CN111794934A - Method for changing steam feed pump system into full frequency conversion electric feed pump system and brand new logic control system thereof - Google Patents
Method for changing steam feed pump system into full frequency conversion electric feed pump system and brand new logic control system thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/003—Arrangements for measuring or testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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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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Abstract
The invention provides a method for changing a full frequency conversion electric water feeding pump system into a steam-driven water feeding pump system and a brand-new logic control system thereof, wherein the steam-driven water feeding pump system comprises a small steam turbine, a steam-driven water feeding pump control system DEH, a water feeding pump, a front pump motor and a front pump, the water feeding pump, the front pump motor and the front pump are jointly used as part of a rotating hardware structure of the changed full frequency conversion electric water feeding pump system, and the method comprises the following steps: removing a small steam turbine and a steam feed pump control system DEH in the steam feed pump system; the position of the original small steam turbine is provided with a driving motor and a speed-up gear box which are connected with each other, the speed-up gear box is in mechanical transmission connection with the water feeding pump, and the driving motor is connected with a signal and electric power output device in a modified brand-new logic control system through a high-voltage frequency converter. The changed brand new system is controlled and driven by using brand new calculation logic and control method, and the traditional method of calculating and controlling by using the water level of the steam drum is abandoned.
Description
Technical Field
The invention relates to the technical field related to a feed pump system of a power plant, in particular to a method for changing a steam feed pump system into a full frequency conversion electric feed pump system and a brand new logic control system for changing the steam feed pump system into the full frequency conversion electric feed pump system.
Background
At present, along with the deep development of energy saving and consumption reduction work of a power plant in deep peak shaving operation, the energy saving problem and the safe operation problem of a steam feed pump of a unit are increasingly emphasized, wherein in the actual operation of the power plant, the steam feed pump system is a water feed pump operation system dragged by a small steam turbine using high-pressure steam as power, and electric power output by the work of the generator unit is generated by dragging a generator to operate by a large steam turbine under the pushing of the steam. Usually, a feed pump directly dragged by a small turbine is also installed in the same floor where a large turbine is installed, and this is a steam feed pump system, and the "steam feed pump system" of a unit system unit is generally divided into two types according to the difference of rotating hardware under the control of a steam feed pump control system DEH: the first is that only one small turbine drives a 100% capacity feed pump to do work, and the second is that two small turbines each drive a 50% capacity feed pump to do work together. The two steam-driven feed water pump systems with different hardware structures use high-pressure steam of a power plant as the only power for driving a feed water pump to work (operate) by a small steam turbine.
However, in the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the operation regulation of the feed water pump system is completed by a control calculation method for regulating the water level of a boiler drum no matter a steam feed water pump system using steam as power (a small steam turbine and a feed water pump can only be arranged at the position of about 13 meters on the same layer as a large steam turbine to normally work according to the technical limitation) or an electric feed water pump system using an electric drive hydraulic coupler to regulate the speed (an electric feed water pump with liquid coupling to regulate the speed can only be arranged at the position of a zero meter layer to normally work according to the technical limitation). That is to say, the 'control system DEH of the steam feed pump system' and the 'control system of the electric feed pump system with speed regulated by the hydraulic coupler' both rely on the control logic calculation method of the DCS which specially regulates the water level of the boiler drum to complete the operation control work of the feed pump system.
It is known that in a steam-driven water supply pump system, when the rotating speed of a small turbine is lower than 70% of the rated rotating speed and below, the efficiency of the small turbine is greatly reduced, which causes more unstable factors of the system, increases the control difficulty in low-load operation and increases the fault rate. At present, the national power grid increases a lot of low-load operation time (from 50% load to 20% load) when adjusting the power generation of a power plant, and the low-load time causes the rotating speed of the small turbine to wander to between 50% and 20%, so that the difficulty of adjusting the steam supply of the small turbine and the consumption of the steam (the steam is generated after heating water by burning coal) are increased, namely the consumption of the coal and the consumption of the water during the power generation are increased. The safe rotating speed of the small turbine is usually set in the range of 40% of the rated rotating speed, and the long-term running range of the small turbine with the rotating speed lower than 40% brings insecurity, and seriously threatens the safety of a feed water pump system and the overall safe operation of a unit.
In addition, the main method of the 'water supply control' of the steam-driven water supply pump system is to realize the rough adjustment of the overheat steam temperature by meeting the water level requirement of a boiler drum so as to meet the response of a unit to the adjustment load change of a power grid AGC, and the difficulty that the accuracy and the quality of the water supply adjusting system and the actual operation safety are influenced by false water level and the like is easy to occur.
Disclosure of Invention
The invention provides a method for changing a steam-driven feed water pump system into a full-frequency-conversion electric feed water pump system and a brand-new logic control system thereof, aiming at solving the technical problems of higher energy consumption, lower efficiency, poorer accuracy and easy occurrence of operation safety faults in the prior art.
In view of the above, the present invention provides a method for modifying a full-frequency-conversion electric feed water pump system by a steam feed water pump system, where the steam feed water pump system includes a small steam turbine, a steam feed water pump control system DEH, a feed water pump, a pre-pump motor and a pre-pump, and the feed water pump, the pre-pump motor and the pre-pump together serve as a part of a rotating hardware structure of the modified full-frequency-conversion electric feed water pump system, and the method includes the following steps: dismantling a small steam turbine and a steam feed pump control system DEH in the steam feed pump system; the steam turbine is characterized in that a driving motor and a speed-up gear box which are connected with each other are installed at the original position of the small steam turbine, the speed-up gear box is in mechanical transmission connection with the water feeding pump, and the driving motor is connected with a signal and electric power output device in a brand-new logic control system after being modified through a high-voltage frequency converter.
According to a second aspect of the present invention, there is provided a full-variable frequency electric feedwater pump system modified from a steam-operated feedwater pump system, wherein parameters and signals of a grid AGC automatic generation control system, a DCS distributed control system, and a boiler control system are retained, further comprising: the method for changing the steam-driven water feeding pump system into the full-frequency-conversion electric water feeding pump system is characterized in that the full-frequency-conversion electric water feeding pump system is changed, three groups of independent pressure sensors, flow sensors and temperature sensors are respectively arranged on a main steam supply pipeline of the large steam turbine, a signal and electric power output device in a brand-new logic control system is connected with the high-voltage frequency converter, the high-voltage frequency converter is connected with the water feeding pump through the driving motor and the speed-increasing gear box in sequence, the water feeding pump is connected with the front pump and the front pump motor through pipelines in sequence, and the front pump motor is connected with the signal and electric power output device in the brand-new logic control system.
According to a third aspect of the present invention, there is provided a completely new logic control method for a full-frequency conversion electric feed water pump system, which retains parameters and signals of an automatic generation control system of a power grid AGC, a boiler control system and a DCS distributed control system, and further comprises a full-frequency conversion electric feed water pump system modified from the steam feed water pump system as described above, and several different sets of independent sensors added to a main steam supply pipeline of a large steam turbine, the method comprising: acquiring real-time pressure values monitored by each group of pressure sensors, real-time flow values monitored by the flow sensors and real-time temperature values monitored by the temperature sensors, and generating three groups of real-time operation values; acquiring boiler real-time operation parameters sent by a boiler control system and AGC real-time instruction values sent by a power grid AGC automatic generation control system, wherein the AGC real-time instruction values comprise a large turbine rotating speed instruction value and a large turbine load instruction value, and a total steam quantity set value is arranged in a main steam supply pipeline of a large turbine corresponding to the boiler real-time operation parameters; confirming a group of comparison operation values according to the three groups of real-time operation values, sequentially comparing the comparison operation values with a plurality of operation values on a preset operation value list, and confirming that the operation value with the minimum or equal difference value with the comparison operation values is the actual operation value of the boiler, wherein the operation value is a fixed factory-leaving set value generated by each device according to the use characteristics and specific use parameter values of the device during production and processing according to the requirements of a design drawing; acquiring a target total steam set value under an AGC real-time instruction according to the actual operation value of the boiler, the rotating speed instruction value of the large steam turbine, the load instruction value of the large steam turbine and the current steam quantity value in the main steam supply pipeline; acquiring a steam total amount difference according to the target steam total amount set value and a steam total amount actual value in a main steam supply pipeline under an AGC real-time instruction; acquiring a target total steam amount actual value according to the boiler real-time operation parameter, the large steam turbine load instruction value, the total steam amount difference and the target total steam amount set value; and generating and converting the target total amount actual value into a deceleration instruction or an acceleration instruction of a regulating high-voltage frequency converter, and finally controlling the operation of the water feeding pump.
In the technical scheme, three groups of independent data, namely three groups of real-time pressure values, real-time flow values and real-time temperature values, are obtained through three groups of pressure sensors, flow sensors and temperature sensors which are independently arranged on a main steam supply pipeline of a large steam turbine, one group of data which is respectively closest to an average value in the three groups of data is selected as a comparison operation value, the comparison operation value is sequentially compared with a plurality of operation values on a preset operation value list to confirm a corresponding actual operation value of the boiler, then a target total steam quantity set value is obtained according to the actual operation value of the boiler, a rotating speed instruction value of the large steam turbine, a load instruction value of the large steam turbine and a current steam quantity value in the main steam supply pipeline, a total steam quantity difference is obtained according to the target total steam quantity set value and the actual steam quantity value in the main steam supply pipeline under an AGC real-time instruction, acquiring a target total steam quantity actual value by the load instruction value of the large steam turbine, the steam total quantity difference and the target total steam quantity set value, generating and converting the actual value of the target total amount into a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter, finally, the operation of the feed pump is controlled, the variable-frequency operation of the feed pump is rapidly and accurately controlled, the real-time accuracy of a water supply system of a unit in various load, particularly low-load operation intervals is enhanced, the efficiency is improved, the working deviation of the water supply system is avoided, the speed of a large steam turbine under the response of an AGC instruction is greatly improved, the problem that the water supply quantity can only be adjusted according to a calculation method of the water level of a boiler drum in the prior art, the water supply deviation and the low responsiveness caused by various factors such as false water level and load disturbance cannot be avoided in the prior art is effectively avoided, and the safety of the water supply pump system is improved.
