CN104848253A - Method and device for air capacity control of thermal power generating unit applicable to low nitrogen oxide emission and air capacity control system - Google Patents
Method and device for air capacity control of thermal power generating unit applicable to low nitrogen oxide emission and air capacity control system Download PDFInfo
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- CN104848253A CN104848253A CN201510244064.0A CN201510244064A CN104848253A CN 104848253 A CN104848253 A CN 104848253A CN 201510244064 A CN201510244064 A CN 201510244064A CN 104848253 A CN104848253 A CN 104848253A
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Abstract
The invention discloses a method and a device for air capacity control of a thermal power generating unit applicable to low nitrogen oxide emission and an air capacity control system.The method comprises the following steps: making a difference between actual value and setting value of the total air amount of the A side, generating deviation signals and delivering to a PID controller at an A side; after making difference between the actual value and the setting value of the total air amount of the B side, generating deviation signals and delivering to a PID controller at a B side; after making difference between the running current of a blower at an A side and the running current of a blower at a B side, generating deviation signals and delivering to a PID controller of a balance loop; overlaying an output of the PID controller at the A side to the output of the PID controller of the balance loop, generating the control instruction of the blower of the A side; overlaying the output of the PID controller at the B side to the output of the PID controller of the balance loop, generating the control instruction of the blower at the B side. The method and the device have the beneficial effects: two PID control can set different control parameters, satisfy the equipment property difference of the blowers at both sides, and improve the control precision.
Description
Technical field
The present invention relates to fired power generating unit air output control technology field, particularly relate to a kind of the fired power generating unit air output control method and the system that are applicable to low-nitrogen oxide discharging.
Background technology
Along with environmental protection pressure is increasing, the emission problem of fired power generating unit is also paid close attention to more and more widely.For meeting more and more stricter discharge standard requirement, thermal power plant takes the technological means such as low nitrogen burning transformation and denitrating flue gas to control the discharge of nitrogen oxide mostly.Wherein, low nitrogen burning transformation is the effective means controlling nitrogen oxide generation, effectively can reduce nitrogen oxide outlet drain value.But, low nitrogen burning transformation process is very large to the change of boiler plant, the system performance of whole combustion system and the method for operation is made to there occurs great variety, although therefore improved unit meets discharged nitrous oxides standard, the problems such as the fluctuation of the unit such as main steam pressure, main steam temperature major parameter, combustion instability are generally there is.
In addition, low nitrogen burning transformation suppresses the generation of nitrogen oxide in combustion process by air staged combustion technology, also be the main cause causing combustion instability simultaneously, therefore, stablize and accurate air output controls smooth combustion process very important with the generation controlling nitrogen oxide.
Existing fired power generating unit A side, B side share a PID regulating loop, therefore very high to the requirement of A side and B Lateral supply machine equipment, otherwise can affect the control accuracy of both sides pressure fan.
Summary of the invention
Object of the present invention is exactly that provide a kind of fired power generating unit air output method and system being applicable to low-nitrogen oxide discharging, the method and system can meet the device characteristics difference of both sides pressure fan in order to solve the problem, and improves control accuracy.
For achieving the above object, the present invention adopts following technical proposals:
Be applicable to a fired power generating unit air output control method for low-nitrogen oxide discharging, comprise the following steps:
(1), after the measured value of fired power generating unit A side total blast volume and setting value being carried out do difference, produce deviation signal and send into A side PID controller;
(2), after the measured value of fired power generating unit B side total blast volume and setting value being carried out do difference, produce deviation signal and send into B side PID controller;
(3), after the running current of the running current of fired power generating unit A Lateral supply machine and B Lateral supply machine being carried out doing difference, produce deviation signal and send into balanced loop PID controller;
(4) output of fired power generating unit A side PID controller is superposed with the output of balanced loop PID controller, produce final thermal motor A Lateral supply machine control instruction;
(5) output of fired power generating unit B side PID controller is superposed with the output of balanced loop PID controller, produce final thermal motor B Lateral supply machine control instruction.
Described A side PID controller exports the regulating command of A Lateral supply machine according to the deviation signal received; B side PID controller exports the regulating command of B Lateral supply machine according to the deviation signal received; Balanced loop PID controller exports the instruction of corresponding balance A Lateral supply motor and B Lateral supply electromechanics stream according to the deviation signal received.
