CN113883494A - Coal-fired power plant condensate pump frequency conversion decoupling control system and method - Google Patents
Coal-fired power plant condensate pump frequency conversion decoupling control system and method Download PDFInfo
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- CN113883494A CN113883494A CN202110949619.7A CN202110949619A CN113883494A CN 113883494 A CN113883494 A CN 113883494A CN 202110949619 A CN202110949619 A CN 202110949619A CN 113883494 A CN113883494 A CN 113883494A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 267
- 239000003245 coal Substances 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 75
- 230000005032 impulse control Effects 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 abstract description 8
- 238000010168 coupling process Methods 0.000 abstract description 8
- 238000005859 coupling reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000009530 blood pressure measurement Methods 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 230000001808 coupling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Feedback Control In General (AREA)
Abstract
The utility model provides an energy-saving coal fired power plant condensate pump frequency conversion decoupling control system, includes: the system comprises a condenser, a condensed water variable frequency pump, a deaerator, a boiler, a deaerator water level main and auxiliary adjusting valve, a pressure transmitter, a water level transmitter, a flow transmitter and a DCS control device; the DCS control device comprises a terminal board, a connecting cable, an analog quantity clamping piece, a channel back board and a main controller, wherein the main controller comprises a logic module used for carrying out logic operation on received signals. The invention further comprises a frequency conversion decoupling control method of the condensate pump of the coal-fired power plant based on the system. The invention effectively eliminates the mutual coupling between the control loops of the condensed water system, realizes the whole-process cooperative control of the deaerator water level and the condensed water mother pipe pressure, enhances the disturbance resistance and the interference resistance of the automatic control of the condensed water system, greatly reduces the throttling loss and the plant power consumption rate of the system, and obtains the optimal control performance and the optimal energy-saving effect.
Description
Technical Field
The invention relates to a frequency conversion decoupling control system of a condensate pump of a coal-fired power plant, and further relates to a frequency conversion decoupling control method of the condensate pump of the coal-fired power plant based on the system.
Background
The condensate system of the coal-fired power plant is a main auxiliary system of the power plant and is used for conveying condensate in a hot well of a condenser to a deaerator and providing temperature-reduced water, sealing water, cooling water and the like for related equipment. Under traditional condensate pump frequency conversion control strategy, because there is strong coupling effect between oxygen-eliminating device water level control and the condensate header pressure control, so still have following problem and lead to the energy-conserving effect of condensate system not good or economic benefits not good:
firstly, the throttling loss is large, the water level of the deaerator is completely and cooperatively regulated and controlled by the main regulating valve and the auxiliary regulating valve in the normal operation stage (particularly with high load) of the unit, and the control mode cannot ensure that the deaerator water level regulating valve is fully opened in the deaerator water level regulation process to generate a large amount of throttling loss.
Secondly, the unit efficiency is low, the pressure of the condensate water main pipe is regulated by the frequency converter of the condensate pump at a constant pressure, and in the load changing process of the unit, the condensate water pressure is completely set manually and cannot be regulated automatically in the whole process, so that the unit efficiency is reduced.
Thirdly, the stability is controlled to be poor, and in a high-load stage, a strong coupling effect exists between the deaerator water level regulation control loop and the condensate header pressure regulation control loop, which mainly shows that when a condensed water pump frequency converter instruction is increased, the deaerator water level is increased, and meanwhile, the condensate header pressure is also increased; to maintain the condensate header pressure, the regulating valve is opened wide, which in turn causes the deaerator water level to continue to rise, causing the condensate pump inverter command to decrease. The deaerator water level control loop and the condensate header pressure control loop are double-variable strong coupling control systems, and the two control loops are in cross coupling and mutual influence, so that the disturbance resistance and the anti-interference capability of automatic control of the condensate pump are reduced, and the reliability and the stability of the control system are deteriorated.
In order to improve the control performance and the energy-saving effect of the condensate system, the existing control strategy of the condensate system needs to be changed, the mutual coupling between control loops is eliminated by applying a new frequency conversion decoupling control strategy of the condensate pump and a logic configuration required by control, the reliability and the stability of the condensate pump control system are ensured, and the energy-saving effect of the condensate system is enhanced.
Disclosure of Invention
The invention aims to solve the first technical problem and provides a frequency conversion decoupling control system of a condensate pump of a coal-fired power plant.
The invention aims to solve the second technical problem and provides a coal-fired power plant condensate pump frequency conversion decoupling control method based on the system.
By adopting the system and the method, the decoupling control optimization is carried out on the frequency conversion control logic of the condensate pump by utilizing a feedforward compensation method, the mutual coupling between control loops can be effectively eliminated, the full-process cooperative control of the deaerator water level and the condensate header pressure is realized and kept stable, and the disturbance resistance and mutual disturbance resistance of the automatic control of the condensate system are enhanced; meanwhile, the throttling loss and the plant power consumption rate of the system are effectively reduced, a good energy-saving effect is obtained, and the control strategy and the optimization idea also provide reference for the frequency conversion control optimization of the condensate pumps of the same type of units.
