quantity signal through a function generator M7, the slag cooler frequency increasing and decreasing action quantity signal is filtered by a lead-lag generator M8 and then is connected to a third input end i of the adder13(ii) a The change rate of the return water temperature per minute is fitted into a slag cooler frequency increasing and decreasing action quantity signal through a function generator M11, the slag cooler frequency increasing and decreasing action quantity signal is filtered by a lead-lag generator M12 and then is connected to a fourth input end i of the adder19And the adder outputs an automatic control output instruction of the slag cooler. The invention ensures the continuous and reliable operation of the slag cooling system of the circulating fluidized bed boiler and the safe and stable operation of the unit.
Description
Technical Field
The invention belongs to the technical field of slag cooler intelligent control, and particularly relates to a slag cooler intelligent regulation control system and method based on a feedforward temperature change rate.
Background
In the combustion process of the circulating fluidized bed boiler, burnt ash and impurities are discharged while a certain amount of material in the bed is maintained, so that the coal feeding amount and the slag discharging amount are in a balanced state, and the temperature and normal fluidization of the bed material are ensured. Aiming at different operation conditions of the boiler, an operator on duty needs to adjust a balance point of the slag cooler in time, the operation of the slag cooler is a very frequent operation of the circulating fluidized bed boiler and is also a device which is most easy to generate abnormity, abnormal phenomena such as slag blockage, slag flowing, excessive temperature of slag discharging and the like of the slag cooler frequently occur in the slag discharging operation process of the boiler, because the rotating speed of the slag cooler is slow, the abnormal conditions are relatively lagged and not easy to be found in the early stage, although workers are arranged to process the slag cooler when the slag cooler is to be found, the working efficiency is greatly influenced by factors such as dangerous working environment, high temperature, dust, noise, large labor intensity and the like, the abnormal phenomena such as the trip of the slag cooler caused by non-timely processing possibly causes the bed pressure to exceed the limit, the overcurrent protection action of a primary fan, the boiler is tripped, non-stop accidents are caused, and huge economic losses are caused, the personal safety and the unit safety are seriously affected, the automatic control strategy of the conventional slag cooler is single, the abnormal operation of the slag cooler cannot be found and adjusted in time, and the safe and stable operation of the slag cooler is guaranteed to be the premise of the reliable operation of the circulating fluidized bed boiler, so that the intelligent regulation control strategy of the slag cooler is required to solve the problems.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides an intelligent slag cooler regulation control system and method based on a feedforward temperature change rate.
In order to solve the technical problems, the invention adopts the technical scheme that: during the production and operation of the slag cooler of the circulating fluidized bed boiler, various parameters of the slag cooler are analyzed and researched, the slag temperature, the slag discharging temperature and the return water temperature of the slag cooler after slag blockage are all reduced, the slag feeding temperature, the slag discharging temperature and the return water temperature of the slag cooler after slag flowing are all increased, the return water temperature of the slag cooler after excessive slag discharging is also increased along with the slag blockage, therefore, by introducing feed-forward control, the change rate per minute of the slag feeding temperature, the slag discharging temperature and the return water temperature of the slag cooler are respectively simulated by a function generator into slag cooler frequency increasing and decreasing action signals, filtered by a lead lag generator and respectively superposed into a PID automatic control loop of the slag cooler, the dynamic feed-forward technology is adopted to instantaneously increase or decrease the frequency of the slag cooler, so that the frequency of the slag cooler synchronously changes along with the change rates per minute of the slag feeding temperature, the slag discharging temperature and the return water temperature, the frequency of the slag cooler is increased and decreased in time, and the slag feeding temperature is better stabilized, The slag outlet temperature, the water return temperature, the bed pressure and other parameters prevent the slag cooler from blocking slag, flowing slag, excessive temperature of slag discharge and other abnormal phenomena, and ensure the continuous and reliable operation of the slag cooling system of the circulating fluidized bed boiler, thereby ensuring the safe and stable operation of the unit.