In any one of the above technical solutions, preferably, the specific step of obtaining a target total steam amount set value according to the actual boiler operation value, the large turbine rotation speed instruction value, the large turbine load instruction value, and the current steam quantity value in the main steam supply pipeline includes: acquiring an actual rotating speed value of the large steam turbine according to a current steam quantity value in a main steam supply pipeline of the large steam turbine; acquiring a regulating stage pressure set value of a main steam supply pipeline of the large steam turbine and a reheater outlet pressure set value according to the actual rotating speed value of the large steam turbine and the rotating speed instruction value of the large steam turbine under the AGC real-time instruction; acquiring a total steam quantity set value in a main steam supply pipeline of the large steam turbine according to the load instruction value of the large steam turbine; acquiring a deviation value between the total steam quantity set value and the current steam quantity value in the main steam supply pipeline; acquiring a target steam total amount set value according to the regulating stage pressure set value, the reheater outlet pressure set value and the deviation value, wherein the target steam total amount set value is represented by a formula PS (K)RP1Determining a + Δ P, where PS is the target steam total setting, KRAt hundred percent load said reheater outletA set port pressure, P1, is the set regulation stage pressure for the large turbine, and Δ P is the deviation.
In the technical scheme, the current steam value in a main steam pipeline of the large steam turbine comprises the actual rotating speed of the large steam turbine in a set rule, namely the actual rotating speed value of the large steam turbine is obtained according to the current steam value in a main pipeline of the large steam turbine, the actual rotating speed value meets the rotating speed required by a real-time instruction value on an automatic generation control system of the power grid AGC, namely the high-temperature high-pressure steam is used for pushing the large steam turbine to rotate so as to reach the rotating speed required by the automatic generation control system of the power grid AGC to drive the generator to rotate so as to complete power generation and work; then, acquiring a regulating stage pressure set value and a reheater outlet pressure set value of the large steam turbine according to the next step load and new rotating speed instruction value of the AGC and the current actual rotating speed value, wherein the reheater outlet pressure set value is a pressure set value when the reheater outlet is subjected to hundred percent load, acquiring a steam total amount set value in a main steam supply pipeline of the large steam turbine according to the large steam turbine load instruction value, and the steam total amount set value is a steam total amount value actually required by the electric water supply pump system for producing a site under the load instruction of the power grid AGC automatic power generation control system; then obtaining a deviation value between a total steam set value and a current steam quantity value in a main steam supply pipeline, wherein the deviation value is a difference between the total steam set value and a steam quantity set under a real-time instruction of a power grid AGC automatic generation control system; and then acquiring a target steam total amount set value according to the regulating stage pressure set value, the reheater outlet pressure set value and the deviation value, wherein the target steam total amount set value is represented by a formula PS (K)RP1And determining the +/-delta P.
In any one of the above technical solutions, preferably, the specific step of obtaining the steam total amount difference according to the target steam total amount set value and the actual steam total amount value in the main steam supply pipeline of the large steam turbine includes: acquiring an actual value of the total steam quantity in the main steam pipeline according to the set value of the regulation stage pressure and the value of the primary steam extraction pressure, wherein the actual value of the total steam quantity is obtained by a formula
Determining, wherein D is the actual value of the total amount of steam in the main steam pipeline, P1Is the set value of the pressure of the regulating stage, P, of the large steam turbine2The first-stage extraction pressure value is set, and a and b are set values; obtaining the steam total amount difference according to the target steam total amount set value and the steam total amount actual value, wherein the steam total amount difference is obtained by a formula
And determining, wherein Y is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value, PS is the target total steam quantity set value, and D is the actual total steam quantity value in the main steam pipeline.
In the technical scheme, the actual value of the total steam quantity in the main steam pipeline is obtained by adjusting the set value of the stage pressure and the pressure value of the stage extraction steam, and the actual value of the total steam quantity is calculated by a formula
Determining that the actual value of the total steam quantity is the current value of the main steam flow in the main steam supply pipeline of the large steam turbine on the production site; then, the steam total amount difference is obtained through the target steam total amount set value and the steam total amount actual value, and the steam total amount difference is calculated through a formula
And determining that the total steam quantity difference is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to a real-time instruction of a power grid AGC automatic generation control system.
In any one of the above technical solutions, preferably, the specific step of obtaining the actual value of the total amount of target steam according to the real-time operating parameter of the boiler, the load instruction value of the large steam turbine, the difference of the total amount of steam, and the set value of the total amount of target steam includes: acquiring a comprehensive load instruction value of the boiler according to the real-time operating parameters of the boiler and the load instruction value of the large steam turbine; carrying out nonlinear processing on the boiler comprehensive load instruction value, wherein the processed value is generated in real time by the boilerAdding the steam total value and the steam total difference to obtain the sum of the steam total value and the steam total difference, wherein the sum is used as a target steam total actual value under an AGC new instruction, and the target steam total actual value is expressed by a formula
Determining, wherein W is the actual value of the target total steam quantity, and H is the value of the total steam quantity generated by the boiler in real time, namely, the comprehensive load instruction value of the boiler is subjected to a nonlinear function f1(x) And converting, wherein Y is the total steam quantity difference which must be met in the main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value.
In the technical scheme, a boiler comprehensive load instruction value is obtained through boiler real-time operation parameters and a large steam turbine load instruction value, namely the boiler load instruction value output by a boiler control system is superposed with the large steam turbine load instruction value sent by a power grid AGC automatic power generation control system to serve as the boiler comprehensive load instruction value, and the boiler comprehensive load instruction value is processed by a nonlinear function f1(x) Converting into instantaneous boiler evaporation load value, i.e. the steam total value H generated by the boiler in real time, and then superposing the steam total value H and the steam total difference, i.e. by formula
And determining and acquiring a target total steam quantity actual value, namely the required total steam quantity of the next step of the large steam turbine.
In any one of the above technical solutions, preferably, the specific step of generating and converting the target total amount actual value into a deceleration command or an acceleration command for regulating and controlling the high-voltage inverter and finally controlling the operation of the feed water pump includes: acquiring a numerical value corresponding to each Hertz working frequency preset by the high-voltage frequency converter and a steam maximum supply quantity list; acquiring list data corresponding to each Hz under corresponding working frequency in the list according to the model and frequency requirements of the high-voltage frequency converterSetting the working frequency to be 50Hz, and acquiring actual list data of steam supply amount corresponding to each Hz of the high-voltage frequency converter under the working frequency of 50 Hz; acquiring a maximum use value of the total steam volume of the large steam turbine under the maximum work; generating and converting a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter according to the actual list data, the maximum total steam amount utilization value and the actual target steam amount value, wherein the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage frequency converter, and the target working frequency value is represented by a formula
Wherein G is the target working frequency value, W is the target steam total actual value, E is the maximum use value of the total steam amount, and S is the actual list data; and controlling the feed pump driving motor to drive the feed pump to rotate and operate according to the rotating speed received by the high-voltage frequency converter under the target working frequency through the speed-up gear box.
In the technical scheme, a list corresponding to each Hertz working frequency preset by a high-voltage frequency converter and steam supply quantity is obtained, then list data corresponding to each Hertz under the corresponding working frequency in the list is obtained according to the type and frequency requirements of the high-voltage frequency converter, wherein the working frequency of the high-voltage frequency converter is set to 50 Hertz, namely actual list data of steam supply quantity corresponding to each Hertz under the working frequency of 50 Hertz of the high-voltage frequency converter is obtained, after a maximum total steam quantity use value of a large steam turbine under maximum work is obtained, a deceleration instruction or an acceleration instruction is generated according to the actual list data, the maximum total steam quantity use value and a target steam total quantity actual value, wherein the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage frequency converter, and the target working frequency value is a formula frequency value
And (4) determining.
According to a fourth aspect of the present invention, there is provided a logic control system of a full-frequency conversion electric feedwater pump system, which retains parameters and signals for receiving parameters and signals including a power grid AGC automatic generation control system, a boiler control system and a DCS distributed control system, and further includes a part of hardware devices of the full-frequency conversion electric feedwater pump system modified by the above-mentioned steam-operated feedwater pump system, the logic control system of the full-frequency conversion electric feedwater pump system comprising: the signal acquisition device is used for acquiring real-time pressure values monitored by each group of pressure sensors, real-time flow values monitored by the flow sensors and real-time temperature values monitored by the temperature sensors and generating three groups of real-time operation values; the system comprises a first signal acquisition device, a second signal acquisition device and a control device, wherein the first signal acquisition device is used for acquiring boiler real-time operation parameters sent by a boiler control system and AGC real-time instruction values sent by a power grid AGC automatic generation control system, the AGC real-time instruction values comprise a large turbine rotating speed instruction value and a large turbine load instruction value, and the boiler real-time operation parameters are correspondingly provided with a steam total set value; the signal analysis device is used for confirming a group of comparison operation values according to the three groups of real-time operation values, sequentially comparing the comparison operation values with a plurality of operation values on a preset operation value list, and confirming that the operation value with the minimum or equivalent difference value with the comparison operation values is the actual operation value of the boiler, wherein the operation value is a fixed factory-leaving set value generated by each device according to the use characteristics and specific use parameter values of the device during production and processing; the first signal calculation device is used for acquiring a target total steam set value according to the actual operation value of the boiler, the rotating speed instruction value of the large steam turbine, the load instruction value of the large steam turbine and the current steam quantity value in the main steam supply pipeline of the large steam turbine; the second signal calculation device is used for acquiring a steam total amount difference according to the target steam total amount set value and the steam total amount actual value; the third signal calculation device is used for acquiring a target total steam amount actual value according to the boiler real-time operation parameter, the large steam turbine load instruction value, the total steam amount difference and the target total steam amount set value; and the signal and power output device is used for generating and converting the actual value of the target total amount into a deceleration instruction or an acceleration instruction for regulating the high-voltage frequency converter and finally controlling the operation of the water feeding pump.
In the technical scheme, three groups of independent data, namely three groups of real-time pressure values, real-time flow values and real-time temperature values, are obtained through three groups of pressure sensors, flow sensors and temperature sensors which are independently arranged on a main steam supply pipeline of a large steam turbine, one group of data which is respectively closest to an average value in the three groups of data is selected as a comparison operation value, the comparison operation value is sequentially compared with a plurality of operation values on a preset operation value list, an actual steam quantity value in a main pipeline of the large steam turbine, a rotating speed instruction value of the large steam turbine under AGC and a load instruction value of the large steam turbine under AGC are confirmed to obtain a next target total steam quantity set value of AGC, a total steam quantity difference is obtained according to the target total steam quantity set value and the actual steam quantity value, and a target total steam quantity actual value is obtained according to the actual steam quantity value, the load instruction value of the large steam turbine, the total steam, the method generates and converts a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter according to the actual value of the target total amount, finally controls the operation of the water feeding pump, rapidly and accurately controls the variable-frequency operation of the water feeding pump, enhances the real-time accuracy of a water feeding system of a unit under various loads, particularly in a low-load operation interval, improves the operation efficiency of a water feeding pump set, avoids the working deviation of the water feeding system, also greatly improves the response speed of a large turbine responding to an AGC (automatic gain control) instruction, and effectively avoids the water feeding deviation and low responsiveness caused by a plurality of factors such as false water level and load disturbance which can not be avoided originally and can only be adjusted according to a calculation method of boiler drum water level.