To solve the first technical problem, the technical solution adopted by the present invention is as follows:
the utility model provides a coal fired power plant condensate pump frequency conversion decoupling control system which characterized by includes in proper order with the pipeline intercommunication:
a condenser 1 for condensing the steam discharged from the steam turbine of the coal-fired power plant and recovering pure condensed water to provide boiler feed water;
three condensed water variable frequency pumps 2 which are connected in parallel and used for controlling the pressure of the condensed water mother pipe and the water level of the deaerator behind the condensed water variable frequency pumps;
a controllable pressure transmitter 3 for measuring the condensate header pressure;
the auxiliary regulating valve 4 and the main regulating valve 5 are used for controlling the water level of the deaerator and the pressure of the condensate header;
a deaerator inlet flow transmitter 6 for measuring the flow of condensate entering the deaerator 7;
a deaerator 7 for removing oxygen and other non-condensable gases in the boiler feed water to ensure the quality of the boiler feed water;
a main feedwater flow transmitter 9 for measuring the feedwater flow into the boiler 10;
a boiler 10 for heating the main feed water in the pipe line by burning fuel to make supersaturated steam for operating the turbine;
the deaerator is provided with a deaerator water level transmitter 8 for measuring the deaerator water level;
and a DCS control device 11 for receiving the measurement signal transmitted by the field transmitter, processing and converting the measurement signal and carrying out logical operation on the measurement signal, and then outputting an instruction signal to control the three condensed water variable frequency pumps 2, the deaerator water level secondary regulating valve 4 and the main regulating valve 5.
The DCS control device 11 further includes: an input terminal board NTAI 05201 used for connecting signal cables of the condensate header pressure transmitter 3, the deaerator inlet flow transmitter 6, the deaerator water level transmitter 8 and the boiler main feed water flow transmitter 9 and receiving output electric signals; a connecting cable NKTU 01202 for transmitting the electric signal inputted to the terminal board NTAI 05201 to the card; the analog quantity input card element FEC 12203 is used for receiving the electric signals transmitted by the connecting cable NKTU 01202 and converting the electric signals into digital signals; the channel back plate MMU 22204 is used for transmitting the digital signals output by the analog input card FEC 12203; a main controller SP BRC 400205 for receiving digital signals passed by the backplane MMU 22204; a logic block 206 loaded in the processing main controller SP BRC 400205 for performing logic operation on the received signal; an analog output card ASO 11207 used for converting the command signal of the main controller SP BRC 400205 into a standard electric signal and transmitting the standard electric signal; the connecting cable NKTU 01208 is used for transmitting the electric signal of the analog output clamping piece ASO 11207 to a terminal board; and an output terminal board NTDI 01209 used for transmitting the control instruction signal to the condensed water frequency conversion pump 2, the deaerator water level auxiliary adjusting valve 4 and the deaerator water level main adjusting valve 5 through a signal cable.
The main controller SP BRC 400205 comprises a logic module 206, the logic module 206 comprises a plurality of PID modules, an addition module, a plurality of switching output modules, a plurality of H/L blocks, a plurality of instruction function blocks and a manual setting constant block, and the connection mode is as follows:
the unit load signal is judged and output by a first H/L block 20609 and then is connected to a judgment interface of a first switching module 20606, a deaerator water level signal (LT) and a water level setting Signal (SP) are input to a first PID block 20601 to form a single impulse control loop which takes the deaerator water level as a feedback signal, the first PID controller outputs a signal to an input Y interface of the first switching module 20606 according to the deviation of a deaerator water level measured value (LT) and a set value (SP), a manual setting constant block 20615 is connected to an input N interface of the first switching module 20606, and the first switching module 20606 outputs a relevant signal to a first instruction function block 20612 after load judgment to be used as a control instruction of a deaerator water level secondary regulating valve;
the unit load signal is also judged and output by the second H/L block 20610 and then connected to the judgment interface Y of the second switching module 20607, the deaerator water level signal (LT) and the water level setting Signal (SP) are also input to the second PID block 20602, the deviation of the two signals is output by the second PID controller and the boiler main feed water Flow (FW) as a feed-forward signal is connected to the addition module 20605, the two signals are added together to be used as a deaerator inlet flow set value and a deaerator inlet flow measured value (CNDFW) and then output to the fourth PID block 20604 to form a three-impulse control loop jointly involved by the deaerator water level, the boiler main feed water flow and the deaerator inlet flow, the fourth PID block 20604 is sequentially connected to the input Y interface and the second instruction function block 20613 of the second switching module 20607, and is output as a deaerator water level main regulating control command after load judgment, and simultaneously (simultaneously), but is output in different situations after condition judgment) the fourth PID block 20604 is sequentially connected to the input Y interface of the third switching module 20608 and the third command function block 20614, and is output as a control command of the frequency converter of the condensate pump after load judgment;
the unit load signal is also judged and output by a third H/L block 20611 and then connected to a judgment interface of a third switching module 20608, a condensate header pressure signal (PRSPV) and a pressure setting signal (PRSSP) are connected to a third PID block 20603 to form a single impulse control loop using the condensate header pressure as a feedback signal, the third PID controller outputs a signal to an input N interface of the second switching module 20607 according to the deviation between a condensate header pressure measurement value (PRSPV) and a set value (PRSSP), the signal is connected to a second command function block 20613 as a control command of a deaerator water level main regulator through load judgment output, and the third PID block 20603 outputs a signal to the input N interface of the third switching module 20608 and is connected to a third command function block 20614 as a control command of a condensate pump frequency converter through load judgment output.