The slag cooler intelligent regulation control system based on the feedforward temperature change rate comprises an automatic control output instruction PT1, a plurality of branch lines and an adder unit M13, wherein output ports of the automatic control output instruction PT1 and the branch lines are connected to an input port of the adder unit M13, and an output port of the adder unit M13 outputs a final slag cooler automatic control instruction 013；
The branch lines comprise a first branch line, a second branch line and a third branch line, the first branch line comprises a transmitter unit, a pure delay generator M1 and a lead lag generator M4, and the output end of the transmitter unit is divided into two lines which are respectively connected to the input end of the pure delay generator M1 and the input end i of a subtracter unit M23An output of the net delay generator M1 and an input i of the subtractor unit M24The subtractor unit M2 processes the received data information and outputs the processed data information to the function generator M3, the output port of the function generator M3 is connected to the input port of the lead-lag generator M4, and the output port of the lead-lag generator M4 is connected to the adder unit M13;
the second branch line and the third branch line have the same structure as the first branch line.
Preferably, the transmitter unit in the first branch line is a slag inlet temperature parameter transmitter PT2, the transmitter unit in the second branch line is a slag outlet temperature parameter transmitter PT3, and the transmitter unit in the third branch line is a return water temperature parameter transmitter PT 4.
Preferably, the pure delay time of the pure delay generator M1 is 60 s.
Preferably, the lead time S1 of the lead-lag generator M4 is 0S, and the lag time S2 of the lead-lag generator M4 is 5S.
According to the method for intelligently adjusting and controlling the slag cooler based on the feedforward temperature change rate, the method specifically comprises the following steps:
s1: automatically control theThe output command PT1 is used to obtain the original data information i of slag cooler1Input into adder unit M13;
s2: data information i is obtained by a slag-in temperature parameter transmitter in the first branch line2To the pure delay generator M1 and the subtractor unit M2;
s3: pure delay generator M1 for received data information i2Processing the data to obtain i2Value o after a pure delay of 60s1The pure delay generator M1 converts the data o1Input to subtractor unit M2;
s4: the subtractor unit M2 operates on data o1And i3Analyzing and processing to determine the change rate o of the slag inlet temperature of the slag cooler per minute2；
S5: rate of change of slag-in temperature per minute o2Fitting the frequency increasing and decreasing action quantity signal o of the slag cooler through a function generator M33；
S6: frequency increasing and decreasing action signal o of slag cooler3Filtered by a lead-lag generator M4 to determine a filtered value o4Filtering the value o4Input to adder unit M13;
s7: the second branch line and the third branch line repeat the steps S2-S6, determine the change rate of the slag outlet temperature per minute and the change rate of the return water temperature per minute, respectively simulate to form a slag cooler frequency increasing and decreasing action quantity signal through a function generator, and input the slag cooler frequency increasing and decreasing action quantity signal to an adder unit M13 after being filtered by a lead-lag generator;
s8: the adder unit M13 integrates the data in steps S1, S6 and S7 to obtain the final slag cooler automatic control output command o13。
Compared with the prior art, the invention has the beneficial effects that:
the invention solves the technical problem that the abnormal working conditions of slag blockage, slag flowing, excessive temperature of discharged slag and the like of a slag cooler are caused by untimely and unintelligent adjustment of the slag cooler so as to influence the safe operation of a unit, and according to the proportional relation between the abnormal working conditions of slag blockage, slag flowing, excessive temperature of discharged slag and the like of the slag cooler and various parameters of the slag cooler, such as the slag inlet temperature, the discharged slag temperature and the return water temperature, on the basis of the PID control strategy of the conventional slag cooler, through introducing feed-forward control, the change rates of the slag inlet temperature, the discharged slag temperature and the return water temperature of the slag cooler are respectively synthesized into a slag cooler frequency increasing and decreasing action quantity signal through a function generator and are respectively superposed into an original PID automatic control loop of the slag cooler after being filtered by an advance-lag generator, so as to more timely and more intelligently adjust the bed pressure, the slag inlet temperature, the discharged slag temperature and the return water temperature, and reduce the burn risk caused by the abnormity of manually-treated slag cooler, the labor intensity of workers is reduced, the safe, continuous and stable operation of the slag cooler is ensured, and the safe and stable operation of the unit is also ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in the figure, the slag cooler intelligent regulation control system based on the feedforward temperature change rate comprises an automatic control output instruction PT1, a plurality of branch circuits and an adder unit M13, wherein output ports of the automatic control output instruction PT1 and the branch circuits are connected to an input port of the adder unit M13, and an output port of the adder unit M13 outputs a final slag cooler automatic control instruction 013。