Employing is applicable to a system for the fired power generating unit air output control method of low-nitrogen oxide discharging, comprising: fired power generating unit A crosswind amount control system, fired power generating unit B crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system;
Fired power generating unit A side is connected with fired power generating unit A crosswind amount control system and fired power generating unit B crosswind amount control system respectively with B Lateral supply machine current balance system;
A Lateral supply machine is sent into after the output valve of described fired power generating unit A crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system superposes; B Lateral supply machine is sent into after the output valve of described fired power generating unit B crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system superposes.
Described fired power generating unit A crosswind amount control system comprises: the first subtracter and A side PID controller are connected in series;
The measured value of fired power generating unit A side total blast volume and setting value input the first subtracter respectively and carry out doing poor process, and the output of the first subtracter is connected with A side PID controller.
Described fired power generating unit B crosswind amount control system comprises: the second subtracter and B side PID controller are connected in series;
The measured value of fired power generating unit B side total blast volume and setting value input the second subtracter respectively and carry out doing poor process, and the output of the second subtracter is connected with B side PID controller.
Described fired power generating unit A side and B Lateral supply machine current balance system comprise: the 3rd subtracter and balanced loop PID controller are connected in series;
Fired power generating unit A Lateral supply electromechanics stream flows with B Lateral supply electromechanics and inputs into the 3rd subtracter respectively, and the output of the 3rd subtracter is connected with balanced loop PID controller.
Described first subtracter, the second subtracter or the 3rd subtracter replace with adder, get negative process accordingly to one of them in the signal of input first subtracter, the second subtracter or the 3rd subtracter.
The invention has the beneficial effects as follows:
(1) A side and B side arrange a PID regulating loop respectively, compared with sharing a PID regulating loop with the A side in original control program, B side, two PID controller can arrange different controling parameters, can meet the device characteristics difference of both sides pressure fan, improve control accuracy;
(2) running current of pressure fan represents the situation of exerting oneself of equipment, by the effect of balanced loop PID regulating loop, can the exerting oneself of autobalance both sides pressure fan, and avoid the inequality because exert oneself in both sides to impact the stable problem of boiler combustion.
Accompanying drawing explanation
Fig. 1 is the air output control method schematic diagram that the present invention is applicable to low-nitrogen oxide discharging fired power generating unit.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
Be applicable to a fired power generating unit air output control method for low-nitrogen oxide discharging, as shown in Figure 1, comprise the following steps:
(1) actual value of A side total blast volume is obtained by field measuring instrument, and after comparing with setting value, produce deviation signal feeding A side PID controller and carry out computing, wherein, setting value is inputted by operation personnel;
(2) actual value of B side total blast volume is obtained by field measuring instrument, and after comparing with setting value, produce deviation signal feeding B side PID controller and carry out computing, wherein, setting value is inputted by operation personnel;
(3) running current of A Lateral supply machine and the running current of B Lateral supply machine compare, and produce deviation signal feeding balanced loop PID controller and carry out computing, its operation result is added in the PID controller output of A side and B side respectively;
(4) A side PID controller exports and is superimposed with balanced loop PID and exports, and produces final A Lateral supply machine control instruction;
(5) B side PID controller exports and is superimposed with balanced loop PID and exports, and produces final B Lateral supply machine control instruction.
Such as: if the actual value of A side total blast volume is less than setting value, A Lateral supply current of electric is greater than B Lateral supply current of electric simultaneously, then A side PID controller exports the instruction increasing A side total blast volume, balanced loop PID controller exports the instruction reducing A Lateral supply current of electric, above-mentioned two instructions superpose, and finally obtain the control instruction of A Lateral supply machine.The control mode of B Lateral supply machine is also like this.
Employing is applicable to a system for the fired power generating unit air output control method of low-nitrogen oxide discharging, comprising: fired power generating unit A crosswind amount control system, fired power generating unit B crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system;
Fired power generating unit A side is connected with fired power generating unit A crosswind amount control system and fired power generating unit B crosswind amount control system respectively with B Lateral supply machine current balance system; A Lateral supply machine is sent into after the output valve of fired power generating unit A crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system superposes; B Lateral supply machine is sent into after the output valve of described fired power generating unit B crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system superposes.
Fired power generating unit A crosswind amount control system comprises: the first subtracter and A side PID controller are connected in series; The measured value of fired power generating unit A side total blast volume and setting value input the first subtracter respectively and carry out doing poor process, and the output of the first subtracter is connected with A side PID controller.