The model of the condensate header pressure transmitter 3 is EJA530A-DCS4N-02DE, the measuring range is 0-3.5MPa, and the output is 4-20mA DC;
the deaerator water level auxiliary regulating valve 4 and the main regulating valve 5 are provided with split type intelligent single-action positioners with the model number of TZIDC-V18345-7010161001;
the model of the deaerator inlet flow transmitter 6 is EJA110E-DMS5J-719DC, the measuring range is 0-100kPa, and the output is 4-20mA DC;
the model of the deaerator water level transmitter 8 of the deaerator water level is EJA110A-DMS5A-22DC, the measuring range is 0-21kPa, and the output is 4-20mA DC;
the model of the boiler main feed water flow transmitter 9 is EJA130A-DMS5Z-22DC, the measuring range is 0-100kPa, and the output is 4-20mA DC;
to solve the second technical problem, the frequency conversion decoupling control method of the condensate pump of the coal-fired power plant based on the system of the invention comprises the following steps:
when the load of the unit is less than 20% of rated load (200MW), the deaerator water Level (LT) is controlled by a deaerator water level auxiliary regulating valve 4, a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to a first PID block 20601 to form a single impulse control loop which takes the deaerator water level as a feedback signal, the first PID controller calculates an output signal to an input Y interface of a first switching module 20606 according to the deviation of a deaerator water level measured value (LT) and the setting value (SP), when the load is lower than 20% of rated load, the output of the first switching module 20606 tracks the output signal of the first PID block 20601 of the input Y interface and is used as a control instruction 20612 of the deaerator water level auxiliary regulating valve 4, namely, the deaerator water Level (LT) is controlled by the deaerator water level auxiliary regulating valve 4 in a single impulse manner;
when the unit load is greater than 20% rated load (200MW) and less than 38% rated load (380MW), the deaerator water Level (LT) is controlled by the deaerator water level primary regulating valve 5, the output of the first switching module 20606 tracks the manual setting constant module (a)20615 input to the N interface, and a is 0, that is, the control instruction of the deaerator water level secondary regulating valve is 0; a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to a second PID block 20602, the deviation of the deaerator water level signal (LT) and the water level setting Signal (SP) is regulated and output by a PID controller and is connected to an addition module 20605 as a boiler main feed water Flow (FW) serving as a feed-forward signal, the two are added to serve as a deaerator inlet flow set value and a deaerator inlet flow measured value (CNDFW) and are connected to a fourth PID block 20604 for deviation calculation, a three-impulse control loop jointly participated by three signals of deaerator water level, boiler main feed water flow and deaerator inlet flow is formed, the output of the fourth PID block 20604 is connected to an input Y interface of a second switching module 20607, when the unit load is greater than 20% of the rated load and less than 38% of the rated load, the output of the second switching module 20607 tracks the output signal of the fourth PID block 20604 of the input Y interface, and the output signal is used as a control command 20613 of the deaerator water level main regulating valve 5, namely, the deaerator water Level (LT) is subjected to three-impulse control regulation by a deaerator water level main regulating valve 5;
when the unit load is greater than 38% of rated load (380MW), the deaerator water Level (LT) is controlled by the condensed water variable frequency pump 2, the condensed water bus pressure (PRSPV) is controlled by the deaerator water level main regulating valve 5, the output of the second switching module 20607 tracks the output signal of the third PID block 20603 of the input N interface, the condensed water bus pressure signal (PRSPV) and the pressure setting signal (PRSSP) are connected to the third PID block 20603, a single impulse control loop using the condensed water bus pressure as a feedback signal is formed, and the PID controller calculates an output signal to the input N interface of the second switching module 20607 according to the deviation between the condensed water bus pressure measured value (PRSPV) and the set value (PRSSP), and uses the output signal as the control command of the deaerator water level main regulating valve; a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to a second PID block 20602, the deviation of the deaerator water level signal (LT) and the water level setting Signal (SP) is regulated and output by a PID controller and is connected to an addition module 20605, the two are added and then are connected to a fourth PID block 20604 as a deaerator inlet flow set value and a deaerator inlet flow measured value (CNDFW) for deviation calculation, a three-impulse control loop jointly participating in the deaerator water level, the boiler main water flow and the deaerator inlet flow is formed, the fourth PID block 20604 outputs and is connected to an input Y interface of a third switching module 20608, when the unit load is more than 38% of rated load, the output of the third switching module 20608 tracks the output signal of the fourth PID block 20604 input into the Y interface and is used as a control total command 20614 of the three condensed water variable frequency pumps 2, namely, the deaerator water Level (LT) is subjected to three-impulse control regulation by the condensed water variable frequency pumps 2, the condensate header pressure (PRSPV) is controlled by a deaerator water level main regulating valve 5 with a single flushing.
When the unit load is less than 38% of the rated load (380MW), the condensate header pressure (PRSPV) is controlled by the condensate variable frequency pump 2, the condensate header pressure signal (PRSPV) and the pressure setting signal (PRSSP) are connected to the third PID block 20603, which constitutes a single impulse control loop with the condensate header pressure as a feedback signal, the PID controller calculates an output signal to the input N port of the third switching module 20608 according to the deviation of the condensate header pressure measurement value (PRSPV) and the setting value (PRSSP), when the unit load is less than 38% of the rated load, the output of the third switching module 20608 tracks the output signal of the third PID block 20603 of the input N port, which is used as a control command of the condensate variable frequency pump 2, i.e., the condensate header pressure signal (PRSPV) is single impulse control regulated by the condensate variable frequency pump 2.