The branch lines comprise a first branch line, a second branch line and a third branch line, the first branch line comprises a slag inlet temperature parameter transmitter PT2, a pure delay generator M1 and a lead lag generator M4, and the output end of the slag inlet temperature parameter transmitter PT2 is divided into two lines which are respectively connected to the input end of the pure delay generator M1 and the input end i of a subtracter unit M23The net delay time of the net delay generator M1 is 60s, and the output terminal of the net delay generator M1 and the input terminal i of the subtractor unit M24The subtractor unit M2 processes the received data information and outputs the processed data information to the function generator M3, the output port of the function generator M3 is connected to the input port of the lead-lag generator M4, the output port of the lead-lag generator M4 is connected to the adder unit M13, and the adder unit M13 is connected to the output port of the lead-lag generator M4The lead time S1 of the lead-lag generator M4 is 0S, and the lag time S2 of the lead-lag generator M4 is 5S;
the second branch line comprises a slag tapping temperature parameter transmitter PT3, a pure delay generator M5 and a lead delay generator M8, wherein the output end of the slag tapping temperature parameter transmitter PT3 is divided into two lines which are respectively connected to the input end of the pure delay generator M5 and the input end i of a subtracter unit M69The net delay time of the net delay generator M5 is 60s, and the output terminal of the net delay generator M5 and the input terminal i of the subtractor unit M610The subtractor unit M6 processes the received data information and outputs the processed data information to the function generator M7, the output port of the function generator M7 is connected to the input port of the lead-lag generator M8, and the output port of the lead-lag generator M8 is connected to the adder unit M13.
The third branch line comprises a return water temperature parameter transmitter PT4, a pure delay generator M9 and a lead delay generator M12, and the output end of the return water temperature parameter transmitter PT4 is divided into two lines which are respectively connected to the input end of the pure delay generator M9 and the input end i of a subtracter unit M1015The net delay time of the net delay generator M9 is 60s, and the output terminal of the net delay generator M9 and the input terminal i of the subtractor unit M1016The subtractor unit M10 processes the received data information and outputs the processed data information to the function generator M11, the output port of the function generator M11 is connected to the input port of the lead-lag generator M12, and the output port of the lead-lag generator M12 is connected to the adder unit M13.
According to the method for intelligently adjusting and controlling the slag cooler based on the feedforward temperature change rate, the method specifically comprises the following steps:
s1: the automatic control output instruction PT1 is used for sending the original data information i of the slag cooler1Input into adder unit M13;
s2: data information i is obtained by a slag-in temperature parameter transmitter in the first branch line2To the pure delay generator M1 and the subtractor unit M2;
s3: pure delay generator M1 for received data information i2Processing the data to obtain i2Value o after a pure delay of 60s1The pure delay generator M1 converts the data o1Input to subtractor unit M2;
s4: the subtractor unit M2 operates on data o1And i3Analyzing and processing to determine the change rate o of the slag inlet temperature of the slag cooler per minute2；
S5: rate of change of slag-in temperature per minute o2Fitting the frequency increasing and decreasing action quantity signal o of the slag cooler through a function generator M33(ii) a In the function generator M3, the functional relationship between the abscissa x and the ordinate y is as shown in table 1:
table 1 function generator M3 function relationship change
| The rate of change of the slag inlet temperature is ℃/min | -20 | -1 | 1 | 20 |
| Output value Hz of fitting curve | 10 | 0 | 0 | -10 |
S6: frequency increasing and decreasing action signal o of slag cooler3Filtered by a lead-lag generator M4 to determine a filtered value o4Filtering the value o4Input to adder unit M13;
s7: the second branch line and the third branch line repeat the steps S2-S6, determine the change rate of the slag outlet temperature per minute and the change rate of the return water temperature per minute, respectively simulate to form a slag cooler frequency increasing and decreasing action quantity signal through a function generator, and input the slag cooler frequency increasing and decreasing action quantity signal to an adder unit M13 after being filtered by a lead-lag generator;
the functional relation between the function generator M7 in the second branch line, abscissa x and ordinate y is as shown in table 2:
TABLE 2 function generator M7 function relationship variation
| Slag temperature change rate/min | -20 | -1 | 1 | 20 |
| Output value Hz of fitting curve | 6 | 0 | 0 | -20 |
The functional relationship between the function generator M11 in the third branch, abscissa x and ordinate y is as shown in table 3:
TABLE 3 function generator M11 function relationship variation
S8: the adder unit M13 integrates the data in steps S1, S6 and S7 to obtain the final slag cooler automatic control output command o13。
The calculation expression of the lead-lag generator in the invention is as follows:
where the scan time dt is 250 ms.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.