In any one of the above technical solutions, preferably, the first signal calculation means includes: the second signal acquisition module is used for acquiring the actual rotating speed value of the large steam turbine according to the current steam quantity value in the main steam supply pipeline of the large steam turbine; a third signal acquisition module for controlling the large steam turbine according to the AGC real-time instructionAcquiring a regulating stage pressure set value of a main steam supply pipeline of the large steam turbine and a reheater outlet pressure set value according to the rotating speed instruction value and the actual rotating speed value of the large steam turbine under the AGC real-time instruction; the fourth signal acquisition module is used for acquiring a total steam set value in a main steam supply pipeline of the large turbine under the AGC real-time instruction according to the large turbine load instruction value; the fifth signal acquisition module is used for acquiring a deviation value between the total steam quantity set value and the current steam quantity value in the main steam supply pipeline; a fourth signal calculation module, configured to obtain a target total steam amount set value according to the regulation-stage pressure set value, the reheater outlet pressure set value, and the deviation value, where the target total steam amount set value is represented by a formula PS ═ KRP1Determining a + Δ P, where PS is the target steam total setting, KRSet point of reheater outlet pressure at hundred percent load, P1The pressure of the regulating stage of the large steam turbine is set, and the delta P is the deviation value.
In the technical scheme, the actual steam quantity value in the main pipeline of the large steam turbine comprises the actual rotating speed of the large steam turbine in a set rule, namely the actual rotating speed value of the large steam turbine is obtained according to the current steam quantity value in the main pipeline of the large steam turbine, and the actual rotating speed value needs to be close to the rotating speed required by a power grid AGC automatic generation control system under a real-time instruction; then, acquiring a regulating stage pressure set value of the large steam turbine and a reheater outlet pressure set value according to the next rotating speed instruction value and the actual rotating speed value of the AGC real-time instruction, wherein the reheater outlet pressure set value is a pressure set value when the reheater outlet is subjected to hundred percent load, acquiring a steam total amount set value in a main steam supply pipeline of the large steam turbine according to the large steam turbine load instruction value, and the steam total amount set value is a steam total amount value of an actual working target of an electric water supply pump system in the production field under the load instruction of a power grid AGC automatic generation control system; then obtaining a deviation value between a total steam set value and a current steam quantity value in a main steam supply pipeline, wherein the deviation value is a difference between the total steam set value and a steam quantity set under a real-time instruction of a power grid AGC automatic generation control system; then according to the pressure set value of the regulating stageObtaining a target steam total amount set value by the set value and the deviation value of the outlet pressure of the heat device, wherein the target steam total amount set value is represented by a formula PS (K)RP1And determining the +/-delta P.
In any one of the above technical solutions, preferably, the second signal calculation means includes: a fifth signal calculation module for obtaining the actual value of the total steam amount in the main steam pipeline according to the set value of the regulation stage pressure and the value of the first stage extraction steam pressure, wherein the actual value of the total steam amount is represented by a formula
Determining, wherein D is the actual value of the total amount of steam in the main steam pipeline, P1Is the set value of the pressure of the regulating stage, P, of the large steam turbine2The first-stage extraction pressure value is set, and a and b are set values; a sixth signal calculating module for obtaining a steam total amount difference according to the target steam total amount set value and the steam total amount actual value, wherein the steam total amount difference is calculated by a formula
And determining, wherein Y is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value, PS is the target total steam quantity set value, and D is the actual total steam quantity value in the main steam pipeline.
In the technical scheme, the actual value of the total steam quantity in the main steam pipeline is obtained by adjusting the set value of the stage pressure and the pressure value of the stage extraction steam, and the actual value of the total steam quantity is calculated by a formula
Determining that the actual value of the total steam quantity is the current value of the main steam flow in the main steam supply pipeline of the large steam turbine on the production site; then, the steam total amount difference is obtained through the target steam total amount set value and the steam total amount actual value, and the steam total amount difference is calculated through a formula
And determining that the total steam quantity difference is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to a real-time instruction of a power grid AGC automatic generation control system.
In any one of the above technical solutions, preferably, the third signal calculation means includes: the sixth signal acquisition module is used for acquiring a comprehensive load instruction value of the boiler according to the real-time operating parameters of the boiler and the load instruction value of the large steam turbine; a seventh signal calculation module, configured to perform nonlinear processing on the boiler comprehensive load instruction value, add the processed boiler comprehensive load instruction value as a total steam quantity numerical value and the steam quantity difference to obtain a sum of the total steam quantity numerical value and the steam quantity difference, where the total steam quantity actual value is a target total steam quantity actual value obtained by a formula
Determining, wherein W is the actual value of the target total steam quantity, and H is the value of the total steam quantity generated by the boiler in real time, namely, the comprehensive load instruction value of the boiler is subjected to a nonlinear function f1(x) And converting, wherein Y is the total steam quantity difference which must be met in the main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value.
In the technical scheme, a boiler comprehensive load instruction value is obtained through boiler real-time operation parameters and a large steam turbine load instruction value, namely the boiler load instruction value output by a boiler control system is superposed with the large steam turbine load instruction value sent by a power grid AGC automatic power generation control system to serve as the boiler comprehensive load instruction value, and the boiler comprehensive load instruction value is processed by a nonlinear function f1(x) Converting into instantaneous boiler evaporation load value, i.e. the steam total value H generated by the boiler in real time, and then superposing the steam total value H and the steam total difference, i.e. by formula
And determining and acquiring a target total steam quantity actual value, namely the total steam quantity value required by the large steam turbine under the next command of the AGC real-time command.
In any one of the above technical solutions, preferably, the signal and power output device includes: the seventh signal acquisition module is used for acquiring a list corresponding to the maximum steam supply quantity of each Hertz working frequency preset by the high-voltage frequency converter; the eighth signal acquisition module is used for acquiring list data corresponding to each hertz under the corresponding working frequency in the list according to the model and the frequency requirement of the high-voltage frequency converter, wherein the working frequency of the high-voltage frequency converter is set to be 50 hertz, and acquiring actual list data of steam supply amount corresponding to each hertz under the working frequency of 50 hertz of the high-voltage frequency converter; the ninth signal acquisition module is used for acquiring the maximum use value of the total steam volume of the large steam turbine under the maximum work; an eighth signal calculation module, configured to generate and convert a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage inverter according to the actual list data, the maximum total steam usage value, and the actual target total steam amount value, where the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage inverter, and the target working frequency value is represented by a formula
Wherein G is the target working frequency value, W is the target steam total actual value, E is the maximum use value of the total steam amount, and S is the actual list data; and the output module is used for controlling the feed pump to operate according to the received target working frequency.
In the technical scheme, a list corresponding to each Hertz working frequency preset by a high-voltage frequency converter and steam supply quantity is obtained, and then list data corresponding to each Hertz working frequency in the list is obtained according to the type and frequency requirements of the high-voltage frequency converter, wherein the list data correspond to each Hertz working frequency in the high-voltage frequency converterThe working frequency is set to be 50Hz, namely the actual list data of the steam consumption corresponding to each Hz of the high-voltage frequency converter under the working frequency of 50Hz is obtained, after the maximum using value of the total steam quantity of the large steam turbine under the maximum working is obtained, the actual list data, the maximum using value of the total steam quantity and the actual value of the total target steam quantity are generated and converted into a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter, wherein the deceleration instruction or the acceleration instruction is the target working frequency value sent to the high-voltage frequency converter, and the target working frequency value is the target working frequency value sent to the high-voltage frequency
And (4) determining. The signal and the output module in the power output device are provided with a power supply and an operation instruction required by a preposed pump motor at the same time.
In the technical scheme, the system also comprises a supervision and protection system, wherein the supervision and protection system is internally provided with all factory set values and protection value parameters related to equipment and a verified protection program of each equipment fault and is used for performing protection action when the fault occurs, and the supervision and protection system and the DCS distributed control system are in bidirectional communication setting and are used for feeding back the real-time state of the full-frequency-conversion electric water supply pump system and the real-time states of other related systems of the generator set in time, effectively coordinating all related operation data and programs to be used for protection and fault processing implementation, and ensuring the safe operation of the whole generator set.
Compared with the prior art, the invention has the advantages that: the steam feed pump system is changed into a full frequency conversion electric feed pump system and a brand new logic control method thereof, the control system DEH of a small steam turbine and the small steam turbine in the steam feed pump system is removed, the driving motor and the speed-up gear box which are connected with each other are arranged at the position of the original small steam turbine, and the high-voltage frequency converter is used for controlling the operation of the driving motor of the feed pump, so that the operation efficiency of a feed pump set is improved, the working deviation of the feed system is avoided, the reaction speed of the large steam turbine responding to an AGC instruction is also greatly improved, and the water supply deviation and the low responsiveness caused by a plurality of factors such as false water level, load disturbance and the like which cannot be avoided by adjusting the operation speed of the small steam turbine according to a calculation method of the water level of a boiler drum in the prior art are effectively avoided. The response level and accuracy of the generator set in response to frequent load adjustment operation of the automatic power generation control system of the power grid AGC can be effectively improved, the real-time accuracy of the water feeding pump system of the generator set in various load intervals, particularly in a low-load operation interval, is enhanced, the efficiency of the water feeding pump system is improved, and the possibility of safety failure of the water feeding pump system is avoided.
Drawings
FIG. 1 shows a flow diagram of a method of a steam feed water pump system to a full variable frequency electric feed water pump system according to an embodiment of the invention;
FIG. 2 illustrates a flow diagram of a novel logic control method for a full variable frequency electric feedwater pump system, according to an embodiment of the present invention;
FIG. 3 shows a block schematic diagram of the structure of the logic control system of a full variable frequency electric feedwater pump system, according to an embodiment of the present invention;
FIG. 4 illustrates a master control loop diagram of a full variable frequency electric feedwater pump system in accordance with an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a type A configuration consisting of two 50% capacity feed water pumps under the logical control system of a full variable frequency electric feed water pump system according to an embodiment of the present invention;
FIG. 6 shows a schematic diagram of type B consisting of two 50% capacity feed water pumps under the logic control system of a full variable frequency electric feed water pump system according to an embodiment of the present invention;
FIG. 7 shows a schematic diagram of type A consisting of a 100% capacity feed pump under the logic control system of a full variable frequency electric feed pump system in accordance with an embodiment of the present invention;
FIG. 8 shows a schematic diagram of type B consisting of a 100% capacity feed pump under the logic control system of a full variable frequency electric feed pump system according to an embodiment of the present invention.