The control idea is that the condensate variable frequency pump 2, the deaerator water level secondary regulating valve 4 and the deaerator water level main regulating valve 5 cooperatively control the deaerator water Level (LT) and the condensate header pressure (PRSPV) according to the whole logic 206 process in each load section of the unit according to the performance characteristics of the deaerator water level regulating valves (4, 5) and the condensate pump 2 in variable frequency regulation, so that the deaerator water Level (LT) and the condensate header pressure (PRSPV) are kept stable, the deaerator water level main regulating valve 5 of the unit is kept fully open in the high load stage, and the throttling loss is minimum; the frequency conversion rotating speed of the condensate pump 2 is kept to be the lowest in the low-load stage, and the power consumption of a condensate pump motor is the smallest, so that the optimal control performance and the optimal energy-saving effect are achieved.
Has the advantages that: the invention designs a new energy-saving control strategy and logic configuration for a condensate system by using a feedforward compensation method, and has the main advantages that:
1) the water level of the deaerator and the pressure of the condensate water mother pipe are automatically adjusted in the whole process through frequency conversion control of the condensate pump, so that the automatic control efficiency of the unit is improved, and the operation intensity and pressure of operators are reduced;
2) the decoupling control of the condensate pump is carried out by utilizing a feedforward compensation method, so that the mutual coupling between control systems is effectively eliminated, the disturbance resistance and the anti-interference capability of automatic control of the condensate system are realized, and the reliability and the stability of the implementation of frequency conversion control of the condensate pump are ensured;
3) by frequency conversion decoupling adjustment of the condensate pump, throttling loss and station service power consumption of the system are effectively reduced, control performance of the system is improved, and good adjustment quality and optimal energy-saving effect are obtained.
Drawings
The invention is described in further detail below with reference to the following figures and specific examples:
FIG. 1 is one of the schematic diagrams of the composition and connection relationship of the frequency conversion decoupling control system of the condensate pump of the coal-fired power plant;
FIG. 2 is a second schematic diagram of the composition and connection relationship of the frequency conversion decoupling control system of the condensate pump of the coal-fired power plant;
FIG. 3 is a third schematic diagram of the composition and connection relationship of the frequency conversion decoupling control system of the condensate pump of the coal-fired power plant.
Description of reference numerals:
1-a condenser, 2-a condensed water frequency conversion pump, 3-a condensed water busbar pressure transmitter, 4-a deaerator water level secondary regulating valve with a split intelligent single-action positioner, 5-a deaerator water level main regulating valve with a split intelligent single-action positioner, 6-a deaerator inlet flow transmitter, 7-a deaerator, 8-a deaerator water level transmitter, 9-a boiler main water supply flow transmitter, 10-a boiler and 11-a DCS control device;
201-input daughter boards NTAI05, 202-first connecting cables NKTU01, 203-analog input cards FEC12, 204-backplane MMU22, 205-main controller SP BRC400, 206-logic module, 207-analog output cards ASO11, 208-second connecting cables NKTU01, 209-output daughter board NTDI 01;
20601 to 20604-first to fourth proportional, integral and derivative control function modules (also called PID blocks), 20605-an addition module, 20606 to 20608-first to third switching output modules, 20609 to 20611-first to third high/low ratio comparison modules (also called H/L blocks), 20612 to 20614-first to third control command function output modules and 20615-a manual setting constant module.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and detailed description.
The system embodiment of the present invention as shown in fig. 1 to 3 comprises, in order, in communication by a pipeline: a condenser 1 for condensing steam discharged by a steam turbine of the coal-fired power plant and recovering pure condensed water to provide boiler feed water, three parallel condensed water pumps 2 with frequency converters for controlling the pressure of a condensed water main pipe and the water level of a deaerator behind the condenser, a pressure transmitter 3 for measuring the pressure of the condensed water main pipe installed on an outlet main pipe of the three condensed water pumps 2, a deaerator water level secondary regulating valve 4 and a deaerator water level main regulating valve 5 which are connected in parallel and used for controlling the water level of the deaerator and the pressure of the condensed water main pipe and provided with a split type intelligent single-action positioner, a deaerator inlet flow transmitter 6 installed on an inlet pipeline of the deaerator 7 and used for measuring the flow of the condensed water entering the deaerator 7, the deaerator 7 for removing oxygen and other non-condensed gases in the boiler feed water to ensure the quality of the boiler feed water, a main feed flow transmitter 9 for measuring the flow of the feed water entering the boiler 10, a control system for controlling the deaerator to control the pressure and the pressure of the condensed water main pipe, A boiler 10 for heating the main feed water in the pipeline into supersaturated steam for turning the turbine to operate by burning fuel, and a deaerator water level transmitter 8 arranged on the side of the deaerator 7.
And: and the DCS control device 11 is used for receiving the measurement signals transmitted by the condensate header pressure transmitter 3, the deaerator inlet flow transmitter 6, the deaerator water level transmitter 8 and the boiler main feed water flow transmitter 9, processing, converting and logically operating the measurement signals, and transmitting the final operation result to a production process control object (three condensate variable frequency pumps 2, the deaerator water level secondary regulating valve 4 and the main regulating valve 5) for control or monitoring by an operator station.