Fired power generating unit B crosswind amount control system comprises: the second subtracter and B side PID controller are connected in series; The measured value of fired power generating unit B side total blast volume and setting value input the second subtracter respectively and carry out doing poor process, and the output of the second subtracter is connected with B side PID controller.
Fired power generating unit A side and B Lateral supply machine current balance system comprise: the 3rd subtracter and balanced loop PID controller are connected in series; Fired power generating unit A Lateral supply electromechanics stream flows with B Lateral supply electromechanics and inputs into the 3rd subtracter respectively, and the output of the 3rd subtracter is connected with balanced loop PID controller.
Above-mentioned first subtracter, the second subtracter and the 3rd subtracter also with the arithmetic unit of other types, can be added with setting value after such as getting negative to the total blast volume of certain side; Or realized by software programming.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (7)
1. be applicable to a fired power generating unit air output control method for low-nitrogen oxide discharging, it is characterized in that, comprise the following steps:
(1), after the measured value of fired power generating unit A side total blast volume and setting value being carried out do difference, produce deviation signal and send into A side PID controller;
(2), after the measured value of fired power generating unit B side total blast volume and setting value being carried out do difference, produce deviation signal and send into B side PID controller;
(3), after the running current of the running current of fired power generating unit A Lateral supply machine and B Lateral supply machine being carried out doing difference, produce deviation signal and send into balanced loop PID controller;
(4) output of fired power generating unit A side PID controller is superposed with the output of balanced loop PID controller, produce final thermal motor A Lateral supply machine control instruction;
(5) output of fired power generating unit B side PID controller is superposed with the output of balanced loop PID controller, produce final thermal motor B Lateral supply machine control instruction.
2. a kind of fired power generating unit air output control method being applicable to low-nitrogen oxide discharging as claimed in claim 1, is characterized in that, described A side PID controller exports the regulating command of A Lateral supply machine according to the deviation signal received; B side PID controller exports the regulating command of B Lateral supply machine according to the deviation signal received; Balanced loop PID controller exports the instruction of corresponding balance A Lateral supply motor and B Lateral supply electromechanics stream according to the deviation signal received.
3. one kind adopts the system being applicable to the fired power generating unit air output control method of low-nitrogen oxide discharging as claimed in claim 1, it is characterized in that, comprising: fired power generating unit A crosswind amount control system, fired power generating unit B crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system;
Fired power generating unit A side is connected with fired power generating unit A crosswind amount control system and fired power generating unit B crosswind amount control system respectively with B Lateral supply machine current balance system;
A Lateral supply machine is sent into after the output valve of described fired power generating unit A crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system superposes; B Lateral supply machine is sent into after the output valve of described fired power generating unit B crosswind amount control system and fired power generating unit A side and B Lateral supply machine current balance system superposes.
4. a kind of system being applicable to the fired power generating unit air output control method of low-nitrogen oxide discharging as claimed in claim 3, it is characterized in that, described fired power generating unit A crosswind amount control system comprises: the first subtracter and A side PID controller are connected in series;
The measured value of fired power generating unit A side total blast volume and setting value input the first subtracter respectively and carry out doing poor process, and the output of the first subtracter is connected with A side PID controller.
5. a kind of system being applicable to the fired power generating unit air output control method of low-nitrogen oxide discharging as claimed in claim 3, it is characterized in that, described fired power generating unit B crosswind amount control system comprises: the second subtracter and B side PID controller are connected in series;
The measured value of fired power generating unit B side total blast volume and setting value input the second subtracter respectively and carry out doing poor process, and the output of the second subtracter is connected with B side PID controller.
6. a kind of system being applicable to the fired power generating unit air output control method of low-nitrogen oxide discharging as claimed in claim 3, it is characterized in that, described fired power generating unit A side and B Lateral supply machine current balance system comprise: the 3rd subtracter and balanced loop PID controller are connected in series;
Fired power generating unit A Lateral supply electromechanics stream flows with B Lateral supply electromechanics and inputs into the 3rd subtracter respectively, and the output of the 3rd subtracter is connected with balanced loop PID controller.
7. a kind of system being applicable to the fired power generating unit air output control method of low-nitrogen oxide discharging as claimed in claim 3, it is characterized in that, described first subtracter, the second subtracter or the 3rd subtracter replace with adder, get negative process accordingly to one of them in the signal of input first subtracter, the second subtracter or the 3rd subtracter.
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