Shown in the figure: the system comprises a signal acquisition device 301, a first signal acquisition device 302, a signal analysis device 303, a first signal calculation device 304, a second signal calculation device 305, a third signal calculation device 306, a signal and power output device 307, a second signal acquisition module 3041, a third signal acquisition module 3042, a fourth signal acquisition module 3043, a fifth signal acquisition module 3044, a fourth signal calculation module 3045, a fifth signal calculation module 3051, a sixth signal calculation module 3052, a sixth signal acquisition module 3061, a seventh signal calculation module 3062, a seventh signal acquisition module 3071, an eighth signal acquisition module 3072, a ninth signal acquisition module 3073, an eighth signal calculation module 3074, an output module 3075, a supervision and protection system 308, a high voltage 312, a driving motor 313, a gear box frequency converter 314, a feed pump 315, a pre-pump 316 and a pre-pump motor 317.
Detailed Description
In order to achieve the purpose, new logic control scheme and technical structure scheme, and advantages of the embodiments of the present invention more clearly, the logic control scheme and technical structure scheme in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is conventionally understood by those skilled in the art, is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or the element which is indicated must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. For those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described by understanding the specific meanings of the above terms in the present invention and the drawings in the embodiments, and it is obvious that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, a method for modifying a full-frequency-conversion electric feed water pump system by a steam feed water pump system, the steam feed water pump system comprising a small steam turbine, a steam feed water pump control system DEH, a feed water pump 315, a pre-pump motor 317 and a pre-pump 316, the feed water pump 315, the pre-pump motor 317 and the pre-pump 316 together being a hardware structure of a rotating part of the modified full-frequency-conversion electric feed water pump system, the method comprises the following steps:
101, dismantling a small steam turbine and a steam feed pump control system DEH in the steam feed pump system;
102, installing a driving motor 313 and a speed-up gearbox 314 which are connected with each other at the position of the original small turbine, wherein the speed-up gearbox 314 is in mechanical transmission connection with the feed water pump 315, and the driving motor 313 is connected with a signal and power output device 307 in a modified brand new control system through a high-voltage frequency converter 312.
When a small steam turbine in the steam-driven feed water pump system is removed, a steam-driven feed water pump control system DEH (digital electro-hydraulic control system of the steam turbine) and a traditional logic calculation control mode and method for controlling the operation of the feed water pump system by keeping the water level of a boiler drum in the original DCS distributed control system are also removed.
A full frequency conversion motor-driven feed water pump system that steam-operated feed water pump system was modified into, includes brand-new logic control system 300 after the repacking, and this wherein has remain and has received the parameter and the signal of electric wire netting AGC automatic generation control system, DCS distributed control system and boiler control system, still includes: the method for changing the steam-driven water feed pump system into the full-frequency-conversion electric water feed pump system comprises the steps that three groups of independent pressure sensors, flow sensors and temperature sensors are respectively and newly arranged on a main steam supply pipeline of a large steam turbine, a signal and electric power output device 307 in a brand-new logic control system 300 is connected with the high-voltage frequency converter 312, the high-voltage frequency converter 312 is connected with the water feed pump 315 sequentially through the driving motor 313 and the speed-increasing gearbox 314, the water feed pump 315 is connected with the front pump 316 and the front pump motor 317 sequentially through pipelines, the front pump motor 317 and the front pump 316 are connected in an original mechanical transmission mode, and the front pump motor is connected with the signal and electric power output device 307 in the brand-new logic control system 300.
As shown in fig. 2, a logic control method for a new design of a full-frequency conversion electric feed water pump system, which retains the hardware for receiving parameters and signals including a power grid AGC automatic generation control system, a boiler control system and a DCS distributed control system, and also includes a rotating part of the full-frequency conversion electric feed water pump system modified from the steam feed water pump system as described above, the method includes:
202, acquiring boiler real-time operation parameters sent by a boiler control system and AGC real-time instruction values sent by a power grid AGC automatic generation control system, wherein the AGC real-time instruction values comprise a large turbine rotating speed instruction value and a large turbine load instruction value, and a total steam quantity set value is arranged in a main steam supply pipeline of a large turbine corresponding to the boiler real-time operation parameters;
204, acquiring a target total steam set value under an AGC real-time instruction according to the actual operation value of the boiler, the rotating speed instruction value of the large steam turbine, the load instruction value of the large steam turbine and the current steam quantity value in the main steam supply pipeline;
and step 207, generating and converting the target total amount actual value into a deceleration instruction or an acceleration instruction of the high-voltage frequency converter 312, and finally controlling the operation of the water feeding pump 315.
Wherein, three groups of independent data, namely three groups of real-time pressure values, real-time flow values and real-time temperature values, are obtained through three groups of pressure sensors, flow sensors and temperature sensors which are independently arranged on a main steam supply pipeline of the large steam turbine, one group of data which are respectively the closest values in the three groups of data is selected as a comparison operation value, the comparison operation value is sequentially compared with a plurality of operation values on a preset operation value list, the actual total steam quantity value in the main pipeline of the large steam turbine is confirmed correspondingly, then a target total steam quantity set value required by the next step under an AGC real-time instruction is obtained according to the actual total steam quantity value, a rotating speed instruction value of the large steam turbine under an AGC real-time instruction and a load instruction value of the large steam turbine under an AGC real-time instruction, and a total steam quantity difference under the AGC real-time instruction is obtained according, acquiring a target total steam actual value according to the boiler real-time operation parameters, the large steam turbine load instruction value, the steam total difference and the target total steam set value, generates and converts the target total amount actual value into a deceleration command or an acceleration command for regulating the high-voltage inverter 312, and finally, the operation of the feed pump 315 is controlled, the variable-frequency operation of the feed pump 315 is rapidly and accurately controlled, the operation efficiency and the real-time accuracy of the feed system of the unit in various load operation intervals, particularly low-load operation intervals are improved and enhanced, the working deviation of the feed system is avoided, the reaction speed of the large turbine responding to an AGC instruction is greatly improved, and the deviation and the low responsiveness of the feed system caused by the fact that the rotation speed (feed flow) of the feed pump 315 can be adjusted only according to a method for calculating the water level of a boiler drum and various factors such as false water level and load disturbance which cannot be avoided in the prior art are effectively avoided.
Further, the specific steps of obtaining a target total steam quantity set value according to the actual operation value of the boiler, the rotating speed instruction value of the large steam turbine, the load instruction value of the large steam turbine and the current steam quantity value in the main steam supply pipeline include: acquiring an actual rotating speed value of the large steam turbine according to a current steam quantity value in a main steam supply pipeline of the large steam turbine; acquiring a regulating stage pressure set value of a main steam supply pipeline of the large steam turbine and a reheater outlet pressure set value according to the actual rotating speed value of the large steam turbine and the rotating speed instruction value of the large steam turbine under the AGC real-time instruction; acquiring a total steam quantity set value in a main steam supply pipeline of the large steam turbine according to the load instruction value of the large steam turbine; acquiring a deviation value between the total steam quantity set value and the current steam quantity value in the main steam supply pipeline; acquiring a target steam total amount set value according to the regulating stage pressure set value, the reheater outlet pressure set value and the deviation value, wherein the target steam total amount set value is represented by a formula PS (K)RP1Determining a + Δ P, where PS is the target steam total setting, KRSet point of reheater outlet pressure at hundred percent load, P1The pressure of the regulating stage of the large steam turbine is set, and the delta P is the deviation value.
The method comprises the steps that the current steam value in a main steam pipeline of the large steam turbine comprises the actual rotating speed of the large steam turbine in a set rule, namely the actual rotating speed value of the large steam turbine is obtained according to the current steam value in a main pipeline of the large steam turbine, the actual rotating speed value meets the rotating speed required by a real-time instruction value on an automatic generation control system of the power grid AGC, and the rotating speed required by the automatic generation control system of the power grid AGC is achieved by pushing the large steam turbine to rotate by using high-temperature and high-pressure steam to drive a generator to rotate so as to complete power; then, acquiring a regulating stage pressure set value and a reheater outlet pressure set value of the large steam turbine according to the next step load and new rotating speed instruction value of AGC and the current actual rotating speed value, wherein the reheater outlet pressure set value is the pressure set value when the reheater outlet is subjected to hundred percent load, and acquiring a total steam set value in a main steam supply pipeline of the large steam turbine according to the large steam turbine load instruction value, wherein the total steam set value is the steam set value in the main steam supply pipeline of the large steam turbineThe steam total setting value is a steam total value actually required by the electric water supply pump system on the production site under the load instruction of the power grid AGC automatic generation control system; then obtaining a deviation value between a total steam set value and a current steam quantity value in a main steam supply pipeline, wherein the deviation value is a difference between the total steam set value and a steam quantity set under a real-time instruction of a power grid AGC automatic generation control system; and then acquiring a target steam total amount set value according to the regulating stage pressure set value, the reheater outlet pressure set value and the deviation value, wherein the target steam total amount set value is represented by a formula PS (K)RP1And determining the +/-delta P.
Further, the specific step of obtaining the steam total amount difference according to the target steam total amount set value and the actual steam total amount value in the main steam supply pipeline of the large steam turbine comprises the following steps: acquiring an actual value of the total steam quantity in the main steam pipeline according to the set value of the regulation stage pressure and the value of the primary steam extraction pressure, wherein the actual value of the total steam quantity is obtained by a formula
Determining, wherein D is the actual value of the total amount of steam in the main steam pipeline, P1Is the set value of the pressure of the regulating stage, P, of the large steam turbine2The first-stage extraction pressure value is set, and a and b are set values; obtaining the steam total amount difference according to the target steam total amount set value and the steam total amount actual value, wherein the steam total amount difference is obtained by a formula
And determining, wherein Y is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value, PS is the target total steam quantity set value, and D is the actual total steam quantity value in the main steam pipeline.
Wherein, the actual value of the total steam amount in the main steam pipeline is obtained by adjusting the set value of the stage pressure and the pressure value of the stage extraction steam, and the steam is evaporatedThe actual value of the total amount of steam is represented by the formula
Determining that the actual value of the total steam quantity is the current value of the main steam flow in the main steam supply pipeline of the large steam turbine on the production site; then, the steam total amount difference is obtained through the target steam total amount set value and the steam total amount actual value, and the steam total amount difference is calculated through a formula
And determining that the total steam quantity difference is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to a real-time instruction of a power grid AGC automatic generation control system.
Further, the specific steps of obtaining the actual value of the total amount of the target steam according to the real-time operation parameters of the boiler, the load instruction value of the large steam turbine, the difference of the total amount of the steam and the set value of the total amount of the target steam comprise: acquiring a comprehensive load instruction value of the boiler according to the real-time operating parameters of the boiler and the load instruction value of the large steam turbine; carrying out nonlinear processing on the boiler comprehensive load instruction value, adding the processed value, namely the steam total amount value generated by the boiler in real time, and the steam total amount difference to obtain the sum of the two, wherein the sum is used as a target steam total amount actual value under an AGC new instruction, and the target steam total amount actual value is expressed by a formula
Determining, wherein W is the actual value of the target total steam quantity, and H is the value of the total steam quantity generated by the boiler in real time, namely, the comprehensive load instruction value of the boiler is subjected to a nonlinear function f1(x) And converting, wherein Y is the total steam quantity difference which must be met in the main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value.