The circuit part in the DCS control device 11 of the present invention shown in fig. 2 includes: an input terminal board NTAI 05201 used for connecting signal cables of the condensate header pressure transmitter 3, the deaerator inlet flow transmitter 6, the deaerator water level transmitter 8 and the boiler main feed water flow transmitter 9 and receiving output electric signals; the first connecting cable NKTU 01202 is used for transmitting the electric signal of the input terminal board NTAI 05201 to the clamping piece; the analog quantity input card element FEC 12203 is used for receiving the electric signals transmitted by the connecting cable NKTU 01202 and converting the electric signals into digital signals; the channel back plate MMU 22204 is used for transmitting the digital signals output by the analog input card FEC 12203; a main controller SP BRC 400205 for receiving digital signals passed by the backplane MMU 22204; a logic block 206 loaded in the processing main controller SP BRC 400205 for performing logic operation on the received signal; an analog output card ASO 11207 used for converting the command signal of the main controller SP BRC 400205 into a standard electric signal and transmitting the standard electric signal; a second connecting cable NKTU 01208 for transmitting the electric signal of the analog output card ASO 11207 to the terminal board; and an output terminal board NTDI 01209 used for transmitting the control instruction signal to the condensed water frequency conversion pump 2, the deaerator water level auxiliary adjusting valve 4 and the deaerator water level main adjusting valve 5 through a signal cable.
The system logic module 206 of the present invention as shown in FIG. 3 includes: first to fourth PID blocks 20601, 20602, 20603, 20604, an addition block 20605, first to third switching output blocks 20606, 20607, 20608, first to third H/ L blocks 20609, 20610, 20611, first to third command function blocks 20612, 20613, 20614, a manual setting constant block 20615. The connection mode is as follows:
the unit load signal and the first H/L block 20609 are connected in sequence, the unit load signal and the first H/L block 20609 are connected to a judgment interface of the first switching module 20606 after being judged and output, a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to the first PID block 20601, a single impulse control loop which takes the deaerator water level as a feedback signal is formed, the PID controller outputs a signal to an input Y interface of the first switching module 20606 according to the deviation of a deaerator water level measured value (LT) and a set value (SP), the manual setting constant block 20615 is connected to an input N interface of the first switching module 20606, and the first switching module 20606 outputs a relevant signal to the first instruction function block 20612 after being subjected to load judgment to serve as a control instruction of a deaerator water level auxiliary regulating valve; a unit load signal and a second H/L block 20610 are connected in sequence, the unit load signal and the second H/L block 20610 are connected to a judgment interface of a second switching module 20607 after being judged and output, a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to a second PID block 20602, the deviation of the two signals is output through a PID controller and a boiler main feed water Flow (FW) serving as a feed-forward signal is connected to an addition module 20605, the two signals are added to serve as a deaerator inlet flow set value and a deaerator inlet flow measured value (CNDFW) and are connected to a fourth PID block 20604 together to form a three-impulse control loop jointly participating in the deaerator water level, the boiler main feed water flow and the deaerator inlet flow, the fourth PID block 20604 is connected to an input Y interface and a second instruction function block 20613 of the second switching module 20607 in sequence, the control instruction output of a deaerator main governor after being judged by load, and the fourth PID block 20604 is connected to an input Y interface and a third instruction function block 20614 of a third switching module 20608 in sequence, outputting the load as a total instruction of a frequency converter of the condensate pump after load judgment; the unit load signal and the third H/L block 20611 are connected in sequence, and after being judged and output, the unit load signal and the third H/L block 20611 are connected to a judgment interface of a third switching module 20608, a condensate header pressure signal (PRSPV) and a pressure setting signal (PRSSP) are connected to a third PID block 20603, so that a single impulse control loop with the condensate header pressure as a feedback signal is formed, the PID controller outputs a signal to an input N interface of the second switching module 20607 according to the deviation between a condensate header pressure measurement value (PRSPV) and a setting value (PRSSP), the signal is connected to a second command function block 20613 through the load judgment output and is used as a control command of a deaerator water level main regulating valve, and meanwhile, the third PID block 20603 outputs a signal to the input N interface of the third switching module 20608 and is connected to a third command function block 20614 through the load judgment output and is used as a total command of a condensate pump frequency converter.
Working process
Referring to fig. 1, a condensate header pressure transmitter 3 is installed on an outlet header of three condensate pumps 2 with frequency converters, and converts a measured condensate header pressure (PRSPV) into a direct current signal of 4 to 20mA based on a monocrystalline silicon resonance sensor, provides a direct current power supply (DC 24V) through a two-wire system, and outputs the electrical signal to a DCs control device 11; an deaerator inlet flow transmitter 6 is installed on an inlet pipeline of a deaerator 7, a boiler main water supply flow transmitter 9 is installed on an inlet water supply pipeline of a boiler 10, the two transmitters convert measured deaerator inlet flow (CNDFW) and boiler main water supply Flow (FW) into direct current signals of 4-20mA based on a differential pressure measurement principle, and output the electrical signals to a DCS control device 11 in a two-wire wiring mode; the deaerator water level transmitter 8 is installed on the side face of the deaerator 7, measures the deaerator water Level (LT) by utilizing the principle that static pressure changes caused by liquid level difference, converts a water level signal into a 4-20mA direct current signal and outputs the direct current signal to the DCS control device 11 in a two-wire wiring mode.