Claims (5)
1. The slag cooler intelligent regulation control system based on the feedforward temperature change rate is characterized by comprising an automatic control output instruction PT1, a plurality of branch circuits and an adder unit M13, wherein output ports of the automatic control output instruction PT1 and the branch circuits are connected to an input port of the adder unit M13, and an output port of the adder unit M13 outputs a final slag cooler automatic control instruction 013；
The branch lines comprise a first branch line, a second branch line and a third branch line, the first branch line comprises a transmitter unit, a pure delay generator M1 and a lead lag generator M4, and the output end of the transmitter unit is divided into two lines which are respectively connected to the input end of the pure delay generator M1 and the input end i of a subtracter unit M23Said pure delay occursThe output terminal of the device M1 and the input terminal i of the subtractor unit M24The subtractor unit M2 processes the received data information and outputs the processed data information to the function generator M3, the output port of the function generator M3 is connected to the input port of the lead-lag generator M4, and the output port of the lead-lag generator M4 is connected to the adder unit M13;
the second branch line and the third branch line have the same structure as the first branch line.
2. The feed-forward temperature change rate-based slag cooler intelligent regulation control system of claim 1, wherein the transmitter unit in the first branch line is a slag inlet temperature parameter transmitter PT2, the transmitter unit in the second branch line is a slag outlet temperature parameter transmitter PT3, and the transmitter unit in the third branch line is a return water temperature parameter transmitter PT 4.
3. A feed forward temperature rate of change based slag cooler intelligent regulation control system as set forth in claim 2, wherein the net delay time of the net delay generator M1 is 60 s.
4. A feed forward temperature rate of change based slag cooler intelligent regulation control system as claimed in claim 3, wherein the lead time S1 of the lead lag generator M4 is 0S and the lag time S2 of the lead lag generator M4 is 5S.
5. The method for intelligently adjusting the control system of the slag cooler based on the feedforward temperature change rate as claimed in claim 4, is characterized by comprising the following steps:
s1: the automatic control output instruction PT1 is used for sending the original data information i of the slag cooler1Input into adder unit M13;
s2: data information i is obtained by a slag-in temperature parameter transmitter in the first branch line2To the pure delay generator M1 and the subtractor unit M2;
s3: pure delay generator M1 for received data information i2Processing the data to obtain i2Value o after a pure delay of 60s1The pure delay generator M1 converts the data o1Input to subtractor unit M2;
s4: the subtractor unit M2 operates on data o1And i3Analyzing and processing to determine the change rate o of the slag inlet temperature of the slag cooler per minute2；
S5: rate of change of slag-in temperature per minute o2Fitting the frequency increasing and decreasing action quantity signal o of the slag cooler through a function generator M33；
S6: frequency increasing and decreasing action signal o of slag cooler3Filtered by a lead-lag generator M4 to determine a filtered value o4Filtering the value o4Input to adder unit M13;
s7: the second branch line and the third branch line repeat the steps S2-S6, determine the change rate of the slag outlet temperature per minute and the change rate of the return water temperature per minute, respectively simulate to form a slag cooler frequency increasing and decreasing action quantity signal through a function generator, and input the slag cooler frequency increasing and decreasing action quantity signal to an adder unit M13 after being filtered by a lead-lag generator;
s8: the adder unit M13 integrates the data in steps S1, S6 and S7 to obtain the final slag cooler automatic control output command o13。
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