Wherein, a boiler comprehensive load instruction value is obtained through the real-time operation parameters of the boiler and the large steam turbine load instruction value, namely, the boiler load instruction value output by the boiler control system is superposed with the large steam turbine load instruction value sent by the power grid AGC automatic generation control system to be used as the boilerSynthesizing the load instruction values through a non-linear function f1(x) Converting into instantaneous boiler evaporation load value, i.e. the steam total value H generated by the boiler in real time, and then superposing the steam total value H and the steam total difference, i.e. by formula
And determining and acquiring a target total steam quantity actual value, namely the required total steam quantity of the next step of the large steam turbine.
Further, the specific steps of generating and converting the target total amount actual value into a deceleration instruction or an acceleration instruction of the high-voltage inverter 312, and finally controlling the operation of the feed water pump 315 include: acquiring a numerical value corresponding to each Hertz working frequency preset by the high-voltage frequency converter 312 and a steam maximum supply quantity list; acquiring list data corresponding to each hertz under the corresponding working frequency in the list according to the model and frequency requirements of the high-voltage frequency converter 312, wherein the working frequency of the high-voltage frequency converter 312 is set to be 50 hertz, and acquiring actual list data of steam supply amount corresponding to each hertz under the working frequency of 50 hertz of the high-voltage frequency converter 312; acquiring a maximum use value of the total steam volume of the large steam turbine under the maximum work; generating and converting the actual list data, the maximum total steam amount utilization value and the actual target steam amount value into a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter 312, wherein the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage frequency converter 312, and the target working frequency value is represented by a formula
Wherein G is the target working frequency value, W is the target steam total actual value, E is the maximum use value of the total steam amount, and S is the actual list data; a driving motor 313 for controlling the feed water pump 315 drives the feed water pump 315 through a speed-increasing gear box 314 according to the target working frequency received by the high-voltage frequency converter 312The rotating speed is rotated and operated.
The method comprises the steps of obtaining a list corresponding to each hertz working frequency preset by the high-voltage frequency converter 312 and steam supply amount, and then obtaining list data corresponding to each hertz under the corresponding working frequency in the list according to the type and frequency requirements of the high-voltage frequency converter 312, wherein the working frequency of the high-voltage frequency converter 312 is set to be 50 hertz, namely obtaining actual list data of steam consumption amount corresponding to each hertz under the working frequency of 50 hertz of the high-voltage frequency converter 312.
For example,
g1200 t/h/(2000t/h/50hz) (2000t/h is the maximum use value of the total steam quantity for example)
G＝1200t/h/40t/h
G is 30hz (the working frequency output to the high-voltage frequency converter 312 is 30hz at this moment until the automatic power generation control system of the power grid AGC changes again)
The high voltage inverter 312 of the present invention is set to an operating frequency of 50 hz.
After the maximum use value of the total steam amount of the large steam turbine under the maximum work is obtained, the maximum use value of the total steam amount and the actual value of the target total steam amount are generated according to the actual list data, the maximum use value of the total steam amount and the actual value of the target total steam amount and converted into a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter 312, wherein the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage frequency converter 312, and the target working frequency value is a target working
And (4) determining.
A logic control system 300 of a full-frequency conversion electric water feeding pump system, which reserves parameters and signals for receiving a power grid AGC automatic generation control system, a boiler control system and a DCS distributed control system, and also comprises part of hardware equipment of the full-frequency conversion electric water feeding pump system modified by the steam-driven water feeding pump system, wherein the logic control system 300 of the full-frequency conversion electric water feeding pump system comprises: the signal acquisition device 301 is configured to acquire a real-time pressure value monitored by each group of pressure sensors, a real-time flow value monitored by the flow sensor, and a real-time temperature value monitored by the temperature sensor, and generate three groups of real-time operation values; the first signal acquisition device 302 is used for acquiring boiler real-time operation parameters sent by a boiler control system and AGC real-time instruction values sent by a power grid AGC automatic power generation control system, wherein the AGC real-time instruction values comprise a large turbine rotating speed instruction value and a large turbine load instruction value, and the boiler real-time operation parameters are correspondingly provided with a steam total amount set value; a signal analyzing device 303, configured to determine a set of comparison operation values according to the three sets of real-time operation values, sequentially compare the comparison operation values with a plurality of operation values on a preset operation value list, and determine that an operation value with a minimum or equal difference to the comparison operation value is an actual operation value of the boiler, where the operation value is a fixed factory-setting value generated by each device during production and processing according to a usage characteristic and a specific usage parameter value of the device; a first signal calculating device 304, configured to obtain a target total steam set value according to the actual operation value of the boiler, the rotational speed instruction value of the large steam turbine, the load instruction value of the large steam turbine, and the current steam quantity value in the main steam supply pipeline of the large steam turbine; a second signal calculating means 305 for obtaining a steam total amount difference according to the target steam total amount set value and the steam total amount actual value; a third signal calculating device 306, configured to obtain an actual value of the total amount of target steam according to the real-time operating parameter of the boiler, the load instruction value of the large steam turbine, the difference of the total amount of steam, and the set value of the total amount of target steam; and the signal and power output device 307 is used for generating and converting a deceleration instruction or an acceleration instruction of the high-voltage frequency converter 312 according to the target total amount actual value, and finally controlling the operation of the water feed pump 315.
The method comprises the steps that three groups of independent data, namely three groups of real-time pressure values, three groups of real-time flow values and three groups of real-time temperature values, are acquired through three groups of pressure sensors, flow sensors and temperature sensors which are independently arranged on a main steam supply pipeline of the large steam turbine, one group of data which are respectively closest to the three groups of data are selected as comparison operation values, the comparison operation values are sequentially compared with a plurality of operation values on a preset operation value list, and the actual steam quantity value in the corresponding main steam turbine pipeline is confirmed.
The operation values are factory set values, each device is specially processed and produced according to the use characteristics of the device and specific use parameter values of each given device during production and processing and then is provided for a final user for use, the devices are adjusted and corrected again after being assembled into operation within the first 168 hours after installation to become regular parameter set values fixed by the devices, in addition, the calculation logics of the working relationship among different devices given in different matched production flows in a fixed regulation of thermal power design and the calculation fixed values matched with the calculation logics are adopted, and data such as various calculated quantities and comparison quantities generated by the calculation logics and protection data and protection programs of the devices are all correspondingly input into different control unit modules or configurations in a field DCS distributed control system so as to be used in daily production, these data and protection routines are also input and stored in the new logic control system 300 of the full variable frequency electric feedwater pump 315: including but not limited to: signal analysis means 303, first signal calculation means 304, second signal calculation means 305 and third signal calculation means 306, supervision and protection system 308 for analysis, calculation, comparison, supervision and protection.
Then obtaining a target total steam amount set value of a next instruction under AGC according to an actual steam amount value in the main pipeline of the large steam turbine, a rotating speed instruction value of the large steam turbine under AGC and a load instruction value of the large steam turbine under AGC, obtaining a total steam amount difference according to the target total steam amount value and an actual real-time steam amount value, obtaining a target total steam amount actual value according to the actual steam amount value in the main pipeline of the large steam turbine, the load instruction value of the large steam turbine, the total steam amount difference and the target total steam amount set value, generating and converting the target total amount actual value into a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter 312, finally controlling the operation of the water feeding pump 315, rapidly and accurately controlling the variable-frequency operation of the water feeding pump 315, strengthening the real-time accuracy of the water feeding system of the unit under various loads, particularly in, the working deviation of a water supply system is avoided, the reaction speed of the large turbine responding to the AGC instruction is greatly improved, and the water supply deviation and low responsiveness caused by the factors of false water level, load disturbance and the like which cannot be avoided in the prior art that the operation speed of the small turbine can only be adjusted according to a calculation method of the water level of a boiler drum are effectively avoided.
Further, the first signal calculating means 304 comprises: the second signal obtaining module 3041 is configured to obtain an actual rotating speed value of the large steam turbine according to an actual steam quantity value in a main steam supply pipeline of the large steam turbine; a third signal obtaining module 3042, configured to obtain a regulation stage pressure set value of the large steam turbine and a reheater outlet pressure set value according to the large steam turbine rotation speed instruction value under the AGC real-time instruction and the actual rotation speed value of the large steam turbine under the AGC real-time instruction; a fourth signal obtaining module 3043, configured to obtain a total steam amount setting value in a main steam supply pipeline of the large steam turbine according to the large steam turbine load instruction value; a fifth signal obtaining module 3044, configured to obtain a deviation value between a lower total steam amount set value under the AGC real-time instruction and a current steam amount value in the main steam supply pipeline; a fourth signal calculating module 3045, configured to obtain a target total steam amount setting value according to the regulation stage pressure setting value, the reheater outlet pressure setting value, and the deviation value, where the target total steam amount setting value is represented by a formula PS ═ KRP1Determining a + Δ P, where PS is the target steam total setting, KRSet point of reheater outlet pressure at hundred percent load, P1The pressure of the regulating stage of the large steam turbine is set, and the delta P is the deviation value.
The actual steam quantity value in the main pipeline of the large steam turbine comprises the actual rotating speed of the large steam turbine in a set rule, namely the actual rotating speed value of the large steam turbine is obtained according to the current steam quantity value in the main pipeline of the large steam turbine, and the actual rotating speed value needs to be close to the rotating speed required by a real-time instruction of an automatic generation control system (AGC) of a power grid; then according to the next rotating speed instruction value of AGC real-time instructionAcquiring a regulating stage pressure set value of the large steam turbine and a reheater outlet pressure set value together with an actual rotating speed value, wherein the reheater outlet pressure set value is a pressure set value when a reheater outlet is subjected to hundred percent load, acquiring a steam total set value in a main steam supply pipeline of the large steam turbine according to a large steam turbine load instruction value, and the steam total set value is a steam total value actually required by an electric water supply pump system to produce a site under a load instruction of a power grid AGC automatic power generation control system; then obtaining a deviation value between a total steam set value and a current steam quantity value in a main steam supply pipeline, wherein the deviation value is a difference between the total steam set value and a steam quantity set under a real-time instruction of a power grid AGC automatic generation control system; and then acquiring a target steam total amount set value according to the regulating stage pressure set value, the reheater outlet pressure set value and the deviation value, wherein the target steam total amount set value is represented by a formula PS (K)RP1And determining the +/-delta P.