Referring to fig. 2, signal cables of a terminal board NTAI 05201 in a control system are connected with a condensate header pressure transmitter 3, a deaerator inlet flow transmitter 6, a deaerator water level transmitter 8 and a boiler main feed water flow transmitter 9 in a positive-positive and negative-negative mode through a two-wire connection mode, 4-20mA direct current signals are transmitted to an analog input card FEC 12203 through a first connection cable NKTU 01202, the analog input card FEC 12203 converts the electric signals into digital signals which can be received and identified by a controller SP BRC 400205, the analog input card FEC 12203 and a main controller SP BRC 400205 are inserted into slots of a back plate MMU 22204 and communicate through a back plate, the main controller SP BRC 400205 performs logic operation on the received signals through a logic module 206, an operation result is transmitted to an analog output card ASO 07 through the back plate MMU 22204 as a control instruction, and the analog output card ASO 11207 converts the instruction signals into 4-20mA direct current signals and transmits the direct current signals to an analog output card ASO 01207 through a second connection cable NKTU 08 And the board NTDI 01209 and the output terminal board NTDI 01209 are connected with the instruction signal cables of the condensate variable frequency pump 2, the deaerator water level secondary regulating valve 4 and the deaerator water level main regulating valve 5 in a positive-to-negative mode through a two-wire connection mode, and the control requirements of the deaerator water Level (LT) and the condensate header pressure (PRSPV) are realized according to the operation result of the logic module 206.
Referring to fig. 3, according to the connection mode of the logic modules in the figure, the control method of the energy-saving coal-fired power plant condensate pump frequency conversion decoupling based on the system specifically includes the following steps:
when the load of the unit is less than 20% of rated load (200MW), the deaerator water Level (LT) is controlled by a deaerator water level auxiliary regulating valve 4, a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to a first PID block 20601 to form a single impulse control loop with the deaerator water level as a feedback signal, the PID controller calculates an output signal to an input Y interface of a first switching module 20606 according to the deviation of a deaerator water level measured value (LT) and a set value (SP), when the load is lower than 20% of rated load, the output of the first switching module 20606 tracks the output signal of the first PID block 20601 input into the Y interface and is used as a control instruction 20612 of the deaerator water level auxiliary regulating valve 4, namely, the deaerator water Level (LT) is controlled by the deaerator water level auxiliary regulating valve 4 through single impulse.
When the unit load is greater than 20% rated load (200MW) and less than 38% rated load (380MW), the deaerator water Level (LT) is controlled by the deaerator water level primary regulating valve 5, the output of the first switching module 20606 tracks the manual setting constant module (a)20615 input to the N interface, and a is 0, that is, the control instruction of the deaerator water level secondary regulating valve is 0; a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to a second PID block 20602, the deviation of the deaerator water level signal (LT) and the water level setting Signal (SP) is regulated and output by a PID controller and is connected to an addition module 20605 as a boiler main feed water Flow (FW) serving as a feed-forward signal, the two are added to serve as a deaerator inlet flow set value and a deaerator inlet flow measured value (CNDFW) and are connected to a fourth PID block 20604 for deviation calculation, a three-impulse control loop jointly participated by three signals of deaerator water level, boiler main feed water flow and deaerator inlet flow is formed, the output of the fourth PID block 20604 is connected to an input Y interface of a second switching module 20607, when the unit load is greater than 20% of the rated load and less than 38% of the rated load, the output of the second switching module 20607 tracks the output signal of the fourth PID block 20604 of the input Y interface, and the output signal is used as a control command 20613 of the deaerator water level main regulating valve 5, namely, the deaerator water Level (LT) is subjected to three-impulse control regulation by a deaerator water level main regulating valve 5.
When the unit load is greater than 38% of rated load (380MW), the deaerator water Level (LT) is controlled by the condensed water variable frequency pump 2, the condensed water bus pressure (PRSPV) is controlled by the deaerator water level main regulating valve 5, the output of the second switching module 20607 tracks the output signal of the third PID block 20603 of the input N interface, the condensed water bus pressure signal (PRSPV) and the pressure setting signal (PRSSP) are connected to the third PID block 20603, a single impulse control loop using the condensed water bus pressure as a feedback signal is formed, and the PID controller calculates an output signal to the input N interface of the second switching module 20607 according to the deviation between the condensed water bus pressure measured value (PRSPV) and the set value (PRSSP), and uses the output signal as the control command of the deaerator water level main regulating valve; a deaerator water level signal (LT) and a water level setting Signal (SP) are connected to a second PID block 20602, the deviation of the deaerator water level signal (LT) and the water level setting Signal (SP) is regulated and output by a PID controller and is connected to an addition module 20605, the two are added and then are connected to a fourth PID block 20604 as a deaerator inlet flow set value and a deaerator inlet flow measured value (CNDFW) for deviation calculation, a three-impulse control loop jointly participating in the deaerator water level, the boiler main water flow and the deaerator inlet flow is formed, the fourth PID block 20604 outputs and is connected to an input Y interface of a third switching module 20608, when the unit load is more than 38% of rated load, the output of the third switching module 20608 tracks the output signal of the fourth PID block 20604 input into the Y interface and is used as a control total command 20614 of the three condensed water variable frequency pumps 2, namely, the deaerator water Level (LT) is subjected to three-impulse control regulation by the condensed water variable frequency pumps 2, the condensate header pressure (PRSPV) is controlled by a deaerator water level main regulating valve 5 with a single flushing.
When the unit load is less than 38% of the rated load (380MW), the condensate header pressure (PRSPV) is controlled by the condensate variable frequency pump 2, the condensate header pressure signal (PRSPV) and the pressure setting signal (PRSSP) are connected to the third PID block 20603, which constitutes a single impulse control loop with the condensate header pressure as a feedback signal, the PID controller calculates an output signal to the input N port of the third switching module 20608 according to the deviation of the condensate header pressure measurement value (PRSPV) and the setting value (PRSSP), when the unit load is less than 38% of the rated load, the output of the third switching module 20608 tracks the output signal of the third PID block 20603 of the input N port, which is used as a control command of the condensate variable frequency pump 2, i.e., the condensate header pressure signal (PRSPV) is single impulse control regulated by the condensate variable frequency pump 2.
As a decoupling control principle applied in the invention, the feedforward compensation decoupling control mode is to design a decoupling controller based on an invariance principle, thereby eliminating the coupling relevance of a plurality of control systems and achieving the purpose of decoupling control on the control systems. As known from the control logic decoupled by the feedforward compensation method, the mutual coupling between the systems can be eliminated by utilizing the feedforward compensation method to carry out decoupling control, so that each system becomes an independent and unrelated control loop. Therefore, in a high-load stage, aiming at the strong coupling phenomenon between the deaerator water Level (LT) regulation and the condensate header pressure (PRSPV) regulation, the condensate pump frequency conversion regulation system can adopt a static feedforward compensation decoupling control mode to remove the coupling effect between the deaerator water Level (LT) regulation and the condensate header pressure (PRSPV) regulation, namely, the boiler main feed water Flow (FW) is adopted as a feedforward signal of the condensate pump 2 for frequency conversion control of the deaerator water Level (LT), and meanwhile, the condensate header pressure signal (PRSPV) is adopted for correction so as to achieve the decoupling control purpose.
Claims (9)
1. A frequency conversion decoupling control system of a condensate pump of a coal-fired power plant is characterized by comprising a condenser (1), three condensate frequency conversion pumps (2) connected in parallel, a controllable pressure transmitter (3), a deaerator water level auxiliary regulating valve (4) and a main regulating valve (5) connected in parallel, a deaerator inlet flow transmitter (6), a deaerator (7), a main feed water flow transmitter (9) and a boiler (10) which are sequentially communicated through a pipeline, wherein the deaerator is provided with a deaerator water level transmitter (8);
and the DCS control device (11) is used for receiving the measurement signals transmitted by the transmitters, carrying out processing conversion and logic operation on the measurement signals, and then outputting instruction signals to control the condensate variable-frequency pump, the deaerator water level secondary regulating valve and the main regulating valve.
2. The coal fired power plant condensate pump frequency conversion decoupling control system of claim 1, characterized by: the DCS control device (11) further comprises: an input terminal board NTAI05(201) for connecting signal cables of a condensate header pressure transmitter, a deaerator inlet flow transmitter, a deaerator water level transmitter and a boiler main feed water flow transmitter and receiving output electric signals of the signal cables, a connecting cable NKTU01(202) for transmitting the electric signals of an input terminal board NTAI05 to a card, an analog input card FEC12(203) for receiving the electric signals transmitted by the connecting cable NKTU01 and converting the electric signals into digital signals, a channel back plate MMU22(204) for transmitting the digital signals output by the analog input card FEC12, a main controller SP BRC400(205) for receiving the digital signals transmitted by the back plate MMU22, a logic module (206) loaded in the main controller SP BRC400 for carrying out logic operation on the received signals, an analog output ASO11(207) for converting command signals of the main controller SP BRC400 into standard electric signals and transmitting the standard electric signals, and the analog output card ASO11(207), The device comprises a connecting cable NKTU01(208) for transmitting an electric signal of an analog quantity output card ASO11 to a terminal board, and an output terminal board NTDI01(209) for transmitting a control command signal to a condensed water variable frequency pump, a deaerator water level secondary regulating valve and a deaerator water level main regulating valve through a signal cable.
3. The coal fired power plant condensate pump frequency conversion decoupling control system of claim 2, characterized by: the main controller SP BRC400(205) comprises a logic module (206), the logic module comprises a plurality of PID modules, an addition module, a plurality of switching output modules, a plurality of H/L blocks, a plurality of instruction function blocks and a manual setting constant block, and the connection mode is as follows:
the unit load signal is connected to a judgment interface of a first switching module (20606) after being judged and output by a first H/L block (20609), a deaerator water level signal (LT) and a water level setting Signal (SP) are input into a first PID block (20601) to form a single impulse control loop which takes the deaerator water level as a feedback signal, the first PID controller outputs a signal to an input Y interface of the first switching module according to the deviation of a deaerator water level measured value (LT) and a set value (SP), a manual setting constant block (20615) is connected to an input N interface of the first switching module, and the first switching module outputs a relevant signal to a first instruction function block (20612) after being judged by the load to be used as a control instruction of a deaerator water level secondary regulating valve.
4. The coal fired power plant condensate pump frequency conversion decoupling control system of claim 3, characterized by: the unit load signal is also judged and output by a second H/L block (20610) and then connected to a judgment interface of a second switching module (20607), a deaerator water level signal (LT) and a water level setting Signal (SP) are also input to a second PID block (20602), the deviation of the deaerator water level signal and the water level setting signal is output by a second PID controller and the main boiler feed water Flow (FW) serving as a feed-forward signal is connected to an addition module (20605), the two are added and then output to a fourth PID block (20604) as a set value of the deaerator inlet flow and an actual measurement value of the deaerator inlet flow, a three-impulse control loop jointly participating in the deaerator water level, the main boiler feed water flow and the deaerator inlet flow is formed, the fourth PID block is sequentially connected to an input Y interface of the second switching module and a second instruction function block (20613) and is output as a control instruction of the deaerator water level main control valve after load judgment, meanwhile, the fourth PID block is sequentially connected to an input Y interface of the third switching module (20608) and a third instruction function block (20614), and is output as a control instruction of the frequency converter of the condensate pump after load judgment.