Further, the second signal calculation device 305 includes: a fifth signal calculation module 3051, configured to obtain an actual value of the total steam amount in the main steam pipe according to the set value of the regulation stage pressure and the first-stage extraction pressure value, where the actual value of the total steam amount is calculated according to a formula
Determining, wherein D is the actual value of the total amount of steam in the main steam pipeline, P1Is the set value of the pressure of the regulating stage, P, of the large steam turbine2The first-stage extraction pressure value is set, and a and b are set values; a sixth signal calculation module 3052, configured to obtain a steam total difference according to the target steam total set value and the actual steam total value, where the steam total difference is calculated according to a formula
Determining that Y is the total steam quantity which must be met in the main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction valueAnd the quantity difference, PS is the set value of the target total steam quantity, and D is the actual value of the total steam quantity in the main steam pipeline.
Wherein, the actual value of the total steam quantity in the main steam pipeline is obtained by adjusting the set value of the stage pressure and the pressure value of the stage extraction steam, and the actual value of the total steam quantity is calculated by a formula
Determining that the actual value of the total steam quantity is the current value of the main steam flow in the main steam supply pipeline of the large steam turbine on the production site; then, the steam total amount difference is obtained through the target steam total amount set value and the steam total amount actual value, and the steam total amount difference is calculated through a formula
And determining that the total steam quantity difference is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to a real-time instruction of a power grid AGC automatic generation control system.
Further, the third signal calculating device 306 comprises: a sixth signal obtaining module 3061, configured to obtain a comprehensive load instruction value of the boiler according to the real-time operating parameter of the boiler and the load instruction value of the large steam turbine; a seventh signal calculation module 3062, configured to perform nonlinear processing on the boiler comprehensive load instruction value, add the processed boiler comprehensive load instruction value as a steam total value and the steam total difference to obtain a sum of the steam total value and the steam total value as a target steam total actual value, where the target steam total actual value is calculated by a formula
Determining, wherein W is the actual value of the target total steam quantity, and H is the value of the total steam quantity generated by the boiler in real time, namely, the comprehensive load instruction value of the boiler is subjected to a nonlinear function f1(x) And converting, wherein Y is the condition that the main steam supply pipeline of the large steam turbine is required to be full according to the AGC real-time instruction valueSufficient difference in total amount of steam.
Acquiring a boiler comprehensive load instruction value through a boiler real-time operation parameter and a large steam turbine load instruction value, namely superposing the boiler load instruction value output by a boiler control system on the large steam turbine load instruction value sent by a power grid AGC automatic power generation control system to serve as the boiler comprehensive load instruction value, and performing nonlinear function f1(x) Converting into instantaneous boiler evaporation load value, i.e. the steam total value H generated by the boiler in real time, and then superposing the steam total value H and the steam total difference, i.e. by formula
And determining and acquiring a target total steam quantity actual value, namely the total steam quantity value of the large steam turbine under the next instruction of the AGC real-time instruction.
Further, the signal and power output device 307 includes: a seventh signal obtaining module 3071, configured to obtain a list corresponding to the maximum steam supply amount for each hertz working frequency preset by the high-voltage frequency converter 312; an eighth signal obtaining module 3072, configured to obtain list data corresponding to each hertz at a corresponding working frequency in the list according to the model and frequency requirements of the high-voltage frequency converter 312, where the working frequency of the high-voltage frequency converter 312 is set to 50 hertz, and obtain actual list data of steam consumption corresponding to each hertz at the working frequency of 50 hertz of the high-voltage frequency converter 312; the ninth signal acquisition module 3073 is used for acquiring the maximum use value of the total steam volume of the large steam turbine under the maximum work; an eighth signal calculating module 3074, configured to generate and convert a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage inverter 312 according to the actual list data, the maximum total steam usage value, and the actual target total steam amount value, where the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage inverter 312, and the target working frequency value is represented by a formula
Wherein G is the target working frequency value, W is the target steam total actual value, E is the maximum use value of the total steam amount, and S is the actual list data; and the output module 3075 is used for controlling the feed water pump 315 to operate according to the received target working frequency.
Wherein, by obtaining the list corresponding to the steam supply amount for each hertz working frequency preset by the high-voltage frequency converter 312, and then, according to the model and frequency requirement of the high-voltage inverter 312, obtaining the corresponding list data per hz of the corresponding operating frequency in the list, wherein the operating frequency of the high-voltage inverter 312 of the present invention is set to 50hz, namely, the actual tabulated data of the amount of steam used per hertz corresponding to the high voltage inverter 312 at the 50 hertz operating frequency is obtained, after the maximum use value of the total steam amount of the large steam turbine under the maximum work is obtained, the maximum use value of the total steam amount and the actual value of the target total steam amount are generated and converted into a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter 312 according to the actual list data, wherein the deceleration command or the acceleration command is a target working frequency value sent to the high-voltage inverter 312, and the target working frequency value is represented by a formula.
After the target working frequency value output by the eighth signal calculation module 3074 is received, the target working frequency value is used as a working instruction and is combined with a power supply instruction of the water supply pump 315, the working instruction is transmitted to the connected high-voltage frequency converter 312 to realize the working of the water supply pump 315 under the variable-frequency operation, an independent driving motor 313 with a fixed rotating speed is additionally used for driving the operation of the front-mounted pump 316, and the output module 3075 in the logic control system 300 of the full variable-frequency electric water supply pump 315 is simultaneously provided with a power supply and a starting instruction required by the front-mounted pump motor 317.
Further, the newly designed logic control system 300 of the full-variable-frequency electric water-feeding pump system further includes a supervision and protection system 308, factory set values and protection value parameters of all devices and a verified protection program of a fault of each device are built in the supervision and protection system 308 for acting when the fault occurs, and the supervision and protection system 308 and the DCS distributed control system are in a bidirectional communication setting for feeding back a real-time state of the full-variable-frequency electric water-feeding pump system and real-time states of other related systems of the generator set in time, effectively coordinating all related operation data and programs as protection and implementing fault processing, and ensuring safe operation of the whole generator set.
In the actual using process, as shown in fig. 4, the new logic control system 300 of the full-frequency-conversion electric feedwater pump system directly replaces the control system DEH of the original steam feedwater pump system and all functions thereof, and the new logic control system 300 of the full-frequency-conversion electric feedwater pump system is further connected with auxiliary devices and related programs and parameters included in the DCS distributed control system in the prior art, including but not limited to: the flow/pressure/temperature in the main pipe of the water feeding pump 315, the actual rotating speed value of each water feeding pump 315, the pressure value of the water storage tank, the temperature value of the outlet of the separator, the actual temperature reduction water temperature and other equipment, parameters thereof, a calculation program and the like.
In the first embodiment, the main hardware structure of the steam feed pump 315 composed of two 50% capacity feed pumps 315 is as follows: two small turbines are used to drive a 50% capacity feed pump 315 for each turbine, and the configuration is further classified into type a and type B according to the different positions of the pre-pump 316 disposed in the system.
Type A:
the original configuration of a model a steam feed pump consisting of two 50% capacity feed pumps 315 is: two small turbines and two 50% capacity feed pumps 315 are arranged on the same floor with the large turbine (approximately 12-14 meters in the power plant room), but two sets of pre-pump motors 317 and pre-pumps 316 corresponding to the two sets of feed pumps 315 are arranged on the zero meter floor of the power plant floor, and the arrangement mode of the two sets of feed pumps 315 on the same floor is different, namely the arrangement mode of one small turbine and one feed pump 315 on the height of 12-14 meters in the room, and the arrangement mode of one pre-pump motor 317 and one pre-pump 316 on the zero meter floor of the room, are two sets in total.
As shown in fig. 5, the structure of two 50% capacity feed pumps 315 of the full variable frequency electric feed pump system of the present invention is: after the two small turbines are respectively removed on site, two new driving motors 313 of a water feeding pump 315 and two speed increasing gear boxes 314 with new customized rotation speed ratios are respectively installed on the basis of the original small turbines, and are respectively in mechanical transmission connection with the water feeding pump 315. The two high-voltage inverters 312 are arranged in a suitable space selected in the factory area, and are electrically connected with the driving motors 313 of the two feed pumps 315 respectively, and the two high-voltage inverters 312 are also electrically connected with the signal output device 307 respectively. The two sets of pre-pump motors 317 and the pre-pump 316 originally configured for the two feed pump systems are not modified, but remain in the original mechanical connection and original position (zero meters above ground). The hardware system structure of the two changed integral A-type frequency conversion electric water supply pump systems is that a high-voltage frequency converter 312 is electrically connected with a driving motor 313 of a water supply pump 315, the driving motor 313 of the water supply pump 315, a speed increasing gear box 314 with a new customized rotating speed ratio, the water supply pump 315, a pre-pump motor 317 and a pre-pump 316 are electrically connected with a signal and electric power output device 307, and the two sets of the pre-pump motors 317 are arranged in total.
Type B:
the original configuration of a type B steam feed pump consisting of two 50% capacity feed pumps 315 is: the two sets of "pre-pump 316, reduction gearbox, small turbine and feedwater pump 315" are all coaxially connected and arranged in the same floor (approximately 12-14 meters from the power plant room) with the large turbine. Namely "a pre-pump 316, a reduction gear box, a small turbine, a feed pump 315", there are two groups in total.
As shown in fig. 6, the structure of two 50% capacity feed pumps 315 of the full variable frequency electric feed pump system of the present invention is: after the two small turbines and the two reduction gear boxes connecting the two pre-pumps 316 are removed on site, the driving motors 313 of the two feed water pumps 315 and the two speed-increasing gear boxes 314 with the new customized rotation speed ratio are installed again according to a new sequence on the original basis of the original small turbines and reduction gear boxes, and the coaxial mechanical transmission connection arrangement is continuously maintained with the two pre-pumps 316 and the two feed water pumps 315 respectively. The two high-voltage inverters 312 are electrically connected to the drive motors 313 of the two feed pumps 315, respectively, and the two high-voltage inverters 312 are also electrically connected to the power output device 307, respectively, by signals. The hardware system structure of the two changed integral B-type frequency conversion electric water supply pump systems is that a high-voltage frequency converter 312 is electrically connected with a driving motor 313 of a water supply pump 315, a front-mounted pump 316, the driving motor 313, a speed increasing gear box 314 with a new customized rotating speed ratio and the water supply pump 315 are also reserved, and mechanical coaxial mechanical connection arrangement is reserved, so that two groups are provided.