5. The coal fired power plant condensate pump frequency conversion decoupling control system of claim 4, characterized by: the unit load signal is also connected to a judgment interface of a third switching module (20608) after being judged and output by a third H/L block (20611), a condensate header pressure signal and a pressure setting signal are connected to a third PID block (20603) to form a single impulse control loop with the condensate header pressure as a feedback signal, the third PID controller outputs a signal to an input N interface of a second switching module (20607) according to the deviation of a condensate header pressure measured value and a set value, the signal is connected to a second instruction function block (20613) through a load judgment output to serve as a control instruction of a deaerator water level main regulating valve, and meanwhile, the third PID block (20603) outputs a signal to an input N interface of the third switching module and is connected to a third instruction function block (20614) through a load judgment output to serve as a control instruction of a condensate pump frequency converter.
6. A coal-fired power plant condensate pump frequency conversion decoupling control method based on any one system of claims 1-5 is characterized by comprising the following steps:
when the load of the unit is less than 20% of rated load, the water level of the deaerator is controlled by a deaerator water level auxiliary regulating valve (4), a deaerator water level signal and a water level setting signal are connected to a first PID block (20601) to form a single impulse control loop taking the deaerator water level as a feedback signal, the first PID controller calculates an output signal to an input Y interface of a first switching module (20606) according to the deviation of a deaerator water level measured value and a set value, when the load is less than 20% of rated load, the output of the first switching module tracks the output signal of the first PID block input into the Y interface and serves as a control instruction (20612) of the deaerator water level auxiliary regulating valve, namely, the deaerator water level is controlled by the deaerator water level auxiliary regulating valve.
7. The coal-fired power plant condensate pump frequency conversion decoupling control method of claim 6, characterized by: when the unit load is greater than 20% of rated load and less than 38% of rated load, the deaerator water level is controlled by a deaerator water level main regulating valve (5), the output of a first switching module (20606) is input into a manual setting constant module (A) (20615) of an N interface in a tracking mode, and A is 0, namely the control instruction of the deaerator water level auxiliary regulating valve is 0; the deaerator water level signal and the water level setting signal are connected to a second PID block (20602), the deviation of the deaerator water level signal and the water level setting signal is regulated and output by a PID controller, the boiler main feed water flow serving as a feed-forward signal is connected to an addition module (20605), the two are added to be used as a set value of the deaerator inlet flow and an actual measurement value of the deaerator inlet flow and are connected to a fourth PID block (20604) together for deviation calculation, a three-impulse control loop which is jointly participated by three signals of the deaerator water level, the boiler main feed water flow and the deaerator inlet flow is formed, the output of the fourth PID block is connected to an input Y interface of a second switching module (20607), when the unit load is greater than 20% of rated load and less than 38% of rated load, the output of the second switching module tracks the output signal of the fourth PID block input into the Y interface and serves as a control instruction (20613) of the deaerator water level main regulating valve (5), namely the deaerator water level is subjected to three-impulse control regulation by the deaerator water level main regulating valve.
8. The coal-fired power plant condensate pump frequency conversion decoupling control method of claim 7, characterized by: when the unit load is greater than 38% of rated load, the deaerator water level is controlled by a condensed water variable frequency pump (2), the condensed water bus pressure is controlled by a deaerator water level main regulating valve, the output of a second switching module tracks the output signal of a third PID block (20603) of an input N interface, the condensed water bus pressure signal and a pressure setting signal are connected to the third PID block to form a single impulse control loop taking the condensed water bus pressure as a feedback signal, and a PID controller calculates an output signal to the input N interface of the second switching module according to the deviation of the measured value and the set value of the condensed water bus pressure and takes the output signal as a control command of the deaerator water level main regulating valve; the deaerator water level signal and the water level setting signal are connected to a second PID block, the deviation of the deaerator water level signal and the water level setting signal is regulated and output by a PID controller, the boiler main feed water flow serving as a feedforward signal is connected to an addition module (20605), the two are added and then are used as a set value of the deaerator inlet flow and an actual measurement value of the deaerator inlet flow to be connected to a fourth PID block for deviation calculation, a three-impulse control loop which is jointly participated by three signals of deaerator water level, boiler main feed water flow and deaerator inlet flow is formed, the output of the fourth PID block is connected to an input Y interface of a third switching module, when the load of the unit is greater than 38% of the rated load, the output of the third switching module tracks the output signal of the fourth PID block input to the Y interface and is used as a control total command (20614) of the three condensed water variable-frequency pumps, namely, the water level of the deaerator is subjected to three-impulse control regulation by a condensed water variable frequency pump, and the pressure of the condensed water main pipe is subjected to single-impulse control by a deaerator water level main regulating valve.
9. The coal-fired power plant condensate pump frequency conversion decoupling control method of claim 8, characterized by: when the load of the unit is less than 38% of the rated load, the pressure of the condensate header is controlled by a condensate variable frequency pump, a condensate header pressure signal and a pressure setting signal are input to a third PID block to form a single impulse control loop which takes the condensate header pressure as a feedback signal, a PID controller calculates an output signal to an input N interface of a third switching module according to the deviation of a condensate header pressure measured value and a set value, and when the load of the unit is less than 38% of the rated load, the output of the third switching module tracks the output signal of the third PID block which is input to the N interface and is used as a control instruction of the condensate variable frequency pump, namely, the condensate header pressure signal is subjected to single impulse control regulation by the condensate variable frequency pump.
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Application publication date: 20220104 |