The pre-pumps 316 of the water supply pump systems of the A-type structure and the B-type structure after being changed are kept in a water supply connection with the water supply pump 315 through pipelines, and the driving motors 313 of the pre-pumps 316 of the A-type structure are also electrically connected with the signal and power output device 307. The whole new system finishes water supply and work under the full-electric-drive operation mode of the high-voltage frequency converter 312 according to the frequency conversion instruction and the electric power output by the signal and electric power output device 307, abandons the operation control method and the hardware structure mode of a small steam turbine which can only be driven by steam under the traditional control logic of keeping the water level of a boiler drum of the original steam-driven water-feeding pump system, achieves accurate operation, particularly keeps higher operation efficiency when a unit is in a deep peak regulation interval of a low-load interval (20-40% of load), reduces coal consumption and improves the safety of a pump set.
In the second embodiment, a 100% capacity feed pump 315 is operated by a small turbine, and the structure is classified into a type and B type according to the different positions of the pre-pump 316 disposed in the system.
Type A:
the original configuration of a model a steam feed pump 315 consisting of a 100% capacity feed pump 315 is: the small turbine and feed pump 315 are located on the same floor with the large turbine (approximately 12-14 meters in the plant room), but the pre-pump motor 317 and pre-pump 316 are located on the zero meter floor of the plant floor, in a different manner than the feed pump 315, i.e. "one small turbine, one feed pump 315" at the height of 12-14 meters in the room, and "one pre-pump motor 317, one pre-pump 316" at zero meters in the room.
As shown in fig. 7, the full-variable-frequency electric feed water pump system of the present invention is composed of a feed water pump 315 with 100% capacity, and has a structure that: after the 'small turbine' is removed on site, a new driving motor 313 of a water feeding pump 315 and a speed increasing gear box 314 of a new customized rotation speed ratio are installed on the original basis of the original small turbine, and the mechanical transmission connection with the water feeding pump 315 is kept. The high voltage inverter 312 would be otherwise disposed in the appropriate space within the plant area and electrically connected to the drive motor 313 of the feedwater pump 315, the high voltage inverter 312 also being electrically connected to the signal and power output device 307. The pre-pump motor 317 and the pre-pump 316 which are originally configured in the water supply pump system are not changed after the original mechanical connection and original positions (the zero meter layer of the ground) are reserved. The hardware system structure of the changed integral A-type full-frequency-conversion electric water feeding pump is a structure of 'one frequency converter 312 electrically connected with a driving motor 313 of a water feeding pump 315, the driving motor 313 of the water feeding pump 315, a speed increasing gear box 314 with a new customized rotating speed ratio, the water feeding pump 315', a 'pre-pump motor 317 and a pre-pump 316', wherein the pre-pump motor 317 is electrically connected with a signal and power output device 307.
Type B:
the original configuration of a steam feed pump consisting of a 100% capacity feed pump 315 was: the pre-pump 316, the reduction gear box, the small turbine and the feed pump 315 are coaxially connected and arranged on the same layer with the large turbine (about 12-14 meters of the power plant room), namely, the structure of 'one pre-pump 316, one reduction gear box, one small turbine and one feed pump 315'.
As shown in fig. 8, the full-variable-frequency electric feed water pump system of the present invention is composed of a feed water pump 315 with 100% capacity, and has a structure of: after the small turbine and the speed reducing gear box connected with the front-mounted pump 316 are removed on site at the same time, the water feeding pump 315 driving motor 313 and the speed increasing gear box 314 with the new customized rotation speed ratio are installed again according to the new sequence on the original basis of the original small turbine and speed reducing gear box, and the coaxial mechanical transmission connection arrangement with the front-mounted pump 316 and the water feeding pump 315 is continuously maintained. The high voltage inverter 312 is disposed in an appropriate space selected additionally in the plant area and is electrically connected to the drive motor 313 of the feed pump 315, and the high voltage inverter 312 is also electrically connected to the signal output device 307. The hardware system structure of the changed integral B-type full-variable-frequency electric water feeding pump is that a frequency converter 312 is electrically connected with a driving motor 313 of a water feeding pump 315, a preposed pump 316, a driving motor 313, a speed increasing gear box 314 with a newly customized rotating speed ratio and a water feeding pump 315 are arranged, and the mechanical coaxial connection arrangement is also reserved.
The pre-pump 316 of the water supply pump system with the type A and the type B after being changed is kept in a water supply connection with the water supply pump 315 through a pipeline, and the pre-pump driving motor 313 of the type A is also kept in an electrical connection with the signal and power output device 307. The whole new system finishes water supply and work under the full-electric-drive operation mode of the high-voltage frequency converter 312 according to the frequency conversion instruction and the electric power output by the signal and electric power output device 307, abandons the operation control method and the hardware structure mode of the small steam turbine which can only be driven by steam under the traditional control logic of keeping the water level of a boiler drum of the original steam-driven water-feeding pump system, achieves accurate operation, particularly keeps higher operation efficiency when a unit is subjected to deep peak shaving in a low-load interval (20-40% of load), reduces coal consumption and improves the safety of the pump set.
The small steam turbine control system DEH is also called a steam turbine digital electro-hydraulic control system and is an important component of a steam turbine generator unit of a power plant, and the DCS distributed control system is also called a distributed control system, called DCS for short, and has been widely applied to various industries such as power, metallurgy, petrochemical industry and the like.
The technical scheme of the invention is explained in detail by combining the attached drawings, and the technical scheme of the invention provides a method for changing a steam-driven feed water pump system into a full-frequency-conversion electric feed water pump system, which greatly improves the response speed of the feed water pump system by removing a small steam turbine in the steam-driven feed water pump system and installing a driving motor and a speed-up gear box which are connected with each other at the position of the original small steam turbine, effectively avoids the problem that the operation of the steam-driven feed water pump can only be adjusted according to the calculated value of the water level of a boiler steam drum in the prior art and the water supply deviation and low responsiveness caused by a plurality of factors such as false water level, load disturbance and the like, can effectively improve the response level and accuracy of a generator set when the generator set is used for frequently adjusting the load of an automatic power generation control system of a power grid AGC, and enhances the safety and real-time accuracy of the generator set in various, the working deviation of the water supply system is avoided.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for changing a full-frequency-conversion electric feed water pump system by a steam feed water pump system is characterized in that the steam feed water pump system comprises a small steam turbine, a steam feed water pump control system DEH, a feed water pump, a front pump motor and a front pump, wherein the feed water pump, the front pump motor and the front pump are jointly used as a rotating hardware structure of a changed full-frequency-conversion electric feed water pump system, and the changing method comprises the following steps:
dismantling a small steam turbine and a steam feed pump control system DEH in the steam feed pump system;
a driving motor and a speed-up gear box which are connected with each other are arranged at the position of the original small steam turbine, the speed-up gear box is in mechanical transmission connection with the feed pump, and the driving motor is connected with a signal and electric power output device in a modified brand-new logic control system through a high-voltage frequency converter;
the pre-pump motor and the pre-pump are connected in an original mechanical transmission mode, the pre-pump is connected with the water feeding pump in a pipeline connection mode, and the pre-pump motor is connected with a signal and power output device in a modified brand-new logic control system.
2. The utility model provides a full frequency conversion electronic feed water pump system that steam feed water pump system repacked into, this parameter and the signal of having reserved receiving electric wire netting AGC automatic generation control system, DCS distributed control system and boiler control system to and three independent pressure sensor of group, flow sensor and the temperature sensor that increase on big turbine owner supplies the steam pipe, its characterized in that still includes:
the steam-driven feed water pump system is characterized in that a main steam supply pipeline of the large steam turbine is respectively provided with three groups of independent pressure sensors, flow sensors and temperature sensors, a signal and power output device in a brand-new logic control system is connected with a high-voltage frequency converter, the high-voltage frequency converter is connected with a feed water pump sequentially through a driving motor and a speed-increasing gear box, the feed water pump is sequentially connected with a front pump and a front pump motor through pipelines, the front pump and the front pump motor are in mechanical transmission connection, and the front pump motor is connected with the signal and power output device in the brand-new logic control system.
3. A new logic control method for a full frequency conversion electric feed water pump system, which retains parameters and signals of an automatic generation control system of a receiving power grid AGC, a boiler control system and a DCS distributed control system, and further comprising the full frequency conversion electric feed water pump system modified from the steam feed water pump system according to claim 2, the method comprising:
acquiring real-time pressure values monitored by each group of pressure sensors, real-time flow values monitored by the flow sensors and real-time temperature values monitored by the temperature sensors, and generating three groups of real-time operation values;
acquiring an AGC real-time instruction value sent by the power grid AGC automatic generation control system and a boiler real-time operation parameter sent by the boiler control system, wherein the AGC real-time instruction value comprises a large turbine rotating speed instruction value and a large turbine load instruction value, and a total steam quantity set value is arranged in a main steam supply pipeline of a large turbine corresponding to the boiler real-time operation parameter;
confirming a group of comparison operation values according to the three groups of real-time operation values, sequentially comparing the comparison operation values with a plurality of operation values on a preset operation value list, and confirming that the operation value with the minimum or equal difference value with the comparison operation values is the actual operation value of the boiler, wherein the operation value is a fixed factory-leaving set value generated by each device according to the use characteristics and specific use parameter values of the device during production and processing;
acquiring a target total steam set value according to the actual operation value of the boiler, the rotating speed instruction value of the large steam turbine under the AGC real-time instruction, the load instruction value of the large steam turbine under the AGC real-time instruction and the current steam quantity value in the main steam supply pipeline under the AGC real-time instruction;
acquiring the steam total difference with the AGC instruction according to the target steam total set value in the main steam supply pipeline and the actual steam total value in the main steam supply pipeline under the AGC real-time instruction;
acquiring a target total steam amount actual value required by the next step according to the boiler real-time operation parameter, the large steam turbine load instruction value, the total steam amount difference and the target total steam amount set value;
and generating and converting a deceleration instruction or an acceleration instruction of a water supply pump system regulation high-voltage frequency converter according to the actual value of the target total steam amount required in the next step, and transmitting the deceleration instruction or the acceleration instruction to the water supply pump.
4. The fully new logic control method for the fully variable frequency electric water feeding pump system according to claim 3, wherein the specific step of obtaining the set value of the total amount of target steam according to the real-time operation value of the boiler, the instruction value of the rotating speed of the large steam turbine under the real-time AGC command, the instruction value of the load of the large steam turbine under the real-time AGC command and the current steam amount value in the main steam supply pipeline under the real-time AGC command comprises:
acquiring an actual rotating speed value of the large steam turbine according to a current steam quantity value in a main steam supply pipeline of the large steam turbine;
acquiring a regulating stage pressure set value of a main steam supply pipeline of the large steam turbine and a reheater outlet pressure set value according to the large steam turbine rotating speed instruction value under the AGC real-time instruction and the actual rotating speed value of the large steam turbine under the AGC real-time instruction;
acquiring a total steam set value in a main steam supply pipeline of the large steam turbine according to the large steam turbine load instruction value under the AGC real-time instruction;
acquiring a deviation value between the total steam quantity set value and the current steam quantity value in the main steam supply pipeline;
acquiring a target steam total amount set value according to the regulating stage pressure set value, the reheater outlet pressure set value and the deviation value, wherein the target steam total amount set value is represented by a formula PS (K)RP1Determining a + Δ P, where PS is the target steam total setting, KRSet point of reheater outlet pressure at hundred percent load, P1The pressure of the regulating stage of the large steam turbine is set, and the delta P is the deviation value.
5. The completely new logic control method of the fully variable frequency electric water pump system as claimed in claim 4, wherein the specific step of obtaining the difference between the total steam quantity set value in the main steam supply pipeline and the actual steam quantity value in the main steam supply pipeline under the real-time AGC command comprises:
acquiring an actual value of the total steam quantity in the main steam pipeline according to the set value of the regulation stage pressure and the value of the primary steam extraction pressure, wherein the actual value of the total steam quantity is obtained by a formula
Is determined, wherein D isActual value of said total amount of steam in said main steam line, P1Is the set value of the pressure of the regulating stage, P, of the large steam turbine2The first-stage extraction pressure value is set, and a and b are set values;
obtaining the steam total amount difference according to the target steam total amount set value and the steam total amount actual value, wherein the steam total amount difference is obtained by a formula
And determining, wherein Y is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value, PS is the target total steam quantity set value, and D is the actual total steam quantity value in the main steam pipeline.
6. The completely new logic control method of the full frequency conversion electric feed-water pump system according to claim 5, wherein the specific step of obtaining the actual value of the total amount of the target steam required for the next step according to the real-time operation parameter of the boiler, the load instruction value of the large steam turbine, the difference of the total amount of the steam and the set value of the total amount of the target steam comprises:
acquiring a comprehensive load instruction value of the boiler according to the real-time operating parameters of the boiler and the load instruction value of the large steam turbine;
carrying out nonlinear processing on the boiler comprehensive load instruction value, adding the processed value, namely the steam total amount value generated by the boiler in real time, and the steam total amount difference to obtain the sum of the two values as a target steam total amount actual value, wherein the target steam total amount actual value is represented by a formula
Determining, wherein W is the actual value of the target total steam quantity, and H is the value of the total steam quantity generated by the boiler in real time, namely, the comprehensive load instruction value of the boiler is subjected to a nonlinear function f1(x) And Y is the value which must be met in the main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction valueThe difference of the total amount of steam.
7. The completely new logic control method of the full-frequency conversion electric water feeding pump system according to claim 6, wherein the specific steps of generating and converting the actual value of the target total steam amount required by the next step into a deceleration instruction or an acceleration instruction of the water feeding pump system regulating and controlling the high-voltage frequency converter and transmitting the deceleration instruction or the acceleration instruction to the water feeding pump comprise:
acquiring a list corresponding to the maximum steam supply quantity of each Hertz working frequency preset by the high-voltage frequency converter;
acquiring list data corresponding to each Hz under the corresponding working frequency in the list according to the model and the frequency requirement of the high-voltage frequency converter, wherein the working frequency of the high-voltage frequency converter is set to 50Hz, and acquiring the actual list data of the steam supply amount corresponding to each Hz under the working frequency of 50 Hz;
acquiring a maximum use value of the total steam volume of the large steam turbine under the maximum work;
generating and converting a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage frequency converter according to the actual list data, the maximum total steam amount utilization value and the actual target steam amount value, wherein the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage frequency converter, and the target working frequency value is represented by a formula
Wherein G is the target working frequency value, W is the target steam total actual value, E is the maximum use value of the total steam amount, and S is the actual list data;
the high-voltage frequency converter controls a driving motor of the feed pump, and the feed pump is driven to rotate according to the rotating speed received by the high-voltage frequency converter under the target working frequency through the speed-up gear box.
8. A logic control system for a full-variable frequency electric feedwater pump system which retains the parameters and signals received from the system including the grid AGC automatic generation control system, the boiler control system and the DCS distributed control system, further comprising the full-variable frequency electric feedwater pump system retrofitted to the steam-operated feedwater pump system of claim 2, said logic control system comprising:
the signal acquisition device is used for acquiring real-time pressure values monitored by each group of pressure sensors, real-time flow values monitored by the flow sensors and real-time temperature values monitored by the temperature sensors and generating three groups of real-time operation values;
the system comprises a first signal acquisition device, a second signal acquisition device and a control device, wherein the first signal acquisition device is used for acquiring an AGC real-time instruction value sent by the power grid AGC automatic generation control system and a boiler real-time operation parameter sent by the boiler control system, the AGC real-time instruction value comprises a large turbine rotating speed instruction value and a large turbine load instruction value, and a steam total amount set value is arranged in a large turbine main steam supply pipeline corresponding to the boiler real-time operation parameter;
the signal analysis device is used for confirming a group of comparison operation values according to the three groups of real-time operation values, sequentially comparing the comparison operation values with a plurality of operation values on a preset operation value list, and confirming that the operation value with the minimum or equivalent difference value with the comparison operation values is the actual operation value of the boiler, wherein the operation value is a fixed factory-leaving set value generated by each device according to the use characteristics and specific use parameter values of the device during production and processing;
the first signal calculation device is used for acquiring a target total steam quantity set value according to the actual operation value of the boiler, the rotating speed instruction value of the large steam turbine under the AGC real-time instruction, the load instruction value of the large steam turbine under the AGC real-time instruction and the current steam quantity value in the main steam supply pipeline under the AGC real-time instruction;
the second signal calculation device is used for acquiring the steam total difference with the steam total under the AGC instruction according to the target steam total set value in the main steam supply pipeline and the actual steam total value in the main steam supply pipeline under the AGC real-time instruction;
the third signal calculation device is used for acquiring a target total steam amount actual value required by the next step according to the boiler real-time operation parameter, the large steam turbine load instruction value, the total steam amount difference and the target total steam amount set value;
and the signal and power output device is used for generating and converting the actual value of the target total steam amount required by the next step into a deceleration instruction or an acceleration instruction of the water supply pump system regulating and controlling the high-voltage frequency converter and transmitting the deceleration instruction or the acceleration instruction to the water supply pump.
9. The logic control system of a full-conversion electric feedwater pump system of claim 8, wherein said first signal calculation means comprises:
the second signal acquisition module is used for acquiring the actual rotating speed value of the large steam turbine according to the current steam quantity value in the main steam supply pipeline of the large steam turbine;
the third signal acquisition module is used for acquiring a regulating stage pressure set value of a main steam supply pipeline of the large steam turbine and a reheater outlet pressure set value according to the rotating speed instruction value of the large steam turbine under the AGC real-time instruction and the actual rotating speed value of the large steam turbine under the AGC real-time instruction;
the fourth signal acquisition module is used for acquiring a total steam set value in a main steam supply pipeline of the large steam turbine according to the large steam turbine load instruction value under the AGC real-time instruction;
the fifth signal acquisition module is used for acquiring a deviation value between the total steam quantity set value and the current steam quantity value in the main steam supply pipeline;
a fourth signal calculation module, configured to obtain a target total steam amount set value according to the regulation-stage pressure set value, the reheater outlet pressure set value, and the deviation value, where the target total steam amount set value is represented by a formula PS ═ KRP1Determining a + Δ P, where PS is the target steam total setting, KRSet point of reheater outlet pressure at hundred percent load, P1Is the set value of the pressure of the regulating stage of the large steam turbine, and DeltaP is the deviationThe value is obtained.
10. The logic control system for a full-conversion electric feedwater pump system of claim 9, wherein said second signal calculation means comprises:
a fifth signal calculation module for obtaining the actual value of the total steam amount in the main steam pipeline according to the set value of the regulation stage pressure and the value of the first stage extraction steam pressure, wherein the actual value of the total steam amount is represented by a formula
Determining, wherein D is the actual value of the total amount of steam in the main steam pipeline, P1Is the set value of the pressure of the regulating stage, P, of the large steam turbine2The first-stage extraction pressure value is set, and a and b are set values;
a sixth signal calculating module for obtaining a steam total amount difference according to the target steam total amount set value and the steam total amount actual value, wherein the steam total amount difference is calculated by a formula
And determining, wherein Y is the total steam quantity difference which must be met in a main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value, PS is the target total steam quantity set value, and D is the actual total steam quantity value in the main steam pipeline.
11. The logic control system for a full-conversion electric feedwater pump system of claim 10, wherein said third signal calculation means comprises:
the sixth signal acquisition module is used for acquiring a comprehensive load instruction value of the boiler according to the real-time operating parameters of the boiler and the load instruction value of the large steam turbine;
a seventh signal calculation module for calculating the integrated load instruction value of the boilerPerforming nonlinear processing, adding the processed value, namely the steam total value generated by the boiler in real time, and the steam total difference to obtain the sum of the two, wherein the sum is used as a target steam total actual value which is calculated by a formula
Determining, wherein W is the actual value of the target total steam quantity, and H is the value of the total steam quantity generated by the boiler in real time, namely, the comprehensive load instruction value of the boiler is subjected to a nonlinear function f1(x) And converting, wherein Y is the total steam quantity difference which must be met in the main steam supply pipeline of the large steam turbine according to the requirement of the AGC real-time instruction value.
12. The logic control system of a full-conversion motor-driven feed water pump system according to claim 11, wherein the signal and power output means comprises:
the seventh signal acquisition module is used for acquiring a list corresponding to the maximum steam supply quantity of each Hertz working frequency preset by the high-voltage frequency converter;
the eighth signal acquisition module is used for acquiring list data corresponding to each hertz under the corresponding working frequency in the list according to the model and the frequency requirement of the high-voltage frequency converter, wherein the working frequency of the high-voltage frequency converter is set to be 50 hertz, and acquiring actual list data of steam supply amount corresponding to each hertz under the working frequency of 50 hertz of the high-voltage frequency converter;
the ninth signal acquisition module is used for acquiring the maximum use value of the total steam volume of the large steam turbine under the maximum work;
an eighth signal calculation module, configured to generate and convert a deceleration instruction or an acceleration instruction for regulating and controlling the high-voltage inverter according to the actual list data, the maximum total steam usage value, and the actual target total steam amount value, where the deceleration instruction or the acceleration instruction is a target working frequency value sent to the high-voltage inverter, and the target working frequency value is represented by a formula
Wherein G is the target working frequency value, W is the target steam total actual value, E is the maximum use value of the total steam amount, and S is the actual list data;
and the output module is used for controlling the drive motor of the feed pump by the high-voltage frequency converter, driving the feed pump to rotate at the rotating speed under the target working frequency received by the high-voltage frequency converter through the speed-increasing gear box, wherein in a structure that the front pump needs to be driven by an independent front motor, the output module further provides an operation instruction and a power supply for the front pump motor.
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